JPH09303788A - Cooker - Google Patents

Abstract

(57) 【Abstract】 PROBLEM TO BE SOLVED: To detect whether or not there is an object to be cooked in a cooking chamber in a heating cooker which shifts from preheating to cooking heating to perform cooking, so preheating is completed only by opening a door. In this case, even if the food to be cooked is not yet placed in the cooking chamber, even if the user presses the start key by mistake and starts cooking and heating, there is obtained a heating cooker that does not cause a problem such as a long-time idle condition. SOLUTION: Cooking heating and preheating are selectively executed depending on the presence or absence of an instruction from the preheating instruction means 20d, and the heating sources 4a and 4b are driven according to the setting conditions by the heating condition setting means 20i and 21 when cooking and heating. In the preheating, the heating source is driven and controlled so that the cooking chamber 2 reaches a predetermined temperature based on the output of the temperature detecting means 16, and after the temperature of the cooking chamber 2 once reaches the predetermined temperature, a predetermined time is reached. In the inside, when the cooking object detecting means 10 and 13 detect the cooking objects 9a and 9b, the preheating is switched to the cooking heating.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating cooker that supplies heating energy to a cooking chamber to perform heating cooking.

[0002]

2. Description of the Related Art In a heating cooker, when heating energy is supplied to a cooking chamber to heat the cooking chamber to a high temperature for cooking, first, the cooking chamber is preheated, and after reaching a predetermined high temperature, an object to be cooked is reached. Need to house and start cooking. Therefore, as a method of preheating the cooking chamber in advance, a method of performing preheating for a predetermined time, a method of performing preheating until reaching a predetermined temperature, and the like are known.

As such a conventional heating cooker, there is a heating cooker described in Japanese Patent Publication No. 61-15330. This is because after the temperature inside the cooking chamber once reaches a predetermined temperature, heating control is performed so as to maintain the predetermined temperature for a predetermined time until the door of the cooking chamber is opened, and once the temperature reaches the predetermined temperature, the predetermined temperature is reached. If the door of the cooking chamber is opened within the time, the preheating is automatically terminated and the cooking heating is started.

[0004]

In the conventional heating cooker as described above, it is not detected whether or not the object to be cooked is in the cooking chamber at the time of performing the cooking and heating after the completion of the preheating, so that the door cannot be opened. If you accidentally press the start key even if there is no food to be cooked in the cooking chamber, the cooking heating will start, and the baking state will continue in the cooking chamber for a long time. The problem occurs.

After the preheating is completed, the door is opened to put the object to be cooked in the cooking chamber. When the door is opened, if the preheating is changed to the cooking heating, the cooking heating start standby state is set. If the start key is not pressed, cooking and heating are not performed, and if the user forgets to press the start key, desired cooking and heating cannot be performed.

Further, the temperature of the cooking chamber reaches a predetermined temperature by the heating source, and after that, the door is opened to finish the preheating, and then the door is left open for a while, and the temperature of the cooking chamber drops below the predetermined temperature. If it does, even if an object to be cooked is placed in the cooking chamber and cooking is performed, sufficient cooking cannot be performed.

The present invention has been made in order to solve the above problems, and an object thereof is to obtain a heating cooker which is easy to use and which does not burn the cooking chamber.

[0008]

In the heating cooker according to the present invention, there are provided a cooking chamber, a door for opening and closing the opening of the cooking chamber, a heating source for supplying heating energy to the cooking chamber, and a temperature of the cooking chamber. Temperature detecting means for detecting, door opening / closing detecting means for detecting opening / closing of the door, heating condition setting means for setting heating conditions for cooking heating, preheating instruction means for instructing to pre-heat the cooking chamber, An object to be cooked detecting means for detecting that the object to be cooked has been inserted into the cooking chamber, and a control means, and the control means performs the cooking heating and the preheating depending on whether or not there is an instruction from the preheating instruction means. The heating source is driven and controlled according to the setting conditions by the heating condition setting means during cooking and heating, and the cooking chamber is controlled based on the output of the temperature detecting means during preheating. When the heating source is driven and controlled so as to reach a constant temperature, and the cooking target detection means detects the cooking target within a predetermined time after the temperature of the cooking chamber once reaches the predetermined temperature. , The transition from preheating to cooking heating.

