EP0696675B1 - Assembly device for a circular row of variable guide vanes - Google Patents

Assembly device for a circular row of variable guide vanes Download PDF

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Publication number
EP0696675B1
EP0696675B1 EP95401862A EP95401862A EP0696675B1 EP 0696675 B1 EP0696675 B1 EP 0696675B1 EP 95401862 A EP95401862 A EP 95401862A EP 95401862 A EP95401862 A EP 95401862A EP 0696675 B1 EP0696675 B1 EP 0696675B1
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EP
European Patent Office
Prior art keywords
guide vanes
pivots
assembling
circular stage
ring
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP95401862A
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German (de)
French (fr)
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EP0696675A1 (en
Inventor
Jacques Robert Audet
Gérard Gabriel Miraucourt
Jean-Louis Charbonnel
Jean-Claude Prato
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 of EP0696675A1 publication Critical patent/EP0696675A1/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
    • 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
    • F05D2250/00—Geometry
    • F05D2250/10—Two-dimensional
    • F05D2250/14—Two-dimensional elliptical
    • F05D2250/141—Two-dimensional elliptical circular

Definitions

  • the invention relates to a device assembling a circular stage of pivoting vanes, often called variable pitch vanes and which found in a large number of modern turbomachines, usually on the first stages of the compressor, so to modify the gas flow characteristics according to the speeds of the machine.
  • the pivoting blades of the same stage are in general controlled by a common compound device a control ring and connecting rods hinged to the control ring and at the different blades and located around the blades, outside the stator which delimits the gas flow stream through which the blades extend; the other ends of the blades, adjacent to the rotor, are joined by an assembly annular.
  • This assembly was traditionally composed of two rings, one upstream and the other in downstream, which were brought together and assembled by bolts so as to trap the pivots between them vanes and bushings for pivoting. This solution was disadvantageous because of the number relatively large of bolts that was needed to the assembly of the rings and the additional weight which resulted.
  • US-A-4,395,195 describes a system for retaining the internal ends of blades pivoting composed of two groups of overlapping annular segments in the direction of the circumference, the internal segments joining at mid-length external segments.
  • the internal segments which are nested in the external segments are drilled and supported by individual washers associated with pivot grooves the ends of the pivoting vanes by preventing it from sliding and moving in the radial direction.
  • the annular structure can be separate from the rail or integrated into it.
  • the ring is advantageously continuous and the days are then of suitable forms so that one can mount the pivots in the ring.
  • the days are slots opening on one side of the ring or recesses comprising parts enlarged by which you can slide the intact parts, not notched by the grooves of the pivots.
  • the device constituting the invention and the adjacent parts of the machine are shown completely in Figures 1 and 2.
  • the vanes 1 with timing variable are distributed in circular stages between stages of the same shape of rotor blades 2 rigidly linked to a rotor 3.
  • the blades 1 are assigned to the flow straightening and are finished at the exterior by a control pivot 4 which passes through a stator cover 5 and ends outside of this by a hexagonal or square head 6 on which one engaged an operating key 7, to the end of a control rod 8 of which the other end slides through a pivoting shaft end 9 a control ring 10, the rotation of which around the machine axis rotates the connecting rods control 8 and the vanes 1 of the whole stage.
