EP0522324B2 - Pumping assembly made of a flow machine and drive motor - Google Patents

Pumping assembly made of a flow machine and drive motor Download PDF

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Publication number
EP0522324B2
EP0522324B2 EP92110180A EP92110180A EP0522324B2 EP 0522324 B2 EP0522324 B2 EP 0522324B2 EP 92110180 A EP92110180 A EP 92110180A EP 92110180 A EP92110180 A EP 92110180A EP 0522324 B2 EP0522324 B2 EP 0522324B2
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EP
European Patent Office
Prior art keywords
housing
bayonet
annular body
drive motor
flow machine
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
EP92110180A
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German (de)
French (fr)
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EP0522324B1 (en
EP0522324A1 (en
Inventor
Niels Due Jensen
Kurt Frank Nielsen
Kurt B. Espensen
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Grundfos AS
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Grundfos AS
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Classifications

    • 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
    • F04D29/40Casings; Connections of working fluid
    • F04D29/42Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/44Fluid-guiding means, e.g. diffusers
    • F04D29/445Fluid-guiding means, e.g. diffusers especially adapted for liquid pumps
    • 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
    • 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
    • F04D29/08Sealings
    • F04D29/086Sealings especially adapted for liquid pumps
    • 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
    • F04D29/60Mounting; Assembling; Disassembling
    • F04D29/62Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps
    • F04D29/624Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
    • F04D29/626Mounting or removal of fans
    • 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
    • F04D29/60Mounting; Assembling; Disassembling
    • F04D29/62Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps
    • F04D29/628Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps especially adapted for liquid pumps
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05DINDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2260/00Function
    • F05D2260/30Retaining components in desired mutual position
    • F05D2260/33Retaining components in desired mutual position with a bayonet coupling

Definitions

  • the invention is based on a conveyor unit according to the preamble of claims 1 and 2.
  • Such a delivery unit is in DE-PS 32 20 448.
  • DE-PS 36 09 311 is a similar as Submersible delivery unit described.
  • the end shield for the front Shaft bearings of the drive motor on the one hand a cover and on the other hand with a outer unit housing often screwed.
  • the encapsulated stator of the drive motor for Formation of a flow annulus with radial Distance surrounds.
  • the end cover serves as Partition to the pump room, has a flow passage and at the same time forms a peripheral wall for the connected centrifugal pump out. Two further covers form the outer end the centrifugal pump, all of which are mentioned Cover by a variety of screws with the Unit housing are connected.
  • DE-A-19 59 087 is an electric drive motor and centrifugal pump described existing delivery unit, at which the housing of the two machines using a simple and conventional bayonet training releasably connected are.
  • the unit according to this document is in the pump Motor flange a stationary end shield for the front Motor shaft bearings are provided, the motor shaft in the pump housing protrudes to support the pump impeller there.
  • At this unit must be at least a cumbersome one and time-consuming disassembly and reassembly of the running gear from the engine interior at least on the engine side with the help of Tools are done when an internal cleaning of the whole Conveyor unit including the running machine is required. Only the two housing parts of the units are twisted easy to disassemble and reassemble. A non-specialist is therefore responsible for performing the engine side internal aggregate cleaning faced considerable problems. The risk of improper dismantling and reassembly the unit is therefore particularly large.
  • the object of the invention is Conveyor unit of the type mentioned above to improve that the conveyor unit for maintenance purposes even by untrained staff disassembled without screwdriver and again can be mounted and that the conveyor unit structurally simplified and with lower manufacturing costs can be produced.
  • the conveyor unit according to the invention is due of its bayonet connections to each other parts of the end shield to be connected, the housing of the drive motor and the pump or a fan without using a tool disassembled by untrained users and reassembled. There can be none Screw parts are lost and a wrong one. Reassembly is also excluded.
  • the invention is particularly advantageous in centrifugal pumps, especially with fountain and Drainage pumps, can be used. But also fans and blowers can replace the centrifugal pumps be provided.
  • FIG 1 is a generally designated 1 Conveying unit shown, which results from a fluid flow machine in the form of a centrifugal pump 2 and an electric drive motor 3 composed.
  • the pump 2 consists of a housing 4 and one or more 2 Wheels 5.
  • the wheel or wheels are on one Fixed shaft 6 of motor 3, the shaft via a front slide bearing 7 in a bearing plate 8 is held, which in turn partially in one Canned can pot 9 of the motor 3 engages.
  • the rear The end of the shaft 6 is in a known manner in one Plain bearings mounted, this bearing on the canned pot is held (not shown).
  • the canned pot 9 has a radial Flange 10, the outer circumferential end with a crank 11 and provided with a housing 12 aes electric motor 3 is connected.
  • a radial Flange 10 of the canned pot 9 is a one-piece Ring body 13 in the form of a substantially flat sheet metal part firmly connected, e.g. by welding points provided in an annular zone 14 14a, as indicated in Figure 3.
  • the ring body 13 is the ring body 13 in Area of its inner circumference also with a Crank 15 fitted. Through the cranks 11 and 15 receiving spaces for bayonet parts are formed as it becomes clear.
  • the ring body 13 has both on its inner circumference as well as one on its outer circumference proportionate bayonet training 16 or 17.
  • the each corresponding other proportional bayonet training 18 and 19 are on the end shield 8 or provided on the pump housing 4.
  • the bearing plate 8 and that Pump housing 4 together by means of the ring body 13 releasably attached to the motor housing 12.
  • bayonet connections can be done in such a way that these are additionally provided with locking means that are indicated schematically at 20 in FIG. How shown, these locking means from small projections on the bayonet parts 16 and corresponding Wells in the corresponding bayonet parts 18 exist.
  • locking means from small projections on the bayonet parts 16 and corresponding Wells in the corresponding bayonet parts 18 exist.
  • Latching means also on all other bayonet parts be provided; however, they are for space reasons Not shown.
  • the generally designated 21 further conveyor unit 4 consists of an engine 22 with a housing 23, from a centrifugal pump 24 and from an assembly housing 25, which with a radial distance to the motor housing 23 is provided. This is an annular space 26 trained, which is fed by the pump 24. At the unit housing 25 is an inlet housing below 27 detachably attached.
  • Such a conveyor unit is used as a submersible pump for drainage purposes used and e.g. stand upright held in the medium to be removed. where it is last with the housing 27 on a floor surface supports.
  • the ring body 13 is on the motor housing 23 e.g. fixed by welding and has an internal bayonet formation 28 and an external bayonet formation 29.
  • the inner bayonet training 28 works the corresponding bayonet formation of the end shield 8 together to the running gear on the motor housing 23 to attach.
  • the ring body 13 consists of two, essentially in the same plane Ring parts 13a, 13b.
  • the second, outer Ring part 13b in the form of, for example, a sheet metal ring is also with a on its inner circumference Bayonet training 31 provided the best can be seen from Figure 5.
  • This bayonet training 31 works with the outer bayonet formation 29 of the first ring part 13a of the ring body 13 and the motor housing 23 together, so that second ring part 13b detachably on the motor housing 23 is attachable.
  • the outer ring part is on its outer circumference 13b with the housing 32 of the pump 24 connected, e.g. by welding.
  • the pump housing 32 is opposite by means of an annular seal 33 sealed the unit housing 25.
  • the outer ring part 13b is a diffuser trained and circumferentially has several e.g. segment-shaped passages 34 (FIG. 5) on so that the impeller 5 of the pump 24th delivered fluid into the annular space 26 can from where it is in a manner known per se a connecting piece and one connected to it Line is removed.
  • segment-shaped passages 34 FIGS. 5 and 6 have proceeded in such a way that downward curved guide vanes 35 and / or upwardly curved guide vanes 36 are provided.
  • These guide vanes 35, 36 can be made so that they are from the tongue-like Sheet metal parts consist of those for training the flow passages 34 provided Zones of the ring part 13b are bent out (FIG 6).
  • the third embodiment shown in Figure 7 consists of a generally designated 37 Conveyor 37. that a fan or a blower is.
  • a one-piece Ring body 38 provided with the housing 39 of the fan 40 is firmly connected. e.g. by Spot welds.
  • an outer, generally with The designated bayonet design is the housing 42 of the electric motor 43 on the housing 39 the fan 40 attached.
  • the end shield 45 With an inner, general with 44 bayonet training of the Ring body 38 is the end shield 45 with the Ring body 38 and the fan housing 39 connected.
  • the end shield 45 carries the other hand front bearing 46 for the motor shaft 47.
  • the shaft 47 in turn carries on the fan 40 facing End of the fan wheel 48 and is on hers rear end in the usual way in another Slide bearing 49 stored.
  • Figure 8 shows a modified embodiment to the example in Figure 4.
  • the Ring body 13 from a one-piece flat Sheet metal part with a first bayonet formation 51 on its inner circumference and a second bayonet formation 52 on its outer circumference.
  • a wide-ring zone provided an inner peripheral area 53 for fastening the ring body 13 on the motor housing 23 and an outer peripheral region 54 for the formation of a guide apparatus for loading the flow annulus 26 of the submersible pump.
  • the guide is preferably formed as it is in connection is described with Figures 4.5 and 6.
  • the outer, protruding shaped bayonet formation 52 of the ring body 13 engages accordingly usual groove design of the pump housing 32.

