KR101558540B1 - Hydraulic rotary actuator for opening and closing butterfly valve - Google Patents

Abstract

The present invention relates to a hydraulic rotary actuator for the opening and closing of butterfly valves, capable of improving productivity by having a constant shape of a rotary shaft regardless of various shapes of a valve shaft of butterfly valves and applying a new connection structure through a valve connection part to be easily replaced and converted in accordance with the various shapes of the valve shaft of the butterfly valves. The hydraulic rotary actuator for opening and closing butterfly valves comprises: a cylindrical cylinder vertically opened; a piston having a shaft hole penetrated by the center and inserted into the cylinder to vertically reciprocate inside the cylinder in accordance with the supply and discharge of oil pressure; a rotary shaft inserted through the shaft hole of the piston, rotating back and forth in accordance with the vertical reciprocating motion of the piston, and having a spline connection groove recessed upward from the underside; an upper cover coupled to the upper part of the cylinder and having an upper cover hole penetrated to be inserted with the outer circumference of the top of the rotary shaft to be rotationally supported; a lower cover coupled to the lower part of the cylinder and having a lower cover hole penetrated to be inserted with the outer circumference of the bottom of the rotary shaft to be rotationally supported; and a valve connection part spline-coupled to be inserted in the spline connection groove of the rotary shaft, in which the exposed end of the valve shaft of the butterfly valves is inserted to be coupled.

Description

HYDRAULIC ROTARY ACTUATOR FOR OPENING AND CLOSING BUTTERFLY VALVE BACKGROUND OF THE INVENTION [0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic rotary actuator, more particularly, to a hydraulic rotary actuator for opening and closing a butterfly valve, which is connected to an exposed valve shaft of a butterfly valve and rotates a valve shaft of the butterfly valve, To an actuator.

In general, a valve is a device for controlling the flow rate, flow rate, pressure, etc. of a fluid flowing through a tube. Butterfly valves are used in various industrial fields, and in particular, they open or close the flow of various kinds of fluid such as industrial water, oil or seawater. Such a butterfly valve has advantages of smooth opening and closing operation of the valve, simple structure and good space utilization as compared with other valves.

1, the butterfly valve 10 includes a valve body 11 provided on a conduit (not shown) for transferring fluids in general, and a valve body 11 provided inside the valve body 11, And a valve shaft 13 which is coupled with the disk 12 to rotate the disk 12 and has one end exposed to the outside of the valve body 11 . That is, by opening and closing the valve shaft 13 exposed from the valve body 11, the disk 12 coupled with the valve shaft 13 is rotated.

In order to rotate the valve shaft 13, a rotation driving device is provided on the valve body 11 and a rotational force is transmitted to the valve shaft 13 through power transmission means in accordance with various power sources. For example, the power source may be a rotational force of a handle by manual operation of an operator, a rotational force of an electric motor, or a rotational force transmitted from an actuator such as an oil pressure or a pneumatic pressure. The power provided from the power source must be transmitted to the valve shaft 13 through the power transmission means by a rotational force. The power transmission means may be provided with various power transmission means such as a plurality of gears or a kinematic link connection will be.

For example, in the case of the 'rubber butterfly valve' of Korean Patent Laid-Open No. 10-2002-0003769, the power source is the rotational force of the handle by the manual operation of the operator, and the power transmitting means is a plurality of gear connections. In addition, in the case of the 'rotary valve actuator' of Korean Patent Registration No. 10-0482906, the power source is the rotational force of the electric motor, and the power transmitting means is the worm wheel gear connection. In the case of using the electric motor, the larger the power required, the larger the capacity and the size of the electric motor. Therefore, the whole device is increased in size , Complicated wiring and gear connection structure is required.

In order to solve this problem, a hydraulic rotary actuator which is quick in response due to mechanical force like hydraulic pressure and capable of generating a large force while downsizing the device is used. That is, the hydraulic rotary actuator is a device that linearly reciprocates the piston using hydraulic pressure and transmits linear motion to the output shaft connected to the piston to convert the rotary motion into rotational motion. (13) to open and close the disk (12) of the butterfly valve (10).

