EP2405143A2 - Centrifugal pump impeller - Google Patents

Centrifugal pump impeller Download PDF

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Publication number
EP2405143A2
EP2405143A2 EP11005625A EP11005625A EP2405143A2 EP 2405143 A2 EP2405143 A2 EP 2405143A2 EP 11005625 A EP11005625 A EP 11005625A EP 11005625 A EP11005625 A EP 11005625A EP 2405143 A2 EP2405143 A2 EP 2405143A2
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EP
European Patent Office
Prior art keywords
impeller
wall
impeller according
outlet opening
outlet
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Granted
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EP11005625A
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German (de)
French (fr)
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EP2405143A3 (en
EP2405143B1 (en
Inventor
Holger Stark
Alfred J. Otto
Wolfgang Geier
Wolfgang Stößner
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Wilo SE
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Wilo SE
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Publication of EP2405143A3 publication Critical patent/EP2405143A3/en
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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
    • F04D29/18—Rotors
    • F04D29/22—Rotors specially for centrifugal pumps
    • F04D29/2238—Special flow patterns
    • F04D29/225—Channel wheels, e.g. one blade or one flow channel
    • 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
    • F04D29/2238—Special flow patterns

Definitions

  • the invention relates to an impeller of a centrifugal pump with a cup-shaped, coaxial with the impeller axis outer wall, closed by an end face and the opposite end face is open and forms the suction mouth. More particularly, the invention relates to an impeller of a pump for the disposal of industrial and municipal untreated raw sewage with lateral outlet channels on the impeller.
  • a major problem of the promoted media is the great risk of clogging by the partly long-fiber components contained in the medium.
  • the previously known impeller shapes are either not susceptible to blockage, with low efficiency, smooth running, with low efficiency, or efficient, with high risk of clogging.
  • the object of the invention is to improve an impeller of the aforementioned type so that it is constipation-prone with high smoothness and large efficiency.
  • This impeller shape combines different characteristics of the previously different constructions. Due to the new design and the integrated changes in the suction mouth area, the characteristics of smoothness and clogging susceptibility with high efficiency are achieved.
  • the fiber particles Due to the cornerless and preferably cylindrical design, the fiber particles are given no opportunity to settle or hang, which is noticeable in the constipation un-susceptibility.
  • the slope also contributes to the constipation-susceptibility.
  • the impeller 1 of a centrifugal pump has a cylindrical, cup-shaped impeller body whose axis is coaxial with the impeller axis.
  • the cylindrical pot outer wall 2 of the Laufradtopfes is closed at one end face 3 and there forms a projecting lug 4 for attachment to the shaft of an electric motor, not shown.
  • the end face 3 opposite the second end face 4 is open and forms the suction mouth 5 of the impeller.
  • each groove is oblique to the impeller axis and is disposed below a passage opening 7, which is located in the pot outer wall 2 and the connection opening is in each case an outlet channel 8, which at the Outside the pot outer wall 2 is arranged.
  • the conveyed liquid is fed together with the solids specifically the passage openings 7 and the outlet channels 8.
  • the lower end of the groove 6 is further away from the associated outlet opening 12 than the upper end of the groove.
  • the up to ten grooves are located in the inflow region to the passage opening of the inflowing medium in a horizontal circular or cylindrical plane arranged below the passage opening.
  • Each of the two, diametrically opposite outlet channels 8 is formed by a channel outer wall 9 and two side walls 10 which terminate at an outlet opening 11 through which the delivered liquid emerges.
  • the channel outer wall which widens outwards in a spiral shape is formed by a curved surface whose straight generatrices are parallel to the impeller axis and run along a curve whose radius increases towards the outside.
  • the side walls 10 are increasingly designed in width, wherein the side walls pass over a curvature in the channel outer wall 9.
  • the upper side wall of the outlet channel can drop both towards the outlet opening 12 and stand perpendicular to the axis of the impeller.
  • Each outlet channel 8 terminates in an outlet opening 12, whose outlet surface is arranged tangentially or at least substantially tangentially to the pot outer wall.
  • the outlet opening 12 has the shape of a trapezoid with two rounded outer corners, this trapezoidal shape is achieved in that the side walls 10 of the outlet channel 8 are arranged obliquely so that their distance A decreases with increasing distance from the cylindrical pot outer wall. This increases in the in Fig. 1 to 3 Illustrated figures, the lower side wall 10 from the inside outwards and the upper side wall 10 falls from the inside outwards. In this context, it is also important that with the vertical impeller axis and the suction mouth arranged at the bottom, the lower side wall 10 rises both towards the outlet opening 12 and also radially outward.
  • the upper side wall of the outlet channel can drop both towards the outlet opening 12 and stand perpendicular to the axis of the impeller.
  • the passage opening 7 has one of the outlet openings 12 close to the impeller axis parallel inner edge 13, which is rounded and is formed by the pot outer wall 2.
  • the pot outer wall 2 is formed on its outer side decreasing, so that the outer edge 14 of the inner edge 13 is tapered decreasing, whereby the passage of the medium and the solids is facilitated.
  • the lower side wall 10 is missing and the inlet opening of the suction mouth is located at the level of the lower region of the outlet channel 8, so that channel 8 and inlet opening merge into one another. Once the impeller is in the pump chamber, the lower portion of the channel 8 is covered by the pump chamber side wall.

