EP1210520A1 - Magnetically driven pump - Google Patents

Magnetically driven pump

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Publication number
EP1210520A1
EP1210520A1 EP00960799A EP00960799A EP1210520A1 EP 1210520 A1 EP1210520 A1 EP 1210520A1 EP 00960799 A EP00960799 A EP 00960799A EP 00960799 A EP00960799 A EP 00960799A EP 1210520 A1 EP1210520 A1 EP 1210520A1
Authority
EP
European Patent Office
Prior art keywords
partition
magnets
pump according
pump
series
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP00960799A
Other languages
German (de)
French (fr)
Other versions
EP1210520B1 (en
Inventor
Claude Terracol
Guy Jean Villette
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.)
Siebec SA
Original Assignee
Siebec SA
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 Siebec SA filed Critical Siebec SA
Publication of EP1210520A1 publication Critical patent/EP1210520A1/en
Application granted granted Critical
Publication of EP1210520B1 publication Critical patent/EP1210520B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/04—Shafts or bearings, or assemblies thereof
    • F04D29/046—Bearings
    • F04D29/047—Bearings hydrostatic; hydrodynamic
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/021—Units comprising pumps and their driving means containing a coupling
    • F04D13/024—Units comprising pumps and their driving means containing a coupling a magnetic coupling
    • F04D13/025—Details of the can separating the pump and drive area
    • 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

Definitions

  • the invention relates to a magnetic drive pump comprising:
  • a pump element provided with a first impeller driven in the form of a wheel rotatably mounted in a body associated with suction and discharge pipes,
  • a drive motor provided with a transmission shaft on which is mounted a second drive rotor carrying a second series of magnets, the two series of magnets being arranged concentrically to achieve a magnetic coupling in rotation
  • the sealing wall is particularly important when the pumped liquid has a corrosive character, which is frequently the case in chemistry or electroplating.
  • the pumps currently used can be classified into two main categories:
  • the motor 1 is connected to the centrifugal impeller 2 by an axis 3 and a rigid coupling device 4.
  • the impeller 2 rotates in the pump body 5 which communicates with the suction 6 and discharge pipes 7.
  • the leaktightness of the pump body when passing the axis 3 is ensured by the friction seal 8.
  • a second potential defect concerns the seal itself which cannot be guaranteed in a perfect manner, due to the small surface defects that can be meet on the bearing surfaces in friction, and the inevitable creation of a liquid film between these surfaces.
  • the driven rotor 22 secured to the wheel 12 is equipped with a series of magnets 23.
  • the magnets 21, 23 are organized so that a north pole on the drive side is opposite a south pole on the driven side, and vice versa. A magnetic coupling is thus obtained without mechanical contact, coupling which must therefore be sufficient to withstand without lifting the maximum torque absorbed by the wheel.
  • the device for positioning and guiding in rotation of the wheel 12 according to FIG. 2 consists of:
  • FIG. 2 clearly shows the drawbacks inherent in the mounting of the axis 24 with regard to the precision, therefore the control of the games. Its positioning relative to the axis of the motor (with which it must theoretically be aligned), in fact passes through two parts whose precision and rigidity can pose a problem: the spacer 19 and especially the partition 18. We have seen in effect that the latter must be thin to pass in the air gap and not to produce too much eddy currents.
  • the document FR-A-231 1201 describes a magnetic drive pump, in which the turbine is equipped with a magnetic core and is driven by the magnetic crown through a watertight partition.
  • the rotary turbine is supported by a fixed shaft, which is guided by a pair of bearings on the magnetic ring in connection with the motor shaft.
  • the presence of the bearings in addition to the output bearing from the motor shaft gives the assembly a significant overhang, and additional embedding.
  • the axial size of the pump is important, and the positioning of the turbine shaft does not allow perfect alignment.
  • the object of this patent is to propose a solution which makes it possible to remedy the above drawbacks, that is to say on the one hand to ensure perfect centering of the axis of rotation of the pump impeller, while unloading the bulkhead of this function, and on the other hand by seeking an efficient evacuation of calories to a cooling element.
  • a female cylindrical bearing serves as a concentric housing for the tip to obtain a mechanical support and precise centering of the partition and the first driven rotor.
  • the axis of the motor is advantageously extended by a length sufficient to allow it to enter the heart of the driven rotor.
  • the axis of the motor includes the axis of the wheel which, when fixed, becomes rotating. It is obviously not this rotation which is sought, but the fact of having for the first driven rotor, a rigid support and perfectly aligned with the motor axis.
  • the first driven rotor comprises a second ring which journals on a first ring secured to the fixed partition.
  • the bearing integrated into the partition comprises at least one self-lubricating ring constituting a thermal bridge for the evacuation of the calories generated by the journaling of the first driven rotor towards the radiator formed by the motor shaft.
  • the sealing partition should not be interrupted, it is therefore necessary to complicate its shape a little to make it bypass the extended nozzle, which belongs to the area external to the pumping circuit, while the axis 24 according to FIG. 2 of the prior art belonged to the internal area.
  • the partition In addition to the cylindrical part present in the air gap, the partition must therefore have a second cylindrical part which engages on the end of the motor axis, with the interposition of a friction sleeve, made for example of self-lubricating material. .
  • This axis now ensuring the positioning of the driven rotor with the desired precision and rigidity, this function no longer has to be provided by the sealing partition, which can therefore be significantly reduced.
  • this partition can be made in one piece, in a material chemically compatible with the pumped liquid.
  • the part must remain capable of withstanding the pressure of the liquid present around the driven rotor, a non-negligible pressure since it may be close to the discharge pressure of the pump. In cases where this pressure is high, and where there is no chemically compatible material having sufficient mechanical strength, it can be reduced to a mixed partition solution comprising a mechanically resistant outer shell, and a chemically compatible inner shell.
