EP0623750A1 - Pump of the axial type - Google Patents

Pump of the axial type Download PDF

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Publication number
EP0623750A1
EP0623750A1 EP94106634A EP94106634A EP0623750A1 EP 0623750 A1 EP0623750 A1 EP 0623750A1 EP 94106634 A EP94106634 A EP 94106634A EP 94106634 A EP94106634 A EP 94106634A EP 0623750 A1 EP0623750 A1 EP 0623750A1
Authority
EP
European Patent Office
Prior art keywords
guide vanes
impeller
centrifugal pump
flow
leading edges
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP94106634A
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German (de)
French (fr)
Other versions
EP0623750B1 (en
Inventor
Jan Dr. Bernauer
Lech Dr. Bobowski
Karl Hahn
Horst SCHÄFER
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
KSB AG
Original Assignee
KSB AG
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Filing date
Publication date
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Publication of EP0623750A1 publication Critical patent/EP0623750A1/en
Application granted granted Critical
Publication of EP0623750B1 publication Critical patent/EP0623750B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D3/00—Axial-flow pumps
    • F04D3/005—Axial-flow pumps with a conventional single stage rotor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/52—Casings; Connections of working fluid for axial pumps
    • F04D29/54—Fluid-guiding means, e.g. diffusers
    • F04D29/548—Specially adapted for liquid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D7/00—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts

Definitions

  • the invention relates to a centrifugal pump of the axial type for conveying liquids containing fibrous constituents, a plurality of guide vanes being arranged in the direction of flow behind the impeller, the guide vanes extending between the outer and inner housings, and drive elements for the impeller being arranged within the inner housing.
  • Such a centrifugal pump is known for example from EPA 0 475 920.
  • This is limited to a motor pump unit, i. H. the guide vanes serve here at the same time for holding a motor housing; in principle, however, the type corresponds to the generally known type of axial pump with a housing part arranged downstream of the impeller and having guide vanes.
  • the leading edges of the guide vanes are inclined to the rear in the flow direction. This is to avoid that the admixtures in the water during wastewater production get caught as far away from the impeller on the guide vanes.
  • the invention is therefore based on the problem of developing a solution for generic centrifugal pumps with the aid of which trouble-free operation in the conveyance of media containing fibrous components is ensured. This object is achieved in accordance with the characterizing part of the main claim.
  • the wipers or cutting devices rotating with the impeller hub and in connection with the leading edges of the guide blades inclined against the direction of flow ensure that entrained admixtures of the conveying medium are transported to the hub at the guide blade edges.
  • the guide vane edges are designed in such a way that fiber parts striking them either slide off or slide along them in the direction of the inner housing. In its area they are then removed from the scraper and / or the cutting device and can easily flow through the stator. This ensures for every operating state that the idler wheel remains free of accumulations influencing the performance data.
  • claims 2 and 3 describe the inclination of the leading edges in guide vanes which do not run in a purely radial direction. Their inclination improves the hydraulic efficiency of the pump.
  • the guide vanes are sometimes only attached to the outer housing.
  • fibers sliding along the leading edge of the guide vane between the inner housing and the end of the guide vane from the guide vane slip off.
  • the only one-sided mounting of the guide vane on the outer casing ensures that any fibers sticking to it slide off safely.
  • the centrifugal pump shown in FIG. 1 has an outer housing 1, within which an inner housing 2 is held by means of guide vanes 3.
  • the inner housing 2 accommodates drive elements, not shown, by which the impeller 4 is driven.
  • the drive elements can be a shaft with bearings, a drive motor driving the impeller, or similar drive elements.
  • a stripping or cutting device 5 is attached behind the impeller 4. This can be arranged directly on the hub of the impeller or can be part of a component connected to the hub and driven by it.
  • the scraper and / or the cutting device 5 is arranged in the hub area which lies opposite the inner housing 2. Furthermore, the leading edges 6 of the guide vanes 3 also begin in this area.
  • a plurality of cams are attached to the flow-side end of the hub 7, with which cams are located on the leading edge 6 in the region of the inner housing 2 accumulating fiber parts are removable.
  • a stripping or cutting device or a combination of both can be used.
  • FIG. 2 shows a view according to arrow X of FIG. 1.
  • fibers 8 are guided into the guide wheel channels 9 by the cutting or stripping device that passes by and washed away.
  • the dashed arrow corresponds to the direction of rotation of the impeller, not shown here.
  • the guide vanes 3 are here - starting from the point of attachment on the inner housing 2 - inclined in the circumferential direction against the direction of rotation of the impeller.
  • the conveying medium emerging from the impeller 2 thus supports the sliding of the fibers along the leading edges towards the cutting or stripping device.
  • this solution also works with stator blades that extend in the radial direction between the outer and inner housing.
  • FIG. 3 Another embodiment is shown in FIG. 3.
  • a total of six guide vanes 3.1, 3.2 are used here, only every second guide vane 3.2 connecting the inner housing 2 to the outer housing 1.
  • the other guide vanes 3.1 are only attached to the outer housing 1. Fibers sliding along it can then slide in the gap 10 between the inner housing 2 and guide vanes 3.1 from the guide vanes and flow away with the flow.

