EP0337883A1 - Centrifugal turbine, in particular impeller wheel, comprising radial rotor blades and an auxiliary turbine - Google Patents

Centrifugal turbine, in particular impeller wheel, comprising radial rotor blades and an auxiliary turbine Download PDF

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Publication number
EP0337883A1
EP0337883A1 EP89401008A EP89401008A EP0337883A1 EP 0337883 A1 EP0337883 A1 EP 0337883A1 EP 89401008 A EP89401008 A EP 89401008A EP 89401008 A EP89401008 A EP 89401008A EP 0337883 A1 EP0337883 A1 EP 0337883A1
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EP
European Patent Office
Prior art keywords
rotor
blades
sectors
groove
centrifugal turbine
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Granted
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EP89401008A
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German (de)
French (fr)
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EP0337883B1 (en
Inventor
Georges Mabille
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Poudres & Grenailles Metalliques (sa)
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Poudres & Grenailles Metalliques (sa)
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Priority to AT89401008T priority Critical patent/ATE85258T1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C5/00—Devices or accessories for generating abrasive blasts
    • B24C5/06—Impeller wheels; Rotor blades therefor
    • B24C5/062—Rotor blades or vanes; Locking means therefor

Definitions

  • the present invention relates to a centrifugal turbine, in particular a blasting turbine, comprising a rotor, equidistant radial blades comprising a flared foot, and sectors immobilizing the feet of the blades against one of the faces of the rotor, the ends of the sectors s' pressing against the opposite parts of the feet which they cover and which have a shape complementary to theirs.
  • a centrifugal turbine in particular a blasting turbine, comprising a rotor, equidistant radial blades comprising a flared foot, and sectors immobilizing the feet of the blades against one of the faces of the rotor, the ends of the sectors s' pressing against the opposite parts of the feet which they cover and which have a shape complementary to theirs.
  • centrifugal turbines used to spray granules on products requiring surface treatment
  • the rotor blades are subject to intense wear and must be replaced frequently so that the quality of the surface treatment is always perfect.
  • the present invention proposes more particularly to remedy this drawback, to do this, it relates to a centrifugal turbine which is characterized in that the feet of the blades are embedded in a circular groove formed in the rotor, concentrically therewith. , their length being substantially equal to the width of the groove while their height is substantially equal to the depth of the latter; and in that the sectors are fixed in the groove in which they are embedded with little play.
  • the blades whose active face is worn can be turned over on themselves by 180 ° so that their other face can in turn be used to project the granules.
  • the duration of use of these blades can therefore now be doubled, which allows a significant reduction in operating costs.
  • the centrifugal impeller When the centrifugal impeller is designed so that its rotor can rotate in both directions, the blades obviously do not have to be turned on themselves. The downtime can in this case be reduced appreciably.
  • the blades are symmetrical with respect to a plane equidistant from the front and rear faces of their plate. This arrangement leads in fact to give the same shape to the ends of the sectors and consequently to simplify the manufacture of these.
  • the successive sectors are alternately removable and irremovable.
  • the blades can thus be replaced more quickly or turned over on themselves since it suffices, to do this, to temporarily separate the removable sectors of the rotor.
  • the removable sectors are fixed in the groove by means located on the side of the face of the rotor which carries the blades while the non-removable sectors are fixed by means located on the side of the face of the rotor which is opposite to the blades.
  • the means for fixing the removable sectors are located on the face of the rotor which carries the blades because this face is the one that personnel can most easily reach from the outside.
  • the means for fixing the irremovable sectors they are located on the other face of the rotor so that they are protected against the abrasive action of the granules.
  • damping buffers are inserted between the rotor and the blades of the blades, these damping buffers being housed in blind holes made in the rotor and having a height slightly greater than the depth. blind holes.
  • the rotor is integral in rotation with an auxiliary turbine which is coaxial with it and which comprises equidistant drive fingers whose number is equal to or less than that of the blades.
  • This auxiliary turbine allows a more uniform distribution of the granules and consequently improves the performance of the centrifugal turbine.
  • At least one of the drive fingers is in the extension of a blade.
  • centrifugal turbine that can be seen in the drawings has been developed to spray metal granules on parts to be subjected to a surface treatment. It goes without saying, however, that it could be used for other purposes without going beyond the ambit of the present invention.
