EP0947668A1 - Circular row of turbomachine guide vanes with inner ends assembled by a linking ring - Google Patents

Circular row of turbomachine guide vanes with inner ends assembled by a linking ring Download PDF

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Publication number
EP0947668A1
EP0947668A1 EP99400514A EP99400514A EP0947668A1 EP 0947668 A1 EP0947668 A1 EP 0947668A1 EP 99400514 A EP99400514 A EP 99400514A EP 99400514 A EP99400514 A EP 99400514A EP 0947668 A1 EP0947668 A1 EP 0947668A1
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EP
European Patent Office
Prior art keywords
ring
pivots
support ring
notches
lips
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
EP99400514A
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German (de)
French (fr)
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EP0947668B1 (en
Inventor
Daniel André Agram
Anne-Cécile Christine Marlin
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 EP0947668A1 publication Critical patent/EP0947668A1/en
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Publication of EP0947668B1 publication Critical patent/EP0947668B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • 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
    • 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
    • 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 floor circular blades with inner ends united by a connecting ring.
  • Such a construction is encountered in turbomachinery for stages of blades of stator-related rectifiers: the outer ends blades are supported by the stator and inner ends by a common connecting ring to all the blades of the floor and which therefore contributes to stiffen their assembly by uniting them.
  • the outer ends and inner blades consist of supported pivots in respective bearings of the stator and the ring liaison.
  • This device is effective but present the disadvantage that we must provide a ring which increases the weight and the cost of machine manufacturing.
  • the invention therefore relates to a device having the same effects but lacking of this inconvenience of having to add an unnecessary part moreover: it is proposed to ensure the retention of inner pivots by a structural element already present in the link ring and that we are content to modify slightly.
  • the invention can be defined as a circular stage of blades having outer pivots housed in bearings of pivoting of a stator and internal pivots housed in inner pivot bearings of a ring link ;
  • the connecting ring is composed of a support ring and stiffening ring interlaced, the support ring carrying the bearings of internal pivoting and the stiffening ring ends in two lips directed towards each other and penetrating in respective grooves of the support ring, the interior pivots being hollowed out with a notch; according to the invention, one of the lips extends to through the support ring and enters the gashes.
  • the notches do not extend only over a sector of circumference and therefore offer a stop to the angular displacements of dawn, which is also interesting when it is broken.
  • a particular embodiment is distinguishes by a construction in two sections of blade pivots for easier assembly: the lips of the stiffening ring extend over circles of two different diameters, and the pivots are formed of two sections, including an engaged journal section in a bearing socket and an enlarged section, located between the journal and a blade of the dawn, the notches being dug in the enlarged sections, the lip opposite lip penetrating notches extending in front of the trunnions.
  • the machine includes an external stator 1 and at least one blade stage 2 equipped with the invention; the vanes 2 have a first pivot end outside 3 passing through the stator 1 at the location of a outer bearing 4 and an opposite end forming a inner pivot 5 engaged in a bearing 6 of a ring connecting 7 common to all the vanes 2 of the stage.
  • the outer pivot 3 is provided with shoulders 8 and 9 between which the bearing 4 is retained, which limits the radial movement of blade 2 in the machine (on could also speak of axial displacement in considering the direction of pivots 3 and 5).
  • the pivot outside 3 comes out of stator 1 and ends in one connection with a control lever 10 of which the other end is connected to a common control ring 11 to all the vanes 2 of the stage; the control ring 11 is arranged around stator 1, and it suffices to turn to control the rotation of the levers 10 and that of the vanes 2 around their pivots 3 and 5.
  • the connecting ring 7 is essentially composed of a support ring 12, in which the bearings 6 are hollowed out, and a stiffening ring 13 wrapping part of the support ring 12.
  • the reason for this construction can be explained by reference to Figure 2: we see that the ring of support 12 is not unitary but composed of sectors 14 abutments, two, four or eight in number current achievements, and that the stiffening ring 13 is the way to keep them in place. It is itself composed of two semi-circular sectors 15 and reunited with each other.
  • the stiffening ring 13 has a section similar to that of a rail and having a bottom 17 under the ring support 12, sidewalls 18 partially covering the flat faces of the support ring 12 and the lips 19 and 20 located at the end of the sides 18 and 19 penetrating in grooves 22 and 23 of the connecting ring 12. As the lips 20 and 21 are directed one towards the other, they hold the stiffening ring 13 on the support ring 12 and keep them interlaced.
  • the inner bearing 6 is formed by a sleeve 27 engaged through a hole in the connecting ring 12 and of which the outer surface is threaded: like the pivot interior 5 is actually composed of a pin 28 engaged in the socket 27 and a widening 29 located between the pin 28 and a blade 30 of the blade 2, we see that the setting of the connecting ring 7 is produced by screwing the sockets 27 into the holes threaded from the support ring 12 until the outer ends 31 of sockets 27 abut against the extended parts 29. This prohibits deflections and vibrations in the radial direction of the connecting ring 7.
  • cylindrical lips 20 and 21 do not belong to circles of the same diameter but, as one of the flanks 19 is much wider than the other 18, the lip 21 which he wears extends in front the widened part 29, while the other comes only in front of the pin 28.
  • This lip 21 is further long enough to fit into a cut 31 in the enlarged part 29, the groove 23 which is there partner crossing right through a wall of the connecting ring 12.
  • the material of the enlarged part 29 which is located between the notch 31 and the pin 28 forms a rim 32 which abuts against the lip 21 in outward movement of dawn 2 due to example to a rupture of it, and opposes the extraction of the inner pivot 5. The retention of dawn is therefore assured with this construction particularly simple, in accordance with the objective announced above.
  • Figure 3 completes the presentation of this invention by perhaps representing more clearly its main elements, the socket 27 having however been omitted from representation for clarity.
  • the notch 31 advantageously does not extend that on a sector of circumference and therefore ends in two lateral abutment surfaces 33 which limit the angular deflection of blade 2 by touching the lip 21, which is particularly advantageous in the event of breaking of dawn 2, when the blade fragment 30 adjoining the inner pivot 5 would be feathered (i.e. would freely follow the direction of the gas flow) erratically.