Further, a cooking chamber, a door for opening and closing the opening of the cooking chamber, a heating source for supplying heating energy to the cooking chamber,
Temperature detecting means for detecting the temperature of the cooking chamber, door opening / closing detecting means for detecting the opening / closing of the door, heating condition setting means for setting heating conditions for cooking heating, and instruction to preheat the cooking chamber in advance. Preheating instruction means, a cooking object detection means for detecting that the cooking object is inserted in the cooking chamber, and a control means, the control means performing the cooking depending on whether or not there is an instruction from the heating instruction means. Heating and preheating are selectively performed, and during cooking heating, the heating source is drive-controlled according to the setting conditions by the heating condition setting means, and during preheating, the cooking chamber is predetermined based on the output of the temperature detecting means. The heating source is driven so as to reach the temperature, and after the temperature of the cooking chamber once reaches the predetermined temperature, the door opening / closing detection means detects the opening of the door within a predetermined time. As well as, the the foods detecting means detects an object to be cooked, and then when the door opening detection means detects clogging of the door, is to start the automatic cooking heat.

The control means may heat the cooking chamber for a predetermined period of time after the temperature of the cooking chamber reaches the predetermined temperature, or when the temperature of the cooking chamber does not end within the predetermined falling temperature. Is prohibited.

Further, the control means heats the heating chamber to maintain the predetermined temperature until the door opening / closing detection means detects opening of the door for a predetermined time after the temperature of the cooking chamber reaches the predetermined temperature. It is a drive-controlled source.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1. 1 and 2 are external perspective views of a microwave oven having both functions of a microwave oven using a microwave as a heat source and an electric oven using a heater as a heat source, showing a heating cooker according to a first embodiment. FIG. 3 is an overall configuration diagram showing an electrical schematic configuration thereof and a mechanical schematic configuration thereof. In the figure, 1 is a microwave oven main body, 2 is a cooking chamber formed inside the main body 1, and is formed of a metal material having heat resistance such as stainless steel. 3 is a door attached to the opening of the cooking chamber 2 so as to be openable and closable,
Although not shown, the open / close state of the door 3 is detected by a door open / close detection means (door switch).

An upper heater 4a and a lower heater 4b are provided on the outer surfaces of the ceiling and bottom of the cooking chamber 2, and 5 is the lower heater 4.
A motor mounted below b, 6 is a rotary shaft made of a heat-resistant material such as ceramic, which is projected from the motor 5 into the cooking chamber 2, and 7 is removable from the rotary shaft 6. A rotary plate 8 is rotatably attached by a rotary shaft 6, and a cooking plate 8 is placed on the rotary plate 7. In addition, 9a is an object to be cooked placed on the cooking plate 8. Reference numeral 10 denotes a weight sensor arranged below the rotary shaft 6, and detects the total weight of the rotary plate 7 mounted on the rotary shaft 6, the cooking plate 8 and the food 9a to be cooked mounted on the cooking plate 8.

Reference numeral 11 denotes a receiving rack provided on both inner walls of the cooking chamber 2, on which a tray 12 having a rectangular shape on which the food 9b to be cooked is placed is placed. Here, the upper shelf 11a and the middle shelf 11
b, the lower receiving rack 11c is formed in three stages. Reference numeral 13 is a tray position sensor provided on both side walls of the cooking chamber 2. The upper tray position sensor 13a and the middle tray position sensor 13 correspond to respective positions of the receiving shelves 11a, 11b and 11c.
b, attach the lower cooking tray position sensor 13c, and attach the tray 1
The position of 2 on the receiving rack 11 is detected. The tray position sensor 13 is composed of a light emitting element and a light receiving element.

Reference numeral 14 is a magnetron for irradiating the cooking chamber 2 with microwaves, 15 is an exhaust passage provided in an upper portion of a side wall of the cooking chamber 2 (a side wall opposite to a side wall on which an operation section described later is installed), and 16 is an exhaust passage. This is a thermistor for detecting the temperature inside 15.

