Low-temperature medium liquefaction device

The invention relates to a low-temperature medium liquefaction device which comprises a Dewar and a heat exchange assembly, wherein the heat exchange assembly comprises a heat exchanger, a sleeve, a refrigerator cold head, a collector tube and a transmission tube; the upper end of the sleeve is hermetically and fixedly connected to the upper part of an inner cavity of the Dewar, and the lower endof the sleeve is hermetically and fixedly communicated with the collector tube; one end of the transmission tube is hermetically and fixedly communicated with the lower part of the collector tube, the middle part of the transmission tube is hermetically and fixedly connected with the Dewar, and the other end of the transmission tube is communicated to a cooled object outside the Dewar; the upper part of the refrigerator cold head is hermetically and fixedly connected with the Dewar, the lower part of the refrigerator cold head is arranged in the inner cavity of the sleeve, and the lower end of the refrigerator cold head is connected with the heat exchanger. The low-temperature medium liquefaction device disclosed by the invention has the advantages that: the heat transfer area at the low-temperature end of the refrigerator cold head is fully utilized, the heat leakage quantity is reduced, the working efficiency is improved, the energy resources are saved, the convenience for assembly and disassembly is achieved, and the manufacturing and maintaining cost is reduced.