JP2017110727A - Emergency shutdown valve actuator and emergency shutdown device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an emergency shutdown valve actuator operated under a simple configuration.SOLUTION: This invention comprises a piston rod 407 connected to a piston 403 of a cylinder 401 and a valve shaft 201 of a shutdown valve 2 for rotatably driving the valve shaft by opening or closing the shutdown valve as being displaced in response to the piston; a high pressure gas supply mechanism 6 operated by an external signal, discharging gas to a first cylinder chamber 405a of the cylinder and moving the piston toward the valve opening position; a piston pressing member 409 movably arranged at a second cylinder chamber 405b; a biasing member 411 for biasing the piston pressing member toward the piston; and an engaging mechanism 5 for use in engaging with the piston pressing member, operated by the external signal to release the piston pressing member, causing the piston pressing member to press the piston present at the valve closing position to press by a biasing force by the biasing member and to move the piston toward the valve opening position.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an emergency cutoff valve actuator and an emergency cutoff device.

  It has a piston that can slide in the cylinder, and a piston rod that rotates the valve shaft of the shutoff valve in conjunction with the piston, and supplies the high-pressure gas into the cylinder from the high-pressure gas supply unit to displace the piston. An emergency shut-off actuator that opens or closes a shut-off valve is known (for example, see Patent Document 1).

  The emergency shut-off actuator according to Patent Document 1 includes first and second high-pressure gas supply units that supply high-pressure gas to a first cylinder chamber defined by a piston, and a third that supplies high-pressure gas to a second cylinder chamber. High pressure gas supply unit. In an emergency such as an earthquake, the first high-pressure gas supply unit supplies high-pressure gas to the first cylinder chamber to displace the piston, thereby rotating the valve shaft via the piston rod and closing the shut-off valve. When safety is confirmed after the valve is closed, the third high-pressure gas supply unit supplies the high-pressure gas to the second cylinder chamber and displaces the piston in the direction opposite to that at the time of closing the piston rod. The valve shaft is rotated via the valve to open the shut-off valve.

Japanese Utility Model Publication No. 2-67178

  The emergency shut-off actuator according to Patent Document 1 needs to be provided with first to third high-pressure gas supply units, piping for connecting each high-pressure gas supply unit and the inside of the cylinder, and the structure is complicated.

  The present invention has been made in view of the above, and an object thereof is to provide an emergency cutoff actuator that operates with a simple configuration.

  According to one aspect of the present invention, a piston is provided inside the cylinder so as to be movable between a valve opening position and a valve closing position, and a piston defining a first cylinder chamber and a second cylinder chamber inside the cylinder; , Connected to the piston and the valve shaft of the shut-off valve, displaced along with the piston, the shut-off valve is opened when the piston moves toward the valve open position, and the piston is closed A piston rod that rotationally drives the valve shaft so as to close the shut-off valve when moving toward the valve position, and an external signal that operates to release gas into the first cylinder chamber. A gas generation source that moves toward the valve opening position; a piston pressing member that is movably provided in the second cylinder chamber; and a biasing member that biases the piston pressing member toward the piston; The piston pressing member that is biased by the biasing member is locked, and is actuated by an external signal to open the piston pressing member, and the piston pressing member is urged by the biasing force to close the valve closing position. An emergency shut-off valve actuator, comprising: a locking mechanism that presses the piston that is present in the valve and moves the piston toward the valve opening position.

  According to the embodiment of the present invention, an emergency cutoff actuator that operates with a simple configuration is provided.

It is a figure which illustrates the emergency cutoff device in an embodiment. It is a figure which illustrates the composition of the piston rod and link in an embodiment. It is a figure which illustrates the high pressure gas supply unit in an embodiment. It is a figure which illustrates the actuator for emergency cutoff in an embodiment. It is a figure which illustrates the latching mechanism in embodiment. It is a figure which illustrates the actuator for emergency cutoff in an embodiment. It is a figure which shows the modification of the actuator for emergency cutoff.

  Hereinafter, embodiments for carrying out the invention will be described with reference to the drawings. In the drawings, the same components are denoted by the same reference numerals, and redundant description may be omitted.

  FIG. 1 is a diagram illustrating an emergency cutoff device 100 according to the embodiment. The emergency shut-off device 100 is provided in the middle of a pipeline that feeds a combustible fluid such as city gas or oil, and shuts off the pipeline in an emergency such as an earthquake or a fire.

  As shown in FIG. 1, the emergency shut-off device 100 includes an emergency shut-off actuator 1 and a shut-off valve 2 indicated by a one-dot chain line in FIG. 1.

