JPH11287451A - Thermal cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thermal cooker which can keep the temperature of oil almost at a fixed temperature when material to be fried is fed being divided a plurality of times in frying with a cooking container. SOLUTION: A temperature regulating means 10 compares a temperature detected by means of a temperature sensor 6 with upper limit and lower limit values and when the temperature is not above the lower limit value, it controls a gas supply controller 3 to shift the firing power to a large level and to shift it to a small level when the temperature becomes the upper limit value or higher. When a falling rate of the detected temperature as determined by a rate detection means 14 becomes a specifie rate or higher, a set temperature control means 11 defines a peak value of the detected temperature at the heating by the small firing power immediately before the falling thereof as a second upper limit and furthermore, the second limit value is determined. When the second upper limit value and a second lower limit value are inputted from the set temperature control means 11, the temperature regulating means 10 employs the second upper limit value and the second lower limit value set by the set temperature control means 11 as upper limit value and lower limit value replacing each of the first upper limit and the second lower limit values set by an upper and lower limit temperature setting means 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooking device having a temperature adjusting function for adjusting an oil temperature to an appropriate temperature when frying.

[0002]

2. Description of the Related Art In general, fried foods cannot be heated in large quantities at a time like boiled foods, so that it is necessary to pay attention to temperature control. However, oil has a low specific heat, so that the temperature easily rises to reach the flash point, and the temperature drops quickly, so that it is difficult to maintain a constant temperature. In order to solve this kind of problem, a heating cooker having a temperature adjustment function for keeping the oil temperature in a cooking container within a certain range (adjusting to an appropriate temperature) when performing frying has been provided. ing.

FIG. 5 shows a schematic configuration of a heating cooker of this type. In the heating cooker having the configuration shown in FIG. 5, a gas burner 1a is used as a heating means in the stove 1, and the center of the lower surface of a cooking vessel (pan) 5 placed on a gotoku 4 disposed around the gas burner 1a. A temperature sensor 6 composed of a thermistor or the like is provided as temperature detecting means for detecting the temperature of the cooking vessel 5 in contact with the section. The temperature detection signal output from the temperature sensor 6 is input to the control device 7 '.

The control device 7 ′ controls an electromagnetic valve of the gas supply control device 3 inserted in the gas supply path between the main plug 2 and the stove 1 based on a temperature detection signal from the temperature sensor 6. The gas supply control device 3 is controlled to keep the temperature detected by the temperature sensor 6 within a certain range for the purpose of keeping the oil temperature substantially constant when frying the food in the cooking container 5. That is, if the temperature detected by the temperature sensor 6 is lower than the lower limit set by the controller 7 ',
When the amount of heating by the gas burner 1a increases, and conversely, when the temperature detected by the temperature sensor 6 reaches the upper limit set by the controller 7 ', the amount of heating by the gas burner 1a decreases.

[0005] Fig. 6 (a) shows an example of the change over time in the temperature detected by the temperature sensor 6 and the oil temperature in the cooking vessel 5 when frying is performed, and Fig. 6 (b) shows the thermal power of the gas burner 1a ( (Heating amount). The heating power (heating amount) of the gas burner 1a is changed in two stages (large fire, small fire) as shown in FIG. The solid line m ₁ in FIG. 6 (a) shows the temperature detected by the temperature sensor 6, a constant chain line m ₂ denotes the oil temperature. In addition, the gas burner 1a generates thermal power,
It can be adjusted in three stages of small fire. Hereinafter, FIG. 6 will be further described.

