EP0095409A1 - Damping device for the vanes in the rotor of a turbo machine - Google Patents

Damping device for the vanes in the rotor of a turbo machine Download PDF

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Publication number
EP0095409A1
EP0095409A1 EP83400980A EP83400980A EP0095409A1 EP 0095409 A1 EP0095409 A1 EP 0095409A1 EP 83400980 A EP83400980 A EP 83400980A EP 83400980 A EP83400980 A EP 83400980A EP 0095409 A1 EP0095409 A1 EP 0095409A1
Authority
EP
European Patent Office
Prior art keywords
blades
damping member
platforms
damping
support disc
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
EP83400980A
Other languages
German (de)
French (fr)
Other versions
EP0095409B1 (en
Inventor
Jean Georges Bouiller
Jean-Claude Lucien Delonge
Marcel Louis Antoine Rigo
Didier Gilbert Zietek
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
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.)
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Publication date
Application filed by Societe Nationale dEtude et de Construction de Moteurs dAviation SNECMA, SNECMA SAS filed Critical Societe Nationale dEtude et de Construction de Moteurs dAviation SNECMA
Publication of EP0095409A1 publication Critical patent/EP0095409A1/en
Application granted granted Critical
Publication of EP0095409B1 publication Critical patent/EP0095409B1/en
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
    • F01D5/12—Blades
    • F01D5/22—Blade-to-blade connections, e.g. for damping vibrations
    • 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
    • F01D5/3092—Protective layers between blade root and rotor disc surfaces, e.g. anti-friction layers
    • 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
    • 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
    • F05D2260/00—Function
    • F05D2260/30—Retaining components in desired mutual position
    • F05D2260/38—Retaining components in desired mutual position by a spring, i.e. spring loaded or biased towards a certain position
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S416/00—Fluid reaction surfaces, i.e. impellers
    • Y10S416/50—Vibration damping features

Definitions

  • the present invention relates to a retractable damping device for blades of a turbomachine.
  • a device in which the damping member at right angles is embedded between the upstream face of the rim of the support disc and a flange.
  • the angle of this square member has a critical bending zone.
  • the damping member is disposed between two consecutive blades against the underside of the platforms and is remarkable in that one of its ends being placed in the middle part of the space between the blades and a support disc, which can pivot about a geometric axis perpendicular to a radial axis of the support disc and in the plane of the disc, it has an upper part which is conformed to constitute a projecting dihedral conforming to, under the action of centrifugal force, the re-entering dihedral formed by the platforms of the two consecutive blades.
  • the damping member passes under the veil of the blade during assembly or disassembly blade by blade. In addition, it is better positioned between the stilts of the blades so that jamming cannot occur. In order to optimize its resistant work under the platforms of the blades, the bearing surface of the damping members is larger because it extends under the common platforms of two blades.
  • the damping member is pivotally mounted around one of its ends which has a cylindrical boss engaged in a housing with a cylindrical bottom formed between two spoilers shaped in the middle part of a tooth of the support disc.
  • This arrangement has the advantage of the simplicity of its mechanism and of using gravity to maintain the damping member of the blades located in the upper part in the retracted position, and to allow the unitary disassembly of said blades.
  • the damping member is subjected to the action of an elastic member keeping said damping member in contact with the underside of the platforms of the blades.
  • the damper is free in the cavity formed by a tooth of the disc, the stilts and the platforms of two consecutive blades.
  • an elastic member is associated with it which presses said member on the underside of the wings of two consecutive platforms and which participates in the sequence mounting.
  • FIGs 1 and 2 there is shown a support disc 1 having housings 2 in which the feet 3 of the blades 4 are mounted.
  • the damping member 8 consists of a plate having an upper part 8a shaped to form a projecting dihedral conforming, under the action of centrifugal force, to the re-entrant dihedron formed by the platforms 6, 6a of the two consecutive blades 4.
  • the damping member 8 is pivotally mounted by one of its ends in the middle part of the space between the blades 4 and the support disc 1, along an axis perpendicular to a radial axis of the support disc.
  • the damping member 8 has at one of its ends a cylindrical boss 9 engaged in a housing 10 whose bottom 10a is cylindrical and which is formed between two spoilers 11 and 12 shaped in the middle part of the tooth 7 of the support disc 1.
  • the front spoiler 12 prevents the boss 9 from sliding forward when the engine is stopped.
  • the rear spoiler 11 supports the axial force, represented by an arrow in FIG. 1, due to the centrifugal force of the damping member and for this purpose it is therefore reinforced.
  • a hole 13 drilled in the cylindrical boss 9 makes it possible to position the center of gravity at the largest possible diameter, therefore as far as possible from the disc tooth.
  • the damping member 8 When the engine is running, the damping member 8 is pressed under the action of centrifugal force against the platforms 6, 6a of the blades, so that the upper part 8a of said protruding dihedral-shaped member comes to marry the dihedron reentrant formed by the platforms 6, 6a of two consecutive blades.
  • FIGS. 3, 4 and 5 Another embodiment of the damping device shown in FIGS. 3, 4 and 5 consists of a damping member 15 made of sheet metal cut in the shape of a cross and then folded longitudinally to form a projecting dihedral formed from the faces 15a, 15b and the four edges 15e, 15d, 15e, 15f are then folded in the shape of a gutter.
  • the upstream edge 15e receives in its concave part a helical torsion spring 16 which consists of two parts 16a, 16b whose free ends 17a, 17b are fixed in particular by welding on the internal face of the damping member 15, said parts 16a , 16b of the helical spring being connected by a loop 18 bearing against the support disc 1.
  • the rear edge 15f in the form of a gutter adapts to the curvature 19 of the rear veil of the blade 4.
  • the damping member 15 In operation at high speed, the damping member 15 is pressed by centrifugal force under the platforms 6, 6a of the blades, the spring 16 no longer being pressed against the tooth 7 of the disc 1, the damping takes place by friction. At low speeds, the spring 16 keeps the damping member 15 in contact with the platforms: 6, 6a and prevents the blade from rattling at low speed of rotation.
  • the ribs formed by the folded edges 15c, 15d, 15e, 15f provide rigidity which prevents buckling of the part.
  • the spring 16 ensures the positioning of the damping member under the platforms 6, 6a of the blades.
  • a blade 4 To mount a blade 4, it is inserted from the front into its cell 2. Then a damping member 15 is wedged in the rear part of a lateral cavity of the blade.
  • the damping member Due to its dihedral shape, the damping member is automatically positioned in the dihedral formed by the two platforms.
  • This arrangement can also be used to dampen the vibrations of stator vanes but, in this case, the stiffness of the spring must be greater.

