JP2000161513A - Degassing prevention implement - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small degassing prevention implement excellent in reliability which can save the energy and lengthen the life, not having such fear that the valves is closed easily regardless of no generation of an urgent state and without the case in which the gas pressure hinders the action of the valve body operation mechanism. SOLUTION: This implement has a gas flow route 11 from a gas flow in port 9 reaching a gas outflow port 10 through one part of a first through hole 4 and communication hole 5, while it is provided with a valve body 15 for opening/closing the gas flow route 11, a latching solenoid 21 for opening/closing the valve body, a spring 24 for releasing the latch for energizing the plunger 23 in the valve closing operation direction of the first piston 12, a first link mechanism 29 for connecting the plunger 23 with the first piston 12, a second link mechanism 30 for connecting the first piston 12 with the second piston 18 and control circuit for controlling the latching solenoid 21 based on the detection signal from a seismoscope.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas release preventer installed in a part of a piping system for a gas such as a fuel gas to prevent the gas from being released outside the piping system in an emergency. The present invention relates to a gas emission preventer capable of operating with high stability and reliability in a gas piping system under conditions where high-pressure gas is applied.

[0002]

2. Description of the Related Art When an earthquake occurs during use of gas such as fuel gas in general households or public facilities, forgetting to close the main valve of the gas, the gas is released and a fire or the like occurs, Gas storage containers such as gas cylinders may fall over and damage gas pipes, or the gas storage containers may fall off the main cock,
Gas is released, which may cause a secondary disaster.

In order to solve such a problem, a gas release preventing device which is installed in a part of a piping system of a gas such as a fuel gas to prevent the gas from being released outside the piping system in an emergency is conventionally provided. More variously developed.

[0004] As one of such gas emission preventers, a solenoid type is conventionally known. This solenoid type gas emission preventer has a valve body that opens and closes a gas flow path formed in a casing and a valve that is normally separated from a rear end of a valve rod connected to this valve body by a latch release spring. The operating shaft, which is urged and disposed, is provided so that the movable iron core always presses the operating shaft to contact the rear end of the valve rod and keeps the valve body in the open state, A solenoid that operates based on a signal from a sensor that detects an emergency condition. Then, when an emergency state such as an earthquake is detected by the sensor, the solenoid is excited and its movable iron core is retracted, and the operating shaft is urged by the latch release spring with this. , Whereby the valve body is closed so that the valve body is pressed against the valve seat in the gas flow path, thereby closing the gas flow path in the casing.

[0005]

However, in such a conventional gas emission preventer, only the end of the operating shaft is engaged with the valve stem connected to the valve body to open the valve. Therefore, when the pressure in the gas storage container such as a gas cylinder rises, the engagement state between the end of the operating shaft and the valve rod connected to the valve body is released due to the high gas pressure, and an emergency state does not occur. Nevertheless, there is a risk that the valve will close.

On the other hand, the movable iron core of the solenoid is held in position by being attracted to a permanent magnet provided therein, and the movable core is used to move the operating shaft against the resilient force of the latch release spring to move the valve body. It is only held in the open state. Therefore, as the solenoid, it is necessary to use a permanent magnet having an attraction force enough to withstand the resilience of the latch release spring, and to be able to exert an electromagnetic force enough to release this attraction force. There is. That is, it is necessary that the solenoid be proportional to the spring force of the latch release spring and be able to cope with it.If the latch release spring is made strong to ensure the valve closing operation, the solenoid must be enlarged. And require a lot of power.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an improved valve operating mechanism for opening and closing a gas flow passage makes it possible to easily perform a valve closing operation in spite of no occurrence of an emergency state. It is an object of the present invention to provide a highly reliable, compact, and energy-saving gas emission preventer in which gas pressure does not hinder the operation of a valve body operating mechanism, for example, there is no danger of the gas emission. I do.

