EP3532732B1 - Impeller for centrifugal pump, centrifugal pump and manufacturing method - Google Patents

Impeller for centrifugal pump, centrifugal pump and manufacturing method Download PDF

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Publication number
EP3532732B1
EP3532732B1 EP17793718.2A EP17793718A EP3532732B1 EP 3532732 B1 EP3532732 B1 EP 3532732B1 EP 17793718 A EP17793718 A EP 17793718A EP 3532732 B1 EP3532732 B1 EP 3532732B1
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EP
European Patent Office
Prior art keywords
hub
wheel
annular bead
rotor
axial direction
Prior art date
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EP17793718.2A
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German (de)
French (fr)
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EP3532732A1 (en
Inventor
Laurent Fabbri
Alban Lemaitre
Antoine Alain Gaston MERY
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ArianeGroup SAS
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ArianeGroup SAS
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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
    • F04D29/22—Rotors specially for centrifugal pumps
    • F04D29/2261—Rotors specially for centrifugal pumps with special measures
    • F04D29/2266—Rotors specially for centrifugal pumps with special measures for sealing or thrust balance
    • 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
    • F04D29/026—Selection of particular materials especially adapted for liquid 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
    • F04D29/04—Shafts or bearings, or assemblies thereof
    • F04D29/043—Shafts
    • 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
    • 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
    • F04D29/2277—Rotors specially for centrifugal pumps with special measures for increasing NPSH or dealing with liquids near boiling-point
    • 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
    • F05D2230/30—Manufacture with deposition of material