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

Abstract

Un étage d'aube (2) de redresseurs lié à un stator (1) est soutenu à ses extrémités intérieures (5) par un anneau de liaison (7) composé d'un anneau de support (12) et d'un anneau de raidissage (13) dont une des lèvres de retenue (21) pénètre profondément dans l'anneau de support (12) et même dans des entailles (31) des extrémités (5) des aubes (2). Une extraction accidentelle des aubes (2), consécutive à une rupture, est donc interdite. <IMAGE>A blade stage (2) of rectifiers linked to a stator (1) is supported at its inner ends (5) by a connecting ring (7) composed of a support ring (12) and a ring of stiffening (13) of which one of the retaining lips (21) penetrates deeply into the support ring (12) and even into notches (31) of the ends (5) of the blades (2). Accidental extraction of the blades (2), following a rupture, is therefore prohibited. <IMAGE>

Description

L'invention se rapporte à un étage circulaire d'aubes aux extrémités intérieures unies par un anneau de liaison.The invention relates to a floor circular blades with inner ends united by a connecting ring.

Une telle construction est rencontrée dans les turbomachines pour des étages d'aubes de redresseurs liés au stator : les extrémités extérieures des aubes sont soutenues par le stator et les extrémités intérieures par un anneau de liaison commun à toutes les aubes de l'étage et qui contribue donc à raidir leur assemblage en les unissant. Comme les aubes de redresseurs sont en général pivotantes pour améliorer les performances de la machine à différents régimes en réglant l'angle de redressement de l'écoulement des gaz, les extrémités extérieures et intérieures des aubes consistent en des pivots soutenus dans des paliers respectifs du stator et de l'anneau de liaison.Such a construction is encountered in turbomachinery for stages of blades of stator-related rectifiers: the outer ends blades are supported by the stator and inner ends by a common connecting ring to all the blades of the floor and which therefore contributes to stiffen their assembly by uniting them. Like dawn rectifiers are generally pivotable for improve machine performance at different regimes by adjusting the righting angle of the gas flow, the outer ends and inner blades consist of supported pivots in respective bearings of the stator and the ring liaison.

