EP2631490A1 - Radial-flow impeller with radially free base ring - Google Patents

Radial-flow impeller with radially free base ring Download PDF

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Publication number
EP2631490A1
EP2631490A1 EP13156150.8A EP13156150A EP2631490A1 EP 2631490 A1 EP2631490 A1 EP 2631490A1 EP 13156150 A EP13156150 A EP 13156150A EP 2631490 A1 EP2631490 A1 EP 2631490A1
Authority
EP
European Patent Office
Prior art keywords
hub
plate
base ring
impeller
radial
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
EP13156150.8A
Other languages
German (de)
French (fr)
Other versions
EP2631490B1 (en
Inventor
Sylvain GUILLEMIN
Vittorio Michelassi
Douglas Carl Hofer
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.)
Thermodyn SAS
Original Assignee
Thermodyn SAS
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Filing date
Publication date
Application filed by Thermodyn SAS filed Critical Thermodyn SAS
Publication of EP2631490A1 publication Critical patent/EP2631490A1/en
Application granted granted Critical
Publication of EP2631490B1 publication Critical patent/EP2631490B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F04D29/18—Rotors
    • F04D29/20—Mounting rotors on shafts
    • 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
    • F01D5/02—Blade-carrying members, e.g. rotors
    • F01D5/04—Blade-carrying members, e.g. rotors for radial-flow machines or engines
    • 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
    • F01D5/30—Fixing blades to rotors; Blade roots ; Blade spacers
    • F01D5/3069—Fixing blades to rotors; Blade roots ; Blade spacers between two discs or rings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
    • F01D5/34—Rotor-blade aggregates of unitary construction, e.g. formed of sheet laminae
    • 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
    • F04D29/02—Selection of particular materials
    • F04D29/023—Selection of particular materials especially adapted for elastic fluid pumps
    • 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
    • F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/284—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for compressors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/60—Mounting; Assembling; Disassembling
    • F04D29/62—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps
    • F04D29/624—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • 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
    • F05D2230/642—Assembly methods using positioning or alignment devices for aligning or centring, e.g. pins using maintaining alignment while permitting differential dilatation

