EP0664398A1 - Centrifugal pump with backflow prevention valve - Google Patents

Centrifugal pump with backflow prevention valve Download PDF

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Publication number
EP0664398A1
EP0664398A1 EP95100590A EP95100590A EP0664398A1 EP 0664398 A1 EP0664398 A1 EP 0664398A1 EP 95100590 A EP95100590 A EP 95100590A EP 95100590 A EP95100590 A EP 95100590A EP 0664398 A1 EP0664398 A1 EP 0664398A1
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EP
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Prior art keywords
centrifugal pump
pump according
pump
stage
membrane
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EP95100590A
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German (de)
French (fr)
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EP0664398B1 (en
Inventor
Manfred Neuhaus-Melsheimer
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Wilo GmbH
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Wilo GmbH
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
    • F04D15/0077—Safety measures
    • F04D15/0083—Protection against sudden pressure change, e.g. check valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D1/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F04D1/06—Multi-stage pumps
    • F04D1/063—Multi-stage pumps of the vertically split casing type
    • F04D1/066—Multi-stage pumps of the vertically split casing type the casing consisting of a plurality of annuli bolted together

Definitions

  • the invention relates to a centrifugal pump, in particular a multi-stage inline pump with bearings that support the impeller shaft and with a valve that prevents the backflow, the conveying medium emerging from the last stage being pressed into an annular space surrounding the stage (s), from which it flows to the outlet.
  • the object of the invention is to improve a pump of the type mentioned in such a way that, with a simple construction, small construction and simple assembly, only low flow speeds occur within the valve, so that low losses and noises occur.
  • the return valve can be arranged in the flow direction behind the pump, in particular behind the last pump stage and close to the bearing and / or the shaft seal, which faces away from the pump suction and pressure connection.
  • the reflux valve be arranged in the flow direction behind the pump, in particular behind the last pump stage and near or in the annulus outlet, in particular near the first pump stage.
  • Such a diaphragm valve does not require an additional housing and, despite the small external dimensions of the overall pump, can be of relatively oversized design, as a result of which low flow velocities and thus a low resistance arise, so that flow losses and noises remain very low.
  • the reflux valve surrounds a chamber with a ring membrane into which the pump in particular conveys the last pump stage. It is also advantageously proposed that the support surface for the ring membrane is formed by a support part with flow openings lying inside the ring membrane and conically shaped on the outside.
  • a particularly simple and safe construction is provided when the support part forming the support surfaces is attached to the component carrying the shaft seal. A reduction in the number of components is achieved if the support part forming the support surfaces is integral with the component carrying the shaft seal.
  • the support part forming the support surfaces is a deep-drawn sheet metal part or a cast part.
  • the annular membrane simultaneously forms the pump housing seal between the cylinder (housing jacket) surrounding the annular space and the housing part carrying the shaft sealing end.
  • the ring membrane thus has a double function.
  • the conical ring membrane be fastened on the side facing away from the suction and pressure nozzle and movable with the other side, so that the ring membrane can open towards the annular space.
  • a manually operated shut-off valve in particular a flap valve, is arranged in the suction and pressure ports. This means that the pump hydraulics with the integrated backflow preventer can be completely closed for inspection, so that assembly or disassembly and repair are made considerably easier.
  • the flaps are tight when the locking piece, in particular the flap, is surrounded by a sealing sleeve made of flexible material, which at least partially lines the connector.
  • the sealing sleeve be led outwards over the sealing surface of the connecting flange, so that the sealing material serves both to seal the flap and the connection.
  • the exemplary embodiment according to FIGS. 1 and 2 has a package of pump stages 1 which are connected in series and whose impellers 2 are seated on an impeller shaft 3 which is supported by a bearing 4.
  • the bearing 4 close to the suction nozzle 6 and pressure nozzle 7 is located approximately in the area of the first pump stage, and the shaft seal 5 removed from the suction and pressure nozzle is fastened in the area of the rear housing part 8, which is also called "pump lantern".
  • the last pump stage delivers into an annular chamber 9, which is surrounded by a support part 10 in an annular manner and through which the impeller shaft 3 runs coaxially.
  • the support part 10 is conically shaped, and closer to the supports 6, 7 it has a smaller diameter than in the area further away.
  • the support member 10 has numerous flow openings 11, and on its outside there is a correspondingly conically shaped flexible membrane 12 when the pump is not delivering. This membrane is lifted outwards from the support part 10 when the pump is pumping, so that the pumped medium can enter an annular space 13 which coaxially surrounds all pump stages on the outside.
  • the outer surface of the annular space 13 is formed by a cylindrical housing jacket 14, which can consist of a thin-walled tube.
  • the pumped liquid flows from the annular space 13 to the pressure port 7, which, like the suction port 6, is formed by a connection housing 15.
  • Suction nozzle 6 and pressure nozzle 7 are aligned with each other in the connection housing, so that the multi-stage centrifugal pump is an inline pump.
  • the annular membrane 12 With its outer annular end, the annular membrane 12 simultaneously forms the pump housing seal between the cylindrical housing jacket 14 surrounding the annular space 13 and the rear housing part 8.
  • the component or support part 10 forming the support surface is embodied in one piece with the housing part 8 in the exemplary embodiment according to FIGS. 1 and 2 and can be cast together with this from metal.
  • the support part 10 consists of a deep-drawn sheet metal part which is mounted between the last pump stage and the housing part 8.
  • a rotatable flap 16, 17 is mounted in the suction port 6 and in the pressure port 7, a rotatable flap 16, 17 is mounted.
  • the rotary flap can be actuated via a shaft 18, 19 by a hand lever 20 or 21.
  • the inside of the respective nozzle 6, 7 is lined in the area of the flap 16, 17 by a sealing sleeve 22, 23 which is correspondingly cylindrical.
  • the outer end of the two sleeves 22, 23 extends so far outward over the sealing surface of the flange of each connecting piece that the sleeve forms an annular sealing surface 24, 25 there.
  • the last pump stage in particular forms the support surface for the ring membrane, so that the support part 10 is formed by this pump stage.
  • the annular membrane is arranged at the end of the annular space which is close to the suction and pressure nozzle 6, 7.
  • an intermediate part (flange part) 28 to which the housing part 8 and the housing part 27 are screwed on opposite sides.
  • the flange part 28 forms with its support part 10 on the inside a coaxial conical support surface for the ring membrane 12, the ring membrane resting against the support part 10 in the closed state.

