EP0664400B1 - Magnetic drive pump - Google Patents

Magnetic drive pump Download PDF

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Publication number
EP0664400B1
EP0664400B1 EP94118999A EP94118999A EP0664400B1 EP 0664400 B1 EP0664400 B1 EP 0664400B1 EP 94118999 A EP94118999 A EP 94118999A EP 94118999 A EP94118999 A EP 94118999A EP 0664400 B1 EP0664400 B1 EP 0664400B1
Authority
EP
European Patent Office
Prior art keywords
impeller
bush
pump
magnetic rotor
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
EP94118999A
Other languages
German (de)
French (fr)
Other versions
EP0664400A1 (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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Filing date
Publication date
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Publication of EP0664400A1 publication Critical patent/EP0664400A1/en
Application granted granted Critical
Publication of EP0664400B1 publication Critical patent/EP0664400B1/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/04—Shafts or bearings, or assemblies thereof
    • F04D29/046—Bearings
    • F04D29/047—Bearings hydrostatic; hydrodynamic
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/021—Units comprising pumps and their driving means containing a coupling
    • F04D13/024—Units comprising pumps and their driving means containing a coupling a magnetic coupling
    • F04D13/026—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 according to the preamble of claim 1.
  • the pump shaft is made of metal and is via a bearing shell and bearing rings made of silicon carbide in Plain bearing bushes, preferably made of the same material as the bearing shell, stored.
  • US-A-4 850 818 discloses a corrosion resistant magnetic pump with a shaft made of ceramic material and a graduated Area, with the shaft over its graduated area in cooperation with a ceramic bearing bush Storage material works together.
  • a plain bearing for the rotor is one Pump with at least one radial bearing and two axial bearings known.
  • the invention has for its object the generic To further develop the magnetic pump in such a way that with simplified Build up the corrosion resistance against aggressive media is further improved.
  • Claim 2 gives a preferred embodiment according to the Invention.
  • 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 embodiment shown there one on a with a drive motor, not shown provided motor pin 10 seated drive rotor 12 on one on the outer circumference of a containment shell 14 Plastic material, arranged drive magnet ring 16 wears. Inside the can 14 is a magnet rotor 18 rotatably mounted, the magnet rotor magnetic ring 20 over the wall of the containment shell with the drive magnet ring 16 of the drive rotor 12 magnetic is coupled.

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 nach dem Oberbegriff von Anspruch 1.The invention relates to a magnetic pump for corrosive media according to the preamble of claim 1.

Es sind Magnetpumpen bekannt mit einem motorbetriebenen, am Außenumfang eines Spalttopfs 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 Magnet rotor und an ihrem anderen Ende drehfest mit einem Laufrad verbundenen Pumpwelle, die in einem Pumpenrückteil in zwei Gleitlagerbuchsen aus Siliciumcarbid radial gelagert ist, wobei die das Pumpeninnere begrenzenden Flächen des Spalttopfs, des Pumpenrückteiles, des Laufrades und des Magnetrotors aus Kunststoff bestehen. 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.Magnetic pumps are known with a motor-driven, on Outer circumference of a can arranged drive motor, a arranged within the containment shell, by the drive motor rotatable during the rotation and magnetically coupled with it Magnet rotor and one at one end rotatably with the magnet rotor and at its other end rotatably with one Impeller connected pump shaft, which in a pump back two plain bearing bushes made of silicon carbide are mounted radially, the surfaces of the pump delimiting the interior of the Containment shell, the pump back, the impeller and the Magnet rotor made of plastic. With such magnetic pumps it is necessary that from the magnet rotor, the pump shaft and the impeller of the rotating unit in the pump housing to be stored both radially and axially.

Bislang ist es durchaus 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 is quite common to use the pump shaft of this type Magnetic pumps for highly corrosive media, such as those in The chemical industry uses steel too manufacture and then to protect against the aggressive media To encase plastic. Have impeller and magnetic rotor usually injected or coated metal bushings for Torque transmission. These have to be expensive Sealing elements sealed against the aggressive media become.

