EP1970541A1 - Turbomachine exhaust case drain - Google Patents

Turbomachine exhaust case drain Download PDF

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Publication number
EP1970541A1
EP1970541A1 EP08151545A EP08151545A EP1970541A1 EP 1970541 A1 EP1970541 A1 EP 1970541A1 EP 08151545 A EP08151545 A EP 08151545A EP 08151545 A EP08151545 A EP 08151545A EP 1970541 A1 EP1970541 A1 EP 1970541A1
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EP
European Patent Office
Prior art keywords
drain
turbomachine
orifice
skirt
housing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP08151545A
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German (de)
French (fr)
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EP1970541B1 (en
Inventor
Nicolas Auguste Marcel Pommier
Christian René Schnell
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Safran Aircraft Engines SAS
Original Assignee
SNECMA SAS
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Publication date
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Publication of EP1970541A1 publication Critical patent/EP1970541A1/en
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Publication of EP1970541B1 publication Critical patent/EP1970541B1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
    • F01D25/30—Exhaust heads, chambers, or the like
    • 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
    • F01D25/32—Collecting of condensation water; Drainage ; Removing solid particles
    • 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
    • F05D2250/20—Three-dimensional
    • F05D2250/23—Three-dimensional prismatic
    • F05D2250/231—Three-dimensional prismatic cylindrical
    • 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
    • F05D2260/60—Fluid transfer
    • F05D2260/602—Drainage

