CN217440919U

CN217440919U - Single-action three-position type pneumatic actuator

Info

Publication number: CN217440919U
Application number: CN202220962722.5U
Authority: CN
Inventors: 朱振华
Original assignee: Wuxi Xinming Automatic Control Valve Co ltd
Current assignee: Wuxi Xinming Automatic Control Valve Co ltd
Priority date: 2022-04-25
Filing date: 2022-04-25
Publication date: 2022-09-16
Anticipated expiration: 2032-04-25

Abstract

The utility model discloses a single-action three-position pneumatic actuator, including the main cylinder body, the left and right sides of main cylinder body is connected with vice cylinder body, separate through intermediate baffle between main cylinder body and two vice cylinder bodies, be equipped with the axis of rotation in the main cylinder body, the symmetrical meshing main piston in the axis of rotation, the activity is provided with vice piston in the vice cylinder body, install the push rod on the vice piston, the one end of push rod is passed in the intermediate baffle and is stretched into in the main cylinder body, be equipped with the elasticity subassembly that resets between the outside of main piston and the intermediate baffle, vice piston separates vice cylinder body for first cavity and second cavity, the main cylinder body separates for inner chamber and exocoel through main piston, atmospheric pressure in the first cavity is greater than inner chamber atmospheric pressure and makes pneumatic actuator be in the intermediate position. The utility model discloses single-action three-position formula pneumatic actuator can ensure that it is accurate to open the position on the pneumatic actuator three positions, can reply initial position, long service life, safe and reliable after the outage of cutting off the gas.

Description

Single-action three-position type pneumatic actuator

Technical Field

The utility model relates to a pneumatic actuator field especially relates to a single-action three-position formula pneumatic actuator.

Background

The pneumatic actuator is an indispensable actuating mechanism in a process automation control system, and has large using amount and wide application. The pneumatic actuator is an actuating device for opening and closing or adjusting a valve by air pressure, is also called a pneumatic actuating mechanism or a pneumatic device, is generally called a pneumatic head, is sometimes provided with a certain auxiliary device, and is commonly used with a valve positioner and a hand wheel mechanism.

The existing pneumatic actuator is widely applied to mechanical production, however, the existing pneumatic actuator is easy to have the following defects in the using process, firstly, the existing starting mechanism is difficult to control the device to automatically return to the original point, and the control position is easy to cause inaccuracy; secondly, the existing starting mechanism is difficult to reset and protect when the gas and the electricity are cut off, so that the machine is easy to break down.

Disclosure of Invention

The utility model discloses the main technical problem who solves provides a three-position formula pneumatic actuator of nonoculture, can ensure to open the position on the pneumatic actuator three positions accurate, can answer initial position, long service life, safe and reliable after the outage of cutting off the gas.

In order to solve the technical problem, the utility model discloses a technical scheme be: the single-action three-position pneumatic actuator comprises a main cylinder body, wherein auxiliary cylinder bodies are connected to the left side and the right side of the main cylinder body, the main cylinder body is separated from the two auxiliary cylinder bodies through an intermediate baffle, a rotating shaft is arranged in the main cylinder body, a main piston is symmetrically meshed with the rotating shaft, an auxiliary piston is movably arranged in each auxiliary cylinder body, a push rod is installed on each auxiliary piston, one end of each push rod penetrates through the intermediate baffle and extends into the main cylinder body, an elastic reset assembly is arranged between the outer side of the main piston and the intermediate baffle, each auxiliary cylinder body is separated into a first cavity and a second cavity by the corresponding auxiliary piston, the main cylinder body is separated into an inner cavity and an outer cavity by the corresponding main piston, and the pneumatic actuator is located at the intermediate position due to the fact that the air pressure in the first cavity is greater than the air pressure in the inner cavity.

In a preferred embodiment of the present invention, the first chamber first admits air to move the secondary piston inward, and the inner chamber delays the admission air to move the primary piston outward until the push rod contacts the primary piston to move the pneumatic actuator to the neutral position.

In a preferred embodiment of the present invention, the inner chamber and the first chamber are filled with air, the push rod is in contact with the main piston, and the pressure of the inner chamber is less than the thrust of the first chamber and the elastic reset assembly, thereby the pneumatic actuator is in the intermediate position.

In a preferred embodiment of the present invention, the main cylinder is provided with an air inlet communicating with the inner chamber and an air outlet communicating with the outer chamber.

In a preferred embodiment of the present invention, the secondary cylinder has a first air port and a second air port formed thereon, the first air port is communicated with the first cavity, and the second air port is communicated with the second cavity.

