CN217977661U

CN217977661U - Pneumatic actuating mechanism

Info

Publication number: CN217977661U
Application number: CN202221722240.9U
Authority: CN
Inventors: 何楚天; 陈君; 胡冰
Original assignee: Wuxi Aishengtuoke Fluid Control Co ltd
Current assignee: Wuxi Aishengtuoke Fluid Control Co ltd
Priority date: 2022-07-05
Filing date: 2022-07-05
Publication date: 2022-12-06
Anticipated expiration: 2032-07-05

Abstract

The utility model discloses a pneumatic actuator relates to pneumatic actuator technical field. The piston is connected with the cylinder body of the mechanism in a sliding mode, the sealing ring is sleeved on the edge of the piston, the cylinder body is divided into a middle air cavity at the middle position and two side air cavities at two side positions of the cylinder body, an air hole A is communicated into the middle air cavity, an air hole B is communicated into the two side air cavities, an air hole C is arranged at the other side in the cylinder body and communicated into the two side air cavities, the air hole C is used for releasing air in the air cavities under the air channeling condition, a closed part used for closing the air hole C is detachably connected onto the air hole C, when the air channeling problem occurs to the pneumatic actuator, the air hole C only needs to be opened, after redundant air is removed, the air can enter from the two air holes in normal work, the starting actuator is enabled to restore to normal work, and the problem that when the air channeling occurs, the pneumatic actuator cannot enter air and the valve cannot work is avoided.

Description

Pneumatic actuating mechanism

Technical Field

The utility model relates to a pneumatic actuator technical field especially relates to a pneumatic actuator.

Background

The pneumatic actuator is an actuating device for opening and closing or regulating a valve by using air pressure, is also called a pneumatic actuating mechanism or a pneumatic device, but is generally called a pneumatic head. The pneumatic actuator mainly comprises a cylinder body, a piston, a gear shaft, an end cover, a sealing element, a screw and the like.

As shown in fig. 1 and 2, in the prior art, the pneumatic actuator is divided into two air chambers by a middle sealing ring, which are respectively called a middle air chamber and two side air chambers. When the pneumatic actuating mechanism starts to work, gas directly enters the middle air cavity through the air hole A, the piston moves towards two sides under the action of air pressure, and when the piston moves in place, the gas continuously enters the middle air cavity until the gas is saturated in the middle air cavity.

On the contrary, the gas enters the air passage through the gas hole B and then enters the gas cavities at the two sides through the gas inlet holes at the two sides of the air passage, the piston moves towards the middle under the action of the air pressure, and when the piston moves in place, the gas continuously enters the gas cavities at the two sides until the gas is saturated in the gas cavity at the middle.

In the long-time principle application process, the fact that if the action frequency of the pneumatic actuating mechanism is very low and the service life of the pneumatic actuating mechanism is long is found, the middle sealing ring can lose efficacy gradually under the action of time, and therefore air blowby between the middle air cavity and the air cavities on the two sides is caused.

The normal state of the middle air cavities is saturated, namely air inlet is stopped, and after air blowby occurs, the air source still can continuously inlet air until the air in the two air cavities is completely saturated. At the moment, because all the air cavity volumes in the pneumatic actuating mechanism are fully occupied by air, when the pneumatic actuating mechanism needs to act, the pneumatic actuating mechanism cannot act due to the fact that air cannot be supplied, and therefore the valve driven by the pneumatic actuating mechanism cannot work.

SUMMERY OF THE UTILITY MODEL

The utility model aims at the above-mentioned technical problem, overcome prior art's shortcoming, provide a pneumatic actuator.

In order to solve the technical problem, the utility model provides a pneumatic actuator.

The technical effects are as follows: establish between original two gas pockets and be used for urgent carminative gas pocket C and exhaust passage, the problem of scurring gas has been solved, when the pneumatic actuator takes place the scurring gas problem, only need to open gas pocket C, gas in the gas pocket outwards reveals via gas pocket C, get rid of behind the unnecessary gas, the air pressure reduces for the normal condition in the gas pocket, seal gas pocket C this moment, gas gets into again in can following two gas pockets of normal work, make the start actuator resume normal work, when avoiding the scurring gas problem to take place, pneumatic actuator can't admit air and the unable work of valve that leads to.

