EP0250973A2 - Centrifugal pump - Google Patents

Centrifugal pump Download PDF

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Publication number
EP0250973A2
EP0250973A2 EP87108462A EP87108462A EP0250973A2 EP 0250973 A2 EP0250973 A2 EP 0250973A2 EP 87108462 A EP87108462 A EP 87108462A EP 87108462 A EP87108462 A EP 87108462A EP 0250973 A2 EP0250973 A2 EP 0250973A2
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EP
European Patent Office
Prior art keywords
wall part
centrifugal pump
pump
windows
pump according
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Granted
Application number
EP87108462A
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German (de)
French (fr)
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EP0250973A3 (en
EP0250973B1 (en
Inventor
Ernst Dipl.-Ing. Ashauer
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Individual
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    • 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
    • F04D29/426—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps

Definitions

  • the invention relates to a centrifugal pump with a pump wheel, which is arranged centrally behind an inlet opening and is surrounded by a pump chamber, which is adjoined by a collecting space which has an outlet opening.
  • Such pumps are known as submersible pumps or as pumps with a hose connection and are used, for example, for the water supply in camping sites.
  • a pump wheel which generates the pump pressure in the liquid in a pump chamber, is connected to a wall in the flow direction with the inlet opening.
  • a collection chamber adjoins the pump chamber and has an outlet opening.
  • the invention is therefore based on the object of designing a centrifugal pump of the type mentioned at the outset in such a way that improved suction performance - even compared to air cushions - is possible.
  • the pump chamber is closed in the radial direction by side walls opposite the collecting space, that the side walls have at least one passage window, and that the total window area is between 100 and 200% of the size of the entrance opening.
  • the centrifugal pump according to the invention thus has a side wall separating the pump chamber and the collecting space, which is interrupted on its peripheral surface by at least one passage window.
  • a side wall separating the pump chamber and the collecting space, which is interrupted on its peripheral surface by at least one passage window.
  • several, in particular up to four windows are provided, so that wall parts alternate with windows and wall parts without windows over the circumference of the side wall.
  • centrifugal pump according to the invention provides a significantly improved suction performance and is able to completely remove smaller air cushions standing at the inlet opening, so that undisturbed pumping of the liquid is achieved.
  • the size of the area of the windows is between 100 and 150% of the size of the cross section of the entrance opening.
  • a significant further improvement in the suction performance is achieved aims that the windows have tapered edges parallel to the axis of the pump wheel, which are formed by a continuous reduction in the wall thickness - preferably in the tangential direction - to the inner diameter of the side walls.
  • the inner walls of the side wall are arranged in an area which is 20 to 40% larger than the diameter of the pump wheel.
  • the height of the windows corresponds approximately to the height of the pump wheel. Furthermore, the ratio of the length of the side wall parts without a window to the length of the side wall parts with a window on the inner radius of the side wall should be at least 1: 1.
  • the side wall designed according to the invention for the pump chamber is preferably formed by appropriately designed approaches on the front wall part and the rear wall part (in the direction of flow) of the housing forming the pump chamber.
  • the front or the rear wall part can be comb-shaped to form the windows, the other part in each case having an annular web, on the inner wall of which the outer walls of the free ends of the comb-shaped wall part rest.
  • the manufacture of the windows is also technically simple in that the front and rear wall parts each have an annular web, which hold an annular comb part or perforated part which has the windows centrally. It is also possible to let the approaches of the two wall parts forming the side walls collide with one another.
  • FIG. 1 shows a section through a submersible pump working as a centrifugal pump, as can be used, for example, for the water supply in camping sites.
  • the submersible pump has an essentially cylindrical motor housing 1 which consists of two housing parts 2, 3 which are connected to one another in a suitable manner.
  • the upper housing part 2 of the motor housing 1 has an upper end wall with a through opening 4, through which an electrical connection cable 5 is passed in a sealed manner.
  • the lower housing part 3 continues on the one hand the cylindrical wall of the upper housing part 2 and forms a bottom piece 6 which has a cylindrical inwardly facing annular extension 7 on which a motor 8 is mounted and through which a motor shaft 9 is guided, on which a pump wheel 10 is attached.
  • the pump wheel 10 is shown in FIG. 1 for reasons explained in more detail below only to the right of the motor axis 9.
  • the lower housing part of the motor housing 1 has at its lower end an annular, downwardly open chamber 11 which merges into an upwardly open hose connection 12 on one side.
  • a pump base part 13 is inserted, which together with the lower contour of the base side 6 of the motor housing 1 forms the annular chamber 11 serving as a collecting chamber and a pump chamber 14 surrounding the pump wheel 10.
  • the pump base part 13 has three support feet 15 on which the pump stands. Between the support feet 15 there is an input opening 16 which is coaxial with the motor shaft 9 and into which the free end of the motor shaft projects.
  • the liquid is directed upwards through correspondingly curved wall pieces, since the collecting space 11 lies both radially outside and above the pump chamber 14.
  • the liquid entering the pump chamber 14 through the inlet opening 16 is thrown outwards by the vanes of the rotating pump wheel 10 and deflected upwards in the above-mentioned way, so that it reaches the collecting space 11.
  • the hose connector 12 Via the hose connector 12, the liquid passes under pressure into supply hoses, at the ends of which it can be removed.
  • an annular, closed side wall 17 is arranged centrally around the motor shaft 9 between the pump chamber 14 and the collecting space 11.
  • the distance between the side wall 17 and the vanes of the pump wheel 10 results from the fact that the inside diameter of the side wall 17 is approximately 1.25 times the pump wheel diameter.
  • Two windows 18 are arranged in the side wall, of which the left half can be clearly seen in FIG. 1 because the half of the pump wheel 10 lying on the left side of the motor axis 9 is not shown.
  • the windows 18 have approximately the height of the wings of the impeller 10. Their length results from the fact that the total cross section of the windows corresponds to the cross section of the entrance opening 16 or is up to 50% larger.
  • the vertical - that is, parallel to the motor axis 9 - standing edges 19 of the window 18 against the the liquid thrown outward is sharply developed.
  • the wall thickness of the side wall 17 in the area of the relevant edge 19 is continuously reduced towards the inner radius, so that the pointed edge 19 is formed in the area of the inner radius.
  • edges 19 is illustrated in FIG. 2 for a pump running in both directions of rotation. If only one direction of rotation is provided for the pump, only one edge 19 needs to be made pointed at a time.
  • the inner circle schematically indicates the diameter of the pump wheel 10.
  • FIG. 3 shows a modified embodiment of the submersible pump according to FIG. 1.
  • the modification consists in the submersible pump having a collecting space 11 ⁇ which extends over the entire height of the housing 1 and has a hose connection above the motor housing 1.
  • the remaining arrangement essentially corresponds to the arrangement according to FIG. 1 and is not explained again in order to avoid repetitions.
  • Figure 4 illustrates the transition from the pump chamber 14 into the annular collecting chamber 11 ⁇ through the windows 18.
  • the side wall 17 tapers inwards towards the window in order to effectively oppose and not oppose the water thrown by the pump wheel 10 to the outside a wider area that could cause turbulence in the flowing water.

