JPS63259281A - Emergency cut-off device for gas - Google Patents

Abstract

PURPOSE:To make it impossible that gas cut-off action is performed in the normal condition, by forming a cut-off valve with a locking means adapted to lock an auxiliary cut-off valve when the cut-off valve is opened, and a release member adapted to release the locking means when the cut-off valve is closed. CONSTITUTION:A slant piece 20 as a release means is projectingly set on the outer circumferential rim of a cut-off valve 2, and a lock spring 21 which functions as a locking means adapted to stop the action of a cylindrical body 60 as an auxiliary cut-off valve, is set on the rim of an opening 5, which confronts the cut-off valve 2. In this way, as the top end of the cylindrical body 60 is locked by the lock spring 21, if a return shaft 6 is pushed in when the cut-off valve is not closed in the normal condition, it can be prevented the gas is stopped by the cylindrical body 60 as an auxiliary cut-off valve, in the normal condition.

Description

[Detailed Description of the Invention] [Object of the Invention] <Industrial Application Field> The present invention provides a method for operating a shutoff valve based on an output from a detection device that detects an abnormal condition related to the use of a motor. or 1l
-Ah Irya-do Ryo-dan-shu Sake; Maro 1 The operation is performed by a release type electromagnet, but it is related to the emergency cut-off VC setting.

<Prior Art> As the above-mentioned detection device, one has been provided in recent years that includes a gas flow rate detection device and a monitoring device constituted by a micro-fumbiator that constantly monitors the output of the detection device.

This system not only activates the connecting device when an abnormally large amount of flow is detected, but also allows this state to continue for a long time even if the flow is only the amount consumed by normal gas appliance combustion. If this continues for a long period of time, it is considered an abnormality and the gas can be shut off, making it highly safe.

As an emergency shutoff device operated by the output of such a detection device, one consisting of a release type electromagnet and a shutoff valve driven by the output of the electromagnet is used. As shown in FIG. 3, the magnetic force of the permanent magnet 10 built into the release type electromagnet 1 holds the shutoff valve 2 in the open state against the bias of the spring 3, and the output from the gas leak detection gM When the electromagnet 1 is energized, the magnetic force of the permanent magnet 10 is canceled by the electromagnet 1, so that the shutoff valve 2 is actuated by the spring force and comes into contact with the valve seat 4 to be in a closed state. Here, since the release type electromagnet 1 is used which operates the cutoff valve 2 by releasing it from the magnetic force of the permanent magnet 10, the cutoff valve 2 which has been activated and is in the closed state is returned to the open state. Then, it is necessary to push the shutoff valve 2 to attract it to the permanent magnet 10 again, and therefore it is necessary to provide a return means. 6 in the figure is a return axis for this return,
When the return shaft 6 is pushed in against the spring 7, the cutoff valve 2 is pushed back and reattached to the permanent magnet 10, opening the valve.

By the way, in the device having the above-mentioned return means, if the return shaft 6 is fixed in the pushed-in state, the operation of the shutoff valve is hindered, and therefore the abnormal flow of gas cannot be stopped. This is a very inconvenient situation.

For this reason, it has been proposed that the return means for returning the cutoff valve to the open state is provided with an auxiliary cutoff valve that airtightly cuts off the gas flow path in conjunction with the return operation. - example tj
Shown in Figure S4. A cylindrical body 60 having a valve 61 at one end and a return shaft 6 at the other end is inserted into the opening 5 provided in the partition 8, and is disposed between the cylindrical body 60 and the partition 8. The return spring 7 causes the cylindrical body 60 and the return shaft 6 coaxial with the cylindrical body 60 to
is biased to the right in the figure. The outer circumferential surface of the cylindrical body 60 is in contact with a sealing means 9 such as an O-ring provided on the inner circumferential surface of the opening 5 of the partition wall 6. still,
Gas flows from the right side in the figure through the inside of the cylindrical body 60 to the left side in the figure.

