JPH0861551A - Actuator for emergency shut-off valve - Google Patents

Abstract

PURPOSE: To provide an actuator for emergency shutoff valve, with which the valve to be opened or closed by a piston and cylinder mechanism can be operated manually. CONSTITUTION: A piston and cylinder mechanism 3B of an actuator 3 includes a cylinder 7 installed on the right side face of a casing 3A, a piston 8 sliding within the cylinder 7, and a piston rod 9 whose one end is secured to the piston 8 rigidly. When the piston 8 slides in the direction A, a link 6 is pressed by a coupling pin 15 for the piston rod 9 and rotates clockwise so that a shutoff valve 2 is closed. A ball screw 16 is connected with the left end of the piston rod 9. A manual operation handle 20 is coupled to a coupling part 16h furnished at the end of the male threads 16b of the ball screw 16, and the shutoff valve 2 is opened and closed with a rotating operation made by the operator.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an emergency shutoff valve actuator, and more particularly to an emergency shutoff valve actuator configured to manually operate a shutoff valve that is opened or closed by a piston / cylinder mechanism.

[0002]

2. Description of the Related Art For example, an emergency shutoff device for shutting off a flow path in a pipe when an emergency such as an earthquake or a fire occurs is provided in the middle of a pipe for feeding city gas or oil. An actuator that operates according to a signal output when an emergency occurs is attached to this type of emergency shutoff device, and the valve element of the shutoff valve is driven in the valve closing direction by the driving force of the actuator.

Further, as a shutoff valve applied to an emergency shutoff device, a ball valve, a butterfly valve, etc. of a type for rotating a valve body are often used.

As a conventional actuator for an emergency shutoff valve, there is one having a structure described in Japanese Utility Model Laid-Open No. 2-67178 previously proposed by the present applicant.

The actuator for an emergency shutoff valve of this publication has an opening mechanism for operating the cutter in response to a signal output when an emergency occurs, and a gas source for hermetically filling a high-pressure gas generator inside to open the container by the cutter. More generally, a piston-cylinder mechanism for displacing a piston when a high-pressure gas is supplied from a gas source to drive a valve body of a shutoff valve in a valve closing direction.

A coupling portion for coupling a manually operated handle is projected from the upper end of the shaft integrally provided with the valve body of the shutoff valve. Therefore, when inspecting or repairing the shutoff valve, after the manual operation handle is coupled to the coupling portion provided on the upper end of the shaft of the shutoff valve, the manual operation handle is manually rotated to close the valve.

In this way, the shutoff valve is inspected or repaired with the shutoff valve closed manually. Then, when inspection or repair of the shutoff valve is completed, the manual operation handle is again coupled to the coupling portion provided on the upper end of the shaft of the shutoff valve, and the manual operation handle is manually rotated in the valve opening direction to operate the shutoff valve. Open the valve.

[0008]

However, in the above emergency shutoff valve actuator, since the coupling portion to which the manually operated handle is coupled is provided at the shaft upper end of the shutoff valve, the emergency shutoff valve actuator is provided in the medium pressure pipe of city gas or the like. In the case of the shutoff valve described above, the position of the coupling portion is considerably high due to its relatively large size, and the operator cannot reach it.

Therefore, when inspecting or repairing the shutoff valve, the workbench is used to perform the valve closing operation and the valve opening operation. Therefore, conventionally, since an operator uses a work table to rotate a manual operation handle, there is a problem that operability is poor, labor of the operator increases, and valve closing operation takes time.

Therefore, an object of the present invention is to provide an actuator for an emergency shutoff valve which solves the above problems.

[0011]

The invention according to claim 1 is
A gas generation source that is activated by an external signal and emits a gas; and a cylinder to which gas from the gas generation source is supplied,
A piston / cylinder mechanism comprising a piston provided in the cylinder and displaced by gas supply from the gas generation source, and a piston rod coupled to the piston;
A shaft extending in a direction intersecting with the piston rod is driven in a valve closing direction by displacement of the piston in one direction, and is driven in a valve opening direction by displacement of the piston in the other direction. Shutoff valve, a manual operation shaft provided so as to extend in a direction different from the shaft of the shutoff valve, and the manual operation shaft interposed between the manual operation shaft and the piston rod. Rotation that converts the rotational motion of
And a linear motion conversion mechanism.

