EP3779201B1 - Élément de raclage pour bords d'attaque de roue à aubes pour des pompes à eau - Google Patents

Élément de raclage pour bords d'attaque de roue à aubes pour des pompes à eau Download PDF

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Publication number
EP3779201B1
EP3779201B1 EP19191970.3A EP19191970A EP3779201B1 EP 3779201 B1 EP3779201 B1 EP 3779201B1 EP 19191970 A EP19191970 A EP 19191970A EP 3779201 B1 EP3779201 B1 EP 3779201B1
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EP
European Patent Office
Prior art keywords
finger
rotation
angle
axis
housing
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.)
Active
Application number
EP19191970.3A
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German (de)
English (en)
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EP3779201C0 (fr
EP3779201A1 (fr
Inventor
Christoph Jäger
Mateusz Kaminski
Enrico MÜLLER
Nicolas Petit
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
KSB SE and Co KGaA
Original Assignee
KSB SE and Co KGaA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to HUE19191970A priority Critical patent/HUE062508T2/hu
Application filed by KSB SE and Co KGaA filed Critical KSB SE and Co KGaA
Priority to EP19191970.3A priority patent/EP3779201B1/fr
Priority to PCT/EP2020/071792 priority patent/WO2021028246A1/fr
Priority to US17/635,236 priority patent/US12044252B2/en
Priority to AU2020327570A priority patent/AU2020327570A1/en
Priority to BR112022002294A priority patent/BR112022002294A2/pt
Priority to CN202080057382.5A priority patent/CN114245849B/zh
Priority to CA3149426A priority patent/CA3149426A1/fr
Publication of EP3779201A1 publication Critical patent/EP3779201A1/fr
Priority to SA522431683A priority patent/SA522431683B1/ar
Application granted granted Critical
Publication of EP3779201C0 publication Critical patent/EP3779201C0/fr
Publication of EP3779201B1 publication Critical patent/EP3779201B1/fr
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Anticipated expiration legal-status Critical

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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
    • 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
    • F04D29/2261—Rotors specially for centrifugal pumps with special measures
    • F04D29/2288—Rotors specially for centrifugal pumps with special measures for comminuting, mixing or separating
    • 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
    • F04D29/70—Suction grids; Strainers; Dust separation; Cleaning
    • F04D29/708—Suction grids; Strainers; Dust separation; Cleaning specially for liquid pumps
    • 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