In a preferred embodiment of the present invention, the second air port is a breathing port, and a silencer is installed on the second air port.

In a preferred embodiment of the present invention, the elastic return assembly comprises a plurality of springs, one end of each of which is connected to the side wall of the intermediate baffle, and the other end of each of which is connected to the side wall of the main piston.

In a preferred embodiment of the present invention, the secondary cylinder and the intermediate baffle are detachably connected to the main cylinder by bolts.

The beneficial effects of the utility model are that: the utility model discloses single-action three-position formula pneumatic actuator ventilates or cuts off the gas through first cavity and inner chamber and realizes the switching of full-open, full-closed and intermediate position, and the switch mode is simple, and the position is accurate, safe and reliable.

The utility model discloses single-action three-position formula pneumatic actuator, the time of admitting air and the atmospheric pressure that admits air of the first cavity of control and inner chamber realize opening of intermediate position, have two kinds of different opening modes, can guarantee that the position of opening is accurate, and control is simple.

The utility model discloses pneumatic actuator of single-action three-position formula guarantees through the elasticity subassembly that resets that pneumatic actuator after the outage of cutting off the gas resumes initial position, through bolted connection between vice cylinder body, middle baffle and the main cylinder body, makes things convenient for later maintenance and change parts.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained without inventive work, wherein:

FIG. 1 is a schematic structural view of a preferred embodiment of a single-acting three-position pneumatic actuator according to the present invention;

FIG. 2 is a schematic view of a neutral position of a single-acting three-position pneumatic actuator;

FIG. 3 is a schematic view of a fully open position of a single-acting three-position pneumatic actuator;

FIG. 4 is a schematic perspective view of a single-acting three-position pneumatic actuator;

the parts in the drawings are numbered as follows: 1. the piston type piston engine comprises a main cylinder body, 11, a rotating shaft, 12, a main piston, 13, an elastic reset assembly, 14, an inner cavity, 15, an outer cavity, 16, an air inlet, 17, an air outlet, 2, an auxiliary cylinder body, 21, an auxiliary piston, 22, a push rod, 23, a first cavity, 24, a second cavity, 25, a first air port, 26, a second air port, 3, an intermediate baffle, 4 and a bolt.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below. The structure, ratio, size and the like shown in the drawings of the present specification are only used for matching with the content disclosed in the specification, so as to be known and read by people familiar with the technology, and are not used for limiting the limit conditions which can be implemented by the present invention, so that the present invention does not have the substantial significance in the technology, and any structure modification, ratio relationship change or size adjustment should still fall within the scope which can be covered by the technical content disclosed by the present invention without affecting the efficacy which can be produced by the present invention and the achievable purpose. In addition, the terms "upper", "lower", "left", "right" and "middle" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.

Referring to fig. 1 to 3, a single-acting three-position pneumatic actuator includes a main cylinder 1, auxiliary cylinders 2 connected to left and right sides of the main cylinder 1, and the main cylinder 1 and the two auxiliary cylinders 2 are separated by an intermediate baffle 3. The auxiliary cylinder body 2 and the intermediate baffle 3 are detachably connected to the main cylinder body 1 through bolts 4. The connection mode is convenient for later maintenance, and accessories can be replaced more conveniently when local damage occurs.

A rotating shaft 11 is arranged in the main cylinder body 1, and a main piston 12 is symmetrically meshed on the rotating shaft 11. An elastic return assembly 13 is arranged between the outer side of the main piston 12 and the middle baffle plate 3. The elastic return assembly 13 comprises a plurality of springs, one end of which is connected to the side wall of the intermediate baffle 3 and the other end of which is connected to the side wall of the main piston 12. The spring hand compresses after the main piston 12 moves outward, creating resistance to the main piston 12, which can reduce the error when reaching the neutral position. Under the condition of air and power failure, the spring provides thrust for the resetting of the main piston 12, so that the pneumatic actuator is convenient to reset.

An auxiliary piston 21 is movably arranged in the auxiliary cylinder body 2, a push rod 22 is arranged on the auxiliary piston 21, and one end of the push rod 22 penetrates through the middle baffle 3 and extends into the main cylinder body 1. The auxiliary piston 21 divides the auxiliary cylinder 2 into a first cavity 23 and a second cavity 24, the auxiliary cylinder 2 is provided with a first air port 25 and a second air port 26, the first air port 25 is communicated with the first cavity 23, and the second air port 26 is communicated with the second cavity 24. The second air port 26 is a breathing port and a silencer is mounted on the second air port. The second port 26 is typically used as the port 17 to reduce the noise of the exhaust gas by a silencer.

