EP2226505B1 - Free flow impeller with cutting edges - Google Patents

Free flow impeller with cutting edges Download PDF

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Publication number
EP2226505B1
EP2226505B1 EP10001468.7A EP10001468A EP2226505B1 EP 2226505 B1 EP2226505 B1 EP 2226505B1 EP 10001468 A EP10001468 A EP 10001468A EP 2226505 B1 EP2226505 B1 EP 2226505B1
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EP
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Prior art keywords
cutting edges
winglets
centrifugal pump
blades
faces
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EP10001468.7A
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German (de)
French (fr)
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EP2226505A1 (en
Inventor
Christoph Jäger
Rolf Witzel
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KSB AG
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KSB AG
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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
    • F04D7/00—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts
    • F04D7/02—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type
    • F04D7/04—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type the fluids being viscous or non-homogenous
    • F04D7/045—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type the fluids being viscous or non-homogenous with means for comminuting, mixing stirring or otherwise treating
    • 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
    • F04D29/2244—Free vortex

Definitions

  • the invention relates to a centrifugal pump for conveying a solid admixed medium with a housing in which a free-flow impeller is arranged and a vane-free space is formed between the free-flow impeller and the inlet-side housing wall, wherein the free-flow impeller comprises a support disc, are formed on the blades, have the pressure side side surfaces, suction side side surfaces and front surfaces.
  • the impeller is flowed in radially on the inside.
  • the fluid flows radially outward from the impeller.
  • a radially inward flow is formed.
  • admixtures whose densities correspond approximately to the average density of the pumped liquid, or smaller, can accumulate on the center of the impeller. If this involves fibrous or textile admixtures, there is a risk that the residence time in the area of the center of the impeller may become so great that deposits build up. This can become one Clog the pump. Therefore, there are numerous versions of free-flow pumps, which are equipped with shredders.
  • a centrifugal pump is described with a pump impeller upstream crushing device for fibrous or lumpy admixtures in the fluid.
  • the comminution device is formed by a rotating with the pump impeller cutting head and a stationary in the housing of the centrifugal pump cutting ring. Due to the upstream shredding device, however, the space in front of the impeller is reduced and the inflow into the impeller is influenced. This can have a negative effect on the pump characteristic.
  • the WO 02/08610 A1 shows a shredder for sanitary purposes for a plant for pumping up sewage and solid waste.
  • the crusher is provided with a channel for supplying the water into a container, an electric motor whose shaft has at its end a pump with a rotor with blades and crushers which face a crushing chamber provided with an inlet opening.
  • the comminution means are formed by conical or oblique organs, which are arranged axially projecting with respect to the front side of the rotor.
  • Object of the present invention is to develop a centrifugal pump for the promotion of liquids with solid admixtures, are avoided in the blockages.
  • An attachment of fibrous components, such as textiles or films should be prevented.
  • the free passage through the pump should not be hindered.
  • the characteristic curve of the pump should not be adversely affected.
  • the blades are provided with cutting edges, wherein the cutting edges are formed at the contact lines where the front surfaces and the pressure side side surfaces meet.
  • the blades provided with cutting edges sever the solid Admixtures, so that it can not come to deposits. It is particularly advantageous if all or more blades are provided with cutting edges. In individual cases, however, it is sufficient if only one blade has a cutting edge.
  • cutting edges are formed at the locations where the front surfaces of the blades strike the side surfaces.
  • the impeller is a casting.
  • the contact points where the front surfaces and the side surfaces of the blades meet are not sharp in conventional free-stream pumps. There is no defined line of contact between the front surfaces and the side surfaces but there is an area in which the surfaces merge. The area is not defined sharp-edged but it is a rounded transition.
  • At least one surface of the blades is machined such that cutting edges are formed at the contact points of the surfaces.
  • the surfaces can be processed by grinding or planing.
  • the cutting action and the wear behavior can be improved by a local hardening of the cutting edges.