  • the external envelope can therefore be much thinner, which makes it possible to envisage making it:
  • the configuration described above has an obvious advantage, insofar as it reveals a thermal bridge of large cross section and thin between the bearing of the driven rotor and the shaft of the engine.
  • this advantage is mitigated by the fact that it is necessary to evacuate in addition the calories produced by the rotation of the additional end piece of the motor shaft in its own bearing, but we are there out reaching the pumped liquid, which makes it possible to use conventional mechanical components, the performance of which is excellent.
  • the sealing partition is shaped for chemical compatibility, while the precision and mechanical strength are ensured by an additional part partially matching the shape of the partition, and made of a material having a good mechanical strength.
  • the additional part can be made of a metal alloy, in particular stainless steel, and includes a ferrule fitting into the air gap formed between the two series of magnets. The thickness of the ferrule is less than that of the enclosure of the partition.
  • FIG 1 shows a schematic elevational view of a conventional motor pump assembly with friction seal.
  • FIG. 2 represents a schematic elevation view of a conventional motor-driven pump unit with magnetic drive.
  • FIG. 3 represents a view in elevation and in section of a magnetic drive according to the invention.
  • FIG. 3 This embodiment is illustrated by FIG. 3 in which we find:
  • the wheel of the first driven rotor 32 equipped with the first series of magnets 33 and a steel tube 37
  • the second drive rotor 30 equipped with the second series of magnets 31 and a steel tube 38
  • the tubes 37 and 38 having the function of ensuring the looping of the magnetic flux of the permanent magnets 31, 33.
  • the tubes 37, 38 and the magnets 31, 33 are fixed respectively to the second rotor 30 and to the wheel 32 by any suitable means, in particular by overmolding, the fixed ring 35 and the rotating ring 36 constituting the rotation bearing of the wheel,
  • a nozzle 42 extends the motor shaft 41, of which it can be an integral part, or on which it can be assembled with rigidity and precision.
  • the nozzle 42 is arranged to receive the attachment of the second drive rotor 30, this attachment being provided by any suitable mechanical means.
  • the sealing partition consists of a casing 48 made of material chemically compatible with the pumped liquid, and of a cylindrical shell 52 made of mechanically resistant material, in particular stainless steel. This ferrule makes it possible to provide resistance to internal pressure, insofar as the material constituting the envelope 48 may be insufficiently resistant.
  • the envelope 48 is extended inwards by a part forming a sheath, into which the end piece 42 is introduced axially.
  • the casing 48 carries: externally, the fixed ring 35, on which the wheel 32 is journalled, by means of its integral ring 36. internally, a steel sheath 53, in which will be fitted the self-lubricating rings 54, 54 'which engage themselves on the end piece 42.
  • the ring 35 and the sheath 53 can advantageously be molded into the envelope of the partition 48 during the molding of the latter.
  • the centering of the ring 35, and of the rotor wheel 32, is now ensured with precision by the end piece 42. This results in good concentricity of the parts 35, 53, 54, 54 ', and the play between the end piece 42 and the sockets 54, 54 'is very small.
  • the sealing partition is therefore completely relieved of the centering function, and therefore no longer has to be very rigid. On the contrary, it is desirable for it to have a minimum of flexibility, so as not to interfere with the centering imposed by the end piece 42.
  • the device of FIG. 3 allows good evacuation towards the outside of the calories generated by the rotation of the rotor wheel.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • External Artificial Organs (AREA)
  • Sealing Devices (AREA)
  • Electromagnetic Pumps, Or The Like (AREA)

Abstract

A magnetically driven pump comprises a sealing partition 48 whereof the central portion forms the rotational axis of the rotating portion of the pump, that central portion being itself supported and centered by a rotating connection piece 42 linked to or integral with drive shaft 41 of the motor 29.

Description

POMPE A ENTRAINEMENT MAGNETIQUEMAGNETIC DRIVE PUMP
Domaine technique de l'inventionTechnical field of the invention
L'invention est relative à une pompe à entraînement magnétique comprenant :The invention relates to a magnetic drive pump comprising:
-un élément de pompe pourvu d'un premier rotor entraîné en forme de roue montée à rotation dans un corps associé à des tuyauteries d'aspiration et de refoulement,a pump element provided with a first impeller driven in the form of a wheel rotatably mounted in a body associated with suction and discharge pipes,
-une première série d'aimants solidaires du premier rotor,a first series of magnets integral with the first rotor,
-un moteur d'entraînement doté d'un arbre de transmission sur lequel est monté un deuxième rotor d'entraînement portant une deuxième série d'aimants, les deux séries d'aimants étant disposées concentriquement pour réaliser un couplage magnétique en rotation,a drive motor provided with a transmission shaft on which is mounted a second drive rotor carrying a second series of magnets, the two series of magnets being arranged concentrically to achieve a magnetic coupling in rotation,
-et un dispositif d'étanchéité ayant une cloison fixe s'étendant dans l'entrefer entre les deux séries d'aimants en assurant une séparation étanche entre l'élément de pompe et le moteur.-and a sealing device having a fixed partition extending in the air gap between the two series of magnets ensuring a sealed separation between the pump element and the motor.
La paroi d'étanchéité est particulièrement importante quand le liquide pompé présente un caractère corrosif, ce qui est fréquemment le cas dans la chimie ou la galvanoplastie.The sealing wall is particularly important when the pumped liquid has a corrosive character, which is frequently the case in chemistry or electroplating.
