JPH09236182A - Opening closing device for ball valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform automatic opening and closing of a flow port and instantaneously and automatically close the flow port during the occurrence of service interruption due to the occurrence of an earthquake, in a ball valve. SOLUTION: A valve rod 5 is fixed at a spherical valve element 2 provided with an auxiliary valve plate 3 to close a flow hole 2a communicated with the flow port 1b of a valve casing 1 and a flow port 1b. A valve rod 5 is provided at an upper end with a first gear 6 to rotate the spherical valve element 2 in the opening closing direction by rotating the valve rod 5 through fitting of the first gear in a pinion 13 rotated by a torque motor 11; and a second gear 9 fitted in the pinion 13 and bringing an auxiliary valve plate 3 into pressure adhesion to the valve seat 1c of the flow port 1b to effect closing through vertical movement of the valve rod 5 under the non-rotation state of a first gear 6. Further, a sheave 14 is integrally fixed at the second gear 9 and by stretching a wire 15 run around the sheave 14 through the force of a spring, gears 6 and 9 under an opening state are energized in the closing direction. During interruption to service, the spherical valve element 2 is automatically rotated in the closing direction through the force of a spring and the auxiliary valve plate 3 is forced into pressure adhesion to the valve seat 1c.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ball valve which is opened / closed by the operation of a torque motor and is automatically closed in the event of a power failure.

[0002]

2. Description of the Related Art Conventionally, as a structure of a ball valve, a spherical valve element having a through hole horizontally provided in a valve box having through holes on both sides and communicating with these through holes is internally provided. Then, the outer peripheral surface of the spherical valve body is always in sliding contact with the O-ring provided on the valve seat surface at the opening end of the flow port in a crimped state, and the valve shaft of the spherical valve body is operated to operate the spherical valve. Body 90
It is widely known that the O-ring that slides the spherical valve body is inferior in heat resistance, pressure resistance, etc., although it is widely known that it is configured to open and close the above-mentioned flow port by reciprocatingly rotating in a degree angle range. There is a problem that it cannot be used for a long time. Therefore, although the valve seat is formed on a metal valve seat surface, such a structure not only makes the turning operation of the spherical valve body heavy at the time of opening and closing but also makes the spherical valve body There is a risk of seizure between the valve seat surface and the valve seat surface.

Therefore, the inventors of the present application have found that the Japanese Patent Publication No. 6-2
A ball valve as shown in Japanese Patent No. 1673 has been developed.
This ball valve has a spherical valve body, which is formed by horizontally penetrating through flow holes that can communicate with these flow ports in a valve box having flow ports on both sides. In the ball valve configured to open and close the flow port, a recess is provided in the valve body peripheral surface portion on the side orthogonal to the flow hole of the spherical valve body, and the auxiliary valve plate is brought into contact with and separated from the flow port in the recess. It is arranged so as to be movable in the direction of rotation, and the back side of the sub-valve plate is pressed by a cam member to press the sub-valve plate against the valve seat to close the flow port.

[0004]

According to the ball valve having such a structure, since the auxiliary valve plate is separated from the valve seat of the flow port when the spherical valve element is rotated, the spherical valve element is smoothly rotated. Although it has the advantage that it is possible to move, the closing surface side of the spherical valve body, that is, the circulation port cannot be closed only by directing the sub-valve toward the circulation port side, and the sub-valve plate can be closed by the cam member. Since it is possible to completely close it only by pushing it toward the flow port side and crimping it, it is necessary to operate the cam member together with the rotation operation of the spherical valve element, and therefore, the valve shaft of the spherical valve element. An operation handle is attached to the cam member, and an operation handle for manually operating these operation handles,
The present situation is to open and close manually by operating the operation handle of the cam member.

However, there has been a problem that the manual opening / closing cannot be immediately closed in an emergency such as an earthquake or fire. The present invention has been made in view of the above problems, and an object of the present invention is to provide, in a ball valve having the above structure, an auxiliary valve body having a simple structure for opening and closing a spherical valve body and vertically moving a cam member. (EN) Provided is an opening / closing device for a ball valve which can be automatically attached / detached to / from the valve seat and which can automatically and reliably close in an emergency.

[0006]

In order to achieve the above object, in the ball valve opening / closing device of the present invention, a spherical valve body is rotatably mounted in a valve box having a flow port, and the spherical valve body is rotated. In the through hole is provided with a through hole capable of communicating with the through hole, a recess is formed on the surface side that closes the through hole, and a sub valve plate is disposed in the recess so that the auxiliary valve plate can be contacted and separated from the valve seat of the through hole. A cam member is vertically movably arranged in the spherical valve body on the back side of the sub valve plate, and the sub valve plate is abutted by the abutment of the cam surface of the cam member and the projection protruding on the back surface of the sub valve plate. In a ball valve configured to be brought into pressure contact with a valve seat, the spherical valve body is rotated in the opening and closing direction by the operation of a torque motor arranged outside the valve box so that the flow hole of the spherical valve body is opened. A spherical valve element operating means for performing an operation of communicating with the flow port side and an operation of causing the sub valve plate to face the valve seat, The cam member actuating means for moving the cam member up and down under the inoperable state of the spherical valve element actuating means by the operation of the torque motor to attach and detach the auxiliary valve body facing the valve seat to the valve seat, and the spherical member at the time of power failure. From the open state of the valve element, the spherical valve element operating means and the cam member operating means are operated to make the auxiliary valve plate of the spherical valve element face the valve seat, and then to force-close the valve seat. ing.