  • the front surfaces of the blades are machined to form cutting edges.
  • the front surfaces are prepared by grinding or planing so that cutting edges are formed.
  • the side surfaces of the blades are formed by the casting skin.
  • the front surfaces of the blades can only be provided with a chamfer.
  • the front surfaces of the blades are preferably chamfered in the areas where the front surfaces meet the pressure-side side surfaces of the blades.
  • the cutting or tearing effect of Cutting edges are supported by the casting roughness.
  • the hard casting skin counteracts the wear.
  • the surfaces forming the cutting edges are preferably at an angle smaller than 120 ° to each other. It proves to be advantageous if the surfaces which form the cutting edges are at an angle of less than 90 ° to each other.
  • the cutting edges are formed at the contact lines at which the front surfaces meet the pressure-side side surfaces.
  • the front surfaces of the blades are formed as winglets, which overlap the side surfaces.
  • the winglets are additional surfaces that are usually perpendicular to the blades.
  • the winglets improve the efficiency of the pump.
  • the winglets project beyond the suction-side side surfaces of the blades.
  • the winglets are provided with cutting edges. Impellers with winglets achieve their optimum effectiveness at very small blade angles. This is contrary to the cutting action. In addition, the winglets offer an additional area to which stable cutting edges can be attached.
  • blades are mounted on the winglets.
  • the blades are metal plates provided with cutting edges.
  • the blades are preferably screwed onto the winglets.
  • Another preferred variant of the invention is to provide the winglets with grooves.
  • the grooves are introduced on the inlet side surfaces of the winglets. Through the grooves are on the inlet side surface of the winglets Cutting edges generated. The cutting edges are formed at the contact lines where the side walls of the grooves meet the surface of the winglets.
  • the flat surface of the winglets can be provided with recesses.
  • the serrated grooves can be either circular or spiral.
  • the grooves preferably have a wedge-shaped cross-sectional profile.
  • a blade extension projects beyond the winglet surface. This blade extension points towards the inlet side housing wall.
  • These blade extensions can be over-turned or ground, so that cutting edges are formed in this way. Through induction hardening, the cutting edges can be additionally strengthened.
  • blades with flat outlet-side blade angles ⁇ are preferably used. It also proves to be beneficial to use impellers with a few blades, with a number of four or fewer blades has been found to be advantageous. Impellers with a shallow blade angle and a few blades are particularly well suited, as fibers slide radially outwards and are thereby comminuted. Free-flow impellers with a steep blade angle and many blades are less well suited, since sliding against the direction of rotation is difficult.
  • a centrifugal pump in whose housing 1 a free-flow impeller 2 is positioned.
  • the free stream wheel 2 is mounted on a shaft 3.
  • the attachment of the freewheel wheel 2 is a hub body 4, in which a screw 5 engages.
  • On the support disk 6 of the freewheel wheel 2 a plurality of blades 7 are arranged. Between the free stream wheel 2 and the inlet-side housing wall 8, a blade-free space 9 is formed.
  • a freewheel wheel 2 with cutting edges 14 is shown.
  • the free stream wheel 2 turns counterclockwise.
  • blades 7 are arranged.
  • Winglets 10 are formed.
  • the winglets 10 project beyond the suction-side side surfaces 11 of the blades 7.
  • the front surfaces 12 of the blades 7 are chamfered to the pressure-side side surface 13.
  • Cutting edges 14 are formed at the contact lines between the front surfaces 12 and the pressure-side side surfaces 13 of the blades 7.
  • Fig. 2b one recognizes an exit-side blade angle ⁇ .
  • the grooves 15 are recesses in the inlet-side surfaces of the winglets 10.
  • the grooves 15 can be introduced into the surfaces of the winglets in the form of notches.
  • the grooves 15 have a wedge-shaped cross-sectional profile.

Description

Die Erfindung betrifft eine Kreiselpumpe zur Förderung eines mit festen Beimengungen versetzten Mediums mit einem Gehäuse, in dem ein Freistromrad angeordnet ist und zwischen dem Freistromrad und der einlassseitigen Gehäusewand ein schaufelfreier Raum gebildet wird, wobei das Freistromrad eine Tragscheibe umfasst, auf der Schaufeln angeformt sind, die druckseitige Seitenflächen, saugseitige Seitenflächen und Vorderflächen aufweisen.The invention relates to a centrifugal pump for conveying a solid admixed medium with a housing in which a free-flow impeller is arranged and a vane-free space is formed between the free-flow impeller and the inlet-side housing wall, wherein the free-flow impeller comprises a support disc, are formed on the blades, have the pressure side side surfaces, suction side side surfaces and front surfaces.

