EP2218947A1 - Rotor pour une turbomachine doté d'un joint d'étanchéité et procédé destiné à la réparation du rotor - Google Patents

Rotor pour une turbomachine doté d'un joint d'étanchéité et procédé destiné à la réparation du rotor Download PDF

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Publication number
EP2218947A1
EP2218947A1 EP09002138A EP09002138A EP2218947A1 EP 2218947 A1 EP2218947 A1 EP 2218947A1 EP 09002138 A EP09002138 A EP 09002138A EP 09002138 A EP09002138 A EP 09002138A EP 2218947 A1 EP2218947 A1 EP 2218947A1
Authority
EP
European Patent Office
Prior art keywords
shaft seal
shaft
groove
rotor
rotor according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP09002138A
Other languages
German (de)
English (en)
Inventor
Uwe Zander
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Priority to EP09002138A priority Critical patent/EP2218947A1/fr
Publication of EP2218947A1 publication Critical patent/EP2218947A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
    • F01D11/02—Preventing or minimising internal leakage of working-fluid, e.g. between stages by non-contact sealings, e.g. of labyrinth type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
    • F01D5/02—Blade-carrying members, e.g. rotors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2260/00—Function
    • F05B2260/30—Retaining components in desired mutual position
    • F05B2260/301—Retaining bolts or nuts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2230/00—Manufacture
    • F05D2230/50—Building or constructing in particular ways
    • F05D2230/51—Building or constructing in particular ways in a modular way, e.g. using several identical or complementary parts or features
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2230/00—Manufacture
    • F05D2230/80—Repairing, retrofitting or upgrading methods
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2240/00—Components
    • F05D2240/40—Use of a multiplicity of similar components
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2250/00—Geometry
    • F05D2250/30—Arrangement of components
    • F05D2250/33—Arrangement of components symmetrical

