Pneumatic actuating mechanism for opening and closing valve

Abstract

The utility model relates to the technical field of valves, in particular to a pneumatic actuating mechanism for opening and closing a valve, which comprises a control valve, a cylinder component and a return component, the return component comprises a return elastic piece, the cylinder component comprises a cylinder body, a piston and a piston rod, the cylinder body is provided with a gas interface and an exhaust port, one end of the piston rod is connected with the piston, and the other end of the piston rod is connected with the return elastic piece. The other end of the piston rod penetrates out of the cylinder body to be connected with a return elastic piece, a movable transmission piece matched with the valve opening and closing transmission piece is arranged on the piston rod, the first connector of the control valve is connected with the gas connector through a first pipeline, the exhaust pipeline is connected with the exhaust port, and the check valve is arranged on the exhaust pipeline. The check valve is a one-way valve, gas in the cylinder body can be exhausted through the exhaust port and the exhaust pipeline, gas in the atmosphere cannot enter the cylinder body, the service life of the cylinder body is effectively guaranteed and prolonged, and then the service life of the pneumatic actuating mechanism is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a pneumatic actuator for valve opening and closing. Background Art

[0002] Valve opening and closing is usually realized by a pneumatic actuator. At present, a commonly used pneumatic actuator includes a control valve, a cylinder assembly and a return component. The return component includes a return elastic member. The cylinder assembly includes a cylinder body, a piston and a piston rod. The piston is arranged in the cylinder body in a matching manner. A gas interface and an exhaust port are arranged on the cylinder body. The gas interface and the exhaust port are located on both sides of the piston. One end of the piston rod is connected to the piston, and the other end of the piston rod passes through the cylinder body and is connected to the return elastic member. A moving transmission member adapted to the valve opening and closing transmission member is arranged on the piston rod. The moving transmission member is located between the cylinder body and the return elastic member. The first interface of the control valve is connected to the gas interface through a first pipeline. When this pneumatic actuator works, the valve opening and closing transmission member is connected to the moving transmission member. After the control valve is powered on, it controls the power gas to enter the cylinder body along the first pipeline, pushes the piston to drive the piston rod to extend outwards. When the piston rod extends outwards, it drives the moving transmission member to move and compress the return elastic member. The movement of the moving transmission member drives the valve opening and closing transmission member to work, thereby opening or closing the valve. After the control valve loses power, under the action of the rebound of the return elastic member, the piston rod retracts inwards. The inward retraction of the piston rod drives the moving transmission member to move in the opposite direction. The movement of the moving transmission member in the opposite direction also drives the valve opening and closing transmission member to work, thereby closing or opening the valve. The power gas in the cylinder body is exhausted at the control valve through the first pipeline, thus completing the valve opening and closing work.

[0003] Since there is still some gas remaining in the cylinder body of the cylinder assembly, when the piston rod extends outwards, the remaining gas is discharged through the exhaust port. During the process of the remaining gas being discharged through the exhaust port, the gas in the atmosphere may also enter the cylinder body. When in an environment with corrosive gas, such as a marine environment, the corrosive gas will enter the cylinder body, corrode the inner wall of the cylinder body, affect its use, and seriously reduce the service life of the pneumatic actuator. Summary of the Utility Model

[0004] The technical problem solved by the utility model is to provide a pneumatic actuator for valve opening and closing with a relatively long service life.

[0005] The technical solution adopted by the present utility model to solve its technical problems is as follows: a pneumatic actuator for valve opening and closing, including a control valve, a cylinder assembly, and a return assembly. The return assembly includes a return elastic member. The cylinder assembly includes a cylinder body, a piston, and a piston rod. The piston is fitted in the cylinder body. The cylinder body is provided with a gas interface and an exhaust port, and the gas interface and the exhaust port are located on both sides of the piston. One end of the piston rod is connected to the piston, and the other end of the piston rod passes through the cylinder body and is connected to the return elastic member. A moving transmission member adapted to the valve opening and closing transmission member is provided on the piston rod, and the moving transmission member is located between the cylinder body and the return elastic member. The first interface of the control valve is connected to the gas interface through a first pipeline. It further includes an exhaust pipeline and a check valve. The exhaust pipeline is connected to the exhaust port, and the check valve is provided on the exhaust pipeline.

[0006] Further, the control valve is a two-position three-way solenoid valve.

[0007] Further, it further includes an air source, and the air source is connected to the second interface of the control valve through a second pipeline.

[0008] Further, it further includes a filter pressure reducing valve, and the filter pressure reducing valve is provided on the second pipeline.

