EP0705958A1 - Abschrägung der Tragflächen eines Tannenbaumfusses für Turbinenschaufeln zur Spannungsverminderung - Google Patents

Abschrägung der Tragflächen eines Tannenbaumfusses für Turbinenschaufeln zur Spannungsverminderung Download PDF

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Publication number
EP0705958A1
EP0705958A1 EP95402163A EP95402163A EP0705958A1 EP 0705958 A1 EP0705958 A1 EP 0705958A1 EP 95402163 A EP95402163 A EP 95402163A EP 95402163 A EP95402163 A EP 95402163A EP 0705958 A1 EP0705958 A1 EP 0705958A1
Authority
EP
European Patent Office
Prior art keywords
root
zone
notch
fin
stress
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.)
Granted
Application number
EP95402163A
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English (en)
French (fr)
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EP0705958B1 (de
Inventor
Pierre Bourcier
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.)
Alstom SA
Original Assignee
GEC Alsthom Electromecanique SA
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Publication date
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Publication of EP0705958A1 publication Critical patent/EP0705958A1/de
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Publication of EP0705958B1 publication Critical patent/EP0705958B1/de
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Expired - Lifetime 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
    • F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
    • F01D5/30—Fixing blades to rotors; Blade roots ; Blade spacers
    • F01D5/3007—Fixing blades to rotors; Blade roots ; Blade spacers of axial insertion type

Definitions

  • the present invention relates to an arrangement for the clipping of stress points in the anchoring of a turbine fin, comprising a root known as a Fir-Tree root comprising notches, in a groove of corresponding profile on a disc.
  • a known assembly of steam turbine fins on a rotor disc consists in that each fin comprises at its base a foot or an anchoring root in the rotor disc.
  • This root is called "Pied-sapin” and the envelope of its profile forms an isosceles trapezium whose large base is closest to the base of the fin and the small base moves away from it. Its exact profile, from this envelope, includes a series of narrowing called “collars". The part of the profile between two passes is called "a notch".
  • the rotor disc On a fin root, there can be 3 to 5 notches.
  • the rotor disc carries a series of grooves for mounting the fins. Each groove has a profile complementary to the so-called "Fir-tree" profile of the roots of the fins.
  • the present invention aims to reduce these stress peaks.
  • the subject of the invention is therefore a provision for the clipping of stress points in the anchoring of a turbine fin, comprising a root known as a "Fir-tree" comprising notches in a corresponding profile groove on a disc, characterized in that the profile of each notch on the upper surface side of the root of the fin is such that the clearance for mounting the root in its groove on the side upper surface, is not uniform but comprises at least one zone where this play follows an evolution, this zone corresponding to a zone of the notch considered where, in the case of an assembly with constant play all along said notch, nominal speed of rotation of the disc equipped with its fins, a stress point relative to the average stress along the notch, the evolution of said clearance along a said zone evolving in the same direction as said stress point.
  • said zone is located on the side of the trailing edge. This results, during the machining of the notches of the root, by a deeper machining of the notch in said zone, for example by modification of the angle of the trajectory of the milling cutter for a rectilinear root or by reduction of the radius of curvature of the path of the milling cutter for a curved root.
  • FIG. 1 shows a fin 1 of a steam turbine comprising a root 2 in "Fir-base” comprising a plurality of notches such as 3.
  • the fin has a leading edge 4 which is the side where between the steam and a trailing edge 5.
  • the fins such as 1 are threaded through their roots 2 into grooves of complementary geometry formed in a rotor disk of the turbine.
  • FIG. 2 represents the stress curve c which exists, during nominal rotation of the disc, along a notch of the root of the fin between the side E corresponding to the leading edge of the fin and that S corresponding to its trailing edge.
  • Figure 3 shows the root 2 of a fin 1 in a groove 6 of the rotor disk 7 of a turbine.
  • the side marked A corresponds to the lower side and the side marked B corresponds to the upper side.
  • the root of the fin shown has four notches 3A, 3B, 3C and 3D.
  • This figure 3 shows the root in section by a plane perpendicular to the axis of the disc 7 and on the side of the root corresponding to the trailing edge of the fin, that is to say there corresponding to the trailing edge of the fin, that is to say where a stress point usually occurs in the notches.
  • the line marked 8 in FIG. 4 represents the plane corresponding to the section of the root 2 represented in this FIG. 3.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
EP95402163A 1994-09-30 1995-09-27 Abschrägung der Tragflächen eines Tannenbaumfusses für Turbinenschaufeln zur Spannungsverminderung Expired - Lifetime EP0705958B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9411724 1994-09-30
FR9411724A FR2725239B1 (fr) 1994-09-30 1994-09-30 Disposition pour l'ecretement des pointes de contrainte dans l'ancrage d'une ailette de turbine, comportant une racine dite en "pied-sapin"

