EP1457682B1 - Centrifugal pump - Google Patents

Centrifugal pump Download PDF

Info

Publication number
EP1457682B1
EP1457682B1 EP03027121A EP03027121A EP1457682B1 EP 1457682 B1 EP1457682 B1 EP 1457682B1 EP 03027121 A EP03027121 A EP 03027121A EP 03027121 A EP03027121 A EP 03027121A EP 1457682 B1 EP1457682 B1 EP 1457682B1
Authority
EP
European Patent Office
Prior art keywords
blades
impeller
centrifugal pump
exterior
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.)
Expired - Lifetime
Application number
EP03027121A
Other languages
German (de)
French (fr)
Other versions
EP1457682A1 (en
Inventor
Frank-Hendrik Dr.-Ing. Wurm
Hans-Erhard Prof. Dr.-Ing. Habil Peters
Matthias Faust
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wilo SE
Original Assignee
Wilo AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Wilo AG filed Critical Wilo AG
Publication of EP1457682A1 publication Critical patent/EP1457682A1/en
Application granted granted Critical
Publication of EP1457682B1 publication Critical patent/EP1457682B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/18—Rotors
    • F04D29/22—Rotors specially for centrifugal pumps
    • F04D29/2261—Rotors specially for centrifugal pumps with special measures
    • 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
    • F04D13/04—Units comprising pumps and their driving means the pump being fluid driven
    • F04D13/043—Units comprising pumps and their driving means the pump being fluid driven the pump wheel carrying the fluid driving means
    • 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

Definitions

  • the invention relates to a centrifugal pump with a bladed impeller, the is fed axially on its suction side, the delivery liquid, wherein on the Suction side, the blades covered by an annular coaxial cover disc which forms a gap with the pump housing inner wall through which a part the conveyed liquid flows back as a split flow to the suction side.
  • US 4,854,820 discloses a centrifugal pump whose impeller is a cover disk has, wherein the cover plate on its side facing the housing Flow channels forming, additional blades for conveying the fluid having.
  • the object of the invention is, in centrifugal pumps in particular small design to ensure that the liquid reflux in the gap between the impeller and Housing inner wall leads to the lowest possible losses.
  • the outer blades of the Extend the outer edge to the suction opening of the impeller are preferably proposed.
  • the outer blades begin at a distance from the outer edge of the impeller.
  • the outer blades at a distance to the suction port of the Impeller ends. It is preferably proposed that one to eight outer blades are arranged. A simple production and construction is then given when the outer blades have a constant thickness. low Flow losses are achieved when the leading edge of the outer blades having a particular thickened nose radius. Further, for the function important that the outer blades are oppositely curved to the inner impeller blades.
  • the impeller 1 additionally drives.
  • the outer blades 8 extend from the outer edge 11 to the suction port 5 of the impeller. Alternatively, the outer blades 8 start at a distance from the outer edge 11 of the impeller 1. Additionally or Alternatively, the outer blades 8 at a distance from the suction opening. 5 of the impeller 1 end.
  • the number of outer blades 8 may be different. Preferably it's one to eight shovels.
  • the outer blades 8 may in thickness of the Suction side to the pressure side change or a constant thickness have.
  • the leading edge 10 of the outer blades 8 may have a Possess nose radius, which can be thickened.
  • outer blades 8 Since the outer blades 8 must have a turbine effect, it is important the outer blades 8 are curved opposite to the inner ones Impeller blades 3.

Landscapes

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

Description

Die Erfindung betrifft eine Kreiselpumpe mit einem beschaufelten Laufrad, dem auf seiner Saugseite die Förderflüssigkeit axial zugeführt wird, wobei auf der Saugseite die Schaufeln durch eine ringförmige koaxiale Deckscheibe abgedeckt sind, die mit der Pumpengehäuseinnenwand einen Spalt bildet, durch den ein Teil der geförderten Flüssigkeit als Spaltstrom zur Saugseite zurückströmt.The invention relates to a centrifugal pump with a bladed impeller, the is fed axially on its suction side, the delivery liquid, wherein on the Suction side, the blades covered by an annular coaxial cover disc which forms a gap with the pump housing inner wall through which a part the conveyed liquid flows back as a split flow to the suction side.

