Abstract:Taking mechanical seal of deepsea thruster as the research object,a mechanical seal ring model was established.Considering the difference of the friction coefficients of contact end faces under variable working conditions,the thermalmechanical coupling deformation of the end faces of mechanical seal dynamic and static rings were analyzed by the separation method.The analysis results considering thermal deformation,force deformation and thermalmechanical coupling deformation of sealing ring were compared.The results show that the frictional coefficient of contact end faces is related to the medium pressure,rotational speed,liquid film thickness and other factors.The frictional coefficient of contact end faces is decreased with the increase of the medium pressure,increased with the increase of the rotational speed,and decreased with the increase of the liquid film thickness.The results of single force deformation analysis,thermal deformation analysis and thermomechanical coupling deformation analysis are quite different.The results of thermomechanical coupling analysis are more accurate than those of single deformation analysis.Under transient working conditions,the peak contact pressure and temperature of the end face show a change trend from outside to inside,and the contact state of the end face is obviously affected by the temperature distribution of the end face.