EP1840379B1 - Rotary pump with free flow wheel - Google Patents

Rotary pump with free flow wheel Download PDF

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Publication number
EP1840379B1
EP1840379B1 EP07005864A EP07005864A EP1840379B1 EP 1840379 B1 EP1840379 B1 EP 1840379B1 EP 07005864 A EP07005864 A EP 07005864A EP 07005864 A EP07005864 A EP 07005864A EP 1840379 B1 EP1840379 B1 EP 1840379B1
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EP
European Patent Office
Prior art keywords
flow
suction
centrifugal pump
influencing means
pump according
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EP07005864A
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German (de)
French (fr)
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EP1840379A2 (en
EP1840379A3 (en
Inventor
Rolf Witzel
Christoph Jäger
Peter Szlama
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KSB AG
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KSB AG
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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
    • 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
    • F04D29/44—Fluid-guiding means, e.g. diffusers
    • F04D29/445—Fluid-guiding means, e.g. diffusers especially 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2250/00—Geometry
    • F05D2250/50—Inlet or outlet
    • F05D2250/51—Inlet
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2260/00—Function
    • F05D2260/60—Fluid transfer
    • F05D2260/604—Vortex non-clogging type pumps

Definitions

  • the invention relates to a centrifugal pump with a rotating in a housing arranged freewheel impeller, wherein between a suction opening provided with a suction housing wall and the free-flow impeller a free passage of solidsmonder and is arranged in front of the freewheel impeller continuously extending blade-less space and the centrifugal pump with a device is provided to avoid the tearing of the flow
  • Centrifugal pumps with a free-flow impeller serve primarily to convey liquids containing solids. They have a shovel-free space between a suction-side housing wall and the impeller blades to allow the passage of solids through the housing without interference.
  • a centrifugal pump with a vertical arrangement of the impeller rotation axis is known. On the bladed side of the impeller and near the axis of rotation here is a single pin is arranged. It prevents agglomeration of larger amounts of non-promoted, contained in the pumped liquid solid components and thus a tearing of the flow. Such components are detected in the impeller inlet area of the pen and get into the flow.
  • a centrifugal pump is only partially usable in gas permeated conveying liquids, as they often represent wastewater. During operation of a centrifugal pump with a free-flow impeller, solids and gaseous effluents cause unwanted gas accumulation inside the centrifugal pump. If such gas bubbles are too large, this leads to a tearing of the flow.
  • the CH-A-418835 discloses a centrifugal pump designed according to the principle of a hydraulic coupling for the drainage of boreholes.
  • the impeller driven by an underwater pump motor has a pump impeller shape also used in a hydraulic clutch.
  • a toroidal suction-side housing wall is arranged at a distance in front of the impeller. This is smaller in diameter than the impeller outer diameter.
  • an annular inlet opening for a spiral space which develops in the axial direction of the centrifugal pump.
  • By its - in contrast to the usual solutions - axially forward and radially inward held spiral development of the outer diameter of the pump housing is kept small, so they can use within wells can.
  • the DE-U-7622070 describes a self-cleaning washing machine pump with a front of the pump filter system.
  • a cylindrical pump housing includes a pump chamber and a filter chamber separated by a partition having an opening.
  • a mushroom-shaped disk for forming a filter gap is arranged in front of the suction opening.
  • the decisive for the delivery characteristics of the pump flow space in front of the impeller is designed analogous to a conventional free-flow pump.
  • a passage of solids of defined size is allowed, but must be smaller than the suction and pressure port of the pump.
  • the US-A-4 076 179 discloses a sewage pump with a mounted on a suction-side housing wall, provided with a cutting blade insert. This is to shred fibrous solids, which causes a narrow gap between impeller blades and insert.
  • the invention has for its object to ensure at centrifugal pumps with free-flow impeller safe delivery of solid and gas-containing delivery liquids and to avoid tearing the flow.
  • the solution to this problem provides that opposite to the impeller blades and on the suction-side housing wall at least one axially projecting, one-piece or multi-part, flow-influencing means localizing the paddle-free space is arranged on one or more of the suction opening outgoing radial jets.
  • the in contrast to the rotating impeller flow-influencing means on the suction-side housing inner wall forces the pumped liquid in the blade-less space between the suction-side housing inner wall and the impeller blades on a approaching the impeller flow path. By forced local approach to the impeller, this swirls a possible accumulation of gases in rooms of low pressure and prevents the formation of unwanted gas accumulations. Even small gas bubbles are brought by the flow-influencing means on the suction-side housing wall in the effective range of the impeller blades and conveyed away. A tearing off of the flow is thereby reliably prevented.
  • the flow-influencing means is a radially extending and axially projecting rib.
  • the radial extent of such a rib may be equal to, smaller or larger than the extent of the impeller blades.
  • a tubular suction nozzle protrudes into the blade-less space that the flow-influencing means sealingly abuts the suction nozzle and / or on the suction-side housing wall and / or is formed as part of the suction nozzle.
  • the tubular suction nozzle leads to an increase in speed the delivery liquid in the impeller inlet region and thus to a reduction in the residence time of gas bubbles in the blade-less space, which counteracts an accumulation of gas bubbles.
  • a braid formation of the solids is prevented.
  • the sealing contact of the flow-influencing agent on the suction nozzle and / or on the housing inner wall supports the flow guidance.
  • suction-side housing wall and the flow-influencing means are formed as part of a housing cover. This allows, if necessary, a conversion of an existing free-flow pump and a quick and easy replacement of a housing cover. Thus, a centrifugal pump can also be retrofitted easily converted to operation with gas-containing delivery fluids.
  • Flow-influencing means may be arranged on one or more radial jets emanating from a suction opening.
  • a reproducible position of the flow-influencing agent or means can be predetermined.
  • the number of mounting locations are different mounting positions of the flow-influencing agent, depending on the operating state of the pump, so for example, full or partial load operation, selectable with a housing cover.
  • the flow guidance in the pump housing of the free-flow pump can be positively influenced.
  • the Fig. 1 shows a centrifugal pump 1 for promoting a permeated with solids and gases pumped liquid.
  • the centrifugal pump 1 has a freely rotating impeller 3 arranged in a housing 2 with impeller blades 4, which is connected to a drive shaft 5. Between a suction-side housing wall 6 and the free-flow impeller 3, a blade-less space 7 is arranged.
  • the centrifugal pump 1 can be connected to a pressure port 8 to a pipeline. Via a suction opening 9, the pumped liquid flows to the pump and it could also be connected to a - not shown here - suction line.
  • the connection for a possible suction line can be designed in the various known forms.
  • the impeller blades 4 opposite to the suction-side housing wall 6, a flow-influencing means 10 is arranged.
  • a predominant part of the suction-side housing wall 6 is formed in this embodiment by a removable, suction-side housing cover 11, with which the - here integrally formed - flow-influencing means 10 is connected.
  • the flow-influencing means may have different shapes, for example, also multi-part, formations.
  • the flow-influencing means 10 on the suction-side housing wall 6 leads in the blade-less space 7 to changed flow paths of the pumped liquid. A partial increase in the flow velocity caused by the flow-influencing means 10 and in its region prevents the accumulation of gases and the formation of undesirable gas accumulations. Gas bubbles are thereby passed into an effective range of the impeller blades 4 and conveyed.
  • the action of the flow-influencing means 10 also achieves a multi-part arrangement of flow-directing elements.
  • the centrifugal pump 1 may have a variety of installation positions and is not limited to the vertical variant shown here.
  • the Fig. 2 shows a suction-side housing cover 12 of a centrifugal pump with a suction port 13 and three attachment locations 14, 15, 16 for fixing the suction-side housing cover 12.
  • a rib 17 is arranged radially as Strömungsbeeinlendes means. It is located on a radial jet of the suction opening 13.
  • the rib 17 is to be understood as a flow-influencing means exemplary shape.
  • Other one- or multi-part shapes of the flow-influencing agent may be square, rectangular, round, semicircular, triangular, polygonal, profile-like, trapezoidal cross section, be designed. Likewise, it can also have an extent that changes in the radial, axial and / or circumferential direction.
  • Fig. 3 shows a further design of a centrifugal pump 18, in which the suction-side housing wall 6 is formed as part of a suction-side housing cover 19.
  • a flow-influencing means 20 is sealingly secured by means of two fastening means 21, 22 on the suction-side housing cover 19.
  • the suction-side housing wall 6 penetrates a suction nozzle 23, which can be designed as an integral or replaceable element.
  • the flow-influencing means 20 sealingly.
  • Such an intake 23 may also be integrally connected to the flow-influencing means 20.
  • the tubular suction nozzle 23 forms with its inner diameter a suction opening 24 of the suction-side housing cover 19 and is fastened with its outer diameter in the housing cover 19.
  • a suction nozzle 23 may also be otherwise connected to the suction-side housing cover 19, for example by means of screw, flange and / or clamp connections.
  • the tubular suction nozzle 23 protrudes into the blade-less space 7 of the centrifugal pump 18. The permeated with solids and gases conveying fluid is thereby fed directly to the impeller blades 4. Outside the centrifugal pump 18, a portion of the suction nozzle 23 is used to improve the inflow conditions.
  • the suction nozzle 23 is funnel-shaped at its suction end.
  • the suction nozzle 23 may also have other designs and / or consist of several, sealingly connected to the suction-side housing cover 19, parts.
  • a suction-side housing cover 25 with a suction port 27 forming suction port 28 is provided.
  • a rib 26 which extends in the radial direction over the flow-guiding region of the suction-side housing cover 25.
  • the rib 26 rests against the tubular suction nozzle 28 and against the housing inner wall 6.
  • the suction nozzle 28 forms in this embodiment, in the Suction opening 27 fitted pipe section.
  • the pressure chamber of the centrifugal pump facing the end of the rib 26 is formed here obliquely.

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

Abstract

The pump has a free flow impeller wheel rotatably mounted in a housing and a blade-free chamber (7) between the impeller wheel and a housing wall (6) on the suction side and a device for preventing flow breakaway. At least one flow-influencing arrangement (10) with one or more parts is provided on the suction side housing wall to protrude into the blade-free chamber opposite the impeller wheel blades (4).

Description

Die Erfindung betrifft eine Kreiselpumpe mit einem in einem Gehäuse rotierend angeordneten Freistromlaufrad, wobei zwischen einer mit einer Saugöffnung versehenen saugseitigen Gehäusewand und dem Freistromlaufrad ein den freien Durchtritt von Feststoffen ermöglichender und sich vor dem Freistromlaufrad durchgängig erstreckender schaufelloser Raum angeordnet ist und die Kreiselpumpe mit einer Einrichtung zur Vermeidung des Abreißens der Strömung versehen istThe invention relates to a centrifugal pump with a rotating in a housing arranged freewheel impeller, wherein between a suction opening provided with a suction housing wall and the free-flow impeller a free passage of solids ermöglichender and is arranged in front of the freewheel impeller continuously extending blade-less space and the centrifugal pump with a device is provided to avoid the tearing of the flow

Kreiselpumpen mit einem Freistromlaufrad dienen vornehmlich der Förderung von festen Bestandteilen enthaltenden Flüssigkeiten. Sie weisen einen schaufellosen Raum zwischen einer saugseitigen Gehäusewand und den Laufradschaufeln auf, um den Durchtritt von Feststoffen störungsfrei durch das Gehäuse zu ermöglichen.Centrifugal pumps with a free-flow impeller serve primarily to convey liquids containing solids. They have a shovel-free space between a suction-side housing wall and the impeller blades to allow the passage of solids through the housing without interference.

Durch die DE-B 2 200 847 , die alle Merkmale des Oberbegriffs des Anspruchs 1 offenbart, ist eine Kreiselpumpe mit vertikaler Anordnung der Laufraddrehachse bekannt. Auf der beschaufelten Seite des Laufrades und in der Nähe der Drehachse ist hier ein einzelner Stift angeordnet. Er verhindert eine Zusammenballung größerer Mengen nicht geförderter, in der Förderflüssigkeit enthaltener fester Bestandteile und damit ein Abreißen der Strömung. Solche Bestandteile werden im Laufradeintrittsbereich vom Stift erfasst und gelangen in den Förderstrom. Eine solche Kreiselpumpe ist bei mit Gas durchsetzten Förderflüssigkeiten, wie sie Abwässer oft darstellen, nur bedingt verwendbar. Während eines Betriebes einer Kreiselpumpe mit Freistromlaufrad kommt es bei feststoff- und gashaltigen Abwässern zu unerwünschten Gasansammlungen innerhalb der Kreiselpumpe. Werden solche Gasblasen zu groß, führt dies zu einem Abreißen der Strömung.By the DE-B 2 200 847 discloses all features of the preamble of claim 1, a centrifugal pump with a vertical arrangement of the impeller rotation axis is known. On the bladed side of the impeller and near the axis of rotation here is a single pin is arranged. It prevents agglomeration of larger amounts of non-promoted, contained in the pumped liquid solid components and thus a tearing of the flow. Such components are detected in the impeller inlet area of the pen and get into the flow. Such a centrifugal pump is only partially usable in gas permeated conveying liquids, as they often represent wastewater. During operation of a centrifugal pump with a free-flow impeller, solids and gaseous effluents cause unwanted gas accumulation inside the centrifugal pump. If such gas bubbles are too large, this leads to a tearing of the flow.

Die CH-A-418835 offenbart eine nach dem Prinzip einer hydraulischen Kupplung gestaltete Kreiselpumpe zum Entwässern von Bohrlöchern. Das durch einen Unterwasserpumpenmotor angetriebene Laufrad weist eine auch bei einer hydraulischen Kupplung verwendete Pumpenlaufradform auf. Mit Abstand vor dem Laufrad ist eine torusförmige saugseitige Gehäusewand angeordnet. Diese ist im Durchmesser kleiner als der Laufradaußendurchmesser. Infolgedessen entsteht in axialer Richtung vor dem Laufrad eine kreisringförmige Eintrittsöffnung für einen Spiralraum, der sich in axialer Richtung der Kreiselpumpe entwickelt. Durch dessen - im Gegensatz zu den üblichen Lösungen - axial nach vorn und radial nach innen stattfindenden Spiralentwicklung wird der Außendurchmesser des Pumpengehäuses klein gehalten, um sie somit innerhalb von Bohrlöchern einsetzen zu können.The CH-A-418835 discloses a centrifugal pump designed according to the principle of a hydraulic coupling for the drainage of boreholes. The impeller driven by an underwater pump motor has a pump impeller shape also used in a hydraulic clutch. At a distance in front of the impeller a toroidal suction-side housing wall is arranged. This is smaller in diameter than the impeller outer diameter. As a result, arises in the axial direction in front of the impeller an annular inlet opening for a spiral space, which develops in the axial direction of the centrifugal pump. By its - in contrast to the usual solutions - axially forward and radially inward held spiral development of the outer diameter of the pump housing is kept small, so they can use within wells can.

Die DE-U-7622070 beschreibt eine selbstreinigende Waschmaschinenpumpe mit einem vor der Pumpe liegenden Filtersystem. Ein zylinderförmiges Pumpengehäuse enthält eine Pumpenkammer und eine Filterkammer, die durch eine Trennwand mit einer Öffnung voneinander getrennt sind. In der Filterkammer ist vor der Saugöffnung eine pilzkopfförmige Scheibe zur Bildung eines Filterspaltes angeordnet. Der für die Fördereigenschaften der Pumpe maßgebende Strömungsraum vor dem Laufrad ist analog einer herkömmlichen Freistrompumpe gestaltet. Mit der zusätzlichen Filterkammer wird ein Durchtritt von Feststoffen definierter Größe zugelassen, die jedoch kleiner sein müssen, als die Saug- und Drucköffnung der Pumpe.The DE-U-7622070 describes a self-cleaning washing machine pump with a front of the pump filter system. A cylindrical pump housing includes a pump chamber and a filter chamber separated by a partition having an opening. In the filter chamber, a mushroom-shaped disk for forming a filter gap is arranged in front of the suction opening. The decisive for the delivery characteristics of the pump flow space in front of the impeller is designed analogous to a conventional free-flow pump. With the additional filter chamber, a passage of solids of defined size is allowed, but must be smaller than the suction and pressure port of the pump.

Die US-A-4 076 179 offenbart eine Abwasserpumpe mit einer an einer saugseitigen Gehäusewand befestigten, mit einem Schneidmesser versehenen Schneidplatte. Diese soll faserige Feststoffe zerkleinern, was einen engen Spalt zwischen Laufradschaufeln und Schneidplatte bedingt.The US-A-4 076 179 discloses a sewage pump with a mounted on a suction-side housing wall, provided with a cutting blade insert. This is to shred fibrous solids, which causes a narrow gap between impeller blades and insert.

Der Erfindung liegt die Aufgabe zugrunde, bei Kreiselpumpen mit Freistromlaufrad eine sichere Förderung von feststoff- und gashaltigen Förderflüssigkeiten zu gewährleisten und ein Abreißen der Strömung zu vermeiden.The invention has for its object to ensure at centrifugal pumps with free-flow impeller safe delivery of solid and gas-containing delivery liquids and to avoid tearing the flow.

Die Lösung dieses Problems sieht vor, dass gegenüberliegend zu den Laufradschaufeln und an der saugseitigen Gehäusewand mindestens ein axial vorstehendes, den schaufellosen Raum lokal verkleinerndes, ein- oder mehrteiliges, strömungsbeeinflussendes Mittel auf einem oder mehreren von der Saugöffnung ausgehenden Radialstrahlen angeordnet ist. Das im Gegensatz zum rotierenden Laufrad stillstehende strömungsbeeinflussende Mittel an der saugseitigen Gehäuseinnenwand zwingt die Förderflüssigkeit im schaufellosen Raum zwischen saugseitiger Gehäuseinnenwand und den Laufradschaufeln auf einen sich an das Laufrad annähernden Strömungspfad. Durch die erzwungene lokale Annäherung an das Laufrad verwirbelt dieses eine mögliche Anlagerung von Gasen in Räumen niedrigen Drucks und verhindert die Bildung unerwünschter Gasansammlungen. Bereits kleine Gasblasen werden durch das strömungsbeeinflussende Mittel an der saugseitigen Gehäusewand in den förderwirksamen Bereich der Laufradschaufen gebracht und weggefördert. Ein Abreißen der Strömung wird dadurch sicher verhindert.The solution to this problem provides that opposite to the impeller blades and on the suction-side housing wall at least one axially projecting, one-piece or multi-part, flow-influencing means localizing the paddle-free space is arranged on one or more of the suction opening outgoing radial jets. The in contrast to the rotating impeller flow-influencing means on the suction-side housing inner wall forces the pumped liquid in the blade-less space between the suction-side housing inner wall and the impeller blades on a approaching the impeller flow path. By forced local approach to the impeller, this swirls a possible accumulation of gases in rooms of low pressure and prevents the formation of unwanted gas accumulations. Even small gas bubbles are brought by the flow-influencing means on the suction-side housing wall in the effective range of the impeller blades and conveyed away. A tearing off of the flow is thereby reliably prevented.

Eine Ausgestaltung der Erfindung sieht vor, dass das strömungsbeeinflussende Mittel eine radial verlaufende und axial vorstehende Rippe ist. Die radiale Erstreckung einer solchen Rippe kann gleich, kleiner oder größer als die Erstreckung der Laufradschaufeln sein. Durch eine Änderung der radialen und/oder axialen Erstreckung und auch durch Anpassung der Rippenform an den Freistromraum erfolgt eine Optimierung der Wirksamkeit des strömungsbeeinflussenden Mittels.An embodiment of the invention provides that the flow-influencing means is a radially extending and axially projecting rib. The radial extent of such a rib may be equal to, smaller or larger than the extent of the impeller blades. By changing the radial and / or axial extent and also by adapting the rib shape to the free-flow space, the effectiveness of the flow-influencing agent is optimized.

Weitere Ausgestaltungen sehen vor, dass ein rohrförmiger Saugstutzen in den schaufellosen Raum hineinragt, dass das strömungsbeeinflussende Mittel dichtend am Saugstutzen und/oder an der saugseitigen Gehäusewand anliegt und/oder als Bestandteil des Saugstutzens ausgebildet ist. Der rohrförmige Saugstutzen führt zu einer Geschwindigkeitserhöhung der Förderflüssigkeit im Laufradeintrittsbereich und damit zu einer Reduzierung der Verweilzeit von Gasblasen im schaufellosen Raum, was einer Ansammlung von Gasblasen entgegenwirkt. Zudem wird durch die direkte Zuführung der Förderflüssigkeit zu den Laufradschaufeln eine Zopfbildung der Feststoffe verhindert. Die dichtende Anlage des strömungsbeeinflussenden Mittels am Saugstutzen und/oder an der Gehäuseinnenwand unterstützt die Strömungsführung.Further embodiments provide that a tubular suction nozzle protrudes into the blade-less space that the flow-influencing means sealingly abuts the suction nozzle and / or on the suction-side housing wall and / or is formed as part of the suction nozzle. The tubular suction nozzle leads to an increase in speed the delivery liquid in the impeller inlet region and thus to a reduction in the residence time of gas bubbles in the blade-less space, which counteracts an accumulation of gas bubbles. In addition, by the direct supply of the pumped liquid to the impeller blades, a braid formation of the solids is prevented. The sealing contact of the flow-influencing agent on the suction nozzle and / or on the housing inner wall supports the flow guidance.

Es hat sich als vorteilhaft erwiesen, dass die saugseitige Gehäusewand und das strömungsbeeinflussende Mittel als Bestandteil eines Gehäusedeckels ausgebildet sind. Dies ermöglicht im Bedarfsfall eine Umrüstung einer bestehenden Freistrompumpe und einen schnellen und einfachen Austausch eines Gehäusedeckels. Somit kann eine Kreiselpumpe auch nachträglich einfach auf einen Betrieb mit gashaltigen Förderflüssigkeiten umgerüstet werden.It has proved to be advantageous that the suction-side housing wall and the flow-influencing means are formed as part of a housing cover. This allows, if necessary, a conversion of an existing free-flow pump and a quick and easy replacement of a housing cover. Thus, a centrifugal pump can also be retrofitted easily converted to operation with gas-containing delivery fluids.

Strömungsbeeinflussende Mittel können auf einem oder mehreren von einer Saugöffnung ausgehenden Radialstrahlen angeordnet sein. Damit sowie mit der Ausgestaltung, dass ein strömungsbeeinflussendes Mittel auf einem Radialstrahl zwischen einer Saugöffnung und einem Befestigungsort des Gehäusedeckels angeordnet ist, lässt sich eine reproduzierbare Position des oder der strömungsbeeinflussenden Mittel vorgeben. Entsprechend der Anzahl der Befestigungsorte sind mit einem Gehäusedeckel verschiedene Einbaulagen des strömungsbeeinflussenden Mittels, je nach Betriebszustand der Pumpe, also beispielsweise Voll- oder Teillastbetrieb, wählbar.Flow-influencing means may be arranged on one or more radial jets emanating from a suction opening. Thus, as well as with the configuration that a flow-influencing agent is arranged on a radial jet between a suction opening and a fastening location of the housing cover, a reproducible position of the flow-influencing agent or means can be predetermined. Depending on the number of mounting locations are different mounting positions of the flow-influencing agent, depending on the operating state of the pump, so for example, full or partial load operation, selectable with a housing cover.

Durch die lösbare Befestigung des strömungsbeeinflussenden Mittels und/oder des Saugstutzens ergibt sich eine nachträgliche Anpassungsoption einer Kreiselpumpe mit verschiedenen strömungsbeeinflussenden Mitteln. Eine Kreiselpumpe kann also erst im Bedarfsfall mit einem strömungsbeeinflussenden Mittel ausgestattet werden. Dabei ist durch die lösbare Befestigung eine problemlose, fallweise Anpassung an die jeweiligen Förderflüssigkeitszusammensetzungen gegeben. Verschiedene Formen und/oder Einbaupositionen haben sich in praktischen Versuchen als erfolgreich erwiesen.The detachable fastening of the flow-influencing means and / or the suction nozzle results in a subsequent adaptation option of a centrifugal pump with different flow-influencing means. A centrifugal pump can therefore only be equipped if necessary with a flow-influencing agent. This is given by the releasable attachment a problem-free, occasional adaptation to the respective Förderflüssigkeitszusammensetzungen. Various shapes and / or mounting positions have proven successful in practical experiments.

Mit der Ausgestaltung, wonach das strömungsbeeinflussende Mittel in den Druckraum und/oder in die Saugöffnung der Pumpe hineinragt, kann die Strömungsführung im Pumpengehäuse der Freistrompumpe positiv beeinflusst werden.With the embodiment according to which the flow-influencing means projects into the pressure space and / or into the suction opening of the pump, the flow guidance in the pump housing of the free-flow pump can be positively influenced.

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

Fig. 1
eine Kreiselpumpe mit Freistromrad und strömungsbeeinflussendem Mittel an einer saugseitigen Gehäusewand, die
Fig. 2
einen saugseitigen Gehäusedeckel mit einer radial angeordneten Rippe, die
Fig. 3
eine Kreiselpumpe mit saugseitigem Gehäusedeckel mit einer anderen Rippenform und mit einem Saugstutzen und die
Fig. 4
einen weiteren saugseitigen Gehäusedeckel.
Embodiments of the invention are illustrated in the drawings and will be described in more detail below. It show the
Fig. 1
a centrifugal pump with free-flow and flow-influencing means on a suction-side housing wall, the
Fig. 2
a suction-side housing cover with a radially disposed rib, the
Fig. 3
a centrifugal pump with suction-side housing cover with a different rib shape and with a suction nozzle and the
Fig. 4
another suction-side housing cover.

Die Fig. 1 zeigt eine Kreiselpumpe 1 zur Förderung einer mit Feststoffen und Gasen durchsetzten Förderflüssigkeit. Die Kreiselpumpe 1 weist ein in einem Gehäuse 2 rotierend angeordnetes Freistromlaufrad 3 mit Laufradschaufeln 4 auf, welches mit einer Antriebswelle 5 verbunden ist. Zwischen einer saugseitigen Gehäusewand 6 und dem Freistromlaufrad 3 ist ein schaufelloser Raum 7 angeordnet. Die Kreiselpumpe 1 ist mit einem Druckstutzen 8 an eine Rohrleitung anschließbar. Über eine Saugöffnung 9 strömt die Förderflüssigkeit der Pumpe zu und daran könnte auch eine - hier nicht dargestellte - Saugleitung angeschlossen werden. Der Anschluss für eine mögliche Saugleitung kann in den verschiedenen bekannten Formen gestaltet sein.The Fig. 1 shows a centrifugal pump 1 for promoting a permeated with solids and gases pumped liquid. The centrifugal pump 1 has a freely rotating impeller 3 arranged in a housing 2 with impeller blades 4, which is connected to a drive shaft 5. Between a suction-side housing wall 6 and the free-flow impeller 3, a blade-less space 7 is arranged. The centrifugal pump 1 can be connected to a pressure port 8 to a pipeline. Via a suction opening 9, the pumped liquid flows to the pump and it could also be connected to a - not shown here - suction line. The connection for a possible suction line can be designed in the various known forms.

Den Laufradschaufeln 4 gegenüberliegend ist an der saugseitigen Gehäusewand 6 ein strömungsbeeinflussendes Mittel 10 angeordnet. Dabei wird in diesem Ausführungsbeispiel ein überwiegender Teil der saugseitigen Gehäusewand 6 durch einen abnehmbaren, saugseitigen Gehäusedeckel 11 gebildet, mit dem das - hier einteilig ausgebildete - strömungsbeeinflussende Mittel 10 verbunden ist. Das strömungsbeeinflussende Mittel kann verschiedene Gestaltsformen, beispielsweise auch mehrteilige, Ausbildungen aufweisen. Das strömungsbeeinflussende Mittel 10 an der saugseitigen Gehäusewand 6 führt im schaufellosen Raum 7 zu geänderten Strömungspfaden der Förderflüssigkeit. Eine durch das strömungsbeeinflussende Mittel 10 und in dessen Bereich bedingte, partielle Erhöhung der Strömungsgeschwindigkeit verhindert eine Anlagerung von Gasen und eine Bildung unerwünschter Gasansammlungen. Gasblasen werden dadurch in einen förderwirksamen Bereich der Laufradschaufeln 4 geleitet und mitgefördert. Die Wirkung des strömungsbeeinflussenden Mittels 10 erreicht auch eine mehrteilige Anordnung von strömungslenkenden Elementen. Die Kreiselpumpe 1 kann die verschiedensten Einbaulagen aufweisen und ist nicht auf die hier dargestellte vertikale Variante beschränkt.The impeller blades 4 opposite to the suction-side housing wall 6, a flow-influencing means 10 is arranged. In this case, a predominant part of the suction-side housing wall 6 is formed in this embodiment by a removable, suction-side housing cover 11, with which the - here integrally formed - flow-influencing means 10 is connected. The flow-influencing means may have different shapes, for example, also multi-part, formations. The flow-influencing means 10 on the suction-side housing wall 6 leads in the blade-less space 7 to changed flow paths of the pumped liquid. A partial increase in the flow velocity caused by the flow-influencing means 10 and in its region prevents the accumulation of gases and the formation of undesirable gas accumulations. Gas bubbles are thereby passed into an effective range of the impeller blades 4 and conveyed. The action of the flow-influencing means 10 also achieves a multi-part arrangement of flow-directing elements. The centrifugal pump 1 may have a variety of installation positions and is not limited to the vertical variant shown here.

Die Fig. 2 zeigt einen saugseitigen Gehäusedeckel 12 einer Kreiselpumpe mit einer Saugöffnung 13 und drei Befestigungsorten 14, 15, 16 zur Befestigung des saugseitigen Gehäusedeckels 12. An dem saugseitigen Gehäusedeckel 12 ist als strömungsbeeinflussendes Mittel eine Rippe 17 radial angeordnet. Sie befindet sich auf einem Radialstrahl der Saugöffnung 13. Durch eine um jeweils 120 Grad gedrehte Befestigung des saugseitigen Gehäusedeckels 12 am Kreiselpumpengehäuse 2 sind mit dem selben Gehäusedeckel 12 drei verschiedene Positionen der Rippe 17 zum Kreiselpumpengehäuse 2 wählbar, wodurch eine leichte Anpassung an eine Förderflüssigkeit, eine Einbaulage und/oder einen Betriebspunkt der Kreiselpumpe erfolgt. Auch hier ist die Rippe 17 als ein strömungsbeeinflussendes Mittel exemplarischer Gestalt zu verstehen. Andere ein- oder mehrteilige Gestaltsformen des strömungsbeeinflussenden Mittels können mit quadratischem, rechteckigem, rundem, halbrundem, dreieckigem, polygonalem, profilartigem, trapezförmigem Querschnitt, gestaltet sein. Ebenso kann es auch eine sich in radialer, axialer und/oder Umfangsrichtung ändernde Erstreckung aufweisen.The Fig. 2 shows a suction-side housing cover 12 of a centrifugal pump with a suction port 13 and three attachment locations 14, 15, 16 for fixing the suction-side housing cover 12. At the suction-side housing cover 12 is a rib 17 is arranged radially as Strömungsbeeinflussendes means. It is located on a radial jet of the suction opening 13. By a rotated by 120 degrees attachment of the suction-side housing cover 12 on the centrifugal pump housing 2 with the same housing cover 12 three different positions of the rib 17 can be selected to the centrifugal pump housing 2, whereby easy adaptation to a pumped liquid, an installation position and / or an operating point of the centrifugal pump takes place. Again, the rib 17 is to be understood as a flow-influencing means exemplary shape. Other one- or multi-part shapes of the flow-influencing agent may be square, rectangular, round, semicircular, triangular, polygonal, profile-like, trapezoidal cross section, be designed. Likewise, it can also have an extent that changes in the radial, axial and / or circumferential direction.

Fig. 3 zeigt eine weitere Bauform einer Kreiselpumpe 18, bei der die saugseitige Gehäusewand 6 als ein Bestandteil eines saugseitigen Gehäusedeckels 19 ausgebildet ist. Ein strömungsbeeinflussendes Mittel 20 ist mittels zweier Befestigungsmittel 21, 22 am saugseitigen Gehäusedeckel 19 dichtend befestigt. Weiterhin durchdringt die saugseitige Gehäusewand 6 ein Saugstutzen 23, der als ein integrales oder auswechselbares Element gestaltet sein kann. An diesem rohrförmigen Saugstutzen 23 liegt das strömungsbeeinflussende Mittel 20 dichtend an. Ein solcher Saugstutzen 23 kann auch einstückig mit dem strömungsbeeinflussenden Mittel 20 verbunden sein. Der rohrförmige Saugstutzen 23 bildet mit seinem Innendurchmesser eine Saugöffnung 24 des saugseitigen Gehäusedeckels 19 und ist mit seinem Aussendurchmesser im Gehäusedeckel 19 befestigt. Alternativ dazu kann ein Saugstutzen 23 auch anders mit dem saugseitigen Gehäusedeckel 19 verbunden sein, beispielsweise mittels Schraub-, Flansch- und/oder Klemmverbindungen. Der rohrförmige Saugstutzen 23 ragt in den schaufellosen Raum 7 der Kreiselpumpe 18 hinein. Die mit Feststoffen und Gasen durchsetzte Förderflüssigkeit wird dadurch direkter den Laufradschaufeln 4 zugeführt. Ausserhalb der Kreiselpumpe 18 dient ein Teil des Saugstutzens 23 zur Verbesserung der Zuströmbedingungen. Dazu ist der Saugstutzen 23 an seinem saugseitigen Ende trichterförmig gestaltet. Der Saugstutzen 23 kann auch andere Bauformen aufweisen und/oder aus mehreren, mit dem saugseitigen Gehäusedeckel 19 dichtend verbundenen, Teilen bestehen. Fig. 3 shows a further design of a centrifugal pump 18, in which the suction-side housing wall 6 is formed as part of a suction-side housing cover 19. A flow-influencing means 20 is sealingly secured by means of two fastening means 21, 22 on the suction-side housing cover 19. Furthermore, the suction-side housing wall 6 penetrates a suction nozzle 23, which can be designed as an integral or replaceable element. At this tubular suction nozzle 23 is the flow-influencing means 20 sealingly. Such an intake 23 may also be integrally connected to the flow-influencing means 20. The tubular suction nozzle 23 forms with its inner diameter a suction opening 24 of the suction-side housing cover 19 and is fastened with its outer diameter in the housing cover 19. Alternatively, a suction nozzle 23 may also be otherwise connected to the suction-side housing cover 19, for example by means of screw, flange and / or clamp connections. The tubular suction nozzle 23 protrudes into the blade-less space 7 of the centrifugal pump 18. The permeated with solids and gases conveying fluid is thereby fed directly to the impeller blades 4. Outside the centrifugal pump 18, a portion of the suction nozzle 23 is used to improve the inflow conditions. For this purpose, the suction nozzle 23 is funnel-shaped at its suction end. The suction nozzle 23 may also have other designs and / or consist of several, sealingly connected to the suction-side housing cover 19, parts.

In Fig. 4 ist ein saugseitiger Gehäusedeckel 25 mit einem die Saugöffnung 27 bildenden Saugstutzen 28 versehen. Damit verbunden ist eine Rippe 26, die sich in radialer Richtung über den strömungsführenden Bereich des saugseitigen Gehäusedeckels 25 erstreckt. Die Rippe 26 liegt an dem rohrförmigen Saugstutzen 28 und an der Gehäuseinnenwand 6 an. Der Saugstutzen 28 bildet in diesem Ausführungsbeispiel ein in die Saugöffnung 27 eingepasstes Rohrstück. Das dem Druckraum der Kreiselpumpe zugekehrte Ende der Rippe 26 ist hier schräg verlaufend ausgebildet.In Fig. 4 is a suction-side housing cover 25 with a suction port 27 forming suction port 28 is provided. Connected thereto is a rib 26, which extends in the radial direction over the flow-guiding region of the suction-side housing cover 25. The rib 26 rests against the tubular suction nozzle 28 and against the housing inner wall 6. The suction nozzle 28 forms in this embodiment, in the Suction opening 27 fitted pipe section. The pressure chamber of the centrifugal pump facing the end of the rib 26 is formed here obliquely.

Claims (9)

  1. Centrifugal pump, with a vortex impeller arranged rotatably in a casing, there being arranged between a suction-side casing wall provided with a suction port and the vortex impeller a bladeless space which allows the free passage of solids and extends continuously in front of the vortex impeller, and the centrifugal pump being provided with a device for preventing the stalling of the flow, characterized in that, opposite the impeller blades (4) and on the suction-side casing wall (6), at least one axially projecting one-part or multi-part flow-influencing means (10, 17, 20, 26) locally reducing the bladeless space (7) is arranged on one or more radial lines emanating from the suction port (9, 13, 24, 27).
  2. Centrifugal pump according to Claim 1, characterized in that the flow-influencing means (10, 17, 20, 26) is a rib (17, 26) running radially and projecting axially.
  3. Centrifugal pump according to Claim 1 or 2, characterized in that a tubular suction connection piece (23, 28) projects into the bladeless space (7).
  4. Centrifugal pump according to Claim 1, 2 or 3, characterized in that the flow-influencing means (10, 17, 20, 26) bears sealingly against the suction connection piece (23, 28) and/or against the suction-side casing wall (6).
  5. Centrifugal pump according to one of Claims 1 to 4, characterized in that the flow-influencing means (10, 17, 20, 26) is designed as an integral part of the suction connection piece (23, 28).
  6. Centrifugal pump according to one of Claims 1 to 5, characterized in that the suction-side casing wall (6) and the flow-influencing means (10, 17, 20, 26) are designed as an integral part of a casing cover (11, 12, 19, 25).
  7. Centrifugal pump according to Claim 6, characterized in that a flow-influencing means (10, 17, 20, 26) is arranged on a radial line between a suction port (9, 13, 24, 27) and a fastening location (14, 15, 16) of the casing cover (11, 12, 19, 25).
  8. Centrifugal pump according to one of Claims 1 to 7, characterized in that the flow-influencing means (10, 17, 20, 26) and/or the suction connection piece (23, 28) are/is fastened releasably.
  9. Centrifugal pump according to one of Claims 1 to 8, characterized in that the flow-influencing means (10, 17, 20, 26) projects into the pressure space and/or into the suction port (9, 13, 24, 27) of the pump.
EP07005864A 2006-03-28 2007-03-22 Rotary pump with free flow wheel Active EP1840379B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE202006005073U DE202006005073U1 (en) 2006-03-28 2006-03-28 Centrifugal pump with free-flow impeller

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EP1840379A2 EP1840379A2 (en) 2007-10-03
EP1840379A3 EP1840379A3 (en) 2007-11-07
EP1840379B1 true EP1840379B1 (en) 2011-06-22

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ID=36600018

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Application Number Title Priority Date Filing Date
EP07005864A Active EP1840379B1 (en) 2006-03-28 2007-03-22 Rotary pump with free flow wheel

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EP (1) EP1840379B1 (en)
AT (1) ATE513997T1 (en)
DE (1) DE202006005073U1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
DE102008030112A1 (en) * 2008-06-27 2009-12-31 Ksb Aktiengesellschaft Centrifugal pump with free-flow impeller
DE102010052036A1 (en) 2010-11-23 2012-05-24 Ebm-Papst Landshut Gmbh Pump for pumping liquids
US9441875B1 (en) * 2015-04-22 2016-09-13 Electrolux Home Products, Inc. Storage assemblies for discrete storage units

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH418835A (en) 1963-10-05 1966-08-15 Schwarze Pumpe Schwarze Pumpe Centrifugal pump
IT1040087B (en) 1975-07-25 1979-12-20 Eurodomestici Ind Riunite SELF-CLEANING DRAINAGE PUMP IN PARTICULAR FOR WASHING MACHINES
DE2714376C3 (en) * 1977-03-31 1980-08-28 Klein, Schanzlin & Becker Ag, 6710 Frankenthal Centrifugal pump with an open impeller
MX157817A (en) * 1981-12-08 1988-12-15 Emule Egger & Cie S A IMPROVEMENTS TO FLUID FREE CIRCULATION ROTARY PUMP
DE3626754A1 (en) * 1986-08-07 1988-02-11 Klein Schanzlin & Becker Ag Centrifugal pump with open impeller
SE9303475L (en) * 1993-10-22 1994-11-28 Flygt Ab Itt Pump housing for eddy current pump

Also Published As

Publication number Publication date
EP1840379A2 (en) 2007-10-03
ATE513997T1 (en) 2011-07-15
DE202006005073U1 (en) 2006-06-08
EP1840379A3 (en) 2007-11-07

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