EP0653564B1 - Non-clogging centrifugal pump - Google Patents
Non-clogging centrifugal pump Download PDFInfo
- Publication number
- EP0653564B1 EP0653564B1 EP94103553A EP94103553A EP0653564B1 EP 0653564 B1 EP0653564 B1 EP 0653564B1 EP 94103553 A EP94103553 A EP 94103553A EP 94103553 A EP94103553 A EP 94103553A EP 0653564 B1 EP0653564 B1 EP 0653564B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- impeller
- centrifugal pump
- collar
- pump according
- inlet
- 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
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/426—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps
- F04D29/4273—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps suction eyes
-
- 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
- F04D29/18—Rotors
- F04D29/22—Rotors specially for centrifugal pumps
- F04D29/2238—Special flow patterns
- F04D29/225—Channel wheels, e.g. one blade or one flow channel
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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
- F04D7/00—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts
- F04D7/02—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type
- F04D7/04—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type the fluids being viscous or non-homogenous
- F04D7/045—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type the fluids being viscous or non-homogenous with means for comminuting, mixing stirring or otherwise treating
Definitions
- the invention relates to a centrifugal pump with a single-bladed impeller whose the drive shaft averted central suction mouth with the inlet opening of the Pump chamber is aligned, the inlet opening a annular collar that forms in the impeller interior protrudes so that the inner end of the Impeller blade with the outer jacket of the collar forms a narrow gap.
- Free flow pumps continue to have the peculiarity that Store solids in the middle of the impeller and Reduce free flow so that the pump in throttled operation is running. The pump itself is blocked not because the impeller with its end face far from the Wall of the pump housing is removed.
- Impellers with better efficiency are Single channel impellers that are only a single blade have. These impellers achieve efficiencies of over 70% if they are spatially curved. This spatial curvature means that the impellers are not can be turned off to other operating points to reach. Therefore one needs for each characteristic separate impeller and its own model in the foundry. Cylindrical impellers can be turned and have one somewhat lower efficiency than that spatially curved.
- the object of the invention is to provide a centrifugal pump type mentioned so that they improve simple design and manufacture to a high degree is free from constipation, Solids seized from the impeller automatically.
- Such a pump in particular does not become blocked Solids in the pumped medium that act as "pump shock" are referred to, such as plastic bags and Tights.
- the pump is therefore particularly suitable for Waste water of various types.
- that is cylindrical impeller of the pump according to the invention turnable.
- the Collar-forming insert at least in the form of a sleeve Area of the inlet that lines the impeller is facing.
- the impeller facing bottom of the chamber side wall in particular by a bottom plate, a spiral groove around the inlet forms around by between the impeller and Chamber side wall penetrating solids to the outside are movable. Be through such a spiral Solids that are between the bottom edge of the Squeeze the impeller and the chamber side wall through the spiral taken along and moved radially outwards, so that the impeller automatically gets stuck Solids free.
- the bottom plate facing end of the inner end of the Impeller blade above the ring gear with a small clearance lies. This should be on the outside of the ring gear border the spiral groove.
- the Width of the teeth and thus the ring gear about the same the width of the face of the inner end of the Impeller blade is, as well as the impeller blade end with is provided with a radius so that the fibrous material much can be drawn in more easily.
- a centrifugal pump has a pump housing 1, the one Pump chamber 2 forms in which an impeller 3 is mounted.
- the impeller 3 is not driven by a shaft 4 illustrated electric motor driven.
- the cylindrical and thus rotatable impeller 3 only has a single curved blade 7, the inside of which, i.e. The impeller axis 8 closer end 7a in close proximity of the edge of the inlet 6 rotates.
- the inner edge of the inlet 6 an annular collar 9, the a few millimeters in the impeller 3 and thus in the Suction mouth of the impeller 3 extends into it so that the collar 9 protrudes the inner end 7a by a few millimeters.
- the collar 9 preferably covers the inner one End 7a by 2 to 5, preferably by 2.5-3 millimeters.
- the collar 9 can directly from the pump chamber side wall 5 be formed or from a base plate 11 or an insert fastened in the base plate 11 12 ( Figure 1).
- the insert 12 can be socket-shaped line inlet 6.
- the insert 6 is on the inside the pump chamber side wall 5 from a spiral groove 13 surround the one with respect to the circulating liquid such spiral direction A has that between the Impeller blade and chamber side wall penetrating Solids are driven radially outward, like this the arrowed, dashed flow direction 14 in Figure 3 shows.
