EP0146449A1 - Arrangement for centering an inner stator shroud supported by changeable blades - Google Patents

Arrangement for centering an inner stator shroud supported by changeable blades Download PDF

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Publication number
EP0146449A1
EP0146449A1 EP84402381A EP84402381A EP0146449A1 EP 0146449 A1 EP0146449 A1 EP 0146449A1 EP 84402381 A EP84402381 A EP 84402381A EP 84402381 A EP84402381 A EP 84402381A EP 0146449 A1 EP0146449 A1 EP 0146449A1
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EP
European Patent Office
Prior art keywords
ring
sockets
fins
pivot
sectors
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
EP84402381A
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German (de)
French (fr)
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EP0146449B1 (en
Inventor
Jacky Naudet
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
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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 EP0146449A1 publication Critical patent/EP0146449A1/en
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Publication of EP0146449B1 publication Critical patent/EP0146449B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/52—Casings; Connections of working fluid for axial pumps
    • F04D29/54—Fluid-guiding means, e.g. diffusers
    • F04D29/56—Fluid-guiding means, e.g. diffusers adjustable
    • F04D29/563—Fluid-guiding means, e.g. diffusers adjustable specially adapted for elastic fluid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
    • F01D11/001—Preventing or minimising internal leakage of working-fluid, e.g. between stages for sealing space between stator blade and rotor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D17/00—Regulating or controlling by varying flow
    • F01D17/10—Final actuators
    • F01D17/12—Final actuators arranged in stator parts
    • F01D17/14—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits
    • F01D17/16—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of nozzle vanes
    • F01D17/162—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of nozzle vanes for axial flow, i.e. the vanes turning around axes which are essentially perpendicular to the rotor centre line
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2230/00—Manufacture
    • F05D2230/60—Assembly methods
    • F05D2230/64—Assembly methods using positioning or alignment devices for aligning or centring, e.g. pins
    • F05D2230/644—Assembly methods using positioning or alignment devices for aligning or centring, e.g. pins for adjusting the position or the alignment, e.g. wedges or eccenters

