JPH05264041A - Heating and cooking device - Google Patents

Abstract

PURPOSE:To provide a heating and cooking device in which a thermal output may not be stopped even after a pan is temporarily removed from the device and if the pan is continuously removed from the device the thermal output is automatically stopped. CONSTITUTION:There is provided a movable member 2 which is moved up or down in response to presence or non-presence of a pan A. As the movable member 2 is moved downwardly, a switch element 6 is turned on and the presence of the pan A is detected. A temperature sensing part 3 detects a temperature of the pan A and a flame at the burner 1 is diminished when the detected temperature exceeds the upper limit temperature set in a control circuit 4. In the case that the pan A is not present, the upper limit temperature is corrected in such a manner that the flame is diminished after the burner 1 keeps the ignited state only for a predetermined period of time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating cooker in which the heat output of a heat source is stopped when the temperature of a pot detected by a temperature detector exceeds a preset upper limit temperature.

[0002]

2. Description of the Related Art Conventionally, in a heating cooker such as a gas stove, the temperature of a pot is detected by a temperature detector, and when the detected temperature exceeds a preset upper limit temperature, the fire is extinguished to prevent overheating of the pot. Is proposed. That is, as shown in FIG. 8, a movable body 2 that is vertically movable with respect to the burner 1 is provided in the center of the burner 1 that is a heat source, and a temperature detection unit such as a thermistor or a thermocouple built in the movable body 2 is provided. 3 detects the temperature of the pot A, and when the control circuit section 4 reaches a preset upper limit temperature, a safety valve provided in the gas flow path to the burner 1 by a control signal output from the control circuit section 4 (Fig. (Not shown). The movable body 2 is spring-biased upward and elastically contacts the central portion of the bottom surface of the pan A to thermally couple the temperature detecting unit 3 to the pan A.

The control circuit section 4 provides a gas flow path to the burner 1 based on the temperature detected by the temperature detecting section 3 so that the pan A is heated according to a control pattern preset according to the cooking target. Adjust the opening of the inserted variable flow valve. That is, the heat output is controlled by adjusting the flow rate of the gas supplied to the burner 1. In addition, the presence or absence of the pot A is determined based on the rate of change in temperature with respect to the time detected by the temperature detection unit 3, and the burner 1 is controlled to be extinguished when there is no pot A. That is, since the burner 1 and the temperature detection unit 3 are located apart from each other, heat is transferred to the temperature detection unit 3 via the pot A, and the presence of the pot A increases the heat capacity. The presence or absence of the pan A is detected by utilizing the fact that the temperature change rate is smaller than that when the pan A is not present.

[0004]

In the above configuration, the presence / absence of the pot A is determined based on the rate of change in temperature detected by the temperature detection unit 3. Therefore, the presence / absence of the pot A immediately after the burner 1 is ignited. However, when the pan A is removed from the gas stove during cooking, it is difficult to judge whether or not the pan A is present.

By the way, since the temperature detector 3 does not directly detect the temperature of the flame of the burner 1, it is detected by the temperature detector 3 when there is no pot A and the heat output of the burner 1 is maximum. The temperature is almost stable when the heating by the burner 1 and the heat radiation of the system are in equilibrium. Such an equilibrium temperature will be called a stable temperature. On the other hand, the upper limit temperature for extinguishing the burner 1 is set according to the object to be cooked, for example, a relatively low upper limit temperature is set for simmered food, and a relatively high upper temperature limit is set for fried food or grilled food. become. Therefore, when cooking fried foods and grilled foods, cooking cannot be done unless the upper limit temperature is set higher than the stable temperature, and when cooking stewed foods, the upper limit temperature must be set lower than the stable temperature. It may not be possible to prevent overheating of pan A. In this way, depending on the cooking target, there are cases where the upper limit temperature is higher or lower than the stable temperature,
The following problems occur.

