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EP0278388A2 - Centrifugal pump for contaminated liquids - Google Patents

Centrifugal pump for contaminated liquids Download PDF

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Publication number
EP0278388A2
EP0278388A2 EP88101578A EP88101578A EP0278388A2 EP 0278388 A2 EP0278388 A2 EP 0278388A2 EP 88101578 A EP88101578 A EP 88101578A EP 88101578 A EP88101578 A EP 88101578A EP 0278388 A2 EP0278388 A2 EP 0278388A2
Authority
EP
European Patent Office
Prior art keywords
centrifugal pump
openings
teeth
comminution device
cutting
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
EP88101578A
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German (de)
French (fr)
Other versions
EP0278388B1 (en
EP0278388A3 (en
Inventor
Peter Rupprecht
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
Klein Schanzlin and Becker AG
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Filing date
Publication date
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Application filed by KSB AG, Klein Schanzlin and Becker AG filed Critical KSB AG
Publication of EP0278388A2 publication Critical patent/EP0278388A2/en
Publication of EP0278388A3 publication Critical patent/EP0278388A3/en
Application granted granted Critical
Publication of EP0278388B1 publication Critical patent/EP0278388B1/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
    • 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
    • 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
    • F04D29/2261—Rotors specially for centrifugal pumps with special measures
    • F04D29/2288—Rotors specially for centrifugal pumps with special measures for comminuting, mixing or separating

Definitions

  • the invention relates to a centrifugal pump according to the preamble of the claim.
  • Such a centrifugal pump is known from CH-PS 423 489.
  • This centrifugal pump has a cutting ring which is arranged in front of the inlet opening of the impeller and which cooperates with a cutting piece which is resiliently pressed against it.
  • the cutting ring can be designed as a flat, conical or also as a cylindrical part. With a cylindrical design of the cutting ring, the cutting piece can be arranged on the inside or the outside of the cylinder.
  • the function of the cutting piece is common to all versions: solids from the suction of the centrifugal pump against the openings of the cutting ring are led to the cutting piece and, in the best case, shredded there.
  • the solid part is so solid or so large that it cannot be crushed in a first cutting process, it is fed to the cutting piece as often and until it is reduced to a dimension that falls below the opening size of the cutting ring.
  • it is flexibly suspended. It is lifted out of its normal position by all admixtures that cannot be crushed in the first pass. This can lead to larger lobes covering the cutting ring and in an extreme case za fearful closure of all openings clog the inlet to the centrifugal pump.
  • Comminution devices are also already known which act as cutting and grinding mechanisms upstream of the impeller of the centrifugal pump.
  • DE-OS 26 12 910 may serve as an example for a large number of such devices. All these facilities have in common the fact that they restrict the suction mouth of the impeller. Their operation requires high torques and therefore powerful drive motors in order to choke the shredded material through the device.
  • the crushing devices which act as cutting and grinding mechanisms, tend to form braids from the solid admixtures of the conveyed liquid, which in turn can lead to a blockage of the flow.
  • the invention has for its object to provide a centrifugal pump with a shredding device, which achieves a safe cutting and conveying effect for the fixed component of the conveyed material with little effort for the parts used and a comparatively small drive power.
  • the parts to be used for the subject matter of the invention are simple to manufacture and can also be installed in many existing centrifugal pumps.
  • the shredding device according to the invention does not restrict the suction mouth. It performs a real cutting process, the cut goods can be immediately removed via the impeller.
  • the impeller (1) in the centrifugal pump is attached to a shaft (2).
  • the shaft (2) also carries the rotating part (4) of a cutting device fastened with a screw (3).
  • Radial openings (5) are arranged in the peripheral part (4).
  • the peripheral part (4) is enclosed by a ring (7) fastened to the suction-side housing wall (6) and provided with several teeth (8).
  • the teeth (8) are located in the area covered by the openings (5) of the peripheral part (4).
  • an object in the delivery liquid for example a rag
  • the suction of the laurade (1) When the centrifugal pump is running, an object in the delivery liquid, for example a rag, is attracted by the suction of the laurade (1) and thus reaches the area of the cutting device formed by the ring (7) and the peripheral part (4).
  • the object is first held by the ring (7) and broken down into small pieces which can be conveyed by the impeller (1) through the cooperating edges of the openings (5) and the teeth (8). This takes place in that the parts of the solid that enter the openings (5) are gripped and separated with a pulling cut.
  • the openings (5) can also be oval, diamond-shaped or slit-shaped.
  • the shape of the teeth (8) of the ring (7) can also be designed differently than in the exemplary embodiment. Chilled cast iron, sintered metal or hardened tool steel can be used as the material for the cutting device.

