Pressure-adjustable and capacity-adjustable hydraulic energy recycling and storing system and working method of hydraulic energy recycling and storing system

Abstract

The invention provides a pressure-adjustable and capacity-adjustable hydraulic energy recycling and storing system. The hydraulic energy recycling and storing system comprises an oil cylinder (1), a variable hydraulic pump (2), a hydraulic switch network, a hydraulic cylinder (6), a hydraulic accumulator (7), a pneumatic accumulator (9), a three-position three-way valve (20) and a two-position three-way valve (21), wherein the variable hydraulic pump (2) communicates with the oil cylinder (1); the output end of the variable hydraulic pump (2) is connected to the hydraulic switch network; the hydraulic switch network communicates with the hydraulic accumulator (7); the hydraulic accumulator (7) is an air inflation type hydraulic tank, and is provided with a hydraulic cavity at the lower part and a compressed air cavity at the upper part; the compressed air cavity of the hydraulic accumulator (7) communicates with the pneumatic accumulator (9) through the three-position three-way valve (20); and the hydraulic cylinder (6) communicates with the hydraulic switch network. An energy recycling unit which is composed of the hydraulic accumulator (7) and the pneumatic accumulator (9) can realize recycling pressure and energy capacity double-parameter adjustment, so that an energy recovery and utilization rate is increased to the greatest extent, and consumption and emission of fuel oil can be greatly reduced while stable operation of system is ensured. The invention further provides a working method of the pressure-adjustable and capacity-adjustable hydraulic energy recycling and storing system.

Description

technical field [0001] The invention relates to a hydraulic energy recovery and storage system with adjustable pressure and capacity and a working method thereof. Background technique [0002] With the continuous increase of oil prices and the increasing impact of exhaust emissions on the environment, energy conservation and emission reduction have become the focus of research. After more than ten years of development, the application of hybrid technology in passenger vehicles has become increasingly mature, and various models emerge in endlessly. Due to the small number of engineering vehicles compared with passenger vehicles, the energy-saving and emission-reduction technology of engineering vehicles has not been paid much attention by various countries. [0003] Engineering vehicles mainly use hydraulically driven actuators to move, and hydraulic cylinders need to be extended and recovered frequently. The hydraulic energy is finally lost in the form of heat energy during...

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Problems solved by technology

[0003] Engineering vehicles mainly use hydraulically driven actuators to move, and hydraulic cylinders need to be extended and recovered frequently. The hydraulic energy is finally lost in the form of heat energy during the conversion process with other energies, which greatly reduces the fuel economy of engineering vehicles.

In response to this problem, some people have proposed a scheme to convert the hydraulic energy of engineering vehicles into electrical energy for recovery, but in the process of recovery and utilization, the hydraulic energy needs to be converted into electrical energy, and then the electrical energy is converted into hydraulic energy. Huge loss in the conversion process of the form, so the fuel economy improvement is not obvious

Others have proposed the use of hydraulic accumulators to recover the hydraulic energy of engineering vehicles. However, due to the complex and changeable operating conditions of engineering vehicles, the hydraulic energy recovery system with fixed capacity and pressure has never been able to fully recover hydraulic energy.

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