温度对组合型织构油封密封性能的影响

Influence of Temperature on Sealing Performance of Combined Texture Oil Seals

耦合流体力学、变形分析、接触力学、能量守恒方程和黏温黏压方程,建立具有表面组合型织构油封的密封区域混合润滑数值模型,研究温度对表面组合型织构油封密封性能的影响;通过有限差分法对数值方程离散求解,得到不同表面织构油封唇口的温度分布及不同转速下油封唇口的最高温度,对比分析温升对油封泵吸率、油膜厚度、摩擦扭矩等密封性能的影响。结果表明:油封最高温度位于唇尖处,无织构油封最高温度略高于织构油封,随着转速的增加,油封最高温度也都随之增加;织构的存在会引起油封泵吸率的增加和平均油膜厚度变大;随着温度的升高,油封泵吸率、摩擦扭矩、油膜厚度都会逐渐减小,油封密封性能明显下降,温度升高至一定程度,油封泵吸率会变为负值。

Coupled with fluid dynamics,deformation analysis,contact mechanics,energy conservation equation and viscosity-temperature and viscosity-pressure equations,a numerical model of mixed lubrication in the sealing area of the oil seals with combined surface texture was established,and the influence of temperature on the sealing performance of the oil seals was studied.The numerical equation was solved by finite difference method to obtain the temperature distribution of the lip of oil seals with combined surface texture and its maximum temperature at different speeds,and the effect of temperature rise on the pump suction rate,oil film thickness,friction torque and other sealing properties of the oil seals was compared and analyzed.The results show that the maximum temperature of oil seal is located at the tip of the lip,and the maximum temperature of the non-textured oil seal is slightly higher than that of the textured oil seal.The maximum temperature of the oil seal increases with the increase of speed.The presence of texture will cause an increase in oil seal pumping suction rate and average oil film thickness.With the increase of temperature,the pump suction rate,friction torque and oil film thickness of the oil seal will gradually decrease,and the sealing performance of the oil seal will decrease significantly.When the temperature rises to a certain extent,the oil seal pump suction rate will become negative.