高压自紧式聚酰亚胺垫片密封性能影响因素分析及结构优化  

Analysis of factors affecting the sealing performance of high-pressure self-tightening polyimide gasket and structural optimization

作　　者：郑娆[1] 刘丽静 李双喜[1] 刘登宇 ZHENG Rao;LIU Lijing;LI Shuangxi;LIU Dengyu(School of Mechatronic Engineering,Beijing University of Chemical Technology,100029 Beijing,China)

机构地区：[1]北京化工大学机电工程学院,北京100029

出　　处：《流体机械》2024年第6期76-82,98,共8页Fluid Machinery

基　　金：国家重点研发计划项目(2018YFB2000800)。

摘　　要：为了解决液体火箭发动机在异常工况下的密封失效问题,建立了发动机充气阀阀芯密封结构的有限元模型,分析了密封结构参数、加工误差及卡滞偏斜对充气阀阀芯密封性能的影响,并进行了试验验证。结果表明:综合考虑可加工性、密封效果,圆阀座是充气阀的首选结构;在不同圆角半径下,圆角半径在0.35~0.45 mm范围内使用效果最佳;平面度偏差及卡滞偏斜在0~0.07 mm范围内对密封效果和使用寿命几乎没有影响。本研究可为航天军工用高精密密封的设计和优化提供参考,有助于提高我国高精密密封的技术水平。To address sealing issues in liquid rocket engines during abnormal conditions,a finite element model for the sealing structure of the engine’s inflation valve core was established,and the effects of various factors such as sealing structure parameters,machining errors,and sticking deflection on the valve’s sealing performance were analyzed.And experimental validation was also conducted.The results show that a circular valve seat is the first choice structure of the inflation valve considering both processability and sealing effect.Under different fillet radii,the optimal performance is achieved when the fillet radius is in the range of 0.35~0.45 mm.Flatness deviation and sticking deflection within the range of 0 to 0.07 mm have negligible effects on sealing performance and service life.This research methodology can provide a reference for designing and optimizing high-precision seals for Chinese aerospace and military industry and helps to improve the technological level of Chinese high precision seals.

关 键 词：聚酰亚胺 自紧密封 优化设计 高压 高精密密封 

分 类 号：TH136[机械工程—机械制造及自动化] V432[航空宇航科学与技术—航空宇航推进理论与工程]