EP0664398B1 - Centrifugal pump with backflow prevention valve - Google Patents
Centrifugal pump with backflow prevention valve Download PDFInfo
- Publication number
- EP0664398B1 EP0664398B1 EP95100590A EP95100590A EP0664398B1 EP 0664398 B1 EP0664398 B1 EP 0664398B1 EP 95100590 A EP95100590 A EP 95100590A EP 95100590 A EP95100590 A EP 95100590A EP 0664398 B1 EP0664398 B1 EP 0664398B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- centrifugal pump
- pump according
- stage
- last
- annular
- 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
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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
- 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 in particular to a multi-stage centrifugal pump multi-stage inline pump with the impeller shaft Storage and with a backflow preventing valve, the medium emerging from the last stage is pressed into an annular space surrounding the steps, from which it flows to the outlet.
- Inline pumps are in the prior art from DE 93 10 091, US 4,244,675 known.
- the object of the invention is a pump of the beginning to improve the type mentioned so that at simple Construction, small size and simple assembly only slight within the valve Flow velocities occur so that low Losses and noises arise.
- the return valve can flow in the direction of flow behind the pump, especially behind the last one Pump stage and close to the bearing and / or the Shaft seal can be arranged that the pump suction and discharge nozzle is facing away.
- the check valve in Flow direction behind the pump, especially behind the last pump stage and near or in that Annulus outlet, especially near the first pump stage is arranged.
- Such a diaphragm valve does not need an additional one Housing and can despite the small external dimensions Overall pump be designed relatively oversized, which means low flow rates and thus a low resistance arises, so that flow losses and noises remain very low.
- Reflux valve with a ring membrane surrounding a chamber in which the pump in particular the last pump stage promotes. It is also advantageously proposed that the support surface for the ring membrane from within the ring membrane, conically shaped on the outside Support part is formed with flow openings.
- the ring membrane at the same time the pump housing seal between the Annulus surrounding cylinder (casing) and that Shaft-sealing supporting housing part forms. With that comes the ring membrane has a double function.
- each a manually operated shut-off valve in particular one flap valve is arranged.
- the pump hydraulics with the integrated Check valve completely closed for revision be so that assembly or disassembly and repair are greatly relieved.
- the flaps are reached when the locking piece especially the flap from a sealing sleeve flexible material is surrounded, at least the nozzle partially lined.
- the sealing sleeve outwards beyond the sealing surface of the connection flange be guided so that the sealing material of both Sealing the flap and the connection serves.
- FIG. 1 and 2 has a package of pump stages 1, one after the other are switched and the wheels 2 on one Impeller shaft 3, which are supported by a bearing 4 is.
- the close to the suction port 6 and pressure port 7 bearing 4 is located approximately in the area of the first pump stage, and the one removed from the suction and discharge port Shaft seal 5 is in the area of the rear housing part 8 attached, which is also called "pump lantern".
- the last pump stage pumps into an annular chamber 9, which is surrounded by a support member 10 and through which the impeller shaft 3 runs coaxially.
- the Support member 10 is conically shaped, being closer to the Stub 6.7 has a smaller diameter than in more distant area.
- the support member 10 has numerous flow openings 11, and at its On the outside there is a non-pump correspondingly conically shaped flexible membrane 12. This membrane is from the support part when the pump is pumping 10 lifted outwards, so that the pumped medium in can enter an annular space 13, all pump stages outside coaxially surrounds.
- the outer surface of the annulus 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 Pressure port 7, like the suction port 6 of one Terminal housing 15 is formed.
- Suction nozzle 6 and Pressure port 7 are in the connection housing to each other aligned, so that the multi-stage centrifugal pump one In-line pump is.
- the ring membrane 12 forms with its outer annular At the same time end the pump housing seal between the the cylindrical housing jacket 14 surrounding the annular space 13 and the rear housing part 8.
- the support surface forming component or support member 10 is in Embodiment according to Figures 1 and 2 in one piece with the Housing part 8 executed and can be made together with this Cast metal.
- the support member 10 consists of a Deep-drawn sheet metal part that is between the last pump stage and the housing part 8 is mounted.
- each rotatable flap 16, 17 stored in each case a rotatable flap 16, 17 stored.
- the inside of each socket 6,7 is in the area of the flap 16,17 Sealing sleeve 22.23 lined accordingly is cylindrical.
- the outer end of the two Cuffs 22,23 is so far outwards over the Sealing surface of the flange led each nozzle that the Cuff there an annular sealing surface 24.25 forms.
- Embodiment is particularly the last Pump stage the support surface for the ring membrane, so that the support part 10 is formed by this pump stage.
- the suction and Pressure port 6.7 is close.
- an intermediate part (flange part) 28 which the housing part 8 and the housing part 27 opposite sides are screwed.
- the Flange part 28 forms an inside with its support part 10 coaxial conical support surface for the ring membrane 12, the ring membrane in the closed state on the Support part 10 rests.
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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)
Description
Die Erfindung betrifft eine mehrstufige 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 Stufen umgebenden Ringraum gedrückt wird, von dem es zum Auslauf strömt.The invention relates in particular to a multi-stage centrifugal pump multi-stage inline pump with the impeller shaft Storage and with a backflow preventing valve, the medium emerging from the last stage is pressed into an annular space surrounding the steps, from which it flows to the outlet.
Inline-Pumpen sind im Stand der Technik aus DE 93 10 091, US 4,244,675 bekannt.Inline pumps are in the prior art from DE 93 10 091, US 4,244,675 known.
Ein-Wege-Ventile, in denen Membranflächen zur Dichtung verwendet werden, sind darüber hinaus aus der WO 86/04399 bekannt.One-way valves, in which membrane surfaces for sealing are also used from WO 86/04399 known.
Es ist außerdem bekannt, bei derartigen mehrstufigen Kreiselpumpen ein den Rückfluß verhinderndes Ventil in demjenigen Pumpengehäuseteil anzuordnen, das den Saug- und Druckstutzen bildet, siehe z.B. US-Patent 5 201 633 und GB 1,066,594. Der Einbau eines solchen Ventils ist verhältnismäßig aufwendig und platzraubend.It is also known in such multi-stage Centrifugal pumps a backflow preventing valve in to arrange that pump housing part that the suction and Pressure port forms, see e.g. U.S. Patent 5,201,633 and GB 1,066,594. The installation of such a valve is relatively complex and space-consuming.
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 a pump of the beginning to improve the type mentioned so that at simple Construction, small size and simple assembly only slight within the valve Flow velocities occur so that low Losses and noises arise.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß das den Rückfluß verhindernde Ventil eine in Strömungsrichtung hinter der letzten Pumpstufe im Ringraum koaxial zur Pumpwelle angeordnete konische Ringmembran aufweist, deren dem Saug- und Druckstutzen abgewandte Seite befestigt und deren andere Seite beweglich ist.This object is achieved in that the backflow preventing valve one in Flow direction behind the last pump stage in Annular space arranged conically to the pump shaft Has ring membrane, the suction and Pressure port facing away and attached other side is movable.
Hierdurch wird in besonders strömungsfähiger Weise erreicht, daß sich die Ringmembran in Strömungsrichtung öffnen kann.This is particularly flowable achieved that the ring membrane in the direction of flow can open.
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.The return valve can flow in the direction of flow behind the pump, especially behind the last one Pump stage and close to the bearing and / or the Shaft seal can be arranged that the pump suction and discharge nozzle is facing away.
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 check valve in Flow direction behind the pump, especially behind the last pump stage and near or in that Annulus outlet, especially near the first pump stage is arranged.
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 need an additional one Housing and can despite the small external dimensions Overall pump be designed relatively oversized, which means low flow rates and thus a low resistance arises, 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 that Reflux valve with a ring membrane surrounding a chamber in which the pump in particular the last pump stage promotes. It is also advantageously proposed that the support surface for the ring membrane from within the ring membrane, conically shaped on the outside Support part is formed with flow openings.
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 then given when the supporting part forming the supporting surfaces to which the shaft seal-bearing component is attached. A reduction in components is achieved if that the support part forming the support surface with the Shaft seal-bearing component is in one piece.
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 an advantage if the support surfaces forming support part is a deep-drawn sheet metal part or a cast part is.
Die Konstruktion wird noch einfacher und mit geringeren Abmessungen, wenn die letzte Pumpenstufe die Stützfläche für die Ringmembran bildet.The construction becomes even simpler and with less Dimensions if the last pump stage is the support surface for the ring membrane.
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 ring membrane at the same time the pump housing seal between the Annulus surrounding cylinder (casing) and that Shaft-sealing supporting housing part forms. With that comes the ring membrane has a double function.
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 in the suction and Discharge nozzle each a manually operated shut-off valve, in particular one flap valve is arranged. In order to can the pump hydraulics with the integrated Check valve completely closed for revision be so that assembly or disassembly and repair are greatly relieved.
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.With the simplest construction, high tightness is achieved the flaps are reached when the locking piece especially the flap from a sealing sleeve flexible material is surrounded, at least the nozzle partially lined. Here, the sealing sleeve outwards beyond the sealing surface of the connection flange be guided so that the sealing material of both Sealing the flap and the connection serves.