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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)

Abstract

Dispositif d'amortissement escamotable pour aube d'une turbomachine, disposé entre deux aubes consécutives contre la face inférieure des plateformes desdites aubes. L'organe d'amortissement (8), monte pivotant par l'une de ses extrémités dans la partie médiane de l'espace entre les aubes (4) et un disque de support (1), suivant un axe perpendiculaire à un axe radial du disque de support (1), présente une partie supérieure (8a) conformée pour constituer un dièdre saillant épousant le dièdre rentrant constitué par les plateformes (6, 6a) des deux aubes (4) consécutives sous l'action de la force centrifuge.Retractable damping device for a turbine engine blade, disposed between two consecutive blades against the underside of the platforms of said blades. The damping member (8), pivots at one of its ends in the middle part of the space between the blades (4) and a support disc (1), along an axis perpendicular to a radial axis of the support disc (1), has an upper part (8a) shaped to constitute a protruding dihedral matching the re-entrant dihedral formed by the platforms (6, 6a) of the two consecutive blades (4) under the action of centrifugal force.

Description

La présente invention a pour objet un dispositif d'amortissement escamotable pour aubes d'une turbomachine.The present invention relates to a retractable damping device for blades of a turbomachine.

Pour limiter l'amplitude des vibrations des aubes d'une turbomachine lors de son fonctionnement, il est connu d'utiliser des dispositifs d'amortissement de vibrations des aubes.In order to limit the amplitude of the vibrations of the blades of a turbomachine during its operation, it is known to use devices for damping the vibrations of the blades.

D'un autre point de vue, celui de la maintenance, il est souhaitable de pouvoir procéder séparément au démontage des aubes et il faut donc que l'organe amortisseur ne soit pas un obstacle lors du démontage des aubes.From another point of view, that of maintenance, it is desirable to be able to disassemble the blades separately and it is therefore necessary that the damping member is not an obstacle during the disassembly of the blades.

