JPH0113254Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a combustion control device that ignites and extinguishes a gas combustor in a short time.It can be ignited and extinguished with a single switch operation, and can be remotely operated. The aim is to simplify the circuit configuration and provide the product at low cost.

Conventionally, during ignition operation, the discharge current of the capacitor is passed through a solenoid for pressing the electromagnetic safety valve to push the electromagnetic safety valve open, and the discharge current of the capacitor is passed to the igniter to blow a spark and ignite in a short time. Individually, it is well known that a reverse voltage is applied to the electromagnetic coil of the safety valve so as to cancel out the thermoelectromotive voltage caused by the thermocouple, and the electromagnetic safety valve is forcibly closed to extinguish the fire in a short time. There have been proposals to incorporate combustion safety devices into gas combustors equipped with combustion safety devices consisting of electromagnetic safety valves, but all of them had the disadvantage of complex circuit configurations.

This invention is an attempt to solve the above-mentioned drawbacks, and its gist is to use the discharging current and charging current of the capacitor to cause the discharging current to flow through the igniter and the electromagnetic coil of the electromagnetic safety valve during ignition operation. The safety valve is opened in a short time, a charging current is passed through the electromagnetic coil when the fire is extinguished, the thermoelectromotive current of the thermocouple is canceled by the charging current, and the electromagnetic safety valve is closed, thereby igniting and extinguishing the fire in a short time. It is easy to do.

An embodiment of this invention will be described below based on the drawings.

In FIGS. 1 and 2, 1 is a thermocouple that generates a thermoelectromotive force when heated by a pilot burner flame;
Mg is the electromagnetic safety valve 4 that opens and closes the fuel supply passage 17
The electromagnetic coil constitutes the combustion safety circuit A with the thermocouple 1. S is a changeover switch that allows ignition and extinguishing operations to be performed remotely; 2 is an igniter that releases sparks during ignition operation; 3
5 is a solenoid that presses and opens the electromagnetic safety valve 4, and 5 is a water flow switch that is installed in connection with the pressure rod 26 operated by the water pressure response device 24, and is turned on when water is not flowing and OFF when water is flowing. Ignition circuit B with parallel connection of 2 and solenoid 3
, water flow switch 5 and combustion safety circuit A electromagnetic coil
Configure a capacitor discharge circuit by connecting Mg in series. At the time of ignition operation, a changeover switch S connects a capacitor C to the discharge circuit,
During fire extinguishing operation, the changeover switch S is used to connect the capacitor C to the charging circuit consisting of the electromagnetic coil Mg and the DC power supply E, and the polarity of the DC power supply E is set so that when the capacitor C is connected to the charging circuit, the capacitor C is connected to the electromagnetic coil Mg. The charging current flowing to thermocouple 1
The current is made to flow in a direction that cancels out the thermal electromotive current generated by the current. In addition, 6 in the figure is an indicator that displays the terminal voltage of the electromagnetic coil Mg and allows confirmation of ignition and extinguishment from a remote location.
It is also installed in the remote control box. FIG. 2 is a schematic explanatory diagram of a gas instantaneous water heater to which the circuit configuration of FIG. 1 is applied. In the figure, the same components as in FIG. , 8' is a plunger shaft connected to the plunger 8, and 9 is an electromagnetic safety valve 4.
An operating rod that opens the safety valve 12 by separating it from its valve seat 13 at the initial stage of ignition,
It is provided so that it can be pressed by the tip of the. 21
16 is a movable iron piece connected to the safety valve 12 via a shaft 14, and comes into contact with the electromagnet 7 when the safety valve 12 is opened. ing. 17 is a gas supply passage, and when the safety valve 12 from the gas supply passage 17 is opened, gas is supplied from the valve chamber 18 to the main burner 2 through the valve hole between the safety valve 12 and the valve seat 13.
7 and is supplied to a pilot burner 19 and an ignition burner 20. Reference numeral 11 denotes an ignition burner gas valve that controls the supply of gas to the ignition burner 20, and when the operating rod 9 is operated, a taper portion 10 provided at the front of the operating rod 9 allows gas to be supplied to the ignition burner 20 via the operating rod 11'. te spring 2
It is pushed up against the auxiliary forces of No. 3 and opened. A main burner valve 25 controls the supply of gas to the main burner 27, which moves up and down according to the pressure rod 26 operated by the hydraulic response device 24, closes when water is not flowing, and opens when water flows.

Next, the operation of the above configuration will be explained.

