JPH1194261A - Heating cooking device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heating cooking device excellent in the heat efficiency of a heating means when temperature regulation control of a cooking object is effected. SOLUTION: A heating cooking device comprises a plurality of annular heating means 21a and 21b sharing a common center; a temperature sensor 11 to detect the temperature of a cooking object; and a temperature regulation control means 30 to regulate a total heating amount of a plurality of heating means 21s and 21b such that the temperature of the cooking object coincides with a given target temperature. In this case, the temperature regulation control means 30 decides a temperature regulation OFF temperature and a temperature regulation ON temperature, being temperature lower that the temperature regulation OFF temperature, according to the target temperature. When the detected temperature of the cooking object is increased to a temperature higher than the temperature regulation OFF temperature, operation of the outer heating means 21b is suspended and only the inner heating means 21 is operated. Thereafter, when the detected temperature of the cooking object is decreased to a value lower than the temperature regulation ON temperature, operation of the outer heating means 21b is restarted to effect temperature regulation of the cooking objects.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooking device for heating an object to be cooked.

[0002]

2. Description of the Related Art Conventionally, an electric stove, which is a cooking device, is provided with a heater as a heating means, and a cooking vessel such as a pot is placed on the heater to perform cooking.

[0003] An electric stove having a temperature control function is also known. In this electric stove, a temperature sensor for detecting a temperature of an object to be cooked is provided, and the temperature detected by the temperature sensor is a predetermined target temperature. That is, the so-called temperature control is performed, in which the heating amount of the heater is adjusted so as to coincide with. Thereby, the user sets the desired temperature and selects the temperature control cooking mode,
Cooking can be performed while keeping the temperature of the cooked product constant, and for example, tempura cooking can be easily performed.

Here, for example, in an electric stove provided with a double inner and outer ring type heater having a common center, the above-mentioned temperature control generally includes a temperature control off temperature in accordance with a target temperature,
A temperature control on temperature set to a temperature lower than the temperature control off temperature, and when the temperature detected by the temperature sensor of the object to be cooked becomes equal to or higher than the temperature control off temperature, the inner and outer double heaters are determined. The operation is interrupted, and after the interruption, when the detected temperature of the object to be cooked by the temperature sensor becomes equal to or lower than the temperature adjustment ON temperature, the operation of both the inner and outer heaters is restarted.

However, when the temperature control is performed by simultaneously operating and stopping all the heaters as described above, the temperature of the food increases and decreases at a high speed, and the temperature of the object to be cooked becomes lower than the temperature control off temperature. Since it fluctuates in a short cycle with the temperature adjustment ON temperature, smooth temperature adjustment cannot be performed. Further, in the case where the operation of the heater is started and stopped via the contact relay, there is a disadvantage that the life of the relay is shortened due to frequent switching of the relay.

In order to control the temperature smoothly, it is conceivable to control the amount of heating of the heater by adjusting the amount of electricity to the heater, but in this case, the circuit for controlling the electricity to the heater becomes complicated. In addition, there is a disadvantage that the manufacturing cost increases.

In order to solve such inconveniences, the internal and external
In an electric stove provided with a heavy heater, the operation and stop of each heater are individually controlled, and when the temperature of the object to be cooked by the temperature sensor becomes equal to or higher than the temperature control off temperature, the two heaters are used. It is conceivable that the operation of only one of the two is stopped and the total amount of heating of the heater is reduced to perform the temperature control.

However, when the detected temperature of the object to be cooked becomes equal to or higher than the temperature control OFF temperature, the inventors of the present application stop the operation of only the inner heater and perform the temperature control. Has the following disadvantages.

That is, if the size (bottom area) of the cooking container in which the object to be cooked is small is small, the cooking container may not be able to completely cover the outer heater. If the operation of the inner heater is stopped when the temperature of the object becomes equal to or higher than the temperature control off temperature, the object to be cooked is kept warm only by the outer heater on which the cooking container is not completely mounted.