Definitions

  • the invention relates to stators with blades with variable setting of compressors.
  • the stators of this type consist of fins mounted with possibilities of rotation about their longitudinal axis in the compressor casing, their pitch angle relative to the axis of the motor being controlled by a mechanism external to the casing constituted for example by 'a synchronism ring whose movement is transmitted to the head pivots of the fins by means of rods.
  • these fins are generally connected together by an inner ring divided into a plurality of sectors, the upper face of which defines the internal wall of the vein and which support sealing means such as that a seal cooperating with the wipers of a labyrinth seal integral with the rotor in order to limit the internal leakage rates between the downstream and the upstream of the stator stage.
  • the invention relates in particular to the foot connection point of the internal fin-ring.
  • This connection is made by means of a pivot of feet movable in a bearing bush housed in a radial bore of the ring; in order to preserve the free expansion of the ring in operation, it has a certain freedom of sliding along the pivots of the fin feet.
  • the quality of the games between wipers and abradable is determining for the output and the performance of the machine.
  • the radial positioning and the rigidity of the ring are ensured by the radiating arrangement of the fins.
  • the clearances are thus determined with precision.
  • the fins can show, during assembly, a slope in a plane transverse to the axis of the engine, more or less marked; moreover, the play between pivot and bushing is not zero; this leads to a certain dispersion of the radial position of each sector which is not compensated for when these sectors are joined by the seal-wear and wear carrier rails since the rigidity of the assembly is insufficient.
  • the ring may have circularity and centering defects with respect to the rotor.
  • the extreme positions of the ring sectors are difficult to estimate; in the absence of a stop, in particular between the platform of the fins and the ring sectors, the lower corners of the fins can come into contact with the wall of the ring with the consequence of possible deterioration of the fins when they are controlled for travel around of their axis by the control system.
  • a first improvement consisted in reducing the number of sectors constituting the ring and the rail in order to limit the effects thereof due to the fractionation and in introducing at the head of each fin under the control lever a shim limiting the radial position of the 'fin, the thickness of this wedge being determined according to the residual clearance of the attachment point. Finally, by having a spacer acting as a stop between the foot pivot and the rail, it is possible to limit the variations in the radial position of the sectors.
  • US Pat. No. 3,079,128 is known in which the pivot of the feet ends in a thread, so as to radially block the ring sector between a nut tightened on the pivot and the platform of the fin.
  • Such an embodiment has the disadvantage of not lending itself to % adjustment in position of the ring sector requiring the resumption in place, by machining, of the seal and wear; moreover, the ring does not have any freedom of sliding making it possible to absorb the differential expansions in operation.
  • Patent GB 749 577 describes an inner ring assembly of the stator with the possibility of adjustment; the fins are fixed to the ring by means of a bolt mounted eccentrically in an axial bore of the feet of the fin via a sleeve with eccentric internal and external axes. It is therefore possible, by this means, to adjust the position of the ring relative to the fins and to the rotor; unfortunately, such a system cannot be applied to a stator whose fins are of variable setting.
  • adjustment means are distributed over each ring sector making it possible to position them radially.
  • These means are constituted by pivot bushings provided with an external thread cooperating with a complementary tapping of their housing in the ring sector, so that the bushings being in abutment against the lower edge of the platform of the fins, a displacement radial sector is obtained by rotation of the sockets in their housing.
  • a locking means is provided to avoid any untimely rotation once the adjustment has been made.
  • this locking means is constituted by a radial and circumferential flange secured to the outer face of the seal and wear seal carrier rail, abutting against one of the faces of the prismatic base from the socket.
  • FIG. 1 there is shown in axial section a portion of the compressor of a gas turbine engine.
  • a stator stage separates two stages of movable vanes 3 mounted on a drum-shaped rotor.
  • the stator is formed of a ring of fins 2 extending radially from the casing 1 on which they are mounted to rotate about their longitudinal axis by means of a head pivot 4 rotating in a bearing of the casing 1, with the interposition of a socket 22.
  • This pivot 4 is connected to a timing control mechanism, not shown.
  • the fins are provided with a pivot of feet 5 movable in a socket 6 fixed in a radial bore of the ring sector 7.
  • the edges of the rail 8 are curved in the form of hooks and engage with two lateral flanges of the ring.
  • This rail 8 serves as a support for a material forming a seal and wear seal 9 which cooperates in known manner, with the wipers 10 of the labyrinth seal integral with the rotor, to limit leaks due to the difference in pressures prevailing on the part and on the other side of the stator stage.
  • the radial position of the sectored ring 7 cannot be determined precisely because of the manufacturing and mounting tolerances; in operation, the ring sectors can slide along the pivots modifying the clearance between the seal and wear and labyrinth seal on the one hand, the clearance between the inner edges of the fins and the wall of the vein on the other hand; when the latter clearance becomes zero, the operation of the timing control of the fins is impeded, causing the latter to deteriorate.
  • the pivot 5 of the fin 2 pivots in a bush 12 made of a self-lubricating material such as graphite; this bushing is itself supported by a second bushing 14 provided with an external thread cooperating with a complementary tapping of its housing in the ring sector 7.
  • Panes 15 are cut at the widened base of the bushing 14 which has in this way a cross section of polygonal shape for example hexagonal ( Figure 4) and which opens into a groove 16, peripheral, of the inner face of the ring (7).
  • This groove provides around the base of the sleeve a space allowing on the one hand, the use of a tool on the other hand, sufficient relative displacement of the sleeve in the sector; in particular, the bush must be able to come to bear against the internal shoulder of the platform 21.
  • This platform is engaged in a recess extending the tapped part of the housing of the bush 14.
  • the rail 8 has a radial flange 81, peripheral, on its upper face which is received in the groove 16 of the ring and against which one of the sections of the base of the socket abuts.
  • the ring is thus reconstituted step by step and the sectors joined to each other by fitting segments of the seal and wear-bearing rail 8.

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

Abstract

Afin de permettre le réglage en position de l'anneau intérieur d'un stator à ailettes à calage variable d'une turbo-machine, chacun des secteurs (7) de cet anneau est pourvu de points de réglage constitués de douilles (14) de paliers de pivot de pieds des ailettes (2) qui comportent un filetage externe coopérant avec un taraudage complémentaire de leur logement et viennent en appui contre un épaulement des pivots (5) de sorte que la position radiale de chacun des secteurs (7) peut être ajustée par rotation des douilles dans leur logement.In order to allow the adjustment in position of the inner ring of a stator with variable-pitched fins of a turbo-machine, each of the sectors (7) of this ring is provided with adjustment points constituted by sockets (14) of pivot bearings of the feet of the fins (2) which have an external thread cooperating with a complementary tapping of their housing and come to bear against a shoulder of the pivots (5) so that the radial position of each of the sectors (7) can be adjusted by rotation of the sockets in their housing.

Description

L'invention se rapporte aux stators à ailettes à calage variable de compresseurs.The invention relates to stators with blades with variable setting of compressors.

Les stators de ce type sont constitués d'ailettes montées avec possibilités de rotation autour de leur axe longitudinal dans le carter du compresseur, leur angle de calage par rapport à l'axe du moteur étant commandé par un mécanisme extérieur au carter constitué par exemple d'un anneau de synchronisme dont le mouvement est transmis au pivots de tête des ailettes par l'intermédiaire de biellettes.The stators of this type consist of fins mounted with possibilities of rotation about their longitudinal axis in the compressor casing, their pitch angle relative to the axis of the motor being controlled by a mechanism external to the casing constituted for example by 'a synchronism ring whose movement is transmitted to the head pivots of the fins by means of rods.