Definitions

  • the invention relates to a sewage pump with a volute housing with an inlet opening and an impeller with at least one blade, the leading edge associated with the respective blade running outwards from the impeller hub and curved backwards.
  • Wastewater can contain different types of solids such as fibrous matter, the amount and structure of which can depend on the wastewater source as well as the time of year. For example, plastics, hygiene items, textiles, etc. are common in cities, while wear and tear particles may be present in industrial areas.
  • fibrous materials such as rags, cloths and the like, which can get stuck on the leading edges of the blades and wrap around the impeller hub. Such incidents result in frequent service intervals and reduced pump efficiency.
  • the U.S. 2009/123270 A1 discloses a sewage pump for pumping solids-laden sewage with a finger for scraping dirt.
  • the aim of the present invention is to improve existing solutions.
  • the starting point for the invention is a sewage pump for pumping sewage containing solids.
  • the sewage pump consists of an impeller with at least one backward-curved impeller blade.
  • the impeller is non-rotatably connected to a rotating shaft and sits in a volute-shaped pump casing with an inlet port.
  • the inlet port may be axially aligned and/or cylindrical.
  • the leading edge of the at least one impeller blade extends radially outwards from the impeller hub with the aforementioned backward-curved blade shape.
  • a finger is firmly connected to the pump housing on the inner wall of the inlet opening. In the area of the transition from the finger to the inner wall of the inlet opening, there is a groove which is formed in the suction-side side wall of the pump housing and runs outwards in the radial and tangential direction in the pump housing wall.
  • the finger extends radially inward from the inlet inner wall toward the axis of rotation of the impeller.
  • An upper finger surface facing the leading edge runs at a defined distance from the leading edge and essentially parallel to the leading edge, so that the upper finger surface facing the leading edge or the lateral contact surface of the finger results in the desired wiping effect.
  • the interaction of the backward curved leading edge and fingers favors the removal of solids stuck on the impeller leading edge.
  • the deposited solids are fed into the groove and conveyed by the rotational movement of the impeller, so that they reach the area of the casing pressure nozzle directly via the groove.
  • the impeller and the finger are specially matched to each other for this task.
  • the impeller leading edge is set at an angle ⁇ of 5° to 75° to the vertical projection surface of the axis of rotation of the impeller is.
  • an axial component also has an effect on the solids when scraping off the solids. This optimizes the removal of the scraped solids through the groove.
  • the angle ⁇ can preferably lie in a value range between 10° and 45°.
  • the upper finger surface of the finger can also be inclined by the angle ⁇ with respect to the vertical projection surface to almost the same extent.
  • the upper finger surface and the leading edge do not necessarily have to run exactly parallel, so that deviating angles ⁇ to the projection surface are also conceivable here.
  • the upper finger surface is not planar but curved instead, so that a varying angle a for the finger surface and consequently also a varying distance between the leading edge and the upper finger surface can result.
  • the upper finger surface can preferably provide a curvature both in the radial and in the tangential direction. Ideally, the upper finger surface has a cone-like curvature in the radial and tangential direction.
  • the sewage pump can be operated both dry and submerged in the pumping medium in any orientation.
  • the volute casing of the pump has a spur and a pressure port.
  • the pump housing can have a separate housing insert, such as a suction cover or a wear wall, into which the aforementioned groove can be introduced or the finger can be attached to it.
  • the leading edge of the at least one blade moves past the upper finger surface at an angle ⁇ to the lateral contact surface of the finger.
  • this angle ⁇ should be around 90° in order to achieve an optimal scraping effect.
  • the angle ⁇ should increase outwards in the radial direction. This means that as the radius increases (starting from the impeller hub), the angle ⁇ should also increase.
  • the radius r suction corresponds to the radius of the cylindrical inlet opening of the housing.
  • the angle between the aforementioned support points can vary essentially uniformly, ideally the angle between the support points should increase steadily.
  • the upper finger surface of the finger is at a distance of 0.05 to 3 mm from the leading edge of the blade, at least in some areas. This ensures optimal scraping of the solids from the impeller inlet edge. If the distance is too large, there is a risk that small solids and fibers will not be caught by the scraper finger.
  • the lateral contact surface of the finger or a tangent to the contact surface to have a (tangential) angle ⁇ in relation to the tangential course of the groove with a value between 120° and 180°, preferably between 140° and 180° and particularly preferably a value between 160 ° and 180°.
  • the rule here is that as the angle ⁇ increases, the discharge of the scraped-off solids into the groove is made easier. An angle ⁇ of 180° would be ideal.