[0009] Further, it further includes a third pipeline. One end of the third pipeline is connected to the third interface of the control valve, and the other end of the third pipeline is connected to the exhaust pipeline. And the connection part of the third pipeline and the exhaust pipeline is located between the check valve and the exhaust port.

[0010] Further, the material of the cylinder assembly is stainless steel.

[0011] Further, the return elastic member is a spring. The return assembly further includes a protective sleeve. The return elastic member is arranged in the protective sleeve along the length direction of the protective sleeve, and one end of the return elastic member is connected to one side wall of the protective sleeve. The other end of the piston rod penetrates into the protective sleeve and is connected to the other end of the return elastic member.

[0012] Further, a guide plate is provided between the piston rod and the return elastic member. The guide plate is fitted in the protective sleeve, and the guide plate can move back and forth along the length direction of the protective sleeve.

[0013] Further, a silencer is provided at the outer end of the exhaust pipeline.

[0014] The beneficial effects of the present utility model are as follows: By providing an exhaust pipe and a check valve, the exhaust pipe is connected to the exhaust port, and the check valve is arranged on the exhaust pipe. The check valve is a one-way valve, so that the gas in the cylinder block can be discharged through the exhaust port and the exhaust pipe, while the gas in the atmosphere cannot enter the cylinder block, effectively ensuring and increasing the service life of the cylinder block, and further increasing the service life of the pneumatic actuator. And the control valve is a two-position three-way solenoid valve, and a third pipe is also provided. One end of the third pipe is connected to the third interface of the control valve, and the other end of the third pipe is connected to the exhaust pipe. The connection between the third pipe and the exhaust pipe is located between the check valve and the exhaust port. Part of the power gas can be recycled in each pipe and the cylinder block, reducing the loss of the power gas and lowering the use cost of the pneumatic actuator. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic structural diagram of the present utility model;

[0016] Marked as: control valve 1, return elastic member 2, cylinder block 3, piston 4, piston rod 5, moving transmission member 6, exhaust pipe 7, check valve 8, air source 9, filter pressure reducing valve 10, third pipe 11, protective sleeve 12, guide plate 13. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] The present utility model will be further described below in conjunction with the drawings and specific embodiments.

[0018] As Figure 1 shown, the pneumatic actuator for valve opening and closing of the present utility model includes a control valve 1, a cylinder assembly and a return assembly. The return assembly includes a return elastic member 2. The cylinder assembly includes a cylinder block 3, a piston 4 and a piston rod 5. The piston 4 is arranged in the cylinder block 3 in a matching manner. The cylinder block 3 is provided with a gas interface and an exhaust port. The gas interface and the exhaust port are located on both sides of the piston 4. One end of the piston rod 5 is connected to the piston 4, and the other end of the piston rod 5 passes through the cylinder block 3 and is connected to the return elastic member 2. A moving transmission member 6 adapted to the valve opening and closing transmission member is arranged on the piston rod 5. The moving transmission member 6 is located between the cylinder block 3 and the return elastic member 2. The first interface of the control valve 1 is connected to the gas interface through a first pipe. It further includes an exhaust pipe 7 and a check valve 8. The exhaust pipe 7 is connected to the exhaust port, and the check valve 8 is arranged on the exhaust pipe 7. The check valve 8 is a one-way valve, so that the gas in the cylinder block 3 can be discharged through the exhaust port and the exhaust pipe 7, while the gas in the atmosphere cannot enter the cylinder block 3.

[0019] Specifically, for the convenience of using the control valve 1, the control valve 1 is preferably a two-position three-way solenoid valve. For the convenience of providing a power air source, such as compressed air, and again such as Figure 1As shown in the figure, the utility model is further provided with an air source 9, and the air source 9 is connected to the second interface of the control valve 1 through a second pipeline. When the control valve 1 is powered on, the power gas in the air source 9 enters the cylinder block 3 through the second pipeline, the control valve 1, the first pipeline, and the gas interface.

[0020] In order to improve the stability of the pneumatic system and the purity of the power gas, for another example Figure 1 As shown in the figure, the utility model is further provided with a filter pressure reducing valve 10. The filter pressure reducing valve 10 is arranged on the second pipeline, and the filter pressure reducing valve 10 functions to stabilize the system pressure and filter impurities.

