JPH0933047A - Gas combustion device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a solenoid safety valve to be closed with a simple constitution in the case that a positive characteristic thermistor is short circuited in its trouble by a method wherein a bypass circuit for electrially energizing the positive characteristic thermistor and a current fuse while bypassing an exciting coil is provided with a switch which is turned on for a specified period of time when an ignition is carried out or when a flame extinguishing is performed. SOLUTION: An electrical energization control circuit section 30 has a bypass circuit B in which a switch 1 is connected between a point X and a point Y bypassing an exciting coil 4a and an auxiliary resistor 8 in addition to an exciting circuit A. Switches 1, 2 are turned on and off in cooperation with an operation at an ignition operating section. During igniting operation, there is provided a period in which the switches 1 and 2 are turned on concurrently. As the switch 1 in the bypass circuit B and time switch 2 in the exciting circuit A are turned on concurrently, a voltage of a cell 7 is applied directly to a positive characteristic thermistor 6 and a current fuse 5. In the case final the positive characteristic thermistor 6 is short circuited in its trouble, a large amount of current is flowed in time current fuse 5 to frue and cut the current fuse 5, resulting in that a solenoid safety valve 22 can not be held at its opened state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas combustor equipped with an electromagnetic safety valve that detects overheating by a positive temperature coefficient thermistor and shuts off gas supply.

[0002]

2. Description of the Related Art Conventionally, a gas table cooker provided with a safety device for preventing fire of tempura has been known.
For example, Japanese Patent Laid-Open No. 6-26653 discloses a gas control circuit of a gas stove in which a thermocouple, an exciting coil of an electromagnetic safety valve, and a positive temperature coefficient thermistor that abuts on the bottom of a pot and whose resistance increases with temperature increase are connected in series. Is disclosed. This is because the electromagnetic safety valve is normally opened and held by the thermoelectromotive force of the thermocouple, and when the pan bottom is overheated and reaches the set temperature of the positive temperature coefficient thermistor, the resistance value of the positive temperature coefficient thermistor sharply increases and the current flows. The quantity decreases and the electromagnetic safety valve is closed. Such a safety device naturally does not function properly when the PTC thermistor has a short circuit failure. In other words, even if the gas stove is overheated, the resistance value of the positive temperature coefficient thermistor remains unchanged at 0, so the electromagnetic safety valve will continue to burn without closing and the temperature of the pot bottom will rise and become dangerous. turn into. Therefore, in order to detect a short-circuit fault, a detection unit that monitors the voltage across the PTC thermistor is provided on the control board, or in order to close the electromagnetic safety valve at the time of a short-circuit fault, there is a series connection between the power supply and the PTC thermistor. It is necessary to provide a current fuse.
By providing such a detection unit, it is possible to inform the abnormality or close the electromagnetic safety valve to extinguish the fire when the PTC thermistor short-circuit failure occurs. If a current fuse is provided, the current fuse can be blown to prevent ignition when such a failure occurs.

[0003]

However, in the case where the control board is provided with the detection portion, a large number of parts are added, so that the manufacturing cost is high and the cost of the entire gas combustor is increased. Further, in the case where only the current fuse is provided, even if the positive temperature coefficient thermistor is short-circuited, the current fuse may not be blown if the battery is deteriorated. This is for the following reason. Even if the resistance of the positive temperature coefficient thermistor becomes 0 due to a short-circuit fault, the current flowing through the current fuse during energization increases only up to a predetermined current due to the internal resistance of the battery and the resistance of the exciting coil of the electromagnetic safety valve and the current fuse. . If the battery voltage is insufficient, this current increase is small, and if the current fuse has not reached the fusing current, the current fuse will not blow. Even if the specifications are such that sufficient fusing current can be secured while the battery is new, if the battery deteriorates and the battery voltage drops,
It is easy for this to happen. It is costly to increase the voltage by reliably increasing the number of batteries to blow the current fuse. Further, there is a limit to the reduction of the resistance of the exciting coil and the battery in order to increase the current flowing to the current fuse without increasing the voltage. Even if a current fuse that blows with a small current is used, there is a risk that the cost will increase and that the fuse will be erroneously blown even when there is a short circuit failure. An object of the present invention is to solve the above problems and to provide a gas combustor that secures safety by closing an electromagnetic safety valve with a simple configuration when a short circuit fault occurs in a positive temperature coefficient thermistor.