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

Abstract

In an axial-flow centrifugal pump, the impeller (pump rotor) is equipped with a scraper device and/or cutting device (5) which removes fibres deposited on the downstream diffuser blades (guide vanes) (3). <IMAGE>

Description

Die Erfindung betrifft eine Kreiselpumpe axialer Bauart zur Förderung von faserige Bestandteile enthaltende Flüssigkeiten, wobei in Strömungsrichtung hinter dem Laufrad eine Mehrzahl von Leitschaufeln angeordnet sind, die Leitschaufeln sich zwischen Außen- und Innengehäuse erstrecken und innerhalb des Innengehäuses Antriebselemente für das Laufrad angeordnet sind.The invention relates to a centrifugal pump of the axial type for conveying liquids containing fibrous constituents, a plurality of guide vanes being arranged in the direction of flow behind the impeller, the guide vanes extending between the outer and inner housings, and drive elements for the impeller being arranged within the inner housing.

Eine derartige Kreiselpumpe ist beispielsweise aus der EPA 0 475 920 bekannt. Diese beschränkt sich zwar auf ein Motorpumpenaggregat, d. h. die Leitschaufeln dienen hier gleichzeitig zur Halterung eines Motorgehäuses; im Prinzip entspricht die Bauart jedoch der allgemein bekannten Axialpumpenbauart mit einem dem Laufrad nachgeordneten, Leitschaufeln aufweisenden Gehäuseteil. Um Verstopfungen durch faserige Bestandteile zu vermeiden, sind die Anströmkanten der Leitschaufeln in Strömungsrichtung gesehen nach hinten geneigt. Damit soll vermieden werden, daß die bei der Abwasserförderung im Wasser befindlichen Beimengungen sich möglichst weit entfernt vom Laufrad an den Leitschaufeln verfangen.Such a centrifugal pump is known for example from EPA 0 475 920. This is limited to a motor pump unit, i. H. the guide vanes serve here at the same time for holding a motor housing; in principle, however, the type corresponds to the generally known type of axial pump with a housing part arranged downstream of the impeller and having guide vanes. In order to avoid blockages due to fibrous components, the leading edges of the guide vanes are inclined to the rear in the flow direction. This is to avoid that the admixtures in the water during wastewater production get caught as far away from the impeller on the guide vanes.

Dieses Prinzip der rückwärts gekrümmten Leitschaufeln bei axial durchströmten Maschinen ist bereits seit langem durch die DE-PS 459 798 bekannt. Hierbei sind ebenfalls die Befestigungspunkte der Leitschaufeln am Außengehäuse sehr weit hinter das Laufrad verlegt, um somit eine Ansammlung von Feststoffen zu verhindern bzw. möglichst weit entfernt vom Laufrad stattfinden zu lassen. Beide Gestaltungen vermögen aber immer noch nicht das Problem zu lösen, daß trotzdem Anhäufungen von faserigen Bestandteilen innerhalb des Leitrades am Übergang zwischen Leitschaufel und Gehäuse stattfinden und damit die Leistung der Pumpe negativ beeinflußt wird.This principle of the backward curved guide vanes in machines with axial flow has long been known from DE-PS 459 798. Here, too, the attachment points of the guide vanes on the outer housing are laid very far behind the impeller in order to prevent the accumulation of solids or to allow them to take place as far away from the impeller as possible. Both designs are capable but still not to solve the problem that nevertheless accumulations of fibrous constituents take place within the stator at the transition between the guide vane and the housing and thus the performance of the pump is adversely affected.