That is, when the upper limit temperature Th is set to be lower than the stable temperature and the pot A is placed as shown in FIG. 9A, the upper limit temperature Th is set only when the pot A is overheated.
And burner 1 is extinguished at time t ₄ . On the other hand, when the cooking pot A is removed from the gas stove, immediately after that, the temperature detected by the temperature detection unit 3 reaches the upper limit temperature Th, so that the burner 1 is extinguished immediately (the extinguishing time is t ₃ ). In this way, if the time it takes for the burner 1 to extinguish after the pot A is lowered is short, if you want to continue cooking after the pot A has been temporarily lowered, put the burner on the pot A after placing it. 1
Must be ignited again, which causes a problem that it takes time.

On the contrary, when the upper limit temperature is set higher than the stable temperature, the burner 1 extinguishes when the pot A overheats (the extinguishing time is t ₃ ) as shown in FIG. 9B. However, when the pan A that is being heated is removed from the gas stove, the temperature detected by the temperature detection unit 3 does not rise above the stable temperature T ₀ and cannot reach the upper limit temperature Th, so that the burner 1 cannot be extinguished. Occurs.

The present invention is intended to solve the above problems, and detects the presence or absence of a pot based on the reciprocating movement of a movable body according to the presence or absence of a pot, regardless of the heating temperature of the pot. Make it easy to detect the presence or absence of a pot,
Even if the pan is lowered, the heat output can be obtained from the heat source for a predetermined period so that cooking can be continued even if the pan is temporarily lowered, and the heat output of the heat source can be ensured after the predetermined period has elapsed. It is intended to provide a heating cooker with improved safety by stopping it.

[0009]

According to the present invention, a heat source for heating a pot, a temperature detector for detecting the temperature of the pot, and a temperature detector for detecting the temperature of the pot when the temperature detected by the temperature detector exceeds a preset upper limit temperature. In a heating cooker having a control circuit unit for stopping heat output, a pan detecting unit including a movable body that reciprocates depending on the presence or absence of a pan, and a switch element that turns on and off according to the reciprocating movement of the movable body. Is provided as a common configuration.

In order to achieve the above-mentioned object, the control circuit unit controls the heat output of the heat source according to the control pattern set according to the cooking target while the pan detection unit detects the pan. And a first upper limit temperature higher than the stable temperature set as the temperature detected by the temperature detection unit when the heat output of the heat source is maximum and there is no pan in the cooking mode. A second upper limit temperature lower than the stable temperature can be set, and when the pan detection unit no longer detects the pan during cooking, the mode shifts to the stop mode. In the stop mode, the first upper limit temperature is set in the cooking mode. The upper limit temperature is corrected downward while the temperature detected by the temperature detection unit is equal to or lower than the corrected upper limit temperature, the heat output of the heat source is stopped, and the second upper limit is set in the cooking mode.
When the upper limit temperature of is set, the upper limit temperature is corrected upward, and when the temperature detected by the temperature detection unit becomes higher than the corrected upper limit temperature, the heat output of the heat source is stopped and the heat output of the heat source is stopped. If the pan detector detects the pan again before the operation, it will return to the cooking mode.

According to the second aspect of the present invention, the control circuit section operates in the cooking mode in which the heat output of the heat source is controlled by the control pattern set according to the cooking object while the pan detection section detects the pan. , When the pan is not detected by the pan detector during cooking, the mode shifts to the stop mode.In the stop mode, if the pan is not detected by the pan detector within a preset time, the heat output of the heat source is stopped and the heat source If the pan detector detects the pan again before the heat output is stopped, the cooking mode is restored.

[0012]

According to the structure of claim 1, the movable body which reciprocates depending on the presence or absence of the pot, and the on-state which responds to the reciprocating movement of the movable body.
Since the pan detecting unit is configured by the switch element that is turned off, the presence or absence of the pan can be easily and surely determined regardless of the temperature detected by the temperature detecting unit. In addition, when the pan detection unit no longer detects the pan during cooking, it shifts to the stop mode, and in the stop mode, depending on the high and low of the upper limit temperature set in the cooking mode, the pan is not detected for a while. The heat output is obtained from the heat source, and then the upper limit temperature is modified so that the heat output of the heat source stops, and moreover, if the pan is put again before the heat source stops in the stop mode, it will shift to the cooking mode. In the case of temporarily lowering the pan and continuing cooking again, it is possible to continue cooking while maintaining the heat output of the heat source. Also, when the temperature is higher when the pan is placed like fried food or grilled food than when the pan is lowered, it is possible to reliably stop the heat output of the heat source by lowering the upper limit temperature. is there.

