EP3011185A1 - Centrifugal rotor - Google Patents

Centrifugal rotor

Info

Publication number
EP3011185A1
EP3011185A1 EP14737288.2A EP14737288A EP3011185A1 EP 3011185 A1 EP3011185 A1 EP 3011185A1 EP 14737288 A EP14737288 A EP 14737288A EP 3011185 A1 EP3011185 A1 EP 3011185A1
Authority
EP
European Patent Office
Prior art keywords
flange
centrifugal wheel
centrifugal
longitudinal axis
wheel
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
EP14737288.2A
Other languages
German (de)
French (fr)
Other versions
EP3011185B1 (en
Inventor
Stéphane Sgambati
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.)
Cryostar SAS
Original Assignee
Cryostar SAS
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Cryostar SAS filed Critical Cryostar SAS
Publication of EP3011185A1 publication Critical patent/EP3011185A1/en
Application granted granted Critical
Publication of EP3011185B1 publication Critical patent/EP3011185B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • F04D29/22—Rotors specially for centrifugal pumps
    • F04D29/2261—Rotors specially for centrifugal pumps with special measures
    • 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
    • F04D29/22—Rotors specially for centrifugal pumps
    • F04D29/24—Vanes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D1/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal 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
    • F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F04D17/08—Centrifugal 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
    • F04D29/18—Rotors
    • F04D29/22—Rotors specially for centrifugal pumps
    • F04D29/2205—Conventional flow pattern
    • 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
    • F04D29/22—Rotors specially for centrifugal pumps
    • F04D29/2261—Rotors specially for centrifugal pumps with special measures
    • F04D29/2272—Rotors specially for centrifugal pumps with special measures for influencing flow or boundary layer
    • 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
    • F04D29/26—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
    • F04D29/30—Vanes

Definitions

  • the present invention relates to a centrifugal wheel.
  • the technical field of the present invention is that of the compression of fluids, liquid or gaseous.
  • the invention thus relates to both pumps that compressors that can respectively bring a liquid or a gas, a given pressure at a higher pressure.
  • a centrifugal wheel is a wheel having an axis of rotation. It is intended to compress a fluid that flows in a direction parallel to its axis of rotation, the compressed fluid coming out of the wheel in a radially outward direction.
  • the element used for this purpose is a fixed part called axial diffuser and which comprises at least one conduit for orienting the compressed fluid.
  • the downstream end of the duct that is to say the end opposite the centrifugal wheel, is oriented axially in the orientation that is desired to give the orientation of the compressed fluid.
  • the axial diffuser then aims to make a turn about 90 ° to the fluid coming out of the centrifugal wheel to orient it axially.
  • Document FR-2 874 241 discloses a high efficiency centrifugal wheel using blades truncated with a radial diffuser.
  • the wake of the blade closes in the diffuser and in cooperation with the other wakes of the adjacent blades creates a laminated flow that relaxes gradually in the diffuser.
  • We find in this document a wheel incorporating a diffuser.
  • the blades, very thick, are located in the lower part of the wheel.
  • US-1,447,916 illustrates another embodiment of a wheel incorporating a diffuser.
  • the latter may be in one piece with the portion of the wheel having vanes or be a separate piece secured to the portion of the wheel having vanes. It should be noted in all the figures that the vanes illustrated only extend over a part of the device (corresponding to the centrifugal wheel) and not up to the peripheral exit of the device and that the part corresponding to the centrifugal wheel has a perfectly radial outlet upstream of the diffuser.
  • a technical problem that we encounter with such a structure is that it is a source of pressure drops for the compressed fluid. It is known that a fluid, when flowing, undergoes pressure losses that depend on the conduit in which it is located and in particular changes of direction that it undergoes.
  • An object of the present invention is thus, for a given compression stage, comprising a centrifugal wheel and an axial diffuser, to increase the performance of this stage, that is to say for example for a given power to obtain a rate higher compression or for a given compression being able to limit the mechanical power necessary to exert on the wheel to rotate it.
  • the present invention proposes a centrifugal wheel comprising:
  • a hub having a longitudinal axis
  • a second flange downstream, separated from the first flange by blades thus forming channels each delimited by the first flange, the second flange and two blades and extending from the fluid inlet to a peripheral outlet.
  • the first flange has a concave zone oriented towards the channels while the second flange has meanwhile a convex zone oriented towards the channels.
  • the passage of a radial flow within the centrifugal wheel to an axial flow in the diffuser downstream of the wheel is made less abruptly to limit the pressure losses when the fluid change of direction.
  • the first flange and the second flange advantageously have a form of revolution about the longitudinal axis.
  • the surface tangent to the concave zone of the first flange at the outlet of the channel forms an angle of between 1 ° and 45 °, preferably between 10 ° and 30 °, with a radial plane perpendicular to the longitudinal axis.
  • the surface tangent to the convex area of the second flange in channel outlet forms an angle of between 1 0 and 45 °, preferably between 10 ° and 30 ° with a radial plane perpendicular to the axis longitudinal.
  • the blades extend to the outer peripheral edge of the first flange and / or the second flange.
  • the first flange advantageously has an outer peripheral edge adjacent to the channels of diameter greater than that of an outer peripheral edge adjacent to the channels of the second flange.
  • the speed is thus higher. This is preferable because the trajectory to be traveled outside a turn is greater than that inside a turn. In this way, a more homogeneous distribution of speed is favored when the fluid then moves according to an essentially longitudinal direction.
  • the present invention furthermore relates to a centrifugal compressor and / or a centrifugal pump which comprises a centrifugal wheel as described above.
  • FIG. 1 illustrates a centrifugal wheel of the prior art by a sectional view of a half wheel mounted in a compressor
  • FIG. 2 is a view similar to that of FIG. 1 for a centrifugal wheel according to a first embodiment according to the present invention
  • Fig. 3 is a view similar to the preceding for a second embodiment of the present invention.
  • FIG. 4 is a perspective view in section along section line IV-IV of FIG. 2.
  • FIG. 1 a centrifugal wheel 2 mounted inside a body 4, for example a compressor body, and on a shaft 6 which has a longitudinal axis 8.
  • a body 4 for example a compressor body
  • a shaft 6 which has a longitudinal axis 8.
  • the following description will be made with reference to a compressor working with air (or more generally gaseous fluids) but the present invention can also be applied to pumps for liquids.
  • the centrifugal wheel 2 is made in one piece and comprises a hub 10, a first flange or upstream flange 12, a second flange or downstream flange 14 and vanes 16.
