초록 ▼

The invention relates to a wind turbine blade comprising at least two wind turbine blade sections that include one or more strengthening structures, the ends of the strengthening structures being connected in a connection joint. The ends include corresponding connection surfaces, the one or more rel

The invention relates to a wind turbine blade comprising at least two wind turbine blade sections that include one or more strengthening structures, the ends of the strengthening structures being connected in a connection joint. The ends include corresponding connection surfaces, the one or more relevant dimensions of the surfaces being larger than the dimensions of the transverse surfaces of the strengthening structures at the ends. The one or more relevant dimensions of the connection joint are larger than that of the adjacent strengthening structure. The invention also relates to a wind turbine blade in which the at least two wind turbine blade sections include a number of substantially oblong carbon fiber strips and strips of one or further materials such as wood or glass fiber. The invention further relates to a wind turbine blade section, an assembly plant for assembling wind turbine blade sections and to a method and use of such wind turbine blades.

대표청구항 ▼

1. A wind turbine blade comprising: at least two wind turbine blade sections which are separated, said separate sections including one or more strengthening structures comprising at least one of an internal beam strengthening structure, an internal strengthening structure at the trailing edge, or an

1. A wind turbine blade comprising: at least two wind turbine blade sections which are separated, said separate sections including one or more strengthening structures comprising at least one of an internal beam strengthening structure, an internal strengthening structure at the trailing edge, or an internal strengthening structure of a surface shell structure, said strengthening structures including ends that are connected in a connection joint, said strengthening structures extending along a longitudinal direction of said wind turbine blade sections and defining a transverse cross section oriented transverse to the longitudinal direction,wherein said ends are at least partially shaped as dentated ends which include corresponding connection surfaces, one or more relevant dimensions of said connection surfaces being larger than corresponding dimensions of transverse surfaces of the strengthening structures at said ends,wherein one or more of said corresponding dimensions of transverse surfaces at said connection joint is enlarged in relation to a dimension of a transverse surface at a location adjacent to said connection joint, such that said transverse cross section of said strengthening structure is enlarged at said connection joint compared to the location adjacent to said connection joint, andwherein an adhesive on the connection surfaces adheres the connection surfaces to each other. 2. The wind turbine blade according to claim 1 wherein teeth of said dentated ends are shaped as triangles, four-sided teeth, round shapes, freehand shapes, or a combination of different shapes. 3. The wind turbine blade according to claim 2 wherein sides of the teeth comprise a pie shape comprising rounded or wedge shaped teeth in order to establish corners in a strengthening structure. 4. The wind turbine blade according to claim 1 wherein said dentated ends partly corresponding to each other and cavities are filled with one or more intermediate connectors. 5. The wind turbine blade according to claim 4 wherein the adhesive adheres the corresponding dentated ends and/or said one or more intermediate connectors to each other. 6. The wind turbine blade according to claim 1 wherein said one or more relevant dimensions of said connection surfaces, transverse surfaces, connection joint and adjacent strengthening structure may be area, length or thickness values. 7. The wind turbine blade according to claim 1 wherein said one or more relevant dimensions of said connection joint is larger than that of the adjacent strengthening structure in a direction of a root of the wind turbine blade. 8. The wind turbine blade according to claim 2 wherein the length l of one of said teeth in an enlarged connection joint is given by ℓ≥σcarbon·⁣h1·bτepoxy·h2·2=1000·h1·b10·h2·2=50⁢h1h2·b in which the h1 is the adjacent height of the strengthening structure and h2 is the enlarged height of said tooth at the same width b, said height h2 being between 2 and 10 times the size of h1. 9. The wind turbine blade according to claim 2 wherein a number of teeth in the dentated ends is between 25 and 200 per meter of strengthening structure. 10. The wind turbine blade according to claim 1 wherein said one or more strengthening structures include a plurality of oblong strips imbedded in a blade surface comprising carbon, wood and/or glass fiber strips. 11. The wind turbine blade according to claim 1 wherein enlargement of said connection joint is symmetrical in relation to the adjacent strengthening structure comprising a symmetrical in- and outwardly expansion in relation to a course of the adjacent strengthening structure. 