JP2001343117A - Combustion device combustion abnormality detection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent combustion abnormality of a combustion device by grasping deterioration of a combustion state in each of a hot water supply combustion unit and a heating combustion unit while reducing costs. SOLUTION: In a heating-only combustion state, a control means H performs a ventilation operation of a hot-water supply fan 1 with a backflow prevention ventilation capacity so as to prevent a heating-side combustion exhaust gas from flowing to a hot-water supply combustion section 2 side. In the backflow prevention ventilation process, the hot water supply fan 1 is configured to operate in the backflow permitting state in which the heating side combustion exhaust gas is allowed to flow toward the hot water supply combustion unit 2 at the heating side combustion exhaust gas detection timing. In the exhaust guide section B, when the hot water supply side combustion exhaust gas flows in each of the hot water supply independent combustion state and the simultaneous combustion state, and when the hot water supply fan 1 is operated in the backflow permissible state in the heating only combustion state, A combustion abnormality detection device for a combustion device, wherein a gas concentration detection means S for detecting the concentration of a specific component in the combustion exhaust gas is provided at a location where the side combustion exhaust gas flows.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water supply heat exchanger for heating supplied water and discharging hot water, a hot water supply burner for heating the hot water supply heat exchanger, and hot water supply for supplying combustion air to the hot water supply burner. A heating unit equipped with a heating fan, a heating heat exchanger for heating the circulating heat medium, a heating burner for heating the heating heat exchanger, and a heater for supplying combustion air to the heating burner A heating combustion unit having a fan, a hot water supply-side combustion exhaust gas discharge unit in the hot water supply combustion unit, and a heating-side combustion exhaust gas discharge unit in the heating combustion unit are connected to each other, and one exhaust pipe And a control means for controlling operation of the hot water supply combustion unit and the heating combustion unit,
The control means includes: the hot water supply fan in a hot water supply single combustion state in which the hot water supply combustion section is burnt alone; and the heating fan in a heating single combustion state in which the heating combustion section burns alone. In a simultaneous combustion state in which the hot water supply combustion section and the heating combustion section are simultaneously burned, the hot water supply fan and the heating fan perform a combustion ventilation process in which ventilation is performed so as to supply combustion air, In the hot-water supply alone combustion state, a heating-side backflow prevention ventilation process is performed in which the heating fan is ventilated with the backflow prevention ventilation capability so as to prevent the hot-water supply-side combustion exhaust gas from flowing to the heating combustion section. And, in the heating only combustion state, the hot water supply fan is passed with the backflow preventing ventilation capacity so as to prevent the heating side combustion exhaust gas from flowing to the hot water supply combustion section side. Combustion abnormality detection device Configured combustion apparatus to perform the hot water supply side backflow prevention ventilation process to operate.

[0002]

2. Description of the Related Art In order to facilitate the installation of a combustion device by facilitating the installation of a stack, the above-described combustion abnormality detection device for a combustion device uses a shared exhaust gas for hot water supply and exhaust gas for heating. The guide section is configured to guide one exhaust pipe, and the hot water supply fan is operated so as to supply air for combustion, and the heating fan is used as ventilation processing for preventing backflow on the heating side. The hot water supply side combustion exhaust gas is guided to the exhaust pipe by the common exhaust guide section without flowing to the heating combustion section side, and the hot water supply combustion section is burned independently. In addition to the hot water supply independent combustion state, the ventilation fan is operated so as to supply combustion air, and the hot water supply fan is ventilated with the backflow prevention ventilation capacity as ventilation processing to prevent backflow on the hot water supply side. Thus, the heating-side combustion exhaust gas is guided to the exhaust pipe by the common exhaust guide section without flowing the heating-side combustion exhaust gas to the hot-water supply combustion section side, and the heating-only combustion section is burned independently, and the hot-water supply fan Each of the heating fans and the heating fans is ventilated so as to supply combustion air, and the hot-water-supply-side combustion exhaust gas and the heating-side combustion exhaust gas are guided to the exhaust stack by the common exhaust guide section. The unit is configured to be freely switchable to a simultaneous combustion state in which the parts are burned at the same time.

[0003] Then, when exhaust gas obstruction occurs in which foreign matter or dust adheres to the exhaust stack, in the hot water supply alone combustion state, the exhaust gas from the hot water supply side is not properly exhausted, and the hot water supply fan is ventilated with appropriate performance. However, there is a shortage of combustion air, and the combustion state in the hot water supply combustion section deteriorates. In the heating only combustion state, the heating side combustion exhaust gas is not properly exhausted, and the heating fan is ventilated with an appropriate capacity. Even if it does, the air for combustion will be insufficient, and the combustion state in the heating combustion section will deteriorate. In addition, even in the simultaneous combustion state, the hot water supply side combustion exhaust gas and the heating side combustion exhaust gas are not properly exhausted, and even if the hot water supply fan and the heating fan are ventilated with appropriate capacities, the heating combustion section and the hot water supply combustion As a result, the combustion air in the section becomes insufficient, and the combustion state in the hot water supply combustion section and the heating combustion section deteriorates.

Accordingly, in the above-described combustion abnormality detection device for a combustion apparatus, in the hot water supply only combustion state, the heating only combustion state, and the simultaneous combustion state, the combustion in the hot water supply combustion section and the heating combustion section is performed. In order to improve the combustion state, it is desired to detect that the combustion state has deteriorated in each of the hot water supply combustion section and the heating combustion section. Therefore, in each of the hot water supply combustion unit and the heating combustion unit, when the combustion state deteriorates, the concentration of the unburned components in the flue gas increases. A carbon monoxide sensor as a gas concentration detecting means for detecting the concentration of the unburned component is provided for each of the hot water supply combustion unit and the heating combustion unit, and the detected concentration of the carbon monoxide sensor is equal to or higher than the set concentration. Thus, it is conceivable to detect the deterioration of the combustion state in the hot water supply combustion unit and the heating combustion unit.

In the hot water supply combustion section, the hot water supply heat exchanger is oxidized and corroded by dew condensation or the like in the hot water supply heat exchanger in order to heat the supplied water, and the inside of the hot water supply heat exchanger is blocked. There is a risk that so-called canning may occur, and when the canning occurs, even if the hot water supply fan is ventilated with an appropriate ventilation capacity, there is a shortage of combustion air,
The combustion state may be deteriorated, and in the hot water supply combustion section, the combustion state is deteriorated not only by the exhaust gas obstruction but also by canning.

[0006]

However, as described above, in the case where the gas concentration detecting means is provided for each of the hot water supply combustion section and the heating combustion section, two gas concentration detection means are required, and the cost is reduced. It leads to up.

The present invention has been made in view of this point, and an object of the present invention is to grasp the deterioration of the combustion state in each of the hot water supply combustion unit and the heating combustion unit while reducing the cost. Another object of the present invention is to provide a combustion device abnormality detection device that can prevent combustion abnormality of a combustion device.

[0008]

According to the first aspect of the present invention, there is provided a hot water supply heat exchanger for heating water to be supplied and discharging hot water, and for heating the hot water supply heat exchanger. A hot water supply burner, a hot water supply combustion section provided with a hot water supply fan for supplying combustion air to the hot water supply burner, a heating heat exchanger for heating a circulating heat medium, and heating the heating heat exchanger A heating burner, a heating combustion unit including a heating fan for supplying combustion air to the heating burner, a discharge unit of the hot water supply side combustion exhaust gas in the hot water supply combustion unit, and a heating side combustion in the heating combustion unit. Each of the exhaust gas discharge sections is connected to each other, and a common exhaust guide section to which one exhaust pipe is connected and connected, and control means for controlling operations of the hot water supply combustion section and the heating combustion section are provided. ,
The control means includes: the hot water supply fan in a hot water supply single combustion state in which the hot water supply combustion section is burnt alone; and the heating fan in a heating single combustion state in which the heating combustion section burns alone. In a simultaneous combustion state in which the hot water supply combustion section and the heating combustion section are simultaneously burned, the hot water supply fan and the heating fan perform a combustion ventilation process in which ventilation is performed so as to supply combustion air, In the hot-water supply alone combustion state, a heating-side backflow prevention ventilation process is performed in which the heating fan is ventilated with the backflow prevention ventilation capability so as to prevent the hot-water supply-side combustion exhaust gas from flowing to the heating combustion section. And, in the heating only combustion state, the hot water supply fan is passed with the backflow preventing ventilation capacity so as to prevent the heating side combustion exhaust gas from flowing to the hot water supply combustion section side. In the combustion abnormality detecting device of the combustion device configured to execute the hot water supply side backflow prevention ventilation process, the control unit may perform the hot water supply side backflow prevention ventilation process, at the heating side combustion exhaust gas detection timing, The heating-side combustion exhaust gas is configured to operate the hot-water supply fan in a backflow allowable state that allows the exhaust gas to flow to the hot-water supply combustion section side. In each of the simultaneous combustion states, the hot-water-supply-side combustion exhaust gas flows, and when the hot-water supply fan is operated in the backflow-permitted state in the heating-only combustion state, a location where the heating-side combustion exhaust gas flows. Is provided with gas concentration detecting means for detecting the concentration of a specific component in the combustion exhaust gas.

