EP3553281B1 - Device for masking a perimeter inside a turbine engine disc - Google Patents

Device for masking a perimeter inside a turbine engine disc Download PDF

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Publication number
EP3553281B1
EP3553281B1 EP19165172.8A EP19165172A EP3553281B1 EP 3553281 B1 EP3553281 B1 EP 3553281B1 EP 19165172 A EP19165172 A EP 19165172A EP 3553281 B1 EP3553281 B1 EP 3553281B1
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EP
European Patent Office
Prior art keywords
seal
disc
radially
inner periphery
upper element
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
EP19165172.8A
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German (de)
French (fr)
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EP3553281A1 (en
Inventor
Nicolas Léon Jean-Baptiste BESNARD
Romain Jean-François GUERIT
Laurent Miguel SANCHEZ
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
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Safran Aircraft Engines SAS
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Publication date
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Publication of EP3553281A1 publication Critical patent/EP3553281A1/en
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Publication of EP3553281B1 publication Critical patent/EP3553281B1/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
    • F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
    • F01D5/12—Blades
    • F01D5/28—Selecting particular materials; Particular measures relating thereto; Measures against erosion or corrosion
    • F01D5/288—Protective coatings for blades
    • 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
    • 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
    • F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
    • F01D5/12—Blades
    • F01D5/28—Selecting particular materials; Particular measures relating thereto; Measures against erosion or corrosion
    • F01D5/286—Particular treatment of blades, e.g. to increase durability or resistance against corrosion or erosion
    • 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
    • F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
    • F01D11/003—Preventing or minimising internal leakage of working-fluid, e.g. between stages by packing rings; Mechanical seals
    • 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
    • F01D25/002—Cleaning of turbomachines
    • 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
    • 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
    • F05D2230/90—Coating; Surface treatment
    • 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
    • F05D2300/00—Materials; Properties thereof
    • F05D2300/60—Properties or characteristics given to material by treatment or manufacturing
    • F05D2300/611—Coating