  • the hub 10 makes it possible to form a connection between the shaft 6 and the centrifugal wheel 2. It has a circular cylindrical overall cylindrical shape and is provided with means enabling it to be secured to the shaft 6. It is thus conventionally possible, for example, to provide a longitudinal groove in the hub 10 and in the shaft 6 to receive a longitudinal key or splines or any other type of connection.
  • the downstream flange 14 is connected directly to the hub 10 and extends radially with respect to the longitudinal axis 8.
  • the upstream / downstream orientation is defined relative to the direction of air flow in the centrifugal wheel 2. Indeed , in Figure 1 (as well as in the other figures) the air is sucked to the right of the wheel then moves longitudinally to the left before being driven in a radial direction to be finally oriented, after being out of the wheel centrifuge 2 in a longitudinal direction again to the left of the figure.
  • the upstream elements are arranged to the right of the downstream elements in the figures.
  • the upstream flange 12 faces the downstream flange 14 and is connected thereto by the blades 16 thus defining channels for air between the two flanges.
  • the air is thus conducted between the inner faces of the flanges and the blades in a radial centrifugal manner.
  • the upstream flange 12 does not extend to the hub 10 but remains at a distance from it. It has facing the hub 10 a sealing bearing 18 before. Towards the inside of the centrifugal wheel 2, the sealing bearing 18 before defines with the hub 10 an inlet chamber 20 with an annular opening 22 upstream of the inlet chamber 20. To the outside, the bearing sealing ring 18 is machined to make it possible to seal the centrifugal wheel 2 in rotation in the body 4. For example, a seal is used, such as for example a labyrinth ring 24, as interface between the centrifugal wheel 2 and the body 4. As can be seen in the figures, the centrifugal wheel 2 also has on the downstream side another sealing bearing 18, or rear sealing bearing, which extends from the downstream flange 14 and receives another labyrinth ring 24.
  • the channels leading the air between the upstream flange 12 and the downstream flange 14 each have an outlet 26 ( Figure 1) oriented radially at the largest diameter of the flanges.
  • the air then enters a diffuser 28 in which it is guided in such a way as to have an air flow that is no longer radial but longitudinal.
  • Channels 30 in the diffuser 28 also make it possible to transform the helical movement of the air flow into a movement substantially straight.
  • FIGS. 2 and 4 illustrate a first embodiment of a centrifugal wheel according to the present invention.
  • the overall structure is substantially the same in FIG. 1 and in FIGS. 2 to 4. Therefore, in FIGS. 2 to 4, references in FIG. 1 are used to designate similar elements.
  • a centrifugal wheel 2 mounted in rotation in a body 4 about a shaft 6 of longitudinal axis 8, the sealing of the centrifugal wheel 2 relative to the body 4 being ensured in particular by sealing bearings 18 cooperating with labyrinth rings 24 (or other type of seal).
  • a hub 10 allows a connection between the wheel and the shaft 6, for example by means of a not shown key.
  • the centrifugal wheel 2 further comprises an upstream flange 12 and a downstream flange 14 interconnected by blades 16.
  • the upstream flange 12 has a sealing bearing 18 which defines with the hub 10 an inlet chamber 20 for opening 22 annular.
  • air or any other fluid
  • a diffuser 28 optionally provided with channels.
  • outlets 26 are essentially at the outlets 26, that is to say at the region of larger diameter of the upstream flange 12, the downstream flange 14 and blades 16.
  • the present invention proposes to provide at the outlet of the centrifugal wheel a flow of air (or other fluid) having an improved velocity vector for enter the longitudinal diffuser.
  • a flow of air or other fluid
  • it is planned to slightly bend the air channels (defined by the flanges and the blades) in the centrifugal wheel 2 near the outlets 26. This produces a curvature at the outlet of the centrifugal wheel which allows increase the air velocity outward of the curvature.
  • the inside face of the upstream flange 12 and the face of the downstream flange 14 are substantially flat (and slightly convergent), the inner face of the upstream flange 12 has near the outlet 26 a concave zone 32 and the inner face of the downstream flange 14 has near the outlet 26, vis-à-vis the concave zone 32, a convex zone 34.
  • this surface will be substantially conical (axis cone the longitudinal axis 8) and form with a radial plane illustrated by a line in dotted line an angle a.
  • this angle is about 15 ° and is about 30 ° in the embodiment of Figure 3.
  • this angle will be between 10 ° and 45 °. In the centrifugal wheels of the prior art, as illustrated in FIG. 1, this angle is substantially zero.
  • the surface tangent to the inner face of the upstream flange 12 has not been illustrated.
  • FIG. 4 illustrates that the blades 16 extend into the convex zone 34 of the downstream flange 14. Of course, they extend in a similar manner into the concave zone 32 of the upstream flange 12. Preferably, as illustrated in FIG. 4, the blades 16 extend to the peripheral edge of the upstream flange 12 and the downstream flange 14, that is to say to the outlets 26 of the wheel.
  • the air is thus accelerated on the upstream side (outside of the "turn" at the exit of the wheel) thus allowing to have a more homogeneous speed at the entrance of a substantially longitudinal section of the diffuser.
  • the pressure drops, even if only within the diffuser, are reduced and thus make it possible to increase the efficiency of the device.
  • the shape of the centrifugal wheel according to the present invention thus allows a more gradual passage of a radial air flow to a longitudinal flow.
  • the distribution of fluid velocities through a passage section of the diffuser is more homogeneous and more regular.
  • the pressure losses are thus limited and a gain in terms of efficiency is thus obtained both when the fluid passes from a substantially radial flow to an axial flow and during its flow in the axial diffuser.
  • the channels in the centrifugal wheel 2 have a passage in which the flow is substantially radial.
  • the inner faces of the upstream flange and the downstream flange each have a curvature inversion.
  • the inner face of the upstream flange 12 has a convex zone near the inlet chamber 20 and then away from the hub 10 after an inflection zone, said inner face has a concave zone as described above.
  • the inner face of the downstream flange 14 has a concave zone near the inlet chamber 20 and then moving away from the hub 10 after an inflection zone, said inner face has a convex zone as previously described.
  • the path of the fluid in the channels defined by the flanges and blades in the centrifugal wheel 2 thus has an inflection.
  • the blades 16 extend into the curved zone (that is to say up to the concave zone of the inner face of the upstream flange and up to the convex zone of the inside face of the downstream flange) and guide the fluid preferably to the outlet 26.