[0004]

A gas combustor according to claim 1 of the present invention which solves the above-mentioned problems includes an electromagnetic safety valve that maintains an open state when energized, and an exciting coil of the electromagnetic safety valve. In a gas combustor comprising a positive temperature coefficient thermistor and an energization control circuit in which an excitation power source is connected in series, the current control circuit connects the current fuse in series and bypasses the excitation coil to the positive temperature coefficient thermistor and A gist of the present invention is to include a bypass circuit for energizing a current fuse, and to provide a switch that is turned on only for a fixed time during an ignition operation or a fire extinguishing operation in the bypass circuit.

The gas combustor according to claim 1 of the present invention having the above-described structure is provided with a bypass circuit for bypassing the exciting coil of the electromagnetic safety valve in the energization control circuit and a switch for turning on the bypass circuit, and an ignition operation is performed. Or, in conjunction with the fire extinguishing operation, turn on the switch only for a certain time.
This energization control circuit is equipped with a positive temperature coefficient thermistor,
For example, when the temperature rises due to gas combustion, the electric resistance value is rapidly increased at the set temperature, the current to the exciting coil of the electromagnetic safety valve is decreased, and the electromagnetic safety valve is closed. Therefore, when this positive temperature coefficient thermistor is short-circuited, the electromagnetic safety valve cannot be closed even if it is overheated even though it can be ignited and the electromagnetic safety valve can be held open. Occurs. However, if the PTC thermistor is short-circuited when the switch is closed and the exciting coil is bypassed to supply electricity, the total combined resistance is reduced by the resistance in the exciting coil, and the current fuse is blown. When the current fuse is blown, the electromagnetic safety valve cannot hold the open state because the exciting current does not flow. In other words, it is safe because the PTC thermistor cannot continue to be used with a short circuit failure. In addition,
When the PTC thermistor is normal when the switch is closed and the exciting coil is bypassed to supply current, a current corresponding to the resistance value of the PTC thermistor flows through the current fuse and the current fuse does not melt. Therefore, normal use can be continued as it is. For example, when overheated, the resistance of the positive temperature coefficient thermistor sharply increases and the electromagnetic safety valve closes.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION In order to further clarify the structure and operation of the present invention described above, preferred embodiments of the gas combustor of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the gas table stove 15 is roughly classified into an ignition operation unit 10 for performing an ignition operation, a combustion unit 20 for burning a fuel gas, and an energization control for controlling ignition and combustion of these components. And a circuit section 30. As shown in FIG. 2, the ignition operation unit 10 is operated while being pushed and operated via the ignition knob 41, and the operation shaft 42 is inserted and the operation shaft 42 is pushed and guided only in the turning direction. A piezoelectric device 44 that generates a high voltage by operating the shaft 42, switches 1 and 2 provided on the left and right sides of the frame portion of the piezoelectric device 44, and a switch that is fixed to the operating shaft 42 and is pushed and rotated by the operating shaft 42. 1, a cam plate 43 for turning on and off 1, a lever 47 for penetrating the operation shaft 42 in the piezoelectric element 44, and restricting only the rotational direction, and turning on and off the switch 2 as the operation shaft 42 is pushed and turned, and a lever 47. The spring 46 that presses the piezoelectric element 44 against the piezoelectric element 44 and the pipe 1 that rotates with the rotation of the operation shaft 42
A closure 2 for opening and closing the flow path of the fuel gas supplied via 6
3, a pilot valve 24 for opening and closing the fuel gas flow path of the ignition pilot burner in the closure 23, and a pilot valve 24
Electromagnetic safety valve 2 of the energization control circuit part with the tip inserted through
And a spindle 18 that pushes 2 open. Combustion section 20
Is a main burner 29 that mixes fuel gas and primary air
And a burner head 27 that forms a flame port and burns the air-fuel mixture when placed on the main burner 29, and a main nozzle 21 that ejects fuel gas to the burner 29 before the burner 29.
And an electrode 26 that is discharged by being applied with a high voltage, and an electrode 26
The main burner 29 ignites the fuel gas for ignition by the discharge of
The pilot burner 32 for transferring the fire to the pilot burner 32, the pilot nozzle 31 for ejecting the fuel gas for ignition to the pilot burner 32, and the thermocouple 28 for generating thermoelectromotive force due to the flame of the main burner 29 are provided, and the burner head 27 has a central portion at the center. A temperature sensor 25 for accommodating the positive temperature coefficient thermistor 6 and contacting the bottom of the pan to detect the cooking temperature is provided.

