转换活门密封对航空发动机数控系统通道切换的影响分析及改进  

Analysis and Improvement of Sealing Structure of Transfer Valve on FADECs Channel Switching

作　　者：胡文豪 杨晨 HU Wen-hao;YANG Chen(AECC Aero Engine Control System Institute,Wuxi,Jiangsu 214063)

机构地区：[1]中国航发控制系统研究所,江苏无锡214063

出　　处：《液压与气动》2021年第5期177-182,共6页Chinese Hydraulics & Pneumatics

摘　　要：为改进液压机械装置(HMU)中主、备控制通道间的切换性能,避免航空发动机数控系统出现通道切换异常,采用试验及AMESim仿真结合的方法分析转换活门摩擦力对通道切换性能的影响,结果表明,摩擦力越大转换活门运动越慢,据此根据数控系统的设计需求反推转换活门处摩擦力的要求。采用ANSYS仿真获取转换活门动密封中聚四氟乙烯保护圈尺寸与摩擦力的对应关系曲线,根据反推的摩擦力的要求结合产品实际设计允差,对转换活门处聚四氟乙烯保护圈进行改进设计,最终通过试验验证改进后的转换活门密封可使数控系统通道正常切换且不影响密封效果,为后续同类设计提供实用的参考。In order to improve the performance of channel switching in a certain type of hydro mechanical unit(HMU)and avoid channel switching failed in the full authority digital engine control system(FADECs),the influence of friction on the channel switching performance are studied by mean of experiment and AMESIM simulation analysis,the results show that the larger the friction force,the slower the transfer valve movement.According to the design requirements of the FADECs,the friction requirements at the transfer valve are deduced.Then ANSYS is used to obtain the relationship between the size of polytetrafluoroethylene protection ring and friction force in the dynamic seal of transfer valve.Considering the requirements of friction force obtained before,combined with the actual design tolerance of the product,the design of protection ring at the transfer valve is improved.Finally,the experimental verification shows that the improved transfer valve seal can make the FADECs channel switch normally,at the same time,it does not affect the sealing effect of the transfer valve,and it provides an effective reference for the follow-up similar design.

关 键 词：转换活门 通道切换 摩擦力 密封 设计改进 

分 类 号：TH137[机械工程—机械制造及自动化] V233[航空宇航科学与技术—航空宇航推进理论与工程]