波度动压机械密封的性能分析与优化选型  

Performance analysis and optimized model selection of wavy hydrodynamic mechanical seals

作　　者：苏文涛 胡世宏 王磊 冯晓东 SU Wentao;HU Shihong;WANG Lei;FENG Xiaodong(College of Petroleum Engineering,Liaoning Petrochemical University,Fushun 113001,China;Harbin Electric Power Equipment Company Limited,Harbin 150066,China;School of Energy Science and Engineering,Harbin Institute of Technology,Harbin 150001,China)

机构地区：[1]辽宁石油化工大学石油天然气工程学院,辽宁抚顺113001 [2]哈尔滨电气动力装备有限公司,黑龙江哈尔滨150066 [3]哈尔滨工业大学能源科学与工程学院,黑龙江哈尔滨150001

出　　处：《中国石油大学学报(自然科学版)》2023年第6期138-145,共8页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：国家自然科学基金面上项目(51976043)。

摘　　要：基于质量守恒的空化边界条件建立波形密封端面润滑液膜的理论模型,采用有限元法求解润滑液膜的Reynolds控制方程,获得不同工况参数和几何参数下的密封性能变化规律,并与试验结果进行对比。结果表明:压力和转速增大均会导致泄漏率和液膜刚度增大,动压效应增强,有利于密封运行稳定,但是低压下液膜易发生空化;温度对最小液膜厚度没有影响,对动压效应略有影响,且随着温度升高,动压效应在减弱;波数和波幅增大均会导致最小液膜厚度和泄漏率增大;波数越多,液膜刚度越大,静压效应越强;波幅越大,液膜刚度越小,动压效应越弱;综合考虑泄漏率和密封运行稳定性,波形端面的波数为9,波幅为6.3μm较为合理,更适合于核主泵轴密封运行。Based on the cavitation boundary condition of mass conservation,the theoretical model of the lubricating liquid film on the wavy seal end face was established.The Reynolds̍equation of lubricating liquid film was solved using the finite element method,and the laws of sealing performance under different conditions and geometric parameters were obtained,which were compared with the experimental results.The results show that by increasing the pressure and the rotation speed,the leakage rate and liquid film stiffness will be both increased,and the hydrodynamic effect will be enhanced.This charac-teristic will improve the stable operation of the seal,but the low pressure may prone the liquid film to cavitation.Meanwhile,the temperature has no effect on the minimum thickness of the liquid film,but has a slight effect on the hydrodynamic effect,while the hydrodynamic effect decreases with the increase of temperature.The increase of wave number and amplitude will both increase the minimum liquid film thickness and the leakage rate.This effect will also increase the liquid film stiffness and the hydrostatic effect.In addition,the increase of wave amplitude will reduce the liquid film stiffness and the hydrody-namic effect conversely.By comprehensively considering the leakage rate and stability of seal operation,the wave number of the wavy end face is 9 and the wave amplitude is 6.3μm,which are more reasonable and more suitable for the operation of the shaft seal for reactor coolant pump.

关 键 词：核主泵 机械密封 波形端面 液膜空化 有限元法 

分 类 号：TM623[电气工程—电力系统及自动化]