EP0543694B1 - Shrouding for a fan and its application in an automobile engine fan - Google Patents

Shrouding for a fan and its application in an automobile engine fan Download PDF

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Publication number
EP0543694B1
EP0543694B1 EP92402962A EP92402962A EP0543694B1 EP 0543694 B1 EP0543694 B1 EP 0543694B1 EP 92402962 A EP92402962 A EP 92402962A EP 92402962 A EP92402962 A EP 92402962A EP 0543694 B1 EP0543694 B1 EP 0543694B1
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EP
European Patent Office
Prior art keywords
axis
shell
wall
upstream
fairing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP92402962A
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German (de)
French (fr)
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EP0543694A1 (en
Inventor
Jean-Claude Vera
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ECIA Equipements et Composants pour lIndustrie Automobile SA
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ECIA Equipements et Composants pour lIndustrie Automobile SA
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Publication of EP0543694A1 publication Critical patent/EP0543694A1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/52—Casings; Connections of working fluid for axial pumps
    • F04D29/54—Fluid-guiding means, e.g. diffusers
    • F04D29/541—Specially adapted for elastic fluid pumps
    • F04D29/545—Ducts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D19/00—Axial-flow pumps
    • F04D19/002—Axial flow fans
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/32—Rotors specially for elastic fluids for axial flow pumps
    • F04D29/325—Rotors specially for elastic fluids for axial flow pumps for axial flow fans
    • F04D29/326—Rotors specially for elastic fluids for axial flow pumps for axial flow fans comprising a rotating shroud
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S415/00—Rotary kinetic fluid motors or pumps
    • Y10S415/914—Device to control boundary layer