Definitions

  • the invention relates to compression impellers or impeller wheels, intended for the mechanical compression of a gas and relates more particularly to the attachment of impeller wheels on a rotary shaft of a compressor.
  • a compressor impeller conventionally comprises a hub through which the impeller attaches to the compressor shaft and a base rim, from which the blades radially extend, bonded to the hub.
  • a compressor impeller is hot-shrunk on the rotary shaft of the compressor.
  • the tightening is then calculated to be sufficient in all cases to absorb, at full speed, all forces applied to the wheel they are aerodynamic, due to the thrust, or torque transmitted.
  • a paddle wheel intended to be mounted on a rotary shaft comprising a base ring provided with vanes projecting from one face of the base ring, and an annular hub adapted to be coupled to the ring gear. basic and rotary shaft.
  • the impeller comprises an annular plate, and the hub, the plate and the base ring are configured to cooperate together so as to maintain the base ring axially and to maintain a freedom of movement. radial deformation of the base ring relative to the hub and the plate.
  • the mechanical fasteners consisting of the plate and the hub, and the base ring can thus have large differential expansions.
  • the hub and the plate being assembled with the base ring so as to maintain freedom of radial deformation of the base ring relative to the hub and the plate, the base ring can expand radially regardless of the expansion of the hub and plate, that is to say that the expansion of the base ring may be different from the expansion of the plate and the hub. It is thus possible to use different materials between the base ring and the mechanical fasteners. It is in particular possible to use high performance materials for the basic crown which can not generally be mounted on the shaft while the fasteners, ie the hub and the plate, are made of materials that can be shrunk onto the rotating shaft.
  • the base ring comprises a circular key on its inner perimeter adapted to cooperate with a first notch made in the hub and a second notch made in the plate, the first and the second notch being arranged facing one of the other so that the circular key of the base ring is retained in the notches when the hub, the plate and the base ring are assembled.
  • the circular key, the first notch and the second notch are dimensioned so that, on the one hand, the circular key is held axially without freedom of axial displacement and thus ensure the centering of the base ring axially, and, that on the other hand, the circular key can move radially in a space defined by the notches in particular when the base ring expands.
  • the radial dimensions of the first and second notches preferably have larger dimensions than the radial dimensions of the circular key, and the axial dimensions of the circular key are equal to the axial space. defined by the first and second notches when the hub and the plate are assembled.
  • the circular key may comprise two outer O-rings respectively disposed on either side of the base ring on the outer radial surface of the circular key, and two internal O-rings respectively disposed on either side of the ring. base on the inner radial surface of the circular key.
  • the two inner O-rings provide a radial centering of the base ring cold, that is to say while the paddle wheel is stopped, thanks to its internal diameter.
  • the two outer O-rings make it possible to maintain the centering of the base ring when the impeller is rotated, causing the base ring to expand more than the expansion of the fasteners, ie say plateau and hub. Radial centering is maintained by the natural deformation of the inner and outer O-rings as the rotating shaft rotates. At full rotational speed, the centering of the basic crown is preserved thanks to the outer diameter of the circular key.
  • the circular key may comprise a single inner O-ring disposed on the inner surface of the circular key centrally.
  • the use of two internal O-rings allows a better balancing.
  • the impeller may advantageously comprise radial guiding means capable of limiting the friction between the base ring and the hub, and between the base ring and the plate during the radial deformation of the base ring.
  • Friction between the base ring and the hub can cause degradation of the mechanical fasteners and / or the base ring. Indeed, the friction can cause the appearance of cracks in the base ring and / or in the plate and / or the hub.
  • the radial guide means comprise on each of the axial faces of the base ring at least one circular groove disposed in the circular key, the circular grooves each comprising an O-ring or rolling means.
  • the circular key thus comprises at least one groove facing the first notch made in the hub and at least one groove facing the second notch made in the plate.
  • the rolling means such as balls, rollers, or rollers for example, or the O-rings are inserted in the circular grooves and are dimensioned so that, on the axial faces of the base ring, the key circular is not in direct contact with the tray on one side and with the hub on the other side.
  • the second notch made in the plate comprises an oblique outer radial contact surface
  • the outer radial surface of the key comprises a corresponding oblique portion facing the oblique outer radial contact surface of the plate
  • the plate is assembled. with the hub so as to be deformable and deviate from the hub on a radial distal portion during the radial deformation of the base ring.
  • the circular key exerts a radial force on the plate and in particular on the oblique outer radial contact surface.
  • the force thus applied by the circular key on the oblique outer radial contact surface results, thanks to the flexibility of the plate and in particular of its distal portion, the spacing of the plate relative to the hub and therefore an increase in the space between the two notches.
  • the point of support between the outer radial surface of the circular key and the oblique outer radial contact surface of the plate then moves allowing both the radial expansion of the crown and the application of an axial holding force by the distal portion of the plate on the circular key to the hub, which maintains the centering of the base ring.
  • the plate may comprise centering means and the hub may comprise complementary centering means capable of cooperating with the centering means.
  • the centering means and the complementary centering means thus make it possible to assemble the hub and the plate in a radially centered manner, that is to say with respect to the axis of rotation of the impeller, and thus to obtain a uniform axial holding force applied to the base ring for axial centering of the base ring.
  • the centering means may advantageously comprise a centering ring fixed on the plate and having a toothing facing the hub, and the complementary centering means comprise a complementary centering ring fixed on the hub and having a complementary toothing facing the plate suitable for to cooperate with the toothing of the centering ring.
  • the centering ring and the complementary centering ring may correspond to an axial gear such as a Hirth ® type toothing.
  • the centering means may comprise a proximal portion of the plate projecting conically facing the hub and having the axis of the rotary shaft, and the complementary centering means comprise in the hub a conical recess facing the plate having axis the rotary shaft, the tapered projecting portion and the conical recess being adapted to cooperate during assembly of the plate with the hub.
  • the transmission of the torque between the shaft and the plate can be achieved by friction between the conically projecting portion. of the plate and the conical recess of the hub, or by the use of a pin or a key between the hub and the plate.
  • the hub may be disposed on a first shaft portion and the plate may be disposed on a second shaft portion, the first shaft portion and the second shaft portion being secured by fastening means so as to secure the hub and the plate.
  • the first shaft portion may thus comprise a threaded orifice along the axis of rotation of the shaft on the end facing the second shaft portion, and the second shaft portion may comprise on the end piece. view of the first shaft portion a screw whose thread corresponds to the thread of the orifice of the first shaft portion.
  • the impeller may also include a bolted fastening flange adapted to secure the plate with the hub.
  • the fixing flange may for example be through in the plate and threaded in the hub so as to fix a screw in the hub through the plate, with the head of the screw resting on one side of the plate.
  • the impeller comprises a flange coupled to the base ring via the blades, the flange and the base ring having an identical mass.
  • the hub may be shrunk or integrated on at least a portion of the rotary shaft of the compressor.
  • the tray can also be shrunk or integrated on at least a portion of the rotary shaft of the compressor.
  • a motor-compressor unit comprising a motor, a compressor and a compressible gas-tight common housing in which are mounted the engine and the compressor, the compressor comprising at least a paddle wheel as defined above.
  • FIG. 1 there is shown an example of a compressor unit provided with impeller wheels made according to the invention.
  • the motorcycle compressor group illustrated on the figure 1 essentially comprises a motor 1, constituted for example by a variable speed electric motor driving a rotor 2 in rotation, itself driving at identical speed a rotary shaft 3 on which is mounted a paddle wheel 4.
  • the motor-compressor unit here comprises a single compression stage constituted by radial vane wheels 4 which ensures the suction of a gas delivered from an inlet pipe 5 to cause an increase in its pressure and deliver it at the exit 5 '.
  • the rotor 2 is supported by two end bearings 6 and 7.
  • the rotary shaft 3 which is also supported by two end bearings 8 and 9.
  • the rotor 2 and the rotary shaft 3 are connected by a flexible coupling 10.
  • the rotor and the rotary shaft could also be connected by a fixed coupling.
  • one of the bearings, such as 7 and 8, could be omitted.
  • the assembly that is to say the engine 1 and the compression stage is disposed in a gas-tight common housing 11 handled by the compressor.
  • the engine 1 is here at the suction pressure of the motor-compressor unit.
  • FIGS. 2a and 2b respectively show an exploded view and an assembled view of a first example of paddle wheels according to one embodiment of the invention, which can be mounted in the compressor unit of the figure 1 .
  • the impeller 4 comprises three distinct parts: a base ring 12, a hub 13, a plate 14.
  • the base ring 12 comprises a distal portion 12a and a proximal portion 12b relative to its axis of rotation coincides with the axis of rotation of the rotary shaft 3.
  • the base ring 12 extends in a plane orthogonal to its axis of rotation and comprises a first face 12f and a face opposite the 12o.
  • the base ring 12 has, mainly on its distal portion 12a, blades 15 projecting on the first face 12f of the base ring 12 opposite a flange 16.
  • the flange 16 comprises a distal portion 16a and a proximal portion 16b with respect to its axis of rotation coincides with the axis of rotation of the rotary shaft 3.
  • the distal portion 16a of the flange 16 is disposed parallel to the distal portion 12a of the base ring 12 and is coupled to the vanes 15 on a face 16f opposite the base ring 12.
  • the flange 16 and the base ring 12 have a similar mass so as to obtain an almost symmetrical centrifugal force on either side of the connection with the blades 15.
  • the stresses in the base ring 12 are thus less important, and thus promotes a quasi-radial deformation of the base ring 12.
  • the base ring 12 has on its proximal portion 12b a circular key 17.
  • the circular key 17 is in particular arranged along the inner perimeter of the base ring 12.
  • the circular key 17 comprises in this example a section of generally square shape .
  • the hub 13 has an annular shape whose axis of rotation coincides with the axis of the rotary shaft 3.
  • the hub 13 has a bearing face 13f orthogonal to the axis of the rotary shaft 3 and intended to facing the plate 14, a distal portion 13a and a proximal portion 13b with respect to its axis of rotation.
  • the plate 14 also has an annular shape whose axis of rotation coincides with the axis of the rotary shaft 3.
  • the plate comprises a bearing face 14f orthogonal to the axis of the rotary shaft 3 and intended to be facing the hub 13, a distal portion 14a and a proximal portion 14b relative to its axis of rotation.
  • the hub 13 has on the distal portion 13a of its bearing face 13f a first notch 18 adapted to partially receive the circular key 17.
  • the plate has on the distal portion 14a of its bearing face 14f a second notch 19 fit to receive in part the circular key 17.
  • the first notch 18 and the second notch 19 are made to be facing each other with identical dimensions so that the second notch 19 is symmetrical to the first notch 19 relative to the axis defined by the bearing faces 13f and 14f when the hub and the plate are in contact.
  • the notches 18 and 19 may not be symmetrical with respect to the circular key 17, as long as the junction between the circular key 17 and the remainder of the base ring 12 is centered with respect to the base ring 12.
  • the notches 18 and 19 may thus comprise complementary shapes so as to axially hold the circular key 17 and to define a passage for the junction between the circular key 17 and the remainder of the crown. base 12, the junction being centered with respect to the circular key 17 and the remainder of the base ring 12.
  • the notches 18 and 19 are dimensioned so as to maintain the circular key 17 axially, that is to say to be in abutment with the circular key 17 in a direction parallel to the axis of rotation of the the basic crown 12.
  • the circular key 17 may comprise a section of shape different from the square shape, such as for example a hexagonal, octagonal shape, or any other shape adapted to cooperate with the first and second notches 18 and 19.
  • the radial dimensions of the notches 18 and 19 are larger than the dimension of the circular key 17 in a direction orthogonal to the axis of rotation of the base ring 12. This is so as to maintain a freedom of radial displacement of the circular key 17 especially when the base ring 12 is deformed with the speed of rotation.
  • the cold radial centering of the base ring 12, that is to say when the paddle wheel 4 is stopped or at low speed, is achieved thanks to the internal diameter of the circular key 17, while the centering of the base ring 12 at full speed is achieved through the outer diameter of the circular key, after the base ring has expanded.
  • the circular key 17 comprises an inner radial surface 17i oriented towards the axis of rotation of the base ring and an outer radial surface 17e opposite to the inner radial surface 17i.
  • the circular key 17 comprises on its outer radial surface 17e two outer O-rings 20.
  • the two outer O-rings 20 are respectively disposed on either side of the base ring 12, that is to say one of the side of the first face 12f of the base ring 12 and the other of the opposite side 12o.
  • the circular key 17 comprises on its inner radial surface 17i two internal O-rings 21 respectively disposed on either side of the base ring 12, that is to say symmetrically on both sides of the plane in which the base ring 12 extends.
  • the base ring 12 is centered radially thanks to the internal diameter of the circular key 17.
  • the base ring 12 can deform more rapidly than the hub 13 and the plate 14 which constitute the fastening elements. and this with slight restraints due to the frictional forces at the radial guide between the circular key 17 and the hub, on the one hand, and between the circular key 17 and the plate 14, on the other hand.
  • the centering is preserved thanks to the two outer O-rings 20 and the two inner O-rings 21 which deform naturally.
  • the plate and the hub are configured to allow the base ring to be centered thanks to the outer diameter of the circular key 17.
  • the base ring 12 reproduces the opposite deformation until it is again centered at low speed.
  • the hub 13 is integrated with a first shaft portion 4a and the plate 14 is integrated with a second shaft portion 3b.
  • the hub 13 and the plate 14 could also be shrunk respectively on the first and the second shaft portions 3a and 3b.
  • the assembly of the hub 13 with the plate 14 is made by screwing the second shaft portion 3b into the first shaft portion 3a, the first shaft portion 3a having a threaded orifice along its axis of rotation on a hub opposite the second shaft portion 3b, and the second shaft portion 3b having a tip opposite the first shaft portion 3a having a thread corresponding to the thread of the orifice of the first portion of tree 3a.
  • the centering of the hub 13 with the plate 14 is achieved by means of an axial gear, for example by means of a gear system. Hirth ® .
  • the plate 14 comprises a centering ring 22a fixed on the bearing face 14f of the plate 14.
  • the hub 13 comprises a complementary centering ring 22b fixed on the bearing face 13f of the hub 13.
  • the centering ring 21a cooperates with the complementary centering ring 21b for the radial centering, and thus radially match the first and second notches 18 and 19.
  • the circular key 17 ' comprises radial guiding means making it possible to avoid friction between the circular key 17' and the hub 13 on the one hand, and between the circular key 17 'and the plate 14 'somewhere else.
  • the radial guide means comprise on the first face 12f and the opposite face 12o of the base ring 12 at least one circular groove 23 disposed in the circular key 17 '.
  • Each circular groove 23 comprises rolling balls 24 for separating the circular key 17 'of the hub 13 on the one hand, and the circular key 17' of the plate 14 on the other hand.
  • This embodiment also differs from that shown in the Figures 2a and 2b from the centering means and the fixing means of the hub 13 with the plate 14.
  • the paddle wheel 4 illustrated on the figure 3 comprises as fastening means, a bolted fastening flange 24 adapted to secure the plate 14 with the hub 13.
  • the fastening flange 24 comprises a threaded hole 25 blind in the hub 13, the opening of the threaded hole 25 being disposed on the bearing flange 13f of the hub 13.
  • the fastening flange 24 also comprises a through hole 26 formed in the plate 14 facing the threaded hole 25.
  • the through orifice 26 comprises a stop 27 so that a screw 28 resting on the stop 27 can hold tight the plate 14 on the hub 13.
  • the plate 14 comprises a projecting portion 29 on its proximal portion 14b.
  • the projecting portion extends towards the hub 13 with a tapered shape with decreasing section.
  • the hub 13 comprises a complementary recess 30 made in its proximal portion 13b with a conical shape adapted to cooperate with the projecting portion 29 of the plate 14.
  • the impeller 4 may not comprise a bolted fastening flange 24, the transmission of the torque between the hub 13 and the plate 14 may be by friction between the protruding portion 29 and the surfaces of the flange 24.
  • the Figures 4a and 4b show a third example of impeller 4 according to one embodiment of the invention. Elements bearing the same references as on the Figures 2a and 2b are the same.
  • the figure 4a represents the third example of a paddle wheel 4 at a stop or at a slow rotational speed, while the figure 4b represents the third example of a paddle wheel 4 with a high rotational speed.
  • the second notch 19 made in the plate 14 comprises an outer radial contact surface 31 oblique so as to form an obtuse angle with the face of the notch 32 facing the hub 13.
  • the outer radial surface 17 “e of the circular key 17” comprises an oblique portion facing and parallel to the oblique outer radial contact surface 31 of the plate 14.
  • the plate 14 is secured to the hub 13 by means of a fastening flange 24.
  • the fastening flange 24 "is mounted on the plate 14 at the proximal portion 14b so that the plate 14 can be deformed. and move away from the hub 13 on a distal portion 14a during the radial deformation of the base ring 12.
  • the base ring 12 can thus deform radially, the circular key 17 "moving slightly radially away from its axis of rotation due to the deformation of the plate 14 , and more specifically of the distal portion 14a of the plate, the oblique portion of the outer radial surface 17 “e of the circular key 17” sliding along the outer radial contact surface 31 oblique.
  • the invention is not limited to these three different embodiments. It also includes all possible combinations between these embodiments.
  • the invention thus makes it possible to provide a blade wheel with a base ring having a freedom of radial deformation, and a possibility of using materials for the base ring that are not usable for the fasteners.
  • the plate 14 can be fixed by bolting on the hub 13 and thus constitute a separate element of the rotary shaft 3.
  • the circular key 17 is provided with a set of radial contact surfaces cooperating with corresponding oblique surfaces formed on the hub, on the one hand and on the plate, on the other hand. go.

