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EP2526301B1 - Diffuser-rectifier connection for a centrifugal compressor - Google Patents

Diffuser-rectifier connection for a centrifugal compressor Download PDF

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Publication number
EP2526301B1
EP2526301B1 EP11704655.7A EP11704655A EP2526301B1 EP 2526301 B1 EP2526301 B1 EP 2526301B1 EP 11704655 A EP11704655 A EP 11704655A EP 2526301 B1 EP2526301 B1 EP 2526301B1
Authority
EP
European Patent Office
Prior art keywords
diffuser
assembly
flange
guide vane
disk
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP11704655.7A
Other languages
German (de)
French (fr)
Other versions
EP2526301A1 (en
Inventor
Jacques Marcel Arthur Bunel
Sandrine Gandelot
Guy Vieillefond
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
Safran Aircraft Engines SAS
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Publication date
Application filed by Safran Aircraft Engines SAS filed Critical Safran Aircraft Engines SAS
Publication of EP2526301A1 publication Critical patent/EP2526301A1/en
Application granted granted Critical
Publication of EP2526301B1 publication Critical patent/EP2526301B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/60—Mounting; Assembling; Disassembling
    • F04D29/62—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps
    • F04D29/624—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
    • F01D25/24—Casings; Casing parts, e.g. diaphragms, casing fastenings
    • F01D25/246—Fastening of diaphragms or stator-rings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D9/00—Stators
    • F01D9/02—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles
    • F01D9/04—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles forming ring or sector
    • 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
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/44—Fluid-guiding means, e.g. diffusers
    • F04D29/441—Fluid-guiding means, e.g. diffusers especially adapted for elastic fluid pumps
    • 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
    • F05D2250/50—Inlet or outlet
    • F05D2250/52—Outlet

