Patent ID: 7845917
Filing Date: 2010-12-07
Classification: A47L,F04D

Abstract:
1. An electric blower comprising: a motor including a stator on which a field winding is wound, a rotor facing the stator, and a bracket covering the stator and the rotor; a fan mounted to a shaft coupled to the rotor; an air guide including a diffuser provided to an outer circumference of the fan and formed of a plurality of stationary blades adjacent to each other; a fan case for covering the fan and including an opening at an outer circumference thereof for discharging a part of air having passed the diffuser to outside of the fan case; and a protrusion having a brim for covering a first portion of the opening, a second portion of the opening uncovered by the brim, wherein the first portion of the opening is not greater than 75% of an entire area of the opening in a radial direction of the fan, wherein an axial length of the brim tapers from a first circumferential end of the opening all the way to a second circumferential end of the opening, and wherein the air blower cools the motor with airflow generated by the fan.