| 摘要 |
PROBLEM TO BE SOLVED: To provide a refrigeration unit, in which chamber temperature can be secured stably, and the oil can be positively returned. SOLUTION: A refrigerating circuit is constituted by connecting in succession a compressor 3, condensers 4, 5, an expansion valve V3, an evaporator 10, etc.; the evaporator in the circuit is of a multi-circuit structure; the refrigerant circuit is formed, so that the refrigerant is supplied dividedly in a plurality of circuits; and further, a selection means V5 is provided to allow the refrigerant to flow selectively in a specific circuit among the plurality of circuits in a volume-control operation.
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