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EP2872783A1 - Ventilation device equipped with a casing shaped as a volute housing - Google Patents

Ventilation device equipped with a casing shaped as a volute housing

Info

Publication number
EP2872783A1
EP2872783A1 EP13729333.8A EP13729333A EP2872783A1 EP 2872783 A1 EP2872783 A1 EP 2872783A1 EP 13729333 A EP13729333 A EP 13729333A EP 2872783 A1 EP2872783 A1 EP 2872783A1
Authority
EP
European Patent Office
Prior art keywords
volute
turbine
angle
expansion
radial
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP13729333.8A
Other languages
German (de)
French (fr)
Other versions
EP2872783B1 (en
Inventor
David Pihet
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.)
Mahle International GmbH
Original Assignee
Delphi Automotive Systems Luxembourg SA
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 Delphi Automotive Systems Luxembourg SA filed Critical Delphi Automotive Systems Luxembourg SA
Publication of EP2872783A1 publication Critical patent/EP2872783A1/en
Application granted granted Critical
Publication of EP2872783B1 publication Critical patent/EP2872783B1/en
Not-in-force 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
    • F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F04D17/08—Centrifugal pumps
    • F04D17/10—Centrifugal pumps for compressing or evacuating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/44—Fluid-guiding means, e.g. diffusers
    • F04D29/441—Fluid-guiding means, e.g. diffusers especially adapted for elastic fluid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F04D17/08—Centrifugal pumps
    • F04D17/16—Centrifugal pumps for displacing without appreciable compression
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
    • F04D29/422—Discharge tongues
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
    • F04D29/4226—Fan casings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
    • F04D29/4226—Fan casings
    • F04D29/4233—Fan casings with volutes extending mainly in axial or radially inward direction
    • 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
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
    • F04D29/663—Sound attenuation
    • 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
    • F05D2250/00—Geometry
    • F05D2250/50—Inlet or outlet
    • F05D2250/52—Outlet

