JPS58604A - Actuator - Google Patents

Abstract

PURPOSE:To operate an actuator without using a speed change mechanism, by introducing and discharging fluid pressure into and out of cylindrical chambers curved as an arc. CONSTITUTION:When a pressurized fluid is introduced into a chamber 16 of a cylinder 7 curved as an arc and is discharged out of its other chamber 17, a piston 10 slides counterclockwise and an operating rod 13 is rotated in the same direction with a connecting rod 21 and an annular part 24. Because of the rotation of the spindle of a valve unit 1, its valve element is turned to an opened or closed position. When the piston 10 has come into contact with the protrusion 20 of the cylinder 7, the piston, the operating rod 13, the connecting rod 21 and the annular part 24 stop moving. Since the spindle of the valve unit 1 receives the force through the connecting rod 21, a movement direction change mechanism is not needed. This results in simplifying the structure of an actuator.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an actuator used for operating rotary valves such as ball valves and butterfly valves.

Rotary pulp is operated using a piston-cylinder type actuator that performs linear reciprocating motion, or a rotary vane-type actuator that performs reciprocating rotation within a cylindrical cylinder with a rotating shaft that has pressure-receiving vanes. was. 2 Piston-cylinder type actuators require conversion mechanisms such as cams and gears to convert linear motion into rotational motion, resulting in a complex structure and large transmission loss. However, with rotary vane type actuators, it was difficult to seal the pressure receiving vanes, the cylinder chamber wall, and the rotating shaft, resulting in a complicated seal structure and the resistance of this seal part was large.

The present invention is an actuator of the piston-type reader/actuator, which outputs reciprocating rotational motion, does not require a conversion mechanism such as a cam or gear, has a simple seal structure, and has low resistance in this part. With the goal.

The present invention aims to achieve this objective by providing a cylinder member having an arcuate cylindrical wall and an end wall that closes an end opening of the cylindrical wall, which is fixed to a valve casing on the side to be operated, etc. A piston member arranged to move Δ relative to
An operating rod that airtightly penetrates the end wall of a cylinder member and is connected to a piston member, which bends in an arc concentrically with the cylindrical wall of the cylinder member and performs reciprocating rotational movement in conjunction with the piston member. A connecting rod that extends from the rod in the inner diameter direction and connects to the valve shaft of the operated valve, which is rotated and formed by the cylindrical wall and end wall of the cylinder member and the piston member. This is accomplished by an actuator that operates by introducing and discharging fluid pressure into a chamber.

Next, the present invention will be explained based on illustrated embodiments. 1st
In the figure, 1 is the pulse of the Borl valve, butterfly valve, etc. The member 3 is attached to the gland portion 2 of the valve 1 by tightening the bolt 4. For installation, the member 3 is provided with heat radiation fins 5 to prevent heat transfer from the valve 1 side. For attachment, the member 3 is connected to the cylinder member 7 via the arm portion 6.

As shown in FIG. 2, the cylinder member 7 is made of a cylindrical wall 8 concentrically curved in an arc shape with the valve shaft of the valve 1, and an end wall 9 that closes openings at both ends of the cylindrical wall 8. /A cylinder chamber is formed in the ring member 7, and a piston 10 is disposed therein. The outer periphery of the piston 10 is configured to slide airtightly within the cylindrical wall 8 with an annular member 11 interposed therebetween. The piston 10 is the cylinder member 7
The end wall 9 of the holder is connected to an operating rod 13 which passes through the end wall 9 in an airtight manner via a 7-round member 12. The operating rod 13 is bent into an arc shape around the valve stem of the valve l. Furthermore, when assembling the piston member 7, it is divided into two circular arcs to the left and right of the line shown in FIG. The end wall 9 of the cylinder member 7 is provided with an outwardly protruding protrusion 14, and a liner 15 for slidingly guiding the operating rod 13 is attached to this protrusion 14. . The liner 15 uses a dry bearing or the like.

Chambers 16 and 17 are provided on the left and right sides of the piston 11, and pressure fluid is introduced and discharged alternately into the chambers 16 and 17 through through holes 18 and 19. On the inside of the end wall 9 of the cylinder member 7 is a projection 20 for a stopper that determines the sliding range of the piston 10.
will be established. This regulation range is a range in which the valve shaft of valve l can be rotated by 90 degrees. The operating rod 13 is made integrally with a connecting rod 21 extending in the inner diameter direction. The inner diameter end of the connecting rod 21 is formed into a ring shape having a substantially square hole 22. The hole 22 of this ring-shaped portion 24 fits into the square column portion 23 of the valve shaft of the valve 1.

The ring-shaped portion 24 is fixed with a Nand 26 screwed onto the tip 25 of the valve stem. Slide rings 27 and 28 are interposed between the ring-shaped portion 24 and the NAND 26 and the mounting member 30 to reduce resistance during rotation.

