EP2576991B1 - Turbo machine with a device for preventing a segment of nozzle guide vanes assembly from rotating in a casing - Google Patents

Turbo machine with a device for preventing a segment of nozzle guide vanes assembly from rotating in a casing Download PDF

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Publication number
EP2576991B1
EP2576991B1 EP11728341.6A EP11728341A EP2576991B1 EP 2576991 B1 EP2576991 B1 EP 2576991B1 EP 11728341 A EP11728341 A EP 11728341A EP 2576991 B1 EP2576991 B1 EP 2576991B1
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EP
European Patent Office
Prior art keywords
casing
rotation
turbo machine
distributor
proofing
Prior art date
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Application number
EP11728341.6A
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German (de)
French (fr)
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EP2576991A1 (en
Inventor
Thierry Michel Breugnot
Didier Noël DURAND
Florence Irène Noëlle Leutard
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Safran Aircraft Engines SAS
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Safran Aircraft Engines SAS
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Publication of EP2576991A1 publication Critical patent/EP2576991A1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
    • F01D25/08—Cooling; Heating; Heat-insulation
    • 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
    • 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
    • F05D2230/00—Manufacture
    • F05D2230/60—Assembly methods
    • F05D2230/64—Assembly methods using positioning or alignment devices for aligning or centring, e.g. pins
    • F05D2230/642—Assembly methods using positioning or alignment devices for aligning or centring, e.g. pins using maintaining alignment while permitting differential dilatation
    • 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
    • F05D2240/11—Shroud seal segments
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2250/00—Geometry
    • F05D2250/70—Shape
    • 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
    • F05D2260/94—Functionality given by mechanical stress related aspects such as low cycle fatigue [LCF] of high cycle fatigue [HCF]
    • 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
    • F05D2260/94—Functionality given by mechanical stress related aspects such as low cycle fatigue [LCF] of high cycle fatigue [HCF]
    • F05D2260/941—Functionality given by mechanical stress related aspects such as low cycle fatigue [LCF] of high cycle fatigue [HCF] particularly aimed at mechanical or thermal stress reduction

