Electric fan

摘要

This electric fan has a rotation shaft that is provided rotatably with respect to a 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, and a bracket that fixes the stator to a fan shroud and is formed so as to cover a rear surface of the stator, with a fan body provided so as to integrally rotate with the rotation shaft and the rotor yoke. The fan body has a fan boss formed in a bottomed cylindrical shape so as to cover the rotor yoke from a front surface, and a plurality of blades that is provided protruding radially from an outer circumferential surface of the fan boss. A first labyrinth portion is provided between an opening portion of the fan boss and the fan shroud.

主权项

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:
a base portion to which the bracket is attached; anda cylindrical first infiltration prevention wall formed at an outer circumferential portion of the base portion so as to rise toward the fan body, and that covers the opening portion of the fan boss from an outer side in the radial direction, 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.