EP2071192A1 - Device for taking an air sample in a turbomachine compressor - Google Patents

Device for taking an air sample in a turbomachine compressor Download PDF

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Publication number
EP2071192A1
EP2071192A1 EP08168909A EP08168909A EP2071192A1 EP 2071192 A1 EP2071192 A1 EP 2071192A1 EP 08168909 A EP08168909 A EP 08168909A EP 08168909 A EP08168909 A EP 08168909A EP 2071192 A1 EP2071192 A1 EP 2071192A1
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EP
European Patent Office
Prior art keywords
compressor
sheet
air
screen
flange
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Granted
Application number
EP08168909A
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German (de)
French (fr)
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EP2071192B1 (en
Inventor
Antoine Robert Alain Brunet
Laurent Jablonsky
Sébastien Juste
Julien Sedlak
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Safran Aircraft Engines SAS
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SNECMA SAS
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Publication of EP2071192A1 publication Critical patent/EP2071192A1/en
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    • 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
    • F04D29/545—Ducts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
    • F04D27/02—Surge control
    • F04D27/0207—Surge control by bleeding, bypassing or recycling fluids
    • F04D27/0215—Arrangements therefor, e.g. bleed or by-pass valves

Definitions

  • the invention relates to a turbomachine compressor equipped with an air sampling system and to a turbomachine such as a turbojet engine or an airplane turboprop engine equipped with a compressor of this type.
  • a turbomachine with a double flow comprises an upstream air inlet which is divided into a primary air flow supplying compression and combustion stages, and a secondary air flow bypassing the turbojet engine and joining the turbojet engine outlet. the primary air flow.
  • a portion of the air passing through the compressor is taken for various uses, including pressurizing the cabin, defrosting or ventilating the turbine of the turbojet engine to cool it.
  • Air sampling is generally carried out in the high-pressure compressor which comprises an outer casing for stiffening the compression stage and a wall delimiting externally the flow vein of the primary air flow inside the high-pressure compressor. and formed by an arrangement of annular segments, some bearing rectifiers and the others, alternately arranged with the previous ones, extend to the radially outer end of the moving wheels.
  • the outer casing comprises an orifice on which is mounted a suction duct and which opens into an annular space formed between an annular segment of a rectifier stage and an annular segment of a mobile wheel.
  • part of the air circulating in the primary air stream of the high-pressure compressor is taken from the inter-segment space and conveyed to equipment requiring pressurized air by means of the suction duct opening in the outer casing.
  • the functioning engine In certain critical situations, such as an engine failure, the functioning engine must be able to withstand all air sampling. For example, in normal operation, the maximum sampling is about 8% of the average compressor flow and in case of failure of one engine, the other engine must be able to provide up to 16% of its average flow, which can 'prove impossible in the case of strong heterogeneities of static pressure around the axis of the compressor.
  • the invention particularly aims to limit the static pressure variations around the axis of the turbomachine while maintaining the same air bleed capacity in the high pressure compressor.
  • a turbomachine compressor such as a high-pressure compressor, comprising air sampling means comprising a duct whose suction end opens into an outer casing of the compressor at a mobile wheel and a rectifier stage of the compressor, characterized in that a ring-shaped screen plate is mounted radially inside the housing opposite a portion of the suction end of the duct so as to standardize 360 ° air sampling around the compressor axis.
  • the screen sheet comprises at its upstream end radial support means on a housing flange, the downstream end of the sheet being fixed by screws on an annular flange of the rectifier stage. mounted downstream of the moving wheel.
  • the screen sheet is thus mounted on pre-existing mechanical parts, and its integration into the environment of the high-pressure compressor does not require any structural modification thereof.
  • the support means of the screen sheet comprise cylindrical rims extending upstream.
  • the screen sheet preferably extends over less than 360 ° and has a cylindrical flange at each of its circumferential ends. It can thus be supported on the flange of the housing only at its circumferential ends and the air flow can flow between the flange and the upstream end of the sheet.
  • the limitation of the circumferential extent of the sheet makes it possible to maintain a mean static pressure around the axis of the compressor which is similar to that of the prior art, which avoids resorting to other sources of sampling. air that would increase fuel consumption.
  • the screen sheet extends over approximately 234 ° and its end cylindrical rims extend angularly over several tens of degrees.
  • the downstream end of the screen sheet may comprise large diameter holes alternately arranged with small diameter holes provided for the passage of fixing screws.
  • the screen plate is fixed to the annular flange of the floor downstream rectifier only by screws inserted into the small diameter holes and tightened on the flange.
  • Large diameter holes are used only for the passage of screw heads securing the flange of the downstream rectifier with a flange of the next downstream rectifier stage.
  • the screen sheet does not participate in the mechanical strength of the compressor stage, it is not necessary to fix it to the flange of the downstream rectifier stage with a large number of fixing screws.
  • Support of the upstream end of the screen plate can be performed with an elastic preload bearing on the flange of the housing.
  • the rectifier stage located upstream of the mobile wheel is fixed to the flange of the housing by a shell comprising air passage holes, of which those located at a central portion of the screen plate are completely closed while those located opposite the end portions of the screen plate are 50% closed.
  • the total or partial closure of the holes of the shell makes it possible to better control the distribution of the air sample around the axis of the turbomachine.
  • the screen sheet also comprises at least one orifice of passage of an endoscope for checking the state of compressor parts located radially inside the screen sheet.
  • the invention also proposes a ring-shaped screen sheet intended to be used in a compressor of the type described above, characterized in that its section is of L-shaped and in that it comprises a cylindrical wall connected to one end. a radial wall having fixing screw holes, the other end being connected to a frustoconical wall.
  • the frustoconical wall of the screen sheet has radial flanges oriented outwardly at its circumferential ends.
  • the invention also relates to a turbomachine, such as a turbojet or an airplane turboprop, characterized in that it comprises a compressor of the type described above.
  • FIG 1 represents a downstream part of a high-pressure compressor 10 of axis 12, mounted downstream of a low-pressure compressor and upstream of a combustion chamber.
  • the high-pressure compressor 10 comprises an outer casing 14 and a wall 16 in which a plurality of movable wheels 18, 20, 22 are rotated alternately with rectifying stages 24, 26, 28.
