动压机械密封副结构与性能分析

本文以300MW核主泵双向推力轴承油密封副为研究对象,通过数值模拟分析、连续运转试验等方法,研究了各密封性能参数的相互影响以及密封面结构与密封性能的内在关系。通过对机械密封动、静环的受力变形分析,研究了密封端面变形与性能参数之间的联系。在考虑空化和不考虑空化两种情况下,分别对密封面进行了流场分析。阐述了影响泄漏量关键参数的取值方式。通过计算分析和连续运行试验验证,证明了该密封副结构变形小,应力分布合理,得出了泄漏量和开启力与密封副压差、动环端面流体浅槽深度的关系,密封泄漏量满足设备运行要求。

Hydrodynamic Study on Structures and Properties of Hybrid Pressure in Conjunction with Wave-mechanical Seal

In this paper use 300MW nuclear main pump bi-directional thrust bearing oil seal as the object of the study, through numerical simulation analysis, continuous operation test and other methods to study the mutual impacts of all sealing performance parameters and the intrinsic relationship between the seal surface structure and sealing performance. Through stress deformation analysis of the mechanical seal move ring and static ring to study the connection between the deformation of the seal end face and the performance parameters. The flow field analysis of the seal face was carried out with and without the consideration of cavitation respectively. This paper describes the value selection of key parameters affecting the leakage. Through calculative analysis and continuous operation test, it is proven that the deformation of the sealing pair structure is little and the stress distribution is reasonable. The pressure difference of the leakage and opening force with the pressure of the sealing pair were obtained, as well as the relationships with the depth of the moving (dynamic) ring end face shallow flow passage. The leakage of the seal met the operation requirement of the equipment.