EP0664400A1 - Magnetic drive pump - Google Patents

Magnetic drive pump Download PDF

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Publication number
EP0664400A1
EP0664400A1 EP94118999A EP94118999A EP0664400A1 EP 0664400 A1 EP0664400 A1 EP 0664400A1 EP 94118999 A EP94118999 A EP 94118999A EP 94118999 A EP94118999 A EP 94118999A EP 0664400 A1 EP0664400 A1 EP 0664400A1
Authority
EP
European Patent Office
Prior art keywords
impeller
pump
bearing surface
rotor
magnet
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
EP94118999A
Other languages
German (de)
French (fr)
Other versions
EP0664400B1 (en
Inventor
Stefan C/O Munsch Kunststoff- Munsch
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.)
Munsch Kuststoff-Schweisstechnik GmbH
Original Assignee
Munsch Kuststoff-Schweisstechnik GmbH
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Publication of EP0664400A1 publication Critical patent/EP0664400A1/en
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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
    • F04D13/026—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
    • F04D29/041—Axial thrust balancing
    • F04D29/0413—Axial thrust balancing hydrostatic; hydrodynamic thrust 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
    • F04D29/043—Shafts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/04—Shafts or bearings, or assemblies thereof
    • F04D29/046—Bearings
    • F04D29/0465—Ceramic bearing designs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2203/00—Non-metallic inorganic materials
    • F05C2203/08—Ceramics; Oxides
    • F05C2203/0804—Non-oxide ceramics
    • F05C2203/0813—Carbides

Definitions

  • the invention relates to a magnetic pump for corrosive media, with a motor-driven drive motor arranged on the outer circumference of a containment shell, with a arranged inside the containment shell, which can be taken by the drive motor during rotation and is magnetically coupled with this and one at one end rotatably with the magnet rotor and at its other end, a pump shaft connected in a rotationally fixed manner, which is mounted radially in a pump back part in two sliding bearing bushings made of silicon carbide, the surfaces of the containment shell, the pump back part, the impeller and the magnet rotor which delimit the inside of the pump being made of plastic.
  • Impeller and magnet rotor usually have injected or coated metal bushings for torque transmission. These have to be sealed with aggressive elements against the aggressive media.
  • the invention has for its object to further develop the generic magnetic pump in such a way that the corrosion resistance against aggressive media is further improved with a simplified structure.
  • the pump shaft consists of hard ceramic; that the slide bearing bushing adjacent to the impeller for the pump shaft has a first exposed annular end bearing surface facing the impeller; that the slide bearing bushing adjacent to the magnetic rotor for the pump shaft has a second exposed annular end bearing surface facing the magnetic rotor; that an impeller bush made of hard ceramic is connected to the impeller in a rotationally fixed manner and has an exposed first axial bearing surface facing the first end bearing surface; and that a magnet rotor made of hard ceramic is connected in a rotationally fixed manner to the magnet rotor and has an exposed second axial bearing surface facing the second end bearing surface.
  • the impeller bush is potted with the impeller.
  • the invention also proposes that the magnet rotor bushing be encapsulated with the magnet rotor.
  • the invention also provides that silicon carbide is at least partially provided as the hard ceramic.
  • the invention is based on the surprising finding that it is possible to significantly improve the corrosion resistance of magnetic pumps of the generic type with a simple structure by producing the pump shaft, the impeller bushing and the magnetic rotor bushing from hard ceramic, preferably from silicon carbide, the construction being carried out in this way is that the plain bearing bushes, also made of silicon carbide, together with the impeller bushing and the magnetic rotor bushing simultaneously fulfill the function of the axial bearing for the pump shaft.
  • the drawing consists of a single figure an embodiment of a magnetic pump according to the invention in axial longitudinal section.
  • the magnetic pump according to the invention in the exemplary embodiment shown there has a drive rotor 12 seated on a motor journal 10 provided with a drive motor (not shown), which carries a drive magnet ring 16 arranged on the outer circumference of a containment shell 14, made of plastic material.
  • a magnet rotor 18 is rotatably mounted in the interior of the can 14, the magnet rotor ring 20 of the magnet rotor being magnetically coupled to the drive ring 16 of the drive rotor 12 via the wall of the can.
  • a magnetic rotor sleeve 22 made of silicon carbide is integrated in a rotationally fixed manner into the plastic mass of the magnetic rotor 18, which is made entirely of corrosion-resistant plastic material, and has a free circular axial bearing surface 24 lying in the end face of the magnetic rotor 18 pointing to the left in the drawing.
  • the magnetic rotor bushing 22 is positively connected to a pump shaft 26 made of silicon carbide via a polygonal profile, which enables perfect torque transmission.
  • the pump shaft 26 is rotatably mounted in two plain bearing bushes 28, 30 which are arranged in the pump housing in such a way that they each form an annular, exposed end bearing surface 32, 34.
  • an impeller bush 36 With the end of the pump shaft 26 facing away from the magnet rotor 18, an impeller bush 36 is rotationally fixed in a manner suitable for torque transmission via a polygon profile PC 4 connected, which is poured into the plastic mass of an impeller 38.
  • the impeller bushing 36 also consists of silicon carbide and has an annular axial bearing surface 40 which faces the end bearing surface 34 of the plain bearing bushing 28.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Ceramic Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Sliding-Contact Bearings (AREA)
  • Valve Device For Special Equipments (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)
  • Magnetically Actuated Valves (AREA)