12. A wind turbine blade comprising at least two wind turbine blade sections which are separated, said separate sections including one or more strengthening structures comprising at least one of an internal beam strengthening structure, an internal strengthening structure at the trailing edge, or an internal strengthening structure of a surface shell structure with a number of substantially oblong carbon fiber strips and strips of one or more further materials,wherein said strengthening structures include ends that are connected in a connection joint, said strengthening structures extending along a longitudinal direction of said wind turbine blade sections and defining a transverse cross section oriented transverse to the longitudinal direction,wherein said ends are at least partially shaped as dentated ends which include corresponding connection surfaces, one or more relevant dimensions of said surfaces being larger than corresponding dimensions of transverse surfaces of the strengthening structures at said ends,wherein one or more of said dimensions of transverse surfaces of the strengthening structures at said connection joint is enlarged in relation to a dimension of a transverse surface at a location adjacent to said connection joint, such that said transverse cross section of said strengthening structure is enlarged at said connection joint compared to the location adjacent to said connection joint, andwherein an adhesive on the connection surfaces adheres the connection surfaces to each other. 13. The wind turbine blade according to claim 12 wherein the carbon fibers of said substantially oblong carbon fiber strips in each wind turbine blade section are unbroken. 14. The wind turbine blade according to claim 12 wherein the corresponding ends of said carbon fiber strips are connected and corresponding ends of said strips of one or further materials are connected to the connection joint. 15. The wind turbine blade according to claim 12 wherein teeth of said dentated ends are shaped as triangles, four-sided teeth, round shapes, freehand shapes, or a combination of different shapes. 16. The wind turbine blade according to claim 15 wherein sides of the teeth comprise a pie shape comprising rounded or wedge shaped teeth in order to establish corners in a strengthening structure. 17. The wind turbine blade according to claim 15 wherein a length of one of said teeth in connection joint is given by ℓ≥σcarbon·bτepoxy·2=1000·b10·2=50·b in which b is a width of the teeth, and in which a height of the connection joint and an adjacent height of the strengthening structure are the same or substantially the same. 18. The wind turbine blade according to claim 15 wherein the number of teeth in the dentated ends is between 25 and 200 per meter of blade surface. 19. The wind turbine blade according to claim 12 wherein said dentated ends partly corresponding to each other and cavities are filled with one or more intermediate connectors. 20. The wind turbine blade according to claim 19 wherein the adhesive adheres the corresponding dentated ends and/or said one or more intermediate connectors to each other. 21. The wind turbine blade according to claim 12 wherein said one or more strengthening structures include a plurality of oblong strips imbedded in a blade surface comprising carbon, wood and/or glass fiber strips. 22. The wind turbine blade according to claim 12 wherein said connection joint is enlarged in relation to the adjacent strengthening structure. 23. The wind turbine blade according to claim 22 wherein a length l of one of said teeth in the enlarged connection joint is given by ℓ≥σcarbon·h1·bτepoxy·h2·2=1000·h1·b10·h2·2=50⁢h1h2·b in which the h1 is an adjacent height of the strengthening structure and h2 is an enlarged height of said tooth at a same width b, said height h2 being between 2 and 10 the size of h1. 24. The wind turbine blade according to claim 22 wherein said one or more relevant dimensions of said connection joint is larger than that of the adjacent strengthening structure in a direction of a root of the wind turbine blade. 25. The wind turbine blade according to claim 22 wherein the enlargement of said connection joint is symmetrical in relation to the adjacent strengthening structure comprising a symmetrical in- and outwardly expansion in relation to a course of the adjacent strengthening structure. 26. The wind turbine blade according to claim 22 wherein said one or more relevant dimensions of said connection surfaces, transverse surfaces, said connection joint and adjacent strengthening structure comprises area, length or thickness values. 27. The wind turbine blade according to claim 12 wherein the connection joint is covered with a cover surface. 28. A wind turbine blade section to be used in a wind turbine blade, wherein said blade section comprises: a strengthening structure comprising at least one of an internal beam strengthening structure, an internal strengthening structure at the trailing edge, or an internal strengthening structure of a surface shell structure with an end including a connection surface for connection to another blade section at a connection joint, wherein said end is at least partially shaped as dentated ends, said strengthening structure extending along a longitudinal direction of the wind turbine blade section and defining a transverse cross section oriented transverse to the longitudinal direction,one or more relevant dimensions of said surface being larger than dimensions of transverse surfaces of the strengthening structures at said end,wherein one or more of said dimensions of transverse surfaces of the strengthening structures at said end is enlarged in relation to a dimension of a transverse surface at a location adjacent to the end and the connection joint, such that said transverse cross section of said strengthening structure is enlarged at the connection joint compared to the location adjacent to the connection joint, andwherein said structure end includes a connection surface applied with a connector concealed behind a removable cover. 29. The wind turbine blade section according to claim 28 wherein said connector is an adhesive is concealed behind air tight plastic layers of the removable cover with use of latent cure or hot melt technology.