比例伺服阀低液动力阀芯导流结构优化设计

本文研究了比例伺服阀的阀芯结构对液动力的影响，提出一种阀芯导流壁面优化设计方案。采用计算流体力学CFD的方法，建立滑动网格模型，分别对阀芯传统导流结构和优化设计后的导流结构进行数值模拟分析，并验证网格无关性。对阀芯所受稳态液动力进行数值求解，并分析不同优化设计方案对阀口处流体流动状态的影响。结果表明，优化设计后的阀腔内部流场分布更均匀，流动状态更平稳；阀芯内流道导流结构会改变阀口处的介质流向，进而改变进出口流体的水平方向上的动量差，补偿部分液动力；与传统方案相比，液动力最大补偿效果可达60%，显著降低了阀芯所受液动力干扰，有利于提升比例伺服阀的静动态控制性能。

Optimized Design of Diversion Structure for Low Hydraulic Valve Core of Proportional Servo Valve

In this paper, the influence of valve core structure of proportional servo valve on hydrodynamic force is studied, and an optimization design scheme of valve core diversion wall is proposed. The sliding mesh model is established by using CFD method of computational fluid dynamics. The numerical simulation analysis is carried out on the traditional diversion structure of valve core and the optimized diversion structure, respectively. The grid independence is verified. The steady-state hydrodynamic force on the valve core is numerically solved, and the influence of the optimized design scheme on the fluid flow state at the valve port is analyzed. The results show that the flow field distribution inside the optimized valve chamber is more uniform. And the flow state is more stable. The flow diversion structure in the valve core will change the flow direction of the medium at the valve port and the momentum difference in the horizontal direction of the inlet and outlet fluid to compensate for part of the hydrodynamic force. Compared with the traditional scheme, the maximum compensation effect of hydrodynamic force can reach 60 %, which significantly reduces the hydrodynamic interference on the valve core and is conducive to improving the static and dynamic control performance of the proportional servo valve.