| 摘要 |
PROBLEM TO BE SOLVED: To (1) restart a compressor in a short time by reducing the time required for attaining pressure balance of the compressor, and (2) prevent the viscosity of refrigeration machine oil from being lowered due to suction of liquefied refrigerant of the compressor at the time of restarting. SOLUTION: The purpose (1) is achieved by controlling, in preparation for restarting the compressor after an interruption of the compressor, a bypass valve of a bypass circuit connected to a high pressure section and a low pressure section during the interruption of the compressor to make a high pressure section gas in a refrigeration cycle to bypass to a low pressure section in the cycle, to regulate the pressure inside the compressor to an intermediate pressure between a high pressure side pressure and a low pressure side pressure, and further to regulate the pressure difference between the low pressure and the intermediate pressure of the compressor within a range in which the compressor can be restarted. The purpose (2) is achieved by disposing a check valve between the high pressure side condenser and an inlet of the bypass circuit so as to prevent the liquefied refrigerant in the high pressure side condenser from flowing to the low pressure side when the bypass valve is opened.
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