EP1840379B1 - Pompe centrifuge dotée d'un rotor de courant libre - Google Patents

Pompe centrifuge dotée d'un rotor de courant libre 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
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
EP07005864A
Other languages
German (de)
English (en)
Other versions
EP1840379A2 (fr
EP1840379A3 (fr
Inventor
Rolf Witzel
Christoph Jäger
Peter Szlama
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
KSB AG
Original Assignee
KSB AG
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Publication date
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Publication of EP1840379A2 publication Critical patent/EP1840379A2/fr
Publication of EP1840379A3 publication Critical patent/EP1840379A3/fr
Application granted granted Critical
Publication of EP1840379B1 publication Critical patent/EP1840379B1/fr
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/44—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.

Landscapes

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

Claims (9)

  1. Pompe centrifuge dotée d'une roue vortex disposé de façon rotative dans un boîtier, dans laquelle un espace sans aubes permettant le passage libre de substances solides et s'étendant en continu avant la roue vortex est disposé entre une paroi du boîtier côté aspiration pourvue d'une ouverture d'aspiration et la roue vortex et la pompe centrifuge est dotée d'un équipement destiné à éviter le décollement de l'écoulement, caractérisée en ce qu'au moins un moyen (10, 17, 20, 26) en une ou plusieurs parties, destiné à influencer l'écoulement, saillant en direction axiale et réduisant localement l'espace sans aubes (7) est disposé en face des aubes de rotor (4) et sur la paroi de boîtier côté aspiration (6) sur un ou plusieurs des rayons radiaux partant de l'ouverture d'aspiration (9, 13, 24, 27).
  2. Pompe centrifuge selon la revendication 1, caractérisée en ce que le moyen destiné à influencer l'écoulement (10, 17, 20, 26) est une nervure (17, 26) s'étendant en direction radiale et saillante en direction axiale.
  3. Pompe centrifuge selon la revendication 1 ou 2, caractérisée en ce qu'un tuyau d'aspiration tubulaire (23, 28) pénètre dans l'espace sans aubes (7).
  4. Pompe centrifuge selon la revendication 1, 2 ou 3, caractérisée en ce que le moyen destiné à influencer l'écoulement (10, 17, 20, 26) s'applique de façon étanche sur le tuyau d'aspiration (23, 28) et/ou sur la paroi de boîtier côté aspiration (6).
  5. Pompe centrifuge selon l'une quelconque des revendications 1 à 4, caractérisée en ce que le moyen destiné à influencer l'écoulement (10, 17, 20, 26) est réalisé comme un composant du tuyau d'aspiration (23, 28).
  6. Pompe centrifuge selon l'une quelconque des revendications 1 à 5, caractérisée en ce que la paroi de boîtier côté aspiration (6) et le moyen destiné à influencer l'écoulement (10, 17, 20, 26) sont réalisés comme des composants d'un couvercle de boîtier (11, 12, 19, 25).
  7. Pompe centrifuge selon la revendication 6, caractérisée en ce qu'un moyen destiné à influencer l'écoulement (10, 17, 20, 26) est disposé sur un rayon radial entre une ouverture d'aspiration (9, 13, 24, 27) et un site de fixation (14, 15, 16) du couvercle de boîtier (11, 12, 19, 25).
  8. Pompe centrifuge selon l'une quelconque des revendications 1 à 7, caractérisée en ce que le moyen destiné à influencer l'écoulement (10, 17, 20, 26) et/ou le tuyau d'aspiration (23, 28) sont fixés de façon démontable.
  9. Pompe centrifuge selon l'une quelconque des revendications 1 à 8, caractérisée en ce que le moyen destiné à influencer l'écoulement (10, 17, 20, 26) pénètre dans la chambre de pression et/ou dans l'ouverture d'aspiration (9, 13, 24, 27) de la pompe.
EP07005864A 2006-03-28 2007-03-22 Pompe centrifuge dotée d'un rotor de courant libre Active EP1840379B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE202006005073U DE202006005073U1 (de) 2006-03-28 2006-03-28 Kreiselpumpe mit Freistromlaufrad

Publications (3)

Publication Number Publication Date
EP1840379A2 EP1840379A2 (fr) 2007-10-03
EP1840379A3 EP1840379A3 (fr) 2007-11-07
EP1840379B1 true EP1840379B1 (fr) 2011-06-22

Family

ID=36600018

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Application Number Title Priority Date Filing Date
EP07005864A Active EP1840379B1 (fr) 2006-03-28 2007-03-22 Pompe centrifuge dotée d'un rotor de courant libre

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

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008016476A1 (de) * 2008-03-31 2009-10-01 BSH Bosch und Siemens Hausgeräte GmbH Hausgerät mit einer Pumpe zur Förderung eines Mediums
DE102008030112A1 (de) 2008-06-27 2009-12-31 Ksb Aktiengesellschaft Kreiselpumpe mit Freistromlaufrad
DE102010052036A1 (de) 2010-11-23 2012-05-24 Ebm-Papst Landshut Gmbh Pumpe zur Förderung von Flüssigkeiten
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 (de) * 1963-10-05 1966-08-15 Schwarze Pumpe Schwarze Pumpe Kreiselpumpe
IT1040087B (it) * 1975-07-25 1979-12-20 Eurodomestici Ind Riunite Pompa di drenaggio autopulente in particolare per macchinelavatrici
DE2714376C3 (de) * 1977-03-31 1980-08-28 Klein, Schanzlin & Becker Ag, 6710 Frankenthal Kreiselpumpe mit offenem Laufrad
MX157817A (es) * 1981-12-08 1988-12-15 Emule Egger & Cie S A Mejoras a bomba rotativa de circulacion libre de fluidos
DE3626754A1 (de) * 1986-08-07 1988-02-11 Klein Schanzlin & Becker Ag Kreiselpumpe mit offenem laufrad
SE9303475L (sv) * 1993-10-22 1994-11-28 Flygt Ab Itt Pumphus för virvelströmspump

Also Published As

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

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