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

Abstract

The impeller (1) has a cup-shaped outer wall (2) arranged coaxial to an impeller axis. A front side part (3) is closed, and another front side part (4) is opened by the outer wall for forming a suction port. Two passage openings are arranged in the outer wall. The openings are covered by a discharge duct (8), which includes a curved duct outer wall (9). The duct outer wall forms a discharge opening (12) together with side walls (10) at an end of the duct outer wall. The side walls expand in an escape direction. Inclined supply ducts and/or grooves are arranged in the port.

Description

Die Erfindung betrifft ein Laufrad einer Kreiselpumpe mit einer topfförmigen, zur Laufradachse koaxialen Außenwand, von der eine Stirnseite geschlossen und die gegenüberliegende Stirnseite geöffnet ist und den Saugmund bildet. Die Erfindung betrifft insbesondere ein Laufrad einer Pumpe zum Entsorgen von industriellem und kommunalem ungereinigten Rohabwasser mit seitlichen Austrittskanälen am Laufrad.The invention relates to an impeller of a centrifugal pump with a cup-shaped, coaxial with the impeller axis outer wall, closed by an end face and the opposite end face is open and forms the suction mouth. More particularly, the invention relates to an impeller of a pump for the disposal of industrial and municipal untreated raw sewage with lateral outlet channels on the impeller.

Ein Hauptproblem der geförderten Medien besteht in der großen Verstopfungsgefahr durch die im Medium enthaltenen teils auch langfaserigen Bestandteile. Die bisher bekannten Laufradformen sind entweder verstopfungsunanfällig, bei geringem Wirkungsgrad, laufruhig, bei geringem Wirkungsgrad, oder effizient, bei hoher Verstopfungsgefahr.A major problem of the promoted media is the great risk of clogging by the partly long-fiber components contained in the medium. The previously known impeller shapes are either not susceptible to blockage, with low efficiency, smooth running, with low efficiency, or efficient, with high risk of clogging.

