Pneumatic actuator with anti-rotation structure

Abstract

The utility model discloses a pneumatic actuator with anti -rotation structure, including cylinder portion, piston rod, elastic part and anti -rotation structure, the both ends of cylinder portion are provided with upper sealing plug and lower sealing plug, is equipped with piston chamber in the cylinder portion, and piston rod includes piston part and stem portion, and stem portion includes the upper stem portion of being located piston part upper end and the lower stem portion of being located piston part lower extreme, and anti -rotation structure includes setting in the rotation stop portion of upper stem portion and setting the rotation stop groove of upper sealing plug, and rotation stop portion reaches into rotation stop groove and with rotation stop groove rotation stop cooperation, and upper sealing plug is equipped with with rotation stop groove intercommunication's air inlet, and stem portion is equipped with air inlet channel, and air inlet channel's first end intercommunication air inlet, and air inlet channel's second end intercommunication to lower piston chamber, and lower sealing plug is equipped with with the central passage of the lower stem portion of going out, and one end of elastic part is located in upper sealing plug, and the other end of elastic part is located in piston part, can realize the purpose of anti -rotation, need not add new parts, and the assembly is convenient.

Description

Technical Field

[0001] This utility model relates to the technical field of valves, and in particular to a pneumatic actuator with an anti-rotation structure. Background Technology

[0002] Current actuators typically employ electric, pneumatic, or hydraulic methods to drive internal components to perform linear or angular displacement, thereby quickly opening or closing valves or other valves. However, conventional pneumatic actuators lack anti-rotation structures, allowing the piston to rotate along its axis. This poses a risk of the diaphragm, which is threaded at the bottom of the piston, loosening or even detaching. Therefore, improvements to existing pneumatic actuators are necessary. Summary of the Invention

[0003] The purpose of this invention is to provide a pneumatic actuator with an anti-rotation structure. It utilizes the anti-rotation part of the upper rod body and the anti-rotation groove of the upper sealing plug to achieve the purpose of anti-rotation. No additional parts are required, the fit is highly accurate, and assembly is convenient.

[0004] The above-mentioned technical objective of this utility model is achieved through the following technical solution: A pneumatic actuator with an anti-rotation structure includes a cylindrical body, a piston rod, an elastic element, and an anti-rotation structure. The cylindrical body has an upper sealing plug and a lower sealing plug at both ends. A piston chamber is provided inside the cylindrical body. The piston rod includes a piston part and a rod part. The piston part seals and divides the piston chamber into an upper piston chamber and a lower piston chamber. The rod part includes an upper rod part located at the upper end of the piston part and a lower rod part located at the lower end of the piston part. The anti-rotation structure includes... The upper rod body has an anti-rotation part and an anti-rotation groove with an upper sealing plug. The anti-rotation part is slidably disposed in the anti-rotation groove and anti-rotates with the anti-rotation groove. The upper sealing plug has an air inlet hole that communicates with the anti-rotation groove. The rod body has an air inlet channel. The first end of the air inlet channel is connected to the air inlet hole, and the second end of the air inlet channel is connected to the lower piston chamber. The lower sealing plug has a central channel for the lower rod body to extend out. The elastic element is disposed in the upper piston chamber. One end of the elastic element abuts against the upper sealing plug, and the other end of the elastic element abuts against the piston body.

[0005] Furthermore, the anti-rotation part is a flat part, and the anti-rotation groove is a flat groove adapted to the flat part.

[0006] Furthermore, the upper sealing plug has a cylindrical portion extending into the piston cavity at its center, and an anti-rotation groove is provided inside the cylindrical portion.

[0007] Furthermore, a first sealing ring is provided between the inner wall of the upper rod body and the inner wall of the column body.

[0008] Furthermore, at least one second sealing ring is provided between the lower rod body and the lower sealing plug.

[0009] Furthermore, the upper sealing plug is provided with an exhaust port that communicates with the upper piston chamber.

[0010] Furthermore, a third sealing element is provided between the upper sealing plug and the cylinder part, and between the lower sealing plug and the cylinder part.

[0011] In summary, this utility model has the following beneficial effects: The pneumatic actuator of this invention utilizes the anti-rotation part of the upper rod body and the anti-rotation groove of the upper sealing plug to achieve the purpose of preventing rotation. No additional parts are required, the fit is highly accurate, and assembly is convenient. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0013] Figure 2 This is a schematic diagram of the anti-rotation structure of this utility model.

