EP0068923B1 - Dispositif de verrouillage d'une aube de rotor de turbomachine - Google Patents

Dispositif de verrouillage d'une aube de rotor de turbomachine Download PDF

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Publication number
EP0068923B1
EP0068923B1 EP82400967A EP82400967A EP0068923B1 EP 0068923 B1 EP0068923 B1 EP 0068923B1 EP 82400967 A EP82400967 A EP 82400967A EP 82400967 A EP82400967 A EP 82400967A EP 0068923 B1 EP0068923 B1 EP 0068923B1
Authority
EP
European Patent Office
Prior art keywords
blade
locking
groove
axial
blade root
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.)
Expired
Application number
EP82400967A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0068923A1 (fr
Inventor
Alexandre Forestier
Raymond Jean Maurice Joubert
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.)
Safran Aircraft Engines SAS
Original Assignee
Societe Nationale dEtude et de Construction de Moteurs dAviation SNECMA
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 Societe Nationale dEtude et de Construction de Moteurs dAviation SNECMA filed Critical Societe Nationale dEtude et de Construction de Moteurs dAviation SNECMA
Publication of EP0068923A1 publication Critical patent/EP0068923A1/fr
Application granted granted Critical
Publication of EP0068923B1 publication Critical patent/EP0068923B1/fr
Expired 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
    • F01D5/32—Locking, e.g. by final locking blades or keys
    • F01D5/326—Locking of axial insertion type blades by other means
    • 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
    • F01D5/32—Locking, e.g. by final locking blades or keys
    • F01D5/323—Locking of axial insertion type blades by means of a key or the like parallel to the axis of the rotor