- the width b of the Sprocket approximately equal to the width B of the end face 16 is.
- the teeth of the ring gear 15 are approximately radial to the impeller axis 8, i.e. the (straight) Tooth flank lines of the teeth are arranged approximately radially.
- impeller blade front side a radius at the lower end receives, which causes the fibrous materials through the Impeller blade is retracted and forced to move to move outwards through the base plate design.
- the transition from the inner end 7a to the end face 16 is therefore rounded off, the rounding off the radius R having.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
Description
Die Erfindung betrifft eine Kreiselpumpe mit einem einschaufligen Laufrad, dessen der Antriebswelle abgewandter mittiger Saugmund mit der Einlaßöffnung der Pumpenkammer fluchtet, wobei die Einlaßöffnung einen ringförmigen Kragen bildet, der in das Laufradinnere derart vorspringt, daß das innere Ende der Laufradschaufel mit dem Außenmantel des Kragens einen engen Spalt bildet.The invention relates to a centrifugal pump with a single-bladed impeller whose the drive shaft averted central suction mouth with the inlet opening of the Pump chamber is aligned, the inlet opening a annular collar that forms in the impeller interior protrudes so that the inner end of the Impeller blade with the outer jacket of the collar forms a narrow gap.
In Abwässern, die mit Feststoffen beladen sind, werden häufig Freistrompumpen eingesetzt. Diese Freistrompumpen haben Wirkungsgradmaxima von ca. 50%, jedoch liegt der Wirkungsgrad im praktischen Anwendungsfall unter 40%. Diese niedrigen Wirkungsgrade haben eine Überdimensionierung des Antriebsmotors zur Folge. Da der Motor bei Tauchmotorpumpen rund 80% des Wertes einer Tauchmotorpumpe ausmacht, steigen die Investitionskosten, die benötigt werden, um eine bestimmte Flüssigkeitsmenge auf eine vorgegebene Höhe zu fördern. In wastewater loaded with solids frequently used free flow pumps. These free flow pumps have efficiency maxima of approx. 50%, however the Efficiency in practical use below 40%. These low efficiencies have one Oversizing of the drive motor results. Since the Motor in submersible pumps around 80% of the value of one Submersible pump, the investment costs increase, which are needed to get a certain amount of liquid to promote to a predetermined level.
Freistrompumpen haben weiterhin die Eigenart, daß sich Feststoffe in der Mitte des Laufrades anlagern und den freien Durchfluß verkleinern, so daß die Pumpe im gedrosselten Betrieb läuft. Die Pumpe selbst blockiert nicht, da das Laufrad mit seiner Stirnseite weit von der Wandung des Pumpengehäuses entfernt ist.Free flow pumps continue to have the peculiarity that Store solids in the middle of the impeller and Reduce free flow so that the pump in throttled operation is running. The pump itself is blocked not because the impeller with its end face far from the Wall of the pump housing is removed.
Laufräder mit besserem Wirkungsgrad sind Einkanallaufräder, die nur eine einzige Schaufel besitzen. Diese Laufräder erreichen Wirkungsgrade von über 70%, wenn sie räumlich gekrümmt sind. Diese räumliche Krümmung hat zur Folge, daß die Laufräder nicht abgedreht werden können, um andere Betriebspunkte zu erreichen. Daher benötigt man für jede Kennlinie ein separates Laufrad und ein eigenes Modell in der Gießerei. Zylindrische Laufräder sind abdrehbar und haben einen etwas geringeren Wirkungsgrad, als die räumlich gekrümmten.Impellers with better efficiency are Single channel impellers that are only a single blade have. These impellers achieve efficiencies of over 70% if they are spatially curved. This spatial curvature means that the impellers are not can be turned off to other operating points to reach. Therefore one needs for each characteristic separate impeller and its own model in the foundry. Cylindrical impellers can be turned and have one somewhat lower efficiency than that spatially curved.
