EP0308372A1 - Circulation pump, particularly for hot water systems - Google Patents

Circulation pump, particularly for hot water systems Download PDF

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Publication number
EP0308372A1
EP0308372A1 EP88810614A EP88810614A EP0308372A1 EP 0308372 A1 EP0308372 A1 EP 0308372A1 EP 88810614 A EP88810614 A EP 88810614A EP 88810614 A EP88810614 A EP 88810614A EP 0308372 A1 EP0308372 A1 EP 0308372A1
Authority
EP
European Patent Office
Prior art keywords
shaft
bearing bush
rotor
circulation pump
bearing
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
EP88810614A
Other languages
German (de)
French (fr)
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EP0308372B1 (en
Inventor
Paul Akerman
Wolfram Meyer
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.)
Bieri Pumpenbau AG
Original Assignee
Bieri Pumpenbau AG
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
Application filed by Bieri Pumpenbau AG filed Critical Bieri Pumpenbau AG
Priority to AT88810614T priority Critical patent/ATE62325T1/en
Publication of EP0308372A1 publication Critical patent/EP0308372A1/en
Application granted granted Critical
Publication of EP0308372B1 publication Critical patent/EP0308372B1/en
Anticipated expiration legal-status Critical
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
    • 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
    • F04D13/064—Details of the magnetic circuit
    • 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
    • F04D13/0633—Details of the bearings

Definitions

  • the present invention relates to a circulation pump, in particular for hot water systems, according to the preamble of independent claim 1.
  • the circulation pump 1 comprises a pump housing 2 and a shaft 5 with a rotor 6, which is mounted centrally in the housing in bearing bushes 3 and 4, and has a rotor 6. -weg arrangement 7, 8, an impeller 9 is attached to the shaft. Between the front bearing bush 3 and a part 10 of the shaft 5 which is somewhat widened in this area, two lubricating grooves 11 and 12 are partially overlapping in an area a. Two lubrication grooves 14 and 15 are also provided between the rear part 13 of the shaft 5 and the rear bearing bush 4. The front bearing bush 3 is partially arranged within a bearing cover 16. A can 17 is attached between a bracket 18 of the motor housing 24 and the rear bearing bush 4 and between the rotor 6 and a stator 19.
  • a deflection disk 20 is fitted inside the can 17, in the area between the rear bearing bush 4 and the rotor 6, which is pressed into the can 17.
  • a narrow gap 21 is provided between part of the rear region 13 of the shaft 5 and the deflection disk 20.
  • a device designed as a screw plug 27 for checking the direction of rotation serves to close off the pump on the motor side.
  • FIG. 2 shows a view according to arrow A of FIG. 1 onto the deflection plate 20 with blades 22.
  • FIG. 3 shows a section along line III-III of FIG. 1. From this FIG. It can be seen that longitudinal grooves 23 are provided between the shaft 5 and the rotor.
  • the bearing cover 16 is tight between the front bearing bush 3 and the can 17 used.
  • the water entering the rotor space through the lubrication grooves 11 and 12 after the system has been filled is carried along by the rotating rotor and carried out between the rotor and the can in the direction of the rear bearing.
  • the air compressed in the rotor space passes through the longitudinal grooves 23, 12, 11 into the space 25 between the impeller 9, the pump housing 2 and the can 17 and is carried away in the pumped heating water.
  • the shaft diameter is approximately 0.5 mm smaller than the blade inner diameter of the deflection disk 20, as a result of which a narrow gap is formed between the rear region 13 of the shaft 5 and the rear bearing bush 4.
  • the circulation pump according to the invention also has the advantage, among other things, that the engine compartment is quickly filled with material to be conveyed, and the ventilation system works over the entire range of the pump's characteristic curve.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Cookers (AREA)
  • Rotary Pumps (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)

Abstract

A bearing cap (16) is sealingly inserted between a front bearing bush (3) and a fluid-tight sleeve (17). Between a front portion (10) of a rotor shaft (5) and the front bearing bush, two overlying lubricating grooves (11, 12) are disposed. On a rear portion (13) of the shaft, a baffle plate (20) having vanes is mounted, an annular gap (21) existing between the shaft and the inside diameter of the vanes. Between the rear portion of the shaft and a rear bearing bush (4), lubricating grooves (14, 15) are formed continuously. The rotor chamber is quickly vented, no contamination thereof taking place. Lubrication and heat evacuation from the rotor chamber are ensured.