Definitions

  • This presentation relates to a centrifugal pump, in particular for a turbomachine.
  • the mass reduction is often done to the detriment of the mechanical resistance or the fatigue resistance of the various elements, so that each element is generally a compromise between the mass and the mechanical resistance of the element.
  • centrifugal This is the case, for example, of a centrifugal pump impeller which must have good hydraulic performance and also good mechanical strength on the shaft so that the torque can be transmitted from the rotating shaft to the pump impeller. centrifugal.
  • the wheel is typically shrunk on the shaft by an element of the wheel called the impeller tail which must ensure the correct transmission of the torque between the wheel and the shaft even at the high rotation speeds undergone by the wheel.
  • the centrifugal pump the centrifugal pump.
  • This presentation aims to provide a centrifugal pump whose mass is reduced compared to known centrifugal pumps and which has hydraulic performance and mechanical strength at least equivalent to known centrifugal pumps.
  • the present disclosure relates to an impeller for a centrifugal pump, according to claim 1, having an axial direction, the impeller comprising a hub, a veil having a shape of revolution comprising a fixing part of the veil with the hub, the veil flaring out from the fixing part in the axial direction, and an annular bead arranged between the veil and the hub, the annular bead being fixed to the veil while an annular space is provided between the hub and the annular bead.
  • the hub is not subjected to centrifugal force exerted by the web on the hub when the wheel is rotating. Also, when the wheel is rotating around the axial direction, the deformation undergone by the hub is relatively small and less significant than the deformation undergone by a hub to which a web would be directly attached.
  • the annular bead is arranged between a central axis of the wheel and the veil, the annular space being present between the annular bead, and therefore part of the veil, and the hub or a projection of the hub on the perpendicular plane.
  • annular bead fixed to the veil, between the veil and the hub.
  • This annular bead has a dimension in the axial direction which is greater than the thickness of the web, the thickness of the web being measured perpendicular to the main surfaces of the web.
  • This annular bead therefore makes it possible to limit the displacements in a radial direction at the outlet of the wheel and also makes it possible to control the displacements in the axial direction.
  • the annular bead corresponds to a thickening in the direction of ring-shaped material. It is understood that the shape and/or the dimensions of the annular bead can be modified in order to adapt the rotational behavior of the wheel, in particular as a function of the speeds of rotation in operation of the wheel. Indeed, if the maximum displacements in service along the radial and axial directions are of low amplitude, for example less than 100 ⁇ m, it is possible to reduce the dimensions of the annular bead.
  • the displacements in the radial and axial directions may depend for example on the diameter of the wheel, the speed of rotation, the intrinsic properties of the material in which the wheel is made, such as the density.
  • simulation software for example by finite elements
  • the veil flares out from the attachment part of the veil in the axial direction, there is a cavity formed between the hub, the veil and the annular bead. This cavity is at least open towards the outside due to the annular space provided between the hub and the annular bead. Therefore, the mass of the wheel is less than the mass of a wheel not having this open cavity.
  • the veil is attached to the hub by the attachment part of the veil and that the attachment part of the veil and of the hub forms the bottom of the open cavity, the bottom of the open cavity being disposed downstream of the annular space provided between the hub and the annular bead.
  • the wheel is made from a single piece, that is to say that the hub, the web and the bead are not assembled together.
  • the wheel can comprise an upstream end and a downstream end, the part for fixing the web with the hub being arranged at the upstream end of the wheel and the annular bead being arranged at the downstream end of the wheel.
  • upstream and downstream are defined with respect to the normal direction of circulation of the fluid in the centrifugal pump.
  • upstream end of the wheel is meant a part of the wheel located upstream of the wheel and whose dimension, in the axial direction, is less than or equal to 50% of the total length of the wheel, in the direction axial.
  • downstream end of the wheel means a part of the wheel located downstream of the wheel and whose dimension, in the axial direction, is less than or equal to 50% of the total length of the wheel, along the axial direction.
  • the hub may comprise an inner shrink-fit surface configured to shrink the hub on a shaft, the inner shrink-fit surface being arranged, at least in part, in the axial direction, in line with the annular space provided between the hub and the bead annular.
  • the inner hoop surface of the hub is arranged downstream of the disc so that the centrifugal forces exerted by the mass of the wheel on the inner surface of the hub , in particular by the end of the wheel furthest radially from the axis of rotation of the wheel, do not deform the inner hooping surface.
  • the inner shrink-fit surface being little or not deformed during the rotation of the wheel, the shrink-fit of the wheel on the shaft is facilitated.
  • the inside diameter of the inner hooping surface is dimensioned at rest taking into account the maximum deformation under stress undergone by the inner hooping surface. This deformation being small, the inside diameter of the inner hooping surface at rest is therefore slightly smaller than the inner diameter of the inner hooping surface during rotation of the wheel.
  • the effort required to assemble the shaft and the wheel is therefore limited compared to the effort required to assemble a wheel not comprising any annular space provided between the annular bead and the hub and whose difference in internal diameter of the internal shrinking surface between rest and rotation of the wheel is significant.
  • the maximum displacement in service can reach 0.2 mm in the shrinking zone, whereas with a wheel as defined above, the maximum displacement in service is only 0.02 mm in the shrinking zone.
  • the inner hooping surface can be substantially completely disposed, in the axial direction, in line with the annular space provided between the hub and the annular bead.
  • substantially completely disposed, in the axial direction, in line with the annular space provided between the hub and the annular bead it is meant that the inner hooping surface is included in the radial projection of the annular bead on the inner surface of the hub, plus or minus 5% the radial projection of the annular bead on the inner surface of the hub.
  • the inner hooping surface can be smaller in size than the radial projection of the annular bead on the inner surface of the hub but slightly exceed, by less than 5% of the dimension, in the axial direction of the annular bead.
  • the hub may comprise an inner shrink-fit surface (38) configured to shrink the hub on a shaft, the inner shrink-fit surface being arranged, in the axial direction, upstream of the annular space provided between the hub and the annular bead.
  • the wheel may include a plurality of reinforcing ribs arranged between the disc and the hub.
  • These reinforcing ribs make it possible to increase the mechanical strength of the wheel while limiting the overall mass of the wheel.
  • These reinforcing ribs can have a purely radial direction, they can also be inclined with respect to the radial direction. Thus, by modifying the number, the location and/or the dimensions of the reinforcing ribs, it is possible to modify the rigidity of the wheel.
  • These reinforcing ribs can also allow the transmission of the torque between the shaft and the wheel, in particular between the shaft and the disc of the wheel.
  • the web has a plurality of through holes.
  • the wheel comprises an inductor and an impeller and the through holes are arranged between the inductor and the impeller allowing orientation of the fluid in the axis of the flow.
  • the wheel can be made of metal or a metal alloy.
  • This presentation also relates to a centrifugal pump comprising an impeller as defined previously.
  • This presentation also relates to a method of manufacturing a wheel as defined previously, the wheel being produced by an additive manufacturing method.
  • This additive manufacturing process allows great flexibility in the shapes produced and also makes it easy to produce parts with cavities and/or internal ducts.
  • the figure 1 shows a view in axial section of a centrifugal pump 100 comprising a shaft 12, defining an axis X, on which are mounted an impeller 10, a bladed turbine distributor 116 and a turbine disc 102. These elements are included in a casing housing 104 which includes a front housing 106, a center housing 108 and an exhaust housing 110.
  • the pump housing 104 defines a pump volute 112 and a turbine inlet core 114.
  • the pump 100 also includes means for locking along the axis X of the elements of the pump 100 on the shaft 12. These elements are for example nuts 14 and 118.
  • the wheel 10 and the turbine disc 102 are mounted on the shaft 12 and in the pump casing 104 by bearings 18, the impeller 10 and the turbine disk 102 each being spaced from their respective bearing 18 by an adjusting wedge 16.
  • the figure 2A shows one embodiment of an impeller 10 for a centrifugal pump 100.
  • the arrow F represents the normal direction of circulation of a fluid in the centrifugal pump 100 and therefore around the impeller 10. Subsequently, the terms “upstream” and “downstream” are defined with respect to the normal direction of circulation of the fluid in the centrifugal pump.
  • the wheel 10 is shown mounted on the shaft 12. It is fixed on the shaft 12, at its upstream end, by the nut 14 and, at its downstream end, by the adjusting wedge 16 and the bearing 18.
  • the wheel 10 of the figure 2A includes an inductor 20 and an impeller 22.
  • Wheel 10 includes an axis of rotation X defining an axial direction X of wheel 10.
  • the wheel 10 comprises a hub 24 and a disc 26 having a shape of revolution comprising a fixing part 28 of the disc 26 with the hub 24.
  • the disc 24 flares out from the fixing part 28 in the axial direction X , that is to say that the veil 26 flares out from the fixing part 28, arranged at an upstream end of the wheel 10 towards a downstream end of the wheel 10.
  • the veil 26 has a first part of substantially cylindrical shape which then widens downstream of the wheel 10, so that a free end 26A of the veil extends substantially in a radial plane, that is to i.e. in a plane perpendicular to the axial direction X.
  • the wheel 10 also comprises an annular bead 30 arranged between the web 26 and the hub 24, at the downstream end of the wheel 10, to the right, in the axial direction X, of the free end 26A of the web 26.
  • the bead ring 30 is fixed to the web 26 while an annular space 32 is provided between the hub 24 and the annular bead 30.
  • the veil 26 flares out from the attachment part 28 of the veil 26 in the axial direction X, a cavity 34 is thus formed between the hub 24, the veil 26 and the annular bead 30.
  • This cavity 34 is at least open from the made of the annular space 32 provided between the hub 24 and the annular bead 30.
  • the hub 24 has an inner surface 36.
  • This inner surface 36 has a portion which forms an inner surface for hooping 38 of the hub 24 and therefore of the wheel 10 on the shaft 12.
  • This inner hooping surface 38 is arranged at the downstream end of the wheel 10.
  • the radial projection, that is to say in a radial direction R, of the section of the annular bead 30 on the hub 24, in particular on the inner surface 36 of the hub 24, defines a portion of the inner surface 36, according to the axial direction X, in line with the annular space 32 provided between the hub 24 and the annular bead 30.
  • the inner hooping surface 36 is arranged substantially completely, in the axial direction X, in line with the annular space 32 provided between the hub 24 and the annular bead 30.
  • the inner hooping surface 38 is included in the radial projection of the annular bead 30 on the inner surface 36 of the hub 24, plus or minus 5% the radial projection of the annular bead 30 on the inner surface 36 of the hub 24.
  • the inner hooping surface 38 may be smaller than the radial projection of the annular bead 30 on the inner surface 36 of the hub 24 but exceed slightly, by less than 5% of the dimension, in the axial direction X of the annular bead 30.
  • the wheel 10 comprises a plurality of reinforcing ribs 40 for reinforcement arranged between the web 26 and the hub 24 in the cavity 34. These radial ribs 40 are also visible on the figure 4 .
  • the veil 26 comprises a plurality of through holes 42 arranged between the inductor 20 and the impeller 22. These through holes 42 allow the passage of liquid from the upstream of the wheel 10 into the cavity 34. As shown in the figure 4 , each through hole 42 opens between two reinforcing ribs 40.
  • the inductor 20 comprises fins 44, in this embodiment the inductor 20 comprises four fins 44 and the impeller 22 comprises fins 46, in this embodiment the wheel comprises twelve fins 46.
  • reinforcing ribs 40 are also 12 in number and that they are arranged facing each other on either side of the web 26.
  • the inner surface 36 of the hub 24 comprises projections 48 also allowing the passage of torque between the shaft 12 and the hub 24.
  • the inner hooping surface 36 is arranged substantially completely, in the axial direction X, upstream of the annular space 32 provided between the hub 24 and the annular bead 30.
  • the wheel 10 is manufactured by an additive manufacturing process, for example by using a laser beam on a powder bed.
  • the powder bed is formed by the powder which will constitute the wheel 10.
  • the powder can comprise titanium or be made of a metal alloy commonly designated by the registered trademark Inconel TM . We then speak of Inconel to designate an iron-based alloy alloyed with nickel and chromium.
  • the wheel 10 is manufactured by superimposing layers in the axial direction X starting from its downstream end and ending with its upstream end.
  • the outer surfaces of the wheel 10 are then machined in a conventional and known manner so that the surface condition of the veil 26, of the fins 44, 46 and of the inner surface 36 of the hub conforms to the Specifications. On the other hand, it is not necessary to machine the surfaces of the cavity 34.
  • the number of fins 44 carried by the inductor 20 can vary, the same applies to the number of fins 46 carried by the impeller 22.
  • the number of reinforcing ribs 40 can be different from the number of fins 46 carried by impeller 22.
  • the number of through holes 42 may be different from the number of reinforcing ribs 40.
  • the fins 44, 46 are straight fins, these fins can also be inclined with respect to the radial direction, or even have a certain curvature.
  • the reinforcing ribs 40 shown are radial ribs. However, these ribs can also be inclined with respect to the radial direction, or even have a certain curvature.

