EP1696134A2 - Regulation device for centering the unison ring for the variable stator vanes of a turbomachine. - Google Patents

Regulation device for centering the unison ring for the variable stator vanes of a turbomachine. Download PDF

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Publication number
EP1696134A2
EP1696134A2 EP06110207A EP06110207A EP1696134A2 EP 1696134 A2 EP1696134 A2 EP 1696134A2 EP 06110207 A EP06110207 A EP 06110207A EP 06110207 A EP06110207 A EP 06110207A EP 1696134 A2 EP1696134 A2 EP 1696134A2
Authority
EP
European Patent Office
Prior art keywords
shoe
ring
control ring
pad
shoe holder
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP06110207A
Other languages
German (de)
French (fr)
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EP1696134A3 (en
EP1696134B1 (en
Inventor
Alain Bromann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Safran Aircraft Engines SAS
Original Assignee
SNECMA SAS
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Publication date
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Publication of EP1696134A2 publication Critical patent/EP1696134A2/en
Publication of EP1696134A3 publication Critical patent/EP1696134A3/en
Application granted granted Critical
Publication of EP1696134B1 publication Critical patent/EP1696134B1/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
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/52—Casings; Connections of working fluid for axial pumps
    • F04D29/54—Fluid-guiding means, e.g. diffusers
    • F04D29/56—Fluid-guiding means, e.g. diffusers adjustable
    • F04D29/563—Fluid-guiding means, e.g. diffusers adjustable specially 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
    • F01D17/00—Regulating or controlling by varying flow
    • F01D17/10—Final actuators
    • F01D17/12—Final actuators arranged in stator parts
    • F01D17/14—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits
    • F01D17/16—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of nozzle vanes
    • F01D17/162—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of nozzle vanes for axial flow, i.e. the vanes turning around axes which are essentially perpendicular to the rotor centre line
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2230/00—Manufacture
    • F05D2230/60—Assembly methods
    • F05D2230/64—Assembly methods using positioning or alignment devices for aligning or centring, e.g. pins
    • F05D2230/644—Assembly methods using positioning or alignment devices for aligning or centring, e.g. pins for adjusting the position or the alignment, e.g. wedges or eccenters

