# US 10,371,006 B2 · Maintenance method for gas turbine

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- Number: US 10,371,006 B2
- Document ID: US10371006B2
- Status: Granted
- Kind: B2
- Application number: 15/519,363
- Filed: 2014-11-19
- Published: 2017-08-24
- Granted: 2019-08-06
- Earliest claimed: 2014-11-19
- Assignees: Mitsubishi Hitachi Power Systems, Ltd.
- Applicants: Mitsubishi Hitachi Power Systems, Ltd.
- Inventors: Kohei Hidaka; Susumu Wakazono; Toshihiro Takeda; Scott Cloyd; Santo Scimeca
- Web page: https://patentgrep.com/patent/US10371006B2

## CPC

- F01D 25/162: {Bearing supports}
- F01D 11/003: {by packing rings; Mechanical seals}
- F01D 21/003: {Arrangements for testing or measuring (for measuring vibrations G01H)}
- F01D 25/16: Arrangement of bearings; Supporting or mounting bearings in casings (bearings per se F16C)
- F16C 17/03: with tiltably-supported segments, e.g. Michell bearings {(hydrostatic bearings with tiltably supported bearing pads F16C32/0666; made from a plurality of rods F16C33/26; with flexible leaves F16C17/024; hydrodynamic bearings with chambers F16C33/1075)}
- F16J 15/3268: Mounting of sealing rings
- F16J 15/3288: Filamentary structures, e.g. brush seals
- F05D 2220/32: in gas turbines
- F05D 2230/72: Maintenance
- F05D 2240/20: Rotors
- F05D 2240/50: Bearings
- F05D 2240/55: Seals
- F16C 2237/00: Repair or replacement
- F16C 2360/23: Gas turbine engines
- Y10T 29/49318: Repairing or disassembling
- Y10T 29/49718: Repairing
- Y10T 29/49719: Seal or element thereof
- Y10T 29/49721: with disassembling
- Y10T 29/49723: including reconditioning of part
- Y10T 29/49725: by shaping
- F01D: NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES (machines or engines for liquids F03; non-positive displacement pumps F04D)
- F16C: SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16J: PISTONS {(specially adapted for dampers F16F9/32)}; CYLINDERS; SEALINGS
- F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

An exhaust-side journal bearing for supporting a gas turbine rotor is disposed inside a bearing box. The bearing box is supported by a strut which extends inward from an exhaust casing, and a seal ring having an annular inner peripheral end is disposed on the bearing box. Executed during a maintenance work are: a bearing adjustment step of displacing a bearing surface of the journal bearing relative to the bearing box in a perpendicular direction perpendicular to the axial direction; and a seal ring adjustment step of displacing the inner peripheral end of the seal ring relative to the bearing box in accordance with the direction of displacement and the amount of displacement of the bearing surface.

## Claims

### Claim 1

A maintenance method for a gas turbine where a gas turbine exhaust-side journal bearing for supporting a gas turbine rotor is disposed in a bearing box, the bearing box is supported by a strut extending from an exhaust casing of the gas turbine toward the inside of the exhaust casing, and a seal ring which includes an annular inner peripheral end and seals between one side and the other side thereof in an axial direction of the gas turbine rotor is provided in the bearing box, the maintenance method comprising:
a bearing adjustment step of displacing a bearing surface of the journal bearing relative to the bearing box in a perpendicular direction that is perpendicular to the axial direction in which the gas turbine rotor extends; and
a seal ring adjustment step of displacing the inner peripheral end of the seal ring relative to the bearing box in accordance with the direction of displacement and the amount of displacement of the bearing surface.

### Claim 2 (depends on 1)

The maintenance method for a gas turbine according to claim 1,
wherein the journal bearing includes a pad on which the bearing surface is formed, and a bearing housing that supports the pad from an outer peripheral side, and
wherein the bearing adjustment step includes a thickness change step of changing the thickness in the perpendicular direction of at least one component of one or more components, including the pad, disposed between an outer peripheral side of the gas turbine rotor and an inner peripheral side of the bearing housing.

### Claim 3 (depends on 1)

The maintenance method for a gas turbine according to claim 1,
wherein the journal bearing includes a pad on which the bearing surface is formed, and a bearing housing that supports the pad from an outer peripheral side, and
wherein the bearing adjustment step includes an adjustment member-disposition step of disposing a bearing surface adjustment member between the pad and the bearing housing or changing the thickness of a bearing surface adjustment member, which is disposed in advance, in the perpendicular direction.

### Claim 4 (depends on 1)

The maintenance method for a gas turbine according to claim 1,
wherein the bearing adjustment step includes a thickness reduction step of cutting the bearing surface of the journal bearing.

### Claim 5 (depends on 1)

The maintenance method for a gas turbine according to claim 1,
wherein the bearing adjustment step includes a bearing position change step of changing the position of the journal bearing relative to the bearing box in the perpendicular direction.

### Claim 6 (depends on 1)

The maintenance method for a gas turbine according to claim 1,
wherein an annular outer peripheral end is formed on an outer peripheral side of the annular inner peripheral end of the seal ring, and
wherein the seal ring adjustment step includes an inner peripheral end-machining step of machining the seal ring so that the center of the annular inner peripheral end is eccentric to the center of the annular outer peripheral end.

### Claim 7 (depends on 6)

The maintenance method for a gas turbine according to claim 6,
wherein in the inner peripheral end machining step, a part of the inner peripheral end is extended toward an inner peripheral side and another part of the inner peripheral end is cut.

### Claim 8 (depends on 1)

The maintenance method for a gas turbine according to claim 1,
wherein the seal ring adjustment step includes a seal ring position change step of changing the position of the seal ring relative to the bearing box in the perpendicular direction.

### Claim 9 (depends on 1)

The maintenance method for a gas turbine according to claim 1, further comprising:
a displacement measurement step of measuring the amount of displacement and the direction of displacement of an actual position of the gas turbine rotor in the perpendicular direction at the bearing position with reference to a predetermined position of the gas turbine rotor in the perpendicular direction at the bearing position in the axial direction,
wherein in the bearing adjustment step, the bearing surface of the journal bearing is displaced relative to the bearing box according to the amount of displacement in a direction opposite to the direction of displacement, and
wherein in the seal ring adjustment step, the inner peripheral end of the seal ring is displaced relative to the bearing box according to the amount of displacement in a direction opposite to the direction of displacement.