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

Description

Le présent exposé concerne une pompe centrifuge, notamment pour turbomachine.This presentation relates to a centrifugal pump, in particular for a turbomachine.

Dans les moteurs de fusée, d'avion ou d'hélicoptère, un aspect important est la masse des différents éléments constitutifs du moteur.In rocket, airplane or helicopter engines, an important aspect is the mass of the various engine components.

Toutefois, la réduction de masse se fait souvent au détriment de la résistance mécanique ou de la résistance à la fatigue des différents éléments, si bien que chaque élément est généralement un compromis entre la masse et la tenue mécanique de l'élément.However, the mass reduction is often done to the detriment of the mechanical resistance or the fatigue resistance of the various elements, so that each element is generally a compromise between the mass and the mechanical resistance of the element.

C'est le cas par exemple d'une roue de pompe centrifuge qui doit avoir de bonnes performances hydrauliques et également une bonne tenue mécanique sur l'arbre afin que le couple puisse être transmis de l'arbre en rotation à la roue de la pompe centrifuge.This is the case, for example, of a centrifugal pump impeller which must have good hydraulic performance and also good mechanical strength on the shaft so that the torque can be transmitted from the rotating shaft to the pump impeller. centrifugal.

A cette fin, typiquement, la roue est frettée sur l'arbre par un élément de la roue appelé queue de rouet qui doit assurer la bonne transmission du couple entre la roue et l'arbre même aux vitesses élevées de rotation subies par la roue de la pompe centrifuge.To this end, the wheel is typically shrunk on the shaft by an element of the wheel called the impeller tail which must ensure the correct transmission of the torque between the wheel and the shaft even at the high rotation speeds undergone by the wheel. the centrifugal pump.

Aussi, lorsque certaines pièces ont plusieurs fonctions, on comprend que leur optimisation peut devenir difficile.Also, when certain parts have several functions, we understand that their optimization can become difficult.

Toutefois, on cherche encore à optimiser de telles pompes centrifuges afin notamment de réduire leur masse tout en conservant leurs performances hydrauliques et leur tenue mécanique. Des pompes de l'art antérieur sont décrites dans les documents US3589827 A , DE19918286 A1 et FR3008749 A1 .However, efforts are still being made to optimize such centrifugal pumps in order in particular to reduce their mass while retaining their hydraulic performance and their mechanical strength. Prior art pumps are described in documents US3589827A , DE19918286 A1 and FR3008749 A1 .

Objet et résumé de l'inventionSubject matter and summary of the invention

Le présent exposé vise à proposer une pompe centrifuge dont la masse est réduite par rapport aux pompes centrifuges connues et qui présente des performances hydrauliques et une tenue mécanique au moins équivalente aux pompes centrifuges connues.This presentation aims to provide a centrifugal pump whose mass is reduced compared to known centrifugal pumps and which has hydraulic performance and mechanical strength at least equivalent to known centrifugal pumps.

A cet effet, le présent exposé concerne une roue pour pompe centrifuge, selon la revendication 1, présentant une direction axiale, la roue comprenant un moyeu, un voile ayant une forme de révolution comprenant une partie de fixation du voile avec le moyeu, le voile s'évasant depuis la partie de fixation selon la direction axiale, et un bourrelet annulaire disposé entre le voile et le moyeu, le bourrelet annulaire étant fixé au voile tandis qu'un espace annulaire est ménagé entre le moyeu et le bourrelet annulaire.To this end, the present disclosure relates to an impeller for a centrifugal pump, according to claim 1, having an axial direction, the impeller comprising a hub, a veil having a shape of revolution comprising a fixing part of the veil with the hub, the veil flaring out from the fixing part in the axial direction, and an annular bead arranged between the veil and the hub, the annular bead being fixed to the veil while an annular space is provided between the hub and the annular bead.

Grâce à cet espace annulaire ménagé entre le moyeu et le bourrelet annulaire, le moyeu ne subit pas d'effort centrifuge exercé par le voile sur le moyeu lorsque la roue est en rotation. Aussi, lorsque la roue est en rotation autour de la direction axiale, la déformation subie par le moyeu est relativement faible et moins importante que la déformation subie par un moyeu sur lequel un voile serait directement attaché.Thanks to this annular space provided between the hub and the annular bead, the hub is not subjected to centrifugal force exerted by the web on the hub when the wheel is rotating. Also, when the wheel is rotating around the axial direction, the deformation undergone by the hub is relatively small and less significant than the deformation undergone by a hub to which a web would be directly attached.

On comprend donc que dans un plan perpendiculaire à la direction axiale passant par le voile et le bourrelet annulaire, le bourrelet annulaire est disposé entre un axe central de la roue et le voile, l'espace annulaire étant présent entre le bourrelet annulaire, et donc une partie du voile, et le moyeu ou une projection du moyeu sur le plan perpendiculaire.It is therefore understood that in a plane perpendicular to the axial direction passing through the veil and the annular bead, the annular bead is arranged between a central axis of the wheel and the veil, the annular space being present between the annular bead, and therefore part of the veil, and the hub or a projection of the hub on the perpendicular plane.

Par ailleurs, l'intégrité structurelle du voile et de la roue est assurée par la présence du bourrelet annulaire fixé sur le voile, entre le voile et le moyeu. Ce bourrelet annulaire présente une dimension selon la direction axiale qui est supérieure à l'épaisseur du voile, l'épaisseur du voile étant mesurée perpendiculairement aux surfaces principales du voile.Furthermore, the structural integrity of the veil and of the wheel is ensured by the presence of the annular bead fixed to the veil, between the veil and the hub. This annular bead has a dimension in the axial direction which is greater than the thickness of the web, the thickness of the web being measured perpendicular to the main surfaces of the web.

