An underwater rotary servo valve with automatic clearance compensation

Abstract

The invention discloses an automatic gap compensation type underwater rotary servo valve, which belongs to the field of servo valves. Including: lower end cover, valve body, valve core, disc spring, thrust ball bearing, gland, upper end cover and rotary actuator; four oil ports are evenly distributed on the small end of the lower end cover, and the large end is fixedly connected with the bottom end of the valve body; The gap between the valve body and the valve core is matched, and the upper end of the valve body is fixedly connected with the upper end cover; four oil ports are evenly distributed on the thick end of the valve core, corresponding to the oil ports on the lower end cover; there is a ring groove on the thick end of the valve core for installation Disc spring; the fine end of the spool fits with the output shaft of the rotary actuator; a thrust ball bearing and a gland are installed between the disc spring and the upper end cover; the gland is in close contact with the thrust ball bearing, and the thrust ball bearing is in close contact with the disc spring, and the disc spring A pre-pressure is formed between the valve core, so that the valve core and the small end of the lower end cover are tightly combined to compensate for the gap between the two; between the lower end cover and the valve body, between the valve body and the gland, and between the valve body and the upper end cover. Static sealing, dynamic sealing is formed between the valve core and the gland.

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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