| 摘要 |
PROBLEM TO BE SOLVED: To reduce the product cost and enhance the reliability of a refrigeration device having a plurality of compressors, a supercooler and an oil cooler by simplifying the structure of the compressor and a refrigeration cycle, and by reducing the number of part items, and to make the product smaller in size and enhance its maintainability. SOLUTION: The refrigeration device includes a plurality of two-stage compressors, an oil extractor, a condenser, an evaporator, an expansion valve for the evaporator, the supercooler, an expansion valve for the supercooler, the oil cooler, and an expansion valve for the oil cooler. The supercooler is disposed between the condenser and the expansion valve for the evaporator and a high-pressure liquid medium from the condenser is diverged as it flows to the expansion valve for the evaporator. One flow of the refrigerant that is further diverged thereafter passes through the expansion valve for the supercooler, supercools the supercooler, and is sucked into the intermediate stage of one of the two-stage compressors, while the other flow of the refrigerant passes through the expansion valve for the oil cooler, cools the oil cooler, and is sucked into the intermediate stage of the other two-stage compressor.
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