EP0263000B1 - Helicoidal fan with a guiding envelope - Google Patents

Helicoidal fan with a guiding envelope Download PDF

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Publication number
EP0263000B1
EP0263000B1 EP87401940A EP87401940A EP0263000B1 EP 0263000 B1 EP0263000 B1 EP 0263000B1 EP 87401940 A EP87401940 A EP 87401940A EP 87401940 A EP87401940 A EP 87401940A EP 0263000 B1 EP0263000 B1 EP 0263000B1
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EP
European Patent Office
Prior art keywords
casing
propeller
blades
sleeve
blower according
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
Application number
EP87401940A
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German (de)
French (fr)
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EP0263000A1 (en
Inventor
Bernard Pradelle
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Orano Cycle SA
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Compagnie Generale des Matieres Nucleaires SA
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Application filed by Compagnie Generale des Matieres Nucleaires SA filed Critical Compagnie Generale des Matieres Nucleaires SA
Priority to AT87401940T priority Critical patent/ATE59887T1/en
Publication of EP0263000A1 publication Critical patent/EP0263000A1/en
Application granted granted Critical
Publication of EP0263000B1 publication Critical patent/EP0263000B1/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

Definitions

  • the invention relates to fans of the type having a tubular air flow guide envelope provided with flow straightening vanes carrying a central assembly comprising, on the one hand, an electric motor provided with an aerodynamic fairing and of which the shaft carries a propeller placed at the front of the blades and, on the other hand, a tubular casing constituting a single piece of casting with the blades and with at least one section of the envelope surrounding the propeller.
  • the present invention aims to provide a fan with an electric motor that can be produced at a cost barely higher than that of conventional industrial fans, having a significantly improved overall efficiency (ratio of useful power to power of the electric motor) and a reduced noise level.
  • the invention provides a fan of the type defined above, characterized in that the part of said section surrounding the propeller is machined concentrically inside said casing and in that the stator of the electric motor is adjusted in a bore of said housing and is in thermal contact with the housing over its entire circumference.
  • the tubular casing, the blades and the envelope section advantageously constitute a single piece of foundry made of a material having a high thermal conductivity.
  • a spheroidal graphite cast iron which is subjected to a heat treatment giving it a good coefficient of elongation and consequently, allowing it to withstand very large temperature variations.
  • the propeller blade is a machined cylindrical segment. Thanks to the use of an attached segment of short axial length, the machining of which can be carried out at the same time as that of the casing receiving the shaft and the bearings of the shaft of the electric motor, it is possible to ensure precise centering. of the propeller and reduce the radial clearance to a value of the order of a tenth of a millimeter, for which the turbulence at the end of the blade is reduced.
  • the segment can be housed in a cylindrical housing delimited by two constituent parts of the internal envelope so that the machined internal face is substantially level with the internal face of the two parts and does not cause a drop which would be a source of turbulence.
  • the segment can be formed from polytetrafluoroethylene and further machined.
  • the internal casing (or at least its central section), the straightening vanes and the casing are produced by foundry.
  • the external envelope can be produced by mechanical welding, that is to say by economic techniques.
  • the internal envelope may be integral with an external envelope separated by a soundproofing material which reduces the external noise level.
  • the reduction in turbulence also has a favorable effect on this level.
  • the fairing of the electric motor may include an inlet cone and an outlet cone reducing the pressure drops and further improving the overall efficiency.
  • the sheath may also include a converging entrance pavilion.
  • the fan shown in Figure 1 can be regarded as comprising a tubular sheath 10 for guiding the air flow and a central assembly supported by the sheath.
  • the sheath 10 is constituted, in the illustrated embodiment, in three sections or successive parts. Each of these parts has an inner wall and an outer wall.
  • the association of the internal walls constitutes an internal envelope 12 limiting the path of air circulation.
  • the external walls constitute an external envelope 14 concentric with the internal envelope and at a constant distance from the latter.
  • the front part of the sheath carries a converging horn 18 which guides the air streams and makes it possible to reduce the pressure losses.
  • This pavilion can be made of repoussé metal and fixed by welding to the internal envelope.
  • the central assembly is carried by the central part of the sheath.
  • this assembly comprises a casing 20 supported and centered in the envelope by the flow straightening vanes 22 and by a set of sails 24.