A leur extrémité inférieure, près de l'axe du moteur, ces ailettes sont généralement reliées entre elles par un anneau intérieur divisé en une pluralité de secteurs dont la face supérieure définit la paroi interne de la veine et qui supportent des moyens d'étanchéité tel qu'une garniture d'étanchéité coopérant avec les léchettes d'un joint labyrinthe solidaire du rotor afin de limiter les débits de fuite interne entre l'aval et l'amont de l'étage statorique.At their lower end, near the axis of the engine, these fins are generally connected together by an inner ring divided into a plurality of sectors, the upper face of which defines the internal wall of the vein and which support sealing means such as that a seal cooperating with the wipers of a labyrinth seal integral with the rotor in order to limit the internal leakage rates between the downstream and the upstream of the stator stage.

L'invention concerne en particulier le point de liaison pieds de l'ailette-anneau interne. Cette liaison est réalisée au moyen d'un pivot de pieds mobile dans une douille de palier logée dans un alésage radial de l'anneau ; afin de conserver la libre dilatation de l'anneau en fonctionnement, celui-ci possède une certaine liberté de coulissement le long des pivots de pieds d'ailette.The invention relates in particular to the foot connection point of the internal fin-ring. This connection is made by means of a pivot of feet movable in a bearing bush housed in a radial bore of the ring; in order to preserve the free expansion of the ring in operation, it has a certain freedom of sliding along the pivots of the fin feet.

La qualité des jeux entre léchettes et abradable est déterminante pour le rendement et la performance de la machine. Dans l'hypothèse de tolérances de réalisation à 100 %, le positionnement radial et la rigidité de l'anneau sont assurés par la disposition rayonnante des ailettes. Les jeux sont ainsi déterminés avec précision. En réalité, les ailettes peuvent accuser, au montage, un devers dans un plan transversal à l'axe du moteur, plus ou moins marqué ; de plus, le jeu entre pivot et douille n'est pas nul ; ceci conduit à une certaine dispersion de la position radiale de chaque secteur qui n'est pas compensée lorsque ces secteurs sont réunis par les rails porte-garniture d'étanchéité et d'usure car la rigidité de l'ensemble est insuffisante. Ainsi, l'anneau peut présenter des défauts de circularité et, de centrage par rapport au rotor. En outre, en fonctionnement les positions extrêmes des secteurs d'anneaux sont difficiles à estimer ; en l'absence de butée notamment entre la plateforme des ailettes et les secteurs d'anneau, les coins inférieurs des ailettes peuvent venir en contact avec la paroi de l'anneau avec comme conséquence une détérioration possible des ailettes lors de leur commande de débattement autour de leur axe par le système de commande.The quality of the games between wipers and abradable is determining for the output and the performance of the machine. In the hypothesis of 100% production tolerances, the radial positioning and the rigidity of the ring are ensured by the radiating arrangement of the fins. The clearances are thus determined with precision. In reality, the fins can show, during assembly, a slope in a plane transverse to the axis of the engine, more or less marked; moreover, the play between pivot and bushing is not zero; this leads to a certain dispersion of the radial position of each sector which is not compensated for when these sectors are joined by the seal-wear and wear carrier rails since the rigidity of the assembly is insufficient. Thus, the ring may have circularity and centering defects with respect to the rotor. In addition, in operation the extreme positions of the ring sectors are difficult to estimate; in the absence of a stop, in particular between the platform of the fins and the ring sectors, the lower corners of the fins can come into contact with the wall of the ring with the consequence of possible deterioration of the fins when they are controlled for travel around of their axis by the control system.

Une première amélioration.a consisté à réduire le nombre des secteurs constituant l'anneau et le rail afin d'en limiter les effets dûs au fractionnement et à introduire en tête de chaque ailette sous le levier de commande une cale limitant la position radiale de l'ailette, l'épaisseur de cette cale étant déterminée en fontion du jeu résiduel du point d'attache. Enfin, en disposant une entretoise faisant office de butée entre le pivot de pied et le rail, on peut limiter les variations de position radiale des secteurs.A first improvement consisted in reducing the number of sectors constituting the ring and the rail in order to limit the effects thereof due to the fractionation and in introducing at the head of each fin under the control lever a shim limiting the radial position of the 'fin, the thickness of this wedge being determined according to the residual clearance of the attachment point. Finally, by having a spacer acting as a stop between the foot pivot and the rail, it is possible to limit the variations in the radial position of the sectors.

Cependant, outre les difficultés à réaliser par cette méthode un centrage satisfaisant de l'anneau par rapport au rotor sa mise en oeuvre complique les opérations de maintenance en raison du risque d'inversion des cales ou des entretoises au cours d'un remontage.However, in addition to the difficulties in achieving by this method a satisfactory centering of the ring relative to the rotor, its implementation complicates the maintenance operations due to the risk of inversion of the wedges or spacers during reassembly.