On connaît un dispositif dans lequel l'organe amortisseur en équerre est encastré entre la face amont de la jante du disque de support et une bride. Toutefois, l'angle de cet organe en équerre présente une zone critique de flexion.A device is known in which the damping member at right angles is embedded between the upstream face of the rim of the support disc and a flange. However, the angle of this square member has a critical bending zone.

Il est également connu d'utiliser d'autres dispositifs d'amortissement mais qui ne donnent pas entière satisfaction.It is also known to use other damping devices but which are not entirely satisfactory.

Conformément à la présente invention, l'organe d'amortissement est disposé entre deux aubes consécutives contre la face inférieure des plateformes et est remarquable en ce que l'une de ses extrémités étant placée dans la partie médiane de l'espace entre les aubes et un disque de support, pouvant pivoter autour d'un axe géométrique perpendiculaire à un axe radial du disque de support et dans le plan du disque, il présente une partie supérieure confor- pour constituer un dièdre saillant épousant, sous l'action de la force centrifuge, le dièdre rentrant constitué par les plateformes des deux aubes consécutives.According to the present invention, the damping member is disposed between two consecutive blades against the underside of the platforms and is remarkable in that one of its ends being placed in the middle part of the space between the blades and a support disc, which can pivot about a geometric axis perpendicular to a radial axis of the support disc and in the plane of the disc, it has an upper part which is conformed to constitute a projecting dihedral conforming to, under the action of centrifugal force, the re-entering dihedral formed by the platforms of the two consecutive blades.

nette disposition permet à l'organe amortisseur de passer sous le voile de l'aube lors du montage ou du démontage aube par aube. De plus, il est mieux positionné entre les échasses des aubes pour qu'un coincement ne puisse se produire. Afin d'optimiser son travail résistant sous les plateformes des aubes, la surface d'appui des organes amortisseurs est plus grande du fait qu'elle s'étend sous les plateformes communes de deux aubes.clear arrangement allows the damping member to pass under the veil of the blade during assembly or disassembly blade by blade. In addition, it is better positioned between the stilts of the blades so that jamming cannot occur. In order to optimize its resistant work under the platforms of the blades, the bearing surface of the damping members is larger because it extends under the common platforms of two blades.

Selon un mode de réalisation de l'invention, l'organe d'amortissement est monté pivotant autour de l'une de ses extrémités qui présente un bossage cylindrique engagé dans un logement à fond cylindrique ménagé entre deux becquets conformés dans la partie médiane d'une dent du disque de support.According to one embodiment of the invention, the damping member is pivotally mounted around one of its ends which has a cylindrical boss engaged in a housing with a cylindrical bottom formed between two spoilers shaped in the middle part of a tooth of the support disc.

Cette disposition présente l'avantage de la simplicité de son mécanisme et d'utiliser la pesanteur pour maintenir l'organe amortisseur des aubes situées en partie haute en position d'escamotage, et de permettre le démontage unitaire desdites aubes.This arrangement has the advantage of the simplicity of its mechanism and of using gravity to maintain the damping member of the blades located in the upper part in the retracted position, and to allow the unitary disassembly of said blades.

Selon un autre mode de réalisation de l'invention, l'organe d'amortissement est soumis à l'action d'un organe élastique maintenant ledit organe d'amortissement en contact avec la face inférieure des plateformes des aubes. Cette disposition met à profit la présence d'un voile arrière de l'aube pour retenir axialement l'organe amortisseur.According to another embodiment of the invention, the damping member is subjected to the action of an elastic member keeping said damping member in contact with the underside of the platforms of the blades. This arrangement takes advantage of the presence of a rear veil of the blade to axially retain the damping member.

De ce fait l'amortisseur est libre dans la cavité formée par une dent du disque, les échasses et les plateformes de deux aubes consécutives.Therefore the damper is free in the cavity formed by a tooth of the disc, the stilts and the platforms of two consecutive blades.

Pour éviter que l'organe amortisseur ne batte, à bas régime, ou qu'il ne prenne une position incorrecte, on lui associe un organe élastique qui plaque ledit organe sur la face inférieure des ailes de deux plateformes consécutives et qui participe à la séquence de montage.To prevent the shock-absorbing member from beating at low speed, or from taking an incorrect position, an elastic member is associated with it which presses said member on the underside of the wings of two consecutive platforms and which participates in the sequence mounting.

