An overflow loss recovery system based on hydraulic motor and its control method

Abstract

The invention provides an overflow loss recovery system based on a hydraulic motor, comprising an oil tank, a main pump, a first check valve, a first reversing valve, a first relief valve and a hydraulic cylinder, the first relief valve It has a first valve oil outlet and a pilot oil outlet, the first valve oil outlet is connected with a second reversing valve, and the second reversing valve has a second oil outlet and a second oil inlet, wherein One of the second oil outlets is connected with a hydraulic motor, and the hydraulic motor is driven and connected with a generator. The invention also provides a hydraulic motor-based overflow loss recovery control method. Through the organic combination of the reversing valve, relief valve, check valve, hydraulic motor and generator, etc., the energy recovery of the overflow loss of the relief valve port is realized, and the outlet loss of the relief valve is recovered by using the hydraulic motor and the generator. The hydraulic energy is converted into electric energy to realize energy recovery. Since the generator can be actively controlled, it can solve the pressure difference loss at the valve port to achieve high-efficiency energy recovery.

Description

technical field [0001] The invention relates to an energy-saving control system and a control method thereof, in particular to an overflow loss recovery system based on a hydraulic motor and a control method thereof. Background technique [0002] The outlet of the proportional relief valve (conventional) is generally connected to the fuel tank, and the relief valve works, and the pressure loss of the valve port is the inlet pressure of the relief valve. The flow varies with the type of hydraulic system. With the trend of high pressure of the hydraulic system, the problem of overflow loss will be more serious. The overflow loss of the overflow valve is related to the type of hydraulic system, the actual working conditions in the working process and the operation mode of the operator. According to the function of the overflow valve, the overflow loss is mainly divided into the pressure regulation overflow loss and the safety overflow loss. In the throttle-in speed regulation...

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Problems solved by technology

[0003] The Chinese invention patent with the publication number CN106122188B discloses a conventional overflow valve overflow loss recovery and reuse system based on hydraulic accumulators, which is a system designed by the applicant in the early stage, which uses hydraulic accumulators as energy storage Although the element can solve the overflow loss problem of the overflow element itself under certain conditions, since the pressure of the accumulator cannot be actively controlled, in the proportional overflow valve whose target pressure will be dynamically adjusted, the pressure difference at the overflow valve port It cannot be set according to the minimum pressure difference, and there is still a certain pressure loss at the valve port, which makes it difficult to achieve efficient energy recovery

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