CN219510243U

CN219510243U - Buffering structure of pneumatic actuator

Info

Publication number: CN219510243U
Application number: CN202320816629.8U
Authority: CN
Inventors: 苏磊; 卞红飞
Original assignee: Wuxi Boniu Control Valve Co ltd
Current assignee: Wuxi Boniu Control Valve Co ltd
Priority date: 2023-04-13
Filing date: 2023-04-13
Publication date: 2023-08-11
Anticipated expiration: 2033-04-13

Abstract

The utility model relates to a pneumatic actuator buffer structure, which comprises a cylinder body and a large piston slidably arranged in the cylinder body, wherein a first sealing ring is arranged on the outer circle of the large piston, a piston rod is fixed on the right end face of the large piston, the piston rod penetrates through the right side plate of the cylinder body, a first air port is formed in the right side plate of the cylinder body, and a second air port is formed in the left side plate of the cylinder body; the inner wall of the cylinder body between the large piston and the left side plate of the cylinder body is fixed with a buffer plate, a first exhaust port is formed in the buffer plate, a buffer cavity is formed in the right side face of the buffer plate, a second exhaust port is formed in the buffer plate corresponding to the bottom face of the buffer cavity, a small piston is fixed on the left side face of the large piston, and a second sealing ring is arranged on the outer circle of the small piston. The utility model not only buffers the impact between the parts in the cylinder, but also effectively protects the sealing surface of the valve, so that the whole action of the cylinder is stable and reliable.

Description

Buffering structure of pneumatic actuator

Technical Field

The utility model relates to the technical field of valve structures, in particular to a buffer structure of a pneumatic actuator.

Background

The pneumatic actuator is used for opening and closing the valve, takes compressed air as a power source, has the advantages of simple operation, quick response, high safety and wide application, and does not need additional explosion-proof measures. The pneumatic actuator mainly comprises a single-acting cylinder and a double-acting cylinder. The single-action cylinder is mainly fed by the cylinder to push the piston rod to drive the shifting fork to rotate, so that the valve is opened or closed; and after the spring is reset, the valve is closed or opened. The double acting cylinder pushes the piston rod to drive the shifting fork to rotate by totally depending on air inlet and air outlet of the cylinder, so that the valve is opened or closed.

Disclosure of Invention

The utility model aims to overcome the defects in the prior art and provide a buffer structure of a pneumatic actuator, which can enable a valve to be closed more stably and has better sealing effect.

According to the technical scheme provided by the utility model, the pneumatic actuator buffer structure comprises a cylinder body and a large piston slidably mounted in the cylinder body, wherein a first sealing ring mounting groove is formed in the outer circle of the large piston, a first sealing ring is mounted in the first sealing ring mounting groove, a piston rod is fixed on the right end face of the large piston, the piston rod penetrates through the right side plate of the cylinder body, the piston rod is in sliding sealing fit with the right side plate of the cylinder body, a first air port is formed in the right side plate of the cylinder body, and a second air port is formed in the left side plate of the cylinder body;

a buffer plate is fixed on the inner wall of the cylinder body between the large piston and the left side plate of the cylinder body, a distance is reserved between the buffer plate and the left side plate of the cylinder body, a first exhaust port is formed in the buffer plate, a buffer cavity is formed in the right side surface of the buffer plate, a second exhaust port is formed in the buffer plate corresponding to the bottom surface of the buffer cavity, a small piston is fixed on the left side surface of the large piston and is matched with the buffer cavity, a sealing ring mounting groove is formed in the outer circle of the small piston, and a second sealing ring is mounted in the sealing ring mounting groove;

the diameter of the first exhaust port is larger than that of the second exhaust port.

Preferably, the number of the first exhaust ports is at least 3, and the first exhaust ports are uniformly arranged outside the buffer chamber.

Preferably, the cylinder body, the buffer plate, the buffer cavity, the small piston, the large piston and the piston rod are all coaxially arranged.

The utility model not only buffers the impact between the parts in the cylinder, but also effectively protects the sealing surface of the valve, so that the whole action of the cylinder is stable and reliable.

Drawings

Fig. 1 is a schematic structural view of the present utility model.

Fig. 2 is a schematic view of the piston rod position in the cylinder at the start of intake according to the present utility model.

Fig. 3 is a schematic view of the piston rod position in the cylinder during intake of the present utility model.

Fig. 4 is a schematic view of the piston rod position in the cylinder at the end of intake according to the present utility model.

In the utility model, 1 is a cylinder body, 1.1 is a first air port 1.1,1.2 is a second air port, 2 is a buffer plate, 2.1 is a first air outlet 2.1,2.2 is a second air outlet 2.2,2.3 is a buffer cavity, 3.1 is a first sealing ring, 3.2 is a second sealing ring, 4 is a small piston, 5 is a large piston, 6 is a piston rod, 7 is a shifting fork, 8 is a transmission box, 9 is a shifting fork shaft, and 10 is a pin shaft.

Detailed Description

The utility model will be further illustrated with reference to specific examples.

The utility model relates to a buffer structure of a pneumatic actuator, which is shown in figures 1-4, and comprises a cylinder body 1 and a large piston 5 which is slidably arranged in the cylinder body 1, wherein a first sealing ring mounting groove is formed in the outer circle of the large piston 5, a first sealing ring 3.1 is arranged in the first sealing ring mounting groove, a piston rod 6 is fixed on the right end surface of the large piston 5, the piston rod 6 penetrates through the right side plate of the cylinder body 1, the piston rod 6 is in sliding sealing fit with the right side plate of the cylinder body 1, a first air port 1.1 is formed in the right side plate of the cylinder body 1, and a second air port 1.2 is formed in the left side plate of the cylinder body 1;

the inner wall of the cylinder body 1 between the large piston 5 and the left side plate of the cylinder body 1 is fixedly provided with a buffer plate 2, a distance is reserved between the buffer plate 2 and the left side plate of the cylinder body 1, a first exhaust port 2.1 is formed in the buffer plate 2, a buffer cavity 2.3 is formed in the right side surface of the buffer plate 2, a second exhaust port 2.2 is formed in the buffer plate 2 corresponding to the bottom surface of the buffer cavity 2.3, a small piston 4 is fixed on the left side surface of the large piston 5, the small piston 4 is matched with the buffer cavity 2.3, a sealing ring mounting groove is formed in the outer circle of the small piston 4, and a second sealing ring 3.2 is mounted in the sealing ring mounting groove.

