Air fan including waterproof structure

摘要

An air fan capable of exhibiting an enhanced waterproof function while being simplified in structure. An end of an outer cylindrical wall of a motor support and that of a blade mounting wall are so formed that the end of the outer cylindrical wall is positioned outside the end of the blade mounting wall and a gap constituting a labyrinth structure is defined between both ends. The motor support also includes an inner cylindrical wall, which is fixedly mounted on an end thereof with a flange member including an annular flange extending outwardly in a radial direction. The inner cylindrical wall has a Length in an axial direction determined so that the annular flange is positioned in proximity to a suction port as compared with an outer opening of the gap.