EP3633205B1 - System for driving a pump impeller - Google Patents

System for driving a pump impeller Download PDF

Info

Publication number
EP3633205B1
EP3633205B1 EP19201286.2A EP19201286A EP3633205B1 EP 3633205 B1 EP3633205 B1 EP 3633205B1 EP 19201286 A EP19201286 A EP 19201286A EP 3633205 B1 EP3633205 B1 EP 3633205B1
Authority
EP
European Patent Office
Prior art keywords
shaft
wheel
impeller
hub
shape
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.)
Active
Application number
EP19201286.2A
Other languages
German (de)
French (fr)
Other versions
EP3633205A1 (en
Inventor
Joël Ballu
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.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP3633205A1 publication Critical patent/EP3633205A1/en
Application granted granted Critical
Publication of EP3633205B1 publication Critical patent/EP3633205B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

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
    • F04D29/18—Rotors
    • F04D29/20—Mounting rotors on shafts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H11/00—Marine propulsion by water jets
    • B63H11/02—Marine propulsion by water jets the propulsive medium being ambient water
    • B63H11/04—Marine propulsion by water jets the propulsive medium being ambient water by means of pumps
    • B63H11/08—Marine propulsion by water jets the propulsive medium being ambient water by means of pumps of rotary type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H23/00—Transmitting power from propulsion power plant to propulsive elements
    • B63H23/32—Other parts
    • B63H23/34—Propeller shafts; Paddle-wheel shafts; Attachment of propellers on shafts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D1/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F04D1/04—Helico-centrifugal pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/04—Shafts or bearings, or assemblies thereof
    • F04D29/043—Shafts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H23/00—Transmitting power from propulsion power plant to propulsive elements
    • B63H23/32—Other parts
    • B63H23/34—Propeller shafts; Paddle-wheel shafts; Attachment of propellers on shafts
    • B63H2023/346—Propeller shafts; Paddle-wheel shafts; Attachment of propellers on shafts comprising hollow shaft members
    • 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
    • F04D29/02—Selection of particular materials
    • F04D29/026—Selection of particular materials especially adapted for liquid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2240/00—Components
    • F05D2240/60—Shafts
    • F05D2240/61—Hollow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2300/00—Materials; Properties thereof
    • F05D2300/60—Properties or characteristics given to material by treatment or manufacturing
    • F05D2300/603—Composites; e.g. fibre-reinforced