In the hydraulic rotary actuator as described above, a rack-pinion type and a scotch yoke type have been mainly used as a power transmitting means using hydraulic pressure as a power source. 2, the rack-and-pinion type 20 includes a pair of cylinders 21 provided on both left and right sides thereof, and a pair of rack gears 20, And a rotary shaft 25 having a pair of pistons 23 and a pinion gear 24 to be engaged with the rack gear 22 to rotate. 3, the scotch yoke type 30 includes a pair of cylinders 31 provided on both left and right sides, and a scotch 32 formed in the cylinder 31 and protruding from the center thereof A pair of pistons 33 and a rotary shaft 35 formed with a yoke 34 to rotate in combination with the scotch 32.

However, since both of the rack pinion type 20 and the scotch yoke type 30 are provided with the pair of the cylinders 21 and 31 and the pistons 23 and 33, the overall apparatus becomes large, Resulting in an increase in the manufacturing cost. Accordingly, a single piston is installed in one cylinder as in Korean Patent No. 10-0554689, Korean Patent No. 10-0578538 and Korean Patent No. 10-1424423, and a single piston is coaxial with the piston, And the rotation shaft is rotated in the normal and reverse directions by interlocking with the up-and-down movement of the piston. As a result, the overall size of the apparatus is reduced, thereby increasing the space utilization and reducing the manufacturing cost.

At this time, the rotary shaft of the hydraulic rotary actuator as described above must be coupled with the valve shaft 13 of the butterfly valve 10. Generally, the valve is manufactured by the valve manufacturer and the actuator is manufactured separately by the actuator manufacturing company. There is a problem that shapes, dimensions, and tolerances vary depending on manufacturers, products, and sizes. Therefore, in order to mutually combine these, there is a troublesome problem that the actuator manufacturing company needs to shape the rotary shaft of the actuator variously according to the valve shaft 13 of the butterfly valve 10 supplied from the valve maker.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems, and it is an object of the present invention to provide a butterfly valve having a rotary shaft having a constant shape irrespective of the shape of the valve shaft, And a valve connection portion that can be easily replaced and changed in accordance with the operation of the hydraulic actuator.

Other objects, specific advantages and novel features of the present invention will become more apparent from the following detailed description and preferred embodiments with reference to the accompanying drawings.

According to an aspect of the present invention, there is provided a hydraulic rotary actuator for opening and closing a butterfly valve, the hydraulic rotary actuator including: a cylindrical cylinder having an open top and bottom; a shaft hole formed at a center thereof; And a piston reciprocating upward and downward in the cylinder in accordance with the discharge, a piston inserted through the shaft hole of the piston, rotating in the forward and reverse directions according to the reciprocating motion of the piston, An upper cover coupled to an upper portion of the cylinder and having an upper cover hole through which an upper outer circumferential surface of the rotary shaft is rotatably inserted and which is coupled to a lower portion of the cylinder, And a lower cover hole through which the lower cover hole is rotatably supported, Splined to be inserted into the interior of the groove is characterized in that it comprises a valve connection is exposed valve shaft coupling end is inserted into the interior of the butterfly valve.

In addition, the cylinder may include a pair of fastening holes formed on its outer periphery so that guide pins guiding the reciprocating motion of the piston may be inserted therethrough. The piston is inserted into the guide A pair of guide slits are formed on an outer circumference of the guide slit so as to reciprocate vertically so as to reciprocate upward and downward, and a pair of guide grooves And the rotary shaft is formed with a through hole passing through the rotary shaft so as to rotate in the forward and reverse directions with respect to the piston in accordance with the upward and downward reciprocating motion of the piston inserted through the rotary pin.

Further, the rotary shaft has a rotation angle of 90 degrees with respect to the piston.

The upper cover may include an upper hydraulic port for supplying or discharging hydraulic pressure to the inside of the cylinder above the piston, and the lower cover may be configured to supply or discharge hydraulic pressure to the inside of the cylinder, A lower hydraulic port is formed.

Further, the upper cover and the lower cover are coupled to each other by a plurality of stud bolts.

A display line for displaying the rotation angle is formed on the upper surface of the rotation shaft, and a display scale corresponding to the display line is formed on the upper surface by a rotation angle of the rotation axis.

The valve connecting portion is inserted into the spline connection groove of the rotary shaft and splined to the outer circumferential surface so as to be splined thereon so that the valve shaft end portion of the butterfly valve is inserted and fitted, And the valve connection hole is formed vertically through the same shape.

Further, the valve shaft end portion is in the form of a flat polygonal shape or a "D" shape.