Definitions

  • the present invention relates to the field of turbomachines and aims an annular distributor of axial turbine formed of distributor segments arranged in ring sectors.
  • the invention relates more particularly to a device for wedging in rotation of these sectors inside the housing.
  • a gas turbine engine as used in aeronautics comprises an upstream inlet through which air is sucked and then compressed while being guided through the compressor stages.
  • the compressed air is introduced into a combustion chamber where the fuel with which it is mixed is also admitted and where the combustion takes place.
  • the hot combustion gases are expanded in the various turbine stages, generally a high pressure stage immediately downstream of the chamber and receiving the gases at the highest temperature compatible with the holding of the materials. After this first expansion, the gases are expanded again by being guided through the so-called low pressure turbine stages.
  • a turbine stage includes a distributor wheel upstream of a turbine impeller.
  • An axial flow distributor wheel comprises a plurality of blades arranged radially with respect to the axis of the machine connecting a radially inner annular element and a radially outer annular element; the assembly forms an annular vein opposite the moving blades of a turbine wheel.
  • the movable wheel is itself constituted by blades extending radially from the rim of a disc or a drum movable about an axis of rotation. The blades are traversed axially by the engine gases.
  • the low pressure section of an engine thus generally comprises several turbine stages.
  • the distributor wheels are segmented into a plurality of sectors distributed around the axis of the machine, each segment being formed of a plurality of vanes between two ring sectors.
  • Each segment is mounted inside the turbine housing by the radially outer ring sector.
  • the latter comprises an upstream retaining means and a downstream retaining means.
  • These means are for example annular rails formed in the inner wall of the housing on which come bearing surfaces provided on the ring sectors of the distributor segments.
  • the assembly is arranged to allow the relative expansion of the distributor relative to the housing which is a function of the variations in speed of the machine. Due to the axial symmetry of the distributor wheels and the tangential forces resulting from the gas flow passing through them, it is necessary to provide locking means for rotating sectors.
  • the patent FR 2,743,603 in the name of SNECMA describes a method of mounting such distributor segments inside a housing.
  • the distributor segments comprise a peripheral outer rib, perpendicular to the axis of the distributor, supported by faces, one radially outer, the other downstream, on corresponding faces of the inner wall of the housing. Clamps, formed by the downstream turbine ring at this level, retain the segments and hold them in place against the radial movements.
  • a protrusion on the upstream face of the rib of each segment comprises a notch in which is housed an antirotation pin.
  • This pin consists of a head housed in said notch and a rod slid into a radial bore of the housing wall. This pin thus prevents any rotational movement of the distributor segment around the axis of the latter.
  • a sheet which is interposed between the segment and the inner wall of the housing.
  • This thermal protection plate is supported upstream against a radial surface portion formed in the inner wall of the housing.
  • the upstream edge of the protective sheet is bent radially inwards to form a pin which also bears on an upstream edge of the segment and participates in maintaining it against the upstream rail of the housing.
  • Downstream the protection plate comprises a notch with a tongue in the bottom of the notch which rests against the anti-rotation pin of the segment. The tongue is actually wedged in a thin groove of the pawn.
  • This assembly gives complete satisfaction in terms of maintaining the distributor inside the housing and the thermal protection thereof.
  • the present invention aims to remedy this problem.
  • the pin comprising a head housed in the notch of the segment and a rod coming into the housing formed on the housing, said surface portion is integral with the head of the antirotation pin.
  • This embodiment has the advantage of only involving the antirotation pin, the rest of the parts: distributor segment, thermal protection plate and housing remaining unchanged. This results in a significant economic advantage, the existing pawn being able to be replaced by the modified pawn without modifying the surrounding pieces.
  • This replacement can be carried out in nine as a preventive measure or during a repair.
  • said surface portion is constituted by a shoulder machined in the head of the anti-rotation pin; more particularly said portion of surface is formed by a lug extending parallel to the axis of the distributor and bearing against the inner wall of the housing.
  • the device of the invention finds an interesting application in the configuration described in the patent FR 2,743,603 , the distributor segment comprising a rib, perpendicular to the axis of the distributor, bearing against the inner wall of the housing and said notch is formed in a projection provided on one side of the rib.
  • the thermal protection plate is preferably in the form of a ring sector with a notch corresponding to said projection, the tongue being formed in the bottom of the notch. More particularly, the protective plate is disposed upstream with respect to the rib of the distributor segment and the antirotation pin.
  • the invention also relates to an antirotation pin suitable for use in the above device, the pin comprising a straight rod and a head with a first parallel face. to the axis of the rod and a surface portion perpendicular to said first face, on the opposite side to the rod.
  • the pin comprises a tab perpendicular to the axis of the right rod, said surface portion being formed on the tab.
  • the invention also relates to a gas turbine engine comprising a turbine stage with a device as described above.
  • a gas turbine engine 1 of the turbofan type comprises from upstream to downstream, here from left to right, a fan 2 with a low pressure compressor 3, a high pressure compressor 4, a combustion chamber 5, a high pressure turbine 6 and a low turbine pressure 7.
  • the low-pressure turbine 7 comprising several stages moving on the same rotor drives via a central shaft, the assembly formed by the fan 2 and the low-pressure compressor 3.
  • the high-pressure turbine 6 to a single stage independently drives the high pressure compressor 4.
  • FIG. 2 there is shown a partial view of the low pressure turbine section 7 at its outer circumference.
  • a distributor 8 or stator is upstream of a wheel with moving blades 9 inside the casing 10 of the turbine.
  • the moving wheel rotates about the axis of the machine inside a turbine ring 9 '.
  • the distributor 8 is formed of vanes arranged in a wheel divided into a plurality of segments 80 distributed circumferentially around the axis of the machine. Each segment 80 comprises several adjacent stationary vanes integral with a ring sector element 81.
  • the distributor segment 80 is held upstream by a rail-shaped rib 101 extending axially from the inner wall of the housing 10. ; an upstream hook 82 integral with the ring sector element 81 bears against the radially outer face of the rail 101.
  • the element 81 Downstream the element 81 comprises a peripheral radial rib 83, perpendicular to the axis of the distributor, which is supported by a radially outer face 83a and a downstream face 83b on corresponding faces of an annular rail 102 which extends axially from the inner wall of the housing 10 with a downstream edge turned towards the axis.
  • an antirotation pin 20 is housed in a radial bore of the housing 10.
  • the pin 20 is projecting inside the housing and is housed in a notch 83c machined in the rib 83 of the segment 80.
  • the rib forms at this level an overthickness 83 'in which the notch is machined.
  • the rib 83 forms a barrier to upstream gases; there is no communication between the area upstream of the rib 83 and the downstream zone.
  • the pin is fit tight in the housing bore but also in the notch 83c.
  • the notch is open upstream and is located at the center of the segment. In this way the segment 80 is held fixed in rotation relative to the housing while being able to expand circumferentially on either side of the pin and move axially to a certain extent.
  • a thermal protection plate 30 is disposed between the ring sector 81 of the segment 80 and the inner wall of the housing.
  • the sheet has a generally ring-shaped shape which upstream bears against a stop surface formed in the casing which may be at the level of the upstream rail 101. Downstream the protective plate 30 is cut into a notch along the contour of the projection 83 'of the rib. A tongue 30a in the bottom of the notch bears against the anti-rotation pin 20.
  • the sheet being slightly deformable a spring effect may be provided to ensure the maintenance of the sheet during operation of the turbomachine.
  • the figure 4 shows the anti-rotation counter of the prior art alone. It comprises a cylindrical rod 21 whose diameter allows a tight fit in the bore of the housing.
  • the pin comprises a head 22 forming the bar of a T with the rod 21. This head is of parallelepiped shape with two flanks 22a and 22b parallel to the axis of the rod 21 and between them.
  • the tongue 30a of the protective plate bears against the face perpendicular to the first two 22a and 22b, disposed upstream when the pin is in the notch 83c of the rib 83.
  • the antirotation counter has been modified.
  • the antirotation peg according to the invention bears the same references as the prior art pin to which 100 has been added.
  • This pawn 120 is visible on Figures 5 and 6 . It is similar to the pin 20 with a rod 121 a head 122 and flanks 122a and 122b. The dimensions are the same than that of the pin 20. It further comprises a tab 122c which extends perpendicular to the axis of the rod 121 and the width of the head 120. It is disposed between the rod and the head. Its thickness is calibrated.
  • the figure 5 shows the new pin 120 in position. As the pin 20 it ensures the rotation of the distributor relative to the housing 10. It should be noted that compared to the prior art only the pin has been modified. The other elements: distributor, sheet and housing are the same. The tongue is in abutment against the upstream side of the head 122 of the antirotation pin. The tab 122c resting against the housing forms a surface against which the downstream edge of the sheet is likely to abut. If a friction occurs during the operation of the turbomachine, the area impaired by wear will be the surface of the tab 122c turned inward; in repair, it will suffice if necessary to replace the pin 120 without having to reload the inner wall of the housing. The cost of repair will be greatly reduced.

