Wet-type high pressure resistant torque motor

Abstract

Disclosed is a wet-type high pressure resistant torque motor. Two control coils are opened along the circumference of an armature casing; cylindrical pole shoes of an upper yoke iron core and a lower yoke iron core penetrate through the armature casing to form pole shoe pairs with equal air gaps; one end of an armature push rod is fixedly connected with an armature, and the other end is connected with a main spool of a servo valve; the armature is in a flat long strip shape, left and right wings of the armature are arranged in the air gaps of the pole shoe pairs; plugs and bonded washers are mounted at the left end and the right end of the armature casing respectively; and two circular grooves are opened on root portions of the cylindrical pole shoes of the upper yoke iron core and the lower yoke iron core for mounting O-shaped seal rings. Accordingly, a simple and reliable high pressure resistant structure is formed in an armature cavity, and the armature and the armature push rod are sealed in the armature cavity filled with oil.

Description

technical field [0001] The invention belongs to an electro-mechanical conversion mechanism for an electro-hydraulic servo valve in the field of fluid transmission and control, and in particular relates to a wet high-pressure-resistant torque motor. Background technique [0002] Electro-mechanical converter is an important control element in electro-hydraulic proportional / servo valve, and its performance is related to the overall performance of the servo valve. In the conventional electro-hydraulic servo valves, the nozzle flapper valve and the jet tube valve, a large number of torque motors are used as electro-mechanical converters. Torque motors can be roughly divided into wet type and dry type according to whether they are immersed in oil or not. Dry type torque motors seal the output parts to prevent oil from entering the confined space composed of armature, coil and permanent magnet. However, there are A fatal flaw, that is, the coil wound on the armature will generate ...

AI Technical Summary

Problems solved by technology

Torque motors can be roughly divided into wet type and dry type according to whether they are immersed in oil or not. Dry type torque motors seal the output parts to prevent oil from entering the confined space composed of armature, coil and permanent magnet. However, there are A fatal flaw, that is, the coil wound on the armature will generate a lot of heat after a long period of control current, which will affect the normal operation of the torque motor; and the wet torque motor will allow oil to enter the space around the armature, coil and permanent magnet. , the yoke and armature parts are immersed in the oil, which can be cooled by the oil, and the heat dissipation is better. However, because this structure does not have the ability to withstand high pressure, its control coil is also directly immersed in the oil, which is very easy to be affected by the oil. Liquid corrosion, once the coil is damaged, the entire torque motor will be scrapped

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