Definitions

  • the present invention relates to a drain for draining liquids, in an exhaust casing of a turbomachine such as a turbojet engine.
  • the exhaust casing of a turbomachine generally comprises a groove which is formed downstream and close to the upstream fastening flange of this casing and which constitutes a dead zone, that is to say, protected from the flow primary. It is common for liquids, such as water, fuel and oil, to be held in an area “at 6 o'clock", i.e., downward, in this groove.
  • the exhaust casings generally comprise an orifice with a drain at this zone. in order to evacuate the liquids towards the outside of the turbomachine.
  • This drain is usually formed of a cylindrical body which is welded to the housing at the aforementioned discharge orifice.
  • the object of the present invention is to provide a simple, effective and economical solution to this problem, in particular by simplifying the mounting of the drain on the exhaust casing and considerably reducing the working time required for this assembly.
  • Another object of the invention is to guarantee a good solidity and a correct sealing of the fixing of the drain on the housing.
  • turbomachine exhaust casing comprising an annular groove pierced with an orifice in which is mounted a drain formed of a tubular cylindrical body, for discharging liquids retained in this groove, characterized in that that the drain comprises a skirt formed at one end of the cylindrical body and crimped in the hole of the groove of the housing for fixing the drain to the housing.
  • Fixing the drain by crimping makes it possible to avoid the use of an annular weld, the disadvantages of which have been mentioned above, and thus offers a significant time saving when mounting the drain on the exhaust casing of the turbomachine, the time complete assembly being approximately 30 minutes instead of several hours.
  • the drain is made of a metal alloy having a coefficient of thermal expansion greater than the coefficient of thermal expansion of the housing around the mounting hole of the drain.
  • the expansion of the drain under the effect of the increase in temperature in operation, induces a drain blocking effect in the housing orifice, and thus improves the fixing of the drain to the housing.
  • the drain mounting orifice comprises, at one end, a cylindrical portion connected by an internal flange to a frustoconical portion at the other end of the orifice, this frustoconical portion having a center angle of about 60 degrees.
  • the skirt of the drain which has a thickness less than that of the cylindrical body and extends in the extension of the inner surface of this cylindrical body, is applied to the inner flange and the frustoconical portion after crimping.
  • This configuration makes it possible to obtain optimal crimping and to limit at best the risks of loss of the drain during operation or during the maintenance phase of the turbomachine.
  • the cylindrical portion of the orifice has a diameter greater than the maximum diameter of the frustoconical portion.
  • the cylindrical part thus forms a chamber in which the end of the cylindrical body of the drain carrying the skirt is inserted, so that an annular rim of the cylindrical body, formed at the base of this skirt, is applied to a bottom of this chamber.
  • the free end of the skirt after crimping is substantially at the inner surface of the groove of the housing.
  • the drain is connected to the casing by at least one weld point to reinforce its attachment to the housing.
  • the invention also relates to a turbomachine, such as an aircraft turbojet, characterized in that it comprises an exhaust casing of the type described above.
  • the invention also relates to an exhaust casing drain in a turbomachine, characterized in that it comprises a tubular cylindrical body extended at one end by a cylindrical crimping skirt having a thickness less than that of the body and extending the inner surface of the cylindrical body.
  • FIG 1 showing a turbomachine exhaust casing 10 of a known type, seen from upstream, comprising two coaxial cylindrical shells respectively inner 12 and outer 14, connected by oblique arms 16.
  • the outer shell 14 has at its upstream end an annular groove 18, which is located downstream and close to the upstream flange 20 fixing the exhaust casing, and a region located "at 6 o'clock", that is to say at the bottom, is pierced d an evacuation orifice 22 provided with a drain intended to evacuate outwards liquids capable of being collected in this groove.
  • the figure 2 is a view on a larger scale of the discharge orifice 22 and its drain 24 which is formed of a tubular cylindrical body 26 fixed to the rim of the orifice 22 by an annular weld 28 formed on the periphery of this orifice .
  • the surface 30 of the weld 28 connecting the inner wall 32 of the drain to the inner wall 34 of the groove 18 of the housing is frustoconical.
  • the mounting of the drain 24 on the exhaust casing 10 consists in particular in producing the weld 28 and then manually retouching this weld in order to eliminate any surplus on the inner wall 32 of the drain and on the inner wall 34 of the groove 18, and to form the frustoconical surface of the weld 28.
  • Such an assembly requires about 4 hours of work.
  • the present invention aims to change the way of fixing the drain to the exhaust casing to avoid the use of an annular welding as in the prior art.
  • FIG 3 schematically shows a drain 36 according to the invention before its mounting on the exhaust casing 10.
  • This drain comprises a tubular cylindrical body 38 and a skirt 40, which is formed at one end of the body 38, which has a thickness less than that of this body, and which extends in the extension of the inner surface 42 of the body, this skirt 40 being intended to allow the attachment of the drain 36 by crimping in the orifice 22 of the groove 18 of the housing.
  • the end of the cylindrical body 38 carrying the skirt 40 forms an annular flange 44 at the base of this skirt.
  • the figure 4 represents the drain 36 mounted in the orifice 22 of the exhaust casing 10 after crimping its skirt 40.
  • This orifice has been machined to allow this crimping to fix the drain to the casing, and comprises at one end outside the groove, a cylindrical portion 46, connected by an inner flange 48 to a frustoconical portion 50 at the other end of the orifice within the groove, the frustoconical portion 50 having a center angle of about 60 degrees.
  • the cylindrical portion 46 whose inner diameter is substantially equal to the outer diameter of the cylindrical body 38 of the drain 36, forms a recess having a bottom 52 bounded by the internal rim 48 of the orifice and on which the annular flange 44 of the drain 36.
  • the skirt 40 has an outer diameter substantially equal to the inner diameter of the flange 48 and is applied to the frustoconical portion 50 of the orifice 22, to ensure the retention of the drain to the housing.
  • the drain 36 is made of a metal alloy with a coefficient of thermal expansion greater than that of the exhaust casing 10.
  • the temperature rise inherent in the operation of the turbomachine induces a plating and a locking of the skirt 40 on the parts cylindrical 48 and frustoconical 50 of the orifice 22, which has the effect of reinforcing the attachment of the drain 36 to the casing 10.
  • the free end of the skirt 40 is substantially at the surface of the groove 18 of the housing, in order to optimize the crimping while preventing this free end of the skirt protruding into the groove.
  • the crimping of the skirt 40 is a simple and fast operation, which can for example be performed by means of a crimping gun, and requires about 30 minutes.
  • drain 36 is damaged, it is possible to replace it with a welded drain of known type after having pierced the orifice 22 of the groove 18 of the exhaust casing to obtain a smooth orifice compatible with this type of drain.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Exhaust Silencers (AREA)
  • Gasket Seals (AREA)
  • Supercharger (AREA)

Abstract

The case (10) has an annular channel (18) pierced with an evacuation orifice (22) in which a drain (36) is mounted to evacuate a liquid e.g. fuel, from the channel. The drain is formed of a tubular cylindrical body (38), and has a wall (40) formed at an end of the body for fixation of the drain by setting in the orifice. The drain is made of a metal alloy having a thermal dilation coefficient that is higher than the thermal dilation coefficient of the case around the orifice.

