EP1801357B1 - Bladed nozzle of a turbomachine, turbomachine comprising this nozzle and turbomachine vane - Google Patents

Bladed nozzle of a turbomachine, turbomachine comprising this nozzle and turbomachine vane Download PDF

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Publication number
EP1801357B1
EP1801357B1 EP05112843A EP05112843A EP1801357B1 EP 1801357 B1 EP1801357 B1 EP 1801357B1 EP 05112843 A EP05112843 A EP 05112843A EP 05112843 A EP05112843 A EP 05112843A EP 1801357 B1 EP1801357 B1 EP 1801357B1
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EP
European Patent Office
Prior art keywords
platform
blades
platforms
blade
ring
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EP05112843A
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German (de)
French (fr)
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EP1801357A1 (en
Inventor
André Lhoest
Georges Broers
Georges Duchaine
Xavier Wery
Thomas Colmant
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Safran Aero Boosters SA
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Techspace Aero SA
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Publication date
Application filed by Techspace Aero SA filed Critical Techspace Aero SA
Priority to DE602005024425T priority Critical patent/DE602005024425D1/en
Priority to EP05112843A priority patent/EP1801357B1/en
Priority to AT05112843T priority patent/ATE486195T1/en
Priority to US11/613,473 priority patent/US7722321B2/en
Publication of EP1801357A1 publication Critical patent/EP1801357A1/en
Application granted granted Critical
Publication of EP1801357B1 publication Critical patent/EP1801357B1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D9/00—Stators
    • F01D9/02—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles
    • F01D9/04—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles forming ring or sector
    • F01D9/042—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles forming ring or sector fixing blades to stators

