EP0083289B1 - Rotor wheel of a turbo jet engine comprising a device for axially and radially retaining the rotor blades on the rotor wheel - Google Patents

Rotor wheel of a turbo jet engine comprising a device for axially and radially retaining the rotor blades on the rotor wheel Download PDF

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Publication number
EP0083289B1
EP0083289B1 EP82402387A EP82402387A EP0083289B1 EP 0083289 B1 EP0083289 B1 EP 0083289B1 EP 82402387 A EP82402387 A EP 82402387A EP 82402387 A EP82402387 A EP 82402387A EP 0083289 B1 EP0083289 B1 EP 0083289B1
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EP
European Patent Office
Prior art keywords
blade
groove
root
disc
rotor
Prior art date
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Expired
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EP82402387A
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German (de)
French (fr)
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EP0083289A1 (en
Inventor
Jean-Claude Dhuic
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
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Societe Nationale dEtude et de Construction de Moteurs dAviation SNECMA
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Publication of EP0083289A1 publication Critical patent/EP0083289A1/en
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    • 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 turbomachine rotor wheel provided with an axial and radial blade retaining device on the disc, capable of preventing the blade root and the airfoils from matting, and more particularly a wedge wedge. between the foot of the blade and the bottom of the groove provided in the rim of the rotor disc, according to the first part of claim 1.
  • Axial and radial blade retaining devices are known, such as that described in French Patent No. 2,345,605 and which consists of a shim which is placed between the blade root and the bottom of the groove. so as to press the upper part of the dovetail root against the lateral teeth of the groove, the wedge being held in the axial direction by a U-bolt which cooperates with corresponding notches provided in the foot blade and in the teeth of the groove; the system is simple and efficient.
  • To facilitate, or even make possible the assembly and disassembly of the assembly there are however between the wedge, the blade root and the bottom of the groove of the games (at least for most of the blades) which prove harmful in use. Indeed, during autorotation or low-speed rotation of the rotor, the centrifugal force exerted on the blades is no longer sufficient to keep the blade roots pressed against both the oblique faces of the grooves.
  • the wedge described by the first cited patent consists of three longitudinal pieces, independent, two lateral and a central.
  • the two lateral pieces bear at the ends of two adjacent faces of the heels provided so as to be able to be applied against the front and rear face of the disc, on either side of the groove and against the radial ends of the blade roots.
  • These two symmetrical parts are introduced into the space between the blade root and the bottom of the groove and are separated by the central part in a shape approximately complementary to the remaining space.
  • This part comprises a housing receiving an elastic member bearing against the bottom of the groove.
  • the three parts are, after installation, secured by a bolt.
  • the second patent cited describes a wedge having two side pieces identical to those of the previous patent, but a central piece consisting of two elements and an additional blocking wedge.
  • One of the elements forms a spacer, capable of being elastically deformed in the axial plane, and cooperates with a housing provided in the bar forming the other element and intended to be placed against the bottom of the groove.
  • the installation of the device is done, as before, by introduction of the lateral parts, of the bar, then of the spacer. Is then placed between the ends of the bar and the spacer blocking block which maintains the spacer in pressure against the bar and the blade root.
  • a bolt holds the different parts together and ensures locking.
  • the subject of the invention is a turbomachine rotor wheel provided with a retaining device of the same kind as those previously described, but comprising only a lower number of parts and above all forming an assembly capable of being put in place. or removed in one operation.
  • FIG. 1 shows an exploded view of a device for retaining a rotor blade.
  • Figure 2 is an exploded view of a wedge according to the invention.
  • Figure 3 is a longitudinal sectional view of an element forming the wedge.
  • Figure 4 is a sectional view through the radial plane passing through the middle of the groove of the retaining device according to the invention.
  • Figure 1 shows an exploded view of an axial and radial retaining device of a rotor blade.
