JPS6032468Y2 - emergency shutoff valve - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an emergency shutoff valve that automatically opens a pipeline halfway or shuts it off completely in an emergency such as when an earthquake of a predetermined seismic intensity or higher occurs.

Conventionally, under normal conditions, the valve body is locked in a fully open state by a mechanical locking mechanism, and when an earthquake of a predetermined seismic intensity or higher occurs, the valve body is released from the locked state by an emergency signal sent from a seismometer, etc. An emergency shutoff valve is known in which the valve body is automatically rotated in the closing direction by the potential energy of the weight to shut off the pipeline.

For example, Utility Application No. 52-31346 (Utility Application No. 53-125
12 inch) includes a valve device interposed in the pipe, an energizing device for rotationally urging the valve body of the valve device in the valve closing direction, and an energizing device for rotating and urging the valve body of the valve device in the valve closing direction, and a valve device for controlling the valve body of the valve device in an emergency situation in which the valve body should be closed. a detection device that detects and transmits a detection signal; a lock holding device that locks and holds the valve body of the valve device in an open state against the biasing force of the biasing device; and a detection signal that is transmitted from the detection device. An emergency shutoff valve is disclosed, comprising a release device that operates to release the lock holding state of the lock holding device when the lock holding device is locked.

Particularly when this type of emergency shutoff valve is installed in a water supply and distribution pipeline, for example, once the pipeline is shut off by the emergency shutoff valve, there will be no water in the downstream pipeline due to the use of water. There is a high risk that air will accumulate and create negative pressure inside the pipes, causing damage.

Also, when the emergency shutoff valve is opened to allow water to flow into the pipeline, careful and large-scale water flow work is required to avoid causing a large water hammer and causing a serious accident.

Furthermore, if the pipe line is shut off by the emergency shutoff valve, it becomes impossible to supply water through the regular water supply route, increasing the difficulty of water supply measures and causing inconvenience to each household.

Therefore, it is necessary to avoid shutting off the pipeline using the emergency shutoff valve as much as possible except in situations where it is absolutely necessary to shut off the pipeline, that is, when the pipeline is damaged.

However, conventional emergency shutoff valves have a structure in which when the valve body is released from the locked state by the locking mechanism in the set state, the valve body is closed all at once from the fully open state to the fully open state.
It is not possible to close the valve body in stages depending on the situation.

In addition, the seismic intensity value at which the valve body of this type of emergency shutoff valve should be closed is determined by taking into account the strength of the ground and pipelines, but in general, the seismic intensity value is set to a lower value in consideration of safety. The current situation is that the emergency shutoff valve is set to 1, and therefore the conventional emergency shutoff valve shuts off the pipeline even if the pipeline is not damaged.

Furthermore, as mentioned above, the conventional emergency shutoff valve has a structure in which when the valve body locking state by the valve body locking mechanism is released, the valve body closes at once from the fully open state to the fully open state.
For example, if the valve body locking state by the valve body locking mechanism is released due to malfunction, the pipeline will also be blocked.

The present invention was developed in view of the above circumstances, and the valve body locking mechanism has an automatic return structure, and the valve body can be closed in stages depending on the situation such as the seismic intensity. In the case of a mild earthquake, the valve body closes halfway in response to the set seismic intensity and locks again at that position, allowing water to be supplied via the steady water supply route without interrupting the pipeline. In addition, even if the valve body locking state by the valve body locking mechanism is released due to a messenger malfunction in the set state, the valve body will not fully close but will automatically lock in the partially opened state and will absolutely cut off the pipeline. To provide an emergency shutoff valve that can reliably shut off a pipeline when it becomes necessary to do so.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a side view showing the overall configuration of the present emergency shutoff valve, and FIG. 2 is a front view thereof.

In both figures, 1 is a fluid pipe such as a water supply and distribution pipe, and 2 is a valve box of the present emergency shutoff valve installed therein.

2a is a valve body rotatably mounted in the valve body 2, 3 is a bundle for manually operating the valve body 2a, and 4 is a bundle for decelerating the rotation of the bundle 3 toward one end of the valve shaft 5 (the right end in FIG. 2). A worm reducer 6 is a clutch that engages and disengages the output shaft of the worm reducer 4 and the valve shaft 5.

