The invention relates to a wind turbine blade comprising a number of pre-fabricated strips arranged in a sequence along the outer periphery. The strips consist of a fibrous composite material, preferably carbon fibers, and consist of a wooden material, preferably plywood or wooden fibers held in a c
The invention relates to a wind turbine blade comprising a number of pre-fabricated strips arranged in a sequence along the outer periphery. The strips consist of a fibrous composite material, preferably carbon fibers, and consist of a wooden material, preferably plywood or wooden fibers held in a cured resin. The advantage is that it is possible to manufacture blades for wind turbines which are very stiff and generally have a high strength, but which nevertheless are easy to manufacture and also is much cheaper to manufacture compared to conventional manufacturing techniques. The invention also relates to methods for manufacturing prefabricated strips and for manufacturing wind turbine blades.
대표청구항▼
The invention claimed is: 1. A blade for a wind turbine, in which a part extending over at least a third of a total length from tip to hub of the blade comprises a layer along an outer periphery of a cross-section of the blade, wherein the layer is at least partly constituted by a number of pultrud
The invention claimed is: 1. A blade for a wind turbine, in which a part extending over at least a third of a total length from tip to hub of the blade comprises a layer along an outer periphery of a cross-section of the blade, wherein the layer is at least partly constituted by a number of pultruded strips of a fibrous composite material having carbon fibres as well as a number of prefabricated strips including a wooden material, wherein the strips are arranged in an alternating a sequence of at least the wooden material and the fibrous composite material along the outer periphery. 2. A blade according to claim 1, wherein the strips of the outer layer are joined by a resin infusion. 3. A blade according to claim 2, wherein the strips of the outer layer are joined by a vacuum infusion of a resin. 4. A blade according to claim 1, wherein at least some of the pre-fabricated strips are constituted by hollow tubes formed from a fibrous composite material. 5. A blade according to claim 4, wherein the pre-fabricated strips have a pultrusion direction substantially aligned with a longitudinal direction of the blade. 6. A blade according to claim 4, wherein the fibrous composite material comprises a fibre volume fraction from 50% to 90%. 7. A blade according to claim 6, wherein the fibrous composite material comprises a fibre volume fraction of from 60% to 80%. 8. A blade according to claim 4, wherein the fibrous composite material comprises a carbon fibre volume fraction from 50% to 90%. 9. A blade according to claim 8, wherein the fibrous composite material comprises a fibre volume fraction of from 60% to 80%. 10. A blade according to claim 1, wherein the wooden material is plywood. 11. A blade according to claim 1, wherein the wooden material is comprised by wooden fibres held in a cured resin. 12. A blade according to claim 1, wherein said layer is enclosed in an outer shell and an inner shell made from a fibrous composite material in a sequence along the outer periphery. 13. A blade according to claim 1, wherein load measuring fibres are enclosed in either one or both of an outer shell and an inner shell. 14. A blade according to claim 13, wherein the load measuring fibres are optical fibres being additional to, alternatively being substitute to, the reinforcing fibres. 15. A blade according to claim 13, wherein the load measuring fibres are carbon fibres being additional to, alternatively being substitute to, the reinforcing fibres. 16. A blade according to claim 13, further comprising a lightning protection device having lightning attractors, the lightning protection device being incorporated into either one or both of the shells. 17. A blade according to claim 16, wherein the lightning attractors are connected to a width of metal mesh or similar material extending over the fibre reinforced area of the shells. 18. A blade according to claim 13, wherein a radio frequency absorption medium is incorporated into either one or both of the shells. 19. A method for manufacturing a pre-fabricated strip for a blade according to claim 1, the blade having a layer material arranged along the outer periphery of the cross-section of the blade, the method comprising: assembling at least two individual materials to constitute the pre-fabricated strip; selecting at least one of the at least two individual materials among pultruded fibrous composite materials; inserting the assembled individual materials into a container; evacuating the container, infusing a curing resin, and allowing the resin to cure; and taking out from the container the assembled and fabricated cured strip. 20. A method for manufacturing a shell for a blade according to claim 1, the shell having a layer material arranged along an outer periphery of a cross-section of the shell, the layer having pre-fabricated strips, the method comprising: applying a surface material to a mold of the blade; optionally applying a metal mesh, glass fibre mesh and any transfer media; assembling at least two individual materials to constitute the pre-fabricated strips; selecting at least one of the at least two individual materials among pultruded fibrous composite materials; positioning the at least two individual materials in the mold of the blade; inserting the applied individual materials and other materials into a container; evacuating the container, infusing a curing resin, and allowing the resin to cure; and de-molding from the mold the fabricated shell. 