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

Abstract

The impeller has a basic rim (12) provided with blades (15) protruding on a surface (12f) of the basic rim. An annular hub (13) is adapted to be coupled to the rim and to a rotary shaft (3). An annular plate (14) and the rim are configured to interact with each other. The rim comprises a circular key (17) on its inner perimeter for interacting with a notch (18) made in the hub and another notch (19) made in the plate. The notches are placed opposite to each other such that the circular key is held in the notches when the hub, the plate and the rim are assembled.

Description

L'invention concerne les roues à aubes de compression ou roues aubées, destinées à la compression mécanique d'un gaz et concerne plus particulièrement la fixation des roues à aubes sur un arbre rotatif d'un compresseur.The invention relates to compression impellers or impeller wheels, intended for the mechanical compression of a gas and relates more particularly to the attachment of impeller wheels on a rotary shaft of a compressor.

Une roue à aubes de compresseur comprend classiquement un moyeu par lequel la roue vient se fixer sur l'arbre du compresseur et une couronne de base, à partir de laquelle s'étendent radialement les aubes, liée au moyeu.A compressor impeller conventionally comprises a hub through which the impeller attaches to the compressor shaft and a base rim, from which the blades radially extend, bonded to the hub.

Généralement, une roue à aubes de compresseur est frettée à chaud sur l'arbre rotatif du compresseur. Le serrage est alors calculé afin d'être suffisant dans tous les cas de figure pour absorber, à pleine vitesse, tous les efforts appliqués sur la roue qu'ils soient aérodynamiques, dus à la poussée, ou au couple transmis.Generally, a compressor impeller is hot-shrunk on the rotary shaft of the compressor. The tightening is then calculated to be sufficient in all cases to absorb, at full speed, all forces applied to the wheel they are aerodynamic, due to the thrust, or torque transmitted.

Il est connu de prévoir des arrangements mécaniques utilisant des systèmes mécaniques flexibles de par leur forme et leur épaisseur notamment en ce qui concerne les moyeux pour absorber les efforts appliqués sur la roue mais, dans tous les cas, la couronne de base portant les aubes de la roue est fixée rigidement au moyeu déformable.It is known to provide mechanical arrangements using flexible mechanical systems in their shape and thickness, particularly with regard to the hubs to absorb the forces applied to the wheel, but in all cases, the base ring bearing the blades of the wheel is fixed rigidly to the deformable hub.

Au vu de ce qui précède, il est proposé de pallier les inconvénients des roues à aubes selon l'état de la technique en proposant une roue à aubes comportant une couronne de base libre de se déformer radialement par rapport au moyeu.In view of the above, it is proposed to overcome the disadvantages of paddle wheels according to the state of the art by proposing a paddle wheel having a base ring free to deform radially relative to the hub.

Selon un aspect, il est proposé une roue à aubes destinée à être montée sur un arbre rotatif comprenant une couronne de base pourvue d'aubes en saillie sur une face de la couronne de base, et un moyeu annulaire apte à être couplé à la couronne de base et à l'arbre rotatif.According to one aspect, there is provided a paddle wheel intended to be mounted on a rotary shaft comprising a base ring provided with vanes projecting from one face of the base ring, and an annular hub adapted to be coupled to the ring gear. basic and rotary shaft.

Selon une caractéristique générale, la roue à aubes comprend un plateau annulaire, et le moyeu, le plateau et la couronne de base sont configurés pour coopérer ensemble de manière à maintenir axialement la couronne de base et à conserver une liberté de déformation radiale de la couronne de base par rapport au moyeu et au plateau.According to a general characteristic, the impeller comprises an annular plate, and the hub, the plate and the base ring are configured to cooperate together so as to maintain the base ring axially and to maintain a freedom of movement. radial deformation of the base ring relative to the hub and the plate.

Les pièces de fixation mécanique, constituées du plateau et du moyeu, et la couronne de base peuvent ainsi posséder de grosses dilatations différentielles. En effet, le moyeu et le plateau étant assemblés avec la couronne de base de manière à conserver une liberté de déformation radiale de la couronne de base par rapport au moyeu et au plateau, la couronne de base peut se dilater radialement indépendamment de la dilatation du moyeu et du plateau, c'est-à-dire que la dilatation de la couronne de base peut être différente de la dilatation du plateau et du moyeu. Il est ainsi possible d'utiliser des matériaux différents entre la couronne de base et les pièces de fixation mécaniques. Il est notamment possible d'utiliser des matériaux hautes performances pour la couronne de base qui ne peuvent généralement pas être montés frettés sur l'arbre, tandis que les pièces de fixation, c'est-à-dire le moyeu et le plateau, sont réalisés dans des matériaux qui peuvent être frettés sur l'arbre rotatif.The mechanical fasteners, consisting of the plate and the hub, and the base ring can thus have large differential expansions. Indeed, the hub and the plate being assembled with the base ring so as to maintain freedom of radial deformation of the base ring relative to the hub and the plate, the base ring can expand radially regardless of the expansion of the hub and plate, that is to say that the expansion of the base ring may be different from the expansion of the plate and the hub. It is thus possible to use different materials between the base ring and the mechanical fasteners. It is in particular possible to use high performance materials for the basic crown which can not generally be mounted on the shaft while the fasteners, ie the hub and the plate, are made of materials that can be shrunk onto the rotating shaft.

De préférence, la couronne de base comprend une clavette circulaire sur son périmètre intérieur apte à coopérer avec une première encoche réalisée dans le moyeu et une seconde encoche réalisée dans le plateau, la première et la seconde encoche étant disposée en regard l'une de l'autre de sorte que la clavette circulaire de la couronne de base soit retenue dans les encoches lorsque le moyeu, le plateau et la couronne de base sont assemblés.Preferably, the base ring comprises a circular key on its inner perimeter adapted to cooperate with a first notch made in the hub and a second notch made in the plate, the first and the second notch being arranged facing one of the other so that the circular key of the base ring is retained in the notches when the hub, the plate and the base ring are assembled.

La clavette circulaire, la première encoche et la seconde encoche sont dimensionnées de sorte que, d'une part, la clavette circulaire soit maintenue axialement sans liberté de déplacement axial et ainsi assurer le centrage de la couronne de base axialement, et, que d'autre part, la clavette circulaire puisse se déplacer radialement dans un espace défini par les encoches notamment lorsque la couronne de base se dilate. Pour cela, les dimensions radiales des première et seconde encoches possèdent préférentiellement des dimensions plus grandes que les dimensions radiales de la clavette circulaire, et les dimensions axiales de la clavette circulaire sont égales à l'espace axial définit par la première et la seconde encoche lorsque le moyeu et le plateau sont assemblées.The circular key, the first notch and the second notch are dimensioned so that, on the one hand, the circular key is held axially without freedom of axial displacement and thus ensure the centering of the base ring axially, and, that on the other hand, the circular key can move radially in a space defined by the notches in particular when the base ring expands. For this, the radial dimensions of the first and second notches preferably have larger dimensions than the radial dimensions of the circular key, and the axial dimensions of the circular key are equal to the axial space. defined by the first and second notches when the hub and the plate are assembled.

Avantageusement, la clavette circulaire peut comprendre deux joints toriques externes respectivement disposés de part et d'autre de la couronne de base sur la surface radiale externe de la clavette circulaire, et deux joints toriques internes respectivement disposés de part et d'autre de la couronne de base sur la surface radiale interne de la clavette circulaire.Advantageously, the circular key may comprise two outer O-rings respectively disposed on either side of the base ring on the outer radial surface of the circular key, and two internal O-rings respectively disposed on either side of the ring. base on the inner radial surface of the circular key.

Les deux joints toriques internes permettent de fournir un centrage radial de la couronne de base à froid, c'est-à-dire alors que la roue à aubes est à l'arrêt, grâce à son diamètre interne. Les deux joints toriques externes permettent de conserver le centrage de la couronne de base lors de la mise en rotation de la roue à aubes entraînant une dilatation de la couronne de base plus importante que la dilatation des pièces de fixation, c'est-à-dire du plateau et du moyeu. Le centrage radial est conservé grâce à la déformation naturelle des joints toriques internes et externes lors de la montée en vitesse de rotation de l'arbre rotatif. A pleine vitesse de rotation, le centrage de la couronne de base est conservé grâce au diamètre externe de la clavette circulaire.The two inner O-rings provide a radial centering of the base ring cold, that is to say while the paddle wheel is stopped, thanks to its internal diameter. The two outer O-rings make it possible to maintain the centering of the base ring when the impeller is rotated, causing the base ring to expand more than the expansion of the fasteners, ie say plateau and hub. Radial centering is maintained by the natural deformation of the inner and outer O-rings as the rotating shaft rotates. At full rotational speed, the centering of the basic crown is preserved thanks to the outer diameter of the circular key.

Au lieu des deux joints toriques internes disposés de part et d'autre de la couronne de base sur la surface interne de la clavette circulaire, la clavette circulaire peut comprendre un seul joint torique interne disposé sur la surface interne de la clavette circulaire de manière centré. Cependant, l'utilisation de deux joints toriques internes permet un meilleur équilibrage.Instead of the two inner O-rings disposed on either side of the base ring on the inner surface of the circular key, the circular key may comprise a single inner O-ring disposed on the inner surface of the circular key centrally. . However, the use of two internal O-rings allows a better balancing.

La roue à aubes peut avantageusement comprendre des moyens de guidage radial aptes à limiter les frottements entre la couronne de base et le moyeu, et entre la couronne de base et le plateau lors de la déformation radiale de la couronne de base.The impeller may advantageously comprise radial guiding means capable of limiting the friction between the base ring and the hub, and between the base ring and the plate during the radial deformation of the base ring.

