EP1818507A1 - Laufrad für Turbotriebwerke - Google Patents

Laufrad für Turbotriebwerke Download PDF

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Publication number
EP1818507A1
EP1818507A1 EP07290123A EP07290123A EP1818507A1 EP 1818507 A1 EP1818507 A1 EP 1818507A1 EP 07290123 A EP07290123 A EP 07290123A EP 07290123 A EP07290123 A EP 07290123A EP 1818507 A1 EP1818507 A1 EP 1818507A1
Authority
EP
European Patent Office
Prior art keywords
seal
groove
annular
blades
wheel 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.)
Granted
Application number
EP07290123A
Other languages
English (en)
French (fr)
Other versions
EP1818507B1 (de
Inventor
Claude Robert Louis Lejars
Nicolas Christian Triconnet
Frédérick Thise
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
SNECMA SAS
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 SNECMA SAS filed Critical SNECMA SAS
Publication of EP1818507A1 publication Critical patent/EP1818507A1/de
Application granted granted Critical
Publication of EP1818507B1 publication Critical patent/EP1818507B1/de
Active 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
    • F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
    • F01D25/04—Antivibration arrangements
    • F01D25/06—Antivibration arrangements for preventing blade vibration
    • 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
    • F01D11/005—Sealing means between non relatively rotating elements
    • F01D11/006—Sealing the gap between rotor blades or blades and rotor
    • 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
    • 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
    • F01D5/3023—Fixing blades to rotors; Blade roots ; Blade spacers of radial insertion type, e.g. in individual recesses
    • F01D5/303—Fixing blades to rotors; Blade roots ; Blade spacers of radial insertion type, e.g. in individual recesses in a circumferential slot
    • F01D5/3038—Fixing blades to rotors; Blade roots ; Blade spacers of radial insertion type, e.g. in individual recesses in a circumferential slot the slot having inwardly directed abutment faces on both sides
    • 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
    • F05D2230/60—Assembly methods
    • F05D2230/64—Assembly methods using positioning or alignment devices for aligning or centring, e.g. pins
    • 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
    • F05D2250/70—Shape

