JP2004219029A - Gas stove - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gas stove protecting a temperature sensor to detect temperature of a top plate, and controlling temperature of the top plate. <P>SOLUTION: This gas stove is provided with a burner 2 of a surface combustion type provided to face the top plate 4 in a combustion chamber with subject matter placed on the top pate 4 at an upper surface, combustion gas supply means 14 and 15 supplying fuel gas to the burner 2, an exhaust passage 16 communicated with the combustion chamber at one end, and communicated with an exhaust port 5 at the other end, and a gas supply/discharge fan 6 to supply combustion air to the burner 2, and send combustion exhaust of the burner 2 through the exhaust passage 16 to the exhaust port 5. The subject matter is heated by heat radiation from the burner 2 through the top plate 4. It is also provided with a temperature sensor 17 provided in the exhaust passage 16 to detect temperature of combustion exhaust of the burner 2, and a combustion quantity control means 25 to control temperature of the top plate 4 by changing combustion quantity of the burner 2 based on temperature detected by the temperature sensor 17. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a gas stove in which an object to be heated is placed on an upper surface of a combustion chamber and a flame is not exposed during heating.
[0002]
[Prior art]
Conventionally, as shown in FIG. 5A, the upper surface of a combustion chamber provided with a burner 100 is made of a heat-resistant glass top plate 101, and a cooking utensil placed on the glass top plate 101 is heated. Gas stoves are known (for example, see Patent Document 1). In such a gas stove, the combustion air is supplied to the burner 100 by the air supply / exhaust fan 102, and the combustion exhaust gas from the burner 100 is discharged from the exhaust port 103.
[0003]
FIG. 5B is a cross-sectional view of the gas stove shown in FIG. The controller 130 controls the combustion gas supplied from the gas supply path 121 to the mixing pipe 123 through the nozzle 122 with respect to the target combustion amount of the burner 100 set by the combustion amount adjustment switch 104 for adjusting the combustion amount of the burner 100. Is controlled by the gas proportional valve 124, and the flow rate of the combustion air supplied to the mixing pipe 123 through the air supply passage 120 is controlled by the air supply / exhaust fan 102.
[0004]
Further, a gas supply valve 125 is provided in the gas supply path 121. Further, a gas-permeable porous body 105 is provided inside the burner 100, and the porous body 105 communicates with an exhaust passage 126 that guides the combustion exhaust gas of the burner 100 to the exhaust port 103. By providing the porous body 105 in the exhaust path of the combustion exhaust gas of the burner 100 in this way, in addition to the hot air 111 from the combustion surface of the burner 100 where the combustion flame 110 occurs, the porous body 105 heated by the passage of the high-temperature combustion exhaust gas is provided. Since the radiant heat 112 is also generated from the body 105, the heat efficiency of the gas stove can be increased.
[0005]
Here, the maximum allowable temperature of the surface of the glass top plate 101 is usually between about 700 ° C. and 750 ° C. If the bottom of the cookware used is smooth, heat conduction will be good, but if not, or if cookware without contents is used, the glass The temperature of the top plate 101 may be 900 degrees or more. Therefore, it is conceivable to provide a temperature sensor for detecting the temperature of the glass top plate 101 in the combustion chamber and control the thermal power of the burner 100 so that the temperature of the glass top plate 101 is maintained at a predetermined temperature. However, since the temperature inside the combustion chamber is extremely high (for example, 1000 ° C.), there is a disadvantage that the temperature sensor provided in the combustion chamber is exposed to the high temperature and easily deteriorates.
[0006]
[Patent Document 1]
JP-A-2002-206713 (page 3-4, FIG. 1)
[0007]
[Problems to be solved by the invention]
In view of such a background, an object of the present invention is to provide a gas stove capable of controlling a temperature of a top plate while protecting a temperature sensor for detecting a temperature of the top plate.
[0008]
[Means for Solving the Problems]
The present invention has been made to achieve the above object, and has a surface-burning type burner provided to face a top plate in a combustion chamber in which an object to be heated is placed on the top plate. A fuel gas supply means for supplying fuel gas to the burner, an exhaust passage having one end communicating with the combustion chamber and the other end communicating with an exhaust port, and supplying combustion air to the burner and exhaust gas from the burner. And an air supply / exhaust fan that sends the air to the exhaust port through the exhaust passage, and relates to an improvement in a gas stove that heats an object to be heated via the top plate by radiating heat from the burner.