Aufgabe der Erfindung ist es, ein Laufrad der eingangs genannten Art so zu verbessern, dass es bei hoher Laufruhe und großem Wirkungsrad verstopfungsunanfällig ist.The object of the invention is to improve an impeller of the aforementioned type so that it is constipation-prone with high smoothness and large efficiency.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, dass in der zylindrischen Außenwand mindestens zwei Durchtrittsöffnungen angeordnet sind, die jeweils von einem Austrittskanal überdeckt sind, und dass der Austrittskanal eine gekrümmte, sich nach außen insbesondere spiralförmig erweiternde flache Kanalaußenwand aufweist, die zusammen mit sich in Ausströmrichtung erweiternden Seitenwänden an ihrem Ende eine Austrittsöffnung bildet. Vorteilhafte Ausgestaltungen der Erfindung sind in den Unteransprüchen aufgeführt.This object is achieved in that at least two passage openings are arranged in the cylindrical outer wall, which are each covered by an outlet channel, and that the outlet channel has a curved, outwardly in particular spirally flared flat channel outer wall, which widen together with in the outflow direction Side walls at its end forms an outlet opening. Advantageous embodiments of the invention are listed in the subclaims.

Diese Laufradform vereint verschiedene Eigenschaften der bisher unterschiedlichen Konstruktionen. Durch die neue Bauform und die dabei integrierten Veränderungen im Saugmundbereich, werden die Eigenschaften von Laufruhe und Verstopfungsunanfälligkeit bei hohem Wirkungsgrad erreicht.This impeller shape combines different characteristics of the previously different constructions. Due to the new design and the integrated changes in the suction mouth area, the characteristics of smoothness and clogging susceptibility with high efficiency are achieved.

Durch den symmetrischen Aufbau und die im Saugmund angeordneten schrägen Zuführungskanäle bzw. Nuten werden Vibrationen vermieden, da sowohl Gewicht und Mediumfluss homogen verteilt sind und das Medium gezielt in die Kanäle geführt wird. Gleichzeitig können diese Pumpen aufgrund ihrer Laufruhe auch mit Motoren höherer Drehzahlen ausgestattet werden, was sich in den Investitionskosten positiv bemerkbar macht.Due to the symmetrical structure and the oblique feed channels or grooves arranged in the suction mouth, vibrations are avoided, since both the weight and the medium flow are homogeneously distributed and the medium is deliberately guided into the channels. At the same time these pumps can be equipped due to their smoothness with higher-speed motors, which makes a positive impact in the investment costs.

Durch die eckenlose und vorzugsweise zylindrische Bauform wird den Faserpartikeln keine Möglichkeit gegeben, sich festzusetzen oder anzuhängen, was sich in der Verstopfungsunanfälligkeit bemerkbar macht. Die Schräge trägt zusätzlich zur Verstopfungsunanfälligkeit bei.Due to the cornerless and preferably cylindrical design, the fiber particles are given no opportunity to settle or hang, which is noticeable in the constipation un-susceptibility. The slope also contributes to the constipation-susceptibility.

Gleiches gilt für die im Saugmund befindlichen schrägen Zulaufkanäle bzw. Nuten, die die Feststoffe gezielt den Austrittskanälen zuführen.The same applies to the oblique inlet channels or grooves in the suction mouth, which supply the solids specifically to the outlet channels.

Ein Ausführungsbeispiel der Erfindung ist In den Zeichnungen dargestellt und wird im Folgenden näher beschrieben. Es zeigen

Fig. 1 bis 3
drei perspektivische Ansichten des Laufrades,
Fig. 4
einen axialen Schnitt durch das Laufrad,
Fig. 5
einen Schnitt nach B-B in Fig. 4,
Fig. 6
einen Schnitt nach A-A in Fig. 5.
An embodiment of the invention is illustrated in the drawings and will be described in more detail below. Show it
Fig. 1 to 3
three perspective views of the impeller,
Fig. 4
an axial section through the impeller,
Fig. 5
a cut to BB in Fig. 4 .
Fig. 6
a cut to AA in Fig. 5 ,

Das Laufrad 1 einer Kreiselpumpe weist einen zylindrischen, topfförmigen Laufradkörper auf, dessen Achse koaxial mit der Laufradachse ist. Die zylindrische Topfaußenwand 2 des Laufradtopfes ist an einer Stirnseite 3 geschlossen und bildet dort einen vorstehenden Ansatz 4 zum Befestigen an der Welle eines nicht dargestellten Elektromotors. Die der Stirnseite 3 gegenüberliegende zweite Stirnseite 4 ist offen und bildet den Saugmund 5 des Laufrades.The impeller 1 of a centrifugal pump has a cylindrical, cup-shaped impeller body whose axis is coaxial with the impeller axis. The cylindrical pot outer wall 2 of the Laufradtopfes is closed at one end face 3 and there forms a projecting lug 4 for attachment to the shaft of an electric motor, not shown. The end face 3 opposite the second end face 4 is open and forms the suction mouth 5 of the impeller.

