EP0488874B1 - Fan rotor with blades without platforms and fillers reconstructing the streamline profile - Google Patents

Fan rotor with blades without platforms and fillers reconstructing the streamline profile Download PDF

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Publication number
EP0488874B1
EP0488874B1 EP91403182A EP91403182A EP0488874B1 EP 0488874 B1 EP0488874 B1 EP 0488874B1 EP 91403182 A EP91403182 A EP 91403182A EP 91403182 A EP91403182 A EP 91403182A EP 0488874 B1 EP0488874 B1 EP 0488874B1
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EP
European Patent Office
Prior art keywords
disc
shoe
blades
shoes
wall
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.)
Expired - Lifetime
Application number
EP91403182A
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German (de)
French (fr)
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EP0488874A1 (en
Inventor
Michel Antoine Brioude
Philippe Chereau
Jacky Naudet
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Safran Aircraft Engines SAS
Original Assignee
Societe Nationale dEtude et de Construction de Moteurs dAviation SNECMA
SNECMA SAS
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Publication of EP0488874A1 publication Critical patent/EP0488874A1/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
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/32—Rotors specially for elastic fluids for axial flow pumps
    • F04D29/321—Rotors specially for elastic fluids for axial flow pumps for axial flow compressors
    • F04D29/322—Blade mountings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
    • F01D11/005—Sealing means between non relatively rotating elements
    • F01D11/006—Sealing the gap between rotor blades or blades and rotor
    • F01D11/008—Sealing the gap between rotor blades or blades and rotor by spacer elements between the blades, e.g. independent interblade platforms
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
    • F01D5/12—Blades
    • F01D5/22—Blade-to-blade connections, e.g. for damping vibrations
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S416/00—Fluid reaction surfaces, i.e. impellers
    • Y10S416/50—Vibration damping features

