JP2017026136A - Hydraulic rotary actuator for opening and closing butterfly valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hydraulic rotary actuator for opening and closing a butterfly valve capable of improving productivity by having a rotating shaft of fixed shape regardless of shapes of valve shafts of various butterfly valves, and capable of introducing a new connection structure by a valve connection portion which can be easily replaced or converted in correspondence with the shapes of various valve shafts of the butterfly valves.SOLUTION: A hydraulic rotary actuator includes a cylinder 100 opened at its upper and lower portions, a piston 200 inserted into the cylinder 100 and vertically reciprocated inside of the cylinder 100 by supplying and discharging a hydraulic pressure, a rotating shaft 300 rotated in forward and backward directions while interlocking with the vertical reciprocation of the piston 200, an upper cover 400 connected to an upper portion of the cylinder 100, a lower cover 500 connected to a lower portion of the cylinder 100, and a valve connection portion 600 spline-connected to the rotating shaft 300, and connected with a valve shaft of a butterfly valve.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a hydraulic rotary actuator, and more specifically, a butterfly valve opening / closing hydraulic pressure that is connected to an exposed valve shaft of a butterfly valve and opens and closes the butterfly valve by rotating the valve shaft of the butterfly valve by hydraulic operation. The present invention relates to a rotary actuator.

  Generally, a valve is a device that controls the flow rate, flow rate, pressure, and the like of a fluid flowing in a pipe. Valves can be divided into many types according to the purpose, but butterfly valves are used in many industrial fields, especially to open or close the flow of various fluids such as industrial water, oil or seawater . Such a butterfly valve has advantages in that the opening and closing operation of the valve is smoother than other valves, the structure is simple, and the space utilization is good.

  As shown in FIG. 1, the butterfly valve 10 as described above is generally rotatable inside a valve body 11 and a valve body 11 installed on a conduit (not shown) for transferring a fluid. A disc-shaped disc 12 that opens and closes a pipe line, and is connected to the disc 12 to rotate the disc 12 and has a valve shaft 13 having one end exposed to the outside of the valve body 11. Is done. That is, when the valve shaft 13 exposed from the valve body 11 is rotated, the opening / closing operation is performed by the rotation of the disk 12 coupled to the valve shaft 13.

  In order to rotate the valve shaft 13, a rotation driving device is installed on the valve body 11, and a rotational force is transmitted to the valve shaft 13 through power transmission means by providing various power sources. For example, the power source may be a rotational force of a handle manually operated by an operator, a rotational force of an electric motor, or a rotational force transmitted from an actuator such as hydraulic pressure or pneumatic pressure. The power provided from such a power source must be transmitted as a rotational force to the valve shaft 13 through the power transmission means. As such power transmission means, various power transmission means such as a plurality of gear connections and mechanical link connections can be provided.

  For example, in the case of the “rubber butterfly valve” of Patent Document 1, it can be seen that the power source is the rotational force of the handle manually operated by the operator, and the power transmission means is a plurality of gear connections. In the case of the “rotary valve actuator” of Patent Document 2, the power source is the rotational force of the electric motor, and the power transmission means is a worm wheel gear connection. Here, when the handle is rotated by the manual operation, there is a big disadvantage that it is naturally limited to manual operation. When an electric motor is used, the capacity and size of the electric motor increase as the required power increases. As a result, the overall apparatus is enlarged, and complicated wiring and gear connection structures are required.

  In order to solve such a problem, a hydraulic rotary actuator is used which has a quick response with mechanical force such as hydraulic pressure and can output a large force while downsizing the apparatus. That is, the hydraulic rotary actuator is a device that reciprocates the piston linearly using hydraulic pressure, transmits the linear motion to an output shaft connected to the piston, and converts the linear motion into a rotational motion. The movement is transmitted to the valve shaft 13 of the butterfly valve 10 to open and close the disk 12 of the butterfly valve 10.

  The hydraulic rotary actuator as described above uses hydraulic pressure as a power source, and a rack and pinion mechanism and a scotch yoke mechanism have been mainly used as power transmission means. That is, as shown in FIG. 2, the rack and pinion mechanism 20 includes a pair of cylinders 21 provided on both the left and right sides, a pair of pistons 23 each built in the cylinder 21 and having a rack gear 22 formed in the center, A rotation shaft 25 having a pinion gear 24 formed so as to mesh with the rack gear 22 and rotate is configured. Further, as shown in FIG. 3, the scotch yoke mechanism 30 includes a pair of cylinders 31 provided on the left and right sides, and a pair of pistons 33 each formed in the cylinder 31 and having a scotch 32 protruding in the center. And a rotating shaft 35 on which a yoke 34 is formed to be coupled to the scotch 32 and rotate.

  However, since the rack and pinion mechanism 20 and the scotch yoke mechanism 30 described above each include a pair of cylinders 21 and 31 and pistons 23 and 33, the overall apparatus becomes large and space utilization is reduced. There is a problem that the manufacturing unit price increases. Therefore, as in Patent Documents 3 to 5, a single piston is installed inside one cylinder, and a rotating shaft is inserted coaxially with the piston, and the rotation is performed in conjunction with the vertical movement of the piston. By rotating the shaft forward and backward, the overall size of the device is reduced, space utilization is improved, and the manufacturing unit price can be dramatically reduced.

  At this time, the rotary shaft of the hydraulic rotary actuator as described above must be connected to the valve shaft 13 of the butterfly valve 10. Generally, the valve is manufactured by a valve manufacturing company, and the actuator is separately manufactured by an actuator manufacturing company. Since they are manufactured, there is a problem in that both have various shapes, dimensions, and tolerances according to manufacturing companies, products, and sizes. Therefore, in order to couple them together, the actuator manufacturing company has to process the rotary shaft of the actuator into various shapes according to the valve shaft 13 of the butterfly valve 10 delivered from the valve manufacturing company. There's a problem.

Korean Published Patent No. 10-2002-0003769 Korean Registered Patent No. 10-0482906 Korean Registered Patent No. 10-055489 Korean Registered Patent No. 10-0578538 Korean Registered Patent No. 10-1424423

  The object of the present invention, which has been made to solve the above-described problems, is to improve the productivity by having a rotating shaft having a fixed shape regardless of the shape of the valve shaft of various butterfly valves. Another object of the present invention is to provide a hydraulic rotary actuator for opening and closing a butterfly valve in which a new connection structure is introduced through a valve connecting portion that can be easily replaced and converted according to various valve shaft shapes of the butterfly valve.

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

  In order to achieve the above-mentioned object, a hydraulic rotary actuator for opening and closing a butterfly valve according to the present invention includes a cylindrical cylinder that is opened up and down, and a shaft hole that is formed through the center. The piston inserted and reciprocated up and down inside the cylinder by hydraulic supply and discharge, and inserted through the shaft hole of the piston and rotated in the forward and reverse directions by the up and down reciprocation of the piston, A rotary shaft having a spline connecting groove recessed upward, and an upper cover coupled to the upper portion of the cylinder and having an upper cover hole inserted and inserted into the outer peripheral surface of the upper end of the rotary shaft. The lower cover ho that is coupled to the lower part of the cylinder and is rotatably supported by inserting the outer peripheral surface of the lower end of the rotating shaft. And a valve connecting part that is splined so as to be inserted into the spline connecting groove of the rotating shaft, and an exposed end of the valve shaft is inserted and connected to the inside of the rotating shaft. It is characterized by including.

  Further, the cylinder is formed with a pair of fastening holes facing the outer periphery so that a guide pin for guiding the vertical reciprocating motion of the piston is inserted and fastened, and the guide pin is inserted into the piston. A pair of guide slits are formed through the outer periphery so as to reciprocate up and down with respect to the cylinder as a reference, and a rotate pin for guiding the rotational movement of the rotating shaft is inserted and fastened. A pair of rotating slits that are diagonally opposed to each other are formed through the outer periphery of the rotating shaft, and the rotating pin is inserted through the rotating shaft, and the piston is rotated in the forward and reverse directions with respect to the piston by the reciprocating motion of the piston. As described above, a through hole is formed through the outer periphery.