[0008]

According to a first aspect of the present invention, there is provided a gas release preventing device, comprising: a first through hole having one end serving as a gas inlet; One end is communicated in the middle of the hole, the other end is a gas outlet,
A communication hole that forms a gas flow path together with a part of the first through hole, and a second through hole formed so as to extend from the middle of the communication hole toward the other end substantially in parallel with the first through hole. A body case having a hole formed therein, a valve body capable of contacting a valve seat provided in the first through hole, and opening and closing the gas flow path;
A first piston slidably disposed in the first through hole to control a valve opening / closing operation of the valve body;
A second piston slidably disposed in the through hole, a piston operating spring provided to urge the second piston toward the communication hole, and a valve opening / closing valve having an operating shaft An electric actuator, an unlatching spring for urging the operating shaft of the electric actuator in the valve closing direction of the first piston, and linking the operating shaft of the electric actuator with the first piston. A first link mechanism, a second link mechanism for linking the first piston and the second piston, a detection device for detecting a phenomenon that should prevent gas release, and a detection signal from the detection device And a control circuit that controls the electric actuator based on the first link mechanism, the first link mechanism has a first link member and a second link member, and the first link member is substantially Character And one end thereof is rotatably connected to the operating shaft of the electric actuator, and the bent portion between both ends is rotatably connected to the first fixing pin, while The other end of the first link member is rotatably connected to the other end of a second link member whose one end is rotatably connected to a rear end of the first piston, and The second link member and the second link member are positioned so that the mutual connection part has a substantially mountain shape,
The link mechanism comprises a link member, an intermediate portion in the longitudinal direction of the link member is rotatably coupled to the second fixing pin, and one end is rotatably coupled to the second piston. The other end is rotatably connected to the first piston and the second link member, and the electric actuator always has the operation shaft positioned in the valve opening direction of the first piston. While holding and opening the gas flow path by opening the valve body, the control signal from the control circuit based on the detection signal from the detection device, to release the valve body valve open holding state by the operating shaft The valve is closed by the latch releasing spring to shut off the gas flow path.

According to a second aspect of the present invention, there is provided the gas emission preventing device according to the first aspect, wherein the control circuit includes two input terminals, and a minute input terminal is provided between the input terminals. While the current is constantly supplied, the input terminal is connected to a detection device that detects a phenomenon that should prevent gas release, and a break in an electric wire between the operation or control circuit of the detection device and the detection device. And two output terminals connected to a drive circuit of the electric actuator, and the output terminal is connected to the output terminal while the input terminal is in a conductive state. During this time, no current is supplied, and the valve is kept open by the electric actuator during that time.

According to a third aspect of the present invention, there is provided the gas release preventing device according to the first or second aspect, wherein the electric actuator is substantially parallel to the first piston and the second piston. A permanent magnet having a magnetic force for attracting the plunger to latch at a position where the plunger slides in the valve opening direction of the first piston; And an electromagnetic coil that generates an electromagnetic force that repels to slide in the valve closing direction. The latching solenoid includes a permanent magnet and maintains the plunger at all times with the first piston. While the valve is in the valve opening direction, the valve body is opened, and the gas flow path is opened, the control signal from the control circuit based on the detection signal from the detection device is opened. By, by generating an electromagnetic force in the direction opposite to the magnetic force of the permanent magnet by energization of the electromagnetic coil is made, to release the latch state by the permanent magnets, by the elastic force of the latch release spring plunger,
The first piston is positioned in the valve closing operation direction, the valve body is closed, and the gas flow path is shut off.

According to a fourth aspect of the present invention, there is provided the gas emission preventing device according to the third aspect, wherein it is confirmed that the plunger has advanced to a position where the plunger is closed, and latching is performed. An operation check switch for stopping power supply to the electromagnetic coil of the solenoid is provided.

According to a fifth aspect of the present invention, there is provided a gas emission preventing device according to any one of the first to fourth aspects, wherein the gas emission preventing device detects a phenomenon in which the gas emission should be prevented. The device is characterized by being a seismic device.

According to a sixth aspect of the present invention, there is provided a gas release preventer according to any one of the first to fifth aspects, wherein the valve element is different from the first piston. It is constituted by a member, and is arranged by being urged by a valve closing spring in a direction approaching a valve seat formed in the first through hole.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail based on embodiments shown in the drawings. First, the structure of a gas emission preventer according to one embodiment of the present invention will be described with reference to FIGS.