  • the vanes 16 are thus also curved. They preferably extend from the inlet chamber 20 to the line H and the line S, or for example close to these lines (within 10 mm of these lines).

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

Abstract

This centrifugal rotor (2) comprises: - a hub (10) having a longitudinal axis (8), - a fluid inlet (20), - a first flange referred to as upstream flange (12) and having an opening (22) around the hub (10), - a second flange referred to as downstream flange (14) separated from the first flange by blades (16) thus forming ducts each delimited by the first flange (12), the second flange (14) and two blades (16) and extending from the fluid inlet (20) to a peripheral outlet (26), near the peripheral outlet (26) the first flange (12) having a concave zone (32) facing towards the ducts whereas the second flange (14) itself has a convex zone (34) facing towards the ducts.

Description

ROUE CENTRIFUGE  CENTRIFUGAL WHEEL
La présente invention concerne une roue centrifuge. The present invention relates to a centrifugal wheel.
Le domaine technique de la présente invention est celui de la compression de fluides, liquides ou gazeux. L'invention concerne alors aussi bien des pompes que des compresseurs qui permettent d'amener respectivement un liquide ou un gaz, d'une pression donnée à une pression plus élevée.  The technical field of the present invention is that of the compression of fluids, liquid or gaseous. The invention thus relates to both pumps that compressors that can respectively bring a liquid or a gas, a given pressure at a higher pressure.
Il existe de nombreuses techniques pour augmenter la pression d'un fluide. Une technique courante consiste à centrifuger le fluide sur lequel une contrainte est alors exercée provoquant une augmentation de sa pression. Pour la mise en œuvre de cette technique, il existe de nombreuses structures différentes de pompes et compresseurs en fonction de nombreux paramètres liés notamment au fluide, à l'environnement (encombrement, etc.) et aux performances souhaitées (taux de compression, etc.). Par la suite, on s'intéressera à des pompes ou compresseurs comportant au moins une roue centrifuge associée à un diffuseur axial.  There are many techniques for increasing the pressure of a fluid. A common technique is to centrifuge the fluid on which a stress is then exerted causing an increase in its pressure. For the implementation of this technique, there are many different structures of pumps and compressors according to many parameters related in particular to the fluid, the environment (size, etc.) and the desired performance (compression ratio, etc.). ). Subsequently, we will focus on pumps or compressors having at least one centrifugal wheel associated with an axial diffuser.
Une roue centrifuge est une roue présentant un axe de rotation. Elle est destinée à comprimer un fluide qui s'écoule selon une direction parallèle à son axe de rotation, le fluide comprimé sortant de la roue selon une direction radiale vers l'extérieur. Lorsque le fluide comprimé doit s'écouler axialement, une solution consiste à orienter le fluide en sortie de roue pour modifier le sens d'écoulement. L'élément utilisé à cet effet est une pièce fixe appelée diffuseur axial et qui comporte au moins un conduit pour orienter le fluide comprimé. L'extrémité aval du conduit, c'est-à-dire l'extrémité opposée à la roue centrifuge, est orientée axialement selon l'orientation que l'on souhaite donner à l'orientation du fluide comprimé. Le diffuseur axial a alors pour but de faire prendre un virage à environ 90° au fluide sortant de la roue centrifuge pour l'orienter axialement.  A centrifugal wheel is a wheel having an axis of rotation. It is intended to compress a fluid that flows in a direction parallel to its axis of rotation, the compressed fluid coming out of the wheel in a radially outward direction. When the compressed fluid must flow axially, one solution is to orient the fluid at the wheel outlet to change the direction of flow. The element used for this purpose is a fixed part called axial diffuser and which comprises at least one conduit for orienting the compressed fluid. The downstream end of the duct, that is to say the end opposite the centrifugal wheel, is oriented axially in the orientation that is desired to give the orientation of the compressed fluid. The axial diffuser then aims to make a turn about 90 ° to the fluid coming out of the centrifugal wheel to orient it axially.
Le document FR-2 874 241 divulgue une roue centrifuge à haut rendement utilisant des pales tronquées avec un diffuseur radial. Le sillage de la pale se referme dans le diffuseur et en coopération avec les autres sillages des pales adjacentes confectionne un écoulement stratifié qui se détend progressivement dans le diffuseur. On retrouve donc dans ce document une roue intégrant un diffuseur. Les aubages, très épais, sont localisés dans la partie basse de la roue. Document FR-2 874 241 discloses a high efficiency centrifugal wheel using blades truncated with a radial diffuser. The wake of the blade closes in the diffuser and in cooperation with the other wakes of the adjacent blades creates a laminated flow that relaxes gradually in the diffuser. We find in this document a wheel incorporating a diffuser. The blades, very thick, are located in the lower part of the wheel.
Le document US-1 ,447,916 illustre une autre forme de réalisation d'une roue intégrant un diffuseur. Ce dernier peut être d'une seule pièce avec la partie de la roue comportant des aubages ou bien être une pièce distincte solidarisée à la partie de la roue comportant des aubages. On remarque bien sur toutes les figures que les aubes illustrées ne s'étendent que sur une partie du dispositif (correspondant à la roue centrifuge) et non pas jusqu'à la sortie périphérique du dispositif et que la partie correspondant à la roue centrifuge présente une sortie parfaitement radiale en amont du diffuseur.  US-1,447,916 illustrates another embodiment of a wheel incorporating a diffuser. The latter may be in one piece with the portion of the wheel having vanes or be a separate piece secured to the portion of the wheel having vanes. It should be noted in all the figures that the vanes illustrated only extend over a part of the device (corresponding to the centrifugal wheel) and not up to the peripheral exit of the device and that the part corresponding to the centrifugal wheel has a perfectly radial outlet upstream of the diffuser.
Un problème technique que l'on rencontre avec une telle structure est qu'elle est source de pertes de charge pour le fluide comprimé. Il est en effet connu qu'un fluide, lorsqu'il s'écoule, subit des pertes de charge qui dépendent du conduit dans lequel il se trouve et notamment des changements de direction qu'il subit.  A technical problem that we encounter with such a structure is that it is a source of pressure drops for the compressed fluid. It is known that a fluid, when flowing, undergoes pressure losses that depend on the conduit in which it is located and in particular changes of direction that it undergoes.