Definitions

  • the present invention relates to a device for masking an internal periphery of a turbomachine disc, such as a sealing flange of a high pressure compressor disc. It also relates to a method for cleaning the disc using the device.
  • the state of the art includes in particular the document FR-A1-3 014 944 .
  • a step is carried out of mounting blades on the periphery of a turbomachine disk.
  • the disc is a rotating part of the turbomachine attached to the low pressure shaft or to the high pressure shaft of the turbomachine.
  • the vanes, once mounted on the disc, allow the transfer of energy between the primary flow and one of these shafts.
  • the disc may comprise in a radially inner region a sealing flange which is intended to bear on a part, for example on a bearing secured to an inner sealing casing. Since this is an area in which there are significant contacts, the sealing flange is made of a wear resistant material.
  • the sealing flange may for example be covered with a resistant alloy such as the cobalt-chromium-molybdenum alloy sold under the name Tribaloy® T-800 by the company Kennametal.
  • the disc is dismantled and subjected to a cleaning operation. Cleaning can involve several baths, some of which may damage the tough material of the disc sealing flange.
  • CMR agents chemical agents which, however, have, in the medium or long term, carcinogenic, mutagenic or toxic effects for reproduction.
  • Another solution could be to apply a metallic material to the strong material of the sealing flange of the disc, but this solution does not allow to adapt to dimensional variations of the flange due to the normal operation of the flange in flight. .
  • the present invention aims to remedy these drawbacks, by proposing a device for masking an inner periphery of a turbomachine disk which makes it possible to effectively hide the inner element, while respecting the SSE rules (safety, health, environment). .
  • the subject of the invention is thus a device for masking an inner periphery of a turbomachine disk.
  • the flexible seal makes it possible to adapt to deformations of the inner periphery.
  • the central part of the seal forming a return element makes it possible to compress the seal which thus follows and absorbs the deformations of the periphery.
  • Masking of the perimeter is carried out in a simple manner, the seal radially and longitudinally surrounding each longitudinal end of the perimeter.
  • the device makes it possible to hide the perimeter and allow the cleaning liquid to pass through the middle of the device.
  • the central part of the seal may have a V-shaped section of revolution.
  • the lower part and the upper part of the seal advantageously have a section of revolution comprising a portion of radial orientation and a portion of longitudinal orientation, which makes it possible to rest longitudinally and radially outwardly on each longitudinal end of the periphery. inside the disc.
  • the lower part may have a bevelled section of revolution, a radially inner portion of which is intended to rest on a frustoconical surface of the lower element and a radially outer portion is intended to rest on a lower end of the inner periphery of the disc.
  • the upper part may have an L-shaped or T-shaped section of revolution, a radially inner portion of which is intended to rest on a shoulder of the upper element and a radially outer portion is intended to rest on an upper end. the inner perimeter of the disc.
  • the lower element and the upper element can be cylindrical plates.
  • the lower element and the upper element may include orifices for circulation of a cleaning liquid.
  • the tightening system may comprise a threaded rod integral with the lower element and passing through the seal and the upper element, and a nut bearing on the upper element.
  • Another subject of the invention is a turbomachine disk.
  • the disc according to the invention is provided with a device described above.
  • the inner rim may be a layer of sealing flange material.
  • the subject of the invention is also a method of masking an inner periphery of a turbomachine disk.
  • the method according to the invention uses a device described above.
  • the method may comprise, after the tightening step, a step of cleaning the disc.
  • a device 1 for masking an internal element of a turbomachine disk comprises a lower element 2, a seal 3, an upper element 4, and a nut 5.
  • the seal seal 3 is intended to be sandwiched between the lower element 2 and the upper element 4.
  • the lower element 2, the seal 3, the upper element 4, and the nut 5 are coaxial with longitudinal axis X.
  • the lower element 2, the seal 3 and the upper element 4 are also substantially of the same diameter.
  • the upper element 4 is in the form of a circular plate provided with orifices 4a, for example cylindrical, allowing the circulation of the cleaning product.
  • Guide elements 4b for example in the form of cylindrical rods, make it possible to guide the upper element 4 in the lower element 2 and to secure it to the latter.
  • the upper element 4 is typically made of stainless steel.
  • the lower element 2 is also in the form of a circular plate provided with orifices 2a which are distributed in the same way as the orifices 4a of the upper element 4, so as to be able to be arranged opposite each other. screws of the holes 4a when the guide elements 4b are introduced into the receiving elements 2b of the lower element 2.
  • the receiving elements 2b are for example cylindrical through orifices.
  • the lower element 2 also comprises a threaded rod 2c, coming from the thickness of the lower element 2 and directed upwards of the lower element 2 and which is intended to pass through the upper element 4 via a through hole 4c of the upper element 4.
  • the threaded rod 2c can come from a central base 2d which projects from the surface of the lower element 2.
  • the lower element 2 can also comprise one or more rods 2e directed towards the bottom of the lower element 2 and which are intended to be positioned on a support table, not shown, of the masking device 1.
  • the lower element 2 is typically made of stainless steel, covered with polytetrafluoroethylene (PTFE).
  • the nut 5 cooperates with the threaded rod 2c to tighten the assembly and keep the seal 3 in contact with the lower element 2 and with the upper element 4.
  • the nut 5 comprises a base 5a which comes lean on the upper element 4, around the hole 4c. It is also possible to envisage any fastening element which makes it possible to clamp the seal 3 between the upper element 4 and the lower element 2, such as, for example, a setting in compression using clamps or the using a pinned axle.
  • the seal 3 has a specific shape which will be described in connection with the figures 2 and 3 . It is made of an elastic material, typically a silicone elastomer, which allows good immersion in acid baths.
  • the figures 2 and 3 illustrate the turbomachine disk 6, provided with the masking device 1.
  • the disc 6 is typically a high pressure compressor disc.
  • the disc 6 comprises a radially internal solid part 6a, located radially on the side of a central bore 7 of the disc 6.
  • the solid part 6a is provided at its radially internal end with an annular sealing flange 6b, which is slightly eccentric. relative to the plane of the disc 6 and which extends longitudinally.
  • the terms “radial” and “longitudinal” are defined with respect to the axis of X symmetry of disc 6 (and of device 1) which is perpendicular to the plane of disc 6.
  • the sealing flange 6b is intended to come to rest on a bearing secured to an internal sealing casing. Since this is an area in which there are significant contacts, the sealing flange 6b is made of a wear resistant material.
  • the sealing flange 6b can thus be coated with an annular layer 6b1 of resistant material, such as for example a resistant alloy such as the cobalt-chromium-molybdenum alloy sold under the name Tribaloy® T-800 by the company Kennametal.
  • the masking device 1 thus has the function of protecting the layer 6b1 of resistant material from the action of the cleaning baths used during the operation of cleaning the disc 6. It is more precisely the seal 3 which ensures this masking function.
  • the seal 3 is annular in shape, it is a solid of revolution around the axis X obtained from a section comprising an upper part 3a intended to bear against the upper element 4 of the device 1 masking and a lower part 3b intended to bear against the lower element 2.
  • the upper part 3a is also intended to bear against an upper longitudinal end of the layer 6b1 of resistant material, while the lower part 3b is also intended to bear against a lower longitudinal end of the layer 6b1 of resistant material.
  • the upper part 3a and the lower part 3b are interconnected by a central part 3c forming a return element.
  • the central part 3c is typically V-shaped.
  • the upper part 3a of the seal 3 bears radially inwardly against a shoulder of the upper element 4.
  • the shoulder is formed by the difference in external diameter between an upper cylindrical portion 4d of the upper element 4 and a lower cylindrical portion 4th of the upper element 4.
  • the cylindrical portion upper 4d is of greater diameter than that of the lower cylindrical portion 4e.
  • the lower part 3b of the seal 3 for its part bears radially inwardly on a frustoconical upper part 2f of the lower element 2.
  • the lower part 3b of the seal 3 is advantageously bevelled to facilitate the support of the lower part 3b on the frustoconical upper part 2f of the lower element 2.
  • the seal 3 is advantageously configured to match the contour of the longitudinal ends of the layer 6b1 of resistant material, both radially and longitudinally.
  • the upper part 3a of the seal 3 advantageously follows the contour of the upper longitudinal end of the layer 6b1
  • the lower part 3b of the seal 3 advantageously follows the contour of the lower longitudinal end of the layer 6b1 of resistant material, which makes it possible to mask the layer 6b1 of resistant material and to prevent it from coming into contact with the cleaning product which circulates in the center of the device 1.
  • the seal 3 therefore covers radially and longitudinally each longitudinal end of the layer 6b1 and the V-shaped return portion is disposed internally at the central part of the layer 6b1, located between its two longitudinal ends.
  • the seal 3 thus forms a shoulder in which each longitudinal end of the layer 6b1 fits.
  • the particular shape of the seal 3 thus makes it possible to seal an inner periphery (the layer 6b1 of resistant material of the sealing flange 6b) of the disc 6. Its geometry with the return element, for example V-shaped example ensures a compression zone on each lower and upper side.
  • the compressions are carried out by the lower 2 and upper 4 elements of the device 1 which are typically metallic elements.
  • the directions of compression of the seal 3 are shown in figure 3 by arrows F.
  • the particular shape of the seal 3 makes it possible to best adapt to the contact surfaces of the sealing flange 6b and to the lower 2 and upper 4 elements.

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

Description

DOMAINE TECHNIQUETECHNICAL AREA

La présente invention a pour objet un dispositif de masquage d'un pourtour intérieur d'un disque de turbomachine, tel qu'une bride d'étanchéité d'un disque de compresseur haute pression. Elle a également pour objet un procédé de nettoyage du disque mettant en œuvre le dispositif.The present invention relates to a device for masking an internal periphery of a turbomachine disc, such as a sealing flange of a high pressure compressor disc. It also relates to a method for cleaning the disc using the device.

ETAT DE L'ARTSTATE OF THE ART

L'état de la technique comprend notamment le document FR-A1-3 014 944 .The state of the art includes in particular the document FR-A1-3 014 944 .

Dans le cadre de l'assemblage des pièces d'une turbomachine, on effectue une étape de montage d'aubes en périphérie d'un disque de turbomachine. Le disque est une pièce rotative de la turbomachine rattachée à l'arbre basse pression ou à l'arbre haute pression de la turbomachine. Les aubes, une fois montées sur le disque, permettent le transfert d'énergie entre le flux primaire et l'un de ces arbres.As part of the assembly of the parts of a turbomachine, a step is carried out of mounting blades on the periphery of a turbomachine disk. The disc is a rotating part of the turbomachine attached to the low pressure shaft or to the high pressure shaft of the turbomachine. The vanes, once mounted on the disc, allow the transfer of energy between the primary flow and one of these shafts.

Le disque peut comprendre dans une zone radialement intérieure une bride d'étanchéité qui est destinée à être en appui sur une pièce, par exemple sur un roulement solidaire d'un carter intérieur d'étanchéité. Comme il s'agit d'une zone dans laquelle il y a des contacts importants, la bride d'étanchéité est réalisée en un matériau résistant à l'usure. La bride d'étanchéité peut par exemple être recouverte d'un alliage résistant tel que l'alliage cobalt-chrome-molybdène commercialisé sous la dénomination Tribaloy® T-800 par la société Kennametal.The disc may comprise in a radially inner region a sealing flange which is intended to bear on a part, for example on a bearing secured to an inner sealing casing. Since this is an area in which there are significant contacts, the sealing flange is made of a wear resistant material. The sealing flange may for example be covered with a resistant alloy such as the cobalt-chromium-molybdenum alloy sold under the name Tribaloy® T-800 by the company Kennametal.

Lors de la maintenance et/ou de la réparation du disque, avant l'inspection de la pièce, on démonte le disque et on le soumet à une opération de nettoyage. Le nettoyage peut mettre en œuvre plusieurs bains, dont certains sont susceptibles d'endommager le matériau résistant de la bride d'étanchéité du disque.During maintenance and / or repair of the disc, before inspection of the part, the disc is dismantled and subjected to a cleaning operation. Cleaning can involve several baths, some of which may damage the tough material of the disc sealing flange.

Il a pu être préconisé d'utiliser, pour le masquage, des agents chimiques qui ont toutefois, à moyen ou long terme, des effets cancérogènes, mutagènes ou toxiques pour la reproduction. Ces agents sont appelés agents CMR.It has been possible to recommend the use, for masking, of chemical agents which, however, have, in the medium or long term, carcinogenic, mutagenic or toxic effects for reproduction. These agents are called CMR agents.

Une autre solution pourrait être d'appliquer un matériau métallique sur le matériau résistant de la bride d'étanchéité du disque, mais cette solution ne permet pas de s'adapter à des variations dimensionnelles de la bride dues au fonctionnement normal de la bride en vol.Another solution could be to apply a metallic material to the strong material of the sealing flange of the disc, but this solution does not allow to adapt to dimensional variations of the flange due to the normal operation of the flange in flight. .

La présente invention vise à remédier à ces inconvénients, en proposant un dispositif de masquage d'un pourtour intérieur d'un disque de turbomachine qui permet de masquer efficacement l'élément intérieur, tout en respectant les règles SSE (sécurité, santé, environnement).The present invention aims to remedy these drawbacks, by proposing a device for masking an inner periphery of a turbomachine disk which makes it possible to effectively hide the inner element, while respecting the SSE rules (safety, health, environment). .

EXPOSE DE L'INVENTIONDISCLOSURE OF THE INVENTION

L'invention a ainsi pour objet un dispositif de masquage d'un pourtour intérieur d'un disque de turbomachine.The subject of the invention is thus a device for masking an inner periphery of a turbomachine disk.