[0006] In the example shown in FIG.
When the target temperature is 180 ° C, the lower limit T _L1Is higher than the target temperature
5 ℃ higher, upper limit T_H1Is set 10 ° C higher than the target temperature
Have been. Time t₀Heating by gas burner 1a
When it is started (at this time the heat is a large fire), the cooking container
5, the temperature detected by the temperature sensor 6 rises
Ascend. Thereafter, the temperature detected by the temperature sensor 6 becomes T
₀(For example, 178 ° C.), the thermal power of the gas burner 1a
Switch to low heat. Then, fried seeds (hereinafter, load
The temperature detected by the temperature sensor 6
When the temperature drops below the constant temperature x ° C (for example, 4 ° C), the gas burner
The heating power of 1a is switched to a large fire. Then the control device
7 'indicates that the temperature detected by the temperature sensor 6 is the upper limit value T._H1that's all
, The gas supply control device 3 is controlled to control the gas burner 1a.
Is switched to small fire, and the detected temperature is lower than the lower limit T_L1Less than
When it goes down, it controls the gas supply control device 3 to make the heat big
The operation of switching is repeated.

[0007]

FIG. 6 shows an example.
In the example, time t₁At the time t
_ThreeAt the time t_FourThe second negative
At the time t ₆To take out the load
(Essentially, it is necessary to divide the fried seeds and put them in multiple times
But it is fried continuously), but the gas burner 1a fires
Time t when power is low_ThreeTake out the load at and 2
Time t at which the second load is applied_FourTime interval is relatively
Although the oil temperature is almost maintained at the target temperature because it is long,
The temperature detected by the temperature sensor 6 is equal to the upper limit T_H1Than
Will also be quite high. Therefore, the temperature sensor 6
The difference between the detected temperature and the oil temperature in the cooking vessel 5 increases.
Time t when the second load is applied_FourImmediately after
Above the upper limit of the oil temperature relative to the target temperature.
T_H1Since the decrease in the detected temperature with respect to
t_FiveAlthough the oil temperature has not recovered to the target temperature at
The detected temperature is above the upper limit T_H1And the firepower is small from large fire
It was switched to fire, and as a result the oil temperature reached the target temperature
It is said that it will be kept almost constant at a very low temperature
There was a problem.

Further, even when the load applied for the first time is left for a while even though the load is sufficiently raised, the difference between the temperature detected by the temperature sensor 6 and the oil temperature in the cooking vessel 5 increases, and The problem sometimes occurred.
The present invention has been made in view of the above circumstances, and its purpose is to keep the oil temperature at a substantially constant temperature even in a case where the frying seed is divided into a plurality of times when the frying is performed in the cooking container. It is an object of the present invention to provide a heating cooker that can perform heating.

[0009]

According to the first aspect of the present invention, there is provided a heating means for heating a cooking vessel, a heating control means for controlling an amount of heating by the heating means, and
A temperature detecting means for detecting the temperature of the cooking vessel, and an upper limit and a lower limit which is smaller than the upper limit by a certain value and a temperature detected by the temperature detecting means are compared, and if the detected temperature is lower than the lower limit, the heating amount is increased. A heating cooker provided with a temperature adjusting means for controlling the heating control means so as to reduce the amount of heating when the temperature rises to the upper limit value, a speed detecting means for obtaining a decreasing speed of the temperature detected by the temperature detecting means, Setting temperature control means for setting, as the upper limit, a peak value of the detected temperature before the heating amount increases immediately before the descent when the descent speed obtained by the speed detection means is equal to or higher than a predetermined speed. In the case where the fried seeds are divided into a plurality of times when the frying is performed in the cooking container, the value immediately before the drop of the detected temperature due to the second frying after the second frying is thrown is the upper limit value. Therefore, even if the difference between the temperature detected by the temperature detecting means and the oil temperature in the cooking vessel is large before the second fried seed is introduced, the oil temperature is lower than the temperature before the introduction. Can be stabilized with
The oil temperature during cooking can be kept almost constant.

[0010]

(Embodiment) FIG. 2 shows a schematic configuration of the present embodiment, and FIG. 1 shows a block diagram. Note that FIG.
Is similar to that of the conventional configuration, and therefore, the same components are denoted by the same reference numerals and the description thereof will be partially omitted.