Definitions

  • the invention relates to a device for locking a blade on a turbomachine rotor disk, the rim of the rotor disk having teeth formed by substantially axial grooves, said grooves receiving the blade roots which are locked radially by wedges placed between the blade root and the bottom of the groove, means being provided for axially locking said wedges, the blade root being extended by a stilt carrying a platform and a blade, said device comprising locking means cooperating with corresponding housings provided on the disc.
  • Known axial blade locking devices comprising a stop member cooperating with housings provided in the blade root and in the axial groove in which the blade is slid and held radially. This stop member is held in place by a wedge which is introduced between the bottom of the groove and the lower part of the blade root.
  • French Patent No. 2,345,605 describes a device of this kind.
  • the rim of the rotor disc has axial dovetail grooves which extend partially in a peripheral part of the rim projecting from the face of the disc.
  • the blade roots have a bead corresponding to the projecting part of the rim and which carries a transverse slot in its lower part.
  • Opposite radial slots are provided in the edges of the axial grooves.
  • the stop member is in the form of a U-shaped part, the lateral branches of which cooperate by their external faces with the radial slots of the groove and the transverse branch with the transverse slot of the blade root.
  • the U-shaped part is inserted radially from the inside to the outside into the slots and is held by the end of the shim introduced between the blade root and the bottom of the groove.
  • the shim is held axially in the usual way by flanges of the cover and / or of the preceding or following rotor drum.
  • the device is reliable and of easy assembly and disassembly, but it has the disadvantage of requiring a blade provided with a bead and a projecting rim, which has the consequence of increasing the total mass of the rotor.
  • French patent n ° 2273155 shows a device requiring neither a vane heel nor a projecting rim.
  • the blade the ends of the feet of which are parallel, does not have a bead and the rim carrying the axial grooves has no projecting peripheral part.
  • the axial grooves are dovetail-shaped and are divided transversely by a peripheral groove parallel to the faces of the disc.
  • the lower part of the blade root carries two notches, an axial and a transverse, the axial notch corresponding to the same notch provided in the bottom of the axial groove and the transverse notch corresponding to the peripheral groove.
  • the stop member is formed of a sliding part having a contour corresponding to the vertical section of the groove, the axial locking being obtained by a relative movement between this part and a transverse notch.
  • the positioning rod is integrated into the foot of the blade and the arrangement of the passages for the rod and the sliding part weakens the foot accordingly; moreover, this rod does not perform any radial locking function of the blade.
  • the stop member is formed of an elongated elastic piece of width equal to that of the groove and having in its middle a transverse part forming a cross.
  • the organ is placed in the groove so that the transverse part is aligned with the notch in the bottom of the groove.
  • the stop member is housed partly in the axial and transverse notches of the blade root and maintains it in the axial direction.
  • This device makes it possible to reduce the total mass of the rotor, but has the drawback of requiring special tools for the installation or removal of the blades.
  • the invention aims to produce an axial blade locking device which, while keeping the total mass of the rotor as low as possible, allows easy intervention on the blades.
  • the locking device according to the invention is remarkable in that the locking means consist of stops having surfaces arranged in radial planes provided on opposite sides of the stilt and have a shape allowing, by introduction and displacement of the blade in the groove, their matching with radial bearing surfaces provided on the teeth of the rim and their cooperation with said bearing surfaces after a radial displacement of the stops and the blade by a shim placed between the bottom of the groove and the foot of the blade so as to axially lock the latter.
  • Figure 1 shows an exploded view of part of a rotor disc and a blade in which is provided a locking device according to the invention.
  • the rim 1 of the rotor disc 2 has teeth 3 formed by the axial grooves 4, which receive the feet 5 of the blades 6.
  • the blades are locked radially by wedges 7 placed between the underside of the blade root and the bottom of the blade. the groove.
  • the axial locking of the blade is obtained according to the invention by a device comprising stops 11 ( Figure 3), provided at least on part of the faces of the stilt 8, and housings 12 provided on the teeth 3 of the rim and shaped so as to cooperate with the stops 11 when the shim is placed between the blade root and the bottom of the groove.
  • the stops 11 are formed by a part of a locking piece 13 housed in a notch 14 of the blade root and the stilt, this notch being in the median radial plane of dawn, or in the vicinity of this plane.
  • the locking piece has an upper part 15 of approximately parallelepiped shape corresponding to the notch of the stilt and a lower part 16 of shape and dimensions similar to those of a cross section of the axial groove.
  • the thickness of these parts 15, 16 is equal to the width of the notch in the blade root and the stilt.
  • a wedge 7 is slid between the underside of the blade root and the bottom of the groove which pushes the part locking in the notch 14 and in the housings 12.