Reference numeral 17 denotes a computing unit, which calculates the rotary plate 7 and the cooking weight from the total weight of the rotary plate 7 and the cooking dish 8 detected by the weight sensor 10 and the cooking object 9a placed on the cooking dish 8. The weight of the dish 9a is calculated by subtracting the weight of the plate 8 or the temperature in the cooking chamber 2 is calculated based on the detection signal from the thermistor 16. 1
A buzzer 8 controls the upper heater 4a and the lower heater 4b so as to keep the temperature in the cooking chamber 2 at a predetermined temperature on the basis of the information from the calculation unit 17, and informs of the end of cooking or an erroneous operation. The control unit has a microcomputer (hereinafter, referred to as a microcomputer) for controlling the above.

Reference numeral 19 denotes an operation panel provided on the side of the opening 2, on the surface of which various operation key groups 20 for performing an operation for performing cooking and heating, and a dial 21 for setting a heating time and a heating temperature are provided. A display unit 22 for displaying a heating time, a heating set temperature, a warning of an erroneous operation, and the like is provided, and the control unit 18 is installed on the back surface.

In the operation key group 20 of the operation panel 19, an oven automatic heating start key 20a for automatically performing oven heating and cooking by one-key operation, and an automatic grill heating for automatically performing grill heating and cooking by the upper heater 4a. Key 20b, Finish key 20c used when you want to adjust the strength of the finish of cooked food 9a or 9b with automatic key, Manual preheating with heaters 4a and 4b to give oven heating instruction Preheating With oven heating instruction A key 20d, an oven heating instruction key 20e without preheating for manually instructing the oven heating without preheating with the heaters 4a, 4b, and a grill heating instruction key 20f for manually instructing the grill heating with the upper heater 4a. , Start heating manually, or restart the heating from the Start of order to continue key 20
g, a cancel key 20h to be used when setting mistakes or to stop heating on the way, the oven heating instruction key 20d,
A setting key 20 for storing a desired temperature in the microcomputer in the control unit 18 after setting the desired temperature with the dial 21 when setting the temperature in the manual oven cooking by 20e.
i etc. are configured.

The operation of the microwave oven configured as described above will be described with reference to the flowchart of FIG. In addition,
FIG. 4 is a timing chart showing the operation of this microwave oven.

First, the cooking conditions are manually set and the cooking dish 8
The operation when cooking in the oven will be described. At the beginning,
With nothing in the cooking chamber 2, that is, with only the rotary plate 7, there is preheating, and the oven heating instruction key 20d is pressed (S1). Next, in order to set cooking conditions such as cooking heating temperature and cooking heating time, the dial 21 of the operation panel 19 is turned to set the heating temperature of 150 ° C., and the setting key 20i is pressed to store the heating temperature in the microcomputer.
Then, the dial 21 is turned again to set a heating time of 45 minutes for cooking and heating, and cooking conditions such as cooking heating temperature and cooking heating time are set (S2).

Next, the door 3 is closed (S3), and the start key 20g on the operation panel 19 is pressed (S4).
Preheating by a and 4b starts (S5). Since the preheating here is heating different from cooking heating, the heating time is not counted and the set heating time of 45 minutes does not decrease.

Here, the temperature in the cooking chamber 2 is set to 15
If the door 3 is opened during the preheating before reaching 0 ° C. (S6), the preheating is temporarily stopped. Close the door 3 again (S7) and start key 20 on the operation panel 19.
When g is pressed (S8), the suspended preheating is restarted and the preheating is continuously performed (S9).

When the set temperature reaches 150 ° C. (S1
0), a buzzer (not shown) is sounded, and the set cooking heating time of 45 minutes is blinked on the display unit 22 to notify the completion of the preheating (S11). Here, the door 3 is opened (S12), and then within a predetermined time (S1
3) When the cooking dish 8 on which the food 9a is placed is placed on the rotary plate 7, the rotary plate 7 and the cooking dish 8 are placed.
The weight sensor 10 detects the total weight of the cooking target 9a and the cooking target 9a (S14).