Les frottements entre la couronne de base et le moyeu peuvent entraîner une dégradation des pièces de fixation mécanique et/ou de la couronne de base. En effet, les frottements peuvent entraîner l'apparition de fissures dans la couronne de base et/ou dans le plateau et/ou le moyeu.Friction between the base ring and the hub can cause degradation of the mechanical fasteners and / or the base ring. Indeed, the friction can cause the appearance of cracks in the base ring and / or in the plate and / or the hub.

De préférence, les moyens de guidage radial comprennent sur chacune des faces axiales de la couronne de base au moins une rainure circulaire disposée dans la clavette circulaire, les rainures circulaires comprenant chacune un joint torique ou des moyens de roulement.Preferably, the radial guide means comprise on each of the axial faces of the base ring at least one circular groove disposed in the circular key, the circular grooves each comprising an O-ring or rolling means.

La clavette circulaire comprend ainsi au moins une rainure en regard de la première encoche réalisée dans le moyeu et au moins une rainure en regard de la seconde encoche réalisée dans le plateau. Les moyens de roulement, tels que des billes, des rouleaux, ou des roulettes par exemple, ou les joints toriques sont insérés dans les rainures circulaires et sont dimensionnés de manière à ce que, sur les faces axiales de la couronne de base, la clavette circulaire ne soit pas directement en contact avec le plateau d'un côté et avec le moyeu de l'autre côté.The circular key thus comprises at least one groove facing the first notch made in the hub and at least one groove facing the second notch made in the plate. The rolling means, such as balls, rollers, or rollers for example, or the O-rings are inserted in the circular grooves and are dimensioned so that, on the axial faces of the base ring, the key circular is not in direct contact with the tray on one side and with the hub on the other side.

Dans une variante, la seconde encoche réalisée dans le plateau comprend une surface de contact radial externe oblique, la surface radiale externe de la clavette comprend une portion oblique correspondante en regard de la surface de contact radial externe oblique du plateau, et le plateau est assemblé avec le moyeu de manière à pouvoir se déformer et s'écarter du moyeu sur une portion distale radiale lors de la déformation radiale de la couronne de base.In a variant, the second notch made in the plate comprises an oblique outer radial contact surface, the outer radial surface of the key comprises a corresponding oblique portion facing the oblique outer radial contact surface of the plate, and the plate is assembled. with the hub so as to be deformable and deviate from the hub on a radial distal portion during the radial deformation of the base ring.

Ainsi lorsque la couronne de base se dilate radialement par rapport au moyeu avec l'augmentation de la vitesse de rotation, la clavette circulaire exerce une force radiale sur le plateau et notamment sur la surface de contact radiale externe oblique. La force ainsi appliquée par la clavette circulaire sur la surface de contact radiale externe oblique entraîne, grâce à la flexibilité du plateau et notamment de sa partie distale, l'écartement du plateau par rapport au moyeu et donc un accroissement de l'espace entre les deux encoches. Le point d'appui entre la surface radiale externe de la clavette circulaire et la surface de contact radial externe oblique du plateau se déplace alors permettant à la fois la dilatation radiale de la couronne et l'application d'une force axiale de maintien par la partie distale du plateau sur la clavette circulaire vers le moyeu, ce qui permet de maintenir le centrage de la couronne de base.Thus, when the base ring expands radially with respect to the hub with the increase of the speed of rotation, the circular key exerts a radial force on the plate and in particular on the oblique outer radial contact surface. The force thus applied by the circular key on the oblique outer radial contact surface results, thanks to the flexibility of the plate and in particular of its distal portion, the spacing of the plate relative to the hub and therefore an increase in the space between the two notches. The point of support between the outer radial surface of the circular key and the oblique outer radial contact surface of the plate then moves allowing both the radial expansion of the crown and the application of an axial holding force by the distal portion of the plate on the circular key to the hub, which maintains the centering of the base ring.

Avantageusement, le plateau peut comprendre des moyens de centrage et le moyeu peut comprendre des moyens de centrage complémentaires aptes à coopérer avec les moyens de centrage.Advantageously, the plate may comprise centering means and the hub may comprise complementary centering means capable of cooperating with the centering means.

Les moyens de centrage et les moyens de centrage complémentaires permettent ainsi d'assembler le moyeu et le plateau de manière centrée radialement, c'est-à-dire par rapport à l'axe de rotation de la roue à aubes, et ainsi d'obtenir une force de maintien axiale uniforme appliquée sur la couronne de base permettant le centrage axial de la couronne de base.The centering means and the complementary centering means thus make it possible to assemble the hub and the plate in a radially centered manner, that is to say with respect to the axis of rotation of the impeller, and thus to obtain a uniform axial holding force applied to the base ring for axial centering of the base ring.

Les moyens de centrage peuvent avantageusement comprendre un anneau de centrage fixé sur le plateau et comportant une denture en regard du moyeu, et les moyens de centrage complémentaires comprennent un anneau de centrage complémentaire fixé sur le moyeu et comportant une denture complémentaire en regard du plateau apte à coopérer avec la denture de l'anneau de centrage.The centering means may advantageously comprise a centering ring fixed on the plate and having a toothing facing the hub, and the complementary centering means comprise a complementary centering ring fixed on the hub and having a complementary toothing facing the plate suitable for to cooperate with the toothing of the centering ring.

L'anneau de centrage et l'anneau de centrage complémentaire peuvent correspondre à un engrenage axial tel qu'une denture de type Hirth®.The centering ring and the complementary centering ring may correspond to an axial gear such as a Hirth ® type toothing.

Dans une variante, les moyens de centrage peuvent comprendre une portion proximale du plateau en saillie conique en regard du moyeu et ayant pour axe l'arbre rotatif, et les moyens de centrage complémentaires comprennent dans le moyeu un évidement conique en regard du plateau ayant pour axe l'arbre rotatif, la portion en saillie conique et l'évidement conique étant apte à coopérer lors de l'assemblage du plateau avec le moyeu.In one variant, the centering means may comprise a proximal portion of the plate projecting conically facing the hub and having the axis of the rotary shaft, and the complementary centering means comprise in the hub a conical recess facing the plate having axis the rotary shaft, the tapered projecting portion and the conical recess being adapted to cooperate during assembly of the plate with the hub.

Dans le cas où le moyeu est fretté ou intégré à l'arbre rotatif et le plateau reste libre par rapport à l'arbre rotatif, la transmission du couple entre l'arbre et le plateau peut être réalisée par friction entre la portion en saillie conique du plateau et l'évidement conique du moyeu, ou bien par l'utilisation d'un pion ou d'une clavette entre le moyeu et le plateau.In the case where the hub is shrunk or integrated with the rotary shaft and the plate remains free with respect to the rotary shaft, the transmission of the torque between the shaft and the plate can be achieved by friction between the conically projecting portion. of the plate and the conical recess of the hub, or by the use of a pin or a key between the hub and the plate.

Avantageusement, le moyeu peut être disposé sur une première portion d'arbre et le plateau peut être disposé sur une seconde portion d'arbre, la première portion d'arbre et la seconde portion d'arbre étant solidarisés par des moyens de fixation de manière à solidariser le moyeu et le plateau.Advantageously, the hub may be disposed on a first shaft portion and the plate may be disposed on a second shaft portion, the first shaft portion and the second shaft portion being secured by fastening means so as to secure the hub and the plate.

La première portion d'arbre peut ainsi comprendre un orifice fileté selon l'axe de rotation de l'arbre sur l'embout en regard de la seconde portion d'arbre, et la seconde portion d'arbre peut comprendre sur l'embout en regard de la première portion d'arbre une vis dont le filetage correspond au filetage de l'orifice de la première portion d'arbre.The first shaft portion may thus comprise a threaded orifice along the axis of rotation of the shaft on the end facing the second shaft portion, and the second shaft portion may comprise on the end piece. view of the first shaft portion a screw whose thread corresponds to the thread of the orifice of the first shaft portion.

Pour solidariser le couple le plateau et le moyeu, la roue à aubes peut également comprendre une bride de fixation boulonnée apte à solidariser le plateau avec le moyeu. La bride de fixation peut par exemple être traversante dans le plateau et filetée dans le moyeu de manière à fixer une vis dans le moyeu au travers du plateau, avec la tête de la vis en appui sur une face du plateau.To secure the torque plate and the hub, the impeller may also include a bolted fastening flange adapted to secure the plate with the hub. The fixing flange may for example be through in the plate and threaded in the hub so as to fix a screw in the hub through the plate, with the head of the screw resting on one side of the plate.

De préférence, la roue à aubes comprend une flasque couplée à la couronne de base via les aubes, la flasque et la couronne de base possédant une masse identique.Preferably, the impeller comprises a flange coupled to the base ring via the blades, the flange and the base ring having an identical mass.

L'égalité des masses de la flasque et de la couronne de base permet d'obtenir un effort centrifuge quasi symétrique de part et d'autre de la liaison avec les aubes. Les contraintes dans la couronne de base sont ainsi moins importantes, et on favorise ainsi une déformation quasi radiale de la couronne de base qui n'est bloquée qu'axialement sur l'arbre grâce au plateau et au moyeu.The equality of the masses of the flange and the base ring makes it possible to obtain an almost symmetrical centrifugal force on either side of the connection with the blades. The stresses in the base ring are thus less important, and thus promotes a near radial deformation of the base ring which is blocked only axially on the shaft through the plate and the hub.

Le moyeu peut être fretté ou intégré sur au moins une partie de l'arbre rotatif du compresseur.The hub may be shrunk or integrated on at least a portion of the rotary shaft of the compressor.

Le plateau peut également être fretté ou intégré sur au moins une partie de l'arbre rotatif du compresseur.The tray can also be shrunk or integrated on at least a portion of the rotary shaft of the compressor.