  • the turbine shown comprises, in a manner known per se, a casing 1 delimiting a chamber 2 containing a rotor 3 provided on its front face 4 with radial blades 5 equidistant from each other.
  • the casing 1 has an inner coating 6 intended to protect it against the abrasive action of the granules.
  • the rotor 3 it is mounted so as to be able to rotate in the direction of the arrow F under the control of a conventional motor member 7 to which it is connected by means of a transmission member 8 such as a belt. .
  • the casing 1 has on its front face 9 a feed chute 10, the outlet of which opens into the chamber 2, in an area adjacent to the axis of rotation of the rotor 3.
  • the rotor 3 has on its front face 4 a circular groove 11 having a rectangular section, this groove being concentric with the rotor 3 which is wedged on a shaft 12 carrying a pulley 13 (visible in FIG. 1) the belt 8 passes over.
  • the blades 5 consist of a rectangular plate 14 whose anterior 15 and posterior 16 faces (considering the direction of rotation of the rotor) are parallel, and a flared foot 17 projecting from the anterior and posterior faces. of the corresponding plate. They are symmetrical with respect to their median longitudinal plane, which makes it possible to install them on the rotor in two different positions offset by 180 ° with respect to each other.
  • the foot 17 of the blades has a length substantially equal to the width of the groove 11 and a height substantially equal to the depth of the latter.
  • the feet of the blades are dimensioned so that they are embedded in the groove 11 with a sufficiently small clearance to prevent the granules used during the operation of the turbine from entering said groove.
  • Sectors 18 fixed in the groove 11 lock the blades 5 on the rotor 3. These sectors all have the same length and are fitted with a small clearance in the groove 11 in order to prevent the granules from entering the latter. They each extend to plumb with the opposite faces of two successive blades, their ends being in contact with the opposite parts of the feet which they cover and which have a shape complementary to theirs.
  • the sectors 18 consist of removable sectors 18a separated from each other by irremovable sectors 18b. More specifically, the removable sectors 18a are fixed in the groove 11 by special screws 19 located on the side of the front face 4 of the rotor 3, these screws being embedded in the removable sectors so as not to be exposed to the abrasive action of the granules and requiring an appropriate tool for their installation or their removal. With particular reference to FIG. 4, it will be noted that an O-ring 20 is inserted between the head of the screws 19 and the corresponding removable sector in order to prevent the passage of the granules towards the bottom of the groove 11.
  • the irremovable sectors 18b are fixed in the groove 11 by screws 21 situated on the side of the rear face 22 of the rotor and are thus protected against the abrasive action of the granules.
  • the rotor 3 carries three removable sectors 18a and three irremovable sectors 18b since it is provided with six blades.
  • cylindrical buffers 23 are inserted between the rotor 3 and the plates 14 of the blades. These pads, which are housed in blind holes 24 formed in the rotor and have a height slightly greater than the depth of the latter, are in fact intended to stabilize the blades on the rotor and to prevent the formation of noise during the operation of the turbine.
  • the blades 5 extend from the periphery of the rotor to a predetermined constant distance from the center thereof, in order to allow the installation of an auxiliary turbine 25.
  • This auxiliary turbine which is coaxial with the rotor, is fixed to the shaft 12 by a screw 26 and comprises four equidistant drive fingers 27 whose length is substantially equal to the height of the blades 5.
  • the Applicant found that the operation of the centrifugal turbine was satisfactory not only when the number of drive fingers of the auxiliary turbine was equal to the number of the rotor blades, but also when it was lower. It also noted that the angular position of the drive fingers with respect to the blades could be arbitrary, but that it was however preferable that at least one of the drive fingers was in the extension of a blade.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
  • Supercharger (AREA)

Abstract

The centrifugal turbine according to the present invention is essentially characterised in that its rotor (3) possesses on one of its faces a circular groove (11) concentric with it; in that the blades (5) of its rotor are formed by an insert (14) having an anterior face and a posterior face which are mutually parallel, and by a flared foot projecting on the anterior and posterior faces of the corresponding insert, the foot of the blades having a length substantially equal to the width of the groove and a height substantially equal to the depth thereof; and in that sectors (18) fixed in the groove each extend substantially flush with the faces opposite two successive blades, the ends of these sectors being in contact with the parts facing the feet which they cover and which have a shape complementary to their own. <IMAGE>

Description

La présente invention concerne une turbine centrifuge, notamment une turbine de grenaillage, comprenant un rotor, des pales radiales équidistantes comportant un pied évasé, et des secteurs immobilisant les pieds des pales contre l'une des faces du rotor, les extrémités des secteurs s'appuyant contre les parties en regard des pieds qu'elles recouvrent et qui ont une forme complémentaire de la leur.The present invention relates to a centrifugal turbine, in particular a blasting turbine, comprising a rotor, equidistant radial blades comprising a flared foot, and sectors immobilizing the feet of the blades against one of the faces of the rotor, the ends of the sectors s' pressing against the opposite parts of the feet which they cover and which have a shape complementary to theirs.

Dans les turbines centrifuges utilisées pour projeter des granules sur des produits nécessitant un traitement de surface, les pales du rotor sont soumises à une usure intense et doivent être remplacées fréquemment pour que la qualité du traitement de surface soit toujours parfaite.In centrifugal turbines used to spray granules on products requiring surface treatment, the rotor blades are subject to intense wear and must be replaced frequently so that the quality of the surface treatment is always perfect.

Le remplacement des pales a toutefois l'inconvénient de nécessiter une immobilisation relativement longue de la turbine et d'être coûteux en matière, les pales usagées étant purement et simplement mises au rebut.The replacement of the blades, however, has the disadvantage of requiring a relatively long immobilization of the turbine and of being costly in material, the used blades being purely and simply discarded.

La présente invention se propose plus particulièrement de remédier à cet inconvénient, pour ce faire, elle a pour objet une turbine centrifuge qui se caractérise en ce que les pieds des pales sont encastrés dans une gorge circulaire ménagée dans le rotor, concentriquement avec celui-ci, leur longueur étant sensiblement égale à la largeur de la gorge alors que leur hauteur est sensiblement égale à la profondeur de cette dernière ; et en ce que les secteurs sont fixés dans la gorge dans laquelle ils sont encastrés avec un faible jeu.The present invention proposes more particularly to remedy this drawback, to do this, it relates to a centrifugal turbine which is characterized in that the feet of the blades are embedded in a circular groove formed in the rotor, concentrically therewith. , their length being substantially equal to the width of the groove while their height is substantially equal to the depth of the latter; and in that the sectors are fixed in the groove in which they are embedded with little play.

Grâce à cet ensemble de dispositions, les pales dont la face active est usée peuvent être retournées sur elles-mêmes de 180° de sorte que leur autre face peut à son tour être utilisée pour projeter les granules. La durée d'utilisation de ces pales peut donc maintenant être doublée, ce qui permet une réduction appréciable des frais d'exploitation.Thanks to this set of arrangements, the blades whose active face is worn can be turned over on themselves by 180 ° so that their other face can in turn be used to project the granules. The duration of use of these blades can therefore now be doubled, which allows a significant reduction in operating costs.

Lorsque la turbine centrifuge est conçue pour que son rotor puisse tourner dans les deux sens, les pales n'ont évidemment pas à être retournées sur elles-mêmes. Les temps morts peuvent dans ce cas être réduits de façon appréciable.When the centrifugal impeller is designed so that its rotor can rotate in both directions, the blades obviously do not have to be turned on themselves. The downtime can in this case be reduced appreciably.

Il est souhaitable que les pales soient symétriques par rapport à un plan équidistant des faces antérieure et postérieure de leur plaquette. Cette disposition conduit en effet à donner la même forme aux extrémités des secteurs et par suite à simplifier la fabrication de ces derniers.It is desirable that the blades are symmetrical with respect to a plane equidistant from the front and rear faces of their plate. This arrangement leads in fact to give the same shape to the ends of the sectors and consequently to simplify the manufacture of these.

