EP1433925A1 - Fixing process of a blade on a shroud - Google Patents

Fixing process of a blade on a shroud Download PDF

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Publication number
EP1433925A1
EP1433925A1 EP02447280A EP02447280A EP1433925A1 EP 1433925 A1 EP1433925 A1 EP 1433925A1 EP 02447280 A EP02447280 A EP 02447280A EP 02447280 A EP02447280 A EP 02447280A EP 1433925 A1 EP1433925 A1 EP 1433925A1
Authority
EP
European Patent Office
Prior art keywords
ferrule
blade
cavity
compressor
rectifier
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.)
Withdrawn
Application number
EP02447280A
Other languages
German (de)
French (fr)
Inventor
Alain Derclaye
Yvan Radovcic
Mathieu Bos
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 Aero Boosters SA
Original Assignee
Techspace Aero SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Techspace Aero SA filed Critical Techspace Aero SA
Priority to EP02447280A priority Critical patent/EP1433925A1/en
Publication of EP1433925A1 publication Critical patent/EP1433925A1/en
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/08—Sealings
    • F04D29/083—Sealings especially adapted for elastic fluid pumps
    • 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
    • F01D11/005—Sealing means between non relatively rotating elements
    • 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
    • F01D5/30—Fixing blades to rotors; Blade roots ; Blade spacers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D9/00—Stators
    • F01D9/02—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles
    • F01D9/04—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles forming ring or sector
    • F01D9/042—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles forming ring or sector fixing blades to stators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/52—Casings; Connections of working fluid for axial pumps
    • F04D29/54—Fluid-guiding means, e.g. diffusers
    • F04D29/541—Specially adapted for elastic fluid pumps
    • F04D29/542—Bladed diffusers

Definitions

  • the present invention relates to a method of securing a dawn on a ferrule in view to obtain a sealed mechanical connection.
  • the present invention relates to a joining process intended to be used to fix the blades on the outer ferrules turbocharger rectifiers.
  • the turbojet compressors are often made up of a succession of moving floors (made up of movable blades) which allow a compression of the air flow, and of fixed stages or rectifiers in which the blades are held in place by ferrules that align the air flow of so that the next movable floor works in good conditions.
  • the present invention relates more precisely to a process of joining the blades to the external shrouds.
  • these blades are made integral with said ferrule by welding techniques. These welds allow to obtain a mechanical connection while also ensuring sealing in the fluid vein of the rectifier stage of a compressor.
  • this cord contains an element hardener that will allow the material to polymerize or harden in the conditions of use after placement of said dawn on the ferrule which is secured using rivets, for example.
  • the present invention therefore aims to provide a solution that allows for riveted or screwed blades to ferrules of rectifier stages to present a sufficient tightness, while reducing the installation time of the sealing element.
  • the present invention therefore aims to allow reduce the costs of placing the blades and therefore manufacture of a compressor.
  • the present invention relates to a process for a rectifier stage of a compressor, said compressor allowing circulation within it air according to a certain flow defining the vein aerodynamics to secure fixed blades to a ferrule, in particular an external rectifier ferrule, using mechanical fastening means, characterized in that there is a preformed joint stabilized in a cavity which will be present between said dawn and the ferrule at the junction area of these two elements and which will allow sealing the aerodynamic stream.
  • the seal material consists of fluorocarbon elastomer (Viton).
  • Figure 1 shows a sectional view of a blade fixed on an outer shroud of a rectifier using the method according to a first embodiment.
  • Figure 2 shows a sectional view of a blade fixed on an outer shroud of a rectifier using the method according to a second embodiment.
  • the present invention therefore relates to a method of securing the blades on a ferrule exterior of a rectifier stage.
  • Figures 1 and 2 show two examples execution of such a process.
  • the present invention proposes to solve the problem of overflow of the material overflow by the provision of a preformed seal 6, that is to say made of a material which is already stabilized, so that its shape essentially corresponds to that of the groove or cavity 4 provided to receive it at the intersection of dawn and the ferrule.
  • a preformed seal 6 that is to say made of a material which is already stabilized, so that its shape essentially corresponds to that of the groove or cavity 4 provided to receive it at the intersection of dawn and the ferrule.
  • the preformed seal 6 is made of fluorocarbon elastomer (Viton).
  • the seal 6 has a slightly larger than the groove or cavity 4 in which it will be placed.
  • the technique of joining the blades onto a ferrule allows particularly advantageous to increase productivity and therefore reduce the cost of making such compressors because they no longer require the use of a manual operation which consisted in carefully dosing the amount of polymer before assembly and remove joint overflows after assembly.