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

Description

Die Erfindung geht aus von einem Förderaggregat gemäß dem Oberbegriff der Patentansprüche 1 und 2.The invention is based on a conveyor unit according to the preamble of claims 1 and 2.

Ein solches Förderaggregat ist in der DE-PS 32 20 448 beschrieben. Hierbei ist der Lagerschild für das vordere Wellenlager des Antriebsmotors mit dessen in diesem Bereich als radialer Flansch ausgebildeten Spaltrohr. das wiederum mit dem Motorgehäuse fest verbunden ist, verschweißt. Des weiteren ist auch das Gehäuse der Strömungsarbeitsmaschine in Form einer Kreiselpumpe mit dem genannten Flansch des Spaltrohres unlösbar verbunden.Such a delivery unit is in DE-PS 32 20 448. Here is the end shield for the front shaft bearing of the drive motor with its radial flange in this area trained can. that again with the Motor housing is firmly connected, welded. Of Another is the housing of the fluid flow machine in the form of a centrifugal pump the flange of the canned tube cannot be detached connected.

In der DE-PS 36 09 311 ist ein ähnliches, als Tauchpumpe ausgebildetes Förderaggregat beschrieben. Hierbei ist der Lagerschild für das vordere Wellen lager des Antriebsmotors einerseits mit einem Abschlußdeckel und andererseits mit einem äußeren Aggregatgehäuse vielfach verschraubt. das den gekapselten Stator des Antriebsmotors zur Ausbildung eines Strömungsringraumes mit radialem Abstand umgibt. Der Abschlußdeckel dient als Trennwand zum Pumpenraum, weist einen Strömungsdurchlaß auf und bildet gleichzeitig eine Umfangswand für die angeschlossene Kreiselpumpe aus. Zwei weitere Deckel bilden den äußeren Abschluß der Kreiselpumpe, wobei alle genannten Deckel durch eine Vielzahl von Schrauben mit dem Aggregatgehäuse verbunden sind.In DE-PS 36 09 311 is a similar as Submersible delivery unit described. Here is the end shield for the front Shaft bearings of the drive motor on the one hand a cover and on the other hand with a outer unit housing often screwed. the encapsulated stator of the drive motor for Formation of a flow annulus with radial Distance surrounds. The end cover serves as Partition to the pump room, has a flow passage and at the same time forms a peripheral wall for the connected centrifugal pump out. Two further covers form the outer end the centrifugal pump, all of which are mentioned Cover by a variety of screws with the Unit housing are connected.

