Patent ID: 9169850
Filing Date: 2015-10-27
Classification: F04D,H02K

Abstract:
1. A fan, comprising: a fan frame; a motor disposed in the fan frame; an impeller connected with the motor and driven by the motor, and comprising: a hub including a first surface facing the motor and a second surface facing away from the motor; an inner blade disposed on the first surface; an outer blade disposed on the second surface; and a heat-guiding shell connected with the fan frame, wherein a surface of the heat-guiding shell has a first structure including concentric first protrusions; wherein the impeller is disposed around the heat-guiding shell and includes a second structure, wherein the second structure includes concentric second protrusions; and wherein the first protrusions are staggered with respect to the second protrusions in a radial direction and overlap with each of the second protrusions in an axial direction.