Therefore, in this case, the ratio of the amount of heat received by the cooking vessel to the total amount of heat generated by the heater (thermal efficiency) is small, power is wasted, and the effect of suppressing a decrease in the temperature of the object to be cooked (heat retention). Effect) is also reduced.

[0011]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a heating and cooking apparatus in which the heating means has a good thermal efficiency when controlling the temperature of an object to be cooked.

[0012]

In order to achieve the above object, a first embodiment of the present invention comprises a plurality of ring-shaped heating means having a common center, and a cooking object heated by the heating means. A temperature sensor for detecting the temperature of the object, and a temperature for performing temperature control for adjusting the total heating amount of the plurality of heating means so that the temperature of the object detected by the temperature sensor matches a predetermined target temperature. In the heating cooking device provided with a temperature control device, the temperature control device determines a temperature control off temperature and a temperature control on temperature that is lower than the temperature control off temperature in accordance with the target temperature. When the temperature of the object to be cooked detected by the temperature sensor is equal to or higher than the temperature control OFF temperature, the operation of the heating means outside the predetermined number from the center is interrupted, and the heating inside the predetermined number is stopped. Activate only the means, then When the temperature detected by the temperature sensor of the object to be cooked becomes equal to or lower than the ON temperature, the temperature of the object to be cooked is controlled by restarting the operation of the heating means outside the predetermined number. I do.

According to the present invention, when the temperature of the object to be cooked detected by the temperature sensor becomes equal to or higher than the temperature control OFF temperature, the operation of the heating means outside the predetermined number is stopped, and Heating of the object to be cooked is performed only by the heating means from the first to the inner side (temperature adjustment off period). Thereafter, when the temperature of the object to be cooked by the temperature sensor becomes equal to or lower than the temperature adjustment on temperature, all heating is performed. The object to be cooked is heated by means (temperature control ON period).

As a result, the temperature of the object to be cooked does not drop rapidly as in the case where all heaters are turned off at the same time, and smooth temperature control can be performed. Further, even when heating the object to be cooked by using a cooking container that does not completely stand on the outer heating means, the cooking container is located inside from the predetermined number during the temperature control off period. Since the heating is performed by the heater, the heat efficiency (the amount of heat received by the cooking vessel / the total amount of heat generated by the heater) is good, and the temperature of the object to be cooked can be suppressed with a small amount of heat.

According to a second embodiment of the present invention, there are provided a plurality of ring-shaped heating means having a common center, a temperature sensor for detecting a temperature of an object to be heated by the heating means, A heating control device that performs temperature control control that adjusts a total heating amount of the plurality of heating devices so that the temperature of the object to be cooked detected by the sensor matches a predetermined target temperature. When decreasing the total heating amount of the plurality of heating units, the temperature control control unit sequentially stops the operation of the heating units from the outside to the inside and increases the total heating amount of the plurality of heating units. Sometimes, the operation of the heating means is sequentially started from the inside to the outside.

According to the present invention, when the total heating amount of the plurality of heating means is reduced, the operation is stopped from the outer heating means. When increasing the total heating amount of the plurality of heating means, the operation is started from the inner heating means.

Therefore, when a cooking vessel having a small bottom area is heated, the total heating amount can be adjusted after preferentially using the heating means of the portion on which the cooking vessel is placed. As a result, similarly to the first embodiment, the thermal efficiency of the heating means (the amount of heat received by the cooking vessel / the total amount of heat generated by the heating means) is good, and the decrease in the temperature of the object to be cooked can be suppressed with a small amount of heat. .

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is an external view of a glass-top type electric stove, which is a cooking device according to the first embodiment, FIG. 2 is a circuit diagram of the electric stove shown in FIG. 1, and FIG. 3 is a temperature diagram of the electric stove shown in FIG. FIG. 4 is a flowchart of the adjusting operation, and FIG. 4 is a view of the heater portion of the electric stove as viewed from above.

Referring to FIG. 1A, an electric stove body 1 according to the present embodiment is provided with a right heater H1 and a left heater H2 provided below a glass top 2 as heating means, and a grill chamber 3 provided therein. And a grill heater H3 not provided.
When the user operates the heating amount adjustment knobs 4a, 4b, 4c, the heating operation of the right heater H1, the left heater H2, the grill heater H3 is started and stopped, and the heating amount is adjusted.