  • the rotor disc 1 has in its rim axial grooves 2 having a dovetail section.
  • teeth 3 provided between the grooves bear grooves 4 facing each other, the bottom of which is parallel to the radial plane passing through the middle of the groove.
  • the blade 5, the foot 6 of which has a dovetail shape corresponding to that of the groove, comprises upstream a heel-shaped extension 7, carrying grooves laterally 8.
  • a U-shaped lock 11 of thickness equal to the distance separating the lateral edges of the grooves 4 of the teeth, carries a cutout 12 whose upper part, close to the horizontal branch of the U, has a slot.
  • the cross section of this slot corresponding to the part of the heel 7 between the grooves 8.
  • the central part of the cut has a cross section corresponding to the cross section of the wedge 13.
  • the assembly is carried out as follows: after having slid the blade root 6 into the groove 2, the lock 11 is introduced between the grooves 4 and 8 of the teeth and of the blade root. The lock is then in abutment against the heel 7. The shim 13 is then introduced into the central part of the cutout 12 and between the blade root 6 and the bottom 14 of the groove 2. The shim applies the tail part d dovetail of the blade root against the corresponding parts of the cell constituting the groove 2 of the disc 1.
  • the wedge 13 (FIG. 2) consists of three assembled elements: an elongated part 15, a flexible blade 16 and an axis 17, the mode of cooperation of which will be described later.
  • the elongated part 15 carries, in its longitudinal plane of symmetry, a slot 18 extending over almost its entire length.
  • Two bridges 190 and 200 are provided at the front 19 and rear 20 ends of the part.
  • the bridge 200 formed at the rear end carries a groove 21 the bottom of which has a part, approximately parallel to the lower plane of the part which can be connected to another part 22, inclined towards the inside of the slot and joining the lower shot.
  • the part has at the front end 19 a cross section of height less than that of the rear end 20.
  • the longitudinal sides 181 and 182 of the part 15 are pierced by two coaxial orifices 23 with an axis perpendicular to the plane of longitudinal symmetry of the part.
  • the flexible blade 16 has a thickness less than that of the slot 18 and a length approximately equal to that of the slot and is pierced perpendicular to its longitudinal plane of symmetry with an orifice 24.
  • the blade is formed on either side of this orifice by two branches 25 and 26 whose upper and lower sides are designated respectively by the references 251, 261, 252, 262 respectively form obtuse angles.
  • the branch 25 carries at its upstream free end 27 a cutout 28 in the form of a right-angled dihedral whose planes are connected by a rounded 28 ′ and the end of the branch 26 has a flat bearing 29.
  • a cutout 28 in the form of a right-angled dihedral whose planes are connected by a rounded 28 ′ and the end of the branch 26 has a flat bearing 29. The function of these cutting and bearing will later specified.
  • the wedge 13 is formed by introducing the flexible blade 16 into the slot 18 of the part 15, the bearing 29 of the branch 26 resting on the horizontal bottom of the groove 21, then by connecting them via the axis 17 passing through the orifices 23 of the wedge and 24 of the blade. Therefore the three parts 15, 16, 17 form the shim 13 itself. It should be noted that the angle which the branches of the blade make between them, causes the end 27 to protrude from the lower plane of the wedge when the part 29 rests on the bottom of the groove 21.
  • the shim 13 is introduced, as previously described, into the central cutout 12 of the latch 11 between the blade root 6 and the bottom 14 of the groove of the disc.
  • the cutout 28 of the end of the flexible blade then comes, through the groove 2, to cover the upstream face of the rotor disc.
  • the tool is then dismantled maintaining the stress exerted between the part 15 and the blade 16, which places the horizontal face of the dihedron 28 in abutment on the bottom 14 of the groove 2 and the vertical face of the dihedron 28 in abutment on the face upstream of the disc 1.
  • the shim 13 is thus locked in the axial direction of upstream downstream. Locking in the opposite direction, from downstream to upstream, can be ensured in a known manner by a flange of the front cover coming to bear against the end 19 of the wedge.
  • the elasticity of the blade 16 supports (directly upstream, indirectly via the bridge 200 towards the rear) the wedge 13 on the bottom of the groove.
  • the upper middle of the blade 16 comes into abutment by a bearing 31 on the lower middle part of the blade root, which avoids rattling.
  • the force then exerted is of the order of 200 daN, sufficient to prevent the blade from clicking when the rotor turns in autorotation.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)

