EP0982499A1 - Magnetically coupled centrifugal pump - Google Patents

Magnetically coupled centrifugal pump Download PDF

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Publication number
EP0982499A1
EP0982499A1 EP99114038A EP99114038A EP0982499A1 EP 0982499 A1 EP0982499 A1 EP 0982499A1 EP 99114038 A EP99114038 A EP 99114038A EP 99114038 A EP99114038 A EP 99114038A EP 0982499 A1 EP0982499 A1 EP 0982499A1
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EP
European Patent Office
Prior art keywords
pump
bearing
sleeve
centrifugal pump
pump according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP99114038A
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German (de)
French (fr)
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EP0982499B1 (en
Inventor
Peter Wirz
Thomas Folsche
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CP Pumpen AG
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CP Pumpen AG
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Publication date
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Publication of EP0982499A1 publication Critical patent/EP0982499A1/en
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/04Shafts or bearings, or assemblies thereof
    • F04D29/046Bearings
    • F04D29/047Bearings hydrostatic; hydrodynamic
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00Pumping installations or systems
    • F04D13/02Units comprising pumps and their driving means
    • F04D13/021Units comprising pumps and their driving means containing a coupling
    • F04D13/024Units comprising pumps and their driving means containing a coupling a magnetic coupling
    • F04D13/026Details of the bearings
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/04Shafts or bearings, or assemblies thereof
    • F04D29/046Bearings
    • F04D29/0465Ceramic bearing designs

Definitions

  • the present invention relates to a magnetically coupled centrifugal pump according to the preamble of claim 1.
  • Such a centrifugal pump is for example from EP 0171515 known, in which the pump chamber with it on a stationary Pump impeller overhung by a static axis sealing canned pot is separated from the engine compartment.
  • the drive motor is equipped with a permanent magnet Connected inner rotor, which is close to the engine compartment Wall of the canned pot is arranged.
  • the pump impeller is in turn with an external rotor provided with permanent magnets connected, which is close to the pump-side wall of the canned pot is arranged. It will be a non-contact Transmission of the rotary motion of the drive motor the pump impeller is realized, in which none through shaft seals Leakage problems caused can occur.
  • Such pumps are used in particular for fluid media, which an optimal tightness resp. avoidance of Require leakages, and where no moving or. dynamic Seals are approved, such as at aggressive or toxic media.
  • these are usually included horizontally arranged pump impeller axis, being in the lower Area of the pump room separate, additional drainage connection must be provided. This drainage nozzle but must now be sealed again, with these Places so-called dead spaces can occur in which residues of the medium to be funded, i.e. a complete one Emptying cannot be achieved.
  • the pump described fulfills these additional criteria, however insufficient, especially the intake area is through the conventional use of multi-part, stationary axes and the metallic threaded bushings arranged in the pump impeller with shrinked plain bearing bush not free of dead space, resulting in inadequate cleaning and sterilization of the pump room leads.
  • the object of the present invention was now the described Fix disadvantages and such a pump too create which is particularly suitable for use for sterile Process engineering is suitable.
  • Such a pump designed according to the invention is suitable for use in fluid process engineering and in particular in the field of sterile process engineering.
  • Figure 1 shows the longitudinal section through an inventive Centrifugal pump with drive housing 1, a pump housing 2 and an attached suction flange resp. -Stutzen 3.
  • the drive housing 1 In the drive housing 1 is a permanent magnet rotor on a flywheel 4 5 arranged.
  • a canned pot 6 Between the drive housing 1 and the Pump housing 2 is a canned pot 6, which only over its pot edge 6 'with the drive housing 1 resp. the Pump housing 2 is connected and the drive chamber 1 'from the pump chamber 2 'statically sealing separates.
  • the flywheel 4 is on a shaft 7 with a not shown in the figure Drive motor, for example an electric motor, arranged.
  • a pump impeller 8 is arranged in the pump chamber 2 ' for example, permanent magnets integrated directly into the pump impeller body 9, which has an outer permanent magnet rotor form.
  • the two permanent magnet rotors 5 and 9 are spaced from each other, through the wall of the Canned pot 6 separately, arranged parallel to the pump axis 10.
  • pump blades are formed, which the medium convey to the outer area of the pump chamber 2 'and discharge through a pump outlet 11.
  • the pump impeller 8 is now on a stationary axis of the Pump bearing bracket 12 which is fixed to the pump housing 2 is connected, and its nose in the suction chamber 3 'of Intake 3 opens.
  • the bearing of the pump impeller 8 on the pump bearing bracket 12 is now according to the invention as follows in the form of a plain bearing realized.
  • Sleeve 13 applied as a bearing axis, in the present case by means of a clamping screw 14.
  • the head of the Tensioning screw 14 are sealed by means of O-rings 15.
  • the metal sleeve 17 is preferably made made of a material with high yield strength, good heat resistance, good corrosion resistance and preferably one thermal coefficient of thermal expansion, which is in the range of the thermal expansion coefficient of the bearing bush 16.
  • the Shrinking process resp. the dimensions of the metal sleeve 17th are designed so that they are at least partially plastic is deformed, preferably completely plastically deformed becomes.
  • the wall thickness of the Metal sleeve 17 can advantageously take advantage of the maximum permissible strength values, i.e. the defined plastic Deformation, the pressure set on the bearing bush 16 resp. be limited.
  • the pump impeller 8 provided with the bearing combination can then pushed onto the sleeve 13 of the pump bearing bracket 12 become a flying camp.
  • This storage is now advantageously very compact, which is very good Arrival resp. Flow conditions during the cleaning process, has no dead spaces and is in the area to be pumped Medium arranged so that even when refilling the pump room 2 'no problem due to lack of ventilation in this Area can arise.
  • FIG of the present invention is the pump bearing bracket 12 from one piece at the same time also designed as a bearing axis in the area of the bearing bush 16.
  • This embodiment is compared to the execution simplified once again according to FIG. 1 and is even easier clean and disassemble if necessary.
  • a through hole 18 is formed be, which simplifies the cleaning of the pump room and in operation the pressure equalization between the intake area 3 'and the back of the pump impeller 8 is used.
  • the pump presented here is suitable due to the simple and compact design and avoidance of dead spaces and Columns especially for applications in the field of sterile Process engineering, can of course also for everyone other areas of application.