In the ball valve opening / closing device according to the second aspect of the present invention, the spherical valve element actuating means fixes the lower end of the valve rod to the central portion of the upper end surface of the cam member provided on the spherical valve element. The first gear, which meshes with the pinion, is integrally connected to the upper end portion of the valve rod, the engaging piece is provided on the first gear, and the notch is provided on the first gear. The member actuating means fixes a screw cylinder to the inner peripheral surface of the second gear, and causes the screw cylinder to be screwed into a screw portion provided at the upper end of the valve rod, and at the same time, to the second gear. A pin body that engages and disengages with the engagement piece of the gear is provided in a protruding manner, and when the notch of the first gear is located in the pinion and its tooth portion is disengaged from the pinion, the torque motor is operated through the pinion. And the pin body of the second gear is connected to the first gear by transmitting only to the second gear. The valve rod is moved up and down by reciprocally rotating within a rotation range that does not engage the joint piece so that the auxiliary valve plate is attached to and detached from the valve seat of the flow port, and the pin body is used as the engaging piece. The spherical valve body is characterized in that the spherical valve body is rotated in the opening / closing direction by abutting and reciprocally rotating the first gear and the second gear integrally through a pinion. .

Further, the invention according to claim 3 is the ball valve according to any one of claims 1 and 2, wherein the forced closing means fixes a wire sheave to the second gear,
One end of the wire is wrapped around this wire sheave, and the other end of the wire is connected to a piston body in a cylinder installed outside the valve box. This piston body is constantly elastically pressed by a spring to rotate the sheave in one direction through the wire. It is characterized by the fact that it is a structure that consists of a force.

In the invention according to any one of claims 1 to 3, the invention according to claim 4 is characterized in that a third gear, which is partially provided with a notch in the first and second gears, is integrally arranged. Set up
The driving pinion meshed with the third gear is fixed to the rotary shaft of the torque motor, and the driving pinion is connected to the driven pinion via the clutch mechanism, and the driven pinion is meshed with the first and second gears. In a normal state, the first and second gears are rotated by rotating the driven pinion from the main drive pinion through the clutch mechanism by the rotation of the torque motor with the clutch engaged, thereby opening and closing the spherical valve element and the cam. When the power failure occurs, the clutch mechanism is opened to disconnect the connection between the torque motor and the driven pinion, and the first and second gears are rotated by the spring force of the forced closing means to rotate the spherical valve body. After the sub-valve plate is opposed to the valve seat, the sub-valve plate is crimped to the valve seat, and the third gear, which rotates integrally with the first and second gears, is attached to the main drive pinion through a notch. It is configured so as not to focus.

[0010]

When the torque motor is operated, the spherical valve element operating first gear and the cam member operating second gear rotate integrally in the same direction via the pinion, and the valve rod does not move up and down. The spherical valve element rotates in the opening / closing direction via the cam member to which the valve rod is fixed. Then, in the open state in which the flow hole of the spherical valve body communicates with the flow hole on the valve box side, the pin bodies of both gears and the engaging pieces are in an abutting state.

When the torque motor is operated in a state where the pin body and the engaging piece are in abutment with each other and both gears are rotated by 90 degrees through the pinion, they are provided on the closing surface side of the spherical valve body. The auxiliary valve plate faces the flow port, and the notch of the first gear reaches the position of the pinion to disengage from the pinion. Further, when the pinion is rotated, the second gear moves to the pin body. Only the second gear rotates while separating the second gear from the locking piece of the first gear. By this rotation, the screw cylinder fixed to the second gear integrally rotates, and the cam member integrated with the valve rod is lowered via the upper end screw portion of the valve rod with which the screw cylinder is screwed. Move. Due to this downward movement, the rear surface projection of the sub valve plate rides on the cam surface of the cam member, and the sub valve plate is pushed toward the flow port side and pressed against the valve seat to completely close the flow port.

In order to change from the closed state to the open state, the torque motor is operated to rotate the pinion in the opposite direction to the above, the second gear rotates in the opposite direction to raise the cam member. , The sub-valve plate and the valve seat are uncompressed, and the pin body comes into contact with the locking piece of the first gear. When the pinion is further rotated in the same direction from this state, the locking piece engaged with the pin body moves integrally with the movement of the pin body due to the rotation of the first gear, and the second gear moves to the first gear. And the spherical valve body reaches the above-mentioned open position where the communication hole communicates with the communication port.

On the other hand, when the spherical valve body is in the open state, the second
The wire body, which is integral with the gear, winds the wire to the maximum extent, and the piston body is in the retracted position with the spring compressed. If the energization of the torque motor is stopped from this open state in an emergency or the like, the torque motor becomes unloaded and the spring force becomes larger than the rotational resistance force between the gears and the pinion, and the restoring force of the spring causes the piston body Moves forward and rotates the sheave while pulling the wire out of the sheave. This rotation direction is the same as the rotation direction that closes the spherical valve body.

Due to the rotation of the sheave, the second gear is integrally rotated, and the rotation is also transmitted to the first gear via the pinion so that both gears are integrally rotated. While the notch of the gear reaches the position of the pinion, the auxiliary valve plate of the spherical valve element faces the flow port,
In this state, only the second gear is further rotated in the same direction by the spring force together with the sheave, and the auxiliary valve plate is moved downward by the above-described operation to be pressed against the valve seat.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Next, a specific embodiment of the present invention will be described with reference to the drawings. In FIGS. 1 and 2, reference numeral 1 designates the valve chamber 1a at the center and the same horizontal axis on both sides of the valve chamber 1a. A metal valve box provided with fluid flow ports 1b, 1b made of a metal cylindrical body communicating with each other on a line, and a spherical valve body 2 made of metal is provided at the center of the valve chamber 1a of the valve box 1 with a vertical axis line. It is arranged to be rotatable around. The outer peripheral portion of the opening end surface of the cylindrical body forming the flow port 1b is projected toward the valve chamber 1a side with respect to the inner peripheral portion, and the protruding end surface is slidably contacted with the outer peripheral surface of the spherical valve body 2. At the same time, the end face of the inner peripheral portion is formed in the valve seat 1c which can be pressed against the outer peripheral portion of the sub valve plate 3 described later.

