基于空化模型的阶梯收敛槽机械密封性能分析  

Performance analysis of stepped convergent groove mechanical seal based on cavitation model

作　　者：张伟政[1] 洪海民 ZHANG Wei-zheng;HONG Hai-min(College of Petrochemical Technology,Lanzhou Univ.of Tech.,Lanzhou 730050,China)

机构地区：[1]兰州理工大学石油化工学院,甘肃兰州730050

出　　处：《兰州理工大学学报》2023年第4期68-73,共6页Journal of Lanzhou University of Technology

基　　金：甘肃省自然科学基金(18JR3RA145)。

摘　　要：为解决波度端面机械密封精密加工困难的问题,提出一种由波度密封衍生变化而来的阶梯收敛槽机械密封结构,采用CFD数值模拟,考虑液膜空化效应,对其密封性能进行参数化分析.结果表明:随着槽深、槽数、槽区开口及密封压力的增加,液膜承载力和泄漏量都增大;随着转速的增加,承载力增大,泄漏量减小;随着膜厚的增加,承载力减小,泄漏量增大.在小膜厚,高转速及较低密封压力的工况条件下,更容易产生液膜空化现象,流体泄漏量降低;较小的槽深会增强流体剪切作用,空化效应增强,泄漏量降低,实现减小泄漏的目的.In order to solve the problem of precision machining of the mechanical seal of the wave face,a step-convergent mechanical seal structure derived from the change of the wave degree seal is proposed,and its sealing performance is parametrically analyzed by CFD numerical simulation with consideration of liquid film cavitation effect.The results show that with the increase of trough depth,number of slots,slot opening,and sealing pressure,the bearing capacity and leakage of liquid film increase.With the increase of the speed,the bearing capacity increases and the leakage amount decreases;as the thickness of the film increases,the bearing capacity decreases,and the amount of leakage increases.Under the working conditions of small film thickness,high speed,and low sealing pressure,it is easier to produce liquid film cavitation and reduce fluid leakage.Smaller trough depth will enhance the shear of the fluid,the cavitation effect will be enhanced,and the leakage amount will be reduced,so as to achieve the purpose of reducing leakage.

关 键 词：机械密封 空化效应 密封性能 减小泄漏 

分 类 号：TQ051[化学工程]