Fin for heat exchanger and heat exchanger using the fin

Abstract

The present invention discloses a fin for a heat exchanger, the fin comprises a plurality of fin plates which are adjacent to one another, each of the fin plates is formed with louvers; and a connecting portion which connects adjacent fin plates at an end of the adjacent fin plates. The connecting portion comprises a middle curved section and side curved sections located on the sides of the middle curved section, and the curvature radius of the middle curved section is larger than the curvature radius of the side curved sections. With the technical solution of the invention, since the contact area between the flat tubes and the fin increases, the fin efficiency is increased and thus the heat exchange performance of the heat exchanger is enhanced

1 . A fin for a heat exchanger, said fin comprising:
 a plurality of fin plates which are adjacent to one another, each of the fin plates being formed with louvers, and   a connecting portion which connects adjacent fin plates at an end of the adjacent fin plates;   wherein the connecting portion comprises a middle curved section and side curved sections located on the sides of said middle curved section, and the curvature radius of the middle curved section is larger than the curvature radius of the side curved sections.   
     
     
         2 . The fin as claimed in  claim 1 , wherein the middle curved section is a circular arc section. 
     
     
         3 . The fin as claimed in  claim 1 , wherein the middle curved section is an elliptical arc section. 
     
     
         4 . The fin as claimed in  claim 2 , wherein the side curved sections are circular arc sections. 
     
     
         5 . The fin as claimed in  claim 1 , wherein the connecting portion is an elliptical arc connecting portion. 
     
     
         6 . The fin as claimed in  claim 1 , wherein said fin is made of aluminium alloy. 
     
     
         7 . The fin as claimed in  claim 2 , wherein the central angle of the middle circular arc section is smaller than or equal to 90°. 
     
     
         8 . The fin as claimed in  claim 2 , wherein the range of the radius R of the middle circular arc section is 0.35 mm≦R≦1 mm. 
     
     
         9 . The fin as claimed in  claim 8 , wherein said side curved sections are circular arc sections, the range of the radius r of the side circular arc sections is r≦0.2 mm. 
     
     
         10 . The fin as claimed in  claim 1 , wherein said fin has at least one of the following features:
 a. the angle b of the fin plates satisfies the following formula:
   1.2f≦tan b≦3.9f 
   where b is the angle of the fin plates, f is the friction coefficient between water and the surface of the fin plates;   b. the range of the pitch P of the fin plates is 2.9 mm≦P≦9 mm;   c. the range of the louver gap S of the louvers is S≧0.57 mm;   d. the range of the pitch W_Louver of the louvers is W_Louver≧1 mm;   e. the range of the ratio of the height H_Louver of the louvers and the height H_Fin of the fin is 0.88≦H_Louver/H_Fin≦1.02.   
     
     
         11 . A fin for a heat exchanger, said fin comprising:
 a plurality of fin plates which are adjacent to one another, each of the fin plates being formed with louvers, and   a curved connecting portion which connects adjacent fin plates at an end of the adjacent fin plates;   wherein said fin has at least one of the following features:   a. the angle b of the fin plates satisfies the following formula:
   1.2f≦tan b≦3.9f 
   where b is the angle of the fin plates, f is the friction coefficient between water and the surface of the fin plates;   b. the range of the pitch P of the fin plates is 2.9 mm≦P≦9 mm;   c. the range of the louver gap S of the louvers is S≧0.57 mm;   d. the range of the pitch W_Louver of the louvers is W_Louver≧1 mm;   e. the range of the ratio of the height H_Louver of the louvers and the height H_Fin of the fin is 0.88≦H_Louver/H_Fin≦1.02.   
     
     
         12 . The fin as claimed in  claim 11 , wherein said curved connecting portion is a circular arc connecting portion. 
     
     
         13 . The fin as claimed in  claim 12 , wherein said circular arc connecting portion has at least one of the following features:
 the value of the central angle of the circular arc connecting portion is smaller than or equal to 90°;   the range of the radius R of the circular arc connecting portion is 0.35 mm≦R≦1 mM.   
     
     
         14 . A heat exchanger comprising:
 two spaced apart header pipes;   a plurality of tubes extending between the header pipes; and   a fin disposed between adjacent tubes, said fin comprising:
 a plurality of fin plates which are adjacent to one another, each of the fin plates being formed with louvers, and 
 a connecting portion which connects adjacent fin plates at an end of the adjacent fin plates; 
 wherein the connecting portion comprises a middle curved section and side curved sections located on the sides of said middle curved section, and the curvature radius of the middle curved section is larger than the curvature radius of the side curved sections. 
   
     
     
         15 . The heat exchanger as claimed in  claim 14 , wherein said heat exchanger is a parallel flow heat exchanger with the header pipes being installed horizontally. 
     
     
         16 . A heat exchanger comprising:
 two spaced apart header pipes;   a plurality of tubes extending between the header pipes; and   a fin disposed between adjacent tubes, said fin comprising:
 a plurality of fin plates which are adjacent to one another, each of the fin plates being formed with louvers, and 
 a curved connecting portion which connects adjacent fin plates at an end of the adjacent fin plates; 
 wherein said fin has at least one of the following features:
 a. the angle b of the fin plates satisfies the following formula:
   1.2f≦tan b≦3.9f 
 
 where b is the angle of the fin plates, f is the friction coefficient between water and the surface of the fin plates; 
 b. the range of the pitch P of the fin plates is 2.9 mm≦P≦9 mm; 
 c. the range of the louver gap S of the louvers is S>0.57 mm; 
 d. the range of the pitch W_Louver of the louvers is W_Louver≧1 mm; 
 e. the range of the ratio of the height H_Louver of the louvers and the height H_Fin of the fin is 0.88≦H_Louver/H_Fin≦1.02. 
 
   
     
     
         17 . The heat exchanger as claimed in  claim 16 , wherein said heat exchanger is a parallel flow heat exchanger with the header pipes being installed horizontally.