KR940008244B1 - Heating & cooking apparatus with a temperature sensor - Google Patents

Abstract

The control method prevents automatic fire extinguishing by a temperature cut mode in a shaking state of a cooking pot. In the heat cooking device having a heating device, a switching device and a control device with the temperature sensor, the method includes the steps of: when lapse time from a just before temperature to a high cut temperature is longer than a standard time, judging a usual using state of the cooking pot put over the fire close the gas valve; when the lapse time is shorter than the standard time, judging a shaking of the cooking pot to operate the timer; and when judged the cooking pot is shaken longer than a given time, closing the gas valve.

Description

Control method of heating cooker with temperature sensor

Fig. 1 is a sectional view showing the main part of a table stove with a temperature sensor according to the first embodiment.

2 is a perspective view of a tabletop with a temperature sensor according to the first embodiment.

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

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

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

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

7 is a cross-sectional view showing a modification of the table oven with a temperature sensor.

* Explanation of symbols for main parts of the drawings

1: Table cooker with temperature sensor (heating cooker with temperature sensor)

2: gas burner (heating means) 3: gas supply passage (fuel supply passage)

4 gas valve (opening and closing means) 5 computer (control means)

6: cooking pot 8: temperature sensor

10: measuring circuit (measuring means)

The present invention relates to a control method of a heating cooker equipped with a temperature sensor for sensing the temperature of the cooking pot.

In a conventional heating cooker equipped with a temperature sensor, the temperature sensor is brought into contact with the bottom of the cooking pot to sense the temperature of the cooking pot, and when the temperature detected by the temperature sensor rises above the cut, the shutoff valve is closed to supply fuel. By cutting off the furnace and extinguishing it, there is a setting of a temperature cut mode for the purpose of preventing overheating of cooked foods and overheating of cooking pots due to overheating.

However, in a conventional heating cooker equipped with a temperature sensor, when cooking cooking food while placing the cooking pot, if the burning flame of the burner is shaken due to the shaking of the cooking pot, the sensing temperature of the temperature sensor is cut. There is a possibility of a sudden rise above the temperature.

In this case, even if the temperature of the cooking pot has not yet risen to the cut temperature, there is a problem in that the ease of use of the automatic cut-off by closing the shutoff valve by operating the temperature cut mode.

In this case, when the sensing temperature of the temperature sensor reaches the cut temperature, it is conceivable to extend the operation of the temperature cut mode until a predetermined time (for example, 10 seconds) has elapsed to enable the cooking pot to shake. There is a problem that the cooking pot is delayed until it is not shaken, resulting in sticking of food or overheating of the cooking pot.

The present invention is to automatically determine whether the cooking pot is shaking or not, and when the cooking pot is shaken to prevent automatic fire extinguishing by the temperature cut mode for the purpose of providing a heating cooker with a temperature sensor which improves the convenience of use. do.

The present invention includes heating means for heating a cooking pot by burning fuel; Opening and closing means via a fuel supply path for supplying fuel to the heating means; And a temperature sensor for detecting the temperature of the cooking pot, and when the temperature sensed by the temperature sensor rises above the cut temperature, controlling the opening and closing means to execute a temperature cut mode for cutting off the fuel supply path. It is provided. The control means has measuring means for measuring a temperature rise rate when the temperature sensed by the temperature sensor exceeds the cut temperature, and the temperature rise rate measured by the measuring means is faster than the reference speed. In this case, a means for avoiding the temperature cut mode was employed.

In addition, the present invention, the heating means for heating the cooking pot by burning fuel; Opening and closing means via a fuel supply path for supplying fuel to the heating means; It has a temperature sensor for sensing the temperature of the cooking pot, the temperature sensed by the temperature sensor has a cut temperature, when the temperature sensed by this temperature sensor rises above the cut temperature by controlling the opening and closing means And control means for executing a temperature cut mode for shutting off the fuel supply passage.

The control means has measuring means for measuring a temperature rising speed when the temperature sensed by the temperature sensor exceeds the cut temperature, and the temperature rising speed measured by the measuring means is faster than the reference speed. In this case, technical means for changing the temperature at which the temperature is cut to a temperature higher than the cut temperature is employed.