In der Innenwand des Saugmunds 5 sind Kanäle bzw. Nuten 6 eingebracht, wobei jede Nut schräg zur Laufradachse liegt und jeweils unterhalb einer Durchtrittsöffnung 7 angeordnet ist, die sich in der Topfaußenwand 2 befindet und die Verbindungsöffnung darstellt zu jeweils einem Austrittskanal 8, der an der Außenseite der Topfaußenwand 2 angeordnet ist. Durch die Nuten 6 bzw. die schrägen Zulaufkanäle 6 wird die geförderte Flüssigkeit zusammen mit den Feststoffen gezielt den Durchtrittsöffnungen 7 und den Austrittskanälen 8 zugeführt. Hierbei ist das untere Ende der Nut 6 weiter von der dazugehörigen Austrittsöffnung 12 entfernt ist als das obere Ende der Nut. Die bis zu zehn Nuten liegen im Anströmungsbereich zu der Durchtrittsöffnung des zufließenden Mediums in einer unterhalb der Durchtrittsöffnung angeordneten, horizontal kreisrunden oder zylindrischen Ebene.In the inner wall of the suction mouth 5 channels or grooves 6 are introduced, each groove is oblique to the impeller axis and is disposed below a passage opening 7, which is located in the pot outer wall 2 and the connection opening is in each case an outlet channel 8, which at the Outside the pot outer wall 2 is arranged. Through the grooves 6 and the oblique inlet channels 6, the conveyed liquid is fed together with the solids specifically the passage openings 7 and the outlet channels 8. Here, the lower end of the groove 6 is further away from the associated outlet opening 12 than the upper end of the groove. The up to ten grooves are located in the inflow region to the passage opening of the inflowing medium in a horizontal circular or cylindrical plane arranged below the passage opening.

Jeder der beiden, einander diametral gegenüberliegenden Austrittskanäle 8 ist von einer Kanalaußenwand 9 und zwei Seitenwänden 10 gebildet, die an einer Austrittsöffnung 11 enden, durch die die geförderte Flüssigkeit austritt. Hierbei wird die sich nach außen spiralförmig erweiternde Kanalaußenwand von einer gekrümmten Fläche gebildet, deren gerade Erzeugenden parallel zur Laufradachse liegen und längs einer Kurve verlaufen, deren Radius nach außen hin zunimmt. Entsprechend dieser Außenwandform sind die Seitenwände 10 in ihrer Breite zunehmend gestaltet, wobei die Seitenwände über eine Krümmung in die Kanalaußenwand 9 übergehen. Hierbei ist auch von Bedeutung, dass bei senkrechter Laufradachse und unten angeordnetem Saugmund die untere Seitenwand 10 sowohl zur Austrittsöffnung 12 als auch radial nach außen hin ansteigt.Each of the two, diametrically opposite outlet channels 8 is formed by a channel outer wall 9 and two side walls 10 which terminate at an outlet opening 11 through which the delivered liquid emerges. In this case, the channel outer wall which widens outwards in a spiral shape is formed by a curved surface whose straight generatrices are parallel to the impeller axis and run along a curve whose radius increases towards the outside. According to this outer wall shape, the side walls 10 are increasingly designed in width, wherein the side walls pass over a curvature in the channel outer wall 9. In this context, it is also important that with the vertical impeller axis and the suction mouth arranged at the bottom, the lower side wall 10 rises both towards the outlet opening 12 and also radially outward.