That is, in the hot water supply combustion section, in addition to the exhaust obstruction where foreign matter and dust adhere to the exhaust pipe, the supplied water is heated, so that dew condensation occurs in the hot water supply heat exchanger and the hot water supply heat exchange. There is a risk of so-called canning, in which the vessel is oxidized and corroded and the hot water supply heat exchanger is blocked, but in the heating combustion section, in order to heat the circulating heat medium,
It is considered that there is no risk of dew condensation occurring in the heating heat exchanger. Utilizing this idea, in the hot water supply independent combustion state and the simultaneous combustion state, by providing the gas concentration detection means at a location where the hot water supply side combustion exhaust gas flows, the gas concentration detection means for the hot water supply side combustion exhaust gas is provided. By performing the detection operation, deterioration of the combustion state in the hot water supply combustion section due to exhaust gas blockage and canning can be detected in the hot water supply single combustion state and the simultaneous combustion state.

Furthermore, in the ventilation process for preventing backflow on the hot water supply side in the heating-only combustion state, when the heating-side combustion exhaust gas detection timing is reached while preventing the heating-side combustion exhaust gas from flowing to the hot-water supply combustion section, the heating side exhaust gas Since the hot water supply fan can be operated in a backflow permitting state in which the combustion exhaust gas is allowed to flow to the hot water supply combustion section, the heating-side combustion exhaust gas is supplied only when the heating-side combustion exhaust gas detection timing comes. To the heating combustion side by allowing the gas concentration detection means to detect the heating-side combustion exhaust gas flowing to the hot water supply combustion section. It is possible to detect the deterioration of the combustion state in the section.

Therefore, the deterioration of the combustion state in the hot water supply combustion section can be detected in each of the hot water supply independent combustion state and the simultaneous combustion state only by installing one gas concentration detecting means. Since the deterioration of the combustion state in the combustion section can be detected in the heating only combustion state, as a result, the deterioration of the combustion state in the hot water supply combustion section and the deterioration of the combustion state in the heating combustion section are grasped. It becomes possible.

In summary, according to the first aspect of the present invention, the provision of only one gas concentration detecting means reduces the cost and increases the cost of the hot water supply combustion unit and the heating combustion unit. The deterioration of the combustion state in
It has become possible to provide an abnormality detection device for a combustion device that can prevent abnormal combustion of the combustion device.

According to the second aspect of the present invention, in the hot-water supply-side backflow prevention ventilation process, the control means sets the operation of the hot-water supply fan in the backflow-permitted state to the heating-side combustion exhaust gas detection timing. Then, the hot water supply fan is stopped for a set time.

That is, the configuration according to claim 2 specifies claim 1, and in the hot water supply side backflow prevention ventilation processing, when the heating side exhaust gas detection timing comes,
By stopping the hot water supply fan for the set time,
It is possible to realize a backflow permitting state in which the heating-side combustion exhaust gas is allowed to flow to the hot-water supply combustion section. In addition, when the hot water supply fan is operated with the backflow prevention ventilation capacity, the heating-side combustion exhaust gas flows from the exhaust portion of the heating-side combustion exhaust gas to the common exhaust guide, and then the ventilation of the hot water supply fan is started. The whole amount is guided to the exhaust pipe without being pushed by the ventilation from the hot water supply combustion unit due to the operation and flowing to the hot water supply combustion unit side,
By stopping the hot water supply fan for the set time,
The heating-side combustion exhaust gas flows from the exhaust-portion of the heating-side combustion exhaust gas to the common exhaust guide portion, but at least a part of the exhaust gas flows to the hot-water supply combustion portion side, and flows to the hot-water supply combustion portion side. The gas concentration detecting means can detect the combustion exhaust gas. When the exhaust gas is blocked, most of the heating-side combustion exhaust gas flows to the hot-water supply combustion unit side without being guided to the exhaust pipe. Rises, and by detecting an increase in the detected concentration, it is possible to detect deterioration of the combustion state in the heating combustion unit.

According to the third aspect of the present invention, in the hot water supply side backflow prevention ventilation process, the control means determines that the operation of the hot water supply fan in the backflow allowable state is based on the heating side exhaust gas detection timing. Then, the hot water supply fan is configured to be operated for ventilation for a set time at a ventilation capacity set to a capacity smaller than the backflow prevention ventilation capacity.

That is, in the hot-water supply side backflow prevention ventilation processing, when the heating-side combustion exhaust gas detection timing comes, the hot-water supply fan is operated for ventilation for a set time with the ventilation capacity set to a smaller capacity than the backflow prevention ventilation capacity. Thus, a backflow allowable state in which the heating-side combustion exhaust gas is allowed to flow to the hot-water supply combustion unit side without stopping the ventilation operation of the hot-water supply fan can be realized. Therefore, the time until the hot water supply fan is returned to the backflow prevention ventilation capacity can be reduced as compared with the case where the hot water supply fan is stopped for the set time and the backflow allowable state is realized. By increasing the time required for the hot water supply fan to return to the backflow prevention ventilation capacity, the flow state of the heating-side combustion exhaust gas during that time becomes unstable, and the heating-side combustion exhaust gas flows back to the hot-water supply combustion section. It is possible to avoid the disadvantage of doing so.

According to the fourth aspect of the present invention, the hot water supply heat exchanger for heating the supplied water and discharging the hot water, the hot water supply burner for heating the hot water supply heat exchanger, and the combustion air supplied to the hot water supply burner. A hot water supply combustion section having a hot water supply fan to be supplied,
A heating heat exchanger for heating the circulating heat medium, a heating burner for heating the heating heat exchanger, a heating combustion unit including a heating fan for supplying combustion air to the heating burner, A common exhaust guide section in which each of the discharge section of the hot-water-side combustion exhaust gas in the hot-water supply combustion section and the discharge section of the heating-side combustion exhaust gas in the heating combustion section is connected, and one exhaust pipe is connected in communication. Control means for controlling the operation of the hot water supply combustion section and the heating combustion section is provided, and the control means controls the hot water supply fan in the hot water supply single combustion state in which the hot water supply combustion section burns alone. The heating fan is used in the heating single combustion state in which the heating combustion unit is burned alone, and the hot water supply fan is used in the simultaneous combustion state in which the hot water supply combustion unit and the heating combustion unit are simultaneously burned. And performing a combustion ventilation process in which the heating fan is ventilated so as to supply combustion air, and prevents the hot water supply-side combustion exhaust gas from flowing to the heating combustion section in the hot water supply alone combustion state. The heating-side backflow-preventing ventilation process of causing the heating fan to ventilate with the backflow-preventing ventilation capacity so that the heating-side combustion exhaust gas flows to the hot-water supply combustion unit in the heating-only combustion state. In the combustion abnormality detection device for a combustion device configured to execute a hot-water supply side backflow prevention ventilation process in which the hot water supply fan is ventilated with a backflow prevention ventilation capability so as to prevent the hot water supply fan from performing, In the hot water supply side backflow prevention ventilation processing, the heating side combustion exhaust gas is prevented from flowing to the hot water supply combustion section when the ventilation state of the exhaust stack is proper. And, when the ventilation state of the exhaust stack is abnormal, the backflow prevention ventilation capacity is set as a capacity to allow the heating-side combustion exhaust gas to flow to the hot water supply combustion section side, and the hot water supply fan is In the shared exhaust guide portion configured to operate, the hot water supply side combustion exhaust gas flows in each of the hot water supply independent combustion state and the simultaneous combustion state, and
Gas concentration detecting means for detecting the concentration of a specific component in the combustion exhaust gas is provided at a location where the heating-side combustion exhaust gas flowing to the hot water supply combustion section in the heating-only combustion state flows.

That is, in the hot water supply combustion section, in addition to the exhaust obstruction where foreign matters and dust adhere to the exhaust pipe, the supplied water is heated, so that dew condensation occurs in the hot water supply heat exchanger and the hot water supply heat exchange occurs. There is a risk of so-called canning, in which the vessel is oxidized and corroded and the hot water supply heat exchanger is blocked, but in the heating combustion section, in order to heat the circulating heat medium,
It is considered that there is no risk of dew condensation occurring in the heating heat exchanger. Utilizing this idea, in the hot water supply independent combustion state and the simultaneous combustion state, by providing the gas concentration detection means at a location where the hot water supply side combustion exhaust gas flows, the gas concentration detection means for the hot water supply side combustion exhaust gas is provided. By performing the detection operation, deterioration of the combustion state in the hot water supply combustion section due to exhaust gas blockage and canning can be detected in the hot water supply single combustion state and the simultaneous combustion state.