Aus US 1718396 ist eine zweiflügelige Zentrifugalpumpe mit einem mittigen Saugmund bekannt, deren Einlaßöffnung einen nach innen gerichteten ringförmigen Kragen bildet. Auch wenn durch den ringförmigen Kragen gewährleistet ist, daß das grob verschmutzte Abwasser vergleichsweise sich in den Saugmund gelangt, so kann es dennoch vorkommen, daß großfaserige Verunreinigungen vom Laufrad ergriffen und im Spalt eingeklemmt werden. Dabei dreht sich die Verunreinigung endlos mit und kann nicht durch das Laufrad abgeschert werden, so daß es zu einer dauerhaften Blockierung des Laufrades kommt.From US 1718396 is a two-bladed centrifugal pump known with a central suction mouth, the inlet opening forms an inward annular collar. Even if guaranteed by the annular collar is that the grossly polluted wastewater is comparatively gets into the suction mouth, it can still occur that large-fiber impurities from the impeller be gripped and pinched in the gap. It turns the pollution is endless and cannot pass through the impeller is sheared off so that it becomes a permanent blocking of the impeller comes.
Aufgabe der Erfindung ist es, eine Kreiselpumpe der eingangs genannten Art so zu verbessern, daß sie bei einfacher Konstruktion und Herstellung in hohem Maße verstopfungsfrei ist und sich von einmal durch das Laufrad ergriffenen Feststoffen selbstätig befreit.The object of the invention is to provide a centrifugal pump type mentioned so that they improve simple design and manufacture to a high degree is free from constipation, Solids seized from the impeller automatically.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß an der Außenseite des Kragens ein koaxialer Zahnkranz angrenzt, dessen Zähne etwa radial ausgerichtet sind.This object is achieved in that a coaxial ring gear on the outside of the collar adjacent, whose teeth are aligned approximately radially.
Eine solche Pumpe verstopft insbesondere nicht durch Feststoffe im Fördermedium, die als "Pumpenschreck" bezeichnet werden, wie beispielsweise Plastiktüten und Strumpfhosen. Die Pumpe ist damit besonders tauglich für Abwässer verschiedener Art. Darüberhinaus ist das zylindrische Laufrad der erfindungsgemäßen Pumpe abdrehbar.Such a pump in particular does not become blocked Solids in the pumped medium that act as "pump shock" are referred to, such as plastic bags and Tights. The pump is therefore particularly suitable for Waste water of various types. Furthermore, that is cylindrical impeller of the pump according to the invention turnable.
Besonders vorteilhaft ist es, wenn in der Pumpenkammerseitenwand, die den Einlaß aufweist eine Bodenplatte gelagert ist, die den Kragen direkt oder durch einen Einsatz bildet und wenn an der Außenseite des Kragens auf der Bodenplatte ein koaxialer Zahnkranz angrenzt, dessen Zähne etwa radial ausgerichtet sind. Diese radialen Zähne bewirken, daß der Feststoff nicht mit dem Laufrad endlos herumgedreht, sondern zurückgehalten wird, so daß die nach außen drehende Spirale ihre volle Wirkung entfalten kann. Auch werden hierdurch Feststoffe, die sich um die Vorderkante des Laufrades geschlungen haben, von den Zähnen zurückgehalten und auch der Wirkung der Spirale ausgesetzt. Schließlich kann.bei bestimmten Feststoffen von den Zähnen eine zerkleinernde Wirkung auf die Feststoffe ausgeübt werden.It is particularly advantageous if, in the pump chamber side wall, which has the inlet a base plate is stored directly or through a collar Use forms and when on the outside of the Collar on the base plate is a coaxial ring gear adjacent, whose teeth are aligned approximately radially. These radial teeth cause the solid to fail endlessly spun around with the impeller, but is held back so that the outward rotating Spiral can develop its full effect. Be too this will cause solids to build up around the leading edge of the Impeller have slung from your teeth restrained and also the effect of the spiral exposed. Finally, with certain solids from the teeth a crushing effect on the Solids are exercised.
Hierbei wird vorzugsweise vorgeschlagen, daß der den Kragen bildende Einsatz buchsenförmig zumindest den Bereich des Einlasses auskleidet, der dem Laufrad zugewandt ist.It is preferably proposed that the Collar-forming insert at least in the form of a sleeve Area of the inlet that lines the impeller is facing.
