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EP0263000A1 - Helicoidal fan with a guiding envelope - Google Patents

Helicoidal fan with a guiding envelope Download PDF

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Publication number
EP0263000A1
EP0263000A1 EP87401940A EP87401940A EP0263000A1 EP 0263000 A1 EP0263000 A1 EP 0263000A1 EP 87401940 A EP87401940 A EP 87401940A EP 87401940 A EP87401940 A EP 87401940A EP 0263000 A1 EP0263000 A1 EP 0263000A1
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EP
European Patent Office
Prior art keywords
casing
propeller
envelope
fan according
motor
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
EP87401940A
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German (de)
French (fr)
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EP0263000B1 (en
Inventor
Bernard Pradelle
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.)
Orano Demantelement SAS
Original Assignee
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
Anticipated expiration legal-status Critical
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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 envelope for guiding air flow provided with flow straightening vanes carrying a central assembly comprising a motor provided with an aerodynamic fairing and the shaft of which carries a propeller placed at the front of the blades.
  • the present invention aims to provide a fan with an electric motor achievable at a cost barely higher than that of conventional industrial fans, having a global efficiency (ratio of useful power to the power of the electric motor) significantly improved and a reduced noise level.
  • the invention provides a fan of the type defined above, characterized in that the central assembly comprises a tubular casing in one piece with the blades and with at least one section of the internal envelope, surrounding the propeller, in that the part of said section surrounding the propeller is machined concentrically inside said casing and in that the stator of the motor, of electric type, is adjusted in said casing.
  • 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 centering precision 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 casing so that the machined internal face is substantially level with the internal face of the two parts and does not cause detachment which would cause 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 viewed 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 housing 20 is extended at the front by an inlet cone 26 in the shape of a warhead and, at the rear, by a point 28 profiled 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 to the part of the internal envelope which directly surrounds the propeller 32. This machining allows precise centering 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 in friction soft 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 ferro-magnetic 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 may 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)
  • Separation Of Particles Using Liquids (AREA)
  • Harvester Elements (AREA)
  • Walking Sticks, Umbrellas, And Fans (AREA)
  • Cookers (AREA)
  • Food-Manufacturing Devices (AREA)
  • Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)
  • Mechanical Pencils And Projecting And Retracting Systems Therefor, And Multi-System Writing Instruments (AREA)
  • Medicines That Contain Protein Lipid Enzymes And Other Medicines (AREA)
  • Preparation Of Compounds By Using Micro-Organisms (AREA)

Abstract

Le ventilateur comporte une gaine tubulaire (10) de guidage de flux d'air munie d'aubes (22) de redressement d'écoulement portant un ensemble central constitué d'un moteur électrique muni d'un carénage aérodynamique et d'une hélice (32) fixée sur l'arbre (30) du moteur et placée à l'avant des aubes. La gaine (10) est constituée d'une enveloppe externe (14) et d'une enveloppe interne (12) solidaires, séparées par un matériau d'insonorisation (16). L'enveloppe interne porte, au droit des bouts de pale de l'hélice, un segment cylindrique (34) en matériau synthétique, tel que du polytetrafluoréthylène, rapporté et usiné.

Figure imgaf001
The fan comprises a tubular duct (10) for guiding air flow provided with flow straightening vanes (22) carrying a central assembly consisting of an electric motor provided with an aerodynamic fairing and a propeller ( 32) fixed on the motor shaft (30) and placed at the front of the blades. The sheath (10) consists of an external envelope (14) and an internal envelope (12) which are integral, separated by a soundproofing material (16). The internal envelope carries, to the right of the blade tips of the propeller, a cylindrical segment (34) of synthetic material, such as polytetrafluoroethylene, attached and machined.
Figure imgaf001

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 un moteur muni d'un carénage aérodynamique et dont l'arbre porte un hélice placée à l'avant des aubes.The invention relates to fans of the type having a tubular envelope for guiding air flow provided with flow straightening vanes carrying a central assembly comprising a motor provided with an aerodynamic fairing and the shaft of which carries a propeller placed at the front of the blades.

On connaît déjà des ventilateurs industriels du type ci-dessus. Pour réduire le coût d'un tel ventilateur, on utilise des techniques de fabrication aussi économiques que possible. En particulier, pour les ventilateurs industriels de grand débit, tels que ceux utilisés dans les mines, on cherche à réaliser par fonderie les composants de la gaine, les aubes de redressement et l'hélice. Mais ces techniques de fabrication économique ont 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.Industrial fans of the above type are already known. To reduce the cost of such a fan, manufacturing techniques are used that are as economical as possible. In particular, for high flow industrial fans, such as those used in mines, it is sought to produce by casting the components of the sheath, the straightening vanes and the propeller. However, these economical manufacturing techniques have 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.