D'autres caractéristiques et avantages de l'invention seront mieux compris à la lecture de la description qui va suivre de plusieurs modes de réalisation et en se référant aux dessins annexés, sur lesquels :

  • - la figure 1 est une vue en coupe axiale partielle d'une aube et d'un disque de support des aubes, comportant un dispositif d'amortissement suivant l'invention ;
  • - la figure 2 est une vue en coupe suivant la ligne II-II de la figure 1 ;
  • - la figure 3 est une vue en coupe axiale partielle d'une aube munie d'un autre mode de réalisation du dispositif d'amortissement ;
  • - la figure 4 est une vue en perspective du dispositif d'amortissement représenté à la figure 3 ; et
  • - la figure 5 est une vue en plan de deux aubes avec un arraché montrant le dispositif d'amortissement de la figure 3.
Other characteristics and advantages of the invention will be better understood on reading the following description of several embodiments and with reference to the appended drawings, in which:
  • - Figure 1 is a partial axial sectional view of a blade and a blade support disc, comprising a damping device according to the invention;
  • - Figure 2 is a sectional view along line II-II of Figure 1;
  • - Figure 3 is a partial axial sectional view of a blade provided with another embodiment of the damping device;
  • - Figure 4 is a perspective view of the damping device shown in Figure 3; and
  • FIG. 5 is a plan view of two blades with a cutaway showing the damping device of FIG. 3.

Aux figures 1 et 2, on a représenté un disque de support 1 présentant des logements 2 dans lesquels sont montés les pieds 3 des aubes 4. Dans l'espace délimité par les échasses 5, 5a et les plateformes 6, 6a de deux aubes consécutives 4 et une dent 7 du disque 1 est disposé un organe amortisseur 8 des vibrations des aubes 4.In Figures 1 and 2, there is shown a support disc 1 having housings 2 in which the feet 3 of the blades 4 are mounted. In the space delimited by the stilts 5, 5a and the platforms 6, 6a of two consecutive blades 4 and a tooth 7 of the disc 1 is arranged a member damper 8 of the vibrations of the blades 4.

L'organe amortisseur 8 est constitué d'une plaquette présentant une partie supérieure 8a conformée pour constituer un dièdre saillant épousant, sous l'action de la force centrifuge, le dièdre rentrant constitué par les plateformes 6, 6a des deux aubes consécutives 4.The damping member 8 consists of a plate having an upper part 8a shaped to form a projecting dihedral conforming, under the action of centrifugal force, to the re-entrant dihedron formed by the platforms 6, 6a of the two consecutive blades 4.

L'organe d'amortissement 8 est monté pivotant par l'une de ses extrémités dans la partie médiane de l'espace entre les aubes 4 et le disque de support 1, suivant un axe perpendiculaire à un axe radial du disque de support.The damping member 8 is pivotally mounted by one of its ends in the middle part of the space between the blades 4 and the support disc 1, along an axis perpendicular to a radial axis of the support disc.

A cet effet l'organe amortisseur 8 présente à l'une de ses extrémités un bossage cylindrique 9 engagé dans un logement 10 dont le fond 10a est cylindrique et qui est ménagé entre deux becquets 11 et 12 conformés dans la partie médiane de la dent 7 du disque de support 1. Le becquet avant 12 empêche le bossage 9 de glisser à l'avant lorsque le moteur est arrêté. Le becquet arrière 11 supporte l'effort axial, représenté par une flèche sur la figure 1, dû à la force centrifuge de l'organe amortisseur et dans ce but il est donc renforcé.For this purpose, the damping member 8 has at one of its ends a cylindrical boss 9 engaged in a housing 10 whose bottom 10a is cylindrical and which is formed between two spoilers 11 and 12 shaped in the middle part of the tooth 7 of the support disc 1. The front spoiler 12 prevents the boss 9 from sliding forward when the engine is stopped. The rear spoiler 11 supports the axial force, represented by an arrow in FIG. 1, due to the centrifugal force of the damping member and for this purpose it is therefore reinforced.

Afin d'éviter tout coincement un jeu important est prévu entre le bossage cylindrique 9 de l'organe amortisseur et son logement entre les becquets 11 et 12.In order to avoid any jamming, a large clearance is provided between the cylindrical boss 9 of the damping member and its housing between the spoilers 11 and 12.

Si les balourds, créés par les différences de masse, sont trop importants, il est possible de fraiser la surface plane de la partie rectangulaire de l'organe amortisseur.If the imbalances created by the mass differences are too great, it is possible to mill the flat surface of the rectangular part of the damping member.