Pumpen mit Freistromrädern weisen einen großen Abstand zwischen den Laufrad-Schaufeln und der einlassseitigen Gehäusewand auf, wodurch ein freier Raum gebildet wird. Dadurch wird die Mitförderung von festen Beimengungen ermöglicht, selbst dann, wenn die Beimengungen große Abmessungen haben.Pumps with free-flow wheels have a large distance between the impeller blades and the inlet-side housing wall, whereby a free space is formed. This allows the co-promotion of solid admixtures, even if the admixtures have large dimensions.

Das Laufrad wird radial innen angeströmt. Das Fluid strömt vom Laufrad radial nach außen ab. Im Raum zwischen Laufrad und einlassseitiger Gehäusewand bildet sich eine radial nach innen gerichtete Strömung. Dadurch können sich Beimengungen, deren Dichten in etwa der durchschnittlichen Dichte der Förderflüssigkeit entsprechen, oder kleiner ist, auf der Laufradmitte anlagern. Handelt es sich dabei um faserige oder textile Beimengungen, besteht die Gefahr, dass die Verweildauer im Bereich der Laufradmitte so groß wird, dass sich Anlagerungen aufbauen. Dies kann zu einem Verstopfen der Pumpe führen. Daher gibt es zahlreiche Ausführungen von Freistrompumpen, die mit Zerkleinerungseinrichtungen ausgestattet sind.The impeller is flowed in radially on the inside. The fluid flows radially outward from the impeller. In the space between the impeller and inlet-side housing wall, a radially inward flow is formed. As a result, admixtures whose densities correspond approximately to the average density of the pumped liquid, or smaller, can accumulate on the center of the impeller. If this involves fibrous or textile admixtures, there is a risk that the residence time in the area of the center of the impeller may become so great that deposits build up. This can become one Clog the pump. Therefore, there are numerous versions of free-flow pumps, which are equipped with shredders.

In der DE 103 05 726 A1 wird eine Kreiselpumpe mit einer dem Pumpenlaufrad vorgeschalteten Zerkleinerungseinrichtung für faserige oder stückige Beimengungen in der Förderflüssigkeit beschrieben. Die Zerkleinerungseinrichtung wird durch einen mit dem Pumpenlaufrad umlaufenden Schneidkopf und einem im Gehäuse der Kreiselpumpe feststehend angeordneten Schneidring gebildet. Durch die vorgeschaltete Zerkleinerungseinrichtung wird jedoch der Raum vor dem Laufrad verkleinert und die Zuströmung in das Laufrad beeinflusst. Dies kann sich negativ auf die Pumpenkennlinie auswirken.In the DE 103 05 726 A1 a centrifugal pump is described with a pump impeller upstream crushing device for fibrous or lumpy admixtures in the fluid. The comminution device is formed by a rotating with the pump impeller cutting head and a stationary in the housing of the centrifugal pump cutting ring. Due to the upstream shredding device, however, the space in front of the impeller is reduced and the inflow into the impeller is influenced. This can have a negative effect on the pump characteristic.

Die WO 02/08610 A1 zeigt einen Zerkleinerer für Sanitärzwecke für eine Anlage zum Hochpumpen von Abwässern und festen Abfällen. Der Zerkleinerer ist mit einem Kanal zur Zuführung des Wassers in einen Behälter, einem Elektromotor, dessen Welle an ihrem Ende eine Pumpe mit einem Rotor mit Schaufeln aufweist und Zerkleinerungsmitteln, welche einer mit einer Eintrittsöffnung versehenen Zerkleinerungskammer zugewandt sind, ausgestattet. Die Zerkleinerungsmittel sind durch konische oder schräge Organe gebildet, welche in Bezug auf die Vorderseite des Rotors axial vorspringend angeordnet sind.The WO 02/08610 A1 shows a shredder for sanitary purposes for a plant for pumping up sewage and solid waste. The crusher is provided with a channel for supplying the water into a container, an electric motor whose shaft has at its end a pump with a rotor with blades and crushers which face a crushing chamber provided with an inlet opening. The comminution means are formed by conical or oblique organs, which are arranged axially projecting with respect to the front side of the rotor.

