Two-way speed control valve based on variable pressure difference active control

Abstract

The invention provides a novel two-way speed control valve based on variable pressure difference active control. A hydraulic motor-generator energy recycling unit is added for serving as a pressure compensator of a throttling valve port in the three-way speed control valve, through a sensor, the inlet and outlet pressure difference delta p1(delta p1 is equal to p1-p2) of a throttling valve is obtained, a current valve port pressure difference and a target control pressure difference are compared, a motor control signal is obtained, when the delta p1 is larger than the target control pressure difference, a motor controller adjusts torque of a generator to be increased, therefore, inlet and outlet pressure difference delta p2(delta p2 is equal to pp-p1) of a hydraulic motor is increased, that is, the outlet pressure p1 of the hydraulic motor is reduced, at the moment, the pressure difference delta p1 of the two ends of the throttling valve port of the two-way speed control valve can be reduced and is stabilized nearby the target pressure difference, when delta p1 is smaller than the target control pressure difference, a motor controller adjusts the torque of the generator to be reduced, therefore, the inlet and outlet pressure difference delta p2(delta p2 is equal to pp-p1) of the hydraulic motor is reduced, the outlet pressure p1 of the hydraulic motor rises, and at the moment,the pressure difference delta p1 of the two ends of a throttling valve port of a flow valve can be increased and stabilized nearby the target pressure difference

Description

technical field [0001] The invention relates to an electro-hydraulic control technology and a two-way cartridge valve, in particular to a two-way speed regulating valve based on variable pressure differential active control. Background technique [0002] Hydraulic transmission is widely used in various industrial fields due to its advantages of high power density and easy linear motion, but its biggest shortcoming is low efficiency. Taking the valve-controlled hydraulic excavator as an example, according to the research report, the energy utilization rate of the hydraulic excavator is only about 20%, and the efficiency of the hydraulic system is about 30%, so the research on energy-saving technology of the hydraulic system is very important. [0003] There are many types of hydraulic systems, but the energy consumption of different hydraulic systems is basically reflected in throttling loss and overflow loss. Among them, throttling loss is mainly divided into throttling los...

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Problems solved by technology

[0004] In view of this, the present invention aims at the deficiencies in the prior art, and its main purpose is to provide a two-way speed regulating valve based on active control of variable pressure difference, which can realize variable pressure at both ends of the throttle valve port in the two-way speed regulating valve. Active control of differential pressure effectively solves the throttling loss that leads to low efficiency of the hydraulic system, and converts the hydraulic energy traditionally lost at the throttle valve port into electrical energy storage and utilization, improving the efficiency of the hydraulic system

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