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

Abstract

Die Erfindung betrifft eine Kreiselpumpe mit einer dem Pumpenlaufrad vorgeschalteten Zerkleinerungseinrichtung für Beimengungen in der Förderflüssigkeit.The invention relates to a centrifugal pump with a comminution device upstream of the pump impeller for admixtures in the delivery liquid.

Die beim Erfindungsgegenstand verwendete Zerkleinerungs­einrichtung besteht aus wenigen, leicht herstellbaren Teilen: Einem mit Öffnungen (5) versehenen umlaufenden Teil (4) und einem dieses umschließenden Ring (7), der mit einer Mehrzahl von Zähnen (8) versehen ist, welche sich in dem von den Öffnungen (5) bestrichenen Bereich befinden, wobei die Größe der Öffnungen (5) und der freien Räume zwischen den Zähnen (8) so bemessen ist, daß der freie Querschnitt der Zerkleinerungseinrichtung in allen Stellungen des umlaufenden Teiles (4) mindestens dem geforderten Einlaufquerschnitt der Kreiselpumpe entspricht (Fig. 1).

Figure imgaf001
The comminution device used in the subject matter of the invention consists of a few, easily producible parts: a circumferential part (4) provided with openings (5) and a ring (7) enclosing this, which is provided with a plurality of teeth (8) which are in the of the openings (5) covered area, the size of the openings (5) and the free spaces between the teeth (8) is such that the free cross section of the shredding device in all positions of the rotating part (4) at least the required Inlet cross-section corresponds to the centrifugal pump (Fig. 1).
Figure imgaf001

Description

Gegenstand der Erfindung ist eine Kreiselpumpe gemäß dem Gattungsbegriff des Patentanspruches.The invention relates to a centrifugal pump according to the preamble of the claim.

Eine derartige Kreiselpumpe ist bekannt durch die CH-PS 423 489. Diese Kreiselpumpe besitzt einen vor der Zulauföffnung des Laufrades angeordneten Schneidring, welcher mit einem federnd gegen ihn angepreßten Schneidstück zusammenwirkt. Gemäß der Lehre der zitierten Schrift kann der Schneidring als ebenes, kegeliges oder auch als zylindrisches Teil ausgebildet sein. Bei zylindrischer Gestaltung des Schneidringes kann das Schneidstück an der Innen- oder der Außenseite des Zylinders angeordnet sein. Allen Ausführungen gemeinsam ist die Funktion des Schneidstückes: Vom Sog der Kreiselpumpe gegen die Öffnungen des Schneidringes angelegte Feststoffe werden zu dem Schneid­stück geführt und dort im günstigen Falle zerkleinert. Ist das Feststoffteil jedoch so fest oder so groß, daß es nicht in einem ersten Schneidvorgang zerkleinert werden kann, wird es dem Schneidstück so oft und so lange zugeführt, bis es auf ein die Öffnungsgröße des Schneidringes unterschreitendes Maß reduziert ist. Um das Schneidstück vor Beschädigungen durch feste Stoffe zu schützen, ist es beweglich aufgehängt. So wird es durch alle Beimengungen, die nicht im ersten Durchgang zerkleinert werden können, aus seiner normalen Position herausgehoben. Dies kann dazu führen, daß größere Lappen den Schneidring überdecken und durch einen im Extremfall za befürchtenden Verschluß sämtlicher Öffnungen den Zulauf zur Kreiselpumpe verstopfen.Such a centrifugal pump is known from CH-PS 423 489. This centrifugal pump has a cutting ring which is arranged in front of the inlet opening of the impeller and which cooperates with a cutting piece which is resiliently pressed against it. According to the teaching of the cited document, the cutting ring can be designed as a flat, conical or also as a cylindrical part. With a cylindrical design of the cutting ring, the cutting piece can be arranged on the inside or the outside of the cylinder. The function of the cutting piece is common to all versions: solids from the suction of the centrifugal pump against the openings of the cutting ring are led to the cutting piece and, in the best case, shredded there. However, if the solid part is so solid or so large that it cannot be crushed in a first cutting process, it is fed to the cutting piece as often and until it is reduced to a dimension that falls below the opening size of the cutting ring. In order to protect the cutting piece from damage by solid materials, it is flexibly suspended. It is lifted out of its normal position by all admixtures that cannot be crushed in the first pass. This can lead to larger lobes covering the cutting ring and in an extreme case za fearful closure of all openings clog the inlet to the centrifugal pump.

Es sind auch bereits Zerkleinerungseinrichtungen bekannt, die als dem Laufrad der Kreiselpumpe vorgeschaltete Schneid- und Mahlwerke wirken. Die DE-OS 26 12 910 mag hier als Beispiel für eine Vielzahl solcher Einrichtungen dienen. All diesen Einrichtungen gemeinsam ist der Umstand, daß sie den Saugmund des Laufrades einengen. Ihr Betrieb verlangt hohe Drehmomente und damit starke Antriebsmotoren, um das zerkleinerte Gut durch die Einrichtung zu würgen. Im übrigen hat sich in der Praxis erwiesen, daß die als Schneid- und Mahlwerke wirkenden Zerkleinerungseinrichtungen dazu neigen, Zöpfe aus den festen Beimengungen der Förderflüssigkeit zu bilden, was wiederum zu einer Verstopfung des Durchflusses führen kann.Comminution devices are also already known which act as cutting and grinding mechanisms upstream of the impeller of the centrifugal pump. DE-OS 26 12 910 may serve as an example for a large number of such devices. All these facilities have in common the fact that they restrict the suction mouth of the impeller. Their operation requires high torques and therefore powerful drive motors in order to choke the shredded material through the device. In addition, it has been found in practice that the crushing devices, which act as cutting and grinding mechanisms, tend to form braids from the solid admixtures of the conveyed liquid, which in turn can lead to a blockage of the flow.

Der Erfindung liegt die Aufgabe zugrunde, eine Kreiselpumpe mit einer Zerkleinerungseinrichtung zu schaffen, die bei einem geringen Aufwand für die verwendeten Teile und einer vergleichs­weise kleinen Antriebsleistung eine sichere Schneid- und Förderwirkung für die festen Bestandteils des Fördergutes erreicht.The invention has for its object to provide a centrifugal pump with a shredding device, which achieves a safe cutting and conveying effect for the fixed component of the conveyed material with little effort for the parts used and a comparatively small drive power.

Die gestellte Aufgabe wird bei einer dem Gattungsbegriff entsprechenden Kreiselpumpe gelöst durch die im kennzeichnenden Teil des Patentanspruches genannten Merkmale.The object is achieved in a centrifugal pump corresponding to the generic term by the features mentioned in the characterizing part of the claim.

Die für den Erfindungsgegenstand zu verwendenden Teile sind einfach herzustellen und können auch in viele bereits bestehende Kreiselpumpen eingebaut werden. Die erfindungsgemäße Zerkleinerungseinrichtung engt den Saugmund nicht ein. Sie vollzieht einen echten Schneidvorgang, das abgeschnittene Gut kann sofort über das Laufrad abtransportiert werden.The parts to be used for the subject matter of the invention are simple to manufacture and can also be installed in many existing centrifugal pumps. The shredding device according to the invention does not restrict the suction mouth. It performs a real cutting process, the cut goods can be immediately removed via the impeller.

Anhand eines Ausführungsbeispiels wird die Erfindung näher erläutert. Die Zeichnung zeigt in

  • Fig. 1 eine Schnittdarstellung durch eine erfindungsgemäße Kreiselpumpe im Bereich des Laufrades und der Zerkleinerungseinrichtung, und in
  • Fig. 2 eine Seitenansicht der als Einzelheit dargestellten Zerkleinerungseinrichtung.
The invention is explained in more detail using an exemplary embodiment. The drawing shows in
  • Fig. 1 is a sectional view through a centrifugal pump according to the invention in the region of the impeller and the shredding device, and in
  • Fig. 2 is a side view of the shredding device shown as a detail.

Das Laufrad (1) in der Kreiselpumpe ist auf einer Welle (2) befestigt. Die Welle (2) trägt außerdem das mit einer Schraube (3) befestigte umlaufende Teil (4) einer Schneideinrichtung. Im umlaufenden Teil (4) sind radiale Öffnungen (5) angeordnet.The impeller (1) in the centrifugal pump is attached to a shaft (2). The shaft (2) also carries the rotating part (4) of a cutting device fastened with a screw (3). Radial openings (5) are arranged in the peripheral part (4).

Das umlaufende Teil (4) wird umschlossen von einem an der saugseitigen Gehäusewand (6) befestigten Ring (7), der mit mehreren Zähnen (8) versehen ist. Die Zähne (8) befinden sich in dem von den Öffnungen (5) des umlaufenden Teiles (4) bestrichenen Bereich.The peripheral part (4) is enclosed by a ring (7) fastened to the suction-side housing wall (6) and provided with several teeth (8). The teeth (8) are located in the area covered by the openings (5) of the peripheral part (4).

Bei laufender Kreiselpumpe wird ein in der Förderflüssigkeit befindlicher Gegenstand, beispielsweise ein Lappen, vom Sog des Laurades (1) angezogen und gelangt somit in den Bereich des durch den Ring (7) und das umlaufende Teil (4) gebildeten Schneideinrichtung. Hier wird der Gegenstand zunächst von dem Ring (7) gehalten und durch die zusammenwirkenden Kanten der Öffnungen (5) und der Zähne (8) in kleine, vom Laufrad (1) förderbare Stücke zerlegt. Diese geschieht dadurch, daß die in die Öffnungen (5) gelangenden Teile des Feststoffes erfaßt und mit ziehendem Schnitt abgetrennt werden.When the centrifugal pump is running, an object in the delivery liquid, for example a rag, is attracted by the suction of the laurade (1) and thus reaches the area of the cutting device formed by the ring (7) and the peripheral part (4). Here the object is first held by the ring (7) and broken down into small pieces which can be conveyed by the impeller (1) through the cooperating edges of the openings (5) and the teeth (8). This takes place in that the parts of the solid that enter the openings (5) are gripped and separated with a pulling cut.

Die Öffnungen (5) können, anders als im Ausführungsbeispiel, auch oval, rauten- oder schlitzförmig sein. Auch die Form der Zähne (8) des Ringes (7) kann anders gestaltet sein als im Ausführungsbeispiel. Als Material für die Schneideinrichtung können Hartguß, Sintermetall oder gehärteter Werkzeugstahl verwendet werden.Unlike in the exemplary embodiment, the openings (5) can also be oval, diamond-shaped or slit-shaped. The shape of the teeth (8) of the ring (7) can also be designed differently than in the exemplary embodiment. Chilled cast iron, sintered metal or hardened tool steel can be used as the material for the cutting device.

Claims (1)

Kreiselpumpe mit einer dem Pumpenlaufrad vorgeschalteten Zerkleinerungseinrichtung für faserige oder stückige Beimengungen in der Förderflüssigkeit, wobei die Zerkleinerungseinrichtung durch ein mit radialen Durch­trittsöffnungen versehenes umlaufendes Teil und ein damit zusammenwirkendes feststehendes Teil gebildet wird, dadurch gekennzeichnet, daß das feststehende Teil von einem das umlaufende Teil (4) umschließenden Ring (7) gebildet wird, der mit einer Mehrzahl von Zähnen (8) versehen ist, welche sich in dem von den Öffnungen (5) des umlaufenden Teiles (4) bestrichenen Bereich befinden, wobei die Größe der Öffnungen (5) und der freien Räume zwischen den Zähnen (8) so bemessen ist, daß der freie Querschnitt der Zerkleinerungseinrichtung in allen Stellungen des umlaufenden Teiles (4) mindestens dem geforderten Einlaufquerschnitt der Kreiselpumpe entspricht.Centrifugal pump with a comminution device upstream of the pump impeller for fibrous or lumpy admixtures in the conveying liquid, the comminution device being formed by a circumferential part provided with radial passage openings and a stationary part interacting therewith, characterized in that the stationary part is one of the circumferential part (4 ) surrounding ring (7) is formed, which is provided with a plurality of teeth (8), which are located in the area covered by the openings (5) of the peripheral part (4), the size of the openings (5) and the free spaces between the teeth (8) is dimensioned such that the free cross section of the comminution device in all positions of the rotating part (4) corresponds at least to the required inlet cross section of the centrifugal pump.
EP88101578A 1987-02-06 1988-02-04 Centrifugal pump for contaminated liquids Expired - Lifetime EP0278388B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873703647 DE3703647A1 (en) 1987-02-06 1987-02-06 CENTRIFUGAL PUMP FOR POLLUTED LIQUIDS
DE3703647 1987-02-06

Publications (3)

Publication Number Publication Date
EP0278388A2 true EP0278388A2 (en) 1988-08-17
EP0278388A3 EP0278388A3 (en) 1988-09-14
EP0278388B1 EP0278388B1 (en) 1991-10-16

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ID=6320396

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88101578A Expired - Lifetime EP0278388B1 (en) 1987-02-06 1988-02-04 Centrifugal pump for contaminated liquids

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EP (1) EP0278388B1 (en)
DE (1) DE3703647A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997047889A1 (en) * 1996-06-11 1997-12-18 Sweepax International Limited Rotodynamic pump

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4128281A1 (en) * 1991-08-27 1993-03-04 Abs Pumpen Ag Pump for handling domestic sewage - has disc with cutting blades arranged in front of pump inlet
DE4438841C2 (en) * 1994-11-02 1999-05-27 Orpu Gmbh Pump with a cutting device
ATE268436T1 (en) * 2002-03-14 2004-06-15 Ksb Ag CENTRIFUGAL PUMP WITH SHREDDING DEVICE
DE102008057233A1 (en) 2008-11-10 2010-05-12 Orpu Pumpenfabrik Gmbh Milling device for use in pump to e.g. mill thick matter available in sewage water, has cutting devices formed spatially separate from another cutting device such that rotation symmetric cutting parts enclose stationary cutting part
DE102011018434B4 (en) * 2011-04-16 2022-05-25 Wilo Se Centrifugal pump with cutter
DE102016225921A1 (en) 2016-12-21 2018-06-21 KSB SE & Co. KGaA Sewage lifting plant with cutting unit
DE102016225920A1 (en) 2016-12-21 2018-06-21 KSB SE & Co. KGaA Centrifugal pump with a crushing arrangement

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1528853A1 (en) * 1962-10-12 1969-12-04 Schade Geb Feissel Hertha Centrifugal pump for contaminated fluids with crushing device
DE1453750A1 (en) * 1964-05-29 1969-03-06 Josef Eisele Cutting unit in the suction line of a manure pump
DE2411043A1 (en) * 1974-03-08 1975-09-18 Abs Pumps Ltd Submerged sewage pump with disintegrator - exerts disintegrating forces in radial direction by radial rounded teeth on discs
DE2518179A1 (en) * 1975-04-24 1976-11-04 Bbc Brown Boveri & Cie Solids size-reducing unit for pump intake - has perforated disc with upstream rotary cutter arm at intake end of suction duct
DE2612910A1 (en) * 1976-03-26 1977-09-29 Albert Blum SEWAGE PUMP
DE2553823C2 (en) * 1975-11-29 1984-06-14 Albert 5204 Lohmar Blum Sewage pump
GB1568388A (en) * 1975-11-29 1980-05-29 Blum A Pump with comminuating means at the inlet
US4143990A (en) * 1977-04-29 1979-03-13 Atencio Francisco J G Dam with movable hydroelectric assembly
DE3340295A1 (en) * 1983-11-08 1985-05-15 Albert 5204 Lohmar Blum Pump for the delivery of liquids intermingled with lumpy contaminants

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997047889A1 (en) * 1996-06-11 1997-12-18 Sweepax International Limited Rotodynamic pump
US6241470B1 (en) 1996-06-11 2001-06-05 Sweepax International Limited Rotodynamic pump
US6447245B1 (en) 1996-06-11 2002-09-10 Sweepax International Limited Rotodynamic pump

Also Published As

Publication number Publication date
EP0278388B1 (en) 1991-10-16
DE3703647A1 (en) 1988-08-18
DE3703647C2 (en) 1992-05-27
EP0278388A3 (en) 1988-09-14

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