[0009]
The present inventors have conducted various studies to achieve the above object. As a result, the present inventors have found that when the temperature sensor is disposed in the exhaust passage, a good correlation can be obtained between the surface temperature of the top plate and the temperature detected by the temperature sensor.
[0010]
Therefore, the present invention provides a temperature sensor provided in the exhaust passage, the temperature sensor detecting the temperature of the combustion exhaust gas of the burner, and changing the combustion amount of the burner based on the temperature detected by the temperature sensor. And combustion amount control means for controlling the temperature of the fuel cell.
[0011]
According to the present invention, the temperature sensor is provided in the exhaust passage and detects the temperature of the combustion exhaust gas of the burner. The temperature of the combustion exhaust gas from the burner has a close correlation with the surface temperature of the top plate facing the burner. Therefore, the temperature of the top plate can be controlled by changing the combustion amount of the burner based on the temperature detected by the temperature sensor by the combustion amount control means. Thereby, the temperature of the cooking utensil placed on the top plate can be controlled. By arranging the temperature sensor in the exhaust passage at a lower temperature than the combustion chamber, the temperature sensor can be protected and the life can be extended.
[0012]
Further, the gas stove according to the present invention is characterized in that the temperature sensor is arranged at a position further downstream of the exhaust passage as the thermal conductivity of the top plate is lower.
[0013]
The lower the thermal conductivity of the material forming the top plate, the more difficult it is to heat and cool the top plate, so that the change in the top plate temperature is delayed with respect to the change in the combustion exhaust gas temperature of the burner. This delay increases as the thermal conductivity of the top plate decreases. Therefore, the lower the thermal conductivity of the top plate, the more downstream the temperature sensor is disposed in the exhaust passage. Thus, it is possible to correct the delay of the change of the top plate temperature with respect to the change of the combustion exhaust gas temperature of the burner, and to enhance the correlation between the temperature detected by the temperature sensor and the temperature of the top plate.
[0014]
Further, the gas stove according to the present invention is characterized in that the heat capacity of the temperature sensor is increased as the thermal conductivity of the top plate is lower.
[0015]
The lower the thermal conductivity of the constituent material of the top plate, the more difficult it is to heat and cool the top plate. Therefore, the change in the top plate temperature is delayed with respect to the change in the combustion exhaust gas temperature of the burner. This delay increases as the thermal conductivity of the top plate decreases. On the other hand, the greater the heat capacity of the material constituting the temperature sensor, the greater the delay in the change in the temperature detected by the temperature sensor with respect to the change in the ambient temperature. Therefore, a temperature sensor having a larger heat capacity as the thermal conductivity of the top plate is lower is used. Thus, it is possible to correct the delay of the change of the top plate temperature with respect to the change of the combustion exhaust gas temperature of the burner, and to enhance the correlation between the temperature detected by the temperature sensor and the top plate temperature.
[0016]
In the gas stove according to the present invention, the temperature sensor includes a thermocouple or a thermistor, and a heat capacity is changed by changing a diameter of the thermocouple or thermistor. According to the present invention, when the temperature sensor is a thermocouple or thermistor, its heat capacity can be easily changed by changing the diameter of the thermocouple or thermistor.
[0017]
Further, when the top plate is made of glass, the present invention is applied because glass has a lower thermal conductivity than metal and a change in the top plate temperature with respect to a change in the combustion exhaust gas temperature of the burner is large. Great effect when done.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is an external view of a gas stove of this embodiment, and FIG. 2 is a configuration diagram of the gas stove of this embodiment. Referring to FIG. 1, gas stove 1 is a heat-resistant gas stove located on the upper surface of a combustion chamber in which a surface-burning type burner 2 composed of a ring-shaped burner block 2 a and a burner block 2 b and a porous body 3 are accommodated. A glass top plate 4 and a supply / exhaust fan 6 that supplies combustion air to the burner 2 and sends out the combustion exhaust gas from the burner 2 from the exhaust passage 16 (see FIG. 2) to the exhaust port 5 through the porous body 3. A cooker mounted on the glass top plate 4 comprising a capacity changeover switch 7 for switching the effective heating area of the glass top plate 4 and a combustion amount adjustment switch 8 for adjusting the combustion amount of the burner 2. (The object to be heated).