If the temperature rise rate is higher than the reference speed when the detected temperature by the temperature sensor exceeds the cut temperature, measured by the measuring means, it is determined that the cooking pot is shaken to avoid the temperature cut mode or the temperature cut. Change the temperature at which it runs to a temperature higher than the cut temperature. Therefore, even if the temperature sensed by the temperature sensor rises above the cut temperature, the fuel supply path is not blocked.

The heater with a temperature sensor of the present invention will be described based on the embodiment shown in FIGS. 1 to 4 show a first embodiment of claim 1, in which FIG. 1 is a cross-sectional view showing a main part of a tabletop with a temperature sensor, and FIG. 2 is a table with a temperature sensor. It is a perspective view of the stove.

A table furnace (1) with a temperature sensor, a heater with a temperature sensor of the present invention, comprising a gas burner (2), a gas supply passage (3), a gas valve (4), and a computer (5).

The gas burner 2, as the heating means of the present invention, burns a mixer in which fuel gas and combustion air are mixed to heat the cooking pot 6.

The gas supply passage 3 is a fuel supply passage of the present invention, and supplies fuel gas to the gas burner 2. The gas valve 4 is an opening and closing means of the present invention, is interposed in the gas supply passage 3, and keeps the valve open while energizing (ON) and closes the valve when the energization is stopped (OFF).

The computer 5 is a control means of the present invention, which contacts the bottom surface of the cooking pot 6 with the ignition fire button 7 responsible for igniting the gas burner and adjusts the bottom temperature of the cooking pot 6. A temperature sensor 8 such as a thermistor to detect, a setter for selecting a set and reset of the temperature cut mode and a multistage cut temperature (high cut temperature, high cut temperature and low cut mode) of the temperature cut mode. It is connected to (9).

This computer 5 incorporates a measurement circuit 10. This measuring circuit 10 is a measuring means of the present invention, in which the sensing temperature of the temperature sensor 8 is set to a predetermined temperature (e.g., higher than the high cut temperature of 250 ° C) selected by the setter 9 5 ℃) It is a circuit that calculates the temperature rise rate by measuring the elapsed time (△ t) required to rise from the low immediately before temperature (for example, 245 ℃ when the high cut temperature is 250 ℃) to the high cut temperature.

In addition, when the temperature cut mode is set, the computer 5 shows that when the elapsed time DELTA t is shorter than the reference time (for example, 3 seconds) as shown in the graph of FIG. When it is faster than the standard speed (for example, 5/3 ° C / s), it is determined that the cooking pot is shaken, and a predetermined time from when the sensing temperature of the temperature sensor 8 reaches the high cut temperature (for example, 250 ° C) Only (e.g. for 10 seconds) avoids the temperature cut mode and continues combustion.

Conversely, when the elapsed time Δt becomes longer than the reference time (for example, 3 seconds), that is, when the temperature rise rate is later than the reference speed (for example, 5/3 ° C / s), the cooking pot (6) Is judged to be in normal use, and closes the gas valve 4 when the sensing temperature of the temperature sensor 8 reaches the high cut temperature (for example, 250 ° C.) to automatically extinguish.

Here, according to an experimental result of experimenting with the temperature increase rate of the detected temperature by the temperature sensor 8, the elapsed time (Δt) required for the 5 ° C rise of the detected temperature of the temperature sensor 8, the cooking pot (6) ) It was 3.8 seconds when it was baked without anything inside, and it took more than 3.8 seconds when fried oil was put in the cooking pot (6). In the case where the pot was shaken, the detected temperature of the temperature sensor 8 increased by 5 ° C. or more in general when the elapsed time Δt was less than 1 second.

In addition, the computer 5 performs the above control even when the low cut mode (for example, the low cut temperature is 130 ° C) or the high cut mode (for example, the high cut mode temperature is 290 ° C) is set. .

4 shows an embodiment of the method of the present invention, and is a flowchart 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), control of step S1 is performed.