Abstract

A magnetically coupled rotary pump has, in a pump chamber, a pump rotor mounted by a single slide bearing on a stationary axis of a pump bearing support. The slide bearing is formed on one side by a metal sleeve shrunk over the bearing sleeve, said sleeve being connected by means of a weld with the pump rotor, and on the other side by a bushing mounted on the pump bearing support or a one-piece slide bearing surface formed correspondingly directly on pump bearing support. With this design of the bearing, dead spaces and gaps are avoided, enabling complete cleaning and sterilization of the pump chamber with complete draining of the pump chamber. A pump of this kind is especially suitable for use in sterile applications.

Description

Die vorliegende Erfindung betrifft eine magnetgekuppelte Kreiselpumpe nach dem Oberbegriff von Anspruch 1.The present invention relates to a magnetically coupled centrifugal pump according to the preamble of claim 1.

Eine derartige Kreiselpumpe ist beispielsweise aus EP 0171515 bekannt, bei welcher der Pumpenraum mit darin auf einer stationären Achse fliegend gelagertem Pumpenlaufrad durch einen statisch dichtenden Spaltrohrtopf vom Motorraum getrennt ist. Der Antriebsmotor ist mit einem mit Permanentmagneten bestückten Innenläufer verbunden, welcher dicht an der motorraumseitigen Wandung des Spaltrohrtopfes angeordnet ist. Das Pumpenlaufrad ist seinerseits mit einem mit Permanentmagneten versehenen Aussenläufer verbunden, welcher dicht an der pumpenseitigen Wandung des Spaltrohrtopfes angeordnet ist. Damit wird eine berührungslose Übertragung der Drehbewegung des Antriebsmotors auf das Pumpenlaufrad realisiert, bei welcher keine durch Wellendichtungen verursachte Dichtigkeitsprobleme auftreten können.Such a centrifugal pump is for example from EP 0171515 known, in which the pump chamber with it on a stationary Pump impeller overhung by a static axis sealing canned pot is separated from the engine compartment. The The drive motor is equipped with a permanent magnet Connected inner rotor, which is close to the engine compartment Wall of the canned pot is arranged. The pump impeller is in turn with an external rotor provided with permanent magnets connected, which is close to the pump-side wall of the canned pot is arranged. It will be a non-contact Transmission of the rotary motion of the drive motor the pump impeller is realized, in which none through shaft seals Leakage problems caused can occur.