Definitions

  • the present invention relates to a rotor of known type of fan or compressor of a turbomachine, of the type comprising a rotor disc, a series of radial blades mounted in axial housings produced in the periphery of said disc, a series of shoes arranged between said vanes in order to maintain the spacing between said vanes and to constitute the internal profile of the annular stream of fluid circulating from upstream to downstream of said stage, means for fixing said shoes on said disc each of said shoes having an outer wall defining the internal profile of the vein and distant from the periphery of said disc, the axial ends of said external wall being located substantially in the planes of the front and rear faces of said disc.
  • turbomachine rotor is particularly used in large diameter stages, because it is imperative, on the one hand, to limit the diameter of the disc carrying the blades because of the considerable centrifugal force obtained at the high rotational speeds of the turbomachine, and, on the other hand, to increase the internal diameter of the annular stream of fluid flowing upstream downstream of the stage so as to have a substantially uniform fluid flow speed throughout the cross section of the stream.
  • the British document GB-2 006 883 in particular shows a rotor for a turbomachine stage of the type mentioned above.
  • the shoe described in this document comprises, at the rear, a hook directed upwards which cooperates with a groove provided in correspondence in a first retaining ring fixed by a bayonet device on the rear face of the disc, and it comprises, at the front, a rib which extends towards the axis of the disc and which cooperates with the front face of the disc to prevent the axial displacement of the shoe towards the back.
  • a second retaining ring, fixed by bolting, is provided on the front face of the disc to connect the front end of the shoe with said disc.
  • the shoe In this method of construction and attachment, the shoe must have an internal wall which is only partially supported on the periphery of the disc so as to be able to engage the rear hook in the corresponding groove of the first retaining ring by pivoting. shoe on the periphery of the disc. This results in a complex configuration of the hoof and an increase in weight.
  • the bayonet device used to fix the first retaining ring on the rear face of the disc requires delicate machining of the disc and of this ring.
  • FR-A 1 134 548 shows a device in which each of the shoes has a front wall and a rear wall which extend radially towards the axis of the turbomachine from said axial ends of the external wall so as to cover at least partially the front and rear faces of said disc and, in which the means for fixing said shoes to said disc comprise, for each of said shoes, at least one front hook extending axially rearwards from its front wall and at least one rear hook which extends forward from its rear wall, and grooves formed in said disc in correspondence with said hooks, said grooves extending between the ends of the mounting housings of the two blades adjacent to said shoe, said grooves and said hooks being shaped and dimensioned so that said shoe can be mounted by presentation to the right of a mounting housing and sliding of said shoe in the plane of the disc.
  • the grooves and the hooks cooperate with one another to retain the shoe radially during the rotation of the disc.
  • the front and rear walls of the shoe cooperate with the disc to axially retain the shoe forwards and backwards.
  • the grooves are preferably circular in shape, the center of which is on the axis of the turbomachine. But this is not compulsory. Their shape must allow the mounting of the shoe by sliding it in the plane of the disc.
  • each shoe has at least one cleat which extends from its rear wall to at least partially cover a mounting housing adjacent to said shoe and has a locking tab extending radially towards the axis of the turbomachine from its front wall, said locking tab being spaced from the front face of said disc and cooperating with an additional groove of the disc, means of axial retention of the blades in their respective housings being provided, the means of axial retention of said series of blades being formed, upstream of said stage, by said tabs and, downstream of said stage, by an annular segment interposed between the front face of said disc and said locking tabs.
  • each shoe also has a central partition which extends from its external wall towards the periphery of the disc and is substantially parallel to the plane of the adjacent blades, said partition having a slot in the vicinity of said external wall, and it is equipped with a vibration damper formed by a spring leaf passing through said slot and damping plates provided at the ends of said spring leaf.
  • each shoe also has additional walls extending from the underside of the external wall and serving as a stop for shock absorber pads.
  • the drawing shows a rotor 1 of a stage of a turbomachine, in which the blades 2 are fixed in axial housings 3 provided on the periphery 4 of a disc 5.
  • the blades 2 are of the type without platform.
  • the internal profile of the stream of fluid flowing upstream downstream of the blade stage is obtained by the external wall 6 of shoes 7 arranged between the blades 2 and fixed to the disc 5. Each shoe 7 further maintains the spacing between two adjacent blades 2.
  • Each shoe 7 has a front wall 8 which extends radially towards the axis of the turbomachine from the front end 9 of the external wall 6 and which at least partially covers the front face 10 of the disc 5. It has in addition, a rear wall 11 which extends radially towards the axis of the turbomachine from the rear end 12 of the external wall 6 and which at least partially covers the rear face 13 of the disc 5.
  • the portions of the front 8 and rear 11 walls which cover the front 10 and rear 13 faces of the disc 5 have each at least one hook which extends axially towards the disc 5 and cooperates with a groove formed in correspondence in the wall of the disc 5.
  • the front wall 8 thus comprises at least one front hook 14 which extends towards the rear and cooperates with the groove 15, and the rear wall 11 has at least one hook 16 which extends forward and cooperates with the groove 17.
  • the front grooves 15 and rear 17 of the disc 5 extend between the axial housings 3 used for mounting the two blades 2 adjacent to the corresponding shoe 7.
  • the circumferential width of the hooks 14 and 16 must be less than the width of an axial housing 3 in line with the grooves 15 and 17 to allow the mounting of the stage vanes 1 as explained below.
  • the rear wall 11 of the shoe 7 is extended in the direction of the circumference of the disc 5 by at least one cleat 18 which at least partially closes the rear end of a mounting housing 3 adjacent to said shoe 7
  • a stopper 18 is provided on each side of the shoe 7.
  • the shoe 7 also has on its front face a locking tab 19 which extends towards the axis of the turbomachine and which is spaced from the front face. 10 of the disc 5. This locking tab 19 cooperates with an additional groove 20.
  • An annular segment 21 is interposed between the front face 10 of the disc 5 and all of the locking tabs 19 of the shoes 7.
  • the annular segment 21 covers the at least partially the front ends of the housings 3 for mounting the blades 2.
  • the annular segment 21 and the cleats 18 of the shoes 7 thus constitute the means of axial retention of the blades 2.
  • Each shoe 7 further has on the underside of its outer wall 6 a central partition 22 which extends parallel to the adjacent vanes 2 towards the periphery 4 of the disc 5.
  • This central partition 22 has in the vicinity of the outer wall 6 a slot 23 through which passes a spring leaf 24 provided at each of its ends with damper plates 25.
  • the assembly 26 constituted by the spring leaf 24 and damper plates 25 constitutes a vibration damper.
  • the leaf spring 24 is of curvilinear shape, so that, when the rotor 1 stops, the plates 25 are in the vicinity of the periphery 4 of the disc 5. The action of the centrifugal force will force the plates 25 to move away from the periphery 4 of the disk 5 against the bending force of the spring leaf 24. The plates 25 then come to bear on the adjacent vanes 2 thus promoting vibration damping.
  • Each shoe 7 also has additional walls 27 which extend from the underside of the external wall 6 perpendicular to the central partition 22 and which serve as a stop for the plates 25.
  • the shoe 7 is made of a composite material.
  • the vibration damper 25 can be produced by mounting the damper plates 25 on the spring leaf 24, but it can also be produced in one piece, in which case it will be put in place when the composite shoe is manufactured. .
  • the mounting of a blade 2 and a shoe 7 adjacent to the disc 5 is done as follows: the blade 2 is mounted in a housing 3 by sliding it in a direction parallel to the axis of this housing 3; the shoe 7 is mounted by positioning its base in the housing 3 adjacent to the already mounted blade 2, by sliding it in the plane of the disc 5, the two hooks 14 and 16 being introduced into the corresponding grooves 15 and 17, and by pressing it against the already mounted blade 2.
  • the annular segment 21 is rotated between the front face 10 of the disc 5 and the locking tabs 19 after each assembly of a blade-shoe pair. We continue this assembly operation until the last dawn 2.