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

  Further, the upper cover is provided with an upper hydraulic port for supplying hydraulic pressure to the inside of the cylinder above the piston or discharging the hydraulic pressure from the cylinder, and the lower cover is provided with the hydraulic pressure below the piston. A lower hydraulic port for supplying hydraulic pressure to the inside of the cylinder and discharging hydraulic pressure from the cylinder is formed.

  The upper cover and the lower cover may be coupled to each other by a plurality of stud bolts.

  A display line for displaying a 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 of the upper cover by the rotation angle of the rotation shaft. It is characterized by that.

  In addition, the valve connecting portion is inserted into the spline connecting groove of the rotating shaft and splined up and down on the outer peripheral surface so as to be splined, and the valve connecting portion includes a valve exposed to the butterfly valve. A valve connecting hole is formed in the same shape as the shape of the end of the valve shaft so that the end of the shaft is inserted and fitted.

  Further, the end of the valve shaft has a polygonal shape or a “D” shape on a flat cross section.

  The valve shaft end and the valve connection hole of the valve connection portion are key-coupled to each other.

  In addition, the end of the valve shaft of the butterfly valve has a circular shape on a flat cross section, and the valve connecting portion is inserted into the spline connecting groove of the rotating shaft so as to be splined up and down on the outer peripheral surface. A plurality of slits are formed in the vertical length direction along the circumference on the upper and lower cylinders, and drawn in along the inner length direction of the lower end of the valve connector. A fixed chuck that can be pulled out and has a diameter that is reduced when the valve connector is pulled into the lower end of the valve connector, and a diameter that is expanded when the valve connector is pulled out from the lower end of the valve connector. At the same time as the end of the valve shaft of the butterfly valve is inserted, the fixed chuck is retracted into the lower end of the valve connector. Which while being reduced in diameter, characterized in that compressed and secured to the outer peripheral surface of the end portion of the inserted the valve shaft.

  In addition, a grip pin insertion hole is formed through the outer peripheral surface of the lower end of the valve connector toward the inside, and the fixed chuck is longer than the grip pin insertion hole of the valve connector. A pin slide hole is formed through the outer peripheral surface along the vertical direction so as to correspond to the hole, and the valve connecting portion is inserted to the pin slide hole of the fixed chuck through the grip pin insertion hole of the valve connector. The slide pin further includes a slide pin that limits a pull-in / pull-out distance of the fixed chuck with respect to the valve connector by a vertical length of the pin slide hole.

  The valve connecting part may further include a spring that is installed inside the valve connector and provides an elastic force in a direction in which the fixed chuck is pulled out.

  The hydraulic rotary actuator for opening and closing the butterfly valve according to the present invention introduces a new connection structure through a spline-processed valve connection part so that it can be easily replaced and converted according to the shape of various valve shafts of the butterfly valve, Regardless of the shape of the valve shaft of the butterfly valve, it is possible to have a rotating shaft with a fixed shape, and productivity can be improved.

  In particular, when the end of the valve shaft of the butterfly valve is circular, the valve connecting portion is composed of a valve connector and a fixed chuck, and the torque of the rotating shaft can be accurately transmitted to the valve shaft while being easily attached to and detached from each other. And reliability and durability can be improved.

FIG. 1 is a perspective view showing a general butterfly valve. FIG. 2 is a partially cut perspective view showing a rack and pinion type hydraulic rotary actuator according to the prior art. FIG. 3 is a partially cut perspective view showing a scotch yoke type hydraulic rotary actuator according to the prior art. FIG. 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 cut perspective view showing the main part of the embodiment of FIG. FIG. 6 is an exploded perspective view of the embodiment of FIG. FIG. 7 is a perspective view of the main part showing the rotational movement of the rotary shaft interlocked with the vertical movement of the piston in the embodiment of FIG. FIG. 8 is a perspective view of the main part showing the rotational movement of the rotary shaft that is linked by the vertical movement of the piston in the embodiment of FIG. FIG. 9 is a perspective view showing a main part of 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. FIG. 10 is a main part 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. FIG. 11 is a perspective view of the essential part 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. FIG. 12 is a side sectional view showing a state where the embodiment of FIG. 11 is combined. FIG. 13 is a side sectional view showing an operation process of the valve connecting portion in the embodiment of FIG. FIG. 14 is a side sectional view showing an operation process of the valve connecting portion 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.

  A hydraulic rotary actuator for opening and closing a butterfly valve according to the present invention includes a cylinder 100, a piston 200, a rotating shaft 300, an upper cover 400, a lower cover 500, and a valve as shown in FIGS. The connection part 600 may be included, and the stud bolt 700 may be further included. In addition, a guide pin 110 and a rotate pin 230 may be further included to rotate in conjunction with the rotation shaft 300 according to the vertical movement of the piston 200.

  As shown in FIGS. 4 to 6, the cylinder 100 has a cylindrical shape opened up and down, and a piston 200 described later is installed therein, and the piston 200 reciprocates up and down by hydraulic operation. It is. That is, the cylinder 100 is manufactured in a cylindrical shape with an upper portion and a lower portion opened, and a piston 200 and a rotating shaft 300 described later are installed inside. The cylinder 100 is formed with a pair of fastening holes 120 that are opposed to the outer periphery so that the guide pins 110 that prevent the piston 200 from rotating and guide the reciprocating motion of the piston 200 are inserted and fastened. The The cylinder 100 is closed at the upper and lower portions opened by the upper cover 400 and the lower cover 500 together with the rotating shaft 300 described later.

  At this time, a female screw and a male screw are respectively formed in a pair of fastening holes 120 and guide pins 110 formed through the cylinder 100 so that the guide pins 110 are screw-coupled to the fastening holes 120. 120 is provided with packing means (not shown) so that the hydraulic pressure supplied to the inside of the cylinder 100 or discharged from the cylinder 100 does not leak between the coupling surfaces of the guide pin 110 and the fastening hole 120. .

  As shown in FIGS. 5 to 8, the piston 200 has a shaft hole 210 penetratingly formed at the center thereof, inserted into the cylinder 100, and reciprocated up and down within the cylinder 100 by supplying and discharging hydraulic pressure. To do. That is, the piston 200 is vertically reciprocated in the cylinder 100 by the hydraulic pressure supplied to the cylinder 100 or discharged from the cylinder 100, and the shaft 200 is inserted into the piston 200 so that the rotating shaft 300 is inserted. 210 is formed through.

  4 to 8, the rotating 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 vertical reciprocating motion of the piston 200. Thus, the spline connecting groove 310 is formed to be depressed upward. The spline connecting groove 310 is configured to transmit the rotational force of the rotary shaft 300 to the valve shaft 13 via the valve connecting portion 600 in relation to the valve connecting portion 600 described later. As shown in FIGS. 7 and 8, the rotary shaft 300 rotates in the forward and reverse directions in conjunction with the reciprocating motion of the piston 200. For this reason, the cylinder 100 and the piston 200 are rotated. The rotating shaft 300 includes a guide pin 110 and a rotate pin 230, and a fastening hole 120, a guide slit 220, a rotate slit 240, and a through hole 320 are formed, respectively.

  More specifically, the piston 200 includes a pair of guide slits 220 that are inserted in the piston 200 and face the outer periphery along the vertical length direction so as to reciprocate up and down with respect to the cylinder 100. A pair of rotate slits 240 are formed in a penetrating manner so as to be diagonally opposed to the outer periphery so that a rotate pin 230 is inserted and fastened to guide the rotational movement of the rotary shaft 300.

  That is, the piston 200 is manufactured in a cylindrical shape whose upper and lower sides are opened by the shaft hole 210, and a guide slit 220 and a rotate slit 240 are perforated on the outer peripheral surface, and the outer diameter is approximately the inner diameter of the cylinder 100. It is manufactured as small as 0.1 mm or less, and facilitates vertical reciprocation by hydraulic pressure supplied to the cylinder 100 or discharged from the cylinder 100. In other words, the piston 200 does not rotate by the guide slit 220 drilled in the vertical direction so that the guide pin 110 fastened to the fastening hole 120 of the cylinder 100 is slid. To do. At this time, the piston 200 is moved into the cylinder 100 as shown in FIG. 7 by the rotation slit 240 that is perforated so that the rotation pin 230 inserted into the through hole 320 of the rotating shaft 300 is slid. In the case of ascending vertically, the rotation shaft 300 rotates in the forward direction (or clockwise direction) while the rotation pin 230 moves to the lowest end of the rotation slit 240. On the other hand, when the piston 200 descends vertically in the cylinder 100 as shown in FIG. 8, the rotation shaft 300 moves in the reverse direction (or while the rotation pin 230 moves to the uppermost end of the rotation slit 240. Rotate counterclockwise. That is, the rotation pin 230 is inserted through the rotary shaft 300, and the through hole 320 is formed on the outer periphery so as to rotate in the forward and reverse directions with respect to the piston 200 in conjunction with the vertical reciprocation of the piston 200. Is formed through.

