US 6,981,843 B2
Axial-flow fan structure
Yung-yu Chiu, Taichung (Taiwan); Shun-chen Chang, Taipei (Taiwan); and Kuo-cheng Lin, Taoyuan (Taiwan)
Assigned to Delta Electronics, Inc., Taoyuan (Taiwan)
Filed on Dec. 23, 2003, as Appl. No. 10/744,376.
Claims priority of application No. 92208175 U (TW), filed on May 05, 2003.
Prior Publication US 2004/0223848 A1, Nov. 11, 2004
Int. Cl. F04D 29/24 (2006.01); F04D 29/44 (2006.01)
U.S. Cl. 415—220 23 Claims
OG exemplary drawing
 
1. An axial-flow fan structure, comprising:
a hub having a top surface and a side surface; and
a plurality of blades, each of the blades having a top portion, an edge portion and a fastening portion, wherein:
the fastening portion of each of the blades is fastened to the side surface of the hub such that the blades are connected to the hub;
a lateral air intake region is formed above the top surface of the hub;
a lateral air intake surface around the lateral air intake region is constituted by the edge portions of all of the blades and utilized for guiding air within the lateral air intake region sideways; and
a frontal air intake region is formed above the top portions of the blades.