A multi-redundant shaft distribution servo valve

Abstract

The invention relates to a multi-redundant axial flow distribution servo valve, which comprises an axial flow distribution valve body stator, an axial flow distribution valve sleeve installed by cold assembly, and an axial flow distribution valve core rotatably installed in the axial flow distribution valve sleeve The rotor and the shaft distribution servo valve are divided into three sealing areas that are not connected to each other by multiple sets of sealing rings from top to bottom. The corresponding three sealing areas on the stator side wall of the shaft distribution valve body are respectively provided with i groups of working oil Port A / B, an oil supply port and an oil return port. The shaft distribution spool rotor has multiple oil supply passages and an oil return passage along the axial direction, and the shaft distribution spool rotor corresponds to three sealing areas Grooves and flow passages are respectively arranged in the interior to communicate with the oil supply channel and the oil return channel, and some of the working oil ports are used as the main working oil ports to communicate with the corresponding external actuators, and the rest of the working oil ports are used as redundant. Compared with the prior art, the invention has the advantages of shaft flow distribution, friction reduction, safety redundancy, continuous switching and the like.

Description

technical field [0001] The invention relates to the technical field of fluid control, in particular to a multi-redundant shaft distribution servo valve. Background technique [0002] At present, there are many types of electro-hydraulic servo valves, mainly including double-nozzle baffle electro-hydraulic servo valves, jet servo valves, direct-acting electro-hydraulic servo valves, electric feedback electro-hydraulic servo valves, and moving coil / moving iron / single nozzle electrohydraulic servo valves. hydraulic servo valve. The main characteristics of the nozzle baffle electro-hydraulic servo valve are: simple structure, precise manufacturing, predictable characteristics, no dead zone, no friction pair, high sensitivity, small inertia of the baffle, and high dynamic response; the disadvantage is that the baffle and nozzle Small spacing and poor anti-pollution ability; the main characteristics of the jet servo valve are: large nozzle size, good anti-pollution performance, h...

AI Technical Summary

Problems solved by technology

The main characteristics of the nozzle baffle electro-hydraulic servo valve are: simple structure, precise manufacturing, predictable characteristics, no dead zone, no friction pair, high sensitivity, small inertia of the baffle, and high dynamic response; the disadvantage is that the baffle and nozzle The spacing is small, and the anti-pollution ability is poor; the main characteristics of the jet servo valve are: large nozzle size, good anti-pollution performance, high volumetric efficiency, failure centering, high sensitivity, and high resolution; the disadvantage is that the processing is difficult and the process is complicated

[0003] Electro-hydraulic servo valves and electro-hydraulic proportional valves are the core components of the hydraulic control system. They have high requirements for precision, which brings about the increase of detection and maintenance costs. , filter device, pump source, and the pollution particles produced by the pressure shock in the system cause the valve core of the servo valve to wear, thus causing the performance of the servo valve to deteriorate or even fail to work normally. To solve the wear and tear, the servo valve needs to be replaced as a whole or redundant (standby ) servo valve, but the worn servo valve has use value except for the spool and valve body, resulting in a waste of resources

[0004] In aerospace and military fields, high-reliability multi-redundancy electro-hydraulic servo valves usually use redundant electronic control parts. This multi-redundancy design cannot solve the problem of mechanical wear of the pilot and main valve core. The method of installing multiple servo valves on the same valve block to share oil supply / return oil / working oil passages also needs to consider how to disconnect the worn servo valves to replace the impact of the servo valve on the actuator

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