混流泵叶轮室国产化研制

Domestic preparation of mixed flow pump impeller chamber

叶轮室是汽蚀高发区,一旦发生汽蚀麻点甚至衍变出裂纹,会对水泵性能产生不利影响。混流泵的叶轮室运行时间较长,由于材质原因,修复过程缓慢,不利于泵站正常运行。文章对零件的材质进行优化选型,从力学性能和焊接性能等方面对比,并通过数值仿真对叶轮室进行验证。结果表明,在运行情况下,叶轮室整体的最大等效应力为41.656MPa,最大合位移为0.059698mm;在大修时,最大等效应力为15.557MPa,最大合位移0.016926mm。在2种工况下,零件均满足叶轮室的设计要求。

The impeller chamber is a high cavitation area.Once cavitation pitting occurs or even cracks develop,it will adversely affect the performance of the pump.The impeller chamber of the mixed-flow pump runs for a long time.Due to material reasons,the repair process is slow,which is not conducive to the normal operation of the pump station.In this paper,the material quality of the parts is optimized,the mechanical properties and welding properties are compared,and the impeller chamber is verified by numerical simulation.The results show that under operation,the maximum equivalent stress of the whole impeller chamber is 41.656MPa and the maximum combined displacement is 0.059698mm.During overhaul,the maximum equivalent stress is 15.557MPa and the maximum combined displacement is 0.016926mm.Under both conditions,the parts meet the design requirements of the impeller chamber.