Definitions

  • the field of the present invention is that of turbomachines and, in particular, that of the compressors of these turbomachines.
  • the aeronautical turbomachines are conventionally constituted by a set of assembled modules, comprising in the direction of air circulation, one or more compressors, a combustion chamber, one or more turbines which drive the compressor or compressors via drive shafts by drawing power on the gases leaving the combustion chamber, and at the outlet, a nozzle in which the exhaust gases are ejected to produce thrust, or a free turbine which recovers the energy of the gas to produce mechanical power.
  • the compressors are conventionally either of the axial type where the flow of air passing through them follows a substantially axial direction from the inlet to the outlet, or of the so-called centrifugal type where the air enters axially to come out in a radial direction.
  • a centrifugal compressor the air is collected at the outlet of the compression wheel by a radial part, called a diffuser, then transferred to a second part, called a rectifier, which brings back the flow of compressed air in a direction substantially axial, before its introduction into the combustion chamber.
  • One-piece rectifiers are also known which are fixed by bolting on flanges connected to the structure of the engine, but these configurations are characterized by additional pieces that induce a penalty in terms of mass. Moreover, these flanges can deform under the action of vibration or thermal expansion and do not ensure perfect continuity of the vein between the diffuser and the rectifier.
  • the present invention aims to overcome these disadvantages by providing a connection device between the diffuser and the rectifier that does not have at least some of the disadvantages of the prior art and, in particular, which is lightweight, simple to mount and to disassemble and which ensures a good alignment of the air circulation ducts at the outlet of the compressor.
  • the subject of the invention is an assembly consisting of a diffuser and a rectifier of the air flow at the outlet of a centrifugal compressor of a turbomachine, said diffuser having substantially the shape of a double disk. annular radially oriented, and said rectifier being a double O-piece, positioned in the extension of the double disk of the diffuser and curved to deflect the air flow downstream of the turbomachine, characterized in that said rectifier is fixed on said diffuser by a link positioned at immediate proximity of the contact surface of the two parts and dismountable using standard tools, excluding any other means of support.
  • a standard tooling must be understood as a tool transportable by the operator that is adapted to be implemented on the mounting station or disassembly of the turbomachine.
  • connection is a connection by screw and nut.
  • the diffuser comprises on one of its disks, at its contact surface with said rectifier, a flange parallel to said disk and delimiting with it a groove adapted to receive the head of said screw and having at least one notch adapted to let the rod of said screw.
  • the rectifier comprises, at its contact surface with said diffuser, a ring-shaped ring whose section comprises a first portion L, which envelops the end of the diffuser, followed by a second part having the form of a flange that comes to wrap the corresponding flange of the diffuser.
  • the rectifier at its surface intended to cooperate with the disk of the diffuser opposite to the disk carrying said flange, comprises a ring-shaped ring with L. section.
  • the diffuser comprises, on its disc opposite the one carrying said flange, an L-shaped flange, which extends axially towards the outside of the diffuser and projects radially so as to form a flange. cross stop for the rectifier.
  • the screw comprises on its head a truncated portion so as to constitute an anti-rotation member by cooperation with the bottom of the groove.
  • the invention also relates to a compressor module for a turbomachine, comprising a diffuser-rectifier assembly as described above and, finally, a turbomachine comprising such a diffuser-rectifier assembly positioned at the outlet of a centrifugal compressor.
  • the diffuser 1 placed at the outlet of the mobile wheel of a centrifugal compressor, not shown, and a rectifier 2 which causes the flow of compressed air a deflection of about 120 ° to send it towards a combustion chamber, not shown also.
  • the diffuser 1 is substantially in the form of a radially oriented double annular disk in the center of which the compressor wheel is inserted and which forms a conduit for collecting the compressed air.
  • the rectifier 2 is a two-sided O-piece, positioned in the extension of the double disk of the diffuser and which is bent to deflect the flow of air towards the downstream of the engine (the downstream being represented to the right on the figure 1 ).
  • the downstream disk 3 of the diffuser comprises, positioned outside the diffuser, a flange 4 parallel to the downstream disk 3 and running over its entire circumference, which is connected to the downstream disk by a bridge so as to create a groove 5 between the flange 4 and the downstream disk 3.
  • the flange 4 is positioned against the disc located downstream, that is to say the disc accessible last during assembly in the presented configuration; it is obvious that this type of connection may include a flange 4 mounted on the upstream disk, if it is the latter which is accessible last during the assembly of the engine.
  • the disk of the diffuser 1 terminates in an L-shaped flange 6, which extends first axially towards the outside of the diffuser so as not to disturb the flow of the air flow at the interior of said diffuser and which then projects radially so as to constitute a transverse stop flange for the rectifier.
  • L-shaped flange 6 extends first axially towards the outside of the diffuser so as not to disturb the flow of the air flow at the interior of said diffuser and which then projects radially so as to constitute a transverse stop flange for the rectifier.
  • the rectifier 2 terminates at its junction with the diffuser 1, on the upstream side, by an upstream ring 7 of L-shaped section whose axial extension cooperates with the flange L 6 of the diffuser and, on the downstream side by a downstream ferrule 8 also of toric form.
  • the section of the downstream ferrule 8 comprises a first portion 8a, L, which envelops the end of the diffuser, and continues with a second portion 8b in the form of a flange which caps the corresponding flange 4 of the diffuser 1.
  • Maintaining the rectifier 2 on the diffuser 1 is provided by a screw 9 whose head is placed in the groove 5 and which extends perpendicularly to the wall of the downstream disc 3.
  • This screw passes through, on the one hand, the flange 4 of the diffuser at a notch 11 formed in said flange and secondly the second portion 8b of the downstream ferrule 8 at a bore 12.
  • the assembly is tightened by means of a nut 10 which cooperates with the screw 9 and which is based on the second part 8b.
  • FIGS. 3 and 4 show the screw 9 whose head is truncated to reveal a flat portion 13 and the notch 11 formed in the wall of the flange 4 of the diffuser.
  • the Figures 5 to 7 show the sequence of operations for mounting a rectifier 2 on a diffuser 1.
  • the head of the screw 9 is positioned in the groove 5 of the diffuser 1, with its flat 13 against the bottom of the groove to provide an anti-rotation function during clamping.
  • the rod of the screw 9 is positioned perpendicular to the flange 4 and passes through the notch 11 formed in this flange.
  • the rectifier 2 has been installed on the diffuser 1, by an axial translation movement.
  • the downstream ferrule 8 is here represented in transparency.
  • the first part 8a of the shell extends in the background, in the extension of the downstream disc 3, while the second part 8b covers the flange 4 of the diffuser.
  • the rod of the screw 9 passes through the second portion 8b by the bore 12 made for this purpose.
  • the figure 7 shows the assembled diffuser-rectifier assembly.
  • the nut 10 is screwed onto the rod of the screw 9 and secures the ferrule 8 of the rectifier with the flange 4 of the diffuser.
  • the diffuser 1 is preferably made from a piece cut in the mass, the groove 5 being machined in an extra thickness left on the downstream disc 3.
  • the groove being machined, notches are then performed in the flange 4 of the diffuser, being distributed a priori regularly on the circumference of said flange.
  • the rectifier 2 is, for its part, made by an attached sheet which reconstructs the air stream, on which is reported by welding or brazing the upstream and downstream ferrules 7 8 which provide the connection with the diffuser 1.
  • This method of realization allows to realize the rectifier independently of the other parts of the turbomachine and in particular to resume the weld seam ferrules in case of overflow of the cord, before mounting the rectifier 2 on the diffuser 1. It can thus s ensure that no burrs from welding protrude into the airstream and disturbs flow by causing pressure drops or unwanted turbulence.
  • the first improvement provided by the invention lies in a perfect alignment of the two parts, which remain aligned regardless of the operating conditions and, in particular, regardless of the level of vibration or thermal deformation of the parts. This characteristic results from the fitting of the ferrule 8 of the rectifier between one side the radial extension of the flange L 6 and the other side flange 4 of the diffuser.
  • the tightening of the screw 9 further provides a stressing of this shell which is retained by the L-shaped flange and which is pushed against the flange 4 by the nut 10. This stressing ensures a good holding of the shell 8 and the perfect alignment of the ducts that channel the vein of air.
  • the rectifier 2 is mounted directly on the diffuser 1, without connection by flanges with the engine structure, which avoids the deformations due to the flexibility of these holding flanges, as found in the prior art.
  • the positioning of the clamping means of the rectifier 2 as close as possible to its connection with the diffuser 1 contributes to this improvement in the rigidity of the assembly and to the constant alignment of the conduits. This avoids the multiplicity of devices for maintaining the rectifier and the mass associated therewith.