Abstract

The magnet-operated pump is suitable for use with corrosive media. It has a pump shaft (26) made of hard ceramic material. Its journal bush (28) adjacent to the impeller (38) has a first free ring-shaped end bearing face (34) facing the impeller. The pump shaft bearing (30) adjacent to the magnet-rotor (18) has a second end face bearing surface (32). An impeller bush (36) fixed to the impeller is also made of hard ceramic material, and has a first axial bearing face (40) pointing towards one of the first end bearing faces (34). A hard ceramic bush (22) is fixed to the magnet-rotor, having a free second axial bearing face (24) facing the second end bearing face.

Description

Die Erfindung betrifft eine Magnetpumpe für korrosive Medien, mit einem motorbetriebenen, am Außenumfang eines Spalttopfes angeordneten Antriebsmotor, einem innerhalb des Spalttopfs angeordneten, von dem Antriebsmotor bei der Rotation mitnehmbaren und mit diesem magnetisch gekuppelten Magnetrotor und einer an ihrem einen Ende drehfest mit dem Magnetrotor und an ihrem anderen Ende drehfest mit einem Laufrad verbundenen Pumpenwelle, die in einem Pumpenrückteil in zwei Gleitlagerbuchsen aus Siliciumcarbid radial gelagert ist, wobei die das Pumpeninnere begrenzenden Flächen des Spalttopfes, des Pumpenrückteiles, des Laufrades und des Magnetrotors aus Kunststoff bestehen.The invention relates to a magnetic pump for corrosive media, with a motor-driven drive motor arranged on the outer circumference of a containment shell, with a arranged inside the containment shell, which can be taken by the drive motor during rotation and is magnetically coupled with this and one at one end rotatably with the magnet rotor and at its other end, a pump shaft connected in a rotationally fixed manner, which is mounted radially in a pump back part in two sliding bearing bushings made of silicon carbide, the surfaces of the containment shell, the pump back part, the impeller and the magnet rotor which delimit the inside of the pump being made of plastic.

Bei derartigen Magnetpumpen ist es notwendig, die aus dem Magnetrotor, der Pumpenwelle und dem Laufrad bestehende Dreheinheit im Pumpengehäuse sowohl radial als auch axial zu lagern.With such magnetic pumps, it is necessary that from the Magnet rotor, the pump shaft and the impeller rotating unit in the pump housing both radially and axially.

Bislang ist es üblich, die Pumpenwelle derartiger Magnetpumpen für hochkorrosive Medien, wie sie insbesondere in der chemischen Industrie verwendet werden, aus Stahl zu fertigen und dann zum Schutz gegen die aggressiven Medien mit Kunststoff zu ummanteln. Laufrad und Magnetrotor haben üblicherweise eingespritzte oder ummantelte Metallbuchsen zur Drehmomentübertragung. Diese müssen aufwendig mit Dichtelementen gegen die aggressiven Medien abgedichtet werden.So far, it has been customary to manufacture the pump shaft of such magnetic pumps for highly corrosive media, such as those used in particular in the chemical industry, from steel and then to sheath them with plastic to protect them against the aggressive media. Impeller and magnet rotor usually have injected or coated metal bushings for torque transmission. These have to be sealed with aggressive elements against the aggressive media.

