JP4410363B2 - Gas stove combustion control device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas stove combustion control apparatus that adjusts the heating power so as to prevent a flame from overflowing from the surroundings of a cooking vessel in a household gas stove.
[0002]
[Prior art]
A general gas stove is configured so that the user can manually adjust the burner's heating power. Therefore, in a state where a cooking container such as a pot or a kettle is placed on the five virtues, the flame may overflow from the surroundings of the cooking container depending on how the heating power is adjusted. For example, if the heating power is set large relative to the bottom area of the cooking container, or if the center of the cooking container is displaced with respect to the center of the burner, the flame will overflow from the periphery of the cooking container. become. When the flame overflows around the cooking container in this way, a part of the flame is not used for heating the cooking container, and energy is wasted, and the flame overflowing around the cooking container The pan handle can be overheated or even accidentally scorched the sleeves of the clothes.
[0003]
In order to solve this type of problem, as described in JP-A-9-53827 and JP-A-9-264538, a means for detecting the size of the pan is provided, depending on the detected size. Some have been proposed to adjust the firepower.
[0004]
In the technique described in Japanese Patent Laid-Open No. 9-53827, a bar-shaped pan diameter detection sensor that can move up and down is provided at a position different from the center of the burner, and when the pan is placed on the five virtues, When pressed down, it is judged as a large-diameter pan, and if the pan-diameter detection sensor is not pushed down, it is judged as a small-diameter pan smaller than the predetermined diameter. The configuration is also reduced. This configuration prevents the flame from protruding significantly on the outer surface of the pan.
[0005]
Moreover, in the technique described in JP-A-9-264538, a plurality of temperature sensors or oxygen concentration sensors are arranged in the radial direction, and a plurality of rows are provided by changing the positions in the circumferential direction. A configuration for detecting the size is adopted. Depending on the position of the pan detected in this way and the size of the pan, the upper limit of the heating power is adjusted so that the flame does not protrude outside the pan bottom.
[0006]
[Problems to be solved by the invention]
By the way, in the technique described in Japanese Patent Laid-Open No. 9-53827, since a mechanical pan diameter detection sensor that moves up and down is used, the pan diameter detection sensor moves when the pan is placed on the five virtues. Discomfort may be caused by the frictional sound associated with, and the failure rate may increase due to the presence of moving parts. In addition, since the pan diameter detection sensor moves downward when a large-diameter pan is placed on the Gotoku, a part of the pan diameter detection sensor always protrudes upward from the Gotoku, There is also a problem that the pan diameter detection sensor becomes an obstacle when the pan is shaken due to the presence of the pan diameter detection sensor at a position that directly hits the pan during cooking.
[0007]
In the technique described in Japanese Patent Application Laid-Open No. 9-264538, a temperature sensor or an oxygen concentration sensor is used to detect the temperature of the exhaust gas and the oxygen concentration in the exhaust gas. The position and size of the pan cannot be detected. In other words, a large flame may be generated at the time of ignition or the flame may overflow to the outer surface of the pan. Moreover, since the temperature sensor and the oxygen concentration sensor are disposed below the pan, the temperature sensor and the oxygen concentration sensor may become dirty due to boiling, and the pan may not be detected.
[0008]
The present invention has been made in view of the above-mentioned reasons, and since there is no movable part or a part that directly contacts the cooking container, the failure rate is low and does not disturb cooking, and cooking is performed before the ignition of the burner. An object of the present invention is to provide a gas stove combustion control device that can detect a container and is not easily affected by spilling.
[0009]
[Means for Solving the Problems]
The invention according to claim 1 has a comparatively large diameter by detecting the presence or absence of a heating container that is disposed at a predetermined distance from the center of the burner and a heating power adjusting means that adjusts the heating power of the burner that burns fuel gas. Non-contact-type object sensor that detects large cooking containers but does not detect cooking containers with relatively small diameters, and adjusts the heating power so that the upper limit of the burner's heating power when detecting non-detection of cooking containers by the object sensor is smaller than the detection time Control means for instructing the means.