In the ventilation process for preventing backflow on the hot water supply side in the heating-only combustion state, when the ventilation state of the exhaust pipe is in an appropriate state, that is, when the exhaust blockage does not occur,
Heating-side combustion exhaust gas is prevented from flowing to the hot-water supply combustion section, and when the ventilation state of the exhaust stack is abnormal, that is, when exhaust blockage occurs, heating-side combustion exhaust gas flows to the hot-water supply combustion section. The hot water supply fan can be ventilated with the ability to allow the gas concentration to be detected, so that the gas concentration detection means detects the heating-side combustion exhaust gas flowing to the hot water supply combustion section only when the exhaust gas is blocked. This makes it possible to detect the deterioration of the combustion state in the heating combustion section caused by the exhaust gas blockage.

Therefore, it is possible to detect the deterioration of the combustion state in the hot water supply combustion section in each of the hot water supply independent combustion state and the simultaneous combustion state only by installing one gas concentration detecting means, and furthermore, it is possible to detect the deterioration of the heating state. Since the deterioration of the combustion state in the combustion section can be detected in the heating only combustion state, as a result, the deterioration of the combustion state in the hot water supply combustion section and the deterioration of the combustion state in the heating combustion section are grasped. It becomes possible.

[0021] Furthermore, the heating-side combustion exhaust gas is allowed to flow to the hot-water supply combustion section only when the exhaust gas is blocked while preventing the heating-side combustion exhaust gas from flowing to the hot-water supply combustion section. Therefore, in the heating-only combustion state, it becomes possible to reduce the flow rate of the heating-side combustion exhaust gas flowing to the hot-water supply combustion unit side to a small amount,
The heating-side combustion exhaust gas flows in a large amount to the hot-water supply combustion section, so that the heating-side combustion exhaust gas flows back through the hot-water supply combustion section and the hot-water supply fan, and the back-flowing heating-side combustion exhaust gas is sucked by the heating fan. It is possible to avoid the occurrence of a self-toxic state.

By the way, if you become self-toxic,
The heating-side combustion exhaust gas to be exhausted is supplied to the heating burner as combustion air, so that the combustion state of the heating burner deteriorates, or the hot water supply combustion unit and the heating combustion unit are provided in the casing. In such a case, the heating-side combustion exhaust gas flows in the vicinity of a control unit or the like provided in the casing, and disadvantages such as a possibility that the control unit or the like may dew may occur.

As described above, according to the fourth aspect of the present invention, only by installing one gas concentration detecting means, the combustion state in the hot water supply combustion section due to exhaust gas blockage or canning is deteriorated, and It becomes possible to grasp the deterioration of the combustion state in the heating combustion section due to the exhaust gas blockage, and it is also possible to avoid the occurrence of a self-toxic state. It is possible to provide a combustion device abnormality detection device that can grasp the deterioration of the combustion state in each of the combustion unit and the heating combustion unit and prevent the combustion abnormality of the combustion device.

According to the fifth aspect of the present invention, the control means increases or decreases the amount of combustion air in accordance with a change in the target combustion amount in the combustion ventilation process in the single heating combustion state. In the hot water supply side backflow prevention ventilation process, the backflow prevention ventilation is configured to be increased or decreased in accordance with a change in the ventilation capability of the heating fan. The capacity is set and the hot water supply fan is operated.

That is, in the ventilation process for combustion in the heating only combustion state, if the ventilation capacity of the heating fan is changed in accordance with the change in the target combustion amount, the ventilation capacity for backflow prevention is increased or decreased in accordance with the change. So that the fan for hot water supply can be ventilated,
The ventilation capacity of the heating fan can be changed within a certain range, and the ventilation capacity of the backflow prevention is changed within a certain range with the change of the ventilation capacity of the heating fan. Therefore, in each of the ventilation capacity of the heating fan to be changed, when the exhaust blockage does not occur, the heating-side combustion exhaust gas is prevented from flowing to the hot water supply combustion unit side, and when the exhaust blockage occurs. In addition, the ability to allow the heating-side combustion exhaust gas to flow to the hot-water supply combustion section can be accurately set, and the hot-water supply fan can be operated to ventilate.

[0026]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An example in which a combustion abnormality detecting device of a combustion device according to the present invention is applied to a hot water supply device will be described with reference to the drawings. [First Embodiment] As shown in FIGS. 1 and 2, a hot water supply apparatus includes a hot water supply combustion section 2 having a hot water supply fan 1, a heating combustion section 4 having a heating fan 3, and a hot water supply combustion section. 2 and a control unit H as control means for controlling the operation of the heating combustion unit 4, a remote control operation unit R for instructing the control unit H to issue a control command, and the like. The hot water supply combustion unit 2 and the heating combustion unit 4 Are provided in the casing T in a state of being lined up in the lateral direction. The hot water supply device supplies hot water to a common hot water tap 5 such as a curan or a shower and fills a bathtub 6 with a heating device such as a floor heating device, a bathroom heating device, a dishwasher, and a fan convector. D is circulated and supplied.

The hot water supply combustion section 2 and the heating combustion section 4
An air supply cylinder W for supplying combustion air supplied to each of the above to the casing T is connected to an upper portion of the casing T, and the combustion air supplied to the hot water supply combustion unit 2 by the driving of the hot water supply fan 1 is provided. The air is supplied through the air supply cylinder W, and the combustion air supplied to the heating combustion unit 4 by the driving of the heating fan 3 is supplied through the air supply cylinder W.

One exhaust pipe G for exhausting combustion exhaust gas from each of the hot water supply combustion section 2 and the heating combustion section 4 to the outside of the casing T is connected to the upper portion of the casing T. A common exhaust guide section B is provided, in which the hot water supply side exhaust gas discharge section 2a and the heating side exhaust gas exhaust section 4a in the heating combustion section 4 are connected to each other and one exhaust pipe is connected to each other. ing.

That is, the discharge section 2a of the hot water supply side combustion exhaust gas
And a heating-side flue gas discharge portion 4a is provided so as to discharge flue gas upward, and the flue gas discharged upward flows into the common exhaust guide portion B, and the combustion The exhaust gas is guided by the common exhaust guide section B toward the exhaust pipe G and is exhausted. Further, as shown in the horizontal cross-sectional view in a top view of FIG. 3 and the vertical cross-sectional view in a front view of FIG. G, and a heating-side combustion exhaust gas from the heating-side combustion exhaust gas discharge portion 4a to the exhaust pipe G.
Plate V partitioned into heating side exhaust guide B2 that guides
Is provided, and the common exhaust guide B is divided into a hot water supply exhaust guide B1 and a heating exhaust guide B2 by the partition plate V.

Incidentally, in the installed state, the partition plate V is formed so as to have a part protruding upward, and the protruding portion is configured to enter the inside of the exhaust pipe G. The hot water supply side exhaust gas is prevented from flowing to the heating combustion section 4 side, and the heating side combustion exhaust gas is prevented from flowing to the hot water supply combustion section 2 side.

In the common exhaust guide B, the hot water supply single combustion state in which the hot water supply combustion section 2 is burned alone and the simultaneous combustion state in which the hot water supply combustion section 2 and the heating combustion section 4 are simultaneously burned. In the heating-only combustion state in which the hot-water-supply-side combustion exhaust gas flows and the heating-only combustion section 4 alone burns, the gas-concentration detecting means A carbon monoxide sensor S is provided.

The carbon monoxide sensor S will be specifically described. As shown in FIG. 5, the carbon monoxide sensor S detects a sensor element S3, a temperature compensation reference element S4, and an ambient temperature of the carbon monoxide sensor S on a pedestal S2 inside a protective frame S1 made of stainless steel. The temperature sensor S5 is provided. The sensor element S3 and the reference element for temperature compensation S4 are each formed of a platinum wire carrying a catalyst. Then, as shown in FIG. 6, the sensor element S3, the temperature compensation reference element S4, and the resistance elements S6 and S7 are connected in a bridge circuit state. The connector section S8 is connected to the control section H via a lead wire. That is, the sensor element S3 and the temperature-compensating reference element S4 are heated to the detection set temperature (about 200 ° C.) by the flow of current, and the unburned components that come into contact with their surfaces are burned by the catalytic action. At this time, since the catalyst carried by the sensor element S3 has selectivity to carbon monoxide gas, a difference occurs between the sensor element S3 and the temperature compensation reference element S4. Since the resistance value of the platinum wire changes depending on the temperature, the difference between the resistance values of the sensor element S3 and the temperature compensation reference element S4 increases as the concentration of carbon monoxide in the heat-exchanged combustion exhaust gas increases. Therefore, in the bridge circuit, the output value Vs as a voltage value from the connection between the sensor element S3 and the reference S4 for temperature compensation and the connection between the resistance elements S6 and S7 indicates that the monoxide in the heat-exchanged combustion exhaust gas has A value corresponding to the carbon concentration is output to detect the carbon monoxide gas concentration. However, the output value is corrected according to the ambient temperature detected by the temperature sensor S5 to calculate the carbon monoxide concentration.