As shown in FIG. 3, the energization control circuit unit 30 is provided with a battery 7 as a power source, and both ends (points X and Z) of the battery 7 are housed in temperature sensors 25 to control cooking temperature at the bottom of the pan. The positive temperature coefficient thermistor 6 to detect, the current fuse 5 that blows when a predetermined current is applied, and the ignition operation unit 10 described above.
Excitation coil 4 of electromagnetic safety valve 22 for opening and closing fuel gas of
An exciting circuit A is provided in which a, an auxiliary resistor 8 that determines the circuit current, and a switch 2 that interlocks with the operation to turn on the circuit while the device is in use are connected in series. In addition to the exciting circuit A, X which bypasses the exciting coil 4a and the auxiliary resistor 8
A bypass circuit B having a switch 1 connected between the point and the point Y is also provided. The switch 1 uses a normal micro switch in the combination of the push-and-turn type ignition operation unit 10 and the cam plate 43 as in this embodiment, but in the case of the push operation type, it is turned on only for a predetermined time. You can then use a timed switch that turns off automatically. The electromagnetic safety valve 22 is energized not only from the battery 7 to the exciting coil 4a, but also from the thermocouple 28 that generates thermoelectromotive force due to the flame of the main burner 29 in parallel with the exciting coil 4b. Exciting coils 4a and 4b from both simultaneously
The valve is held open only when a predetermined current is applied to the valve. Even if the power of either one of the exciting coils 4a and 4b is reduced, the valve is closed. When the switch 1 of the bypass circuit B and the switch 2 of the excitation circuit A are turned on at the same time, the voltage of the battery 7 directly changes to the positive temperature coefficient thermistor 6 and the current fuse 5 (point Y and Z).
Applied between points). At this time, if the positive temperature coefficient thermistor 6 has a short circuit failure, a large current flows through the current fuse 5 and the current fuse 5 is blown.

The fuel gas is guided to the main burner 29 via the ignition operation section 10 and ignited and burned as follows. Operation shaft 4 via ignition knob 41
When 2 is pushed, as shown in FIG. 1, the spindle 18 at the rear is slid to the rear of the instrument, the electromagnetic safety valve 22 in the fuel gas passage is pushed open, and the pilot valve 24 is also opened. Then, when it is pressed and rotated to the left to rotate to the ignition position, the operating shaft 42 rotates the closing member 23, and the gas passage of the closing member 23 is opened. Then, the fuel gas is supplied from the pipe 16 to the pilot nozzle 31 and the main nozzle 21 via the closure 23. At the same time, in conjunction with such movement of the operating shaft 42, the piezoelectric device 44 is actuated and the electrode 26 is discharged. Fuel gas is ejected from the pilot nozzle 31 to the pilot burner 32 and from the main nozzle 21 to the main burner 29. The discharge ignites the pilot burner 32 and transfers it to the main burner 29. When the ignition knob 41 is released, the spindle 18 returns to the front of the device and the pilot valve 24 closes, but the electromagnetic safety valve 22 simultaneously supplies the thermoelectromotive force generated by the combustion heat of the thermocouple 28 and the electric power from the battery 7. Then, since the valve is held open, the fuel gas is continuously supplied and the combustion continues. When the operating shaft 42 is rotated to the right via the ignition knob 41, the gas passage of the closure 23 is closed and the gas supply to the main burner 29 is stopped to extinguish the fire. At the same time, the thermoelectromotive force of the thermocouple 28 is reduced and the energization from the battery 7 is stopped, so that the electromagnetic safety valve 22 is also closed.