Definitions

  • the invention relates to a rotor for a turbomachine, wherein a shaft seal is provided on the rotor, and a method for repairing the rotor and a method for the subsequent enlargement of the outer diameter of the rotor.
  • a turbomachine for example a steam turbine, has a housing and a rotor, which is rotatably mounted in the housing.
  • the rotor has a shaft which is mounted at its longitudinal ends, each with a bearing which is provided outside the housing. Since the shaft moves relative to the housing during operation of the steam turbine, a radial gap is provided between the shaft and the housing so that the shaft can not touch the housing. The radial gap causes a leakage flow due to the overpressure of the steam within the housing. It is desirable to seal this radial gap as effectively as possible, so that the leakage is minimized.
  • a non-contact labyrinth seal is provided in the radial gap to reduce the leakage, for example.
  • the width of the radial gap is essentially constant over time. It is desirable that the labyrinth seal has the strongest possible sealing effect, so that the efficiency of the steam turbine is high.
  • the width of the radial gap can change, with the intention of preventing the labyrinth seal from rubbing against it.
  • the steam turbine is used to generate electricity in a steam power plant.
  • the high thermal efficiency of the modern steam power plant is based on extreme steam parameters, the handling of which reaches its limits, in particular in the steam turbine. So it is often necessary that in such steam turbines near the entrance of the use of resistant materials is necessary.
  • an increase in the radial clearance would have to be made in the labyrinth in order to prevent any bridging of the game and its dynamic self-amplification.
  • the lifting of the radial gaps is particularly harmful in the piston region of the steam turbine, since this results in particularly high, proportionate Radialspaltmanne.
  • the rotor is conventionally the formation of the shaft seal by tightening of sealing tips or caulking of sealing strips.
  • the type of shaft seal for example, a labyrinth gland seal or a tip-to-tip seal
  • consideration must be given to the chosen material combination between the rotor and the adjacent stationary area.
  • the selected material pairing can only have the properties "high thermal-mechanical strength with poor run-in behavior” or "lower strength with good run-in behavior".
  • the object of the invention is to provide a rotor for a turbomachine with a shaft seal and a method for repairing the rotor and a method for subsequent enlargement of the outer diameter of the rotor, wherein the shaft seal has a high strength and a low leakage rate.
  • the turbomachine rotor comprises a shaft and a shaft seal sleeve mounted on the outer circumference of the shaft seal shaft together with a shaft seal bushing of the turbomachine, the shaft seal sleeve having a shaft seal ring formed by a plurality of circumferentially juxtaposed segments is, each having a circumferentially extending base plate and radially inwardly mounted thereon having a circumferentially extending web, which is in such a form-fitting manner with a groove provided in the surface of the shaft that the foot plate radially and axially fixed to the shaft is as well as covering the surface of the shaft, wherein the foot plate is arranged facing this to cooperate with the shaft seal sleeve.
  • the shaft seal ring and the rotor are provided as separate components for the turbomachine, individual materials can be selected for the shaft seal ring and the rotor.
  • the material for the shaft seal a unfavorable in terms of running-in behavior of material pairing with the shaft seal bushing can be avoided.
  • the rotor is made of a material which has a high strength but a poor run-in behavior, which is compensated by the fact that the shaft seal ring is made of a material with a good shrink-in behavior.
  • an unfavorable material pairing with regard to the running-in behavior can be avoided in the case of potential radial rubbing in the shaft seal and therefore any radial play allowance that may be required.
  • the heat input into the rotor is advantageously limited when rubbed, so that a curvature of the rotor caused thereby is prevented.
  • the heat input is initially limited to the shaft seal, so that any damage to the material of the rotor is prevented.
  • the shaft seal acts both as a thermal buffer to the underlying rotor and as an exchangeable "sacrificial layer,” thereby avoiding major damage to the rotor, such as residual curvatures or cures.
  • the method of repairing the rotor according to the invention comprises the steps of: removing the segments of the groove of the shaft which are defective; Installation of new segments to replace the defective segments. This creates a concept for the repair (backup) solution for rubbing damage in shaft seal areas, since otherwise required radial twisting of the outer shaft end areas can be compensated by a corresponding adjustment of the height of the base plate of the shaft seal ring.
  • a method for subsequently enlarging the outside diameter of the shaft in the area of the shaft seal comprises the steps of: manufacturing a circumferential groove in the shaft in the area of the shaft seal; Manufacturing a plurality of segments of a shaft seal ring, wherein the thickness of the foot plate is defined by the difference of the outside diameter of the shaft in the area of the shaft seal and the outside diameter after the enlargement; Insert the segments into the groove.
  • the cross section of the web is preferably formed hammerhead-shaped and the groove is preferably formed as a T-slot.
  • the radial outer surface of the base plate is preferably formed such that the shaft seal sleeve with the shaft seal bushing forms a full maze shaft seal or a see-through shaft seal or a tip-to-tip shaft seal or a comb-groove shaft seal.
  • a sealing strip material is preferably pressed into the surface of the radial outer surface of the base plate.
  • an integrated sealing tape is milled.
  • the groove forming the positive locking with the segments is provided with a widening at a position on the circumference of the shaft such that each segment can be inserted through the widening in this groove.
  • the groove is preferably determined in its radial extent such that the segment inserted in the groove has a radial play. In this case, it is preferred that in the groove the segment is secured by understitching.
  • the shaft seal sleeve having a plurality of shaft seal rings, which are axially adjacent to the outer circumference of the shaft attached, whereby by the plurality of shaft seal rings, the shaft seal sleeve is formed.
  • the shaft seal rings are preferably dimensioned identically and are preferably adjacent to one another in such a way that the radially outer surface of the foot plates forms the radial outer surface of the shaft seal sleeve.
  • the segments are made of a material which has a favorable squeal behavior when, during operation of the turbomachine, the shaft seal bushing or sealing elements attached to it, e.g. Dense tips, strikes the shaft seal sleeve.
  • a turbomachine 1 has a rotor 2 with a shaft 3.
  • the shaft 3 has a shaft end 4 on which a shaft seal 5 is provided, which has a shaft seal bushing 6 and the shaft seal sleeve 7.
  • the shaft seal bushing 6 is installed stationary in a housing of the turbomachine 1, whereas the shaft seal sleeve 7 is formed on the shaft end 4.
  • the shaft seal sleeve 7 has a plurality of shaft seal rings 8, which are arranged axially adjacent to one another on the shaft end 4.
  • Each shaft seal ring 8 is divided in the circumferential direction into a plurality of segments 9.
  • Each segment 9 has radially outwardly a foot plate 10 which is formed as a flat ring segment and is radially outwardly formed with the shaft seal bushing 6 for forming the shaft seal.
  • a web 11 is provided, which is formed hammer head-shaped in its cross section.
  • a plurality of circumferential T-slots 12 is provided, wherein in each T-groove 12 of the shaft seal rings 8 is inserted.
  • the shape of the cross section of the T-groove 12 is matched to the cross section of each segment 9, that in the T-groove 12 of the web is arranged positively and the base plate 10 rests on the shaft end 4.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
EP09002138A 2009-02-16 2009-02-16 Rotor pour une turbomachine doté d'un joint d'étanchéité et procédé destiné à la réparation du rotor Withdrawn EP2218947A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP09002138A EP2218947A1 (fr) 2009-02-16 2009-02-16 Rotor pour une turbomachine doté d'un joint d'étanchéité et procédé destiné à la réparation du rotor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP09002138A EP2218947A1 (fr) 2009-02-16 2009-02-16 Rotor pour une turbomachine doté d'un joint d'étanchéité et procédé destiné à la réparation du rotor