Definitions

  • the invention relates to the field of turbomachines comprising a stator vane.
  • a turbomachine whether it be a compressor, a turbine, or any other engine such as a turbojet, comprises at least one stator vane.
  • statoric vane means a set of vanes mounted in a ring on an outer ring and / or an inner shell.
  • vanes of certain axial stator vanes are oriented differently according to their angular position, in order to adapt the flow that they guide to the aerodynamic constraints of the engine.
  • each blade inserted in a bore of the inner ferrule, has an external platform, which is slid into a circumferential groove of the outer ferrule and fixed thereto by rivets.
  • the external platforms may have chamfers or notches allowing them to interlock with each other.
  • the blades comprise an external platform, having external bosses for receiving a screw; the platforms are contiguous to each other, thus delimiting the corresponding portion of the stream vein, and are fixed to the stator by screws inserted into the bosses.
  • Such blades have the disadvantage of the difficulty of their assembly, because the platforms of the blades, defining the vein of the flow, must be perfectly contiguous. Moreover, in the case where the orientation of the blades differs according to their angular position, this assembly is all the more difficult because it is necessary to provide blades of different shapes and / or whose platforms are different, which must be mounted successively, in the right order.
  • the present invention aims to provide a stator vane, for which the assembly of the blades is both simple and accurate.
  • the turbomachine stator vane comprises a ring of fixed vanes, mounted on a ferrule, each vane comprising a platform intended to be fixed to the ferrule, characterized in that the ferrule comprises a plurality of individual housings for the platforms, machined in the thickness of the ferrule, the shape of each housing being complementary to that of the corresponding platform.
  • each blade is placed in the vane by insertion of its platform into a housing of complementary shape.
  • the assembly is thus very simple to implement, without risk of error.
  • the housings being obtained by machining, one is protected from any human error, since the precision of the mounting of the vane is guaranteed by the precision of the machines used for the formation of the housing and the platforms, independently of the editing operation itself.
  • it is the ferrule, and of course the platforms, which delimits the corresponding portion of the flow vein: the tightness of the assembly is ensured, its rigidity being also increased.
  • the housings allow both the positioning and the orientation of the vanes within the vane.
  • all the blades are identical and their orientation in the blading is determined by the orientation of each housing.
  • each housing is provided on the ferrule according to the desired orientation for the dawn of which it houses the platform.
  • the mounting of such a blade is extremely simple, since only one type of blade is used.
  • the individual dwellings are flat bottom recesses.
  • the platforms of the blades comprise a threaded rod, arranged to be inserted into a bore opening on the bottom surface of the corresponding recess and bolted to the ferrule.
  • the advantage of such an embodiment is that it is not necessary that the platforms are of a large thickness, or have bosses, to allow the insertion within them of screws reported from the outside the ferrule. This increases the thickness of the platforms and therefore in size and weight of the part of the turbine engine comprising the blade.
  • the platforms comprise a portion of surface recessed around the threaded rod, which imposes a uniform contact on the outer edges of the platform and not around the threaded rod; friction or friction corrosion (usually referred to as “fretting corrosion”) is thereby greatly diminished.
  • the recessed surface portion is circular in shape. Such a portion can be obtained by turning the platforms, involving a low manufacturing cost and good machining accuracy.
  • the blades are monobloc with their platform. It follows a greater simplicity of manufacture and a better rigidity of the blades.
  • the attachment of the blades on the opposite side to the shell is, in the context of the invention, any.
  • the precision of the mounting side of the shell allows the use of any means of positioning and fixing the other side: platforms inserted into a groove, insertion holes of the end of the blades, platforms housed in housings similar to those of the shell, end of the blades in suspension, & c.
  • the invention also applies to blade structures in which the blades are different from each other but their platforms are all identical, easy to mount in their respective housing.
  • the platforms can also be different and it is then easy to determine the position of each blade according to the shape of the housing corresponding to its platform; we get somehow a foolproof platforms by housing.
  • the invention also relates to a turbomachine comprising a stator vane as described above.
  • the invention also relates to a blade for a turbomachine, comprising a blade body, supporting a platform with a threaded rod projecting from its surface, characterized in that the platform is in the form of a plate , of substantially constant thickness.
  • the stator axial vane 1 of the invention comprises a ferrule 2, in this case an outer ferrule, and vanes 3, fixedly mounted on ferrule 2.
  • axial vane is meant a blading extending to a flow of axially flowing gas, whose blades extend substantially perpendicular to the flow direction of the flow.
  • bolts are usually referred to as blades.
  • the stator vane 1 is a rectifying vane located in the low-pressure compressor of a turbojet engine.
  • the ferrule 2 comprises a wall 5 of revolution, here of substantially cylindrical shape, of support blades 3.
  • Each blade 3 comprises, here on the outer side of its blade body 3 ', a platform 6, in known manner.
  • the platforms 6 are preferably formed in one piece with the blades 3. Their shape is in this case relatively simple, in a rectangle with the rounded corners. All platforms 6 are preferably identical.
  • the ferrule 2 comprises a plurality of individual housings 7 for the platforms 6 of the blades 3.
  • Each housing 7 is intended to house a platform 6. It is of complementary shape to that of this platform 6.
  • the housings 7 are machined in the thickness of the wall 5 of the ferrule 2, here on its internal side.
  • the housings 7 comprise an upstream edge 7a, a downstream edge 7b and two lateral edges 7c. It is the orientation of the lateral edges 7c with respect to the axis of the turbojet engine which gives their orientation to the blades 3.
  • the lateral edges 7c of two adjacent housings 7 are distinct. In other words, the housings 7 do not have common edges and, between each housing 7, extends a surface portion of the ferrule 2. The sealing of a housing to the other is ensured by the shell 2 it -and not by the platforms 6 of the blades 3.
  • the housings 7 are in the form of recesses 7 with a flat bottom 7 '.
  • the recesses 7 comprise a circumferential wall of the shape of the platforms 6, that is to say here rectangular with rounded angles, and height, from the flat bottom 7 ', equal to the thickness of the platforms 6.
  • the platforms 6 are in the form of a plate, of substantially constant thickness; it is therefore flat platforms 6.
  • the platforms 6 comprise, projecting from their outer surface and in the central part thereof, a threaded rod 8 intended to extend within a bore 9, formed in the wall 5 of the ferrule 2 and opening into the flat bottom 7 'of the corresponding housing 7.
  • a nut 10 is screwed onto the rod 8, here on the outer side of the shell 2, the attachment of the blade 3 on the outer shell 2 is thus provided by bolting.
  • the positioning and orientation of the blades 3 are ensured by the position and the orientation of the recesses 7. It is thus possible, in the case of a blade whose blades 3 are not oriented in the same way according to their angular position. in the crown they form, that all the blades 3 are identical, their orientation being simply determined by the orientation of the recesses 7 which house them. It is the recesses 7 which provide the orientation function of the blades 3.
  • a blade 3 When a blade 3 is inserted into a housing 7, its threaded rod 8 is first inserted into a bore 9, then the dawn 3 sets naturally in place, by supporting the walls of its platform 6 on the walls of the recess 7 corresponding.
  • the vane formed is both rigid and watertight. Indeed, the gas stream is delimited, on the corresponding part, by the shell 2, with the platforms 6 inserted in the housing 7. Moreover, the rigidity and strength of the assembly of each blade 3 are independent of those other blades, since the mounting and fixing of each blade 3 are independent of those of the other blades 3.
  • the blades may be different from each other - depending on their orientation in the crown - the platforms are all identical. It follows a relative simplicity of assembly.
  • the blades can be different as well as the platforms, which implies that the recesses perform a keying function, since each type of recess can accommodate only one type of platform.
  • the blades 3 are mounted in the blade 1 with great precision, since it only depends on the precision of the machining of the recesses 7 and the platforms 6 of the blades 3 and no human factors related to the quality of the editing operation itself.
  • the platforms 6 of the blades 3 comprise a surface portion 11 recessed or hollowed around the threaded rod 8.
  • the effect of the presence of such a portion 11 is that the contacts between the platform 6 and the flat bottom 7 'are not made on this surface portion 11, which is the area most subject to friction, but only outside this portion 11.
  • this surface portion 11 extends to the side edges of the platform 6, only the end portions of the platform 6, on each side of the excavated surface portion 11, being in contact with the flat bottom 7 '.
  • Other configurations are possible, in particular smaller excavated surface portions 11, limited to the proximity of the threaded rod 8, the contact surface with the flat bottom 7 'then being a circumferential band on the platform 6. note that the depth of the recessed area portion 11 is not to scale; she is actually here much weaker.
  • the recessed area portion 11 is circular in shape.
  • Such a portion 11 is preferably obtained by turning the platform 6. This machining process has the double advantage, on the one hand of the low cost of implementation, on the other hand its high accuracy .