  • the finger In order to influence the flow in the impeller inlet as little as possible, the finger should have a streamlined shape. Good properties are achieved when the finger is designed as a three-sided pyramid with curved side surfaces. To ensure a sufficient scraping function and, if necessary, to achieve an optional cutting effect, it is advantageous if the front surface, ie the contact surface of the finger, is set at an angle ⁇ of 0° to 30° relative to a parallel to the axis of rotation of the impeller.
  • the posterior surface of the finger is less critical and may also be more inclined to the parallel where appropriate.
  • an angle ⁇ of the back surface of the finger to the parallel of the axis of rotation of the impeller between 0° and 50° is recommended.
  • the rear surface is double-curved, in particular double-curved in different directions. This also reduces the flow-influencing area of the finger.
  • the orientation and specific placement of the finger within the inlet is critical to the effectiveness of the wiping action.
  • the relative position of the finger to the spur of the volute casing and consequently to the discharge nozzle is relevant. It is advantageous if the finger is arranged in the vicinity of the spur, preferably after the spur in the direction of rotation. Such an arrangement has a further advantage, particularly in the case of horizontal pumps. Solid objects, such as stones, may collect in the lower part of the pump casing or impeller. By arranging the finger 30 in the vicinity of the spur, it is positioned outside of this danger point.
  • the exact position of the finger can be determined, for example, by the angle ⁇ .
  • the angle ⁇ corresponds to the angle of wrap, which is defined by the angle of intersection between the perpendicular and a tangent of the contact surface of the finger that intersects the axis of rotation of the impeller, with the tangent preferably running through the point on the contact surface that is furthest away from the axis of rotation in the radial direction.
  • Possible angular values of the angle ⁇ are 0° to 45°, preferably between 15° and 35° and ideally between 20° and 30°.
  • the selected finger length corresponds to at least 30% of the total radius r suck of the cylindrical inlet opening, preferably at least 50% and ideally between 70% and 80%.
  • the finger provides at least one section designed as a cutting edge, in particular on the side of the front contact surface of the finger, but the cutting edge extends perpendicularly to the stripping edge, ie parallel to the axis of rotation.
  • the cutting edge is preferably provided in the transition area of the finger to the fastening element of the finger.
  • FIG 1 shows an exploded view of the sewage pump 1 according to the invention.
  • the impeller 20, in detail figure 4 can be seen, comprises two backward-curved blades 21a, 21b, through which the pumped medium is sucked in through the cylindrical inlet opening 15 of the wear wall 12 and conveyed through the pumping chamber 16 of the volute casing 10 to the discharge port 13 and discharged through this.
  • the waste water to be pumped can contain a large number of different solids, for example fibrous materials, which can become lodged on certain parts of the pump during pump operation.
  • the stripper finger 30 according to the invention is provided, which is attached to the cylindrical inner wall of the inlet 15 and extends in the direction of the axis of rotation R.
  • the embodiment shown in the figures has a separate wear wall 12, the wear wall 12 could just as easily be dispensed with for the implementation of the invention and the finger 30 could be attached directly to the housing wall in the area of the suction mouth.
  • the design and mode of operation of the finger 30 will be discussed in more detail later, first the construction of the impeller 20 will be described.
  • Characteristic of the impeller 20 is the course of the in 4 shown leading edges 23 of the blades 21a, 21b. These begin directly at the impeller hub 22, in particular at the height of the upper, free end of the hub, and extend radially outwards, curved backwards.
  • the front faces of the blades 21a, 21b which are directed towards the suction cover and which extend through the inlet 15 are referred to as the leading edges 23.
  • leading edges 23 are also aligned at a defined angle ⁇ to the vertical projection surface of the axis of rotation R.
  • ⁇ is drawn in here the leading edge 23 of the impeller 20 with respect to the horizontal, which corresponds to a perpendicular projection to the axis of rotation R in the selected form of representation.
  • the selected inclination makes it possible to apply an additional axial force component to the conveyed medium in addition to the radial force, which optimizes the release of solids contained therein, which were grasped and scraped off by the finger 30 .
  • the angle ⁇ should be in the range between 5° and 75° or 10° to 45°. In the embodiment shown here, an angle of inclination ⁇ of about 25° is assumed (see Fig. Figure 7a, 7b ).
  • the scraper finger 30 is mounted on the inner wall of the inlet 15 of the wear plate and extends in the direction of the axis of rotation R.
  • the length of the scraper finger 30 should be at least 30%, preferably at least 50% or at best about 70% to 80% of the radius of the cylindrical Be inlet 15, which is hereinafter referred to as r suction .
  • the finger 30 is shaped like a pyramid with a total of three side surfaces 33, 35a, 35b and the base surface lying against the inner wall of the inlet 15.
