Bistable Linear Force Solenoid Valve Based on Permanent Magnet Bias

Abstract

The invention discloses a bistable linear force solenoid valve based on permanent magnet bias. Each component is coaxially arranged in a housing formed by the butt joint of an upper end cover and a lower end cover, including a piston rod at a central axis position and a fixed connection with the piston rod. The armature, the peripheral electromagnetic coil, and the magnetic ring clamped between the upper and lower end caps; the armature is constrained to move in the axial direction by setting a counter-pressure spring between the armature and the upper and lower end caps, and the armature moves in the axial direction. Provide restoring force and vibration damping buffer; a closed permanent magnet circuit is formed by the magnetic ring, the upper end cover, the armature and the lower end cover, which provides a permanent magnet bias flux and sufficient magnetic bias for the armature to remain at the upper or lower end when the electromagnetic coil is powered off. The self-retaining force of the linear end portion is obtained; the self-retaining force of the linear end portion based on the permanent magnet bias is overcome by loading the electromagnetic coil with forward and reverse pulse voltage, and the continuous switching of the armature on / off state is realized, and the present invention effectively improves the switching performance. The stability and energy consumption are reduced, the shock vibration and noise radiation of the seat are significantly reduced, and a soft landing is realized.

Description

technical field [0001] The invention relates to the field of solenoid valves, and more specifically relates to a bistable linear force solenoid valve with a closed magnetic circuit and a permanent magnet bias design. Background technique [0002] Solenoid valve is an industrial equipment driven by electromagnetic, which belongs to electromagnetic actuator and is widely used in automation fields such as engine valve control, chassis control, electric window and transmission control system. Conventional solenoid valves are generally composed of electromagnets, armatures, springs, valve cores and valve bodies. The solenoid coil generates a controllable electromagnetic field by receiving the driving voltage provided by the electronic control unit, and magnetizes the armature sleeve assembly in the electromagnetic field to obtain The pulling force or pushing force acting on the armature sleeve is used to overcome the spring pre-tightening force to regulate the movement of the val...

AI Technical Summary

Problems solved by technology

[0003] Existing solenoid valves are mainly mechanisms based on double springs and double electromagnets. Although they have the advantages of simple structure, low cost, easy control, high operating frequency, and quick response, the electromagnetic force provided by this type of solenoid valve will vary with time. The reduction of the gap between the electromagnet and the armature increases significantly and has strong nonlinear characteristics, which makes the solenoid valve produce severe shock vibration when it is seated, causing vibration and noise problems

A large seating impact will not only cause the valve to rebound, affecting the precise control of the fluid medium direction, flow rate, flow velocity and other parameters, but also reduce the service life of the solenoid valve components, which brings difficulties to the effective control of the seating impact

In addition, the holding force required by the solenoid valve to keep the open state or the closed state is usually provided by the continuously energized electromagnet to attract the armature, which causes serious heating problems and significantly increases energy consumption, resulting in insufficient self-holding performance at the end of the solenoid valve. question

[0004] In the prior art, the self-holding of the end of the electromagnetic actuator is mainly realized by mechanical self-holding. However, the mechanical self-holding method increases the moving mass, which is easy to cause the electromagnetic actuator to produce impact when switching between on / off states. Noisy, and can not improve the starting force performance of the actuator

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