Le dispositif selon l'invention comprend :

  • un élément inférieur, d'axe longitudinal,
  • un élément supérieur, d'axe longitudinal,
  • un joint annulaire élastique d'étanchéité, d'axe longitudinal, l'élément inférieur, l'élément supérieur et le joint d'étanchéité étant coaxiaux, le joint d'étanchéité étant disposé longitudinalement entre l'élément inférieur et l'élément supérieur, le joint d'étanchéité comprenant une partie inférieure annulaire s'appuyant radialement intérieurement sur l'élément inférieur, une partie supérieure annulaire s'appuyant radialement intérieurement sur l'élément supérieur, la partie inférieure et la partie supérieure étant reliées entre elles par une partie centrale annulaire formant élément de rappel, ledit joint d'étanchéité étant en outre configuré pour s'appuyer longitudinalement et radialement extérieurement sur chaque extrémité longitudinale dudit pourtour intérieur du disque, de manière à masquer ledit pourtour intérieur, et
  • un système de serrage, apte à serrer le joint d'étanchéité entre l'élément inférieur et l'élément supérieur.
The device according to the invention comprises:
  • a lower element, with a longitudinal axis,
  • an upper element, with a longitudinal axis,
  • an elastic annular seal, of longitudinal axis, the lower element, the upper element and the seal being coaxial, the seal being disposed longitudinally between the lower element and the upper element, the seal comprising an annular lower part resting radially inwardly on the lower element, an annular upper part resting radially inwardly on the upper element, the lower part and the upper part being interconnected by a part annular central forming a return element, said seal being further configured to bear longitudinally and radially outwardly on each longitudinal end of said inner periphery of the disc, so as to mask said inner periphery, and
  • a clamping system suitable for clamping the seal between the lower element and the upper element.

Ainsi, le joint souple permet de s'adapter à des déformations du pourtour intérieur. La partie centrale du joint formant élément de rappel permet de comprimer le joint qui épouse ainsi et absorbe les déformations du pourtour. Le masquage du pourtour s'effectue de manière simple, le joint entourant radialement et longitudinalement chaque extrémité longitudinale du pourtour. Le dispositif permet de masquer le pourtour et de laisser passer le liquide de nettoyage au milieu du dispositif.Thus, the flexible seal makes it possible to adapt to deformations of the inner periphery. The central part of the seal forming a return element makes it possible to compress the seal which thus follows and absorbs the deformations of the periphery. Masking of the perimeter is carried out in a simple manner, the seal radially and longitudinally surrounding each longitudinal end of the perimeter. The device makes it possible to hide the perimeter and allow the cleaning liquid to pass through the middle of the device.

La partie centrale du joint d'étanchéité peut présenter une section de révolution en forme de V.The central part of the seal may have a V-shaped section of revolution.

La partie inférieure et la partie supérieure du joint d'étanchéité présentent avantageusement une section de révolution comprenant une portion d'orientation radiale et une portion d'orientation longitudinale, ce qui permet de s'appuyer longitudinalement et radialement extérieurement sur chaque extrémité longitudinale du pourtour intérieur du disque.The lower part and the upper part of the seal advantageously have a section of revolution comprising a portion of radial orientation and a portion of longitudinal orientation, which makes it possible to rest longitudinally and radially outwardly on each longitudinal end of the periphery. inside the disc.

La partie inférieure peut présenter une section de révolution biseautée dont une portion radialement intérieure est destinée à s'appuyer sur une surface tronconique de l'élément inférieur et une portion radialement extérieure est destinée à s'appuyer sur une extrémité inférieure du pourtour intérieur du disque.The lower part may have a bevelled section of revolution, a radially inner portion of which is intended to rest on a frustoconical surface of the lower element and a radially outer portion is intended to rest on a lower end of the inner periphery of the disc. .

La partie supérieure peut présenter une section de révolution en forme de L ou de T dont une portion radialement intérieure est destinée à s'appuyer sur un épaulement de l'élément supérieur et une portion radialement extérieure est destinée à s'appuyer sur une extrémité supérieure du pourtour intérieur du disque.The upper part may have an L-shaped or T-shaped section of revolution, a radially inner portion of which is intended to rest on a shoulder of the upper element and a radially outer portion is intended to rest on an upper end. the inner perimeter of the disc.

L'élément inférieur et l'élément supérieur peuvent être des plateaux cylindriques.The lower element and the upper element can be cylindrical plates.

L'élément inférieur et l'élément supérieur peuvent comprendre des orifices de circulation d'un liquide de nettoyage.The lower element and the upper element may include orifices for circulation of a cleaning liquid.

Le système de serrage peut comprendre une tige filetée solidaire de l'élément inférieur et traversant le joint d'étanchéité et l'élément supérieur, et un écrou prenant appui sur l'élément supérieur.The tightening system may comprise a threaded rod integral with the lower element and passing through the seal and the upper element, and a nut bearing on the upper element.

L'invention a également pour objet un disque de turbomachine.Another subject of the invention is a turbomachine disk.

Le disque selon l'invention est muni d'un dispositif décrit ci-dessus.The disc according to the invention is provided with a device described above.

Le pourtour intérieur peut être une couche de matériau d'une bride d'étanchéité.The inner rim may be a layer of sealing flange material.

L'invention a également pour objet un procédé de masquage d'un pourtour intérieur d'un disque de turbomachine.The subject of the invention is also a method of masking an inner periphery of a turbomachine disk.

Le procédé selon l'invention met en œuvre un dispositif décrit ci-dessus.The method according to the invention uses a device described above.

Le procédé peut en particulier comprendre les étapes suivantes :

  • une étape de mise en place de l'élément inférieur dans un alésage central du disque,
  • une étape de mise en place du joint d'étanchéité sur le pourtour intérieur à masquer, la partie inférieure du joint d'étanchéité s'appuyant radialement intérieurement sur l'élément inférieur,
  • une étape de mise en place de l'élément supérieur, un épaulement de l'élément supérieur étant disposé sur la partie supérieure du joint d'étanchéité, et
  • une étape de serrage à l'aide du système de serrage, l'élément inférieur translatant dans l'alésage lors du serrage de manière à venir comprimer la partie inférieure du joint d'étanchéité.
The method can in particular comprise the following steps:
  • a step of placing the lower element in a central bore of the disc,
  • a step of fitting the seal around the inner periphery to be masked, the lower part of the seal resting radially inwardly on the lower element,
  • a step of positioning the upper element, a shoulder of the upper element being disposed on the upper part of the seal, and
  • a tightening step using the tightening system, the lower element translating in the bore during tightening so as to compress the lower part of the seal.