  • the upper finger surface 33 facing the leading edges 23 of the impeller 20 is not planar but has a continuous curvature, both in the longitudinal direction of the finger (radial direction KR see Figure 5b ) as well as in the transverse direction (tangential direction KT see figure 8 ). In total, a kind of conical surface 33 results here.
  • the other side surfaces ie the side contact surface 35a and the rear side surface 35b, also have corresponding curvatures, with the rear side surface 35b even providing a double curvature in different directions. Compare this in particular Figure 5c .
  • the front contact surface 35a of the Fingers 30 inclined at an angle ⁇ of 0 ° to 30 ° to the axis of rotation R. In the 8 the angle ⁇ to a parallel P1 of the axis of rotation R is drawn.
  • the rear surface 35b of the finger 30 is less critical and can be inclined at an angle ⁇ relative to the axis of rotation R or the parallel P2 to the axis of rotation R of 0° from 50°.
  • the surface 35c can be rounded tangentially to the adjacent surfaces 35a, 35b. It is very difficult for solids to settle on the finger 30 when this angle definition is taken into account.
  • the leading edges 23 of the impeller 20 run towards the lateral contact surface 35a and then move past the opposite finger surface 33.
  • the transition edge between the lateral contact surface 35a and the upper surface 33 forms the so-called scraping edge, through which solids deposited on the inlet edges are scraped off and, due to the radial and axial speed of the pumped medium, are discharged into the spiral groove 11, via which they ultimately pass the impeller 20 be ejected through the pumping chamber 16 to the pressure port 13.
  • the distance between the leading edge 23 and the surface 33 or the scraping edge of the scraper finger 30 should be in a range between 0.05 and 3 mm, whereby this distance can vary in the radial direction, but should remain within the aforementioned value interval if possible. If the distance is too large, there is a risk that small solids cannot be caught by the scraper finger 30, whereas if the distance is too small, the risk of the scraper finger 30 and the leading edge 23 rubbing against each other increases.
  • the finger 30 or the upper surface 33 or at least the scraper edge should also have a corresponding inclination by the angle ⁇ . This can also be seen in Figure 7b .
  • the angles of inclination of the leading edge 23 and surface 33 do not necessarily have to be exactly identical but can also show minor differences. Despite these angle differences, however, the previously defined distance value should be within the desired value range.
  • the relative position of the scraper finger 30 to the spur 17 of the volute 10 also influences the delivery of the scraped solids to the pressure port 13.
  • the scraper finger 30 as in the sectional view of the 2 shown in the direction of rotation 2, ie in the representation of 2 clockwise, immediately behind the spur 17.
  • Solid objects, such as stones, may collect in the lower part of the pump casing or impeller.
  • the relative position of the stripper finger 30 to the spur 17 can be determined by the in 2 define the drawn angle ⁇ .
  • the angle ⁇ corresponds to the angle of wrap, which is defined by the angle of intersection between the perpendicular and the straight line G1.
  • the straight line G1 is perpendicular to the axis of rotation R and runs through the point on the lateral contact surface 35a of the stripper finger 30 that is furthest from the axis of rotation R in the radial direction.
  • Recommended values for the angle ⁇ are in the range between 0° and 45°, with an angle of 20° to 30° has turned out to be particularly advantageous.
  • the leading edge 23 of the vanes 21a, 21b moves past the top surface 33 during pump operation.
  • the tangent at the deepest point of the upper surface 33 (point of the smallest distance to the leading edge 23) forms the angle ⁇ with the tangent of the leading edge.
  • the angle ⁇ should be approximately 90°.
  • the angle ⁇ can also increase with an increasing radius r starting from the impeller hub 22. This means that as the radius r increases, the angle ⁇ also increases.
  • the normalized radius (r - r suction ) where r suction represents the radius of the inlet 15, which is shown in FIG figure 9 shown course can be accepted.
  • the angle ⁇ can be between 50° and 120° near the center of the impeller 20 and between 85° and 160° at the outer edge.
  • the course of the angle can be freely selected within this range, but optimally a continuously increasing angle ⁇ should be selected.
  • the lateral contact surface 35a of the finger 30 should also assume an angle ⁇ of between 180° and 120° in relation to the tangential course of the groove 11 .
  • This angle ⁇ is in figure 3 and has a value of about 165° there.
  • the finger 30 can be designed with a cutting edge 32 that extends perpendicularly to the surface 33 of the finger in the area of the transition to the fastening element 31 .
  • the cutting edge runs almost parallel to the axis of rotation R.
  • the stripper finger 30 can be detachably connected to the wear wall 12 or the housing 10 by means of the fastening element 31, whereby care must be taken here that the fastening element 31 does not protrude into the inlet 15 in order to to avoid any influence on the flow properties within the pump.
  • the 9 shows the angle ⁇ between the running leading edge 23 of the running wheel 20 and the finger 30.

