Two-sectional inclined folding blade device for large wind-driven generator

Abstract

The invention discloses a two-sectional inclined folding blade device for a large wind-driven generator. The two-sectional inclined folding blade device for the large wind-driven generator comprises a wind turbine hub, a two-sectional combined blade and a blade connecting device, wherein the two-sectional combined blade comprises a main blade and a folding blade, the main blade is a fixed blade and the folding blade is a rotating blade; the folding blade is driven to rotate by a drive motor and a rotating gear directly; an included angle is formed between the rotating axis of the folding blade and the upper reference axis of the main blade; the folding blade can perform upward rotating movement and downward rotating movement, and one side of the blade has a warped edge, so that the rotating torque can be adjusted conveniently aiming at different wind conditions; and therefore, an effect of variable pitch is achieved. When strong wind and wind damage is met, the device can enter a completely folded position of safety protection. The device provided by the invention can be manufactured and assembled in sections, has the characteristics of simple structure, convenience in field assembly and maintenance, and easiness and convenience in control of the start and the shutdown of the blades, and is particularly suitable for large and ultra-large blade units.

Description

technical field [0001] The invention relates to a blade structure of a large-scale wind power generator and belongs to the field of wind power generation equipment. Background technique [0002] Most of today's energy sources are fossil fuels: coal, oil, and natural gas. At current rates of use, the remaining known coal deposits will be used up in about 200 years, while oil and gas will be used up in less than 100 years. do. Fossil fuels cause a lot of environmental pollution when used, including greenhouse gases that contribute to global warming. Wind energy is one of the most commercially viable and dynamic renewable energy sources. It is clean, low-cost, and inexhaustible. Wind power has the advantages of large growth space for installed capacity, rapid cost reduction, safety, and energy never being exhausted. Wind power can effectively alleviate air pollution, water pollution and global warming while providing a stable power supply for economic growth. Among all kind...

AI Technical Summary

Problems solved by technology

[0007] 1. In terms of large scale, megawatt-level wind turbines have commercial value now, and their single-unit capacity can reach 2-3MW. At present, the largest offshore wind turbine has a single-unit capacity of up to 5MW, and the length of the wind turbine blades is also greater than 30m. , the weight of the generator set is also relatively heavy, which will inevitably bring greater difficulties in transportation and installation, and the structural safety of the wind turbine set will also face greater risks when the wind is strong

[0008] 2. In terms of variable speed operation, that is, compared with constant speed wind turbines, variable speed wind turbines have the advantages of large power generation, good adaptability to wind speed changes, low production costs, and high efficiency. However, for large wind turbines, due to The blades are longer and heavier, and the control of their inertia will be a difficult point

[0009] 3. In terms of design and operation of variable pitch, fixed pitch is currently developing towards variable pitch. The advantages of variable pitch adjustment are good starting performance of the unit, stable output power, small force on the unit structure, and convenient and safe shutdown. The pitch control mechanism is more complicated, which also increases the failure probability of the pitch device, and the control program is more complicated

[0012] As far as blades are concerned, today’s large-scale wind power generation equipment has the following deficiencies: the size of large blades is getting longer and longer, which puts forward higher and higher requirements for the weight, strength and stiffness of blade materials. , maintenance brings great difficulties; therefore, for the manufacture and installation of large blades, for the complexity of the pitch mechanism, for the stability of the output power during the operation of the unit, for the startability and shutdown convenience and safety of the unit, etc. , the study of new blade technology is one of the technical keys and difficulties in the development of large and super large blade structures today

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