  At this time, the rotation slit 240 of the piston 200 is perforated in a slanted line shape or a spiral shape having an inclination angle of 20 ° to 60 °, and the rotation pin 230 inserted through the rotating shaft 300 is inserted into the rotation slit 300. When reaching the lowermost end and the uppermost end of 240, the rotation angle of the rotary shaft 300 is limited to 90 °. That is, the rotation shaft 300 has a rotation angle of 90 ° with respect to the piston 200, and the butterfly valve 10 shown in FIG. 1 or not shown in the drawing for opening and closing the valve like a ball valve. The valve shaft 13 can be applied to a valve whose rotation angle is 90 °.

  In other words, the rotation slit 240 restricts the rotation angle of the rotary shaft 300 to 90 °, and is connected to the stroke that is the vertical movement distance of the piston 200 and the valve shaft 13 by the oblique line angle between the lowermost end and the uppermost end. The output torque of the rotating shaft 300 changes. That is, the smaller the oblique line angle of the rotate slit 240, the shorter the stroke of the piston 200 and the smaller the output torque of the rotating shaft 300. The stroke means a one-way distance of the piston 200 that reciprocates vertically in the cylinder 100, and the output torque of the rotary shaft 300 increases as the stroke of the piston 200 increases. Therefore, the hydraulic rotary actuator for opening and closing the butterfly valve according to the present invention can be manufactured by changing the oblique line angle of the rotate slit 240 according to the required output torque and the size of the cylinder 100.

  On the other hand, the side surface of the piston 200 is provided with an O-ring made of silicon or rubber, and by increasing the adhesion with the cylinder 100, the hydraulic pressure supplied to or discharged from the cylinder 100 is increased. The vertical reciprocation of the piston 200 is facilitated.

  As shown in FIGS. 4 to 6, the upper cover 400 is coupled to the upper portion of the cylinder 100, and the upper cover 400 is rotatably supported by inserting the outer peripheral surface of the upper end of the rotating shaft 300. A hole 410 is formed through. The lower cover 500 is coupled to the lower portion of the cylinder 100, and the lower cover 500 is formed with a lower cover hole 510 through which the outer peripheral surface of the lower end of the rotary shaft 300 is inserted to be rotatably supported. At this time, the rotating shaft 300 may be provided with a thrust bearing 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, respectively.

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

  On the other hand, a display line 330 for displaying a rotation angle is formed on the upper surface of the rotation shaft 300, and a display corresponding to the display line 330 by the rotation angle of the rotation shaft 300 is formed on the upper surface of the upper cover 400. A scale 430 may be formed. Through such display lines 330 and display scales 430, the operator can easily confirm with the naked eye the rotation direction of the rotary shaft 300 and whether or not the butterfly valve 10 is opened or closed.

  The butterfly valve opening / closing hydraulic rotary actuator according to the present invention described above with reference to FIG. 5 through the above-described configuration, as shown in FIG. 7, the rotation of the rotation shaft 300 in the positive direction (or clockwise direction) is the butterfly valve. When it is required to close the butterfly valve 10 as linked to the closing of the upper cover 10, the hydraulic pressure is supplied to the lower hydraulic port 520 formed in the lower cover 500 and the hydraulic pressure is supplied from the upper hydraulic port 420 of the upper cover 400. Is discharged. As a result, the piston 200 rises in the cylinder 100 without rotating by the guide pin 110 and the guide slit 220, and the rotate pin 230 pierced and fastened to the rotating shaft 300 slides to the lowest end of the rotate slit 240. However, the rotary shaft 300 and the valve shaft 13 of the butterfly valve 10 connected thereto rotate in the forward direction, and the butterfly valve 10 performs a closing operation.

  On the other hand, as shown in FIG. 8, if it is required to open the butterfly valve 10 on the assumption that the reverse (or counterclockwise) rotation of the rotary shaft 300 is linked to the opening of the butterfly valve 10, Hydraulic pressure is supplied to the upper hydraulic pressure port 420 formed in the cover 400, and hydraulic pressure is discharged from the lower hydraulic pressure port 520 of the lower cover 500. As a result, 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 penetratingly fastened to the rotation shaft 300 slides to the uppermost end of the rotation slit 240. However, the rotary shaft 300 and the valve shaft 13 of the butterfly valve 10 connected thereto rotate in the reverse direction, and the butterfly valve 10 opens.

  As shown in FIGS. 4, 6, and 9 to 14, the valve connecting part 600 is splined so as to be inserted into the spline connecting groove 310 of the rotating shaft 300, and the butterfly valve 10 is exposed. The end of the valve shaft 13 is inserted and coupled to the inside. As a result, the rotational force of the piston 200 that moves up and down inside the cylinder 100 and the rotating shaft 300 that rotates in conjunction with the piston 200 is transmitted to the valve shaft 13 of the butterfly valve 10 via the valve connecting portion 600, and the butterfly valve. 10 can be opened and closed.

  At this time, as shown in FIGS. 9 and 10, the valve connecting portion 600 is inserted into the spline connecting groove 310 of the rotating shaft 300 and splined up and down on the outer peripheral surface so as to be splined. The valve connection hole is formed in the same shape as the end of the valve shaft 13 so that the exposed end of the valve shaft 13 of the butterfly valve 10 is inserted and fitted into the valve connection portion 600. 610 is formed to penetrate vertically. For example, as shown in FIG. 9, the end of the valve shaft 13 is shown as a quadrangular shape on the plane cross section, but may be a pentagonal or hexagonal polygonal shape. Although not shown, it may be “D” -shaped. Further, as shown in FIG. 10, the end of the valve shaft 13 and the valve connection hole 610 of the valve connection part 600 may be key-coupled to each other.

  Through this, even if the end of the valve shaft 13 of the butterfly valve 10 has various shapes, it is only necessary to form the spline connecting groove 310 having the same shape and size on the lower surface of the rotating shaft 300, but only the valve connecting The valve connection hole 610 may be processed into a shape corresponding to the shape of the end of the valve shaft 13 through the portion 600.

  On the other hand, when the end portion of the valve shaft 13 of the butterfly valve 10 is circular on the plane cross section, the valve connecting hole 610 is also circular, so that the rotational force of the rotating shaft 300 is transmitted via the valve connecting portion 600 to the butterfly. There is a case where transmission to the valve shaft 13 of the valve 10 is impossible. At this time, it is not necessary to rework both into the above-described shape, and as shown in FIGS. 11 to 14, the valve connecting portion 600 can be constituted by the valve connector 620 and the fixed chuck 630, and the slide pin 640 and the spring can be formed. 650 may further be included.

  That is, as shown in FIG. 11, the valve connecting portion 600 is a cylinder that is splined (S) on the outer peripheral surface so as to be inserted into the spline connecting groove 310 of the rotating shaft 300 and splined. A plurality of slits 631 are formed in the upper and lower length direction along the periphery of a cylindrical valve connector 620 and a narrow upper and lower cylindrical shape, and can be pulled in and pulled out along the lower end internal length direction of the valve connector 620 And a fixed chuck 630 that is reduced in diameter when pulled into the lower end of the valve connector 620 and expanded in diameter when pulled out from the lower end of the valve connector 620. At this time, as shown in FIGS. 12 to 14, the end of the valve shaft 13 of the butterfly valve 10 is inserted into the fixed chuck 630, and at the same time, the fixed chuck 630 is connected to the valve connector 620. The diameter is reduced while being drawn into the lower end, and the outer peripheral surface of the inserted end portion of the valve shaft 13 is pressed and fixed.