The invention according to claim 2 is characterized in that the manual operation shaft is arranged coaxially with the piston rod.

Further, the invention of claim 3 is characterized in that the manual operation shaft is arranged so as to extend in the front-rear direction of the shut-off valve so as to intersect with the piston rod.

[0014]

According to the first aspect of the present invention, the rotation-linear motion conversion for converting the rotational motion of the manual operation shaft into the linear motion between the manual operation shaft and the piston rod of the piston / cylinder mechanism for driving the shutoff valve. By interposing a mechanism, it is possible to set the direction of the manual operation shaft to the front-back direction or side, and to connect the manual operation handle to the manual operation shaft to open or close the shutoff valve. Easy to do.

According to the second aspect, since the manual operation shaft is arranged coaxially with the piston rod, the direction of the manual operation shaft can be set to the side, and the manual operation handle is provided. Is connected to a manual operation shaft protruding laterally of the shutoff valve to easily perform the valve opening or closing operation.

According to a third aspect of the present invention, the manual operation shaft is arranged so as to intersect the piston rod and extend in the front-rear direction of the shutoff valve, and the manual operation handle is projected to the front surface or the rear surface of the shutoff valve. The valve opening or closing operation can be easily performed by connecting to the operation shaft.

[0017]

1 and 2 show a first embodiment of an emergency shutoff valve actuator according to the present invention.

In each figure, an emergency shutoff device 1 is provided in the middle of a pipeline for feeding a combustible fluid such as city gas or oil, for example, and shuts off the pipeline when an earthquake occurs or a fire occurs. The emergency shutoff device 1 generally includes a shutoff valve (indicated by a chain line in FIG. 1) 2 and an actuator 3 disposed above the shutoff valve 2.

The shut-off valve 2 is normally held in an open state, and is closed and driven by the operation of the actuator 3 in an emergency (when an earthquake occurs, a fire occurs, etc.). Further, the shut-off valve 2 has a valve structure of a type that opens or closes by rotating an internal valve body (not shown). In this embodiment, for example, a ball valve or a butterfly valve is used. used.

The actuator 3 has a casing 3A mounted and fixed on the upper portion of the shutoff valve 2 and a piston / cylinder mechanism 3B provided on the side surface of the casing 3A.
An output shaft 4 connected to a valve shaft 2a of the shutoff valve 2 is rotatably supported by a bearing 5 inside the casing 3A.

The output shaft 4 extends in the upward and downward directions, and has a link 6 projecting in the horizontal direction in the middle thereof. The tip of the link 6 is formed in a bifurcated shape, and engages with the connecting pin 15 of the piston rod 9 as described later.

The piston / cylinder mechanism 3B includes a cylinder 7 mounted on the right side surface of the casing 3A, a piston 8 sliding in the cylinder 7, and a piston rod 9 having one end integrally fixed to the piston 8. It has a lid 10 that closes the opening of the cylinder 7.

The piston 8 is provided so as to be slidable in the A and B directions together with the piston rod 9, and when the shutoff valve 2 is open, as shown in FIGS. Valve position).

The piston rod 9 extends in the left and right directions (A and B directions) so as to be orthogonal to the output shaft 4 of the shutoff valve 2, and the piston 8 is fixed to the right end portion by tightening a nut 11. . The left end of the piston rod 9 is inserted into a cylindrical cover 12 that penetrates the casing 3A and projects from the left side surface of the casing 3A.

This piston rod 9 is a cylindrical bearing 1
3, 14 has a connecting pin 15 which is rotatably supported and which extends in the vertical direction at an intermediate portion thereof.

Further, a ball screw 16 is connected to the left end portion of the piston rod 9, and the ball screw 1 will be described later.
A hollow portion 9a is provided so that the male screw 16b of 6 can enter.

