Refrigerating machine

Abstract

A refrigerating machine is equipped with a compressor 1, a radiator 2, a pressure-reducing device 3, a gas-liquid separator 4, a unit for introducing the gas refrigerant separated in gas-liquid separator 4 into an intermediate pressure portion of the compressor, and a low pressure side circuit 9 in which liquid refrigerant separated in the gas-liquid separator is circulated. The low pressure side circuit 9 is provided with a heat absorbing unit 10 which selectively functions in different temperature zones. When the heat absorbing unit 10 is made to function in a high temperature zone, the gas refrigerant separated in the gas-liquid separator 4 is inhibited from being introduced into the intermediate pressure portion of the compressor 1 is inhibited, or allowed to be introduced into another intermediate pressure portion which is lower in pressure than the intermediate pressure portion.

1 . A refrigerating machine comprising: 
 a compressor;    a radiator;    a pressure-reducing device;    a gas-liquid separator;    a unit for introducing gas refrigerant separated in the gas-liquid separator into a first intermediate pressure portion of the compressor;    a low pressure side circuit in which liquid refrigerant separated in the gas-liquid separator is circulated, the low pressure side circuit being equipped with an absorbing unit functioning selectively in different temperature zones; and    a gas refrigerant introduction inhibiting/allowing unit for inhibiting introduction of the gas refrigerant separated in the gas-liquid separator into the intermediate pressure portion of the compressor when the heat absorbing unit is made to function in the high temperature zone.    
   
   
       2 . The refrigerating machine according to  claim 1 , wherein the gas refrigerant introduction inhibiting/allowing unit is constructed by an opening/closing valve.  
   
   
       3 . The refrigerating machine according to  claim 1 , wherein the heat absorbing unit is equipped with plural heat absorbers each of which functions selectively and is equipped with a unit for guiding cold air passed therethrough to a chamber controlled to the corresponding temperature zone.  
   
   
       4 . The refrigerating machine according to  claim 3 , wherein each of the heat absorbers is disposed in a chamber controlled to the corresponding temperature zone.  
   
   
       5 . The refrigerating machine according to  claim 1 , wherein the heat absorbing unit is equipped with one heat absorber which selectively functions in different temperature zones and is equipped with a unit for selectively guiding cold air passed therefrom through a switching dumper to plural chambers which are respectively controlled to different temperature zones.  
   
   
       6 . The refrigerating machine according to  claim 5 , wherein the heat absorber is disposed at a chamber controlled to a low temperature zone.  
   
   
       7 . The refrigerating machine according to  claim 1 , wherein refrigerant with which a high voltage side is set to supercritical pressure under operation is enclosed in a refrigerant circuit.  
   
   
       8 . A refrigerating machine comprising: 
 a compressor;    a radiator;    a pressure-reducing device;    a gas-liquid separator;    a unit for introducing gas refrigerant separated in the gas-liquid separator into a first intermediate pressure portion of the compressor;    a low pressure side circuit in which liquid refrigerant separated in the gas-liquid separator is circulated, the low pressure side circuit being equipped with an absorbing unit functioning selectively in different temperature zones; and    a gas refrigerant introducing unit for selectively introducing the gas refrigerant separated in the gas-liquid separator into one of the first intermediate pressure portion of the compressor any a second intermediate pressure portion nearer to a low pressure suction port of the compressor than the first intermediate pressure portion, wherein the gas refrigerant introducing unit introduces the gas refrigerant separated in the gas-liquid separator into the first intermediate pressure portion when the heat absorbing unit is made to function in a low temperature zone, and introduces the gas refrigerant separated in the gas-liquid separator into the second intermediate pressure portion of the compressor when the heat absorbing unit is made to function in a high temperature zone.    
   
   
       9 . The refrigerating machine according to  claim 8 , wherein the heat absorbing unit is equipped with plural heat absorbers each of which functions selectively and is equipped with a unit for guiding cold air passed therethrough to a chamber controlled to the corresponding temperature zone.  
   
   
       10 . The refrigerating machine according to  claim 9 , wherein each of the heat absorbers is disposed in a chamber controlled to the corresponding temperature zone.  
   
   
       11 . The refrigerating machine according to  claim 8 , wherein the heat absorbing unit is equipped with one heat absorber which selectively functions in different temperature zones and is equipped with a unit for selectively guiding cold air passed therefrom through a switching dumper to plural chambers which are respectively controlled to different temperature zones.  
   
   
       12 . The refrigerating machine according to  claim 11 , wherein the heat absorber is disposed at a chamber controlled to a low temperature zone.  
   
   
       13 . The refrigerating machine according to  claim 8 , wherein refrigerant with which a high voltage side is set to supercritical pressure under operation is enclosed in a refrigerant circuit.