JPH0351944B2 - - Google Patents

Description

Detailed Description of the Invention [Objective of the Invention] <Industrial Application Field> The present invention is an emergency system that operates a shutoff valve to stop gas based on the output from a detection device that detects abnormal conditions related to the use of gas. The present invention relates to a shutoff device, and particularly to a gas emergency shutoff device in which a shutoff valve is operated by a release type electromagnet.

<Prior art> The above-mentioned detection device includes gas flow rate detection means;
In recent years, devices have been provided that include a monitoring device configured with a microcomputer that constantly monitors the output of the detection device. This system not only activates the shutoff device when it detects an abnormally large flow of gas, 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 it continues, 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 magnet 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 device When the electromagnet 1 is excited, the magnetic force of the permanent magnet 10 is canceled by the electromagnet 1, so that the shutoff valve 2 is operated by a spring bias and comes into contact with the valve seat 4, and is 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 it is therefore 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. An example is shown in FIG. A cylindrical body 60 having a valve nozzle 61 at one end and a return shaft 6 at the other end is inserted into the opening 5 provided in the partition wall 8, and a return spring disposed between the cylinder body 60 and the partition wall 8 7 urges the cylindrical body 60 and the return shaft 6 coaxial therewith 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. Note that the gas flows from the right side in the figure through the inside of the cylindrical body 60 to the left side in the figure.

Shutoff valve 2 is activated by the output from the gas leak detection device.
The release type electromagnet 1 that operates the is a spring 3 that urges a cutoff valve 2 provided at one end of a movable iron core 11 in the projecting direction.
The magnetic force of the permanent magnet 10, which attracts and holds the movable iron core 11 against the force of the permanent magnet 10, acts to cancel out the magnetic force of the permanent magnet 10. If electromagnet 1 is energized,
The movable iron core 11 is protruded by the force of the spring 3 and moves the cutoff valve 2 toward the partition wall 8. As a result, the seal packing 14 on one side of the cutoff valve 2 comes into contact with the end face of the valve nozzle 61 of the cylindrical body 60. This closes 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 shutoff valve 2 returns to its original state when the valve nozzle 61 of 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, when the gas flow is stopped. This is done in a stopped state, and the gas flow path is opened by returning the cylindrical body 60 and the return shaft 6. During the return operation, the cylindrical body 60 whose outer peripheral surface is in contact with the sealing means 9 and which is in contact with the cutoff valve 2 constitutes an auxiliary cutoff valve that hermetically cuts 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 someone tries to push the return shaft 6 while gas is flowing under normal conditions,
Valve nozzle 6 of cylindrical body 60 moving together with return shaft 6
1 comes into contact with the shutoff valve 2 which is in the non-blocking state and stops the flow of gas. 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 the danger is very small, but it is normal. To return to , you must perform a restore operation.

The present invention has been made to solve these problems.

[Structure of the Invention] <Means for Solving the Problems> The present invention includes a shutoff valve that is activated by the release operation of a release type electromagnet to perform a closing operation, and a return mechanism 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. The shutoff valve is characterized in that the shutoff valve is provided with a release member that releases the locking means when the shutoff valve is in the closed state.

<Operation> According to the present invention, the locking means is not released unless the shutoff valve is operated and shutoff is performed, so even if an attempt is made to operate the return means when the shutoff valve is not operated, the locking means will not be released. It can be prevented by means.

<Example> FIG. 1 shows an example 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. 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.

Shutoff valve 2 is activated by the output from the gas leak detection device.
The release-type electromagnet 1 that operates is equipped with a permanent magnet 10 and a movable iron core 11 that is attracted and held by the permanent magnet 10, and a shutoff valve 2 is provided at one end of the movable iron core 11. At the same time, the shutoff valve 2 is urged in the protruding direction by a spring 3, and the excitation of the electromagnet 1 acts to cancel the magnetic force of the permanent magnet 10. The movable iron core 11, which is attracted and held by the permanent magnet 10 against the spring 3 by its magnetic force, causes the spring 3 to move when the electromagnet 1 is excited.
The cutoff valve 2 is protruded with a force of Close the gas flow path by bringing them into contact.

Here, an inclined piece 20 as a release means is protruded from the outer peripheral edge of the shutoff valve 2, and an S-shaped locking spring 21 is attached to the edge of the opening 5 on the shutoff valve 2 side. It is fixed. This locking spring 21, whose tip is located in 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 will not be stopped by the cylindrical body 60, which is an auxiliary shutoff valve, in a normal state.

However, when the cutoff valve 2 is operated due to an abnormality in the gas flow and the cutoff valve 2 is in contact with the valve seat 4, the inclined piece 20 provided on the cutoff valve 2
As shown in FIG. b, 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 will have its tip end pressed against the shutoff valve 2. Return the shutoff valve 2 to the return position while keeping it in contact.

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 is done by attaching a locking plate 23, which is rotatable within a predetermined angle and biased by a spring in the direction shown by the arrow in FIG. A projecting piece 22 is provided to protrude from the tip end surface of 2.

As shown in Figure 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 the 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, causing the cylindrical body 60 to close to the shutoff valve 2.
This prevents the gas from coming into contact with the gas and stopping the flow of gas.

When there is an abnormality in the gas flow, the shutoff valve 2 operates,
When the gas flow is stopped, a protruding piece 22 as a release means protruding from the shutoff valve 2 presses the locking plate 23 to rotate it, and the locking plate 23 touches the outer surface of the cylindrical body 60. When the return shaft 6 is pushed in so as not to protrude, the cutoff valve 2 is pushed back to the return position while the cylindrical body 60 contacts the cutoff valve 2 and stops the flow of gas.

[Effects of the Invention] As described above, in the present invention, when the return means is operated to return the cutoff valve to the open state, the auxiliary cutoff valve provided in the return means airtightly cuts 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 shutoff valve. , it is not possible to force the gas to flow in a situation where a shutoff operation is required,
Therefore, safety against gas leaks and accompanying gas explosions is high, and even if you try to operate the return means when gas is flowing normally,
At this time, since the operation of the auxiliary shut-off valve is prevented by the locking means, the auxiliary shut-off valve does not stop the flow of gas, and when the shut-off valve should be returned to its original state, the shut-off valve Since the release means provided in the release means releases the lock means, the return means of the shutoff valve by the return means and the continuation of the shutoff operation during the above-mentioned return operation are not impaired by the lock means. .

[Brief explanation of drawings]

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

Claims (1)

[Claims] 1.Equipped with a shutoff valve that is activated by the release operation of a release type electromagnet to perform a closing operation, and a return means for returning the shutoff valve to the open state, which airtightly shuts off the gas flow path in conjunction with the return operation. In an emergency shutoff device equipped with an auxiliary shutoff valve, a locking means for preventing the operation of the auxiliary shutoff valve when the shutoff valve is open is provided, and a release member for releasing the locking means when the shutoff valve is closed is provided on the shutoff valve. A gas emergency shutoff device characterized by: