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EP4166791B1 - Rotor radial - Google Patents

Rotor radial

Info

Publication number
EP4166791B1
EP4166791B1 EP21202991.2A EP21202991A EP4166791B1 EP 4166791 B1 EP4166791 B1 EP 4166791B1 EP 21202991 A EP21202991 A EP 21202991A EP 4166791 B1 EP4166791 B1 EP 4166791B1
Authority
EP
European Patent Office
Prior art keywords
vane
vanes
halves
plug
support 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
EP21202991.2A
Other languages
German (de)
English (en)
Other versions
EP4166791A1 (fr
EP4166791C0 (fr
Inventor
Thomas Heigold
Klaus Gundel
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.)
Nicotra Gebhardt GmbH
Original Assignee
Nicotra Gebhardt 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 Nicotra Gebhardt GmbH filed Critical Nicotra Gebhardt GmbH
Priority to EP21202991.2A priority Critical patent/EP4166791B1/fr
Priority to AU2022252728A priority patent/AU2022252728A1/en
Priority to CA3179045A priority patent/CA3179045A1/fr
Priority to CN202211256923.4A priority patent/CN115977997A/zh
Priority to US17/966,255 priority patent/US12241475B2/en
Publication of EP4166791A1 publication Critical patent/EP4166791A1/fr
Application granted granted Critical
Publication of EP4166791B1 publication Critical patent/EP4166791B1/fr
Publication of EP4166791C0 publication Critical patent/EP4166791C0/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • F04D29/26—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
    • F04D29/281—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers
    • 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
    • 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
    • F04D29/02—Selection of particular materials
    • F04D29/023—Selection of particular materials especially adapted for elastic fluid 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
    • 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
    • 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
    • F05D2230/00—Manufacture
    • F05D2230/20—Manufacture essentially without removing material
    • F05D2230/23—Manufacture essentially without removing material by permanently joining parts together
    • F05D2230/232—Manufacture essentially without removing material by permanently joining parts together by welding
    • 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
    • F05D2250/00—Geometry
    • F05D2250/20—Three-dimensional
    • F05D2250/29—Three-dimensional machined; miscellaneous
    • F05D2250/291—Three-dimensional machined; miscellaneous hollowed

