EP2058477B1 - Connection of radial struts to a circular casing by pins and spacers - Google Patents

Connection of radial struts to a circular casing by pins and spacers Download PDF

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Publication number
EP2058477B1
EP2058477B1 EP08168197.5A EP08168197A EP2058477B1 EP 2058477 B1 EP2058477 B1 EP 2058477B1 EP 08168197 A EP08168197 A EP 08168197A EP 2058477 B1 EP2058477 B1 EP 2058477B1
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EP
European Patent Office
Prior art keywords
sleeve
arm
arms
axis
arrangement
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EP08168197.5A
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German (de)
French (fr)
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EP2058477A1 (en
Inventor
Godefroy Francis Frédéric Drelon
Sébastien Jean Laurent Prestel
Jean-Luc Soupizon
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Safran Aircraft Engines SAS
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SNECMA SAS
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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
    • F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
    • F01D25/16—Arrangement of bearings; Supporting or mounting bearings in casings
    • F01D25/162—Bearing supports
    • 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
    • F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
    • F01D25/24—Casings; Casing parts, e.g. diaphragms, casing fastenings
    • F01D25/246—Fastening of diaphragms or stator-rings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2260/00—Function
    • F05B2260/30—Retaining components in desired mutual position
    • F05B2260/301—Retaining bolts or nuts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2230/00—Manufacture
    • F05D2230/60—Assembly methods
    • F05D2230/64—Assembly methods using positioning or alignment devices for aligning or centring, e.g. pins

