Patent ID: 9249788
Filing Date: 2016-02-02
CPC Classification: F04B,F04D,H02K

Claim Text:
1. An electric fan comprising: an electric motor; a fan body that is attached to the electric motor; and a fan shroud that is configured to fix the electric motor, wherein the electric motor comprises: a stator on which coils are wound; a rotation shaft provided in a center of the stator in a radial direction, and that is provided rotatably with respect to the stator; a rotor yoke provided on the rotation shaft and formed in a bottomed cylindrical shape so as to cover the stator from a front surface of the stator; and a bracket being formed so as to cover a rear surface of the stator and that fixes the stator to the fan shroud, wherein the fan body is provided so as to integrally rotate with the rotation shaft and the rotor yoke, wherein the fan body comprises: a fan boss formed in a bottomed cylindrical shape so as to cover a front surface of the rotor yoke; a plurality of blades that protrude outward in the radial direction from an outer circumferential surface of the fan boss, wherein a first labyrinth portion is provided between an opening portion of the fan boss and the fan shroud, wherein the fan shroud comprises: wherein a circumferential wall of the fan boss and the first infiltration prevention wall are formed so as to overlap each other in the radial direction, and wherein the first labyrinth portion is formed by the circumferential wall of the fan boss and the first infiltration prevention wall.