Passive independent variable-pitch blade

Abstract

The invention discloses a passive independent variable-pitch blade. The passive independent variable-pitch blade comprises a blade root part, an air cylinder barrel and a variable-pitch mechanism, wherein the blade root part is a column-shaped body, and an end part opening of the blade root part is sealed in the form of a piston; the air cylinder barrel is used for being fixed on a hub of a wind turbine, one end of the air cylinder barrel is opened, and the column-shaped body at the blade root part is in sealed sliding fit with an inner cavity wall of the air cylinder barrel, the variable-pitch mechanism comprises a spiral guide rail and a sliding block, the spiral guide rail is arranged on the inner wall side of the air cylinder barrel, the sliding block is fixed at the position, corresponding to the spiral guide rail, of the blade root part or the spiral guide rail is arranged on the outer side of the blade root part, the sliding block is fixed on the inner wall of the cylinder barrel, the sliding block is in sliding fit with the spiral guide rail, the blade of the wind turbine drive the blade root part to extend and retract in the inner cavity of the air cylinder barrel under the gravity of the blade in the rotating process, and the variable-pitch mechanism is used for automatically driving the blade to twist during the blade is extended and retracted. The passive independent variable-pitch blade can be used for restraining alternating load by means of low cost.

Description

technical field [0001] The invention relates to a wind turbine, in particular to a passive independent pitch blade. 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 basis, it is sub...

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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