Definitions

  • Ventilation device equipped with a casing shaped volute TECHNICAL DOMAIN
  • the present invention relates to a ventilation device for a heating, ventilation and / or air conditioning system, or HVAC (Heating Ventilating Air Conditionning), in particular for equipping a motor vehicle.
  • HVAC Heating Ventilating Air Conditionning
  • the invention relates more particularly to a ventilation device comprising at least one centrifugal air propulsion member for conveying air through a distribution circuit to the passenger compartment of the vehicle.
  • the centrifugal propulsion member comprises an annular turbine provided with fins which is rotated about an axis of rotation by a motor and which is arranged generally in the center of a casing shaped volute.
  • the air is taken up by the turbine axially from the outside of the housing and is driven along a corridor formed by the housing to a discharge orifice, or radial air outlet mouth communicating with the cooling circuit. distribution.
  • the corridor is delimited by the external surface of revolution of the turbine, defined by the outer edge of the fins, and the inner face of the peripheral wall of the housing enveloping the blades of the turbine at a distance.
  • the radial profile of the peripheral wall of the housing evolves in volute so as to gradually vary the separation distance between the edge of the fins and the inner face of the peripheral wall.
  • the peripheral wall thus forms a spiral around the turbine in the direction, said spiral evolving in the direction of rotation of the turbine.
  • volute To define the shape of the volute, we define an angle of expansion of the volute which corresponds, at a determined point of the volute, to the angle formed between the tangent to the volute and the tangent to a circle passing through this point , the center of the volute and said circle being constituted here by the axis of rotation of the turbine.
  • the invention aims to solve the problem mentioned above by proposing a ventilation device that is particularly effective, especially in terms of size and sound level.
  • the invention proposes a ventilation device for a heating, ventilation and / or air-conditioning installation of a passenger compartment of a motor vehicle, comprising a turbine with blades rotating around an axis of rotation at the inside a casing radially shaped volute, the housing having an axial suction air mouth and a radial air outlet mouth communicating with the interior of a volute compartment delimited by the peripheral wall of the housing , the peripheral wall of the housing progressively moving away from the periphery of the turbine from a volute nose to a distal end of the volute, the radial expansion of the volute being defined by an expansion angle, characterized in that that the initial expansion angle in the vicinity of the volute nose is 1.5 times to 3 times greater than the final expansion angle in the vicinity of the distal end of the volute, so that the The device's periphery moves away more rapidly from the fins at the beginning of the volute, minimizing the turbulence generated at the volute spout.
  • the ventilation device according to the invention also has the advantage of obtaining these good results while having a structure easy to manufacture and assemble, so that the cost of manufacture / efficiency is particularly interesting.
  • R v i is the radius of the volute at a certain point in the volute
  • R t is the outside radius of the turbine
  • dtv is the minimum radial distance between the outer edge of the turbine blades and the volute nose
  • 9i is the angle defined by the initial end of the volute and the determined point of the volute around the axis of rotation
  • ai is the initial expansion angle of the volute
  • a 2 is the final expansion angle of the volute
  • Omax is the volute angle that corresponds to the angle defined by the initial end of the volute and the distal end of the volute around the axis of rotation.
  • the volute angle is between 290 and 315 degrees
  • the initial expansion angle is between 3.5 and 9 degrees
  • the final expansion angle is between 3 and 5 degrees
  • the axial section of the peripheral wall of the volute has a generally C-shaped profile, preferably an oval profile;
  • the radial outlet mouth has an axial section with a rounded or oval profile so that the outlet section extends from the end distal from the volute to the radial outlet mouth, gradually forms a tube;
  • the volute beak has a generally oval profile
  • the external profile of the turbine, in an axial plane, is generally parallel to the axis of the turbine;
  • the inner circumferential edge of the volute is extended, on the side of the suction axial mouth, by a radial extension which covers a portion of the turbine and which defines the axial suction mouth;
  • the housing is made in the form of two half-shells, preferably made by molding in plastic material, the two half-shells being assembled with each other along a joint plane orthogonal to the axis of the turbine .
  • FIG. 1 is a perspective view which shows schematically a ventilation device comprising a cased housing in accordance with the teachings of the invention
  • FIG. 2 is a view similar to that of Figure 1 in which a portion of the housing has been torn to highlight the inside of the housing and the turbine;
  • FIG. 3 is a partial axial sectional view which shows the volute nozzle of the housing of Figure 1;
  • FIG. 4 is an axial sectional view along the plane 4-4 which shows the ventilation device of the figure and which illustrates the profile of the peripheral wall of the housing;
  • FIG. 5 is a top view which shows the ventilation device of Figure 1 and which illustrates the expansion angles of the volute. DESCRIPTION OF THE PREFERRED EMBODIMENTS
  • FIG. 1 to 5 There is shown in Figures 1 to 5 a ventilation device 10 made in accordance with the teachings of the invention and intended to equip a heating, ventilation and / or air conditioning of a passenger compartment of a motor vehicle.
  • the ventilation device 10 comprises a turbine 12 fin 13 rotatably mounted about an axis of rotation Al inside a casing 14 radially shaped volute.