Die obere Seitenwand des Austrittskanals kann sowohl zur Austrittsöffnung 12 hin abfallen als auch senkrecht zur Achse des Laufrades stehen.The upper side wall of the outlet channel can drop both towards the outlet opening 12 and stand perpendicular to the axis of the impeller.

Jeder Austrittskanal 8 endet in einer Austrittsöffnung 12, deren Austrittsfläche tangential oder zumindest im Wesentlichen tangential zur Topfaußenwand angeordnet ist. Hierbei besitzt die Austrittsöffnung 12 die Form eines Trapezes mit zwei abgerundeten äußeren Ecken, wobei diese Trapezform dadurch zustande kommt, dass die Seitenwände 10 des Austrittskanals 8 derart schräg angeordnet sind, dass ihr Abstand A voneinander mit wachsender Entfernung von der zylindrischen Topfaußenwand abnimmt. Damit steigt in den in Fig. 1 bis 3 dargestellten Abbildungen die untere Seitenwand 10 von innen nach außen hin an und die obere Seitenwand 10 fällt von innen nach außen gesehen ab. Hierbei ist auch von Bedeutung, dass bei senkrechter Laufradachse und unten angeordnetem Saugmund die untere Seitenwand 10 sowohl zur Austrittsöffnung 12 als auch radial nach außen hin ansteigt.Each outlet channel 8 terminates in an outlet opening 12, whose outlet surface is arranged tangentially or at least substantially tangentially to the pot outer wall. Here, the outlet opening 12 has the shape of a trapezoid with two rounded outer corners, this trapezoidal shape is achieved in that the side walls 10 of the outlet channel 8 are arranged obliquely so that their distance A decreases with increasing distance from the cylindrical pot outer wall. This increases in the in Fig. 1 to 3 Illustrated figures, the lower side wall 10 from the inside outwards and the upper side wall 10 falls from the inside outwards. In this context, it is also important that with the vertical impeller axis and the suction mouth arranged at the bottom, the lower side wall 10 rises both towards the outlet opening 12 and also radially outward.

Die obere Seitenwand des Austrittskanals kann sowohl zur Austrittsöffnung 12 hin abfallen als auch senkrecht zur Achse des Laufrades stehen.The upper side wall of the outlet channel can drop both towards the outlet opening 12 and stand perpendicular to the axis of the impeller.

Die Durchtrittsöffnung 7 besitzt eine der Austrittsöffnungen 12 nahe zur Laufradachse parallele Innenkante 13, die abgerundet ist und von der Topfaußenwand 2 gebildet wird. An dieser Innenkante 13 ist die Topfaußenwand 2 an ihrer Außenseite abnehmend gebildet, so dass der Außenrand 14 der Innenkante 13 abnehmend abgeschrägt ist, wodurch der Durchtritt des Mediums und der Feststoffe erleichtert wird.The passage opening 7 has one of the outlet openings 12 close to the impeller axis parallel inner edge 13, which is rounded and is formed by the pot outer wall 2. At this inner edge 13, the pot outer wall 2 is formed on its outer side decreasing, so that the outer edge 14 of the inner edge 13 is tapered decreasing, whereby the passage of the medium and the solids is facilitated.

In einer alternativen Ausgestaltung fehlt die untere Seitenwand 10 und die Eingangsöffnung des Saugmundes befindet sich in Höhe des unteren Bereichs des Austrittskanals 8, so dass Kanal 8 und Eingangsöffnung ineinander übergehen. Sobald das Laufrad sich in der Pumpenkammer befindet, wird der untere Bereich des Kanals 8 durch die Pumpenkammer-Seitenwand abgedeckt.In an alternative embodiment, the lower side wall 10 is missing and the inlet opening of the suction mouth is located at the level of the lower region of the outlet channel 8, so that channel 8 and inlet opening merge into one another. Once the impeller is in the pump chamber, the lower portion of the channel 8 is covered by the pump chamber side wall.

