CN218207304U

CN218207304U - Single-double action piston

Info

Publication number: CN218207304U
Application number: CN202222625941.7U
Authority: CN
Inventors: 李柏和; 孙小龙
Original assignee: Guangdong Feixier Fluid Technology Co ltd
Current assignee: Guangdong Feixier Fluid Technology Co ltd
Priority date: 2022-09-30
Filing date: 2022-09-30
Publication date: 2023-01-03
Anticipated expiration: 2032-09-30

Abstract

The utility model relates to a piston technical field especially relates to a single dual-action piston. The auxiliary mechanism comprises a piston and an auxiliary mechanism, the auxiliary mechanism comprises a piston bearing, the piston bearing is positioned on the outer side of the piston, the inner side of the piston is connected with a shaft, a gear is arranged on the outer side of the shaft, the gear and the piston are in meshed connection, a piston O-shaped ring is arranged between the piston bearing and the piston, the outer side of the piston bearing is fixedly connected with a spring, and the outer side of the piston is movably connected with a piston guide plate; the single-double action piston has wider application range and is provided with a spring balancing device, and the piston moves along with the pressure difference on two sides of the cylinder. A fixed signal pressure and a variable signal pressure may be input to both sides of the cylinder, or a variable signal pressure may be input to both sides of the cylinder.

Description

Single-double action piston

Technical Field

The utility model relates to a piston technical field especially relates to a single dual-action piston.

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. Pneumatic actuators are sometimes also equipped with certain auxiliary devices. Commonly used valve positioners and hand wheel mechanisms. The valve positioner is used for improving the performance of the actuator by utilizing a feedback principle, so that the actuator can realize accurate positioning according to a control signal of the controller. The hand wheel mechanism is used for directly operating the control valve to maintain the normal operation of production when the control system has no output or the execution mechanism fails due to power failure or gas cut-off;

the existing piston can only be one of single piston or double piston, the flexibility is low in use, and various requirements cannot be met, so that a single-action and double-action piston is provided.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects of the prior art, the utility model provides a single double-acting piston, which has wider application range and is provided with a spring balancing device, and the piston moves along with the pressure difference between the two sides of the cylinder. A fixed signal pressure and a variable signal pressure may be input to both sides of the cylinder, or a variable signal pressure may be input to both sides of the cylinder.

In order to solve the technical problem, the utility model provides a following technical scheme: the utility model provides a single double-action piston, includes piston and complementary unit, and complementary unit includes piston bearing, piston bearing is located the piston outside, the piston inboard is connected with the axle, the axle outside is provided with the gear, be connected for the meshing between gear and the piston, be provided with piston O type circle in the middle of piston bearing and the piston, piston bearing outside fixedly connected with spring, piston outside swing joint has the piston baffle.

As a preferred technical scheme of the utility model, the spring is provided with four, four around piston bearing side surface the spring is a set of, the spring is provided with two sets ofly, and is two sets of the spring uses piston center point to be the mirror image setting as the axle.

As an optimal technical scheme of the utility model, a side surface that the piston was kept away from to the spring is provided with the end cover, the end cover is provided with the bolt with the junction of spring.

As an optimal technical scheme of the utility model, it is two sets of the spring outside all is provided with the anti-rust paint, the junction setting and the lubricating grease of piston and gear.

Compared with the prior art, the utility model discloses the beneficial effect that can reach is:

the auxiliary mechanism is arranged, so that the application range of the single-action and double-action piston is wider, and the spring balance device is arranged, and the piston moves along with the pressure difference on two sides of the cylinder. A fixed signal pressure and a variable signal pressure may be input to both sides of the cylinder, or a variable signal pressure may be input to both sides of the cylinder.

Drawings

FIG. 1 is a schematic sectional view of the present invention;

wherein: 1. a spring; 2. a piston bearing; 3. a piston O-shaped ring; 4. a piston guide plate; 5. a shaft; 6. a piston.

Detailed Description

In order to make the technical means, the creation features, the achievement purposes and the functions of the invention easy to understand, the invention is further explained below with reference to the specific embodiments, but the following embodiments are only the preferred embodiments of the invention, not all. Based on the embodiments in the implementation, other embodiments obtained by those skilled in the art without any creative work belong to the protection scope of the present invention. The experimental methods in the following examples are conventional methods unless otherwise specified, and materials, reagents and the like used in the following examples are commercially available unless otherwise specified.

The embodiment is as follows:

as shown in fig. 1, a single-double acting piston comprises a piston 6 and an auxiliary mechanism, wherein the auxiliary mechanism comprises a piston bearing 2, the piston bearing 2 is positioned at the outer side of the piston 6, the inner side of the piston 6 is connected with a shaft 5, the outer side of the shaft 5 is provided with a gear, the gear is in meshing connection with the piston 6, a piston O-ring 3 is arranged between the piston bearing 2 and the piston 6, the outer side of the piston bearing 2 is fixedly connected with a spring 1, and the outer side of the piston 6 is movably connected with a piston guide plate 4; four springs 1 are arranged on the surface of one side of the piston bearing 2, the four springs 1 form a group, two groups of springs 1 are arranged, and the two groups of springs 1 are arranged in a mirror image mode by taking the central point of the piston 6 as an axis;

the pneumatic actuator can be divided into a single action and a double action according to the action form, and the double-action actuator is in an air-open air-close type, namely, the air is opened, the air is closed, and when the air source is lost, the pneumatic actuator does not act and stays at the original position. The single-action actuator has a spring resetting function and generally has a normally closed type and a normally open type, namely, the actuator is opened by ventilation and automatically resets to an initial state when an air source is lost. The valve is used more in dangerous working conditions, and can be quickly closed or opened when sudden failure occurs when air supply goods are lost.