Definitions

  • the present invention relates to a rotor wheel, in particular a turbomachine, comprising a disc carrying blades whose feet are mounted in an annular groove of an outer peripheral surface of the disc.
  • the blade roots are introduced into this groove by a window of a side wall of the groove, and then circumferentially displaced in the groove to be retained radially and axially relative to the axis of the rotor by cooperation of shapes, the throat being of dovetail cross section or the like and the blade roots having a shape conjugate with that of the groove.
  • the blade roots are connected to the blades of the blades by platforms which, when the blades are mounted in the groove and juxtaposed circumferentially, surround the outer surface of the disk peripherally.
  • the blades In operation, the blades, subjected to large centrifugal forces, adopt a correct angular position with respect to the axis of the rotor, in which the radial clearances between the outer ends of the blades and an outer annular casing are minimized to improve the performance of the rotor. the turbomachine.
  • An annular elastomeric seal is generally mounted in an annular groove of the peripheral surface of the disk, upstream and / or downstream of the blades, under the platforms of the blades, and has in the free state a lower outer diameter or equal to that of its mounting groove to not interfere with the circumferential sliding of the blades in the annular groove of the disc.
  • this seal expands radially outwards under the effect of centrifugal forces and comes into contact with the platforms blades, to prevent an air passage between the platforms and the outer peripheral surface of the disk, which would reduce the performance of the turbomachine, and / or to dampen the vibrations of the blades.
  • the vanes of the wheel can tilt more or less with respect to their operating position and their ends can come rub on the outer casing, which results in a deterioration of the blades and a reduced performance of the turbomachine.
  • the invention aims in particular to provide a simple, economical and effective solution to this problem.
  • It relates to a rotor wheel whose blades are maintained, in operation and at the stop and start, substantially in the same position relative to the axis of the rotor.
  • a rotor wheel in particular a turbomachine, comprising a disc carrying blades whose feet are engaged and retained in an annular groove of an outer peripheral surface of the disk, these feet being connected to platforms externally surrounding the outer peripheral surface of the disk and intended to cooperate with an annular sealing gasket mounted in an annular groove of the outer peripheral surface of the disk, characterized in that, when stationary, the annular seal exerts on the plates. forms of the blades an elastic force maintaining the blades in a correct operating position, the annular seal having, in the free state, an outer diameter greater than that of its mounting groove, and its hardness being determined to ensure the return of the blades in their correct operating position and to allow the circumferential movement of the blades in their grooves annula mounting.
  • the annular seal damps the vibrations of the vanes and / or prevents the passage of air between the platforms of the vanes and the peripheral surface of the disc, and during the starting and stopping phases of the turbomachine, this same seal allows to position the vanes in a correct manner to prevent their ends from rubbing on the outer casing.
  • the platform of this blade comes into contact with the annular seal and deforms it locally.
  • the hardness of the elastic seal is determined so that the restoring force exerted by the seal on the blade is sufficiently small to allow the circumferential displacement of the blade in the groove and sufficiently large to ensure the correct positioning of the blade once. that it is mounted in the throat.
  • the seal preferably has a symmetrical shape with respect to its median transverse plane, which makes it easier to manufacture and to avoid incorrect assembly of the seal in the annular groove of the disc.
  • the seal comprises at least one outer peripheral lip intended to extend projecting outside the groove when the seal is mounted in the groove. This lip comes into contact with the platforms of the vanes mounted on the disc and ensures both the correct positioning of the blades, when stopping and starting the turbomachine, and the sealing between the platforms of the blades and the blade. peripheral surface of the disc and / or the damping of the vibrations of the blades, in operation of the turbomachine.
  • the seal may also include at least one inner peripheral lip for pressing against the bottom of the groove when the seal is mounted in the groove.
  • the annular seal has in cross section a substantially parallelogram or rhomboidal shape, an apex of which forms a radially inner or outer lip of the seal.
  • the annular seal has a cross-section substantially in the form of X or H.
  • the present invention also relates to an annular seal for a rotor wheel as described above, characterized in that it has, in the free state, an outer diameter greater than that of its annular groove. mounting and a Shore A hardness between 50 and 100 and for example equal to 75.
  • This seal is for example made in "VITON A” or "VITON B”.
  • This annular seal may be a seal and / or a vibration damping seal.
  • the invention also relates to a turbomachine compressor, comprising at least one rotor wheel as described above, and a turbomachine, such as an airplane turbojet or turboprop, characterized in that it comprises at least one rotor wheel as described above.
  • the low-pressure compressor 10 of FIG. 1 comprises three compression stages, each of these stages comprising an annular row of fixed vanes 12 of rectification, the radially outer ends of which are borne by an outer annular casing 14, and an annular row of moving blades 16, arranged downstream of the annular row of fixed blades 12, and whose feet 18 are mounted in an annular groove 20 of an outer peripheral surface of a disc 24 of a rotor wheel.
  • the disk 24 comprises a wall of revolution 22 which comprises external annular ribs 26 between which are delimited the annular grooves 20 for mounting the rows of blades 16, respectively.
  • the disc 24 is connected to a shaft of the turbomachine, not shown, by means of a drive cone 28 fixed on an upstream annular flange 30 of the revolution wall 22 of the disc.
  • Each groove 20 conventionally has a cross-section of the dovetail type or the like and comprises a non-visible window for introducing the feet 18 of the blades 16 which have a shape complementary to that of the groove 20.
