屏蔽泵轴向力平衡新方法

New method for axial force balance of canned motor pump

屏蔽泵的轴向力平衡成为影响屏蔽泵使用寿命和效率的关键因素。由于传统平衡方法难以完全解决屏蔽泵轴向力平衡问题,因此,采用新的轴向力平衡结构及方法显得十分必要。该文通过对屏蔽泵轴向力的特点分析与计算,采用校核计算的方法设计一个副叶轮,由副叶轮带动冷却液在冷却回路中循环流动,并产生一个与主叶轮产生的轴向力及转子重力等合力大小相等,方向相反的轴向力,从而消除轴向力。通过轴向力平衡计算和试验测量,屏蔽泵残余轴向力较小,满足规定要求,计算结果与试验测量结果基本一致。应用实例表明,屏蔽泵轴向力平衡新方法可靠,计算过程正确,能基本消除残余的轴向力,使轴承的负荷减小,延长轴承使用寿命,实现了屏蔽泵的安全可靠运行,具有一定的工程应用价值。

The magnitude of axial force has great impacts on the life and efficiency of canned motor pump.Because the traditional balance methods can not completely eliminate the axial force of canned motor pump,it is quite necessary to create new technique.Based on the analysis and calculation of axial force of canned motor pump,an auxiliary impeller was designed using the method of examination calculation.The auxiliary impeller drives coolant in the cooling circuit,and generates an axial force which is equal and opposite to axial force by the main impeller and rotor gravity force,thereby the axial force was eliminated.Through the axial force comparisons between theory calculation and experimental measurement,the residual axial force of canned motor pump is small,and the calculation results are basically consistent with experimental measurements.The practical application indicates that the new axial force balance method of canned motor pump is reliable and the calculation is correct.The new method can basically eliminate the residual axial force,reduce the bearing load and extend bearing life,so the canned motor pump can run safely and reliably.These research achievements are also valuable for engineering application.