  • the vanes 1 are finished at their end opposite by a guide pivot 11 rotating in a bush 12 provided with circular shoulders 13 and 14 with its two ends.
  • the sleeve 12 is engaged in the holes 15 of a compound retaining ring 16, as seen in Figure 2, sectors 17 completed at their ends in the angular direction by a half of drilling. When sectors 17 are assembled, the drilling halves come together to form holes 15 complete in which the sockets 12 and the pivots 11 are trapped.
  • Sectors 17 are not not directly connected to each other, but strung in a rail 18 composed of two half-rings 19 attached between them by 20 bolts at their junctions.
  • the rail 18 has substantially a trough section forming a hollow 21. It is composed of a bottom 22 of edges of which stand two sides 23 and 24 of which each has a rim 25 or 26 which projects above from the bottom 22 and which surrounds a ledge, 27 or 28 respectively, outside sectors 17 to imprison them.
  • the sidewall 23 further comprises a internal rim 29, and the rim 27 and the flange 13 are trapped between the edges 25 and 29; and one outer edge 30 is arranged on the other side of the sectors 17 so that the rim 26 is trapped between the flanges 28 and 30 which are parallel.
  • the bottom 22 carries a layer of material 31 called abradable, i.e. easy to wear or erode, on its internal face, in front of wipers 32 in the form of circular ridge, which stand up from the rotor 3.
  • abradable i.e. easy to wear or erode
  • wipers 32 touch easy wear material 31 during the service of the machine, rub on it and wear it out by shaping it to their shape leaving subsist that a very slight game that almost opposes perfect for leaks at this point in the machine.
  • a ring 33 is housed in the recess 21 and engaged in grooves 34 pivots 11.
  • the ring 33 is continuous over its entire circumference and therefore common to all pivots 11.
  • Figure 3 shows a concrete example of realization which makes it possible to carry out the assembly: the ring 33 is provided with 35 days composed of a part wide 36, with a diameter greater than that of the pivots 11, which can therefore be engaged through the ring 33 at this place, and a narrow part 37 whose width is less than the diameter of the pivots 11 but greater than throat bottom diameter 34.
  • the narrow parts 37 and wide 36 of each day 35 are contiguous and successive on the circumference of the ring 33, a rotational movement of the ring 33 allows, after having driven the pivots 11 through the parts wide 36 so that the grooves 34, 33 arrive at height of the ring 33, to send the edges 38 of the narrow parts 37 in the grooves 34 to retain thus the vanes 1 in the radial direction of the machine.
  • Figure 4 shows that other designs are possible to ensure the same holding effect, and that especially the 35 days in form of recesses in the center of the ring 33 can be replaced by slots 39 whose width is identical to that of the narrow parts 37 and which extend sideways to one of the edges of the ring 33.
  • the ring 33 is then embedded in the grooves 34 by a movement in the axis of the machine.
  • FIG. 6 shows a variant where the rail 18 'is modified: the side 23 is absent and the other flank 24 'is different because its edge 26' is oriented towards the outside of the recess 21; ledges 28 ' and 30 'of sectors 17' of ring 16 'are then directed into the interior of the assembly to trap this rim 26 '.
  • Side 23 is replaced by an extension 50 of sectors 17 'at this location so keep the junction with the 18 'rail and cover the hollow 21.
  • the bottom 22 of the rail 18 is now provided with a flange 51 oriented towards the outside of the assembly and engaged between two overlapping edges 52 and 53 of the extension 50.
  • the ring 33 separated from the rail 18 can be guaranteed against accidental displacement in service which could cause disassembly of the assembly.

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

Description

L'invention se rapporte à un dispositif d'assemblage d'un étage circulaire d'aubes pivotantes, souvent appelées aubes à calage variable et qu'on trouve dans un grand nombre de turbomachines modernes, généralement aux premiers étages du compresseur, afin de modifier les caractéristiques d'écoulement des gaz selon les régimes de la machine.The invention relates to a device assembling a circular stage of pivoting vanes, often called variable pitch vanes and which found in a large number of modern turbomachines, usually on the first stages of the compressor, so to modify the gas flow characteristics according to the speeds of the machine.

Les aubes pivotantes d'un même étage sont en général commandées par un dispositif commun composé d'un anneau de commande et de bielles articulées à l'anneau de commande et aux différentes aubes et situé autour des aubes, à l'extérieur du stator qui délimite la veine d'écoulement des gaz à travers laquelle les aubes s'étendent ; les autres extrémités des aubes, adjacentes au rotor, sont réunies par un assemblage annulaire. Cet assemblage était traditionnellement composé de deux anneaux, l'un en amont et l'autre en aval, qui étaient rapprochés et assemblés par des boulons de manière à emprisonner entre eux les pivots des aubes et les douilles permettant le pivotement. Cette solution était désavantageuse à cause du nombre relativement grand de boulons qui était nécessaire à l'assemblage des anneaux et au surcroít de poids qui en résultait.The pivoting blades of the same stage are in general controlled by a common compound device a control ring and connecting rods hinged to the control ring and at the different blades and located around the blades, outside the stator which delimits the gas flow stream through which the blades extend; the other ends of the blades, adjacent to the rotor, are joined by an assembly annular. This assembly was traditionally composed of two rings, one upstream and the other in downstream, which were brought together and assembled by bolts so as to trap the pivots between them vanes and bushings for pivoting. This solution was disadvantageous because of the number relatively large of bolts that was needed to the assembly of the rings and the additional weight which resulted.

US-A-4 395 195 décrit un système de retenue d'extrémités internes d'aubes pivotantes composé de deux groupes de segments annulaires qui se chevauchent en direction de la circonférence, les segments internes se joignant à mi-longueur des segments externes. Les segments internes qui sont emboítés dans les segments externes sont percés et soutiennent par des rondelles individuelles associées à des gorges de pivot les extrémités des aubes pivotantes en les empêchant de coulisser et de se déplacer en sens radial.US-A-4,395,195 describes a system for retaining the internal ends of blades pivoting composed of two groups of overlapping annular segments in the direction of the circumference, the internal segments joining at mid-length external segments. The internal segments which are nested in the external segments are drilled and supported by individual washers associated with pivot grooves the ends of the pivoting vanes by preventing it from sliding and moving in the radial direction.

On a plus récemment proposé (ainsi, dans le brevet français 2 556 410) d'emprisonner les douilles et les joints entre des éléments de blocage en secteur de cercle dont l'assemblage forme un anneau entier, et de compléter le dispositif par un rail annulaire - formé en pratique de deux parties assemblées - le long duquel les secteurs sont enfilés et qui retient les éléments à la disposition voulue, malgré les forces centrifuges et autres. Ce dispositif est plus léger, mais présente l'inconvénient d'être dépourvu de moyens pour retenir les aubes selon l'axe de leur pivot, c'est-à-dire en direction radiale de la machine. On éprouve donc le besoin d'un montage plus complet des aubes, et c'est à cela que satisfait l'invention. Elle est caractérisée par une structure annulaire pourvue de jours, qui s'ajoute aux secteurs soutenant les pivots et au rail maintenant l'assemblage des secteurs, et les jours sont formés de sorte que des parties de la structure annulaire adjacentes à eux sont engagées dans les gorges des pivots. On garantit donc que les pivots sont reliés entre eux par la structure annulaire, les gorges restant au rayon de cette structure.More recently, we have proposed (in the French Patent 2,556,410) to imprison the sockets and the joints between sector blocking elements of circle whose assembly forms a whole ring, and to complete the device with a rail annular - formed in practice of two parts assemblies - along which sectors are strung and which retains the elements in the desired arrangement, despite centrifugal and other forces. These measures is lighter, but has the disadvantage of being devoid of means for retaining the blades along the axis of their pivot, that is to say in the radial direction of the machine. We therefore feel the need for more mounting full of blades, and that's what satisfies the invention. It is characterized by a structure annular with days, which is added to the sectors supporting the pivots and the rail maintaining the assembly sectors, and the days are formed so that parts of the annular structure adjacent to them are engaged in the grooves of the pivots. We therefore guarantee that the pivots are connected together by the structure annular, the grooves remaining within the radius of this structure.