Der Erfindung liegt daher das Problem zugrunde, für gattungsgemäße Kreiselpumpen eine Lösung zu entwickeln, mit deren Hilfe ein problemloser Betrieb bei der Förderung von faserige Bestandteile enthaltenden Medien gewährleistet wird. Die Lösung dieser Aufgabe erfolgt gemäß dem kennzeichnenden Teil des Hauptanspruches.The invention is therefore based on the problem of developing a solution for generic centrifugal pumps with the aid of which trouble-free operation in the conveyance of media containing fibrous components is ensured. This object is achieved in accordance with the characterizing part of the main claim.

Durch die mit der Laufradnabe rotierenden Abstreifer oder Schneideinrichtungen sowie in Verbindung mit den gegen die Strömungsrichtung geneigten Anströmkanten der Leitschaufeln wird sichergestellt, daß an den Leitschaufelkanten sich verfangende Beimengungen des Fördermediums zur Nabe hin transportiert werden. Die Leitschaufelkanten sind so ausgebildet, daß daran auftreffende Faserteile entweder abgleiten oder daran entlang in Richtung Innengehäuse gleiten. In dessen Bereich werden sie dann vom Abstreifer und/oder der Schneideinrichtung entfernt und können problemlos durch das Leitrad abfließen. Somit wird für jeden Betriebszustand gewährleistet, daß das Leitrad frei von die Leistungsdaten beeinflussenden Ansammlungen bleibt.The wipers or cutting devices rotating with the impeller hub and in connection with the leading edges of the guide blades inclined against the direction of flow ensure that entrained admixtures of the conveying medium are transported to the hub at the guide blade edges. The guide vane edges are designed in such a way that fiber parts striking them either slide off or slide along them in the direction of the inner housing. In its area they are then removed from the scraper and / or the cutting device and can easily flow through the stator. This ensures for every operating state that the idler wheel remains free of accumulations influencing the performance data.

Die Ausgestaltungen der Ansprüche 2 und 3 beschreiben die Neigung der Anströmkanten bei Leitschaufeln, die nicht in rein radialer Richtung verlaufen. Deren Neigung verbessert den hydraulischen Wirkungsgrad der Pumpe.The embodiments of claims 2 and 3 describe the inclination of the leading edges in guide vanes which do not run in a purely radial direction. Their inclination improves the hydraulic efficiency of the pump.

Nach einer anderen Ausgestaltung sind die Leitschaufeln teilweise nur am Außengehäuse befestigt. Somit können an der Anströmkante der Leitschaufel entlanggleitende Fasern zwischen Innengehäuse und Leitschaufelende von der Leitschaufel abrutschen. Durch die nur einseitige Leitschaufelbefestigung am Außengehäuse ist ein sicheres Abrutschen eventuell daran anhaftender Fasern gewährleistet.According to another embodiment, the guide vanes are sometimes only attached to the outer housing. Thus, fibers sliding along the leading edge of the guide vane between the inner housing and the end of the guide vane from the guide vane slip off. The only one-sided mounting of the guide vane on the outer casing ensures that any fibers sticking to it slide off safely.

Ausführungsbeispiele der Erfindung sind in den Zeichnungen dargestellt und werden im folgenden näher beschrieben. Es zeigen die

Fig. 1
einen Längsschnitt durch eine Strömungsmaschine, die
Fig. 2 und 3
zwei Ansichten von der Druckseite auf die Leitrad-Anordnung.
Embodiments of the invention are shown in the drawings and are described in more detail below. They show
Fig. 1
a longitudinal section through a turbomachine, the
2 and 3
two views from the pressure side of the stator arrangement.

