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EP1584794B1 - Turbomaschinenrotorscheibe mit einer Axialhalterung für die Laufschaufeln - Google Patents

Turbomaschinenrotorscheibe mit einer Axialhalterung für die Laufschaufeln Download PDF

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Publication number
EP1584794B1
EP1584794B1 EP05290544.5A EP05290544A EP1584794B1 EP 1584794 B1 EP1584794 B1 EP 1584794B1 EP 05290544 A EP05290544 A EP 05290544A EP 1584794 B1 EP1584794 B1 EP 1584794B1
Authority
EP
European Patent Office
Prior art keywords
edge
annulus
lock
annular
disk
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 - Lifetime
Application number
EP05290544.5A
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English (en)
French (fr)
Other versions
EP1584794A1 (de
Inventor
Didier Désiré René Pasquiet
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 EP1584794A1 publication Critical patent/EP1584794A1/de
Application granted granted Critical
Publication of EP1584794B1 publication Critical patent/EP1584794B1/de
Anticipated expiration legal-status Critical
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
    • F01D5/3015—Fixing blades to rotors; Blade roots ; Blade spacers of axial insertion type with side plates

Definitions

  • the present invention relates to a device for axially retaining blades on a rotor disc, in particular in a high-pressure compressor or a high-pressure turbine of a turbomachine such as a turbojet engine.
  • the radially outer edge of the annular groove of the disk and the radially inner edge of the flange are generally scalloped or crenelated in a corresponding manner, which makes it possible to bring the flange inside the annular groove of the disk by axial translation when the solid portions of the scalloped edge of the flange are aligned with the hollow portions of the scalloped edge of the annular groove, then axially locking the flange in the annular groove by rotating it so that the solid portions of its scalloped edge are aligned with the solid portions; the scalloped edge of the annular groove of the disk and are axially supported on them.
  • the radially outer portion of the flange comprises, on its face facing the blade roots, studs which are intended to engage in corresponding cavities of the blade roots and which ensure a locking of the flange in rotation about its axis .
  • the flange In the locking position, the flange is axially constrained by its parts resting on the blade roots, on the downstream face of the disc and on the scalloped edge of the annular groove of the disc. To bring it into this position by rotation in the annular groove, it must be deformed by pulling axially on its radially outer part and pushing axially on its radially inner portion, respectively to separate the aforementioned nipples from the ends of the blade roots until the nipples are in front of the cavities intended to receive them, and to pass the solid portions of the scalloped edge of the flange to inside the annular groove of the disc.
  • nipples must be machined and cut into the mass of the flanges, which is long and extremely expensive. It is also necessary to machine cavities receiving these nipples at the ends of the blade roots, which further increases the cost.
  • the present invention is intended to avoid these disadvantages of the known technique.
  • It relates to a device for axially retaining the blade roots on a rotor disc of the aforementioned type, which does not require special machining of the flanges and which allows easier assembly and disassembly of the flanges on the rotor discs, while reducing the risk of damage to the flanges during assembly.
  • a rotor disc of a turbomachine comprising blades whose feet are mounted in grooves of the periphery of the disc, and an annular flange comprising a radially outer flange which rests on the feet of the blades for their axial retention and a scalloped or crenally radially inner flange which is mounted in an annular groove of the disc and cooperates with a scalloped or crenally radially outer flange of the groove for immobilizing the flange in axial translation on the disc, characterized in that a annular lock is received in the annular groove of the disk to immobilize the flange in rotation in this annular groove, said latch comprising a radially internal festooned or crenated portion and being movable in rotation in the annular groove between a locking position of the flange in which the solid portions of the radially inner portion of the latch is aligned with the hollow portions of the outer flange of the groove, and a mounting and
  • annular lock according to the invention, it is no longer necessary to machine nipples on the flange and receiving cavities of these nipples in the blade roots.
  • the locking of the flange in the blade root holding position can be done without deformation of the flange and thus reducing the risk of deterioration of the flange.
  • the latch comprises hooks intended to engage by resilient snapping on the radially inner edge of the flange and between solid portions of the scalloped or crenellated edge of the annular groove in the locking position of the flange .
  • the hooks of the annular lock are formed on the solid portions of its radially inner scalloped portion.