  That is, the fixed chuck 630 has a cylindrical shape in which the upper diameter is narrower than the lower diameter, and a plurality of slits 631 are formed around the fixed chuck 630. The diameter is reduced, and when the force is removed, it expands to its original shape. Therefore, as shown in FIGS. 13 and 14, when the fixed chuck 630 is installed so as to be retractable / drawn along the internal length direction of the lower end of the valve connector 620, when retracted into the lower end of the valve connector 620, The fixed chuck 630 receives a force inward in the radial direction, and the diameter thereof is reduced. Further, when the fixed chuck 630 is pulled out from the inside of the lower end of the valve connector 620, the fixed chuck 630 is expanded to the original shape while removing the force in the radial direction.

  That is, as shown in FIGS. 12 to 14, the fixed chuck 630 is inserted into the valve shaft 13 of the butterfly valve 10 to move upward into the valve connector 620. At this time, the end of the valve shaft 13 is inserted into the fixed chuck 630, and at the same time, the fixed chuck 630 is inserted while being reduced in diameter while being pulled into the lower end of the valve connector 620. The outer peripheral surface of the end portion of the valve shaft 13 is pressed and fixed.

  Since the fixed chuck 630 is installed in the lower end of the valve connector 620 in relation to the valve connector 620 so that the fixed chuck 630 can be pulled and pulled out, a grip pin insertion hole 621 and a pin slide hole 632 are provided in the valve connector 620 and the fixed chuck 630, respectively. And a slide pin 640 is provided. That is, as shown in FIGS. 11 to 14, the valve connector 620 has a grip pin insertion hole 621 penetratingly formed on the outer peripheral surface of the lower end, and the fixed chuck 630 includes the valve connector 620. A pin slide hole 632 is formed through the outer peripheral surface along the vertical length direction so as to be longer than the grip pin insertion hole 621 and correspond to the grip pin insertion hole 621. At this time, the slide pin 640 is inserted up to the pin slide hole 632 of the fixed chuck 630 through the grip pin insertion hole 621 of the valve connector 620, and the height of the fixed chuck 630 is equal to the vertical length of the pin slide hole 632. The pull-in / pull-out distance with respect to the valve connector 620 is limited.

  The valve connector 620 and the fixed chuck 630 are coupled to each other by the slide pin 640. However, the pin slide hole 632 of the fixed chuck 630 is formed as a long hole vertically from the grip pin insertion hole 621 of the valve connector 620. Therefore, the fixed chuck 630 can be slid up and down with respect to the valve connector 620. The vertical sliding of the fixed chuck 630 with respect to the valve connector 620 is the same as the operation of being pulled into the lower end with respect to the valve connector 620 or being pulled out from the lower end.

  After the end of the valve shaft 13 is inserted into the fixed chuck 630, the fixed chuck 630 presses the outer peripheral surface of the end of the valve shaft 13 while the diameter of the fixed chuck 630 is reduced by the valve connector 620. It comes to fix firmly. On the other hand, when the valve connector 620 is lifted upward, the end of the valve shaft 13 inserted into the fixed chuck 630 is separated while the pressure from the fixed chuck 630 is released. At this time, when the diameter of the fixed chuck 630 is reduced, that is, when the fixed chuck 630 is pulled into the lower end of the valve connector 620, the valve connector 620 is disassembled for repair and replacement. And separation of the fixed chuck 630 can be difficult.

  In order to help the fixed chuck 630 be pulled out to the original position after being pulled into the valve connector 620 as described above, as shown in FIGS. 11 to 14, the fixed chuck 630 is installed inside the valve connector 620. A spring 650 may be further included to provide an elastic force in a direction in which the fixed chuck 630 is pulled out. Therefore, the fixed chuck 630 maintains the state of being pulled out from the valve connector 620 by the elastic force of the spring 650. When the valve shaft 13 is inserted into the fixed chuck 630 and is fixed by compression, the fixed chuck 630 630 overcomes the spring force of the spring 650 and is pulled into the lower end of the valve connector 620. Thereafter, when the valve shaft 13 is separated from the fixed chuck 630, the fixed chuck 630 is pulled out from the valve connector 620 through the spring force of the spring 650 together with the weight of the fixed chuck 630 itself or the elastic force of the slit 631. It can be so.

  As described above, the hydraulic rotary actuator for opening and closing the butterfly valve according to the present invention is manufactured in a cylindrical shape in which the cylinder 100 and the piston 200 are installed coaxially with the rotary shaft 300 by the upper cover 400 and the lower cover 500. As a result, the overall device becomes smaller and the space efficiency is improved compared to the type using the conventional rack and pinion mechanism and scotch yoke mechanism, and assembling and disassembling for installation and repair is easy. Since there is no interference with the piping and surrounding devices during the connection work with the ten valve shafts 13, the work efficiency in installation and maintenance can be greatly improved.

  In addition, a new connection structure is introduced through a valve connection portion 600 that has been splined (S) so that it can be easily replaced and converted according to the shapes of various valve shafts 13 of the butterfly valve 10. Regardless of the shape of 13, the rotation shaft 300 can have a fixed shape, and productivity can be improved.

  In particular, when the end portion of the valve shaft 13 of the butterfly valve 10 is circular, the valve connecting portion 600 is configured by the valve connector 620 and the fixed chuck 630, and the rotational force of the rotary shaft 300 can be controlled while being easily attached to and detached from the valve shaft. 13 can be accurately transmitted, 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 who have ordinary knowledge in the technical field of the present invention can improve and change the technical idea of the present invention into various forms. Is possible. Therefore, such improvements and modifications will be within the protection scope of the present invention as long as they are obvious to those having ordinary knowledge.

  As described above, the present invention is useful for a butterfly valve opening / closing hydraulic rotary actuator that is connected to an exposed valve shaft of a butterfly valve and opens and closes the butterfly valve by rotating the valve shaft of the butterfly valve by hydraulic operation. It is.

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 Rotating shaft 310 Spline connecting groove 320 Through hole 330 Display line 400 Upper cover 410 Upper cover hole 420 Upper hydraulic port 430 Display scale 500 Lower cover 510 Lower cover hole 520 Lower hydraulic port 600 Valve connecting portion 610 Valve connecting hole 620 Valve connector 621 Holding pin insertion hole 630 Fixed chuck 631 Slit 632 Pin slide hole 640 Slide pin 650 Spring 700 Stud bolt

  The present invention relates to a hydraulic rotary actuator, and more specifically, a butterfly valve opening / closing hydraulic pressure that is connected to an exposed valve shaft of a butterfly valve and opens and closes the butterfly valve by rotating the valve shaft of the butterfly valve by hydraulic operation. Relates to a rotary actuator.

  Generally, a valve is a device that controls the flow rate, flow rate, pressure, and the like of a fluid flowing in a pipe. Valves can be divided into many types according to the purpose, but butterfly valves are used in many industrial fields, especially to open or close the flow of various fluids such as industrial water, oil or seawater . Such a butterfly valve has advantages in that the opening and closing operation of the valve is smoother than other valves, the structure is simple, and the space utilization is good.

  As shown in FIG. 1, the butterfly valve 10 as described above is generally rotatable inside a valve body 11 and a valve body 11 installed on a conduit (not shown) for transferring a fluid. A disc-shaped disc 12 that opens and closes a pipe line, and is connected to the disc 12 to rotate the disc 12 and has a valve shaft 13 having one end exposed to the outside of the valve body 11. Is done. That is, when the valve shaft 13 exposed from the valve body 11 is rotated, the opening / closing operation is performed by the rotation of the disk 12 coupled to the valve shaft 13.

  In order to rotate the valve shaft 13, a rotation driving device is installed on the valve body 11, and a rotational force is transmitted to the valve shaft 13 through power transmission means by providing various power sources. For example, the power source may be a rotational force of a handle manually operated by an operator, a rotational force of an electric motor, or a rotational force transmitted from an actuator such as hydraulic pressure or pneumatic pressure. The power provided from such a power source must be transmitted as a rotational force to the valve shaft 13 through the power transmission means. As such power transmission means, various power transmission means such as a plurality of gear connections and mechanical link connections can be provided.

  For example, in the case of the “rubber butterfly valve” of Patent Document 1, it can be seen that the power source is the rotational force of the handle manually operated by the operator, and the power transmission means is a plurality of gear connections. In the case of the “rotary valve actuator” of Patent Document 2, the power source is the rotational force of the electric motor, and the power transmission means is a worm wheel gear connection. Here, when the handle is rotated by the manual operation, there is a big disadvantage that it is naturally limited to manual operation. When an electric motor is used, the capacity and size of the electric motor increase as the required power increases. As a result, the overall apparatus is enlarged, and complicated wiring and gear connection structures are required.