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

Claims (10)

  1. Pompe à eaux usées (1) permettant de refouler des eaux usées chargées en matières solides, comprenant une corps en spirale (10) pourvu d'une ouverture d'entrée (15), une roue à aubes (20) pourvue d'au moins une aube (21a, 21b), dans laquelle le bord d'attaque (23) associé à l'aube (21a, 21b) respective s'étend du moyeu de roue à aubes (22) vers l'extérieur avec une courbure arrière, et au moins un doigt (30) pour racler des salissures du bord d'attaque (23), dans laquelle le doigt (30) est disposé sur la paroi intérieure d'entrée et s'étend en direction de l'axe de rotation R de la roue à aubes (20), et dans laquelle au moins une rainure (11) pratiquée dans une paroi intérieure côté aspiration du corps (10, 12) est prévue, et le bord d'attaque (23) de la roue à aubes (20) et la surface de doigt supérieure (33) tournée vers le bord d'attaque (23) présentent un angle α de 5° à 75° par rapport à la surface de projection verticale de l'axe de rotation R,
    caractérisée en ce que le bord d'attaque (23) de la roue à aubes (20) forme par rapport à une surface effective latérale (35a) du doigt (30) an angle β dont la valeur dans la direction radiale est située pour r/rsaug = 0,2 entre 50° à 120°, et pour r/rsaug = 1 entre 85° à 160°, et varie de préférence de manière substantiellement régulière entre ces points radiaux, le rayon rsaug correspondant au rayon de l'ouverture d'entrée cylindrique du corps.
  2. Pompe à eaux usées (1) selon la revendication 1, caractérisée en ce que la surface de doigt supérieure (33) du doigt (30) présente par rapport au bord d'attaque (23) de l'aube (20) au moins par endroits une distance de 0,05 à 3 mm.
  3. Pompe à eaux usées (1) selon l'une quelconque des revendications précédentes, caractérisée en ce que l'angle tangentiel δ entre la surface de la rainure (11), atteinte par l'écoulement dans la direction de rotation, et la surface effective latérale (35a) du doigt est situé dans la plage entre 120° et 180°, de préférence entre 140° et 180°, et de manière particulièrement préférée entre 160° et 180°.
  4. Pompe à eaux usées (1) selon l'une quelconque des revendications précédentes, caractérisée en ce que le doigt (30) présente la forme d'une pyramide à trois faces ayant des surfaces latérales courbes (33, 35a, 35b), la surface avant (35a) présentant un angle γ de 0° à 30° par rapport à l'axe de rotation R ou à une ligne parallèle P1 à l'axe de rotation R, et la surface arrière (35b) présentant un angle ε de 0° à 50° par rapport à l'axe de rotation R ou à une ligne parallèle P2 à l'axe de rotation R.
  5. Pompe à eaux usées (1) selon l'une quelconque des revendications précédentes, caractérisée en ce que la surface arrière (35b) du doigt (30) est courbée doublement dans la direction radiale dans au moins deux sens différents.
  6. Pompe à eaux usées (1) selon l'une quelconque des revendications précédentes, caractérisée en ce que le doigt (30) est disposé à proximité d'un ergot (17) du corps en spirale (10), se trouvant de préférence dans la direction de rotation (2) directement ou peu après l'ergot (17).
  7. Pompe à eaux usées (1) selon la revendication 6, caractérisée en ce que le doigt (30) est positionné selon un angle d'enroulement ϕ dans la plage de valeurs de 0° à 45°, de manière particulièrement préférée de 15° à 35° et idéalement de 20° et 30°, dans laquelle l'angle d'enroulement ϕ est défini par l'angle de coupe de la verticale avec une tangente (G1), intersectant l'axe de rotation R, de la surface effective (35a) du doigt (30), dans laquelle la tangente (G1) s'étend de préférence à travers le point de la surface effective (35a) le plus éloigné dans la direction radiale jusqu'à l'axe de rotation R.
  8. Pompe à eaux usées (1) selon l'une quelconque des revendications précédentes, caractérisée en ce que la longueur de doigt correspond à au moins 30 % du rayon r de l'ouverture d'entrée, de préférence à au moins 50 % et idéalement à 70% à 80%.
  9. Pompe à eaux usées (1) selon l'une quelconque des revendications précédentes, caractérisée en ce que le doigt (30) est relié de manière amovible au corps (10) ou à un insert de corps côté aspiration (12), en particulier au moyen d'un élément de fixation (31) réalisé côté extrémité sur le doigt et qui peut être vissé avec le corps (10) ou l'insert de corps (12), dans laquelle l'élément de fixation (31) et sa disposition sur le corps (10) ou sur l'insert de corps (12) sont réalisés de façon à ce que celui-ci ne fasse pas saillie dans l'ouverture d'entrée (15) du corps (10).
  10. Pompe à eaux usées (1) selon l'une quelconque des revendications précédentes, caractérisée en ce que le doigt (30) prévoit en option au moins une petite partie réalisée sous forme d'arête de coupe (32), en particulier dans la zone de transition du doigt (30) à l'élément de fixation (31) du doigt (30), l'arête de coupe (32) s'étendant en particulier de préférence en parallèle à l'axe de rotation R.
EP19191970.3A 2019-08-15 2019-08-15 Élément de raclage pour bords d'attaque de roue à aubes pour des pompes à eau Active EP3779201B1 (fr)