Il n'est pas possible de supprimer les pertes de charges qui sont liées notamment à la nature même du fluide (notamment sa viscosité) mais la présente invention a pour but de fournir des moyens pour limiter autant que possible ces pertes de charge.  It is not possible to eliminate the pressure losses which are linked in particular to the nature of the fluid itself (in particular its viscosity), but the object of the present invention is to provide means for limiting as far as possible these pressure drops.
Un but de la présente invention est ainsi, pour un étage de compression donné, comportant une roue centrifuge et un diffuseur axial, d'augmenter les performances de cet étage, c'est-à-dire par exemple pour une puissance donnée obtenir un taux de compression supérieur ou bien pour une compression donnée pouvoir limiter la puissance mécanique nécessaire à exercer sur la roue pour la faire tourner.  An object of the present invention is thus, for a given compression stage, comprising a centrifugal wheel and an axial diffuser, to increase the performance of this stage, that is to say for example for a given power to obtain a rate higher compression or for a given compression being able to limit the mechanical power necessary to exert on the wheel to rotate it.
À cet effet, la présente invention propose une roue centrifuge comportant :  For this purpose, the present invention proposes a centrifugal wheel comprising:
- un moyeu présentant un axe longitudinal,  a hub having a longitudinal axis,
- une entrée de fluide,  a fluid inlet,
- un premier flasque dit flasque amont et présentant une ouverture autour du moyeu,  a first flange said flange upstream and having an opening around the hub,
- un second flasque dit flasque aval séparé du premier flasque par des aubes formant ainsi des canaux délimités chacun par le premier flasque, le second flasque et deux aubes et s'étendant depuis l'entrée de fluide jusqu'à une sortie périphérique. a second flange, said flange downstream, separated from the first flange by blades thus forming channels each delimited by the first flange, the second flange and two blades and extending from the fluid inlet to a peripheral outlet.
Selon la présente invention, à proximité de la sortie périphérique le premier flasque présente une zone concave orientée vers les canaux tandis que le second flasque présente quant à lui une zone convexe orientée vers les canaux.  According to the present invention, near the peripheral exit the first flange has a concave zone oriented towards the channels while the second flange has meanwhile a convex zone oriented towards the channels.
Grâce à la forme donnée ainsi aux canaux en sortie, le passage d'un flux radial au sein de la roue centrifuge à un flux axial dans le diffuseur en aval de la roue est réalisé moins brusquement permettant de limiter les pertes de charge lorsque le fluide change d'orientation.  Thanks to the shape thus given to the output channels, the passage of a radial flow within the centrifugal wheel to an axial flow in the diffuser downstream of the wheel is made less abruptly to limit the pressure losses when the fluid change of direction.
Pour avoir une roue plus simple à réaliser, le premier flasque et le second flasque présentent avantageusement une forme de révolution autour de l'axe longitudinal.  To have a simpler wheel to achieve, the first flange and the second flange advantageously have a form of revolution about the longitudinal axis.
On prévoit par exemple que la surface tangente à la zone concave du premier flasque en sortie de canal forme un angle compris entre 1 ° et 45°, de préférence entre 10° et 30°, avec un plan radial perpendiculaire à l'axe longitudinal. De même, on peut prévoir que la surface tangente à la zone convexe du second flasque en sortie de canal forme un angle compris entre 10 et 45°, de préférence entre 10° et 30°, avec un plan radial perpendiculaire à l'axe longitudinal. For example, it is provided that the surface tangent to the concave zone of the first flange at the outlet of the channel forms an angle of between 1 ° and 45 °, preferably between 10 ° and 30 °, with a radial plane perpendicular to the longitudinal axis. Similarly, it is expected that the surface tangent to the convex area of the second flange in channel outlet forms an angle of between 1 0 and 45 °, preferably between 10 ° and 30 ° with a radial plane perpendicular to the axis longitudinal.
Pour un meilleur guidage du fluide dans une roue centrifuge selon l'invention, il est avantageusement prévu que les aubes s'étendent jusqu'au bord périphérique extérieur du premier flasque et/ou du second flasque.  For better guidance of the fluid in a centrifugal wheel according to the invention, it is advantageously provided that the blades extend to the outer peripheral edge of the first flange and / or the second flange.
Pour créer localement une accélération du fluide sortant de la roue centrifuge, le premier flasque présente avantageusement un bord périphérique extérieur adjacent aux canaux de diamètre supérieur à celui d'un bord périphérique extérieur adjacent aux canaux du second flasque. Au niveau du bord de grand diamètre, qui correspond à l'extérieur de la forme incurvée donnée à la roue centrifuge en sortie de celle-ci, la vitesse est ainsi plus élevée. Ceci est préférable car la trajectoire à parcourir à l'extérieur d'un virage est plus grande que celle à l'intérieur d'un virage. De la sorte, on favorise une répartition de vitesse plus homogène lorsque le fluide se déplace ensuite selon une direction essentiellement longitudinale. To locally create an acceleration of the fluid leaving the centrifugal wheel, the first flange advantageously has an outer peripheral edge adjacent to the channels of diameter greater than that of an outer peripheral edge adjacent to the channels of the second flange. At the large diameter edge, which corresponds to the outside of the curved shape given to the centrifugal wheel at the output thereof, the speed is thus higher. This is preferable because the trajectory to be traveled outside a turn is greater than that inside a turn. In this way, a more homogeneous distribution of speed is favored when the fluid then moves according to an essentially longitudinal direction.
La présente invention concerne en outre également un compresseur centrifuge et/ou une pompe centrifuge qui comporte une roue centrifuge telle que décrite ci-dessus.  The present invention furthermore relates to a centrifugal compressor and / or a centrifugal pump which comprises a centrifugal wheel as described above.
Des détails et avantages de la présente invention apparaîtront mieux de la description qui suit, faite en référence au dessin schématique annexé sur lequel :  Details and advantages of the present invention will become more apparent from the description which follows, given with reference to the appended schematic drawing in which:
La figure 1 illustre une roue centrifuge de l'art antérieur par une vue en coupe d'une demie roue montée dans un compresseur,  FIG. 1 illustrates a centrifugal wheel of the prior art by a sectional view of a half wheel mounted in a compressor,
La figure 2 est une vue similaire à celle de la figure 1 pour une roue centrifuge selon une première forme de réalisation selon la présente invention, FIG. 2 is a view similar to that of FIG. 1 for a centrifugal wheel according to a first embodiment according to the present invention,
La figure 3 est une vue similaire aux précédentes pour une seconde forme de réalisation de la présente invention, et Fig. 3 is a view similar to the preceding for a second embodiment of the present invention, and
La figure 4 est une vue en perspective et en coupe selon la ligne de coupe IV-IV de la figure 2.  FIG. 4 is a perspective view in section along section line IV-IV of FIG. 2.