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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)

Description

La présente invention concerne un rotor de type connu de soufflante ou de compresseur d'une turbomachine, du type comportant un disque de rotor, une série d'aubes radiales montées dans des logements axiaux réalisés dans la périphérie dudit disque, une série de sabots disposés entre lesdites aubes afin de maintenir l'écartement entre lesdites aubes et de constituer le profil interne de la veine annulaire de fluide circulant d'amont en aval dudit étage, des moyens de fixation desdits sabots sur ledit disque chacun desdits sabots présentant une paroi externe délimitant le profil interne de la veine et éloignée de la périphérie dudit disque, les extrémités axiales de ladite paroi externe étant situées sensiblement dans les plans des faces avant et arrière dudit disque.The present invention relates to a rotor of known type of fan or compressor of a turbomachine, of the type comprising a rotor disc, a series of radial blades mounted in axial housings produced in the periphery of said disc, a series of shoes arranged between said vanes in order to maintain the spacing between said vanes and to constitute the internal profile of the annular stream of fluid circulating from upstream to downstream of said stage, means for fixing said shoes on said disc each of said shoes having an outer wall defining the internal profile of the vein and distant from the periphery of said disc, the axial ends of said external wall being located substantially in the planes of the front and rear faces of said disc.

Ce type de rotor de turbomachine est particulièrement utilisé dans les étages de grand diamètre, car il est impératif, d'une part, de limiter le diamètre du disque portant les aubes à cause de la force centrifuge considérable obtenues aux grandes vitesses de rotation de la turbomachine, et, d'autre part, d'augmenter le diamètre interne de la veine annulaire de fluide circulant d'amont en aval de l'étage pour avoir une vitesse d'écoulement de fluide sensiblement uniforme dans toute la section de la veine.This type of turbomachine rotor is particularly used in large diameter stages, because it is imperative, on the one hand, to limit the diameter of the disc carrying the blades because of the considerable centrifugal force obtained at the high rotational speeds of the turbomachine, and, on the other hand, to increase the internal diameter of the annular stream of fluid flowing upstream downstream of the stage so as to have a substantially uniform fluid flow speed throughout the cross section of the stream.

Dans le cas d'aubes de petite dimension il est courant d'utiliser des aubes avec plates-formes. Mais lorsque les aubes sont de grande dimension cette façon de faire n'est pas souhaitable car elle entraîne une augmentation substantielle du poids des pieds d'aube.In the case of small blades it is common to use blades with platforms. But when the blades are large this way of doing things is undesirable since it results in a substantial increase in the weight of the blade roots.

Le document britannique GB-2 006 883 en particulier montre un rotor pour un étage de turbomachine du type mentionné ci-dessus. Le sabot décrit dans ce document comporte, à l'arrière, un crochet dirigé vers le haut qui coopère avec une rainure prévue en correspondance dans un premier anneau de retenue fixé par un dispositif à baïonnette sur la face arrière du disque, et il comporte, à l'avant, une nervure qui s'étend vers l'axe du disque et qui coopère avec la face avant du disque pour empêcher le déplacement axial du sabot vers l'arrière. Un deuxième anneau de retenue, fixé par boulonnage, est prévu sur la face avant du disque pour relier l'extrémité avant du sabot avec ledit disque.The British document GB-2 006 883 in particular shows a rotor for a turbomachine stage of the type mentioned above. The shoe described in this document comprises, at the rear, a hook directed upwards which cooperates with a groove provided in correspondence in a first retaining ring fixed by a bayonet device on the rear face of the disc, and it comprises, at the front, a rib which extends towards the axis of the disc and which cooperates with the front face of the disc to prevent the axial displacement of the shoe towards the back. A second retaining ring, fixed by bolting, is provided on the front face of the disc to connect the front end of the shoe with said disc.

