EP2864640B1 - Motorized centrifugal pump with a rotary seal - Google Patents

Motorized centrifugal pump with a rotary seal Download PDF

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Publication number
EP2864640B1
EP2864640B1 EP13729258.7A EP13729258A EP2864640B1 EP 2864640 B1 EP2864640 B1 EP 2864640B1 EP 13729258 A EP13729258 A EP 13729258A EP 2864640 B1 EP2864640 B1 EP 2864640B1
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EP
European Patent Office
Prior art keywords
contact surface
washer
centrifugal pump
annular
shaft
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Application number
EP13729258.7A
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German (de)
French (fr)
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EP2864640A1 (en
Inventor
Günter Strelow
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Wilo SE
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Wilo SE
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Publication of EP2864640A1 publication Critical patent/EP2864640A1/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
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
    • F04D13/0606—Canned motor pumps
    • F04D13/0613—Special connection between the rotor compartments
    • 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

Definitions

  • 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.
  • the rotor of the electric motor is surrounded by the medium.
  • the stator is separated from the medium by a canned / pot.
  • the bearings of the rotor are lubricated by the medium.
  • Such constructions are maintenance free and have a long life, as long as the medium is relatively clean.
  • the pressure difference between the suction and the pressure side of the impeller is used.
  • the rotor of the motor is designed with a shaft bore.
  • 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 DE 195 48 471 discloses an engine centrifugal pump wherein the mechanical seal also forms the thrust bearing.
  • 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.
  • 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.
  • the shaft ring disc has recesses in the outside adjacent to the inner ring contact surface ring portion, 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.
  • the recesses open to the outer edge of the wave washer out.
  • the recesses may be radial grooves.
  • the shaft ring disc has at least one passage, in particular at least one bore, through which fluid passes from the rear side of the disc to the inner ring contact surface.
  • the effective direction of the thrust bearing is given in the direction of the pump.
  • the effective direction of the thrust bearing in the direction of the engine.
  • this combination of mechanical seal and axial bearing is located on the pump chamber side in both variants.
  • 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 can 7 and the pump and the impeller 5 facing radial bearing 9 is located within a sleeve 10, which expands to the impeller towards a flange 10 a, which extends between the pump chamber 2 and the 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 surrounded outside of the motor stator 12.
  • 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 13 does not touch the cylindrical outer surface of the motor shaft.
  • a shaft washer 15 which is coaxially mounted on the motor shaft 6 so that it rotates with the motor shaft.
  • the annular disk 15 forms on its annular disk 13 side facing an annular contact surface 16, with which it rests sealingly against the annular disc 13 to form a liquid film between the two discs 13, 15.
  • the discs 13 and 15 thus form both a mechanical seal and a thrust bearing ,
  • 15 recesses 17 are introduced in the form of radial grooves in the outer edge of the ring contact surface 16 of the disc at regular intervals over the circumference. 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 19, with which the shaft ring disk 15 bears sealingly and slidably on the stationary annular disk 13.
  • the recesses 17 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.
  • the recesses 17 may have different shapes, such as Fig. 2 to 4 demonstrate.
  • the supply of liquid to the 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 holes 20, flows through the liquid from the back of the disc to the inner ring contact surface 19.
  • 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.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Description

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/-topf getrennt. Die Lager des Rotors werden vom Medium geschmiert. Solche Konstruktionen sind 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.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 / pot. The bearings of the rotor are lubricated by the medium. Such constructions are maintenance free and have a long 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.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.

Die DE 195 48 471 offenbart eine Motorkreiselpumpe wobei die Gleitringdichtung auch das Axiallager bildet.The DE 195 48 471 discloses an engine centrifugal pump wherein the mechanical seal also forms the thrust bearing.

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.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 die Motorkreiselpumpe gemäß Anspruch 1 ausgebildet ist.This object is achieved in that the engine centrifugal pump is designed according to claim 1.