Definitions

  • the subject of the invention is the connection of radial arms to a circular shell by axes and spacers, particularly in turbomachines used in aeronautics.
  • turbomachines comprise an outer shell concentric with a ferrule of an inner hub and joined to it by radial arms and delimiting an annular chamber or a portion of gas flow vein, also annular but open at its ends.
  • FIG 1 which partially and schematically represents a turbomachine conventionally comprising, between a stator 1 and a rotor 2, successively low pressure compressors 3 and high pressure 4, a combustion chamber 5, and high pressure turbines 6 and low pressure 7; the rotor 2 can be divided into two separate parts between the turbines 6 and 7, and an inner hub 8 extends between these two parts to maintain a smooth shape of a vein 9 of gas flow in the turbomachine.
  • the inner hub 8 is supported by substantially radial arms 10 which join its ferrule (inner circular) to a concentric outer shell 11 belonging to the stator 1 and which also delimits the gas flow vein 9 on the opposite outer side.
  • the arms 10 are profiles of simple section, generally rectangular. They are subjected to the high temperatures reached by the combustion gases, while influencing their flow. It is necessary to surround them fairing 12 separated from them by a sufficient clearance, to protect them somewhat from the heating and to provide a contour profile of good aerodynamic gas quality.
  • the figure 4 illustrates the assembly of the outer shell 11, the arms 10 and the inner hub in the isolated state, to give a clearer idea. The assembly flanges (not referenced) to stator 1 and rotor 2 appear therein.
  • the docking movement of the arms 10 to the assembly locations of the outer shell 11 is therefore difficult to achieve, as is the introduction of the tools required for assembly through the fairing fairing 12.
  • the connection between the arms 10 and the outer shell 11 must be designed to meet these constraints, but also to withstand the significant forces exerted on the arms in service and the significant warm-ups that they undergo despite fairings 12.
  • a classic montage illustrated at figure 2 , consists in making a hole at the end of each arm 10, to establish an ear 13 pierced on the outer shell 11, to place the arm 10 against the ear 13 so as to align its piercing with the piercing of the ear, and to pass a bolt 14 through the alignment of the holes and which serves as the axis of support; but the forces experienced by the arm 10 subject the parts of the assembly to greater efforts because of the cantilever assembly, and in particular the bolt is loaded flexion, which is disadvantageous and requires of course- dimensioning the connection parts, so as to withstand greater bending stresses than in the case of a symmetrical configuration with two ears.
  • the outer shell 11 is provided with two parallel lugs 15 and 16 between which the end of the arm 10 is placed and a bolt 17 is mounted through the bores of the arm 10 and the two lugs 15 and 16.
  • connection designs between the arms and the outer shell use intermediate parts, assembled both at the ferrule and the arms.
  • An example is in the document US 5,272,869 . They often have the drawbacks of having excessive dimensions to allow easy assembly and are usually bolted to the arms, with the risk of making disassembly of arms impossible if the bolts seize.
  • connection designs are described in the documents EP-A-1,482,130 , US-A-5,292,227 , US-A-5,180,282 and GB-A-2,272,027 .
  • the mounting of the connection is easy, even with reduced access whose fairing is responsible; the parts of the connection are simple, of small volume and not heavy; additional efforts due to overhangs or deformations in the assembly are avoided; the bolts are disjoint from the arm, in contact with less hot parts, and therefore less subject to heating and seizure; and the precise positioning of the arms on the ferrule is guaranteed.
  • the invention in a general form, relates to an arrangement comprising a circular ferrule, essentially radial arms joining the ferrule to another concentric ferrule, and connections of the arms to the ferrule or to the inner means, the connections each comprising at least one piercing traversing the arm parallel to the ferrule, an axis passing through each of said bores, characterized in that the shaft is provided with a pair of bores on either side of the arm, and the connections further comprise a pair of spacers disposed on either side of the arm between the axis and the ferrule, bores passing through the ferrule and the spacers and forming alignments with the bores of the axis, and bolts passing through the alignments of the bores and tightening the shell, axis and spacers.
  • the ferrule connected to the arm as indicated may be the outer shell 11, as is usual, but also the circular shell of the inner means 8: the arrangement would be the same except a few dimensional changes.
  • the arrangement further comprises a pair of axes for each of the connections, the axes of the pair being parallel, and four alignments of the aforesaid holes and bolts.
  • the arrangement includes locating pins in other drill alignments that extend into the arm, and either into the ferrule or into the axis or axes.
  • Another aspect of the invention is a turbomachine comprising the connection arrangement detailed above.
  • the assembly is represented at figure 5 , and its elements to Figures 6, 7, 8 and 9 .
  • the end of the arm 10 carries two parallel holes 20, established at its end through the smallest dimension and on two opposite sides ( Figures 5 and 8 ).
  • Axes 21 ( Figures 5 and 6 ) are engaged through the holes 20 while exceeding. They comprise a central portion 22 having the same section - preferably circular - that the holes 20 and housed in them and two lateral portions 23 projecting from the arm 10 and each traversed by an axis bore 24. The lateral portions 23 are provided with 25.
  • the arrangement further comprises spacers 26 ( Figures 5 and 7 ), traversed by a pair of spacer holes 27 parallel to each other.
  • the outer shell 11 is provided with a boss 28 ( Figures 5 and 9 ) associated with each of the connections and whose surface is flat or cylindrical, the cylinder admitting the same axis as the turbomachine. It is pierced by holes, including four outer holes 29 and two inner holes 30, through each boss 28.
  • the assembly is carried out by mounting the shrouds 12 (which are not shown in the last figures) around the arms 10 and introducing the assembly consisting of the inner hub 8, arms 10 and shrouds 12 in the outer shell 11 axial movement.
  • the setting in position is made when the inner holes 30 come in extension of holes 31 established in the ends of the arm 10 ( figure 8 ).
  • Positioning pieces 32 can then be introduced into these drill alignments 30 and 31 to maintain the arms 10 at a precise and fixed position.
  • the pins 21 are then introduced into the holes 20.
  • the spacers 26 are then introduced between the bosses 28 and the flats 25 of the pins 21 on either side of the arm 10, each of the spacers 26 in one of the protruding portions 23 of each At the positional adjustment, four alignments each comprising an outer bore 29 of the ferrule 11, a spacer bore 27 and an axle bore 24 were made.
  • the bolts 33 are finally threaded through them. aligning holes and tightened so as to compress the spacers 26 between the pins 21 and the outer shell 11.
  • positioning pins similar to 32 could extend into another bore of the axis 21 to retain the latter in place.
  • the symmetrical nature of the assembly reduces the forces applied, and above all to the arms 10. All the parts of the connection are placed at a short distance from the outer shell 11, which allows them to be mounted or adjusted without difficulty by the present game. between the outer shell 11 and the fairing 12.
  • the bolts 32 are easily accessible and can be mounted at will with the nut inside or outside the outer shell 11, according to the constraints of space or other qu 'we can meet.
  • the bolts 32 are disjoined arms 10, so that the disassembly of the connections should remain possible even in case of complications, such as nut seizures.
  • the axes 21 can be reduced to one by accepting a distribution a little less good efforts.
  • the sections of the central portion 22 and the holes 20 may be non-circular, although a circular shape is preferred since it is easier to manufacture while allowing a distribution of more regular and better defined efforts.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Connection Of Plates (AREA)
  • Mutual Connection Of Rods And Tubes (AREA)

Description

Le sujet de l'invention est le raccordement de bras radiaux à une virole circulaire par des axes et des entretoises, notamment dans les turbomachines employées dans l'aéronautique.The subject of the invention is the connection of radial arms to a circular shell by axes and spacers, particularly in turbomachines used in aeronautics.