  • the vanes and the sails are distributed regularly in the circumferential direction.
  • the fixed part of the central assembly comprises the casing 20, to which is attached the stator 25 of an electric motor constituting the motor member of the fan.
  • the casing 20 is extended at the front by an entry cone 26 in the form of a warhead and, at the rear, by a shaped tip 28 so as to reduce the pressure losses.
  • the cone and the tip can be of pushed metal and fixed to the central part of the casing 20, which can be a molded part.
  • the stator 25 is mounted in a one-piece casing carrying bearings 29 on which the shaft 30 of the motor rotates. This shaft in turn carries a propeller 32, placed between the webs 24 and the flow straightening vanes 22, in the axial direction.
  • the profile, the timing and the arrangement of the blades 32 and of the straightening vanes 22 are chosen to optimize the efficiency of the assembly of the propeller and the electric motor for the expected flow.
  • a segment 34 of molded synthetic material is embedded in the internal casing 12, in line with the blades.
  • the segment 34 is machined and this operation is carried out at the same time as the machining of the bearings 29 carrying the shaft 30, that is to say - say with the same reference axis. Under these conditions, the alignment of the propeller and segment axes is precise enough to tolerate a play of the order of a tenth of a millimeter between propeller 32 and segment 34.
  • a fan intended to receive a motor from 5 to 25 kW has been constituted, with a casing 20 of 240 mm in diameter, carried by several blades (for example seventeen) of rectification 22.
  • the stator of the motor was fitted tightly in the central part of the casing 20, which ensures good cooling.
  • the propeller 32 statically and dynamically balanced, was mounted on the shaft 30 by means of a split cone 35 which guarantees the coaxiality of the shaft and the propeller.
  • the fan shown also includes the accessory elements required for its operation.
  • the motor carcass carries at the rear an electrical connection box 36 connected to a connection box 38, carried by the sheath 10, by conductors contained in a profiled tube 40.
  • the fan can also include measuring or safety elements (not shown), for example a pressure sensor located at the inlet of the fan, an engine temperature sensor, etc.
  • the sheath can also be provided with fasteners for receiving an air filter located at the front.
  • FIG. 2 in which the elements corresponding to those of FIG. 1 are designated by the same reference number, also comprises a casting part, advantageously made of spheroidal graphite cast iron, grouping together the casing 20, the blades 22 and the central section of the internal casing 12.
  • the straightening vanes 22 extend over a length exceeding that of the stator 25 of the motor.
  • These blades have a shape (indicated in phantom) adapted to that of the propeller blades 32.
  • the casing 20 is machined internally, concentrically with the part of the internal envelope which directly surrounds the propeller 32. This machining allows centering precision of the flanges 42 which carry the bearings 29 and of the stator 25.
  • the magnetic circuit of the latter is machined at its periphery so as to engage with gentle friction in the bore of the casing 20, where it is immobilized by a simple key 44.
  • a conductive grease is advantageously interposed between the casing and the ferromagnetic carcass of the motor to improve heat transfers.
  • the inlet cone 26 rotates with the propeller of which it is integral.
  • an annular segment of polytetrafluoroethylene in a groove (indicated in dashes) of the envelope section 12.
  • This segment can in particular consist of a section of large diameter polytetrafluoroethylene tube .
  • the segment is then machined concentric with the bore of the casing 20 once in place.
  • the fan can be supplemented with the same elements as those which have been represented in FIG. 1. More generally, it is possible to substitute the provisions of FIG. 2 with those of FIG. 1.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Preparation Of Compounds By Using Micro-Organisms (AREA)
  • Harvester Elements (AREA)
  • Medicines That Contain Protein Lipid Enzymes And Other Medicines (AREA)
  • Walking Sticks, Umbrellas, And Fans (AREA)
  • Separation Of Particles Using Liquids (AREA)
  • Cookers (AREA)
  • Food-Manufacturing Devices (AREA)
  • Mechanical Pencils And Projecting And Retracting Systems Therefor, And Multi-System Writing Instruments (AREA)
  • Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)

Abstract

A blower has a tubular air flow guiding sleeve. An electric motor is located coaxially within the sleeve in a casing connected to the sleeve by flow-straightening blades and a propeller is fixed to a rotary shaft of the motor and placed in front of the blades. A central unit comprises the tubular casing constituting a single casting with the blades and a part of said sleeve surrounding the propeller. A length of that part around the propeller is machined concentrically to an inner surface of said casing slidably receiving the stator of the motor. A PTFE ring may be located in a recess of the sleeve in radial alignment with the propeller blade tips.

