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EP3033495B1 - Improvement for the locking of blade-supporting components - Google Patents

Improvement for the locking of blade-supporting components Download PDF

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Publication number
EP3033495B1
EP3033495B1 EP14786954.9A EP14786954A EP3033495B1 EP 3033495 B1 EP3033495 B1 EP 3033495B1 EP 14786954 A EP14786954 A EP 14786954A EP 3033495 B1 EP3033495 B1 EP 3033495B1
Authority
EP
European Patent Office
Prior art keywords
parts
hook
assembly
crown
housing
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.)
Active
Application number
EP14786954.9A
Other languages
German (de)
French (fr)
Other versions
EP3033495A1 (en
Inventor
Patrice Jean-Marc Rosset
Coralie GUERARD
Hélène CONDAT
Sébatien PRESTEL
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
Safran Aircraft Engines SAS
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Safran Aircraft Engines SAS filed Critical Safran Aircraft Engines SAS
Publication of EP3033495A1 publication Critical patent/EP3033495A1/en
Application granted granted Critical
Publication of EP3033495B1 publication Critical patent/EP3033495B1/en
Active legal-status Critical Current
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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
    • 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
    • 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
    • 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
    • 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
    • F05D2220/00—Application
    • F05D2220/30—Application in turbines
    • F05D2220/32—Application in turbines in gas turbines
    • 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
    • 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
    • F05D2240/00—Components
    • F05D2240/10—Stators
    • F05D2240/12—Fluid guiding means, e.g. vanes
    • F05D2240/128—Nozzles
    • 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
    • F05D2240/00—Components
    • F05D2240/80—Platforms for stationary or moving blades
    • 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
    • F05D2260/00—Function
    • F05D2260/30—Retaining components in desired mutual position
    • 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
    • F05D2260/00—Function
    • F05D2260/30—Retaining components in desired mutual position
    • F05D2260/36—Retaining components in desired mutual position by a form fit connection, e.g. by interlocking

Definitions

  • the invention relates to an assembly for locking in relative translation two turbomachine blade support parts such as for example a fixed blade platform and a vane support ring or a mobile blade ring and a ring case.
  • the invention applies in particular to the locking of a turbomachine flow distribution vanes platform to a support ring of said distribution vane, as is known from the document EP 0 967 364 .
  • FIG. 5 An example of a turbomachine has been illustrated in figure 5 .
  • a turbomachine 1 typically comprises a nacelle which forms an opening for the admission of a given flow of air to the engine itself.
  • the turbomachine comprises one or more compression sections 3 of the air admitted into the engine (generally a low pressure section and a high pressure section). The air thus compressed is admitted into the combustion chamber 5 and mixed with fuel before being burned.
  • the hot combustion gases from this combustion are then expanded in different turbine stages.
  • a first expansion is made in a high pressure stage 6 immediately downstream of the combustion chamber and which receives gas at the highest temperature.
  • the gases are expanded again by being guided through so-called low pressure turbine stages 7.
  • a turbine, high pressure 6 or low pressure 7 conventionally comprises one or more stages, each consisting of a row of stationary turbine blades, also called distributor, followed by a row of turbine blades, which form the rotor.
  • the dispensers are fixed together via a ring.
  • Dispenser 2 deflects the gas stream drawn at the combustion chamber to the turbine blades at a suitable angle and speed to drive these rotating blades and the rotor of the turbine in rotation.
  • Each distributor is sectorized, that is to say formed of several distributor sectors arranged circumferentially end to end about a longitudinal axis XX of the turbomachine.
  • Each distributor sector comprises a plurality of blades extending radially relative to the axis XX of the turbomachine so as to connect a radially inner annular element (or internal platform) and a radially outer annular element (or external platform), which together form an annular vein facing the blades of the turbine.
  • a support ring of the distributor On the external platform of the distributor is mounted a support ring of the distributor, which is a part of revolution around the axis of the turbomachine.
  • the ring and the distributor must be integral with each other.
  • means for blocking a relative translation in the axial or radial direction (relative to the axis of the turbomachine) must be provided.
  • the locks are in the form of crown sectors having a U-shaped cross-section to be able to receive a downstream end of the ring and a distributor sector, each lock being mounted tight, that is to say without play, on the ring and the casing to hold them together.
  • the invention aims to overcome the problem mentioned above.
  • an object of the invention is to provide an assembly for keeping together two pieces of turbomachine vane support reliably while having a long service life.
  • Another object of the invention is to provide an assembly that is easy to assemble.
  • the invention also relates to a turbomachine comprising such an assembly.
  • an assembly 100 which comprises two support pieces of a turbomachine blade, the two parts being of revolution, and disposed one inside the other concentrically about the axis XX of the turbomachine, visible on the figure 5 .
  • the assembly 100 thus comprises two blade support pieces, a radially inner piece 10 and a radially outer piece 20 disposed around the first.
  • the inner part 10 is a turbine engine fixed blade platform as a flow distribution vane (also called distributor), the outer part 20 then being a fixed vane support ring.
  • a flow distribution vane also called distributor
  • the inner part 10 is a mobile blade ring, and the outer part 20 is then a ring housing.
  • the inner part 10 is a fixed vane support ring and the outer part 20 is a ring casing.
  • the inner part 10 is a blade platform which has been shown to have a blade A.
  • the platform 10 comprises an upstream spoiler 11 and a downstream spoiler 12 with respect to the air flow, represented in the figure by an arrow F.
  • the spoilers upstream 11 and downstream 12 respectively form the upstream and downstream ends of the platform.
  • the support ring 20 of the vane comprises, at its upstream end, a U-shaped hook 21 adapted to receive the upstream spoiler 11 of the platform, and at its downstream end a flange 22 extending towards the axis and to retain the spoiler downstream of the platform axially downstream.
  • the flange 22 is provided with a notch 23 adapted to be able to pivot the corner of the downstream spoiler 12 in this notch during the positioning of the ring 20 on the platform.
  • the ring support thus pivots around the platform (the pivot being at the level of the downstream spoiler), and comes to receive at the hook 21 the upstream spoiler. This results in an axial clearance between the hook 21 and the upstream spoiler 11 once the ring is in position on the platform 10.
  • the ring housing 20 has downstream circumferential flanges 22 which are positioned facing downstream circumferential flanges 12 of the blading ring 10.
  • a protuberance 13 on said flange makes it possible to prevent displacement of the casing upstream with respect to the blading ring 10. However, in the opposite direction downstream, and in the radial direction, the relative movements of the casing 20 and the blading ring 10 are not blocked.
  • the assembly 100 thus comprises a locking system 30 parts to prohibit their relative axial and radial translation (relative to the axis of the turbomachine).
  • this system 30 comprises a crown 40 having a U-shaped section comprising two parallel arms 41, 42 connected together at one end by a transverse bar 43.
  • the length of the transverse bar 43 defines the spacing between the arms, which must be sufficient to receive one end of the two parts 10, 20.
  • the crown receives, as illustrated on Figures 1a and 1b , the downstream spoiler 12 of the platform and the flange 22 of the ring, so that an inner arm 41 of the ring is facing an inner face of the downstream spoiler 12 and an outer arm 42 is opposite of the outer face of the ring.
  • the crown receives the downstream circumferential flanges 12, 22 of the two parts, the inner arm 41 being opposite the internal face of the downstream flange 12 of the ring, and the outer arm 42 facing the outer face of the downstream flange 22 of the housing.
  • the ring 40 is shaped so as to be mounted by interconnection on one of the parts.
  • the ring 40 and one of the parts, preferably the outer part 20, are shaped so as to cooperate together by interconnection.
  • they comprise dog teeth 44, 24, complementary, that is to say that the dog teeth of each piece are of equal length and distributed at constant angular interval, and the angular interval between two teeth dog 24, 44 of a piece corresponding to or greater than the length of a dog tooth 44, 24 of the other piece.
  • dog teeth 44 are protuberances of the outer arm 42 of the crown, which project inwardly, that is to say towards the axis of revolution of the crown.
  • the outer part 20 comprises on its outer surface the dog teeth 24, extending radially in the opposite direction of the axis of revolution of the workpiece.
  • the crown can thus be mounted by interconnection on the parts 10, 20 by receiving the end of the two parts, which makes it possible to stop in translation in the radial direction of the two parts 10, 20 relative to each other. the other (because the inner part 10 is held by the ring against the outer part), and in axial relative translation, because the dog teeth 44 and the transverse bar 43 of the crown deprive the outer member 20 of axial movement.
  • the assembly by interconnection of the crown on the parts allows to allow the presence of clearances between the ring and the parts 10,20, which allow the parts to expand, especially because of the thermal stresses involved, without reducing on their life span.
  • the inner part 10 may comprise dog teeth, positioned on its radially inner surface and extending radially.
  • the crown 40 then comprises dog teeth 44 on its inner arm 41, the teeth then protruding outwardly.
  • the ring 40 is advantageously split, that is to say that it extends over an angular sector less than 360 °, but advantageously greater than 350 °.
  • the slot 45 of the ring 40 also allows the parts to expand under thermal stress without damaging the crown or the parts themselves.
  • the locking system 30 of the parts further comprises a rotational locking member 50 of the ring 40 relative to the two parts 10, 20.
  • This rotational stop member is advantageously positioned at the slot 45 of the crown. 40.
  • the rotational stop member 50 comprises a hook 51 which is adapted to receive the end of the two parts 10, 20.
  • the ends are as before the end of the downstream spoiler 12 and the flange 22.
  • the ends are their downstream circumferential rims 12, 22.
  • the hook 51 comprises in particular an arm 52 extending along one of the parts 10, 20, advantageously along the outer part 20.
  • the arm 52 comprises a through hole 53 forming a housing for a pin 59 extending to through an orifice (not shown) provided in the part along which the arm extends.
  • the orifice 53 advantageously has the same shape as the section of the pin 59, namely advantageously a circular shape.
  • the crown 40 When the crown 40 is mounted on the parts by interconnection, it is positioned so that the dog teeth 24, 44 are opposite and thus the crown fulfills its role of radial and axial stop.
  • the hook 51 is mounted at the slot 45 to receive the pieces, and the pin 59 is inserted into the housing 53 of the hook, thus maintaining the angular position of the hook of the ring 40 constant.
  • the hook 51 occupying the slot 45 of the crown, it can not pivot around the parts 10, 20 until the dog teeth are no longer facing and the ring 40 can be removed.
  • the hook 51 further comprises a groove 54 therethrough adjacent the housing 53, and opening on one side of the hook. In this way, the pin can be inserted into the housing by sliding in the groove until it reaches the housing 53.
  • the groove preferably has edges converging towards the housing, the housing itself having a diameter greater than the spacing of the edges of the groove at its end adjacent to the housing, so that the pin, once inserted into the housing by displacement in the groove, can not come out again.
  • the hook 51 then advantageously comprises a cavity 55, preferably through, and adjacent to the housing, this cavity 55 being preferably opposite the groove with respect to the housing, thus allowing the hook 51 to deform elastically when the insertion of the peg 59 into the housing 53.
  • This cavity 55 advantageously has a width less than the diameter of the housing 53, to prevent a movement of the pin from the housing 53 to the cavity 55 once inserted into the housing 53.
  • a first step 1100 the two blade support pieces 10 are positioned concentrically one inside the other.
  • the pieces are nested together in a manner known to those skilled in the art, to obtain the provisions respectively illustrated in FIG. Figures 1a, 1b in one case and 1c in the other case.
  • 1200 is then positioned a ring 40 by interconnection on the parts.
  • 1210 is brought a crown 40 by shifting the dog teeth 44 of the ring relative to the dog teeth 24 of one of the parts, and by engaging the ring 40 to the pieces so that the ends of the pieces are received between the arms 41, 42 of the crown.
  • the crown 40 is then pivoted with respect to the parts 10, 20, so that the clutch teeth 44 of the ring face the clutch teeth 24 of the part, for example the outer piece 20, and that thus the crown forms a stop in axial translation of the workpiece.
  • a member 50 for stopping rotation of the ring relative to the parts.
  • a hook 51 comprising a groove 54 adjacent to the housing 53. 1310 is engaged an anti-rotation pin 59 through one of the parts, and 1320 is brought to the hook 51 at of the slot, so that it receives the end of the pieces and that the pin 59 is received in the groove. The hook 51 is progressively displaced so that the pin 59 moves in the groove until it reaches the housing 53.
  • the pin 59 is advantageously locked in the housing by the converging edges of the groove.

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

Description

DOMAINE DE L'INVENTIONFIELD OF THE INVENTION

L'invention concerne un ensemble permettant le verrouillage en translation relative de deux pièces de support d'aubage de turbomachine telles que par exemple une plate-forme d'aubage fixe et un anneau de support d'aubage ou un anneau d'aubage mobile et un carter d'anneau.The invention relates to an assembly for locking in relative translation two turbomachine blade support parts such as for example a fixed blade platform and a vane support ring or a mobile blade ring and a ring case.

L'invention s'applique notamment au verrouillage d'une plate-forme d'aubage de distribution de flux de turbomachine à un anneau de support dudit aubage de distribution comme par exemple est connu du document EP 0 967 364 .The invention applies in particular to the locking of a turbomachine flow distribution vanes platform to a support ring of said distribution vane, as is known from the document EP 0 967 364 .

ETAT DE LA TECHNIQUESTATE OF THE ART

Un exemple de turbomachine a été illustré en figure 5.An example of a turbomachine has been illustrated in figure 5 .

Une turbomachine 1 comporte typiquement une nacelle qui forme une ouverture pour l'admission d'un flux déterminé d'air vers le moteur proprement dit. Généralement, la turbomachine comprend une ou plusieurs sections de compression 3 de l'air admis dans: le moteur (généralement une section basse pression et une section haute pression). L'air ainsi comprimé est admis dans la chambre de combustion 5 et mélangé avec du carburant avant d'y être brûlé.A turbomachine 1 typically comprises a nacelle which forms an opening for the admission of a given flow of air to the engine itself. Generally, the turbomachine comprises one or more compression sections 3 of the air admitted into the engine (generally a low pressure section and a high pressure section). The air thus compressed is admitted into the combustion chamber 5 and mixed with fuel before being burned.