Aufgabe der vorliegenden Erfindung ist es, eine Kreiselpumpe zur Förderung von Flüssigkeiten mit festen Beimengungen zu entwickeln, bei der Verstopfungen vermieden werden. Ein Anhängen von faserigen Bestandteilen, wie beispielsweise Textilien oder Folien, soll verhindert werden. Dabei soll der freie Durchgang durch die Pumpe nicht behindert werden. Weiterhin soll die Kennliniencharakteristik der Pumpe nicht negativ beeinflusst werden.Object of the present invention is to develop a centrifugal pump for the promotion of liquids with solid admixtures, are avoided in the blockages. An attachment of fibrous components, such as textiles or films should be prevented. The free passage through the pump should not be hindered. Furthermore, the characteristic curve of the pump should not be adversely affected.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, dass die Schaufeln mit Schneidkanten versehen sind, wobei die Schneidkanten an den Berührungslinien gebildet werden, wo die Vorderflächen und die druckseitigen Seitenflächen aufeinander treffen. Die mit Schneidkanten versehenen Schaufeln durchtrennen die festen Beimengungen, so dass es nicht zu Anlagerungen kommen kann. Dabei ist es besonders vorteilhaft, wenn alle oder mehrere Schaufeln mit Schneidkanten versehen sind. Im Einzelfall reicht es jedoch auch aus, wenn nur eine Schaufel eine Schneidkante aufweist.This object is achieved in that the blades are provided with cutting edges, wherein the cutting edges are formed at the contact lines where the front surfaces and the pressure side side surfaces meet. The blades provided with cutting edges sever the solid Admixtures, so that it can not come to deposits. It is particularly advantageous if all or more blades are provided with cutting edges. In individual cases, however, it is sufficient if only one blade has a cutting edge.

Gemäß der Erfindung werden Schneidkanten an den Stellen gebildet, an denen die Vorderflächen der Schaufeln auf die Seitenflächen treffen.According to the invention, cutting edges are formed at the locations where the front surfaces of the blades strike the side surfaces.

Üblicherweise handelt es sich bei dem Laufrad um ein Gussteil. Die Berührungsstellen an denen die Vorderflächen und die Seitenflächen der Schaufeln aufeinander treffen sind bei herkömmlichen Freistrompumpen nicht scharfkantig. Es gibt keine definierte Berührungslinie zwischen den Vorderflächen und den Seitenflächen sondern einen Bereich, in dem die Flächen ineinander übergehen. Der Bereich ist dabei nicht scharfkantig abgegrenzt sondern es handelt sich um einen abgerundeten Übergang.Usually, the impeller is a casting. The contact points where the front surfaces and the side surfaces of the blades meet are not sharp in conventional free-stream pumps. There is no defined line of contact between the front surfaces and the side surfaces but there is an area in which the surfaces merge. The area is not defined sharp-edged but it is a rounded transition.

Im Gegensatz zu herkömmlichen Schaufeln wird erfindungsgemäß zumindest eine Fläche der Schaufeln so bearbeitet, dass Schneidkanten an den Berührungsstellen der Flächen gebildet werden. Zur Bildung von Schneidkanten können die Flächen durch Anschleifen oder planes Andrehen bearbeitet werden. Zusätzlich können die Schneidwirkung und das Verschleißverhalten durch eine örtliche Härtung der Schneidkanten verbessert werden.In contrast to conventional blades, according to the invention at least one surface of the blades is machined such that cutting edges are formed at the contact points of the surfaces. To form cutting edges, the surfaces can be processed by grinding or planing. In addition, the cutting action and the wear behavior can be improved by a local hardening of the cutting edges.