Definitions

  • the present invention relates to fans and, more particularly, an improved fairing for the latter and its application to fan groups, for example of cars.
  • a solution of the first type is, for example, illustrated by the document FR 2 603 953.
  • This document proposes to give the blades of the propeller a profile such that the air streams close to the hub which carries the feet of the blades describe centripetal trajectories, while the air streams near the blade heads follow centrifugal trajectories.
  • a solution of the other type is, for example illustrated by document EP 0 026 997. This document proposes using a shroud for an extractor fan, placed downstream of the radiator in the direction of the flow of air.
  • This fairing includes a fixed or diffusing part with a cylindrical skirt and a mobile part with a peripheral profiled annular ferrule which is subject to the heads of the propeller blades and which is mounted coaxially with this skirt so as to be able to rotate there.
  • the air streams closest to the blade heads are ejected to form a fluid barrier which prevents the circulation of such disruptive counter-currents. It will however be observed that this solution which, in principle, prevents untimely reflux of the stirred fluid, requires a relatively large clearance between the skirt and the shell.
  • the object of the invention is to remedy this type of difficulty, especially in the case where a fan is placed upstream, in the direction of flow of the fluid, of a radiator or of an exchanger.
  • the subject of the invention is an improved fan fairing of the type described in document EP 0 026 997, all the elements of which it discloses and which are necessary for the invention are set out in the preamble to claim 1 .
  • the invention also relates to the application of such a fairing to fan units, for example from cars.
  • a fan shroud comprises a fixed part 10, usually called a diffuser, and a mobile part 20 usually a ferrule propeller, capable of turning along an axis 200.
  • the air flows are shown diagrammatically by an arrow.
  • the fixed part 10 or diffuser comprises a base 11 intended for its attachment to an exchanger E, a radiator or the like as illustrated.
  • This diffuser also includes a funnel nozzle 12 and a connection zone 13 for joining this funnel nozzle to a skirt 14.
  • the skirt 14 is preferably cylindrical and coaxial with the axis 200 while the base 11 is generally intended to be fixed on an exchanger E or rectangular radiator so that the funnel nozzle 12 has an approximately cylindro-pyramidal configuration, the cylindrical part being located upstream and the pyramidal part downstream identified with respect to the direction of flow.
  • This diffuser also comprises radial arms 15, for example three, intended to support an electric motor M for driving a shaft on which the hub of the propeller or mobile part 20 is mounted.
  • the movable part or propeller 20 comprises a profiled annular ferrule 21, blades 22 and a hub 23. As can be seen, this ferrule is delimited by an interior wall 2101, an exterior wall 2102 and a rear edge 2103.
  • This ferrule 21 comprises a flange 211, a flange 212 and an extension 213.
  • Each blade 22 comprises a head 221 towards the outside and a foot 222 towards the axis, a leading edge 223 and a trailing edge 224.
  • the heads 221 of the blades are intended for be subject to the ferrule 21 while their feet 222 are intended to be subject to the hub 23.
  • the zone 13 for connecting the diffuser 10 is delimited in particular by an internal surface 131 at the end 1310 upstream.
  • the distances which separate the axis 200 from the interior wall 2101 and from the exterior wall 2102 of the shell 21, measured at the rear edge 2103, are designated respectively by R 1 and R 2 .
  • the ferrule 21 is mounted in the skirt 14 so that its rear edge 2103 is practically situated in a plane P or in the immediate vicinity, which is perpendicular to the axis 200 and which passes practically through the upstream end 1310 of the internal surface 131 of the connection zone.
  • a bead or step 132 which is projecting internally and which is placed close from the upstream end 1310 of this connection zone.
  • this bead 132 has a profiled face 1321 of junction with, preferably a flat face 1322 configured in a radial crown.
  • This face 1321 is as it is located, in its zone which is the most close, at a distance R from the axis 200, practically equal to or little different from the distance R 1 separating this axis from the interior wall 2101 of the shell 21, measured at the rear edge 2103.
  • this face plane in radial crown 1322 is situated in the plane P or in the immediate vicinity, which is perpendicular to the axis 200 and which passes through the upstream end 1310 of the internal surface 131 of the connection zone 13.
  • the measures adopted for the bead or step 132 ensure physical or aerodynamic continuity of the inner wall 2101 of the shell 21 with the inner surface 131 of the connection zone 13, practically without any solution of continuity.
  • the transition region is as small as possible, we make sure that the axial gap a between the planar face in radial crown 1322 of the bead 132 and the rear edge 2103 of the shell 21, is practically equal to the gap radial r which separates the internal surface 141 of the skirt 14 from the external wall 2102 of the ferrule 21 which faces it.
  • the turbulent centrifugal flow at the blade heads can flare in the diffuser by "sticking" to its walls, for example by Coanda effect.
  • the fixed part is for example made, for all or part, of sheet metal or synthetic resin (s). It is the same for the mobile part.
  • the cooling performance is increased and the efficiency of the fan increased.
  • the invention finds in particular an application for radiators of automobile heat engines, whether they are with single or double fan units and especially when such fan units are placed upstream of the radiator or exchanger.

Description

La présente invention concerne les ventilateurs et, plus particulièrement, un carénage perfectionné pour ceux-ci et son application aux groupes motoventilateurs par exemple d'automobile.The present invention relates to fans and, more particularly, an improved fairing for the latter and its application to fan groups, for example of cars.

Dans de nombreux secteurs industriels, il est nécessaire d'associer un ventilateur à un radiateur ou à un autre type d'échangeur thermique. C'est par exemple le cas dans l'industrie automobile où des groupes motoventilateurs équipent les radiateurs utilisés pour le refroidissement du moteur thermique d'entraînement des véhicules ou bien les échangeurs thermiques utilisés par exemple pour la climatisation de l'habitacle des véhicules.In many industrial sectors, it is necessary to combine a fan with a radiator or another type of heat exchanger. This is for example the case in the automotive industry where motorized fan units are fitted to the radiators used for cooling the thermal engine for driving vehicles or else to the heat exchangers used for example for air conditioning the passenger compartment of vehicles.

Comme il est connu, il n'est pas facile de maîtriser les veines d'écoulement de l'air brassé par une hélice de ventilateur afin d'en améliorer l'efficacité, à débit d'air constant, sans pour autant augmenter l'énergie nécessaire à l'entraînement de l'hélice du ventilateur et aussi sans accroître de manière notable le niveau sonore en cours de fonctionnement.As is known, it is not easy to control the flow veins of the air stirred by a fan propeller in order to improve the efficiency thereof, at constant air flow, without increasing the energy required to drive the fan propeller and also without significantly increasing the noise level during operation.