Zwei Ausführungsbeispiele der Erfindung sind in den Zeichnungen in axialen Schnitten dargestellt und werden im folgenden näher beschrieben.Two embodiments of the invention are in the Drawings are shown 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.
- 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 embodiment of Figures 1 and 2 has
a package of
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
Stutzen 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 pumps into an
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
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.The
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
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, not shown
Embodiment is particularly the last
Pump stage the support surface for the ring membrane, so that
the
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 embodiment of Figure 5 is the ring membrane
arranged at the end of the annulus, the suction and
Pressure port 6.7 is close. Between the
Claims (16)
- A multistage centrifugal pump having bearings (4) bearing the impeller shaft and a valve (10-12) preventing backflow, the pumping medium emerging from the last stage being forced into an annular space (13) which encloses the stages and from which it flows to the outlet, characterised in that the valve (10-12) preventing backflow has a conical annular membrane which is disposed coaxially of the pump shaft in the annular space downstream of the last pump stage in the direction of flow and whose side remote from the intake and delivery spigots (6, 7) is attached, its other side being movable.
- A centrifugal pump according to claim 1, characterised in that the backflow valve (10-12) is disposed in the direction of flow downstream of the last pump stage and adjacent that bearing and/or shaft seal (5) which is remote from the pump intake and deliver spigots (6, 7).
- A centrifugal pump according to claim 1, characterised in that the backflow valve (10-12) is disposed in the direction of flow downstream of the last pump stage and adjacent or in the annular space outlet, more particularly adjacent the first part of the stage.
- A centrifugal pump according to one of the preceding claims, characterised in that the backflow valve (10-12) encloses by an annular membrane (12) a chamber (9) into which the pump, more particularly the last pump stage, delivers.
- A centrifugal pump according to one of the preceding claims, characterised in that the supporting surface for the annular membrane (12) is formed by an outwardly conically shaped supporting member (10) with throughflow openings (11) which is disposed inside the annular membrane.
- A centrifugal pump according to claim 5, characterised in that the supporting member (10) forming the supporting surfaces is attached to the constructional member (8) bearing the shaft seal.
- A centrifugal pump according to claim 5, characterised in that the supporting member (10) forming the supporting surfaces is unitary with the constructional member (8) bearing the shaft seal.
- A centrifugal pump according to one of the preceding claims, characterised in that the annular membrane (12) encloses the last pump stage.
- A centrifugal pump according to one of the preceding claims, characterised in that the supporting member (10) forming the supporting surfaces is a deep-drawn sheet metal member or a casting.
- A centrifugal pump according to one of the preceding claims, characterised in that a pump stage, more particularly the last pump stage, forms the supporting surface for the annular membrane (12).
- A centrifugal pump according to one of the preceding claims, characterised in that a member (26) enclosing the pump chamber inlet forms the supporting surface for the annular membrane (12).
- A centrifugal pump according to one of the preceding claims, characterised in that the annular membrane (12) at the same time forms the pump casing seal between the cylinder (casing jacket (14)) enclosing the annular space and the casing member (8) bearing the shaft seal.
- A centrifugal pump according to one of the preceding claims, characterised in that the annular membrane (12) is attached to a flange member which on one side is adjoined by the inlet/outlet casing (27) and on the other side by the casing jacket (14) enclosing the annular chamber.
- A centrifugal pump according to one of the preceding claims, characterised in that a manually operable flap valve (16, 17)is disposed in the intake and delivery spigots (6, 7) respectively.
- A centrifugal pump according to one of the preceding claims, characterised in that the closure member, more particularly the flap, is enclosed by a sealing collar (22, 23) of flexible material which at least partially lines the spigots (6, 7).