A release type electromagnet 1 that operates a cutoff valve 2 by the output from a gas leakage detection device has a spring 3 that urges the cutoff valve 2 provided at one end of a movable iron core 11 in the protruding direction. The excitation acts on the permanent magnet 10, which attracts and holds the movable iron core 11 against the spring 3, so as to cancel out its magnetic force. When the electromagnet 1 is energized, the movable iron core 11 is projected by the force of the spring 3 and moves the cutoff valve 2 toward the partition wall 8. As a result, the cylindrical body 6
The seal packing 14 on the face of the shutoff valve 2 comes into contact with the end face of the valve nozzle 61 of No. 0, thereby closing the gas flow path.

The shutoff valve 2 closed in this manner is returned to its original state by pushing in the return shaft 6 whose one end protrudes outside the container body. Here, the return of the shutoff valve 2 is performed by sealing means 9 on the outer peripheral surface.
The valve nozzle 61 of the cylindrical body 60 is in contact with the shutoff valve 2
This is done in a state in which the gas flow is stopped, that is, in a state where the gas flow is stopped, and the gas flow path is opened by returning the cylindrical body 60 and the return shaft 6. While the return operation is being performed, the cylindrical body 60 is in contact with the outer peripheral surface of the sealing means 9 and the shutoff valve 2.
This constitutes an auxiliary shutoff valve that hermetically shuts off the gas flow path.

<Problems to be Solved by the Invention> However, the above-mentioned method causes a new problem. In other words, if the return shaft 6 is pushed in while gas is flowing in a normal state, the valve nozzle 61 of the cylindrical body 60 that moves together with the return shaft 6 will come into contact with the shutoff valve 2 which is in the non-blocking state, causing the gas to The flow of water is interrupted. Even if the gas equipment in use goes out due to this operation, the shutoff valve will perform the shutoff operation after a while after the return shaft 6 is returned, so although there is very little danger, the normal state will be restored. To restore it, you must perform a restore operation.

The present invention has been made to solve these problems.

[Structure 1 of the Invention: Means for Solving Problem 7α] The present invention includes a shutoff valve that is operated by the release action of a release type electromagnet to perform a closing action, and also includes a return valve for returning the shutoff valve to an open state. In an emergency shut-off device, the means includes an auxiliary shut-off valve that airtightly shuts off a gas flow path in conjunction with a return operation, and the shut-off valve The shutoff valve is characterized in that the shutoff valve is provided with a release member that releases the locking means in the closed state of the shutoff valve.

According to the present invention, since the locking means is not released unless the shutoff valve is operated and the shutoff is not performed, even if an attempt is made to operate the return means when the shutoff valve is not operated, this will not occur. This is prevented by the locking means.

<Embodiment> FIG. 1 shows an embodiment of the present invention. A cylindrical body 60 having a return shaft 6 at one end is inserted into the circular opening 5 provided in the partition wall 8, and a return spring 7 disposed between the cylindrical body 60 and the partition wall 8 A return shaft 6 coaxial with this is biased to the right in the figure. And this cylindrical body 60
A sealing means 9 such as an O-ring disposed on the inner circumferential surface of the opening 5 of the partition wall 6 is in contact with the outer circumferential surface of the partition wall 6 .

The release type electromagnet 1 that operates the shutoff valve 2 by the output from the gas leakage detection device is equipped with a permanent magnet 10 and a movable iron core 11 that is attracted and held by the permanent magnet 10, as in the conventional example. A cutoff valve 2 is provided at one end of the core 11, and the cutoff valve 2 is biased in the projecting direction by a spring 3, and the excitation of the electromagnet 1 acts to cancel the magnetic force of the permanent magnet 10. has been done. A movable iron core 11, which is attracted and held by a permanent magnet 10 against a spring 3 by its magnetic force, protrudes by the force of the spring 3 when the electromagnet 1 is excited, and moves the cutoff valve 2 toward the partition wall 8. As a result, the shutoff valve 2 has a seal packing 1 provided on one side thereof.
4 is brought into contact with the valve seat 4 formed on the edge of the opening 5 to close the gas flow path.

Here, an inclined piece 20 as a release means is provided protruding from the outer peripheral edge of the shutoff valve 2, and a locking spring 21 having an S-shape is attached to the edge of the opening 5 on the shutoff valve 2 side.
is fixed. This locking spring 21, whose tip end is located within the axial projection plane of the opening 5, functions as a locking means for preventing movement of the cylindrical body 60 as an auxiliary shutoff valve.

