Refrigerating machine

Abstract

A refrigerating machine having a compressor, a radiator, a pressure-reducing device, a gas-liquid separator, a unit for selectively introducing gas refrigerant separated in the gas-liquid separator into an intermediate pressure portion of the compressor, and a low pressure side circuit in which liquid refrigerant separated in the gas-liquid separator is circulated. The low pressure side circuit is provided with a heat absorbing unit functioning selectively in one of different temperature zones, and refrigerant passing through the selected heat absorbing unit is returned to a suction portion of the compressor.

1 . A refrigerating machine comprising a compressor, a radiator, a pressure-reducing device, a gas-liquid separator, a unit for selectively introducing gas refrigerant separated in the gas-liquid separator into an intermediate pressure portion of the compressor, and a low pressure side circuit in which liquid refrigerant separated in the gas-liquid separator is circulated, wherein the low pressure side circuit is provided with a heat absorbing unit functioning selectively in one of different temperature zones, and refrigerant passing through the selected heat absorbing unit is returned to a suction portion of the compressor.  
   
   
       2 . The refrigerating machine according to  claim 1 , wherein the heat absorbing unit has plural heat absorbers functioning in different temperature zones, the heat absorbers selectively function, and the refrigerating machine further comprises a unit for guiding cold air passing through the heat absorbers to chambers controlled to the corresponding temperature zones.  
   
   
       3 . The refrigerating machine according to  claim 2 , wherein the respective heat absorbers are disposed in the chambers controlled to the corresponding temperature zones.  
   
   
       4 . The refrigerating machine according to  claim 1 , wherein the heat absorbing unit is provided with one heat absorber which functions selectively in different temperature zones, and the refrigerating machine further comprises a unit for selectively guiding cold air passing through the heat absorber through a change-over dumper to plural chambers controlled to different temperature zones.  
   
   
       5 . The refrigerating machine according to  claim 4 , wherein the heat absorber is disposed in a chamber controlled to a low temperature zone.  
   
   
       6 . The refrigerating machine according to  claim 1 , wherein the refrigerant is formed of refrigerant with which the high pressure side is set to supercritical pressure under operation.  
   
   
       7 . The refrigerating machine according to  claim 6 , wherein the refrigerant is formed of carbon dioxide.