EP1457682A1 - Centrifugal pump - Google Patents

Centrifugal pump Download PDF

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Publication number
EP1457682A1
EP1457682A1 EP03027121A EP03027121A EP1457682A1 EP 1457682 A1 EP1457682 A1 EP 1457682A1 EP 03027121 A EP03027121 A EP 03027121A EP 03027121 A EP03027121 A EP 03027121A EP 1457682 A1 EP1457682 A1 EP 1457682A1
Authority
EP
European Patent Office
Prior art keywords
blades
impeller
centrifugal pump
pump according
outer blades
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP03027121A
Other languages
German (de)
French (fr)
Other versions
EP1457682B1 (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

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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
    • F04D29/18—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 on its suction side, the liquid is fed axially, on the On the suction side, the blades are covered by an annular coaxial cover disk are, which forms a gap with the inner wall of the pump housing through which a part the pumped liquid flows back to the suction side as a gap flow.
  • the object of the invention is, in particular, of small design in centrifugal pumps to ensure that the liquid reflux in the gap between the impeller and Inner wall leads to the lowest possible losses.
  • the outer blades differ from the Extend the outer edge to the suction opening of the impeller.
  • the start the outer blades at a distance from the outer edge of the impeller.
  • the outer blades can also be at a distance from the suction opening of the Impeller end.
  • outer blades are arranged.
  • a simple manufacture and construction is then given if the outer blades have a constant thickness. low Flow losses are achieved when the leading edge of the outer blades has a particularly thickened nose radius. It is also for the function important that the outer blades are curved opposite to the inner impeller blades.
  • the impeller 1 of a radial centrifugal pump sits on a shaft 2 by a Electric motor, not shown, is driven.
  • the curved inner Blades 3 of the impeller are covered on both sides.
  • On the front side forms the impeller 1 an annular coaxial cover plate 4, in the middle of which the suction opening 5 is located.
  • the outer blades 8 extend from the outer edge 11 to the suction opening 5 of the impeller. Alternatively, the outer blades 8 start at a distance from the outer edge 11 of the impeller 1. In addition or alternatively, the outer blades 8 can be at a distance from the suction opening 5 of the impeller 1 end.
  • the number of outer blades 8 can be different. Are preferred it has one to eight scoops.
  • the outer blades 8 can vary in thickness The suction side to the pressure side change or a constant thickness have.
  • the leading edge 10 of the outer blades 8 can be one Have a nose radius that can be thickened.
  • outer blades 8 Since the outer blades 8 must have a turbine effect, it is important that the outer blades 8 are curved opposite to the inner Impeller blades 3.

Abstract

The pump has a motor-wheel (1) with a suction face on which process fluid is axially supplied. A circular coaxial cover disk (4) covers the shovels (3) on the suction face, with an external shovel (8) on the disk forming a gap (7) with the pump housing inner wall (6) so that part of the conveyed liquid flows back to the suction face.

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 on its suction side, the liquid is fed axially, on the On the suction side, the blades are covered by an annular coaxial cover disk are, which forms a gap with the inner wall of the pump housing through which a part the pumped liquid flows back to the suction side as a gap flow.

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 escaping liquid from the pressure side to the side past the impeller The suction side flows back as a gap flow. Because the gap between the front of the impeller and the inner wall of the housing cannot be chosen arbitrarily small, is one Prevent backflow. Especially when the pumps are downsized a relative increase in the gap widths and the gap currents can be observed. This results in considerable losses.

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 particular, of small design in centrifugal pumps to ensure that the liquid reflux in the gap between the impeller and 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 cover plate blades are arranged through which the impeller from The gap current can also be 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.This additional drive of the impeller results in a positive one Influencing the characteristic curve in centrifugal pumps with wheel side spaces. power This improves the efficiency and efficiency of a centrifugal pump. Especially This solution is advantageous for small-sized centrifugal pumps.

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.It is preferably proposed that the outer blades differ from the Extend the outer edge to the suction opening of the impeller. Alternatively, the start the outer blades at a distance from the outer edge of the impeller. The outer blades can also be at a distance from the suction opening of the Impeller end.

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 one to eight outer blades are arranged. A simple manufacture and construction is then given if the outer blades have a constant thickness. low Flow losses are achieved when the leading edge of the outer blades has a particularly thickened nose radius. It is also for the function important that the outer blades are curved opposite 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.
An embodiment of the invention is shown 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.

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.The impeller 1 of a radial centrifugal pump sits on a shaft 2 by a Electric motor, not shown, is driven. The curved inner Blades 3 of the impeller are covered on both sides. On the front side forms the impeller 1 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 There is a gap 7 in the pump housing, in which outer blades 8 are located attached to the outside of the cover plate 4 are in particular molded. The Blades 8 are aligned and shaped so that the from the pressure side 9 to Backflow (backflow) flowing on the suction side also drives impeller 1.

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 opening 5 of the impeller. Alternatively, the outer blades 8 start at a distance from the outer edge 11 of the impeller 1. In addition or alternatively, the outer blades 8 can be 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 can be different. Are preferred it has one to eight scoops. The outer blades 8 can vary in thickness The suction side to the pressure side change or a constant thickness have. The leading edge 10 of the outer blades 8 can be one Have a nose radius that 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 that the outer blades 8 are curved opposite to the inner Impeller blades 3.

Claims (8)

Kreiselpumpe mit einem beschaufelten Laufrad (1), dem auf seiner Saugseite die Förderflüssigkeit axial zugeführt wird, wobei auf der Saugseite die Schaufeln (3) durch eine ringförmige koaxiale Deckscheibe (4) abgedeckt sind, die mit der Pumpengehäuseinnenwand (6) einen Spalt (7) bildet, durch den ein Teil der geförderten Flüssigkeit als Spaltstrom zur Saugseite zurückströmt, dadurch gekennzeichnet, dass auf der Außenseite der Deckscheibe (4) Schaufeln (8) angeordnet sind, durch die das Laufrad (1) vom Spaltstrom zusätzlich antreibbar ist.Centrifugal pump with a bladed impeller (1) to which the liquid is axially fed on its suction side, the blades (3) on the suction side being covered by an annular coaxial cover plate (4), which forms a gap (7 ) through which a part of the conveyed liquid flows back as a gap flow to the suction side, characterized in that blades (8) are arranged on the outside of the cover plate (4), through which blades the impeller (1) can additionally be driven. Kreiselpumpe nach Anspruch 1,dadurch gekennzeichnet, dass die äußeren Schaufeln (8) sich vom Außenrand (1) bis zur Saugöffnung (5) des Laufrades (1) erstrecken.Centrifugal pump according to claim 1, characterized in that the outer blades (8) extend from the outer edge (1) to the suction opening (5) of the impeller (1). Kreiselpumpe nach Anspruch 1,dadurch gekennzeichnet, dass die äußeren Schaufeln (8) in einem Abstand vom Außenrand (11) des Laufrades (1) beginnen.Centrifugal pump according to claim 1, characterized in that the outer blades (8) begin at a distance from the outer edge (11) of the impeller (1). Kreiselpumpe nach Anspruch 1 oder 3, dadurch gekennzeichnet, dass die äußeren Schaufeln (8) in einem Abstand zur Saugöffnung (5) des Laufrades (1) enden.Centrifugal pump according to claim 1 or 3, characterized in that the outer blades (8) end at a distance from the suction opening (5) of the impeller (1). Kreiselpumpe nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass ein bis acht äußere Schaufeln (8) angeordnet sind.Centrifugal pump according to one of the preceding claims, characterized in that one to eight outer blades (8) are arranged. Kreiselpumpe nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass die äußeren Schaufeln (8) eine konstante Dicke aufweisen. Centrifugal pump according to one of the preceding claims, characterized in that the outer blades (8) have a constant thickness. Kreiselpumpe nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass die Eintrittskante (10) der äußeren Schaufeln einen insbesondere verdickten Nasenradius aufweist.Centrifugal pump according to one of the preceding claims, characterized in that the leading edge (10) of the outer blades has an especially thickened nose radius. Kreiselpumpe nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass die äußeren Schaufeln (8) entgegengesetzt gekrümmt sind zu den inneren Laufradschaufeln (3).Centrifugal pump according to one of the preceding claims, characterized in that the outer blades (8) are curved opposite to the inner 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
DE10307883 2003-02-25
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

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

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EP03027121A Expired - Lifetime EP1457682B1 (en) 2003-02-25 2003-11-26 Centrifugal pump

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DE (2) DE10307883A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012201665A1 (en) * 2012-02-06 2013-08-08 Ksb Aktiengesellschaft Centrifugal pump impeller has rear vanes that are connected to impeller hub section such that mass of rear vanes is increased from outer periphery of impeller main structure toward impeller hub

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
DE202016008351U1 (en) 2016-08-09 2017-10-09 Fibre Optics Ct Gmbh, Consulting & Testing Intruder alarm notification device

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4664592A (en) * 1983-07-14 1987-05-12 Warman International Limited Centrifugal pump impeller configured to limit fluid recirculation
US4854820A (en) * 1987-02-18 1989-08-08 Zolotar Arkady I Centrifugal pump for handling liquids carrying solid abrasive particles
US4883403A (en) * 1986-10-07 1989-11-28 Warman International Limited Impellers for centrifugal pumps
WO2000071237A1 (en) * 1999-05-25 2000-11-30 Ferenc Inotay 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

Family Cites Families (4)

* 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

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4664592A (en) * 1983-07-14 1987-05-12 Warman International Limited Centrifugal pump impeller configured to limit fluid recirculation
US4883403A (en) * 1986-10-07 1989-11-28 Warman International Limited Impellers for centrifugal pumps
US4854820A (en) * 1987-02-18 1989-08-08 Zolotar Arkady I Centrifugal pump for handling liquids carrying solid abrasive particles
WO2000071237A1 (en) * 1999-05-25 2000-11-30 Ferenc Inotay 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
DE102012201665A1 (en) * 2012-02-06 2013-08-08 Ksb Aktiengesellschaft Centrifugal pump impeller has rear vanes that are connected to impeller hub section such that mass of rear vanes is increased from outer periphery of impeller main structure toward impeller hub
DE102012201665B4 (en) 2012-02-06 2021-11-04 KSB SE & Co. KGaA Centrifugal pump impeller

Also Published As

Publication number Publication date
DE10307883A1 (en) 2004-09-02
DE50300951D1 (en) 2005-09-15
EP1457682B1 (en) 2005-08-10

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