On peut distinguer deux conceptions principales : la structure annulaire peut être distincte du rail ou intégrée à lui. Dans la première conception, l'anneau est avantageusement continu et les jours sont alors de formes appropriées pour qu'on puisse réaliser le montage des pivots dans l'anneau. On peut concrètement envisager que les jours soient des fentes débouchant sur un des côtés de l'anneau ou des évidements comprenant des parties élargies par lesquelles on peut glisser les parties intactes, pas entaillées par les gorges des pivots. Dans la seconde conception, on peut prévoir la structure avec une section en double cornière, les cornières étant chacune composées d'une première âme s'élevant du rail et d'une seconde âme, les premières âmes étant parallèles et les secondes âmes étant cocylindriques et dirigées l'une vers l'autre à partir des premières âmes. We can distinguish two conceptions main: the annular structure can be separate from the rail or integrated into it. In the first design, the ring is advantageously continuous and the days are then of suitable forms so that one can mount the pivots in the ring. We can concretely consider that the days are slots opening on one side of the ring or recesses comprising parts enlarged by which you can slide the intact parts, not notched by the grooves of the pivots. In the second design, we can plan the structure with a double angle section, the angles being each composed of a first soul rising from the rail and a second soul, the first souls being parallel and the second souls being cocylindrical and directed one towards the other from the first souls.

On va maintenant décrire l'invention plus en détail à l'aide des figures suivantes, annexées à titre illustratif et non limitatif :

  • la figure 1 est une vue d'une première réalisation de l'invention,
  • la figure 2 est une vue de côté de la figure 1 selon la ligne II-II,
  • les figures 3 et 4 représentent deux réalisations de l'anneau, et
  • les figures 5 et 6 représentent deux autres réalisations possibles pour l'invention.
The invention will now be described in more detail with the aid of the following figures, annexed by way of illustration and not limitation:
  • FIG. 1 is a view of a first embodiment of the invention,
  • FIG. 2 is a side view of FIG. 1 along the line II-II,
  • FIGS. 3 and 4 represent two embodiments of the ring, and
  • Figures 5 and 6 show two other possible embodiments for the invention.

Le dispositif constituant l'invention et les parties adjacentes de la machine sont représentés complètement aux figures 1 et 2. Les aubes 1 à calage variable sont réparties en étages circulaires entre des étages de même forme d'aubes de rotor 2 rigidement lié à un rotor 3. Les aubes 1 sont affectées au redressement de l'écoulement et sont terminées à l'extérieur par un pivot de commande 4 qui traverse une enveloppe de stator 5 et se termine à l'extérieur de celle-ci par une tête 6 hexagonale ou carrée sur laquelle on a engagé une clé de manoeuvre 7, à l'extrémité d'une bielle de commande 8 dont l'autre extrémité coulisse à travers un bout d'arbre 9 pivotant d'un anneau de commande 10, dont la rotation autour de l'axe de la machine fait tourner les bielles de commande 8 et les aubes 1 de tout l'étage.The device constituting the invention and the adjacent parts of the machine are shown completely in Figures 1 and 2. The vanes 1 with timing variable are distributed in circular stages between stages of the same shape of rotor blades 2 rigidly linked to a rotor 3. The blades 1 are assigned to the flow straightening and are finished at the exterior by a control pivot 4 which passes through a stator cover 5 and ends outside of this by a hexagonal or square head 6 on which one engaged an operating key 7, to the end of a control rod 8 of which the other end slides through a pivoting shaft end 9 a control ring 10, the rotation of which around the machine axis rotates the connecting rods control 8 and the vanes 1 of the whole stage.

Les aubes 1 sont terminées à leur extrémité opposée par un pivot 11 de guidage tournant dans une douille 12 munie d'épaulements 13 et 14 circulaires à ses deux extrémités. La douille 12 est engagée dans les perçages 15 d'un anneau 16 de retenue composé, comme on le voit à la figure 2, de secteurs 17 terminés à leurs extrémités dans le sens angulaire par une moitié de perçage. Quand les secteurs 17 sont assemblés, les moitiés de perçage s'assemblent pour former les perçages 15 complets dans lesquels les douilles 12 et les pivots 11 sont emprisonnés. Les secteurs 17 ne sont pas reliés directement entre eux, mais enfilés dans un rail 18 composé de deux demi-anneaux 19 attachés entre eux par des boulons 20 à leurs jonctions.The vanes 1 are finished at their end opposite by a guide pivot 11 rotating in a bush 12 provided with circular shoulders 13 and 14 with its two ends. The sleeve 12 is engaged in the holes 15 of a compound retaining ring 16, as seen in Figure 2, sectors 17 completed at their ends in the angular direction by a half of drilling. When sectors 17 are assembled, the drilling halves come together to form holes 15 complete in which the sockets 12 and the pivots 11 are trapped. Sectors 17 are not not directly connected to each other, but strung in a rail 18 composed of two half-rings 19 attached between them by 20 bolts at their junctions.

