JP2002071039A - Emergency shutdown valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an emergency shutdown valve having simple construction in which valve opening state is immediately switched to a valve closing state so as to securely and safely intercept a conduit in case of emergencies such as earthquake. SOLUTION: The emergency shutdown valve 1 is primarily comprises a valve body 2 in which a valve element 4 is mounted on a valve rod 5 inserted into a valve casing 3 to be disposed, an arm 7 communicated with the valve rod 5 and provided with a weight 6 energized in a closing direction of the valve element 4, a lock lever 8 locking the arm 7 at a valve opening position of the valve element 4, a motor-driven actuator 14 canceling the locking status, and a hydraulic shock absorber 25 for controlling rotating speed of the arm 7. With this configuration, energization to the motor-driven actuator 14 for a very short time leads to a lock releasing operation and allows rotation of the arm 7. The abnormalities such as a break exert little effect on valve opening action of the valve element 4, thereby preventing a stop of the valve element 4 at an intermediate opening degree, and allowing the conduit to securely and safely intercept.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an emergency shut-off valve which is installed in a pipe of a water supply or the like and automatically shuts off a pipeline when an emergency such as a large earthquake occurs.

[0002]

2. Description of the Related Art In the event of an emergency such as damage to a pipeline caused by a large earthquake, a landslide, or a deteriorated pipeline, the pipeline is automatically shut down promptly to secure valuable water resources, and to prevent the occurrence of runoff. In order to prevent secondary disasters caused by the disaster, emergency shut-off valves are installed in pipes for water supply and other facilities. FIG. 6 shows a known emergency shutoff valve.

In the emergency shutoff valve 31 shown in FIG. 6, water pipes are respectively connected to openings at both ends of a valve box 33 of a valve body 32. When the valve body 34 shown in FIG. Water flows through the water supply pipe.

[0004] A valve stem 35 is provided to pass through the inside of the valve box 33, and the valve element 34 is attached to the valve stem 35. An arm 37 equipped with a weight 36 at the tip is rotatably attached to one end of the valve stem 35 so as to rotate the valve stem 35 in an emergency and bring the valve body 34 into a closed state in an emergency. I have. The shaft to which the arm 37 is attached is connected to an output shaft of an electromagnetic brake 39 for controlling the rotation of the arm 37 via an on-axis speed reducer 38. A hydraulic shock absorber 41 for controlling the rotation speed, that is, the valve closing speed of the valve body 34, at a slow speed is connected to the locking piece 40 provided on the arm 37.

The other end of the valve stem 35 is connected to a clutch 42 coaxially therewith.
Is turned on and off by the manual opening / closing device 44 of the valve element 34. The clutch 42 can also be turned on and off by a motorized opening / closing device 45 attached thereto. The valve body 34 is
Normally, the electromagnetic brake 39 locks the valve in an open state.

[0006] For example, in Japanese Patent Application Laid-Open No. Hei 9-242918, similarly to the case shown in FIG. Arm having a weight attached thereto, a rotating plate which rotates via a link mechanism in accordance with the rotation of the arm, a locking device having a locking lever for locking the rotating plate, and pulling up the locking lever A shut-off mechanism including a solenoid for releasing a locked state is shown. The solenoid is controlled by an electric circuit that incorporates a vibration sensation device that senses shaking during an earthquake and closes the circuit.

[0007]

In the emergency shut-off valve shown in FIG. 6, a horizontal vibration due to an earthquake is detected by a seismograph.
When the seismic intensity exceeds the set value, an emergency cutoff signal is issued to the control device of the electromagnetic brake. Similarly, an orifice is installed in a pipeline requiring abnormality detection, and a differential pressure before and after the orifice is detected. When the differential pressure exceeds a set value, an emergency signal is issued to a control device of the electromagnetic brake. When the lock by the electromagnetic brake is released by these signals, the arm rotates by its own weight of the weight attached to the distal end, and the valve body is closed.

