EP0982499B1 - Magnetically coupled centrifugal pump - Google Patents

Magnetically coupled centrifugal pump Download PDF

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Publication number
EP0982499B1
EP0982499B1 EP99114038A EP99114038A EP0982499B1 EP 0982499 B1 EP0982499 B1 EP 0982499B1 EP 99114038 A EP99114038 A EP 99114038A EP 99114038 A EP99114038 A EP 99114038A EP 0982499 B1 EP0982499 B1 EP 0982499B1
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EP
European Patent Office
Prior art keywords
pump
bearing
sleeve
rotary pump
rotor
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.)
Expired - Lifetime
Application number
EP99114038A
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German (de)
French (fr)
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EP0982499A1 (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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    • 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
    • F04D13/026—Details of the bearings
    • 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
    • F04D29/0465—Ceramic 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 or EP 0237868, in which the pump chamber with therein on a stationary Axis floating pump impeller by a static sealing canned pot is separated from the engine compartment.
  • the Drive motor is equipped with a permanent magnet Internal rotor connected, which is close to the engine compartment side Wall of the canned pot is arranged.
  • the pump impeller is in turn with a permanent rotor provided with external rotor connected, which is close to the pump-side wall the canned pot is arranged.
  • Such pumps are used in particular for fluid media, which an optimal tightness resp. avoidance of Leaks require, and in which no movable resp. dynamic Seals are approved, such as at aggressive or toxic media.
  • To the pump room such To be able to empty pumps, they are usually with horizontally disposed Pumpenlaufradachse arranged, wherein in the lower Area of the pump room separate, additional drainage nozzle must be provided. These drainage nozzles But now also have to be sealed again, with these So-called dead spaces can occur in which residues of the medium to be conveyed, ie a complete one Emptying can not be achieved.
  • the described pump fulfills these additional criteria only insufficient, in particular, the intake is through the conventional use of multi-part, stationary axes and arranged in the pump impeller metallic threaded bushes with shrunken plain bearing bush not free of dead space, resulting in insufficient cleaning and sterilization of the pump room leads.
  • the inventive design of the storage of the pump impeller on the stationary axis of the pump impeller in shape a one-piece sliding bearing, which except the bearing gap no columns resp. Has dead spaces, in which the promotional Medium could penetrate, the compact pump interior completely emptied, cleaned and disinfected. Moreover, the only camp will be at resumption of operation immediately washed with the medium to be pumped and can thus Do not run dry and be damaged. The rest, too Training both the storage area as the pump impeller promote and support these properties as well. advantageously, It also becomes a very compact and simple one Construction of the pump reached, which is easy to wait and repair if necessary.
  • Such a pump designed according to the invention is suitable for use in fluid processing technology and in particular in the field of sterile process engineering.
  • FIG. 1 shows the longitudinal section through an inventive device Centrifugal pump with drive housing 1, a pump housing 2 and an attached suction flange resp. -socket 3.
  • drive housing 1 in drive housing 1 is on a flywheel 4 a permanent magnet rotor 5 arranged.
  • a canned pot 6 is arranged, which only over its pot edge 6 'with the drive housing 1 respectively.
  • the Pump housing 2 is connected and the drive chamber 1 'from the pump room 2 'statically sealing separates.
  • the flywheel 4 is on a shaft 7 with a not shown in the figure Drive motor, such as an electric motor arranged.
  • a pump impeller 8 is arranged, which For example, directly in the PumpenraisingradSystem integrated permanent magnets 9, which is an outer permanent magnet rotor form.
  • the two permanent magnet rotor 5 and 9 are spaced from each other by the wall of the Canned pot 6 separated, arranged parallel to the pump axis 10.
  • pump blades are formed which contain the medium in the outer region of the pump chamber 2 'promote and remove via a pump outlet opening 11.
  • the pump impeller 8 is now on a stationary axis of the Pump bearing support 12 mounted, which fixed to the pump housing 2 is connected, and whose nose into the suction chamber 3 'of the Inlet 3 opens.
  • the storage of the pump impeller 8 on the pump bearing support 12th is now according to the invention as follows in the form of a sliding bearing realsiert.
  • On the pump bearing support 12 is preferably a Sleeve 13 applied as a bearing axis, in the present case by means a clamping screw 14.
  • the connecting surfaces between the sleeve 13 and the pump bearing support 12, respectively. the head of the Clamping screw 14 are sealed by means of O-rings 15.
  • the metal sleeve 17 is preferably made of a material with a high yield strength, good heat resistance, good corrosion resistance and preferably one thermal expansion coefficient, which is in the range the thermal expansion coefficient of the bearing bush 16 is located.
  • the dimensions of the metal sleeve 17th are designed so that they 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 stress distribution, which no Has voltage peaks.
  • FIG. 2 shows yet another preferred embodiment of the present invention.
  • the pump bearing support 12 in one piece at the same time Also designed as a bearing axis in the bearing bush 16.
  • This embodiment is compared to the embodiment simplified again after Figure 1 and can be even easier clean and, if necessary, disassemble.
  • a through bore 18 can formed here in the pump bearing support 12, a through bore 18 be, which simplifies the cleaning of the pump room and in operation the pressure equalization between the intake 3 'and the rear of the pump impeller 8 is used.
  • the pump presented here is suitable because of the simple and compact design and the avoidance of dead spaces and Columns especially for applications in the field of sterile Process engineering, of course, but also for all other applications are used.