[0019]
Next, FIG. 2 shows a configuration diagram of the gas stove in the present embodiment, and is a cross-sectional view of the gas stove 1 shown in FIG. 1 as viewed from the side. The combustion air is supplied to the burner 2 through the air supply passage 11 and the air supply branch pipes 12 and 13 branched from the air supply passage 11 by the air supply / exhaust fan 6. Fuel gas is ejected from the provided nozzle 15 into the air supply passage 11. Note that the gas supply pipe 14 and the nozzle 15 constitute a fuel gas supply unit of the present invention.
[0020]
A temperature sensor 17 is provided near the downstream point d of the exhaust passage 16 and detects the temperature of the combustion exhaust gas of the burner 2. The temperature sensor 17 is composed of, for example, a thermocouple or a thermistor.
[0021]
The gas supply pipe 14 is provided with a gas source valve 21 and a gas proportional valve 22 from the upstream side, and the air supply branch pipe 13 is provided with an air supply branch pipe opening / closing valve 23. The operation of the gas stove 1 is controlled by a controller 25 (including the function of the combustion amount control means of the present invention) constituted by a microcomputer or the like.
[0022]
The controller 25 is connected to the capacity changeover switch 7 and the combustion amount adjustment switch 8, and the controller 25 controls the combustion operation of the burner 2 in accordance with the operation of these switches by the user.
[0023]
When the capacity changeover switch 7 is set to “high capacity”, the controller 25 opens both the gas source valve 21 and the supply branch pipe opening / closing valve 23 to burn the burner block 2a and the burner block 2b. . At this time, the combustion exhaust gas of the burner block 2a and the burner block 2b is sucked into the porous body 3, and at that time, the porous body 3 is heated by the high-temperature combustion exhaust gas and glows red. Released. Therefore, the effective heating area is within the range of the diameter L10 formed by the combustion surfaces of the burner blocks 2a and 2b and the radiation surface of the porous body 3.
[0024]
On the other hand, when the capacity changeover switch 7 is set to “small capacity”, the controller 25 opens only the gas source valve 21 and maintains the supply branch pipe opening / closing valve 23 in the closed state, and the burner block 2 a Only burn. Thereby, the effective heating area is within the range of the diameter L20 formed by the combustion surface of the burner block 2a and the radiation surface of the porous body 3 heated by the combustion exhaust gas of the burner block 2a.
[0025]
Accordingly, the user (cooker) of the gas stove 1 operates the capacity changeover switch 7 in this manner, thereby enabling the gas stove 1 to be effective on the glass top plate 4 in accordance with the size of the cooking utensil (the object to be heated) such as a pan. The heating area can be changed.
[0026]
The controller 25 sets the target combustion amount of the burner 2 in accordance with the operation of the capacity changeover switch 7 and the combustion amount adjustment switch 8, and adjusts the rotation speed of the supply / exhaust fan 6 in accordance with the target combustion amount. The supply flow rate of the combustion gas to the burner 2 is controlled, and the opening degree of the gas proportional valve 22 is adjusted with the gas source valve 21 opened to control the supply flow rate of the fuel gas to the burner 2.
[0027]
Next, a method of setting the arrangement position of the temperature sensor 17 used in the gas stove 1 of the present embodiment will be described. The glass constituting the top plate 4 has a lower thermal conductivity than metal, and a response delay occurs between the temperature of the top plate 4 and the temperature of the combustion exhaust gas detected by the temperature sensor 17. Therefore, in the present embodiment, by changing the installation position of the temperature sensor 17, the delay of the change of the top plate temperature with respect to the change of the combustion exhaust gas temperature of the burner 2 is corrected.
[0028]
The present inventors conducted a test for examining an appropriate arrangement position of the temperature sensor 17 in the exhaust passage 16. Specifically, a case where the temperature sensors 17 having a diameter of 5 mm are disposed at the point a near the packing on the back of the glass top plate 4 (see FIG. 2), the upstream point b, the middle stream point c, and the downstream point d of the exhaust passage 16 respectively. With respect to the temperature, the temperature detected by the temperature sensor 17 and the temperature at the center of the glass top plate 4 when the burner 2 burns at a predetermined combustion amount were measured at the time of temperature rise and temperature fall.