The diameter of the first exhaust port 2.1 is larger than the diameter of the second exhaust port 2.2.

The number of the first exhaust ports 2.1 is at least 3, and the first exhaust ports 2.1 are uniformly arranged outside the buffer cavity 2.3.

The cylinder body 1, the buffer plate 2, the buffer cavity 2.3, the small piston 4, the large piston 5 and the piston rod 6 are all coaxially arranged.

When the utility model works, the right side of the cylinder body 1 is provided with a transmission box body 8, a shifting fork 7 is arranged in the transmission box body 8 through a shifting fork shaft 9, and the shifting fork 7 is hinged with the right end of the piston rod 6 through a pin shaft 10.

In the utility model, a sealing ring mounting groove is formed on the outer circle of a small piston 4, a second sealing ring 3.2 is arranged in the sealing ring mounting groove, a first sealing ring mounting groove is formed on the outer circle of a large piston 5, a first sealing ring 3.1 is arranged in the first sealing ring mounting groove, the first sealing ring 3.1 on the large piston 5 and the inner wall of a cylinder body 1 generate elastic extrusion, and the second sealing ring 3.2 on the small piston 4 and the wall body of a buffer cavity 2.3 generate elastic extrusion. The piston rod 6 is matched with the shifting fork 7 through a sliding pair, the shifting fork 7 is arranged in the transmission box body 8, and torque is output through the shifting fork 7.

The working principle of the utility model is as follows:

at the beginning, the large piston 5 is located at the rightmost position, as shown in fig. 2, the air is introduced into the cylinder body 1 through the first air port 1.1 to pressurize, the right side pressure of the large piston 5 increases, and at this time, the air pushes the large piston 5, the small piston 4 and the piston rod 6 to move leftwards. As the air pressure on the right side of the large piston 5 increases continuously, the left movement continues, and the air in the cylinder on the left side of the large piston 5 is discharged through the first air outlet 2.1 and the second air outlet 2.2, and then is discharged from the second air outlet 1.2, as shown in fig. 3. The small piston 4 can then enter the buffer cavity 2.3 on the buffer plate 2, and the flexible obstruction is formed in the moment of the leftward movement due to the elastic extrusion between the second sealing ring 3.2 on the small piston 4 and the wall body of the buffer cavity 2.3 on the buffer plate 2, so that the speed is reduced. The small piston 4 continuously compresses the gas in the buffer cavity 2.3 and the gas is discharged from the second exhaust port 2.2, and the piston slowly and stably moves until the movement stops due to the fact that the sectional area of the second exhaust port 2.2 is greatly reduced, and the speed reduction effect is obviously achieved, as shown in fig. 4. At this time, the valve is in a state that the closing speed is rapidly reduced, and flexible buffering is generated between the sealing surfaces, so that the sealing surfaces are protected. It is not difficult to find out in the whole process that if there is no buffer member composed of the buffer plate 2 and the small piston 4, the large piston 5 will keep a certain speed moving until stopping, and inevitably will cause a speed impact between the sealing surfaces at the moment of valve closing, thereby damaging the sealing surfaces.

Claims

1. A pneumatic actuator buffer structure comprises a cylinder body (1) and a large piston (5) which is slidably mounted in the cylinder body (1), wherein a first sealing ring mounting groove is formed in the outer circle of the large piston (5), a first sealing ring (3.1) is mounted in the first sealing ring mounting groove, a piston rod (6) is fixed on the right end face of the large piston (5), the piston rod (6) penetrates through the right side plate of the cylinder body (1), the piston rod (6) is in sliding sealing fit with the right side plate of the cylinder body (1), a first air port (1.1) is formed in the right side plate of the cylinder body (1), and a second air port (1.2) is formed in the left side plate of the cylinder body (1);

the method is characterized in that: a buffer plate (2) is fixed on the inner wall of the cylinder body (1) between the large piston (5) and the left side plate of the cylinder body (1), a certain distance is reserved between the buffer plate (2) and the left side plate of the cylinder body (1), a first exhaust port (2.1) is formed in the buffer plate (2), a buffer cavity (2.3) is formed in the right side surface of the buffer plate (2), a second exhaust port (2.2) is formed in the buffer plate (2) corresponding to the bottom surface of the buffer cavity (2.3), a small piston (4) is fixed on the left side surface of the large piston (5), the small piston (4) is matched with the buffer cavity (2.3), a sealing ring mounting groove is formed in the outer circle of the small piston (4), and a second sealing ring (3.2) is mounted in the sealing ring mounting groove;

the diameter of the first exhaust port (2.1) is larger than that of the second exhaust port (2.2).

2. The pneumatic actuator cushioning structure of claim 1, wherein: the number of the first exhaust ports (2.1) is at least 3, and the first exhaust ports (2.1) are uniformly arranged on the outer side of the buffer cavity (2.3).

3. The pneumatic actuator cushioning structure of claim 1, wherein: the cylinder body (1), the buffer plate (2), the buffer cavity (2.3), the small piston (4), the large piston (5) and the piston rod (6) are all coaxially arranged.