Definitions

  • the present invention relates to the general field of devices for adjusting the centering of a synchronization ring controlling turbomachine pivoting vanes on the axis thereof.
  • stator vane stages In a turbomachine, it is known to use one or more stages of stator vanes for adjusting the flow and the flow direction of the gases passing through the compression section as a function of the operating speed of the turbomachine.
  • stator vane stages comprise a plurality of blades (called variable pitch vanes) which are pivotable about their stator connection axis so that their stall angle can be varied according to the operating speed of the stator. the turbomachine.
  • Known devices for controlling the variable pitch vanes usually comprise a control member in the form of a ring surrounding a casing of the turbomachine and a plurality of levers or links, each link having a first end connected to the control ring by a hinge and a second end mounted on the pivot of a respective blade.
  • the synchronized modification of the angular position of the blades is thus achieved by rotation of the ring around the axis of the turbomachine.
  • each pad is secured to a shoe holder with a rod which passes through the ring from one side and which is screwed into the ring from below it. Also, due to the presence of the casing shell, it is no longer possible to disassemble a pad from below the ring.
  • the main object of the present invention is thus to overcome such disadvantages by proposing a device for adjusting the centering of the ring that is simple, reliable and which saves time during assembly and disassembly.
  • a device for adjusting the centering of a control ring of turbine engine pivoting blades comprising a plurality of pads intended to come into contact with a circular surface coaxial with the ring, each pivoting blade. being connected to the control ring by means of a rod having a first end fixed to the control ring by a pin disposed radially on said ring and a second end mounted on a pivot of the blade, said pads being secured each of a shoe holder, characterized in that each shoe holder is fixed under the control ring by means of fastening systems which are intended to be assembled from above the ring.
  • Fixing under the control ring means a fixing of the shoe holder against an inner surface of the ring.
  • assembly from above the control ring is meant an assembly of fastening systems from the outside of the ring.
  • the device may further comprise means for adjusting the radial position of the pads.
  • the shoe holder advantageously comprises a substantially tubular portion which extends longitudinally from the control ring towards the inside thereof and which is adapted to receive a complementary tubular portion of the shoe, the device further comprising a screw intended to be screwed into the tubular portion of the pad so as to allow adjustment of the radial position of the pad.
  • the device may also comprise means for locking the pad in rotation in the shoe-holder.
  • the device may also comprise means for locking the screw in the pad.
  • a spring is interposed between the tubular portion of the shoe-holder and the tubular portion of the shoe so as to ensure damping of the shoe on the circular surface.
  • Each shoe-holder may be disposed in the radial extension of the dovetail pin with which it is associated.
  • each shoe holder can be advantageously fixed on the control ring by means of two attachment systems which are arranged symmetrically on either side of the blade of the blade with which it is associated.
  • each shoe-holder may be angularly offset relative to the pin of the blade with which it is associated.
  • the fastening systems each consist of a screw to be screwed into the control ring from above and a clamping nut.
  • FIG. 1 partially represents a turbomachine compressor of axis X-X.
  • the compressor comprises an annular stator envelope 10 which is centered on the X-X axis of the turbomachine and which surrounds an annular rotor 12 so as to define an annular stream 14 of gas flow.
  • the compressor further comprises a plurality of blades which form several stages in the flow channel 14, some of which are formed of variable-pitch vanes 16. These variable-pitch vanes 16 are pivotable about an axis 18 which passes through the stator casing 10.
  • Each axis (or pivot) 18 of the variable-pitch vanes 16 is connected to one end of a rod or control lever 20 via a nozzle 22.
  • the other end of the rods 20 is articulated around pins 24 arranged radially on a control ring 26 which surrounds a circular surface 28 centered on the axis XX of the turbomachine and to which it must be coaxial.
  • the invention relates to a device for adjusting the centering of the control ring 26 relative to the axis XX of the turbomachine. More specifically, such a device must be able to maintain a fixed radial spacing between the control ring 26 and the circular surface 28 which is centered on the axis XX.
  • the device for adjusting the centering of the control ring 26 comprises in particular a plurality of pads 30 intended to come into contact with the circular surface 28.
  • FIG. 2 The embodiment of the device of the invention illustrated in FIG. 2 will now be described.
  • Each shoe 30 is integral with a shoe holder 32.
  • the shoe holder 32 has a substantially tubular portion 34 which extends longitudinally from an inner surface 26a of the control ring 26 inwardly thereof.
  • the shoe 30 is for example crimped at the free end of the tubular portion 34.
  • tubular portion 34 of the shoe holder 32 ends with two fastening flanges 36 which come into contact with the inner surface 26a of the ring 26.
  • fastening systems 38 make it possible to fix the shoe holder 32 under the control ring 26.
  • screw 38a and radially pass through the ring 26 and tightening nuts 38b are screwed at their free end against the fastening flanges 36 of the shoe holder 32.
  • the screws 38a of these fastening systems 38 are assembled from the top of the ring, that is to say from the outside towards the inside thereof, and the nuts 38b are fixed under the control ring 26.
  • the shoe holder 32 may be disposed in the radial extension of the pin 24 of the blade with which it is associated.
  • the shoe holder 32 is advantageously fixed under the control ring 26 by means of two fastening systems 38 which are arranged symmetrically on either side of the trunnion 24 of the blade with which it is associated .
  • the shoe holder can be angularly offset relative to the pin of the blade with which it is associated.
  • the tubular portion 34 of the shoe-holder 30 which extends longitudinally from the control ring 26 inwardly thereof and which terminates in the two fastening flanges 36 is adapted to receive, for example by sliding, a complementary tubular portion 40 of the pad 30.
  • the pad 30 is crimped at a free end of its tubular portion 40.
  • the device further comprises a screw 42 intended to be screwed into the tubular portion 40 of the pad 30 so as to allow adjustment of the radial position thereof.
  • the tubular portion 40 of the shoe 30 has an internal thread (not shown in the figures) complementary to that of the screw.
  • the adjusting screw 42 extends longitudinally from the control ring 26 inwardly thereof. As illustrated in FIG. 3, the head of the screw 42 is thus trapped between the inner surface 26a of the ring 26 and the tubular portion 34 of the shoe holder 32.
  • Locking means of the adjusting screw 42 in the pad 30 are also provided to ensure a locking of the radial position thereof.
  • these locking means are in the form of a self-braking sleeve 44 interposed between the screw 42 and the tubular portion 40 of the shoe 30.
  • these locking means could be composed an elliptical deformation of the tapping or a self-braking insert thread or any other known means of braking a screw in a threaded passage.
  • the respective tubular portions 34, 40 of the shoe holder 32 and the shoe 30 each have a substantially polygonal cross-section so as to lock the shoe 30 in rotation in the shoe holder 32.
  • these straight sections are thus substantially square shape. Alternatively, they could be rectangular, triangular, hexagonal, etc.
  • the adjustment of the radial position of the pad 30 with respect to the circular surface 28 is effected as follows.
  • the device is first fixed under the control ring 26 by means of the attachment systems 38.
  • the screw 42 By screwing more or less the screw 42 in the tubular portion 40 of the pad, the latter slides (without rotation) in the tubular portion 34 of the shoe holder 32 which is fixed.
  • the pad 30 can thus move radially relative to the circular surface 28.
  • the self-braking sleeve 44 (or any other equivalent means) then allows to block the adjustment of the pad thus made.
  • the access to the adjusting screw 42 can be effected either by dismounting beforehand the control lever 20 and the pin 24 which is associated with it when the shoe holder 32 is disposed in the radial extension thereof. (case of Figure 3), or directly through a passage in the ring (not shown in the figures).
  • the device for adjusting the centering of the control ring further comprises a spring 46 which is interposed between the respective tubular portions 34, 40 of the shoe holder 32 and the shoe 30.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
  • Control Of Turbines (AREA)

Abstract

The device has pads (30) that are in contact with a circular surface (28) coaxial to a control ring (26). Pivoting vanes e.g. variable-pitch vanes, are connected to the ring via a lever (20). The lever has an end fixed to the ring via a crank pin (24) and another end mounted on a pivot of the vane. The crank pin is disposed radially on the ring. Each pad is fixed to a pad carrier (32). The pad carrier is fixed below the control ring by bolt type attachment systems (38). The attachment systems are assembled through top of the ring. A spring is placed between the carrier and the pads.

Description

Arrière-plan de l'inventionBackground of the invention

La présente invention se rapporte au domaine général des dispositifs de réglage du centrage d'un anneau de synchronisation de commande d'aubes pivotantes de turbomachine sur l'axe de celle-ci.The present invention relates to the general field of devices for adjusting the centering of a synchronization ring controlling turbomachine pivoting vanes on the axis thereof.