In einer besonders vorteilhaften Ausführungsform der Erfindung werden zur Bildung von Schneidkanten die Vorderflächen der Schaufeln bearbeitet. Die Vorderflächen werden durch Anschleifen oder planes Andrehen so präpariert, dass Schneidkanten entstehen. Die Seitenflächen der Schaufeln werden von der Gusshaut gebildet.In a particularly advantageous embodiment of the invention, the front surfaces of the blades are machined to form cutting edges. The front surfaces are prepared by grinding or planing so that cutting edges are formed. The side surfaces of the blades are formed by the casting skin.

Um nicht die gesamte Planfläche bearbeiten zu müssen, können die Vorderflächen der Schaufeln lediglich mit einer Fase versehen werden. Die Vorderflächen der Schaufeln werden dabei vorzugsweise in den Bereichen angefast, wo die Vorderflächen auf die druckseitigen Seitenflächen der Schaufeln treffen. Die Schneid- oder Reißwirkung der Schneidkanten wird durch die Gussrauhigkeit unterstützt. Zusätzlich wirkt die harte Gusshaut dem Verschleiß entgegen.In order not to have to work the entire flat surface, the front surfaces of the blades can only be provided with a chamfer. The front surfaces of the blades are preferably chamfered in the areas where the front surfaces meet the pressure-side side surfaces of the blades. The cutting or tearing effect of Cutting edges are supported by the casting roughness. In addition, the hard casting skin counteracts the wear.

Die Flächen, welche die Schneidkanten bilden, stehen vorzugsweise in einem Winkel kleiner als 120 ° zueinander. Dabei erweist es sich als vorteilhaft, wenn die Flächen, welche die Schneidkanten bilden, in einem Winkel von weniger als 90 ° zueinander stehen.The surfaces forming the cutting edges are preferably at an angle smaller than 120 ° to each other. It proves to be advantageous if the surfaces which form the cutting edges are at an angle of less than 90 ° to each other.

Gemäß der Erfindung werden die Schneidkanten an den Berührungslinien gebildet, an denen die Vorderflächen auf die druckseitigen Seitenflächen treffen. Dadurch wird eine besonders wirkungsvolle Schneidwirkung der Kanten erzielt, da aufgrund der Drehrichtung des Laufrades die Beimengungen an die druckseitigen Seitenflächen gepresst werden.According to the invention, the cutting edges are formed at the contact lines at which the front surfaces meet the pressure-side side surfaces. As a result, a particularly effective cutting action of the edges is achieved because due to the direction of rotation of the impeller, the admixtures are pressed against the pressure-side side surfaces.

In einer vorteilhaften Ausführungsform der Erfindung sind die Vorderflächen der Schaufeln als Winglets ausgebildet, welche die Seitenflächen überlappen. Bei den Winglets handelt es sich um Zusatzflächen, die meist senkrecht auf den Schaufeln stehen. Durch die Winglets wird der Wirkungsgrad der Pumpe verbessert. Vorzugsweise überragen die Winglets die saugseitigen Seitenflächen der Schaufeln.In an advantageous embodiment of the invention, the front surfaces of the blades are formed as winglets, which overlap the side surfaces. The winglets are additional surfaces that are usually perpendicular to the blades. The winglets improve the efficiency of the pump. Preferably, the winglets project beyond the suction-side side surfaces of the blades.

Als besonders günstig erweist es sich, wenn die Winglets mit Schneidkanten versehen sind. Laufräder mit Winglets erreichen ihre optimale Wirksamkeit bei sehr kleinen Schaufelwinkeln. Dies kommt der Schneidwirkung entgegen. Zudem bieten die Winglets eine zusätzliche Fläche, an denen sich stabile Schneidkanten anbringen lassen.It proves to be particularly favorable if the winglets are provided with cutting edges. Impellers with winglets achieve their optimum effectiveness at very small blade angles. This is contrary to the cutting action. In addition, the winglets offer an additional area to which stable cutting edges can be attached.

In einer vorteilhaften Ausführung der Erfindung werden Klingen auf den Winglets befestigt. Bei den Klingen handelt es sich um Metallplättchen, die mit Schneidkanten versehen sind. Die Klingen werden vorzugsweise auf die Winglets aufgeschraubt.In an advantageous embodiment of the invention, blades are mounted on the winglets. The blades are metal plates provided with cutting edges. The blades are preferably screwed onto the winglets.