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

Abstract

The pump has the delivery medium emerging from the last stage is pressed into a ring space (13) surrounding the stages, from which it flows to the outlet. The back flow valve (10-12) is arranged abutting the ring space. It is arranged in the flow direction behind the pump, partic. behind the last pump stage, and near the bearing and/or the shaft seal (5) which is turned away from the pump suction and pressure connections (6, 7). The back flow valve surrounds a chamber (9) with a ring membrane (12), into which the pump and partic. the last pump stage delivers. The support surface for the ring membrane is formed by an externally conically formed support part (10) with through flow apertures (11) located inside the ring membrane.

Description

Die Erfindung betrifft eine Kreiselpumpe insbesondere mehrstufige Inlinepumpe mit die Laufradwelle tragenden Lagern und mit einem den Rückfluß verhindernden Ventil, wobei das aus der letztzen Stufe austretende Fördermedium in einen die Stufe(n) umgebenden Ringraum gedrückt wird, von dem es zum Auslauf strömt.The invention relates to a centrifugal pump, in particular a multi-stage inline pump with bearings that support the impeller shaft and with a valve that prevents the backflow, the conveying medium emerging from the last stage being pressed into an annular space surrounding the stage (s), from which it flows to the outlet.

Es ist bekannt, bei einer mehrstufigen Kreiselpumpe ein den Rückfluß verhinderndes Ventil in demjenigen Pumpengehäuseteil anzuordnen, das den Saug- und Druckstutzen bildet, siehe US-Patent 5 201 633. Der Einbau eines solchen Ventils ist verhältnismäßig aufwendig und platzraubend.It is known in a multi-stage centrifugal pump to arrange a backflow preventing valve in the pump housing part which forms the suction and pressure port, see US Pat. No. 5,201,633. The installation of such a valve is relatively complex and takes up a lot of space.

Aufgabe der Erfindung ist es, eine Pumpe der eingangs genannten Art so zu verbessern, daß bei einfacher Konstruktion, kleiner Bauweise und einfacher Montage innerhalb des Ventils nur geringe Strömungsgeschwindigkeiten auftreten, so daß geringe Verluste und Geräusche entstehen.The object of the invention is to improve a pump of the type mentioned in such a way that, with a simple construction, small construction and simple assembly, only low flow speeds occur within the valve, so that low losses and noises occur.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß das Rückflußventil im Ringraum insbesondere angrenzend an dem Ringraum angeordnet ist.This object is achieved in that the reflux valve is arranged in the annulus, in particular adjacent to the annulus.