Certains agencements de ces turbomachines comprennent une virole extérieure concentrique à une virole d'un moyeu intérieur et jointe à elle par des bras radiaux et délimitant une chambre annulaire ou une portion de veine d'écoulement des gaz, elle aussi annulaire mais ouverte à ses extrémités axiales. Un exemple apparaît à la figure 1, qui représente de façon partielle et schématique une turbomachine comprenant classiquement, entre un stator 1 et un rotor 2, successivement des compresseurs à basse pression 3 et haute pression 4, une chambre de combustion 5, et des turbines à haute pression 6 et basse pression 7 ; le rotor 2 peut se trouver divisé en deux parties séparées entre les turbines 6 et 7, et un moyeu intérieur 8 s'étend entre ces deux parties pour maintenir une forme lisse d'une veine 9 d'écoulement des gaz dans la turbomachine. Le moyeu intérieur 8 est soutenu par des bras 10 essentiellement radiaux qui joignent sa virole (circulaire intérieure) à une virole extérieure 11 concentrique appartenant au stator 1 et qui délimite aussi la veine 9 d'écoulement des gaz, du côté extérieur opposé. Les bras 10 sont des profilés de section simple, généralement rectangulaire. Ils sont soumis aux températures élevées atteintes par les gaz de combustion, tout en influant sur leur écoulement. Il est nécessaire de les entourer de carénages 12 séparés d'eux d'un jeu suffisant, pour les protéger quelque peu de l'échauffement et pour offrir un profil de contournement de bonne qualité aérodynamique aux gaz. La figure 4 illustre l'assemblage de la virole extérieure 11, des bras 10 et du moyeu intérieur à l'état isolé, afin d'en donner une idée plus nette. Les brides d'assemblage (non référencées) au stator 1 et au rotor 2 y apparaissent.Certain arrangements of these turbomachines comprise an outer shell concentric with a ferrule of an inner hub and joined to it by radial arms and delimiting an annular chamber or a portion of gas flow vein, also annular but open at its ends. axial. An example appears at the figure 1 , which partially and schematically represents a turbomachine conventionally comprising, between a stator 1 and a rotor 2, successively low pressure compressors 3 and high pressure 4, a combustion chamber 5, and high pressure turbines 6 and low pressure 7; the rotor 2 can be divided into two separate parts between the turbines 6 and 7, and an inner hub 8 extends between these two parts to maintain a smooth shape of a vein 9 of gas flow in the turbomachine. The inner hub 8 is supported by substantially radial arms 10 which join its ferrule (inner circular) to a concentric outer shell 11 belonging to the stator 1 and which also delimits the gas flow vein 9 on the opposite outer side. The arms 10 are profiles of simple section, generally rectangular. They are subjected to the high temperatures reached by the combustion gases, while influencing their flow. It is necessary to surround them fairing 12 separated from them by a sufficient clearance, to protect them somewhat from the heating and to provide a contour profile of good aerodynamic gas quality. The figure 4 illustrates the assembly of the outer shell 11, the arms 10 and the inner hub in the isolated state, to give a clearer idea. The assembly flanges (not referenced) to stator 1 and rotor 2 appear therein.

Des difficultés apparaissent pour faire l'assemblage des bras 10 à la virole extérieure 11, que les bras 10 soient d'une pièce avec le moyeu intérieur 8 ou aient été assemblés auparavant à lui, puisque les carénages 12, enfilés autour des bras 10, ne laissent que peu de jeu jusqu'à la virole extérieure 11.Difficulties arise to make the assembly of the arms 10 to the outer shell 11, that the arms 10 are integral with the inner hub 8 or have been previously assembled to it, since the fairings 12, threaded around the arms 10, leave little play until the outer shell 11.