The base end of a weight attachment lever 7 is attached to the other end (left end in FIG. 2) of the valve shaft 5, and the valve body 2a is moved in the valve closing direction by the potential energy of a weight 7a attached to the tip of the lever 7. is energized by

The valve body 2a is normally locked and held in the fully open position by the locking mechanism 8 against the biasing force of the weight 7a, and the valve body is locked by the locking mechanism 8 by actuating the lock release mechanism 9 in response to an emergency signal transmitted in an emergency. is released, and the valve body 2a is automatically closed by the biasing force of the weight 7a.

As shown in FIG. 3, the locking mechanism 8 includes a plurality of locking claws 10, .
10 degrees, a rotating base plate 11, a rotating claw 12, a rotating plate 13 with an engaging portion, and an engaging lever 14.

Locking claw 10. ．． 10□ is provided projecting from the other end (left end in FIG. 2) of the valve shaft 5 at a predetermined interval in the direction of its rotation, and operates integrally with the valve shaft 5.

An engaging surface 10a that is inclined in one direction is formed on the lower surface of the tip of the locking claws 10□, 10□.

The center portion of the upper end of the rotating base plate 11 is rotatably attached to a mounting plate 15 attached to the outer surface of the valve box 2 with a pin 16.

A spring 17 is stretched between the lower part of one side (the right side in FIGS. 1 and 3) and the mounting plate 15 of the rotating base plate 11 in the valve body locking direction (counterclockwise in FIGS. 1 and 3). ) is biased to rotate.

Excessive rotation of the rotation base plate 11 in the direction of locking the valve body
One side thereof is regulated by a stopper 18 that comes into contact when it is in a substantially vertical state.

This stopper 18 is provided to protrude from the mounting plate 15.

The rotating claw 12 has an engagement surface 1 with a locking claw 101°10□ on the upper end surface.
An engaging surface 12a is formed which slopes corresponding to 0a.

This engaging surface 12a and the locking claw 10. ．． 10□ engaging surface 10
a are removably engaged with each other.

The rotating pawl 12 has a pin 19 at approximately the middle portion of the rotating base plate 1.
It is rotatably attached to 1.

The center of the pin 19 of the rotating claw 12 is the pin 16 of the rotating board 11.
It is below the center of the pin 16 and is offset to the right of the center of the pin 16.

The rotating pawl 12 is biased to rotate in the valve body locking direction (clockwise in FIGS. 1 and 3) by a spring 20 stretched between the rotating pawl 12 and the rotating plate 13 with an engaging portion. .

The rotating claw 12 rotates more than necessary in the valve body locking direction when one side of the claw (the right side in FIGS. 1 and 3) coincides with one side of the rotating base plate 11. It is regulated by a stopper 21 that comes into contact with it.

This stopper 21 is provided to protrude from the rotating base plate 11.

Note that the rotating claw 12 does not come into contact with the stopper 18 of the rotating base plate 11.

The rotating plate 13 with an engaging portion has a substantially L-shaped engaging portion 22 on one side (the left side in FIGS. 1 and 3) with a corner portion having an arcuate surface 13a.

The rotating plate 13 with an engaging portion is rotatably attached to the rotating base plate 11 by a pin 23 at approximately the middle thereof.

The center of the pin 23 is located below the center of the pin 19 of the rotating claw 12.

Also, the center of the pin 16 of the rotating board 11 and the rotating plate 1 with an engaging part
The line 1 passing through the center of the pin 23 of No. 3 is approximately vertical in the valve body locked state shown by the solid line in FIGS. 1 and 3.

The rotating plate 13 with the engaging portion is urged to rotate in the valve body locking direction (clockwise in FIGS. 1 and 3) by the spring 20.

Excessive rotation of the rotating plate 13 with an engaging portion in the valve body locking direction is regulated by a stopper 24 that comes into contact when the other side is approximately parallel to one side of the rotating claw 12. There is.

This stopper 24 is provided to protrude from the rotating base plate 11.