Description

L'invention concerne les ventilateurs du type ayant une enveloppe tubulaire de guidage de flux d'air munie d'aubes de redressement d'écoulement portant un ensemble central comportant, d'une part, un moteur électrique muni d'un carénage aérodynamique et dont l'arbre porte une hélice placée à l'avant des aubes et, d'autre part, un carter tubulaire constituant une pièce unique de fonderie avec les aubes et avec au moins un tronçon de l'enveloppe entourant l'hélice.The invention relates to fans of the type having a tubular air flow guide envelope provided with flow straightening vanes carrying a central assembly comprising, on the one hand, an electric motor provided with an aerodynamic fairing and of which the shaft carries a propeller placed at the front of the blades and, on the other hand, a tubular casing constituting a single piece of casting with the blades and with at least one section of the envelope surrounding the propeller.

On connaît déjà un ventilateur industriel du type ci-dessus (US-A-2 488 945). La réalisation du cartr, des aubes et de l'enveloppe en une seule pièce de fonderie réduit le coût d'un tel ventilateur. Mais cette technique de fabrication économique a un inconvénient. Les pièces réalisées présentent une large dispersion dimensionnelle. Par conséquent, des jeux importants doivent être prévus entre pièces mobiles. Les jeux importants et les défauts de centrage provoquent des turbulences qui réduisent le rendement et qui au suplus augmentent notablement les bruits. Au surplus, le montage du stator moteur sur des nervures radiales internes du carter est peu favorable à l'écoulement de la chaleur du moteur vers la veine d'air parcourant le ventilateur.An industrial fan of the above type is already known (US-A-2,488,945). The realization of the cartridges, the blades and the envelope in a single piece of casting reduces the cost of such a fan. But this economical manufacturing technique has a drawback. The parts produced have a wide dimensional dispersion. Therefore, large clearances must be provided between moving parts. Large clearances and centering faults cause turbulence which reduces the efficiency and which at the most significantly increases the noise. Furthermore, the mounting of the motor stator on internal radial ribs of the casing is not very favorable for the flow of heat from the motor to the air flow passing through the fan.

Pour réduire les jeux, on a déjà proposé d'usiner complètement l'enveloppe. Cette solution est coûteuse et elle ne garantit pas un centrage précis.To reduce backlash, it has already been proposed to machine the envelope completely. This solution is expensive and does not guarantee precise centering.

On a également proposé (FR-A-998 558) de réaliser des ventilateurs à moteur à air comprimé dont le corps est réalisé en fonderie avec un tronçon d'enveloppe et des ailettes reliant le corps du moteur et l'enveloppe. Cette solution n'est pas transposable aux ventilateurs comportant un moteur électrique et, dans le cas où un tel moteur est utilisé, le document FR-A-998 558 utilisé une pièce de fonderie qui regroupe le carter d'un multiplicateur de vitesse, les ailettes et le tronçon d'enveloppe. Le moteur lui-même est fixé sur le carter du multiplicateur de vitesse. Cette solution est peu satisfaisante: il est difficile d'assurer un centrage convenable du moteur. Pour refroidir le moteur, il est nécessaire de munir son enveloppe d'ailettes de refroidissement qui sont source de perte de charge.It has also been proposed (FR-A-998 558) to produce fans with compressed air motor, the body of which is made in a foundry with a section of casing and fins connecting the body of the motor and the casing. This solution cannot be transposed to fans comprising an electric motor and, in the case where such a motor is used, the document FR-A-998 558 used a foundry piece which groups together the housing of a speed multiplier, the fins and the envelope section. The engine itself is attached to the gearbox housing. This solution is unsatisfactory: it is difficult to ensure proper centering of the engine. To cool the engine, it is necessary to equip its casing with cooling fins which are a source of pressure drop.

