Patent ID: 7305846

Claim:
A refrigerating apparatus that is provided with a refrigerant circuit ( 20 ) in which a first cooling circuit ( 110 , 120 ) including a first heat exchanger ( 111 , 121 ) for cooling inside and a second cooling circuit ( 30 ) including a second heat exchanger ( 131 ) for cooling inside and a sub compressor ( 141 ), which are connected in series, are connected in parallel to a heat source side circuit ( 40 ) including a heat source side heat exchanger ( 43 ) and a main compressor ( 41 ) and that performs a refrigeration cycle by circulating refrigerant in the refrigerant circuit ( 20 ), wherein in the refrigerant circuit ( 20 ), a switching mechanism ( 142 ) is provided which switches between a first operation where the sub compressor ( 141 ) sucks the refrigerant from the second heat exchanger ( 131 ) and discharges it to an intake side of the main compressor ( 41 ) and a second operation where the sub compressor ( 141 ) sucks the refrigerant from the first heat exchanger ( 111 , 121 ) and discharges it to the second heat exchanger ( 131 ), and during defrosting operation for defrosting the second heat exchanger ( 131 ), the second operation is performed in the refrigerant circuit ( 20 ) and the refrigerant is sent from the second heat exchanger ( 131 ) to the first heat exchanger ( 111 , 121 ).