JP3724655B2 - Table stove safety device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a safety device for a table stove using a positive temperature sensitive element whose electric resistance value rapidly increases at a set temperature for detecting the temperature at the bottom of the stove.
[0002]
[Prior art]
FIG. 3 is a schematic explanatory view of a conventional table stove 20, wherein 21 is a grill, 22 and 23 are stoves, and the gas supply pipe 20a to the grill 21 and stoves 22 and 23 are blinkers 21a, 22a and 23a. And gas burners 21b, 22b, and 23b are provided, and each of the flashers 21a to 23a is provided with magnet electromagnetic valves 24, 25, and 26 that can open and close the respective gas supply paths. Thermocouples 27, 28, and 29 are provided in the vicinity of the gas burners 21b to 23b, and NTC thermistors 30 and 31 for detecting the pan bottom temperature are provided in the stoves 22 and 23, respectively. Except for the pair 27 and the magnet solenoid valve 24, the control board 32 having a dry battery 32a is connected. Therefore, when the stoves 22 and 23 are ignited, the magnet electromagnetic valves 25 and 26 that are forcibly opened by the ignition operation are held by adsorption from the control board 32 and the gas supply is continued. Become. When the gas burners 22b and 23b are extinguished, the control board 32 that monitors the value of the thermoelectromotive force from the thermocouples 28 and 29 stops energization of the magnet solenoid valves 25 and 26. The control board 32 that monitors the electrical resistance values 30 and 31 is configured to stop energization of the magnet solenoid valves 25 and 26 and close the valves.
[0003]
[Problems to be solved by the invention]
In the above safety device, the thermoelectromotive force values of the thermocouples 28 and 29 and the electric resistance values of the NTC thermistors 30 and 31 are monitored by the control board 32 to control the energization of the magnet solenoid valves 25 and 26. Becomes complicated. Specifically, as shown in FIG. 4, on the control board 32, the thermocouple 28 is a safety circuit 35 that is composed of a comparator 33, a variable resistor 34, and the like, and the NTC thermistor 30 is a temperature control circuit 37 that is composed of a comparator 36 and the like. In this configuration, an adsorption holding current is supplied to the magnet electromagnetic valve 25 via the transistors 38 and 39 while a predetermined input voltage is input to the comparators 33 and 36, respectively. In particular, when there are a plurality of cookers as described above, the thermocouple 29 and the NTC thermistor 31 are similarly turned off, and the safety circuit 40 and the temperature control circuit 41 are required. In this case, the power supply is used to guarantee the operation of the comparator. The voltage monitoring circuit 42 is also required, and such a circuit configuration causes a cost increase.
Further, the above configuration requires a large amount of current consumption for the control board 32 and the energization current for holding the magnet solenoid valves 25 and 26 open, resulting in a short battery life.
[0004]
[Means for Solving the Problems]
Accordingly, the present invention provides a table stove safety device that can further reduce the cost by simplifying the configuration, and the configuration is self-opening the gas supply pipe inlet of the table stove by energization. An original solenoid valve comprising two windings, an adsorption winding and a holding winding that maintains a valve-open state when energized , is provided, and the original solenoid valve is connected in series with the temperature sensing element, A gas control circuit is configured with a power supply, and the gas control circuit is provided with energization control means for controlling energization to the gas control circuit in conjunction with the ignition operation of the stove. During ignition, at least the self-adsorption winding is energized, and thereafter, only the holding winding is energized .
Also, if there are multiple table stoves that use temperature sensitive elements, connect the temperature sensitive elements in all the table stoves in series, and connect the temperature sensitive elements and the original solenoid valve in series to establish a gas control circuit. Can be formed.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a schematic explanatory diagram of a table stove. The table stove 1 here is provided with a grill 2, a strong heating power stove 3, and a standard heating power stove 4. An original electromagnetic valve 6 having two windings, a holding winding 6a and a self-adsorption winding 6b, is provided at the inlet of the gas supply pipe 5 so that the gas supply pipe 5 can be opened and closed. Flickers 2a, 3a, 4a and gas burners 2b, 3b, 4b are provided from the tube 5 to the grill 2 and the stoves 3, 4, respectively, and the magnet solenoid valves 7, 8, 9 are respectively provided in the blinkers 2a-4a. Is provided. Further, a thermocouple 10 is provided in the vicinity of the gas burner 2b of the grill 2 and is connected to the magnet electromagnetic valve 7, and adsorbs the magnet electromagnetic valve 7 forcibly opened at the time of ignition by the thermoelectromotive force generated by heating the gas burner 2b. When the flame is extinguished, the magnet electromagnetic valve 7 is closed due to a decrease in the thermoelectromotive force.