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

Description

Le domaine de la présente invention est celui des turbomachines et, en particulier, celui des compresseurs de ces turbomachines.The field of the present invention is that of turbomachines and, in particular, that of the compressors of these turbomachines.

Les turbomachines aéronautiques sont classiquement constituées par un ensemble de modules assemblés, comportant dans le sens de circulation de l'air, un ou plusieurs compresseurs, une chambre de combustion, une ou plusieurs turbines qui entraînent le ou les compresseurs par l'intermédiaire d'arbres d'entraînement en prélevant de la puissance sur les gaz en sortie de la chambre de combustion, et en sortie, soit une tuyère dans laquelle sont éjectés les gaz brûlés pour produire de la poussée, soit une turbine libre qui récupère l'énergie des gaz pour produire de la puissance mécanique.The aeronautical turbomachines are conventionally constituted by a set of assembled modules, comprising in the direction of air circulation, one or more compressors, a combustion chamber, one or more turbines which drive the compressor or compressors via drive shafts by drawing power on the gases leaving the combustion chamber, and at the outlet, a nozzle in which the exhaust gases are ejected to produce thrust, or a free turbine which recovers the energy of the gas to produce mechanical power.

Les compresseurs sont classiquement, soit du type axial où le flux d'air qui les traverse suit une direction sensiblement axiale de l'entrée jusqu'à la sortie, soit du type dit centrifuge où l'air y entre axialement pour en ressortir dans une direction radiale. Dans le cas d'un compresseur centrifuge l'air est collecté en sortie de la roue de compression par une pièce radiale, appelée diffuseur, puis transférée dans une seconde pièce, appelée redresseur, qui ramène le flux d'air comprimé dans une direction sensiblement axiale, avant son introduction dans la chambre de combustion.The compressors are conventionally either of the axial type where the flow of air passing through them follows a substantially axial direction from the inlet to the outlet, or of the so-called centrifugal type where the air enters axially to come out in a radial direction. In the case of a centrifugal compressor, the air is collected at the outlet of the compression wheel by a radial part, called a diffuser, then transferred to a second part, called a rectifier, which brings back the flow of compressed air in a direction substantially axial, before its introduction into the combustion chamber.

Plusieurs configurations ont été proposées pour ces pièces sur les turbomachines aéronautiques existantes. On connait des machines où le redresseur est constitué par une pièce qui est utilisée en combinaison avec le carter externe du compresseur pour former un conduit de guidage du flux. Ce type de redresseur présente l'inconvénient d'une liaison imparfaite entre le diffuseur et le redresseur et une mauvaise qualité de l'étanchéité au niveau du redresseur. On connait par exemple la demande WO 01/18404 A1 ou la demande de brevet WO 01/29424 de la société Pratt & Whitney Canada où le redresseur est boulonné à son extrémité amont sur le diffuseur et soudé au carter de chambre par son extrémité aval.Several configurations have been proposed for these parts on existing aerospace turbomachines. Machines are known where the rectifier is constituted by a part which is used in combination with the outer casing of the compressor to form a guide duct of the flow. This type of rectifier has the disadvantage of an imperfect connection between the diffuser and the rectifier and poor quality of the seal at the level of the rectifier. We know, for example, the demand WO 01/18404 A1 or the patent application WO 01/29424 from Pratt & Whitney Canada where the straightener is bolted at its upstream end to the diffuser and welded to the chamber housing at its downstream end.

On connaît également des redresseurs monoblocs qui sont fixés par boulonnage sur des brides reliées à la structure du moteur, mais ces configurations se caractérisent par des pièces supplémentaires qui induisent une pénalité en termes de masse. Par ailleurs ces brides peuvent se déformer sous l'action des vibrations ou des dilatations thermiques et ne pas assurer une continuité parfaite de la veine entre le diffuseur et le redresseur.One-piece rectifiers are also known which are fixed by bolting on flanges connected to the structure of the engine, but these configurations are characterized by additional pieces that induce a penalty in terms of mass. Moreover, these flanges can deform under the action of vibration or thermal expansion and do not ensure perfect continuity of the vein between the diffuser and the rectifier.

On connaît des redresseurs monoblocs montés directement sur le diffuseur par une liaison du type frettage qui associe les deux pièces de façon rigide, comme décrit dans le document WO-01/29424-A1 . Le frettage est l'assemblage de deux pièces grâce à un ajustement serré. L'assemblage est réalisé avec des tolérances d'usinage qui interdisent son montage à la main, ou même à la presse, et il nécessite généralement des moyens pour chauffer ou pour refroidir les pièces à assembler. Si cette solution apporte un gain en termes de masse et de continuité de la veine, elle est difficilement démontable sans moyens adaptés et ne peut pas être réalisée par un opérateur équipé de son seul outillage traditionnel.There are known monobloc rectifiers mounted directly on the diffuser by a hoop-type connection which combines the two parts rigidly, as described in document WO-01/29424-A1 . The hooping is the assembly of two pieces thanks to a tight fit. The assembly is made with machining tolerances that prohibit its assembly by hand, or even the press, and it generally requires means for heating or for cooling the parts to be assembled. If this solution brings a gain in terms of mass and continuity of the vein, it is difficult to dismount without suitable means and can not be performed by an operator equipped with its only traditional tooling.