Ce bourrelet annulaire permet donc de limiter les déplacements selon une direction radiale en sortie de la roue et permet également de contrôler les déplacements selon la direction axiale. Le bourrelet annulaire correspond à un épaississement dans la direction de matière en forme d'anneau. On comprend que l'on peut modifier la forme et/ou les dimensions du bourrelet annulaire afin d'adapter le comportement en rotation de la roue, notamment en fonction des vitesses de rotation en fonctionnement de la roue. En effet, si les déplacements maximaux en service selon les directions radiales et axiales sont de faible amplitude, par exemple inférieurs à 100 µm, il est possible de réduire les dimensions du bourrelet annulaire. Les déplacements selon les directions radiales et axiales peuvent dépendre par exemple du diamètre de la roue, de la vitesse de rotation, des propriétés intrinsèques du matériau dans lequel la roue est réalisée, telles que la densité. Cependant, notamment grâce à des logiciels de simulation (par exemple par éléments finis), il est possible de modifier la forme et/ou les dimensions du bourrelet annulaire.This annular bead therefore makes it possible to limit the displacements in a radial direction at the outlet of the wheel and also makes it possible to control the displacements in the axial direction. The annular bead corresponds to a thickening in the direction of ring-shaped material. It is understood that the shape and/or the dimensions of the annular bead can be modified in order to adapt the rotational behavior of the wheel, in particular as a function of the speeds of rotation in operation of the wheel. Indeed, if the maximum displacements in service along the radial and axial directions are of low amplitude, for example less than 100 μm, it is possible to reduce the dimensions of the annular bead. The displacements in the radial and axial directions may depend for example on the diameter of the wheel, the speed of rotation, the intrinsic properties of the material in which the wheel is made, such as the density. However, in particular thanks to simulation software (for example by finite elements), it is possible to modify the shape and/or the dimensions of the annular bead.

Le voile s'évasant depuis la partie d'attache du voile selon la direction axiale, il existe une cavité formée entre le moyeu, le voile et le bourrelet annulaire. Cette cavité est au moins ouverte vers l'extérieur du fait de l'espace annulaire ménagé entre le moyeu et le bourrelet annulaire. De ce fait, la masse de la roue est inférieure à la masse d'une roue ne présentant pas cette cavité ouverte.Since the veil flares out from the attachment part of the veil in the axial direction, there is a cavity formed between the hub, the veil and the annular bead. This cavity is at least open towards the outside due to the annular space provided between the hub and the annular bead. Therefore, the mass of the wheel is less than the mass of a wheel not having this open cavity.

On comprend que le voile est attaché au moyeu par la partie d'attache du voile et que la partie d'attache du voile et du moyeu forme le fond de la cavité ouverte, le fond de la cavité ouverte étant disposé en aval de l'espace annulaire ménagé entre le moyeu et le bourrelet annulaire.It is understood that the veil is attached to the hub by the attachment part of the veil and that the attachment part of the veil and of the hub forms the bottom of the open cavity, the bottom of the open cavity being disposed downstream of the annular space provided between the hub and the annular bead.

On comprend que la roue est faite d'une seule pièce, c'est-à-dire que le moyeu, le voile et le bourrelet ne sont pas assemblés les uns aux autres.It is understood that the wheel is made from a single piece, that is to say that the hub, the web and the bead are not assembled together.

La roue peut comprendre une extrémité amont et une extrémité aval, la partie de fixation du voile avec le moyeu étant disposé à l'extrémité amont de la roue et le bourrelet annulaire étant disposé à l'extrémité aval de la roue.The wheel can comprise an upstream end and a downstream end, the part for fixing the web with the hub being arranged at the upstream end of the wheel and the annular bead being arranged at the downstream end of the wheel.

Par la suite, les termes « amont » et « aval » sont définis par rapport au sens de circulation normal du fluide dans la pompe centrifuge.Subsequently, the terms “upstream” and “downstream” are defined with respect to the normal direction of circulation of the fluid in the centrifugal pump.

On entend par extrémité amont de la roue, une partie de la roue située à l'amont de la roue et dont la dimension, selon la direction axiale, est inférieure ou égale à 50% de la longueur totale de la roue, selon la direction axiale. De même, on entend par extrémité aval de la roue, une partie de la roue située à l'aval de la roue et dont la dimension, selon la direction axiale, est inférieure ou égale à 50% de la longueur totale de la roue, selon la direction axiale.By upstream end of the wheel is meant a part of the wheel located upstream of the wheel and whose dimension, in the axial direction, is less than or equal to 50% of the total length of the wheel, in the direction axial. Likewise, the downstream end of the wheel means a part of the wheel located downstream of the wheel and whose dimension, in the axial direction, is less than or equal to 50% of the total length of the wheel, along the axial direction.

Le moyeu peut comporter une surface intérieure de frettage configurée pour fretter le moyeu sur un arbre, la surface intérieure de frettage étant disposée, au moins en partie, selon la direction axiale, au droit de l'espace annulaire ménagé entre le moyeu et le bourrelet annulaire.The hub may comprise an inner shrink-fit surface configured to shrink the hub on a shaft, the inner shrink-fit surface being arranged, at least in part, in the axial direction, in line with the annular space provided between the hub and the bead annular.

On comprend que dans une vue en coupe axiale de la roue, lorsque l'on projette la section du bourrelet annulaire sur la surface intérieure du moyeu selon une direction radiale, on définit une section de la surface intérieure du moyeu qui est, selon la direction axiale, au droit de l'espace annulaire ménagé entre le moyeu et le bourrelet annulaire et donc, selon la direction axiale, au droit du bourrelet annulaire.It is understood that in an axial sectional view of the wheel, when the section of the annular bead is projected onto the inner surface of the hub in a radial direction, a section of the inner surface of the hub is defined which is, in the direction axial, right of the annular space provided between the hub and the annular bead and therefore, in the axial direction, in line with the annular bead.

De ce fait, même lorsque la roue est montée sur l'arbre et tourne à grande vitesse, le frettage entre l'arbre et le moyeu subit peu ou pas de déformations.As a result, even when the wheel is mounted on the shaft and rotating at high speed, the shrink fit between the shaft and the hub undergoes little or no deformation.

Aussi, contrairement aux roues connues, il n'est plus nécessaire de prévoir une queue de rouet aussi longue selon la direction axiale et décalée par rapport au voile vers l'aval de la roue selon la direction axiale. En effet, dans des roues ne présentant pas d'espace annulaire ménagé autour du moyeu, la surface intérieure de frettage du moyeu est disposée en aval du voile de sorte que les forces centrifuges exercées par la masse de la roue sur la surface intérieure du moyeu, en particulier par l'extrémité de la roue la plus éloignée radialement de l'axe de rotation de la roue, ne déforment pas la surface intérieure de frettage.Also, unlike known wheels, it is no longer necessary to provide a wheel tail that is as long in the axial direction and offset with respect to the web downstream of the wheel in the axial direction. In fact, in wheels that do not have an annular space provided around the hub, the inner hoop surface of the hub is arranged downstream of the disc so that the centrifugal forces exerted by the mass of the wheel on the inner surface of the hub , in particular by the end of the wheel furthest radially from the axis of rotation of the wheel, do not deform the inner hooping surface.

