叶片式摆动液压缸门形密封结构的设计及性能分析

摘要

针对叶片式摆动液压缸的泄漏问题,设计一种门型密封结构,该结构具有“自密封”优点,能够根据工作压力的变化调节密封压力,对密封面进行自适应密封.基于有限元分析方法,在ANSYS中建立门形密封结构的接触模型,研究预压缩量、工作压力对接触面压力和油膜厚度的影响.结果表明:当门形密封结构的预压缩量在0～2 mm,工作压力在0～3 MPa范围内时,密封面的接触应力分别同预压缩量和工作压力呈线性关系,反映自密封功能非常理想;同时密封面油膜分布呈楔形分布,具有良好的承载能力和润滑性,减少了密封面的摩擦力,提高了叶片式摆动液压缸缸的运动效率和稳定性.%A sealing structure was designed to reduce the leakage of the hydraulic swing vane cylinder.The door-shaped sealing structure has the advantage of self-sealing,which can adjust sealing pressure according to work pressure to complete the adaptive sealing of the sealing face.Based on finite element analysis method,the contact model of the door-shaped sealing structure was established in ANSYS,and the effects of pre-compression magnitude and work pressure on the contact pressure and oil film thickness of the sealing face were studied.The results show that when the pre-compression magnitude of the door-shaped sealing structure ranges from 0 to 2 mm,the work pressure ranges from 0 to 3 MPa,the contact pressure of sealing surface is linear with pre-compression magnitude and work pressure,which reflects the ideal self-sealing of sealing surface.The oil film of the sealing surface is in wedge-shaped distribution,and better carrying capacity and lubricity is realized in the sealing surface,which decreases the frictional force and improves the movement efficiency and stability of the hydraulic swing vane cylinder.