The gas supply control device 3 as a heating control means includes:
The control device 7 controls the oil temperature in the cooking vessel 5 so as to be kept substantially constant. That is, when the temperature detected by the temperature sensor 6 is lower than the lower limit set by the control device 7, the control device 7 controls the gas supply control device 3 to switch the heating power of the gas burner 1a to a large fire and raise the oil temperature. I do. Conversely, when the oil temperature in the cooking vessel 5 reaches the set upper limit, the control device 7 controls the gas supply control device 3.
Is controlled, and the heating power of the gas burner 1a is switched to small fire.

In order to perform the above operation, the control device 7 includes:
As shown in FIG. 1, the target temperature of the oil in the cooking vessel 5 is set to a plurality of preset temperatures (for example,
160 ° C., 180 ° C., and 200 ° C.). The target temperature selected by the temperature setting means 21 is input to the upper and lower limit temperature setting means 12 provided in the control device 7, and the upper and lower limit temperature setting means 12 sets a first upper limit value and a first lower limit value based on the target temperature. Is set. Each of the first upper limit value and the first lower limit value is determined in advance in association with the target temperature.
The first upper limit is, for example, 10 ° C. higher than the target temperature,
Is set, for example, 7 ° C. higher than the target temperature.
When the heating is started, the temperature adjusting means 10 detects the temperature (detected temperature) of the cooking vessel 5 detected by the temperature sensor 6, the first upper limit value set by the upper and lower limit temperature setting means 12, and the first lower limit. Initiates a comparison with a value. Here, based on the comparison result between the temperature detected by the temperature sensor 6 and the first upper limit value and the first lower limit value, the temperature adjustment unit 10 sets the temperature detected by the temperature sensor 6 to be lower than the first lower limit value. When the temperature becomes low, the gas supply control device 3 is controlled to switch the heat of the gas burner 1a to a large fire. Is switched to a small fire.

After the start of the heating, when the oil temperature reaches the target temperature, a buzzer or the like may be used to notify that the oil temperature has reached the target temperature when the temperature reaches a lower limit set in advance according to the target temperature. The control device 7 includes a speed detecting means 14 for obtaining a lowering speed of the speed detected by the temperature sensor 6, and a peak of the detected temperature at the time of the small fire immediately before the lowering when the lowering speed obtained by the speed detecting means 14 is equal to or higher than a predetermined speed. The value is set as a second upper limit, and a value smaller than the second upper limit by a fixed value (for example, 5 ° C.) is determined as a second lower limit, and the second upper limit and the second lower limit are set to temperature. A set temperature control means for outputting to the adjusting means; By the way, the speed detecting means 14
The situation in which the descent speed determined in step (1) is equal to or higher than the predetermined speed is a decrease in the oil temperature due to the introduction of the fried seeds.

The temperature adjusting means 10 includes a set temperature control means 1
When the second upper limit value and the second lower limit value are input from 1 and the upper and lower limit temperature setting means 1 are set as the upper limit value and the lower limit value.
The second upper limit value and the second lower limit value set by the set temperature control means 11 are used instead of the first upper limit value and the first lower limit value set in 2, respectively. A comparison is made between the second lower limit value and the temperature detected by the temperature sensor 6, and the gas supply control device 3 is controlled based on the comparison result. In other words, when the descending speed obtained by the speed detecting means 14 is equal to or higher than the predetermined speed, the gas supply control device 3 is activated when the temperature detected by the temperature sensor 6 becomes lower than the second lower limit.
Is controlled to switch the heating power of the gas burner 1a to a large fire, and when the temperature detected by the temperature sensor 6 rises to a second upper limit, the gas supply control device 3 is controlled to control the gas burner 1a.
Is switched to small fire.

Thus, in the cooking device of the present embodiment,
In the case where the deep-fried seeds are thrown in a plurality of times, the detected temperature immediately before throwing the second deep-fried seeds is set as the upper limit used by the temperature adjusting means 10 after the throwing of the second deep-fried seeds. Even if the difference between the temperature detected by the temperature sensor 6 and the oil temperature in the cooking vessel 5 is large before being charged, the oil temperature can be prevented from stabilizing at a temperature lower than the target temperature, and the oil during cooking can be prevented. The temperature can be kept almost constant.