In addition, the valve shaft end portion and the valve connection hole of the valve connection portion are key-engaged with each other.

The valve shaft end portion of the butterfly valve has a circular shape on the flat surface. The valve connecting portion has a cylindrical valve connector splined up and down on the outer circumferential surface so as to be inserted into the spline connection groove of the rotation shaft and spline- A plurality of slits are formed in the vertical direction along the perimeter of the valve body in a vertically downwardly directed cylindrical shape and are provided so as to be capable of being drawn in and out along the lower longitudinal inner direction of the valve connector, And a fixed chuck having a diameter enlarged at the time of withdrawing from the lower end of the valve connector, wherein the fixed chuck is inserted into the lower end of the valve connector while the valve shaft end of the butterfly valve is inserted, And the outer circumferential surface of the valve shaft end portion is pressed and fixed.

The valve connector may include a grip pin insertion hole formed in a lower outer circumferential surface of the valve connector so as to extend inwardly of the grip connector, And the valve connecting portion is inserted into the pin slide hole of the fixing chuck through the grip pin insertion hole of the valve connector and is inserted into the valve connector of the fixed chuck by the upper and lower lengths of the pin slide hole And a slide pin for limiting a pull-in / out distance.

The valve connector may further include a spring installed inside the valve connector to provide an elastic force in a direction in which the fixing chuck is drawn out.

The hydraulic rotary actuator for opening and closing a butterfly valve according to the present invention introduces a new connection structure through a splined valve connection portion so that it can be easily changed and changed in accordance with various valve shaft shapes of a butterfly valve, Regardless of the shape of the shaft, it is possible to improve the productivity.

Particularly, when the valve shaft end portion of the butterfly valve is circular, the valve connecting portion is formed as a valve connector and a fixed chuck so that the rotational force of the rotary shaft can be accurately transmitted to the valve shaft while being easily attached and detached, thereby improving reliability and durability.

1 is a perspective view showing a general butterfly valve,
2 is a partially cutaway perspective view showing a rack-and-pinion type hydraulic rotary actuator according to the prior art,
3 is a partially cutaway perspective view showing a conventional scotch yoke type hydraulic rotary actuator,
4 is a perspective view showing an embodiment of a hydraulic rotary actuator for opening and closing a butterfly valve according to the present invention,
Fig. 5 is a partially cutaway perspective view showing a main part of the embodiment of Fig. 4,
Figure 6 is an exploded perspective view of the embodiment of Figure 5,
FIGS. 7 and 8 are perspective views showing a rotational movement of the rotary shaft interlocked with the upward and downward movement of the piston in the embodiment of FIG. 4,
FIG. 9 is a perspective view of a valve according to a first embodiment of a valve connecting portion of a hydraulic rotary actuator for opening and closing a butterfly valve according to the present invention,
10 is a perspective view showing a second embodiment of the valve connecting portion of the hydraulic rotary actuator for opening and closing the butterfly valve according to the present invention,
11 is a main part perspective view showing a third embodiment of the valve connecting portion of the hydraulic rotary actuator for opening and closing the butterfly valve according to the present invention,
12 is a side sectional view showing a state in which the embodiment of FIG. 11 is engaged,
13 and 14 are side cross-sectional views illustrating the operation of the valve connection in the embodiment of FIG.

Hereinafter, a preferred embodiment of a hydraulic rotary actuator for opening and closing a butterfly valve according to the present invention will be described in detail with reference to the accompanying drawings.

The hydraulic rotary actuator for opening and closing a butterfly valve according to the present invention includes a cylinder 100, a piston 200, a rotary shaft 300, an upper cover 400, And includes a cover 500 and a valve connection portion 600, and may further include a stud bolt 700. [ The piston 200 may further include a guide pin 110 and a rotation pin 230 for rotating the rotary shaft 300 in conjunction with the upward and downward movement of the piston 200.

As shown in FIGS. 4 to 6, the cylinder 100 is cylindrically shaped as it is called, and a piston 200, which will be described later, is installed therein to reciprocate the piston 200 upward and downward It is a hydraulic cylinder. That is, the cylinder 100 is formed in a cylindrical shape having open top and bottom, and a piston 200 and a rotary shaft 300, which will be described later, are installed therein. A pair of fastening holes 120 are formed on the outer circumference of the piston 200 to prevent rotation of the piston 200 and to insert a guide pin 110 for guiding the reciprocating movement of the piston 200 . The upper and lower openings of the cylinder 100 are closed by the upper cover 400 and the lower cover 500 together with the rotation shaft 300 described later.