Pour ces applications, qui supportent mal les arrêts, ii est par ailleurs important que les interventions de maintenance soient aussi réduites que possible, voire supprimées. Etat de la techniqueFor these applications, which do not support shutdowns well, it is also important that maintenance interventions are as reduced as possible, or even eliminated. State of the art
On peut classer les pompes utilisées actuellement en deux grandes catégories :The pumps currently used can be classified into two main categories:
-les pompes à garniture d'étanchéité ( figure 1), comportant des pièces en frottement montées en partie fixe d'une part, et en partie tournante d'autre part, la nature des matériaux en présence et la qualité de leur état de surface permettant d'obtenir une étanchéité satisfaisante ;-the seal packing pumps (Figure 1), comprising friction parts mounted in a fixed part on the one hand, and in a rotating part on the other hand, the nature of the materials present and the quality of their surface condition allowing to obtain a satisfactory seal;
- les pompes à entraînement magnétique (figure 2), qui ont été conçues pour remédier aux inconvénients précités, assurant l'étanchéité, non plus par des pièces en frottement, mais par une cloison continue. De part et d'autre de cette cloison, se trouvent un rotor d'entraînement lié au moteur, et un rotor entraîné lié à la roue de la pompe. Les deux rotors portent des aimants disposés de telle sorte qu'ils assurent un couplage magnétique entre les deux rotors.- Magnetic drive pumps (Figure 2), which have been designed to remedy the aforementioned drawbacks, ensuring sealing, no longer by friction parts, but by a continuous partition. On either side of this partition, there is a drive rotor linked to the motor, and a driven rotor linked to the pump wheel. The two rotors carry magnets arranged in such a way that they provide a magnetic coupling between the two rotors.
Sur la figure 1 , le moteur 1 est relié à la roue centrifuge 2 par un axe 3 et un dispositif d'accouplement rigide 4. La roue 2 tourne dans le corps de pompe 5 qui communique avec les tuyauteries d'aspiration 6 et de refoulement 7. L'étanchéité du corps de pompe au passage de l'axe 3 est assurée par le joint à frottement 8.In FIG. 1, the motor 1 is connected to the centrifugal impeller 2 by an axis 3 and a rigid coupling device 4. The impeller 2 rotates in the pump body 5 which communicates with the suction 6 and discharge pipes 7. The leaktightness of the pump body when passing the axis 3 is ensured by the friction seal 8.
Le premier défaut qu'on peut reprocher à ce type de pompe est que les pièces en frottement constituant ce joint sont sujettes à usure, et qu'il faut donc les remplacer périodiquement, ce qui donne lieu à des arrêts pour maintenance. Cette opération de remplacement est d'autant plus délicate que le joint 8 est localisé dans une zone peu accessible.The first fault that can be criticized for this type of pump is that the friction parts constituting this seal are subject to wear, and that they must therefore be replaced periodically, which gives rise to downtime for maintenance. This replacement operation is all the more delicate since the seal 8 is located in an area that is not very accessible.
Un second défaut potentiel concerne l'étanchéité elle-même qui ne peut être garantie de façon parfaite, en raison des petits défauts de surface qu'on peut rencontrer sur les faces d'appui en frottement, et de la création inévitable d'un film liquide entre ces surfaces.A second potential defect concerns the seal itself which cannot be guaranteed in a perfect manner, due to the small surface defects that can be meet on the bearing surfaces in friction, and the inevitable creation of a liquid film between these surfaces.
Sur .la figure 2, on retrouve le moteur 11 , la roue 12, le corps de pompe 15, les tuyauteries d'aspiration 16 et de refoulement 17. L'étanchéité est ici assurée par la cloison continue 18 assemblée rigidement et hermétiquement entre le corps de pompe 15 et l'entretoise 19 assurant la liaison avec la bride du moteur 11. Sur l'axe du moteur 11 est monté rigidement le rotor d'entraînement 20 dans lequel est insérée, par exemple par surmoulage, une série d'aimants 21.On. Figure 2, we find the motor 11, the impeller 12, the pump body 15, the suction 16 and discharge pipes 17. The seal is here provided by the continuous partition 18 rigidly and hermetically assembled between the pump body 15 and the spacer 19 ensuring the connection with the motor flange 11. On the axis of the motor 11 is rigidly mounted the drive rotor 20 in which is inserted, for example by overmolding, a series of magnets 21.
Le rotor entraîné 22 solidaire de la roue 12 est équipé par une série d'aimants 23. Les aimants 21 , 23 sont organisés pour qu'un pôle nord côté entraînement soit en face d'un pôle sud côté entraîné, et inversement. On obtient ainsi un couplage magnétique sans contact mécanique, couplage qui doit donc être suffisant pour supporter sans décrochage le couple maximum absorbé par la roue.The driven rotor 22 secured to the wheel 12 is equipped with a series of magnets 23. The magnets 21, 23 are organized so that a north pole on the drive side is opposite a south pole on the driven side, and vice versa. A magnetic coupling is thus obtained without mechanical contact, coupling which must therefore be sufficient to withstand without lifting the maximum torque absorbed by the wheel.
Une bonne efficacité du couplage exige que l'entrefer entre les deux familles d'aimants soit aussi réduit que possible. Cet entrefer étant constitué par l'épaisseur de la cloison 18 et par les jeux présents de part et d'autre de celle-ci, on voit qu'il faut chercher :Good coupling efficiency requires that the air gap between the two families of magnets be as small as possible. This air gap being constituted by the thickness of the partition 18 and by the clearances present on either side thereof, it is seen that it is necessary to seek:
- à minimiser l'épaisseur de la cloison, ce qui suppose qu'on ne la sollicite pas trop sur le plan mécanique, et/ou qu'on la réalise dans un matériau présentant une bonne rigidité ;- Minimize the thickness of the partition, which assumes that it is not stressed too mechanically, and / or that it is made of a material having good rigidity;
- à réduire les jeux, ce qui suppose une bonne maîtrise dimensionnelle des pièces concernées, ainsi que de leur positionnement.- to reduce backlash, which presupposes good dimensional control of the parts concerned, as well as their positioning.
