WIND TURBINE AND ROTOR BLADE FOR A WIND TURBINE

Abstract

A rotor blade for a wind turbine, comprising a rotor blade root for fixing the rotor blade to the hub of a wind turbine, an inner blade portion which extends from the rotor blade root in the direction of a longitudinal extension of the rotor blade, and a rear edge segment for increasing the depth of the rotor blade in the profile depth direction in the region of the inner blade portion, wherein the rear edge segment is fixed to the inner blade portion and has an edge facing the inner blade portion. A cover lip is proposed which overlaps with the edge and is arranged in a transition region from the inner blade portion to the edge of the rear edge segment.

Claims

1. A rotor blade for a wind turbine, comprising: a rotor blade root for fixing the rotor blade to the hub of a wind turbine; an inner blade portion extending from the rotor blade root in a direction of a longitudinal extension of the rotor blade; a rear edge segment that increases a depth of the rotor blade in a profile depth direction in a region of the inner blade portion, wherein the rear edge segment is coupled to the inner blade portion and has an edge facing the inner blade portion; and a cover lip overlapping the edge and arranged in a transition region from the inner blade portion to the edge of the rear edge segment.

2. The rotor blade according to claim 1, wherein the cover lip overlaps the transition region.

3. The rotor blade according to claim 1, wherein the cover lip extends in sections in the direction of the longitudinal extension of the rotor blade.

4. The rotor blade according to claim 1, wherein the cover lip has a pocket with a depth, wherein the edge of the rear edge segment is received movably along the depth of the pocket.

5. The rotor blade according to claim 4, wherein the cover lip has a base member made of a fiber-reinforced plastic.

6. The rotor blade according to claim 4, wherein the pocket has one or more anti-friction members with an anti-friction surface for slidingly receiving the edge of the rear edge segment.

7. The rotor blade according to claim 6, wherein the anti-friction surface is made of a thermoplastic plastic.

8. The rotor blade according to claim 7, wherein a fabric laminate is arranged on a side of the anti-friction member facing away from the anti-friction surface.

9. The rotor blade according to claim 8, wherein the cover lip has a base member made of a fiber-reinforced plastic, wherein the fiber-reinforced plastic includes a matrix with fibers embedded in the matrix, and wherein the fabric laminate is joined to the matrix of the fiber-reinforced plastic.

10. The rotor blade according to claim 7, wherein the thermoplastic plastic is selected from the list: polyoxymethylene, polyethylene terephthalate, polyamide 6, polyketone, polyvinylidene fluoride and polypropylene.

11. The rotor blade according to claim 5, wherein the cover lip has a base member with a first end and a second end, wherein the pocket is arranged at the first end, and wherein an attachment portion for attachment to the inner blade portion is arranged at the second end opposite the pocket.

12. The rotor blade according to claim 11, wherein a seal having a sealing profile is arranged on the attachment portion.

13. The rotor blade according to claim 1, wherein the inner blade portion has a circular or oval cross-section.

14. The rotor blade according to claim 1, wherein the inner blade portion is provided in the form of a wound body.

15. A wind turbine, comprising: a tower; a nacelle mounted rotatably on the tower; a rotor mounted rotatably on the nacelle; and a plurality of rotor blades attached to the rotor, wherein one or more of the plurality of rotor blades is the rotor blade according to claim 1.

16. The rotor blade according to claim 1, wherein the cover lip is an integral piece that extends in the direction of the longitudinal extension of the rotor blade.

17. The rotor blade according to claim 1, wherein the inner blade portion has an elliptical cross-section.

18. The rotor blade according to claim 9, wherein the fabric laminate is embedded in the matrix of the fiber-reinforced plastic.

