JPH0712783Y2 - Valve actuator - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve actuator capable of switching between opening and closing of a sluice valve and a stop valve by both automatic operation and manual operation.

[0002]

2. Description of the Related Art In a sluice valve of this type, a valve element arranged orthogonal to a flow path and a valve rod connected to the valve element are moved up and down by an actuator to open and close the flow path. The valve stem is automatically operated at all times and manually operated in an emergency or the like. The conventional opening / closing structure of the sluice valve will be described with reference to FIGS. 8 and 9, for example, and is composed of a valve structure part 1, a connecting part 2, an automatic operating part 3 and a manual operating part 4. In the valve structure 1, a disc-shaped valve body 6 arranged in a valve body 5 in a direction orthogonal to a flow path is connected to a lower end of a valve rod and slides along a disk 8 by vertical movement of the valve rod. It is movably attached. This valve rod is integrally connected to the screw rod 7 extending into the automatic operation unit 3, the shaft 9 into which the upper end side of the screw rod 7 is inserted, and the upper end of the shaft 9 in the automatic operation unit 3. It is composed of a shaft 10 protruding toward the manual operation part 4 side.

The connecting portion 2 is screwed to the upper flange 11 having an inner screw threaded to an outer screw thread provided on the lower end side of the shaft 9 and the flange 11 by inserting the screw rod 7. A lower flange 12 and a positioning nut 13 screwed onto the screw rod 7 for joining the screw rod 7 and the shaft 9 via the upper flange 11 and the lower flange 12 while adjusting the relative positions thereof. There is. The automatic operation unit 3 is a cylinder provided with a partition wall 14.
A main body 15 and a lower piston 16 and an upper piston 17 housed in the cylinder-main body 15 are provided. The lower side piston 16 has an inner diameter slightly larger than the outer diameter of the shaft 9, an outer peripheral surface of which slides along the partition wall 14, and an outer peripheral surface of the cylinder-body 15
Is integrally formed with a flange portion that slides along the inner peripheral surface of the first air chamber 18 below the lower piston 16.
However, breathing chambers 19 are formed on the upper side. The upper piston 17 has a disk-shaped inner peripheral surface that abuts the outer peripheral surface of the shaft 10 in a sealed state, and an outer peripheral surface that slides along the inner peripheral surface of the cylinder body 15. A split ring 21 provided on the outer peripheral surface of the shaft 10 is mounted between the inner peripheral side of the upper piston 17 and a piston receiver 20 integrally mounted on the lower surface of the upper piston 17.
7 and the shaft 10 are configured to work together,
A second air chamber 22 is formed on the lower side of the upper piston 17, and a third air chamber 23 is formed on the upper side. The first air chamber 1
8 communicates with the external air pressure source circuit via the pressure inlet / outlet 24 and the second air chamber 23 via the pressure inlet / outlet 25, and the first air chamber 18 extends between the shaft 9 and the lower piston 16. And communicates with the second air chamber 22 via a passage provided in the. The breathing chamber 19 communicates with the atmosphere through a breathing hole 26, and is designated by reference numerals 27a and 27b.
Are lower and upper lids attached to the cylinder body 15. The manual operation part 4 includes an upper lid 2 of the cylinder.
It has a yoke 28 bolted to 7b, and the yoke 2
8 includes a whirl-stop plate 29 and a yoke stem 30 formed by a screw rod whose lower end is pinned to the whirl-stop plate 29 and whose upper end projects above the yoke 28. A handle 32 is attached to the via a nut 31. The screw nut on the upper end side of the shaft 10 projectingly provided in the yoke 28 is screwed with an adjust nut 33 and a lock nut 34, respectively. The yoke stem 30 is inserted through a manual operation pin 35 that is inserted into a stop hole formed in the
Connected with. Incidentally, reference numeral 39 is an indicator.