Sur le premier point, il peut y avoir contradiction entre la tenue mécanique de la cloison et sa compatibilité chimique avec le liquide pompé, avec lequel elle est en contact par sa face interne. Une solution couramment utilisée consiste à réaliser cette cloison par juxtaposition de deux matériaux :On the first point, there may be a contradiction between the mechanical strength of the partition and its chemical compatibility with the pumped liquid, with which it is in contact through its internal face. A commonly used solution consists in making this partition by juxtaposing two materials:
-extérieurement, une partie métallique amagnétique fournissant précision et rigidité, -intérieurement, une partie en matériau synthétique chimiquement compatible.- externally, a non-magnetic metallic part providing precision and rigidity, - internally, a part made of chemically compatible synthetic material.
Cette disposition résout assez bien le problème, mais elle présente deux inconvénients non négligeables :This arrangement solves the problem fairly well, but it has two significant drawbacks:
-augmentation de l'épaisseur, et donc de l'entrefer. -présence de courants de Foucault dans la paroi métallique, ces courants étant induits par la rotation du flux des aimants. Ces courants de Foucault constituent une source d'échauffement qui peut devenir prohibitive, notamment pour de grosses unités.-increase in thickness, and therefore in the air gap. -presence of eddy currents in the metal wall, these currents being induced by the rotation of the flux of the magnets. These eddy currents constitute a source of heating which can become prohibitive, in particular for large units.
Pour aborder le second point, à savoir les jeux, le dispositif de positionnement et de guidage en rotation de la roue 12 selon la figure 2, est constitué :To address the second point, namely the games, the device for positioning and guiding in rotation of the wheel 12 according to FIG. 2, consists of:
-d'un axe fixe 24, monté avec rigidité et précision sur la cloison 18, -d'une bague fixe 25 solidaire de l'axe 24, -et d'une bague tournante 26 solidaire de la roue 12.-a fixed pin 24, rigidly and precisely mounted on the partition 18, -a fixed ring 25 secured to the axis 24, -and a rotating ring 26 secured to the wheel 12.
La qualité et la disposition des bagues 24, 25 sont évidemment essentielles pour la tenue de la pompe, avec notamment :The quality and arrangement of the rings 24, 25 are obviously essential for the holding of the pump, with in particular:
-un dimensionnement aussi large que possible des surfaces en contact, -un choix judicieux des matériaux (céramique, carbure de silicium, graphite....) et de leur état de surface.-a dimensioning as wide as possible of the surfaces in contact, -a judicious choice of materials (ceramic, silicon carbide, graphite ...) and their surface condition.
-une utilisation judicieuse du liquide pompé pour assurer la lubrification -une évacuation aussi bonne que possible des calories générées par le frottement. L'examen de la figure 2 montre clairement les inconvénients inhérents au montage de l'axe 24 en ce qui concerne la précision, donc la maîtrise des jeux. Son positionnement par rapport à l'axe du moteur (avec lequel il doit théoriquement être aligné), passe en effet par deux pièces dont la précision et la rigidité peuvent poser problème : l'entretoise 19 et surtout la cloison 18. On a vu en effet que cette dernière doit être mince pour passer dans l'entrefer et ne pas produire trop de courants de Foucault.- judicious use of the pumped liquid to ensure lubrication - as good an evacuation as possible of the calories generated by friction. The examination of FIG. 2 clearly shows the drawbacks inherent in the mounting of the axis 24 with regard to the precision, therefore the control of the games. Its positioning relative to the axis of the motor (with which it must theoretically be aligned), in fact passes through two parts whose precision and rigidity can pose a problem: the spacer 19 and especially the partition 18. We have seen in effect that the latter must be thin to pass in the air gap and not to produce too much eddy currents.
Il sera donc très difficile d'obtenir un bon encastrement de l'axe 24. Il a été proposé d'améliorer la tenue mécanique en installant un palier additionnel à l'autre extrémité de la roue, mais cette solution augmente notablement la complexité sans résoudre parfaitement le problème.It will therefore be very difficult to obtain good embedding of the axis 24. It has been proposed to improve the mechanical strength by installing an additional bearing at the other end of the wheel, but this solution significantly increases the complexity without solving the problem perfectly.
Enfin, concernant l'évacuation des calories absorbées par l'axe 24, il faut noter qu'elle doit se faire à travers la cloison 18 qui s'y prête assez mal, toujours du fait de sa minceur.Finally, concerning the evacuation of the calories absorbed by the axis 24, it should be noted that it must be done through the partition 18 which lends itself to it quite poorly, still due to its thinness.
Le document FR-A-231 1201 décrit une pompe à entraînement magnétique, dans laquelle la turbine est équipée d'un noyau magnétique et est entraînée par la couronne magnétique à travers une cloison étanche. La turbine rotative est supportée par un arbre fixe, lequel est guidé par une paire de roulements sur la couronne magnétique en liaison avec l'arbre moteur. La présence des roulements en plus du roulement de sortie de l'arbre moteur confère à l'ensemble un porte à faux important, et un encastrement supplémentaire. L'encombrement axial de la pompe est important, et le positionnement de l'arbre de la turbine ne permet pas d'obtenir un alignement parfait.The document FR-A-231 1201 describes a magnetic drive pump, in which the turbine is equipped with a magnetic core and is driven by the magnetic crown through a watertight partition. The rotary turbine is supported by a fixed shaft, which is guided by a pair of bearings on the magnetic ring in connection with the motor shaft. The presence of the bearings in addition to the output bearing from the motor shaft gives the assembly a significant overhang, and additional embedding. The axial size of the pump is important, and the positioning of the turbine shaft does not allow perfect alignment.