Le mouvement d'accostage des bras 10 aux emplacements d'assemblage de la virole extérieure 11 est donc délicat à réaliser, de même que l'introduction des outils nécessaires à l'assemblage à travers le jeu des carénages 12. Le raccordement entre les bras 10 et la virole extérieure 11 doit être conçu pour satisfaire à ces contraintes, mais aussi pour tenir aux efforts importants exercés sur les bras en service et aux échauffements importants qu'ils subissent malgré les carénages 12.The docking movement of the arms 10 to the assembly locations of the outer shell 11 is therefore difficult to achieve, as is the introduction of the tools required for assembly through the fairing fairing 12. The connection between the arms 10 and the outer shell 11 must be designed to meet these constraints, but also to withstand the significant forces exerted on the arms in service and the significant warm-ups that they undergo despite fairings 12.

Un montage classique, illustré à la figure 2, consiste à réaliser un perçage à l'extrémité de chaque bras 10, à établir une oreille 13 percée sur la virole extérieure 11, à placer le bras 10 contre l'oreille 13 de façon à aligner son perçage avec le perçage de l'oreille, et à faire passer un boulon 14 à travers l'alignement des perçages et qui fait office d'axe de support ; mais les efforts subis par le bras 10 soumettent les pièces de l'assemblage à des efforts plus importants à cause du port-à-faux du montage, et notamment le boulon est chargé en flexion, ce qui est désavantageux et oblige à bien sur-dimensionner les pièces du raccordement, de façon à résister aux contraintes de flexion plus importantes que dans le cas d'une configuration symétrique à deux oreilles. C'est pourquoi, dans une autre conception, illustrée à la figures 3, la virole extérieure 11 est pourvue de deux oreilles parallèles 15 et 16 entre lesquelles l'extrémité du bras 10 est placée et un boulon 17 est monté en passant par les perçages du bras 10 et des deux oreilles 15 et 16. Les efforts de flexion sont alors réduits, et le raccordement peut être construit de façon plus légère, mais un dilemme apparaît alors : si les oreilles 15 et 16 sont écartées (ce qui peut être imposé par un montage qui nécessite une approche du bras 10 dans une direction non parallèle aux faces des oreilles 15 et 16) le montage est facile mais le boulon 17 subit un cisaillement, et une flexion importants (même si la flexion est moins importante grâce à la symétrie de la configuration) et le montage possède du jeu ; et rapprocher les oreilles 15 et 16 l'une de l'autre, lors du montage, en serrant le boulon 17, n'est pas avantageux car les contraintes internes deviennent excessives et le boulon 17 se grippera plus facilement ; si au contraire les oreilles 15 et 16 sont construites proches l'une de l'autre, le jeu avec l'extrémité du bras 10 devient faible ou même nul et la flexion du boulon 17 disparaît, mais il devient difficile d'introduire les bras 10 entre les oreilles 15 et 16, voire impossible si les bras 10 sont dirigés avec une inclinaison dans la direction angulaire de la machine, ce qui est très fréquent d'après le redressement d'écoulement des gaz qu'ils doivent exercer, car le montage doit s'effectuer alors selon un mouvement en hélice qui ne permet pas d'exercer des efforts nécessaires à l'introduction.A classic montage, illustrated at figure 2 , consists in making a hole at the end of each arm 10, to establish an ear 13 pierced on the outer shell 11, to place the arm 10 against the ear 13 so as to align its piercing with the piercing of the ear, and to pass a bolt 14 through the alignment of the holes and which serves as the axis of support; but the forces experienced by the arm 10 subject the parts of the assembly to greater efforts because of the cantilever assembly, and in particular the bolt is loaded flexion, which is disadvantageous and requires of course- dimensioning the connection parts, so as to withstand greater bending stresses than in the case of a symmetrical configuration with two ears. This is why, in another design, illustrated in the figures 3 , the outer shell 11 is provided with two parallel lugs 15 and 16 between which the end of the arm 10 is placed and a bolt 17 is mounted through the bores of the arm 10 and the two lugs 15 and 16. The bending forces are then reduced, and the connection can be constructed in a lighter way, but a dilemma then appears: if the lugs 15 and 16 are spaced apart (which can be imposed by an assembly which requires an approach of the arm 10 in a non-parallel direction at the faces of the lugs 15 and 16) the mounting is easy but the bolt 17 undergoes a large shear and bending (even if the bending is less important due to the symmetry of the configuration) and the assembly has play; and bringing the lugs 15 and 16 closer to each other, during assembly, by tightening the bolt 17, is not advantageous because the internal stresses become excessive and the bolt 17 will seize more easily; if on the contrary the ears 15 and 16 are built close to each other, the play with the end of the arm 10 becomes weak or even zero and the bending of the bolt 17 disappears, but it becomes difficult to introduce the arms 10 between the lugs 15 and 16, or even impossible if the arms 10 are directed with an inclination in the angular direction of the machine, which is very frequent according to the flow rectification of the gases they must exert, because the mounting must then be carried out in a propeller movement which does not make it possible to exert efforts necessary for the introduction.

