Refrigerating apparatus

Abstract

There is disclosed a refrigerating apparatus which can more efficiently cool the inside of a chamber to an ultralow temperature. In a refrigerating apparatus R 1 which condenses a refrigerant discharged from a compressor 14 , reduces a pressure of the refrigerant by a capillary tube 18 and evaporates the refrigerant by an evaporator 13 to exert a cooling function, the capillary tube 18 is passed through a suction piping line 32 through which the refrigerant returning from the evaporator 13 to the compressor 14 flows, to constitute a double tube structure. Furthermore, the suction piping line 32 (a piping line 32 A) formed in the double tube structure by passing the capillary tube 18 therethrough is surrounded with an insulating material 35.

1 . A refrigerating apparatus which condenses a refrigerant discharged from a compressor, reduces a pressure of the refrigerant by a capillary tube, and evaporates the refrigerant by an evaporator to exert a cooling function,
 wherein the capillary tube is passed through a suction piping line through which the refrigerant returning from the evaporator to the compressor flows, to constitute a double tube structure.   
     
     
         2 . A refrigerating apparatus comprising: a high temperature side refrigerant circuit and a low temperature side refrigerant circuit to constitute independent closed refrigerant circuits, each of which condenses a refrigerant discharged from a compressor, reduces a pressure of the refrigerant by a capillary tube and evaporates the refrigerant by an evaporator to exert a cooling function, the evaporator of the high temperature side refrigerant circuit and a condenser of the low temperature side refrigerant circuit constituting a cascade heat exchanger, the evaporator of the low temperature side refrigerant circuit being configured to exert a final cooling function,
 wherein the capillary tube of the low temperature side refrigerant circuit is passed through a suction piping line through which the refrigerant returning from the evaporator to the compressor of the low temperature side refrigerant circuit flows, to constitute a double tube structure.   
     
     
         3 . A refrigerating apparatus which comprises a compressor, a condenser, an evaporator, a single or a plurality of intermediate heat exchangers connected so that a refrigerant returning from the evaporator circulates therethrough and a plurality of capillary tubes and into which a plurality of types of non-azeotropic mixed refrigerants are introduced and which allows a condensed refrigerant of the refrigerants flowing through the condenser to join the refrigerants in the intermediate heat exchangers through the capillary tubes, cools a non-condensed refrigerant of the refrigerants in the intermediate heat exchangers to condense the refrigerant having a lower boiling point, and evaporates the refrigerant having the lowest boiling point by the evaporator through the capillary tube of the final stage to exert a cooling function,
 wherein the capillary tube of the final stage is passed through a suction piping line through which the refrigerant returning from the evaporator to the compressor flows, to constitute a double tube structure.   
     
     
         4 . A refrigerating apparatus comprising: a high temperature side refrigerant circuit and a low temperature side refrigerant circuit to constitute independent closed refrigerant circuits, each of which condenses a refrigerant discharged from a compressor, reduces a pressure of the refrigerant by a capillary tube and evaporates the refrigerant by an evaporator to exert a cooling function, the low temperature side refrigerant circuit comprising the compressor, a condenser, the evaporator, a single or a plurality of intermediate heat exchangers connected so that the refrigerant returning from the evaporator circulates therethrough and a plurality of capillary tubes, a plurality of types of non-azeotropic mixed refrigerants being introduced, the refrigerating apparatus having a constitution which allows a condensed refrigerant of the refrigerants flowing through the evaporator to join the refrigerants in the intermediate heat exchangers through the capillary tubes, cools a non-condensed refrigerant of the refrigerants in the intermediate heat exchangers to condense the refrigerant having a lower boiling point, and evaporates the refrigerant having the lowest boiling point by the evaporator through the capillary tube of the final stage to exert the cooling function, the evaporator of the high temperature side refrigerant circuit and the condenser of the low temperature side refrigerant circuit constituting a cascade heat exchanger, the evaporator of the low temperature side refrigerant circuit being configured to exert a final cooling function,
 wherein the capillary tube of the final stage of the low temperature side refrigerant circuit is passed through a suction piping line through which the refrigerant returning from the evaporator to the compressor of the low temperature side refrigerant circuit flows, to constitute a double tube structure.   
     
     
         5 . The refrigerating apparatus according to  claim 2 , wherein the capillary tube of the high temperature side refrigerant circuit is passed through the suction piping line through which the refrigerant returning from the evaporator to the compressor of the high temperature side refrigerant circuit flows, to constitute the double tube structure. 
     
     
         6 . The refrigerating apparatus according to  claim 1 , wherein the suction piping line formed in the double tube structure by passing the capillary tube therethrough is surrounded with an insulating material. 
     
     
         7 . The refrigerating apparatus according to  claim 1 , wherein a flow of the refrigerant through the capillary tube and a flow of the refrigerant through the suction piping line outside the capillary tube form a counter flow. 
     
     
         8 . The refrigerating apparatus according to  claim 2 , wherein the suction piping line formed in the double tube structure by passing the capillary tube therethrough is surrounded with an insulating material. 
     
     
         9 . The refrigerating apparatus according to  claim 2 , wherein a flow of the refrigerant through the capillary tube and a flow of the refrigerant through the suction piping line outside the capillary tube form a counter flow. 
     
     
         10 . The refrigerating apparatus according to  claim 3 , wherein the suction piping line formed in the double tube structure by passing the capillary tube therethrough is surrounded with an insulating material. 
     
     
         11 . The refrigerating apparatus according to  claim 3 , wherein a flow of the refrigerant through the capillary tube and a flow of the refrigerant through the suction piping line outside the capillary tube form a counter flow. 
     
     
         12 . The refrigerating apparatus according to  claim 4 , wherein the suction piping line formed in the double tube structure by passing the capillary tube therethrough is surrounded with an insulating material. 
     
     
         13 . The refrigerating apparatus according to  claim 4 , wherein a flow of the refrigerant through the capillary tube and a flow of the refrigerant through the suction piping line outside the capillary tube form a counter flow. 
     
     
         14 . The refrigerating apparatus according to  claim 5 , wherein the suction piping line formed in the double tube structure by passing the capillary tube therethrough is surrounded with an insulating material. 
     
     
         15 . The refrigerating apparatus according to  claim 5 , wherein a flow of the refrigerant through the capillary tube and a flow of the refrigerant through the suction piping line outside the capillary tube form a counter flow. 
     
     
         16 . The refrigerating apparatus according to  claim 6 , wherein a flow of the refrigerant through the capillary tube and a flow of the refrigerant through the suction piping line outside the capillary tube form a counter flow. 
     
     
         17 . The refrigerating apparatus according to  claim 4 , wherein the capillary tube of the high temperature side refrigerant circuit is passed through the suction piping line through which the refrigerant returning from the evaporator to the compressor of the high temperature side refrigerant circuit flows, to constitute the double tube structure. 
     
     
         18 . The refrigerating apparatus according to  claim 17 , wherein the suction piping line formed in the double tube structure by passing the capillary tube therethrough is surrounded with an insulating material. 
     
     
         19 . The refrigerating apparatus according to  claim 17 , wherein a flow of the refrigerant through the capillary tube and a flow of the refrigerant through the suction piping line outside the capillary tube form a counter flow.