On connaît enfin des diffuseurs formés en partie d'une pièce avec un carter du compresseur et pour partie d'une pièce annulaire définissant par ailleurs un redresseur avec un logement de compresseur de la turbomachine. Un tel montage tripartite est décrit dans le document US 2007/0036646-A1 . Un tel montage est particulièrement complexe.Finally, there are known diffusers formed partly of a part with a compressor casing and partly of an annular part defining moreover a rectifier with a compressor housing of the turbomachine. Such a tripartite arrangement is described in the document US 2007/0036646-A1 . Such an arrangement is particularly complex.

La présente invention a pour but de remédier à ces inconvénients en proposant un dispositif de liaison entre le diffuseur et le redresseur qui ne présente pas au moins certains des inconvénients de l'art antérieur et, en particulier, qui soit léger, simple à monter et à démonter et qui garantisse un bon alignement des conduits de circulation de l'air en sortie du compresseur.The present invention aims to overcome these disadvantages by providing a connection device between the diffuser and the rectifier that does not have at least some of the disadvantages of the prior art and, in particular, which is lightweight, simple to mount and to disassemble and which ensures a good alignment of the air circulation ducts at the outlet of the compressor.

A cet effet, l'invention a pour objet un ensemble constitué d'un diffuseur et d'un redresseur du flux d'air en sortie d'un compresseur centrifuge d'une turbomachine, ledit diffuseur ayant sensiblement la forme d'un double disque annulaire orienté radialement, et ledit redresseur étant une pièce torique double, positionnée dans le prolongement du double disque du diffuseur et courbée pour dévier le flux d'air vers l'aval de la turbomachine, caractérisé en ce que ledit redresseur est fixé sur ledit diffuseur par une liaison positionnée à
proximité immédiate de la surface de contact des deux pièces et démontable à l'aide d'un outillage standard, à l'exclusion de tout autre moyen de support.For this purpose, the subject of the invention is an assembly consisting of a diffuser and a rectifier of the air flow at the outlet of a centrifugal compressor of a turbomachine, said diffuser having substantially the shape of a double disk. annular radially oriented, and said rectifier being a double O-piece, positioned in the extension of the double disk of the diffuser and curved to deflect the air flow downstream of the turbomachine, characterized in that said rectifier is fixed on said diffuser by a link positioned at
immediate proximity of the contact surface of the two parts and dismountable using standard tools, excluding any other means of support.

Une telle liaison élimine les risques de désalignement des deux pièces, tout en restant facilement démontable, sans que l'opérateur ait besoin d'avoir recours à des moyens autres que ceux dont il dispose couramment. Un outillage standard doit être compris comme un outillage transportable par l'opérateur qui est apte à être mis en oeuvre sur le poste de montage ou de démontage de la turbomachine.Such a connection eliminates the risk of misalignment of the two parts, while remaining easily removable, without the operator needing to resort to means other than those available to him fluently. A standard tooling must be understood as a tool transportable by the operator that is adapted to be implemented on the mounting station or disassembly of the turbomachine.

Avantageusement la liaison est une liaison par vis et écrou.Advantageously, the connection is a connection by screw and nut.

De façon préférentielle le diffuseur comporte sur un de ses disques, au niveau de sa surface de contact avec ledit redresseur, une bride parallèle audit disque et délimitant avec lui une gorge apte à recevoir la tête de ladite vis et comportant au moins une encoche apte à laisser passer la tige de ladite vis.Preferably the diffuser comprises on one of its disks, at its contact surface with said rectifier, a flange parallel to said disk and delimiting with it a groove adapted to receive the head of said screw and having at least one notch adapted to let the rod of said screw.

Dans un mode particulier de réalisation le redresseur comporte, au niveau de sa surface de contact avec ledit diffuseur, une virole de forme torique dont la section comporte une première partie en L, qui enveloppe l'extrémité du diffuseur, suivie d'une seconde partie ayant la forme d'une bride qui vient envelopper la bride correspondante du diffuseur.In a particular embodiment, the rectifier comprises, at its contact surface with said diffuser, a ring-shaped ring whose section comprises a first portion L, which envelops the end of the diffuser, followed by a second part having the form of a flange that comes to wrap the corresponding flange of the diffuser.

Avantageusement le redresseur, au niveau de sa surface destinée à coopérer avec le disque du diffuseur opposé au disque portant ladite bride, comporte une virole de forme torique à section à L.Advantageously, the rectifier, at its surface intended to cooperate with the disk of the diffuser opposite to the disk carrying said flange, comprises a ring-shaped ring with L. section.

Dans un autre mode particulier de réalisation le diffuseur comporte, sur son disque opposé à celui portant ladite bride, une bride en forme de L, qui s'étend axialement vers l'extérieur du diffuseur et qui se projette radialement de façon à constituer une bride d'arrêt transversal pour le redresseur.In another particular embodiment, the diffuser comprises, on its disc opposite the one carrying said flange, an L-shaped flange, which extends axially towards the outside of the diffuser and projects radially so as to form a flange. cross stop for the rectifier.