D'autres conceptions de raccordement entre les bras et la virole extérieure font appel à des pièces intermédiaires, assemblées à la fois à la virole et aux bras. Un exemple est dans le document US 5 272 869 . Elles présentent souvent les inconvénients d'avoir des dimensions excessives pour permettre un montage aisé et sont généralement boulonnées aux bras, avec le risque de rendre le démontage des bras impossible si les boulons se grippent.Other connection designs between the arms and the outer shell use intermediate parts, assembled both at the ferrule and the arms. An example is in the document US 5,272,869 . They often have the drawbacks of having excessive dimensions to allow easy assembly and are usually bolted to the arms, with the risk of making disassembly of arms impossible if the bolts seize.

Ce dernier inconvénient subsiste dans d'autres raccordements, d'après lesquels les bras sont unis directement à la virole par des boulons traversant celle-ci et orientés parallèlement à la direction des bras. Un exemple est dans le document US 6 439 841 . Les vis peuvent être engagées dans des douilles taraudées serties dans des perçages du bras, ou engagées avec du jeu dans des perçages lisses du bras qui débouchent sur des ouvertures dans lesquelles on peut introduire et visser les écrous des boulons.This last disadvantage remains in other connections, according to which the arms are joined directly to the shell by bolts passing through it and oriented parallel to the direction of the arms. An example is in the document US 6,439,841 . The screws can be engaged in threaded bushings crimped into holes in the arm, or engaged with play in smooth drillings of the arm which open on openings into which bolts nuts can be inserted and screwed.

Des autres conceptions de raccordement sont décrites dans les documents EP-A-1 482 130 , US-A-5 292 227 , US-A-5 180 282 et GB-A-2 272 027 .Other connection designs are described in the documents EP-A-1,482,130 , US-A-5,292,227 , US-A-5,180,282 and GB-A-2,272,027 .

Les avantages obtenus par l'invention par rapport à ces différentes conceptions peuvent être explicités comme voici : le montage du raccordement est facile, même avec les accès réduits dont le carénage est responsable ; les pièces du raccordement sont simples, de petit volume et peu pesantes ; des efforts supplémentaires redevables à des porte-à-faux ou à des déformations au montage sont évités ; les boulons sont disjoints du bras, en contact avec des pièces moins chaudes, et donc moins sujets aux échauffements et aux grippages ; et la mise en position précise des bras sur la virole est garantie.The advantages obtained by the invention with respect to these different designs can be explained as follows: the mounting of the connection is easy, even with reduced access whose fairing is responsible; the parts of the connection are simple, of small volume and not heavy; additional efforts due to overhangs or deformations in the assembly are avoided; the bolts are disjoint from the arm, in contact with less hot parts, and therefore less subject to heating and seizure; and the precise positioning of the arms on the ferrule is guaranteed.

Sous une forme générale, l'invention concerne un agencement comprenant une virole circulaire, des bras essentiellement radiaux joignant la virole à une autre virole concentrique, et des raccordements des bras à la virole ou au moyen intérieur, les raccordements comprenant chacun au moins un perçage traversant le bras parallèlement à la virole, un axe traversant chacun desdits perçages, caractérisé en ce que l'axe est muni d'une paire de perçages de part et d'autre du bras, et les raccordements comprennent encore une paire d'entretoises disposées de part et d'autre du bras entre l'axe et la virole, des perçages traversant la virole et les entretoises et formant des alignements avec les perçages de l'axe, et des boulons traversant les alignements des perçages et serrant la virole, l'axe et les entretoises.In a general form, the invention relates to an arrangement comprising a circular ferrule, essentially radial arms joining the ferrule to another concentric ferrule, and connections of the arms to the ferrule or to the inner means, the connections each comprising at least one piercing traversing the arm parallel to the ferrule, an axis passing through each of said bores, characterized in that the shaft is provided with a pair of bores on either side of the arm, and the connections further comprise a pair of spacers disposed on either side of the arm between the axis and the ferrule, bores passing through the ferrule and the spacers and forming alignments with the bores of the axis, and bolts passing through the alignments of the bores and tightening the shell, axis and spacers.