Bei der gattungsgemäßen Magnetpumpe gemäß der EP-A-0 563 437 besteht die Pumpenwelle geeigneterweise aus Metall und ist über eine Lagerschale und Lagerringe aus Siliciumcarbid in Gleitlagerbuchsen, vorzugsweise aus dem gleichen Material wie die Lagerschale, gelagert. Eine Laufradbuchse und eine Magnetrotorbuchse, vorzugsweise aus dem gleichen Material wie die Lagerschale, dienen dabei einer reinen Axiallager-Funktion, so daß für die Drehmomentenübertragung eine entsprechende drehfeste Verbindung der Metall-Bauteile des Magnetrotors, der Pumpenwelle und des Laufrades vorgesehen ist, wobei die entsprechenden Verbindungen der Metall-Bauteile durch Dichtungen zuverlässig gegen die zu pumpenden aggressiven Medien geschützt werden müssen, weshalb eine erheblich Anzahl von Bauteilen erforderlich ist.In the generic magnetic pump according to EP-A-0 563 437 suitably, the pump shaft is made of metal and is via a bearing shell and bearing rings made of silicon carbide in Plain bearing bushes, preferably made of the same material as the bearing shell, stored. An impeller bushing and a magnetic rotor bushing, preferably made of the same material as the bearing shell, serve a purely axial bearing function, so that a corresponding one for the torque transmission non-rotatable connection of the metal components of the magnetic rotor, the pump shaft and the impeller is provided, the corresponding connections of the metal components reliably against seals to be pumped by means of seals aggressive media must be protected, which is why a considerable number of components is required.

Aus Chemietechnik, Band 22, Nr. 6, S. 76 bis 81, ist eine Magnetpumpe bekannt, die eine Welle und Gleitlager aus Siliciumcarbid umfaßt und bei der die Welle der Momentenübertragung dient, während die das Gleitlager bildenden Lagerhülsen zur Aufnahme der axialen und radialen Kräfte dienen.A chemical pump is from Chemietechnik, Volume 22, No. 6, pp. 76 to 81 known which has a shaft and plain bearings made of silicon carbide includes and in which the wave of torque transmission serves while the bearing sleeves forming the plain bearing for Serve absorption of the axial and radial forces.

Die US-A-4 850 818 offenbart eine korrosionsbeständige Magnetpumpe mit einer Welle aus keramischem Material und einem abgestuften Bereich, wobei die Welle über ihren abgestuften Bereich in Zusammenarbeit mit einer Lagerbuchse aus keramischem Material zur Lagerung zusammenarbeitet.US-A-4 850 818 discloses a corrosion resistant magnetic pump with a shaft made of ceramic material and a graduated Area, with the shaft over its graduated area in cooperation with a ceramic bearing bush Storage material works together.

Aus der EP-A-0 118 056 ist ein Gleitlager für den Läufer einer Pumpe mit mindestens einem Radiallager und zwei Axiallagern bekannt.From EP-A-0 118 056 a plain bearing for the rotor is one Pump with at least one radial bearing and two axial bearings known.

Die DE-A-3 413 930 offenbart eine Kreiselpumpe, bei der ein Laufrad mit einer Welle aus einem keramischen Werkstoff in einem einzigen Stück gefertigt ist und Lagerbuchsen aus keramischem Werkstoff hinter bzw. vor dem Laufrad angeordnet sind, während die Welle mit einem Innenrotor verschraubt ist. DE-A-3 413 930 discloses a centrifugal pump in which a Impeller with a shaft made of a ceramic material in is made in a single piece and bushings made of ceramic Material is arranged behind or in front of the impeller, while the shaft is bolted to an inner rotor.

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 the generic To further develop the magnetic pump in such a way that with simplified Build up the corrosion resistance against aggressive media is further improved.

Erfindungsgemäß wird diese Aufgabe durch eine gattungsgemäße Magnetpumpe gelöst, die zusätzlich die Merkmale des Kennzeichens von Anspruch 1 löst.According to the invention, this object is achieved by a generic Solved solenoid pump, which also features the Characteristic of claim 1 solves.

Anspruch 2 gibt eine bevorzugte Ausführungsform gemäß der Erfindung an.Claim 2 gives a preferred embodiment according to the Invention.

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 corrosion resistance is achieved with a simple structure of magnetic pumps of the generic type improve by the pump shaft, the impeller sleeve and the Magnetic rotor sleeve made of hard ceramic, preferably made of Silicon carbide, are manufactured, the construction so is carried out that the plain bearing bushes, also from Silicon carbide exist, together with the impeller bushing and the magnetic rotor bush also 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 gives the main advantage that inside the pump there is no metal part and therefore a failure of the Pump against corrosion is next to impossible. The Simplicity of construction 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 description below in which an embodiment with reference to the schematic drawing in individual is explained.

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 the drawing shows, the magnetic pump according to the invention in the embodiment shown there one on a with a drive motor, not shown provided motor pin 10 seated drive rotor 12 on one on the outer circumference of a containment shell 14 Plastic material, arranged drive magnet ring 16 wears. Inside the can 14 is a magnet rotor 18 rotatably mounted, the magnet rotor magnetic ring 20 over the wall of the containment shell with the drive magnet ring 16 of the drive rotor 12 magnetic is coupled.