  • the wall 16 comprises a series of annular segments of which the ones 30, 32, 34 carry the radially outer ends of the rectifiers 24, 26, 28 and the others 36, 38, 40, arranged alternately with the previous ones, are opposite the radially outer ends of the mobile wheels 18, 20, 22
  • the annular segments are interconnected by means of annular flanges 42, 44, 46, 48 and are connected together to the outer casing 14.
  • An air sampling is provided between a rectifier stage 24 and a downstream movable wheel 18 by axially spacing the downstream end of the segment 30 of the upstream rectifier stage 24 and the upstream end of the segment 36 disposed opposite the movable wheel 18.
  • the segment 30 of the upstream rectifier stage 24 is connected to the outer casing 14 by a ferrule 52 extending downstream and fixed at its radially outer end to an inner flange 54 of the housing 14.
  • the ferrule 52 comprises a plurality of air passage holes 56 distributed on its circumference.
  • the means for withdrawing air from the compressor 10 comprise a duct 58 whose suction end is mounted on an orifice 60 of the outer casing 14. This orifice 60 is positioned axially on the outer casing 14 so that it is located opposite the inter-segment space 61. Its diameter is such that it opens on either side of the ferrule 52 for fixing the upstream rectifier stage 24.
  • the flow of air entering the turbomachine is divided into two parts, one of which corresponds to a primary air flow through the high-pressure compressor 10.
  • This graph shows that most of the air sampling is done in the immediate vicinity and right of the suction hole 60, which leads to significant static pressure variations around the axis 12 of the high-pressure compressor 10.
  • the invention overcomes this problem as well as those mentioned above by mounting a sheet 62 of annular shape inside the outer casing 14, to form a screen facing a portion of the suction end of the duct 58 so as to standardize the air sampling over 360 ° around the axis 12 of the high-pressure compressor 10 ( figure 3 and 4 ).
  • the screen sheet 62 extends over less than 360 ° and has an axial section of L-shape. It comprises a cylindrical wall 64 connected at its downstream end to a radial wall 66, its upstream end being connected to a frustoconical wall 68 to section increasing upstream.
  • the upstream end of the frustoconical wall 68 comprises radial support means on the flange 54 for fixing the ferrule 52 of the upstream rectifier stage 24 ( figure 3 and 5 ).
  • These means include ledges 70 of cylindrical shape extending upstream.
  • the flanges 70 are formed at each of the circumferential ends of the sheet 62 and extend angularly over several tens of degrees.
  • the radial wall 66 is fixed to annular flanges 42, 44 for fixing the annular segments 36, 38. It comprises small diameter holes 72 alternating with holes of larger diameter 74.
  • the small diameter holes 72 allow the passage of fastening screw and the tightening of the screw heads on the radial wall 66.
  • the large diameter holes 74 have a sufficiently large diameter to allow the passage of the heads of these same screws. These holes 74 are not used for clamping the radial wall 66.
  • the holes 56 of the ferrule 52 for fixing the upstream rectifier stage 24 which are situated at the central part of the screen plate 62 are completely closed while the holes 56 situated opposite the end portions 70 of the sheet metal screen 66 are 50% closed.
  • the air taken from the compressor 10 flows between the radially inner end of the flange 54 for fixing the upstream rectifier stage 24 and the upstream end of the frustoconical wall 68 of the screen plate. 62 (arrow F1).
  • the reduced spacing between the flange 54 and the upstream end of the sheet 62 as well as the total closure of the holes 56 of the upstream shell 52 in the central portion of the sheet 62 limits the air intake to the right of the led 58, which avoids a drop in the static pressure in this place (curve B of the figure 2 ).
  • the arrow F2 indicates the flow of air coming from the compressor 10 and passing through the unsealed or partially closed holes 56 of the ferrule 52 of the upstream rectifier stage 24 which are located near the circumferential ends 70 of the plate 62.
  • the air taken in the high pressure compressor 10 flows between the sheet 62 and the outer casing 14 and then sucked into the conduit 58 (arrows F3).
  • this sheet does not reduce the air sampling capacity of the duct since the average static pressures with and without screen plate 62 are substantially similar and of the order of 2.75 u.a.
  • the screen plate 62 may be mounted at its upstream end with an elastic preload bearing on the flange of the outer casing, which ensures a permanent contact of the sheet on the flange. In operation, the air sucked into the duct 58 makes it possible to further press the upstream end of the sheet on the flange 54 of the casing 14.
  • a compressor casing usually comprises one or more orifices allowing the passage of an endoscope 75 for exploration of the inside of the compressor.
  • the sheet 62 may comprise at least one orifice 76 allowing the passage of such an endoscope.
  • the screen sheet extends over at least 180 ° and at most about 270 °.
  • the screen sheet extends over 234 ° and comprises a cylindrical flange 70 extending between 0 ° and 36 °, the other flange extending between 180 ° and 234 °.
  • the axial dimension of the sheet is 36.3 mm at its circumferential ends and 30 mm outside.
  • the thickness of the sheet is of the order of 1 mm.
  • the sheet 62 may comprise in its median part and at its upstream end an upwardly projecting flange of smaller axial dimension than the cylindrical flanges of the circumferential ends 70. flange serves to stiffen the sheet and thus raise the frequencies of its own modes of vibration to avoid any phenomenon of resonance of the screen sheet when it is subjected to vibrations during the passage of air and operation of the turbomachine.
  • the axial dimension of this rim may be 2 mm, for example.
  • the integration of the screen plate 62 according to the invention between the outer casing 14 and the wall 16 does not require any structural modification of the compressor 10 since this sheet bears at one end on a flange 54 used for fixing the upstream shell. 52 and is fixed on flanges 42, 44 for securing segments 36, 38.
  • This sheet 62 can thus be mounted in all turbomachines during manufacture or during a maintenance operation.
  • the figure 8 represents the mounting of fixing screws 78 in the holes 72 of the screen plate 62.
  • the presence of a frustoconical wall 68 at the upstream end of the cylindrical wall 62 makes it possible to easily introduce the screws 78 into the holes of the flange 42.

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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 compressor (10) has air bleed units including a duct (58) whose suction end is emerged in an external casing (14) of the compressor at the level of a movable wheel (18) and a rectifier stage (24) of the compressor. An annular shaped screen sheet (62) is radially mounted inside the casing with respect to a part of the suction end of the duct in order to homogenize the air bleed at 360 degrees around an axis (12) of the compressor.

Description

L'invention se rapporte à un compresseur de turbomachine équipé d'un système de prélèvement d'air ainsi qu'à une turbomachine telle qu'un turboréacteur ou un turbopropulseur d'avion équipée d'un compresseur de ce type.The invention relates to a turbomachine compressor equipped with an air sampling system and to a turbomachine such as a turbojet engine or an airplane turboprop engine equipped with a compressor of this type.

