EP2864640A1 - Motorized centrifugal pump with a rotary seal - Google Patents

Motorized centrifugal pump with a rotary seal

Info

Publication number
EP2864640A1
EP2864640A1 EP13729258.7A EP13729258A EP2864640A1 EP 2864640 A1 EP2864640 A1 EP 2864640A1 EP 13729258 A EP13729258 A EP 13729258A EP 2864640 A1 EP2864640 A1 EP 2864640A1
Authority
EP
European Patent Office
Prior art keywords
motor
shaft
pump
disc
ring
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
EP13729258.7A
Other languages
German (de)
French (fr)
Other versions
EP2864640B1 (en
Inventor
Günter Strelow
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.)
Wilo SE
Original Assignee
Wilo SE
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to DE201210012443 priority Critical patent/DE102012012443A1/en
Application filed by Wilo SE filed Critical Wilo SE
Priority to PCT/EP2013/001677 priority patent/WO2013189571A1/en
Publication of EP2864640A1 publication Critical patent/EP2864640A1/en
Application granted granted Critical
Publication of EP2864640B1 publication Critical patent/EP2864640B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • F04D13/06Units comprising pumps and their driving means the pump being electrically driven
    • F04D13/0606Canned motor pumps
    • F04D13/0613Special connection between the rotor compartments
    • 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
    • F04D29/041Axial thrust balancing
    • F04D29/0413Axial thrust balancing hydrostatic; hydrodynamic thrust bearings

Abstract

The invention relates to a motorized centrifugal pump with a motor shaft which carries the motor rotor, and the pump rotor at one end and is located together with the motor rotor in a tube-like or pot-like can to be surrounded by the pumped medium, wherein the motor shaft is guided by at least one radial bearing, wherein the internal space of the can is closed to the pump chamber by a rotary seal, which has a fixed ring washer enclosing the shaft and directly or indirectly connected to the motor or pump housing, on which washer there lies a wave washer non-rotatably mounted on the shaft with an annular contact surface to form an axial bearing along with the ring washer.