Préférentiellement la vis comporte sur sa tête une partie tronquée de façon à constituer un organe anti-rotation par coopération avec le fond de la gorge.Preferably the screw comprises on its head a truncated portion so as to constitute an anti-rotation member by cooperation with the bottom of the groove.

L'invention porte également sur un module de compresseur pour une turbomachine, comportant un ensemble diffuseur-redresseur tel que décrit ci-dessus et, enfin, sur une turbomachine comportant un tel ensemble diffuseur-redresseur positionné en sortie d'un compresseur centrifuge.The invention also relates to a compressor module for a turbomachine, comprising a diffuser-rectifier assembly as described above and, finally, a turbomachine comprising such a diffuser-rectifier assembly positioned at the outlet of a centrifugal compressor.

L'invention sera mieux comprise, et d'autres buts, détails, caractéristiques et avantages de celle-ci apparaîtront plus clairement au cours de la description explicative détaillée qui va suivre, d'un mode de réalisation de l'invention donné à titre d'exemple purement illustratif et non limitatif, en référence aux dessins schématiques annexés.The invention will be better understood, and other objects, details, features and advantages thereof will become more clearly apparent in the following detailed explanatory description of a embodiment of the invention given by way of purely illustrative and non-limiting example, with reference to the accompanying schematic drawings.

Sur ces dessins :

  • la figure 1 est une vue en coupe d'un ensemble diffuseur-redresseur pour un compresseur centrifuge, selon un mode de réalisation de l'invention ;
  • la figure 2 est une vue en coupe de la liaison diffuseur-redresseur selon un mode de réalisation de l'invention ;
  • la figure 3 est une vue en perspective d'une vis d'assemblage de la liaison diffuseur-redresseur selon un mode de réalisation de l'invention ;
  • la figure 4 est une vue en perspective d'une encoche dans la bride du diffuseur pour la réalisation d'une liaison selon un mode de réalisation de l'invention ;
  • la figure 5 est une vue en perspective d'une vis d'assemblage en place dans la gorge d'un diffuseur pour une liaison selon un mode de réalisation de l'invention ;
  • la figure 6 est une vue en perspective d'une liaison diffuseur-redresseur selon un mode de réalisation de l'invention, avant la mise en place de l'écrou de serrage ;
  • la figure 7 est une vue en perspective d'une liaison diffuseur-redresseur selon un mode de réalisation de l'invention, après la mise en place de l'écrou de serrage.
On these drawings:
  • the figure 1 is a sectional view of a diffuser-rectifier assembly for a centrifugal compressor, according to an embodiment of the invention;
  • the figure 2 is a sectional view of the diffuser-rectifier connection according to one embodiment of the invention;
  • the figure 3 is a perspective view of an assembly screw of the diffuser-rectifier connection according to one embodiment of the invention;
  • the figure 4 is a perspective view of a notch in the diffuser flange for making a connection according to an embodiment of the invention;
  • the figure 5 is a perspective view of an assembly screw in place in the groove of a diffuser for a connection according to an embodiment of the invention;
  • the figure 6 is a perspective view of a diffuser-rectifier connection according to an embodiment of the invention, before the establishment of the clamping nut;
  • the figure 7 is a perspective view of a diffuser-rectifier connection according to one embodiment of the invention, after the establishment of the clamping nut.

En se référant à la figure 1, on voit un diffuseur 1 placé en sortie de la roue mobile d'un compresseur centrifuge, non représenté, et un redresseur 2 qui fait subir au flux d'air comprimé une déviation d'environ 120° pour l'envoyer en direction d'une chambre de combustion, non représentée également. Le diffuseur 1 a sensiblement la forme d'un double disque annulaire, orienté radialement, dans le centre duquel s'insère la roue de compresseur et qui forme un conduit de collecte de l'air comprimé. Le redresseur 2 est une pièce torique à deux faces, positionnée dans le prolongement du double disque du diffuseur et qui est courbée pour dévier le flux d'air vers l'aval du moteur (l'aval étant représenté à droite sur la figure 1).Referring to the figure 1 , we see a diffuser 1 placed at the outlet of the mobile wheel of a centrifugal compressor, not shown, and a rectifier 2 which causes the flow of compressed air a deflection of about 120 ° to send it towards a combustion chamber, not shown also. The diffuser 1 is substantially in the form of a radially oriented double annular disk in the center of which the compressor wheel is inserted and which forms a conduit for collecting the compressed air. The rectifier 2 is a two-sided O-piece, positioned in the extension of the double disk of the diffuser and which is bent to deflect the flow of air towards the downstream of the engine (the downstream being represented to the right on the figure 1 ).