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. 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 utilise 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.To reduce backlash, it has already been proposed to machine the envelope completely. This solution is expensive and does not guarantee precise centering. 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, document FR-A-998 558 uses a foundry piece which groups the casing of a speed multiplier, the fins and the envelope section. The engine itself is attached to the gearbox housing. This solution is little satisfactory: it is difficult to ensure proper centering of the motor. 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 achievable at a cost barely higher than that of conventional industrial fans, having a global efficiency (ratio of useful power to the power of the electric motor) significantly improved and a reduced noise level.

Dans ce but, l'invention propose un ventilateur du type ci-dessus défini caractérisé en ce que l'ensemble central comporte un carter tubulaire d'une seule pièce avec les aubes et avec au moins un tronçon de l'enveloppe interne, entourant l'hélice, en ce que la partie dudit tronçon entourant l'hélice est usinée concentriquement à l'intérieur dudit carter et en ce que le stator du moteur, de type électrique, est ajusté dans ledit carter.To this end, the invention provides a fan of the type defined above, characterized in that the central assembly comprises a tubular casing in one piece with the blades and with at least one section of the internal envelope, surrounding the propeller, in that the part of said section surrounding the propeller is machined concentrically inside said casing and in that the stator of the motor, of electric type, is adjusted in said casing.

On peut ainsi assurer un centrage précis de l'hélice dans le tronçon de l'enveloppe. Grâce à l'ajustage du stator du moteur dans le carter, la chaleur dégagée par le moteur électrique s'évacue à travers 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 de 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. We can especially use 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 centering precision 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 casing so that the machined internal face is substantially level with the internal face of the two parts and does not cause detachment which would cause 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 un 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:
  • - Figure 1 shows a fan, in section along a plane passing through its axis; and
  • - Figure 2 shows the central assembly and the inner envelope section 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 viewed 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 dans 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 housing 20 is extended at the front by an inlet cone 26 in the shape of a warhead and, at the rear, by a point 28 profiled 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, augmentent 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 reduce in particular 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 of 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 une 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'helice 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 to the part of the internal envelope which directly surrounds the propeller 32. This machining allows precise centering 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 in friction soft 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 ferro-magnetic 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 may 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.It can be seen that the mounting of the electric motor makes it possible to replace the stator 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 (7)

1. Ventilateur ayant une enveloppe tubulaire (12) de guidage de flux d'air munie d'aubes (22) de redressement d'écoulement portant un ensemble central comportant un moteur muni d'un carénage aérodynamique et dont l'arbre (30) porte un hélice (32) placée à l'avant des aubes, caractérisé en ce que l'ensemble central comporte un carter tubulaire (20) d'une seule pièce avec les aubes (22) et avec au moins un tronçon de l'enveloppe interne, entourant l'hélice (32), en ce que la partie dudit tronçon entourant l'hélice est usinée concentriquement à l'intérieur dudit carter et en ce que le stator du moteur, de type électrique, est ajusté dans ledit carter.1. Fan having a tubular envelope (12) for guiding air flow provided with flow straightening vanes (22) carrying a central assembly comprising a motor provided with an aerodynamic fairing and whose shaft (30) carries a propeller (32) placed at the front of the blades, characterized in that the central assembly comprises a tubular casing (20) made in one piece with the blades (22) and with at least one section of the casing internal, surrounding the propeller (32), in that the part of said section surrounding the propeller is machined concentrically inside said casing and in that the stator of the motor, of electric type, is adjusted in said casing. 2. Ventilateur selon la revendication 1, caractérisé en ce que ledit tronçon de l'enveloppe interne porte, au droit des bouts de pale de l'hélice, un segment cylindrique (34) rapporté et usiné.2. Fan according to claim 1, characterized in that said section of the internal envelope carries, to the right of the blade tips of the propeller, a cylindrical segment (34) attached and machined. 3. Ventilateur selon la revendication 2, caractérisé en ce que le segment est en polytetrafluoréthylène moulé et usiné.3. Fan according to claim 2, characterized in that the segment is made of molded and machined polytetrafluoroethylene. 4. Ventilateur selon la revendication 1, 2 ou 3, caractérisé en ce que lesdites aubes s'étendent axialement sur toute la longueur de la partie active du moteur.4. Fan according to claim 1, 2 or 3, characterized in that said blades extend axially over the entire length of the active part of the motor. 5. Ventilateur selon la revendication 1, caractérisé en ce que le carénage du moteur électrique comprend un cône d'entrée (26), ledit carter, de forme cylindrique, et un cône de sortie (28).5. Fan according to claim 1, characterized in that the fairing of the electric motor comprises an inlet cone (26), said casing, of cylindrical shape, and an outlet cone (28). 6. Ventilateur selon la revendication 1, caractérisé en ce que l'enveloppe interne (12) est solidaire d'une enveloppe externe (14) et en est séparée par un matériau d'insonorisation (16).6. Fan according to claim 1, characterized in that the internal envelope (12) is integral with an external envelope (14) and is separated from it by a soundproofing material (16). 7. Ventilateur selon la revendication 6, caractérisé en ce que l'enveloppe externe est mécano-soudée.7. Fan according to claim 6, characterized in that the outer casing is mechanically welded.
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
FR8612327A FR2603350B1 (en) 1986-09-02 1986-09-02 HELICOID FAN WITH GUIDING SHEATH
FR8612327 1986-09-02