Les gaz de combustion chauds issus de cette combustion sont ensuite détendus dans différents étages de turbine. Une première détente est faite dans un étage à haute pression 6 immédiatement en aval de la chambre de combustion et qui reçoit gaz à la température la plus élevée. Les gaz sont détendus à nouveau en étant guidés à travers les étages de turbine dits à basse pression 7.The hot combustion gases from this combustion are then expanded in different turbine stages. A first expansion is made in a high pressure stage 6 immediately downstream of the combustion chamber and which receives gas at the highest temperature. The gases are expanded again by being guided through so-called low pressure turbine stages 7.

Une turbine, haute pression 6 ou basse pression 7, comporte classiquement un ou plusieurs étages, chacun étant constitué d'une rangée d'aubes de turbine fixes, aussi appelée distributeur, suivie d'une rangée d'aubes mobiles de turbine, qui forment le rotor. Les distributeurs sont fixés ensemble par l'intermédiaire d'un anneau. Le distributeur 2 dévie le flux de gaz prélevé au niveau de la chambre de combustion vers les aubes mobiles de turbine à un angle et une vitesse appropriés afin d'entraîner en rotation ces aubes mobiles et le rotor de la turbine.A turbine, high pressure 6 or low pressure 7, conventionally comprises one or more stages, each consisting of a row of stationary turbine blades, also called distributor, followed by a row of turbine blades, which form the rotor. The dispensers are fixed together via a ring. Dispenser 2 deflects the gas stream drawn at the combustion chamber to the turbine blades at a suitable angle and speed to drive these rotating blades and the rotor of the turbine in rotation.

Chaque distributeur est sectorisé, c'est-à-dire formé de plusieurs secteurs de distributeur disposés circonférentiellement bout à bout autour d'un axe X-X longitudinal de la turbomachine. Chaque secteur de distributeur comprend une pluralité d'aubes s'étendant radialement par rapport à l'axe X-X de la turbomachine de manière à relier un élément annulaire radialement interne (ou plateforme interne) et un élément annulaire radialement externe (ou plateforme externe), qui forment ensemble une veine annulaire en regard des aubes mobiles de la turbine.Each distributor is sectorized, that is to say formed of several distributor sectors arranged circumferentially end to end about a longitudinal axis XX of the turbomachine. Each distributor sector comprises a plurality of blades extending radially relative to the axis XX of the turbomachine so as to connect a radially inner annular element (or internal platform) and a radially outer annular element (or external platform), which together form an annular vein facing the blades of the turbine.

Sur la plate-forme externe du distributeur est monté un anneau de support du distributeur, qui est une pièce de révolution autour de l'axe de la turbomachine. L'anneau et le distributeur doivent être solidaires l'un de l'autre. A cet égard, des moyens de blocage d'une translation relative dans la direction axiale ou radiale (par rapport à l'axe de la turbomachine) doivent être prévus.On the external platform of the distributor is mounted a support ring of the distributor, which is a part of revolution around the axis of the turbomachine. The ring and the distributor must be integral with each other. In this respect, means for blocking a relative translation in the axial or radial direction (relative to the axis of the turbomachine) must be provided.

On connait d'après le document FR 2 887 920 des verrous appliqués de manière analogue à une section de carter de turbomachine s'étendant autour d'un anneau d'aubage mobile.We know from the document FR 2,887,920 locks applied analogously to a turbomachine casing section extending around a movable vane ring.

Les verrous sont en forme de secteurs de couronne présentant une section transversale en U pour pouvoir recevoir une extrémité aval de l'anneau et d'un secteur de distributeur, chaque verrou étant monté serré, c'est-à-dire sans jeu, sur l'anneau et le carter pour les maintenir solidaires l'un de l'autre.The locks are in the form of crown sectors having a U-shaped cross-section to be able to receive a downstream end of the ring and a distributor sector, each lock being mounted tight, that is to say without play, on the ring and the casing to hold them together.

Cette solution n'est néanmoins pas transposable au verrouillage d'une plate-forme de distributeur (c'est-à-dire d'aubage fixe) à un anneau de support de ce distributeur à cause des contraintes mécaniques et thermiques trop importantes dans ces pièces, résultant respectivement des efforts du flux d'air sur le distributeur et de la dilatation thermique des pièces.This solution is nevertheless not transferable to the locking of a distributor platform (that is to say fixed blade) to a support ring of this distributor because of the mechanical and thermal stresses too important in these parts, resulting respectively from the forces of the air flow on the distributor and the thermal expansion of the parts.

En effet, en cas de serrage d'un verrou sur les pièces, l'absence de jeu entre le verrou d'une part et le distributeur et l'anneau d'autre part, implique que les contraintes dans les pièces se traduisent par des efforts importants appliqués sur le verrou, entraînant la déformation et la dégradation rapide de celui-ci.Indeed, in case of tightening a lock on the parts, the absence of clearance between the lock on the one hand and the distributor and the ring on the other hand, implies that the stresses in the parts are translated into significant forces applied to the lock, causing deformation and rapid degradation thereof.

Il existe donc un besoin pour un système de durée de vie accrue, permettant de bloquer un anneau de distributeur avec une plate-forme externe de distributeur.There is therefore a need for an increased life system, making it possible to block a distributor ring with an external distributor platform.

PRESENTATION DE L'INVENTIONPRESENTATION OF THE INVENTION

L'invention a pour but de pallier le problème mentionné ci-avant.The invention aims to overcome the problem mentioned above.

En particulier, un but de l'invention est de proposer un ensemble permettant de maintenir ensemble deux pièces de support d'aubage de turbomachine de manière fiable tout en présentant une longue durée de vie.In particular, an object of the invention is to provide an assembly for keeping together two pieces of turbomachine vane support reliably while having a long service life.

Un autre but de l'invention est de proposer un ensemble facile à monter.Another object of the invention is to provide an assembly that is easy to assemble.

A cet égard, l'invention a pour objet un ensemble comprenant :

  • deux pièces de support d'aubage de turbomachine, les pièces étant de révolution, disposées l'une à l'intérieur de l'autre de manière concentrique autour d'un axe de turbomachine, et
  • un système de verrouillage des pièces pour interdire leur translation relative dans les directions axiale et radiale par rapport audit axe, le système de verrouillage comprenant une couronne fendue comportant une section transversale en U adaptée pour recevoir une extrémité des deux pièces,
l'ensemble étant caractérisé en ce que la couronne et l'une des pièces sont conformées pour permettre un engagement par crabotage de la couronne sur la pièce,
et en ce que le système de verrouillage comprend en outre un organe d'arrêt en rotation de la couronne relativement à la pièce avec laquelle elle est engagée par crabotage.In this respect, the subject of the invention is an assembly comprising:
  • two pieces of turbomachine blade support, the parts being of revolution, disposed one inside the other concentrically about a turbomachine axis, and
  • a locking system of the parts to prohibit their relative translation in the axial and radial directions relative to said axis, the locking system comprising a split ring comprising a U-shaped cross section adapted to receive one end of the two parts,
the assembly being characterized in that the ring and one of the parts are shaped to allow engagement by interconnection of the crown on the part,
and in that the locking system further comprises a rotational stop member of the ring relative to the part with which it is engaged by interconnection.