In the sluice valve having the above construction, the manual operation pin 35 is pulled out at the time of automatic operation, and the shaft 10 which constitutes a part of the valve rod and the yaw which constitutes a part of the manual operation part 4.
With the system 30 separated, the automatic operation unit 3 is operated to move the valve rod up and down, thereby opening and closing the flow path of the valve structure unit 1. That is, when the air pressure is supplied from the inlet / outlet 24 into the first air chamber 18 during the valve opening operation, the lower piston 16 is pushed up and at the same time, the air pressure is also supplied to the communicating second air chamber 22, and the upper piston 17 also. Pushed up. After that, the lower piston 16 comes into contact with the partition wall 14 and its ascending is stopped, but the upper piston 17 continues to ascend with half the force of the initial movement. As the upper piston 17 is lifted, the valve rod including the shaft 10 is lifted via the stop ring 21 engaged with the upper piston 17, so that the valve body 6 is pulled up from the flow path and the flow path is opened to open. When the valve is completed, the upper piston 1
The ascent of 7 is stopped. Further, when the air pressure is supplied from the inlet / outlet port 25 into the third air chamber 23 during the valve closing operation, the upper piston 17 is pushed down so that the residual air in the second air chamber 22 passes through the first air chamber 18 and the inlet / outlet port 24. After the piston receiver 20 attached to the upper side piston 17 contacts the upper end of the cylindrical portion of the lower side piston 16, the upper side piston 17 and the lower side piston 16 are simultaneously discharged at a lower descent speed. While descending, the valve rod is pulled down and the valve is closed.

Further, in the case of manual operation, the pin 35 is used.
The shaft 10 forming a part of the valve stem and the yoke stem 30 interlocking with the handle 32 are integrally connected by the insertion of the valve stem, and the valve stem and the valve body 6 are rotated by rotating the handle 32.
Can be moved up and down to open or close the valve. This switching operation will be described in detail with reference to FIGS. 10 (A) and 10 (B). First, when switching from manual to automatic, the pin 35 is pulled out to separate the shaft 10 and the yoke stem 30, and the handle 32 is turned to rotate the yoke stem 30.
And the detent 29 is pulled up to the top that does not get in the way. When switching from automatic to manual, the handle 32 is turned to pull down the yoke stem 30 and the detent 29, and the shaft 10 is pulled up to the uppermost position so that the shaft 10 has a hole 10a and the detent 29 has a hole 29a. Then, the pin 35 is inserted in a state where they are aligned with each other, and the tightness of the valve body 6 is adjusted by the lock nut 34 and the adjustment nut 33 so that the valve does not have a leak.

[0006]

However, the structure of the valve actuator as in the conventional example described above has the following problems. (1) Due to the configuration in which the automatic operation unit and the manual operation unit are difficult to separate, for example, when the automatic operation unit fails, it must be stopped and repaired. (2) Since the switching operation between automatic and manual is complicated and the operation must be performed at the top, there is a difficulty in safety and speed. Therefore, the present invention provides a valve actuator for solving these problems.

[0007]