La présente invention vise à fournir un ventilateur à moteur électrique réalisable à un coût à peine supérieur à celui des ventilateurs industriels classiques, présentant un rendement global (rapport de la puissance utile à la puissance du moteur électrique) notablement amélioré et un niveau sonore réduit.The present invention aims to provide a fan with an electric motor that can be produced at a cost barely higher than that of conventional industrial fans, having a significantly improved overall efficiency (ratio of useful power to power of the electric motor) and a reduced noise level.

Dans ce but, l'invention propose un ventilateur du type ci-dessus défini, caractérisé en ce que la partie dudit troncon entourant l'hélice est usinée concentriquement à l'intérieur dudit carter et en ce que le stator du moteur électrique est ajusté dans un alésage dudit carter et est en contact thermique avec le carter sur toute sa circonférence.For this purpose, the invention provides a fan of the type defined above, characterized in that the part of said section surrounding the propeller is machined concentrically inside said casing and in that the stator of the electric motor is adjusted in a bore of said housing and is in thermal contact with the housing over its entire circumference.

On peut ainsi assurer un centrage précis de l'hélice dans le tronçon de l'enveloppe. Grâce à l'adjustage du stator du moteur dans le carter, la chaleur dégagée par le moteur électrique s'évacue à traverse le carter et les aubes de redressement qui jouent ainsi un double rôle. Une graisse conductrice, contenant par exemple du cuivre, est avantageusement interposée entre le stator usiné et le carter pour améliorer encore l'écoulement thermique. Le carter tubulaire, les aubes et le tronçon d'enveloppe constituent avantageusement une pièce unique de fonderie en un matériau ayant une conductibilité thermique élevée. On peut notamment utiliser une fonte à graphite sphéroïdal à laquelle on fait subir un traitement thermique du lui donnant un bon coefficient d'allongement et en conséquence, lui permettant de supporter des variations de température très importantes. On peut notamment utiliser la fonte connue sous la référence GS 400-12.It is thus possible to ensure precise centering of the propeller in the section of the envelope. Thanks to the adjustment of the stator of the motor in the casing, the heat released by the electric motor is evacuated through the casing and the straightening vanes which thus play a double role. A conductive grease, containing for example copper, is advantageously interposed between the machined stator and the casing to further improve the thermal flow. The tubular casing, the blades and the envelope section advantageously constitute a single piece of foundry made of a material having a high thermal conductivity. One can in particular use a spheroidal graphite cast iron which is subjected to a heat treatment giving it a good coefficient of elongation and consequently, allowing it to withstand very large temperature variations. One can in particular use the cast iron known under the reference GS 400-12.

Au droit des bouts de pale de l'hélice, est avantageusement rapporté un segment cylindrique usiné. Grâce à l'utilisation d'un segment rapporté de faible longueur axiale, dont l'usinage peut être effectué en même temps que celui du carter recevant l'arbre et des paliers de l'arbre du moteur électrique, on peut assurer un centrage précis de l'hélice et réduire le jeu radial à une valeur de l'ordre du dixième de millimètre, pour laquelle les turbulences en bout de pâle sont réduites.Advantageously, at the ends of the propeller blade, is a machined cylindrical segment. Thanks to the use of an attached segment of short axial length, the machining of which can be carried out at the same time as that of the casing receiving the shaft and the bearings of the shaft of the electric motor, it is possible to ensure precise centering. of the propeller and reduce the radial clearance to a value of the order of a tenth of a millimeter, for which the turbulence at the end of the blade is reduced.

Le segment peut être logé dans un logement cylindrique délimité par deux pièces constitutives de l'enveloppe interne de façon que la face interne usinée soit sensiblement de niveau avec la face interne des deux pièces et ne provoque pas de décrochement qui serait source de turbulence. Le segment peut être formé en polytétrafluoréthylène et usiné ultérieurement.The segment can be housed in a cylindrical housing delimited by two constituent parts of the internal envelope so that the machined internal face is substantially level with the internal face of the two parts and does not cause a drop which would be a source of turbulence. The segment can be formed from polytetrafluoroethylene and further machined.

On voit que l'enveloppe interne (ou du moins son tronçon central), les aubes de redressement et le carter sont réalisés par fonderie. L'enveloppe externe peut être réalisée par mécano-soudage, c'est-à-dire par des techniques économiques.It can be seen that the internal casing (or at least its central section), the straightening vanes and the casing are produced by foundry. The external envelope can be produced by mechanical welding, that is to say by economic techniques.