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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

La présente invention concerne le domaine des turbomachines et vise un distributeur annulaire de turbine axiale formé de segments de distributeur disposés en secteurs d'anneau. L'invention concerne plus particulièrement un dispositif de calage en rotation de ces secteurs à l'intérieur du carter.The present invention relates to the field of turbomachines and aims an annular distributor of axial turbine formed of distributor segments arranged in ring sectors. The invention relates more particularly to a device for wedging in rotation of these sectors inside the housing.

Arrière plan de l'inventionBackground of the invention

Un moteur à turbine à gaz tel qu'utilisé en aéronautique comprend une entrée amont par laquelle l'air est aspiré puis comprimé en étant guidé à travers les étages de compresseur. L'air comprimé est introduit dans une chambre de combustion où est également admis le carburant avec lequel il est mélangé et où s'opère la combustion. Les gaz de combustion chauds sont détendus dans les différents étages de turbine dont généralement un étage à haute pression immédiatement en aval de la chambre et qui reçoit les gaz à la température la plus élevée compatible avec la tenue des matériaux. Après cette première détente les gaz sont détendus à nouveau en étant guidés à travers les étages de turbine dits à basse pression. Un étage de turbine comprend une roue de distributeurs en amont d'une roue mobile de turbine.A gas turbine engine as used in aeronautics comprises an upstream inlet through which air is sucked and then compressed while being guided through the compressor stages. The compressed air is introduced into a combustion chamber where the fuel with which it is mixed is also admitted and where the combustion takes place. The hot combustion gases are expanded in the various turbine stages, generally a high pressure stage immediately downstream of the chamber and receiving the gases at the highest temperature compatible with the holding of the materials. After this first expansion, the gases are expanded again by being guided through the so-called low pressure turbine stages. A turbine stage includes a distributor wheel upstream of a turbine impeller.

Une roue de distributeur à écoulement axial comprend une pluralité d'aubes disposées radialement par rapport à l'axe de la machine reliant un élément annulaire radialement interne et un élément annulaire radialement externe ; l'ensemble forme une veine annulaire en regard des aubes mobiles d'une roue de turbine. La roue mobile est elle-même constituée d'aubes s'étendant radialement depuis la jante d'un disque ou d'un tambour mobile autour d'un axe de rotation. Les aubes sont traversées axialement par les gaz moteurs. La section basse pression d'un moteur comprend ainsi généralement plusieurs étages de turbine.An axial flow distributor wheel comprises a plurality of blades arranged radially with respect to the axis of the machine connecting a radially inner annular element and a radially outer annular element; the assembly forms an annular vein opposite the moving blades of a turbine wheel. The movable wheel is itself constituted by blades extending radially from the rim of a disc or a drum movable about an axis of rotation. The blades are traversed axially by the engine gases. The low pressure section of an engine thus generally comprises several turbine stages.

Les roues de distributeurs sont segmentées en une pluralité de secteurs répartis autour de l'axe de la machine, chaque segment étant formé d'une pluralité d'aubes entre deux secteurs d'anneau. Chaque segment est monté à l'intérieur du carter de la turbine par le secteur d'anneau radialement extérieur. Ce dernier comprend un moyen de retenue amont et un moyen de retenue aval. Ces moyens sont par exemple des rails annulaires ménagés dans la paroi intérieure du carter sur lesquels viennent porter des surfaces d'appui ménagées sur les secteurs d'anneau des segments de distributeur. Le montage est agencé de manière à permettre la dilatation relative du distributeur par rapport au carter qui est fonction des variations de régime de la machine. En raison de la symétrie axiale des roues de distributeur et des efforts tangentiels résultant de l'écoulement gazeux qui les traverse, il est nécessaire de prévoir des moyens de blocage des secteurs en rotation.The distributor wheels are segmented into a plurality of sectors distributed around the axis of the machine, each segment being formed of a plurality of vanes between two ring sectors. Each segment is mounted inside the turbine housing by the radially outer ring sector. The latter comprises an upstream retaining means and a downstream retaining means. These means are for example annular rails formed in the inner wall of the housing on which come bearing surfaces provided on the ring sectors of the distributor segments. The assembly is arranged to allow the relative expansion of the distributor relative to the housing which is a function of the variations in speed of the machine. Due to the axial symmetry of the distributor wheels and the tangential forces resulting from the gas flow passing through them, it is necessary to provide locking means for rotating sectors.