Au sens de l'invention, la virole raccordée au bras de la façon indiquée peut être la virole extérieure 11, comme il est usuel, mais aussi la virole circulaire du moyen intérieur 8 : l'agencement serait le même hors quelques modifications de dimensions.Within the meaning of the invention, the ferrule connected to the arm as indicated may be the outer shell 11, as is usual, but also the circular shell of the inner means 8: the arrangement would be the same except a few dimensional changes.

Dans une réalisation préférée, l'agencement comprend encore une paire des axes pour chacun des raccordements, les axes de la paire étant parallèles, et quatre alignements des perçages susdits et des boulons susdits.In a preferred embodiment, the arrangement further comprises a pair of axes for each of the connections, the axes of the pair being parallel, and four alignments of the aforesaid holes and bolts.

Dans une autre forme de réalisation, l'agencement comprend des pions de mise en position dans d'autres alignements de perçage qui s'étendent dans le bras, et soit dans la virole soit dans l'axe ou les axes.In another embodiment, the arrangement includes locating pins in other drill alignments that extend into the arm, and either into the ferrule or into the axis or axes.

Un autre aspect de l'invention est une turbomachine comprenant l'agencement de raccordement détaillé ci-dessus.Another aspect of the invention is a turbomachine comprising the connection arrangement detailed above.

L'invention sera maintenant décrite en référence aux figures suivantes :

  • la figure 1 déjà décrite représente une turbomachine équipée de l'invention ;
  • les figures 2 et 3 déjà décrites représentent deux modes de réalisation ou d'assemblage conformes à l'art connu ;
  • la figure 4, déjà décrite, représente une vue complète de la virole et des bras une fois assemblés ;
  • et les figures 5, 6, 7, 8 et 9 représentent plus précisément l'invention.
The invention will now be described with reference to the following figures:
  • the figure 1 already described represents a turbine engine equipped with the invention;
  • the Figures 2 and 3 already described represent two embodiments or assembly according to the prior art;
  • the figure 4 , already described, represents a complete view of the ferrule and the arms once assembled;
  • and the Figures 5, 6, 7, 8 and 9 represent more precisely the invention.

L'assemblage est représenté à la figure 5, et ses éléments aux figures 6, 7, 8 et 9.The assembly is represented at figure 5 , and its elements to Figures 6, 7, 8 and 9 .

L'extrémité du bras 10 porte deux perçages 20 parallèles, établis à son extrémité à travers la plus petite dimension et de deux côtés opposés (figures 5 et 8). Des axes 21 (figures 5 et 6) sont engagés au travers des perçages 20 tout en en dépassant. Ils comprennent une portion centrale 22 ayant la même section - de préférence circulaire - que les perçages 20 et logée en eux et deux portions latérales 23 saillant du bras 10 et traversées chacune par un perçage d'axe 24. Les portions latérales 23 sont munies de méplats 25. L'agencement comprend encore des entretoises 26 (figures 5 et 7), traversées par une paire de perçages d'entretoise 27 parallèles entre eux.The end of the arm 10 carries two parallel holes 20, established at its end through the smallest dimension and on two opposite sides ( Figures 5 and 8 ). Axes 21 ( Figures 5 and 6 ) are engaged through the holes 20 while exceeding. They comprise a central portion 22 having the same section - preferably circular - that the holes 20 and housed in them and two lateral portions 23 projecting from the arm 10 and each traversed by an axis bore 24. The lateral portions 23 are provided with 25. The arrangement further comprises spacers 26 ( Figures 5 and 7 ), traversed by a pair of spacer holes 27 parallel to each other.

La virole extérieure 11 est munie d'un bossage 28 (figures 5 et 9) associé à chacun des raccordements et dont la surface est plane ou cylindrique, le cylindre admettant le même axe que la turbomachine. Elle est traversée par des perçages, dont quatre perçages extérieurs 29 et deux perçages intérieurs 30, à travers chaque bossage 28.The outer shell 11 is provided with a boss 28 ( Figures 5 and 9 ) associated with each of the connections and whose surface is flat or cylindrical, the cylinder admitting the same axis as the turbomachine. It is pierced by holes, including four outer holes 29 and two inner holes 30, through each boss 28.

