Heat exchanger and air conditioner

Abstract

A plurality of flat tubes is, at one end thereof, connected to a first header collecting pipe, and is, at the other end thereof, connected to a second header collecting pipe. Some of the flat tubes forms a main heat exchange part, and the other flat tubes forms an auxiliary heat exchange part. The number of flat tubes of the auxiliary heat exchange part is less than the number of flat tubes of the main heat exchange part. The total cross-sectional area of flow paths per flat tube provided in the auxiliary heat exchange part is greater than the total cross-sectional area of flow paths per flat tube provided in the main heat exchange part.

1 - 6 . (canceled) 
     
     
         7 . A heat exchanger including
 a plurality of flat tubes arranged in a vertical direction and each formed with a plurality of flow paths of fluid, and   a plurality of fins configured to divide part between adjacent ones of the flat tubes into a plurality of air passages through each of which air flows, comprising:   a first header collecting pipe; and   a second header collecting pipe,   wherein each flat tube is, at one end thereof, connected to the first header collecting pipe, and is, at the other end thereof, connected to the second header collecting pipe,   some of the flat tubes form a main heat exchange part, and the other flat tubes form an auxiliary heat exchange part,   the flat tubes forming the auxiliary heat exchange part are fewer than the flat tubes forming the main heat exchange part,   a total cross-sectional area of the flow paths per flat tube in the auxiliary heat exchange part is greater than a total cross-sectional area of the flow paths per flat tube in the main heat exchange part, and   if the heat exchanger serves as a condenser, refrigerant is condensed in the main heat exchange part, and the refrigerant is sub-cooled in the auxiliary heat exchange part.   
     
     
         8 . The heat exchanger of  claim 7 , wherein
 a width (W 2 ) of each flat tube of the auxiliary heat exchange part is greater than a width (W 1 ) of each flat tube of the main heat exchange part, and   the flow paths per flat tube in the auxiliary heat exchange part is more than the flow paths per flat tube in the main heat exchange part.   
     
     
         9 . The heat exchanger of  claim 7 , wherein
 each flow path is formed with a plurality of grooves in a corresponding one of the flat tubes of the main heat exchange part, and   each flat tube of the auxiliary heat exchange part is a bare pipe.   
     
     
         10 . The heat exchanger of  claim 7 , wherein
 each fin is formed in such a plate shape that a plurality of cut parts into each of which a corresponding one of the flat tubes is inserted are provided,   the fins are arranged at predetermined intervals in an extension direction of the flat tubes,   each flat tube is sandwiched between peripheral edge parts of a corresponding one of the cut parts of the fins, and   in each fin, part between adjacent ones of the cut parts arranged in the vertical direction forms a heat transfer part.   
     
     
         11 . The heat exchanger of  claim 10 , wherein
 an end of each flat tube in a width direction thereof is aligned with an end of a corresponding one of the cut parts on an open side thereof.   
     
     
         12 . An air conditioner, comprising:
 a refrigerant circuit provided with the heat exchanger of  claim 7 ,   wherein refrigerant circulates to perform a refrigeration cycle in the refrigerant circuit.   
     
     
         13 . The heat exchanger of  claim 8 , wherein
 each flow path is formed with a plurality of grooves in a corresponding one of the flat tubes of the main heat exchange part, and   each flat tube of the auxiliary heat exchange part is a bare pipe.   
     
     
         14 . The heat exchanger of  claim 8 , wherein
 each fin is formed in such a plate shape that a plurality of cut parts into each of which a corresponding one of the flat tubes is inserted are provided,   the fins are arranged at predetermined intervals in an extension direction of the flat tubes,   each flat tube is sandwiched between peripheral edge parts of a corresponding one of the cut parts of the fins, and   in each fin, part between adjacent ones of the cut parts arranged in the vertical direction forms a heat transfer part.   
     
     
         15 . The heat exchanger of  claim 9 , wherein
 each fin is formed in such a plate shape that a plurality of cut parts into each of which a corresponding one of the flat tubes is inserted are provided,   the fins are arranged at predetermined intervals in an extension direction of the flat tubes,   each flat tube is sandwiched between peripheral edge parts of a corresponding one of the cut parts of the fins, and   in each fin, part between adjacent ones of the cut parts arranged in the vertical direction forms a heat transfer part.   
     
     
         16 . The heat exchanger of  claim 13 , wherein
 each fin is formed in such a plate shape that a plurality of cut parts into each of which a corresponding one of the flat tubes is inserted are provided,   the fins are arranged at predetermined intervals in an extension direction of the flat tubes,   each flat tube is sandwiched between peripheral edge parts of a corresponding one of the cut parts of the fins, and   in each fin, part between adjacent ones of the cut parts arranged in the vertical direction forms a heat transfer part.   
     
     
         17 . The heat exchanger of  claim 14 , wherein
 an end of each flat tube in a width direction thereof is aligned with an end of a corresponding one of the cut parts on an open side thereof.   
     
     
         18 . The heat exchanger of  claim 15 , wherein
 an end of each flat tube in a width direction thereof is aligned with an end of a corresponding one of the cut parts on an open side thereof.   
     
     
         19 . The heat exchanger of  claim 16 , wherein
 an end of each flat tube in a width direction thereof is aligned with an end of a corresponding one of the cut parts on an open side thereof.   
     
     
         20 . An air conditioner, comprising:
 a refrigerant circuit provided with the heat exchanger of  claim 8 ,   wherein refrigerant circulates to perform a refrigeration cycle in the refrigerant circuit.   
     
     
         21 . An air conditioner, comprising:
 a refrigerant circuit provided with the heat exchanger of  claim 9 ,   wherein refrigerant circulates to perform a refrigeration cycle in the refrigerant circuit.   
     
     
         22 . An air conditioner, comprising:
 a refrigerant circuit provided with the heat exchanger of  claim 10 ,   wherein refrigerant circulates to perform a refrigeration cycle in the refrigerant circuit.   
     
     
         23 . An air conditioner, comprising:
 a refrigerant circuit provided with the heat exchanger of  claim 11 ,   wherein refrigerant circulates to perform a refrigeration cycle in the refrigerant circuit.   
     
     
         24 . An air conditioner, comprising:
 a refrigerant circuit provided with the heat exchanger of  claim 13 ,   wherein refrigerant circulates to perform a refrigeration cycle in the refrigerant circuit.   
     
     
         25 . An air conditioner, comprising:
 a refrigerant circuit provided with the heat exchanger of  claim 14 ,   wherein refrigerant circulates to perform a refrigeration cycle in the refrigerant circuit.   
     
     
         26 . An air conditioner, comprising:
 a refrigerant circuit provided with the heat exchanger of  claim 15 ,   wherein refrigerant circulates to perform a refrigeration cycle in the refrigerant circuit.