On connaît par ailleurs le brevet US 3 079 128 où le pivot de pieds se termine par un filetage, de façon à bloquer radialement le secteur d'anneau entre un écrou serré sur le pivot et la plateforme de l'ailette. Une telle réalisation présente l'inconvénient de ne pas se prêter à%un réglage en position du secteur d'anneau nécessitant la reprise en place, par usinage, de la garniture d'étanchéité et d'usure ; de plus, l'anneau ne possède aucune liberté de glissement permettant d'absorber les dilatations différentielles en fonctionnement.Furthermore, US Pat. No. 3,079,128 is known in which the pivot of the feet ends in a thread, so as to radially block the ring sector between a nut tightened on the pivot and the platform of the fin. Such an embodiment has the disadvantage of not lending itself to % adjustment in position of the ring sector requiring the resumption in place, by machining, of the seal and wear; moreover, the ring does not have any freedom of sliding making it possible to absorb the differential expansions in operation.

Le brevet GB 749 577 décrit un montage d'anneau intérieur du stator avec possibilité de réglage ; les ailettes sont fixées à l'anneau au moyen d'un boulon monté excentré dans un alésage axial des pieds de l'ailette par l'intermédiaire d'un manchon à axes interne et externe excentrés. On peut donc, par ce moyen, effectuer un réglage de la position de l'anneau par rapport aux ailettes et au rotor ; malheureusement, un tel système ne peut s'appliquer à un stator dont les ailettes sont à calage variable.Patent GB 749 577 describes an inner ring assembly of the stator with the possibility of adjustment; the fins are fixed to the ring by means of a bolt mounted eccentrically in an axial bore of the feet of the fin via a sleeve with eccentric internal and external axes. It is therefore possible, by this means, to adjust the position of the ring relative to the fins and to the rotor; unfortunately, such a system cannot be applied to a stator whose fins are of variable setting.

L'invention se propose donc de réaliser les objectifs recherchés, c'est-à-dire :

  • - limiter les variations de position radiale de l'anneau,
  • - éliminer les risques de contact entre coins inférieurs des ailettes et anneau interne,
  • - faciliter le réglage en position de l'anneau.
The invention therefore proposes to achieve the desired objectives, that is to say:
  • - limit variations in the radial position of the ring,
  • - eliminate the risk of contact between the lower corners of the fins and the inner ring,
  • - facilitate the adjustment in position of the ring.

Conformément à l'invention, des moyens de réglage sont répartis sur chaque secteur d'anneau permettant de les positionner radialement. Ces moyens sont constitués par des douilles de pivot pourvues d'un filetage extérieur coopérant avec un taraudage complémentaire de leur logement dans le secteur d'anneau, de sorte que les douilles étant en appui contre le bord inférieur de la plateforme des ailettes, un déplacement radial du secteur est obtenu par rotation des douilles dans leur logement. Un moyen .de verrouillage est prévu pour éviter toute rotation inopportune une fois le réglage effectué.According to the invention, adjustment means are distributed over each ring sector making it possible to position them radially. These means are constituted by pivot bushings provided with an external thread cooperating with a complementary tapping of their housing in the ring sector, so that the bushings being in abutment against the lower edge of the platform of the fins, a displacement radial sector is obtained by rotation of the sockets in their housing. A locking means is provided to avoid any untimely rotation once the adjustment has been made.

Selon une caractéristique supplémentaire de l'invention, ce moyen de verrouillage est constitué par une bride radiale et circonférentielle solidaire de la face extérieure du rail porte-garniture d'étanchéité et d'usure, venant en butée contre une des faces de la base prismatique de la douille.According to an additional characteristic of the invention, this locking means is constituted by a radial and circumferential flange secured to the outer face of the seal and wear seal carrier rail, abutting against one of the faces of the prismatic base from the socket.

L'invention ressortira mieux de la description qui va suivre donnant un exemple non limitatif de réalisation en relation avec les dessins annexés sur lesquels :

  • - la figure 1 est une coupe axiale d'une partie de compresseur montrant une liaison pivot de pieds-anneau sans moyen de réglage,
  • - la figure 2 est une vue agrandie de la liaison pivot de pieds-anneau présentant un moyen de réglage caractéristique de l'invention,
  • - la figure 3 est une vue semblable présentant un mode de réalisation légèrement différent,
  • - la figure 4 est une vue en coupe partielle selon la ligne III de la figure 3.
The invention will emerge more clearly from the description which follows, giving a nonlimiting example of embodiment in relation to the appended drawings in which:
  • FIG. 1 is an axial section of a part of the compressor showing a pivot connection between the feet and the ring without means of adjustment,
  • FIG. 2 is an enlarged view of the pivot link of the feet-ring having an adjustment means characteristic of the invention,
  • FIG. 3 is a similar view showing a slightly different embodiment,
  • - Figure 4 is a partial sectional view along line III of Figure 3.