At this time, a female screw and a male screw are respectively formed in the pair of fastening holes 120 and the guide pins 110 formed in the cylinder 100 so that the guide pins 110 are screwed to the fastening holes 120 The coupling hole 120 is provided with a packing means so that the hydraulic pressure supplied or discharged into the cylinder 100 is not leaked between the coupling surfaces of the guide pin 110 and the coupling hole 120.

5 to 8, a shaft hole 210 is formed at the center of the piston 200, and the piston 200 is inserted into the cylinder 100 and inserted into the cylinder 100 In the vertical direction. That is, the piston 200 is vertically reciprocated in the cylinder 100 by the hydraulic pressure supplied to or discharged from the cylinder 100, and the shaft hole 210 is formed so as to insert the rotary shaft 300.

4 to 8, the rotary shaft 300 is inserted through the shaft hole 210 of the piston 200 and rotates in the forward and reverse directions in conjunction with the reciprocating motion of the piston 200, The spline coupling groove 310 is formed to be depressed upward. The spline connection groove 310 is configured to transmit the rotational force of the rotation shaft 300 to the valve shaft 13 through the valve connection part 600 in relation to the valve connection part 600 to be described later. 7 and 8, the rotary shaft 300 rotates in the normal and reverse directions in conjunction with the vertical reciprocating motion of the piston 200. The cylinder 100, the piston 200, and the rotary shaft 300, A guide pin 110 and a rotation pin 230 are formed and a fastening hole 120, a guide slit 220, a rotation slit 240 and a through hole 320 are formed.

More specifically, the piston 200 includes a pair of guide slits 220 facing each other along the vertical direction on the outer circumference so that the guide pins 110 are inserted and reciprocated up and down with respect to the cylinder 100, And a pair of rotation slits 240 which are obliquely opposed to each other are formed to penetrate the rotary pin 230 for guiding the rotation of the rotary shaft 300.

That is, the piston 200 is vertically opened by the shaft hole 210 and the outer circumferential surface of the piston 200 is formed into a cylindrical shape having a guide slit 220 and a rotation slit 240, So that the vertical reciprocating motion is facilitated by the hydraulic pressure supplied into or discharged from the cylinder 100. [ In other words, the piston 200 is not rotated by the guide slit 220, which is perforated vertically so that the guide pin 110 fastened to the fastening hole 120 of the cylinder 100 slides, Lt; / RTI > 7, the piston 200 is rotated by the rotation slit 240, which is obliquely perforated so that the rotation pin 230 inserted through the through hole 320 of the rotation axis 300 slides, The rotation axis 300 is rotated in the forward direction (or clockwise direction) while the rotation pin 230 is moved to the lowermost end of the rotation slit 240. In this case, 8, when the piston 200 is vertically lowered in the cylinder 100 as shown in FIG. 8, the rotation pin 300 moves to the uppermost end of the rotation slit 240, (Or counterclockwise). That is, the rotary shaft 300 is inserted into the through hole 320 to be rotatable in the forward and reverse directions with respect to the piston 200 in conjunction with the upward and downward movement of the piston 200, .

At this time, the rotation slit 240 of the piston 200 is pierced by a slant or spiral having a predetermined length having an inclination angle of 20 to 60 degrees, and the rotation pin 230, which is inserted into the rotation axis 300, The rotation radius of the rotary shaft 300 is limited to 90 degrees when reaching the lowermost end and the uppermost end of the slit 240, respectively. That is, the rotary shaft 300 has an angle of rotation of 90 ° with respect to the piston 200, and the rotation of the rotary shaft 300 can be controlled by a valve such as a butterfly valve 10 shown in FIG. 1 or a ball valve It can be applied to a valve having a valve shaft 13 for opening and closing at a rotation angle of 90 °.