Definitions

  • the present invention relates to a system for driving a pump wheel.
  • a pump consists of a mobile unit, that is to say a wheel or propeller, attached to a shaft which drives the wheel; the mobile assembly rotates in the body of the pump which constitutes a space of revolution around the axis of the shaft.
  • the fluid passes through the small diameter of the impeller and exits through the large diameter; at its exit from the wheel, the fluid is delivered at a higher pressure than at its inlet.
  • the wheel consists of a set of blades, regularly located on a frustoconical type shape called a hub.
  • Two successive vanes of a wheel and the portion of the hub located between these two vanes, as well as the portion of the pump body located between these two vanes, constitute a channel: three sides of this channel (the two vanes and their hub) are mobile, and driven by the tree. The fourth side, part of the pump body, is fixed.
  • the wheel therefore has as many channels as there are blades.
  • the rotation of the moving assembly has the effect of raising the pressure of the fluid.
  • the pump Downstream of the impeller in the direction of the fluid flow, the pump comprises a rectifier.
  • a straightener consists of a set of blades regularly spaced in a space of revolution around the axis of the shaft; the blades are located on a hub, or 'bulb'.
  • Two successive blades of a rectifier and the portion of the hub located between these two blades, as well as the portion of the outer casing located between these two blades, constitute a channel. All of these are fixed.
  • the rectifier has as many channels as there are blades.
  • this set of parts namely the pump body, impeller, shaft, and rectifier are metallic and heavy.
  • the shaft carries at its opposite end a cake which allows it to be connected to the motor, the latter carrying a counter-cake perfectly opposite (male female assembly) to the cake carried by the shaft.
  • connection between the shaft and the cake is in all points similar to the connection between the shaft and the wheel.
  • each shaft very generally end in a thread allowing a nut to exert a tightening pressure between the male cones of the shaft, and the female cones of the wheel or of the cake: these nuts prevent the female cones from separating from the male cones.
  • the wheels are:
  • the communication of energy by the pump to the fluid takes place by moving each fluid particle away from the axis of revolution of the pump. This distance is produced by the combined effect of the hub and the blades, limited on the outside by the shape of the cage in which the wheel rotates.
  • the wheels have a truncated cone on which the blades are located; they comprise a second, cylindrical hub, with a diameter of the order of one to two times the diameter of the drive shaft, in which the cone, or the cylinder, intended to receive the shaft of the drive shaft is machined. 'coaching.
  • the frustoconical hub, the vanes located on the frustoconical hub and the cylindrical hub for coupling to the shaft are produced in a single casting.
  • the cylindrical hub transmits the torque from the motor to the frustoconical hub; the frustoconical hub transmits its rotational movements to the blades.
  • the blades transmit to the frustoconical hub the hydrodynamic forces created on the blades, which frustoconical hub transmits a torque and a thrust to the cylindrical hub which transmits this torque and this thrust to the shaft.
  • the frustoconical hub of the impeller Downstream of the impeller in the direction of flow, the frustoconical hub of the impeller is extended by the bulb of the rectifier, the hub on which the fixed vanes of the rectifier are located.
  • the shapes of the outer casing and of the bulb are combined so that the fluid leaving the wheel is very gradually accelerated until it leaves the rectifier.
  • the outer casing, the vanes and the bulb are made in a single piece of foundry.
  • the present invention aims to remedy these drawbacks with a completely innovative approach.
  • the present invention relates to a system for driving a pump wheel, remarkable in that it comprises a wheel, a drive motor and a shaft, the shaft is formed of a hollow cylindrical tube. , of circular section and comprises two ends, one of the two ends comprises a flare in the form of a trumpet bell, the other remaining cylindrical to be connected to the drive motor, said wheel has a surface suitable for being implanted on said flaring integrally, the wheel comprising a hub the shape of which corresponds to the shape of the trumpet flag of the shaft.
  • shafts are very generally solid, whereas the forces to which they are subjected, torsion and buckling, do not require any material in the vicinity of their axis.
  • the shaft is therefore very advantageously hollow.
  • a pump shaft when it transmits torsional forces, does not need any material in the immediate vicinity of its axis of rotation.
  • a pump shaft when it transmits thrust forces, does not need any material in the immediate vicinity of its axis of rotation to cope with buckling, instability linked to its length and to the inertia of its cross section in bending.
  • the invention is based on the fact that wheel and shaft are definitively assembled (integral) and can no longer be uncoupled, which constitutes a new approach without being a drawback.
  • the invention is advantageously implemented according to the embodiments and the variants set out below, which are to be considered individually or according to any technically operative combination.
  • the end of the shaft connected to the drive motor is plugged.
  • the shaft is made of a composite material.
  • a composite material is referred to here as any material comprising an assembly of at least two immiscible components (but having a high penetration capacity), the properties of which complement each other.
  • the shaft is made of a thermoplastic material.
  • Thermoplastic material is referred to here as any material comprising a certain percentage of thermoplastic material constituting a matrix, whether it is a material consisting only of thermoplastic material or for example of a composite material such as those with continuous fibers and with a matrix. thermoplastic.
  • the wheel is made of a composite material.
  • the weight is 2.9 kg while for the same dimensions for a shaft and a metal wheel, the weight is close to 30 kg. Changing the material leads to a weight saving close to 10 times the metal version.
  • Hollow metal shafts are already well known, but their machining cannot be considered physically and is only financially accessible for shafts of at least 100 mm in diameter.
  • the wheel comprises a hub, the shape of which corresponds to the shape of the trumpet horn of the shaft, the assembly of the wheel on the shaft is effected by gluing at the level of the contact surface of the shaft. Flaring shaft and trumpet pavilion shape of the wheel hub.
  • the assembly by gluing the wheel on the shape of the trumpet horn of the shaft allows the elimination of the frustoconical hub of the wheel, that is to say a new elimination of material.
  • the shaft and the wheel each have at least one through hole facing each other and filled with glue.
  • the end opposite the flaring of the shaft is connected to a drive shaft by clamping, said clamping being adapted to drive the shaft in rotation.
  • the shaft has through holes adapted to allow a fluid to pass.
  • the hollow shaft makes it possible to circulate a fluid, for purposes of refrigeration, or of lubrication, because the flare, open at its rear end, is subjected to the high pressure produced by the rotation of the wheel, and the tree skin (outer surface), opened by holes drilled in its front part is subjected to the low pressure which prevails in the fluid inlet.
  • the wheel comprises blades interconnected by an outer casing called a belt.
  • the figure 1 shows the assembly of a wheel 21 and a shaft 20.
  • the shaft 20 is hollow and is formed of a tube of circular cylindrical shape.
  • the hollow shaft 20 has two ends, one of which has a flare in the form of a trumpet bell.
  • the wheel 21 is fixedly installed on the flare.
  • the trumpet horn made of fiber of composite materials, receives by gluing the wheel 21 which is made of a composite material.
  • the wheel 21 is made of another material.
  • the contact surface of the wheel 21 with the flaring of the shaft 20 in the form of a trumpet bell is perfectly compatible with the latter.
  • Shaft 20 is driven by tightening its smooth end (side opposite to the flaring), the end connected to a motor shaft, not shown.
  • the figure 2 shows a front view in which is visible in dotted lines the hollow shape of the shaft 20.
  • the shaft is hollow from one end to the other.
  • the opening of the hollow goes from one end to the other.
  • the thickness of the skin of the shaft is constant from one end to the other of the circular cylindrical part of the shaft 20.
  • the thickness of the shaft of the trumpet-shaped part is reduced to as one approaches the largest diameter of the trumpet horn.
  • the figure 3 shows a perspective view of the hollow shaft 20 of the figure 2 .
  • the figures 4 and 5 show the frustoconical hub of a wheel 21 having a belt as in figure 1 .
  • a closed-type wheel 21 carries an outer casing called a belt, connecting the ends of the blades to each other.
  • a wheel 21 therefore consists of as many channels closed on four sides as there are blades.
  • the tightness of a wheel 21 of the open type between the lower surface 22 and the upper surface 23 of the blades is obtained by a perfect fit between each blade and the outer casing, throughout the rotation of the wheel 21: this gap between the intrados 22 and extrados 23 causes a flow of leakage throughout the quasi contact.
  • the leakage length is proportional to the number of blades of the wheel 21 and to the length of the quasi contact between the blade and the casing.
  • a wheel 21 of the closed type being completely sealed between the lower surface 22 and the upper surface 23, the sealing between the high pressure at the outlet of the wheel 21 and the low pressure at the inlet of the wheel 21 is effected by the gap between the part front of the belt and the outer casing in which the wheel turns 21.
  • the trailing length is equal to the circumference of the belt.
  • a wheel 21 of the closed type has a higher mass inertia than a wheel 21 of the open type, due to the belt, which causes a lowering of the natural frequencies of rotation and bending of the shaft 20.
  • the front part of the belt which seals between the high pressure prevailing between the belt and the inside of the pump body, and the low pressure prevailing upstream of the wheel 21 has a cylindrical shape, the outside diameter of which is very close to the internal diameter of a cylindrical zone belonging to the body of the pump.
  • the cylindrical shape of the front part of the belt which prevails over a width of the order of 5% to 25% of the diameter of this cylinder, is called belt tread.
  • the cylindrical shape of the pump body not visible, facing the tread of the belt, and which has the same width, is called the tread of the pump body.
  • the hub of the wheel 21 has a shape of the frustoconical type perfectly matched with the shape of the trumpet mentioned above and allows the wheel 21 to be fixed on the trumpet.
  • the production of the wheel 21 is carried out in composite materials (instead of foundry of metallic materials), leading to considerable weight reduction, of the order of 8 to 10 times; their execution in composite materials on molds offers a great similarity of the channels to each other, by an identical geometry for each, essentially avoiding balancing operations.
  • a mobile unit must be held at its two ends in the two transverse directions and at any point in its third direction, that is to say along the axis of rotation of the unit.
  • the maintenance in the third direction that is to say the prohibition of any translation of the moving assembly along its own axis, in one direction or the other, is provided by a stop integrated into the conventional ball bearing .
  • the maintenance in the third direction that is to say the prohibition of any translation of the moving assembly along its own axis, in one direction or the other, is provided by a stop positioned at one end of the 'tree 20.
  • the figures 6 and 7 show an open type impeller 21 having blades.
  • the figures 8 and 9 show in cross section the belt tread of the wheel 21 and the tread of the pump housing 24.
  • the figure 8 shows in static, when the wheel 21 is not turning.
  • the figure 9 shows dynamically when the wheel 21 turns.
  • the arrow indicates the direction of rotation.
  • the fluid level is 4 to 10x10 -4 m, i.e. between 1 and 2/1000 th of the inlet diameter of wheel 21.
  • radial clearance is used to denote the difference between the radius of the tread of the pump body and the radius of the tread of the wheel 21.
  • the figure 10 shows in section the shaft 20 terminated by its trumpet, a wheel 21 with a belt and the body of the pump 24.
  • the figure 11 shows shaft 20 and through holes.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Ocean & Marine Engineering (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Valves And Accessory Devices For Braking Systems (AREA)

Description

Domaine technique de l'inventionTechnical field of the invention

La présente invention concerne un système d'entrainement d'une roue de pompe.The present invention relates to a system for driving a pump wheel.

Une pompe est constituée d'un équipage mobile, c'est-à-dire une roue ou hélice, assujettie à un arbre qui entraine la roue ; l'équipage mobile tourne dans le corps de la pompe qui constitue un espace de révolution autour de l'axe de l'arbre.A pump consists of a mobile unit, that is to say a wheel or propeller, attached to a shaft which drives the wheel; the mobile assembly rotates in the body of the pump which constitutes a space of revolution around the axis of the shaft.

Le fluide passe par le petit diamètre de la roue et sort par le grand diamètre ; à sa sortie de la roue, le fluide est délivré à une pression plus élevée qu'à son entrée.The fluid passes through the small diameter of the impeller and exits through the large diameter; at its exit from the wheel, the fluid is delivered at a higher pressure than at its inlet.

La roue est constituée d'un ensemble d'aubes, régulièrement implantées sur une forme de type tronconique appelée moyeu.The wheel consists of a set of blades, regularly located on a frustoconical type shape called a hub.

Deux aubes successives d'une roue et la portion du moyeu située entre ces deux aubes, ainsi que la portion du corps de la pompe située entre ces deux aubes, constituent un canal : trois côtés de ce canal (les deux aubes et leur moyeu) sont mobiles, et entrainés par l'arbre. Le quatrième côté, partie du corps de la pompe, est fixe.Two successive vanes of a wheel and the portion of the hub located between these two vanes, as well as the portion of the pump body located between these two vanes, constitute a channel: three sides of this channel (the two vanes and their hub) are mobile, and driven by the tree. The fourth side, part of the pump body, is fixed.

La roue comporte donc autant de canaux que d'aubes.The wheel therefore has as many channels as there are blades.