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

Abstract

The stator blade assembly consists of a series of blades (3) with platforms (6) fitted into individual recesses (7) in the stator ring (2). Each recess has a flat base that matches the shape of a blade platform and a central hole to receive a threaded rod (8) projecting from the underside of the platform for fixing the blade in place with a nut (10). The blades and platforms are made in one piece, with the recesses positioned for correct blade alignment.

Description

L'invention concerne le domaine des turbomachines comprenant un aubage statorique.The invention relates to the field of turbomachines comprising a stator vane.

Une turbomachine, qu'il s'agisse d'un compresseur, d'une turbine, ou tout autre moteur tel un turboréacteur, comporte au moins un aubage statorique. Par aubage statorique, on entend un ensemble d'aubes fixes montées en une couronne sur une virole externe et/ou une virole interne. A titre d'exemple, on peut citer les aubages redresseurs du flux dans les compresseurs ou les turbines, généralement disposés entre deux étages d'aubes mobiles, ou encore les aubages redresseurs du flux placés juste en aval de la soufflante dans les turboréacteurs à double flux.A turbomachine, whether it be a compressor, a turbine, or any other engine such as a turbojet, comprises at least one stator vane. By statoric vane means a set of vanes mounted in a ring on an outer ring and / or an inner shell. By way of example, mention may be made of the flow-straightening vanes in the compressors or the turbines, generally arranged between two stages of moving blades, or the flow-straightening vanes placed just downstream of the fan in the double turbojets. flux.

Les aubes de certains aubages statoriques axiaux sont orientées différemment en fonction de leur position angulaire, afin d'adapter le flux qu'elles guident aux contraintes aérodynamiques du moteur.The vanes of certain axial stator vanes are oriented differently according to their angular position, in order to adapt the flow that they guide to the aerodynamic constraints of the engine.

On connaît diverses formes de fixation des aubes sur la virole externe de l'aubage. Dans le document EP 0, 953, 729 , chaque aube, insérée dans un alésage de la virole interne, comporte une plate-forme externe, qui est glissée dans une rainure circonférentielle de la virole externe et fixée à cette dernière par des rivets. Les plates-formes externes peuvent comporter des chanfreins ou des encoches permettant leur emboîtement les unes avec les autres. Dans le document US 6, 371, 725 , les aubes comportent une plate-forme externe, comportant des bossages externes de réception d'une vis ; les plates-formes sont accolées les unes aux autres, délimitant ainsi la portion correspondante de la veine du flux, et sont fixées au stator par des vis insérées dans les bossages. On connaît également diverses formes de systèmes de fixation des aubes par les documents US 2 755 064 A , GB 1 208 507 A , US 4 940 386 A , US 4 832 568 A , US 4 594 761 A , FR 2321 616A , GB960812A , GB 599391 A , US 3 511 1 577 A , JP 59 180006 A , GB 790 280 A , DE 12 00 070 B , EP 0 353 498 A . On connaît plus particulièrement le document US 3 112 916 A concernant un système de fixation d'aubes de stator dans une turbomachine de manière à éviter un défaut d'alignement ou de positionnement.Various forms of blade attachment are known on the outer shell of the blade. In the document EP 0, 953, 729 each blade, inserted in a bore of the inner ferrule, has an external platform, which is slid into a circumferential groove of the outer ferrule and fixed thereto by rivets. The external platforms may have chamfers or notches allowing them to interlock with each other. In the document US 6,371,725 , the blades comprise an external platform, having external bosses for receiving a screw; the platforms are contiguous to each other, thus delimiting the corresponding portion of the stream vein, and are fixed to the stator by screws inserted into the bosses. Various forms of blade attachment systems are also known from the documents US 2,755,064 A , GB 1 208 507 A , US 4,940,386 A , US 4,832,568 A , US 4,594,761A , FR 2321 616A , GB960812A , GB 599391 A , US 3,511 1,577 A , JP 59 180006 A , GB 790 280 A , DE 12 00 070 B , EP 0 353 498 A . The document is more particularly known US 3,112,916A relating to a stator vane fixing system in a turbomachine so as to avoid misalignment or positioning.

De tels aubages présentent l'inconvénient de la difficulté de leur montage, car les plates-formes des aubes, délimitant la veine du flux, doivent être parfaitement jointives. Par ailleurs, dans le cas où l'orientation des aubes diffère en fonction de leur position angulaire, ce montage est d'autant plus difficile qu'il faut alors prévoir des aubes de formes différentes et/ou dont les plates-formes sont différentes, qui doivent être montées successivement, dans le bon ordre.Such blades have the disadvantage of the difficulty of their assembly, because the platforms of the blades, defining the vein of the flow, must be perfectly contiguous. Moreover, in the case where the orientation of the blades differs according to their angular position, this assembly is all the more difficult because it is necessary to provide blades of different shapes and / or whose platforms are different, which must be mounted successively, in the right order.

La présente invention vise à proposer un aubage statorique, pour lequel le montage des aubes est à la fois simple et précis.The present invention aims to provide a stator vane, for which the assembly of the blades is both simple and accurate.