L'enveloppe interne peut être solidaire d'une enveloppe externe séparée par un matériau d'insonorisation qui réduit le niveau sonore extérieur. La diminution de turbulence a également un effet favorable sur ce niveau. Le carénage du moteur électrique peut comporter un cône d'entrée et une cône de sortie réduisant les pertes de charge et améliorant encore le rendement global. La gaine peut comporter également un pavillon d'entrée convergent.The internal envelope may be integral with an external envelope separated by a soundproofing material which reduces the external noise level. The reduction in turbulence also has a favorable effect on this level. The fairing of the electric motor may include an inlet cone and an outlet cone reducing the pressure drops and further improving the overall efficiency. The sheath may also include a converging entrance pavilion.

L'invention sera mieux comprise à la lecture de la description qui suit de modes de réalisation particuliers, donnés à titre d'exemples non limitatifs. La description se réfère aux dessins qui l'accompagnent, dans lequels:

  • -la figure 1 montre un ventilateur, en coupe suivant un plan passant par son axe; et
  • -la figure 2 montre l'ensemble central et le tronçon d'enveloppe interne qui en est solidaire d'un ventilateur selon une variante de réalisation de l'invention.
The invention will be better understood on reading the following description of particular embodiments, given by way of nonlimiting examples. The description refers to the accompanying drawings, in which:
  • FIG. 1 shows a fan, in section on a plane passing through its axis; and
  • FIG. 2 shows the central assembly and the section of internal envelope which is integral with a fan according to an alternative embodiment of the invention.

Le ventilateur montré en figure 1 peut être regardé comme comprenant une gaine tubulaire 10 de guidage du flux d'air et un ensemble central supporté par la gaine.The fan shown in Figure 1 can be regarded as comprising a tubular sheath 10 for guiding the air flow and a central assembly supported by the sheath.

La gaine 10 est constituée, dans le mode de réalisation illustré, en trois tronçons ou parties successives. Chacune de ces parties présente une paroi interne et une paroi externe. L'association des parois internes constitue une enveloppe interne 12 limitant le trajet de circulation de l'air. Les parois externes constituent une enveloppe externe 14 concentrique à l'enveloppe interne et à une distance constante de cette dernière. Un matériau insonorisant 16, tel que de la laine de roche, occupe l'intervalle entre les enveloppes 12 et 14.The sheath 10 is constituted, in the illustrated embodiment, in three sections or successive parts. Each of these parts has an inner wall and an outer wall. The association of the internal walls constitutes an internal envelope 12 limiting the path of air circulation. The external walls constitute an external envelope 14 concentric with the internal envelope and at a constant distance from the latter. A soundproofing material 16, such as rock wool, occupies the space between the envelopes 12 and 14.

La partie avant de la gaine porte un pavillon 18 convergent qui guide les filets d'air et permet de diminuer les pertes de charge. Ce pavillon peut être constitué en métal repoussé et fixé par soudage à l'enveloppe interne.The front part of the sheath carries a converging horn 18 which guides the air streams and makes it possible to reduce the pressure losses. This pavilion can be made of repoussé metal and fixed by welding to the internal envelope.

L'ensemble central est porté par la partie centrale de la gaine. Pour cela, cet ensemble comporte un carter 20 supporté et centré dans l'enveloppe par les aubes 22 de redressement d'écoulement et par un jeu de voiles 24. Les aubes et les voiles sont répartis régulièrement dans le sens circonférentiel.The central assembly is carried by the central part of the sheath. For this, this assembly comprises a casing 20 supported and centered in the envelope by the flow straightening vanes 22 and by a set of sails 24. The vanes and the sails are distributed regularly in the circumferential direction.