That is, even if the return shaft 6 is pushed in when the shutoff valve 2 is in a normal state where it is not closed, the cylindrical body 60 will not reach the position where it touches the shutoff valve 2 because the leading edge of the cylindrical body 60 will be locked to the locking spring 21. It never moves. Therefore, the flow of gas is not stopped by the cylindrical body 60, which is an auxiliary shutoff valve, in a normal state.

However, when the connecting valve 2 is operated due to an abnormality in the flow of water and the shutoff valve 2 is in contact with the valve seat 4, the inclined piece 20 provided on the shutoff valve 2 is ), since the locking spring 21 is pressed and pushed out of the axial projection plane of the opening 5, when the return shaft 6 is pushed in, the cylindrical body 60 brings its tip edge into contact with the shutoff valve 2. While the valve is in the *insect position, return the shutoff valve 2 to the position (I).

While the shutoff valve 2 is being reset in this way, the cylindrical body 60 whose outer peripheral surface is in contact with the sealing means 9 is in contact with the seal packing 14 of the shutoff valve 2, that is, the gas flow is maintained. The gas flow path is opened only after the cylindrical body 60 and the return shaft 6 return to their original positions.

FIG. 2 shows another embodiment. This can be achieved by attaching a locking plate 23, which is rotatable within a predetermined angle and is biased by a spring in the direction shown by the arrow in FIG. A protruding piece 22 is provided to protrude from the front end surface of the shutoff valve 2.

As shown in FIG. 6(a), when the gas is flowing normally, the locking plate 23, which is the locking means, protrudes outward from the cylindrical body 60 due to spring bias, and therefore pushes the return shaft 6. Even if you try to insert it, the locking plate 23 hits the partition wall 8. This prevents the cylindrical body 60 from coming into contact with the cutoff valve 2 and stopping the flow of gas.

When there is an abnormality in the flow of gas and the cutoff valve 2 operates to stop the flow of gas, a protrusion 22 serving as a release means protruding from the cutoff valve 2 presses the locking plate 23 and releases the locking plate 23. , and the return shaft 6 is pushed in to prevent the locking plate 23 from protruding from the outer surface of the cylindrical body 60.
While the cylindrical body 60 contacts the cutoff valve 2 and stops the flow of water, the cutoff valve 2 is pushed back to the return position.

[Effects of the Invention] As described above, in the present invention, when the return means is fabricated in order to return the cutoff valve to the open state, the auxiliary cutoff valve provided in the return means airtightly shuts off the gas flow path. Even if the shutoff valve is fixed in the reset state by the return means and the shutoff operation by the shutoff valve is prevented,
At this time, the gas is stopped by the auxiliary shut-off valve, and it is not possible to force the gas to flow in a situation where a shut-off action is required. Not only is it highly safe against explosions, etc., but even if you try to activate the return means when gas is flowing normally, the operation of the auxiliary shutoff valve is blocked by the locking means, so the auxiliary shutoff valve will not work properly. The valve does not stop the flow of gas, and when the shutoff valve is in a state where it should be reset, the release means provided on the shutoff valve releases the locking means, so the return means does not shut off the gas. The return of the valve and the continuation of the shutoff operation during the above-mentioned return operation are not impaired by the locking means.

[Brief explanation of drawings]

Figures 1 (a) and (b) are cross-sectional views of one embodiment of the present invention, Figures 2 (a) and (b) are cross-sectional views of other embodiments, Figure 3 is a cross-sectional view of a conventional example, and Figure 4. is a sectional view of another conventional example, in which 1 is a release type electromagnet, 2 is a cutoff valve, 6 is a return shaft, 20 is an inclined piece, 21 is a locking spring, 22 is a projecting piece, and 23 is a locking plate. , 60 indicates a cylindrical body.

Claims (1)

[Claims] (1) In addition to being equipped with a shutoff valve that is activated by the release action of a release type electromagnet to perform a closing operation, a return means for returning the shutoff valve to the open state is provided so that the gas flow path is airtight in conjunction with the return operation. In an emergency shutoff device that is provided with an auxiliary shutoff valve that shuts off, a locking means that prevents the operation of the auxiliary shutoff valve when the shutoff valve is open is provided, and a release member that releases the locking means when the shutoff valve is closed is attached to the shutoff valve. A gas emergency shutoff device characterized by being provided in.