Der Erfindung liegt die Aufgabe zugrunde, die gattungsgemäße Magnetpumpe dahingehend weiterzubilden, daß bei vereinfachtem Aufbau die Korrosionsbeständigkeit gegen aggressive Medien weiter verbessert wird.The invention has for its object to further develop the generic magnetic pump in such a way that the corrosion resistance against aggressive media is further improved with a simplified structure.

Erfindungsgemäß wird diese Aufgabe dadurch gelöst, daß die Pumpenwelle aus Hartkeramik besteht; daß die dem Lauf- rad benachbarte Gleitlagerbuchse für die Pumpenwelle eine dem Laufrad zugewandte erste freiliegende kreisringförmige Stirnlagerfläche aufweist; daß die dem Magnetrotor benachbarte Gleitlagerbuchse für die Pumpenwelle eine dem Magnetrotor zugewandte zweite freiliegende kreisringförmige Stirnlagerfläche aufweist; daß mit dem Laufrad drehfest eine Laufradbuchse aus Hartkeramik verbunden ist, die eine der ersten Stirnlagerfläche zugewandte freiliegende erste Axiallagerfläche aufweist; und daß mit dem Magnetrotor drehfest eine Magnetrotorbuchse aus Hartkeramik verbunden ist, die eine der zweiten Stirnlagerfläche zugewandte freiliegende zweite Axiallagerfläche aufweist.According to the invention, this object is achieved in that the pump shaft consists of hard ceramic; that the slide bearing bushing adjacent to the impeller for the pump shaft has a first exposed annular end bearing surface facing the impeller; that the slide bearing bushing adjacent to the magnetic rotor for the pump shaft has a second exposed annular end bearing surface facing the magnetic rotor; that an impeller bush made of hard ceramic is connected to the impeller in a rotationally fixed manner and has an exposed first axial bearing surface facing the first end bearing surface; and that a magnet rotor made of hard ceramic is connected in a rotationally fixed manner to the magnet rotor and has an exposed second axial bearing surface facing the second end bearing surface.

Dabei kann vorgesehen sein, daß die Laufradbuchse mit dem Laufrad vergossen ist.It can be provided that the impeller bush is potted with the impeller.

Die Erfindung schlagt auch vor, daß die Magnetrotorbuchse mit dem Magnetrotor vergossen ist.The invention also proposes that the magnet rotor bushing be encapsulated with the magnet rotor.

Auch sieht die Erfindung vor, daß als Hartkeramik zumindest teilweise Siliciumcarbid vorgesehen ist.The invention also provides that silicon carbide is at least partially provided as the hard ceramic.

Der Erfindung liegt die überraschende Erkenntnis zugrunde, daß es gelingt, bei einfachem Aufbau die Korrosionsbeständigkeit von Magnetpumpen der gattungsgemäßen Art deutlich zu verbessern, indem die Pumpenwelle, die Laufradbuchse und die Magnetrotorbuchse aus Hartkeramik, vorzugsweise aus Siliciumcarbid, gefertigt werden, wobei die Konstruktion so ausgeführt ist, daß die Gleitlagerbuchsen, ebenfalls aus Siliciumcarbid bestehen, zusammen mit der Laufradbuchse und der Magnetrotorbuchse gleichzeitig die Funktion der Axiallagerung für die Pumpenwelle erfüllen.The invention is based on the surprising finding that it is possible to significantly improve the corrosion resistance of magnetic pumps of the generic type with a simple structure by producing the pump shaft, the impeller bushing and the magnetic rotor bushing from hard ceramic, preferably from silicon carbide, the construction being carried out in this way is that the plain bearing bushes, also made of silicon carbide, together with the impeller bushing and the magnetic rotor bushing simultaneously fulfill the function of the axial bearing for the pump shaft.

Hierdurch ergibt sich der wesentliche Vorteil, daß im Pumpeninneren kein Metallteil vorhanden und damit ein Versagen der Pumpe gegenüber Korrosion so gut wie unmöglich ist. Die Einfachheit der Konstruktion gegenüber herkömmlichen Lösungen springt ebenfalls ins Auge.This results in the significant advantage that there is no metal part inside the pump, making failure of the pump against corrosion virtually impossible. The simplicity of the design compared to conventional solutions also catches the eye.