Le brevet FR 2 743 603 au nom de SNECMA décrit un mode de montage de tels segments de distributeur à l'intérieur d'un carter. Les segments de distributeurs comprennent une nervure extérieure périphérique, perpendiculaire à l'axe du distributeur, s'appuyant par des faces, l'une radialement extérieure, l'autre aval, sur des faces correspondantes de la paroi intérieure du carter. Des pinces, formées par l'anneau de turbine aval à ce niveau, retiennent les segments et les retiennent en place contre les mouvements radiaux. Une saillie sur la face amont de la nervure de chaque segment comprend un cran dans lequel est logé un pion antirotation. Ce pion est constitué d'une tête logée dans ledit cran et une tige glissée dans un alésage radial de la paroi du carter. Ce pion empêche ainsi tout mouvement de rotation du segment de distributeur autour de l'axe de ce dernier.The patent FR 2,743,603 in the name of SNECMA describes a method of mounting such distributor segments inside a housing. The distributor segments comprise a peripheral outer rib, perpendicular to the axis of the distributor, supported by faces, one radially outer, the other downstream, on corresponding faces of the inner wall of the housing. Clamps, formed by the downstream turbine ring at this level, retain the segments and hold them in place against the radial movements. A protrusion on the upstream face of the rib of each segment comprises a notch in which is housed an antirotation pin. This pin consists of a head housed in said notch and a rod slid into a radial bore of the housing wall. This pin thus prevents any rotational movement of the distributor segment around the axis of the latter.

Afin de protéger la paroi du carter contre le rayonnement thermique produit par les segments de distributeur, on prévoit une tôle qui est interposée entre le segment et la paroi interne du carter. Cette tôle de protection thermique prend appui à l'amont contre une portion de surface radiale ménagée dans la paroi interne du carter. Le bord amont de la tôle de protection est recourbé radialement vers l'intérieur pour former une épingle qui prend appui également sur un bord amont du segment et participe au maintien de celui-ci contre le rail amont du carter. En aval la tôle de protection comprend une échancrure avec une languette dans le fond de l'échancrure qui s'appuie contre le pion antirotation du segment. La languette est en fait calée dans une fine rainure du pion.In order to protect the wall of the housing against the heat radiation produced by the distributor segments, there is provided a sheet which is interposed between the segment and the inner wall of the housing. This thermal protection plate is supported upstream against a radial surface portion formed in the inner wall of the housing. The upstream edge of the protective sheet is bent radially inwards to form a pin which also bears on an upstream edge of the segment and participates in maintaining it against the upstream rail of the housing. Downstream the protection plate comprises a notch with a tongue in the bottom of the notch which rests against the anti-rotation pin of the segment. The tongue is actually wedged in a thin groove of the pawn.

Ce montage donne entière satisfaction sur le plan du maintien du distributeur à l'intérieur du carter et de la protection thermique de celui-ci.This assembly gives complete satisfaction in terms of maintaining the distributor inside the housing and the thermal protection thereof.

On a constaté cependant que la tôle était susceptible de se dégager de son contact avec le pion antirotation, la languette sortant de la rainure de butée ménagée sur le pion. En n'étant pas retenue contre le pion, la partie aval de la tôle où se trouve la languette peut venir frotter contre la face interne de la paroi du carter, et rayer celui-ci. Il serait souhaitable d'éliminer ce risque d'usure du carter.It was found, however, that the sheet was likely to emerge from its contact with the antirotation pin, the tab out of the stop groove formed on the pin. By not being held against the counter, the downstream part of the sheet where is the tongue can come rub against the inner face of the housing wall, and scratch it. It would be desirable to eliminate this risk of crankcase wear.

Objet de l'inventionObject of the invention

La présente invention a pour objectif de remédier à ce problème.The present invention aims to remedy this problem.

Conformément à l'invention, on résout ce problème avec une turbomachine conforme à la revendication 1According to the invention, this problem is solved with a turbomachine according to claim 1

En interposant une butée entre le carter et la partie de la tôle susceptible de se déplacer pendant le fonctionnement de la machine, on élimine ainsi le risque de contact avec la paroi interne du carter.By interposing a stop between the housing and the part of the plate that can move during the operation of the machine, it eliminates the risk of contact with the inner wall of the housing.

Selon un mode de réalisation, le pion comprenant une tête logée dans le cran du segment et une tige venant dans le logement ménagé sur le carter, ladite portion de surface est solidaire de la tête du pion antirotation.According to one embodiment, the pin comprising a head housed in the notch of the segment and a rod coming into the housing formed on the housing, said surface portion is integral with the head of the antirotation pin.

Ce mode de réalisation présente l'avantage de ne concerner que le pion antirotation, le reste des pièces : segment de distributeur, tôle de protection thermique et carter restant inchangé. Il s'ensuit un avantage économique important, le pion existant pouvant être remplacé par le pion modifié sans modifier les pièces environnantes.This embodiment has the advantage of only involving the antirotation pin, the rest of the parts: distributor segment, thermal protection plate and housing remaining unchanged. This results in a significant economic advantage, the existing pawn being able to be replaced by the modified pawn without modifying the surrounding pieces.

Ce remplacement peut être effectué en neuf à titre préventif ou à l'occasion d'une réparation.This replacement can be carried out in nine as a preventive measure or during a repair.

Avantageusement, la dite portion de surface est constituée par un épaulement usiné dans la tête du pion antirotation ; plus particulièrement ladite portion de surface est formée par une patte s'étendant parallèlement à l'axe du distributeur et prenant appui contre la paroi interne du carter.Advantageously, said surface portion is constituted by a shoulder machined in the head of the anti-rotation pin; more particularly said portion of surface is formed by a lug extending parallel to the axis of the distributor and bearing against the inner wall of the housing.