Diverses tentatives ont été faites. Les unes portent sur le profil des pales de l'hélice, d'autres portent sur le carénage de l'hélice fait alors d'une partie fixe associée au radiateur ou à l'échangeur et d'une partie mobile associée aux têtes des pales du ventilateur.Various attempts have been made. Some relate to the profile of the blades of the propeller, others relate to the fairing of the propeller then made of a fixed part associated with the radiator or the exchanger and a mobile part associated with the heads of the blades. of the fan.

Une solution du premier type est, par exemple, illustrée par le document FR 2 603 953. Ce document propose de donner aux pales de l'hélice un profil tel que les filets d'air proches du moyeu qui porte les pieds des pales décrivent des trajectoires centripètes, alors que les filets d'air proches des têtes des pales suivent des trajectoires centrifuges. Une solution de l'autre type est, par exemple illustré par le document EP 0 026 997. Ce document propose d'utiliser un carénage pour un ventilateur aspirant, placé en aval du radiateur dans le sens de l'écoulement de l'air. Ce carénage comprend une partie fixe ou diffuseur avec une jupe cylindrique et une partie mobile avec une virole annulaire profilée périphérique qui est assujettie aux têtes des pales de l'hélice et qui est montée coaxialement à cette jupe de manière à pouvoir y tourner. Pour tenter de prévenir les contre-courants perturbateurs qui circulent entre jupe et virole de l'aval vers l'amont, on fait en sorte que les veines d'air les plus proches des têtes des pales soient éjectées pour faire une barrière fluide qui prévient la circulation de tels contre-courants perturbateurs. On observera toutefois que cette solution qui, en principe, empêche un reflux intempestif du fluide brassé, nécessite un jeu relativement important entre la jupe et la virole.A solution of the first type is, for example, illustrated by the document FR 2 603 953. This document proposes to give the blades of the propeller a profile such that the air streams close to the hub which carries the feet of the blades describe centripetal trajectories, while the air streams near the blade heads follow centrifugal trajectories. A solution of the other type is, for example illustrated by document EP 0 026 997. This document proposes using a shroud for an extractor fan, placed downstream of the radiator in the direction of the flow of air. This fairing includes a fixed or diffusing part with a cylindrical skirt and a mobile part with a peripheral profiled annular ferrule which is subject to the heads of the propeller blades and which is mounted coaxially with this skirt so as to be able to rotate there. In an attempt to prevent disruptive counter-currents flowing between the skirt and the ferrule from downstream to upstream, the air streams closest to the blade heads are ejected to form a fluid barrier which prevents the circulation of such disruptive counter-currents. It will however be observed that this solution which, in principle, prevents untimely reflux of the stirred fluid, requires a relatively large clearance between the skirt and the shell.

Le but de l'invention est de remédier à ce type de difficulté, tout spécialement dans le cas où un ventilateur est placé en amont, dans le sens d'écoulement du fluide, d'un radiateur ou d'un échangeur.The object of the invention is to remedy this type of difficulty, especially in the case where a fan is placed upstream, in the direction of flow of the fluid, of a radiator or of an exchanger.

L'invention a pour objet un carénage perfectionné pour ventilateur d'un type de celui exposé par le document EP 0 026 997 dont tous les éléments qu'il divulgue et qui sont nécessaires à l'invention sont exposés dans le préambuLe de la revendication 1.The subject of the invention is an improved fan fairing of the type described in document EP 0 026 997, all the elements of which it discloses and which are necessary for the invention are set out in the preamble to claim 1 .

L'invention a aussi pour objet l'application d'un tel carénage aux groupes motoventilateurs par exemple d'automobile.The invention also relates to the application of such a fairing to fan units, for example from cars.