Dans ce mode de construction et de fixation il est nécessaire que le sabot présente une paroi interne qui n'est que partiellement en appui sur le pourtour du disque de manière à pouvoir engager le crochet arrière dans la rainure correspondante du premier anneau de retenue par pivotement du sabot sur la périphérie du disque. Ceci se traduit par une configuration complexe du sabot et une augmentation de poids. De plus le dispositif à baïonnette servant à fixer le premier anneau de retenue sur la face arrière du disque demande un usinage délicat du disque et de cet anneau.In this method of construction and attachment, the shoe must have an internal wall which is only partially supported on the periphery of the disc so as to be able to engage the rear hook in the corresponding groove of the first retaining ring by pivoting. shoe on the periphery of the disc. This results in a complex configuration of the hoof and an increase in weight. In addition, the bayonet device used to fix the first retaining ring on the rear face of the disc requires delicate machining of the disc and of this ring.

Par ailleurs, le FR-A 1 134 548 montre un dispositif dans lequel chacun des sabots comporte une paroi avant et une paroi arrière qui s'étendent radialement vers l'axe de la turbomachine à partir desdites extrémités axiales de paroi externe de manière à recouvrir au moins partiellement les faces avant et arrière dudit disque et, dans lequel les moyens de fixation desdits sabots sur ledit disque comportent, pour chacun desdits sabots, au moins un crochet avant s'étendant axialement vers l'arrière à partir de sa paroi avant et au moins un crochet arrière qui s'étend vers l'avant à partir de sa paroi arrière, et des gorges ménagées dans ledit disque en correspondance avec lesdits crochets, lesdites gorges s'étendant entre les extrémités des logements de montage des deux aubes adjacentes audit sabot, lesdites gorges et lesdits crochets étant conformés et dimensionnés pour que ledit sabot puisse être monté par présentation au droit d'un logement de montage et glissement dudit sabot dans le plan du disque.Furthermore, FR-A 1 134 548 shows a device in which each of the shoes has a front wall and a rear wall which extend radially towards the axis of the turbomachine from said axial ends of the external wall so as to cover at least partially the front and rear faces of said disc and, in which the means for fixing said shoes to said disc comprise, for each of said shoes, at least one front hook extending axially rearwards from its front wall and at least one rear hook which extends forward from its rear wall, and grooves formed in said disc in correspondence with said hooks, said grooves extending between the ends of the mounting housings of the two blades adjacent to said shoe, said grooves and said hooks being shaped and dimensioned so that said shoe can be mounted by presentation to the right of a mounting housing and sliding of said shoe in the plane of the disc.

Les gorges et les crochets coopèrent entre eux pour retenir radialement le sabot lors de la rotation du disque. Les parois avant et arrière du sabot coopèrent avec le disque pour retenir axialement le sabot vers l'avant et vers l'arrière. Les gorges ont une forme de préférence circulaire dont le centre se trouve sur l'axe de la turbomachine. Mais ceci n'est pas obligatoire. Leur forme doit permettre le montage du sabot en faisant glisser ce dernier dans le plan du disque.The grooves and the hooks cooperate with one another to retain the shoe radially during the rotation of the disc. The front and rear walls of the shoe cooperate with the disc to axially retain the shoe forwards and backwards. The grooves are preferably circular in shape, the center of which is on the axis of the turbomachine. But this is not compulsory. Their shape must allow the mounting of the shoe by sliding it in the plane of the disc.

Le montage des sabots se fait ainsi sans boulonnage. Le dispositif à baïonnette de l'art antérieur est supprimé et l'usinage du disque de rotor est simplifié.The mounting of the shoes is thus done without bolting. The bayonet device of the prior art is eliminated and the machining of the rotor disc is simplified.

Conformément à l'invention, chaque sabot présente au moins un taquet qui s'étend à partir de sa paroi arrière pour venir recouvrir au moins partiellement un logement de montage adjacent audit sabot et présente une patte de verrouillage s'étendant radialement vers l'axe de la turbomachine à partir de sa paroi avant, ladite patte de verrouillage étant espacée de la face avant dudit disque et coopérant avec une gorge supplémentaire du disque, des moyens de rétention axiale des aubes dans leurs logements respectif étant prévus, les moyens de rétention axiale de ladite série d'aubes étant consistués, en amont dudit étage, par lesdits taquets et, en aval dudit étage, par un segment annulaire interposé entre la face avant dudit disque et lesdites pattes de verrouillage.According to the invention, each shoe has at least one cleat which extends from its rear wall to at least partially cover a mounting housing adjacent to said shoe and has a locking tab extending radially towards the axis of the turbomachine from its front wall, said locking tab being spaced from the front face of said disc and cooperating with an additional groove of the disc, means of axial retention of the blades in their respective housings being provided, the means of axial retention of said series of blades being formed, upstream of said stage, by said tabs and, downstream of said stage, by an annular segment interposed between the front face of said disc and said locking tabs.