Conformément à l'invention, qui est définie dans les revendications adjointes 1 et 7 respectivement, l'aubage statorique de turbomachine comporte une couronne d'aubes fixes, montées sur une virole, chaque aube comportant une plate-forme destinée à être fixée à la virole, caractérisé par le fait que la virole comporte une pluralité de logements individuels pour les plates-formes, usinés dans l'épaisseur de la virole, la forme de chaque logement étant complémentaire de celle de la plate-forme correspondante.According to the invention, which is defined in the accompanying claims 1 and 7 respectively, the turbomachine stator vane comprises a ring of fixed vanes, mounted on a ferrule, each vane comprising a platform intended to be fixed to the ferrule, characterized in that the ferrule comprises a plurality of individual housings for the platforms, machined in the thickness of the ferrule, the shape of each housing being complementary to that of the corresponding platform.

Grâce à l'invention, chaque aube est placée dans l'aubage par insertion de sa plate-forme dans un logement de forme complémentaire. Le montage est ainsi très simple à mettre en oeuvre, sans risque d'erreur. Les logements étant obtenus par usinage, on est à l'abri de toute erreur humaine, puisque la précision du montage de l'aubage est garantie par la précision des machines employées pour la formation des logements et des plates-formes, indépendamment de l'opération de montage elle-même. Par ailleurs, c'est la virole, ainsi bien sûr que les plates-formes, qui délimite la portion correspondante de la veine de flux : l'étanchéité de l'ensemble est donc assurée, sa rigidité étant par ailleurs augmentée.Thanks to the invention, each blade is placed in the vane by insertion of its platform into a housing of complementary shape. The assembly is thus very simple to implement, without risk of error. The housings being obtained by machining, one is protected from any human error, since the precision of the mounting of the vane is guaranteed by the precision of the machines used for the formation of the housing and the platforms, independently of the editing operation itself. Moreover, it is the ferrule, and of course the platforms, which delimits the corresponding portion of the flow vein: the tightness of the assembly is ensured, its rigidity being also increased.

Dans le cas où les aubes sont orientées différemment les unes des autres en fonction de leur position angulaire dans l'aubage, les logements permettent à la fois le positionnement et l'orientation des aubes au sein de l'aubage.In the case where the vanes are oriented differently from one another according to their angular position in the vane, the housings allow both the positioning and the orientation of the vanes within the vane.

Selon une forme de réalisation très avantageuse, toutes les aubes sont identiques et leur orientation dans l'aubage est déterminée par l'orientation de chaque logement. Ainsi, chaque logement est ménagé sur la virole selon l'orientation désirée pour l'aube dont il loge la plate-forme. Dans une telle forme de réalisation, on obtient, avec des aubes identiques, un aubage à aubes d'orientation différente selon la position autour de l'axe du moteur, simplement grâce à l'orientation donnée aux logements. Le montage d'un tel aubage est extrêmement simple, dans la mesure où un seul type d'aubes est utilisé.According to a very advantageous embodiment, all the blades are identical and their orientation in the blading is determined by the orientation of each housing. Thus, each housing is provided on the ferrule according to the desired orientation for the dawn of which it houses the platform. In such an embodiment, one obtains, with identical blades, a blade vane with different orientation depending on the position around the axis of the motor, simply thanks to the orientation given to the housing. The mounting of such a blade is extremely simple, since only one type of blade is used.

Les logements individuels sont des évidements à fond plat.The individual dwellings are flat bottom recesses.

Les plates-formes des aubes comportent une tige filetée, agencée pour être insérée dans un alésage débouchant sur la surface du fond de l'évidement correspondant et boulonnée à la virole. L'avantage d'une telle forme de réalisation est qu'il n'est pas nécessaire que les plates-formes soient d'une épaisseur importante, ou comportent des bossages, pour permettre l'insertion en leur sein de vis rapportées depuis l'extérieur de la virole. On gagne ainsi en épaisseur des plates-formes et par conséquent en dimensions et en poids de la partie de la turbomachine comportant l'aubage.The platforms of the blades comprise a threaded rod, arranged to be inserted into a bore opening on the bottom surface of the corresponding recess and bolted to the ferrule. The advantage of such an embodiment is that it is not necessary that the platforms are of a large thickness, or have bosses, to allow the insertion within them of screws reported from the outside the ferrule. This increases the thickness of the platforms and therefore in size and weight of the part of the turbine engine comprising the blade.

Les plates-formes comportent une portion de surface évidée autour de la tige filetée, ce qui impose un contact uniforme sur les bords extérieurs de la plate-forme et non autour de la tige filetée ; la corrosion par frottement ou friction (habituellement désignée par sa dénomination anglaise "fretting corrosion") est de ce fait grandement diminuée.The platforms comprise a portion of surface recessed around the threaded rod, which imposes a uniform contact on the outer edges of the platform and not around the threaded rod; friction or friction corrosion (usually referred to as "fretting corrosion") is thereby greatly diminished.

Avantageusement dans ce cas, la portion de surface évidée est de forme circulaire. Une telle portion peut être obtenue par tournage des plates-formes, impliquant un faible coût de fabrication et une bonne précision de l'usinage.Advantageously in this case, the recessed surface portion is circular in shape. Such a portion can be obtained by turning the platforms, involving a low manufacturing cost and good machining accuracy.