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

Abstract

The procedure for fastening a fixed blade (1) to a compressor ring (3), especially the outer ring of a rectifier stage, using a mechanical fastening (5) such as a rivet, includes the insertion of a pre-formed stabilised joint (6) in a groove or cavity (4) between the blade and the ring in the zone (2) where they meet. The joint is designed to be slightly bigger than the dimensions of the groove or cavity in which it is placed, filling it completely once the mechanical fastening has been fixed, while obviating the need for a sealing bead to be applied or surplus material to be removed.

Description

Objet de l'inventionSubject of the invention

La présente invention se rapporte à un procédé de solidarisation d'une aube sur une virole en vue d'obtenir une liaison mécanique étanche.The present invention relates to a method of securing a dawn on a ferrule in view to obtain a sealed mechanical connection.

Plus particulièrement, la présente invention se rapporte à un procédé de solidarisation destiné à être utilisé pour fixer les aubes sur les viroles extérieures des redresseurs de turbocompresseurs.More particularly, the present invention relates to a joining process intended to be used to fix the blades on the outer ferrules turbocharger rectifiers.

Arrière-plan technologiqueTechnological background

Les compresseurs de turboréacteurs sont souvent constitués d'une succession d'étages mobiles (constitués d'aubes mobiles) qui permettent de réaliser une compression du flux d'air, et d'étages fixes ou redresseurs dans lesquels les aubes sont maintenues par des viroles extérieures et qui permettent d'aligner le flux d'air de façon à ce que l'étage mobile suivant fonctionne dans de bonnes conditions.The turbojet compressors are often made up of a succession of moving floors (made up of movable blades) which allow a compression of the air flow, and of fixed stages or rectifiers in which the blades are held in place by ferrules that align the air flow of so that the next movable floor works in good conditions.

La présente invention se rapporte plus précisément à un procédé de solidarisation des aubes aux viroles extérieures des redresseurs.The present invention relates more precisely to a process of joining the blades to the external shrouds.

Dans plusieurs exemples de réalisation existantes, ces aubes sont rendues solidaires de ladite virole par des techniques de soudure. Ces soudures permettent d'obtenir une solidarisation mécanique tout en assurant également l'étanchéité dans la veine fluide de l'étage redresseur d'un compresseur.In several examples of implementation existing, these blades are made integral with said ferrule by welding techniques. These welds allow to obtain a mechanical connection while also ensuring sealing in the fluid vein of the rectifier stage of a compressor.

D'autres techniques de solidarisation consistent à utiliser des moyens de solidarisation mécanique, tels que des vis ou des rivets, qui permettent un assemblage mécanique très résistant. Cependant, de tels procédés de solidarisation présentent l'inconvénient qu'il est nécessaire, pour obtenir l'étanchéité adéquate dans la veine fluide, de disposer de joints supplémentaires à l'interface de liaison de l'aube sur la virole.Other joining techniques consist in using solidarity means mechanical, such as screws or rivets, which allow a very resistant mechanical assembly. However, such joining processes have the disadvantage that it is necessary, to obtain adequate sealing in the fluid vein, to have additional seals to the dawn link interface on the shell.

