二位四通水压换向阀流场分析及阀芯结构改进

Flow Field Analysis of 4/2 Water Hydraulic Directional Valve and Valve Core Structure Improvement

应用C FD软件FLU EN T对一种新型插装式二位四通水液压换向阀内流场进行了数值模拟,分析了阀内产生压降、能量损失、压力波动、振动及噪声的主要原因,并对阀芯结构进行改进设计。分析结果表明:通过在阀芯前端缓冲头上开设节流槽,去除阀芯前端的退刀槽,锐缘倒角圆角处理和加大阀口开度,可使阀口流速放缓,阀腔内湍流脉动、漩涡流、压力波动等现象减少,常闭插装单元压力损失降低41%,最高湍流动能降低21.1%;常开插装单元压力损失降低了55.6%,最高湍流动能降低了45%.

According to a new type of cartridge 4/2 water hydraulic directional control valve, using CFD methods, using FLUENT software carried out numerical modeling for internal flow field. This thesis analyzes the pressure drop, loss of energy, pressure fluctuation, vibration and noise of the main reasons in internal valve, and then improved the design of valve core structure. The analysis of results show： by means of around the front-end buffer head of valve core opened throttling groove, removed the front-end relief groove of valve core, rounded off the sharp edge, increased the opening of the valve port, valve port flow rate slowed down, the valve chamber turbulence, vortex flow, pressure fluctuations and other phenomena reduced, normally closed cartridge valve pressure loss was reduced by 41%, the maximum turbulent kinetic energy reduced 21.1%; normally open cartridge valve pressure loss decreased 55.6%, the maximum turbulent kinetic energy decreased by 45%.