Die in Fig. 1 gezeigte Kreiselpumpe axialer Bauart verfügt über ein Außengehäuse 1, innerhalb dessen ein Innengehäuse 2 mittels Leitschaufeln 3 gehalten ist. Das Innengehäuse 2 nimmt hier nicht weiter dargestellte Antriebselemente auf, von denen das Laufrad 4 angetrieben wird. Bei den Antriebselementen kann es sich um eine Welle mit Lagerungen, ein das Laufrad antreibender Antriebsmotor oder ähnliche Antriebselemente handeln.The centrifugal pump shown in FIG. 1 has an outer housing 1, within which an inner housing 2 is held by means of guide vanes 3. The inner housing 2 accommodates drive elements, not shown, by which the impeller 4 is driven. The drive elements can be a shaft with bearings, a drive motor driving the impeller, or similar drive elements.

In Strömungsrichtung gesehen hinter dem Laufrad 4 ist eine Abstreif- oder eine Schneideinrichtung 5 angebracht. Diese kann direkt auf der Nabe des Laufrades angeordnet sein oder Bestandteil eines mit der Nabe in Verbindung stehenden sowie davon angetriebenen Bauteiles sein.Viewed in the direction of flow, a stripping or cutting device 5 is attached behind the impeller 4. This can be arranged directly on the hub of the impeller or can be part of a component connected to the hub and driven by it.

Die Abstreif- und/oder die Schneideinrichtung 5 ist in demjenigen Nabenbereich angeordnet, der dem Innengehäuse 2 gegenüberliegt. Des weiteren beginnen in diesem Bereich auch die Anströmkanten 6 der Leitschaufeln 3. Bei der hier Anwendung findenden Abstreifeinrichtung sind am strömungsseitigen Ende der Nabe 7 mehrere Nocken angebracht, mit denen an der Anströmkante 6 im Bereich des Innengehäuses 2 sich ansammelnde Faserteile entfernbar sind. In Abhängigkeit von dem Fördermedium kann eine Abstreif-, Schneideinrichtung oder eine Kombination von beiden Verwendung finden.The scraper and / or the cutting device 5 is arranged in the hub area which lies opposite the inner housing 2. Furthermore, the leading edges 6 of the guide vanes 3 also begin in this area. In the stripping device used here, a plurality of cams are attached to the flow-side end of the hub 7, with which cams are located on the leading edge 6 in the region of the inner housing 2 accumulating fiber parts are removable. Depending on the medium to be conveyed, a stripping or cutting device or a combination of both can be used.

Die Fig. 2 zeigt eine Ansicht gemäß Pfeil X von Fig. 1. Im Bereich des Innengehäuses 2 an den Anströmkanten der Leitschaufeln 3 angesammelte Fasern 8 werden durch die daran vorbeistreichende Schneid- oder Abstreifeinrichtung in die Leitradkanäle 9 geleitet und weggespült. Der gestrichelte Pfeil entspricht der Drehrichtung des hier nicht dargestellten Laufrades. Die Leitschaufeln 3 sind hierbei - ausgehend vom Befestigungspunkt am Innengehäuse 2 - in Umfangsrichtung gegen die Drehrichtung des Laufrades geneigt. Somit unterstützt das aus dem Laufrad 2 austretende Fördermedium das Entlanggleiten der Fasern an den Anströmkanten zur Schneid- oder Abstreifeinrichtung hin. Selbstverständlich funktioniert diese Lösung auch bei Leitradschaufeln, die sich in radialer Richtung zwischen Außen- und Innengehäuse erstrecken.FIG. 2 shows a view according to arrow X of FIG. 1. In the area of the inner housing 2 at the leading edges of the guide vanes 3, fibers 8 are guided into the guide wheel channels 9 by the cutting or stripping device that passes by and washed away. The dashed arrow corresponds to the direction of rotation of the impeller, not shown here. The guide vanes 3 are here - starting from the point of attachment on the inner housing 2 - inclined in the circumferential direction against the direction of rotation of the impeller. The conveying medium emerging from the impeller 2 thus supports the sliding of the fibers along the leading edges towards the cutting or stripping device. Of course, this solution also works with stator blades that extend in the radial direction between the outer and inner housing.

Eine andere Ausführungsform ist in der Fig. 3 gezeigt. Hierbei finden insgesamt sechs Leitschaufeln 3.1, 3.2 Anwendung, wobei nur jede zweite Leitschaufel 3.2 das Innengehäuse 2 mit dem Außengehäuse 1 verbindet. Die anderen Leitschaufeln 3.1 sind nur am Außengehäuse 1 befestigt. Daran entlanggleitende Fasern können dann im Spalt 10 zwischen Innengehäuse 2 und Leitschaufeln 3.1 von den Leitschaufeln abgleiten und mit der Strömung abfließen.Another embodiment is shown in FIG. 3. A total of six guide vanes 3.1, 3.2 are used here, only every second guide vane 3.2 connecting the inner housing 2 to the outer housing 1. The other guide vanes 3.1 are only attached to the outer housing 1. Fibers sliding along it can then slide in the gap 10 between the inner housing 2 and guide vanes 3.1 from the guide vanes and flow away with the flow.

Claims (4)

Kreiselpumpe axialer Bauart zur Förderung von faserige Bestandteile enthaltende Flüssigkeiten, wobei in Strömungsrichtung hinter dem Laufrad eine Mehrzahl von Leitschaufeln angeordnet sind, die Leitschaufeln sich zwischen Außengehäuse und Innengehäuse erstrecken, und innerhalb des Innengehäuses Antriebselemente für das Laufrad angeordnet sind, dadurch gekennzeichnet, daß an der Laufradnabe (7) in demjenigen Bereich, der dem Innengehäuse (2) gegenüberliegt, eine Abstreif- und/oder Schneideinrichtung (5) angebracht ist und daß die Leitschaufeln (3) mit ihren Anströmkanten (6) in Strömungsrichtung ganz oder teilweise nach vorn geneigt sind.Centrifugal pump of axial design for conveying liquids containing fibrous components, wherein a plurality of guide vanes are arranged in the flow direction behind the impeller, the guide vanes extend between the outer housing and the inner housing, and drive elements for the impeller are arranged within the inner housing, characterized in that on the Impeller hub (7) in the area opposite the inner casing (2), a scraper and / or cutting device (5) is attached and that the guide vanes (3) with their leading edges (6) are inclined fully or partially forward in the direction of flow . Kreiselpumpe nach Anspruch 1, dadurch gekennzeichnet, daß die Anströmkanten (6) in Umfangsrichtung gegen die Drehrichtung des Laufrades (4) geneigt sind.Centrifugal pump according to claim 1, characterized in that the leading edges (6) are inclined in the circumferential direction against the direction of rotation of the impeller (4). Kreiselpumpe nach Anspruch 1, dadurch gekennzeichnet, daß die Anströmkanten in Meridionalkontur gegen die Strömungsrichtung nach vorne geneigt sind.Centrifugal pump according to claim 1, characterized in that the leading edges in the meridional contour are inclined forward against the direction of flow. Kreiselpumpe nach Anspruch 1 bis 3, dadurch gekennzeichnet, daß die Leitschaufeln (3.1) teilweise nur am Außengehäuse (1) befestigt sind.Centrifugal pump according to Claims 1 to 3, characterized in that the guide vanes (3.1) are in some cases only attached to the outer housing (1).
EP94106634A 1993-05-03 1994-04-28 Pump of the axial type Expired - Lifetime EP0623750B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4314477 1993-05-03
DE4314477A DE4314477A1 (en) 1993-05-03 1993-05-03 Centrifugal pump of axial design

Publications (2)

Publication Number Publication Date
EP0623750A1 true EP0623750A1 (en) 1994-11-09
EP0623750B1 EP0623750B1 (en) 1998-07-29

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EP94106634A Expired - Lifetime EP0623750B1 (en) 1993-05-03 1994-04-28 Pump of the axial type

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DE (2) DE4314477A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1256517A1 (en) * 1997-10-09 2002-11-13 Ishigaki Company Limited Blockage preventing apparatus for water jet propulsion unit
WO2011022249A1 (en) * 2009-08-21 2011-02-24 Exxonmobil Chemical Patents Inc. Clog-resistant pump assembly for slurry loop reactor
NL2003467C2 (en) * 2009-09-10 2011-03-14 Nijhuis Pompen B V FISH-FRIENDLY PUMP OR TURBINE DEVICE.

