随着液氦冷却设备(如超导磁体、超导传输线、电子储存超导回路等)的发展,需要输送大量液氦或4.2K 的气氦,以保持上述设备在超导状态下获得超导性能。为了使这些设备充分冷却,主要的问题是将尽量多的液氦从供给源输送到致冷物处。同时应使漏入系统的热量最少。因为液氦的汽化潜热是十分低的 With the development of liquid helium cooling equipment (such as superconducting magnets, superconducting transmission lines, electronic storage superconducting circuits, etc.), a large amount of liquid helium or 4.2K of helium gas needs to be sent in order to keep the above superconducting materials in the superconducting state performance. In order to fully cool these devices, the main problem is to deliver as much liquid helium from the supply to the chiller as possible. At the same time should make the least amount of heat leaked into the system. Because of the latent heat of vaporization of liquid helium is very low