De préférence, les secteurs successifs sont alternativement amovibles et inamovibles. Les pales peuvent ainsi être plus rapidement remplacées ou retournées sur elles-mêmes puisqu'il suffit, pour ce faire, de séparer momentanément les secteurs amovibles du rotor.Preferably, the successive sectors are alternately removable and irremovable. The blades can thus be replaced more quickly or turned over on themselves since it suffices, to do this, to temporarily separate the removable sectors of the rotor.

Avantageusement, les secteurs amovibles sont fixés dans la gorge par des moyens situés du côté de la face du rotor qui porte les pales tandis que les secteurs inamovibles le sont par des moyens situés du côté de la face du rotor qui est opposée aux pales.Advantageously, the removable sectors are fixed in the groove by means located on the side of the face of the rotor which carries the blades while the non-removable sectors are fixed by means located on the side of the face of the rotor which is opposite to the blades.

Les moyens de fixation des secteurs amovibles sont situés sur la face du rotor qui porte les pales car cette face est celle que le personnel peut le plus facilement atteindre depuis l'extérieur. Quant aux moyens de fixation des secteurs inamovibles, ils sont situés sur l'autre face du rotor pour qu'ils soient protégés contre l'action abrasive des granules.The means for fixing the removable sectors are located on the face of the rotor which carries the blades because this face is the one that personnel can most easily reach from the outside. As for the means for fixing the irremovable sectors, they are located on the other face of the rotor so that they are protected against the abrasive action of the granules.

Pour éviter la formation de bruit et tenir compte des tolérances de fabrication, des tampons amortisseurs sont insérés entre le rotor et les plaquettes des pales, ces tampons amortisseurs étant logés dans des trous borgnes réalisés dans le rotor et ayant une hauteur légèrement supérieure à la profondeur des trous borgnes.To avoid the formation of noise and to take account of manufacturing tolerances, damping buffers are inserted between the rotor and the blades of the blades, these damping buffers being housed in blind holes made in the rotor and having a height slightly greater than the depth. blind holes.

Selon un mode de réalisation particulier de l'invention, le rotor est solidaire en rotation d'une turbine auxiliaire qui lui est coaxiale et qui comporte des doigts d'entraînement équidistants dont le nombre est égal ou inférieur à celui des pales.According to a particular embodiment of the invention, the rotor is integral in rotation with an auxiliary turbine which is coaxial with it and which comprises equidistant drive fingers whose number is equal to or less than that of the blades.

Cette turbine auxiliaire permet une répartition plus uniforme des granules et améliore par conséquent les performances de la turbine centrifuge.This auxiliary turbine allows a more uniform distribution of the granules and consequently improves the performance of the centrifugal turbine.

De préférence, l'un au moins des doigts d'entraînement est dans le prolongement d'une pale.Preferably, at least one of the drive fingers is in the extension of a blade.

Un mode d'exécution de la présente invention sera décrit ci-après à titre d'exemple nullement limitatif en référence aux dessins annexés dans lesquels :

  • - la figure 1 est une vue en coupe schématique d'une turbine centrifuge conforme à l'invention, cette vue en coupe ayant été réalisée selon la ligne 1-1 de la figure 2 ;
  • - la figure 2 est une vue en coupe schématique et partielle effectuée selon la ligne II-II de la figure 1 ;
  • - la figure 3 et une vue de face partielle et à échelle agrandie du rotor de la turbine centrifuge ; et
  • - la figure 4 est une vue en coupe effectuée selon la ligne IV-IV de la figure 3.
An embodiment of the present invention will be described below by way of nonlimiting example with reference to the accompanying drawings in which:
  • - Figure 1 is a schematic sectional view of a centrifugal turbine according to the invention, this sectional view having been taken along line 1-1 of Figure 2;
  • - Figure 2 is a schematic and partial sectional view taken along the line II-II of Figure 1;
  • - Figure 3 and a partial front view on an enlarged scale of the rotor of the centrifugal turbine; and
  • - Figure 4 is a sectional view taken along line IV-IV of Figure 3.

La turbine centrifuge que l'on peut voir sur les dessins a été mise au point pour projeter des granules métalliques sur des pièces devant subir un traitement de surface. Il va de soi cependant qu'elle pourrait être utilisée à d'autres fins sans que l'on sorte pour autant du cadre de la présente invention.The centrifugal turbine that can be seen in the drawings has been developed to spray metal granules on parts to be subjected to a surface treatment. It goes without saying, however, that it could be used for other purposes without going beyond the ambit of the present invention.

