论文部分内容阅读
U型密封圈一般被广泛使用于静密封,即使被密封的法兰严重变形,U型密封圈亦能起到良好的作用,因此它们广泛使用在航空和航天技术中。但是,一般来说,只有被密封的表面很光滑时,U型密封圈才最为有效,而当使用于铸铝等铸件时,铸件表面的粗糙度及多孔性往往会使密封件泄漏。最近美国洛克惠尔国际公司为马歇尔航天飞行中心改进了原有的U型密封圈,其特点是从U型密封圈的末梢延长了一段薄的唇边(见图),该唇边不仅提供了较宽的密封面积,同时亦使末梢处扩大了油压加载区域。所增加的薄的柔性唇边能较容易地吻合凹凸不平的基体,另外,在末梢和唇边上的聚四氟乙烯镀层
U-rings are commonly used for static sealing, and U-rings perform well even with severely deformed flanges, making them widely used in aerospace and aerospace applications. However, U-rings are most effective only when the surfaces to be sealed are smooth, and when used with castings such as cast aluminum, the surface roughness and porosity of the castings tend to leak the seals. Recently, Lockheed Martin International Inc. modified the original U-shaped seal for the Marshall Space Flight Center, which features the extension of a thin lip (see photo) from the tip of the U-shaped seal, which not only provides Wide sealing area, but also to expand the distal tip of the hydraulic loading area. The added thin, flexible lip can more easily conform to the uneven substrate, in addition, the tip and lip polytetrafluoroethylene coating