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建立了由机械密封的动环、静环、端面间液膜和密封介质组成的传热系统,研究了液膜摩擦热的传热规律.影响传热规律的主要因素有密封环对介质的给热系数、摩擦热流密度和摩擦热的分配系数等.推导了密封环与液膜的温度分布方程,在考虑液膜黏度随温度变化的基础上,对液膜的摩擦热和密封环的热变形进行了耦合分析,确定了变形端面之间的夹角.研究表明,液膜摩擦热对液膜特性和密封性能的影响显著,其不仅改变了端面间的间隙形式,而且使液膜黏度减小,导致泄漏率增加.传热系统的最高温度位于液膜内径处,绝大部分摩擦热通过动环传递到介质中.依据提出的传热分析方法,可确定密封环的最佳几何尺寸并选择合适的密封环材料.
A heat transfer system consisting of a moving ring, a stationary ring, a liquid film between the end faces and a sealing medium is established, and the heat transfer law of the frictional heat of the liquid film is studied. The main factors that affect the heat transfer rule are the influence of the seal ring on the medium Heat coefficient, friction heat flux, frictional heat distribution coefficient, etc. The temperature distribution equation of seal ring and liquid film is deduced. Based on the change of viscosity of liquid film with temperature, the frictional heat of liquid film and the thermal deformation of seal ring The coupling analysis was carried out to determine the included angle between the deformed end faces.Research shows that the frictional heat of the liquid film has significant influence on the liquid film properties and sealing performance, which not only changes the gap form between the end faces but also reduces the viscosity of the liquid film , Resulting in increased leakage rate.The maximum temperature of the heat transfer system is located at the inner diameter of the liquid film, most of the frictional heat transferred to the medium through the moving ring.According to the proposed heat transfer analysis method, the seal ring can determine the best geometry and choose Suitable seal ring material.