19. The rotor blade according to claim 12, wherein the seal is a rubber seal.

Description

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

[0028] The invention shall now be described in greater detail with reference to a preferred embodiment and the attached Figures, in which:

[0029] FIG. 1 shows a perspective view of a wind turbine;

[0030] FIG. 2 shows a rotor blade segment of a wind turbine, as shown in FIG. 1;

[0031] FIG. 3 shows a cross-sectional view of the rotor blade segment shown in FIG. 2;

[0032] FIG. 4 shows a detail view of the cross-sectional view of the rotor blade segment shown in FIG. 3;

[0033] FIG. 5 shows a detail view of a portion of a cover lip, as shown in FIG. 4;

[0034] FIG. 6 shows further detail views of a rotor blade segment, as shown in FIG. 2;

[0035] FIG. 7 shows a cross-sectional view of a cover lip, as shown in FIGS. 1 to 6; and

[0036] FIG. 8 shows a perspective view of a cover lip, as shown in FIGS. 1 to 7.

DETAILED DESCRIPTION

[0037] FIG. 1 shows a wind turbine 100 comprising a tower 102 and a nacelle 104.

[0038] A rotor 106 is arranged on nacelle 104 by means of a rotor blade root 201. Rotor 106 has three rotor blades 200 that are each connected by a rotor blade root 201 to a spinner 110. In operation, rotor 106 is made to rotate by the wind, thus driving a generator (not shown) in nacelle 104, which converts the rotational energy of rotor 106 into electrical current.

[0039] FIG. 2 shows a rotor blade segment 202 of one of the rotor blades 200 shown in FIG. 1. Rotor blade segment 202 has an inner blade portion 204 and a rear edge segment 208 for increasing the depth of rotor blade 200 in a profile depth direction (205) (see FIG. 3). In the longitudinal direction of rotor blade segment 202, the rear edge segment 208 is embodied here in two parts, although only the section of rear edge segment 208 facing inner blade portion 204 is shown.

[0040] The inner blade portion 204 has a wound body 206 and a flange portion 254 for connecting the blade to the hub of rotor 106 (FIG. 1). Rear edge segment 208 is arranged on the wound body. The rear edge segment has a supporting structure 220, as well as shell elements arranged on the suction side 222 and the pressure side 224. In FIG. 2, only shell elements 210, 210, 210 on the pressure side are shown. Shell elements 210, 210, 210 are arranged adjacent each other along the rotor blade's longitudinal extension 226. To enable rear edge segment 208 to be joined to one or more trailing edges of the rotor blade (not shown), rear edge segment 208 has end edges 212, 212, 212 and respective transition regions 214.

[0041] Cover lips 216, 216 and 216 which overlap transition region 207 and the edge 209 of rear edge segment 208 are arranged at the transition region between the wound body 206 of inner blade portion 204 and rear edge segment 208 with the respective shell segments 210, 210, 210. These cover lips close the gap that ensues and simultaneously allow inner blade portion 204 to move relative to rear edge segment 208.

[0042] FIG. 3 shows a cross-sectional view of a rotor blade segment 202, the sectional plane being perpendicular to the rotor blade's longitudinal extension 226 (see FIG. 2). Here, rotor blade segment 202 consists of inner blade portion 204 and rear edge segment 208. Inner blade portion 204 comprises wound body 206. On both suction side 222 and pressure side 224, cover lips 216 are arranged between the shell segments on suction side 228 and the shell segment on pressure side 210. As can be seen from FIG. 3, cover lips 216 allow a smooth transition from the contour of inner blade portion 204 or wound body 206 to the contour of the shell segment on suction side 228 and the shell segment on pressure side 210. By this means, aerodynamically disadvantageous phenomena such as turbulence at the transition 207 between inner blade portion 204 and rear edge segment 208 are reduced in any case and at best prevented.

[0043] FIG. 4 shows an enlarged view of cover lip 216. Cover lip 216 has a base member 238 with a first end 250, on which an attachment portion 232 is arranged, and with a second end 252 arranged opposed the first end and on which a pocket 230 of depth T and a pocket base 247 are formed. Cover lip 216 is fixed, in particular adhesively bonded to wound body 206 by means of attachment portion 232. An edge 209 of rear edge segment 208 or an edge 209 of the shell segment on suction side 228 is movably received in pocket 230. If the shell segment of suction side 228 moves, for example as a result of forces and moments caused by blade rotation, cover lip 216 allows relative movement of edge 209 in some regions in the direction of depth T of pocket 230, and toleration of such movement by means of pocket 230. In any case, the surface remains closed in an aerodynamically advantageous and secure manner in the region of transition 207 between inner blade portion 204 and rear edge segment 208, even in the case, to be expected during operation, in which inner blade portion 204 moves relative to rear edge segment 208.

