A kind of wind power generator and pitch-changing device thereof

Abstract

The invention discloses a variable propeller device which comprises a first chain wheel and a second chain wheel meshed with a chain separately for realizing chain transmission, wherein the first chain wheel is in coaxial rigid connection with a flange for rotating a variable propeller; and the second chain wheel is connected with a driving mechanism for driving the second chain wheel to rotate. The invention further discloses a wind turbine generator. The variable propeller device applies the driving manner of the chain wheels and the chain in the variable propeller device of the wind turbine generator, and is simple in structure, reasonable in size, uniform in wear, stable in variable propeller, long in service life, easy to maintain and repair, and low in repairing cost.

Description

technical field [0001] The invention relates to the technical field of wind power generation, in particular to a pitch control device. It also relates to a wind generator using the above-mentioned pitch control device. Background technique [0002] The variable pitch system has replaced the fixed pitch system to become the mainstream of wind turbines. As an important execution structure of wind turbine power control and safe operation, it plays an important role in the operation of the wind turbine. [0003] In the first prior art, two or more pitch drive mechanisms are used, and the pitch bearings are driven by external gears. However, since the pitch angle is generally small, the worn gears are also concentrated, and the improvement of the gear life is relatively small. In the second prior art, two or more sets of hydraulic drive devices are used to realize the pitch angle, although power transmission through gears is not required to avoid the problems in the first prior...

AI Technical Summary

Problems solved by technology

However, because the pitch angle is generally small, the worn gears are also concentrated, and the improvement to the life of the gears is small.

In the second prior art, two or more sets of hydraulic drive devices are used to realize the pitch angle, although power transmission through gears is not required to avoid the problems in the first prior art, but Hydraulic cylinders are prone to oil leakage due to their own defects, and it is difficult to arrange oil cylinders and pipelines

In the third existing technology, the structural strength and rigidity of the pitch control system are improved, but it increases the complexity of the internal structure of the hub, and at the same time increases the total weight of the hub, which brings more problems to the wind turbine, and There are also similar defects of hydraulic drive

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