Refrigeration apparatus

Abstract

There is disclosed a refrigeration apparatus capable of quickly collecting, in an expansion tank, a refrigerant in a refrigerant circuit during the stop of a compressor and capable of decreasing a load to be applied to the compressor during restart. A refrigeration apparatus 1 of the present invention includes a refrigerant circuit 38 in which the refrigerant discharged from a compressor 20 is condensed and then evaporated to exert a cooling function, and an expansion tank 65 connected to a pipe 20 S of the compressor 20 on a suction side via a capillary tube 66 , the capillary tube 66 is connected in parallel with a check valve 67 , and the direction of the expansion tank 65 is the forward direction of the check valve.

1 . A refrigeration apparatus comprising:
 a refrigerant circuit in which a refrigerant discharged from a compressor is condensed and then evaporated to exert a cooling function; and   a tank connected to a pipe of the compressor on a suction side via a pressure reducing unit, the pressure reducing unit being connected in parallel with a check valve, the direction of the tank being the forward direction of the check valve.   
   
   
       2 . A refrigeration apparatus comprising:
 a high-temperature-side refrigerant circuit and a low-temperature-side refrigerant circuit each constituting an independent refrigerant closed circuit in which a refrigerant discharged from a compressor is condensed and then evaporated to exert a cooling function, an evaporator of the high-temperature-side refrigerant circuit and a condenser of the low-temperature-side refrigerant circuit constituting a cascade heat exchanger, an evaporator of the low-temperature-side refrigerant circuit achieving an extremely low temperature; and   a tank connected to a pipe of the compressor of the low-temperature-side refrigerant circuit on a suction side via a pressure reducing unit, the pressure reducing unit being connected in parallel with a check valve, the direction of the tank being the forward direction of the check valve.   
   
   
       3 . A refrigeration apparatus comprising: a compressor, a condenser, an evaporator, and a plurality of intermediate heat exchangers and a plurality of pressure reducing units connected in series so that a refrigerant fed back from the evaporator circulates, wherein a plurality of types of non-azeotropic mixed refrigerants are introduced, a condensed refrigerant in the refrigerants fed through the condenser is allowed to join the intermediate heat exchanger via the pressure reducing unit, and a non-condensed refrigerant in the refrigerants is cooled by the intermediate heat exchanger to successively condense the refrigerant having a lower boiling point, and the refrigerant having the lowest boiling point is allowed to flow into the evaporator via the final-stage pressure reducing unit to obtain an extremely low temperature,
 the refrigeration apparatus further comprising: a tank connected to a pipe of the compressor on a suction side via the pressure reducing unit, the pressure reducing unit being connected in parallel with a check valve, the direction of the tank being the forward direction of the check valve.   
   
   
       4 . A refrigeration apparatus comprising: a high-temperature-side refrigerant circuit and a low-temperature-side refrigerant circuit each constituting an independent refrigerant closed circuit in which a refrigerant discharged from a compressor is condensed and then evaporated to exert a cooling function, the low-temperature-side refrigerant circuit having the compressor, a condenser, an evaporator, and a plurality of intermediate heat exchangers and a plurality of pressure reducing units connected in series so that the refrigerant fed back from the evaporator circulates, wherein a plurality of types of non-azeotropic mixed refrigerants are introduced, a condensed refrigerant in the refrigerants fed through the condenser is allowed to join the intermediate heat exchanger via the pressure reducing unit, a non-condensed refrigerant in the refrigerants is cooled by the intermediate heat exchanger to successively condense the refrigerant having a lower boiling point, the refrigerant having the lowest boiling point is allowed to flow into the evaporator via the final-stage pressure reducing unit, an evaporator of the high-temperature-side refrigerant circuit and the condenser of the low-temperature-side refrigerant circuit constitute a cascade heat exchanger, and the evaporator of the low-temperature-side refrigerant circuit obtains an extremely low temperature,
 the refrigeration apparatus further comprising: a tank connected to a pipe of the compressor of the low-temperature-side refrigerant circuit on a suction side via the pressure reducing unit, the pressure reducing unit being connected in parallel with a check valve, the direction of the tank being the forward direction of the check valve.