Multiphysics Coupling Model and Control Performance Analysis of Controllable Mechanical Seal with Piezoelectric Ceramics
A controllable mechanical seal structure based on piezoelectric ceramics was proposed.Based on the finite el-ement software,the effect of the applied voltage and the piezoelectric ceramic number on the stator end face deformation was analyzed.Taking the thermo-mechanical coupling effect between the seal rings and the lubricating film into considera-tion,a multiphysics coupling model of the controllable mechanical seal was developed.The influence of the applied voltage and the piezoelectric ceramic number on the sealing performance was investigated.The results show that the piezoelectric ceramics applied with voltage produce the deformation of radial taper and circumferential waviness on the stator end face,and the deformation increases with the increasing voltage.The deformation of the stator end face improves the load-carrying capacity of the lubricating film and reduce the contact force.With the increase of piezoelectric ceramic number,the circum-ferential waviness deformation reduces,the radial taper deformation increases,and the end face deformation tends to be uni-form in circumferential direction.Increasing the voltage of piezoelectric ceramics can achieve a transition in the lubrication state of the sealing rings,so as to reduce the frictional temperature rise of the sealing end face,and control the leakage rate within the allowable range.
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