In step S1, when the temperature cut mode is selected, for example, when the high cut mode (cut temperature 250 ° C.) is set (Yes) among the cut modes, the sensed temperature of the temperature sensor 8 is the immediately preceding temperature (eg For example, it is determined whether the temperature rises above 245 ° C or not (step S2). If the temperature does not rise above the previous temperature (NO), the control of step S1 is performed.

In step S2, when the temperature rises above the immediately preceding temperature (Yes), time measurement is started (step S3), and it is determined whether or not the detected temperature of the temperature sensor 8 rises above the high cut temperature ( Step S4). If the temperature does not rise above the high cut temperature (NO), step S4 is controlled.

In step S4, when the temperature rises above the high cut temperature, that is, when the detected temperature of the temperature sensor 8 exceeds the high cut temperature (YES), the detected temperature of the temperature sensor 8 is the high cut at the previous temperature. The elapsed time required to rise to the temperature is measured (step S5) to determine whether the elapsed time is shorter than the reference time (for example, 3 seconds) (step S6). If the elapsed time is longer than the reference time (NO), it is determined that the cooking pot 6 is in normal use, and the high cut mode is activated to close the gas valve 4 (step S7) to terminate the control. do.

In step S6, if the elapsed time is shorter than the reference time (YES), it is determined that the cooking pot is shaking to start the timer (step S8), and is the sensing temperature of the temperature sensor 8 lowering below the high cut temperature? It is determined whether or not it is (step S9). If the temperature of the cooking pot 6 is lowered and the cooking pot 6 is stopped and it is determined that the cooking pot 6 is placed again (YES), the sensing temperature of the temperature sensor 8 is lower than the previous temperature. (Step S10). If the temperature falls below the immediately preceding temperature (YES), the process returns. If the temperature does not fall below the previous temperature (NO), the control of step S9 is performed.

In step S9, if it is not lowered below the high cut temperature, that is, if it is still determined that the cooking pot is shaking (NO), whether a predetermined time (for example, 10 seconds) has elapsed since the high cut temperature was reached. It is determined whether or not it is (step S11). When the predetermined time has elapsed (YES), that is, when the cooking pot has been shaken for a predetermined time or more, the high cut mode is operated to control step S7.

In step S11, when predetermined time has not passed (NO), control of step S9 is performed.

In addition, even when the low cut mode or the high hi cut mode is set, the low cut temperature (eg 130 ° C.) and the immediately preceding temperature (eg 125 ° C.), the high cut temperature (eg 290 ° C.) and immediately before The above control is performed at a temperature (for example, 285 ° C).

The operation of the table furnace 1 with this temperature sensor will be described based on FIGS. 1 to 3. When the ignition fire extinguishing button 7 is pressed, the gas valve 4 is opened, and at the same time, it is ignited by an ignition device (not shown), and the gas burner 2 starts combustion. In setting the temperature cut mode with the setter 9, a cut temperature such as a high cut mode or a low cut mode is selected according to the type of food.

For example, when the high cut mode is selected, when the cooking pot 6 is heated by the gas burner, the sensing temperature of the temperature sensor 8 exceeds the immediately preceding temperature (for example, 245 ° C.) There may be cases where the cut temperature (eg 250 ° C.) is exceeded.

At this time, the elapsed time required to rise from the immediately preceding temperature (for example, 245 ° C.) to the high cut temperature (for example 250 ° C.) is measured by the measuring circuit 10 of the computer 5. In addition, the temperature rise rate when the elapsed time DELTA t is shorter than the reference time (for example, 3 seconds) by the computer 5, that is, exceeds the high cut temperature (for example, 250 ° C) is the reference speed ( For example, it is determined whether it is faster than 5/3 ° C / s).

When the judgment result is as shown by the line A in FIG. 3, when the elapsed time Δt is shorter than the reference time (for example, 3 seconds), for example, when the elapsed time is Δt = 2, it is faster than the reference speed. It is determined that the cooking pot is shaken, and the temperature cut mode is avoided only for a predetermined time (for example, 10 seconds) from when the high cut temperature is reached.