In der DE-A-19 59 087 ist ein aus elektrischem Antriebsmotor und Kreiselpumpe bestehendes Förderaggregat beschrieben, bei dem die Gehäuse der beiden Maschinen mittels einer einfachen und üblichen Bajonettausbildung lösbar miteinander verbunden sind. Bei dem Aggregat nach dieser Druckschrift ist im pumpenseitigen Motorflansch ein ortsfester Lagerschild für das vordere Motorwellenlager vorgesehen, wobei die Motorwelle in das Pumpengehäuse hineinragt, um dort das Pumpenlaufrad zu trägen. Bei diesem Aggregat muß in jedem Fall zumindest eine umständliche und zeitraubende Demontage und Wiedermontage des Laufzeuges aus dem Aggregatinneren wenigstens motorseitig mit Hilfe von Werkzeugen erfolgen, wenn eine innere Reinigung des gesamten Förderaggregates einschließlich des Laufzeuges erforderlich ist. Lediglich die beiden Gehäuseteile der Aggregate sind durch Verdrehung auf einfache Weise demontierbar und wiedermontierbar. Ein Nichtfachmann ist daher bei der Durchführung der motorseitig inneren Aggregatreinigung vor erhebliche Probleme gestellt. Die Gefahr der nicht sachgerechten Demontage und Wiedermontage des Aggregates ist somit besonders groß.In DE-A-19 59 087 is an electric drive motor and centrifugal pump described existing delivery unit, at which the housing of the two machines using a simple and conventional bayonet training releasably connected are. In the unit according to this document is in the pump Motor flange a stationary end shield for the front Motor shaft bearings are provided, the motor shaft in the pump housing protrudes to support the pump impeller there. At this unit must be at least a cumbersome one and time-consuming disassembly and reassembly of the running gear from the engine interior at least on the engine side with the help of Tools are done when an internal cleaning of the whole Conveyor unit including the running machine is required. Only the two housing parts of the units are twisted easy to disassemble and reassemble. A non-specialist is therefore responsible for performing the engine side internal aggregate cleaning faced considerable problems. The risk of improper dismantling and reassembly the unit is therefore particularly large.

Werden diese Förderaggregate zur Förderung von verunreinigten Fördermedien verwendet, z.B. als Springbrunnenpumpe oder als Entwässerungspumpen, so können die Förderaggregate durch Verschmutzung in ihrer Leistung stark gemindert oder aufgrund der Schmutzpartikel drehblockiert sein. In diesem Fall müssen der Pumpenraum und/oder der Rotorraum gereinigt werden. In dem Fall, wo das Motorgehäuse und das Pumpengehäuse unlösbar miteinander verbunden sind. ist eine Reinigung ohne Zerstörung der betreffenden Verbindungsstelle nicht möglich. In dem Fall, wo die beiden fraglichen Gehäuse und weitere Teile miteinander verschraubt sind, müssen die betreffenden Pumpenteile und Motorteile unter zur Hilfenahme von Schraubwerkzeugen demontiert und wieder montiert werden. Das ist umständlich und zeitraubend. Da derartige Förderaggregate in der Regel von ungeschultem Personal benutzt werden. besteht die Gefahr, daß Schrauben verlorengehen und/oder die Wiedermontage fehlerhaft erfolgt, so daß eine sichere Funktion des Förderaggregates dann nicht mehr gewährleistet ist. Ein weiterer Nachteil besteht darin, daß Schraubverbindungskonstruktionen in der Fertigung relativ aufwendig sind und somit höhere Herstellungskosten bedingen.Are these funding units for funding of contaminated fluids, e.g. as a fountain pump or as a drainage pump, so the conveying units can Pollution severely reduced in performance or blocked due to the dirt particles be. In this case, the pump room and / or the rotor space can be cleaned. By doing Case where the motor housing and the pump housing are inextricably linked. is cleaning without destroying the concerned Junction not possible. In the case where the two cases in question and other parts are screwed together, the concerned Pump parts and motor parts under to help disassembled from screwing tools and be reassembled. This is cumbersome and time consuming. Since such conveyor units in the Usually used by untrained personnel. there is a risk that screws will be lost and / or the reassembly is incorrect, so that a safe function of the conveyor unit is no longer guaranteed. Another Disadvantage is that screw connection designs relatively complex to manufacture are and therefore involve higher manufacturing costs.

Die Aufgabe der Erfindung besteht darin ein Förderaggregat der einleitend angeführten Art so zu verbessern, daß das Förderaggregat zu Wartungszwecken auch von ungeschultem Personal ohne Schraubwerkzeugeinsatz demontiert und wieder montiert werden kann und daß das Förderaggregat baulich vereinfacht und mit geringeren Fertigungskosten herstellbar ist.The object of the invention is Conveyor unit of the type mentioned above to improve that the conveyor unit for maintenance purposes even by untrained staff disassembled without screwdriver and again can be mounted and that the conveyor unit structurally simplified and with lower manufacturing costs can be produced.

Die Lösung dieser Aufgabe ist in den Patentansprüchen 1 und 2 angegeben.The solution to this problem is in the claims 1 and 2 specified.

Bevor ugte Ausführungsformen des erfindungsgemäßen Förderaggregates sind in den Unteransprüchen angeführt.Before ugte embodiments of the invention Conveying units are in the subclaims cited.