Il est donc possible de déplacer la surface de frettage vers l'amont de la roue. On peut ainsi réduire la longueur de la queue de rouet, réduire la masse de la roue et son encombrement, c'est-à-dire la dimension totale de la roue selon la direction axiale. De ce fait, le gain en masse va au-delà du gain en masse de la roue. En effet, on peut également réduire la masse des carters de la pompe centrifuge ainsi que la masse des carters entourant la pompe centrifuge.It is therefore possible to move the hooping surface upstream of the wheel. It is thus possible to reduce the length of the wheel tail, reduce the mass of the wheel and its size, that is to say the total dimension of the wheel in the axial direction. Therefore, the gain in mass goes beyond the gain in mass of the wheel. Indeed, it is also possible to reduce the mass of the casings of the centrifugal pump as well as the mass of the casings surrounding the centrifugal pump.

Par ailleurs, la surface intérieure de frettage étant peu ou pas déformée lors de la rotation de la roue, le frettage de la roue sur l'arbre est facilité. En effet, le diamètre intérieur de la surface intérieure de frettage est dimensionné au repos en tenant compte de la déformation maximale sous effort subie par la surface intérieure de frettage. Cette déformation étant faible, le diamètre intérieur de la surface intérieure de frettage au repos est donc légèrement plus petit que le diamètre intérieur de la surface intérieure de frettage lors de la rotation de la roue. L'effort requis pour assembler l'arbre et la roue est donc limité par rapport à l'effort nécessaire pour assembler une roue ne comportant pas d'espace annulaire ménagé entre le bourrelet annulaire et le moyeu et dont la différence de diamètre intérieur de la surface intérieure de frettage entre le repos et la rotation de la roue est significative. Par exemple, pour un moyeu présentant un diamètre de 27 mm (millimètre), avec une roue classique, le déplacement maximal en service peut atteindre 0.2 mm dans la zone de frettage, alors qu'avec une roue telle que définie ci-dessus, le déplacement maximal en service n'est que de 0.02 mm dans la zone de frettage.Furthermore, the inner shrink-fit surface being little or not deformed during the rotation of the wheel, the shrink-fit of the wheel on the shaft is facilitated. Indeed, the inside diameter of the inner hooping surface is dimensioned at rest taking into account the maximum deformation under stress undergone by the inner hooping surface. This deformation being small, the inside diameter of the inner hooping surface at rest is therefore slightly smaller than the inner diameter of the inner hooping surface during rotation of the wheel. The effort required to assemble the shaft and the wheel is therefore limited compared to the effort required to assemble a wheel not comprising any annular space provided between the annular bead and the hub and whose difference in internal diameter of the internal shrinking surface between rest and rotation of the wheel is significant. For example, for a hub with a diameter of 27 mm (millimetre), with a conventional wheel, the maximum displacement in service can reach 0.2 mm in the shrinking zone, whereas with a wheel as defined above, the maximum displacement in service is only 0.02 mm in the shrinking zone.

La surface intérieure de frettage peut être sensiblement complètement disposée, selon la direction axiale, au droit de l'espace annulaire ménagé entre le moyeu et le bourrelet annulaire.The inner hooping surface can be substantially completely disposed, in the axial direction, in line with the annular space provided between the hub and the annular bead.

On peut donc concevoir une roue ne comprenant pas de queue de rouet.It is therefore possible to design a wheel that does not include a wheel tail.

Par sensiblement complètement disposée, selon la direction axiale, au droit de l'espace annulaire ménagé entre le moyeu et le bourrelet annulaire, on entend que la surface intérieure de frettage est comprise dans la projection radiale du bourrelet annulaire sur la surface intérieure du moyeu, à plus ou moins 5% la projection radiale du bourrelet annulaire sur la surface intérieure du moyeu.By substantially completely disposed, in the axial direction, in line with the annular space provided between the hub and the annular bead, it is meant that the inner hooping surface is included in the radial projection of the annular bead on the inner surface of the hub, plus or minus 5% the radial projection of the annular bead on the inner surface of the hub.

Ainsi, la surface intérieure de frettage peut être de dimension inférieure à la projection radiale du bourrelet annulaire sur la surface intérieure du moyeu mais dépasser légèrement, de moins de 5% de la dimension, selon la direction axiale du bourrelet annulaire.Thus, the inner hooping surface can be smaller in size than the radial projection of the annular bead on the inner surface of the hub but slightly exceed, by less than 5% of the dimension, in the axial direction of the annular bead.

Le moyeu peut comporter une surface intérieure de frettage (38) configurée pour fretter le moyeu sur un arbre, la surface intérieure de frettage étant disposée, selon la direction axiale, en amont de l'espace annulaire ménagé entre le moyeu et le bourrelet annulaire.The hub may comprise an inner shrink-fit surface (38) configured to shrink the hub on a shaft, the inner shrink-fit surface being arranged, in the axial direction, upstream of the annular space provided between the hub and the annular bead.

On peut ainsi réduire la masse de la roue.It is thus possible to reduce the mass of the wheel.

La roue peut comporter une pluralité de nervures de renforcement disposées entre le voile et le moyeu.The wheel may include a plurality of reinforcing ribs arranged between the disc and the hub.

Ces nervures de renforcement permettent d'accroître la tenue mécanique de la roue tout en limitant la masse globale de la roue. Ces nervures de renforcement peuvent avoir une direction purement radiale, elles peuvent également être inclinées par rapport à la direction radiale. Ainsi, en modifiant le nombre, l'emplacement et/ou les dimensions des nervures de renforcement, il est possible de modifier la rigidité de la roue. Ces nervures de renforcement peuvent également permettre la transmission du couple entre l'arbre et la roue, en particulier entre l'arbre et le voile de la roue.These reinforcing ribs make it possible to increase the mechanical strength of the wheel while limiting the overall mass of the wheel. These reinforcing ribs can have a purely radial direction, they can also be inclined with respect to the radial direction. Thus, by modifying the number, the location and/or the dimensions of the reinforcing ribs, it is possible to modify the rigidity of the wheel. These reinforcing ribs can also allow the transmission of the torque between the shaft and the wheel, in particular between the shaft and the disc of the wheel.

Le voile comporte une pluralité d'orifices traversants.The web has a plurality of through holes.

Ces orifices traversant permettent un équilibrage de pression entre une surface amont du voile et une surface aval du voile. On peut ainsi équilibrer les efforts sur l'arbre en amont et en aval de la roue et ainsi réduire les efforts subits par des butées de la pompe centrifuge.These through orifices allow pressure balancing between an upstream surface of the veil and a downstream surface of the veil. It is thus possible to balance the forces on the shaft upstream and downstream of the impeller and thus reduce the forces undergone by the stops of the centrifugal pump.

La roue comprend un inducteur et un impulseur et les orifices traversants sont disposés entre l'inducteur et l'impulseur permettant une orientation du fluide dans l'axe de l'écoulement.The wheel comprises an inductor and an impeller and the through holes are arranged between the inductor and the impeller allowing orientation of the fluid in the axis of the flow.

La roue peut être réalisée en métal ou en alliage métallique.The wheel can be made of metal or a metal alloy.