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. Erfindungsgemäß weist die Kontaktfläche der Wellenscheibe eine innere ringförmige, ununterbrochene Ringkontaktfläche auf, mit der die Wellenringscheibe an der feststehenden Ringscheibe dichtend anliegt. Hierbei ist darauf zu achten, dass das Axiallager ausreichend dimensioniert und mit Schmierflüssigkeit versorgt wird. Dies wird erfindungsgemäß dadurch gelöst, dass die Wellenringscheibe in dem an der inneren Ringkontaktfläche außen 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.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. According to the invention, the contact surface of the wave washer on an inner annular, uninterrupted ring contact surface, with which the shaft ring disc sealingly bears against the stationary annular disc. It must be ensured that the thrust bearing is sufficiently dimensioned and supplied with lubricating fluid. This is inventively achieved in that the shaft ring disc has recesses in the outside adjacent to the inner ring contact surface ring portion, 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.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.

Erfindungsgemäß weist die Wellenringscheibe mindestens einen Durchlass insbesondere mindestens eine Bohrung auf, durch die Flüssigkeit von der Scheibenrückseite zur inneren Ringkontaktfläche gelangt.According to the invention, the shaft ring disc has at least one passage, in particular at least one bore, through which fluid passes from the rear side of the disc 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

Fig. 1
einen axialen Schnitt durch die Motorkreiselpumpe,
Fig. 2
in vergrößerter Darstellung einen Schnitt durch die Wellenringscheibe der Gleitringdichtung in einer ersten Ausführung,
Fig. 3
die Gleitringdichtung mit alternativ ausgeführten Ausnehmungen am Rand der Wellenringscheibe,
Fig. 4
die Wellenringscheibe mit zusätzlichen Durchlässen/Bohrungen,
Fig. 5
eine Seitenansicht der Wellenringscheibe.
Embodiments of the invention are illustrated in the drawings and will be described in more detail below. Show it
Fig. 1
an axial section through the engine centrifugal pump,
Fig. 2
in an enlarged view a section through the shaft washer of the mechanical seal in a first embodiment,
Fig. 3
the mechanical seal with alternatively executed recesses at the edge of the shaft washer,
Fig. 4
the shaft washer with additional passages / holes,
Fig. 5
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.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.

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 Flansch 7a des Spalttopfes liegt. Die Motorwelle 6 trägt innerhalb des Spalttopfes 7 den Motorenrotor 11. Der Spalttopf 7 ist außen vom Motorenstator 12 umgeben.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 can 7 and the pump and the impeller 5 facing radial bearing 9 is located within a sleeve 10, which expands to the impeller towards a flange 10 a, which extends between the pump chamber 2 and the 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 surrounded outside of the motor stator 12.

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 13 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 13 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 Flüssigkeitsfilmes zwischen beiden Scheiben 13, 15. Die Scheiben 13 und 15 bilden somit sowohl eine Gleitringdichtung als auch ein Axiallager.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 disk 15 forms on its annular disk 13 side facing an annular contact surface 16, with which it rests sealingly against the annular disc 13 to form a 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 16 der Scheibe 15 Ausnehmungen 17 in Form radialer Nuten in regelmäßigen 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 19, mit der die Wellenringscheibe 15 an der feststehenden Ringscheibe 13 dichtend und gleitend anliegt.In order to provide the liquid film between the two discs 13, 15 sufficiently liquid, 15 recesses 17 are introduced in the form of radial grooves in the outer edge of the ring contact surface 16 of the disc at regular intervals over the circumference. 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 19, with which the shaft ring disk 15 bears sealingly and slidably on 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 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 Bohrungen 20 aufweist, durch die Flüssigkeit von der Scheibenrückseite zur inneren Ringkontaktfläche 19 fließt.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. In this case, the recesses 17 may have different shapes, such as Fig. 2 to 4 demonstrate. The supply of liquid to the 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 holes 20, flows through the liquid from the back of the disc 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 (5)

