Gas turbine having seal assembly with coverplate and seal

• US 8,696,320 B2
• Filed: 03/12/2009
• Issued: 04/15/2014
• Est. Priority Date: 03/12/2009
• Status: Active Grant

• Current Assignee: GE Infrastructure Technology, LLC (GE Vernova, Inc.)
• Original Assignee: General Electric Company
• Inventors: Harris, John Wesley Jr., Piersall, Matthew Robert, Potter, Brian Denver
• Primary Examiner(s): Smith, Zandra
• Assistant Examiner(s): Niesz, Jamie C
• Application Number:
  US12/402,800
• Publication Number:
  US 20100232938A1
• Time in Patent Office: 1,860 Days
• Field of Search: 415/175, 416/95, 416/174, 416/244.R, 416/248
• US Class Current: 416/248
• CPC Class Codes: F01D 11/006 Sealing the gap between rotor blades or blades and rotor
• CPC Class Codes: F01D 5/26 Antivibration means not restricted to blade form or construction or to blade-to-blade connections or to the use of particular materials
• CPC Class Codes: F01D 5/3015 with side plates

Abstract

A gas turbine and a seal assembly for a machine having a rotating shaft, a wheel coupled to the rotating shaft, the wheel including a bucket coupled to the wheel comprising a coverplate that is fastened to the wheel and the bucket and a seal positioned between the coverplate and the wheel and the bucket.

Claims

1. A gas turbine comprising:

a rotating shaft;

a wheel coupled to the rotating shaft;

a bucket coupled to the wheel;

a coverplate fastened to the wheel and the bucket; and

a sheet seal positioned between the coverplate and an interface between the wheel and the bucket,

wherein the sheet seal extends along a side of the bucket and the wheel to cover and seal the entire interface between the wheel and the bucket, and

wherein the coverplate is positioned over the entire sheet seal.

2. The gas turbine of claim 1, wherein the coverplate includes an angel wing.

3. The gas turbine of claim 1, wherein the coverplate includes a hook for fastening the coverplate to the wheel of the gas turbine.

4. The gas turbine of claim 1, wherein the coverplate includes an outer edge that engages a slot in the bucket of the gas turbine.

5. The gas turbine of claim 1, wherein the sheet seal includes a 360-degree seal with a single split.

6. The gas turbine of claim 1, wherein the sheet seal includes a 720-degree multi-coil seal.

7. The gas turbine of claim 1, wherein the sheet seal includes a segmented seal.

8. The gas turbine of claim 1, wherein the coverplate includes at least one segment and the sheet seal is positioned on the at least one coverplate segment to eliminate a gap between adjacent circumferentially positioned coverplate segments.

9. The gas turbine of claim 1, wherein the coverplate includes a hook for fastening the coverplate to the wheel and the bucket includes a hook for fastening the sheet seal to the bucket.

10. The gas turbine of claim 1, wherein the coverplate and sheet seal cover the interface between the wheel and the bucket.

11. A seal assembly for a machine having a rotating shaft, the seal assembly comprising:

a wheel coupled to the rotating shaft;

a bucket coupled to the wheel;

a coverplate fastened to the wheel and the bucket of the machine; and

a sheet seal positioned between the coverplate and an interface between the wheel and the bucket,

wherein the sheet seal extends along a side of the bucket and the wheel to cover and seal the entire interface between the wheel and the bucket, and

wherein the coverplate is positioned over the entire sheet seal.

12. The seal assembly of claim 11, wherein the coverplate includes an angel wing.

13. The seal assembly of claim 11, wherein the coverplate includes a hook for fastening the coverplate to the wheel of the machine.

14. The seal assembly of claim 11, wherein the coverplate includes an outer edge that engages a slot in the bucket of the machine.

15. The seal assembly of claim 11, wherein the sheet seal includes a 360-degree seal with a single split.

16. The seal assembly of claim 11, wherein the sheet seal includes a 720-degree multi-coil seal.

17. The seal assembly of claim 11, wherein the sheet seal includes a segmented seal.

18. The seal assembly of claim 11, wherein the coverplate includes at least one segment and the sheet seal is positioned on the at least one coverplate segment to eliminate a gap between adjacent circumferentially positioned coverplate segments.

19. The seal assembly of claim 11, wherein the coverplate includes a hook for fastening the coverplate to the wheel and the bucket includes a hook for fastening the sheet seal to the bucket.

20. The seal assembly of claim 11, wherein the coverplate and sheet seal cover the interface.