EP3872350B1 - Aube de rotor - Google Patents

Aube de rotor Download PDF

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Publication number
EP3872350B1
EP3872350B1 EP20159221.9A EP20159221A EP3872350B1 EP 3872350 B1 EP3872350 B1 EP 3872350B1 EP 20159221 A EP20159221 A EP 20159221A EP 3872350 B1 EP3872350 B1 EP 3872350B1
Authority
EP
European Patent Office
Prior art keywords
blade
backbone
impeller
lamella
side plate
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
EP20159221.9A
Other languages
German (de)
English (en)
Other versions
EP3872350A1 (fr
Inventor
Prof. Dr. Thomas Speck
Dr. Georg Bold
Dr. Marc Thielen
Dr. Linnea Hesse
Christian Seidler
Uwe Schaumann
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.)
EGO Elektro Geratebau GmbH
Original Assignee
EGO Elektro Geratebau GmbH
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
Application filed by EGO Elektro Geratebau GmbH filed Critical EGO Elektro Geratebau GmbH
Priority to PL20159221.9T priority Critical patent/PL3872350T3/pl
Priority to EP20159221.9A priority patent/EP3872350B1/fr
Publication of EP3872350A1 publication Critical patent/EP3872350A1/fr
Application granted granted Critical
Publication of EP3872350B1 publication Critical patent/EP3872350B1/fr
Active legal-status Critical Current
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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
    • F04D29/24—Vanes
    • F04D29/247—Vanes elastic or self-adjusting
    • 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
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/30—Vanes
    • F04D29/305—Flexible vanes
    • 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
    • F05D2300/00—Materials; Properties thereof
    • F05D2300/50—Intrinsic material properties or characteristics
    • F05D2300/502—Thermal properties
    • F05D2300/5024—Heat conductivity