La rotation de l'équipage mobile a pour effet d'élever la pression du fluide.The rotation of the moving assembly has the effect of raising the pressure of the fluid.

En aval de la roue dans le sens de l'écoulement du fluide, la pompe comporte un redresseur.Downstream of the impeller in the direction of the fluid flow, the pump comprises a rectifier.

Un redresseur est constitué d'un ensemble d'aubes régulièrement espacées dans un espace de révolution autour de l'axe de l'arbre ; les aubes sont implantées sur un moyeu, ou 'bulbe'.A straightener consists of a set of blades regularly spaced in a space of revolution around the axis of the shaft; the blades are located on a hub, or 'bulb'.

Deux aubes successives d'un redresseur et la portion du moyeu située entre ces deux aubes, ainsi que la portion de l'enveloppe extérieure située entre ces deux aubes, constituent un canal. Tous ces éléments sont fixes.Two successive blades of a rectifier and the portion of the hub located between these two blades, as well as the portion of the outer casing located between these two blades, constitute a channel. All of these are fixed.

Le redresseur comporte autant de canaux que d'aubes.The rectifier has as many channels as there are blades.

A sa sortie du redresseur, le fluide, qui a été 'vissé' au cours de son parcours dans la roue, est 'dévissé' lors de son parcours dans le redresseur, de sorte qu'il soit finalement 'tranquille', c'est-à-dire dans un état peu perturbé (homogénéité du vecteur vitesse dans une section transversale).On leaving the rectifier, the fluid, which has been 'screwed in' during its journey through the wheel, is 'unscrewed' as it travels through the rectifier, so that it is finally 'quiet', that is to say in a little disturbed state (homogeneity of the speed vector in a cross section).

Technique antérieurePrior art

Traditionnellement, cet ensemble de pièces, à savoir le corps de la pompe, la roue, l'arbre, et le redresseur sont métalliques et lourds.Traditionally, this set of parts, namely the pump body, impeller, shaft, and rectifier are metallic and heavy.

Les arbres :Trees :

Les deux extrémités de chaque arbre sont usinées :

  • soit de façon tronconique mâle, l'entrainement en rotation s'effectuant à l'aide d'une clavette placée le long d'une génératrice du cône,
  • soit de façon cylindrique, l'entrainement en rotation s'effectuant à l'aide de rainures (ou cannelures) sur toute la circonférence de l'arbre,
  • soit de façon cylindrique également, mais l'arbre étant usiné parfaitement lisse, l'entrainement en rotation s'effectuant par serrage du moyeu sur l'arbre.
Both ends of each shaft are machined:
  • either in a male frustoconical manner, the rotation training being carried out using a key placed along a generatrix of the cone,
  • either in a cylindrical manner, the rotational drive being carried out using grooves (or splines) around the entire circumference of the shaft,
  • or also cylindrically, but the shaft being machined perfectly smooth, the rotational drive being effected by clamping the hub on the shaft.

Pour pouvoir être entrainée, la roue doit être usinée, le cas échéant,

  • soit de façon tronconique femelle, à l'opposé de l'arbre (assemblage mâle femelle) et posséder également une rainure de clavetage parfaitement appairée à celle de l'arbre,
  • soit de façon cylindrique et présenter des rainures parfaitement appairées à celles de l'arbre,
  • soit de façon cylindrique et parfaitement lisse, et présenter une forme appropriée du moyeu permettant de le serrer sur l'arbre.
To be able to be driven, the wheel must be machined, if necessary,
  • either in a female frustoconical manner, opposite the shaft (male female assembly) and also have a keyway perfectly matched to that of the shaft,
  • either cylindrical and have grooves perfectly matched to those of the shaft,
  • either cylindrically and perfectly smooth, and have an appropriate shape of the hub allowing it to be clamped on the shaft.

Pour pouvoir être entrainé, l'arbre porte à son extrémité opposée un tourteau qui permet de le raccorder au moteur, ce dernier portant un contre-tourteau parfaitement opposé (assemblage mâle femelle) au tourteau porté par l'arbre.In order to be able to be driven, the shaft carries at its opposite end a cake which allows it to be connected to the motor, the latter carrying a counter-cake perfectly opposite (male female assembly) to the cake carried by the shaft.

La liaison entre l'arbre et le tourteau est en tous points similaire à la liaison entre l'arbre et la roue.The connection between the shaft and the cake is in all points similar to the connection between the shaft and the wheel.

Les deux extrémités de chaque arbre se terminent très généralement par un filetage permettant à un écrou d'exercer une pression de serrage entre les cônes mâles de l'arbre, et les cônes femelles de la roue ou du tourteau : ces écrous empêchent les cônes femelles de se désolidariser des cônes mâles.The two ends of each shaft very generally end in a thread allowing a nut to exert a tightening pressure between the male cones of the shaft, and the female cones of the wheel or of the cake: these nuts prevent the female cones from separating from the male cones.

Les roues :The wheels :

La communication d'énergie par la pompe au fluide se fait par un éloignement de chaque particule fluide de l'axe de révolution de la pompe. Cet éloignement est produit par effet combiné du moyeu et des aubes, limité à l'extérieur par la forme de la cage dans laquelle tourne la roue.The communication of energy by the pump to the fluid takes place by moving each fluid particle away from the axis of revolution of the pump. This distance is produced by the combined effect of the hub and the blades, limited on the outside by the shape of the cage in which the wheel rotates.

Les roues possèdent un tronc de cône sur lequel sont implantées les aubes ; elles comportent un second moyeu, cylindrique, d'un diamètre de l'ordre d'une à deux fois le diamètre de l'arbre d'entrainement, dans lequel est usiné le cône, ou le cylindre, destiné à recevoir l'arbre d'entrainement.The wheels have a truncated cone on which the blades are located; they comprise a second, cylindrical hub, with a diameter of the order of one to two times the diameter of the drive shaft, in which the cone, or the cylinder, intended to receive the shaft of the drive shaft is machined. 'coaching.

Traditionnellement, le moyeu tronconique, les aubes implantées sur le moyeu tronconique et le moyeu cylindrique d'accouplement à l'arbre sont réalisés en une seule pièce de fonderie.Traditionally, the frustoconical hub, the vanes located on the frustoconical hub and the cylindrical hub for coupling to the shaft are produced in a single casting.

Le moyeu cylindrique transmet le couple du moteur au moyeu tronconique ; le moyeu tronconique transmet ses mouvements de rotation aux aubes.The cylindrical hub transmits the torque from the motor to the frustoconical hub; the frustoconical hub transmits its rotational movements to the blades.

Réciproquement les aubes transmettent au moyeu tronconique les efforts hydrodynamiques créés sur les aubes, lequel moyeu tronconique transmet un couple et une poussée au moyeu cylindrique lequel transmet ce couple et cette poussée à l'arbre.Reciprocally, the blades transmit to the frustoconical hub the hydrodynamic forces created on the blades, which frustoconical hub transmits a torque and a thrust to the cylindrical hub which transmits this torque and this thrust to the shaft.

Les redresseurs :Rectifiers:

En aval de la roue dans le sens de l'écoulement, le moyeu tronconique de la roue est prolongé par le bulbe du redresseur, moyeu sur lequel sont implantées les aubes fixes du redresseur.Downstream of the impeller in the direction of flow, the frustoconical hub of the impeller is extended by the bulb of the rectifier, the hub on which the fixed vanes of the rectifier are located.

Les formes de l'enveloppe extérieure et du bulbe sont conjuguées de sorte que le fluide sortant de la roue soit très progressivement accéléré jusqu'à sa sortie du redresseur.The shapes of the outer casing and of the bulb are combined so that the fluid leaving the wheel is very gradually accelerated until it leaves the rectifier.