Description

L'invention concerne une roue de rotor de turbomachine munie d'un dispositif de retenue axiale et radiale d'aubes sur le disque, susceptible d'éviter le matage des pieds d'aube et des alvéoles, et plus particulièrement d'une cale logée entre le pied de l'aube et le fond de la rainure prévue dans la jante du disque du rotor, selon la première partie de la revendication 1.The invention relates to a turbomachine rotor wheel provided with an axial and radial blade retaining device on the disc, capable of preventing the blade root and the airfoils from matting, and more particularly a wedge wedge. between the foot of the blade and the bottom of the groove provided in the rim of the rotor disc, according to the first part of claim 1.

On connaît des dispositifs de retenue axiale et radiale d'aubes telles que celui décrit dans le brevet français n° 2 345 605 et qui est constitué d'une cale que l'on dispose entre le pied d'aube et le fond de la rainure de manière à plaquer la partie supérieure du pied d'aube en queue d'aronde contre les dents latérales de la rainure, la cale étant maintenue dans le sens axial par un verrou en U qui coopère avec des encoches correspondantes prévues dans le pied d'aube et dans les dents de la rainure ; le système est simple et efficace. Pour faciliter, ou même rendre possible le montage et le démontage de l'ensemble, il existe toutefois entre la cale, le pied d'aube et le fond de la rainure des jeux (au moins pour la plupart des aubes) qui se révèlent nuisibles à l'usage. En effet, lors de l'autorotation ou de la rotation à faible vitesse du rotor, la force centrifuge qui s'exerce sur les aubes n'est plus suffisante pour maintenir les pieds d'aube plaqués à la fois contre les deux faces obliques des rainures.Axial and radial blade retaining devices are known, such as that described in French Patent No. 2,345,605 and which consists of a shim which is placed between the blade root and the bottom of the groove. so as to press the upper part of the dovetail root against the lateral teeth of the groove, the wedge being held in the axial direction by a U-bolt which cooperates with corresponding notches provided in the foot blade and in the teeth of the groove; the system is simple and efficient. To facilitate, or even make possible the assembly and disassembly of the assembly, there are however between the wedge, the blade root and the bottom of the groove of the games (at least for most of the blades) which prove harmful in use. Indeed, during autorotation or low-speed rotation of the rotor, the centrifugal force exerted on the blades is no longer sufficient to keep the blade roots pressed against both the oblique faces of the grooves.

A chaque tour les aubes passent d'une position d'appui sur un des côtés de l'alvéole à une position d'appui sur l'autre côté. Cela produit un cliquetis et, ce qui est plus grave, un matage qui endommage très sérieusement les surfaces en contact. Si un tel dommage est déjà difficilement acceptable pour les pièces facilement remplaçables, telles que les cales ou à la rigueur les aubes, il n'en est pas de même pour le disque de rotor pour lequel de tels dommages sont absolument inacceptables.At each turn the blades pass from a support position on one side of the cell to a support position on the other side. This produces a rattling and, what is more serious, a mat which very seriously damages the surfaces in contact. If such damage is already difficult to accept for easily replaceable parts, such as shims or, if need be, the blades, it is not the same for the rotor disc for which such damage is absolutely unacceptable.

C'est ainsi que les brevets français numéros 2 300 215 et 2426151 proposent des solutions qui font appel à des cales comportant une partie élastique susceptible de maintenir le contact permanent entre le pied d'aube et la rainure. La cale décrite par le premier brevet cité est constituée de trois pièces longitudinales, indépendantes, deux latérales et une centrale. Les deux pièces latérales portent aux extrémités de deux faces adjacentes des talons prévus de manière à pouvoir s'appliquer contre la face avant et arrière du disque, de part et d'autre de la rainure et contre les extrémités radiales des pieds d'aube. Ces deux pièces, symétriques, sont introduites dans l'espace compris entre le pied d'aube et le fond de la rainure et sont écartées par la pièce centrale de forme approximativement complémentaire de l'espace restant. Cette pièce comporte un logement recevant un organe élastique prenant appui contre le fond de la rainure. Les trois pièces sont, après mise en place, solidarisées par un boulon.This is how the French patents numbers 2 300 215 and 2 426 151 offer solutions which use shims comprising an elastic part capable of maintaining permanent contact between the blade root and the groove. The wedge described by the first cited patent consists of three longitudinal pieces, independent, two lateral and a central. The two lateral pieces bear at the ends of two adjacent faces of the heels provided so as to be able to be applied against the front and rear face of the disc, on either side of the groove and against the radial ends of the blade roots. These two symmetrical parts are introduced into the space between the blade root and the bottom of the groove and are separated by the central part in a shape approximately complementary to the remaining space. This part comprises a housing receiving an elastic member bearing against the bottom of the groove. The three parts are, after installation, secured by a bolt.