L'homme du métier reconnaît sur la figure 1 une roue centrifuge 2 montée à l'intérieur d'un corps 4, par exemple un corps de compresseur, et sur un arbre 6 qui présente un axe longitudinal 8. La description qui suit sera faite en référence à un compresseur travaillant avec de l'air (ou plus généralement des fluides gazeux) mais la présente invention peut également s'appliquer à des pompes destinées à des liquides.  The person skilled in the art recognizes in FIG. 1 a centrifugal wheel 2 mounted inside a body 4, for example a compressor body, and on a shaft 6 which has a longitudinal axis 8. The following description will be made with reference to a compressor working with air (or more generally gaseous fluids) but the present invention can also be applied to pumps for liquids.
Lorsque la roue centrifuge 2 est entraînée en rotation par l'arbre 6, de l'air (ou tout autre fluide gazeux) est aspiré à l'intérieur de la roue centrifuge 2 selon une direction longitudinale par rapport à l'axe longitudinal 8, est entraîné dans un mouvement hélico-centrifuge dans la roue centrifuge 2 en rotation et ressort radialement par rapport à l'axe longitudinal 8.  When the centrifugal wheel 2 is rotated by the shaft 6, air (or any other gaseous fluid) is sucked inside the centrifugal wheel 2 in a longitudinal direction with respect to the longitudinal axis 8, is driven in a helico-centrifugal movement in the centrifugal wheel 2 in rotation and spring radially with respect to the longitudinal axis 8.
La roue centrifuge 2 est réalisée d'une seule pièce et comporte un moyeu 10, un premier flasque ou flasque amont 12, un second flasque ou flasque aval 14 et des aubes 16.  The centrifugal wheel 2 is made in one piece and comprises a hub 10, a first flange or upstream flange 12, a second flange or downstream flange 14 and vanes 16.
Le moyeu 10 permet de réaliser une liaison entre l'arbre 6 et la roue centrifuge 2. Il présente une forme globale tubulaire cylindrique circulaire et est muni de moyens permettant de le solidariser avec l'arbre 6. On peut ainsi classiquement prévoir par exemple une rainure longitudinale dans le moyeu 10 et dans l'arbre 6 pour recevoir une clavette longitudinale ou bien des cannelures ou tout autre type de liaison. The hub 10 makes it possible to form a connection between the shaft 6 and the centrifugal wheel 2. It has a circular cylindrical overall cylindrical shape and is provided with means enabling it to be secured to the shaft 6. It is thus conventionally possible, for example, to provide a longitudinal groove in the hub 10 and in the shaft 6 to receive a longitudinal key or splines or any other type of connection.
Le flasque aval 14 est raccordé directement au moyeu 10 et s'étend radialement par rapport à l'axe longitudinal 8. L'orientation amont/aval est définie par rapport au sens de circulation de l'air dans la roue centrifuge 2. En effet, sur la figure 1 (ainsi que sur les autres figures) l'air est aspiré à droite de la roue puis se déplace longitudinalement vers la gauche avant d'être entraîné dans une direction radiale pour être enfin orienté, après être sorti de la roue centrifuge 2 dans une direction longitudinale à nouveau vers la gauche de la figure. Ainsi les éléments amont sont disposés à droite des éléments aval sur les figures.  The downstream flange 14 is connected directly to the hub 10 and extends radially with respect to the longitudinal axis 8. The upstream / downstream orientation is defined relative to the direction of air flow in the centrifugal wheel 2. Indeed , in Figure 1 (as well as in the other figures) the air is sucked to the right of the wheel then moves longitudinally to the left before being driven in a radial direction to be finally oriented, after being out of the wheel centrifuge 2 in a longitudinal direction again to the left of the figure. Thus the upstream elements are arranged to the right of the downstream elements in the figures.
Le flasque amont 12 fait face au flasque aval 14 et est relié à celui-ci par les aubes 16 définissant ainsi des canaux pour l'air entre les deux flasques. L'air est ainsi conduit entre les faces internes des flasques et les aubes de manière radiale centrifuge.  The upstream flange 12 faces the downstream flange 14 and is connected thereto by the blades 16 thus defining channels for air between the two flanges. The air is thus conducted between the inner faces of the flanges and the blades in a radial centrifugal manner.
Le flasque amont 12 ne s'étend pas jusqu'au moyeu 10 mais reste à distance de celui-ci. Il présente face au moyeu 10 un palier d'étanchéité 18 avant. Vers l'intérieur de la roue centrifuge 2, le palier d'étanchéité 18 avant définit avec le moyeu 10 une chambre d'entrée 20 avec une ouverture 22 annulaire en amont de la chambre d'entrée 20. Vers l'extérieur, le palier d'étanchéité 18 avant est usiné pour permettre de réaliser une étanchéité de la roue centrifuge 2 en rotation dans le corps 4. On utilise par exemple un joint d'étanchéité, tel par exemple une bague labyrinthe 24, comme interface entre la roue centrifuge 2 et le corps 4. Comme on peut le voir sur les figures, la roue centrifuge 2 comporte également du côté aval un autre palier d'étanchéité 18, ou palier d'étanchéité arrière, qui s'étend à partir du flasque aval 14 et reçoit une autre bague labyrinthe 24.  The upstream flange 12 does not extend to the hub 10 but remains at a distance from it. It has facing the hub 10 a sealing bearing 18 before. Towards the inside of the centrifugal wheel 2, the sealing bearing 18 before defines with the hub 10 an inlet chamber 20 with an annular opening 22 upstream of the inlet chamber 20. To the outside, the bearing sealing ring 18 is machined to make it possible to seal the centrifugal wheel 2 in rotation in the body 4. For example, a seal is used, such as for example a labyrinth ring 24, as interface between the centrifugal wheel 2 and the body 4. As can be seen in the figures, the centrifugal wheel 2 also has on the downstream side another sealing bearing 18, or rear sealing bearing, which extends from the downstream flange 14 and receives another labyrinth ring 24.