Description

Motorkreiselpumpe mit einer Gleitringdichtung  Motor centrifugal pump with a mechanical seal
Die Erfindung betrifft eine Motorkreiselpumpe mit einer Motorwelle, die den Motorenrotor und an einem Ende das Pumpenlaufrad trägt und zusammen mit dem Motorenrotor in einem Spaltrohr oder Spalttopf liegt, um vom Fördermedium umspült zu sein, wobei die Motorwelle durch mindestens ein Radiallager geführt ist. The invention relates to a motor centrifugal pump with a motor shaft which carries the motor rotor and at one end the pump impeller and is located together with the motor rotor in a canned or split pot to be lapped by the medium to be conveyed, wherein the motor shaft is guided by at least one radial bearing.
Bei Nassläuferpumpen wird der Rotor des Elektromotors vom Medium umspült. Der Stator ist vom Medium durch ein Spaltrohr opf getrennt. Die Lager des Rotors werden vom Medium geschmiert. Solche Konstruktionen sind In wet runner pumps, the rotor of the electric motor is surrounded by the medium. The stator is separated from the medium by a canned tube. The bearings of the rotor are lubricated by the medium. Such constructions are
wartungsfrei und verfügen über eine lange Lebensdauer, solange das Medium relativ sauber ist. Um sicherzustellen, dass eine Strömung durch den Rotorraum stattfindet, wird die Druckdifferenz zwischen der Saug- und der Druckseite des Laufrades genutzt. Hierzu wird der Rotor des Motors mit einer Wellenbohrung ausgeführt. maintenance-free and have a long service life, as long as the medium is relatively clean. To ensure that a flow through the rotor space takes place, the pressure difference between the suction and the pressure side of the impeller is used. For this purpose, the rotor of the motor is designed with a shaft bore.
In vielen Anwendungsbereichen sind die Medien jedoch mit Partikeln und chemischen Mitteln (Inhibitoren) kontaminiert. Dies macht es erforderlich, die Strömung im Rotorraum auf das für die Funktion des Motors erforderliche Maß insbesondere bezüglich der Lagerschmierung und der Kühlung zu begrenzen. Zudem ist es erforderlich, abrasive Partikel am Eindringen in den Rotorraum zu hindern. Es sind Lösungen bekannt, bei denen auch Gleitringdichtungen zum Einsatz kommen. Für die Aufnahme der axialen Kräfte ist bei diesen Pumpen immer zusätzlich ein Axiallager eingebaut. Aufgabe der Erfindung ist es, bei einer Motorkreiselpumpe der eingangs genannten Art das Eindringen von Partikeln in den Rotorraum zu verhindern. Dabei sollen die Herstellungskosten gering gehalten werden. In many applications, however, the media are contaminated with particles and chemical agents (inhibitors). This makes it necessary to limit the flow in the rotor space to the level required for the function of the engine, in particular with respect to the bearing lubrication and the cooling. In addition, it is necessary to prevent abrasive particles from entering the rotor space. Solutions are known in which mechanical seals are used. For the absorption of the axial forces, a thrust bearing is always additionally installed in these pumps. The object of the invention is to prevent the entry of particles into the rotor chamber in a motor centrifugal pump of the type mentioned. The manufacturing costs should be kept low.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, dass der Innenraum des Spaltrohres opfes zum Pumpenraum hin durch eine Gleitringdichtung abgeschlossen ist, die eine die Welle umschließende, mit dem Motoren- und/oder Pumpengehäuse direkt oder indirekt verbundene, feststehende Ringscheibe aufweist, an der eine auf der Welle drehfest angeordnete This object is achieved in that the interior of the can tube to the pump chamber is completed by a mechanical seal opfes having a shaft enclosing, directly or indirectly connected to the motor and / or pump housing, fixed annular disc, at the one on the Shaft rotatably arranged