Eine weitere bevorzugte Variante der Erfindung besteht darin, die Winglets mit Rillen zu versehen. Die Rillen werden auf den einlassseitigen Oberflächen der Winglets eingebracht. Durch die Rillen werden auf der einlassseitigen Oberfläche der Winglets Schneidkanten erzeugt. Die Schneidkanten entstehen an den Berührungslinien, an denen die Seitenwände der Rillen auf die Oberfläche der Winglets treffen. Zur Bildung von Rillen kann die Planfläche der Winglets mit Eindrehungen versehen werden. Die kerbenförmigen Eindrehungen können entweder kreisförmig oder spiralförmig verlaufen. Die Rillen haben vorzugsweise ein keilförmiges Querschnittsprofil.Another preferred variant of the invention is to provide the winglets with grooves. The grooves are introduced on the inlet side surfaces of the winglets. Through the grooves are on the inlet side surface of the winglets Cutting edges generated. The cutting edges are formed at the contact lines where the side walls of the grooves meet the surface of the winglets. To form grooves, the flat surface of the winglets can be provided with recesses. The serrated grooves can be either circular or spiral. The grooves preferably have a wedge-shaped cross-sectional profile.

Bei einer bevorzugten Ausführungsform der Erfindung ragt eine Schaufelverlängerung über die Wingletfläche hinaus. Diese Schaufelverlängerung weist Richtung einlassseitiger Gehäusewand. Diese Schaufelverlängerungen können überdreht oder überschliffen werden, so dass auf diese Weise Schneidkanten gebildet werden. Durch Induktionshärten können die Schneidkanten zusätzlich gefestigt werden.In a preferred embodiment of the invention, a blade extension projects beyond the winglet surface. This blade extension points towards the inlet side housing wall. These blade extensions can be over-turned or ground, so that cutting edges are formed in this way. Through induction hardening, the cutting edges can be additionally strengthened.

Vorzugsweise werden bei der erfindungsgemäßen Kreiselpumpe Schaufeln mit flachen austrittsseitigen Schaufelwinkeln β eingesetzt. Auch erweist es sich als günstig, Laufräder mit wenigen Schaufeln einzusetzen, wobei sich eine Anzahl von vier oder weniger Schaufeln als vorteilhaft erwiesen hat. Laufräder mit einem flachen Schaufelwinkel und wenigen Schaufeln eignen sich besonders gut, da Fasern radial nach außen abgleiten und dabei zerkleinert werden. Freistromräder mit einem steilen Schaufelwinkel und vielen Schaufeln sind weniger gut geeignet, da ein Abgleiten entgegen der Drehrichtung erschwert wird.In the case of the centrifugal pump according to the invention, blades with flat outlet-side blade angles β are preferably used. It also proves to be beneficial to use impellers with a few blades, with a number of four or fewer blades has been found to be advantageous. Impellers with a shallow blade angle and a few blades are particularly well suited, as fibers slide radially outwards and are thereby comminuted. Free-flow impellers with a steep blade angle and many blades are less well suited, since sliding against the direction of rotation is difficult.

Weitere Merkmale und Vorteile der Erfindung ergeben sich anhand der Beschreibung von Ausführungsbeispielen, anhand von Zeichnungen und aus den Zeichnungen selbst. Dabei zeigt

Fig. 1
einen Schnitt durch eine Freistrompumpe,
Fig. 2
ein Freistromrad mit Winglets und angefaster Vorderfläche, a.) als Schnitt, b.) als Draufsicht, c.) in perspektivischer Darstellung,
Fig. 3
ein Freistromrad mit Winglets und einem kreisförmigen Rillenverlauf, a.) als Schnitt, b.) als Draufsicht, c.) in perspektivischer Darstellung,
Fig. 4
ein Freistromrad mit Winglets und einem spiralförmigen Rillenverlauf, a.) als Schnitt, b.) als Draufsicht, c.) in perspektivischer Darstellung.
Further features and advantages of the invention will become apparent from the description of exemplary embodiments, with reference to drawings and from the drawings themselves. It shows
Fig. 1
a section through a free-flow pump,
Fig. 2
a freestyle wheel with winglets and chamfered front surface, a.) as a section, b.) as a top view, c.) in a perspective view,
Fig. 3
a freestyle wheel with winglets and a circular groove course, a.) as a section, b.) as a plan view, c.) in a perspective view,
Fig. 4
a freestyle wheel with winglets and a spiral groove course, a.) as a section, b.) as a plan view, c.) in a perspective view.

