Method of manufacturing wind turbine blade

Abstract

Method of manufacturing a blade root of a wind turbine blade and wind turbine blade having an aerodynamically designed blade portion and a blade root adapted for releasable attachment to a hub of a wind turbine, said blade root being of laminated construction and comprising a plurality of fully bonded bushings (4) extending largely in the longitudinal direction of the blade, which bushings (4) are provided with an internal thread (5) for mounting bolts for releasable attachment to the hub, wherein the bushings (4) comprise a first portion (6) and an extension portion (7) having gradually increased flexibility in the direction away from the first portion (6) to provide a light blade of high strength.

Description

Technical field [0001] The present invention relates to a method of manufacturing a blade root of a wind turbine blade, the blade root having a plurality of fully integrated embedded bushes provided with internal threads for assembling bolts so that the blade root can be detachably Coupled to the hub of the wind turbine, the method includes the steps of: providing a first layer of fiber mat; arranging a bushing on the first layer of fiber mat so as to extend substantially in the longitudinal direction of the blade; An additional fiber cushion layer is arranged on the top of the liner; the fiber cushion is strengthened. Background technique [0002] Wind turbines have been used to develop wind energy, for example, to generate electricity for decades. In order to reduce the price of electricity produced by such wind turbines, the size of wind turbines has been increased to the current average nominal power of commercial wind turbines, about 1.5MW, while wind turbines up to 3MW are ...

AI Technical Summary

Problems solved by technology

With this prior art, a relatively large amount of root material is removed which weakens the structure so that the root must be oversized

Especially for large blades made of relatively soft modern composites like fiber reinforced plastics, stress concentrations at the end of the bushing can be detrimental since the bushing is much stiffer

In addition, this prior art method has certain negative effects, since the fiber-reinforced plastic used in the blade root is more expensive, and soon because of the introduction of high-tech carbon fiber-reinforced plastic, it will be more expensive to develop larger blades, so this step will not apply

[0008] Typically, prior art methods of the aforementioned type are labor intensive and time consuming because the bushings are spaced apart by spacers such as foam, thereby requiring precise placement of the spacers and bushings.

There is also the possibility of gas pockets forming in the root of the blade between the liner and the spacer, which are difficult to detect and can greatly affect the strength of the blade root

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