Par ailleurs un trou 13 percé dans le bossage cylindrique 9 permet de positionner le centre de gravité au plus grand diamètre possible, donc le plus loin possible de la dent du disque.Furthermore, a hole 13 drilled in the cylindrical boss 9 makes it possible to position the center of gravity at the largest possible diameter, therefore as far as possible from the disc tooth.

Lorsque le moteur est en fonctionnement, l'organe amortisseur 8 est plaqué sous l'action de la force centrifuge contre les plateformes 6, 6a des aubes, de telle sorte que la partie supérieure 8a dudit organe en forme de dièdre saillant vient épouser le dièdre rentrant constitué par les plateformes 6, 6a de deux aubes consécutives .When the engine is running, the damping member 8 is pressed under the action of centrifugal force against the platforms 6, 6a of the blades, so that the upper part 8a of said protruding dihedral-shaped member comes to marry the dihedron reentrant formed by the platforms 6, 6a of two consecutive blades.

Lorsque le moteur est à l'arrêt et pour les aubes situées dans la partie haute du disque l'organe amortisseur 8 vient occuper la position représentée en trait interrompu sur les figures 1 et 2, sous l'action de la pesanteur. Dans cette position, il est facile de monter et démonter l'une des aubes 4 dont le voile 14 peut passer au-dessus de l'organe amortisseur en position escamotée.When the engine is stopped and for the blades located in the upper part of the disc, the damping member 8 comes to occupy the position shown in broken lines in Figures 1 and 2, under the action of gravity. In this position, it is easy to assemble and disassemble one of the vanes 4, the web 14 of which can pass over the damping member in the retracted position.

Un autre mode de réalisation du dispositif d'amortissement représenté aux figures 3, 4 et 5 est constitué d'un organe amortisseur 15 en tôle découpée en forme de croix puis pliée longitudinalement pour constituer un dièdre saillant formé des faces 15a, 15b et dont les quatre bords 15e, 15d, 15e, 15f sont ensuite repliés en forme de gouttière. Le bord amont 15e reçoit dans sa partie concave un ressort hélicoïdal de torsion 16 qui est constitué de deux parties 16a, 16b dont les extrémités libres 17a, 17b sont fixées notamment par soudure sur la face interne de l'organe amortisseur 15, lesdites parties 16a, 16b du ressort hélicoïdal étant reliées par une boucle 18 en appui contre le disque de support 1.Another embodiment of the damping device shown in FIGS. 3, 4 and 5 consists of a damping member 15 made of sheet metal cut in the shape of a cross and then folded longitudinally to form a projecting dihedral formed from the faces 15a, 15b and the four edges 15e, 15d, 15e, 15f are then folded in the shape of a gutter. The upstream edge 15e receives in its concave part a helical torsion spring 16 which consists of two parts 16a, 16b whose free ends 17a, 17b are fixed in particular by welding on the internal face of the damping member 15, said parts 16a , 16b of the helical spring being connected by a loop 18 bearing against the support disc 1.

Des modifications pourront être apportées à ce mode de réalisation illustré à titre d'exemple. C'est ainsi que l'on pourrait inverser les appuis du ressort hélicoïdal 16, les branches 17a et 17b étant alors à un écartement plus grand que la boucle 18. C'est ainsi également que le ressort hélicoïdal pourrait être remplacé par un ressort à lame.Modifications may be made to this embodiment illustrated by way of example. This is how we could reverse the supports of the coil spring 16, the branches 17a and 17b then being at a spacing greater than the loop 18. It is thus also that the helical spring could be replaced by a leaf spring.

Lorsque l'organe amortisseur est en place dans le logement délimité par une dent du disque 1, les échasses 5 et les plateformes 6, 6a de deux aubes 4 consécutives, ses faces 15a, 15b formant un dièdre saillant, sont en appui sous l'action du ressort 16 contre les faces inférieures en forme de dièdre des plateformes 6, 6a des aubes.When the damping member is in place in the housing delimited by a tooth of the disc 1, the stilts 5 and the platforms 6, 6a of two consecutive blades 4, its faces 15a, 15b forming a projecting dihedral, are supported under the action of the spring 16 against the dihedral-shaped lower faces of the platforms 6, 6a of the blades.