Therefore, even though the temperature of the cooking pot 6 has not yet risen to the high cut temperature, the sensing temperature of the temperature sensor 8 rises above the high cut temperature due to the shaking of the cooking pot, so that the high cut mode is activated to operate the gas valve ( 4) No automatic fire extinguishing by closing.

That is, since the cooking pot 6 can be moved for a predetermined time (for example, 10 seconds) while the combustion is continued, the convenience of use is improved.

In addition, when the high cut mode is avoided, when the sensing temperature of the temperature sensor 8 falls below the high cut temperature (for example, 250 ° C.) within a predetermined time (for example, 10 seconds), the cooking pot shakes. It stops and determines that cooking pot 6 was put back on, and returns to control by a high cut mode immediately.

When the determination result is that the elapsed time Δt is longer than the reference time (for example, 3 seconds) as in the B line of FIG. 3, for example, when the elapsed time (Δt = 5), the cooking pot 6 is The high cut control is executed immediately upon determination that the vehicle is in normal use, and the gas burner 2 is automatically extinguished by closing the gas valve 4. Therefore, since the overheating of the cooking pot 6 is prevented, stability is excellent.

Also, when the low cut mode is selected, only the low cut temperature (eg 130 ° C.) and the immediately preceding temperature (eg 125 ° C.) are replaced, so that the same control as the high cut mode is performed. Therefore, the cooking pot 6 can be moved for a predetermined time (for example, 10 seconds) while the combustion is continued. In addition, the low cut control is set when the food is prevented from sticking in the stew.

5 is a flowchart showing an example of the operation of the computer 5 as showing the second embodiment of the present invention.

The same control as in the first embodiment is denoted by the same reference numerals and description thereof is omitted.

It is not limited to avoiding the temperature cut mode for only a predetermined time (for example, 10 seconds) from the time when the cut temperature is reached, and in particular, without setting a predetermined time, the cooking pot is stopped and the cooking pot is placed again. The temperature cut may be avoided until it is determined, that is, until it is determined that the temperature falls below the cut temperature.

6 is a flowchart showing an example of the operation of the computer 5 as showing the third embodiment of the present invention.

The same control as in the first embodiment is denoted by the same reference numerals and description thereof is omitted.

In step S6, when the elapsed time is shorter than the reference time (YES), it is determined that the cooking pot is shaken and the timer is started (step S8).

In step S9, when the temperature is not lowered below the high cut temperature, that is, when it is determined that the cooking pot is still shaking (NO), the temperature for executing the temperature cut is raised above the avoiding cut temperature higher than the high cut temperature. If yes (YES), the control in step S7 is performed.

In step S22, when it does not rise above the avoidance cut temperature (NO), it is determined whether the predetermined time has passed (step S23). When the predetermined time has elapsed (YES), step S7 is controlled.

In step S23, when the predetermined time has not elapsed (NO), the temperature at which the temperature is cut is returned to the original high cut temperature (step S24), and the control of step S9 is performed. In addition, it is preferable to set the avoidance cut temperature to an extremely high temperature which is not reached even if there is a shaking of the cooking pot.

In this embodiment, when the temperature detected by the temperature sensor rises from a temperature lower than the cut temperature, the elapsed time required is measured to obtain a temperature rising speed, and the shaking of the cooking pot is determined by comparing with the reference speed. The temperature rises within the reference time (for example, 3 seconds) immediately before reaching the cut temperature is measured. If the temperature rises above the reference rise temperature (for example, 5 ° C), the temperature cut mode is avoided. In this case, the determination may be made based on the temperature rising speed at which the temperature is cut.

The temperature cut mode may be a one-stage cut with only a predetermined temperature (for example, 250 ° C.). The temperature cut mode may or may not be selected. However, the temperature cut mode may be a type in which the temperature cut mode is operated. It may be of a type such that the temperature can be set freely.