[0015] Main body casing 1 of this gas release prevention device
Comprises a body 2 and a cover 3 fixedly attached to the rear end of the body 2 to form a predetermined space at the rear of the body 2. The body 2 has a first tubular portion 2A projecting obliquely upward and a second tubular portion 2B projecting forward.

The body 2 has a first through hole 4 having one end opened at the front end of the second cylindrical portion 2B and linearly penetrating the rear end. One end is communicated in the middle of the through hole 4, and the other end is opened at the tip of the first cylindrical portion 2 </ b> A, and the middle of the through hole 5 is rearward in parallel with the first through hole 4. And a second through-hole 6 which is extended and opened.

In this case, on the outer peripheral portion of the second cylindrical portion 2B,
A handle 7 is rotatably mounted, and a joint head 8 which also functions to prevent the handle 7 from coming off is fixedly mounted at the tip. The joint head 8 is provided with a through-hole which is formed to penetrate from one end side to the other end side and constitutes a part of the above-described first through-hole 4, and an opening at one end side of the through-hole is provided. Function as the gas inlet 9. The opening at the tip end of the communication hole 5 of the first cylindrical portion 2A serves as a gas outlet 10, and the gas outlet 10 is inserted into the main casing 1 from the gas inlet 9 via the first through hole 4 and the communication hole 5. Is provided.

The gas inlet 9 is connected to the main stopper of the gas cylinder, and the gas outlet 10 is connected to a piping system such as a pressure regulator on the gas equipment side. In addition, since the first cylindrical portion 2A is formed obliquely, there is an advantage that the operation of connecting the gas outlet 10 to a piping system such as a pressure regulator on the gas device side becomes easy. However, the shape is not limited to this, and the first cylindrical portion 2A may have a vertically raised shape.

A first piston 12 is provided in the first through hole 4 so as to be freely slidable, and a rear end portion thereof protrudes from a rear surface of the body 2. This first piston 12
The rod 13 is connected to the tip of
An O-ring 16 is mounted on the outer peripheral surface of the piston 12 as a seal member.

On the distal end side of the rod 13, a valve body 15 having a substantially cross-shaped portion 14 is provided. The valve element 15 is
A substantially cross-shaped portion 14, a substantially cross-shaped base 15C having a similar shape, a plate 15A provided at the tip of the substantially cross-shaped base 15C, and an O mounted on the outer peripheral surface of the plate 15A. And a ring 15B, which is separated from the valve seat 17 formed of an annular step formed on the inner peripheral surface of the second cylindrical portion 2B, that is, the inner peripheral surface of the first through hole 4. The valve is opened so that it is seated on the valve seat 17 to be closed. Further, a valve closing spring 15 </ b> D that biases the valve body 15 in a direction of sitting on the valve seat 17 is disposed between the valve body 15 and the gas inlet 9.

The valve-closing spring 15D includes a substantially cross-shaped portion 14 provided on the valve body 15 and a rod 13 provided on the distal end of the first piston 12, as in the present embodiment. This is necessary when separately provided, and is unnecessary when the substantially cross-shaped portion 14 of the valve body 15 and the rod 13 of the first piston 12 are integrally provided. However, as in the present embodiment, the valve element 15 (substantially cross-shaped portion 1) is used.
4) and the first piston 12 (including the rod 13)
In the case where this is configured as a separate member, considering that there is an accident that this kind of gas emission preventer breaks from the middle of the second cylindrical portion 2B to which the handle 7 is screwed, it is broken by any chance. In this case, there is an advantage that the valve body 15 is pressed against the valve seat 17 by the valve-closing spring 15D to prevent the release of gas.

A second piston 18 is slidably disposed in the second through hole 6. This second piston 18
An O-ring 19 is mounted as a seal member on the outer peripheral surface of the. The rear end of the second piston 18 protrudes from the rear surface of the body 2, and the rear end of the second piston 18 has a piston operating spring that normally urges the second piston 18 to the left in FIG. 1. 20 are interposed.