Dans une turbomachine, il est connu d'utiliser un ou plusieurs étages d'aubes de stator pour ajuster le flux et la direction d'écoulement des gaz traversant la section de compression en fonction du régime de fonctionnement de la turbomachine. Ces étages d'aubes de stator comportent une pluralité d'aubes (appelées aubes à calage variable) qui peuvent pivoter autour de leur axe de liaison au stator de manière à ce que leur angle de calage puisse être modifié en fonction du régime de fonctionnement de la turbomachine.In a turbomachine, it is known to use one or more stages of stator vanes for adjusting the flow and the flow direction of the gases passing through the compression section as a function of the operating speed of the turbomachine. These stator vane stages comprise a plurality of blades (called variable pitch vanes) which are pivotable about their stator connection axis so that their stall angle can be varied according to the operating speed of the stator. the turbomachine.

Les dispositifs connus pour la commande des aubes à calage variable comportent habituellement un organe de commande sous forme d'un anneau entourant un carter de la turbomachine et une pluralité de leviers ou biellettes, chaque biellette ayant une première extrémité reliée à l'anneau de commande par une articulation et une deuxième extrémité montée sur le pivot d'une aube respective. La modification synchronisée de la position angulaire des aubes est ainsi réalisée par rotation de l'anneau autour de l'axe de la turbomachine.Known devices for controlling the variable pitch vanes usually comprise a control member in the form of a ring surrounding a casing of the turbomachine and a plurality of levers or links, each link having a first end connected to the control ring by a hinge and a second end mounted on the pivot of a respective blade. The synchronized modification of the angular position of the blades is thus achieved by rotation of the ring around the axis of the turbomachine.

Afin d'améliorer le rendement des turbomachines, il est nécessaire d'augmenter la précision de l'angle de calage des aubes de stator. Pour ce faire, il est connu de chercher à assurer une excellente coaxialité entre l'anneau de commande de ces aubes et une surface circulaire de la turbomachine telle que l'enveloppe du carter. Cette coaxialité est généralement obtenue à l'aide de patins liés à l'anneau de commande par des dispositifs de montage et venant entourer l'enveloppe du carter avec un jeu très faible.In order to improve the efficiency of the turbomachines, it is necessary to increase the precision of the angle of adjustment of the stator vanes. To do this, it is known to seek to ensure excellent coaxiality between the control ring of these blades and a circular surface of the turbomachine such as the casing of the casing. This coaxiality is generally obtained using pads connected to the control ring by mounting devices and surrounding the casing housing with a very low clearance.

Les dispositifs de montage des patins sur l'anneau de commande doivent donc permettre le réglage des patins en direction radiale. On connaît ainsi le document US 5,387,080 qui divulgue un dispositif réglage de la coaxialité d'un anneau de commande utilisant des patins dont la position radiale est réglée grâce à une vis double dont les deux portions ont des angles d'hélice différant légèrement.The mounting devices of the pads on the control ring must therefore allow the adjustment of the pads in the radial direction. Document US Pat. No. 5,387,080 discloses a device for adjusting the coaxiality of a control ring using skids whose radial position is adjusted by means of a double screw whose two portions have slightly different helix angles.

Avec ce type de dispositif, il a été constaté que pendant les différentes phases de fonctionnement de la turbomachine certains patins ne sont plus en contact avec l'enveloppe du carter, ce qui entraîne des vibrations provoquant une usure complète du filetage de la vis double. Il en résulte que le réglage du jeu entre les patins et l'enveloppe du carter n'est alors plus possible.With this type of device, it has been found that during the various phases of operation of the turbomachine some pads are no longer in contact with the casing of the casing, which causes vibrations causing complete wear of the thread of the double screw. As a result, adjustment of the clearance between the pads and the housing casing is then no longer possible.

En outre, avec ce dispositif, il n'est pas possible de démonter un ou plusieurs patins sans avoir à démonter l'ensemble des pièces de l'étage d'aubes à calage variable, et notamment l'anneau de commande. En effet, chaque patin est solidaire d'un porte-patin muni d'une tige qui traverse l'anneau de part en part et qui est vissée dans l'anneau par le dessous de celui-ci. Aussi, en raison de la présence de l'enveloppe de carter, il n'est plus possible de démonter un patin par le dessous de l'anneau.In addition, with this device, it is not possible to disassemble one or more pads without having to disassemble all the parts of the variable-pitch blade stage, and in particular the control ring. Indeed, each pad is secured to a shoe holder with a rod which passes through the ring from one side and which is screwed into the ring from below it. Also, due to the presence of the casing shell, it is no longer possible to disassemble a pad from below the ring.

Objet et résumé de l'inventionObject and summary of the invention

La présente invention a donc pour but principal de pallier de tels inconvénients en proposant un dispositif de réglage du centrage de l'anneau simple, fiable et permettant un gain de temps au montage et au démontage.The main object of the present invention is thus to overcome such disadvantages by proposing a device for adjusting the centering of the ring that is simple, reliable and which saves time during assembly and disassembly.

A cet effet, il est prévu un dispositif de réglage du centrage d'un anneau de commande d'aubes pivotantes de turbomachine, comportant une pluralité de patins destinés à venir en contact d'une surface circulaire coaxiale à l'anneau, chaque aube pivotante étant reliée à l'anneau de commande au moyen d'une biellette ayant une première extrémité fixée à l'anneau de commande par un tourillon disposé radialement sur ledit anneau et une deuxième extrémité montée sur un pivot de l'aube, lesdits patins étant solidaires chacun d'un porte-patin, caractérisé en ce que chaque porte-patin est fixé sous l'anneau de commande au moyen de systèmes d'attache qui sont destinés à être assemblés par le dessus de l'anneau.For this purpose, there is provided a device for adjusting the centering of a control ring of turbine engine pivoting blades, comprising a plurality of pads intended to come into contact with a circular surface coaxial with the ring, each pivoting blade. being connected to the control ring by means of a rod having a first end fixed to the control ring by a pin disposed radially on said ring and a second end mounted on a pivot of the blade, said pads being secured each of a shoe holder, characterized in that each shoe holder is fixed under the control ring by means of fastening systems which are intended to be assembled from above the ring.