Weitere Merkmale und Vorteile der Erfindung ergeben sich aus den Ansprüchen und aus der nachstehenden Beschreibung, in der ein Ausführungsbeispiel anhand der schematischen Zeichnung im einzelnen erläutert ist.Further features and advantages of the invention result from the claims and from the following description, in which an exemplary embodiment is explained in detail with reference to the schematic drawing.

Dabei zeigt die aus einer einzigen Figur bestehende Zeichnung ein Ausführungsbeispiel einer Magnetpumpe nach der Erfindung im axialen Längsschnitt.The drawing consists of a single figure an embodiment of a magnetic pump according to the invention in axial longitudinal section.

Wie die Zeichnung erkennen läßt, weist die Magnetpumpe nach der Erfindung bei dem dort gezeigten Ausführungsbeispiel einen auf einem mit einem nicht gezeigten Antriebsmotor versehenen Motorzapfen 10 sitzenden Antriebsrotor 12 auf, der einen am Außenumfang eines Spalttopfes 14, aus Kunststoffmaterial bestehend, angeordneten Antriebsmagnetkranz 16 trägt. Im Inneren des Spalttopfes 14 ist ein Magnetrotor 18 drehbar gelagert, dessen Magnetrotormagnetkranz 20 über die Wandung des Spalttopfes mit dem Antriebsmagnetkranz 16 des Antriebsrotors 12 magnetisch gekuppelt ist.As can be seen in the drawing, the magnetic pump according to the invention in the exemplary embodiment shown there has a drive rotor 12 seated on a motor journal 10 provided with a drive motor (not shown), which carries a drive magnet ring 16 arranged on the outer circumference of a containment shell 14, made of plastic material. A magnet rotor 18 is rotatably mounted in the interior of the can 14, the magnet rotor ring 20 of the magnet rotor being magnetically coupled to the drive ring 16 of the drive rotor 12 via the wall of the can.

In die Kunststoffmasse des an seiner Außenfläche vollständig aus korrosionsfestem Kunststoffmaterial bestehenden Magnetrotors 18 ist drehfest eine Magnetrotorbuchse 22 aus Siliciumcarbid integriert, die eine in der in der Zeichnung nach links weisenden Stirnfläche des Magnetrotors 18 liegende freie kreisringförmige Axiallagerfläche 24 aufweist. Die Magnetrotorbuchse 22 ist formschlüssig über ein Polygonprofil, welches eine einwandfreie Drehmomentübertragung ermöglicht, mit einer Pumpenwelle 26 aus Siliciumcarbid verbunden. Die Pumpenwelle 26 ist in zwei Gleitlagerbuchsen 28, 30 drehbar gelagert, die im Pumpengehäuse derart angeordnet sind, daß sie jeweils eine kreisringförmige, freiliegende Stirnlagerfläche 32, 34 bilden.A magnetic rotor sleeve 22 made of silicon carbide is integrated in a rotationally fixed manner into the plastic mass of the magnetic rotor 18, which is made entirely of corrosion-resistant plastic material, and has a free circular axial bearing surface 24 lying in the end face of the magnetic rotor 18 pointing to the left in the drawing. The magnetic rotor bushing 22 is positively connected to a pump shaft 26 made of silicon carbide via a polygonal profile, which enables perfect torque transmission. The pump shaft 26 is rotatably mounted in two plain bearing bushes 28, 30 which are arranged in the pump housing in such a way that they each form an annular, exposed end bearing surface 32, 34.

Mit dem dem Magnetrotor 18 abgewandten Ende der Pumpenwelle 26 ist über ein Polygonprofil PC 4 eine Laufradbuchse 36 in zur Drehmomentübertragung geeigneter Weise drehfest verbunden, die in die Kunststoffmasse eines Laufrades 38 eingegossen ist. Die Laufradbuchse 36 besteht ebenfalls aus Siliciumcarbid und weist eine kreisringförmige Axiallagerfläche 40 auf, die der Stirnlagerfläche 34 der Gleitlagerbuchse 28 zugewandt ist.With the end of the pump shaft 26 facing away from the magnet rotor 18, an impeller bush 36 is rotationally fixed in a manner suitable for torque transmission via a polygon profile PC 4 connected, which is poured into the plastic mass of an impeller 38. The impeller bushing 36 also consists of silicon carbide and has an annular axial bearing surface 40 which faces the end bearing surface 34 of the plain bearing bushing 28.