  In order to solve such a problem, a hydraulic rotary actuator is used which has a quick response with mechanical force such as hydraulic pressure and can output a large force while downsizing the apparatus. That is, the hydraulic rotary actuator is a device that reciprocates the piston linearly using hydraulic pressure, transmits the linear motion to an output shaft connected to the piston, and converts the linear motion into a rotational motion. The movement is transmitted to the valve shaft 13 of the butterfly valve 10 to open and close the disk 12 of the butterfly valve 10.

  The hydraulic rotary actuator as described above uses hydraulic pressure as a power source, and a rack and pinion mechanism and a scotch yoke mechanism have been mainly used as power transmission means. That is, as shown in FIG. 2, the rack and pinion mechanism 20 includes a pair of cylinders 21 provided on both the left and right sides, a pair of pistons 23 each built in the cylinder 21 and having a rack gear 22 formed in the center, A rotation shaft 25 having a pinion gear 24 formed so as to mesh with the rack gear 22 and rotate is configured. Further, as shown in FIG. 3, the scotch yoke mechanism 30 includes a pair of cylinders 31 provided on the left and right sides, and a pair of pistons 33 each formed in the cylinder 31 and having a scotch 32 protruding in the center. And a rotating shaft 35 on which a yoke 34 is formed to be coupled to the scotch 32 and rotate.

  However, since the rack and pinion mechanism 20 and the scotch yoke mechanism 30 described above each include a pair of cylinders 21 and 31 and pistons 23 and 33, the overall apparatus becomes large and space utilization is reduced. There is a problem that the manufacturing unit price increases. Therefore, as in Patent Documents 3 to 5, a single piston is installed inside one cylinder, and a rotating shaft is inserted coaxially with the piston, and the rotation is performed in conjunction with the vertical movement of the piston. By rotating the shaft forward and backward, the overall size of the device is reduced, space utilization is improved, and the manufacturing unit price can be dramatically reduced.

  At this time, the rotary shaft of the hydraulic rotary actuator as described above must be connected to the valve shaft 13 of the butterfly valve 10. Generally, the valve is manufactured by a valve manufacturing company, and the actuator is separately manufactured by an actuator manufacturing company. Since they are manufactured, there is a problem in that both have various shapes, dimensions, and tolerances according to manufacturing companies, products, and sizes. Therefore, in order to couple them together, the actuator manufacturing company has to process the rotary shaft of the actuator into various shapes according to the valve shaft 13 of the butterfly valve 10 delivered from the valve manufacturing company. There's a problem.

Korean Published Patent No. 10-2002-0003769 Korean Registered Patent No. 10-0482906 Korean Registered Patent No. 10-055489 Korean Registered Patent No. 10-0578538 Korean Registered Patent No. 10-1424423

  The object of the present invention, which has been made to solve the above-described problems, is to improve the productivity by having a rotating shaft having a fixed shape regardless of the shape of the valve shaft of various butterfly valves. Another object of the present invention is to provide a hydraulic rotary actuator for opening and closing a butterfly valve in which a new connection structure is introduced through a valve connecting portion that can be easily replaced and converted according to various valve shaft shapes of the butterfly valve.

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

  In order to achieve the above-mentioned object, a hydraulic rotary actuator for opening and closing a butterfly valve according to the present invention includes a cylindrical cylinder that is opened up and down, and a shaft hole that is formed through the center. The piston inserted and reciprocated up and down inside the cylinder by hydraulic supply and discharge, and inserted through the shaft hole of the piston and rotated in the forward and reverse directions by the up and down reciprocation of the piston, A rotary shaft having a spline connecting groove recessed upward, and an upper cover coupled to the upper portion of the cylinder and having an upper cover hole inserted and inserted into the outer peripheral surface of the upper end of the rotary shaft. The lower cover ho that is coupled to the lower part of the cylinder and is rotatably supported by inserting the outer peripheral surface of the lower end of the rotating shaft. And a valve connecting part that is splined so as to be inserted into the spline connecting groove of the rotating shaft, and an exposed end of the valve shaft is inserted and connected to the inside of the rotating shaft. It is characterized by including.

Further, the upper cover is provided with an upper hydraulic port for supplying hydraulic pressure to the inside of the cylinder above the piston or discharging the hydraulic pressure from the cylinder, and the lower cover is provided with the hydraulic pressure below the piston. A lower hydraulic port for supplying hydraulic pressure to the inside of the cylinder and discharging hydraulic pressure from the cylinder is formed.

  Further, the cylinder is formed with a pair of fastening holes facing the outer periphery so that a guide pin for guiding the vertical reciprocating motion of the piston is inserted and fastened, and the guide pin is inserted into the piston. A pair of guide slits are formed through the outer periphery so as to reciprocate up and down with respect to the cylinder as a reference, and a rotate pin for guiding the rotational movement of the rotating shaft is inserted and fastened. A pair of rotating slits that are diagonally opposed to each other are formed through the outer periphery of the rotating shaft, and the rotating pin is inserted through the rotating shaft. As described above, a through hole is formed through the outer periphery.

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

  The upper cover and the lower cover may be coupled to each other by a plurality of stud bolts.

  A display line for displaying a 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 of the upper cover by the rotation angle of the rotation shaft. It is characterized by that.

  In addition, the valve connecting portion is inserted into the spline connecting groove of the rotating shaft and splined up and down on the outer peripheral surface so as to be splined, and the valve connecting portion includes a valve exposed to the butterfly valve. A valve connecting hole is formed in the same shape as the shape of the end of the valve shaft so that the end of the shaft is inserted and fitted.

  Further, the end of the valve shaft has a polygonal shape or a “D” shape on a flat cross section.

  The valve shaft end and the valve connection hole of the valve connection portion are key-coupled to each other.

  In addition, the end of the valve shaft of the butterfly valve has a circular shape on a flat cross section, and the valve connecting portion is inserted into the spline connecting groove of the rotating shaft so as to be splined up and down on the outer peripheral surface. A plurality of slits are formed in the vertical length direction along the circumference on the upper and lower cylinders, and drawn in along the inner length direction of the lower end of the valve connector. A fixed chuck that can be pulled out and has a diameter that is reduced when the valve connector is pulled into the lower end of the valve connector, and a diameter that is expanded when the valve connector is pulled out from the lower end of the valve connector. At the same time as the end of the valve shaft of the butterfly valve is inserted, the fixed chuck is retracted into the lower end of the valve connector. Which while being reduced in diameter, characterized in that compressed and secured to the outer peripheral surface of the end portion of the inserted the valve shaft.

  In addition, a grip pin insertion hole is formed through the outer peripheral surface of the lower end of the valve connector toward the inside, and the fixed chuck is longer than the grip pin insertion hole of the valve connector. A pin slide hole is formed through the outer peripheral surface along the vertical direction so as to correspond to the hole, and the valve connecting portion is inserted to the pin slide hole of the fixed chuck through the grip pin insertion hole of the valve connector. The slide pin further includes a slide pin that limits a pull-in / pull-out distance of the fixed chuck with respect to the valve connector by a vertical length of the pin slide hole.

  The valve connecting part may further include a spring that is installed inside the valve connector and provides an elastic force in a direction in which the fixed chuck is pulled out.

  The hydraulic rotary actuator for opening and closing the butterfly valve according to the present invention introduces a new connection structure through a spline-processed valve connection part so that it can be easily replaced and converted according to the shape of various valve shafts of the butterfly valve, Regardless of the shape of the valve shaft of the butterfly valve, it is possible to have a rotating shaft with a fixed shape, and productivity can be improved.

  In particular, when the end of the valve shaft of the butterfly valve is circular, the valve connecting portion is composed of a valve connector and a fixed chuck, and the torque of the rotating shaft can be accurately transmitted to the valve shaft while being easily attached to and detached from each other. And reliability and durability can be improved.