Le second brevet cité décrit une cale présentant deux pièces latérales identiques à celles du brevet précédent, mais une pièce centrale constituée de deux éléments et d'une cale de blocage supplémentaire. Un des éléments forme une cale d'écartement, susceptible d'être déformée élastiquement dans le plan axial, et coopère avec un logement prévu dans la barrette formant l'autre élément et destinée à être placée contre le fond de la rainure. La mise en place du dispositif se fait, comme précédemment, par introduction des pièces latérales, de la barrette, puis de la cale d'écartement. On place alors entre les extrémités de la barrette et de la cale d'écartement la cale de blocage qui maintient la cale d'écartement en pression contre la barrette et le pied d'aube. Un boulon maintient les différentes pièces entre elles et assure le verrouillage.The second patent cited describes a wedge having two side pieces identical to those of the previous patent, but a central piece consisting of two elements and an additional blocking wedge. One of the elements forms a spacer, capable of being elastically deformed in the axial plane, and cooperates with a housing provided in the bar forming the other element and intended to be placed against the bottom of the groove. The installation of the device is done, as before, by introduction of the lateral parts, of the bar, then of the spacer. Is then placed between the ends of the bar and the spacer blocking block which maintains the spacer in pressure against the bar and the blade root. A bolt holds the different parts together and ensures locking.

La déformation élastique de la cale d'écartement, lorsque celle-ci se trouve en place, développe des forces de contact suffisant pour maintenir le pied d'aube quelle que soit la vitesse de rotation du rotor.The elastic deformation of the spacer, when it is in place, develops sufficient contact forces to maintain the blade root regardless of the speed of rotation of the rotor.

Le grand nombre de pièces de l'une ou l'autre de ces solutions de l'art antérieur rend toutefois délicat le montage et le démontage des aubes.The large number of parts of one or other of these solutions of the prior art however makes it difficult to assemble and disassemble the blades.

L'invention a pour objet une roue de rotor de turbomachine munie d'un dispositif de retenue du même genre que ceux précédemment décrits, mais ne comportant qu'un nombre de pièces moins élevé et surtout formant un ensemble susceptible d'être mis en place ou retiré en une seule opération.The subject of the invention is a turbomachine rotor wheel provided with a retaining device of the same kind as those previously described, but comprising only a lower number of parts and above all forming an assembly capable of being put in place. or removed in one operation.

Le dispositif de l'invention est remarquable en ce que la cale est formée de l'ensemble constitué par:

  • - une pièce allongée présentant une fente longitudinale s'étendant sur la presque totalité de sa longueur, les côtés longitudinaux de la pièce comportant des orifices coaxiaux ;
  • - un axe passant dans lesdits orifices ;
  • - une lame souple, maintenue par ledit axe, logée dans la fente et présentant par rapport à l'axe deux branches dont les faces supérieures entre elles et les faces inférieures entre elles font un angle obtu, l'extrémité libre d'une branche s'appuyant, par l'intermédiaire d'une portée, sur le fond d'une rainure prévue à l'une des extrémités de la pièce allongée, l'extrémité de l'autre branche présentant une partie en forme de dièdre rectangle s'appuyant sur le bord amont formé par le fond de la rainure et la face amont du disque, ladite lame souple comportant en outre, au voisinage de l'aplomb de l'orifice de l'axe, et vers l'extérieur, une portée en appui sous le pied d'aube.
The device of the invention is remarkable in that the wedge is formed of the assembly constituted by:
  • - An elongated part having a longitudinal slot extending over almost its entire length, the longitudinal sides of the part comprising coaxial orifices;
  • - an axis passing through said orifices;
  • - A flexible blade, held by said axis, housed in the slot and having with respect to the axis two branches whose upper faces between them and the lower faces between them make an obtuse angle, the free end of a branch s '' pressing, via a bearing, on the bottom of a groove provided at one end of the elongated part, the end of the other branch having a part in the form of a right-angled dihedral resting on the upstream edge formed by the bottom of the groove and the upstream face of the disc, said flexible blade further comprising, in the vicinity of the plumb of the orifice of the axis, and towards the outside, a bearing surface under the foot of dawn.

Les explications et figures données ci-après à titre d'exemple permettront de comprendre comment l'invention peut être réalisée.The explanations and figures given below by way of example will make it possible to understand how the invention can be implemented.