Avantageusement, mais facultativement, l'invention comporte en outre au moins l'une des caractéristiques suivantes:

  • la pièce interne est une plate-forme d'aubage fixe ou un anneau d'aubage, et la pièce externe est respectivement un anneau de support d'aubage fixe ou un carter d'anneau.
  • la section en U de la couronne comprend deux bras reliés entre eux par une barre transversale, telle que chaque bras se trouve en regard de l'une des pièces lorsque la couronne reçoit l'extrémité des pièces, l'un des bras et la pièce en regard dudit bras présentant des dents de crabot adaptées pour coopérer pour permettre l'engagement par crabotage de la couronne sur ladite pièce.
  • la pièce externe et le bras en regard de ladite pièce sont munis des dents de crabot.
  • l'organe d'arrêt en rotation comprend :
    • o un crochet positionné au niveau de la fente de la couronne et adapté pour recevoir l'extrémité des deux pièces, le crochet comprenant, sur un bras s'étendant le long d'une des pièces, un orifice traversant formant logement, et
    • o un pion de fixation du crochet, traversant la pièce le long de laquelle s'étend le bras du crochet, ledit pion étant reçu dans le logement du crochet.
  • Le crochet comporte en outre une rainure traversante adjacente au logement et débouchant sur un coté de crochet pour permettre l'insertion du pion dans le logement par la rainure.
  • La rainure présente des bords convergents vers le logement pour interdire la sortie du pion une fois inséré dans le logement.
  • Le crochet comporte en outre une cavité adjacente au logement, permettant une déformation élastique du crochet lors de l'insertion du pion dans le logement.
  • La cavité présente une largeur inférieure à la largeur du pion.
  • Le bras du crochet s'étend le long de la pièce externe et le pion traverse ladite pièce.
Advantageously, but optionally, the invention also comprises at least one of the following characteristics:
  • the inner part is a fixed blade platform or a vane ring, and the outer part is respectively a fixed vane support ring or a ring case.
  • the U-shaped section of the crown comprises two arms interconnected by a transverse bar, such that each arm is opposite one of the parts when the crown receives the end of the parts, one of the arms and the workpiece facing said arm having dog teeth adapted to cooperate to allow engagement by interconnection of the crown on said piece.
  • the outer part and the arm opposite said part are provided with dog teeth.
  • the rotational stop member comprises:
    • a hook positioned at the slot of the ring and adapted to receive the ends of the two pieces, the hook comprising, on an arm extending along one of the pieces, a through hole forming a housing, and
    • o a hook fixing pin, passing through the piece along which extends the hook arm, said pin being received in the housing of the hook.
  • The hook further comprises a through groove adjacent the housing and opening on one side of the hook to allow the insertion of the pin in the housing by the groove.
  • The groove has convergent edges towards the housing to prevent the exit of the pin once inserted into the housing.
  • The hook further comprises a cavity adjacent to the housing, allowing elastic deformation of the hook during the insertion of the pin into the housing.
  • The cavity has a width less than the width of the pin.
  • The hook arm extends along the outer piece and the pin passes through said piece.

L'invention a également pour objet une turbomachine comprenant un tel ensemble.The invention also relates to a turbomachine comprising such an assembly.

L'invention a également pour objet un procédé de montage d'un tel ensemble comprenant les étapes consistant à :

  • monter les deux pièces de révolution l'une à l'intérieur de l'autre de manière concentrique,
  • amener la couronne fendue et l'engager par crabotage sur l'une des pièces, et
  • positionner l'organe d'arrêt en rotation de la couronne relativement à la pièce.
The invention also relates to a method of mounting such an assembly comprising the steps of:
  • mount the two pieces of revolution one inside the other in a concentric way,
  • bring the split crown and engage it by interconnection on one of the pieces, and
  • position the stop member in rotation of the crown relative to the workpiece.

Avantageusement, mais facultativement, au cours de ce procédé de montage, l'étape de positionnement de l'organe d'arrêt en rotation comprend les étapes consistant à :

  • positionner un pion anti-rotation au travers de l'une des pièces, et
  • positionner un crochet au niveau de la fente de la couronne, de manière à recevoir l'extrémité des deux pièces, et déplacer le crochet vers les pièces de manière à engager successivement le pion dans la rainure puis dans le logement du crochet.
Advantageously, but optionally, during this method of assembly, the step of positioning the rotational stop member comprises the steps of:
  • position an anti-rotation pin through one of the pieces, and
  • positioning a hook at the slot of the ring, so as to receive the end of the two parts, and move the hook to the parts so as to successively engage the pin in the groove and in the housing of the hook.

DESCRIPTION DES FIGURESDESCRIPTION OF THE FIGURES

D'autres caractéristiques, buts et avantages de la présente invention apparaîtront mieux à la lecture de la description détaillée qui va suivre, et au regard des dessins annexés donnés à titre d'exemples non limitatifs et sur lesquels :

  • Les figures 1a et 1b représentent une vue en coupe transversale d'un ensemble selon un mode de réalisation, respectivement au niveau d'une dent de crabot et au niveau d'un organe d'arrêt en rotation de la couronne sur les pièces.
  • La figure 1c représente une vue en coupe transversale d'un ensemble selon un autre mode de réalisation, au niveau d'une dent de crabot.
  • La figure 1d représente une vue en coupe transversale d'un ensemble selon un autre mode de réalisation, au niveau d'une dent de crabot.
  • La figure 2a représente une vue en perspective partielle d'un anneau de support d'aubage pouvant faire partie de l'ensemble représenté sur les figures 1a et 1b.
  • La figure 2b représente une vue de face partielle d'une couronne de verrouillage des pièces.
  • Les figures 3a à 3c sont des vues sous différentes perspectives d'un ensemble selon un mode de réalisation de l'invention.
  • La figure 3d représente un crochet utilisé pour l'arrêt en rotation d'une couronne.
  • La figure 4 représente schématiquement les principales étapes du procédé de montage d'un ensemble selon l'invention.
  • La figure 5, déjà décrite, est une vue en coupe d'un exemple de turbomachine sur laquelle l'ensemble selon l'invention peut être mis en oeuvre.
Other features, objects and advantages of the present invention will appear better on reading the detailed description which follows, and with reference to the appended drawings given by way of non-limiting examples and in which:
  • The Figures 1a and 1b represent a cross-sectional view of an assembly according to an embodiment, respectively at a dog tooth and at a stop member in rotation of the crown on the parts.
  • The figure 1c represents a cross-sectional view of an assembly according to another embodiment, at a dog tooth.
  • The figure 1d represents a cross-sectional view of an assembly according to another embodiment, at a dog tooth.
  • The figure 2a is a partial perspective view of a vane support ring that may be part of the assembly shown in FIGS. Figures 1a and 1b .
  • The figure 2b is a partial front view of a coin lock ring.
  • The Figures 3a to 3c are views from different perspectives of an assembly according to one embodiment of the invention.
  • The figure 3d represents a hook used for the rotational stop of a crown.
  • The figure 4 schematically represents the main steps of the assembly method of an assembly according to the invention.
  • The figure 5 , already described, is a sectional view of an example of a turbomachine on which the assembly according to the invention can be implemented.