FIG. 1 is a perspective view showing a general butterfly valve. FIG. 2 is a partially cut perspective view showing a rack and pinion type hydraulic rotary actuator according to the prior art. FIG. 3 is a partially cut perspective view showing a scotch yoke type hydraulic rotary actuator according to the prior art. FIG. 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 cut perspective view showing the main part of the embodiment of FIG. FIG. 6 is an exploded perspective view of the embodiment of FIG. FIG. 7 is a perspective view of the main part showing the rotational movement of the rotary shaft interlocked with the vertical movement of the piston in the embodiment of FIG. FIG. 8 is a perspective view of the main part showing the rotational movement of the rotary shaft that is linked by the vertical movement of the piston in the embodiment of FIG. FIG. 9 is a perspective view showing a main part of 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. FIG. 10 is a main part 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. FIG. 11 is a perspective view of the essential part 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. FIG. 12 is a side sectional view showing a state where the embodiment of FIG. 11 is combined. FIG. 13 is a side sectional view showing an operation process of the valve connecting portion in the embodiment of FIG. FIG. 14 is a side sectional view showing an operation process of the valve connecting portion 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.

  A hydraulic rotary actuator for opening and closing a butterfly valve according to the present invention includes a cylinder 100, a piston 200, a rotating shaft 300, an upper cover 400, a lower cover 500, and a valve as shown in FIGS. The connection part 600 may be included, and the stud bolt 700 may be further included. In addition, a guide pin 110 and a rotate pin 230 may be further included to rotate in conjunction with the rotation shaft 300 according to the vertical movement of the piston 200.

  As shown in FIGS. 4 to 6, the cylinder 100 has a cylindrical shape opened up and down, and a piston 200 described later is installed therein, and the piston 200 reciprocates up and down by hydraulic operation. It is. That is, the cylinder 100 is manufactured in a cylindrical shape with an upper portion and a lower portion opened, and a piston 200 and a rotating shaft 300 described later are installed inside. The cylinder 100 is formed with a pair of fastening holes 120 that are opposed to the outer periphery so that the guide pins 110 that prevent the piston 200 from rotating and guide the reciprocating motion of the piston 200 are inserted and fastened. The The cylinder 100 is closed at the upper and lower portions opened by the upper cover 400 and the lower cover 500 together with the rotating shaft 300 described later.

  At this time, a female screw and a male screw are respectively formed in a pair of fastening holes 120 and guide pins 110 formed through the cylinder 100 so that the guide pins 110 are screw-coupled to the fastening holes 120. 120 is provided with packing means (not shown) so that the hydraulic pressure supplied to the inside of the cylinder 100 or discharged from the cylinder 100 does not leak between the coupling surfaces of the guide pin 110 and the fastening hole 120. .

  As shown in FIGS. 5 to 8, the piston 200 has a shaft hole 210 penetratingly formed at the center thereof, inserted into the cylinder 100, and reciprocated up and down within the cylinder 100 by supplying and discharging hydraulic pressure. To do. That is, the piston 200 is vertically reciprocated in the cylinder 100 by the hydraulic pressure supplied to the cylinder 100 or discharged from the cylinder 100, and the shaft 200 is inserted into the piston 200 so that the rotating shaft 300 is inserted. 210 is formed through.

  4 to 8, the rotating 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 vertical reciprocating motion of the piston 200. Thus, the spline connecting groove 310 is formed to be depressed upward. The spline connecting groove 310 is configured to transmit the rotational force of the rotary shaft 300 to the valve shaft 13 via the valve connecting portion 600 in relation to the valve connecting portion 600 described later. As shown in FIGS. 7 and 8, the rotary shaft 300 rotates in the forward and reverse directions in conjunction with the up and down reciprocating motion of the piston 200. The rotating shaft 300 includes a guide pin 110 and a rotate pin 230, and a fastening hole 120, a guide slit 220, a rotate slit 240, and a through hole 320 are formed, respectively.

  More specifically, the piston 200 includes a pair of guide slits 220 that are inserted in the piston 200 and face the outer periphery along the vertical length direction so as to reciprocate up and down with respect to the cylinder 100. A pair of rotate slits 240 are formed in a penetrating manner so as to be diagonally opposed to the outer periphery so that a rotate pin 230 is inserted and fastened to guide the rotational movement of the rotary shaft 300.

  That is, the piston 200 is manufactured in a cylindrical shape whose upper and lower sides are opened by the shaft hole 210, and a guide slit 220 and a rotate slit 240 are perforated on the outer peripheral surface, and the outer diameter is approximately the inner diameter of the cylinder 100. It is manufactured as small as 0.1 mm or less, and facilitates vertical reciprocation by hydraulic pressure supplied to the cylinder 100 or discharged from the cylinder 100. In other words, the piston 200 does not rotate by the guide slit 220 drilled in the vertical direction so that the guide pin 110 fastened to the fastening hole 120 of the cylinder 100 is slid. To do. At this time, the piston 200 is moved into the cylinder 100 as shown in FIG. 7 by the rotation slit 240 that is perforated so that the rotation pin 230 inserted into the through hole 320 of the rotating shaft 300 is slid. In the case of ascending vertically, the rotation shaft 300 rotates in the forward direction (or clockwise direction) while the rotation pin 230 moves to the lowest end of the rotation slit 240. On the other hand, when the piston 200 descends vertically in the cylinder 100 as shown in FIG. 8, the rotation shaft 300 moves in the reverse direction (or while the rotation pin 230 moves to the uppermost end of the rotation slit 240. Rotate counterclockwise. That is, the rotation pin 230 is inserted through the rotary shaft 300, and the through hole 320 is formed on the outer periphery so as to rotate in the forward and reverse directions with respect to the piston 200 in conjunction with the vertical reciprocation of the piston 200. Is formed through.

  At this time, the rotation slit 240 of the piston 200 is perforated in a slanted line shape or a spiral shape having an inclination angle of 20 ° to 60 °, and the rotation pin 230 inserted through the rotating shaft 300 is inserted into the rotation slit 300. When reaching the lowermost end and the uppermost end of 240, the rotation angle of the rotary shaft 300 is limited to 90 °. That is, the rotation shaft 300 has a rotation angle of 90 ° with respect to the piston 200, and the butterfly valve 10 shown in FIG. 1 or not shown in the drawing for opening and closing the valve like a ball valve. The valve shaft 13 can be applied to a valve whose rotation angle is 90 °.

  In other words, the rotation slit 240 restricts the rotation angle of the rotary shaft 300 to 90 °, and is connected to the stroke that is the vertical movement distance of the piston 200 and the valve shaft 13 by the oblique line angle between the lowermost end and the uppermost end. The output torque of the rotating shaft 300 changes. That is, the smaller the oblique line angle of the rotate slit 240, the shorter the stroke of the piston 200 and the smaller the output torque of the rotating shaft 300. The stroke means a one-way distance of the piston 200 that reciprocates vertically in the cylinder 100, and the output torque of the rotary shaft 300 increases as the stroke of the piston 200 increases. Therefore, the hydraulic rotary actuator for opening and closing the butterfly valve according to the present invention can be manufactured by changing the oblique line angle of the rotate slit 240 according to the required output torque and the size of the cylinder 100.

  On the other hand, the side surface of the piston 200 is provided with an O-ring made of silicon or rubber, and by increasing the adhesion with the cylinder 100, the hydraulic pressure supplied to or discharged from the cylinder 100 is increased. The vertical reciprocation of the piston 200 is facilitated.

  As shown in FIGS. 4 to 6, the upper cover 400 is coupled to the upper portion of the cylinder 100, and the upper cover 400 is rotatably supported by inserting the outer peripheral surface of the upper end of the rotating shaft 300. A hole 410 is formed through. The lower cover 500 is coupled to the lower portion of the cylinder 100, and the lower cover 500 is formed with a lower cover hole 510 through which the outer peripheral surface of the lower end of the rotary shaft 300 is inserted to be rotatably supported. At this time, the rotating shaft 300 may be provided with a thrust bearing 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, respectively.

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

  On the other hand, a display line 330 for displaying a rotation angle is formed on the upper surface of the rotation shaft 300, and a display corresponding to the display line 330 by the rotation angle of the rotation shaft 300 is formed on the upper surface of the upper cover 400. A scale 430 may be formed. Through such display lines 330 and display scales 430, the operator can easily confirm with the naked eye the rotation direction of the rotary shaft 300 and whether or not the butterfly valve 10 is opened or closed.

