随着飞机性能的不断提高,飞机管路系统的连接形式也在日益更新。三十年代初期,飞机上开始使用扩口式导管连接。随着飞机管路系统压力的提高,扩口式导管连接也不断地作了改进。当飞机管路系统压力提高到210kg/cm~2时,这种连接形式已很难适应,即使采取了一些技术上的措施,也经常发生漏油、管扩口挤薄、掉头、裂纹等现象。 With the continuous improvement of aircraft performance, the connection form of aircraft pipeline system is also being updated. In the early 1930s, the aircraft began to use flared catheter connection. As the pressure in the pipeline system increases, the flared conduit connection is continuously being improved. When the pressure of the aircraft pipeline system is increased to 210kg / cm ~ 2, this connection has been very difficult to adapt to, even with some technical measures, often oil spills, pipe flare squeeze, U-turn, cracks and so on .