水下航行器艉轴球面机械密封热-结构耦合分析

Thermal-structure Coupling Analysis of and Spherical Mechanical Seal of Stern Shaft in Underwater Vehicle

针对船舶轴系校中不良、轴承磨损等因素会导致艉轴平面机械密封面出现垂向偏移,严重影响密封面的接触压力、温度和变形等密封性能的问题,应用有限元方法建立水下航行器艉轴球面机械密封热-结构耦合模型,在不同的潜深和轴转速条件下,分析轴线垂向偏移对球面机械密封的接触压力、温度和变形状况的影响规律,结果表明,在轴线有垂向偏移的情况下,密封球面的接触压力、温度和变形与无偏移相比变化很小,说明球面机械密封具有良好的自位能力,能在不同工况条件下保持较稳定的密封性能。

The poor shafting-alignment, beating wear and so on factors in vessels can lead to the plane mechanical seal face of a stern shaft to arouse vertical excursion which can seriously affect the sealing performance such as the contact pressure, temperature and deformation of sealing surface. In order to solve this problem, the research on a spherical mechanical seal is carried out. The finite element method is used to establish the thermal-structure coupling model of the spherical mechanical seal of stern shaft in an underwater vehicle. Under the different depth water and the shaft rotary speed, the influence of the axis vertical excursion on the contact pressure, temperature and deformation of spherical mechanical seal is researched to provide theoretical support for the design and engineering application of spherical mechanical seals. The research results show that under axis vertical excursion, the contact pressure, temperature and deformation of spherical sealing surface are much lower than ones of no vertical excursion respectively, which indicates that spherical mechanical seal is of a good ability of self-aligning and can remain the relative stability of sealing performance under different working conditions