La turbine représentée comprend d'une manière connue en soi un carter 1 délimitant une chambre 2 renfermant un rotor 3 pourvu sur sa face antérieure 4 de pales radiales 5 équidistantes les unes des autres.The turbine shown comprises, in a manner known per se, a casing 1 delimiting a chamber 2 containing a rotor 3 provided on its front face 4 with radial blades 5 equidistant from each other.

Le carter 1 comporte un revêtement intérieur 6 destiné à le protéger contre l'action abrasive des granules. Quant au rotor 3, il est monté de manière à pourvoir tourner dans le sens de la flèche F sous la commande d'un organe moteur classique 7 auquel il est relié par l'intermédiaire d'un organe de transmission 8 tel qu'une courroie.The casing 1 has an inner coating 6 intended to protect it against the abrasive action of the granules. As for the rotor 3, it is mounted so as to be able to rotate in the direction of the arrow F under the control of a conventional motor member 7 to which it is connected by means of a transmission member 8 such as a belt. .

En se référant à la figure 2, on remarquera que le carter 1 comporte sur sa face antérieure 9 une goulotte d'alimentation 10 dont la sortie débouche dans la chambre 2, dans une zone adjacente à l'axe de rotation du rotor 3.Referring to FIG. 2, it will be noted that the casing 1 has on its front face 9 a feed chute 10, the outlet of which opens into the chamber 2, in an area adjacent to the axis of rotation of the rotor 3.

Conformément à l'invention, le rotor 3 comporte sur sa face antérieure 4 une gorge circulaire 11 ayant une section rectangulaire, cette gorge étant concentrique avec le rotor 3 qui est calé sur un arbre 12 portant une poulie 13 (visible sur la figure 1) sur laquelle passe la courroie 8.According to the invention, the rotor 3 has on its front face 4 a circular groove 11 having a rectangular section, this groove being concentric with the rotor 3 which is wedged on a shaft 12 carrying a pulley 13 (visible in FIG. 1) the belt 8 passes over.

Par ailleurs, les pales 5 sont constituées d'une plaquette rectangulaire 14 dont les faces antérieure 15 et postérieure 16 (en considérant le sens de rotation du rotor) sont parallèles, et d'un pied évasé 17 faisant saillie sur les faces antérieure et postérieure de la plaquette correspondante. Elles sont symétriques par rapport à leur plan longitudinal médian, ce qui permet de les installer sur le rotor dans deux positions différentes décalées de 180° l'une par rapport à l'autre.Furthermore, the blades 5 consist of a rectangular plate 14 whose anterior 15 and posterior 16 faces (considering the direction of rotation of the rotor) are parallel, and a flared foot 17 projecting from the anterior and posterior faces. of the corresponding plate. They are symmetrical with respect to their median longitudinal plane, which makes it possible to install them on the rotor in two different positions offset by 180 ° with respect to each other.

En se référant plus particulièrement aux figures 2 et 3, on remarquera que le pied 17 des pales a une longueur sensiblement égale à la largeur de la gorge 11 et une hauteur sensiblement égale à la profondeur de cette dernière.Referring more particularly to Figures 2 and 3, it will be noted that the foot 17 of the blades has a length substantially equal to the width of the groove 11 and a height substantially equal to the depth of the latter.

En fait, les pieds des pales sont dimentionnés de façon à ce qu'ils soient encastrés dans la gorge 11 avec un jeu suffisamment faible pour empêcher les granules utilisées pendant le fonctionnement de la turbine de pénétrer dans ladite gorge.In fact, the feet of the blades are dimensioned so that they are embedded in the groove 11 with a sufficiently small clearance to prevent the granules used during the operation of the turbine from entering said groove.