The switches 1 and 2 are turned on and off in conjunction with the operation of the operation shaft 42 of the ignition operation section 10. The operation shaft 42 is provided with a cam plate 43 and a lever 47.
When is rotated, it is rotated as a unit and the switches 1 and 2 are turned on and off. As described above, the ignition operation is started from the extinguished state, and the operation shaft 42 is operated via the knob 41.
When is rotated to the left while pushing in the axial direction, it rotates to the ignition position and locks further rotation.
When the main burner 29 is ignited and kept in that state for a while and the electromagnetic safety valve 22 is kept open, the operating knob 4
Even if 1 is released, combustion is continued with the operating shaft 42 returning to the front of the device. From this state, if you rotate it to the right as it is, it will return to its original state and extinguish the fire. When such an operation is performed, the switches 1 and 2 are turned on and off one after another as shown in FIG. 4, and the respective parts are energized accordingly. First, the switches 1 and 2 are turned on immediately after rotating the operating shaft 42 to the left while pushing it. During this time, the positive temperature coefficient thermistor 6 is checked for a short circuit failure. Then, when the operation shaft 42 is pushed and rotated, the switch 1 is disengaged and turned off at the step portion 43 a of the cam plate 43. Even if the electromagnetic safety valve 22 enters the open valve holding state and the ignition is completed and the operating shaft 42 returns to the front of the instrument, the switch 2 is kept in the ON state for the whole period, and the state at the time of combustion is continued. The switch 2 is turned off for the first time when the operation shaft 42 is rotated to the right and put into a fire extinguishing state.
During ignition operation, there is a period in which the switches 1 and 2 are simultaneously turned on. At this time, if the positive temperature coefficient thermistor 6 has a short circuit failure, the current fuse 5 is blown as described above.

In the gas table cooker 15, if the positive temperature coefficient thermistor 6 is short-circuited and the current fuse 5 is blown, the electromagnetic safety valve 22 will not operate even if the switch 2 is turned on.
Since no current flows from the battery 7, the electromagnetic safety valve 22 cannot be held open even if the ignition operation is performed. That is, the main burner 29 cannot be ignited to continue combustion. Therefore, it is safe because the PTC thermistor 6 cannot continue to be used with a short circuit failure. Moreover, since this switch 1 is interlocked with the operation shaft 42, it does not require a special operation for turning on the bypass circuit B, and can be operated together when the operation shaft 42 is operated. It is convenient. Further, when the burner is ignited, the piezoelectric device 44 is used and the operating force of the operating shaft 42 is utilized, so that electric power for generating sparks for ignition is not required. Therefore, when the bypass circuit B is closed, the influence on the excitation circuit A is small. In other words, since the ignition igniter circuit is not provided, it is not necessary to simultaneously supply the electric power for the excitation circuit A and the bypass circuit B as well as the ignition igniter circuit with one battery, so that the current is temporarily insufficient. Therefore, there is no inconvenience that the operation is delayed (the time until the electromagnetic coil 4a is excited and the electromagnetic safety valve 22 is held open).

Next, a second embodiment will be described. As shown in FIG. 5, the gas table stove 50 of the second embodiment.
Is different from the gas table stove 15 of the first embodiment mainly in the configuration of the ignition operation unit and the energization control circuit unit, and the other configurations are the same. Therefore, in order to avoid duplication, the same configuration is used for the same configuration. The detailed description is omitted. The ignition operation unit 40 is pushed by transmitting the operation to the operation panel 17 on the front surface, the push-type operation button 11, the ignition lever 12 that receives the movement of the operation button 11 and converts the movement to the front-back movement, and the spindle 18. When the button shaft 13 is moved forward to be engaged and held, and pushed again, the engaging and holding is released and retracted to return to the original position, the button guide 14 for accommodating the button shaft 13 and guiding the movement thereof, and the pipe 16. A main valve 23 that opens and closes the flow path of the fuel gas supplied via the main valve 23, a spindle 18 that opens the electromagnetic safety valve 22 of the energization control circuit section at the tip by inserting the main valve 23 in the middle, and a combustion section further downstream thereof. Needle valve 1 for adjusting the fuel gas flow rate to 20
9 is provided. As shown in FIG. 6, the energization control circuit unit 45 includes two batteries 7a and 7b as power sources, and the temperature sensor 25 is provided at both ends (points S and T) of the batteries 7a and 7b.
A positive temperature coefficient thermistor 6 that is housed inside and that detects the cooking temperature at the bottom of the pan, and a current fuse 5 that melts when a predetermined current is applied
An exciting circuit C in which the exciting coil 4a of the electromagnetic safety valve 22 that opens and closes the fuel gas of the ignition operation unit 10 and the switch 2 that turns on the circuit in conjunction with the operation are connected in series. In addition to the exciting circuit C, the exciting coil 4a
Also provided is a bypass circuit D in which the switch 1 is connected between points P and R, which bypass the battery 7b. In addition to the circuits C and D, both ends of the battery 7b and the switch 2 (points P and Q) are energized from the battery 7b and the electrodes 2
An igniter 9 for supplying a high voltage to 6 and a switch 3 for opening and closing the igniter 9 are provided in series. The electromagnetic safety valve 22
Not only the exciting coil 4a is energized from the batteries 7a and 7b, but also the thermocouple 28 which generates thermoelectromotive force due to the flame of the burner body 29 is energized in parallel to the exciting coil 4b in parallel to the exciting coil 4a. The valve is kept open only after a predetermined current is applied to the coils 4a and 4b. Excitation coil 4
Even if the electric power of either a or 4b is reduced, the valve is closed. When the switch 1 of the bypass circuit D is turned on, the voltage of the battery 7a is directly applied to the positive temperature coefficient thermistor 6 and the current fuse 5 (between the points S and R). At this time, if the positive temperature coefficient thermistor 6 has a short circuit failure, a large current flows through the current fuse 5 and the current fuse 5 is blown.