Description

La présente invention concerne un drain d'évacuation de liquides, dans un carter d'échappement d'une turbomachine telle qu'un turboréacteur.The present invention relates to a drain for draining liquids, in an exhaust casing of a turbomachine such as a turbojet engine.

Le carter d'échappement d'une turbomachine comporte généralement une rainure qui est formée en aval et à proximité de la bride de fixation amont de ce carter et qui constitue une zone morte, c'est-à-dire à l'abri du flux primaire. Il est fréquent que des liquides, tels que de l'eau, du carburant et de l'huile, soient retenus dans une zone située « à 6 heures », c'est-à-dire vers le bas, dans cette rainure.The exhaust casing of a turbomachine generally comprises a groove which is formed downstream and close to the upstream fastening flange of this casing and which constitutes a dead zone, that is to say, protected from the flow primary. It is common for liquids, such as water, fuel and oil, to be held in an area "at 6 o'clock", i.e., downward, in this groove.

La stagnation de ces liquides n'est pas souhaitable, compte tenu notamment des risques d'incendie et de ceux liés au gel, et pour cette raison, les carters d'échappement comprennent généralement un orifice muni d'un drain au niveau de cette zone morte afin d'évacuer les liquides vers l'extérieur de la turbomachine.The stagnation of these liquids is undesirable, particularly in view of the risk of fire and those related to freezing, and for this reason, the exhaust casings generally comprise an orifice with a drain at this zone. in order to evacuate the liquids towards the outside of the turbomachine.

Ce drain est habituellement formé d'un corps cylindrique qui est soudé au carter au niveau de l'orifice d'évacuation précité.This drain is usually formed of a cylindrical body which is welded to the housing at the aforementioned discharge orifice.

La réalisation de cette soudure est cependant une opération longue, délicate, difficilement contrôlable et relativement dangereuse pour l'opérateur, et nécessite en particulier des retouches manuelles afin d'éliminer le surplus qui dépasse dans le drain et dans la veine primaire au niveau de la paroi interne du carter. Il est, de ce fait, nécessaire de prévoir de l'ordre de 4 heures de travail pour réaliser l'opération complète de soudure et d'élimination de surplus.The realization of this weld is however a long, delicate operation, difficult to control and relatively dangerous for the operator, and requires in particular manual retouching in order to eliminate the surplus that exceeds in the drain and in the primary vein at the level of internal wall of the housing. It is, therefore, necessary to provide the order of 4 hours of work to achieve the complete operation of welding and surplus disposal.

La présente invention a pour but d'apporter une solution simple, efficace et économique à ce problème, en simplifiant notamment le montage du drain sur le carter d'échappement et en réduisant considérablement le temps de travail nécessaire à ce montage.The object of the present invention is to provide a simple, effective and economical solution to this problem, in particular by simplifying the mounting of the drain on the exhaust casing and considerably reducing the working time required for this assembly.

L'invention a également pour but de garantir une bonne solidité et une étanchéité correcte de la fixation du drain sur le carter.Another object of the invention is to guarantee a good solidity and a correct sealing of the fixing of the drain on the housing.

Elle propose à cet effet un carter d'échappement de turbomachine, comportant une rainure annulaire percée d'un orifice dans lequel est monté un drain formé d'un corps cylindrique tubulaire, pour l'évacuation de liquides retenus dans cette rainure, caractérisé en ce que le drain comprend une jupe formée à une extrémité du corps cylindrique et sertie dans l'orifice de la rainure du carter pour la fixation du drain au carter.It proposes for this purpose a turbomachine exhaust casing, comprising an annular groove pierced with an orifice in which is mounted a drain formed of a tubular cylindrical body, for discharging liquids retained in this groove, characterized in that that the drain comprises a skirt formed at one end of the cylindrical body and crimped in the hole of the groove of the housing for fixing the drain to the housing.