Le dispositif de l'invention trouve une application intéressante dans la configuration décrite dans le brevet FR 2 743 603 , le segment de distributeur comprenant une nervure, perpendiculaire à l'axe du distributeur, prenant appui contre la paroi interne du carter et dont ledit cran est formé dans une saillie prévue sur un côté de la nervure. Alors, la tôle de protection thermique est de préférence en forme de secteur d'anneau avec une échancrure correspondant à ladite saillie, la languette étant ménagée dans le fond de l'échancrure. Plus particulièrement la tôle de protection est disposée en amont par rapport à la nervure du segment de distributeur et le pion antirotation.The device of the invention finds an interesting application in the configuration described in the patent FR 2,743,603 , the distributor segment comprising a rib, perpendicular to the axis of the distributor, bearing against the inner wall of the housing and said notch is formed in a projection provided on one side of the rib. Then, the thermal protection plate is preferably in the form of a ring sector with a notch corresponding to said projection, the tongue being formed in the bottom of the notch. More particularly, the protective plate is disposed upstream with respect to the rib of the distributor segment and the antirotation pin.

Dans la mesure où la caractéristique de l'invention vise le pion antirotation seul, l'invention porte également sur un pion antirotation apte à être utilisé dans le dispositif ci-dessus, le pion comprenant une tige droite et une tête avec une première face parallèle à l'axe de la tige et une portion de surface perpendiculaire à ladite première face, du côté opposé à la tige.Insofar as the characteristic of the invention is aimed at the antirotation pin alone, the invention also relates to an antirotation pin suitable for use in the above device, the pin comprising a straight rod and a head with a first parallel face. to the axis of the rod and a surface portion perpendicular to said first face, on the opposite side to the rod.

De préférence, le pion comprend une patte perpendiculaire à l'axe de la tige droite, ladite portion de surface étant ménagée sur la patte.Preferably, the pin comprises a tab perpendicular to the axis of the right rod, said surface portion being formed on the tab.

L'invention porte également sur un moteur à turbine à gaz comprenant un étage de turbine avec un dispositif tel que décrit ci-dessus.The invention also relates to a gas turbine engine comprising a turbine stage with a device as described above.

Brève description des figuresBrief description of the figures

L'invention va être décrite maintenant à l'aide des figures suivantes annexées à titre illustratif et non limitatif, parmi lesquelles

  • La figure 1 représente un exemple de moteur à turbine à gaz sur lequel s'applique l'invention ;
  • La figure 2 montre en coupe axiale une vue partielle d'un distributeur de turbine monté dans le carter d'un moteur à turbine à gaz selon l'art antérieur ;
  • La figure 3 est une vue en direction de l'axe du moteur du distributeur de la figure 2 avec une partie arrachée;
  • La figure 4 montre le pion antirotation de l'art antérieur ;
  • La figure 5 est une vue en coupe axiale correspondant à celle de la figure 2 avec la modification de l'invention ;
  • La figure 6 montre le pion antirotation de l'invention.
The invention will now be described with the aid of the following appended figures for illustrative and non-limiting purposes, among which:
  • The figure 1 represents an example of a gas turbine engine to which the invention applies;
  • The figure 2 shows in axial section a partial view of a turbine distributor mounted in the casing of a gas turbine engine according to the prior art;
  • The figure 3 is a view in the direction of the motor axis of the distributor of the figure 2 with a part torn off;
  • The figure 4 shows the anti-rotation counter of the prior art;
  • The figure 5 is an axial sectional view corresponding to that of the figure 2 with the modification of the invention;
  • The figure 6 shows the antirotation counter of the invention.

Description d'un mode de réalisationDescription of an embodiment

En se référant à la figure 1, on voit en coupe axiale un moteur à turbine à gaz 1 du type à turbosoufflante. Il comprend de l'amont vers l'aval, ici de la gauche vers la droite, une soufflante 2 avec un compresseur basse pression 3, un compresseur haute pression 4, une chambre de combustion 5, une turbine haute pression 6 et une turbine basse pression 7. La turbine basse pression 7 comprenant plusieurs étages mobiles sur un même rotor entraine par l'intermédiaire d'un arbre central, l'ensemble formé par la soufflante 2 et le compresseur basse pression 3. La turbine haute pression 6 à un seul étage entraîne de façon indépendante le compresseur haute pression 4.Referring to the figure 1 it is seen in axial section a gas turbine engine 1 of the turbofan type. It comprises from upstream to downstream, here from left to right, a fan 2 with a low pressure compressor 3, a high pressure compressor 4, a combustion chamber 5, a high pressure turbine 6 and a low turbine pressure 7. The low-pressure turbine 7 comprising several stages moving on the same rotor drives via a central shaft, the assembly formed by the fan 2 and the low-pressure compressor 3. The high-pressure turbine 6 to a single stage independently drives the high pressure compressor 4.

Sur la figure 2 on a représenté une vue partielle de la section de turbine basse pression 7 au niveau de sa circonférence extérieure. Un distributeur 8 ou stator est en amont d'une roue avec des aubes mobiles 9 à l'intérieur du carter 10 de la turbine. La roue mobile tourne autour de l'axe de la machine à l'intérieur d'un anneau de turbine 9'.On the figure 2 there is shown a partial view of the low pressure turbine section 7 at its outer circumference. A distributor 8 or stator is upstream of a wheel with moving blades 9 inside the casing 10 of the turbine. The moving wheel rotates about the axis of the machine inside a turbine ring 9 '.