Hierbei kann das Rücklaufventil in Strömungsrichtung hinter der Pumpe insbesondere hinter der letzten Pumpenstufe und nahe des Lagers und/oder der Wellendichtung angeordnet sein, das/die den Pumpensaug- und -druckstutzen abgewandt ist.Here, the return valve can be arranged in the flow direction behind the pump, in particular behind the last pump stage and close to the bearing and / or the shaft seal, which faces away from the pump suction and pressure connection.

Alternativ wird vorgeschlagen, daß das Rückflußventil in Strömungsrichtung hinter der Pumpe, insbesondere hinter der letzten Pumpenstufe und nahe oder in dem Ringraumauslaß, insbesondere nahe der ersten Pumpenstufe angeordnet ist.Alternatively, it is proposed that the reflux valve be arranged in the flow direction behind the pump, in particular behind the last pump stage and near or in the annulus outlet, in particular near the first pump stage.

Ein solches Menbranventil braucht kein zusätzliches Gehäuse und kann trotz kleiner Außenabmessungen der Gesamtpumpe relativ überdimensioniert ausgeführt sein, wodurch geringe Fließgeschwindigkeiten und damit ein geringer Widerstand entsteht, so daß Strömungsverluste und Geräusche sehr niedrig bleiben.Such a diaphragm valve does not require an additional housing and, despite the small external dimensions of the overall pump, can be of relatively oversized design, as a result of which low flow velocities and thus a low resistance arise, so that flow losses and noises remain very low.

Besonders vorteilhaft ist es hierbei, wenn das Rückflußventil mit einer Ringmembran eine Kammer umgibt, in die die Pumpe insbesondere die letzte Pumpenstufe fördert. Auch wird vorteilhafterweise vorgeschlagen, daß die Stützfläche für die Ringmembran von einem innerhalb der Ringmembran liegenden, außen konisch geformten Stützteil mit Durchströmungsöffnungen gebildet ist.It is particularly advantageous here if the reflux valve surrounds a chamber with a ring membrane into which the pump in particular conveys the last pump stage. It is also advantageously proposed that the support surface for the ring membrane is formed by a support part with flow openings lying inside the ring membrane and conically shaped on the outside.

Eine besonders einfache und sichere Konstruktion ist dann gegeben, wenn das die Stützflächen bildende Stützteil an dem die Wellendichtung tragenden Bauteil befestigt ist. Eine Verringerung der Bauteile wird erreicht, wenn das die Stützflächen bildende Stützteil mit dem die Wellendichtung tragende Bauteil einstückig ist.A particularly simple and safe construction is provided when the support part forming the support surfaces is attached to the component carrying the shaft seal. A reduction in the number of components is achieved if the support part forming the support surfaces is integral with the component carrying the shaft seal.

Besonders kleine Außenabmessungen werden geschaffen, wenn die Ringmembran die letzte Pumpenstufe umgibt.
Auch ist es von Vorteil, wenn das die Stützflächen bildende Stützteil ein Blechtiefziehteil oder ein Gußteil ist.Particularly small external dimensions are created when the ring membrane surrounds the last pump stage.
It is also advantageous if the support part forming the support surfaces is a deep-drawn sheet metal part or a cast part.

Die Konstruktion wird noch einfacher und mit geringeren Abmessungen, wenn die letzte Pumpenstufe die Stützfläche für die Ringmembran bildet. Auch ist es von Vorteil, wenn die Ringmenbran koaxial zur Pumpenwelle angeordnet ist.The construction becomes even simpler and with smaller dimensions if the last pump stage forms the support surface for the ring membrane. It is also advantageous if the annular membrane is arranged coaxially with the pump shaft.

Vorzugsweise wird vorgeschlagen, daß die Ringmembran gleichzeitig die Pumpengehäusedichtung zwischen dem den Ringraum umgebenden Zylinder (Gehäusemantel) und dem das Wellendichtende tragende Gehäuseteil bildet. Damit kommt der Ringmembran eine doppelte Funktion zu.It is preferably proposed that the annular membrane simultaneously forms the pump housing seal between the cylinder (housing jacket) surrounding the annular space and the housing part carrying the shaft sealing end. The ring membrane thus has a double function.