D'autres caractéristiques et avantages de l'invention ressortiront de la lecture de la description et des revendications qui suivent, ainsi que de l'examen du dessin annexé, donné seulement à titre d'exemple, où:

  • la Figure 1 est une vue perspective partielle éclatée d'un mode de réalisation d'un carénage selon l'invention dans son application à un groupe motoventilateur pour radiateur d'automobile;
  • la Figure 2 est une coupe méridienne schématique d'un carénage selon l'invention;
  • la Figure 3 est une section locale méridienne de détail de la Figure 2, non à l'échelle pour faciliter l'illustration; et
  • la Figure 4 est une vue analogue à celle de la Figure 3 d'une variante d'exécution de l'invention.
Other characteristics and advantages of the invention will emerge from reading the description and the claims which follow, as well as from examining the appended drawing, given only by way of example, where:
  • Figure 1 is a partial exploded perspective view of an embodiment of a fairing according to the invention in its application to a fan assembly for an automobile radiator;
  • Figure 2 is a schematic meridian section of a fairing according to the invention;
  • Figure 3 is a detail local meridian of Figure 2, not to scale for ease of illustration; and
  • Figure 4 is a view similar to that of Figure 3 of an alternative embodiment of the invention.

Les ventilateurs et en particulier leur carénage, notamment ceux utilisés dans l'industrie automobile, étant bien connus dans la technique, on ne décrira dans ce qui suit que ce qui concerne directement ou indirectement l'invention. Pour le surplus, le spécialiste de la technique considérée puisera dans les solutions classiques courantes à sa disposition pour faire face aux problèmes particuliers auxquels il est confronté.As the fans and in particular their fairing, in particular those used in the automobile industry, being well known in the art, only what relates directly or indirectly to the invention will be described in the following. For the rest, the specialist in the technique considered will draw on the current conventional solutions at his disposal to deal with the particular problems with which he is confronted.

Dans ce qui suit, un même numéro de référence identifie toujours un même élément homologue quel que soit le mode de réalisation ou sa variante d'exécution.In what follows, the same reference number always identifies the same homologous element whatever either the embodiment or its variant of execution.

Pour la commodité de l'exposé, on décrira successivement chacun des constituants d'un carénage perfectionné pour ventilateur suivant l'invention avant d'en décrire le fonctionnement et sa construction.For the convenience of the description, each of the components of an improved fairing for a fan according to the invention will be described successively before describing its operation and construction.

Comme on le voit, un carénage pour ventilateur comprend une partie fixe 10, habituellement appelée diffuseur, et une partie mobile 20 habituellement une hélice à virole, apte à tourner selon un axe 200. Les flux d'air sont schématisés par une flèche.As can be seen, a fan shroud comprises a fixed part 10, usually called a diffuser, and a mobile part 20 usually a ferrule propeller, capable of turning along an axis 200. The air flows are shown diagrammatically by an arrow.

La partie fixe 10 ou diffuseur, comprend une embase 11 destinée à sa fixation sur un échangeur E, un radiateur ou similaire comme illustré. Ce diffuseur comprend aussi une buse-entonnoir 12 et une zone de raccordement 13 pour réunir cette buse-entonnoir à une jupe 14. La jupe 14 est, de préférence, cylindrique et coaxiale à l'axe 200 alors que l'embase 11 est généralement prévue pour être fixée sur un échangeur E ou radiateur rectangulaire si bien que la buse entonnoir 12 a une configuration approximativement cylindro-pyramidale, la partie cylindrique étant située à l'amont et la partie pyramidale à l'aval repéré par rapport au sens d'écoulement. Ce diffuseur comprend aussi des bras 15 radiaux, par exemple trois, destinés à supporter un moteur électrique M d'entraînement d'un arbre sur lequel est monté le moyeu de l'hélice ou partie mobile 20.The fixed part 10 or diffuser, comprises a base 11 intended for its attachment to an exchanger E, a radiator or the like as illustrated. This diffuser also includes a funnel nozzle 12 and a connection zone 13 for joining this funnel nozzle to a skirt 14. The skirt 14 is preferably cylindrical and coaxial with the axis 200 while the base 11 is generally intended to be fixed on an exchanger E or rectangular radiator so that the funnel nozzle 12 has an approximately cylindro-pyramidal configuration, the cylindrical part being located upstream and the pyramidal part downstream identified with respect to the direction of flow. This diffuser also comprises radial arms 15, for example three, intended to support an electric motor M for driving a shaft on which the hub of the propeller or mobile part 20 is mounted.

