| 摘要 |
PROBLEM TO BE SOLVED: To provide an extremely low temperature refrigerating device with a defrost circuit, preventing the supply of lubricating oil to a cooler by reliably removing the lubricating oil without impairing the cooling efficiency thereof. SOLUTION: In the extremely low temperature refrigerating device, a first oil separator 15 is connected to a discharge portion of a compressor 20 and the first oil separator 15 is connected to an inlet side of a cryo-coil 52 via the defrost circuit 60. To the defrost circuit 60, a second oil separator 16 is connected for separating from gas refrigerant the lubricating oil which is not completely removed by the first oil separator 15. COPYRIGHT: (C)2005,JPO&NCIPI
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