US 11,867,188 B2
Fan
Shun-Chen Chang, Taoyuan (TW); and Chao-Fu Yang, Taoyuan (TW)
Assigned to DELTA ELECTRONICS, INC., Taoyuan (TW)
Filed by DELTA ELECTRONICS, INC., Taoyuan (TW)
Filed on Jun. 28, 2018, as Appl. No. 16/022,192.
Claims priority of application No. 201710943492.1 (CN), filed on Oct. 11, 2017.
Prior Publication US 2019/0107112 A1, Apr. 11, 2019
Int. Cl. F04D 25/06 (2006.01); F04D 19/02 (2006.01); G06F 1/20 (2006.01); H02K 7/14 (2006.01); F04D 25/08 (2006.01); F04D 17/06 (2006.01); H05K 7/20 (2006.01); F04D 29/42 (2006.01); F04D 29/44 (2006.01)
CPC F04D 25/0606 (2013.01) [F04D 17/06 (2013.01); F04D 19/02 (2013.01); F04D 25/08 (2013.01); F04D 29/4226 (2013.01); F04D 29/441 (2013.01); G06F 1/20 (2013.01); H02K 7/14 (2013.01); H05K 7/20172 (2013.01); H05K 7/20136 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A fan comprising:
a fan frame comprising a base, a frame shell and a plurality of static blades, wherein the plurality of static blades are arranged on a periphery of the base and connected between the base and the frame shell, the frame shell has an inlet opening, the inlet opening has a bell mouth shape; and
a driving device disposed on the base and comprising:
a stator structure comprising a stator magnetic pole group, a bushing and an upper shell, 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, the upper shell is disposed corresponding to the base; and
a rotor structure disposed corresponding to the stator structure and comprising:
at least a bearing disposed in the bushing,
a shaft disposed through the bearing,
a rotor shell connected with the shaft,
a magnetic structure disposed corresponding to the stator magnetic pole group, wherein the stator magnetic pole group magnetically drives the magnetic structure to rotate the shaft and the rotor shell, and
a plurality of blades arranged on a periphery of the rotor shell, wherein the plurality of blades arranged on the periphery of the rotor shell are disposed corresponding to the frame shell;
wherein two ends of the frame shell adjacent to the plurality of blades arranged on the periphery of the rotor shell are configured with a first turning portion and a second turning portion, respectively, and the first turning portion and the second turning portion are disposed between parts of the frame shell with different curvatures, 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 upper shell has a positioning portion corresponding to a positioning portion of the base, the positioning portion of the upper shell and the positioning portion of the base directly contact the stator magnetic pole group, and the stator magnetic pole group is limited between the positioning portions,
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.