The operation will be described below with reference to the flowchart of FIG. First, when the target temperature is set by the temperature setting means 21 (S1), the first upper limit value and the first lower limit value according to the target temperature are set by the upper and lower temperature setting means 12, and the temperature adjusting means 10 A first upper limit and a first lower limit are adopted as the upper limit and the lower limit, respectively (S2). After that, when the ignition operation is performed, the gas burner 1a
Heating by the large fire is started (S3). Thereafter, when the detected temperature reaches a predetermined temperature T ₀ (for example, 178 ° C.), the heating power of the gas burner 1a is switched to small fire (S4), and the temperature detected by the temperature sensor 6 is changed to a predetermined temperature x ° C.
(S4) or more (S4), the gas burner 1
The heat of a is switched to a large fire (S6). Thereafter, heating by the large fire is continued until the temperature detected by the temperature sensor 6 becomes equal to or higher than the upper limit (S7). When the temperature detected by the temperature sensor 6 exceeds the upper limit, the heating power of the gas burner 1a is switched to small fire (S8). Thereafter, heating by a small fire is continued until the temperature detected by the temperature sensor 6 becomes lower than the lower limit (S9). When the temperature detected by the temperature sensor 6 becomes lower than the lower limit value, the heating power of the gas burner 1a is switched to a large fire (S10), and when the descent speed obtained by the speed detecting means 14 is higher than a predetermined speed (S11), the set temperature control is performed. The second upper limit value and the second lower limit value are set by the means 11, and the temperature adjusting means 12 adopts the second upper limit value and the second lower limit value as the upper limit value and the lower limit value, respectively (S12). ). On the other hand, in S11,
If the descending speed is lower than the predetermined speed, the process returns to S7.

The control device 7 is basically constituted by a microcomputer, and is provided with an analog-digital converter for converting the temperature detection signal of the temperature sensor 6 into digital data. As the heating means, a heater or an electromagnetic cooker may be used in addition to the gas burner. As the temperature detecting means, a thermistor which comes into contact with the bottom of the cooking vessel 6 containing the food is used. Alternatively, a device that detects the temperature of the cooking container 6 based on the amount of infrared rays or the like may be used.

(Embodiment) FIG. 4 (a) shows an example of the detected temperature of the temperature sensor 6 and the oil temperature in the cooking vessel 5 with time when frying is performed, and FIG.
The change of the heating power (heating amount) of a is shown. As shown in FIG. 4B, the thermal power of the gas burner 1a is changed in two stages (large fire and small fire). The solid line m ₁ in FIG. 4 (a) shows the temperature detected by the temperature sensor 6, a constant chain line m ₂ denotes the oil temperature.
The gas burner 1a is capable of adjusting the heating power in three stages: large, medium and small.

In the example shown in FIG. 4, the target temperature of the oil in the cooking vessel 5 is 180 ° C., and the first lower limit value T _L1 is 18
The temperature is set to 5 ° C., and the first upper limit value T _H1 is set to 190 ° C. When the heating by the gas burner 1a is started at time t ₀ (the heating power at this time is a large fire), the cooking vessel 5
As the temperature rises, the temperature detected by the temperature sensor 6 rises. When the detected temperature reaches T ₀ (178 ° C. in the present embodiment), the heating power of the gas burner 1a is switched to a small fire, and the detected temperature of the temperature sensor 6 is changed to a predetermined temperature x ° C. by loading a load or the like.
(4 ° C. in this embodiment) or more, the gas burner 1a
The firepower is switched to large fire. After that, the control device 7
Is the temperature detected by the temperature sensor 6 controls the first upper limit value T _H1 above comprising the gas supply controller 3 gas burners 1
The operation of switching the heating power to a small fire and switching the heating power to a large fire by controlling the gas supply control device 3 when the detected temperature falls below the first lower limit value _TL1 is repeated.