In the case of a multi-stage temperature cut mode, only the cut temperature which is the highest temperature (for example, the high cut mode temperature of 290 ° C.) is determined so as not to avoid the temperature cut when it is determined that the cooking pot is shaken. It is possible to reliably prevent damage due to overheating.

In addition, as a method of avoiding temperature cut, the burner may be a small flame when an oil control valve is provided in the fuel supply passage.

In this embodiment, the time for flashing the temperature cut mode is calculated from when the cut temperature is reached. However, the time is not limited to this, but may be calculated from when the previous temperature is reached, for example.

In addition, as a method for determining whether the cooking pot is stopped and the cooking pot has been put back on, as shown in FIG. 7 except for being determined by the detection temperature by the temperature sensor as in the present embodiment, as shown in FIG. When the pot 6 is placed, a limit switch that is turned on (or off) may be provided separately by pressing the temperature sensor 8 downward by the cooking pot 6 which overcomes the elastic force of the spring 11. . According to this method, there is an advantage that it is possible to determine whether the cooking pot 6 is immediately placed again even if the sensing temperature of the temperature sensor 8 does not immediately drop below the cut temperature.

In this embodiment, a gas burner for burning fuel gas is used as the heating means, but a burner for burning liquid fuel may be used, and a thermistor is used as the temperature sensor, but a thermocouple or the like may be used as the temperature sensor.

According to the present invention, when the temperature rise rate when the temperature detected by the temperature sensor exceeds the cut temperature is faster than the reference speed, the cooking pot may be shaken to avoid the determination, the temperature cut mode, or the temperature at which the temperature is cut. Change to a temperature higher than the cut temperature, and continue burning.

On the contrary, if the temperature rise speed when the temperature detected by the temperature sensor exceeds the cut temperature is slower than the reference speed, it is determined that the cooking pot is in normal use, and the opening and closing means are controlled to shut off the fuel supply path. So that the automatic fire extinguishing.

As a result, it is possible to automatically determine whether or not the cooking pot has been placed. Therefore, when the cooking pot is shaken, the temperature cut mode is not activated to automatically extinguish the convenience of use.

Claims (3)

Heating means for heating the cooking pot by burning; Opening and closing means via a fuel supply path for supplying fuel to the heating means; It has a measuring means and a temperature sensor for detecting the temperature of the cooking pot, and when the temperature sensed by the temperature sensor rises above the cut temperature, the temperature cut mode for controlling the opening and closing means to cut off the fuel supply passage In the control method of a heating cooker having a control means, the time measurement is started when the detected temperature of the temperature sensor 8 rises above the immediately preceding temperature in the state that the temperature cut mode is selected, and then the detected temperature exceeds the high cut temperature. If the temperature of the sensor rises from the previous temperature to the high cut temperature, the elapsed time required is measured. If the elapsed time is longer than the reference time, it is determined that the cooking pot (6) is in normal use and the gas valve ( 4) Close, but if the elapsed time is shorter than the reference time, judge that the cooking pot is shaking and start the timer. In addition, it is determined whether the detected temperature of the temperature sensor 8 is lowered below the high cut temperature, and it is determined whether the detected temperature lowered below the high cut temperature is lower than the previous temperature, but not lower than the high cut temperature. If not, if it is determined that the predetermined time has elapsed since the high cut temperature is reached, and the cooking pot is found to be shaking for a predetermined time, the process is performed by closing the gas valve. How to control your cooker. The method according to claim 1, wherein the step of detecting whether the elapsed time is shorter than the reference time so that the sensing temperature of the temperature sensor 8 falls below the high cut temperature is continued until the temperature falls below the high cut temperature. Control method of heating cooker with temperature sensor The method according to claim 1, wherein if it is determined that the cooking pot is still shaking because the temperature is not lower than the high cut temperature, the temperature at which the temperature is cut is set to the avoiding cut temperature higher than the high cut temperature, and is raised above the avoiding cut temperature. If the gas balance is closed but does not rise above the avoiding cut temperature until a predetermined time has elapsed, the control method for a heating cooker with a temperature sensor, characterized in that the temperature for executing the temperature cut is returned to the original high cut temperature. .