新型旋转式换向阀的内部流场分析

Internal Flow Field Analysis of a New Rotary Reversing Valve

为解决传统伺服阀结构复杂、工作上限频率较低及价格高昂等问题,提出了一种带有中间轴的双阀芯双自由度的旋转式四通换向阀。应用计算流体动力学方法(CFD)对所设计的旋转式换向阀内部流场进行了分析,研究了转阀在不同旋转角度时,静、动态情况下内部压力与速度的分布情况,比较了静态以及动态的分析结果。研究结果表明,转阀内部压力损失主要集中于左阀芯与中间轴轴向流道的接触部分,随着旋转角度增大,接触部分的压力损失逐渐减小,低压区域也随之减少,同时接触部分的速度变化趋于平缓,转阀内平均速度随之增大。

In order to address the problems of the traditional servo valve like the complex structure, the expensive cost, and the low upper frequency, a new rotary high speed four-way reversing valve with dual-spool and two degrees of freedom is designed. The flow characteristics of this valve are studied by Computational Fluid Dynamics. In addition, based on the rotation angle, the characteristics of the pressure and velocity distribution under static and dynamic condition is analyzed, and the analysis results under static condition is compared to the results under dynamic condition. The research results prove that the pressure loss of the rotary valve are concentrated in the contact parts between axial channel of the left spool and axial channel of the intermediate shaft. Meanwhile, as the angle increases, the pressure loss of the contact parts and the low pressure regions are reduced gradually. What is more, as the angle increases, the velocity of the contact parts is changed slightly and the average velocity is increased.