  The shut-off valve 2 is normally kept open and is driven to close by the emergency shut-off actuator 1 in an emergency such as an earthquake or fire. When the valve shaft 201 rotates, the shut-off valve 2 is configured to open or close when a valve body (not shown) rotates together with the valve shaft 201. The shutoff valve 2 is, for example, a ball valve or a butterfly valve, but is not limited thereto.

  The emergency shut-off actuator 1 includes a main body 3, a piston mechanism 4, a locking mechanism 5, and a high-pressure gas supply mechanism 6.

  The main body 3 includes a main body case 301, an output shaft 303, and a link 305. The main body case 301 has a link chamber 309 and is mounted and fixed on the upper part of the shutoff valve 2.

  The output shaft 303 extends in the vertical direction in FIG. 1 and is provided through the link chamber 309 and is rotatably supported by the main body case 301. The lower end portion of the output shaft 303 is connected and fixed to the valve shaft 201 of the shutoff valve 2. The output shaft 303 is provided so as to be rotationally driven in conjunction with a piston mechanism 4 described later.

  When the output shaft 303 rotates, the valve shaft 201 connected to the output shaft 303 rotates to open or close the shut-off valve 2. Further, the upper end 303a of the output shaft 303 is exposed from the main body case 301. For example, the output shaft 303 is manually rotated using a manual operation handle fitted to the upper end 303a to open or close the shut-off valve 2. You can also.

  The link 305 is fixed to the output shaft 303 in the link chamber 309 and is engaged with a connecting pin 408 provided on the piston rod 407 of the piston mechanism 4. When the piston rod 407 is displaced in the direction A or B shown in FIG. 1 in conjunction with the piston 403 in the piston mechanism 4, the link 305 that engages with the connecting pin 408 provided on the piston rod 407 rotates. When the link 305 rotates in conjunction with the piston 403, the output shaft 303 to which the link 305 is fixed rotates, the valve shaft 201 rotates with the output shaft 303, and the shut-off valve 2 is opened or closed.

  The piston mechanism 4 includes a cylinder 401, a piston 403, a piston rod 407, a spring receiver 409, and a coil spring 411.

  The cylinder 401 has a hollow cylindrical shape, one opening is connected to the link chamber 309 of the main body case 301, and the other opening is closed by the lid 402. Due to the opening 311 provided in the main body case 301, the internal space of the cylinder 401 and the interior of the link chamber 309 are in communication with each other.

  The piston 403 is provided so as to be slidable in the directions of arrows A and B inside the cylinder 401, and in the cylinder 401, the first cylinder chamber 405a on the main body case 301 side and the second cylinder chamber on the lid 402 side are provided. 405b. The sizes of the first cylinder chamber 405a and the second cylinder chamber 405b vary depending on the position of the piston 403.

  One end of the piston rod 407 is connected to the piston 403, and a connecting pin 408 provided at the other end is engaged with the link 305 of the main body 3. The piston rod 407 moves together with the piston 403 in the A direction or B direction when the piston 403 moves in the A direction or B direction.

  FIG. 2 is a diagram illustrating the configuration of the piston rod 407 and the link 305 in the embodiment. As shown in FIG. 2, the piston rod 407 is engaged with a link 305 fixed to the output shaft 303 by a connecting pin 408. When the piston rod 407 moves in the direction A or B in conjunction with the piston 403 (see FIG. 1), the link 305 engaged with the piston rod 407 rotates, and the output shaft 303 to which the link 305 is fixed rotates. .

  In the configuration exemplified in this embodiment, when the piston rod 407 moves in the A direction in conjunction with the piston 403, the link 305 and the output shaft 303 rotate in the clockwise direction in FIG. When the output shaft 303 rotates in the clockwise direction, the valve shaft 201 connected to the output shaft 303 also rotates in the clockwise direction, and the shut-off valve 2 is opened.

  Further, when the piston rod 407 moves in the B direction in conjunction with the piston 403, the link 305 and the output shaft 303 rotate counterclockwise in FIG. 2, and the valve shaft 201 connected to the output shaft 303 similarly. The shut-off valve 2 is closed by rotating counterclockwise.

  In this embodiment, when the piston 403 moves in the A direction and approaches the main body case 301, the shutoff valve 2 opens, and when the piston 403 moves in the B direction and approaches the lid 402, the shutoff valve closes. As shown in FIG. 1, when the piston 403 moves to the valve opening position (the position closest to the main body case 301 in the movable range of the piston 403), the shutoff valve 2 is fully opened. As shown in FIG. 4, when the piston 403 moves to the valve closing position (the position closest to the lid 402 in the movable range of the piston 403), the shutoff valve 2 is completely closed and the valve is closed.

