Multi -Channeled Flat Tube And Heat Exchanger

Abstract

There is provided a multi-channeled flat tube that includes a flat outer tube and a plurality of partitions that divide the inside of the outer tube into a plurality of channels. Each partition in the multi-channeled flat tube has a mountain-shaped cross-sectional form composed of two sides, each of the two sides has a thickness ti and a length a, the partitions are disposed so that a face-to-face distance between adjacent partitions along inner surfaces of the outer tube is Li, and a thickness to of the outer tube satisfies a condition below. By selecting an appropriate pressure when expanding the multi-channeled flat tube, it is possible to prevent deformation of the tube outer surface into a wavy or undulating pattern Li · ti · a 2 - ti 2 3 ⁢ a ≦ to .

1 . A multi-channeled flat tube comprising: 
 a flat outer tube; and    a plurality of partitions that divide an inside of the outer tube into a plurality of channels,    wherein each of the plurality of partitions has a mountain-shaped cross-sectional form composed of two sides, each of the two sides has a thickness ti and a length a, the plurality of partitions are disposed so that a face-to-face distance between adjacent partitions of the plurality of partitions along inner surfaces of the outer tube is Li, and a thickness to of the outer tube satisfies a condition below                        Li   ·   ti   ·         a   2     -     ti   2             3   ⁢           ⁢   a         ≦     to   .             Equation   ⁢           ⁢   1                 
   
   
       2 . The multi-channeled flat tube according to  claim 1 , wherein the thickness to of the outer tube also satisfies a condition below  
     
       
         
           
             
               
                 
                   
                     2 
                     ⁢ 
                     
                       
                         
                           Li 
                           · 
                           ti 
                           · 
                           
                             
                               
                                 a 
                                 2 
                               
                               - 
                               
                                 ti 
                                 2 
                               
                             
                           
                         
                         
                           3 
                           ⁢ 
                           
                               
                           
                           ⁢ 
                           a 
                         
                       
                     
                   
                   ≧ 
                   
                     to 
                     . 
                   
                 
               
               
                 
                   Equation 
                   ⁢ 
                   
                       
                   
                   ⁢ 
                   2 
                 
               
             
           
         
       
     
   
   
       3 . The multi-channeled flat tube according to  claim 1 , wherein the thickness to of the outer tube also satisfies a condition below  
     
       
         
           
             
               
                 
                   
                     
                       
                         Li 
                         · 
                         ti 
                       
                       2 
                     
                   
                   ≧ 
                   
                     to 
                     . 
                   
                 
               
               
                 
                   Equation 
                   ⁢ 
                   
                       
                   
                   ⁢ 
                   3 
                 
               
             
           
         
       
     
   
   
       4 . A heat exchanger comprising: 
 a plurality of multi-channeled flat tubes according to  claim 1;  and    a plurality of fins that are attached to the plurality of multi-channeled flat tubes and the plurality of multi-channeled flat tubes passing through the plurality of fins.