La figure 1 montre une vue éclatée d'un dispositif de retenue d'une aube de rotor.FIG. 1 shows an exploded view of a device for retaining a rotor blade.

La figure 2 est une vue éclatée d'une cale selon l'invention.Figure 2 is an exploded view of a wedge according to the invention.

La figure 3 est une vue en coupe longitudinale d'un élément formant la cale.Figure 3 is a longitudinal sectional view of an element forming the wedge.

La figure 4 est une vue en coupe par le plan radial passant au milieu de la rainure du dispositif de retenue selon l'invention.Figure 4 is a sectional view through the radial plane passing through the middle of the groove of the retaining device according to the invention.

La figure 1 représente en vue éclatée un dispositif de retenue axiale et radiale d'une aube de rotor. Le disque de rotor 1 présente dans sa jante des rainures axiales 2 ayant une section en queue d'aronde. A la périphérie du disque et perpendiculairement à sa face amont, des dents 3 prévues entre les rainures portent des gorges 4 se faisant face, dont le fond est parallèle au plan radial passant par le milieu de la rainure. L'aube 5, dont le pied 6 a une forme en queue d'aronde correspondant à celle de la rainure, comporte vers l'amont un prolongement en forme de talon 7, portant latéralement des gorges 8. Le montage de l'aube s'effectue en glissant le pied 6 dans la rainure 2 du disque de rotor. Lorsque l'extrémité 9 du pied 6 affleure du talon 7 d'aube se trouvent en face des gorges 4 des dents voisines 3. Un verrou en U 11, d'épaisseur égale à la distance séparant les bords latéraux des gorges 4 des dents, porte une découpe 12 dont la partie supérieure, proche de la branche horizontale du U, présente une fente. La section droite de cette fente correspondant à la partie du talon 7 comprise entre les gorges 8. La partie centrale de la découpe a une section droite correspondant à la section droite de la cale 13.Figure 1 shows an exploded view of an axial and radial retaining device of a rotor blade. The rotor disc 1 has in its rim axial grooves 2 having a dovetail section. At the periphery of the disc and perpendicular to its upstream face, teeth 3 provided between the grooves bear grooves 4 facing each other, the bottom of which is parallel to the radial plane passing through the middle of the groove. The blade 5, the foot 6 of which has a dovetail shape corresponding to that of the groove, comprises upstream a heel-shaped extension 7, carrying grooves laterally 8. The mounting of the blade s 'performs by sliding the foot 6 in the groove 2 of the rotor disc. When the end 9 of the foot 6 is flush with the heel 7 of the blade are located opposite the grooves 4 of the neighboring teeth 3. A U-shaped lock 11, of thickness equal to the distance separating the lateral edges of the grooves 4 of the teeth, carries a cutout 12 whose upper part, close to the horizontal branch of the U, has a slot. The cross section of this slot corresponding to the part of the heel 7 between the grooves 8. The central part of the cut has a cross section corresponding to the cross section of the wedge 13.

Le montage s'effectue de la façon suivante : après avoir glissé le pied d'aube 6 dans la rainure 2, on introduit le verrou 11 entre les gorges 4 et 8 des dents et du pied d'aube. Le verrou est alors en butée contre le talon 7. On introduit alors la cale 13 dans la partie centrale de la découpe 12 et entre le pied d'aube 6 et le fond 14 de la rainure 2. La cale applique la partie en queue d'aronde du pied d'aube contre les parties correspondantes de l'alvéole constituant la rainure 2 du disque 1.The assembly is carried out as follows: after having slid the blade root 6 into the groove 2, the lock 11 is introduced between the grooves 4 and 8 of the teeth and of the blade root. The lock is then in abutment against the heel 7. The shim 13 is then introduced into the central part of the cutout 12 and between the blade root 6 and the bottom 14 of the groove 2. The shim applies the tail part d dovetail of the blade root against the corresponding parts of the cell constituting the groove 2 of the disc 1.

