中低速下干气密封型槽仿生改进研究  

Bionic Improvement of a Spiral-Grooved Dry Gas Seal at Mid-and-Low Speed

作　　者：彭旭东[1] 张风云[1] 白少先[1] 李纪云[1] 

机构地区：[1]浙江工业大学过程装备及其再制造教育部工程研究中心,浙江杭州310032

出　　处：《摩擦学学报》2014年第1期43-50,共8页Tribology

基　　金：国家自然科学基金项目(51175740;51275473);浙江省自然科学基金杰出青年基金项目(R1090833);教育部博士点基金项目(20103317110002)资助~~

摘　　要：为解决干式气体端面密封在中低速或启动停车阶段密封性能不稳定的问题,在现有螺旋槽端面型槽结构的基础上借鉴仿生学设计方法提出了仿生多流通道螺旋槽干气密封端面结构.基于气体润滑理论模型,采用数值分析方法计算了气体端面气膜压力控制方程-雷诺方程,研究对比了普通螺旋槽和多流通道槽的端面压力分布.在改变操作参数和端面气膜厚度的条件下分析对比了普通螺旋槽和多流通道槽两种干气密封的开启力,泄漏率,刚度和刚漏比的变化规律,并研究了槽的通道数对密封性能的影响规律.结果表明:中低速下多流通道细长螺旋槽具有高的稳定性和好的密封性,汇流槽在增加密封稳定性的同时可降低泄漏率.In order to solve the problem of poor stability in the dry gas seal at mid - and - low speed or start - stop phase, a new type of dry gas seal with multi - path spiral groove was presented based on design of common spiral groove and bionic. Reynolds equation was resolved by using numerical analysis method. A comparison study on gas film pressure distribution of a dry gas seal with bionic multi -path spiral grooves and common spiral grooves was carried out. Analysis and comparison on opening force, leakage rate, stiffness and ratio to leakage of a dry gas seal with bionic multi - path spiral grooves and common spiral grooves was studied under different pressure and film thickness. The influence of number of channels on sealing performance was made. The results show that a dry gas seal with bionic multi - path spiral grooves had lower leakage and better stability at mid -and -low speed. The grooves with annular can improve seal stability and reduce leakage rate.

关 键 词：干气密封 型槽 密封性能 仿生设计 

分 类 号：TH117.2[机械工程—机械设计及理论]