The spherical valve body 2 is provided with a through hole 2a made of a metal cylinder which can communicate with the through holes 1b and 1b horizontally in a diametrical direction and at a right angle to the through hole 2a. Surface, that is, both side surfaces for closing the flow ports 1b, 1b,
Circular recesses 2b, 2b having a diameter smaller than the diameter of the outer peripheral portion of the opening end face of the flow port 1b and larger than the valve seat 1c are provided, and a vertical surface having a flat back surface in the both recesses 2b. The disk-shaped metal sub-valve plates 3 and 3, which are formed on the outer peripheral portion of the surface and are detachable from the valve seat 1c, are removably inserted. 3a
Is a hemispherical projection having a constant height, which is provided at the center of the back surface of the sub valve plate 3.

Further, in the central portion of the spherical valve body 2, a guide hole 2c which is wide in the auxiliary valve plate 3 and 3 directions and has a rectangular cross section which communicates with the recess 2b is formed in a vertically penetrating state. There is a rectangular plate-shaped cam member 4 in the guide hole 2c.
Is slid up and down. A longitudinally oblong hole 4a having a diameter larger than that of the cylindrical body forming the flow hole 2a is provided at the center of the cam member 4, and the vertically oblong hole 4a is formed.
The flow hole 2a is penetrated in the inside. The cam member 4 has both side end surfaces thereof which, when moving downward, collide with the protrusions 3a of the cam member 4 and allow the protrusions 3a to ride up so that the auxiliary valve plate 3 is passed through the flow port.
A cam surface 4b is formed which is moved to the 1b side and crimped to the valve seat 1c. The lower end of a vertical valve rod 5 is integrally fixed to the central portion of the upper end surface of the cam member 4, and the valve rod 5 is rotatably penetrated and supported by the central portion of the lid plate 1d of the valve box 1. With lid plate
A screw portion 5a is formed on the upper end portion protruding upward from 1d.

Reference numeral 6 designates a first gear which constitutes an operating means of the spherical valve body 2 and is formed in an annular shape having a tooth portion 6a on an outer peripheral surface thereof. The tubular members 6c, which are fixed to the upper ends of the left and right arm members 6b, 6b in a character shape, are integrally fitted to the lower ends of the arm members 6b, 6b and above the valve rod 5 protruding from the lid plate 1d. Are integrated. Therefore, when the first gear 6 rotates, the valve rod 5 integrally rotates via the arm members 6b, 6b and the tubular member 6c. Further, the first gear 6 has a notched portion 7 (shown in FIGS. 6 and 7) formed by cutting a part of the tooth portion 1a into a semicircular shape.
A locking piece 8 is fixed to the lower surface of the outer peripheral portion of the first gear 6 facing the diametrical direction of the cutout portion 7 so as to protrude in the inner diameter direction.

Reference numeral 9 is a second portion which constitutes an operating means of the cam member 4.
A screw cylinder which has the same diameter and the same number of teeth as the first gear 6 and is arranged above the first gear 6 in a superposed state and fixed in the central portion in a penetrating state. The body 9a is screwed onto the threaded portion 5a of the valve rod 5 and the first portion is provided at a proper position on the lower surface.
A pin body 10 facing the locking piece 8 of the gear 6 and capable of coming into contact with and separating from the locking piece 8 is provided so as to project downward.

Reference numeral 11 denotes a torque motor installed on a frame body 12 mounted on the cover plate 1d of the valve box 1. A pinion 13 is fixed to the lower end of the rotary shaft of the torque motor. Two
The gears 6 and 9 are meshed with each other. Reference numeral 14 is a wire sheave concentrically fixed to the outer peripheral portion of the upper surface of the second gear 9.
One end of a wire 15 is wound around the wire 15, and the wire 15 is connected to a piston body 17 in a cylinder 16 fixed horizontally to the back side of the frame body 12, as shown in FIG. By moving 17 forward by the elastic force of the first and second springs 18 and 19, the sheave 14 and the first and second gears 6 and 9 are rotated through the wire 15 to open the spherical valve body 2. A closing means for forcibly closing the state from the closed state is configured.

The structure of the forced closing means will be described in more detail. The wire 15 pulled out from the sheave 14 is inserted into the guide tube 20 fixed in parallel with the cylinder 16 and is passed to the rear end of the cylinder 16. An intermediate sheave 23, which is rotatably supported on a short rod body 22 which is hung around a guide sheave 21 which is rotatably supported and then inserted into a cylinder 16 and fixed to the rear surface of the piston body 17. Further, the intermediate sheave 23 is extended rearward and the other end is fixed to the rear end of the cylinder 16.

On the other hand, a spring mounting member 24 is fixed to the rear end of the short rod body 22 of the piston body 17, and the spherical valve body 2 is pivoted to this spring mounting member 24 from the open state to the closed state. One end portion of the first spring 18 having a constant length that exerts elastic force only when it is fixed is fixed, and the first spring 18 is projected rearward toward the bottom surface 25 of the cylinder 16. Further, the second spring 19 having a smaller elastic force than the first spring 18 is disposed in a compressed state between the rear surface of the piston body 17 and the bottom surface 25 of the cylinder 16. Reference numeral 26 denotes a valve closing detection limit switch mounted on one side surface of the front end portion of the cylinder 16, and reaches the limit switch 26 when the auxiliary valve plate 3 of the spherical valve body 2 completely closes the flow port 1b. The piston body 17 is detected to stop the operation of the torque motor 11.

