EP1747377B1 - Laufrad - Google Patents

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Publication number
EP1747377B1
EP1747377B1 EP05732227A EP05732227A EP1747377B1 EP 1747377 B1 EP1747377 B1 EP 1747377B1 EP 05732227 A EP05732227 A EP 05732227A EP 05732227 A EP05732227 A EP 05732227A EP 1747377 B1 EP1747377 B1 EP 1747377B1
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EP
European Patent Office
Prior art keywords
hub
blade
channel
channel impeller
impeller
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP05732227A
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English (en)
French (fr)
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EP1747377A1 (de
Inventor
Axel Fredriksson
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PUMPEX PRODUCTION AB
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PUMPEX PRODUCTION AB
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/18—Rotors
    • F04D29/22—Rotors specially for centrifugal pumps
    • F04D29/2238—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
    • 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
    • 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
    • F04D29/24—Vanes
    • F04D29/242—Geometry, shape
    • F04D29/245—Geometry, shape for special effects
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2240/00—Components
    • F05D2240/20—Rotors
    • F05D2240/30—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor
    • F05D2240/303—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor related to the leading edge of a rotor blade

Definitions

  • the invention relates to a channel impeller of the open or half-open type for a centrifugal pump for wastewater, said channel impeller having a substantially circular periphery.
  • the channel impeller comprises a central hub with a hub axis and a hub plane to which the hub axis extends perpendicularly.
  • the channel impeller further comprises at least one blade which extends from the hub to the periphery, said blade having a front edge adjacent to the hub, such as disclosed in US 1763595 .
  • the invention also relates to a centrifugal pump which comprises a pump casing with a channel impeller.
  • the invention relates to open or half-open channel impellers.
  • a half-open channel impeller is limited inwards to the drive shaft by a hub plate on which the blade or blades is/are mounted. Outwards to the inlet, the blades are arranged to cooperate with a stationary wear plate. The distance from the blades to the wear plate is often less than 0.5 cm to provide good efficiency.
  • the blades of a so-called closed channel impeller are mounted on co-rotating hub plates both inwards and outwards.
  • EP 0 406 788 discloses a centrifugal pump which comprises a pump casing with an impeller in the form of a half-open channel impeller.
  • the channel impeller comprises several blades on which blade projections are arranged.
  • a wear plate is mounted at a constant distance from the blade projections.
  • Such blade projections reduce the flow from the high-pressure side of the blades to the low-pressure side of the blades in operation. As a result, the efficiency of the pump is improved compared with a pump without blade projections.
  • the blades are made of bent sheet metal and mounted on a hub plate of metal sheet.
  • the hub plate has a hub projecting a distance which is the same as the height of the blades from the hub plate.
  • the blades further have a front edge facing the hub.
  • An object of the present invention is to provide an open or half-open channel impeller for a centrifugal pump which has improved clogging properties compared with the prior-art channel impeller.
  • Another object of the present invention is to provide a centrifugal pump comprising an open or half-open channel impeller which has improved clogging properties compared with the prior-art channel impeller.
  • the invention is thus based on the knowledge that the design of the front edge is important to the clogging properties.
  • the front edge of the blade relates to the edge that divides the liquid flow at the inlet of the pump.
  • the channel impeller according to the present invention and the centrifugal pump according to the present invention are adapted to be used for pumping liquid of a type that consists of wastewater.
  • wastewater relates to contaminated water which is passed to waste.
  • wastewater from domestic toilets, bath, washing-up and washing referred to as black water and grey water respectively.
  • Wastewater can also be industrial wastewater from industrial processes.
  • the invention aims particularly at improving the clogging tendency of a channel impeller with regard to wastewater containing flexible, elongate pieces of material, such as elongate textile or plastic threads, dishcloths or residues from the paper industry.
