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利用温度自紧原理,以氟橡胶作为密封材料、低膨胀合金作为结构支撑,设计一种宽温域、耐多种介质复合密封件。在给定的橡胶压缩率下,通过有限元分析方法计算20 K超低温下该复合密封件的密封比压,结果表明该密封件能够满足新型火箭运载系统的密封要求。通过密封模拟试验,验证该复合密封件在20~500 K范围内,在氢、氧、煤油介质中的泄漏率均小于1×10~(-5)Pa·m~3/s。
Using temperature self-tightening principle, fluororubber as sealing material and low expansion alloy as structural support, a wide temperature field and multi-media composite seal is designed. At a given rubber compression ratio, the seal specific pressure of the composite seal at 20 K was calculated by finite element analysis. The results show that the seal can meet the sealing requirements of the new rocket delivery system. Through the seal simulation test, it is verified that the composite seal has a leak rate of less than 1 × 10 -5 Pa · m -3 / s in the range of 20-500 K and in hydrogen, oxygen and kerosene media.