JP2940646B2 - Incomplete combustion prevention device for combustion equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for preventing incomplete combustion in combustion equipment such as a gas water heater and a gas table.

[0002]

2. Description of the Related Art In the prior art, a CO sensor is provided in a combustion exhaust gas and an alarm is issued as soon as a detected CO concentration in the combustion exhaust gas by the CO sensor exceeds a predetermined reference value. Or a control means for stopping the operation of the device and ensuring safety (hereinafter referred to as Conventional Example 1).

[0003] In addition, C in the combustion exhaust gas by the CO sensor
There is also a structure in which the operation of the device is stopped after a certain period of time after the O concentration detection value reaches a predetermined reference value or more (hereinafter referred to as Conventional Example 2).

[0004]

The prior art 1 of the above prior art is incomplete with only the detected value of the CO concentration in the combustion exhaust gas by the CO sensor, regardless of the capacity of the equipment and the duration of the combustion. In order to judge the combustion, there is a problem that an alarm is issued or the operation of the device is stopped even though the actual total amount of CO emission is small.

[0005] In the conventional example 2, if it is reused without stopping within a certain continuous elapsed time, it will not stop until after a certain continuous elapsed time. When CO is emitted, there is a problem that the CO concentration in the room rises rapidly and poses a danger to the human body.

The present invention has been made in view of the above-mentioned problems of the prior art, and is controlled by the three factors of the output of the CO sensor, the device capacity, and the combustion time, so that the optimum imperfection corresponding to the actual danger degree is achieved. It is an object of the present invention to provide a device for preventing incomplete combustion of combustion equipment capable of performing combustion prevention control.

[0007]

In order to achieve the above object, an apparatus for preventing incomplete combustion of a combustion apparatus according to the present invention is provided with a CO sensor installed in a combustion exhaust gas and an output of the CO sensor. Comparison control means for comparing the reference value of the CO concentration to determine incomplete combustion, operation control means for correcting the reference value of the CO concentration according to the amount of combustion gas, and incomplete combustion by the comparison control means. Integrating means for integrating the deviation with time to obtain an integrated value when determined, and means for performing an alarm or stopping the device when the integrated value obtained by the integrating means exceeds a predetermined safety limit. The main feature is the configuration provided with.

[0008] Further, there is provided means for enabling the equipment to be reused after a lapse of a certain period of time from when an alarm or a stoppage of the equipment until the room reaches a safe CO concentration.

[0009]

The device for preventing incomplete combustion of a combustion apparatus according to the present invention comprises:
With the above configuration, the detection value of the CO concentration in the combustion exhaust gas by the CO sensor is compared with a predetermined reference value by the comparison control means to determine whether or not the combustion device is incomplete combustion at that time. to decide.

The reference value is corrected by the arithmetic and control means to an optimum value according to the capacity of the device at that time, that is, the amount of combustion gas.

When the comparison control means determines that the combustion is incomplete, the integrating means time-integrates the deviation between the reference value and the CO concentration to obtain an integrated value adapted to the amount of combustion gas.

When the integrated value obtained by the integrating means exceeds a predetermined safety limit, an operation command is issued to an alarm or an equipment stopping means to issue an alarm or stop the operation of the equipment.

When an alarm is issued or the operation of the device is stopped, the device can be reused only after a certain period of time has elapsed until the safe CO concentration in the room or the like has been reached by the reusing means of the device.

[0014]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of an apparatus for preventing incomplete combustion of a combustion apparatus according to the present invention.

In FIG. 1, reference numeral 1 denotes a CO sensor, which is installed in an exhaust pipe 2 of a gas water heater, for example, as shown in FIG. The CO concentration contained in the heated exhaust gas after the heat exchange is calculated from the output and detected, and the detected value is input to the comparison control means A described later.

A is a comparison between the detected value of the CO concentration in the combustion exhaust gas by the CO sensor 1 and a predetermined reference value of the CO concentration, and the combustion equipment (hereinafter referred to as a gas water heater in the embodiment) at that time. And a comparison control device for determining whether or not the combustion is incomplete. The output of the comparison control device is provided to be input to an integrator C described later.

B is an arithmetic and control unit for correcting the reference value to an optimum value according to the amount of combustion gas at that time (hereinafter referred to as an input). Provided.

C is the integration of the CO concentration adapted to the input by time-integrating the difference between the CO concentration and the reference value corrected by the arithmetic and control unit B when the comparison control unit A determines that the combustion is incomplete. An integrating device for obtaining a value is provided so that when the integrated value exceeds a predetermined safety limit, an operation command is output to an alarm device D or a device stopping device E described later.

D is an alarm device for issuing an alarm indicating that the gas water heater is in an incomplete combustion state based on an operation command from the accumulating device C, and comprises, for example, an alarm lamp and an alarm buzzer.

E is an equipment stop device for immediately stopping the operation of the equipment when the gas water heater incompletely burns based on the operation command from the accumulating device C. The main electromagnetic valve 7 provided in the gas supply path 6 is closed to stop the combustion of the gas burners 3 and 4.

The alarm device D or the device stopping device E
Activates one of them during incomplete combustion,
This is a two-step control of a warning and a stop of the device depending on the level of the CO concentration.

F is a means for enabling an alarm to be issued by the alarm device D or for re-use after the operation of the gas water heater is stopped by the device stop device E. The device is provided so that the device can be reused after a predetermined time T elapses. This fixed time is set to an approximate estimated time, and is counted by a timer or the like.

The input is a gas water heater,
In order to obtain the capacity corresponding to the number, as shown in FIG. 6, when supplying gas to the two sets of gas burners 3 and 4, a common proportional control valve 8 provided in the gas supply path 6 is provided.
The amount of gas is controlled by switching solenoid valves 11 and 12 provided in gas supply pipes 9 and 10 to gas burners 3 and 4. On the other hand, combustion air is controlled by the number of revolutions of air supply fan 13 to supply gas hot water. The output of the vessel can be changed.

