| 摘要 |
A helium gas liquefying apparatus which has a compressor receiving helium gas stock, plural heat exchangers connected in series with each other via a series liquefying line, plural expansion engines connected in parallel with the corresponding heat exchangers, a Joule-Thompson's valve connected via the liquefying line, a series return line disposed in the reverse flow of the heat exchangers to the liquefying line, a three-way valve having one passage connected between the return line and the return valve and the other passage branched therefrom to the inlet of the compressor, and an additional line connected from the compressor to the three-way valve. Thus, high efficiency of Joule-Thompson's effect can be obtained.
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