Energy recovery system of hybrid power engineering machinery energy accumulator-hydraulic motor

Abstract

The invention discloses a hybrid power engineering mechanical accumulator-hydraulic motor energy recovery system. The system mainly comprises an engine, a variable pump, variable frequency motors, a variable motor, a signal control unit, an accumulator and a hydraulic implementation element, and the like. In the system, the variable motor is coaxially connected with a variable frequency motor M2 and forms a composite energy recovery system with the accumulator so as to recover the gravitational potential energy and braking energy in the lowering process of an implementation mechanism. The variable pump, the engine and a variable frequency motor M1 are coaxially connected; a hybrid power system which consists of the engine and the variable frequency motor M1 drives the hydraulic implementation mechanism to rise and lift heavy objects together with the accumulator. The system overcomes the defects that the variable motor-power generator energy recovery system responds slowly and the specific energy of the accumulator is low, enhances the dynamic response performance of the energy recovery system, improves the working conditions of power generation of an electric generator, and simultaneously can directly recover part of potential energy by the accumulator, thus raising the energy recovery efficiency of the system.

Description

technical field [0001] The invention relates to a hydraulic control system characterized by electro-hydraulic control technology, in particular to a hybrid construction machinery accumulator-hydraulic motor energy recovery system. Background technique [0002] In the face of global energy, environmental pollution and other major problems, construction machinery consumes a lot of energy, has high energy consumption, and has poor emissions. It is of great practical significance to study the energy saving of construction machinery. The application of hybrid technology in construction machinery is recognized internationally. One of the best solutions for . The actuators in construction machinery have to repeatedly lift and lower heavy objects, and the mechanical arms of construction machinery have a large inertia. When the mechanical arms are lowered or braked, a large amount of energy will be released. In traditional construction machinery, this part of energy It is difficult ...

AI Technical Summary

Problems solved by technology

However, when the lowering time of the construction machinery actuator is relatively short, taking the excavator arm as an example, the lowering time of the boom is only 2 to 3 seconds. If only the energy recovery system of the hydraulic motor and generator is used, the speed of the mechanical arm will The control is traditional throttling control changed to volumetric speed regulation. It is difficult for the energy recovery system to ensure the rapid decline of construction machinery actuators, thus affecting the operating performance of the system.

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