The hot water supply combustion unit 2 includes, in addition to the hot water supply fan 1, a hot water supply heat exchanger 7 and a supplementary heat exchanger 8 for heating the supplied water and discharging the hot water, and the heat exchangers 7 and 8. It is composed of a gas-fired hot water supply burner 9 to be heated. A water supply passage 10 connected to a water pipe for general household is connected to the inlet side of the hot water supply heat exchanger 7, and the heated hot water is supplied to the hot water tap 5 at the outlet side of the hot water supply heat exchanger 7. The connected hot water supply path 11 is connected.

In the water supply passage 10, water from the water supply passage 10 bypasses the water filter 12, the accumulator 13, the water supply thermistor 14, the water amount sensor 15, and the hot water supply heat exchanger 7 in order from the upstream side. A bypass path 16 and the like for supplying the air to the vehicle are provided. The hot water supply path 11 has, in order from the upstream side, a hot water supply thermistor 17, a mixing valve 18 for adjusting a mixing ratio of hot water from the hot water supply heat exchanger 7 and water from the bypass path 16, and a mixing thermistor 1.
9, a water proportional valve 20, an interruption water amount sensor 21, an overpressure prevention device 22, and the like are provided.

A bath return path 23 is connected to the inlet side of the supplementary heat exchanger 8, a bath going path 24 is connected to an exit side of the supplementary heat exchanger 8, and the bath return path 23 and the hot water supply path 11 are connected. A hot water path 25 is provided to communicate with. The bath return path 23 and the bath going path 24 are connected to the bath tub 6 via a bath adapter 26, and the bath return path 23 and the bath going path 24 fill the bath tub 6 or add hot water to the bath tub 6. It is configured to fire.

In the bath return path 23, in order from the bathtub 6 side, a pressure type water level sensor 27 for detecting the level of hot and cold water in the bathtub 6, a return thermistor 28, a two-way valve 29, a solenoid valve 30 for air replacement, A circulation pump 31 for additional heating and a water flow switch P are provided. A bath thermistor 32 is provided in the bath going path 24, and a bath filling electromagnetic valve 33 is provided in the bath filling path 25. That is, by driving the circulation pump 31 for additional heating, the hot water in the bathtub 6 is additionally heated while circulating the hot water in the bathtub 6 via the bath return path 23 and the bath going path 24. I have.

The hot water supply burner 9 for heating the hot water supply heat exchanger 7 and the additional heating heat exchanger 8 is a multistage burner, and a gas supply path 34 for supplying fuel gas for general household is branched into three systems. And a gas switching electromagnetic valve 35 is provided in each gas supply path 34, and an electromagnetic hot water supply for adjusting a fuel gas supply amount to the hot water supply burner 9 is provided in the gas supply path 34 upstream of the branch point. A gas proportional valve 36, an intermittent valve 37 for intermittently supplying fuel gas, and the like are provided. Near the hot water supply burner 9, there are provided a hot water supply igniter 38 for performing an ignition operation for the hot water supply burner 9, a hot water supply frame rod 39 for detecting whether or not the hot water supply burner 9 is ignited, and the like. Have been.

The heating combustion section 4 includes a heating heat exchanger 40, a gas combustion type heating burner 41 for heating the heating heat exchanger 40, and the like, in addition to the heating fan 3. A heating medium passage 43 that connects the outlet side of the makeup water tank 42 and the inlet side of the heating heat exchanger 40 is connected to the inlet side of the heating heat exchanger 40, and the outlet side of the heating heat exchanger 40 is , A high-temperature going path 44 is connected. A heating medium return path 45 is connected to the inlet side of the makeup water tank 42, and a bypass path 46 through which the heating medium from the heating medium return path 45 bypasses the heating heat exchanger 40 is connected to the high-temperature outgoing path 44. It is connected. In the heat medium passage 43, the heat medium circulation pump 4 is provided.
The heat medium passage 43 on the heating heat exchanger 40 side of the heat medium circulation pump 47 is branched and connected to the low-temperature going path 48.

That is, by driving the circulation pump 47 for the heat medium, the high-temperature thermistor 49 provided in the high-temperature path 44, the low-temperature thermistor 50 provided in the low-temperature path 48, and the heat medium return path 45 are provided. Based on the detection information of the heat medium return thermistor 51 and the like, the water supplied from the water supply channel 10 to the makeup water tank 42 via the tank water supply channel 52 is heated by the heating heat exchanger 40,
It is supplied to the high-temperature type heating terminal D via the header HD connected to the high-temperature outgoing path 44, or bypasses the heating heat exchanger 40, and passes through the low-temperature outgoing path 48 and the low-temperature outgoing path 48. Is supplied to a low-temperature type heating terminal D via a header HD connected to the heater HD. The hot and cold water from the high-temperature and low-temperature heating terminals D is returned to the makeup water tank 42 via the header HD and the heat medium return path 45 connected to the header HD.

The tank water supply path 52 is provided with a makeup water valve 53 and a makeup water solenoid valve 54.
2, an upper limit sensor 55 for detecting the upper limit of the water level and a lower limit sensor 56 for detecting the lower limit are provided, and an overflow path 57 is connected. Further, a gas supply path 34 for supplying the fuel gas is branched from between the intermittent valve 37 and the hot water supply gas proportional valve 36 to supply the fuel gas to the heating burner 41 that heats the heating heat exchanger 40. A heating electromagnetic valve 58 for intermittently supplying fuel gas to the heating burner 41 is provided in the branched gas supply path 34.
A heating gas proportional valve 59 for adjusting the amount of fuel gas supplied to the heating burner 41 is provided. Near the heating burner 41, a heating igniter 60 for performing an ignition operation for the heating burner 41, a heating frame rod 61 for detecting whether or not the heating burner 41 is ignited, and the like are provided. Have been.

Based on the control command from the remote controller R, the control section H performs a hot water supply single combustion state in which the hot water supply combustion section 2 burns alone, a heating single combustion state in which the heating combustion section 4 burns alone, And a hot water supply combustion unit 2 and a heating combustion unit 4
Are simultaneously switchable to three combustion states, that is, a simultaneous combustion state in which the combustion is performed simultaneously. That is, the ventilation operation is performed such that the hot water supply fan 1 is supplied in the hot water supply only combustion state, the heating fan 3 is supplied in the heating only combustion state, and the hot water supply fan 1 and the heating fan 3 are supplied in the simultaneous combustion state so as to supply combustion air. It is configured to execute a combustion ventilation process to be performed. When the hot-water supply burner 9 is misfired during the combustion ventilation process, the hot-water supply fan 1 is ventilated with the retry ventilation capacity to re-ignite the hot-water supply burner 9, and the heating burner is operated. When the misfire state of the heating burner 41 occurs, a retry ventilation process is performed in which the heating fan 3 is ventilated with the retry ventilation capacity in order to re-ignite the heating burner 41.

Hereinafter, each of the hot water supply single combustion state, the heating single combustion state, and the simultaneous combustion state will be described. First, in the hot-water supply independent combustion state, the operation of the hot-water supply combustion unit 2 is controlled by performing a ventilation process for combustion and changing and controlling the ventilation capacity of the hot-water supply fan 1 in accordance with the target combustion amount for hot water supply. The combustion exhaust gas from the hot water supply side
It is configured to execute a heating-side backflow prevention ventilation process in which the heating fan 3 is ventilated with the backflow prevention ventilation capacity so as to prevent the heating fan 3 from flowing to the side. Although not shown, the relationship between the target hot water supply combustion amount and the target rotation speed of the hot water supply fan 1 for realizing combustion at the target hot water supply combustion amount is set in advance as a hot water supply fan control line (FIG. 8), the ventilation capacity of the hot-water supply fan 1 is changed and controlled on the hot-water supply fan control line so as to increase or decrease the ventilation amount of the combustion air in accordance with the change of the hot-water supply target combustion amount.

Then, the carbon monoxide sensor S is caused to detect the hot water supply side combustion exhaust gas flowing from the hot water supply combustion section 2 to the exhaust stack G through the hot water supply side exhaust guide section B1 so that the carbon monoxide is detected. When the carbon monoxide gas concentration detected by the sensor S becomes equal to or higher than the set concentration, the deterioration of the combustion state in the hot water supply combustion unit 2 is detected, and the combustion of the hot water supply burner 9 is stopped. It is configured to execute processing such as displaying an error or issuing a warning.