[0029]
As a result, at the point a near the packing on the back of the glass top 4, a good correlation was not obtained between the temperature detected by the temperature sensor 17 and the temperature of the glass top 4 at the time of temperature rise and temperature fall. On the other hand, when the temperature sensor 17 is disposed at the upstream point b, the middle flow point c, and the downstream point d of the exhaust passage 16, it is assumed that the temperature sensor 17 has a higher correlation than when the temperature sensor 17 is disposed at the packing vicinity point a. became. FIG. 3 shows the result when the temperature sensor 17 is disposed in the exhaust passage 16.
[0030]
In FIG. 3, the horizontal axis represents the temperature [° C.] of the glass top plate 4, and the vertical axis represents the detected temperature [° C.] of the temperature sensor 17. As shown in FIG. 3, when the temperature of the glass top 4 is up to about 350 ° C., when the temperature sensor 17 is disposed at the downstream point d, the temperature detected by the temperature sensor 17 and the temperature of the glass top 4 are different from each other. Are almost the same. The temperature detected by the temperature sensor 17 becomes higher than the temperature of the top plate 4 as the position at which the temperature sensor 17 is disposed goes upstream. In other words, it can be seen that the delay of the temperature change of the top plate 4 with respect to the change of the temperature detected by the temperature sensor 17 decreases as the arrangement position of the temperature sensor 17 moves downstream.
[0031]
This is because when the arrangement position of the temperature sensor 17 changes, the time until the combustion exhaust gas of the burner 2 reaches the temperature measurement point from the combustion chamber changes, and the degree of the delay in the temperature change changes accordingly. That's why. Therefore, by adapting the arrival time and the delay time of the temperature change of the top plate 4 with respect to the temperature detected by the temperature sensor 17, the delay of the temperature change can be appropriately corrected. The delay time of the temperature change of the top plate 4 with respect to the temperature detected by the temperature sensor 17 increases as the thermal conductivity of the top plate decreases. Therefore, by disposing a temperature sensor 17 downstream of the exhaust passage 16 as the thermal conductivity of the top plate becomes lower, the time required for the combustion exhaust gas to reach the temperature measurement point from the combustion chamber is detected by the temperature sensor 17. By adapting to the delay time of the temperature change of the top 4 with respect to the temperature, the delay of the temperature change can be appropriately corrected.
[0032]
For this reason, in the gas stove 1 of the present embodiment, the temperature sensor 17 is disposed near the downstream point d of the exhaust passage 16 in accordance with the thermal conductivity of the glass top plate 4. Thereby, the response delay of the top plate temperature caused by the thermal conductivity of the glass constituting the top plate 4 can be eliminated, and the temperature of the glass top plate 4 can be accurately controlled based on the temperature detected by the temperature sensor 17. .
[0033]
Next, a gas stove that corrects a delay in a change in the top plate temperature with respect to a change in the combustion exhaust gas temperature of the burner 2 by changing the heat capacity of the temperature sensor 17 will be described as a second embodiment. The gas stove of the present embodiment is the same as that of the first embodiment except for the method of correcting the delay, and the same components are denoted by the same reference numerals and description thereof is omitted.
[0034]
In the above-described first embodiment, the delay in the change of the top plate temperature with respect to the change of the combustion exhaust gas temperature of the burner 2 is corrected by the arrangement position of the temperature sensor 17, but in the second embodiment, the temperature sensor 17 The delay of the temperature change is corrected by the magnitude of the heat capacity. Hereinafter, a method of setting the heat capacity of the temperature sensor 17 will be described. The inventors of the present application performed a test using the temperature sensors 17 having different heat capacities. In this test, three types of temperature sensors 17 having diameters of 2 mm, 5 mm, and 10 mm were prepared, and the magnitude of the heat capacity of the temperature sensor 17 was changed.
[0035]
Regarding the gas stove of the present embodiment, when the respective temperature sensors 17 are disposed at the downstream point d of the exhaust passage 16, the temperature detected by each of the temperature sensors 17 and the glass when the burner 2 burns at a predetermined combustion amount. The temperature at the center of the top plate 4 and the temperature at the time of temperature rise and temperature decrease were measured. The results of this test are shown in FIG.