Claims (15)

Laufrad (1) einer Kreiselpumpe mit einer topfförmigen, zur Laufradachse koaxialen Außenwand (2), von der eine Stirnseite (3) geschlossen und die gegenüberliegende Stirnseite geöffnet ist und den Saugmund (5) bildet, dadurch gekennzeichnet, dass in der zylindrischen Außenwand (2) mindestens zwei Durchtrittsöffnungen (7) angeordnet sind, die jeweils von einem Austrittskanal (8) überdeckt sind, und dass der Austrittskanal (8) eine gekrümmte, sich nach außen insbesondere spiralförmig erweiternde flache Kanalaußenwand (9) aufweist, die zusammen mit sich in Ausströmrichtung erweiternden Seitenwänden (10) an ihrem Ende eine Austrittsöffnung (12) bildet.Impeller (1) of a centrifugal pump with a cup-shaped, coaxial to the impeller axis outer wall (2), of which one end (3) is closed and the opposite end face is open and the suction mouth (5), characterized in that in the cylindrical outer wall (2 ) are arranged at least two passage openings (7), which are each covered by an outlet channel (8), and that the outlet channel (8) has a curved, outwardly in particular spirally expanding flat channel outer wall (9), which together with in the outflow direction extending side walls (10) at its end an outlet opening (12). Laufrad nach Anspruch1, dadurch gekennzeichnet, dass die Austrittsöffnung (12) die Form eines Trapezes mit zwei abgerundeten äußeren Ecken aufweist.Impeller according to claim 1, characterized in that the outlet opening (12) has the shape of a trapezium with two rounded outer corners. Laufrad nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Innenkante (13) jeder Austrittsöffnung (12) innerhalb der zylindrischen Topfaußenwand (2) liegt.Impeller according to claim 1 or 2, characterized in that the inner edge (13) of each outlet opening (12) within the cylindrical pot outer wall (2). Laufrad nach Anspruch 3, dadurch gekennzeichnet, dass der Außenrand (14) der Innenkante (13) der Austrittsöffnung (12) zur Innenkante hin abnehmend abgeschrägt ist.Impeller according to claim 3, characterized in that the outer edge (14) of the inner edge (13) of the outlet opening (12) is bevelled decreasing towards the inner edge. Laufrad nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass die zwei Seitenwände (10) des Austrittskanals (8) derart schräg angeordnet sind, dass ihr Abstand (A) voneinander mit wachsender Entfernung von der zylindrischen Topfaußenwand (2) abnimmt.Impeller according to one of the preceding claims, characterized in that the two side walls (10) of the outlet channel (8) are arranged obliquely so that their distance (A) from one another decreases with increasing distance from the cylindrical pot outer wall (2). Laufrad nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass bei senkrechter Laufradachse und unten angeordnetem Saugmund die untere Seitenwand (10) sowohl zur Austrittsöffnung (12) als auch radial nach außen hin ansteigt.Impeller according to one of the preceding claims, characterized in that, when the impeller axis is vertical and the suction mouth is arranged at the bottom, the lower side wall (10) rises both towards the outlet opening (12) and radially outwards. Laufrad nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass die obere Seitenwand des Austrittskanals zur Austrittsöffnung hin abfällt.Impeller according to one of the preceding claims, characterized in that the upper side wall of the outlet channel drops towards the outlet opening. Laufrad nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass die Austrittsöffnung (12) im Wesentlichen tangential zur Topfaußenwand (2) angeordnet ist.Impeller according to one of the preceding claims, characterized in that the outlet opening (12) is arranged substantially tangentially to the pot outer wall (2). Laufrad nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass die Innenwand des Saugmundes (5) mindestens eine zur Laufradachse schräge Nut (6) aufweist, um eine Verwirbelung der eingehenden Strömung zu erreichen.Impeller according to one of the preceding claims, characterized in that the inner wall of the suction mouth (5) has at least one oblique groove to the impeller shaft (6) in order to achieve a turbulence of the incoming flow. Laufrad nach Anspruch 9, dadurch gekennzeichnet, dass die Nut (6) unterhalb der Durchtrittsöffnung (7) angeordnet ist.Impeller according to claim 9, characterized in that the groove (6) below the passage opening (7) is arranged. Laufrad nach Anspruch 9 oer 10, dadurch gekennzeichnet, dass das untere Ende der Nut (6) weiter von der dazugehörigen Austrittsöffnung (12) entfernt ist als das obere Ende der Nut.An impeller according to claim 9 or 10, characterized in that the lower end of the groove (6) is further away from the associated outlet opening (12) than the upper end of the groove. Laufrad nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass die Kanalaußenwand (9) eine gekrümmte Fläche ist mit einer geraden, zur Laufradachse parallelen Erzeugenden, die längs einer Kurve insbesondere einer spiralförmigen Kurve verläuft.Impeller according to one of the preceding claims, characterized in that the channel outer wall (9) is a curved surface with a straight, parallel to the impeller axis generatrix extending along a curve, in particular a spiral curve. Laufrad nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass es zwei oder vier einander diametral gegenüberliegende Austrittskanäle aufweist.Impeller according to one of the preceding claims, characterized in that it comprises two or four diametrically opposite outlet channels. Laufrad nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass zwei, drei oder vier Austrittskanäle (8) an der Außenseite des topfförmigen Laufradkörpers angeordnet sind.Impeller according to one of the preceding claims, characterized in that two, three or four outlet channels (8) are arranged on the outside of the cup-shaped impeller body. Verwendung eines Laufrades (1) nach einem der vorherigen Ansprüche zur Förderung von industriellen und/oder kommunalen ungereinigten Abwässern.Use of an impeller (1) according to one of the preceding claims for the conveyance of industrial and / or municipal untreated wastewater.
EP11005625.6A 2010-07-09 2011-07-08 Centrifugal pump impeller Active EP2405143B1 (en)