On the other hand, a latching solenoid 21 as an electric actuator for opening and closing the valve element is provided in a concave portion 2C on the rear surface of the body 2. The main body 21A of the latching solenoid 21 is fixedly mounted via a mounting member 22 in the recess 2C. A plunger (movable iron core) serving as an operating shaft that is normally attracted to a permanent magnet provided in the main body 21A and is released by being excited by an electromagnetic coil, and moves forward and backward. 23 are provided. The plunger 23 is disposed so as to extend rearward in the cover 3, and has on its outer peripheral portion a latch release spring 24 for urging the plunger 23 in a non-sucking direction (right side in FIG. 1). Is interposed.

An opening 25 for setting the plunger 23 is formed in the wall of the cover 3 facing the tip of the plunger 23. The opening 25 is opened and closed. The cap 26 is detachably mounted. In the drawing, reference numeral 27 denotes a cable led from a detection device such as a seismic device or an alarm device for detecting a phenomenon to be prevented from releasing gas, which is provided in the cover 3 and will be described later in detail. The latching solenoid 21 is connected to a substrate 28 which forms a control circuit.

The plunger 23 of the latching solenoid 21 and the first piston 12 are linked through a first link mechanism 29. Also, the first piston 1
The second and second pistons 18 are linked via a second link mechanism 30. The first link mechanism 29 further includes a first link member 31 and a second link member 32, and the second link mechanism 30 includes a link member 33.

More specifically, the first link member 31 is formed in a substantially rectangular shape, and one end of the first link member 31 is rotatably connected to a protruding portion of the plunger 23 via a pin 34. . As shown in FIG. 2, a mounting plate 35 disposed in a longitudinal direction so as to divide the inside of the cover 3 into approximately two parts is fixed inside the cover 3. The bent portion between both ends is fixed pin 3 fixed to this mounting plate 35.
6 is freely rotatable. Further, the first link member 3
1 has a second link member 3 formed in a straight line.
2 is rotatably connected to one end via a pin 38.
The other end of the second link member 32 is rotatably connected to the rear end of the first piston 12 via a pin 37. In addition, the second link member 32 and the bent portion of the first link member 31 from the bent portion to the other end are positioned so as to be substantially mountain-shaped with the pin 38 as the apex.

On the other hand, a linearly formed link member 33 constituting the second link mechanism 30 has a longitudinally intermediate portion rotatably coupled to a fixing pin 39 fixed to the mounting plate 35. Is arranged. One end of the link member 33 is rotatably connected to the rear end of the second piston 18 via a pin 40, and the other end is connected to the first piston 1
It is rotatably connected to the first piston 12 and the second link member 32 via a pin 37 connecting the second link member 32 and the second link member 32 of the first link mechanism 29.

The plunger 23 and the link mechanisms 29 and 30 are disposed in the cover 3 in one of the spaces partitioned by the mounting plate 35. In the cover 3, an auxiliary mounting plate 35 </ b> A on which the piston operating spring 20 can be elastically mounted is mounted on the mounting plate 35 adjacent to the rear end of the piston operating spring 20. A microswitch 41 as an operation check switch is provided in a space partitioned by the auxiliary mounting plate 35A. A lithium battery 42 serving as a power source for the control circuit is provided in the other space defined by the mounting plate 35. The configuration of the microswitch 41 will be described later.

Here, the mechanical operation of the gas release preventing device having the above configuration will be described. FIG. 1 shows a state where the valve body 15 is in the valve-open state. At this time, the plunger 23 of the latching solenoid 21 is located at a position attracted by the permanent magnet (the left position in FIG. 1). The gas from the gas cylinder flowing from the gas inlet 9 is supplied to the gas passage 11.
Then, the gas reaches the gas outlet 10 and is supplied to a piping system such as a pressure regulator on the gas device side connected to the gas outlet 10.