Avantageusement, chaque sabot présente de plus une cloison médiane qui s'étend à partir de sa paroi externe vers la périphérie du disque et est sensiblement parallèle au plan des aubes adjacentes, ladite cloison présentant une fente au voisinage de ladite paroi externe, et il est équipé d'un amortisseur de vibrations formé d'une lame de ressort passant par ladite fente et de plaquettes d'amortissement prévues aux extrémités de ladite lame de ressort.Advantageously, each shoe also has a central partition which extends from its external wall towards the periphery of the disc and is substantially parallel to the plane of the adjacent blades, said partition having a slot in the vicinity of said external wall, and it is equipped with a vibration damper formed by a spring leaf passing through said slot and damping plates provided at the ends of said spring leaf.

Avantageusement chaque sabot comporte de plus des parois supplémentaires s'étendant à partir de la face inférieure de la paroi externe et servant de butée pour plaquettes d'amortisseur.Advantageously, each shoe also has additional walls extending from the underside of the external wall and serving as a stop for shock absorber pads.

D'autres caractéristiques et avantages de l'invention ressortiront à la lecture de la description suivante faite à titre d'exemple et en référence au dessin annexé dans lequel :

  • la figure 1 est une coupe du rotor d'un étage d'aubes de turbomachine selon un plan passant par l'axe de la turbomachine et équidistant de deux aubes adjacentes,
  • la figure 2 est une coupe selon un plan perpendiculaire à l'axe de la turbomachine et selon la ligne II-II de la figure 1,
  • la figure 3 est une vue de dessous et en perspective d'un sabot équipé d'un dispositif amortisseur de vibrations,
  • la figure 4 est une vue de dessus et en perspective d'un sabot,
  • la figure 5 est une vue en perspective d'un dispositif amortisseur de vibrations,
  • la figure 6 est une vue latérale du rotor, montrant le montage de la dernière aube, et
  • la figure 7 est une vue frontale du rotor avant le montage de la dernière aube.
Other characteristics and advantages of the invention will emerge on reading the following description given by way of example and with reference to the appended drawing in which:
  • FIG. 1 is a section through the rotor of a stage of turbomachine blades along a plane passing through the axis of the turbomachine and equidistant from two adjacent blades,
  • FIG. 2 is a section along a plane perpendicular to the axis of the turbomachine and along line II-II of FIG. 1,
  • FIG. 3 is a view from below and in perspective of a shoe fitted with a vibration damping device,
  • FIG. 4 is a view from above and in perspective of a shoe,
  • FIG. 5 is a perspective view of a vibration damping device,
  • FIG. 6 is a side view of the rotor, showing the mounting of the last blade, and
  • Figure 7 is a front view of the rotor before mounting the last blade.

Le dessin montre un rotor 1 d'un étage d'une turbomachine, dans lequel les aubes 2 sont fixées dans des logements axiaux 3 prévus sur la périphérie 4 d'un disque 5. Les aubes 2 sont du type sans plate-forme. Le profil interne de la veine de fluide circulant d'amont en aval de l'étage d'aubes est obtenu par la paroi externe 6 de sabots 7 disposés entre les aubes 2 et fixés au disque 5. Chaque sabot 7 maintient de plus l'écartement entre deux aubes adjacentes 2.The drawing shows a rotor 1 of a stage of a turbomachine, in which the blades 2 are fixed in axial housings 3 provided on the periphery 4 of a disc 5. The blades 2 are of the type without platform. The internal profile of the stream of fluid flowing upstream downstream of the blade stage is obtained by the external wall 6 of shoes 7 arranged between the blades 2 and fixed to the disc 5. Each shoe 7 further maintains the spacing between two adjacent blades 2.

Chaque sabot 7 présente une paroi avant 8 qui s'étend radialement vers l'axe de la turbomachine à partir de l'extrémité avant 9 de la paroi externe 6 et qui vient recouvrir au moins partiellement la face avant 10 du disque 5. Il présente de plus une paroi arrière 11 qui s'étend radialement vers l'axe de la turbomachine à partir de l'extrémité arrière 12 de la paroi externe 6 et qui vient recouvrir au moins partiellement la face arrière 13 du disque 5.Each shoe 7 has a front wall 8 which extends radially towards the axis of the turbomachine from the front end 9 of the external wall 6 and which at least partially covers the front face 10 of the disc 5. It has in addition, a rear wall 11 which extends radially towards the axis of the turbomachine from the rear end 12 of the external wall 6 and which at least partially covers the rear face 13 of the disc 5.