Next, in the heating-only combustion state, the operation of the heating combustion section 4 is controlled by controlling the ventilation capacity of the heating fan 3 by executing the ventilation process for combustion, and the heating-side combustion exhaust gas is also controlled. The hot-water supply fan 1 is configured to perform a hot-water supply side backflow prevention ventilation process in which the hot-water supply fan 1 is ventilated with the backflow prevention ventilation capacity so as to prevent the water from flowing to the hot-water supply combustion unit 2 side. In the hot water supply side backflow prevention ventilation processing, when the ventilation state of the exhaust pipe G is in an appropriate state, the heating side exhaust gas is prevented from flowing to the hot water supply combustion section 2 side, and the exhaust state of the exhaust pipe G is prevented. Is abnormal, a backflow prevention ventilation capacity is set as a capacity to allow the heating-side combustion exhaust gas to flow to the hot-water supply combustion unit 2 side, and the hot-water supply fan 1 is operated.

In addition, the backflow prevention ventilation capacity of the hot water supply fan 1 in the hot water supply side backflow prevention ventilation processing is such that foreign matter or dust adheres to the exhaust pipe G so that the exhaust blockage does not occur. In this case, the heating-side combustion exhaust gas from the heating combustion section 4 is pushed by the ventilation air from the hot-water supply combustion section 2 and does not flow back to the hot-water supply combustion section 2, and exhaust blockage occurs. 7, the heating-side combustion exhaust gas from the heating combustion section 4 allows the ventilation air from the hot-water supply combustion section 2 to return to flow back to the hot-water supply combustion section 2 as shown in FIG. Ability is set to such.

More specifically, as shown in FIG.
The relationship between the heating target combustion amount and the target rotation speed of the heating fan 3 for realizing combustion at the heating target combustion amount is set in advance as a heating fan control line L1. The relationship between the amount and the target rotation speed of the hot-water supply fan 1 is preset as a hot-water supply fan idling fan control line L2. Then, in the ventilation process for combustion, the ventilation capacity of the heating fan 3 is changed and controlled on the heating fan control line L1 so as to increase or decrease the ventilation amount of the combustion air in accordance with the change in the target combustion amount for heating. In the hot water supply side backflow prevention ventilation processing, the backflow prevention ventilation capacity is set in such a manner as to be increased or decreased on the hot water supply fan idling fan control line L2 in accordance with a change in the ventilation capacity of the heating fan 3, The hot water supply fan 1 is configured to operate.

In the hot water supply side backflow prevention ventilation process,
As shown in FIG. 7, when exhaust gas obstruction occurs in which foreign matter or dust adheres to the exhaust stack G and obstructs the exhaust gas, the heating-side combustion exhaust gas is allowed to flow to the hot-water supply combustion unit 2 side.
By causing the carbon monoxide gas sensor S to detect the heating-side combustion exhaust gas flowing to the hot water supply combustion unit 2 side, the carbon monoxide gas concentration detected by the carbon monoxide sensor S becomes equal to or higher than the set concentration. Then, the deterioration of the combustion state in the heating combustion unit 4 is detected, the combustion of the heating burner 41 is stopped, and an error is displayed on the remote control operation unit R or the like,
It is configured to execute processing such as alarming.
In addition, Q in the figure schematically shows a state in which foreign matter or dust adheres to the exhaust pipe G and is blocked.

In the heating independent combustion state, by performing the above-described hot water supply side backflow prevention ventilation processing, the deterioration of the combustion state of the heating combustion unit 4 by the carbon monoxide sensor S disposed at the above-described location is reduced. About what can be detected, FIG.
A description will be given based on a graph showing the experimental results. That is, what is shown in FIG. 9 is a case where the target combustion amount for heating is the maximum (heating MAX in the figure) and a minimum (the heating mi in the figure).
n), in the intermediate case between the maximum and the minimum (in the figure, the heating intermediate region), the blockage rate of the exhaust pipe G and the above-mentioned blockage when the above-described hot water supply side backflow prevention ventilation processing is executed. 7 is a graph showing a relationship with a CO concentration detected by a carbon monoxide sensor S arranged at the position of FIG.

According to the graph of FIG. 9, regardless of the target combustion amount for heating, when the closing rate of the exhaust stack G is low, C
When the O concentration is low and the closing rate of the exhaust stack G exceeds 93%,
Since it can be seen that the CO concentration increases rapidly, the exhaust stack G
When the ventilation state is appropriate, the CO concentration detected by the carbon monoxide sensor S becomes a low value, and when the ventilation state of the exhaust stack G becomes abnormal, the CO concentration detected by the carbon monoxide sensor S becomes low.
It can be said that the O concentration becomes a high value. And the exhaust stack G
When the ventilation state of the air supply becomes abnormal, that is, when the exhaust gas is blocked, the combustion state of the heating burner 41 deteriorates. By detecting whether the CO concentration detected by the sensor S is equal to or higher than the set concentration, it can be said that the deterioration of the combustion state in the heating combustion unit 4 can be detected.

Summarizing the above, by performing the above described hot water supply side backflow prevention ventilation processing, the graph shown in FIG. 9 shows that the exhaust gas is detected by the carbon monoxide sensor S in a state where the exhaust gas is not blocked. It can be seen that the CO concentration detected by the carbon monoxide sensor S becomes a high value in a state where the exhaust gas is clogged in a state where the exhaust gas is clogged. By executing, it can be said that the deterioration of the combustion state of the heating burner 41 can be detected by the carbon monoxide sensor S arranged at the above-described location.

Next, in the simultaneous combustion state, a ventilation process for combustion is executed to change and control the ventilation capacity of the hot water supply fan 1 and the ventilation capacity of the heating fan 3 so that the hot water supply combustion unit 2 and the heating The operation of the heating fan 4 is controlled, and after the start of combustion of the heating burner 41 and after performing the retry ventilation process, the heating fan 3
Is configured to perform a capacity-restricted ventilation process in which ventilation is performed with a smaller capacity than the hot-water supply fan 1. In addition, in the ventilation process for combustion, the ventilation capacity of the hot water supply fan 1 is changed and controlled so as to increase or decrease the ventilation amount of the combustion air in accordance with the change in the target combustion amount for hot water supply, and the target combustion for heating is performed. The ventilation capacity of the heating fan 3 is controlled to be changed between the maximum ventilation capacity and the minimum ventilation capacity so as to increase or decrease the ventilation amount of the combustion air in accordance with the change in the amount. After the heating burner 41 is in a misfire state during the execution of the combustion ventilation process and the retry ventilation process is performed, the heating fan 3 is operated to ventilate with the minimum ventilation capacity smaller than that of the hot water supply fan 1. It is configured as follows.

As shown in FIG. 8, the retry ventilation process in the heating combustion unit 4 is to re-ignite the heating burner 41 if the heating burner 41 is misfired during the combustion ventilation process. A retry fan control line L3 is set in advance as a relationship between the target combustion amount for heating and the target rotation speed of the heating fan 3 for retry. In the retry ventilation process, the retry fan control line L3 is used for heating on the retry fan control line L3. It is configured to control the ventilation capacity of the fan 3.

More specifically, in the combustion ventilation process, the ventilation capacity of the hot water supply fan 1 is changed and controlled, and
The ventilation capacity of the heating fan 3 is changed and controlled on the heating fan control line L1 in accordance with the change in the target combustion amount for heating, and after the start of combustion of the heating burner 41 and after the above-described retry ventilation processing is executed. , The ventilation capacity of the heating fan 3 is determined by the heating fan control line L1.
First, the heating fan 3 is caused to perform the ventilation operation with the minimum ventilation capacity. That is, when the ventilation capacity of the heating fan 3 is changed and controlled, the ventilation capacity of the heating fan 3 is changed to the heating fan control line L1.
At first, the target rotation speed of the heating fan 3 is ventilated at the minimum target rotation speed (the min point on the heating fan control line L1 in FIG. 8) so that the hot-water-supply-side combustion exhaust gas is discharged into the exhaust pipe G. Is set to be larger than the flow rate of the heating-side combustion exhaust gas flowing toward the exhaust stack G.

In addition, as shown in FIG. 10, by performing the capacity-restricted ventilation process, a larger amount of the hot water supply exhaust gas than the heating exhaust gas flows toward the exhaust stack G. If the exhaust gas is blocked due to foreign matter or dust adhering to the exhaust stack G, most of the heating-side combustion exhaust gas is not discharged from the heating combustion unit 4,
As a result, the heating burner 41 will be in a misfire state. That is, by performing the capacity-restricted ventilation processing, a large flow rate difference is generated between the hot-water-supply-side combustion exhaust gas and the heating-side combustion exhaust gas flowing toward the exhaust stack G, and exhaust blockage occurs. The heating burner 41 is set in a misfire state. In the figure, Q
Fig. 3 schematically shows a state in which foreign matter or dust adheres to the exhaust pipe G and is closed.