  • the hooks of the lock comprise radial tabs extending towards the axis of the lock from a radially outer annular portion thereof and axial tabs connected to the radial tabs at one of their ends and ending at their other end by a spout oriented radially outwardly and forming a retaining member of the radially inner edge of the flange.
  • the locking of the latch on the flange is made possible by an elastic deformation of the axial tabs and the radial tabs of the hooks.
  • the solid portions of the scalloped or flanged edge of the flange are automatically aligned with the solid portions of the scalloped edge of the annular groove, because of the engagement of the bolt hooks in the hollow portions of the annular rim scalloped from the throat of the disc.
  • the aforementioned axial tabs of the hooks are extended, at their end with the beaks, by second radial tabs extending in the opposite direction to the beaks.
  • These radial tabs engage accurately in the hollow portions of the edge of the annular groove of the disc and advantageously comprise means such as engagement or engagement holes by tools allowing, by traction, to snap the beaks on the edge of the flange and, by pushing, to release the spouts from the edge of the flange, for disassembly of the flange.
  • the radially outer portion of the annular lock is axially applied to the radially inner edge of the flange which is axially applied to the solid portions of the scalloped edge of the annular groove and which is clamped axially between the radially outer portion annular latch and the spouts of the hooks formed at the radially inner portion of said latch.
  • the rotor of a compressor or a high-pressure turbine of a turbomachine comprises a plurality of rotor discs, one of which is partially shown in FIG. figure 1 each disc 10 carrying a plurality of substantially radial blades 12 whose feet 14 are engaged in axial grooves, for example dovetail grooves, of the periphery of the disc 10.
  • the blades 12 mounted on the disk 10 are immobilized axially in these grooves by an upstream annular flange 16 and a downstream annular flange 18 mounted on the disk.
  • the upstream annular flange 16 comprises on its radially inner portion, an inner annular flange 20 oriented radially inwards and housed in an annular groove 22 of the upstream face of the disc 10 and a cylindrical flange 24 oriented downstream and inserted into a cylindrical groove 26 of the upstream face of the disc 10.
  • the radially outer portion 28 of the upstream flange 16 is supported on the upstream end of the feet 14 of the blades 12 of the disc 10, thus ensuring their axial retention towards the upstream .
  • the downstream annular flange 18 comprises a radially inner portion 30, whose edge is "scalloped” or crenellated, that is to say having solid portions alternately formed with hollow portions regularly distributed over the circumference of the flange 18, and housed in an annular groove 32 of the downstream face of the disc 10.
  • the radially outer portion 34 of the downstream flange 18 is supported on the downstream end of the feet 14 of the vanes 12, thus ensuring their axial retention towards the downstream.
  • the downstream flange 18 is immobilized in rotation around the axis of the disk 10 by means of several pins 36 provided on the upstream face of its radially outer portion 34 and intended to engage in corresponding cavities of the feet 14 of the blades 12.
  • the radially inner annular edge 38 of the groove 32 is "scalloped” or crenellated like the inner annular edge 30 of the flange 18, which makes it possible to engage the inner edge 30 of the flange 18 in the groove 32 by axial translation and of the then immobilize axially by rotation in the groove 32 until the solid parts of the inner edge "scalloped” or crenellated 30 of the flange 18 are aligned with the solid portions of the edge 38 of the groove 32 and resting on these solid parts.
  • the annular flange 18 is axially constrained, its radially outer portion 34 being applied under pressure to the ends of the feet 14 of the blades 12 and its radially inner portion 30 being applied under pressure to the edge 38 of the groove 32.
  • the device according to the invention avoids these disadvantages and also the need to machine nipples 36 on the outer portion of the flange 18 and cavities corresponding receiving in the feet 14 of the blades 12.
  • This device comprises an annular flange 40 associated with an annular lock 42 which is mounted in the groove 32 of the disc 10 and is made of any suitable material, in particular metal.
  • the annular flange 40 corresponds essentially to the flange 18 of the figure 1 with the exception of the pins 36, and comprises an inner annular flange 44 housed in the annular groove 32 of the disc 10 and a cylindrical surface 46 formed on its upstream face and intended to engage with a weak game inside the edge radially outer peripheral of the annular groove 32 to center the flange 40 on the disk 10.
  • the downstream flange 40 further comprises on its radially outer portion, a cylindrical peripheral rim 48 facing upstream and which rests on the downstream end of the feet 14 of the blades 12, thus ensuring their axial retention in the direction of the downstream.