Definitions

  • the invention relates to a radial impeller, with a cover plate having an inlet opening and a support plate, which are connected to one another via a blade ring having a plurality of blades, wherein the blades each have two opposite side edges, one of which is connected to the cover plate and the other to the support plate, wherein the side edges each extend between a blade leading edge and a blade trailing edge opposite in an impeller circumferential direction.
  • EP 2 835 539 A1 a method for manufacturing a radial fan with hollow blades from two welded halves.
  • the convexly curved end sections are each formed as formed sections produced by plastically forming a blade half blank without cutting. Embossing the blade half blanks is particularly suitable for plastically forming. In this case, the convexly curved end sections are embossed.
  • the blades are designed as components separate from the cover disk and the support disk and are connected by fastening measures in the region of their side edges on the one hand to the cover disk and on the other hand to the support disk.
  • the form-fitting connection is designed as a plug-in connection, with plug-in elements and counter-plug-in elements arranged on the one hand on the side edges of the respective blades and on the other hand on the cover or support disk, and assigned to one another.
  • the plug-in elements are designed as elongated plug-in pins, preferably plug-in tabs, and the counter-plug-in elements are designed as receiving openings, in particular receiving slots, that accommodate the plug-in tabs.
  • the plug-in pins are expediently located on the blades, and the receiving openings are located on the cover and support disks.
  • the elongated plug-in pins are adapted to the contour of the outer surfaces of the blade halves and are also convexly curved, wherein the contour of the receiving slots is adapted to the contour of the elongated plug-in pins.
  • the blades each have two outer surfaces facing away from each other, of which the front outer surface in the direction of travel, in particular a convexly curved one, represents the pressure side, and the opposite outer surface, which may be concavely curved, represents the suction side.
  • the elongated plug-in pins it is possible for the elongated plug-in pins to be arranged on the side edges of the blades in such a way that the elongated plug-in pins are alternately assigned to the pressure side and the suction side.
  • the elongated plug-in pins are therefore expediently located near the pressure side and thus form a quasi-extension of the outer surface, with the next outer surface along the side edge
  • the elongated plug pin is then arranged on the suction side as an extension of the suction side.
  • the blades are inclined from the inside outward against the direction of travel and are designed as backward-curved blades.
  • the blade leading edge and/or trailing edge of a respective blade expediently has an arcuate shape extending from the cover disk toward the support disk.
  • blade halves prefferably be plastically formed before assembly, in particular by stamping, in order to produce convexly curved inner sections.
  • the blades are positively connected to the cover and support disk via the combination of the plug-in pins on the receiving slots and then the plug-in pins are welded to the receiving slots.
  • the Figures 1 to 8 show a preferred embodiment of the radial impeller 11 according to the invention.
  • the radial impeller which for the sake of simplicity could also be referred to as an impeller, is a component of a radial fan (not shown), which additionally has a fan drive (not shown) via which the radial impeller 11 can be driven in rotation.
  • the radial fan can be one with a belt drive or with a direct drive. In the former case, a belt ensures the power transmission from the fan drive to the radial fan wheel 11.
  • the fan drive can be attached to the radial impeller, for example by a drive shaft of the fan drive being coupled to a hub arrangement 13 of the radial impeller 11, which hub arrangement is formed on a support disk 12.
  • the radial impeller 11 has a cover plate 14 which has a circular inlet opening 15 that defines an intake diameter.
  • the inlet opening 50 is located on a nozzle 15 protruding from the outside of the cover plate, which expands inward in a trumpet-shaped manner in the axial direction along a rotation axis 16.
  • the trumpet-shaped expansion of the nozzle 15 ensures improved deflection from the axial to the radial flow direction.
  • the radius of the curvature can, for example, be in the range of 10% to 30% of the intake diameter.
  • a support disk 12 is provided, which is arranged coaxially with the cover disk 14.
  • the cover and support disks 12, 14 are connected to each other via a blade ring 17.
  • the previously mentioned hub assembly 13 is located on the support disk 12 and serves for coupling to a drive shaft of a fan drive (not shown).
  • the outer diameter of the support disk 12 is smaller than or approximately equal to the outer diameter of the cover disk 14.
  • the blade ring 17 consists of several blades 18, each inclined from the inside outward against the direction of travel. In the present example, backward-curved blades 18 are provided.
  • the blades 18 each have two opposing side edges 19a, 19b, one of which is connected to the cover plate 14 and the other to the support plate 12.
  • the side edges 19a, 19b each extend between a blade leading edge 20 and a blade trailing edge 21 opposite one another in the impeller's circumferential direction.
  • the blades 18 are each designed as a hollow profile and have two adjacent attached and in the area of the blade leading edge 20 and the blade trailing edge 21 each welded together by a welded joint 22, blade halves 24, 25 defining a cavity 23 between them.
  • the blades 18 each have an inlet end region 26 which tapers towards the blade leading edge 20 and which is formed by convexly curved end sections 29, 30 of the two blade halves 24, 25 facing away from one another, such that the inlet end region 26 has a continuously curved outer contour extending over both blade halves 24, 25.
