摘要
针对非接触式机械密封在启停阶段因工况不稳定发生碰磨引起密封失效的问题,基于密封端面摩擦副微凸体3D分形表征原理,采用Archard黏着磨损理论方法建立了非接触式机械密封在启停阶段的流-固-热-磨耦合模型,计算出摩擦副的磨损率和磨损量并通过试验验证了模型的准确性,分析了非接触式机械密封在启停阶段的操作压力、操作温度、操作转速以及螺旋槽结构参数对摩擦副接触特性、温升特性和摩擦磨损特性的影响规律。结果表明:启停阶段操作转速和操作压力对密封磨损率和磨损量影响显著,操作温度通过密封环的热变形间接影响磨损程度;降低启停阶段的操作压力、操作温度并以大于1500 r·min^(-1)转速启停、以转速增量大于1000 r·min^(-1)调节均有利于减少摩擦副启停过程中的摩擦磨损;综合考虑密封启停阶段和稳定工作阶段的性能得到螺旋槽结构参数的优选取值为:槽坝比0.7~0.8,槽堰比0.4~0.6,螺旋角16°~18°,槽数10~12个,槽深6~8μm。
To address seal failure caused by face contact during start-stop phases of non-contact mechanical seals under unstable operating conditions,a fluid-solid-thermal-wear coupled model was established based on the 3D fractal characterization of micro-asperities and Archards adhesive wear theory.The model calculates wear rate and volume of the seal faces,and its accuracy was validated experimentally.A systematic analysis was conducted on how operating pressure,temperature,rotational speed,and spiral groove structural parameters during the start-stop phase influence the contact characteristics,thermal behavior,and frictional wear of the seal faces.The results show that rotational speed and pressure significantly affect wear,while temperature influences it indirectly via thermal deformation of the seal rings.Lowering the operating pressure and temperature during the start-stop phase,starting and stopping at speeds greater than 1500 r·min^(-1),and adjusting the speed in increments greater than 1000 r·min^(-1) all help reduce friction and wear during the start-stop phase of the friction pair.Considering both start-stop and steady-state performance,the optimal spiral groove parameters are:dam ratio 0.7—0.8,weir ratio 0.4—0.6,spiral angle 16°—18°,10—12 grooves,and groove depth of 6—8μm.
作者
陈凯放
李双喜
毕恩哲
孙宇辉
田举鹏
王磊
CHEN Kaifang;LI Shuangxi;BI Enzhe;SUN Yuhui;TIAN Jupeng;WANG Lei(College of Mechanical and Electrical Engineering,Beijing University of Chemical Technology,Beijing 100029,China;Research Center of Fluid Sealing Technology,Beijing University of Chemical Technology,Beijing 100029,China)
出处
《化工学报》
北大核心
2025年第12期6508-6526,共19页
CIESC Journal
基金
国家重点研发计划项目(2024YFB3410500)。
关键词
机械密封
启停特性
磨损
分形
流体力学
mechanical seal
start-stop characteristics
attrition
fractals
fluid mechanics