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

Abstract

In the case of a centrifugal pump with an impeller (10), which is located centrically behind an inlet aperture (16) and surrounded by a pump chamber (14) adjoined by a collecting chamber (11), which has an outlet aperture (12), the intake rate, particularly the dry intake, is improved by the fact that the pump chamber (14) is sealed off from the collecting chamber (11) in a radial direction by side walls (17), the side walls (17) having at least one through passage (18) and the entire area of the through passage being between 100 and 200% of the size of the inlet aperture (16). <IMAGE>

Description

Die Erfindung betrifft eine Zentrifugalpumpe mit einem Pum­penrad, das zentrisch hinter einer Eingangsöffnung angeord­net ist und von einer Pumpenkammer umgeben ist, an die sich ein Sammelraum anschließt, der eine Ausgangsöffnung auf­weist.The invention relates to a centrifugal pump with a pump wheel, which is arranged centrally behind an inlet opening and is surrounded by a pump chamber, which is adjoined by a collecting space which has an outlet opening.

Derartige Pumpen sind als Tauchpumpen oder als Pumpen mit Schlauchanschluß bekannt und werden beispielsweise für die Wasserversorgung in Campinganlagen verwendet. An eine in Strömungsrichtung vorn liegende Wand mit der Eingangsöff­nung schließt sich ein Pumpenrad an, das in einer Pumpen­kammer den Pumpendruck in der Flüssigkeit erzeugt.Such pumps are known as submersible pumps or as pumps with a hose connection and are used, for example, for the water supply in camping sites. A pump wheel, which generates the pump pressure in the liquid in a pump chamber, is connected to a wall in the flow direction with the inlet opening.

An die Pumpenkammer schließt sich ein Sammel­raum an, der eine Ausgangsöffnung aufweist. Diese Pumpen lassen sich mit einem Kunststoffgehäuse, das zugleich den Antriebsmotor abgedichtet umfaßt, relativ preiswert her­stellen, wenn für solche Anwendungsfälle, wie die Camping-­Wasserversorgung o. ä., auch größere Toleranzen in Kauf ge­nommen werden können.A collection chamber adjoins the pump chamber and has an outlet opening. These pumps can be manufactured relatively cheaply with a plastic housing, which at the same time encompasses the drive motor in a sealed manner, if larger tolerances can be accepted for such applications as camping water supply or the like.