Traditionnellement, l'enveloppe extérieure, les aubes et le bulbe sont réalisés en une seule pièce de fonderie.Traditionally, the outer casing, the vanes and the bulb are made in a single piece of foundry.

Toutes ces pièces sont sujettes à dégradation dans le temps, par exposition à la corrosion, et à l'usure, par exposition aux vitesses d'écoulement du fluide. Le document DE 387 791 C divulgue aux figures 3 et 4 une pompe selon le préambule de la revendication 1.All of these parts are subject to degradation over time, by exposure to corrosion, and wear, by exposure to fluid flow velocities. The document DE 387 791 C discloses to figures 3 and 4 a pump according to the preamble of claim 1.

Présentation de l'inventionPresentation of the invention

La présente invention vise à remédier à ces inconvénients avec une approche totalement novatrice.The present invention aims to remedy these drawbacks with a completely innovative approach.

A cet effet, la présente invention vise un système d'entrainement d'une roue de pompe, remarquable en ce qu'il comporte une roue, un moteur d'entrainement et un arbre, l'arbre est formé d'un tube cylindrique creux, de section circulaire et comprend deux extrémités, l'une des deux extrémités comporte un évasement en forme de pavillon de trompette, l'autre restant cylindrique pour être reliée au moteur d'entrainement, ladite roue comporte une surface adaptée pour être implantée sur ledit évasement de manière solidaire, la roue comportant un moyeu dont la forme correspond à la forme de pavillon de trompette de l'arbre.To this end, the present invention relates to a system for driving a pump wheel, remarkable in that it comprises a wheel, a drive motor and a shaft, the shaft is formed of a hollow cylindrical tube. , of circular section and comprises two ends, one of the two ends comprises a flare in the form of a trumpet bell, the other remaining cylindrical to be connected to the drive motor, said wheel has a surface suitable for being implanted on said flaring integrally, the wheel comprising a hub the shape of which corresponds to the shape of the trumpet flag of the shaft.

Classiquement les arbres sont très généralement pleins, alors que les efforts auxquels ils sont soumis, torsion et flambement, ne nécessitent aucune matière au voisinage de leur axe. Dans la présente invention, l'arbre est donc très avantageusement creux.Conventionally, shafts are very generally solid, whereas the forces to which they are subjected, torsion and buckling, do not require any material in the vicinity of their axis. In the present invention, the shaft is therefore very advantageously hollow.

L'exécution d'un arbre creux permet d'enlever la matière là où elle n'est d'aucune utilité, sans perte de résistance.The execution of a hollow shaft allows material to be removed where it is of no use, without loss of strength.

Un arbre de pompe, lorsqu'il transmet des efforts de torsion, n'a nul besoin de matière au voisinage immédiat de son axe de rotation.A pump shaft, when it transmits torsional forces, does not need any material in the immediate vicinity of its axis of rotation.

Un arbre de pompe, lorsqu'il transmet des efforts de poussée, n'a nul besoin de matière au voisinage immédiat de son axe de rotation pour faire face au flambement, instabilité liée à sa longueur et à l'inertie de sa section droite en flexion.A pump shaft, when it transmits thrust forces, does not need any material in the immediate vicinity of its axis of rotation to cope with buckling, instability linked to its length and to the inertia of its cross section in bending.

La matière mise en œuvre est désormais partout utile.The material used is now useful everywhere.

L'invention repose sur le fait que roue et arbre sont définitivement assemblés (solidaires) et ne peuvent plus être désaccouplés, ce qui constitue une nouvelle approche sans être un inconvénient.The invention is based on the fact that wheel and shaft are definitively assembled (integral) and can no longer be uncoupled, which constitutes a new approach without being a drawback.

L'invention est avantageusement mise en œuvre selon les modes de réalisation et les variantes exposées ci-après, lesquelles sont à considérer individuellement ou selon toute combinaison techniquement opérante.The invention is advantageously implemented according to the embodiments and the variants set out below, which are to be considered individually or according to any technically operative combination.

Dans un mode de réalisation, l'extrémité de l'arbre reliée au moteur d'entrainement est bouchée.In one embodiment, the end of the shaft connected to the drive motor is plugged.

Dans un mode de réalisation, l'arbre est constitué en matériau composite.In one embodiment, the shaft is made of a composite material.

De manière très générale, on appelle ici matériau composite tout matériau comportant un assemblage d'au moins deux composants non miscibles (mais ayant une forte capacité de pénétration) dont les propriétés se complètent.Very generally, a composite material is referred to here as any material comprising an assembly of at least two immiscible components (but having a high penetration capacity), the properties of which complement each other.

Dans une variante, l'arbre est constitué en matériau thermoplastique.In one variant, the shaft is made of a thermoplastic material.

On appelle ici matériau thermoplastique tout matériau comportant un certain pourcentage de matériau thermoplastique constituant une matrice, qu'il s'agisse d'un matériau constitué seulement de matériau thermoplastique ou encore par exemple d'un matériau composite comme ceux à fibres continues et à matrice thermoplastique.Thermoplastic material is referred to here as any material comprising a certain percentage of thermoplastic material constituting a matrix, whether it is a material consisting only of thermoplastic material or for example of a composite material such as those with continuous fibers and with a matrix. thermoplastic.

Dans un mode de réalisation, la roue est constituée en matériau composite.In one embodiment, the wheel is made of a composite material.

L'assemblage de l'arbre et la roue conduisent à des allègements considérables ; une augmentation de la durée de vie est également attendue par l'utilisation de composites, notamment parce que la résistance des matériaux thermoplastiques (composites) à la cavitation est généralement meilleure que celle des matériaux métalliques.The assembly of the shaft and the wheel lead to considerable weight reduction; an increase in the service life is also expected by the use of composites, in particular because the resistance of thermoplastic materials (composites) to cavitation is generally better than that of metallic materials.

Grâce à ces dispositions, la réalisation d'un arbre creux est aisée et courante en matériaux composites.Thanks to these arrangements, the production of a hollow shaft is easy and common in composite materials.

La réalisation de l'arbre en matériaux composites au lieu de matériaux métalliques permet un net gain de poids.The realization of the shaft in composite materials instead of metallic materials allows a net gain in weight.

Dans un exemple de réalisation, pour un ensemble composé d'un arbre et d'une roue en carbone, le poids est de 2,9kg alors que pour les mêmes dimensions pour un arbre et une roue métallique, le poids est proche des 30kg. Le fait de changer de matériau conduit à un gain en poids proche de 10 fois la version métallique.In an exemplary embodiment, for an assembly made up of a shaft and a carbon wheel, the weight is 2.9 kg while for the same dimensions for a shaft and a metal wheel, the weight is close to 30 kg. Changing the material leads to a weight saving close to 10 times the metal version.

En outre l'utilisation de matériaux composites conduit à un accroissement considérable de la raideur de l'arbre.In addition, the use of composite materials leads to a considerable increase in the stiffness of the shaft.

Les arbres métalliques creux sont déjà bien connus, mais leur usinage ne peut s'envisager physiquement et n'est accessible financièrement que pour des arbres d'au moins 100 mm de diamètre.Hollow metal shafts are already well known, but their machining cannot be considered physically and is only financially accessible for shafts of at least 100 mm in diameter.

Tout au contraire, la fabrication d'arbres en matériaux composites, se faisant par enroulement autour d'un mandrin, élimine par principe la matière située au voisinage de son axe, donc de l'axe de rotation de l'ensemble.On the contrary, the manufacture of shafts in composite materials, being carried out by winding around a mandrel, in principle eliminates the material situated in the vicinity of its axis, and therefore of the axis of rotation of the assembly.

