Wind turbine blade with sections that are joined together

Abstract

A wind turbine blade comprising at least two wind turbine blade sections connected in a blade connection joint, where each blade section at their connection end comprises a number of corresponding dentations arranged to interconnect across the blade connection joint. One of the blade sections comprises a spar cap structure and a connecting part with a first end joined to the spar cap structure and an opposite second end positioned at the blade section connection end and comprising a number of the dentations. The connecting part further comprises a number of sheets which are interleaved with the fibre-reinforced layers of the spar cap structure in an overlapping zone thereby joining the spar cap structure and the connecting part. The invention further relates to a method for preparing a wind turbine blade section as mentioned above. The invention also relates to a method of preparing a sheet for a connecting part with a number of dentations at one end, which method involves cutting and rolling a number of unidirectional prepreg sheets to form fingers, placing in an open mould the fingers next to each other and partially apart such as to form the dentations, closing the mould, and fully or partially curing the sheet.

Description

technical field [0001] The invention relates to a segmented blade for a wind turbine comprising at least a first blade segment and a second blade segment extending in opposite directions from a blade joint And structurally connected by spar bridges. Background technique [0002] A modern wind turbine comprises a plurality of wind turbine rotor blades, usually three blades, each weighing up to 35 tons and up to 55 meters long. [0003] Traditionally, a blade comprises two shell parts, one shell part defining the windward side shell part and the other shell part defining the leeward side shell part. Each housing part is conventionally made in one piece. [0004] In one type of blade sometimes referred to as a structural shell blade, the blade is stiffened by individual shell components including one or more spar caps that act as stiffening spars extending longitudinally in each shell. Additionally, a plurality of webs are located in the cavity between two wind turbine shell...

AI Technical Summary

Problems solved by technology

[0008] Wind turbine blades manufactured in parts or sections for later joining are known, however the main problem is to obtain the necessary strength of the joints between the joined blade parts and the safe transfer of loads and moments across the joints

Furthermore, difficulties may arise in designing and fabricating blade joints without compromising blade stiffness and weight considerations

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