Des secteurs 18 fixés dans la gorge 11 verrouillent les pales 5 sur le rotor 3. Ces secteurs ont tous la même longueur et sont encastrés avec un faible jeu dans la gorge 11 afin d'empêcher les granules de pénétrer dans cette dernière. Ils s'étendent chacun jusqu'à l'aplomb des faces en regard de deux pales successives, leurs extrémités étant en contact avec les parties en regard des pieds qu'elles recouvrent et qui ont une forme complémentaire de la leur.Sectors 18 fixed in the groove 11 lock the blades 5 on the rotor 3. These sectors all have the same length and are fitted with a small clearance in the groove 11 in order to prevent the granules from entering the latter. They each extend to plumb with the opposite faces of two successive blades, their ends being in contact with the opposite parts of the feet which they cover and which have a shape complementary to theirs.

On notera ici que les secteurs 18 sont constitués de secteurs amovibles 18a séparés les uns des autres par des secteurs inamovibles 18b. Plus précisément, les secteurs amovibles 18a sont fixés dans la gorge 11 par des vis spéciales 19 situées du côté de la face antérieure 4 du rotor 3, ces vis étant encastrées dans les secteurs amovibles pour ne pas être exposées à l'action abrasive des granules et nécessitant un outil approprié pour leur mise en place ou leur retrait. En se référant plus particulièrement à la figure 4, on remarquera qu'un joint torique 20 est inséré entre la tête des vis 19 et le secteur amovible correspondant afin d'empêcher le passage des granules vers le fond de la gorge 11.It will be noted here that the sectors 18 consist of removable sectors 18a separated from each other by irremovable sectors 18b. More specifically, the removable sectors 18a are fixed in the groove 11 by special screws 19 located on the side of the front face 4 of the rotor 3, these screws being embedded in the removable sectors so as not to be exposed to the abrasive action of the granules and requiring an appropriate tool for their installation or their removal. With particular reference to FIG. 4, it will be noted that an O-ring 20 is inserted between the head of the screws 19 and the corresponding removable sector in order to prevent the passage of the granules towards the bottom of the groove 11.

De leur côté, les secteurs inamovibles 18b sont fixés dans la gorge 11 par des vis 21 situées du côté de la face postérieure 22 du rotor et se trouvent ainsi protégées contre l'action abrasive des granules.For their part, the irremovable sectors 18b are fixed in the groove 11 by screws 21 situated on the side of the rear face 22 of the rotor and are thus protected against the abrasive action of the granules.

Il va de soi que pour remplacer les pales ou pour les retourner de 180°, il suffit d'enlever momentanément les secteurs amovibles 18a.It goes without saying that to replace the blades or to turn them 180 °, it suffices to temporarily remove the removable sectors 18a.

Dans l'exemple de réalisation représenté, le rotor 3 porte trois secteurs amovibles 18a et trois secteurs inamovibles 18b puisqu'il est pourvu de six pales. On pourrait toutefois modifier le nombre des secteurs amovibles et inamovibles si l'on souhaitait modifier le nombre des pales pour qu'il soit par exemple égal à deux, quatre ou huit.In the embodiment shown, the rotor 3 carries three removable sectors 18a and three irremovable sectors 18b since it is provided with six blades. One could however modify the number of the removable and irremovable sectors if one wanted to modify the number of blades so that it is for example equal to two, four or eight.

Comme on peut par ailleurs le voir sur les figures 2 et 3, des tampons cylindriques 23 sont insérés entre le rotor 3 et les plaquettes 14 des pales. Ces tampons, qui sont logés dans des trous borgnes 24 ménagés dans le rotor et ont une hauteur légèrement supérieure à la profondeur de ces derniers, sont en fait destinés à stabiliser les pales sur le rotor et à empêcher la formation de bruit pendant le fonctionnement de la turbine.As can also be seen in FIGS. 2 and 3, cylindrical buffers 23 are inserted between the rotor 3 and the plates 14 of the blades. These pads, which are housed in blind holes 24 formed in the rotor and have a height slightly greater than the depth of the latter, are in fact intended to stabilize the blades on the rotor and to prevent the formation of noise during the operation of the turbine.

Pour être complet, on précisera que les pales 5 s'étendent depuis la périphérie du rotor jusqu'à une distance constante prédéterminée du centre de celui-ci, afin de permettre l'installation d'une turbine auxiliaire 25.To be complete, it will be specified that the blades 5 extend from the periphery of the rotor to a predetermined constant distance from the center thereof, in order to allow the installation of an auxiliary turbine 25.

