CN108468856A - Single-acting air spring pneumatic actuator - Google Patents

Abstract

The invention discloses a single-acting air spring pneumatic actuator, which includes an actuator cylinder body, the actuator cylinder body is cylindrical, and a piston capable of moving up and down is installed inside the actuator cylinder body. The interior of the actuator cylinder includes a rodless chamber above the piston and a rod chamber below the piston. The top of the actuator cylinder is fixed with an upper cover by fixing bolts, and an air vent is also opened on the upper cover. , the piston is also connected with a locknut. This actuator can adapt to the requirements of special working conditions and meet the requirements of quick start. The actuator has a self-protection function when the power source is missing, ensuring the check function of the valve. This actuator can be used in check valves and other valves. After the actuator is matched with the valve, it has multiple control functions such as remote control and local control, which can reduce labor intensity. The working medium of this actuator can not only use compressed air, but also hydraulic oil.

Description

Single acting air spring pneumatic actuator

technical field

The invention relates to the technical field of pneumatic actuators, in particular to a single-acting air spring pneumatic actuator.

Background technique

Pneumatic actuator is an actuator that uses a certain pressure of compressed air to drive the valve to complete the opening and closing or adjustment. Existing pneumatic actuators are mainly divided into structures such as film type, piston type, shift fork type and rack and pinion type. These structural types are widely used in valves. However, considering the special working conditions required in the use of the ship cabin system, it is difficult for the above independent structural forms to meet the use requirements. This needs to improve the structural form of the actuator, and add some auxiliary components such as springs to complete the protection function.

Contents of the invention

The purpose of the present invention is to provide a single-acting air spring pneumatic actuator to solve the problems raised in the above-mentioned background technology.

In order to achieve the above object, the present invention provides the following technical solutions: a single-acting air spring pneumatic actuator, including an actuator cylinder, the actuator cylinder is cylindrical, and the inside of the actuator cylinder is equipped with a The piston moves up and down. The interior of the actuator cylinder includes a rodless chamber above the piston and a rod chamber below the piston. The top of the actuator cylinder is fixed with an upper cover by fixing bolts. The upper The cross-section of the cover is circular, and four sets of return springs are installed inside the rodless chamber of the cylinder. The lower surface of the upper cover and the upper surface of the piston are correspondingly provided with positioning holes for fixing the return springs. A spring adjusting screw rod is installed on the cover, an air vent is opened on the upper cover, and a lock nut is connected to the piston.

As a further optimization of the technical solution, the present invention is a single-acting air spring pneumatic actuator, the contact between the upper cover and the cylinder body of the actuator is provided with an upper end cover sealing ring, and the upper end cover sealing ring is an O-shaped seal ring, and at least two sets of sealing rings are provided on the upper end cover.

As a further optimization of the technical solution, the present invention is a single-acting air spring pneumatic actuator, the cross-section of the piston is circular, and a piston sealing ring is provided at the contact between the piston and the inner wall of the cylinder of the actuator. There are at least two groups of piston sealing rings.

As a further optimization of the technical solution, the present invention is a single-acting air spring pneumatic actuator, the bottom end of the spring adjustment screw extends into the rodless chamber of the cylinder.

As a further optimization of the technical solution, the present invention is a single-acting air spring pneumatic actuator, the spring adjustment screw is located in the middle of the upper cover, and the locknut is located in the middle of the piston.

Compared with prior art, the beneficial effect of the present invention is:

1) The actuator can adapt to the requirements of special working conditions and meet the requirements of quick start;

2) The actuator has a self-protection function when the power source is missing, ensuring the check function of the valve;

3) This actuator can be used in valves such as check valves;

4) After the actuator is matched with the valve, it has multiple control functions such as remote control and local control, which can reduce labor intensity;

5) The working medium of this actuator can not only use compressed air, but also hydraulic oil.

Description of drawings

Fig. 1 is the structural representation of a kind of single-acting air spring pneumatic actuator of the present invention;

Fig. 2 is a schematic structural view of a single-acting air spring pneumatic actuator of the present invention when used in conjunction with a check valve.

In the figure: 1 upper cover, 2 return spring, 3 upper end cover sealing ring, 4 actuator cylinder, 5 piston sealing ring, 6 piston, 7 fixing bolt, 8 spring adjusting screw, 9 air vent, 10 cylinder rodless chamber , 11 cylinders with rod cavity, 12 locknuts.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Please refer to Figures 1-2, the present invention provides a technical solution: a single-acting air spring pneumatic actuator, including an actuator cylinder 4, the actuator cylinder 4 is cylindrical, and the actuator cylinder The inside of 4 is equipped with a piston 6 that can move up and down. The inside of the actuator cylinder 4 includes a rodless cavity 10 above the piston 6 and a rod cavity 11 below the piston 6. The actuator cylinder 4 The top is fixed with an upper cover 1 by fixing bolts 7, the section of the upper cover 1 is circular, and four groups of return springs 2 are installed inside the cylinder rodless cavity 10, the lower surface of the upper cover 1 and The upper surface of the piston 6 is correspondingly provided with a positioning hole for fixing the return spring 2, and a spring adjustment screw 8 is installed on the upper cover 1, and an air vent 9 is also provided on the upper cover 1, and a vent 9 is provided on the upper cover 1 of the piston 6. A lock nut 12 is also connected.