Avantageusement, les aubes sont monobloc avec leur plate-forme. Il s'ensuit une plus grande simplicité de fabrication et une meilleure rigidité des aubes.Advantageously, the blades are monobloc with their platform. It follows a greater simplicity of manufacture and a better rigidity of the blades.

On note que la fixation des aubes du côté opposé à la virole est, dans le cadre de l'invention, quelconque. La précision du montage du côté de la virole autorise l'emploi de tout moyen de positionnement et de fixation de l'autre côté : plates-formes insérées dans une rainure, alésages d'insertion de l'extrémité des aubes, plates-formes logées dans des logements semblable s à ceux de la virole, extrémité des aubes en suspension, etc.It is noted that the attachment of the blades on the opposite side to the shell is, in the context of the invention, any. The precision of the mounting side of the shell allows the use of any means of positioning and fixing the other side: platforms inserted into a groove, insertion holes of the end of the blades, platforms housed in housings similar to those of the shell, end of the blades in suspension, & c.

On note que l'invention s'applique également à des structures d'aubages dans lesquelles les aubes sont différentes les unes des autres mais leurs plates-formes sont toutes identiques, faciles à monter dans leurs logements respectifs. Les plates-formes peuvent également être différentes et il est alors aisé de déterminer la position de chaque aube en fonction de la forme du logement correspondant à sa plate-forme ; on obtient en quelque sorte un détrompage des plates-formes par les logements.Note that the invention also applies to blade structures in which the blades are different from each other but their platforms are all identical, easy to mount in their respective housing. The platforms can also be different and it is then easy to determine the position of each blade according to the shape of the housing corresponding to its platform; we get somehow a foolproof platforms by housing.

L'invention concerne également une turbomachine comportant un aubage statorique tel que décrit ci-dessus.The invention also relates to a turbomachine comprising a stator vane as described above.

L'invention concerne encore une aube pour turbomachine, comportant un corps d'aube, supportant une plate-forme avec une tige filetée en saillie de sa surface, caractérisée par le fait que la plate-forme se présente sous la forme d'une plaque, d'épaisseur sensiblement constante.The invention also relates to a blade for a turbomachine, comprising a blade body, supporting a platform with a threaded rod projecting from its surface, characterized in that the platform is in the form of a plate , of substantially constant thickness.

L'invention sera mieux comprise à l'aide de la description suivante de la forme de réalisation préférée de l'aubage de l'invention, en référence à la planche de dessins annexée, sur laquelle :

  • la figure 1 représente une vue schématique partielle en perspective, vue du côté interne, de la virole externe de la forme de réalisation préférée de l'aubage statorique de l'invention, sans les aubes ;
  • la figure 2 représente une vue schématique partielle en perspective, vue du côté interne, de la forme de réalisation préférée de l'aubage statorique de l'invention et
  • la figure 3 représente une vue schématique en perspective, vue du côté externe, de la plate-forme externe d'une aube de la forme de réalisation préférée de l'aubage de l'invention.
The invention will be better understood with the aid of the following description of the preferred embodiment of the blade of the invention, with reference to the attached drawing plate, in which:
  • the figure 1 represents a partial schematic view in perspective, seen from the inside, of the outer shell of the preferred embodiment of the stator vane of the invention, without the blades;
  • the figure 2 represents a partial schematic view in perspective, seen from the internal side, of the preferred embodiment of the stator vane of the invention and
  • the figure 3 is a schematic perspective view, seen from the outer side, of the outer platform of a blade of the preferred embodiment of the blade of the invention.

En référence aux figures 1 et 2, l'aubage axial statorique 1 de l'invention comporte une virole 2, en l'espèce une virole externe, et des aubes 3, montées de manière fixe sur la virole 2. Par aubage axial, on entend un aubage s'étendant au sein d'un flux de gaz s'écoulant axialement, dont les aubes s'étendent sensiblement perpendiculairement à la direction d'écoulement du flux. On parle généralement, s'agissant d'aubes fixes, d'aubes boulonnées. En l'espèce, l'aubage statorique 1 est un aubage redresseur situé dans le compresseur basse pression d'un turboréacteur. On voit, sur les figures 1 et 2, la zone 4 de matériau abradable, située en amont des aubes 3 de redresseur, avec laquelle les aubes mobiles de l'étage rotorique précédent du compresseur sont destinées à affleurer. On rappelle que l'invention s'applique plus généralement à tout aubage statorique, comportant des aubes fixes montées sur une virole, généralement externe.With reference to Figures 1 and 2 , the stator axial vane 1 of the invention comprises a ferrule 2, in this case an outer ferrule, and vanes 3, fixedly mounted on ferrule 2. By axial vane, is meant a blading extending to a flow of axially flowing gas, whose blades extend substantially perpendicular to the flow direction of the flow. In the case of fixed vanes, bolts are usually referred to as blades. In this case, the stator vane 1 is a rectifying vane located in the low-pressure compressor of a turbojet engine. We see, on Figures 1 and 2 zone 4 of abradable material, situated upstream of the stator vanes 3, with which the vanes of the preceding rotor stage of the compressor are intended to be flush with. It will be recalled that the invention applies more generally to any statoric blade, comprising fixed blades mounted on a ferrule, generally external.