The main cylinder 1 is divided into an inner chamber 14 and an outer chamber 15 by a main piston 12. The main cylinder 1 is provided with an air inlet 16 communicating with the inner chamber 14 and an air outlet 17 communicating with the outer chamber 15. The air pressure in the first chamber 23 is greater than the air pressure in the inner chamber 14 to place the pneumatic actuator in the neutral position.

FIG. 1 shows the fully closed position of the pneumatically actuated valve with all ports uninflated.

Fig. 2 shows the pneumatic actuator valve opened to a given intermediate position, the first port 25 is filled with air, the air enters the first chamber 23, the air in the first chamber 23 moves the secondary piston 21 inward, and the air in the second chamber 24 is exhausted through the second port 26. After the first air port 25 admits air for a short time, the air inlet 16 begins to admit air, the air in the inner cavity 14 pushes the main piston 12 to move outwards, the spring return assembly is compressed in the moving process until the push rod 22 is in contact with the main piston 12, the sum of the thrust of the spring in the first cavity 23 is equal to the pressure in the inner cavity 14, and the spring return assembly is in a balanced state, at the moment, the rotating shaft 11 just rotates 45 degrees, and in this case, the pneumatic actuator is opened to the middle position.

Fig. 3 shows the pneumatic actuator valve in a fully open state, wherein on the basis of the intermediate position, the first air port 25 stops air intake, the air inlet 16 continues air intake, the main piston 12 moves outward, the push rod 22 is pushed, and the push rod 22 drives the auxiliary piston 21 to move outward until the main piston 12 moves to the limit position, at which time the rotating shaft rotates 90 °.

Then the first air port 25 is filled again, the pressure of the first air port 25 is greater than the pressure of the inlet 16, and the pressure is 0.05Mpa, at this time, the auxiliary piston 21 moves inwards again, and the push rod 22 pushes the main piston 12 to move inwards, and the middle position state of fig. 2 is returned. The action switching of the pneumatic actuator from 0 degree to 45 degrees to 90 degrees to 45 degrees can be realized, and the action process of the pneumatic actuator is simplified.

Be different from prior art, the utility model discloses three-position formula pneumatic actuator of single action can ensure that it is accurate to open the position on the pneumatic actuator three positions, can reply initial position, long service life, safe and reliable after the outage of cutting off the gas.

The present invention and its embodiments have been described above schematically, and the description is not limited thereto, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if a person skilled in the art should understand that without departing from the spirit of the present invention, the person skilled in the art should not inventively design the similar structural modes and embodiments to the technical solution, and all shall fall within the protection scope of the present invention.

Claims

1. The single-action three-position pneumatic actuator is characterized in that an auxiliary piston is movably arranged in the auxiliary cylinder, a push rod is mounted on the auxiliary piston, one end of the push rod penetrates through the middle baffle and extends into the main cylinder, an elastic reset component is arranged between the outer side of the main piston and the middle baffle, the auxiliary piston divides the auxiliary cylinder into a first cavity and a second cavity, the main cylinder is divided into an inner cavity and an outer cavity by the main piston, and air pressure in the first cavity is greater than air pressure in the inner cavity so that the pneumatic actuator is located at the middle position.

2. The single-acting three-position pneumatic actuator according to claim 1, wherein the first chamber admits air to move the secondary piston inwardly, and the chamber admits air to move the primary piston outwardly until the push rod contacts the primary piston to move the pneumatic actuator to the neutral position.

3. The single-acting three-position pneumatic actuator according to claim 1, wherein the inner chamber and the first chamber are filled with air, the push rod is in contact with the master piston, and the pressure of the inner chamber is less than the thrust of the first chamber and the elastic return member to thereby cause the pneumatic actuator to assume the neutral position.

4. A single-acting three-position pneumatic actuator according to any one of claims 1 to 3, wherein the main cylinder is provided with an air inlet communicating with the inner chamber and an air outlet communicating with the outer chamber.

5. The single-acting three-position pneumatic actuator according to claim 4, wherein the secondary cylinder defines a first air port and a second air port, the first air port communicating with the first chamber, the second air port communicating with the second chamber.

6. The single-acting three-position pneumatic actuator according to claim 5, wherein the second air port is a breathing port, and a silencer is mounted on the second air port.

7. The single-acting, three-position pneumatic actuator according to claim 1 wherein the resilient return assembly comprises a plurality of springs having one end attached to the side wall of the intermediate stop and the other end attached to the side wall of the main piston.

8. The single-acting three-position pneumatic actuator according to claim 7, wherein the sub-cylinder and the intermediate diaphragm are detachably connected to the main cylinder by bolts.