Selon un exemple de réalisation de l'invention, la cale 13 (figure 2) est constituée de trois éléments assemblés : une pièce allongée 15, une lame souple 16 et un axe 17, dont le mode de coopération sera décrit par la suite. La pièce allongée 15 porte, dans son plan de symétrie longitudinal, une fente 18 s'étendant sur la presque totalité de sa longueur. Deux ponts 190 et 200 sont ménagés aux extrémités avant 19 et arrière 20 de la pièce. Le pont 200 ménagé à l'extrémité arrière, porte une rainure 21 dont le fond présente une partie, approximativement parallèle au plan inférieur de la pièce qui peut être raccordée à une autre partie 22, inclinée vers l'intérieur de la fente et rejoignant le plan inférieur.According to an exemplary embodiment of the invention, the wedge 13 (FIG. 2) consists of three assembled elements: an elongated part 15, a flexible blade 16 and an axis 17, the mode of cooperation of which will be described later. The elongated part 15 carries, in its longitudinal plane of symmetry, a slot 18 extending over almost its entire length. Two bridges 190 and 200 are provided at the front 19 and rear 20 ends of the part. The bridge 200 formed at the rear end carries a groove 21 the bottom of which has a part, approximately parallel to the lower plane of the part which can be connected to another part 22, inclined towards the inside of the slot and joining the lower shot.

La pièce présente à l'extrémité avant 19 une section droite de hauteur inférieure à celle de l'extrémité arrière 20.The part has at the front end 19 a cross section of height less than that of the rear end 20.

Les côtés longitudinaux 181 et 182 de la pièce 15 sont percés de deux orifices 23 coaxiaux d'axe perpendiculaire au plan de symétrie longitudinale de la pièce. La lame souple 16 a une épaisseur inférieure à celle de la fente 18 et une longueur approximativement égale à celle de la fente et est percée perpendiculairement à son plan de symétrie longitudinal d'un orifice 24. La lame est formée de part et d'autre de cet orifice par deux branches 25 et 26 dont les côtés supérieurs et inférieurs sont désignés respectivement par les repères 251, 261, 252, 262 font respectivement entre eux des angles obtus. La branche 25 porte à son extrémité libre amont 27 une découpe 28 en forme de dièdre rectangle dont les plans sont raccordés par un arrondi 28' et l'extrémité de la branche 26 présente une portée plane 29. La fonction de ces découpe et portée sera ultérieurement précisée.The longitudinal sides 181 and 182 of the part 15 are pierced by two coaxial orifices 23 with an axis perpendicular to the plane of longitudinal symmetry of the part. The flexible blade 16 has a thickness less than that of the slot 18 and a length approximately equal to that of the slot and is pierced perpendicular to its longitudinal plane of symmetry with an orifice 24. The blade is formed on either side of this orifice by two branches 25 and 26 whose upper and lower sides are designated respectively by the references 251, 261, 252, 262 respectively form obtuse angles. The branch 25 carries at its upstream free end 27 a cutout 28 in the form of a right-angled dihedral whose planes are connected by a rounded 28 ′ and the end of the branch 26 has a flat bearing 29. The function of these cutting and bearing will later specified.

La cale 13 est formée en introduisant la lame souple 16 dans la fente 18 de la pièce 15, la portée 29 de la branche 26 reposant sur le fond horizontal de la rainure 21, puis en les reliant par l'intermédiaire de l'axe 17 passant dans les orifices 23 de la cale et 24 de la lame. De ce fait les trois pièces 15, 16, 17 forment la cale 13 proprement dite. Il est à noter que l'angle que font entre elles les branches de la lame, amène l'extrémité 27 à dépasser du plan inférieur de la cale lorsque la partie 29 repose sur le fond de la rainure 21.The wedge 13 is formed by introducing the flexible blade 16 into the slot 18 of the part 15, the bearing 29 of the branch 26 resting on the horizontal bottom of the groove 21, then by connecting them via the axis 17 passing through the orifices 23 of the wedge and 24 of the blade. Therefore the three parts 15, 16, 17 form the shim 13 itself. It should be noted that the angle which the branches of the blade make between them, causes the end 27 to protrude from the lower plane of the wedge when the part 29 rests on the bottom of the groove 21.