L'assemblage s'effectue en montant les carénages 12 (qui ne sont pas représentés sur les dernières figures) autour des bras 10 et en introduisant l'assemblage composé du moyeu intérieur 8, des bras 10 et des carénages 12 dans la virole extérieure 11 d'un mouvement axial. La mise en position est faite quand les perçages intérieurs 30 viennent en prolongement de perçages 31 établis dans les extrémités du bras 10 (figure 8). Des pions de mise en position 32 peuvent alors être introduits dans ces alignements de perçage 30 et 31 pour maintenir les bras 10 à une position précise et fixe. Les axes 21 sont ensuite introduits dans les perçages 20. Les entretoises 26 sont ensuite introduites entre les bossages 28 et les méplats 25 des axes 21 de part et d'autre du bras 10, chacune des entretoises 26 sous une des portions saillantes 23 de chacun des axes 21. A l'ajustement de position, on a réalisé quatre alignements comprenant chacun un perçage extérieur 29 de la virole 11, un perçage d'entretoise 27 et un perçage d'axe 24. Des boulons 33 sont finalement enfilés à travers ces alignements de perçages et serrés de manière à comprimer les entretoises 26 entre les axes 21 et la virole extérieure 11. En variante, des pions de mise en position analogues à 32 pourraient s'étendre jusque dans un autre perçage de l'axe 21 pour retenir ce dernier en place.The assembly is carried out by mounting the shrouds 12 (which are not shown in the last figures) around the arms 10 and introducing the assembly consisting of the inner hub 8, arms 10 and shrouds 12 in the outer shell 11 axial movement. The setting in position is made when the inner holes 30 come in extension of holes 31 established in the ends of the arm 10 ( figure 8 ). Positioning pieces 32 can then be introduced into these drill alignments 30 and 31 to maintain the arms 10 at a precise and fixed position. The pins 21 are then introduced into the holes 20. The spacers 26 are then introduced between the bosses 28 and the flats 25 of the pins 21 on either side of the arm 10, each of the spacers 26 in one of the protruding portions 23 of each At the positional adjustment, four alignments each comprising an outer bore 29 of the ferrule 11, a spacer bore 27 and an axle bore 24 were made. The bolts 33 are finally threaded through them. aligning holes and tightened so as to compress the spacers 26 between the pins 21 and the outer shell 11. Alternatively, positioning pins similar to 32 could extend into another bore of the axis 21 to retain the latter in place.

Le caractère symétrique du montage réduit les efforts appliqués, et avant tout aux bras 10. Toutes les pièces du raccordement sont placées à peu de distance de la virole extérieure 11, ce qui permet de les monter ou de les ajuster sans difficulté par le jeu présent entre la virole extérieure 11 et le carénage 12. Les boulons 32 sont facilement accessibles et peuvent être montés à volonté avec l'écrou à l'intérieur ou à l'extérieur de la virole extérieure 11, selon les contraintes d'encombrement ou autres qu'on peut rencontrer. Les boulons 32 sont disjoints des bras 10, de sorte que le démontage des raccordements devrait rester possible même en cas de complications, telles que des grippages d'écrou. Les axes 21 peuvent être réduits à un seul en acceptant une répartition un peu moins bonne des efforts. Les sections de la portion centrale 22 et les perçages 20 peuvent être non circulaires, quoiqu'une forme circulaire soit préférée puisqu'elle est plus facile à fabriquer tout en permettant une répartition des efforts plus régulière et mieux définie.The symmetrical nature of the assembly reduces the forces applied, and above all to the arms 10. All the parts of the connection are placed at a short distance from the outer shell 11, which allows them to be mounted or adjusted without difficulty by the present game. between the outer shell 11 and the fairing 12. The bolts 32 are easily accessible and can be mounted at will with the nut inside or outside the outer shell 11, according to the constraints of space or other qu 'we can meet. The bolts 32 are disjoined arms 10, so that the disassembly of the connections should remain possible even in case of complications, such as nut seizures. The axes 21 can be reduced to one by accepting a distribution a little less good efforts. The sections of the central portion 22 and the holes 20 may be non-circular, although a circular shape is preferred since it is easier to manufacture while allowing a distribution of more regular and better defined efforts.