Die Funktion derartiger Pumpen wird problematisch, wenn sich im Bereich der Eingangsöffnung Luft angesammelt hat, die zunächst von der Pumpe abgesaugt werden muß, um dann die Flüssigkeit zu fördern. In der Praxis zeigt es sich, daß in derartigen Fällen die störungsfreie Förderung von Flüssigkeiten nicht erfolgt.The function of such pumps becomes problematic if air has accumulated in the area of the inlet opening, which must first be sucked off by the pump in order to then convey the liquid. In practice, it has been shown that in such cases the smooth delivery of liquids does not take place.

Der Erfindung liegt daher die Aufgabe zugrunde, eine Zen­trifugalpumpe der eingangs erwähnten Art so auszubilden, daß eine verbesserte Ansaugleistung - auch gegenüber Luft­polstern - möglich ist.The invention is therefore based on the object of designing a centrifugal pump of the type mentioned at the outset in such a way that improved suction performance - even compared to air cushions - is possible.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß die Pumpenkammer in radialer Richtung durch Seitenwände gegen­über dem Sammelraum abgeschlossen ist, daß die Seitenwände wenigstens ein Durchtrittsfenster aufweisen, und daß die gesamte Fensterfläche zwischen 100 und 200 % der Größe der Eingangsöffnung liegt.This object is achieved in that the pump chamber is closed in the radial direction by side walls opposite the collecting space, that the side walls have at least one passage window, and that the total window area is between 100 and 200% of the size of the entrance opening.

Die erfindungsgemäße Zentrifugalpumpe weist somit eine Pum­penkammer und Sammelraum trennende Seitenwand auf, die auf ihrer Umfangsfläche von wenigstens einem Durchtritts­fenster unterbrochen ist. Vorzugsweise sind mehrere, insbesondere bis zu vier Fen­ster vorgesehen, so daß sich über den Umfang der Seiten­wand Wandteile mit Fenster und Wandteile ohne Fenster ab­wechseln.The centrifugal pump according to the invention thus has a side wall separating the pump chamber and the collecting space, which is interrupted on its peripheral surface by at least one passage window. Preferably, several, in particular up to four windows are provided, so that wall parts alternate with windows and wall parts without windows over the circumference of the side wall.

Es hat sich gezeigt, daß die erfindungsgemäße Zentrifugal­pumpe eine wesentlich verbesserte Ansaugleistung erbringt und in der Lage ist, kleinere, an der Eingangsöffnung ste­hende Luftpolster vollständig abzutransportieren, so daß ein ungestörtes Pumpen der Flüssigkeit erreicht wird.It has been shown that the centrifugal pump according to the invention provides a significantly improved suction performance and is able to completely remove smaller air cushions standing at the inlet opening, so that undisturbed pumping of the liquid is achieved.

In einer bevorzugten Ausführungsform liegt die Größe der Fläche der Fenster zwischen 100 und 150 % der Größe des Querschnitts der Eingangsöffnung.In a preferred embodiment, the size of the area of the windows is between 100 and 150% of the size of the cross section of the entrance opening.

Bei der erfindungsgemäßen Ausführungsform wird eine wesent­liche weitere Verbesserung der Ansaugleistung dadurch er­ zielt, daß die Fenster spitz zulaufende Kanten parallel zur Achse des Pumpenrades aufweisen, die durch eine kontinuier­liche Verringerung der Wandstärke - vorzugsweise in tangen­tialer Richtung - zum Innendurchmesser der Seitenwände ge­bildet sind.In the embodiment according to the invention, a significant further improvement in the suction performance is achieved aims that the windows have tapered edges parallel to the axis of the pump wheel, which are formed by a continuous reduction in the wall thickness - preferably in the tangential direction - to the inner diameter of the side walls.

In einer bevorzugten Dimensionierung sind die Innenwände der Seitenwand in einem Bereich angeordnet, der 20 bis 40 % grö­ßer als der Durchmesser des Pumpenrades ist.In a preferred dimensioning, the inner walls of the side wall are arranged in an area which is 20 to 40% larger than the diameter of the pump wheel.