The right heater H1 has a temperature control function, and a temperature control target temperature is set by a user using the temperature setting device 5. The temperature setting device 5 sets the temperature adjustment target temperature to 160, as shown in FIG.
A temperature switch 6 for setting the temperature in three stages of ° C, 180 ° C, and 200 ° C; and a mode switch 7 for switching the heating control mode of the right heater H1 between a temperature control mode in which temperature control is performed and a normal mode in which temperature control is not performed. Is provided. Also, the right heater H1
Is constituted by two ring-shaped heating elements (heating means of the present invention) (not shown) having a common center, and the user operates the double zone changeover switch 13 to use / disuse the outer heating elements. Can be switched.

Thermistor 11 as a temperature sensor according to the present invention
The electric main body 1 is connected via a jack 8 provided on the electric stove main body 1, a plug 9 inserted and connected to the jack 8, and a cable 10 having one end connected to the plug 9 and the other end connected to the thermistor 11. Connected to The thermistor 11 is used by being immersed in the cooking object B placed in the cooking container A, and detects the temperature of the cooking object B.

The electronic unit 12 provided in the electric stove main body 1 has the mode changeover switch 7 set to the temperature control mode, and when the user operates the heating amount adjusting knob 4a from the heating stop position to the heating position, The temperature control of the right heater H1 is started, and the heating amount of the right heater H1 is adjusted so that the target temperature set by the temperature switch 6 and the temperature of the object B detected by the thermistor 11 match. .

Next, the operation of the electric body 1 will be described with reference to FIG. FIG. 2 is a circuit diagram of the electric stove main body 1.
2. The grill heater H3 is controlled.

The electric stove main body 1 is connected to a plug P via a terminal block T, and a user inserts the plug P into an outlet (not shown) and operates a power switch 48 to supply an AC voltage to the electronic unit 12. A heating amount adjustment switch 2 which is turned ON / OFF in response to the operation of the heating amount adjustment knobs 4a, 4b, 4c shown in FIG.
An AC voltage is supplied to right heater H1, left heater H2, and grill heater H3 via 5a, 25b, 25c.

The right heater H1 is a heating means of the present invention.
b, the inner heating element 21a is activated and deactivated by the ON (closed) / OFF (open) of the operation contact 50 of the relay R5, and the outer heating element 21b is activated by the operation contact 22 of the relay R4.
ON (closed) / OFF (opened) activates and stops. Reference numeral 23 denotes a contact that shuts off power supply to the outer heating element 21b in conjunction with the operation of the double zone switch 13.

Each heating element 21a, 21b, 21
A heating prevention switch 24, which is a bimetal switch, is connected to c and 21d, and when the heating value of each heating element becomes a predetermined value or more, the heating prevention switch 24 connected thereto is turned on (open). This prevents each heating element from being abnormally heated.

Heating amount adjustment switches 25a, 25b, 25
c operates in conjunction with the operation of the heating amount adjustment knobs 4a, 4b, 4c shown in FIG.
It is composed of three contacts 26, 27, 28 and a bimetal heater 29.

When the user sets the heating amount adjustment knob 4a from the heating stop position to the heating position, the contacts 26, 27, and 28 of the heating amount adjustment switch 25a are turned on (closed). When the contacts 27 and 28 are turned on, power is supplied to the heating elements 21a and 21b. When the contact 26 is turned on (closed), the electronic unit 12 recognizes that the user has operated the heating amount adjustment knob 4a. .

The bimetal heater 29 is a set of a heater and a bimetal, and operates in conjunction with the contact 28. When the bimetallic portion of the bimetallic heater 29 is deformed by the heat generated by energization of the heater portion of the bimetallic heater 29, the contact 28 is turned off (open) and the heating element 21 is turned off.
The power supply to the heater portions a, 21b and the bimetal heater 29 is cut off. When the bimetal portion of the bimetal heater 29 gradually cools and returns to the original shape, the contact 28 is turned on (closed) again, and the power supply to the heating elements 21a and 21b is resumed.