  The piston 403 is held at the valve open position and keeps the shut-off valve 2 in an open state except in an emergency such as an earthquake or a fire. In an emergency, the piston 403 moves in the B direction from the valve opening position toward the valve closing position by the high pressure gas supplied from the high pressure gas supply mechanism 6.

  The high-pressure gas supply mechanism 6 is connected to the link chamber 309 of the main body case 301 and supplies the high-pressure gas to the first cylinder chamber 405a through the link chamber 309 in the event of an emergency such as an earthquake or a fire to open the piston 403. Move in the B direction from the position toward the valve closing position.

  FIG. 3 is a diagram illustrating the high-pressure gas supply mechanism 6 in the embodiment. The high pressure gas supply mechanism 6 includes a solenoid 610, an opening mechanism 620, a high pressure gas container 630, and a pipe 640.

  The opening mechanism 620 includes a rod 621 provided with a cutter 622 at an end portion on the high-pressure gas container 630 side, a coil spring 623 that urges the rod 621 toward the high-pressure gas container 630, and a locking ball 624 that locks the rod 621. Have

  The rod 621 is locked at an upper position where the coil spring 623 is held in a compressed state by a locking ball 624 whose displacement is limited by a plunger 611 driven in the vertical direction in FIG.

  The solenoid 610 operates in response to an emergency operation signal as an external signal transmitted from, for example, a seismic detector or a fire detector, and lifts the plunger 611 upward to displace the locking ball 624, thereby locking the rod 621. Solve the condition. When the rod 621 is released from the locked state, the rod 621 is biased by the coil spring 623 and moves toward the high-pressure gas container 630. When the rod 621 moves toward the high pressure gas container 630, the cutter 622 breaks through the sealing plate 631 provided in the high pressure gas container 630.

  The high-pressure gas container 630 is an example of a gas generation source, and is a container in which high-pressure gas such as nitrogen gas or carbon dioxide gas is sealed. When the sealing plate 631 is broken by the cutter 622, the high-pressure gas sealed inside the high-pressure gas container 630 passes through the link chamber 309 of the main body case 301 via the high-pressure gas supply path 312 (see FIG. 1). And is supplied from the opening 311 to the first cylinder chamber 405 a of the cylinder 401.

  When the high pressure gas is supplied to the first cylinder chamber 405a of the cylinder 401, as shown in FIG. 4, the piston 403 is pushed by the high pressure gas filling the first cylinder chamber 405a and moves toward the valve closing position. When the piston 403 moves in the direction B toward the valve closing position, the piston rod 407, the output shaft 303, and the valve shaft 201 are driven in conjunction with the piston 403 to close the shutoff valve 2.

  The piston 403 that has been moved to the valve closing position by the high pressure gas supplied from the high pressure gas supply mechanism 6 is pressed by a spring receiver 409 as a piston pressing member after the safety is confirmed after the occurrence of an earthquake or fire, and is moved to the valve opening position. Move to open the shutoff valve 2. Thereafter, the high-pressure gas filled in the first cylinder chamber 405a gradually flows out into the second cylinder chamber 405b through the orifice 403a formed in the piston 403, and further, the high-pressure gas flowing into the second cylinder chamber 405b It is discharged outside through a passage (not shown). As a result, the pressure in the first cylinder chamber 405a and the second cylinder chamber 405b are the same pressure. The orifice 403a is a communication hole that allows the first cylinder chamber 405a and the second cylinder chamber 405b to communicate with each other.

  The spring receiver 409 is movably provided in the second cylinder chamber 405b of the cylinder 401. The spring receiver 409 includes a disk-shaped spring receiver 409a and a locking shaft 409b that protrudes from the central portion of the spring receiver 409a to the opposite side of the piston 403.

  The spring receiver 409 is locked by the locking mechanism 5 at the position shown in FIGS. 1 and 4 so that the coil spring 411 provided between the spring receiver 409a and the lid 402 is in a compressed state.

  FIG. 5 is a diagram illustrating the locking mechanism 5 in the embodiment. The locking mechanism 5 includes a housing 510, a first holder 520, a second holder 530, a stopper 540, and a solenoid 550.

  The housing 510 is a cylindrical member, and is fixed to the lid 402 so as to cover the end of the locking shaft 409b that penetrates the lid 402. A solenoid 550 is fixed on the opposite side of the housing 510 from the lid 402.

