A bistable electro-hydraulic directional valve

Abstract

The invention relates to a bistable electro-hydraulic reversing valve, comprising a pilot valve one (1), a pilot valve two (2), a throttle port (3), a secondary valve, a three-stage valve, and a one-way valve (6). ), check valve two (7) and accumulator (8), pilot valve one (1), pilot valve two (2) to control the left and right strokes of the secondary valve spool (4) respectively, and then by the two The stage valve spool (4) controls the third stage valve spool (5). When the pilot valve one (1) is electrically actuated, the pressure oil in the accumulator passes through the pilot valve one (1), and then passes through the check valve one (6) to build up pressure in the left end valve chamber of the secondary valve chamber, and the second The stage valve spool (4) is subjected to a force to the right, and then moves to the right. In this way, the pressure is built up in the left end valve cavity of the three-stage valve cavity, the three-stage valve spool (5) is moved to the right, the A3 port is connected to the high-pressure oil, and the B port is connected to the return oil. The large-flow bistable electro-hydraulic reversing valve of the present invention can realize high-speed reversing, has a self-locking function in both open and closed steady-state positions, so that the steady-state position is highly reliable, and has the functions of manual locking and electromagnetic locking at the same time , suitable for use in systems with high reliability requirements, therefore, it has significant military and economic benefits.

Description

technical field [0001] The invention relates to a reversing valve of a hydraulic control system, in particular to a large-flow bistable electro-hydraulic reversing valve. Background technique [0002] Reversing valves are widely used in hydraulic control systems. Generally, they can be divided into seat valve type, slide valve type and rotary valve type according to the structure; they can be divided into manual, motorized, electric, pneumatic, hydraulic and electric according to the operation mode. Hydraulic and other types. Among them, the slide valve is the most widely used. The structure of the slide valve has many advantages, such as relatively simple structure, balanced pressure, small operating force and strong control function. However, the rated flow rate of a general single-stage slide valve is generally below 120L / min. The maximum of the multi-stage spool valve is below 1100L / min, and the reversing time of the multi-stage spool valve will also decrease. And as ...

AI Technical Summary

Problems solved by technology

However, the system using cartridge valves is more complicated, with many components, and the internal pressure control components are likely to cause pressure interference in related circuits, resulting in unreliable commutation and unstable pressure.

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