TURBINE BLADE ASSEMBLY

• US 20120121423A1
• Filed: 11/11/2010
• Published: 05/17/2012
• Est. Priority Date: 11/11/2010
• Status: Active Grant

• Current Assignee: GE Infrastructure Technology, LLC (GE Vernova, Inc.)
• Original Assignee: General Electric Company
• Inventors: Honkomp, Mark Steven, Collier, Matthew Durham, Herzlinger, Jason Douglas
• Granted Patent: US 8,790,086 B2
• Time in Patent Office: Days
• US Class Current: 416/190
• 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: F05D 2260/96 Preventing, counteracting or reducing vibration or noise

Abstract

A turbine has blade assemblies disposed about a rotor. Each of the blade assemblies have an airfoil and a bucket. Pockets are defined at trailing and leading sides of the bucket, with damper pin slots at an ends thereof. The damper pin slot at the trailing side has a depth sufficient for fully receiving a damper pin. The damper pin slot at the trailing side of a first adjacent blade assembly is positioned relative to the damper pin slot at the leading side of a second adjacent blade assembly to allow the damper pin to move. At each side of the pocket at the trailing side is a seal pin slot with seal pins therein. The seal pin slots extend beyond a line that is aligned with an inner edge of the damper pin slot at the trailing side, wherein the seal pins overlap the damper pin.

Claims

1. A turbine having at least two adjacent blade assemblies circumferentially disposed about a rotor of the turbine, the turbine comprising:

each of the at least two adjacent blade assemblies having;

a bucket having a platform with a first pocket defined at a trailing side of the bucket and a second pocket defined at a leading side of the bucket, the bucket further having a first damper pin slot at one end of the first pocket and a second damper pin slot at one end of the second pocket, and

an airfoil projecting into a stream of the turbine, whereby kinetic energy of the stream is converted into mechanical energy through rotation of the rotor, the airfoil extending outwardly from the platform; and

a damper pin received in at least one of (i) the first damper pin slot of a first of the at least two adjacent blade assemblies and (ii) the second damper pin slot of a second of the at least two adjacent blade assemblies, the first damper pin slot of the first of the at least two adjacent blade assemblies is positioned relative to the second damper pin slot of the second of the at least two adjacent blade assemblies to allow the damper pin to move within the first damper pin slot of the first of the at least two adjacent blade assemblies and the second damper pin slot of the second of the at least two adjacent blade assemblies, the first damper pin slot has a depth sufficient for fully receiving the damper pin therein.

2. The turbine of claim 1 wherein the second damper pin slot has a depth sufficient for partially receiving the damper pin therein.

3. The turbine of claim 1 further comprising:

at each side of at least one of (i) the first pocket of the first of the at least two adjacent blade assemblies and (ii) the second pocket of the second of the at least two adjacent blade assemblies is a seal pin slot; and

seal pins received in the seal pin slots.

4. The turbine of claim 3 wherein:

each of the seal pin slots has a depth sufficient for fully receiving one of the seal pins therein.

5. The turbine of claim 3 wherein the seal pin slots extend beyond a line that is aligned with an edge of at least one of the first damper pin slot and the second damper pin slot, wherein the seal pins overlap the damper pin.

6. The turbine of claim 1 wherein each of the at least two adjacent blade assemblies further has shank portions depending from the platform, the shank portions define the first and second pockets.

7. The turbine of claim 6 wherein each of the at least two adjacent blade assemblies further has an interlocking connector portion extending from the shank portions, the interlocking connector portion being configured to be received in an opening in the rotor.

8. The turbine of claim 7 wherein the interlocking connector portion is a dovetail.

9. The turbine of claim 1 wherein the first damper pin slot of the first of the at least two adjacent blade assemblies is positioned relative to the second damper pin slot of the second of the at least two adjacent blade assemblies by being skewed at an angle.

10. The turbine of claim 9 wherein the angle is about the same as an inner flow path angle of the turbine.

11. A blade assembly comprising:

a bucket having a platform with a pocket defined at one side of the bucket, the bucket further having a damper pin slot at one end of the pocket and a seal pin slot at each side of the pocket, the seal pin slots extend beyond a line that is aligned with an edge of the damper pin slot;

an airfoil extending outwardly from the platform;

seal pins received in the seal pin slots; and

a damper pin received in the damper pin slot, wherein the seal pins overlap the damper pin.

13. The blade assembly of claim 11 further comprising:

shank portions depending from the platform, the shank portions define the pocket.

14. The blade assembly of claim 13 wherein the blade assembly further comprising:

an interlocking connector portion extending from the shank portions, the interlocking connector portion being configured to be received in an opening in the rotor.

15. The turbine of claim 14 wherein the interlocking connector portion is a dovetail.

12. The blade assembly of claim 12 wherein each of the seal pin slots has a depth sufficient for fully receiving one of the seal pins therein.

16. A turbine having at least two adjacent blade assemblies circumferentially disposed about a rotor of the turbine, the turbine comprising:

each of the at least two adjacent blade assemblies having an airfoil projecting into a stream of the turbine, whereby kinetic energy of the stream is converted into mechanical energy through the rotation of the rotor, and a bucket having a platform with the airfoil extending outwardly therefrom;

a pocket defined at one side of the bucket of at least one of the at least two adjacent blade assemblies;

a damper pin slot at one end of the pocket;

at each of (i) one side of the pocket and (ii) one side of the bucket of the other one of the at least two adjacent blade assemblies is a seal pin slot, the seal pin slots are disposed at opposing sides of the pocket when the two blade assemblies are adjacent, the seal pin slots extend beyond a line that is aligned with an edge of the damper pin slot;

seal pins received in the seal pin slots; and

a damper pin received in the damper pin slot, wherein the seal pins overlap the damper pin.

17. The turbine of claim 16 wherein each of the seal pin slots has a depth sufficient for fully receiving one of the seal pins therein.

18. The turbine of claim 16 wherein the pocket is defined by shank portions depending from the platform.

19. The turbine of claim 18 further comprising:

an interlocking connector portion extending from the shank portions, the interlocking connector portion being configured to be received in an opening in the rotor.

20. The turbine of claim 16 wherein the pocket is defined at a trailing side.