Then, after the capacity-limited ventilation processing is executed, the retry ventilation processing is executed, the capacity-limited ventilation processing is executed again, and the continuous misfire state in which the heating burner 41 is again in the misfire state continues for the set number of times. In accordance with the detection, it is configured to detect that the ventilation state of the exhaust pipe G is abnormal, and when it is detected that the ventilation state of the exhaust pipe G is abnormal, the hot water supply burner 9 and the heating Burner 41
Is stopped, and processing such as displaying an error on the remote control operation unit R or issuing an alarm is executed.

In addition, as described above, if the capacity restriction process is executed in a state where the exhaust gas is blocked, the heating burner 41 is in a misfire state. The respective processes are executed in the order of the capacity limiting ventilation process, the retry ventilation process, and the capability limiting ventilation process. And, in the state where the exhaust gas obstruction has occurred, even when the second performance limitation ventilation process is executed,
The heating burner 41 becomes misfired, and the heating burner 41
Are detected as a continuous misfire state in which a continuous misfire state occurs, and the continuous misfire state is set for a set number of times (for example,
(3 times) If it is detected continuously, it is configured to detect that exhaust blockage has occurred.

That is, by executing a capacity-restricted ventilation process in which the heating burner 41 is in a misfire state when the exhaust gas obstruction is occurring, the occurrence of the exhaust gas obstruction is detected as the misfiring state of the heating burner 41. The occurrence of the exhaust blockage is detected by detecting the continuous misfire state in which the misfire state is continuously detected for a predetermined number of times.

Incidentally, regarding the deterioration of the combustion state of the hot water supply combustion unit 2 in the simultaneous combustion state, the carbon monoxide sensor S is caused to detect the combustion exhaust gas on the hot water supply side, and the detected carbon monoxide gas concentration is reduced. If it is above the set concentration,
It is configured to detect deterioration of the combustion state.

As described above, by providing only one carbon monoxide sensor S, deterioration of the combustion state in the hot water supply combustion section 2 due to exhaust gas blockage or canning is detected in the hot water supply single combustion state and the simultaneous combustion state. And the deterioration of the combustion state in the heating combustion unit 4 due to the exhaust blockage.
It is possible to detect in the heating only combustion state, thereby grasping the deterioration of the combustion state in the hot water supply combustion unit 2 and the heating combustion unit 4 while reducing the cost, and preventing abnormal combustion of the combustion device. It is possible to do.

The operation of the hot water supply combustion unit 2 includes a general hot water supply process for supplying general hot water to the hot water tap 5, a hot water filling process for filling the bathtub 6, and a reheating process for additionally heating hot water in the bathtub 6. And the heating combustion unit 4
Is configured to execute a heating process of circulating and supplying hot water to the heating terminal D.

Hereinafter, each of the general hot water supply processing, hot water filling processing, additional heating processing, and heating processing will be described. More specifically, the general hot water supply process will be described. When the amount of water detected by the water amount sensor 15 becomes equal to or more than a predetermined amount due to the opening operation of the hot water tap 5, after the hot water supply fan 1 is driven, the gas switching electromagnetic valve 35 is appropriately switched. The intermittent valve 37 is opened to adjust the opening of the hot water supply gas proportional valve 36, and the hot water supply igniter 38 ignites the hot water supply burner 9. And hot water supply burner 9
Is ignited, a target hot water supply combustion amount is determined based on a target hot water supply temperature set by the remote control operation unit R, a detected water temperature by the water supply thermistor 14, a detected water amount by the water amount sensor 15, and the like. The gas switching electromagnetic valve 35 is switched so that the amount becomes equal to the opening amount of the hot water supply gas proportional valve 36, the ventilation capacity of the hot water supply fan 1 is adjusted in accordance with the target hot water supply combustion amount, and The so-called feedforward control is executed so that the opening of the mixing valve 18 is also adjusted so that the hot water supply temperature becomes the target hot water supply temperature.

In addition to the feedforward control, based on the deviation between the target hot water temperature set by the remote control operating section R and the hot water temperature detected by the hot water thermistor 17, the opening degree of the hot water gas proportional valve 36 is finely adjusted. Adjustment, so-called feedback control, is executed, and hot water at the target hot water supply temperature is supplied from the hot water tap 5. Then, when the water amount sensor 15 stops detecting a predetermined amount of water flow following the closing operation of the hot water tap 5, the intermittent valve 37 and the hot water gas proportional valve 36 are closed to stop the combustion of the hot water supply burner 9, and The hot water supply fan 1 is also stopped after a certain time has elapsed.

More specifically, the hot water filling process will be described. When the hot water filling electromagnetic valve 33 is opened, the hot water supply burner 9 is ignited and the feedforward control and the feedback control are performed in the same manner as in the above-described general hot water supply process. By executing the hot water, the hot water having the target hot water supply temperature set by the remote control operation unit R is supplied to the bathtub 6 to fill it. Then, when a predetermined amount of hot and cold water is supplied to the bathtub 6, the recirculating pump 31 is operated to close the two-way valve 29, the water level sensor 27 detects the water level in the bathtub 6, and the detected water level is set. When the water level has been reached, the hot water filling solenoid valve 33 is closed,
The intermittent valve 37 and the gas proportional valve 36 are closed and the hot water supply burner 9 is closed.
Is stopped, and the hot-water supply fan 1 is also stopped after a certain period of time.

More specifically, the reheating process will be described. When the hot water supply burner 9 is not burning, the recirculation pump 31 starts to operate, and the detection of the water flow of the water flow switch P causes the hot water supply fan to operate. After driving 1, the gas switching solenoid valve 35 is appropriately switched to open the intermittent valve 37, the opening of the gas proportional valve 36 is adjusted, and the hot water supply igniter 38 ignites the hot water supply burner 9. The hot water supply target combustion amount is determined based on the detected hot water temperature of the outgoing thermistor 32 and the like, and the gas switching solenoid valve 35 is switched to achieve the hot water supply target combustion amount. The opening degree is adjusted, the ventilation capacity of the hot water supply fan 1 is adjusted in accordance with the target hot water supply combustion amount, and the hot water in the bathtub 6 is heated by the additional heat exchanger 8. Then, return thermistor 2
When the detected hot water temperature reaches the set temperature set in the remote controller R, the hot water supply gas proportional valve 36 and the intermittent valve 37
Is closed to stop the combustion of the hot water supply burner 9, and after a certain period of time, the hot water supply fan 1 is also stopped.

More specifically, the heating process will be described. When there is a request to supply hot or cold water to the heating terminal D, for example, when the operation of the high-temperature heating terminal D is instructed, the heating medium circulation pump 47 is turned on. After driving, the intermittent valve 37 and the heating solenoid valve 58 are opened, the opening of the heating gas proportional valve 59 is adjusted, and the heating burner 41 is ignited by the heating igniter 60. Then, when the heating burner 41 is ignited,
The heating target combustion amount is determined based on the temperature of the hot and cold water required by the heating terminal D, the detected temperature of the heating return thermistor 51 and the detected temperature of the high-temperature going thermistor 49, and the heating target combustion amount is determined. In addition to adjusting the opening of the heating gas proportional valve 59 and adjusting the ventilation capacity of the heating fan 3 in accordance with the target combustion amount for heating, the temperature of the hot water supplied to the heating terminal D is required. Temperature. In this way, the heating terminal D
Is supplied to the terminal D for heating, and when there is no need to supply hot water to the terminal D for heating,
The heating gas proportional valve 59 and the intermittent valve 37 are closed to stop the combustion of the heating burner 41, and the heating fan 3 is also stopped after a predetermined time has elapsed.

Incidentally, when there is a demand for hot water supply at the low-temperature type heating terminal D, the circulation pump 47 for the heat medium is driven so that the water supplied to the make-up water tank 42 is supplied to the heating heat exchanger 40. Is supplied to the low-temperature outgoing path 48 and the low-temperature-type heating terminal D via the header HD connected to the low-temperature outgoing path 48.

[Second Embodiment] The second embodiment shows another embodiment of the ventilation process for preventing backflow on the hot water supply side in the single heating state in the first embodiment. It will be described based on the following. Since other configurations and operations are the same as those of the first embodiment, detailed description thereof will be omitted by giving the same reference numerals.

In the heating only combustion state, the operation of the heating combustion unit 4 is controlled by executing a ventilation process for combustion and changing and controlling the ventilation capacity of the heating fan 3 in accordance with the target combustion amount for heating. The hot water supply fan 1 is configured to perform a hot water supply side backflow prevention ventilation process in which the hot water supply fan 1 is ventilated with the backflow prevention ventilation capacity so as to prevent the heating-side combustion exhaust gas from flowing to the hot water supply combustion unit 2. Have been. Then, in the hot water supply side backflow prevention ventilation processing, at the heating side combustion exhaust gas detection timing, the hot water supply fan 1 is operated in a backflow allowable state in which the heating side combustion exhaust gas is allowed to flow to the hot water supply combustion unit 2 side. Is configured.