En se référant à la figure 2 on voit le détail de la liaison entre le diffuseur 1 et le redresseur 2. Le disque aval 3 du diffuseur comporte, positionnée à l'extérieur du diffuseur, une bride 4 parallèle au disque aval 3 et courant sur toute sa circonférence, qui est reliée au disque aval par un pont de façon à créer une gorge 5 entre la bride 4 et le disque aval 3. Sur les figures 1 et 2, la bride 4 est positionnée contre le disque situé en aval, c'est à dire au disque accessible en dernier lors du montage dans la configuration présentée ; il est bien évident que ce type de liaison peut comporter une bride 4 montée sur le disque amont, si c'est celui-ci qui est accessible en dernier lors de l'assemblage du moteur.Referring to the figure 2 we see the detail of the connection between the diffuser 1 and the rectifier 2. The downstream disk 3 of the diffuser comprises, positioned outside the diffuser, a flange 4 parallel to the downstream disk 3 and running over its entire circumference, which is connected to the downstream disk by a bridge so as to create a groove 5 between the flange 4 and the downstream disk 3. On the Figures 1 and 2 , the flange 4 is positioned against the disc located downstream, that is to say the disc accessible last during assembly in the presented configuration; it is obvious that this type of connection may include a flange 4 mounted on the upstream disk, if it is the latter which is accessible last during the assembly of the engine.

Du côté amont le disque du diffuseur 1 se termine par une bride 6 en forme de L, qui s'étend tout d'abord axialement vers l'extérieur du diffuseur afin de ne pas perturber pas la circulation du flux d'air à l'intérieur dudit diffuseur puis qui se projette ensuite radialement de façon à constituer une bride d'arrêt transversal pour le redresseur. Il convient de noter que, dans l'ensemble du présent document, le terme axial est utilisé en référence à l'axe de rotation des éléments tournants de la turbomachine et au sens de circulation du flux gazeux.On the upstream side the disk of the diffuser 1 terminates in an L-shaped flange 6, which extends first axially towards the outside of the diffuser so as not to disturb the flow of the air flow at the interior of said diffuser and which then projects radially so as to constitute a transverse stop flange for the rectifier. It should be noted that, throughout the present document, the term axial is used with reference to the axis of rotation of the rotating elements of the turbomachine and the direction of flow of the gas stream.

Le redresseur 2 se termine au niveau de sa jonction avec le diffuseur 1, du côté amont, par une virole amont 7 de forme torique à section à L dont l'extension axiale coopère avec la bride en L 6 du diffuseur et, du côté aval, par une virole aval 8 de forme également torique. La section de la virole aval 8 comporte une première partie 8a, en L, qui enveloppe l'extrémité du diffuseur, et se poursuit par une seconde partie 8b ayant la forme d'une bride qui vient coiffer la bride 4 correspondante du diffuseur 1.The rectifier 2 terminates at its junction with the diffuser 1, on the upstream side, by an upstream ring 7 of L-shaped section whose axial extension cooperates with the flange L 6 of the diffuser and, on the downstream side by a downstream ferrule 8 also of toric form. The section of the downstream ferrule 8 comprises a first portion 8a, L, which envelops the end of the diffuser, and continues with a second portion 8b in the form of a flange which caps the corresponding flange 4 of the diffuser 1.

Le maintien du redresseur 2 sur le diffuseur 1 est assuré par une vis 9 dont la tête est placée dans la gorge 5 et qui s'étend perpendiculairement à la paroi du disque aval 3. Cette vis traverse, d'une part, la bride 4 du diffuseur au niveau d'une encoche 11 pratiquée dans ladite bride et, d'autre part, la seconde partie 8b de la virole aval 8 au niveau d'un perçage 12. L'ensemble est serré par l'intermédiaire d'un écrou 10 qui coopère avec la vis 9 et qui s'appuie sur la seconde partie 8b.Maintaining the rectifier 2 on the diffuser 1 is provided by a screw 9 whose head is placed in the groove 5 and which extends perpendicularly to the wall of the downstream disc 3. This screw passes through, on the one hand, the flange 4 of the diffuser at a notch 11 formed in said flange and secondly the second portion 8b of the downstream ferrule 8 at a bore 12. The assembly is tightened by means of a nut 10 which cooperates with the screw 9 and which is based on the second part 8b.

Les figures 3 et 4 montrent la vis 9 dont la tête est tronquée pour faire apparaître un méplat 13 et l'encoche 11 pratiquée dans la paroi de la bride 4 du diffuseur.The Figures 3 and 4 show the screw 9 whose head is truncated to reveal a flat portion 13 and the notch 11 formed in the wall of the flange 4 of the diffuser.

Les figures 5 à 7 montrent l'enchaînement des opérations pour le montage d'un redresseur 2 sur un diffuseur 1.The Figures 5 to 7 show the sequence of operations for mounting a rectifier 2 on a diffuser 1.

Sur la figure 5 la tête de la vis 9 est positionnée dans la gorge 5 du diffuseur 1, avec son méplat 13 contre le fond de la gorge pour assurer une fonction d'anti-rotation lors du serrage. La tige de la vis 9 est positionnée perpendiculairement à la bride 4 et traverse l'encoche 11 pratiquée dans cette bride.On the figure 5 the head of the screw 9 is positioned in the groove 5 of the diffuser 1, with its flat 13 against the bottom of the groove to provide an anti-rotation function during clamping. The rod of the screw 9 is positioned perpendicular to the flange 4 and passes through the notch 11 formed in this flange.