[0014] Figure 3 This is a schematic diagram of the upper sealing plug of this utility model.

[0015] Figure 4 This is a schematic diagram of the pneumatic actuator of this utility model installed on the valve body.

[0016] In the diagram: 10. Cylinder body; 11. Piston chamber; 111. Upper piston chamber; 112. Lower piston chamber; 20. Piston rod; 21. Piston part; 22. Rod body part; 221. Upper rod body part; 222. Lower rod body part; 23. Inlet passage; 30. Elastic element; 40. Anti-rotation structure; 41. Anti-rotation part; 42. Anti-rotation groove; 50. Upper sealing plug; 51. Inlet port; 52. Column part; 53. Exhaust port; 60. Lower sealing plug; 70. First sealing ring; 80. Second sealing ring; 90. Third sealing element; 100. Valve body; 110. Diaphragm. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings.

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can typically be arranged and designed in various different configurations.

[0019] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0020] like Figures 1-4 As shown, a pneumatic actuator with an anti-rotation structure includes a cylinder 10, a piston rod 20, an elastic element 30, and an anti-rotation structure 40, which constitute the basic structure of this utility model.

[0021] The cylindrical part 10 is a cylindrical structure that runs vertically through the body. The two ends of the cylindrical part 10 are provided with an upper sealing plug 50 and a lower sealing plug 60. The cylindrical part 10 is provided with a piston cavity 11, which is formed by the upper sealing plug 50, the cylindrical part 10 and the lower sealing plug 60. The piston rod 20 includes a piston part 21 and a rod part 22. The piston part 21 seals and divides the piston cavity 11 into an upper piston cavity 111 and a lower piston cavity 112. The rod part 22 includes an upper rod part 221 located at the upper end of the piston part 21 and a lower rod part 222 located at the lower end of the piston part 21. The upper rod part 221 and the lower rod part 222 can be integrally formed or detachably connected, preferably integrally formed.

[0022] The anti-rotation structure 40 includes an anti-rotation part 41 disposed on the upper rod body 221 and an anti-rotation groove 42 disposed on an upper sealing plug 50. The anti-rotation part 41 is slidably disposed in the anti-rotation groove 42 and anti-rotates with the anti-rotation groove 42. The upper sealing plug 50 is provided with an air inlet 51 communicating with the anti-rotation groove 42. An air inlet channel 23 is provided in the rod body 22. The first end of the air inlet channel 23 is connected to the air inlet 51, and the second end of the air inlet channel 23 is connected to the lower piston chamber 112. The lower sealing plug 60 is provided with a central channel for the lower rod body 222 to extend out. The elastic member 30 is disposed in the upper piston chamber 111. One end of the elastic member 30 abuts against the upper sealing plug 50, and the other end of the elastic member 30 abuts against the piston part 21. Under the action of the elastic member 30, the piston part 21 has a tendency to press down on the lower sealing plug 60.

[0023] The pneumatic actuator is installed at the upper end of the valve body 100. The valve body 100 is provided with a valve port and a diaphragm 110 for opening and closing the valve port. The lower rod part 222 of the pneumatic actuator extends out of the central channel of the lower sealing plug 60 and is connected to the diaphragm 110.

[0024] In some embodiments, the anti-rotation part 41 is a flat part, and the anti-rotation groove 42 is a flat groove adapted to the flat part. Through the anti-rotation cooperation of the flat part and the flat groove, the piston rod 20 is prevented from rotating during reciprocating movement, thereby preventing it from loosening or detaching from the diaphragm 110.

[0025] In some embodiments, the upper sealing plug 50 has a cylindrical portion 52 extending into the piston chamber 11 at its center, and an anti-rotation groove 42 is disposed in the cylindrical portion 52. Disposing the cylindrical portion 52 in the piston chamber 11 can reduce the overall length and volume of the actuator, thereby achieving the purpose of miniaturization. The lower end face of the cylindrical portion 52 can also be matched with the piston portion 21 to limit the stroke position of the piston rod 20.

[0026] In some embodiments, a first sealing ring 70 is provided between the inner wall of the upper rod body 221 and the inner wall of the column body 52. ​​The first sealing ring 70 is provided to prevent the compressed gas introduced from the air inlet 51 from escaping from the gap between the inner wall of the upper rod body 221 and the inner wall of the column body 52 into the upper piston chamber 111.