Les canaux conduisant l'air entre le flasque amont 12 et le flasque aval 14 présentent chacun une sortie 26 (figure 1) orientée radialement au niveau du plus grand diamètre des flasques. L'air entre ensuite dans un diffuseur 28 dans lequel il est guidé de manière à avoir un flux d'air non plus radial mais longitudinal. Des canaux 30 dans le diffuseur 28 permettent en outre de transformer le mouvement hélicoïdal du flux d'air en un mouvement sensiblement droit. The channels leading the air between the upstream flange 12 and the downstream flange 14 each have an outlet 26 (Figure 1) oriented radially at the largest diameter of the flanges. The air then enters a diffuser 28 in which it is guided in such a way as to have an air flow that is no longer radial but longitudinal. Channels 30 in the diffuser 28 also make it possible to transform the helical movement of the air flow into a movement substantially straight.
Les figures 2 et 4 illustrent une première forme de réalisation d'une roue centrifuge selon la présente invention. Comme il ressort du dessin, la structure globale est sensiblement la même sur la figure 1 et sur les figures 2 à 4. De ce fait, on utilise sur les figures 2 à 4 les références de la figure 1 pour désigner des éléments similaires. On retrouve ainsi une roue centrifuge 2 montée en rotation dans un corps 4 autour d'un arbre 6 d'axe longitudinal 8, l'étanchéité de la roue centrifuge 2 par rapport au corps 4 étant assurée notamment par des paliers d'étanchéité 18 coopérant avec des bagues labyrinthes 24 (ou autre type de joint d'étanchéité). Un moyeu 10 permet une liaison entre la roue et l'arbre 6, par exemple par l'intermédiaire d'une clavette non représentée. La roue centrifuge 2 comporte par ailleurs un flasque amont 12 et un flasque aval 14 reliés entre eux par des aubes 16. Le flasque amont 12 présente un palier d'étanchéité 18 qui définit avec le moyeu 10 une chambre d'entrée 20 d'ouverture 22 annulaire. Ici aussi, lorsque la roue centrifuge 2 tourne autour de l'axe longitudinal 8, de l'air (ou tout autre fluide) est aspiré par l'ouverture 22 (aspiration longitudinale) pour être comprimé dans un mouvement hélico-centrifuge puis être à nouveau orienté longitudinalement au sein d'un diffuseur 28 muni éventuellement de canaux.  Figures 2 and 4 illustrate a first embodiment of a centrifugal wheel according to the present invention. As can be seen from the drawing, the overall structure is substantially the same in FIG. 1 and in FIGS. 2 to 4. Therefore, in FIGS. 2 to 4, references in FIG. 1 are used to designate similar elements. There is thus a centrifugal wheel 2 mounted in rotation in a body 4 about a shaft 6 of longitudinal axis 8, the sealing of the centrifugal wheel 2 relative to the body 4 being ensured in particular by sealing bearings 18 cooperating with labyrinth rings 24 (or other type of seal). A hub 10 allows a connection between the wheel and the shaft 6, for example by means of a not shown key. The centrifugal wheel 2 further comprises an upstream flange 12 and a downstream flange 14 interconnected by blades 16. The upstream flange 12 has a sealing bearing 18 which defines with the hub 10 an inlet chamber 20 for opening 22 annular. Here too, when the centrifugal wheel 2 rotates about the longitudinal axis 8, air (or any other fluid) is sucked through the opening 22 (longitudinal suction) to be compressed in a helico-centrifugal movement and then to new longitudinally oriented within a diffuser 28 optionally provided with channels.
Les différences entre une roue de l'art antérieur et une roue centrifuge The differences between a wheel of the prior art and a centrifugal wheel
2 selon la présente invention se situent essentiellement au niveau des sorties 26, c'est-à-dire au niveau de la zone de plus grand diamètre du flasque amont 12, du flasque aval 14 et des aubes 16. 2 according to the present invention are essentially at the outlets 26, that is to say at the region of larger diameter of the upstream flange 12, the downstream flange 14 and blades 16.
Par rapport aux roues centrifuges connues de l'art antérieur d'un compresseur (ou d'une pompe), la présente invention propose de fournir en sortie de roue centrifuge un flux d'air (ou autre fluide) présentant un vecteur vitesse amélioré pour entrer dans le diffuseur longitudinal. À cet effet, il est prévu d'incurver légèrement les canaux d'air (définis par les flasques et les aubes) dans la roue centrifuge 2 à proximité des sorties 26. On réalise ainsi une courbure en sortie de la roue centrifuge qui permet d'augmenter la vitesse de l'air vers l'extérieur de la courbure.  Compared to the known centrifugal wheels of the prior art of a compressor (or a pump), the present invention proposes to provide at the outlet of the centrifugal wheel a flow of air (or other fluid) having an improved velocity vector for enter the longitudinal diffuser. For this purpose, it is planned to slightly bend the air channels (defined by the flanges and the blades) in the centrifugal wheel 2 near the outlets 26. This produces a curvature at the outlet of the centrifugal wheel which allows increase the air velocity outward of the curvature.
Alors que dans la forme de réalisation de la figure 1 on remarque que la face intérieure du flasque amont 12 et la face du flasque aval 14 sont sensiblement planes (et légèrement convergentes), la face intérieure du flasque amont 12 présente à proximité de la sortie 26 une zone concave 32 et la face intérieure du flasque aval 14 présente à proximité de la sortie 26, en vis- à-vis de la zone concave 32, une zone convexe 34. Whereas in the embodiment of FIG. 1, it can be seen that the inside face of the upstream flange 12 and the face of the downstream flange 14 are substantially flat (and slightly convergent), the inner face of the upstream flange 12 has near the outlet 26 a concave zone 32 and the inner face of the downstream flange 14 has near the outlet 26, vis-à-vis the concave zone 32, a convex zone 34.
Si l'on considère alors une surface tangente 36 à la face intérieure du flasque aval 14 au niveau de la sortie 26, cette surface sera sensiblement conique (cône d'axe l'axe longitudinal 8) et forme avec un plan radial illustré par une ligne en trait mixte un angle a. Dans la forme de réalisation de la figure 2, cet angle vaut environ 15° et il vaut environ 30° dans la forme de réalisation de la figure 3. De préférence, cet angle sera compris entre 10° et 45°. Dans les roues centrifuges de l'art antérieur, comme illustré par la figure 1 , cet angle est sensiblement nul.  If we then consider a tangent surface 36 to the inner face of the downstream flange 14 at the outlet 26, this surface will be substantially conical (axis cone the longitudinal axis 8) and form with a radial plane illustrated by a line in dotted line an angle a. In the embodiment of Figure 2, this angle is about 15 ° and is about 30 ° in the embodiment of Figure 3. Preferably, this angle will be between 10 ° and 45 °. In the centrifugal wheels of the prior art, as illustrated in FIG. 1, this angle is substantially zero.