Priority Applications (9)

Application Number Priority Date Filing Date Title
EP19191970.3A EP3779201B1 (fr) 2019-08-15 2019-08-15 Élément de raclage pour bords d'attaque de roue à aubes pour des pompes à eau
HUE19191970A HUE062508T2 (hu) 2019-08-15 2019-08-15 Lehúzóelem szennyvízszivattyúk járókerekeinek belépõéleihez
US17/635,236 US12044252B2 (en) 2019-08-15 2020-08-03 Wiping element for impeller leading edges of wastewater pumps
AU2020327570A AU2020327570A1 (en) 2019-08-15 2020-08-03 Wiping element for impeller leading edges of wastewater pumps
BR112022002294A BR112022002294A2 (pt) 2019-08-15 2020-08-03 Bomba de águas residuais para transportar águas residuais carregadas de sólidos
CN202080057382.5A CN114245849B (zh) 2019-08-15 2020-08-03 用于污水泵的叶轮进口边缘的刮除元件
PCT/EP2020/071792 WO2021028246A1 (fr) 2019-08-15 2020-08-03 Élément d'essuyage pour bords d'attaque de turbine de pompes pour eaux usées
CA3149426A CA3149426A1 (fr) 2019-08-15 2020-08-03 Element d'essuyage pour bords d'attaque de turbine de pompes pour eaux usees
SA522431683A SA522431683B1 (ar) 2019-08-15 2022-02-15 عنصر مسح للحواف الأمامية للدفاعة بمضخات ماء الصرف

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19191970.3A EP3779201B1 (fr) 2019-08-15 2019-08-15 Élément de raclage pour bords d'attaque de roue à aubes pour des pompes à eau

Publications (3)

Publication Number Publication Date
EP3779201A1 EP3779201A1 (fr) 2021-02-17
EP3779201C0 EP3779201C0 (fr) 2023-06-07
EP3779201B1 true EP3779201B1 (fr) 2023-06-07

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EP19191970.3A Active EP3779201B1 (fr) 2019-08-15 2019-08-15 Élément de raclage pour bords d'attaque de roue à aubes pour des pompes à eau

Country Status (9)

Country Link
US (1) US12044252B2 (fr)
EP (1) EP3779201B1 (fr)
CN (1) CN114245849B (fr)
AU (1) AU2020327570A1 (fr)
BR (1) BR112022002294A2 (fr)
CA (1) CA3149426A1 (fr)
HU (1) HUE062508T2 (fr)
SA (1) SA522431683B1 (fr)
WO (1) WO2021028246A1 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3988793B1 (fr) * 2020-10-26 2024-08-07 Xylem Europe GmbH Pompe ayant un siège de roue doté d'une broche de guidage
EP4102080A1 (fr) * 2021-06-08 2022-12-14 Xylem Europe GmbH Pompe et unité hydraulique d'une pompe
WO2023057236A1 (fr) 2021-10-04 2023-04-13 KSB SE & Co. KGaA Pompe centrifuge dotée d'une paroi d'usure résistante à l'usure pourvue d'un élément de raclage
DE102022124356A1 (de) 2021-10-04 2023-05-25 KSB SE & Co. KGaA Kreiselpumpe mit verschleißbeständiger Schleißwand mit Abstreifelementrschleißbeständiger Schleißwand mit Abstreifelement

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Also Published As

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CN114245849A (zh) 2022-03-25
EP3779201C0 (fr) 2023-06-07
CA3149426A1 (fr) 2021-02-18
US20220290695A1 (en) 2022-09-15
US12044252B2 (en) 2024-07-23
WO2021028246A1 (fr) 2021-02-18
SA522431683B1 (ar) 2024-06-06
EP3779201A1 (fr) 2021-02-17
AU2020327570A1 (en) 2022-02-17
CN114245849B (zh) 2024-08-13
BR112022002294A2 (pt) 2022-04-26
HUE062508T2 (hu) 2023-11-28

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