US 11,864,343 B2
Heat dissipation fan
Rui Song, Beijing (CN)
Assigned to LENOVO (BEIJING) LIMITED, Beijing (CN)
Filed by Lenovo (Beijing) Limited, Beijing (CN)
Filed on Feb. 27, 2023, as Appl. No. 18/175,070.
Claims priority of application No. 202210206165.9 (CN), filed on Feb. 28, 2022.
Prior Publication US 2023/0276597 A1, Aug. 31, 2023
Int. Cl. F04D 29/30 (2006.01); H05K 7/20 (2006.01); F04D 29/32 (2006.01); F04D 29/54 (2006.01); G06F 1/20 (2006.01)
CPC H05K 7/20172 (2013.01) [F04D 29/325 (2013.01); F04D 29/541 (2013.01); G06F 1/203 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A heat dissipation fan, comprising:
a body including a fan air inlet surface, a central shaft driving surface located inside the fan air inlet surface, and a plurality of protrusion structures configured at spacings in a circumference direction of the central shaft driving surface; and
fan blades including first fan blades connected between the central shaft driving surface and the fan air inlet surface, and second fan blades connected between the protrusion structure and the fan air inlet surface;
wherein a fan air inlet angle is formed between each fan blade and the central shaft driving surface, and the plurality of protrusion structures are configured to vary the fan air inlet angle to control a flow field of an airflow entering the fan air inlet angle.
 
9. A method of determining a position of a fan blade in a heat dissipation fan, the heat dissipation fan including a body including a fan air inlet surface, a central shaft driving surface located inside the fan air inlet surface, and a plurality of protrusion structures configured at spacings in a circumference direction of the central shaft driving surface, and fan blades including first fan blades connected between the central shaft driving surface and the fan air inlet surface, and second fan blades connected between the protrusion structure and the fan air inlet surface, and the method comprising:
determining a first fan air inlet angle and a quantity of the plurality of protrusion structures, the first fan air inlet angle formed between each first fan blade and the central shaft driving surface being identical for all the first fan blades;
identifying the first fan air inlet angle to be a second fan air inlet angle corresponding to an initial second fan blade, the initial second fan blade being adjacent to one of the first fan blades;
determining a third fan air inlet angle corresponding to each second fan blade based on a connection sequence of the second fan blades on each of the plurality of protrusion structures, the second fan air inlet angle, and the quantity of the plurality of protrusion structures, the third fan air inlet angle varying for different second fan blades; and
determining the position of each first fan blade based on the first fan air inlet angle and the position of each second fan blade based on the third fan air inlet angle.