Hydraulic soft switching transformer capable of realizing pressure rise and fall and working method of hydraulic soft switching transformer

Abstract

The invention relates to a hydraulic soft switching transformer capable of realizing pressure rise and fall. The hydraulic soft switching transformer consists of high-speed switching valves, a one-way valve, a spring energy accumulator, an inertia tube and an inflatable energy accumulator. Rise and fall of load pressure can be realized through a hydraulic loop consisting of the high-speed switching valves, the inflatable energy accumulator and the inertia tube, and the rise and fall magnitude is determined by the duty ratio of the high-speed switching valves for adjustment. A soft switch consisting of the one-way valve and the spring energy accumulator is introduced, so that the pressure difference of a valve port before the high-speed switching valves are opened can be reduced to the maximum extent, and the throttling loss is reduced. Meanwhile, on the basis, the four high-speed switching valves can be softly opened by setting a reverse circulation time sequence, so that higher transformation efficiency is achieved, the requirement of a multi-load actuator is met, and the transmission efficiency of a hydraulic system is improved.

Description

technical field [0001] The invention relates to a hydraulic soft switch transformer for realizing pressure rise and fall and a working method thereof, and belongs to (involves) the field of hydraulic technology. Background technique [0002] The hydraulic transmission system is widely used in heavy vehicles, engineering machinery, aerospace and other fields because of its advantages of large tonnage transmission, easy stepless speed regulation and high compactness of component layout. As the most widely used hydraulic transmission system, the multi-actuator hydraulic system is powered by a single hydraulic pump to drive actuators or loads on multiple hydraulic oil circuits, which can improve the energy efficiency of the hydraulic pump and simplify the layout of system components. As a solution of multi-actuator hydraulic transmission system, the constant pressure network secondary regulation system adapts the pressure / flow required by the load by changing the displacement of...

AI Technical Summary

Problems solved by technology

[0005] (1) The solution of the hydraulic switch transformer is mainly a single step-up hydraulic switch transformer or a step-down hydraulic switch transformer. This type of hydraulic switch transformer cannot meet the load pressure requirements of multiple actuators under different working conditions. There are limitations in the application of the system, and at the same time, there are few solutions for the composite buck-boost transformer with stronger load adaptability

[0006] (2) The use of inertial components is difficult to balance performance, cost, and energy consumption

At present, many schemes use inertial components based on hydraulic motors and flywheels, but their cost is expensive and the mechanism is highly complex, which increases the loss when oil passes through the inertial components and increases the energy consumption of hydraulic switching transformers.

[0007] (3) As the core of the hydraulic switching transformer, the high-speed switching valve will generate a large transient loss during the switching process driven by the high-frequency control signal, which will affect the service life of the high-speed switching valve and reduce the efficiency of the hydraulic switching transformer system

The existing scheme uses the high-speed switching valve as a hard switch, that is, at the moment of opening or closing, due to the delay of the high-speed switching valve, the oil cannot pass through the valve port, resulting in a pressure shock, which directly acts on the high-speed switching valve and other components on, affecting the service life of components

Since the control signals of the hydraulic switching transformer are mostly high-frequency signals, the pressure impacts on the components of the hydraulic switching transformer are more frequent, and the energy consumption of each component also increases, which reduces the efficiency of the hydraulic switching transformer.

Images