Specifically, an upper end cover sealing ring 3 is provided at the contact between the upper cover 1 and the actuator cylinder 4, the upper end cover sealing ring 3 is an O-shaped sealing ring, and the upper end cover sealing ring 3 is provided with at least two groups .

Specifically, the cross section of the piston 6 is circular, and a piston sealing ring 5 is provided at the contact between the piston 6 and the inner wall of the actuator cylinder 4, and at least two groups of the piston sealing rings 5 are provided.

Specifically, the bottom end of the spring adjustment screw 8 extends into the rodless chamber 10 of the cylinder.

Specifically, the spring adjustment screw 8 is located in the middle of the upper cover 1 , and the locknut 12 is located in the middle of the piston 6 .

Working principle: The present invention is a single-acting air spring pneumatic actuator. When in use, the actuator is single-acting and has a return spring 2, which is mainly used for the opening and closing of the valve disc when it loses air.

The actuator is an integrated cylinder, which consists of a spring chamber (cylinder rodless chamber 10) on the upper part of the piston 6 and a lower piston chamber (cylinder rod chamber 11), which are isolated by the piston 6. Air vent 9 is arranged on the upper part or next to cylinder rodless chamber 10 for ventilation when back-moving spring 2 works. The return spring 2 of the actuator has both auxiliary and working functions. During normal operation, compressed air enters the rod chamber 11 of the cylinder, and the piston 6 moves upward. Under the action of the compressed air, it overcomes the spring force, lifts the valve disc, and the valve works.

When the air source is lost, the return spring 2 is used as a protection element to ensure that the valve disc is in a compressed and sealed state. At this time, the elastic force of the return spring 2 can protect the valve disc from being lifted and ensure the non-return function of the valve.

The actuator is designed to be used in connection with the check valve, and the actuator is connected to the actuator through a yoke when mating with the valve. In order to shorten the structural size, the yoke acts as the bottom cover of the actuator. The yoke and valve body are positioned with "tight fit bolts" to meet the positional requirements of the valve and actuator and ensure the sealing performance of the valve and actuator. The scale indicating the opening position of the valve disc is set on the yoke, as well as the limit switch and junction box for the opening and closing positions of the valve disc with IP65 protection level.

The design pressure of the actuator is 3.0Mpa, the design temperature is 60°C, the working pressure is 0.5-2.0Mpa, the outer diameter of the actuator cylinder 4 is 240mm, and the overall height is 340mm.

The piston 6 and the piston rod adopt an airtight design structure, and the end of the piston rod is threaded, and is connected with the piston by a locknut 12 .

The actuator cylinder, end cover, bolts and yoke are made of pressure vessel seamless steel pipe, plate and forged steel material standard, the grade is S31603.

Although the embodiments of the present invention have been shown and described, those skilled in the art can understand that various changes, modifications and substitutions can be made to these embodiments without departing from the principle and spirit of the present invention. and modifications, the scope of the invention is defined by the appended claims and their equivalents.

Claims (5)

1. a kind of single-acting air spring pneumatic actuator, including actuator cylinder body (4), it is characterised in that：The actuator cylinder Body (4) is cylindrical, and the inside of the actuator cylinder body (4) is equipped with the piston (6) that can be moved up and down, the actuator cylinder The inside of body (4) includes cylinder rodless cavity (10) and piston (6) the cylinder rod chamber (11) below of piston (6) or more, institute The top for stating actuator cylinder body (4) is fixed with upper capping (1) by fixing bolt (7), and the section of the upper capping (1) is circle Shape, the cylinder rodless cavity (10) is internal to be equipped with four groups of resetting springs (2), the lower surface of the upper capping (1) and piston (6) upper surface corresponds to the location hole offered for fixed reset spring (2), and spring tune is equipped on the upper capping (1) Screw rod (8) is saved, blow vent (9) is further opened on the upper capping (1), stop nut (12) is also associated on the piston (6).

2. a kind of single-acting spring reset pressure balance type pneumatic actuator according to claim 1, it is characterised in that：Institute The contact position for stating capping (1) and actuator cylinder body (4) is equipped with upper end cover sealing ring (3), and the upper end cover sealing ring (3) is O Type sealing ring, the upper end cover sealing ring (3) are at least arranged two groups.

3. a kind of single-acting spring reset pressure balance type pneumatic actuator according to claim 1, it is characterised in that：Institute The cross section for stating piston (6) is round, and the contact position of the piston (6) and actuator cylinder body (4) inner wall is equipped with piston packing (5), the piston packing (5) is at least arranged two groups.

4. a kind of single-acting spring reset pressure balance type pneumatic actuator according to claim 1, it is characterised in that：Institute The bottom end for stating spring adjusting screw rod (8) extends in cylinder rodless cavity (10).

5. a kind of single-acting spring reset pressure balance type pneumatic actuator according to claim 1, it is characterised in that：Institute The middle part that spring adjusting screw rod (8) is located at upper capping (1) is stated, the stop nut (12) is located at the middle part of piston (6).