The setting of the operating position of the bimetal portion of the bimetal heater 29 (the position at which the contact 28 is turned off due to the deformation of the bimetal) is changed according to the rotation setting position of the heating amount adjusting knob 4a. Since the amount of deformation of the bimetal increases with an increase in the temperature of the bimetal, by changing the operating position of the bimetal portion of the bimetal heater 29, the energization rate to the heating elements 21a and 21b (the energization time per predetermined time) Can be changed.

The configuration and operation of the heating amount adjusting switches 25b and 25c are the same as those of the heating amount adjusting switches 25a, and the heating amount adjusting switches 25b and 25c are respectively operated according to the operation of the heating amount adjusting knobs 4b and 4c. Operate.

The electric stove body 1 includes a right heater H
1. A high-temperature caution lamp 40 that warns the user that the glass top 2 is hot due to the heat generated by the left heater H2.
The bimetal contact 41 is turned on by the heat generated by the right heater H1, the lamp 42 of the high-temperature caution lamp 40 is turned on, and the bimetal contact 43 is turned on by the heat generated by the left heater H2.
N and the lamp 44 of the high-temperature caution lamp 40 is turned on.

The electronic unit 12 includes a temperature control unit 30.
And relays R1 to R5 and a buzzer 32. The relays R1, R2, and R3 turn ON / OFF the power supply to the right heater H1, the left heater H2, and the grill heater H3, respectively.
Is used to change over. That is, when the coil of the relay R1 is energized, the operating contact 33 of the relay R1 becomes O
N (closed), power is supplied to the right heater H1 and the relay R
When the power supply to the first coil is cut off, the operating contact 33 of the relay R1 is turned off (open) and the power supply to the right heater H1 is cut off.

Similarly, for the relays R2 and R3, the operating contact 34 of the relay R2 and the operating contact 35 of the relay R3 are turned ON / OFF in response to the energization and de-energization of the coils of the relays R2 and R3, respectively. Power is supplied to and cut off from the heater H2 and the grill heater H3.

The power lamp 36 connected to the electronic unit 12 is turned on when the power switch 48 is ON, and the right heater lamp 37, the left heater lamp 38, and the grill heater lamp 39 are controlled by the heating amount adjustment switch 25a, 25
Lights up when the contacts 26 of b and 25c are ON (closed). The buzzer 32 informs the user of an abnormality or the like of the apparatus by a warning sound.

The temperature control means 30 is for controlling the temperature of the right heater H1. The temperature control means 30 controls the target temperature set by the user with the temperature switch 6 provided in the temperature setting device 5, and
The operation and stop of the heating elements 21a (inside) and 21b (outside) are performed so that the temperature detected by the thermistor 11 matches.

That is, by energizing the coil of the relay R4, the operating contact 22 of the relay R4 is turned on (closed) to activate the outer heating element 21b, and the energization of the coil of the relay R4 is interrupted to thereby cut off the relay R4. OFF the operating contact 22 of
(Open) to stop the operation of the outer heating element 21b. Similarly, by turning on / off the operating contact 50 of R5, the inner heating element 21a is operated and stopped.

When two heating elements are arranged as in the first embodiment, the predetermined number of the present invention means the first.

Hereinafter, referring to FIG.
Will be described below. The user switches the heating control mode of the right heater H1 to the temperature control mode by the mode changeover switch (see FIG. 1B) 7, sets the desired temperature by the temperature setting switch 6, and moves the heating amount adjustment knob 4a from the heating stop position. When operated to the heating position,
The temperature control of the right heater H1 by the temperature control controller 30 is started.

The temperature control control means 30 first of all, in STEP2,
The temperature control OFF temperature and the temperature control ON temperature (temperature control OFF temperature> temperature control ON temperature) are determined according to the temperature set by the temperature setting switch 6.