Par fixation sous l'anneau de commande, on entend une fixation du porte-patin contre une surface interne de l'anneau. Par assemblage par le dessus de l'anneau de commande, on entend un assemblage des systèmes d'attache par l'extérieur de l'anneau.Fixing under the control ring means a fixing of the shoe holder against an inner surface of the ring. By assembly from above the control ring is meant an assembly of fastening systems from the outside of the ring.

Le fait de fixer chaque porte-patin sous l'anneau en utilisant des systèmes d'attache assemblés par le dessus de l'anneau permet un démontage des systèmes d'attache par le dessus de l'anneau. Lorsque l'on souhaite intervenir sur un patin, il n'est donc pas nécessaire de démonter l'anneau de commande et chaque pièce du système de calage variable. De la sorte, le montage et le démontage des patins se trouvent grandement facilité.Attaching each shoe holder under the ring using fastening systems assembled from the top of the ring allows disassembly of the fastening systems from above the ring. When it is desired to intervene on a pad, it is therefore not necessary to disassemble the control ring and each piece of the variable locking system. In this way, the assembly and disassembly of the pads are greatly facilitated.

Selon une caractéristique particulière de l'invention, le dispositif peut en outre comporter des moyens de réglage de la position radiale des patins.According to a particular characteristic of the invention, the device may further comprise means for adjusting the radial position of the pads.

Ainsi, le porte-patin comporte avantageusement une partie sensiblement tubulaire qui s'étend longitudinalement depuis l'anneau de commande vers l'intérieur de celui-ci et qui est apte à recevoir une partie tubulaire complémentaire du patin, le dispositif comportant en outre une vis destinée à être vissée dans la partie tubulaire du patin de façon à permettre un réglage de la position radiale du patin.Thus, the shoe holder advantageously comprises a substantially tubular portion which extends longitudinally from the control ring towards the inside thereof and which is adapted to receive a complementary tubular portion of the shoe, the device further comprising a screw intended to be screwed into the tubular portion of the pad so as to allow adjustment of the radial position of the pad.

Selon une autre caractéristique particulière de l'invention, le dispositif peut également comporter des moyens de blocage en rotation du patin dans le porte-patin.According to another particular characteristic of the invention, the device may also comprise means for locking the pad in rotation in the shoe-holder.

Selon encore une autre caractéristique particulière de l'invention, le dispositif peut aussi comporter des moyens de blocage de la vis dans le patin.According to yet another particular characteristic of the invention, the device may also comprise means for locking the screw in the pad.

De préférence, un ressort est intercalé entre la partie tubulaire du porte-patin et la partie tubulaire du patin de façon à assurer un amortissement du patin sur la surface circulaire.Preferably, a spring is interposed between the tubular portion of the shoe-holder and the tubular portion of the shoe so as to ensure damping of the shoe on the circular surface.

Chaque porte-patin peut être disposé dans le prolongement radial du tourillon de l'aube à laquelle il est associé. Dans ce cas, chaque porte-patin peut être avantageusement fixé sur l'anneau de commande au moyen de deux systèmes d'attache qui sont disposés symétriquement de part et d'autre du tourillon de l'aube à laquelle il est associé.Each shoe-holder may be disposed in the radial extension of the dovetail pin with which it is associated. In this case, each shoe holder can be advantageously fixed on the control ring by means of two attachment systems which are arranged symmetrically on either side of the blade of the blade with which it is associated.

Alternativement, chaque porte-patin peut être décalé angulairement par rapport au tourillon de l'aube à laquelle il est associé.Alternatively, each shoe-holder may be angularly offset relative to the pin of the blade with which it is associated.

De préférence, les systèmes d'attache se composent chacun d'une vis destinée à être vissée dans l'anneau de commande par le dessus de celui-ci et d'un écrou de serrage.Preferably, the fastening systems each consist of a screw to be screwed into the control ring from above and a clamping nut.

Brève description des dessinsBrief description of the drawings

D'autres caractéristiques et avantages de la présente invention ressortiront de la description faite ci-dessous, en référence aux dessins annexés qui en illustrent un exemple de réalisation dépourvu de tout caractère limitatif. Sur les figures :

  • la figure 1 représente schématiquement un étage d'aubes pivotantes à anneau de commande ;
  • la figure 2 est une vue en coupe d'un dispositif de réglage selon un mode de réalisation de l'invention ;
  • la figure 3 est une vue en coupe d'un dispositif de réglage selon un autre mode de réalisation de l'invention ;
  • la figure 4 est une vue en coupe selon IV-IV de la figure 3 ; et
  • la figure 5 est une vue en coupe d'un dispositif de réglage selon encore un autre mode de réalisation de l'invention.
Other features and advantages of the present invention will emerge from the description given below, with reference to the accompanying drawings which illustrate an embodiment having no limiting character. In the figures:
  • FIG. 1 schematically represents a stage of pivoting vanes with a control ring;
  • Figure 2 is a sectional view of an adjusting device according to one embodiment of the invention;
  • Figure 3 is a sectional view of an adjusting device according to another embodiment of the invention;
  • Figure 4 is a sectional view along line IV-IV of Figure 3; and
  • Figure 5 is a sectional view of a control device according to yet another embodiment of the invention.