En se reportant à la figure 1, on voit représenté en coupe axiale une partie de compresseur d'un moteur à turbine à gaz. A l'intérieur du carter 1, un étage de stator sépare deux étages d'aubes mobiles 3 montées sur un rotor en forme de tambour. Le stator est formé d'une couronne d'ailettes 2 s'étendant radialement à partir du carter 1 sur lequel elles sont montées à rotation autour de leur axe longitudinal par l'intermédiaire d'un pivot de tête 4'tourillonnant dans un palier du carter 1, avec interposition d'une douille 22. Ce pivot 4 est relié à un mécanisme de commande de calage, non représenté. A leur autre extrémité, en se dirigeant vers l'axe du moteur, les ailettes sont pourvues d'un pivot de pieds 5 mobile dans une douille 6 fixée dans un alésage radial du secteur d'anneau 7. L'anneau définit par sa face extérieure la paroi interne de la veine du compresseur, les secteurs le constituant sont réunis par un rail 8 divisé également en segments dont le nombre est inférieur à celui des secteurs. Les bords du rail 8 sont recourbés en forme de crochets et viennent en prise avec deux brides latérales de l'anneau.Referring to Figure 1, there is shown in axial section a portion of the compressor of a gas turbine engine. Inside the casing 1, a stator stage separates two stages of movable vanes 3 mounted on a drum-shaped rotor. The stator is formed of a ring of fins 2 extending radially from the casing 1 on which they are mounted to rotate about their longitudinal axis by means of a head pivot 4 rotating in a bearing of the casing 1, with the interposition of a socket 22. This pivot 4 is connected to a timing control mechanism, not shown. At their other end, while moving towards the axis of the engine, the fins are provided with a pivot of feet 5 movable in a socket 6 fixed in a radial bore of the ring sector 7. The ring defined by its face outside the internal wall of the compressor stream, the constituent sectors are joined by a rail 8 also divided into segments, the number of which is less than that of the sectors. The edges of the rail 8 are curved in the form of hooks and engage with two lateral flanges of the ring.

Ce rail 8 sert de support à un matériau formant garniture d'étanchéité et d'usure 9 qui coopère de façon connue, avec les léchettes 10 du joint labyrinthe solidaire du rotor, pour limiter les fuites dues à la différence des pressions régnant de part et d'autre de l'étage statorique.This rail 8 serves as a support for a material forming a seal and wear seal 9 which cooperates in known manner, with the wipers 10 of the labyrinth seal integral with the rotor, to limit leaks due to the difference in pressures prevailing on the part and on the other side of the stator stage.

Comme évoqué précédemment, la position radiale de l'anneau sectorisé 7 ne peut être déterminée avec précision à cause des tolérances de fabrication et de montage ; en fonctionnement, les secteurs d'anneau peuvent coulisser le long des pivots modifiant le jeu entre garniture d'étanchéité et d'usure et joint labyrinthe d'une part, le jeu entre bords intérieurs des ailettes et la paroi de la veine d'autre part ; lorsque ce dernier jeu devient nul, le fonctionnement de la commande du calage des ailettes est contrarié entrainant la détérioration de ces dernières.As mentioned above, the radial position of the sectored ring 7 cannot be determined precisely because of the manufacturing and mounting tolerances; in operation, the ring sectors can slide along the pivots modifying the clearance between the seal and wear and labyrinth seal on the one hand, the clearance between the inner edges of the fins and the wall of the vein on the other hand; when the latter clearance becomes zero, the operation of the timing control of the fins is impeded, causing the latter to deteriorate.

Enfin le mauvais positionnement de l'anneau, déterminant pour la veine, est cause de perturbation du fontionnement aérodynamique du compresseur.Finally the bad positioning of the ring, determining for the vein, is cause of disturbance of the aerodynamic functioning of the compressor.

Conformément à l'invention, on remédie à ces défauts en ménageant un point de réglage à chaque extrémité des secteurs.According to the invention, these defects are remedied by providing an adjustment point at each end of the sectors.

En se reportant à la figure 2, on voit représenté une forme de réalisation de l'invention, les éléments restant inchangés par rapport à la figure 1 portant la même référence.Referring to Figure 2, there is shown an embodiment of the invention, the elements remaining unchanged from Figure 1 having the same reference.