[0010]
According to a second aspect of the present invention, in the first aspect of the invention, when the cooking container is not detected by the object sensor immediately before the burner is ignited, the amount of fuel gas supplied to the burner is made smaller than when the cooking container is detected. It is characterized by igniting.
[0011]
According to a third aspect of the present invention, in the first or second aspect of the present invention, the time from when the object sensor intermittently transmits an ultrasonic wave until the reflected wave is received after the ultrasonic wave is transmitted. It is an ultrasonic sensor which judges that a cooking container exists when it is in a regulation range, It is characterized by the above-mentioned.
[0012]
The invention according to claim 4 includes a thermal power adjusting means for adjusting the thermal power of the burner for burning the fuel gas, and three or more measuring devices for detecting the distance to the outer surface of the cooking container disposed at least at three locations around the burner. A position sensor for detecting the size of the cooking container and the displacement of the center of the cooking container relative to the center of the burner based on the relationship between the distance sensor and the distance to the cooking container detected by each distance measuring sensor; Control means for instructing the heating power adjusting means to reduce the upper limit of the burning power of the burner as the minimum distance to the outer surface of the cooking container is smaller.
[0013]
According to a fifth aspect of the present invention, in the invention of the fourth aspect, when the cooking container is not detected by the distance measuring sensor immediately before the ignition of the burner, the amount of fuel gas supplied to the burner is made smaller than that at the detection of the cooking container. The burner is ignited.
[0014]
The invention according to claim 6 is characterized in that, in the invention of claim 4, when the cooking container is not detected by the distance measuring sensor immediately before ignition of the burner, the burner is not ignited.
[0015]
According to a seventh aspect of the present invention, in the invention of the fourth to sixth aspects, the time until the distance measuring sensor intermittently transmits an ultrasonic wave and receives the reflected wave from the transmission of the ultrasonic wave is determined. It is an ultrasonic sensor which calculates | requires the distance to a cooking container by converting into distance.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
(Embodiment 1)
This embodiment demonstrates the structural example which discriminate | determines the magnitude | size of a cooking container by using the ultrasonic sensor which detects the presence or absence of the cooking container immediately above.
[0017]
The gas stove shown in FIG. 2 is a two-port type provided with two burners (not shown), and a circular opening 3 corresponding to each burner is formed in the top plate 2 of the stove main body 1. A juice pan 4 is disposed in each opening 3 so as to surround the burner. The opening 3 is provided with five virtues 6 on which a cooking container 5 (see FIG. 1) such as a pot or kettle is placed. An ultrasonic sensor 7 is disposed on the soup pan 4 at a predetermined distance from the center of the burner (that is, the center of the opening 3). The position where the ultrasonic sensor 7 is disposed is set to an appropriate position between the circumference passing through the innermost end of the virtues 6 and the circumference passing through the outermost end. However, the relative position between the virtues 6 and the ultrasonic sensor 7 is set so that the virtues 6 do not overlap immediately above the ultrasonic sensor 7.
[0018]
The ultrasonic sensor 7 used in the present embodiment is an object sensor that detects the presence / absence of an object within a predetermined distance range. The ultrasonic sensor 7 intermittently transmits ultrasonic waves, and has a specified time set after the ultrasonic waves are transmitted. The presence or absence of an object within a predetermined distance range is detected depending on whether or not a reflected wave is received within the range.
[0019]
As described above, the ultrasonic sensor 7 of the present embodiment detects the presence or absence of the cooking container 5 immediately above, and the cooking container 5 having a circular flat bottom is placed on the five virtues 6 and the center of the burner and the cooking are prepared. If it is assumed that the center of the container 5 is substantially coincident, the cooking container 5 having a relatively large diameter (hereinafter referred to as the large-diameter container 5a) is positioned immediately above the ultrasonic sensor 7 as shown in FIG. However, as shown in FIG. 1B, the cooking container 5 having a relatively small diameter (hereinafter referred to as the small-diameter container 5b) is not positioned directly above the ultrasonic sensor 7. Therefore, by using the ultrasonic sensor 7 for detecting the presence or absence of an object within a distance range including the distance between the cooking container 5 placed on the virtues 6 and the ultrasonic sensor 7, as shown in FIG. It is possible to detect the large-diameter container 5a (shown as a in FIG. 2) and not detect the small-diameter container 5b shown in FIG. 1 (b) (or shown as b in FIG. 2).