  The first holder 520 is a cylindrical member, is movably provided in the housing 510, and is urged in the A direction by a coil spring 511. In the first holder 520, an engagement pin 520 a provided at the end opposite to the lid 402 is engaged with the engagement portion 551 of the solenoid 550. The first holder 520 has a large-diameter portion 520b at the end on the lid 402 side, and a small-diameter portion 520c having an inner diameter smaller than that of the large-diameter portion 520b on the solenoid 550 side than the large-diameter portion 520b. The first holder 520 is formed by the large diameter portion 520b and the small diameter portion 520c so that the inner diameter decreases stepwise from the lid 402 side.

  The second holder 530 is a cylindrical member, is provided in the first holder 520, is fixedly connected to the housing 510, and is held between the lid 402 and the housing 510. Yes. The second holder 530 has a plurality of locking holes 530a, and a locking ball 513 is fitted in each locking hole 530a.

  The stopper 540 is provided in the second holder 530 and is urged in the A direction by a coil spring 515. The stopper 540 is displaced in the A direction when the locking mechanism 5 releases the locking shaft 409b of the spring receiver 409, and prevents the locking ball 513 from dropping from the locking hole 530a.

  In the locking mechanism 5, a locking ball 513 whose displacement to the housing 510 side is restricted by the small diameter portion 520 c of the first holder 520 fits into a locking groove 409 c provided at the end of the locking shaft 409 b. Thus, the spring receiver 409 is locked.

  When safety is confirmed after the high-pressure gas supply mechanism 6 supplies high-pressure gas and moves the piston 403 to the valve-closed position and closes the shut-off valve 2 in an emergency, for example, a locking mechanism is operated from the operation panel. A valve opening signal is transmitted to 5 as an external signal.

  When a valve opening signal is transmitted to the locking mechanism 5, the solenoid 550 is driven to move the first holder 520 in the B direction against the urging force of the coil spring 511. When the first holder 520 moves in the B direction to a position where the large diameter portion 520b faces the locking hole 530a of the second holder 530, each locking ball 513 can be displaced from the position shown in FIG. It becomes a state. In this state, each locking ball 513 is displaced away from the locking shaft 409b and approaches the housing 510, and is released from the locking groove 409c to release the locking shaft 409b.

  When the locking shaft 409b is released from the locking mechanism 5, the spring receiver 409 moves in the A direction by the urging force from the coil spring 411 as shown in FIG. At this time, the spring receiver 409 presses the piston 403 toward the main body case 301 and moves the piston 403 in the A direction from the valve closing position to the valve opening position. In this way, the piston 403 is moved to the valve opening position by being pressed by the spring receiver 409, so that the piston rod 407, the output shaft 303 and the valve shaft 201 are driven in conjunction with the piston 403 to open the shut-off valve 2. .

  In this way, the locking mechanism 5 releases the spring receiver 409 that has been locked and presses the piston 403 in accordance with, for example, a valve opening signal transmitted from the operation panel, thereby moving the piston 403 to the valve closing position. To the valve opening position to open the shut-off valve 2.

  As described above, the emergency shut-off actuator 1 according to the present embodiment normally has the piston 403 in the valve open position and the shut-off valve 2 kept in the valve open state as shown in FIG. The stop mechanism 5 locks the spring receiver 409. In the normal state shown in FIG. 1, for example, when an emergency operation signal is transmitted from a seismic device, a fire detector, or the like, high pressure gas is supplied from the high pressure gas supply mechanism 6 to the first cylinder chamber 405a. When the high pressure gas is supplied to the first cylinder chamber 405a, the piston 403 moves in the B direction from the valve opening position toward the valve closing position, as shown in FIG. The output shaft 303 and the valve shaft 201 are driven, and the shutoff valve 2 is closed.

  Further, after the shutoff valve 2 is closed, for example, when a valve opening signal is transmitted from the operation panel, as shown in FIG. 6, the spring receiver 409 unlocked by the locking mechanism 5 is moved to the piston 403. And the piston 403 moves in the direction A toward the valve opening position. Thus, when the piston 403 moves in the A direction from the valve closing position toward the valve opening position, the piston rod 407, the output shaft 303, and the valve shaft 201 are driven in conjunction with the piston 403 to open the shut-off valve 2. To do.

  As described above, the emergency shut-off actuator 1 according to the present embodiment operates according to the emergency operation signal transmitted in the event of an emergency, closes the shut-off valve 2, and operates according to the valve opening signal transmitted after the safety confirmation. Thus, the shutoff valve 2 can be opened.

  According to the emergency shut-off actuator 1 in the present embodiment, a locking mechanism is provided without providing a high-pressure gas generating mechanism for valve opening, a pipe for supplying high-pressure gas into the cylinder from the high-pressure gas generating mechanism for valve opening, or the like. 5 can be operated to open the shut-off valve 2. Therefore, the shut-off valve 2 can be closed or opened by operating with a simpler configuration.