The ball screw 16 functions as a rotation-linear motion conversion mechanism, and as shown in FIG.
A male screw 16b having a spiral groove 16a having a semicircular cross section.
A nut 16c into which the male screw 16b is inserted, a screw groove 16e formed in the nut 16c and having a semicircular cross section, and a screw groove 16e. It is composed of a plurality of balls 16f that roll in the space formed between the balls.

The ball 16f is made of, for example, a steel ball having a high sphericity, and the spiral groove 16a of the male screw 16b and the female screw 1 are used.
Bypass passage 16g for communicating the inside of the spiral space formed with the spiral groove 16d of 6e and both ends of the female screw 16e
It is inserted without a gap inside. And a plurality of balls 1
6f circulates in the nut 16c to convert the rotational movement of the male screw 16b into the linear movement of the nut 16c,
Alternatively, the linear movement of the nut 16c is converted into the rotational movement of the male screw 16b.

The male screw 16b has a female screw 16e on the right end.
And a left end thereof is rotatably supported by a bearing 18 supported by a bearing member 17 fixed to an end portion of the cover 12. Further, a nut 19 for preventing slipping is screwed to the left end of the male screw 16b, and a coupling hole 20a of a manual operation handle 20 is coupled to an end portion penetrating the bearing member 17 and protruding laterally. A coupling portion 16h is provided.

Therefore, the operator connects the manually operated handle 20 to the side of the shutoff valve 2 as will be described later.
Since it is connected to h, the valve closing operation or the valve opening operation can be performed at a lower position than before, and it is not necessary to use a workbench.

The connecting portion 16h is usually a bearing member 17
It is covered with a cap 21 that is screwed in, and when the shutoff valve 2 is opened or closed, the cap 21 is removed and the manual operation handle 20 is joined. The connecting portion 16h
Has a quadrangular cross section when viewed from the axial direction, and the coupling hole 20a of the operation handle 20 is also quadrangular so that the coupling portion 16h fits therein.

The connecting pin 15 is fitted in the engaging groove 6a of the link 6 as shown in FIG. Therefore, the piston 8 is A
When slid in the direction, the link 6 is pressed by the pin 15 and rotated clockwise, thereby rotating the output shaft 4 and the valve shaft 2a of the shutoff valve 2. The shutoff valve 2 is switched from fully open to fully closed when the valve shaft 2a rotates about 90 degrees.

As shown in FIG. 4, the inside of the cylinder 7 is defined by a piston 8 into first and second cylinder chambers 7a and 7b. The first and second cylinder chambers 7a and 7b
Are respectively provided with gas inlet / outlet connection ports 7c and 7d, and one end is directly connected to each of the connection ports 7c and 7d to the pipes 22 and 23. Further, the other end of the pipe 22 is provided with first and second high pressure gas supply units 24 and 25 for generating high pressure gas in an emergency, and the other end of the pipe 23 is provided with a third high pressure gas supply unit. 26 are provided.

Thus, the three high pressure gas supply units 2
Nos. 4 to 26 are provided because after the emergency operation of the piston 8 in the valve closing direction (direction A) by the operation of the first high pressure gas supply unit 24, the operation of the third high pressure gas supply unit 26 is performed. This is because the piston 8 is returned in the valve opening direction (B direction) so that the piston 8 can be driven again in the valve closing direction by the operation of the second high-pressure gas supply unit 25.

Reference numeral 27 is a bleed valve, and pipes 22 and 23
The branched pipes 22a and 23a that are further branched are the pressure receiving portions 27, respectively.
a, 27b. The bleed valve 27 is
It is normally closed, but is an exhaust valve for discharging the gas filled in the displacement direction into the atmosphere when the piston 8 is displaced, and when the pilot pressure from the branch pipe 22a or 23a is applied, Spool (not shown) is A or B
Slide in the direction to switch to the exhaust state.

Numerals 28 and 29 are relief valves, which are provided in the piping 2 respectively.
Connected to pipes 22b, 23b branched from 2, 23,
Depending on the moving direction of the piston 8, the piston 8 is switched to a closed state or an exhausted state to assist the discharge of the gas pushed out by the piston 8.