Le rail 18 a sensiblement une section d'auge formant un creux 21. Il est composé d'un fond 22 des bords duquel se dressent deux flancs 23 et 24 dont chacun possède un rebord 25 ou 26 qui s'avance au-dessus du fond 22 et qui entoure un rebord, respectivement 27 ou 28, à l'extérieur des secteurs 17 pour les emprisonner. Pour compléter l'assemblage et le rendre plus rigide, le flanc 23 comprend encore un rebord interne 29, et le rebord 27 et la collerette 13 sont emprisonnés entre les rebords 25 et 29 ; et un rebord externe 30 est disposé de l'autre côté des secteurs 17 pour que le rebord 26 soit emprisonné entre les rebords 28 et 30 qui sont parallèles.The rail 18 has substantially a trough section forming a hollow 21. It is composed of a bottom 22 of edges of which stand two sides 23 and 24 of which each has a rim 25 or 26 which projects above from the bottom 22 and which surrounds a ledge, 27 or 28 respectively, outside sectors 17 to imprison them. To complete the assembly and make it more rigid, the sidewall 23 further comprises a internal rim 29, and the rim 27 and the flange 13 are trapped between the edges 25 and 29; and one outer edge 30 is arranged on the other side of the sectors 17 so that the rim 26 is trapped between the flanges 28 and 30 which are parallel.

Le fond 22 porte une couche de matière 31 dite abradable, c'est-à-dire à usure ou érosion facile, sur sa face interne, devant des léchettes 32 en forme de crête circulaire, qui se dressent du rotor 3. Il est bien connu que les dilatations thermiques différentielles des aubes 1 et du rotor 3 font que les léchettes 32 touchent la matière d'usure facile 31 pendant le service de la machine, frottent sur elle et l'usent en la modelant à leur forme ne laissant subsister qu'un très léger jeu qui s'oppose presque parfaitement aux fuites à cet endroit de la machine.The bottom 22 carries a layer of material 31 called abradable, i.e. easy to wear or erode, on its internal face, in front of wipers 32 in the form of circular ridge, which stand up from the rotor 3. It is well known that thermal expansions differential of the blades 1 and the rotor 3 cause the wipers 32 touch easy wear material 31 during the service of the machine, rub on it and wear it out by shaping it to their shape leaving subsist that a very slight game that almost opposes perfect for leaks at this point in the machine.

Un anneau 33 est abrité dans le creux 21 et engagé dans des gorges 34 des pivots 11. L'anneau 33 est continu sur toute sa circonférence et donc commun à tous les pivots 11. A ring 33 is housed in the recess 21 and engaged in grooves 34 pivots 11. The ring 33 is continuous over its entire circumference and therefore common to all pivots 11.

La figure 3 représente un exemple concret de réalisation qui permet de réaliser le montage : l'anneau 33 est muni de jours 35 composés d'une partie large 36, de diamètre supérieur à celui des pivots 11, qu'on peut donc engager à travers l'anneau 33 à cet endroit, et d'une partie étroite 37 dont la largeur est inférieure au diamètre des pivots 11 mais supérieure au diamètre de fond de gorge 34. Comme les parties étroite 37 et large 36 de chaque jour 35 sont contiguës et successives sur la circonférence de l'anneau 33, un mouvement de rotation de l'anneau 33 permet, après avoir enfoncé les pivots 11 à travers les parties larges 36 pour que les gorges 34, 33 arrivent à hauteur de l'anneau 33, de faire parvenir les bords 38 des parties étroites 37 dans les gorges 34 pour retenir ainsi les aubes 1 dans la direction radiale de la machine.Figure 3 shows a concrete example of realization which makes it possible to carry out the assembly: the ring 33 is provided with 35 days composed of a part wide 36, with a diameter greater than that of the pivots 11, which can therefore be engaged through the ring 33 at this place, and a narrow part 37 whose width is less than the diameter of the pivots 11 but greater than throat bottom diameter 34. As the narrow parts 37 and wide 36 of each day 35 are contiguous and successive on the circumference of the ring 33, a rotational movement of the ring 33 allows, after having driven the pivots 11 through the parts wide 36 so that the grooves 34, 33 arrive at height of the ring 33, to send the edges 38 of the narrow parts 37 in the grooves 34 to retain thus the vanes 1 in the radial direction of the machine.