The switches 1, 2 and 3 are provided at the lower part of the button shaft 13 so as to operate in accordance with the forward and backward movement of the button shaft 13, and are turned on in conjunction with the operation of the operation button 11 which moves the button shaft 13 back and forth. ， Turn off. When the operation button 11 is pushed from the fire extinguishing state, the ignition operation is started, and even if the operation button 11 is released when ignited, the operation button 11 is engaged and held in a slightly returned state from the pushed state, and when the combustion is performed. Keep the state. When pushed again from this state, the engagement hold is released, the original state is restored, and the fire is extinguished.
When such an operation is performed, the switches 1, 2, and 3 are
As shown in FIG. 7, these sequences are turned on one after another,
It is turned off, and each part is energized accordingly. First, immediately after pushing the operation button 11, the switches 1, 2 and 3 are turned on, and the switches 1 and 3 are turned on only in the initial stage of the ignition operation,
When it ignites, it releases and turns off. In the state of combustion, both the switches 1 and 3 are off, but the switch 2 is on all the time. When it is pushed again and the fire extinguishing operation is started, the switch 3 is turned off for the first time.

Immediately after starting the ignition operation, there is a period in which the switch 1 is turned on. At this time, as already described with reference to FIG. 6, when the positive temperature coefficient thermistor 6 has a short circuit failure, an excessive current flows through the current fuse 5 regardless of the resistance value of the exciting coil 4a, and the current fuse 5 Will melt down. If the current fuse 5 is blown, even if the switch 2 is turned on,
Since the current from the batteries 7a and 7b does not flow through the exciting coil 4a, the electromagnetic safety valve 22 cannot be held open even if the ignition operation is performed. Even in such a state, the exciting coil 4a has a period in which only the current of the battery 7b temporarily flows when the switches 1 and 2 are turned on at the same time, but the switch 1 is turned on in the initial stage of the ignition operation. Since it is turned off during combustion, the electromagnetic safety valve 22 cannot be held open. In addition,
When the switch 1 closes the bypass circuit D and when the PTC thermistor 6 is normal, a current corresponding to the resistance value of both flows in the PTC thermistor 6 and the current fuse 5, and the current fuse 5 is not blown.