Le distributeur 8 est formé d'aubes fixes disposées en une roue divisée en une pluralité de segments 80 répartis circonférentiellement autour de l'axe de la machine. Chaque segment 80 comprend plusieurs aubes fixes adjacentes solidaires d'un élément en secteur d'anneau 81. Le segment 80 de distributeur est maintenu à l'amont par une nervure en forme de rail 101 s'étendant axialement depuis la paroi interne du carter 10 ; un crochet amont 82 solidaire de l'élément en secteur d'anneau 81 est en appui contre la face radialement externe du rail 101. A l'aval l'élément 81 comprend une nervure radiale périphérique 83, perpendiculaire à l'axe du distributeur, qui s'appuie par une face radialement extérieure 83a et une face aval 83b sur des faces correspondantes d'un rail annulaire 102 qui s'étend axialement depuis la paroi intérieure du carter 10 avec un bord aval tourné vers l'axe.The distributor 8 is formed of vanes arranged in a wheel divided into a plurality of segments 80 distributed circumferentially around the axis of the machine. Each segment 80 comprises several adjacent stationary vanes integral with a ring sector element 81. The distributor segment 80 is held upstream by a rail-shaped rib 101 extending axially from the inner wall of the housing 10. ; an upstream hook 82 integral with the ring sector element 81 bears against the radially outer face of the rail 101. Downstream the element 81 comprises a peripheral radial rib 83, perpendicular to the axis of the distributor, which is supported by a radially outer face 83a and a downstream face 83b on corresponding faces of an annular rail 102 which extends axially from the inner wall of the housing 10 with a downstream edge turned towards the axis.

Comme on le voit également sur la figure 3, un pion antirotation 20 est logé dans un alésage radial du carter 10. Le pion 20 est en saillie à l'intérieur du carter et est logé dans un cran 83c usiné dans la nervure 83 du segment 80. Il est à noter que la nervure forme à ce niveau une surépaisseur 83' dans laquelle le cran est usiné. Comme cela est rapporté dans le brevet FR 2 743 603 , la nervure 83 forme barrière aux gaz situés en amont ; il n'y a pas de communication entre la zone située à l'amont de la nervure 83 et la zone située en aval. Le pion est ajusté serré dans l'alésage du carter mais aussi dans le cran 83c. Il comporte deux flancs 22a et 22b qui sont glissés entre les flancs du cran usinés parallèlement à l'axe du distributeur. Le cran est ouvert à l'amont et est situé au centre du segment. De cette manière le segment 80 est maintenu fixe en rotation par rapport au carter tout en pouvant se dilater circonférentiellement de part et d'autre du pion et se mouvoir axialement dans une certaine mesure.As we also see on the figure 3 , an antirotation pin 20 is housed in a radial bore of the housing 10. The pin 20 is projecting inside the housing and is housed in a notch 83c machined in the rib 83 of the segment 80. It should be noted that the rib forms at this level an overthickness 83 'in which the notch is machined. As reported in the patent FR 2,743,603 the rib 83 forms a barrier to upstream gases; there is no communication between the area upstream of the rib 83 and the downstream zone. The pin is fit tight in the housing bore but also in the notch 83c. It comprises two flanks 22a and 22b which are slid between the flanks of the notch machined parallel to the axis of the distributor. The notch is open upstream and is located at the center of the segment. In this way the segment 80 is held fixed in rotation relative to the housing while being able to expand circumferentially on either side of the pin and move axially to a certain extent.

Une tôle de protection thermique 30 est disposée entre le secteur d'anneau 81 du segment 80 et la paroi interne du carter. La tôle a une forme générale en secteur d'anneau qui à l'amont s'appuie contre une surface butée ménagée dans le carter qui peut être au niveau du rail amont 101. A l'aval la tôle de protection 30 est découpée en une échancrure suivant le contour de la saillie 83' de la nervure. Une languette 30a dans le fond de l'échancrure prend appui contre le pion antirotation 20. La tôle étant légèrement déformable un effet ressort peut être prévu pour assurer le maintien en place de la tôle lors du fonctionnement de la turbomachine.A thermal protection plate 30 is disposed between the ring sector 81 of the segment 80 and the inner wall of the housing. The sheet has a generally ring-shaped shape which upstream bears against a stop surface formed in the casing which may be at the level of the upstream rail 101. Downstream the protective plate 30 is cut into a notch along the contour of the projection 83 'of the rib. A tongue 30a in the bottom of the notch bears against the anti-rotation pin 20. The sheet being slightly deformable a spring effect may be provided to ensure the maintenance of the sheet during operation of the turbomachine.

