螺旋槽异型结构参数对密封润滑膜汽化特性及性能的影响  

Influences of special structural parameters of spiral groove on vaporizationcharacteristics and performance of sealing lubrication film

作　　者：陈汇龙[1] 陈英健 付燕霞[1] 卫泽鹏 程谦 史迪超 刘瑞睿 CHEN Huilong;CHEN Yingjian;FU Yanxia;WEI Zepeng;CHENG Qian;SHI Dichao;LIU Ruirui(School of Energy 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,江苏镇江212013

出　　处：《排灌机械工程学报》2023年第11期1148-1155,共8页Journal of Drainage and Irrigation Machinery Engineering

基　　金：国家自然科学基金资助项目(51976078)。

摘　　要：为了了解螺旋槽异型结构参数对密封润滑膜汽化特性及性能的影响,建立了涉及饱和蒸汽压力与温度关系、黏温效应和流体内摩擦效应的密封润滑膜汽化计算模型,对比研究了螺旋槽、Z型槽和雁型槽密封的润滑膜汽化特性和密封性能.研究表明:液膜汽化主要发生在槽堰区及其附近坝区;Z型槽和雁型槽的外槽根周向槽具有储压作用,Z型槽内槽根周向槽有槽区汽化抑制作用.Z型槽密封的开启力明显高于雁型槽和螺旋槽密封,雁型槽密封的开启力略优于螺旋槽密封;Z型槽密封的润滑膜汽化程度最低、泄漏量最小.Z型槽密封开启力在径向偏转系数为0.500~0.625、周向偏转系数为0.375~0.500时取得最大值,但随螺旋角的增大呈近线性下降;润滑膜平均气相体积分数在径向偏转系数为0.625左右、周向偏转系数为0.375、螺旋角为20°左右时获得最小值;泄漏量在径向偏转系数为0.625左右、周向偏转系数为0.500时获得最小值,但随螺旋角的增大呈近线性增大.In order to understand the influence of spiral groove shaped structural parameters on the vaporization characteristics and performance of sealing lubrication film,a sealing lubrication film vaporization calculation model involving the relationship between saturated steam pressure and temperature,viscosity temperature effect and fluid internal friction effect was established.The vaporization characte-ristics and sealing performance of lubrication film for spiral groove,Z-groove and goose groove seals were compared and investigated.The results show that liquid film vaporization mainly occurs in the channel weir area and the nearby dam area.The outer groove root circumferential groove of Z-groove and wild goose groove has the function of pressure storage,while the inner groove root circumferential groove of Z-groove has a cavitation inhibition effect in the groove area.The opening force of Z-groove seal is significantly higher than that of the goose groove seal and spiral groove seal,and the opening force of goose groove seal is slightly better than that of spiral groove seal.The lubrication film of Z-groove seal has the lowest degree of vaporization and smallest leakage.The opening force of the Z-groove seal reaches its maximum value when the radial deflection coefficient is 0.500-0.625 and the circumferential deflection coefficient is 0.375-0.500,but it decreases nearly linearly with the increase of helix angle.The average vapor volume fraction of lubricating film reaches its minimum value when the radial deflection coefficient is about 0.625,the circumferential deflection coefficient is about 0.375 and the helix angle is about 20°.The minimum value of leakage is obtained when the radial deflection coefficient is about 0.625 and the circumferential deflection coefficient is 0.500,but it increases nearly linearly with the increase of helix angle.

关 键 词：螺旋槽异型结构 动压型机械密封 汽化 密封性能 槽型参数 

分 类 号：S277.9[农业科学—农业水土工程]