JPH0674897B2 - Thermal cooker with temperature sensor - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat cooker with a temperature sensor for detecting the temperature of a cooking pot.

[0002]

2. Description of the Related Art Conventionally, in a thermal cooker with a temperature sensor, when the temperature sensor is brought into contact with the bottom of the cooking pot to sense the temperature of the cooking pot and the temperature sensed by the temperature sensor rises above the cut temperature. There is a type in which a temperature cut mode is set in order to prevent the burning due to overheating and the overheating of the cooking pot by closing the shutoff valve to shut off the fuel supply path and extinguishing the fire.

[0003]

However, in the conventional temperature sensor-added thermal cooker, when the burner combustion flame fluctuates due to the pan swing during cooking, which lifts the cooking pan and stirs the food during use, the temperature sensor There is a possibility that the temperature sensed by will rise above the cut temperature. In that case, even if the temperature of the cooking pot has not yet risen to the cut temperature, the temperature cut mode operates and the shut-off valve closes to automatically extinguish the fire, resulting in inconvenience.

Therefore, it is conceivable to delay the temperature cut until a predetermined time (for example, 10 seconds) elapses after the temperature sensed by the temperature sensor reaches the cut temperature so that the pan can be shaken. There is a problem that it will be delayed until you are not shaking, and that charring and overheating of the cooking pot will progress.

It is an object of the present invention to provide a thermal cooker with a temperature sensor, which automatically determines whether or not a pan is being shaken and prevents automatic fire extinguishing in a temperature cut mode during shaking of the pan to improve usability. And

[0006]

(Means for Solving the Problems) (Claim 1) The present invention comprises:
The temperature sensor has heating means for heating the cooking pot by burning fuel, opening / closing means interposed in a fuel supply path for supplying fuel to the heating means, and a temperature sensor for sensing the temperature of the cooking pot. And a control means for performing a temperature cut mode for controlling the opening / closing means to shut off the fuel supply passage when the temperature sensed by the temperature rises above the cut temperature. When the temperature sensed by the temperature sensor exceeds the cut temperature, the control means has a measuring means for measuring a temperature rising rate, and when the temperature rising rate measured by the measuring means is faster than a reference speed. The technical means for avoiding the temperature cut mode is adopted.

(Claim 2) According to the present invention, a heating means for heating a cooking pot by burning fuel, an opening / closing means interposed in a fuel supply path for supplying fuel to the heating means, and a temperature of the cooking pot. And a control means for controlling the opening / closing means to perform a temperature cut mode for shutting off the fuel supply passage when the temperature sensed by the temperature sensor rises above the cut temperature. . When the temperature sensed by the temperature sensor exceeds the cut temperature, the control means has a measuring means for measuring a temperature rising rate, and when the temperature rising rate measured by the measuring means is faster than a reference speed. The technical means for changing the temperature at which the temperature is cut is higher than the cutting temperature.

[0008]

When the temperature rise rate when the temperature sensed by the temperature sensor measured by the measuring means exceeds the cut temperature is higher than the reference speed, it is determined that the pan is shaking and the temperature cut mode is avoided, or The temperature at which the temperature is cut is changed to a temperature higher than the cutting temperature. Therefore, even if the temperature sensed by the temperature sensor rises above the cut temperature, the fuel supply path is not shut off.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A thermal cooker with a temperature sensor according to the present invention will be described based on the embodiments shown in FIGS. 1 to 4
FIG. 3 is a diagram showing a first embodiment according to claim 1 of the present invention. FIG. 1 is a cross-sectional view showing a main part of a table cooker with a temperature sensor, and FIG. 2 is a perspective view showing a table cooker with a temperature sensor.

The table cooker 1 with a temperature sensor is a temperature sensor-added heat cooker according to the present invention, and includes a gas burner 2, a gas supply passage 3, a gas valve 4 and a computer 5.