Description détaillée d'un mode de réalisationDetailed description of an embodiment

La figure 1 représente partiellement un compresseur de turbomachine d'axe X-X. Le compresseur comporte une enveloppe annulaire de stator 10 qui est centrée sur l'axe X-X de la turbomachine et qui entoure un rotor annulaire 12 de manière à définir une veine annulaire 14 d'écoulement des gaz.FIG. 1 partially represents a turbomachine compressor of axis X-X. The compressor comprises an annular stator envelope 10 which is centered on the X-X axis of the turbomachine and which surrounds an annular rotor 12 so as to define an annular stream 14 of gas flow.

Le compresseur comporte en outre une pluralité d'aubes qui forment plusieurs étages dans la veine d'écoulement 14, dont certains sont formés d'aubes à calage variable 16. Ces aubes à calage variable 16 sont pivotantes autour d'un axe 18 qui traverse l'enveloppe de stator 10.The compressor further comprises a plurality of blades which form several stages in the flow channel 14, some of which are formed of variable-pitch vanes 16. These variable-pitch vanes 16 are pivotable about an axis 18 which passes through the stator casing 10.

Chaque axe (ou pivot) 18 des aubes à calage variable 16 est relié à une extrémité d'une biellette ou levier de commande 20 par l'intermédiaire d'un embout 22. L'autre extrémité des biellettes 20 est articulée autour de tourillons 24 disposés radialement sur un anneau de commande 26 qui entoure une surface circulaire 28 centrée sur l'axe X-X de la turbomachine et à laquelle il doit être coaxial.Each axis (or pivot) 18 of the variable-pitch vanes 16 is connected to one end of a rod or control lever 20 via a nozzle 22. The other end of the rods 20 is articulated around pins 24 arranged radially on a control ring 26 which surrounds a circular surface 28 centered on the axis XX of the turbomachine and to which it must be coaxial.

L'invention vise un dispositif permettant de régler le centrage de l'anneau de commande 26 par rapport à l'axe X-X de la turbomachine. Plus précisément, un tel dispositif doit être capable de maintenir un espacement radial fixe entre l'anneau de commande 26 et la surface circulaire 28 qui est centrée sur l'axe X-X.The invention relates to a device for adjusting the centering of the control ring 26 relative to the axis XX of the turbomachine. More specifically, such a device must be able to maintain a fixed radial spacing between the control ring 26 and the circular surface 28 which is centered on the axis XX.

Comme illustré sur les figures 2 à 5, le dispositif de réglage du centrage de l'anneau de commande 26 selon l'invention comporte notamment une pluralité de patins 30 destinés à venir en contact de la surface circulaire 28.As illustrated in FIGS. 2 to 5, the device for adjusting the centering of the control ring 26 according to the invention comprises in particular a plurality of pads 30 intended to come into contact with the circular surface 28.

On décrira maintenant le mode de réalisation du dispositif de l'invention illustré par la figure 2.The embodiment of the device of the invention illustrated in FIG. 2 will now be described.

Chaque patin 30 est solidaire d'un porte-patin 32. Le porte-patin 32 présente une partie 34 sensiblement tubulaire qui s'étend longitudinalement depuis une surface interne 26a de l'anneau de commande 26 vers l'intérieur de celui-ci. Le patin 30 est par exemple serti à l'extrémité libre de la partie tubulaire 34.Each shoe 30 is integral with a shoe holder 32. The shoe holder 32 has a substantially tubular portion 34 which extends longitudinally from an inner surface 26a of the control ring 26 inwardly thereof. The shoe 30 is for example crimped at the free end of the tubular portion 34.

Au niveau de son extrémité opposée au patin 30, la partie tubulaire 34 du porte-patin 32 se termine par deux brides de fixation 36 qui viennent en contact de la surface interne 26a de l'anneau 26.At its end opposite the shoe 30, the tubular portion 34 of the shoe holder 32 ends with two fastening flanges 36 which come into contact with the inner surface 26a of the ring 26.

Par l'intermédiaire de ces brides 36, des systèmes d'attache 38, par exemple de type boulonnage, permettent de fixer le porte-patin 32 sous l'anneau de commande 26. Sur l'exemple de réalisation de la figure 2, deux vis 38a traversent ainsi radialement l'anneau 26 et des écrous de serrage 38b sont vissés à leur extrémité libre contre les brides de fixation 36 du porte-patin 32.By means of these flanges 36, fastening systems 38, for example of the bolting type, make it possible to fix the shoe holder 32 under the control ring 26. In the embodiment of FIG. screw 38a and radially pass through the ring 26 and tightening nuts 38b are screwed at their free end against the fastening flanges 36 of the shoe holder 32.

Comme illustré sur la figure 2, les vis 38a de ces systèmes d'attache 38 sont assemblées par le dessus de l'anneau, c'est-à-dire de l'extérieur vers l'intérieur de celui-ci, et les écrous de serrage 38b sont fixés sous l'anneau de commande 26.As illustrated in Figure 2, the screws 38a of these fastening systems 38 are assembled from the top of the ring, that is to say from the outside towards the inside thereof, and the nuts 38b are fixed under the control ring 26.