The engagement lever 14 has an engagement roller 25 pivotally attached to one end, and the other end is rotatably attached to the mounting plate 15 with a pin 26.

The engagement roller 25 removably engages with the engagement portion 22 of the rotating plate 13 with an engagement portion, and in the valve body locked state, the engagement portion 2
It engages with the corner arc surface 13a of No. 2.

In this engaged state, the center of the pin 26 and the engagement roller 2
The line 12 passing through the center of the shaft 25a of the shaft 25a is approximately horizontal, and the center of the shaft 25a is slightly (by the middle part in FIG. 3) above the center of the pin 23 of the rotating plate 13 with an engaging portion. It's deviated.

The engagement lever 14 is urged to rotate in the valve body locking direction (counterclockwise in FIGS. 1 and 3) by a weight 27.

The weight 27 is attached to a threaded rod 2B protruding from the other end of the engagement lever 14 so as to be adjustable in position.

The engagement lever 14 is connected to the lock release mechanism 9.

The lock release mechanism 9 has a solenoid 29, and the lower end of the first connecting member 31 is connected to the upper end of the plunger 30 by a pin 32.
It is rotatably mounted on the

A second connecting member 33 is rotatably attached to the upper end of the first connecting member 31 with a pin 34 at its lower end.

This second connecting member 33 has a long hole 3 along its longitudinal direction.
3a, and the shaft 2 of the engagement roller 25 is inserted into this elongated hole 33a.
5a is slidably engaged.

The solenoid 29 is electrically connected to an emergency signal transmitter 35 such as a seismometer.

When the emergency signal is transmitted, the solenoid 29 is energized and the plunger 30 is lowered, causing the first. The engagement lever 14 is rotated clockwise in FIGS. 1 and 3 via the second connecting member 31. It separates from the corner arc surface 13 of 22.

A ball (steel ball) 36 is provided between the mounting plate 15 and the rotating base plate 11 as shown in FIG. 4A.
In this way, the rotary base plate 11 can be smoothly rotated, and a predetermined distance is secured between the rotary base plate 11 and the mounting plate 15.

In FIGS. 1 and 2, 37 is a braking mechanism that controls the closing speed of the valve body 2a, and has a hydraulic cylinder 37a, the lower end of which is rotatably attached to the valve box 2. .

The outer end of the piston rod 37b of the cylinder 37a is rotatably attached to a substantially intermediate portion of the weight attachment lever 7.

Oil piping is connected to both ends of the cylinder 37a, and oil in the oil tank 37c flows into and out of the cylinder 37a via the oil piping.

A throttle valve 37d is interposed in the oil pipe, and the closing operation of the valve body 2a changes depending on the amount of throttle.

Next, the operation of the emergency shutoff valve of the present invention having the above structure will be explained.

Normally, the locking mechanism 8 is in the state shown by the solid line in FIGS. 1 and 3, the locking pawl 101 engages with the rotating pawl 12, and the valve body 2a is locked and held at the fully open position.

In this state, the clutch 6 is disengaged and the weight attachment lever 7
is on the I line, and the potential energy of the weight 7a causes the valve body 2 to
The first-stage locking pawl 10 is latched onto the rotating pawl 12 and the rotating pawl 12 is biased in the direction (counterclockwise) to close the a
gives clockwise rotational force to.

Since the rotating claw 12 is regulated by the stopper 21 on the rotating base plate 11, this rotating force applies a clockwise rotating force to the rotating base plate 11.

The rotating plate 13 with an engaging part attached to the rotating board 11 with a pin 23 is the pin 16 of the rotating board 11 as described above, the pin 23 of the rotating board 13 with an engaging part, and the pin 26 of the engaging lever 14.
A clockwise acting force is applied due to the geometric positional relationship of the roller shaft 25a, but this is due to the rotational base plate 1.
1, that is, the rotating plate 1 with an engaging portion is stopped by the stopper 24 of 1.
3 cannot be rotated in either the clockwise or counterclockwise direction. Therefore, the clockwise rotation of the rotating base plate 11 is restrained, and eventually the rotation of the weight mounting lever 7 in the valve closing direction is locked by the engagement lever 14. In other words, the set state on the ■ line is maintained.

