Load reduction device for pitch bearing of wind turbine

Abstract

The invention relates to a load reduction device for a pitch bearing of a wind turbine. The load reduction device comprises a hub, the pitch bearing and a plurality of load reduction components, wherein each load reduction component comprises a pressure cylinder, a support frame, a frictional disk and a frictional sheet; the outer sides of the frictional disks are fixedly connected with the inner side of a bearing flange of the hub through bolt sets; one end of each support frame is fixed on the inner side of a pitch bearing rotating ring through a bolt set, and the other end of each support frame is fixed to the corresponding pressure cylinder through a bolt set; the positions of the pressure cylinders correspond to those of the frictional disks; the support frames, the pressure cylinders and the frictional sheets rotate together with the pitch bearing rotating ring; and when the pressure cylinders produce pressure in the direction from the inner side of the bearing flange of the hub to the outer side, the frictional sheets transfer pressure onto the frictional disks and the bearing flange of the hub. Through addition of one or more of the load reduction components, load on blades of the wind turbine in the running process of the pitch bearing is released onto the flange face of a hub casting, so that the load on the pitch bearing from the blades can be reduced.

Description

technical field [0001] The invention relates to the field of wind power generators, in particular to a wind turbine pitch bearing load reduction device. Background technique [0002] At present, the inner side of the pitch bearing fixed ring of the wind turbine is fixed together with the outer side of the hub bearing flange through a bolt group, and the blades of the wind turbine are connected with the outer side of the pitch bearing rotating ring through a bolt group. As the blades used in wind turbines become longer and heavier, for mountainous wind fields with high turbulence intensity, the pitch bearings of wind turbines are increasingly loaded; during the operation of the turbine, the blades are subjected to tangential Directional forces and alternating loads during rotation act on the pitch bearing, which can easily cause damage to the pitch bearing, or even break the ball hole of the pitch bearing, causing huge economic damage and potential safety hazards. Contents ...

AI Technical Summary

Problems solved by technology

As the blades used in wind turbines become longer and heavier, for mountainous wind fields with high turbulence intensity, the pitch bearings of wind turbines are increasingly loaded; during the operation of the turbine, the blades are subjected to tangential Directional forces and alternating loads during rotation act on the pitch bearing, which can easily cause damage to the pitch bearing, and even serious situations such as breakage at the ball hole of the pitch bearing, resulting in huge economic damage and potential safety hazards

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