Le présent exposé concerne également une pompe centrifuge comprenant une roue telle que définie précédemment.This presentation also relates to a centrifugal pump comprising an impeller as defined previously.

Le présent exposé concerne aussi un procédé de fabrication d'une roue tel que défini précédemment, la roue étant réalisé par un procédé de fabrication additive.This presentation also relates to a method of manufacturing a wheel as defined previously, the wheel being produced by an additive manufacturing method.

Ce procédé de fabrication additive permet une grande souplesse dans les formes produites et permet également de réaliser de manière aisée des pièces présentant des cavités et/ou des conduits internes.This additive manufacturing process allows great flexibility in the shapes produced and also makes it easy to produce parts with cavities and/or internal ducts.

Brève description des dessinsBrief description of the drawings

D'autres caractéristiques et avantages de l'invention ressortiront de la description suivante de modes de réalisation de l'invention, donnés à titre d'exemples non limitatifs, en référence aux figures annexées, sur lesquelles :

  • la figure 1 est une vue schématique en coupe axiale d'une pompe centrifuge ;
  • les figures 2A et 2B sont des vues en coupe axiale d'une roue pour une pompe centrifuge selon deux modes de réalisation ;
  • la figure 3 est une vue en perspective de la roue de la figure 2A, vu du côté amont ; et
  • la figure 4 est une vue partielle en perspective de la roue de la figure 2A, vu du côté aval.
Other characteristics and advantages of the invention will emerge from the following description of embodiments of the invention, given by way of non-limiting examples, with reference to the appended figures, in which:
  • the figure 1 is a schematic view in axial section of a centrifugal pump;
  • the figure 2A and 2B are views in axial section of an impeller for a centrifugal pump according to two embodiments;
  • the picture 3 is a perspective view of the wheel of the figure 2A , seen from the upstream side; and
  • the figure 4 is a partial perspective view of the wheel of the figure 2A , seen from the downstream side.

Description détaillée de l'inventionDetailed description of the invention

La figure 1 représente une vue en coupe axiale d'une pompe centrifuge 100 comprenant un arbre 12, définissant un axe X, sur lequel sont monté une roue 10, un distributeur de turbine aubé 116 et un disque de turbine 102. Ces éléments sont compris dans un carter de pompe 104 qui comporte un carter avant 106, un carter central 108 et un carter d'échappement 110. Le carter de pompe 104 définit une volute de pompe 112 et un tore d'admission de turbine 114.The figure 1 shows a view in axial section of a centrifugal pump 100 comprising a shaft 12, defining an axis X, on which are mounted an impeller 10, a bladed turbine distributor 116 and a turbine disc 102. These elements are included in a casing housing 104 which includes a front housing 106, a center housing 108 and an exhaust housing 110. The pump housing 104 defines a pump volute 112 and a turbine inlet core 114.

La pompe 100 comporte également des moyens de blocage selon l'axe X des éléments de la pompe 100 sur l'arbre 12. Ces éléments sont par exemple des écrous 14 et 118. La roue 10 et le disque de turbine 102 sont montés sur l'arbre 12 et dans le carter de pompe 104 par des roulements 18, la roue 10 et le disque de turbine 102 étant chacun espacé de leur roulement 18 respectif par une cale de réglage 16.The pump 100 also includes means for locking along the axis X of the elements of the pump 100 on the shaft 12. These elements are for example nuts 14 and 118. The wheel 10 and the turbine disc 102 are mounted on the shaft 12 and in the pump casing 104 by bearings 18, the impeller 10 and the turbine disk 102 each being spaced from their respective bearing 18 by an adjusting wedge 16.

La figure 2A représente un mode de réalisation d'une roue 10 pour une pompe centrifuge 100. Sur la figure 2A, la flèche F représente le sens de circulation normal d'un fluide dans la pompe centrifuge 100 et donc autour de la roue 10. Par la suite, les termes « amont » et « aval » sont définis par rapport au sens de circulation normal du fluide dans la pompe centrifuge.The figure 2A shows one embodiment of an impeller 10 for a centrifugal pump 100. On the figure 2A , the arrow F represents the normal direction of circulation of a fluid in the centrifugal pump 100 and therefore around the impeller 10. Subsequently, the terms “upstream” and “downstream” are defined with respect to the normal direction of circulation of the fluid in the centrifugal pump.

La roue 10 est représenté montée sur l'arbre 12. Elle est fixée sur l'arbre 12, à son extrémité amont, par l'écrou 14 et, à son extrémité aval, par la cale de réglage 16 et le roulement 18.The wheel 10 is shown mounted on the shaft 12. It is fixed on the shaft 12, at its upstream end, by the nut 14 and, at its downstream end, by the adjusting wedge 16 and the bearing 18.

D'une manière générale, la roue 10 de la figure 2A comprend un inducteur 20 et un impulseur 22.In general, the wheel 10 of the figure 2A includes an inductor 20 and an impeller 22.

La roue 10 comprend un axe de rotation X définissant une direction axiale X de la roue 10.Wheel 10 includes an axis of rotation X defining an axial direction X of wheel 10.

La roue 10 comprend un moyeu 24 et un voile 26 ayant une forme de révolution comprenant une partie de fixation 28 du voile 26 avec le moyeu 24. Comme représenté, le voile 24 s'évase depuis la partie de fixation 28 selon la direction axiale X, c'est-à-dire que le voile 26 s'évase depuis la partie de fixation 28, disposée à une extrémité amont de la roue 10 vers une extrémité aval de la roue 10. Sur la figure 2A, le voile 26 a une première partie de forme sensiblement cylindrique qui s'évase ensuite vers l'aval de la roue 10, de sorte qu'une extrémité libre 26A du voile s'étend sensiblement dans un plan radial, c'est-à-dire dans un plan perpendiculaire à la direction axiale X.The wheel 10 comprises a hub 24 and a disc 26 having a shape of revolution comprising a fixing part 28 of the disc 26 with the hub 24. As shown, the disc 24 flares out from the fixing part 28 in the axial direction X , that is to say that the veil 26 flares out from the fixing part 28, arranged at an upstream end of the wheel 10 towards a downstream end of the wheel 10. On the figure 2A , the veil 26 has a first part of substantially cylindrical shape which then widens downstream of the wheel 10, so that a free end 26A of the veil extends substantially in a radial plane, that is to i.e. in a plane perpendicular to the axial direction X.

La roue 10 comprend également un bourrelet annulaire 30 disposé entre le voile 26 et le moyeu 24, à l'extrémité aval de la roue 10, au droit, selon la direction axiale X, de l'extrémité libre 26A du voile 26. Le bourrelet annulaire 30 est fixé au voile 26 tandis qu'un espace annulaire 32 est ménagé entre le moyeu 24 et le bourrelet annulaire 30.The wheel 10 also comprises an annular bead 30 arranged between the web 26 and the hub 24, at the downstream end of the wheel 10, to the right, in the axial direction X, of the free end 26A of the web 26. The bead ring 30 is fixed to the web 26 while an annular space 32 is provided between the hub 24 and the annular bead 30.