DESCRIPTION DETAILLEE D'AU MOINS UN MODE DE REALISATION DE L'INVENTIONDETAILED DESCRIPTION OF AT LEAST ONE EMBODIMENT OF THE INVENTION

En référence à la figure 3a, on a représenté un ensemble 100 qui comprend deux pièces de support d'un aubage de turbomachine, les deux pièces étant de révolution, et disposées l'une à l'intérieur de l'autre de manière concentrique autour de l'axe X-X de la turbomachine, visible sur la figure 5.With reference to the figure 3a , there is shown an assembly 100 which comprises two support pieces of a turbomachine blade, the two parts being of revolution, and disposed one inside the other concentrically about the axis XX of the turbomachine, visible on the figure 5 .

Par pièce de support d'un aubage de turbomachine, on entend :

  • dans le cas d'un aubage fixe, par exemple un aubage de distribution de flux : une plate-forme externe d'aubage reliant entre elles les aubes de l'aubage, ou un anneau de support d'un aubage, qui est disposé autour de ladite plate-forme, ou encore un carter d'anneau d'aubage, disposé autour dudit anneau.
  • dans le cas d'un aubage mobile, par exemple un aubage de compresseur: un anneau entourant l'aubage, ou un carter d'anneau, qui est disposé autour dudit anneau.
By a support part of a turbomachine blade is meant:
  • in the case of a fixed blade, for example a flow distribution vane: an external vane platform interconnecting the blades of the vane, or a support ring of a vane, which is arranged around of said platform, or a vane ring casing disposed around said ring.
  • in the case of a moving vane, for example a compressor vane: a ring surrounding the vane, or a ring housing, which is arranged around said ring.

L'ensemble 100 comprend donc deux pièces de support d'aubage, une pièce radialement interne 10 et une pièce radialement externe 20 disposée autour de la première.The assembly 100 thus comprises two blade support pieces, a radially inner piece 10 and a radially outer piece 20 disposed around the first.

Selon un mode de réalisation préféré, la pièce interne 10 est une plate-forme d'aubage fixe de turbomachine comme un aubage de distribution de flux (également appelé distributeur), la pièce externe 20 étant alors un anneau de support d'aubage fixe.According to a preferred embodiment, the inner part 10 is a turbine engine fixed blade platform as a flow distribution vane (also called distributor), the outer part 20 then being a fixed vane support ring.

Selon un mode de réalisation alternatif, la pièce interne 10 est un anneau d'aubage mobile, et la pièce externe 20 est alors un carter d'anneau.According to an alternative embodiment, the inner part 10 is a mobile blade ring, and the outer part 20 is then a ring housing.

Selon une autre variante, la pièce interne 10 est un anneau de support d'aubage fixe et la pièce externe 20 est un carter d'anneau.According to another variant, the inner part 10 is a fixed vane support ring and the outer part 20 is a ring casing.

Sur les figures 1a et 1b, on a représenté l'ensemble 100 dans le premier cas. La pièce interne 10 est une plate-forme d'aubage dont on a représenté une aube A. La plate-forme 10 comprend un becquet amont 11 et un becquet aval 12 par rapport au flux d'air, représenté sur la figure par une flèche F. Les becquets amont 11 et aval 12 forment respectivement les extrémités amont et aval de la plate-forme.On the Figures 1a and 1b the set 100 is shown in the first case. The inner part 10 is a blade platform which has been shown to have a blade A. The platform 10 comprises an upstream spoiler 11 and a downstream spoiler 12 with respect to the air flow, represented in the figure by an arrow F. The spoilers upstream 11 and downstream 12 respectively form the upstream and downstream ends of the platform.

L'anneau de support 20 de l'aubage comprend quant à lui, à son extrémité amont, un crochet en U 21 adapté pour recevoir le becquet amont 11 de la plate-forme, et à son extrémité aval un rebord 22 s'étendant vers l'axe et permettant de retenir le becquet aval de la plate-forme axialement vers l'aval.The support ring 20 of the vane comprises, at its upstream end, a U-shaped hook 21 adapted to receive the upstream spoiler 11 of the platform, and at its downstream end a flange 22 extending towards the axis and to retain the spoiler downstream of the platform axially downstream.

Le rebord 22 est pourvu d'une encoche 23 adaptée pour pouvoir faire pivoter le coin du becquet aval 12 dans cette encoche lors du positionnement de l'anneau 20 sur la plate-forme. Le support d'anneau pivote ainsi autour de la plate-forme (le pivot se trouvant au niveau du becquet aval), et vient recevoir au niveau du crochet 21 le becquet amont. Il en résulte un jeu axial entre le crochet 21 et le becquet amont 11 une fois que l'anneau se trouve en position sur la plate-forme 10.The flange 22 is provided with a notch 23 adapted to be able to pivot the corner of the downstream spoiler 12 in this notch during the positioning of the ring 20 on the platform. The ring support thus pivots around the platform (the pivot being at the level of the downstream spoiler), and comes to receive at the hook 21 the upstream spoiler. This results in an axial clearance between the hook 21 and the upstream spoiler 11 once the ring is in position on the platform 10.

De plus, comme visible sur les figures, au niveau du rebord 22 le becquet aval 11 n'est pas retenu radialement.In addition, as shown in the figures, at the edge 22 the downstream spoiler 11 is not retained radially.

Dans le cas où la pièce interne 10 est un anneau d'aubage mobile, et où la pièce externe 20 est un carter d'anneau, en référence à la figure 1c, le carter d'anneau 20 comporte des rebords circonférentiels aval 22 qui sont positionnés en regard de rebords circonférentiels aval 12 de l'anneau d'aubage 10.In the case where the inner part 10 is a movable vane ring, and the outer part 20 is a ring casing, with reference to the figure 1c the ring housing 20 has downstream circumferential flanges 22 which are positioned facing downstream circumferential flanges 12 of the blading ring 10.

Une protubérance 13 sur ledit rebord permet d'interdire un déplacement du carter vers l'amont par rapport à l'anneau d'aubage 10. Cependant dans la direction opposée vers l'aval, et dans la direction radiale, les mouvements relatifs du carter 20 et de l'anneau d'aubage 10 ne sont pas bloqués.A protuberance 13 on said flange makes it possible to prevent displacement of the casing upstream with respect to the blading ring 10. However, in the opposite direction downstream, and in the radial direction, the relative movements of the casing 20 and the blading ring 10 are not blocked.

L'ensemble 100 comprend donc un système de verrouillage 30 des pièces pour interdire leur translation relative axiale et radiale (par rapport à l'axe de la turbomachine).The assembly 100 thus comprises a locking system 30 parts to prohibit their relative axial and radial translation (relative to the axis of the turbomachine).

Comme visible plus particulièrement sur les figures 2b et 3a à 3c, ce système 30 comprend une couronne 40 présentant une section en U comprenant deux bras 41, 42 parallèles, reliés entre eux à une extrémité par une barre transversale 43.As visible more particularly on figures 2b and 3a to 3c , this system 30 comprises a crown 40 having a U-shaped section comprising two parallel arms 41, 42 connected together at one end by a transverse bar 43.

