Fan

摘要

A blower fan according to a preferred embodiment of the present invention is a centrifugal fan. At least a portion of each of a plurality of blades of an impeller portion is arranged above a stator. A lower plate portion is arranged to define an air channel portion and an air outlet arranged on a lateral side of the impeller portion when a side wall portion arranged to surround an outer circumference of the impeller portion and an upper plate portion arranged above the impeller portion are present. The air channel portion is arranged to extend in a circumferential direction between an outer circumference of the stator and the side wall portion. At least a portion of a circuit board is arranged in the air channel portion and on the lower plate portion. A plurality of lead wires extending from the stator are connected to the circuit board in the air channel portion.

主权项

1. A blower fan comprising:
a stationary portion; a bearing mechanism; and a rotating portion supported by the bearing mechanism to be rotatable about a central axis extending in a vertical direction with respect to the stationary portion; wherein the stationary portion includes:
a lower plate portion arranged to extend in directions away from the central axis;an annular stator arranged on the lower plate portion; anda circuit board; the rotating portion includes:
an annular rotor magnet arranged radially inside the stator;a rotor hub portion to which the rotor magnet is directly fixed or indirectly fixed with another member intervening therebetween; andan impeller portion fixed to the rotor hub portion; the impeller portion includes a plurality of blades arranged in a circumferential direction; at least a portion of each of the blades is arranged above the stator; when a side wall portion arranged to surround an outer circumference of the impeller portion and an upper plate portion arranged above the impeller portion are present, the lower plate portion is arranged to define an air channel portion in which an air is caused by the impeller portion to flow in the circumferential direction and an air outlet arranged on a lateral side of the impeller portion together with the side wall portion and the upper plate portion; at least one of the upper plate portion and the lower plate portion includes an air inlet; the air channel portion is a space which is located between an outer circumference of the stator and the side wall portion, extends in the circumferential direction, and reaches an upper surface of the lower plate portion at an axially lower end; at least a portion of the circuit board is arranged in the air channel portion and on the lower plate portion; and a plurality of lead wires extending from the stator are connected to the circuit board in the air channel portion.