In other words, the rotation slit 240 is formed so that the rotation radius of the rotation axis 300 is limited to 90 degrees, and the stroke, which is the upward and downward movement distance of the piston 200, The output torque of the rotary shaft 300 connected to the rotary shaft 13 varies. That is, as the slant angle of the rotation slit 240 is smaller, the stroke of the piston 200 becomes shorter and the output torque of the rotation shaft 300 becomes smaller. The stroke refers to the one-way distance of the piston 200 reciprocating vertically in the cylinder 100. The longer the stroke of the piston 200, the larger the output torque of the rotary shaft 300 becomes. Accordingly, the hydraulic rotary actuator for opening and closing the butterfly valve according to the present invention can be manufactured with different slant angles of the rotate slit 240 according to the required output torque and the size of the cylinder 100.

A silicone or rubber O-ring is provided on the side surface of the piston 200 to increase the adhesion with the cylinder 100 so that the piston 200 is reciprocated vertically by the hydraulic pressure supplied or discharged into the cylinder 100. [ .

4 to 6, the upper cover 400 is coupled to an upper portion of the cylinder 100, and an upper cover hole 410 through which an upper outer circumferential surface of the rotary shaft 300 is inserted and rotatably supported is formed . The lower cover 500 is coupled to the lower portion of the cylinder 100 and has a lower cover hole 510 through which the lower end outer circumference of the rotation shaft 300 is inserted and rotatably supported. A thrust bearing is provided on the rotating shaft 300 to reduce frictional resistance between the upper cover hole 410 and the lower cover hole 510 of the upper cover 400 and the lower cover 500, .

5, the upper cover 400 is formed with an upper hydraulic port 420 for supplying or discharging hydraulic pressure to the interior of the cylinder 100 above the piston 200, The cover 500 is formed with a lower hydraulic port 520 for supplying or discharging hydraulic pressure to the inside of the cylinder 100 below the piston 200. Accordingly, when hydraulic pressure is supplied to the upper hydraulic port 420 of the upper cover 400, the piston 200 moves downward as shown in FIG. 8 and the lower hydraulic port of the lower cover 500 520, the piston 200 moves upward as shown in FIG. The upper cover 400 and the lower cover 500 may be firmly coupled to each other by a plurality of stud bolts 700.

A display line 330 for displaying a rotation angle is formed on the upper surface of the rotary shaft 300. The upper cover 400 is mounted on the upper surface of the display line 330 by a rotation angle of the rotary shaft 300, A corresponding indication scale 430 can be formed. Through the display line 330 and the display scale 430, the operator can visually confirm the rotational direction of the rotary shaft 300 and whether the butterfly valve 10 is open or closed.

5, the forward rotation (or clockwise) rotation of the rotary shaft 300 is transmitted to the butterfly valve 10, as shown in FIG. 7, in the hydraulic rotary actuator for opening and closing the butterfly valve according to the present invention, The hydraulic pressure is supplied to the lower hydraulic pressure port 520 formed on the lower cover 500 to close the upper portion of the upper cover 400. In this case, when the butterfly valve 10 is closed, And the hydraulic pressure is discharged to the hydraulic port 420. The piston 200 is lifted up in the cylinder 100 without being rotated by the guide pin 110 and the guide slit 220 so that the rotation pin 230, The rotary shaft 300 and the valve shaft 13 of the butterfly valve 10 connected to the rotary shaft 300 are rotated in the forward direction and the butterfly valve 10 is closed.

Conversely, assuming that the reverse (or counterclockwise) rotation of the rotary shaft 300 is associated with the opening of the butterfly valve 10, the opening of the butterfly valve 10 is required The hydraulic pressure is supplied to the upper hydraulic port 420 formed in the upper cover 400 and the hydraulic pressure is discharged to the lower hydraulic port 520 of the lower cover 500. Accordingly, the piston 200 is lowered in the cylinder 100 without being rotated by the guide pin 110 and the guide slit 220, and the rotation pin 230, which is inserted into the rotation shaft 300, The rotary shaft 300 and the valve shaft 13 of the butterfly valve 10 connected to the rotary shaft 300 are rotated in the reverse direction so that the butterfly valve 10 is opened.

The valve connection portion 600 is splined to be inserted into the spline connection groove 310 of the rotary shaft 300 as shown in FIGS. 4, 6 and 9 to 14, And the end of the shaft 13 is inserted and coupled to the inside. The rotational force of the piston 200 moving up and down in the cylinder 100 and the rotating shaft 300 rotating in conjunction with the piston 200 is transmitted to the valve shaft 13 of the butterfly valve 10 through the valve connecting portion 600, So that it can be opened and closed.

