Turbine bucket damper pin

• US 6,776,583 B1
• Filed: 02/27/2003
• Issued: 08/17/2004
• Est. Priority Date: 02/27/2003
• Status: Expired due to Fees

• Current Assignee: General Electric Company
• Original Assignee: General Electric Company
• Inventors: Kellock, Iain Robertson, Wang, John Zhiqiang, Sims, Calvin L., Scaeffer, Jon Conrad
• Primary Examiner(s): Nguyen, Ninh H.
• Application Number:
  US10/373,757
• Time in Patent Office: 537 Days
• Field of Search: 416/500, 416/220.R, 416/248, 298/892
• US Class Current: 416/220.00R
• CPC Class Codes: F01D 11/006 Sealing the gap between rotor blades or blades and rotor
• 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 2230/60 Assembly methods
• CPC Class Codes: F05D 2250/291 hollowed
• CPC Class Codes: Y10S 416/50 Vibration damping features

Abstract

A damper pin for a bucket damper slot in a turbine includes slot insertion ends shaped to fit into the bucket damper slot, and at least a first scallop section formed or machined between the slot insertion ends and shaped to receive a bucket shank pocket radial contour at bucket Hi-C. A second scallop section may also be formed or machined diametrically opposed and anti-symmetrical to the first scallop section between the slot insertion ends.

Claims

1. A damper pin for a bucket damper slot in a turbine, the damper pin comprising:

slot insertion ends shaped to fit into the bucket damper slot; and

a first scallop section formed between the slot insertion ends and shaped to receive a bucket shank pocket radial contour at bucket Hi-C.

2. A damper pin according to claim 1, further comprising a second scallop section formed diametrically opposed and anti-symmetrical to the first scallop section between the slot insertion ends, the second scallop section being shaped to receive the bucket shank pocket radial contour at bucket HI-C.

3. A damper pin according to claim 2, wherein the first and second scallop sections are substantially U-shaped.

4. A damper pin according to claim 3, wherein a center of the first scallop section and a center of the second scallop section are substantially flat planes.

5. A damper pin according to claim 4, wherein a trough face of the first scallop section and a trough face of the second scallop section are substantially parallel to the bucket shank pocket radial contour within manufacturing and assembly tolerances.

6. A damper pin according to claim 1, wherein the first scallop section is substantially U-shaped.

7. A damper pin according to claim 6, wherein a center of the first scallop section is a substantially flat plane.

8. A damper pin according to claim 7, wherein a trough face of the first scallop section is substantially parallel to the bucket shank pocket radial contour within manufacturing and assembly tolerances.

9. A method of constructing a damper pin for a bucket damper slot in a turbine, the method comprising:

(a) forming slot insertion ends shaped to fit into the bucket damper slot; and

(b) machining a first scallop section between the slot insertion ends, the first scallop section being shaped to receive a bucket shank pocket radial contour at bucket Hi-C.

10. A method according to claim 9, further comprising (c) machining a second scallop section diametrically opposed and anti-symmetrical to the first scallop section between the slot insertion ends, the second scallop section being shaped to receive the bucket shank pocket radial contour at bucket HI-C.

11. A method according to claim 10, wherein steps (b) and (c) are practiced by machining the first and second scallop sections to be substantially U-shaped.

12. A method according to claim 11, wherein steps (b) and (c) are practiced by machining a center of the first scallop section and a center of the second scallop section to be substantially flat planes.

13. A method according to claim 12, wherein steps (b) and (c) are practiced by machining a trough face of the first scallop section and a trough face of the second scallop section to be substantially parallel to the bucket shank pocket radial contour within manufacturing and assembly tolerances.

14. A method according to claim 9, wherein step (b) is practiced by machining the first scallop section to be substantially U-shaped.

15. A method according to claim 14, wherein step (b) is practiced by machining a center of the first scallop section to be a substantially flat plane.

16. A method according to claim 15, wherein step (b) is practiced by machining a trough face of the first scallop section to be substantially parallel to the bucket shank pocket radial contour within manufacturing and assembly tolerances.

17. A damper pin for a bucket damper slot in a turbine, the damper pin comprising:

slot insertion ends shaped to fit into the bucket damper slot;

a first scallop section machined between the slot insertion ends; and

a second scallop section machined diametrically opposed and anti-symmetrical to the first scallop section between the slot insertion ends, the first and second scallop sections being shaped to receive the bucket shank pocket radial contour at bucket HI-C.