According to the second aspect of the present invention, in the stop mode, the heat output of the heat source is stopped unless the pan is detected by the pan detection unit within a preset fixed time, and the pan is turned off before the heat source is stopped. If you put it down, it will return to cooking mode, so if you want to temporarily lower the pan and continue cooking again, just return the pan within a certain time, and after a certain time, ensure the heat output of the heat source. It can be stopped.

[0014]

EXAMPLE FIG. 1 shows a schematic configuration. Burner 1 which is a heat source
A movable body 2 which is movable in the vertical direction is inserted into the central portion of the. As shown in FIG. 2, the movable body 2 has a tubular guide 21.
A head 22 for mounting the pan A in a form of closing the upper end surface of the head 22 is provided, and a temperature detecting portion 3 composed of a thermistor is fixed to the lower surface side of the head 22. The shaft portion is fixed at a fixed position together with the burner 1. By holding the return spring 24 between the spring 23 and the spring 23, the spring is biased upward. A switch element 6 made up of a micro switch is arranged below the guide 21, and the positions of the movable body 2 and the switch element 6 are set so that the switch element 6 is turned on / off as the movable body 2 moves up and down. The relationship is set.

Therefore, as shown in FIG. 1 (b), when the pot A is placed at a position where it can be heated by the burner 1, the movable body 2 moves downward and the switch element 6 is turned on, so that the pot A
Is detected. When the pan A is lowered from the burner 1, the movable body 2 is moved upward by the spring force of the return spring 24, and the switch element 6 is turned off. In this way, the movable body 2 and the switch element 6 constitute the pan detection unit 5. Further, when the pan A is placed on the burner 1, the head 22 is elastically contacted with the pan A by the spring force of the return spring 24, so that the pan A and the temperature detection unit 3 are moved to the head 2.
It is thermally coupled via 2. The temperature detection unit 3 and the switch element 6 are connected to the control circuit unit 4.

As shown in FIG. 3, a safety valve 11, a main valve 12 and a variable flow valve 13 are provided in the gas supply passage 10 to the burner 1. Safety valve 11 and variable flow valve 13
Are controlled by receiving a control signal from the control circuit unit 4.
The control circuit unit 4 has a cooking mode in which cooking is performed according to a preset control pattern while the pot A is detected by the pot detector 5, and a predetermined mode when the pot is not detected by the pot detector 5 during cooking. And a stop mode for extinguishing the burner 1 when the conditions are satisfied. In the cooking mode, the variable flow valve 13 is based on the temperature detected by the temperature detector 3 so that the temperature of the pan A follows the control pattern.
The heat output of the burner 1 is controlled by adjusting Further, in the cooking mode and the stop mode, the safety valve 1 is activated when the temperature of the pan A exceeds the preset upper limit temperature.
1 is closed and the burner 1 is extinguished.

Next, the operation of the control circuit section 4 will be specifically described. As shown in FIG. 4, when the burner 1 is ignited (step S1), it is determined whether or not the pan A is detected by the pan detector 5 (step S2), and when the pan A is detected (that is, the switch). When element 6 is on), it operates in cooking mode. That is, the upper limit temperature T at which the temperature Ts detected by the temperature detector 3 is set
It is determined whether or not h has been reached (step S3), and if the temperature is at or above the upper limit temperature Th (Ts ≧ Th), power supply to the safety valve 11 is stopped and the safety valve 11 is closed (step S4). When the safety valve 11 is closed, the burner 1 is extinguished (step S
5).

On the other hand, when the pan detecting section 5 does not detect the pan A, it operates in the stop mode. In the stop mode, the upper limit temperature is changed according to the level of the upper limit temperature set in the cooking mode. That is, when the pot A is not placed on the burner 1, the heating by the burner 1 and the heat radiation of the system are in equilibrium,
The temperature detected by the temperature detector 3 is almost stable near a predetermined temperature, and if this stable temperature is set to T ₀ , the upper limit temperature set in the cooking mode is higher than the stable temperature depending on the cooking target. There are cases where it is set and cases where it is set low. For example, for fried and baked goods, burner 1
The upper limit temperature is set high (270 ° C. for fried food, 300 ° C. for grilled food) to prevent the fire from being extinguished, and the upper limit temperature is set low (150 ° C., etc.) to prevent charring due to overheating in cooked food.

