JP5307879B2 - Scotch yoke type operation device - Google Patents

Description

  The present invention relates to a scotch-yoke type operating device that uses air pressure as a power source in an operating device for operating a valve provided in a pipeline or the like.

  As a valve operating device provided in a pipeline or the like, a scotch yoke type operating device that can be used in an emergency state includes a spring as shown in FIG. In the operating device shown in FIG. 3, a main rod 3 provided with a pin 34 that engages with a longitudinal groove 22 of a scotch yoke 2 attached to a valve stem 12 disposed in a casing 16, this main rod is in the illustrated state. The actuator 4 on one side and the actuator 5 on the other side of the main rod 3 to be moved horizontally are provided, and when opening the valve, the air pipe 7 is connected to the same side of the pistons 42 and 52 of both actuators 4 and 5. The air pressure is supplied to move the main rod 3 to the left side of the figure. Further, in the event of an emergency, when air pressure is not supplied, a spring 55 ″ for biasing the piston 52 is provided inside the actuator 5 on the other side in order to move the left main rod 3 to the right. Further, in order to open the valve by moving the main rod 3 to the left side by the hydraulic pressure of the piston 42 to the flange 46 in case the air pressure cannot be supplied to the actuator 4 on one side. A cylindrical body 66 ′ is provided, and a piston 62 ′ is actuated by hydraulic pressure from a hydraulic inlet / outlet 48 of the hydraulic flange 47 at the right end portion thereof.

  In the state of the valve shown in FIG. 3, the rotary valve (mainly the ball valve) is in a closed state and the spring 55 ′ is also extended, but in this state, the valve is urgently closed for some request. When operating, the air acting on the cylinder is extracted and the valve is closed using spring force. However, when these operating devices are enlarged, it is difficult to open and close the lever or gear system when there is no air source. As described above, the hydraulic cylinder 64 ′ is provided outside the one actuator 4.

  Further, as a conventional device, there is an operation device as shown in FIG. 4, but the spring 43 of the device of FIG. 3 is provided inside the cylinder 45 of one actuator, and further, a hydraulic cylinder 64 ′, A hydraulic piston 62 ′ is provided, and hydraulic pressure is supplied into the cylinder 64 ′ so as to move the piston 42 ′ through the flange 46 ′, and the pinstone 42 ′ moves the main rod 3 to the left against the spring 43. Open the valve.

  Furthermore, although an operating device as shown in FIG. 5 is implemented, since each actuator is provided on the left and right due to its relatively large size, the manual opening / closing means in an emergency becomes large, so the diameter of the cylinder of the actuator is reduced. In FIG. 5, the main rod 3 is moved by supplying and discharging air pressure supply holes 42 ′ and 44 ′ to both sides of the piston of the actuator 4 ′ consisting of the right cylinder and piston, thereby opening and closing the valve. In addition, there is an actuator that is opened and closed by providing an actuator by a hydraulic cylinder on the left side for manual operation such as in an emergency.

  Since the manual operation means as shown in FIG. 3 to FIG. 5 is composed of a cylinder and a piston for hydraulic operation, the manual operation means is provided in the cylinder with a cylinder length applied to a normal piston stroke. A length longer than the stroke of the piston is required, which is uneconomical and causes structural problems in design.

  The present invention has been made in view of the above problems, and it is possible to provide manual operation means while maintaining the function in the same apparatus without changing the lengths of the actuators provided on both sides for swinging the scotch yoke. An object of the present invention is to provide a scotch yoke type operating device.