  1. Motorized centrifugal pump having a motor shaft, which bears the motor rotor (11) and, at one end, the pump impeller (5) and, together with the motor rotor, is located in a tube-like or pot-like can (7) in order to be surrounded by the delivery medium, the motor shaft (6) being guided by at least one radial bearing (8, 9), the interior of the tube-like pot-like can (7) being sealed off with respect to the pump chamber by a rotary seal (13, 15), which has a stationary annular washer (13) enclosing the shaft (6), and which is connected directly or indirectly to the motor and/or pump housing, and on which a wave washer (15) rotationally fixedly arranged on the shaft (6) rests with an annular contact surface (16) in order to form an axial bearing with the annular washer (13),
    the contact surface (16) of the wave washer (15) having an inner, ring-like uninterrupted annular contact surface (19), with which the wave washer rests in a sealing manner on the stationary annular washer (13), the wave washer (15) having, in the annular region adjoining the inner annular contact surface (19) on the outside, recesses (17), through which liquid reaches the inner annular contact surface (19) for lubrication, characterized in that
    the wave washer (15) has at least one passage, in particular at least one hole (20), through which liquid from the rear side of the washer reaches the inner annular contact surface (19) for lubrication.
  2. Motorized centrifugal pump according to Claim 1, characterized in that the recesses (17) open towards the outer edge of the wave washer (15).
  3. Motorized centrifugal pump according to Claim 1 or 2, characterized in that the recesses (17) are radial grooves.
  4. Motorized centrifugal pump according to one of the preceding claims, characterized in that the pump-side radial bearing (9) is a constituent part of the axial bearing, which forms a rotary seal.
  5. Motorized centrifugal pump according to one of the preceding claims, characterized in that in order to protect the radial bearing (9) that is close to the impeller (5) against contamination, the axial bearing (13, 15) is arranged in a sealing manner between the pump impeller (5) and the radial bearing (9) and therefore upstream of the radial bearing (9) in the flow direction.
EP13729258.7A 2012-06-22 2013-06-07 Motorized centrifugal pump with a rotary seal Active EP2864640B1 (en)

Applications Claiming Priority (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 EP2864640A1 (en) 2015-04-29
EP2864640B1 true EP2864640B1 (en) 2019-03-27

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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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Publication number Priority date Publication date Assignee Title
IT201800000658A1 (en) * 2018-01-10 2019-07-10 Dab Pumps Spa PUMP ASSEMBLY WITH PERFECTED AIR GUN SLEEVE AND COUPLING BETWEEN ROTOR AND IMPROVED AIR GAP SLEEVE
DE102018009849B4 (en) * 2018-12-18 2024-08-08 Wilo Se Wet rotor pump
JP7126467B2 (en) * 2019-03-20 2022-08-26 日立Astemo株式会社 Bearing structure in electric fluid pump
CN114438468B (en) * 2022-02-15 2022-11-08 上海超导科技股份有限公司 Heating system for superconducting strip preparation

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GB1138095A (en) * 1966-07-27 1968-12-27 Worthington Corp Centrifugal and face contact seal
FR1505487A (en) * 1966-10-28 1967-12-15 Guinard Pompes Improvement in leak-controlled rotary joints
FR2508563B1 (en) * 1981-06-26 1985-11-08 Electro Hydraulique Seh ELECTRIC MOTOR PUMP WITH WET ROTOR
US4884945A (en) * 1988-07-21 1989-12-05 John Crane, Inc. Dynamic seal arrangement for impeller pump
DE19548471C1 (en) * 1995-12-22 1997-06-05 Grundfos As Circulation pump system e.g. for wet-running motor
DE29618558U1 (en) * 1996-10-24 1996-12-19 Wilo Gmbh, 44263 Dortmund Motor vehicle cooling water pump
US6255752B1 (en) * 1997-07-26 2001-07-03 Allweiler Ag Mounting for a turbo-machine rotor and its use
DE19943862A1 (en) * 1999-09-13 2001-03-15 Wilo Gmbh Wet rotor pump with mounting plate
DE10028951A1 (en) * 2000-06-16 2002-01-03 Grundfos As Axial sliding bearing for a wet running centrifugal pump
DE10059458A1 (en) * 2000-11-30 2002-06-13 Grundfos As Electric drive motor for a centrifugal pump, especially for heating systems
DE102004024931A1 (en) * 2004-05-19 2005-12-15 Siemens Ag Circulating pump used as a cooling water circulating pump in a vehicle comprises a spiral housing and an impeller having annular attachments
DE102004051398B4 (en) * 2004-10-21 2019-02-21 Continental Automotive Gmbh Thrust bearing for a rotor
DE102008064162B4 (en) * 2008-12-19 2013-06-06 Bühler Motor GmbH Centrifugal pump with a fixed axis

Non-Patent Citations (1)

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Title
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Also Published As

Publication number Publication date
WO2013189571A1 (en) 2013-12-27
EP2864640A1 (en) 2015-04-29
CN104411977B (en) 2018-02-23
CN104411977A (en) 2015-03-11
DE102012012443A1 (en) 2013-12-24

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