Dual cooling system suitable for large-displacement electro-hydraulic servo actuator

Abstract

The invention discloses a dual cooling system suitable for a large-displacement electro-hydraulic servo actuator, the double-cooling system is used for the electro-hydraulic servo actuator, the electro-hydraulic servo actuator is connected with an oil inlet and an oil return port, and the oil return port is directly connected with an oil tank of a large-flow pump station through an oil pipe; the cold oil pump is connected with a motor through a coupler, and an oil outlet of the cold oil pump is connected with an oil inlet of the oil cooling pressure limiting valve, the oil temperature and oilpressure integrated sensor and an oil inlet of the evaporator through oil pipes; a refrigerant inlet of the evaporator is connected with an outlet of the dryer and an inlet of the electromagnetic stopvalve, and a refrigerant outlet of the evaporator is connected with a low-pressure port of the pressure limiting valve, a liquid return port of the liquid storage tank and an oil return port of the electro-hydraulic servo actuator. The dual cooling of a working medium and the environment of the electro-hydraulic servo actuator is achieved, the cooling effect of electro-hydraulic servo actuator operation engineering is improved, and noise generated by a cooling system is greatly reduced; and the cooling efficiency is improved, pipeline corrosion is avoided. The system energy consumption is reduced.

Description

technical field [0001] The invention relates to the technical field of large-displacement electro-hydraulic servo actuators, in particular to a double cooling system adapted to large-displacement electro-hydraulic servo actuators. Background technique [0002] Large-displacement electro-hydraulic servo actuators are important equipment for road vibration simulation and fatigue analysis tests of heavy-duty vehicles in the national defense field. The reciprocating high-frequency friction between the piston and the cylinder of the large-displacement electro-hydraulic servo actuator and the repeated high-frequency switching of the working fluid generate heat, which eventually leads to a rise in temperature, causing changes in the working characteristics of the working fluid and micro-deformation of the structure, resulting in electro-hydraulic servo The degree of control distortion increases, the vibration simulation accuracy of the large displacement electro-hydraulic servo act...

AI Technical Summary

Problems solved by technology

This method only starts with dealing with the ambient temperature, and cannot avoid the influence of temperature on the working fluid, which seriously affects the accuracy of electro-hydraulic servo control

In addition, the composition of the heat dissipation cavity of the cylinder body is complex, and the structure occupies a large space

[0006] To sum up, the main problems in the prior art include: the working fluid of the large-displacement electro-hydraulic servo actuator repeatedly switches high-frequency pressure to generate more heat, and the heat generated by the reciprocating high-frequency friction between the piston and the cylinder body is greater. Large and insufficient heat dissipation of the cylinder puts forward higher requirements for the cooling performance of the cooling system of the large-displacement electro-hydraulic servo actuator, such as maintaining the working medium and ambient temperature, improving cooling efficiency, avoiding pipeline corrosion, reducing cooling energy consumption and noise etc.

Existing technologies cannot meet the above requirements

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