枞树型槽上游泵送机械密封稳态特性数值分析  

Numerical Analysis on Steady Characteristics of Upstream Pumping Mechanical Seals with Fir-Tree Grooves

作　　者：孙鑫晖[1] 闫方琦 李振涛 郝木明[1] 张伟 SUN Xinhui;YAN Fangqi;LI Zhentao;HAO Muming;ZHANG Wei(Institute of Sealing Technique,China University of Petroleum,Qingdao Shandong 266555,China;New Intelligence Energy Systems Control Co.,Ltd.,Beijing 102600,China)

机构地区：[1]中国石油大学(华东)化学工程学院,山东青岛266555 [2]新智能源系统控制有限责任公司,北京102600

出　　处：《润滑与密封》2018年第12期76-80,共5页Lubrication Engineering

摘　　要：针对电机轴承密封可靠性差的问题,提出一种适用于电机的枞树型槽上游泵送机械密封。在MATLAB环境下求解液膜稳态雷诺方程,得到枞树型槽上游泵送机械密封端面液膜压力分布,分析端面结构参数如槽深比、螺旋角、槽坝比对密封稳态特性的影响规律,并给出枞树型槽结构参数的设计优选范围。结果表明:该机械密封具有较好的动压效应;随着槽深比的增加,开启力、泵送量和液膜刚度均先增大后迅速减小,摩擦因数则缓慢增大;随着螺旋角的增大,开启力和泵送量逐渐减小,刚度先增大后减小;随着槽坝比的增大,开启力和泵送量增加,摩擦因数增大,刚度先逐渐增大而趋于稳定;槽深比和螺旋角对枞树型槽上游泵送机械密封的稳态特性影响较大,而槽坝比的影响较小;取槽深比1. 0～4. 0、螺旋角15°～25°、槽坝比1. 5～2. 5时,机械密封可获得较大开启力和液膜刚度、较小摩擦因数等较好的综合性能。Aimed at the poor reliability of motor bearing seal,a type of upstream pumping mechanical seals with bi-direction fir-tree grooves for electromechanical transmission high speed motor was presented.The steady-state Reynolds equation was solved by means of the finite element method and MATLAB programming,and the pressure distribution of the fluid between the seal faces of the upstream pumping mechanical seals with fir-tree grooves was obtained.The influence of the geometrical parameters such as groove depth ratio(the ratio of groove depth to film thickness),spiral angle and the ratio of groove and dam on the steady characteristics was analyzed.The results indicate that the upstream pumping mechanical seal has good dynamic pressure effect.With the increasing of groove depth ratio,the opening force,pumping capacity and liquid film stiffness are increased first and then decreased rapidly,while the friction coefficient is increased slowly.With the increasing of groove-dam ratio,the opening force and pumping capacity,the friction coefficient are increased,and the stiffness is increased gradually and tends to be stable.The groove depth ratio and spiral angle have a greater influence on the steady-state characteristics of the mechanical seal than the groove-dam ratio.When the groove depth ratio is between 1.0 and 4.0,spiral angle is between 15°and 25°,the groove-dam ratio is between 1.5 and 2.5,the mechanical seal has good comprehensive performance.

关 键 词：枞树型槽 上游泵送 稳态特性 

分 类 号：TB42[一般工业技术] TH136[机械工程—机械制造及自动化]