METHOD AND DEVICE FOR COOLING/LIQUEFACTION AT LOW TEMPERATURE Russian patent published in 2015 - IPC F25B9/06 

FIELD: heating.

SUBSTANCE: group of inventions relates to a method of cooling/liquefaction at low temperature of the working fluid, in particular the working fluid having helium in its composition or constituting pure helium, using the device of cooling/liquefaction, comprising a working circuit equipped with a compression station and a cold unit. In the device of cooling or liquefaction the working gas is subjected in the operating circuit to the cycle impact, comprising sequentially compressing the working fluid in the compression station, cooling and expansion of this working fluid in the cold unit and heating with the working fluid with the purpose to return it to the compression station. This compression station comprises one or more compression stages, in each of which one or more compressors are used, mounted on the supports. The cooling device comprises a device of obstructive gas injection, different from the working fluid, at the level of one support of one or more compressors in order to form the gas barrier directing leakage of the working fluid from the working circuit in the direction of the recirculation zone and the return of this working fluid to the working circuit.

EFFECT: group of inventions is aimed at improving reliability and economical efficiency.

25 cl, 5 dwg