Next, the operation of the inner heating element 21a is started in STEP3, and the operation of the outer heating element 21b is started in STEP4. Thereby, the heating of the food B is started,
The temperature detected by the thermistor 11 rises. And STE
When the detected temperature of the food B by the thermistor 11 becomes equal to or higher than the temperature control off temperature in P5, the operation of the outer heating element 21b is stopped in STEP6.

By stopping the operation of the outer heating element 21b, the amount of heating of the food B decreases, and the thermistor 11
Temperature gradually decreases. Then, when the detected temperature of the thermistor 11 becomes lower than the temperature adjustment ON temperature in STEP 7, the operation returns to STEP 4 to restart the operation of the outer heating element 21b.

As described above, by repeating the loop from STEP4 to STEP7, the temperature of the food B is kept substantially in the range from the temperature control ON temperature to the temperature control OFF temperature. And
Even when the outer heating element 21b is stopped, the inner heating element 21a continues to operate, so that the heating of the heating element 21a suppresses a decrease in the temperature of the food B. Therefore, it is possible to stabilize the temperature fluctuation of the food B during the temperature control.

Further, as shown in FIG.
When the cooking container is small as A2 and cannot be completely placed on the outer heating element 21b, it does not pose a problem. The heat efficiency (heat amount received by the cooking vessel / heat generation amount of the heating element 21b) of the heating container 21b decreases.

Therefore, in this case, if the temperature control is performed by operating / stopping the inner heating element 21a while the operation of the outer heating element 21b having a low thermal efficiency is continued, the outer heating element 21b having a low thermal efficiency is low. Operates constantly, and power is wasted.

On the other hand, as described above, on the contrary, while the operation of the inner heating element 21a having a high thermal efficiency is continued,
When the temperature control is performed by operating / stopping the outer heating element 21b having a low thermal efficiency, the outer heating element 21b having a low thermal efficiency is not required.
Since the time for operating is reduced, the power consumption during the temperature control can be reduced.

Next, a second embodiment of the present invention will be described. The device configuration of the second embodiment is the same as that of the above-described first embodiment, and the temperature control operation by the temperature control unit 30 is different.

Referring now to FIG. 5, the operation of the temperature control control means 30 in the second embodiment will be described.

When the user gives an instruction to start heating the right heater H1 in the temperature adjustment mode in the same procedure as in the first embodiment, the temperature adjustment control means 30 executes STEP2.
In step 1, the first temperature control off temperature, the first temperature control on temperature, the second temperature control off temperature, and the second temperature control on temperature (second temperature control off temperature> (1st temperature control OFF temperature> 2nd temperature control ON temperature> 1st temperature control ON temperature).

Then, in STEP 22, the inner heating element 21 is formed.
Then, in step 23, the outer heating element 21b is operated to start heating the food B. After the start of heating, when the temperature detected by the thermistor 11 for the food B becomes equal to or higher than the first temperature control off temperature, the processing proceeds from STEP 24 to STEP 25.
The operation of the outer heating element 21b is stopped in STEP25, and the total heating amount of the right heater H1 is reduced.

Then, in STEP 26, the thermistor 11
If the detected temperature of the food B is equal to or higher than the second temperature control off temperature, the operation of the inner heating element 21a is stopped in STEP 27, and the total heating amount of the right heater H1 is further reduced (in this case, 0). Then, in STEP 28, the process waits until the temperature detected by the thermistor 11 for the food B drops below the second ON temperature.

If the detected temperature of the food B by the thermistor 11 drops below the second temperature-control ON temperature in STEP 28, the process proceeds to STEP 29 to activate the inner heating element 21a to increase the total heating amount of the right heater. , STE
It returns to P26.

When the calorific value of the right heater H1 with respect to the food B by the inner heating element 21a exceeds the natural heat radiation of the food B, the temperature of the food B rises.
In EP26, the detection temperature of the food B by the thermistor 11 becomes equal to or higher than the second temperature control off temperature, and the process proceeds to STEP27.
As described above, since the loop of STEP26 to STEP29 is repeatedly executed, the temperature of the food B is substantially maintained in the range from the second temperature control ON temperature to the second temperature control OFF temperature.