Ainsi, il est possible d'agir aisément sur les écrous de serrage 38b par le dessous de l'anneau et de dévisser les vis 38a par le dessus de l'anneau sans avoir à démonter l'anneau de commande et les pièces fixées sur celui-ci. De la sorte, le démontage du porte-patin 32 peut être réalisé simplement en agissant sur ces systèmes d'attache et sans avoir à toucher à l'anneau de commande.Thus, it is possible to easily act on the tightening nuts 38b from below the ring and to unscrew the screws 38a from above the ring without having to disassemble the control ring and the parts fixed on the ring. -this. In this way, the disassembly of the shoe holder 32 can be achieved simply by acting on these fastening systems and without having to touch the control ring.

Comme le montre l'exemple de la figure 2, le porte-patin 32 peut être disposé dans le prolongement radial du tourillon 24 de l'aube à laquelle il est associé. Dans ce cas, le porte-patin 32 est avantageusement fixé sous l'anneau de commande 26 au moyen de deux systèmes d'attache 38 qui sont disposés symétriquement de part et d'autre du tourillon 24 de l'aube à laquelle il est associé.As shown in the example of Figure 2, the shoe holder 32 may be disposed in the radial extension of the pin 24 of the blade with which it is associated. In this case, the shoe holder 32 is advantageously fixed under the control ring 26 by means of two fastening systems 38 which are arranged symmetrically on either side of the trunnion 24 of the blade with which it is associated .

Alternativement, selon une variante de réalisation non représentée sur les figures, le porte-patin peut être décalé angulairement par rapport au tourillon de l'aube à laquelle il est associé.Alternatively, according to an alternative embodiment not shown in the figures, the shoe holder can be angularly offset relative to the pin of the blade with which it is associated.

Dans l'exemple de réalisation de la figure 2, on remarquera également que la position radiale du patin 30 par rapport à la surface circulaire 28 n'est pas réglable. Cette solution nécessite donc de bien maîtriser les tolérances dimensionnelles des pièces du dispositif pour assurer un jeu fonctionnel entre le patin et la surface circulaire.In the embodiment of Figure 2, it will also be noted that the radial position of the pad 30 relative to the circular surface 28 is not adjustable. This solution therefore requires good control of the dimensional tolerances of the parts of the device to ensure a functional clearance between the pad and the circular surface.

On décrira maintenant le mode de réalisation du dispositif de l'invention illustré par les figures 3 et 4. Les éléments en commun avec le dispositif de la figure 2 sont identifiés par les mêmes références et ne seront donc pas décrits à nouveau.We will now describe the embodiment of the device of the invention illustrated in Figures 3 and 4. The elements in common with the device of Figure 2 are identified by the same references and will not be described again.

Par rapport au mode de réalisation décrit précédemment, la partie tubulaire 34 du porte-patin 30 qui s'étend longitudinalement depuis l'anneau de commande 26 vers l'intérieur de celui-ci et qui se termine par les deux brides de fixation 36 est apte à recevoir, par exemple par coulissement, une partie tubulaire complémentaire 40 du patin 30. Dans cette situation, le patin 30 est serti à une extrémité libre de sa partie tubulaire 40.Compared to the embodiment described above, the tubular portion 34 of the shoe-holder 30 which extends longitudinally from the control ring 26 inwardly thereof and which terminates in the two fastening flanges 36 is adapted to receive, for example by sliding, a complementary tubular portion 40 of the pad 30. In this situation, the pad 30 is crimped at a free end of its tubular portion 40.

Le dispositif comporte en outre une vis 42 destinée à être vissée dans la partie tubulaire 40 du patin 30 de façon à permettre un réglage de la position radiale de celui-ci. A cet effet, la partie tubulaire 40 du patin 30 présente un taraudage interne (non représenté sur les figures) complémentaire à celui de la vis.The device further comprises a screw 42 intended to be screwed into the tubular portion 40 of the pad 30 so as to allow adjustment of the radial position thereof. For this purpose, the tubular portion 40 of the shoe 30 has an internal thread (not shown in the figures) complementary to that of the screw.

La vis de réglage 42 s'étend longitudinalement depuis l'anneau de commande 26 vers l'intérieur de celui-ci. Comme illustré par la figure 3, la tête de la vis 42 est ainsi emprisonnée entre la surface interne 26a de l'anneau 26 et la partie tubulaire 34 du porte-patin 32.The adjusting screw 42 extends longitudinally from the control ring 26 inwardly thereof. As illustrated in FIG. 3, the head of the screw 42 is thus trapped between the inner surface 26a of the ring 26 and the tubular portion 34 of the shoe holder 32.

Des moyens de blocage de la vis de réglage 42 dans le patin 30 sont par ailleurs prévus afin d'assurer un blocage de la position radiale de celui-ci.Locking means of the adjusting screw 42 in the pad 30 are also provided to ensure a locking of the radial position thereof.

Sur l'exemple des figures 3 et 4, ces moyens de blocage se présentent sous la forme d'une douille auto-freinante 44 interposée entre la vis 42 et la partie tubulaire 40 du patin 30. Alternativement, ces moyens de blocage pourraient être composés d'une déformation elliptique du taraudage ou d'un filet rapporté auto-freinant ou de tout autre moyen connu de freinage d'une vis dans un passage taraudé.In the example of Figures 3 and 4, these locking means are in the form of a self-braking sleeve 44 interposed between the screw 42 and the tubular portion 40 of the shoe 30. Alternatively, these locking means could be composed an elliptical deformation of the tapping or a self-braking insert thread or any other known means of braking a screw in a threaded passage.