[0036]
In FIG. 4, the horizontal axis represents the temperature [° C.] of the glass top plate 4, and the vertical axis represents the detected temperature [° C.] of the temperature sensor 17. As shown in FIG. 4, when the diameter of the temperature sensor 17 is 2 mm or 5 mm, the rate of increase in the temperature detected by the temperature sensor 17 is greater than the rate of increase in the temperature of the glass top plate 4 when the temperature rises. The ascending speed is reversed, and the hysteresis caused by the difference is clockwise. On the other hand, when the diameter of the temperature sensor 17 is 10 mm, the rising speed of the detected temperature of the temperature sensor 17 is smaller than the rising speed of the temperature of the glass top plate 4 at the time of heating, and the rising speeds of both are reversed at the time of cooling. Hysteresis caused by the difference is counterclockwise. Also, as the diameter of the temperature sensor 17 increases, the degree of opening of the hysteresis decreases, and the temperature difference between when the temperature rises and when the temperature falls decreases.
[0037]
From FIG. 4, when the temperature is raised, for example, when the glass top plate temperature is 350 ° C., the detection temperature of the temperature sensor 17 is about 520 ° C. when the diameter is 2 mm, about 470 ° C. when the diameter is 5 mm, In the case of 10 mm, the temperature is about 200 ° C. In addition, when the temperature of the glass top plate is lowered from 700 ° C. to, for example, 350 ° C., the temperature sensor 17 decreases the detection temperature by about 460 ° C. when the diameter is 2 mm and about 400 ° C. when the diameter is 5 mm. In the case of 10 mm, the temperature is about 240 ° C. Therefore, as the diameter of the temperature sensor 17 increases, that is, as the heat capacity increases, the delay in the change in the temperature of the glass top plate 4 with respect to the change in the detection temperature of the temperature sensor 17 decreases. It can be seen that the change of the temperature is delayed more than the temperature change of the glass top plate 4.
[0038]
This is because, when the magnitude of the heat capacity of the temperature sensor 17 changes, the sensitivity of the temperature sensor 17 changes accordingly, and the time required for the detected temperature of the temperature sensor 17 to follow the change of the ambient temperature (response time) is increased. This is because the response time changes as the heat capacity changes and the heat capacity increases. Therefore, by adapting this response time to the delay time of the temperature change of the top plate 4 with respect to the temperature detected by the temperature sensor 17, the delay of the temperature change can be appropriately corrected. The delay time of the temperature change of the top plate 4 with respect to the temperature detected by the temperature sensor 17 increases as the thermal conductivity of the top plate decreases. Accordingly, the response time of the temperature sensor 17 and the temperature of the top plate 4 with respect to the temperature detected by the temperature sensor 17 are increased by increasing the diameter of the temperature sensor 17 and increasing the heat capacity as the thermal conductivity of the top plate decreases. The delay of the temperature change can be appropriately corrected by adjusting the delay time of the temperature change.
[0039]
Further, from the test results shown in FIG. 4, in the case of the glass top plate 4, when the diameter of the temperature sensor 17 is an intermediate diameter between those of 5 mm and 10 mm, the difference between the detected temperature and the top plate temperature is obtained. There is a case where the hysteresis caused by the difference between the rising speed at the time of temperature rise and the rising speed at the time of temperature fall becomes linear (straight line E in the figure), and the diameter of the temperature sensor 17 at that time is assumed to be about 7.5 mm. The correlation between the detected temperature of the temperature sensor 17 and the top plate temperature on the straight line E becomes high. Therefore, as described above, by adjusting the response time and the delay time of the temperature change of the top plate 4 with respect to the temperature detected by the temperature sensor 17 to correct the delay of the temperature change, the effect of reducing the hysteresis is also obtained. Can be expected to be obtained.
[0040]
Therefore, in the gas stove 1 of the present embodiment, the temperature sensor 17 having a diameter of 7.5 mm is disposed at the downstream point d of the exhaust passage 16. Thereby, the temperature of the top plate 4 can be accurately controlled based on the temperature detected by the temperature sensor 17.