On s'intéresse ici à la partie intérieure des aubes et surtout à l'agencement par lequel les pivots intérieurs sont logés dans les paliers de l'anneau de liaison : si une aube se rompt en deux par son milieu, le fragment extérieur reste en place car le pivot extérieur est normalement muni d'épaulements butant contre les bords du palier de stator, mais le pivot intérieur est dépourvu de tels épaulements afin de laisser l'anneau de liaison se placer au meilleur endroit en coulissant sur les pivots intérieurs des aubes de l'étage, ce qui fait que le fragment intérieur de l'aube rompue peut se libérer, le pivot se déchaussant du palier, et être projeté vers l'aval de la machine par l'écoulement d'air, avec la conséquence que les aubes de plusieurs étages suivants pourront être détruites. Cela est d'autant plus vrai que les aubes pivotantes de redresseur sont normalement placées près de l'entrée du compresseur à basse pression, de sorte que les deux compresseurs, à basse et haute pression, des turbomachines usuelles sont exposés aux accidents qu'on vient de décrire.We are interested here in the inner part blades and especially the arrangement by which the inner pivots are housed in the bearings of the connecting ring: if a dawn breaks in two by its middle, the outer fragment remains in place because the outer pivot is normally provided with shoulders abutting the edges of the stator bearing, but the inner pivot is devoid of such shoulders so to let the link ring be placed at the best sliding place on the inner pivots of the upstairs vanes, which makes the inner fragment of the broken dawn can be released, the pivot is taking off from the landing, and being thrown downstream of the machine by the air flow, with the consequence that the following multi-stage blades can be destroyed. This is all the more true since the pivoting stator vanes are normally placed near the inlet of the low pressure compressor, so the two compressors, low and high pressure, conventional turbomachines are exposed to accidents just described.

Des précautions ont déjà été prévues dans de nombreux documents de l'art antérieur pour s'opposer à l'extraction du pivot intérieur en cas de rupture d'une aube. On citera en particulier le brevet français 2 723 614 de la demanderesse, dans lequel un anneau supplémentaire (portant la référence 33 dans ce document) est ajouté à l'anneau de liaison pour former une butée sous les paliers de pivotement intérieur. Plus précisément, l'anneau supplémentaire est ajouré, les bouts des pivots intérieurs entaillés d'une gorge, et les bords des jours de l'anneau supplémentaire sont engagés dans les gorges des pivots intérieurs : un mouvement vers l'extérieur des pivots intérieurs aurait pour effet d'entraíner l'anneau supplémentaire et de le faire buter contre l'anneau de liaison.Precautions have already been planned in many documents of the prior art to oppose when removing the inner pivot in the event of a break of a dawn. Mention will be made in particular of the French patent 2,723,614 to the plaintiff, in which a ring additional (marked as 33 in this document) is added to the link ring to form a stop under the inner pivot bearings. More specifically, the additional ring is perforated, the ends of the inner pivots notched with a groove, and the edges of the days of the extra ring are engaged in the grooves of the inner pivots: a outward movement of the inner pivots would have has the effect of driving the additional ring and abut against the connecting ring.

Ce dispositif est efficace mais présente l'inconvénient qu'on doit prévoir un anneau supplémentaire qui accroít le poids et le coût de fabrication de la machine. L'invention a donc trait à un dispositif présentant les mêmes effets mais dépourvu de cet inconvénient de devoir ajouter une pièce inutile par ailleurs : on propose d'assurer la rétention des pivots intérieurs par un élément de structure déjà présent dans l'anneau de liaison et qu'on se contente de modifier légèrement.This device is effective but present the disadvantage that we must provide a ring which increases the weight and the cost of machine manufacturing. The invention therefore relates to a device having the same effects but lacking of this inconvenience of having to add an unnecessary part moreover: it is proposed to ensure the retention of inner pivots by a structural element already present in the link ring and that we are content to modify slightly.