La figure 4 montre que d'autres conceptions sont possibles pour assurer le même effet de maintien, et qu'en particulier les jours 35 sous forme d'évidements au centre de l'anneau 33 peuvent être remplacés par des fentes 39 dont la largeur est identique à celle des parties étroites 37 et qui s'étendent en direction latérale jusqu'à un des bords de l'anneau 33. L'anneau 33 est alors encastré dans les gorges 34 par un mouvement dans l'axe de la machine.Figure 4 shows that other designs are possible to ensure the same holding effect, and that especially the 35 days in form of recesses in the center of the ring 33 can be replaced by slots 39 whose width is identical to that of the narrow parts 37 and which extend sideways to one of the edges of the ring 33. The ring 33 is then embedded in the grooves 34 by a movement in the axis of the machine.

D'autres conceptions peuvent être envisagées. C'est ainsi (comme on l'illustre à la figure 5) que l'anneau 33 peut être remplacé par un anneau 43 intégré à un rail 18 par ailleurs de même forme ou sensiblement que précédemment. Il se compose alors d'une paire de cornières 44 presque juxtaposées mais distinctes et composées d'une première âme 45 reliée au fond 22 et qui s'élève jusqu'à une seconde âme 46. Les premières âmes 45 sont parallèles entre elles, et les secondes âmes 46, qui appartiennent à un même cylindre, sont orientées l'une vers l'autre à partir des premières âmes 45 et séparées par une rainure circulaire 47 qui est un intervalle de largeur constante dans lequel on peut enfiler les pivots 11 par leur gorge 34. Les bords libres 48 et convergents des secondes âmes 46 s'engagent donc dans les gorges 34.Other designs can be considered. This is how (as illustrated in Figure 5) that the ring 33 can be replaced by an integrated ring 43 to a rail 18 otherwise of the same shape or substantially than previously. It then consists of a pair of angles 44 almost juxtaposed but distinct and composed of a first core 45 connected to the bottom 22 and which rises to a second soul 46. The first 45 souls are parallel to each other, and the seconds souls 46, which belong to the same cylinder, are oriented towards each other from the first cores 45 and separated by a circular groove 47 which is a constant width interval in which we can thread the pivots 11 through their grooves 34. The edges free 48 and converging second souls 46 therefore enter the grooves 34.

On a représenté à la figure 6 une variante où le rail 18' est modifié : le flanc 23 est absent et l'autre flanc 24' est différent, car son rebord 26' est orienté vers l'extérieur du creux 21 ; les rebords 28' et 30' des secteurs 17' de l'anneau 16' sont alors dirigés vers l'intérieur de l'assemblage pour emprisonner ce rebord 26'. Le flanc 23 est remplacé par un prolongement 50 des secteurs 17' à cet endroit afin de conserver la jonction avec le rail 18' et couvrir le creux 21. Le fond 22 du rail 18 est désormais muni d'un rebord 51 orienté vers l'extérieur de l'assemblage et engagé entre deux rebords 52 et 53 superposés du prolongement 50.FIG. 6 shows a variant where the rail 18 'is modified: the side 23 is absent and the other flank 24 'is different because its edge 26' is oriented towards the outside of the recess 21; ledges 28 ' and 30 'of sectors 17' of ring 16 'are then directed into the interior of the assembly to trap this rim 26 '. Side 23 is replaced by an extension 50 of sectors 17 'at this location so keep the junction with the 18 'rail and cover the hollow 21. The bottom 22 of the rail 18 is now provided with a flange 51 oriented towards the outside of the assembly and engaged between two overlapping edges 52 and 53 of the extension 50.