Les portions des parois avant 8 et arrière 11 qui recouvrent les faces avant 10 et arrière 13 du disque 5 présentent chacune au moins un crochet qui s'étend axialement vers le disque 5 et coopère avec une gorge formée en correspondance dans la paroi du disque 5. La paroi avant 8 comporte ainsi au moins un crochet avant 14 qui s'étend vers l'arrière et coopère avec la gorge 15, et la paroi arrière 11 présente au moins un crochet 16 qui s'étend vers l'avant et coopère avec la gorge 17. Les gorges avant 15 et arrière 17 du disque 5 s'étendent entre les logements axiaux 3 servant au montage des deux aubes 2 voisines du sabot correspondant 7. La largeur circonférentielle des crochets 14 et 16 doit être inférieure à la largeur d'un logement axial 3 au droit des gorges 15 et 17 pour permettre le montage de l'étage d'aubes 1 comme cela est expliqué plus loin.The portions of the front 8 and rear 11 walls which cover the front 10 and rear 13 faces of the disc 5 have each at least one hook which extends axially towards the disc 5 and cooperates with a groove formed in correspondence in the wall of the disc 5. The front wall 8 thus comprises at least one front hook 14 which extends towards the rear and cooperates with the groove 15, and the rear wall 11 has at least one hook 16 which extends forward and cooperates with the groove 17. The front grooves 15 and rear 17 of the disc 5 extend between the axial housings 3 used for mounting the two blades 2 adjacent to the corresponding shoe 7. The circumferential width of the hooks 14 and 16 must be less than the width of an axial housing 3 in line with the grooves 15 and 17 to allow the mounting of the stage vanes 1 as explained below.

Selon l'invention, la paroi arrière 11 du sabot 7 est prolongee dans le sens de la circonférence du disque 5 par au moins un taquet 18 qui vient obturer au moins partiellement l'extrémité arrière d'un logement de montage 3 adjacent audit sabot 7. De préférence il est prévu un taquet 18 de chaque côté du sabot 7. Le sabot 7 présente de plus sur sa face avant une patte de verrouillage 19 qui s'étend vers l'axe de la turbomachine et qui est écartée de la face avant 10 du disque 5. Cette patte de verrouillage 19 coopère avec une gorge supplémentaire 20. Un segment annulaire 21 est interposé entre la face avant 10 du disque 5 et l'ensemble des pattes de verrouillage 19 des sabots 7. Le segment annulaire 21 recouvre au moins partiellement les extrémités avant des logements 3 de montage des aubes 2. Le segment annulaire 21 et les taquets 18 des sabots 7 constituent ainsi les moyens de rétention axiale des aubes 2.According to the invention, the rear wall 11 of the shoe 7 is extended in the direction of the circumference of the disc 5 by at least one cleat 18 which at least partially closes the rear end of a mounting housing 3 adjacent to said shoe 7 Preferably, a stopper 18 is provided on each side of the shoe 7. The shoe 7 also has on its front face a locking tab 19 which extends towards the axis of the turbomachine and which is spaced from the front face. 10 of the disc 5. This locking tab 19 cooperates with an additional groove 20. An annular segment 21 is interposed between the front face 10 of the disc 5 and all of the locking tabs 19 of the shoes 7. The annular segment 21 covers the at least partially the front ends of the housings 3 for mounting the blades 2. The annular segment 21 and the cleats 18 of the shoes 7 thus constitute the means of axial retention of the blades 2.

