US 12,253,090 B2
Fan and cleaning device
Yuanjian Liang, Beijing (CN); Changcheng Li, Beijing (CN); and Zhimin Yang, Beijing (CN)
Assigned to BEIJING ROBOROCK TECHNOLOGY CO., LTD., Beijing (CN)
Appl. No. 18/262,488
Filed by Beijing Roborock Technology Co., Ltd., Beijing (CN)
PCT Filed Apr. 2, 2022, PCT No. PCT/CN2022/085083
§ 371(c)(1), (2) Date Jul. 21, 2023,
PCT Pub. No. WO2023/024521, PCT Pub. Date Mar. 2, 2023.
Claims priority of application No. 202110979782.8 (CN), filed on Aug. 25, 2021.
Prior Publication US 2024/0084811 A1, Mar. 14, 2024
Int. Cl. F04D 25/06 (2006.01); F04D 29/30 (2006.01); F04D 29/38 (2006.01); F04D 29/44 (2006.01)
CPC F04D 25/062 (2013.01) [F04D 29/30 (2013.01); F04D 29/384 (2013.01); F04D 29/444 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A fan, comprising:
a rotor;
a stator;
a first bearing assembly disposed at a radial outer side of an end of the rotor; and
an impeller comprising an impeller body, wherein the impeller body is provided with a receiving cavity for receiving the first bearing assembly; one end of the first bearing assembly is disposed in the receiving cavity; and the rotor, the first bearing assembly and the impeller body are disposed coaxially,
wherein the first bearing assembly comprises a first bearing and a second bearing closer to the stator than the first bearing, a shaft extension of the fan is smaller than a axial distance between the first bearing and the second bearing, and the shaft extension is a distance, along an axial direction of the fan, from a tail end of the rotor protruding out of the impeller to a center position of the first bearing,
wherein the fan further comprises an axial diffuser, the axial diffuser is disposed between the impeller and the stator along an axial direction of the rotor, and the other end of the first bearing assembly is disposed in a central hole of the axial diffuser.