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DE102010026756A DE102010026756B4 (en) 2010-07-09 2010-07-09 Impeller of a centrifugal pump

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EP2405143A2 true EP2405143A2 (en) 2012-01-11
EP2405143A3 EP2405143A3 (en) 2015-01-14
EP2405143B1 EP2405143B1 (en) 2019-08-28

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US2432247A (en) * 1944-11-03 1947-12-09 Lee V Mcanallen Pump
US3134331A (en) * 1963-04-19 1964-05-26 George T Adams Reversible self-priming pump
DE2844990A1 (en) * 1978-10-16 1980-04-17 Wojewodzkie Przed Gospodarki K Centrifugal pump for viscous or solids-laden liq. - has scoop-like blades and central inlet with cutting edges and solids-loosening rods
US20100047094A1 (en) * 2008-08-19 2010-02-25 Higra Industrial Ltda Amphibious modular pumps

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CH94909A (en) * 1921-05-21 1922-06-01 Peter Alfred Channelless centrifugal pump, especially for pumping impure liquids with different specific weights.
DE3615686A1 (en) * 1986-05-09 1987-11-12 Klein Schanzlin & Becker Ag CHANNEL WHEEL FOR CENTRIFUGAL PUMPS

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FR742839A (en) * 1933-03-17
US2432247A (en) * 1944-11-03 1947-12-09 Lee V Mcanallen Pump
US3134331A (en) * 1963-04-19 1964-05-26 George T Adams Reversible self-priming pump
DE2844990A1 (en) * 1978-10-16 1980-04-17 Wojewodzkie Przed Gospodarki K Centrifugal pump for viscous or solids-laden liq. - has scoop-like blades and central inlet with cutting edges and solids-loosening rods
US20100047094A1 (en) * 2008-08-19 2010-02-25 Higra Industrial Ltda Amphibious modular pumps

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EP2405143A3 (en) 2015-01-14
EP2405143B1 (en) 2019-08-28
DE102010026756B4 (en) 2012-10-25

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