La partie mobile ou hélice 20 comprend une virole 21 annulaire profilée, des pales 22 et un moyeu 23. Comme on le voit, cette virole est délimitée par une paroi intérieure 2101, une paroi extérieure 2102 et une tranche postérieure 2103. Cette virole 21 comprend un rebord 211, une collerette 212 et un prolongement 213. Chaque pale 22 comprend une tête 221 vers l'extérieur et un pied 222 vers l'axe, un bord d'attaque 223 et un bord de fuite 224. Les têtes 221 des pales sont destinées à être assujetties à la virole 21 alors que leurs pieds 222 sont destinés à être assujettis au moyeu 23.The movable part or propeller 20 comprises a profiled annular ferrule 21, blades 22 and a hub 23. As can be seen, this ferrule is delimited by an interior wall 2101, an exterior wall 2102 and a rear edge 2103. This ferrule 21 comprises a flange 211, a flange 212 and an extension 213. Each blade 22 comprises a head 221 towards the outside and a foot 222 towards the axis, a leading edge 223 and a trailing edge 224. The heads 221 of the blades are intended for be subject to the ferrule 21 while their feet 222 are intended to be subject to the hub 23.

Comme on le voit, la zone 13 de raccordement du diffuseur 10 est délimitée notamment par une surface interne 131 d'extrémité 1310 amont.As can be seen, the zone 13 for connecting the diffuser 10 is delimited in particular by an internal surface 131 at the end 1310 upstream.

Les distances qui séparent l'axe 200 de la paroi intérieure 2101 et de la paroi extérieure 2102 de la virole 21, mesurées à la tranche postérieure 2103, sont désignées respectivement par R1 et R2.The distances which separate the axis 200 from the interior wall 2101 and from the exterior wall 2102 of the shell 21, measured at the rear edge 2103, are designated respectively by R 1 and R 2 .

Comme on le voit sur les figures du dessin, selon l'invention la virole 21 est montée dans la jupe 14 de manière que sa tranche postérieure 2103 soit pratiquement située dans un plan P ou au voisinage immédiat, qui est perpendiculaire à l'axe 200 et qui passe pratiquement par l'extrémité amont 1310 de la surface interne 131 de la zone de raccordement.As can be seen in the drawing figures, according to the invention the ferrule 21 is mounted in the skirt 14 so that its rear edge 2103 is practically situated in a plane P or in the immediate vicinity, which is perpendicular to the axis 200 and which passes practically through the upstream end 1310 of the internal surface 131 of the connection zone.

Grâce à la mise en place judicieuse que l'on vient d'indiquer, le flux d'air qui quitte l'hélice s'évase dès son entrée dans le diffuseur en "collant" à la paroi intérieure de celui-ci. Ceci a pour effet de minimiser, voire de supprimer la création d'une zone de turbulence qui se manifeste à l'état d'un tourbillon torique qui contribuerait à la formation d'un courant de reflux entre jupe et virole qui circulerait à contre-courant.Thanks to the judicious positioning which has just been indicated, the air flow which leaves the propeller flares as soon as it enters the diffuser, by "sticking" to the inner wall of the latter. This has the effect of minimizing, or even eliminating, the creation of a zone of turbulence which manifests itself in the state of a toric vortex which would contribute to the formation of a reflux current between the skirt and the ferrule which would circulate current.