When the changeover switch S is switched to the capacitor discharge circuit side during ignition operation, the water flow switch 5 is closed when water is not flowing, and the capacitor C is discharged to the solenoid 3, igniter 2, and electromagnetic coil Mg of the electromagnetic safety valve 4 via the water flow switch 5. A current flows, energizing the electromagnet 7 around which the electromagnetic coil Mg is wound, and the solenoid 3 is also energized, attracting the plunger 8 of the solenoid 3, and the spring 21 is generated at the tip of the plunger shaft 8' connected to the plunger 8. The operating rod 9 of the safety valve 12 of the electromagnetic safety valve 4 is pressed against the urging force of the electromagnetic safety valve 4, and the taper portion 10 provided in front of the operating rod 9 presses and opens the ignition burner gas valve 11 via the operating rod 11'. and the electromagnetic safety valve 4 at the tip of the operating rod 9.
The safety valve 12 is opened away from the valve seat 13 against the biasing force of the spring 22 that presses against the valve seat 13, and the movable iron piece 16 connected to the safety valve 12 by the shaft 14 is pressed until it comes into contact with the electromagnet 7. The movable iron piece 16 is attracted to the electromagnet 7 which is moving and being excited. At this point, all gas main valves (not shown) are open, so gas enters the valve chamber 18 from the fuel supply passage 17, passes through the gap between the safety valve 12 and the valve seat 13, and is supplied to the pilot burner 19. At the same time, since the ignition burner gas valve 11 is also pushed open, gas is also supplied to the ignition burner 20. At the same time as the solenoid 3 is energized, the igniter 2 is also energized to blow a spark and ignite the ignition burner 20, and the pilot burner 19 is ignited. After a predetermined period of time, the igniter 2, solenoid 3 and electromagnetic coil are
The discharge current of capacitor C to Mg decreases, and eventually igniter 2 stops sparking, solenoid 3 is de-energized, and plunger 8 and operating rod 9
is returned to its pre-operation position by the spring 21, and at the same time, the ignition burner gas valve 11 is also returned to its pre-operation position by the spring 23, and the ignition burner 20 whose gas supply to the ignition burner 20 has been cut off is extinguished. After that, the electromagnetic safety valve 4 is released from the forced attraction (opening) due to the discharge current, but at that point, the thermocouple 1 has already generated enough thermoelectromotive force to attract and hold the movable iron piece 16 to the electromagnet 7, so the movable iron piece 16 is attracted and held by the electromagnet 7, so the safety valve 12 is kept open and the pilot burner 19 continues combustion. Then, when a hot water tap (not shown) is opened as necessary, the pressure rod 26 is operated by the hydraulic response device 24, and the in-burner valve 25 is pushed open, causing the main burner 2 to open.
Gas is supplied to 7 and ignited by the pilot burner flame, hot water is supplied, and the water flow switch 5 is opened to cut off the power to the ignition circuit B and the electromagnetic coil Mg.

Next, when extinguishing a fire, switch the changeover switch S to the capacitor charging circuit side (the state shown in Figure 1), and the capacitor C will be connected to the DC power supply E via the electromagnetic coil Mg, and will be charged by the DC power supply E. The charging current flowing through the electromagnetic coil Mg is the thermocouple 1.
The excitation force of the electromagnet 7 suddenly decreases, and the movable iron piece 16 and the safety valve 12 return to their pre-operation positions due to the drag force of the spring 22, and the electromagnetic safety valve 4 is closed by the pilot burner 19 and the main burner 27. The gas supply is cut off and the fire is extinguished. In addition, in the discharge circuit of the capacitor C, a water flow switch 5 is installed in series with the ignition circuit B consisting of the igniter 2 and the solenoid 3. The device 24 operates the pressure rod 26 to open the main burner valve 25, and gas is supplied to the main burner 27 at the same time as the ignition operation, so if the ignition is delayed, a larger amount of raw gas will be supplied to the main burner 27. There was a risk that an explosive ignition would occur after the water spouted out, but when the pressure rod 26 moved upward, the lower end of the pressure rod 26 would separate from the water flow switch 5 and turn off the water flow switch 5. Even if the ignition operation, that is, the changeover switch S is switched to the capacitor discharge circuit while water is flowing, the discharge current of the capacitor C will not flow to the ignition circuit B and no ignition will occur, so explosive ignition can be prevented.

In the embodiment described above, the solenoid 3 is connected to the ignition circuit B, and the plunger 8 of the solenoid 3 is connected to the ignition circuit B.
Although the case is shown in which the safety valve 12 of the electromagnetic safety valve 4 is pressed open, the solenoid 3 does not necessarily need to be installed, and in that case, it is necessary to manually press and open the safety valve 12 during the ignition operation.

As mentioned above, according to this invention, the discharging current and charging current of the capacitor are used to flow a charging current to the igniter, solenoid, and electromagnetic coil during ignition operation, and to flow charging current only to the electromagnetic coil during extinguishing operation. This makes it possible to save energy, and the circuit configuration is extremely simplified, allowing the product to be provided at low cost. In addition, by switching and connecting the capacitor to the capacitor discharging circuit during ignition operation and to the capacitor charging circuit during extinguishing operation, ignition and extinguishment can be achieved in a short time, and it can be done in one operation by operating one changeover switch. It is effective and can be easily controlled remotely, making it extremely convenient to use.

[Brief explanation of drawings]

Fig. 1 is a circuit diagram showing an embodiment of the combustion control device for a gas combustor according to this invention, and Fig. 2 is a schematic explanatory diagram of a water heater using the combustion control device for a gas combustor according to this invention. be. 1... thermocouple, 2... igniter, 4... electromagnetic safety valve, C... condenser, Mg... electromagnetic coil, E... DC power supply, A... combustion safety circuit.

Claims (1)

[Scope of utility model registration request] At the time of ignition operation, a capacitor C is connected by an ignition switch S to a capacitor discharge circuit in which the electromagnetic coil Mg of a combustion safety circuit A consisting of a thermocouple 1 and an electromagnetic coil Mg of an electromagnetic safety valve 4 is connected in series with an igniter 2 to extinguish the fire. During operation, the capacitor C
A combustion control device for a gas combustor, characterized in that it can be connected to a capacitor charging circuit in which an electromagnetic coil Mg and a DC power source E are connected in series by an ignition switch S.