[0020]
By the way, the heating power of the burner can be adjusted by a heating power adjusting operation unit 8 as shown in FIG. The thermal power adjustment operation unit 8 includes an on / off operation unit 8a that alternately selects ignition and extinguishing of the burner, a pair of increase / decrease operation units 8b and 8c that gradually change the burner thermal power, and increase / decrease operation units 8b and 8c. And a display 8d for displaying the thermal power set by. The on / off operation unit 8a and the increase / decrease operation units 8b and 8c are operation units to be pushed. When the increase / decrease operation unit 8b is pushed, the heating power increases by one step, and when the increase / decrease operation unit 8c is pushed, the heating power is reduced. Decrease by one level. The amount of change in thermal power in one stage is set appropriately. The indicator 8d is configured by arranging a plurality (five in the illustrated example) of light emitting diodes in a straight line, and the number of lighting increases as the heating power increases. For example, only one light emitting diode is lit at the minimum heating power, and the number of lighting is sequentially increased from the left light emitting diode as the heating power increases. Therefore, in this embodiment, a thermal power increases in five steps.
[0021]
As shown in FIG. 4, the thermal power adjustment operation unit 8 is mounted on the temperature adjustment operation board 11 together with the circuit unit, and the temperature adjustment operation board 11 is connected to the control circuit 10 as a control unit together with the ultrasonic sensor 7. The control circuit 10 controls a safety valve 12 inserted in the fuel gas supply path to the burner and a temperature control valve 13 as a heating power adjusting means, and opens the safety valve 12 when the burner is ignited and closes the safety valve 12 when the fire is extinguished. To do. As the temperature control valve 13, a required number of sets of orifices and solenoid valves (latch valves) are provided, and the flow rate of the fuel gas is changed stepwise by opening and closing each solenoid valve. The above-described increase / decrease operation units 8b and 8c adjust the opening amount of the temperature control valve 13. A switch 14 as an instrument plug is inserted between the control circuit 10 and the power source B. When the switch 14 is turned on, the control circuit 10 is energized and the safety valve 12 is opened. When the switch 14 is turned on, power is also supplied to the igniter 15, and the igniter 15 is activated to ignite the burner. In the present embodiment, the switch 14 is turned on and off by the on / off operation unit 8a described above.
[0022]
Here, the control circuit 10 enables the temperature control valve 13 to be opened to the maximum when the cooking container 5 is detected by the ultrasonic sensor 7, and opens the temperature control valve 13 when the cooking container 5 is not detected by the ultrasonic sensor 7. Limit the upper limit of the amount. That is, the heating power increases step by step for each pressing operation of the increase / decrease operation unit 8 b in the heating power adjustment operation unit 8 provided on the temperature control operation board 11, but the maximum heating power when the cooking container 5 is not detected by the ultrasonic sensor 7. Is limited. In this embodiment, the heating power can be adjusted in five stages. When the cooking container 5 is detected by the ultrasonic sensor 7, the heating power can be increased until all the light emitting diodes are turned on. When the cooking container 5 is not detected by the above, for example, the heating power for lighting three light emitting diodes becomes the upper limit. In the present embodiment, the opening amount of the temperature control valve 13 at the time of ignition is adjusted according to whether or not the cooking container 5 is detected by the ultrasonic sensor 7 even at the time of ignition. That is, if the large-diameter container 5a is determined before ignition after the switch 14 is turned on, the opening amount of the temperature control valve 13 is increased, and if the small-diameter container 5b is determined, the opening amount of the temperature control valve 13 is increased. Make it smaller. Therefore, when the cooking container 5 is not placed on the virtues 6 at the time of ignition, a large flame does not occur, and the danger of a large flame suddenly occurring at the time of ignition can be avoided.