Numerals 30 and 31 are throttles for gradually discharging the high-pressure gas remaining in the pipes 22 and 23 into the atmosphere.

Since the high pressure gas supply units 24 to 26 have the same structure, the structure of the first high pressure gas supply unit 24 will be described with reference to FIG.

In FIG. 5, a high-pressure gas supply unit 24 has a container (gas generation source) 32 in which a high-pressure gas (for example, nitrogen gas, carbon gas, etc.) is enclosed, and an opening mechanism for opening this container 32 in an emergency. 33 and.

The opening mechanism 33 has a cutter 34 that breaks through the sealing plate 32a of the container 32, and a rod 35 having the cutter 34 at the lower end. A locking ball 36 fitted on the upper portion of the rod 35 has a plunger 38 driven by a solenoid 37.
The rod 35 is pressed by and protrudes from the outer periphery of the rod 35, and the rod 35 is locked by a locking ball 36 at an upper moving position for holding the spring 39 in a compressed state.

Therefore, when an emergency operation signal from a seismic sensor or a fire detector (both not shown) is supplied to the solenoid 37, the cutter 34 is released from the lock as described later, and the inside of the container 32 is released. High-pressure gas is supplied to the above-described piston / cylinder mechanism 3B via the pipe 22.

Next, the operation of the actuator 3 having the above structure will be described.

Normally, the shutoff valve 2 is opened. In the valve body of the shutoff valve 2, the piston rod 9 of the piston / cylinder mechanism 3B is in the valve opening position shown in FIGS.

Here, it is assumed that, for example, an earthquake exceeding a predetermined seismic intensity has occurred. The occurrence of an earthquake is immediately detected by a seismic sensor (not shown), and the seismic sensor outputs an emergency signal.

When the signal from the seismic sensor is supplied to the high-pressure gas supply unit 24, the solenoid 37 is excited and the plunger 35, which presses the locking ball 36 in the outer peripheral direction, is pulled out upward. In this way, the locking ball 36
The rod 35 whose lock has been released due to the force of the spring 39 moves down vigorously, and the cutter 34 breaks through the sealing plate 32a of the container 32 as shown by the alternate long and short dash line in FIG.

As a result, the high pressure gas sealed in the container 32 flows into the pipe 22 through the flow path 40.
At this time, the relief valve 28 is set in the closed state.

Further, the high-pressure gas from the pipe 22 is supplied to the first cylinder chamber 7a in the cylinder 7 to rapidly drive the piston 8 in the A direction.

Further, since the high pressure gas is also supplied from the pipe 22a to the pressure receiving portion 27a of the bleed valve 27, the spool (not shown) of the bleed valve 27 is displaced in the A direction, and the pipe 23 is opened to the atmosphere from the closed state. It switches to the exhaust state.

The relief valve 29 is also set to the exhaust state. Therefore, the gas in the second cylinder chamber 7 b passes through the pipe 23 and the bleed valve 27 and the relief valve 2
9 is exhausted to the atmosphere.

Therefore, the piston 8 of the piston / cylinder mechanism 3B is rapidly displaced in the A direction by using the pressure of the high pressure gas generated in the first high pressure gas supply unit 24 as a driving force. The piston rod 9 also slides in the same direction as the piston 8, and the piston rod 9 rotates the link 6 of the output shaft 4 that engages with the connecting pin 15 in the clockwise direction in FIG. As a result, the valve shaft 2a connected to the output shaft 4 is rotated about 90 ° in the same direction, and the shutoff valve 2 is switched to the closed state to urgently shut off the pipe flow path.

The pipes 16 and 17 are provided with throttles 30 and 31 for outflowing high-pressure gas into the atmosphere, but the flow rate outflowing from the throttles 30 and 31 is small, so the throttle 3 is used.
There is no risk that the emergency shutoff operation will be hindered by leakage from 0 and 31.

Further, when the piston rod 9 moves in the A direction, the nut 16c of the ball screw 16 also moves in the same direction, but since the ball screw 16 is used, the load acting on the piston 8 is small and the piston 8 is less driving power loss.

