JPS6123980Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement in an emergency shutoff valve device that automatically shuts off a pipeline immediately in the event of an earthquake of a predetermined seismic intensity or higher, or in the event of an abnormality such as a pipeline rupture.

As is known from several earthquake disasters that have occurred in the past, when an earthquake occurs, water supply facilities, especially pipes, may rupture or their connections may become detached, leading to water leakage and resulting water outages, as well as secondary disasters caused by man-made disasters. Floods occur frequently.

Conventionally, in order to prevent these situations, abnormal situations such as seismic intensity exceeding a predetermined seismic intensity or pipe rupture are automatically detected using a predetermined detection device (seismic intensity meter, orifice, etc.), and the detection signal is used to trigger the valve body. Various structures are known as emergency shutoff valve devices that automatically open to shut off a pipeline. However, all conventional devices of this type have the following drawbacks.

In the case of seismic intensity sensing methods that detect seismic intensity greater than a predetermined seismic intensity, even if a pipeline ruptures due to a factor other than an earthquake, the valve body will not close unless an earthquake greater than the predetermined seismic intensity is detected, and the pipe will close. Road blocks cannot be performed. In addition, with the flow velocity sensing method that detects when the flow velocity in the pipe exceeds a predetermined value, an earthquake of a predetermined seismic intensity or higher occurs, creating a dangerous situation and making it desirable to shut down the pipe. However, unless the flow velocity in the pipe exceeds a predetermined value due to a pipe rupture or the like, the valve body will not close and the pipe cannot be shut off.

The present invention was developed in view of the above circumstances, and is effective in both cases when an earthquake of a predetermined seismic intensity or higher occurs, or when the amount of change in flow velocity in a water pipe exceeds a predetermined value due to a pipe rupture, etc. It is an object of the present invention to provide an emergency shutoff valve device that can automatically detect and automatically close a valve body based on the detection signal to automatically shut off a pipeline.

An embodiment of the present invention will be described below based on the drawings. FIG. 1 is a front view showing the overall configuration of the emergency shutoff valve device of the present invention, and FIG. 2 is a view taken along the - line in FIG. 1.

The device of the present invention includes a valve device 1, a locking device 41, first and second unlocking devices 12, 23, and a first locking device 1.
and second detection devices 11 and 22.

A valve device 1 includes a valve body 3 within a valve casing 2 and a valve shaft 4.
It has a so-called butterfly valve structure in which it is rotatable in the forward and reverse directions within a predetermined angular range around the center. A return device 5 is provided at one end of the valve shaft 4, and an energizing device 50 is provided at the other end.
are provided for each. The return device 5 is for rotating and returning the valve body 3 from the closed position to the open position.
The return operation is performed by rotating the handle 6. The energizing device 50 is used to rotationally energize the valve body 3 in the valve closing direction (counterclockwise in FIG. 2) using the potential energy of the weight 51. The weight 51 is attached to the other end of a weight lever 49 whose one end is fixed to the valve shaft 4.

The locking device 41 locks and holds the valve body 3 in a fully open state against the biasing force of the biasing device 50, and is attached to the mounting plate 7 on the outer surface of the valve casing 2.
The locking device 41 includes first locking devices that are removably engaged with each other.
It consists of a multistage lever mechanism having sixth levers 42 to 47. A locking arm 48 is detachably engaged with the first lever 42, and the locking arm 48 is fixed to the other end of the valve shaft 4. 6th
The lever 47 is connected to the first and second lock release devices 1.
It is connected to 2 and 23.

The first lock release device 12 releases the lock state of the lock device 41 when an earthquake of a predetermined seismic intensity or greater occurs. The second lock release device 23 releases the lock state of the lock device 41 when the change in the flow velocity in the pipeline exceeds a predetermined set value due to a pipeline rupture or the like.

The first lock release device 12 is an electromagnetic solenoid 1
3, the outer end of the plunger 14 is the first
It is connected to the sixth lever 47 via a link piece 15 . The first link piece 15 has an elongated hole 16 and one end thereof is rotatably connected to the plunger 14 by a pin 17. A pin 18 protruding from one side of the sixth lever 47 is loosely fitted into the elongated hole 16 of the first link piece 15 .

The second unlocking device 23 is a differential pressure cylinder 31
Both ends of the piston rod 32 extend outward from the differential pressure cylinder 31. One end (lower end) of the piston rod 32 is connected to a sixth lever 47 via a second link piece 33. The second link piece 33 has the same structure as the first link piece 15 and has a long hole 34, and one end thereof is rotatably connected to the lower end of the piston rod 32 of the differential pressure cylinder 31 by a pin 35. A pin 18 protruding from the other side of the sixth lever 47 is loosely fitted into the elongated hole 34 of the second link piece 33 .

In addition, the operation of the electromagnetic solenoid 13 and the differential pressure cylinder 31 is enabled to operate independently without being restricted by each other due to the action of the elongated holes 16 and 34 provided in both of the link pieces 15 and 33. .

The first detection device 11 detects seismic intensity, has a seismometer, and is electrically connected to the electromagnetic solenoid 13 of the first lock release device 12.