[0044] The attachment portion of cover lip 216 and the attachment of cover lip 216 to wound body 206 are shown in detail in FIG. 5. Cover lip 216 is joined to wound body 206 with the aid of an adhesive layer 236. A sealing profile 234 is introduced into the space between wound body 206 and cover lip 216. This serves in particular as an assembly aid and to simplify assembly of cover lip 216, which is arranged at an incline or in a wedge shape relative to winding body 206. The shape of sealing profile 234 results in rounding of the adhesive layer, thus reducing the notch effect at the edge of the adhesive layer. This improves the join between wound body 206 and cover lip 216 in structural/mechanical terms.

[0045] FIG. 6 shows further detailed views of cover lip 216 and its interaction with wound body 206 and with the edges of rear edge segment 208 or the respective shell elements 228. As FIG. 6 clearly shows, the respective shell segment 228 is received movably in the direction of depth T in pocket 230 and can be moved here toward the pocket base 247 or in the opposite direction without leaving pocket 230 or contacting pocket base 247.

[0046] FIG. 7 shows a cross-sectional view of a pocket 230. The pocket itself is formed here by a portion of base member 238 and a pocket shell 246 joined securely to base member 238. Base member 238 and pocket shell 246 are typically made of a fiber-reinforced plastic. A first anti-friction member 240 with a first anti-friction surface 241, and a second anti-friction member 242 with a second anti-friction surface 243 are joined to base member 238 or pocket shell 246.

[0047] One edge of the rear edge segment 208 or a respective shell segment slides on anti-friction surfaces 241, 243 of anti-friction members 240 and 242. Anti-friction members 240 and 242 consist partly, in any case, of a thermoplastic plastic, such that anti-friction surfaces 241, 243 are formed thereof. A fabric laminate 244 is introduced, typically rolled into each of anti-friction members 240 and 242 on the side facing away from the inside of the pocket. This fabric laminate 244 allows the respective anti-friction members 240 and 242 to be joined on the fabric laminated side to the matrix of a fiber-reinforced plastic of base member 238 and of pocket shell 246. This allows the thermoplastic component of the first anti-friction member 240 and of the second anti-friction member 242 to be joined in a durable and stable manner to base member 238 and pocket shell 246, even if, in the region of edge 209 at least, the base member is made of a fiber-reinforced plastic with a thermosetting matrix.

[0048] FIG. 8 shows a perspective view of a cover lip 216. Cover lip 216 has an attachment portion 232 and a base member 238. Pocket 230 is arranged on the side opposite attachment portion 232.

LIST OF REFERENCE SIGNS USED

[0049] 100 Wind turbine [0050] 102 Tower [0051] 104 Nacelle [0052] 106 Rotor [0053] 110 Spinner [0054] 200 Rotor blades [0055] 201 Rotor blade root [0056] 202 Rotor blade segment [0057] 204 Inner blade portion [0058] 205 Profile depth direction [0059] 206 Wound body [0060] 207 Transition region [0061] 208 Rear edge segment [0062] 209 Edge of the rear edge segment [0063] 210, 210, 210 Shell segments on the pressure side [0064] 212, 212, 212 End edges [0065] 214 Transition regions of the end edges [0066] 216, 216, 216 Cover lip [0067] 218 Seal element [0068] 220 Supporting structure [0069] 222 Suction side [0070] 224 Pressure side [0071] 226 Longitudinal extension of the rotor blade [0072] 228 Shell segment on the suction side [0073] 230 Pocket [0074] 232 Attachment portion [0075] 234 Sealing profile [0076] 236 Adhesive [0077] 238 Base member [0078] 240 First anti-friction member [0079] 241 First anti-friction surface [0080] 242 Second anti-friction member [0081] 243 Second anti-friction surface [0082] 244 Fabric laminate [0083] 246 Pocket shell [0084] 247 Pocket base [0085] 248 Cover lip base member [0086] 250 First end [0087] 252 Second end [0088] 254 Cross-section of the inner blade portion