Das erfindungsgemäße Förderaggregat ist aufgrund seiner Bajonettverbindungen an den miteinander zu verbindenden Teilen des Lagerschildes, der Gehäuse des Antriebsmotors und der Pumpe oder auch eines Lüfters ohne Verwendung eines Werkzeuges von ungeschulten Benutzern demontierbar und wiedermontierbar. Es können hierbei keine Schraubenteile verlorengehen und eine falsche. Wiedermontage ist ebenfalls ausgeschlossen. Ein Herausnehmen und Einsetzen des sogenannten Laufzeuges, also des Motorrotors mitsamt dem Laufrad und des vorderen Lagerschildes. zu Reinigungszwecken ist leicht und schnell möglich, da die Bajonettverbindung der betreffenden Teile durch von Hand erfolgende Drehung der zu demontierenden und wieder zu montierenden Bauteilgruppen ohne weiteres lösbar und wieder zusammensetzbar sind. Ein weiterer Vorteil ist durch die Bajonettverbindungen auch dadurch gegeben, daß ein Verziehen des Laufzeuges bei der Wiedermontage aufgrund von ungleich angezogenen Schrauben wegen deren Fehlens nicht mehr möglich ist. Dadurch sind wiederum Kantenpressungen in den Lagern der Motorwelle vermieden. Wegen des Wegfalls von platzraubenden Schraubverbindungen an den hier in Rede stehenden Stellen ist das Förderaggregat baulich einfacher gestaltet, denn bei Verwendung von Blechteilen müssen für die Gewindelöcher besondere Naben oder äquivalente Bauteile vorgesehen sein, damit die Schrauben einen festen Halt haben. Da ferner der erfindungsgemäße Ringkörper mit den anteiligen Bajonettausbildungen platzsparend und einfach hergestellt werden kann, ist das erfindungsgemäße Förderaggregat insgesamt mit erheblich billigeren Kosten herstellbar.The conveyor unit according to the invention is due of its bayonet connections to each other parts of the end shield to be connected, the housing of the drive motor and the pump or a fan without using a tool disassembled by untrained users and reassembled. There can be none Screw parts are lost and a wrong one. Reassembly is also excluded. A Take out and insert the so-called Running gear, i.e. the motor rotor together with that Impeller and the front end shield. for cleaning purposes is easily and quickly possible there the bayonet connection of the parts in question by turning the parts to be dismantled by hand and component groups to be reassembled easily detachable and again can be put together. Another advantage is that Bayonet connections also given that warping of the running gear during reassembly due to unevenly tightened screws because of their absence is no longer possible. This in turn causes edge pressures in the Bearings of the motor shaft avoided. Because of the Eliminate bulky screw connections at the points in question here it is Conveyor unit structurally simpler, because when using sheet metal parts for the Threaded holes special hubs or equivalent Components are provided so that the screws have a firm hold. Furthermore, since the invention Ring body with the proportionate bayonet formations space-saving and easy to manufacture can, is the conveyor unit according to the invention can be produced overall with significantly cheaper costs.

Die Erfindung ist besonders vorteilhaft bei Kreiselpumpen, insbesondere bei Springbrunnen- und Entwässerungspumpen, einsetzbar. Aber auch Lüfter und Gebläse können anstelle der Kreiselpumpen vorgesehen sein.The invention is particularly advantageous in centrifugal pumps, especially with fountain and Drainage pumps, can be used. But also fans and blowers can replace the centrifugal pumps be provided.

Die Erfindung ist nachstehend anhand mehrerer, in den anliegenden Zeichnungen dargestellter Ausführungsbeispiele näher erläutert. Es zeigen:

Figur 1
ein erstes Ausführungsbeispiel in teilweiser Schnittdarstellung und in teilweiser Ansicht,
Figur 2
eine vergrößerte Schnittdarstellung der Einzelheit X in Figur 1,
Figur 3
eine Ansicht auf ein erfindungsgemäßes Einzelteil,
Figur 4
ein zweites Ausführungsbeispiel, im wesentlichen in axialer Schnittdarstellung,
Figur 5
eine Ansicht auf ein Einzelteil der Ausführunqsform nach Figur 4,
Figur 6
eine Schnittdarstellung nach der Linie VI-VI in Figur 5,
Figur 7
ein drittes Ausführungsbeispiel im Axialschnitt,
Figur 8
ein viertes, gegenüber demjenigen in Figur 4 abgeändertes Ausführungsbeispiel.
The invention is explained in more detail below with reference to several exemplary embodiments shown in the accompanying drawings. Show it:
Figure 1
1 shows a first exemplary embodiment in a partial sectional view and in a partial view,
Figure 2
2 shows an enlarged sectional illustration of the detail X in FIG. 1,
Figure 3
a view of an individual part according to the invention,
Figure 4
a second embodiment, essentially in an axial sectional view,
Figure 5
3 shows a view of an individual part of the embodiment according to FIG. 4,
Figure 6
5 shows a sectional illustration along the line VI-VI in FIG. 5,
Figure 7
a third embodiment in axial section,
Figure 8
a fourth, modified from that in Figure 4 embodiment.

In Figur 1 ist ein allgemein mit 1 bezeichnetes Förderaggregat gezeigt, das sich aus einer Strömungsarbeitsmaschine in Form einer Kreiselpumpe 2 und aus einem elektrischen Antriebsmotor 3 zusammensetzt. Die Pumpe 2 besteht aus einem Gehäuse 4 und aus einem oder mehreren 2 Laufrädern 5. Das oder die Laufräder sind auf einer Welle 6 des Motors 3 befestigt, wobei die Welle über ein vorderes Gleitlager 7 in einem Lagerschild 8 gehalten ist, der wiederum teilweise in einen Spaltrohrtopf 9 des Motors 3 eingreift. Das hintere Ende der Welle 6 ist in bekannter Weise in einem Gleitlager gelagert, wobei dieses Lager am Spaltrohrtopf gehaltert ist (nicht gezeigt).In Figure 1 is a generally designated 1 Conveying unit shown, which results from a fluid flow machine in the form of a centrifugal pump 2 and an electric drive motor 3 composed. The pump 2 consists of a housing 4 and one or more 2 Wheels 5. The wheel or wheels are on one Fixed shaft 6 of motor 3, the shaft via a front slide bearing 7 in a bearing plate 8 is held, which in turn partially in one Canned can pot 9 of the motor 3 engages. The rear The end of the shaft 6 is in a known manner in one Plain bearings mounted, this bearing on the canned pot is held (not shown).