Selon une technique classique, on dispose un dépôt de polymère, par exemple un cordon de silicone souple, qui est de type bi-composant ou même mono-composant. Avantageusement, ce cordon contient un élément durcisseur qui permettra à la matière de polymériser ou de durcir dans les conditions d'utilisation après placement de ladite aube sur la virole que l'on solidarise à l'aide de rivets, par exemple.According to a conventional technique, there is a polymer deposition, for example a silicone bead flexible, which is of the bi-component or even mono-component type. Advantageously, this cord contains an element hardener that will allow the material to polymerize or harden in the conditions of use after placement of said dawn on the ferrule which is secured using rivets, for example.

Cependant, en l'absence de précautions particulières, on observe après le durcissement du cordon, un débordement de matière qui perturbe la veine aérodynamique, ce qui peut être fortement préjudiciable au rendement du compresseur.However, in the absence of precautions particular, we observe after the hardening of the cord, an overflow of matter which disturbs the vein aerodynamics, which can be highly detrimental to compressor efficiency.

De ce fait, il est nécessaire d'éliminer ces matières excédentaires par une opération manuelle qui est de ce fait influencée par la compétence et l'habilité de l'opérateur. Ceci bien entendu rend les coûts de réalisation de tels compresseurs relativement élevés.Therefore, it is necessary to eliminate these excess material by manual operation which is thus influenced by the competence and skill of the operator. This of course makes the costs of realization of such relatively high compressors.

Buts de l'inventionAims of the invention

La présente invention vise donc à proposer une solution qui permet pour des aubes rivetées ou vissées à des viroles d'étages redresseurs de présenter une étanchéité suffisante, tout en permettant de réduire le temps de mise en place de l'élément de l'étanchéité.The present invention therefore aims to provide a solution that allows for riveted or screwed blades to ferrules of rectifier stages to present a sufficient tightness, while reducing the installation time of the sealing element.

La présente invention vise donc à permettre de réduire les coûts de placement des aubes et donc de fabrication d'un compresseur.The present invention therefore aims to allow reduce the costs of placing the blades and therefore manufacture of a compressor.

Principaux éléments caractéristiquesMain characteristic elements

La présente invention se rapporte à un procédé destiné à un étage redresseur d'un compresseur, ledit compresseur autorisant en son sein la circulation d'air selon un certain flux définissant la veine aérodynamique pour solidariser des aubes fixes à une virole, en particulier une virole extérieure de redresseur, à l'aide de moyens de solidarisation mécanique, caractérisé en ce que l'on dispose un joint préformé stabilisé dans une cavité qui sera présente entre ladite aube et la virole à la zone de jonction de ces deux éléments et qui permettra d'assurer l'étanchéité de la veine aérodynamique.The present invention relates to a process for a rectifier stage of a compressor, said compressor allowing circulation within it air according to a certain flow defining the vein aerodynamics to secure fixed blades to a ferrule, in particular an external rectifier ferrule, using mechanical fastening means, characterized in that there is a preformed joint stabilized in a cavity which will be present between said dawn and the ferrule at the junction area of these two elements and which will allow sealing the aerodynamic stream.

De manière particulièrement avantageuse, la matière du joint est constituée d'élastomère fluorocarboné (Viton).Particularly advantageously, the seal material consists of fluorocarbon elastomer (Viton).

Description détaillée des figuresDetailed description of the figures

La figure 1 représente une vue en coupe d'une aube fixée sur une virole extérieure d'un redresseur utilisant le procédé selon une première forme d'exécution.Figure 1 shows a sectional view of a blade fixed on an outer shroud of a rectifier using the method according to a first embodiment.

La figure 2 représente une vue en coupe d'une aube fixée sur une virole extérieure d'un redresseur utilisant le procédé selon une seconde forme d'exécution. Figure 2 shows a sectional view of a blade fixed on an outer shroud of a rectifier using the method according to a second embodiment.

Description détaillée d'une forme d'exécution de l'inventionDetailed description of an embodiment of the invention

La présente invention se rapporte donc à un procédé de solidarisation des aubes sur une virole extérieure d'un étage redresseur.The present invention therefore relates to a method of securing the blades on a ferrule exterior of a rectifier stage.

