Wind turbine blade root attachment system and method of manufacture
Devices, systems, and methods of manufacturing wind turbine root attachment are provided. In various embodiments, an assembly for wind turbine root attachments includes a bushing, a core, and a filler. The bushing includes a body having cutouts extending from the proximal end to the distal end on either side of the bushing and a core cutout at the distal end. The bushing further includes an ear disposed at the proximal end of the bushing and within the first cutout. The core includes two wedges where the thick end of each wedge abut one another. The thin end of the proximal wedge is disposed within the core cutout and the core includes cutouts extending from the proximal end to the distal end on either side of the core. The filler is disposed within the cutout on the side of the assembly having the ear.
1. A wind turbine blade root attachment assembly comprising:
a bushing having a proximal end and a distal end,
a first cutout on a first side of the bushing,
a second cutout on a second side of the bushing, and
a core cutout at the distal end;
an ear disposed within the first cutout of the bushing;
a core having a proximal end and a distal end, the core comprising
a third cutout on a first side of the core,
a fourth cutout on a second side of the core;
wherein the proximal end of the core is disposed within the bushing with the first cutout of the bushing and the third cutout of the core having a common longitudinal axis; and
a filler disposed within the first cutout and the third cutout, the filler contacting the ear.
2. The assembly of claim 1 , wherein the joined bushing and core form a non-arcuate unified part.
3. The assembly of claim 1 , wherein a plurality of joined bushings and cores are positioned adjacent each other and configured as a ring.
4. The assembly of claim 3 , wherein a filler is disposed between adjacent joined bushing-core parts.
5. The assembly of claim 3 , wherein the inner circumferential surface of the ring is a continuous surface having a constant inner diameter.
6. The assembly of claim 3 , wherein the outer circumferential surface of the ring is a continuous surface having a constant outer diameter.
7. The assembly of claim 1 , wherein the core is tapered with the distal end of the core configured to lie flat within a blade mold.
8. The assembly of claim 1 , wherein the filler has a cylindrical portion at a proximal end and a conical portion at a distal end thereof.
9. The assembly of claim 1 , wherein the core further comprises a wedge-shaped cutout at a distal end thereof.
10. The assembly of claim 1 , wherein the first cutout of the bushing and the third cutout of the core are configured with an arcuate-shape.
11. The assembly of claim 1 , wherein the proximal end of the filler is disposed within the first cutout of the bushing and the distal end of the filler is disposed within the third cutout of the core.
12. The assembly of claim 1 , wherein the proximal end of the filler engages the ear.
13. The assembly of claim 1 , wherein the ear has a radius of curvature equivalent to the radius of the first cutout of the bushing.
14. The assembly of claim 1 , wherein the bushing, ear, core and filler are discrete components.
15. The assembly of claim 1 , wherein the core comprises a first wedge and a second wedge distal to the first wedge, each wedge having a thick end and a thin end, wherein the thick end of the first wedge abuts the thick end of the second wedge.
16. A method of forming a wind turbine blade root attachment system, the method comprising:
providing a plurality of assemblies, each assembly comprising:
a bushing having:
a body having a proximal end and a distal end,
a first cutout on a first side of the bushing,
a second cutout on a second side of the bushing, and
a core cutout at the distal end,
an ear, the ear disposed at the proximal end of the bushing and within the first cutout;
a core, the core having:
a proximal end and a distal end,
a third cutout on a first side of the core,
a fourth cutout on a second side of the core; and
a filler, the filler disposed within the first bushing cutout and the third core cutout, and contacting the ear;
engaging the filler and the ear of a first assembly of the plurality of assemblies into the second bushing cutout and the fourth core cutout of a second assembly of the plurality of assemblies; and
forming the plurality of assemblies into a ring.
17. The method of claim 16 , wherein the bushing and core are attached as an initial sub-assembly, with the filler inserted between adjacent bushing-core subassemblies.
18. The method of claim 16 , further comprising applying adhesive between surfaces of the core, bushing, ear and filler.
19. The method of claim 16 , wherein the plurality of subassemblies are assembled on a flat surface, and thereafter rotated to bring the ends of the assembly into engagement to form the ring.
20. The method of claim 16 , further comprising positioning the distal end of the bushings within a wind turbine blade mold.