Gap automatic compensating type underwater rotation servo valve

Abstract

The invention discloses a gap automatic compensating type underwater rotation servo valve and belongs to the field of servo valves. The servo valve comprises a lower end cover, a valve body, a valve element, a disc spring, a thrust ball bearing, a pressing cover, an upper end cover and a rotary execution mechanism. Four kinds of oil openings are uniformly distributed in the small end of the lowerend cover. The large end is fixedly connected with the bottom end of the valve body. The valve body and the valve element are in clearance fit. The upper end of the valve body is fixedly connected with the upper end cover. Four kinds of oil openings are uniformly distributed in the thick end of the valve element and correspond to the oil openings in the lower end cover. A ring-shaped groove is formed in the thick end of the valve element and used for installing the disc spring. The thin end of the valve element is in clearance fit with an output shaft of a rotary execution mechanism. The thrust ball bearing and the pressing cover are installed between the disc spring and the upper end cover. The pressing cover makes close contact with the thrust ball bearing. The thrust ball bearing makesclose contact with the disc spring. Pre-pressure is formed between the disc spring and the valve element, thus the valve element is closely combined with the small end of the lower end cover, and themutual gap is compensated. Static sealing is formed between the lower end cover and the valve body, between the valve body and the pressing cover and the between the valve body and the upper end cover, and movable sealing is formed between the valve element and the pressing cover.

Description

technical field [0001] The invention belongs to the field of servo valves, and more specifically relates to an underwater rotary servo valve with automatic gap compensation. Background technique [0002] Commonly used servo valves include nozzle baffle type servo valves, jet tube type servo valves, etc. Both the nozzle baffle servo valve and the jet tube servo valve belong to the pilot servo valve, and their power stages are all slide valve structures. The spool valve has a simple structure, but its anti-pollution ability is relatively poor. When pollution particles enter the gap of the spool valve, it is very easy to cause the stuck phenomenon of the spool (20). The sealing form of the slide valve is a gap fit seal, there will be a certain leakage, and it is difficult to achieve a reliable seal. When seawater is used as the working medium, the suspended sand in the water and the low viscosity of the water itself will make the jamming and leakage more serious. obvious. ...

AI Technical Summary

Problems solved by technology

The structure of the slide valve is simple, but its anti-pollution ability is poor. When the pollution particles enter the gap of the slide valve, it is very easy to cause the stuck phenomenon of the valve core (20)

The sealing form of the slide valve is a gap fit seal, there will be a certain leakage, and it is difficult to achieve a reliable seal. When seawater is used as the working medium, the suspended sand in the water and the low viscosity of the water itself will make the jamming and leakage more serious. obvious

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