Vorzugsweise wird vorgeschlagen, daß die konische Ringmembran auf der den Saug- und Druckstutzen abgewandten Seite befestigt und mit der anderen Seite beweglich ist, so daß die Ringmembran sich zum Ringraum hin öffnen kann.It is preferably proposed that the conical ring membrane be fastened on the side facing away from the suction and pressure nozzle and movable with the other side, so that the ring membrane can open towards the annular space.

Vorzugsweise wird vorgeschlagen, daß im Saug- und Druckstutzen je ein von Hand betätigbares Absperrventil, insbesondere je ein Klappenventil angeordnet ist. Damit kann die Pumpenhydraulik mit dem integrierten Rückflußverhinderer komplett zur Revision abgeschlossen werden, so daß Montage oder Demontage und Reparatur erheblich erleichtert sind.It is preferably proposed that a manually operated shut-off valve, in particular a flap valve, is arranged in the suction and pressure ports. This means that the pump hydraulics with the integrated backflow preventer can be completely closed for inspection, so that assembly or disassembly and repair are made considerably easier.

Bei einfachster Konstruktion wird eine hohe Dichtigkeit der Klappen dann erreicht, wenn das Sperrstück insbesondere die Klappe von einer Dichtmanschette aus flexiblem Material umgeben ist, die den Stutzen zumindest zum Teil auskleidet. Hierbei kann die Dichtmanschette nach außen bis über die Dichtfläche des Anschlußflansches geführt sein, so daß das Dichtmaterial sowohl der Abdichtung der Klappe als auch des Anschlusses dient.In the simplest design, the flaps are tight when the locking piece, in particular the flap, is surrounded by a sealing sleeve made of flexible material, which at least partially lines the connector. Here, the sealing sleeve be led outwards over the sealing surface of the connecting flange, so that the sealing material serves both to seal the flap and the connection.

Zwei Ausführungsbeispiele der Erfindung sind in den Zeichnungen in axialen Schnitten dargestellt und werden im folgenden näher beschrieben.Two exemplary embodiments of the invention are shown in the drawings in axial sections and are described in more detail below.

Es zeigen:

Fig. 1
ein erstes Ausführungsbeispiel in montiertem Zustand,
Fig. 2
das erste Ausführungsbeispiel in demontiertem Zustand,
Fig. 3
ein zweites Ausführungsbeispiel in montiertem Zustand,
Fig. 4
das zweite Ausführungsbeispiel in demontiertem Zustand und
Fig. 5
ein drittes Ausführungsbeispiel im unteren Bereich.
Show it:
Fig. 1
a first embodiment in the assembled state,
Fig. 2
the first embodiment in a disassembled state,
Fig. 3
a second embodiment in the assembled state,
Fig. 4
the second embodiment in a disassembled state and
Fig. 5
a third embodiment in the lower area.

Das Ausführungsbeispiel nach den Figuren 1 und 2 weist ein Paket von Pumpenstufen 1 auf, die hintereinander geschaltet sind und deren Laufräder 2 auf einer Laufradwelle 3 sitzen, die von einem Lager 4 getragen ist. Das dem Saugstutzen 6 und Druckstutzen 7 nahe Lager 4 befindet sich etwa im Bereich der ersten Pumpenstufe, und die vom Saug- und Druckstutzen entfernte Wellendichtung 5 ist im Bereich des hinteren Gehäuseteils 8 befestigt, das auch "Pumpenlaterne" genannt wird.The exemplary embodiment according to FIGS. 1 and 2 has a package of pump stages 1 which are connected in series and whose impellers 2 are seated on an impeller shaft 3 which is supported by a bearing 4. The bearing 4 close to the suction nozzle 6 and pressure nozzle 7 is located approximately in the area of the first pump stage, and the shaft seal 5 removed from the suction and pressure nozzle is fastened in the area of the rear housing part 8, which is also called "pump lantern".