The operation of the ball valve opening / closing device configured as described above will be specifically described. First, the valve opening state in which the flow hole 2a of the spherical valve body 2 communicates with the flow ports 1b, 1b of the valve box 1 is described. 6, the notch 7 of the first gear 6 is counterclockwise with respect to the pinion 13 of the torque motor 11, as shown in FIG.
It is at a position where an angle of 90 degrees exists, and the pin body 10 of the second gear 9 is engaged with the locking piece 8 of the first gear 6 from the counterclockwise side. Furthermore, the sheave integrated with the second gear 9
The wire 15 is rewound around the wire 14, and the piston body 17 is retracted through the guide sheave 21 and the intermediate sheave 23 against the forces of the first and second springs 18 and 19. 18 and 19 are compressed.

From this state, the torque motor 11 is operated to rotate the pinion 13, and the first and second gears 6 and 9 meshing with the pinion 13 are integrally rotated clockwise in FIG. Then, the rotation of the first gear 6 is transmitted to the valve rod 5 integrally fixing the first gear 6 by key fitting, and the valve rod 5 rotates about the vertical axis in the same direction. The spherical valve element 2 rotates in the same direction via the cam member 4 fixed to the lower end of the valve rod 5. At this time, since the second gear 9 also rotates integrally, the screw cylinder 6a fixed to the center of the second gear 9 and the valve rod 5 in which the screw cylinder 6a is screwed are integrally rotated. The vertical movement of the valve rod 5 by the second gear 9 is not performed.

Then, when the notch 7 reaches the pinion 13 as shown in FIG. 7 by rotating the first gear 6 clockwise by an angle of 90 degrees, the first gear 6 and the pinion 13 are separated from each other. The meshing is released and the first gear 6 becomes unrotatable, and only the second gear 9 is rotated in the same direction by the rotation of the pinion 13. When the cutout 7 of the first gear 6 reaches the pinion 13, the valve rod 5 is rotated 90 degrees by the first gear 6 and the rotation causes the spherical valve body 2 to move through the cam member 4.
Rotate by the same angle, and the auxiliary valve plates 3 and 3 arranged on the closing surface side of the spherical valve body 2 face the flow ports 1b and 1b of the valve box 1.

From this state, as described above, the second gear 9
When only the pin rotates clockwise, the pin body 10 moves away from the locking piece 8 of the first gear 6 and the first gear 6 is in the stopped state, that is, the valve, as shown by the chain double-dashed line in FIG. Since only the second gear 9 is rotated when the rod 5 is stopped, the rotation of the screw cylinder 9a fixed to the second gear 9 causes the rotation of the screw cylinder.
The valve rod 5 is pushed down through the screw portion 5a of the valve rod 5 which is screwed to the 9a. At this time, the first gear 6 also moves downward together with the valve rod 5 and separates downward from the lower surface of the second gear 9.
When the valve rod 5 is pushed down, the cam member 4 integrally fixed to the lower end of the valve rod 5 moves downward, and this downward movement causes the cam surfaces 4b and 4b of the cam member 4 to move the auxiliary valve plates 3 and 3 to the auxiliary valve plates 3 and 3. Rear protrusion
The auxiliary valve plates 3 and 3 are pushed up toward the flow ports 1b and 1b and pressed against the valve seats 1c and 1c so that the flow ports 1b and 1b are completely closed.

On the other hand, when both gears 6 and 9 rotate integrally from the open state of the spherical valve body 2 to the position where the sub valve plates 3 and 3 face the flow port 1b of the valve box 1 as described above, 2 gears 9
A wire 15 whose one end is wound around a sheave 14 which rotates integrally with the wire 15 is pulled out, and the wire 15 is elastically repulsed by the first and second springs 18 and 19 in accordance with the amount of the wire 15 pulled out. The piston body 17 in the cylinder 16 advances while being tensioned. The first and second springs 18 and 19 work together until the cutout 7 of the first gear 6 reaches the pinion 13.
After the piston body 17 is advanced while tensioning 15 and the notch 7 of the first gear 6 reaches the pinion 13, the free end of the first spring 18 separates from the bottom surface 25 of the cylinder 16 and its elastic force is exerted. Cannot be exerted, and the piston body 17 is pushed forward while tensioning the wire 15 only by the second spring 19.

When the piston body 17 reaches the position of the limit switch 26 and comes into contact with the limit switch 26, the auxiliary valve plates 3 and 3 are in a state of completely closing the flow ports 1b and 1b, and the piston body The abutment of 17 actuates the limit switch 26 to send an electric signal to the torque motor 11 to stop the rotation of the pinion 13.

Next, to change from this closed state to the open state,
When the torque motor 11 is actuated to rotate the pinion 13 in the opposite direction to the above, the first gear 6 causes the notch 7 to move into the pinion.
Since it is located on the 13 side, it does not rotate, only the second gear 9 rotates counterclockwise, and the valve rod 5 moves downward through the screwing of the screw cylinder 9a and the screw portion 5a. And the cam member 4 integrated with the valve rod 5 moves upward to move the cam surface 4b and the auxiliary valve plate 3
The engagement state with the protrusion 3a is released, and the crimping force of the auxiliary valve plate 3 with respect to the valve seat 1c is released. On the other hand, the sheave 14 integrated with the second gear 9 is also rotated in the same direction as the second gear 9 to rewind the wire 15 against the force of the second spring 19 and rewind the piston body.
17 is retracted from the limit switch 26 side to compress the second spring 19 and bring the free end of the first spring 18 into contact with the bottom surface 25 of the schilling 16.

