动压型机械密封气液固流动特性及性能  

Gas-liquid-solid flow characteristics and sealing performance of dynamic pressure mechanical seal

作　　者：陈汇龙[1] 孙冬冬 吴远征 陈妙妙 张培林 赵斌娟[1] CHEN Huilong;SUN Dongdong;WU Yuanzheng;CHEN Miaomiao;ZHANG Peilin;ZHAO Binjuan(School of Engery and Power Engineering,Jiangsu University,Zhenjiang,Jiangsu 212013,China)

机构地区：[1]江苏大学能源与动力工程学院

出　　处：《排灌机械工程学报》2019年第10期882-888,共7页Journal of Drainage and Irrigation Machinery Engineering

基　　金：国家自然科学基金资助项目(51279067)

摘　　要：为了探索动压型机械密封微间隙气液固流动特性及密封性能,建立了间隙润滑膜气液固多相流模型,对间隙流动进行数值模拟,分析槽型参数和工况参数对流动特性及密封性能的影响.研究表明:槽宽比、螺旋角和转速的增大以及槽深的减小均会使润滑膜空化区域增大;随着槽宽比、槽径比和槽深的增大,润滑膜开启力先增大后减小,最佳槽型参数值分别是槽宽比0.3~0.6、槽径比0.7~0.8、槽深6~10μm(转速高、槽深取大值),较小的螺旋角能获得较大开启力;在所研究参数内密封主要为负泄漏,转速、槽径比的增大和螺旋角的减小均会使泄漏量绝对值增大,而槽深、槽宽比的增大使泄漏量绝对值先增大后减小;总体上固体颗粒主要聚集在槽堰区及坝区内侧,槽径比减小和螺旋角增大会使固体颗粒向槽堰区聚集,易造成螺旋槽堵塞失效.In order to explore the gas-liquid-solid flow characteristics and sealing performance on micro-gap of dynamic pressure mechanical seal,a gas-liquid-solid multiphase flow model of gap lubrication film was established to simulate the gap flow to analyze the effects of channel parameters and operating parameters on the flow characteristics and sealing performance.Results show that the increase of groove width ratio,helix angle and speed,and the decrease of groove depth will increase the cavitation area of the lubrication film.With the increase of groove width ratio,groove diameter ratio and groove depth,the opening force of the lubricating film increases first and then decreases.The optimum groove type parameters are groove width ratio 0.3~0.6,groove diameter ratio 0.7~0.8,and groove depth 6~10μm(high rotational speed and high depth).Smaller helix angle can get greater opening force.In the studied parameters,the seal is mainly negative leakage,while the increase of the rotatio-nal speed,the ratio of the groove diameter and the decrease of the helix angle will increase the absolute value of the leakage,while the increase of the groove depth and the groove width ratio will first increase and then decrease the absolute value of the leakage.In general,the solid particles are mainly concentrated in the tank area and the inner side of the dam area.The decrease of the ratio of the groove diameter and the increase of the helix angle will cause the solid particles to aggregate in the trough area,which easily makes the the spiral groove to be blocked and then lose efficacy.

关 键 词：机械密封 槽形参数 液膜 气液固流动 性能 

分 类 号：TH117.2[机械工程—机械设计及理论] S277.9[农业科学—农业水土工程]