高水基电液比例方向阀流场特性分析

Analysis of Flow Field Characteristic of High Water-based Electro-hydraulic Proportional Directional Valve

应用计算流体动力学理论对所设计的高水基电液比例方向阀进行流场特性分析,并进行参数优化。当进液阀套孔直径为1.4 mm时,先导阀进出口压差为2 MPa,液体最大流速产生在阀口处,为73 m/s,压降主要产生在阀口处,此时进液阀套孔直径参数最为合适。随着进液阀套孔锥角变大,先导阀内液体流速最大值减小,阀芯所受冲击减小。当进液阀套孔锥角为70°时,主阀进出口压降为7 MPa左右,压力损失主要产生在阀口处及环形通道内,阀芯两壁面压差较小,作用于阀芯的轴向稳态液动力最大值为300 N。

The computational fluid dynamic theory was applied to analyze the flow field characteristic of the designed high water-based electro-hydraulic proportional directional valve,and the parameter was optimized.When the diameter of the inlet valve sleeve hole is 1.4 mm,the pressure difference between the inlet and outlet of the pilot valve is 2 MPa,the maximum flow rate of the liquid is generated at the valve port,which is 73 m/s,and the pressure drop is mainly generated at the valve port,at this time,the diameter parameter of the inlet valve sleeve hole is the most suitable.As the cone angle of the inlet valve sleeve becomes larger,the maximum liquid flow rate in the pilot valve decreases,and the impact on the spool decreases.When the cone angle of the inlet valve sleeve hole is 70°,the pressure drop of the main valve inlet and outlet is about 7 MPa,the pressure loss is mainly generated at the valve port and the annular channel,the pressure difference between the two walls of the valve core is small,and the maximum axial steady state hydraulic power acting on the valve core is 300 N.