When the second gear 9 is rotated counterclockwise until the pressure is released, the pin body 10 protruding from the second gear 9 is moved to the first gear as shown in FIG. 6 reaches a position where it comes into contact with the locking piece 8 of 6. Then, when the second gear 9 is further rotated 90 degrees in the same direction from this state, the pin body is rotated.
The locking piece 8 is pushed forward by 10 and the first gear 6 having the locking piece 8 rotates in the same direction to mesh with the pinion 13,
Both gears 6 and 9 integrally rotate counterclockwise to rotate the valve rod 5, and the spherical valve body 2 is rotated 90 degrees via the cam member 4 fixed to the lower end of the valve rod 5. Let the flow hole 2a
It is connected to 1b and is in an open state. At the time of this operation, the sheave 14 is also integrally rotated to rewind the wire 15 while compressing the first and second springs 18 and 19.

Next, the spherical valve element 2 is thus provided with its through hole.
If a power failure such as an earthquake or fire occurs while the fluid such as gas is being circulated by connecting the 2a to the circulation port 1b, the torque motor 11 becomes unloaded and the first and second pinions 13 are used. The meshing force (braking force) with respect to the two gears 6 and 9 becomes smaller than the turning force of the gears 6 and 9 by the first and second springs 18 and 19, and first, the first and second springs 18 and 19 are The first and second gears 6 and 9 are rotated clockwise from FIG. 6 through the sheave 14 by the large elastic force of the spherical valve element 2 by the same operation as when the valve is closed.
Rotate in the closing direction.

On the other hand, the restoring force of both the springs 18 and 19 causes the piston body 17 to move forward. And the spherical valve body 2
Until the auxiliary valve plates 3 and 3 are rotated 90 degrees to face the flow port 1b, the spherical valve body 2 is quickly rotated by the strong elastic force of both springs 18 and 19. In this state, the cutout portion 7 of the first gear 6 reaches the position shown in FIG. 7 and faces the pinion as described above. When the sub-valve plates 3 and 3 face the flow port 1b, the first spring 18 is completely extended and only the second sprinkle 19 exerts an elastic force to further advance the piston body 17 to further advance the wire. As described above, the second gear 9 is rotated through the sheave 14 while tensioning the pin 15, so that the pin body 10 thereof is separated from the locking piece 8 of the first gear 6.

The valve rod 5 is gradually moved downward via the screw portion 5a of the valve rod 5 which is screwed with the screw cylinder 9a of the second gear 9 by a weak turning force only by the second spring 19, and The cam member 4 fixed to the lower end of the rod 5 moves downward as a unit and its cam surface
By letting the protrusion 3a of the sub valve plate 3 or 3 ride on the 4a, the sub valve plate 3 or 3 is crimped to the valve seat 1c of the flow port 1b of the valve box 1 to close the flow port 1b. In this closed state, the piston body 17 has reached the position where it abuts on the limit switch 26 as described above.

FIG. 8 shows another embodiment of the ball valve opening / closing device of the present invention. In the above embodiment, the pinion 13 of the torque motor 11 is meshed with the first and second gears 6, 9. With this configuration, when the first and second gears 6 and 9 are rotated in the closing direction of the spherical valve body 2 via the sheave 14 by the spring force as described above in the event of a power failure, the torque motor 11 is directly connected. The pinion 13 also rotates integrally,
Due to the load from the torque motor 11 side, it takes several seconds (about 3 seconds) to rotate the valve body until it is closed. Therefore, in this embodiment, the pinion 13 of the torque motor 11 is
(Hereinafter, referred to as a drive pinion) is connected to a driven pinion 31 via a clutch mechanism 30, and the driven pinion 31 is connected to a second pinion 31.
The first and second gears 6 and 9 are meshed with the gear 9 and the idle pinion 32 is meshed, and the clutch mechanism 30 is operated at the time of power failure to directly transmit the rotation of the sheave 14 by the spring force to the drive pinion 13 side. , The first and second gears are transmitted to perform the valve closing operation lightly and quickly (about 1 second). The first gear 6 is configured so as not to mesh with the driven pinion 31.

Explaining this specific structure, the spherical valve disc rotating first gear 6 fitted on the valve rod 5 by key fitting similarly to the above-described embodiment has a large gear as shown in FIG. It is formed in a fan shape with a portion cut out 7a, and a locking piece 8 is projected on the lower surface of one end thereof. On the other hand, the upper screw part of the valve rod 5
The cam member actuating second gear 9 screwed to 5a has an annular third gear 33 fixed to the upper surface thereof and having teeth of the same diameter and pitch as those of the first and second gears 6 and 9. The third gear 33 is meshed with the drive pinion 13 of the torque motor 11, and the first and second gears 6, 9 are meshed with the idle pinion 32 so that both gears 6, 9 are backlashed. It prevents the deviation. Further, the third gear 33 is provided with a notch portion 34 for cutting out a quarter portion thereof so as to be disengaged from the drive pinion 13. A pin body 10 is provided on the lower surface of the second gear 9 so as to be in contact with and separated from the locking piece 8 of the first gear 6, as in the above embodiment.

The opposing surfaces of the drive pinion 13 and the driven pinion 31 are connected via a clutch mechanism 30 composed of a crawler clutch which is constantly urged in the opening direction by a spring 35, and the driven pinion 31 is Central axis of rotation
The lower end of 36 is connected via a lever 37 to a solenoid 38 fixed to the outer surface of the frame 12 on one side, and the clutch mechanism 30 is engaged against the force of the spring 35 by the solenoid 38 during energization. On the other hand, as shown in FIG. 9, a sheave portion 14 is provided between the facing surfaces of the second gear 9 and the third gear 33, and a wire 15 is wound around the sheave portion 14 to end the wire 15. The portion is fixed on the second gear 9 at the cutout portion 34 of the third gear 33. This wire 15 is connected to a closing means for forcibly operating the spherical valve body 2 from the open state to the closed state, as shown in FIG.

