机械密封端面摩擦热与热变形的耦合分析

Coupling Analysis of Frictional Heat of Fluid Film and Thermal Deformation of Mechanical Seal End Faces

建立了机械密封环的传热模型,确定了动环和静环传递的摩擦热占总热量的比值。借助有限元方法和人工神经网络,研究了密封环端面间液膜摩擦热与端面热变形的耦合过程,确定了动环转速ω、密封面内径处的膜厚hi和变形后的密封环端面的径向夹角β之间的关系。根据闭合力与液膜承载力的平衡条件得到了与给定ω对应的hi和β。分析了泄漏率与闭合力之间的关系,探讨了用闭合力控制泄漏率的原理。

The heat transfer model of the rotating ring and the stationary ring of mechanical seal was built. The method to calculate the frictional heat that transferred by the rings was given. The coupling analysis of the frictional heat of fluid film and thermal deformation of end faces was carried out by using FEA and BP ANN, and the relationship among the rotational speed ω, the fluid film thickness hi on the inner diameter of sealing face and the radial separation angle β of deformed end faces was obtained. Corresponding to a given ω, hi and β can be obtained by the equilibrium condition between the closing force and the bearing force of fluid film. The relationship between the leakage rate and the closing force was analyzed, and the fundamental of controlling the leakage rate by regulating the closing force was also discussed.