  • annular lock 42 is better visible at Figures 3 and 4 where it is shown engaged by axial translation in the annular groove 32, the radially inner edge 50 "scalloped” or crenellated comprises solid portions 52 formed alternately with hollow portions 54 regularly distributed over the circumference of the groove 32.
  • the latch 42 essentially comprises a flat radial ring 56 on which depend hooks 58 intended to cooperate with the internal "scalloped” or crenellated edges of the flange 40 and the groove 32.
  • the number of hooks 58 may be equal to the number of hollow portions 54 of the edge 50 or less than this number, the hooks 58 then being distributed over the circumference of the lock 42.
  • the hooks 58 extend downstream with respect to the flat ring 56 and comprise first radial tabs 60 extending from the ring 56 towards the axis of the lock 42, axial tabs 62 connected to the radially inner ends radial tabs 60 and oriented downstream of the disc 10, and second radial tabs 64 connected to the downstream ends of the axial tabs 62 and oriented towards the axis of the latch 42.
  • the axial tabs 62 of the hooks 58 comprise at their downstream end, a spout 66 intended to engage the inner edge 44 of the flange 40, the spouts 66 having a radial upstream face 68 and a downstream face 70 oblique or beveled.
  • the second radial tabs 64 of the hooks 58 comprise orifices 72 for gripping or engaging these tabs 64 by means of tools, as will be described in more detail in the following.
  • the radial dimension of the ring 56 is relatively small compared to that of the groove 32 of the disc 10, and the second radial tabs 64 of the hooks 58 have a shape and dimensions substantially conjugate with those of the hollow portions 54 of the edge 50 of the groove 32, so that the latch 42 can be engaged in the groove 32 by axial translation, without deformation, when its second radial tabs 64 are aligned with the hollow portions 54 of the edge 50 of the groove 32, as shown in FIG. figure 3 .
  • the latch 42 is then rotated about the axis of the disk 10 in the annular groove 32, from the position shown in FIG. figure 3 to a mounting position of the flange 40 shown in FIG. figure 5 .
  • the radially inner edge 44 of the downstream annular flange 40 is "scalloped” or crenellated and has solid portions 74 formed alternately with hollow portions 76 regularly distributed over the circumference of the flange 40.
  • the "scalloped" edge 44 of the flange 40 is complementary to the edge 50 "scalloped" of the groove 32, so that when the latch 42 is in the mounting position of the flange 40 shown in FIG. figure 5 , the flask 40 can be inserted into the groove 32 by axial translation, the solid portions 74 of its edge 44 being aligned with the hollow portions 54 of the edge 50 of the groove 32.
  • the hollow portions 76 of the crenellated edge 44 of the flange 40 have an outside diameter smaller than the external diameter of the slats 66, so that when the edge 44 of the flange 40 is engaged in the groove 32, the hooks 58 are deformed elastically by bearing spouts 66 on the bottoms of the hollow portions 76 of the edge 44 of the flange 40.
  • the first radial flaps 60 and the axial flaps 62 of the hooks 58 are deformed and the angular spacing between them is modified and passes for example from a 90 ° angle at an angle of about 120 °, the second radial tabs 64 being pushed towards the axis of the disc 10 without being deformed.
  • the downstream face 70 oblique or beveled spouts 66 promotes the engagement of the flange 40 on the spouts 66 of the hooks 58 and the deformation of the tabs 60, 62 of the hooks 58 in the position of the figure 7 , where it can be seen that the latch 42 is pushed towards the bottom of the groove 32.
  • the flange 40 is then moved, with the latch 42, in rotation about the axis of the disc 10 in the annular groove 32, from its mounting position shown in FIG. figure 6 , to its locking position, represented in figure 8 .
  • the solid portions 74 of the radially inner edge 44 of the flange 40 are aligned with the solid portions 52 of the edge 50 of the groove 32.
  • the latch 42 has rotated at the same time as the flange 40 and the locking of the flange annular 40 is to bring the second radial tabs 64 of the hooks 58 of the latch 42 downstream in the hollow portions 54 of the edge 50 of the groove 32, as shown in FIG. Figures 9 and 10 and to engage the beaks 66 of the hooks 58 on the downstream face of the edge 44 of the flange 40.
  • the flange 40 is supported by its radially outer end 48 on the feet 14 of the blades 12, the downstream face of the flat ring 56 of the latch 42 is supported on the upstream face of the inner edge 44 of the flange 40 whose downstream face bears on the solid portions 52 of the edge of the groove 32 of the disc 10, the upstream faces 68 of the spouts 66 of the hooks 58 of the latch 42 bear against the downstream face of the flange 40 and the radial tabs 64 hooks 58 are engaged between the solid portions 52 of the edge 50 of the groove 32 of the disc 10, so that the flange 40 - latch assembly 42 is immobilized in rotation and in translation on the disc 10.
  • the disassembly of the hooks 42 is achieved by axial thrust of the second radial lugs 64 upstream, by means of the aforementioned tools, then by rotation of the flange 40 and the latch 42 from the locking position shown in FIG. figure 8 , to the disassembly position shown in figure 6 .