The gas burner 2 is the heating means of the present invention, and heats the cooking pot 6 by burning a mixture of fuel gas and combustion air. The gas supply passage 3 is the fuel supply passage of the present invention, and supplies the fuel gas to the gas burner 2. The gas valve 4 is the opening / closing means of the present invention, and is interposed in the gas supply passage 3 to hold the valve open during energization (ON).
The valve closes when the power is turned off.

The computer 5 is the control means of the present invention, and is a fire extinguishing button 7 for controlling ignition and extinguishing of the gas burner 2.
And a temperature sensor 8 such as a thermistor for detecting the temperature of the bottom surface of the cooking pot 6 by contacting the bottom surface of the cooking pot 6, selection and reset of the temperature cut mode, and multi-step cut temperatures of the temperature cut mode ( It is connected to a setting device 9 for arbitrarily selecting a high cut temperature, a high high cut temperature and a low cut temperature.

The computer 5 has a measuring circuit 10 built therein. The measuring circuit 10 is the measuring means of the present invention, and the temperature just before the temperature sensed by the temperature sensor 8 is lower than the cut temperature (for example, high cut temperature 250 ° C.) selected by the setter 9 by a predetermined temperature (for example, 5 ° C.) ( For example, it is a circuit that obtains the temperature rise rate by measuring the elapsed time (Δt) required to rise from 245 ° C. when the high cut temperature is 250 ° C. to the high cut temperature.

Further, the computer 5, when the temperature cut mode is set, as shown in the graph of FIG. 3, when the elapsed time (Δt) is shorter than the reference time (for example, 3 seconds), that is, the temperature rises. When the speed is faster than the reference speed (for example, 5/3 ° C./s), it is determined that the pan is shaking, and the temperature sensed by the temperature sensor 8 is the high cut temperature (for example, 250).
(° C) is reached, the temperature cut mode is avoided for a predetermined time (for example, 10 seconds), and combustion is continued.

On the contrary, when the elapsed time (Δt) is longer than the reference time (for example, 3 seconds), that is, when the temperature rising speed is slower than the reference speed (for example, 5/3 ° C./s), the cooking pot 6 When the temperature detected by the temperature sensor 8 reaches the high cut temperature (for example, 250 ° C.), it is determined that the gas sensor 4 is in normal use and the gas valve 4 is closed to automatically extinguish the fire.

Here, according to the result of an experiment in which the temperature rise rate of the temperature sensed by the temperature sensor 8 is tested, the cooking pot 6 is cooked for the elapsed time (Δt) required for the temperature sensed by the temperature sensor 8 to rise by 5 ° C. When it is done, it is 3.8 seconds, and the cooking pot 6
If oil etc. is inside, it will take more than 3.8 seconds. In the case of shaking the pot, generally, the temperature sensed by the temperature sensor 8 rises by 5 ° C. or more when the elapsed time (Δt) is less than 1 second.

The computer 5 has a low cut mode (for example, a low cut temperature of 130 ° C.) or a high high cut mode (for example, a high high cut temperature of 290 ° C.).
When set to, the same control is performed.

FIG. 4 is a flow chart showing an example of the operation of the computer 5. First, it is determined whether or not the temperature cut mode is set (step S1). When the temperature cut mode is not set (No), the control of step S1 is performed.

In step S1, when the temperature cut mode is selected and, for example, the high cut mode (cut temperature 250 ° C.) is set (Yes), the temperature sensed by the temperature sensor 8 is the immediately preceding temperature (eg 245 ° C.). It is determined whether or not it has risen above (step S2). When the temperature has not risen above the immediately preceding temperature (No), step S1
Control.

In step S2, when the temperature has risen above the previous temperature (Yes), time measurement is started (step S3), and it is checked whether the temperature sensed by the temperature sensor 8 has risen above the high cut temperature. Judge (step S
4). Does not rise above the high cut temperature (No)
At this time, the control of step S4 is performed.