[0021] In order to reduce the loss of the power gas and lower the use cost of the pneumatic actuator, for another example Figure 1 As shown in the figure, the utility model is further provided with a third pipeline 11. One end of the third pipeline 11 is connected to the third interface of the control valve 1, and the other end of the third pipeline 11 is connected to the exhaust pipeline 7. And the connection part of the third pipeline 11 and the exhaust pipeline 7 is located between the check valve 8 and the exhaust port. After the control valve 1 loses power, under the action of the return elastic member 2 rebounding, the piston rod 5 retracts inward. Part of the power gas in the cylinder block 3 is discharged through the exhaust pipeline 7, and part of the power gas in the cylinder block 3 is discharged through the first pipeline, the control valve 1, the third pipeline 11, and the exhaust pipeline 7. The remaining power gas is stored in each pipeline and the cylinder block 3, realizing that part of the power gas can be recycled in each pipeline and the cylinder block 3, effectively reducing the loss of the power gas and lowering the use cost of the pneumatic actuator

[0022] In order to further improve the service life of the cylinder assembly, the material of the cylinder assembly is stainless steel, such as 304 and 316 stainless steel, or carbon steel with a coating with relatively low cost can also be used.

[0023] The return elastic member 2 functions to rebound and return to the original position. For another example Figure 1 As shown in the figure, the return elastic member 2 is a spring. The return assembly further includes a protective sleeve 12. The return elastic member 2 is arranged in the protective sleeve 12 along the length direction of the protective sleeve 12, and one end of the return elastic member 2 is connected to one side wall of the protective sleeve 12. The other end of the piston rod 5 penetrates into the protective sleeve 12 and is connected to the other end of the return elastic member 2. The protective sleeve 12 can protect the return elastic member 2 and ensure its service life.

[0024] In order to reduce the possibility of the return elastic member 2 deviating during compression and rebound, a guide plate 13 is arranged between the piston rod 5 and the return elastic member 2. The guide plate 13 is arranged in the protective sleeve 12 in a matching manner, and the guide plate 13 can move back and forth along the length direction of the protective sleeve 12.

[0025] In order to reduce the noise during exhaust, a silencer is arranged at the outer end of the exhaust pipeline 7.

Claims

1. A pneumatic actuator for opening and closing a valve, comprising a control valve (1), a cylinder assembly and a return assembly, wherein the return assembly comprises a return elastic member (2), the cylinder assembly comprises a cylinder body (3), a piston (4) and a piston rod (5), wherein the piston (4) is matched and arranged in the cylinder body (3), a gas interface and an exhaust port are arranged on the cylinder body (3), the gas interface and the exhaust port are located on both sides of the piston (4), one end of the piston rod (5) is connected to the piston (4), and the other end of the piston rod (5) passes through the cylinder body (3) and is connected to the return elastic member (2), a movable transmission member (6) adapted to the valve opening and closing transmission member is arranged on the piston rod (5), and the movable transmission member (6) is located between the cylinder body (3) and the return elastic member (2), and a first interface of the control valve (1) is connected to the gas interface through a first pipeline, characterized in that: It also comprises an exhaust pipe (7) and a check valve (8); the exhaust pipe (7) is connected to the exhaust port, and the check valve (8) is arranged on the exhaust pipe (7).

2. The pneumatic actuator for opening and closing a valve according to claim 1, characterized in that: The control valve (1) is a two-position three-way electromagnetic valve.

3. The pneumatic actuator for opening and closing a valve as claimed in claim 2, characterized in that: It also includes an air source (9), which is connected to the second interface of the control valve (1) through a second pipeline.

4. The pneumatic actuator for opening and closing a valve as claimed in claim 3, characterized in that: It also comprises a filter pressure reducing valve (10), which is arranged on the second pipeline.

5. The pneumatic actuator for opening and closing a valve as claimed in claim 2, characterized in that: It also comprises a third pipeline (11), one end of the third pipeline (11) is connected to the third interface of the control valve (1), the other end of the third pipeline (11) is connected to the exhaust pipeline (7), and the connection between the third pipeline (11) and the exhaust pipeline (7) is located between the check valve (8) and the exhaust port.

6. The pneumatic actuator for opening and closing a valve according to claim 1, characterized in that: The cylinder assembly is made of stainless steel.

7. The pneumatic actuator for opening and closing a valve according to claim 1, characterized in that: The return elastic member (2) is a spring, and the return assembly further comprises a protective sleeve (12). The return elastic member (2) is arranged in the protective sleeve (12) along the length direction of the protective sleeve (12), and one end of the return elastic member (2) is connected to a side wall of the protective sleeve (12), and the other end of the piston rod (5) penetrates into the protective sleeve (12) and is connected to the other end of the return elastic member (2).

8. The pneumatic actuator for opening and closing a valve according to claim 7, characterized in that: A guide plate (13) is arranged between the piston rod (5) and the return elastic member (2); the guide plate (13) is matched and arranged in the protective sleeve (12), and the guide plate (13) can move back and forth along the length direction of the protective sleeve (12).

9. The pneumatic actuator for opening and closing a valve according to any one of claims 1 to 8, characterized in that: A silencer is arranged at the outer end of the exhaust pipe (7).

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