Durch das Zusammenwirken der Stirnlagerflächen 32, 34 der pumpengehäusefesten Gleitlagerbuchsen 30, 28 mit den Axiallagerflächen 24, 40 der Magnetrotorbuchse 22 bzw. der Laufradbuchse 36 werden die ansonsten üblichen Axiallager überflüssig, indem nämlich die Pumpenwelle 26 durch reinen Kontakt der vorgenannten Axiallagerflächen mit den vorgenannten Stirnlagerflächen auf Siliciumcarbid-Siliciumcarbid-Basis axial gelagert ist. Auch die radiale Lagerung der Pumpenwelle 26 ist durch einen reinen SiliciumcarbidSiliciumcarbid-Kontakt, nämlich zwischen der Pumpenwelle 26 selbst und den Gleitlagerbuchsen 28, 30, gewährleistet, so daß alle Lagerfunktionen durch korrosionsfeste und wartungsfreie Siliciumcarbid-Siliciumcarbid-Kontakte bewerkstelligt sind. Da das Innere des Pumpengehäuses, das Laufrad 38 und der Magnetrotor 18 sämtlich aus korrosionsfestem Kunststoffmaterial bestehen, können mit dem aggressiven, zu pumpenden Medium ausschließlich Flächen aus Siliciumcarbid oder Kunststoff in Berührung kommen. Hierdurch ergibt sich eine hohe Betriebssicherheit.The interaction of the end bearing surfaces 32, 34 of the slide bearing bushes 30, 28 fixed to the pump housing with the axial bearing surfaces 24, 40 of the magnetic rotor bushing 22 and the impeller bushing 36 make the otherwise customary axial bearings superfluous, namely because the pump shaft 26 is caused by pure contact of the abovementioned axial bearing surfaces with the abovementioned end bearing surfaces is axially supported on a silicon carbide-silicon carbide basis. The radial mounting of the pump shaft 26 is ensured by a pure silicon carbide-silicon carbide contact, namely between the pump shaft 26 itself and the slide bearing bushes 28, 30, so that all bearing functions are carried out by corrosion-resistant and maintenance-free silicon carbide-silicon carbide contacts. Since the inside of the pump housing, the impeller 38 and the magnet rotor 18 are all made of corrosion-resistant plastic material, only surfaces made of silicon carbide or plastic can come into contact with the aggressive medium to be pumped. This results in high operational reliability.

Die in der vorstehenden Beschreibung, in der Zeichnung sowie in den Ansprüchen offenbarten Merkmale der Erfindung können sowohl einzeln als auch in beliebiger Kombination für die Verwirklichung der Erfindung in ihren verschiedenen Ausführungsformen wesentlich sein.The features of the invention disclosed in the above description, in the drawing and in the claims can be essential both individually and in any combination for realizing the invention in its various embodiments.

BEZUGSZEICHENLISTEREFERENCE SIGN LIST

1010th
MotorzapfenEngine journal
1212th
AntriebsrotorDrive rotor
1414
SpalttopfContainment shell
1616
AntriebsmagnetkranzMagnetic drive ring
1818th
MagnetrotorMagnet rotor
2020th
MagnetrotormagnetkranzMagnet rotor magnet ring
2222
MagnetrotorbuchseMagnet rotor socket
2424th
AxiallagerflächeAxial bearing surface
2626
PumpenwellePump shaft
2828
GleitlagerbuchsePlain bearing bush
3030th
GleitlagerbuchsePlain bearing bush
3232
StirnlagerflächeEnd bearing surface
3434
StirnlagerflächeEnd bearing surface
3636
LaufradbuchseImpeller bushing
3838
LaufradWheel
4040
AxiallagerflächeAxial bearing surface

Claims (4)