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 oder EP 0237868 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 or EP 0237868, in which the pump chamber with therein on a stationary Axis floating pump impeller by a static sealing canned pot is separated from the engine compartment. Of the Drive motor is equipped with a permanent magnet Internal rotor connected, which is close to the engine compartment side Wall of the canned pot is arranged. The pump impeller is in turn with a permanent rotor provided with external rotor connected, which is close to the pump-side wall the canned pot is arranged. This will be a non-contact Transmission of the rotary motion of the drive motor realized the pump impeller, in which no by shaft seals caused leakage problems may 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 Leaks require, and in which no movable resp. dynamic Seals are approved, such as at aggressive or toxic media. To the pump room such To be able to empty pumps, they are usually with horizontally disposed Pumpenlaufradachse arranged, wherein in the lower Area of the pump room separate, additional drainage nozzle must be provided. These drainage nozzles But now also have to be sealed again, with these So-called dead spaces can occur in which residues of the medium to be conveyed, ie a complete one Emptying can not be achieved. Will now be such Pump with vertical pump impeller axis used, so it can be without additional drainage nozzle empty, but at the resumption of the operation exists Now the problem is that between the back of the pump impeller and the gap pot lying space can not be vented can, as mounted in the containment shell itself no vent pipe can be. In case of lack of ventilation is now but the risk that the bearing of the pump impeller, which by the medium to be pumped, dry and run so that the bearing is damaged. This is just the case with conventional ones Pumps with deep, cylindrical cans of the case, in which the pump impeller at least one storage in the interior having the split pot, which in this vertical Operating mode during filling not sufficiently vented 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 when installed, residue free emptied and sterilized. The entrance However, the described pump fulfills these additional criteria only insufficient, in particular, the intake is through the conventional use of multi-part, stationary axes and arranged in the pump impeller metallic threaded bushes with shrunken plain bearing bush not free of dead space, resulting in insufficient 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 that described Disadvantages to fix and such a pump too create, which is particularly suitable for use for the sterile Process technology is suitable.

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

Weitere, bevorzugte Ausführungsformen ergeben sich aus den abhängigen Ansprüchen 2 bis 13.Further, preferred embodiments will be apparent from the dependent 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.The inventive design of the storage of the pump impeller on the stationary axis of the pump impeller in shape a one-piece sliding bearing, which except the bearing gap no columns resp. Has dead spaces, in which the promotional Medium could penetrate, the compact pump interior completely emptied, cleaned and disinfected. Moreover, the only camp will be at resumption of operation immediately washed with the medium to be pumped and can thus Do not run dry and be damaged. The rest, too Training both the storage area as the pump impeller promote and support these properties as well. advantageously, It also becomes a very compact and simple one Construction of the pump reached, which is easy to wait and repair 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 processing technology 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 will be explained in more detail with reference to figures of the accompanying drawings. Show it
  • 1 shows the longitudinal section through a pump according to the invention with multi-part, screwed pump bearing carrier of the pump impeller. and
  • 2 shows the longitudinal section through an inventive pump with one-piece pump bearing carrier.