Une turbomachine à double flux comprend une entrée d'air à l'amont qui est divisée en un flux d'air primaire alimentant des étages de compression et de combustion, et un flux d'air secondaire contournant le turboréacteur et rejoignant en sortie du turboréacteur le flux d'air primaire.A turbomachine with a double flow comprises an upstream air inlet which is divided into a primary air flow supplying compression and combustion stages, and a secondary air flow bypassing the turbojet engine and joining the turbojet engine outlet. the primary air flow.

Une portion de l'air traversant le compresseur est prélevée pour divers usages, dont la mise sous pression de la cabine, le dégivrage ou la ventilation de la turbine du turboréacteur pour la refroidir.A portion of the air passing through the compressor is taken for various uses, including pressurizing the cabin, defrosting or ventilating the turbine of the turbojet engine to cool it.

Le prélèvement d'air est généralement effectué dans le compresseur haute pression qui comprend un carter externe destiné à rigidifier l'étage de compression et une paroi délimitant extérieurement la veine d'écoulement du flux d'air primaire à l'intérieur du compresseur haute pression et formée par un agencement de segments annulaires dont les uns portent des redresseurs et les autres, disposés en alternance avec les précédents, s'étendent à l'extrémité radialement externe de roues mobiles.Air sampling is generally carried out in the high-pressure compressor which comprises an outer casing for stiffening the compression stage and a wall delimiting externally the flow vein of the primary air flow inside the high-pressure compressor. and formed by an arrangement of annular segments, some bearing rectifiers and the others, alternately arranged with the previous ones, extend to the radially outer end of the moving wheels.

Le carter externe comprend un orifice sur lequel est monté un conduit d'aspiration et qui débouche dans un espace annulaire réalisé entre un segment annulaire d'un étage redresseur et un segment annulaire d'une roue mobile.The outer casing comprises an orifice on which is mounted a suction duct and which opens into an annular space formed between an annular segment of a rectifier stage and an annular segment of a mobile wheel.

En fonctionnement, une partie de l'air circulant dans la veine d'air primaire du compresseur haute pression est prélevée dans l'espace inter-segments et acheminée jusqu'aux équipements requérant de l'air sous pression grâce au conduit d'aspiration débouchant dans le carter externe.In operation, part of the air circulating in the primary air stream of the high-pressure compressor is taken from the inter-segment space and conveyed to equipment requiring pressurized air by means of the suction duct opening in the outer casing.

Cependant, le prélèvement d'air est maximal au droit de l'extrémité du conduit d'aspiration, ce qui conduit à une chute de la pression statique en cet endroit. Ainsi, on constate de fortes hétérogénéités de pression statique dans l'espace inter-segments autour de l'axe de la turbomachine, ce qui diminue les performances de la turbomachine. Ces hétérogénéités sont d'autant plus importantes que le prélèvement d'air nécessaire est important.However, the air intake is maximum at the right end suction pipe, which leads to a drop in static pressure at this location. Thus, there are strong static pressure heterogeneities in the inter-segment space around the axis of the turbomachine, which decreases the performance of the turbomachine. These heterogeneities are all the more important that the necessary air intake is important.

Dans certaines situations critiques telles qu'une panne moteur, le moteur en état de fonctionner doit pouvoir supporter la totalité des prélèvements d'air. Par exemple, en fonctionnement normal, le prélèvement maximal représente environ 8% du débit moyen du compresseur et en cas de panne d'un moteur, l'autre moteur doit pouvoir fournir jusqu'à 16% de son débit moyen, ce qui peut s'avérer impossible dans le cas de fortes hétérogénéités de pression statique autour de l'axe du compresseur.In certain critical situations, such as an engine failure, the functioning engine must be able to withstand all air sampling. For example, in normal operation, the maximum sampling is about 8% of the average compressor flow and in case of failure of one engine, the other engine must be able to provide up to 16% of its average flow, which can 'prove impossible in the case of strong heterogeneities of static pressure around the axis of the compressor.

La multiplication autour du carter externe du nombre de conduits d'aspiration n'est pas une solution envisageable puisque cela compliquerait la tuyauterie d'amenée d'air sous pression et augmenterait la masse de la turbomachine.The multiplication around the outer casing of the number of suction ducts is not a possible solution since it would complicate the pressurized air supply piping and increase the mass of the turbomachine.

L'invention a notamment pour but de limiter les variations de pression statique autour de l'axe de la turbomachine tout en conservant la même capacité de prélèvement d'air dans le compresseur haute pression.The invention particularly aims to limit the static pressure variations around the axis of the turbomachine while maintaining the same air bleed capacity in the high pressure compressor.

Elle propose, à cet effet, un compresseur de turbomachine, tel qu'un compresseur haute pression, comprenant des moyens de prélèvement d'air comportant un conduit dont l'extrémité d'aspiration débouche dans un carter externe du compresseur au niveau d'une roue mobile et d'un étage redresseur du compresseur, caractérisé en ce qu'une tôle écran de forme annulaire est montée radialement à l'intérieur du carter en regard d'une partie de l'extrémité d'aspiration du conduit de manière à uniformiser le prélèvement d'air sur 360° autour de l'axe du compresseur.It proposes, for this purpose, a turbomachine compressor, such as a high-pressure compressor, comprising air sampling means comprising a duct whose suction end opens into an outer casing of the compressor at a mobile wheel and a rectifier stage of the compressor, characterized in that a ring-shaped screen plate is mounted radially inside the housing opposite a portion of the suction end of the duct so as to standardize 360 ° air sampling around the compressor axis.

L'utilisation d'une tôle écran dont une partie occulte partiellement l'extrémité du conduit d'aspiration permet de limiter le prélèvement d'air en cet endroit et évite ainsi une chute sensible de la pression statique en cet endroit. Pour cela, on augmente le prélèvement d'air dans les parties de la veine qui sont angulairement plus éloignées de l'extrémité du conduit d'aspiration. La tôle permet ainsi de répartir sur 360° le prélèvement d'air dans la veine du compresseur, ce qui limite les hétérogénéités angulaires de pression statique et améliore les performances de la turbomachine.The use of a screen sheet part of which partially occludes the end of the suction duct limits air intake in this place and avoids a significant drop in static pressure in this area. For this, it increases the air intake in the parts of the vein which are angularly further from the end of the suction duct. The sheet thus makes it possible to distribute 360 ° of the air sample in the vein of the compressor, which limits the angular heterogeneities of static pressure and improves the performance of the turbomachine.

