氟塑料磁力泵流场模拟及轴承端面磨损分析

Flow Field Simulation of Fluoroplastic Magnetic Drive Pump and Wear Analysis of Bearing End Face

目的 研究氟塑料磁力泵中干摩擦轴承端面异常磨损现象,揭示泵内介质流动特性。方法 基于SIMPLEC压力-速度耦合算法和SST k-ω湍流模型,应用FLUENT软件,进行氟塑料磁力泵全流场数值模拟研究;通过数值计算得出氟塑料磁力泵全流场轴截面、叶轮截面和轴承间隙流道介质流速和压力的分布规律。结果 叶轮压水室流道内压力分布合理,总体压力随着流量的增大而减小;但因进口管道流入的介质同平衡孔回流介质发生碰撞,叶轮流道内介质流动紊乱;同时,干摩擦轴承进出口过大的压力差是造成干摩擦轴承异常磨损的主要原因。结论 研究成果可为氟塑料磁力泵性能优化及解决干摩擦轴承端面异常磨损问题提供理论依据。

The overflow part of the fluoroplastic magnetic pump is completely lined with fluorine.the cooling circulating medium flows back to the impeller through the bearing clearance and the balanced hole.In order to study the abnormal wear phenomenon of the dry friction bearing of the fluoroplastic magnetic pump and reveal the flow characteristics of the medium in the pump, based on the SIMPLEC pressure-velocity coupling algorithm and the SST k-ω turbulence model, the FLUENT software was used to conduct a numerical simulation study of the full flow field of the fluoroplastic magnetic pump.The results show that the pressure distribution in the flow channel of the impeller and volute is reasonable, and the overall pressure decreases with the increase of the flow;but because the medium flowing in the inlet pipe collides with the return medium of the balance hole, the flow of the medium in the impeller flow channel is turbulent.The excessive pressure difference between the inlet and outlet of the friction bearing is the main reason for the abnormal wear of the dry friction bearing.