Definitions

  • the invention relates to a blade for an impeller, in particular for a radial flow impeller.
  • the invention further relates to impellers, in particular radial flow impellers, comprising several blades, and to turbomachines having an impeller, in particular axial or centrifugal fans or axial or centrifugal pumps.
  • the invention relates to a household appliance comprising a turbomachine having an impeller.
  • Fans and pumps in particular centrifugal fans and pumps are widely used in household appliances for conveying air and/or water.
  • An impeller for a fan or pump comprises several blades.
  • the impeller blades can have different profiles.
  • several different fan types are known including flat blades, negative blades and positive blades.
  • the different fan types have different advantages, for example a high degree of efficiency or a self-cleaning effect.
  • the choice of a specific fan type is made by the person skilled in the art in consideration of several factors including a field of application, a conveying direction and a conveyed medium.
  • the number and size of the blades are typically suitably selected for the desired application.
  • For conveying different media and/or in different conveying directions in one household appliance generally two different fans or pumps are provided.
  • US 2014/193260 A1 discloses an impeller having a plurality of blades which are designed, at least in regions, to be elastic and have a fixed mounting arranged in a region located near the impeller axis of rotation.
  • the blades can bend elastically radially outward from this fixed mounting counter to a spring force, so that the blades are deformable or moveable between a first position adapted to convey air, and a second position adapted to convey a medium having a higher density such as a liquid in particular water.
  • DE 10 2005 038 217 A1 shows an impeller for a pump having elastically deformable lamellae, which are mounted to a cap by a stiff backbone extending in a longitudinal direction of the impeller, so that the lamellae can assume two different shapes depending on a direction of rotation-
  • a blade for an impeller in particular for a radial flow impeller, wherein the blade comprises a lamella, which lamella is at least partly reversibly elastically deformable, wherein the blade further comprises a backbone extending in a longitudinal direction, which backbone is mounted to or formed integrally with a side of the lamella, wherein the backbone has a first end and a second end, which first end and second end are reversibly displaceable in the longitudinal direction towards each other under a lateral deflection of the backbone, wherein the lamella is configured such that the lateral deflection of the backbone causes a lateral deformation of the lamella and a flap motion of the lamella about an axis parallel to the longitudinal direction.
  • the profile of the blade is adjustable such that the blade upon its deformation at least assumes the form of a flat blade and one of a negative blade and a positive blade.
  • the profile of the blade is continuously variable by compressing the backbone up to a flap motion of 90°.
  • a lamella is defined as a thin plate-like structure.
  • the lamella in its flat state has a rectangular shape with two long sides and two short sides.
  • the backbone in one embodiment is arranged at a long side of the lamella.
  • the lamella has other shapes.
  • the backbone in embodiments of the invention is chosen to have a higher stiffness than the lamella.
  • the backbone is in the form of a rod.
  • the backbone is predeflected, such that the backbone has a lateral deflection when the lamella is in an initial state, in particular a flat initial state.
  • the shape of the lamella is adapted to the predeflection of the backbone, wherein in one embodiment a side of the lamella to which the backbone is mounted or with which the backbone is formed integrally, is curved to match the predeflection of the backbone.
  • the lamella in the initial state the lamella is flat, wherein the lamella projects from the backbone in the direction of an apex of the deflection.
  • a proximal area of the lamella adjacent to the backbone has a lower stiffness than a distal area of the lamella.
  • a preferred direction for the lateral deformation and flap motion of the lamella can be set.
  • the stiffness is decreased in the proximal area by slots extending crosswise to the backbone.
  • the lamella and the backbone are made from the same material, wherein for example a thickness of the lamella differs from that of the backbone to achieve differing stiffness properties. In other embodiments, the lamella and the backbone are made from different materials.
  • the lamella and/or the backbone are made of metal material, in particular made of a metal sheet or a metal tube.
  • the metal material is a super-elastic material as distributed for example under the tradename Nitinol by the company Euroflex GmbH.