In einer weiteren bevorzugten Ausführungsform entspricht die Höhe der Fenster etwa der Höhe des Pumpenrades. Ferner soll­te das Verhältnis der Länge der Seitenwandteile ohne Fenster zu der Länge der Seitenwandteile mit Fenster auf dem Innen­radius der Seitenwand wenigstens 1 : 1 sein.In a further preferred embodiment, the height of the windows corresponds approximately to the height of the pump wheel. Furthermore, the ratio of the length of the side wall parts without a window to the length of the side wall parts with a window on the inner radius of the side wall should be at least 1: 1.

Die erfindungsgemäß ausgebildete Seitenwand für die Pumpen­kammer wird vorzugsweise durch entsprechend ausgebildete Ansätze an dem vorderen Wandteil und dem hinteren Wandteil (in Strömungsrichtung) des die Pumpenkammer bildenden Gehäu­ses gebildet. Hierzu kann das vordere oder das hintere Wand­teil zur Bildung der Fenster kammförmig ausgebildet sein, wobei der jeweils andere Teil einen ringförmigen Steg auf­weist, an dessen Innenwand die Außenwände der freien Enden des kammförmigen Wandteils anliegen.The side wall designed according to the invention for the pump chamber is preferably formed by appropriately designed approaches on the front wall part and the rear wall part (in the direction of flow) of the housing forming the pump chamber. For this purpose, the front or the rear wall part can be comb-shaped to form the windows, the other part in each case having an annular web, on the inner wall of which the outer walls of the free ends of the comb-shaped wall part rest.

Fertigungstechnisch einfach ist auch die Herstellung der Fenster dadurch, daß das vordere und das hintere Wandteil je einen ringförmigen Steg aufweisen, die ein die Fenster auf­weisendes ringförmiges Kammteil bzw. Lochteil zentrisch halten.
Ferner ist es möglich, die die Seitenwände bildenden Ansätze der beiden Wandteile aufeinanderstoßen zu lassen.The manufacture of the windows is also technically simple in that the front and rear wall parts each have an annular web, which hold an annular comb part or perforated part which has the windows centrally.
It is also possible to let the approaches of the two wall parts forming the side walls collide with one another.

Die Erfindung soll im folgenden anhand eines in der Zeich­nung dargestellten Ausführungsbeispiels näher erläutert werden. Es zeigen:

  • Figur 1 - einen Vertikalschnitt durch eine stehende Tauch­pume
  • Figur 2 - einen Horizontalschnitt durch die die Pumpenkam­mer von dem Sammelraum trennende Seitenwand mit Fenstern
  • Figur 3 - einen Vertikalschnitt durch eine stehënde Tauch­pumpe mit einem ringförmigen Sammelraum
  • Figur 4 - einen Horizontalschnitt entlang der Linie A-B in Figur 3
The invention will be explained below with reference to an embodiment shown in the drawing. Show it:
  • Figure 1 - a vertical section through a standing submersible pump
  • Figure 2 - a horizontal section through the side wall separating the pump chamber from the collecting space with windows
  • Figure 3 - a vertical section through a standing submersible pump with an annular collecting space
  • 4 shows a horizontal section along the line AB in FIG

Figur 1 zeigt einen Schnitt durch eine als Zentrifugal­pumpe arbeitende Tauchpumpe, wie sie beispielsweise für die Wasserversorgung in Campinganlagen verwendbar ist. In Über­einstimmung mit dem bisher bekannten Aufbau weist die Tauch­pumpe ein im wesentlichen zylindrisches Motorgehäuse 1 auf, das aus zwei Gehäuseteilen 2,3 besteht, die in geeigneter Weise miteinander verbunden sind. Das obere Gehäuseteil 2 des Motorgehäuses 1 weist eine obere Stirnwand mit einer Durchgangsöffnung 4 auf, durch die ein elektrisches Anschluß­kabel 5 abgedichtet hindurchgeführt ist. Das untere Gehäuse­teil 3 setzt einerseits die zylindrische Wandung des oberen Gehäuseteils 2 fort und bildet ein Bodenstück 6, das einen zylindrisch nach innen weisenden ringförmigen Ansatz 7 auf­weist, auf dem ein Motor 8 lagert und durch den eine Motor­welle 9 hindurchgeführt ist, auf der ein Pumpenrad 10 be­festigt ist. Das Pumpenrad 10 ist in Figur 1 aus unten näher erläuterten Gründen nur rechts von der Motorachse 9 darge­stellt.FIG. 1 shows a section through a submersible pump working as a centrifugal pump, as can be used, for example, for the water supply in camping sites. In accordance with the previously known construction, the submersible pump has an essentially cylindrical motor housing 1 which consists of two housing parts 2, 3 which are connected to one another in a suitable manner. The upper housing part 2 of the motor housing 1 has an upper end wall with a through opening 4, through which an electrical connection cable 5 is passed in a sealed manner. The lower housing part 3 continues on the one hand the cylindrical wall of the upper housing part 2 and forms a bottom piece 6 which has a cylindrical inwardly facing annular extension 7 on which a motor 8 is mounted and through which a motor shaft 9 is guided, on which a pump wheel 10 is attached. The pump wheel 10 is shown in FIG. 1 for reasons explained in more detail below only to the right of the motor axis 9.