Le bord arrière 15f en forme de gouttière s'adapte à la courbure 19 du voile arrière de l'aube 4.The rear edge 15f in the form of a gutter adapts to the curvature 19 of the rear veil of the blade 4.

En fonctionnement à haut régime l'organe amortisseur 15 est plaqué par la force centrifuge sous les plateformes 6, 6a des aubes, le ressort 16 n'étant plus plaqué contre la dent 7 du disque 1, l'amortissement s'effectue par frottement. Aux bas régimes, le ressort 16 maintient l'organe amortisseur 15 en contact avec les plateformes:6, 6a et empêche l'aube de cliqueter à vitesse de rotation faible.In operation at high speed, the damping member 15 is pressed by centrifugal force under the platforms 6, 6a of the blades, the spring 16 no longer being pressed against the tooth 7 of the disc 1, the damping takes place by friction. At low speeds, the spring 16 keeps the damping member 15 in contact with the platforms: 6, 6a and prevents the blade from rattling at low speed of rotation.

Les nervures formées par les bords repliés 15c, 15d, 15e, 15f apportent une rigidité qui s'oppose au flambage de la pièce.The ribs formed by the folded edges 15c, 15d, 15e, 15f provide rigidity which prevents buckling of the part.

A l'arrêt le ressort 16 assure le positionnement de l'organe amortisseur sous les plateformes 6, 6a des aubes.When stopped, the spring 16 ensures the positioning of the damping member under the platforms 6, 6a of the blades.

Pour procéder au montage d'une aube 4, on insère celle-ci par l'avant dans son alvéole 2. Ensuite on coince un organe amortisseur 15 dans la partie arrière d'une cavité latérale de l'aube.To mount a blade 4, it is inserted from the front into its cell 2. Then a damping member 15 is wedged in the rear part of a lateral cavity of the blade.

On introduit l'aube adjacente et au fur et à mesure que le voile arrière 14 de cette deuxième aube progresse vers l'arrière du disque il écrase le ressort 16 de l'organe amortisseur 15 puis le ressort se détend lorsque le voile 14 de l'aube parvient à l'aplomb du becquet arrière du disque 1, et, presque totalement détendu, il plaque l'amortisseur sur les ailes des deux plateformes 6, 6a adjacentes.We introduce the adjacent dawn and as the rear veil 14 of this second blade progresses towards the rear of the disc it crushes the spring 16 of the damping member 15 then the spring relaxes when the veil 14 of the dawn reaches directly above the rear spoiler of the disc 1 , and, almost completely relaxed, it places the shock absorber on the wings of the two adjacent platforms 6, 6a.

En raison de sa forme en dièdre, l'organe amortisseur se positionne automatiquement dans le dièdre formé par les deux plateformes.Due to its dihedral shape, the damping member is automatically positioned in the dihedral formed by the two platforms.

Pour démonter une aube 4 il faut écraser le ressort 16 de l'organe amortisseur, soit en tirant l'amortisseur par l'avant à l'aide d'une pince spéciale, soit en appuyant sur l'organe amortisseur 15 à l'aide d'une lame introduite radialement par le jeu 20 existant entre deux plateformes 6, 6a (voir figure 2).To dismantle a vane 4, it is necessary to crush the spring 16 of the damper member, either by pulling the damper from the front using a special pliers, or by pressing the damper member 15 using a blade introduced radially by the clearance 20 existing between two platforms 6, 6a (see FIG. 2).

Cette disposition peut être utilisée également pour amortir les vibrations d'aubes de stator mais, dans ce cas, la raideur du ressort doit être plus importante.This arrangement can also be used to dampen the vibrations of stator vanes but, in this case, the stiffness of the spring must be greater.

Bien entendu, l'invention n'est pas limitative et l'homme de l'art pourra y apporter des modifications sans sortir pour cela du domaine de l'invention.Of course, the invention is not limiting and those skilled in the art may make modifications to it without departing from the scope of the invention.

