HEAT EXCHANGER

Disclosed is a heat exchanger, comprising a first collecting pipe (1), a second collecting pipe (2) and a plurality of flat pipes (3). Both ends of each flat pipe (3) are respectively connected to the first collecting pipe (1) and the second collecting pipe (2), and the flat pipes are arranged apart from each other. Fins (4) are arranged between every two adjacent flat pipes (3). The heat exchanger is provided with a bent segment (S) and a straight segment (T) which is adjacent to the bent segment (S), the fins (4) in the straight segment (T) are first fins (41), the fins (4) in the bent segment are divided into second fins (42) and third fins (43), the width of the second fins (42) is greater than that of the third fins (43), and the second fins (42) and the third fins (43) are arranged alternately in an axial direction. After the heat exchanger is bent, the fins (4) cannot be split at the bent outer side thereof and have a small compressive deformation at the bent inner side thereof, thereby reducing the loss of the heat exchange performance and effectively avoiding the split and extrusion deformation which are generated between the fins (4) and the flat pipes (3) when the heat exchanger is bent, and therefore, the heat exchange effect is improved; and there is no loss of air volume, and the wind resistance is increased, thereby improving the performance.