Publications (2)

Publication Number Publication Date
EP0705958A1 true EP0705958A1 (de) 1996-04-10
EP0705958B1 EP0705958B1 (de) 1998-10-21

Family

ID=9467468

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95402163A Expired - Lifetime EP0705958B1 (de) 1994-09-30 1995-09-27 Abschrägung der Tragflächen eines Tannenbaumfusses für Turbinenschaufeln zur Spannungsverminderung

Country Status (5)

Country Link
US (1) US5567116A (de)
EP (1) EP0705958B1 (de)
JP (1) JPH08105301A (de)
DE (1) DE69505479T2 (de)
FR (1) FR2725239B1 (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0799972A1 (de) * 1996-04-02 1997-10-08 ROLLS-ROYCE plc Befestigung einer Turbomaschinenschaufel
WO1997049921A1 (de) * 1996-06-21 1997-12-31 Siemens Aktiengesellschaft Rotor für eine turbomaschine mit in nuten anbringbaren schaufeln sowie schaufel für einen rotor
WO2007133204A1 (en) 2006-05-12 2007-11-22 General Electric Company BLADE/DISK DOVETAIL BACKCUT FOR BLADE/DISK STRESS REDUCTION (6FA+e, STAGE 2)
EP1882085A2 (de) * 2005-05-12 2008-01-30 General Electric Company Klingen/scheiben-zinkenrückschnitt zur klingen/scheiben-belastungsreaktion (7fa+e, stufe 2)
EP1882084A2 (de) * 2005-05-12 2008-01-30 General Electric Company Stutzung der zinken einer schaufel oder einer scheibe zur reduktion der belastung der schaufel bzw. der scheibe (9fa+e, stufe 2)
EP3144480A1 (de) * 2015-09-15 2017-03-22 General Electric Company Ausnehmung im laufschaufelfuss zur spannungsverminderung

Families Citing this family (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19705323A1 (de) * 1997-02-12 1998-08-27 Siemens Ag Reduzierung von lokalen Spannungen in Schaufelfußnuten
US6439851B1 (en) * 2000-12-21 2002-08-27 United Technologies Corporation Reduced stress rotor blade and disk assembly
US7007382B2 (en) * 2003-07-24 2006-03-07 United Technologies Corporation Slot machining
US7153102B2 (en) * 2004-05-14 2006-12-26 Pratt & Whitney Canada Corp. Bladed disk fixing undercut
US7156621B2 (en) * 2004-05-14 2007-01-02 Pratt & Whitney Canada Corp. Blade fixing relief mismatch
JP4918806B2 (ja) * 2006-04-06 2012-04-18 株式会社日立製作所 タービンロータ及びタービン動翼
US20090208339A1 (en) * 2008-02-15 2009-08-20 United Technologies Corporation Blade root stress relief
US9174292B2 (en) * 2008-04-16 2015-11-03 United Technologies Corporation Electro chemical grinding (ECG) quill and method to manufacture a rotor blade retention slot
CN101285401B (zh) * 2008-06-03 2010-06-02 东方电气集团东方汽轮机有限公司 枞树型叶根汽轮机动叶片及其锁口叶片
US7846010B2 (en) * 2008-09-10 2010-12-07 United Technologies Corporation Notched grind wheel and method to manufacture a rotor blade retention slot
JP5395455B2 (ja) * 2009-02-20 2014-01-22 三菱重工業株式会社 軸流圧縮機用動翼
US9151167B2 (en) * 2012-02-10 2015-10-06 General Electric Company Turbine assembly
US8974188B2 (en) 2012-03-06 2015-03-10 Hamilton Sundstrand Corporation Blade clip
US10072507B2 (en) 2012-10-25 2018-09-11 United Technologies Corporation Redundant airfoil attachment
US9739158B2 (en) 2013-03-10 2017-08-22 Rolls-Royce Corporation Attachment feature of a gas turbine engine blade having a curved profile
US9945389B2 (en) 2014-05-05 2018-04-17 Horton, Inc. Composite fan
CN104018888A (zh) * 2014-06-23 2014-09-03 中国船舶重工集团公司第七0四研究所 用于叶片周向安装的外包枞树型叶根
US10731484B2 (en) 2014-11-17 2020-08-04 General Electric Company BLISK rim face undercut
US20170356297A1 (en) * 2016-06-13 2017-12-14 General Electric Company Lockwire Tab Backcut For Blade Stress Reduction (9E.04)
US10895160B1 (en) * 2017-04-07 2021-01-19 Glenn B. Sinclair Stress relief via unblended edge radii in blade attachments in gas turbines