L'anneau 33 séparé du rail 18 peut être garanti contre un déplacement accidentel en service qui pourrait provoquer un démontage de l'assemblage. On peut par exemple le lier à un des secteurs 17 par une vis ou un pion 40 emmanché à force.The ring 33 separated from the rail 18 can be guaranteed against accidental displacement in service which could cause disassembly of the assembly. We can for example link it to one of sectors 17 by a screw or a pin 40 force fitted.

Claims (8)

  1. Device for assembling a circular stage of pivoting guide vanes (1), comprising a set of sectors (17, 17') connected in a ring (16, 16') and equipped with recesses (15) for housing support bushings (12) for pivoting the pivots (11) of the guide vanes (1) and grooves (34) in these pivots (11), an annular rail (18, 18') on which the sectors are held, characterized by an annular structure (33, 43) with openings (35, 39, 47), parts (38, 48) of the annular structure which are adjacent to the openings being engaged in the said grooves (34) of the pivots (11).
  2. Device for assembling a circular stage of pivoting guide vanes according to Claim 1, characterized in that the rail has a hollow cross-section (21) and comprises a bottom part (22) which covers the pivots (11), the annular structure (33, 43) being arranged between the bottom (22) and the sectors (17, 17').
  3. Device for assembling a circular stage of pivoting guide vanes according to Claim 2, characterized in that the bottom part (22) carries a layer of readily-wearing material (31) belonging to a sealing device (32).
  4. Device for assembling a circular stage of pivoting guide vanes according to any one of Claims 1 to 3, characterized in that the annular structure (33) is a continuous ring distinct from the rail (18).
  5. Device for assembling a circular stage of pivoting guide vanes according to Claim 4, characterized in that the openings are composed of two adjacent portions, the first (36) of which is wider than the diameter of the pivots, and the second (37) of which is narrower than the diameter of the pivots (11), except at the grooves (34).
  6. Device for assembling a circular stage of pivoting guide vanes according to Claim 4, characterized in that the openings (39) are slots opening out on one of the sides of the ring.
  7. Device for assembling a circular stage of pivoting guide vanes according to any one of Claims 1 to 3, characterized in that the annular structure (43) is incorporated into the rail (18, 18').
  8. Device for assembling a circular stage of pivoting guide vanes according to Claims 2 and 7, characterized in that the annular structure has a cross-section in the shape of a double angle bracket, the angle brackets (44) each being composed of a first leg (45) rising up from the bottom (22) and of a second leg (46), the first legs being parallel and the second legs being co-cylindrical and facing towards one another from the first legs.
EP95401862A 1994-08-10 1995-08-09 Assembly device for a circular row of variable guide vanes Expired - Lifetime EP0696675B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9409867A FR2723614B1 (en) 1994-08-10 1994-08-10 DEVICE FOR ASSEMBLING A CIRCULAR STAGE OF PIVOTING VANES.
FR9409867 1994-08-10

Publications (2)

Publication Number Publication Date
EP0696675A1 EP0696675A1 (en) 1996-02-14
EP0696675B1 true EP0696675B1 (en) 1998-09-30

Family

ID=9466205

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95401862A Expired - Lifetime EP0696675B1 (en) 1994-08-10 1995-08-09 Assembly device for a circular row of variable guide vanes

Country Status (4)

Country Link
US (1) US5636968A (en)
EP (1) EP0696675B1 (en)
DE (1) DE69505074T2 (en)
FR (1) FR2723614B1 (en)

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Also Published As

Publication number Publication date
FR2723614B1 (en) 1996-09-13
FR2723614A1 (en) 1996-02-16
EP0696675A1 (en) 1996-02-14
DE69505074D1 (en) 1998-11-05
DE69505074T2 (en) 1999-03-11
US5636968A (en) 1997-06-10

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