WIND TURBINE BLADE WITH IMPROVED TRAILING EDGE BOND

• US 20110142668A1
• Filed: 09/14/2010
• Published: 06/16/2011
• Est. Priority Date: 09/14/2010
• Status: Active Grant

• Current Assignee: GE Infrastructure Technology, LLC (General Electric Company)
• Original Assignee: General Electric Company
• Inventors: Rao, Kavala Venkateswara
• Granted Patent: US 8,038,407 B2
• Time in Patent Office: Days
• US Class Current: 416/229.R
• CPC Class Codes: F03D 1/0675 of the blades
• CPC Class Codes: Y02E 10/72 Wind turbines with rotation axis in wind direction

Abstract

A wind turbine blade includes a leading edge and a trailing edge. The blade has an upper shell member and a lower shell member, with each of the shell members having a forward edge bonded at the leading edge of the blade and a rearward edge. A rigid bond cap is pre-formed into a designed size and shape of the trailing edge of the blade. The bond cap includes oppositely oriented leg members bonded to the respective rearward edges of the shell members so as to be essentially flush with the upper and lower shell members. The rigid bond cap defines at least a portion of the trailing edge of the blade and a primary external bonding bridge between the upper and lower shell members at the rearward edges.

Claims

1. A wind turbine blade with a leading edge and a trailing edge, said blade comprising:

an upper shell member and a lower shell member, each of said upper shell member and said lower shell member comprising a forward edge bonded at said leading edge and a rearward edge; and

,

a rigid bond cap pre-formed into a designed size and shape so as to define at least a portion of said trailing edge of said blade, said bond cap comprising oppositely oriented leg members bonded to said respective rearward edges of said upper and lower shell members so as to define at least a portion of said trailing edge of said blade and be essentially flush with said upper and lower shell members;

wherein said rigid bond cap defines a primary external bonding bridge between said rearward edge of said upper and lower shell members.

2. The wind turbine blade as in claim 1, further comprising an internal cushion pad disposed between said rearward edges of said upper and lower shell members, said cushion pad primarily preventing crashing of said upper and lower shell members along said rearward edges.

3. The wind turbine blade as in claim 2, wherein said cushion pad comprises a compressible resilient material.

4. The wind turbine blade as in claim 2, wherein said cushion pad comprises a rigid material.

5. The wind turbine blade as in claim 4, wherein said cushion pad comprises a bond paste that further defines an internal secondary bond between said rearward edges.

6. The wind turbine blade as in claim 5, wherein said bond paste extends beyond said rearward edges and at least partially fills said bond cap.

7. The wind turbine blade as in claim 1, further comprising a reduced thickness notch defined in each of said rearward edges, said bond cap bonded to said rearward edges at said respective notches.

8. The wind turbine blade as in claim 7, wherein said upper and lower shell members comprise structural reinforcement members at said respective rearward edge, said notch defined in said structural reinforcement member.

9. The wind turbine blade as in claim 8, comprising a layer of bond paste between said structural reinforcement member and said leg of said bond cap.

10. The wind turbine blade as in claim 1, wherein said bond cap comprises a continuous structural member having an open end and a closed apex.

11. The wind turbine blade as in claim 1, wherein said blade comprises a plurality of blade segments, said bond cap comprising a single member that is common to and interconnects said blade segments.

12. The wind turbine blade as in claim 1, wherein said blade comprises a plurality of blade segments, each of said segments comprising a respective said bond cap, and further comprising a bridge bond cap between adjacent said blade segments.

13. A wind turbine, said wind turbine comprising a plurality of turbine blades, at least one of said turbine blades comprising:

an upper shell member and a lower shell member, each of said upper shell member and said lower shell member comprising a forward edge bonded at said leading edge and a rearward edge; and

,

a rigid bond cap pre-formed into a designed size and shape so as to define at least a portion of said trailing edge of said blade, said bond cap comprising oppositely oriented leg members bonded to said respective rearward edges of said upper and lower shell members so as to define at least a portion of said trailing edge of said blade and be essentially flush with said upper and lower shell members;

wherein said rigid bond cap defines a primary external bonding bridge between said rearward edges of said upper and lower shell members.

14. The wind turbine as in claim 13, further comprising an internal cushion pad disposed between said rearward edges of said upper and lower shell members, said cushion pad primarily preventing crashing of said upper and lower shell members along said rearward edges.

15. The wind turbine as in claim 14, wherein said cushion pad comprises a compressible resilient material.

16. The wind turbine as in claim 14, wherein said cushion pad comprises a bond paste that further defines an internal secondary bond between said rearward edges.

17. The wind turbine as in claim 13, further comprising a reduced thickness notch defined in each of said rearward edges, said bond cap bonded to said rearward edges along said respective notches.

18. The wind turbine as in claim 17, wherein said upper and lower shell members comprise structural reinforcement members at said respective rearward edge, said notch defined in said structural reinforcement member.

19. The wind turbine as in claim 13, wherein said blade comprises a plurality of blade segments, said bond cap comprising a single member that is common to and interconnects said blade segments.

20. The wind turbine as in claim 13, wherein said blade comprises a plurality of blade segments, each of said segments comprising a respective said bond cap, and

further comprising a bridge bond cap between adjacent said blade segments.