    • 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.FIG. 1 shows the longitudinal section through an inventive device Centrifugal pump with drive housing 1, a pump housing 2 and an attached suction flange resp. -socket 3. in drive housing 1 is on a flywheel 4 a permanent magnet rotor 5 arranged. Between the drive housing 1 and the Pump housing 2, a canned pot 6 is arranged, which only over its pot edge 6 'with the drive housing 1 respectively. the Pump housing 2 is connected and the drive chamber 1 'from the pump room 2 'statically sealing separates. The flywheel 4 is on a shaft 7 with a not shown in the figure Drive motor, such as 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.In the pump chamber 2 ', a pump impeller 8 is arranged, which For example, directly in the Pumpenlaufradkörper integrated permanent magnets 9, which is an outer permanent magnet rotor form. The two permanent magnet rotor 5 and 9 are spaced from each other by the wall of the Canned pot 6 separated, arranged parallel to the pump axis 10. On the side facing away from the canned pot 6 of the pump impeller 8, pump blades are formed which contain the medium in the outer region of the pump chamber 2 'promote and remove via a pump outlet opening 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 support 12 mounted, which fixed to the pump housing 2 is connected, and whose nose into the suction chamber 3 'of the Inlet 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 storage of the pump impeller 8 on the pump bearing support 12th is now according to the invention as follows in the form of a sliding bearing realsiert. On the pump bearing support 12 is preferably a Sleeve 13 applied as a bearing axis, in the present case by means a clamping screw 14. The connecting surfaces between the sleeve 13 and the pump bearing support 12, respectively. the head of the Clamping 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 to be connected to the pump impeller 8 bearing bushing 16 is now a compared to the bearing bush 16 thin-walled metal sleeve 17 shrunk. The metal sleeve 17 is preferably made of a material with a high yield strength, good heat resistance, good corrosion resistance and preferably one thermal expansion coefficient, which is in the range the thermal expansion coefficient of the bearing bush 16 is located. Of the Shrinking process resp. the dimensions of the metal sleeve 17th are designed so that they 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 stress distribution, which no Has voltage peaks. By choosing the wall thickness of Metal sleeve 17 can advantageously by utilizing the maximum permissible strength values, i. the defined plastic Deformation, the pressure on the bearing bush 16 set respectively. 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 appropriate 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 the seal the gap between the metal sleeve 17 and the receptacle the pump impeller 8, thereby forming in this area of dead spaces is avoided. Through this connection type can the direct shrinking of the bearing bush 16 in the pump impeller avoided, which in the preferred use of ceramic material or hard metal for the bearing bush 16 would not be feasible. This would be inadmissible high Stress peaks are generated during Einschrumpfprozess, and In operation, there would be a risk that at high Temperature of the press fit would be reduced so that in the thus formed joint would penetrate the medium to be delivered. Thus, the pump could not be cleaned reliably 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 provided with the bearing combination pump impeller 8 can then pushed onto the sleeve 13 of the pump bearing support 12 and thus form a flying camp. This storage is now advantageous very compact, which is very good Resp. Umströmverhältnissen the cleaning process leads, has no dead spaces and is in the area of pumping Mediums 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.FIG. 2 shows yet another preferred embodiment of the present invention. In this embodiment is the pump bearing support 12 in one piece at the same time Also designed as a bearing axis in the bearing bush 16. This embodiment is compared to the embodiment simplified again after Figure 1 and can be even easier clean and, if necessary, disassemble. Advantageously, can formed here in the pump bearing support 12, a through bore 18 be, which simplifies the cleaning of the pump room and in operation the pressure equalization between the intake 3 'and the rear 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 because of the simple and compact design and the avoidance of dead spaces and Columns especially for applications in the field of sterile Process engineering, of course, but also for all other applications are used.