  The butterfly valve opening / closing hydraulic rotary actuator according to the present invention described above with reference to FIG. 5 through the above-described configuration, as shown in FIG. 7, the rotation of the rotation shaft 300 in the positive direction (or clockwise direction) is the butterfly valve. When it is required to close the butterfly valve 10 as linked to the closing of the upper cover 10, the hydraulic pressure is supplied to the lower hydraulic port 520 formed in the lower cover 500 and the hydraulic pressure is supplied from the upper hydraulic port 420 of the upper cover 400. Is discharged. As a result, the piston 200 rises in the cylinder 100 without rotating by the guide pin 110 and the guide slit 220, and the rotate pin 230 pierced and fastened to the rotating shaft 300 slides to the lowest end of the rotate slit 240. However, the rotary shaft 300 and the valve shaft 13 of the butterfly valve 10 connected thereto rotate in the forward direction, and the butterfly valve 10 performs a closing operation.

  On the other hand, as shown in FIG. 8, if it is required to open the butterfly valve 10 on the assumption that the reverse (or counterclockwise) rotation of the rotary shaft 300 is linked to the opening of the butterfly valve 10, Hydraulic pressure is supplied to the upper hydraulic pressure port 420 formed in the cover 400, and hydraulic pressure is discharged from the lower hydraulic pressure port 520 of the lower cover 500. As a result, 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 penetratingly fastened to the rotation shaft 300 slides to the uppermost end of the rotation slit 240. However, the rotary shaft 300 and the valve shaft 13 of the butterfly valve 10 connected thereto rotate in the reverse direction, and the butterfly valve 10 opens.

  As shown in FIGS. 4, 6, and 9 to 14, the valve connecting part 600 is splined so as to be inserted into the spline connecting groove 310 of the rotating shaft 300, and the butterfly valve 10 is exposed. The end of the valve shaft 13 is inserted and coupled to the inside. As a result, the rotational force of the piston 200 that moves up and down inside the cylinder 100 and the rotating shaft 300 that rotates in conjunction with the piston 200 is transmitted to the valve shaft 13 of the butterfly valve 10 via the valve connecting portion 600, and the butterfly valve. 10 can be opened and closed.

  At this time, as shown in FIGS. 9 and 10, the valve connecting portion 600 is inserted into the spline connecting groove 310 of the rotating shaft 300 and splined up and down on the outer peripheral surface so as to be splined. The valve connection hole is formed in the same shape as the end of the valve shaft 13 so that the exposed end of the valve shaft 13 of the butterfly valve 10 is inserted and fitted into the valve connection portion 600. 610 is formed to penetrate vertically. For example, as shown in FIG. 9, the end of the valve shaft 13 is shown as a quadrangular shape on the plane cross section, but may be a pentagonal or hexagonal polygonal shape. Although not shown, it may be “D” -shaped. Further, as shown in FIG. 10, the end of the valve shaft 13 and the valve connection hole 610 of the valve connection part 600 may be key-coupled to each other.

  Through this, even if the end of the valve shaft 13 of the butterfly valve 10 has various shapes, it is only necessary to form the spline connecting groove 310 having the same shape and size on the lower surface of the rotating shaft 300, but only the valve connecting The valve connection hole 610 may be processed into a shape corresponding to the shape of the end of the valve shaft 13 through the portion 600.

  On the other hand, when the end portion of the valve shaft 13 of the butterfly valve 10 is circular on the plane cross section, the valve connecting hole 610 is also circular, so that the rotational force of the rotating shaft 300 is transmitted via the valve connecting portion 600 to the butterfly. There is a case where transmission to the valve shaft 13 of the valve 10 is impossible. At this time, it is not necessary to rework both into the above-described shape, and as shown in FIGS. 11 to 14, the valve connecting portion 600 can be constituted by the valve connector 620 and the fixed chuck 630, and the slide pin 640 and the spring can be formed. 650 may further be included.

  That is, as shown in FIG. 11, the valve connecting portion 600 is a cylinder that is splined (S) on the outer peripheral surface so as to be inserted into the spline connecting groove 310 of the rotating shaft 300 and splined. A plurality of slits 631 are formed in the upper and lower length direction along the periphery of a cylindrical valve connector 620 and a narrow upper and lower cylindrical shape, and can be pulled in and pulled out along the lower end internal length direction of the valve connector 620 And a fixed chuck 630 that is reduced in diameter when pulled into the lower end of the valve connector 620 and expanded in diameter when pulled out from the lower end of the valve connector 620. At this time, as shown in FIGS. 12 to 14, the end of the valve shaft 13 of the butterfly valve 10 is inserted into the fixed chuck 630, and at the same time, the fixed chuck 630 is connected to the valve connector 620. The diameter is reduced while being drawn into the lower end, and the outer peripheral surface of the inserted end portion of the valve shaft 13 is pressed and fixed.

  That is, the fixed chuck 630 has a cylindrical shape in which the upper diameter is narrower than the lower diameter, and a plurality of slits 631 are formed around the fixed chuck 630. The diameter is reduced, and when the force is removed, it expands to its original shape. Therefore, as shown in FIGS. 13 and 14, when the fixed chuck 630 is installed so as to be retractable / drawn along the internal length direction of the lower end of the valve connector 620, when retracted into the lower end of the valve connector 620, The fixed chuck 630 receives a force inward in the radial direction, and the diameter thereof is reduced. Further, when the fixed chuck 630 is pulled out from the inside of the lower end of the valve connector 620, the fixed chuck 630 is expanded to the original shape while removing the force in the radial direction.

  That is, as shown in FIGS. 12 to 14, the fixed chuck 630 is inserted into the valve shaft 13 of the butterfly valve 10 to move upward into the valve connector 620. At this time, the end of the valve shaft 13 is inserted into the fixed chuck 630, and at the same time, the fixed chuck 630 is inserted while being reduced in diameter while being pulled into the lower end of the valve connector 620. The outer peripheral surface of the end portion of the valve shaft 13 is pressed and fixed.

  Since the fixed chuck 630 is installed in the lower end of the valve connector 620 in relation to the valve connector 620 so that the fixed chuck 630 can be pulled and pulled out, a grip pin insertion hole 621 and a pin slide hole 632 are provided in the valve connector 620 and the fixed chuck 630, respectively. And a slide pin 640 is provided. That is, as shown in FIGS. 11 to 14, the valve connector 620 has a grip pin insertion hole 621 penetratingly formed on the outer peripheral surface of the lower end, and the fixed chuck 630 includes the valve connector 620. A pin slide hole 632 is formed through the outer peripheral surface along the vertical length direction so as to be longer than the grip pin insertion hole 621 and correspond to the grip pin insertion hole 621. At this time, the slide pin 640 is inserted up to the pin slide hole 632 of the fixed chuck 630 through the grip pin insertion hole 621 of the valve connector 620, and the height of the fixed chuck 630 is equal to the vertical length of the pin slide hole 632. The pull-in / pull-out distance with respect to the valve connector 620 is limited.

  The valve connector 620 and the fixed chuck 630 are coupled to each other by the slide pin 640. However, the pin slide hole 632 of the fixed chuck 630 is formed as a long hole vertically from the grip pin insertion hole 621 of the valve connector 620. Therefore, the fixed chuck 630 can be slid up and down with respect to the valve connector 620. The vertical sliding of the fixed chuck 630 with respect to the valve connector 620 is the same as the operation of being pulled into the lower end with respect to the valve connector 620 or being pulled out from the lower end.

  After the end of the valve shaft 13 is inserted into the fixed chuck 630, the fixed chuck 630 presses the outer peripheral surface of the end of the valve shaft 13 while the diameter of the fixed chuck 630 is reduced by the valve connector 620. It comes to fix firmly. On the other hand, when the valve connector 620 is lifted upward, the end of the valve shaft 13 inserted into the fixed chuck 630 is separated while the pressure from the fixed chuck 630 is released. At this time, when the diameter of the fixed chuck 630 is reduced, that is, when the fixed chuck 630 is pulled into the lower end of the valve connector 620, the valve connector 620 is disassembled for repair and replacement. And separation of the fixed chuck 630 can be difficult.