Derartige Pumpen werden insbesondere für fluide Medien eingesetzt, welche eine optimale Dichtheit resp. Vermeidung von Leckagen verlangen, und bei welchen keine beweglichen resp. dynamischen Dichtungen zugelassen sind, wie beispielsweise bei aggressiven oder toxischen Medien. Um den Pumpenraum derartiger Pumpen entleeren zu können, werden diese üblicherweise mit waagrecht liegender Pumpenlaufradachse angeordnet, wobei im unteren Bereich des Pumpenraumes separate, zusätzliche Entleerungsstutzen vorgesehen sein müssen. Diese Entleerungsstutzen müssen nun aber auch wieder abgedichtet werden, wobei an diesen Stellen sogenannte Toträume auftreten können, in welchen Resten des zu fördernden Mediums liegen bleiben, also eine vollständige Entleerung nicht erreicht werden kann. Wird nun eine derartige Pumpe mit senkrecht liegender Pumpenlaufradachse eingesetzt, so lässt sie sich ohne zusätzliche Entleerungsstutzen entleeren, aber bei der Wiederaufnahme des Betriebes besteht nun das Problem, dass der zwischen der Rückseite des Pumpenlaufrades und dem Spalttopf liegende Raum nicht entlüftet werden kann, da im Spalttopf selbst kein Entlüftungsstutzen angebracht werden kann. Bei mangelnder Entlüftung besteht nun aber die Gefahr, dass die Lager des Pumpenlaufrades, welche durch das zu fördernde Medium geschmiert werden, trockenlaufen und damit das Lager beschädigt wird. Dies ist gerade bei herkömmlichen Pumpen mit tiefen, zylinderförmigen Spalttöpfen der Fall, bei welchen das Pumpenlaufrad mindestens eine Lagerung im Innenbereich des Spalttopfes aufweist, welcher bei dieser senkrechten Betriebsart beim Befüllen nicht ausreichend entlüftet werden kann.Such pumps are used in particular for fluid media, which an optimal tightness resp. avoidance of Require leakages, and where no moving or. dynamic Seals are approved, such as at aggressive or toxic media. To the pump room of such To be able to drain pumps, these are usually included horizontally arranged pump impeller axis, being in the lower Area of the pump room separate, additional drainage connection must be provided. This drainage nozzle but must now be sealed again, with these Places so-called dead spaces can occur in which residues of the medium to be funded, i.e. a complete one Emptying cannot be achieved. Now becomes such Pump with vertical pump impeller axis inserted, so it can be used without additional drainage spouts empty, but exists when the operation is resumed now the problem is that between the back of the pump impeller and space in the containment can not be vented can, since there is no vent connection in the containment can itself can be. If there is insufficient ventilation, there is now the risk that the bearings of the pump impeller, which by the medium to be pumped is lubricated, run dry and so that the bearing is damaged. This is especially the case with conventional ones Pumps with deep, cylindrical containment shells, in which the pump impeller has at least one bearing inside of the containment shell, which is vertical at this Operating mode not adequately vented when filling can be.

Beim Einsatz solcher Pumpen für die sterile Verfahrenstechnik muss diese in eingebauten Zustand einwandfrei gereinigt, rückstandsfrei geleert und sterilisiert werden können. Die eingangs beschriebene Pumpe erfüllt diese zusätzlichen Kriterien allerdings nur ungenügend, insbesondere ist der Ansaugbereich durch den herkömmlichen Einsatz von mehrteiligen, stationären Achsen und die im Pumpenlaufrad angeordneten metallischen Gewindebüchsen mit eingeschrumpfter Gleitlagerbüchse nicht totraumfrei, was zu einer ungenügenden Reinigung und Sterilisation des Pumpenraumes führt.When using such pumps for sterile process engineering must be properly cleaned in the installed state, residue-free can be emptied and sterilized. The beginning The pump described fulfills these additional criteria, however insufficient, especially the intake area is through the conventional use of multi-part, stationary axes and the metallic threaded bushings arranged in the pump impeller with shrinked plain bearing bush not free of dead space, resulting in inadequate cleaning and sterilization of the pump room leads.

Die Aufgabe der vorliegenden Erfindung lag nun darin, die geschilderten Nachteile zu beheben und eine derartige Pumpe zu schaffen, welche sich insbesondere für den Einsatz für die sterile Verfahrenstechnik eignet. The object of the present invention was now the described Fix disadvantages and such a pump too create which is particularly suitable for use for sterile Process engineering is suitable.

