| 摘要 |
PURPOSE:To make it possible to operate a refrigerator in a wide range of capability and equalize the service lives of compressors by connecting a plurality of compressors to one inverter and selecting a compressor with higher priority when only one compressor of them is used. CONSTITUTION:A refrigerator circuit 6 consists of a plurality of compressors 1 and 2 and heat exchangers 3 and 5 and an expansion mechanism 4. A heat load measuring means 8 measures the heating load from a set temperature and a current temperature by detection signals from a temperature regulator 7. With this heating load the increase or decrease in the rotational speeds of compressors is determined by a capability determination means 9, and further a compressor selection means 10 selects a compressor to be used with priority, and a selection means 11 which selects number of compressors to be used selects the number and final rotational speeds of compressors by the outputs of the capability determination means 9 and the compressor selection means 10. The range of capability of refrigerators is thereby extended and the service lives of compressors are equalized.
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