Direct-acting electro-hydraulic proportional valve driven by two-way permanent magnet linear force motor

Abstract

The invention discloses a direct-acting electro-hydraulic proportional valve driven by a two-way permanent magnet linear force motor. The valve comprises two end covers, two yokes, a manual reset rod, a reset spring, the two-way permanent magnet linear force motor, centralizing springs, a valve body, a sleeve, a valve housing, a valve element, an adjusting screw, a set screw and the like. One side of the two-way permanent magnet linear force motor is directly connected with the valve element through an armature and a push rod, and the other side of the two-way permanent magnet linear force motor is connected with a manual reset mechanism composed of the left end cover, the manual reset rod, the right end cover and the reset spring. The valve housing is fixed in a cylindrical hole in the valve body, one side of the valve housing is limited through the sleeve by the right yoke in the two-way permanent magnet linear force motor, and the other side of the valve housing is limited by the right end cover. The valve element is supported in the valve housing, one side of the valve element is directly connected with the push rod in the two-way permanent magnet linear force motor, and the other side of the valve element is connected with the centralizing spring B. The direct-acting electro-hydraulic proportional valve has the advantages of being compact in structure, capable of achieving two-way control and proportional control characteristics, rapid in response and the like, and can be widely used in an electro-hydraulic proportion / servo control system.

Description

technical field [0001] The invention relates to an electro-hydraulic proportional valve in a fluid control system, in particular to a direct-acting electro-hydraulic proportional valve driven by a bidirectional permanent magnet linear force motor. Background technique [0002] The direct-acting electro-hydraulic proportional valve uses a high-power driver to directly drive the spool. It has the advantages of strong anti-pollution ability, compact structure, and no pilot stage leakage. It is widely used in electro-hydraulic proportional control systems in national defense and civil industries. . Traditional proportional solenoid valves mainly use proportional electromagnets to drive the spool to generate displacement and thus complete the flow or pressure output proportional to the input voltage. Due to the zero dead zone in the initial stage of the proportional solenoid, the traditional proportional solenoid valve has poor specific force characteristics in small signal cont...

AI Technical Summary

Problems solved by technology

Due to the zero dead zone in the initial stage of the proportional solenoid, the traditional proportional solenoid valve has poor specific force characteristics in small signal control, and two proportional solenoid valves are needed to drive the spool when two-way driving is realized.

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