[0041]
In addition, in order to correct the delay of the change of the top plate temperature with respect to the change of the combustion exhaust gas temperature of the burner, the heat capacity of the temperature sensor 17 is changed according to the thermal conductivity of the top plate, and the arrangement position of the temperature sensor 17 is also changed. You may make it change. In this case, for example, after determining the heat capacity of the temperature sensor 17, by changing the arrangement position, the delay time of the temperature change of the table 4 with respect to the detected temperature of the temperature sensor 17 can be finely adjusted.
[0042]
Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments at all, and it is needless to say that the present invention can be implemented in various modes without departing from the gist of the present invention.
[0043]
For example, in the first and second embodiments, a burner 2 configured by arranging two annular burner blocks 2a and 2b having different diameters around the porous body 3 with the porous body 3 as a center. However, the present invention is applicable to a gas stove having a different number of burner blocks or a gas stove having a different burner block shape. Also, by not providing a plurality of burner blocks as means for changing the effective heating area of the top plate 4, by adjusting the air-fuel ratio supplied to the burner 2 and changing the area of the porous body 3 through which the combustion exhaust gas passes. Alternatively, the effective heating area of the top plate 4 may be changed. In addition, the number and position of the air supply passage 11 and the gas supply pipe 14 and the number and position of the solenoid valves are not limited to those in the above-described embodiment.
[0044]
In addition, as shown in FIGS. 3 and 4, the detection temperature of the temperature sensor 17 and the temperature of the glass top plate 4 have been described as substantially matching, but the detection temperature of the temperature sensor 17 and the temperature of the glass top plate 4 are different. If there is a correlation, the present invention can be applied. The material of the top plate is not limited to glass, but may be metal, for example. The heat capacity and / or the arrangement position of the temperature sensor 17 may be changed according to the thermal conductivity of the material. .
[0045]
Further, in the second embodiment, the size of the heat capacity is changed by changing the diameter of the temperature sensor. For example, a heat insulating material is wound around the temperature sensor, or the temperature sensor is housed in a metal protection tube. The magnitude of the heat capacity may be changed accordingly.
[Brief description of the drawings]
FIG. 1 is an external view of a gas stove according to a first embodiment.
FIG. 2 is a configuration diagram of a gas stove according to the first embodiment.
FIG. 3 is a diagram showing a relationship between a temperature detected by a temperature sensor having a different arrangement position and a temperature of a glass top plate.
FIG. 4 is a diagram illustrating a relationship between a temperature detected by temperature sensors having different diameters and a temperature of a glass top plate.
FIG. 5 is a configuration diagram of a conventional gas stove.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Gas stove, 2 ... Burner, 3 ... Porous body, 4 ... Glass top plate, 5 ... Exhaust port, 6 ... Supply / exhaust fan, 7 ... Capability Changeover switch, 8: combustion amount adjustment switch, 11: air supply passage, 12, 13 ... air supply branch pipe, 14 ... gas supply pipe, 15 ... nozzle, 16 ... exhaust Passages, 17: temperature sensor, 21: gas source valve, 22: gas proportional valve, 23: air supply branch pipe opening / closing valve, 25: controller.

Claims (5)

A surface combustion type burner provided in the combustion chamber in which the object to be heated is placed on the top plate on the top surface, facing the top plate, fuel gas supply means for supplying fuel gas to the burner; An exhaust passage communicating with the combustion chamber and having the other end communicating with the exhaust port, and a supply / exhaust fan that supplies combustion air to the burner and sends out combustion exhaust gas from the burner to the exhaust port via the exhaust passage. A gas stove that heats an object to be heated via the top plate by heat radiation from the burner,
A temperature sensor provided in the exhaust passage and detecting a temperature of the combustion exhaust gas of the burner;
A gas stove comprising: a combustion amount control unit that controls a temperature of the top plate by changing a combustion amount of the burner based on a temperature detected by the temperature sensor. 2. The gas stove according to claim 1, wherein the temperature sensor is disposed at a position further downstream of the exhaust passage as the thermal conductivity of the top plate decreases. 3. The gas stove according to claim 1, wherein the heat capacity of the temperature sensor is increased as the thermal conductivity of the top plate decreases. 4. The gas stove according to claim 3, wherein the temperature sensor is constituted by a thermocouple or a thermistor, and the heat capacity is changed by changing a diameter of the thermocouple or thermistor. The gas stove according to any one of claims 1 to 4, wherein the top plate is made of glass.

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