La virole 2 comporte une paroi 5 de révolution, ici de forme sensiblement cylindrique, de support des aubes 3. Chaque aube 3 comporte, ici du côté externe de son corps d'aube 3', une plate-forme 6, de manière connue. Les plates-formes 6 sont de préférence formées d'une seule pièce avec les aubes 3. Leur forme est en l'espèce relativement simple, en rectangle avec les angles arrondis. Toutes les plates-formes 6 sont de préférence identiques.The ferrule 2 comprises a wall 5 of revolution, here of substantially cylindrical shape, of support blades 3. Each blade 3 comprises, here on the outer side of its blade body 3 ', a platform 6, in known manner. The platforms 6 are preferably formed in one piece with the blades 3. Their shape is in this case relatively simple, in a rectangle with the rounded corners. All platforms 6 are preferably identical.

La virole 2 comporte une pluralité de logements individuels 7 pour les plates-formes 6 des aubes 3. Chaque logement 7 est destiné à loger une plate-forme 6. Il est de forme complémentaire à celle de cette plate-forme 6. Les logements 7 sont usinés dans l'épaisseur de la paroi 5 de la virole 2, ici de son côté interne.The ferrule 2 comprises a plurality of individual housings 7 for the platforms 6 of the blades 3. Each housing 7 is intended to house a platform 6. It is of complementary shape to that of this platform 6. The housings 7 are machined in the thickness of the wall 5 of the ferrule 2, here on its internal side.

De façon générale, les logements 7 comportent un bord amont 7a , un bord aval 7b et deux bords latéraux 7c. C'est l'orientation des bords latéraux 7c par rapport à l'axe du turboréacteur qui donne leur orientation aux aubes 3. Les bords latéraux 7c de deux logements 7 voisins sont distincts. Autrement dit, les logements 7 ne comportent pas de bords communs et, entre chaque logement 7, s'étend une portion de surface de la virole 2. L'étanchéité d'un logement à l'autre est donc assurée par la virole 2 elle-même et non par les plates-formes 6 des aubes 3.In general, the housings 7 comprise an upstream edge 7a, a downstream edge 7b and two lateral edges 7c. It is the orientation of the lateral edges 7c with respect to the axis of the turbojet engine which gives their orientation to the blades 3. The lateral edges 7c of two adjacent housings 7 are distinct. In other words, the housings 7 do not have common edges and, between each housing 7, extends a surface portion of the ferrule 2. The sealing of a housing to the other is ensured by the shell 2 it -and not by the platforms 6 of the blades 3.

Selon une forme de réalisation préférée, les logements 7 se présentent sous la forme d'évidements 7 à fond plat 7'. Il s'agit de la structure la plus simple et la plus compacte. Les évidements 7 comportent une paroi circonférentielle de la forme des plates-formes 6, c'est-à-dire ici rectangulaire à angles arrondis, et de hauteur, à partir du fond plat 7', égale à l'épaisseur des plates-formes 6. Les plates-formes 6 se présentent sous la forme d'une plaque, d'épaisseur sensiblement constante ; il s'agit donc de plates-formes 6 plates.According to a preferred embodiment, the housings 7 are in the form of recesses 7 with a flat bottom 7 '. This is the simplest and most compact structure. The recesses 7 comprise a circumferential wall of the shape of the platforms 6, that is to say here rectangular with rounded angles, and height, from the flat bottom 7 ', equal to the thickness of the platforms 6. The platforms 6 are in the form of a plate, of substantially constant thickness; it is therefore flat platforms 6.

Selon la forme de réalisation préférée de l'invention, et en référence à la figure 3, les plates-formes 6 comportent, en saillie de leur surface externe et dans la partie centrale de cette dernière, une tige filetée 8, destinée à s'étendre au sein d'un alésage 9, formé dans la paroi 5 de la virole 2 et débouchant dans le fond plat 7' du logement 7 correspondant. Un écrou 10 est vissé sur la tige 8, ici du côté externe de la virole 2, la fixation de l'aube 3 sur la virole externe 2 étant ainsi assurée par boulonnage.According to the preferred embodiment of the invention, and with reference to the figure 3 , the platforms 6 comprise, projecting from their outer surface and in the central part thereof, a threaded rod 8 intended to extend within a bore 9, formed in the wall 5 of the ferrule 2 and opening into the flat bottom 7 'of the corresponding housing 7. A nut 10 is screwed onto the rod 8, here on the outer side of the shell 2, the attachment of the blade 3 on the outer shell 2 is thus provided by bolting.

La fixation des plates-formes 6 à la virole 2 étant assurée grâce aux tiges filetées 8 en saillie hors de la surface des plates-formes 6, boulonnées de l'autre côté de la paroi 5 de la virole 2 par les écrous 10, aucune surépaisseur de réception de vis rapportées de l'extérieur n'est ici nécessaire, ce qui autorise l'utilisation de plates-formes 6 et d'une virole 2 de relativement faible épaisseur.The fixing of the platforms 6 to the shell 2 being ensured thanks to the threaded rods 8 projecting out of the surface of the platforms 6, bolted on the other side of the wall 5 of the shell 2 by the nuts 10, no In this case, it is necessary to provide an extra thickness for receiving externally reported screws, which allows the use of platforms 6 and a ferrule 2 of relatively small thickness.