[0023]
The operation of this embodiment will be described below. As shown in FIG. 5, when the switch 14 as an appliance plug is turned on by the operation of the on / off operation unit 8a (S1), the size of the cooking container 5 such as a pan is set by the ultrasonic sensor 7 before the burner is ignited. It is determined (S2). Depending on whether the cooking container 5 is a large-diameter container 5a or a small-diameter container 5b, the opening amount of the temperature control valve 13 is adjusted (S3, S4), and then an ignition spark is generated by the igniter 15 (S5). ). When ignition of the burner is confirmed in this way (generally, a temperature change around the burner is detected using a thermocouple) (S6), the size of the cooking container 5 is determined again (S7), and the size of the cooking container 5 is determined. The upper limit value of the thermal power according to is set (S8, S9). Thereafter, combustion of the burner is continued (S10), and when cooking is completed, the on / off operation portion 8a is pushed to turn off the switch 14 which is an appliance plug (S11). As described above, in this embodiment, the size of the cooking container 5 is determined immediately before and after the burner is adjusted, and the opening amount of the temperature control valve 13 at the time of ignition is adjusted, and the upper limit of the thermal power at the time of combustion is adjusted. Set the value.
[0024]
However, since there is a case where it is desired to cancel the setting of the thermal power regardless of the size of the cooking container 5 by replacing the cooking container 5 during combustion of the burner, the thermal power control unit 8 includes a reset operation unit (not shown). Is provided, and the setting of the thermal power according to the presence or absence of detection of the cooking container 5 by the ultrasonic sensor 7 can be canceled. The setting of the thermal power is canceled only during the ignition of the burner. After the fire is extinguished, the thermal power is set again when the ignition is performed next time.
[0025]
In the above configuration example, the flow rate of the fuel gas is changed stepwise by using an electromagnetic valve as the temperature control valve 13. However, the flow rate of the fuel gas is changed by using an electric valve (motor valve) as the temperature control valve 13. You may employ | adopt the structure changed continuously. In the above-described embodiment, only one ultrasonic sensor 7 as an object sensor is arranged. However, if a plurality of ultrasonic sensors 7 are arranged in the radial direction of the cooking container 5, the size of the cooking container 5 is increased. It is possible to detect the height in a plurality of stages.
[0026]
(Embodiment 2)
In this embodiment, as shown in FIG. 6 and FIG. 7, three or more ultrasonic sensors 21 as distance measuring sensors capable of detecting the distance from the outer surface of the cooking vessel 5 around the burner (illustrated example) 4). Each ultrasonic sensor 21 is attached to an upper end portion of a support column 22 erected on the upper surface of the top plate 2, and is arranged so as to detect a distance from the cooking container 5 in a direction along the upper surface of the top plate 2. Furthermore, each ultrasonic sensor 21 is arranged so that the direction in which ultrasonic waves are transmitted and received intersects on the center of the burner. Since the distance from the ultrasonic sensor 21 to the center of the burner is known in a plane including the ultrasonic sensor 21 and parallel to the upper surface of the top plate 2, the distance from the ultrasonic sensor 21 to the outer surface of the cooking container 5 is determined. For example, the distance from the center position of the burner to the outer surface of the cooking container 5 can be known. This calculation is performed in the control circuit 10 serving as position detecting means.