Selon une autre caractéristique de l'invention, la tôle écran comprend à son extrémité amont des moyens d'appui radial sur une bride du carter, l'extrémité aval de la tôle étant fixée par des vis sur une bride annulaire de l'étage redresseur monté en aval de la roue mobile.According to another characteristic of the invention, the screen sheet comprises at its upstream end radial support means on a housing flange, the downstream end of the sheet being fixed by screws on an annular flange of the rectifier stage. mounted downstream of the moving wheel.

La tôle écran est ainsi montée sur des pièces mécaniques préexistantes, et son intégration dans l'environnement du compresseur haute pression ne nécessite aucune modification structurelle de celui-ci.The screen sheet is thus mounted on pre-existing mechanical parts, and its integration into the environment of the high-pressure compressor does not require any structural modification thereof.

Avantageusement, les moyens d'appui de la tôle écran comprennent des rebords de forme cylindrique s'étendant vers l'amont.Advantageously, the support means of the screen sheet comprise cylindrical rims extending upstream.

La tôle écran s'étend préférentiellement sur moins de 360° et comporte un rebord cylindrique à chacune de ses extrémités circonférentielles. Elle peut ainsi être en appui sur la bride du carter uniquement à ses extrémités circonférentielles et le flux d'air peut circuler entre la bride et l'extrémité amont de la tôle. La limitation de l'étendue circonférentielle de la tôle permet de conserver une pression statique moyenne autour de l'axe du compresseur qui est similaire à celle de la technique antérieure, ce qui évite d'avoir recours à d'autres sources de prélèvement d'air qui augmenteraient la consommation de carburant.The screen sheet preferably extends over less than 360 ° and has a cylindrical flange at each of its circumferential ends. It can thus be supported on the flange of the housing only at its circumferential ends and the air flow can flow between the flange and the upstream end of the sheet. The limitation of the circumferential extent of the sheet makes it possible to maintain a mean static pressure around the axis of the compressor which is similar to that of the prior art, which avoids resorting to other sources of sampling. air that would increase fuel consumption.

Dans un mode de réalisation de l'invention, la tôle écran s'étend sur 234° environ et ses rebords cylindriques d'extrémité s'étendent angulairement sur plusieurs dizaines de degrés.In one embodiment of the invention, the screen sheet extends over approximately 234 ° and its end cylindrical rims extend angularly over several tens of degrees.

L'extrémité aval de la tôle écran peut comprendre des trous de grand diamètre disposés en alternance avec des trous de petit diamètre prévus pour le passage de vis de fixation.The downstream end of the screen sheet may comprise large diameter holes alternately arranged with small diameter holes provided for the passage of fixing screws.

Ainsi la tôle écran n'est fixée à la bride annulaire de l'étage redresseur aval que par des vis insérées dans les trous de petits diamètre et serrées sur la bride. Les trous de grand diamètre servent uniquement au passage de têtes de vis de fixation de la bride du redresseur aval avec une bride de l'étage redresseur aval suivant. La tôle écran ne participant pas à la tenue mécanique de l'étage de compresseur, il n'est pas nécessaire de la fixer à la bride de l'étage redresseur aval avec un nombre important de vis de fixation.Thus the screen plate is fixed to the annular flange of the floor downstream rectifier only by screws inserted into the small diameter holes and tightened on the flange. Large diameter holes are used only for the passage of screw heads securing the flange of the downstream rectifier with a flange of the next downstream rectifier stage. As the screen sheet does not participate in the mechanical strength of the compressor stage, it is not necessary to fix it to the flange of the downstream rectifier stage with a large number of fixing screws.

L'appui de l'extrémité amont de la tôle écran peut s'effectuer avec une précontrainte élastique en appui sur la bride du carter.Support of the upstream end of the screen plate can be performed with an elastic preload bearing on the flange of the housing.

L'étage redresseur situé en amont de la roue mobile est fixé à la bride du carter par une virole comprenant des trous de passages d'air, dont ceux situés au niveau d'une partie centrale de la tôle écran sont totalement obturés tandis que ceux situés en regard des parties d'extrémité de la tôle écran sont obturés à 50 %.The rectifier stage located upstream of the mobile wheel is fixed to the flange of the housing by a shell comprising air passage holes, of which those located at a central portion of the screen plate are completely closed while those located opposite the end portions of the screen plate are 50% closed.

L'obturation totale ou partielle des trous de la virole permet de mieux contrôler la répartition du prélèvement d'air autour de l'axe de la turbomachine.The total or partial closure of the holes of the shell makes it possible to better control the distribution of the air sample around the axis of the turbomachine.

La tôle écran comprend également au moins un orifice de passage d'un endoscope permettant la vérification de l'état de pièces du compresseur situées radialement à l'intérieur de la tôle écran.The screen sheet also comprises at least one orifice of passage of an endoscope for checking the state of compressor parts located radially inside the screen sheet.

L'invention propose également une tôle écran de forme annulaire destinée à être utilisée dans un compresseur du type décrit ci-dessus, caractérisée en ce que sa section est de forme en L et en ce qu'elle comprend une paroi cylindrique raccordée à une extrémité à une paroi radiale comportant des trous de passage de vis de fixation, l'autre extrémité étant raccordée à une paroi tronconique.The invention also proposes a ring-shaped screen sheet intended to be used in a compressor of the type described above, characterized in that its section is of L-shaped and in that it comprises a cylindrical wall connected to one end. a radial wall having fixing screw holes, the other end being connected to a frustoconical wall.

Selon une autre caractéristique, la paroi tronconique de la tôle écran comporte des rebords radiaux orientés vers l'extérieur à ses extrémités circonférentielles.According to another feature, the frustoconical wall of the screen sheet has radial flanges oriented outwardly at its circumferential ends.

L'invention concerne encore une turbomachine, telle qu'un turboréacteur ou un turbopropulseur d'avion, caractérisée en ce qu'elle comprend un compresseur du type décrit précédemment.The invention also relates to a turbomachine, such as a turbojet or an airplane turboprop, characterized in that it comprises a compressor of the type described above.