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.In the plastic mass of the complete on its outer surface made of corrosion-resistant plastic material The magnet rotor 18 is made of a magnet rotor sleeve 22 in a rotationally fixed manner Silicon carbide integrated, one in the in the drawing end face of the magnetic rotor 18 pointing to the left has lying free circular axial bearing surface 24. The magnetic rotor bushing 22 is form-fitting via a Polygon profile, which ensures perfect torque transmission allows with a pump shaft 26 made of silicon carbide connected. The pump shaft 26 is in two Slide bearing bushes 28, 30 rotatably mounted in the pump housing are arranged such that they each have a circular, exposed end bearing surface 32, 34 form.

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 facing away from the magnet rotor 18 26 is an impeller bushing via a polygon profile PC 4 36 rotatably in a manner suitable for torque transmission connected to the plastic mass of an impeller 38 is poured. The impeller bush 36 also exists made of silicon carbide and has an annular shape Thrust bearing surface 40, the end bearing surface 34 of the Slide bearing bush 28 faces.

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 Siliciumcarbid-Siliciumcarbid-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 pump housing-fixed plain bearing bushes 30, 28 with the Axial bearing surfaces 24, 40 of the magnetic rotor bushing 22 and the Impeller bushing 36 are the otherwise usual axial bearings superfluous, namely by the pump shaft 26 by clean Contact of the aforementioned axial bearing surfaces with the aforementioned Front bearing surfaces based on silicon carbide-silicon carbide is axially supported. The radial bearing too the pump shaft 26 is through a pure silicon carbide-silicon carbide contact, namely between the pump shaft 26 itself and the plain bearing bushes 28, 30, guaranteed so that all warehouse functions through corrosion-resistant and maintenance-free Silicon carbide-silicon carbide contacts accomplished are. Because the inside of the pump housing, the impeller 38 and the magnetic rotor 18 all made of corrosion-resistant Plastic material can be used with the aggressive medium to be pumped only surfaces made of silicon carbide or plastic come into contact. This results in high operational reliability.

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 (2)

  1. A magnetic pump for corrosive media having a motorised drive rotor (12) arranged at the outer periphery of a can (14), a magnetic rotor (18) which is arranged within the can (14) and which can be entrained by the drive rotor (12) during rotation and is coupled thereto magnetically, and a pump shaft (26) which is connected non-rotatably at its one end to the magnetic rotor (18) and at its other end is connected non-rotatably to an impeller (38), which pump shaft is mounted radially and axially in a pump back part in two plain bearing bushes (28, 30) of silicon carbide, wherein the plain bearing bush (28) adjacent to the impeller (38) for the pump shaft (26) comprises a first exposed circular ring-shaped end journal bearing surface (34) facing the impeller (38), the plain bearing bush (30) adjacent to the magnetic rotor (18) for the pump shaft (26) comprises a second exposed circular ring-shaped end journal bearing surface (32) facing the magnetic rotor (18), an impeller bush (36) of hard ceramic is connected to the impeller (38), which impeller bush comprises an exposed first axial bearing surface (40) facing the first end journal bearing surface (34), and a magnetic rotor bush (22) of hard ceramic is connected to the magnetic rotor (18), which magnetic rotor bush comprises an exposed second axial bearing surface (24) facing the second end journal bearing surface (30), characterised in that the pump shaft (26) consists of hard ceramic; in that the impeller bush (36) is cast with the impeller (38) and the magnetic rotor bush (22) is cast with the magnetic rotor (18) non-rotatably; in that the pump shaft (26) is connected in each case by way of a polygonal profile positively to the impeller bush (36) and to the magnetic rotor bush (22) non-rotatably; and in that the surfaces of the can (14), of the pump back part, of the impeller (38) and of the magnetic rotor (18) with respect to the interior of the pump consist of synthetic material.
  2. A magnetic pump according to claim 1, characterised in that silicon carbide is provided as the hard ceramic at least for individual components.
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 EP0664400A1 (en) 1995-07-26
EP0664400B1 true EP0664400B1 (en) 1999-03-17

Family

ID=25932353

Family Applications (1)

Application Number Title Priority Date Filing Date
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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Also Published As

Publication number Publication date
ES2129566T3 (en) 1999-06-16
DE59407964D1 (en) 1999-04-22
ATE177821T1 (en) 1999-04-15
DE4343854A1 (en) 1995-07-13
US5580216A (en) 1996-12-03
DK0664400T3 (en) 1999-10-11
EP0664400A1 (en) 1995-07-26
DE4343854C2 (en) 1996-01-18

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