A valve actuator of the present invention has a valve rod connected to a valve body of a valve structure disposed orthogonally to a flow path and provided with a valve rod protruding upward, and the valve rod is automatically operated. Alternatively, in a valve such as a sluice valve or a stop valve that is moved up and down by a manual operation part to open and close, the valve rod has a pipe-shaped manual operation valve rod provided with a screw on the outer periphery and an automatic operation valve rod Arranged concentrically in a penetrating manner, the manual operating valve rod and the automatic operating valve rod are connected to each other during manual operation, and have a switchable connecting portion that is separated during automatic operation, The manual operation part is located below the automatic operation part, and is a gear box that accommodates a driven gear that is screwed onto an outer peripheral screw of the manual operation valve rod and a main drive gear that interlocks the driven gear. And one end of the rotation shaft of the main drive gear is on the side of the gear box. And a cylinder body concentrically arranged on the outer periphery of the upper portion of the valve rod for automatic operation, and the outer peripheral surface is an inner periphery of the cylinder body. A piston that is detachably attached to the upper end of the automatic operation valve rod in a state of slidingly contacting the surface and divides the inside of the cylinder body into upper and lower air chambers, and stands up from the gear box for automatic operation. The cylinder body is separated from the gear box in a manner that it is concentrically arranged on the outer periphery of the upper portion of the valve rod, and the outer periphery of the valve rod for automatic operation slides in sealing contact with the inner peripheral surface of the upper end portion. The fluid cylinder is provided with a partition wall, and an annular gap into which the upper side of the manual operation valve rod can be inserted is provided between the partition wall and the outer circumference of the automatic operation valve rod.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS. 2 and 3, the valve structure portion 51, the connection portion 52, the manual operation portion 53, and the automatic operation portion 54 are included. The valve structure portion 51 is similar to the case of the above-described conventional example, and the disc-shaped valve body 56 arranged in the valve body 55 orthogonally to the flow path constitutes a part of the valve rod. It is configured to be connected to the lower end of the screw rod 57 and slide along the disk 58 by the vertical movement of the valve rod to open or close the valve. The valve rod has a screw rod 57 whose upper end extends into the manual operation portion 53, a hollow pipe 59 into which the screw rod 57 is inserted, and a shaft 60 integrally joined to the upper end of the hollow pipe 59. It is composed of a slide pipe 61 through which the hollow pipe 59 is inserted.

As shown in FIGS. 4 and 5, the connecting portion 52 is cylindrical and has an inner screw threaded on the inner circumferential surface on the upper side to be screwed into the outer circumferential thread on the lower end portion of the slide pipe 61. A coupler in which a fan-shaped groove 62a is formed below
62, and a circular strip-shaped flange 63a fitted to the fan-shaped groove 62a on the outer periphery on the upper side, and a circular strip-shaped flange 63b having a smaller diameter than the flange 63a on the outer periphery on the lower side. A rotor 63 having an inner screw threaded to the outer peripheral thread of the lower end portion of the hollow pipe 59, and a switching lever 63c projectingly provided on the outer periphery of the intermediate portion, and the rotor 6
A pressing ring 64 fitted to the outer periphery of the flange 63b on the lower side of 3, and a flange 65 that is bolted to the pressing ring 64 and rotatably holds the rotor 63 between the pressing ring 64 and the pressing ring 64. , The pointer 6 between the flange 65
The lock nut 67 is screwed to the screw rod 57 so as to hold 6 in position.

When the connecting portion 52 is manually operated, as shown in FIG. 4, via the coupler 62, the rotor 63, the holding ring 64, the flange 65, and the lock nut 67,
Screw rod 57, hollow pipe 69 and slide pipe 61
When the slide pipe 61 is moved up and down by the manual operation part 53, the screw rod 57 and the hollow pipe 59 are also moved up and down to manually operate the on-off valve. Further, during automatic operation, the switching lever 63c is operated to rotate the rotor 63 by 90 degrees to release the engagement between the rotor 63 and the coupler 62 as shown in FIG. The hollow pipe 59, which constitutes the valve rod for automatic operation, which is separated from the slide pipe 61 which constitutes the valve rod for manual operation, is moved up and down by the automatic operating portion 54, so that the screw rod 57 also moves up and down. It operates so that it operates automatically.

