Patent ID: 9074603
Filing Date: 2015-07-07
Classification: F04D,Y10T

Abstract:
1. A cooling fan comprising: a fan frame comprising a metal seat and a lateral wall, wherein the metal seat comprises an engaging face, a bottom face opposite to the engaging face and an engaging portion arranged on the engaging face, wherein the lateral wall is arranged on a periphery of the metal seat and defines an air inlet and an air outlet, wherein the metal seat comprises a wire-positioning hole on the engaging face; a circuit board comprising a periphery and a positioning hole, wherein the circuit board is press fit around the engaging portion of the metal seat via the positioning hole and adhered to the engaging face of the metal seat, wherein the circuit board comprises an insulation layer facing the metal seat; a stator-coil unit mounted on the metal seat of the fan frame and electrically connected to the circuit board; and an impeller rotatably coupled with the stator-coil unit, wherein a wire channel is formed on the bottom face and extends radially from the periphery of the metal seat to an edge of the wire-positioning hole, wherein the edge of the wire-positioning hole is located radially intermediate the peripheries of the circuit board and the metal seat, wherein the circuit board comprises a lead wire, wherein the lead wire has a first end electrically coupled to the circuit board, wherein the lead wire has a second end passing through the wire-positioning hole and extending radially along and in the wire channel for connection to an external power source or a driving circuit, and wherein the metal seat is located intermediate the impeller and the lead wire in the wire channel.