JP2021116900A - Breakage type gas release preventer - Google Patents

Abstract

To provide a breakage type gas release preventer that can automatically prevent gas leakage.SOLUTION: A breakage type gas release preventer 1 comprising a first part 11 and a second part 12 is provided in a part connecting a gas container and a switching regulator 2, and the first part 11 and the second part 12 are connected by a connection pipe 31. A release prevention mechanism 16 is constituted in the connection pipe 31 on the side of the first part 11, and a check valve 25 is constituted in the connection pipe 31 on the side of the second part 12. A weak part 14 serving as a breakage part 13 is formed in a part of the connection pipe 31 located between the first part 11 and the second part 12. When the breakage part 13 is broken, gas from the gas container is prevented from being released to the outside by operation of the release prevention mechanism 16, and gas flowing back from the switching regulator 2 is prevented from being released to the outside by operation of the check valve 25.SELECTED DRAWING: Figure 2

Description

The present invention is arranged in a gas supply pipeline connecting a gas container and a switching regulator, and an impact load due to a falling object due to an earthquake, a flying object due to a strong wind, or a lump of snow is applied to the gas supply pipeline. The present invention relates to a breakable gas release preventer capable of preventing gas leakage even if the gas supply pipeline is broken.

Conventionally, when an impact force consisting of a falling object due to an earthquake, a flying object due to a strong wind, or a lump of snow is applied to the gas supply pipeline connecting the gas container and the switching regulator, the gas supply pipeline is deformed. There is a concern that gas leaks may occur due to damage or breakage caused by the gas.

However, it is not possible to identify at which part of the gas supply pipeline the gas leak occurs when the above impact force is applied until the gas leak actually occurs, and it is not possible to predict the location of the gas leak. The current situation is that it is difficult. It can be said that it may occur at the joint part of the pipe where concentrated load is likely to occur, but it is hard to say that gas leakage actually occurs at that location.

As a breakage type gas release preventer, when an impact force due to a falling object due to an earthquake, a flying object due to a strong wind, or a lump of snow is applied to the gas supply pipeline, deformation or breakage is automatically performed at a specific position. A gas leak prevention valve (see Patent Document 1) that is designed to be generated has been proposed.

JP-A-2002-34028

As shown in FIG. 12, the gas leak prevention valve 50 described in Patent Document 1 is provided at a connection portion between a gas container (not shown) and a switching regulator 60 arranged on the left side of the drawing. That is, the gas supplied from the gas container (not shown) flows from the left side to the right side in FIG.

One end of the gas leak prevention valve 50 is attached to the gas container, and the switching regulator 60 is cantilevered and supported at the other end. The gas leak prevention valve 50 is formed with a thin-walled portion 52 formed of an annular notch around the valve body, and a valve seat 53 is formed inside the valve body. A ball-shaped valve 54 is loaded on the upstream side of the valve seat 53, and a valve push rod 55 (see FIG. 13) provided with radial fins 56 for ensuring gas flow is on the downstream side. It is fitted.

In the normal gas supply state, the valve push rod 55 maintains a state in which the ball-shaped valve 54 is pressed to the upstream side of the supplied gas flow via the intermediate rod 57, and the gas from the gas container is maintained. The supply flow path of the above is in an open state. At this time, the gas supplied from the gas container (not shown) is supplied to the switching regulator 60 through the radial fins 56 provided on the valve push rod 55.

Here, when the switching regulator 60, which is cantilevered and supported by the gas container via the gas leak prevention valve 50, receives an impact due to a falling object due to an earthquake, a flying object due to a strong wind, or a lump of snow, gas leakage prevention is performed. The thin-walled portion 52 of the valve 50 is deformed to form a gap in the valve body, or the valve body is broken at the thin-walled portion 52. As a result, the valve push rod 55 swings and does not push the intermediate rod 57. As a result, the state in which the ball-shaped valve 54 is separated from the valve seat 53 is released, and the ball-shaped valve 54 comes into close contact with the valve seat 53 due to the gas pressure from the gas container (not shown). Then, the supply of gas from the gas container is cut off.

In the gas leak prevention valve 50 described in Patent Document 1, when an impact force due to a falling object due to an earthquake, a flying object due to a strong wind, a lump of snow, or the like acts on the switching regulator 60, the switching regulator 60 is deformed. This breaks the gas leak prevention valve 50 to prevent the gas supplied from the gas container from being released to the outside.