Cette turbine auxiliaire, qui est coaxiale avec le rotor, est fixée sur l'arbre 12 par une vis 26 et comporte quatre doigts d'entraînement équidistants 27 dont la longueur est sensiblement égale à la hauteur des pales 5.This auxiliary turbine, which is coaxial with the rotor, is fixed to the shaft 12 by a screw 26 and comprises four equidistant drive fingers 27 whose length is substantially equal to the height of the blades 5.

Au cours des essais qu'elle a effectués, la Demanderesse a constaté que le fonctionnement de la turbine centrifuge était satisfaisant non seulement lorsque le nombre des doigts d'entraînement de la turbine auxiliaire était égal au nombre des pales du rotor, mais également lorsqu'il était inférieur. Elle a également constaté que la position angulaire des doigts d'entraînement par rapport aux pales pouvait être quelconque, mais qu'il était toutefois préférable que l'un au moins des doigts d'entraînement soit dans le prolongement d'une pale.During the tests it carried out, the Applicant found that the operation of the centrifugal turbine was satisfactory not only when the number of drive fingers of the auxiliary turbine was equal to the number of the rotor blades, but also when it was lower. It also noted that the angular position of the drive fingers with respect to the blades could be arbitrary, but that it was however preferable that at least one of the drive fingers was in the extension of a blade.

Claims (7)

1. Turbine centrifuge, notamment turbine de grenaillage, comprenant un rotor (3), des pales radiales équidistantes (5) comportant un pied évasé (17), et des secteurs (18) immobilisant les pieds (17) des pales (5) contre l'une des faces du rotor (3), les extrémités des secteurs s'appuyant contre les parties en regard des pieds (17) qu'elles recouvrent et qui ont une forme complémentaire de la leur, caractérisée en ce que les pieds (17) des pales (5) sont encastrés dans une gorge circulaire (11) ménagée dans le rotor (3), concentriquement avec celui-ci, leur longueur étant sensiblement égale à la largeur de la gorge (11) alors que leur hauteur est sensiblement égale à la profondeur de cette dernière ; et en ce que les secteurs (18) sont fixés dans la gorge (11) dans laquelle ils sont encastrés avec un faible jeu.1. Centrifugal turbine, in particular blasting turbine, comprising a rotor (3), equidistant radial blades (5) comprising a flared foot (17), and sectors (18) immobilizing the feet (17) of the blades (5) against one of the faces of the rotor (3), the ends of the sectors pressing against the opposite parts of the feet (17) which they cover and which have a shape complementary to theirs, characterized in that the feet (17 ) blades (5) are embedded in a circular groove (11) formed in the rotor (3), concentrically with the latter, their length being substantially equal to the width of the groove (11) while their height is substantially equal at the depth of the latter; and in that the sectors (18) are fixed in the groove (11) in which they are embedded with little play. 2. Turbine centrifuge selon la revendication 1, caractérisée en ce que les secteurs successifs (18) sont alternativement amovibles et inamovibles.2. Centrifugal turbine according to claim 1, characterized in that the successive sectors (18) are alternately removable and irremovable. 3. Turbine centrifuge selon la revendication 2, caractérisée en ce que les secteurs amovibles (18a) sont fixés dans la gorge (11) par des moyens (19) situés du côté de la face du rotor (3) qui porte les pales (5) tandis que les secteurs inamovibles (18b) le sont par des moyens (21) situés du côté de la face du rotor (3) qui est opposée aux pales (5).3. Centrifugal turbine according to claim 2, characterized in that the removable sectors (18a) are fixed in the groove (11) by means (19) located on the side of the face of the rotor (3) which carries the blades (5 ) while the irremovable sectors (18b) are by means (21) located on the side of the face of the rotor (3) which is opposite to the blades (5). 4. Turbine centrifuge selon l'une quelconque des revendications précédentes, caractérisée en ce que des tampons amortisseurs (23) sont insérés entre le rotor (3) et les plaquettes (14) des pales (5).4. Centrifugal turbine according to any one of the preceding claims, characterized in that damping buffers (23) are inserted between the rotor (3) and the plates (14) of the blades (5). 5. Turbine centrifuge selon la revendication 4, caractérisée en ce que les tampons amortisseurs (23) sont logés dans des trous borgnes (24) réalisés dans le rotor (3) et ont une hauteur légèrement supérieure à la profondeur des trous borgnes.5. Centrifugal turbine according to claim 4, characterized in that the damping buffers (23) are housed in blind holes (24) made in the rotor (3) and have a height slightly greater than the depth of the blind holes. 6. Turbine centrifuge selon l'une quelconque des revendications précédentes, caractérisée en ce que le rotor (3) est solidaire en rotation d'une turbine auxiliaire (25) qui lui est coaxiale et qui comporte des doigts d'entraînement équidistants (27) dont le nombre est égal ou inférieur à celui des pales (5).6. Centrifugal turbine according to any one of the preceding claims, characterized in that the rotor (3) is integral in rotation with an auxiliary turbine (25) which is coaxial with it and which comprises equidistant drive fingers (27) the number of which is equal to or less than that of the blades (5). 7. Turbine centrifuge selon la revendication 6, caractérisée en ce que l'un au moins des doigts d'entraînement (27) est dans le prolongement d'une pale (5).7. Centrifugal turbine according to claim 6, characterized in that at least one of the drive fingers (27) is in the extension of a blade (5).
EP89401008A 1988-04-13 1989-04-12 Centrifugal turbine, in particular impeller wheel, comprising radial rotor blades and an auxiliary turbine Expired - Lifetime EP0337883B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89401008T ATE85258T1 (en) 1988-04-13 1989-04-12 CENTRIFUGAL TURBINE, IN PARTICULAR CENTRIFUGAL WHEEL, WITH A ROTOR WITH RADIAL BLADES AND AN AUXILIARY TURBINE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8804893 1988-04-13
FR888804893A FR2630031B1 (en) 1988-04-13 1988-04-13 CENTRIFUGAL TURBINE, IN PARTICULAR BLASTING TURBINE, COMPRISING A ROTOR WITH RADIAL BLADES AND AN AUXILIARY TURBINE