Pour ne pas surcharger les figures, la surface tangente à la face intérieure du flasque amont 12 n'a pas été illustrée. On trouverait ici aussi une surface sensiblement conique, autour de l'axe longitudinal 8, qui forme avec le plan radial illustré un angle inférieur de préférence à 45°, par exemple compris entre 10 et 45°.  To avoid overloading the figures, the surface tangent to the inner face of the upstream flange 12 has not been illustrated. Here we would also find a substantially conical surface, around the longitudinal axis 8, which forms with the radial plane illustrated a lower angle preferably at 45 °, for example between 10 and 45 °.
La figure 4 illustre bien que les aubes 16 s'étendent jusque dans la zone convexe 34 du flasque aval 14. Bien entendu, elles s'étendent de manière similaire jusque dans la zone concave 32 du flasque amont 12. De préférence, comme illustré sur cette figure 4, les aubes 16 s'étendent jusqu'au bord périphérique du flasque amont 12 et du flasque aval 14, c'est-à-dire jusqu'aux sorties 26 de la roue.  FIG. 4 illustrates that the blades 16 extend into the convex zone 34 of the downstream flange 14. Of course, they extend in a similar manner into the concave zone 32 of the upstream flange 12. Preferably, as illustrated in FIG. 4, the blades 16 extend to the peripheral edge of the upstream flange 12 and the downstream flange 14, that is to say to the outlets 26 of the wheel.
Sur la figure 3, on a référencé par H la ligne de plus grand diamètre de la face intérieure du flasque aval 14 et par S la ligne de plus grand diamètre de la face intérieure du flasque amont 12. S et H sont des cercles, dont le centre se trouve sur l'axe longitudinal 8, respectivement de rayon Rs et RH. Comme il ressort de la figure 3 (c'est également visible sur la figure 2 mais légèrement moins prononcé), Rs > RH- Ainsi, pour une même vitesse moyenne sur la surface de sortie de l'air hors de la roue centrifuge 2, la vitesse périphérique de l'air à proximité du point S est supérieure à celle de l'air à proximité du point H. Il en va de même pour la vitesse tangentielle absolue. L'air est ainsi accéléré du côté amont (extérieur du "virage" en sortie de roue) permettant alors d'avoir une vitesse plus homogène à l'entrée d'une section sensiblement longitudinale du diffuseur. De ce fait, les pertes de charges, ne serait-ce qu'au sein du diffuseur, sont réduites et permettent donc d'augmenter le rendement du dispositif. In FIG. 3, the larger diameter line of the inside face of the downstream flange 14 is referenced by H, and the larger diameter line of the inside face of the upstream flange 14 by S. S and H are circles, of which the center is on the longitudinal axis 8, respectively of radius Rs and R H. As is apparent from Figure 3 (this is also visible in Figure 2 but slightly less pronounced), Rs> R H - Thus, for the same average speed on the air outlet surface out of the centrifugal wheel 2 , the peripheral velocity of the air near the point S is greater than that of the air near the point H. The same is true of the absolute tangential velocity. The air is thus accelerated on the upstream side (outside of the "turn" at the exit of the wheel) thus allowing to have a more homogeneous speed at the entrance of a substantially longitudinal section of the diffuser. As a result, the pressure drops, even if only within the diffuser, are reduced and thus make it possible to increase the efficiency of the device.
La forme de la roue centrifuge selon la présente invention permet ainsi un passage plus progressif d'un flux d'air radial vers un flux longitudinal. La répartition des vitesses du fluide au travers d'une section de passage du diffuseur est plus homogène et plus régulière. Les pertes de charge sont ainsi limitées et un gain en termes de rendement est ainsi obtenu à la fois lorsque le fluide passe d'un flux essentiellement radial à un flux axial et lors de son écoulement dans le diffuseur axial.  The shape of the centrifugal wheel according to the present invention thus allows a more gradual passage of a radial air flow to a longitudinal flow. The distribution of fluid velocities through a passage section of the diffuser is more homogeneous and more regular. The pressure losses are thus limited and a gain in terms of efficiency is thus obtained both when the fluid passes from a substantially radial flow to an axial flow and during its flow in the axial diffuser.
On remarque que les canaux dans la roue centrifuge 2 présentent un passage dans lequel le flux est sensiblement radial. Les faces intérieures du flasque amont et du flasque aval présentent chacune une inversion de courbure. Ainsi la face intérieure du flasque amont 12 présente une zone convexe à proximité de la chambre d'entrée 20 puis en s'éloignant du moyeu 10 après une zone d'inflexion, ladite face intérieure présente une zone concave comme décrit précédemment. À l'inverse, la face intérieure du flasque aval 14 présente une zone concave à proximité de la chambre d'entrée 20 puis en s'éloignant du moyeu 10 après une zone d'inflexion, ladite face intérieure présente une zone convexe comme décrit précédemment. La trajectoire du fluide dans les canaux définis par les flasques et les aubes au sein de la roue centrifuge 2 présente ainsi une inflexion.  Note that the channels in the centrifugal wheel 2 have a passage in which the flow is substantially radial. The inner faces of the upstream flange and the downstream flange each have a curvature inversion. Thus the inner face of the upstream flange 12 has a convex zone near the inlet chamber 20 and then away from the hub 10 after an inflection zone, said inner face has a concave zone as described above. In contrast, the inner face of the downstream flange 14 has a concave zone near the inlet chamber 20 and then moving away from the hub 10 after an inflection zone, said inner face has a convex zone as previously described. . The path of the fluid in the channels defined by the flanges and blades in the centrifugal wheel 2 thus has an inflection.
Pour mieux guider le fluide dans la roue incurvée, les aubes 16 s'étendent jusque dans la zone incurvée (c'est-à-dire jusqu'à la zone concave de la face intérieure du flasque amont et jusqu'à la zone convexe de la face intérieure du flasque aval) et guident le fluide de préférence jusqu'à la sortie 26. Les aubes 16 sont donc elles aussi incurvées. Elles s'étendent de préférence à partir de la chambre d'entrée 20 jusqu'à la ligne H et à la ligne S, ou par exemple jusqu'à proximité de ces lignes (à moins de 10 mm de ces lignes).  To better guide the fluid in the curved wheel, the blades 16 extend into the curved zone (that is to say up to the concave zone of the inner face of the upstream flange and up to the convex zone of the inside face of the downstream flange) and guide the fluid preferably to the outlet 26. The vanes 16 are thus also curved. They preferably extend from the inlet chamber 20 to the line H and the line S, or for example close to these lines (within 10 mm of these lines).