Selon un autre aspect, il est proposé, dans un mode de réalisation, un groupe moto-compresseur comprenant un moteur, un compresseur et un carter commun étanche au gaz à comprimer dans lequel sont montés le moteur et le compresseur, le compresseur comprenant au moins une roue à aubes comme défini ci-dessus.According to another aspect, it is proposed, in one embodiment, a motor-compressor unit comprising a motor, a compressor and a compressible gas-tight common housing in which are mounted the engine and the compressor, the compressor comprising at least a paddle wheel as defined above.

D'autres avantages et caractéristiques de l'invention apparaîtront à l'examen de la description détaillée de modes de réalisation, nullement limitatifs, et des dessins annexés sur lesquels :

  • la figure 1 est une vue schématique montrant l'architecture générale d'un groupe moto-compresseur doté de roues à aubes conformes à l'invention ;
  • les figures 2a et 2b représentent respectivement une vue éclatée et une vue assemblée d'une roue à aubes selon un premier mode de réalisation ;
  • la figure 3 représente une roue à aubes selon un second mode de réalisation ;
  • les figures 4a et 4b représentent une roue à aubes selon un troisième mode de réalisation ;
  • la figure 5 illustre une variante du mode de réalisation des figures 4a et 4b ; et
  • la figure 6 illustre une roue à aubes selon un autre mode de réalisation.
Other advantages and characteristics of the invention will appear on examining the detailed description of embodiments, which are in no way limiting, and the appended drawings in which:
  • the figure 1 is a schematic view showing the general architecture of a motor-compressor unit equipped with paddle wheels according to the invention;
  • the Figures 2a and 2b respectively represent an exploded view and an assembled view of a paddle wheel according to a first embodiment;
  • the figure 3 represents a paddle wheel according to a second embodiment;
  • the Figures 4a and 4b represent a paddle wheel according to a third embodiment;
  • the figure 5 illustrates a variant of the embodiment of the Figures 4a and 4b ; and
  • the figure 6 illustrates a paddle wheel according to another embodiment.

Sur la figure 1, on a représenté un exemple de groupe compresseur pourvu de roues aubées réalisées conformément à l'invention.On the figure 1 there is shown an example of a compressor unit provided with impeller wheels made according to the invention.

On notera toutefois que l'application illustrée à la figure 1 n'est nullement limitative, l'invention concernant, de manière générale, la compression mécanique d'un gaz de sorte que l'on ne sort pas du cadre de l'invention lorsque les roues aubées sont montées sur d'autres types de compresseurs.Note, however, that the application illustrated in figure 1 is in no way limiting, the invention concerning, in a general manner, the mechanical compression of a gas so that it is not beyond the scope of the invention when the impeller wheels are mounted on other types of compressors .

Le groupe moto-compresseur illustré sur la figure 1 comprend essentiellement un moteur 1, constitué par exemple par un moteur électrique à vitesse variable entraînant en rotation un rotor 2, entraînant lui-même à vitesse identique un arbre rotatif 3 sur lequel est montée une roue à aubes 4.The motorcycle compressor group illustrated on the figure 1 essentially comprises a motor 1, constituted for example by a variable speed electric motor driving a rotor 2 in rotation, itself driving at identical speed a rotary shaft 3 on which is mounted a paddle wheel 4.

Le groupe moto-compresseur comporte ici un unique étage de compression constitué par les roues radiales à aubes 4 qui assure l'aspiration d'un gaz délivré à partir d'une conduite d'entrée 5 pour provoquer un accroissement de sa pression et le délivrer en sortie 5'.The motor-compressor unit here comprises a single compression stage constituted by radial vane wheels 4 which ensures the suction of a gas delivered from an inlet pipe 5 to cause an increase in its pressure and deliver it at the exit 5 '.

Dans l'exemple de réalisation représenté, le rotor 2 est supporté par deux paliers d'extrémité 6 et 7. Tel est également le cas de l'arbre rotatif 3 qui est également supporté par deux paliers d'extrémités 8 et 9. Ainsi, selon cet agencement, le rotor 2 et l'arbre rotatif 3 sont reliés par un accouplement flexible 10. Le rotor et l'arbre rotatif pourraient également être reliés par un accouplement fixe. Dans ce cas, l'un des paliers, tels que 7 et 8, pourrait être omis.In the exemplary embodiment shown, the rotor 2 is supported by two end bearings 6 and 7. This is also the case of the rotary shaft 3 which is also supported by two end bearings 8 and 9. Thus, according to this arrangement, the rotor 2 and the rotary shaft 3 are connected by a flexible coupling 10. The rotor and the rotary shaft could also be connected by a fixed coupling. In this case, one of the bearings, such as 7 and 8, could be omitted.

Enfin, l'ensemble, c'est-à-dire le moteur 1 et l'étage de compression est disposé dans un carter commun 11 étanche au gaz manipulé par le compresseur. En d'autres termes, le moteur 1 est ici à la pression d'aspiration du groupe moto-compresseur.Finally, the assembly, that is to say the engine 1 and the compression stage is disposed in a gas-tight common housing 11 handled by the compressor. In other words, the engine 1 is here at the suction pressure of the motor-compressor unit.

Les figures 2a et 2b présentent respectivement une vue éclatée et une vue assemblée d'un premier exemple de roues à aubes selon un mode de réalisation de l'invention, pouvant être montées dans le groupe compresseur de la figure 1.The Figures 2a and 2b respectively show an exploded view and an assembled view of a first example of paddle wheels according to one embodiment of the invention, which can be mounted in the compressor unit of the figure 1 .

La roue à aubes 4 comprend trois parties distinctes : une couronne de base 12, un moyeu 13, un plateau 14.The impeller 4 comprises three distinct parts: a base ring 12, a hub 13, a plate 14.

La couronne de base 12 comprend une partie distale 12a et une partie proximale 12b par rapport à son axe de rotation confondu avec l'axe de rotation de l'arbre rotatif 3. La couronne de base 12 s'étend dans un plan orthogonal à son axe de rotation et comprend une première face 12f et une face opposée à la 12o. La couronne de base 12 comporte, principalement sur sa partie distale 12a, des aubes 15 en saillie sur la première face 12f de la couronne de base 12 en regard d'un flasque 16.The base ring 12 comprises a distal portion 12a and a proximal portion 12b relative to its axis of rotation coincides with the axis of rotation of the rotary shaft 3. The base ring 12 extends in a plane orthogonal to its axis of rotation and comprises a first face 12f and a face opposite the 12o. The base ring 12 has, mainly on its distal portion 12a, blades 15 projecting on the first face 12f of the base ring 12 opposite a flange 16.

Le flasque 16 comprend une partie distale 16a et une partie proximale 16b par rapport à son axe de rotation confondu avec l'axe de rotation de l'arbre rotatif 3. La partie distale 16a du flasque 16 est disposée de manière parallèle à la partie distale 12a de la couronne de base 12 et est couplée aux aubes 15 sur une face 16f en regard de la couronne de base 12.The flange 16 comprises a distal portion 16a and a proximal portion 16b with respect to its axis of rotation coincides with the axis of rotation of the rotary shaft 3. The distal portion 16a of the flange 16 is disposed parallel to the distal portion 12a of the base ring 12 and is coupled to the vanes 15 on a face 16f opposite the base ring 12.

Le flasque 16 et la couronne de base 12 possèdent une masse similaire de façon à obtenir un effort centrifuge quasi symétrique de part et d'autre de la liaison avec les aubes 15. Les contraintes dans la couronne de base 12 sont ainsi moins importantes, et l'on favorise ainsi une déformation quasi radiale de la couronne de base 12.The flange 16 and the base ring 12 have a similar mass so as to obtain an almost symmetrical centrifugal force on either side of the connection with the blades 15. The stresses in the base ring 12 are thus less important, and thus promotes a quasi-radial deformation of the base ring 12.

La couronne de base 12 comporte sur sa partie proximale 12b une clavette circulaire 17. La clavette circulaire 17 est notamment disposée le long du périmètre intérieur de la couronne de base 12. La clavette circulaire 17 comprend dans cet exemple une section de forme générale en carré.The base ring 12 has on its proximal portion 12b a circular key 17. The circular key 17 is in particular arranged along the inner perimeter of the base ring 12. The circular key 17 comprises in this example a section of generally square shape .

Le moyeu 13 possède une forme annulaire dont l'axe de rotation est confondu avec l'axe de l'arbre rotatif 3. Le moyeu 13 possède une face d'appui 13f orthogonale à l'axe de l'arbre rotatif 3 et destinée à être en regard du plateau 14, une portion distale 13a et une portion proximale 13b par rapport à son axe de rotation.The hub 13 has an annular shape whose axis of rotation coincides with the axis of the rotary shaft 3. The hub 13 has a bearing face 13f orthogonal to the axis of the rotary shaft 3 and intended to facing the plate 14, a distal portion 13a and a proximal portion 13b with respect to its axis of rotation.

Le plateau 14 possède également une forme annulaire dont l'axe de rotation est confondu avec l'axe de l'arbre rotatif 3. Le plateau comprend une face d'appui 14f orthogonale à l'axe de l'arbre rotatif 3 et destinée à être en regard du moyeu 13, une portion distale 14a et une portion proximale 14b par rapport à son axe de rotation.The plate 14 also has an annular shape whose axis of rotation coincides with the axis of the rotary shaft 3. The plate comprises a bearing face 14f orthogonal to the axis of the rotary shaft 3 and intended to be facing the hub 13, a distal portion 14a and a proximal portion 14b relative to its axis of rotation.

Le moyeu 13 comporte sur la partie distale 13a de sa face d'appui 13f une première encoche 18 apte à recevoir en partie la clavette circulaire 17. Le plateau comporte sur la partie distale 14a de sa face d'appui 14f une seconde encoche 19 apte à recevoir en partie la clavette circulaire 17. La première encoche 18 et la seconde encoche 19 sont réalisées de manière à être en regard l'une de l'autre avec des dimensions identiques de sorte que la seconde encoche 19 est symétrique à la première encoche 19 par rapport à l'axe défini par les faces d'appuis 13f et 14f lorsque le moyeu et le plateau sont en contact.The hub 13 has on the distal portion 13a of its bearing face 13f a first notch 18 adapted to partially receive the circular key 17. The plate has on the distal portion 14a of its bearing face 14f a second notch 19 fit to receive in part the circular key 17. The first notch 18 and the second notch 19 are made to be facing each other with identical dimensions so that the second notch 19 is symmetrical to the first notch 19 relative to the axis defined by the bearing faces 13f and 14f when the hub and the plate are in contact.