As shown in FIG. 1, FIG. 6 and FIG. 7, the manual operating portion 53 is composed of a gear box, and the valve rod is arranged in the center of the case 68 of the gear box. The threaded rod 57, the hollow pipe 59, and the slide pipe 61 are inserted concentrically.
The inner teeth of the driven spiral gear 69 are meshed with the outer peripheral threads of the spiral gear 69, and the spiral gear 69 passes through the bush 70, the slide key 71 and the support block 72, and
It is held at 8. The external spiral teeth of the driven spiral gear 69 have a driving spiral gear 7 with a gear ratio of 2: 1.
3 is meshed with the spiral gear 73, and one end of the gear shaft 74 to which the spiral gear 73 is fixed is protruded to the outside of the case 68 of the gear box to manually operate the handle 75.
Are linked to. Handle 75 of the manual operation part 53
When is rotated, the rotational force is applied to the slide pipe 61 through the main spiral gear 73 and the driven spiral gear 69.
Is transmitted to the slide pipe 61 to move up and down, and the valve body 56 is operated via the connecting portion 52 to open and close the valve.

As shown in FIGS. 1 to 3, the automatic operation section 54 has a partition wall 77 for partitioning the interior of the cylinder body 76 from the gear box 68, and a partition wall 78 for partitioning the cylinder chamber. A lower piston 79 and an upper piston 80 are provided. The partition wall 77 prevents air pressure from flowing into the gear box side and minimizes air pressure consumption, and the shaft 60 can slide on a part of the inner end of the partition wall 77. As described above, the space 81 is provided between the partition wall 77 and the valve rod (slide pipe 59 and shaft 60) so that the hollow pipe 61 can move up and down. The lower piston 79 has a cylindrical shape with a flange, and an outer end of the flange side is slidable with the cylinder body 76, and an air pressure is supplied from an inlet / outlet 82 to / from the partition wall 77. And a passage 85 for communicating the air chamber 83 with the air chamber 84 formed between the upper piston 80 and the partition wall 78 is provided between the cylindrical portion side and the partition wall 77. The partition wall 78 has an inner end abutting in a sealed state so that the outer surface of the cylindrical portion of the lower piston 79 can slide, and a breathing hole 86 is provided between the partition wall 78 and the lower piston 79.
A breathing chamber 87 is provided which communicates with the atmosphere via the.
The upper piston 84 has a disc shape, and the shaft 60
Is fixed to the upper end of the cylinder by a stop bolt 88, the outer peripheral surface of which is slidably abutted along the inner surface of the cylinder-main body 76, and the inlet / outlet port 8 is provided above the upper piston 84.
An air chamber 90 to which air pressure is supplied via 9 is provided.

In the automatic operation section 54, when the valve is opened, the lower side piston 79 is pushed up by the air pressure supplied from the inlet / outlet 82 to the air chamber 83, and at the same time, this air pressure is also supplied to the air chamber 84 through the passage 85. Therefore, the upper side piston 80 is also pushed up. Then, after the lower piston 79 comes into contact with the partition wall 78 and stops rising, only the upper piston 80 continues to lift with half the force at the time of initial movement. As a result, the valve rod including the shaft 60 connected to the upper piston 80, the slide pipe 59, the screw rod 57, and the like pulls up the valve body 56 to open the valve. still,
At this time, the hollow pipe 61 connected to the slide pipe 59 and the like is projected into the space 81. Further, during the valve closing operation, the upper piston 80 is pushed down by the air pressure supplied from the inlet / outlet 89 to the air chamber 90, and the residual air in the air chamber 84 is discharged from the inlet / outlet 82 through the passage 85 and the air chamber 83. After the side piston 80 descends to the position where it abuts the upper end of the cylindrical portion of the lower piston 79, the upper piston 80 and the lower piston 79 together descend at a slower descending speed, and the valve body 56 is closed. The valve is closed via the rod.