Chaque sabot 7 présente de plus sur la face inférieure de sa paroi externe 6 une cloison médiane 22 qui s'étend parallèlement aux aubes adjacentes 2 vers la périphérie 4 du disque 5. Cette cloison médiane 22 présente au voisinage de la paroi externe 6 une fente 23 dans laquelle passe une lame de ressort 24 munie à chacune de ses extrémités de plaquettes d'amortisseur 25. L'ensemble 26 constitué par la lame de ressort 24 et des plaquettes d'amortisseur 25 constitue un amortisseur de vibrations. La lame de ressort 24 est de forme curviligne, de telle manière que, à l'arrêt du rotor 1, les plaquettes 25 se trouvent au voisinage de la périphérie 4 du disque 5. L'action de la force centrifuge forcera les plaquettes 25 à s'éloigner de la périphérie 4 du disque 5 à l'encontre de la force de flexion de la lame à ressort 24. Les plaquettes 25 viennent alors s'appuyer sur les aubes adjacentes 2 favorisant ainsi l'amortissement vibratoire. Chaque sabot 7 présente de plus des parois supplémentaires 27 qui s'étendent à partir de la face inférieure de la paroi externe 6 perpendiculairement à la cloison médiane 22 et qui servent de butée aux plaquettes 25.Each shoe 7 further has on the underside of its outer wall 6 a central partition 22 which extends parallel to the adjacent vanes 2 towards the periphery 4 of the disc 5. This central partition 22 has in the vicinity of the outer wall 6 a slot 23 through which passes a spring leaf 24 provided at each of its ends with damper plates 25. The assembly 26 constituted by the spring leaf 24 and damper plates 25 constitutes a vibration damper. The leaf spring 24 is of curvilinear shape, so that, when the rotor 1 stops, the plates 25 are in the vicinity of the periphery 4 of the disc 5. The action of the centrifugal force will force the plates 25 to move away from the periphery 4 of the disk 5 against the bending force of the spring leaf 24. The plates 25 then come to bear on the adjacent vanes 2 thus promoting vibration damping. Each shoe 7 also has additional walls 27 which extend from the underside of the external wall 6 perpendicular to the central partition 22 and which serve as a stop for the plates 25.

Le sabot 7 est réalisé dans un matériau composite. L'amortisseur de vibrations 25 peut être réalisé par montage des plaquettes d'amortisseur 25 sur la lame de ressort 24, mais il peut également être réalisé en une seule pièce auquel cas il sera mis en place au moment de la fabrication du sabot en composite.The shoe 7 is made of a composite material. The vibration damper 25 can be produced by mounting the damper plates 25 on the spring leaf 24, but it can also be produced in one piece, in which case it will be put in place when the composite shoe is manufactured. .

Le montage d'une aube 2 et d'un sabot 7 adjacent sur le disque 5 se fait de la façon suivante :
   l'aube 2 est montée dans un logement 3 en la faisant glisser selon une direction parallèle à l'axe de ce logement 3 ; le sabot 7 est monté en positionnant sa base dans le logement 3 voisin de l'aube 2 déjà montée, en le faisant glisser dans le plan du disque 5, les deux crochets 14 et 16 s'introduisant dans les gorges correspondantes 15 et 17, et en le plaquant contre l'aube 2 déjà montée. On fait tourner le segment annulaire 21 entre la face avant 10 du disque 5 et les pattes de verrouillage 19 après chaque montage d'un couple aube-sabot. On continue cette opération de montage jusqu'à la dernière aube 2.The mounting of a blade 2 and a shoe 7 adjacent to the disc 5 is done as follows:
the blade 2 is mounted in a housing 3 by sliding it in a direction parallel to the axis of this housing 3; the shoe 7 is mounted by positioning its base in the housing 3 adjacent to the already mounted blade 2, by sliding it in the plane of the disc 5, the two hooks 14 and 16 being introduced into the corresponding grooves 15 and 17, and by pressing it against the already mounted blade 2. The annular segment 21 is rotated between the front face 10 of the disc 5 and the locking tabs 19 after each assembly of a blade-shoe pair. We continue this assembly operation until the last dawn 2.

Pour monter la dernière aube 2', on procède comme représenté sur les figures 6 et 7. On positionne d'abord les deux sabots 7' et 7'' voisins du logement 3' de ta dernière aube, après avoir pris soin de faire passer l'extrémité 27 du segment annulaire 21 au-dessus des taquets de verrouillage 19 correspondants pour permettre le dégagement de l'extrémité avant du logement axial 3', puis on glisse le pied de l'aube 2', dans le logement 3'. Les taquets 18 voisins des deux sabots 7' et 7'' sont évidemment dimensionnés pour qu'il soit possible de présenter le dernier sabot 7'' dans le logement 3' lorsque le sabot 7' est correctement positionné. Ensuite on fait tourner le segment annulaire 21 dans le sens approprié pour que son extrémité 27 soit interposée entre le disque 5 et les taquets de verrouillage 19.To mount the last dawn 2 ', proceed as shown in Figures 6 and 7. First position the two shoes 7' and 7 '' neighbors of the housing 3 'of your last dawn, after taking care to pass the end 27 of the annular segment 21 above the corresponding locking tabs 19 to allow the front end of the axial housing 3 ′ to be released, then the foot of the blade 2 ′ is slid into the housing 3 ′. The cleats 18 adjacent to the two shoes 7 'and 7''are obviously dimensioned so that it is possible to present the last shoe 7 '' in the housing 3 'when the shoe 7' is correctly positioned. Then the annular segment 21 is rotated in the appropriate direction so that its end 27 is interposed between the disc 5 and the locking tabs 19.