  • channel impellers have been constructed so that a rigid object of a predetermined maximum size should be able to pass through the channels of the channel impeller. If it has traditionally been desired to improve the clogging properties of a channel impeller, the dimensions of the channels have thus been increased so that a larger, rigid object can pass therethrough. According to the invention, it has however been realised that it is often longer, flexible objects, such as cloths, bands or fibre material, that get caught by an unfavourably designed front edge and stick thereto. Since other flexible objects then get stuck to the flexible object that has already got stuck, the throughput of the pump will quickly be made smaller. This means that even relatively small, rigid objects will be prevented from passing through the channels of the channel impeller and the flow decreases. If it would be possible to design the front edge so as to reduce the tendency of flexible objects getting stuck, it will also be easier for rigid objects to pass through the channel impeller. It would thus be possible to improve the throughput of a channel impeller without increasing the dimensions of the channels.
  • this is achieved by a front edge which is inclined 50° maximum to a hub plane.
  • a front edge which is inclined 40° maximum is preferred. With a steeper front edge, elongate flexible objects tend to get caught on the edge and get stuck. If the channel impeller has a projecting hub, it is also common for flexible objects to slide down along an excessively steep front edge and wind onto the hub.
  • hub plane relates to a plane including the hub of the channel impeller.
  • the hub is connected to a drive shaft.
  • the channel impeller rotates on an axis, referred to as the hub axis, which coincides with the drive shaft.
  • the hub plane constitutes a plane perpendicular to the drive shaft/hub axis. If the hub plate of a half-open channel impeller is flat, the hub plane is parallel to this. If the inner wear plate of an open channel impeller is flat, the hub plane is parallel to this.
  • the front edge further has the shape of an even curve, i.e. the shape of a curve without discontinuities, such as steps or sharp corners on which a flexible object could be caught.
  • the exact shape of a curve of the front edge relative to the hub plane is determined by the shape of the blade in other directions, which is determined by other factors, such as power requirements and degree of efficiency.
  • the front edge should not at any point have an inclination that exceeds 50° to the hub plane.
  • the front edge can have a convex or concave shape relative to the hub plane. It can also be curved, for instance in the shape of an S or a double S. It is also possible to have a front edge which is substantially rectilinear.
  • the front edge of the blade extends between a lower inner end and an upper outer end.
  • the inner end of the blade is positioned closer to the hub than the outer end and is the portion of the blade which is closest to the hub.
  • the inner end is further positioned closer to the rear inner wear plate and the hub plate than is the outer end.
  • the front edge of the blade thus extends between the inner end and the outer end and has over the whole of this portion an inclination of 50° maximum.
  • the blade further comprises an outer edge side, which is arranged to cooperate with a wear plate.
  • the outer edge side of the blade and the wear plate are adjusted to each other so that the blade and the wear plate have the desired distance from each other as the channel impeller rotates.
  • the wear plate can be flat, cup-shaped or have any other rotationally symmetrical shape that corresponds to the outer edge side of the blade.
  • the front edge passes into the outer edge side of the blade.
  • This portion of the blade constitutes a transition portion.
  • the transition portion is limited by the outer end of the front edge and by the outer edge side of the blade from the point where the outer edge side is adapted to cooperate with the wear plate.
  • the wear plate is provided with a central inlet, which is intended as the inlet for the liquid to be pumped.
  • the liquid then flows on into the channels of the channel impeller.
  • the transition portion has the shape of an even curve.
  • the transition portion has a radius of curvature relative to the hub plane of at least 20 mm and suitably at least 30 mm.
  • a radius of curvature of at least 50 mm is preferred.
  • the radius of curvature should be 200 mm maximum, preferably less than 150 mm, and a radius of curvature of less than 100 mm is preferred.