Therefore, it is determined whether the upper limit temperature Th is on the low temperature side, that is, whether it is set lower than the stable temperature T ₀ (step S6). If the upper limit temperature Th is lower than the stable temperature T _0, it is determined. (Th <T ₀ ), stable temperature T ₀
Than raises the upper limit temperature Th ₁ to a low predetermined temperature (step S7). The upper limit temperature Th ₁ changed in this way
And the temperature Ts detected by the temperature detection unit 3 are compared (step S8), and when the detected temperature Ts becomes equal to or higher than the upper limit temperature Th ₁ , the safety valve 11 is closed to extinguish the burner 1. That is, as shown by the solid line in FIG. 5A, by increasing the upper limit temperature from Th to Th ₁ (Th <Th ₁ ),
The time from down pot A to the burner 1 is extinguished at time t ₁ (extinguishing at time t _2), it is delayed than the case where corresponding to the original upper limit temperature Th (extinguishing at time t ₂ ') it can. As a result, when the pan A is temporarily lowered in the cooked food, the ignition state of the burner 1 can be continued for a predetermined period.
When the pan detector 5 detects that the pan A has been placed again during this period (step S9), the cooking mode can be restored and cooking can be continued. In addition, the burner 1 automatically extinguishes the fire after a predetermined period has passed since the pot A was lowered.

When the upper limit temperature Th is not set to the low temperature side, it is set to the high temperature side. Therefore, the set upper limit temperature Th is lower than the temperature detected by the temperature detection unit 3 during cooking. On the side, the temperature is corrected to a temperature higher than the stable temperature T ₀ (step S10). The upper limit temperature Th ₂ corrected downward in this way is set to the temperature T detected by the temperature detection unit 3.
When the temperature Ts detected by the temperature detection unit 3 becomes equal to or lower than the upper limit temperature Th _{2 in} comparison with s (step S11), the safety valve 11 can be closed and the burner 1 can be extinguished. That is, as shown by the solid line in FIG. 5 (b), by lowering the pan A at time t ₁ and shifting to the stop mode, the upper limit temperature is lowered to Th ₂ ,
At the original upper limit temperature Th, the burner 1 could not be extinguished even if the pan A was lowered at the time t ₁ , whereas the detected temperature Ts becomes less than or equal to the upper limit temperature Th ₂ after the lapse of a predetermined period, and the burner 1 extinguishes. It is done (fire extinguishing time is t ₂ ).

(Embodiment 2) In the embodiment 1, the upper limit temperature is changed when the pan A is lowered to shift to the stop mode, but in this embodiment, as shown in FIG. In step S26, S27, it is determined whether or not the pot A has been placed again within a fixed time τ (see FIG. 7) after the stop mode has been entered, and the fixed time τ has elapsed since the stop mode was entered. If the pan A is not detected in step S24, the safety valve 11 is closed (step S24) and the burner 1 is extinguished (step S25).

In this configuration, as shown in FIGS. 7 (a) and 7 (b), the pot A is lowered irrespective of the level of the upper limit temperature Th and the stable temperature T ₀ (the pot A is lowered at time t _1). ) The burner 1 can be extinguished after a certain time τ has passed (the burner 1 extinguishes at time t ₂ ). Therefore, even if the burner 1 is ignited without the pan A, the burner 1 automatically extinguishes after a lapse of a certain time t ₁ . Other configurations and operations are similar to those of the first embodiment.