Sous sa forme la plus générale, l'invention peut être définie comme un étage circulaire d'aubes ayant des pivots extérieurs logés dans des paliers de pivotement d'un stator et des pivots intérieurs logés dans des paliers de pivotement intérieurs d'un anneau de liaison ; l'anneau de liaison est composé d'un anneau de support et d'un anneau de raidissage entrelacés, l'anneau de support portant les paliers de pivotement intérieurs et l'anneau de raidissage finit en deux lèvres dirigées l'une vers l'autre et pénétrant dans des rainures respectives de l'anneau de support, les pivots intérieurs étant creusés d'une entaille ; conformément à l'invention, une des lèvres s'étend à travers l'anneau de support et pénètre dans les entailles.In its most general form, the invention can be defined as a circular stage of blades having outer pivots housed in bearings of pivoting of a stator and internal pivots housed in inner pivot bearings of a ring link ; the connecting ring is composed of a support ring and stiffening ring interlaced, the support ring carrying the bearings of internal pivoting and the stiffening ring ends in two lips directed towards each other and penetrating in respective grooves of the support ring, the interior pivots being hollowed out with a notch; according to the invention, one of the lips extends to through the support ring and enters the gashes.

Selon un perfectionnement, les entailles ne s'étendent que sur un secteur de circonférence et offrent donc une butée aux déplacements angulaires de l'aube, ce qui est également intéressant quand elle est rompue.According to an improvement, the notches do not extend only over a sector of circumference and therefore offer a stop to the angular displacements of dawn, which is also interesting when it is broken.

Un mode particulier de réalisation se distingue par une construction en deux sections des pivots des aubes pour faciliter le montage : les lèvres de l'anneau de raidissage s'étendent sur des cercles de deux diamètres différents, et les pivots sont formés de deux sections, dont une section de tourillon engagée dans une douille du palier et une section élargie, située entre le tourillon et une pale de l'aube, les entailles étant creusées dans les sections élargies, la lèvre opposée à la lèvre pénétrant dans les entailles s'étendant devant les tourillons. A particular embodiment is distinguishes by a construction in two sections of blade pivots for easier assembly: the lips of the stiffening ring extend over circles of two different diameters, and the pivots are formed of two sections, including an engaged journal section in a bearing socket and an enlarged section, located between the journal and a blade of the dawn, the notches being dug in the enlarged sections, the lip opposite lip penetrating notches extending in front of the trunnions.

L'invention va maintenant être décrite plus en détail à l'aide des figures suivantes, qui sont annexées pour en illustrer une réalisation particulière :

  • la figure 1 est une demi-coupe longitudinale d'un étage d'aubes de redresseur, montrant une de ces aubes ;
  • la figure 2 est une vue de face de l'étage d'aubes ;
  • et la figure 3 représente plus en détail l'imbrication d'un pivot intérieur d'aube dans l'anneau de support.
The invention will now be described in more detail with the aid of the following figures, which are annexed to illustrate a particular embodiment:
  • Figure 1 is a longitudinal half-section of a stage of stator vanes, showing one of these vanes;
  • Figure 2 is a front view of the blade stage;
  • and Figure 3 shows in more detail the nesting of an inner blade pivot in the support ring.