  • the transition between the front edge and the outer edge side will be smooth so that the risk of flexible objects getting stuck is minimised.
  • the objects can instead slide into a channel or leave through the gap between the blade and the wear plate.
  • the transition portion of the blade with the outer end of the front edge of the blade is positioned at the periphery of the inlet of the wear plate. In this way, the entire inlet area of the front edge of the blade is utilised, thereby making it possible to achieve a minor inclination of the front edge relative to the hub plane.
  • the hub extends in the hub axis direction, i.e. the hub projects outwards to the inlet. Then the hub has an outer terminal edge which is positioned at a distance from a rear plate, i.e. the rear wear plate of an open channel impeller or the hub plate of a half-open channel impeller.
  • the blade has an inner edge side which is opposite to the outer edge side facing the wear plate.
  • the inner edge side of the blade follows the rear plate from the periphery of the channel impeller to the hub and then abuts against the hub. This means that a portion of the inner edge side of the blade is mounted on the hub.
  • the inner end of the front edge of the blade will then be placed at the outer edge side of the hub.
  • the inner end of the front edge of the blade is positioned closer to the inlet than the inner edge side of the blade adjacent to the rear plate. This means that it is advantageously possible to have the inclination of the front edge relative to the hub plane smaller than in an embodiment where the inner end of the front edge of the blade is positioned adjacent to the rear plate.
  • the projecting hub has the shape of an even curve to obtain good flow properties and also to prevent flexible objects from getting stuck on the hub or in the contact points of the blades.
  • the hub has, for example, a rotationally symmetrical shape with an increasing diameter towards the hub plate, so that the hub will be levelled adjacent to the hub plate.
  • the inclination of the front edge by changing the size of the inlet, thereby moving the position of the outer end of the front edge, and by changing the extent of the hub towards the inlet, thereby moving the position of the inner end of the front edge.
  • a moderate size of the inlet limits the inclination of the front edge to at least 20° or 25°, preferably at least 30°. In other words, the front edge does not at any point have an inclination which is less than 20°.
  • the outer edge side of the blade is provided with a blade projection.
  • a blade projection is a flange-shaped component which projects from the principal plane of the blade and which mainly has its extent in a hub plane.
  • the blade projection has a width perpendicular to the blade.
  • the blade projection is arranged to cooperate with the wear plate in the same way as the outer edge side in an embodiment without blade projections.
  • the blade projection can be flat in order to cooperate with a flat wear plate or have any other shape adapted to the wear plate.
  • the blade projection and the wear plate are adjusted to each other so that the blade projection and the wear plate have the desired distance from each other as the channel impeller rotates.
  • Open or half-open channel impellers are provided with blade projections for better efficiency.
  • the blade projection makes it difficult for the pumped liquid to pass through the gap between the blade and wear plate.
  • the blade projection extends substantially along the entire outer edge side from the hub to the periphery. At the end of the outer edge side which is closest to the hub, the width of the blade projection decreases down to the thickness of the edge side and connects to the front edge with the shape of an even convex curve. This reduces the risk that a flexible object gets stuck to the inner end of the blade projection.
  • An embodiment of the present invention which, in addition to having a front edge which is inclined 50° maximum, also has a transition portion with a radius of curvature relative to the hub plane of at least 20 mm and a blade projection which connects to the transition portion with the shape of an even convex curve, thus advantageously has no sharp edges oriented towards the flow direction, to which a flexible object could get stuck.
  • the blade projection can project in both directions or only one direction from the outer edge side of the blade. In one embodiment of the invention, the blade projection projects from the outer edge side only on the high-pressure side of the blade.