Die letzte Pumpenstufe fördert in eine ringförmige Kammer 9, die von einem Stützteil 10 ringförmig umgeben ist und durch die die Laufradwelle 3 koaxial verläuft. Das Stützteil 10 ist konisch geformt, wobei es näher zu den Stützen 6,7 einen geringeren Durchmesser aufweist als im weiter entfernten Bereich. Das Stützteil 10 besitzt zahlreiche Durchflußöffnungen 11, und an seiner Außenseite liegt bei nicht fördernder Pumpe eine entsprechend konisch geformte flexible Membran 12 an. Diese Membran wird bei fördernder Pumpe von dem Stützteil 10 nach außen hin abgehoben, so daß das Fördermedium in einen Ringraum 13 treten kann, der alle Pumpenstufen außen koaxial umgibt. Die Außenfläche des Ringraums 13 wird durch einen zylindrischen Gehäusemantel 14 gebildet, der aus einem dünnwandigen Rohr bestehen kann.The last pump stage delivers into an annular chamber 9, which is surrounded by a support part 10 in an annular manner and through which the impeller shaft 3 runs coaxially. The support part 10 is conically shaped, and closer to the supports 6, 7 it has a smaller diameter than in the area further away. The support member 10 has numerous flow openings 11, and on its outside there is a correspondingly conically shaped flexible membrane 12 when the pump is not delivering. This membrane is lifted outwards from the support part 10 when the pump is pumping, so that the pumped medium can enter an annular space 13 which coaxially surrounds all pump stages on the outside. The outer surface of the annular space 13 is formed by a cylindrical housing jacket 14, which can consist of a thin-walled tube.

Vom Ringraum 13 fließt die Förderflüssigkeit zum Druckstutzen 7, der wie auch der Saugstutzen 6 von einem Anschlußgehäuse 15 gebildet wird. Saugstutzen 6 und Druckstutzen 7 liegen im Anschlußgehäuse zueinander fluchtend, so daß die mehrstufige Kreiselpumpe eine Inline-Pumpe ist.The pumped liquid flows from the annular space 13 to the pressure port 7, which, like the suction port 6, is formed by a connection housing 15. Suction nozzle 6 and pressure nozzle 7 are aligned with each other in the connection housing, so that the multi-stage centrifugal pump is an inline pump.

Die Ringmembran 12 bildet mit ihrem äußeren ringförmigen Ende gleichzeitig die Pumpengehäusedichtung zwischen dem den Ringraum 13 umgebenden zylindrischen Gehäusemantel 14 und dem hinteren Gehäuseteil 8. Das die Stützfläche bildende Bauteil bzw. Stützteil 10 ist im Ausführungsbeispiel nach Figur 1 und 2 einstückig mit dem Gehäuseteil 8 ausgeführt und kann mit diesem zusammen aus Metall gegossen sein. Im Ausführungsbeispiel nach den Figuren 3 und 4 besteht das Stützteil 10 aus einem Blechtiefziehteil, das zwischen der letzten Pumpenstufe und dem Gehäuseteil 8 montiert wird.With its outer annular end, the annular membrane 12 simultaneously forms the pump housing seal between the cylindrical housing jacket 14 surrounding the annular space 13 and the rear housing part 8. The component or support part 10 forming the support surface is embodied in one piece with the housing part 8 in the exemplary embodiment according to FIGS. 1 and 2 and can be cast together with this from metal. In the exemplary embodiment according to FIGS. 3 and 4, the support part 10 consists of a deep-drawn sheet metal part which is mounted between the last pump stage and the housing part 8.

Im Saugstutzen 6 als auch im Druckstutzen 7 ist jeweils eine drehverstellbare Klappe 16,17 gelagert. Über jeweils eine Welle 18,19 ist die Drehklappe durch einen Handhebel 20 bzw. 21 betätigbar. Das Innere des jeweiligen Stutzens 6,7 ist im Bereich der Klappe 16,17 von einer Dichtmanschette 22,23 ausgekleidet, die entsprechend zylindrisch ausgeformt ist. Das äußere Ende der beiden Manschetten 22,23 ist so weit nach außen über die Dichtfläche des Flansches jeden Stutzens geführt, daß die Manschette dort jeweils eine ringförmige Dichtfläche 24,25 bildet.In the suction port 6 and in the pressure port 7, a rotatable flap 16, 17 is mounted. The rotary flap can be actuated via a shaft 18, 19 by a hand lever 20 or 21. The inside of the respective nozzle 6, 7 is lined in the area of the flap 16, 17 by a sealing sleeve 22, 23 which is correspondingly cylindrical. The outer end of the two sleeves 22, 23 extends so far outward over the sealing surface of the flange of each connecting piece that the sleeve forms an annular sealing surface 24, 25 there.

In einer nicht dargestellten, alternativen Ausführungsform bildet insbesondere die letzte Pumpenstufe die Stützfläche für die Ringmembran, so daß das Stützteil 10 von dieser Pumpenstufe gebildet wird.In an alternative embodiment, not shown, the last pump stage in particular forms the support surface for the ring membrane, so that the support part 10 is formed by this pump stage.

