JPS6014064Y2 - Gas pipe closure device with safety device - Google Patents

Description

[Detailed description of the invention] This invention is a gas pipe closing device with a safety device, more specifically, when a gas leak is detected by the gas pipe closing device and the gas main is closed, all the taps of the gas appliances are closed. This invention relates to a gas pipe closing device equipped with a safety device that makes it impossible to open the gas main pipe again unless the main gas pipe is opened again.

A gas pipe closing device for closing a gas main pipe based on a gas detection signal from a gas detector has already been devised and disclosed by the present applicant (Utility Application No. 169835/1983).

However, this gas pipe closing device only closes the gas main immediately when gas is detected, and the gas main can be unblocked without having to close all gas appliances once. .

As is clear, when the gas pipe closure device is activated, not only do you have to close the gas valve where the gas leak occurred, but you must also close all the gas valves in use, otherwise gas will leak again when the gas pipe is unblocked. wake up

In the winter, when various gas appliances are used in many rooms, the gas pipe closing device may be activated and the valves of all gas appliances may be closed even when it is necessary to close them once. .

At this time, the gas pipe closing device of the earlier application does not close the gas main pipe until a gas leak occurs and the gas leak is detected again by the gas detector.

Therefore, the object of the present invention is to provide a safety device including the device described later, so that after the gas pipe closing device is activated, unless the gas valve is closed, the closing device is manually opened due to the activation of the safety device. An object of the present invention is to provide a gas pipe closing device with a safety device that forces the closure of the gas valve by immediately returning it to the closed state even when the gas valve is closed.

Another object of the present invention is to provide a gas pipe closing device with a safety device that allows visually confirming whether or not the stopper of a gas appliance is closed.

Still another object of the present invention is to provide a gas pipe closure device with a safety device that can be manufactured at low cost, has a simple structure, and operates reliably.

The gas pipe closing device with a safety device according to the present invention has a gas pipe closing device that operates a slide valve based on a gas detection signal to close the gas pipe. It is equipped with a safety device that activates the gas pipe and closes the gas pipe.

When the gas pipe closing device is in the closed position, the safety device closes the gas circuit including an inlet passage communicating with the gas main pipe, an inlet passage communicating with the gas branch pipe leading to the gas appliance, and a pressure valve connecting these. and a limit switch activated by the pressure difference between the pressure valves, and the switch is turned on by the pressure of the gas main when the valve of the gas appliance is open even if the closing device is activated, but when the valve is closed. If so, it is equipped with a pressure compensating spring that prevents the switch from operating.

Further, the present gas pipe closing device with a safety device can be equipped with a gauge that allows checking whether all the taps of the gas appliance are closed without resetting the closing device.

Next, the present invention will be explained in more detail with reference to the drawings.

FIG. 1 is an explanatory plan view showing one embodiment of the present invention, and X is a plan view showing an embodiment of the present invention.
This figure shows a gas pipe closing device having substantially the same structure and function as the device disclosed in Japanese Patent No. 243.

The gas pipe closing device X operates a push-pull electromagnet 2 in response to a gas detection signal from a gas detector 1, moves a slide valve 4 of a valve device 3 connected to the gas main, and closes the gas main. It is something to do.

Note that 5 is a guide frame for operating the slide valve 4, 6 is an operating punch that moves within the electromagnet 2, and 7 is an arm of the operating punch 6.

When the gas detector 1 is activated, current flows through the conductor 8, the limit switch 9, the conductor 10, the electrical switch 11 and the conductor 12.

As a result, the electric switch 11 is activated, and current supplied from another power source is transferred to the conductor 13, the electric switch 11, the conductor 14,
Electromagnet 2, conductor 15, limit switch 16 and conductor 1
It flows through 7.

The electromagnet 2 is therefore energized and the actuating punch 6 moves in the direction of arrow A, whereby the guide frame 5 also moves in the direction A to close the gap between the inlet 18 and the outlet 19 of the gas main by means of the slide valve 4.

At this time, the limit switch 9. whose arm 7 keeps the conductors 8, 10 and 15, 17 connected, respectively.・Press 16 to cut off the current flowing between them.

Although FIG. 3 is a side view of only the gas pipe closing device X, the gas detector and the like are omitted.