Par suite la forme physique de l'arbre d'une part, et celle de la roue d'autre part, obtenues sans qu'il y ait de matière autour de l'axe de rotation, conduit à une réduction de la masse de matière mise en œuvre, sans réduction de la résistance des deux pièces.As a result, the physical shape of the shaft on the one hand, and that of the wheel on the other hand, obtained without there being any material around the axis of rotation, leads to a reduction in the mass of material implementation, without reducing the resistance of the two parts.

Dans un mode de réalisation, la roue comporte un moyeu dont la forme correspond à la forme de pavillon de trompette de l'arbre, l'assemblage de la roue sur l'arbre est réalisé par collage au niveau de la surface de contact de l'évasement de l'arbre et de la forme de pavillon de trompette du moyeu de la roue.In one embodiment, the wheel comprises a hub, the shape of which corresponds to the shape of the trumpet horn of the shaft, the assembly of the wheel on the shaft is effected by gluing at the level of the contact surface of the shaft. Flaring shaft and trumpet pavilion shape of the wheel hub.

L'assemblage par collage de la roue sur la forme de pavillon de trompette de l'arbre permet la suppression du moyeu tronconique de la roue, c'est-à-dire une nouvelle suppression de matière.The assembly by gluing the wheel on the shape of the trumpet horn of the shaft allows the elimination of the frustoconical hub of the wheel, that is to say a new elimination of material.

En outre l'assemblage direct de la roue sur la trompette ne conduit à aucune masse supplémentaire, autre qu'un film de colle.In addition, the direct assembly of the wheel on the trumpet does not lead to any additional mass, other than a film of glue.

Dans un mode de réalisation, au niveau de la surface de contact entre le pavillon de trompette de l'arbre et la roue, l'arbre et la roue comportent chacun au moins un trou traversant en vis-à-vis et rempli de colle.In one embodiment, at the level of the contact surface between the trumpet horn of the shaft and the wheel, the shaft and the wheel each have at least one through hole facing each other and filled with glue.

Ainsi les trous traversants résistent aux efforts de cisaillement provoqués par la rotation.Thus the through holes resist the shear forces caused by the rotation.

Dans un mode de réalisation, l'extrémité opposée à l'évasement de l'arbre est reliée à un arbre moteur par serrage, ledit serrage étant adapté à entrainer l'arbre en rotation.In one embodiment, the end opposite the flaring of the shaft is connected to a drive shaft by clamping, said clamping being adapted to drive the shaft in rotation.

Dans un mode de réalisation, l'arbre comporte des trous traversants adaptés à laisser passer un fluide.In one embodiment, the shaft has through holes adapted to allow a fluid to pass.

En outre l'arbre creux permet de faire circuler un fluide, à des fins de réfrigération, ou de lubrification, car l'évasement, ouvert à son extrémité arrière, est soumis à la haute pression produite par la rotation de la roue, et la peau de l'arbre (surface externe), ouverte par des trous percés dans sa partie avant, est soumise à la basse pression qui règne dans l'entrée du fluide.In addition, the hollow shaft makes it possible to circulate a fluid, for purposes of refrigeration, or of lubrication, because the flare, open at its rear end, is subjected to the high pressure produced by the rotation of the wheel, and the tree skin (outer surface), opened by holes drilled in its front part is subjected to the low pressure which prevails in the fluid inlet.

Dans un mode de réalisation, la roue comporte des aubes reliées entre elles par une enveloppe extérieure appelée ceinture.In one embodiment, the wheel comprises blades interconnected by an outer casing called a belt.

Globalement toutes les réductions de poids confondues conduisent à diviser le poids de l'arbre par 10, par rapport aux matériaux actuels.Overall, all the weight reductions combined lead to dividing the weight of the shaft by 10, compared to current materials.

Brève description des figuresBrief description of the figures

D'autres avantages, buts et caractéristiques de la présente invention ressortent de la description qui suit faite, dans un but explicatif et nullement limitatif, en regard des dessins annexés, dans lesquels :

  • [Fig. 1] la figure 1 représente une vue en perspective composée d'un arbre et d'une roue, objet de la présente invention ;
  • [Fig. 2] la figure 2 représente une vue de face de l'arbre objet de la présente invention ;
  • [Fig. 3] la figure 3 représente une vue de perspective de l'arbre objet de la présente invention ;
  • [Fig. 4] la figure 4 représente une vue de perspective selon un côté d'une roue objet de la présente invention ;
  • [Fig. 5] la figure 5 représente une vue de perspective selon un autre côté de la roue de la figure précédente montrant le moyeu tronconique ;
  • [Fig. 6] la figure 6 représente une vue de perspective selon un côté d'une autre roue objet de la présente invention ;
  • [Fig. 7] la figure 7 représente une vue de perspective selon un autre côté de la roue de la figure précédente ;
  • [Fig. 8] la figure 8 représente une vue en coupe transversale de la ceinture et le corps de la pompe en statique ;
  • [Fig. 9] la figure 9 représente une vue en coupe transversale de la ceinture et le corps de la pompe en dynamique ;
  • [Fig. 10] la figure 10 représente une vue en coupe l'arbre, une roue avec une ceinture et le corps de la pompe ;
  • [Fig. 11] la figure 11 représente l'arbre avec des trous traversants.
Other advantages, aims and characteristics of the present invention emerge from the following description given, for explanatory and in no way limiting, with reference to the accompanying drawings, in which:
  • [ Fig. 1 ] the figure 1 represents a perspective view composed of a shaft and a wheel, object of the present invention;
  • [ Fig. 2 ] the figure 2 represents a front view of the tree which is the subject of the present invention;
  • [ Fig. 3 ] the figure 3 represents a perspective view of the tree which is the subject of the present invention;
  • [ Fig. 4 ] the figure 4 shows a perspective view along one side of a wheel object of the present invention;
  • [ Fig. 5 ] the figure 5 represents a perspective view along another side of the wheel of the previous figure showing the frustoconical hub;
  • [ Fig. 6 ] the figure 6 shows a perspective view along one side of another wheel which is the subject of the present invention;
  • [ Fig. 7 ] the figure 7 shows a perspective view along another side of the wheel of the previous figure;
  • [ Fig. 8 ] the figure 8 shows a cross-sectional view of the belt and the body of the pump in static;
  • [ Fig. 9 ] the figure 9 shows a cross-sectional view of the belt and the pump body in dynamics;
  • [ Fig. 10 ] the figure 10 shows a sectional view of the shaft, an impeller with a belt and the pump body;
  • [ Fig. 11 ] the figure 11 represents the tree with through holes.

Description des modes de réalisationDescription of the embodiments

La figure 1 montre l'assemblage d'une roue 21 et d'un arbre 20. L'arbre 20 est creux et est formé d'un tube de forme cylindrique circulaire. L'arbre 20 creux comporte deux extrémités dont l'une comporte un évasement en forme de pavillon de trompette. La roue 21 est implantée sur l'évasement de manière solidaire.The figure 1 shows the assembly of a wheel 21 and a shaft 20. The shaft 20 is hollow and is formed of a tube of circular cylindrical shape. The hollow shaft 20 has two ends, one of which has a flare in the form of a trumpet bell. The wheel 21 is fixedly installed on the flare.

Le pavillon de trompette, réalisé en fibre de matériaux composites, reçoit par collage la roue 21 qui est constituée d'un matériau composite. Selon un autre exemple de réalisation, la roue 21 est constituée d'un autre matériau. La surface de contact de la roue 21 avec l'évasement de l'arbre 20 en forme de pavillon de trompette est parfaitement compatible avec ce dernier.The trumpet horn, made of fiber of composite materials, receives by gluing the wheel 21 which is made of a composite material. According to another exemplary embodiment, the wheel 21 is made of another material. The contact surface of the wheel 21 with the flaring of the shaft 20 in the form of a trumpet bell is perfectly compatible with the latter.