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

  • la figure 1 est une vue schématique en coupe axiale d'une partie d'un compresseur haute pression d'une turbomachine comprenant un dispositif de prélèvement d'air selon la technique antérieure ;
  • la figure 2 est un graphe représentant les variations de la pression statique en fonction de la position angulaire autour de l'axe de la turbomachine;
  • la figure 3 est une vue schématique en coupe axiale d'une partie d'un compresseur haute pression de turbomachine comprenant une tôle écran selon l'invention;
  • la figure 4 est une vue schématique de dessus d'une partie de la tôle écran montée au droit du trou d'aspiration d'air formé dans le carter externe ;
  • la figure 5 est une vue schématique en perspective d'un endoscope monté sur le carter externe et inséré dans un orifice de la tôle écran selon l'invention ;
  • la figure 6 est une vue schématique en perspective d'une tôle écran selon l'invention;
  • la figure 7 est une vue schématique en perspective et en coupe du trou de prélèvement d'air dans le carter externe et de la tôle écran selon l'invention;
  • la figure 8 est une vue schématique à plus grande échelle illustrant le montage des vis de fixation de la tôle écran sur une bride annulaire d'un étage redresseur.
The invention will be better understood and other details, advantages and features of the invention will appear on reading the following description given by way of non-limiting example, with reference to the accompanying drawings in which:
  • the figure 1 is a schematic view in axial section of a portion of a high pressure compressor of a turbomachine comprising an air bleed device according to the prior art;
  • the figure 2 is a graph representing the variations of the static pressure as a function of the angular position around the axis of the turbomachine;
  • the figure 3 is a schematic view in axial section of a portion of a high pressure turbine engine compressor comprising a screen plate according to the invention;
  • the figure 4 is a schematic view from above of a portion of the screen sheet mounted to the right of the air suction hole formed in the outer casing;
  • the figure 5 is a schematic perspective view of an endoscope mounted on the outer casing and inserted into an orifice of the screen plate according to the invention;
  • the figure 6 is a schematic perspective view of a screen plate according to the invention;
  • the figure 7 is a schematic perspective view in section of the air bleed hole in the outer casing and the screen plate according to the invention;
  • the figure 8 is a schematic view on a larger scale illustrating the mounting of the fixing screws of the screen sheet on an annular flange of a rectifier stage.

On se réfère tout d'abord à la figure 1 qui représente une partie aval d'un compresseur haute pression 10 d'axe 12, monté en aval d'un compresseur basse-pression et en amont d'une chambre de combustion. Le compresseur haute pression 10 comprend un carter externe 14 et une paroi 16 dans laquelle tournent une pluralité de roues mobiles 18, 20, 22 agencées en alternance avec des étages redresseurs 24, 26, 28. La paroi 16 comprend une série de segments annulaires dont les uns 30, 32, 34 portent les extrémités radialement externes des redresseurs 24, 26, 28 et les autres 36, 38, 40, disposés en alternance avec les précédents, sont en regard des extrémités radialement externes des roues mobiles 18, 20, 22 portées par un arbre de rotation 27. Les segments annulaires sont reliés entre eux au moyen de brides annulaires 42, 44, 46, 48 et sont reliés ensemble au carter externe 14.We first refer to the figure 1 which represents a downstream part of a high-pressure compressor 10 of axis 12, mounted downstream of a low-pressure compressor and upstream of a combustion chamber. The high-pressure compressor 10 comprises an outer casing 14 and a wall 16 in which a plurality of movable wheels 18, 20, 22 are rotated alternately with rectifying stages 24, 26, 28. The wall 16 comprises a series of annular segments of which the ones 30, 32, 34 carry the radially outer ends of the rectifiers 24, 26, 28 and the others 36, 38, 40, arranged alternately with the previous ones, are opposite the radially outer ends of the mobile wheels 18, 20, 22 The annular segments are interconnected by means of annular flanges 42, 44, 46, 48 and are connected together to the outer casing 14.

Un prélèvement d'air est prévu entre un étage redresseur 24 et une roue mobile aval 18 par écartement axial de l'extrémité aval du segment 30 de l'étage redresseur amont 24 et de l'extrémité amont du segment 36 disposé en regard de la roue mobile 18. Le segment 30 de l'étage redresseur amont 24 est relié au carter externe 14 par une virole 52 s'étendant vers l'aval et fixée à son extrémité radialement externe sur une bride interne 54 du carter 14. La virole 52 comprend une multitude de trous de passage d'air 56 répartis sur sa circonférence. Les moyens de prélèvement d'air dans le compresseur 10 comprennent un conduit 58 dont l'extrémité d'aspiration est montée sur un orifice 60 du carter externe 14. Cet orifice 60 est positionné axialement sur le carter externe 14 de telle manière à ce qu'il soit situé en regard de l'espace inter-segments 61. Son diamètre est tel qu'il débouche de part et d'autre de la virole 52 de fixation de l'étage redresseur amont 24.An air sampling is provided between a rectifier stage 24 and a downstream movable wheel 18 by axially spacing the downstream end of the segment 30 of the upstream rectifier stage 24 and the upstream end of the segment 36 disposed opposite the movable wheel 18. The segment 30 of the upstream rectifier stage 24 is connected to the outer casing 14 by a ferrule 52 extending downstream and fixed at its radially outer end to an inner flange 54 of the housing 14. The ferrule 52 comprises a plurality of air passage holes 56 distributed on its circumference. The means for withdrawing air from the compressor 10 comprise a duct 58 whose suction end is mounted on an orifice 60 of the outer casing 14. This orifice 60 is positioned axially on the outer casing 14 so that it is located opposite the inter-segment space 61. Its diameter is such that it opens on either side of the ferrule 52 for fixing the upstream rectifier stage 24.

En fonctionnement, le flux d'air entrant dans la turbomachine est divisé en deux parties dont l'une correspond à un flux d'air primaire traversant le compresseur haute-pression 10. Une portion de l'air y circulant s'échappe par l'espace inter-segments 61 et passe de part et d'autre de la virole amont 52 au travers des trous 56 pour être aspiré dans le conduit 58 permettant d'amener l'air sous pression vers les équipements qui en ont besoin.In operation, the flow of air entering the turbomachine is divided into two parts, one of which corresponds to a primary air flow through the high-pressure compressor 10. A portion of the air flowing there through the intersegment space 61 and passes on either side of the upstream ferrule 52 through the holes 56 to be sucked into the conduit 58 to bring the air under pressure to the equipment in need.

En figure 2 sont représentées sur la courbe A les variations de la pression statique mesurée au niveau de l'espace inter-segments 61 en fonction de la position angulaire autour de l'axe 12 du compresseur 10, pour un dispositif de prélèvement tel que précédemment décrit. Le zéro sur l'axe des abscisses représente la verticale, l'évolution croissante de l'angle se faisant dans le sens horaire par rapport à un compresseur vu de l'arrière et le trou 60 du conduit d'aspiration 58 étant centré à 114°.In figure 2 are represented on curve A the variations of the static pressure measured at the inter-segment space 61 as a function of the angular position around the axis 12 of the compressor 10, for a sampling device as previously described. The zero on the abscissa represents the vertical, the increasing evolution of the angle being in the clockwise direction with respect to a compressor seen from the rear and the hole 60 of the suction duct 58 being centered at 114. °.

