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一、前言在某些深低温装置中,如液氮低温医疗器,其液氮传输软管均采用高真空绝热的不锈钢波纹管。它的缺点是既笨重又不灵活,制造工艺复杂,成本也十分昂贵。液氮双相传输系统,是根据汽膜绝热的原理,采用普通的聚乙烯管传输液氮。它的优点是在传输液氮时,仍能保持接近环境温度时的机械性能,因此它能自由弯曲而不脆裂,操作时灵活轻便,而且成本极低廉,所以深受使用者欢迎。
I. Preface In some cryogenic devices, such as liquid nitrogen cryogenic medical devices, the liquid nitrogen transmission hoses are made of stainless steel bellows with high vacuum insulation. The disadvantage is that it is cumbersome and inflexible, the manufacturing process is complicated, and the cost is also very expensive. Liquid nitrogen biphasic transmission system, is based on the principle of vapor insulation film, the use of ordinary polyethylene pipe liquid nitrogen transmission. Its advantage is that the liquid nitrogen can still maintain mechanical properties near the ambient temperature, so it is free to bend without embrittlement, flexible and lightweight operation, and the cost is very low, so welcomed by users.