However, when the valve body is rapidly closed to shut off the pipe, a water hammer action (water hammer) occurs in which the pressure in the pipe sharply increases and vibration occurs, and this water hammer action is prevented. Therefore, the valve body closes while the rotation speed of the arm is controlled slowly by the hydraulic shock absorber, so that the electromagnetic brake is released by the emergency cutoff signal and the valve body is completely closed. Therefore, it is necessary to energize the arm during rotation of the arm to maintain the release of the electromagnetic brake. If an abnormality such as a disconnection occurs in the control system of the electromagnetic brake during this time, the electromagnetic brake is locked again and the valve body stops at the intermediate opening degree,
The valve cannot be closed and the water in the pipeline cannot be completely shut off.

In the method disclosed in Japanese Patent Application Laid-Open No. 9-242918, the operating stroke of the solenoid is short,
In addition, since the operating force is weak, it is necessary to use the above-mentioned auxiliary mechanism such as the link mechanism or the rotating plate to release the locked state and rotate the arm to close the valve body. Becomes complicated.

SUMMARY OF THE INVENTION An object of the present invention is to provide a simple emergency shut-off system which automatically and automatically switches from a valve-open state to a valve-closed state in the event of an emergency such as a large earthquake to reliably and safely shut off a pipeline. Is to provide a valve.

[0011]

In order to solve the above-mentioned problems, the present invention employs the following configuration.

That is, a valve body having a valve body rotatably mounted inside a valve box, an arm rotating in conjunction with a valve rod of the valve body, and closing the valve body mounted on this arm. A weight that urges the arm in a direction, a lock unit that locks the arm at a valve opening position of the valve body, and a lock release unit that releases the lock in order to rotate the arm in a valve closing direction of the valve body. An emergency shut-off valve having a shock absorber for controlling the rotation speed of the arm, wherein the lock means is a rock lever pivotally supported and the arm is disengaged from the lock lever. And an electric actuator is used as the unlocking means.

With this configuration, it is possible to release the locked state by swinging the lock lever, which is locked to the arm, around the support pin by simply energizing and operating the electric actuator for a very short time. Is released, the arm is rotated by the weight of the weight, the valve body is closed, and the pipe is cut off. As described above, in order to prevent the water hammer action, the valve body closes while the rotation speed of the arm is controlled slowly by the hydraulic shock absorber, so that the valve body is completely closed and the pipe is closed. It takes some time to cut off the road. During this time, there is no need to continue energizing the electric actuator, and it is only necessary to energize for a very short time at the time of the first lock release. Therefore, the occurrence of an abnormality such as a disconnection or the like rarely affects the valve closing operation of the valve body. Therefore, the valve body is prevented from stopping at the intermediate opening degree, and the pipeline can be reliably and safely shut off. Further, since an auxiliary mechanism for rotating the arm as described above is not required, the structure is simplified.

A concave portion is formed on a lower surface on one end side of the lock lever, the concave portion being engaged with a locking portion of the arm to lock the lock lever to the arm, and the other end of the lock lever connects the concave portion with the concave portion. It can be connected to the electric actuator via a spring for pressing against the locking portion.

By forming such a concave portion, the lock lever is locked to the arm, and the arm can be reliably locked at the valve opening position of the valve body.

In a state where the spring is compressed,
Since the lock lever can be locked to the arm, the concave portion of the lock lever can be pressed against the locking portion around the support pin by the reaction force of the spring, and the locked state can be more firm. Become.

Further, when the arm is rotated from the valve-closed state to return the valve body to the fully open position, the flexibility of the spring causes the locking portion to have one end formed on the side of the lock lever where the concave portion is formed. And lifts it up around its support pin in contact with it, and this recess can be easily locked to the locking portion.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

FIGS. 1 to 4 show an emergency shut-off valve 1 according to an embodiment of the present invention. As in the conventional case, a water pipe 3 is provided at both ends of a valve box 3 of a valve body 2.
0a, 30b are connected, and the valve element 4 shown in FIGS.
When the valve is open, water flows through the water supply pipe.

As shown in FIGS. 1 to 3, a valve body 4 is rotatably mounted inside the valve box 3, and one end of a valve rod 5 to which the valve body 4 is mounted is connected to an emergency in conjunction therewith. An arm 7 equipped with a weight 6 at the tip is rotatably mounted to sometimes rotate the valve stem 5 to close the valve body 4.