  • the housing 14 has an axial air inlet mouth 16 and a radial air outlet mouth 18 which communicate with the interior of a compartment 20, or corridor, volute delimited by the peripheral wall 22 of the housing 14
  • the peripheral wall 22 of the housing 14 moves away radially and progressively from the periphery of the turbine 12 from a spout 24 of volute to a distal end E 2 of the volute, as shown in FIG.
  • the spout 24 of volute which is shown in more detail in FIG. 3, consists of a portion of the peripheral wall 22 which is located generally at the intersection between the volute and a tubular outlet section 28 which extends from the distal end E 2 of the volute to the radial mouth 18.
  • the distal end E 2 of the volute corresponds generally to the end of the radial expansion of the housing 14, the outlet section 28 extending in a generally correct way line in the direction of the air discharge Fl, in a direction generally tangent to the turbine 12.
  • the volute has, at its spout 24, an initial expansion angle ai and at its distal end E 2 a final expansion angle a 2 .
  • the value of the initial expansion angle ⁇ 1 is preferably between 1.5 and 3 times the value of the final expansion angle a 2 .
  • the higher value of the initial expansion angle ai allows the volute to move radially away from the turbine 12 more rapidly at the beginning of its radial expansion than at the end of its radial expansion so as to minimize the turbulence produced. in the air flow at volute spout 24 which are the source of significant noise pollution given the close proximity of volute spout 24 with turbine 12.
  • the expansion angle 3 ⁇ 4 increases gradually until it reaches its average value around the first third of the volute.
  • the radial expansion of the volute is defined by the equation:
  • R v i is the radius of the volute at a given point Ei of the volute
  • R t is the outside radius of the turbine 12
  • dtv is the minimum radial distance between the outer edge of the fins 13 of the turbine 12 and the spout 24 of volute
  • 9i is the angle defined by the initial end Ei of the volute and the determined point Ei of the volute around the axis of rotation Al,
  • ai is the initial expansion angle of the volute
  • a 2 is the final expansion angle of the volute
  • Omax is the volute angle that corresponds to the angle defined by the initial end Ei of the volute and the distal end E 2 of the volute around the axis of rotation Al.
  • the volute angle 9 max thus defines the value of the angular sector along which the volute develops.
  • the initial expansion angle ai of the volute is preferably between 3.5 and 9 degrees and the final expansion angle a 2 is preferably between 3 and 5 degrees.
  • the volute angle ⁇ max is preferably between 290 and 315 degrees.
  • Equation (1) defines the evolution of the radius R v i of the volute from the initial end Ei to the distal end E 2 . This equation has been developed to allow both an initial expansion angle ⁇ greater than the final expansion angle a 2 and a controlled progressiveness of radial expansion. The tests and measurements carried out by the applicant showed excellent results in terms of reduced sound level and in terms of efficiency of the pulsed air flow. Equation (1) provides a spiral profile for the volute which is particularly well suited for applications of the HVAC type for motor vehicles.
  • the evolution of the axial expansion of the volute follows generally the evolution of the radial expansion of the volute.
  • the evolution of the axial expansion can be dissociated from the evolution of the radial expansion, for example by increasing continuously and regularly all along the volute from its spout 24 to its distal end E2.
  • the profile of the peripheral wall 22 of the casing 14 in an axial plane is curved to form a substantially oval or ellipsoidal portion intended to eliminate the angles inside the compartment 20.
  • the axial section of the peripheral wall 22 possesses preferably a generally "C" shaped profile, as illustrated by the axial sectional view of FIG. 4.
  • the volute thus has an upper inner circumferential edge 30 which is curved inwards and downwards and a circumferential edge lower internal 32 which is bent inwards and upwards.
  • the upper circumferential edge 30 extends partially above the turbine 12, at the fins 13.
  • the lower circumferential edge 32 is extended radially inwardly to form the bottom wall 36 of the housing 22, opposite the axial mouth 16.
  • the radial outlet mouth 18 has an axial section of rounded or oval-shaped profile, as illustrated in FIGS. 1, 2 and 3, so that the outlet section gradually forms a tube.
  • the spout 24 of volute has an oval profile, generally ellipsoidal or parabolic, which is illustrated in Figure 3, so as to minimize the turbulence produced in the air pulsed at the spout 24 of volute.
  • the housing 22 according to the invention is particularly suitable for a turbine 12 whose outer profile, in an axial plane, is generally parallel to the axis A1, the outer edge of the fins 13 being generally vertical.
  • the casing 14 is made in the form of two half-shells 38, 40 which are assembled with one another along a joint plane 42 orthogonal to the axis Al of the turbine 12, the joint plane 42 being illustrated in Figures 1 and 2.
  • the two half-shells 38, 40 can thus be made by molding plastic material.

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

Abstract

Ventilation device (10) comprising a turbine (12) mounted inside a casing (14) shaped radially as a volute housing, the peripheral wall (22) of the casing (14) diverging gradually away from the periphery of the turbine (12) from a volute tongue (24) to a distal end (E2) of the volute, the radial expansion of the volute being defined by an angle of expansion (a), characterized in that the initial angle of expansion (a) near the volute tongue (24) is 1.5 times to 3 times higher than the final angle of expansion (a2) near the distal end (E2)of the volute, such that the peripheral wall (22) of the casing (14) diverges more rapidly from the vanes at the start of the volute thereby minimizing the turbulence generated at the volute tongue (24).