Publications (2)

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

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EP87401940A Expired - Lifetime EP0263000B1 (en) 1986-09-02 1987-08-28 Helicoidal fan with a guiding envelope

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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) FI873797A7 (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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GB2294092A (en) * 1994-10-12 1996-04-17 Christopher Martin Dunphy Destratification fan
RU2174194C1 (en) * 2000-05-26 2001-09-27 Открытое акционерное общество "Ракетно-космическая корпорация "Энергия" им. С.П. Королева" Fan unit
RU2235912C2 (en) * 2002-09-09 2004-09-10 Открытое акционерное общество "Авиадвигатель" Gas-turbine engine multistage compressor
RU2235913C2 (en) * 2002-10-14 2004-09-10 Открытое акционерное общество "Авиадвигатель" Gas-turbine engine multistage compressor
RU2237824C1 (en) * 2003-02-03 2004-10-10 Белгородский государственный университет Vacuum gas0rotary pump
RU2243418C2 (en) * 2003-02-11 2004-12-27 Открытое акционерное общество "Авиадвигатель" Axial-flow multistage compressor of gas-turbine engine
RU2247867C2 (en) * 2000-02-18 2005-03-10 Дженерал Электрик Компани Compressor housing (versions) and compressor impeller blade
RU2381388C1 (en) * 2008-07-07 2010-02-10 Открытое акционерное общество "Научно-производственное объединение "Сатурн" Fan or compressor impeller
RU2422681C1 (en) * 2009-12-24 2011-06-27 Открытое акционерное общество "Ракетно-космическая корпорация "Энергия" имени С.П. Королева" Impeller of axial fan
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GB2294092A (en) * 1994-10-12 1996-04-17 Christopher Martin Dunphy Destratification fan
GB2294092B (en) * 1994-10-12 1999-01-06 Christopher Martin Dunphy A destratification fan
RU2247867C2 (en) * 2000-02-18 2005-03-10 Дженерал Электрик Компани Compressor housing (versions) and compressor impeller blade
RU2174194C1 (en) * 2000-05-26 2001-09-27 Открытое акционерное общество "Ракетно-космическая корпорация "Энергия" им. С.П. Королева" Fan unit
RU2235912C2 (en) * 2002-09-09 2004-09-10 Открытое акционерное общество "Авиадвигатель" Gas-turbine engine multistage compressor
RU2235913C2 (en) * 2002-10-14 2004-09-10 Открытое акционерное общество "Авиадвигатель" Gas-turbine engine multistage compressor
RU2237824C1 (en) * 2003-02-03 2004-10-10 Белгородский государственный университет Vacuum gas0rotary pump
RU2243418C2 (en) * 2003-02-11 2004-12-27 Открытое акционерное общество "Авиадвигатель" Axial-flow multistage compressor of gas-turbine engine
RU2459122C2 (en) * 2006-11-08 2012-08-20 Снекма Gas turbine engine inlet blade; gas turbine engine fan and gas turbine engine
RU2381388C1 (en) * 2008-07-07 2010-02-10 Открытое акционерное общество "Научно-производственное объединение "Сатурн" Fan or compressor impeller
RU2422681C1 (en) * 2009-12-24 2011-06-27 Открытое акционерное общество "Ракетно-космическая корпорация "Энергия" имени С.П. Королева" Impeller of axial fan
CN105402165A (en) * 2014-09-09 2016-03-16 苏州金莱克精密机械有限公司 Blower

Also Published As

Publication number Publication date
GR3001296T3 (en) 1992-08-26
AU7774487A (en) 1988-03-10
US4780052A (en) 1988-10-25
NO166421B (en) 1991-04-08
NO873645D0 (en) 1987-08-28
PT85634A (en) 1988-10-14
NO166421C (en) 1991-07-17
FI873797A0 (en) 1987-09-01
DE3767263D1 (en) 1991-02-14
ZA876554B (en) 1988-11-30
AU611860B2 (en) 1991-06-27
FR2603350B1 (en) 1991-03-29
EP0263000B1 (en) 1991-01-09
NO873645L (en) 1988-03-03
ATE59887T1 (en) 1991-01-15
FI873797A7 (en) 1988-03-03
IN166551B (en) 1990-06-09
ES2019651B3 (en) 1991-07-01
FR2603350A1 (en) 1988-03-04
PT85634B (en) 1993-07-30
IE872322L (en) 1988-03-02
CA1312318C (en) 1993-01-05

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