JP2961507B2 - Cooking device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooker in which the supply of energy is automatically cut off when a temperature sensing element detects a set temperature.

[0002]

2. Description of the Related Art A conventional cooking device includes a gas burner and other heat sources, and a temperature-sensitive element which is brought into contact with the bottom surface of a pot or other cooking utensil heated by the heat source to respond to the temperature of the bottom surface. A control member responsive to the temperature sensing element is interposed in a gas or other energy supply path connected to the heat source,
It is known that, when the temperature sensing element detects a set temperature of the cooking utensil, for example, 130 ° C., in order to prevent empty heating, supply of energy to a heat source for heating the cooking utensil is cut off by a control member. I have.

[0003]

The above-mentioned prior art is effective in the case of low-temperature cooking in which the cooking temperature is 100 ° C. or less, for example, in water-cooked cooking, but in the case of oil cooking, the cooking temperature is about 180 ° C. In the case of high-temperature cooking, energy supply is cut off before the cooking temperature is reached, which is not preferable. In such a case, the set temperature can be switched. In the case of low-temperature cooking, the set temperature may be set to 130 ° C., and in the case of high-temperature cooking, the set temperature may be changed to about 250 ° C.

However, when low-temperature cooking is performed after high-temperature cooking, it is necessary to return the set temperature set at 250 ° C. during high-temperature cooking to 130 ° C. for low-temperature cooking. Even if the temperature of the bottom surface of the cooking utensil exceeds 130 ° C. due to empty heating or the like, a problem occurs in that the energy supply is not interrupted.

[0005] However, if the set temperature is returned to 130 ° C at the time of restart after the high-temperature cooking is completed, the temperature of the bottom surface of the cooking utensil is set to 130 ° C as in the case of restarting the high-temperature cooking immediately after the high-temperature cooking is completed. If the temperature is higher, the supply of energy is cut off and a restart cannot be performed.

According to Japanese Utility Model Laid-Open Publication No. Sho 60-21224, the bimetal operating at a high temperature equivalent to 250 ° C. and the bimetal operating at a low temperature equivalent to 130 ° C. are both provided so as to be in contact with the bottom of the pan. When the heating power control knob is between high heat and medium fire, the high-temperature bimetal operates to shut off gas supply, and when the knob is between medium fire and fire-extinguishing position, the temperature is low. It is known that the gas supply is cut off by the operation of the bimetal.However, even when performing high-temperature cooking, the heating power may be reduced to medium heat or lower, and conversely, when performing low-temperature cooking. However, if the set temperature for shutting off the gas supply is switched in conjunction with the adjustment of the heat, the gas supply may be cut off properly when cooking is actually performed. It can not be.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and the invention of claim 1 detects the temperature of the bottom of a pot or other cooking utensil heated by a gas burner or other heat source. A temperature-sensitive element, an opening / closing member interposed in a gas or other energy supply path connected to the heat source to increase / decrease the energy supply, and when the temperature of the bottom surface rises to a predetermined set temperature in response to the temperature-sensitive element. Control means for operating the opening / closing member to reduce the energy supply, wherein the control means switches the set temperature to the first set temperature and the second set temperature higher than the set temperature independently of the heat power adjustment of the heat source. It is characterized in that a free switching unit and a reset unit for resetting the set temperature to the first set temperature when starting the heat source are provided.

According to a second aspect of the present invention, there is provided a temperature sensing element for detecting the temperature of the bottom of a pot or other cooking utensil heated by a gas burner or other heat source, and a gas or other energy supply passage connected to the heat source for energy. An opening / closing member for increasing / decreasing the supply, and control means for operating the opening / closing member when the temperature of the bottom surface rises to a predetermined temperature in response to the temperature-sensitive element to reduce the energy supply. A switching unit configured to switch the set temperature between the first set temperature and a second set temperature higher than the first set temperature independently of the heat power adjustment of the heat source; And a reset section for resetting the set temperature to the first set temperature after the lapse of the predetermined time unless the second set temperature is selected.

[0009]

According to the first aspect of the present invention, even if the set temperature is switched to the second set temperature at the time of high-temperature cooking, the set temperature becomes the first set temperature for low-temperature cooking when restarting after the high-temperature cooking is completed. The state is forcibly reset to prevent forgetting to switch the set temperature. If the subsequent cooking is high-temperature cooking, the set temperature may be manually switched to the second set temperature after the start operation. Even if the set temperature is forgotten to be switched to the second set temperature, the temperature of the bottom surface of the cooking utensil may be changed. When the temperature exceeds the first set temperature, the supply of energy is reduced and the heat of the heat source is reduced, or the heat is reduced until the supply of energy is cut off, and the heat of the heat source becomes zero, which is safe.