However, since gas is present in the gas leak prevention valve 50, when the thin-walled portion 52 is deformed and the gas leak prevention valve 50 is deformed in the thin-walled portion 52, it is present in the switching regulator 60. The depressurized low-pressure gas flows back to the deformed part and is released to the outside.
The switching regulator 60 is a device capable of reducing the pressure of the high-pressure gas supplied from the gas container and supplying it as low-pressure gas to a gas appliance or the like.

Since the switching regulator 60 described in Patent Document 1 is configured as a single-stage switching regulator 60 having only one inlet for supplying gas, a spare gas container cannot be connected. Therefore, when the supply pressure cannot be maintained only by the supply from the gas container in use, the gas cannot be replenished from the spare gas container.

Therefore, although the configuration is different from that of the switching regulator 60, a spare gas container can also be connected, and when the supply pressure cannot be maintained only by supplying from the gas container in use, gas is supplied from the spare gas container. The configuration of the switching regulator capable of replenishing the gas will be described in the following paragraphs (0029) to (0039) together with the operating principle thereof with reference to FIG.

According to a survey by the High Pressure Gas Safety Association, 29 accidents occurred as missing snow damage items from November 2017 to March 2018, and 6 of them directly connected the gas container and the switching regulator. It has been reported that breakages have occurred in the equipment.

Since gas is present in the switching regulator although the pressure is reduced, if the gas leak prevention valve 50 described in Patent Document 1 is connected to the switching regulator, the above-mentioned breakage will occur. Although it is possible to block the release of gas supplied from the gas container when an accident occurs, the gas existing inside flows back to the broken part from the switching regulator side and continues to be released to the outside. It will be.

Further, in the gas leak prevention valve 50 described in Patent Document 1, the ball-shaped valve 54 is maintained at a position separated from the valve seat 53 by the valve push rod 55 via the intermediate rod 57 under normal use conditions. Has been done. Therefore, even if the thin portion 52 of the gas leak prevention valve 50 is deformed by the earthquake and no gap, crack, or break is formed in which the gas flows out, the contact state between the valve push rod 55 and the intermediate rod 57 is released. Then, the ball-shaped valve 54 comes into close contact with the valve seat 53 due to the gas pressure from the gas container. As a result, the supply of gas from the gas container is cut off. In particular, since the valve push rod 55 is formed in a rod shape, there is a high possibility that the contact state between the valve push rod 55 and the intermediate rod 57 may come off due to an impact such as an earthquake.

When the contact state between the valve push rod 55 and the intermediate rod 57 is released inside the valve body in this way, the gas supply from the gas container continues to be cut off even after the end of the earthquake, and the gas container continues to be cut off. It becomes difficult to determine the cause of the gas cutoff from the gas. Further, even if it is predicted that the contact state between the valve push rod 55 and the intermediate rod 57 in the gas leak prevention valve 50 is released, which may be the cause of the gas being shut off, the gas leak prevention valve 50 is used. The cause cannot be investigated until it is replaced with a new one. Therefore, it takes cost, labor, and time to restart the gas supply from the gas container.

The present invention is a breakage type gas release preventer that can solve the above-mentioned conventional problems and can be arranged at the connection portion between the switching regulator and the gas container, and is a falling object due to an earthquake, a flying object due to a strong wind, or a flying object. When the breakage type gas release preventer is affected by the impact force due to the lump of snow, etc., prevent the release of gas from the gas container and also prevent the release of gas flowing back from the switching regulator side. Can be done. Moreover, if the breakage type gas release preventer is not broken or a gap is formed only by the shaking of the earthquake, the gas flow from the gas container will not be blocked. An issue is to provide a breakable gas release preventer having such a function.

The object of the present invention can be achieved by the breakage type outgassing preventer according to claims 1 to 6.
That is, the present invention is a breakable gas release preventer provided at a connection portion between a switching regulator for reducing the pressure of high-pressure gas supplied from a gas container and the gas container.
The breakage type gas release preventer is composed of a breakage portion that breaks due to a bending load, a first portion on the gas container side and a second portion on the switching regulator side with the breakage portion as a boundary.
Normally, the first portion allows the supply of gas from the gas container to the switching regulator, and when the broken portion is broken, the gas from the gas container is prevented from being released to the outside. A prevention mechanism is provided,
The second portion normally allows the flow of high-pressure gas from the gas container to the switching regulator, and when the broken portion is broken, the gas from the switching regulator side is released to the outside. The most important feature is that a check valve is provided to prevent this.

With the breakage type gas release preventer of the present invention, even if the broken part is broken due to the influence of impact force such as a falling object due to an earthquake, a flying object due to a strong wind, or a lump of snow, the gas from the gas container is released from the gas container. This prevents the gas from being released to the outside, and moreover, the gas flowing back from the switching regulator side can be prevented from being released to the outside by the check valve. That is, it is possible to reliably prevent the gas from being released to the outside from the broken portion.

