基于Newmark-β法的非接触式机械密封轴向振动研究

Research on Axial Vibration of Non-contact Mechanical SealsBased on Newmark-β Method

振动对非接触式机械密封性能有着重要影响,如导致碰撞和泄漏。构建包括静环-液膜-动环-弹性元件的密封系统模型,探讨自由衰减振动、自激振动和地震极端振动3种激励下,密封系统静环、动环和弹性元件的位移以及密封系统泄漏和碰撞的情况。研究表明:在不受外界激励的情况下,在自由衰减振动下密封系统轴向稳定性和密封性能良好;密封系统在受到简谐振动激振力形式的自激振动干扰后,系统位移量明显增大,会显著影响密封性能;叠加一定地震烈度的随机平稳地震动影响下,弹性元件位移量大幅增加,密封失效。振动对非接触式机械密封性能的影响显著,应确保密封端面间液膜厚度稳定且足够小,以维持密封系统的长周期运转。

Vibration has an important impact on the performance of non-contact mechanical seals,such as collision and leakage.A seal vibration system model was built,which included static ring,liquid film,dynamic ring and elastic element,and the displacement of the static ring,dynamic ring,and elastic components of the sealing system,as well as the leakage and collision of the sealing system under three types of excitations,such a free attenuation vibration,self-excited vibration,and seismic extreme vibration,were explored.The results show that the axial stability and sealing performance of the sealing system are good under free attenuation vibration without external excitation.After being disturbed by self-excited vibration in the form of harmonic vibration excitation force,the displacement of the sealing system significantly increases,which will significantly affect the sealing performance.Under the influence of random and stable ground motion with a certain seismic intensity,the displacement of elastic components increases significantly,leading to seal failure.Vibration has a significant impact on the performance of non-contact mechanical seals.It is necessary to ensure that the liquid film thickness between the sealing faces is stable and small enough to maintain the long-term operation of the sealing system.