Vorzugsweise wird vorgeschlagen, daß der dem Laufrad zugewandte Boden der Kammerseitenwand, insbesondere durch eine Bodenplatte, eine spiralförmige Nut um den Einlaß herum bildet, durch die zwischen Laufrad und Kammerseitenwand eindringende Feststoffe nach außen bewegbar sind. Durch eine solche Spirale werden Feststoffe, die sich zwischen der Unterkante des Laufrades und der Kammerseitenwand hindurchzwängen durch die Spirale mitgenommen und radial nach außen bewegt, so daß das Laufrad sich selbsttätig von eingeklemmten Feststoffen befreit.It is preferably proposed that the impeller facing bottom of the chamber side wall, in particular by a bottom plate, a spiral groove around the inlet forms around by between the impeller and Chamber side wall penetrating solids to the outside are movable. Be through such a spiral Solids that are between the bottom edge of the Squeeze the impeller and the chamber side wall through the spiral taken along and moved radially outwards, so that the impeller automatically gets stuck Solids free.
Vorzugsweise wird vorgeschlagen, daß die der Bodenplatte zugewandte Stirnseite des inneren Endes der Laufradschaufel über dem Zahnkranz mit geringem Abstand liegt. Hierbei sollte an der Außenseite des Zahnkranzes die Spiralnut angrenzen.It is preferably proposed that the bottom plate facing end of the inner end of the Impeller blade above the ring gear with a small clearance lies. This should be on the outside of the ring gear border the spiral groove.
Auch wird hierbei vorzugsweise vorgeschlagen, daß die Breite der Zähne und damit des Zahnkranzes etwa gleich der Breite der Stirnseite des inneren Endes der Laufradschaufel ist, sowie das Laufradschaufelende mit einem Radius versehen ist, so daß die Faserstoffe viel einfacher eingezogen werden können.It is also preferably proposed that the Width of the teeth and thus the ring gear about the same the width of the face of the inner end of the Impeller blade is, as well as the impeller blade end with is provided with a radius so that the fibrous material much can be drawn in more easily.
Ausführungsbeispiele der Erfindung sind in den Zeichnungen dargestellt und werden im folgenden näher beschrieben. Es zeigen:
- Figur 1:
- Ein achsialer Schnitt durch eine Pumpenkammer.
- Figur 2:
- Eine Ansicht der Pumpenkammerseitenwand mit Zahnkranz und einem inneren kurzen Bereich der Spirale und
- Firgur 3:
- eine perspektivische Ansicht von Kragen, Zahnkranz, Spirale und innerem Ende der Laufradschaufel in einem Ausschnitt.
- Figure 1:
- An axial section through a pump chamber.
- Figure 2:
- A view of the pump chamber sidewall with ring gear and an inner short area of the spiral and
- Firgur 3:
- a perspective view of the collar, ring gear, spiral and inner end of the impeller blade in a cutout.
Eine Kreiselpumpe weist ein Pumpengehäuse 1 auf, das eine
Pumpenkammer 2 bildet, in dem ein Laufrad 3 gelagert ist.
Das Laufrad 3 wird über eine Welle 4 von einem nicht
dargestellten Elektromotor angetrieben.A centrifugal pump has a pump housing 1, the one
Auf der der Welle 4 und dem Elektromotor abgewandten
Seite ist die Kammer 2 durch eine Pumpenkammerseitenwand
5 verschlossen, die rechtwinklig zur Achse der Welle 4
liegt und einen Pumpeneinlaß 6 bildet, der koaxial zur
Welle 4 liegt und damit mit dem Saugmund des Laufrades 3
fluchtet.On the side facing away from the shaft 4 and the electric motor
Side is
Das zylindrische und damit abdrehbare Laufrad 3 weist nur
eine einzige gekrümmte Schaufel 7 auf, deren Inneres,
d.h. der Laufradachse 8 näheres Ende 7a in nächster Nähe
des Randes des Einlasses 6 umläuft. Hierbei bildet der
innere Rand des Einlasses 6 einen ringförmigen Kragen 9,
der einige Millimeter in das Laufrad 3 und damit in den
Saugmund des Laufrades 3 hineinreicht, so daß der Kragen
9 das innere Ende 7a um einige Millimeter überragt.