  • These housings 12 are constituted by two notches machined one opposite the other on the neighboring edges of two teeth 3. Their positions and dimensions are defined as a function of the position notch in the blade root and are, for example, in the median radial plane of the rotor disc.
  • the wedge 7 locks the blade root and the locking part in the radial direction, which in turn locks the blade in the axial direction.
  • the wedge 7 is held axially for example by flanges 19 and 20 fixed to the rim by bolts 21, or any other known means (for example that shown in FIG. 8 for the third embodiment).
  • the locking piece is held by known means (gluing, welding point for example) in the notch of the blade root and the stilt so that the part 18 is flush with the bottom of the foot.
  • the blade root then appears as shown in Figure 3.
  • the stops are integral with the blade roots and a portion of the end faces of the stilt and consist of one or two inserts 54, 55, of shape and dimensions similar to those of a cross section of the axial grooves of the disc 4.
  • These parts 54, 55 are fixed by welding or brazing-diffusion, or any other known means, on the upstream or downstream face (or on the two) blade roots extended by the stilt.
  • the installation is done in a manner very similar to that which has been described above; the foot of the blade is introduced into the axial groove, then the wedge 7 is slid under the foot, which has the effect of “raising the blade radially so that the oblique sides of the foot come into contact with the sides 50, 51 of the groove.
  • the upper parts of the inserts 54, 55 then “frame the upstream and downstream sides of the teeth of the disc. These upper parts form stops which cooperate with the parts 56 of the front faces of the rim teeth and lock the blade axially.
  • the wedge 7 is locked as indicated above.
  • the advantage of this arrangement is to avoid bleeding from the locking system which weakens the blade and the disc.
  • FIGS 7 to 9 show another embodiment of the device according to the invention.
  • the stops are in the form of tenons 22, 23 secured to the faces of the stilt 8 and placed at a certain distance from the foot 24.
  • the housings intended to cooperate with the stops consist of stop pieces 26, 27, 28, 29 placed in pairs on either side of the edges of the groove 30.
  • Two stop pieces 26, 28 and 27, 29, placed on the same groove edge, are spaced by a distance equal to the width of the studs 22, 23.
  • the two opposite abutment pieces 26, 27 facing two teeth of the disc in any case arranged the closer to the entrance of the groove by which the blade root is introduced, bear on the opposite sides of the lateral axial grooves 31, 32.
  • the depth of the grooves allows the free passage of the studs 22, 23 carried by the stilt.
  • the height of the stop pieces is such that, when the blade root is placed in the groove 30 and locked radially by the wedge 33, the pins 22, 23 are placed between the stop pieces 26, 28 and 27, 29 in the spaces 52, 53 forming housings, the vertices 34, 35, 36, 37 of the abutment pieces being approximately in the plane of the upper faces 38, 39 of the studs.
  • the blade root can be introduced either through one or the other of the ends of the groove 30 and, in this case, all the abutment parts carry lateral axial grooves 31, 32, 40, 41.
  • the blade root 24 is introduced into the groove 30, the blade being directed as shown in FIG. 6, the lower part of the foot sliding against the bottom of the groove.
  • the pins 22, 23 pass over the edges of the teeth and between the grooves 31, 32 of the abutment pieces 26, 27.
  • the pins are located between the abutment pieces 26, 28 and 27, 29.
  • the shim 33 is introduced between the foot and the bottom of the groove so that the upper part of the foot comes to rest against the sides 50, 51 of the groove 30 in dovetail.
  • the blade moves radially and the studs are placed between the stop pieces, so that the upper faces of the studs are approximately in the same plane as the upper faces 34, 35, 36, 37 of the stop pieces.
  • the shim 33 is locked axially, for example by flanges such as 19 and 20, shown in Figure 1 or by any other known means (for example, as shown in Figure 8) by pressing backwards on a flange secured to the disc drive drum and by pressing upstream on a flange of the inlet cowling, cowling itself fixed by any known means.
  • surfaces 42, 43 surround each of the studs 22, 23. These surfaces come to fit between the abutment pieces and more particularly against the axial lateral faces 44, 45, 46, 47 in order to avoid rattling at low speed.
  • Abutment parts may extend over the entire width of the teeth and be symmetrical 'relative to the axial center plane thereof.
  • the abutment pieces of the same tooth for example 26, 28 or 27, 29 are used to hold the tenons of two neighboring blades.
  • the stop pieces are generally formed by. rim machining. Due to the position of the pins on the stilt and the inclination of the blade platform, the stop pieces can be provided towards the rear of the rim in order to facilitate the mounting of the blade.
  • the various embodiments of the locking device according to the invention ensure independent locking of each blade, which allows easy maintenance of the rotor by removing only the blades concerned. According to the adopted embodiment, after removing the cover 57, it suffices to remove the shim 7 or 33 so that the assembly (locking piece + foot) descends into the axial groove 4 or 30 and can be removed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
  • Supercharger (AREA)
EP82400967A 1981-06-12 1982-05-26 Dispositif de verrouillage d'une aube de rotor de turbomachine Expired EP0068923B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8111565 1981-06-12
FR8111565A FR2507679A1 (fr) 1981-06-12 1981-06-12 Dispositif de verrouillage d'une aube de rotor de turbomachine