Claims (9)

  1. Arrangement comprising a circular sleeve (11), substantially radial arms (10) joining the sleeve (11) to another concentric sleeve (8), and connections of the arms to the sleeve, the connections each comprising at least one piercing (20) crossing the arm in parallel to the sleeve (11), an axis (21) crossing each of said piercings (20), characterised in that the axis is provided with a pair of piercings (24) on either side of the arm, and the connections further comprise a pair of spacers (26) arranged on either side of the arm (10) between the axis (21) and the sleeve (11), piercings (29, 27) crossing the sleeve and the spacers and forming alignments with the axis piercings (24), and bolts (33) crossing the alignments of the piercings and hugging the sleeve, the axis and the spacers.
  2. Arrangement set forth in claim 1, characterised in that it comprises a pair of axes (21) for each of the connections, the axes of the pair being parallel, and four alignments of the aforementioned piercings and aforementioned bolts.
  3. Arrangement as set forth in any of claims 1 or 2, characterised in that the piercing (20) of the arm and a central portion (22) of the axis (21), engaged in the arm piercing, are of circular section.
  4. Arrangement as set forth in any of claims 1 to 3, characterised in that it comprises pins (32) for positioning in other piercing alignments (30, 31), which extend in the arm (10) and the sleeve (11).
  5. Arrangement as set forth in any of claims 1 to 3, characterised in that it comprises positioning pins in other piercing alignments, which extend in the arm and the sleeve and the axis.
  6. Arrangement as set forth in any of claims 1 to 5, characterised in that the sleeve, which is substantially conical, comprises bosses (23) with a planar or cylindrical interior surface, the sleeve piercings (29, 30) crossing the bosses and the spacers (26) resting on the planar or cylindrical interior surface.
  7. Turbomachine, characterised in that it comprises an arrangement in accordance with any of the preceding claims.
  8. Turbomachine set forth in claim 7, characterised in that the arms (10) are surrounded with fairings (12).
  9. Turbomachine as set forth in any of claims 7 or 8, characterised in that the sleeve, an interior hub, which is the other sleeve (8), and the arms are present between a high-pressure turbine (6) and a low-pressure turbine (7), the arms (10) crossing a flow (9) of combustion gases.
EP08168197.5A 2007-11-09 2008-11-03 Connection of radial struts to a circular casing by pins and spacers Active EP2058477B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0758941A FR2923530B1 (en) 2007-11-09 2007-11-09 CONNECTION OF RADIAL ARMS TO A CIRCULAR VIROLE BY AXES AND SPACERS

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EP2058477A1 EP2058477A1 (en) 2009-05-13
EP2058477B1 true EP2058477B1 (en) 2013-08-07

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EP08168197.5A Active EP2058477B1 (en) 2007-11-09 2008-11-03 Connection of radial struts to a circular casing by pins and spacers

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US (1) US8142152B2 (en)
EP (1) EP2058477B1 (en)
JP (1) JP5058125B2 (en)
CN (1) CN101429876B (en)
CA (1) CA2643536C (en)
FR (1) FR2923530B1 (en)
RU (1) RU2494265C2 (en)

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US9816387B2 (en) 2014-09-09 2017-11-14 United Technologies Corporation Attachment faces for clamped turbine stator of a gas turbine engine
US10443447B2 (en) * 2016-03-14 2019-10-15 General Electric Company Doubler attachment system
AU2016277549B2 (en) * 2016-10-24 2018-10-18 Intex Holdings Pty Ltd A multi-stage axial flow turbine adapted to operate at low steam temperatures
FR3068383B1 (en) * 2017-06-28 2019-08-09 Safran Aircraft Engines CONNECTION OF RADIAL ARMS TO A CIRCULAR VIROLE BY ILLUMINATION OF REPORTED PARTS

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US4286921A (en) * 1979-12-13 1981-09-01 Westinghouse Electric Corp. Locking structure for an alignment bushing of a combustion turbine engine
SU1160066A1 (en) * 1983-12-27 1985-06-07 Selikhov Vyacheslav L Cooled bearing support of cantilever turbomachine
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Also Published As

Publication number Publication date
CN101429876A (en) 2009-05-13
JP2009121459A (en) 2009-06-04
CA2643536A1 (en) 2009-05-09
EP2058477A1 (en) 2009-05-13
US8142152B2 (en) 2012-03-27
CN101429876B (en) 2013-05-01
FR2923530B1 (en) 2014-04-04
US20090123279A1 (en) 2009-05-14
CA2643536C (en) 2015-06-02
FR2923530A1 (en) 2009-05-15
RU2494265C2 (en) 2013-09-27
JP5058125B2 (en) 2012-10-24
RU2008144229A (en) 2010-05-20

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