On constate sur ce graphe qu'un minimum de pression statique d'environ 2,45 u.a. (unités arbitraires) est obtenu pour une position angulaire de l'ordre de 114° correspondant à la position du conduit d'aspiration 58. La pression statique augmente dès que l'on s'éloigne du conduit d'aspiration 58 et le maximum de pression statique atteint est de l'ordre de 2,9 u.a.It can be seen from this graph that a minimum static pressure of approximately 2.45 ua (arbitrary units) is obtained for an angular position of the order of 114 ° corresponding to the position of the suction duct 58. Static pressure increases as one moves away from the suction duct 58 and the maximum static pressure reached is of the order of 2.9 ua

Ce graphique montre que l'essentiel du prélèvement d'air est effectué au voisinage immédiat et au droit du trou d'aspiration 60, ce qui conduit à d'importantes variations de pression statique autour de l'axe 12 du compresseur haute pression 10.This graph shows that most of the air sampling is done in the immediate vicinity and right of the suction hole 60, which leads to significant static pressure variations around the axis 12 of the high-pressure compressor 10.

L'invention permet de remédier à ce problème ainsi qu'à ceux mentionnés précédemment en montant une tôle 62 de forme annulaire à l'intérieur du carter externe 14, pour former un écran en regard d'une partie de l'extrémité d'aspiration du conduit 58 de manière à uniformiser le prélèvement d'air sur 360° autour de l'axe 12 du compresseur haute pression 10 (figure 3 et 4).The invention overcomes this problem as well as those mentioned above by mounting a sheet 62 of annular shape inside the outer casing 14, to form a screen facing a portion of the suction end of the duct 58 so as to standardize the air sampling over 360 ° around the axis 12 of the high-pressure compressor 10 ( figure 3 and 4 ).

La tôle écran 62 s'étend sur moins de 360° et a une section axiale de forme en L. Elle comprend une paroi cylindrique 64 raccordée à son extrémité aval à une paroi radiale 66, son extrémité amont étant raccordée à une paroi tronconique 68 à section augmentant vers l'amont.The screen sheet 62 extends over less than 360 ° and has an axial section of L-shape. It comprises a cylindrical wall 64 connected at its downstream end to a radial wall 66, its upstream end being connected to a frustoconical wall 68 to section increasing upstream.

L'extrémité amont de la paroi tronconique 68 comprend des moyens d'appui radial sur la bride 54 de fixation de la virole 52 de l'étage redresseur amont 24 (figure 3 et 5). Ces moyens comprennent des rebords 70 de forme cylindrique s'étendant vers l'amont. Les rebords 70 sont formés à chacune des extrémités circonférentielles de la tôle 62 et s'étendent angulairement sur plusieurs dizaines de degrés.The upstream end of the frustoconical wall 68 comprises radial support means on the flange 54 for fixing the ferrule 52 of the upstream rectifier stage 24 ( figure 3 and 5 ). These means include ledges 70 of cylindrical shape extending upstream. The flanges 70 are formed at each of the circumferential ends of the sheet 62 and extend angularly over several tens of degrees.

La paroi radiale 66 est fixée à des brides annulaires 42, 44 de fixation des segments annulaires 36, 38. Elle comprend des trous de petit diamètre 72 disposés en alternance avec des trous de plus grand diamètre 74. Les trous de petit diamètre 72 permettent le passage de vis de fixation et le serrage des têtes des vis sur la paroi radiale 66. Les trous de grand diamètre 74 ont un diamètre suffisamment grand pour permettre le passage des têtes de ces mêmes vis. Ces trous 74 ne servent pas au serrage de la paroi radiale 66.The radial wall 66 is fixed to annular flanges 42, 44 for fixing the annular segments 36, 38. It comprises small diameter holes 72 alternating with holes of larger diameter 74. The small diameter holes 72 allow the passage of fastening screw and the tightening of the screw heads on the radial wall 66. The large diameter holes 74 have a sufficiently large diameter to allow the passage of the heads of these same screws. These holes 74 are not used for clamping the radial wall 66.

Les trous 56 de la virole 52 de fixation de l'étage redresseur amont 24 qui sont situés au niveau de la partie centrale de la tôle écran 62 sont totalement obturés tandis que les trous 56 situés en regard des parties d'extrémités 70 de la tôle écran 66 sont obturés à 50%.The holes 56 of the ferrule 52 for fixing the upstream rectifier stage 24 which are situated at the central part of the screen plate 62 are completely closed while the holes 56 situated opposite the end portions 70 of the sheet metal screen 66 are 50% closed.

Lors du fonctionnement de la turbomachine (figure 8), une partie de l'air circulant à l'intérieur de la veine d'air comprimé s'échappe à travers l'espace inter-segments 61.During operation of the turbomachine ( figure 8 ), a part of the air circulating inside the compressed air duct escapes through the inter-segment space 61.

Au droit du conduit d'aspiration, l'air prélevé dans le compresseur 10 circule entre l'extrémité radialement interne de la bride 54 de fixation de l'étage redresseur amont 24 et l'extrémité amont de la paroi tronconique 68 de la tôle écran 62 (flèche F1). L'espacement réduit entre la bride 54 et l'extrémité amont de la tôle 62 ainsi que l'obturation totale des trous 56 de la virole amont 52 dans la partie centrale de la tôle 62 permet de limiter le prélèvement d'air au droit du conduit 58, ce qui évite une chute de la pression statique en cet endroit (courbe B de la figure 2).At the right of the suction duct, the air taken from the compressor 10 flows between the radially inner end of the flange 54 for fixing the upstream rectifier stage 24 and the upstream end of the frustoconical wall 68 of the screen plate. 62 (arrow F1). The reduced spacing between the flange 54 and the upstream end of the sheet 62 as well as the total closure of the holes 56 of the upstream shell 52 in the central portion of the sheet 62 limits the air intake to the right of the led 58, which avoids a drop in the static pressure in this place (curve B of the figure 2 ).