Since this forced closing means has the same structure except that the first spring 18 is not provided in the above embodiment, the same reference numerals are given and the description thereof is omitted. The other valve structures are also the same as those in the above-mentioned embodiment, and the same members are designated by the same reference numerals and the description thereof is omitted.

The operation of the ball valve opening / closing device configured as described above will be described below.
In the valve open state communicating with the flow ports 1b, 1b of
As shown in FIG. 11, a fan-shaped spherical valve body first rotating gear 6
Is a state in which the center side of the cutout portion 7a is directed to the driven pinion 31 side, and the pin body 10 of the second gear 9 for operating the cam member is engaged with the locking piece 8 from the counterclockwise side. ing. Further, since the solenoid 38 is energized, the clutch mechanism 30 is engaged, and the clockwise end of the notch 34 of the third gear 33 is at a position disengaged from the drive pinion 13. On the other hand, the wire 15 is rewound around the sheave portion 14, and the piston body 17 is retracted against the force of the spring 19 through the guide sheave 21 and the intermediate sheave 23 to compress the spring 19.

From this state, when the torque motor 11 is operated to rotate the drive pinion 13 in the counterclockwise direction, the driven pinion 31 rotates integrally via the clutch mechanism 30 and meshes with the driven pinion 31. The second gear 9 rotating in the clockwise direction and the first gear 6 also integrally rotate in the same direction with the locking piece 8 engaged with the pin body 10 of the second gear 9 via the idle pinion 32. Move. As in the above embodiment, the valve rod 5 is integrally rotated by the rotation of the first gear 6, and the spherical valve body 2 is rotated in the same direction via the cam member 4 fixed to the lower end thereof. At this time, since the second gear 9 also integrally rotates as described above, the screw cylinder 6a fixed to the center of the second gear 9 and the valve rod 5 in which the screw cylinder 6a is screwed are integrally rotated. Therefore, the valve rod 5 is not moved up and down by the second gear 9.

When the first and second gears 6 and 9 are rotated clockwise by an angle of 90 degrees, the third gear integrated with the second gear 9 is rotated.
The gear 33 also integrally rotates by the same angle, and as shown in FIG.
The cutout portion 7a of the first gear 6 reaches the idle pinion 32 and is disengaged from the idle pinion 32, and further clockwise rotation is disabled, while the third gear 33 meshes with the drive pinion 13. It will be in the state where it has begun. Therefore, the first gear 6
By 90 degrees, the spherical valve body 2 rotates through the cam member 4 by the same angle, and the auxiliary valve plates 3 and 3 arranged on the closing surface side of the spherical valve body 2 are closed by the valve box. It is in a state of facing the circulation ports 1b, 1b of 1.

On the other hand, the third gear meshed with the drive pinion 13
The first gear 33 is rotated clockwise by the rotation of the drive pinion 13 and the second gear 9 stops the pin body 10 thereof.
The valve rod 5 which is further rotated in the same direction while being separated from the locking piece 8 of the gear 6 and which is screwed to the screw cylinder 9a by the rotation of the screw cylinder 9a fixed to the second gear 9. The valve rod 5 is pushed down via the screw portion 5a. By pushing down the valve rod 5, the cam member 4 integrally fixed to the lower end of the valve rod 5 moves downward, and by this downward movement, the cam surfaces 4b, 4b of the cam member 4 are attached to the rear surfaces of the auxiliary valve plates 3, 3. The protrusion 3a rides up, the auxiliary valve plates 3 and 3 are pushed toward the side of the flow ports 1b and 1b and pressed against the valve seats 1c and 1c to completely close the flow ports 1b and 1b.

On the other hand, when both gears 6 and 9 rotate integrally from the open state of the spherical valve body 2 to the position where the sub valve plates 3 and 3 face the flow port 1b of the valve box 1 as described above, 2 gears 9
A wire 15 whose one end is wound around a sheave 14 that rotates integrally with the cylinder 15 is drawn while the wire 15 is tensioned by the elastic force of 19 in accordance with the amount of the wire 15 pulled out.
The piston body 17 in 16 advances. And the piston body
When 17 reaches the position of the limit switch 26 and comes into contact with the limit switch 26, the auxiliary valve plates 3 and 3 are connected to the flow port 1b,
When 1b is completely closed, the limit switch 26 is activated by the abutment of the piston body 17 to send an electric signal to the torque motor 11, stop the rotation of the drive pinion 13, and open the clutch mechanism 30. This drive pinion 13
Also stops rotation of the second and third gears 9 and 33,
The state shown in FIG. 13 is obtained.

Next, to change from this closed state to the open state,
When the torque motor 11 is operated to rotate the drive pinion 13 in the opposite direction and the clutch mechanism 30 is closed, the second and third gears 9 and 33 are integrally rotated counterclockwise, and the second gear 9 is rotated. The rotation causes the valve rod 5 to move upward similarly to the above-described embodiment, and the cam member 4 integrated with the valve rod 5 moves upward, so that the engagement state between the cam surface 4b and the projection 3a of the sub valve plate 3 is released. As a result, the pressure force of the auxiliary valve plate 3 to the valve seat 1c is released. On the other hand, the sheave portion 14 integrated with the second gear 9 also rotates in the same direction as the second gear 9 to rewind the wire 15 against the force of the spring 19 and retract the piston body 17 from the limit switch 26 side. , Compress the spring 19.