Description

Dispositif de ventilation équipé d'un boîtier conformé en volute DOMAINE TECHNIQUE  Ventilation device equipped with a casing shaped volute TECHNICAL DOMAIN
La présente invention concerne un dispositif de ventilation pour une installation de chauffage, de ventilation et/ou de climatisation, ou HVAC (Heating Ventilating Air Conditionning), notamment destinée à équiper un véhicule automobile.  The present invention relates to a ventilation device for a heating, ventilation and / or air conditioning system, or HVAC (Heating Ventilating Air Conditionning), in particular for equipping a motor vehicle.
ARRIERE-PLAN TECHNOLOGIQUE DE L'INVENTION BACKGROUND OF THE INVENTION
L'invention concerne plus particulièrement un dispositif de ventilation comprenant au moins un organe de propulsion centrifuge d'air destiné à acheminer l'air à travers un circuit de distribution vers l'habitacle du véhicule. L'organe de propulsion centrifuge comporte une turbine annulaire pourvue d'ailettes qui est entraînée en rotation autour d'un axe de rotation par un moteur et qui est agencée globalement au centre d'un boîtier conformé en volute. L'air est prélevé par la turbine axialement depuis l'extérieur du boîtier et est entraîné le long d'un couloir formé par le boîtier jusqu'à un orifice d'évacuation, ou bouche radiale de refoulement d'air communicant avec le circuit de distribution.  The invention relates more particularly to a ventilation device comprising at least one centrifugal air propulsion member for conveying air through a distribution circuit to the passenger compartment of the vehicle. The centrifugal propulsion member comprises an annular turbine provided with fins which is rotated about an axis of rotation by a motor and which is arranged generally in the center of a casing shaped volute. The air is taken up by the turbine axially from the outside of the housing and is driven along a corridor formed by the housing to a discharge orifice, or radial air outlet mouth communicating with the cooling circuit. distribution.
Le couloir est délimité par la surface de révolution extérieure de la turbine, définie par la tranche extérieure des ailettes, et la face interne de la paroi périphérique du boîtier enveloppant à distance les ailettes de la turbine. Le profil radial de la paroi périphérique du boîtier évolue en volute de manière à faire varier progressivement la distance de séparation entre la tranche des ailettes et la face interne de la paroi périphérique. La paroi périphérique forme donc une spirale autour de la turbine dans la direction, ladite spirale évoluant dans le sens de rotation de la turbine.  The corridor is delimited by the external surface of revolution of the turbine, defined by the outer edge of the fins, and the inner face of the peripheral wall of the housing enveloping the blades of the turbine at a distance. The radial profile of the peripheral wall of the housing evolves in volute so as to gradually vary the separation distance between the edge of the fins and the inner face of the peripheral wall. The peripheral wall thus forms a spiral around the turbine in the direction, said spiral evolving in the direction of rotation of the turbine.
Pour définir la forme de la volute, on définit un angle d'expansion de la volute qui correspond, en un point déterminé de la volute, à l'angle formé entre la tangente à la volute et la tangente à un cercle passant par ce point, le centre de la volute et dudit cercle étant constitué ici par l'axe de rotation de la turbine.  To define the shape of the volute, we define an angle of expansion of the volute which corresponds, at a determined point of the volute, to the angle formed between the tangent to the volute and the tangent to a circle passing through this point , the center of the volute and said circle being constituted here by the axis of rotation of the turbine.
Généralement, lorsque l'on parcourt la volute dans le sens de rotation de la turbine, on constate que l'angle d'expansion est sensiblement constant, ce qui conduit à une augmentation régulière de la distance entre la tranche externe des ailettes de la turbine et la face interne de la paroi périphérique. Generally, when the volute is traversed in the direction of rotation of the turbine, it is found that the expansion angle is substantially constant, which leads to a regular increase in the distance between the outer edge of the blades. blades of the turbine and the inner face of the peripheral wall.
Pour la conception d'un tel dispositif de ventilation, il est nécessaire de composer avec différents paramètres tels que l'efficacité du dispositif, le rendement et le débit d'air offert par la turbine, l'encombrement global et les dimensions relatives entre la turbine et le boîtier, ainsi que les nuisances sonores générées. On souhaite généralement avoir un encombrement du dispositif le plus faible possible pour optimiser l'espace disponible, et on souhaite éviter au mieux la création de zones de turbulences génératrices de nuisances sonores.  For the design of such a ventilation device, it is necessary to deal with various parameters such as the efficiency of the device, the efficiency and the air flow offered by the turbine, the overall size and the relative dimensions between the turbine and the housing, as well as the noise generated. It is generally desired to have the smallest possible size of the device to optimize the available space, and it is best to avoid the creation of turbulence zones generating noise pollution.
Diverses solutions et différents compromis ont été proposés dans les dispositifs de l'art antérieur, mais ils ne permettent pas d'obtenir un résultat entièrement satisfaisant en termes d'encombrement et de niveau sonore.  Various solutions and different compromises have been proposed in the devices of the prior art, but they do not allow to obtain a completely satisfactory result in terms of size and sound level.
RESUME DE L'INVENTION SUMMARY OF THE INVENTION
L'invention vise à résoudre le problème mentionné précédemment en proposant un dispositif de ventilation qui soit particulièrement efficace, notamment en termes d'encombrement et de niveau sonore.  The invention aims to solve the problem mentioned above by proposing a ventilation device that is particularly effective, especially in terms of size and sound level.
Dans ce but, l'invention propose un dispositif de ventilation pour une installation de chauffage, de ventilation et/ou de climatisation d'un habitacle de véhicule automobile, comportant une turbine à ailettes montée tournante autour d'un axe de rotation à l'intérieur d'un boîtier radialement conformé en volute, le boîtier comportant une bouche axiale d'aspiration d'air et une bouche radiale de refoulement d'air qui communiquent avec l'intérieur d'un compartiment en volute délimité par la paroi périphérique du boîtier, la paroi périphérique du boîtier s'éloignant progressivement de la périphérie de la turbine depuis un bec de volute jusqu'à une extrémité distale de la volute, l'expansion radiale de la volute étant définie par un angle d'expansion, caractérisé en ce que l'angle d'expansion initial au voisinage du bec de volute est 1 ,5 fois à 3 fois supérieur à l'angle d'expansion final au voisinage de l'extrémité distale de la volute, de sorte que la paroi périphérique du boîtier s'éloigne plus rapidement des ailettes au début de la volute en minimisant les turbulences générées au niveau du bec de volute.  For this purpose, the invention proposes a ventilation device for a heating, ventilation and / or air-conditioning installation of a passenger compartment of a motor vehicle, comprising a turbine with blades rotating around an axis of rotation at the inside a casing radially shaped volute, the housing having an axial suction air mouth and a radial air outlet mouth communicating with the interior of a volute compartment delimited by the peripheral wall of the housing , the peripheral wall of the housing progressively moving away from the periphery of the turbine from a volute nose to a distal end of the volute, the radial expansion of the volute being defined by an expansion angle, characterized in that that the initial expansion angle in the vicinity of the volute nose is 1.5 times to 3 times greater than the final expansion angle in the vicinity of the distal end of the volute, so that the The device's periphery moves away more rapidly from the fins at the beginning of the volute, minimizing the turbulence generated at the volute spout.