Claims (3)

  1. Rotor for a fan or compressor stage of a turbomachine, of the type including a rotor disc (5), a series of radial blades (2) fitted into axial housings (3) produced in the periphery (4) of the said disc (5), a series of shoes (7) located between the said blades (2) in order to maintain the separation between the said blades (2) and to constitute the internal profile of the stream of fluid running from upstream to downstream of the said stage, means for fixing the said shoes (7) to the said disc (5), each of the said shoes (7) exhibiting an external wall (6) delimiting the internal profile of the stream and remote from the periphery (4) of the said disc (5), the axial ends (9, 12) of the said shoes (7) being situated substantially and respectively in the planes of the front (10) and rear (13) faces of the said disc (5), each of the said shoes (7) including a front wall (8) and a rear wall (11) which extend radially towards the axis of the turbomachine from the said axial ends (9, 12) of the external wall so as to overlap the front (10) and rear (13) faces of the said disc, at least partially, the means for fixing the said shoes (7) to the said disc (5) including, for each of the said shoes (7), at least one front hook (14) extending axially towards the rear from its front wall (8), at least one rear hook (16) extending axially towards the front from its rear wall (11), and grooves (15, 17) formed in the said disc (5) in correspondence with the said hooks (14, 16), the said grooves (15, 17) extending between the ends of the housings (3) for fitting the two blades (2) adjacent to the said shoe (7), the said grooves (15, 17) and the said hooks (14, 16) being shaped and dimensioned so that the said shoe (7) can be fitted by offering the said shoe (7) up in line with a fitting housing (3) and sliding it in the plane of the said disc (5), characterized in that each shoe (7) exhibits at least one cleat (18) which extends from its rear wall (11) and at least partially overlaps a fitting housing (3) adjacent to the said shoe (7), and a locking tab (19) extending radially towards the axis of the turbomachine from its front wall (8), the said locking tab (19) being separated from the front face (10) of the said disc (5) and interacting with an additional groove (20) of the disc (5), and in that means for axially retaining the blades (2) in their respective housings (3) are provided and in that the means for axial retention of the said series of blades (2) are made up, upstream of the said stage, of the said cleats (18) and, downstream of the said stage, of an annular segment (21) interposed between the front face (10) of the said disc (5) and the said locking tabs (19).
  2. Rotor according to Claim 1, characterized in that each shoe (7) furthermore exhibits a middle partition (22) which extends from its external wall (6) towards the periphery (4) of the disc (5) and is substantially parallel to the plane of the adjacent blades (2), the said partition (22) exhibiting a slit (23) in the vicinity of the said external wall (6), and in that it is equipped with a vibration damper (26) formed of a leafspring (24) passing through the said slit (23) and of damper plates (25) provided at the ends of the said leafspring (24).
  3. Rotor according to Claim 2, characterized in that each shoe (7) furthermore includes additional walls (27) extending from the lower face of its external wall (6) and acting as a limit stop for the damper plates (25).
EP91403182A 1990-11-28 1991-11-26 Fan rotor with blades without platforms and fillers reconstructing the streamline profile Expired - Lifetime EP0488874B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR909014850A FR2669686B1 (en) 1990-11-28 1990-11-28 BLOWER ROTOR WITH BLADES WITHOUT PLATFORMS AND SHOES RECONSTRUCTING THE VEIN PROFILE.
FR9014850 1990-11-28

Publications (2)

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EP0488874A1 EP0488874A1 (en) 1992-06-03
EP0488874B1 true EP0488874B1 (en) 1994-11-09

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EP91403182A Expired - Lifetime EP0488874B1 (en) 1990-11-28 1991-11-26 Fan rotor with blades without platforms and fillers reconstructing the streamline profile

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US (1) US5161949A (en)
EP (1) EP0488874B1 (en)
DE (1) DE69105099T2 (en)
FR (1) FR2669686B1 (en)

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Also Published As

Publication number Publication date
DE69105099D1 (en) 1994-12-15
EP0488874A1 (en) 1992-06-03
US5161949A (en) 1992-11-10
DE69105099T2 (en) 1995-04-20
FR2669686A1 (en) 1992-05-29
FR2669686B1 (en) 1994-09-02

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