9 and 10, the valve connection part 600 is inserted into the spline connection groove 310 of the rotation shaft 300 and is splined up and down on the outer circumferential surface so as to be splined, A valve connection hole 610 is formed in the upper and lower portions in the same shape as the end portion of the valve shaft 13 so that the end of the exposed valve shaft 13 of the butterfly valve 10 is inserted and formed. For example, the end of the valve shaft 13 is shown in a square shape in a plan view as shown in FIG. 9, but it may be a polygonal shape such as a pentagon or a hexagon, and may be a "D" shape, though it is not shown in the figure. 10, the end of the valve shaft 13 and the valve connection hole 610 of the valve connection portion 600 may be key-engaged with each other.

Even though the end of the valve shaft 13 of the butterfly valve 10 has various shapes, a spline connection groove 310 having the same shape and size can be formed on the lower surface of the rotation shaft 300, The valve connection hole 610 may be formed in a shape corresponding to the shape of the end of the valve shaft 13 through the through hole 600.

When the end of the valve shaft 13 of the butterfly valve 10 is circular in the form of a flat surface, the valve connection hole 610 is also circular, so that the rotational force of the rotation shaft 300 is transmitted through the valve connection portion 600, There is a case that the valve can not be transmitted to the valve shaft 13 of the fly valve 10. At this time, the valve connection portion 600 can be constituted by the valve connector 620 and the fixing chuck 630 as shown in Figs. 11 to 14 without having to reprocess both of them in the above-described shape, and the slide pin 640 and And may further include a spring 650.

11, the valve connecting part 600 is inserted into the spline coupling groove 310 of the rotary shaft 300 and splined to the outer circumferential surface thereof so as to be splined, A plurality of slits 631 are formed in the vertical direction along the perimeter of the cylinder in the downstream direction of the valve connector 620, 620, and a fixing chuck 630 whose diameter is expanded when the valve connector 620 is drawn out from the lower end of the valve connector 620. At this time, as shown in 12 to 14, the fixing chuck 630 is reduced in diameter while being inserted into the lower end of the valve connector 620 at the same time as the end of the valve shaft 13 of the butterfly valve 10 is inserted The outer peripheral surface of the inserted end portion of the valve shaft 13 is pressed and fixed.

That is, since the fixing chuck 630 has a cylindrical shape whose upper diameter is narrower than the diameter of the lower portion and a plurality of slits 631 are formed around the fixing chuck 630, a force is applied in the radial direction to grasp the slits 631 The diameter is reduced, and when the force is released, it expands to its original shape. 13 and 14, when the fixing chuck 630 is installed so as to be able to be drawn in and out along the inner longitudinal direction of the lower end of the valve connector 620, the fixing chuck 630 is inserted into the lower end of the valve connector 620, 630 are radially inwardly urged to reduce the diameter and radially outward from the lower end of the valve connector 620 to remove the force and expand to its original shape.

That is, the fixing chuck 630 moves upward into the valve connector 620 as it is inserted into the valve shaft 13 of the butterfly valve 10, as shown in FIGS. At this time, the end of the valve shaft 13 is inserted into the fixing chuck 630 and the fixing chuck 630 is drawn into the lower end of the valve connector 620, The outer peripheral surface of the end portion of the shaft 13 is pressed and fixed.

The fixing chuck 630 is inserted in the valve connector 620 and the fixing chuck 630 so as to be capable of being pulled out into the lower end of the valve connector 620 in relation to the valve connector 620, And a pin slide hole 632 are formed, and a slide pin 640 is provided. 11 through 14, the valve connector 620 has a grip pin insertion hole 621 formed in its lower outer circumferential surface to extend inward, and the fixing chuck 630 is inserted into the valve connector 620 A pin slide hole 632 is formed in the outer circumferential surface along the longitudinal direction so as to correspond to the grip pin insertion hole 621 with a longer hole than the grip pin insertion hole 621. At this time, the slide pin 640 is inserted into the pin slide hole 632 of the fixing chuck 630 through the grip pin insertion hole 621 of the valve connector 620, Out length of the fixing chuck 630 with respect to the valve connector 620 by the length.