Es ist bei Kreiselpumpen bekannt, dass ein Teil der aus dem Laufrad austretenden Flüssigkeit von der Druckseite seitlich außen am Laufrad vorbei zur Saugseite als Spaltstrom zurückfließt. Da der Spalt zwischen Laufradvorderseite und Gehäuseinnenwand nicht beliebig klein gewählt werden kann, ist ein solcher Rückfluss nicht zu verhindern. Insbesondere bei einer Verkleinerung der Pumpen ist ein relatives Anwachsen der Spaltweiten und der Spaltströme zu beobachten. Dadurch entstehen erhebliche Verlustanteile.It is known in centrifugal pumps that part of the impeller leaking fluid from the pressure side laterally outside the impeller over to The suction side flows back as a gap current. Because the gap between the front wheel and housing inner wall can not be chosen arbitrarily small, is such Not to prevent reflux. Especially with a reduction of the pumps a relative increase in the gap widths and the gap currents can be observed. This results in significant loss shares.

Aus der US 4 883 403 ist eine Kreiselpumpe bekannt, bei der das Laufrad mit Deckscheibe in dem Spalt zwischen Deckscheibe und Gehäuse zusätzliche Schaufeln zur Förderung des Fluids trägt. From US 4,883,403 a centrifugal pump is known in which the impeller with Cover disc in the gap between cover plate and housing additional Carrying blades for conveying the fluid.

Aus der WO 00/71237 ist eine Pumpe bekannt, bei der das Laufrad zu beiden Seiten beschaufelt ist.From WO 00/71237 a pump is known in which the impeller to both Pages is bladed.

Die US 4,854,820 offenbart eine Kreiselpumpe, deren Laufrad eine Deckscheibe aufweist, wobei die Deckscheibe auf ihrer dem Gehäuse zugewandten Außenseite Strömungskanäle bildende, zusätzliche Schaufeln zur Förderung des Fluids aufweist.US 4,854,820 discloses a centrifugal pump whose impeller is a cover disk has, wherein the cover plate on its side facing the housing Flow channels forming, additional blades for conveying the fluid having.

Nachteilig bei derartig beschaufelten Laufrädern mit Deckscheibe und zusätzlicher Pumpenbeschaufelung im Spalt sind hohe Strömungsverluste, da diese zusätzlichen Schaufeln gegen den Druckgradienten im Spalt fördern.A disadvantage of such bladed wheels with cover and additional Pump blading in the gap are high flow losses, as these promote additional blades against the pressure gradient in the gap.

Aufgabe der Erfindung ist es, bei Kreiselpumpen insbesondere kleiner Bauart dafür zu sorgen, dass der Flüssigkeitsrückfluss im Spalt zwischen Laufrad und Gehäuseinnenwand zu möglichst geringen Verlusten führt.The object of the invention is, in centrifugal pumps in particular small design to ensure that the liquid reflux in the gap between the impeller and Housing inner wall leads to the lowest possible losses.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, dass auf der Außenseite der Deckscheibe Schaufeln angeordnet sind, durch die das Laufrad vom Spaltstrom zusätzlich antreibbar ist.This object is achieved in that on the outside the shroud blades are arranged through which the impeller from Gap current is additionally driven.

Durch diesen zusätzlichen Antrieb des Laufrades, erfolgt eine positive Beeinflussung der Kennlinie bei Kreiselpumpen mit Radseitenräumen. Leistung und Wirkungsgrad einer Kreiselpumpe werden hierdurch verbessert. Besonders vorteilhaft ist diese Lösung bei Kreiselpumpen kleiner Bauart.Through this additional drive of the impeller, there is a positive Influencing the characteristic curve of centrifugal pumps with wheel-side cavities. power and efficiency of a centrifugal pump are thereby improved. Especially This solution is advantageous in centrifugal pumps of small design.

Vorzugsweise wird vorgeschlagen, dass die äußeren Schaufeln sich vom Außenrand bis zur Saugöffnung des Laufrades erstrecken. Alternativ können die äußeren Schaufeln in einem Abstand vom Außenrand des Laufrades beginnen. Auch können die äußeren Schaufeln in einem Abstand zur Saugöffnung des Laufrades enden. Vorzugsweise wird vorgeschlagen, dass ein bis acht äußere Schaufeln angeordnet sind. Eine einfache Herstellung und Konstruktion ist dann gegeben, wenn die äußeren Schaufeln eine konstante Dicke aufweisen. Geringe Strömungsverluste werden erreicht, wenn die Eintrittskante der äußeren Schaufeln einen insbesondere verdickten Nasenradius aufweist. Ferner ist für die Funktion wichtig, dass die äußeren Schaufeln entgegengesetzt gekrümmt sind zu den inneren Laufradschaufeln.It is preferably proposed that the outer blades of the Extend the outer edge to the suction opening of the impeller. Alternatively, the outer blades begin at a distance from the outer edge of the impeller. Also, the outer blades at a distance to the suction port of the Impeller ends. It is preferably proposed that one to eight outer blades are arranged. A simple production and construction is then given when the outer blades have a constant thickness. low Flow losses are achieved when the leading edge of the outer blades having a particular thickened nose radius. Further, for the function important that the outer blades are oppositely curved to the inner impeller blades.

Ein Ausführungsbeispiel der Erfindung ist in den Zeichnungen dargestellt und wird im folgenden näher beschrieben.

Fig. 1
einen axialen Schnitt durch die Pumpe als Ausschnitt,
Fig. 2
eine Ansicht der Außenseite des Laufrades mit den äußeren Schaufeln.
Das Laufrad 1 einer Radialkreiselpumpe sitzt auf einer Welle 2, die von einem nicht dargestellten Elektromotor angetrieben wird. Die gebogenen inneren Schaufeln 3 des Laufrades sind zu beiden Seiten abgedeckt. Auf der Vorderseite bildet das Laufrad 1 eine ringförmige koaxiale Deckscheibe 4, in deren Mitte sich die Saugöffnung 5 befindet.An embodiment of the invention is illustrated in the drawings and will be described in more detail below.
Fig. 1
an axial section through the pump as a cutout,
Fig. 2
a view of the outside of the impeller with the outer blades.
The impeller 1 of a centrifugal centrifugal pump sits on a shaft 2 which is driven by an electric motor, not shown. The curved inner blades 3 of the impeller are covered on both sides. On the front, the impeller 1 forms an annular coaxial cover plate 4, in the middle of which the suction opening 5 is located.

Zwischen der Außenseite der Deckscheibe 4 und der Innenwand 6 des Pumpengehäuses befindet sich ein Spalt 7, in dem äußere Schaufeln 8 liegen, die an der Außenseite der Deckscheibe 4 befestigt insbesondere angeformt sind. Die Schaufeln 8 sind so ausgerichtet und geformt, dass der von der Druckseite 9 zur Saugseite fließende Rückstrom (Rückfluss) das Laufrad 1 zusätzlich antreibt.Between the outside of the cover plate 4 and the inner wall 6 of the Pump housing is a gap 7, in the outer blades are 8, the attached to the outside of the cover plate 4 are in particular integrally formed. The Blades 8 are aligned and shaped so that from the pressure side 9 to Suction side flowing return flow (return flow), the impeller 1 additionally drives.

In einer Ausführung erstrecken sich die äußeren Schaufeln 8 vom Außenrand 11 bis zur Saugöffnung 5 des Laufrades. Alternativ können die äußeren Schaufeln 8 in einem Abstand vom Außenrand 11 des Laufrades 1 beginnen. Zusätzlich oder alternativ können die äußeren Schaufeln 8 in einem Abstand zur Saugöffnung 5 des Laufrades 1 enden. In one embodiment, the outer blades 8 extend from the outer edge 11 to the suction port 5 of the impeller. Alternatively, the outer blades 8 start at a distance from the outer edge 11 of the impeller 1. Additionally or Alternatively, the outer blades 8 at a distance from the suction opening. 5 of the impeller 1 end.

Die Anzahl der äußeren Schaufeln 8 kann unterschiedlich sein. Vorzugsweise sind es ein bis acht Schaufeln. Die äußeren Schaufeln 8 können in ihrer Dicke von der Saugseite zur Druckseite sich verändern oder auch eine gleichbleibende Dicke besitzen. Die Eintrittskante 10 der äußeren Schaufeln 8 können einen Nasenradius besitzen, der verdickt sein kann.The number of outer blades 8 may be different. Preferably it's one to eight shovels. The outer blades 8 may in thickness of the Suction side to the pressure side change or a constant thickness have. The leading edge 10 of the outer blades 8 may have a Possess nose radius, which can be thickened.

Da die äußeren Schaufeln 8 eine Turbinenwirkung haben müssen, ist es wichtig, dass die äußeren Schaufeln 8 entgegengesetzt gekrümmt sind zu den inneren Laufradschaufeln 3.Since the outer blades 8 must have a turbine effect, it is important the outer blades 8 are curved opposite to the inner ones Impeller blades 3.

Claims (8)

  1. Centrifugal pump with a bladed impeller (1) to which, on its suction side, the pumped fluid is fed axially, whereby on the suction side, the blades (3) are covered by a ring-shaped coaxial cover plate (4), which forms a gap (7) with the pump housing inner wall (6), through which part of the pumped fluid flows back to the suction side as a gap flow, characterised in that arranged on the exterior side of the cover plate (4) are exterior blades (8), by means of which the impeller (1) may additionally be driven by the gap flow.
  2. Centrifugal pump according to claim 1, characterised in that the exterior blades (8) extend from the outer edge (11) to the suction opening (5) of the impeller (1).
  3. Centrifugal pump according to claim 1, characterised in that the exterior blades (8) begin at a distance from the outer edge (11) of the impeller (1).
  4. Centrifugal pump according to claim 1 or 3, characterised in that the exterior blades (8) end at a distance from the suction opening (5) of the impeller (1).
  5. Centrifugal pump according to one of the previous claims, characterised in that one to eight exterior blades (8) are provided.
  6. Centrifugal pump according to one of the previous claims, characterised in that the exterior blades (8) have a constant thickness.
  7. Centrifugal pump according to one of the previous claims, characterised in that the entry edge (10) of the exterior blades has a specially thickened nose radius.
  8. Centrifugal pump according to one of the previous claims, characterised in that the exterior blades (8) are curved in a manner that is opposed to the interior impeller blades (3).
EP03027121A 2003-02-25 2003-11-26 Centrifugal pump Expired - Lifetime EP1457682B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2003107883 DE10307883A1 (en) 2003-02-25 2003-02-25 Centrifugal pump, has external shovel on the circular coaxial cover disk forming a gap with the pump housing inner wall so that part of the conveyed liquid flows back to the suction face of the motor-wheel
DE10307883 2003-02-25

Publications (2)

Publication Number Publication Date
EP1457682A1 EP1457682A1 (en) 2004-09-15
EP1457682B1 true EP1457682B1 (en) 2005-08-10

Family

ID=32748040

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03027121A Expired - Lifetime EP1457682B1 (en) 2003-02-25 2003-11-26 Centrifugal pump

Country Status (2)

Country Link
EP (1) EP1457682B1 (en)
DE (2) DE10307883A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102052354A (en) * 2010-12-07 2011-05-11 湖南耐普泵业有限公司 High-speed multiphase flow gas-dissolving pump

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012201665B4 (en) * 2012-02-06 2021-11-04 KSB SE & Co. KGaA Centrifugal pump impeller
DE202016008351U1 (en) 2016-08-09 2017-10-09 Fibre Optics Ct Gmbh, Consulting & Testing Intruder alarm notification device

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE193313C (en) *
US1879803A (en) * 1930-01-27 1932-09-27 Andrew G Johnson Rotary pump
US2207317A (en) * 1938-08-05 1940-07-09 Glenn M Freeman Centrifugal pump
DE1503248A1 (en) * 1964-11-21 1969-05-08 Alfa Romeo Societa Per Azioni Impeller for rotating power and work machines
GB2143285B (en) * 1983-07-14 1987-11-11 Warman Int Ltd Centrifugal impeller
US4883403A (en) * 1986-10-07 1989-11-28 Warman International Limited Impellers for centrifugal pumps
SU1528035A1 (en) * 1987-02-18 1994-10-30 А.И. Золотарь Centrifugal pump
AU5239300A (en) * 1999-05-25 2000-12-12 Maria Bata Device for the mixing of liquid with gas and/or other liquids and/or granular, favourably powder-like material, and for the transportation of such mixtures

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102052354A (en) * 2010-12-07 2011-05-11 湖南耐普泵业有限公司 High-speed multiphase flow gas-dissolving pump
CN102052354B (en) * 2010-12-07 2012-04-25 湖南耐普泵业有限公司 High-speed multiphase flow gas-dissolving pump

Also Published As

Publication number Publication date
DE50300951D1 (en) 2005-09-15
DE10307883A1 (en) 2004-09-02
EP1457682A1 (en) 2004-09-15

Similar Documents

Publication Publication Date Title
DE69620635T2 (en) PUMP WHEEL WITH SEPARATED, SLITTED RODS
DE102016209312A1 (en) ELECTRIC CIRCULAR PUMP
EP3224483B1 (en) Centrifugal pump with guiding device
EP0894196B1 (en) Peripheral pump
DE6921197U (en) IMPELLER FOR CENTRIFUGAL PUMPS
EP1457682B1 (en) Centrifugal pump
DE102011119625A1 (en) Glandless pump motor
DE10307887A1 (en) Centrifugal pump has blade whose region adjoining inlet edge has higher elasticity than remaining area in order to bend out from rest position through flow forces
EP3662164A1 (en) Impeller for wastewater pump
EP1021655B1 (en) Delivery pump
DE69414344T2 (en) Lateral flow pump
EP1348078A1 (en) Feed pump
EP1039140B1 (en) Feed pump
EP1053402B1 (en) Centrifugal pump impeller having a radial structure
DE102013220879A1 (en) vacuum pump
DE102007025402A1 (en) End shield for bearing a shaft
WO2019110659A1 (en) Impeller for wastewater pump
WO2009043765A1 (en) Fuel pump for delivering fuel from a reservoir to an internal combustion engine
DE102007025403B4 (en) End shield for bearing a shaft
EP3559475A1 (en) Vortex pump
EP3728860B1 (en) Side channel blower, in particular secondary air blower for an internal combustion engine
DE112005002761B4 (en) combination pump
DE102008056105A1 (en) Side channel blower, in particular secondary air blower for an internal combustion engine
DE102020117818A1 (en) blood pump
WO2014086658A1 (en) Turbomachine

Legal Events

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

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20040517

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR

AX Request for extension of the european patent

Extension state: AL LT LV MK

17Q First examination report despatched

Effective date: 20041028

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

AKX Designation fees paid

Designated state(s): DE FR GB IT

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR GB IT

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

Free format text: NOT ENGLISH

REF Corresponds to:

Ref document number: 50300951

Country of ref document: DE

Date of ref document: 20050915

Kind code of ref document: P

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

Effective date: 20050917

ET Fr: translation filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

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

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

26N No opposition filed

Effective date: 20060511

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

Ref country code: GB

Payment date: 20141126

Year of fee payment: 12

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 13

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

Effective date: 20151126

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 14

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

Ref country code: GB

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

Effective date: 20151126

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 15

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 16

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

Ref country code: FR

Payment date: 20221021

Year of fee payment: 20

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

Ref country code: IT

Payment date: 20221020

Year of fee payment: 20

Ref country code: DE

Payment date: 20221020

Year of fee payment: 20

P01 Opt-out of the competence of the unified patent court (upc) registered

Effective date: 20230615

REG Reference to a national code

Ref country code: DE

Ref legal event code: R071

Ref document number: 50300951

Country of ref document: DE