Diese Aufgabe wird erfindungsgemäss durch eine Pumpe mit den kennzeichnenden Merkmalen nach Anspruch 1 gelöst.This object is achieved by a pump with the characteristic features solved according to claim 1.

Weitere, bevorzugte Ausführungsformen ergeben sich aus den abhängigen Ansprüchen 2 bis 13.Further preferred embodiments result from the dependent ones Claims 2 to 13.

Durch die erfindungsgemässe Ausbildung der Lagerung des Pumpenlaufrades auf der stationären Achse des Pumpenlaufrades in Form eines einteiligen Gleitlagers, welches ausser dem Lagerspalt keine Spalten resp. Toträume aufweist, in welche das zu fördernde Medium eindringen könnte, kann der kompakte Pumpeninnenraum vollständig entleert, gereinigt und desinfiziert werden. Ueberdies wird das einzige Lager bei Wiederaufnahme des Betriebes sogleich mit dem zu fördernden Medium umspült und kann damit nicht trockenlaufen und beschädigt werden. Auch die übrige Ausbildung sowohl des Lagerbereiches wie des Pumpenlaufrades fördern und unterstützen diese Eigenschaften ebenfalls. Vorteilhafterweise wird damit auch ein sehr kompakter und einfacher Aufbau der Pumpe erreicht, welche sich einfach warten und ggf. reparieren lässt.Due to the inventive design of the bearing of the pump impeller in shape on the stationary axis of the pump impeller a one-piece plain bearing, which apart from the bearing gap no columns respectively Has dead spaces in which to be funded The compact interior of the pump can penetrate medium completely emptied, cleaned and disinfected. In addition, the only warehouse will be when operations are resumed immediately washed with the medium to be pumped and can do not run dry and be damaged. The rest too Training of both the storage area and the pump impeller promote and support these properties as well. Advantageously it also becomes a very compact and simple one Structure of the pump reached, which are easy to maintain and repaired if necessary.

Eine derartige erfindungsgemäss ausgebildete Pumpe eignet sich für den Einsatz in der fluiden Verfahrenstechnik und insbesondere auf dem Gebiet der sterilen Verfahrenstechnik.Such a pump designed according to the invention is suitable for use in fluid process engineering and in particular in the field of sterile process engineering.

Ein Ausführungsbeispiel der vorliegenden Erfindung wird nachstehend anhand von Figuren der beiliegenden Zeichnung noch näher erläutert. Es zeigen

  • Fig. 1 den Längsschnitt durch eine erfindungsgemässe Pumpe mit mehrteiligem, verschraubten Pumpenlagerträger des Pumpenlaufrades; und
  • Fig. 2 den Längsschnitt durch eine erfindungsgemässe Pumpe mit einteiligem Pumpenlagerträger.
  • An embodiment of the present invention is explained in more detail below with reference to figures of the accompanying drawing. Show it
  • 1 shows the longitudinal section through a pump according to the invention with a multi-part, screwed pump bearing support of the pump impeller; and
  • Fig. 2 shows the longitudinal section through an inventive pump with one-piece pump bearing bracket.
  • Figur 1 zeigt den Längsschnitt durch eine erfindungsgemässe Kreiselpumpe mit Antriebsgehäuse 1, einem Pumpengehäuse 2 und einem daran befestigten Ansaugflansch resp. -stutzen 3. Im Antriebsgehäuse 1 ist an einer Schwungscheibe 4 ein Permanentmagnetläufer 5 angeordnet. Zwischen dem Antriebsgehäuse 1 und dem Pumpengehäuse 2 ist ein Spaltrohrtopf 6 angeordnet, welcher nur über seinen Topfrand 6' mit dem Antriebsgehäuse 1 resp. dem Pumpengehäuse 2 verbunden ist und den Antriebsraum 1' vom Pumpenraum 2' statisch dichtend trennt. Die Schwungscheibe 4 ist auf einer Welle 7 mit einem in der Figur nicht dargestellten Antriebsmotor, beispielsweise einem Elektromotor, angeordnet.Figure 1 shows the longitudinal section through an inventive Centrifugal pump with drive housing 1, a pump housing 2 and an attached suction flange resp. -Stutzen 3. In the drive housing 1 is a permanent magnet rotor on a flywheel 4 5 arranged. Between the drive housing 1 and the Pump housing 2 is a canned pot 6, which only over its pot edge 6 'with the drive housing 1 resp. the Pump housing 2 is connected and the drive chamber 1 'from the pump chamber 2 'statically sealing separates. The flywheel 4 is on a shaft 7 with a not shown in the figure Drive motor, for example an electric motor, arranged.

