JPH0932945A - Self-powered emergency shut-off valve - Google Patents

Abstract

(57) [Abstract] [Problem] To detect the occurrence of an earthquake disaster and shut off the flow path by itself. A valve body (6) arranged to be openable and closable in a flow path (5a) in a valve box (5) is biased in a closing direction, and a key (26) interlocking with the valve body (6) via an interlocking mechanism (10) is provided. , The valve body 6 by detachably engaging with the key 26.
Is provided with a lock member 27 for locking the ball in an open state, and a ball 39 is provided on a pedestal 38 arranged near the lock member 27.
Is supported, and a ball receiving member 41 is provided on the lock member 27 so as to face the receiving table 38, and the balls 3 dropped from the receiving table 38 due to the vibration of the receiving table 38.
9 is received by the ball receiving member 41, and the ball 3
The lock member 27 is detached from the key 26 by the weight of 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a self-powered emergency shutoff valve capable of detecting the occurrence of an earthquake disaster and shutting off a flow path by itself.

[0002]

2. Description of the Related Art As shown in FIG. 4, a self-powered emergency shutoff valve 1 of this type is provided, for example, at the entrance / exit of a water supply reservoir 2 and an intermediate point a of a pipe 3 extending from the entrance / exit is affected by an earthquake. In the case of breakage due to occurrence or the like, it is possible to detect it and shut off the entrance and exit by itself to secure drinking water.

A conventional example of the self-powered emergency shutoff valve 1 is shown in FIG. This is because the valve body 6 such as a butterfly valve that is openably and closably arranged in the flow path 5a in the valve box 5 that is concentrically interposed in the pipe 3 is biased in the closing direction,
A paddle 9 is rotatably supported along the fluid flow direction A through a pivot shaft 8 in a closed cylindrical body 7 integrally projecting on the upper part of the paddle 9 and a pressure receiving member provided at the lower end of the paddle 9 is supported. The portion 9a is projected into the valve box 5 to lock the valve body 6 between the paddle 9 and the valve body 6 in an open state, and in conjunction with the paddle 9 being rotated downstream. An interlocking mechanism 10 with a lock releasing function for releasing the lock is provided.

In the above structure, as described above, when the intermediate portion a of the pipe 3 is broken and the fluid velocity in the valve box 5 is abnormally increased and the pressure receiving portion 9a is pressed, as shown in FIG. As shown by the phantom line, the paddle 9 is rotated to the downstream side, the lock of the valve body 6 is unlocked by the lock release function of the interlocking mechanism 10, and the valve body 6 rotates by itself in the closing direction to cause the flow path. 5a is cut off.

[0005]

SUMMARY OF THE INVENTION In the above conventional configuration,
As shown in FIG. 4, when the end portion b of the pipe 3 is broken due to the earthquake, the end portion b is far away from the self-powered emergency shutoff valve 1, so that the fluid velocity in the valve box 5 is almost changed. In some cases, the flow path 5a could not be blocked.

In view of the above problems, it is an object of the present invention to provide a self-powered emergency shutoff valve which can detect the occurrence of an earthquake and shut off the flow path by itself.

[0007]

In order to achieve the above object, the present invention relates to a valve body, which is openably and closably arranged in a flow path in a valve box, urged in a closing direction and interlocked with the valve body. A key that is interlocked via a mechanism is provided, and a lock member that locks the valve element in an open state by being releasably engaged with the key is provided, and a pedestal disposed near the lock member is provided. The ball is supported, and a ball receiving member is provided on the lock member so as to face the pedestal, and a ball dropped from the pedestal due to vibration of the pedestal is received by the ball receiving member. It is characterized in that the lock member is detached from the key depending on the weight of the ball.

In the above structure, the case where the self-powered emergency shutoff valve of the present invention is provided at the outlet of a water supply reservoir will be described as an example. In a normal state, a key that is interlocked with a valve body via an interlocking mechanism is used. When the pedestal vibrates due to the occurrence of an earthquake in this state by engaging with the lock member and locking the valve element in the open state, the ball falls from the pedestal and is provided on the lock member. The ball is received by the ball receiving member, the weight of the ball releases the lock member from the key, and the valve body rotates by itself in the closing direction to block the flow path.

In this case, even when the terminal portion of the pipe is broken by the earthquake and the fluid velocity in the flow path of the valve box hardly changes, the occurrence of the earthquake can be detected and the flow path can be shut off by itself. .

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a self-powered emergency shutoff valve 1 according to an embodiment of the present invention, which is an interlocking mechanism with a lock release function provided between a valve body 6 and a paddle 9. 10
The vibration detection mechanism 11 is provided in the.

The interlocking mechanism 10 with the unlocking function is
A weight 14 provided on one end side of the valve shaft 13 for urging the valve body 6 in the closing direction, and a lever 1 fixed to the other end side of the valve shaft 13.
5, a fluid pressure cylinder 16 such as a hydraulic cylinder connected to one end of the lever 15, a toggle mechanism 17 connected to the other end of the lever 15, and a toggle mechanism 17
And a lock mechanism 18 provided between the pivot shaft 8 that pivotally supports the paddle 9.

One end of the toggle mechanism 17 is rotatably connected to each other through a connecting pin 20, and both ends of the toggle mechanism 17 are pivotally supported by the other end of the lever 15 and the fixed shaft 21, respectively. 17a and 17b, and the link 17
A tip end of a crank arm 23 extending from a crankshaft 22 rotatably arranged below a and 17b in a direction orthogonal to the fluid flow direction A is rotatably connected to the connecting pin 20, and A weight 24 for urging the crankshaft 22 in the counterclockwise direction B is attached to one end.

