低压工况O形圈动/静密封特性数值模拟与实验研究  

Experimental and Numerical Simulation Study on Sealing Characteristics of O-rings Under Low-pressure Working Conditions

作　　者：陈铭亮 梁晟林 戴庆文[1] 黄巍[1] 王晓雷[1] CHEN Mingliang;LIANG Shenglin;DAI Qingwen;HUANG Wei;WANG Xiaolei(College of Mechanical and Electrical Engineering,Nanjing University of Aeronautics&Astronautics,Nanjing Jiangsu 210016,China)

机构地区：[1]南京航空航天大学机电学院,江苏南京210016

出　　处：《润滑与密封》2025年第4期112-117,共6页Lubrication Engineering

基　　金：航空科学基金项目(ASFC-2020Z040052002)。

摘　　要：作动筒是飞机起落架系统的重要组成部件,为起落架、舱门的放下和收上提供动力源。作动筒采用的O形圈通常工作在高速、高压、高温、高寒、振动、冲击等恶劣工况下,常常出现渗漏,影响系统的正常运行。为降低O形圈密封失效的影响,以丁腈橡胶O形圈为例,利用有限元方法分析O形圈在低压状态下的密封特性,探究压缩率、油液压力等对O形圈动/静密封效果的影响及其作用机制;同时搭建低压密封性能测试实验台进行验证。结果表明:在动/静密封工况下,随着油液压力的增加,高压缩率的O形圈表现出更好的密封性能;在动密封状态下,O形圈存在扭转现象,这进一步提升了O形圈的密封性能。The actuator tube is an important component of the aircraft landing gear system,which provides power source for the landing gear,hatch lowering and retracting.The O-ring used in the actuator usually works under high-speed,highpressure,high temperature,high cold,vibration,impact and other harsh conditions,and leakage often occurs,affecting the normal operation of the system.In order to reduce the impact caused by the sealing failure of O-ring,taking nitrile rubber O-ring as an example,the sealing characteristics of O-ring under low pressure were analyzed by finite element method,and the effects of compression ratio and oil pressure on the dynamic/static sealing effect of O-ring and its mechanism were explored.A low-pressure sealing performance test bench was built for verification.It is found that under the dynamic/static sealing condition,with the increase of oil pressure,the O-ring with high compression ratio presents superior sealing performance.There exists rolling torsion behaviour of O-rings under the dynamic sealing condition,which further enhances the sealing performance of O-rings.

关 键 词：丁腈橡胶 O形圈 高/低压工况 动/静密封 压缩率 

分 类 号：TB42[一般工业技术] V226[航空宇航科学与技术—飞行器设计]