At this time, the first piston 12 and the second piston 18 are both pressed rightward in FIG. 1 by gas pressure, but the first piston 12 and the second piston 18 are Since the link members 33 constituting the second link mechanism 30 are connected in a seesaw shape by the fixing pins 39, the force exerted by the gas pressure is offset by this. Therefore, according to the present embodiment, the first piston 12, the second piston 18, and the second link mechanism 30
With the configuration described above, the force due to the gas pressure does not affect the others. In addition, since the second link mechanism 30 and the first link mechanism 29 constitute a so-called toggle mechanism, the second piston 18 is moved leftward in FIG.
Side), the urging force of the piston operating spring 20 is applied to the plunger 23 of the latching solenoid 21.
Acts in the direction of pushing into the position in the suction state. Therefore, according to the present embodiment, the latching solenoid 21
Even if the attraction force of the plunger 23 is weak, that is, even if the magnetic force of the permanent magnet is small, it can be reliably attracted and the valve-open state can be maintained.

Therefore, when a high gas pressure is applied to the valve body 15 when the pressure of the gas cylinder or the like increases, there is no possibility that the valve body 15 will be in a closed state. Regardless, there is no risk of the valve closing operation easily,
The gas pressure does not hinder the operation of the valve body operating mechanism, and a stable and highly reliable gas emission preventing device is obtained.

Here, when an earthquake or the like is detected by a seismic sensor or the like, the latching solenoid 21 is operated, and the plunger 23 is urged by the unlatching spring 24 to move in the non-sucking direction (rightward in FIG. 1). Slide to. At this time, as described above, the latching solenoid 21 of the present embodiment is used.
Is weak enough to supply a small amount of electric power to the electromagnetic coil incorporated in the main body 21A of the latching solenoid 21 for releasing the suction state. The latch release spring 24 is provided with the latching solenoid 21.
Since the plunger 23 is urged in the non-suction direction in a state where the suction force of the latch is released, it is not necessary to use a spring having a very high elasticity as the latch release spring 24. As a result, the size of the latching solenoid 21 can be reduced, power can be saved, and the size, energy saving, and life of the device can be reduced.

When the plunger 23 slides in the non-suction direction, the pin 34 moves to the right in FIG.
The link member 31 of FIG.
Rotate in the counterclockwise direction. Accordingly, the pin 38 moves downward, and one end of the second link member 32 moves downward, so that the second link member 32 rotates clockwise. As a result, the first piston 12 is pulled,
While being slid to the right in FIG. 1, the link member 33 rotates counterclockwise in FIG. 1 with the fixing pin 39 as a fulcrum, and the second piston 18 is pushed to move to the left in FIG. Will be slid.

In such an operation, as described above, the first piston 12 is pulled and slid to the right in FIG.
Are instantaneously separated from each other, so that the valve element 15 is urged by the valve-closing spring 15D and abuts on the valve seat 17 to be in a closed state, whereby the gas flow path 11 is shut off. At this time, the fixing pin 3
6. From the time when the axes of the pins 38 and 37 exceed the straight line, due to the nature of the toggle mechanism, the resilience of the piston actuating spring 20 and the valve closing spring 15D is reduced by the valve body 15, A force acts on the plunger 23 via the first piston 12, the first link mechanism 29, and the second link mechanism 30 in the non-sucking direction. Therefore, according to the present embodiment, the valve closing operation can be reliably performed.

Next, the electrical control structure of the gas emission preventing device and its operation will be described. FIG. 5 is a schematic view of the electric control structure of the gas emission preventing device, and shows the seismic sensor 4.
3 shows the relationship among the control circuit 44, the control circuit 44, the latching solenoid 21, and the microswitch (operation confirmation switch) 41.

In this figure, the control circuit 44 is provided with input terminals A and B, and a minute current is supplied between A and B. These input terminals A and B are
3, the operation of the seismic sensor 43 (vibration detection),
Alternatively, due to disconnection of the electric wire between the control circuit 44 and the seismic sensor 43, the conduction state between A and B is lost. That is, A-
The continuity between B and B is monitored, and the continuity between A and B is eliminated, so that the operation (vibration detection) of the seismic sensor 43 and the disconnection of the electric wire between the control circuit 44 and the seismic sensor 43 are detected. . The control circuit 44 is provided with output terminals C and D.
As long as there is a conduction state between B and B, a current is not conducted between C and D.