Le procédé peut comprendre, après l'étape de serrage, une étape de nettoyage du disque.The method may comprise, after the tightening step, a step of cleaning the disc.

DESCRIPTION DES FIGURESDESCRIPTION OF FIGURES

L'invention sera mieux comprise et d'autres détails, caractéristiques et avantages de l'invention apparaîtront à la lecture de la description suivante faite à titre d'exemple non limitatif et en référence aux dessins annexés dans lesquels :

  • la figure 1 représente en perspective éclatée un dispositif de masquage d'un pourtour intérieur d'un disque de turbomachine selon l'invention,
  • la figure 2 est une vue en coupe d'un disque de turbomachine muni du dispositif de la figure 1,
  • la figure 3 est une vue partielle de détail de la figure 2, et
  • la figure 4 est une vue partielle de dessus et en perspective du disque de la figure 2.
The invention will be better understood and other details, characteristics and advantages of the invention will appear on reading the description. following given by way of non-limiting example and with reference to the appended drawings in which:
  • the figure 1 shows in exploded perspective a device for masking an inner periphery of a turbomachine disc according to the invention,
  • the figure 2 is a sectional view of a turbomachine disc fitted with the device of the figure 1 ,
  • the figure 3 is a partial detail view of the figure 2 , and
  • the figure 4 is a partial view from above and in perspective of the disc of the figure 2 .

DESCRIPTION DETAILLEEDETAILED DESCRIPTION

Tel qu'illustré à la figure 1, un dispositif 1 de masquage d'un élément intérieur d'un disque de turbomachine selon l'invention comprend un élément inférieur 2, un joint d'étanchéité 3, un élément supérieur 4, ainsi qu'un écrou 5. Le joint d'étanchéité 3 est destiné à être pris en sandwich entre l'élément inférieur 2 et l'élément supérieur 4. L'élément inférieur 2, le joint d'étanchéité 3, l'élément supérieur 4, et l'écrou 5 sont coaxiaux d'axe longitudinal X. L'élément inférieur 2, le joint d'étanchéité 3 et l'élément supérieur 4 sont en outre sensiblement de même diamètre.As illustrated on figure 1 , a device 1 for masking an internal element of a turbomachine disk according to the invention comprises a lower element 2, a seal 3, an upper element 4, and a nut 5. The seal seal 3 is intended to be sandwiched between the lower element 2 and the upper element 4. The lower element 2, the seal 3, the upper element 4, and the nut 5 are coaxial with longitudinal axis X. The lower element 2, the seal 3 and the upper element 4 are also substantially of the same diameter.

L'élément supérieur 4 se présente sous la forme d'un plateau circulaire muni d'orifices 4a, par exemple cylindriques, permettant la circulation du produit de nettoyage. Des éléments de guidage 4b, par exemple sous la forme de tiges cylindriques, permettent de guider l'élément supérieur 4 dans l'élément inférieur 2 et de le solidariser à ce dernier. L'élément supérieur 4 est typiquement réalisé en acier inoxydable.The upper element 4 is in the form of a circular plate provided with orifices 4a, for example cylindrical, allowing the circulation of the cleaning product. Guide elements 4b, for example in the form of cylindrical rods, make it possible to guide the upper element 4 in the lower element 2 and to secure it to the latter. The upper element 4 is typically made of stainless steel.

L'élément inférieur 2 se présente également sous la forme d'un plateau circulaire muni d'orifices 2a qui sont répartis de la même manière que les orifices 4a de l'élément supérieur 4, de manière à pouvoir être disposés en vis-à-vis des orifices 4a lorsque les éléments de guidages 4b sont introduits dans des éléments de réception 2b de l'élément inférieur 2. Les éléments de réception 2b sont par exemple des orifices traversant cylindriques. L'élément inférieur 2 comprend également une tige filetée 2c, issue de l'épaisseur de l'élément inférieur 2 et dirigée vers le haut de l'élément inférieur 2 et qui est destinée à traverser l'élément supérieur 4 via un orifice traversant 4c de l'élément supérieur 4. La tige filetée 2c peut être issue d'une embase centrale 2d qui est en saillie de la surface de l'élément inférieur 2. L'élément inférieur 2 peut également comprendre une ou plusieurs tiges 2e dirigées vers le bas de l'élément inférieur 2 et qui sont destinées à être positionnées sur une table de support, non représentée, du dispositif 1 de masquage. L'élément inférieur 2 est typiquement réalisé en acier inoxydable, recouvert de polytétrafluoroéthylène (PTFE).The lower element 2 is also in the form of a circular plate provided with orifices 2a which are distributed in the same way as the orifices 4a of the upper element 4, so as to be able to be arranged opposite each other. screws of the holes 4a when the guide elements 4b are introduced into the receiving elements 2b of the lower element 2. The receiving elements 2b are for example cylindrical through orifices. The lower element 2 also comprises a threaded rod 2c, coming from the thickness of the lower element 2 and directed upwards of the lower element 2 and which is intended to pass through the upper element 4 via a through hole 4c of the upper element 4. The threaded rod 2c can come from a central base 2d which projects from the surface of the lower element 2. The lower element 2 can also comprise one or more rods 2e directed towards the bottom of the lower element 2 and which are intended to be positioned on a support table, not shown, of the masking device 1. The lower element 2 is typically made of stainless steel, covered with polytetrafluoroethylene (PTFE).