La machine comprend un stator 1 extérieur et au moins un étage d'aubes 2 équipé de l'invention ; les aubes 2 possèdent une première extrémité en pivot extérieur 3 traversant le stator 1 à l'emplacement d'un palier extérieur 4 et une extrémité opposée formant un pivot intérieur 5 engagé dans un palier 6 d'un anneau de liaison 7 commun à toutes les aubes 2 de l'étage. Le pivot extérieur 3 est muni d'épaulements 8 et 9 entre lesquels le palier 4 est retenu, ce qui limite le déplacement radial de l'aube 2 dans la machine (on pourrait aussi parler de déplacement axial en considérant la direction des pivots 3 et 5). Le pivot extérieur 3 sort du stator 1 et finit en un raccordement avec un levier de commande 10 dont l'autre extrémité est reliée à un anneau de commande 11 commun à toutes les aubes 2 de l'étage ; l'anneau de commande 11 est disposé autour du stator 1, et il suffit de le tourner pour commander la rotation des leviers 10 et celle des aubes 2 autour de leurs pivots 3 et 5.The machine includes an external stator 1 and at least one blade stage 2 equipped with the invention; the vanes 2 have a first pivot end outside 3 passing through the stator 1 at the location of a outer bearing 4 and an opposite end forming a inner pivot 5 engaged in a bearing 6 of a ring connecting 7 common to all the vanes 2 of the stage. The outer pivot 3 is provided with shoulders 8 and 9 between which the bearing 4 is retained, which limits the radial movement of blade 2 in the machine (on could also speak of axial displacement in considering the direction of pivots 3 and 5). The pivot outside 3 comes out of stator 1 and ends in one connection with a control lever 10 of which the other end is connected to a common control ring 11 to all the vanes 2 of the stage; the control ring 11 is arranged around stator 1, and it suffices to turn to control the rotation of the levers 10 and that of the vanes 2 around their pivots 3 and 5.

L'anneau de liaison 7 est essentiellement composé d'un anneau de support 12, dans lequel les paliers 6 sont creusés, et d'un anneau de raidissage 13 enveloppant une partie de l'anneau de support 12. La raison de cette construction peut être expliquée en référence à la figure 2 : on voit que l'anneau de support 12 n'est pas unitaire mais composé de secteurs 14 aboutés, au nombre de deux, quatre ou huit dans les réalisations courantes, et que l'anneau de raidissage 13 constitue le moyen de les maintenir en place. Il est lui-même composé de deux secteurs 15 semi-circulaires et réunis entre eux. En revenant à la figure 1, on voit que l'anneau de raidissage 13 a une section analogue à celle d'un rail et possédant un fond 17 sous l'anneau de support 12, des flancs 18 couvrant partiellement les faces planes de l'anneau de support 12 et des lèvres 19 et 20 situées au bout des flancs 18 et 19 pénétrant dans des rainures 22 et 23 de l'anneau de liaison 12. Comme les lèvres 20 et 21 sont dirigées l'une vers l'autre, elles retiennent l'anneau de raidissage 13 sur l'anneau de support 12 et les maintiennent entrelacés. Notons en passant qu'une fonction supplémentaire de l'anneau de raidissage 13 est de porter une matière dite abradable 24, c'est-à-dire d'usure facile, sur la face intérieure du fond 17 pour venir au contact de crêtes circulaires ou léchettes 25 d'un rotor 26 et produire avec elles un joint presque entièrement étanche pendant le régime normal de la machine, quand les dilatations thermiques différentielles ont approché les léchettes 25 de la matière abradable 24 et l'on entamée par frottement. On doit aussi mentionner que le palier intérieur 6 est formé par une douille 27 engagée à travers un perçage de l'anneau de liaison 12 et dont la surface extérieure est filetée : comme le pivot intérieur 5 est en réalité composé d'un tourillon 28 engagé dans la douille 27 et d'un élargissement 29 situé entre le tourillon 28 et une pale 30 de l'aube 2, on voit que le réglage de l'anneau de liaison 7 est produit en vissant les douilles 27 dans les perçages taraudés de l'anneau de support 12 jusqu'à ce que les extrémités extérieures 31 des douilles 27 butent contre les parties élargies 29. On interdit ainsi les débattements et les vibrations en direction radiale de l'anneau de liaison 7.The connecting ring 7 is essentially composed of a support ring 12, in which the bearings 6 are hollowed out, and a stiffening ring 13 wrapping part of the support ring 12. The reason for this construction can be explained by reference to Figure 2: we see that the ring of support 12 is not unitary but composed of sectors 14 abutments, two, four or eight in number current achievements, and that the stiffening ring 13 is the way to keep them in place. It is itself composed of two semi-circular sectors 15 and reunited with each other. Returning to Figure 1, we see that the stiffening ring 13 has a section similar to that of a rail and having a bottom 17 under the ring support 12, sidewalls 18 partially covering the flat faces of the support ring 12 and the lips 19 and 20 located at the end of the sides 18 and 19 penetrating in grooves 22 and 23 of the connecting ring 12. As the lips 20 and 21 are directed one towards the other, they hold the stiffening ring 13 on the support ring 12 and keep them interlaced. Let us note in passing that an additional function of the stiffening ring 13 is to wear a material said abradable 24, that is to say of easy wear, on the inner face of the bottom 17 to come into contact with circular ridges or wipers 25 of a rotor 26 and produce almost a joint with them waterproof during normal machine operation, when the differential thermal expansions have approached the wipers 25 of the abradable material 24 and the started by friction. It should also be mentioned that the inner bearing 6 is formed by a sleeve 27 engaged through a hole in the connecting ring 12 and of which the outer surface is threaded: like the pivot interior 5 is actually composed of a pin 28 engaged in the socket 27 and a widening 29 located between the pin 28 and a blade 30 of the blade 2, we see that the setting of the connecting ring 7 is produced by screwing the sockets 27 into the holes threaded from the support ring 12 until the outer ends 31 of sockets 27 abut against the extended parts 29. This prohibits deflections and vibrations in the radial direction of the connecting ring 7.