As a breakage type gas release preventer, one end is supported by the gas flow path on the second site side with the broken point as a boundary, and the other end is a stopper protruding into the gas flow path on the first site side. A sheet surface formed on the broken portion side in the gas flow path of one portion and a ball disposed in the gas flow path of the first portion and in contact with the other end of the stopper and separated from the seat surface. It can be configured to be prepared.

Then, one end of the stopper is configured to be supported by the gas flow path on the second part side in a state where the gas flow in the gas flow path on the first part side is allowed, and when the broken part is broken, the stopper The other end of the ball is out of contact with the ball, and the ball can be pressed against the seat surface by the gas pressure from the gas container.

With this configuration, when the broken part breaks and the contact state between the stopper and the ball is released, the broken gas release preventer prevents the gas in the gas container from being released to the outside. can. Moreover, unlike the gas leak prevention valve 50 described in Patent Document 1, the intermediate rod 57, which is an unstable existence, is not interposed between the valve push rod 55 and the ball-shaped valve 54, so that an earthquake can occur. In the present invention, the operation between the stopper and the ball is stable without causing a malfunction due to shaking or the like.

It is a side view which shows the overall arrangement structure which supplies gas from a gas container. (overall structure) It is sectional drawing of the switching regulator and the break-type gas emission prevention device. (Embodiment 1) It is sectional drawing which shows the broken state of the broken type gas discharger. (Embodiment 1) FIG. 4A is a cross-sectional view of a main part showing a check valve, FIG. 4B is a perspective view showing a valve body structure of the check valve, and FIG. 4C is a release prevention mechanism. It is a perspective view which shows the main part of. (Embodiment 1) 5 (a) is a cross-sectional view showing an operating state of the check valve, FIG. 5 (b) is a cross-sectional view showing a release prevention mechanism, and FIG. 5 (c) is a release prevention mechanism at the time of breakage. It is sectional drawing which shows. (Embodiment 1) It is sectional drawing of the switching regulator and the break type gas discharger. (Embodiment 2) It is sectional drawing which shows the broken state of the broken type gas discharger. (Embodiment 2) It is sectional drawing which shows the main part of the check valve and the release prevention mechanism. Embodiment 2) It is sectional drawing which shows the broken state of the broken type gas discharger. (Embodiment 2) It is a perspective view which shows the main part of the check valve and the release prevention mechanism. (Embodiment 2) FIG. 11-1 is a diagram of the operating principle of the switching regulator, in which FIG. 11-1 supplies gas for the entire consumption amount only on the use side, and FIG. 11-2 supplies gas from both the use side and the spare side. In this case, FIG. 11-3 shows the case where the switching lever is operated to switch from the use side to the spare side before the gas container is replaced, and FIG. 11-4 shows the spare side after the gas container is replaced. It shows the state of supplying gas from the gas container. It is sectional drawing of the switching regulator and a gas leak prevention valve. (Conventional example) It is a perspective view of a valve push rod. (Conventional example)

Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings. The breakable gas release preventer according to the present invention is connected between a gas container such as an LP gas container and a switching regulator, and the switching regulator is cantilevered and supported by the gas container via the breakable gas release preventer. ing.
In the configuration of the breakage type gas release preventive device in each embodiment described below, the illustration of the two gas containers 3a and 3b connected to the switching regulator 2 is omitted except for FIG. , The gas container in use is represented by reference numeral 3a, and the spare gas container is represented by reference numeral 3b.

As for the configuration of the breakage type outgassing preventer according to the present invention, any configuration other than the configurations shown in the following examples can satisfy the technical idea of the present invention and solve the problems of the present invention. , The configuration is not limited to the one described below, and various changes can be made.
Hereinafter, a configuration using a switching adjuster to which a spare gas container can be connected will be described with respect to a preferred embodiment of the present invention, but the breakable gas release preventive device according to the present invention will be described in Conventional Example 1. It can also be used for such single-stage switching regulators.
[Embodiment 1]

The configuration of the breakage type gas release preventive device 1 according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 5. FIG. 1 shows an overall arrangement configuration for supplying gas from the gas container 3a, and shows a configuration in which two gas containers 3a and 3b are arranged. The gas container 3a indicates a gas container in use, and the gas container 3b indicates a spare gas container.

