Heat exchanger

Abstract

Heat exchanger comprising a pair of header tanks which are arranged to be spaced apart from each other, a plurality of tubes formed in two columns in the width direction so that both ends are connected to the pair of header tanks, and a plurality of fins interposed between the tubes and coupled to the tubes. The header tank is configured so that a first tank and a second tank are respectively coupled to one header having a central bent portion in the center portion in the width direction, which provides easy assembling of headers and tanks of two heat exchangers. Thermal stress caused by the temperature difference between two heat exchanging media is blocked so that damage to a coupling portion where the two heat exchangers are coupled or a bonding portion formed through brazing can be prevented. Thus, leakage of the heat exchanging medium can be prevented.

What is claimed is: 
     
         1 . A heat exchanger comprising:
 a header comprising a pair of header tanks disposed spaced apart from each other, a plurality of tubes formed in two columns in the width direction and connected at both ends thereof to the pair of header tanks, and a plurality of fins interposed between the tubes and coupled to the tubes,   wherein tube insertion holes into which the plurality of tubes are inserted is formed in two columns in one or more of the pair of header tanks, and a central bent portion is formed protruding between a first row of tube insertion holes and a second row of tube insertion holes;   a first tank coupled to one side of the header with respect to the central bent portion and having a space formed therein through which a heat exchanging media flows; and   a second tank coupled to the other side of the header with respect to the central bent portion of the header and having a space formed therein through which the heat exchanging media flows.   
     
     
         2 . The heat exchanger of  claim 1 , wherein the central bent portion of the header comprises:
 a pair of vertical portions extending toward the first and second tanks, respectively, at positions spaced apart in the width direction of the horizontal portion in which the tube insertion holes are formed; and   a connection portion configured to connect ends of the pair of vertical portions.   
     
     
         3 . The heat exchanger of  claim 2 , wherein at least a portion of the connection portion has a curved cross-sectional shape. 
     
     
         4 . The heat exchanger of  claim 2 , wherein the connection portion has a condensate water drainage hole formed through both surfaces of the connection portion. 
     
     
         5 . The heat exchanger of  claim 2 , wherein the header has a protruding bent portion formed in a center portion of the connection portion of the central bent portion in the width direction, and formed in the shape corresponding to the central bent portion. 
     
     
         6 . The heat exchanger of  claim 5 , wherein the protruding bent portion is at least partially cut and removed. 
     
     
         7 . The heat exchanger of  claim 1 , wherein the header has lateral surface bent portions formed at both ends of the horizontal portion in the width direction toward the first tank and the second tank. 
     
     
         8 . The heat exchanger of  claim 1 , wherein the fins are integrated fins having one side thereof coupled to the first column tube and the other side thereof coupled to the second column tube in the width direction. 
     
     
         9 . The heat exchanger of  claim 1 , wherein each of the pair of header tanks further comprises a baffle coupled to the header and the first tank and configured to divide an internal space of the header tank. 
     
     
         10 . The heat exchanger of  claim 9 , wherein heat exchanging media having different temperatures flows in different areas divided by the baffles. 
     
     
         11 . The heat exchanger of  claim 10 , wherein a pair of baffles spaced apart from each other is provided in each of the header tanks, and a dummy tube is connected at a position corresponding to a portion between the pair of baffles that are spaced apart. 
     
     
         12 . The heat exchanger of  claim 1 , wherein the first heat exchanging portion disposed in the first row including the first column tubes is a radiator, the second heat exchanging portion disposed in the second row including the second column tubes is a condenser, and
 wherein the first heat exchanging portion is disposed upstream and the second heat exchanging portion is disposed downstream in a flow direction of cooling air.