Beim Ausführungsbeispiel nach Figur 5 ist die Ringmembran an dem Ende des Ringraums angeordnet, das dem Saug- und Druckstutzen 6,7 nahe ist. Zwischen dem Gehäusemantel 14 und dem Gehäuseteil 27, das den Saug- und Druckstutzen 6,7 bildet, liegt ein Zwischenteil (Flanschteil) 28, an dem das Gehäuseteil 8 und das Gehäuseteil 27 auf gegenüberliegenden Seiten angeschraubt sind. Das Flanschteil 28 bildet innen mit seinem Stützteil 10 eine koaxiale konische Stützfläche für die Ringmembran 12, wobei die Ringmembran im geschlossenen Zustand an dem Stützteil 10 anliegt.In the exemplary embodiment according to FIG. 5, the annular membrane is arranged at the end of the annular space which is close to the suction and pressure nozzle 6, 7. Between the housing jacket 14 and the housing part 27, which forms the suction and discharge nozzle 6, 7, there is an intermediate part (flange part) 28, to which the housing part 8 and the housing part 27 are screwed on opposite sides. The flange part 28 forms with its support part 10 on the inside a coaxial conical support surface for the ring membrane 12, the ring membrane resting against the support part 10 in the closed state.

Claims (18)

Kreiselpumpe, insbesondere mehrstufige Inlinepumpe mit die Laufradwelle tragenden Lagern (4), bzw. Dichtungen (5) und mit einem den Rückfluß verhindernden Ventil (10-12), wobei das aus der letzten Stufe austretende Fördermedium in einen die Stufe(n) umgebenden Ringraum (13) gedrückt wird, von dem es zum Auslaß hin strömt, dadurch gekennzeichnet, daß das Rückflußventil (10-12) im Ringraum insbesondere angrenzend an den Ringraum angeordnet ist.Centrifugal pump, in particular a multi-stage inline pump with bearings (4) supporting the impeller shaft, or seals (5) and with a valve (10-12) preventing backflow, the conveying medium emerging from the last stage entering an annular space surrounding the stage (s) (13) is pressed, from which it flows towards the outlet, characterized in that the reflux valve (10-12) is arranged in the annular space, in particular adjacent to the annular space. Kreiselpumpe nach Anspruch 1, dadurch gekennzeichnet, daß das Rückflußventil (10-12) in Strömungsrichtung hinter der Pumpe insbesondere hinter der letzten Pumpenstufe und nahe des Lagers und/oder der Wellendichtung (5) angeordnet ist, das/die den Pumpensaug- und -druckstutzen (6,7) abgewandt ist.Centrifugal pump according to claim 1, characterized in that the reflux valve (10-12) is arranged in the flow direction behind the pump, in particular behind the last pump stage and close to the bearing and / or the shaft seal (5) which the pump suction and pressure nozzle (6.7) is turned away. Kreiselpumpe nach Anspruch 1, dadurch gekennzeichnet, daß das Rückflußventil (10-12) in Strömungsrichtung hinter der Pumpe, insbesondere hinter der letzten Pumpenstufe und nahe oder in dem Ringraumauslaß, insbesondere nahe der ersten Pumpenstufe angeordnet ist.Centrifugal pump according to claim 1, characterized in that the reflux valve (10-12) is arranged in the flow direction behind the pump, in particular behind the last pump stage and near or in the annular space outlet, in particular near the first pump stage. Kreiselpumpe nach einem der vorigen Ansprüche, dadurch gekennzeichnet, daß das Rückflußventil (10-12) mit einer Ringmembran (12) eine Kammer (9) umgibt, in die die Pumpe, insbesondere die letzte Pumpenstufe fördert.Centrifugal pump according to one of the preceding claims, characterized in that the reflux valve (10-12) with a ring membrane (12) surrounds a chamber (9) into which the pump, in particular the last pump stage, conveys. Kreiselpumpe nach einem der vorigen Ansprüche, dadurch gekennzeichnet, daß die Stützfläche für die Ringmembran (12) von einem innerhalb der Ringmembran liegenden, außen konisch geformten Stützteil (10) mit Durchströmungsöffnungen (11) gebildet ist.Centrifugal pump according to one of the preceding claims, characterized in that the support surface for the ring membrane (12) is formed by a support part (10) with flow openings (11) lying inside the ring membrane and conically shaped on the outside. Kreiselpumpe nach Anspruch 5, dadurch gekennzeichnet, daß das die Stützflächen bildende Stützteil (10) an dem die Wellendichtung tragenden Bauteil (8) befestigt ist.Centrifugal pump according to claim 5, characterized in that the supporting part (10) forming the supporting surfaces is attached to the component (8) carrying the shaft seal. Kreiselpumpe nach Anspruch 5, dadurch gekennzeichnet, daß das die Stützflächen bildende Stützteil (10) mit dem die Wellendichtung tragenden Bauteil (8) einstückig ist.Centrifugal pump according to claim 5, characterized in that the support part (10) forming the support surfaces is integral with the component (8) carrying the shaft seal. Kreiselpumpe nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, daß die Ringmembran (12) (12) die letzte Pumpenstufe umgibt.Centrifugal pump according to one of the preceding claims, characterized in that the annular membrane (12) (12) surrounds the last pump stage. Kreiselpumpe nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, daß das die Stützflächen bildende Stützteil (10) ein Blechtiefziehteil oder ein Gußteil ist.Centrifugal pump according to one of the preceding claims, characterized in that the supporting part (10) forming the supporting surfaces is a deep-drawn sheet metal part or a cast part. Kreiselpumpe nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, daß eine Pumpenstufe, insbesondere die letzte Pumpenstufe die Stützfläche für die Ringmembran (12) bildet.Centrifugal pump according to one of the preceding claims, characterized in that a pump stage, in particular the last pump stage, forms the support surface for the ring membrane (12). Kreiselpumpe nach einem der vorigen Ansprüche, dadurch gekennzeichnet, daß ein den Pumpenkammereinlaß umgebendes Teil (26) die Stützfläche für die Ringmembran (12) bildet.Centrifugal pump according to one of the preceding claims, characterized in that a part (26) surrounding the pump chamber inlet forms the support surface for the ring membrane (12). Kreiselpumpe nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, daß die Ringmembran (12) koaxial zur Pumpenwelle (3) angeordnet ist.Centrifugal pump according to one of the preceding claims, characterized in that the ring membrane (12) is arranged coaxially to the pump shaft (3). Kreiselpumpe nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, daß die Ringmembran (12) gleichzeitig die Pumpengehäusedichtung zwischen dem den Ringraum umgebenden Zylinder (Gehäusemantel (14)) und dem die Wellendichtung tragenden Gehäuseteil (8) bildet.Centrifugal pump according to one of the preceding claims, characterized in that the annular membrane (12) simultaneously forms the pump housing seal between the cylinder surrounding the annular space (housing jacket (14)) and the housing part (8) carrying the shaft seal. Kreiselpumpe nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, daß die konische Ringmembran (12) auf der den Saug- und Druckstutzen (6,7) abgewandten Seite befestigt und mit der anderen Seite beweglich ist.Centrifugal pump according to one of the preceding claims, characterized in that the conical ring membrane (12) is fastened on the side facing away from the suction and pressure ports (6, 7) and is movable with the other side. Kreiselpumpe nach einem der vorigen Ansprüche, dadurch gekennzeichnet, daß die Ringmembran (12) an einem Flanschteil befestigt ist, an dem auf einer Seite das Ein-/Auslaßgehäuse (27) und auf der anderen Seite der die Ringkammer umgebende Gehäusemantel (14) angrenzt.Centrifugal pump according to one of the preceding claims, characterized in that the annular membrane (12) is fastened to a flange part, on which the inlet / outlet housing (27) adjoins on one side and the housing jacket (14) surrounding the annular chamber on the other side. Kreiselpumpe nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, daß im Saug- und Druckstutzen (6,7) je ein von Hand betätigbares Klappenventil (16,17) angeordnet ist.Centrifugal pump according to one of the preceding claims, characterized in that a flap valve (16, 17) which can be actuated by hand is arranged in each of the suction and pressure ports (6, 7). Kreiselpumpe nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, daß das Sperrstück insbesondere die Klappe von einer Dichtmanschette (22,23) aus flexiblem Material umgeben ist, die den Stutzen (6,7) zumindest zum Teil auskleidet.Centrifugal pump according to one of the preceding claims, characterized in that the blocking piece, in particular the flap, is surrounded by a sealing sleeve (22, 23) made of flexible material, which at least partially lines the connector (6, 7). Kreiselpumpe nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, daß die Dichtmanschette (22,23) nach außen bis über die Dichtfläche (24,25) des Anschlußflansches geführt ist.Centrifugal pump according to one of the preceding claims, characterized in that the sealing sleeve (22, 23) is guided outwards beyond the sealing surface (24, 25) of the connecting flange.
EP95100590A 1994-01-21 1995-01-18 Centrifugal pump with backflow prevention valve Expired - Lifetime EP0664398B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4401658 1994-01-21
DE4401658A DE4401658A1 (en) 1994-01-21 1994-01-21 Centrifugal pump with backflow preventing valve