La fixation du drain par sertissage permet d'éviter le recours à une soudure annulaire, dont les inconvénients ont été évoqués précédemment, et offre ainsi un gain de temps significatif lors du montage du drain sur le carter d'échappement de la turbomachine, le temps de montage complet étant d'environ 30 minutes au lieu de plusieurs heures.Fixing the drain by crimping makes it possible to avoid the use of an annular weld, the disadvantages of which have been mentioned above, and thus offers a significant time saving when mounting the drain on the exhaust casing of the turbomachine, the time complete assembly being approximately 30 minutes instead of several hours.

Avantageusement, le drain est réalisé dans un alliage métallique ayant un coefficient de dilatation thermique supérieur au coefficient de dilatation thermique du carter autour de l'orifice de montage du drain.Advantageously, the drain is made of a metal alloy having a coefficient of thermal expansion greater than the coefficient of thermal expansion of the housing around the mounting hole of the drain.

La dilatation du drain, sous l'effet de l'élévation de la température en fonctionnement, induit un effet de blocage du drain dans l'orifice du carter, et permet ainsi d'améliorer la fixation du drain au carter.The expansion of the drain, under the effect of the increase in temperature in operation, induces a drain blocking effect in the housing orifice, and thus improves the fixing of the drain to the housing.

Selon un mode de réalisation préféré de l'invention, l'orifice de montage du drain comprend, à une extrémité, une partie cylindrique reliée par un rebord interne à une partie tronconique à l'autre extrémité de l'orifice, cette partie tronconique présentant un angle au centre de 60 degrés environ. La jupe du drain, qui a une épaisseur inférieure à celle du corps cylindrique et s'étend dans le prolongement de la surface interne de ce corps cylindrique, est appliquée sur le rebord interne et sur la partie tronconique après sertissage.According to a preferred embodiment of the invention, the drain mounting orifice comprises, at one end, a cylindrical portion connected by an internal flange to a frustoconical portion at the other end of the orifice, this frustoconical portion having a center angle of about 60 degrees. The skirt of the drain, which has a thickness less than that of the cylindrical body and extends in the extension of the inner surface of this cylindrical body, is applied to the inner flange and the frustoconical portion after crimping.

Cette configuration permet d'obtenir un sertissage optimal et de limiter au mieux les risques de perte du drain en fonctionnement ou en phase de maintenance de la turbomachine.This configuration makes it possible to obtain optimal crimping and to limit at best the risks of loss of the drain during operation or during the maintenance phase of the turbomachine.

Avantageusement, la partie cylindrique de l'orifice a un diamètre supérieur au diamètre maximal de la partie tronconique.Advantageously, the cylindrical portion of the orifice has a diameter greater than the maximum diameter of the frustoconical portion.

La partie cylindrique forme ainsi un chambrage dans lequel l'extrémité du corps cylindrique du drain portant la jupe est insérée, de sorte qu'un rebord annulaire du corps cylindrique, formé à la base de cette jupe, est appliqué sur un fond de ce chambrage.The cylindrical part thus forms a chamber in which the end of the cylindrical body of the drain carrying the skirt is inserted, so that an annular rim of the cylindrical body, formed at the base of this skirt, is applied to a bottom of this chamber.

Selon une caractéristique de l'invention, l'extrémité libre de la jupe après sertissage se trouve sensiblement au niveau de la surface interne de la rainure du carter.According to a feature of the invention, the free end of the skirt after crimping is substantially at the inner surface of the groove of the housing.

Cela permet de garantir une bonne étanchéité entre le drain et le carter d'échappement dans lequel il est monté, tout en conservant la planéité de la paroi interne de la rainure de ce carter autour de son orifice d'évacuation.This ensures a good seal between the drain and the exhaust casing in which it is mounted, while maintaining the flatness of the inner wall of the groove of this housing around its discharge port.

Selon une autre caractéristique de l'invention, le drain est relié au carter par au moins un point de soudure afin de renforcer sa fixation au carter.According to another characteristic of the invention, the drain is connected to the casing by at least one weld point to reinforce its attachment to the housing.

L'invention concerne également une turbomachine, telle qu'un turboréacteur d'avion, caractérisée en ce qu'elle comprend un carter d'échappement du type décrit ci-dessus.The invention also relates to a turbomachine, such as an aircraft turbojet, characterized in that it comprises an exhaust casing of the type described above.