The gas container 3a cantileveredly supports the switching regulator 2 via a breakable gas release preventer 1, and the gas container 3b is connected to the switching regulator 2 via a high-pressure hose 6. The high-pressure gas selectively supplied from the gas containers 3a and 3b is decompressed by the switching regulator 2, and the medium-pressure gas is then decompressed by a decompressor (not shown) and passes through the low-pressure hose 4 in a state of becoming a low-pressure gas. Is supplied to the gas meter 5. The low-pressure gas that has passed through the gas meter 5 is supplied to a household gas appliance or the like (not shown).

(Operating principle of switching regulator)
11-11 to 11-4 show a schematic configuration diagram of the operating principle of the switching regulator 2. In the switching regulator 2, high-pressure gas (black arrow pointing to the left) from the gas container 3a of FIG. 1 arranged on the A side of the figure is supplied via the breakage type gas release preventer 1 shown in FIG. High-pressure gas (white arrow pointing to the right) from the flow path 48a and the spare gas container 3b of FIG. 1 arranged on the B side of the figure is supplied via the high-pressure hose 6 shown in FIG. The flow path 48b, the decompression chamber 47 for depressurizing the high-pressure gas selectively supplied from the gas containers 3a and 3b, and the medium-pressure gas (black arrow pointing to the right) from the decompression chamber 47 flow out to the C side in the figure. It is composed of a flow path 48c. The flow path 48c is connected to the low pressure hose 4 shown in FIG. 1 via a decompressor (not shown). The low-pressure gas decompressed by the decompressor (not shown) is supplied to the gas meter 5 via the low-pressure hose 4 as shown in FIG.

The switching regulator 2 describes a configuration in which the high-pressure gas supplied from the gas container is depressurized to a medium-pressure gas, but if necessary, the switching regulator 2 is supplied from the gas container as a configuration. It is also possible to reduce the pressure of the high-pressure gas to the low-pressure gas in multiple stages.

As shown in FIG. 11-1, the high-pressure gas supplied from the gas container 3a on the A side to the flow path 48a is decompressed by the nozzle 42a and flows into the decompression chamber 47. The opening amount of the nozzle 42a is adjusted by the position of the tip of the valve stem 43a which is urged upward by the compression spring 49a. The tip of the valve stem 43a is in contact with the cam surface 44, and the position of the cam surface 44 in contact with the tip of the valve stem 43a is the spring force of the adjusting spring 45 urging the center rod 41. And the diaphragm 46.

The decompression chamber 47 is formed as a space surrounded by a housing on the lower side of the switching regulator 2 and a diaphragm 46. The diaphragm 46 is urged in a direction of reducing the volume of the decompression chamber 47 (downward in FIG. 11) by the adjusting spring 45 and the atmospheric pressure, and when the pressure in the decompression chamber 47 becomes lower than the reference pressure. The valve rod 43a is moved downward by the pressing force from the cam surface 44, and the opening area of the nozzle 42a is increased. When the cam surface 44 is lowered, the cam surface 44 also comes into contact with the valve rod 43b, and the valve rod 43b is lowered to open the opening area of the nozzle 42b. Then, as shown in FIG. 11-2, the gas supply can be started from the spare gas container 3b arranged on the B side.

FIG. 11-1 shows a state in which the valve rod 43a is pressed by the cam surface 44 to form a gap in the nozzle 42a, whereby the high-pressure gas supplied from the A side is depressurized by the nozzle 42a. It flows into the decompression chamber 47. The medium pressure gas that has flowed into the decompression chamber 47 becomes a reference pressure and flows out from the C side.

Due to the shape of the cam surface 44, the tip of the valve rod 43b provided in the flow path 48b is in a non-contact state with the cam surface 44, so that the valve rod 43b is a nozzle 42b leading to the decompression chamber 47 (FIG. 11-1) is in a closed state.

FIG. 11-2 shows a state when the pressure of the high-pressure gas from the gas container 3a arranged on the A side during use is lower than the predetermined gas pressure, and the pressure in the decompression chamber 47 is shown. It shows a state in which the pressure in the decompression chamber 47 is to be increased by replenishing the high pressure gas from the B side in which the spare gas container 3b is arranged so that the pressure drops below the reference pressure and does not drop any more. ing.

When the state shown in FIG. 11-2 is reached, the switching lever 7 of the switching adjuster 2 is switched to the state shown in FIG. 11-3. In this state, the pressure in the decompression chamber 47 returns to the reference pressure by the gas replenished from the spare gas container 3b. Then, the gas container 3a arranged on the A side whose pressure drops below a predetermined pressure is replaced after switching the switching lever 7 as shown in FIG. 11-4.

