主泵轴承上部漏油原因分析研究

Cause Analysis for Oil Leakage on Top of Reactor Coolant Pump

反应堆冷却剂泵(主泵)推力轴承与径向轴承上部在出厂试验期间发生润滑油泄漏。以主泵轴承结构为依据,应用三维建模软件建立轴承上部润滑油泄漏流动区域三维实体模型,使用计算流体力学软件(CFX软件)获得润滑油的泄漏流量和压力分布。数值计算结果表明:漏油成因为甩油环设计不合理,回油孔径太小,浮动密封安装间隙值过大。最后提出设计改进方案并在试验中进行验证。

The lubrication oil leakage occurred on the top of the bearing during the factory test of reactor coolant pump （RCP）. As for this problem, one 3D noumenon model for the fluid area on the top of the bearing is built in this paper to calculate the leakage oil flowrate and get the pressure distribution by the CFD analysis software of CFX. The calculation results indicate that the causes of the oil leakage are the unreasonable flinger design, smaller backflow pipes diameter and bigger floating seal clearance. Finally, we bring up some suggestion to the manufacturer for the design improvement, and then the improvement measures are validated in the pump test.