An electrical signal is transmitted from the emergency signal transmitter 35 of the seismometer in which an earthquake of a predetermined seismic intensity or higher has occurred to the solenoid 29, the solenoid 29 is energized, the plunger 30 is pulled downward, and the engagement lever 14 is rotated clockwise. .

When the engagement lever 14 rotates and the rotation pin 26, the tip roller shaft 25a, and the center axes 26, 25a, 23 of the pin 23 of the rotation plate 13 with the engagement portion become straight and reversed, the weight changes. The clockwise rotational force of the rotating base plate 11 that is exerted by the counterclockwise rotational force of the mounting lever 7 is unlocked, and the rotating base plate 11 rotates clockwise against the tensile force of the spring 17. move.

This rotational force also causes the engagement lever 14 to rotate in a clockwise direction contrary to the potential energy of the weight 27 due to the slope action of the engagement portion 22 of the rotation plate 13 with an engagement portion, so that the tip of the engagement lever 14 is engaged. The mating roller 25 rolls on the engaging portion 22 and rotates the rotating plate 1 with the engaging portion.
3 rotates counterclockwise against the tensile force of the spring 20, the engagement lever 14 reaches the lower end of the engagement portion 22, and the engagement lever 14 is aligned with the axis I.
Take the angle of the axis ■ from .

As the engagement lever 14 rotates, the roller shaft 25a at the tip
slides in the elongated hole 33a of the second connecting member 33, and the engagement lever 14 and the second connecting member 33 are arranged almost in a straight line at the angle of the axis {circle around (2)}.

At the same time, as the rotating base plate 11 rotates, the rotating pawl 122 slides in the direction of detachment from the first stage locking pawl 101, and when the engagement lever 14 reaches the axis ■', it is engaged. is removed, and the weight attachment lever 7 is rotated in the valve shutoff direction by the potential energy of the weight 7a.

At this time, since an oil cylinder type braking mechanism 37 is attached to the weight attachment lever 7, the valve shutoff operation is damped so that it does not operate suddenly, and the impact on the pipe line from the water hammer is alleviated.

When the locking claw 10 and the rotating claw 12 are disengaged, the rotating board 1
1 disappears, and the rotating board 11 is immediately pulled back counterclockwise by the tensile force of the spring 17 and automatically returns to its original position, so that the second stage locking claw 10□ The weight attachment lever 7, which is hooked to the rotating claw 12, assumes an angle of the axis {circle around (2)}.

At this time, as the rotating board 11 returns, the rotating plate 13 with the engaging portion
Since it is returned to its original position by the tension of the spring 20, the engagement lever 14 is also returned to the angle of the axis I' by the potential energy of the weight 27, and accordingly, the plunger 30 of the solenoid 29 is also pulled up and returned to its original position. .

The operating position between the first stages of the weight attachment lever 7, that is, the angle of the axis line (2) is such that the flow rate of the emergency shutoff valve is set to 25 to 15%, for example.
It is at the halfway opening position, and water supply is still continuing.

At this point, a worker should go to the site and decide whether to leave it in the same state or shut it off completely, depending on the situation. Determine whether it is okay to return to full throttle and take measures appropriate to the actual situation.

If the condition is left as it is, when a second wave of an earthquake with a predetermined seismic intensity or higher occurs, the weight attachment lever 7, which operates in the same manner as described above, will fall from the axis ■ to the axis ■, and the valve body 2a will be fully closed. The water supply will be shut off and the broken water pipe will be dealt with.

The operating position between the first stages is not limited to the range of 25% to 15% of the flow rate, and the number of stages of the closing operation can be adjusted as necessary by increasing the locking pawl to adjust the flow rate in multiple stages until the valve is fully opened. Of course, there is no problem in doing so.

If an earthquake occurs and the emergency shutoff valve operates to a halfway open position or to a fully closed position and then returns to the fully open set state, engage the clutch 6 and move the manual handle 3 to open the valve body 2a. When rotated in the direction, the locking claw 10. ．． 10□・・
is successively pushed back by the tapered portion of the rear surface against the tension of the spring 20 and rotated clockwise to return the valve to its fully open set state.

