Heat Exchanger

Abstract

A fin ( 6 ) is provided with a rib ( 15 ) extending generally parallel to an outer edge ( 25 ) of the fin ( 6 ) and insertion holes ( 22 ) placed in staggered arrangement for receiving heat exchange tubes. The insertion holes ( 22 ) and the rib ( 15 ) are formed such that when an inside diameter of the insertion holes ( 22 ) is set as D [mm], a distance between a center of the insertion hole ( 22 ) and the outer edge ( 25 ) is set as L [mm], a distance between a center of the rib ( 15 ) and the outer edge ( 25 ) is set as La [mm], a width of the rib ( 15 ) is set as LL 1 [mm], a thickness of the fin ( 6 ) is set as t [mm], a height of the rib ( 15 ) is set as h 1 [mm], and a minimum distance between the insertion holes is set as P [mm], then 0.4<La<(L−D/2−0.5), 0.15<LL 1 <0.5, 0.05<t<0.15, 0.5t<h 1 <2.5t, D<7.5, P>15, and D/P<0.5.

1 . A heat exchanger, comprising: 
 a plurality of heat transfer tubes; and    at least one plate-shaped fin ( 6 ,  73 ) having a first rib ( 15 ,  75 ) generally parallel to an outer edge ( 25 ,  77 ) of the fin and having insertion holes ( 22 ,  72 ) for receiving the heat transfer tubes,    wherein the first rib ( 15 ,  75 ) is placed closer to the outer edge ( 25 ,  77 ) than all the insertion holes ( 22 ,  72 ) are,    wherein the insertion holes ( 22 ,  72 ) are placed in one row or in staggered arrangement in the fin ( 6 ,  73 ), and    wherein when an inside diameter of the insertion holes ( 22 ,  72 ) is set as D [mm], a distance between a center of the insertion hole ( 22 ,  72 ) nearest to the first rib ( 15 ,  75 ) and the outer edge ( 25 ,  77 ) is set as L [mm], a distance between a center of the first rib ( 15 ,  75 ) and the outer edge ( 25 ,  77 ) is set as La [mm], a width of the first rib ( 15 ,.  75 ) is set as LL 1  [mm], a thickness of the fin ( 6 ,  73 ) is set as t [mm], a height of the first rib ( 15 ,  75 ) is set as h 1  [mm], and a minimum value of distance between the insertion holes ( 22 ,  72 ) adjacent to each other is set as P [mm], then      0.4 <La <( L−D/ 2−0.5),  0.15<LL1<0.5,  0.05<t<0.15,  0.5t<h1<2.5t,  D<7.5,  P>15, and    D/P< 0.5.    
   
   
       2 . The heat exchanger according to  claim 1 , wherein 
 the insertion holes ( 72 ) are placed in staggered arrangement in the fin ( 73 ),    the insertion holes ( 72 ) placed on one side of the fin is generally parallel to the outer edge ( 77 ),    a second rib ( 76 ) extending generally parallel to the outer edge ( 77 ) is formed on the fin ( 73 ) between the insertion holes ( 72 ) which are adjacent to each other in a direction generally perpendicular to a direction in which the outer edge ( 77 ) extends, and    when a width of the second rib ( 76 ) is set as LL 2  [mm] and a height of the second rib ( 76 ) is set as h 2  [mm], then      0.15<LL2<0.5, and  0.5t<h2<2.5t.