After the earthquake is stopped and safety is confirmed, the shutoff valve 2 is opened again.

When the shutoff valve 2 is opened, the third high pressure gas supply unit 26 is operated by operating an operation panel (not shown) or the like.
It suffices to input a valve opening signal to.

That is, when the solenoid of the third high pressure gas supply unit 26 is excited by the supply of the valve opening signal, the third high pressure gas supply unit 26 performs the same opening operation as that of the first high pressure gas supply unit 24 described above, and the high pressure gas is supplied to the pipe 23. Supply to.

At this time, the relief valve 29 on the right side in FIG. 4 is switched to the closed state, and the relief valve 28 on the left side is switched to the open state. The bleed valve 21 is also switched to open the pipe 16 to the atmosphere, contrary to the above.

Therefore, the third high pressure gas supply unit 26
High-pressure gas from the second cylinder chamber 7 via the pipe 23.
By being supplied to b, the piston 8 is displaced in the B direction and the piston rod 9 is slid in the same direction. Therefore,
The link 6 that engages with the connecting pin 15 of the piston rod 9.
Rotates counterclockwise in FIG. 2 to drive the valve shaft 2a of the shutoff valve 2 in the valve opening direction.

On the other hand, the gas remaining in the first cylinder chamber 7a is discharged into the atmosphere through the pipe 22 from the bleed valve 27 and the relief valve 28. As a result, the piston 8 can return in the B direction with almost no resistance.

When closing the shutoff valve 2 again, the second
An emergency signal may be supplied to the high-pressure gas supply unit 25, and the same operation as the above-described emergency shutoff operation may be performed.

The emergency shutoff device 1 may be manually closed.

As described above, when the valve is manually closed, for example, when the high pressure gas supply units 24 to 26 fail and the shutoff valve 2 does not close, or the emergency shutoff device 1 is regularly inspected or repaired. Cases are possible.

Next, a case where the shutoff valve 2 is closed by a manual operation will be described.

First, the cap 21 is removed, and the male screw 16b
The manual operation handle 2 is attached to the coupling portion 16h provided at the end of
The 0 coupling hole 20a is fitted. The ball screw 16 is rotated by turning the manual operation handle 20.
Nut 16c of moves in the A direction.

As described above, since the operator connects the manual operation handle 20 to the connecting portion 16h projecting to the side of the shutoff valve 2, even if the shutoff valve 2 is large, it can be operated at a lower position than before. The manual operation handle 20 can be rotated. Therefore, the operator does not need to use a workbench, and the rotational movement by the manual operation handle 20 is converted into a linear movement through the ball screw 16 having high transmission efficiency, so that the valve closing operation is performed with a relatively small operating force. Can be operated.

When the manual operation handle 20 connected to the connecting portion 16h is rotated, the piston rod 9
Will move in the direction A together with the piston 8. As a result, the piston rod 9 rotates the link 6 of the output shaft 4 that engages with the connecting pin 15 in the clockwise direction in FIG.

Therefore, similarly to the case where the piston 8 is driven in the valve closing direction by the pressure of the high pressure gas generated in the first high pressure gas supply unit 24, the valve shaft 2a coupled to the output shaft 4 is in the same direction. And the shutoff valve 2 is switched to the closed state.

In this way, the shut-off valve 2 is manually inspected or repaired while the shut-off valve 2 is closed. When the check valve 2 is inspected or repaired, the manual operation handle 20 is again connected to the connecting portion 16h projecting to the side of the cutoff valve 2, and the manual operation handle 20 is manually rotated in the valve opening direction. To open the shutoff valve 2.

FIG. 6 and FIG. 7 show a second embodiment of the present invention. In the drawings, the same parts as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

Reference numeral 41 is a manual operation shaft, which is provided so as to be orthogonal to the output shaft 4 and the piston rod 9 and extend in the C and D directions (front-back direction) of the shutoff valve 2. The manual operation shaft 41 includes a bearing 4 provided on the casing 3A.
It is rotatably supported by 2 and has a coupling portion 41a protruding from the front surface of the casing 3A at its tip.