Le voile 26 s'évasant depuis la partie d'attache 28 du voile 26 selon la direction axiale X, une cavité 34 est ainsi formée entre le moyeu 24, le voile 26 et le bourrelet annulaire 30. Cette cavité 34 est au moins ouverte du fait de l'espace annulaire 32 ménagé entre le moyeu 24 et le bourrelet annulaire 30.The veil 26 flares out from the attachment part 28 of the veil 26 in the axial direction X, a cavity 34 is thus formed between the hub 24, the veil 26 and the annular bead 30. This cavity 34 is at least open from the made of the annular space 32 provided between the hub 24 and the annular bead 30.

Par ailleurs, dans le mode de réalisation de la figure 2A, le moyeu 24 présente une surface intérieure 36. Cette surface intérieure 36 comporte une portion qui forme une surface intérieure de frettage 38 du moyeu 24 et donc de la roue 10 sur l'arbre 12. Cette surface intérieure de frettage 38 est disposée à l'extrémité aval de la roue 10.Furthermore, in the embodiment of the figure 2A , the hub 24 has an inner surface 36. This inner surface 36 has a portion which forms an inner surface for hooping 38 of the hub 24 and therefore of the wheel 10 on the shaft 12. This inner hooping surface 38 is arranged at the downstream end of the wheel 10.

La projection radiale, c'est-à-dire selon une direction radiale R, de la section du bourrelet annulaire 30 sur le moyeu 24, en particulier sur la surface intérieure 36 du moyeu 24, définit une portion de la surface intérieure 36, selon la direction axiale X, au droit de l'espace annulaire 32 ménagé entre le moyeu 24 et le bourrelet annulaire 30.The radial projection, that is to say in a radial direction R, of the section of the annular bead 30 on the hub 24, in particular on the inner surface 36 of the hub 24, defines a portion of the inner surface 36, according to the axial direction X, in line with the annular space 32 provided between the hub 24 and the annular bead 30.

Dans le mode de réalisation de la figure 2A, la surface intérieure de frettage 36 est disposée sensiblement complètement, selon la direction axiale X, au droit de l'espace annulaire 32 ménagé entre le moyeu 24 et le bourrelet annulaire 30.In the embodiment of the figure 2A , the inner hooping surface 36 is arranged substantially completely, in the axial direction X, in line with the annular space 32 provided between the hub 24 and the annular bead 30.

La surface intérieure de frettage 38 est comprise dans la projection radiale du bourrelet annulaire 30 sur la surface intérieure 36 du moyeu 24, à plus ou moins 5% la projection radiale du bourrelet annulaire 30 sur la surface intérieure 36 du moyeu 24. Ainsi, la surface intérieure de frettage 38 peut être de dimension inférieure à la projection radiale du bourrelet annulaire 30 sur la surface intérieure 36 du moyeu 24 mais dépasser légèrement, de moins de 5% de la dimension, selon la direction axiale X du bourrelet annulaire 30.The inner hooping surface 38 is included in the radial projection of the annular bead 30 on the inner surface 36 of the hub 24, plus or minus 5% the radial projection of the annular bead 30 on the inner surface 36 of the hub 24. Thus, the inner hooping surface 38 may be smaller than the radial projection of the annular bead 30 on the inner surface 36 of the hub 24 but exceed slightly, by less than 5% of the dimension, in the axial direction X of the annular bead 30.

La roue 10 comporte une pluralité de nervures de renforcement 40 de renforcement disposées entre le voile 26 et le moyeu 24 dans la cavité 34. Ces nervures radiales 40 sont visibles également sur la figure 4.The wheel 10 comprises a plurality of reinforcing ribs 40 for reinforcement arranged between the web 26 and the hub 24 in the cavity 34. These radial ribs 40 are also visible on the figure 4 .

Comme représenté sur les figures 2 à 4, le voile 26 comporte une pluralité d'orifices traversants 42 disposés entre l'inducteur 20 et l'impulseur 22. Ces orifices traversants 42 permettent le passage de liquide de l'amont de la roue 10 dans la cavité 34. Comme représenté sur la figure 4, chaque orifice traversant 42 débouche entre deux nervures de renforcement 40.As shown on the figures 2 to 4 , the veil 26 comprises a plurality of through holes 42 arranged between the inductor 20 and the impeller 22. These through holes 42 allow the passage of liquid from the upstream of the wheel 10 into the cavity 34. As shown in the figure 4 , each through hole 42 opens between two reinforcing ribs 40.

Par ailleurs, l'inducteur 20 comporte des ailettes 44, dans ce mode de réalisation l'inducteur 20 comporte quatre ailettes 44 et l'impulseur 22 comporte des ailettes 46, dans ce mode de réalisation la roue comporte douze ailettes 46.Furthermore, the inductor 20 comprises fins 44, in this embodiment the inductor 20 comprises four fins 44 and the impeller 22 comprises fins 46, in this embodiment the wheel comprises twelve fins 46.

On notera que les nervures de renforcement 40 sont également au nombre de 12 et qu'elles sont disposées en vis-à-vis de part et d'autre du voile 26.It will be noted that the reinforcing ribs 40 are also 12 in number and that they are arranged facing each other on either side of the web 26.

Par ailleurs, la surface intérieure 36 du moyeu 24 comporte des saillies 48 permettant également le passage du couple entre l'arbre 12 et le moyeu 24.Furthermore, the inner surface 36 of the hub 24 comprises projections 48 also allowing the passage of torque between the shaft 12 and the hub 24.

Dans ce qui suit, les éléments communs aux différents modes de réalisation sont identifiés par les mêmes références numériques.In what follows, the elements common to the different embodiments are identified by the same reference numerals.

Dans le mode de réalisation de la figure 2B, la surface intérieure de frettage 36 est disposée sensiblement complètement, selon la direction axiale X, en amont de l'espace annulaire 32 ménagé entre le moyeu 24 et le bourrelet annulaire 30.In the embodiment of the figure 2B , the inner hooping surface 36 is arranged substantially completely, in the axial direction X, upstream of the annular space 32 provided between the hub 24 and the annular bead 30.

La roue 10 est fabriquée par un procédé de fabrication additive, par exemple par utilisation d'un faisceau laser sur un lit de poudre. Le lit de poudre est formé par la poudre qui constituera la roue 10. Par exemple, la poudre peut comprendre du titane ou être en alliage métallique communément désigné par la marque déposée Inconel™. On parle par la suite d'Inconel pour désigner un alliage à base de fer alliés avec du nickel et du chrome.The wheel 10 is manufactured by an additive manufacturing process, for example by using a laser beam on a powder bed. The powder bed is formed by the powder which will constitute the wheel 10. For example, the powder can comprise titanium or be made of a metal alloy commonly designated by the registered trademark Inconel ™ . We then speak of Inconel to designate an iron-based alloy alloyed with nickel and chromium.

