IP Library › Granted Patent US 7,845,917
Granted Patent B2
US 7,845,917 · App. 11/577,549 · Granted Dec 7, 2010

Electric blower

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Quick Facts
Patent No.
US 7,845,917
App. No.
11/577,549
Granted
Dec 7, 2010
Kind
B2
Abstract

An electric blower includes a motor having a stator on which field windings are wound, a rotor facing the stator, and a bracket covering the stator and the rotor. The electric blower further includes a fan mounted to a shaft coupled to the rotor, and an air guide having a diffuser provided to the outer circumference of the fan and formed of a plurality of stationary blades adjacent to each other. The electric blower still includes a fan case having openings at its outer circumference for discharging a part of the air having passed the diffuser to the outside, and protrusions having a brim for covering a part of the openings. The foregoing structure allows the air blower to cool the motor with airflow generated by the fan.

Claims (17)

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.

2. The electric blower of claim 1 , wherein the first portion of the opening covered by the brim is not less than 30% of the entire area of the opening in the radial direction of the fan.

3. 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, the opening having a length in the circumferential direction of the fan; and

a protrusion having a brim, an axial length of the brim being tapered along the entire circumferential length of the opening,

wherein the air blower cools the motor with airflow generated by the fan.