Wellenringscheibe mit einer ringförmigen Kontaktfläche anliegt, um mit der Ringscheibe ein Axiallager zu bilden. Ring washer abuts with an annular contact surface to form a thrust bearing with the annular disc.
Die Gleitringdichtung wird so ausgebildet, dass sie gleichzeitig die Funktion des Axiallagers der Pumpe übernimmt. Um beide Funktionen sicherzustellen, ist es erforderlich, dass die Gleitpartner im Betrieb immer aufeinander gleiten. Außer einem Schmierspalt darf kein zusätzlicher Spalt entstehen. Die magnetische Kraft des Motors und die hydraulischen Kräfte der Pumpe sind hierzu so aufeinander abgestimmt, dass diese Funktion sichergestellt ist. Hierzu wird auch vorgeschlagen, dass die Kontaktfläche der Wellenscheibe eine innere The mechanical seal is designed so that it simultaneously assumes the function of the thrust bearing of the pump. In order to ensure both functions, it is necessary for the sliding partners to always slide on one another during operation. Apart from a lubrication gap, no additional gap may arise. The magnetic force of the motor and the hydraulic forces of the pump are coordinated with each other so that this function is ensured. For this purpose, it is also proposed that the contact surface of the wave washer an inner
ringförmige, ununterbrochene Ringkontaktfläche aufweist, mit der die annular, continuous ring contact surface, with which the
Wellenringscheibe an der feststehenden Ringscheibe dichtend anliegt. Shaft ring disc sealingly abuts the stationary ring disc.
Hierbei ist darauf zu achten, dass das Axiallager ausreichend dimensioniert und mit Schmierflüssigkeit versorgt wird. Dies wird dadurch gelöst, dass die It must be ensured that the thrust bearing is sufficiently dimensioned and supplied with lubricating fluid. This is solved by the fact that the
Wellenringscheibe in dem an der inneren Ringkontaktfläche außen Shaft ring disc in the on the inner ring contact surface outside
angrenzenden Ringbereich Ausnehmungen aufweist, durch die Flüssigkeit zur inneren Ringkontaktfläche zur Schmierung gelangt. Der Axiallagerbereich kann genutet sein und ggf. mit Schmieröffnungen in einer Axiallagernut versehen werden. adjacent annular region has recesses, passes through the liquid to the inner ring contact surface for lubrication. The thrust bearing region can be grooved and possibly provided with lubrication openings in a thrust bearing groove.
Vorzugsweise wird vorgeschlagen, dass die Ausnehmungen sich zum äußeren Rand der Wellenringscheibe hin öffnen. Hierbei können die Ausnehmungen radiale Nuten sein. Eine weitere Verbesserung der Schmierung wird erreicht, wenn die Wellenringscheibe mindestens einen Durchlass insbesondere mindestens eine Bohrung aufweist, durch die Flüssigkeit von der Scheibenrückseite zur inneren Ringkontaktfläche gelangt. It is preferably proposed that the recesses open to the outer edge of the wave washer out. In this case, the recesses may be radial grooves. A further improvement of the lubrication is achieved if the shaft ring disc has at least one passage, in particular at least one bore, through which fluid passes from the disc rear side to the inner ring contact surface.
In einer Variante ist die Wirkrichtung des Axiallagers in Richtung Pumpe gegeben. Alternativ ist die Wirkrichtung des Axiallagers in Richtung Motor. Um auch das pumpenseitige Radiallager vor Partikel zu schützen, befindet sich bei beiden Varianten diese Kombination aus Gleitringdichtung und Axiallager auf der Pumpenraumseite. In one variant, the effective direction of the thrust bearing is given in the direction of the pump. Alternatively, the effective direction of the thrust bearing in the direction of the engine. In order to also protect the pump-side radial bearing from particles, this combination of mechanical seal and axial bearing is located on the pump chamber side in both variants.
