Fin for heat exchanger and heat exchanger using the fin

Abstract

The present invention discloses a fin for a heat exchanger, the fin is formed with louvers, and air, which is used as heat exchange medium, successively flows through said louvers when the heat exchanger operates. The louver gap of the louvers changes in the air flow direction, such that a louver gap at a certain portion of the louvers matches with an amount of frost formed at that portion. With the technical solution of the invention, the louver gap at a certain portion of the louvers is made to match with the amount of frost formed at that portion, such that a sufficient space is still left between adjacent louvers for the air to flow through. As a result, the wind resistance will not increase substantially to decrease the amount of air flowing through, and thus the heat exchange performance of the fin can be utilized completely.

1 . A fin for a heat exchanger, said fin being formed with louvers, and air, which is used as a heat exchange medium, successively flowing through said louvers when the heat exchanger operates,
 wherein the louver gap of the louvers changes in the air flow direction, such that a louver gap at a certain portion of the louvers matches with an amount of frost formed at said portion.   
     
     
         2 . The fin as claimed in  claim 1 , wherein a louver gap located upstream in the air flow direction is larger than or equal to an adjacent downstream louver gap, and at least one or more of the louver gaps is/are larger than the adjacent downstream louver gap. 
     
     
         3 . The fin as claimed in  claim 2 , wherein the louver gap of said louvers decreases continuously in the air flow direction. 
     
     
         4 . The fin as claimed in  claim 3 , wherein said louvers have a constant tilt angle, and the pitch of the louvers decreases continuously in the air flow direction. 
     
     
         5 . The fin as claimed in  claim 3 , wherein said louvers have a constant pitch, and the tilt angle of the louvers decreases continuously in the air flow direction. 
     
     
         6 . The fin as claimed in  claim 2 , wherein said louvers are divided into a number of sets in the air flow direction, each set of louvers has a constant louver gap, the louver gap of a set which is located upstream in the air flow direction is larger than the louver gap of an adjacent downstream set. 
     
     
         7 . The fin as claimed in  claim 6 , wherein said sets have a uniform tilt angle, and the pitch of a set which is located upstream in the air flow direction is larger than the pitch of an adjacent downstream set. 
     
     
         8 . The fin as claimed in  claim 6 , wherein said sets have a uniform pitch, and the tilt angle of a set which is located upstream in the air flow direction is larger than the tilt angle of an adjacent downstream set. 
     
     
         9 . The fin as claimed in  claim 6 , wherein said louvers are divided into a leading set which is located upstream and a trailing set which is located downstream in the air flow direction. 
     
     
         10 . A heat exchanger comprising:
 a fin being formed with louvers whereby a heat exchange medium successfully flows through said louvers during operation of the heat exchanger;   wherein the louver gap of the louvers changes in the flow direction of the heat exchange medium, such that a louver gap at a certain portion of the louvers matches with an amount of frost formed at said portion.   
     
     
         11 . The heat exchanger as claimed in  claim 10 , wherein said heat exchanger is a microchannel heat exchanger. 
     
     
         12 . The heat exchanger as claimed in  claim 10 , wherein the louver gap located upstream in the air flow direction is larger than or equal to an adjacent downstream louver gap, and at least one or more of the louver gaps is/are larger than the adjacent downstream louver gap. 
     
     
         13 . The heat exchanger as claimed in  claim 12 , wherein the louver gap of said louvers decreases continuously in the air flow direction. 
     
     
         14 . The heat exchanger as claimed in  claim 13 , wherein said louvers have a constant tilt angle, and the pitch of the louvers decreases continuously in the air flow direction. 
     
     
         15 . The heat exchanger as claimed in  claim 13 , wherein said louvers have a constant pitch, and the tilt angle of the louvers decreases continuously in the air flow direction. 
     
     
         16 . The heat exchanger as claimed in  claim 12 , wherein said louvers are divided into a number of sets in the air flow direction, each set of louvers has a constant louver gap, the louver gap of a set which is located upstream in the air flow direction is larger than the louver gap of an adjacent downstream set. 
     
     
         17 . The heat exchanger as claimed in  claim 16 , wherein said sets have a uniform tilt angle, and the pitch of a set which is located upstream in the air flow direction is larger than the pitch of an adjacent downstream set. 
     
     
         18 . The heat exchanger as claimed in  claim 16 , wherein said sets have a uniform pitch, and the tilt angle of a set which is located upstream in the air flow direction is larger than the tilt angle of an adjacent downstream set. 
     
     
         19 . The heat exchanger as claimed in  claim 16 , wherein said louvers are divided into a leading set which is located upstream and a trailing set which is located downstream in the air flow direction.