Les figures 1 et 2 représentent deux exemples d'exécution d'un tel procédé. A la figure 1, on observe en coupe une aube 1 solidarisée à une virole 3 par l'intermédiaire d'au moins un rivet 5.Figures 1 and 2 show two examples execution of such a process. In Figure 1, we observe in cuts a blade 1 secured to a ferrule 3 by at least one rivet 5.

Le point délicat dans ce procédé de solidarisation réside dans l'étanchéité à obtenir à la jonction 2 de l'aube avec la virole.The tricky point in this process of solidarity lies in the seal to be obtained at the junction 2 of dawn with the ferrule.

Habituellement, on dispose à cet endroit un dépôt de polymère qui, après durcissement et polymérisation, a la capacité, dans les conditions d'utilisation, de remplir une cavité 4 réalisée à la jonction 2 aube - virole. Cependant, on observe en pratique que selon l'état de la technique, non seulement le dépôt de polymère aura tendance à effectivement remplir ladite cavité 4, mais également à déborder en dehors de cette cavité 4, créant un trop-plein de matière.Usually there is a deposit of polymer which, after hardening and polymerization, has the capacity, under the conditions of use, to fill a cavity 4 produced at the junction 2 dawn - ferrule. However, we observe in practical that according to the state of the art, not only the polymer deposition will tend to actually fill said cavity 4, but also to overflow outside of this cavity 4, creating an overflow of material.

Ainsi qu'illustré à la figure 1, la présente invention se propose de résoudre le problème de débordement du trop-plein de matière par la disposition d'un joint préformé 6, c'est-à-dire réalisé dans une matière qui est déjà stabilisée, de telle manière que sa forme corresponde essentiellement à celle de la gorge ou de la cavité 4 prévue pour le recevoir à l'intersection de l'aube et de la virole. Après la pose de l'aube, qui est solidarisée de manière classique à l'aide de moyens mécaniques, tels que des rivets 5, le joint 6 aura tendance à remplir complètement ladite gorge ou cavité 4, sans toutefois qu'il y ait de débordement de matière en dehors de celle-ci. Ceci est dû essentiellement au fait que le joint 6 a été préalablement stabilisé afin d'éviter toute réaction de polymérisation ultérieure in situ.As illustrated in FIG. 1, the present invention proposes to solve the problem of overflow of the material overflow by the provision of a preformed seal 6, that is to say made of a material which is already stabilized, so that its shape essentially corresponds to that of the groove or cavity 4 provided to receive it at the intersection of dawn and the ferrule. After the installation of the blade, which is secured in a conventional manner using mechanical means, such as rivets 5, the seal 6 will tend to completely fill said groove or cavity 4, without however there being any material overflow outside of it. This is mainly due to the fact that the seal 6 has been stabilized beforehand in order to avoid any subsequent polymerization reaction in situ .

De manière particulièrement avantageuse, le joint préformé 6 est réalisé en élastomère fluorocarboné (Viton).Particularly advantageously, the preformed seal 6 is made of fluorocarbon elastomer (Viton).

Selon une forme d'exécution particulière telle qu'illustrée à la figure 2, le joint 6 présente un dimensionnement légèrement supérieur à celui de la gorge ou cavité 4 dans laquelle il va être disposé.According to a particular form of execution as illustrated in Figure 2, the seal 6 has a slightly larger than the groove or cavity 4 in which it will be placed.

Comparativement aux procédés de l'état de l'art, la technique de solidarisation des aubes sur une virole, telle que décrite ci-dessus, permet de manière particulièrement avantageuse d'augmenter la productivité et donc de réduire le coût de réalisation de tels compresseurs, car ils ne nécessitent plus le recours à une opération manuelle qui consistait à doser soigneusement la quantité de polymère avant assemblage et à éliminer les débordements de matière du joint après assemblage.Compared to state process the art, the technique of joining the blades onto a ferrule, as described above, allows particularly advantageous to increase productivity and therefore reduce the cost of making such compressors because they no longer require the use of a manual operation which consisted in carefully dosing the amount of polymer before assembly and remove joint overflows after assembly.