21. A blade for a wind turbine, in which a part extending over at least a third of a total length from tip to hub of the blade comprises a layer along an outer peripheiy of a cross-section of the blade, wherein the layer is at least partly constituted by a number of pre-fabricated pultruded strips arranged in an alternating sequence of at least strips of a wooden material and strips of a fibrous composite material along the outer periphery. 22. A blade according to claim 21, wherein the strips of the outer layer are joined by a resin infusion. 23. A blade according to claim 22, wherein the strips of the outer layer are joined by a vacuum infusion of a resin. 24. A blade according to claim 21, wherein at least some of the pre-fabricated pultruded strips are constituted by hollow tubes formed from a fibrous composite material. 25. A blade according to claim 23, wherein at least some of the pre-fabricated pultruded strips are constituted by hollow tubes formed from a fibrous composite material. 26. A blade according to claim 24, wherein the fibrous composite material comprises a fibre volume fraction from 50% to 90%. 27. A blade according to claim 24, wherein the pultruded strips have a pultrusion direction substantially aligned with a longitudinal direction of the blade. 28. A blade according to claim 27, wherein the fibrous composite material comprises a carbon fibre volume fraction from 50% to 90%. 29. A blade according to claim 27, wherein the fibrous composite material comprises a fibre volume fraction from 50% to 90%. 30. A blade according to claim 29, wherein the fibrous composite material comprises a fibre volume fraction of from 60% to 80%. 31. A blade according to claim 29, wherein the fibrous composite material comprises a carbon fibre volume fraction from 50% to 90%. 32. A blade according to claim 31, wherein the fibrous composite material comprises a fibre volume fraction of from 60% to 80%. 33. A blade according to claim 21, wherein the wooden material is plywood. 34. A blade according to claim 21, wherein the wooden material is comprised by wooden fibres held in a cured resin. 35. A blade according to claim 21, wherein said layer is enclosed in an outer shell and an inner shell made from a fibrous composite material. 36. A blade according to claim 21, wherein load measuring fibres are enclosed in either one or both of an outer shell and an inner shell. 37. A blade according to claim 29, wherein the load measuring fibres are optical fibres being additional to, alternatively being substitute to, the reinforcing fibres. 38. A blade according to claim 29, wherein the load measuring fibres are carbon fibres being additional to, alternatively being substitute to, the reinforcing fibres. 39. A blade according to claim 21, wherein a lightning protection device is incorporated into either one or both of an outer shell and an inner shell, the lightning protection device includes lightning attractors. 40. A blade according to claim 39, where the lightning attractors are connected to a width of metal mesh or similar material extending over the fibre reinforced area of the shells. 41. A blade according to claim 39, further comprising a radio frequency absorption medium, the radio frequency absorption medium is incorporated into either one or both of the shells. 42. A method for manufacturing a pre-fabricated strip for a blade according to claim 20, the blade including a layer material arranged along the outer periphery of the cross-section of the blade, the method comprising: assembling at least two individual materials to constitute the pre-fabricated strip; selecting at least one of the at least two individual materials among pultruded fibrous composite materials; inserting the assembled individual materials into a container; evacuating the container, infusing a curing resin, and allowing the resin to cure; and removing from the container the assembled and fabricated cured strip. 43. A method for manufacturing a shell for a blade according to claim 21, the shell including a layer having pre-fabricated strips, the method comprising: applying a surface material to a mold of the blade; optionally applying a metal mesh, a glass fibre mesh and any transfer media; assembling at least two individual materials to constitute the pre-fabricated strips; selecting at least one of the at least two individual materials among pultruded fibrous composite materials; positioning the at least two individual materials into the mold of the blade; inserting the applied individual materials and other materials into a container; evacuating the container, infusing a curing resin, and allowing the resin to cure; and de-molding from the mold the fabricated shell. 44. The method according to claim 19, wherein the container is a bag. 45. The method according to claim 42, wherein the container is a bag. 46. The method according to claim 20, wherein the surface material is a gel coat. 47. The method according to claim 43, wherein the surface material is a gel coat.
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