US 11,719,106 B2
Fan
Ching-Hsien Yeh, Taoyuan (TW); and Chih-Wei Chan, Taoyuan (TW)
Assigned to DELTA ELECTRONICS, INC., Taoyuan (TW)
Filed by Delta Electronics, Inc., Taoyuan (TW)
Filed on Aug. 4, 2022, as Appl. No. 17/881,504.
Application 17/881,504 is a division of application No. 16/734,204, filed on Jan. 3, 2020, granted, now 11,441,433.
Claims priority of application No. 201910391631.3 (CN), filed on May 10, 2019.
Prior Publication US 2022/0372883 A1, Nov. 24, 2022
Int. Cl. F04D 29/32 (2006.01); F01D 5/30 (2006.01)
CPC F01D 5/3061 (2013.01) [F04D 29/325 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A fan, comprising:
a hub having an axle center, an annular sidewall surrounding the axle center, and an annular protrusion portion extended from the annular sidewall; and
a plurality of fan blades disposed around the hub, wherein each of the fan blades has a bent portion, and the bent portions of the fan blades are extended along a surrounding direction surrounding the axle center,
wherein each of the fan blades further has a blade portion, each of the bent portions of the respective fan blades is two positioning sheets opposite to and parallel with each other and is formed by bending a part of the blade portion of each of the fan blades, and the two positioning sheets are perpendicular to the blade portion and connected with the annular protrusion portion from two sides of the annular protrusion portion, and the hub is welded with the bent portion of each of the fan blades along the surrounding direction.