Contrairement à d'autres réalisations, déjà connues dans l'art, les lèvres 20 et 21 cylindrique n'appartiennent pas à des cercles de même diamètre mais, comme un des flancs 19 est beaucoup plus large que l'autre 18, la lèvre 21 qu'il porte s'étend devant la partie élargie 29, alors que l'autre ne vient que devant le tourillon 28. Cette lèvre 21 est de plus assez longue pour entrer dans une entaille 31 ménagée dans la partie élargie 29, la rainure 23 qui lui est associée traversant de part en part une paroi de l'anneau de liaison 12. La matière de la partie élargie 29 qui est située entre l'entaille 31 et le tourillon 28 forme un rebord 32 qui bute contre la lèvre 21 en cas de mouvement vers l'extérieur de l'aube 2 dû par exemple à une rupture de celle-ci, et s'oppose à l'extraction du pivot intérieur 5. La rétention de l'aube est donc assurée avec cette construction particulièrement simple, conformément à l'objectif annoncé plus haut.Unlike other achievements, already known in the art, cylindrical lips 20 and 21 do not belong to circles of the same diameter but, as one of the flanks 19 is much wider than the other 18, the lip 21 which he wears extends in front the widened part 29, while the other comes only in front of the pin 28. This lip 21 is further long enough to fit into a cut 31 in the enlarged part 29, the groove 23 which is there partner crossing right through a wall of the connecting ring 12. The material of the enlarged part 29 which is located between the notch 31 and the pin 28 forms a rim 32 which abuts against the lip 21 in outward movement of dawn 2 due to example to a rupture of it, and opposes the extraction of the inner pivot 5. The retention of dawn is therefore assured with this construction particularly simple, in accordance with the objective announced above.

La figure 3 complète l'exposé de cette invention en représentant peut-être plus clairement ses principaux éléments, la douille 27 ayant toutefois été omise de la représentation à des fins de clarté. On remarque que l'entaille 31 ne s'étend avantageusement que sur un secteur de circonférence et finit donc en deux surfaces latérales de butée 33 qui limitent le débattement angulaire de l'aube 2 en touchant la lèvre 21, ce qui est particulièrement avantageux en cas de rupture de l'aube 2, quand le fragment de pale 30 attenant au pivot intérieur 5 se mettrait en drapeau (c'est-à-dire suivrait librement la direction du courant de gaz) de façon erratique.Figure 3 completes the presentation of this invention by perhaps representing more clearly its main elements, the socket 27 having however been omitted from representation for clarity. We note that the notch 31 advantageously does not extend that on a sector of circumference and therefore ends in two lateral abutment surfaces 33 which limit the angular deflection of blade 2 by touching the lip 21, which is particularly advantageous in the event of breaking of dawn 2, when the blade fragment 30 adjoining the inner pivot 5 would be feathered (i.e. would freely follow the direction of the gas flow) erratically.