On pourrait comparer les évidements 7 à fond plat 7', percées en leur centre d'un alésage 9 de passage d'une tige filetée 8 solidaire de la plate-forme 6 à loger, à des lamages, de forme non pas circulaire mais complémentaire de celle de la plate-forme 6.One could compare the recesses 7 flat bottom 7 ', drilled at their center with a bore 9 for passage of a threaded rod 8 secured to the platform 6 to be housed, countersinks, not circular shape but complementary from that of the platform 6.

Le positionnement et l'orientation des aubes 3 sont assurés par la position et l'orientation des évidements 7. Il est ainsi possible, dans le cas d'un aubage dont les aubes 3 ne sont pas orientées de la même manière selon leur position angulaire dans la couronne qu'elles forment, que toutes les aubes 3 soient identiques, leur orientation étant simplement déterminée par l'orientation des évidements 7 qui les logent. Ce sont les évidements 7 qui assurent la fonction d'orientation des aubes 3. Lorsqu'une aube 3 est insérée dans un logement 7, sa tige filetée 8 est tout d'abord insérée dans un alésage 9, puis l'aube 3 se met naturellement en place, par appui des parois de sa plate-forme 6 sur les parois de l'évidement 7 correspondant.The positioning and orientation of the blades 3 are ensured by the position and the orientation of the recesses 7. It is thus possible, in the case of a blade whose blades 3 are not oriented in the same way according to their angular position. in the crown they form, that all the blades 3 are identical, their orientation being simply determined by the orientation of the recesses 7 which house them. It is the recesses 7 which provide the orientation function of the blades 3. When a blade 3 is inserted into a housing 7, its threaded rod 8 is first inserted into a bore 9, then the dawn 3 sets naturally in place, by supporting the walls of its platform 6 on the walls of the recess 7 corresponding.

L'aubage formé est à la fois rigide et étanche. En effet, la veine de gaz est délimitée, sur la partie correspondante, par la virole 2, avec les plates-formes 6 insérées dans les logements 7. Par ailleurs, la rigidité et la solidité du montage de chaque aube 3 sont indépendantes de celles des autres aubes, puisque le montage et la fixation de chaque aube 3 sont indépendants de ceux des autres aubes 3.The vane formed is both rigid and watertight. Indeed, the gas stream is delimited, on the corresponding part, by the shell 2, with the platforms 6 inserted in the housing 7. Moreover, the rigidity and strength of the assembly of each blade 3 are independent of those other blades, since the mounting and fixing of each blade 3 are independent of those of the other blades 3.

D'autres structures sont envisageables. Les aubes peuvent être différentes les unes des autres - en fonction de leur orientation dans la couronne - les plates-formes étant toutes identiques. Il s'ensuit une relative simplicité de montage. Les aubes peuvent être différentes ainsi que les plates-formes, ce qui implique que les évidements remplissent une fonction de détrompage, puisque chaque type d'évidement ne peut loger qu'un seul type de plate-forme.Other structures are possible. The blades may be different from each other - depending on their orientation in the crown - the platforms are all identical. It follows a relative simplicity of assembly. The blades can be different as well as the platforms, which implies that the recesses perform a keying function, since each type of recess can accommodate only one type of platform.

Dans tous les cas de figures, le montage des aubes 3 dans l'aubage 1 est assuré avec une grande précision, puisqu'il ne dépend que de la précision de l'usinage des évidements 7 et des plates-formes 6 des aubes 3 et non de facteurs humains liés à la qualité de l'opération de montage elle-même.In all cases, the blades 3 are mounted in the blade 1 with great precision, since it only depends on the precision of the machining of the recesses 7 and the platforms 6 of the blades 3 and no human factors related to the quality of the editing operation itself.

Dans le cadre d'un contact plan entre les plates-formes 6 et les fonds plats 7' des évidements 7, il existe un risque de corrosion par frottement ou friction, connu sous le terme anglais de "fretting corrosion". Afin de diminuer ce risque, les plates-formes 6 des aubes 3 comprennent une portion de surface 11 évidée, ou creusée, autour de la tige filetée 8. L'effet de la présence d'une telle portion 11 est que les contacts entre la plate-forme 6 et le fond plat 7' ne se font pas sur cette portion de surface 11, qui est la zone la plus soumise aux frictions, mais seulement en dehors de cette portion 11.In the context of a planar contact between the platforms 6 and the flat bottoms 7 'of the recesses 7, there is a risk of corrosion by friction or friction, known under the term of "fretting corrosion". To reduce this risk, the platforms 6 of the blades 3 comprise a surface portion 11 recessed or hollowed around the threaded rod 8. The effect of the presence of such a portion 11 is that the contacts between the platform 6 and the flat bottom 7 'are not made on this surface portion 11, which is the area most subject to friction, but only outside this portion 11.