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)

Claims (10)

  1. Rotorscheibe einer Turbomaschine, welche Schaufeln (12) umfasst, deren Füße (14) in die Rillen des Scheibenrands (10) montiert sind, und einen Ringflansch (40) mit einem radial äußeren Rand (48), welcher sich auf die Füße (14) der Schaufeln für deren axialen Halt stützt, und einen radial inneren konturierten Rand (44), der in eine Ringnut (32) der Scheibe (10) montiert ist und mit einem radial äußeren konturierten oder gezackten Rand (50) der Nut zusammenwirkt, um den in axialer Translation befindlichen Flansch auf der Scheibe zu arretieren, dadurch gekennzeichnet, dass ein ringförmiger Riegel (42) in die Ringnut (32) der Scheibe aufgenommen wird, um den sich drehenden Flansch (40) in der Ringnut (32) zu stoppen, wobei besagter Riegel (42) einen radial inneren konturierten oder gezackten Teil aufweist und drehbar in der Ringnut (32) zwischen einer Verriegelungsstellung des Flansches (40), in der die verfüllten Teile des radial inneren Teils des Riegel auf die hohlen Teile des äußeren Rands der Nut ausgerichtet sind, und einer Montage- und Demontagestellung in der Ringnut (32), in der die verfüllten Teile des radial inneren Teils des Schlosses auf die verfüllten Teile des äußeren Rands der Nut ausgerichtet sind, verschoben werden kann.
  2. Scheibe nach Anspruch 1, dadurch gekennzeichnet, dass der Riegel (42) Haken (58) umfasst, die dazu bestimmt sind, auf dem radial inneren Rand (44) des Flansches (40) und zwischen den verfüllten Teilen (52) des konturierten oder gezackten Rands (50) der Ringnut (32) elastisch in die Verriegelungsposition des Flansches (40) einzurasten.
  3. Scheibe nach Anspruch 2, dadurch gekennzeichnet, dass die Haken (58) des ringförmigen Riegels (42) auf den verfüllten Teilen seines radial inneren Teils geformt sind.
  4. Scheibe nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Haken (58) des Riegels (42) radiale Ansätze (60) umfassen, die sich von einem radial äußeren ringförmigen Teil (56) desselben zur Achse des Riegels (42) hin erstrecken, und axiale Ansätze (62), die an die radialen Ansätze (60) an einem ihrer Enden angeschlossen sind und an ihrem anderen Ende mit einem radial nach außen gerichteten Vorsprung (66), der ein Stützelement (68) des radial inneren Rands (44) des Flansches (40) bildet, enden.
  5. Scheibe nach Anspruch 4, dadurch gekennzeichnet, dass die Vorsprünge (66) der Haken des Riegels (42) dazu bestimmt sind, teilweise in den ringförmigen Rand der hohlen Teile (76) des konturierten oder gezackten Rands (44) des Flansches (40) einzugreifen, wenn der Flansch (40) durch axiale Translation in die Ringnut (32) der Scheibe (10) eingesetzt wird.
  6. Scheibe nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die verfüllten Teile (74) des konturierten oder gezackten Rands (44) des Flansches (40) in der Verriegelungsposition des Flansches (40) axial auf die verfüllten Teile (52) des konturierten Rands (50) der Ringnut (32) ausgerichtet sind, um den Flansch (40) und den Riegel (42) axial auf der Scheibe zu arretieren, und die verfüllten Teile des radial inneren konturierten Teils des Riegels (42), die in die hohlen Teile (76) des konturierten ringförmigen Rands (44) des Flansche 40) eingreifen, in die hohlen Teile (54) des ringförmigen konturierten Rands (50) der Nut (32) der Scheibe (10) eingreifen und transversal auf die letzteren ausgerichtet sind, um den Riegel (42) und den Flansch (40) auf der Scheibe (10) drehend festzustellen.
  7. Scheibe nach einem der Ansprüche 4 bis 6, dadurch gekennzeichnet, dass die axialen Ansätze (62) der Haken an ihrem mit den Vorsprüngen (66) versehenen Enden durch zweite radiale Ansätze (64), die sich in der den Vorsprüngen (66) entgegen gesetzten Richtung erstrecken, verlängert werden, wobei diese radialen Ansätze (64) Aufnahme- oder Eingriffsmittel (72), wie z.B. Öffnungen (72) enthalten, die mit Hilfe von Werkzeug durch Ziehen das Einrasten der Vorsprünge (66) am Rand (76) des Flansches (40) und durch Schieben das Lösen der Vorsprünge (66) von Rand (76) des Flansches (40) bei der Demontage des Flansches ermöglichen.
  8. Scheibe nach Anspruch 7, dadurch gekennzeichnet, dass die zweiten radialen Verriegelungsansätze (64) des Riegels (42), die in die hohlen Teile (54) des konturierten Rands (50) der ringförmigen Nut (32) in der Verriegelungsposition des Flanschs (40) eingerastet sind, eine im Wesentlichen den besagten hohlen Teilen (54) entsprechende Form haben.
  9. Scheibe nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der radiale äußere ringförmige Teil (56) des ringförmigen Riegels (42) in der Verriegelungsposition des Flansches (40) axial auf den radial inneren Rand (44) des Flansches (40) angelegt wird, der wiederum axial an die verfüllten Teile (52) des konturierten Rands (50) der ringförmigen Nut (32) angelegt wird, und axial zwischen dem radial äußeren Teil (56) des ringförmigen Riegels und den Vorsprüngen (66) der Haken (58), die durch den radial inneren Teil besagten Riegels (42) geformt werden, eingespannt wird.
  10. Turbomaschine, dadurch gekennzeichnet, dass sie eine Rotorscheibe nach einem der vorhergehenden Ansprüche umfasst.
EP05290544.5A 2004-04-09 2005-03-10 Turbomaschinenrotorscheibe mit einer Axialhalterung für die Laufschaufeln Expired - Lifetime EP1584794B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0403738A FR2868808B1 (fr) 2004-04-09 2004-04-09 Dispositif de retenue axiale d'aubes sur un disque de rotor d'une turbomachine
FR0403738 2004-04-09