Vorzugsweise überdeckt hierbei der Kragen 9 das innere
Ende 7a um 2 bis 5, vorzugsweise um 2,5-3 Millimeter.The cylindrical and thus
Zwischen der Außenseite des Kragens 9 und der Innenwand
des inneren Endes 7a der Laufradschaufel besteht ein
Spalt 10 von nur etwa einem Bruchteil eines Millimeters,
wobei die Breite S des Spaltes mit zunehmender Leistung
wächst.Between the outside of the
Der Kragen 9 kann von der Pumpenkammerseitenwand 5 direkt
gebildet sein oder aber von einer Bodenplatte
11 oder einem in der Bodenplatte 11 befestigten Einsatz
12 (Figur 1). Hierbei kann der Einsatz 12 buchsenförmig
den Einlaß 6 auskleiden.The
Wie Figur 1 zeigt, ist der Einsatz 6 an der Innenseite
der Pumpenkammerseitenwand 5 von einer spiralförmigen Nut
13 umgeben, die bezüglich der kreisenden Flüssigkeit eine
solche Spiralrichtung A hat, daß zwischen der
Laufradschaufel und Kammerseitenwand eindringende
Feststoffe radial nach außen getrieben werden, wie dies
die mit Pfeilen versehene, gestrichelte Flußrichtung 14
in Figur 3 zeigt.As FIG. 1 shows, the
Wie die Figuren zeigen befindet
sich zwischen dem Kragen 9 und der spiralförmigen Nut 13
ein koaxial angeordneter Zahnkranz 15, über dem die
Stirnseite 16 des inneren Endes der Laufradschaufel in
geringem Abstand liegt, wobei die Breite b des
Zahnkranzes etwa gleich der Breite B der Stirnseite 16
ist. Hierbei liegen die Zähne des Zahnkranzes 15 etwa
radial zur Laufradachse 8, d.h. die (geraden)
Zahnflankenlinien der Zähne sind etwa radial angeordnet.As the figures show
between the
Besonders vorteilhaft ist es, wenn die Laufradschaufelvorderseite
am unteren stirnseitigen Ende einen Radius
erhält, der bewirkt, daß die Faserstoffe durch die
Laufradschaufel eingezogen und gezwungen werden, sich
durch die Bodenplattengestaltung nach außen zu bewegen.
Der Übergang von dem inneren Ende 7a zur Stirnseite 16
ist also abgerundet, wobei die Abrundung den Radius R
aufweist.It is particularly advantageous if the impeller blade front side
a radius at the lower end
receives, which causes the fibrous materials through the
Impeller blade is retracted and forced to move
to move outwards through the base plate design.
The transition from the inner end 7a to the
Claims (9)
- A centrifugal pump having a single-vane impeller (3) whose central suction mouth remote from the driving shaft (4) is aligned with the inlet opening (6) of the pump chamber (2), the inlet opening (6) forming an annular collar (9) which so projects into the interior of the impeller that the inner end (7a) of the impeller vane (7) cooperates with the outer generated surface of the collar (9) to form a narrow gap (width S) characterized in that adjoining the outside of the collar (9) is a coaxial toothed rim (15) whose teeth are directed substantially radially.
- A centrifugal pump according to claim 1, characterized in that mounted in the pump chamber side wall (5) formed with the inlet (6) is an end plate (11) which forms the collar (9) directly or via an insert (12).
- A centrifugal pump according to claim 2, characterized in that the insert (12) forming the collar (9) lines after the fashion of a bush at least that zone of the inlet (6) which is adjacent the impeller (3).
- A centrifugal pump according to one of the preceding claims, characterized in that the end of the chamber side wall (5) adjacent the impeller (3) forms, more particularly via an end plate (11), around the inlet (6) a spiral-shaped groove (13) through which solids entering between the impeller (3) and the chamber side wall (5) can be moved outwards.
- A centrifugal pump according to one of the preceding claims, characterized in that the coaxial toothed rim (15) adjoins the outside of the collar on the end plate (11).
- A centrifugal pump according to claim 5, characterized in that the end face (16) of the inner end (7a) of the impeller vane (7) adjacent the end plate (11) lies at a small distance above the toothed rim (15).
- A centrifugal pump according to claims 5 or 6, characterized in that the spiral groove (13) adjoins the outside of the toothed rim (15).
- A centrifugal pump according to one of claims 5 to 7, characterized in that the width (b) of the teeth and therefore of the toothed rim (15) is substantially equal to the width (B) of the end face (16) of the inner end (7a) of the impeller vane (7).