Der Spaltrohrtopf 9 weist einen radialen Flansch 10 auf, dessen äußeres Umfangsende mit einer Kröpfung 11 versehen und mit einem Gehäuse 12 aes elektrischen Motors 3 verbunden ist. Mit dem Flansch 10 des Spaltrohrtopfes 9 ist ein einteiliger Ringkörper 13 in Form eines im wesentlichen flächigen Blechteiles fest verbunden, z.B. durch in einer Ringzone 14 vorgesehene Schweißpunkte 14a, wie es in Figur 3 angegeben ist. Wie man aus Figur 2 erkennt. ist der Ringkörper 13 im Bereich seines Innenumfanges ebenfalls mit einer Kröpfung 15 ausgestattet. Durch die Kröpfungen 11 und 15 werden Aufnahmeräume für Bajonetteile ausgebildet wie noch klar wird.The canned pot 9 has a radial Flange 10, the outer circumferential end with a crank 11 and provided with a housing 12 aes electric motor 3 is connected. With the flange 10 of the canned pot 9 is a one-piece Ring body 13 in the form of a substantially flat sheet metal part firmly connected, e.g. by welding points provided in an annular zone 14 14a, as indicated in Figure 3. How can be seen from Figure 2. is the ring body 13 in Area of its inner circumference also with a Crank 15 fitted. Through the cranks 11 and 15 receiving spaces for bayonet parts are formed as it becomes clear.

Wie es am besten aus Figur 3 zu erkennen ist, weist der Ringkörper 13 sowohl an seinem Innenumfang als auch an seinem Außenumfang je eine anteilige Bajonettausbildung 16 bzw. 17 auf. Die jeweils entsprechenden anderen anteiligen Bajonettausbildungen 18 und 19 sind an dem Lagerschild 8 bzw. am Pumpengehäuse 4 vorgesehen. Man erkennt bei Betrachtung der Figuren 2 und 3 zweifelsfrei. wie die jeweiligen Bajonettausbildungen 16,18 bzw. 17,19 in Verbindung mit den Kröpfungen 11,15 paarweise zusammenwirken. Auf diese Weise sind der Lagerschild 8 und das Pumpengenhäuse 4 mittels des Ringkörpers 13 gemeinsam am Motorgehäuse 12 lösbar befestigt.As can best be seen from Figure 3, the ring body 13 has both on its inner circumference as well as one on its outer circumference proportionate bayonet training 16 or 17. The each corresponding other proportional bayonet training 18 and 19 are on the end shield 8 or provided on the pump housing 4. One can see when looking at FIGS. 2 and 3 beyond any doubt. like the respective bayonet training 16.18 and 17.19 in connection with the cranks 11.15 interact in pairs. In this way, the bearing plate 8 and that Pump housing 4 together by means of the ring body 13 releasably attached to the motor housing 12.

Indem nun auf Figur 1 Bezug genommen wird, ist leicht zu erkennen, wie eine Demontage und Wiedermontage des Förderaggregates 1 zwecks deren Reinigung vorgenommen werden kann. Man braucht nur das Pumpengehäuse 4 gegenüber dem Motorgehäuse 12 zu verdrehen, um die betreffende äußere Bajonett Verbindung 17,19 zu trennen, so daß das Pumpengehäuse 4 dann abgenommen werden kann, so daß das Pumpenlaufrad freiliegt, das nun schon abgezogen und gereinigt werden kann. Es wird dann das Motorgehäuse 12 festgehalten und anschließend der Lagerschild 8 an schematisch angedeuteten Handhaben 8a erfaßt und verdreht, so daß dadurch die innere Bajonettverbindung 16,18 gelöst wird. Es kann dann als Einheit das gesamte Laufzeug, d.h. die Welle 6 zusammen mit dem Laufrad 5 und dem nicht gezeigten Rotor des Motors 3 aus dem übrigen Motor 3 herausgezogen werden. Es erfolgt dann der Reinigungsvorgang. Anschließend werden sämtliche Aggregatgruppen in umgekehrter Reihefolge wieder montiert.Referring now to Figure 1, is easy to see how disassembly and Reassembly of the conveyor unit 1 for the purpose whose cleaning can be done. Man only needs the pump housing 4 opposite to rotate the motor housing 12 to the relevant to separate the outer bayonet connection 17, 19 so that the pump housing 4 is then removed can be so that the pump impeller exposed, which has now been removed and cleaned can be. It then becomes the motor housing 12 and then the bearing plate 8 schematically indicated handles 8a detected and twisted, so that the inner bayonet connection 16.18 is resolved. It can then be used as Unit the entire running gear, i.e. the wave 6 together with the impeller 5 and the one not shown Rotor of motor 3 from the rest of the motor 3 are pulled out. The cleaning process then takes place. Then all Aggregate groups in reverse order again assembled.

In einer ergänzten Ausgestaltung der Bajonettverbindungen kann so vorgegangen werden, daß diese zusätzlich mit Rastmitteln versehen sind, die in Figur 2 schematisch mit 20 angedeutet sind. Wie gezeigt, können diese Rastmittel aus kleinen Vorsprüngen an den Bajonetteilen 16 und entsprechenden Vertiefungen in den zugehörigen Bajonetteilen 18 bestehen. Selbstverständlich können solche Rastmittel auch an allen anderen Bajonetteilen vorgesehen sein; sie sind jedoch aus Platzgründen nicht gezeigt.In an expanded version of the bayonet connections can be done in such a way that these are additionally provided with locking means that are indicated schematically at 20 in FIG. How shown, these locking means from small projections on the bayonet parts 16 and corresponding Wells in the corresponding bayonet parts 18 exist. Of course, such Latching means also on all other bayonet parts be provided; however, they are for space reasons Not shown.