L'écrou 5 vient coopérer avec la tige filetée 2c pour serrer l'ensemble et maintenir le joint d'étanchéité 3 en contact avec l'élément inférieur 2 et avec l'élément supérieur 4. L'écrou 5 comprend une embase 5a qui vient s'appuyer sur l'élément supérieur 4, autour de l'orifice 4c. On peut également envisager tout élément de fixation qui permet de prendre en étau le joint d'étanchéité 3 entre l'élément supérieur 4 et l'élément inférieur 2, comme par exemple une mise en compression à l'aide de sauterelles ou à l'aide d'un axe goupillé.The nut 5 cooperates with the threaded rod 2c to tighten the assembly and keep the seal 3 in contact with the lower element 2 and with the upper element 4. The nut 5 comprises a base 5a which comes lean on the upper element 4, around the hole 4c. It is also possible to envisage any fastening element which makes it possible to clamp the seal 3 between the upper element 4 and the lower element 2, such as, for example, a setting in compression using clamps or the using a pinned axle.

Le joint d'étanchéité 3 a une forme spécifique qui va être décrite en liaison avec les figures 2 et 3. Il est réalisé en un matériau élastique, typiquement un élastomère de silicone, ce qui permet une bonne immersion dans des bains acides.The seal 3 has a specific shape which will be described in connection with the figures 2 and 3 . It is made of an elastic material, typically a silicone elastomer, which allows good immersion in acid baths.

Les figures 2 et 3 illustrent le disque 6 de turbomachine, muni du dispositif 1 de masquage. Le disque 6 est typiquement un disque de compresseur haute pression. Le disque 6 comprend une partie massive 6a radialement interne, située radialement du côté d'un alésage central 7 du disque 6. La partie massive 6a est munie à son extrémité radialement interne d'une bride d'étanchéité 6b annulaire, qui est légèrement excentrée par rapport au plan du disque 6 et qui s'étend longitudinalement. Les termes « radial » et « longitudinal » sont définis par rapport à l'axe de symétrie X du disque 6 (et du dispositif 1) qui est perpendiculaire au plan du disque 6.The figures 2 and 3 illustrate the turbomachine disk 6, provided with the masking device 1. The disc 6 is typically a high pressure compressor disc. The disc 6 comprises a radially internal solid part 6a, located radially on the side of a central bore 7 of the disc 6. The solid part 6a is provided at its radially internal end with an annular sealing flange 6b, which is slightly eccentric. relative to the plane of the disc 6 and which extends longitudinally. The terms "radial" and "longitudinal" are defined with respect to the axis of X symmetry of disc 6 (and of device 1) which is perpendicular to the plane of disc 6.

La bride d'étanchéité 6b est destinée à venir en appui sur un roulement solidaire d'un carter intérieur d'étanchéité. Comme il s'agit d'une zone dans laquelle il y a des contacts importants, la bride d'étanchéité 6b est réalisée en un matériau résistant à l'usure. La bride d'étanchéité 6b peut ainsi être revêtue d'une couche 6b1 annulaire de matériau résistant, tel que par exemple un alliage résistant comme l'alliage cobalt-chrome-molybdène commercialisé sous la dénomination Tribaloy® T-800 par la société Kennametal.The sealing flange 6b is intended to come to rest on a bearing secured to an internal sealing casing. Since this is an area in which there are significant contacts, the sealing flange 6b is made of a wear resistant material. The sealing flange 6b can thus be coated with an annular layer 6b1 of resistant material, such as for example a resistant alloy such as the cobalt-chromium-molybdenum alloy sold under the name Tribaloy® T-800 by the company Kennametal.

Le dispositif 1 de masquage a ainsi pour fonction de protéger la couche 6b1 de matériau résistant de l'action des bains de nettoyage utilisés lors de l'opération de nettoyage du disque 6. C'est plus précisément le joint d'étanchéité 3 qui assure cette fonction de masquage. Le joint d'étanchéité 3 est de forme annulaire, c'est un solide de révolution autour de l'axe X obtenu à partir d'une section comprenant une partie supérieure 3a destinée à venir en appui contre l'élément supérieur 4 du dispositif 1 de masquage et une partie inférieure 3b destinée à venir en appui contre l'élément inférieur 2. La partie supérieure 3a est également destinée à venir en appui contre une extrémité longitudinale supérieure de la couche 6b1 de matériau résistant, tandis que la partie inférieure 3b est également destinée à venir en appui contre une extrémité longitudinale inférieure de la couche 6b1 de matériau résistant. La partie supérieure 3a et la partie inférieure 3b sont reliées entre elles par une partie centrale 3c formant élément de rappel. La partie centrale 3c est typiquement en forme de V.The masking device 1 thus has the function of protecting the layer 6b1 of resistant material from the action of the cleaning baths used during the operation of cleaning the disc 6. It is more precisely the seal 3 which ensures this masking function. The seal 3 is annular in shape, it is a solid of revolution around the axis X obtained from a section comprising an upper part 3a intended to bear against the upper element 4 of the device 1 masking and a lower part 3b intended to bear against the lower element 2. The upper part 3a is also intended to bear against an upper longitudinal end of the layer 6b1 of resistant material, while the lower part 3b is also intended to bear against a lower longitudinal end of the layer 6b1 of resistant material. The upper part 3a and the lower part 3b are interconnected by a central part 3c forming a return element. The central part 3c is typically V-shaped.

