Pitch mechanism and wind turbine

Abstract

The invention provides a pitch-changing mechanism for a wind power generating set and a wind power generating set with the pitch-changing mechanism. The pitch-changing mechanism includes a pitch-changing bearing and a drive gear, and the pitch-changing bearing includes an outer bearing ring fixed to the hub and an inner bearing ring connected to the blades. The pitch-changing mechanism also includes a flange. The flange is mounted on the hub, the driving gear is mounted on the flange and engages with the teeth on the inner ring of the bearing, and the mounting position of the flange on the hub is along the variable The circumferential direction of the paddle bearing is adjustable. According to the technical solution of the present invention, in the case of partial wear of the ring gear on the inner ring of the bearing, it is possible to change the concentrated meshing area of ​​the ring gear without dismantling the drive accessories such as the pitch motor and the reducer, thereby greatly improving the service life of the pitch bearing Long life and reliability with easy and low maintenance cost.

Description

technical field [0001] The present invention relates to the technical field of wind power generation, and more specifically, relates to a pitch-changing mechanism for a wind-driven generating set and a wind-driven generating set including the pitch-changing mechanism. Background technique [0002] The wind turbine is a large-scale power generation device that converts wind energy into electrical energy through the rotation of the impeller. The wind turbine uses the pitch device to adjust the blade angle of the blade according to the change of wind speed to control the absorption of wind energy by the impeller. [0003] During the normal operation of the wind turbine, when the wind speed exceeds the rated wind speed of the wind turbine, in order to control the power output of the wind turbine, the blade angle of the blade is controlled between 0° and 30° by the pitch control device to ensure that the impeller The rotational speed is limited within the rated range, and the shu...

AI Technical Summary

Problems solved by technology

[0005] However, since drive gears are generally harder than pitch bearings, the bearing cone ring gear is a wear part

In addition, when the wind turbine is running, the angle of the blades is constant, resulting in a single meshing area between the inner ring gear of the bearing and the drive gear of the reducer, which is prone to tooth surface erosion and damage in local areas of the ring gear of the bearing inner ring and the drive gear of the reducer

During the service period of the wind turbine, after the ring gear is worn and damaged, it is necessary to remove the blades, disassemble the rotor and the transmission system to replace the damaged ring gear, which is difficult and costly to replace

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