La partie fixe de l'ensemble central comprend le carter 20, auquel est fixé le stator 25 d'un moteur électrique constituant l'organe moteur du ventilateur. Le carter 20 se prolonge à l'avant par un cône d'entrée 26 en forme d'ogive et, à l'arrière, par une pointe 28 profilée de façon à réduire les pertes de charge. Le cône et la pointe peuvent être en métal repoussé et fixés à la partie centrale du carter 20, qui peut être une pièce moulée. Le stator 25 est monté duns un carter monobloc portant des paliers 29 sur lesquels tourne l'arbre 30 du moteur. Cet arbre porte à son tour une hélice 32, placée entre les voiles 24 et les aubes de redressement d'écoulement 22, dans le sens axial.The fixed part of the central assembly comprises the casing 20, to which is attached the stator 25 of an electric motor constituting the motor member of the fan. The casing 20 is extended at the front by an entry cone 26 in the form of a warhead and, at the rear, by a shaped tip 28 so as to reduce the pressure losses. The cone and the tip can be of pushed metal and fixed to the central part of the casing 20, which can be a molded part. The stator 25 is mounted in a one-piece casing carrying bearings 29 on which the shaft 30 of the motor rotates. This shaft in turn carries a propeller 32, placed between the webs 24 and the flow straightening vanes 22, in the axial direction.

Le profil, le calage et la disposition des pales 32 et des aubes 22 de redressement sont choisis pour optimiser le rendement de l'ensemble de l'hélice et du moteur électrique pour le débit prévu.The profile, the timing and the arrangement of the blades 32 and of the straightening vanes 22 are chosen to optimize the efficiency of the assembly of the propeller and the electric motor for the expected flow.

Pour permettre d'adopter un jeu très faible entre les extrémités des pales de l'hélice 32 et l'enveloppe, un segment 34 en matériau synthétique moulé est encastré dans l'enveloppe interne 12, au droit des pales. On peut notamment utiliser un segment 34 en polytetrafluoréthylène moulé. Pour assurer une concentricité satisfaisante de la face interne du segment 34 et de l'hélice 32, le segment 34 est usiné et cette opération est effectuée en même temps que l'usinage des paliers 29 portant l'arbre 30, c'est-à-dire avec un même axe de référence. Dans ces conditions, l'alignement des axes d'hélice et de segment est suffisamment précis pour tolérer un jeu de l'ordre du dixième de millimètre entre hélice 32 et segment 34.To allow a very small clearance to be adopted between the ends of the blades of the propeller 32 and the casing, a segment 34 of molded synthetic material is embedded in the internal casing 12, in line with the blades. One can in particular use a segment 34 in molded polytetrafluoroethylene. To ensure satisfactory concentricity of the internal face of the segment 34 and of the propeller 32, the segment 34 is machined and this operation is carried out at the same time as the machining of the bearings 29 carrying the shaft 30, that is to say - say with the same reference axis. Under these conditions, the alignment of the propeller and segment axes is precise enough to tolerate a play of the order of a tenth of a millimeter between propeller 32 and segment 34.

L'ensemble des dispositions qui viennent d'être décrites réduisent notamment les pertes de charge et, par voie de conséquence, augmentant le rendement et réduisent les bruits d'origine aéraulique. Les tourbillons en bout de pales d'hélice 32 sont réduits par la présence d'un jeu faible. La circulation de l'air autour du moteur s'effectue sans turbulences, du fait du caractère continu de la paroi le long du cône d'entrée 26, du moyeu d'hélice dont le diamètre correspond à celui de la partie centrale du carter 20 et du cône arrière 28.All of the arrangements which have just been described in particular reduce the pressure drops and, consequently, increase the efficiency and reduce the noises of aeraulic origin. The vortices at the end of propeller blades 32 are reduced by the presence of a small clearance. The air circulation around the engine takes place without turbulence, due to the continuous nature of the wall along the inlet cone 26, of the propeller hub whose diameter corresponds to that of the central part of the casing 20 and the rear cone 28.

On peut indiquer, à titre d'exemple, qu'un ventilateur prévu pour recevoir un moteur de 5 à 25 kW a été constitué, avec un carter 20 de 240 mm de diamètre, porté par plusieurs aubes (par exemple dix-sept) de redressement 22. Le stator du moteur était monté serré dans la partie centrale du carter 20, ce qui assure un bon refroidissement. L'hélice 32, équilibrée statiquement et dynamiquement, était montée sur l'arbre 30 par l'intermédiaire d'un cône fendu 35 qui garantit la coaxialité de l'arbre et de l'hélice.It may be indicated, by way of example, that a fan intended to receive a motor from 5 to 25 kW has been constituted, with a casing 20 of 240 mm in diameter, carried by several blades (for example seventeen) of rectification 22. The stator of the motor was fitted tightly in the central part of the casing 20, which ensures good cooling. The propeller 32, statically and dynamically balanced, was mounted on the shaft 30 by means of a split cone 35 which guarantees the coaxiality of the shaft and the propeller.