FIG. 11-3 shows a state in which the cam surface 44 is switched by the switching lever 7, the valve rod 43b is pressed by the switched cam surface 44, and a gap is formed in the nozzle 42b. At this time, the high-pressure gas supplied from the B side to the flow path 48b is decompressed by the nozzle 42b and flows into the decompression chamber 47. The medium-pressure gas that has flowed into the decompression chamber 47 becomes a reference pressure and flows out to the C side through the flow path 48c. At this time, the nozzle 42a is in a shielded state.

FIG. 11-4 shows a state in which the gas container 3a on the A side whose pressure has dropped below a predetermined pressure is replaced and the high-pressure gas from the gas container 3b on the B side, which was the spare side, is used. Shown. The exchanged high-pressure gas from the gas container 3a on the A side is supplied to the flow path 48a, but flows until the gas pressure supplied from the spare gas container 3b drops below a predetermined reference pressure. The nozzle 42a of the road 48a is maintained in a closed state.

The switching operation of the switching lever 7 may be manually performed as the configuration of the switching adjuster 2, or if necessary, for example, the pressure in the decompression chamber 47 may be measured and the switching operation may be automatically performed. You can also leave it at.

(Structure of breakable gas release preventer)
The configuration of the breakage type outgassing preventer 1 will be described with reference to FIGS. 2 to 5. In addition, in FIG. 2, FIG. 3, and FIG. 5, the top and bottom in the vertical direction are shown upside down. That is, FIGS. 3, 5 (a) and 5 (c) show a state in which an impact load acts on the switching regulator 2 from the lower left to the upper right of the figure, and at this time, the switching regulator 2 is shown in the figure. Rotate clockwise. In this case, the top and bottom are shown upside down in order to make it easy to understand the operating state of the breakage type gas release preventive device 1 when the impact load acts on the switching regulator 2.

As shown in FIG. 2, the arrangement configuration of the switching regulator 2 and the breakable gas release preventer 1 and the high pressure hose 6 connected to the switching adjuster 2 is the same as the arrangement configuration shown in FIG. There is. The switching adjuster 2 is cantilevered and supported in a gas container 3a (not shown) by a breakable gas release preventer 1.

The breakage type gas release preventer 1 has a configuration including a first portion 11 connected to a gas container 3a (not shown) and a second portion 12 connected to the switching regulator 2, and the first portion 11 and the first portion 12 are provided. The two sites 12 are connected by a connecting pipe 31, and a gas flow path 17 is formed in the connecting pipe 31. Further, a fragile portion 14 is formed in the connecting pipe 31 that connects the first portion 11 and the second portion 12.

The fragile portion 14 is configured as a broken portion 13 that breaks due to the influence of the impact load when a falling object due to an earthquake, a flying object due to a strong wind, or a lump of snow is in contact with the switching regulator 2 and an impact load is applied. Has been done. That is, the cantilevered switching adjuster 2 bends around the fragile portion 14 of the broken portion 13, so that the broken portion 13 is broken.
Further, the fragile portion 14 may be formed as an annular recessed groove on the outer peripheral portion of the connecting pipe 31, or may be formed as an annular notch.

The first portion 11 is provided with a release prevention mechanism 16 for preventing the high-pressure gas supplied from the gas container 3a in use (not shown) from being released to the outside when the broken portion 13 is broken. There is. The release prevention mechanism 16 includes a stopper 20 composed of a support rod 21 in which one end is supported in the connecting pipe 31 near the second portion 12 and the other end protrudes into the connecting pipe 31 on the first portion 11 side. The seat surface 24 formed on the broken portion 13 side in the connecting pipe 31 on the 1st site 11 side and the seat surface which is disposed in the connecting pipe 31 on the 1st site 11 side and abuts on the other end of the support rod 21. It is configured to include a ball 23 regulated to be separated from 24.

As shown in FIG. 4C, the stopper 20 allows the flow of gas and is fitted to the portion of the connecting pipe 31 on the second portion 12 side with the slit fitting portion 22 and the first portion 11 side. It is configured to have a support rod 21 that can project into the connecting pipe 31 of the above. The outer diameter of the support rod 21 is formed to be smaller than the inner diameter of the connecting pipe 31.

As shown in FIG. 5B, the ball 23 can move freely in the connecting pipe 31 on the first portion 11 side, and the position of the connecting pipe 31 separated from the seat surface 24 by the tip of the support rod 21. It can freely move between the pressing member 15 arranged at the end. The outer peripheral diameter of the ball 23 is formed to be smaller than the inner diameter of the connecting pipe 31 on the first portion 11 side. The pressing member 15 that prevents the ball 23 from coming out of the connecting pipe 31 on the first portion 11 side has, for example, a configuration in which a plurality of through holes formed in a honeycomb shape in the axial direction are formed. It is configured to allow the flow of gas.

