JPH0783442A - Safety device for gas range - Google Patents

Abstract

PURPOSE:To add the function of safety, and to improve the durability thereof, in the case where one cooks food such as tempura in which a fire is apt to occur. CONSTITUTION:When a cooker pushes an ignition button 15, a control part 20 selects a mode of cooking tempura and actuates a safety circuit. Except that the cooker releases the mode by pushing a release button 16, the control part 20 reads an output value from an infrared sensor 17, and closes a gas- shutting off valve 18 by determining the condition that the cooker is apart from a gas range when the output value does not vary within a definite time, e.g. 10 min, that is, when a specified change of temperature does not occur in the vicinity of the front of the gas range.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas table safety device having a gas shutoff function, and more particularly to a gas table safety device for preventing fire during cooking of tempura and the like.

[0002]

2. Description of the Related Art Conventionally, as a safety device of this kind, a thermistor is attached to the central portion of the stove of a gas table as a means for detecting the temperature of the pan, and when the pan is placed on the stove, the pan bottom comes into contact with the thermistor. , It is proposed to measure the temperature of the pot and shut off the gas when it reaches a dangerous temperature. The thermistor serving as the temperature detecting means of the pot is supported by a spring from below so that it can always contact the pot.

[0003]

As described above, in the conventional gas table safety device, since the thermistor as the temperature detecting means is supported by the spring, when a light pan is placed on the stove. The elastic force of this spring may cause the pan to be turned over, resulting in a dangerous condition.

Further, in a gas table in which the burner has a flame port facing inward, if a thermistor is located at the center of the flame port, it will be abnormally heated. Therefore, the conventional safety device has a problem in heat resistance and further has a problem that an accurate temperature cannot be detected.

The present invention has been made in view of the above problems, and an object thereof is to prevent heat from falling even if it is a light pot, and to provide heat resistance even in a gas table in which the flame mouth faces inward. It is to provide a gas table safety device that is excellent and has excellent safety.

[0006]

A safety device for a gas table according to claim 1 is provided with a gas shutoff valve for stopping the supply of gas to the gas table, and the gas table.
Temperature change detecting means for detecting a temperature change in the vicinity of the gas table, and determination means for determining whether or not the temperature change in the vicinity of the gas table is a certain value or more within a predetermined time based on the detection result of the temperature change detecting means. And a gas shutoff means for closing the gas shutoff valve when the decision means determines that there is no temperature change.

In this gas table safety device, if the temperature change in the vicinity of the gas table does not exceed a certain value within a predetermined time, the cook is away from the vicinity of the gas table for a long time, and there is a high risk of fire. Shut off the gas as.

The safety device for a gas table according to a second aspect of the invention is provided with a releasing means for releasing the operation of the gas shut-off means in a cooking mode other than cooking which may cause a fire. .

In this gas table safety device, the gas cutoff function (safety function) can be disabled by activating the releasing means in the cooking mode where there is no risk of fire.

In the safety device of the gas table according to the third aspect, the temperature change detecting means is constituted by an infrared sensor provided on the front surface of the gas table.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a schematic structure of a gas table 1 according to an embodiment of the present invention. A burner 12 in which a flame is directed inward is arranged at a central position inside the housing 11 of the gas table 1. A gotoku 13 is installed above the burner 12, and a frying pan 14 for cooking tempura or the like is placed thereon. On the front surface of the housing 11, an ignition button 15a and a fire extinguishing button 15b are provided, and a release button 16 is provided. The release button 16 functions as a mode switching means for changing the tempura cooking mode to the stewed cooking mode when the ON operation is performed once, and when the ON operation is performed twice within a predetermined time. Has a function as a releasing means for releasing the safety circuit.

An infrared sensor 17, for example, is provided on the front surface of the housing 11 as a temperature detecting means for detecting a temperature change in the vicinity thereof. ), That is, whether or not there is a cook. The outputs of the ignition button 15a and the fire extinguishing button 15b, the release button 16 and the infrared sensor 17 are respectively sent to the control unit 20 described later.

FIG. 2 is a block diagram showing the configuration of the control unit 20 of the safety device 1 for a gas table according to this embodiment and its surroundings. As shown in this figure, the control unit 20 includes a CPU
(Central processing unit) 21, ROM (read only memory) 22, RAM (random access memory) 2
3 and an input / output port 24, which are connected to each other by a bus 25. The input / output port 24 is connected to the ignition button 15a, the fire extinguishing button 15b, the release button 16 and the infrared sensor 17, and a gas cutoff valve 18 as a safety means.

In the control unit 20, the CPU 21 controls the RA
The sequence for the tempura cooking mode and the stew cooking mode is controlled by executing the program stored in the ROM 22 with M23 as the working area.