Les encoches 18 et 19 peuvent ne pas être symétriques par rapport à la clavette circulaire 17, tant que la jonction entre la clavette circulaire 17 et le reste de la couronne de base 12 est centré par rapport à la couronne de base 12. Les encoches 18 et 19 peuvent ainsi comporter des formes complémentaires de manière à maintenir axialement la clavette circulaire 17 et à définir un passage pour la jonction entre la clavette circulaire 17 et le reste de la couronne de base 12, la jonction étant centrée par rapport à la clavette circulaire 17 et le reste de la couronne de base 12.The notches 18 and 19 may not be symmetrical with respect to the circular key 17, as long as the junction between the circular key 17 and the remainder of the base ring 12 is centered with respect to the base ring 12. The notches 18 and 19 may thus comprise complementary shapes so as to axially hold the circular key 17 and to define a passage for the junction between the circular key 17 and the remainder of the crown. base 12, the junction being centered with respect to the circular key 17 and the remainder of the base ring 12.

Dans ce mode de réalisation, les encoches 18 et 19 sont dimensionnées de manière à maintenir la clavette circulaire 17 axialement, c'est-à-dire à être en appui avec la clavette circulaire 17 dans une direction parallèle à l'axe de rotation de la couronne de base 12.In this embodiment, the notches 18 and 19 are dimensioned so as to maintain the circular key 17 axially, that is to say to be in abutment with the circular key 17 in a direction parallel to the axis of rotation of the the basic crown 12.

La clavette circulaire 17 peut comprendre une section de forme différente de la forme carrée, comme par exemple une forme hexagonale, octogonale, ou toute autre forme apte à coopérer avec les première et seconde encoches 18 et 19.The circular key 17 may comprise a section of shape different from the square shape, such as for example a hexagonal, octagonal shape, or any other shape adapted to cooperate with the first and second notches 18 and 19.

En revanche, les dimensions radiales des encoches 18 et 19 sont plus grandes que la dimension de la clavette circulaire 17 dans une direction orthogonale à l'axe de rotation de la couronne de base 12. Ceci de manière à conserver une liberté de déplacement radial de la clavette circulaire 17 notamment lorsque la couronne de base 12 se déforme avec la vitesse de rotation.On the other hand, the radial dimensions of the notches 18 and 19 are larger than the dimension of the circular key 17 in a direction orthogonal to the axis of rotation of the base ring 12. This is so as to maintain a freedom of radial displacement of the circular key 17 especially when the base ring 12 is deformed with the speed of rotation.

Le centrage radial à froid de la couronne de base 12, c'est-à-dire lorsque la roue à aubes 4 est à l'arrêt ou à faible vitesse, est réalisé grâce au diamètre interne de la clavette circulaire 17, tandis que le centrage de la couronne de base 12 à pleine vitesse est réalisé grâce au diamètre externe de la clavette circulaire, après que la couronne de base s'est dilatée.The cold radial centering of the base ring 12, that is to say when the paddle wheel 4 is stopped or at low speed, is achieved thanks to the internal diameter of the circular key 17, while the centering of the base ring 12 at full speed is achieved through the outer diameter of the circular key, after the base ring has expanded.

La clavette circulaire 17 comprend une surface radiale interne 17i orientée vers l'axe de rotation de la couronne de base et une surface radiale externe 17e opposée à la surface radiale interne 17i. La clavette circulaire 17 comprend sur sa surface radiale externe 17e deux joints toriques externes 20. Les deux joints toriques externes 20 sont respectivement disposés de part et d'autre de la couronne de base 12, c'est-à-dire l'un du côté de la première face 12f de la couronne de base 12 et l'autre du côté opposé 12o.The circular key 17 comprises an inner radial surface 17i oriented towards the axis of rotation of the base ring and an outer radial surface 17e opposite to the inner radial surface 17i. The circular key 17 comprises on its outer radial surface 17e two outer O-rings 20. The two outer O-rings 20 are respectively disposed on either side of the base ring 12, that is to say one of the side of the first face 12f of the base ring 12 and the other of the opposite side 12o.

De la même manière, la clavette circulaire 17 comprend sur sa surface radiale interne 17i deux joints toriques internes 21 respectivement disposés de part et d'autre de la couronne de base 12, c'est-à-dire symétriquement de part et d'autre du plan dans lequel s'étend la couronne de base 12.In the same way, the circular key 17 comprises on its inner radial surface 17i two internal O-rings 21 respectively disposed on either side of the base ring 12, that is to say symmetrically on both sides of the plane in which the base ring 12 extends.

Ainsi, au démarrage, la couronne de base 12 est centrée radialement grâce au diamètre interne de la clavette circulaire 17. En rotation, la couronne de base 12 peut se déformer plus rapidement que le moyeu 13 et le plateau 14 qui constituent les éléments de fixation, et cela avec de légères contraintes de retenu dues aux efforts de frottement au niveau du guidage radial entre la clavette circulaire 17 et le moyeu, d'une part, et entre la clavette circulaire 17 et le plateau 14, d'autre part. Dans cette phase transitoire, le centrage est conservé grâce aux deux joints toriques externes 20 et aux deux joints toriques internes 21 se déformant naturellement. Lorsque la vitesse de fonctionnement est atteinte, le gonflement radial maximum de la couronne de base 12 est atteint, le plateau et le moyeu sont configurés pour permettre à la couronne de base d'être centrée grâce au diamètre externe de la clavette circulaire 17.Thus, at startup, the base ring 12 is centered radially thanks to the internal diameter of the circular key 17. In rotation, the base ring 12 can deform more rapidly than the hub 13 and the plate 14 which constitute the fastening elements. and this with slight restraints due to the frictional forces at the radial guide between the circular key 17 and the hub, on the one hand, and between the circular key 17 and the plate 14, on the other hand. In this transitional phase, the centering is preserved thanks to the two outer O-rings 20 and the two inner O-rings 21 which deform naturally. When the operating speed is reached, the maximum radial swelling of the base ring 12 is reached, the plate and the hub are configured to allow the base ring to be centered thanks to the outer diameter of the circular key 17.

Lorsque la vitesse diminue, la couronne de base 12 reproduit la déformation opposée jusqu'à être de nouveau centrée à basse vitesse.When the speed decreases, the base ring 12 reproduces the opposite deformation until it is again centered at low speed.

Le moyeu 13 est intégré à une première portion d'arbre 4a et le plateau 14 est intégré à une seconde portion d'arbre 3b. Le moyeu 13 et le plateau 14 pourraient également être frettés respectivement sur la première et la seconde portions d'arbre 3a et 3b. L'assemblage du moyeu 13 avec le plateau 14 est réalisé par vissage de la seconde portion d'arbre 3b dans la première portion d'arbre 3a, la première portion d'arbre 3a comportant un orifice fileté selon son axe de rotation sur un embout en regard de la seconde portion d'arbre 3b, et la seconde portion d'arbre 3b comportant un embout en regard de la première portion d'arbre 3a possédant un pas de vis correspondant au filetage de l'orifice de la première portion d'arbre 3a.The hub 13 is integrated with a first shaft portion 4a and the plate 14 is integrated with a second shaft portion 3b. The hub 13 and the plate 14 could also be shrunk respectively on the first and the second shaft portions 3a and 3b. The assembly of the hub 13 with the plate 14 is made by screwing the second shaft portion 3b into the first shaft portion 3a, the first shaft portion 3a having a threaded orifice along its axis of rotation on a hub opposite the second shaft portion 3b, and the second shaft portion 3b having a tip opposite the first shaft portion 3a having a thread corresponding to the thread of the orifice of the first portion of tree 3a.

On pourrait également, en variante, utiliser une bride de fixation boulonnée pour solidariser le plateau avec le moyeu, comme cela sera décrit en référence à la figure 3.One could also, alternatively, use a bolted fastening flange to secure the plate with the hub, as will be described with reference to the figure 3 .

Le centrage du moyeu 13 avec le plateau 14 est réalisé à l'aide d'un engrenage axial, par exemple à l'aide d'un système de denture Hirth®. Le plateau 14 comprend un anneau de centrage 22a fixé sur la face d'appui 14f du plateau 14. Le moyeu 13 comprend un anneau de centrage complémentaire 22b fixé sur la face d'appui 13f du moyeu 13. Lors de l'assemblage du moyeu 13 et du plateau 14, l'anneau de centrage 21a coopère avec l'anneau de centrage complémentaire 21b pour le centrage radial, et ainsi faire correspondre radialement les première et seconde encoches 18 et 19.The centering of the hub 13 with the plate 14 is achieved by means of an axial gear, for example by means of a gear system. Hirth ® . The plate 14 comprises a centering ring 22a fixed on the bearing face 14f of the plate 14. The hub 13 comprises a complementary centering ring 22b fixed on the bearing face 13f of the hub 13. During assembly of the hub 13 and the plate 14, the centering ring 21a cooperates with the complementary centering ring 21b for the radial centering, and thus radially match the first and second notches 18 and 19.

Sur la figure 3 est illustré un second exemple de roue à aubes 4 selon un mode de réalisation de l'invention. Les éléments portant les mêmes références que sur les figures 2a et 2b sont identiques.On the figure 3 is illustrated a second example of impeller 4 according to one embodiment of the invention. Elements bearing the same references as on the Figures 2a and 2b are the same.