Das allgemein mit 21 bezeichnete weitere Förderaggregat gemäß Figur 4besteht aus einem Motor 22 mit einem Gehäuse 23, aus einer Kreiselpumpe 24 und aus einem Aggregatgehäuse 25, welches mit radialem Abstand zum Motorgehäuse 23 vorgesehen ist. Dadurch ist ein Ringraum 26 ausgebildet, der von der Pumpe 24 beschickt wird. An dem Aggregatgehäuse 25 ist unten ein Einlaßgehäuse 27 abnehmbar befestigt. Ein solches Förderaggregat wird als Tauchpumpe zu Entwässerungszwecken verwendet und z.B. aufrechtstehend in das abzufördernde Medium gehalten. wo es sich zuletzt mit dem Gehäuse 27 auf einer Bodenfläche abstützt.The generally designated 21 further conveyor unit 4 consists of an engine 22 with a housing 23, from a centrifugal pump 24 and from an assembly housing 25, which with a radial distance to the motor housing 23 is provided. This is an annular space 26 trained, which is fed by the pump 24. At the unit housing 25 is an inlet housing below 27 detachably attached. Such a conveyor unit is used as a submersible pump for drainage purposes used and e.g. stand upright held in the medium to be removed. where it is last with the housing 27 on a floor surface supports.

Auch in diesem Fall ist der Ringkörper 13 an dem Motorgehäuse 23 z.B, durch Schweißung befestigt und besitzt eine innere Bajonettausbildung 28 und eine äußere Bajonettausbildung 29. Mit der inneren Bajonettausbildung 28 arbeitet wiederum die entsprechende Bajonettausbildung des Lagerschildes 8 zusammen, um das Laufzeug am Motorgehäuse 23 zu befestigen. In vorteilhafter Weitergestaltung des Ringkörpers 13 besteht dieser aus zwei, im wesentlichen in gemeinsamer Ebene liegenden Ringteilen 13a,13b. Das zweite, äußere Ringteil 13b in Form beispielsweise eines Blechringes ist an seinem Innenumfang ebenfalls mit einer Bajonettausbildung 31 versehen, die am besten aus Figur 5 zu erkennen ist. Diese Bajonettausbildung 31 wirkt mit der äußeren Bajonettausbildung 29 des ersten Ringteiles 13a des Ringkörpers 13 und dem Motorgehäuse 23 zusammen, so daß das zweite Ringteil 13b am Motorgehäuse 23 lösbar befestigbar ist.In this case too, the ring body 13 is on the motor housing 23 e.g. fixed by welding and has an internal bayonet formation 28 and an external bayonet formation 29. With the inner bayonet training 28 in turn works the corresponding bayonet formation of the end shield 8 together to the running gear on the motor housing 23 to attach. In an advantageous further development the ring body 13 consists of two, essentially in the same plane Ring parts 13a, 13b. The second, outer Ring part 13b in the form of, for example, a sheet metal ring is also with a on its inner circumference Bayonet training 31 provided the best can be seen from Figure 5. This bayonet training 31 works with the outer bayonet formation 29 of the first ring part 13a of the ring body 13 and the motor housing 23 together, so that second ring part 13b detachably on the motor housing 23 is attachable.

An seinem Außenumfang ist das äußere Ringteil 13b mit dem Gehäuse 32 der Pumpe 24 fest verbunden, z.B. durch Schweißung. Das Pumpengehäuse 32 ist mittels einer Ringdichtung 33 gegenüber dem Aggregatgehäuse 25 abgedichtet.The outer ring part is on its outer circumference 13b with the housing 32 of the pump 24 connected, e.g. by welding. The pump housing 32 is opposite by means of an annular seal 33 sealed the unit housing 25.

Das äußere Ringteil 13b ist als Leitapparat ausgebildet und weist hierzu umfangsmäßig mehrere, z.B. segmentförmige Durchlässe 34 (Figur 5) auf, damit das von dem Laufrad 5 der Pumpe 24 geförderte Fluid in den Ringraum 26 gelangen kann, von wo es in an sich bekannter Weise über einen Anschlußstutzen und eine daran angeschlossene Leitung abgefördert wird. Zur optimalen Fluidströmung durch die Durchlässe 34 hindurch sind diesen Leitschaufeln zugeordnet. Hierzu kann gemäß den Figuren 5 und 6 so vorgegangen sein, daß nach unten gebogene Leitschaufeln 35 und/oder nach oben gebogene Leitschaufeln 36 vorgesehen sind. Diese Leitschaufeln 35,36 können so hergestellt sein, daß sie aus den zungenartigen Blechteilen bestehen, die aus den für die Ausbildung der Strömungsdurchlässe 34 vorgesehenen Zonen des Ringteiles 13b herausgebogen sind (Figur 6).The outer ring part 13b is a diffuser trained and circumferentially has several e.g. segment-shaped passages 34 (FIG. 5) on so that the impeller 5 of the pump 24th delivered fluid into the annular space 26 can from where it is in a manner known per se a connecting piece and one connected to it Line is removed. For optimal fluid flow are through the passages 34 assigned to these guide vanes. According to FIGS. 5 and 6 have proceeded in such a way that downward curved guide vanes 35 and / or upwardly curved guide vanes 36 are provided. These guide vanes 35, 36 can be made so that they are from the tongue-like Sheet metal parts consist of those for training the flow passages 34 provided Zones of the ring part 13b are bent out (FIG 6).

Die Demontage dieses Förderaggregates 21 zu Reinigungszwecken geschieht auf folgende Weise. Zunächst wird das untere Gehäuseteil 27 mit den Einlässen 27a vom Aggregatgehäuse 25 abgenommen. Dann wird durch Drehung von Hand das Pumpengehäuse 32 zusammen mit dem äußeren Ringteil 13b abgenommen. Sodann wird der Lagerschild 8 an nicht dargestellten Handhaben erfaßt und gegenüber dem Aggregatgehäuse 25 verdreht, so daß das vorerwähnte Laufzeug als Einheit aus dem elektrischen Motor 22 herausgezogen werden kann. Nach Reinigung aller Baugruppen erfolgt dann die Wiedermontage in umgekehrter Reihenfolge.The disassembly of this conveyor unit 21 too Cleaning purposes are done in the following way. First, the lower housing part 27 with the Inlets 27a removed from the unit housing 25. Then turn it by hand Pump housing 32 together with the outer Ring part 13b removed. Then the end shield 8 detected on handles, not shown and rotated relative to the unit housing 25, so that the aforementioned running gear as a unit the electric motor 22 are pulled out can. After cleaning all components then reassembly in reverse order.

