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CN-224229391-U - Inner curve pneumatic actuator for valve

CN224229391UCN 224229391 UCN224229391 UCN 224229391UCN-224229391-U

Abstract

The utility model discloses an inner curve pneumatic actuator for a valve, which comprises a shell, a main shaft, a driving mechanism and a valve, wherein the shell is provided with an air hole group for air inlet and air exhaust, the main shaft is installed in the shell and can circumferentially rotate, a first end of the main shaft is used as an output end and is used for being connected with the valve, a second end of the main shaft is used as an input end and is used for being connected with a hand wheel, the driving mechanism is installed in the shell and comprises a piston assembly, a guide rail and a cylinder body, the cylinder body is installed on the main shaft and can circumferentially rotate along with the main shaft, a plurality of piston cavities are circumferentially arranged on the side wall of the cylinder body, the piston assembly is slidably installed in the piston cavities, the sliding direction is perpendicular to the axis of the main shaft, the guide rail is installed in the shell, the guide surface of the guide rail is abutted against the end of the piston assembly, and the valve disc is installed in the shell and is used for supplying air to the driving mechanism so that the end of the piston assembly always abutted against the guide surface of the guide rail and drives the main shaft to rotate. The actuator has compact structure, stable and continuous torque output.

Inventors

  • LU TENGFENG

Assignees

  • 宁波新鑫石化机械设备制造有限公司

Dates

Publication Date
20260512
Application Date
20260205

Claims (8)

  1. 1. An inner curve pneumatic actuator for a valve, comprising: a shell provided with an air hole group for air intake and exhaust; The main shaft is arranged in the shell and can rotate circumferentially, a first end of the main shaft is used as an output end and is used for being connected with the valve, and a second end of the main shaft is used as an input end and is used for being connected with the hand wheel; The driving mechanism is arranged in the shell and comprises a piston assembly, a guide rail and a cylinder body, wherein the cylinder body is arranged on the main shaft and can circumferentially rotate along with the main shaft, a plurality of piston cavities are circumferentially arranged on the side wall of the cylinder body, the piston assembly is slidably arranged in the piston cavities, the sliding direction of the piston assembly is perpendicular to the axis of the main shaft, the guide rail is arranged in the shell, the guide surface of the guide rail is abutted to the end part of the piston assembly, and a continuous curved surface is formed on the guide surface of the guide rail in the circumferential direction of the main shaft; The air distribution disc is arranged in the shell and is used for supplying air and exhausting air to the driving mechanism so that the end part of the piston assembly is always abutted against the guide surface of the guide rail and drives the main shaft to rotate.
  2. 2. An inner curve pneumatic actuator for a valve as set forth in claim 1 wherein said guide track is of an inner curve configuration.
  3. 3. An inner curve pneumatic actuator for a valve according to claim 1, wherein the number of the driving mechanisms is plural, the driving mechanisms are arranged along the axial direction of the main shaft, one group of the driving mechanisms is positioned on the same radial surface, and the piston cavities which are arranged on the main shaft in a sleeved mode and positioned on the same axial surface are mutually communicated.
  4. 4. An inner curve pneumatic actuator for a valve as set forth in claim 1 wherein said piston assembly includes a piston body and a rotating member mounted to an end of said piston body, said piston body being slidably mounted within said piston chamber, an end of said rotating member being in rolling friction with a guide surface of said guide rail at all times.
  5. 5. The inner curve pneumatic actuator for a valve as set forth in claim 4, wherein said rotary member comprises a seat and balls mounted on said seat, said balls rolling against a guiding surface of said guide rail, said seat being provided with a connecting portion detachably connected to said piston body.
  6. 6. The inner curve pneumatic actuator for a valve according to claim 1, wherein the main shaft is provided with two mounting surfaces, two of the mounting surfaces are respectively attached to and provided with a flower disc, and the cylinder is positioned between the two flower discs and is fixed on the main shaft through the two flower discs.
  7. 7. The inner curve pneumatic actuator for a valve of claim 6, wherein the faceplate adjacent to the valve plate is provided with air holes, and the piston chamber is in communication with an air supply hole or an air exhaust hole of the valve plate through the air holes.
  8. 8. The inner curve pneumatic actuator for a valve of claim 1, wherein the housing comprises an upper cover, a lower cover and a cylinder, the upper cover and the lower cover being mounted to an upper end surface and a lower end surface of the cylinder, respectively, and bolts passing through the upper cover, the guide rail and the lower cover in order to fix the guide rail in the housing.