  • the channels of the channel impeller are limited on the one hand by the rear plate and the wear plate and, on the other, by at least one blade. There is a distance from the edge side of the blade projection to a blade projection on an opposite blade portion belonging to the same or an adjoining blade. If the blade projection is of a type which projects only on the high-pressure side of the blade, there is a corresponding distance between the edge side of the blade projection and an opposite blade portion belonging to the same or an adjoining blade.
  • said distance is constant or increases from the hub to the periphery. As a result, there is no projecting portion to which a flexible object could get stuck.
  • the channel impeller comprises a plurality of blades, for instance two to five blades.
  • One embodiment comprises two blades.
  • the blades can be uniform or be differently dimensioned.
  • the wear plate must then, of course, be adjusted to the maximum axial dimension along each circumference.
  • the blades are arranged in an angularly symmetrical manner.
  • Fig. 1 shows a half-open channel impeller which is intended for use in a pump for pumping of wastewater.
  • the channel impeller has two blades 1 and a circular hub plate 2 with a periphery 3.
  • Two channels 17 are formed between the blades 1, the hub plate 2 and a wear plate not shown in Fig. 1 .
  • Centrally in the hub plate there is a hub 4 to be mounted on a drive shaft which coincides with a hub axis 5.
  • the hub plate 2 is in the shown embodiment flat and located in a hub plane, which is a plane perpendicular to the hub axis 5.
  • the blades 1 extend from the hub 4 to the periphery 3 and are swept back. The blades 1 thus do not extend in a straight radial direction but curve away from the hub 4 to the periphery 3 like a part of a spiral.
  • Each blade 1 comprises a web 6 projecting from the hub plate 2 and having a high-pressure side 7 and a low-pressure side 8.
  • the blade 1 further has an outer edge side which faces away from the hub plate 2 and is provided with a blade projection 9.
  • the blade projection 9 projects from the web 6 of the blade on the high-pressure side 7 only.
  • the hub 4 projects from the hub plate 2 on the side of the blades 1 toward the hub plate 2 a distance that corresponds to a part of the height of the web 6.
  • the hub 4 has an outer terminal edge 10 facing away from the hub plate 2.
  • the hub 4 forms a rotationally symmetrical body and has an increasing diameter from the terminal edge 10 towards the hub plate 2.
  • Each blade 1 comprises a front edge 11, i.e. the portion of the blade 1 that divides the flow when using the impeller in a pump.
  • the front edge 11 extends between an outer end 13 adjacent to the blade projection 9 and an inner end 12 adjacent to the hub 4.
  • each blade 1 has an inner edge side which is connected to the hub plate 2. Adjacent to the hub 4, the inner edge side follows and abuts against the rotationally symmetrical body of the hub 4. The inner end 12 of the front edge 11 is thus located at the terminal edge 10 of the hub.
  • the front edge 11 forms between its inner end 12 and its outer end 13 a three-dimensional continuous curve.
  • the front edge 11 further has a substantially constant inclination of 33° to the hub plane.
  • Fig. 8 illustrates the inclination g of the front edge 11 to the hub plane.
  • transition portion 14 At the outer end 13 of the front edge 11, there is a transition portion 14 to the blade projection 9.
  • This transition portion 14 forms a continuous, convex, three-dimensional curve.
  • the transition portion 14 has a substantially constant radius of curvature of 75 mm relative to the hub plane.
  • the blade projection 9 connects with the shape of a continuous curve to the transition portion 14.
  • Each blade projection 9 extends in a plane which is parallel to the hub plane and substantially perpendicular to the web 6.
  • the blade projection 9 has an edge side 15 facing away from the web 6.
  • the blade projection is dimensioned so that a distance 16 from the edge side 15 to the web of the opposite blade increases from closest to the hub 4 to the periphery 3.
  • the channel impeller is adapted to cooperate with a wear plate 23 not shown in Fig. 1 , cf. instead Fig. 9 .
  • the wear plate 23 is provided with a circular inlet with a radius which is the same as the distance from the hub axis 5 to the transition portion 14.
  • the front edge 11 of the blade 1 is designed in such a manner that, in consideration of the inlet of the wear plate 23, there is no steep edge or no projecting portion in the flow direction when the channel impeller is used in a pump, and therefore elongate flexible objects do not get stuck but slide into one of the channels 17. Moreover there is sufficient space between the blades 1 and the hub 4 for rigid objects, that are usually present in wastewater, to pass. Owing to the distance 16 increasing along the channel 17, objects cannot be wedged between the blade projections 9 and an opposite blade 1 either.