  • the blades 18 are each twisted within themselves, ie the opposite side edges 19a, 19b of a respective blade 18 have different courses from one another.
  • the convexly curved end sections 29, 30 are each formed as forming sections produced by plastic forming, in particular stamping, of a blade half blank without cutting.
  • the blades 18 are each made of aluminum or an aluminum alloy. Combined with the hollow profile of the blades, this results in a weight saving compared to conventional blades made of solid sheet steel.
  • the blades 18 are shown as hollow profile blades.
  • the blade geometry can be formed from several axially offset sections perpendicular to the axis of rotation. Different inlet and outlet angles as well as Diameter ratios and blade radii are used.
  • the final shape of the hollow profile blade is formed from the blade geometry and a superimposed NACA profile geometry.
  • the blades can therefore be designed like an airfoil profile.
  • the meridian contour 31 at the blade trailing edge 21 of the radial impeller 11 determines, in particular, the final shape of the blade 18.
  • An important parameter for the inflow of the blades 18 is the so-called blade inlet angle ⁇ 1 . This is formed as the angle of a tangent to an inner root point of the blade 18 and a circumferential tangent passing through this root point.
  • the blade inlet angle ⁇ 1,TS is different in the area of the main disk from the blade inlet angle ⁇ 1,DS in the area of the shroud.
  • the blade trailing edge 21 is arranged opposite the blade leading edge 20.
  • a blade trailing angle ⁇ 2 is formed at the blade trailing edge 21, which is defined as the angle of a tangent to an outer root point of the blade to the circumferential tangent passing through this root point.
  • the blade trailing angle ⁇ 2,TS in the area of the support disk can also be different from the blade trailing angle ⁇ 2,DS in the area of the shroud.
  • the blades 18 are each formed by assembling the two blade halves 24, 25 and subsequently welding them in the area of the blade leading edge 20 and the blade trailing edge 21.
  • the welded connection provided for this purpose can expediently be designed as a laser-welded joint, whereby the heat input into the blade halves to be welded is relatively low during the welding process.
  • the blades are expediently formed at the blade leading edge 20 and the blade trailing edge 21 by means of a weld seam (not shown) extending over the entire length of the blade leading edge and the blade trailing edge 21.
  • a combination of a welded connection with a form-fitting connection is used as a fastening measure for fastening the blades 18 on the one hand to the cover disk 14 and on the other hand to the support disk 12.
  • the form-fitting connection is designed as a plug-in connection, with plug-in elements and counter-plug-in elements arranged on the one hand on the side edges 19a, b of the respective blade 18 and on the other hand on the cover or support disk 14, 12 and assigned to one another.
  • the plug-in elements are designed as elongated plug-in pins 32.
  • the elongated plug-in pins 32 could therefore also be referred to as plug-in tabs.
  • the mating plug-in elements are designed as receiving openings that accommodate the plug-in pins.
  • the receiving openings are designed as receiving slots 33.
  • the elongated plug pins 32 are adapted to the contour of the outer surfaces 27, 28 of the blade halves 24, 25 and are curved accordingly.
  • the contour of the receiving slots 33 is adapted to the contour of the elongated plug pins 32.
  • the opposing outer surfaces 27, 28 of a respective blade 18 are characteristically formed.
  • the front outer surface in the running direction, which belongs to the front blade half 24, could also be referred to as the pressure-side outer surface 27, while the other outer surface on the rear blade half can also be referred to as the suction-side outer surface 28.
  • the elongated plug pins 32 are arranged alternately on the suction and pressure sides, i.e. alternately in the area of the pressure-side outer surface 27 and the suction-side outer surface 28.
  • the design of the plug-in pins 32 can also already be carried out during the production of the two blade halves 24, 25, for example by punching out or stamping the elongated plug-in pins from a blade half blank.
  • the production of the radial impeller 11 essentially proceeds as follows: First, the two blade halves 24, 25 are prepared and assembled in such a way that a hollow profile is formed, and the two blade halves 24, 25 together form a blade leading edge 20 and a blade trailing edge 21. Next, of course, the two blade halves 24, 25 must be connected or fastened to one another, which is done by welding the two blade halves 24, 25 in the area of the blade leading edge 20 and in the area of the blade trailing edge 21. This creates a hollow profile blade.
  • a characteristic feature of the manufacturing process is that the blade halves 24, 25 were machined by plastic forming, particularly stamping, before being prepared and assembled.
  • a convexly curved end section 29 was formed from a blade half blank. This convexly curved end section 29, together with the convexly curved end section 30 of the other blade half, forms the characteristically shaped inlet end region 26, which extends over both blade halves 24, 25 with a continuously curved outer contour.
  • the finished blades 18 are connected to the support disk 12 on the one hand and the cover disk 14 on the other hand by inserting the elongated plug pins 32 on the side edges of the blades 18 into the receiving slots 33 on the support disk 12 on the one hand and into the receiving slots 33 on the cover disk 14 on the other.
  • the resulting plugs are then welded from the outside, i.e., from the outer side of the support disk 12 or the cover disks 14 facing away from the blade ring.
  • Laser welding is also a suitable welding method here to reduce heat input.
  • welding can also be carried out from the inside to stabilize the connection.