On the other hand, the inner heating element 21 of the right heater H1
When the calorific value of the object to be cooked B due to “a” falls below the amount of natural heat radiation of the object to be cooked B, the temperature of the object to be cooked B decreases, so the STE of the loop of STEP26 and STEP30 is performed.
Proceeding from P30 to STEP23, the outer heating element 21b is operated in STEP23 to increase the total heating amount of the right heater H1. In this case, the temperature of the food B is kept substantially in the range from the first temperature adjustment ON temperature to the second temperature adjustment ON temperature.

As described above, in the second embodiment, when the total heating amount of the right heater H1 is reduced, the operation is stopped in order from the outer heating element 21b to the inner heating element 21a. When increasing the total heating amount of the right heater H1, the heaters are operated in order from the inner heating element 21a to the outer heating element 21b.

Therefore, as shown in FIG. 4, the cooking vessel A2 is small and does not completely fit on the outer heating element 21b, and the thermal efficiency of the outer heating element 21b (the amount of heat received by the cooking vessel A2 / the heating element 21b). When the calorific value is small, the inner heating element 21a having a high thermal efficiency is preferentially used, so that the consumption of power can be suppressed and the food B can be heated.

In the above-described first and second embodiments, an electric stove in which two ring-shaped heating elements are arranged has been described as an example. However, an electric stove in which three or more heating elements are arranged is described. There may be. In this case, the predetermined number of the present invention is determined according to the number of heating elements, the amount of heat generated by each heating element, the size, and the like.

In the first and second embodiments described above, an electric heating element is shown as the heating means, but other heating means such as a gas burner may be used.

[Brief description of the drawings]

FIG. 1 is an external view of a glass-top electric stove.

FIG. 2 is a circuit diagram of the electric stove shown in FIG.

FIG. 3 is a flowchart of a temperature control operation of the electric stove shown in FIG. 1;

FIG. 4 is a top view of the electric stove shown in FIG. 1;

5 is a flowchart of a temperature control operation of the electric stove shown in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Electric stove main body, 2 ... Glass top, 3 ... Grill room, 4 ... Heating amount adjustment knob, 5 ... Temperature setting device, 6 ... Temperature switch, 7 ... Mode changeover switch, 8 ... Jack, 9
... Plug, 10 ... Connection cable, 11 ... Thermistor, 1
2 ... Electronic unit, 13 ... Double zone changeover switch,
H1 right heater, H2 left heater, H3 grill heater, 21a, 21b, 21c, 21d heating element, 25
a, 25b, 25c: Heating amount adjustment switch, 30: Temperature control means

Claims (2)

[Claims] 1. A plurality of ring-shaped heating means having a common center, a temperature sensor for detecting a temperature of the object to be heated by the heating means, and a temperature of the object to be detected by the temperature sensor And a temperature control unit that performs a temperature control that adjusts a total heating amount of the plurality of heating units so that the target temperature matches the predetermined target temperature. The temperature control off temperature and the temperature control on temperature that is lower than the temperature control off temperature are determined according to the temperature, and the temperature of the object to be cooked detected by the temperature sensor is equal to or higher than the temperature control off temperature. At the time, the operation of the heating means outside the predetermined number from the center is interrupted, only the heating means inside the predetermined number is operated, and thereafter, the detected temperature of the object to be cooked by the temperature sensor is turned on. When the temperature drops below , The cooking apparatus characterized by performing the temperature control by resuming the operation of the outside of the heating means than the prescribed order. 2. A plurality of ring-shaped heating means having a common center, a temperature sensor for detecting a temperature of the object to be heated by the heating means, and a temperature of the object to be detected by the temperature sensor. And a temperature control unit that performs temperature control that adjusts the total amount of heating of the plurality of heating units so that the target temperature coincides with the predetermined target temperature. When the total heating amount of the heating means is decreased, the operation of the heating means is sequentially stopped from the outside to the inside, and when the total heating amount of the plurality of heating means is increased, the heating is sequentially performed from the inside to the outside. A cooking device for starting operation of the means.