Magnetpumpe für korrosive Medien, mit einem motorbetriebenen, am Außenumfang eines Spalttopfes angeordneten Antriebsmotor, einem innerhalb des Spalttopfs angeordneten, von dem Antriebsmotor bei der Rotation mitnehmbaren und mit diesem magnetisch gekuppelten Magnetrotor und einer an ihrem einen Ende drehfest mit dem Magnetrotor und an ihrem anderen Ende drehfest mit einem Laufrad verbundenen Pumpenwelle, die in einem Pumpenrückteil in zwei Gleitlagerbuchsen aus Siliciumcarbid radial gelagert ist, wobei die das Pumpeninnere begrenzenden Flächen des Spalttopfes, des Pumpenrückteiles, des Laufrades und des Magnetrotors aus Kunststoff bestehen, dadurch gekennzeichnet, daß die Pumpenwelle (26) aus Hartkeramik besteht; daß die dem Laufrad (38) benachbarte Gleitlagerbuchse (28) für die Pumpenwelle (26) eine dem Laufrad (38) zugewandte erste freiliegende kreisringförmige Stirnlagerfläche (34) aufweist; daß die dem Magnetrotor (18) benachbarte Gleitlagerbuchse (30) für die Pumpenwelle (26) eine dem Magnetrotor (18) zugewandte zweite freiliegende kreisringförmige Stirnlagerfläche (32) aufweist; daß mit dem Laufrad (38) drehfest eine Laufradbuchse (36) aus Hartkeramik verbunden ist, die eine der ersten Stirnlagerfläche (34) zugewandte freiliegende erste Axiallagerfläche (40) aufweist; und daß mit dem Magnetrotor drehfest eine Magnetrotorbuchse (22) aus Hartkeramik verbunden ist, die eine der zweiten Stirnlagerfläche (32) zugewandte freiliegende zweite Axiallagerfläche (24) aufweist.Magnetic pump for corrosive media, with a motor-driven drive motor arranged on the outer circumference of a containment shell, a inside the containment shell, which can be rotated by the drive motor during rotation and is magnetically coupled with this, and one at one end rotatably with the magnet rotor and at its other end Pump shaft non-rotatably connected to an impeller, which is mounted radially in a pump rear part in two slide bearing bushings made of silicon carbide, the surfaces of the containment shell, the pump back part, the impeller and the magnetic rotor delimiting the pump interior being made of plastic, characterized in that the pump shaft (26) consists of hard ceramic; that the impeller (38) adjacent slide bearing bushing (28) for the pump shaft (26) facing the impeller (38) has a first exposed annular end bearing surface (34); in that the slide bearing bush (30) adjacent to the magnet rotor (18) for the pump shaft (26) has a second exposed annular end bearing surface (32) facing the magnet rotor (18); that an impeller bush (36) made of hard ceramic is connected to the impeller (38) in a rotationally fixed manner and has an exposed first axial bearing surface (40) facing the first end bearing surface (34); and that a magnetic rotor sleeve (22) made of hard ceramic is connected to the magnetic rotor in a rotationally fixed manner and has an exposed second axial bearing surface (24) facing the second end bearing surface (32). Magnetpumpe nach Anspruch 1, dadurch gekennzeichnet, daß die Laufradbuchse (36) mit dem Laufrad (38) vergossen ist.Magnet pump according to claim 1, characterized in that the impeller bushing (36) is cast with the impeller (38). Magnetpumpe nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Magnetrotorbuchse (22) mit dem Magnetrotor (18) vergossen ist.Magnet pump according to claim 1 or 2, characterized in that the magnet rotor bushing (22) is cast with the magnet rotor (18). Magnetpumpe nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß als Hartkeramik zumindest teilweise Siliciumcarbid vorgesehen ist.Magnetic pump according to one of the preceding claims, characterized in that silicon carbide is at least partially provided as the hard ceramic.
EP94118999A 1993-12-22 1994-12-01 Magnetic drive pump Expired - Lifetime EP0664400B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4343854 1993-12-22
DE4343854A DE4343854C2 (en) 1993-12-22 1993-12-22 Magnetic pump
US08/488,910 US5580216A (en) 1993-12-22 1995-06-09 Magnetic pump

Publications (2)

Publication Number Publication Date
EP0664400A1 true EP0664400A1 (en) 1995-07-26
EP0664400B1 EP0664400B1 (en) 1999-03-17

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EP94118999A Expired - Lifetime EP0664400B1 (en) 1993-12-22 1994-12-01 Magnetic drive pump

Country Status (6)

Country Link
US (1) US5580216A (en)
EP (1) EP0664400B1 (en)
AT (1) ATE177821T1 (en)
DE (2) DE4343854C2 (en)
DK (1) DK0664400T3 (en)
ES (1) ES2129566T3 (en)

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ATE177821T1 (en) 1999-04-15
EP0664400B1 (en) 1999-03-17
DE59407964D1 (en) 1999-04-22
ES2129566T3 (en) 1999-06-16
DE4343854C2 (en) 1996-01-18
DE4343854A1 (en) 1995-07-13
US5580216A (en) 1996-12-03

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