Dans ce mode de réalisation, la clavette circulaire 17' comprend des moyens de guidage radial permettant d'éviter les frottements entre la clavette circulaire 17' et le moyeu 13 d'une part, et entre la clavette circulaire 17' et le plateau 14 d'autre part. Les moyens de guidage radial comprennent sur la première face 12f et la face opposée 12o de la couronne de base 12 au moins une rainure circulaire 23 disposée dans la clavette circulaire 17'. Chaque rainure circulaire 23 comprend des billes 24 de roulement permettant de séparer la clavette circulaire 17' du moyeu 13 d'une part, et la clavette circulaire 17' du plateau 14 d'autre part.In this embodiment, the circular key 17 'comprises radial guiding means making it possible to avoid friction between the circular key 17' and the hub 13 on the one hand, and between the circular key 17 'and the plate 14 'somewhere else. The radial guide means comprise on the first face 12f and the opposite face 12o of the base ring 12 at least one circular groove 23 disposed in the circular key 17 '. Each circular groove 23 comprises rolling balls 24 for separating the circular key 17 'of the hub 13 on the one hand, and the circular key 17' of the plate 14 on the other hand.

Ce mode de réalisation diffère également de celui représenté sur les figures 2a et 2b de part les moyens de centrage et les moyens de fixation du moyeu 13 avec le plateau 14.This embodiment also differs from that shown in the Figures 2a and 2b from the centering means and the fixing means of the hub 13 with the plate 14.

La roue à aubes 4 illustrée sur la figure 3 comprend comme moyens de fixation, une bride de fixation boulonnée 24 apte à solidariser le plateau 14 avec le moyeu 13. La bride de fixation 24 comprend un trou fileté 25 aveugle dans le moyeu 13, l'ouverture du trou fileté 25 étant disposée sur la face d'appui 13f du moyeu 13. La bride de fixation 24 comprend également un orifice traversant 26 réalisé dans le plateau 14 en regard du trou fileté 25. L'orifice traversant 26 comprend une butée 27 de manière à ce qu'une vis 28 en appui sur la butée 27 puisse maintenir serré le plateau 14 sur le moyeu 13.The paddle wheel 4 illustrated on the figure 3 comprises as fastening means, a bolted fastening flange 24 adapted to secure the plate 14 with the hub 13. The fastening flange 24 comprises a threaded hole 25 blind in the hub 13, the opening of the threaded hole 25 being disposed on the bearing flange 13f of the hub 13. The fastening flange 24 also comprises a through hole 26 formed in the plate 14 facing the threaded hole 25. The through orifice 26 comprises a stop 27 so that a screw 28 resting on the stop 27 can hold tight the plate 14 on the hub 13.

Pour centrer le plateau 14 et le moyeu 13, le plateau 14 comprend une portion en saillie 29 sur sa partie proximale 14b. La partie en saillie s'étend vers le moyeu 13 avec une forme conique à section décroissante. Le moyeu 13 comprend un évidement 30 complémentaire réalisé dans sa partie proximale 13b avec une forme conique apte à coopérer avec la portion en saillie 29 du plateau 14.To center the plate 14 and the hub 13, the plate 14 comprises a projecting portion 29 on its proximal portion 14b. The projecting portion extends towards the hub 13 with a tapered shape with decreasing section. The hub 13 comprises a complementary recess 30 made in its proximal portion 13b with a conical shape adapted to cooperate with the projecting portion 29 of the plate 14.

Avec de tels moyens de centrage, la roue à aubes 4 pourrait ne pas comprendre de bride de fixation boulonnée 24, la transmission du couple entre le moyeu 13 et le plateau 14 pouvant se faire par friction entre la partie en saillie 29 et les surfaces du moyeu 13 délimitant l'évidement 30, ou bien en montant un pion ou une clavette entre le moyeu 13 et le plateau 14.With such centering means, the impeller 4 may not comprise a bolted fastening flange 24, the transmission of the torque between the hub 13 and the plate 14 may be by friction between the protruding portion 29 and the surfaces of the flange 24. hub 13 delimiting the recess 30, or by mounting a pin or a key between the hub 13 and the plate 14.

Les figures 4a et 4b présentent un troisième exemple de roue à aubes 4 selon un mode de réalisation de l'invention. Les éléments portant les mêmes références que sur les figures 2a et 2b sont identiques. La figure 4a représente le troisième exemple de roue à aubes 4 à l'arrêt ou à faible vitesse de rotation, tandis que la figure 4b représente le troisième exemple de roue à aubes 4 à grande vitesse de rotation.The Figures 4a and 4b show a third example of impeller 4 according to one embodiment of the invention. Elements bearing the same references as on the Figures 2a and 2b are the same. The figure 4a represents the third example of a paddle wheel 4 at a stop or at a slow rotational speed, while the figure 4b represents the third example of a paddle wheel 4 with a high rotational speed.

Dans ce mode de réalisation, la seconde encoche 19 réalisée dans le plateau 14 comprend une surface de contact radial externe 31 oblique de manière à former un angle obtus avec la face de l'encoche 32 en regard du moyeu 13.In this embodiment, the second notch 19 made in the plate 14 comprises an outer radial contact surface 31 oblique so as to form an obtuse angle with the face of the notch 32 facing the hub 13.

En correspondance, la surface radiale externe 17"e de la clavette circulaire 17" comprend une portion oblique regard et parallèle à la surface de contact radial externe 31 oblique du plateau 14. En variante, la clavette circulaire 17" peut comporter une section de forme hexagonale, l'une des faces de la clavette circulaire 17" étant parallèle et en regard de la surface de contact radial externe 17"e.In correspondence, the outer radial surface 17 "e of the circular key 17" comprises an oblique portion facing and parallel to the oblique outer radial contact surface 31 of the plate 14. In a variant, the circular key 17 "may comprise a section of shape hexagonal, one of the faces of the circular key 17 "being parallel and facing the outer radial contact surface 17" e.

Le plateau 14 est solidarisé avec le moyeu 13 à l'aide d'une bride de fixation 24". La bride de fixation 24" est montée sur le plateau 14 au niveau de la partie proximale 14b de sorte que le plateau 14 puisse se déformer et s'écarter du moyeu 13 sur une portion distale 14a lors de la déformation radiale de la couronne de base 12.The plate 14 is secured to the hub 13 by means of a fastening flange 24. The fastening flange 24 "is mounted on the plate 14 at the proximal portion 14b so that the plate 14 can be deformed. and move away from the hub 13 on a distal portion 14a during the radial deformation of the base ring 12.

Dans un mode de réalisation, on pourrait également prévoir une autre surface oblique pratiquée dans le moyeu, à l'endroit de l'angle formé par l'encoche 18 et une surface au contact radial correspondante 31 oblique dans la clavette circulaire 17 » (figure 5).In one embodiment, it is also possible to provide another oblique surface formed in the hub at the angle formed by the notch 18 and a corresponding radial contact surface 31 oblique in the circular key 17 "(FIG. figure 5 ).

Comme cela est illustré sur la figure 4b, lorsque la roue à aubes 4 est mise en rotation pour atteindre sa vitesse maximale, la couronne de base 12 peut ainsi se déformer radialement, la clavette circulaire 17" s'éloignant légèrement radialement de son axe de rotation grâce à la déformation du plateau 14, et plus précisément de la partie distale 14a du plateau, la portion oblique de la surface radiale externe 17"e de la clavette circulaire 17" glissant le long de la surface de contact radial externe 31 oblique.As illustrated on the figure 4b when the impeller 4 is rotated to reach its maximum speed, the base ring 12 can thus deform radially, the circular key 17 "moving slightly radially away from its axis of rotation due to the deformation of the plate 14 , and more specifically of the distal portion 14a of the plate, the oblique portion of the outer radial surface 17 "e of the circular key 17" sliding along the outer radial contact surface 31 oblique.

L'invention ne se limite pas à ces trois différents de réalisation. Elle comprend également toutes les combinaisons possibles entre ces modes de réalisation.The invention is not limited to these three different embodiments. It also includes all possible combinations between these embodiments.

L'invention permet ainsi de fournir une roue à aubes avec une couronne de base possédant une liberté de déformation radiale, et une possibilité d'utiliser des matériaux pour la couronne de base qui ne sont pas utilisables pour les pièces de fixation.The invention thus makes it possible to provide a blade wheel with a base ring having a freedom of radial deformation, and a possibility of using materials for the base ring that are not usable for the fasteners.

Enfin, en se référant maintenant à la figure 5, sur laquelle des éléments identiques aux éléments des figures 2a et 2b portent les mêmes références numériques, selon un autre exemple de réalisation, le plateau 14 peut venir se fixer par boulonnage sur le moyeu 13 et constituer ainsi un élément distinct de l'arbre rotatif 3.Finally, referring now to the figure 5 , on which elements identical to the elements of the Figures 2a and 2b have the same reference numerals, according to another embodiment, the plate 14 can be fixed by bolting on the hub 13 and thus constitute a separate element of the rotary shaft 3.

Sur cette figure 6, le système de boulonnage utilisé pour fixer le plateau 14 sur le moyeu 13 n'a pas été représenté. On notera toutefois que l'on pourrait avantageusement utiliser une bride de fixation boulonnée similaire à celle décrite en référence à la figure 3.On this figure 6 the bolting system used to secure the plate 14 to the hub 13 has not been shown. Note, however, that one could advantageously use a bolted fastening flange similar to that described with reference to the figure 3 .

On notera par ailleurs que, dans ce mode de réalisation, la clavette circulaire 17 est dotée d'un ensemble de surfaces de contact radial coopérant avec des surfaces obliques correspondantes pratiquées sur le moyeu, d'une part et sur le plateau, d'autre part.Note also that, in this embodiment, the circular key 17 is provided with a set of radial contact surfaces cooperating with corresponding oblique surfaces formed on the hub, on the one hand and on the plate, on the other hand. go.