Publications (2)

Publication Number Publication Date
EP1584794A1 EP1584794A1 (de) 2005-10-12
EP1584794B1 true EP1584794B1 (de) 2016-07-27

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Family Applications (1)

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EP05290544.5A Expired - Lifetime EP1584794B1 (de) 2004-04-09 2005-03-10 Turbomaschinenrotorscheibe mit einer Axialhalterung für die Laufschaufeln

Country Status (7)

Country Link
US (1) US7371050B2 (de)
EP (1) EP1584794B1 (de)
JP (1) JP4656983B2 (de)
CA (1) CA2503011C (de)
FR (1) FR2868808B1 (de)
RU (1) RU2358116C2 (de)
UA (1) UA85046C2 (de)

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RU2358116C2 (ru) 2009-06-10
RU2005110332A (ru) 2006-10-20
EP1584794A1 (de) 2005-10-12
JP2005299649A (ja) 2005-10-27
CA2503011C (fr) 2012-09-11
FR2868808B1 (fr) 2008-08-29
UA85046C2 (uk) 2008-12-25
FR2868808A1 (fr) 2005-10-14
CA2503011A1 (fr) 2005-10-09
US7371050B2 (en) 2008-05-13
JP4656983B2 (ja) 2011-03-23
US20050271511A1 (en) 2005-12-08

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