EP2348220B1 - Immersion pump - Google Patents

Immersion pump Download PDF

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Publication number
EP2348220B1
EP2348220B1 EP09016147.2A EP09016147A EP2348220B1 EP 2348220 B1 EP2348220 B1 EP 2348220B1 EP 09016147 A EP09016147 A EP 09016147A EP 2348220 B1 EP2348220 B1 EP 2348220B1
Authority
EP
European Patent Office
Prior art keywords
sealing ring
impeller
recess
submersible pump
pump
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.)
Active
Application number
EP09016147.2A
Other languages
German (de)
French (fr)
Other versions
EP2348220A1 (en
Inventor
Poul Johannes Henning
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.)
Grundfos Management AS
Original Assignee
Grundfos Management AS
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 Grundfos Management AS filed Critical Grundfos Management AS
Priority to EP09016147.2A priority Critical patent/EP2348220B1/en
Priority to PCT/EP2010/007100 priority patent/WO2011079892A1/en
Priority to US13/519,983 priority patent/US9234523B2/en
Priority to RU2012132482/06A priority patent/RU2534193C2/en
Priority to CN201080060111.1A priority patent/CN102686886B/en
Publication of EP2348220A1 publication Critical patent/EP2348220A1/en
Application granted granted Critical
Publication of EP2348220B1 publication Critical patent/EP2348220B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/08—Sealings
    • F04D29/10—Shaft sealings
    • F04D29/12—Shaft sealings using sealing-rings
    • F04D29/126—Shaft sealings using sealing-rings 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
    • F04D29/00—Details, component parts, or accessories
    • F04D29/08—Sealings
    • F04D29/16—Sealings between pressure and suction sides
    • F04D29/165—Sealings between pressure and suction sides especially adapted for liquid pumps
    • F04D29/167—Sealings between pressure and suction sides especially adapted for liquid pumps of a centrifugal flow wheel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
    • F04D13/08—Units comprising pumps and their driving means the pump being electrically driven for submerged use
    • F04D13/086—Units comprising pumps and their driving means the pump being electrically driven for submerged use the pump and drive motor are both submerged
    • 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
    • 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
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2260/00—Function
    • F05B2260/60—Fluid transfer
    • F05B2260/602—Drainage
    • F05B2260/603—Drainage of leakage having past a seal
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2260/00—Function
    • F05B2260/60—Fluid transfer
    • F05B2260/63—Preventing clogging or obstruction of flow paths by dirt, dust, or foreign particles
    • 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
    • F05D2260/607—Preventing clogging or obstruction of flow paths by dirt, dust, or foreign particles

