Blade pitch variation device of wind power generating unit

Abstract

The invention provides a blade pitch variation transmission assembly. The blade pitch variation transmission assembly comprises a winding drum, a pitch variation bearing and a connection belt providedwith two connection ends; and the connection belt is wound around the winding drum, the two connection ends are made to be fixedly connected to the pitch variation bearing from the two sides of the winding drum, and the tangent points between the connection belt and the two sides of the pitch variation bearing are located on the two sides of a connection line between the center point of the winding drum and the center point of the pitch variation bearing correspondingly. The blade pitch variation transmission assembly drives the pitch variation bearing to rotate through the winding drum so that the pitch angle of a blade can be changed, and meanwhile, the pitch variation convenience and safety can be improved. Accordingly, the invention further provides a blade pitch variation method anda power generating unit.

Description

technical field [0001] The present invention relates to the field of wind power generators, in particular to a blade pitching transmission assembly, a corresponding blade pitching method and a generator set. Background technique [0002] At present, there are mainly three methods of gear pitch, hydraulic pitch and synchronous belt pitch to realize the pitch of wind turbines. Among them, the pitch of the gear is to use the power device (a multi-purpose motor, and hydraulic pressure can also be used as power) to drive the pinion to drive the large ring gear. At the same time, the blade is fixed on the large ring gear, and the blade pitch angle is realized by the rotation of the large ring gear. The change. Hydraulic pitching uses high-pressure liquid as the power source to drive two hydraulic cylinders arranged in a certain position to perform linear motion. Through a certain structural design, the linear motion is changed into the circular motion of the pitch bearing, thereb...

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Problems solved by technology

[0003] Among them, the gear pitch is rigid gear meshing, which is not convenient for the release of vibration during the operation of the unit; the hydraulic pitch, because high-pressure oil is used as the power source, there is a risk of oil leakage in the pipeline and working equipment during operation ; Synchronous belt variable pitch, because the synchronous belt is mostly made of rubber, although steel wire or carbon fiber is used as the core material, the overall strength is difficult to meet the use requirements in a very short period of time, and there is a risk of fracture

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