    Im Pumpenraum 2' ist ein Pumpenlaufrad 8 angeordnet, welches beispielsweise direkt im Pumpenlaufradkörper integrierte Permanentmagnete 9 aufweist, welche einen äusseren Permanentmagnetläufer bilden. Die beiden Permanentmagnetläufer 5 und 9 sind einander gegenüberliegend beabstandet, durch die Wandung des Spaltrohrtopfes 6 getrennt, parallel zur Pumpenachse 10 angeordnet. Auf der dem Spaltrohrtopf 6 abgewandten Seite des Pumpenlaufrades 8 sind Pumpenschaufeln ausgebildet, welche das Medium in den äusseren Bereich des Pumpenraumes 2' fördern und über eine Pumpenaustrittsöffnung 11 abführen.A pump impeller 8 is arranged in the pump chamber 2 ' for example, permanent magnets integrated directly into the pump impeller body 9, which has an outer permanent magnet rotor form. The two permanent magnet rotors 5 and 9 are spaced from each other, through the wall of the Canned pot 6 separately, arranged parallel to the pump axis 10. On the side of the pump impeller facing away from the canned pot 6 8 pump blades are formed, which the medium convey to the outer area of the pump chamber 2 'and discharge through a pump outlet 11.

    Das Pumpenlaufrad 8 ist nun auf einer stationären Achse des Pumpenlagerträgers 12 gelagert, welche fest mit dem Pumpengehäuse 2 verbunden ist, und deren Nase in den Ansaugraum 3' des Ansaugstutzens 3 mündet. The pump impeller 8 is now on a stationary axis of the Pump bearing bracket 12 which is fixed to the pump housing 2 is connected, and its nose in the suction chamber 3 'of Intake 3 opens.

    Die Lagerung des Pumpenlaufrades 8 auf dem Pumpenlagerträger 12 ist nun erfindungsgemäss wie folgt in Form eines Gleitlagers realsiert. Auf dem Pumpenlagerträger 12 ist vorzugsweise eine Hülse 13 als Lagerachse aufgebracht, im vorliegenden Fall mittels einer Spannschraube 14. Die Verbindungsflächen zwischen der Hülse 13 und dem Pumpenlagerträger 12 resp. dem Kopf der Spannschraube 14 sind mittels O-Ringen 15 abgedichtet.The bearing of the pump impeller 8 on the pump bearing bracket 12 is now according to the invention as follows in the form of a plain bearing realized. There is preferably one on the pump bearing support 12 Sleeve 13 applied as a bearing axis, in the present case by means of a clamping screw 14. The connecting surfaces between the sleeve 13 and the pump bearing bracket 12 respectively. the head of the Tensioning screw 14 are sealed by means of O-rings 15.

    Auf eine mit dem Pumpenlaufrad 8 zu verbindende Lagerbüchse 16 ist nun eine im Vergleich zur Lagerbüchse 16 dünnwandige Metallhülse 17 aufgeschrumpft. Die Metallhülse 17 besteht vorzugsweise aus einem Material mit hoher Dehngrenze, guter Warmfestigkeit, guter Korrosionsbeständigkeit und vorzugsweise einem thermischen Wärmeausdehnungskoeffizient, welcher im Bereich des Wärmeausdehnungskoeffizienten der Lagerbüchse 16 liegt. Der Aufschrumpfprozess resp. die Dimensionen der Metallhülse 17 sind derart ausgelegt, dass diese mindestens teilweise plastisch verformt wird, vorzugsweise vollständig plastisch verformt wird. Durch diese Metallhülse 17 wird auf die Lagerbüchse 16 eine günstige Spannungsverteilung erzielt, welche keine Spannungsspitzen aufweist. Durch die Wahl der Wandstärke der Metallhülse 17 kann vorteilhafterweise unter Ausnützung der maximal zulässigen Festigkeitswerte, d.h. der definierten plastischen Verformung, die Pressung auf die Lagerbüchse 16 eingestellt resp. limitert werden.On a bearing bush 16 to be connected to the pump impeller 8 is now a thin-walled metal sleeve compared to the bearing bush 16 17 shrunk. The metal sleeve 17 is preferably made made of a material with high yield strength, good heat resistance, good corrosion resistance and preferably one thermal coefficient of thermal expansion, which is in the range of the thermal expansion coefficient of the bearing bush 16. The Shrinking process resp. the dimensions of the metal sleeve 17th are designed so that they are at least partially plastic is deformed, preferably completely plastically deformed becomes. Through this metal sleeve 17 is on the bearing bush 16 achieved a favorable voltage distribution, which none Has voltage peaks. By choosing the wall thickness of the Metal sleeve 17 can advantageously take advantage of the maximum permissible strength values, i.e. the defined plastic Deformation, the pressure set on the bearing bush 16 resp. be limited.

