Heat exchanger and air conditioner

Abstract

A heat exchanger includes flat tubes and fins. The plate-like fins are spaced from one another by a predetermined distance in the direction in which the flat tubes extend. The flat tubes are inserted in pipe insertion portions of the fins. In the fins, parts of the fins between vertically adjacent ones of the flat tubes are heat transfer parts. Each of the heat transfer parts includes protrusions and louvers. The protrusions are located at a windward region of the heat transfer part and formed by making the heat transfer part protrude in an inverted V shape. The louvers are located in a leeward region of the heat transfer part and bend out from the heat transfer part.

1 . A heat exchanger, comprising:
 vertically arranged flat tubes including a fluid passage therein; and   fins each dividing a space between adjacent ones of the flat tubes into a plurality of air passages through which air flows, wherein   each of the fins includes heat transfer parts each having a plate shape extending from an adjacent one of the flat tubes to the other adjacent flat tube, the heat transfer parts forming side walls of the air passages,   each of the heat transfer parts of the fins includes louvers that bend out from the heat transfer part, and protrusions located at a windward side of the louvers, formed by making the heat transfer part protrude, and extending in a direction intersecting with an air passage direction.   
     
     
         2 . The heat exchanger of  claim 1 , wherein
 at least a louver that is included in the louvers provided on each of the heat transfer parts of the fins and is located near the protrusions has a leeward bent-out end projecting in a direction in which the protrusions protrude.   
     
     
         3 . The heat exchanger of  claim 1 , wherein
 a bent-out end of each of the louvers includes a main edge, an upper edge extending from an upper end of the main edge to an upper end of the louver and tilted relative to the main edge, and a lower edge extending from a lower end of the main edge to a lower end of the louver and tilted relative to the main edge, and   at least one of the louvers provided on each of the heat transfer parts of the fins is an asymmetric louver in which a tilt angle of the lower edge relative to the main edge is smaller than a tilt angle of the upper edge relative to the main edge.   
     
     
         4 . The heat exchanger of  claim 3 , wherein
 in each of the heat transfer parts of the fins, at least one of the louvers located in a region adjacent to the flat tubes is the asymmetric louver.   
     
     
         5 . The heat exchanger of  claim 1 , wherein
 each of the heat transfer parts of the fins includes a leeward end portion located at a leeward side of the flat tubes, and   at least one louver of the louvers is located on the leeward end portion of each of the heat transfer parts of the fins.   
     
     
         6 . The heat exchanger of  claim 1 , wherein
 the protrusions are arranged side by side in an air passage direction in each of the heat transfer parts of the fins.   
     
     
         7 . The heat exchanger of  claim 6 , wherein
 among the protrusions of each of the heat transfer parts of the fins, the protrusion closest to a windward side of the heat transfer part has a largest width in the air passage direction.   
     
     
         8 . The heat exchanger of  claim 6 , wherein
 among the protrusions of each of the heat transfer parts of the fins, the protrusion closest to a windward side of the heat transfer part has a smallest height in a direction in which the protrusions protrude.   
     
     
         9 . The heat exchanger of  claim 6 , wherein
 in each of the heat transfer parts of the fins, the protrusions are located in a region from a windward edge of the heat transfer part to a portion at a leeward side of a middle, in the air passage direction, of the heat transfer part.   
     
     
         10 . The heat exchanger of  claim 6 , wherein
 each of the heat transfer parts of the fins includes a windward end portion located windward of the flat tubes, and   in each of the heat transfer parts of the fins, the protrusions are located in a region including the windward end portion and a portion adjacent to a leeward side of the windward end portion.   
     
     
         11 . The heat exchanger of  claim 6 , wherein
 in each of the heat transfer parts of the fins, vertical positions of lower ends of the protrusions become lower toward a leeward side of the heat transfer part.   
     
     
         12 . The heat exchanger of  claim 1 , wherein
 the fins each have a plate shape with notches into which the flat tubes are inserted, are arranged to be spaced from one another by a predetermined distance in a direction in which the flat tubes extend, and sandwich the flat tubes at edges of the notches, and   parts of the fins between vertically adjacent ones of the notches are the heat transfer parts.   
     
     
         13 . The heat exchanger of  claim 1 , wherein
 each of the fins is a corrugated fin that bends up and down and is located between adjacent ones of the flat tubes, includes the heat transfer parts arranged in a direction in which the flat tubes extend, and also includes intermediate plate parts continuous to upper or lower ends of adjacent ones of the heat transfer parts and joined to the flat tubes.   
     
     
         14 . An air conditioner, comprising:
 a refrigerant circuit including the heat exchanger of  claim 1 , wherein   the refrigerant circuit circulates refrigerant therein, thereby performing a refrigeration cycle.   
     
     
         15 . The heat exchanger of  claim 2 , wherein
 a bent-out end of each of the louvers includes a main edge, an upper edge extending from an upper end of the main edge to an upper end of the louver and tilted relative to the main edge, and a lower edge extending from a lower end of the main edge to a lower end of the louver and tilted relative to the main edge, and   at least one of the louvers provided on each of the heat transfer parts of the fins is an asymmetric louver in which a tilt angle of the lower edge relative to the main edge is smaller than a tilt angle of the upper edge relative to the main edge.   
     
     
         16 . The heat exchanger of  claim 15 , wherein
 in each of the heat transfer parts of the fins, at least one of the louvers located in a region adjacent to the flat tubes is the asymmetric louver.   
     
     
         17 . The heat exchanger of  claim 7 , wherein
 among the protrusions of each of the heat transfer parts of the fins, the protrusion closest to a windward side of the heat transfer part has a smallest height in a direction in which the protrusions protrude.