Heat exchanger and air-conditioning apparatus

Abstract

A heat exchanger, including plural flat tubes arranged in a right-and-left direction orthogonal to a front-and-back airflow direction of the heat exchanger, a corrugated fin sandwiched by adjacent of the flat tubes and thermally connected thereto at each of apexes of the corrugated fin, an inlet header connected to one end of each of the flat tubes, and an outlet header connected to the other end of each of the flat tubes, the flat tubes extending along an up-and-down direction of the heat exchanger. The corrugated fin includes a protruding portion protruding to a front side with respect to a front-side end portion of each of the flat tubes, the protruding portion including a first lug portion oriented obliquely to the front-and-back direction, a second lug portion being formed in the right-and-left direction at a part sandwiched by the adjacent of the flat tubes.

1 . A heat exchanger, comprising:
 a plurality of flat tubes arranged in a right-and-left direction orthogonal to a front-and-back direction, the front-and-back direction being an airflow direction of the heat exchanger;   a corrugated fin sandwiched by adjacent ones of the plurality of flat tubes and thermally connected to the adjacent ones of the plurality of flat tubes at each of apexes of the corrugated fin;   an inlet header connected to one end of each of the plurality of flat tubes; and   an outlet header connected to an other end of each of the plurality of flat tubes,   the plurality of flat tubes extending along an up-and-down direction of the heat exchanger,   the corrugated fin including a protruding portion protruding to a front side with respect to a front-side end portion of each of the plurality of flat tubes,   the protruding portion including a plurality of first lug portions oriented obliquely to the front-and-back direction, the plurality of first lug portions being positioned on right and left sides of the protruding portion,   the corrugated fin further including a second lug portion formed in the right-and-left direction at a part sandwiched by the adjacent ones of the plurality of flat tubes,   between the plurality of first lug portions positioned on the right and left sides, an interval is secured,   the plurality of first lug portions each including a slit formed in the protruding portion,   one or more of the plurality of first lug portions formed in a radial direction extending from one of the plurality of flat tubes toward a center portion of a front-side end portion of the protruding portion,   the heat exchanger further including a passage for water flowing through the slit.   
     
     
         2 . (canceled) 
     
     
         3 . The heat exchanger of  claim 1 , wherein the plurality of first lug portions are formed in the radial direction extending from each of the plurality of flat tubes toward the center portion of the front-side end portion of the protruding portion, the plurality of first lug portions being positioned on the right and left sides of the protruding portion. 
     
     
         4 . The heat exchanger of  claim 1 , wherein all of the plurality of first lug portions are oriented obliquely in the same direction with respect to the front-and-back direction. 
     
     
         5 . The heat exchanger of  claim 4 , wherein the plurality of first lug portions are formed to be inclined in an inclination direction of each of surfaces of the corrugated fin from the front side to a back side. 
     
     
         6 . The heat exchanger of  claim 1 , wherein the plurality of flat tubes are provided in two rows in the front-and-back direction. 
     
     
         7 . The heat exchanger of  claim 1 , wherein a thickness of a center portion of the corrugated fin in the right-and-left direction is formed larger than thicknesses of other portions of the corrugated fin. 
     
     
         8 . The heat exchanger of  claim 1 , wherein each of the plurality of first lug portions is formed by forming the one slit in the protruding portion. 
     
     
         9 . An air-conditioning apparatus, comprising:
 the heat exchanger of  claim 1 ; and   a fan configured to send air to the heat exchanger;   the heat exchanger including the protruding portion arranged on a windward side of the heat exchanger.