The utility model discloses the technical scheme who further injects is: the utility model provides a pneumatic actuator, comprising a cylinder body, gas pocket A and gas pocket B in the cylinder body are located to the intercommunication, it is connected with the piston to slide in the cylinder body, the sealing washer is established to piston edge cover, with the inside middle air cavity of splitting into the intermediate position of cylinder body and the both sides air cavity that is located cylinder body both sides position, gas pocket A communicates to the middle air cavity, gas pocket B communicates to the both sides air cavity in, gas pocket C has been seted up to the opposite side in the cylinder body, gas pocket C communicates to the both sides air cavity, be used for releasing gaseous intracavity gas under the gas channeling circumstances, can dismantle on the gas pocket C and be connected with and be used for its confined enclosure.

Furthermore, the exhaust passages are arranged in the cylinder body and distributed along the direction of the cylinder body, two ends of the middle air cavity are respectively communicated to the air cavities at two sides of the cylinder body, the middle position of the cylinder body is communicated to the air hole C, and the air hole C is communicated to the outside.

The sealing piece of the pneumatic actuating mechanism comprises a sealing screw, and the sealing screw penetrates through the air hole C and is in threaded connection with the air hole C to seal the air hole C.

The sealing piece comprises a sealing cover, the sealing cover is sleeved at one end of the air hole C, which is located outside, and is fixed with the air hole C through threads, and a sealing gasket is arranged in the sealing cover.

In the pneumatic actuating mechanism, the air hole A and the air hole B are arranged on the same side of the cylinder body, and the air hole C is arranged on the other side of the cylinder body.

The beneficial effects of the utility model are that:

(1) In the utility model, the air hole C and the exhaust passage for emergency exhaust are arranged between the two original air holes, the problem of air channeling is solved, when the air channeling problem occurs in the pneumatic actuator, the air hole C only needs to be opened, the gas in the air cavity is outwards leaked through the air hole C, after the redundant gas is removed, the air pressure in the air cavity is reduced to be a normal condition, the air hole C is closed at the moment, the gas can enter from the two air holes in normal work, and the start actuator is enabled to recover to normal work;

(2) In the utility model, the exhaust passage and the air hole C are arranged on one side of the cylinder body far away from the air hole A and the air hole B, when the air hole C is needed to be used, an operator can manually open the sealing piece on the air hole C, the air in the air cavities at two sides can be discharged outside through the exhaust passage and the air hole C, the air pressure in the cylinder body is balanced, and the normal use of the pneumatic actuating mechanism after air blowby is ensured;

(3) In the utility model, the air hole C is sealed by the sealing screw, so that the operator can conveniently and quickly open the air hole C for exhausting, the operation efficiency is improved, and the sealing performance can be improved by sealing the air hole C by the sealing cover and the sealing gasket, thereby avoiding the occurrence of air leakage;

(4) The utility model discloses in, increased gas pocket C and exhaust passage, when the pneumatic actuator takes place the blowby problem, only need open gas pocket C, get rid of unnecessary gaseous back, gaseous getting into again in two gas pockets of normal work, make the start actuator resume normal work, when avoiding when the blowby problem takes place, pneumatic actuator can't admit air and the unable work of valve that leads to.

Drawings

FIG. 1 is a diagram of a prior art vent A;

FIG. 2 is a view showing a structure of a vent B in the prior art;

FIG. 3 is a top view of example 1;

FIG. 4 is a structural view of embodiment 1;

fig. 5 is a cross-sectional view of the cylinder.

Wherein: 1. a cylinder body; 11. air holes A; 12. an air hole B; 13. an intermediate air cavity; 14. air cavities on two sides; 2. A piston; 21. a seal ring; 3. air holes C; 31. an exhaust passage; 4. and (4) a closing part.

Detailed Description

The pneumatic actuator provided by the embodiment has a structure shown in fig. 3-5, and comprises a cylinder body 1, and an air hole a11 and an air hole B12 which are communicated with each other and arranged in the cylinder body 1, wherein a piston 2 is connected in the cylinder body 1 in a sliding manner, a sealing ring 21 is sleeved on the edge of the piston 2, and the interior of the cylinder body 1 is divided into a middle air cavity 13 at the middle position and two side air cavities 14 at the two side positions of the cylinder body 1.