  • the groove 20 of the disc 24 comprises an annular bottom 31 extending between two side walls 32 each having an axial annular flange 34 oriented substantially towards the opposite side wall 32.
  • the introduction window of the feet 18 of the blades is for example formed in a side wall 32 of the groove or by cutting the annular rims 34 of the groove.
  • the feet 18 of the vanes comprise upstream and downstream flanges 42, circumferentially oriented around the axis of the rotor, intended to be housed between the bottom 31 of the groove and the annular rims 34 of the groove, respectively, and to cooperate by abutment with these so as to retain radially and axially the vanes 16 on the disk relative to the axis of the rotor.
  • the blades 16 (for example 62 in number) are introduced into the annular groove 20 of the disk one after the other and are juxtaposed circumferentially around the axis of the rotor.
  • the feet 18 of the blades are connected to the blade blades by platforms 44 which are circumferentially aligned with each other and surround the annular ribs 26 externally.
  • the radial clearance between the radially outer end of a downstream rib 26 and the corresponding part of the blade root or the platform 44 can reach 0.15 mm in the case of a ring groove Having an outer diameter of about 1.20 m.
  • the blades 16 are subjected to significant centrifugal forces and adopt a rectified angular position with respect to the axis of the rotor in which the downstream edges 42 of the blade roots abut on the rim 34 of the downstream wall.
  • 32 of the groove ( Figure 2), and the platforms 44 of the blades are supported on the outer periphery of the upstream wall 32 of the groove and are spaced from the outer periphery of the downstream wall 32 of the groove, the games Radials between the outer ends of the blades 16 and the outer casing 14 are then minimized to improve the performance of the turbomachine.
  • the inner surface of the platform 44 of each blade comprises an annular rib 46 projecting towards the axis of the rotor which is hooked on the outer periphery of the upstream wall 32 of the groove, as shown in FIG.
  • a one-piece annular seal 50 of elastomer and circular section is mounted in an annular groove 52 of the outer periphery of the downstream side wall 32 of the groove, this groove 52 opening radially outwardly under the downstream ends 48 of the platforms blades.
  • the seal 50 has in the free state an outer diameter less than or equal to that of the groove 52 (as shown in dashed lines in Figure 2) and is, at rest, housed entirely in the groove.
  • This seal 50 may be a seal and / or a vibration damping seal.
  • the seal 50 expands radially outwards under the effect of centrifugal forces and is supported on internal downstream surfaces 48 of the blade platforms (as shown in solid lines), to prevent an air passage between the platforms of the blades and the outer periphery of the downstream wall 32 of the groove, and / or to exert pressure on the platforms and dampen the vibrations of the blades.
  • the vanes 16 of the wheel swing slightly downstream and adopt another angular position with respect to the axis of the rotor, in which the downstream edges 42 of the blade roots come into contact with each other. support on the bottom 31 of the groove so that the radially outer ends of the blades 16 are likely to touch the outer casing 14, which may deteriorate the blades at startup and shutdown and thus reduce the performance of the turbomachine .
  • the invention responds to this problem by means of an annular seal mounted in the groove 52 and which makes it possible, on stopping the turbomachine, to exert on the platforms 44 of the vanes an elastic force urging the blades 16 towards their position. operating in which the ends of the blades are spaced apart from the outer casing 14 and can not rub on it.
  • the seal 54 has a substantially diamond-shaped section and comprises an outer peripheral lip 56 with a triangular section intended to protrude outside the groove 52 in order to come into contact. bearing against the internal downstream surfaces 48 of the platforms of the blades, and an inner peripheral lip 58 with a triangular section intended to bear against the bottom of the groove 52, when the seal 54 is mounted in the groove.
  • the upstream and downstream edges 60 of the gasket 54 are intended to bear against the lateral walls of the groove 52.
  • the dimensions and the hardness of the seal 54 have been determined so that on the one hand the vanes 16 of the wheel adopt substantially the same angular position when the turbine engine is stopped and in operation, and on the other hand, so that the seal 54 does not prevent the introduction of the blade roots 18 into the groove 20 of the disk and the circumferential displacement of the blades in this groove by friction of the surfaces 48 of the platforms on the seal 54.
  • the seal 54 is elastically deformed between the platforms of the blades and the bottom of the groove 52 and exerts on these platforms a restoring force to ensure the correct positioning of the blades.
  • the annular seal 54 has an outer diameter of approximately 1.20 meters, a Shore A hardness of between 50 and 100, for example approximately 75, and can withstand temperatures which can reach 150 ° C.
  • This seal is for example made in "VITON A” or "VITON B”.
  • the seal 62 has a section substantially in X or H and comprises two outer peripheral lips 64 which protrude outside the groove 52 to bear on the internal surfaces downstream 48 platforms of the blades, and two inner peripheral lips 66 whose upstream and downstream side surfaces 68 are substantially flat and parallel and bear against the side walls of the groove 52, when the seal 62 is mounted in the groove 52.
  • the seal 62 is elastically deformed between the platforms of the blades and the bottom of the groove 52 and exerts on the platforms a restoring force to ensure the correct positioning of the blades.
  • the invention is not limited to the embodiments which have been described in the foregoing and represented in FIGS. 3 to 5.
  • the seal 54 or 62 which preferably has a shape that is symmetrical with respect to its median transverse plane, may have a shape in section different from those shown.
  • the seal 54 or 62 could be mounted in an annular groove of the upstream side wall 32 of the groove, this groove opening under the upstream parts of the platforms 44 of the blades.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
EP07290123.4A 2006-02-08 2007-01-30 Laufrad eines Turbotriebwerks Active EP1818507B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0601098A FR2897099B1 (fr) 2006-02-08 2006-02-08 Roue de rotor de turbomachine