(Modification)
FIG. 7 is a view showing a modification of the emergency cutoff actuator 1. The emergency shut-off actuator 1 shown in FIG. 7 differs from the above-described embodiment in the configuration of the spring receiver 409 and the locking mechanism 5. In FIG. 7, the same parts as those in the above-described embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  The spring receiver 409 in the modification shown in FIG. 7 has a disk-shaped spring receiver 409d and a locking hole 409e provided on the outer periphery of the spring receiver 409d, and is movable to the second cylinder chamber 405b of the cylinder 401. Is provided. The spring receiver 409 is locked by the locking mechanism 5 so that the coil spring 411 provided between the spring receiver 409d and the lid 402 is in a compressed state and receives a biasing force from the coil spring 411.

  The locking mechanism 5 includes a solenoid 570 and a locking pin 571. The solenoid 570 is provided on the side surface of the end portion of the cylinder 401 on the lid 402 side. The locking pin 571 passes through the cylinder 401 and fits into the locking hole 409e of the spring receiver 409, and locks the spring receiver 409 at the position shown in FIG. 7 so that the coil spring 411 is in a compressed state. The solenoid 570 operates in response to, for example, a valve opening signal transmitted from the operation panel, and lifts the locking pin 571 to release the spring receiver 409 from the locked state.

  The emergency shut-off actuator 1 opens the piston 403 by the high-pressure gas supplied from the high-pressure gas supply mechanism 6 to the first cylinder chamber 405a when an emergency operation signal is transmitted from, for example, a seismic detector or a fire detector. It moves in the B direction from the position toward the valve closing position. When the piston 403 moves in the B direction toward the valve closing position, the piston rod 407, the output shaft 303, and the valve shaft 201 interlocked with the piston 403 are driven to close the shutoff valve 2.

  After the shutoff valve 2 is closed in an emergency, for example, when safety is confirmed and a valve opening signal is transmitted from the operation panel, the solenoid 570 pulls up the locking pin 571 to the outside of the cylinder 401, whereby the locking mechanism 5 releases the spring receiver 409. When the spring receiver 409 is released from the locking mechanism 5, it moves in the A direction by the urging force from the coil spring 411. At this time, the spring receiver 409 presses the piston 403 toward the main body case 301 and moves the piston 403 in the A direction from the valve closing position toward the valve opening position. When the piston 403 moves to the valve opening position, the piston rod 407, the output shaft 303, and the valve shaft 201 interlocked with the piston 403 are driven to open the shut-off valve 2.

  As described above, the emergency shut-off actuator 1 opens the shut-off valve 2 by moving the piston 403 from the valve-closing position toward the valve-opening position by the spring receiver 409 and the locking mechanism 5 illustrated in FIG. You may make it valve. According to the configuration according to the above-described modification, the locking mechanism 5 can be configured more simply.

  Although the emergency shut-off valve actuator and the emergency shut-off device according to the embodiment have been described above, the present invention is not limited to the above-described embodiment, and various modifications and improvements can be made within the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Emergency shut-off actuator 2 Shut-off valve 3 Main body 4 Piston mechanism 5 Locking mechanism 6 High-pressure gas supply mechanism 100 Emergency shut-off device 201 Valve shaft 303 Output shaft 401 Cylinder 403 Piston 405a First cylinder chamber 405b Second cylinder chamber 407 Piston rod 409 Spring bearing (piston pressing member)
411 Coil spring (biasing member)
630 High-pressure gas container (gas generation source)

Claims (2)

A piston provided inside the cylinder so as to be movable between a valve opening position and a valve closing position, and defining a first cylinder chamber and a second cylinder chamber inside the cylinder;
The piston is connected to the valve shaft of the shut-off valve, is displaced along with the piston, opens the shut-off valve when the piston moves toward the valve open position, and the piston closes the valve A piston rod that rotationally drives the valve shaft to close the shut-off valve when moved toward a position;
A gas generation source that operates in response to an external signal to release gas to the first cylinder chamber and moves the piston toward the valve opening position;
A piston pressing member provided movably in the second cylinder chamber;
A biasing member that biases the piston pressing member toward the piston;
The piston pressing member urged by the urging member is locked, and is actuated by an external signal to open the piston pressing member. The urging force of the urging member causes the piston pressing member to close the valve closing position. An emergency shut-off valve actuator, comprising: a locking mechanism that presses the piston existing in the valve and moves the piston toward the valve opening position. The emergency shut-off valve actuator according to claim 1,
An emergency shut-off device comprising the shut-off valve.

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