Le pivot 5 de l'ailette 2 tourillonne dans une douille 12 constituée d'un matériau autolubrifiant tel que le graphite ; cette douille est elle-même supportée par une deuxième douille 14 pourvue d'un filetage extérieur coopérant avec un taraudage complémentaire de son logement dans le secteur d'anneau 7. Des pans 15 sont taillés à la base élargie de la douille 14 qui présente de cette façon une section transversale de forme polygonale par exemple hexagonale (figure 4) et qui débouche dans une rainure 16, périphérique, de la face intérieure de l'anneau (7). Cette rainure ménage autour de la base de la douille un espace permettant d'une part, l'utilisation d'un outil d'autre part, un déplacement relatif suffisant de la douille dans le secteur ; notamment la douille doit pouvoir venir s'appuyer contre l'épaulement intérieur de la plateforme 21. Cette plate- formeest engagée dans un évidement prolongeant la partie taraudée du logement de la douille 14.The pivot 5 of the fin 2 pivots in a bush 12 made of a self-lubricating material such as graphite; this bushing is itself supported by a second bushing 14 provided with an external thread cooperating with a complementary tapping of its housing in the ring sector 7. Panes 15 are cut at the widened base of the bushing 14 which has in this way a cross section of polygonal shape for example hexagonal (Figure 4) and which opens into a groove 16, peripheral, of the inner face of the ring (7). This groove provides around the base of the sleeve a space allowing on the one hand, the use of a tool on the other hand, sufficient relative displacement of the sleeve in the sector; in particular, the bush must be able to come to bear against the internal shoulder of the platform 21. This platform is engaged in a recess extending the tapped part of the housing of the bush 14.

Afin d'éviter en fonctionnement toute rotation inopportune de la douille 14 une patte-frein rapportée sur l'anneau intérieur en assure le verrouillage ; à cet effet, le rail 8 comporte une bride 81 radiale, périphérique, sur sa face supérieure qui vient se loger dans la rainure 16 de l'anneau et contre laquelle un des pans de la base de la douille vient en butée.In order to avoid inopportune rotation of the socket 14, a brake lug attached to the inner ring locks it; for this purpose, the rail 8 has a radial flange 81, peripheral, on its upper face which is received in the groove 16 of the ring and against which one of the sections of the base of the socket abuts.

Dans la figure 3, au lieu d'utiliser une douille de carbone 12 entre le pivot 5 et la douille 14, on a recouvert le pivot 5 d'un revêtement antifriction 17 tel que le Téflon par exemple.In FIG. 3, instead of using a carbon bush 12 between the pivot 5 and the bush 14, the pivot 5 has been covered with an anti-friction coating 17 such as Teflon for example.

Le montage et le réglage en position de l'anneau intérieur est réalisé de la façon suivante :

  • Après avoir disposé les ailettes dans le carter, douilles 22 démontées, les secteurs aux extrémités de chacun desquels on a prévu un point de réglage sont mis en place par introduction des pivots 5 dans leur palier ; les douilles 22 sont ensuite remontées sur les pivots de tête 4. Pour faciliter le montage, on donne aux douilles 14 une position initiale dévissée de sorte que l'on obtient une position quelconque de l'anneau. Le calage point par point est obtenu par vissage/dévissage des douilles 14, celles-ci étant en contact avec la plateforme 21 correspondante. Cette opération s'effectue en corrélation avec un contrôle de la côte au positionnement désiré. On prend soin de terminer la rotation des douilles 14 sur un pan parallèle au bord de la rainure 16 en prévision du montage de la bride 81.
The mounting and adjustment in position of the inner ring is carried out as follows:
  • After having disposed the fins in the casing, disassembled sockets 22, the sectors at the ends of each of which an adjustment point has been provided are put in place by introduction of the pivots 5 in their bearing; the sockets 22 are then reassembled on the head pivots 4. To facilitate assembly, the sockets 14 are given an initial unscrewed position so that any position of the ring is obtained. The point by point setting is obtained by screwing / unscrewing the sockets 14, the latter being in contact with the corresponding platform 21. This operation is carried out in correlation with a coast control at the desired positioning. Care is taken to complete the rotation of the sockets 14 on a panel parallel to the edge of the groove 16 in anticipation of the mounting of the flange 81.

On notera que si la base de la douille 14 est taillée en 6 pans et que le pas de filetage est de 0,5 mm, la précision de réglage par chaque sixième de tour de la douille est de 0,08 mm.It will be noted that if the base of the socket 14 is cut in a hexagonal shape and the thread pitch is 0.5 mm, the precision of adjustment by each sixth of a turn of the socket is 0.08 mm.

L'anneau est ainsi reconstitué de proche en proche et les secteurs solidarisés entre eux par mise en place des segments de rail porte-garniture d'étanchéité et d'usure 8.The ring is thus reconstituted step by step and the sectors joined to each other by fitting segments of the seal and wear-bearing rail 8.