L'invention concerne encore un drain de carter d'échappement dans une turbomachine, caractérisé en ce qu'il comprend un corps cylindrique tubulaire prolongé à une extrémité par une jupe cylindrique de sertissage ayant une épaisseur inférieure à celle du corps et prolongeant la surface interne du corps cylindrique.The invention also relates to an exhaust casing drain in a turbomachine, characterized in that it comprises a tubular cylindrical body extended at one end by a cylindrical crimping skirt having a thickness less than that of the body and extending the inner surface of the cylindrical body.

D'autres avantages et caractéristiques 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 est une vue schématique en perspective d'un carter d'échappement de turbomachine selon l'art antérieur ;
  • la figure 2 est une vue schématique en coupe axiale d'une partie du carter d'échappement de la figure 1 ;
  • les figures 3 et 4 sont des vues schématiques partielles en coupe axiale d'un carter d'échappement de turbomachine selon l'invention.
Other advantages and characteristics of the invention will appear on reading the following description given by way of nonlimiting example and with reference to the appended drawings in which:
  • the figure 1 is a schematic perspective view of a turbomachine exhaust casing according to the prior art;
  • the figure 2 is a schematic view in axial section of a part of the exhaust casing of the figure 1 ;
  • the Figures 3 and 4 are partial schematic views in axial section of a turbomachine exhaust casing according to the invention.

On se réfère d'abord à la figure 1, montrant un carter d'échappement 10 de turbomachine d'un type connu, vu depuis l'amont, comprenant deux coques cylindriques coaxiales respectivement intérieure 12 et extérieure 14, reliées par des bras obliques 16. La coque extérieure 14 comporte à son extrémité amont une rainure annulaire 18, qui est située en aval et à proximité de la bride amont 20 de fixation du carter d'échappement, et dont une région située « à 6 heures », c'est-à-dire en bas, est percée d'un orifice d'évacuation 22 muni d'un drain destiné à évacuer vers l'extérieur des liquides susceptibles d'être recueillis dans cette rainure.We first refer to the figure 1 , showing a turbomachine exhaust casing 10 of a known type, seen from upstream, comprising two coaxial cylindrical shells respectively inner 12 and outer 14, connected by oblique arms 16. The outer shell 14 has at its upstream end an annular groove 18, which is located downstream and close to the upstream flange 20 fixing the exhaust casing, and a region located "at 6 o'clock", that is to say at the bottom, is pierced d an evacuation orifice 22 provided with a drain intended to evacuate outwards liquids capable of being collected in this groove.

La figure 2 est une vue à plus grande échelle de l'orifice d'évacuation 22 et de son drain 24 qui est formé d'un corps cylindrique tubulaire 26 fixé au rebord de l'orifice 22 par une soudure annulaire 28 formée sur le pourtour de cet orifice. La surface 30 de la soudure 28 reliant la paroi interne 32 du drain à la paroi interne 34 de la rainure 18 du carter est tronconique.The figure 2 is a view on a larger scale of the discharge orifice 22 and its drain 24 which is formed of a tubular cylindrical body 26 fixed to the rim of the orifice 22 by an annular weld 28 formed on the periphery of this orifice . The surface 30 of the weld 28 connecting the inner wall 32 of the drain to the inner wall 34 of the groove 18 of the housing is frustoconical.

Le montage du drain 24 sur le carter d'échappement 10 consiste notamment à réaliser la soudure 28 puis à retoucher manuellement cette soudure afin d'éliminer les surplus éventuels sur la paroi interne 32 du drain et sur la paroi interne 34 de la rainure 18, et pour former la surface tronconique de la soudure 28. Un tel montage nécessite environ 4 heures de travail.The mounting of the drain 24 on the exhaust casing 10 consists in particular in producing the weld 28 and then manually retouching this weld in order to eliminate any surplus on the inner wall 32 of the drain and on the inner wall 34 of the groove 18, and to form the frustoconical surface of the weld 28. Such an assembly requires about 4 hours of work.

