2D电液比例换向阀阀芯卡紧力分析

Analysis of Spool Cliping Force for 2D Electro-hydraulic Proportional Directional Valve

针对2D电液比例换向阀阀芯卡滞现象,应用缝隙流动原理,对2D阀芯有无偏心情况下的径向卡紧力进行系统理论分析,得到2D阀芯液压卡紧力计算方法;运用MATLAB软件进行数值计算,得出2D阀芯径向卡紧力与偏心量和高低压孔夹角间的关系;根据2D阀特性,提出2D电液比例换向阀阀芯改进措施,应用Fluent软件对阀芯表面的流场进行CFD仿真分析,比较了改进前后的流速矢量和压力分布情况,验证了改进措施的正确性。改进后的2D电液比例换向阀在中高压实验中无"卡滞"现象出现,实现了高压大流量的比例控制。

To solve clamping malfunction of the spool which was caused in the 2D electro-hydraulic proportional valve under high pressure situation,applicating the theory of gap flow,the radial force of 2D valve under eccentric and non-eccentric situations was systematically analyzed and a computational formula of 2D valve clamping force was deduced.Using software MATLAB the analysis result was calculated to get the relationship between 2D valve clamping force and the eccentricity with the angle between the high pressure and low pressure holes.Based on the 2D valve＇s property,the improvement measures of solving spool clamping malfunction were put forward,The flow field of the spool surface was CFD simulated and analysed by using Fluent software.Based on the velocity vector and pressure distribution of the spool,the improvement measure of solving spool clamping malfunction is proved correct.The design philosophy of 2D electro-hydraulic proportional valve is improved,high pressure and large flow proportional control is achieved in improved 2D electro-hydraulic proportional valve.