La flèche F2 indique le flux d'air provenant du compresseur 10 et traversant les trous 56 non obturés ou partiellement obturés de la virole 52 de l'étage redresseur amont 24 qui sont situés à proximité des extrémités circonférentielles 70 de la tôle 62.The arrow F2 indicates the flow of air coming from the compressor 10 and passing through the unsealed or partially closed holes 56 of the ferrule 52 of the upstream rectifier stage 24 which are located near the circumferential ends 70 of the plate 62.

Au-delà des extrémités circonférentielles 70 de la tôle 62, l'air prélevé dans le compresseur haute pression 10 circule entre la tôle 62 et le carter externe 14 pour ensuite être aspiré dans le conduit 58 (flèches F3).Beyond the circumferential ends 70 of the sheet 62, the air taken in the high pressure compressor 10 flows between the sheet 62 and the outer casing 14 and then sucked into the conduit 58 (arrows F3).

Ainsi le prélèvement d'air dans le compresseur haute pression 10 est réparti de manière uniforme sur 360° autour de l'axe 12 du compresseur 10. Comme représenté sur la courbe B de la figure 2, la pression statique varie faiblement autour d'une valeur moyenne en fonction de la position angulaire, ce qui permet de diminuer fortement les hétérogénéités de pression statique autour de l'axe 12 du compresseur 10.Thus the intake of air in the high-pressure compressor 10 is uniformly distributed over 360 ° about the axis 12 of the compressor 10. As shown in curve B of FIG. figure 2 the static pressure varies slightly around an average value as a function of the angular position, which makes it possible to greatly reduce the static pressure heterogeneities around the axis 12 of the compressor 10.

De plus, l'utilisation de cette tôle ne diminue pas la capacité de prélèvement d'air du conduit puisque les pressions statiques moyennes avec et sans tôle écran 62 sont sensiblement similaires et de l'ordre de 2,75 u.a.In addition, the use of this sheet does not reduce the air sampling capacity of the duct since the average static pressures with and without screen plate 62 are substantially similar and of the order of 2.75 u.a.

La tôle écran 62 peut être montée à son extrémité amont avec une précontrainte élastique en appui sur la bride du carter externe, ce qui permet de garantir un contact permanent de la tôle sur la bride. En fonctionnement, l'air aspiré dans le conduit 58 permet de plaquer davantage l'extrémité amont de la tôle sur la bride 54 du carter 14.The screen plate 62 may be mounted at its upstream end with an elastic preload bearing on the flange of the outer casing, which ensures a permanent contact of the sheet on the flange. In operation, the air sucked into the duct 58 makes it possible to further press the upstream end of the sheet on the flange 54 of the casing 14.

Un carter de compresseur comprend habituellement un ou plusieurs orifices permettant le passage d'un endoscope 75 d'exploration de l'intérieur du compresseur. A cette fin et comme représenté aux figures 5 et 6, la tôle 62 peut comprendre au moins un orifice 76 permettant le passage d'un tel endoscope.A compressor casing usually comprises one or more orifices allowing the passage of an endoscope 75 for exploration of the inside of the compressor. For this purpose and as represented Figures 5 and 6 , the sheet 62 may comprise at least one orifice 76 allowing the passage of such an endoscope.

La tôle écran s'étend sur au moins 180° et au plus sur 270° environ.The screen sheet extends over at least 180 ° and at most about 270 °.

Dans un exemple pratique de réalisation de l'invention, la tôle écran s'étend sur 234° et comprend un rebord cylindrique 70 s'étendant entre 0° et 36°, l'autre rebord s'étendant entre 180° et 234°. La dimension axiale de la tôle est de 36,3 mm à ses extrémités circonférentielles et de 30 mm en dehors. L'épaisseur de la tôle est de l'ordre de 1 mm.In a practical embodiment of the invention, the screen sheet extends over 234 ° and comprises a cylindrical flange 70 extending between 0 ° and 36 °, the other flange extending between 180 ° and 234 °. The axial dimension of the sheet is 36.3 mm at its circumferential ends and 30 mm outside. The thickness of the sheet is of the order of 1 mm.

La tôle 62 peut comprendre dans sa partie médiane et à son extrémité amont un rebord en saillie vers l'amont de dimension axiale inférieure aux rebords cylindriques des extrémités circonférentielles 70. Ce rebord a pour fonction de rigidifier la tôle et ainsi d'élever les fréquences de ses modes propres de vibration pour éviter tout phénomène de résonance de la tôle écran lorsque celle-ci est soumise à des vibrations lors du passage de l'air et du fonctionnement de la turbomachine. La dimension axiale de ce rebord peut être de 2 mm, par exemple.The sheet 62 may comprise in its median part and at its upstream end an upwardly projecting flange of smaller axial dimension than the cylindrical flanges of the circumferential ends 70. flange serves to stiffen the sheet and thus raise the frequencies of its own modes of vibration to avoid any phenomenon of resonance of the screen sheet when it is subjected to vibrations during the passage of air and operation of the turbomachine. The axial dimension of this rim may be 2 mm, for example.

L'intégration de la tôle écran 62 selon l'invention entre le carter externe 14 et la paroi 16 ne nécessite aucune modification structurelle du compresseur 10 puisque cette tôle vient en appui à une extrémité sur une bride 54 utilisée pour la fixation de la virole amont 52 et vient se fixer sur des brides 42, 44 de fixation de segments 36, 38. Cette tôle 62 peut ainsi être montée dans toutes les turbomachines lors de la fabrication ou lors d'une opération de maintenance.The integration of the screen plate 62 according to the invention between the outer casing 14 and the wall 16 does not require any structural modification of the compressor 10 since this sheet bears at one end on a flange 54 used for fixing the upstream shell. 52 and is fixed on flanges 42, 44 for securing segments 36, 38. This sheet 62 can thus be mounted in all turbomachines during manufacture or during a maintenance operation.

La figure 8 représente le montage de vis de fixation 78 dans les trous 72 de la tôle écran 62. La présence d'une paroi tronconique 68 à l'extrémité amont de la paroi cylindrique 62 permet d'introduire sans difficulté les vis 78 dans les trous de la bride 42.The figure 8 represents the mounting of fixing screws 78 in the holes 72 of the screen plate 62. The presence of a frustoconical wall 68 at the upstream end of the cylindrical wall 62 makes it possible to easily introduce the screws 78 into the holes of the flange 42.