The valve connector 620 and the fixing chuck 630 are coupled to each other by the slide pin 640 and the pin slide hole 630 of the fixing chuck 630 is inserted into the pin insertion hole 621 of the valve connector 620, 632 are formed as upper and lower long holes, the fixing chuck 630 can slide up and down with respect to the valve connector 620. The upward and downward sliding of the fixing chuck 630 with respect to the valve connector 620 is the same as when the fixing connector 630 is inserted into or withdrawn from the lower end of the valve connector 620.

After the end of the valve shaft 13 is inserted into the fixing chuck 630 with respect to the valve connector 620, the diameter of the fixing chuck 630 is reduced and the outer peripheral surface of the end of the valve shaft 13 is pressed Respectively. On the contrary, when the valve connector 620 is lifted upward, the end of the valve shaft 13 inserted into the fixing chuck 630 will be released from the fixing chuck 630 while being released from pressure. At this time, if the fixing chuck 630 is kept in a state in which the diameter of the fixing chuck 630 is reduced, that is, the state in which the fixing chuck 630 is drawn into the lower end of the valve connector 620, And the fixing chuck 630 may be difficult to separate.

In order to help the fixing chuck 630 with respect to the valve connector 620 to be pulled out to the original position after being pulled in, as shown in Figs. 11 to 14, the fixing chuck 630 is installed inside the valve connector 620, And a spring 650 that provides an elastic force in a direction in which the chuck 630 is drawn out. Therefore, when the valve shaft 13 is inserted into the fixing chuck 630 and is pressed and fixed, the fixing chuck 630 is retracted from the valve connector 620 by the elastic force of the spring 650 The fixing chuck 630 overcomes the spring force of the spring 650 and enters the lower end of the valve connector 620. [ When the valve shaft 13 is separated from the fixed chuck 630, the biasing force of the fixed chuck 630 itself or the elastic force of the slit 631 is transmitted from the valve connector 620 through the spring force of the spring 650, So that a state in which the battery 630 is drawn out can be maintained.

As described above, the hydraulic rotary actuator for opening and closing the butterfly valve according to the present invention is configured such that the cylinder 100 and the piston 200 are installed in the coaxial direction of the rotary shaft 300 by the upper cover 400 and the lower cover 500 Since the entire apparatus is made smaller than that of the conventional rack-pinion type and the scarc yoke type, space efficiency can be improved. Therefore, assembly and disassembly for installation and repair are easy, and the valve shaft 13 of the butterfly valve 10 ), There is no interference with the piping and the peripheral devices during the connection work, so that the efficiency in installation and maintenance can be greatly improved.

It is also possible to introduce a new connection structure through the valve connection part 600 which is formed by spline S so that the butterfly valve 10 can be easily changed and changed in conformity with various valve shaft shapes 13, The rotary shaft 300 having a constant shape can be provided irrespective of the shape of the valve shaft 13 of the valve shaft 13, so that the productivity can be improved.

Particularly, when the end of the valve shaft 13 of the butterfly valve 10 is circular, the valve connecting portion 600 is constituted by the valve connector 620 and the fixing chuck 630 so that the rotational force of the rotary shaft 300 Can be accurately transmitted to the valve shaft (13), and reliability and durability can be improved.

The embodiments of the present invention described above and shown in the drawings should not be construed as limiting the technical idea of the present invention. The scope of protection of the present invention is limited only by the matters described in the claims, and those skilled in the art will be able to modify the technical idea of the present invention in various forms. Accordingly, such improvements and modifications will fall within the scope of the present invention as long as they are obvious to those skilled in the art.

S: Spline
10: Butterfly valve 13: Valve shaft
100: Cylinder
110: guide pin 120: fastening hole
200: piston
210: shaft hole 220: guide slit
230: Rotate pin 240: Rotate slit
300: rotation axis 310: spline connection groove
320: Through hole 330: Display line
400: upper cover 410: upper cover hole
420: upper hydraulic port 430: indication scale
500: bottom cover
510: lower cover hole 520: lower hydraulic port
600: Valve connection part 610: Valve connection hole
620: Valve connector 621: Finger pin insertion hole
630: Fixing chuck
631: Slit 632: Pin slide hole
640: slide pin
650: spring
700: Stud bolt

Claims (12)

