Fin and bending type heat exchanger having the fin

A bending type heat exchanger, comprising:

• a first header pipe and a second header pipe spaced apart from each other and having bending sections in one-to-one correspondence;
• a plurality of flat pipes, each of the plurality of flat pipes having two ends connected with the first header pipe and the second header pipe respectively;
• and
• a fin disposed between adjacent flat pipes and having a width smaller than or equal to a width of the flat pipes in a transverse direction, wherein the fin extends generally in a wavy shape along a longitudinal direction and comprises a main section and a connecting section, the main section and the connecting section are connected in series so as to make the connecting section form a wave crest and a wave trough, and the fin is divided into a first end portion, a second end portion, and a central portion between the first end portion and the second end portion along the transverse direction;
• wherein the connecting section of the central portion is connected with the flat pipes, and a gap exists between the connecting section of at least one of the first end portion and the second end portion and the flat pipes within the bending sections;
• wherein the connecting section of at least one of the first end portion and the second end portion and the connecting section of the central portion are cut apart each other through a longitudinal kerf, the connecting section of at least one of the first end portion and the second end portion is cut open through a transverse kerf so that the connecting section of at least one of the first end portion and the second end portion is divided into a first connecting portion and a second connecting portion, and the first connecting portion and the second connecting portion are bent in a direction away from the flat pipes and towards the main section of at least one of the first end portion and the second end portion.