To achieve the above object, a Scotch yoke type operating device according to the present invention is a Scotch yoke type operating device for operating a valve,
The main rod for swinging the scotch yoke by rotating the valve stem that operates the valve is fixed to the piston that reciprocates in the cylinder, so that the air pressure can always be operated in the valve opening or closing direction. A pneumatic actuator is provided, and a spring is provided between the piston of the pneumatic actuator and a flange for closing the cylinder so as to urge the valve in a normally open or closed direction. In the Scotch yoke type operation device that can operate the valve by swinging the Scotch yoke by the repulsive force of the spring by removing the acting air pressure,
A cavity having a predetermined diameter and length is provided on the piston side of the main rod, and the main rod is formed in the cavity so as to form a hydraulic actuator on a flange that closes the cylinder opposite to the flange that supports the spring. A secondary rod is provided so that the rod slides and reciprocates, a communication hole is provided between the fixed end of the secondary rod and a free end, and the flange that fixes the secondary rod is provided on the flange. A hydraulic inlet / outlet communicating with the communication hole and an oil flange provided with an air vent are attached, and the piston can be operated to compress the spring by the supplied hydraulic pressure.

  In the Scotch yoke type operating device, the main rod is formed of a cylindrical bar having the same diameter in the axial direction.

  Further, in the Scotch yoke type operating device, a portion that is provided between the piston and a flange that closes an end of the cylinder, and that operates as a hydraulic actuator of the main rod inside a spring along the inner periphery of the cylinder. Is provided.

  Further, in the Scotch yoke type operating device, the diameter of the portion of the main rod with which the sub rod is fitted is larger than the diameter of other portions as necessary so as to increase the torque of the hydraulic actuator. It is characterized by being.

  In the scotch yoke type operating device, an additional pneumatic actuator made of a cylinder, biston, or the like is provided at an end of the main rod protruding from the casing opposite to the scotch yoke, and the additional actuator also includes the above-mentioned A spring for assisting the biasing force by the spring provided in the main actuator is provided so as to act in the same biasing direction.

  The scotch yoke type operating device includes a piston to which an air pressure provided in the main actuator is applied to the additional actuator and to which an end of the main rod is connected, and a cylinder in which the piston slides. Features.

  In the scotch yoke type operation device, the urging force of the spring that urges the cylinder of the pneumatic actuator that operates in an emergency can act not only in the direction of opening the valve but also in closing. It is characterized by.

  In the scotch yoke type operation device, the additional actuator is provided with a cylindrical cavity provided in the main rod, and is fitted to the cavity, and one end is fixed to a flange of the additional actuator. It is characterized in that a hydraulic actuator composed of a secondary rod can be constructed.

The Scotch yoke type operating device according to the present invention is a Scotch yoke type operating device for operating a valve.
The main rod for swinging the scotch yoke by rotating the valve stem that operates the valve is fixed to the piston that reciprocates in the cylinder, so that the air pressure can always be operated in the valve opening or closing direction. A pneumatic actuator is provided, and a spring is provided between the piston of the pneumatic actuator and a flange for closing the cylinder so as to urge the valve in a normally open or closed direction. In the scotch yoke type operating device which can operate the valve by swinging the scotch yoke by the repulsive force of the spring by removing the acting air pressure,
A cavity having a predetermined diameter and length is provided on the piston side of the main rod, and the main rod is formed in the cavity so as to form a hydraulic actuator on a flange that closes the cylinder opposite to the flange that supports the spring. A secondary rod is provided so that the rod slides and reciprocates, a communication hole is provided between the fixed end of the secondary rod and a free end, and the flange that fixes the secondary rod is provided on the flange. Since the oil pressure inlet / outlet communicating with the communication hole and the oil flange provided with the air vent are attached, the piston can be operated so as to compress the spring by the supplied hydraulic pressure,
The piston in one of the actuators always urges the main rod in the valve opening direction, and if necessary, the main rod is actuated by air pressure in the valve closing or opening direction. The hydraulic actuator can be installed inside the main rod, and the cylinder stroke length of both actuators can be made almost the same without complicating the structure of the hydraulic actuator. Can do.

  In such a scotch yoke type operation device, the main rod is formed of a cylindrical rod having the same diameter in the axial direction, and therefore, there is no need for special processing on the outside of the rod, and there is a cylinder with a built-in spring. A special structure of the actuator can also be obtained without necessity.

  In the Scotch-yoke type operation device, a portion that is provided between the piston and a flange that closes an end of the cylinder and that operates as a hydraulic actuator for the main rod is provided inside a spring along the inner periphery of the cylinder. Therefore, such a hydraulic actuator can be provided inside one of the actuators, and also inside the rod, and can be stored within the stroke range of the actuator, so that a simple structure can be achieved.