When the second gear 9 rotates counterclockwise until the pressure of the auxiliary valve plate 3 against the valve seat 1c is released,
The pin body 10 projecting from the second gear 9 reaches a position where it comes into contact with the locking piece 8 of the first gear 6 as shown in FIG. Then, when the second gear 9 is further rotated in the same direction by the rotation of the drive pinion 13 from this state, the locking piece 8 is pushed forward by the pin body 10 and the first gear 6 having the locking piece 8 is pushed.
Rotate in the same direction to mesh with the idle pinion 32, and the gears 6 and 9 integrally rotate in the counterclockwise direction through the idle pinion 32 to rotate the valve rod 5 and The spherical valve body 2 is rotated 90 degrees through the cam member 4 fixed to the lower end to communicate the flow hole 2a with the flow port 1b, and the open state is obtained. During this operation, the sheave 14 also integrally rotates to rewind the wire 15 while compressing the spring 19, and the third gear 33 disengages from the drive pinion 13 to drive one end of the notch 34. It is in a state of facing the pinion 13.

Next, the spherical valve body 2 is thus provided with its flow hole.
In the state where the fluid such as gas is circulated by communicating 2a with the circulation port 1b, in the event of a power failure due to an earthquake or fire, the solenoid 38 is de-energized and the force of the spring 35 causes the driven pinion 31 to move. Is pushed down,
The clutch mechanism 30 is released and the connection with the drive pinion 13 is released as shown in FIG. On the other hand, since the turning force in the clockwise direction by the spring 19 on the side of the forced closing means acts on the sheave portion 14 integrated with the second gear 9 through the wire 15,
Simultaneously with the opening of the clutch mechanism 30, the second gear 9 is rotated clockwise from the state shown in FIG. 14 integrally with the first gear 6 and the third gear 33 to perform a spherical operation with the same operation as when the valve is closed. The valve body 2 is rotated in the closing direction.

At this time, when the first gear 6 is rotated 90 degrees in the clockwise direction, the notch 7a reaches the idle pinion 32 and further rotation is impossible, and it is arranged on the closing surface side of the spherical valve body 2. While the auxiliary valve plates 3 and 3 are installed to stop by rotating the valve shaft 5 to a state where they are opposed to the flow ports 1b and 1b of the valve box 1, the second gear 9 is further moved by the restoring force of the spring 19 to make the timepiece. The valve rod 5 is gradually moved downward through the screw portion 5a of the valve rod 5 which is rotated in the direction and screwed into the screw cylinder 9a of the second gear 9, and the valve rod 5 is moved by the same action as described above. The cam member 4 fixed to the lower end of the valve is integrally moved downward so that the cam surface 4a has a protrusion 3a on the auxiliary valve plate 3,3.
The sub valve plates 3 and 3 are pressed against the valve seat 1c of the flow port 1b of the valve box 1 to close the flow port 1b.

On the other hand, the third gear 33 rotates clockwise together with the second gear 9, but moves with the notch 34 facing the drive pinion 13 and turns 90 degrees. Drive pinion 13 is not engaged until it
Since it is not affected by the moment of inertia of the side, the restoring force of the spring 19 causes the first and second gears 6 and 9 to swiftly rotate to the closed position, so that the spherical valve body 2 closes the flow port 1b. It can be done.

[0048]

As described above, according to the ball valve opening / closing device of the present invention, the first motor and the second gear are rotated by the torque motor through the pinion, whereby the rotation of the first gear is controlled by the spherical valve. This spherical valve body can be automatically rotated in the opening / closing direction by transmitting it to the body, and when the auxiliary valve plate provided on the spherical valve body faces the flow port of the valve box, The notch provided in the first gear is opposed to the pinion to disengage the first gear from the pinion, and only the second gear can be rotated by the pinion, and the rotation is transmitted to the valve rod as lower power. Then, the cam member integrated with the valve rod can be moved downward to firmly and firmly press the auxiliary valve plate onto the valve seat of the flow port to close the flow port.

Further, a wire sheave is fixed to the second gear, and the other end of the wire whose one end is wound around this wire sheave is connected to a piston body in a cylinder installed outside the valve box,
Since the piston body is constantly elastically pressed by the spring to urge the sheave to rotate in one direction via the wire, the flow hole of the spherical valve body communicates with the flow port of the valve box to flow gas or the like. In the state of being
The gear can be urged in the direction of closing the spherical valve body together with the second gear via the pinion. From this state, if there is a power failure due to an earthquake or fire, the spring force will automatically By rotating the first and second gears, the spherical valve body can be quickly rotated so that the auxiliary valve plate faces the flow port, and from this state, only the second gear is rotated by the spring force. As described above, the cam member can be moved downward and the sub-valve plate can be crimped to the valve seat to automatically close it.In an emergency such as an earthquake, the valve can be immediately closed without human intervention and gas explosion, etc. It is possible to prevent the occurrence of the above, and it can be used as a safety valve for the benefit.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view of a device of the present invention,

FIG. 2 is a cross-sectional view of the spherical valve portion,

FIG. 3 is a simplified rear view of the entire device,

FIG. 4 is a simplified side view thereof,

FIG. 5 is a cross-sectional view of the forced closing means,

FIG. 6 is a simplified plan view showing the relationship between the first and second gears and the pinion in the valve open state,

FIG. 7 is a simplified plan view showing a relationship between both gears and a pinion for explaining a valve closing operation.

FIG. 8 is a vertical sectional front view showing another embodiment of the device of the present invention,

9 is a simplified perspective view of second and third gear portions, FIG.