As shown in FIGS. 4A and 4B, the check valve 25 slidably accommodates the valve rod 27 having the valve body portion 26 at one end and the valve rod 27 in the axial direction. It is configured to include a case 28 with slits in which a plurality of slits are formed, and a compression spring 29 for urging the valve rod 27 to the bottom surface side of the case 28 with slits. The case 28 with a slit has a bottomed tubular shape, and a flange portion that expands outward is formed around the opening. A slit formed in the axial direction is formed in the tubular body.

By fitting the flange portion into the concave groove formed on the inner surface of the connecting pipe 31 on the second portion 12 side, the case 28 with a slit can be prevented from coming off and positioned. When fitting the flange portion into the concave groove formed on the inner surface of the connecting pipe 31 on the second portion 12 side, the diameter of the flange portion side is reduced by utilizing the slit formed in the tubular body portion. By doing so, the flange portion inserted into the connecting pipe 31 can be fitted into the concave groove formed on the inner surface of the connecting pipe 31.

An opening of a flow path 17 through which gas flows is formed on the bottom surface of the cylinder, and a valve seat 30 is formed in this opening as shown in FIG. 5 (a). When the valve body portion 26 comes into contact with the valve seat 30, the flow path 17 formed in the connecting pipe 31 through which the gas flows can be blocked.

(Activation of the breakage type gas release preventer at the time of breakage)
As shown in FIG. 3, when an impact load acts on the switching regulator 2 and the switching regulator 2 rotates in the clockwise direction in the figure to bend the broken portion 13, the release prevention mechanism 16 shows FIG. As shown in (c), the second portion 12 also rotates in the clockwise direction in the figure, and the slit fitting portion 22 of the support rod 21 fitted to the portion of the connecting pipe 31 on the second portion 12 side. Rotates clockwise in the figure. Then, the support rod 21 is bent by the impact load, and the contact state between the tip end portion of the support rod 21 and the ball 23 is released. The ball 23, which has been deregulated by the support rod 21, comes into close contact with the seat surface 24 due to the gas pressure from the gas container 3a, and prevents the gas from the gas container 3a (see FIG. 1) from being released to the outside. ..

At this time, the switching regulator 2 is in the same situation as shown in FIG. 11-2, and the gas in the decompression chamber 47 passes through the nozzle 42a, the flow path 48a, and the broken portion of the connecting pipe 31. It will flow out to the 13 side. The valve body rod 27 of the check valve 25 moves to the right in FIG. 3 due to the pressure of the gas flowing out through the flow path 48a. As the valve body rod 27 moves, as shown in FIG. 5A, the valve body portion 26 of the valve body rod 27 comes into close contact with the valve seat 30 formed at the bottom of the slitted case 28. As a result, the gas passing through the flow path 48a of the switching regulator 2 is prevented from being discharged to the outside by the check valve 25.

(effect)
Even if the breakage type gas release preventer 1 is affected by the impact of a falling object due to an earthquake, a flying object due to a strong wind, or a lump of snow, and the broken part 13 is broken, the gas from the gas container 3a used. Is prevented from being released to the outside by the release prevention mechanism 16. Moreover, the gas flowing back from the switching regulator 2 side is prevented from being discharged to the outside by the check valve 25. That is, it is possible to reliably prevent both gases from flowing out due to the breakage of the broken portion 13. Then, since the risk of gas leakage can be avoided, the cause of the gas explosion can be eliminated.

Moreover, in the present invention, unlike the gas leak prevention valve 50 described in Patent Document 1, an intermediate rod 57, which is an unstable existence, is not interposed between the valve push rod 55 and the ball-shaped valve 54. Since it is configured, the release prevention mechanism 16 does not malfunction due to the shaking of the earthquake, and the operation between the support rod 21 of the stopper and the ball 23 can be stabilized.
[Embodiment 2]

The configuration of the breakage type gas release preventive device 1 according to the second embodiment of the present invention will be described with reference to FIGS. 1 and 6 to 10. In addition, in FIGS. 6 to 9, the top and bottom in the vertical direction are shown upside down. That is, FIGS. 7 and 9 show a state in which an impact load acts on the switching regulator 2 from the lower left to the upper right in the figure, and at this time, the switching regulator 2 rotates in the clockwise direction in the figure. .. This is shown upside down in order to make it easier to understand the operating state of the breakage type gas release preventive device 1 when an impact load acts on the switching regulator 2.

