A two-way speed regulating valve based on active control of variable pressure difference

Abstract

The invention provides a two-way speed regulating valve based on the active control of the variable pressure difference, adding a hydraulic motor-generator energy recovery unit as a pressure compensator for the throttle valve port in the two-way speed regulating valve. The inlet and outlet pressure difference Δp1 (Δp1=p1‑p2) of the throttle valve is obtained through the sensor, and the current valve port pressure difference is compared with the target control pressure difference to obtain the motor control signal. When Δp1 is greater than the target control pressure difference, the motor controller adjusts The torque of the generator increases, thereby increasing the pressure difference between the inlet and outlet of the hydraulic motor Δp2 (Δp2=pp‑p1), that is, reducing the outlet pressure p1 of the hydraulic motor. At this time, the pressure at both ends of the two-way speed regulating valve throttle valve The difference Δp1 decreases and stabilizes around the target pressure difference. When Δp1 is less than the target control pressure difference, the motor controller adjusts the torque of the generator to decrease, thereby reducing the pressure difference between the inlet and outlet of the hydraulic motor Δp2 (Δp2=pp‑p1), which increases the outlet pressure p1 of the hydraulic motor, thus , the pressure difference Δp1 across the throttle port of the flow valve becomes larger and stabilizes near the target pressure difference.

Description

Technical field [0001] The present invention relates to electro-hydraulic control techniques and two-way plug-in valves, and more particularly to a two-way speed-controlled valve based on transformer difference. Background technique [0002] Hydraulic transmission is widely used in the advantages of power density and easy to realize linear motion, but its maximum shortage is that the efficiency is low. Taking the valve control hydraulic excavator as an example, according to the research report, the energy utilization of the hydraulic excavator is approximately 20%, of which the hydraulic system is about 30%, so the energy saving technology of hydraulic systems is critical. [0003] There are many types of hydraulic systems, but the energy consumption of different hydraulic systems is basically reflected in throttle loss and overflow loss. Among them, the throttling loss is mainly divided into imported throttling loss, export throttle loss, bypass festival flow loss, and linkage l...

AI Technical Summary

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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