Claims (3)

Etage circulaire d'aubes (2) ayant des pivots extérieurs (3) logés dans des paliers (4) de pivotement extérieurs d'un stator (1) et des pivots intérieurs (5) logés dans des paliers (6) de pivotement intérieurs d'un anneau de liaison (7) composé d'un anneau de support (12) et d'un anneau de raidissage (13) entrelacés, l'anneau de support (12) portant les paliers (6) de pivotement intérieurs et l'anneau de raidissage (13) finissant en deux lèvres (20, 21) dirigées l'une vers l'autre et pénétrant dans des rainures (22, 23) respectives de l'anneau de support (12), les pivots intérieurs (5) étant creusés d'entailles (31), caractérisé en ce qu'une desdites lèvres s'étend à travers l'anneau de support (12) et pénètre dans les entailles (31).Circular stage of vanes (2) having external pivots (3) housed in bearings (4) of external pivoting of a stator (1) and pivots interiors (5) housed in pivot bearings (6) interiors of a connecting ring (7) composed of a support ring (12) and a stiffening ring (13) intertwined, the support ring (12) carrying the inner pivot bearings (6) and the ring stiffening (13) ending in two lips (20, 21) directed towards each other and penetrating into respective grooves (22, 23) of the support ring (12), the inner pivots (5) being hollowed out notches (31), characterized in that one of said lips extends through the support ring (12) and penetrates into the notches (31). Etage circulaire d'aubes suivant la revendication 1, caractérisé en ce que les entailles (31) ne s'étendent que sur un secteur de circonférence.Circular stage of blades according to claim 1, characterized in that the notches (31) extend only over a sector of circumference. Etage circulaire d'aubes suivant la revendication 1, caractérisé en ce que les lèvres (21, 22) de l'anneau de raidissage (13) s'étendent sur des cercles de deux diamètres différents, et les pivots sont formés de deux sections (28, 29), dont une section de tourillon (28) engagée dans une douille (27) du palier (6) et une section élargie (29), située entre le tourillon et une pale (30) de l'aube, les entailles (31) étant creusées dans les sections élargies (29), la lèvre (20) opposée à la lèvre (21) pénétrant dans la rainure s'étendant devant les tourillons (28).Circular stage of blades according to claim 1, characterized in that the lips (21, 22) of the stiffening ring (13) extend over circles of two different diameters, and pivots consist of two sections (28, 29), one of which is a section pin (28) engaged in a sleeve (27) of the bearing (6) and an enlarged section (29), located between the dawn pin and blade (30), notches (31) being dug in the enlarged sections (29), the lip (20) opposite the lip (21) entering the groove extending in front of the pins (28).
EP99400514A 1998-03-05 1999-03-04 Circular row of turbomachine guide vanes with inner ends assembled by a linking ring Expired - Lifetime EP0947668B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9802675 1998-03-05
FR9802675A FR2775731B1 (en) 1998-03-05 1998-03-05 CIRCULAR STAGE OF BLADES AT INTERIOR ENDS JOINED BY A CONNECTING RING

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EP0947668A1 true EP0947668A1 (en) 1999-10-06
EP0947668B1 EP0947668B1 (en) 2000-05-03

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US (1) US6129512A (en)
EP (1) EP0947668B1 (en)
JP (1) JP3877032B2 (en)
CA (1) CA2263255C (en)
DE (1) DE69900004T2 (en)
FR (1) FR2775731B1 (en)

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Also Published As

Publication number Publication date
CA2263255A1 (en) 1999-09-05
US6129512A (en) 2000-10-10
JPH11315702A (en) 1999-11-16
EP0947668B1 (en) 2000-05-03
CA2263255C (en) 2009-02-24
FR2775731B1 (en) 2000-04-07
DE69900004T2 (en) 2001-03-01
DE69900004D1 (en) 2000-06-08
FR2775731A1 (en) 1999-09-10
JP3877032B2 (en) 2007-02-07

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