Objet de l'inventionSubject of the invention
L'objet du présent brevet est de proposer une solution permettant de remédier aux inconvénients ci-dessus, c'est-à-dire d'assurer d'une part un centrage parfait de l'axe de rotation de la roue de la pompe, tout en déchargeant la cloison d'étanchéité de cette fonction, et d'autre part en recherchant une évacuation efficace des calories vers un élément de refroidissement.The object of this patent is to propose a solution which makes it possible to remedy the above drawbacks, that is to say on the one hand to ensure perfect centering of the axis of rotation of the pump impeller, while unloading the bulkhead of this function, and on the other hand by seeking an efficient evacuation of calories to a cooling element.
La pompe selon l'invention est caractérisée en ce que :The pump according to the invention is characterized in that:
• le premier rotor entraîné tourillonne sur une portée cylindrique dont le positionnement et le soutien sont assurés par un embout axial s'étendant dans le prolongement de l'arbre du moteur, un palier cylindrique femelle sert de logement concentrique à l'embout pour obtenir un soutien mécanique et un centrage précis de la cloison et du premier rotor entraîné.• the first driven rotor swivels on a cylindrical surface whose positioning and support are ensured by an axial tip extending in the extension of the motor shaft, a female cylindrical bearing serves as a concentric housing for the tip to obtain a mechanical support and precise centering of the partition and the first driven rotor.
L'axe du moteur est prolongé avantageusement d'une longueur suffisante pour lui permettre de s'introduire au cœur du rotor entraîné. Il en résulte que l'axe du moteur englobe l'axe de la roue qui, de fixe, devient tournant. Ce n'est évidemment pas cette rotation qui est recherchée, mais le fait de disposer pour le premier rotor entraîné, d'un support rigide et parfaitement aligné avec l'axe moteur.The axis of the motor is advantageously extended by a length sufficient to allow it to enter the heart of the driven rotor. As a result, the axis of the motor includes the axis of the wheel which, when fixed, becomes rotating. It is obviously not this rotation which is sought, but the fact of having for the first driven rotor, a rigid support and perfectly aligned with the motor axis.
Selon un mode de réalisation préférentiel,, le premier rotor entraîné comporte une deuxième bague qui tourillonne sur une première bague solidaire de la cloison fixe.According to a preferred embodiment, the first driven rotor comprises a second ring which journals on a first ring secured to the fixed partition.
Le palier intégré à la cloison comprend au moins une bague autoiubrifiante constituant un pont thermique pour l'évacuation des calories générées par le tourillonnement du premier rotor entraîné vers le radiateur formé par l'arbre moteur.The bearing integrated into the partition comprises at least one self-lubricating ring constituting a thermal bridge for the evacuation of the calories generated by the journaling of the first driven rotor towards the radiator formed by the motor shaft.
La cloison d'étanchéité ne devant pas être interrompue, il faut donc compliquer un peu sa forme pour lui faire contourner l'embout prolongé, qui appartient à la zone externe au circuit de pompage, alors que l'axe 24 selon la figure 2 de l'art antérieur appartenait à la zone interne.The sealing partition should not be interrupted, it is therefore necessary to complicate its shape a little to make it bypass the extended nozzle, which belongs to the area external to the pumping circuit, while the axis 24 according to FIG. 2 of the prior art belonged to the internal area.
En plus de la partie cylindrique présente dans l'entrefer, la cloison devra donc présenter une seconde partie cylindrique venant s'engager sur l'extrémité de l'axe moteur, avec interposition d'une douille de frottement, réalisée par exemple en matériau autolubrifiant. Cet axe assurant maintenant le positionnement du rotor entraîné avec la précision et la rigidité voulues, cette fonction n'a plus à être assurée par la cloison d'étanchéité, qui peut donc être sensiblement allégée. Dans le mode de réalisation le plus simple, cette cloison peut être réalisée en une seule pièce, dans un matériau chimiquement compatible avec le liquide pompé.In addition to the cylindrical part present in the air gap, the partition must therefore have a second cylindrical part which engages on the end of the motor axis, with the interposition of a friction sleeve, made for example of self-lubricating material. . This axis now ensuring the positioning of the driven rotor with the desired precision and rigidity, this function no longer has to be provided by the sealing partition, which can therefore be significantly reduced. In the simplest embodiment, this partition can be made in one piece, in a material chemically compatible with the pumped liquid.
Il faut toutefois noter que la pièce doit rester capable de supporter la pression du liquide présent autour du rotor entraîné, pression non négligeable puisqu'elle peut être voisine de la pression de refoulement de la pompe. Dans les cas où cette pression est élevée, et où il n'existe pas de matériau chimiquement compatible présentant la tenue mécanique suffisante, on peut être ramené à une solution de cloison mixte comportant une enveloppe externe mécaniquement résistante, et une enveloppe interne chimiquement compatible.It should however be noted that the part must remain capable of withstanding the pressure of the liquid present around the driven rotor, a non-negligible pressure since it may be close to the discharge pressure of the pump. In cases where this pressure is high, and where there is no chemically compatible material having sufficient mechanical strength, it can be reduced to a mixed partition solution comprising a mechanically resistant outer shell, and a chemically compatible inner shell.