Das untere Gehäuseteil des Motorgehäuses 1 weist an seinem unteren Ende eine ringförmige, nach unten offene Kammer 11 auf, die auf einer Seite in einen nach oben offenen Schlauch­anschluß 12 übergeht.The lower housing part of the motor housing 1 has at its lower end an annular, downwardly open chamber 11 which merges into an upwardly open hose connection 12 on one side.

In das unten offene untere Gehäuseteil 3 des Motorgehäuses ist ein Pumpenbodenteil 13 eingesetzt, das zusammen mit der unteren Kontur der Bodenseite 6 des Motorgehäuses 1 die als Sammelkammer dienende ringförmige Kammer 11 sowie eine das Pumpenrad 10 umgebende Pumpenkammer 14 bildet. Das Pumpenbo­denteil 13 weist drei Stützfüße 15 auf, auf denen die Pumpe steht. Zwischen den Stützfüßen 15 ist eine Eingangsöffnung 16 vorgesehen, die koaxial mit der Motorwelle 9 liegt und in die das freie Ende der Motorwelle hineinragt.In the lower housing part 3 of the motor housing, which is open at the bottom, a pump base part 13 is inserted, which together with the lower contour of the base side 6 of the motor housing 1 forms the annular chamber 11 serving as a collecting chamber and a pump chamber 14 surrounding the pump wheel 10. The pump base part 13 has three support feet 15 on which the pump stands. Between the support feet 15 there is an input opening 16 which is coaxial with the motor shaft 9 and into which the free end of the motor shaft projects.

Zwischen der Pumpenkammer 14 und dem Sammelraum 11 wird die Flüssigkeit durch entsprechend gebogene Wandstücke nach oben geleitet, da der Sammelraum 11 sowohl radial außerhalb als auch oberhalb der Pumpenkammer 14 liegt. Die in die Pumpen­kammer 14 durch die Eingangsöffnung 16 gelangende Flüssig­keit wird von den Flügeln des rotierenden Pumpenrades 10 nach außen geschleudert und auf dem genannten Weg nach oben umgelenkt, so daß sie in den Sammelraum 11 gelangt. Über den Schlauchstutzen 12 gelangt die Flüssigkeit unter Druck in Versorgungsschläuche, an deren Enden sie abnehmbar ist.Between the pump chamber 14 and the collecting space 11, the liquid is directed upwards through correspondingly curved wall pieces, since the collecting space 11 lies both radially outside and above the pump chamber 14. The liquid entering the pump chamber 14 through the inlet opening 16 is thrown outwards by the vanes of the rotating pump wheel 10 and deflected upwards in the above-mentioned way, so that it reaches the collecting space 11. Via the hose connector 12, the liquid passes under pressure into supply hoses, at the ends of which it can be removed.

Erfindungsgemäß ist zwischen der Pumpenkammer 14 und dem Sammelraum 11 eine ringförmige, geschlossene Seitenwand 17 zentrisch um die Motorwelle 9 angeordnet. Der Abstand der Seitenwand 17 zu den Flügeln des Pumpenrades 10 ergibt sich daraus, daß der Innendurchmesser der Seitenwand 17 etwa das 1,25-fache des Pumpenraddurchmessers beträgt. In der Seiten­wand sind zwei Fenster 18 angeordnet, von denen in Figur 1 die linke Hälfte gut erkennbar ist, weil die auf der linken Seite der Motorachse 9 liegende Hälfte des Pumpenrades 10 nicht dargestellt ist. Die Fenster 18 weisen etwa die Höhe der Flügel des Pumpenrades 10 auf. Ihre Länge ergibt sich daraus, daß der Gesamtquerschnitt der Fenster dem Quer­schnitt der Eingangsöffnung 16 entspricht oder bis zu 50 % größer ist. Die vertikal - also parallel zur Mo­torachse 9 - stehenden Kanten 19 der Fenster 18, gegen die die nach außen geschleuderte Flüssigkeit strömt, sind scharf ausgebildet. Hierzu ist die Wandstärke der Seiten­wand 17 im Bereich der betreffenden Kante 19 kontinuierlich zum Innenradius hin verringert, so daß im Bereich des Innen­radius' die spitze Kante 19 entsteht.According to the invention, an annular, closed side wall 17 is arranged centrally around the motor shaft 9 between the pump chamber 14 and the collecting space 11. The distance between the side wall 17 and the vanes of the pump wheel 10 results from the fact that the inside diameter of the side wall 17 is approximately 1.25 times the pump wheel diameter. Two windows 18 are arranged in the side wall, of which the left half can be clearly seen in FIG. 1 because the half of the pump wheel 10 lying on the left side of the motor axis 9 is not shown. The windows 18 have approximately the height of the wings of the impeller 10. Their length results from the fact that the total cross section of the windows corresponds to the cross section of the entrance opening 16 or is up to 50% larger. The vertical - that is, parallel to the motor axis 9 - standing edges 19 of the window 18 against the the liquid thrown outward is sharply developed. For this purpose, the wall thickness of the side wall 17 in the area of the relevant edge 19 is continuously reduced towards the inner radius, so that the pointed edge 19 is formed in the area of the inner radius.