  Further, in the Scotch yoke type operating device, since the diameter of the main rod portion on the one actuator side in which the sub rod is fitted is made larger than the diameter of the other portion, the output torque by hydraulic pressure In order to obtain the same output torque from this hydraulic pressure, using a hydraulic pressure obtained by a manual oil pump, a small oil pump that is easy to handle can be used.

  In the scotch yoke type operating device, an additional pneumatic actuator made of a cylinder, biston, or the like is provided at an end of the main rod that protrudes from the casing opposite to the scotch yoke. Since the spring for assisting the biasing force by the spring provided in the main actuator is provided so as to act in the same biasing direction, the piston of the one actuator is always in the same direction as the piston of the other actuator. Since it is biased, the biasing force can be easily adjusted in both or any of the actuators for biasing.

  Further, the Scotch yoke type operating device further includes a piston in which an air pressure provided in the main actuator is applied to the additional actuator and an end of the main rod is connected, and a cylinder in which the piston slides. Therefore, it is possible to easily supply hydraulic pressure to the hydraulic actuator in the main rod without extending the stroke of the piston of the actuator, without increasing the length of the actuator itself, and without complicating the structure.

  The scotch yoke type operating device as described above is such that the urging force of the spring that urges the cylinder of the pneumatic actuator that operates in an emergency acts not only in the direction of opening the valve but also in closing. Therefore, according to the use of the valve, when the valve needs to be opened urgently when the valve is closed, it can be dealt with by shutting off the air pressure and releasing the air pressure.

  The additional actuator is a hydraulic actuator comprising a cylindrical space provided in the main rod, and a secondary rod provided so as to be fitted in the space and having one end fixed to a flange of the additional actuator. Therefore, depending on the application, a hydraulic actuator can be provided for the additional actuator, and the arrangement of the spring or the like can be used to help simplify the structure.

  The novel features, configurations, and advantages of the present invention can be further understood from the accompanying drawings associated with the following description. In the drawings, the same reference numerals indicate the same components.

It is a partial section side view showing the scotch yoke type operating device by one embodiment of the present invention. It is sectional drawing of the scotch yoke type operating device by other embodiment of this invention. It is sectional drawing of the conventional Scotch yoke type operating device. It is sectional drawing of the scotch yoke type operating device which has another conventional structure. Furthermore, it is sectional drawing of the scotch-yoke type operating device which has another conventional structure.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. In addition, what has the same reference number as FIG. 3 thru | or FIG. 5 demonstrates as showing the substantially same structural member.

  An embodiment of the present invention will be described with reference to FIG. 1. A scotch yoke type valve operating device 1 includes a casing 16 provided with a valve stem 12 of a valve such as a pipeline entering the inside thereof. A scotch yoke 2 for rotating the valve stem 12 is provided so as to be swingable. A long hole 22 is provided along the longitudinal center line of the scotch yoke 2, and the main rod 3 is slidably supported by bushes 17 and 18 that close opposite openings of the casing 16 in the long hole 22. The long hole 22 of the scotch yoke 2 is movably engaged with a pin 34 fixed at an appropriate position of the main rod 3. Thereby, the main rod 3 can swing the scotch yoke 2 by the pin 34 engaged with the long hole 22 by the horizontal movement. Further, the scotch yoke 2 is integrally provided on the opposite side (not shown) of the cylindrical body fitted to the valve stem 12 and fixed by the key 14 and attached to the main rod 3 in the same manner as shown in the figure. A long hole is provided to engage the pin.