On n'est pas pour autant ramené aux mêmes contraintes qu'avec les pompes classiques correspondant à la figure 2. En effet, la tenue à la pression interne est bien plus facile à assurer que la rigidité et la précision.It is not however reduced to the same constraints as with the conventional pumps corresponding to FIG. 2. In fact, the resistance to internal pressure is much easier to ensure than rigidity and precision.
L'enveloppe externe pourra donc être beaucoup plus mince, ce qui permet d'envisager de la réaliser :The external envelope can therefore be much thinner, which makes it possible to envisage making it:
-soit en métal amagnétique, comme dans la solution classique, mais en adoptant une épaisseur très faible, ce qui ramène les pertes par courants de Foucault à une valeur admissible ;either in non-magnetic metal, as in the conventional solution, but adopting a very small thickness, which reduces the eddy current losses to an admissible value;
-soit en matériau synthétique (polyamide ou polycarbonate chargés par exemple), ce qui impose une augmentation modérée de l'entrefer, mais supprime totalement les courants de Foucault.-Either in synthetic material (polyamide or polycarbonate loaded for example), which requires a moderate increase in the air gap, but completely eliminates the eddy currents.
Concernant l'évacuation des calories générées par la rotation, la configuration décrite ci-dessus présente un avantage évident, dans la mesure où elle fait apparaître un pont thermique de forte section et de faible épaisseur entre le palier du rotor entraîné et l'arbre du moteur. Bien entendu, cet avantage est atténué par le fait qu'il faut évacuer en plus les calories produites par la rotation de l'embout additionnel de l'arbre du moteur dans son propre palier, mais on se trouve là hors d'atteinte du liquide pompé, ce qui permet de faire appel à des composants mécaniques classiques, dont le rendement est excellent.Regarding the evacuation of the calories generated by the rotation, the configuration described above has an obvious advantage, insofar as it reveals a thermal bridge of large cross section and thin between the bearing of the driven rotor and the shaft of the engine. Of course, this advantage is mitigated by the fact that it is necessary to evacuate in addition the calories produced by the rotation of the additional end piece of the motor shaft in its own bearing, but we are there out reaching the pumped liquid, which makes it possible to use conventional mechanical components, the performance of which is excellent.
Selon une autre caractéristique de l'invention, la cloison d'étanchéité est conformée pour la compatibilité chimique, tandis que la précision et la tenue mécanique sont assurées par une pièce additionnelle épousant partiellement la forme de la cloison, et réalisée dans un matériau ayant une bonne tenue mécanique. La pièce additionnelle peut être réalisée en alliage métallique, notamment en acier inoxydable, et comprend une virole s'insérant dans l'entrefer ménagé entre les deux séries d'aimants. L'épaisseur de la virole est inférieure à celle de l'enveloppe de la cloison.According to another characteristic of the invention, the sealing partition is shaped for chemical compatibility, while the precision and mechanical strength are ensured by an additional part partially matching the shape of the partition, and made of a material having a good mechanical strength. The additional part can be made of a metal alloy, in particular stainless steel, and includes a ferrule fitting into the air gap formed between the two series of magnets. The thickness of the ferrule is less than that of the enclosure of the partition.
Description sommaire des dessinsBrief description of the drawings
D'autres avantages et caractéristiques ressortiront plus clairement de la description qui va suivre à travers les dessins annexés, donnés à titre d'exemples non limitatifs, et dans lesquels :Other advantages and characteristics will emerge more clearly from the description which will follow through the appended drawings, given by way of nonlimiting examples, and in which:
-la figure 1 représente une vue en élévation schématique d'un ensemble motopompe classique avec garniture d'étanchéité à frottement.FIG 1 shows a schematic elevational view of a conventional motor pump assembly with friction seal.
-la figure 2 représente une vue en élévation schématique d'un ensemble motopompe classique à entraînement magnétique.FIG. 2 represents a schematic elevation view of a conventional motor-driven pump unit with magnetic drive.
-la figure 3 représente une vue en élévation et en coupe d'un entraînement magnétique selon l'invention.FIG. 3 represents a view in elevation and in section of a magnetic drive according to the invention.
Description d'un mode de réalisation préférentielDescription of a preferred embodiment
Ce mode de réalisation est illustré par la figure 3 dans laquelle on retrouve :This embodiment is illustrated by FIG. 3 in which we find:
-le moteur d'entraînement 29,the drive motor 29,
-la roue du premier rotor entraîné 32, équipée de la première série d'aimants 33 et d'un tube en acier 37, -le deuxième rotor d'entraînement 30, équipé de la deuxième série d'aimants 31 et d'un tube en acier 38, les tubes 37 et 38 ayant pour fonction d'assurer le bouclage du flux magnétique des aimants permanents 31 , 33. Les tubes 37, 38 et les aimants 31 , 33 sont fixés respectivement sur le deuxième rotor 30 et sur la roue 32 par tout moyen approprié, notamment par surmoulage, -la bague fixe 35 et la bague tournante 36 constituant le palier de rotation de la roue,the wheel of the first driven rotor 32, equipped with the first series of magnets 33 and a steel tube 37, the second drive rotor 30, equipped with the second series of magnets 31 and a steel tube 38, the tubes 37 and 38 having the function of ensuring the looping of the magnetic flux of the permanent magnets 31, 33. The tubes 37, 38 and the magnets 31, 33 are fixed respectively to the second rotor 30 and to the wheel 32 by any suitable means, in particular by overmolding, the fixed ring 35 and the rotating ring 36 constituting the rotation bearing of the wheel,
-le corps de pompe 45, -et l'entretoise 49 assurant la liaison entre le moteur 29 et le corps de pompe 45.the pump body 45, and the spacer 49 ensuring the connection between the motor 29 and the pump body 45.