As shown in fig. 3-5, the air hole a11 communicates with the middle air cavity 13, the air hole B12 communicates with the two side air cavities 14, the other side of the cylinder body 1 is provided with an air hole C3, the air hole C3 communicates with the two side air cavities 14 for releasing air in the air cavities under the condition of air blow-by, and the air hole C3 is detachably connected with a sealing element 4 for sealing the air hole C3. The air hole A11 and the air hole B12 are arranged on the same side of the cylinder body 1, and the air hole C3 is arranged on the other side of the cylinder body 1.

As shown in fig. 3-5, the cylinder body is provided with exhaust passages 31, the exhaust passages 31 are distributed along the direction of the cylinder body, two ends of the middle air cavity 13 are respectively communicated with the two side air cavities 14 at two side positions in the cylinder body, the middle position of the cylinder body is communicated with an air hole C3, and the air hole C3 is communicated with the outside.

As shown in fig. 3 to 5, the sealing element 4 includes a sealing screw or a sealing cover, and when the sealing element 4 is a sealing screw, the sealing screw is inserted into the air hole C3 and connected with the air hole C3 by a screw thread, so as to seal the air hole C3. When the closing piece 4 is a sealing cover, the sealing cover is sleeved at one end of the air hole C3, which is positioned outside, and is fixed with the air hole C3 through threads, and a sealing gasket is arranged in the sealing cover.

This pneumatic actuator has been established between original two gas pockets and has been used for urgent carminative gas pocket C3 and exhaust passage 31, the problem of scurring gas has been solved, when the pneumatic actuator takes place the scurring gas problem, only need open gas pocket C3, gas in the air pocket outwards reveals via gas pocket C3, get rid of behind the unnecessary gas, the air pressure reduces to the normal condition in the air pocket, seal gas pocket C3 this moment, gas can get into from two gas pockets of normal work again, make the start actuator resume normal work, thereby avoid when the scurring gas problem takes place, pneumatic actuator can't admit air and the unable work of valve that leads to.

In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent replacement or equivalent transformation fall within the protection scope required by the utility model.

Claims

1. The utility model provides a pneumatic actuator, includes cylinder body (1), intercommunication locate gas pocket A (11) and gas pocket B (12) in cylinder body (1), its characterized in that: the cylinder body (1) internal slipping is connected with piston (2), sealing washer (21) are established to piston (2) edge cover, with cylinder body (1) inside middle air cavity (13) and both sides air cavity (14) that are located cylinder body (1) both sides position of cutting apart into the intermediate position, gas pocket A (11) communicate to in middle air cavity (13), gas pocket B (12) communicate to in both sides air cavity (14), gas pocket C (3) have been seted up to the opposite side in cylinder body (1), gas pocket C (3) communicate to in both sides air cavity (14), be used for releasing the gas intracavity gas under the blowby circumstances, can dismantle on gas pocket C (3) and be connected with and be used for its confined enclosure (4).

2. A pneumatic actuator according to claim 1, wherein: an exhaust passage (31) is arranged in the cylinder body, the exhaust passage (31) is distributed along the direction of the cylinder body, two ends of the middle air cavity (13) are respectively communicated to the air cavities (14) at two sides in the cylinder body, the middle position of the cylinder body is communicated to an air hole C (3), and the air hole C (3) is communicated to the outside.

3. A pneumatic actuator according to claim 1, wherein: the closing piece (4) comprises a closing screw, and the closing screw penetrates through the air hole C (3) and is in threaded connection with the air hole C (3) and used for closing the air hole C (3).

4. A pneumatic actuator according to claim 1, wherein: the sealing piece (4) comprises a sealing cover, the sealing cover is sleeved at one end of the air hole C (3) located outside and fixed with the air hole C (3) through threads, and a sealing gasket is arranged in the sealing cover.

5. A pneumatic actuator according to claim 1, wherein: the air hole A (11) and the air hole B (12) are arranged on the same side of the cylinder body (1), and the air hole C (3) is arranged on the other side of the cylinder body (1).