Next, the door 3 is closed (S15) and the start key 20g is pressed (S16) to start cooking and heating (S1).
7). This cooking and heating is performed for a set heating time of 45 minutes (S18 to S19). In addition, in the cooking of the sponge cake shown in the example here, the preheating temperature and the cooking heating temperature are substantially the same temperature (150 ° C.). If the preheating temperature and the cooking heating temperature are different and both temperatures are set, set the heating temperature for preheating before starting preheating and for cooking heating after starting preheating and before starting cooking heating. Reset the heating temperature of.

Here, after reaching the set temperature of 150 ° C., 1
A buzzer sounds every 30 seconds for 0 minutes to notify that preheating is complete. However, after 10 minutes, the temperature in the cooking chamber 2 drops to such an extent that the effect of preheating becomes insufficient. The process is terminated without shifting to (S13). After that, when the cooking is to be performed again, the preheating instruction is given again, or the cooking heating temperature and the cooking heating time are set, and the procedure is started again from the beginning.

When the temperature inside the cooking chamber 2 drops with the door 3 left open, the temperature drops faster than the temperature when the door 3 is closed, so the door 3 is opened. As a result, after 5 minutes have passed after the preheating is finished, the heating is stopped and the heating is finished (S20).

Next, the operation when the oven-cooking is performed using the square tray 12 will be described. in this case,
The heating operation for preheating is the same as the heating operation for preheating in the cooking dish 8 described above, except that the food 9b to be cooked is placed on the tray 12 and cooked, and the tray 12 on which the food 9b to be cooked is placed. The method of detecting whether or not is placed on the receiving rack 11 in the cooking chamber 2 is different from that of the cooking plate 8.

When the tray 12 on which the food 9b is placed is placed on the middle receiving rack 11b in the cooking chamber 2, the tray position sensor 1
3b detects the tray 12. Tray position sensor 13
Is composed of a light emitting element disposed on one side wall of the cooking chamber 2 and a light receiving element disposed on the other side wall of the cooking chamber 2 facing each other. When the tray 12 is placed on the receiving shelf 11, the tray 12 emits light. Since the light emitted from the element is blocked and the light receiving element cannot receive the light, it is determined that the tray 12 is placed on the receiving shelf 11. Subsequent cooking and heating are the same as those in the above-described oven cooking with the cooking dish 8, and the description thereof will be omitted.

Although the light emitting / light receiving element is used as the tray position sensor 13 here, it may be any one that can directly or indirectly detect the food 9b such as an infrared sensor or a shape sensor. The same applies to the case where the cooking dish 8 is used for oven cooking. In the first embodiment, the weight sensor 10 is used.
However, the tray position sensor 13 or the infrared sensor or the shape sensor may be used.

Further, here, the cooking heating is started by pressing the start key 20g after closing the door 3, but if the object 9 to be cooked is detected in the cooking chamber 2, the door 3 is closed. The cooking and heating may be started at the same time. As shown in the flowchart of FIG. 5, first, the preheating instruction key 20d is pressed with nothing in the cooking chamber 2 (S1). In automatic cooking, preheating is immediately started according to the cooking heating temperature and the cooking heating time stored in advance in the microcomputer (S5). When the set temperature reaches 150 ° C (S10), a buzzer (not shown)
Is sounded and the set cooking and heating time of 45 minutes is blinked on the display unit 22 to notify the completion of the preheating (S11). Now, open the door 3 (S12),
Then, within a predetermined time (S13), when the cooking dish 8 on which the cooking object 9a is placed is placed on the rotary plate 7, the weight sensor 10 detects the total weight of the rotary plate 7, the cooking dish 8 and the cooking object 9a. (S14). Next, when the door 3 is closed (S15), cooking and heating are automatically started (S17), and cooking and heating are performed for a set heating time of 45 minutes (S18 to S19). The cooking heating temperature and the cooking heating time are calculated by the calculation unit 17 during cooking.
Alternatively, the weight of a may be calculated, and the cooking heating temperature and the cooking heating time corresponding to the weight may be calculated.