Description

Die vorliegende Erfindung bezieht sich auf eine Umwälzpumpe insbesondere für Warmwasseranlagen gemäss dem Oberbegriff des unabhängigen Patentanspruches 1.The present invention relates to a circulation pump, in particular for hot water systems, according to the preamble of independent claim 1.

Bei bekannten Umwälzpumpen, bei welchen die Welle mit dem Rotor in Lagerbüchsen aus Kohle gelagert ist, ist zwi­schen dem dem Laufrad zugewandten Ende der Welle und dem vorderen Lager ein Spiel vorhanden. Im weiteren ist zwischen dem über der vorderen Lagerbüchse, benachbart dem Laufrad, angeordneten Lagerdeckel und dem Spaltrohr ein enger Spalt vorhanden. Die Schmiernut beim in der hinteren Lagerbüchse gelagerten Ende der Welle ist nicht durchgehend ausgebildet.In known circulating pumps, in which the shaft with the rotor is supported in carbon bearing bushes, there is play between the end of the shaft facing the impeller and the front bearing. Furthermore, there is a narrow gap between the bearing cover arranged above the front bearing bush, adjacent to the impeller, and the can. The lubrication groove at the end of the shaft mounted in the rear bearing bush is not continuous.

Diese Anordnung weist den Nachteil auf, dass Verun­reinigungen vom Heizwasser in die Pumpe gelangen und zum Blockieren derselben führen können.This arrangement has the disadvantage that impurities from the heating water get into the pump and can block it.

Es ist eine Aufgabe der vorliegenden Erfindung, eine Umwälzpumpe insbesondere für Warmwasseranlagen zu schaffen, bei welcher keine Verschmutzung des Rotoraums stattfindet und eine möglichst schnelle Entlüftung erfolgt. Die Schmie­rung und die Wärmeabfuhr aus dem Rotorraum soll gewährlei­stet sein.It is an object of the present invention to provide a circulation pump, in particular for hot water systems, in which there is no contamination of the rotor space and the ventilation is as quick as possible. Lubrication and heat dissipation from the rotor chamber should be ensured.

Diese Aufgaben werden erfindungsgemäss durch die kennzeichnenden Merkmale des unabhängigen Patentanspruches 1 gelöst.According to the invention, these objects are achieved by the characterizing features of independent patent claim 1.

Bevorzugte Ausführungsformen ergeben sich aus den abhängigen Ansprüchen.Preferred embodiments result from the dependent claims.

Im folgenden wird anhand der beiliegenden Zeichnung ein Ausführungsbeispiel der Erfindung sowie dessen Verwen­dung näher beschrieben. Es zeigen:

  • Fig. 1 einen Schnitt durch die Umwälzpumpe für Warm­wasseranlagen,
  • Fig. 2 eine Ansicht A gemäss Fig. 1,
  • Fig. 3 einen Schnitt gemäss Linie III-III der Fig. 1.
An exemplary embodiment of the invention and its use are described in more detail below with reference to the accompanying drawing. Show it:
  • 1 shows a section through the circulation pump for hot water systems,
  • 2 is a view A according to FIG. 1,
  • 3 shows a section along line III-III of FIG. 1.