    Die geschilderte Lagerkombination aus Lagerbüchse 16 und Metallhülse 17 kann nun in die hierfür vorgesehene Passung des Pumpenlaufrades 8 eingeschoben werden und mit diesem über eine Verschweissung zwischen Metallhülse 17 und Pumpenlaufrad 8 verbunden werden. Diese Verschweissung dient ebenfalls der Dichtung des Spaltes zwischen der Metallhülse 17 und der Aufnahme des Pumpenlaufrades 8, wodurch in diesem Bereich die Ausbildung von Toträumen vermieden wird. Durch diese Verbindungsart kann das direkte Einschrumpfen der Lagerbüchse 16 in das Pumpenlaufrad vermieden werden, welches bei der vorzugsweisen Verwendung von keramischem Werkstoff oder Hartmetall für die Lagerbüchse 16 nicht durchführbar wäre. Dabei würden nämlich unzulässig hohe Spannungsspitzen beim Einschrumpfprozess erzeugt werden, und beim Betrieb würde die Gefahr bestehen, dass sich bei hoher Temperatur der Presssitz derart reduziert würde, dass in die dadurch gebildete Fuge das zu fördernde Medium eindringen würde. Damit könnte die Pumpe nicht mehr zuverlässig gereinigt und desinfifziert werden.The described bearing combination of bearing bush 16 and metal sleeve 17 can now in the intended fit of the Pump impeller 8 are inserted and with this over a Welding between metal sleeve 17 and pump impeller 8 connected become. This welding also serves as a seal of the gap between the metal sleeve 17 and the receptacle of the pump impeller 8, whereby the training in this area of dead spaces is avoided. With this type of connection the direct shrinking of the bearing bush 16 into the pump impeller to be avoided, which in the preferred use of ceramic material or hard metal for the bearing bush 16 would not be feasible. It would be inadmissibly high Stress peaks are generated during the shrinking process, and during operation there would be a risk that Temperature of the press fit would be reduced so that in the thus formed joint would penetrate the medium to be conveyed. The pump could no longer be reliably cleaned and be disinfected.

    Das mit der Lagerkombination versehene Pumpenlaufrad 8 kann dann auf die Hülse 13 des Pumpenlagerträgers 12 aufgeschoben werden und damit ein fliegendes Lager bilden. Diese Lagerung ist nun vorteilhaft sehr kompakt aufgebaut, was zu sehr guten An- resp. Umströmverhältnissen beim Reinigungsvorgang führt, weist keine Toträume auf und ist im Bereich des zu pumpenden Mediums angeordnet, so dass auch beim Wiederbefüllen des Pumpenraumes 2' kein Problem wegen mangelnder Entlüftung in diesem Bereich entstehen kann.The pump impeller 8 provided with the bearing combination can then pushed onto the sleeve 13 of the pump bearing bracket 12 become a flying camp. This storage is now advantageously very compact, which is very good Arrival resp. Flow conditions during the cleaning process, has no dead spaces and is in the area to be pumped Medium arranged so that even when refilling the pump room 2 'no problem due to lack of ventilation in this Area can arise.

    In Figur 2 ist nun noch eine weitere, bevorzugte Ausführungsform der vorliegenden Erfindung dargestellt. In dieser Ausführungsform ist der Pumpenlagerträger 12 aus einem Stück gleichzeitig auch als Lagerachse im Bereich der Lagerbüchse 16 ausgebildet. Diese Ausführungsform ist im Vergleich zur Ausführung nach Figur 1 noch einmal vereinfacht und lässt sich noch einfacher reinigen und ggf. auch zerlegen. Vorteilhafterweise kann hier im Pumpenlagerträger 12 eine durchgehende Bohrung 18 ausgebildet sein, welche die Reinigung des Pumpenraumes vereinfacht und im Betrieb dem Druckausgleich zwischen dem Ansaugbereich 3' und der Rückseite des Pumpenlaufrades 8 dient.A further preferred embodiment is now shown in FIG of the present invention. In this embodiment is the pump bearing bracket 12 from one piece at the same time also designed as a bearing axis in the area of the bearing bush 16. This embodiment is compared to the execution simplified once again according to FIG. 1 and is even easier clean and disassemble if necessary. Can advantageously here in the pump bearing bracket 12 a through hole 18 is formed be, which simplifies the cleaning of the pump room and in operation the pressure equalization between the intake area 3 'and the back of the pump impeller 8 is used.