FIG. 10 is a cross-sectional view of the forced closing means,

FIG. 11 is a development plan view showing the relationship between the first to third gears and the pinion in the valve open state,

FIG. 12 is a developed plan view of the first to third gears rotated 90 degrees in the closing direction,

FIG. 13 is a developed plan view showing the relationship between the gear and the pinion in the closed state,

FIG. 14 is a developed plan view for explaining the valve closing action in an emergency.

[Explanation of symbols]

 1 valve box 1b flow port 1c valve seat 2 spherical valve body 2a flow hole 3 auxiliary valve plate 4 cam member 5 valve rod 6 first gear 7 notch 8 locking piece 9 second gear 10 pin body 11 torque motor 13 pinion 14 Sheave 15 Wire 16 Cylinder 17 Piston body 18 1st spring 19 2nd spring

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Masao Hattori 507-2 Shintakaracho, Tokai City Toho Gas Co., Ltd. Research Institute (72) Inventor Ryo Sakai 507-2 Shintakaracho, Tokai City Toho Gas Co., Ltd. In-house (72) Takashi Moriyama, Shinjuku-ku, Tokyo 3-7-1, Shinjuku Park Shinjuku Park Tower 27th Floor Tokyo Gas Co., Ltd. (72) Inventor Hisayoshi Takita 3-7-1, Shinjuku-ku, Tokyo Shinjuku Park Tower Shinjuku Park Tower 27th floor Within Tokyo Gas Co., Ltd. (72) Inventor Tatsuo Kume 3-295 Chiyosaki, Nishi-ku, Osaka City Osaka Gas Co., Ltd. (72) Hirohiro Ogura 5-1161 Toroshima, Konohana-ku, Osaka Osaka Inside Gas Co., Ltd. (72) Inventor Toshimitsu Takamatsu 2-9-22 Shinji, Higashinari-ku, Osaka Within Mutsumi Kosei Co., Ltd. (72) Inventor Noritaka Takamatsu Osaka Higashinari Ward felt 2-chome No. 9 No. 22 stock companies Mutsumi in the Kosei

Claims (4)

[Claims] 1. A spherical valve body is rotatably mounted in a valve box having a flow port, and the spherical valve body is provided with a flow hole capable of communicating with the flow port, and on the surface side which closes the flow port. A recess is formed and a sub valve plate is disposed in the recess so that it can come into contact with and separate from the valve seat of the flow port, and a cam member is vertically movable in the spherical valve body on the back side of the sub valve plate. In a ball valve configured such that the cam surface of the cam member and a protrusion protruding from the back surface of the sub valve plate are brought into pressure contact with the sub valve plate against the valve seat, the ball valve is arranged outside the valve box. The operation of the torque motor causes the spherical valve element to rotate in the opening / closing direction to perform an operation of communicating the flow hole of the spherical valve element with the flow port side of the valve box and an operation of causing the auxiliary valve plate to face the valve seat. The spherical valve element operating means and the torque motor actuate the cam member to disable the spherical valve element operating means. Cam member actuating means for moving the sub valve body facing the valve seat up and down to attach and detach to and from the valve seat, and actuating the spherical valve element actuating means and the cam member actuating means from the open state of the spherical valve body at the time of power failure. An opening / closing device for a ball valve, comprising: a sub-valve plate of the spherical valve body facing the valve seat, and then forcibly closing the valve seat against the valve seat. 2. The first gear having the spherical valve element actuating means, wherein the lower end of the valve rod is fixed to the central portion of the upper end surface of a cam member provided on the spherical valve body, and the pinion is meshed with the upper end portion of the valve rod. And an engaging piece projecting from the first gear and a notch provided in the first gear. The cam member actuating means includes a screw cylinder on the inner peripheral surface of the second gear. And the screw cylinder is screwed into a screw portion provided on the upper end of the valve rod, and a pin body for engaging and disengaging the engaging piece of the first gear is projectingly provided on the second gear. When the cutout portion of the first gear is located at the pinion and its tooth portion is out of the pinion, the torque motor is operated through the pinion.
By transmitting only to the gear and reciprocally rotating the second gear within a rotation range in which the pin body does not engage with the engaging piece of the first gear, the valve rod is moved up and down to circulate the sub valve plate. The spherical valve element is opened and closed by attaching and detaching the spherical valve element to and from the valve seat of the mouth, and causing the pin body to collide with the engaging piece to integrally reciprocally rotate the first gear and the second gear via the pinion. 2. The ball valve opening / closing device according to claim 1, wherein the ball valve opening / closing device is configured to rotate in a direction. 3. The force closing means secures a wire sheave to the second gear, and connects the other end of the wire having one end wound around the wire sheave to a piston body in a cylinder installed outside the valve box. The ball valve opening / closing device according to claim 1 or 2, wherein the body is constantly elastically pressed by a spring to urge the sheave to rotate in one direction via a wire. 4. A first gear and a second gear are integrally provided with a third gear having a notch in a part thereof, and a main driving pinion meshed with the third gear is fixed to a rotary shaft of a torque motor. The drive pinion is connected to the driven pinion through the clutch mechanism, the driven pinion is meshed with the second gear, and the first and second gears are meshed with the idle pinion, and the clutch is normally engaged. In this state, the first and second gears are rotated by rotating the driven pinion from the main pinion through the clutch mechanism by the rotation of the torque motor, thereby opening and closing the spherical valve body and rotating only the second gear. The cam member is actuated, the clutch mechanism is opened to disconnect the torque motor and the driven pinion at the time of a power failure, and the first and second gears are operated by the spring force of the forced closing means. The auxiliary valve plate of the spherical valve body is rotated to face the valve seat, and is then crimped to the valve seat.
4. The ball according to claim 1, wherein the third gear that rotates integrally with the second gear is configured not to mesh with the driving pinion through the notch. Valve opening / closing device.