Die Umwälzpumpe 1 gemäss Fig. 1 umfasst ein Pumpenge­häuse 2 und eine zentrisch im Gehäuse in Lagerbüchsen 3 und 4 aus Kohle gelagerte Welle 5 mit einem Rotor 6. Im Bereich ei­ner Wasserzuführung resp. -wegführung 7, 8 ist an der Welle ein Laufrad 9 angebracht. Zwischen der vorderen Lager­büchse 3 und einem in diesem Bereich etwas verbreiterten Teil 10 der Welle 5 sind zwei sich in einem Bereich a teil­weise überlappende Schmiernuten 11 und 12 angeordnet. Zwi­schen dem hinteren Teil 13 der Welle 5 und der hinteren La­gerbüchse 4 sind ebenfalls zwei Schmiernuten 14 und 15 vor­gesehen. Die vordere Lagerbüchse 3 ist teilweise innerhalb eines Lagerdeckels 16 angeordnet. Ein Spaltrohr 17 ist zwi­schen einer Halterung 18 des Motorgehäuses 24 und der hin­teren Lagerbüchse 4 und zwischen dem Rotor 6 und einem Sta­tor 19 angebracht. Es ist im Bereich des Lagerdeckels 16 rechtwinklig abgebogen. Innerhalb des Spaltrohres 17, im Bereich zwischen der hinteren Lagerbüchse 4 und dem Rotor 6 ist eine Umlenkscheibe 20 angebracht, welche in das Spalt­rohr 17 eingepresst ist. Zwischen einem Teil des hinteren Bereichs 13 der Welle 5 und der Umlenkscheibe 20 ist ein enger Spalt 21 vorgesehen. Dem motorseitigen Abschluss der Pumpe gegen aussen dient eine als Verschlussschraube 27 ausgebildete Vorrichtung zur Drehsinnkontrolle.The circulation pump 1 according to FIG. 1 comprises a pump housing 2 and a shaft 5 with a rotor 6, which is mounted centrally in the housing in bearing bushes 3 and 4, and has a rotor 6. -wegführung 7, 8, an impeller 9 is attached to the shaft. Between the front bearing bush 3 and a part 10 of the shaft 5 which is somewhat widened in this area, two lubricating grooves 11 and 12 are partially overlapping in an area a. Two lubrication grooves 14 and 15 are also provided between the rear part 13 of the shaft 5 and the rear bearing bush 4. The front bearing bush 3 is partially arranged within a bearing cover 16. A can 17 is attached between a bracket 18 of the motor housing 24 and the rear bearing bush 4 and between the rotor 6 and a stator 19. It is bent at right angles in the area of the bearing cover 16. A deflection disk 20 is fitted inside the can 17, in the area between the rear bearing bush 4 and the rotor 6, which is pressed into the can 17. A narrow gap 21 is provided between part of the rear region 13 of the shaft 5 and the deflection disk 20. A device designed as a screw plug 27 for checking the direction of rotation serves to close off the pump on the motor side.

In Fig. 2 ist eine Ansicht gemäss dem Pfeil A der Fig. 1 auf die Umlenkscheibe 20 mit Schaufeln 22 dargestellt.FIG. 2 shows a view according to arrow A of FIG. 1 onto the deflection plate 20 with blades 22.

Fig. 3 zeigt einen Schnitt gemäss Linie III-III der Fig. 1. Aus dieser Fig. ist ersichtlich, dass zwischen der Welle 5 und dem Rotor Längsnuten 23 vorgesehen sind.FIG. 3 shows a section along line III-III of FIG. 1. From this FIG. It can be seen that longitudinal grooves 23 are provided between the shaft 5 and the rotor.