    Claims (13)

    1. Rotary pump, comprising a can motor housing (6) sealing its pump chamber (2') on a drive side from a pumped medium, a first motor-driven permanent magnet rotor (5) being located on one side of the can motor housing and a second permanent magnet rotor (9), connected to a pump rotor (8), being located on the other side, the can motor housing (6) being connected only at an edge area (6') with pump parts (1, 2) , the pump rotor (8), on a side facing away from the can motor housing (6) in a hub area facing an intake channel (3'), being rotatably mounted on a fixed axis of a pump bearing support (12), which support is located in an intake channel (3') and is permanently connected to the housing (2) of the rotary pump, characterised in that a bearing bushing (16) is connected to the pump rotor (8) via a sleeve (17), said sleeve being made of metal shrunk over the bearing bushing (16) and, in cooperation with a bearing axis located on the pump bearing support (12), forms one single slide bearing of the pump rotor (8).
    2. Rotary pump according claim 1, characterised in that the sleeve (17) has a wall thickness that is several times thinner by comparison with the bearing bushing (16).
    3. Rotary pump according to either claim1 or claim 2, characterised in that the sleeve (17) comprises a metal material with a high proof stress, high heat strength, and good resistance to corrosion by fluids.
    4. Rotary pump according to any one of claims 1 to 3, characterised in that the sleeve (17) has approximately the same thermal expansion coefficient as the bearing bushing (16).
    5. Rotary pump according to any one of claims 1 to 4, characterised in that the sleeve (17) is constructed with a length that is at most equal to, but preferably shorter than, the bearing bushing (16).
    6. Rotary pump according to any one of claims 1 to 5, characterised in that the sleeve (17) is constructed with a length that is equal to or longer than the hub of the pump rotor (8) in which the sleeve is inserted.
    7. Rotary pump according to any one of claims 1 to 6, characterised in that the sleeve (17) is connected to the pump rotor (8) along both sleeve edges by a weld in each case, preferably a fluid-tight weld.
    8. Rotary pump according to any one of claims 1 to 7, characterised in that bearing bushing (16) is made of a ceramic material or hard metal.
    9. Rotary pump according to any one of claims 1 to 8, characterised in that the bearing pin surface is formed by a bushing (13) located concentrically on the stationary axis of the pump bearing support (12).
    10. Rotary pump according to claim 9, characterised in that the bushing (13) is tensioned via a screw (14) against the stationary axis of the pump bearing support (12) and is sealed-off therefrom by seals, preferably O-rings (15).
    11. Rotary pump according to any one of claims 1 to 8, characterised in that the slide bearing surface is formed by the stationary axis of the pump bearing support (12) itself, preferably in a one-piece construction.
    12. Rotary pump according to claim and one of claims 1 to 11, characterised in that the bottoms of blades of the pump rotor (8), at least in a vicinity of the pump rotor hub, have through openings (8').
    13. Use of a rotary pump according to any one of claims 1 to 12, characterised in that the pump rotor axis is aligned vertically during operation.
    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

    Publications (2)

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

    Family

    ID=4217197

    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP99114038A Expired - Lifetime EP0982499B1 (en) 1998-08-21 1999-07-20 Magnetically coupled centrifugal pump

    Country Status (4)

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

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    RU2534195C2 (en) * 2011-11-03 2014-11-27 Ассома Инк. Magnetic drive pump

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    EP1716338B1 (en) * 2004-11-23 2007-07-11 ebm-papst St. Georgen GmbH & Co. KG Arrangement for conveying fluids
    EP2699299B1 (en) 2011-04-18 2023-05-31 ResMed Motor Technologies Inc Pap system blower
    DE102011086460A1 (en) * 2011-11-16 2013-05-16 Robert Bosch Gmbh Liquid pump with axial thrust washer
    EP2610498B1 (en) * 2011-12-27 2016-11-16 Grundfos Holding A/S Pump power unit
    US8905729B2 (en) 2011-12-30 2014-12-09 Peopleflo Manufacturing, Inc. Rotodynamic pump with electro-magnet coupling inside the impeller
    US8905728B2 (en) 2011-12-30 2014-12-09 Peopleflo Manufacturing, Inc. Rotodynamic pump with permanent magnet coupling inside the impeller
    DE102013008795B3 (en) * 2013-05-24 2014-08-21 Ksb Aktiengesellschaft pump assembly
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    CA3041837C (en) * 2016-11-01 2021-08-10 Psg Worldwide, Inc. Magnetically coupled sealless centrifugal pump

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    Also Published As

    Publication number Publication date
    EP0982499A1 (en) 2000-03-01
    DE59911579D1 (en) 2005-03-17
    ATE289008T1 (en) 2005-02-15
    US6280156B1 (en) 2001-08-28

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