Publications (2)

Publication Number Publication Date
EP0068923A1 EP0068923A1 (fr) 1983-01-05
EP0068923B1 true EP0068923B1 (fr) 1985-08-07

Family

ID=9259430

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82400967A Expired EP0068923B1 (fr) 1981-06-12 1982-05-26 Dispositif de verrouillage d'une aube de rotor de turbomachine

Country Status (5)

Country Link
US (1) US4527952A (enrdf_load_stackoverflow)
EP (1) EP0068923B1 (enrdf_load_stackoverflow)
JP (1) JPS585430A (enrdf_load_stackoverflow)
DE (1) DE3265220D1 (enrdf_load_stackoverflow)
FR (1) FR2507679A1 (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3144848A1 (fr) * 2023-01-05 2024-07-12 Safran Aircraft Engines Ensemble rotorique de soufflante pour turbomachine

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FR2566061B1 (fr) * 1984-06-14 1988-09-02 Snecma Dispositif de verrouillage axial d'une aube de turbomachine
FR2585069B1 (fr) * 1985-07-16 1989-06-09 Snecma Dispositif de limitation du debattement angulaire d'aubes montees sur un disque de rotor de turbomachine
DE3743253A1 (de) * 1987-12-19 1989-06-29 Mtu Muenchen Gmbh Axial durchstroemtes laufschaufelgitter fuer verdichter oder turbinen
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DE4430636C2 (de) * 1994-08-29 1997-01-23 Mtu Muenchen Gmbh Einrichtung zur Laufschaufelfixierung und zur Beseitigung von Rotorunwuchten bei axial durchströmten Verdichtern oder Turbinen von Gasturbinentriebwerken
GB2299834B (en) * 1995-04-12 1999-09-08 Rolls Royce Plc Gas turbine engine rotary disc
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GB9615826D0 (en) * 1996-07-27 1996-09-11 Rolls Royce Plc Gas turbine engine fan blade retention
RU2153078C2 (ru) * 1998-08-14 2000-07-20 Акционерное общество открытого типа "Ленинградский Металлический завод" Узел соединения лопаток с ротором турбомашины
DE102004017193A1 (de) * 2004-04-07 2005-10-27 Rolls-Royce Deutschland Ltd & Co Kg Turbinenschaufelarretiervorrichtung
JP4807113B2 (ja) * 2006-03-14 2011-11-02 株式会社Ｉｈｉ ファンのダブテール構造
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US8764402B2 (en) * 2011-06-09 2014-07-01 General Electric Company Turbomachine blade locking system
US9051845B2 (en) 2012-01-05 2015-06-09 General Electric Company System for axial retention of rotating segments of a turbine
US9246372B2 (en) 2012-01-20 2016-01-26 Fluor Technologies Corporation Rotor pole support ribs in gearless drives
FR3004484B1 (fr) * 2013-04-11 2017-09-08 Snecma Aube de turbomachine cooperant avec un disque de retention d'aubes
KR101513062B1 (ko) * 2013-10-16 2015-04-17 두산중공업 주식회사 증기터빈
GB201419965D0 (en) * 2014-10-06 2014-12-24 Rolls Royce Plc Fan
GB201618454D0 (en) * 2016-09-23 2016-12-14 Rolls-Royce Ltd Gas turbine engine
GB201704832D0 (en) * 2017-02-20 2017-05-10 Rolls Royce Plc Fan
KR102176954B1 (ko) * 2017-09-14 2020-11-10 두산중공업 주식회사 가스 터빈용 압축기 로터 디스크
FR3127021B1 (fr) * 2021-09-14 2025-05-09 Safran Aircraft Engines Aube mobile pour turbine de turbomachine, comprenant une échasse équipée d’excroissances de retenue radiale de l’aube
FR3144849B1 (fr) * 2023-01-05 2025-07-04 Safran Aircraft Engines Ensemble rotorique de soufflante pour turbomachine
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3144848A1 (fr) * 2023-01-05 2024-07-12 Safran Aircraft Engines Ensemble rotorique de soufflante pour turbomachine

Also Published As

Publication number Publication date
DE3265220D1 (en) 1985-09-12
FR2507679A1 (fr) 1982-12-17
US4527952A (en) 1985-07-09
JPS585430A (ja) 1983-01-12
EP0068923A1 (fr) 1983-01-05
FR2507679B1 (enrdf_load_stackoverflow) 1984-03-23
JPS6215725B2 (enrdf_load_stackoverflow) 1987-04-09

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