On voit sur la figure 3 une forme de réalisation dans laquelle cette portion de surface 11 s'étend jusqu'aux bords latéraux de la plate-forme 6, seules les portions d'extrémités de la plate-forme 6, de chaque côté de la portion de surface creusée 11, étant en contact avec le fond plat 7'. D'autres configurations sont possibles, notamment des portions de surface creusées 11 moins étendues, limitées à la proximité de la tige filetée 8, la surface de contact avec le fond plat 7' étant alors une bande circonférentielle sur la plate-forme 6. On note que la profondeur de la portion de surface 11 évidée n'est pas à l'échelle ; elle est en réalité ici beaucoup plus faible.We see on the figure 3 an embodiment in which this surface portion 11 extends to the side edges of the platform 6, only the end portions of the platform 6, on each side of the excavated surface portion 11, being in contact with the flat bottom 7 '. Other configurations are possible, in particular smaller excavated surface portions 11, limited to the proximity of the threaded rod 8, the contact surface with the flat bottom 7 'then being a circumferential band on the platform 6. note that the depth of the recessed area portion 11 is not to scale; she is actually here much weaker.

Dans une forme de réalisation préférée, la portion de surface 11 évidée est de forme circulaire. Une telle portion 11 est de préférence obtenue par tournage de la plate-forme 6. Ce procédé d'usinage présente le double avantage, d'une part de la faiblesse de ses coûts de mise en oeuvre, d'autre part de sa grande précision.In a preferred embodiment, the recessed area portion 11 is circular in shape. Such a portion 11 is preferably obtained by turning the platform 6. This machining process has the double advantage, on the one hand of the low cost of implementation, on the other hand its high accuracy .

Claims (7)

  1. Turbo-engine stator blading comprising a crown of fixed blades (3) mounted on a ring (2), each blade (3) comprising a platform (6) intended to be fastened to the ring (2), the ring (2) comprising a plurality of individual receptacles (7) for the platforms (6), the said receptacles (7) being machined in the thickness of the ring (2), the form of each receptacle (7) being complementary to that of the corresponding platform (6), the individual receptacles (7) being recesses with a flat bottom (7') and the platforms (6) of the blades (3) comprising a threaded rod (8) which is designed to be inserted into a bore (9), issuing on the surface of the bottom (7') of the corresponding recess (7) and which is bolted to the ring (2), stator blading characterized in that the surfaces of the platforms (6) comprise a recessed surface portion (11) around the threaded rod (8).
  2. Stator blading according to Claim 1, in which the recessed surface portion (11) is of circular form, in particular obtained by the lathe-turning of the platform.
  3. Stator blading according to one of Claims 1 and 2, in which the blades (3) are in one piece with their platform (6).
  4. Stator blading according to one of Claims 1 to 3, in which, since the blades (3) are oriented differently from one another according to their angular position in the blading, the receptacles (7) ensure the positioning and orientation of the blades (3) within the blading.
  5. Stator blading according to Claim 4, in which all the blades are identical.
  6. Turbo-engine, comprising a stator blading according to one of Claims 1 to 5.
  7. Blade for a turbo-engine, comprising a blade body (3') supporting a platform (6) with a threaded rod projecting (8) from its surface, the platform (6) being intended to be fastened to an individual receptacle of a ring (2), the form of each receptacle (7) being complementary to that of the corresponding platform (6), the individual receptacles (7) being recesses with a flat bottom (7'), and the platform (6) is in the form of a plate of substantially constant thickness, the threaded rod (8) being designed to be inserted into a bore (9) issuing on the surface of the bottom (7') of the corresponding recess (7) and which is bolted to the ring (2), characterized in that the surface of the platform (6) comprises a recessed surface portion (11) around the threaded rod (8).
EP05112843A 2005-12-22 2005-12-22 Bladed nozzle of a turbomachine, turbomachine comprising this nozzle and turbomachine vane Active EP1801357B1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DE602005024425T DE602005024425D1 (en) 2005-12-22 2005-12-22 Bucket ring of a turbomachine, turbomachine with such a guide ring and vane
EP05112843A EP1801357B1 (en) 2005-12-22 2005-12-22 Bladed nozzle of a turbomachine, turbomachine comprising this nozzle and turbomachine vane
AT05112843T ATE486195T1 (en) 2005-12-22 2005-12-22 BLADE GUIDE RING OF A FLOW MACHINE, FLOW MACHINE WITH SUCH A GUIDE RING AND GUIDE VANE
US11/613,473 US7722321B2 (en) 2005-12-22 2006-12-20 Turbo-engine stator blading, turbo-engine comprising the blading and turbo-engine blade

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP05112843A EP1801357B1 (en) 2005-12-22 2005-12-22 Bladed nozzle of a turbomachine, turbomachine comprising this nozzle and turbomachine vane

Publications (2)

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EP1801357A1 EP1801357A1 (en) 2007-06-27
EP1801357B1 true EP1801357B1 (en) 2010-10-27

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EP (1) EP1801357B1 (en)
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US20070147993A1 (en) 2007-06-28
DE602005024425D1 (en) 2010-12-09
ATE486195T1 (en) 2010-11-15
EP1801357A1 (en) 2007-06-27
US7722321B2 (en) 2010-05-25

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