  • the complete blade is manufactured in metal using punching technique. In this case, a different stiffness of the backbone and the lamella can be achieved by appropriate deformation, which results in different material properties.
  • the backbone is strain-hardened during the punching process. For a predeflection, the backbone in one embodiment is simultaneously brought into a curved shape.
  • beads are provided.
  • a stiffness of the lamella is modified in the punching process.
  • slots are provided for a modification of the stiffness.
  • the lamella is provided in its proximal area adjacent to the backbone with a number of slots, in particular with a number of parallel slots extending crosswise to the longitudinal direction of the backbone.
  • the blades are manufactured from a tube which is cold drawn.
  • the lamella is provided with a heading conductor.
  • the heating conductor allows the conveyed medium, in particular air, to be heated directly when passing the blades.
  • the heating effect in one embodiment is used to trigger a deformation of the blades, for example in case of a heating effect, flat blades are advantageous to avoid that dust, lint, fibers and/or flocks will stick to the blades when heating the blades.
  • flexible heating conductors for example embroidered wires, are provided, which within limits can compensate for the deformation of the blades.
  • the heating conductor is in one embodiment provided at the distal area of the lamella, i.e. in an area of low deformation.
  • the lamella and/or the backbone are made of plastic material, in particular made using two or more different plastic materials.
  • the complete blade is manufactured in plastic, in particular using 3D printing, for example multi-material printing. For multi-material printing, two or more different plastic materials having different material properties are printed simultaneously. Depending on the ratio of the at least two materials, it is possible to change from a stiff or rigid to a flexible structure in the component.
  • an impeller comprising at least one blade having an adaptable profile.
  • the impeller in embodiments of the invention is a radial flow impeller.
  • the invention is not limited to radial flow impellers.
  • the impeller in advantageous embodiments has a number of blades with an adaptable profile, wherein the number of blades can be chosen by the skilled person according to the operation conditions.
  • the impeller is in particular advantageous for applications in which a flow direction is reversed.
  • the impeller in one embodiment comprises a first side plate and a second side plate, which are distanced from each other in the longitudinal direction of the at least one blade, wherein the first end of the backbone is mounted to the first side plate and the second end of the backbone is mounted to the second side plate.
  • the blades are moveable for a compression with respect to the blades.
  • At least one of the first side plate and the second side plate is mounted displaceable in the longitudinal direction of the blade.
  • the first end and the second end of the backbones are mounted to the first side plate and the second side plate for a deformation of the blades upon a relative movement of side plates.
  • the impeller is configured for a displacement of at least one of the first side plate and the second side plate in response to a temperature change.
  • flat blades are advantageous to avoid dust, lint, fluffs, fibers and/or flocks from caking or sticking to the blades. This is in particular important when conveying hot air, which might ignite inflammable material sticking to the blades. Therefore, in one embodiment, a temperature sensor, a temperature sensitive shape memory material or any other temperature- sensitive means is provided, which will cause an adaption of a blade profile to a prevailing temperature.
  • At least one spring element made of shape memory material is provided for causing a displacement of at least one of the first side plate and the second side plate in the longitudinal direction of the blade towards and/or away from each other.
  • the profile of the blade is continuously variable by compressing the backbone up to a flap motion of 90° of the lamella.
  • a distance between the first side plate and the second side plate is continuously adjustable, wherein in particular at least one predefined intermediate stop position is provided between a maximum distance and a minimum distance of the first side plate and the second side plate. This allows the impeller to assume defined shapes.
  • the impeller is a split impeller, having inner blades and outer blades, wherein at least the outer blades are deformable for adjusting a blade geometry of the impeller.
  • the blades having a fixed profile are provided with heating elements, wherein a profile of the blades of other rim is adjustable to adapt the impeller to different working conditions, thereby improving its efficiency.
