电液提升器多路换向阀流道压力损失仿真分析

Simulation and Analysis on Pressure Loss of Multi-directional Control Valve of Electro-hydraulic Hitch

大功率拖拉机电液提升器多路换向阀内部流道的几何结构会直接影响流道压力损失大小,较大的压力损失会严重影响整个多路换向阀的液压输出功率,从而制约着拖拉机电液提升器整体的动态性能。为提高加工效率、降低局部压力损失,采用机械加工和铸造相结合的方法设计了一种新的多路换向阀内部流道。在对多路换向阀流道压力损失进行理论分析的基础上,运用ANSYS有限元流场分析模块,对油液在多路换向阀不同流道内的流动状态和压力损失进行了三维数值模拟与分析。仿真结果表明:该多路换向阀的流道压力损失满足设计要求,能够用于大功率拖拉机电液提升器。

The flow channel pressure loss is directly determined by the geometric construction of multi-directional valve in high power tractor electro-hydraulic hitch. Large pressure loss will seriously affect the entire multi-directional valve hydraulic output power,thus the overall dynamic performance of the electro-hydraulic hitch in tractor is restricted. In order to improve machining efficiency and reduce local pressure loss, a new internal flow channel of multi-directional valve was designed by combining machining and casting method.Based on the theoretical analysis of the pressure loss in the flow channel of the multi-directional valve, the three-dimensional numerical simulation and analysis on the flow state and pressure loss of the oil in the different flow channel of the multi-directional valve were carried out by using ANSYS finite element flow field analysis module. The simulation results show that the pressure loss of the multi-directional valve meets the design requirements and can be used in the electro-hydraulic hitch of the high power tractor.