Description

Inner curve pneumatic actuator for valve Technical Field The utility model relates to the technical field of valves, in particular to an inner curve pneumatic actuator for a valve. Background The pneumatic actuator is used as a device for converting the energy of compressed air into rotary motion, and is widely applied to the fields of industrial automation, valve control and the like due to the advantages of cleanness, explosion prevention, quick response and the like. The traditional pneumatic actuator adopts the structures of a gear rack, a blade or a piston connecting rod and the like to realize the conversion from linear motion to rotary motion, and a cross beam is arranged in a shell of the traditional pneumatic actuator. In the executing process of the structures, the problems of complex structure, large volume, insufficient stable torque output, dead zone and the like often exist. Particularly when a large torque output is required, it is often necessary to increase the cylinder diameter or piston stroke, resulting in a significant increase in the overall size and weight of the actuator, which is disadvantageous for installation in a compact space, and needs to be improved. Disclosure of utility model The present application has been made to solve the above-mentioned problems, and it is an object of the present application to provide an inner curve pneumatic actuator for a valve, comprising: a shell provided with an air hole group for air intake and exhaust; The main shaft is arranged in the shell and can rotate circumferentially, a first end of the main shaft is used as an output end and is used for being connected with the valve, and a second end of the main shaft is used as an input end and is used for being connected with the hand wheel; The driving mechanism is arranged in the shell and comprises a piston assembly, a guide rail and a cylinder body, wherein the cylinder body is arranged on the main shaft and can circumferentially rotate along with the main shaft, a plurality of piston cavities are circumferentially arranged on the side wall of the cylinder body, the piston assembly is slidably arranged in the piston cavities, the sliding direction of the piston assembly is perpendicular to the axis of the main shaft, the guide rail is arranged in the shell, the guide surface of the guide rail is abutted to the end part of the piston assembly, and a continuous curved surface is formed on the guide surface of the guide rail in the circumferential direction of the main shaft; The driving mechanism is compact in structure and reasonable in layout, stable and continuous torque output can be realized, the radial size is effectively reduced, and the driving mechanism is suitable for occasions with limited space. Preferably, the guide rail has an inner curve structure. The design of the inner curve structure can further amplify the torque. Preferably, the number of the driving mechanisms is multiple, the driving mechanisms are arranged along the axial direction of the main shaft, one group of the driving mechanisms are positioned on the same radial surface, and the cylinder bodies are sleeved with the piston cavities which are arranged on the main shaft and positioned on the same axial surface and are mutually communicated. The multiple drive mechanism design enables the actuator to provide greater torque output capability while maintaining overall structural compactness and operational smoothness. Preferably, the piston assembly comprises a piston body and a rotating piece arranged at the end part of the piston body, wherein the piston body is slidably arranged in the piston cavity, and the end part of the rotating piece always performs rolling friction with the guide surface of the guide rail. The structure of the rotating piece enables the piston assembly to keep a stable contact state in the moving process, and energy loss caused by uneven friction is avoided. Preferably, the rotating member comprises a seat body and balls mounted on the seat body, the balls are in rolling friction with the guide surface of the guide rail, a connecting portion is arranged on the seat body, and the connecting portion is detachably connected with the piston body. The detachable connection structure is convenient to maintain and replace. Preferably, the main shaft is provided with two mounting surfaces, the two mounting surfaces are respectively attached to and provided with a flower disc, and the cylinder body is positioned between the two flower discs and is fixed on the main shaft through the two flower discs. This design ensures a secure connection between the cylinder and the spindle while facilitating assembly and disassembly. Preferably, the air hole is arranged on the flower disc close to the air distribution disc, and the piston cavity is communicated with an air supply hole or an air exhaust hole of the air distribution disc through the air hole. The air holes on the flower disc further ensure the smoothness