When an earthquake of a predetermined seismic intensity or higher occurs, the first detection device 11 transmits a detection signal, and in response to the signal, the electromagnetic solenoid 13 is energized and the plunger 14 moves in one direction (upward). The lock is released.

The second detection device 22 is the upstream pipe line 2 of the valve device 1.
1 has an orifice 24 interposed therein to detect the flow velocity in the pipe 21. The pressure take-off pipes 25 and 26 above and downstream of the orifice 24 are connected to the second lock release device 23.
Upper and lower connection ports 29, 29' of differential pressure cylinder 31
It is connected to. When the differential pressure above and downstream of the orifice 24 exceeds a predetermined set value, the piston rod 32 of the differential pressure cylinder 31 moves in one direction (upward) and is unlocked.

In addition, the pressure outlet pipes 25 and 26 are equipped with an adjustment valve 2.
7 and 28 are interposed. Further, an adjustment weight 30 is provided at the upper end of the piston rod 32 of the differential pressure cylinder 31 of the second lock release device 23, and by adjusting this weight 30, the differential pressure value between the upper and downstream of the orifice at which the lock is released can be adjusted. can.

A braking device 52 is connected to the weight lever 49, and the opening speed of the valve body 3 can be freely adjusted.

Also, a limit switch 56 is attached to the mounting plate 7, which is struck by the locking arm 48 when the valve body 3 is in the fully closed position.
is connected to an alarm device.

Next, the operation of the device of the present invention will be explained. In the set state, the valve body is locked and held in the fully open position by the locking device against the urging force of the weight. Also, the orifice 2 that should shut off the valve body 3
4. Set the upstream/downstream differential pressure and the seismic intensity to predetermined values, and fully open each of the adjustment valves 27, 28, 27', and 28' provided in the pressure take-off pipes 25, 26. Keep the valves 27'' and 28'' fully closed.

In such a set state, for example, if an earthquake of a magnitude greater than a predetermined value occurs, the electromagnetic solenoid 13 is energized and excited by the detection signal transmitted from the seismograph, and the plunger 14 moves upward. This plunger 14 has a pin 17 and a first
A sixth lever 47 connected sequentially through the link piece 15 and the pin 18 rotates counterclockwise in FIG.
are disengaged, each lever is accordingly disengaged, and the first lever 42 and the locking arm 48 are disengaged. As a result, the locked state is released, and the valve body 3 is rotated to the closed position by the potential energy of the weight 51, thereby blocking the pipe line 21.

On the other hand, in the above set state, if a pipe rupture occurs and the differential pressure above and downstream of the orifice exceeds the set value, that is, if the downstream pressure decreases, the piston rod 32 of the differential pressure cylinder 31 will move upward due to the upstream pressure. In order to move, pin 3 is attached to this piston rod 32.
5. The sixth lever 47 connected sequentially through the second link piece 33 and the pin 18 rotates counterclockwise in FIG. 3 closes and blocks the pipe line 21.

As described above, the present invention includes a valve device interposed in a pipe, a biasing device that biases the valve body of the valve device to rotate in the valve opening direction, and a biasing device that rotates and biases the valve body of the valve device in the valve opening direction. a lock device that locks the valve body in an open state; a first detection device that sends a detection signal when an earthquake of a predetermined seismic intensity or higher occurs; and a first detection device that sends a detection signal when the flow velocity in the pipe exceeds a predetermined set value. a second detection device that transmits a signal;
and a lock release device that releases the locked state of the lock device in response to the transmission of a detection signal from at least one of the first and second detection devices, so that when an earthquake of a predetermined seismic intensity or higher occurs and the In any situation when the flow velocity in the pipe is abnormal due to a path rupture, etc., the valve body can close based on the detection signal and the pipe can be cut off. Therefore, this type of shutoff valve device is extremely effective.

[Brief explanation of the drawing]

FIG. 1 is a front view showing the overall configuration of an emergency shutoff valve device according to the present invention, FIG. 2 is a view taken along the line - - in FIG. 1, and FIGS. 3 and 4 are enlarged views of essential parts of the present invention. 3... Valve body, 4... Valve stem, 11... First detection device, 12... First lock release device, 13...
Electromagnetic solenoid, 14... Plunger, 15...
First link piece, 16, 34... Long hole, 18...
Pin, 22... second detection device, 23... second lock release device, 31... differential pressure cylinder, 32...
...Piston rod, 33...Second link piece, 4
1...Lock device.

Claims (1)

[Scope of utility model registration request] A valve device interposed in a conduit, a biasing device that rotates and biases the valve body of the valve device in the valve opening direction, and the valve body is brought into the open state against the biasing force of the biasing device. A locking device that maintains the lock, a first detection device that sends out a detection signal when an earthquake of a predetermined seismic intensity or higher occurs, and a second detection device that sends out a detection signal when the flow velocity in the pipe exceeds a predetermined set value. and an electromagnetic solenoid operated by the first detection device and a differential pressure cylinder operated by the second detection device are arranged in series, and a detection signal is transmitted from at least one of the first and second detection devices. The emergency cutoff is characterized in that the lock release device is provided with first and second lock release devices for releasing the locked state of the lock device, and both lock release devices are capable of independent operation by means of link pieces. Valve device.