Patent ID: 9109607
Filing Date: 2015-08-18
Classification: F04D

Abstract:
1. A blower fan comprising: a shaft; an impeller arranged to rotate about a rotation axis together with the shaft; and a motor arranged to rotate the impeller; and a housing configured to enclose outer circumferences of the impeller and the motor, the housing including a first housing and a second housing divided from each other in an axial direction to define a cylindrical chamber, each of the first housing and the second housing including radially inner surfaces which have substantially constant slopes defining the cylindrical chamber; wherein the impeller includes a substantially cylindrical impeller cup arranged to rotate together with the shaft, and a plurality of blades arranged on an outer circumferential surface of the impeller cup; the motor includes a substantially annular rotor magnet fixed to the shaft, a stator arranged opposite to the rotor magnet, and a substantially cylindrical stator support portion; the motor is arranged on an axially lower side of the impeller cup, and the stator of the motor is fixed to an inner circumferential surface of the stator support portion; an opening-side end portion of the impeller cup is arranged opposite to an upper surface of the stator support portion; the upper surface of the stator support portion includes an expanded portion defined at least in a portion thereof which is axially opposed to the opening-side end portion of the impeller cup, the expanded portion being located a greater distance from the opening-side end portion of the impeller cup than an axial distance between the opening-side end portion and a remaining portion of the upper surface of the stator support portion; the first housing is configured to support the stator support portion and a division position at which the first and second housings are divided from each other is arranged at an axial level lower than at least that of the opening-side end portion of the impeller cup; and the expanded portion of the upper surface of the stator support portion is positioned at a level axially above the stator.