Refrigerating device and refrigerator

Abstract

An object is to provide a refrigerating device capable of realizing a high-efficiency operation in a case where a compressor having an intermediate pressure section is applied, and a refrigerator including this refrigerating device. A refrigerating device 30 includes: a compressor 1 ; a radiator 2 ; an expansion valve 3 ; a gas-liquid separator 4 ; and a heat absorbing unit 8 through which a liquid refrigerant discharged from this gas-liquid separator circulates. The refrigerating device further includes: a refrigerant pipe in which the refrigerant discharged from the heat absorbing unit 8 can be introduced into a suction port of the compressor 1 and which introduces a gas refrigerant separated by the gas-liquid separator 4 into the intermediate pressure section of the compressor 1 ; and a refrigerant pipe which introduces an intermediate-pressure refrigerant of the compressor 1 into the gas-liquid separator 4.

1 . A refrigerating device comprising: a compressor having an intermediate pressure section; a radiator connected to a discharge side of the compressor; first pressure reducing means connected to an outlet side of the radiator; a gas-liquid separator into which a refrigerant having the pressure reduced by the first pressure reducing means and having a gas and liquid mixing state is introduced to separate the refrigerant into a gas refrigerant and a liquid refrigerant; and heat absorbing means through which the liquid refrigerant discharged from the gas-liquid separator flows and which includes second pressure reducing means and a first heat sink, 
 the refrigerant discharged from the heat absorbing means being introduced into a suction port on a lower pressure side than the intermediate pressure section of the compressor,    the refrigerating device further comprising:    a first refrigerant pipe which introduces the gas refrigerant into the intermediate pressure section; and    a second refrigerant pipe which introduces an intermediate-pressure refrigerant of the compressor into the gas-liquid separator.    
   
   
       2 . The refrigerating device according to  claim 1 , wherein the second refrigerant pipe includes an oil separator which separates oil included in the refrigerant flowing in the refrigerant pipe.  
   
   
       3 . The refrigerating device according to  claim 2 , further comprising: 
 an oil duct capable of circulating the oil separated by the oil separator through the first refrigerant pipe.    
   
   
       4 . The refrigerating device according to any one of  claims 1  to  3 , wherein the heat absorbing means includes: first heat absorbing means including third pressure reducing means and a second heat sink; and second heat absorbing means disposed in parallel with the first heat absorbing means and including fourth pressure reducing means and a third heat sink, 
 the refrigerant discharged from the first heat absorbing means and the refrigerant discharged from the second heat absorbing means are combined, and introduced into the suction port on the low-pressure side,    the refrigerant pipe includes switching means for switching the refrigerant pipe to circulate the refrigerant discharged from the first heat absorbing means before the refrigerant discharged from the first heat absorbing means is combined, and one refrigerant pipe branched from this switching means is connected to the first refrigerant pipe.    
   
   
       5 . The refrigerating device according to  claim 4 , wherein the second heat sink and the third heat sink selectively function at different temperatures.  
   
   
       6 . The refrigerating device according to  claim 5 , wherein the third heat sink functions at a temperature lower than that of the second heat sink.  
   
   
       7 . The refrigerating device according to any one of  claims 1  to  6 , wherein the compressor is a two-stage compressor in which the refrigerant compressed by the first-stage compressing section is further compressed by the second-stage compressing section.  
   
   
       8 . The refrigerating device according to any one of  claims 1  to  7 , wherein a high-pressure section of a refrigeration cycle is operated in a supercritical state.  
   
   
       9 . The refrigerating device according to any one of  claims 1  to  8 , wherein carbon dioxide is used as the refrigerant.  
   
   
       10 . A refrigerator comprising: 
 the refrigerating device according to any one of  claims 1  to  9 .