La figure 4 montre le pion antirotation de l'art antérieur seul. Il comporte une tige 21 cylindrique dont le diamètre permet un ajustement serré dans l'alésage du carter. Le pion comprend une tête 22 formant la barre d'un T avec la tige 21. Cette tête est de forme parallélépipédique avec deux flancs 22a et 22b parallèles à l'axe de la tige 21 et entre eux. La languette 30a de la tôle de protection vient prendre appui contre la face perpendiculaire aux deux premières 22a et 22b, disposée à l'amont lorsque le pion est dans le cran 83c de la nervure 83.The figure 4 shows the anti-rotation counter of the prior art alone. It comprises a cylindrical rod 21 whose diameter allows a tight fit in the bore of the housing. The pin comprises a head 22 forming the bar of a T with the rod 21. This head is of parallelepiped shape with two flanks 22a and 22b parallel to the axis of the rod 21 and between them. The tongue 30a of the protective plate bears against the face perpendicular to the first two 22a and 22b, disposed upstream when the pin is in the notch 83c of the rib 83.

On a vu que cela n'était pas suffisant et que le bord aval de la tôle de protection était susceptible de venir frotter contre la face interne du carter, pouvant conduire à la formation de rainures indésirables.It has been seen that this was not enough and that the downstream edge of the protective plate could rub against the inner face of the casing, which could lead to the formation of undesirable grooves.

Conformément à l'invention, on a modifié le pion antirotation. Le pion antirotation selon l'invention porte les mêmes références que le pion de l'art antérieur auxquelles on a ajouté 100.According to the invention, the antirotation counter has been modified. The antirotation peg according to the invention bears the same references as the prior art pin to which 100 has been added.

Ce pion 120 est visible sur les figures 5 et 6. Il est semblable au pion 20 avec une tige 121 une tête 122 et des flancs 122a et 122b. Les dimensions sont les mêmes que celles du pion 20. Il comporte en plus une patte 122c qui s'étend perpendiculairement à l'axe de la tige 121 et sur la largeur de la tête 120. Elle est disposée entre la tige et la tête. Son épaisseur est calibrée.This pawn 120 is visible on Figures 5 and 6 . It is similar to the pin 20 with a rod 121 a head 122 and flanks 122a and 122b. The dimensions are the same than that of the pin 20. It further comprises a tab 122c which extends perpendicular to the axis of the rod 121 and the width of the head 120. It is disposed between the rod and the head. Its thickness is calibrated.

La figure 5 montre le nouveau pion 120 en position. Comme le pion 20 il assure le calage en rotation du distributeur par rapport au carter 10. Il est à noter que par rapport à l'art antérieur seul le pion a été modifié. Les autres éléments : distributeur, tôle et carter sont les mêmes. La languette est en appui contre le flanc amont de la tête 122 du pion antirotation. La patte 122c en appui contre le carter forme une surface contre laquelle le bord aval de la tôle est susceptible de venir buter. Si un frottement survient pendant le fonctionnement de la turbomachine, la surface altérée par l'usure sera la surface de la patte 122c tournée vers l'intérieur ; en réparation, il suffira le cas échéant de remplacer le pion 120 sans avoir à recharger la paroi interne du carter. Le coût de la réparation en sera fortement réduit.The figure 5 shows the new pin 120 in position. As the pin 20 it ensures the rotation of the distributor relative to the housing 10. It should be noted that compared to the prior art only the pin has been modified. The other elements: distributor, sheet and housing are the same. The tongue is in abutment against the upstream side of the head 122 of the antirotation pin. The tab 122c resting against the housing forms a surface against which the downstream edge of the sheet is likely to abut. If a friction occurs during the operation of the turbomachine, the area impaired by wear will be the surface of the tab 122c turned inward; in repair, it will suffice if necessary to replace the pin 120 without having to reload the inner wall of the housing. The cost of repair will be greatly reduced.

A titre préventif il est possible à l'occasion d'une visite de la machine de remplacer les pions antirotation existants 20 par les pions 120 de l'invention. La fonction antirotation est assurée de la même façon avec, en plus, une protection de la paroi interne du carter.As a preventive measure, it is possible during a visit of the machine to replace the existing anti-rotation pins 20 with the pins 120 of the invention. The antirotation function is ensured in the same way with, in addition, a protection of the inner wall of the housing.

Claims (8)