La longueur de la barre transversale 43 définit l'écartement entre les bras, qui doit être suffisant pour recevoir une extrémité des deux pièces 10, 20. Dans le cas où les pièces sont respectivement une plate-forme d'aubage et un anneau de support, la couronne reçoit, comme illustré sur les figures 1a et 1b, le becquet aval 12 de la plate-forme et le rebord 22 de l'anneau, de sorte qu'un bras interne 41 de la couronne soit en regard d'une face interne du becquet aval 12 et un bras externe 42 soit en regard de la face externe de l'anneau.The length of the transverse bar 43 defines the spacing between the arms, which must be sufficient to receive one end of the two parts 10, 20. In the case where the parts are respectively a blade platform and a support ring , the crown receives, as illustrated on Figures 1a and 1b , the downstream spoiler 12 of the platform and the flange 22 of the ring, so that an inner arm 41 of the ring is facing an inner face of the downstream spoiler 12 and an outer arm 42 is opposite of the outer face of the ring.

Sur la figure 1c, dans le cas d'un anneau d'aubage 10 entouré d'un carter d'anneau 20, la couronne reçoit les rebords circonférentiels aval 12, 22 des deux pièces, le bras interne 41 étant en regard de la face interne du rebord aval 12 de l'anneau, et le bras externe 42 étant en regard de la face externe du rebord aval 22 du carter.On the figure 1c in the case of a vane ring 10 surrounded by a ring casing 20, the crown receives the downstream circumferential flanges 12, 22 of the two parts, the inner arm 41 being opposite the internal face of the downstream flange 12 of the ring, and the outer arm 42 facing the outer face of the downstream flange 22 of the housing.

En outre, la couronne 40 est conformée de manière à pouvoir être montée par crabotage sur l'une des pièces.In addition, the ring 40 is shaped so as to be mounted by interconnection on one of the parts.

Avantageusement, la couronne 40 et l'une des pièces, de préférence la pièce externe 20, sont conformées de manière à pouvoir coopérer ensemble par crabotage. A cet égard, elles comprennent des dents de crabot 44, 24, complémentaires, c'est-à-dire que les dents de crabot de chaque pièce sont de longueur égale et réparties à intervalle angulaire constant, et l'intervalle angulaire entre deux dents de crabot 24, 44 d'une pièce correspondant ou étant supérieur à la longueur d'une dent de crabot 44, 24 de l'autre pièce.Advantageously, the ring 40 and one of the parts, preferably the outer part 20, are shaped so as to cooperate together by interconnection. In this regard, they comprise dog teeth 44, 24, complementary, that is to say that the dog teeth of each piece are of equal length and distributed at constant angular interval, and the angular interval between two teeth dog 24, 44 of a piece corresponding to or greater than the length of a dog tooth 44, 24 of the other piece.

Selon un mode de réalisation préféré, qui est illustré sur les figures 1a, 1c, 2b et 3a, les dents de crabot 44 sont des protubérances du bras externe 42 de la couronne, qui font saillie vers l'intérieur, c'est-à-dire vers l'axe de révolution de la couronne.According to a preferred embodiment, which is illustrated on the figures 1a , 1 C , 2b and 3a , dog teeth 44 are protuberances of the outer arm 42 of the crown, which project inwardly, that is to say towards the axis of revolution of the crown.

D'autre part, la pièce externe 20 comprend sur sa surface externe les dents de crabot 24, s'étendant radialement dans la direction opposée de l'axe de révolution de la pièce.On the other hand, the outer part 20 comprises on its outer surface the dog teeth 24, extending radially in the opposite direction of the axis of revolution of the workpiece.

La couronne peut ainsi être montée par crabotage sur les pièces 10, 20 en recevant l'extrémité des deux pièces, ce qui permet d'assurer l'arrêt en translation selon la direction radiale des deux pièces 10, 20 l'une par rapport à l'autre (car la pièce interne 10 est maintenue par la couronne contre la pièce externe), et en translation relative axiale, car les dents de crabot 44 et la barre transversale 43 de la couronne privent la pièce externe 20 de mouvement axial.The crown can thus be mounted by interconnection on the parts 10, 20 by receiving the end of the two parts, which makes it possible to stop in translation in the radial direction of the two parts 10, 20 relative to each other. the other (because the inner part 10 is held by the ring against the outer part), and in axial relative translation, because the dog teeth 44 and the transverse bar 43 of the crown deprive the outer member 20 of axial movement.

De plus, le montage par crabotage de la couronne sur les pièces permet d'autoriser la présence de jeux entre la couronne et les pièces 10,20, qui permettent aux pièces de se dilater, notamment à cause des contraintes thermiques en jeu, sans réduire sur leur durée de vie.In addition, the assembly by interconnection of the crown on the parts allows to allow the presence of clearances between the ring and the parts 10,20, which allow the parts to expand, especially because of the thermal stresses involved, without reducing on their life span.

En outre, l'absence de serrage implique que la couronne ne doit pas supporter de contraintes mécaniques importantes. Ceci permet de diminuer le dimensionnement de la couronne, et donc de réduire l'encombrement et la masse de la couronne, ce qui allège la masse de l'ensemble de la turbomachine dans laquelle les pièces 10, 20 sont installées.In addition, the absence of clamping implies that the crown must not withstand significant mechanical stresses. This makes it possible to reduce the dimensioning of the ring gear, and therefore to reduce the bulk and the weight of the ring gear, which reduces the weight of the entire turbine engine in which the parts 10, 20 are installed.

Selon un mode de réalisation alternatif représenté en figure 1d, la pièce interne 10 peut comprendre des dents de crabot, positionnées sur sa surface radialement interne et s'étendant radialement. La couronne 40 comprend alors des dents de crabot 44 sur son bras interne 41, les dents faisant alors saillie vers l'extérieur.According to an alternative embodiment represented in figure 1d , the inner part 10 may comprise dog teeth, positioned on its radially inner surface and extending radially. The crown 40 then comprises dog teeth 44 on its inner arm 41, the teeth then protruding outwardly.

La couronne 40 est avantageusement fendue, c'est-à-dire qu'elle s'étend sur un secteur angulaire inférieur à 360°, mais avantageusement supérieur à 350°. La fente 45 de la couronne 40 permet également aux pièces de se dilater en cas de contraintes thermiques sans endommager la couronne ni les pièces elles-mêmes.The ring 40 is advantageously split, that is to say that it extends over an angular sector less than 360 °, but advantageously greater than 350 °. The slot 45 of the ring 40 also allows the parts to expand under thermal stress without damaging the crown or the parts themselves.

Le système de verrouillage 30 des pièces comprend en outre un organe d'arrêt en rotation 50 de la couronne 40 par rapport aux deux pièces 10, 20. Cet organe d'arrêt en rotation est avantageusement positionné au niveau de la fente 45 de la couronne 40.The locking system 30 of the parts further comprises a rotational locking member 50 of the ring 40 relative to the two parts 10, 20. This rotational stop member is advantageously positioned at the slot 45 of the crown. 40.

Comme illustré en figures 1b et 3a à 3c, l'organe d'arrêt en rotation 50 comprend un crochet 51 qui est adapté pour recevoir l'extrémité des deux pièces 10, 20. Dans le cas où les pièces sont une plate-forme d'aubage fixe 10 et un anneau de support 20, les extrémités sont comme précédemment l'extrémité du becquet aval 12 et du rebord 22.As illustrated in figures 1b and 3a to 3c , the rotational stop member 50 comprises a hook 51 which is adapted to receive the end of the two parts 10, 20. In the case where the parts are a fixed blade platform 10 and a support ring 20, the ends are as before the end of the downstream spoiler 12 and the flange 22.