A cylindrical cylinder which is opened up and down,
A piston inserted into the cylinder and reciprocating up and down in the cylinder according to supply and discharge of hydraulic pressure,
A rotation shaft inserted into the shaft hole of the piston and rotating in the forward and reverse directions in conjunction with the reciprocating motion of the piston,
An upper cover coupled to an upper portion of the cylinder and having an upper cover hole through which an upper outer peripheral surface of the rotary shaft is rotatably inserted,
A lower cover coupled to a lower portion of the cylinder and having a lower cover hole through which a lower end outer peripheral surface of the rotary shaft is inserted and rotatably supported,
And a valve connection portion splined to be inserted into the spline connection groove of the rotary shaft and to which the exposed valve shaft end portion of the butterfly valve is inserted and coupled to the inside.
The method according to claim 1,
The cylinder
A pair of fastening holes passing through the outer periphery of the guide pin for guiding the upward and downward reciprocating movement of the piston,
The piston,
A pair of guide slits are formed on the outer circumference of the guide pin to face each other along the vertical direction so as to reciprocate up and down with respect to the cylinder, and a rotation pin for guiding the rotation of the rotation shaft is inserted A pair of rotatable slits facing each other with an oblique line passing through the outer periphery,
The rotation shaft
Wherein a through hole is formed through the outer periphery of the piston so as to rotate in a forward and reverse direction with respect to the piston in association with the upward and downward reciprocating motion of the piston.
3. The method of claim 2,
The rotation shaft
Wherein the rotation angle of the piston is 90 degrees with respect to the piston.
The method according to claim 1,
Wherein the upper cover comprises:
An upper hydraulic port for supplying or discharging hydraulic pressure to the inside of the cylinder is formed above the piston,
Wherein the lower cover comprises:
Wherein a lower hydraulic port for supplying or discharging hydraulic pressure to the inside of the cylinder is formed below the piston. ≪ Desc / Clms Page number 19 >
The method according to claim 1,
Wherein the upper cover and the lower cover comprise:
Wherein the plurality of stud bolts are coupled to each other by a plurality of stud bolts.
The method according to claim 1,
The rotation shaft
A display line for displaying a rotation angle is formed on the upper surface,
Wherein the upper cover comprises:
And a display scale corresponding to the display line is formed on an upper surface of the rotary shaft by a rotation angle of the rotary shaft.
The method according to claim 1,
The valve connection portion
A valve connection hole is formed in the same shape as the shape of the valve shaft end so that the exposed valve shaft end of the butterfly valve is inserted and formed, Wherein the hydraulic actuator is formed so as to be vertically penetrated.
8. The method of claim 7,
Wherein the valve shaft end portion
Wherein the valve body has a flat polygonal shape or a "D" shape.
8. The method of claim 7,
Wherein the valve shaft end portion and the valve connection hole of the valve connection portion are key-engaged with each other. ≪ RTI ID = 0.0 > 11. < / RTI >
The method according to claim 1,
Wherein the valve shaft end of the butterfly valve
Flat,
The valve connection portion
A cylindrical valve connector which is inserted into the spline connection groove of the rotary shaft and splined up and down on the outer peripheral surface so as to be splined,
A plurality of slits are formed in the vertical direction along the perimeter of the valve body in a vertically downwardly directed cylindrical shape and are provided so as to be capable of being drawn in and out along the lower longitudinal inner direction of the valve connector, And a fixing chuck whose diameter is expanded when the valve connector is drawn out from the lower end of the valve connector,
Wherein the fixing chuck comprises:
Wherein the valve shaft end portion of the butterfly valve is inserted into the lower end of the valve connector and the diameter is reduced while pressing the outer peripheral surface of the inserted valve shaft end portion.
11. The method of claim 10,
Wherein the valve connector comprises:
A grip pin insertion hole is formed through the lower outer circumferential surface inwardly,
Wherein the fixing chuck comprises:
A pin slide hole is formed in the outer circumferential surface of the valve connector so as to correspond to the grip pin insertion hole with a longer hole than the grip pin insertion hole of the valve connector along the longitudinal direction,
The valve connection portion
And a slide pin inserted into the pin slide hole of the fixing chuck through a grip pin insertion hole of the valve connector and limiting a pull-in / out distance of the fixing chuck with respect to the valve connector by the upper and lower lengths of the pin slide hole. Hydraulic rotary actuator for opening and closing butterfly valve.
12. The method of claim 11,
The valve connection portion
Further comprising a spring installed inside the valve connector to provide an elastic force in a direction in which the fixing chuck is pulled out. The hydraulic rotary actuator for opening and closing a butterfly valve according to claim 1,

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