- A centrifugal pump according to one of the preceding claims, characterized in that the end face lower end of the front side of the impeller vane has a rounding with a radius (R) through which fibrous substances are drawn in.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4338931A DE4338931C2 (en) | 1993-11-15 | 1993-11-15 | Non-clogging centrifugal pump |
DE4338931 | 1993-11-15 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0653564A1 EP0653564A1 (en) | 1995-05-17 |
EP0653564B1 true EP0653564B1 (en) | 1998-05-20 |
Family
ID=6502608
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP94103553A Expired - Lifetime EP0653564B1 (en) | 1993-11-15 | 1994-03-09 | Non-clogging centrifugal pump |
Country Status (4)
Country | Link |
---|---|
US (1) | US5516261A (en) |
EP (1) | EP0653564B1 (en) |
AT (1) | ATE166433T1 (en) |
DE (2) | DE4338931C2 (en) |
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US6921242B2 (en) * | 2001-07-10 | 2005-07-26 | Urs Blattmann | Centrifugal slurry pump |
DE20114891U1 (en) * | 2001-09-10 | 2001-11-15 | Grundfos A/S, Bjerringbro | Sewage centrifugal pump |
SE0302752L (en) | 2003-10-20 | 2005-02-15 | Itt Mfg Enterprises Inc | Centrifugal pump |
US7037069B2 (en) * | 2003-10-31 | 2006-05-02 | The Gorman-Rupp Co. | Impeller and wear plate |
SE0400964L (en) * | 2004-04-15 | 2005-10-11 | Pumpex Ab | channel Wheel |
SE527818C2 (en) * | 2005-06-17 | 2006-06-13 | Itt Mfg Enterprises Inc | Pump is for moving contaminated fluid including solid material and has pump housing, rotatable pump wheel with at least one blade and pump wheel seat containing at least one recess in its upper surface |
BRPI0816199A2 (en) * | 2007-09-04 | 2015-04-14 | Envirotech Pumpsystems Inc | Wear plate for a centrifugal pump |
DE102008016476A1 (en) * | 2008-03-31 | 2009-10-01 | BSH Bosch und Siemens Hausgeräte GmbH | Household appliance e.g. laundry dryer, has unchokable pump for conveying liquid medium that flows in appliance, where unchokable pump conveys condensate that comprises fibrous material and is produced during operation of appliance |
US8118244B2 (en) * | 2010-03-11 | 2012-02-21 | Vaughan Company, Inc. | Internal cutter on submersed mixer |
CN103154522A (en) | 2010-07-21 | 2013-06-12 | Itt制造企业有限责任公司 | Wear reduction device for rotary solids handling equipment |
WO2019071318A1 (en) * | 2017-10-12 | 2019-04-18 | Weir Minerals Australia Ltd | Inlet component for a slurry pump |
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DE6921357U (en) * | 1969-05-22 | 1969-10-09 | Hans Hoffmann Elmasch Bau Fa | SEWAGE PUMP |
FI49345C (en) * | 1972-05-15 | 1975-05-12 | Ahlstroem Oy | Device for preventing clogging of the sealing gap, especially in a sewage pump or the like. |
DE2344576A1 (en) * | 1973-09-04 | 1975-03-13 | Neratoom | Centrifugal pump for abrasive suspensions - has sealing gaps formed by cooperating faces of impeller and housing, thus giving minimized wear |
FI750217A (en) * | 1975-01-28 | 1976-07-30 | Sarlin Ab Oy E | |
DE2612910A1 (en) * | 1976-03-26 | 1977-09-29 | Albert Blum | SEWAGE 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 |
DE3015755A1 (en) * | 1980-04-24 | 1981-11-05 | Albert 5204 Lohmar Blum | Submersible vertical pump for sewage - has wedges on baseplate to allow easy adjustment of gap between baseplate and impeller |
SE466766B (en) * | 1989-04-27 | 1992-03-30 | Flygt Ab Itt | Centrifugal pump intended for pumping of liquids containing solid particles, for example, rags and other long-stretched objects |
-
1993
- 1993-11-15 DE DE4338931A patent/DE4338931C2/en not_active Expired - Fee Related
-
1994
- 1994-03-09 AT AT94103553T patent/ATE166433T1/en not_active IP Right Cessation
- 1994-03-09 EP EP94103553A patent/EP0653564B1/en not_active Expired - Lifetime
- 1994-03-09 DE DE59406012T patent/DE59406012D1/en not_active Expired - Lifetime
- 1994-06-10 US US08/258,241 patent/US5516261A/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
DE59406012D1 (en) | 1998-06-25 |
ATE166433T1 (en) | 1998-06-15 |
US5516261A (en) | 1996-05-14 |
EP0653564A1 (en) | 1995-05-17 |
DE4338931C2 (en) | 1996-09-05 |
DE4338931A1 (en) | 1995-05-18 |
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