En résumé, grâce à cette solution :

  • - on parvient à maîtriser la géométrie de l'anneau et à assurer la continuité de la paroi interne de la veine en éliminant les ressauts circonférentiels entre secteurs,
  • - il est permis d'employer des tolérances de fabrication qui normalement seraient incompatibles avec les jeux demandés,
  • - enfin, on garantit les jeux entre rotors et stators dans des écarts réduits.
In summary, thanks to this solution:
  • - we manage to control the geometry of the ring and ensure the continuity of the internal wall of the vein by eliminating the circumferential projections between sectors,
  • - it is allowed to use manufacturing tolerances which would normally be incompatible with the required clearances,
  • - Finally, the clearance between rotors and stators is guaranteed in reduced distances.

Claims (6)

1. Dispositif de centrage de l'anneau intérieur d'un stator à ailettes à calage variable dont les ailettes (2) sont montées avec possibilité de rotation autour de leur axe longitudinal dans un palier du carter de la turbomachine et comportent à leur extrémité intérieure un pivot de pieds (5) tourillonnant dans un palier dudit anneau ; cet anneau, divisé en secteurs (7) supportant des moyens d'étanchéité (9) destinés à réduire les fuites internes entre le stator et le rotor ; dispositif caractérisé en ce que des points de réglage sont répartis sur les secteurs ; en ces points les douilles (14) de palier de pivot de pieds (5) des ailettes (2) comportent un filetage externe coopérant avec un taraudage complémentaire de leur logement et viennent en appui contre un épaulement dont sont pourvus lesdits pivots (5) de sorte que la position radiale de chaque secteur (7) peut être ajustée par rotation des douilles (14) dans leur logement, un moyen de blocage étant prévu pour verrouiller ces douilles en position une fois le réglage effectué.1. Device for centering the inner ring of a stator with variable-pitched fins, the fins (2) of which are mounted with the possibility of rotation about their longitudinal axis in a bearing in the casing of the turbomachine and have at their inner end a foot pivot (5) swiveling in a bearing of said ring; this ring, divided into sectors (7) supporting sealing means (9) intended to reduce internal leaks between the stator and the rotor; device characterized in that adjustment points are distributed over the sectors; at these points the bushes (14) for the pivot pivot of the feet (5) of the fins (2) have an external thread cooperating with a tapping complementary to their housing and come to bear against a shoulder with which said pivots (5) are provided. so that the radial position of each sector (7) can be adjusted by rotation of the sockets (14) in their housing, a locking means being provided for locking these sockets in position once the adjustment has been made. 2. Dispositif selon la revendication 1, caractérisé en ce que les points de réglage sont disposés aux extrémités de chaque secteur (7).2. Device according to claim 1, characterized in that the adjustment points are arranged at the ends of each sector (7). 3. Dispositif selon l'une des revendications précédentes caractérisé en ce que les pivots (5) sont revêtus d'un matériau antifriction (17).3. Device according to one of the preceding claims, characterized in that the pivots (5) are coated with an anti-friction material (17). 4. Dispositif selon l'une des revendications 1 et 2 caractérisé en ce qu'un manchon en carbone (12) est interposé entre les pivots (5) et les douilles (14).4. Device according to one of claims 1 and 2 characterized in that a carbon sleeve (12) is interposed between the pivots (5) and the sockets (14). 5. Dispositif selon l'une des revendications précédentes caractérisé en ce que la base des douilles (14) est de section à forme polygonale ; les faces latérales (15) coopérant avec une patte-frein rapportée sur l'anneau intérieur pour le verrouillage en position des douilles.5. Device according to one of the preceding claims characterized in that the base of the sockets (14) is of polygonal section; the side faces (15) cooperating with a brake lug attached to the inner ring for locking the sockets in position. 6. Dispositif de centrage, selon la revendication 5 d'un anneau intérieur supportant un rail (8) porte-garniture d'étanchéité et d'usure (9) coopérant avec les léchettes d'un joint labyrinthe monté sur le rotor caractérisé en ce que la patte-frein est constituée par une bride (81) radiale solidaire de la face supérieure dudit rail (8).6. Centering device according to claim 5 of an inner ring supporting a rail (8) seal and wear packing holder (9) cooperating with the wipers of a labyrinth seal mounted on the rotor characterized in that the brake lug is constituted by a radial flange (81) secured to the upper face of said rail (8).
EP84402381A 1983-12-07 1984-11-22 Arrangement for centering an inner stator shroud supported by changeable blades Expired EP0146449B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8319538 1983-12-07
FR8319538A FR2556410B1 (en) 1983-12-07 1983-12-07 DEVICE FOR CENTERING THE INSIDE RING OF A VARIABLE TIMING FINS STATOR

Publications (2)

Publication Number Publication Date
EP0146449A1 true EP0146449A1 (en) 1985-06-26
EP0146449B1 EP0146449B1 (en) 1986-11-12

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EP84402381A Expired EP0146449B1 (en) 1983-12-07 1984-11-22 Arrangement for centering an inner stator shroud supported by changeable blades