In the first embodiment, the check valve 25 is configured by using the valve body portion 26, but the check valve 25 of the second embodiment has the same configuration as the release prevention mechanism 16 of the first embodiment. It has a configuration, and is configured by using a support rod 21b and a ball 23b. Other configurations are the same as those in the first embodiment. Therefore, for the same configuration as that of the first embodiment, the same member code as that used in the first embodiment is used, and duplicate description will be omitted.

As shown in FIG. 6, the breakage type gas release preventer 1 has a configuration including a first portion 11 connected to a gas container 3a (not shown) and a second portion 12 connected to the switching regulator 2. .. The first portion 11 and the second portion 12 are connected by a connecting pipe 31, and a gas flow path 17 is formed in the connecting pipe 31. Further, a fragile portion 14 is formed at a portion of the connecting pipe 31 in which the first portion 11 and the second portion 12 are separated from each other, and the first portion 11 and the second portion 12 are separated from each other at the time of breakage. It is configured as a portion 13.

The release prevention mechanism 16 is configured in the connecting pipe 31 on the first site 11 side of the fragile portion 14, and the check valve 25 is configured in the connecting pipe 31 on the second portion 12 side of the fragile portion 14. Has been done.
As shown in FIGS. 6, 8 and 10, the release prevention mechanism 16 includes a support rod 21a, a ball 23a, a compression spring 29a that urges the ball 23a to abut the tip of the support rod 21a, and a compression spring 29a. It is composed of a seat surface 24a that the balls 23a come into contact with and close the gas flow path 17. The seat surface 24a is formed in the connecting pipe 31. The slit fitting portion 22a of the support rod 21a is loosely fitted in the connecting pipe 31, and the outer end portion of the slit fitting portion 22a is not located closer to the second portion 12 than the fragile portion 14. It is arranged in.

The tip of the support rod 21a is arranged at a position where the ball 23a does not come into contact with the seat surface 24a. The outer peripheral diameter of the fitting portion 22a with slits is configured to be an outer peripheral diameter that allows sliding in the connecting pipe 31 without tilting in the connecting pipe 31.
Although the configuration in which the compression spring for urging the ball 23 to the support rod 21 side is not used has been described in the first embodiment, the same spring as the compression spring 29a shown in the second embodiment is also arranged in the first embodiment. It can also be set up.

As shown in FIGS. 6, 8 and 10, the check valve 25 includes a support rod 21b, a ball 23b, and a compression spring 29b that urges the ball 23b to abut the tip of the support rod 21b. It is composed of a valve seat 30b with which the balls 23b abut and close the gas flow path 17. The valve seat 30b is formed in the connecting pipe 31. The slit fitting portion 22b of the support rod 21b is loosely fitted in the connecting pipe 31, and the outer end portion of the slit fitting portion 22b is not located closer to the first portion 11 than the fragile portion 14. It is arranged in.
The outer peripheral diameter of the fitting portion 22b with slits is configured to be an outer peripheral diameter that allows sliding in the connecting pipe 31 without tilting in the connecting pipe 31.

As shown in FIG. 8, the end face of the slit fitting portion 22a of the support rod 21a and the end face of the slit fitting portion 22b of the support rod 21b are arranged so as to be in contact with each other. The end face of the slit fitting portion 22a and the end face of the slit fitting portion 22b are in contact with each other at a position where the spring forces of the compression spring 29a and the compression spring 29b are balanced. The springs of the compression spring 29a and the compression spring 29b are positioned so that the end face of the slit fitting portion 22a and the end face of the slit fitting portion 22b come into contact with each other so that the fragile portion 14 is formed. The forces are configured so that the spring forces are equal to each other.

(Activation of the breakage type gas release preventer at the time of breakage)
As shown in FIG. 7, an impact load acts on the switching regulator 2 that is cantilevered and supported by the gas container 3a (not shown), and the switching regulator 2 rotates in the clockwise direction in the figure to cause a breakage. When 13 is bent, as shown in FIG. 9, the first portion 11 and the second portion 12 are separated at the broken portion 13.

At this time, the support rod 21a of the release prevention mechanism 16 provided on the first portion 11 side slides in the connecting pipe 31 by the urging force from the compression spring 29a via the ball 23a to the outside of the second portion 12 side. It is pushed out toward you. Then, the ball 23a comes into close contact with the seat surface 24a by the urging force from the compression spring 29a, and blocks the gas flow in the gas flow path 17 on the first portion 11 side.
As a result, the gas supplied from the gas container 3a in use is prevented from being released to the outside by the release prevention mechanism 16 provided on the first portion 11 side.