A lock lever 8 is swingably supported by a support pin 10 attached to a fixing plate 9 provided on the valve box 3. A concave portion 12 is formed on the lower surface on one end side of the lock lever 8, and the concave portion 12 is locked by a locking portion provided on the arm 7, that is, the projecting pin 11, and locks the valve body 4 to the valve opening position. It has become. The other end of the lock lever 8 is connected to an electric actuator 14 via a compressed spring 13 as shown in FIG.

An end plate 16 is fixed to the fixing plate 9 via a connecting pin 15, and a bracket 18 is fixed to a band-like member 17 attached to the end plate 16 by bolts. By
It is supported vertically.

The electric actuator 14 is connected to a gear unit formed by combining a planetary gear with a DC motor, and an operating shaft 19 is connected to the gear unit. The operating shaft 19 reciprocates by rotating the DC motor. . As shown in FIG. 5A, the distal end of the operating shaft 19 is
Is fixed to the cylindrical body 20 in which is stored. A top member 22 is attached to the tip of the pin of the connecting member 21 connected to the end of the lock lever 8, and the top member 22 contacts the upper end of the spring 13 in the upper part of the cylindrical body 20. The cap 23 is fixed to the upper end of the cylindrical body 20, and an insertion hole is provided at the center thereof so that the connecting member 21 can move up and down.

The electric actuator 14 operates when the seismic intensity caused by the horizontal vibration detected by the seismograph becomes equal to or higher than a set value and an emergency shutoff signal is input to the control device. The electric actuator 14
The controller detects the differential pressure before and after the orifice installed in the conduit that needs abnormality detection and guides it to the differential pressure switch, and when this differential pressure exceeds the set value and an emergency cutoff signal is input. , Can also be activated.

As the electric actuator, an electric jack such as a screw type or a rack drive type can be used.

A hydraulic shock absorber 25 for controlling the rotation speed, that is, the valve closing speed of the valve body 4, is connected to the locking piece 24 provided on the arm 7.

As shown in FIG. 1, on the other end of the valve stem 5,
A clutch 26 is connected coaxially with the clutch 26.
6 is turned on and off by a manual opening / closing device 28 of the valve body 4 by the handle 27. The clutch 26 can also be turned on and off by an electric opening / closing device 29 provided in parallel.

The embodiment of the present invention is configured as described above, and its operation will be described below.

The valve body 4 is normally provided with a lock lever 8
Is locked at the valve open position, and is in an emergency standby state. As described above, when the emergency cutoff signal is input to the control device, the electric actuator 14 is energized and operated, the operating shaft 19 is lowered, and the top member 22 is
, The lock lever 8 is swung upward around the support pin 10 as shown in FIG.

The electric actuator 14 can be released from the locked state only by energizing it for a very short time. Once the locked state is released, the arm 7 is rotated by the weight of the weight 6 and the valve body 4 is closed. As a result, the pipeline can be blocked. Therefore, it is not necessary to continue the energization of the electric actuator 14 during the rotation of the arm 7, and it is only necessary to energize the electric actuator 14 for a very short time at the time of the first lock release. The valve operation is hardly affected, the valve body 4 is prevented from stopping at the intermediate opening, and the pipe line can be reliably and safely shut off. The rotation speed of the arm 7 is controlled by the hydraulic shock absorber 25.
As a result, the valve body 4 is controlled to be slow and the valve body 4 is closed, so that the aforementioned water hammer action is prevented.

Further, a concave portion 12 is formed on the lower surface on one end side of the lock lever 8 to lock the valve body 4 at the valve opening position by locking to the projecting pin 11 provided on the arm 7.
The arm 7 can be reliably locked at the valve opening position of the valve body.

In this state, as shown in FIG. 5 (a), the operating shaft 19 of the electric actuator 14 is raised to push up the end of the lock lever 8, and the recess 12 is inserted into the projecting pin 11 of the arm 7. Since the spring 13 is locked, the upper end of the spring 13 is pressed against the top member 22 and is compressed. This compressed spring 13
The concave portion 12 of the lock lever 8 is
Because it is pressed by the protruding pin 11 of the arm 7 around 0,
The lock state becomes more robust.

