压电陶瓷可控机械密封多场耦合模型与调控性能分析

Multiphysics Coupling Model and Control Performance Analysis of Controllable Mechanical Seal with Piezoelectric Ceramics

提出一种基于压电陶瓷的可控机械密封结构,基于有限元软件分析施加电压和压电陶瓷数量对密封静环端面的变形规律;考虑密封动静环与润滑液膜间的热力耦合作用,建立可控机械密封的流固热耦合模型,研究施加电压和压电陶瓷数量对密封调控性能的影响。结果表明:施加电压的压电陶瓷使静环端面产生了径向锥度和周向波度变形,变形量随电压的增大而增加;静环端面变形在增大液膜承载力的同时减小了端面接触力;压电陶瓷数量的增多减小了周向波度变形,增大了径向锥度变形,使静环端面变形趋于周向均匀化;增大压电陶瓷电压可实现密封端面润滑状态的转变,使密封端面摩擦温升降低,使泄漏率控制在允许范围之内。

A controllable mechanical seal structure based on piezoelectric ceramics was proposed.Based on the finite element 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 consideration,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 circumferential waviness deformation reduces,the radial taper deformation increases,and the end face deformation tends to be uniform 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.