螺旋槽-波锥坝组合型非接触式机械密封性能分析  

Performance Analysis of Non-contacting Mechanical Seal with a Combined Surface Texture about Spiral and Wavy-Tilt-Dam Groove

作　　者：李志宇[1] 闫方琦 徐鲁帅 宋勇[1] 姚源 LI Zhiyu;YAN Fangqi;XU Lushuai;SONG Yong;YAO Yuan(Xi'an Aerospace Propulsion Institute,Xi'an Shaanxi 710100,China;College of Mechanical Engineering,Xi'an Jiaotong University,Xi'an Shaanxi 710049,China)

机构地区：[1]西安航天动力研究所,陕西西安710100 [2]西安交通大学机械工程学院,陕西西安710049

出　　处：《润滑与密封》2021年第7期87-94,107,共9页Lubrication Engineering

基　　金：国家自然科学基金项目(U1637102,U173720040)。

摘　　要：针对液体润滑非接触式机械密封在低黏环境下承载性能不足的问题,提出一种新型螺旋槽-波锥坝动静压组合型机械密封结构,采用MATLAB软件利用有限差分法求解考虑质量守恒空化边界的雷诺方程,并将组合槽与螺旋槽、波锥坝的密封性能进行比较,进一步分析不同结构参数与工况参数对组合槽性能参数的影响规律。结果表明:新槽型波数与螺旋槽数重合时组合密封在径向出现2个压力峰值,相较于单一槽型结构拥有更好的承载能力与较小的摩擦扭矩;液膜力与泄漏量随波锥比或径向宽度比的增加而增大,外径压力和转速越大,组合槽的承载性能提升越显著,但外径压力的升高会造成较大的径向泄漏。组合槽结合了波锥槽的静压承载与螺旋槽的动压承载综合优势,将有效提升液体润滑非接触式机械密封在低黏环境下的润滑性能。Aimed at the problem that the fluid bearing capacity of liquid lubricated non-contacting mechanical seal is insufficient in low viscosity environment,a new type of spiral groove and wavy-tilt-dam combined mechanical seal structure was proposed,and its sealing performance was compared with that of spiral groove,wavy-tilt-dam respectively.The finite difference method was used to solve the Reynolds equation considering mass-conserving cavitation boundary conditions by using MATLAB software.The influence of different structural parameters and working conditions on the performance parameters of combined mechanical seal was further analyzed.The results show that when the wave number of the new groove coincides with the number of spiral grooves,the combined groove structure has two pressure peaks in the radial direction,which has better load-carrying capacity and smaller friction torque than the single groove structure.The liquid film force and leakage are increased with the increase of wave-cone ratio or radial width ratio,and the larger the external diameter pressure and rotational speed,the higher the load-carrying capacity of the combined groove.The larger radial leakage will be caused by the increase of the external diameter pressure.The combined seal combines the advantages of the static pressure bearing of the wave cone groove and the dynamic pressure bearing of the spiral groove,which will effectively improve the lubrication performance of liquid lubricated non-contacting mechanical seal in the low viscosity environment.

关 键 词：机械密封 螺旋槽 承载能力 表面织构 

分 类 号：TH126[机械工程—机械设计及理论]