Le ventilateur représenté comporte encore les éléments accessoires requis pour son fonctionnement. Dans le mode de réalisation illustré, la carcasse du moteur porte à l'arrière un boîtier de raccordement électrique 36 relié à un boîte de raccordement 38, portée par la gaine 10, par des conducteurs contenus dans un tube profilé 40.The fan shown also includes the accessory elements required for its operation. In the illustrated embodiment, the motor carcass carries at the rear an electrical connection box 36 connected to a connection box 38, carried by the sheath 10, by conductors contained in a profiled tube 40.

Le ventilateur peut encore comprendre des éléments (non représentés) de mesure ou de sécurité, par exemple un capteur de pression situé à l'entrée du ventilateur, un capteur de température du moteur, etc. La gaine peut par ailleurs être pourvue d'attaches de réception d'un filtre à air situé à l'avant.The fan can also include measuring or safety elements (not shown), for example a pressure sensor located at the inlet of the fan, an engine temperature sensor, etc. The sheath can also be provided with fasteners for receiving an air filter located at the front.

La figure 2, sur laquelle les éléments correspondants à ceux de la figure 1 sont désignés par le même numéro de référence, comprend encore une pièce de fonderie, avantageusement en fonte à graphite sphéroïdal, regroupant le carter 20, les aubes 22 et le tronçon central de l'enveloppe interne 12. Pour améliorer le refroidissement, les aubes de redressement 22 s'étendent sur une longueur dépassant celle du stator 25 du moteur. Ces aubes ont une forme (indiquée en traits mixtes) adaptée à celle des pâles d'hélice 32. Le carter 20 est usiné intérieurement, concentriquement à la partie de l'enveloppe interne qui entoure directement l'hélice 32. Cet usinage permet un centrage précis des flasques 42 qui portent les roulements 29 et du stator 25. Le circuit magnétique de ce dernier est usiné à sa périphérie de façon à s'engager à frottement doux dans l'alésage du carter 20, où il est immobilisé par une simple clavette 44. Une graisse conductrice est avantageusement interposée entre le carter et la carcasse ferro-magnétique du moteur pour améliorer les transferts de chaleur.FIG. 2, in which the elements corresponding to those of FIG. 1 are designated by the same reference number, also comprises a casting part, advantageously made of spheroidal graphite cast iron, grouping together the casing 20, the blades 22 and the central section of the internal casing 12. To improve cooling, the straightening vanes 22 extend over a length exceeding that of the stator 25 of the motor. These blades have a shape (indicated in phantom) adapted to that of the propeller blades 32. The casing 20 is machined internally, concentrically with the part of the internal envelope which directly surrounds the propeller 32. This machining allows centering precision of the flanges 42 which carry the bearings 29 and of the stator 25. The magnetic circuit of the latter is machined at its periphery so as to engage with gentle friction in the bore of the casing 20, where it is immobilized by a simple key 44. A conductive grease is advantageously interposed between the casing and the ferromagnetic carcass of the motor to improve heat transfers.

Dans le cas illustré en figure 2, le cône d'entrée 26 tourne avec l'hélice dont il est solidaire. Comme dans le cas de la figure 1, il serait possible de placer un segment annulaire de polytétrafluoréthylène dans une gorge (indiquée en tirets) du tronçon d'enveloppe 12. Ce segment peut notamment être constitué par un tronçon de tube de polytétrafluoréthylène de grand diamètre. Le segment est alors usiné concentriquement à l'alésage du carter 20 une fois en place.In the case illustrated in FIG. 2, the inlet cone 26 rotates with the propeller of which it is integral. As in the case of FIG. 1, it would be possible to place an annular segment of polytetrafluoroethylene in a groove (indicated in dashes) of the envelope section 12. This segment can in particular consist of a section of large diameter polytetrafluoroethylene tube . The segment is then machined concentric with the bore of the casing 20 once in place.

On voit que le montage du moteur électrique permet de remplacer le stator sans difficulté, en enlevant uniquement la pointe 28 et le flasque arrière 42.We see that the assembly of the electric motor allows the stator to be replaced without difficulty, by removing only the tip 28 and the rear flange 42.