Un embout 42 prolonge l'arbre moteur 41 , dont il peut faire partie intégrante, ou sur lequel il peut être assemblé avec rigidité et précision. En plus de sa fonction première, qui est de supporter et de centrer la roue de la pompe, l'embout 42 est agencé pour recevoir la fixation du deuxième rotor d'entraînement 30, cette fixation étant assurée par tout moyen mécanique approprié.A nozzle 42 extends the motor shaft 41, of which it can be an integral part, or on which it can be assembled with rigidity and precision. In addition to its primary function, which is to support and center the pump wheel, the nozzle 42 is arranged to receive the attachment of the second drive rotor 30, this attachment being provided by any suitable mechanical means.
La cloison d'étanchéité se compose d'une enveloppe 48 réalisée en matériau chimiquement compatible avec le liquide pompé, et d'une virole cylindrique 52 réalisée en matériau mécaniquement résistant, notamment en acier inoxydable. Cette virole permet d'apporter la tenue à la pression interne, dans la mesure où le matériau constitutif de l'enveloppe 48 peut être insuffisamment résistant.The sealing partition consists of a casing 48 made of material chemically compatible with the pumped liquid, and of a cylindrical shell 52 made of mechanically resistant material, in particular stainless steel. This ferrule makes it possible to provide resistance to internal pressure, insofar as the material constituting the envelope 48 may be insufficiently resistant.
L'enveloppe 48 se prolonge vers l'intérieur par une partie formant fourreau, dans laquelle s'introduit axialement l'embout 42.The envelope 48 is extended inwards by a part forming a sheath, into which the end piece 42 is introduced axially.
Dans cette zone centrale, l'enveloppe 48 porte : extérieurement, la bague fixe 35, sur laquelle vient tourillonner la roue 32, par l'intermédiaire de sa bague solidaire 36. intérieurement, un fourreau en acier 53, dans lequel viendront s'emmancher les bagues autolubrifiantes 54, 54' qui s'engagent elles-mêmes sur l'embout 42.In this central area, the casing 48 carries: externally, the fixed ring 35, on which the wheel 32 is journalled, by means of its integral ring 36. internally, a steel sheath 53, in which will be fitted the self-lubricating rings 54, 54 'which engage themselves on the end piece 42.
La bague 35 et le fourreau 53 peuvent être avantageusement surmoulés dans l'enveloppe de la cloison 48 lors du moulage de celle-ci. Le centrage de la bague 35, et de la roue du rotor 32, est maintenant assuré avec précision par l'embout 42. Il en résulte une bonne concentricité des pièces 35, 53, 54, 54', et le jeu entre l'embout 42 et les douilles 54, 54' est très réduit.The ring 35 and the sheath 53 can advantageously be molded into the envelope of the partition 48 during the molding of the latter. The centering of the ring 35, and of the rotor wheel 32, is now ensured with precision by the end piece 42. This results in good concentricity of the parts 35, 53, 54, 54 ', and the play between the end piece 42 and the sockets 54, 54 'is very small.
La cloison d'étanchéité est donc totalement déchargée de la fonction de centrage, et n'a donc plus à être très rigide. Il est au contraire souhaitable qu'elle présente un minimum de souplesse, afin de ne pas contrarier le centrage imposé par l'embout 42.The sealing partition is therefore completely relieved of the centering function, and therefore no longer has to be very rigid. On the contrary, it is desirable for it to have a minimum of flexibility, so as not to interfere with the centering imposed by the end piece 42.
En plus de la fonction de centrage, le dispositif de la figure 3 permet une bonne évacuation vers l'extérieur des calories générées par la rotation de la roue du rotorIn addition to the centering function, the device of FIG. 3 allows good evacuation towards the outside of the calories generated by the rotation of the rotor wheel.
32, l'arbre moteur 41 jouant le rôle de radiateur par l'intermédiaire de I' embout 42.32, the drive shaft 41 playing the role of radiator via the end piece 42.
Les calories traversent successivement les pièces 35, 48, 53, 54 et 54' mais tous ces transferts mettent en jeu des épaisseurs faibles et des sections importantes, ce qui conduit à un pont thermique suffisamment efficace.The calories pass successively through the parts 35, 48, 53, 54 and 54 'but all these transfers involve small thicknesses and large sections, which leads to a sufficiently effective thermal bridge.
En variante, on peut envisager de remplacer les douilles 54, 54' par des roulements à aiguilles. Cette solution sera particulièrement intéressante si une grande résistance et une grande longévité sont recherchées. Par contre, elle sera moins efficace sous l'aspect pont thermique. Des solutions mixtes combinant douilles à frottement et roulements à aiguilles sont également envisageables. As a variant, it is possible to envisage replacing the sockets 54, 54 'with needle bearings. This solution will be particularly advantageous if high strength and long service life are sought. On the other hand, it will be less effective under the thermal bridge aspect. Mixed solutions combining friction sleeves and needle bearings are also possible.