Bei der beschriebenen erfindungsgemässen Umwälzpumpe insbesondere für Warmwasseranlagen ist der Lagerdeckel 16 dicht zwischen der vorderen Lagerbüchse 3 und dem Spaltrohr 17 eingesetzt. Das nach dem Auffüllen der Anlage durch die Schmiernuten 11 und 12 in den Rotorraum gelangende Wasser wird durch den drehenden Rotor mitgenommen und zwischen Rotor und Spaltrohr in Richtung des hinteren Lagers durchge­führt. Die im Rotorraum komprimierte Luft gelangt durch die Längsnuten 23, 12, 11 in den Raum 25 zwischen Laufrad 9, Pumpengehäuse 2 und Spaltrohr 17 und wird im gepumpten Heiz­wasser weggeführt. Der Wellendurchmesser ist ca. 0,5 mm kleiner als der Schaufel-Innendurchmesser der Umlenkscheibe 20, wodurch ein enger Spalt zwischen dem hinteren Bereich 13 der Welle 5 und der hinteren Lagerbüchse 4 gebildet wird. Wichtig ist, dass die Luft rasch aus dem Rotorraum entfernt wird, da mit dem Wasser auch die Lager geschmiert werden. Nachdem die sich im Rotorraum 26 befindliche Luft abgeführt worden und dieser vollständig mit Wasser gefüllt ist, ergibt sich ein Druckgleichgewicht zwischen dem Rotorraum 26 und dem benachbarten Pumpenraum 25. Das sich nun im Rotorraum 26 befindliche Wasser verbleibt in demselben. Da kein durch Druckdifferenzen bewirkter Wasseraustausch zwischen den Räu­men 25 und 26 erfolgt, gelangt auch kein im Heizwasser ge­förderter Schmutz in die Lager 3, 4 und in den Rotorraum 26. Daneben wird der Rotorraum zu etwa 70 % durch das Wasser ge­kühlt. Die Wärmeabfuhr erfolgt über den in den Raum 25 hin­einragenden Teil des Lagerdeckels 16. Die Restwärme wird über das Motorgehäuse nach aussen abgeführt. Die Schmiernu­ten 14 und 15 zwischen dem hinteren Bereich 13 der Welle 5 und der hinteren Lagerbüchse 4 sind durchgehend ausgebildet. Es erfolgt eine einwandfreie Entlüftung auch aus dem Raum 28, ohne dass bei entfernter Verschlussschraube 27 Wasser hinten hinausspritzt.In the circulating pump according to the invention described, in particular for hot water systems, the bearing cover 16 is tight between the front bearing bush 3 and the can 17 used. The water entering the rotor space through the lubrication grooves 11 and 12 after the system has been filled is carried along by the rotating rotor and carried out between the rotor and the can in the direction of the rear bearing. The air compressed in the rotor space passes through the longitudinal grooves 23, 12, 11 into the space 25 between the impeller 9, the pump housing 2 and the can 17 and is carried away in the pumped heating water. The shaft diameter is approximately 0.5 mm smaller than the blade inner diameter of the deflection disk 20, as a result of which a narrow gap is formed between the rear region 13 of the shaft 5 and the rear bearing bush 4. It is important that the air is quickly removed from the rotor space, since the bearings are also lubricated with the water. After the air in the rotor chamber 26 has been removed and this is completely filled with water, there is a pressure equilibrium between the rotor chamber 26 and the adjacent pump chamber 25. The water now in the rotor chamber 26 remains in the same. Since there is no water exchange caused by pressure differences between the rooms 25 and 26, no dirt conveyed in the heating water reaches the bearings 3, 4 and the rotor space 26. In addition, about 70% of the rotor space is cooled by the water. The heat is dissipated via the part of the bearing cover 16 protruding into the space 25. The residual heat is dissipated to the outside via the motor housing. The lubrication grooves 14 and 15 between the rear region 13 of the shaft 5 and the rear bearing bush 4 are continuous. Flawless ventilation also takes place from room 28 without water splashing out from behind when the screw plug 27 is removed.

Die erfindungsgemässe Umwälzpumpe weist unter anderem auch den Vorteil auf, dass der Motorraum rasch mit Fördergut gefüllt wird, und das Entlüftungssystem über den ganzen Kennlinienbereich der Pumpe funktioniert.The circulation pump according to the invention also has the advantage, among other things, that the engine compartment is quickly filled with material to be conveyed, and the ventilation system works over the entire range of the pump's characteristic curve.