Afin d'améliorer cet effet, selon une variante d'exécution de l'invention, on dispose sur la surface interne 131 de la zone de raccordement 13 du diffuseur 10, un bourrelet ou redan 132 qui est saillant intérieurement et qui est placé à proximité de l'extrémité amont 1310 de cette zone de raccordement. On fait en sorte que ce bourrelet 132 présente une face 1321 profilée de jonction avec, de préférence une face plane 1322 configurée en couronne radiale. Cette face 1321 est telle qu'elle est située, dans sa zone qui en est la plus proche, à une distance R de l'axe 200, pratiquement égale à ou peu différente de la distance R1 séparant cet axe de la paroi intérieure 2101 de la virole 21, mesurée à la tranche postérieure 2103. Selon l'invention, cette face plane en couronne radiale 1322 est située dans le plan P ou à proximité immédiate, qui est perpendiculaire à l'axe 200 et qui passe par l'extrémité amont 1310 de la surface interne 131 de la zone de raccordement 13.In order to improve this effect, according to an alternative embodiment of the invention, there is available on the internal surface 131 of the connection zone 13 of the diffuser 10, a bead or step 132 which is projecting internally and which is placed close from the upstream end 1310 of this connection zone. We make sure that this bead 132 has a profiled face 1321 of junction with, preferably a flat face 1322 configured in a radial crown. This face 1321 is as it is located, in its zone which is the most close, at a distance R from the axis 200, practically equal to or little different from the distance R 1 separating this axis from the interior wall 2101 of the shell 21, measured at the rear edge 2103. According to the invention, this face plane in radial crown 1322 is situated in the plane P or in the immediate vicinity, which is perpendicular to the axis 200 and which passes through the upstream end 1310 of the internal surface 131 of the connection zone 13.

De préférence, la distance R satisfait à la relation R = 1/3 (2R1 + R2).Preferably, the distance R satisfies the relation R = 1/3 (2R 1 + R 2 ).

Les mesures adoptées pour le bourrelet ou redan 132 assurent une continuité physique ou aérodynamique de la paroi intérieure 2101 de la virole 21 avec la surface interne 131 de la zone de raccordement 13, pratiquement sans solution de continuité.The measures adopted for the bead or step 132 ensure physical or aerodynamic continuity of the inner wall 2101 of the shell 21 with the inner surface 131 of the connection zone 13, practically without any solution of continuity.

Pour que la région de transition soit la plus réduite possible, on fait en sorte que l'écart axial a entre la face plane en couronne radiale 1322 du bourrelet 132 et la tranche postérieure 2103 de la virole 21, est pratiquement égal à l'écart radial r qui sépare la surface interne 141 de la jupe 14, de la paroi extérieure 2102 de la virole 21 qui lui fait face.So that the transition region is as small as possible, we make sure that the axial gap a between the planar face in radial crown 1322 of the bead 132 and the rear edge 2103 of the shell 21, is practically equal to the gap radial r which separates the internal surface 141 of the skirt 14 from the external wall 2102 of the ferrule 21 which faces it.

De la sorte, l'écoulement turbulent centrifuge au niveau des têtes de pale peut s'évaser dans le diffuseur en "collant" à ses parois, par exemple par effet Coanda.In this way, the turbulent centrifugal flow at the blade heads can flare in the diffuser by "sticking" to its walls, for example by Coanda effect.

L'existence de ce bourrelet ou redan crée en quelque sorte une "chicane" ou similaire, mécanique qui permet de minimiser, voire réduire à sa plus simple expression, le reflux de circulation entre la partie aval de refoulement de l'hélice et la partie amont d'aspiration.The existence of this bead or step creates in a way a "chicane" or similar, mechanical which makes it possible to minimize, or even reduce to its simplest expression, the flow backflow between the downstream part of the propeller discharge and the part upstream suction.

La partie fixe est par exemple faite, pour tout ou partie, en tôle ou en résine(s) synthétique(s). Il en est de même pour la partie mobile.The fixed part is for example made, for all or part, of sheet metal or synthetic resin (s). It is the same for the mobile part.

Grâce à l'invention, les performances de refroidissement sont accrues et le rendement du ventilateur augmenté.Thanks to the invention, the cooling performance is increased and the efficiency of the fan increased.

L'invention trouve en particulier une application pour les radiateurs de moteurs thermiques d'automobiles, qu'ils soient à groupes motoventilateurs simples ou doubles et tout spécialement lorsque de tels groupes motoventilateurs sont placés en amont du radiateur ou échangeur.The invention finds in particular an application for radiators of automobile heat engines, whether they are with single or double fan units and especially when such fan units are placed upstream of the radiator or exchanger.

