EP0653564B1 - Non-clogging centrifugal pump - Google Patents

Non-clogging centrifugal pump Download PDF

Info

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
Application number
EP94103553A
Other languages
German (de)
French (fr)
Other versions
EP0653564A1 (en
Inventor
Manfred Zelder
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.)
Wilo SE
Original Assignee
Wilo GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Wilo GmbH filed Critical Wilo GmbH
Publication of EP0653564A1 publication Critical patent/EP0653564A1/en
Application granted granted Critical
Publication of EP0653564B1 publication Critical patent/EP0653564B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • 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.

Abstract

The invention relates to a centrifugal pump with a single-blade impeller (3), whose central suction mouth remote from the drive shaft (4) is in alignment with the inlet opening (6) of the pump chamber (2), the inlet opening forming an annular collar (9) which projects into the impeller interior in such a way that the inner end (7a) of the impeller blade (7) forms a narrow gap (width S) with the outer circumference of the collar (9). <IMAGE>

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.
Embodiments of the invention are shown in the drawings and are described in more detail below. Show it:
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 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.

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 chamber 2 through a pump chamber side wall 5 closed, which is perpendicular to the axis of the shaft 4 lies and forms a pump inlet 6 which is coaxial with Shaft 4 lies and thus with the suction mouth of the impeller 3 flees.

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 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. Here, 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.

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 collar 9 and the inner wall of the inner end 7a of the impeller blade Gap 10 of only about a fraction of a millimeter, the width S of the gap with increasing power grows.

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 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). Here, the insert 12 can be socket-shaped line inlet 6.

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 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.

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 collar 9 and the spiral groove 13 a coaxially arranged ring gear 15 over which the End face 16 of the inner end of the impeller blade in is a short distance, the width b of the Sprocket approximately equal to the width B of the end face 16 is. Here, 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.

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 end face 16 is therefore rounded off, the rounding off the radius R having.

Claims (9)

  1. 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.
  2. 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).
  3. 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).
  4. 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.
  5. 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).
  6. 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).
  7. A centrifugal pump according to claims 5 or 6, characterized in that the spiral groove (13) adjoins the outside of the toothed rim (15).
  8. 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).
  9. 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.
EP94103553A 1993-11-15 1994-03-09 Non-clogging centrifugal pump Expired - Lifetime EP0653564B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4338931 1993-11-15
DE4338931A DE4338931C2 (en) 1993-11-15 1993-11-15 Non-clogging centrifugal pump

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)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6921242B2 (en) * 2001-07-10 2005-07-26 Urs Blattmann Centrifugal slurry pump
DE20114891U1 (en) * 2001-09-10 2001-11-15 Grundfos As Sewage centrifugal pump
SE525412C2 (en) 2003-10-20 2005-02-15 Itt Mfg Enterprises Inc Centrifugal pump for contaminated liquids, comprises wheel with scoops and cover plates with spiral grooves around casing inlet
US7037069B2 (en) * 2003-10-31 2006-05-02 The Gorman-Rupp Co. Impeller and wear plate
SE526557C2 (en) * 2004-04-15 2005-10-11 Pumpex Ab channel Wheel
SE0501382L (en) * 2005-06-17 2006-06-13 Itt Mfg Enterprises Inc Pump for pumping contaminated liquid
AU2008296843B2 (en) * 2007-09-04 2011-08-18 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
BR112013001314A2 (en) 2010-07-21 2016-05-17 Itt Mfg Entpr Llc 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

Family Cites Families (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1990672U (en) * 1968-08-01 Blum, Albert, 5201 Scheiderhöhe/DE Dirty water pump
DE240859C (en) * 1911-04-14 1911-11-18 CENTRIFUGAL PUMP FOR CONVEYED LOAD WITH SOLID COMPONENTS
US1718396A (en) * 1924-01-12 1929-06-25 Raymond Guy Palmer Centrifugal pump
DE614426C (en) * 1933-09-21 1935-06-07 A D Sihl A G Vorm A Schmid Mas Centrifugal pump for contaminated fluids
US2245035A (en) * 1939-02-13 1941-06-10 American Well Works Centrifugal sludge pump
US2265758A (en) * 1940-05-29 1941-12-09 Buffalo Pumps Inc Pump
US3020850A (en) * 1958-02-27 1962-02-13 Meckum Engineering Inc Dredge pump seal
AT211773B (en) * 1958-07-15 1960-11-10 Tornado A G Electric vacuum cleaner
DE1137629B (en) * 1959-04-02 1962-10-04 Georg Volland Dr Ing Single-channel centrifugal pump, especially for pumping waste water
US3096718A (en) * 1961-12-12 1963-07-09 Conard Kenner Trash cutter for a pump
AT255912B (en) * 1964-07-01 1967-07-25 Schlesiger & Co Kg Feluwa Dirty water centrifugal pump
CH411584A (en) * 1964-07-10 1966-04-15 Kolb Eugen Ag Centrifugal pump for pumping contaminated liquids
US3447475A (en) * 1967-01-09 1969-06-03 Albert Blum Centrifugal pump
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