[0027]
The basic operation of the ultrasonic sensor 21 used in this embodiment is the same as that of the ultrasonic sensor 7 used in the first embodiment, but it is not an object sensor that simply detects the presence or absence of an object, but can detect the distance to the object. A ranging sensor is used. That is, the ultrasonic sensor 21 in the present embodiment also transmits ultrasonic waves intermittently, and after transmitting the detection wave Wd as shown in FIG. 9A, as shown in FIG. 9B. The time tp until the reflected wave Wr reflected by the object is received is converted into the distance to the object. Here, the time until the reflected wave Wr is received after the detection wave Wd is transmitted is roughly determined by the position of the ultrasonic sensor 21 and the diameter of the cooking container 5, and therefore, the other ultrasonic sensors 21. In order to remove the influence of ultrasonic waves from the sound waves, the influence of multiple reflections of ultrasonic waves, etc., a time range (so-called reception gate period) for receiving the reflected wave Wr after transmitting the detection wave Wd is set. . In the ultrasonic sensor 21 having such a configuration, the distance to the object is ideally expressed as tp · c / 2 using the time tp from the transmission to the reception and the sound velocity c. Here, although the speed of sound c is affected by temperature and airflow, the present embodiment also uses the ultrasonic sensor 21 immediately before and immediately after the ignition of the burner, as in the first embodiment. Since the ultrasonic sensor 21 is used during a period that is hardly affected by the ascending or rising air current, a large error does not occur.
[0028]
Here, in this embodiment, when any of the ultrasonic sensors 21 does not detect the cooking container 5 immediately before ignition, it is determined that the cooking container 5 is not placed on the virtues 6, and the fuel to the burner is determined. The burner is ignited by making the gas supply amount smaller than when the cooking container is detected. In this way, ignition is not performed with an extremely large heating power at the time of ignition. Further, when it is determined that the cooking container 5 is not placed on the virtues 6, control may be performed so that the burner is not ignited. Below, the case where the cooking container 5 is mounted in Gotoku 6 is demonstrated.
[0029]
For the sake of simplicity, the cooking container 5 has a circular flat bottom, the outer surface of the cooking container 5 is orthogonal to the bottom surface, and the distance from the center position of the burner to each ultrasonic sensor 21 is set respectively. It shall be equal. In this case, if the distances detected by the ultrasonic sensors 21 are substantially equal, it is considered that the center of the bottom surface of the cooking container 6 and the center of the burner substantially overlap as shown in FIG. At this time, the larger the distance detected by each ultrasonic sensor 21, the smaller the diameter of the cooking container 5. Therefore, similarly to the first embodiment, the opening amount of the temperature control valve 13 at the time of ignition and the upper limit of the heating power at the time of combustion are set according to the diameter of the cooking vessel 5.
[0030]
On the other hand, as shown in FIG. 8, when the center of the bottom surface of the cooking container 6 is displaced from the center of the burner, the distance detected by each ultrasonic sensor 21 varies. In such a case, it is considered that the cooking container 5 corresponding to the maximum distance among the distances detected by the ultrasonic sensors 21 is placed on the five virtues 6, and the opening amount of the temperature control valve 13 at the time of ignition and The upper limit of the thermal power at the time of combustion is set so as to correspond to this cooking container 5. That is, if the cooking container 6 is displaced with respect to the burner as shown in FIG. 8, the cooking container 5 hardly overlaps the burner on the left end side of the cooking container 5, so that if the heating power is large, the flame is cooked. It will overflow to the side of 5. Therefore, the temperature control valve at the time of ignition is adjusted so that the distance from the center of the burner is the smallest on the outer surface of the cooking vessel 5 so that the flame does not overflow from any part of the cooking vessel 5. The opening amount of 13 and the upper limit of the heating power at the time of combustion are set small.
[0031]
In the present embodiment, the ultrasonic sensor 21 is supported by the support column 22 and protrudes upward from the upper surface of the virtues 6. However, since the ultrasonic sensor 21 is located away from the virtues 6, the cooking container 5 is shaken during cooking. However, the ultrasonic sensor 21 can be arranged at a position where the cooking container 5 does not come into contact. In the above-described example, four ultrasonic sensors 21 are used, but three or more are sufficient. Other configurations and operations are the same as those of the first embodiment.
[0032]
In each of the above-described embodiments, the ultrasonic sensors 7 and 21 are used as the object sensor and the distance measuring sensor. However, an optical object sensor and a distance measuring sensor using light beam projection and reception can also be used. is there.
