偏心圆变量式高压大流量径向柱塞泵的动态流场的有限元分析

Finite Element Analysis of Dynamic Flow Field on Variable Eccentric Radial Piston Pump with High Pressure and Large Flow Rate

偏心圆变量式径向柱塞泵是一种高效节能新型液压泵,已被成功应用于大流量高压液压传动系统中。介绍了11个柱塞偏心圆变量式的一种新型径向柱塞泵(35 MPa、500 m L/r)的工作原理及其机械结构,利用三维建模软件Pro/E,建立该泵的三维立体模型,采用有限元软件Fluent-3D对该泵稳定工作时的内部的速度场和压力场的动态特性进行分析,得到了该柱塞泵稳定工作时的内部的压力场、速度场分布图。依据仿真结果,对泄压槽的结构做了优化改进,改进后的有限元分析结果表明,该泵的压力冲击现象得到明显改善。

Variable eccentric radial piston pump is a new and highly energy efficient one,which has been widely used in the hydraulic transmission system with high pressure and large flow rate. A brief introduction was given on a new variable eccentric radial piston pump＇s mechanical structure and operation theory,which has 11 plungers,at the flow of 500 m L / r and the pressure of 35 MPa.The three-dimensional（ 3-D） models of the pump were built with the aid of the 3-D modeling software Pro / E. The dynamic characteristics of internal flow fields of speed and pressure of the pump were analyzed when operated stably with using of the software of Fluent-3D,by which the charts of pressure of the internal flow field and the speed distribution of the pump were obtained. According as the simulation results,the structure of the pressure relief groove is improved. The analysis of finite element analysis（ FEA） results of the improved show that phenomena of pressure impact of the pump is significantly improved.