  • Figs 2-7 illustrate alternative embodiments of the present invention. These embodiments are designed in essentially the same way as the one described with reference to Fig. 1 and only the differences will in the following be explained in more detail.
  • equivalent components are provided with the same reference numerals as in Fig. 1 .
  • Figs 2 and 3 shown half-open channel impellers of the same type as the one described with reference to Fig. 1 .
  • the channel impeller according to Fig. 2 has, however, a steeper front edge 11 than does the channel impeller according to the first embodiment in Fig. 1 .
  • the front edge 11 shown in Fig. 2 has an inclination of 45° relative to the hub plane.
  • the channel impeller according to Fig. 2 is adapted to cooperate with a wear plate 23 whose inlet has a smaller diameter than the wear plate 23 with which the channel impeller according to the first embodiment is adapted to cooperate.
  • the channel impeller according to Fig. 3 has a less steep front edge 11 than does the channel impeller according to the first embodiment.
  • the channel impeller according to Fig. 3 is adapted to cooperate with a wear plate 23 whose inlet has a greater diameter than the wear plate 23 with which the first embodiment of the channel impeller is adapted to cooperate.
  • Fig. 4 shows an embodiment of a half-open channel impeller without blade projections 9.
  • this embodiment also lacks a connecting portion for a blade projection 9 adjacent to the transition portion 14 of the front edge 11.
  • the front edge 11 and the transition portion 14 are designed in the same way as in the first embodiment of the channel impeller.
  • Fig. 5 shows a fifth embodiment of a half-open channel impeller according to the invention. This differs from the channel impeller according the first embodiment by each blade projection 9 projecting from the respective blades 1 on the low-pressure side 8. Thus the blade projections 9 connect to the respective transition portions 14 from the low-pressure side with the shape of an even curve. Also in this embodiment, the distance 16 between the edge side 15 of the blade projection of one blade 1 and the web 6 of the opposite blade 1 increases from the hub 4 to the periphery 3. Here is meant the distance from the high-pressure side of the web 6 of the opposite blade 1.
  • Fig. 6 shows a sixth embodiment having three blades 1. Each blade 1 is designed in the same way as the blades 1 in the first embodiment. Also in this sixth embodiment, a distance 16 between the edge side 15 of a blade projection 9 and the web 6 of the opposite blade 1 increases from the hub 4 to the periphery 3.
  • Fig. 7 illustrates a seventh embodiment of the present invention in the form of an open channel impeller with two blades 1.
  • This channel impeller lacks blade projections 9 and a hub plate 2.
  • the channel impeller has a hub 4 which resembles the hub 4 in the first embodiment.
  • the hub is positioned in a hub plane which is a plane perpendicular to a hub axis 5.
  • Each blade 1. has a web 6 with an inner edge side 19 and an outer edge side 18.
  • Each blade 1 also has an end 20 facing radially away from the hub 4.
  • the inner edge side 19 is adapted to cooperate with an inner wear plate, a rear plate, and the outer edge side 18 is adapted to cooperate with an outer wear plate with an inlet (not shown).
  • Two channels 17 are formed between the wear plates and the blades 1.
  • this channel impeller can be said to comprise a periphery 3, viz. the circumference of a circle with its centre on the hub axis and extending through the ends 20 of the blades 1. That part of the inner edge side 19 of each blade 1 which abuts against the hub 4, the front edge 11 and the transition portion 14 of each blade are designed in the same way as in the first embodiment.
  • Fig. 9 shows a pump casing 24 according to the present invention with a half-open channel impeller according to the first embodiment of the present invention.
  • the pump casing 24 accommodates a wear plate 23 with an inlet for the entering flow 21.
  • the channel impeller is provided with two blades 1, which each have a blade projection 9 projecting on the high-pressure side.
  • the channel impeller is arranged in the pump casing so that the blade projections have a distance of less than 50 mm to the wear plate 23.
  • the pump casing also comprises an outlet for the escaping flow 22.

