Enhanced bucket vibration system

• US 20070286732A1
• Filed: 06/13/2006
• Published: 12/13/2007
• Est. Priority Date: 06/13/2006
• Status: Active Grant

• Current Assignee: GE Infrastructure Technology, LLC (General Electric Company)
• Original Assignee: General Electric Company
• Inventors: Liotta, Gary Charles, Wassynger, Stephen Paul, Lagrange, Benjamin Arnette, Good, Randall Richard, Vehr, James William, Chiurato, Anthony Aaron, Crim, Jonathan David
• Granted Patent: US 7,534,090 B2
• Time in Patent Office: Days
• US Class Current: 416/190
• CPC Class Codes: F01D 5/10 Anti- vibration means specially adapted for radial flow machines or engines F01D5/04
• CPC Class Codes: F01D 5/22 Blade-to-blade connections, e.g. for damping vibrations
• 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: F05D 2240/80 Platforms for stationary or moving blades
• CPC Class Codes: F05D 2260/96 Preventing, counteracting or reducing vibration or noise

Abstract

An enhanced damping system for a turbine bucket. The damping system includes a damper pocket and a damper pin with an offset center of gravity positioned within the damper pocket.

Claims

1. A damping system for a turbine bucket, comprising:

a damper pocket; and

a damper pin positioned within the damper pocket;

wherein the damper pin comprises an offset center of gravity.

2. The damping system of claim 1, wherein the bucket comprises a convex side and wherein the damper pocket is positioned on the convex side.

3. The damping pocket of claim 1, wherein the bucket comprises a concave side and wherein the bucket comprises an undercut on the concave side.

4. The damping system of claim 3, wherein the undercut comprises an angled surface.

5. The damping system of claim 3, wherein the damper pin contacts both the damper pocket and the undercut when under centrifugal force.

6. The damping system of claim 1, wherein the damper pin comprises a leading boss and a trailing boss.

7. The damping system of claim 6, wherein the leading boss comprises a contact prong.

8. The damping system of claim 6, wherein the leading boss comprises a rounded crown.

9. The damping system of claim 6, wherein the trailing boss comprises a boss angled surface and a protrusion.

10. The damping system of claim 9, wherein the damper pocket comprises a pocket angled surface positioned about the boss angled surface.

11. A damping system for a turbine bucket, comprising:

a damper pocket; and

a damper pin positioned within the damper pocket;

wherein the damper pin comprises a leading boss and a trailing boss and wherein the leading boss comprises a rounded crown.

12. The damping system of claim 11, wherein the damper pin comprises an offset center of gravity.

13. The damping system of claim 11, wherein the bucket comprises a convex side and wherein the damper pocket is positioned on the convex side.

14. The damping pocket of claim 11, wherein the bucket comprises a concave side and wherein the bucket comprises an undercut on the concave side.

15. The damping system of claim 14, wherein the undercut comprises an angled surface.

16. The damping system of claim 14, wherein the damper pin contacts both the damper pocket and the undercut when under centrifugal force.

17. The damping system of claim 11, wherein the trailing boss comprises a boss angled surface and a protrusion.

18. The damping system of claim 17, wherein the damper pocket comprises a pocket angled surface positioned about the boss angled surface.

19. The damping system of claim 11, wherein the damper pin comprises a flat contact surface and a rounded contact surface.