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液氦是获得从绝对另度起10度以内低温的唯一致冷剂,大家都知道物体在这样的低温下具有超导性、超流动性等特殊性能。目前研究低温不只具有科学意义,而且具有极大的实际意义,因为低温已在无綫电技术、计算机、电子学及许多其他具体工作中运用。氦液化器的需要量增加了,研究液氦已成为若干研究部门的科研项目。因此,设计出一种运转安全、简易及有效的氦液化循环是技术物理中的一项重要任务。
Liquid helium is the only cryogenic refrigerant that achieves temperatures within 10 degrees Celsius from an absolute temperature. As we all know, objects have special properties such as superconductivity and super-fluidity at such low temperatures. The current study of low temperatures is not only of scientific interest, but also of great practical significance as cryogenic temperatures have been used in radio technology, computers, electronics and many other specific tasks. The need for helium liquefiers has increased, and research on liquid helium has become a research project for several research departments. Therefore, designing a safe, easy and effective helium liquefaction cycle is an important task in technical physics.