Here, the latching solenoid 21 includes a plunger 23 (movable iron core) 23, a permanent magnet 46 having a magnetic force for attracting the plunger 23 to a position where the plunger 23 is slid in the retreating direction, Magnet 46
And an electromagnetic coil 47 that generates a repulsive magnetic force that slides the plunger 23 in the forward direction in order to release the suction holding (latch) of the plunger 23 due to the above.

The electromagnetic coil 47 of the latching solenoid 21 is connected to the output terminals C and D of the control circuit 44. When there is a conduction state between A and B and there is no conduction between C and D, The latching solenoid 21 is a permanent magnet 4
6 keeps the plunger 23 latched. In this case, the plunger 23 is located at the retreat (adsorption) position, the valve body 15 is separated from the valve seat 17 and is in an open state, and the gas passage 11 is opened.

Then, as described above, when the conduction state between A and B is lost due to the operation (vibration detection) of the seismic sensor 43 or the disconnection of the electric wire between the control circuit 44 and the seismic sensor 43, It is configured such that current is supplied between C and D.
Note that a delay circuit that delays the time from when the conduction state between A and B disappears to when energization between C and D is performed is provided as necessary.

The electromagnetic coil 4 of the latching solenoid 21
Numeral 7 is configured to be energized by generating an electromagnetic force in a direction opposite to the magnetic force of the permanent magnet 46 by energizing between C and D. The latched state of the plunger 23 by 46 is released.

When the latch is released as described above, the plunger 23 slides in the non-sucking direction (to the right in FIG. 1) due to the resiliency of the latch release spring 24, and the valve body 15 moves to the valve seat 17 , And the valve is closed.
1 is shut off.

Here, the micro switch 41 as an operation check switch is interposed in an energizing circuit between the output terminals C and D of the control circuit 44 and the electromagnetic coil 47, and is in a position where the valve is closed as described above. When the plunger 23 is slid to the position, the first link member 31 constituting the first link mechanism 29 is rotated and the first link member 31 contacts the micro switch 41 as described above. The opened NC contact is opened, and the energization of the electromagnetic coil 47 of the latching solenoid 21 is stopped. Therefore, power consumption is small.

After the energization of the electromagnetic coil 47 is stopped, the spring force of the latch release spring 24 causes
The closed state of the valve body 15 is maintained. When the valve body 15 in the closed state is to be opened, the cap 26 is removed, and then the plunger 23 is pushed by a person's finger to slide in the retreating direction to be in the latched state.

In this case, as described above, due to the operation (vibration detection) of the seismic sensor 43 or the disconnection of the electric wire between the control circuit 44 and the seismic sensor 43, the conduction state between A and B disappears. In this case, although the plunger 23 is temporarily in the latched state, the energization between A and B is not performed and the energization is performed between C and D, so that the plunger 23 moves from the valve closing position. When the NC contact of the micro switch 41 changes from the open state to the closed state, the electromagnetic coil 47 is energized, and the latch state of the plunger 23 by the permanent magnet 46 is released. That is, the latch state is not maintained.

On the other hand, when there is a conduction state between AB,
Even if the power is not supplied between C and D, even if the plunger 23 moves from the valve closing position, power is not supplied to the electromagnetic coil 47, and the plunger 23 can be latched by the permanent magnet 46. This latch state can be maintained. Therefore, after the occurrence of the accident, the valve body 15 is kept in the closed state, and the release of gas can be prevented unless the cause is reliably reset or the cause of the accident is eliminated.