Bien entendu, la présente invention ne se limite pas à les formes de réalisation préférées décrites ci-dessus à titre d'exemples non limitatifs mais elle concerne également les variantes de réalisation à la portée de l'homme du métier dans le cadre des revendications ci-après. Of course, the present invention is not limited to the preferred embodiments described above as non-limiting examples but it also relates to the embodiments within the scope of those skilled in the art within the scope of the claims below.

Claims

REVENDICATIONS
1. Roue centrifuge (2) comportant :  1. Centrifugal wheel (2) comprising:
- un moyeu (10) présentant un axe longitudinal (8),  a hub (10) having a longitudinal axis (8),
- une entrée (20) de fluide,  a fluid inlet (20),
- un premier flasque dit flasque amont (12) et présentant une ouverture a first flange said flange upstream (12) and having an opening
(22) autour du moyeu (10), (22) around the hub (10),
- un second flasque dit flasque aval (14) séparé du premier flasque par des aubes (16) formant ainsi des canaux délimités chacun par le premier flasque (12), le second flasque (14) et deux aubes (16) et s'étendant depuis l'entrée (20) de fluide jusqu'à une sortie (26) périphérique,  - A second flange said downstream flange (14) separated from the first flange by vanes (16) thus forming channels each delimited by the first flange (12), the second flange (14) and two vanes (16) and extending from the fluid inlet (20) to a peripheral outlet (26),
caractérisée en ce que à proximité de la sortie (26) périphérique le premier flasque (12) présente une zone concave (32) orientée vers les canaux tandis que le second flasque (14) présente quant à lui une zone convexe (34) orientée vers les canaux.  characterized in that near the peripheral outlet (26) the first flange (12) has a concave zone (32) oriented towards the channels whereas the second flange (14) has a convex zone (34) oriented towards canals.
2. Roue centrifuge selon la revendication 1 , caractérisée en ce que le premier flasque (12) et le second flasque (14) présentent une forme de révolution autour de l'axe longitudinal.  2. Centrifugal wheel according to claim 1, characterized in that the first flange (12) and the second flange (14) have a shape of revolution about the longitudinal axis.
3. Roue centrifuge selon l'une des revendications 1 ou 2, caractérisée en ce que la surface tangente à la zone concave du premier flasque (12) en sortie de canal forme un angle compris entre 1 ° et 45° avec un plan radial perpendiculaire à l'axe longitudinal (8).  3. Centrifugal wheel according to one of claims 1 or 2, characterized in that the surface tangent to the concave region of the first flange (12) at the channel outlet forms an angle of between 1 ° and 45 ° with a perpendicular radial plane. to the longitudinal axis (8).
4. Roue centrifuge selon la revendication 3, caractérisée en ce que la surface tangente 36 à la zone concave du premier flasque en sortie de canal forme un angle compris entre 10° et 30° avec un plan radial perpendiculaire à l'axe longitudinal.  4. Centrifugal wheel according to claim 3, characterized in that the tangent surface 36 to the concave region of the first flange at the channel outlet forms an angle of between 10 ° and 30 ° with a radial plane perpendicular to the longitudinal axis.
5. Roue centrifuge selon l'une des revendications 1 à 4, caractérisée en ce que la surface tangente (36) à la zone convexe (34) du second flasque (14) en sortie de canal forme un angle compris entre 1 ° et 45° avec un plan radial perpendiculaire à l'axe longitudinal (8).  5. Centrifugal wheel according to one of claims 1 to 4, characterized in that the tangent surface (36) to the convex zone (34) of the second flange (14) at the channel outlet forms an angle of between 1 ° and 45 °. ° with a radial plane perpendicular to the longitudinal axis (8).
6. Roue centrifuge selon la revendication 5, caractérisée en ce que la surface tangente (36) à la zone convexe (34) du second flasque (14) en sortie de canal forme un angle compris entre 10° et 30° avec un plan radial perpendiculaire à l'axe longitudinal (8). 6. Centrifugal wheel according to claim 5, characterized in that the tangent surface (36) to the convex zone (34) of the second flange (14) at the channel outlet forms an angle between 10 ° and 30 ° with a radial plane. perpendicular to the longitudinal axis (8).
7. Roue centrifuge selon l'une des revendications 1 à 6, caractérisée en ce que les aubes (16) s'étendent jusqu'au bord périphérique (H, S) extérieur du premier flasque (12) et/ou du second flasque (14). Centrifugal wheel according to one of claims 1 to 6, characterized in that the blades (16) extend to the outer circumferential edge (H, S) of the first flange (12) and / or the second flange ( 14).
8. Roue centrifuge selon l'une des revendications 1 à 7, caractérisée en ce que le premier flasque (12) présente un bord périphérique (S) extérieur adjacent aux canaux de diamètre (Rs) supérieur à celui (RH) d'un bord périphérique (H) extérieur adjacent aux canaux du second flasque (14). 8. Centrifugal wheel according to one of claims 1 to 7, characterized in that the first flange (12) has an outer peripheral edge (S) adjacent to the channels of diameter (Rs) greater than that (R H ) of a outer peripheral edge (H) adjacent to the channels of the second flange (14).
9. Compresseur centrifuge, caractérisé en ce qu'il comporte une roue centrifuge (2) selon l'une des revendications 1 à 8.  9. Centrifugal compressor, characterized in that it comprises a centrifugal wheel (2) according to one of claims 1 to 8.
10. Pompe centrifuge, caractérisée en ce qu'elle comporte une roue centrifuge (2) selon l'une des revendications 1 à 8.  Centrifugal pump, characterized in that it comprises a centrifugal wheel (2) according to one of claims 1 to 8.
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FR3007086B1 (en) 2015-07-03
US20160146215A1 (en) 2016-05-26
FR3007086A1 (en) 2014-12-19
CA2915720A1 (en) 2014-12-24
JP2016522357A (en) 2016-07-28
EP3011185B1 (en) 2020-11-04
RU2019113490A (en) 2019-06-04
RU2019113490A3 (en) 2022-01-14
KR20160021229A (en) 2016-02-24
RU2015154050A (en) 2017-07-19
CN105518307A (en) 2016-04-20
CA2915720C (en) 2021-09-07
WO2014202903A1 (en) 2014-12-24

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