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19510811A1 (en) * 1995-03-24 1996-09-26 Klein Schanzlin & Becker Ag Fiber-repellent wall surface design

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE501662C (en) * 1930-07-05 Koester Friedrich Screw or propeller pump
GB386626A (en) * 1930-04-24 1933-01-19 Maschf Augsburg Nuernberg Ag Improvements in helical blade conveyors
FR2279954A1 (en) * 1974-07-23 1976-02-20 Itt PROPELLER PUMP
FR2628484A1 (en) * 1988-03-09 1989-09-15 Borreguero Raphael Water turbine for driving small boat - incorporates system to chop up any vegetation entering it
EP0512190A1 (en) * 1990-04-02 1992-11-11 Itt Flygt Ab Clog resistant pump

Family Cites Families (10)

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Publication number Priority date Publication date Assignee Title
DE500266C (en) * 1930-06-23 Koester Friedrich Propeller that works in a housing
DE459798C (en) * 1928-05-14 Koester Friedrich Diffuser for screw pumps
DE547239C (en) * 1930-02-16 1932-03-30 Carl Pape Arrangement of color filters for naturally colored films
US3170646A (en) * 1963-01-04 1965-02-23 Frederick H Springer Portable pump
US4063849A (en) * 1975-02-12 1977-12-20 Modianos Doan D Non-clogging, centrifugal, coaxial discharge pump
SU798359A1 (en) * 1978-12-08 1981-01-23 Латвийский Научно-Исследовательскийинститут Механизации И Электрифика-Ции Сельского Хозяйства Centrifugal pump for pumping non-uniform media with fibrous inclusions
SU1317183A1 (en) * 1985-07-17 1987-06-15 Карагандинское Производственное Объединение По Добыче Угля "Карагандауголь" Pump for transferring heterogeneous media
DE3608229A1 (en) * 1986-03-12 1987-09-17 Klein Schanzlin & Becker Ag BLADE FOR AN AXIAL CENTRIFUGAL PUMP
SU1488594A1 (en) * 1986-10-02 1989-06-23 Vnii Mekh Selskogo Khoz Centrifugal pump for nonhomogeneous fiber-containing fluids
SE466768B (en) * 1990-09-12 1992-03-30 Flygt Ab Itt AXIAL TYPE RELEASED PUMP

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE501662C (en) * 1930-07-05 Koester Friedrich Screw or propeller pump
GB386626A (en) * 1930-04-24 1933-01-19 Maschf Augsburg Nuernberg Ag Improvements in helical blade conveyors
FR2279954A1 (en) * 1974-07-23 1976-02-20 Itt PROPELLER PUMP
FR2628484A1 (en) * 1988-03-09 1989-09-15 Borreguero Raphael Water turbine for driving small boat - incorporates system to chop up any vegetation entering it
EP0512190A1 (en) * 1990-04-02 1992-11-11 Itt Flygt Ab Clog resistant pump

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1256517A1 (en) * 1997-10-09 2002-11-13 Ishigaki Company Limited Blockage preventing apparatus for water jet propulsion unit
WO2011022249A1 (en) * 2009-08-21 2011-02-24 Exxonmobil Chemical Patents Inc. Clog-resistant pump assembly for slurry loop reactor
US8124019B2 (en) 2009-08-21 2012-02-28 Exxonmobil Chemical Patents Inc. Clog-resistant pump assembly for slurry loop reactor
NL2003467C2 (en) * 2009-09-10 2011-03-14 Nijhuis Pompen B V FISH-FRIENDLY PUMP OR TURBINE DEVICE.
EP2295808B1 (en) * 2009-09-10 2016-06-08 Nijhuis Pompen BV Fish friendly pump or turbine apparatus
EP2295808B2 (en) † 2009-09-10 2019-11-20 Nijhuis Pompen BV Fish friendly pump or turbine apparatus

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DE59406531D1 (en) 1998-09-03
DE4314477A1 (en) 1994-11-10
EP0623750B1 (en) 1998-07-29

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