In Figur 2 ist diese Ausbildung der Kanten 19 für eine in beiden Drehrichtungen laufende Pumpe verdeutlicht. Ist für die Pumpe nur eine Drehrichtung vorgesehen, braucht jeweils nur eine Kante 19 spitz ausgebildet zu werden. Der innere Kreis deutet schematisch den Durchmesser des Pumpenrades 10 an.This configuration of the edges 19 is illustrated in FIG. 2 for a pump running in both directions of rotation. If only one direction of rotation is provided for the pump, only one edge 19 needs to be made pointed at a time. The inner circle schematically indicates the diameter of the pump wheel 10.

Es hat sich gezeigt, daß die mit der Erfindung erzielbaren Vorteile insbesondere dann erreicht werden, wenn zwei bis vier Fenster 18 über den Umfang der Seitenwand 17 verteilt vorhanden sind.It has been shown that the advantages which can be achieved with the invention are achieved in particular if two to four windows 18 are distributed over the circumference of the side wall 17.

Figur 3 zeigt eine abgewandelte Ausführungsform der Tauch­pumpe gemäß Figur 1. Die Abwandlung besteht darin, daß die Tauchoumpe einen Sammelraum 11ʹ aufweist, der sich über die gesamte Höhe des Gehäuses 1 erstreckt und einen Schlauchan­schluß oberhalb des Motorgehäuses 1 aufweist. Die übrige Anordnung entspricht im wesentlichen der Anordnung gemäß Figur 1 und wird zur Vermeidung von Wiederholungen nicht erneut erläutert.FIG. 3 shows a modified embodiment of the submersible pump according to FIG. 1. The modification consists in the submersible pump having a collecting space 11ʹ which extends over the entire height of the housing 1 and has a hose connection above the motor housing 1. The remaining arrangement essentially corresponds to the arrangement according to FIG. 1 and is not explained again in order to avoid repetitions.

Figur 4 verdeutlicht den Übergang vom Pumpenraum 14 in den ringförmigen Sammelraum 11ʹ durch die Fenster 18. Auch hier ist die Seitenwand 17 zum Fenster hin nach innen verjüngt spitz ausgebildet, um dem vom Pumpenrad 10 nach außen ge­schleuderten Wasser eine definierte spitze Kante wirksam entgegenzustellen und nicht eine breitere Fläche, die zu Verwirbelungen des strömenden Wassers Anlaß geben könnte.Figure 4 illustrates the transition from the pump chamber 14 into the annular collecting chamber 11ʹ through the windows 18. Here too, the side wall 17 tapers inwards towards the window in order to effectively oppose and not oppose the water thrown by the pump wheel 10 to the outside a wider area that could cause turbulence in the flowing water.

Claims (11)

