An anti-erosion power stage spool valve in a hydraulic servo valve

Abstract

An anti-erosion power stage spool valve in a hydraulic servo valve, a high-pressure oil port filter (26) is installed at the inlet of the oil port P (28); Flow groove (32), diversion platform (31) is opened on the valve sleeve (2); the valve port (23) composed of oil port A (24) and oil port T (19) is near the valve port (23) The spool (1) is provided with a guide groove (21), and the valve sleeve (2) is provided with a guide platform (22); the valve port (17) formed by the oil port B (14) and the oil port T (19) ), there is a guide groove (18) on the valve core (1) near the valve port (17), and a guide platform (16) on the valve sleeve (2); oil port P (28) and oil port B The valve port (11) formed by (14) has a diversion groove (12) on the valve core (1) near the valve port (11), and a diversion platform (13) is provided on the valve sleeve (2).

Description

technical field [0001] The invention relates to the field of hydraulic slide valves, in particular to an anti-erosion power stage slide valve in hydraulic servo valves. Background technique [0002] As the core component of the hydraulic servo system, the electro-hydraulic servo valve controls the output pressure of the pre-stage and the orifice area of ​​the slide valve through a weak electric signal, and then precisely controls the pressure, flow and direction of the liquid flow. It is used in aerospace, ships, especially It is widely used in national defense special equipment and other fields. For example, in the electro-hydraulic servo mechanism of missiles, the electro-hydraulic servo valve controls the displacement of the piston rod, adjusts the swing angle of the load nozzle, and then controls the flight attitude of the missile. [0003] As the spool valve of the hydraulic amplifier in the hydraulic servo valve, it is also the power stage of the servo valve. The servo...

AI Technical Summary

Problems solved by technology

[0007] (1) There are many studies on the erosion mechanism and performance degradation law of servo valves in the existing literature, and there are few anti-erosion designs;

[0008] (2) It is difficult to realize the local wear resistance enhancement process of the valve port. The oil purification only stays at the system level, or a filter is installed at the high-pressure oil port of the pre-stage to reduce the clogging and erosion of the pre-stage. For servo valves The protection effect of the power stage slide valve is limited;

[0009] (3) The separate valve port design can indirectly improve the erosion resistance of the servo valve to a certain extent, but it needs to be replaced regularly, and the erosion resistance of the servo valve itself is insufficient

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