  One actuator 4 is provided on the flange on the opposite surface side of the casing 16 on the right side in FIG. 1, and the other actuator 5 is provided on the left flange. One actuator 4 has a cylinder 45 closed by a flange 44 integrally fixed to the casing 16 and a flange 46 on the other side, and a piston 42 is fixed to the end of the main rod 3 inside the cylinder 45. Thus, the nut 36 is screwed and fixed, and is slid by air pressure acting on the piston 42 that slides the main rod 3 as shown in the figure. The piston 42 is provided via an O-ring 422 to obtain a seal against the inner surface of the cylinder 45. When the air pressure supplied through the air pipe 7 is not supplied through the vent hole 72, the spring 43 is always provided. Therefore, it is urged to press against the nut 36. When the piston 42 is moved in the illustrated left direction against the urging force of the spring 43, the main rod 3 is simultaneously moved to the position indicated by the two-dot chain line, and as a result, the scotch yoke 2 is opened so as to open the valve. Is swung to the left in the figure.

  In order to obtain an additional operating force by the scotch yoke 2 for this purpose, the other actuator 5 attached to the flange of the casing 16 is provided on the left side of the main rod 3 in the figure. A cylinder 54 whose end opposite to the flange 56 on the casing 16 side is closed by a flange 55, and a piston 52 moving inside the cylinder 54 obtains a sealing property with respect to the cylinder 54 by an O-ring. The end of the rod 3 is fixed with a nut 53. Air pressure is supplied to the left side of the piston 52 through the air pipe 7 through the air pressure supply hole 74. The main rod 3 is given not only one actuator 4 but also the other actuator 5 with an operating force in the left valve opening direction in the figure.

  In addition, in one actuator 4, a sub rod 6 serving as a guide rod has a cavity serving as a rod inner cylinder 324 in the axial direction of the main rod 3, and is slidably inserted into the rod inner cylinder 324. Has been. A through hole 62 is formed along the central axis of the sub rod 6, and hydraulic pressure can be supplied and discharged via an oil flange 47 provided on the flange 46. The oil flange 47 is provided with a hydraulic inlet / outlet 48 and an air vent port 49 for removing air remaining inside the hydraulic pressure supply, and the main rod 3 has the same diameter φd up to the end of the main rod 3. Yes. The hydraulic actuator 10 can be operated by a manual oil pump even when air pressure cannot be obtained, and can cope with an emergency.

  In the scotch yoke type valve operating device 1 according to the embodiment of the present invention as described above, the spring 43 shows the piston 42 in the right side in the state shown in FIG. It is energized so that it pushes in the direction. In this state, the air pressure from the air pipe 7 is supplied to the right side of the pistons 42, 52 of the one actuator 4 and the other actuator 5, and these pistons 42, 52 move to the left side of the figure against the spring 43. The main rod 3 that is simultaneously moved is moved to the left in the figure. As a result, the scotch yoke 2 engaged with the pin 34 is swung leftward in the drawing to the position indicated by the two-dot chain line, and the valve stem 12 is rotated to operate the valve toward the opening of the pipeline. Can be made.

  In order to close the valve, if the air pressure applied to the pistons 42 and 52 of the one actuator 4 and the other actuator 5 is removed, the biasing force of the spring 43 to the piston 42 causes the piston 42 to move to the right in the figure. It can be moved to close the valve. In such a state, when an emergency of opening the valve itself occurs, hydraulic pressure is supplied from the hydraulic inlet / outlet 48 to the hydraulic cylinder 10 inside the rod 324 through the through hole 62. Then, the cylinder 324 itself in the rod is moved to the left in the figure, and the piston 42 can be moved to the position of the two-dot chain line. Thus, the valve can be opened even in an emergency situation where air pressure cannot be obtained.

  In the above embodiment, the main rod 3 having the same diameter as a whole is used. However, as shown in FIG. 2, the diameter φD of the portion fitted to the sub rod 6 is the diameter of the main portion of the main rod 3. It may be formed to be larger than that. Since the diameter φD of this portion is larger than the diameter φd of the main rod 3 of the embodiment, a larger output torque than that shown in FIG. 1 can be produced, so that the hydraulic pressure to be supplied is supplied by a manual pump. In other words, the same output torque can be obtained even if a manual pump having a small output torque is used.

  In the above embodiment, the spring 43 is used as the biasing means of the piston 42, but other means may be used as long as the same biasing force can be obtained.