In the stoves 3 and 4, the thermocouples 11 and 12 near the gas burners 3b and 4b, and the temperature at the set bottom temperature are detected by contacting the center of the pot bottom, and the electric resistance value is rapidly increased at the set temperature. PTC thermistors 13 and 14 are respectively arranged. As shown in the circuit diagram of FIG. 2, the thermocouples 11 and 12 are connected to the magnet solenoid valves 8 and 9, respectively, and like the grill 2, they are thermoelectromotive forces generated by heating the gas burners 3 b and 4 b, and are forced during ignition. On the other hand, the PTC thermistors 13 and 14 are connected to the original solenoid valve 6 and the energization control means 16 interlocked with the push operation of the ignition button. A gas control circuit 15 serving as a power source is configured. Specifically, as shown in FIG. 2, the PTC thermistors 13 and 14 are connected in series with the switch 16a of the energization control means 16 and the holding winding 6a of the original solenoid valve 6, and the self-adsorption winding 6b is It is connected to the dry cell 17 in parallel with the PTC thermistors 13, 14 and the like together with the switch 16b of the energization control means 16, and the two switches of the energization control means 16 are connected to the two windings at the time of ignition and when combustion continues, respectively. Energization control is performed. Incidentally, 18 is a resistor, and 19 is an igniter. Here, the set temperature of the PTC thermistor 13 on the side of the stove 3 is higher due to the difference in the heating power of the stove.
[0006]
The table stove 1 configured as described above will be described on the stove 3 side. When an ignition button (not shown) is pushed, the switches 16a and 16b of the energization control means 16 are closed, and the self-adsorption winding 6b. The original solenoid valve 6 is opened by energization of the gas to supply gas to the gas supply pipe 5. Since the magnet electromagnetic valve 8 of the flasher 3a is forcibly opened by this ignition operation, gas is supplied to the gas burner 3b, and at the same time, the igniter 19 is also operated and ignited. Thereafter, the magnet electromagnetic valve 8 is held open by the thermoelectromotive force of the thermocouple 11 that has detected the flame, and combustion continues. Thereafter, when the ignition button is released, the switch 16b is opened. However, since the holding coil 6a is energized by the switch 16a that is closed simultaneously with the ignition operation, the original electromagnetic valve 6 is held open as it is.
Here, when the flame disappears in the gas burner 3b, the magnet electromagnetic valve 8 is closed and the gas burner 3b is extinguished due to a decrease in the thermoelectromotive force from the thermocouple 11. On the other hand, when the pan bottom is overheated and reaches the set temperature of the PTC thermistor 13, the electrical resistance value increases rapidly and the energization amount to the holding winding 6 a decreases. Supply will be stopped. This is the same when the stove 4 is used. When the stoves 3 and 4 are used at the same time, the thermocouples 11 and 12 and the magnet solenoid valves 8 and 9 are associated with each other when they are turned off. When the pan bottom is overheated, both fires are extinguished by closing the original solenoid valve 6 even if it occurs in one of the stoves.
As described above, the table stove 1 is configured with a safety device that functions both in the case where it goes off and overheats the bottom of the pan. In particular, the PTC thermistors 13 and 14 that detect the pan bottom temperature are provided with the windings for holding the original solenoid valve 6. 6a, and the original electromagnetic valve 6 is directly opened and closed by changing the electric resistance values of the PTC thermistors 13 and 14, so that a complicated control board for monitoring the electric resistance values of the PTC thermistors 13 and 14 is provided. There is no need. Therefore, even if there are a plurality of stoves, a simple and low-cost gas control circuit 15 is sufficient, and current consumption is reduced. Further, here, the thermocouples 11 and 12 for detecting the disappearance are also directly connected to the magnet electromagnetic valves 8 and 9 of the stoves 3 and 4 and are held open by the thermoelectromotive force value. An inexpensive type can be used, and the overall configuration is further simplified, leading to further cost reduction. Further, the original electromagnetic valve 6 is provided with two windings, a holding winding 6a and a self-adsorption winding 6b. The initial electromagnetic valve 6 is opened by the self-adsorption winding 6b in the initial stage of ignition, and thereafter the low Since the valve is held open by the current holding coil 6a, the push-off operation of the valve body is not required at the time of ignition, and the operability is improved. The life of the dry battery 17 can be kept longer.