Die in Figur 7 gezeigte, dritte Ausführungsform besteht aus einem allgemein mit 37 bezeichneten Förderaggregat 37. das ein Lüfter oder ein Gebläse ist. In diesem Fall ist wieder ein einteiliger Ringkörper 38 vorgesehen, der mit dem Gehäuse 39 des Lüfters 40 fest verbunden ist. z.B. durch Schweißpunkte. Durch eine äußere, allgemein mit 41 bezeichnete Bajonettausbildung ist das Gehäuse 42 des elektrischen Motors 43 am Gehäuse 39 des Lüfters 40 befestigt. Über eine innere, allgemein mit 44 bezeichnete Bajonettausbildung des Ringkörpers 38 ist der Lagerschild 45 mit dem Ringkörper 38 und dem Lüftergehäuse 39 verbunden. Der Lagerschild 45 trägt andererseits das vordere Lager 46 für die Motorwelle 47. Die Welle 47 wiederum trägt an ihrem dem Lüfter 40 zugekehrten Ende das Lüfterrad 48 und ist an ihrem hinteren Ende in üblicher Weise in einem weiteren Gleitlager 49 gelagert.The third embodiment shown in Figure 7 consists of a generally designated 37 Conveyor 37. that a fan or a blower is. In this case it is again a one-piece Ring body 38 provided with the housing 39 of the fan 40 is firmly connected. e.g. by Spot welds. By an outer, generally with The designated bayonet design is the housing 42 of the electric motor 43 on the housing 39 the fan 40 attached. About an inner, general with 44 bayonet training of the Ring body 38 is the end shield 45 with the Ring body 38 and the fan housing 39 connected. The end shield 45 carries the other hand front bearing 46 for the motor shaft 47. The shaft 47 in turn carries on the fan 40 facing End of the fan wheel 48 and is on hers rear end in the usual way in another Slide bearing 49 stored.

Auch in diesem Fall kann die Demontage und Wiedermontage auf einfache Weise von ungeschulten Benutzern schnell durchgeführt werden. Man wird so vorgehen, daß man zunächst das Lüftergehäuse 39 festhält und das Motorgehäuse 42 verdreht, so daß dieses dann zusammen mit dem Stator 50 und dem hinteren Lager 49 abgezogen wird. Dann wird man den Lagerschild 45 verdrehen, so daß dann das gesamte Laufzeug nach rechts herausgezogen werden kann. Nach der Wartung erfolgt die Wiedermontage in umgekehrter Reihenfolge.In this case too, disassembly and Easy reassembly by untrained Users can be done quickly. Man will proceed so that you first the fan housing 39 holds and rotates the motor housing 42, so that this together with the Stator 50 and the rear bearing 49 deducted becomes. Then you will turn the end shield 45, so that the whole of the trolley goes to the right can be pulled out. After maintenance reassembly takes place in reverse order.

Figur 8 zeigt eine abgeänderte Ausführungsform zu dem Beispiel in Figur 4. Hier besteht der Ringkörper 13 aus einem einteiligen flächigen Blechformteil mit einer ersten Bajonettausbildung 51 an seinem Innenumfang und einer zweiten Bajonettausbildung 52 an seinem Außenumfang. Zwischen beiden Bajonettausbildungen ist eine breite-Ringzone vorgesehen, die einen inneren Umfangsbereich 53 für die Befestigung des Ringkörpers 13 an dem Motorgehäuse 23 und einen äußeren Umfangsbereich 54 zur Ausbildung eines Leitapparates für die Beschickung des Strömungsringraumes 26 der Tauchpumpe umfaßt. Der Leitapparat ist vorzugsweise so ausgebildet, wie es in Verbindung mit den Figuren 4.5 und 6 beschrieben ist. Die äußere, vorspringend geformte Bajonettausbildung 52 des Ringkörpers 13 greift in eine dementsprechend übliche Nutausbildung des Pumpengehäuses 32.Figure 8 shows a modified embodiment to the example in Figure 4. Here is the Ring body 13 from a one-piece flat Sheet metal part with a first bayonet formation 51 on its inner circumference and a second bayonet formation 52 on its outer circumference. Between Both bayonet designs is a wide-ring zone provided an inner peripheral area 53 for fastening the ring body 13 on the motor housing 23 and an outer peripheral region 54 for the formation of a guide apparatus for loading the flow annulus 26 of the submersible pump. The guide is preferably formed as it is in connection is described with Figures 4.5 and 6. The outer, protruding shaped bayonet formation 52 of the ring body 13 engages accordingly usual groove design of the pump housing 32.

Claims (8)