[0033]
【The invention's effect】
The invention according to claim 1 has a comparatively large diameter by detecting the presence or absence of a heating container that is disposed at a predetermined distance from the center of the burner and a heating power adjusting means that adjusts the heating power of the burner that burns fuel gas. Non-contact-type object sensor that detects large cooking containers but does not detect cooking containers with relatively small diameters, and adjusts the heating power so that the upper limit of the burner's heating power when detecting non-detection of cooking containers by the object sensor is smaller than the detection time A non-contact type object sensor located at a predetermined distance from the center of the burner and detecting the presence or absence of a cooking container immediately above the object sensor. If the cooking container has a larger radius than the distance from the center to the object sensor, the upper limit of the heating power is increased, and the radius is smaller than the distance from the center of the burner to the object sensor. If have cooking vessel by reducing the upper limit of the thermal power, it is possible to flame from the burner is prevented from overflowing to the outer surface of the cooking container. In addition, since the object sensor is a non-contact type, compared with a case where the cooking container is mechanically detected as in the conventional configuration, no frictional noise is generated and the failure rate is reduced. Furthermore, since the cooking container is detected in a non-contact manner, even if the cooking container is shaken during cooking, it can be arranged at a position where it does not come into contact with the object sensor, and there is no hindrance.
[0034]
According to a second aspect of the present invention, in the first aspect of the invention, when the cooking container is not detected by the object sensor immediately before the burner is ignited, the amount of fuel gas supplied to the burner is made smaller than when the cooking container is detected. Because the fuel gas supply amount is adjusted when the burner is ignited, it is not ignited with an extremely large thermal power at the time of ignition, and the danger caused by suddenly igniting with a large thermal power is prevented. be able to.
[0035]
According to a third aspect of the present invention, in the first or second aspect of the present invention, the time from when the object sensor intermittently transmits an ultrasonic wave until the reflected wave is received after the ultrasonic wave is transmitted. It is an ultrasonic sensor that determines that a cooking container is present when it is within the specified range, and since the ultrasonic sensor can be easily waterproofed as it is also used for sonar, etc. It can be used without being greatly affected even if it is applied.
[0036]
The invention according to claim 4 includes a thermal power adjusting means for adjusting the thermal power of the burner for burning the fuel gas, and three or more measuring devices for detecting the distance to the outer surface of the cooking container disposed at least at three locations around the burner. A position sensor for detecting the size of the cooking container and the displacement of the center of the cooking container relative to the center of the burner based on the relationship between the distance sensor and the distance to the cooking container detected by each distance measuring sensor; And a control means for instructing the heating power adjusting means to reduce the upper limit of the burner's heating power as the minimum distance to the outer surface of the cooking container is smaller. A non-contact type distance measuring sensor is provided around the burner. Since the distance to the outer surface of the cooking container is obtained by arranging more than one, not only the size of the cooking container but also the displacement of the central position of the cooking container from the center position of the burner can be obtained. That. Here, when the cooking container is small or when the cooking container is displaced with respect to the burner, it is possible to prevent the flame from the burner from overflowing to the outer surface of the cooking container by reducing the upper limit of the heating power. It becomes possible. In addition, since the distance measuring sensor is a non-contact type, compared with the case where the cooking container is mechanically detected as in the conventional configuration, the frictional sound is not generated and the failure rate is reduced. Furthermore, since the cooking container is detected in a non-contact manner, even if the cooking container is shaken during cooking, the cooking container can be arranged at a position where it does not come into contact with the distance measuring sensor, and there is no obstacle. In addition, since it is a distance measuring sensor, it can also detect the displacement of the cooking container relative to the burner, and when the cooking container is displaced, the upper limit of the heating power is made smaller than when it is not displaced, and this also causes the flame to cook. It is possible to prevent the outer surface of the container from overflowing. In addition, as compared with a configuration in which the position and size of the cooking container are detected by a temperature sensor and an oxygen concentration sensor, the number of sensors is reduced, and the cooking container can be detected even before the burner is ignited.
[0037]
According to a fifth aspect of the present invention, in the invention of the fourth aspect, when the cooking container is not detected by the distance measuring sensor immediately before the ignition of the burner, the amount of fuel gas supplied to the burner is made smaller than that at the detection of the cooking container. The burner is ignited and the amount of fuel gas supplied when the burner is ignited is adjusted so that it is not ignited with an extremely large thermal power at the time of ignition. can do.