La partie supérieure 3a du joint d'étanchéité 3 s'appuie radialement intérieurement contre un épaulement de l'élément supérieur 4. L'épaulement est formé par la différence de diamètre extérieur entre une portion cylindrique supérieure 4d de l'élément supérieur 4 et une portion cylindrique inférieure 4e de l'élément supérieur 4. La portion cylindrique supérieure 4d est de diamètre supérieur à celui de la portion cylindrique inférieure 4e. La partie inférieure 3b du joint d'étanchéité 3 s'appuie quant à elle radialement intérieurement sur une partie supérieure tronconique 2f de l'élément inférieur 2. La partie inférieure 3b du joint d'étanchéité 3 est avantageusement biseautée pour faciliter l'appui de la partie inférieure 3b sur la partie supérieure tronconique 2f de l'élément inférieur 2. Le joint d'étanchéité 3 est avantageusement configuré pour épouser le contour des extrémités longitudinales de la couche 6b1 de matériau résistant, aussi bien radialement que longitudinalement. Ainsi, la partie supérieure 3a du joint d'étanchéité 3 épouse avantageusement le contour de l'extrémité longitudinale supérieure de la couche 6b1, tandis que la partie inférieure 3b du joint d'étanchéité 3 épouse avantageusement le contour de l'extrémité longitudinale inférieure de la couche 6b1 de matériau résistant, ce qui permet de masquer la couche 6b1 de matériau résistant et d'éviter qu'elle soit contact avec le produit de nettoyage qui circule au centre du dispositif 1. Le joint d'étanchéité 3 recouvre donc radialement et longitudinalement chaque extrémité longitudinale de la couche 6b1 et la portion de rappel en V est disposée intérieurement à la partie centrale de la couche 6b1, située entre ses deux extrémités longitudinales. Le joint 3 forme ainsi un épaulement dans lequel vient s'encastrer chaque extrémité longitudinale de la couche 6b1.The upper part 3a of the seal 3 bears radially inwardly against a shoulder of the upper element 4. The shoulder is formed by the difference in external diameter between an upper cylindrical portion 4d of the upper element 4 and a lower cylindrical portion 4th of the upper element 4. The cylindrical portion upper 4d is of greater diameter than that of the lower cylindrical portion 4e. The lower part 3b of the seal 3 for its part bears radially inwardly on a frustoconical upper part 2f of the lower element 2. The lower part 3b of the seal 3 is advantageously bevelled to facilitate the support of the lower part 3b on the frustoconical upper part 2f of the lower element 2. The seal 3 is advantageously configured to match the contour of the longitudinal ends of the layer 6b1 of resistant material, both radially and longitudinally. Thus, the upper part 3a of the seal 3 advantageously follows the contour of the upper longitudinal end of the layer 6b1, while the lower part 3b of the seal 3 advantageously follows the contour of the lower longitudinal end of the layer 6b1 of resistant material, which makes it possible to mask the layer 6b1 of resistant material and to prevent it from coming into contact with the cleaning product which circulates in the center of the device 1. The seal 3 therefore covers radially and longitudinally each longitudinal end of the layer 6b1 and the V-shaped return portion is disposed internally at the central part of the layer 6b1, located between its two longitudinal ends. The seal 3 thus forms a shoulder in which each longitudinal end of the layer 6b1 fits.

La forme particulière du joint d'étanchéité 3 permet ainsi d'assurer une étanchéité d'un pourtour intérieur (la couche 6b1 de matériau résistant de la bride d'étanchéité 6b) du disque 6. Sa géométrie avec l'élément de rappel, par exemple en forme de V assure une zone de compression de chaque côté inférieur et supérieur. Les compressions sont réalisées par les éléments inférieur 2 et supérieur 4 du dispositif 1 qui sont typiquement des éléments métalliques. Les directions de compression du joint d'étanchéité 3 sont illustrées à la figure 3 par des flèches F. La forme particulière du joint d'étanchéité 3 permet de s'adapter au mieux aux surfaces de contact de la bride d'étanchéité 6b et aux éléments inférieur 2 et supérieur 4.The particular shape of the seal 3 thus makes it possible to seal an inner periphery (the layer 6b1 of resistant material of the sealing flange 6b) of the disc 6. Its geometry with the return element, for example V-shaped example ensures a compression zone on each lower and upper side. The compressions are carried out by the lower 2 and upper 4 elements of the device 1 which are typically metallic elements. The directions of compression of the seal 3 are shown in figure 3 by arrows F. The particular shape of the seal 3 makes it possible to best adapt to the contact surfaces of the sealing flange 6b and to the lower 2 and upper 4 elements.

L'assemblage du dispositif 1 avec le disque 6 peut comprendre les étapes suivantes :

  • le disque 6 est disposé à plat sur une table de support,
  • on met en place l'élément inférieur 2 dans l'alésage central 7 du disque 6, les tiges 2e inférieures de l'élément inférieur 2 sont positionnées sur la table de support,
  • on met en place le joint d'étanchéité 3 sur le revêtement 6b1 à protéger, la partie inférieure 3b du joint d'étanchéité 3 s'appuyant sur la partie supérieure tronconique 2f de l'élément inférieur 2,
  • on met en place l'élément supérieur 4, l'épaulement de l'élément supérieur 4 étant disposé sur la partie supérieure 3a du joint d'étanchéité 3,
  • on serre l'ensemble à l'aide de l'élément de l'écrou 5 ; lors du serrage, l'élément inférieur 2 translate dans l'alésage 7 afin de venir comprimer la partie inférieure 3b du joint d'étanchéité 3, et
  • on met en oeuvre le nettoyage du disque 6.
The assembly of the device 1 with the disc 6 may include the following steps:
  • the disc 6 is placed flat on a support table,
  • the lower element 2 is placed in the central bore 7 of the disc 6, the lower rods 2e of the lower element 2 are positioned on the support table,
  • the seal 3 is placed on the coating 6b1 to be protected, the lower part 3b of the seal 3 resting on the upper frustoconical part 2f of the lower element 2,
  • the upper element 4 is put in place, the shoulder of the upper element 4 being disposed on the upper part 3a of the seal 3,
  • the assembly is tightened using the element of the nut 5; during tightening, the lower element 2 translates into the bore 7 in order to compress the lower part 3b of the seal 3, and
  • the cleaning of the disk 6 is implemented.