    Die hier vorgestellte Pumpe eignet sich aufgrund der einfachen und kompakten Bauweise und der Vermeidung von Toträumen und Spalten insbesondere für Anwendungen im Gebiet der sterilen Verfahrenstechnik, kann selbstverständlich aber auch für alle anderen Anwendungsgebiete eingesetzt werden.The pump presented here is suitable due to the simple and compact design and avoidance of dead spaces and Columns especially for applications in the field of sterile Process engineering, can of course also for everyone other areas of application.

    Claims (13)

    Kreiselpumpe mit einem ihren Pumpenraum (2') antriebsseitig gegen ein gepumptes Medium dichtenden Spaltrohrtopf (6), auf dessen einer Seite ein motorgetriebener Permanentmagnetläufer (5) angeordnet ist und auf dessen anderer Seite ein mit einem Pumpenlaufrad (8) verbundener Permanentmagnetläufer (9) angeordnet ist, wobei der Spaltrohrtopf (6) nur an seinem Topfrand (6') mit den Pumpenteilen (1,2) verbunden ist und das Pumpenlaufrad (8) auf seiner dem Spaltrohrtopf (6) abgewandten Seite im Nabenbereich einem Ansaugkanal (3') zugewandt ist und auf einer stationären Achse eine Pumpenlagerträgers (12), welche im Ansaugkanal (3') angeordnet und fest mit dem Gehäuse (2) der Kreiselpumpe verbunden ist, drehbar gelagert ist, dadurch gekennzeichnet, dass eine Lagerbüchse (16) mittels einer über die Lagerbüchse (16) aufgeschrumpften Hülse (17) aus Metall mit dem Pumpenlaufrad (8) verbunden ist und im Zusammenwirken mit einer auf dem Pumpenlagerträger (12) angeordneten Lagerachse das einzige Lager in Form eines Gleitlagers des Pumpenlaufrades (8) bildet.Centrifugal pump with its pump chamber (2 ') on the drive side against a canned can (6) that seals against a pumped medium, on one side is a motor-driven permanent magnet rotor (5) is arranged and on the other side one with one Pump impeller (8) connected permanent magnet rotor (9) arranged is, the canned pot (6) only at its pot edge (6 ') is connected to the pump parts (1,2) and the pump impeller (8) on its side facing away from the canned pot (6) Side in the hub area facing an intake duct (3 ') and on a stationary axis a pump bearing support (12), which arranged in the intake duct (3 ') and fixed to the housing (2) the centrifugal pump is connected, is rotatably mounted, thereby characterized in that a bearing bush (16) by means of a the bearing sleeve (16) shrunk on sleeve (17) made of metal the pump impeller (8) is connected and in cooperation with a bearing axis arranged on the pump bearing support (12) the only bearing in the form of a slide bearing of the pump impeller (8) forms. Kreiselpumpe nach Anspruch 1, dadurch gekennzeichnet, dass die Hülse (17) eine im Vergleich zur Lagerbüchse (16) mehrfach dünnere Wandstärke aufweist.Centrifugal pump according to claim 1, characterized in that the sleeve (17) one in comparison to the bearing bush (16) several times has thinner wall thickness. Kreiselpumpe nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Hülse (17) aus einem metallischen Material mit hoher Dehngrenze, hoher Warmfestigkeit und guter Korrosionsbeständigkeit gegen Fluide besteht.Centrifugal pump according to claim 1 or 2, characterized in that the sleeve (17) made of a metallic material high yield strength, high heat resistance and good corrosion resistance against fluids. Kreiselpumpe nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Hülse (17) etwa den gleichen Wärmeausdehnungskoeffizienten wie die Lagerbüchse (16) aufweist.Centrifugal pump according to one of claims 1 to 3, characterized in that the sleeve (17) has approximately the same coefficient of thermal expansion as the bearing bush (16). Kreiselpumpe nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die Hülse (17) in der Länge höchstens gleich lang, vorzugsweise aber kürzer, wie die Lagerbüchse (16) ausgebildet ist.Centrifugal pump according to one of claims 1 to 4, characterized in that the sleeve (17) is at most equal in length long, but preferably shorter, like the bearing bush (16) is. Kreiselpumpe nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass die Hülse (17) gleich lang oder länger als die Nabe des Pumpenlaufrades (8) ausgebildet ist, in welche die Hülse eingesetzt ist.Centrifugal pump according to one of claims 1 to 5, characterized in that that the sleeve (17) is the same length or longer than the hub of the pump impeller (8) is formed, in which the Sleeve is inserted. Kreiselpumpe nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass die Hülse (17) mit dem Pumpenlaufrad (8) entlang beider Hülsenränder jeweils mittels einer Schweissung, vorzugsweise einer betreffend Fluiden dichten Schweissung, verbunden ist.Centrifugal pump according to one of claims 1 to 6, characterized in that that the sleeve (17) with the pump impeller (8) along both sleeve edges by welding, preferably a fluid-tight weld is. Kreiselpumpe nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass die Lagerbüchse (16) aus einem keramischen Werkstoff oder Hartmetall besteht.Centrifugal pump according to one of claims 1 to 7, characterized in that the bearing bush (16) from a ceramic Material or hard metal. Kreiselpumpe nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass die Lagerzapfenfläche durch eine konzentrisch auf der stationären Achse des Pumpenlagerträgers (12) angeordneten Büchse (13) gebildet ist. Centrifugal pump according to one of claims 1 to 8, characterized in that the trunnion surface by a concentric on the stationary axis of the pump bearing bracket (12) arranged sleeve (13) is formed. Kreiselpumpe nach Anspruch 9, dadurch gekennzeichnet, dass die Büchse (13) mittels einer Schraube (14) gegen die stationäre Achse des Pumpenlagerträgers (12) verspannt und mittels Dichtmitteln, vorzugsweise O-Ringen (15), dagegen abgedichtet ist.Centrifugal pump according to claim 9, characterized in that the sleeve (13) by means of a screw (14) against the stationary one Axis of the pump bearing bracket (12) clamped and by means of Sealing means, preferably O-rings (15), sealed against it is. Kreiselpumpe nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass die Gleitlagerfläche durch die stationäre Achse des Pumpenlagerträgers (12) selbst gebildet ist, vorzugsweise in einteiliger Bauweise.Centrifugal pump according to one of claims 1 to 8, characterized in that the plain bearing surface through the stationary Axis of the pump bearing bracket (12) itself is formed, preferably in one-piece construction. Kreiselpumpe nach einem der Ansprüche 1 bis 11, dadurch gekennzeichnet, dass die Schaufelböden des Pumpenlaufrades (8), wenigstens im Bereich der Pumpenlaufradnabe, durchgehende Ausnehmungen (8') aufweisen.Centrifugal pump according to one of claims 1 to 11, characterized characterized in that the blade bottoms of the pump impeller (8), continuous recesses at least in the area of the pump impeller hub (8 '). Verwendung einer Kreiselpumpe nach einem der Ansprüche 1 bis 12, dadurch gekennzeichnet, dass im Betrieb die Pumpenlaufradachse senkrecht ausgerichtet angeordnet ist.Use of a centrifugal pump according to one of claims 1 to 12, characterized in that the pump impeller axis during operation is arranged vertically aligned.
    EP99114038A 1998-08-21 1999-07-20 Magnetically coupled centrifugal pump Expired - Lifetime EP0982499B1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    CH172798 1998-08-21
    CH172798 1998-08-21

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    EP0982499A1 true EP0982499A1 (en) 2000-03-01
    EP0982499B1 EP0982499B1 (en) 2005-02-09

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    EP99114038A Expired - Lifetime EP0982499B1 (en) 1998-08-21 1999-07-20 Magnetically coupled centrifugal pump

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    US (1) US6280156B1 (en)
    EP (1) EP0982499B1 (en)
    AT (1) ATE289008T1 (en)
    DE (1) DE59911579D1 (en)

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    Also Published As

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    EP0982499B1 (en) 2005-02-09
    ATE289008T1 (en) 2005-02-15
    US6280156B1 (en) 2001-08-28
    DE59911579D1 (en) 2005-03-17

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