Du fait de la saillie de l'extrémité 27, il est nécessaire, pour introduire la cale 13 entre le pied d'aube 6 et le fond 14 de la rainure 2 de contrain- dre cette extrémité de manière qu'elle se loge dans la fente. L'extrémité de la lame est maintenue dans cette position par un outil comportant des moyens prenant appui sur la face supérieure 190 de l'extrémité 19 de la pièce 15 et s'engageant dans une encoche 30 pratiquée dans la face inférieure de l'extrémité avant 27 de la lame souple 16. La pression exercée simultanément sur l'extrémité de la lame souple 16 et l'extrémité de la pièce 15 permet d'escamoter partiellement à l'intérieur de la fente 18 l'extrémité avant de la lame souple 16.Due to the projection of the end 27, it is necessary, to introduce the shim 13 between the blade root 6 and the bottom 14 of the groove 2, to constrain this end so that it fits in the slot. The end of the blade is held in this position by a tool comprising means bearing on the upper face 190 of the end 19 of the part 15 and engaging in a notch 30 formed in the lower face of the end front 27 of the flexible blade 16. The pressure exerted simultaneously on the end of the flexible blade 16 and the end of the part 15 makes it possible to partially retract inside the slot 18 the front end of the flexible blade 16.

Pour limiter le débattement de la lame souple 16, lorsque l'on maintient pressée la pièce 15 et la lame 16 par un outil de serrage, on peut prévoir de prolonger légèrement vers l'aval par un plan incliné, indiqué en pointillés en 180 sur la figure 4, la paroi amont de la fente 18. En effet, un débattement excessif vers l'extérieur de la face 251 peut donner à la cale 13 une épaisseur trop grande pour permettre son introduction dans la rainure du disque.To limit the travel of the flexible blade 16, when the part 15 and the blade 16 are kept pressed by a clamping tool, provision may be made to extend slightly downstream by an inclined plane, indicated by dotted lines in 180 on FIG. 4, the upstream wall of the slot 18. In fact, an excessive deflection towards the outside of the face 251 can give the shim 13 a thickness too great to allow its introduction into the groove of the disc.

Lorsque la lame souple est ainsi bandée, on introduit, comme précédemment décrit, la cale 13 dans la découpe centrale 12 du verrou 11 entre le pied d'aube 6 et le fond 14 de la rainure du disque. La découpe 28 de l'extrémité de la lame souple vient alors, au travers de la rainure 2, coiffer la face amont du disque de rotor.When the flexible blade is thus bandaged, the shim 13 is introduced, as previously described, into the central cutout 12 of the latch 11 between the blade root 6 and the bottom 14 of the groove of the disc. The cutout 28 of the end of the flexible blade then comes, through the groove 2, to cover the upstream face of the rotor disc.

On démonte ensuite l'outil maintenant la contrainte exercée entre la pièce 15 et la lame 16, ce qui place la face horizontale du dièdre 28 en appui sur le fond 14 de la rainure 2 et la face verticale du dièdre 28 en appui sur la face amont du disque 1. Comme illustré sur la figure 4, la cale 13 est ainsi verrouillée dans le sens axial de l'amont vers l'aval. Le verrouillage dans le sens inverse, de l'aval vers l'amont, peut être assuré de manière connue par une bride du capot avant venant s'appuyer contre l'extrémité 19 de la cale.The tool is then dismantled maintaining the stress exerted between the part 15 and the blade 16, which places the horizontal face of the dihedron 28 in abutment on the bottom 14 of the groove 2 and the vertical face of the dihedron 28 in abutment on the face upstream of the disc 1. As illustrated in FIG. 4, the shim 13 is thus locked in the axial direction of upstream downstream. Locking in the opposite direction, from downstream to upstream, can be ensured in a known manner by a flange of the front cover coming to bear against the end 19 of the wedge.

La lame, en se détendant, vient exercer une pression contre le pied d'aube 6 par l'intermédiaire d'une portée 31 prévue sur la lame à l'aplomb de l'axe de rotation et sur le fond 14 de la rainure 2 en queue d'aronde par les deux portées constituées :

  • par la face horizontale du dièdre 28, vers l'avant, sur le fond 14 de la rainure 2 du disque,
  • et par l'appui de la portée 29 sur la partie 21 de l'extrémité arrière de la pièce allongée 15, cette extrémité arrière étant elle-même en appui sur le fond 14 de la rainure 2, vers l'arrière du disque 1.
The blade, by relaxing, exerts a pressure against the blade root 6 via a bearing 31 provided on the blade perpendicular to the axis of rotation and on the bottom 14 of the groove 2 dovetailed by the two spans made up:
  • by the horizontal face of the dihedral 28, towards the front, on the bottom 14 of the groove 2 of the disc,
  • and by the support of the bearing surface 29 on the part 21 of the rear end of the elongated part 15, this rear end itself being in abutment on the bottom 14 of the groove 2, towards the rear of the disc 1.