  1. A turbo machine comprising:
    - a ring-shaped casing (10) presenting an inside wall,
    - at least one distributor segment (80) forming a ring sector housed inside ring-shaped casing (10) and presenting an outside wall, each segment (80) including several adjacent fixed blades which are integral with the ring sector,
    - a heat shield sheet (30) interposed between the inside wall of the casing and the outside wall of the distributor segment (80),
    - a device for preventing the rotation of the distributor segment (80), the device comprising a rotation-proofing peg (120) mounted both at a radially inner end in a notch (83c) provided on the distributor segment (80) and at a radially outer end in a housing arranged on the casing wherein the rotation-proofing peg (120) is projecting,
    the heat shield sheet (30) including, at a downstream end, a tab (30a) bearing against the rotation-proofing peg (120), characterized in that the rotation-proofing peg includes a surface portion (122c) arranged radially between the tab (30a) and said inside wall of the casing, forming an abutment in the event of possible radial displacement of the heat shield sheet 30) during the operation of the turbo machine, the surface portion (122c) having an upper surface bearing against the inside wall of the casing and an upstream end being free of contact with the casing.
  2. The turbo machine as claimed in the preceding claim, the rotation-proofing peg (120) of which includes a head (122) housed in the notch (83c) of the distributor segment (80) and a rod (121) entering the housing arranged on the casing, said surface portion (122c) being integral with the head (122) of the rotation-proofing peg.
  3. The turbo machine as claimed in the preceding claim, said surface portion (122c) of which is constituted by a shoulder machined in the head of the rotation-proofing peg.
  4. The turbo machine as claimed in one of the preceding claims, said surface portion (122c) of which is formed by a lug parallel to the axis of the distributor and bearing against the inside wall of the casing.
  5. The turbo machine as claimed in one of the preceding claims, the distributor segment (80) including a rib (83) at right angles to the axis of the distributor and bearing against the inside wall of the casing, said notch (83c) of which is formed in a protrusion (83') provided on one side of the rib (83).
  6. The turbo machine as claimed in the preceding claim, the heat shield sheet (30) of which is in the form of a ring sector with an indentation corresponding to said protrusion (83'), the tab (30a) being arranged in the bottom of the indentation.
  7. The turbo machine as claimed in either of claims 5 and 6, the shield sheet (30) of which is provided upstream with regard to the rib (83) of the distributor segment (80) and the rotation-proofing peg (120).
  8. The turbo machine as claimed in one of the preceding claims, wherein the rotation-proofing peg (120) is removable.
EP11728341.6A 2010-06-01 2011-05-31 Turbo machine with a device for preventing a segment of nozzle guide vanes assembly from rotating in a casing Active EP2576991B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1054263A FR2960591B1 (en) 2010-06-01 2010-06-01 DEVICE FOR ROTATING A DISPENSING SEGMENT IN A TURBOMACHINE HOUSING; PION ANTIROTATION
PCT/FR2011/051251 WO2011151596A1 (en) 2010-06-01 2011-05-31 Turbo machine with a device for preventing a segment of nozzle guide vanes assembly from rotating in a casing; rotation-proofing peg

Publications (2)

Publication Number Publication Date
EP2576991A1 EP2576991A1 (en) 2013-04-10
EP2576991B1 true EP2576991B1 (en) 2017-01-25

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EP11728341.6A Active EP2576991B1 (en) 2010-06-01 2011-05-31 Turbo machine with a device for preventing a segment of nozzle guide vanes assembly from rotating in a casing

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US (1) US9562441B2 (en)
EP (1) EP2576991B1 (en)
JP (1) JP5796066B2 (en)
CN (1) CN102918230B (en)
BR (1) BR112012029475A2 (en)
CA (1) CA2800262A1 (en)
FR (1) FR2960591B1 (en)
RU (1) RU2558174C2 (en)
WO (1) WO2011151596A1 (en)

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FR2985792B1 (en) * 2012-01-18 2014-02-07 Snecma ANGLE CORRELATION VIBRATION DAMPING RECTIFIER SECTOR FOR TURBOMACHINE COMPRESSOR
US9051849B2 (en) * 2012-02-13 2015-06-09 United Technologies Corporation Anti-rotation stator segments
FR2989724B1 (en) * 2012-04-20 2015-12-25 Snecma TURBINE STAGE FOR A TURBOMACHINE
US10240467B2 (en) * 2012-08-03 2019-03-26 United Technologies Corporation Anti-rotation lug for a gas turbine engine stator assembly
FR2995340A1 (en) * 2012-09-12 2014-03-14 Snecma THERMAL PROTECTION COVER WITH RADIAL STOVE, IN PARTICULAR FOR TURBOMACHINE DISPENSER
FR3002272A1 (en) 2013-02-19 2014-08-22 Snecma ANTI-ROTATION DISTRIBUTOR SECTOR FOR ADJACENT AREA
FR3003894B1 (en) * 2013-03-29 2017-10-27 Snecma ROTATING LOCKING MEMBER FOR A DISTRIBUTOR AND A RING OF A TURBOMACHINE
FR3039201B1 (en) * 2015-07-22 2017-07-21 Snecma THERMAL PROTECTION TURBOMACHINE PART HAVING PINS
US10280773B2 (en) 2016-04-06 2019-05-07 General Electric Company Turbomachine alignment key and related turbomachine
FR3069014B1 (en) * 2017-07-11 2021-02-26 Safran Aircraft Engines SPRING SHEET TURBOMACHINE PART
FR3085412B1 (en) 2018-08-31 2020-12-04 Safran Aircraft Engines TURBOMACHINE DISTRIBUTOR AREA INCLUDING AN ANTI-ROTATION NOTCH WITH WEAR INSERT
FR3096397B1 (en) * 2019-05-21 2021-04-16 Safran Aircraft Engines REMOVABLE PIONE ON TURBOMACHINE DISTRIBUTOR
GB2588929B (en) * 2019-11-14 2023-09-27 Cummins Ltd Pin member for turbine
CN117569923B (en) * 2024-01-12 2024-04-05 成都中科翼能科技有限公司 Turbine fulcrum structure of gas turbine

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CA2800262A1 (en) 2011-12-08
RU2012152657A (en) 2014-07-20
BR112012029475A2 (en) 2017-01-24
CN102918230B (en) 2015-08-26
WO2011151596A1 (en) 2011-12-08
US9562441B2 (en) 2017-02-07
CN102918230A (en) 2013-02-06
US20130078086A1 (en) 2013-03-28
RU2558174C2 (en) 2015-07-27
EP2576991A1 (en) 2013-04-10
FR2960591B1 (en) 2012-08-24
FR2960591A1 (en) 2011-12-02
JP5796066B2 (en) 2015-10-21
JP2013531165A (en) 2013-08-01

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