- A centrifugal pump according to one of the preceding claims, characterised in that the sealing collar (22, 23) extends outwardly as far as beyond the sealing surface (24, 25) of the connecting flange.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4401658A DE4401658A1 (en) | 1994-01-21 | 1994-01-21 | Centrifugal pump with backflow preventing valve |
| DE4401658 | 1994-01-21 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0664398A1 EP0664398A1 (en) | 1995-07-26 |
| EP0664398B1 true EP0664398B1 (en) | 1998-07-22 |
Family
ID=6508360
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP95100590A Expired - Lifetime EP0664398B1 (en) | 1994-01-21 | 1995-01-18 | Centrifugal pump with backflow prevention valve |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0664398B1 (en) |
| DE (2) | DE4401658A1 (en) |
| ES (1) | ES2119237T3 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106438377A (en) * | 2016-09-29 | 2017-02-22 | 周宁县善长祥农业机械研发有限公司 | Vertical multi-stage double-valve centrifugal pump and use method thereof |
| 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 |
| US12078185B2 (en) | 2019-05-29 | 2024-09-03 | Fluid Handling Llc | Bearing-less turbine |
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|---|---|---|---|---|
| DE19803162A1 (en) | 1998-01-28 | 1999-07-29 | Wilo Gmbh | Centrifugal pump with butterfly valve |
| FR2776342B1 (en) * | 1998-03-18 | 2001-04-20 | Sarl Cg Promo Star | CENTRIFUGAL PUMP WITH AUTOMATIC PRIMING |
| DE19851343A1 (en) * | 1998-11-06 | 2000-05-11 | Wilo Gmbh | Centrifugal pump with butterfly valve |
| ES1053407Y (en) * | 2002-12-18 | 2003-07-16 | Bogemar Sl | MULTICELLULAR PUMP. |
| EP2112380A1 (en) | 2008-04-21 | 2009-10-28 | DP Industries B.V. | Multi-stage centrifugal pump of the in line-type |
| WO2014171809A2 (en) * | 2013-04-19 | 2014-10-23 | Bombas Internacionales Mexicanas, S.A De C.V. | Vertical in-line multistage centrifugal pump |
| EP2916008B1 (en) * | 2014-03-07 | 2020-01-08 | CALPEDA S.p.A. | Improved electric pump particularly suitable for pumping liquids containing solid impurities |
| CN106545496B (en) * | 2016-09-29 | 2018-11-27 | 周宁县善长祥农业机械研发有限公司 | Sleeping suction multi-stage pipeline pump |
| CN106321448B (en) * | 2016-09-29 | 2018-06-15 | 周宁县善长祥农业机械研发有限公司 | Multi-stage water pump and its application method |
| CN114233635A (en) * | 2022-02-10 | 2022-03-25 | 浙江水泵总厂有限公司 | Pump body structure and centrifugal pump with same |
| CN117967579B (en) * | 2024-04-01 | 2024-06-11 | 烟台大学 | High-pressure high-lift pump with external liquid collecting pipe |
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| DE1528791A1 (en) * | 1963-04-19 | 1969-10-30 | Pomorska Odlewnia I Emaliernia | Check valve for deep well pumps |
| US3664759A (en) * | 1970-09-16 | 1972-05-23 | Worthington Corp | Self-adjusting backflow preventor for centrifugal pumps |
| US4244675A (en) * | 1979-04-30 | 1981-01-13 | Worthington Pump, Inc. | Multi-stage barrel type centrifugal pump with resilient compensator means for maintaining the seals between interstage pumping assemblies |
| DE8334283U1 (en) * | 1983-11-30 | 1984-03-01 | Klein, Schanzlin & Becker Ag, 6710 Frankenthal | CHECK VALVE |
| US4565214A (en) * | 1984-06-04 | 1986-01-21 | Dover Corporation | Flapper check valve assembly |
| ES8706248A1 (en) * | 1985-01-18 | 1987-05-16 | Andren Christopher Erik | Automatic one-way fluid valves. |
| DE8612405U1 (en) * | 1986-05-05 | 1986-07-31 | Guss- Und Armaturwerk Kaiserslautern Nachf. Karl Billand, 6750 Kaiserslautern | Device for connecting the pressure line of a pump in a sewage lifting system with a pipeline on the pump side |
| DE3729673A1 (en) * | 1987-09-04 | 1989-03-23 | Grundfos Int | MULTI-STAGE CENTRIFUGAL PUMP |
| FR2637024B1 (en) * | 1988-09-23 | 1994-04-01 | Olaer Industries | PUMPING SYSTEM, PARTICULARLY FOR IRRIGATION |
| FR2661218B1 (en) * | 1990-04-24 | 1992-07-31 | Salmson Pompes | VERTICAL CENTRIFUGAL PUMP ASSEMBLY. |
| DE9310091U1 (en) * | 1993-07-07 | 1993-09-23 | J. Hartlage GmbH & Co. KG, 49090 Osnabrück | VERTICAL CENTRIFUGAL PUMP |
-
1994
- 1994-01-21 DE DE4401658A patent/DE4401658A1/en not_active Withdrawn
-
1995
- 1995-01-18 ES ES95100590T patent/ES2119237T3/en not_active Expired - Lifetime
- 1995-01-18 DE DE59502855T patent/DE59502855D1/en not_active Expired - Fee Related
- 1995-01-18 EP EP95100590A patent/EP0664398B1/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106438377A (en) * | 2016-09-29 | 2017-02-22 | 周宁县善长祥农业机械研发有限公司 | Vertical multi-stage double-valve centrifugal pump and use method thereof |
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| ES2119237T3 (en) | 1998-10-01 |
| EP0664398A1 (en) | 1995-07-26 |
| DE59502855D1 (en) | 1998-08-27 |
| DE4401658A1 (en) | 1995-07-27 |
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