The above-described connecting hole 20a of the manual operation handle 20 is connected to the connecting portion 41a. Then, on the outer circumference of the manual operation shaft 41, the male screw 16b of the ball screw 16 is provided.
Are formed. Further, the nut 16c screwed onto the male screw 16b moves in the C and D directions (front-rear direction) along the manual operation shaft 41 as the male screw 16b rotates.

A connecting pin 16i projects from the upper and lower surfaces of the nut 16c of the ball screw 16. The tip end portion of the link 43 is formed in a bifurcated shape, and is engaged with the connecting pin 16i of the nut 16c.

The other end of the link 43 is integrally connected to the output shaft 4 like the link 6. for that reason,
The nut 16c moves in the C and D directions (front-rear direction) and the link 43 rotates to drive the output shaft 4.

Further, on the inner wall of the casing 3A facing the side surface of the nut 16c, the nut 16c is provided with the manual operation shaft 4a.
The rotation is restricted so that it does not rotate around 1, and
A linear bearing 44 is provided to guide the movement in the C and D directions (front-back direction). Therefore, the nut 16c
Guide rail 44 of linear bearing 44 on the side of
A fitting portion 44b that fits in a is provided.

In this second embodiment, since the connecting portion 41a of the manual operating shaft 41 projects from the front surface of the casing 3A, the manual operating handle 20 is fitted into the connecting portion 41a and the shutoff valve 2 is closed manually. When performing a valve or valve opening operation, an operator can perform opening and closing operations from the front of the device. Therefore,
Since the operator connects the manual operation handle 20 to the connecting portion 41a protruding to the front surface of the shutoff valve 2, even if the shutoff valve 2 is large, the operator performs the valve closing operation or the valve opening operation at a lower position than before. be able to. Therefore, the operator does not need to use a workbench, and the rotational movement by the manual operation handle 20 is converted into a linear movement through the ball screw 16 having high transmission efficiency, so that the valve closing operation is performed with a relatively small operating force. Alternatively, the valve can be opened.

8 and 9 show a third embodiment of the present invention. In the drawings, the same parts as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

Reference numeral 51 is a manual operation shaft, which is provided so as to be orthogonal to the output shaft 4 and the piston rod 9 and extend in the C and D directions (front-back direction) of the shutoff valve 2. The manual operation shaft 51 includes a bearing 5 provided in the casing 3A.
It is rotatably supported by 2 and a speed reducer 53 projecting from the front surface of the casing 3A is provided at the tip thereof. Further, a coupling portion 54 projects from the front surface of the speed reducer 53.

The speed reducer 53 has, for example, a planetary gear mechanism (not shown) built therein which is small in size and has a large reduction ratio.

A link 54 is integrally connected to the manual operation shaft 51. The link 54 has a bifurcated distal end, and is engaged with a connecting pin 55 protruding from the piston rod 9. In this embodiment, the link 54 constitutes a rotation-linear motion conversion mechanism.

In this third embodiment, since the connecting portion 54 of the manual operating shaft 51 projects from the front surface of the casing 3A, the manual operating handle 20 is fitted into the connecting portion 54 and the shutoff valve 2 is closed manually. When performing a valve or valve opening operation, an operator can perform opening and closing operations from the front of the device. Therefore, since the operator connects the manual operation handle 20 to the connecting portion 54 protruding to the front surface of the shutoff valve 2, even if the shutoff valve 2 is large, the operator closes or opens the valve at a position lower than the conventional one. It can be performed. Therefore, the operator does not need to use the workbench, and the rotary motion of the manual operation handle 20 causes the reduction gear 53 and the link 54 having the planetary gear mechanism.
Since it is converted into a linear motion via the valve, the valve can be closed or opened with a relatively small operating force.

In each of the above embodiments, the emergency shutoff device provided in the supply line for city gas, oil, etc. is described as an example, but the present invention is not limited to this.

Further, although the above embodiment has been described by taking the case of an emergency caused by an earthquake as an example, it goes without saying that the actuator of the present invention can be operated by an emergency signal other than an earthquake.

