Heat exchanger fin for air conditioner

Abstract

The present invention discloses a heat exchanger fin having three rows of slit parts being arranged at the air inlet side and another three rows at the air outlet side relative to the centerline of heat transfer pipes 102 , in order to reduce the ventilating resistance, prevent the growth of a boundary layer and reduce a dead zone on the downstream of the heat transfer pipes 102 to thus increase heat transfer performance. The outer slit parts 111 and 111 ′; and 116 and 116 ′ at the air inlet side and at the air outlet side are formed in pairs. The middle slit parts 112 and 112 ′ at the air inlet side are formed in pairs and the middle slit part 114 at the air outlet side is formed in a unit. The inner slit parts 113 and 114 at the air inlet side and at the air outlet side are also formed in a unit. Therefore, the heat exchanger can reduce the airflow pressure drop and thus can increase air volume, and can improve the evaporation performance by increasing the heat transfer rate between the air and the fin surface.

What is claimed is:  
     
         1 . A heat exchanger fin for an air conditioner comprising an air inlet side group of slit parts and an air outlet side group of slit parts being arranged between two heat transfer pipes, respectively, each of the slit parts being formed by a pair of rising portions whose ends project from the fin surface as well as a bridging portion spanning between the rising portions, central edge portions which are located at an inlet end portion of the air inlet side and an outlet end portion of the air outlet side, respectively, and intermediate flat portions being formed between adjacent those of the slit parts, the heat exchanger fin characterized in that: 
 the air inlet side group of slit parts includes a pair of outer slit parts, a pair of middle slit parts, and an inner slit part sequentially from the inlet end, wherein each of the first rising portions of the outer slit parts and the middle slit parts is parallel to the direction l of air current (A) and each of the second rising portions of the outer slit parts and the middle slit parts are parallel to the outer tangential line (m) of the heat transfer pipes, and the opposite rising portions of the inner slit part are parallel to the direction of air current (A); and    the air outlet side group of slit parts includes a pair of outer slit parts, a middle slit part, and an inner slit part sequentially from the outlet end, wherein the first rising portions of the outer slit parts are parallel to the direction l of air current (A) and the second rising portions are parallel to the outer tangential line (m) of the heat transfer pipes, the opposite rising portions of the middle slit parts are parallel to the outer tangential line (m) of the heat transfer pipes, and the opposite rising portions of the inner slit part are parallel to the direction of air current (A).    
     
     
         2 . The heat exchanger fin of  claim 1 , characterized in that the spacing between the first rising portions of the outer slit parts at the air inlet side is larger than the spacing between the first rising portions of the middle slit parts, whereby the second rising portions of the outer slit parts and the middle slit parts are arranged more adjacently, but approximately the same distance from the heat transfer pipes.  
     
     
         3 . The heat exchanger fin of  claim 1 , characterized in that the second rising portions of the middle slit parts at the air inlet side and the opposite rising portions of the middle slit parts are arranged adjacent to each other approximately the same distance from the heat transfer pipes.  
     
     
         4 . The heat exchanger fin of  claim 1 , characterized in that the slit parts project alternately on the front face and the rear face of the flat fin, or only on one of the faces of the flat fin.  
     
     
         5 . A heat exchanger fin for an air conditioner comprising a first group of slit parts being arranged between the first heat transfer pipes and a second group of slit parts being arranged between the second heat transfer pipes, each of the first and the second group of slit parts consisting of an air inlet side group of slit parts and an air outlet side group of slit parts being arranged between two heat transfer pipes, respectively, each of the slit parts being formed by a pair of rising portions whose ends project from the fin surface as well as a bridging portion spanning between the rising portions, central edge portions which are located at an inlet end portion of the air inlet side and an outlet end portion of the air outlet side, respectively, and intermediate flat portions formed between adjacent those of the slit parts, the heat exchanger fin characterized in that: 
 each of the air inlet side group of slit parts of the first and the second group of slit parts includes a pair of outer slit parts, a pair of middle slit parts, and an inner slit part sequentially from the inlet end, wherein each of the first rising portions of the outer slit parts and the middle slit parts are parallel to the direction l of air current (A) and each of the second rising portions of the outer slit parts and the middle slit parts are parallel to the outer tangential line (m) of the heat transfer pipes, and the opposite rising portions of the inner slit part are parallel to the direction of air current (A); and    each of the air outlet side group of slit parts of the first and the second group of slit parts includes a pair of outer slit parts, a pair of middle slit parts, and an inner slit part sequentially from the outlet end, wherein the first rising portions of the outer and the middle slit parts are parallel to the direction l of air current (A) and the second rising portions are parallel to the outer tangential line (m) of the heat transfer pipes, and the opposite rising portions of the inner slit part are parallel to the direction of air current (A).    
     
     
         6 . The heat exchanger fin of  claim 5 , characterized in that the spacing between the first rising portions of the outer slit parts of the first and the second group of slit parts at the air inlet side is formed larger than the spacing between the first rising portions of the middle slit parts, and the second rising portions of the outer slit parts and the middle slit parts are arranged more adjacently approximately the same distance from the heat transfer pipe, respectively; and 
 the first rising portion of at least one of the outer slit parts of the first and the second group of slit parts at the air inlet side and the first rising portion at least one of the middle slit parts are arranged in parallel in the direction of air current.    
     
     
         7 . The heat exchanger fin of  claim 5 , characterized in that the spacing between the first rising portions of the outer slit parts of the first and the second group of slit parts at the air outlet side is formed larger than the spacing between the first rising portions of the middle slit parts, and second rising portions of the outer slit parts and the middle slit parts of the first and the second group of slit parts are arranged more adjacently approximately the same distance from the heat transfer pipe, respectively; and 
 the first rising portion of at least one of the outer slit parts of the first and the second group of slit parts at the air outlet side and the first rising portion at least one of the middle slit parts are arranged in parallel in the direction of air current.    
     
     
         8 . The heat exchanger fin of claims  5 , characterized in that the outer slit parts at the air outlet side of the first and the second group of slit parts are formed in symmetrically with the outer slit parts at the inlet side relative to the centerline of the first and second heat transfer pipes, respectively.  
     
     
         9 . The heat exchanger fin of claims  5 , characterized in that the middle slit parts at the air outlet side of the first and the second group of slit parts are formed in asymmetrically with the middle slit parts at the inlet side relative to the centerline of the first and second heat transfer pipes, respectively.