Publications (2)

Publication Number Publication Date
EP0337883A1 true EP0337883A1 (en) 1989-10-18
EP0337883B1 EP0337883B1 (en) 1993-02-03

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EP89401008A Expired - Lifetime EP0337883B1 (en) 1988-04-13 1989-04-12 Centrifugal turbine, in particular impeller wheel, comprising radial rotor blades and an auxiliary turbine

Country Status (5)

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EP (1) EP0337883B1 (en)
AT (1) ATE85258T1 (en)
DE (2) DE68904675D1 (en)
ES (1) ES2013977A4 (en)
FR (1) FR2630031B1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2663579A1 (en) * 1990-06-25 1991-12-27 Poudres Grenailles Metalliques Abrasive particle blasting spinner wheel including blades with heels

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2108005A (en) * 1935-07-25 1938-02-08 Pangborn Corp Abrading apparatus
US2108211A (en) * 1934-05-17 1938-02-15 Pangborn Corp Abrading machine
FR1505516A (en) * 1966-11-02 1967-12-15 Centrifugal projection wheel
DE1677143B1 (en) * 1962-12-11 1969-09-11 Badische Maschf Gmbh Blast wheel with detachable blade attachment

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2108211A (en) * 1934-05-17 1938-02-15 Pangborn Corp Abrading machine
US2108005A (en) * 1935-07-25 1938-02-08 Pangborn Corp Abrading apparatus
DE1677143B1 (en) * 1962-12-11 1969-09-11 Badische Maschf Gmbh Blast wheel with detachable blade attachment
FR1505516A (en) * 1966-11-02 1967-12-15 Centrifugal projection wheel

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2663579A1 (en) * 1990-06-25 1991-12-27 Poudres Grenailles Metalliques Abrasive particle blasting spinner wheel including blades with heels

Also Published As

Publication number Publication date
DE337883T1 (en) 1990-07-26
ES2013977A4 (en) 1990-06-16
DE68904675D1 (en) 1993-03-18
ATE85258T1 (en) 1993-02-15
EP0337883B1 (en) 1993-02-03
FR2630031B1 (en) 1994-08-05
FR2630031A1 (en) 1989-10-20

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