Definitions

  • the invention relates to a submersible pump.
  • submersible pumps for pumping off solids mixed with wastewater. These pumps are usually equipped with a single-channel or a multi-channel impeller for conveying the waste water. Such a submersible pump is for example off EP 1 300 594 B1 known.
  • the pump described therein has on the input side of its impeller in the region of the suction mouth a cutting device which comminutes the solids contained in the wastewater to be pumped in order to prevent blocking of the pump impeller.
  • the sewage pumping proves to be unproblematic with this pump, but also the crushed solid components as well as sucked by the pump air can penetrate into the comparatively large cavity of the impeller and thus lead to vibrations and resulting flow noise.
  • the invention has the object to provide an improved pump of the above type, are at least reduced in the impeller vibrations and associated noise and preferably prevented and in which the pump housing sealing shaft seal is protected from particulate located in the impeller ,
  • the submersible pump according to the invention has an impeller arranged in a pump housing, in particular a single-channel impeller with a cavity in the interior.
  • the impeller may have all the usual impeller types impeller shapes.
  • the submersible pump is equipped with a seal that seals the impeller against a fixed part of the pump housing. In particular, this seal prevents ingress of solids and contaminants into at least one cavity located in the interior of the impeller, outside a flow channel.
  • This seal has a wheel arranged on the side sealing ring, which engages in a pump housing side arranged second outer sealing ring.
  • the impeller-side sealing ring is firmly connected to the impeller and consequently rotates with the rotating impeller.
  • the pump housing side arranged sealing ring is rotatably fixed in the pump housing.
  • the two sealing rings used form a radial seal, which is preferably arranged in the region of the outer circumference of the impeller and the impeller, and in particular its cavities with respect to the liquid-flow-through interior of the pump housing seals.
  • the invention is based on the idea that in the impeller interior, i. In a cavity of the impeller located particulate matter or accumulating there air through the seal in a Beeich outside the impeller to dissipate.
  • the pump housing-side sealing ring according to the invention at least one recess for the removal of solid particles.
  • only one recess is preferably formed on this sealing ring, if necessary, this sealing ring can also have a plurality of recesses.
  • the gap located between the impeller-side sealing ring and the substantially adjacent pumping-side sealing ring is expediently dimensioned and / or configured such that solid particles can penetrate into this gap and then on the pump housing side arranged outer sealing ring formed recess can escape from the seal in the adjoining liquid-flowed cavity of the pump housing.
  • the gap on a design and dimensioning which on the one hand allows to dissipate air through the gap from the impeller interior, on the other hand, however, can prevent the penetration of solids into the cavity of the impeller.
  • the impeller-side sealing ring has on its outer side at least one driver for transporting solid particles on.
  • driver can be generated for example via a relief-like topography of the outer peripheral surface of the impeller-side sealing ring, take in the projections and / or depressions in the sealing gap befindliches solid particles in the rotation of the impeller-side sealing ring and move to the recess formed on the pump housing side sealing ring, where they the environment of the seal are delivered.
  • the submersible pump according to the invention is preferably a vertically mounted pump, in which the intake region is arranged in the region of a lower end of the pump below a vertically mounted impeller.
  • air which has been sucked in by the submersible pump may possibly collect in an upper impeller region, in particular in a cavity of the impeller.
  • the submersible pump according to the invention which arrange the impeller or its cavity relative to a fixed part of the pump housing sealing seal on an axially spaced from the suction mouth of the pump end of the impeller.
  • both the impeller-side and the pump housing side arranged sealing ring may have a hollow cylindrical shape.
  • sealing rings with a sleeve shape can be used as sealing rings.
  • the pump-housing-side seal ring overlap the attached to the impeller seal on the outside or circumferentially in the axial direction in a relatively large area, which can be realized correspondingly good sealing properties. That a sealing ring, preferably the pump housing side sealing ring surrounds the other sealing ring circumferentially.
  • a driver formed on the outer or peripheral side of the impeller-side sealing ring or a plurality of entrainment members provided there for transporting solid particles may be formed by a relief-like surface structure formed on the outer circumferential surface of this sealing ring.
  • the impeller-side sealing ring has at least one recess on its outer circumference.
  • a plurality of depressions are formed uniformly distributed around the circumference of the sealing ring.
  • the recesses formed on the impeller-side sealing ring serve to receive the solid particles. To make these solid particles out To be able to transport out of the seal, it proves to be particularly useful if the recess formed on the pump-housing-side sealing ring is arranged and formed so that it completely releases the at least one recess of the impeller-side sealing ring. That is, when the recess of the impeller-side sealing ring is located at the same angular position as the recess, recess and recess lie one above the other.
  • an embodiment in which, by rotation of the impeller side sealing ring relative to the pump housing side sealing ring formed on the impeller side sealing recess or depressions are moved to a position in which they are not covered by this seal due to the recess formed on the pump housing side sealing ring become. Solid particles located in a depression can then fall out of the depression into the pump housing at this point.
  • the recess formed on the pump-housing-side sealing ring is expediently arranged in a region of the pump housing through which fluid flows, which is flow-connected to the pressure connection of the pump.
  • the recess is arranged on a portion of the sealing ring, which faces a low-pressure region of the pump housing.
  • a low-pressure region of the pump housing means such a fluid-flow area in the outlet manifold of the pump housing in which a lower fluid pressure than at the pressure port, i. the outlet cross-section of the pump is present.
  • the recess formed on the pump-housing-side sealing ring is preferably formed on an axial outer edge of the sealing ring. Typically, this outer edge of the sealing ring around the edge, which faces the impeller of the pump.
  • the recess is therefore preferably arranged in the region of the pump-housing-side sealing ring which is the farthest away from the free end of the wheel-side sealing ring engaging therein.
  • an edge delimiting the recess can form a cutting edge at least in sections.
  • at least one edge section has such a tapering geometry, for example, by a corresponding bevel, which gives this edge section a certain sharpness.
  • This sharpened edge region serves to shred the transported through the seal to the recess of the pump housing side sealing ring solid particles before release into the pump housing.
  • the cutting edge formed on the edge defining the recess is formed on an edge portion of the recess facing the direction of rotation of the impeller. This is meaningful insofar as, during the rotation of the impeller, the solid particles carried by the sealing ring attached to this impeller are transported directly to the cutting edge, i. whose cutting edge are moved in the cutting direction.
  • the section forming the cutting edge is oriented at an angle of 15-90 ° relative to the outer side of the sealing ring.
  • the angle formed by the cutting edge with the outer end face of the pump housing-side sealing ring greater than 35 °, since it has been shown that at smaller angles there is a risk that can be deposited on the cutting edge of solid particles on the cutting edge, without to be cut as desired.
  • An edge portion of the recess arranged opposite the cutting edge can also be chamfered with respect to the outer end face of the sealing ring, so that the recess can have a substantially wedge-shaped or trapezoidal outer contour.
  • the cutting edge of the oppositely arranged edge portion relative to the outer end side of the sealing ring advantageously also be aligned at an angle of 15-90 °, although it is preferably provided that this angle is greater than the angle between the cutting edge and the outer end face of the sealing ring is.
  • submersible is a vertical submersible pump.
  • This submersible pump has in common Weise a two-part housing with a pump housing 2 and a motor housing 4, which is arranged above the pump housing 2.
  • a plurality of feet 6 of the submersible pump are arranged annularly, which surround a suction of the submersible pump.
  • an impeller 8 is rotatably mounted in a direction of rotation B about a longitudinal axis A of the pump housing 2 ( Fig. 5 ).
  • the impeller 8 is a so-called single-channel impeller having an impeller passage 10 extending from a suction port 12 located at an axial end of the impeller 8 to the circumference of the impeller.
  • a cavity or cavity 14 is formed in the interior of the impeller 8, which is open to the axial side of the impeller 8 remote from the suction mouth 12.
  • a fluid-carrying outlet manifold 16 is formed radially outside the impeller 8 ( Fig. 6 ), which opens into a pressure port 18 of the pump housing 2.
  • the impeller 8 is sealed in the pump housing 2 with respect to a component 20 fixed there by means of a seal 22.
  • the seal 22 is formed by a sealing ring 24 formed on the impeller 8 and by a sealing ring 26 formed on the component 20, the impeller-side sealing ring 24 engaging in the sealing ring 26 formed on the component 20.
  • the sealing ring 24 is arranged on the side facing away from the suction mouth 12 front end of the impeller 8, while the sealing ring 26 is disposed on the component 20 of the pump housing on a side facing the impeller 8. Both sealing rings 24 and 26 are substantially hollow cylindrical, which are arranged concentrically with each other.
  • a recess 28 is formed, on which the otherwise surrounded by the sealing ring 26 impeller-side sealing ring 24 is exposed.
  • the recess 28 is arranged in its angular position with respect to the longitudinal axis A in a spaced from the pressure port 18 low-pressure region of the outlet manifold 16 ( Fig. 6 ) and extends from an end face of the sealing ring 26 facing the impeller 8 in the direction of the component 20, wherein the width of the recess 28 tapers trapezoidally in the direction of the component 20.
  • the adjacent to the end face of the sealing ring 26 and opposite side edges 30 and 32 of the recess 28 are each beveled with respect to the end face of the sealing ring 28.
  • the direction of rotation B of the impeller 8 facing side edge 30 is angled relative to the end face of the sealing ring 26 at an angle of approximately 45 ° and the side edge 30 opposite side edge 32 angled relative to the end face of the sealing ring 26 at an angle of about 60 ° ,
  • the wall thickness of the sealing ring 26 tapers continuously in the region of the side edge 30 and thus forms a cutting edge 30, whose function will be explained in more detail below.
  • each trough-shaped recesses 34 are formed starting from the front end of the sealing ring 24. These recesses 34 are uniformly spaced from each other distributed over the circumference of the sealing ring 24.
  • the depressions 34, together with the recess 28 formed on the sealing ring 26, serve to remove solid particles which may otherwise be present in the cavity 14 of the impeller 8, which would otherwise lead to undesired impeller vibrations and associated noises, via the seal 22 into the outlet manifold 16.
  • the recesses 34 are provided for receiving these solid particles.
  • the recesses 34 serve to transport the solid particles to the recess 28 of the sealing ring 26, where the recesses 34 are no longer covered by the sealing ring 26 so that in the recesses 34 located particulate matter can be discharged into the adjacent to the recess 28 low pressure region of the outlet manifold 16. Due to the impeller rotation, protruding solid particles, for example solid fibers, against the cutting edge 30 are pressed out of the recesses 34 in the region of the recess 28 and are comminuted in this way.

Description

Beschreibungdescription

Die Erfindung betrifft eine Tauchpumpe.The invention relates to a submersible pump.

Es ist üblich, Tauchpumpen zum Abpumpen von mit Feststoffen versetzten Abwässern einzusetzen. Diese Pumpen sind in der Regel mit einem Einkanal- oder einem Mehrkanallaufrad zum Fördern des Abwassers ausgestattet. Eine solche Tauchpumpe ist beispielsweise aus EP 1 300 594 B1 bekannt. Die dort beschriebene Pumpe weist eingangsseitig ihres Laufrads im Bereich des Saugmundes eine Schneidvorrichtung auf, die die in dem zu fördernden Abwasser enthaltenen Feststoffe zerkleinert, um ein Blockieren des Pumpenlaufrads zu verhindern. In der Regel erweist sich die Abwasserförderung mit dieser Pumpe als unproblematisch, allerdings können auch die zerkleinerten Feststoffbestandteile wie auch von der Pumpe angesaugte Luft in den vergleichsweise großen Hohlraum des Laufrads eindringen und so zu Vibrationen und daraus resultierenden Strömungsgeräuschen führen. Derartige Hohlräume ergeben sich bei Einkanallaufrädern rückseitig des Strömungskanales im Inneren des Laufrades und sind üblicherweise zum Axialende des Laufrades, welches dem Saugmund abgewandt ist, geöffnet. Auch im Hinblick auf die Wellendichtung, die das Pumpengehäuse gegenüber der in das Pumpengehäuse geführten Antriebswelle des Laufrads abdichtet, stellen die in dem Hohlraum des Laufrads befindlichen Feststoffpartikel ein Problem dar, da sie, wenn sie in diese Wellendichtung geraten, deren Funktionseigenschaften und Kühlung ggf. negativ beeinflussen können.It is customary to use submersible pumps for pumping off solids mixed with wastewater. These pumps are usually equipped with a single-channel or a multi-channel impeller for conveying the waste water. Such a submersible pump is for example off EP 1 300 594 B1 known. The pump described therein has on the input side of its impeller in the region of the suction mouth a cutting device which comminutes the solids contained in the wastewater to be pumped in order to prevent blocking of the pump impeller. In general, the sewage pumping proves to be unproblematic with this pump, but also the crushed solid components as well as sucked by the pump air can penetrate into the comparatively large cavity of the impeller and thus lead to vibrations and resulting flow noise. Such cavities arise at Einkanallaufrädern back of the flow channel in the interior of the impeller and are usually open to the axial end of the impeller, which faces away from the suction. With regard to the shaft seal, which seals the pump housing with respect to the drive shaft of the impeller guided in the pump housing, the solid particles located in the cavity of the impeller are a problem because, when they get into this shaft seal, their functional properties and cooling possibly can affect negatively.

Um zu verhindern, dass Feststoffpartikel in eine Dichtung zwischen dem sich drehenden Laufrad und einem feststehenden Teil des Pumpengehäuses geraten wird in WO 2005/038260 A1 vorgeschlagen, in einem anströmseitig der Dichtung ausgebildeten Hohlraum zwischen einer ansaugseitig angeordneten Deckplatte eines Laufrads und einer davor angeordneten Bodenplatte des Gehäuses eines Kreiselpumpe an der dem Laufrad zugewandten Seite der Bodenplatte eine spiralförmige Nut auszubilden, um auf diese Seiten einen Fluidstrom mit darin enthaltenen Feststoffpartikeln von der Dichtung wegzuleiten.In order to prevent solid particles from getting into a seal between the rotating impeller and a stationary part of the pump housing WO 2005/038260 A1 proposed, in a cavity formed on the inlet side of the seal between a suction side disposed cover plate of an impeller and a bottom plate arranged in front of the housing of a centrifugal pump on the impeller side facing the bottom plate form a spiral groove to these sides a fluid flow with solid particles contained therein of the To divert the seal.

Vor diesem Hintergrund liegt der Erfindung die Aufgabe zugrunde, eine verbesserte Pumpe der oben genannten Art zu schaffen, bei der Laufradschwingungen und eine damit verbundene Geräuschentwicklung zumindest verringert und vorzugsweise verhindert werden und bei der die das Pumpengehäuse abdichtende Wellendichtung vor in dem Laufrad befindlichen Feststoffteilchen geschützt wird.Against this background, the invention has the object to provide an improved pump of the above type, are at least reduced in the impeller vibrations and associated noise and preferably prevented and in which the pump housing sealing shaft seal is protected from particulate located in the impeller ,

Gelöst wird diese Aufgabe durch eine Tauchpumpe mit den in Anspruch 1 angegebenen Merkmalen. Vorteilhafte Weiterbildungen dieser Tauchpumpe ergeben sich aus den Unteransprüchen, der nachfolgenden Beschreibung sowie der Zeichnung. Hierbei können gemäß der Erfindung die in den Unteransprüchen angegebenen Merkmale jeweils für sich aber auch in Kombination die erfindungsgemäße Lösung gemäß Anspruch 1 weiter ausgestalten.This object is achieved by a submersible pump having the features specified in claim 1. Advantageous developments of this submersible pump will become apparent from the dependent claims, the following description and the drawings. Here, according to the invention, the features specified in the dependent claims in each case but also in combination, the inventive solution according to claim 1 further develop.

Die erfindungsgemäße Tauchpumpe weist ein in einem Pumpengehäuse angeordnetes Laufrad, insbesondere ein Einkanallaufrad mit einem Hohlraum im Innern auf. Das Laufrad kann jedoch alle bei Tauchpumpen üblichen Laufradformen aufweisen. Die Tauchpumpe ist mit einer Dichtung ausgestattet, die das Laufrad gegenüber einem feststehenden Teil des Pumpengehäuses abdichtet. Diese Dichtung verhindert insbesondere ein Eindringen von Feststoffen und Verunreinigungen in zumindest einen im Innern des Laufrads, außerhalb eines Strömungskanal gelegenen Hohlraums. Diese Dichtung weist einen laufradseitig angeordneten Dichtring auf, der in einen pumpengehäuseseitig angeordneten zweiten äußeren Dichtring eingreift. Der laufradseitige Dichtring ist fest mit dem Laufrad verbunden und rotiert demzufolge mit dem sich drehenden Laufrad mit. Der pumpengehäuseseitig angeordnete Dichtring ist drehfest in dem Pumpengehäuse festgelegt. Zusammen bilden die beiden verwendeten Dichtringe eine Radialdichtung, die bevorzugt im Bereich des Außenumfangs des Laufrads angeordnet ist und das Laufrad, und insbesondere dessen Hohlräume gegenüber dem flüssigkeitsdurchströmten Innenraum des Pumpengehäuses abdichtet.The submersible pump according to the invention has an impeller arranged in a pump housing, in particular a single-channel impeller with a cavity in the interior. However, the impeller may have all the usual impeller types impeller shapes. The submersible pump is equipped with a seal that seals the impeller against a fixed part of the pump housing. In particular, this seal prevents ingress of solids and contaminants into at least one cavity located in the interior of the impeller, outside a flow channel. This seal has a wheel arranged on the side sealing ring, which engages in a pump housing side arranged second outer sealing ring. The impeller-side sealing ring is firmly connected to the impeller and consequently rotates with the rotating impeller. The pump housing side arranged sealing ring is rotatably fixed in the pump housing. Together, the two sealing rings used form a radial seal, which is preferably arranged in the region of the outer circumference of the impeller and the impeller, and in particular its cavities with respect to the liquid-flow-through interior of the pump housing seals.

Der Erfindung liegt die Idee zugrunde, in dem Laufradinneren, d.h. in einem Hohlraum des Laufrads befindliche Feststoffteilchen oder sich dort ansammelnde Luft über die Dichtung in einen Beeich außerhalb des Laufrads abzuführen. Zu diesem Zweck weist der pumpengehäuseseitige Dichtring erfindungsgemäß mindestens eine Ausnehmung zur Abfuhr von Feststoffteilchen auf. Um die grundsätzlichen Dichtungseigenschaften der Dichtung möglichst wenig zu beeinflussen, ist an diesem Dichtring bevorzugt lediglich eine Ausnehmung ausgebildet, ggf. kann dieser Dichtring aber auch mehrere Ausnehmungen aufweisen. Um die Feststoffteilchen über die Dichtung in einen Bereich außerhalb des Laufrads leiten zu können, ist der zwischen dem laufradseitig angeordneten Dichtring und dem im Wesentlichen daran anliegenden pumpengehäuseseitigen Dichtring befindliche Spalt zweckmäßigerweise derart dimensioniert und/oder ausgestaltet, dass Feststoffteilchen in diesen Spalt eindringen können und dann an dem pumpengehäuseseitig angeordneten äußeren Dichtring ausgebildeten Ausnehmung aus der Dichtung in den daran angrenzenden flüssigkeitsdurchströmten Hohlraum des Pumpengehäuses austreten können. Weiter vorteilhaft weist der Spalt eine Ausgestaltung und Dimensionierung auf, die es einerseits erlaubt, Luft über den Spalt aus dem Laufradinneren abzuführen, andererseits aber ein Eindringen von Feststoffen in den Hohlraum des Laufrades verhindern kann.The invention is based on the idea that in the impeller interior, i. In a cavity of the impeller located particulate matter or accumulating there air through the seal in a Beeich outside the impeller to dissipate. For this purpose, the pump housing-side sealing ring according to the invention at least one recess for the removal of solid particles. In order to influence the basic sealing properties of the seal as little as possible, only one recess is preferably formed on this sealing ring, if necessary, this sealing ring can also have a plurality of recesses. In order to be able to guide the solid particles via the seal into a region outside the impeller, the gap located between the impeller-side sealing ring and the substantially adjacent pumping-side sealing ring is expediently dimensioned and / or configured such that solid particles can penetrate into this gap and then on the pump housing side arranged outer sealing ring formed recess can escape from the seal in the adjoining liquid-flowed cavity of the pump housing. Further advantageously, the gap on a design and dimensioning, which on the one hand allows to dissipate air through the gap from the impeller interior, on the other hand, however, can prevent the penetration of solids into the cavity of the impeller.

Indem im Laufradinneren, d.h. sich in einem Hohlraum befindliche Feststoffteilchen und Luft über die Dichtung aus dem Laufrad in einen das Laufrad umgebenden Pumpengehäuseabschnitt geschafft werden, können sie nicht mehr die Laufruhe des Laufrads beeinflussen. Des Weiteren wird durch die Reduzierung des Feststoffanteils in der Flüssigkeit die Gefahr verringert, dass Feststoffteilchen in eine üblicherweise zur flüssigkeitsdichten Durchführung der Antriebswelle des Laufrads in das Pumpengehäuse vorgesehene Wellendichtung eindringen können.By in the impeller interior, ie located in a cavity located particulate matter and air through the seal from the impeller in a surrounding the impeller pump housing section are created, they can no longer affect the smoothness of the impeller. Furthermore, the reduction of the solids content in the liquid reduces the risk that solid particles in a usually for liquid-tight implementation of the drive shaft of the impeller can penetrate into the pump housing provided shaft seal.

Um die in dem Spalt zwischen dem laufradseitigen Dichtring und dem pumpengehäuseseitigen Dichtring befindlichen Feststoffteilchen durch die Dichtung und in diesem Zusammenhang besonders vorteilhaft zu der an dem äußeren Dichtring ausgebildeten Ausnehmung leiten zu können, weist der laufradseitige Dichtring an seiner Außenseite zumindest einen Mitnehmer zum Transport von Feststoffteilchen auf. Solche Mitnehmer können beispielsweise über eine reliefartige Topografie der äußeren Umfangsfläche des laufradseitigen Dichtrings erzeugt werden, bei der Vorsprünge und/oder Vertiefungen in dem Dichtungsspalt befindliche Feststoffteilchen bei der Rotation des laufradseitigen Dichtrings mitnehmen und zu der an dem pumpengehäuseseitigen Dichtring ausgebildeten Ausnehmung bewegen, wo sie an die Umgebung der Dichtung abgegeben werden.In order to be able to guide the solid particles located in the gap between the impeller-side sealing ring and the pump-housing-side sealing ring through the seal and in this connection to the recess formed on the outer sealing ring, the impeller-side sealing ring has on its outer side at least one driver for transporting solid particles on. Such drivers can be generated for example via a relief-like topography of the outer peripheral surface of the impeller-side sealing ring, take in the projections and / or depressions in the sealing gap befindliches solid particles in the rotation of the impeller-side sealing ring and move to the recess formed on the pump housing side sealing ring, where they the environment of the seal are delivered.

Bei der erfindungsgemäßen Tauchpumpe handelt es sich bevorzugt um eine vertikal aufgestellte Pumpe, bei der der Ansaugbereich im Bereich eines unteren Endes der Pumpe unterhalb eines vertikal gelagerten Laufrads angeordnet ist. Bei diesen Pumpen kann sich in einem oberen Laufradbereich insbesondere in einem Hohlraum des Laufrads ggf. von der Tauchpumpe mitangesaugte Luft sammeln. Insofern erweist es sich als zweckmäßig, die das Laufrad gegenüber einem feststehenden Teil des Pumpengehäuses abdichtende Dichtung genau in diesem oberen Bereich des Laufrads anzuordnen, damit die in dem Laufrad befindliche Luft über die Dichtung direkt aus dem Laufrad entweichen kann. So sieht eine vorteilhafte Weiterbildung der erfindungsgemäßen Tauchpumpe vor, die das Laufrad bzw. dessen Hohlraum gegenüber einem feststehenden Teil des Pumpengehäuses abdichtende Dichtung an einem axial von dem Saugmund der Pumpe beabstandeten Ende des Laufrads anzuordnen.The submersible pump according to the invention is preferably a vertically mounted pump, in which the intake region is arranged in the region of a lower end of the pump below a vertically mounted impeller. With these pumps, air which has been sucked in by the submersible pump may possibly collect in an upper impeller region, in particular in a cavity of the impeller. In this respect, it proves useful to arrange the impeller sealing against a fixed part of the pump housing seal exactly in this upper region of the impeller, so that the air in the impeller can escape through the seal directly from the impeller. Thus, an advantageous development of the submersible pump according to the invention, which arrange the impeller or its cavity relative to a fixed part of the pump housing sealing seal on an axially spaced from the suction mouth of the pump end of the impeller.

Gemäß einer weiteren vorteilhaften Weiterbildung kann sowohl der laufradseitige als auch der pumpengehäuseseitig angeordnete Dichtring eine hohlzylindrische Form aufweisen. Demzufolge können als Dichtringe jeweils Dichtringe mit einer Hülsenform verwendet werden. Hierbei kann der pumpengehäuseseitige Dichtungsring den an dem Laufrad angebrachten Dichtring an deren Außenseite bzw. umfangseitig in axialer Richtung in einem vergleichsweise großen Bereich überlappen, wodurch sich entsprechend gute Dichtungseigenschaften verwirklichen lassen. D.h. der eine Dichtring , vorzugsweise der pumpengehäuseseitige Dichtring umgibt den anderen Dichtring umfänglich.According to a further advantageous development, both the impeller-side and the pump housing side arranged sealing ring may have a hollow cylindrical shape. As a result, sealing rings with a sleeve shape can be used as sealing rings. Here, the pump-housing-side seal ring overlap the attached to the impeller seal on the outside or circumferentially in the axial direction in a relatively large area, which can be realized correspondingly good sealing properties. That a sealing ring, preferably the pump housing side sealing ring surrounds the other sealing ring circumferentially.

Wie bereits angemerkt worden ist, können ein an der Außen- bzw. Umfangseite des laufradseitigen Dichtrings ausgebildeter Mitnehmer oder mehrere dort vorgesehene Mitnehmer zum Transport von Feststoffteilchen von einer an der äußeren Mantelfläche dieses Dichtrings ausgebildeten reliefartigen Oberflächenstruktur gebildet werden. In diesem Zusammenhang ist bevorzugt vorgesehen, dass der laufradseitige Dichtring an seinem Außenumfang mindestens eine Vertiefung aufweist. Besonders vorteilhaft sind mehrere Vertiefungen gleichmäßig um den Umfang des Dichtrings verteilt ausgebildet. Die Verwendung von muldenförmigen Vertiefungen zum Transport von Feststoffteilchen ist in sofern vorteilhaft, als diese Ausgestaltung der Mitnehmer keinen Einfluss auf die übrige Spaltbreite zwischen dem laufradseitigen Dichtring und dem pumpengehäuseseitigen Dichtring hat, da an dem laufradseitigen Dichtring keine radial nach außen ragenden Erhöhungen benötigt werden. Demzufolge kann der Spalt im übrigen schmal dimensioniert werden.As has already been noted, a driver formed on the outer or peripheral side of the impeller-side sealing ring or a plurality of entrainment members provided there for transporting solid particles may be formed by a relief-like surface structure formed on the outer circumferential surface of this sealing ring. In this context, it is preferably provided that the impeller-side sealing ring has at least one recess on its outer circumference. Particularly advantageously, a plurality of depressions are formed uniformly distributed around the circumference of the sealing ring. The use of trough-shaped depressions for transporting solid particles is advantageous in so far as this embodiment of the driver has no effect on the remaining gap width between the impeller-side sealing ring and the pump-housing-side sealing ring, since no radially outwardly projecting elevations are required on the impeller-side sealing ring. As a result, the gap can otherwise be made narrow.

Die an dem laufradseitigen Dichtring ausgebildeten Vertiefungen dienen zur Aufnahme der Feststoffteilchen. Um diese Feststoffteilchen aus der Dichtung heraustransportieren zu können, erweist es sich als besonders zweckmäßig, wenn die an dem pumpengehäuseseitigen Dichtring ausgebildete Ausnehmung derart angeordnet und ausgebildet ist, dass sie die zumindest eine Vertiefung der laufradseitigen Dichtrings vollständig freigibt. D.h., wenn sich die Vertiefung des laufradseitigen Dichtringes an derselben Winkelposition wie die Ausnehmung befindet, liegen Ausnehmung und Vertiefung übereinander. Dementsprechend ist eine Ausgestaltung vorgesehen, bei der durch Drehung des laufradseitigen Dichtrings relativ zu dem pumpengehäuseseitigen Dichtring die an dem laufradseitigen Dichtring ausgebildete Vertiefung bzw. Vertiefungen in eine Stellung bewegt werden, in der sie aufgrund der an dem pumpengehäuseseitigen Dichtring ausgebildeten Ausnehmung nicht von diesem Dichtring abgedeckt werden. In einer Vertiefung befindliche Feststoffteilchen können dann an dieser Stelle aus der Vertiefung in das Pumpengehäuse herausfallen.The recesses formed on the impeller-side sealing ring serve to receive the solid particles. To make these solid particles out To be able to transport out of the seal, it proves to be particularly useful if the recess formed on the pump-housing-side sealing ring is arranged and formed so that it completely releases the at least one recess of the impeller-side sealing ring. That is, when the recess of the impeller-side sealing ring is located at the same angular position as the recess, recess and recess lie one above the other. Accordingly, an embodiment is provided in which, by rotation of the impeller side sealing ring relative to the pump housing side sealing ring formed on the impeller side sealing recess or depressions are moved to a position in which they are not covered by this seal due to the recess formed on the pump housing side sealing ring become. Solid particles located in a depression can then fall out of the depression into the pump housing at this point.

Zum Abtransport der Feststoffteilchen aus dem Pumpengehäuse ist die an dem pumpengehäuseseitigen Dichtring ausgebildete Ausnehmung zweckmäßigerweise in einem flüssigkeitsdurchströmten Bereich des Pumpengehäuses angeordnet, der mit dem Druckstutzen der Pumpe strömungsverbunden ist. Hierbei ist bevorzugt vorgesehen, dass die Ausnehmung an einem Abschnitt des Dichtrings angeordnet ist, der einem Niederdruckbereich des Pumpengehäuses zugewandt ist. In diesem Zusammenhang ist unter einem Niederdruckbereich des Pumpengehäuses ein solcher flüssigkeitsdurchströmter Bereich im Auslaufkrümmer des Pumpengehäuses zu verstehen, in dem ein geringerer Flüssigkeitsdruck als an dem Druckstutzen, d.h. dem Austrittsquerschnitt der Pumpe vorliegt.For removal of the solid particles from the pump housing, the recess formed on the pump-housing-side sealing ring is expediently arranged in a region of the pump housing through which fluid flows, which is flow-connected to the pressure connection of the pump. Here, it is preferably provided that the recess is arranged on a portion of the sealing ring, which faces a low-pressure region of the pump housing. In this context, a low-pressure region of the pump housing means such a fluid-flow area in the outlet manifold of the pump housing in which a lower fluid pressure than at the pressure port, i. the outlet cross-section of the pump is present.

Die an dem pumpengehäuseseitigen Dichtring ausgebildete Ausnehmung ist bevorzugt an einem axialen Außenrand des Dichtrings ausgebildet. Typischerweise handelt es sich bei diesem Außenrand des Dichtrings um den Rand, der dem Laufrad der Pumpe zugewandt angeordnet ist. Die Ausnehmung ist also vorzugsweise in dem Bereich des pumpengehäuseseitigen Dichtrings angeordnet, der am weitesten von dem freien Ende des darin eingreifenden laufradseitigen Dichtrings entfernt ist.The recess formed on the pump-housing-side sealing ring is preferably formed on an axial outer edge of the sealing ring. Typically, this outer edge of the sealing ring around the edge, which faces the impeller of the pump. The recess is therefore preferably arranged in the region of the pump-housing-side sealing ring which is the farthest away from the free end of the wheel-side sealing ring engaging therein.

Besonders vorteilhaft kann ein die Ausnehmung begrenzender Rand zumindest abschnittsweise eine Schneide bilden. D.h., zumindest ein Randabschnitt weist beispielsweise durch einen entsprechenden Anschliff eine solche sich verjüngende Geometrie auf, die diesem Randabschnitt eine gewisse Schärfe verleiht. Dieser geschärfte Randbereich dient dazu, die durch die Dichtung zu der Ausnehmung des pumpengehäuseseitigen Dichtrings transportierten Feststoffteilchen vor der Freigabe in das Pumpengehäuse zu zerkleinern.Particularly advantageously, an edge delimiting the recess can form a cutting edge at least in sections. In other words, at least one edge section has such a tapering geometry, for example, by a corresponding bevel, which gives this edge section a certain sharpness. This sharpened edge region serves to shred the transported through the seal to the recess of the pump housing side sealing ring solid particles before release into the pump housing.

Zweckmäßigerweise ist die an dem die Ausnehmung begrenzenden Rand ausgebildete Schneide an einem der Drehrichtung des Laufrads zugewandten Randabschnitt der Ausnehmung ausgebildet. Dies ist in sofern sinnvoll, als bei der Drehung des Laufrads die von dem an diesem Laufrad befestigten Dichtring transportierten Feststoffteilchen direkt zu der Schneide, d.h. deren Schneidkante in Schneidrichtung hin bewegt werden.Conveniently, the cutting edge formed on the edge defining the recess is formed on an edge portion of the recess facing the direction of rotation of the impeller. This is meaningful insofar as, during the rotation of the impeller, the solid particles carried by the sealing ring attached to this impeller are transported directly to the cutting edge, i. whose cutting edge are moved in the cutting direction.

Bevorzugt ist der die Schneide bildende Abschnitt bezogen auf die äu-βere Stirnseite des Dichtrings in einem Winkel von 15 - 90° ausgerichtet. Besonders vorteilhaft ist der Winkel, den die Schneide mit der äußeren Stirnseite des pumpengehäuseseitigen Dichtrings bildet, größer als 35°, da sich gezeigt hat, dass bei kleineren Winkeln die Gefahr besteht, dass sich zu der Schneide geführte Feststoffteilchen an der Schneide ablagern können, ohne wie gewünscht geschnitten zu werden.Preferably, the section forming the cutting edge is oriented at an angle of 15-90 ° relative to the outer side of the sealing ring. Particularly advantageously, the angle formed by the cutting edge with the outer end face of the pump housing-side sealing ring, greater than 35 °, since it has been shown that at smaller angles there is a risk that can be deposited on the cutting edge of solid particles on the cutting edge, without to be cut as desired.

Auch ein der Schneide gegenüberliegend angeordneter Randabschnitt der Ausnehmung kann bezogen auf die äußere Stirnseite des Dichtrings abgeschrägt sein, so dass die Ausnehmung eine im Wesentlichen keil oder trapezförmige Außenkontur aufweisen kann. Hierbei kann der der Schneide gegenüberliegend angeordnete Randabschnitt bezogen auf die äußere Stirnseite des Dichtrings vorteilhaft ebenfalls in einem Winkel von 15 - 90° ausgerichtet sein, wobei allerdings vorzugsweise vorgesehen ist, dass dieser Winkel größer als der Winkel zwischen der Schneide und der äußeren Stirnseite des Dichtrings ist.An edge portion of the recess arranged opposite the cutting edge can also be chamfered with respect to the outer end face of the sealing ring, so that the recess can have a substantially wedge-shaped or trapezoidal outer contour. Here, the cutting edge of the oppositely arranged edge portion relative to the outer end side of the sealing ring advantageously also be aligned at an angle of 15-90 °, although it is preferably provided that this angle is greater than the angle between the cutting edge and the outer end face of the sealing ring is.

Nachfolgend ist die Erfindung anhand eines in den Zeichnungen dargestellten Ausführungsbeispiels näher erläutert. In den Zeichnungen zeigt:

Fig. 1
eine Tauchpumpe in einer Seitenansicht,
Fig. 2
ein Pumpengehäuse der Tauchpumpe nach Fig. 1 in perspektivischer Darstellung,
Fig. 3 ein
Laufrad der Tauchpumpe nach Fig.1 in einer Seitenansicht,
Fig.
4 das Laufrad nach Fig. 3 mit einem daran angeordneten pumpengehäuseseitigen Dichtring in perspektivischer Darstellung,
Fig. 5 in
einem Längsschnitt einen Abschnitt des Pumpengehäuses nach Fig. 2 und
Fig. 6
schematisch in einem Querschnitt das Pumpengehäuse nach Fig. 2.
The invention is explained in more detail with reference to an embodiment shown in the drawings. In the drawings shows:
Fig. 1
a submersible pump in a side view,
Fig. 2
a pump housing of the submersible pump Fig. 1 in perspective,
Fig. 3 a
Impeller of the submersible pump Fig.1 in a side view,
FIG.
4 the impeller after Fig. 3 with a pump housing-side sealing ring arranged thereon in perspective view,
Fig. 5 in
a longitudinal section of a section of the pump housing after Fig. 2 and
Fig. 6
schematically in a cross section of the pump housing after Fig. 2 ,

Bei der in Fig. 1 dargestellten Tauchpumpe handelt es sich um eine vertikal aufzustellende Tauchpumpe. Diese Tauchpumpe weist in üblicher Weise ein zweiteiliges Gehäuse mit einem Pumpengehäuse 2 und einem Motorgehäuse 4 auf, das oberhalb des Pumpengehäuses 2 angeordnet ist. An dem unteren Ende des Pumpengehäuses 2 sind ringförmig mehrere Standfüße 6 der Tauchpumpe angeordnet, die einen Ansaugbereich der Tauchpumpe umringen.At the in Fig. 1 shown submersible is a vertical submersible pump. This submersible pump has in common Weise a two-part housing with a pump housing 2 and a motor housing 4, which is arranged above the pump housing 2. At the lower end of the pump housing 2 a plurality of feet 6 of the submersible pump are arranged annularly, which surround a suction of the submersible pump.

In dem Pumpengehäuse 2 ist ein Laufrad 8 in einer Drehrichtung B um eine Längsachse A des Pumpengehäuses 2 drehbar gelagert (Fig. 5). Bei dem Laufrad 8 handelt es sich um ein so genanntes Einkanallaufrad mit einem Laufradkanal 10, der sich von einem an einem Axialende des Laufrades 8 gelegenen Saugmund 12 zum Umfang des Laufrades erstreckt. Rückseitig des Laufradkanales 10, d.h. getrennt von diesem ist im Inneren des Laufrades 8 ein Hohlraum bzw. eine Aushöhlung 14 ausgebildet, welche zu der dem Saugmund 12 abgewandten Axialseite des Laufrades 8 geöffnet ist. In dem Pumpengehäuse 2 ist radial außenseitig des Laufrads 8 ein flüssigkeitsführender Auslaufkrümmer 16 ausgebildet (Fig. 6), der in einem Druckstutzen 18 des Pumpengehäuses 2 mündet.In the pump housing 2, an impeller 8 is rotatably mounted in a direction of rotation B about a longitudinal axis A of the pump housing 2 ( Fig. 5 ). The impeller 8 is a so-called single-channel impeller having an impeller passage 10 extending from a suction port 12 located at an axial end of the impeller 8 to the circumference of the impeller. On the rear side of the impeller duct 10, ie separated from this, a cavity or cavity 14 is formed in the interior of the impeller 8, which is open to the axial side of the impeller 8 remote from the suction mouth 12. In the pump housing 2, a fluid-carrying outlet manifold 16 is formed radially outside the impeller 8 ( Fig. 6 ), which opens into a pressure port 18 of the pump housing 2.

Das Laufrad 8 ist in dem Pumpengehäuse 2 gegenüber einem dort feststehenden Bauteil 20 mittels einer Dichtung 22 abgedichtet. Die Dichtung 22 wird von einem an dem Laufrad 8 ausgebildeten Dichtring 24 und von einem an dem Bauteil 20 ausgebildeten Dichtring 26 gebildet, wobei der laufradseitige Dichtring 24 in den an dem Bauteil 20 ausgebildeten Dichtring 26 eingreift. Der Dichtring 24 ist an dem von dem Saugmund 12 abgewandten stirnseitigen Ende des Laufrads 8 angeordnet, während der Dichtring 26 an dem Bauteil 20 des Pumpengehäuses an einer dem Laufrad 8 zugewandten Seite angeordnet ist. Beide Dichtringe 24 und 26 sind im Wesentlichen hohlzylindrisch ausgebildet, welche konzentrisch zueinander angeordnet sind.The impeller 8 is sealed in the pump housing 2 with respect to a component 20 fixed there by means of a seal 22. The seal 22 is formed by a sealing ring 24 formed on the impeller 8 and by a sealing ring 26 formed on the component 20, the impeller-side sealing ring 24 engaging in the sealing ring 26 formed on the component 20. The sealing ring 24 is arranged on the side facing away from the suction mouth 12 front end of the impeller 8, while the sealing ring 26 is disposed on the component 20 of the pump housing on a side facing the impeller 8. Both sealing rings 24 and 26 are substantially hollow cylindrical, which are arranged concentrically with each other.

An dem Dichtring 26 ist eine Ausnehmung 28 ausgebildet, an der der ansonsten von dem Dichtring 26 umhüllte laufradseitige Dichtring 24 freiliegt. Die Ausnehmung 28 ist in ihrer Winkellage bezüglich der Längsachse A in einem von dem von dem Druckstutzen 18 beabstandeten Niederdruckbereich des Auslaufkrümmer 16 angeordnet (Fig. 6) und erstreckt sich ausgehend von einer dem Laufrad 8 zugewandten Stirnseite des Dichtrings 26 in Richtung des Bauteils 20, wobei sich die Breite der Ausnehmung 28 in Richtung des Bauteils 20 trapezförmig verjüngt. Hierzu sind die an die Stirnseite des Dichtrings 26 angrenzenden und einander gegenüberliegenden Seitenränder 30 und 32 der Ausnehmung 28 jeweils bezogen auf die Stirnseite des Dichtrings 28 abgeschrägt ausgebildet. Hierbei ist der der Drehrichtung B des Laufrads 8 zugewandte Seitenrand 30 bezogen auf die Stirnseite des Dichtrings 26 in einem Winkel von ungefähr 45° abgewinkelt und der dem Seitenrand 30 gegenüberliegende Seitenrand 32 bezogen auf die Stirnseite des Dichtrings 26 in einem Winkel von etwa 60° abgewinkelt. Wie insbesondere aus Fig. 4 deutlich wird, verjüngt sich die Wandstärke des Dichtrings 26 kontinuierlich im Bereich des Seitenrands 30 und bildet so eine Schneide 30, deren Funktion im weiteren Verlauf näher erläutert wird.On the sealing ring 26, a recess 28 is formed, on which the otherwise surrounded by the sealing ring 26 impeller-side sealing ring 24 is exposed. The recess 28 is arranged in its angular position with respect to the longitudinal axis A in a spaced from the pressure port 18 low-pressure region of the outlet manifold 16 ( Fig. 6 ) and extends from an end face of the sealing ring 26 facing the impeller 8 in the direction of the component 20, wherein the width of the recess 28 tapers trapezoidally in the direction of the component 20. For this purpose, the adjacent to the end face of the sealing ring 26 and opposite side edges 30 and 32 of the recess 28 are each beveled with respect to the end face of the sealing ring 28. Here, the direction of rotation B of the impeller 8 facing side edge 30 is angled relative to the end face of the sealing ring 26 at an angle of approximately 45 ° and the side edge 30 opposite side edge 32 angled relative to the end face of the sealing ring 26 at an angle of about 60 ° , As in particular from Fig. 4 becomes clear, the wall thickness of the sealing ring 26 tapers continuously in the region of the side edge 30 and thus forms a cutting edge 30, whose function will be explained in more detail below.

An der äußeren Umfangsfläche des laufradseitigen Dichtrings 24 sind ausgehend von dem stirnseitigen Ende des Dichtrings 24 vier muldenförmige Vertiefungen 34 ausgebildet. Diese Vertiefungen 34 sind gleichmäßig voneinander beabstandet über den Umfang des Dichtrings 24 verteilt. Die Vertiefungen 34 dienen zusammen mit der an dem Dichtring 26 ausgebildeten Ausnehmung 28 dazu, ggf. in der Aushöhlung 14 des Laufrades 8 befindliche Feststoffteilchen, die ansonsten zu unerwünschten Laufradvibrationen und damit verbundenen Geräuschen führen würden, über die Dichtung 22 in den Auslaufkrümmer 16 abzuführen. Hierbei sind die Vertiefungen 34 zur Aufnahme dieser Feststoffteilchen vorgesehen. Des Weiteren dienen die Vertiefungen 34 zum Transport der Feststoffteilchen zu der Ausnehmung 28 des Dichtrings 26, wo die Vertiefungen 34 nicht mehr von dem Dichtring 26 überdeckt sind, so dass in den Vertiefungen 34 befindliche Feststoffteilchen in den an die Ausnehmung 28 angrenzenden Niederdruckbereich des Auslaufkrümmer 16 abgelassen werden können. Durch die Laufraddrehung werden aus den Vertiefungen 34 im Bereich der Ausnehmung 28 herausragende Feststoffteilchen, beispielsweise Feststofffasern gegen die Schneide 30 gedrückt und auf diese Weise zerkleinert.On the outer peripheral surface of the impeller-side sealing ring 24, four trough-shaped recesses 34 are formed starting from the front end of the sealing ring 24. These recesses 34 are uniformly spaced from each other distributed over the circumference of the sealing ring 24. The depressions 34, together with the recess 28 formed on the sealing ring 26, serve to remove solid particles which may otherwise be present in the cavity 14 of the impeller 8, which would otherwise lead to undesired impeller vibrations and associated noises, via the seal 22 into the outlet manifold 16. Here, the recesses 34 are provided for receiving these solid particles. Furthermore, the recesses 34 serve to transport the solid particles to the recess 28 of the sealing ring 26, where the recesses 34 are no longer covered by the sealing ring 26 so that in the recesses 34 located particulate matter can be discharged into the adjacent to the recess 28 low pressure region of the outlet manifold 16. Due to the impeller rotation, protruding solid particles, for example solid fibers, against the cutting edge 30 are pressed out of the recesses 34 in the region of the recess 28 and are comminuted in this way.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

22
- Pumpengehäuse- Pump housing
44
- Motorgehäuse- Motor housing
66
- Standfuß- Stand
88th
- Laufrad- Wheel
1010
- Kanal- Channel
1212
- Saugmund- Suction mouth
1414
- Aushöhlung- Excavation
1616
- Auslaufkrümmer- outlet manifold
1818
- Druckstutzen- discharge nozzle
2020
- Bauteil- component
2222
- Dichtung- Poetry
2424
- Dichtring- sealing ring
2626
- Dichtring- sealing ring
2828
- Ausnehmung- recess
3030
- Seitenrand, Schneide- margin, cutting edge
3232
- Seitenrand- margin
3434
- Vertiefung- Deepening
AA
- Längsachse- longitudinal axis
BB
- Drehrichtung- direction of rotation

Claims (11)

  1. A submersible pump with an impeller (8) arranged in a pump housing (2) and with a seal (22) which seals the impeller (8) with respect to a stationary part of the pump housing (2), wherein the seal (22) comprises a sealing ring (24) which is arranged on the impeller side and which engages into a second sealing ring (26) arranged on the pump housing side, characterised in that the pump-housing-side sealing ring (26) comprises at least one recess (28) for leading away solid matter particles and that the impeller-side sealing ring (24) on its outer side comprises at least one catcher for the transport of solid matter particles.
  2. A submersible pump according to claim 1, characterised in that the seal (22) is arranged at an end of the impeller (8) which is axially distanced to a suction port (12) of the pump.
  3. A submersible pump according to one of the preceding claims, characterised in that the sealing ring (24, 26) arranged on the impeller side as well as the sealing ring arranged on the pump housing side have a hollow-cylindrical shape.
  4. A submersible pump according to one of the preceding claims, characterised in that the impeller-side sealing ring (24) on its outer periphery comprises at least one depression (34).
  5. A submersible pump according to claim 4, characterised in that the recess (28) of the pump-housing-side sealing ring (26) is arranged and designed such that it completely releases the at least one depression (34) of the impeller-side sealing ring (24).
  6. A submersible pump according to one of the preceding claims, characterised in that the recess (28) is arranged on a section of the sealing ring (26) which faces a low-pressure region of the pump housing (2).
  7. A submersible pump according to one of the preceding claims, characterised in that the recess (28) is formed on an axial outer edge of the sealing ring (26).
  8. A submersible pump according to one of the preceding claims, characterised in that an edge delimiting the recess (28), at least in sections forms a cutter (30).
  9. A submersible pump according to claim 8, characterised in that the cutter (30) is formed on an edge section of the recess (28) which faces the rotation direction (B) of the impeller (8).
  10. A submersible pump according to one of the claims 8 or 9, characterised in that the section forming the cutter (30) is aligned at an angle of 15 to 90° with respect to the outer end-side of the sealing ring (26).
  11. A submersible pump according to one of the claims 8 to 10, characterised in that an edge section of the recess (28) which is arranged lying opposite the cutter (30) is aligned at an angle of 15 to 90° with respect to the outer end-side of the sealing ring (26).
EP09016147.2A 2009-12-30 2009-12-30 Immersion pump Active EP2348220B1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP09016147.2A EP2348220B1 (en) 2009-12-30 2009-12-30 Immersion pump
PCT/EP2010/007100 WO2011079892A1 (en) 2009-12-30 2010-11-23 Submersible pump
US13/519,983 US9234523B2 (en) 2009-12-30 2010-11-23 Submersible pump
RU2012132482/06A RU2534193C2 (en) 2009-12-30 2010-11-23 Downhole pump
CN201080060111.1A CN102686886B (en) 2009-12-30 2010-11-23 Submersible pump

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP09016147.2A EP2348220B1 (en) 2009-12-30 2009-12-30 Immersion pump

Publications (2)

Publication Number Publication Date
EP2348220A1 EP2348220A1 (en) 2011-07-27
EP2348220B1 true EP2348220B1 (en) 2015-07-08

Family

ID=42097339

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09016147.2A Active EP2348220B1 (en) 2009-12-30 2009-12-30 Immersion pump

Country Status (5)

Country Link
US (1) US9234523B2 (en)
EP (1) EP2348220B1 (en)
CN (1) CN102686886B (en)
RU (1) RU2534193C2 (en)
WO (1) WO2011079892A1 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE536067C2 (en) * 2011-10-06 2013-04-23 Xylem Ip Holdings Llc Pump for pumping liquid containing solids
DE102011054320A1 (en) * 2011-10-07 2013-04-11 Uwe Würdig Centrifugal pump and arrangement for gap sealing
EP2660473B1 (en) 2012-05-04 2016-11-23 Grundfos Holding A/S Waste water pump
EP3309404B1 (en) * 2016-10-14 2022-03-02 Grundfos Holding A/S Waste water pump
USD946627S1 (en) * 2020-07-09 2022-03-22 Forcome (Qingdao) Co., Ltd. Electrical water pump
CN113803265A (en) * 2021-09-02 2021-12-17 安徽凯特泵业有限公司 Long-shaft submerged pump with good stability

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
US3881840A (en) * 1973-09-05 1975-05-06 Neratoom Centrifugal pump for processing liquids containing abrasive constituents, more particularly, a sand pump or a waste-water pumper
SU1149057A1 (en) * 1983-05-31 1985-04-07 Ленинградский Институт Водного Транспорта Suction dredge
SE469040B (en) * 1991-09-03 1993-05-03 Flygt Ab Itt CENTRIFUGAL PUMP WHEEL FOR PUMP INTENDED TO PUMP WATER SHOES CONTAINING SOLID PARTICLES
AU7697094A (en) * 1993-09-25 1995-04-10 Ksb Aktiengesellschaft Turbo-machine with reduced attrition
GB2310252A (en) * 1996-02-16 1997-08-20 United Utilities Plc Machines with rotors; accumulation prevention
US20040136825A1 (en) * 2001-08-08 2004-07-15 Addie Graeme R. Multiple diverter for reducing wear in a 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
SE530785C2 (en) * 2006-01-23 2008-09-09 Itt Mfg Enterprises Inc Pump for pumping contaminated liquid containing solids

Also Published As

Publication number Publication date
CN102686886A (en) 2012-09-19
RU2534193C2 (en) 2014-11-27
US20130089420A1 (en) 2013-04-11
CN102686886B (en) 2016-03-23
RU2012132482A (en) 2014-02-10
EP2348220A1 (en) 2011-07-27
WO2011079892A1 (en) 2011-07-07
US9234523B2 (en) 2016-01-12

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