Telescopic wind turbine blade

Abstract

The invention relates to a telescopic wind turbine blade. The telescopic wind turbine blade comprises a blade root telescopic part, a sealing partition plate, an air cylinder barrel, a pressure regulating piston and a driving mechanism, wherein the blade root telescopic part is a root cylinder section of wind turbine blade; the sealing partition plate is used for sealing the bottom end of the blade root expansion part so as to enable the blade root telescopic part to form a piston form; the two ends of the air cylinder barrel are opened, the air cylinder barrel is fixed on a hub of the wind turbine, and the blade root telescopic part is assembled in one end of the air cylinder barrel; the pressure regulating piston is arranged at the other end of the inner cavity wall of the air cylinder barrel, so that the sealing end part of the blade root telescopic part and the pressure regulating piston define a sealing space in the interior of the air cylinder barrel; and the driving mechanism isused for driving the pressure regulating piston to extend and contract in the other end of the air cylinder barrel so as to adjust the pressure in the air cylinder barrel, and the blades of the windturbine realize the expansion and contraction in the rotating process. By adopting the structure, the blades can be stretched and retracted for a limited stroke along with the rotation period, so thatthe wind catching load is limited, and the load of the blades is balanced, thereby reducing the alternating load.

Description

technical field [0001] The invention relates to the technical field of wind power generation, in particular to a retractable wind turbine blade. Background technique [0002] With the increasing maturity of wind turbine design and manufacturing technology for large-scale application, the cost is gradually clear. As a large part of wind turbines, blades play an important role in energy conversion and control, and their manufacturing cost is about 15-20% of the cost of the whole machine. As a renewable and clean energy source, wind turbines only need to use the kinetic energy of the wind and do not need fuel consumption throughout their life cycle. Therefore, the cost of wind turbines mainly consists of the following three aspects: manufacturing, installation and commissioning, and operation and maintenance. 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 expected operating life ...

AI Technical Summary

Problems solved by technology

[0006] However, the blade changes mentioned in this technology need to be replaced manually according to the weather conditions. At the same time, only one type of blade can be used for a period of time, and it does not have the function of real-time expansion and contraction to reduce alternating loads according to airflow conditions.

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