1. Zentrifugalpumpe mit einem Pumpenrad (10), das zen­trisch hinter einer Eingangsöffnung (16) angeordnet ist und von einer Pumpenkammer (14) umgeben ist, an die sich ein Sammelraum (11) anschließt, der eine Ausgangs­öffnung (12) aufweist, dadurch gekennzeichnet, daß die Pumpenkammer (14) in radialer Richtung durch Seitenwän­de (17) gegenüber dem Sammelraum (11) abgeschlossen ist, daß die Seitenwände (17) wenigstens ein Durchtritts­fenster (18) aufweisen, und daß die gesamte Fenster­fläche zwischen 100 und 200 % der Größe der Engangs­öffnung (16) liegt.1. Centrifugal pump with a pump wheel (10) which is arranged centrally behind an inlet opening (16) and is surrounded by a pump chamber (14) to which a collecting space (11) adjoins, which has an outlet opening (12), characterized that the pump chamber (14) is closed in the radial direction by side walls (17) opposite the collecting space (11), that the side walls (17) have at least one passage window (18), and that the entire window area is between 100 and 200% of the size the entrance opening (16). 2. Zentrifugalpumpe nach Anspruch 1, dadurch gekennzeichnet, daß die gesamte Fensterfläche zwischen 110 und 150 % der Größe der Eingangsöffnung (16) liegt.2. Centrifugal pump according to claim 1, characterized in that the entire window area is between 110 and 150% of the size of the inlet opening (16). 3. Zentrifugalpumpe, dadurch gekennzeichnet, daß die Fen­ster (18) spitz zulaufende Kanten (19) parallel zur Ach­se (9) des Pumpenrades (10) aufweisen. die durch die kontinuierliche Verringerung der Wandstärke zum Innen­durchmesser der Seitenwände (17) gebildet sind.3. Centrifugal pump, characterized in that the windows (18) have tapered edges (19) parallel to the axis (9) of the pump wheel (10). which are formed by continuously reducing the wall thickness to the inside diameter of the side walls (17). 4. Zentrifugalpumpe nach Anspruch 3, dadurch gekennzeichnet, daß die Seitenwand (17) das Pumpenrad (10) kreisförmig umschließt und die spitz zulaufenden Kanten (19) durch eine tangentiale Verjüngung der Wandstärke gebildet sind.4. Centrifugal pump according to claim 3, characterized in that the side wall (17) surrounds the pump wheel (10) in a circle and the tapered edges (19) are formed by a tangential taper of the wall thickness. 5. Zentrifugalpumpe nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Innenseite der Seitenwand in ei­nem Durchmesserbereich angeordnet ist, der 15 bis 40 % größer als der Durchmesser des Pumpenrades (10) ist.5. Centrifugal pump according to one of claims 1 to 4, characterized in that the inside of the side wall is arranged in a diameter range which is 15 to 40% larger than the diameter of the pump wheel (10). 6. Zentrifugalpumpe nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Höhe der Fenster (18) etwa der Höhe des Pumpenrades (10) entspricht.6. Centrifugal pump according to one of claims 1 to 5, characterized in that the height of the window (18) corresponds approximately to the height of the pump wheel (10). 7. Zentrifugalpumpe nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß die Fenster (18) in axialer Richtung durch je einen umlaufenden Steg begrenzt sind.7. Centrifugal pump according to one of claims 1 to 6, characterized in that the windows (18) are limited in the axial direction by a circumferential web. 8. Zentrifugalpumpe nach einem der Ansprüche 1 bis 7, da­durch gekennzeichnet, daß das die Pumpenkammer (14) bil­dende Pumpengehäuse (1) aus einem vorderen Wandteil (13) und einem hinteren Wandteil (6) besteht, von denen ein Wandteil (13,6) zur Bildung der Fenster (18) kammförmig ausgebildet ist und der andere Wandteil (6,13) einen ring­förmigen Steg aufweist, an dessen Innenwand die Außenwän­der der freien Enden des kammförmigen Wandteils (6,13) anliegen.8. Centrifugal pump according to one of claims 1 to 7, characterized in that the pump chamber (14) forming the pump housing (1) consists of a front wall part (13) and a rear wall part (6), of which a wall part (13,6 ) is comb-shaped to form the windows (18) and the other wall part (6, 13) has an annular web, on the inner wall of which the outer walls of the free ends of the comb-shaped wall part (6, 13) rest. 9. Zentrifugalpumpe nach einem der Ansprüche 1 bis 7 , da­durch gekennzeichnet, daß das die Pumpenkammer (14) bil­dende Gehäuse aus einem vorderen Wandteil (13) und einem hinteren Wandteil (6) besteht, daß das vordere und das hintere Wandteil je einen ringförmigen Steg aufweisen, die ein die Fenster aufweisendes, ringförmiges Kammteil zentrisch halten.9. Centrifugal pump according to one of claims 1 to 7, characterized in that the pump chamber (14) forming the housing consists of a front wall part (13) and a rear wall part (6), that the front and the rear wall part each have an annular web have, which hold an annular comb part having the windows centrally. 10. Zentrifugalpumpe nach einem der Ansprüche 1 bis 7, da­durch gekennzeichnet, daß das die Pumpenkammer (14) bil­dende Gehäuse (1) aus einem vorderen Wandteil (13) und einem hinteren Wandteil (6) besteht und daß die Fenster durch Ansatzteile des vorderen Wandteils (13) und des hinteren Wandteils (6) gebildet sind, die mit demselben Durchmesser aufeinanderstoßend miteinander verbunden sind.10. Centrifugal pump according to one of claims 1 to 7, characterized in that the pump chamber (14) forming the housing (1) consists of a front wall part (13) and a rear wall part (6) and that the windows through extension parts of the front wall part (13) and the rear wall part (6) are formed, which are connected to one another with the same diameter. 11. Zentrifugalpumpe nach einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, daß das Verhältnis der Länge der Seitenwandteile (17) ohne Fenster zur Länge der Seitenwandteile (17) mit Fenster (18) auf dem Innen­radius der Seitenwand (17) wenigstens 1 : 1 ist.11. Centrifugal pump according to one of claims 1 to 10, characterized in that the ratio of the length of the side wall parts (17) without window to the length of the side wall parts (17) with window (18) on the inner radius of the side wall (17) at least 1: 1 is.
EP19870108462 1986-07-02 1987-06-11 Centrifugal pump Expired - Lifetime EP0250973B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3622168 1986-07-02
DE19863622168 DE3622168A1 (en) 1986-07-02 1986-07-02 CENTRIFUGAL PUMP