Les essais effectués par le demandeur ont permis de démontrer que la combinaison de caractéristiques du dispositif de ventilation selon l'invention permet d'obtenir des résultats particulièrement bons, en particulier en matière de niveau sonore puisqu'il a été possible de gagner plusieurs décibels (au moins 3dB(A)) en diminuant les turbulences non désirées tout en maintenant un débit du flux d'air puisé et une vélocité du flux d'air puisé de niveaux élevés. De plus, ces bons résultats ont été obtenus à encombrement extérieur du boîtier constant, c'est- à-dire sans avoir à augmenter les dimensions extérieures du boîtier. The tests carried out by the applicant have made it possible to demonstrate that the combination of characteristics of the ventilation device according to the invention makes it possible to obtain particularly good results, in particular with regard to sound level since it was possible to gain several decibels (at least 3dB (A)) by reducing unwanted turbulence while maintaining a flow rate of the pulsed air flow and a velocity of the air flow pulsed high levels. In addition, these good results have been obtained with external dimensions of the housing constant, that is to say without having to increase the external dimensions of the housing.
Le dispositif de ventilation selon l'invention présente également l'avantage d'obtenir ces bons résultats tout en ayant une structure facile à fabriquer et à assembler, de sorte que le rapport coût de fabrication/efficacité est particulièrement intéressant.  The ventilation device according to the invention also has the advantage of obtaining these good results while having a structure easy to manufacture and assemble, so that the cost of manufacture / efficiency is particularly interesting.
Avantageusement, des résultats particulièrement bons sont obtenus lorsque l'expansion radiale de la volute est définie par l'équation :  Advantageously, particularly good results are obtained when the radial expansion of the volute is defined by the equation:
Rvi = (Rt + dtv) x e 1 v 1 v emax J lJJ Rvi = (R t + d tv ) xe 1 v 1 ve max J l JJ
où :  or :
Rvi est le rayon de la volute en un point déterminé de la volute, R v i is the radius of the volute at a certain point in the volute,
Rt est le rayon extérieur de la turbine, R t is the outside radius of the turbine,
dtv est la distance radiale minimale entre le bord extérieur des ailettes de la turbine et le bec de volute,  dtv is the minimum radial distance between the outer edge of the turbine blades and the volute nose,
9i est l'angle défini par l'extrémité initiale de la volute et le point déterminé de la volute autour de l'axe de rotation,  9i is the angle defined by the initial end of the volute and the determined point of the volute around the axis of rotation,
ai est l'angle d'expansion initial de la volute,  ai is the initial expansion angle of the volute,
a2 est l'angle d'expansion final de la volute, a 2 is the final expansion angle of the volute,
Omax est l'angle de volute qui correspond à l'angle défini par l'extrémité initiale de la volute et l'extrémité distale de la volute autour de l'axe de rotation.  Omax is the volute angle that corresponds to the angle defined by the initial end of the volute and the distal end of the volute around the axis of rotation.
Selon d'autres caractéristiques avantageuses de l'invention :  According to other advantageous features of the invention:
- l'angle de volute est compris entre 290 et 315 degrés ;  the volute angle is between 290 and 315 degrees;
- l'angle d'expansion initial est compris entre 3,5 et 9 degrés ;  the initial expansion angle is between 3.5 and 9 degrees;
- l'angle d'expansion final est compris entre 3 et 5 degrés ;  the final expansion angle is between 3 and 5 degrees;
- la section axiale de la paroi périphérique de la volute a un profil globalement en forme de « C », de préférence un profil ovalisé ;  - The axial section of the peripheral wall of the volute has a generally C-shaped profile, preferably an oval profile;
- la bouche radiale de refoulement possède une section axiale de profil arrondi ou ovalisé de sorte que le tronçon de sortie, qui s'étend depuis l'extrémité distale de la volute jusqu'à la bouche radiale de refoulement, forme progressivement un tube ; the radial outlet mouth has an axial section with a rounded or oval profile so that the outlet section extends from the end distal from the volute to the radial outlet mouth, gradually forms a tube;
- l'évolution de l'expansion axiale de la volute suit globalement l'évolution de son expansion radiale ;  the evolution of the axial expansion of the volute follows globally the evolution of its radial expansion;
- le bec de volute a globalement un profil ovalisé ;  - The volute beak has a generally oval profile;
- le profil extérieur de la turbine, dans un plan axial, est globalement parallèle à l'axe de la turbine ;  the external profile of the turbine, in an axial plane, is generally parallel to the axis of the turbine;
- le bord circonférentiel interne de la volute se prolonge, du côté de la bouche axiale d'aspiration, par une extension radiale qui recouvre une portion de la turbine et qui délimite la bouche axiale d'aspiration ;  - The inner circumferential edge of the volute is extended, on the side of the suction axial mouth, by a radial extension which covers a portion of the turbine and which defines the axial suction mouth;
- le boîtier est réalisé sous la forme de deux demi-coquilles, de préférence réalisées par moulage en matériau plastique, les deux demi-coquilles étant assemblées l'une avec l'autre selon un plan de joint orthogonal à l'axe de la turbine.  the housing is made in the form of two half-shells, preferably made by molding in plastic material, the two half-shells being assembled with each other along a joint plane orthogonal to the axis of the turbine .
BREVE DESCRIPTION DES DESSINS BRIEF DESCRIPTION OF THE DRAWINGS
D'autres caractéristiques, buts et avantages de l'invention apparaîtront à la lecture de la description détaillée qui va suivre, et en regard des dessins annexés, donnés à titre d'exemple non limitatif et sur lesquels:  Other features, objects and advantages of the invention will appear on reading the detailed description which follows, and with reference to the accompanying drawings, given by way of non-limiting example and in which:
- la figure 1 est une vue en perspective qui représente schématiquement un dispositif de ventilation comportant un boîtier en volute conforme aux enseignements de l'invention ;  - Figure 1 is a perspective view which shows schematically a ventilation device comprising a cased housing in accordance with the teachings of the invention;
- la figure 2 est une vue similaire à celle de la figure 1 dans laquelle une portion du boîtier a été arrachée pour mettre en évidence l'intérieur du boîtier et la turbine ;  - Figure 2 is a view similar to that of Figure 1 in which a portion of the housing has been torn to highlight the inside of the housing and the turbine;
- la figure 3 est une vue en coupe axiale partielle qui représente le bec de volute du boîtier de la figure 1 ;  - Figure 3 is a partial axial sectional view which shows the volute nozzle of the housing of Figure 1;
- la figure 4 est une vue en coupe axiale selon le plan 4-4 qui représente le dispositif de ventilation de la figure et qui illustre le profil de la paroi périphérique du boîtier ;  - Figure 4 is an axial sectional view along the plane 4-4 which shows the ventilation device of the figure and which illustrates the profile of the peripheral wall of the housing;
- la figure 5 est une vue de dessus qui représente le dispositif de ventilation de la figure 1 et qui illustre les angles d'expansion de la volute. DESCRIPTION DES MODES DE REALISATION PREFERES - Figure 5 is a top view which shows the ventilation device of Figure 1 and which illustrates the expansion angles of the volute. DESCRIPTION OF THE PREFERRED EMBODIMENTS
On a représenté sur les figures 1 à 5 un dispositif de ventilation 10 réalisé conformément aux enseignements de l'invention et destiné à équiper une installation de chauffage, de ventilation et/ou de climatisation d'un habitacle de véhicule automobile.  There is shown in Figures 1 to 5 a ventilation device 10 made in accordance with the teachings of the invention and intended to equip a heating, ventilation and / or air conditioning of a passenger compartment of a motor vehicle.
Le dispositif de ventilation 10 comporte une turbine 12 à ailettes 13 montée tournante autour d'un axe de rotation Al à l'intérieur d'un boîtier 14 radialement conformé en volute.  The ventilation device 10 comprises a turbine 12 fin 13 rotatably mounted about an axis of rotation Al inside a casing 14 radially shaped volute.
Dans la suite de la description, on utilisera à titre non limitatif une orientation axiale verticale suivant l'axe de rotation Al et une orientation radiale par rapport à l'axe de rotation Al .  In the remainder of the description, non-limiting use will be made of a vertical axial orientation along the axis of rotation A1 and a radial orientation with respect to the axis of rotation A1.
Le boîtier 14 comporte une bouche axiale 16 d'aspiration d'air et une bouche radiale 18 de refoulement d'air qui communiquent avec l'intérieur d'un compartiment 20, ou couloir, en volute délimité par la paroi périphérique 22 du boîtier 14. Dans un plan radial, la paroi périphérique 22 du boîtier 14 s'éloigne radialement et progressivement de la périphérie de la turbine 12 depuis un bec 24 de volute jusqu'à une extrémité distale E2 de la volute, comme illustré par la figure 5. Le bec 24 de volute, qui est représenté plus en détail sur la figure 3, est constitué par une portion de la paroi périphérique 22 qui se situe globalement à l'intersection entre la volute et un tronçon de sortie 28 tubulaire, qui s'étend depuis l'extrémité distale E2 de la volute jusqu'à la bouche radiale 18. L'extrémité distale E2 de la volute correspond globalement à la fin de l'expansion radiale du boîtier 14, le tronçon de sortie 28 s'étendant de manière globalement rectiligne dans la direction du refoulement d'air Fl, selon une direction globalement tangente par rapport à la turbine 12. The housing 14 has an axial air inlet mouth 16 and a radial air outlet mouth 18 which communicate with the interior of a compartment 20, or corridor, volute delimited by the peripheral wall 22 of the housing 14 In a radial plane, the peripheral wall 22 of the housing 14 moves away radially and progressively from the periphery of the turbine 12 from a spout 24 of volute to a distal end E 2 of the volute, as shown in FIG. The spout 24 of volute, which is shown in more detail in FIG. 3, consists of a portion of the peripheral wall 22 which is located generally at the intersection between the volute and a tubular outlet section 28 which extends from the distal end E 2 of the volute to the radial mouth 18. The distal end E 2 of the volute corresponds generally to the end of the radial expansion of the housing 14, the outlet section 28 extending in a generally correct way line in the direction of the air discharge Fl, in a direction generally tangent to the turbine 12.
Sur la figure 5, on a illustré l'angle d'expansion initial ai de la volute à son origine c'est-à-dire à l'extrémité initiale Ei située au niveau du bec 24 de volute.  In FIG. 5, the initial expansion angle ai of the volute at its origin, that is to say at the initial end Ei situated at the level of the volute spout 24, is illustrated.
La volute comporte, au niveau de son bec 24, un angle d'expansion initial ai et au niveau de son extrémité distale E2 un angle d'expansion final a2. La valeur de l'angle d'expansion initial ai est de préférence comprise entre 1,5 et 3 fois la valeur de l'angle d'expansion final a2. La valeur plus élevée de l'angle d'expansion initial ai permet à la volute de s'écarter radialement de la turbine 12 plus rapidement au début de son expansion radiale qu'à la fin de son expansion radiale de manière à minimiser les turbulences produites dans le flux d'air au niveau du bec de volute 24 qui sont la sources de fortes nuisances sonores compte tenu de la grande proximité du bec de volute 24 avec la turbine 12. The volute has, at its spout 24, an initial expansion angle ai and at its distal end E 2 a final expansion angle a 2 . The value of the initial expansion angle α 1 is preferably between 1.5 and 3 times the value of the final expansion angle a 2 . The higher value of the initial expansion angle ai allows the volute to move radially away from the turbine 12 more rapidly at the beginning of its radial expansion than at the end of its radial expansion so as to minimize the turbulence produced. in the air flow at volute spout 24 which are the source of significant noise pollution given the close proximity of volute spout 24 with turbine 12.
De préférence, l'angle d'expansion ¾ augmente progressivement jusqu'à atteindre sa valeur moyenne aux environs du premier tiers de la volute.  Preferably, the expansion angle ¾ increases gradually until it reaches its average value around the first third of the volute.
Avantageusement, l'expansion radiale de la volute est définie par l'équation :  Advantageously, the radial expansion of the volute is defined by the equation:
Rvi = (Rt + dtv) e emax j lJJ (i) R vi = (R t + dtv) ee max j l J (i)
où :  or :
Rvi est le rayon de la volute en un point déterminé Ei de la volute,R v i is the radius of the volute at a given point Ei of the volute,
Rt est le rayon extérieur de la turbine 12, R t is the outside radius of the turbine 12,
dtv est la distance radiale minimale entre le bord extérieur des ailettes 13 de la turbine 12 et le bec 24 de volute,  dtv is the minimum radial distance between the outer edge of the fins 13 of the turbine 12 and the spout 24 of volute,