In step S4, when the temperature exceeds the high cut temperature, that is, when the temperature sensed by the temperature sensor 8 exceeds the high cut temperature (Yes), the temperature sensed by the temperature sensor 8 rises from the immediately preceding temperature to the high cut temperature. The elapsed time required to do so is measured (step S5), and it is determined whether the elapsed time is shorter than the reference time (for example, 3 seconds) (step S6). When the elapsed time is longer than the reference time (No), it is determined that the cooking pot 6 is placed in normal use, the high-cut mode is activated, the gas valve 4 is closed (step S7), and the control ends. .

In step S6, when the elapsed time is shorter than the reference time (Yes), it is determined that the pan is swinging, the timer is started (step S8), and the temperature sensed by the temperature sensor 8 falls below the high cut temperature. It is determined whether or not (step S9). When it is determined that the temperature has fallen below the high cut temperature, the pan swing is stopped, and the cooking pot 6 is placed again (Yes), it is determined whether the temperature sensed by the temperature sensor 8 has fallen below the immediately preceding temperature (step). S1
0). When the temperature is lower than the immediately preceding temperature (Yes), the process returns, and when the temperature is not lower than the immediately preceding temperature (No), the control of step S9 is performed.

In step S9, when the temperature has not dropped below the high cut temperature, that is, when it is determined that the pan is still being shaken (No), a predetermined time (for example, 10 seconds) has elapsed from when the high cut temperature was reached. It is determined whether or not (step S11). When the predetermined time has elapsed (Yes), that is, when the pan is shaken for the predetermined time or more, the high cut mode is activated and the control of step S7 is performed.

In step S11, when the predetermined time has not elapsed (No), the control of step S9 is performed. Even when the low-cut mode or the high-high cut mode is set, the low-cut temperature (for example, 130 ° C.) and the immediately preceding temperature (for example, 125 ° C.), the high-high cut temperature (for example, 290 ° C.) and the immediately preceding temperature (for example, 285 ° C.)
The same control is performed as.

The operation of the table stove 1 with the temperature sensor will be described with reference to FIGS. The gas valve 4 is opened by pressing the point extinguishing button 7, and when the ignition is performed by an ignition device (not shown), the gas burner 2 starts combustion. In addition, the temperature cut mode is set by the setting device 9, and the cut temperature such as the high cut mode or the low cut mode is selected according to the type of food.

The case where the high-cut mode is selected will be described. When the cooking pot 6 is heated by the gas burner 2, the temperature sensed by the temperature sensor 8 is the previous temperature (for example, 2).
High cut temperature (eg 250)
C.) may occur.

At this time, the measuring circuit 10 of the computer 5
Measures the elapsed time required to rise from the immediately preceding temperature (for example, 245 ° C.) to the high cut temperature (for example, 250 ° C.). Further, whether or not the elapsed time Δt is shorter than the reference time (for example, 3 seconds) by the computer 5, that is, the temperature rising speed when the high cut temperature (for example, 250 ° C.) is exceeded is the reference speed (for example, 5/3 ° C./s). It is determined whether or not it is faster.

When the elapsed time Δt is shorter than the reference time (for example, 3 seconds) as shown by the line A in FIG. 3, for example, when the elapsed time is Δt = 2 seconds, it is faster than the reference speed. The temperature cut mode is avoided for a predetermined time (for example, 10 seconds) after the determination is made and the high cut temperature is reached.

Therefore, although the temperature of the cooking pot 6 has not risen to the high-cut temperature yet, the temperature sensed by the temperature sensor 8 rises above the high-cut temperature due to the shaking of the pot, the high-cut mode is executed, and the gas valve 4 is closed. It will no longer be fired and extinguished automatically. That is, the pot can be shaken for a predetermined time (for example, 10 seconds) while continuing the combustion, so that the usability is improved.

When the high cut mode is avoided, the temperature sensor 8 is turned on within a predetermined time (for example, 10 seconds).
When the sensed temperature of 1 has fallen below the high cut temperature (for example, 250 ° C.), it is determined that the cooking pan 6 has been placed again after the pan swing is stopped, and control immediately proceeds to the high cut mode.

