JPH09144941A - Emergency self actuated cut off valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the simple structure inexpensively, and eliminate the trouble for maintenance. SOLUTION: A turning lever 3 is fixed to a valve shaft 2a of a valve body 2, which is provided in a flow passage 1a inside of a valve box 1 freely to be opened and closed, and a weight 4 for energizing the valve body 2 in the closing direction A is fitted to the turning lever 3, and a lock pin 11 is engaged with the turning lever 3 through links 5a-5c freely to be disengaged, and a ball 24 is placed on a receiver 23, and while a ball receiver member 31 facing to the receiver 23 is connected to a rear end of the lock pin 11 through a connecting rod 27. The ball 24, which is fallen from the receiver 23 by the vibration of the receiver 23, is received by the ball receiver member 31, and the lock pin 11 is retreated by the weight of the ball 24 so as to be disengaged from the turning lever 3.

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 This type of self-powered emergency shutoff valve is provided, for example, at the entrance / exit of a water supply reservoir, and when a midway point of piping extending from the entrance / exit is broken due to an earthquake or the like, the It is possible to secure the drinking water by detecting and blocking the entrance and exit by itself.

A conventional example of the self-powered emergency shutoff valve 1 is shown in FIG. This is because a turning lever 3 is fixed to one end of a valve shaft 2a of a valve body 2 that is openably and closably provided in a flow path 1a in a valve box 1 that is concentrically interposed in a pipe.
A weight 4 for urging the valve body 2 in the closing direction A is attached to the rotation lever 3, and the lock mechanism 5 locks the valve body 2 in an open state by engaging the rotation lever 3 in a disengageable manner. The lock mechanism 5 has three links 5a, 5b, 5c that are rotatably pin-connected to each other, and the base end side link 5a thereof has a side plate 7 fixed to the valve box 1.
Is rotatably connected to the lever via a support shaft 8, and a recess 9 formed at the tip of the tip side link 5c is detachably engaged with a lever pin 3a protruding from the turning lever 3 to form a tip side link. A spring 10 for urging the tip side link 5c in a direction separating from the lever pin 3a is stretched between the side plate 5c and the side plate 7, and a lock pin for supporting the bottom surface of the tip side link 5c against the spring 10. Solenoid 12 in which 11 is movably inserted into the through hole of the side plate 7 to move the lock pin 11 back and forth.
Are arranged in the housing 13 attached to the side plate 7. In addition, 14 is a buffer damper connected to one end of the valve shaft 2a, and 15 is a manual handle for valve element opening / closing operation connected to the other end of the valve shaft 2a via a clutch mechanism 16.

In the above structure, when an earthquake occurs, the solenoid 12 is operated by the controller based on the detection signal from the seismograph which detects the earthquake, and the lock pin 11 is retracted. As a result, the tip-side link 5c is moved to the spring 10
Is pulled down, the recess 9 of the tip side link 5c is separated from the lever pin 3a, and the lock is released. When the lock is released, the turning lever 3 is turned 90 ° in the direction of arrow A by the weight of the weight 4, the valve body 2 is turned 90 ° in the same direction via the valve shaft 2a, and the flow in the valve box 1 is increased. The path 1a is closed.

[0005]

SUMMARY OF THE INVENTION In the above conventional configuration,
In addition to the solenoid 12, a seismograph, control device, battery, etc. are required to move the lock pin 11 in and out,
The structure is complicated and expensive, and maintenance is troublesome.

In view of the above problems, it is an object of the present invention to provide a self-powered emergency shutoff valve which has a simple structure and is inexpensive, and which requires less maintenance.

[0007]

To achieve the above object, according to the present invention, a turning lever is fixed to a valve shaft of a valve body which is openably and closably provided in a flow path in a valve box, and A weight for biasing the valve body in the closing direction is attached to the lever, and the weight is releasably engaged with the turning lever,
A lock pin is provided to lock the valve element in an open state, the ball is supported by a pedestal arranged near the lock pin, and a ball receiving member facing the pedestal is connected to the lock pin. The ball dropped from the pedestal by the vibration of the pedestal is received by the ball receiving member, and the lock pin is disengaged from the rotating lever by the weight of the ball.