L'entrainement de l'arbre 20 est réalisé par serrage de son extrémité lisse (côté opposé à l'évasement), extrémité reliée à un arbre moteur non représenté.Shaft 20 is driven by tightening its smooth end (side opposite to the flaring), the end connected to a motor shaft, not shown.

La figure 2 montre une vue de face sur laquelle est visible en pointillé la forme creuse de l'arbre 20. L'arbre est creux d'une extrémité à l'autre . L'ouverture du creux part d'une extrémité à l'autre. L'épaisseur de la peau de l'arbre est constante d'une extrémité à l'autre de la partie cylindrique circulaire de l'arbre 20. L'épaisseur de l'arbre de la partie en forme de pavillon de trompette se réduit au fur et à mesure que l'on s'approche du diamètre le plus grand du pavillon de trompette.The figure 2 shows a front view in which is visible in dotted lines the hollow shape of the shaft 20. The shaft is hollow from one end to the other. The opening of the hollow goes from one end to the other. The thickness of the skin of the shaft is constant from one end to the other of the circular cylindrical part of the shaft 20. The thickness of the shaft of the trumpet-shaped part is reduced to as one approaches the largest diameter of the trumpet horn.

La figure 3 montre une vue en perspective de l'arbre 20 creux de la figure 2.The figure 3 shows a perspective view of the hollow shaft 20 of the figure 2 .

Les figures 4 et 5 montrent le moyeu tronconique d'une roue 21 ayant une ceinture comme à la figure 1.The figures 4 and 5 show the frustoconical hub of a wheel 21 having a belt as in figure 1 .

Une roue 21 de type fermé porte une enveloppe extérieure appelée ceinture, liant entre elles les extrémités des aubes. Une roue 21 est donc constituée d'autant de canaux fermés sur quatre côtés, que d'aubes.A closed-type wheel 21 carries an outer casing called a belt, connecting the ends of the blades to each other. A wheel 21 therefore consists of as many channels closed on four sides as there are blades.

L'utilisation de roues 21 de type fermé, malgré une légère baisse du débit, offre des avantages tout particuliers :The use of wheels 21 of the closed type, despite a slight reduction in flow, offers very particular advantages:

- au fil du temps, car le passage du fluide entre la haute pression (intrados 22 de l'aube) et la basse pression (extrados 23 de l'aube) d'une roue 21 de type ouvert, engendre une usure d'autant plus rapide du bord de l'aube au contact de l'enveloppe extérieure que l'interstice entre l'aube et l'enveloppe est petit, alors que dans le cas d'une roue 21 de type fermé, cet interstice n'existe pas. Cette usure des roues 21 de type ouvert entraine une chute du débit, et donc une dégradation dans le temps de la poussée de l'hydrojet,- over time, because the passage of the fluid between the high pressure (lower surface 22 of the blade) and the low pressure (upper surface 23 of the blade) of a wheel 21 of the open type, causes wear of as much faster from the edge of the vane in contact with the outer casing that the interstice between the vane and the casing is small, whereas in the case of a wheel 21 of the closed type, this interstice does not exist. This wear of the open type wheels 21 causes a drop in the flow rate, and therefore a degradation over time of the thrust of the hydrojet,

- en matière de résistance, car les aubes des roues 21 de type ouvert sont encastrées uniquement sur le moyeu, alors que les aubes des roues 21 fermées sont encastrées sur le moyeu et sur la ceinture.- In terms of resistance, because the blades of the open type wheels 21 are embedded only on the hub, while the blades of the closed wheels 21 are embedded on the hub and on the belt.

L'étanchéité d'une roue 21 de type ouvert entre l'intrados 22 et l'extrados 23 des aubes s'obtient par un parfait ajustage entre chaque aube et l'enveloppe extérieure, tout au long de la rotation de la roue 21 : cet interstice entre intrados 22 et extrados 23 cause un débit de fuite tout au long du quasi contact. La longueur de fuite est proportionnelle au nombre d'aubes de la roue 21 et à la longueur du quasi contact entre aube et enveloppe.The tightness of a wheel 21 of the open type between the lower surface 22 and the upper surface 23 of the blades is obtained by a perfect fit between each blade and the outer casing, throughout the rotation of the wheel 21: this gap between the intrados 22 and extrados 23 causes a flow of leakage throughout the quasi contact. The leakage length is proportional to the number of blades of the wheel 21 and to the length of the quasi contact between the blade and the casing.

Une roue 21 de type fermé étant totalement étanche entre intrados 22 et extrados 23, l'étanchéité entre la haute pression en sortie de roue 21 et la basse pression à l'entrée de la roue 21 s'effectue par l'interstice entre la partie avant de la ceinture et l'enveloppe extérieure dans laquelle tourne la roue 21. La longueur de fuite est égale à la circonférence de la ceinture.A wheel 21 of the closed type being completely sealed between the lower surface 22 and the upper surface 23, the sealing between the high pressure at the outlet of the wheel 21 and the low pressure at the inlet of the wheel 21 is effected by the gap between the part front of the belt and the outer casing in which the wheel turns 21. The trailing length is equal to the circumference of the belt.

Une roue 21 de type fermé a une inertie de masse plus élevée qu'une roue 21 de type ouvert, du fait de la ceinture, laquelle cause un abaissement des fréquences propres de rotation et de flexion de l'arbre 20.A wheel 21 of the closed type has a higher mass inertia than a wheel 21 of the open type, due to the belt, which causes a lowering of the natural frequencies of rotation and bending of the shaft 20.

Une application de ce système est la propulsion de navire par jet d'eau, ou hydrojet, qui utilise des pompes.One application of this system is water jet, or hydrojet, ship propulsion which uses pumps.

La partie avant de la ceinture, qui assure l'étanchéité entre la haute pression régnant entre la ceinture et l'intérieur du corps de la pompe, et la basse pression régnant en amont de la roue 21 présente une forme cylindrique dont le diamètre extérieur est très proche du diamètre intérieur d'une zone cylindrique appartenant au corps de la pompe.The front part of the belt, which seals between the high pressure prevailing between the belt and the inside of the pump body, and the low pressure prevailing upstream of the wheel 21 has a cylindrical shape, the outside diameter of which is very close to the internal diameter of a cylindrical zone belonging to the body of the pump.

La forme cylindrique de la partie avant de la ceinture, qui règne sur une largeur de l'ordre de 5% à 25% du diamètre de ce cylindre, est appelée bande de roulement de la ceinture. La forme cylindrique du corps de la pompe, non visible, faisant face à la bande de roulement de la ceinture, et qui règne sur une même largeur, est appelée bande de roulement du corps de pompe. Entre les deux bandes de roulement, soumises sur l'arrière à une haute pression, celle régnant en sortie de la roue 21, et sur l'avant à une basse pression, celle régnant en entrée de la roue 21, il s'établit un palier fluide.The cylindrical shape of the front part of the belt, which prevails over a width of the order of 5% to 25% of the diameter of this cylinder, is called belt tread. The cylindrical shape of the pump body, not visible, facing the tread of the belt, and which has the same width, is called the tread of the pump body. Between the two treads, subjected on the rear to a high pressure, that prevailing at the outlet of the wheel 21, and on the front at a low pressure, that prevailing at the inlet of the wheel 21, a fluid bearing.

Le moyeu de la roue 21 présente une forme de type tronconique parfaitement appairée avec la forme de la trompette évoquée ci-avant et permet la fixation de la roue 21 sur la trompette.The hub of the wheel 21 has a shape of the frustoconical type perfectly matched with the shape of the trumpet mentioned above and allows the wheel 21 to be fixed on the trumpet.