As shown in FIGS. 2 and 3, the lock mechanism 18 has a key 26 projecting from the other end of the crankshaft 22 and a lock member 27 releasably engaged with the key 26. The lock member 27 includes a pivotal support cylinder portion 27a pivotally supported by a fixed shaft 28, and a substantially L-shaped lock piece that is hung on the pivotal support cylinder portion 27a and engages with the key 26. 27b
And a latch lever 27c extending upstream from the pivot cylinder portion 27a along the fluid flow direction A, and the tip of the latch lever 27c is hung from a lever rod 29 fixed to the pivot shaft 8. A spring 31 and a nut 3 are attached to the lower end of the connecting rod 30.
2, a weight 33 for urging the lock piece 27b in the direction of engaging the key 26 is movably disposed on one end side of the lever rod 29, and the other end side of the lever rod 29 is also movable. A balance weight 34 is attached to the.

In the above structure, the case where the self-powered emergency shutoff valve 1 is provided at the entrance and exit of the water supply reservoir 2 for water supply will be described as an example (see FIG. 4). When the fluid velocity in the valve box 5 is abnormally increased and the pressure receiving portion 9a is pressed, the lever rod 29 and the connecting rod 29 are rotated by rotating the paddle 9 to the downstream side, as shown by an imaginary line in FIG. The lock member 27 is rotated in the clockwise direction C via 30 and the lock piece 27b is disengaged from the key 26 and the lock is released. As a result, the crankshaft 22 is rotated in the counterclockwise direction B by the weight of the weight 24, the connecting pin 20 is pulled up via the crank arm 23, and the links 17a and 17b of the toggle mechanism 17 are centered on the connecting pin 20. Is bent upward, the other end of the lever 15 is pulled, and the valve 6
Rotates by its own weight in the closing direction by the weight of the weight 14 and shuts off the flow path 5a in the valve box 5 (see the phantom line in FIG. 5). The valve body 6
The fluid pressure cylinder 16 damps the impact of a water hammer or the like that occurs when the is rotated in the closing direction.

When the valve body 6 is to be opened again, the fluid pressure cylinder 16 may be reduced. As a result, the valve body 6 is rotated in the opening direction via the lever 15 and the valve shaft 13, and the key 26 is rotated in the clockwise direction to engage the lock piece 27b to lock the valve body 6 in the open state. It is possible (see FIG. 1).

As shown in FIGS. 2 and 3, the vibration detecting mechanism 11 has an opening / closing lid 3 arranged above the lock member 27.
6a, a sealed box 36, a pedestal 38 that is suspended in the sealed box 36 via a support rod 37, and a ball mounted on a concave spherical recess 38a formed on the upper surface of the pedestal 38. 39, a ball guide cylinder 40 hung vertically on the bottom wall of the hermetically sealed box 36, and a gutter shape that extends slightly downward from the pivot cylinder 27a of the lock member 27 just below the ball guide cylinder 40. Ball receiving member 41.

In the above structure, when the pedestal 38 vibrates due to the occurrence of the earthquake, the balls 39 drop from the pedestal 38, and the dropped balls 39 are contained in the pedestal 38 and the sealed box 36.
It passes through the space 42 between the inside and the inside of the ball guide cylinder 40, is received by the ball receiving member 41, and moves to the tip side of the ball receiving member 41. As a result, the lock member 27 is rotated in the clockwise direction C by the weight of the ball 39 as shown by the phantom line in FIG.
6 is released and the lock is released. After that, the valve body 6 is rotated in the closing direction by itself in the same procedure as described above to shut off the flow path 5a in the valve box 5 (see the phantom line in FIG. 5).

According to the above construction, when the intermediate portion a of the pipe 3 is broken and the fluid velocity in the flow passage 5a rises abnormally, it is detected by the pressure receiving portion 9a of the paddle 9, and
When the end portion b of the pipe 3 is broken due to the earthquake and the fluid velocity in the flow passage 5a hardly changes, the vibration detection mechanism 11 detects it and unlocks it, and the valve body 6 releases the flow passage 5a. Can be shut off by itself.

[0019]

According to the present invention, even when the terminal portion of the pipe is broken due to the earthquake and the fluid velocity in the flow path of the valve box hardly changes, the occurrence of the earthquake is detected and the flow path is self-generated. Can be shut off.

Further, since it operates mechanically, the flow path can be surely shut off even if a power failure occurs due to an earthquake.

[Brief description of drawings]

FIG. 1 is a perspective view of a self-powered emergency shutoff valve according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of the main part.

FIG. 3 is a cross-sectional view of the main part.

FIG. 4 is a schematic view showing a state in which the self-powered emergency shutoff valve is provided at the entrance and exit of a reservoir.

FIG. 5 is a vertical sectional view showing a conventional example.

[Explanation of symbols]

 5 valve box 5a flow path 6 valve body 26 key 27 lock member 38 pedestal 39 ball 41 ball receiving member

Claims (1)

[Claims] 1. A valve body that is openably and closably arranged in a flow path in a valve box is biased in a closing direction, and a key that interlocks with the valve body via an interlocking mechanism is provided. A lock member that locks the valve element in an open state by being removably engaged is provided, the ball is supported by a pedestal arranged near the lock member, and the ball is supported facing the pedestal. A ball receiving member is provided on the lock member, and a ball dropped from the pedestal by the vibration of the pedestal is received by the ball receiving member, and the lock member is disengaged from the key due to the weight of the ball. Self-powered emergency shutoff valve characterized by being configured.