Slide valve structure with function of inhibiting large temperature drift of electro-hydraulic servo valve and adjustment method

Abstract

The invention belongs to the technical field of mechanical engineering, and relates to a slide valve structure with a function of inhibiting large temperature drift of an electro-hydraulic servo valve and an adjustment method. The slide valve structure comprises a force application end cover, a butterfly bimetallic temperature-sensitive sheet, a temperature adjustment gasket, a valve element limiting block, a valve sleeve, a valve element, a shell, a pre-tightening force adjustment gasket, a corrugated sheet and a force bearing end cover. The butterfly bimetallic temperature-sensitive sheet is heated, bent and deformed to extrude the temperature adjustment gasket to push the valve sleeve to move from the force application end cover to the force bearing end cover, and an initial temperature of temperature compensation is controlled by changing the thickness of the temperature adjustment gasket. The valve element limiting block controls the upper limit of flow, and the pre-tightening force adjustment gasket and the corrugated sheet are used for adjusting the pre-tightening force of the valve sleeve. Compared with a traditional slide valve structure of an electro-hydraulic servo valve, the slide valve structure provided by the invention has the advantages of one-way temperature compensation, variable compensation direction, adjustable compensation start temperature point and adjustable pre-tightening force of the valve sleeve, and also has the advantages of simple structure, convenience in operation and high reliability.

Description

Technical field[0001]The present invention belongs to the technical field of mechanical engineering, which relates to a slide valve structure and adjustment method for suppressing the temperature drifting of electro-hydraulic servo valves.Background technique[0002]The electro-hydraulic servo valve is a key element in the servo control system, and the electro-hydraulic servo valve characterp characterized by a jet deflecting plate type has a strong anti-pollution ability, and has a failure to function in the servo control system. .[0003]The general bias jet double-stage electro-hydraulic servo valve is mainly composed of a torque motor level, a deflective jet hydraulic amplifier, and a power slide. The torque motor level is mainly composed of zero components such as magnet, magnet, magnet, coil, armature assembly; the bile jet hydraulic amplifier is mainly composed of jet sheets and ductings, and the defimening plate is processed on the feedback rod of the armature assembly. Inserted...

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Problems solved by technology

[0006]Aiming at the defects of the existing deflector jet type two-stage electro-hydraulic servo valve without temperature compensation, the purpose of this invention is to design a slide valve structure with temperature compensation and The adjustment method is to use the butterfly-shaped bimetallic temperature-sensitive piece to bend and deform when heated to squeeze the temperature-adjusting gasket to push the valve sleeve to move from the direction of the force-applying end cap to the direction of the force-bearing end cap, which can compensate the valve core to the direction of the force-bearing end cap due to temperature changes. The displacement of the movement can reduce or eliminate the zero position output of the servo valve under the condition of temperature change, and reduce the temperature drift of the servo valve; the initial temperature of temperature compensation can be controlled by changing the thickness of the temperature adjustment gasket; the spool limit block acts to limit the spool Motion controls the upper limit of the flow rate, and avoids the pressure of the control chamber on the end face of the spool directly acting on the pre-tightening force adjustment gasket and the temperature adjustment gasket, which increases the stability of the valve sleeve; by adjusting the thickness of the pre-tightening force adjustment gasket, it can Adjust the pre-warning force of the valve sleeve to ensure that the valve sleeve is always in a compressed state to avoid the valve sleeve from moving during the use of the servo valve

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