Further, in the check valve 25 provided on the second portion 12 side, the support rod 21b slides in the connecting pipe 31 by the urging force from the compression spring 29b via the ball 23b and is outside the first portion 11 side. It is pushed out toward you. Then, the ball 23b comes into close contact with the valve seat 30b by the urging force from the compression spring 29b, and shuts off the gas flow path 17 on the second portion 12 side.
As a result, the gas flowing back through the flow path 48a of the switching regulator 2 is prevented from being discharged to the outside by the check valve 25 provided on the second portion 12 side.

(effect)
Even if the breakage type gas release preventer 1 is affected by the impact of a falling object due to an earthquake, a flying object due to a strong wind, or a lump of snow, and the broken part 13 is broken, the gas from the gas container 3a used. Is prevented from being released to the outside by the release prevention mechanism 16 provided on the side of the first portion 11. Moreover, the gas flowing out from the switching regulator 2 side is prevented from being released to the outside by the check valve 25 provided on the second portion 12 side. That is, it is possible to reliably prevent the gas from both of them from flowing out due to the breakage of the broken portion 13. Then, since the risk of gas leakage is avoided, the cause of the gas explosion can be eliminated.

1 ... Break type gas release preventer, 2 ... Switching regulator, 3a, 3b ... Gas container, 4 ... Low pressure hose, 5 ... Gas meter, 6 ... High pressure hose, 11. .. 1st part, 12 ... 2nd part, 13 ... broken part, 14 ... fragile part, 16 ... release prevention mechanism, 17 ... gas flow path, 20 ... stopper, 21, 21a, 21b ... Support rod, 23, 23a, 23b ... Ball, 24, 24a ... Seat surface, 25 ... Check valve, 26 ... Valve body, 27 ... Valve rods, 29, 29a, 29b ... compression springs, 30, 30b ... valve seats, 31 ... connecting pipes, 41 ... center rods, 42a, 42b ... nozzles, 43a, 43b ...・ Valve rod, 45 ・ ・ ・ Adjustment spring, 47 ・ ・ ・ Pressure reducing chamber, 48a, 48b, 48c ・ ・ ・ Flow path, 50 ・ ・ ・ Gas leak prevention valve, 52 ・ ・ ・ Thin wall part, 53 ・ ・ ・ Valve Seat, 54 ... ball-shaped valve, 55 ... valve push rod, 57 ... intermediate rod, 60 ... switching adjuster.

Claims (6)

A breakable gas release preventer provided at a connection between a switching regulator for reducing the pressure of high-pressure gas supplied from a gas container and the gas container.
The breakage type gas release preventer is composed of a breakage portion that breaks due to a bending load, a first portion on the gas container side and a second portion on the switching regulator side with the breakage portion as a boundary.
Normally, the first portion allows the supply of gas from the gas container to the switching regulator, and when the broken portion is broken, the gas from the gas container is prevented from being released to the outside. A prevention mechanism is provided to allow the flow of high-pressure gas from the gas container to the switching regulator at the second portion, and when the broken portion is broken, the gas from the switching regulator side is externally provided. A breakable gas release preventer characterized by being provided with a check valve that prevents the gas from being released into the gas. The release prevention mechanism includes a stopper in which one end is supported by the gas flow path on the second portion side and the other end protrudes into the gas flow path on the first portion side with the broken portion as a boundary.
A sheet surface formed on the broken portion side in the gas flow path of the first portion, and
A ball disposed in the gas flow path on the first portion side, which is in contact with the other end of the stopper and is separated from the seat surface, is provided.
One end of the stopper is supported in the gas flow path of the second portion in a state where the gas flow in the gas flow path of the first portion is allowed.
Claim 1 is characterized in that when the broken portion is broken, the other end of the stopper is disengaged from the contact with the ball, and the ball is pressed against the seat surface by the gas pressure from the gas container. The breakable gas release preventer described in. The breakable gas release preventer according to claim 1 or 2, wherein a fragile portion is formed around the broken portion in the breakable gas release preventer. The breakable gas release preventive device according to claim 3, wherein the sheet surface is formed at a position distant from the formation position of the fragile portion toward the gas container side. The breakable gas release preventive device according to any one of claims 2 to 3, wherein the portion of the stopper on the side that comes into contact with the ball is made of a flexible member. A connecting pipe for connecting the first part and the second part is provided, and a ball and a ball are provided in the connecting pipe on the first part side and the second part side with the broken part formed in the connecting pipe as a boundary. , A support rod that comes into contact with the ball and a compression spring that urges each ball to the support rod side are arranged.
The seat surface having a valve function is formed in the connecting pipe on the first member side by the contact of the balls, and the seat surface having the valve function is formed in the connecting pipe on the second member side by the contact of the balls. The breakage type gas release preventive device according to claim 1, wherein the release prevention mechanism and the check valve are formed.

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