As described above, in the above-mentioned actuator, the hollow pipe 59, which is the valve rod for automatic operation, is always operated by the vertical drive operation of the pneumatic cylinder which constitutes the automatic operation section 54.
The shaft 60 is moved up and down, and the opening / closing valve operation is performed by the valve body 56 via the screw rod 57 screwed to the hollow pipe 59. During this automatic operation, the connecting portion 52 rotates the rotor 63 by operating the switching lever 63 to release the engagement with the coupler 62 and separate the slide rod 61 and the coupler 62 from the screw rod 57 and the hollow pipe 59. Therefore, when the handle 75 is rotated counterclockwise in this state, the slide pipe 61 and the coupler 62 ascend, and the slide pipe 61 is inserted with the upper side inserted into the gap 81 as shown in FIG. Can be stored in the manual operation part 53. When used in this way, the threaded portion engraved on the outer periphery of the hollow pipe 59 is not exposed to the outside, so malfunctions due to the adhesion of dust and the like can be prevented. In addition, as a conventional technique provided with a connecting portion capable of switching between automatic operation and manual operation,
For example, Japanese Utility Model Publication No. 38-6076 and Japanese Utility Model Publication No. 50-65.
No. 021 discloses the slide pipe 61 which is a manually operated valve rod separated from the automatic operation valve rod by releasing the connecting portion as in the present invention. There is no disclosure of the idea of storing in the annular space 81.

Further, in the event of an emergency such as when the automatic operation unit 54 is out of order or when an overhaul is performed, the automatic operation unit 54 is detached from the actuator and the manual operation unit 53 is operated by rotating the handle 75. When a certain gear box is rotationally driven and the slide pipe 61 screwed to the gear box is moved up and down, the slide pipe 6
1 through the threaded rod 57 connected by the connecting portion 52
The on-off valve operation by 6 is performed. When removing the automatic operation part 54, the upper lid of the cylinder body 76 is removed and the stop bolt 88 is once removed, and the partition 77 is left and the other cylinder bodies 76 are removed as shown in FIG. By attaching the set bolt 88 to the shaft 60, manual operation can be easily performed. As a result, the maintenance and inspection of the automatic operation unit 54 removed during that time can be performed, and the interruption of the work can be minimized. Even after the main part of the automatic operation unit 54 is removed,
Since the upper end of the partition wall 77 slidably supports the hollow pipe 59 and the shaft 60 which are the remaining automatic operation valve rods, the swinging of the screw rods 57 during the manual operation is eliminated to maintain accurate on-off valve operation. be able to. As a conventional technique in which the automatic operation part is separated from the manual operation part and can be removed, there are those disclosed in, for example, Japanese Utility Model Publication No. 38-6076 and Japanese Utility Model Publication No. 52-30593. The automatic operating unit is configured to operate a link connected to the valve rod by a crank, and the latter automatic operating unit is configured by an actuator that swings and rotates the valve rod. Therefore, the actuator is basically different from the actuator of the present invention having the above-described structure in which the pneumatic cylinder is used as the automatic operation unit 54 and the automatic operation unit 54 is easily removable.

[0016]

As is apparent from the above-mentioned embodiment, the valve actuator of the present invention has the following effects. (1) When the fluid pressure cylinder, which is the automatic operation unit, breaks down or overhauls, the valve is manually opened and closed by operating the handle of the manual operation unit even when the automatic operation unit is removed. Since it can be used continuously without stopping the operation of the entire device equipped with this valve actuator, the removed automatic operation part can be easily put down on the safe ground for repair or inspection. it can. In this case, in particular, since the upper end of the partition wall slidably supports the valve rod for automatic operation, which remains even after the main part is removed, the automatic operation part eliminates wobbling of the screw rod during manual operation and is accurate. It is possible to maintain proper on-off valve operation. (2) The connecting portion for switching between the automatic operating portion and the manual operating portion is a safe and quick one-touch operation by attaching / detaching the manual operating valve rod to / from the automatic operating valve rod by rotating the rotor. It can be carried out. In this case, the slide pipe, which is used as a manual operation valve rod and has a thread engraved on the outer periphery, is separated from the automatic operation valve rod during automatic operation. It can be stored in a state that it is inserted into an annular space 81 formed in the outer periphery on the upper side, whereby the screw portion is not exposed to the outside, and thus malfunctions due to the adhesion of dust and the like can be prevented.