  Similar to the main actuator, the additional actuator 5 is provided with a cylindrical cavity provided in the main rod 3, and is fitted to the cavity, and one end is fixed to the flange of the additional actuator. A hydraulic actuator consisting of a secondary rod can be provided, so that the output torque requirement of the scotch yoke can be dealt with depending on the application, and the arrangement of springs etc. can be dealt with in both actuators. Can be used to help simplify the structure.

  As described above, it is obvious that the Scotch yoke type valve operating device according to the present invention is not limited to the above-described embodiment, and can be implemented within the technical scope described in the claims.

DESCRIPTION OF SYMBOLS 1 Scotch yoke type valve | bulb operating device 2 Scotch yoke 3 Main shaft 4 One actuator 5 The other actuator 6 Sub rod 7 Air piping 10 Hydraulic actuator 12 Valve stem 14 Valve stem key 16 Casing 22 Long hole 34 Pin 36 Nut 37 O ring 38 O Ring 39 O-ring 40 O-ring 41 O-ring 42 Piston 43 Spring 44 Flange 45 Cylinder 46 Flange 47 Oil flange 48 Hydraulic inlet / outlet 49 Air vent 52 Piston 53 Nut 54 Cylinder 55 Flange 56 Flange 62 Hydraulic supply port 64 O-ring 72 Air pressure supply Port 74 Air pressure supply port 324 Cylinder in rod 422 O-ring 424 O-ring 462 O-ring

Claims (8)

A scotch yoke type operation device for operating a valve, wherein a main rod for swinging a scotch yoke by rotating a valve stem that operates the valve is fixed to a piston that reciprocates in a cylinder, A pneumatic actuator capable of always operating air pressure in a valve opening or closing direction, and biasing the valve in a normally opening or closing direction between the piston and the flange for closing the cylinder; In a scotch yoke type operating device capable of operating a valve by swinging the scotch yoke by repulsive force of the spring by shutting off the air pressure in an emergency and removing the air pressure acting on the cylinder in an emergency,
A cavity having a predetermined diameter and length is provided on the piston side of the main rod, and the main rod is formed in the cavity so as to form a hydraulic actuator on a flange that closes the cylinder opposite to the flange that supports the spring. A secondary rod is provided so that the rod slides and reciprocates, a communication hole is provided between the fixed end of the secondary rod and a free end, and the flange that fixes the secondary rod is provided on the flange. A scotch-yoke type operation characterized in that an oil flange provided with a hydraulic inlet / outlet communicating with the communication hole and an air vent is attached, and the piston can be operated to compress the spring by the supplied hydraulic pressure. apparatus.   The scotch yoke type operating device according to claim 1, wherein the main rod is formed of a cylindrical rod having the same diameter in the axial direction.   2. A portion provided between the piston and a flange that closes an end of the cylinder, and a portion that operates as a hydraulic actuator of the main rod is provided inside a spring along an inner periphery of the cylinder. The scotch yoke type operation device described in 1.   The diameter of the portion of the main rod with which the sub rod is fitted is made larger than the diameter of other portions as necessary so as to increase the torque of the hydraulic actuator. 1. A scotch yoke type operating device described in 1.   An additional pneumatic actuator comprising a cylinder, a piston, etc. is provided at the end of the main rod that protrudes from the casing opposite to the scotch yoke, and the additional actuator is also provided with a biasing force by a spring provided in the main actuator. The scotch yoke type operating device according to claim 1, wherein a spring for assisting the operation is provided so as to act in the same urging direction.   6. The piston according to claim 5, further comprising: a piston in which an air pressure provided in the main actuator is applied to the additional actuator and an end of the main rod is connected, and a cylinder in which the piston slides. Scotch yoke type operation device.   The urging force of a spring that urges a cylinder of a pneumatic actuator that operates in an emergency can act not only in the direction of opening the valve but also in closing. Scotch yoke type operation device.   The additional actuator is provided with a hydraulic actuator comprising a cylindrical cavity provided in the main rod, and a secondary rod fitted into the cavity and fixed at one end to a flange of the additional actuator. The scotch yoke type operating device according to claim 5 or 6.