In the above structure, in the normal state, the lock pin is engaged with the rotating lever to lock the valve element in the open state. In this state, when the pedestal vibrates due to the occurrence of an earthquake, The ball falls from the pedestal and is received by the ball receiving member, the lock pin is disengaged from the rotating lever due to the weight of the ball, and the valve body rotates in the closing direction by itself to block the flow path. .

In this case, when an earthquake occurs, it is immediately detected, the lock is released, and the valve body closes the flow path in the valve box. The lock release mechanism is mechanically constructed. Therefore, the lock can be released even in the event of a power failure, the structure is simple and inexpensive, and maintenance is easy.

[0010]

1 to 3 show a self-powered emergency shutoff valve according to an embodiment of the present invention, in which a lock pin 11 in a housing 13 is unlocked for unlocking. A mechanism 20 is provided. In the configuration other than the above, the same parts as those in the conventional example shown in FIG.

The lock release mechanism 20 includes a housing 1
3, a box body 21 fixed to the rear of the upper part, a pedestal 23 arranged in a suspended manner via a support rod 22 in the box body 21, and a concave spherical recess 23a formed on the upper surface of the pedestal 23. The ball 24 mounted on the box, the ball guide cylinder 25 vertically hung on the bottom wall of the box body 21, the rear end of the lock pin 11 and the box body 21 so that the lock pin 11 is moved forward. The spring 26 for urging and the long hole 27a formed at the upper end are the lock pin 11
It is fitted to the connecting pin 28 protruding from the rear end of the
A connecting rod 27 whose lower end is rotatably supported by a bearing 30 via a pivot 29, and a gutter-shaped ball extending slightly downward from the lower end of the connecting rod 27 to just below the ball guide cylinder 25. It has a receiving member 31.

In the above structure, in the normal state, as shown by the solid line in FIGS. 2 and 3, the lock pin 11 supports the bottom surface of the tip side link 5c to lock the valve body 2 in the open state, In this state, when the pedestal 23 vibrates due to the occurrence of the earthquake, the balls 24 drop from the pedestal 23, pass through the ball guide cylinder 25 and are received by the ball receiving member 31, and the weight of the ball 24 causes the balls to fall. Receiving member 31
The connecting rod 27 is rotated downward about the pivot 29 (see phantom line in FIG. 3), the lock pin 11 is retracted against the spring 26, and the tip side link 5 by the lock pin 11 is moved.
The supporting state of c is canceled, and the tip side link 5c is replaced by the spring 1.
It is pulled down by 0, the recess 9 of the tip side link 5c is separated from the lever pin 3a, and the lock is released (see phantom line in FIG. 2). When the lock is released, the turning lever 3 is turned 90 ° in the direction of arrow A by the weight of the weight 4 (state shown in phantom in FIG. 2), and the valve body 2 is turned 90 ° in the same direction via the valve shaft 2a. The flow path 1a in the valve box 1 is closed.

In the above structure, the lock pin 11 is connected to the link 5
Although the rotation lever 3 is engaged with the rotation lever 3 via a to 5c, the lock pin 11 is directly engaged with the rotation lever 3 to thereby make the valve body 2
May be locked in an open state. According to this, the structure can be simplified by omitting the links 5a to 5c, and the manufacturing cost can be reduced.

[0014]

According to the present invention, since the valve body unlocking mechanism is mechanically constructed, the lock can be released even during a power failure, and the structure is simple and inexpensive.
No maintenance required.

[Brief description of the 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 side view of the main part.

FIG. 3 is a front view of the main part.

FIG. 4 is a perspective view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 valve box 1a flow path 2 valve body 2a valve shaft 3 turning lever 4 weight 11 lock pin 23 pedestal 24 ball 27 connecting rod 31 ball receiving member

Claims (1)

[Claims] 1. A turning lever is fixed to a valve shaft of a valve body that is openably and closably provided in a flow path in a valve box, and a weight for urging the valve body in a closing direction is attached to the turning lever. And by releasably engaging the rotating lever,
A lock pin is provided to lock the valve element in an open state, the ball is supported by a pedestal arranged near the lock pin, and a ball receiving member facing the pedestal is connected to the lock pin. The ball is dropped from the pedestal by the vibration of the pedestal and is received by the ball receiving member, and the lock pin is disengaged from the rotating lever by the weight of the ball. Emergency shutoff valve.