Shell protective structure of electro-hydraulic servo valve

Abstract

The invention relates to a shell protective structure of an electro-hydraulic servo valve. The shell protective structure comprises a valve body and a shielded wire. The shielded wire enters a valve body side surface wire penetrating hole, upwards penetrates out of a valve body upper surface wire outlet, and is welded to a motor coil outgoing line. The valve body upper surface wire outlet is filled with sealant for sealing. The valve body side surface wire penetrating hole is filled with polyurethane sealant, and a cover plate is fixedly connected through a fastener. An upper cover is installed at the upper end of the valve body through a fastener, and polysulfide rubber is fully smeared in the position between the upper end of the valve body and the bottom of the upper cover, and the whole shell protective structure of the electro-hydraulic servo valve is formed after high-temperature aging treatment. According to the shell protective structure, a product plug and socket structure is changed into a shielded wire structure, filling and sealing treatment is conducted through a seal ring and the polyurethane sealant, the seal requirement is met, wet, hot, salt mist, mould and other atrocious weather environments are isolated, and performance and quality of the servo valve are improved.

Description

technical field [0001] The invention relates to an electro-hydraulic servo in hydraulic engineering, in particular to a shell protection structure of an electro-hydraulic servo valve. Background technique [0002] The principle of electro-hydraulic servo valve is as follows: figure 1 As shown, it is mainly composed of torque motor, hydraulic amplifier, slide valve assembly and feedback assembly. The torque motor adopts a permanent magnet structure, the spring tube supports the jet tube 11 assembly of the armature 10, and isolates the motor from the hydraulic part, and the pre-stage is a hydraulic amplifier. Its working principle is: when the motor coil 12 inputs the control current, the control flux generated on the armature 10 interacts with the permanent magnet flux, so a torque is generated on the armature 10, causing the armature 10 to deflect a small angle proportional to the torque. Through the jet action of the nozzle 13, the pressure at one end of the spool 14 incr...

AI Technical Summary

Problems solved by technology

[0006] Due to the harsh working environment of the servo valve, it has been working in the environment of humidity, mold and salt spray for a long time. These environmental factors can cause short circuit of the torque motor of the servo valve, corrosion of the coil and enameled wire, and disturbance of the motor magnetic field, etc., which will affect the performance of the servo valve. and the quality of the

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