Publications (2)

Publication Number Publication Date
EP1818507A1 true EP1818507A1 (de) 2007-08-15
EP1818507B1 EP1818507B1 (de) 2016-06-29

Family

ID=37075575

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07290123.4A Active EP1818507B1 (de) 2006-02-08 2007-01-30 Laufrad eines Turbotriebwerks

Country Status (5)

Country Link
US (1) US8038403B2 (de)
EP (1) EP1818507B1 (de)
JP (1) JP4847887B2 (de)
CA (1) CA2577502C (de)
FR (1) FR2897099B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2940350A1 (fr) * 2008-12-23 2010-06-25 Snecma Roue mobile de turbomachine a aubes en materiau composite munie d'un anneau ressort.
DE102009030397A1 (de) * 2009-06-25 2010-12-30 Mtu Aero Engines Gmbh Befestigungsvorrichtung einer Turbinen- oder Verdichterschaufel

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2157283A1 (de) * 2008-08-18 2010-02-24 Siemens Aktiengesellschaft Schaufelbefestigung mit Dämpfungselement für eine Strömungsmaschine
US9140136B2 (en) * 2012-05-31 2015-09-22 United Technologies Corporation Stress-relieved wire seal assembly for gas turbine engines

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2013754A1 (de) * 1968-07-26 1970-04-10 Sulzer Ag
FR2504975A1 (fr) * 1981-04-29 1982-11-05 Rolls Royce Dispositif de fixation des aubes de rotors de turbomachines
EP0280246A1 (de) * 1987-02-24 1988-08-31 Westinghouse Electric Corporation Verfahren zum Schaufelbefestigen von Dampfturbinenschaufeln
US6375429B1 (en) * 2001-02-05 2002-04-23 General Electric Company Turbomachine blade-to-rotor sealing arrangement
US20040086387A1 (en) * 2002-10-31 2004-05-06 Fitts David Orus Continual radial loading device for steam turbine reaction type buckets and related method

Family Cites Families (10)

* Cited by examiner, † Cited by third party
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JPS5857505A (ja) * 1981-10-02 1983-04-05 Hitachi Constr Mach Co Ltd 電気油圧変換弁の制御装置
JPS61132799A (ja) * 1984-11-29 1986-06-20 Toshiba Corp 軸流圧縮機の羽根車
US4878811A (en) * 1988-11-14 1989-11-07 United Technologies Corporation Axial compressor blade assembly
GB2234299B (en) * 1989-07-06 1994-01-05 Rolls Royce Plc Mounting system for engine components having dissimilar coefficients of thermal expansion
US5211536A (en) * 1991-05-13 1993-05-18 General Electric Company Boltless turbine nozzle/stationary seal mounting
FR2700807B1 (fr) * 1993-01-27 1995-03-03 Snecma Système de rétention et d'étanchéité d'aubes engagées dans des brochages axiaux d'un disque de rotor.
US6095750A (en) * 1998-12-21 2000-08-01 General Electric Company Turbine nozzle assembly
US6565322B1 (en) * 1999-05-14 2003-05-20 Siemens Aktiengesellschaft Turbo-machine comprising a sealing system for a rotor
FR2856105B1 (fr) * 2003-06-16 2007-05-25 Snecma Moteurs Amelioration de la capacite de retention d'une aube a attache marteau dissymetrique a l'aide des raidisseurs de plates-formes
US7334331B2 (en) * 2003-12-18 2008-02-26 General Electric Company Methods and apparatus for machining components

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2013754A1 (de) * 1968-07-26 1970-04-10 Sulzer Ag
FR2504975A1 (fr) * 1981-04-29 1982-11-05 Rolls Royce Dispositif de fixation des aubes de rotors de turbomachines
EP0280246A1 (de) * 1987-02-24 1988-08-31 Westinghouse Electric Corporation Verfahren zum Schaufelbefestigen von Dampfturbinenschaufeln
US6375429B1 (en) * 2001-02-05 2002-04-23 General Electric Company Turbomachine blade-to-rotor sealing arrangement
US20040086387A1 (en) * 2002-10-31 2004-05-06 Fitts David Orus Continual radial loading device for steam turbine reaction type buckets and related method

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2940350A1 (fr) * 2008-12-23 2010-06-25 Snecma Roue mobile de turbomachine a aubes en materiau composite munie d'un anneau ressort.
WO2010072968A1 (fr) * 2008-12-23 2010-07-01 Snecma Roue mobile de turbomachine a aubes en materiau composite munie d'un anneau ressort
US8905710B2 (en) 2008-12-23 2014-12-09 Snecma Turbine engine rotor wheel with blades made of a composite material provided with a spring ring
DE102009030397A1 (de) * 2009-06-25 2010-12-30 Mtu Aero Engines Gmbh Befestigungsvorrichtung einer Turbinen- oder Verdichterschaufel

Also Published As

Publication number Publication date
FR2897099A1 (fr) 2007-08-10
FR2897099B1 (fr) 2012-08-17
CA2577502C (fr) 2014-08-19
JP4847887B2 (ja) 2011-12-28
US20070183894A1 (en) 2007-08-09
CA2577502A1 (fr) 2007-08-08
US8038403B2 (en) 2011-10-18
EP1818507B1 (de) 2016-06-29
JP2007211777A (ja) 2007-08-23

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