When the determination result is as shown by the line B in FIG. 3 and the elapsed time Δt is longer than the reference time (for example, 3 seconds), for example, when the elapsed time is Δt = 5 seconds, the cooking pot 6 is placed. Immediately after normal use is determined, high-cut control is performed, the gas valve 4 is closed, and the gas burner 2 is automatically extinguished. For this reason, the cooking pot 6 is prevented from overheating and is excellent in safety.

Even when the low-cut mode is selected, similar control is performed with the low-cut temperature (for example, 130 ° C.) and the immediately preceding temperature (for example, 125 ° C.) replaced.
It is possible to shake the pot for a predetermined time (for example, 10 seconds) while continuing the combustion. The low-cut control is set to prevent burning in water dishes.

FIG. 5 shows a second embodiment according to claim 1 of the present invention. 9 is a flowchart showing an example of the operation of the computer 5. The same controls as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

It is not limited to avoiding the temperature cut mode only for a predetermined time (for example, 10 seconds) after reaching the cut temperature,
The temperature cut may be avoided until the cooking pan is determined to have been placed by stopping the swinging of the pan, that is, until it is determined that the cooking temperature has dropped below the cut temperature, without particularly setting a predetermined time.

FIG. 6 shows a third embodiment according to claim 2 of the present invention. 9 is a flowchart showing an example of the operation of the computer 5. The same controls as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

When the elapsed time is shorter than the reference time (Yes) in step S6, it is determined that the pan is swinging, and the timer is started (step S8).

Then, in step S9, when the temperature is not lower than the high cut temperature, that is, when it is determined that the pan is still being shaken (No), the temperature for performing the temperature cut is set to the avoiding cut temperature (higher than the high cut temperature). Eg 3
The temperature is changed to 00 ° C. (step S21). Then, it is determined whether or not the temperature sensed by the temperature sensor 8 has risen above the avoidance cut temperature (step S22). When the temperature is above the avoidance cut temperature (Yes), step S7
Control.

In step S22, when the temperature has not risen above the avoidance cut temperature (No), it is determined whether or not a predetermined time has elapsed (step S23). When the predetermined time has elapsed (Yes), the control of step S7 is performed.

In step S23, when the predetermined time has not elapsed (No), the temperature for temperature cutting is returned to the original high cut temperature (step S24), and step S9 is performed.
Control. In addition, it is desirable to set the avoidance cut temperature to an extremely high temperature that does not reach even if the pan is shaken.

(Modification) In the present embodiment, the temperature rise rate is obtained by measuring the elapsed time required for the temperature sensed by the temperature sensor to rise from a temperature lower than the cut temperature to the cut temperature, and the obtained temperature rises as the reference speed. Judgment was made by comparing, but not limited to this, the temperature risen within the reference time (eg 3 seconds) immediately before reaching the cut temperature was measured, and if it was higher than the reference rise temperature (eg 5 ° C), the temperature was increased. The cut mode may be avoided, and if it is small, a temperature kert may be executed to make the determination based on the temperature rise rate.

The temperature cut mode may be a one-step cut only at a predetermined temperature (for example, 250 ° C.), the presence or absence of the temperature cut mode cannot be selected, and the temperature cut mode may always work. It may be a type that can be set to any temperature.

In the case of a plurality of stages of temperature cut, the highest cut temperature (for example, high-high cut temperature 290 ° C.)
Only with respect to the above, if the temperature cut avoidance is not performed when it is determined to be the pan swing of the present invention, damage due to overheating of the appliance can be prevented without fail.

Further, as a method of avoiding the temperature cut, the burner may be set to a small fire when the flow rate adjusting valve is provided in the fuel supply passage.

In the present embodiment, the time for avoiding the temperature cut mode is calculated when the cut temperature is reached, but the time is not limited to this and may be calculated, for example, when the immediately preceding temperature is reached.

