工程机械电液驱动冷却系统特性研究

Study on Properties of Electro-Hydraulic Driven Cooling System for Engineering Machinery

为了提高重型机械的运行效率、保障其运行安全,设计了电液驱动独立冷却系统,并通过一维和三维仿真得到了该新型结构的运行变化规律,对新型独立热管理系统进行了样机测试,仿真结果表明,在全工况范围内该新型电液驱动冷却系统都具有较好的冷却效果和节能特性,环境温度越低节能优势越明显;新结构内部流场分布均匀,表明结构设计合理。经台架测试表明采用独立冷却系统后,散热能力得到提高,热管理系统能够将系统的热平衡温度控制在91℃左右,控制效果满足实际工作需求。变量液压泵工作在2000r/min以上时整个系统的工作效率在60%左右。

In order to improve the operation efficiency of heavy machinery and ensure its safety,an electro-hydraulic independent cooling system was designed.The operating change law of the new structure was obtained through one-to-three dimensional simulation,and a prototype test of a new independent heat management system was conducted.The simulation results show that the new electro hydraulic driving cooling system has better cooling effect and energy saving characteristics.The lower the ambient temperature,the more obvious the energy saving advantage.The flow field inside the new structure is evenly distributed,which indicates that the structure design is reasonable.The test results show that the heat dissipation ability is improved after the independent cooling system is adopted.The heat management system can control the heat balance temperature of the system at about91℃,and the control effect meets the actual work requirements.When the hydraulic pump works above 2000r/min,the working efficiency of the whole system is about 60%.