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1482308A (en) 1974-10-29 1977-08-10 Westinghouse Electric Corp Turbine rotating blade
GB2064667A (en) * 1979-11-30 1981-06-17 United Technologies Corp Turbofan rotor blades
GB2271817A (en) * 1992-10-21 1994-04-27 Snecma Turbomachine rotor.
FR2712631A1 (fr) * 1993-11-19 1995-05-24 Gen Electric Ailette de rotor et ensemble ailettes-disque de rotor comportant une telle ailette.

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB677142A (en) * 1949-08-24 1952-08-13 Power Jets Res & Dev Ltd Improved mounting for turbine and like blades
GB2238581B (en) * 1989-11-30 1994-01-12 Rolls Royce Plc Improved attachment of a gas turbine engine blade to a turbine rotor disc
US5141401A (en) * 1990-09-27 1992-08-25 General Electric Company Stress-relieved rotor blade attachment slot

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1482308A (en) 1974-10-29 1977-08-10 Westinghouse Electric Corp Turbine rotating blade
GB2064667A (en) * 1979-11-30 1981-06-17 United Technologies Corp Turbofan rotor blades
GB2271817A (en) * 1992-10-21 1994-04-27 Snecma Turbomachine rotor.
FR2712631A1 (fr) * 1993-11-19 1995-05-24 Gen Electric Ailette de rotor et ensemble ailettes-disque de rotor comportant une telle ailette.

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0799972A1 (de) * 1996-04-02 1997-10-08 ROLLS-ROYCE plc Befestigung einer Turbomaschinenschaufel
WO1997049921A1 (de) * 1996-06-21 1997-12-31 Siemens Aktiengesellschaft Rotor für eine turbomaschine mit in nuten anbringbaren schaufeln sowie schaufel für einen rotor
US6065938A (en) * 1996-06-21 2000-05-23 Siemens Aktiengesellschaft Rotor for a turbomachine having blades to be fitted into slots, and blade for a rotor
EP1882085A2 (de) * 2005-05-12 2008-01-30 General Electric Company Klingen/scheiben-zinkenrückschnitt zur klingen/scheiben-belastungsreaktion (7fa+e, stufe 2)
EP1882084A2 (de) * 2005-05-12 2008-01-30 General Electric Company Stutzung der zinken einer schaufel oder einer scheibe zur reduktion der belastung der schaufel bzw. der scheibe (9fa+e, stufe 2)
EP1882084A4 (de) * 2005-05-12 2013-06-26 Gen Electric Stutzung der zinken einer schaufel oder einer scheibe zur reduktion der belastung der schaufel bzw. der scheibe (9fa+e, stufe 2)
EP1882085A4 (de) * 2005-05-12 2013-06-26 Gen Electric Klingen/scheiben-zinkenrückschnitt zur klingen/scheiben-belastungsreaktion (7fa+e, stufe 2)
WO2007133204A1 (en) 2006-05-12 2007-11-22 General Electric Company BLADE/DISK DOVETAIL BACKCUT FOR BLADE/DISK STRESS REDUCTION (6FA+e, STAGE 2)
EP2019913A1 (de) * 2006-05-12 2009-02-04 General Electric Company Schaufel/scheiben-schwalbenschwanzhinterschnitt für schaufel/scheiben-spannungsreduzierung (6fa+e, stufe 2)
EP2019913A4 (de) * 2006-05-12 2011-06-01 Gen Electric Schaufel/scheiben-schwalbenschwanzhinterschnitt für schaufel/scheiben-spannungsreduzierung (6fa+e, stufe 2)
EP3144480A1 (de) * 2015-09-15 2017-03-22 General Electric Company Ausnehmung im laufschaufelfuss zur spannungsverminderung

Also Published As

Publication number Publication date
JPH08105301A (ja) 1996-04-23
US5567116A (en) 1996-10-22
EP0705958B1 (de) 1998-10-21
DE69505479T2 (de) 1999-04-15
FR2725239B1 (fr) 1996-11-22
FR2725239A1 (fr) 1996-04-05
DE69505479D1 (de) 1998-11-26

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