9i est l'angle défini par l'extrémité initiale Ei de la volute et le point déterminé Ei de la volute autour de l'axe de rotation Al,  9i is the angle defined by the initial end Ei of the volute and the determined point Ei of the volute around the axis of rotation Al,
ai est l'angle d'expansion initial de la volute,  ai is the initial expansion angle of the volute,
a2 est l'angle d'expansion final de la volute, a 2 is the final expansion angle of the volute,
Omax est l'angle de volute qui correspond à l'angle défini par l'extrémité initiale Ei de la volute et l'extrémité distale E2 de la volute autour de l'axe de rotation Al . L'angle de volute 9max définit ainsi la valeur du secteur angulaire le long duquel se développe la volute. Omax is the volute angle that corresponds to the angle defined by the initial end Ei of the volute and the distal end E 2 of the volute around the axis of rotation Al. The volute angle 9 max thus defines the value of the angular sector along which the volute develops.
L'angle d'expansion initial ai de la volute est de préférence compris entre 3,5 et 9 degrés et l'angle d'expansion final a2 est de préférence compris entre 3 et 5 degrés. The initial expansion angle ai of the volute is preferably between 3.5 and 9 degrees and the final expansion angle a 2 is preferably between 3 and 5 degrees.
L'angle de volute 9max est compris de préférence entre 290 et 315 degrés.The volute angle θ max is preferably between 290 and 315 degrees.
L'équation (1) permet de définir l'évolution du rayon Rvi de la volute depuis l'extrémité initiale Ei jusqu'à l'extrémité distale E2. Cette équation a été mise au point de manière à permettre à la fois un angle d'expansion initial ai plus élevé que l'angle d'expansion final a2 et une progressivité contrôlée de l'expansion radiale. Les tests et mesures effectués par le demandeur ont montré d'excellents résultats en termes de niveau sonore réduit et en termes d'efficacité du flux d'air puisé. L'équation (1) permet d'obtenir un profil de spirale pour la volute qui est particulièrement bien adapté aux applications du type HVAC pour les véhicules automobiles. Equation (1) defines the evolution of the radius R v i of the volute from the initial end Ei to the distal end E 2 . This equation has been developed to allow both an initial expansion angle α greater than the final expansion angle a 2 and a controlled progressiveness of radial expansion. The tests and measurements carried out by the applicant showed excellent results in terms of reduced sound level and in terms of efficiency of the pulsed air flow. Equation (1) provides a spiral profile for the volute which is particularly well suited for applications of the HVAC type for motor vehicles.
De préférence, l'évolution de l'expansion axiale de la volute, c'est-à-dire l'évolution de la dimension axiale maximale de la paroi périphérique 22, suit globalement l'évolution de l'expansion radiale de la volute. Selon une variante de réalisation, l'évolution de l'expansion axiale peut être dissociée de l'évolution de l'expansion radiale, par exemple en augmentant de manière continue et régulière tout le long de la volute depuis son bec 24 jusqu'à son extrémité distale E2.  Preferably, the evolution of the axial expansion of the volute, that is to say the evolution of the maximum axial dimension of the peripheral wall 22, follows generally the evolution of the radial expansion of the volute. According to an alternative embodiment, the evolution of the axial expansion can be dissociated from the evolution of the radial expansion, for example by increasing continuously and regularly all along the volute from its spout 24 to its distal end E2.
De manière avantageuse, le profil de la paroi périphérique 22 du boîtier 14 dans un plan axial est courbé pour former une portion sensiblement ovale ou ellipsoïdale visant à supprimer les angles à l'intérieur du compartiment 20. La section axiale de la paroi périphérique 22 possède de préférence un profil globalement en forme de « C », comme illustré par la vue en coupe axiale de la figure 4. La volute comporte ainsi un bord circonférentiel interne supérieur 30 qui est recourbé vers l'intérieur et vers le bas et un bord circonférentiel interne inférieur 32 qui est recourbé vers l'intérieur et vers le haut.  Advantageously, the profile of the peripheral wall 22 of the casing 14 in an axial plane is curved to form a substantially oval or ellipsoidal portion intended to eliminate the angles inside the compartment 20. The axial section of the peripheral wall 22 possesses preferably a generally "C" shaped profile, as illustrated by the axial sectional view of FIG. 4. The volute thus has an upper inner circumferential edge 30 which is curved inwards and downwards and a circumferential edge lower internal 32 which is bent inwards and upwards.
Selon le mode de réalisation représenté, le bord circonférentiel supérieur According to the embodiment shown, the upper circumferential edge
30 se prolonge radialement vers l'intérieur pour former le bord périphérique 34 délimitant la bouche axiale 16. Le bord circonférentiel supérieur 30 s'étend partiellement au-dessus de la turbine 12, au niveau des ailettes 13. Le bord circonférentiel inférieur 32 se prolonge radialement vers l'intérieur pour former la paroi de fond 36 du boîtier 22, en vis-à-vis de la bouche axiale 16. Extends radially inward to form the peripheral edge 34 delimiting the axial mouth 16. The upper circumferential edge 30 extends partially above the turbine 12, at the fins 13. The lower circumferential edge 32 is extended radially inwardly to form the bottom wall 36 of the housing 22, opposite the axial mouth 16.
Avantageusement, la bouche radiale 18 de refoulement possède une section axiale de profil arrondi ou ovalisé, comme illustré sur les figures 1 , 2 et 3, de sorte que le tronçon de sortie forme progressivement un tube.  Advantageously, the radial outlet mouth 18 has an axial section of rounded or oval-shaped profile, as illustrated in FIGS. 1, 2 and 3, so that the outlet section gradually forms a tube.
De préférence, le bec 24 de volute a un profil ovalisé, globalement ellipsoïdal ou parabolique, qui est illustré par la figure 3, de manière à minimiser les turbulences produites dans l'air puisé au niveau du bec 24 de volute. Le boîtier 22 selon l'invention est particulièrement adapté à une turbine 12 dont le profil extérieur, dans un plan axial, est globalement parallèle à l'axe Al , la tranche extérieure des ailettes 13 étant globalement verticale. Preferably, the spout 24 of volute has an oval profile, generally ellipsoidal or parabolic, which is illustrated in Figure 3, so as to minimize the turbulence produced in the air pulsed at the spout 24 of volute. The housing 22 according to the invention is particularly suitable for a turbine 12 whose outer profile, in an axial plane, is generally parallel to the axis A1, the outer edge of the fins 13 being generally vertical.
Avantageusement, le boîtier 14 est réalisé sous la forme de deux demi- coquilles 38, 40 qui sont assemblées l'une avec l'autre selon un plan de joint 42 orthogonal à l'axe Al de la turbine 12, le plan de joint 42 étant illustré sur les figures 1 et 2. Les deux demi-coquilles 38, 40 peuvent ainsi être réalisées par moulage en matériau plastique.  Advantageously, the casing 14 is made in the form of two half-shells 38, 40 which are assembled with one another along a joint plane 42 orthogonal to the axis Al of the turbine 12, the joint plane 42 being illustrated in Figures 1 and 2. The two half-shells 38, 40 can thus be made by molding plastic material.