Here, the control unit 20 determines, based on the detection result of the infrared sensor 17, whether or not the temperature change in the vicinity of the gas table 1 has a predetermined value or more within a predetermined time, and this determination. It functions as a gas shutoff means for closing the gas shutoff valve 18 when it is determined by the means that there is a temperature change. Further, the control unit 20 uses the release button 1
Together with 6, it also functions as a releasing means for releasing the operation of the safety circuit.

Next, the operation of the safety device of the gas table 1 will be described with reference to the flow chart shown in FIG.

As shown in this figure, first, the ignition button 15
a is turned on by the cook (step S300; Y)
Then, at the same time when the burner 12 is ignited, the control unit 20 enters the tempura cooking mode and activates the safety circuit (step S301). That is, the control unit 20 turns on the infrared sensor 17 only when the cook does not turn on the fire extinguishing button 15b to give an instruction to extinguish the fire (step S302; N) and does not turn on the release button 16 (step S303; N). The output value is read and stored in the RAM 23 in the control unit 20 (step S304). Further, the control unit 20 does not change the output value of the infrared sensor 17 within a predetermined time (for example, 10 minutes), that is, when there is no constant temperature change near the front surface of the gas table 1 (step S30).
5; N), the gas shutoff valve 18 is closed to shut off the gas flow path (step S306). That is, assuming that the cook is away from the front of the gas table 1 for that time,
It activates the safety circuit to prevent the fire of tempura. When there is a constant temperature change within a predetermined time (step S305; Y), it is assumed that there is a cook in front of the gas table 1, the process proceeds to step S302 again, and the same operation is repeated.

If there is a fire extinguishing instruction (step S30)
2; Y), the control unit 20 immediately closes the gas cutoff valve 18 to cut off the gas flow path (step S306). In addition, in step S303, when the release button 16 is turned on and the tempura cooking mode is released (Y), the control unit 20 determines whether or not this on operation has been performed twice consecutively within a fixed time. It is determined (step S307). If the ON operation has not been performed twice consecutively (N), the cooking mode is entered (step S308), the process proceeds to step S302 again, and the safety circuit is activated as in the tempura cooking mode.

In step S307, the on operation is 2
When the operation is performed continuously (Y), the control unit 20 releases the safety circuit. Therefore, in this case, even if the cook is away from the front of the gas table 1 for a predetermined time, the gas is not automatically shut off, which is particularly effective in a cooking mode in which the risk of fire is low.

As described above, in the safety device for the gas table 1 of this embodiment, a sensor (thermistor) supported by a spring in the vicinity of the burner is not mounted unlike the conventional device.
A safety function can be added in the tempura cooking mode and the stewing mode. Therefore, there is no possibility that the light pot will fall. Further, even if the burner 12 in which the flame is directed inward is used, the sensor is not exposed to a high temperature as in the conventional case, so that the durability is improved.

Further, in this embodiment, since the release button 16 is provided, the safety circuit can be released by turning on the release button 16, and the safety circuit is activated or not activated depending on the cooking mode. The operation can be selected.

The present invention has been described with reference to the examples.
The present invention is not limited to the above embodiments, but can be variously modified without changing the gist thereof. For example, in the above embodiment, the safety function is added in the tempura cooking mode and the simmering mode. However, the present invention has a risk of causing a fire when the cook does not touch for a short time during cooking. It is applicable to all. Further, in the above embodiment, the release button 16 is also used as the cooking mode switching means and the safety circuit releasing means, but the cooking mode switching means and the safety circuit releasing means are configured separately. Good.

[0024]

As described above, according to the gas table safety device of the present invention, the gas table is provided with the temperature detecting means for detecting the temperature change in the vicinity thereof, and the temperature change in the vicinity of the gas table within a predetermined time. Since the gas cutoff valve is closed when it is determined that there is no fire, a safety function can be added when cooking such as tempura that easily causes a fire and the pan does not fall over,
Moreover, it has the effect of improving durability.

[Brief description of drawings]

FIG. 1 is a front view showing a partial cross-section of a configuration of a gas table according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a control unit and its periphery in the safety device of the gas table of FIG.

FIG. 3 is a flow chart for explaining the operation of the safety device of the gas table of FIG.

[Explanation of Codes] 1 gas table 15 ignition button 16 release button 17 infrared sensor (temperature detection means) 20 control unit

Claims (3)

[Claims] 1. A gas cutoff valve for stopping the supply of gas to a gas table, a temperature change detection means provided in the gas table for detecting a temperature change in the vicinity of the gas table, and detection by the temperature change detection means. Based on the result, a judgment means for judging whether or not the temperature change in the vicinity of the gas table is a certain value or more within a predetermined time, and when the judgment means judges that there is no temperature change, the gas shutoff valve is closed. A safety device for a gas table, comprising: a gas shutoff means. 2. A safety device for a gas table according to claim 1, further comprising release means for releasing the operation of the gas cutoff means in a cooking mode other than a cooking mode in which there is a risk of fire. . 3. The safety device for a gas table according to claim 1, wherein the temperature change detecting means is an infrared sensor provided on the front surface of the gas table.