Now, Y in FIG. 1 indicates a safety device according to the present invention, and the safety device Y is an inlet passage 21 communicating with the valve device 3 via a gauge 20.
and a pressure valve 24 having an inlet passage 23 communicating with the outlet 19 via a gauge 22, and a limit switch 25.

A piston 27 with an O-ring 26 and a spring 28 are arranged in the pressure valve 24, and an actuating punch 29 connected to the piston 27 actuates the limit switch 25.

FIG. 2 is a cross-sectional explanatory diagram showing the function of the safety device Y when the valve device 3 is activated. As mentioned above, when the gas pipe closing device
moves to the left end within the valve device 3.

Since the slide valve 4 has a pair of O-rings 30 and a central groove 31, gas from the inlet 18 does not flow to the outlet 19, but flows through the groove 31 to the inlet passage 21.

This gas pressure pushes the liquid in the gauge 20, which pushes the piston 27 in the pressure valve 24 and causes the operating punch 29 to turn on the limit switch 25.

This occurs when even one tap on a gas appliance is open.

That is, the pressure inside the introduction path 23 is reduced to the branch pipe 32 leading to the gas appliance.
If even one stopper of a gas appliance attached to the gas appliance is opened, the gas is released to the atmosphere through the stopper, and the pressure difference between the gas pressure inside the inlet passage 21 becomes very large, and the gas pressure is resisted against the force of the spring 28. This is because the piston 27 moves.

However, once all the taps of the gas appliance are closed, the action of the spring 28 causes the piston 27 to move outward and the limit switch 25 to be disconnected.

When the limit switch 25 is connected, that is, when even one gas valve is open, one conductor 33 of the limit switch 25 is connected to the conductor 13, and the other conductor 34 is connected to the limit switch 25.
is connected to the conductor 14 (see FIG. 1), so the current flows through the conductor 33, the limit switch 25, the conductor 34, the electromagnet 2, and the conductor 15.

However, since the gas pipe closing device X is operating and the limit switch 16 is turned off, no current flows to operate the electromagnet 2.

In this state, when the guide frame 5 is pulled by hand to open the gas pipe closing device It reaches 17.

As a result, the electromagnet 2 is activated again and the slide valve 4 of the gas pipe closing device X closes the gas main pipe.

If all the valves of the gas appliance are closed, the limit switch 25 will not turn on, so the gas pipe closing device can be opened manually.

Note that when the gas pipe closing device .

However, if the gas line closure device X does not close even one of the taps of the operating gas appliance, the pressure difference between the inlets 21 and 23 will appear on the gauge.

This allows the user to check whether all the taps have been closed.

Of course, either one of the gauges may be used, or it is not necessary to provide this gauge.

The gas pipe closing device and the conductive wire 13.

As a result, when the gas pipe closing device X is activated and the gas pipe is closed, the lamp will turn on.

According to the present invention, when the gas pipe closing device is activated, the gas pipe cannot be unblocked unless all gas appliances are closed, so it is very safe.

[Brief explanation of drawings]

Fig. 1 is an explanatory plan view showing one embodiment of the present invention, Fig. 2 is an explanatory cross-sectional view with a part of the device shown in Fig. 1 omitted, and Fig. 3 is a partially omitted side view of only the gas pipe closing device. It is. Description of main parts, X...Gas pipe closing device, Y...
...Safety equipment, 1...Gas detector, 2...
...Electromagnet, 3...Valve device, 4...
・Slide valve, 9, 16... Limit switch, 11... Electric switch, 20, 22...
・Gauge, 24...Pressure valve, 25...
Limit switch, 27...Piston, 28.
·····spring.

Claims (1)

[Claims for Utility Model Registration] 1. A gas pipe closing device It consists of a safety device that closes the slide valve again based on the difference between the gas pressure and the pressure of the gas branch pipe opened to the outside world, and the safety device communicates with the gas supply main pipe 21 and the gas leading to the gas appliance. A gas circuit including an introduction path 23 that communicates with the branch pipe 32 and a pressure valve 24 that connects these, a limit switch 25 that is activated by the pressure difference between the pressure valves 24, and an electromagnet of the gas pipe closing device X that operates the switch. 2 conductor 33.
34. A gas pipe closing device with a safety device. 2. The gas pipe closing device with a safety device according to claim 1, wherein the pressure valve 24 is provided with a gauge 20° 22 for pressure indication.