Claims (14)

Compresseur (10) de turbomachine, tel qu'un compresseur haute pression, comprenant des moyens de prélèvement d'air comportant un conduit (58) dont l'extrémité d'aspiration débouche dans un carter externe (14) du compresseur (10) au niveau d'une roue mobile (18) et d'un étage redresseur (24) du compresseur (10), caractérisé en ce qu'une tôle écran (62) de forme annulaire est montée radialement à l'intérieur du carter (14) en regard d'une partie de l'extrémité d'aspiration du conduit (58) de manière à uniformiser le prélèvement d'air sur 360° autour de l'axe (12) du compresseur (10).A turbomachine compressor (10), such as a high pressure compressor, comprising air sampling means comprising a duct (58) whose suction end opens into an outer casing (14) of the compressor (10) at level of a moving wheel (18) and a rectifier stage (24) of the compressor (10), characterized in that a ring-shaped shield (62) is mounted radially inside the housing (14) facing a portion of the suction end of the duct (58) so as to standardize the air withdrawal 360 ° about the axis (12) of the compressor (10). Compresseur (10) selon la revendication 1, caractérisé en ce que la tôle écran (62) comprend à son extrémité amont des moyens d'appui radial sur une bride (54) du carter (14), l'extrémité aval (66) de la tôle étant fixée par des vis sur une bride annulaire de l'étage redresseur (26) monté en aval de la roue mobile (18).Compressor (10) according to claim 1, characterized in that the screen sheet (62) comprises at its upstream end radial support means on a flange (54) of the casing (14), the downstream end (66) of the sheet being fixed by screws on an annular flange of the rectifier stage (26) mounted downstream of the moving wheel (18). Compresseur (10) selon la revendication 2, caractérisé en ce que les moyens d'appui comprennent des rebords (70) de forme cylindrique s'étendant vers l'amont.Compressor (10) according to claim 2, characterized in that the support means comprise flanges (70) of cylindrical shape extending upstream. Compresseur (10) selon la revendication 3, caractérisé en ce que la tôle écran (62) s'étend sur moins de 360° et comporte un rebord cylindrique (70) à chacune de ses extrémités circonférentielles.Compressor (10) according to claim 3, characterized in that the screen sheet (62) extends over less than 360 ° and has a cylindrical rim (70) at each of its circumferential ends. Compresseur (10) selon la revendication 3 ou 4, caractérisé en ce que la tôle écran (62) s'étend sur 234° environ et ses rebords cylindriques (70) d'extrémité s'étendent angulairement sur plusieurs dizaines de degrés.Compressor (10) according to claim 3 or 4, characterized in that the screen sheet (62) extends over 234 ° and its cylindrical end rims (70) extend angularly over several tens of degrees. Compresseur (10) selon l'une des revendications 2 à 5, caractérisé en ce que l'extrémité aval (66) de la tôle écran (62) comprend des trous de grand diamètre (74) disposés en alternance avec des trous de petit diamètre (72) prévus pour le passage de vis de fixation.Compressor (10) according to one of claims 2 to 5, characterized in that the downstream end (66) of the screen plate (62) comprises large diameter holes (74) arranged alternately with small diameter holes (72) provided for the passage of fixing screws. Compresseur (10) selon l'une des revendications 2 à 6, caractérisé en ce que la tôle écran (62) est montée avec une précontrainte élastique en appui sur la bride (54) du carter (14).Compressor (10) according to one of claims 2 to 6, characterized in that the screen plate (62) is mounted with an elastic preload bearing on the flange (54) of the housing (14). Compresseur (10) selon l'une des revendications 2 à 7, caractérisé en ce qu'un étage redresseur (24) situé en amont de la roue mobile (18) est fixé à la bride (54) du carter (14) par une virole (52) qui comprend des trous de passages d'air (56) dont ceux situés au niveau d'une partie centrale de la tôle écran (62) sont totalement obturés.Compressor (10) according to one of claims 2 to 7, characterized in that a rectifier stage (24) situated upstream of the impeller (18) is fixed to the flange (54) of the casing (14) by a ferrule (52) which includes air passage holes (56) including those located at a central portion of the screen sheet (62) are completely closed. Compresseur (10) selon la revendication 8, caractérisé en ce que les trous de passage d'air (56) de la virole (52) situés en regard des parties d'extrémité de la tôle écran (62) sont obturés à 50 %.Compressor (10) according to claim 8, characterized in that the air passage holes (56) of the ferrule (52) located opposite the end portions of the screen plate (62) are closed at 50%. Compresseur (10) selon l'une des revendications précédentes, caractérisé en ce que la tôle écran (62) comprend au moins un orifice de passage (76) d'un endoscope (75).Compressor (10) according to one of the preceding claims, characterized in that the screen plate (62) comprises at least one passage opening (76) of an endoscope (75). Tôle écran (61) de forme annulaire destinée à être utilisée dans un compresseur selon l'une des revendications précédentes, caractérisée en ce que sa section est de forme en L.An annular screen panel (61) for use in a compressor according to one of the preceding claims, characterized in that its section is L-shaped. Tôle écran (62) selon la revendication 11, caractérisée en qu'elle comprend une paroi cylindrique (64) raccordée à une extrémité à une paroi radiale (66) comportant des trous de passage (72) de vis de fixation, l'autre extrémité étant raccordée à une paroi tronconique (68).Screen plate (62) according to claim 11, characterized in that it comprises a cylindrical wall (64) connected at one end to a radial wall (66) having through-holes (72) for fixing screws, the other end being connected to a frustoconical wall (68). Tôle écran selon la revendication 12, caractérisée en ce que sa paroi tronconique (68) comporte des rebords radiaux (70) orientés vers l'extérieur à ses extrémités circonférentielles.Screen plate according to claim 12, characterized in that its frustoconical wall (68) has radial flanges (70) facing outwards at its circumferential ends. Turbomachine, telle qu'un turboréacteur ou un turbopropulseur d'avion, caractérisée en ce qu'elle comprend un compresseur (10) selon l'une des revendications 1 à 10.Turbomachine, such as a turbojet engine or a turboprop engine, characterized in that it comprises a compressor (10) according to one of claims 1 to 10.
EP08168909.3A 2007-12-14 2008-11-12 Device for taking an air sample in a turbomachine compressor Active EP2071192B1 (en)

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JP2009144714A (en) 2009-07-02
RU2486374C2 (en) 2013-06-27
CA2646935C (en) 2016-05-03
JP5474344B2 (en) 2014-04-16
US20090155056A1 (en) 2009-06-18
RU2008149155A (en) 2010-06-20
US8152460B2 (en) 2012-04-10
FR2925130A1 (en) 2009-06-19
EP2071192B1 (en) 2018-01-03
CA2646935A1 (en) 2009-06-14
FR2925130B1 (en) 2012-07-27

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