JPH022049B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a combustion safety device for a combustor.

In a combustor, the time from when the ignition push button is pressed until the burner ignites can take a considerable amount of time if air is present in the fuel passage.
In such a case, the capacitor is always charged, and at the same time as the ignition push button is pressed, the charge in the capacitor is discharged using a switch, and this discharge current excites the solenoid of the solenoid valve to forcefully open the safety valve. If the capacity of the capacitor is small, if the pressing operation of the manual operation member is stopped after the ignition burner is ignited and before the electromotive force is generated by the thermocouple facing the burner, the capacitor will Since the safety valve is discharged, the safety valve cannot be forcibly kept open and the burner cannot be kept ignited. In order to prevent this, for example, in the conventional technology seen in Utility Application No. 1135-1983, a capacitor with a relatively large capacity is used, and the electromagnetic safety valve is operated for a relatively long period of time, that is, when the ignition push button is pressed, the burner is The total time of the time until ignition and the time from ignition of the burner to the generation of electromotive force of the thermocouple facing the burner was forcibly held.

However, since the capacitor has a relatively large capacity, the amount of electricity charged in the capacitor and the amount of electricity leaked due to constant charging are large, and when the power source is a battery, its lifespan is short and the capacitor is expensive. .

The purpose of the present invention is to eliminate such inconveniences, and a valve is opened by pressing a manually operated member in a fuel passage connected to a burner, and the valve opening state is determined by the discharging current of a capacitor and a thermocouple facing the burner. In the type that intervenes in the electromagnetic safety valve held by the electromotive force of A capacitor is connected to a power supply circuit, and when the pressing operation of the manual operation member to the overpressure operation range is released, the capacitor is activated to switch and connect the capacitor from the power supply circuit to a discharge circuit in which the solenoid of the electromagnetic safety valve intervenes. It is characterized by the provision of a switch.

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a manual operation member, which is connected to a push button 3 installed opposite to the operation panel 2 on the front side of the combustor, and extends forward coaxially with the push button 3 into a fuel passage 5 connected to the burner 4. It is composed of an operating rod 6 that is inserted, and a lever 7 that is rotated by the operating rod 6. 8 is an electromagnetic safety valve 1 comprising a safety valve 9 facing the operating end of the lever 7 and a solenoid 11 holding the safety valve 9 in an open position against a spring 10;
Reference numeral 2 denotes a shutoff valve fixed to the operating rod 6, and when the push button 3 is pressed against the return spring 13 from the starting end position, the shutoff valve 12 is opened via the operating rod 6 at an intermediate position. Then, in the end position, the safety valve 9 is opened via the lever 7, and the operating rod 6 is forced to connect the ignition passage 14 to the fuel passage in the end position, as shown clearly in FIG. The ignition valve 15 is formed of a small diameter portion and operates to communicate with the safety valve 9 and the cutoff valve 12 and the ignition burner 16 via the ignition valve 15 by pressing the push button 3 to the terminal position. gas was supplied to the

In addition, the igniter 17 is closed at the end position of the push button 3.
An ignition switch 18 is provided to operate the ignition switch 18. The push button 3
When the pressure is released at the terminal position, the return operation is stopped at the intermediate position by the claw piece 20 that engages with the protrusion 19 formed thereon, and when the fire extinguishing button 21 provided separately is pressed, the claw piece 20 engages with the projection 19 formed thereon. It was made so that it can be restored by releasing the engagement at 20.

The above is not particularly different from what was proposed earlier, but
According to the present invention, the manual operating member 1 can be pressed to an overpressing operation range that is equal to or higher than the terminal position where the electromagnetic safety valve 8 opens.

