Individual pitch control device for blade root

Abstract

The invention discloses an individual pitch control device for a blade root. The individual pitch control device comprises a blade root part, an air cylinder barrel, a pressure regulating piston, a driving mechanism and a pitch control mechanism, the blade root part is cylindrical, an opening in the end part of the blade root part is sealed in the form of a piston, the air cylinder barrel is usedfor being fixed on a hub of a wind turbine, the two ends of the air cylinder barrel are opened, the blade root part is matched with the air cylinder barrel in sealed and sliding mode, the pressure regulating piston is arranged at the other end of the inner cavity wall of the air cylinder barrel, the driving mechanism is used for driving the pressure regulating piston to adjust the pressure in theair cylinder barrel, the pitch control mechanism comprises a spiral guide rail and sliding blocks, the spiral guide rail is arranged on the outer side of the blade root part or the inner wall of the air cylinder barrel, the sliding blocks are fixed to the inner wall of the air cylinder barrel or the outer side of the blade root part and are matched with the spiral guide rail in a sliding mode, a blade of the wind turbine drives the blade root part to telescope in an inner cavity of the air cylinder barrel under the action of the gravity of the blade and the air pressure in the air cylinder barrel in the rotating process, and in the telescoping process, the pitch control mechanism automatically drives the blade to be twisted. According to the individual pitch control device for the blade root, the cost can be reliably lowered, and the alternating load can be reliably restrained.

Description

technical field [0001] The invention relates to a wind turbine, in particular to a blade root independent pitch changing device. Background technique [0002] As a renewable green energy source, wind turbines only need to utilize the kinetic energy of the wind. The cost of wind energy utilization is mainly composed of three aspects: manufacturing, installation and commissioning, and operation and maintenance. Among them, lean manufacturing of equipment is the foundation. Considering the cost of wind turbines, there are two technical paths to improve economy. One is to reduce the cost of main components through fine design, and the other is to extend the operating life of key components. For technical transformation of in-service blades which accounts for 20% of the cost of the whole machine, the latter is a more feasible way. [0003] The design life of a wind turbine is more than 20 years. Taking a 2MW unit as an example, its blades will rotate about 10 8 On a weekly bas...

AI Technical Summary

Problems solved by technology

The independent pitch control method can effectively reduce the alternating load, but the corresponding cost is also high, because it increases the pitch frequency, and greatly increases the requirements of the sensor and actuator, and the cost of suppressing the alternating load is high

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