Heat transfer pin of heat exchanger

Abstract

A heat transfer pin of a heat exchanger, in which slits in the first row, slits in the second row, slits in the third row, and slits in the fourth row are arranged in parallel with an inflow direction of Pal air such that the interval between a virtual line crossing the centers of heat transfer pipes and the slit in the second or third row is larger than the interval between the slit in the first row and the slit in the second row or the interval between the slit in the third row and the slit in the fourth row, and is at least three times the width of each of the slits in the first to fourth rows, thus easily discharging condensed water formed on the heat transfer pipes to the outside and reducing resistance when the air flows. The slits in the first and second rows and the slits m the third and fourth rows, each having the shape of a parallelogram, are symmetrical with each other for the virtual line crossing the centers of the heat transfer pipes.

1 . A heat transfer pin of a heat exchanger, installed in an indoor unit of an air conditioner at a designated gradient and comprising slits in the first row, slits in the second row, slits in the third row, and slits in the fourth row, which are arranged in parallel between neighboring heat transfer pipes in order in an inflow direction of external air, wherein: 
 the slits in the first and second rows and the slits in the third and fourth rows, each having a shape of a parallelogram, are symmetrical with each other with respect to a virtual line crossing the centers of the heat transfer pipes on the standardized heat transfer pin; and    the interval between the virtual line and the slit in the second or third row is larger than the interval between the slit in the first row and the slit in the second row or the interval between the slit in the third row and the slit in the fourth row, and is at least three times the width of each of the slits in the first to fourths rows.    
   
   
       2 . The heat transfer pin as set forth in  claim 1 , wherein the slits in the first to fourth rows meet a line parallel with the lengthwise edge of the heat transfer pin at a tilt angle of 5° to 10°.  
   
   
       3 . The heat transfer pin as set forth in  claim 1 , wherein the slit in the first row and the slit in the second row have different lengths under the condition that ends of the slits in the first and second rows opposite to the side of the heat transfer pin, into which the external air flows, contact a tangent line parallel with the tangent line of the neighboring heat transfer pipe.  
   
   
       4 . The heat transfer pin as set forth in  claim 3 , wherein the length of the slit in the first row is 0.5 to 0.8 times the length of the slit in the second row.  
   
   
       5 . The heat transfer pin as set forth in  claim 1 , wherein ends of the slits in the first and second rows, which directly contact the flowing external air, meet the inflow direction of the external air at a tilt angle of 70° to 80°.  
   
   
       6 . The heat transfer pin as set forth in  claim 2 , wherein ends of the slits in the first and second rows, which directly contact the flowing external air, meet the inflow direction of the external air at a tilt angle of 70° to 80°.  
   
   
       7 . The heat transfer pin as set forth in  claim 3 , wherein ends of the slits in the first and second rows, which directly contact the flowing external air, meet the inflow direction of the external air at a tilt angle of 70° to 80°.  
   
   
       8 . The heat transfer pin as set forth in  claim 4 , wherein ends of the slits in the first and second rows, which directly contact the flowing external air, meet the inflow direction of the external air at a tilt angle of 70° to 80°.