En fonctionnement, il est fréquent que de faibles quantités d'eau soient piégées dans la rainure 18 de la coque extérieure 14 du carter d'échappement 10. Il se peut qu'un peu de carburant soit également présent dans cette zone, notamment en cas de démarrage avorté de la turbomachine, ou encore de l'huile en cas de fuite sur le circuit correspondant. Le drain 24 permet l'évacuation de ces liquides vers l'extérieur en évitant ainsi les risques liés au gel de ces liquides et à l'incendie.In operation, it is common for small amounts of water to be trapped in the groove 18 of the outer shell 14 of the exhaust casing 10. It may be that a little fuel is also present in this area, particularly in case aborted start of the turbomachine, or the oil in case of leakage on the corresponding circuit. The drain 24 allows the evacuation of these liquids to the outside thus avoiding the risks associated with the freezing of these liquids and the fire.

La présente invention vise à modifier le mode de fixation du drain au carter d'échappement afin d'éviter le recours à une soudure annulaire comme dans l'art antérieur.The present invention aims to change the way of fixing the drain to the exhaust casing to avoid the use of an annular welding as in the prior art.

La figure 3 représente schématiquement un drain 36 selon l'invention avant son montage sur le carter d'échappement 10. Ce drain comprend un corps cylindrique tubulaire 38 et une jupe 40, qui est formée à une extrémité du corps 38, qui a une épaisseur inférieure à celle de ce corps, et qui s'étend dans, le prolongement de la surface interne 42 du corps, cette jupe 40 étant destinée à permettre la fixation du drain 36 par sertissage dans l'orifice 22 de la rainure 18 du carter. L'extrémité du corps cylindrique 38 portant la jupe 40 forme un rebord annulaire 44 à la base de cette jupe.The figure 3 schematically shows a drain 36 according to the invention before its mounting on the exhaust casing 10. This drain comprises a tubular cylindrical body 38 and a skirt 40, which is formed at one end of the body 38, which has a thickness less than that of this body, and which extends in the extension of the inner surface 42 of the body, this skirt 40 being intended to allow the attachment of the drain 36 by crimping in the orifice 22 of the groove 18 of the housing. The end of the cylindrical body 38 carrying the skirt 40 forms an annular flange 44 at the base of this skirt.

La figure 4 représente le drain 36 monté dans l'orifice 22 du carter d'échappement 10 après sertissage de sa jupe 40. Cet orifice a été usiné pour permettre ce sertissage afin de fixer le drain au carter, et comprend à une extrémité extérieure à la rainure, une partie cylindrique 46, reliée par un rebord interne 48 à une partie tronconique 50 à l'autre extrémité de l'orifice à l'intérieur de la rainure, cette partie tronconique 50 présentant un angle au centre de 60 degrés environ.The figure 4 represents the drain 36 mounted in the orifice 22 of the exhaust casing 10 after crimping its skirt 40. This orifice has been machined to allow this crimping to fix the drain to the casing, and comprises at one end outside the groove, a cylindrical portion 46, connected by an inner flange 48 to a frustoconical portion 50 at the other end of the orifice within the groove, the frustoconical portion 50 having a center angle of about 60 degrees.

La partie cylindrique 46, dont le diamètre interne est sensiblement égal au diamètre externe du corps cylindrique 38 du drain 36, forme un chambrage ayant un fond 52 limité par le rebord interne 48 de l'orifice et sur lequel est appliqué le rebord annulaire 44 du drain 36.The cylindrical portion 46, whose inner diameter is substantially equal to the outer diameter of the cylindrical body 38 of the drain 36, forms a recess having a bottom 52 bounded by the internal rim 48 of the orifice and on which the annular flange 44 of the drain 36.

La jupe 40 a un diamètre externe sensiblement égal au diamètre interne du rebord 48 et est appliquée sur la partie tronconique 50 de l'orifice 22, pour assurer la retenue du drain au carter.The skirt 40 has an outer diameter substantially equal to the inner diameter of the flange 48 and is applied to the frustoconical portion 50 of the orifice 22, to ensure the retention of the drain to the housing.