In Fig. 1 ist eine Kreiselpumpe dargestellt, in deren Gehäuse 1 ein Freistromrad 2 positioniert ist. Das Freistromrad 2 ist auf einer Welle 3 befestigt. Der Befestigung des Freistromrades 2 dient ein Nabenkörper 4, in den eine Schraube 5 eingreift. Auf der Tragscheibe 6 des Freistromrades 2 sind mehrere Schaufeln 7 angeordnet. Zwischen dem Freistromrad 2 und der einlassseitigen Gehäusewand 8 wird ein schaufelfreier Raum 9 gebildet.In Fig. 1 a centrifugal pump is shown, in whose housing 1 a free-flow impeller 2 is positioned. The free stream wheel 2 is mounted on a shaft 3. The attachment of the freewheel wheel 2 is a hub body 4, in which a screw 5 engages. On the support disk 6 of the freewheel wheel 2 a plurality of blades 7 are arranged. Between the free stream wheel 2 and the inlet-side housing wall 8, a blade-free space 9 is formed.

In Fig. 2 ist ein Freistromrad 2 mit Schneidkanten 14 dargestellt. Das Freistromrad 2 dreht sich gegen den Uhrzeigersinn. Auf der Tragscheibe 6 sind Schaufeln 7 angeordnet. An dem einlassseitigen Ende der Schaufeln 7 sind Winglets 10 angeformt. Die Winglets 10 überragen die saugseitigen Seitenflächen 11 der Schaufeln 7. Die Vorderflächen 12 der Schaufeln 7 sind zur druckseitigen Seitenfläche 13 hin angefast. An den Berührungslinien zwischen den Vorderflächen 12 und den druckseitigen Seitenflächen 13 der Schaufeln 7 werden Schneidkanten 14 gebildet. In Fig. 2b erkennt man einen austrittsseitigen Schaufelwinkel β.In Fig. 2 a freewheel wheel 2 with cutting edges 14 is shown. The free stream wheel 2 turns counterclockwise. On the support plate 6 blades 7 are arranged. At the inlet end of the blades 7 Winglets 10 are formed. The winglets 10 project beyond the suction-side side surfaces 11 of the blades 7. The front surfaces 12 of the blades 7 are chamfered to the pressure-side side surface 13. Cutting edges 14 are formed at the contact lines between the front surfaces 12 and the pressure-side side surfaces 13 of the blades 7. In Fig. 2b one recognizes an exit-side blade angle β.

In den Fig. 3 und 4 sind auf den Winglets 10 Rillen 15 aufgebracht. Bei den Rillen 15 handelt es sich um Aussparungen, in den einlassseitigen Oberflächen der Winglets 10. Die Rillen 15 können in Form von kerbenförmigen Eindrehungen in die Oberflächen der Winglets eingebracht werden. Vorzugsweise haben die Rillen 15 ein keilförmiges Querschnittsprofil. Durch das Einbringen der Rillen 15 in die Winglets 10 werden Schneidkanten 14 auf der einlassseitigen Oberfläche der Winglets 10 gebildet. Die Schneidkanten 14 entstehen an den Berührungslinien zwischen den Seitenwänden 16 der Rillen 15 und der einlassseitigen Oberfläche der Winglets 10. In Fig. 3 haben die Rillen 15 einen kreisförmigen Verlauf. In Fig. 4 haben die Rillen einen spiralförmigen Verlauf.In the Fig. 3 and 4 are applied to the winglets 10 grooves 15. The grooves 15 are recesses in the inlet-side surfaces of the winglets 10. The grooves 15 can be introduced into the surfaces of the winglets in the form of notches. Preferably, the grooves 15 have a wedge-shaped cross-sectional profile. By introducing the grooves 15 into the winglets 10, cutting edges 14 are formed on the inlet side surface of the winglets 10. The cutting edges 14 are formed at the lines of contact between the side walls 16 of the grooves 15 and the inlet side surface of the winglets 10 Fig. 3 the grooves 15 have a circular course. In Fig. 4 the grooves have a spiral course.