[0027] In some embodiments, at least one second sealing ring 80 is provided between the lower rod body portion 222 and the lower sealing plug 60. Preferably, two second sealing rings 80 are provided and spaced apart within the lower sealing plug 60. This arrangement can effectively improve the sealing performance between the lower rod body portion 222 and the lower sealing plug 60, preventing compressed gas in the lower piston chamber 112 from escaping through the gap between the lower rod body portion 222 and the lower sealing plug 60.

[0028] In some embodiments, the upper sealing plug 50 is provided with an exhaust hole 53 communicating with the upper piston chamber 111. The exhaust hole 53 is a small hole. When compressed gas enters the air inlet 51, the compressed gas will overcome the elastic force of the elastic element 30 and drive the piston rod 20 to move to the side of the upper sealing plug 50. The air in the upper piston chamber 111 can be discharged to the outside through the exhaust hole 53, thereby making the piston rod 20 move upward more smoothly and at a faster speed.

[0029] In some embodiments, a third sealing element 90 is provided between the upper sealing plug 50 and the cylinder portion 10 and between the lower sealing plug 60 and the cylinder portion 10 to prevent compressed gas in the lower piston chamber 112 from escaping from the gap between the cylinder portion 10 and the lower sealing plug 60.

[0030] In summary, this utility model has the following beneficial effects: The pneumatic actuator of this utility model utilizes the anti-rotation part 41 of the upper rod body 221 and the anti-rotation groove 42 of the upper sealing plug 50 to achieve the purpose of preventing rotation. No additional parts are required, the fit is highly accurate, and the assembly is convenient.

[0031] The above description is only a preferred embodiment of the present utility model. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of the present utility model patent application are included in the scope of the present utility model patent application.

Claims

1. A pneumatic actuator with an anti-rotation structure, characterized in that: The device includes a cylindrical body (10), a piston rod (20), an elastic element (30), and an anti-rotation structure (40). The cylindrical body (10) has an upper sealing plug (50) and a lower sealing plug (60) at both ends. A piston chamber (11) is located inside the cylindrical body (10). The piston rod (20) includes a piston part (21) and a rod part (22). The piston part (21) seals and divides the piston chamber (11) into an upper piston chamber (111) and a lower piston chamber (112). The rod part (22) includes an upper rod part (221) located at the upper end of the piston part (21) and a lower rod part (222) located at the lower end of the piston part (21). The anti-rotation structure (40) includes an anti-rotation part (41) located on the upper rod part (221) and an upper sealing plug (40). The anti-rotation groove (42) of the plug (50) has an anti-rotation part (41) which is slidably disposed in the anti-rotation groove (42) and anti-rotationally engaged with the anti-rotation groove (42). The upper sealing plug (50) is provided with an air inlet (51) that communicates with the anti-rotation groove (42). The rod body (22) is provided with an air inlet channel (23). The first end of the air inlet channel (23) is connected to the air inlet (51), and the second end of the air inlet channel (23) is connected to the lower piston chamber (112). The lower sealing plug (60) is provided with a central channel for the lower rod body (222) to extend out. The elastic element (30) is disposed in the upper piston chamber (111). One end of the elastic element (30) abuts against the upper sealing plug (50), and the other end of the elastic element (30) abuts against the piston body (21).

2. A pneumatic actuator with an anti-rotation structure according to claim 1, characterized in that: The anti-rotation part (41) is a flat part, and the anti-rotation groove (42) is a flat groove adapted to the flat part.

3. A pneumatic actuator with an anti-rotation structure according to claim 1, characterized in that: The upper sealing plug (50) has a cylindrical part (52) extending into the piston cavity (11) at its center, and an anti-rotation groove (42) is provided in the cylindrical part (52).

4. A pneumatic actuator with an anti-rotation structure according to claim 3, characterized in that: A first sealing ring (70) is provided between the inner wall of the upper rod body (221) and the column body (52).

5. A pneumatic actuator with an anti-rotation structure according to claim 4, characterized in that: At least one second sealing ring (80) is provided between the lower rod body (222) and the lower sealing plug (60).

6. A pneumatic actuator with an anti-rotation structure according to any one of claims 1-5, characterized in that: The upper sealing plug (50) is provided with an exhaust port (53) that communicates with the upper piston chamber (111).

7. A pneumatic actuator with an anti-rotation structure according to claim 6, characterized in that: A third sealing element (90) is provided between the upper sealing plug (50) and the cylindrical part (10) and between the lower sealing plug (60) and the cylindrical part (10).

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