Dans le cas où les pièces sont un anneau d'aubage mobile 10 et un carter d'anneau, les extrémités sont leurs rebords circonférentiels aval 12, 22.In the case where the parts are a movable vane ring 10 and a ring case, the ends are their downstream circumferential rims 12, 22.

Le crochet 51 comprend en particulier un bras 52 s'étendant le long d'une des pièces 10, 20, avantageusement le long de la pièce externe 20. Le bras 52 comprend un orifice traversant 53 formant logement pour un pion 59 s'étendant au travers d'un orifice (non représenté) prévu dans la pièce le long de laquelle s'étend le bras.The hook 51 comprises in particular an arm 52 extending along one of the parts 10, 20, advantageously along the outer part 20. The arm 52 comprises a through hole 53 forming a housing for a pin 59 extending to through an orifice (not shown) provided in the part along which the arm extends.

L'orifice 53 présente avantageusement la même forme que la section du pion 59, à savoir avantageusement une forme circulaire.The orifice 53 advantageously has the same shape as the section of the pin 59, namely advantageously a circular shape.

Lorsque la couronne 40 est montée sur les pièces par crabotage, elle est positionnée de sorte que les dents de crabot 24, 44 soient en regard et qu'ainsi la couronne remplisse son rôle d'arrêt radial et axial.When the crown 40 is mounted on the parts by interconnection, it is positioned so that the dog teeth 24, 44 are opposite and thus the crown fulfills its role of radial and axial stop.

Dans cette position, le crochet 51 est monté au niveau de la fente 45 pour recevoir les pièces, et le pion 59 est inséré dans le logement 53 du crochet, maintenant ainsi la position angulaire du crochet de la couronne 40 constante. Il en résulte que, le crochet 51 occupant la fente 45 de la couronne, celle-ci ne peut pivoter autour des pièces 10, 20 jusqu'à ce que les dents de crabot ne soient plus en regard et que la couronne 40 puisse être retirée.In this position, the hook 51 is mounted at the slot 45 to receive the pieces, and the pin 59 is inserted into the housing 53 of the hook, thus maintaining the angular position of the hook of the ring 40 constant. As a result, the hook 51 occupying the slot 45 of the crown, it can not pivot around the parts 10, 20 until the dog teeth are no longer facing and the ring 40 can be removed.

Comme visible plus spécifiquement sur la figure 3a et la figure 3d, le crochet 51 comporte en outre une rainure 54 traversante adjacente au logement 53, et débouchant sur l'un des côtés du crochet. De cette manière, le pion peut être inséré dans le logement par glissement dans la rainure jusqu'à arriver dans le logement 53.As visible more specifically on the figure 3a and the figure 3d , the hook 51 further comprises a groove 54 therethrough adjacent the housing 53, and opening on one side of the hook. In this way, the pin can be inserted into the housing by sliding in the groove until it reaches the housing 53.

La rainure présente de préférence des bords convergents vers le logement, le logement présentant lui-même un diamètre supérieur à l'écartement des bords de la rainure à son extrémité adjacente au logement, pour que le pion, une fois inséré dans le logement par déplacement dans la rainure, ne puisse plus en ressortir.The groove preferably has edges converging towards the housing, the housing itself having a diameter greater than the spacing of the edges of the groove at its end adjacent to the housing, so that the pin, once inserted into the housing by displacement in the groove, can not come out again.

Ceci nécessite de déformer légèrement le crochet, au niveau des bords de la rainure 54, au moment du passage du pion 59 pour autoriser son passage.This requires slightly deforming the hook, at the edges of the groove 54, at the time of passage of the pin 59 to allow its passage.

Le crochet 51 comporte alors avantageusement une cavité 55, de préférence traversante, et adjacente au logement, cette cavité 55 se trouvant de préférence à l'opposé de la rainure par rapport au logement, permettant ainsi au crocher 51 de se déformer élastiquement lors de l'insertion du pion 59 dans le logement 53.The hook 51 then advantageously comprises a cavity 55, preferably through, and adjacent to the housing, this cavity 55 being preferably opposite the groove with respect to the housing, thus allowing the hook 51 to deform elastically when the insertion of the peg 59 into the housing 53.

Cette cavité 55 présente avantageusement une largeur inférieure au diamètre du logement 53, pour interdire un déplacement du pion depuis le logement 53 vers la cavité 55 une fois inséré dans le logement 53.This cavity 55 advantageously has a width less than the diameter of the housing 53, to prevent a movement of the pin from the housing 53 to the cavity 55 once inserted into the housing 53.

On va maintenant décrire, en référence à la figure 4, les principales étapes d'un procédé de montage 1000 de l'ensemble 100 précédemment décrit.We will now describe, with reference to the figure 4 , the main steps of a mounting method 1000 of the assembly 100 previously described.

Au cours d'une première étape 1100, on positionne les deux pièces de support d'aubage 10, 20 l'une à l'intérieur de l'autre, de manière concentrique. Les pièces sont emboitées ensemble de manière connue de l'homme de l'art, pour obtenir les dispositions respectivement illustrées en figures 1a, 1b dans un cas et, 1c dans l'autre cas.In a first step 1100, the two blade support pieces 10 are positioned concentrically one inside the other. The pieces are nested together in a manner known to those skilled in the art, to obtain the provisions respectively illustrated in FIG. Figures 1a, 1b in one case and 1c in the other case.

On positionne ensuite 1200 une couronne 40 par crabotage sur les pièces. Pour ce faire, on amène 1210 une couronne 40 en décalant les dents de crabot 44 de la couronne par rapport aux dents de crabot 24 d'une des pièces, et en engageant la couronne 40 aux pièces de manière que les extrémités des pièces soient reçues entre les bras 41, 42 de la couronne.1200 is then positioned a ring 40 by interconnection on the parts. To do this, 1210 is brought a crown 40 by shifting the dog teeth 44 of the ring relative to the dog teeth 24 of one of the parts, and by engaging the ring 40 to the pieces so that the ends of the pieces are received between the arms 41, 42 of the crown.

On pivote 1220 ensuite la couronne 40 par rapport aux pièces 10, 20, de sorte que les dents de crabot 44 de la couronne viennent en regard des dents de crabot 24 de la pièce, par exemple la pièce externe 20, et qu'ainsi la couronne forme une butée en translation axial de la pièce.The crown 40 is then pivoted with respect to the parts 10, 20, so that the clutch teeth 44 of the ring face the clutch teeth 24 of the part, for example the outer piece 20, and that thus the crown forms a stop in axial translation of the workpiece.

Enfin, au cours d'une étape 1300, on positionne un organe 50 d'arrêt en rotation de la couronne par rapport aux pièces.Finally, during a step 1300, is positioned a member 50 for stopping rotation of the ring relative to the parts.

