某型飞机舱盖关键元件O形密封圈气密性分析  

O-ring Airtightness Analysis of Key Components of a Certain Type of Aircraft Hatch Cover

作　　者：任义志 耿浩壮 权凌霄[2,3] 皮月亮 程瑞 REN Yizhi;GENG Haozhuang;QUAN Lingxiao;PI Yueliang;CHENG Rui(Department of Mechanical and Electrical Engineering,Wuhu Machinery Factory,Wuhu,Anhui 241007;School of Mechanical Engineering,Yanshan University,Qinhuangdao,Hebei 066004;Hebei Provincial Key Laboratory of Heavy Machinery Fluid Power Transmission and Control,Yanshan University,Qinhuangdao,Hebei 066004)

机构地区：[1]国营芜湖机械厂机电部,安徽芜湖241007 [2]燕山大学机械工程学院,河北秦皇岛066004 [3]燕山大学河北省重型机械流体动力传输与控制实验室,河北秦皇岛066004

出　　处：《液压与气动》2024年第8期137-145,共9页Chinese Hydraulics & Pneumatics

摘　　要：对某飞机舱盖作动筒异常弹出进行分析,原因是油液中的气体导致油液体积弹性模量变小,可压缩性增强,易发生弹出现象。基于IFAS模型得到含气量与油液体积弹性模量的关系。座舱盖液压操纵系统密封区域均采用O形密封圈进行密封,但由于关键元件粗糙表面特征的存在构成气体泄漏通道,导致座舱盖液压操纵系统中混入气体。因此提出了一种基于Roth模型的泄漏率计算方法,将O形密封圈与金属粗糙表面之间的接触关系,看作弹性金属光滑表面和刚性金属粗糙表面之间的接触关系,对金属粗糙度表面轮廓三角峰均一化排列,从而将泄漏路径定义为梯形通道。基于有限元软件ABAQUS计算密封圈的密封性能系数,分析了表面粗糙度及偏载情况对气体泄漏率的影响;最后通过ANSYS仿真分析与理论结果进行对比。该工作对高精密的密封结构加工设计有着重要指导意义。The reason for the abnormal ejection of the actuator cylinder of an aircraft hatch cover is that the oil contains gas,which leads to the decrease of the volumetric modulus of elasticity of the oil,the increase of compressibility,and the easy occurrence of the ejection phenomenon,and the relationship between the gas content and the volumetric modulus of elasticity of the oil is obtained based on the IFAS model.The sealing area of the hydraulic maneuvering system of the hatch cover is sealed by O-ring,but the existence of rough surface features of the key components constitutes a gas leakage channel,which leads to the mixing of gas in the hydraulic maneuvering system of the hatch cover.Therefore,this paper proposes a leakage rate calculation method based on the Roth model,in which the contact relationship between the O-ring and the metal rough surface is regarded as the contact relationship between the elastic metal smooth surface and the rigid metal rough surface,and the triangular peaks of the metal roughness surface contour are arranged in a homogeneous manner,so that the leakage path is defined as a trapezoidal channel.Based on the finite element software ABAQUS,the sealing performance coefficient of the seal is calculated,and the effects of surface roughness as well as bias loading condition on the gas leakage rate are analyzed,and finally,the results are compared with the theoretical results by ANSYS simulation analysis.This work has important guiding significance for the design of high-precision seal structure processing.

关 键 词：O形密封圈 表面粗糙度 Roth模型 密封性能系数 气体泄漏率 

分 类 号：TH137[机械工程—机械制造及自动化]