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EP0250973A2 true EP0250973A2 (en) 1988-01-07
EP0250973A3 EP0250973A3 (en) 1989-12-13
EP0250973B1 EP0250973B1 (en) 1991-01-23

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100414114C (en) * 2002-12-18 2008-08-27 Bsh博施及西门子家用器具有限公司 Water-bearing domestic appliance comprising a drainage pump and corresponding drainage pump

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3837330A1 (en) * 1988-11-03 1990-05-10 Ashauer Ernst Centrifugal pump

Citations (8)

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Publication number Priority date Publication date Assignee Title
US1832619A (en) * 1927-08-08 1931-11-17 Johnson Motor Company Pump
US2540269A (en) * 1946-01-28 1951-02-06 Tecalemit Ltd Centrifugal pump
US3183837A (en) * 1962-01-11 1965-05-18 Guy S Helliwell Pump
FR2274804A1 (en) * 1974-06-14 1976-01-09 Lucas Electrical Co Ltd Electric motor driven fluid pump - has narrow fluid outlet, causing pressure build-up under blade-wheel impeller force
US3945771A (en) * 1973-10-16 1976-03-23 Ebara Manufacturing Co., Ltd. Submerged pump
DE2446862A1 (en) * 1974-10-01 1976-04-08 Allweiler Ag Housing for gland-less centrifugal heating circulation pump - has concentric annular pressure chamber with outlet in housing end wall
FR2376310A1 (en) * 1976-12-28 1978-07-28 Norsk Hydro As LIQUID METAL TRANSFER PROCESS
DE2901456A1 (en) * 1979-01-16 1980-12-11 Reich Kg Regel & Sicherheits Electrically driven deep well pump - has oval-section housing with space for cylindrical motor and crescent-section outlet duct

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1832619A (en) * 1927-08-08 1931-11-17 Johnson Motor Company Pump
US2540269A (en) * 1946-01-28 1951-02-06 Tecalemit Ltd Centrifugal pump
US3183837A (en) * 1962-01-11 1965-05-18 Guy S Helliwell Pump
US3945771A (en) * 1973-10-16 1976-03-23 Ebara Manufacturing Co., Ltd. Submerged pump
FR2274804A1 (en) * 1974-06-14 1976-01-09 Lucas Electrical Co Ltd Electric motor driven fluid pump - has narrow fluid outlet, causing pressure build-up under blade-wheel impeller force
DE2446862A1 (en) * 1974-10-01 1976-04-08 Allweiler Ag Housing for gland-less centrifugal heating circulation pump - has concentric annular pressure chamber with outlet in housing end wall
FR2376310A1 (en) * 1976-12-28 1978-07-28 Norsk Hydro As LIQUID METAL TRANSFER PROCESS
DE2901456A1 (en) * 1979-01-16 1980-12-11 Reich Kg Regel & Sicherheits Electrically driven deep well pump - has oval-section housing with space for cylindrical motor and crescent-section outlet duct

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100414114C (en) * 2002-12-18 2008-08-27 Bsh博施及西门子家用器具有限公司 Water-bearing domestic appliance comprising a drainage pump and corresponding drainage pump

Also Published As

Publication number Publication date
EP0250973A3 (en) 1989-12-13
DE3622168C2 (en) 1989-12-28
DE3767585D1 (en) 1991-02-28
DE3622168A1 (en) 1988-01-14
EP0250973B1 (en) 1991-01-23

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