On comprend tous les avantages apportés par le carénage selon l'invention.We understand all the advantages provided by the fairing according to the invention.

Claims (6)

  1. An improved fairing for a ventilator comprising, inter alia, a fixed part comprising a venturi (10) which has an attachment baseplate (11), a funnel nozzle (12), a connection area (13), a cylindrical skirt (14), and a moving part (20) - capable of turning about an axis (200) - which has a peripheral shell (21) shaped in an annular manner meant to be secured to the blade (22) heads (221) of a propeller and mounted in a coaxial manner in this skirt (14) in such a manner that it can turn therein, and where, taking as a reference the direction of the passage of the axis (200), this shell (21) is bounded by an inner wall (2101), an outer wall (2102) and a rear section (2103), the fairing being characterised in that this connection area (13) is bounded, in particular by an inside surface (131) with an end (1310) upstream thereof, and the said rear section (2103) of the shell (21) is located in a plane (P) which is perpendicular to the axis (200) and which passes the end (1310) upstream of the inside surface (131) of the connection area (13).
  2. A fairing according to Claim 1, characterised in that the inner surface (131) of the connection area (13) has a flange (132) which projects inwardly and which is positioned adjacent its end (1310) upstream thereof, and the surface (1321) of this flange (132) in its area nearest to the axis (200) is located at a distance (R) from the said axis (200) which is practically the same distance (R1) separating this axis (200) from the inside wall (2101) of the shell (21), when measured with respect to the rear section (2103).
  3. A fairing according to Claim 2, characterised in that the flange (132) is bounded in the upstream direction by a flat surface (1322) in the form of a radial ring, and this surface (1322) is located practically in the plane (P) perpendicular to the axis (22) which passes the end (1310) upstream of the inside surface (131) of the connection area (13).
  4. A fairing according to Claim 2 or 3, characterised in that the distance (R) separating the area of the surface (1321) of the flange (132) closest to the adjacent axis (200) from the said axis (200) practically satisfies the equation R = 1/3 (2R1 + R2), where R1 and R2 are the distances separating the axis (200) from the inner wall (2101) and the outer wall (2102) from the shell (21) respectively, when measured with respect to the rear section (2103).
  5. A fairing according to either Claim 3 or 4, characterised in that the radial distance (r) between the inside surface (141) of the skirt (14) and the outer wall (2102) of the opposing shell (21) is practically the same as the axial distance (a) between the flat surface in the form of a radial ring (1322) of the flange (132) and the rear section (2103) of the shell.
  6. An application of a fairing according to any of claims 1 to 5 in a engine fan unit for motor vehicles.
EP92402962A 1991-11-07 1992-11-02 Shrouding for a fan and its application in an automobile engine fan Expired - Lifetime EP0543694B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR919113755A FR2683599B1 (en) 1991-11-07 1991-11-07 IMPROVED FAIRING FOR FAN AND ITS APPLICATION TO A MOTOR FAN GROUP OF AUTOMOBILE.
FR9113755 1991-11-07

Publications (2)

Publication Number Publication Date
EP0543694A1 EP0543694A1 (en) 1993-05-26
EP0543694B1 true EP0543694B1 (en) 1996-09-04

Family

ID=9418726

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92402962A Expired - Lifetime EP0543694B1 (en) 1991-11-07 1992-11-02 Shrouding for a fan and its application in an automobile engine fan

Country Status (5)

Country Link
US (1) US5342173A (en)
EP (1) EP0543694B1 (en)
DE (1) DE69213399T2 (en)
ES (1) ES2092657T3 (en)
FR (1) FR2683599B1 (en)

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Also Published As

Publication number Publication date
DE69213399T2 (en) 1997-02-06
DE69213399D1 (en) 1996-10-10
EP0543694A1 (en) 1993-05-26
FR2683599A1 (en) 1993-05-14
FR2683599B1 (en) 1994-03-04
ES2092657T3 (en) 1996-12-01
US5342173A (en) 1994-08-30

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