Claims

REVENDICATIONS
1. Pompe à entraînement magnétique comprenant :1. Magnetic drive pump comprising:
-un élément de pompe pourvu d'un premier rotor entraîné (32) en forme de roue montée à rotation dans un corps (45) associé à des tuyauteries d'aspiration et de refoulement,a pump element provided with a first driven rotor (32) in the form of a wheel rotatably mounted in a body (45) associated with suction and discharge pipes,
-une première série d'aimants (33) solidaires du premier rotor (32),a first series of magnets (33) integral with the first rotor (32),
-un moteur d'entraînement (29) doté d'un arbre (41) de transmission sur lequel est monté un deuxième rotor d'entraînement (30) portant une deuxième série d'aimants (31 ), les deux séries d'aimants (33, 31) étant disposées concentriquement pour réaliser un couplage magnétique en rotation,a drive motor (29) provided with a transmission shaft (41) on which is mounted a second drive rotor (30) carrying a second series of magnets (31), the two series of magnets ( 33, 31) being arranged concentrically to achieve a magnetic coupling in rotation,
-et un dispositif d'étanchéité ayant une cloison (48) fixe s'étendant dans l'entrefer entre les deux séries d'aimants (33, 31 ) en assurant une séparation étanche entre l'élément de pompe et le moteur (29),-and a sealing device having a fixed partition (48) extending in the air gap between the two series of magnets (33, 31) ensuring a sealed separation between the pump element and the motor (29) ,
caractérisée en ce que :characterized in that:
le premier rotor entraîné (32) tourillonne sur une portée cylindrique dont le positionnement et le soutien sont assurés par un embout (42) axial s'étendant dans le prolongement de l'arbre (41) du moteur (29),the first driven rotor (32) pivots on a cylindrical surface whose positioning and support are ensured by an axial end piece (42) extending in the extension of the shaft (41) of the motor (29),
• un palier cylindrique femelle sert de logement concentrique à l'embout (42) pour obtenir un soutien mécanique et un centrage précis de la cloison (48) et du premier rotor entraîné (32). • a female cylindrical bearing serves as a concentric housing for the end piece (42) to obtain mechanical support and precise centering of the partition (48) and the first driven rotor (32).
2. Pompe selon la revendication 1 , caractérisée en ce que le premier rotor entraîné (32) comporte une deuxième bague (36) qui tourillonne sur une première bague (35) solidaire de la cloison fixe (48).2. Pump according to claim 1, characterized in that the first driven rotor (32) comprises a second ring (36) which pivots on a first ring (35) integral with the fixed partition (48).
3. Pompe selon la revendication 1 ou 2, caractérisée en ce que le palier intégré à la cloison (48) comprend au moins une bague autolubrifiante (54, 54') constituant un pont thermique pour l'évacuation des calories générées par le tourillonnement du premier rotor entraîné (32) vers le radiateur formé par l'arbre moteur (41).3. Pump according to claim 1 or 2, characterized in that the bearing integrated in the partition (48) comprises at least one self-lubricating ring (54, 54 ') constituting a thermal bridge for the evacuation of the calories generated by the journaling of the first driven rotor (32) to the radiator formed by the drive shaft (41).
4. Pompe selon la revendication 1 ou 2, caractérisée en ce le palier comporte des roulements à aiguilles prenant appui sur l'embout (42).4. Pump according to claim 1 or 2, characterized in that the bearing comprises needle bearings bearing on the end piece (42).
5. Pompe selon la revendication 1 , caractérisée en ce que la cloison (48) est une pièce monobloc réalisée dans un matériau à la fois chimiquement compatible avec le liquide pompé, et possédant une tenue mécanique suffisante pour supporter notamment la pression du liquide pompé.5. Pump according to claim 1, characterized in that the partition (48) is a single piece made of a material both chemically compatible with the pumped liquid, and having sufficient mechanical strength to withstand the pressure of the pumped liquid in particular.
6. Pompe selon la revendication 1 , caractérisée en ce que la cloison (48) est conformée pour la compatibilité chimique, tandis que la précision et la tenue mécanique sont assurées par une pièce additionnelle épousant partiellement la forme de la cloison (48) et réalisée dans un matériau ayant une bonne tenue mécanique.6. Pump according to claim 1, characterized in that the partition (48) is shaped for chemical compatibility, while the precision and mechanical strength are ensured by an additional piece partially matching the shape of the partition (48) and produced in a material with good mechanical strength.
7. Pompe selon la revendication 6, caractérisée en ce que la pièce additionnelle est réalisée en alliage métallique, notamment en acier inoxydable, et comprend une virole (52) s'insérant dans l'entrefer ménagé entre les deux séries d'aimants (31 , 33). 7. Pump according to claim 6, characterized in that the additional part is made of metal alloy, in particular stainless steel, and comprises a ferrule (52) fitting into the air gap formed between the two series of magnets (31 , 33).
8. Pompe selon la revendication 7, caractérisée en ce que l'épaisseur de la virole (52) est inférieure à celle de l'enveloppe de la cloison (48). 8. Pump according to claim 7, characterized in that the thickness of the ferrule (52) is less than that of the envelope of the partition (48).
EP00960799A 1999-09-06 2000-09-06 Magnetically driven pump Expired - Lifetime EP1210520B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9911242 1999-09-06
FR9911242A FR2798169B1 (en) 1999-09-06 1999-09-06 MAGNETIC DRIVE PUMP
PCT/FR2000/002446 WO2001018401A1 (en) 1999-09-06 2000-09-06 Magnetically driven pump

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EP1210520A1 true EP1210520A1 (en) 2002-06-05
EP1210520B1 EP1210520B1 (en) 2003-11-19

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JP (1) JP2003508689A (en)
AT (1) ATE254723T1 (en)
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ES (1) ES2211599T3 (en)
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WO (1) WO2001018401A1 (en)

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ATE254723T1 (en) 2003-12-15
DE60006689T2 (en) 2004-10-07
DE60006689D1 (en) 2003-12-24
US6672818B1 (en) 2004-01-06
WO2001018401A1 (en) 2001-03-15
FR2798169B1 (en) 2001-11-16
EP1210520B1 (en) 2003-11-19
JP2003508689A (en) 2003-03-04
FR2798169A1 (en) 2001-03-09

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