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

Claims (11)

  1. Kanalpumpenrad vom offenen oder halboffenen Typ für eine Zentrifugalpumpe für Abwasser, wobei das Kanalpumpenrad einen im Wesentlichen kreisförmigen äußeren Rand (3) hat, eine mittige Nabe (4) mit einer Nabenachse (5) und einer Nabenebene, zu der die Nabenachse (5) senkrecht verläuft, sowie wenigstens einen Flügel (1) umfasst, der sich von der Nabe (4) zu dem äußeren Rand (3) erstreckt, und der Flügel (1) eine Vorderkante (11) an die Nabe (4) angrenzend aufweist, dadurch gekennzeichnet, dass die Vorderkante (11) des Flügels (1) mit einer Neigung zu der Nabenebene, die minimal 20° und maximal 50° beträgt, kontinuierlich gekrümmt ist.
  2. Kanalpumpenrad nach Anspruch 1, wobei der Flügel (1) des Weiteren eine Außenkantenseite umfasst, die so angeordnet ist, dass sie mit einer Reibplatte (23) zusammenwirkt, die Vorderkante (11) des Flügels (1) ein äußeres Ende (13) umfasst und ein Übergangsabschnitt (14) zwischen dem äußeren Ende (13) der Vorderkante (11) und der Außenkantenseite vorhanden ist.
  3. Kanalpumpenrad nach Anspruch 2, wobei der Übergangsabschnitt (14) mit einem Krümmungsradius relativ zu der Nabenebene von wenigstens 20 mm kontinuierlich gekrümmt ist.
  4. Kanalpumpenrad nach Anspruch 2 oder 3, wobei die Reibplatte (23) einen mittigen Einlass hat und der Übergangsabschnitt (14) am äußeren Rand des Einlasses der Reibplatte angeordnet ist.
  5. Kanalpumpenrad nach einem der Ansprüche 2-4, wobei sich die Nabe (4) in der Nabenachsenrichtung erstreckt und der Flügel (1) einen inneren Abschnitt hat, der an der Nabe (4) so anliegt, dass das innere Ende (12) der Vorderkante (11) des Flügels (1) an der äußeren Abschlusskante (10) der Nabe (4) angeordnet ist.
  6. Kanalpumpenrad nach Anspruch 5, wobei der Flügel (1) wenigstens einen Kanal (17) zwischen einer hinteren Platte und der Reibplatte (23) bildet, sich der Kanal (17) radial und in Umfangsrichtung von der Nabe (4) zu dem äußeren Rand (3) erstreckt und die Nabe (4) nur soweit vorsteht und der Kanal (17) so bemessen ist, dass eine Kugel mit einem Durchmesser von 60 mm durch den Kanal (17) hindurch gelangen kann.
  7. Kanalpumpenrad nach einem der Ansprüche 2-6, wobei die Außenkantenseite mit einem Flügelvorsprung (9) versehen ist, der so angeordnet ist, dass er mit der Reibplatte (23) zusammenwirkt, und der mit der Form einer kontinuierlichen Krümmung mit dem Übergangsabschnitt (14) verbunden ist.
  8. Kanalpumpenrad nach Anspruch 7, wobei der Flügelvorsprung (9) wenigstens eine Kante (15) hat, jede Kante (15) kontinuierlich gekrümmt und so bemessen ist, dass der Abstand (16) von jeder Kante (15) zu einer Kante (15) oder Fläche eines gegenüberliegenden Flügelabschnitts konstant ist oder entlang des Flügels (1) von der Nabe (4) zu dem äußeren Rand (3) zunimmt.
  9. Kanalpumpenrad nach Anspruch 7 oder 8, wobei der Flügelvorsprung (9) nur an der Hochdruckseite (7) des Flügels (1) vorsteht.
  10. Kanalpumpenrad nach einem der Ansprüche 1-9, wobei der wenigstens eine Flügel (1) aus zwei oder drei Flügeln (1) besteht, die einheitlich sind und einheitlich rotationssymmetrisch verteilt sind.
  11. Zentrifugalpumpe für Abwasser, die ein Pumpengehäuse (24) mit einem Kanalpumpenrad nach Anspruch 1 umfasst.
EP05732227A 2004-04-15 2005-04-14 Laufrad Not-in-force EP1747377B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0400964A SE526557C2 (sv) 2004-04-15 2004-04-15 Kanalhjul
PCT/SE2005/000541 WO2005100796A1 (en) 2004-04-15 2005-04-14 Impeller

Publications (2)

Publication Number Publication Date
EP1747377A1 EP1747377A1 (de) 2007-01-31
EP1747377B1 true EP1747377B1 (de) 2009-01-21

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EP05732227A Not-in-force EP1747377B1 (de) 2004-04-15 2005-04-14 Laufrad

Country Status (5)

Country Link
EP (1) EP1747377B1 (de)
AT (1) ATE421638T1 (de)
DE (1) DE602005012498D1 (de)
SE (1) SE526557C2 (de)
WO (1) WO2005100796A1 (de)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012023731B4 (de) * 2012-12-05 2021-03-11 Wilo Se Kreiselpumpe insbesondere für Abwasser oder Schmutzwasser
ITMI20130608A1 (it) * 2013-04-12 2014-10-13 Pompe Rotomec S R L Girante per pompe del tipo anti-intasamento e ad alto rendimento idraulico
DK2908012T3 (en) 2014-01-24 2019-04-01 Mcfinn Tech Radial impeller and centrifugal pump housing
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WO2005100796A1 (en) 2005-10-27
SE0400964L (sv) 2005-10-11
DE602005012498D1 (de) 2009-03-12
SE526557C2 (sv) 2005-10-11
SE0400964D0 (sv) 2004-04-15
EP1747377A1 (de) 2007-01-31
ATE421638T1 (de) 2009-02-15

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