Claims (15)

Roue à aubes (4) destinée à être montée sur un arbre rotatif (3) comprenant une couronne de base (12) pourvue d'aubes (15) en saillie sur une face (12f) de la couronne de base (12), et un moyeu (13) annulaire apte à être couplé à la couronne de base (12) et à l'arbre rotatif (3), caractérisée en ce qu'elle comprend un plateau (14) annulaire et en ce que le moyeu (13), le plateau (14) et la couronne de base (12) sont configurés pour coopérer ensemble de manière à maintenir axialement la couronne de base (12) et à conserver une liberté de déformation radiale de la couronne de base (12) par rapport au moyeu (13) et au plateau (14).Impeller (4) for mounting on a rotating shaft (3) comprising a base ring (12) provided with vanes (15) projecting from a face (12f) of the base ring (12), and an annular hub (13) adapted to be coupled to the base ring (12) and to the rotary shaft (3), characterized in that it comprises an annular plate (14) and in that the hub (13) , the plate (14) and the base ring (12) are configured to cooperate together so as to maintain axially the base ring (12) and to maintain a radial deformation freedom of the base ring (12) with respect to the hub (13) and the plate (14). Roue à aubes (4) selon la revendication 1, dans laquelle la couronne de base (12) comprend une clavette circulaire (17) sur son périmètre intérieur apte à coopérer avec une première encoche (18) réalisée dans le moyeu (13) et une seconde encoche (19) réalisée dans le plateau (14), la première et la seconde encoche (18, 19) étant disposées en regard l'une de l'autre de sorte que la clavette circulaire (17) de la couronne de base (12) soit retenue dans les encoches (18, 19) lorsque le moyeu (13), le plateau (14) et la couronne de base (12) sont assemblés.Impeller (4) according to claim 1, wherein the base ring (12) comprises a circular key (17) on its inner perimeter adapted to cooperate with a first notch (18) formed in the hub (13) and a second notch (19) formed in the plate (14), the first and second notches (18, 19) being arranged facing one another so that the circular key (17) of the base ring ( 12) is retained in the notches (18, 19) when the hub (13), the plate (14) and the base ring (12) are assembled. Roue à aubes (4) selon la revendication 2, dans laquelle la clavette circulaire (17) comprend deux joints toriques externes (20) respectivement disposés de part et d'autre de la couronne de base (12) sur la surface radiale externe (17e) de la clavette circulaire (17), et deux joints toriques internes (21) respectivement disposés de part et d'autre de la couronne de base (12) sur la surface radiale interne (17i) de la clavette circulaire (17).Impeller (4) according to claim 2, wherein the circular key (17) comprises two outer O-rings (20) respectively arranged on either side of the base ring (12) on the outer radial surface (17th ) of the circular key (17), and two inner O-rings (21) respectively disposed on either side of the base ring (12) on the inner radial surface (17i) of the circular key (17). Roue à aubes (4) selon l'une des revendications 2 et 3, comprenant des moyens de guidage radial aptes à limiter les frottements entre la couronne de base (12) et le moyeu (13), et entre la couronne de base (12) et le plateau (14) lors de la déformation radiale de la couronne de base (12).Impeller (4) according to one of claims 2 and 3, comprising radial guide means adapted to limit friction between the base ring (12) and the hub (13), and between the base ring (12). ) and the plate (14) during the radial deformation of the base ring (12). Roue à aubes (4) selon la revendication 4, dans laquelle les moyens de guidage radial comprennent sur chacune des faces (12o, 12f) de la couronne de base (12) au moins une rainure circulaire (23) disposée dans la clavette circulaire (17), les rainures circulaires (23) comprenant chacune un joint torique ou des moyens de roulement (24).Impeller (4) according to claim 4, wherein the radial guide means comprise on each of the faces (12o, 12f) of the base ring (12) at least one circular groove (23) disposed in the circular key ( 17), the circular grooves (23) each comprising an O-ring or rolling means (24). Roue à aubes (4) selon la revendication 2, dans laquelle la seconde encoche (19) réalisée dans le plateau (14) comprend une surface de contact radial externe oblique, la surface radiale externe de la clavette comprend une portion oblique correspondante en regard de la surface de contact radial externe oblique du plateau, et le plateau est assemblé avec le moyeu de manière à pouvoir se déformer et s'écarter du moyeu sur une portion distale lors de la déformation radiale de la couronne de base.Impeller (4) according to claim 2, wherein the second notch (19) formed in the plate (14) comprises an oblique outer radial contact surface, the outer radial surface of the key comprises a corresponding oblique portion opposite the oblique outer radial contact surface of the plate, and the plate is assembled with the hub so as to be able to deform and move away from the hub on a distal portion during the radial deformation of the base ring. Roue à aubes (4) selon l'une quelconque des revendications 1 à 6, dans laquelle le plateau (14) comprend des moyens de centrage et le moyeu comprend des moyens de centrage complémentaires aptes à coopérer avec les moyens de centrage.Impeller (4) according to any one of claims 1 to 6, wherein the plate (14) comprises centering means and the hub comprises complementary centering means adapted to cooperate with the centering means. Roue à aubes (4) selon la revendication 7, dans laquelle les moyens de centrage comprennent un anneau de centrage (22a) fixé sur le plateau (14) et comportant une denture en regard du moyeu (13), et les moyens de centrage complémentaires comprennent un anneau de centrage complémentaire (22b) fixé sur le moyeu (13) et comportant une denture complémentaire en regard du plateau (14) apte à coopérer avec la denture de l'anneau de centrage (22a).Impeller (4) according to claim 7, wherein the centering means comprise a centering ring (22a) fixed on the plate (14) and having a toothing facing the hub (13), and the complementary centering means comprise a complementary centering ring (22b) fixed on the hub (13) and having a complementary toothing facing the plate (14) adapted to cooperate with the toothing of the centering ring (22a). Roue à aubes (4) selon la revendication 7, dans laquelle les moyens de centrage comprennent une portion proximale du plateau en saillie (29) conique en regard du moyeu (13) et ayant pour axe l'arbre rotatif (3), et les moyens de centrage complémentaires comprennent dans le moyeu (13) un évidement (30) conique en regard du plateau (14) ayant pour axe l'arbre rotatif (3), la portion en saillie conique (29) et l'évidement conique (30) étant aptes à coopérer lors de l'assemblage du plateau (14) avec le moyeu (13).Impeller (4) according to claim 7, wherein the centering means comprise a proximal portion of the projecting plate (29) conical facing the hub (13) and having as its axis the rotary shaft (3), and the complementary centering means comprise in the hub (13) a conical recess (30) facing the plate (14) having as its axis the rotary shaft (3), the conically projecting portion (29) and the conical recess (30). ) being able to cooperate during the assembly of the plate (14) with the hub (13). Roue à aubes (4) selon l'une quelconque des revendications 1 à 9, dans laquelle le moyeu (13) est disposé sur une première portion d'arbre (4a) et le plateau (14) est disposé sur une seconde portion d'arbre (4b), la première portion d'arbre (4a) et la seconde portion d'arbre (4b) étant solidarisés par des moyens de fixation de manière à solidariser le moyeu (13) et le plateau (14).Impeller wheel (4) according to any one of claims 1 to 9, wherein the hub (13) is disposed on a first portion shaft (4a) and the plate (14) is arranged on a second shaft portion (4b), the first shaft portion (4a) and the second shaft portion (4b) being secured by means of fastening so as to secure the hub (13) and the plate (14). Roue à aubes (4) selon l'une quelconque des revendications 1 à 10, comprenant une bride de fixation boulonnée (24) apte à solidariser le plateau (14) avec le moyeu (13).Impeller (4) according to any one of claims 1 to 10, comprising a bolted fastening flange (24) adapted to secure the plate (14) with the hub (13). Roue à aubes (4) selon l'une quelconque des revendications 1 à 11, comprenant une flasque (16) couplée à la couronne de base (12) via les aubes (15), la flasque (16) et la couronne de base (12) possédant une masse identique.Impeller (4) according to any one of claims 1 to 11, comprising a flange (16) coupled to the base ring (12) via the blades (15), the flange (16) and the base ring ( 12) having an identical mass. Roue à aubes (4) selon l'une des revendications 1 à 12, dans laquelle le moyeu (13) est fretté ou intégré sur au moins une partie de l'arbre rotatif (3) du compresseur.Impeller (4) according to one of claims 1 to 12, wherein the hub (13) is shrunk or integrated on at least a portion of the rotary shaft (3) of the compressor. Roue à aubes (4) selon l'une des revendications 1 à 13, dans laquelle le plateau (14) est fretté ou intégré sur au moins une partie de l'arbre rotatif (3) du compresseur.Impeller (4) according to one of claims 1 to 13, wherein the plate (14) is shrunk or integrated on at least a portion of the rotary shaft (3) of the compressor. Compresseur, caractérisé en ce qu'il comprend au moins une roue à aubes (4) selon l'une quelconque des revendications 1 à 14.Compressor, characterized in that it comprises at least one impeller (4) according to any one of claims 1 to 14.
EP13156150.8A 2012-02-21 2013-02-21 Radial-flow impeller with radially free base ring Active EP2631490B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1251542A FR2987069B1 (en) 2012-02-21 2012-02-21 AUBEE RADIAL WHEEL WITH RADIAL FREE BASE CROWN

Publications (2)

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EP2631490A1 true EP2631490A1 (en) 2013-08-28
EP2631490B1 EP2631490B1 (en) 2016-12-14

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US (1) US9689401B2 (en)
EP (1) EP2631490B1 (en)
BR (1) BR102013004122A2 (en)
FR (1) FR2987069B1 (en)

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Publication number Priority date Publication date Assignee Title
DE102016215738A1 (en) 2016-08-23 2018-03-01 Siemens Aktiengesellschaft Impeller, manufacturing process

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Also Published As

Publication number Publication date
EP2631490B1 (en) 2016-12-14
US20130216393A1 (en) 2013-08-22
FR2987069B1 (en) 2016-01-29
FR2987069A1 (en) 2013-08-23
US9689401B2 (en) 2017-06-27
BR102013004122A2 (en) 2017-05-02

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