[0038]
In the invention according to claim 6, in the invention of claim 4, when the cooking container is not detected by the distance measuring sensor immediately before the ignition of the burner, the burner is not ignited, and it is determined that the cooking container does not exist on the burner. When the burner is not ignited, the danger caused by igniting in the absence of the cooking container can be prevented.
[0039]
According to a seventh aspect of the present invention, in the invention of the fourth to sixth aspects, the time until the distance measuring sensor intermittently transmits an ultrasonic wave and receives the reflected wave from the transmission of the ultrasonic wave is determined. It is an ultrasonic sensor that calculates the distance to the cooking container by converting it into a distance, and since the ultrasonic sensor can be easily waterproofed as it is also used for sonar and so on, boiled spills are detected in the object sensor. Even if it is applied, it can be used without being greatly affected.
[Brief description of the drawings]
1A and 1B show a first embodiment of the present invention, in which FIG. 1A is a cross-sectional view of a main part showing when a large-diameter container is detected, and FIG.
FIG. 2 is a plan view of the above.
FIG. 3 is a front view showing a heating power adjusting operation unit used in the above.
FIG. 4 is a block diagram of the above.
FIG. 5 is an operation explanatory view of the above.
6A and 6B show a second embodiment of the present invention, in which FIG. 6A is a cross-sectional view of a main part showing when a large-diameter container is detected, and FIG.
FIG. 7 is a plan view of the same.
FIG. 8 is a plan view showing a state in which the cooking container is displaced with respect to the burner.
FIG. 9 is an operation explanatory diagram of the ultrasonic sensor used in the above.
[Explanation of symbols]
5 Cooking container 7 Ultrasonic sensor 10 Control circuit 13 Temperature control valve 21 Ultrasonic sensor

Claims (7)

A heating power adjusting means for adjusting the heating power of the burner for burning the fuel gas, and a cooking container having a relatively large diameter is detected by detecting the presence or absence of the cooking container located immediately above the center of the burner. A non-contact type object sensor that does not detect a relatively small cooking container, and a control means that instructs the heating power adjusting means to make the upper limit of the burning power of the burner when the cooking container is not detected by the object sensor smaller than the detection time. A gas stove combustion control device comprising: 2. The gas stove according to claim 1, wherein when the cooking container is not detected by the object sensor immediately before the ignition of the burner, the amount of fuel gas supplied to the burner is made smaller than when the cooking container is detected and the burner is ignited. Noro combustion control system. It is an ultrasonic sensor that judges that a cooking container exists when the time from when the object sensor intermittently transmits ultrasonic waves and when the reflected waves are received after the ultrasonic waves are transmitted is within a specified range. The gas stove combustion control apparatus according to claim 1 or 2, wherein Thermal power adjusting means for adjusting the thermal power of the burner for burning fuel gas, three or more distance sensors for detecting the distance to the outer surface of the cooking container disposed at least at three locations around the burner, and each distance sensor Position detection means for detecting the size of the cooking container and the displacement of the center of the cooking container relative to the center of the burner based on the relationship of the distance to the cooking container detected by A gas stove combustion control device comprising: control means for instructing the thermal power adjusting means to decrease the upper limit of the thermal power of the burner as the distance is smaller. 5. The gas according to claim 4, wherein when the cooking container is not detected by the distance measuring sensor immediately before the ignition of the burner, the amount of fuel gas supplied to the burner is made smaller than when the cooking container is detected to ignite the burner. Stove combustion control device. 5. The gas stove combustion control apparatus according to claim 4, wherein when the cooking container is not detected by the distance measuring sensor immediately before the ignition of the burner, the burner is not ignited. The distance measuring sensor is an ultrasonic sensor that intermittently transmits ultrasonic waves and calculates the distance to the cooking container by converting the time from transmission of ultrasonic waves to reception of reflected waves into distance. The gas stove combustion control device according to any one of claims 4 to 6.

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