Le drain 36 est réalisé dans un alliage métallique à coefficient de dilatation thermique supérieur à celui du carter d'échappement 10. Ainsi, l'élévation de température inhérente au fonctionnement de la turbomachine induit un plaquage et un blocage de la jupe 40 sur les parties cylindrique 48 et tronconique 50 de l'orifice 22, ce qui a pour effet de renforcer la fixation du drain 36 au carter 10.The drain 36 is made of a metal alloy with a coefficient of thermal expansion greater than that of the exhaust casing 10. Thus, the temperature rise inherent in the operation of the turbomachine induces a plating and a locking of the skirt 40 on the parts cylindrical 48 and frustoconical 50 of the orifice 22, which has the effect of reinforcing the attachment of the drain 36 to the casing 10.

L'extrémité libre de la jupe 40 se trouve sensiblement au niveau de la surface de la rainure 18 du carter, afin d'optimiser le sertissage tout en évitant que cette extrémité libre de la jupe dépasse dans la rainure.The free end of the skirt 40 is substantially at the surface of the groove 18 of the housing, in order to optimize the crimping while preventing this free end of the skirt protruding into the groove.

Le sertissage de la jupe 40 est une opération simple et rapide, qui peut par exemple être effectuée au moyen d'un pistolet à sertir, et nécessite environ 30 minutes.The crimping of the skirt 40 is a simple and fast operation, which can for example be performed by means of a crimping gun, and requires about 30 minutes.

Il peut néanmoins être avantageux, pour renforcer encore la fixation du drain 36 au carter d'échappement 10, de prévoir un ou plusieurs points de soudure reliant le drain au carter.It may nevertheless be advantageous, to further strengthen the attachment of the drain 36 to the exhaust casing 10, to provide one or more solder points connecting the drain to the housing.

Par ailleurs, en cas de besoin, par exemple si le drain 36 est détérioré, il est possible de le remplacer par un drain soudé de type connu, après avoir repercé l'orifice 22 de la rainure 18 du carter d'échappement pour obtenir un orifice lisse compatible avec ce type de drain.Furthermore, if necessary, for example if the drain 36 is damaged, it is possible to replace it with a welded drain of known type after having pierced the orifice 22 of the groove 18 of the exhaust casing to obtain a smooth orifice compatible with this type of drain.

Claims (11)