Zum Schutz des dem Laufrad nahen Radiallagers gegen Verschmutzung wird vorgeschlagen, dass das Axiallager zwischen dem Laufrad und dem Radiallager und damit in Strömungsrichtung vor dem Radiallager dichtend angeordnet ist. To protect the impeller near radial impeller against contamination is proposed that the thrust bearing between the impeller and the radial bearing and thus is arranged sealingly in the flow direction in front of the radial bearing.
Ausführungsbeispiele der Erfindung sind in den Zeichnungen dargestellt und werden im Folgenden näher beschrieben. Es zeigen Embodiments of the invention are illustrated in the drawings and will be described in more detail below. Show it
Fig. 1 einen axialen Schnitt durch die Motorkreiselpumpe, 1 is an axial section through the engine centrifugal pump,
Fig. 2 in vergrößerter Darstellung einen Schnitt durch die Wellenringscheibe der Gleitringdichtung in einer ersten Ausführung, 2 shows an enlarged view of a section through the shaft washer of the mechanical seal in a first embodiment,
Fig. 3 die Gleitringdichtung mit alternativ ausgeführten Ausnehmungen am Fig. 3, the mechanical seal with alternatively executed recesses on
Rand der Wellenringscheibe,  Edge of the wave washer,
Fig. 4 die Wellenringscheibe mit zusätzlichen Durchlässen/Bohrungen, 4 shows the shaft washer with additional passages / holes,
Fig. 5 eine Seitenansicht der Wellenringscheibe. Fig. 5 is a side view of the wave washer.
Die Motorkreiselpumpe weist eine Kreiselpumpe auf mit einem Pumpengehäuse 1 , das einen Pumpenraum 2 mit Einlass 3 und Auslass 4 besitzt und in dem ein Laufrad 5 gelagert ist, das auf dem Ende einer Motorwelle 6 befestigt ist. Die Motorwelle 6 ist als Hohlwelle in einem Spalttopf 7 durch zwei Radiallager 8, 9 gelagert. Das der Pumpe abgewandte Radiallager 8 ist im geschlossenen Ende des Spalttopfs 7 befestigt und das der Pumpe und dem Laufrad 5 zugewandte Radiallager 9 liegt innerhalb einer Buchse 10, die sich zum Pumpenlaufrad hin zu einem Flansch 10a erweitert, der zwischen dem Pumpenraum 2 und dem The motor centrifugal pump has a centrifugal pump with a pump housing 1, which has a pump chamber 2 with inlet 3 and outlet 4 and in which an impeller 5 is mounted, which is mounted on the end of a motor shaft 6. The motor shaft 6 is mounted as a hollow shaft in a split pot 7 by two radial bearings 8, 9. The remote from the pump radial bearing 8 is fixed in the closed end of the split pot 7 and the pump and the impeller 5 facing radial bearing 9 is located within a sleeve 10, which expands to the pump impeller to a flange 10 a, which between the pump chamber 2 and the
Flansch 7a des Spalttopfes liegt. Die Motorwelle 6 trägt innerhalb des Spalttopfes 7 den Motorenrotor 11. Der Spalttopf 7 ist außen vom Motorenstator 12 Flange 7a of the split pot is located. The motor shaft 6 carries within the gap pot 7, the motor rotor 11. The split pot 7 is outside of the motor stator 12th
umgeben. surround.
In oder an der Buchse 10 und/oder in oder an dem Flansch 10a ist eine feststehende Ringscheibe 13 koaxial befestigt, die die Motorwelle 6 umgibt und mit der Motorwelle 6 einen Ringspalt 14 bildet, wobei die Ringspaltbreite nur so groß ausgeführt ist, dass die Ringscheibe 3 die zylindrische Außenfläche der Motorwelle nicht berührt. In or on the sleeve 10 and / or in or on the flange 10a, a fixed annular disc 13 is coaxially fixed, which surrounds the motor shaft 6 and forms an annular gap 14 with the motor shaft 6, wherein the annular gap width is made only so large that the annular disc 3 does not touch the cylindrical outer surface of the motor shaft.
