JPS5919244B2 - heating cooker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cooking device that is capable of detecting abnormalities inside the device.

Conventionally, a gas sensor is installed at the exhaust port of a cooking device to detect the concentration of steam gas etc. generated from the food depending on the degree of heating and control the heating device to bring the food to the best finishing temperature. However, if the heating device was controlled by something other than a gas sensor, such as a timer to control time or a heat-sensitive element to control temperature, gas sensors were completely unnecessary and were not used. Gas sensors were not fully utilized.

In view of this point, the present invention makes it possible to fully utilize the gas sensor by allowing the gas sensor to detect abnormalities within the cooking device when controlling the heating device using something other than the gas sensor, such as a timer or heat-sensitive element. It is something.

EMBODIMENT OF THE INVENTION Hereinafter, the cooking device of the present invention will be described in detail with reference to the accompanying drawings showing one embodiment.

1 is a heating device consisting of a heater, magnetron, etc.; 2 is a detection circuit that controls energization to the second relay coil 9 depending on the concentration of steam, gas, etc.; 3 is a timer that controls heating time; 4 is This is a first relay coil connected in series with the cooking switch 7, and both are connected to the AC power source 5 via the door switch 6, which is turned on in conjunction with the closing of the door of the cooking device.

Further, the second relay coil 9 is connected in series with the door switch 6.
a normally closed relay contact 91 that is activated by the timer module 3 to shut off the power to the heating device 1; a timer contact 31 that is activated by the timer module 3 to shut off the power to the heating means 1 and the detection circuit 2; and a first relay coil 4. A relay contact 41 is connected to the relay contact 41 which is activated to cut off power to the heating means 1, the detection circuit 2, and the timer monitor 3.

8 is a changeover switch connected in parallel with the timer contact 31;
42 is a self-holding relay contact of the first relay coil 4 connected in parallel with the cooking switch 7; 21 is a gas sensor whose electrical constant changes depending on the concentration of steam, gas, etc.; 22
is a transistor that amplifies the output signal of the detection circuit 2 and operates the second relay coil 9.

In addition, 11 is the cooking chamber of the cooking chamber, 12 is a tray provided in the cooking chamber 11, 13 is the food placed on the tray 12, and 14.14 is a vent provided on the side wall of the cooking chamber 11. mouth,
is and is are dampers provided at the vent 14.degree. 14, and the dampers 15, 15 are operated in conjunction with the changeover switch 8.

16 is an outer case surrounding the cooking chamber 11; 17 and 17 are vents provided in the outer case 16; 18 and 19 are fans and electrical components provided between the outer case 16 and the cooking chamber 11.

The operation of the rice bran cooking device of the present invention having the above structure is as follows.

After opening the door (not shown) of the heating cooker and placing the food 13 on the tray 12 in the cooking chamber 11, the door is closed and the door switch 6 is turned on.

In this state, when the changeover switch 8 is turned ON and the cooking switch 7 is turned ON, the first relay coil 4 is energized, the relay contact 41 is turned ON, and the heating device 1 is turned on via the changeover switch 8 and the relay contact 91. is energized, and the relay contact 42 is turned ON to maintain the energization to the first relay coil 4. Therefore, even if the cooking switch 7, which was once turned ON, is turned OFF, the heating device 1 and the first relay coil 4 are energized. The food 13 continues to be heated and cooked.

Further, by turning on the changeover switch 8, the dampers 15, 15 are rotated, and the vents 14, 14 of the cooking chamber 11 are rotated.
Since the fan 18 continues to operate continuously during heating and cooking, the air in the cooking chamber 11 is moved in the direction shown by arrow A in FIG. 1, and the gas sensor 2
1. Contact.

The air in the cooking chamber 11 contains steam, gas, etc. generated from the food 13 during cooking.

The gas sensor 21 has electrical constants such as a resistance value that change depending on the concentration of vapor, gas, etc. in the air, so the degree of heating of the food 13 can be detected based on changes in the electrical constants.

That is, when the concentration of vapor, gas, etc. in the air reaches a predetermined value, the electrical constant of the gas sensor 21 also reaches a predetermined value, and the output of the detection circuit 2 makes the transistor 22 conductive, and the second
energize the relay coil 9Vc.

When the second relay coil 9 is energized, the relay contact 91 is turned OFF, cutting off the energization to the heating device 1, and at the same time, the relay contact (not shown) cuts off the energization to the first relay coil 4, thereby allowing heating and cooking. to stop.

The above is a case where the heating of food is controlled by the gas sensor 21, but the operation when the heating time is controlled by the timer 3 is as follows.

After closing the door (not shown) of the heating cooker, the timer 3 may be set for a predetermined time, and then the changeover switch 8 may be turned off.

That is, when the cooking switch T is turned on, the first relay coil 4
When the relay contacts 41 and 42 are turned on, the heating device 1 is energized and the food is heated and cooked since the main point 31 is already turned on.

At this time, since the changeover switch 8 is set to "OFF", the dampers 15 and 15 are rotated to a state that shields the vent 14, so that steam, gas, etc. generated from the food 13 does not come into contact with the gas sensor 21. That's what I do.

When a predetermined time set by the timer 3 has elapsed, the timer contact 31 is turned off to stop cooking.

Furthermore, if a transformer or other electrical component 19 forming part of the heating device 1 emits smoke or ignites before the predetermined time set by the timer 3 has elapsed, the smoke etc. The contained air is moved by the fan 18 as indicated by arrow B in Fig. 2.
It is moved in the direction shown.

Gas sensor 2 by contacting gas sensor 21
1, the second relay coil 9 is energized, and the relay contact 91 is turned OFF.

The power supply to the heating device 1 is then stopped.

In addition, if the time is set too long due to an operational error, the food 13 will burn and a large amount of smoke will be generated. It leaks from the gap and contacts the gas sensor 21, turning off the relay contact 91, thereby stopping the power supply to the heating device 1.

While the timer 3 is controlling, the normal amount of steam gas etc. generated from the food 13 is prevented from flowing out of the cooking chamber 11 by dampers 15, 15, so that KI/' is maintained during proper cooking. The i-second relay coil 9 is not energized, and therefore there is no possibility that the energization of the heating device 1 will be cut off unnecessarily.

The cooking device of the present invention as described above has the following effects.

- The safety of the cooking device is significantly improved since the gas sensor is used for detecting abnormalities in the cooking device, except when it is used to control food cooking.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention, and FIG. 1 is a central vertical cross-sectional view of the cooking device showing a state in which cooking is controlled using a gas sensor, and FIG. FIG. 3 is a central vertical cross-sectional view of the cooking device showing the cooking state; FIG. 3 is an electrical wiring diagram of the cooking device. 1...Heating device, 2...Detection circuit, 3...
...Timer, 9...Second relay coil, 21...Gas sensor, 91...Relay contact.

Claims (1)

[Claims] 1. In a heating cooker having a gas sensor that detects steam gas etc. generated from food and controls energization to the food heating device, a control means for setting the heating time by a timer or the like other than the gas sensor is provided, A heating cooking device characterized in that a damper is provided to shield a vent that introduces air into the cooking chamber when the control means is activated, and the gas sensor is used as abnormality detection means for electrical components constituting the rice cooker. .