Claims (2)

Procédé destiné à un étage redresseur d'un compresseur, ledit compresseur autorisant en son sein la circulation d'air selon un certain flux définissant la veine aérodynamique pour solidariser des aubes fixes (1) à une virole (3), en particulier une virole extérieure de redresseur, à l'aide de moyens (5) de solidarisation mécanique, caractérisé en ce que l'on dispose un joint (6) préformé stabilisé dans une cavité (4) qui sera présente entre ladite aube (1) et la virole (3) à la zone (2) de jonction de ces deux éléments (1, 3) et qui permettra d'assurer l'étanchéité de la veine aérodynamique.Method for a rectifier stage of a compressor, said compressor authorizing within it the circulation of air according to a certain flow defining the aerodynamic stream to secure fixed vanes (1) to a ferrule (3), in particular an outer ferrule rectifier, using mechanical fastening means (5), characterized in that there is a preformed seal (6) stabilized in a cavity (4) which will be present between said blade (1) and the ferrule ( 3) to the zone (2) of junction of these two elements (1, 3) and which will ensure the tightness of the aerodynamic stream. Procédé selon la revendication précédente, caractérisé en ce que la matière du joint est constituée d'élastomère fluorocarboné (Viton).Method according to the preceding claim, characterized in that the material of the seal consists of fluorocarbon elastomer (Viton).
EP02447280A 2002-12-24 2002-12-24 Fixing process of a blade on a shroud Withdrawn EP1433925A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP02447280A EP1433925A1 (en) 2002-12-24 2002-12-24 Fixing process of a blade on a shroud

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Application Number Priority Date Filing Date Title
EP02447280A EP1433925A1 (en) 2002-12-24 2002-12-24 Fixing process of a blade on a shroud

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8469662B2 (en) * 2008-12-22 2013-06-25 Techspace Aero S.A. Guide vane architecture
EP2613011A1 (en) * 2012-01-05 2013-07-10 General Electric Company System and method for sealing a gas path in a turbine

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB572859A (en) * 1942-04-03 1945-10-26 Armstrong Siddeley Motors Ltd Mounting the blades of axial-flow, rotary compressors or turbines
GB599391A (en) * 1945-05-25 1948-03-11 Power Jets Res & Dev Ltd Improvements in and relating to axial flow compressors, turbines and the like machines
US4279424A (en) * 1978-10-26 1981-07-21 Sulzer Brothers Limited Sealing arrangement for a joint between two stator parts of a turbomachine
US4982889A (en) * 1989-08-09 1991-01-08 Union Carbide Corporation Floating dual direction seal assembly
EP1239119A1 (en) * 2001-03-07 2002-09-11 General Electric Company Turbine vane assembly including a low ductility vane

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB572859A (en) * 1942-04-03 1945-10-26 Armstrong Siddeley Motors Ltd Mounting the blades of axial-flow, rotary compressors or turbines
GB599391A (en) * 1945-05-25 1948-03-11 Power Jets Res & Dev Ltd Improvements in and relating to axial flow compressors, turbines and the like machines
US4279424A (en) * 1978-10-26 1981-07-21 Sulzer Brothers Limited Sealing arrangement for a joint between two stator parts of a turbomachine
US4982889A (en) * 1989-08-09 1991-01-08 Union Carbide Corporation Floating dual direction seal assembly
EP1239119A1 (en) * 2001-03-07 2002-09-11 General Electric Company Turbine vane assembly including a low ductility vane

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8469662B2 (en) * 2008-12-22 2013-06-25 Techspace Aero S.A. Guide vane architecture
EP2613011A1 (en) * 2012-01-05 2013-07-10 General Electric Company System and method for sealing a gas path in a turbine

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