Landscapes

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

Claims (14)

  1. Impulseur radial, comportant un flasque (14) de couvercle ayant une ouverture (50) d'entrée et un flasque (12) de support, qui sont reliés l'un à l'autre par l'intermédiaire d'une couronne (17) d'aubes ayant plusieurs aubes (18), les aubes (18) comportant chaque fois deux bords (19a, 19b) latéraux opposés l'un à l'autre, dont l'un est relié au flasque (14) de couvercle et l'autre au flasque (12) de support, les bords (19a, 19b) latéraux s'étendant respectivement entre un bord (20) d'entrée d'aube et un bord (21) de sortie d'aube en sens opposé dans une direction périphérique de l'impulseur, les aubes (18) étant réalisées chacune en profilé creux et comportant deux moitiés (24, 25) d'aube assemblées l'une à l'autre et reliées l'une à l'autre respectivement par l'intermédiaire d'une liaison par soudure dans la zone du bord (20) d'entrée d'aube et du bord (21) de sortie d'aube et délimitant entre elles une cavité (23), les aubes (18) comportant chacune une zone (26) d'extrémité d'entrée se rétrécissant en direction du bord (20) d'entrée d'aube, caractérisé en ce que la zone (26) d'entrée est formée par des parties (29, 30) d'extrémité des deux moitiés (24, 25) d'aube bombées de manière convexe sur les surfaces (27, 28) extérieures non tournées l'une vers l'autre des moitiés (24, 25) d'aube, de telle manière que la zone (26) d'extrémité d'entrée a un contour extérieur incurvé généralement s'étendant sur les deux moitiés (24, 25) d'aube.
  2. Impulseur radial suivant la revendication 1, caractérisé en ce que les parties (29, 30) d'extrémité bombées de manière convexe sont réalisées respectivement en tant que parties déformées produites sans copeau par déformation plastique, notamment estampage d'une ébauche de moitié d'aube.
  3. Impulseur radial suivant l'une des revendications précédentes, caractérisé en ce que la liaison par soudure est une liaison par soudure au laser.
  4. Impulseur radial suivant l'une des revendications précédentes, caractérisé en ce que la liaison par soudure comporte au moins un cordon de soudure s'étendant essentiellement sur toute la longueur du bord (20) d'entrée d'aube et/ou du bord (21) de sortie d'aube.
  5. Impulseur radial suivant l'une des revendications précédentes, caractérisé en ce que les aubes (18) sont réalisées en tant que pièces constitutives distinctes du flasque (14) de couvercle et du flasque (12) de support et sont reliées par des mesures de fixation respectivement dans la zone de leurs bords (19a, 19b) latéraux d'un côté au flasque (14) de couvercle et de l'autre côté au flasque (12) de support.
  6. Impulseur radial suivant la revendication 5, caractérisé en ce que les mesures de fixation comprennent une liaison par soudure, par laquelle les aubes (18) sont soudées, respectivement d'un côté au flasque (14) de couvercle et de l'autre côté au flasque (12) de support.
  7. Impulseur radial suivant la revendication 6, caractérisé en ce que les mesures de fixation comprennent, en plus de la liaison par soudure, une liaison par complémentarité de forme, par laquelle les aubes (18) sont reliées d'un côté au flasque (14) de couvercle et de l'autre côté au flasque (12) de support, la liaison par complémentarité de forme étant réalisée, de préférence en tant que liaison par enfichage, avec des éléments d'enfichage et des éléments de contre-enfichage associés les uns aux autres, réalisés d'un côté sur les bords latéraux des aubes (18) associées et d'autre part sur les flasques (12, 14) de couvercle ou de support.
  8. Impulseur radial suivant la revendication 7, caractérisé en ce que les éléments d'enfichage sont réalisés en tant que broches (32) d'enfichage, en particulier oblongues, de préférence en tant que baguettes d'enfichage, et les éléments de contre-enfichage étant réalisés en tant qu'ouvertures de réception recevant les broches (32) d'enfichage, en particulier en tant que fentes (33) de réception, de préférence les broches (32) d'enfichage étant disposées sur les aubes (18) et les ouvertures de réception sur les flasques (12, 14) de couvercle et de support.
  9. Impulseur radial suivant la revendication 8, caractérisé en ce que les broches (32) d'enfichage oblongues sont adaptées aux contours des surfaces (27, 28) extérieures des moitiés (24, 25) d'aube, et sont également incurvées de manière convexe, le contour des fentes (33) de réception étant adapté au contour des broches (32) d'enfichage oblongues.
  10. Impulseur radial suivant l'une des revendications précédentes, caractérisé en ce que les aubes (18) sont inclinées de l'intérieur vers l'extérieur à l'encontre du sens de rotation et sont réalisées en forme d'aubes (18) incurvées vers l'arrière.
  11. Impulseur radial suivant l'une des revendications précédentes, caractérisé en ce que le bord (20) d'entrée d'aube et/ou le bord (21) de sortie d'aube d'une aube (18) respective a un contour en forme d'arc à partir du flasque (14) de couvercle en direction du flasque (12) de support.
  12. Procédé de fabrication d'un impulseur radial (11) suivant l'une des revendications 1 à 11, le procédé comportant les étapes suivantes :
    - on se procure deux moitiés (24, 25) d'aube, qui comportent chacune une partie (29, 30) d'extrémité cintrée de manière convexe sur des surfaces (27, 28) extérieures non tournées l'une vers l'autre et on assemble les deux moitiés (24, 25) d'aube, de manière à former un profilé creux et les deux moitiés (24, 25) d'aube forment ensemble un bord (20) d'entrée d'aube et un bord (21) de sortie d'aube, dans lequel il est formé, par l'assemblage des deux parties (29, 30) d'extrémité cintrées de manière convexe, une zone (26) d'extrémité d'entrée, qui se rétrécit en direction du bord (20) d'entrée d'aube et qui comporte un contour extérieur incurvé généralement s'étendant sur les deux moitiés (24, 25) d'aube,
    - on soude les deux moitiés (24, 25) d'aube dans la zone de bord (20) d'entrée d'aube et du bord (21) de sortie d'aube pour former une aube (18),
    - on exécute les étapes de procédé précités pour fabriquer toutes les aubes (18) de la couronne (17) d'aubes,
    - on relie les aubes (18) dans la zone de leurs bords (19a, 19b) latéraux d'un côté au flasque (14) de couvercle et de l'autre côté au flasque (12) de support.
  13. Procédé suivant la revendication 12, caractérisé en ce que, avant l'assemblage, on déforme plastiquement, notamment on estampe, les moitiés (24, 25) d'aube pour produire des parties (29, 30) d'extrémité cintrées de manière convexe.
  14. Procédé suivant la revendication 12 ou 13, caractérisé en ce que l'on relie les aubes (18) par l'intermédiaire de la combinaison des broches (32) d'enfichage et des fentes (33) de réception en complémentarité de forme aux flasques (14, 12) de couvercle et de support et on soude ensuite les dispositifs d'enfichage des broches (32) d'enfichage aux fentes (33) de réception, le soudage s'effectuant, de préférence sur un côté extérieur du flasque (14) de couvercle et du flasque (12) de support non tourné vers la couronne (17) d'aubes.
EP21202991.2A 2021-10-15 2021-10-15 Rotor radial Active EP4166791B1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP21202991.2A EP4166791B1 (fr) 2021-10-15 2021-10-15 Rotor radial
AU2022252728A AU2022252728A1 (en) 2021-10-15 2022-10-11 Radial impeller
CA3179045A CA3179045A1 (fr) 2021-10-15 2022-10-12 Roue radiale
CN202211256923.4A CN115977997A (zh) 2021-10-15 2022-10-14 径向叶轮
US17/966,255 US12241475B2 (en) 2021-10-15 2022-10-14 Radial impeller