Also Published As

Publication number Publication date
DE4338931C2 (en) 1996-09-05
ATE166433T1 (en) 1998-06-15
EP0653564A1 (en) 1995-05-17
DE4338931A1 (en) 1995-05-18
DE59406012D1 (en) 1998-06-25
US5516261A (en) 1996-05-14

Similar Documents

Publication Publication Date Title
DE69620635T2 (en) PUMP WHEEL WITH SEPARATED, SLITTED RODS
EP0653564B1 (en) Non-clogging centrifugal pump
DE1453782A1 (en) centrifugal pump
DE4336090C2 (en) Unit for delivering fuel from a reservoir to the internal combustion engine of a motor vehicle
DE2313403A1 (en) AXIAL FLOW MACHINE
DE4209126C2 (en) Peripheral pump
AT402842B (en) DEVICE FOR PUMPING PUMP
DE4438841C2 (en) Pump with a cutting device
EP1213517B1 (en) Mechanical seal for fluid-flow machines
DE19615322A1 (en) Peripheral pump
DE2405655A1 (en) PITOT CENTRIFUGAL PUMP WITH SLOTTED INLET CHANNELS IN THE ROTOR HOUSING
EP1186782B1 (en) Submersible pump
DE4039712C2 (en) Peripheral pump
DE102015003224A1 (en) Self-priming pump
DE60217638T2 (en) The centrifugal pump impeller
WO1996024770A1 (en) Fluid pump
DE102008056106B4 (en) Side channel blower, in particular secondary air blower for an internal combustion engine
DE4239071C2 (en) Submersible pump unit
EP0017829B1 (en) Centrifugal pump and its housing
DE1528682B2 (en) CENTRIFUGAL PUMP KIT
DE1503523A1 (en) Improvements to fans
DE2442446A1 (en) Sewage pump for water containing solids - has impeller with blades attached to outer shroud and open centre
DE3211230A1 (en) centrifugal pump, especially for dirty water and effluent
AT203875B (en) Circulation pump for pumping liquids such as sewage, thick matter and the like. like
EP3608544B1 (en) Centrifugal pump

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT CH DE ES FR GB IT LI NL SE

17P Request for examination filed

Effective date: 19950701

17Q First examination report despatched

Effective date: 19961120

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT CH DE ES FR GB IT LI NL SE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: THE PATENT HAS BEEN ANNULLED BY A DECISION OF A NATIONAL AUTHORITY

Effective date: 19980520

REF Corresponds to:

Ref document number: 166433

Country of ref document: AT

Date of ref document: 19980615

Kind code of ref document: T

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

ET Fr: translation filed
GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)

Effective date: 19980520

REF Corresponds to:

Ref document number: 59406012

Country of ref document: DE

Date of ref document: 19980625

ITF It: translation for a ep patent filed

Owner name: SOCIETA' ITALIANA BREVETTI S.P.A.

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 19980820

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19990309

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19990331

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19990331

26N No opposition filed
REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 20050309

NLT1 Nl: modifications of names registered in virtue of documents presented to the patent office pursuant to art. 16 a, paragraph 1

Owner name: WILO AG

PGRI Patent reinstated in contracting state [announced from national office to epo]

Ref country code: IT

Effective date: 20080301

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 20090303

Year of fee payment: 16

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20090304

Year of fee payment: 16

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: IT

Payment date: 20100316

Year of fee payment: 17

REG Reference to a national code

Ref country code: NL

Ref legal event code: V1

Effective date: 20101001

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20100309

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20101001

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20100309

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20110309

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20120319

Year of fee payment: 19

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20120411

Year of fee payment: 19

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20131129

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 59406012

Country of ref document: DE

Effective date: 20131001

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20130402

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20131001