Blade module, a modular rotor blade and a method for assembling a modular rotor blade

1. A blade module of a modular rotor blade, the blade module comprising a fiber composite body defining a hollow blade profile extending along a longitudinal blade axis and at least one inlay located at or near a longitudinal end of the fiber composite body and comprising a receptacle and an anchoring portion to transmit tensile forces from the receptacle to the fiber composite body, the anchoring portion being anchored to the fiber composite body, and the receptacle being adapted to receive a threaded fastener.

2. The blade module according to claim 1 , wherein the fiber composite body comprises an inner surface and wherein the receptacle is arranged on an inner surface of the fiber composite body.

3. The blade module according to claim 1 , wherein the receptacle is a flange portion of the inlay adapted to receive a threaded fastener which is orientated essentially parallel to the longitudinal blade axis.

4. The blade module according to claim 1 , wherein the fiber composite body comprises an outer surface and wherein the inlay further comprises a recess allowing to access the threaded fastener in a direction normal to the outer surface.

5. The blade module according to claim 1 , wherein the fiber composite body further comprises an outer surface, an inner surface and a first lateral surface essentially perpendicularly adjoining the inner surface and the outer surface, and wherein the blade module further comprises an essentially flat intermediate piece fastened to the first lateral surface, the intermediate piece further comprising at least one hole adapted for passing the threaded fastener.

6. The blade module according to claim 5 , wherein the intermediate piece further comprises at least one conical pre-centering pin.

7. The blade module according to claim 5 , wherein the intermediate piece is fastened to the first lateral surface by at least one of a glued joint and a screw joint.

8. The blade module according to claim 5 , wherein the intermediate piece further comprises a depression around the hole on the side opposite to the first lateral surface, the depression extending to at least one of the outer surface and the inner surface.

9. The blade module according to claim 1 , wherein the inlay is L-shaped.

10. The blade module according to claim 1 , wherein at least one of the receptacle and the anchoring portion is made of a material selected from a group consisting of a metal and a fiber composite material.

11. The blade module according to claim 1 , wherein the anchoring portion and the fiber composite body are made of the same material.

12. The blade module according to claim 1 , wherein the anchoring portion comprises a surface-enlarging structure.

13. A modular wind turbine rotor blade comprising:

at least a first blade module comprising a first fiber composite body comprising a first edge and at least a first inlay extending to or near to the first edge, the first inlay comprising a first receptacle and an anchoring portion anchored to the first fiber composite body;

at least a second blade module comprising a second fiber composite body comprising a second edge and at least a second inlay extending to or near to the second edge, the second inlay comprising a second receptacle and an anchoring portion anchored to the second fiber composite body, the second receptacle being co-axially orientated to the first receptacle;

a detachable butt joint between the first blade module and the second blade module; and

a screw joint between the first inlay and the second inlay comprising a threaded fastener fastened to the first receptacle and the second receptacle.

14. The modular wind turbine rotor blade according to claim 13 , wherein the first blade module and the second blade module are transversally divided hollow profile members of the modular rotor blade.

15. The modular wind turbine rotor blade according to claim 13 , wherein the first receptacle comprises a female thread, wherein the second receptacle comprises a male thread and wherein the screw joint comprises a rod comprising a male thread on one side and an a female thread on the other side.

16. The modular wind turbine rotor blade according to claim 13 , wherein each of the first receptacle and the second receptacle comprises a bushing, wherein the screw joint comprises at least one nut and wherein the threaded fastener is selected from a group consisting of a bolt comprising a head and a threaded rod.

17. The modular wind turbine rotor blade according to claim 13 , wherein at least one of the first blade module and the second blade module further comprises an intermediate piece fastened to the respective edge, the intermediate piece comprising at least one hole adapted for passing the threaded fastener.

18. The modular wind turbine rotor blade according to claim 13 , further comprising an outer surface comprising a covered slot allowing to access the screw joint from the outer surface.

19. The modular wind turbine rotor blade according to claim 13 , wherein the second blade module is a tip part of the modular wind turbine rotor blade.