When the gas pressure at the gas inlet 9 is higher than the gas pressure at the gas outlet 10 when the valve is closed,
The valve body 15 has a force in the valve closing direction according to the gas pressure difference and the cross-sectional area of the flow path in the portion where the valve seat 17 is formed, and a valve closing direction due to the elastic force of the valve closing spring 15D. Have received power. By slightly pushing the plunger 23 as described above, the valve body 15 moves in the valve opening direction via the link mechanisms 29, 30 and the first piston 12, and the gas flow path 1
If 1 is slightly opened, the pressure between the gas inlet 9 and the gas outlet 10 becomes equal, so that the force in the valve closing direction due to the gas pressure difference disappears. On the other hand, the first piston 12 and the second piston 18 also receive gas pressure, but the second link mechanism 30
Does not affect the force required for the reset operation. That is, even when a high-pressure gas is supplied to the gas inlet 9 at the time of the reset operation, a pressing force corresponding to the supplied gas pressure is applied to the plunger 23 until the gas flow path 11 is slightly opened. If added, then, since the gas pressure does not affect the force required for operation, the force pushing the plunger 23 is
A small force enough to compress the latch release spring 20, the piston operation spring 24, and the valve closing spring 15D can be used. If the gas does not actually leak or be consumed downstream of the gas outlet 10 after the valve is closed, no difference appears between the gas pressures at the gas outlet 10 and the gas inlet 9. Therefore,
In this case, the force for pushing the plunger 23 at the time of resetting is small enough to compress the springs 20, 24, and 15D from the start of pushing until the completion of resetting.

[0047]

According to the gas release preventer of the present invention, the valve closing mechanism can be easily closed in spite of no occurrence of an emergency due to the improvement of the operation mechanism of the valve for opening and closing the gas flow path. There is no case where the gas pressure does not hinder the operation of the valve body operating mechanism, for example, and there is no reliability, and it is possible to achieve high reliability, small size, energy saving and long life.

In this case, the control circuit is configured to detect the operation of a detecting device for detecting a phenomenon such as an earthquake which should prevent the release of gas or to detect a disconnection of an electric wire between the control circuit and the detecting device. When there is no conduction between the input terminals, current is not supplied between the output terminals. When there is no current between the output terminals, the valve state of the valve body is maintained by the electric actuator. If configured, not only when a phenomenon such as an earthquake that should prevent gas release is detected, but also at the time of disconnection, gas release prevention is executed,
Safety can be further improved.

The electric actuator for opening and closing the valve element can be constituted by a latching solenoid including a plunger, a permanent magnet, an electromagnetic coil and the like, and controls the opening and closing of the valve element simply and reliably. be able to. In this case, it is preferable to provide an operation check switch that stops the energization of the solenoid coil of the latching solenoid after confirming that the plunger has advanced to the position where the valve is in the closed state. Power consumption can be suppressed.

Further, a seismic sensor can be provided as a detecting device for detecting a phenomenon that should be prevented from releasing the gas, whereby the gas can be prevented from being released when a disaster such as an earthquake occurs. Performance can be improved.

[Brief description of the drawings]

FIG. 1 is a front cross-sectional view of one embodiment of a gas emission preventer according to the present invention.

FIG. 2 is a partial cross-sectional plan view of the gas release preventing device of the above.

FIG. 3 is a left side view of the gas emission preventer according to the first embodiment.

FIG. 4 is a right side view of the gas emission preventer according to the first embodiment.

FIG. 5 is a schematic diagram of an electrical control structure of the gas emission preventer.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 body casing 9 gas inlet 10 gas outlet 11 gas flow path 12 first piston 15 valve body 17 valve seat 18 second piston 21 latching solenoid 23 plunger 24 latch release spring 29 first link mechanism 30 first 2 link mechanism 41 micro switch 43 seismic sensor 44 control circuit 46 permanent magnet 47 electromagnetic coil

Continuing on the front page (72) Inventor Tatsuo Terada 12-1 Ichiriyama-cho, Kariya-shi, Aichi Prefecture Shinko Metal Industry Co., Ltd. (72) Inventor Keiji Hashimoto 144 Imai-cho, Isesaki-shi, Gunma Kogax Corporation F term (reference) 3H061 AA02 AA08 BB02 CC12 CC25 CC30 DD03 EC05 EC23 EC24 GG05 GG17 3H106 DA07 DA12 DA23 DA26 DB12 DB22 DB32 DC02 DC17 DD12 EE22 EE34 EE45 EE48 GA08 GC25 KK15

Claims (6)