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP21202991.2A EP4166791B1 (fr) 2021-10-15 2021-10-15 Rotor radial

Publications (3)

Publication Number Publication Date
EP4166791A1 EP4166791A1 (fr) 2023-04-19
EP4166791B1 true EP4166791B1 (fr) 2025-10-01
EP4166791C0 EP4166791C0 (fr) 2025-10-01

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP21202991.2A Active EP4166791B1 (fr) 2021-10-15 2021-10-15 Rotor radial

Country Status (5)

Country Link
US (1) US12241475B2 (fr)
EP (1) EP4166791B1 (fr)
CN (1) CN115977997A (fr)
AU (1) AU2022252728A1 (fr)
CA (1) CA3179045A1 (fr)

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Publication number Priority date Publication date Assignee Title
US20260022707A1 (en) * 2024-07-19 2026-01-22 Greenheck Fan Corporation Three-dimensional airfoil and method of construction
US12473926B1 (en) 2024-08-14 2025-11-18 Morrison Products, Inc. Impellers and manufacturing methods thereof
CN120940989B (zh) * 2025-10-14 2025-12-30 成都永益泵业股份有限公司 一种开式渣浆泵叶轮生产工艺

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DE102014207903A1 (de) * 2014-04-28 2015-11-12 Ebm-Papst Mulfingen Gmbh & Co. Kg Schaufelkante
DE102014006756A1 (de) 2014-05-05 2015-11-05 Ziehl-Abegg Se Laufrad für Diagonal- oder Radialventilatoren, Spritzgusswerkzeug zur Herstellung eines solchen Laufrades sowie Gerät mit einem solchen Laufrad
CN212028170U (zh) * 2020-04-20 2020-11-27 杭州顿力电器有限公司 一种高效高强度的离心风轮

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AU2022252728A1 (en) 2023-05-04
EP4166791A1 (fr) 2023-04-19
US20230124865A1 (en) 2023-04-20
US12241475B2 (en) 2025-03-04
CA3179045A1 (fr) 2023-04-15
EP4166791C0 (fr) 2025-10-01
CN115977997A (zh) 2023-04-18

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