US 12,480,469 B2
Methods and devices for independently pitching of wind turbine
Jigang Xia, Nanning (CN); Xuekong Li, Nanning (CN); Chunliang Huang, Nanning (CN); and Xu Han, Nanning (CN)
Assigned to HUANENG GUANGXI CLEAN ENERGY CO., LTD., Nanning (CN)
Filed by HUANENG GUANGXI CLEAN ENERGY CO., LTD., Guangxi (CN)
Filed on Dec. 30, 2024, as Appl. No. 19/006,168.
Claims priority of application No. 202410308664.8 (CN), filed on Mar. 19, 2024.
Prior Publication US 2025/0297597 A1, Sep. 25, 2025
Int. Cl. F03D 7/02 (2006.01); F03D 80/70 (2016.01)
CPC F03D 7/0224 (2013.01) [F03D 7/024 (2013.01); F03D 80/709 (2023.08); F05B 2260/74 (2013.01); F05B 2260/79 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A method for independently pitching of a wind turbine, comprising:
driving a first gear using a pitch motor, such that a second gear meshed with the first gear drives a bearing inner ring to rotate to drive a paddle of a wind turbine connected to an outer side of the bearing inner ring, the bearing inner ring being connected to a root of the paddle of the wind turbine;
inflating and pressurizing, using an air pump, an airbag, to cause the airbag to increase in volume inside a lubricating ball, to discharge a lubricating fluid from an interior of the lubricating ball through discharge holes and connecting tubes;
the lubricating fluid flowing into an annular flow chamber through connecting holes, and flowing, through seepage holes, into a rotational gap between a bearing outer ring and the bearing inner ring, wherein the annular flow chamber is an annular structure for the lubricating fluid to flow, and the annular flow chamber is located in an interior of the bearing outer ring; and
dissipating heat generated by the pitch motor through a dust-proof net and a waterproof breathable membrane included in heat dissipation holes.