[Claims] 1. A first through hole having one end serving as a gas inlet, one end communicating with the first through hole in the middle of the first through hole, and the other end serving as a gas outlet. A communication hole which forms a gas flow path together with a part thereof, and a second through hole formed so as to extend from the middle of the communication hole toward the other end substantially in parallel with the first through hole are formed. A main body case, a valve body capable of abutting on a valve seat provided in the first through-hole, and opening and closing the gas flow path, slidably disposed in the first through-hole, A first piston that controls opening and closing operations of the valve element, a second piston that is slidably disposed in the second through-hole, and a second piston that is disposed on a communication hole side. A piston operation spring provided so as to be able to be urged, an electric actuator for opening and closing a valve body having an operation shaft, and the electric actuator A latch release spring that urges the operating shaft of the tutor in the valve closing direction of the first piston, a first link mechanism that links the operating shaft of the electric actuator and the first piston, The second linking the first piston and the second piston
A link mechanism, a detecting device for detecting a phenomenon to prevent gas release, and a control circuit for controlling an electric actuator based on a detection signal from the detecting device, wherein the first link mechanism includes: It has a first link member and a second link member, and the first link member is formed in a substantially rectangular shape, and one end of the first link member is freely rotatable about the operating shaft of the electric actuator. And a bent portion between both ends is rotatably connected to the first fixing pin, while the other end of the first link member has one end thereof at the rear end of the first piston. Is rotatably connected to the other end of the second link member rotatably connected to the first link member, and the first link member and the second link member have a substantially mountain-shaped mutual connection portion. The second link mechanism is moved from the link member The intermediate portion in the longitudinal direction of the link member is rotatably connected to the second fixing pin, one end is rotatably connected to the second piston, and the other end is the first pin. The electric actuator is always rotatably coupled to the piston and the second link member, and the electric actuator normally holds the operation shaft in the valve opening operation direction of the first piston to open the valve body. While releasing the gas flow path, the control signal from the control circuit based on the detection signal from the detection device releases the valve body valve holding state by the operating shaft, and the valve by the latch release spring. A gas release preventer configured to shut off a gas flow path in a body closed state. 2. The gas emission preventing device according to claim 1, wherein the control circuit has two input terminals, and a minute current is constantly supplied between the input terminals, and the input terminals are: It is connected to a detection device that detects a phenomenon that should prevent the release of gas, and the conduction state between the input terminals is eliminated by the operation of the detection device or the disconnection of the electric wire between the control device and the detection device. The electric actuator is provided with two output terminals connected to a drive circuit of the electric actuator, and when there is a conduction state between the input terminals, current is not supplied between the output terminals. A gas emission preventing device configured to maintain a valve-open state of a valve element according to (1). 3. The gas emission preventer according to claim 1, wherein the electric actuator is a plunger as an operating shaft extending substantially parallel to the first piston and the second piston. A permanent magnet having a magnetic force for attracting the first piston to a position slid in the valve opening direction of the first piston, and
And a solenoid coil configured to generate an electromagnetic force that repels to slide in the valve closing direction of the piston. The latching solenoid is always maintained by a permanent magnet and the plunger is moved to the first position. In the valve opening direction of the piston, the valve body is opened and the gas flow path is opened, and the electromagnetic coil is energized by a control signal from the control circuit based on a detection signal from the detection device. Is performed, an electromagnetic force in the direction opposite to the magnetic force of the permanent magnet is generated, the latched state by the permanent magnet is released, and the plunger is closed by the resilience of the latch releasing spring to close the first piston. Located in the valve operating direction,
A gas emission preventer configured to close a valve body to shut off a gas flow path. 4. The gas emission preventing device according to claim 3, wherein the operation of confirming that the plunger has advanced to a position at which the plunger is closed and stopping the energization of the electromagnetic coil of the latching solenoid is confirmed. A gas emission prevention device comprising a switch. 5. The gas release preventive device according to claim 1, wherein the detecting device for detecting a phenomenon in which gas release is to be prevented is a seismic device. Outgassing prevention device. 6. The gas release preventer according to claim 1, wherein the valve body is formed of a member different from the first piston, and is provided in the first through hole. A gas emission preventing device, which is urged by a valve closing spring in a direction approaching a formed valve seat.