[0023]

According to the invention of claim 1, the movable body reciprocates depending on the presence or absence of the pot, and the on-state according to the reciprocal movement of the movable body.
Since the pan detecting unit is configured by the switch element that is turned off, there is an advantage that the presence or absence of the pan can be easily and surely determined irrespective of the temperature detected by the temperature detecting unit. In addition, when the pan detection unit no longer detects the pan during cooking, it shifts to the stop mode, and in the stop mode, depending on the high and low of the upper limit temperature set in the cooking mode, the pan is not detected for a while. The heat output is obtained from the heat source, and then the upper limit temperature is modified so that the heat output of the heat source stops, and moreover, if the pan is put again before the heat source stops in the stop mode, it will shift to the cooking mode. In the case where the pan is temporarily lowered and cooking is continued again, there is an effect that cooking can be continued while maintaining the heat output of the heat source. In addition, when the temperature of the pan with the pan placed is higher than that with the pan down, lowering the upper limit temperature can surely stop the heat output of the heat source. effective.

According to the invention of claim 2, in the stop mode,
If the pan is not detected by the pan detector within a preset time, the heat output of the heat source is stopped.If you put the pan before the heat source stops, the pan returns to cooking mode, so temporarily lower the pan. When cooking is continued again, it is sufficient to return the pot within a fixed time, and there is an advantage that the heat output of the heat source can be surely stopped after the fixed time elapses.

[Brief description of drawings]

FIG. 1 shows an embodiment, (a) is a schematic configuration diagram in a state where a pot is not placed, and (b) is a schematic configuration diagram in a state where a pot is placed.

FIG. 2 is a sectional view of a movable body used in an example.

FIG. 3 is a schematic configuration diagram including a gas supply passage of an embodiment.

FIG. 4 is an operation explanatory diagram illustrating a processing procedure of the first embodiment.

FIG. 5 is an operation explanatory diagram of the first embodiment.

FIG. 6 is an operation explanatory view showing the processing procedure of the second embodiment.

FIG. 7 is an operation explanatory diagram of the second embodiment.

FIG. 8 is a schematic configuration diagram showing a conventional example.

FIG. 9 is an operation explanatory diagram of a conventional example.

[Explanation of symbols]

 1 Burner 2 Movable body 3 Temperature detection part 4 Control circuit part 5 Pan detection part 6 Switch element A Pan

Claims (2)

[Claims] 1. A heat source for heating a pan, a temperature detecting section for detecting the temperature of the pan, and a control circuit section for stopping the heat output of the heat source when the temperature detected by the temperature detecting section exceeds a preset upper limit temperature. In a heating cooker equipped with, a pan detection unit including a movable body that reciprocates depending on the presence or absence of a pan, and a switch element that turns on and off according to the reciprocating movement of the movable body is provided, and the control circuit unit includes: While the pan is being detected by the pan detector, it operates in the cooking mode that controls the heat output of the heat source according to the control pattern set according to the cooking target. In the cooking mode, the heat output of the heat source is maximum and the pan is It is possible to set a first upper limit temperature higher than the stable temperature set as the temperature detected by the temperature detection unit and a second upper limit temperature lower than the stable temperature when there is no temperature, and by the pan detection unit during cooking. The pot is no longer detected And the stop mode, in the stop mode, when the first upper limit temperature is set in the cooking mode, the upper limit temperature is corrected downward, and the temperature detected by the temperature detection unit is equal to or lower than the corrected upper limit temperature. Then, the heat output of the heat source is stopped, the upper limit temperature is corrected upward when the second upper limit temperature is set in the cooking mode, and the temperature detected by the temperature detection unit becomes equal to or higher than the corrected upper limit temperature. Then, the heat output of the heat source is stopped, and when the pan detection unit detects the pan again before the heat output of the heat source is stopped, the cooking mode is restored. 2. A heat source for heating the pot, a temperature detecting section for detecting the temperature of the pot, and a control circuit section for stopping the heat output of the heat source when the temperature detected by the temperature detecting section exceeds a preset upper limit temperature. In a heating cooker equipped with, a pan detection unit including a movable body that reciprocates depending on the presence or absence of a pan, and a switch element that turns on and off according to the reciprocating movement of the movable body is provided, and the control circuit unit includes: While the pan detector detects the pan, it operates in the cooking mode that controls the heat output of the heat source according to the control pattern set according to the cooking target, and stops when the pan is no longer detected by the pan detector during cooking. In the stop mode, if the pan detector does not detect a pan within a preset time, the heat output of the heat source is stopped, and the pan detector detects the pan again before the heat output of the heat source stops. Then the cooking mode A cooking device characterized by returning to the normal mode.