As a method for determining whether or not the cooking pot has been placed again by stopping the swinging of the pot, other than the method of determining the temperature sensed by the temperature sensor as in this embodiment,
As shown in FIG. 7, when the cooking pot 6 is placed, the limit switch that turns on (or turns off) by overcoming the elastic force of the spring 11 and pushing down the temperature sensor 8 by the cooking pot 6 is separately provided. Is also good. According to this method, even if the temperature sensed by the temperature sensor 8 does not immediately drop below the cut temperature, it is possible to immediately determine whether or not the cooking pot 6 has been placed again.

In this embodiment, the gas burner which burns the fuel gas is used as the heating means, but a burner which burns the liquid fuel may be used. Although a thermistor is used as the temperature sensor in this embodiment, a thermocouple or the like may be used as the temperature sensor.

[0047]

According to the present invention, when the temperature rising rate when the temperature sensed by the temperature sensor exceeds the cut temperature is faster than the reference speed, it is judged as a pan swing and the temperature cut mode is avoided, or the temperature cut mode is set higher than the cut temperature. The combustion is continued by changing the temperature at which the temperature is cut to a higher temperature.

On the contrary, when the temperature rising speed when the temperature sensed by the temperature sensor exceeds the cut temperature is slower than the reference speed, it is determined that the cooking pot is normally used and the opening / closing means is controlled. Cut off the fuel supply path to extinguish automatically.

As a result, it is possible to automatically determine whether or not the pan is being shaken, so that the temperature cut mode does not work to automatically extinguish the fire while the pan is being shaken, and the usability is improved.

[Brief description of drawings]

FIG. 1 is a sectional view showing a main part of a table cooker with a temperature sensor according to a first embodiment.

FIG. 2 is a perspective view showing a table cooker with a temperature sensor according to the first embodiment.

FIG. 3 is a graph showing the relationship between the temperature of a cooking pot and the elapsed time.

FIG. 4 is a flowchart showing the operation of the computer according to the first embodiment.

FIG. 5 is a flowchart showing the operation of the computer according to the second embodiment.

FIG. 6 is a flowchart showing the operation of the computer according to the third embodiment.

FIG. 7 is a cross-sectional view showing a modified example of the table cooker with the temperature sensor.

[Explanation of symbols]

1 table cooker with temperature sensor (heat cooker with temperature sensor) 2 gas burner (heating means) 3 gas supply path (fuel supply path) 4 gas valve (opening and closing means) 5 computer (control means) 6 cooking pot 8 temperature sensor 10 measurement Circuit (measuring means)

Claims (2)

[Claims] 1. A heating means for heating a cooking pot by burning fuel, an opening / closing means interposed in a fuel supply path for supplying fuel to the heating means, and a temperature sensor for sensing the temperature of the cooking pot. And a control means for performing a temperature cut mode for controlling the opening / closing means to shut off the fuel supply path when the temperature sensed by the temperature sensor rises above the cut temperature, the control means comprising: It has a measuring means for measuring a temperature rising rate when the temperature sensed by the temperature sensor exceeds the cut temperature, and avoids the temperature cut mode when the temperature rising rate measured by the measuring means is faster than a reference speed. A heat cooker with a temperature sensor, characterized in that 2. A heating means for heating a cooking pot by burning fuel, an opening / closing means interposed in a fuel supply path for supplying fuel to the heating means, and a temperature sensor for sensing the temperature of the cooking pot. And a control means for performing a temperature cut mode for controlling the opening / closing means to shut off the fuel supply path when the temperature sensed by the temperature sensor rises above the cut temperature, the control means comprising: When the temperature sensed by the temperature sensor exceeds the cut temperature, the temperature rise rate is measured, and when the temperature rise rate measured by the measuring means is higher than the reference speed, the temperature is higher than the cut temperature. A thermal cooker with a temperature sensor, characterized in that the temperature at which the temperature is cut is changed.