La roue 10 est fabriquée par superposition de couches selon la direction axiale X en partant de son extrémité aval et en terminant par son extrémité amont.The wheel 10 is manufactured by superimposing layers in the axial direction X starting from its downstream end and ending with its upstream end.

Les surfaces extérieures de la roue 10 sont ensuite usinées de manière classique et connue de sorte que l'état de surface du voile 26, des ailettes 44, 46 et de la surface interne 36 du moyeu est conforme au cahier des charges. Il n'est par contre pas nécessaire d'usiner les surfaces de la cavité 34.The outer surfaces of the wheel 10 are then machined in a conventional and known manner so that the surface condition of the veil 26, of the fins 44, 46 and of the inner surface 36 of the hub conforms to the Specifications. On the other hand, it is not necessary to machine the surfaces of the cavity 34.

Quoique le présent exposé ait été décrit en se référant à un exemple de réalisation spécifique, il est évident que des différentes modifications et changements peuvent être effectués sur ces exemples sans sortir de la portée générale de l'invention telle que définie par les revendications. Par conséquent, la description et les dessins doivent être considérés dans un sens illustratif plutôt que restrictif.Although the present description has been described with reference to a specific embodiment, it is obvious that various modifications and changes can be made to these examples without departing from the general scope of the invention as defined by the claims. Accordingly, the description and the drawings should be considered in an illustrative rather than restrictive sense.

Par exemple, le nombre d'ailettes 44 portées par l'inducteur 20 peut varier, il en va de même du nombre d'ailettes 46 portées par l'impulseur 22. Le nombre de nervures de renforcement 40 peut être différent du nombre d'ailettes 46 portées par l'impulseur 22. De même, le nombre d'orifices traversants 42 peut être différent du nombre de nervures de renforcement 40.For example, the number of fins 44 carried by the inductor 20 can vary, the same applies to the number of fins 46 carried by the impeller 22. The number of reinforcing ribs 40 can be different from the number of fins 46 carried by impeller 22. Similarly, the number of through holes 42 may be different from the number of reinforcing ribs 40.

On notera par ailleurs, que les ailettes 44, 46 sont des ailettes droites, ces ailettes peuvent également être inclinées par rapport à la direction radiale, voire présenter une certaine courbure. Il en va de même des nervures de renforcement 40. Les nervures de renforcement 40 représentées sont des nervures radiales. Toutefois, ces nervures peuvent également être inclinées par rapport à la direction radiale, voire présenter une certaine courbure.It will also be noted that the fins 44, 46 are straight fins, these fins can also be inclined with respect to the radial direction, or even have a certain curvature. The same applies to the reinforcing ribs 40. The reinforcing ribs 40 shown are radial ribs. However, these ribs can also be inclined with respect to the radial direction, or even have a certain curvature.

Claims (8)

  1. A rotor (10) for a centrifugal pump having and axial direction (X), the rotor (10) comprising a hub (24), a shroud (26) having an axially symmetrical shape comprising an attachment portion (28) of the shroud (26) with the hub (24), an inducer (20) and an impeller (22), the shroud (26) flaring from the attachment portion (28) in the axial direction (X), characterized in that the rotor includes
    an annular bead (30) arranged between the shroud (26) and the hub (24), the annular bead (30) being attached to the shroud (26) while an annular space (32) is provided between the hub (24) and the annular bead (30) and in that the shroud (26) includes a plurality of through openings (42) arranged between the inducer (20) and the impeller (22).
  2. . The rotor (10) according to claim 1, wherein the wheel (10) comprises an upstream end and a downstream end, the portion (28) for attaching the shroud to the hub (24) being positioned at the upstream end of the rotor (10) and the annular bead (30) being positioned at the downstream end of the rotor (10).
  3. . The rotor (10) according to claim 1 or 2, wherein the hub (24) includes an inner interference fit surface (38) configured to interference fit the hub (24) on a shaft (12), the inner interference fit surface (38) being arranged, at least in part, in the axial direction (X), next to the annular space (32) provided between the hub (24) and the annular bead (30).
  4. . The rotor (10) according to claim 3, wherein the inner interference fit surface (28) is substantially completely arranged in the axial direction (X) next to the annular space (32) provided between the hub (24) and the annular bead (30).
  5. . The rotor (10) according to claim 1 or 2, wherein the hub (24) includes an inner interference fit surface (38) configured to interference fit the hub (24) on a shaft (12), the inner interference fit surface (38) being arranged in the axial direction (X) upstream of the annular space (32) provided between the hub (24) and the annular bead (30).
  6. . The rotor (10) according to any one of claims 1 to 5, wherein the rotor (10) includes a plurality of reinforcing ribs (40) arranged between the shroud (26) and the hub (24).
  7. . A centrifugal pump comprising a wheel (10) according to any one of claims 1 to 6.
  8. . A method of manufacturing a rotor (10) according to any one of claims 1 to 6, the rotor (10) being made by an additive manufacturing method.
EP17793718.2A 2016-10-27 2017-10-16 Impeller for centrifugal pump, centrifugal pump and manufacturing method Active EP3532732B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1660434A FR3058190B1 (en) 2016-10-27 2016-10-27 IMPELLER FOR CENTRIFUGAL PUMP, CENTRIFUGAL PUMP AND MANUFACTURING PROCESS
PCT/FR2017/052832 WO2018078239A1 (en) 2016-10-27 2017-10-16 Impeller for centrifugal pump, centrifugal pump and manufacturing method

Publications (2)

Publication Number Publication Date
EP3532732A1 EP3532732A1 (en) 2019-09-04
EP3532732B1 true EP3532732B1 (en) 2022-03-09

Family

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EP17793718.2A Active EP3532732B1 (en) 2016-10-27 2017-10-16 Impeller for centrifugal pump, centrifugal pump and manufacturing method

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EP (1) EP3532732B1 (en)
FR (1) FR3058190B1 (en)
WO (1) WO2018078239A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024076496A1 (en) * 2022-10-04 2024-04-11 Atlas Copco Comptec, Llc Adapter for torque transmission between two rotatable components

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3589827A (en) * 1969-08-12 1971-06-29 Sergei Stepanovich Gerasimenko Centrifugal leakproof fluid pump
GB1386937A (en) * 1972-04-17 1975-03-12 Mecanique Ind Int Impellers of pumps for cooling systems of internal combustion engines
DE19918286A1 (en) * 1999-04-22 2000-10-26 Ksb Ag Inducer for centrifugal pump is assembled from individual parts, and has blades fitted into and welded to grooves in inducer hub
FR3008749B1 (en) * 2013-07-22 2015-08-28 Snecma CENTRIFUGAL PUMP, ESPECIALLY FOR FEEDER ENGINES
DE102014009735B4 (en) * 2014-07-02 2021-07-15 Rosswag Gmbh Impeller of a turbomachine

Also Published As

Publication number Publication date
FR3058190A1 (en) 2018-05-04
EP3532732A1 (en) 2019-09-04
WO2018078239A1 (en) 2018-05-03
FR3058190B1 (en) 2021-01-29

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