Control valve capable of achieving two-way variable and open hydraulic pump

Abstract

The invention discloses a control valve capable of achieving a two-way variable and an open hydraulic pump and belongs to the technical field of hydraulic systems. A pump swash plate can achieve the two-way variable by designing a variable control mechanism of an open plunger pump, and the variable control mechanism of the pump can be controlled stably by designing a variable control valve of the pump. A pressure ratio of a large cavity of a variable cylinder of the variable mechanism of the hydraulic pump is changed by logic control of two proportion electromagnetic valves on the variable control valve; the variable cylinder is pushed to extend and contract; and the extension and contraction of the variable cylinder pushes the swash plate to swing to achieve a purpose of positive and negative swing angles of the swash plate. The swing angle of the swash plate or displacement of the variable cylinder in a movement process of the swash plate are fed back to a feedback spring to achieve angle / displacement-force feedback, and a feedback force and electromagnetic forces of the proportion electromagnetic valve achieve force balance to achieve stable control. The two-way variable of the swash plate is effectively achieved, and both a pump function and a motor function can be achieved.

Description

Technical field [0001] The invention relates to a control valve and an open hydraulic pump capable of realizing bidirectional variables, and belongs to the technical field of hydraulic systems. Background technique [0002] At present, the commonly used hydraulic pumps on the market are Rexroth's A10VO / 31 series and A11V series plunger pumps. This series of oil pumps are open plunger pumps. The pump displacement is adjusted by a pair of differential variable cylinders to push the swash plate to swing. The variable control valve controls the pressure of the fluid entering the variable cylinder, pushing the variable cylinder to different positions, corresponding to different swing angles of the swash plate; the cylinder rod of the reset cylinder is connected with the feedback rod, and the feedback rod acts on the control valve core through a spring to realize the variable Controlled displacement-force feedback. [0003] The differential cylinder is composed of a variable cylinder, a...

AI Technical Summary

Problems solved by technology

The stroke limitation of the differential cylinder and the function limitation of the variable control valve make it impossible for this series of pumps to realize the two-way variable displacement of the swash plate.

[0004] Therefore, the existing plunger pumps cannot realize the two-way variable displacement of the swash plate, and can only realize the pump function, not the motor function, and cannot be used in the energy recovery system; Electric proportional control of volume

Images