[0007]
In the present invention, the gas control circuit is constituted by the temperature sensing element for detecting the temperature at the bottom of the pan and the original solenoid valve provided at the gas supply pipe inlet, and is intended to be simplified. Therefore, various modifications can be made without departing from the scope of the present invention. The design can be changed, and the circuit board can be omitted depending on the specifications of the original solenoid valve. For example, if the original solenoid valve is of a single holding winding type, a push-off operation at the time of ignition is required, but only one switch is sufficient as the energization control means. Further, even if the extinguishing safety function on the thermocouple side is processed by the control board except for the gas control circuit, the cost reduction from the conventional configuration can be achieved.
[0008]
【The invention's effect】
As described above, according to the present invention, a simple gas control circuit is configured by associating the temperature sensing element for detecting the pan bottom temperature with the original solenoid valve provided at the gas supply pipe inlet, thereby eliminating the need for a complicated control board. The configuration of the table stove can be simplified, leading to cost reduction.
Also, the original solenoid valve is equipped with two windings, a self-adsorption winding and a holding winding, and is held by the energization control means at least in the self-adsorption winding when the stove is ignited, and thereafter for energizing only use windings on never full press operation or the like extra effort during ignition based on the electromagnetic valve is increased, the current consumption can be suppressed.
Furthermore, when there are a plurality of table stoves using temperature sensitive elements, the temperature control elements in all the table stoves are connected in series, and the temperature sensitive elements and the original solenoid valve are connected in series to provide a gas control circuit. If it forms, even if the pan bottom overheat occurs in one stove, all the stoves can be extinguished by closing the original solenoid valve. In addition, even if there are a plurality of stoves, a simple and low-cost gas control circuit is sufficient, and current consumption is reduced.
[Brief description of the drawings]
FIG. 1 is an explanatory view showing a safety device for a table stove.
FIG. 2 is an explanatory diagram of a gas control circuit.
FIG. 3 is an explanatory diagram showing a conventional tabletop safety device.
4 is a circuit explanatory diagram of the control board of FIG. 3;
[Explanation of symbols]
1 ・ ・ Table cooker 2 ・ ・ Grill, 3 ・ 4 ・ Steel 5 ・ ・ Gas supply pipe 6 ・ ・ Original solenoid valve 6a ・ ・ Retention coil 6b ・ Self-adsorption coil , 7, 8, 9 .. Magnet solenoid valve 10, 11, 12 .. Thermocouple, 13, 14 .. PTC thermistor, 15 .. Gas control circuit, 16 .. Energization control means, 17.

Claims (2)

It is a safety device for table stoves using a positive temperature sensing element whose electrical resistance value increases rapidly at the set temperature for detecting the bottom temperature of the stove.
An original solenoid valve comprising two windings, a self-adsorption winding that opens when energized and a holding winding that maintains the open state when energized, is provided at the gas supply pipe inlet of the table stove The original solenoid valve is connected in series with the temperature sensing element, and a gas control circuit is configured by providing a power source. The gas control circuit is energized to the gas control circuit in conjunction with the stove ignition operation. A safety device for a table stove, characterized in that an energization control means for controlling the power supply is provided , and the energization control means energizes at least the self-adsorption winding when the stove is ignited and only the holding winding thereafter. . When there are a plurality of table stoves using temperature sensitive elements, the temperature sensitive elements in all the table stoves are connected in series, and the temperature sensitive elements and the original solenoid valve are connected in series to form a gas control circuit. The safety device of the table stove according to claim 1 characterized by things.

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