In the first embodiment, the transition to cooking and heating is prohibited after a lapse of a predetermined time after the temperature in the cooking chamber 2 reaches the set temperature and the preheating is completed, but in the cooking chamber 2 When the temperature is detected and the temperature falls below a predetermined drop temperature, the transition to cooking and heating may be prohibited.

Second Embodiment FIG. 6 is a flow chart showing the operation of the microwave oven showing the heating cooker according to the second embodiment. First, preheating is performed as in the first embodiment (S1 to S11). Cooking room 2 by preheating
From the time when the inside temperature reaches the set temperature of 150 ° C until the door 3 is opened, the temperature inside the cooking chamber 2 is kept at a constant temperature of 150
The upper heater 4a and the lower heater 4b are drive-controlled so as to keep the temperature at ℃. Then, this drive control is completed, for example, about 10 minutes after the set temperature is reached, and after that, even if the door 3 is opened, the food 9 is inserted, or the start key 20g is pressed, the cooking heating is not performed. (S21).

Further, after the temperature in the cooking chamber 2 reaches the set temperature of 150 ° C. by the preheating, the door 3 is opened within 10 minutes, and then the cooking dish 8 on which the food 9 is placed within a predetermined time. Alternatively, when the tray 12 is inserted into the cooking chamber 2, cooking and heating are performed as in the first embodiment (S12).
~ S19).

In the first and second embodiments described above, it is not detected that the cooking dish 8 or the tray 12 is inserted into the cooking chamber 2 at the start of preheating, but the weight sensor 10 or the tray position sensor is not detected. The preheating may be started only when it is detected by 13 that the cooking plate 8 or the tray 12 is not inserted into the cooking chamber 2.

[0035]

Since the present invention is configured as described above, it has the following effects.

The transition from the preheating to the cooking heating is performed immediately when the cooking target detection means detects the cooking target within a predetermined time after the temperature of the cooking chamber once reaches the predetermined temperature. Since the transition from pre-heating to cooking heating is prohibited when is not completed, it is possible to prevent idle baking.

After the temperature of the cooking chamber once reaches the predetermined temperature, the door opening / closing detecting means detects the opening of the door within a predetermined time, the cooking target detecting means detects the cooking target, and finally the door. Since the opening / closing detection means automatically starts cooking and heating when it detects the closing of the door, it is possible to reliably shift from preheating to cooking and heating without operating the start key to prevent cooking mistakes. You can If the preheating is not completed, the door opening / closing detecting means does not detect the opening of the door, or the cooking target detecting means does not detect the cooking target, the preheating is changed to the cooking heating. Since the transfer is prohibited, it is possible to prevent the grill from burning in the cooking chamber.

Further, the control means changes from the preheating to the cooking heating when the temperature of the cooking chamber once reaches the predetermined temperature and when the preheating is not finished within a predetermined time or when the temperature of the cooking chamber is within the predetermined lowering temperature. Since the shift of No. 1 is prohibited, it is possible to prevent the cooking chamber from being baked in the air and prevent cooking in the cooking chamber where the temperature is insufficient, and prevent the cooking target from being insufficiently cooked. Therefore, the cooking and heating can be performed when the temperature of the cooking chamber is surely at the predetermined temperature, and the finished cooking is good and the usability is good.

Further, the control means, after the temperature of the cooking chamber once reaches the predetermined temperature, maintains the predetermined temperature until the door opening / closing detection means detects opening of the door within the predetermined temperature. Since the driving control is performed, cooking and heating can be performed when the temperature inside the cooking chamber is surely at a predetermined temperature, the cooking of the food to be cooked is good, and the usability is good.

[Brief description of drawings]

FIG. 1 is an external perspective view of a microwave oven showing a heating cooker according to a first embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of a microwave oven showing the heating cooker according to the first embodiment of the present invention.

FIG. 3 is a flow chart diagram of a microwave oven showing the heating cooker according to the first embodiment of the present invention.

FIG. 4 is a timing chart of the microwave oven showing the heating cooker according to the first embodiment of the present invention.