It is sufficient that the temperature of the bottom surface of the cooking utensil is lower than the first set temperature at the time of restart. However, if the temperature of the bottom surface of the cooking utensil exceeds the first set temperature, the set temperature is reduced to the second set temperature. Before switching to, the energy supply is reduced or cut off and cooking cannot continue. Therefore, in such a case, the set temperature is not reset to the first set temperature for a certain period of the initial period of the start, and the set temperature is changed to the first set temperature within the certain period. By restarting and continuing the cooking at the second set temperature, restarting and subsequent cooking can be performed.

[0011]

Next, an embodiment of the present invention will be described with reference to the drawings. In the drawing, 1 is an annular gas burner serving as a heat source, 2 is a gas supply path to the gas burner 1, 3 is a thermocouple heated by the gas burner 1 to generate an electromotive force, and 4 is provided in the gas supply path 2 An electromagnetic safety valve as an opening / closing member is shown. The electromagnetic safety valve 4 opens in conjunction with the ignition operation, and the coil 4a is energized by an electromotive force from the thermocouple 3 via a safety valve drive circuit 5 built in the microcomputer. Thus, the valve is kept open. Reference numeral 6 denotes a pot as a cooking utensil, and a thermistor 8 as a temperature-sensitive element is disposed on the bottom of the pot 6 above the center of the gas burner 1 so as to be flush with the virtue 7. Reference numeral 9 denotes a low cut circuit, which is connected to the safety valve drive circuit 5 by a thermistor 8.
When a relatively low first set temperature of about 0 ° C. is detected, a signal is issued to instruct the coil 4a to be cut off.
Further, a buzzer 17 sounding command signal is sent to the buzzer drive circuit 16. Reference numeral 10 denotes a high-cut circuit, which outputs a signal to the safety valve drive circuit 5 to instruct the safety valve drive circuit 5 to cut off the current to the coil 4a when the thermistor 8 detects a relatively high second set temperature of about 250 ° C. Buzzer 17 to drive circuit 16
Is sent. Reference numeral 11 denotes a switch determination circuit having a reset function. The switch determination circuit 11 includes a changeover switch 13 serving as a switching unit that can switch the set temperature of the bottom surface of the pan 6 between a first set temperature and a second set temperature higher than the first set temperature. In this embodiment, when the set temperature is the first set temperature, the high cut circuit 10 and the low cut circuit 9 are both operated. However, since the bottom surface temperature of the pan 6 rises from a low temperature, the low cut circuit must be used. 9 works first. At the second set temperature, the low cut circuit 9 is released by a signal from the switch determination circuit 11 and only the high cut circuit 10 operates. That is, when the switch 12 which is turned on in conjunction with the ignition operation and turned off in conjunction with the fire extinguishing operation is turned on and all the circuits are energized, an operation command signal is sent to the low cut circuit 9 and the switch after ignition is switched.
When the switching operation to the second set temperature by the switch 13 is performed, the operation command signal to the low cut circuit 9 is released, only the high cut circuit 10 is operated, and the lamp drive circuit 14 turns on the display command signal of the display lamp 15. Send. When the switching operation to the first set temperature is performed by the changeover switch 13, the switch determination circuit 11 sends an operation command signal to the low cut circuit 9, and further sends a turn-off command signal for the display lamp 15 to the lamp drive circuit 14. When the switch 12 is turned off by the fire extinguishing operation, the operation becomes inoperative. When the switch 12 is turned on by the subsequent ignition operation and all circuits are energized, an operation command signal is sent to the low cut circuit 9 again.

Next, a specific operation in the above configuration will be described. First, when the gas burner 1 is ignited by the ignition operation, the coil 4a is energized by the safety valve drive circuit 5 by the electromotive force of the thermocouple 3, the electromagnetic safety valve 4 is held open, and the gas burner 1 is burned. Here, since the operation command signal is sent from the switch determination circuit 11 to the low cut circuit 9 at the same time when the switch 12 is turned on by the ignition operation, when performing low-temperature cooking of 100 ° C. or less such as water-cooked food, for example, The temperature of the bottom of the pan 6 is 130 ° C., which is the first set temperature.
If it is less than 1, the combustion of the gas burner 1 is continued, and the cooking is continued. However, if the temperature of the bottom surface of the pot 6 becomes 130 ° C. or higher due to idle heating or the like, this is detected by the thermistor 8, a low cut instruction signal is generated from the low cut circuit 9, and the buzzer drive circuit 16 is sounded by the low cut circuit 9. Is sent, the buzzer 17 sounds, the energization of the coil 4a is cut off by the safety valve drive circuit 5, the electromagnetic safety valve 4 is closed, and the combustion of the gas burner 1 is stopped.