Publications (1)

Publication Number Publication Date
EP2218947A1 true EP2218947A1 (fr) 2010-08-18

Family

ID=41056726

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09002138A Withdrawn EP2218947A1 (fr) 2009-02-16 2009-02-16 Rotor pour une turbomachine doté d'un joint d'étanchéité et procédé destiné à la réparation du rotor

Country Status (1)

Country Link
EP (1) EP2218947A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2538032A1 (fr) * 2011-06-22 2012-12-26 Siemens Aktiengesellschaft Système d'étanchéité mobile radialement pour une turbine à gaz

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE348547A (fr) *
GB127235A (en) * 1918-05-24 1919-07-10 British Westinghouse Electric Improvements relating to Packing for Rotary Shafts, Turbine Dummy Pistons and the like.
US1792288A (en) * 1929-04-24 1931-02-10 Gen Electric Elastic-fluid machine
US2020986A (en) * 1934-04-20 1935-11-12 Westinghouse Electric & Mfg Co Packing
DE1426785A1 (de) * 1964-05-11 1969-03-13 Aeg Kanis Turbinen Labyrinthstopfbuchse fuer Turbomaschinen
US5080556A (en) * 1990-09-28 1992-01-14 General Electric Company Thermal seal for a gas turbine spacer disc
WO2002023069A2 (fr) * 2000-09-14 2002-03-21 Turbocare, Inc. Joint a brosse toroidale eventuellement placee dans une presse-garniture a labyrinthe
GB2397353A (en) * 2003-01-18 2004-07-21 Rolls Royce Plc A sealing arangement for a labyrinth seal for a shaft
EP1486643A2 (fr) * 1997-07-31 2004-12-15 Kabushiki Kaisha Toshiba Système de refroidissement pour le rotor d'une turbine à gaz

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE348547A (fr) *
GB127235A (en) * 1918-05-24 1919-07-10 British Westinghouse Electric Improvements relating to Packing for Rotary Shafts, Turbine Dummy Pistons and the like.
US1792288A (en) * 1929-04-24 1931-02-10 Gen Electric Elastic-fluid machine
US2020986A (en) * 1934-04-20 1935-11-12 Westinghouse Electric & Mfg Co Packing
DE1426785A1 (de) * 1964-05-11 1969-03-13 Aeg Kanis Turbinen Labyrinthstopfbuchse fuer Turbomaschinen
US5080556A (en) * 1990-09-28 1992-01-14 General Electric Company Thermal seal for a gas turbine spacer disc
EP1486643A2 (fr) * 1997-07-31 2004-12-15 Kabushiki Kaisha Toshiba Système de refroidissement pour le rotor d'une turbine à gaz
WO2002023069A2 (fr) * 2000-09-14 2002-03-21 Turbocare, Inc. Joint a brosse toroidale eventuellement placee dans une presse-garniture a labyrinthe
GB2397353A (en) * 2003-01-18 2004-07-21 Rolls Royce Plc A sealing arangement for a labyrinth seal for a shaft

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2538032A1 (fr) * 2011-06-22 2012-12-26 Siemens Aktiengesellschaft Système d'étanchéité mobile radialement pour une turbine à gaz

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