Fan type pneumatic power executor

Abstract

A kind of fan type pneumatic actuator belongs to control valve switch contains external shell, medial axis, rotor and sealing device installing in the external shell body. It has characteristics as that, then rotor is fan type, sealing device is a fixed seal ring which contains rotor seal blade and shell body seal blade. The rotor blade is on the surface of seal ring medial cling to the rotor. The body seal blade is on the inner surface of seal ring lateral cling to shell body. Both sides of rotor seal blade and shell body seal blade setting as '>', '<'type. Both sides of shell body seal blade peripheral setting lug boss. Seal ring fixed on binding surface of two parts of shell. The invention has low energy consumption, simple structure, less components, low cost, is suitable for switch 90 degree of automatic control valve.

Description

technical field [0001] The invention relates to an actuator, in particular to a pneumatic actuator. Background technique [0002] In some automatic control industries, especially in the fields of petrochemicals and food and pharmaceuticals, in order to improve efficiency and realize industrialized automatic production enterprises, pneumatic actuators are used to automatically control valves and other equipment that switch 90 degrees. [0003] Such as figure 1 As shown: the traditional rack-type pneumatic actuator has a cylinder body (10), and a vent hole (12) is provided in the center of the body to communicate with the middle chamber (6) of the cylinder. Two ventilation holes (11, 14) are provided at both ends, communicating with the outer chamber (1). There are two pistons (3,8) in the cylinder body (10), and the pistons (3,8) and the racks (4,9) are integrated. An O-shaped sealing ring (2, 7) is embedded on the outer circumference of the piston, which divides the cylin...

AI Technical Summary

Problems solved by technology

[0004] Its defects are as follows: 1. The transmission adopts rack and gear transmission, so in the transmission process, there must be a transmission hysteresis phenomenon. (13) The wear is serious, and the hysteresis phenomenon will be more obvious, especially when used in proportional control valves, there is no way to achieve accurate control

2. Because the traditional O-ring is used, as the wear of the O-ring increases, the sealing performance will gradually decrease

3. Because it is a mechanical transmission, it increases power consumption and reduces transmission efficiency

4. Because the rack and pinion drive, and the piston and the cylinder need to be sealed, all the matching parts need to be processed, and the manufacturing cost is high

[0006] It has the following defects: 1. The dynamic sealing ring added on the rotor is used to form a sealing structure with the inner chamber of the cylinder. During use, the dynamic sealing ring will inevitably wear out. To achieve a perfect seal of the dynamic sealing ring, there are many parts and it is difficult to manufacture. Costs and repairs are high

2. The inner cavity of the upper and lower cylinders is also used as the sealing surface, which must also be processed very smooth and flat, which greatly increases the manufacturing cost

3. The center shaft is a non-ISO structure, which cannot be directly assembled with the valve, and brackets and connectors must be added

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