  1. A conveying unit consisting of a flow machine with one or more runner wheels, and of an electric drive motor, in which the shaft of the drive motor is fixed axially and radially in a bearing plate on the side facing the flow machine and carries the runner wheel of the flow machine, characterised in that the bearing plate (8) and the housing (4, 32) of the flow machine (2, 24) each have a bayonet construction (18, 19), that an annular body (13), in one or several parts, is provided which is firmly connected with the housing (12, 23) of the drive motor (3, 22) and that on an inner bayonet construction (16, 28, 51) of the annular body (13), the bearing plate (8) is connected in a form-fitting manner and on an outer bayonet construction (17, 29, 52) of the annular body (13) the housing (4, 32) of the flow machine (pump) (2, 24) is connected in a form-fitting manner.
  2. A conveying unit consisting of a flow machine with one or more runner wheels and of an electric drive motor, in which the shaft of the drive motor is fixed axially and radially in a bearing plate on the side facing the flow machine and carries the runner wheel of the flow machine, characterised in that the bearing plate (45) and the housing (42) of the electric drive motor (43) each have a bayonet construction, that an annular body (38), in one or several parts, is provided, which is firmly connected with the housing (39) of the flow machine (fan) (40) and that on an inner bayonet construction (44) of the annular body (38) the bearing plate (45) is connected in a form-fitting manner and on an outer bayonet construction (41) of the annular body (38) the housing (42) of the electric drive motor (43) is connected in a form-fitting manner.
  3. A conveying unit according to Claim 1 or 2, characterised in that the annular body (13, 38) consists of a flat sheet metal shaped part with a first bayonet construction (16, 28, 51, 44) on its inner circumference, a second bayonet construction (17, 29, 52, 41) on its outer circumference and of a securing ring zone (14, 53), provided between the two bayonet constructions, for it to be mounted.
  4. A conveying unit according to Claim 1 or 2, characterised in that the bayonet constructions of the annular body (13; 38) and of the components connected therewith are each provided with detent means (20).
  5. A conveying unit according to Claim 1, in which the housing (23) of the electric drive motor (22) is surrounded at a distance by a unit housing (25) to form a flow annulus (26) fed by the flow machine (24) (immersion pump), characterised in that the annular body (13) consists of an inner and of an outer ring part (13a, 13b), which are both connected with each other by means of bayonet construction (28, 31), and the outer ring part (13b) is constructed as a distributor (34, 35, 36) of the annular body (13), which is firmly connected at its outer circumference with the housing (32) of the flow machine (24), and that the distributor is provided with flow passages (34) and guide vanes (35, 36) for the conveying medium.
  6. A conveying unit according to Claim 5, characterised in that the outer annular part (13b) in the form of the distributor (34, 35, 36) consists of a sheet metal shaped part and that the guide vanes (35, 36) consist of those tongue-like sheet metal parts which are bent out from the zones of the annular part (13b) provided to form the flow passages (34).
  7. A conveying unit according to Claim 1, in which the housing of the electric drive motor is surrounded at a distance by a unit housing to form a flow annulus fed by the flow machine (immersion pump), characterised in that the annular body (13) consists of a sheet metal shaped part with a first bayonet construction (51) on its inner circumference, a second bayonet construction (52) on its outer circumference and of a flat ring zone (53, 54) provided between the two bayonet constructions, that the ring zone has an inner circumferential region (53) for the attachment of the annular body (13) and an outer circumferential region (54) constructed as a distributor for the feeding of the flow annulus (6) and that the distributor is provided with flow passages (34) and guide vanes (35, 36).
  8. A conveying unit according to Claim 7, characterised in that the guide vanes (35, 36) consist of those tongue-like sheet metal parts which are bent out from the zones of the outer circumferential region of the annular body (13) which are provided for the formation of the flow passages (34).
EP92110180A 1991-07-06 1992-06-17 Pumping assembly made of a flow machine and drive motor Expired - Lifetime EP0522324B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4122487A DE4122487C2 (en) 1991-07-06 1991-07-06 Conveyor unit from a fluid flow machine and a drive motor
DE4122487 1991-07-06

Publications (3)

Publication Number Publication Date
EP0522324A1 EP0522324A1 (en) 1993-01-13
EP0522324B1 EP0522324B1 (en) 1995-06-21
EP0522324B2 true EP0522324B2 (en) 1998-09-02

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EP92110180A Expired - Lifetime EP0522324B2 (en) 1991-07-06 1992-06-17 Pumping assembly made of a flow machine and drive motor

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EP (1) EP0522324B2 (en)
DE (2) DE4122487C2 (en)

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DE4304945A1 (en) * 1993-02-19 1994-08-25 Ulli Weinberg Electrically driven liquid pump
DE19509134A1 (en) * 1995-03-14 1996-09-19 Wilo Gmbh Stator mounting for a canned motor
DE10101521A1 (en) * 2001-01-12 2002-07-18 Bosch Gmbh Robert Gear drive unit
GB0326534D0 (en) * 2003-11-14 2003-12-17 Weir Warman Ltd Pump insert and assembly
DE102005059636A1 (en) * 2005-12-14 2007-06-21 Pfeiffer Vacuum Gmbh vacuum pump
GB2430468B (en) * 2006-06-01 2007-08-29 Vent Axia Ltd Improvements in or relating to a heat recovery unit
FR2995067B1 (en) * 2012-08-31 2014-08-29 Atlantic Climatisation Et Ventilation VENTILATION UNIT WITH A BAIONNETTE TYPE DEVICE
ES2897758T3 (en) * 2017-03-31 2022-03-02 Grundfos Holding As pump assembly
EP3382206B1 (en) 2017-03-31 2020-12-16 Grundfos Holding A/S Pump assembly

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DE1895968U (en) * 1964-04-15 1964-07-02 Hans Dr Ing Moser CIRCULATING PUMP.
FR1399239A (en) * 1964-06-19 1965-05-14 Rotron Manufactureing Company Fan
US3407739A (en) * 1966-02-15 1968-10-29 Champion Cooler Corp Pumps and pump housing and motor unit
CH495555A (en) * 1968-08-16 1970-08-31 Micromedic Systems Inc Distributor pump
DE2751516A1 (en) * 1977-11-18 1979-05-23 Hanning Elektro Werke Circulating pump for heating installations - has pump and motor constructed as one unit which is easily dismantled for maintenance
DE3220448C1 (en) * 1982-05-29 1983-08-11 Grundfos A/S, 8850 Bjerringbro Pump unit for heating and domestic water systems
DE8514221U1 (en) * 1985-05-14 1985-08-01 Kupplungstechnik Gmbh, 4440 Rheine Device for fastening a pump unit
DE3524515A1 (en) * 1985-07-09 1987-01-15 Thyssen Plastik Anger Kg WATER PUMP OR THE LIKE
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EP0260501B1 (en) * 1986-09-12 1990-03-14 Siemens Aktiengesellschaft Pump driven by an electromotor
JPH03175195A (en) * 1989-09-26 1991-07-30 Ebara Corp Submerged pump

Also Published As

Publication number Publication date
DE4122487C1 (en) 1992-11-26
EP0522324B1 (en) 1995-06-21
EP0522324A1 (en) 1993-01-13
DE59202598D1 (en) 1995-07-27
DE4122487C2 (en) 1997-09-18

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