Claims (5)

1. Umwälzpumpe insbesondere für Warmwaseranlagen mit einem Pumpengehäuse (2), einer zwischen Lagerbüchsen (3, 4) gelagerten Welle (5, 10, 13) mit einem mit Längsnuten versehenen Rotor (6) und einem zwischen Rotor (6) und einem Stator (19) ange­ordneten Spaltrohr (17) sowie einem mit der Welle verbundenen Laufrad (9), gekennzeichnet durch mindestens eine zwischen Rotor (6) und einer Lagerbüchse (4) angeordnete Umlenkscheibe (20), wobei zwischen dem Aussendurchmesser der Welle (13) und dem In­nendurchmesser der Umlenkscheibe (20) ein Spalt vorhanden ist, und mindestens je eine in den Lagerbüchsen (3) angeordnete Schmiernut (11, 12; 14, 15).1. Circulation pump, in particular for hot water systems, with a pump housing (2), a shaft (5, 10, 13) mounted between bearing bushes (3, 4) with a rotor (6) provided with longitudinal grooves and one between rotor (6) and a stator ( 19) arranged can (17) and an impeller (9) connected to the shaft, characterized by at least one deflection disc (20) arranged between the rotor (6) and a bearing bush (4), the outer diameter of the shaft (13) and the There is a gap in the inside diameter of the deflection disk (20), and at least one lubrication groove (11, 12; 14, 15) arranged in the bearing bushes (3). 2. Umwälzpumpe nach Patentanspruch 1, dadurch gekenn­zeichnet, dass in der dem Laufrad (9) benachbarten Lagerbüchse (3) zwei nicht durchgehende, aber sich überlappende Schmiernuten (11, 12) vorgesehen sind.2. Circulation pump according to claim 1, characterized in that two non-continuous but overlapping lubrication grooves (11, 12) are provided in the bearing bush (3) adjacent to the impeller (9). 3. Umwälzpumpe nach einem der vorangehenden Patentan­sprüche, dadurch gekennzeichnet, dass ein zwischen der dem Laufrad (9) benachbarten Lagerbüchse (3) und dem Spaltrohr (17) angebrachter Lagerdeckel (16) dicht zwischen Lagerbüchse (3) und Spaltrohr (17) eingesetzt ist.3. Circulation pump according to one of the preceding claims, characterized in that between the bearing wheel (9) adjacent bearing bush (3) and the can (17) attached bearing cover (16) is inserted tightly between the bearing bush (3) and the can (17) . 4. Umwälzpumpe nach einem der vorangehenden Patentan­sprüche, dadurch gekennzeichnet, dass zwischen dem dem Laufrad (9) entgegengesetzten hinteren Bereich (13) der Welle (5) und der hinteren Lagerbüchse (4) mindestens zwei durchgehende Schmiernuten (14, 15) angeordnet sind.4. Circulation pump according to one of the preceding claims, characterized in that at least two continuous lubrication grooves (14, 15) are arranged between the rear region (13) of the shaft (5) and the rear bearing bush (4) opposite the impeller (9). 5. Umwälzpumpe nach einem der vorangehenden Patentan­sprüche, dadurch gekennzeichnet, dass die Umlenkscheibe (20) mit Schaufeln (22) versehen ist.5. Circulation pump according to one of the preceding claims, characterized in that the deflection plate (20) is provided with blades (22).
EP88810614A 1987-09-15 1988-09-12 Circulation pump, particularly for hot water systems Expired - Lifetime EP0308372B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88810614T ATE62325T1 (en) 1987-09-15 1988-09-12 CIRCULATION PUMP ESPECIALLY FOR HOT WATER SYSTEMS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH3553/87 1987-09-15
CH355387 1987-09-15

Publications (2)

Publication Number Publication Date
EP0308372A1 true EP0308372A1 (en) 1989-03-22
EP0308372B1 EP0308372B1 (en) 1991-04-03

Family

ID=4258472

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88810614A Expired - Lifetime EP0308372B1 (en) 1987-09-15 1988-09-12 Circulation pump, particularly for hot water systems

Country Status (5)

Country Link
US (1) US4878804A (en)
EP (1) EP0308372B1 (en)
AT (1) ATE62325T1 (en)
DD (1) DD282496A5 (en)
DE (1) DE3862268D1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1719914A3 (en) * 2000-05-22 2006-11-15 ITT Manufacturing Enterprises, Inc. Centrifugal pump with magnetic coupling
LU102208B1 (en) * 2020-11-13 2022-05-17 Wilo Se Self-venting wet rotor pump