Sur la figure 6 le redresseur 2 a été installé sur le diffuseur 1, par un mouvement de translation axiale. Pour des raisons de lisibilité des figures 6 et 7, la virole aval 8 est ici représentée en transparence. La première partie 8a de la virole s'étend en arrière plan, dans le prolongement du disque aval 3, tandis que la seconde partie 8b recouvre la bride 4 du diffuseur. La tige de la vis 9 passe au travers de la seconde partie 8b par le perçage 12 pratiqué à cet effet.On the figure 6 the rectifier 2 has been installed on the diffuser 1, by an axial translation movement. For reasons of readability of Figures 6 and 7 , the downstream ferrule 8 is here represented in transparency. The first part 8a of the shell extends in the background, in the extension of the downstream disc 3, while the second part 8b covers the flange 4 of the diffuser. The rod of the screw 9 passes through the second portion 8b by the bore 12 made for this purpose.

La figure 7 montre l'ensemble diffuseur- redresseur assemblé. L'écrou 10 est vissé sur la tige de la vis 9 et solidarise la virole 8 du redresseur avec la bride 4 du diffuseur.The figure 7 shows the assembled diffuser-rectifier assembly. The nut 10 is screwed onto the rod of the screw 9 and secures the ferrule 8 of the rectifier with the flange 4 of the diffuser.

On va maintenant décrire les améliorations apportées dans le fonctionnement et dans l'utilisation d'un ensemble diffuseur-redresseur reliés par une liaison selon l'invention, par comparaison avec les configurations connues de l'art antérieur.We will now describe the improvements in the operation and in the use of a diffuser-rectifier assembly connected by a connection according to the invention, in comparison with known configurations of the prior art.

Sur le plan de la réalisation des deux pièces, le diffuseur 1 est préférentiellement réalisé à partir d'une pièce taillée dans la masse, la gorge 5 étant usinée dans une surépaisseur laissée sur le disque aval 3. La gorge étant usinée, des encoches sont ensuite pratiquées dans la bride 4 du diffuseur, en étant réparties a priori de façon régulière sur la circonférence de ladite bride.In terms of the production of the two parts, the diffuser 1 is preferably made from a piece cut in the mass, the groove 5 being machined in an extra thickness left on the downstream disc 3. The groove being machined, notches are then performed in the flange 4 of the diffuser, being distributed a priori regularly on the circumference of said flange.

Le redresseur 2 est, quant à lui, réalisé par une tôle rapportée qui reconstitue la veine d'air, sur laquelle est rapportée par soudage ou brasage les viroles amont 7 et aval 8 qui assurent la liaison avec le diffuseur 1. Cette méthode de réalisation permet de réaliser le redresseur d'une façon indépendante des autres pièces de la turbomachine et notamment de pouvoir reprendre le cordon de soudure des viroles en cas de débordement de ce cordon, avant le montage du redresseur 2 sur le diffuseur 1. On peut ainsi s'assurer qu'aucune bavure provenant du soudage ne fait saillie dans la veine d'air et ne vient perturber l'écoulement en provoquant des pertes de charge ou des turbulences non désirées.The rectifier 2 is, for its part, made by an attached sheet which reconstructs the air stream, on which is reported by welding or brazing the upstream and downstream ferrules 7 8 which provide the connection with the diffuser 1. This method of realization allows to realize the rectifier independently of the other parts of the turbomachine and in particular to resume the weld seam ferrules in case of overflow of the cord, before mounting the rectifier 2 on the diffuser 1. It can thus s ensure that no burrs from welding protrude into the airstream and disturbs flow by causing pressure drops or unwanted turbulence.

La première amélioration apportée par l'invention réside dans un alignement parfait des deux pièces, qui restent alignées quelles que soient les conditions de fonctionnement et, en particulier, quel que soit le niveau des vibrations ou des déformations thermiques des pièces. Cette caractéristique résulte de l'emmanchement de la virole 8 du redresseur entre d'un côté l'extension radiale de la bride en L 6 et de l'autre côté la bride 4 du diffuseur. Le serrage de la vis 9 procure en outre une mise sous contrainte de cette virole qui est retenue par la bride en L et qui est poussée contre la bride 4 par l'écrou 10. Cette mise sous contrainte garantit une bonne tenue de la virole 8 et le parfait alignement des conduits qui canalisent la veine d'air.The first improvement provided by the invention lies in a perfect alignment of the two parts, which remain aligned regardless of the operating conditions and, in particular, regardless of the level of vibration or thermal deformation of the parts. This characteristic results from the fitting of the ferrule 8 of the rectifier between one side the radial extension of the flange L 6 and the other side flange 4 of the diffuser. The tightening of the screw 9 further provides a stressing of this shell which is retained by the L-shaped flange and which is pushed against the flange 4 by the nut 10. This stressing ensures a good holding of the shell 8 and the perfect alignment of the ducts that channel the vein of air.