  • the blades having a fixed profile are mounted in the first side plate and/or the second side plate such that said side plate is displaceable with respect to the blades.
  • the side plate is a split side plate, wherein only a region of the side plate to which the deformable blades are mounted is displaced.
  • a turbomachine in particular a centrifugal fan or a centrifugal pump, with an impeller is provided.
  • the use of such a turbomachine is advantageous in various different fields having varying boundary conditions and/or when conveying different media and/or media having varying properties and/or two-phase mixtures or aerosols.
  • the turbomachine is adapted to allow a rotation of the impeller in opposite directions.
  • a household appliance comprising a turbomachine
  • the household appliance in one embodiment is a condense dryer.
  • the invention is not limited to condense dryers, and an impeller with deformable blades may also be used in a washing machine or a dishwasher.
  • the impeller is mounted to a housing of the appliance and driven conjointly with the drum of the condense dryer or washing machine, wherein a rotational speed in one embodiment is adapted using a belt or gearbox.
  • the impeller is mounted to the drum and rotated with the drum.
  • Fig. 1 schematically shows a centrifugal fan 100 with five different types of blades 11, 12, 13, 14, 15, 16.
  • centrifugal fans are provided with a plurality of blades 11, 12, 13, 14, 15, 16 of the same type.
  • the type of blade 11, 12, 13, 14, 15, 16 is chosen by the skilled person in consideration of the intended use of the fan 100.
  • a first type of blades is a backward-curved blade 11, which is advantageous due to a high efficiency.
  • radial blades 15 are advantageous for applications with reverse flow.
  • Backward-inclined blades 16 are advantageous to avoid caking.
  • a blade with a lamella which is at least partly reversibly elastically deformable is provided, which allows for an adjustment of the blade type to different operating conditions.
  • Figs. 2 and 3 schematically show a blade 2 with a lamella 20 in a top view and a side view, respectively.
  • the lamella 20 shown in Figs. 2 and 3 has a rectangular basic shape with four sides 200, 201, 202, 203. However, this shape is only by way of example.
  • the blade 2 further comprises a backbone 21 extending in a longitudinal direction L, which backbone 21 is mounted to or formed integrally with one side 200 of the lamella 20.
  • the backbone 21 has a first end 211 and a second end 212, wherein a displacement of the first end 211 and the second end 212 towards each other causes a lateral-torsional buckling of the blade 2.
  • Fig. 4 shows schematically in a side view a lateral-torsional buckling of the blade 2 of Fig. 2 subjected to compression forces F applied to the first end 211 and the second end 212.
  • the first end 211 and the second end 212 are reversibly displaceable in the longitudinal direction L towards each other under a lateral deflection of the backbone 21.
  • the lamella 20, which is attached to or formed integrally with the backbone 21, is configured such that the lateral deflection of the backbone 21 causes a lateral deformation of the lamella 20 and a flap motion of the lamella 20 about an axis parallel to the longitudinal direction L.
  • the shape of the blade 2 can be modified for example for adapting the blade 2 to different operating conditions.
  • Figs. 5 and 6 schematically show in a side view and a top view an impeller 3 comprising several blades 20 in a first state, wherein lamellae 20 of the blades 2 extend in a radial direction.
  • Figs. 7 and 8 schematically show in a side view and a top view the impeller 3 of Figs. 5 and 6 in a second state, wherein the blades are backward curved.
  • the impeller 3 comprises a first side plate 31 and a second side plate 32, which are distanced from each other in the longitudinal direction L of the blades 2 wherein the first end 211 (see Figs. 2 to 4 ) of the backbone 21 is mounted to the first side plate 31 and the second end 32 (see Figs. 2 to 4 ) of the backbone 21 is mounted to the second side plate 32.
  • the first side plate 31 and the second side plate 32 are moved towards each other, thereby causing a deformation of the backbones 21 of the blades 2, which causes a lateral deformation of the lamellae 20 and a flap motion of the lamellae 20 about associated axes parallel to the longitudinal direction L.
  • a compression force can be applied for example by means of an actuator (not shown).
  • a return movement is also induced by an actuator applying a force in the opposite direction.
  • a return movement is realized by means of restoration forces of spring elements (not shown) provided between the first side plate 31 and a second side plate 32.