The position of the carbon monoxide sensor S is as follows.
As shown in FIGS. 3 and 4, in the shared exhaust gas guide portion B, the hot-water-supply-side combustion exhaust gas flows in each of the hot-water supply independent combustion state and the simultaneous combustion state, and flows backward through the hot-water supply fan 1 in the heating only combustion state. It is provided at a location where the flow is allowed.

More specifically, in the hot water supply side backflow prevention ventilation process, the hot water supply fan 1 is operated with the backflow prevention ventilation capacity to prevent the heating-side combustion exhaust gas from flowing to the hot water supply combustion unit 2 side. When the heating exhaust gas detection timing is reached, the operation of the hot water supply fan 1 is stopped for a set time as an operation in the backflow allowable state, and the heating exhaust gas flows to the hot water supply combustion unit 2 side. It is configured to allow that.

That is, as shown in FIG. 11, when the heating-side combustion exhaust gas detection timing comes, the hot-water supply fan 1 is stopped for a set time (for example, 60 seconds), and the heating-side combustion exhaust gas is discharged to the hot-water supply combustion section 2. When it is allowed to flow to the side, the heating-side combustion exhaust gas flows back from the hot-water supply combustion unit 2 to the hot-water supply fan 1, and further flows back from the hot-water supply fan 1 to flow into the casing T. The heating side fan 3 is configured to generate a self-toxic state in which the heating-side combustion exhaust gas is supplied as combustion air by the heating fan 3.

When the heating-side combustion exhaust gas detection timing comes, the hot-water supply fan 1 is stopped for a set time, so that when the self-poisoning state occurs, the heating-side combustion flowing to the hot-water supply combustion unit 2 side. By making the carbon monoxide sensor S detect the exhaust gas, the deterioration of the combustion state in the heating combustion unit 4 is detected based on the carbon monoxide gas concentration detected by the carbon monoxide sensor S, The combustion of the heating burner 41 is stopped, and an error is displayed on the remote controller R or an alarm is issued.

In addition, at the timing of detecting the combustion exhaust gas on the heating side, the reference output value K1 of the carbon monoxide sensor S at that time is detected, and after the hot water supply fan 1 is stopped, a set time (for example, 60 seconds) ) Is detected, the detected output value K2 of the carbon monoxide sensor S is detected, and the detected output value K2 is equal to or more than a set value, and a value Kh obtained by subtracting the reference output value K1 from the detected output value K2 is set. Value (for example, 0.
6) Above, it is configured to detect the deterioration of the combustion state.

In other words, when the hot-water supply fan 1 is stopped, a self-poisoning state occurs. If the exhaust gas is blocked in this state, a large amount of heating-side combustion exhaust gas flows to the hot-water supply combustion section 2 side. Then, the combustion state in the heating combustion unit 4 deteriorates because the fuel flows to the heating combustion unit 4 again, and the carbon monoxide gas concentration in the heating-side combustion exhaust gas flowing to the hot water supply combustion unit 2 decreases. Will rise. Then, instead of simply detecting the deterioration of the combustion state based on whether the detection output value K2 after the set time is equal to or more than the set value,
In addition, the deterioration of the combustion state in the heating combustion unit 4 is detected based on whether or not a value Kh obtained by subtracting the reference output value K1 from the detected output value K2 is equal to or greater than a set value. The value of the increase in the carbon monoxide gas concentration due to the deterioration of the combustion state in the combustion unit 4 can be accurately detected, and the deterioration of the combustion state in the heating combustion unit 4 is accurately detected.

Referring to the graph of FIG. 12, FIG.
As shown in (a) of FIG. 2, in a state where the exhaust gas is not blocked, even if the hot water supply fan 1 is stopped in accordance with the heating-side combustion exhaust gas detection timing, the carbon monoxide gas generated thereafter is generated. Does not increase, and the output value of the carbon monoxide sensor S (CO sensor output in the figure) does not increase. However, as shown in FIG. Then, when the hot water supply fan 1 is stopped at the timing of detecting the combustion exhaust gas on the heating side, the concentration of the generated carbon monoxide gas sharply increases thereafter, and the output value of the carbon monoxide sensor S (in the figure) It can be seen that the CO sensor output) also increases. Therefore, based on the deviation Kh and the reference output value K1 between the reference output value K1 of the carbon monoxide sensor S when the hot water supply fan 1 is stopped and the detection output value K2 of the carbon monoxide sensor S when a set time has elapsed therefrom. Thus, the deterioration of the combustion state can be detected.

FIG. 12A shows the rotation speed of the heating fan 3, the output value of the carbon monoxide sensor S, and the concentration of the generated carbon monoxide gas, respectively, when the exhaust gas is not blocked. (B) in FIG. 12 shows the rotation speed of the heating fan 3, the output value of the carbon monoxide sensor S, and the occurrence of the change when the exhaust gas is blocked. FIG. 3 shows changes in the carbon monoxide gas concentration with time.

A description will be given based on the experimental results shown in FIG. 13. Heating-side combustion exhaust gas detection timing (combustion in the figure)
Is not less than 600 ppm, the reference output value K1 is not less than 2.0 V and the deviation K between the detected output value K2 and the reference output value K1 even when the room temperature changes.
Since h is 0.6 or more, the deviation Kh
Is 0.6 V or more and K1 is 2.0 V or more, the judgment is made that the combustion state in the heating combustion unit 4 is degraded by making the judgment “x”. It can be seen that deterioration can be accurately detected.

FIG. 13 shows the respective concentrations (0 to 100 ppm, 100 to 200,...) Of the carbon monoxide gas concentration (column of combustion in the figure) at the heating-side combustion exhaust gas detection timing.
・ 800 to 1000 ppm, 1000 to 2000 pp
For m), an experimental result is shown in which the reference output value K1, the detected output value K1, and the value Kh obtained by subtracting the reference output value K1 from the detected output value K2 are shown. It should be noted that in the determination in the figure, the deviation Kh is 0.6 V or more and K1 is 2.0 V
If so, it is determined as x.

[Other Embodiments] (1) In the first and second embodiments, a carbon monoxide sensor is exemplified as the gas concentration detecting means. However, an oxygen sensor for detecting the oxygen gas concentration in the combustion exhaust gas, a combustion exhaust gas Various sensors such as a nitrogen oxide sensor for detecting a nitrogen oxide gas concentration in the inside are applicable.

(2) In the first embodiment, in the hot-water supply side backflow prevention ventilation processing, the airflow capacity is increased or decreased in accordance with a change in the ventilation capacity of the heating fan 3 which is changed in accordance with a change in the heating target combustion amount. Set the ventilation capacity for backflow prevention with
Although the hot-water supply fan 1 is made to perform the ventilation operation, for example, the heating target combustion amount is burned at a constant combustion amount,
In the ventilation process for combustion, the heating fan 3 is ventilated with a fixed ventilation capacity, and in the ventilation process for hot water supply side backflow prevention, the ventilation capability for backflow prevention is set to a fixed capacity, and the hot water supply fan 1 is ventilated. It is also possible to carry out in this manner.

When the ventilation capacity of the heating fan 3 is changed in accordance with the change of the target combustion amount for heating,
For example, the target combustion amount for heating is set to the large capacity range, the medium capacity range,
When the target combustion amount for heating is within the large capacity range, the ventilation capacity for backflow prevention is set to large capacity, and when the target combustion amount for heating is within the medium capacity range. When the ventilation capacity for backflow prevention is set to medium capacity and the target combustion amount for heating is within the small capacity range, the ventilation capacity for backflow prevention is set to small capacity, and the hot water supply fan 1 is operated to perform ventilation. It is also possible.

(3) In the second embodiment, the heating-side hot water supply fan 1 is stopped for a set time as the operation of the hot-water supply fan 1 in the backflow allowable state at the heating-side detection timing. Instead of this operation, the hot water supply fan 1 in the backflow allowable state at the heating side detection timing
As an operation, the hot-water supply fan 1 may be operated to ventilate for a set time with a ventilation capacity set to a smaller capacity than the backflow prevention ventilation capacity.

(4) In the first and second embodiments, the configuration in which one supply cylinder W is provided on the upper part of the casing T is exemplified. For example, the hot water supply combustion part 2 and the heating combustion part are provided on the front surface of the casing T. It is also possible to provide an air supply port for supplying combustion air to be supplied to each of the sections 4, and the method of supplying combustion air into the casing T can be appropriately changed. is there.

