Patent ID: 11867188
Assignee: DELTA ELECTRONICS, INC.
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F  G  H | IPC F  G  H

Claim 16:
17. A fan, comprising:
a fan frame comprising a base, a frame shell and a plurality of static blades, wherein the base comprises a first positioning portion, the frame shell comprises two sub frame shells which are engaged with each other, the frame shell has an inlet opening, the inlet opening has a bell mouth shape, the plurality of static blades are connected between the base and one of the two sub frame shells;
a driving device disposed on the base and comprising:
a stator structure comprising a stator magnetic pole group, a bushing and an upper shell having at least a second positioning portion, wherein the stator magnetic pole group is disposed on the base, at least a part of the bushing is protruded beyond the stator magnetic pole group, and the upper shell is disposed corresponding to the base, the first positioning portion and the second positioning portion directly contact the stator magnetic pole group, the stator magnetic pole group is limited between the first positioning portion and the second positioning portion; and
a rotor structure disposed corresponding to the stator structure and comprising:
a first bearing and a second bearing disposed in the bushing,
a shaft disposed through the first bearing and the second bearing,
a rotor shell connected with the shaft,
a magnetic structure disposed corresponding to the stator magnetic pole group to rotate the shaft and the rotor shell, and
a plurality of blades arranged on a periphery of the rotor shell;

wherein two ends of the frame shell adjacent to the plurality of blades are configured with a first turning portion and a second turning portion, respectively, a curvature of the first turning portion is larger than a curvature of the second turning portion, the first turning portion is higher than the second turning portion in an axial direction, the second turning portion of the frame shell is higher than a lowest portion of the periphery of the rotor shell in the axial direction,
wherein the base has an upper end and a lower end, the upper end of the base is configured with the plurality of static blades, the lower end of the base is configured without the plurality of static blades, the lower end of the base is formed with a radial shrinking structure toward a direction away from the plurality of static blades.