  In order to help the fixed chuck 630 be pulled out to the original position after being pulled into the valve connector 620 as described above, as shown in FIGS. 11 to 14, the fixed chuck 630 is installed inside the valve connector 620. A spring 650 may be further included to provide an elastic force in a direction in which the fixed chuck 630 is pulled out. Therefore, the fixed chuck 630 maintains the state of being pulled out from the valve connector 620 by the elastic force of the spring 650. When the valve shaft 13 is inserted into the fixed chuck 630 and is fixed by compression, the fixed chuck 630 630 overcomes the spring force of the spring 650 and is pulled into the lower end of the valve connector 620. Thereafter, when the valve shaft 13 is separated from the fixed chuck 630, the fixed chuck 630 is pulled out from the valve connector 620 through the spring force of the spring 650 together with the weight of the fixed chuck 630 itself or the elastic force of the slit 631. It can be so.

  As described above, the hydraulic rotary actuator for opening and closing the butterfly valve according to the present invention is manufactured in a cylindrical shape in which the cylinder 100 and the piston 200 are installed coaxially with the rotary shaft 300 by the upper cover 400 and the lower cover 500. As a result, the overall device becomes smaller and the space efficiency is improved compared to the type using the conventional rack and pinion mechanism and scotch yoke mechanism, and assembling and disassembling for installation and repair is easy. Since there is no interference with the piping and surrounding devices during the connection work with the ten valve shafts 13, the work efficiency in installation and maintenance can be greatly improved.

  In addition, a new connection structure is introduced through a valve connection portion 600 that has been splined (S) so that it can be easily replaced and converted according to the shapes of various valve shafts 13 of the butterfly valve 10. Regardless of the shape of 13, the rotation shaft 300 can have a fixed shape, and productivity can be improved.

  In particular, when the end portion of the valve shaft 13 of the butterfly valve 10 is circular, the valve connecting portion 600 is configured by the valve connector 620 and the fixed chuck 630, and the rotational force of the rotary shaft 300 can be controlled while being easily attached to and detached from the valve shaft. 13 can be accurately transmitted, 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 who have ordinary knowledge in the technical field of the present invention can improve and change the technical idea of the present invention into various forms. Is possible. Therefore, such improvements and modifications will be within the protection scope of the present invention as long as they are obvious to those having ordinary knowledge.

  As described above, the present invention is useful for a butterfly valve opening / closing hydraulic rotary actuator that is connected to an exposed valve shaft of a butterfly valve and opens and closes the butterfly valve by rotating the valve shaft of the butterfly valve by hydraulic operation. It is.

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 Rotating shaft 310 Spline connecting groove 320 Through hole 330 Display line 400 Upper cover 410 Upper cover hole 420 Upper hydraulic port 430 Display scale 500 Lower cover 510 Lower cover hole 520 Lower hydraulic port 600 Valve connecting portion 610 Valve connecting hole 620 Valve connector 621 Holding pin insertion hole 630 Fixed chuck 631 Slit 632 Pin slide hole 640 Slide pin 650 Spring 700 Stud bolt

Claims (12)

A cylindrical cylinder open up and down;
A shaft hole is formed through the center, inserted into the cylinder, and reciprocated up and down inside the cylinder by supplying and discharging hydraulic pressure, and
A rotary shaft inserted through the shaft hole of the piston, rotating in the forward and reverse directions in conjunction with the up-and-down reciprocating motion of the piston, and having a spline connection groove formed in a recessed manner on the lower surface;
An upper cover that is coupled to the upper part of the cylinder and has an upper cover hole that is inserted into the outer peripheral surface of the upper end of the rotating shaft and supported to rotate;
A lower cover that is coupled to a lower portion of the cylinder and has a lower cover hole that is inserted and rotated at the outer peripheral surface of the lower end of the rotation shaft;
A butterfly valve comprising: a valve coupling portion that is splined so as to be inserted into a spline coupling groove of the rotating shaft, and an end portion of an exposed valve shaft of the butterfly valve is inserted and coupled therein. Hydraulic rotary actuator for opening and closing. In the cylinder,
A pair of fastening holes facing the outer periphery are formed so as to be inserted and fastened so that guide pins for guiding the vertical reciprocation of the piston are inserted and fastened,
In the piston,
A pair of guide slits are formed in the outer periphery so as to reciprocate up and down with respect to the cylinder as a reference, and a pair of guide slits are formed through the outer periphery so as to guide the rotational movement of the rotating shaft. A pair of rotating slits that are diagonally opposed to the outer periphery are formed so as to be inserted and fastened,
The rotating shaft includes
The through hole is formed in the outer periphery of the rotation pin so that the rotation pin is inserted into the outer periphery of the rotation pin so as to rotate in the forward and reverse directions with respect to the piston in conjunction with the vertical reciprocation of the piston. The hydraulic rotary actuator for opening and closing a butterfly valve according to 1. The rotation axis is
The hydraulic rotary actuator for opening and closing a butterfly valve according to claim 2, wherein a rotation angle is 90 degrees with respect to the piston. The upper cover includes
An upper hydraulic port for supplying hydraulic pressure to the inside of the cylinder or discharging the hydraulic pressure from the cylinder is formed above the piston.
In the lower cover,
The hydraulic rotary for opening and closing a butterfly valve according to claim 1, wherein a lower hydraulic port for supplying hydraulic pressure to the inside of the cylinder or discharging hydraulic pressure from the cylinder is formed below the piston. Actuator. The upper cover and the lower cover are
The hydraulic rotary actuator for opening and closing a butterfly valve according to claim 1, wherein the hydraulic rotary actuators are connected to each other by a plurality of stud bolts. The rotating shaft includes
A display line for displaying the rotation angle on the upper surface is formed,
The upper cover includes
2. The hydraulic rotary actuator for opening and closing a butterfly valve according to claim 1, wherein a display scale corresponding to the display line is formed on an upper surface by a rotation angle of the rotation shaft.   The valve connecting part is inserted into the spline connecting groove of the rotating shaft and splined up and down on the outer peripheral surface so as to be connected to the spline. The hydraulic rotary for opening and closing a butterfly valve according to claim 1, wherein a valve connecting hole is vertically formed in the same shape as the shape of the valve shaft end so that the portion is inserted and fitted. Actuator. The end of the valve shaft is
The hydraulic rotary actuator for opening and closing a butterfly valve according to claim 7, wherein the hydraulic rotary actuator has a polygonal shape or a “D” shape on a flat cross section.   8. The hydraulic rotary actuator for opening and closing a butterfly valve according to claim 7, wherein an end portion of the valve shaft and a valve connection hole of the valve connection portion are key-coupled to each other. The end of the valve shaft of the butterfly valve is
Is circular on a flat section,
The valve connecting portion is
A cylindrical valve connector that is inserted into the spline connecting groove of the rotating shaft and splined up and down on the outer peripheral surface so as to be splined;
A plurality of slits are formed in the upper and lower longitudinal directions along the periphery of the upper and lower cylinders, and are installed so as to be retractable / drawn along the lower end internal length direction of the valve connector. A fixed chuck that is reduced in diameter when retracted into the interior and expanded in diameter when retracted from within the lower end of the valve connector;
At the same time that the end of the valve shaft of the butterfly valve is inserted into the fixed chuck, the diameter of the fixed chuck is reduced while being pulled into the lower end of the valve connector. 2. The hydraulic rotary actuator for opening and closing a butterfly valve according to claim 1, wherein the outer peripheral surface of the end portion is pressed and fixed. The valve connector includes
A grip pin insertion hole is formed through the outer peripheral surface of the lower end toward the inside,
The fixed chuck includes
It is a long hole longer than the grip pin insertion hole of the valve connector, and a pin slide hole is formed through the outer peripheral surface along the vertical length direction so as to correspond to the grip pin insertion hole.
The valve connecting portion is
A slide pin that is inserted to the pin slide hole of the fixed chuck through the grip pin insertion hole of the valve connector, and further restricts the distance of the fixed chuck to the valve connector by the vertical length of the pin slide hole. The hydraulic rotary actuator for opening and closing a butterfly valve according to claim 10, comprising: The valve connecting portion is
The hydraulic rotary actuator for opening and closing a butterfly valve according to claim 11, further comprising a spring installed inside the valve connector and providing an elastic force in a direction in which the fixed chuck is pulled out.

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