  • 5 to 8 are only by way of example and other forms are conceivable and can be chosen by the skilled person in accordance with an intended use of the impeller, for example in accordance with a medium conveyed by the impeller, a direction of rotation and/or other boundary conditions, for example a temperature of the medium conveyed.
  • only one of the first side plate 31 and the second side plate 32 is mounted moveably in the longitudinal direction L of the blades 2, whereas the other side plate is mounted stationary. In other embodiments, both side plates 31, 32 are mounted moveably in the longitudinal direction L of the blades 2.
  • a distance between the first side plate 31 and the second side plate 32 is continuously adjustable, for example using actuator or a spring element assembly comprising at least one spring element made of shape memory material.
  • at least one predefined intermediate stop position is defined between a maximum distance and a minimum distance of the first side plate 31 and the second side plate 32, wherein for example a mechanical and/or electronical endstop (not shown) is provided for limiting a movement of at least one of the first side plate 31 and the second side plate 32 in order to reliably obtain the at least predefined intermediate stop position.
  • a movement beyond the endstop, in particular beyond a mechanical endstop, in one embodiment is possible by applying a higher force.
  • the endstop, in particular an electromechanical endstop can be deactivated for a movement beyond the endstop.
  • Fig. 9 to 11 show further embodiments of a blade 2 having a backbone 21 and a lamella 20 similar to the blade 2 shown in Fig. 3 , wherein for the same or similar elements the same reference numbers are used.
  • the backbone 21 is predeflected, such that the backbone 21 has a lateral deflection when the lamella 20 is in an initial state shown in Fig. 9 .
  • the predeflection is advantageous for ensuring a desired deformation of the blade 2.
  • the blade 2 as shown in Figs. 2 to 4 and 9 on embodiments of the invention are manufactured of plastic material, for example using 3D printing techniques.
  • the blades are manufacture using multi-material printing techniques, wherein two or more different plastic materials, having different material properties, are printed simultaneously. Depending on a ratio of the at least two plastic materials, it is possible to form a blade 2 having a comparatively rigid backbone 21 and a comparatively flexible lamella 20.
  • Fig. 10 shows a blade 2 with a backbone 21 and a lamella 20, which blade 2 is manufactured in metal for example using a punching technique.
  • different stiffness of the backbone 21 and the lamella 20 are achieved by a suitable deformation of the metal material, for example providing beads.
  • the backbone 21 is strain-hardened during or after a punching step.
  • the backbone 21 can also be brought into a curved shape.
  • a number of parallel slots 207 are provided in a proximal area 205 of the lamella 20 adjacent to the backbone 21, which slots 207 extend crosswise to the longitudinal direction L. Due to the slots 207, the proximal area 205 has a lower stiffness than a distal area 206 of the lamella 20 and a preferential direction for the deformation of the lamella 20 is achieved.
  • Fig. 11 shows a blade 2 with a backbone 21 and a lamella 20 similar to Fig. 10 , which blade 2 is manufactured in metal for example using a punching technique.
  • the lamella 20 is provided with a heading conductor 24.
  • the heating conductor allows the conveyed medium, in particular air, to be heated directly when passing the blade 2.
  • the heating conductor 24 is provided at the distal area 206 of the lamella 20, i.e. in an area of low deformation.
  • Fig. 12 shows in a top view a second embodiment of an impeller 103, wherein the impeller 103 shown in Fig. 12 is a split impeller 103, having inner blades 102 and outer blades 2.
  • the outer blades 2 are deformable for adjusting a blade geometry of the impeller 103, whereas the inner blades 102 have a fixed profile.
  • Fig. 13 schematically shows a household appliance 4, for example a dishwasher or a dryer, with cleaning compartment 40 to which a medium, for example air, is conveyed using a turbomachine 5, for example a centrifugal fan, comprising an impeller 3 as shown in Figs 5 to 8 or 12 .
  • a turbomachine 5 for example a centrifugal fan, comprising an impeller 3 as shown in Figs 5 to 8 or 12 .
  • Supply air is conveyed to the cleaning compartment 40 via an air intake duct 41 and outgoing air is discharged to the outside via an exhaust air duct 42.
  • a circulation of the air is achieved by means of the turbomachine 5
  • a device 43 such as a filter, condensation unit or a heat pump is provided, wherein the circulated air either passes through the device 43 or is conveyed through a bypass 44.
  • a blade profile of the blades of the turbomachine is adjusted depending on whether or not the circulated air passes through the device 43.