Claims (8)

  1. Centrifugal pump for conveying a medium containing solid impurities, comprising a housing (1) in which a free-flow wheel (2) is disposed and a vane-free space (9) is formed between the free-flow wheel (2) and the inlet-side housing wall (8), the free-flow wheel (2) comprising a supporting disc (6) onto which vanes (7) having pressure-side side faces (13), suction-side side faces (11) and front faces (12) are formed, characterized in that the vanes (7) are provided with cutting edges (14) the cutting edges (14) being formed on the contact lines where the front faces (12) and the pressure-side side faces (13) meet.
  2. Centrifugal pump according to Claim 1, characterized in that the cutting edges (14) are formed by grinding of the front faces (12).
  3. Centrifugal pump according to Claim 1, characterized in that the cutting edges (14) are formed by lathing of the front faces (12).
  4. Centrifugal pump according to Claim 1, characterized in that the cutting edges (14) are formed by chamfering of the front faces (12) of the vanes (7), the front faces (12) being chamfered in the region where the front faces (12) meet the pressure-side side faces (13).
  5. Centrifugal pump according to Claim 1, characterized in that the faces (12, 13) which form the cutting edges (14) stand at an angle of less than 120°, preferably less than 90°, to each other.
  6. Centrifugal pump according to Claim 1, characterized in that the front faces (12) of the vanes (7) are configured as winglets (10), which project over the suction-side side faces (11) of the vanes (7).
  7. Centrifugal pump according to Claim 6, characterized in that blades with cutting edges (14) are fastened on the winglets (10).
  8. Centrifugal pump according to Claim 6, characterized in that the winglets (10) are provided with grooves (15) and, by the grooves (15) on the inlet-side surface of the winglets (10), cutting edges (14) are formed.
EP10001468.7A 2009-03-03 2010-02-12 Free flow impeller with cutting edges Active EP2226505B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102009011444A DE102009011444A1 (en) 2009-03-03 2009-03-03 Free-flow impeller with cutting edges

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EP2226505A1 EP2226505A1 (en) 2010-09-08
EP2226505B1 true EP2226505B1 (en) 2013-11-27

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EP (1) EP2226505B1 (en)
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DE (1) DE102009011444A1 (en)
DK (1) DK2226505T3 (en)
ES (1) ES2443550T3 (en)

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ITMI20130608A1 (en) * 2013-04-12 2014-10-13 Pompe Rotomec S R L IMPELLER FOR ANTI-CLOGGING AND HIGH HYDRAULIC PERFORMANCE PUMPS
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DE102015212653B4 (en) * 2015-07-07 2022-03-17 BSH Hausgeräte GmbH HOUSEHOLD APPLIANCE
CN105927581A (en) * 2016-06-29 2016-09-07 新界泵业集团股份有限公司 Cutting type impeller suitable for submersible electric pump
DE102016225908A1 (en) 2016-12-21 2018-06-21 KSB SE & Co. KGaA Vortex pump
IT201900010632A1 (en) * 2019-07-02 2021-01-02 Dab Pumps Spa IMPELLER PERFECTED FOR CENTRIFUGAL PUMP, ESPECIALLY FOR PUMP WITH RETRACTABLE IMPELLER TYPE, AND PUMP WITH A SIMILAR IMPELLER
CN114151380B (en) * 2021-11-15 2024-01-09 中交疏浚技术装备国家工程研究中心有限公司 Antiwind swirl pump with clearance bath

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Publication number Publication date
CN101825089A (en) 2010-09-08
CN101825089B (en) 2014-08-13
DE102009011444A1 (en) 2010-09-09
ES2443550T3 (en) 2014-02-19
EP2226505A1 (en) 2010-09-08
DK2226505T3 (en) 2014-01-27

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