Auf der dem Laufrad 5 zugewandten Seite der Ringscheibe 13 liegt an dieser eine Wellenringscheibe 15 an, die koaxial auf der Motorwelle 6 befestigt ist, so dass sie sich mit der Motorwelle dreht. Die Wellenringscheibe 15 bildet auf ihrer der Ringscheibe 13 zugewandten Seite eine ringförmige Kontaktfläche 16, mit der sie dichtend an der Ringscheibe 13 anliegt unter Bildung eines On the side facing the impeller 5 of the annular disc 13 is located on this a shaft washer 15, which is coaxially mounted on the motor shaft 6 so that it rotates with the motor shaft. The annular shaft plate 15 forms on its side facing the annular disc 13 an annular contact surface 16, with which it bears sealingly against the annular disc 13 to form a
Flüssigkeitsfilmes zwischen beiden Scheiben 13, 15. Die Scheiben 13 und 15 bilden somit sowohl eine Gleitringdichtung als auch ein Axiallager. Liquid film between the two discs 13, 15. The discs 13 and 15 thus form both a mechanical seal and a thrust bearing.
Um den Flüssigkeitsfilm zwischen beiden Scheiben 13, 15 ausreichend mit Flüssigkeit zu versorgen, sind im äußeren Rand der Ringkontaktfläche 6 der Scheibe 15 Ausnehmungen 17 in Form radialer Nuten in regelmäßigen In order to provide the liquid film between the two discs 13, 15 sufficiently liquid, are in the outer edge of the ring contact surface 6 of the disc 15 recesses 17 in the form of radial grooves in regular
Abständen über den Umfang eingebracht. Diese Ausnehmungen sind nicht bis zur inneren Öffnung 18 der Wellenringscheibe 15 geführt, sondern bilden mit dieser einen Abstand und damit eine innere ringförmige Ringkontaktfläche 9, mit der die Wellenringscheibe 15 an der feststehenden Ringscheibe 13 dichtend und gleitend anliegt. Interspaces over the circumference introduced. These recesses are not guided to the inner opening 18 of the shaft ring disk 15, but form with this a distance and thus an inner annular ring contact surface 9, with which the shaft ring disk 15 bears sealingly and slidably against the stationary annular disk 13.
Es sind vorzugsweise zwei, vier, sechs oder acht Ausnehmungen 17 angeordnet, die sich jeweils zum äußeren Rand der Wellenringscheibe 15 hin öffnen, damit von außen Flüssigkeit in die Ausnehmungen gelangt und zur Kontaktfläche 19 geführt wird. Hierbei können die Ausnehmungen 17 unterschiedliche Formen aufweisen, wie die Fig. 2 bis 4 zeigen. Die Zuführung von Flüssigkeit zur There are preferably two, four, six or eight recesses 17 are arranged, which open in each case to the outer edge of the shaft ring disk 15, so From the outside fluid enters the recesses and is guided to the contact surface 19. Here, the recesses 17 may have different shapes, as Figs. 2 to 4 show. The supply of liquid to
Kontaktfläche 16 wird in einer weiteren Ausführung noch dadurch erhöht, dass die Wellenringscheibe 15 mindestens eine und vorzugsweise zwei oder mehr quer verlaufende insbesondere achsparallele Durchlässe insbesondere Contact surface 16 is increased in a further embodiment by the fact that the wave washer 15 at least one and preferably two or more transverse, in particular axially parallel passages in particular
Bohrungen 20 aufweist, durch die Flüssigkeit von der Scheibenrückseite zur inneren Ringkontaktfläche 19 fließt. Holes 20, flows through the liquid from the back of the disk to the inner ring contact surface 19.
Im Ausführungsbeispiel liegt die Wellenringscheibe 15 auf der dem Laufrad 5 zugewandten Seite der feststehenden Ringscheibe 13. In einer alternativen, nicht dargestellten Ausführung liegt die Wellenringscheibe 15 auf der dem Laufrad abgewandten Seite der feststehenden Ringscheibe 13. In diesem Fall ist dafür zu sorgen, dass der Rotor auf das Axiallager in entgegengesetzter Richtung axial einwirkt. In the exemplary embodiment, the shaft ring disk 15 is located on the side facing the impeller 5 of the fixed ring disk 13. In an alternative embodiment, not shown, the shaft ring disk 15 is located on the side facing away from the impeller of the fixed ring disk 13. In this case, ensure that Rotor axially acting on the thrust bearing in the opposite direction.

