Heat exchanger

Abstract

A heat exchanger, which comprises a plurality of filler metal absorption means formed on both sides of each of porous smoothing tubes provided with both ends bonded to header pipes so as to prevent filler metal from flowing from the header pipes along scratches or die lines formed in the porous smoothing tubes and melting corrugated pins, thereby remarkably reducing failures generated by the melting of the pins, and having an improved external appearance compared to conventional heat exchangers having additional cutoff means.

1 . A heat exchanger comprising: 
 a plurality of porous smoothing tubes obtained by extruding a material made of aluminum or aluminum alloy and being arranged in parallel;    a pair of header pipes bonded to the porous smoothing tubes; and    a plurality of pins interposed between the porous smoothing tubes,    wherein a plurality of filler metal absorption means are formed in parallel on portions of the porous smoothing tubes, which are bonded to the heater pipes and inserted into the header pipes, so that the filler metal absorption means absorb molten filler metal and prevent the molten filler metal from leaking to the outside to prevent pin-melting when the header pipes, the porous smoothing tubes, and the pins are bonded by brazing.    
   
   
       2 . The heat exchanger as set forth in  claim 1 , 
 wherein the filler metal absorption means are dented grooves formed in the external surfaces of the porous smoothing tubes, and have a depth of 5% to 10% of the wall thickness of the porous smoothing tubes.    
   
   
       3 . The heat exchanger as set forth in  claim 1 , 
 wherein the number of the filler metal absorption means formed at one edge of one surface of each of the porous smoothing tubes is between two and six.    
   
   
       4 . The heat exchanger as set forth in  claim 1 , 
 wherein the filler metal absorption means are symmetrically formed at both surfaces of the porous smoothing tubes.