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EP0664398A1 true EP0664398A1 (en) 1995-07-26
EP0664398B1 EP0664398B1 (en) 1998-07-22

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DE (2) DE4401658A1 (en)
ES (1) ES2119237T3 (en)

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FR2776342A1 (en) * 1998-03-18 1999-09-24 Sarl Cg Promo Star Self-priming centrifugal pump
EP1431584A2 (en) * 2002-12-18 2004-06-23 Bogemar, S.L. Multi-stage electric pump
EP2112380A1 (en) 2008-04-21 2009-10-28 DP Industries B.V. Multi-stage centrifugal pump of the in line-type
EP2916008A1 (en) * 2014-03-07 2015-09-09 CALPEDA S.p.A. Improved electric pump particularly suitable for pumping liquids containing solid impurities
CN106321448A (en) * 2016-09-29 2017-01-11 周宁县善长祥农业机械研发有限公司 Multi-stage water pump and using method thereof
CN106545496A (en) * 2016-09-29 2017-03-29 周宁县善长祥农业机械研发有限公司 Sleeping suction multi-stage pipeline pump
WO2023151114A1 (en) * 2022-02-10 2023-08-17 浙江水泵总厂有限公司 Pump body structure and centrifugal pump having same
CN117967579A (en) * 2024-04-01 2024-05-03 烟台大学 High-pressure high-lift pump with external liquid collecting pipe

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DE19803162A1 (en) 1998-01-28 1999-07-29 Wilo Gmbh Centrifugal pump with butterfly valve
DE19851343A1 (en) * 1998-11-06 2000-05-11 Wilo Gmbh Centrifugal pump with butterfly valve
WO2014171809A2 (en) * 2013-04-19 2014-10-23 Bombas Internacionales Mexicanas, S.A De C.V. Vertical in-line multistage centrifugal pump
CN106438377B (en) * 2016-09-29 2018-11-27 周宁县善长祥农业机械研发有限公司 Vertical multi-stage bivalve centrifugal pump and its application method
US12078185B2 (en) 2019-05-29 2024-09-03 Fluid Handling Llc Bearing-less turbine
CN112253471A (en) * 2020-10-26 2021-01-22 长沙中联泵业股份有限公司 High-temperature high-pressure multi-stage pump

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FR2105910A5 (en) * 1970-09-16 1972-04-28 Worthington Corp
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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2776342A1 (en) * 1998-03-18 1999-09-24 Sarl Cg Promo Star Self-priming centrifugal pump
EP1431584A2 (en) * 2002-12-18 2004-06-23 Bogemar, S.L. Multi-stage electric pump
EP1431584A3 (en) * 2002-12-18 2005-07-27 Bogemar, S.L. Multi-stage electric pump
EP2112380A1 (en) 2008-04-21 2009-10-28 DP Industries B.V. Multi-stage centrifugal pump of the in line-type
EP2916008A1 (en) * 2014-03-07 2015-09-09 CALPEDA S.p.A. Improved electric pump particularly suitable for pumping liquids containing solid impurities
CN106321448A (en) * 2016-09-29 2017-01-11 周宁县善长祥农业机械研发有限公司 Multi-stage water pump and using method thereof
CN106545496A (en) * 2016-09-29 2017-03-29 周宁县善长祥农业机械研发有限公司 Sleeping suction multi-stage pipeline pump
WO2023151114A1 (en) * 2022-02-10 2023-08-17 浙江水泵总厂有限公司 Pump body structure and centrifugal pump having same
CN117967579A (en) * 2024-04-01 2024-05-03 烟台大学 High-pressure high-lift pump with external liquid collecting pipe
CN117967579B (en) * 2024-04-01 2024-06-11 烟台大学 A high-pressure and high-lift pump with an external collecting pipe

Also Published As

Publication number Publication date
ES2119237T3 (en) 1998-10-01
EP0664398B1 (en) 1998-07-22
DE59502855D1 (en) 1998-08-27
DE4401658A1 (en) 1995-07-27

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