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US5604777A (en) * 1995-03-13 1997-02-18 Westinghouse Electric Corporation Nuclear reactor coolant pump
DE19822704B4 (en) * 1998-05-20 2007-01-11 Laing, Oliver Gas-separating process water circulation pump
US6082976A (en) * 1998-11-18 2000-07-04 Grundfos Manufacturing Corporation Circulating pump
DE19904148C1 (en) * 1999-02-03 2000-10-12 Pierburg Ag Electric feed pump
DE10152497A1 (en) * 2001-10-24 2003-05-15 Pierburg Gmbh Wet rotor
EP2620228B1 (en) 2008-11-14 2017-05-31 Alfred Kärcher GmbH & Co. KG High pressure cleaning device
DE102009010461A1 (en) 2009-02-13 2010-08-19 Alfred Kärcher Gmbh & Co. Kg Motor pump unit
ES2461840T3 (en) * 2009-02-13 2014-05-21 Alfred Kärcher Gmbh & Co. Kg Pump unit with motor
WO2010091698A1 (en) 2009-02-13 2010-08-19 Alfred Kärcher Gmbh & Co. Kg Motor pump unit
DE102014209140A1 (en) * 2013-05-23 2014-11-27 Robert Bosch Gmbh delivery unit
DE102014219219A1 (en) * 2014-09-24 2016-03-24 Robert Bosch Gmbh delivery unit
DE112020007863T5 (en) * 2020-12-21 2023-11-09 Pierburg Pump Technology Gmbh Electric vehicle fluid pump with particle trap
WO2024137309A1 (en) * 2022-12-22 2024-06-27 Schlumberger Technology Corporation Submersible pumping system with hermetically sealed motor

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DE1100787B (en) * 1959-01-20 1961-03-02 Poul Due Jensen Lubrication of the bearings of electric canned motors with the help of a liquid, especially for driving centrifugal pumps
DE1453792B1 (en) * 1964-09-11 1969-09-11 Klein Schanzlin & Becker Ag Device for the automatic generation of a lubricating, cooling and venting circuit for centrifugal pump units
DE1911550A1 (en) * 1969-03-07 1970-09-24 Hanning Elektro Werke Heating circulation pump
DE1956632A1 (en) * 1969-11-11 1971-05-19 Veredlung Gmbh Guss & Stahl Canned motor centrifugal pump unit
DE2639540A1 (en) * 1976-09-02 1978-03-09 Grundfos As Plain bearing sleeve for circulation pump shafts - has diametrically opposite overlapping grooves for access of liquid for lubricating

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Publication number Priority date Publication date Assignee Title
DE1100787B (en) * 1959-01-20 1961-03-02 Poul Due Jensen Lubrication of the bearings of electric canned motors with the help of a liquid, especially for driving centrifugal pumps
DE1453792B1 (en) * 1964-09-11 1969-09-11 Klein Schanzlin & Becker Ag Device for the automatic generation of a lubricating, cooling and venting circuit for centrifugal pump units
DE1911550A1 (en) * 1969-03-07 1970-09-24 Hanning Elektro Werke Heating circulation pump
DE1956632A1 (en) * 1969-11-11 1971-05-19 Veredlung Gmbh Guss & Stahl Canned motor centrifugal pump unit
DE2639540A1 (en) * 1976-09-02 1978-03-09 Grundfos As Plain bearing sleeve for circulation pump shafts - has diametrically opposite overlapping grooves for access of liquid for lubricating

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1719914A3 (en) * 2000-05-22 2006-11-15 ITT Manufacturing Enterprises, Inc. Centrifugal pump with magnetic coupling
LU102208B1 (en) * 2020-11-13 2022-05-17 Wilo Se Self-venting wet rotor pump
EP4001654A1 (en) * 2020-11-13 2022-05-25 Wilo Se Self-ventilating wet rotor pump

Also Published As

Publication number Publication date
DE3862268D1 (en) 1991-05-08
EP0308372B1 (en) 1991-04-03
US4878804A (en) 1989-11-07
DD282496A5 (en) 1990-09-12
ATE62325T1 (en) 1991-04-15

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