After the gas burner 1 is burned as described above, when performing high-temperature cooking of about 180 ° C. such as oil cooking, for example, tempura cooking, the set temperature is changed from 130 ° C. by the changeover switch 13 to the second setting. Switch to the temperature of 250 ° C. According to this, the operation command signal to the low cut circuit 9 is released by the switch determination circuit 11, and a lighting command signal is further sent to the lamp drive circuit 14 by the switch determination circuit 11, and the display lamp 15 is turned on. At this time, if the temperature of the bottom surface of the pan 6 is less than 250 ° C., the combustion of the gas burner 1 is continued, and the cooking is continued. However, due to overheating, pan 6
When the temperature of the bottom of the device becomes 250 ° C. or higher, this is detected by the thermistor 8, a high cut instruction signal is generated from the high cut circuit 10, and the buzzer drive circuit is generated by the high cut circuit 10.
A sounding command signal is sent to 16, the buzzer 17 sounds, the energization of the coil 4 a is cut off by the safety valve drive circuit 5, the electromagnetic safety valve 4 is closed, and the combustion of the gas burner 1 is stopped. This can prevent a fire from occurring.

In the case of the low-cut operation of the low-cut circuit 9, it is preferable that the low-cut instruction signal is generated only when the temperature sensing element detects the first set temperature for a predetermined time (for example, 10 seconds). In this case, even if the thermistor 8 reaches the first set temperature momentarily due to the flame of the pan, such as when the pan is shaken, the low cut instruction signal is not generated. That is, since the electromagnetic safety valve 4 is not closed and the combustion is continued, unnecessary stop of the combustion can be prevented. High cut circuit 10
In the case of the high-cut operation described above, it is better to stop the combustion if the temperature reaches the second set temperature even for a moment for the purpose of fire prevention.

Even if the electromagnetic safety valve 4 is opened by the ignition operation, if the gas burner 1 is not ignited, no electromotive force is generated from the thermocouple 3 and the electromagnetic safety valve 4 immediately returns to the closed state.

According to the fire extinguishing operation, the combustion of the gas burner 1 is stopped, the switch 12 is turned off, and the switch determination circuit 11 is disabled. After that, according to the ignition operation again, the combustion of the gas burner 1 is started, the switch determination circuit 11 is activated, the low cut circuit 9 is activated, and the first
Resets to the set temperature.

In the case where the fire extinguishing operation is performed after or during the high-temperature cooking with the changeover switch 13 switched to the second set temperature and the ignition operation is performed immediately thereafter, the switch 12 is turned on and Activated timer circuit
Since a low cut instruction signal is generated from the low cut circuit 9 for a fixed time of about 30 seconds by 18, that is, the gas cutoff at the first set temperature by the thermistor 8 is canceled and the gas cutoff at the second set temperature is performed, the ignition operation Even if the thermistor 8 is at or above the first set temperature, the supply of gas to the gas burner 1 is continued,
By switching to the second set temperature according to 13, high-temperature cooking can be smoothly continued even after a certain time has elapsed. However, if the temperature is not switched to the second set temperature during the fixed time, the low cut circuit 9 is activated and the first set temperature is reset after the lapse of the fixed time.

In the above embodiment, the supply of gas is cut off at the first set temperature and the second set temperature. However, the present invention is not limited to this. Needless to say, it is good.

[0019]

According to the first aspect of the present invention, the set temperature is automatically reset to the first set temperature at the time of restart even after the high temperature cooking is performed with the set temperature set to the second set temperature. Even if the user forgets to switch the temperature, it is possible to prevent low-temperature cooking from causing an empty boil.

According to the second aspect of the present invention, even if the bottom surface temperature of the cooking utensil is equal to or higher than the first set temperature, as in the case where the high-temperature cooking is stopped for a short time and then restarted, it is surely restarted. After that, the high temperature cooking can be continued by selecting the set temperature to the second set temperature.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Gas burner (heat source) 4 Electromagnetic safety valve (opening / closing member) 6 Pot (cooking utensil) 8 Thermistor (temperature sensing element) 13 Changeover switch (changeover part)

Claims (2)

(57) [Claims] 1. A temperature sensing element for detecting a temperature of a bottom surface of a pan or other cooking utensil heated by a gas burner or other heat source, and an opening / closing device provided in a gas or other energy supply passage connected to the heat source for increasing / decreasing an energy supply. A member, and control means for operating the opening / closing member when the temperature of the bottom surface rises to a predetermined set temperature in response to the temperature sensing element to reduce energy supply, wherein the control means includes A switching unit configured to switch the set temperature to a first set temperature and a second set temperature higher than the first set temperature independently of the heating power adjustment;
A cooker provided with a reset unit for setting the set temperature to a first set temperature when the heat source is started. 2. A temperature sensing element for detecting a temperature of a bottom surface of a pot or other cooking utensil heated by a gas burner or other heat source, and an opening / closing device provided in a gas or other energy supply passage connected to the heat source to increase / decrease energy supply. A member, and control means for operating the opening / closing member when the temperature of the bottom surface rises to a predetermined set temperature in response to the temperature sensing element to reduce energy supply, wherein the control means includes A switching unit configured to switch the set temperature to a first set temperature and a second set temperature higher than the first set temperature independently of the heating power adjustment;
And a reset unit for resetting the set temperature to the first set temperature after the lapse of the certain time unless the second set temperature is selected by operating the switching unit within a certain time period at the beginning of the start of the heat source. Cooking device.