Claims (6)

1. Dispositif d'amortissement escamotable pour aube d'une turbomachine, disposé entre deux aubes consécutives contre la face inférieure des plateformes desdites aubes, caractérisé en ce que l'organe d'amortissement (8, 15), dont une extrémité est placée dans la partie médiane de l'espace entre les aubes (4) et un disque de support (1), peut pivoter autour d'un axe géométrique perpendiculaire à un axe radial du disque de support (1) et dans le plan du disque, et présente une partie supérieure (8a, 15a, 15b) conformée pour constituer un dièdre saillant, épousant, sous l'action de la force centrifuge, le dièdre rentrant constitué par les plateformes (6, 6a) des deux aubes (4) consécutives.1. Retractable damping device for blade of a turbomachine, disposed between two consecutive blades against the underside of the platforms of said blades, characterized in that the damping member (8, 15), one end of which is placed in the middle part of the space between the blades (4) and a support disc (1), can pivot around a geometric axis perpendicular to a radial axis of the support disc (1) and in the plane of the disc, and has an upper part (8a, 15a, 15b) shaped to constitute a protruding dihedral, marrying, under the action of centrifugal force, the re-entrant dihedral formed by the platforms (6, 6a) of the two consecutive blades (4). 2. Dispositif suivant la revendication 1, caractérisé en ce que l'organe d'amortissement (8) est monté pivotant autour de l'une de ses extrémités qui présente un bossage cylindrique (9) engagé dans un logement (10) à fond cylindrique ménagé entre deux becquets (11, 12) conformés dans la partie médiane d'une dent du disque de support (1).2. Device according to claim 1, characterized in that the damping member (8) is pivotally mounted around one of its ends which has a cylindrical boss (9) engaged in a housing (10) with a cylindrical bottom formed between two spoilers (11, 12) shaped in the middle part of a tooth of the support disc (1). 3. Dispositif suivant la revendication 1, caractérisé en ce que l'organe d'amortissement (15) est soumis à l'action d'un organe élastique (16) maintenant ledit organe d'amortissement (15) en contact avec la face inférieure des plateformes (6, 6a) des aubes (4).3. Device according to claim 1, characterized in that the damping member (15) is subjected to the action of an elastic member (16) holding said damping member (15) in contact with the underside platforms (6, 6a) of the blades (4). 4. Dispositif suivant les revendications 1 et 3, caractérisé en ce que l'organe d'amortissement (15) est en tôle pliée et son bord arrière (15f) est conformé pour présenter une surface courbe s'adaptant à la courbure (19) du voile arrière (14) de l'aube.4. Device according to claims 1 and 3, characterized in that the damping member (15) is made of folded sheet and its rear edge (15f) is shaped to have a curved surface adapting to the curvature (19) of the rear veil (14) of the blade. 5. Dispositif suivant les revendications 3 et 4, caractérisé en ce que l'organe élastique (16) est constitué d'un ressort hélicoïdal en deux parties (16a, 16b) dont les extrémités libres (17a, 17b) sont fixées sur l'organe d'amortissement (15) et dont une boucle (18) reliant les deux parties du ressort est en appui contre le disque de support (1).5. Device according to claims 3 and 4, characterized in that the elastic member (16) consists of a helical spring in two parts (16a, 16b) whose free ends (17a, 17b) are fixed on the damping member (15) and including a loop (18) connecting the two parts of the spring bears against the support disc (1). 6. Dispositif suivant les revendications 3 et 4, caractérisé en ce que l'organe élastique est un ressort à lame.6. Device according to claims 3 and 4, characterized in that the elastic member is a leaf spring.
EP83400980A 1982-05-18 1983-05-17 Damping device for the vanes in the rotor of a turbo machine Expired EP0095409B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8208635 1982-05-18
FR8208635A FR2527260A1 (en) 1982-05-18 1982-05-18 RETRACTABLE DAMPING DEVICE FOR AUBES OF A TURBOMACHINE

Publications (2)

Publication Number Publication Date
EP0095409A1 true EP0095409A1 (en) 1983-11-30
EP0095409B1 EP0095409B1 (en) 1986-07-23

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Application Number Title Priority Date Filing Date
EP83400980A Expired EP0095409B1 (en) 1982-05-18 1983-05-17 Damping device for the vanes in the rotor of a turbo machine

Country Status (4)

Country Link
US (1) US4516910A (en)
EP (1) EP0095409B1 (en)
DE (1) DE3364694D1 (en)
FR (1) FR2527260A1 (en)

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Also Published As

Publication number Publication date
US4516910A (en) 1985-05-14
EP0095409B1 (en) 1986-07-23
FR2527260B1 (en) 1984-12-21
DE3364694D1 (en) 1986-08-28
FR2527260A1 (en) 1983-11-25

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