FIG. 5 is a flow chart diagram of a microwave oven showing the heating cooker according to the first embodiment of the present invention.

FIG. 6 is a flow chart diagram of the microwave oven showing the heating cooker according to the second embodiment of the present invention.

[Explanation of symbols]

1 microwave oven main body, 2 cooking chambers, 3 doors, 4a
Upper heater, 4b Lower heater, 5 Motor, 6 Rotating shaft, 7 Rotary plate, 8 Cooking plate, 9a Cooking object (on cooking plate 8), 9b Cooking object (on tray 12),
10 weight sensor, 11 receiving rack, 11a upper receiving rack, 1
1b Middle shelf, 11c Lower shelf, 12 trays, 13
Tray position sensor, 13a Upper tray position sensor, 1
3b Middle tray position sensor, 13c Lower tray position sensor, 14 Magnetron, 15 Exhaust passage, 16
Thermistor, 17 arithmetic unit, 18 control unit, 19 operation panel, 20 operation key group, 20a oven automatic heating start key, 20b grill automatic heating start key,
20c Finish adjustment key for automatic cooking, 20d Oven heating instruction key with preheating, 20e Oven heating instruction key without preheating, 20g Start key, 20h
Takeshi key, 20i setting key, 21 dial, 22
Display section.

Claims (4)

[Claims] 1. A cooking chamber, a door that opens and closes an opening of the cooking chamber, a heating source that supplies heating energy to the cooking chamber, a temperature detecting unit that detects the temperature of the cooking chamber, and a door that detects the opening and closing of the door. Opening / closing detecting means, heating condition setting means for setting heating conditions for cooking heating, preheating instruction means for instructing to pre-heat the cooking chamber, and detection of an object to be cooked being inserted into the cooking chamber An object to be cooked detection means and a control means are provided, and the control means selectively executes the cooking heating and the preheating according to the presence or absence of the instruction by the preheating instruction means, and sets the heating condition in the cooking heating. The heating source is drive-controlled in accordance with the setting conditions of the heating means, and the driving source is controlled so as to reach the predetermined temperature in the cooking chamber based on the output of the temperature detecting means during preheating. In addition, after the temperature of the cooking chamber once reaches the predetermined temperature, if the cooked object detecting means detects the cooked object within a predetermined time, the heating is characterized by transitioning from preheating to cooking heating. Cooking device. 2. A cooking chamber, a door for opening and closing the opening of the cooking chamber, a heating source for supplying heating energy to the cooking chamber, a temperature detecting means for detecting the temperature of the cooking chamber, and a door for detecting the opening / closing of the door. Opening / closing detecting means, heating condition setting means for setting heating conditions for cooking heating, preheating instruction means for instructing to preheat the cooking chamber in advance, and detecting that an object to be cooked is inserted into the cooking chamber An object to be cooked detection means and a control means are provided, and the control means selectively executes the cooking heating and the preheating according to the presence or absence of the instruction by the preheating instruction means, and sets the heating condition in the cooking heating. The heating source is driven and controlled in accordance with the setting conditions by the means, and at the time of preheating, the heating source is driven so as to reach the predetermined temperature in the cooking chamber based on the output of the temperature detecting means. After the temperature of the cooking chamber once reaches the predetermined temperature, the door opening / closing detection means detects the opening of the door within a predetermined time, and the cooking target detection means detects the cooking target, and then the cooking target is detected. A heating cooker characterized by automatically starting cooking and heating when the door opening / closing detection means detects the closing of the door. 3. The heating means for cooking when the temperature of the cooking chamber once reaches the predetermined temperature, or when the temperature of the cooking chamber does not end within the predetermined falling temperature after the temperature of the cooking chamber reaches the predetermined temperature. The heating cooker according to claim 1 or 2, characterized in that the transition to (4) is prohibited. 4. The control means keeps the predetermined temperature until the door opening / closing detection means detects the opening of the door within a predetermined time after the temperature of the cooking chamber once reaches the predetermined temperature. The heating cooker according to claim 1 or 2, wherein the heating source is drive-controlled.