L'élasticité de la lame 16 met en appui (directement en amont, indirectement par l'intermédiaire du pont 200 vers l'arrière) la cale 13 sur le fond de la rainure. Le milieu supérieur de la lame 16 entre en appui par une portée 31 sur la partie inférieure médiane du pied d'aube, ce qui évite le cliquetis.The elasticity of the blade 16 supports (directly upstream, indirectly via the bridge 200 towards the rear) the wedge 13 on the bottom of the groove. The upper middle of the blade 16 comes into abutment by a bearing 31 on the lower middle part of the blade root, which avoids rattling.

Selon un exemple de réalisation, la force exercée alors est de l'ordre de 200 daN, suffisante pour empêcher l'aube de cliqueter lorsque le rotor tourne en autorotation.According to an exemplary embodiment, the force then exerted is of the order of 200 daN, sufficient to prevent the blade from clicking when the rotor turns in autorotation.

Claims (4)

1. Rotor wheel of a turbo machine provided with a device for the axial and radial retention of blades on the disc, each blade comprising a dovetail root housed in a corresponding groove of the rim of the disc, the latter comprising, on its periphery and perpendicularly to its face, teeth in the edges of which substantially radial grooves are provided, facing one another and corresponding with similar grooves provided in the heel of the blade, a U-shaped locking member co-operating by means of its external part with the grooves of the teeth and having in its central part a cut-out portion corresponding to the cross-section of a key (13) housed between the blade root and the bottom of the dovetail groove, said cut-out being extended towards the horizontal portion of the U by a slit the edges of which co-operate with the grooves of the blade root, characterised in that the key (13) is formed from the assembly comprising :
- an elongate member (15) having a longitudinal slot (18) extending over almost its entire length, the longitudinal sides (181, 182) of the member (15) having co-axial openings (23) ;
- a pin (17) extending through said openings (23) ;
- a flexible blade (16) retained by the pin (17), housed in the slot and having, in relation to the pin, two branches (25, 26), the upper faces of which (251, 261) and the lower faces of which (252, 262) define an abtuse angle, the free end of one branch (26) being applied through a seating (29), on the base of a groove (21) provided at one of the ends (20) of the elongate member, the end (27) of the other branch (25) having a part (28) in the shape of a rectangular dihedron supported on the upstream side formed by the base of the groove and the upstream face of the disc, said flexible blade (16) having in addition, in the vicinity of the axis of the opening (24) of the pin (17), and towards the outside, a seating (31) supported beneath the root of the blade (6).
2. Rotor wheel according to claim 1, characterised in that the flexible blade (16) comprises on the lower face of its forward end (27) a notch (30) for the engagement of a tool seating on the upper face (190) of the forward end (19) of the elongate member (15) to retract the forward end of the blade (16) partly inside the slot (18) when the key (13) is introduced between the blade root (6) and the base (14) of the groove (2).
EP82402387A 1981-12-29 1982-12-28 Rotor wheel of a turbo jet engine comprising a device for axially and radially retaining the rotor blades on the rotor wheel Expired EP0083289B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8124355 1981-12-29
FR8124355A FR2519072B1 (en) 1981-12-29 1981-12-29 DEVICE FOR AXIAL AND RADIAL RETENTION OF A TURBO JET ROTOR BLADE

Publications (2)

Publication Number Publication Date
EP0083289A1 EP0083289A1 (en) 1983-07-06
EP0083289B1 true EP0083289B1 (en) 1985-10-30

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EP82402387A Expired EP0083289B1 (en) 1981-12-29 1982-12-28 Rotor wheel of a turbo jet engine comprising a device for axially and radially retaining the rotor blades on the rotor wheel

Country Status (5)

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US (1) US4474535A (en)
EP (1) EP0083289B1 (en)
JP (1) JPS58119904A (en)
DE (1) DE3267199D1 (en)
FR (1) FR2519072B1 (en)

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Also Published As

Publication number Publication date
JPH0131002B2 (en) 1989-06-22
US4474535A (en) 1984-10-02
DE3267199D1 (en) 1985-12-05
EP0083289A1 (en) 1983-07-06
JPS58119904A (en) 1983-07-16
FR2519072B1 (en) 1986-05-30
FR2519072A1 (en) 1983-07-01

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