Par ailleurs le redresseur 2 est monté directement sur le diffuseur 1, sans liaison par des brides avec la structure du moteur, ce qui évite les déformations dues à la flexibilité de ces brides de maintien, comme on en rencontre dans l'art antérieur. De même le positionnement du moyen de serrage du redresseur 2 au plus près de sa liaison avec le diffuseur 1 participe à cette amélioration de la rigidité du montage et à la constance de l'alignement des conduits. On évite ainsi la multiplicité de dispositifs de maintien du redresseur et la masse qui y serait associée.Furthermore the rectifier 2 is mounted directly on the diffuser 1, without connection by flanges with the engine structure, which avoids the deformations due to the flexibility of these holding flanges, as found in the prior art. Similarly, the positioning of the clamping means of the rectifier 2 as close as possible to its connection with the diffuser 1 contributes to this improvement in the rigidity of the assembly and to the constant alignment of the conduits. This avoids the multiplicity of devices for maintaining the rectifier and the mass associated therewith.

Enfin le principe d'assemblage par boulonnage garantit la possibilité d'un démontage aisé et facilite, en conséquence, le remplacement des différents éléments qui pourraient être endommagés au cours de la vie de la pièce.Finally the principle of assembly by bolting ensures the possibility of easy disassembly and facilitates, therefore, the replacement of the various elements that could be damaged during the life of the room.

Bien que l'invention ait été décrite en relation avec un mode de réalisation particulier, il est bien évident qu'elle comprend tous les équivalents techniques des moyens décrits ainsi que leurs combinaisons si celles-ci entrent dans le cadre de l'invention.Although the invention has been described in connection with a particular embodiment, it is obvious that it includes all the technical equivalents of the means described and their combinations if they fall within the scope of the invention.

Claims (9)

  1. An assembly comprising a diffuser (1) and a guide vane (2) of a an airflow at the outlet from a centrifugal compressor of a turbine engine, said diffuser having approximately the form of a double annular disk oriented radially and said guide vane being a double toroidal part positioned in the extension of the double diffuser disk and curved to divert the air flow towards the downstream side of the turbomachine, characterized in that said guide vane is fixed to said diffuser by a connection which is positioned immediately next to the contact surface of the two parts and which can be released using standard tooling, with the exclusion of any other means of support.
  2. The assembly as claimed in claim 1, wherein the connection is a connection by bolt (9) and nut (10) .
  3. The assembly as claimed in claim 2, wherein the diffuser (1) comprises on one of its disks (3), at its contact surface with said guide vane, a flange (4) parallel to said disk and delimiting with said disk a groove (5) able to receive the head of said bolt (9) and comprising at least one notch (11) to allow passage of the stem of said bolt.
  4. The assembly as claimed in claim 3, wherein the guide vane (2), at its contact surface with said diffuser, comprises a toroidal ferrule (8), a section of which comprises a first L-shaped part (8a) which surrounds the end of the diffuser (1) followed by a second part (8b) having the form of a flange which surrounds the corresponding flange (4) of the diffuser.
  5. The assembly as claimed in either of claims 3 and 4, wherein the guide vane (2), at its surface intended to cooperate with the diffuser disk opposite the disk (3) carrying said flange (4), comprises a toroidal ferrule (7) with L-shaped section.
  6. The assembly as claimed in any of claims 3 to 5, wherein the diffuser (1), on its disk opposite that carrying said flange (4), comprises an L-shaped flange (6) which extends axially towards the outside of the diffuser and which projects radially so as to constitute a transverse stop flange for the guide vane.
  7. The assembly as claimed in any of claims 3 to 6, wherein the bolt (9) on its head comprises a truncated part to constitute an anti-rotation element by cooperation with the base of the groove (5) .
  8. A compressor module for a turbine engine comprising a diffuser-guide vane assembly as claimed in any of claims 1 to 7.
  9. A turbine engine comprising a diffuser-guide vane assembly as claimed in any of claims 1 to 7 at the outlet from a centrifugal compressor.
EP11704655.7A 2010-01-19 2011-01-19 Diffuser-rectifier connection for a centrifugal compressor Active EP2526301B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1050328A FR2955364B1 (en) 2010-01-19 2010-01-19 DIFFUSER-RECTIFIER CONNECTION FOR A CENTRIFUGAL COMPRESSOR
PCT/FR2011/050092 WO2011089355A1 (en) 2010-01-19 2011-01-19 Diffuser-rectifier connection for a centrifugal compressor

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EP2526301A1 EP2526301A1 (en) 2012-11-28
EP2526301B1 true EP2526301B1 (en) 2019-03-06

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EP (1) EP2526301B1 (en)
JP (1) JP5755250B2 (en)
CN (1) CN102713308B (en)
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CA (1) CA2787480C (en)
FR (1) FR2955364B1 (en)
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WO (1) WO2011089355A1 (en)

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RU2012135461A (en) 2014-02-27
BR112012017995B1 (en) 2022-08-30
JP2013517426A (en) 2013-05-16
CN102713308A (en) 2012-10-03
EP2526301A1 (en) 2012-11-28
CA2787480C (en) 2017-11-21
CN102713308B (en) 2017-07-18
BR112012017995A2 (en) 2016-05-03
CA2787480A1 (en) 2011-07-28
US9291171B2 (en) 2016-03-22
WO2011089355A1 (en) 2011-07-28
US20120308374A1 (en) 2012-12-06
RU2561790C2 (en) 2015-09-10
FR2955364B1 (en) 2012-11-16
FR2955364A1 (en) 2011-07-22
JP5755250B2 (en) 2015-07-29

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