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US (1) US4604030A (en)
EP (1) EP0146449B1 (en)
JP (1) JPS60145500A (en)
DE (1) DE3461318D1 (en)
FR (1) FR2556410B1 (en)

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FR2994453A1 (en) * 2012-08-08 2014-02-14 Snecma Radial inner assembly for bladed ring sector of compressor stator or turbine of e.g. turbojet engine of aircraft, has anti-rotation edge whose length is greater than maximum spacing distance between projections of casing head
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FR2603340A1 (en) * 1986-09-03 1988-03-04 Snecma TURBOMACHINE COMPRISING A DEVICE FOR ADJUSTING THE GAMES OF A LABYRINTH JOINT BETWEEN ROTOR AND STATOR AND OF THE GAS VEIN ALIGNMENT AND METHOD OF APPLICATION
EP0259221A1 (en) * 1986-09-03 1988-03-09 Societe Nationale D'etude Et De Construction De Moteurs D'aviation "Snecma" Labyrinth clearance adjustment for a turbo machine
US4773817A (en) * 1986-09-03 1988-09-27 Societe Nationale D'etude Et De Construction De Moteurs D'aviation "S.N.E.C.M.A." Labyrinth seal adjustment device for incorporation in a turbomachine
EP0298894A1 (en) * 1987-07-08 1989-01-11 United Technologies Corporation Split shroud compressor
EP0432885A1 (en) * 1989-11-16 1991-06-19 General Motors Corporation Mounting of adjustable stator vanes in an axial compressor stage
GB2289726A (en) * 1994-05-25 1995-11-29 Gen Electric Stator vane support
GB2289726B (en) * 1994-05-25 1998-02-04 Gen Electric Stator vane housing
CN101970804B (en) * 2008-03-19 2014-01-29 斯奈克玛 Sectored distributor for turbomachine
WO2009125078A2 (en) 2008-03-19 2009-10-15 Snecma Sectored distributor for turbomachine
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CN101970804A (en) * 2008-03-19 2011-02-09 斯奈克玛 Sectored distributor for turbomachine
US8602726B2 (en) 2008-03-19 2013-12-10 Snecma Sectored distributor for turbomachine
FR2928961A1 (en) * 2008-03-19 2009-09-25 Snecma Sa SECTORIZED DISPENSER FOR A TURBOMACHINE.
FR2994453A1 (en) * 2012-08-08 2014-02-14 Snecma Radial inner assembly for bladed ring sector of compressor stator or turbine of e.g. turbojet engine of aircraft, has anti-rotation edge whose length is greater than maximum spacing distance between projections of casing head
EP3176384A1 (en) * 2015-12-04 2017-06-07 MTU Aero Engines GmbH Inner shroud, corresponding inner shroud sector, vane assembly and turbomachine
US10626742B2 (en) 2015-12-04 2020-04-21 MTU Aero Engines AG Inner ring and guide vane cascade for a turbomachine
FR3083564A1 (en) * 2018-07-05 2020-01-10 Safran Aircraft Engines TURBINE COMPRISING AN ABRADABLE ELEMENT WITH AN ADJUSTABLE RADIAL POSITION
FR3085060A1 (en) * 2018-08-17 2020-02-21 Safran Aircraft Engines VARIABLE SETTING BLADE GUIDE RING AND MOUNTING METHOD THEREOF
GB2577795A (en) * 2018-08-17 2020-04-08 Safran Guiding ring for variable-pitch blades and method of mounting said rings
US11149571B2 (en) 2018-08-17 2021-10-19 Safran Aircraft Engines Guiding ring for variable-pitch blades and method of mounting said ring
GB2577795B (en) * 2018-08-17 2021-12-15 Safran Aircraft Engines Guiding ring for variable-pitch blades and method of mounting said ring
CN110656981A (en) * 2019-10-09 2020-01-07 莱芜钢铁集团有限公司 TRT stationary blade adjustable mechanism positioning method
CN110656981B (en) * 2019-10-09 2022-03-25 莱芜钢铁集团有限公司 TRT stationary blade adjustable mechanism positioning method
EP3913194A1 (en) * 2020-05-21 2021-11-24 Raytheon Technologies Corporation Variable vane assembly and method for operating a variable vane assembly
US11566535B2 (en) 2020-05-21 2023-01-31 Raytheon Technologies Corporation Low friction, wear resistant variable vane bushing
RU223040U1 (en) * 2023-10-25 2024-01-29 Акционерное общество "Объединенная двигателестроительная корпорация" (АО "ОДК") GAS TURBINE ENGINE COMPRESSOR GUIDE WITH SEAL

Also Published As

Publication number Publication date
JPS60145500A (en) 1985-07-31
DE3461318D1 (en) 1987-01-02
FR2556410A1 (en) 1985-06-14
US4604030A (en) 1986-08-05
EP0146449B1 (en) 1986-11-12
FR2556410B1 (en) 1986-09-12

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