Patent ID: 8485781
Filing Date: 2013-07-16
Classification: F04D

Abstract:
1. An axial flow fan comprising: an impeller including a plurality of rotor vanes and rotatable about a central axis; a motor portion arranged to rotatingly drive the impeller; a base portion arranged to support the motor; a housing including an intake vent, an exhaust vent, and an inner peripheral surface surrounding the impeller and the motor portion; and a plurality of stator vanes arranged to respectively connect the base portion and the housing; wherein the inner peripheral surface includes a first inner peripheral surface arranged such that a distance between the central axis and the first inner peripheral surface increases toward the intake vent and the exhaust vent in an axial direction; among the plurality of stator vanes, a first stator vane is arranged to respectively connect the base portion and the first inner peripheral surface, the first stator vane including a first outer edge, a second outer edge, and a third outer edge; the first outer edge is arranged to face the first inner peripheral surface with a recess interposed therebetween; the second outer edge and the third outer edge, both of which are perpendicular or substantially perpendicular to the central axis, are connected with the first outer edge; a connecting point of the first outer edge and the second outer edge is arranged radially outside an outermost edge of the impeller; and the first outer edge and the second outer edge are arranged to define an obtuse angle.