Selon une caractéristique avantageuse de l'invention, les parties tubulaires 34, 40 respectives du porte-patin 32 et du patin 30 présentent chacune une section droite sensiblement polygonale de façon à bloquer en rotation le patin 30 dans le porte-patin 32.According to an advantageous characteristic of the invention, the respective tubular portions 34, 40 of the shoe holder 32 and the shoe 30 each have a substantially polygonal cross-section so as to lock the shoe 30 in rotation in the shoe holder 32.

Sur l'exemple de la figure 4, ces sections droites sont ainsi de forme sensiblement carrée. Alternativement, elles pourraient être rectangulaire, triangulaire, hexagonale, etc.In the example of Figure 4, these straight sections are thus substantially square shape. Alternatively, they could be rectangular, triangular, hexagonal, etc.

Le réglage de la position radiale du patin 30 par rapport à la surface circulaire 28 s'effectue de la manière suivante. Le dispositif est d'abord fixé sous l'anneau de commande 26 au moyen des systèmes d'attache 38. En vissant plus ou moins la vis 42 dans la partie tubulaire 40 du patin, cette dernière coulisse (sans rotation) dans la partie tubulaire 34 du porte-patin 32 qui est fixe.The adjustment of the radial position of the pad 30 with respect to the circular surface 28 is effected as follows. The device is first fixed under the control ring 26 by means of the attachment systems 38. By screwing more or less the screw 42 in the tubular portion 40 of the pad, the latter slides (without rotation) in the tubular portion 34 of the shoe holder 32 which is fixed.

Sous l'effet du vissage, le patin 30 peut ainsi se déplacer radialement par rapport à la surface circulaire 28. La douille auto-freinante 44 (ou tout autre moyen équivalent) permet alors de bloquer le réglage du patin ainsi effectué.Under the effect of the screwing, the pad 30 can thus move radially relative to the circular surface 28. The self-braking sleeve 44 (or any other equivalent means) then allows to block the adjustment of the pad thus made.

On notera que l'accès à la vis de réglage 42 peut s'effectuer soit en démontant au préalable le levier de commande 20 et le tourillon 24 qui lui est associé lorsque le porte-patin 32 est disposé dans le prolongement radial de celui-ci (cas de la figure 3), soit directement au travers d'un passage prévu dans l'anneau (cas non représenté sur les figures).It will be noted that the access to the adjusting screw 42 can be effected either by dismounting beforehand the control lever 20 and the pin 24 which is associated with it when the shoe holder 32 is disposed in the radial extension thereof. (case of Figure 3), or directly through a passage in the ring (not shown in the figures).

On décrira maintenant le mode de réalisation du dispositif de l'invention illustré par la figure 5. Les éléments en commun avec le dispositif des figures 3 et 4 sont identifiés par les mêmes références et ne seront donc pas décrits à nouveau.We will now describe the embodiment of the device of the invention illustrated in Figure 5. The elements in common with the device of Figures 3 and 4 are identified by the same references and will not be described again.

Par rapport au mode de réalisation décrit précédemment, le dispositif de réglage du centrage de l'anneau de commande comporte en outre un ressort 46 qui est intercalé entre les parties tubulaires 34, 40 respectives du porte-patin 32 et du patin 30.Compared to the embodiment described above, the device for adjusting the centering of the control ring further comprises a spring 46 which is interposed between the respective tubular portions 34, 40 of the shoe holder 32 and the shoe 30.

La présence d'un tel ressort 46 a pour effet d'assurer, sur l'ensemble de l'anneau de commande 26, un amortissement des patins 30 sur la surface circulaire 28.The presence of such a spring 46 has the effect of ensuring, over the entire control ring 26, a damping of the pads 30 on the circular surface 28.

Par l'intermédiaire de tels ressorts, il est en effet possible d'amortir les vibrations qui se produisent au niveau de l'anneau de commande 26 et qui sont transmises aux patins 30. De la sorte, l'adjonction d'un ressort entre le porte-patin et le patin permet d'avoir un contact permanent entre la surface circulaire 28 et les patins 30 pendant les différentes phases de fonctionnement de la turbomachine.By means of such springs, it is indeed possible to damp the vibrations that occur at the control ring 26 and which are transmitted to the pads 30. In this way, the addition of a spring between the shoe-holder and the shoe makes it possible to have a permanent contact between the circular surface 28 and the shoes 30 during the various phases of operation of the turbomachine.

Claims (11)