Ainsi, aucun effort n'est appliqué sur la couche 6b1 de matériau résistant lors de la phase de masquage. Le démasquage s'effectue aisément par un simple démontage du dispositif 1, sans laisser de résidus sur la zone masquée.Thus, no force is applied to the layer 6b1 of resistant material during the masking phase. Unmasking is easily carried out by simply removing the device 1, without leaving any residue on the masked area.

Claims (13)

  1. Device (1) for masking the inner periphery (6b1) of a disc (6) of a turbine engine, characterised in that it comprises:
    - a lower element (2), along a longitudinal axis (X),
    - an upper element (4), along a longitudinal axis (X),
    - a elastic annular seal (3), along a longitudinal axis (X), the lower element (2), the upper element (4) and the seal (3) being coaxial, the seal (3) being arranged longitudinally between the lower element (2) and the upper element (4), the seal (3) comprising a lower annular part (3b) bearing radially and internally against the lower element (2), an upper annular part (3a) bearing radially and internally against the upper element (4), the lower part (3b) and the upper part (3a) being connected to one another by an annular central part (3c) forming a return element, said seal (3) being further configured to bear longitudinally, radially and externally against each longitudinal end of said inner periphery (6b1) of the disc (6), so as to mask said inner periphery (6b1), and
    - a clamping system (2c, 5), capable of clamping the seal (3) between the lower element (2) and the upper element (4).
  2. Device (1) according to claim 1, characterised in that the central part (3b) of the seal (3) has a V-shaped revolution section.
  3. Device (1) according to claim 1 or 2, characterised in that the lower part (3b) and the upper part (3a) of the seal (3) have a revolution section comprising a radially-oriented portion and a longitudinally-oriented portion.
  4. Device (1) according to one of claims 1 to 3, characterised in that the lower part (3b) features a bevelled revolution section, of which a radially internal portion is intended to engage and bear against a frustoconical surface (2f) of the lower element (2) and a radially external portion is intended to engage and bear against a lower end of the inner periphery (6b1) of the disc (6).
  5. Device (1) according to one of claims 1 to 4, characterised in that the upper part (3a) features an L-shaped revolution section, of which a radially internal portion is intended to engage and bear against a shoulder of the upper element (4) and a radially external portion is intended to engage and bear against an upper end of the inner periphery (6b1) of the disc (6).
  6. Device (1) according to one of claims 1 to 5, characterised in that the lower element (2) and the upper element (4) are cylindrical plates.
  7. Device (1) according to one of claims 1 to 6, characterised in that the lower element (2) and the upper element (4) comprise orifices (2a, 4a) for the circulation of a cleaning liquid.
  8. Device (1) according to one of claims 1 to 7, characterised in that the clamping system (2c, 5) comprises a threaded rod (2c) secured to the lower element (2) and intersecting with the seal (3) and the upper element (4), and a nut (5) bearing against the upper element (4).
  9. Disc (6) of a turbine engine, characterised in that it is provided with a device (1) according to one of the claims 1 to 8.
  10. Disc according to claim 9, characterised in that the inner periphery (6b1) is a layer of material of a sealing flange (6b).
  11. Method for masking the inner periphery (6b1) of a disc (6) of a turbine engine, characterised in that it is provided with a device (1) according to one of the claims 1 to 8.
  12. Method according to claim 11, characterised in that it comprises the following steps:
    - a step whereby the lower element (2) is positioned in a central bore (7) of the disc (6),
    - a step whereby the seal (3) is positioned on the inner periphery (6b1) to be masked, the lower part (3b) of the seal (3) bearing radially and internally against the lower element (2),
    - a step whereby the upper element (4) is positioned, a shoulder of the upper element (4) being arranged on the upper part (3a) of the seal (3), and
    - a clamping step implementing the clamping system (2c, 5), the lower element (2) moving in a translational manner in the bore (7) under the effect of tightening, to compress the lower part (3b) of the seal (3).
  13. Method according to claim 12, characterised in that it comprises, after the tightening step, a step whereby the disc (6) is cleaned.
EP19165172.8A 2018-04-12 2019-03-26 Device for masking a perimeter inside a turbine engine disc Active EP3553281B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1853193A FR3080144B1 (en) 2018-04-12 2018-04-12 DEVICE FOR MASKING AN INTERIOR SURROUNDING OF A TURBOMACHINE DISC

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EP3553281A1 EP3553281A1 (en) 2019-10-16
EP3553281B1 true EP3553281B1 (en) 2020-09-16

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EP (1) EP3553281B1 (en)
CN (1) CN110374690B (en)
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Publication number Publication date
EP3553281A1 (en) 2019-10-16
CN110374690A (en) 2019-10-25
FR3080144B1 (en) 2020-03-20
CN110374690B (en) 2022-09-20
FR3080144A1 (en) 2019-10-18
US11261743B2 (en) 2022-03-01
US20190316476A1 (en) 2019-10-17

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