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

Claims (15)

  1. Aube de rotor, en particulier pour un rotor à flux radial, l'aube (2) comprenant une lamelle (20), qui est au moins partiellement élastiquement déformable de manière réversible, l'aube (2) comprenant en outre une embase (21) s'étendant dans une direction longitudinale (L), laquelle embase (21) est montée sur ou formée d'un seul tenant avec un côté (200, 201, 202, 203) de la lamelle (20), l'embase (21) ayant une première extrémité (211) et une seconde extrémité (212), l'aube étant caractérisée en ce que la première extrémité (211) et la seconde extrémité (212) sont déplaçables de manière réversible dans la direction longitudinale (L) l'une vers l'autre sous l'effet d'un fléchissement latéral de l'embase (21), la lamelle (20) étant configurée de telle façon que le fléchissement latéral de l'embase (21) provoque une déformation latérale de la lamelle (20) et un mouvement de battement de la lamelle (20) autour d'un axe parallèle à la direction longitudinale (L), et le déplacement de la première extrémité (211) et de la seconde extrémité (212) de l'embase (21) l'une vers l'autre dans la direction longitudinale (L) provoque un flambage par torsion latérale de l'aube (2), ce qui entraîne une modification du profil de l'aube (2).
  2. Aube selon la revendication 1, caractérisée en ce que l'embase (21) est préfléchie, de telle sorte que l'embase (21) présente un fléchissement latéral quand la lamelle (20) est dans un état initial.
  3. Aube selon la revendication 1 ou 2, caractérisée en ce que la zone proximale (205) de la lamelle (20) adjacente à l'embase (21) présente une rigidité moindre qu'une zone distale (206) de la lamelle.
  4. Aube selon l'une quelconque des revendications 1, 2 ou 3, caractérisée en ce que la lamelle (20) et/ou l'embase (21) sont fabriquées dans une matière métallique, en particulier à partir d'une feuille métallique ou d'un tube métallique.
  5. Aube selon l'une quelconque des revendications 1 à 4, caractérisée en ce que la lamelle (20) est pourvue d'un conducteur chauffant (24), dans laquelle en particulier le conducteur chauffant (24) est disposé dans la zone distale (206) de la lamelle (20).
  6. Aube selon l'une quelconque des revendications 1 à 5, caractérisée en ce que la lamelle (20) et/ou l'embase (21) sont fabriquées dans une matière plastique, en particulier dans deux matières plastiques différentes ou plus.
  7. Rotor, en particulier un rotor à flux radial, comprenant au moins une aube (2) selon l'une quelconque des revendications 1 à 6.
  8. Rotor selon la revendication 7, comprenant une première plaque latérale (31) et une seconde plaque latérale (32), qui sont écartées l'une de l'autre dans la direction longitudinale (L) de l'au moins une aube (2), dans lequel la première extrémité (211) de l'embase (21) est montée sur la première plaque latérale (31) et la seconde extrémité (32) de l'embase (21) est montée sur la seconde plaque latérale (32).
  9. Rotor selon la revendication 8, caractérisé en ce qu'au moins une de la première plaque latérale (31) et de la seconde plaque latérale (32) est montée de façon déplaçable dans la direction longitudinale (L) de l'aube (2).
  10. Rotor selon la revendication 9, caractérisé en ce que le rotor (3) est configuré pour permettre un déplacement d'au moins une de la première plaque latérale (31) et de la seconde plaque latérale (32) en réponse à un changement de température.
  11. Rotor selon l'une quelconque des revendications 9 ou 10, caractérisé en ce qu'au moins un élément ressort fabriqué dans une matière à mémoire de forme est fourni pour provoquer un déplacement d'au moins une de la première plaque latérale (31) et de la seconde plaque latérale (32) dans la direction longitudinale (L) de l'aube (2) pour les rapprocher et/ou les éloigner l'une de l'autre.
  12. Rotor selon l'une quelconque des revendications 9 à 11, caractérisé en ce qu'une distance entre la première plaque latérale (31) et la seconde plaque latérale (32) est ajustable en continu, dans lequel en particulier au moins une position d'arrêt intermédiaire prédéfinie est prévue entre une distance maximale et une distance minimale de la première plaque latérale (31) et de la seconde plaque latérale (32).
  13. Rotor selon l'une quelconque des revendications 7 à 12, dans lequel le rotor est un rotor dédoublé (103), ayant des aubes internes (102) et des aubes externes (2), et dans lequel au moins les aubes externes (2) sont déformables pour ajuster un profil d'aubes.
  14. Turbomachine, en particulier un ventilateur centrifuge ou une pompe centrifuge, comportant un rotor (3, 103) selon l'une quelconque des revendications 7 à 13.
  15. Appareil électroménager comprenant une turbomachine selon la revendication 14.
EP20159221.9A 2020-02-25 2020-02-25 Aube de rotor Active EP3872350B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PL20159221.9T PL3872350T3 (pl) 2020-02-25 2020-02-25 Łopatka do wirnika
EP20159221.9A EP3872350B1 (fr) 2020-02-25 2020-02-25 Aube de rotor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20159221.9A EP3872350B1 (fr) 2020-02-25 2020-02-25 Aube de rotor

Publications (2)

Publication Number Publication Date
EP3872350A1 EP3872350A1 (fr) 2021-09-01
EP3872350B1 true EP3872350B1 (fr) 2023-11-29

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EP20159221.9A Active EP3872350B1 (fr) 2020-02-25 2020-02-25 Aube de rotor

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EP (1) EP3872350B1 (fr)
PL (1) PL3872350T3 (fr)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1035313B (de) * 1954-10-07 1958-07-31 Licentia Gmbh Luefterfluegel aus weichem elastischem Werkstoff
US5993158A (en) * 1997-10-17 1999-11-30 Dbs Manufacturing, Inc. Method and apparatus for aeration using flexible blade impeller
DE102005038217A1 (de) * 2005-08-10 2007-02-15 Schlötzer, Oliver Pumpenrad Drehrichtungsunabhängig
DE102011078017B3 (de) 2011-06-22 2012-06-21 E.G.O. Elektro-Gerätebau GmbH Pumpe

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EP3872350A1 (fr) 2021-09-01
PL3872350T3 (pl) 2024-04-22

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