[Brief description of drawings]

FIG. 1 is a sectional view of a main part of a sluice valve according to an embodiment of the present invention.

FIG. 2 is an overall front view of a sluice valve according to an embodiment of the present invention.

FIG. 3 is an overall side view of a sluice valve according to an embodiment of the present invention.

4A and 4B are a bottom view and a longitudinal sectional view of a main portion of a connecting portion when a gate valve according to an embodiment of the present invention is manually operated.

5A and 5B are a bottom view and a vertical cross-sectional view of a main portion of a connecting portion during automatic operation of a sluice valve according to an embodiment of the present invention.

FIG. 6 is a vertical cross-sectional view of a manual operation unit of a sluice valve according to an embodiment of the present invention.

FIG. 7 is a cross-sectional view of a manual operation unit of a gate valve according to an embodiment of the present invention.

FIG. 8 is an overall front view of a sluice valve according to a conventional example.

FIG. 9 is an overall side view of a sluice valve according to a conventional example.

FIG. 10 is an explanatory diagram of an automatic / manual switching operation of a sluice valve according to a conventional example.

FIG. 11 is a vertical cross-sectional view illustrating a use state of the sluice valve according to the embodiment of the present invention during automatic operation.

FIG. 12 is a cross-sectional view illustrating a usage state of a manual operation unit of the sluice valve according to an embodiment of the present invention, in which an automatic operation unit is removed.

[Explanation of symbols]

 51 valve structure part 52 connecting part 53 manual operation part (gear box) 54 automatic operation part (pneumatic cylinder) 55 valve body 56 valve body 57 screw rod 58 disk 59 hollow pipe 60 shaft 61 slide pipe 62 coupler 63 ro- Ta 64 Presser ring 65 Flange 66 Pointer 67 Lock nut 68 Case 69 Driven spiral gear 70 Bush 71 Sliding key 73 Driven spiral gear 74 Gear shaft 75 Handle 76 Cylinder body 77 Partition wall 78 Partition wall 79 Lower piston 80 Upper piston 81 Void 82,89 Doorway 83,84,90 Air chamber 85 Passage 86 Breathing hole 87 Breathing chamber 88 Stop bolt

Claims (1)

[Scope of utility model registration request] 1. An on-off valve in which a valve rod connected to a valve body of a valve structure disposed orthogonally to a flow passage is projected upward and the valve rod is vertically moved by an automatic operation unit or a manual operation unit. In a valve such as a sluice valve and a stop valve, the valve rod is concentrically arranged in such a manner that an automatic operation valve rod penetrates a pipe-shaped manual operation valve rod provided with a screw on its outer periphery, The manual operation valve rod and the automatic operation valve rod are connected to each other during the manual operation and have a switchable connecting portion which is separated during the automatic operation, and the manual operation portion is located below the automatic operation portion. A gear that accommodates a driven gear that is positioned and screwed onto the outer peripheral screw of the manually operated valve rod, and a driving gear that interlocks the driven gear
It is composed of a box, one end of the rotation shaft of the main drive gear is projected to the side of the gear box and is connected to a handle for manual operation, and the automatic operation part is the outer periphery of the upper part of the automatic operation valve rod. A cylinder body concentrically disposed with the outer peripheral surface of the cylinder body slidably in contact with the inner peripheral surface of the cylinder body is detachably attached to the upper end of the valve rod for automatic operation, A piston that is divided into upper and lower air chambers, and is erected from the gear box and concentrically arranged on the outer circumference of the upper side of the automatic operation valve rod, and the outer circumference of the automatic operation valve rod to the inner peripheral surface of the upper end side. Is a fluid cylinder provided with a partition for partitioning the inside of the cylinder body from the gear box in a sliding manner in a sealed manner, and the manually operated valve is provided between the partition and the outer circumference of the valve rod for automatic operation. The top side of the bar can be inserted Valve actuator wherein the annular gap is provided - data -.