中国机械工程2025，Vol.36Issue(5)：933-941,953,10.DOI:10.3969/j.issn.1004-132X.2025.05.005
扩压式自泵送机械密封端面的液膜汽化及其结构优化研究
Research on Liquid Film Vaporization and Structural Optimization of End Faces for Diffuser Self-pumping Mechanical Seals
摘要
Abstract
For the issues of liquid film vaporization in the diffuser self-pumping mechanical seals,a fluid film vaporization calculation model was established based on the Mixture two-phase flow mod-el,viscosity-temperature equation,saturation vapor pressure-temperature relationship.The main re-gions and reasons were investigated for the phase transition of the liquid films between the sealing in-terfaces under medium and high temperature conditions.Through uniform experimentation and the NSGA-Ⅱ algorithm,the optimal sealing face structural parameters were obtained at a temperature of 393 K.The results show that phase transition mainly occurs on the inner diameter side of the sealing faces and the diffuser grooves.As the temperature of the medium increases,the vapor phase volume fraction increases and the viscosity of the medium decreases,the pumping effect weakens,and both the areas of the high and low pressure regions decrease.Under the premise of ensuring the stable operations of the seals,the optimal solution of the ratio of stiffness to leakage is as 257.17 GN·h/(m·L),and the sealing face structural parameters of helix angleβ,sealing dam length wd,spiral groove length wg,spiral groove depth hg and diffuser groove width wk are as 34.4°,5.2 mm,8.9 mm,43.3 μm and 5 mm re-spectively.These research results provide guidance for the optimization of sealing face structure de-sign,control of liquid film phase transition,and enhancement of the sealing performance of the diffus-er self-pumping mechanical seals.关键词
机械密封/汽化/流体动压/密封性能/多目标优化Key words
mechanical seal/vaporization/fluid dynamic pressure/sealing performance/multi-objective optimization引用本文复制引用
饶远,孙见君,闻兰..扩压式自泵送机械密封端面的液膜汽化及其结构优化研究[J].中国机械工程,2025,36(5):933-941,953,10.基金项目
国家自然科学基金(52075268) （52075268）
江苏省重点研发计划(SBE2021030576) （SBE2021030576）