To explain this configuration with respect to the one shown in the figure, a square-shaped leaf spring 22 is attached to the operating rod 6 side of the lever 7,
The spring force of the leaf spring 22 is made stronger than that of the spring 10, and the deflection of the leaf spring 22 causes the safety valve 9 to close.
After the valve is opened, the manual operation member 1 can be pressed up to an overpressure operation range beyond its terminal position.
In addition, a switch 23 having the configuration shown in FIG.
were arranged along the manual operation member 1. The switch 23 has a roller portion 26 whose actuator 24 rises from the base by the elastic force of a spring 25, and the elastic force of the spring 25 is set to be weaker than that of the spring 27.
Thus, when the manual operation member 1 is pressed from the right side of the figure, the roller part 26 is only tilted by the member 1 as shown by the broken line and does not operate, so that the movable contact contacts one of the fixed contacts. remains as it is,
When the pressing operation is released and the member 1 is moved in the direction of the arrow, the roller portion 26 is moved by the spring 27 by the member 1.
The movable contact is operated by moving upward in the figure against the force, and the movable contact is switched to the other fixed contact. The switch 23 has its movable contact 2 as shown in the fourth figure.
8 is connected to a capacitor 30 that supplies a discharge current to forcibly hold the safety valve 9 until the solenoid 11 of the electromagnetic safety valve 8 is energized by the electromotive force of the thermocouple 29 and the safety valve 9 is attracted to the open state. One of the fixed contacts is connected to the power supply circuit 31, and the other is connected to the solenoid 11 of the electromagnetic safety valve 8 and the thermocouple 29.
are connected to the intervening discharge circuit 32, and the capacitor 30 is normally connected to the power supply circuit 31, and when the manual operation member 1 that has been pressed to the over-pressing operation range is released, the capacitor 30 is activated and connected to the discharge circuit 32. I tried to connect.

In the figure, the igniter 17 is an ignition switch 18 that is closed in its terminal position in conjunction with the push button 3.
The ignition burner 16 is connected to the power source 33 via the ignition burner 16 to ignite the ignition burner 16 at the terminal position. To explain its operation, when the manual operation member 1 is pushed to the intermediate position, the cutoff valve 12 opens, and when it is pushed to the final position, the safety valve 9 is opened and the ignition switch 18 is closed to operate the igniter 17. ignition burner 1 via fuel passage 5 and ignition passage 14.
The fuel released from 6 ignites. Furthermore, when the manual operation member 1 is pressed to the overpressure operation range above the terminal position by bending the spring 22, and the pressing operation is released after the ignition burner 16 is ignited, the switch 23 is activated and the contact 28 is turned off to the power source. From the circuit 31 to the discharge circuit 32
Since the capacitor 30 is switched and connected, the charge in the capacitor 30 is discharged to the solenoid 11 of the electromagnetic safety valve 8,
This is energized to forcibly hold the safety valve 9. While this forced holding by the discharge current continues, the burner 4 is ignited by the ignition of the ignition burner 16, and an electromotive force is generated in the thermocouple 29, so the safety valve 9 is continuously held by the electromotive force.

In this way, according to the present invention, the manual operation member is configured to be able to be pressed to an overpressure operation range that is equal to or higher than the terminal position where the electromagnetic safety valve opens, and the capacitor is normally connected to the power supply circuit, and the A switch is provided which operates when the manual operating member 1 is released from the over-operation range to switch and connect the capacitor from the power supply circuit to a discharge circuit in which the solenoid of the electromagnetic safety valve intervenes, and the switch connects the capacitor from the power supply circuit to the discharge circuit in which the solenoid of the electromagnetic safety valve intervenes. Since the capacitor is discharged after the pressing operation of the operating member is released, the capacity of the capacitor is relatively small, and when the power source is a battery, its lifespan can be extended, and the capacitor is also inexpensive. .

[Brief explanation of drawings]

FIG. 1 is a cross-sectional side view of the essential parts of an embodiment of the present invention, FIG. 2 is a cross-sectional view of the ignition plug incorporated in the manual operating member in the open state, and FIG. 3 is a side view of the switch. FIG. 4 shows a circuit diagram. DESCRIPTION OF SYMBOLS 1... Manual operation member, 3... Push button, 4... Burner, 5... Fuel passage, 6... Operating rod, 8... Electromagnetic safety valve, 11... Solenoid, 16... Ignition burner, 17... Ignition Device, 18...Ignition switch, 2
2... Leaf spring, 23... Switch, 28... Movable contact, 29... Thermocouple, 30... Capacitor, 3
1...Power supply circuit, 32...Discharge circuit.

Claims (1)

[Claims] 1 A type of electromagnetic safety valve that intervenes in the fuel passage connected to the burner, which is opened by pressing a manual operation member and whose open state is maintained by the discharge current of a capacitor and the electromotive force of a thermocouple facing the burner. In the device, the manual operation member is configured to be able to be pressed to an overpressure operation range beyond the terminal position where the electromagnetic safety valve opens, and a capacitor is normally connected to a power supply circuit to prevent overpressure of the manual operation member. A combustion safety device characterized in that it is provided with a switch that operates when the pressing operation on the operating range is released to switch and connect the capacitor from the power supply circuit to the discharge circuit in which the solenoid of the electromagnetic safety valve intervenes.