Carter d'échappement (10) de turbomachine, comportant une rainure annulaire (18) percée d'un orifice (22) dans lequel est monté un drain (36) formé d'un corps cylindrique tubulaire (38), pour l'évacuation de liquides retenus dans cette rainure (18), caractérisé en ce que le drain (36) comprend une jupe (40) formée à une extrémité du corps cylindrique (38) et sertie dans l'orifice (22) de la rainure (18) du carter (10) pour la fixation du drain (36) au carter (10).Turbomachine exhaust casing (10) having an annular groove (18) pierced by an orifice (22) in which is mounted a drain (36) formed of a tubular cylindrical body (38) for the evacuation of liquids retained in this groove (18), characterized in that the drain (36) comprises a skirt (40) formed at one end of the cylindrical body (38) and crimped into the orifice (22) of the groove (18) of the housing (10) for fixing the drain (36) to the housing (10). Carter de turbomachine selon la revendication 1, caractérisé en ce que le drain (36) est réalisé dans un alliage métallique ayant un coefficient de dilatation thermique supérieur au coefficient de dilatation thermique du carter (10) autour de l'orifice (22) de montage du drain (36).Turbomachine casing according to claim 1, characterized in that the drain (36) is made of a metal alloy having a coefficient of thermal expansion greater than the coefficient of thermal expansion of the housing (10) around the mounting hole (22). drain (36). Carter de turbomachine selon la revendication 1 ou 2, caractérisé en ce que l'orifice (22) de montage du drain (36) comprend, à une extrémité, une partie cylindrique (46) reliée par un rebord interne (48) à une partie tronconique (50) à l'autre extrémité de l'orifice (22), la jupe (40) du drain (36) étant appliquée sur le rebord interne (48) et sur la partie tronconique (50) après sertissage.Turbomachine casing according to claim 1 or 2, characterized in that the drain mounting hole (22) comprises, at one end, a cylindrical portion (46) connected by an inner flange (48) to a portion frustoconical (50) at the other end of the orifice (22), the skirt (40) of the drain (36) being applied to the inner flange (48) and the frustoconical portion (50) after crimping. Carter de turbomachine selon la revendication 3, caractérisé en ce que le diamètre interne de la partie cylindrique (46) de l'orifice (22) est sensiblement égal au diamètre externe du corps cylindrique (38).Turbomachine casing according to claim 3, characterized in that the internal diameter of the cylindrical portion (46) of the orifice (22) is substantially equal to the external diameter of the cylindrical body (38). Carter de turbomachine selon l'une des revendications 1 à 4, caractérisé en ce que la jupe (40) a une épaisseur inférieure à celle du corps cylindrique (38) et s'étend dans le prolongement de la surface interne (42) du corps cylindrique (38).Turbomachine casing according to one of claims 1 to 4, characterized in that the skirt (40) has a thickness less than that of the cylindrical body (38) and extends in the extension of the internal surface (42) of the body cylindrical (38). Carter de turbomachine selon l'une des revendications précédentes, caractérisé en ce que l'extrémité libre de la jupe (40) après sertissage se trouve sensiblement au niveau de la surface interne de la rainure (18) du carter (10).Turbomachine casing according to one of the preceding claims, characterized in that the free end of the skirt (40) after crimping is substantially at the inner surface of the groove (18) of the casing (10). Carter de turbomachine selon l'une des revendications précédentes, caractérisé en ce que la partie tronconique (50) de l'orifice (22) présente un angle au centre de 60 degrés environ.Turbomachine casing according to one of the preceding claims, characterized in that the frustoconical portion (50) of the orifice (22) has a center angle of about 60 degrees. Carter de turbomachine selon l'une des revendications précédentes, caractérisé en ce que le drain (36) est relié au carter (10) par au moins un point de soudure afin de renforcer sa fixation au carter (10).Turbomachine casing according to one of the preceding claims, characterized in that the drain (36) is connected to the housing (10) by at least one weld point to strengthen its attachment to the housing (10). Turbomachine, telle qu'un turboréacteur d'avion, caractérisée en ce qu'elle comprend un carter d'échappement (10) selon l'une des revendications précédentes.Turbomachine, such as an aircraft turbojet, characterized in that it comprises an exhaust casing (10) according to one of the preceding claims. Drain de carter d'échappement dans une turbomachine, caractérisé en ce qu'il comprend un corps cylindrique tubulaire (38) prolongé à une extrémité par une jupe cylindrique de sertissage (40) ayant une épaisseur inférieure à celle du corps (38).Exhaust housing drain in a turbomachine, characterized in that it comprises a tubular cylindrical body (38) extended at one end by a cylindrical crimping skirt (40) having a thickness less than that of the body (38). Drain selon la revendication 10, caractérisé en ce que la jupe (40) prolonge la surface interne (42) du corps cylindrique (38).Drain according to claim 10, characterized in that the skirt (40) extends the inner surface (42) of the cylindrical body (38).
EP08151545A 2007-03-16 2008-02-18 Turbomachine exhaust case drain Active EP1970541B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0701905A FR2913725B1 (en) 2007-03-16 2007-03-16 TURBOMACHINE EXHAUST CASE DRAIN

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EP1970541A1 true EP1970541A1 (en) 2008-09-17
EP1970541B1 EP1970541B1 (en) 2010-04-07

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US (1) US8277176B2 (en)
EP (1) EP1970541B1 (en)
CA (1) CA2625314C (en)
DE (1) DE602008000925D1 (en)
FR (1) FR2913725B1 (en)
RU (1) RU2472004C2 (en)

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FR3098242B1 (en) 2019-07-04 2021-06-25 Safran Aircraft Engines Fluid recuperator assembly for gas turbomachine
FR3098243B1 (en) 2019-07-04 2021-06-04 Safran Aircraft Engines Fluid recuperator assembly for gas turbomachine

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US20080226445A1 (en) 2008-09-18
FR2913725B1 (en) 2011-10-28
RU2472004C2 (en) 2013-01-10
EP1970541B1 (en) 2010-04-07
CA2625314C (en) 2015-08-11
DE602008000925D1 (en) 2010-05-20
RU2008110028A (en) 2009-09-20
FR2913725A1 (en) 2008-09-19
US8277176B2 (en) 2012-10-02
CA2625314A1 (en) 2008-09-16

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