Air conditioner

Abstract

Air conditioner including an outdoor unit installed in outdoor having a compressor, an outdoor heat exchanger, an indoor unit installed in indoor having an indoor heat exchanger, a distributor for guiding refrigerant from the outdoor unit to the indoor unit proper to an operation condition, and refrigerant passed through the indoor unit to the outdoor unit, again, and a subcooling device for subcooling the refrigerant passed through a heat exchange process at the outdoor heat exchanger under an isobaric condition, and guiding the subcooled refrigerant to the distributor, thereby improving an air conditioning capability.

1 . An air conditioner comprising: 
 an outdoor unit installed in outdoor having a compressor, an outdoor heat exchanger;    an indoor unit installed in indoor having an indoor heat exchanger;    a distributor for guiding refrigerant from the outdoor unit to the indoor unit proper to an operation condition, and refrigerant passed through the indoor unit to the outdoor unit, again; and    a subcooling device for subcooling the refrigerant passed through a heat exchange process at the outdoor heat exchanger under an isobaric condition, and guiding the subcooled refrigerant to the distributor.    
   
   
       2 . The air conditioner as claimed in  claim 1 , wherein the subcooling device makes a portion of the refrigerant passed through the heat exchange process at the outdoor heat exchanger to expand, and the expanded portion of the refrigerant to heat exchange with rest unexpanded refrigerant.  
   
   
       3 . The air conditioner as claimed in  claim 1 , wherein the subcooling device includes; 
 a subcooling heat exchanger for making an expanded portion of the refrigerant to heat exchange with rest unexpanded refrigerant,    a first connection pipeline having an expansion device for expanding a portion of the refrigerant passed through a heat exchange process at the outdoor heat exchanger, for guiding expanded refrigerant to the subcooling heat exchanger,    a second connection pipeline for guiding unexpanded refrigerant to the subcooling heat exchanger,    a third connection pipeline for guiding unexpanded refrigerant passed through the subcooling heat exchanger to the distributor, and    a fourth connection pipeline for guiding the expanded refrigerant passed through the subcooling heat exchanger to the refrigerant pipeline connected to a suction end of the compressor.    
   
   
       4 . The air conditioner as claimed in  claim 3 , wherein the subcooling heat exchanger includes; 
 a first flow pipeline having one end connected to the second connection pipeline, and the other end connected to the third connection pipeline for flow of unexpanded refrigerant, and    a second flow pipeline having one end connected to the first connection pipeline, and the other end connected to the fourth connection pipeline for making heat exchange with the first flow pipeline, and flow of the expanded refrigerant.    
   
   
       5 . The air conditioner as claimed in  claim 4 , wherein the subcooling heat exchanger has a double pipe structure.  
   
   
       6 . The air conditioner as claimed in  claim 5 , wherein the second flow pipeline is provided in an inside of the first flow pipeline in a longitudinal direction.  
   
   
       7 . The air conditioner as claimed in  claim 6 , wherein the refrigerant flowing through the second flow pipeline has a flow direction opposite to a flow direction of the refrigerant flowing through the first flow pipeline.  
   
   
       8 . The air conditioner as claimed in  claim 6 , wherein the refrigerant flowing through the second flow pipeline has a flow direction the same with a flow direction of the refrigerant flowing through the first flow pipeline.  
   
   
       9 . The air conditioner as claimed in  claim 5 , wherein the first flow pipeline is provided inside of the second flow pipeline in a longitudinal direction.  
   
   
       10 . The air conditioner as claimed in  claim 5 , wherein the subcooling heat exchanger has a length of 1 m˜2.5 m.  
   
   
       11 . The air conditioner as claimed in  claim 5 , wherein the subcooling heat exchanger further includes a heat exchange part on an inside wall for making a heat exchange area larger.  
   
   
       12 . The air conditioner as claimed in  claim 11 , wherein the heat exchange part is projected inward from an inside wall of the inner flow pipe.  
   
   
       13 . The air conditioner as claimed in  claim 12 , wherein the heat exchange part is provided on an inside wall of the inner flow pipe in a circumferential direction.  
   
   
       14 . The air conditioner as claimed in  claim 12 , wherein the heat exchange part is provided on an inside wall of the inner flow pipe in a flow direction of the refrigerant.  
   
   
       15 . The air conditioner as claimed in  claim 12 , wherein the heat exchange part is provided on an inside wall of the inner flow pipe in a helix.  
   
   
       16 . The air conditioner as claimed in  claim 3 , wherein the expansion device is an electronic expansion valve.  
   
   
       17 . The air conditioner as claimed in  claim 3 , further comprising an accumulator on a refrigerant pipeline connected to the suction end of the compressor for separating gaseous refrigerant from liquid refrigerant.  
   
   
       18 . The air conditioner as claimed in  claim 12 , wherein the fourth connection pipeline is connected to a refrigerant pipeline connected to a refrigerant inlet to the accumulator.  
   
   
       19 . The air conditioner as claimed in  claim 1 , wherein the subcooling device is provided to a predetermined position of an inside of the outdoor unit.  
   
   
       20 . The air conditioner as claimed in  claim 1 , wherein the outdoor unit further includes a switching device for switching a flow direction of the refrigerant from the compressor to the outdoor heat exchanger or the distributor selectively proper to an operation condition.