抽水蓄能机组推力轴承静力学特性分析

Analysis of the Statics Characteristics of the Thrust Bearing of the Pumped-storage Unit

本文针对抽水蓄能电站在调相启动过程中出现的高压注油泵出口压力降低情况,研究油膜对推力轴承的作用机理。分别建立1/12推力瓦和推力头模型,基于流固耦合理论,对推力轴承进行静力学分析。结果表明:推力轴承润滑油进口压力和油膜表面最大压力呈线性增长趋势;随着进口压力的减小,推力瓦表面应力和应变随之减小,推力瓦表面产生的最大形变不足推力瓦外径尺寸的0.1%,对机组运行造成的影响较小;进口压力为4MPa和11MPa对应推力头的最大应力相差近60%,考虑对推力头应力集中处进行表面强化或改善其结构,同时进口压力应控制在一定范围,降低推力头形变对油膜均匀分布的影响。研究结论对抽水蓄能机组安全可靠运行提供了理论参考。

In this paper,the outlet pressure of the high-pressure oil injection pump during the phase modulation start-up process of the pumped-storage power station is studied,and the mechanism of the oil film on the thrust bearing is studied.The 1/12 thrust pad and thrust head models are established respectively,and the statics analysis of the thrust bearing is carried out based on the theory of fluid-solid coupling.The results show that the thrust bearing lubricating oil inlet pressure and the maximum pressure on the surface of the oil film show a linear growth trend;as the inlet pressure decreases,the surface stress and strain of the thrust pad decreases,and the maximum deformation on the surface of the thrust pad is less than the outer diameter of the thrust pad.0.1%of the size has little impact on the operation of the unit;4MPa and 11MPa correspond to the maximum stress difference of nearly 60%of the thrust head.Consider strengthening the surface of the thrust head stress concentration or improving its structure.At the same time,the inlet pressure should be controlled at a certain level.Range,reduce the influence of thrust head deformation on the uniform distribution of oil film.The research conclusions provide a theoretical reference for the safe and reliable operation of pumped storage units.