[0082]

As described above, according to the first aspect of the present invention, the rotary motion of the manual operating shaft is linear between the manual operating shaft and the piston rod of the piston / cylinder mechanism for driving the shutoff valve. Since a rotation-linear motion conversion mechanism for converting into motion is interposed, it is possible to set the direction of the manual operation shaft to the front-back direction or to the side, and connect the manual operation handle to the manual operation shaft to shut off the shut-off valve. The valve opening or closing operation can be easily performed. As a result, there is no need to use a workbench and the manual operation handle connected at a high position unlike in the past does not operate in an unreasonable posture, improving workability and opening / closing the shutoff valve safely. can do.

Further, according to the second aspect, since the manual operation shaft is arranged coaxially with the piston rod, it is possible to set the direction of the manual operation shaft to the side and use the workbench. Instead, the manual handle can be connected to the manual operation shaft that projects to the side of the shutoff valve to easily perform the valve opening or closing operation.

According to the third aspect of the invention, since the manual operation shaft is arranged so as to intersect with the piston rod and extend in the front-rear direction of the shutoff valve, the manual handle is not used for the shutoff valve. The valve opening or closing operation can be easily performed by connecting to the manual operation shaft protruding to the front surface or the rear surface.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of a first embodiment of an emergency shutoff valve actuator according to the present invention.

FIG. 2 is a transverse sectional view of the first embodiment.

FIG. 3 is a vertical sectional view of a ball screw.

FIG. 4 is a schematic configuration diagram of an emergency shutoff device.

FIG. 5 is a vertical sectional view of a high-pressure gas supply unit.

FIG. 6 is a vertical sectional view of a second embodiment of the present invention.

FIG. 7 is a cross-sectional view of the second embodiment.

FIG. 8 is a vertical sectional view of a third embodiment of the present invention.

FIG. 9 is a cross-sectional view of the third embodiment.

[Explanation of symbols]

 1 Emergency Shutoff Device 2 Shutoff Valve 3 Actuator 3A Casing 3B Piston / Cylinder Mechanism 4 Output Shaft 6 Link 7 Cylinder 8 Piston 9 Piston Rod 16 Ball Screw 20 Manual Operation Handle 24-26 High Pressure Gas Supply Unit 27 Bleed Valve 28, 29 Relief Valve 32 container 33 unsealing mechanism 37 solenoid 41 manual operating shaft 43 link 44 linear bearing 51 manual operating shaft 53 speed reducer 54 link 55 connecting pin

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takashi Komiya 4-1-2, Hirano-cho, Chuo-ku, Osaka City, Osaka Prefecture Osaka Gas Co., Ltd. (72) Inventor Shizuo Kaneko 1-6, Fujimi, Kawasaki-ku, Kawasaki-shi, Kanagawa No. 3 Tokiko Co., Ltd. (72) Inventor Yasuo Ozawa 1-3-6 Fujimi, Kawasaki-ku, Kanagawa Prefecture Tokiko Co., Ltd.

Claims (3)

[Claims] 1. A gas generation source that is activated by an external signal to release a gas, a cylinder to which the gas from the gas generation source is supplied, and a cylinder provided in the cylinder that is displaced by the gas supply from the gas generation source. A piston / cylinder mechanism including a piston and a piston rod connected to the piston, and a shaft extending in a direction intersecting with the piston rod. A shutoff valve driven in the valve closing direction and driven in the valve opening direction by the displacement of the piston in the other direction; and a manual operation shaft provided so as to extend in a direction different from the shaft of the shutoff valve. Intervening between the manual operation shaft and the piston rod,
An actuator for an emergency shutoff valve, comprising: a rotation-linear motion conversion mechanism for converting the rotary motion of the manual operation shaft into a linear motion. 2. The actuator for an emergency shutoff valve according to claim 1, wherein the manual operation shaft is arranged coaxially with the piston rod. 3. The emergency shutoff valve actuator according to claim 1, wherein the manual operation shaft is arranged so as to intersect with the piston rod and extend in the front-rear direction of the shutoff valve.