METHOD FOR PULLING A BEARING BODY OFF THE ROTOR OF A GAS TURBINE AND TUBULAR SHAFT EXTENSION

• US 20130315714A1
• Filed: 01/05/2012
• Published: 11/28/2013
• Est. Priority Date: 02/09/2011
• Status: Active Grant

• Current Assignee: Siemens Energy Global GmbH & Co. KG (Siemens AG)
• Original Assignee: Dirk Muller
• Inventors: Mller, Dirk
• Granted Patent: US 9,638,106 B2
• Time in Patent Office: Days
• US Class Current: 415/122.1
• CPC Class Codes: B25B 27/06 inserting or withdrawing sleeves or bearing races
• CPC Class Codes: F01D 25/285 Temporary support structures, e.g. for testing, assembling, installing, repairing; Assembly methods using such structures
• CPC Class Codes: F02C 7/36 Power transmission arrangements between the different shafts of the gas turbine plant, or between the gas-turbine plant and the power user F02C3/107 - F02C3/13 and F02C7/32 take precedence; couplings for transmitting rotation F16D; gearing in general F16H
• CPC Class Codes: F05D 2230/70 Disassembly methods
• CPC Class Codes: F05D 2240/50 Bearings
• CPC Class Codes: F16C 2360/23 Gas turbine engines in general F02C
• CPC Class Codes: F16C 35/00 Rigid support of bearing units; Housings, e.g. caps, covers F16C23/00 takes precedence
• CPC Class Codes: Y10T 29/49318 Repairing or disassembling

Abstract

A method is provided for pulling a bearing body off the rotor of a gas turbine having a casing, while the casing is closed. The method includes fixing a shaft extension on the relevant end of the rotor. In order to free the bearing body of the weight of the rotor, the method involves supporting the rotor and/or holding the rotor. The method further includes fitting sliding elements between the bearing body and the rotor, and moving the bearing body axially along the machine axis onto the shaft extension.

Claims

1-11. -11. (canceled)

12. A method for pulling a bearing body off the rotor of a gas turbine having a casing, while the casing is closed, the method comprising:

fixing a shaft extension on the relevant end of the rotor, and

supporting the rotor and/or

holding the rotor

in order to free the bearing body of the weight of the rotor,

fitting sliding elements between the bearing body and the rotor, and

moving the bearing body axially along the machine axis onto the shaft extension.

13. The method as claimed in claim 12,

wherein the bearing body is of undivided configuration in the circumferential direction.

14. The method as claimed in claim 12, further comprising:

securing the bearing body against rotation during and after axial movement with the aid of an anti-rotation device.

15. The method as claimed in claim 14, further comprising:

providing at least one guide extending in the axial direction as an anti-rotation device on the shaft extension, the guide limiting the tangential movement of a pin fixed on the bearing body when there is a risk of rotary motion of the bearing body.

16. The method as claimed in claim 15,

wherein the guide is embodied as a U-profile, along the outward-facing web of which the pin can slide with a small clearance.

17. The method as claimed in claim 15,

wherein the guide is embodied as a flat profile, the flat side of which extends perpendicularly to the radius of the shaft extension and parallel to the machine axis.

18. The method as claimed in claim 12,

wherein the shaft extension is screwed onto the end of the rotor.

19. The method as claimed in claim 18, further comprising:

aligning the shaft extension relative to the rotor with the aid of a roller bracket to enable it to be screwed onto the rotor without misalignment.

20. The method as claimed in claim 18, further comprising:

positioning and securing shaft extension which is screwed onto the rotor against rotation with the aid of a locknut.

21. The method as claimed in claim 12, further comprising:

supporting the bearing body on the rotor or the extension thereof at two axial positions via the sliding elements.

22. The method as claimed in claim 12,

wherein the gas turbine is a stationary gas turbine.

23. The method as claimed in claim 12,

wherein the casing is configured such that it can be divided into halves.

24. A tubular shaft extension for releasing a bearing body of a rotor of a stationary gas turbine having a casing, the shaft extension comprising:

an internal thread at one end for screwing the shaft extension onto one end of the rotor of the gas turbine, and

at least one guide arranged on the outside of the shaft extension, for forming one of two mating parts of an anti-rotation device for the bearing body, which is movable along the shaft extension.

25. The shaft extension as claimed in claim 24,

wherein the guide is embodied as a U-profile which extends along the shaft extension and the web of which faces outward.

26. The shaft extension as claimed in claim 24,

wherein the gas turbine is a stationary gas turbine.

27. The shaft extension as claimed in claim 24,

wherein the casing is configured such that it can be divided into halves.