High-efficiency and high-accuracy two-way flow assignment method for linear hydraulic pump

Abstract

The invention relates to a high-efficiency and high-accuracy two-way flow assignment method for a linear hydraulic pump. The method is implemented by an electromagnetic linear actuator, a displacementsensor, a hydraulic pump, an active check valve group and a controller, and is characterized in that the electromagnetic linear actuator is adopted to directly drive the hydraulic pump, and the volume of a working cavity of the hydraulic pump is changed; and the controller controls movement of the electromagnetic linear actuator in real time according to electromagnetic linear actuator displacement signals collected by the displacement sensor, meanwhile, the controller controls opening and closing of the active check valve group, a liquid inlet valve in the active check valve group is openedin a volume increasing process of the working cavity, and a liquid outlet valve is opened in a volume reducing process of the working cavity. The output flow direction is changed by changing the liquid inlet valve and the liquid outlet valve in the active check valve group, the efficiency is improved by adjusting opening / closing phase positions of the active check valves, a movement curve of the electromagnetic linear actuator is controlled in real time to inhibit flow fluctuation, and the output flow of the hydraulic pump is accurately controlled by controlling movement amplitude and stroke of the electromagnetic linear actuator.

Description

technical field [0001] The invention relates to the technical field of linear hydraulic pumps, in particular to a flow distribution method of a linear hydraulic pump. Background technique [0002] The plunger pump has the advantages of high rated pressure, compact structure, large driving power, long service life and variable flow, and is widely used in construction machinery, aerospace and other fields. At present, the most commonly used plunger pump is generally the swash plate plunger pump, which has complex structure, many friction pairs, low power density, poor heat dissipation, and insufficient dynamic response performance, which limits the further expansion of its application field. [0003] With the development of linear direct drive technology and sensor technology, linear motors are used to directly drive the plunger pump piston, thereby canceling the mechanical motion conversion mechanism, and electromagnetic direct drive has become an important trend for high-eff...

AI Technical Summary

Problems solved by technology

However, under the reciprocating action of the linear motor in the hydraulic pump driven by the linear motor, the hydraulic cylinder completes the pumping work and realizes the one-way transmission of the fluid. How to realize the two-way fluid transmission of the linear drive hydraulic pump has become a technical difficulty

In addition, passive check valves are widely used in hydraulic pumps and the technology is mature, but the lag of opening and closing affects the further improvement of the working efficiency of hydraulic pumps.

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