La réalisation de la roue 21 est effectuée en matériaux composites (au lieu de fonderie de matériaux métalliques), conduisant à des allègements considérables, de l'ordre de 8 à 10 fois ; leur exécution en matériaux composites sur des moules offre une grande similitude des canaux entre eux, par une géométrie identique pour chacun, évitant pour l'essentiel des opérations d'équilibrage.The production of the wheel 21 is carried out in composite materials (instead of foundry of metallic materials), leading to considerable weight reduction, of the order of 8 to 10 times; their execution in composite materials on molds offers a great similarity of the channels to each other, by an identical geometry for each, essentially avoiding balancing operations.

L'allégement de la roue 21, même de type fermé, réduit considérablement son inertie en rotation.The lightening of the wheel 21, even of the closed type, considerably reduces its inertia in rotation.

Un équipage mobile doit être tenu à ses deux extrémités dans les deux directions transversales et en un point quelconque dans sa troisième direction, c'est-à-dire selon l'axe de rotation de l'équipage.A mobile unit must be held at its two ends in the two transverse directions and at any point in its third direction, that is to say along the axis of rotation of the unit.

Selon un exemple de réalisation, la tenue transversale est assurée aux deux extrémités de l'arbre 20 : elle est réalisée,

  • à l'extrémité avant par un roulement à billes conventionnel, placé dans l'air,
  • et à l'extrémité arrière par le palier fluide qui s'établit entre les deux bandes de roulement, et qui maintient l'arrière de l'équipage mobile dans les deux directions transversales : ce palier constitue très avantageusement l'appui arrière de l'équipage mobile.
According to an exemplary embodiment, the transverse strength is ensured at both ends of the shaft 20: it is achieved,
  • at the front end by a conventional ball bearing, placed in the air,
  • and at the rear end by the fluid bearing which is established between the two treads, and which keeps the rear of the moving assembly in the two transverse directions: this bearing very advantageously constitutes the rear support of the mobile crew.

Le maintien dans la troisième direction, c'est-à-dire l'interdiction de toute translation de l'équipage mobile selon son axe propre, dans un sens comme dans l'autre, est assuré par une butée intégrée au roulement à billes conventionnel.The maintenance in the third direction, that is to say the prohibition of any translation of the moving assembly along its own axis, in one direction or the other, is provided by a stop integrated into the conventional ball bearing .

Selon un autre exemple de réalisation, la tenue transversale est assurée aux deux extrémités de l'arbre 20 : elle est réalisée,

  • à l'extrémité avant par le palier fluide qui s'établit entre l'arbre 20 creux et le corps de la pompe,
  • et à l'extrémité arrière par le palier fluide qui s'établit entre les deux bandes de roulement, et qui maintient l'arrière de l'équipage dans les deux directions transversales : ce palier constitue très avantageusement l'appui arrière de l'équipage mobile.
According to another exemplary embodiment, the transverse strength is ensured at both ends of the shaft 20: it is achieved,
  • at the front end by the fluid bearing which is established between the hollow shaft 20 and the pump body,
  • and at the rear end by the fluid bearing which is established between the two treads, and which maintains the rear of the crew in the two transverse directions: this bearing very advantageously constitutes the rear support of the crew mobile.

Le maintien dans la troisième direction, c'est-à-dire l'interdiction de toute translation de l'équipage mobile selon son axe propre, dans un sens comme dans l'autre, est assuré par une butée positionnée à une extrémité de l'arbre 20.The maintenance in the third direction, that is to say the prohibition of any translation of the moving assembly along its own axis, in one direction or the other, is provided by a stop positioned at one end of the 'tree 20.

Cette réalisation conduit à :

  • un allègement considérable de la roue 21,
  • à une insensibilité à la corrosion et à une très faible sensibilité aux conséquences de la cavitation,
  • à un parfait centrage et à un quasi équilibrage de la roue 21 en rotation,
  • à une réduction des efforts d'entrainement en rotation de la roue 21,
  • à une réduction considérable de l'inertie en rotation de la roue 21.
This achievement leads to:
  • a considerable lightening of the wheel 21,
  • insensitivity to corrosion and very low sensitivity to the consequences of cavitation,
  • perfect centering and quasi-balancing of the rotating wheel 21,
  • to a reduction in the rotational driving forces of the wheel 21,
  • to a considerable reduction in the rotational inertia of the wheel 21.

L'ensemble des dispositions décrites ci-avant conduit à un cumul des avantages individuels obtenus sur l'arbre 20 et sur la roue 21, et en outre à :

  • un équipage mobile très léger, simplifiant les opérations de montage,
  • à une réduction de la longueur de l'arbre 20 portant la roue 21, réduite à la distance entre l'appui avant et le petit diamètre du tronc de cône de la trompette,
  • à une élévation considérable des fréquences propres de vibration de torsion de l'arbre 20 en rotation et de flexion de l'arbre 20, obtenue tant par un accroissement de la raideur de l'arbre 20 et par la réduction de la distance entre appuis, que par la réduction de l'inertie en rotation de la roue 21,
  • à une simplification des opérations d'entretien (élimination de clavette, écrous, filetage, etc....), autorisant un démontage sans effort et navire à flot.
All the arrangements described above lead to an accumulation of the individual advantages obtained on the shaft 20 and on the wheel 21, and in addition to:
  • a very light mobile unit, simplifying assembly operations,
  • to a reduction in the length of the shaft 20 carrying the wheel 21, reduced to the distance between the front support and the small diameter of the truncated cone of the trumpet,
  • to a considerable increase in the natural frequencies of torsional vibration of the rotating shaft 20 and of bending of the shaft 20, obtained both by an increase in the stiffness of the shaft 20 and by the reduction in the distance between supports, that by reducing the rotational inertia of the wheel 21,
  • simplification of maintenance operations (elimination of key, nuts, thread, etc.), allowing effortless dismantling and vessel afloat.

Les figures 6 et 7 montrent une roue 21 de type ouvert ayant des pales.The figures 6 and 7 show an open type impeller 21 having blades.

Dans cet exemple, il n'y a pas de ceinture.In this example, there is no belt.

Les figures 8 et 9 montrent en coupe transversale la bande de roulement de ceinture de la roue 21 et la bande de roulement du corps de la pompe 24. La figure 8 montre en statique, lorsque la roue 21 ne tourne pas. La figure 9 montre en dynamique lorsque la roue 21 tourne. La flèche indique le sens de rotation.The figures 8 and 9 show in cross section the belt tread of the wheel 21 and the tread of the pump housing 24. The figure 8 shows in static, when the wheel 21 is not turning. The figure 9 shows dynamically when the wheel 21 turns. The arrow indicates the direction of rotation.

Le palier fluide est de 4 à 10x10-4 m, soit entre 1 et 2/1000ème du diamètre d'entrée de la roue 21.The fluid level is 4 to 10x10 -4 m, i.e. between 1 and 2/1000 th of the inlet diameter of wheel 21.

On appelle « jeu radial » la différence entre rayon de la bande de roulement du corps de la pompe et rayon de la bande de roulement de la roue 21. The term “radial clearance ” is used to denote the difference between the radius of the tread of the pump body and the radius of the tread of the wheel 21.

La figure 10 montre en coupe l'arbre 20 terminé par sa trompette, une roue 21 avec une ceinture et le corps de la pompe 24.The figure 10 shows in section the shaft 20 terminated by its trumpet, a wheel 21 with a belt and the body of the pump 24.

Sur cette figure, il est visible le jeu radial entre la roue 21 et le corps de la pompe 24.In this figure, it is visible the radial play between the impeller 21 and the body of the pump 24.

La figure 11 montre l'arbre 20 et des trous traversants.The figure 11 shows shaft 20 and through holes.