The working principle of the double-acting pneumatic actuator is as follows:

when air source pressure enters the middle cavity between the two pistons 6 in the cylinder from the air ports, the two ends of the two pistons 6 in the cylinder move in the direction, air in air cavities at the two ends is discharged through the air ports, and the rack synchronous moving shafts 5 on the two pistons 6 and the gears on the outer sides of the rack synchronous moving shafts 5 rotate in the anticlockwise direction. On the contrary, when air source pressure enters air cavities at two ends of the air cylinder from the air ports, the two pistons 6 move towards the middle direction of the air cylinder, air in the middle air cavity is discharged through the air ports, and meanwhile, the racks on the two pistons 6 are used for synchronizing the clockwise rotation of the shaft 5 and the gear on the outer side of the shaft, and if the pistons 6 are installed in the opposite direction, the shaft 5 is changed into the reverse rotation.

The working principle of the single-action pneumatic actuator is that the pneumatic actuator is provided with a spring:

when air supply pressure gets into the lumen between two pistons 6 of cylinder from the gas port for two pistons 6 separate to move to cylinder both ends direction, force the spring 1 compression at both ends, and the air in both ends air cavity passes through the gas port and discharges, makes two pistons 6 synchronous actuating shaft 5 gears anticlockwise rotation in the machine outside simultaneously. After the air source pressure is changed by the electromagnetic valve, the two pistons 6 of the air cylinder move towards the middle direction under the elastic force of the spring 1, the air of the middle air cavity is discharged from the air port, and meanwhile, if the two pistons 6 enable the synchronous shaft 5 and the gear on the outer side of the synchronous shaft to rotate clockwise, if the pistons 6 are installed in the opposite direction, the shaft 5 rotates reversely when the spring 1 is reset.

The single-double action piston has wider application range and is provided with a spring balancing device, and the piston moves along with the pressure difference on two sides of the cylinder. A fixed signal pressure and a variable signal pressure can be input into both sides of the cylinder, and the variable signal pressure can also be input into both sides of the cylinder;

the maximum operating pressure of the cylinder of the pneumatic piston type actuating mechanism can reach 0.70Mpa. Because of no counteracting action of the spring, the engine has large output thrust, and is particularly suitable for working conditions of high static pressure and high pressure difference. The output characteristics of the mechanism are proportional type and two-bit type. The proportional type is that the signal pressure of signal input is proportional to the stroke of push rod, and the two-position type mechanism with valve positioner is implemented according to the operation force pressure difference between two sides of input piston, and its piston is pushed from high pressure side to low pressure side, so that the push rod can be pushed from one extreme position to another extreme position, i.e. the two-position type actuating mechanism is mainly used for controlling valve opening and closing action.

In other embodiments, as shown in fig. 1, in the embodiment, an end cover is disposed on a side surface of the spring 1 away from the piston 6, and a bolt is disposed at a connection position of the end cover and the spring 1; when the spring 1 needs to be maintained, it can be attached and detached by a more convenient means.

In other embodiments, as shown in fig. 1, the embodiment discloses that the outer sides of two groups of springs 1 are both provided with antirust paint, and the joint of the piston 6 and the gear is provided with lubricating grease; through this design, can effectively promote the life of spring 1, improve the mobility between piston 6 and the gear simultaneously.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited thereto, and various changes can be made without departing from the gist of the present invention within the scope of knowledge possessed by those skilled in the art.

Claims

1. A single-double acting piston comprising a piston (6) and an auxiliary mechanism, characterized in that: the auxiliary mechanism comprises a piston bearing (2), the piston bearing (2) is located on the outer side of a piston (6), the inner side of the piston (6) is connected with a shaft (5), a gear is arranged on the outer side of the shaft (5), the gear and the piston (6) are connected in a meshed mode, a piston O-shaped ring (3) is arranged between the piston bearing (2) and the piston (6), a spring (1) is fixedly connected to the outer side of the piston bearing (2), and a piston guide plate (4) is movably connected to the outer side of the piston (6).

2. A single-double acting piston as claimed in claim 1, wherein: spring (1) is provided with four around piston bearing (2) side surface, four spring (1) is a set of, spring (1) is provided with two sets ofly, two sets of spring (1) uses piston (6) central point to be the mirror image setting as the axle.

3. A single-double acting piston as claimed in claim 1, wherein: an end cover is arranged on the surface of one side, far away from the piston (6), of the spring (1), and a bolt is arranged at the joint of the end cover and the spring (1).

4. A single-double acting piston as claimed in claim 2, wherein: and the outer sides of the two groups of springs (1) are respectively provided with antirust paint, and the joint of the piston (6) and the gear is provided with lubricating grease.