29 is a reinforcing rib, and 30 is a gasket.

The operation of the above embodiment will be explained. Chamber 16 of cylinder member 7
When introducing pressure fluid into the chamber 17 and discharging the pressure fluid within the chamber 17, the piston 10 slides counterclockwise. The operating rod 13 is driven counterclockwise like the piston 10, and the connecting rod 2
1 and the ring-shaped portion 24 to rotate the valve shaft.

The valve body within the valve 1 is rotated to an open or closed position by rotation of the valve shaft. When the piston 10 comes into contact with the protrusion 20 of the cylinder member 7, the displacement of the piston 10, the operating rod 13, and the connecting rod 2111J ring-shaped portion 24 stops.

Next, when the pressure fluid in the chamber 16 is discharged and the pressure fluid is introduced into the chamber 17, the piston 10. Operating rod 13, connecting rod 21
and the ring-shaped portion 24 rotates clockwise, causing the valve l
Rotate the valve stem clockwise. This rotation is piston 1
0 continues until it abuts against the protrusion 20, at which point the valve body of the valve 1 reaches the next closed or opened position. In this way, by alternately introducing and discharging the pressure fluid into the chambers 16 and 17 of the cylinder member 7, the present actuator opens and closes the valve l. The through hole 18.]-9 of the cylinder member 7 is the chamber 16.
In order to control the pressure of No. 17, it is preferable to connect it to a pressure fluid source via a four-way switching valve or the like.

In this embodiment, the piston 10 reciprocates in an arc shape within the cylinder member 7, and this movement is output to the valve shaft of the valve 1 via the operating rod 13 and the connecting rod 21, so no mechanism for converting the direction of movement is required. , the structure of the actuator becomes simple. The sealing portions are only between the outer periphery of the biston 10 and the cylindrical wall 8 of the cylinder member 7, and between the outer periphery of the operating rod 13 and the end wall 9 of the cylinder member 7, and are easy to seal. Furthermore, the resistance of the seal portion is also reduced. The part consisting of the piston 10 and cylinder member 7 is arranged concentrically with the valve shaft of the valve l;
: Since the piston 10 is separated from the valve shaft of the valve 1, the fluid pressure acting on the piston 10 is expanded according to this distance, and can be outputted to the valve shaft as a large force.

A liner 15 is disposed on the end wall 9 of the cylinder member 7 and guides the operating rod 13, so that the operating rod 13 is unlikely to get caught.

In the above embodiment, a single piston was used, but for example, a plurality of pistons and cylinders could be arranged symmetrically around the valve shaft and connected to the operating rod.・It is also possible to expand the operating power of Lube.

Furthermore, the pressure fluid was introduced and discharged into the chambers on both sides of the piston, but the pressure fluid was introduced and discharged only into one chamber, and a spring was placed in the other chamber, so that the operation was performed using a spring return method. The configuration can also be simplified. Also,
The piston is configured to perform circular arc-shaped reciprocating motion within a 90 degree range by means of a protrusion within the cylinder member, but this restricted range can be changed depending on the type and application of the valve. Furthermore, this actuator can also be used for rotational operations other than rotary valves.

The present invention);L Thus, although it is a piston-cylinder type actuator, it is possible to provide an actuator with a simple structure that outputs reciprocating rotational motion and does not require a movement direction conversion mechanism such as a cam gear. Furthermore, it is possible to provide an actuator that has a simple seal structure with a small number of sealing parts and low resistance in this part.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an actuator according to an embodiment of the present invention attached to a valve, and FIG. 2 is a partially omitted sectional view taken along line BB in FIG. 1. 1: Valve, 3: Mounting member, 7: Cylinder member, 8: Cylinder wall, 9: End wall, 1o: Piston,
] 3: Operation rod, 15: Liner, 18/19
: Through hole, O: Protrusion for stopper, 21: Connecting rod. Patent applicant Thielve Co., Ltd. Representative Katsuji Fujiwara

Claims (1)

[Claims] 1. A cylinder member having a cylinder wall bent in an arc shape and an end wall that closes an opening at the end of the cylinder wall, which is fixed to a valve ring, etc. on the operated side, and which slides airtightly inside the cylinder member. A piston member arranged in the piston member, an operating rod connected to the piston member by passing through the end wall of the cylinder member in an airtight manner, which curves in an arc concentrically with the cylindrical wall of the cylinder member, and reciprocates in conjunction with the piston/member. It consists of a connecting rod that performs rotational movement, a connecting rod that extends in the inner diameter direction from the operating rod and connects to the valve shaft of the pulp on the operated side, and that rotates the valve shaft. An actuator that operates by introducing and discharging fluid pressure into a chamber formed by a wall and a piston member.