LISTE DES SIGNES DE RÉFÉRENCELIST OF REFERENCE SIGNS

[Tableaux 1][Tables 1] RéférencesReferences DésignationsDesignations 2020 arbretree 2121 rouewheel 2222 intradosintrados 2323 extradosextrados 2424 corps de la pompepump body

Claims (9)

  1. A system for driving a pump impeller (21), including an impeller (21), a drive motor and a shaft (20), the shaft (20) being formed of a hollow cylindrical tube, of circular section and comprising two ends, one of the two ends including a flare in the shape of a trumpet horn, the other remaining cylindrical to be connected to the drive motor, the system being characterised in that said impeller (21) includes a surface adapted to be implanted on said flare in an integral manner, the impeller (21) including a hub the shape of which corresponds to the trumpet horn shape of the shaft (20).
  2. The system according to claim 1, wherein the end of the shaft (20) connected to the drive motor is plugged.
  3. The system according to claim 1, wherein the shaft (20) is made of composite material.
  4. The system according to claim 1, wherein the impeller (21) is made of composite material.
  5. The system according to claim 1, wherein the assembly of the impeller (21) on the shaft (20) is achieved by gluing at the contact surface of the flare of the shaft (20) and the trumpet horn shape of the impeller (21) hub.
  6. The system according to claim 5, wherein at the surface of contact between the trumpet horn of the shaft (20) and the impeller (21), the shaft and the impeller each include at least one opposite through hole filled with glue.
  7. The system according to claim 1, wherein the opposite end is connected to a motor shaft by clamping, said clamping being adapted to rotate the shaft (20).
  8. The system according to claim 2, wherein the shaft (20) includes through holes adapted to pass a fluid.
  9. The system according to claim 1, wherein the impeller (21) includes blades interconnected by an outer casing called belt.
EP19201286.2A 2018-10-03 2019-10-03 System for driving a pump impeller Active EP3633205B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1871119A FR3086981B1 (en) 2018-10-03 2018-10-03 PUMP WHEEL DRIVE SYSTEM

Publications (2)

Publication Number Publication Date
EP3633205A1 EP3633205A1 (en) 2020-04-08
EP3633205B1 true EP3633205B1 (en) 2021-10-06

Family

ID=65444224

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19201286.2A Active EP3633205B1 (en) 2018-10-03 2019-10-03 System for driving a pump impeller

Country Status (2)

Country Link
EP (1) EP3633205B1 (en)
FR (1) FR3086981B1 (en)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE387791C (en) * 1921-03-10 1924-01-04 Hans Wiedemann Ship driver acting by generating negative pressure
FR1074689A (en) * 1951-12-14 1954-10-07 Self Priming Pump & Eng Co Ltd Improvements in the production of centrifugal pumps
SE519109C2 (en) * 2000-06-07 2003-01-14 Rolls Royce Ab Drive system for the operation of vessels

Also Published As

Publication number Publication date
FR3086981B1 (en) 2021-07-30
EP3633205A1 (en) 2020-04-08
FR3086981A1 (en) 2020-04-10

Similar Documents

Publication Publication Date Title
FR2632686A1 (en)
WO2009138445A1 (en) Compressor impeller blade with variable elliptic connection
FR2931904A1 (en) COMPRESSOR ROTOR BLADE CLEARANCE
FR2645184A1 (en) APPARATUS FOR FLUIDIZING, DEGASSING AND PUMPING A SUSPENSION OF A FIBROUS CELLULOSIC MATERIAL
EP3011185B1 (en) Centrifugal rotor
FR2605060A1 (en) CENTRIFUGAL WHEEL PUMP WITH BANDAGE
WO1999050573A1 (en) Improved blade wheel
EP3633205B1 (en) System for driving a pump impeller
EP3607211B1 (en) Reinforced axial diffuser
FR3033180A1 (en) ASSEMBLY OF A REPORTED PLATFORM OF BLOWER BLADE ON A BLOWER DISK
EP2929161B1 (en) Centrifugal compressor of a gas turbine or a pump comprising a rim and a shroud
FR3042825B1 (en) DAWN AND BLOWER DISK
EP4073371B1 (en) Aeronautical propulsion system having a low leakage flow rate and improved propulsion efficiency
FR3006011A1 (en) PROCESS FOR MANUFACTURING A ROTATING PART OF A HYDRAULIC MACHINE, ROTATING PART MANUFACTURED ACCORDING TO THIS METHOD, HYDRAULIC MACHINE AND ENERGY CONVERSION PLANT
EP3935273B1 (en) Counter rotating gas turbine for an aircraft
FR3024497B1 (en) TURBOMACHINE ASSEMBLY FOR DRIVING A FLOW FLUID ALREADY USED FOR A FEEDING ELEMENT
CA3073106A1 (en) Modified acoustic secondary nozzle
FR2978502A1 (en) HYDRAULIC TURBINE TRAINED AT THE END OF A REDUCED WING
EP3899207B1 (en) Turbomachine assembly comprising fan blades with an extended trailing edge
WO2017137701A1 (en) System for rotating a fan of a turbojet engine
EP0823027B1 (en) Magnetic drive centrifugal pump
FR3130892A1 (en) Lubricant recovery device in a turbomachine
FR3117531A1 (en) Impeller assembly
FR3032243A1 (en) CENTRIFUGAL PUMP
FR3118787A1 (en) PROPULSION ASSEMBLY FOR AIRCRAFT COMPRISING A RECTIFIER VANE INTEGRATED IN AN UPSTREAM PART OF A REDUCED HEIGHT ATTACHMENT MAST

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN PUBLISHED

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE

17P Request for examination filed

Effective date: 20201006

RBV Designated contracting states (corrected)

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: GRANT OF PATENT IS INTENDED

INTG Intention to grant announced

Effective date: 20210503

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE PATENT HAS BEEN GRANTED

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

Free format text: NOT ENGLISH

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

Ref country code: AT

Ref legal event code: REF

Ref document number: 1436473

Country of ref document: AT

Kind code of ref document: T

Effective date: 20211015

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

Free format text: LANGUAGE OF EP DOCUMENT: FRENCH

REG Reference to a national code

Ref country code: DE

Ref legal event code: R096

Ref document number: 602019008145

Country of ref document: DE

REG Reference to a national code

Ref country code: NL

Ref legal event code: FP

REG Reference to a national code

Ref country code: LT

Ref legal event code: MG9D

REG Reference to a national code

Ref country code: AT

Ref legal event code: MK05

Ref document number: 1436473

Country of ref document: AT

Kind code of ref document: T

Effective date: 20211006

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: RS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211006

Ref country code: LT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211006

Ref country code: FI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211006

Ref country code: BG

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20220106

Ref country code: AT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211006

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20220206

Ref country code: SE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211006

Ref country code: PT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20220207

Ref country code: PL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211006

Ref country code: NO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20220106

Ref country code: LV

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211006

Ref country code: HR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211006

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20220107

Ref country code: ES

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211006

REG Reference to a national code

Ref country code: DE

Ref legal event code: R097

Ref document number: 602019008145

Country of ref document: DE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SM

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211006

Ref country code: SK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211006

Ref country code: RO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211006

Ref country code: EE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211006

Ref country code: DK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211006

Ref country code: CZ

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211006

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed

Effective date: 20220707

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211006

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211006

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MC

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211006

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20221003

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20221031

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20221031

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20221003

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 20231027

Year of fee payment: 5

Ref country code: FR

Payment date: 20230922

Year of fee payment: 5

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20231030

Year of fee payment: 5

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: IT

Payment date: 20231027

Year of fee payment: 5

Ref country code: DE

Payment date: 20231027

Year of fee payment: 5

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: BE

Payment date: 20231026

Year of fee payment: 5

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: HU

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT; INVALID AB INITIO

Effective date: 20191003

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CY

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211006

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211006