In FIG. 6, reference numerals 14 and 15 denote gas nozzles,
16 is a water supply pipe, 17 is a hot water supply pipe, 18 is a hot water tap, and 19 is a combustion chamber.

Next, the operation of the above embodiment will be described.

The CO sensor 1 installed in the exhaust pipe 2 detects the CO concentration in the combustion exhaust gas by calculating from the output thereof,
The detected value is input to the comparison control device A.

In the comparative control device A, the detected value of the CO concentration in the combustion exhaust gas by the CO sensor 1 and a predetermined CO
The gas water heater is compared with a reference value of the concentration (for example, a limit of the CO concentration which is highly dangerous in practice) to determine whether or not the gas water heater is in an incomplete combustion state at that time, and it is determined that the combustion is incomplete. At that time, the fact is input to the integrating device C.

The reference value of the CO concentration is calculated by the arithmetic control means B.
Accordingly, the value is corrected to an optimum value according to the input at that time (see FIG. 2), and the incomplete combustion determination in the comparison control device A is always accurately performed. In addition, the correction method is set such that the reference value is set lower as the number of inputs is larger, and is set higher as the number of inputs is lower.

When the comparison and control unit A determines that the combustion is incomplete, the integrating unit C integrates the difference between the CO concentration and the reference value corrected by the arithmetic and control unit B over time, and calculates the CO concentration adapted to the input. The integrated value is obtained, and when the integrated value exceeds a predetermined safety limit, an operation command is issued to the alarm device D or the device stopping device E (FIGS. 2 and 3).
reference).

For this reason, the alarm device D is activated to turn on the alarm lamp to notify the effect, or the device stop device E is activated to close the original solenoid valve 7 and to burn the gas water heater. Is stopped immediately (see FIG. 3).

After the warning by the alarm device D or the combustion stoppage by the device stop device E, the reuse of the gas water heater requires a certain estimated time T until the safe CO concentration is reduced by the device F that enables reuse. It is impossible only after the lapse of time (see FIG. 4).

A specific example of the above-described series of incomplete combustion prevention operations will be described with reference to the flowchart of FIG. 5. When the gas burner is ignited in step 100 to start combustion, in step 101, the CO concentration is reduced. The reference value is determined by correcting by the arithmetic and control unit B to a value suitable for the input.

When the reference value of the CO concentration is determined in step 101, the reference value is compared with the detected value of the CO concentration in the combustion exhaust gas by the CO sensor 1 in step 102 to determine whether the gas water heater has incomplete combustion. The comparison control device A determines whether or not the state is present.

When it is determined in step 102 that the combustion is incomplete, in step 103, the difference between the CO concentration and the reference value is integrated with respect to time and the CO concentration adapted to the input, that is, the CO concentration in accordance with the actual risk level. , And determines whether or not the integrated value has exceeded the safety limit.
Determined by

If it is determined in step 103 that the integrated value has exceeded the safety limit, in step 104, the alarm device D or the device stopping device E is operated to issue an alarm or stop the device from burning.

In step 104, when an alarm is sounded or combustion of the equipment is stopped, in step 105, the gas water heater is restarted by the reusing means F until a certain time elapses until the safe CO concentration is reduced. The use is regulated, and after a certain period of time, the operation can be restarted in step 100.

[0037]

According to the apparatus for preventing incomplete combustion of a combustion device according to the present invention, the incomplete combustion prevention control can be performed in accordance with the actual danger level. Therefore, it is possible to provide a safe and easy-to-use combustion device because it is possible to solve the problem that the combustion continues even though the risk is high.

In addition, the structure is such that it cannot be reused until a certain time has passed after an alarm or a device stop, so that there is no danger due to the accumulation of CO concentration even in frequent intermittent use. It can be used.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of a main functional section of an incomplete combustion prevention device for a combustion apparatus according to the present invention.

FIG. 2 is a graph showing an example of a relationship between a reference value and a CO concentration adapted to an input.

FIG. 3 is a graph showing an integrated value obtained by time-integrating a deviation between a reference value and a CO concentration in FIG. 2;

FIG. 4 is a graph showing an example of a relationship between CO concentration and time when the device is reused.

FIG. 5 is a flowchart showing an example of an operation state of the present invention.

FIG. 6 is a schematic sectional view of a gas water heater to which the present invention is applied.

[Description of Signs] 1 CO sensor A Comparison control means B Operation control means C Accumulation means D Alarm means E Equipment stop means F Equipment reuse means

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-56-133533 (JP, A) JP-A-62-192063 (JP, U) JP 2-25093 (JP, B2) (58) Field (Int.Cl. ⁶ , DB name) F23N 5/24 107 F23N 5/00 F23N 5/20 F23N 5/26 101

Claims (2)

(57) [Claims] 1. A CO sensor installed in combustion exhaust gas, a comparison control means for comparing the output of the CO sensor with a predetermined reference value of CO concentration to judge incomplete combustion, Calculation control means for correcting the reference value according to the amount of combustion gas, integration means for integrating the deviation over time when the comparison control means determines incomplete combustion to obtain an integrated value, and integration means for obtaining the integrated value. A device for preventing incomplete combustion of a combustion device, comprising means for giving an alarm or stopping the device when the integrated value exceeds a predetermined safety limit. 2. The specific invention according to claim 1, further comprising means for enabling the equipment to be reused after a certain period of time elapses from the alarm or the stoppage of the equipment to a safe CO concentration in the room. Features Incomplete combustion prevention equipment for combustion equipment.