Air conditioner

Abstract

The present invention relates to an air conditioner, more particularly, it returns the oil from the shell and tube type of evaporator or directs the returned oil from the oil separator of the compressor into the compressor to reuse. And, it comprises an oil recovery flow path passing a condenser so that the oil and the refrigerant mixed with the oil is superheated or supercooled by using the heat discharged from heat-exchange units of the fin and tube type of condenser. Therefore, it is possible to improve the heat exchange performance of the evaporator.

1 . An air conditioner comprising:
 a compressor which compresses refrigerant;   a condenser which comprises a heat exchange unit having a refrigerant tube for passing refrigerant and a plurality of radiating fins disposed around the refrigerant tube in a body, and condenses refrigerant compressed in the compressor by heat-exchanging with air passing through the heat exchange unit;   an expansion device for expanding refrigerant condensed by the condenser;   an evaporator for evaporating refrigerant expanded by the expansion device, and an oil recovery flow path which returns oil from any one of the evaporator and the compressor, brings the oil into the compressor again, and passes through the condenser for superheating or supercooling the oil and the refrigerant mixed with the oil by passing the heat exchange unit of the condenser.   
     
     
         2 . The air conditioner of  claim 1 ,
 wherein an oil tube is disposed in the heat exchange unit to form a portion of the oil recovery flow path.   
     
     
         3 . The air conditioner of  claim 2 ,
 wherein the heat exchange units make a pair that, a gap between each of lower sides is smaller than a gap between each of the upper sides,   and the oil tube is formed at the lower side of any one of the heat exchange units in a body.   
     
     
         4 . The air conditioner of  claim 2 ,
 wherein the heat exchange units make a pair that a gap between each of the lower sides is smaller than a gap between each of the upper sides, and several pairs of the heat exchange units forms a plurality of columns and are disposed at regular intervals,   and the oil tube is formed at the lower side of any one of the heat exchange units in a body.   
     
     
         5 . The air conditioner of  claim 2 ,
 wherein the heat exchange units make a pair that a gap between each of the lower sides is smaller than a gap between each of the upper sides, and several pairs of the heat exchange unit form a plurality of columns and are disposed at regular intervals,   and the oil tube is formed at each lower side of the heat exchange units in a body.   
     
     
         6 . The air conditioner of  claim 3 ,
 further comprises a fan for blowing air to pass the heat exchange unit.   
     
     
         7 . The air conditioner of  claim 6 ,
 wherein the heat exchange unit comprises a plurality of pipe columns which are parallel to a surface of the heat exchange unit in which the air flows by the fan,   some of a plurality of pipe columns are the refrigerant tube and the oil tube, and the rest of a plurality of pipe columns are the refrigerant tube.   
     
     
         8 . The air conditioner of  claim 7 ,
 wherein the oil tube in the pipe columns having the refrigerant tube and the oil tube is disposed at the last column close to the other surface of the heat exchange unit which air flows out.   
     
     
         9 . The air conditioner of  claim 2 ,
 wherein the heat exchange unit make a pair that a gap between each of the lower sides is smaller than a gap between each of the upper sides, and several pairs of the heat exchange units form a plurality of columns and are disposed at regular intervals,   and the heat exchange unit further comprises an oil tube which forms a portion of the oil recovery flow path and an oil cooler disposed a space between a plurality heat exchange units and a fan which blows air to pass the heat exchange part.   
     
     
         10 . The air conditioner of  claim 9 ,
 wherein the fan is disposed at the upper side of the oil cooler.   
     
     
         11 . The air conditioner of  claim 10 ,
 wherein the oil cooler and any one of the opposite face of the heat exchange units are parallel to each other.   
     
     
         12 . The air conditioner of  claim 11 ,
 wherein the oil cooler is contact with the radiating fin.   
     
     
         13 . The air conditioner of  claim 10 ,
 wherein, the oil cooler is disposed to be horizontal at a space between the heat exchange units.