Claims

Ansprüche claims
1. Motorkreiselpumpe mit einer Motorwelle, die den Motorenrotor (11 ) und an einem Ende das Pumpenlaufrad (5) trägt und zusammen mit dem 1. Motor centrifugal pump with a motor shaft which carries the motor rotor (11) and at one end the pump impeller (5) and together with the
Motorenrotor in einem Spaltrohr oder Spalttopf (7) liegt, um vom  Engine rotor in a canned or containment shell (7) is located to
Fördermedium umspült zu sein, wobei die Motorwelle (6) durch  Being circulated medium, the motor shaft (6) through
mindestens ein Radiallager (8, 9) geführt ist, dadurch  at least one radial bearing (8, 9) is guided, characterized
gekennzeichnet, dass der Innenraum des Spaltrohres/-topfes (7) zum Pumpenraum hin durch eine Gleitringdichtung (13, 15)  in that the interior of the split tube / pot (7) faces the pump chamber through a mechanical seal (13, 15)
abgeschlossen ist, die eine die Welle (6) umschließende, mit dem  is completed, one of the shaft (6) enclosing, with the
Motoren- und/oder Pumpengehäuse direkt oder indirekt verbundene, feststehende Ringscheibe (13) aufweist, an der eine auf der Welle (6) drehfest angeordnete Wellenringscheibe (15) mit einer ringförmigen Kontaktfläche (16) anliegt um mit der Ringscheibe (13) ein Axiallager zu bilden.  Motor and / or pump housing directly or indirectly connected, fixed annular disc (13) on which on the shaft (6) rotatably mounted shaft ring disc (15) with an annular contact surface (16) abuts with the annular disc (13) a thrust bearing to build.
2. Motorkreiselpumpe nach Anspruch 1 , d a d u r c h 2. Motor centrifugal pump according to claim 1, d a d u r c h
gekennzeichnet, dass die Kontaktfläche ( 6) der  in that the contact surface (6) of the
Wellenringscheibe (15) eine innere ringförmige, ununterbrochene  Shaft washer (15) an inner annular, continuous
Ringkontaktfläche (19) aufweist, mit der die Wellenringscheibe an der feststehenden Ringscheibe (13) dichtend anliegt.  Ring contact surface (19), with which the shaft ring disc sealingly bears against the stationary annular disc (13).
3. Motorkreiselpumpe nach Anspruch 2, dadurch 3. Motor centrifugal pump according to claim 2, characterized
gekennzeichnet, dass die Wellenringscheibe (15) in dem an der inneren Ring kontaktfläche (19) außen angrenzenden Ringbereich  in that the annular shaft disc (15) in the contact surface on the inner ring (19) outside adjacent annular region
Ausnehmungen (17) aufweist, durch die Flüssigkeit zur inneren  Recesses (17), through the liquid to the inner
Ringkontaktfläche (19) zur Schmierung gelangt. Ring contact surface (19) passes for lubrication.
4. Motorkreiselpumpe nach Anspruch 3, dadurch 4. Motor centrifugal pump according to claim 3, characterized
gekennzeichnet, dass die Ausnehmungen (17) sich zum äußeren Rand der Wellenringscheibe (15) hin öffnen.  in that the recesses (17) open towards the outer edge of the shaft ring disk (15).
5. Motorkreiselpumpe nach Anspruch 3 oder 4, dadurch 5. Motor centrifugal pump according to claim 3 or 4, characterized
gekennzeichnet, dass die Ausnehmungen (17) radiale Nuten sind.  characterized in that the recesses (17) are radial grooves.
6. Motorkreiselpumpe nach einem der Ansprüche 2 bis 5, d a d u r c h 6. Motor centrifugal pump according to one of claims 2 to 5, d a d u r c h
gekennzeichnet, dass die Wellenringscheibe (15) mindestens einen Durchlass insbesondere mindestens eine Bohrung (20) aufweist, durch die Flüssigkeit von der Scheibenrückseite zur inneren  in that the wave-ring disc (15) has at least one passage, in particular at least one bore (20), through which fluid flows from the rear side of the disc to the inner one
Ringkontaktfläche (19) zur Schmierung gelangt.  Ring contact surface (19) passes for lubrication.
7. Kreiselmotorpumpe nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass das pumpenseitige Radiallager (9) Bestandteil des Axiallagers ist, das eine Gleitringdichtung bildet. 7. Centrifugal motor pump according to one of the preceding claims, characterized in that the pump-side radial bearing (9) is part of the thrust bearing, which forms a mechanical seal.
8. Kreiselmotorpumpe nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass zum Schutz des dem Laufrad (5) nahen Radiallagers (9) gegen Verschmutzung das Axiallager (13, 15) zwischen dem Laufrad und dem Radiallager (9) und damit in Strömungsrichtung vor dem Radiallager (9) dichtend angeordnet ist. 8. Centrifugal motor pump according to one of the preceding claims, characterized in that to protect the impeller (5) near radial bearing (9) against contamination, the thrust bearing (13, 15) between the impeller and the radial bearing (9) and thus in the flow direction before Radial bearing (9) is arranged sealing.
EP13729258.7A 2012-06-22 2013-06-07 Motorized centrifugal pump with a rotary seal Active EP2864640B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE201210012443 DE102012012443A1 (en) 2012-06-22 2012-06-22 Motor centrifugal pump with a mechanical seal
PCT/EP2013/001677 WO2013189571A1 (en) 2012-06-22 2013-06-07 Motorized centrifugal pump with a rotary seal

Publications (2)

Publication Number Publication Date
EP2864640A1 true EP2864640A1 (en) 2015-04-29
EP2864640B1 EP2864640B1 (en) 2019-03-27

Family

ID=48628604

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13729258.7A Active EP2864640B1 (en) 2012-06-22 2013-06-07 Motorized centrifugal pump with a rotary seal

Country Status (4)

Country Link
EP (1) EP2864640B1 (en)
CN (1) CN104411977B (en)
DE (1) DE102012012443A1 (en)
WO (1) WO2013189571A1 (en)

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JP2020153302A (en) * 2019-03-20 2020-09-24 株式会社ケーヒン Bearing structure of electric fluid pump

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Also Published As

Publication number Publication date
CN104411977B (en) 2018-02-23
WO2013189571A1 (en) 2013-12-27
DE102012012443A1 (en) 2013-12-24
EP2864640B1 (en) 2019-03-27
CN104411977A (en) 2015-03-11

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