By the way, in the example shown in FIG. 4, the _first fry seed (hereinafter referred to as load) is input at time t _{1, the} load is taken out at time t ₃ , and then the second time at time t ₄ perform the introduction of the load is performed at time t ₆ the extraction of the load (in short, doing so continuously fried which divides the fried species performing a plurality of input). Because heating power is a relatively long time interval until the time t ₄ when turning on the second load at time t ₃ when being taken out load becomes small fire oil temperature despite being maintained substantially target temperature , the detected temperature is much higher than the first upper limit value T _H1 by the temperature sensor 6, that the difference between the oil temperature in the cooking vessel 5 and the temperature detected by the temperature sensor 6 is increased are the same as the conventional example It is.

However, in the present embodiment, when the second load is applied at time t ₄ , the temperature detected by the temperature sensor 6 drops sharply to a value smaller than the first lower limit value T _L1 . Since the heating power of the gas burner 1a is switched to the large fire and the descent speed is equal to or higher than the predetermined speed, the upper limit value and the lower limit value used by the temperature adjusting means 10 are respectively set to the second value.
Since switching to the upper limit value T _H2 and the second lower limit value T _L2, then, thermal switches to small fire gas burners 1a when the temperature detected by the temperature sensor 6 is equal to or greater than _H2 second upper limit T, the detected temperature Becomes _smaller than the second lower limit value T _L2 , the thermal power is switched to a large fire. As a result, as shown in FIG. 4 (a), the oil temperature in the cooking vessel 5 is stable at almost the same oil temperature as before the charging even after the second loading.

[0022]

According to the first aspect of the present invention, there is provided a heating means for heating a cooking vessel, a heating control means for controlling an amount of heating by the heating means, a temperature detecting means for detecting a temperature of the cooking vessel, an upper limit and an upper limit. A lower limit lower than the lower limit by a fixed value and a temperature detected by the temperature detector are compared, and the heating controller increases the heating amount when the detected temperature is lower than the lower limit and decreases the heating amount when the detected temperature rises to the upper limit. A temperature adjusting means for controlling the temperature control means, wherein the speed detecting means for determining the rate of decrease of the temperature detected by the temperature detecting means; Since there is provided set temperature control means for setting the peak value of the detected temperature before the immediately preceding increase in the heating amount as the upper limit value,
In such a case that the fried seeds are divided into a plurality of times when performing the frying by the cooking container, the value immediately before the drop of the detected temperature due to the introduction is set as the upper limit after the second introduction of the fried seeds, Even if the difference between the temperature detected by the temperature detecting means and the oil temperature in the cooking container is large before the second fried seed is thrown in, the oil temperature is prevented from stabilizing at a temperature lower than the temperature before the throwing. This has the effect that the oil temperature during cooking can be kept substantially constant.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment.

FIG. 2 is a schematic configuration diagram of the above.

FIG. 3 is an operation explanatory diagram of the above.

FIG. 4 is a diagram showing an example of a change over time of the detected temperature in the above.

FIG. 5 is a schematic configuration diagram of a conventional example.

FIG. 6 is a diagram showing an example of a change over time of the detected temperature in the above.

[Explanation of symbols]

 1a Gas burner 3 Gas supply control device 6 Temperature sensor 7 Control device 10 Temperature adjusting means 11 Set temperature control means 12 Upper and lower limit temperature setting means 14 Speed detecting means 21 Temperature setting means

Claims (1)

[Claims] 1. A heating means for heating a cooking vessel, a heating control means for controlling an amount of heating by the heating means, a temperature detecting means for detecting a temperature of the cooking vessel, and an upper limit and a fixed value smaller than the upper limit. Temperature adjusting means for comparing the lower limit value and the temperature detected by the temperature detecting means, and controlling the heating control means so as to increase the heating amount when the detected temperature is lower than the lower limit value and decrease the heating amount when the detected temperature rises to the upper limit value. A heating cooker provided with a speed detecting means for obtaining a decreasing speed of the temperature detected by the temperature detecting means, and a heating speed immediately before the lowering of the heating amount immediately before the lowering speed obtained by the speed detecting means is equal to or higher than a predetermined speed. A setting temperature control means for setting a peak value of the detected temperature as the upper limit value;