Claims

REVENDICATIONS
1. Dispositif de ventilation (10) pour une installation de chauffage, de ventilation et/ou de climatisation d'un habitacle de véhicule automobile, comportant une turbine (12) à ailettes (13) montée tournante autour d'un axe de rotation (Al) à l'intérieur d'un boîtier (14) radialement conformé en volute, le boîtier (14) comportant une bouche axiale (16) d'aspiration d'air et une bouche radiale (18) de refoulement d'air qui communiquent avec l'intérieur d'un compartiment (20) en volute délimité par la paroi périphérique (22) du boîtier (14), la paroi périphérique (22) du boîtier (14) s'éloignant progressivement de la périphérie de la turbine (12) depuis un bec (24) de volute jusqu'à une extrémité distale (E2) de la volute, l'expansion radiale de la volute étant définie par un angle d'expansion (ai), caractérisé en ce que l'angle d'expansion initial (ai) au voisinage du bec (24) de volute est 1,5 fois à 3 fois supérieur à l'angle d'expansion final (a2) au voisinage de l'extrémité distale (E2) de la volute, de sorte que la paroi périphérique (22) du boîtier (14) s'éloigne plus rapidement des ailettes (13) au début de la volute en minimisant les turbulences générées au niveau du bec (24) de volute, et en ce que Ventilation device (10) for a heating, ventilating and / or air-conditioning installation of a passenger compartment of a motor vehicle, comprising a turbine (12) with fins (13) rotatably mounted about an axis of rotation ( A1) within a casing (14) radially volute shaped, the casing (14) having an axial air suction mouth (16) and a radial air discharge mouth (18) which communicate with each other. with the interior of a compartment (20) in volute delimited by the peripheral wall (22) of the housing (14), the peripheral wall (22) of the housing (14) progressively moving away from the periphery of the turbine (12). ) from a spout (24) of volute to a distal end (E 2 ) of the volute, the radial expansion of the volute being defined by an expansion angle (ai), characterized in that the angle d initial expansion (ai) in the vicinity of the volute nose (24) is 1.5 times to 3 times greater than the final expansion angle (a 2 ) at near the distal end (E 2 ) of the volute, so that the peripheral wall (22) of the housing (14) moves away more quickly from the fins (13) at the beginning of the volute while minimizing the turbulence generated at the of the spout (24) of volute, and in that
l'expansion radiale de la volute est définie par l'équation :  the radial expansion of the volute is defined by the equation:
Rvi = (Rt + dtv) e emax j lJJ (i) R vi = (R t + dtv) ee max j l J (i)
où :  or :
Rvi est le rayon de la volute en un point déterminé (E;) de la volute, Rt est le rayon extérieur de la turbine (12), R v i is the radius of the volute at a given point (E;) of the volute, R t is the outside radius of the turbine (12),
dtv est la distance radiale minimale entre le bord extérieur des ailettes (13) de la turbine (12) et le bec (24) de volute,  dtv is the minimum radial distance between the outer edge of the blades (13) of the turbine (12) and the spout (24) of volute,
9i est l'angle défini par l'extrémité initiale (Ei) de la volute et le point déterminé (E;) de la volute autour de l'axe de rotation (Al),  9i is the angle defined by the initial end (Ei) of the volute and the determined point (E;) of the volute around the axis of rotation (Al),
ai est l'angle d'expansion initial de la volute,  ai is the initial expansion angle of the volute,
a2 est l'angle d'expansion final de la volute, a 2 is the final expansion angle of the volute,
Omax est l'angle de volute qui correspond à l'angle défini par l'extrémité initiale (Ei) de la volute et l'extrémité distale (E2) de la volute autour de l'axe de rotation (Al) et, en ce que l'angle de volute (9max) est compris entre 290 et 315 degrés. Omax is the volute angle that corresponds to the angle defined by the initial end (Ei) of the volute and the distal end (E 2 ) of the volute around the axis of rotation (Al) and, in what the volute angle (9 max ) is between 290 and 315 degrees.
2. Dispositif (10) selon l'une quelconque des revendications précédentes, caractérisé en ce que l'angle d'expansion initial (ai) est compris entre 3,5 et 9 degrés. 2. Device (10) according to any one of the preceding claims, characterized in that the initial expansion angle (ai) is between 3.5 and 9 degrees.
3. Dispositif (10) selon l'une quelconque des revendications précédentes, caractérisé en ce que l'angle d'expansion final (a2) est compris entre 3 et 5 degrés. 3. Device (10) according to any one of the preceding claims, characterized in that the final expansion angle (a 2 ) is between 3 and 5 degrees.
4. Dispositif (10) selon l'une quelconque des revendications précédentes, caractérisé en ce que la section axiale de la paroi périphérique (22) de la volute a un profil globalement en forme de « C », de préférence un profil ovalisé. 4. Device (10) according to any one of the preceding claims, characterized in that the axial section of the peripheral wall (22) of the volute has a generally "C" shaped profile, preferably an ovalized profile.
5. Dispositif (10) selon la revendication précédente, caractérisé en ce que la bouche radiale (18) de refoulement possède une section axiale de profil arrondi ou ovalisé de sorte que le tronçon de sortie (28), qui s'étend depuis l'extrémité distale (E2) de la volute jusqu'à la bouche radiale (18) de refoulement, forme progressivement un tube. 5. Device (10) according to the preceding claim, characterized in that the radial outlet mouth (18) has an axial section of rounded or oval profile so that the outlet section (28), which extends from the distal end (E 2 ) of the volute to the radial outlet mouth (18), gradually forms a tube.
6. Dispositif (10) selon l'une quelconque des revendications précédentes, caractérisé en ce que l'évolution de l'expansion axiale de la volute suit globalement l'évolution de son expansion radiale. 6. Device (10) according to any one of the preceding claims, characterized in that the evolution of the axial expansion of the volute follows globally the evolution of its radial expansion.
7. Dispositif (10) selon l'une quelconque des revendications précédentes, caractérisé en ce que le bec (24) de volute a globalement un profil ovalisé. 7. Device (10) according to any one of the preceding claims, characterized in that the spout (24) volute generally has an oval profile.
8. Dispositif (10) selon l'une quelconque des revendications précédentes, caractérisé en ce que le profil extérieur de la turbine (12), dans un plan axial, est globalement parallèle à l'axe (Al) de la turbine (12). 8. Device (10) according to any one of the preceding claims, characterized in that the outer profile of the turbine (12), in an axial plane, is generally parallel to the axis (A1) of the turbine (12) .
9. Dispositif (10) selon l'une quelconque des revendications précédentes, caractérisé en ce que le bord circonférentiel interne (30) de la volute se prolonge, du côté de la bouche axiale (16) d'aspiration, par une extension radiale (34) qui recouvre une portion de la turbine (12) et qui délimite la bouche axiale (16) d'aspiration. 9. Device (10) according to any one of the preceding claims, characterized in that the inner circumferential edge (30) of the volute is extended, on the side of the axial suction mouth (16), by a radial extension ( 34) which covers a portion of the turbine (12) and which delimits the axial suction mouth (16).
10. Dispositif (10) selon l'une quelconque des revendications précédentes, caractérisé en ce que le boîtier (22) est réalisé sous la forme de deux demi-coquilles (38, 40), de préférence réalisées par moulage en matériau plastique, les deux demi-coquilles (38, 40) étant assemblées l'une avec l'autre selon un plan de joint (42) orthogonal à l'axe (Al) de la turbine (12). 10. Device (10) according to any one of the preceding claims, characterized in that the housing (22) is in the form of two half-shells (38, 40), preferably made by molding plastic material, the two half-shells (38, 40) being assembled with each other along a joint plane (42) orthogonal to the axis (A1) of the turbine (12).
EP13729333.8A 2012-07-13 2013-06-17 Ventilation device equipped with a casing shaped as a volute housing Not-in-force EP2872783B1 (en)

Applications Claiming Priority (2)

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FR1256755A FR2993208B1 (en) 2012-07-13 2012-07-13 VENTILATION DEVICE EQUIPPED WITH A VOLUTE CONTAINING HOUSING.
PCT/EP2013/062475 WO2014009103A1 (en) 2012-07-13 2013-06-17 Ventilation device equipped with a casing shaped as a volute housing

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EP2872783A1 true EP2872783A1 (en) 2015-05-20
EP2872783B1 EP2872783B1 (en) 2016-12-07

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EP (1) EP2872783B1 (en)
JP (1) JP6256720B2 (en)
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WO (1) WO2014009103A1 (en)

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CN104411981B (en) 2016-09-21
EP2872783B1 (en) 2016-12-07
US9745983B2 (en) 2017-08-29
WO2014009103A1 (en) 2014-01-16
FR2993208A1 (en) 2014-01-17
JP2015522128A (en) 2015-08-03
US20150204337A1 (en) 2015-07-23
CN104411981A (en) 2015-03-11
JP6256720B2 (en) 2018-01-10
FR2993208B1 (en) 2016-08-05

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