Dispositif de réglage du centrage d'un anneau de commande (26) d'aubes pivotantes (16) de turbomachine, comportant une pluralité de patins (30) destinés à venir en contact d'une surface circulaire (28) coaxiale à l'anneau (26), chaque aube pivotante (16) étant reliée à l'anneau de commande (26) au moyen d'une biellette (20) ayant une première extrémité fixée à l'anneau de commande par un tourillon (24) disposé radialement sur ledit anneau et une deuxième extrémité montée sur un pivot (18) de l'aube (16), lesdits patins (30) étant solidaires chacun d'un porte-patin (32), caractérisé en ce que chaque porte-patin (32) est fixé sous l'anneau de commande (26) au moyen de systèmes d'attache (38) qui sont destinés à être assemblés par le dessus de l'anneau.Device for adjusting the centering of a control ring (26) of turbomachine pivoting vanes (16), comprising a plurality of pads (30) intended to come into contact with a circular surface (28) coaxial with the ring (26), each swivel blade (16) being connected to the control ring (26) by means of a rod (20) having a first end fixed to the control ring by a pin (24) arranged radially on said ring and a second end mounted on a pivot (18) of the blade (16), said pads (30) being each secured to a shoe holder (32), characterized in that each shoe holder (32) is fixed under the control ring (26) by means of fastening systems (38) which are intended to be assembled from above the ring. Dispositif selon la revendication 1, caractérisé en ce qu'il comporte en outre des moyens (42) de réglage de la position radiale des patins (30).Device according to claim 1, characterized in that it further comprises means (42) for adjusting the radial position of the pads (30). Dispositif selon la revendication 2, caractérisé en ce que le porte-patin (32) comporte une partie sensiblement tubulaire (34) qui s'étend longitudinalement depuis l'anneau de commande (26) vers l'intérieur de celui-ci et qui est apte à recevoir une partie tubulaire complémentaire (40) du patin (30), le dispositif comportant en outre une vis (42) destinée à être vissée dans la partie tubulaire (40) du patin (30) de façon à permettre un réglage de la position radiale du patin.Device according to claim 2, characterized in that the shoe carrier (32) has a substantially tubular portion (34) extending longitudinally from the control ring (26) towards the inside thereof and which is adapted to receive a complementary tubular portion (40) of the pad (30), the device further comprising a screw (42) intended to be screwed into the tubular portion (40) of the pad (30) so as to allow adjustment of the radial position of the pad. Dispositif selon la revendication 3, caractérisé en ce qu'il comporte en outre des moyens de blocage en rotation du patin (30) dans le porte-patin (32).Device according to claim 3, characterized in that it further comprises means for locking the pad (30) in rotation in the shoe holder (32). Dispositif selon la revendication 4, caractérisé en ce que les parties tubulaires respectives (34, 40) du porte-patin (32) et du patin (30) présentent chacune une section droite sensiblement polygonale de façon à bloquer en rotation le patin (30) dans le porte-patin (32).Device according to claim 4, characterized in that the respective tubular portions (34, 40) of the shoe holder (32) and the shoe (30) each have a substantially polygonal cross-section so as to lock the shoe (30) in rotation. in the shoe holder (32). Dispositif selon l'une quelconque des revendications 3 à 5, caractérisé en ce qu'il comporte en outre des moyens (44) de blocage de la vis de réglage (42) dans le patin (30).Device according to any one of claims 3 to 5, characterized in that it further comprises means (44) for locking the adjusting screw (42) in the pad (30). Dispositif selon l'une quelconque des revendications 3 à 6, caractérisé en ce qu'il comporte en outre un ressort (46) intercalé entre la partie tubulaire (34) du porte-patin (32) et la partie tubulaire (40) du patin (30) de façon à assurer un amortissement du patin sur la surface circulaire (28).Device according to any one of claims 3 to 6, characterized in that it further comprises a spring (46) interposed between the tubular portion (34) of the shoe holder (32) and the tubular portion (40) of the shoe (30) to provide cushioning of the pad on the circular surface (28). Dispositif selon l'une quelconque des revendications 1 à 7, caractérisé en ce que chaque porte-patin (32) est disposé dans le prolongement radial du tourillon (24) de l'aube à laquelle il est associé.Device according to any one of claims 1 to 7, characterized in that each shoe holder (32) is disposed in the radial extension of the pin (24) of the blade with which it is associated. Dispositif selon la revendication 8, caractérisé en ce que chaque porte-patin (32) est fixé sur l'anneau de commande (26) au moyen de deux systèmes d'attache (38) qui sont disposés symétriquement de part et d'autre du tourillon (24) de l'aube à laquelle il est associé.Device according to claim 8, characterized in that each shoe holder (32) is fixed on the control ring (26) by means of two attachment systems (38) which are arranged symmetrically on either side of the trunnion (24) of the dawn with which it is associated. Dispositif selon l'une quelconque des revendications 1 à 7, caractérisé en ce que chaque porte-patin (32) est décalé angulairement par rapport au tourillon (24) de l'aube à laquelle il est associé.Device according to any one of claims 1 to 7, characterized in that each shoe holder (32) is offset angularly relative to the pin (24) of the blade with which it is associated. Dispositif selon l'une quelconque des revendications 1 à 10, caractérisé en ce que les systèmes d'attache (38) se composent chacun d'une vis (38a) destinée à être vissée dans l'anneau de commande (26) par le dessus de celui-ci et d'un écrou de serrage (38b).Device according to any one of claims 1 to 10, characterized in that the fastening systems (38) each consist of a screw (38a) to be screwed into the control ring (26) from above. of it and a clamping nut (38b).
EP06110207.5A 2005-02-25 2006-02-21 Regulation device for centering the unison ring for the variable stator vanes of a turbomachine. Active EP1696134B1 (en)

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FR0501931A FR2882578B1 (en) 2005-02-25 2005-02-25 DEVICE FOR ADJUSTING THE CENTERING OF A SYNCHRONIZATION RING FOR THE CONTROL OF TURBOMACHINE SWIVELING BLADES

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EP (1) EP1696134B1 (en)
JP (1) JP4887059B2 (en)
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RU2006105521A (en) 2007-08-27
CN1824957B (en) 2012-05-16
US20060193720A1 (en) 2006-08-31
EP1696134A3 (en) 2012-11-14
FR2882578A1 (en) 2006-09-01
US7244098B2 (en) 2007-07-17
JP2006233969A (en) 2006-09-07
CN1824957A (en) 2006-08-30
FR2882578B1 (en) 2007-05-25
CA2537435C (en) 2013-06-18
JP4887059B2 (en) 2012-02-29
CA2537435A1 (en) 2006-08-25
RU2395694C2 (en) 2010-07-27
EP1696134B1 (en) 2014-04-02

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