As detailed above, the emergency shutoff valve according to the present invention has an automatic return structure for the locking mechanism of the valve body, and has multiple stages of locking claws on the valve stem corresponding to each opening degree of the valve body, so that it can be adjusted from fully open to fully closed. The system is designed to close in stages according to the seismic intensity setting of the emergency signal transmitter of the seismograph, so in the case of an earthquake that does not damage the pipeline, the valve body closes halfway according to the seismic intensity setting. It closes to the open state, secures water supply through the steady water supply route without completely blocking the fluid pipeline, and under these circumstances, based on human judgment of the situation, it is possible to maintain the current state.
By selecting each aspect according to the actual situation, such as fully open state I, fully open return state, etc., and providing room for appropriate operations, it is possible to reliably avoid pipe line interruptions other than situations in which the pipe line is damaged.

In the event of a large earthquake that could damage the pipeline, it is possible to completely close and shut off the system at once using the electronic circuit of the emergency signal transmitter, and the control flow rate and number of stages at each stage can be set as appropriate. Of course.

Furthermore, even if the valve body malfunctions and the valve body locking mechanism is released, the pipe line will not be temporarily cut off and the water supply will not be cut off, and regular operation confirmation tests will not interfere with the water supply. Testing is possible.

If the mid-close operation stage of the valve body is used as the normal flow state, there is no need to separately provide a flow control valve such as a butterfly valve, and the valve body and flow control valve can be used together. It is extremely practical as it can also be applied to water control valve doors.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; Fig. 1 is a side view showing the overall configuration, Fig. 2 is a front view of the same, and Fig. 3 is a detailed side view of the locking mechanism and release mechanism. The dashed dotted lines indicate the operating positions of each member in the unlocked state. Figure 4 shows P-Q-R-3-TUV- in Figure 3.
It is a sectional view along the W and x-y-z lines. 2...Valve box, 2a...Valve body, 5...
...Valve stem, 8...Lock mechanism, 9...
・Lock release mechanism, 10. . 10□... Locking claw, 11... Rotating board, 12... Rotating claw, 13... Rotating plate with engaging portion, 14 ...Engagement lever 29...
... Solenoid, 37... Control mechanism.

Claims (1)

[Scope of utility model registration request] Normally, the locking mechanism locks the valve body in the fully open position,
In an emergency shutoff valve that automatically closes the valve body by activating the lock release mechanism and unlocking the lock mechanism in response to an emergency signal transmitted in an emergency, the lock mechanism is configured to be connected to the valve body. A plurality of locking pawls are disposed at predetermined intervals in the operating direction of the valve body and at positions corresponding to a plurality of opening degrees of the valve body so as to be able to operate in unison, and a rotatable locking pawl is provided on the outer surface of the valve body. a rotary base plate rotatably mounted and biased to rotate in the valve body locking direction; A rotating pawl that is rotationally biased toward the valve body, a rotating plate with an engaging portion that is rotatably attached to the rotary base plate and that is rotatably biased in the valve body locking direction, and a rotary plate that is rotatably attached to the rotary base plate and that is rotatably biased toward the valve body locking direction. The valve body is movably attached and is biased to rotate in the direction of locking the valve body that engages the concave arc surface of the engagement portion while following the engagement portion of the rotating plate, and the arc is rotated by the operation of the lock release mechanism. and an engagement lever that is rotated in a direction away from the surface, and when the engagement lever is removed from the circular arc surface of the rotation plate with the engagement portion, it is rotated via the locking pawl and the rotation pawl. Due to the closing direction operating force of the valve body transmitted to the movable base plate, the rotary base plate and the rotary pawl rotate against their respective biasing forces, and the engagement between the locking pawl and the rotary pawl is disengaged, and the valve is closed. The valve body is configured such that the valve body automatically operates in the direction of closing the opening, and then immediately the retaining lever, the rotating base plate, the rotating pawl, and the rotating plate with the engaging portion can automatically return to the valve body locking direction. An emergency shutoff valve characterized by: