EP1802870A1 - Centrifugal pump - Google Patents

Centrifugal pump

Info

Publication number
EP1802870A1
EP1802870A1 EP05789812A EP05789812A EP1802870A1 EP 1802870 A1 EP1802870 A1 EP 1802870A1 EP 05789812 A EP05789812 A EP 05789812A EP 05789812 A EP05789812 A EP 05789812A EP 1802870 A1 EP1802870 A1 EP 1802870A1
Authority
EP
European Patent Office
Prior art keywords
impeller
drive shaft
centrifugal pump
rotor
bearing
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
EP05789812A
Other languages
German (de)
French (fr)
Other versions
EP1802870B8 (en
EP1802870B1 (en
Inventor
Rajko Colic
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.)
Continental Automotive GmbH
Original Assignee
Siemens 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 Siemens AG filed Critical Siemens AG
Publication of EP1802870A1 publication Critical patent/EP1802870A1/en
Application granted granted Critical
Publication of EP1802870B1 publication Critical patent/EP1802870B1/en
Publication of EP1802870B8 publication Critical patent/EP1802870B8/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • F04D29/04—Shafts or bearings, or assemblies thereof
    • F04D29/042—Axially shiftable rotors
    • 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
    • F04D29/04—Shafts or bearings, or assemblies thereof
    • 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
    • F04D29/20—Mounting rotors on shafts

Definitions

  • the invention relates to a centrifugal pump.
  • centrifugal pumps are known. In “centrifugal pumps, Lexikon, KSB Aktiengesellschaft, 1989, pages 124-128", for example, various types of thrust bearings are described in centrifugal pumps. These are axial plain bearings.
  • the arranged to operate centrifugal pumps rotors are directly connected to the drive shaft on which the impeller of the centrifugal pump is attached. Due to the fluidic conditions during operation forces act on the impeller and thus also on the drive shaft, which pull the impeller to the inlet of the medium to be pumped into the centrifugal pump. Thus, at the same time, the rotor mounted on the drive shaft is displaced in the direction of the entrance of the medium to be conveyed.
  • the invention is therefore an object of the invention to provide a centrifugal pump, in which damage by flow due to the impeller of the centrifugal pump forces acting largely avoided. At the same time occurring impact noises should be largely minimized.
  • the object underlying the invention is achieved by a centrifugal pump, which consists of a spiral housing in which the impeller is arranged, in which a rotor is arranged on a drive shaft for the impeller, and the impeller with the drive shaft form-fitting and axially displaceable in connection stands.
  • a centrifugal pump which consists of a spiral housing in which the impeller is arranged, in which a rotor is arranged on a drive shaft for the impeller, and the impeller with the drive shaft form-fitting and axially displaceable in connection stands.
  • wheels for example, radial or Halbaxial renders the rotor, which forms the drive unit together with the stator arranged on the outside, is located in the fluid to be delivered.
  • the impeller is positively connected to the drive shaft and axially displaceable in connection.
  • the positive connection can be done for example by the arrangement of a key.
  • Another advantageous variant is to form the part of the drive shaft associated with the impeller as a polygon, for example as a square. It has surprisingly been found that a transmission of the forces acting on the impeller of the centrifugal pump forces due to the positive and axially displaceable connection of the impeller to the drive shaft are not transmitted to the region of the rotor. In operation, therefore, the rotor remains almost stationary in its position, so that the flow-related disadvantageous forces act only on the relatively low mass of the impeller.
  • a preferred embodiment of the invention is that the rotor is mounted axially.
  • the axial bearing can be done for example by arranging the combination of a bearing disc with a stop.
  • Fig. 1 shows the centrifugal pump in cross section.
  • Fig. 2 shows an alternative embodiment of
  • Fig. 3 shows the impeller and the drive shaft in three-dimensional representation.
  • the centrifugal pump is shown in cross section.
  • the centrifugal pump consists of a spiral housing 4, in which the impeller 3 is arranged.
  • a rotor 1 is arranged, which is externally surrounded by a stator 8.
  • the impeller 3 is positively connected to the drive shaft 2 and axially displaceable in connection. This is done on a piece 2a of the drive shaft 2, which may be designed constructively, for example, as a square.
  • the impeller 3 is then moved during operation vertically to the inlet E of the medium to be conveyed, without that axial forces act on the rotor 1.
  • the rotor 1 is axially supported.
  • a cup-shaped bearing seat 5 is arranged on the drive shaft 2, which is provided for receiving a bearing plate 6.
  • the bearing disk 6 abuts the bearing stop 7 during operation, which is arranged in the spiral housing 4.
  • FIG. 2 an alternative embodiment of the centrifugal pump is shown in three-dimensional cross-section.
  • the arrangement of a cup-shaped bearing seat and the arrangement of a bearing disk have been omitted here.
  • only one stop 5 ' is provided here, which forms a unit together with the housing of the rotor 1 and bears directly against the bearing stop 7.
  • Piece 2a of the drive shaft 2 is formed as a square.
  • adverse, flow-related forces act in the arrow direction on the impeller 3 of the centrifugal pump 1. This shifts axially on the piece 2a of the drive shaft 2.
  • the possibility of axial displacement of the impeller 3 on the drive shaft 2 ensures that these adverse, flow-related Forces can not act on the drive shaft 2 and the rotor 1.
  • the drive shaft 2 and the impeller 3 are shown in three dimensions.
  • the impeller 3 has centrally a recess 3a, which is provided for receiving the piece 2a of the drive shaft 2, on which then the axial displacement takes place.
  • the form-fitting and axially displaceable connection between the impeller 3 and the drive shaft 2 may be constructive in other ways.

Landscapes

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

Abstract

Disclosed is a centrifugal pump comprising a spiral housing (4) in which an impeller (3) is disposed. In said centrifugal pump, a rotor (1) is arranged on a drive shaft (2) for the impeller (3). The impeller (3) is connected to the drive shaft (2) in a positive and axially movable manner.

Description

Beschreibungdescription
Kreiselpumperotary pump
Die Erfindung bezieht sich auf eine Kreiselpumpe.The invention relates to a centrifugal pump.
Kreiselpumpen sind bekannt. In "Kreiselpumpen, Lexikon, KSB Aktiengesellschaft, 1989, Seiten 124 - 128" werden beispielsweise verschiedene Bautypen von Axiallagern in Kreiselpumpen beschrieben. Dabei handelt es sich um Axial- Gleitlager. Die zum Betrieb von Kreiselpumpen angeordneten Rotoren sind direkt mit der Antriebswelle, auf der das Laufrad der Kreiselpumpe befestigt ist, verbunden. Bedingt durch die strömungstechnischen Verhältnisse im Betrieb wirken auf das Laufrad und damit auch auf die Antriebswelle Kräfte ein, die das Laufrad zum Eintritt des zu fördernden Mediums in die Kreiselpumpe ziehen. Somit wird auch gleichzeitig der auf der Antriebswelle befestigte Rotor in Richtung auf den Eintritt des zu fördernden Mediums verschoben. Dabei ist in der Regel nachteilig, dass vorhandene Anschläge schlagartig mit relativ großen Kräften beaufschlagt werden, was zum einen eine relativ geringe Lebensdauer von Teilen der Kreiselpumpe infolge des axialen Spiels der Antriebswelle zur Folge hat. Zum anderen ist das Anschlagen von Bauteilen an die Anschläge mit einer nachteiligen Geräuschentwicklung verbunden, die im Betrieb als störend empfunden wird.Centrifugal pumps are known. In "centrifugal pumps, Lexikon, KSB Aktiengesellschaft, 1989, pages 124-128", for example, various types of thrust bearings are described in centrifugal pumps. These are axial plain bearings. The arranged to operate centrifugal pumps rotors are directly connected to the drive shaft on which the impeller of the centrifugal pump is attached. Due to the fluidic conditions during operation forces act on the impeller and thus also on the drive shaft, which pull the impeller to the inlet of the medium to be pumped into the centrifugal pump. Thus, at the same time, the rotor mounted on the drive shaft is displaced in the direction of the entrance of the medium to be conveyed. It is usually disadvantageous that existing attacks are abruptly acted upon by relatively large forces, which has a relatively low life of parts of the centrifugal pump due to the axial play of the drive shaft to a result. On the other hand, the striking of components to the attacks associated with a negative noise, which is distracting during operation.
Der Erfindung liegt daher die Aufgabe zugrunde, eine Kreiselpumpe zu schaffen, bei welcher Schädigungen durch strömungsbedingt auf das Laufrad der Kreiselpumpe einwirkende Kräfte weitgehend vermieden werden. Gleichzeitig sollen auftretende Anschlaggeräusche weitgehend minimiert werden. Die der Erfindung zugrunde liegende Aufgabe wird durch eine Kreiselpumpe gelöst, die aus einem Spiralgehäuse besteht, in dem das Laufrad angeordnet ist, bei der ein Rotor auf einer Antriebswelle für das Laufrad angeordnet ist, und das Laufrad mit der Antriebswelle formschlüssig und axial verschiebbar in Verbindung steht. Als Laufräder kommen beispielsweise Radialräder oder Halbaxialräder zum Einsatz. Der Rotor, der zusammen mit dem außen angeordneten Stator die Antriebseinheit bildet, befindet sich in dem zu fördernden Fluid. Durch das Zusammenwirken von Stator und Rotor werden die Antriebskräfte auf die Antriebswelle übertragen. Das Laufrad steht mit der Antriebswelle formschlüssig und axial verschiebbar in Verbindung. Die formschlüssige Verbindung kann dabei beispielsweise durch die Anordnung einer Passfeder erfolgen. Eine andere vorteilhafte Variante besteht darin, den mit dem Laufrad in Verbindung stehenden Teil der Antriebswelle als Mehrkant, beispielsweise als Vierkant, auszubilden. Es hat sich in überraschender Weise gezeigt, dass eine Übertragung der strömungsbedingt auf das Laufrad der Kreiselpumpe einwirkenden Kräfte durch die formschlüssig und axial verschiebbare Verbindung des Laufrades mit der Antriebswelle nicht auf den Bereich des Rotors übertragen werden. Im Betrieb verbleibt daher der Rotor nahezu ortsfest in seiner Position, so dass die strömungsbedingt nachteiligen Kräfte nur auf die relativ geringe Masse des Laufrades einwirken. Dadurch wird die Lebensdauer der Kreiselpumpe erhöht, wobei gleichzeitig störende, auftretende Anschlagsgeräusche nahezu vollständig vermieden werden. Durch die auf diese Weise erfolgte Entkopplung der Kraftübertragung vom Laufrad auf den Rotor lassen sich Schädigungen im Innern der Kreiselpumpe besonders vorteilhaft vermeiden. Eine bevorzugte Ausgestaltung der Erfindung besteht darin, dass der Rotor axial gelagert ist. Die axiale Lagerung kann beispielsweise durch die Anordnung der Kombination einer Lagerscheibe mit einem Anschlag erfolgen. Es ist jedoch nicht zwingend erforderlich, eine Lagerscheibe anzuordnen. Für viele Einsatzzwecke reicht es aus, lediglich einen Anschlag im Inneren der Kreiselpumpe anzuordnen, der eine axiale Lagerung des Rotors ermöglicht. Dabei ist vorteilhaft, dass das Laufverhalten allgemein verbessert werden kann und sichergestellt ist, dass keinerlei Kräfte in axialer Richtung auf den Rotor einwirken.The invention is therefore an object of the invention to provide a centrifugal pump, in which damage by flow due to the impeller of the centrifugal pump forces acting largely avoided. At the same time occurring impact noises should be largely minimized. The object underlying the invention is achieved by a centrifugal pump, which consists of a spiral housing in which the impeller is arranged, in which a rotor is arranged on a drive shaft for the impeller, and the impeller with the drive shaft form-fitting and axially displaceable in connection stands. As wheels, for example, radial or Halbaxialräder are used. The rotor, which forms the drive unit together with the stator arranged on the outside, is located in the fluid to be delivered. Through the interaction of stator and rotor, the driving forces are transmitted to the drive shaft. The impeller is positively connected to the drive shaft and axially displaceable in connection. The positive connection can be done for example by the arrangement of a key. Another advantageous variant is to form the part of the drive shaft associated with the impeller as a polygon, for example as a square. It has surprisingly been found that a transmission of the forces acting on the impeller of the centrifugal pump forces due to the positive and axially displaceable connection of the impeller to the drive shaft are not transmitted to the region of the rotor. In operation, therefore, the rotor remains almost stationary in its position, so that the flow-related disadvantageous forces act only on the relatively low mass of the impeller. As a result, the life of the centrifugal pump is increased, while disturbing, occurring stop sounds are almost completely avoided. Due to the decoupling of the power transmission from the impeller to the rotor in this way, damage inside the centrifugal pump can be avoided particularly advantageously. A preferred embodiment of the invention is that the rotor is mounted axially. The axial bearing can be done for example by arranging the combination of a bearing disc with a stop. However, it is not absolutely necessary to arrange a bearing disk. For many purposes, it is sufficient to arrange only one stop inside the centrifugal pump, which allows an axial bearing of the rotor. It is advantageous that the running behavior can be generally improved and it is ensured that no forces acting in the axial direction on the rotor.
Die Erfindung wird nachfolgend anhand der Zeichnung (Fig. 1 bis Fig. 3) näher und beispielhaft erläutert.The invention is explained in more detail below by way of example with reference to the drawing (FIGS. 1 to 3).
Fig. 1 zeigt die Kreiselpumpe im Querschnitt.Fig. 1 shows the centrifugal pump in cross section.
Fig. 2 zeigt eine alternative Ausgestaltung derFig. 2 shows an alternative embodiment of
Kreiselpumpe dreidimensional im Querschnitt.Centrifugal pump in three dimensions in cross section.
Fig. 3 zeigt das Laufrad und die Antriebswelle in dreidimensionaler Darstellung.Fig. 3 shows the impeller and the drive shaft in three-dimensional representation.
In Fig. 1 ist die Kreiselpumpe im Querschnitt dargestellt. Die Kreiselpumpe besteht aus einem Spiralgehäuse 4, in dem das Laufrad 3 angeordnet ist. Auf einer Antriebswelle 2 für das Laufrad 3 ist ein Rotor 1 angeordnet, der außen von einem Stator 8 umgeben ist. Das Laufrad 3 steht mit der Antriebswelle 2 formschlüssig und axial verschiebbar in Verbindung. Dies erfolgt an einem Stück 2a der Antriebswelle 2, das beispielsweise als Vierkant konstruktiv gestaltet sein kann. Auf diesem wird das Laufrad 3 dann im Betrieb vertikal zum Eintritt E des zu fördernden Mediums hin verschoben, ohne dass dabei axiale Kräfte auf den Rotor 1 einwirken. Zusätzlich ist der Rotor 1 axial gelagert. Dazu ist ein becherförmiger Lagersitz 5 auf der Antriebswelle 2 angeordnet, der für die Aufnahme einer Lagerscheibe 6 vorgesehen ist. Die Lagerscheibe 6 stößt im Betrieb an den Lageranschlag 7, der im Spiralgehäuse 4 angeordnet ist.In Fig. 1, the centrifugal pump is shown in cross section. The centrifugal pump consists of a spiral housing 4, in which the impeller 3 is arranged. On a drive shaft 2 for the impeller 3, a rotor 1 is arranged, which is externally surrounded by a stator 8. The impeller 3 is positively connected to the drive shaft 2 and axially displaceable in connection. This is done on a piece 2a of the drive shaft 2, which may be designed constructively, for example, as a square. On this, the impeller 3 is then moved during operation vertically to the inlet E of the medium to be conveyed, without that axial forces act on the rotor 1. In addition, the rotor 1 is axially supported. For this purpose, a cup-shaped bearing seat 5 is arranged on the drive shaft 2, which is provided for receiving a bearing plate 6. The bearing disk 6 abuts the bearing stop 7 during operation, which is arranged in the spiral housing 4.
In Fig. 2 ist eine alternative Ausgestaltung der Kreiselpumpe im Querschnitt dreidimensional dargestellt. Im Unterschied zu der in Fig. 1 dargestellten Form wurde hier auf die Anordnung eines becherförmigen Lagersitzes und auf die Anordnung einer Lagerscheibe verzichtet. Als Ersatz für den becherförmigen Lagersitz gemäß Fig. 1 wird hier lediglich ein Anschlag 5' vorgesehen, der zusammen mit dem Gehäuse des Rotors 1 eine Einheit bildet und direkt am Lageranschlag 7 anliegt. DasIn Fig. 2, an alternative embodiment of the centrifugal pump is shown in three-dimensional cross-section. In contrast to the form shown in FIG. 1, the arrangement of a cup-shaped bearing seat and the arrangement of a bearing disk have been omitted here. As a substitute for the cup-shaped bearing seat shown in FIG. 1, only one stop 5 'is provided here, which forms a unit together with the housing of the rotor 1 and bears directly against the bearing stop 7. The
Stück 2a der Antriebswelle 2 ist als Vierkant ausgebildet. Im Betrieb wirken nachteilige, strömungsbedingte Kräfte in Pfeilrichtung auf das Laufrad 3 der Kreiselpumpe 1. Dieses verschiebt sich axial auf dem Stück 2a der Antriebswelle 2. Durch die Möglichkeit der axialen Verschiebung des Laufrades 3 auf der Antriebswelle 2 ist sichergestellt, dass diese nachteiligen, strömungsbedingten Kräfte nicht auf die Antriebswelle 2 und auf den Rotor 1 einwirken können.Piece 2a of the drive shaft 2 is formed as a square. In operation, adverse, flow-related forces act in the arrow direction on the impeller 3 of the centrifugal pump 1. This shifts axially on the piece 2a of the drive shaft 2. The possibility of axial displacement of the impeller 3 on the drive shaft 2 ensures that these adverse, flow-related Forces can not act on the drive shaft 2 and the rotor 1.
In Fig. 3 sind die Antriebswelle 2 und das Laufrad 3 dreidimensional dargestellt. Das Laufrad 3 weist dabei mittig eine Aussparung 3a auf, die für die Aufnahme des Stückes 2a der Antriebswelle 2, auf dem dann die axiale Verschiebung erfolgt, vorgesehen ist. Die formschlüssige und axial verschiebbare Verbindung zwischen Laufrad 3 und Antriebswelle 2 kann konstruktiv jedoch auch auf andere Weise erfolgen. In Fig. 3, the drive shaft 2 and the impeller 3 are shown in three dimensions. The impeller 3 has centrally a recess 3a, which is provided for receiving the piece 2a of the drive shaft 2, on which then the axial displacement takes place. However, the form-fitting and axially displaceable connection between the impeller 3 and the drive shaft 2 may be constructive in other ways.

Claims

Patentansprüche claims
1. Kreiselpumpe, die aus einem Spiralgehäuse (4) besteht, in dem das Laufrad (3) angeordnet ist, bei der ein Rotor (1) auf einer Antriebswelle (2) für das Laufrad (3) angeordnet ist, und das Laufrad (3) mit der Antriebswelle (2) formschlüssig und axial verschiebbar in Verbindung steht.1. Centrifugal pump, which consists of a spiral housing (4), in which the impeller (3) is arranged, in which a rotor (1) on a drive shaft (2) for the impeller (3) is arranged, and the impeller (3 ) is in positive connection with the drive shaft (2) and axially displaceable in communication.
2. Kreiselpumpe nach Anspruch 1, bei der der Rotor (1) axial gelagert ist. 2. Centrifugal pump according to claim 1, wherein the rotor (1) is axially mounted.
EP05789812A 2004-10-21 2005-09-23 Centrifugal pump Expired - Fee Related EP1802870B8 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004051399A DE102004051399A1 (en) 2004-10-21 2004-10-21 rotary pump
PCT/EP2005/054772 WO2006045676A1 (en) 2004-10-21 2005-09-23 Centrifugal pump

Publications (3)

Publication Number Publication Date
EP1802870A1 true EP1802870A1 (en) 2007-07-04
EP1802870B1 EP1802870B1 (en) 2008-04-09
EP1802870B8 EP1802870B8 (en) 2008-07-02

Family

ID=35395868

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05789812A Expired - Fee Related EP1802870B8 (en) 2004-10-21 2005-09-23 Centrifugal pump

Country Status (5)

Country Link
EP (1) EP1802870B8 (en)
JP (1) JP2008517210A (en)
KR (1) KR20070083908A (en)
DE (2) DE102004051399A1 (en)
WO (1) WO2006045676A1 (en)

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1045204A (en) * 1964-02-11 1966-10-12 Lyon Nicoll Ltd Improvements in or relating to dynamo-electric machines
DE2303608B2 (en) * 1973-01-25 1981-02-12 Grundfos A/S, Bjerringbro (Daenemark) Shaft bearings, especially for a centrifugal pump
DE2510787A1 (en) * 1975-03-08 1976-09-16 Vaillant Joh Kg Circulating pump for central heating - has impeller formed to act as shut off valve when pump stops
DE2640990A1 (en) * 1976-09-11 1978-03-16 Klein Schanzlin & Becker Ag Centrifugal pump with axially compensated impeller - has axially fixed balance ring behind axially free impeller
JPS63277888A (en) * 1987-05-08 1988-11-15 Ebara Corp Vertical type canned motor pump
DE3927391A1 (en) * 1989-08-19 1991-02-21 Bosch Gmbh Robert DEVICE FOR HEATING THE PASSENGER COMPARTMENT OF A MOTOR VEHICLE
JP3537349B2 (en) * 1998-04-20 2004-06-14 日機装株式会社 Thrust balance device
DE10115989A1 (en) * 2000-04-04 2001-12-13 Bernhard Stadler Rotary circulation pump has an axially moveable motor rotor which is automatically positioned to block back circulation when in the quiescent mode
ITMI20010593A1 (en) * 2001-03-21 2002-09-21 Umberto Cambiaghi SELF-BALANCED AXIAL THRUST VERTICAL CENTRIFUGAL PUMP

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2006045676A1 *

Also Published As

Publication number Publication date
EP1802870B8 (en) 2008-07-02
DE102004051399A1 (en) 2006-04-27
EP1802870B1 (en) 2008-04-09
WO2006045676A1 (en) 2006-05-04
JP2008517210A (en) 2008-05-22
KR20070083908A (en) 2007-08-24
DE502005003681D1 (en) 2008-05-21

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