According to this gas table cooker 50, since the energization control circuit 45 is provided with the bypass circuit D, regardless of the resistance value of the exciting coil 4a, only the internal resistance of the battery 7a and the current fuse 5 causes the fusing current to flow. Is determined, the specifications of the exciting circuit C are prioritized and arbitrarily determined (for example, the batteries 7a and 7b, the exciting coil 4a, the positive temperature coefficient thermistor 6, and finally the specifications of the current fuse 5 are determined).
However, the current fuse 5 can be easily selected. That is, it suffices to select the current fuse 5 in which the value (current) obtained by dividing the voltage of the battery 7a by the combined resistance value of the battery 7a and the current fuse 5 reaches the predetermined fusing current. Moreover, since the current flowing through the bypass circuit D is supplied only from the battery 7a (that is, the battery 7b is not used), power consumption can be saved. Of course, even with such specifications, the current necessary for melting the current fuse 5 is sufficiently secured, and since both the batteries 7a and 7b are used in the exciting circuit C, the exciting coil 4a can be excited quickly. further,
Since this switch 1 is interlocked with the operation button 11, it does not require a special operation for turning on the bypass circuit D and can be operated together when operating the operation button 11, which is very convenient. is there. In addition, since the positive temperature coefficient thermistor 6 cannot continue to be used while having a short circuit failure, not only the failure can be immediately recognized but it is safe.

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 spirit of the present invention. It is. For example, the ignition operation unit 10 of the first embodiment has been described as a type that performs a rotation operation, but it may be a type that performs a push operation like the ignition operation unit 40 of the second embodiment. In that case,
A method of generating sparks for ignition may use an igniter or a piezoelectric device. That is, the ignition operation unit 40 does not include a piezoelectric device, and the igniter 9 is used instead of the piezoelectric device or the piezoelectric device is added. On the contrary, the ignition operating portion 40 of the second embodiment may be replaced with the ignition operating portion 10 of the first embodiment. Further, the piezoelectric device of the first embodiment can be changed to an igniter, and in this case, as shown in FIG. 3, the energization control circuit 30
An igniter circuit equipped with a switch 3 is added to the X point and the Y point. In addition, in the energization control circuit unit 30 of the first embodiment, the auxiliary resistor 8 is often unnecessary when the electrical resistances of the positive temperature coefficient thermistor 6 and the current fuse 5 are properly adjusted and selected. In addition, the bypass circuits B and D
The switch 1 for turning on may be turned on not only during the ignition operation but also during the fire extinguishing operation. Also, this switch 1
Instead of a normal micro switch, it is possible to use a time-delay switch that turns on for a predetermined time and then automatically turns off.

[0016]

As described in detail above, claim 1 of the present invention
The gas combustor described has a bypass circuit that bypasses the exciting coil in the energization control circuit, and when the switch of the bypass circuit is turned on, if the positive temperature coefficient thermistor has a short-circuit fault, the current fuse will melt and cannot be used. So it's safe. Moreover, when the ignition operation or the fire extinguishing operation is performed, the electric power is bypassed together to energize, so that the configuration is simple, the cost is low, and the operation is simple and very convenient.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a gas combustor as a first embodiment.

FIG. 2 is a schematic configuration diagram of an ignition operation unit of a gas combustor as a first embodiment.

FIG. 3 is a power supply control circuit diagram of a gas combustor as a first embodiment.

FIG. 4 is a diagram for explaining opening / closing of a switch in an ignition operation unit of a gas combustor as a first embodiment.

FIG. 5 is a schematic configuration diagram of a gas combustor as a second embodiment.

FIG. 6 is a power distribution control circuit diagram of a gas combustor as a second embodiment.

FIG. 7 is a diagram for explaining opening and closing of a switch in an ignition operating portion of a gas combustor as a second embodiment.

[Explanation of symbols] 1,2,3 switches 4a, 4b Excitation coil 5 Current fuse 6 Positive characteristic thermistor 7, 7a, 7b Battery 8 Auxiliary resistor 9 Igniter 10, 40 Ignition operation part 11 Operation button 15,50 Table stove 18 Spindle 20 Combustion part 22 Electromagnetic safety valve 23 Closure 25 Temperature sensor 30, 45 Energization control circuit part 42 Operation shaft 43 Cam plate 44 Piezoelectric device 46 Spring 47 Lever

Claims (1)

[Claims] 1. A gas combustor comprising an electromagnetic safety valve that maintains an open state when energized, and an energization control circuit in which an exciting coil of the electromagnetic safety valve, a positive temperature coefficient thermistor, and an exciting power source are connected in series. In the above, the energization control circuit includes a bypass circuit that connects the current fuses in series and bypasses the exciting coil to energize the positive temperature coefficient thermistor and the current fuses.
A gas combustor, characterized in that the bypass circuit is provided with a switch that is turned on only for a certain period of time during an ignition operation or a fire extinguishing operation.