Le ventilateur peut être complété par les mêmes éléments que ceux qui ont été représentés en figure 1. De façon plus générale, il est possible de substituer des dispositions de la figure 2 avec celles de la figure 1.The fan can be supplemented with the same elements as those which have been represented in FIG. 1. More generally, it is possible to substitute the provisions of FIG. 2 with those of FIG. 1.

Claims (8)

1. Blower having a tubular air flow guiding sleeve (12) provided with flow straightening blades (22) carrying a central unit comprising, on the one hand, an electric motor provided with a stream lined shroud and whose shaft (30) carries a propeller (32) located forwardly of the blades and, on the other hand, a tubular casing (20) constituting a single casting with the blades (22) and with at least a section of the sleeve which surrounds the propeller (32),
characterized in that that part of said section which surrounds the propeller is machined concentrically to the inner surface of said casing and in that the sensor (25) of the electric motor is adjusted in the bore of said casing (20) and is in thermal contact with the casing over its whole circumference.
2. Blower according to claim 1, characterized in that said section of the internal sleeve carries a cylindrical segment (34) which is attached thereto and machined, confronting the tips of the blades of the propeller.
3. Blower according to claim 2, characterized in that the segment (34) is of moulded and machined polytetrafluorethylene.
4. Blower according to claim 1, 2 or 3, characterized in that said blades (22) axially extend throughout the length of the active part of the motor.
5. Blower according to claim 1, characterized in that the shroud of the electric motor comprises an intake cone (26), said casing which is of cylindrical shape and an exit cone (8).
6. Blower according to claim 1, characterized in that said tubular sleeve (12) is fastened to an external sleeve (14) and is separated therefrom by sound insulating material (16).
7. Blower according to claim 6, characterized in that the external sleeve is manufactured by welding.
8. Blower according to any one of the preceding claims, characterized in that the single casting is of spheroidal graphite cast iron.
EP87401940A 1986-09-02 1987-08-28 Helicoidal fan with a guiding envelope Expired - Lifetime EP0263000B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87401940T ATE59887T1 (en) 1986-09-02 1987-08-28 PROPELLER FAN WITH GUIDE DUCT.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8612327 1986-09-02
FR8612327A FR2603350B1 (en) 1986-09-02 1986-09-02 HELICOID FAN WITH GUIDING SHEATH

Publications (2)

Publication Number Publication Date
EP0263000A1 EP0263000A1 (en) 1988-04-06
EP0263000B1 true EP0263000B1 (en) 1991-01-09

Family

ID=9338639

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87401940A Expired - Lifetime EP0263000B1 (en) 1986-09-02 1987-08-28 Helicoidal fan with a guiding envelope

Country Status (15)

Country Link
US (1) US4780052A (en)
EP (1) EP0263000B1 (en)
AT (1) ATE59887T1 (en)
AU (1) AU611860B2 (en)
CA (1) CA1312318C (en)
DE (1) DE3767263D1 (en)
ES (1) ES2019651B3 (en)
FI (1) FI873797A (en)
FR (1) FR2603350B1 (en)
GR (1) GR3001296T3 (en)
IE (1) IE872322L (en)
IN (1) IN166551B (en)
NO (1) NO166421C (en)
PT (1) PT85634B (en)
ZA (1) ZA876554B (en)

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Also Published As

Publication number Publication date
NO873645L (en) 1988-03-03
IE872322L (en) 1988-03-02
GR3001296T3 (en) 1992-08-26
NO873645D0 (en) 1987-08-28
EP0263000A1 (en) 1988-04-06
CA1312318C (en) 1993-01-05
PT85634B (en) 1993-07-30
PT85634A (en) 1988-10-14
ATE59887T1 (en) 1991-01-15
AU611860B2 (en) 1991-06-27
NO166421B (en) 1991-04-08
FI873797A (en) 1988-03-03
FI873797A0 (en) 1987-09-01
IN166551B (en) 1990-06-09
ZA876554B (en) 1988-11-30
ES2019651B3 (en) 1991-07-01
DE3767263D1 (en) 1991-02-14
AU7774487A (en) 1988-03-10
NO166421C (en) 1991-07-17
FR2603350B1 (en) 1991-03-29
FR2603350A1 (en) 1988-03-04
US4780052A (en) 1988-10-25

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