(5) In the first and second embodiments, the capacity-restricted ventilation processing is performed in the simultaneous combustion state. However, the processing may be performed without performing the capacity-restricted ventilation processing. .

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a water heater.

FIG. 2 is a front view of the hot water supply apparatus with the front view of the casing removed.

FIG. 3 is a top cross-sectional view of a common exhaust guide.

FIG. 4 is a vertical cross-sectional view of a main part of the hot water supply device when viewed from the front.

FIG. 5 is a schematic diagram showing the structure of a carbon monoxide sensor.

FIG. 6 is a circuit diagram of a carbon monoxide sensor.

FIG. 7 is a view showing a flow of a heating-side combustion exhaust gas in a heating-only combustion state of the first embodiment.

FIG. 8 is a diagram showing a relationship between a target combustion amount for heating and a target rotation speed of a heating fan.

FIG. 9 is an experimental data showing the relationship between the closing rate and the CO concentration when the hot water supply side backflow prevention ventilation processing in the first embodiment is executed.

FIG. 10 is a diagram showing flows of a hot water supply side combustion exhaust gas and a heating side combustion exhaust gas in the simultaneous combustion state of the first embodiment.

FIG. 11 is a diagram showing a flow of a combustion exhaust gas on a heating side in a heating independent combustion state according to a second embodiment.

FIG. 12 is an experimental data showing changes with time of a rotation speed of a heating fan, an output value of a carbon monoxide sensor, and a CO concentration when a ventilation process for hot water supply side backflow prevention according to a second embodiment is executed.

FIG. 13 is experimental data showing a determination result in the second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hot-water supply fan 2 Hot-water supply combustion part 2a Hot-water supply side combustion exhaust gas discharge part 3 Heating fan 4 Heating combustion part 4a Heating-side combustion exhaust gas discharge part 7 Hot water supply heat exchanger 9 Hot water supply burner 40 Heating heat exchanger 41 Heating Burner B Shared exhaust guide G Exhaust stack H Control means S Gas concentration detection means

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masato Doyama 1-152 Oka, Minami-shi, Minato-ku, Osaka City, Osaka Prefecture Inside Harman Co., Ltd. (72) Inventor Hirosao Iida 1-1-1, Oka, Minami-shi, Minato-ku, Osaka-shi, Osaka No. 52, Harman Co., Ltd. (72) Masayoshi Hokawa, Inventor 1-1-1 Oka, Minami-shi, Minato-ku, Osaka, Osaka Prefecture Herman (72) Inventor Hidefumi Kota 1-1-1, Oka, Minami-shi, Minato-ku, Osaka, Osaka No. 52 Harman Co., Ltd. F term (reference) 3K003 JA12 KA05 KB02 LA03 MA09 NA03 NA05 3L034 EA07

Claims (5)

[Claims] 1. A hot water supply system comprising: a hot water supply heat exchanger for heating water to be supplied to discharge hot water; a hot water supply burner for heating the hot water supply heat exchanger; and a hot water supply fan for supplying combustion air to the hot water supply burner. Heating heat exchanger for heating the circulating heat medium, a heating burner for heating the heating heat exchanger, and a heating fan with a heating fan for supplying combustion air to the heating burner A common use in which the combustion section and the discharge section of the hot water supply side combustion exhaust gas in the hot water supply combustion section and the heating side combustion exhaust gas discharge section in the heating combustion section are respectively connected and connected, and one exhaust pipe is connected and connected. An exhaust guide section and control means for controlling the operation of the hot water supply combustion section and the heating combustion section are provided, and the control means is configured to control the hot water supply in a hot water supply single combustion state in which the hot water supply combustion section burns alone. For fan The heating fan in a heating-only combustion state in which the heating combustion unit is burned alone, and the hot-water supply fan in a simultaneous combustion state in which the hot water supply combustion unit and the heating combustion unit are simultaneously burned. A combustion ventilation process is performed in which the heating fan is ventilated to supply combustion air, and the hot water supply-side combustion exhaust gas is prevented from flowing to the heating combustion section in the hot water supply alone combustion state. As described above, the heating-side backflow-preventing ventilation process for causing the heating fan to ventilate with the backflow-preventing ventilation capacity is performed, and the heating-side combustion exhaust gas flows to the hot-water supply combustion unit in the heating-only combustion state. Combustion abnormality detection of a combustion device configured to execute a hot water supply side backflow prevention ventilation process in which the hot water supply fan is ventilated by the backflow prevention ventilation capability so as to prevent the hot water supply fan from flowing. A discharge device, wherein the control means is configured to allow the heating-side combustion exhaust gas to flow to the hot-water supply combustion section at a heating-side combustion exhaust gas detection timing in the hot-water supply-side backflow prevention ventilation process. The hot-water supply fan is configured to operate in the state, and the hot-water supply-side combustion exhaust gas flows in each of the hot-water supply independent combustion state and the simultaneous combustion state in the common exhaust guide section, and the heating only. When the hot water supply fan is operated in the backflow permitting state in a combustion state, a gas concentration detection unit for detecting a concentration of a specific component in the combustion exhaust gas is provided at a location where the heating-side combustion exhaust gas flows. Device for detecting abnormal combustion in a combustion device. In the hot water supply side backflow prevention ventilation process, the control means operates the hot water supply fan for a set time at a heating side combustion exhaust gas detection timing as an operation of the hot water supply fan in the backflow allowable state. The abnormal combustion detection device for a combustion device according to claim 1, wherein the abnormality detection device is configured to stop for a while. 3. In the hot water supply side backflow prevention ventilation process, the control means operates the hot water supply fan in the backflow allowable state when the heating side combustion exhaust gas detection timing is reached. The combustion abnormality detection device for a combustion device according to claim 1, wherein a ventilation operation is performed for a set time at a ventilation capacity set to a smaller capacity than the utility ventilation capacity. 4. A hot water supply having a hot water supply heat exchanger for heating and supplying hot water, a hot water supply burner for heating the hot water supply heat exchanger, and a hot water supply fan for supplying combustion air to the hot water supply burner. Heating heat exchanger for heating the circulating heat medium, a heating burner for heating the heating heat exchanger, and a heating fan with a heating fan for supplying combustion air to the heating burner A common use in which the combustion section and the discharge section of the hot water supply side combustion exhaust gas in the hot water supply combustion section and the heating side combustion exhaust gas discharge section in the heating combustion section are respectively connected and connected, and one exhaust pipe is connected and connected. An exhaust guide section and control means for controlling the operation of the hot water supply combustion section and the heating combustion section are provided, and the control means is configured to control the hot water supply in a hot water supply single combustion state in which the hot water supply combustion section burns alone. For fan The heating fan in a heating-only combustion state in which the heating combustion unit is burned alone, and the hot-water supply fan in a simultaneous combustion state in which the hot water supply combustion unit and the heating combustion unit are simultaneously burned. A combustion ventilation process is performed in which the heating fan is ventilated to supply combustion air, and the hot water supply-side combustion exhaust gas is prevented from flowing to the heating combustion section in the hot water supply alone combustion state. As described above, the heating-side backflow-preventing ventilation process for causing the heating fan to ventilate with the backflow-preventing ventilation capacity is performed, and the heating-side combustion exhaust gas flows to the hot-water supply combustion unit in the heating-only combustion state. Combustion abnormality detection of a combustion device configured to execute a hot water supply side backflow prevention ventilation process in which the hot water supply fan is ventilated by the backflow prevention ventilation capability so as to prevent the hot water supply fan from flowing. In the discharge device, the control unit prevents the heating-side combustion exhaust gas from flowing to the hot-water supply combustion unit side when the ventilation state of the exhaust stack is appropriate in the hot-water supply-side backflow prevention ventilation processing. And, when the ventilation state of the exhaust stack is abnormal, the backflow prevention ventilation capacity is set as a capacity to allow the heating-side combustion exhaust gas to flow to the hot water supply combustion section side, In the shared exhaust guide portion configured to operate a fan, the hot water supply side combustion exhaust gas flows in each of the hot water supply independent combustion state and the simultaneous combustion state, and the hot water supply for the heating only in the heating independent combustion state. Combustion of a combustion device provided with gas concentration detection means for detecting the concentration of a specific component in the combustion exhaust gas at a location where the heating-side combustion exhaust gas flowing to the combustion section flows. Anomaly detection device. 5. The control device according to claim 1, wherein in the combustion ventilation process in the heating-only combustion state, the ventilation capacity of the heating fan is increased or decreased so as to increase or decrease the ventilation volume of the combustion air in accordance with a change in the target combustion volume. The flow control processing, and in the hot water supply side backflow prevention ventilation processing, the backflow prevention ventilation capacity is set in a form to be increased or decreased with a change in the ventilation capacity of the heating fan, and the hot water supply The combustion abnormality detecting device for a combustion device according to claim 4, wherein the device is configured to operate a fan.