Energy-saving control loop of hydraulic system

Abstract

The present invention relates to water cooled engine driving hydraulic pump directly and aims at lowering power consumption. The control loop consists of over ten parts, including return oil filter, engine, hydraulic pump, hand cock, etc. as well as pipeline. During idle running of the engine, the valve block assembly feeds the hydraulic oil from the hydraulic pump back to the oil tank through the heat sink and the return oil filter, producing little energy loss. When the equipment is run, the hand cock is first opened, and the pressure the return oil filter produces is utilizes to drive the valve block assembly to commutate, so that pressurized oil from the hydraulic pump fills the whole high pressure pipeline for the equipment to run normally. After the temperature of the hydraulic oil and the engine cooling fluid is raised to certain value, the temperature controlled valve is opened automatically, the ventilating channel to the engine tank and the heat sink is opened and the fan is rotated, so as to cool the hydraulic oil and the engine cooling fluid.

Description

technical field [0001] The invention relates to a hydraulic circuit of construction machinery, which realizes energy saving and consumption reduction to the greatest extent according to the working condition requirements of operating equipment. Since the circuit contains specially set reversing valves, temperature control valves, valve block assemblies and their connecting pipelines, even if the hydraulic pump is integrated with the engine, the engine can still start and run with zero load (very small load in non-construction state) , up to a negligible level). Background technique [0002] Due to the characteristics of small size, light weight, easy layout, convenient pipeline connection and simple maintenance of hydraulic components, hydraulic transmission technology has been widely used in various mechanical equipment at present. Whether it contains hydraulic open loops, closed loops, or quantitative systems and variable systems, modern mec...

AI Technical Summary

Problems solved by technology

[0003] Most of the hydraulic circuits mentioned above adopt the structure in which the hydraulic pump is directly connected to the engine. As long as the engine is running, the energy consumption of the hydraulic pump cannot be avoided (regardless of whether the mechanical equipment is working or not). The displacement and the system limit the maximum pressure to operate. When the system safety valve is opened, the hydraulic oil is directly discharged into the oil tank, resulting in a great waste of energy.

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