Pour ce faire, on se munit de préférence d'un crochet 51 comprenant une rainure 54 adjacente au logement 53. On engage 1310 un pion anti-rotation 59 au travers de l'une des pièces, et on amène 1320 le crochet 51 au niveau de la fente, de sorte qu'il reçoive l'extrémité des pièces et que le pion 59 soit reçu dans la rainure. On déplace progressivement le crochet 51 pour que le pion 59 se déplace dans la rainure jusqu'à atteindre le logement 53.To do this, it is best equipped with a hook 51 comprising a groove 54 adjacent to the housing 53. 1310 is engaged an anti-rotation pin 59 through one of the parts, and 1320 is brought to the hook 51 at of the slot, so that it receives the end of the pieces and that the pin 59 is received in the groove. The hook 51 is progressively displaced so that the pin 59 moves in the groove until it reaches the housing 53.

Le pion 59 se trouve avantageusement bloqué dans le logement par les bords convergents de la rainure.The pin 59 is advantageously locked in the housing by the converging edges of the groove.

On a ainsi proposé un ensemble permettant le verrouillage en translation axiale et radiale de deux pièces de support d'aubage de turbomachine, qui présente une durée de vie importante et qui est simple de montage.An assembly has thus been proposed for locking in axial and radial translation two turbomachine blade support pieces, which has a long service life and is simple to mount.

Claims (13)

  1. An assembly (100) comprising:
    - two blade-supporting parts (10, 20) of a turbine engine, the parts being axisymmetrical, positioned one inside the other in a concentric way around a turbine engine axis, and
    - a system (30) for locking the parts (10, 20) in order to prevent their relative translation in the axial and radial directions with respect to said axis, the locking system comprising a split crown (40) including a U-shape cross-section adapted for receiving an end of both parts (10, 20),
    the assembly being characterized in that the crown (40) and one of the parts (10, 20) are conformed so as to allow engagement by clutching of the crown (40) on the part (10, 20),
    and in that the locking system (30) further comprises a member (50) for stopping rotation of the crown (40) relatively to the part (10, 20) with which it is engaged by clutching.
  2. The assembly (100) according to claim 1, wherein the internal part (10) is a fixed blading platform or a blading ring, and the external part (20) is a fixed blade-supporting ring or a ring case, respectively.
  3. The assembly (100) according to one of claims 1 or 2, wherein the U-shape section of the crown (40) comprises two arms (41, 42) connected together by a transverse bar (43), such that each arm (41, 42) is found facing one of the parts (10, 20) when the crown receives the end of the parts,
    one of the arms (42) and the part (20) facing said arm having clutch teeth (44, 24) adapted for cooperating so as to allow engagement by clutching of the crown (40) on said part (20).
  4. The assembly (100) according to claim 3, wherein the external part (20) and the arm (42) facing said part are provided with clutch teeth (24, 44).
  5. The assembly (100) according to one of the preceding claims, wherein the member (50) for stopping rotation comprises:
    - a hook (51) positioned at the slot (45) of the crown (40) and adapted for receiving the end of both parts (10, 20), the hook (51) comprising, on an arm (52) extending along one of the parts, a through-orifice forming a housing (53), and
    - a pin (59) for attaching the hook, crossing the part (20) along which extends the arm of the hook (52), said pin (59) being received in the housing (53) of the hook (51).
  6. The assembly (100) according to claim 5, wherein the hook (51) further includes a through-groove (54) adjacent to the housing (53) and opening onto one side of the hook (51) in order to allow insertion of the pin into the housing through the groove (54).
  7. The assembly according to claim 6, wherein the groove (54) has edges converging towards the housing (53) in order to prevent exit of the pin (59) once it is inserted into the housing (53).
  8. The assembly (100) according to one of claims 5 to 7, wherein the hook (51) further includes a cavity (55) adjacent to the housing, allowing elastic deformation of the hook (51) upon inserting the pin (59) into the housing (53).
  9. The assembly (100) according to the preceding claim, wherein the cavity (55) has a width smaller than the width of the pin (59).
  10. The assembly (100) according to one of the preceding claims, wherein the arm (52) of the hook (51) extends along the external part (20) and the pin (59) crosses said part (20).
  11. A turbine engine (1), comprising an assembly according to one of the preceding claims.
  12. A method (1000) for mounting an assembly (100) according to one of claims 1 to 10, comprising the steps of:
    - mounting (1100) both axisymmetrical parts (10, 20) one inside the other in a concentric way,
    - bringing (1200) the split crown (40) and engaging it by clutching on one of the parts (20), and
    - positioning (1300) the member (50) for stopping rotation of the crown (40) relatively to the part (20).
  13. The method (1000) according to the preceding claim, for mounting a system (100) according to one of claims 6 to 10, wherein the step (1300) for positioning the rotation-stopping member (50) comprises the steps of:
    - positioning (1310) an anti-rotation pin (59) through one of the parts (20), and
    - positioning (1320) a hook (51) at the slot (45) of the crown (40), so as to receive the end of both parts (10, 20), and displace the hook (51) towards the parts so as to successively engage the pin (59) into the groove (54) and then into the housing (53) of the hook (51).
EP14786954.9A 2013-08-13 2014-08-11 Improvement for the locking of blade-supporting components Active EP3033495B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1357982A FR3009740B1 (en) 2013-08-13 2013-08-13 IMPROVEMENT FOR LOCKING AUBAGE SUPPORT PARTS
PCT/FR2014/052079 WO2015022468A1 (en) 2013-08-13 2014-08-11 Improvement for the locking of blade-supporting components

Publications (2)

Publication Number Publication Date
EP3033495A1 EP3033495A1 (en) 2016-06-22
EP3033495B1 true EP3033495B1 (en) 2018-10-31

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Application Number Title Priority Date Filing Date
EP14786954.9A Active EP3033495B1 (en) 2013-08-13 2014-08-11 Improvement for the locking of blade-supporting components

Country Status (9)

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US (1) US10247039B2 (en)
EP (1) EP3033495B1 (en)
JP (1) JP2016530441A (en)
CN (1) CN105579670B (en)
BR (1) BR112016002953A8 (en)
CA (1) CA2920983C (en)
FR (1) FR3009740B1 (en)
RU (1) RU2672208C2 (en)
WO (1) WO2015022468A1 (en)

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FR3046410B1 (en) * 2016-01-05 2017-12-29 Snecma AIRCRAFT TURBOMACHINE ASSEMBLY WITH NON-CARNETIC CONTRAROTATIVE PROPELLERS, COMPRISING A SMALL-DIMENSIONAL SERVITUDE PASSAGE WALL
CN109653816B (en) * 2019-01-23 2024-05-10 江苏核电有限公司 Propping tool for steam turbine with shroud blades and propping method thereof
US11939888B2 (en) * 2022-06-17 2024-03-26 Rtx Corporation Airfoil anti-rotation ring and assembly

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Publication number Publication date
RU2016108869A (en) 2017-09-19
RU2672208C2 (en) 2018-11-12
BR112016002953A2 (en) 2017-08-01
JP2016530441A (en) 2016-09-29
RU2016108869A3 (en) 2018-05-21
CA2920983C (en) 2021-05-25
FR3009740B1 (en) 2017-12-15
US10247039B2 (en) 2019-04-02
FR3009740A1 (en) 2015-02-20
EP3033495A1 (en) 2016-06-22
CA2920983A1 (en) 2015-02-19
CN105579670B (en) 2018-01-16
CN105579670A (en) 2016-05-11
BR112016002953A8 (en) 2020-02-04
WO2015022468A1 (en) 2015-02-19
US20160245122A1 (en) 2016-08-25

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