When the closed valve element 4 is returned to the fully opened position by the manual opening / closing device 28 or the electric opening / closing device 29, first, the electric actuator 14 is operated to raise its operating shaft, and the lock lever is moved. 8 is returned to the locked position. At this time, since the top member 22 comes into contact with the cap 23 due to the reaction force of the spring 13, the position of the distal end of the lock lever 8 is set to the protruding pin indicated by the one-dot chain line as shown in FIG. 11 (see FIG. 5A).
When the arm 7 is rotated in the valve opening direction by the opening / closing device, and the projecting pin 11 provided on the arm 7 comes into contact with the lower surface of the lock lever 8 on one end side where the concave portion 12 is provided, the top member 22 is moved. By pressing the spring 13, the one end side of the lock lever 8 is easily lifted around the support pin 10, and the recess 12 can be locked to the protruding pin 11.

As described above, the electric actuator 14 is connected via a differential pressure switch to an orifice installed in a pipe requiring an emergency cutoff signal to a control device connected to the seismometer or an abnormality to be detected. It can be activated by any of the emergency shutdown signals to the control device,
It can respond not only to natural disasters such as earthquakes, but also to emergency situations such as pipe damage due to aging.

[0035]

As described above, according to the present invention, it is possible to quickly release the lock lever that locks the valve body to the valve opening position only by energizing the electric actuator for a very short time, and to interlock with the valve body. The valve body can be closed by rotating the arm to be closed, so that the occurrence of an abnormality such as disconnection hardly affects the valve closing operation of the valve body. This prevents the valve body from stopping at the intermediate opening,
The pipe can be reliably and safely shut off.

Further, the electric actuator can be integrally provided in the vicinity of the valve body, and the valve body can be locked at the valve opening position only by locking the concave portion formed at one end of the lock lever to the arm. , Simple structure,
A compact emergency shut-off valve can be realized.

[Brief description of the drawings]

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

FIG. 2 is a front view showing a state where the valve element is locked at an open position.

FIG. 3 is a plan view of the above.

FIG. 4 is a front view showing the unlocked state of FIG. 2;

FIG. 5A is a partially longitudinal front view showing a locking mechanism of the lock lever to the arm, and FIG. 5B is a partially longitudinal front view showing a standby state of the lock lever at the time of returning to the locked state.

FIG. 6 is a perspective view of a prior art emergency shutoff valve.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Emergency shut-off valve 2 Valve body 3 Valve box 4 Valve body 5 Valve stem 6 Weight 7 Arm 8 Lock lever 9 Fixing plate 10 Support pin 11 Projection pin 12 Depression 13 Spring 14 Electric actuator 15 Connection pin 16 End plate 17 Strip member 18 Bracket DESCRIPTION OF SYMBOLS 19 Operating shaft 20 Cylindrical body 21 Connecting member 22 Top member 23 Cap 24 Locking piece 25 Hydraulic shock absorber 26 Clutch 27 Handle 28 Manual opening / closing device 29 Electric opening / closing device 30a, 30b Water pipe

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3H052 AA02 BA03 BA25 CD09 EA02 3H061 AA02 BB06 CC02 CC09 CC12 DD03 EA04 EB05 EB10 EC02 GG02 3H064 AA02 BA05 BA15 CA09 CA10 CA12 DA06 DB09

Claims (2)

[Claims] 1. A valve body having a valve body rotatably mounted inside a valve box, an arm rotating in conjunction with a valve rod of the valve body, and closing the valve body mounted on the arm. A weight that urges the arm in a direction, a lock unit that locks the arm at a valve opening position of the valve body, and a lock release unit that releases the lock in order to rotate the arm in a valve closing direction of the valve body. An emergency shut-off valve having a shock absorber for controlling the rotation speed of the arm, wherein the lock means is a rock lever pivotally supported and the arm is disengaged from the lock lever. An emergency shut-off valve, comprising an electric actuator as the unlocking means. 2. A lower surface on one end side of the lock lever, which is formed with a concave portion for engaging the lock portion of the arm to lock the lock lever with the arm, and the other end of the lock lever is formed with the concave portion. The emergency shut-off valve according to claim 1, wherein the emergency shut-off valve is connected to the electric actuator via a spring for pressing the electric actuator against the locking portion.