EP4015836A1 - Roue du ventilateur comprenant une bague de renfort - Google Patents

Roue du ventilateur comprenant une bague de renfort Download PDF

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Publication number
EP4015836A1
EP4015836A1 EP21207483.5A EP21207483A EP4015836A1 EP 4015836 A1 EP4015836 A1 EP 4015836A1 EP 21207483 A EP21207483 A EP 21207483A EP 4015836 A1 EP4015836 A1 EP 4015836A1
Authority
EP
European Patent Office
Prior art keywords
fan wheel
blades
axial projections
wheel according
wheel blades
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.)
Pending
Application number
EP21207483.5A
Other languages
German (de)
English (en)
Inventor
Martin Baer
Walter Hofmann
Michael Strehle
Christoph CARLE
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.)
Ebm Papst Mulfingen GmbH and Co KG
Original Assignee
Ebm Papst Mulfingen GmbH and Co KG
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 Ebm Papst Mulfingen GmbH and Co KG filed Critical Ebm Papst Mulfingen GmbH and Co KG
Publication of EP4015836A1 publication Critical patent/EP4015836A1/fr
Pending 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
    • F04D29/26—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
    • F04D29/02—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
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/60—Mounting; Assembling; Disassembling
    • F04D29/62—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps
    • F04D29/624—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
    • F04D29/626—Mounting or removal of fans

Definitions

  • the invention relates to a fan wheel of a blower with a reinforcement ring.
  • Generic fan wheels for blowers or fans are known from the prior art in a large number of variants, for example as axial, radial or diagonal impellers with a base disk on which a plurality of fan wheel blades is arranged, and optionally a cover disk covering the fan wheel blades.
  • the object of the invention is therefore to provide a fan wheel with increased strength, particularly in this critical area.
  • a fan wheel is proposed with at least one base disk and a plurality of fan wheel blades formed around an axis of rotation of the fan wheel, which extend in the axial direction starting from the base disk and each form a flow channel between them together with the base disk.
  • a reinforcement ring is arranged inside the bottom disk, which has a plurality of axial projections which extend in the axial direction into the fan wheel blades and thereby reinforce both the bottom disk and the fan wheel blades.
  • the reinforcement ring specially designed with the axial projections is accommodated in the disk body of the bottom disk, with the axial projections extending exactly at the point axially parallel to the axis of rotation of the fan wheel, so that the fan wheel blades enclose the axial projections.
  • This increases the fan wheel strength locally, but also overall, and enables higher loads.
  • the choice of material for the fan wheel is more variable.
  • the reinforcement ring it is also possible to use more cost-effective materials for the fan wheel body, which nevertheless meet the technical requirements through the use of the reinforcement ring.
  • the freedom of design in critical areas, such as the impeller blade design and the transition between the bottom disk and the fan wheel blades, is also increased.
  • the geometric The design of the reinforcement ring is also variable and can be adapted to the different demands in the respective operation.
  • the reinforcement ring required for the respective fan wheel can be selected from a set of reinforcement rings.
  • the required strength is achieved in particular with fan wheels made of plastic.
  • the fan impeller achieves a high level of corrosion resistance. It is therefore provided in a favorable embodiment of the fan wheel that the reinforcement ring is formed from a material whose strength is higher than that of the material of the fan wheel body. Plastic is preferably selected for the fan wheel and metal for the reinforcement ring as a combination of materials.
  • a geometric shape of the axial projections corresponds to a geometric shape of the fan wheel blades, with the fan wheel blades completely enclosing the axial projections.
  • the fan wheel blades can have different configurations, for example running in a straight line, curved forwards or curved backwards.
  • the axial projections are preferably formed in the same shape and reinforce the fan wheel blades not only at certain points, but at least in sections along their extension.
  • a configuration of the fan wheels is favorable in which the axial projections within the fan wheel blades extend over at least 30%, more preferably over at least 50%, more preferably over at least 70% of a total extension of the fan wheel blades from a radial inside to a radial outside of the fan wheel.
  • the reinforcement effect increases the longer the fan wheel blades and the axial projections overlap in their respective extent.
  • the axial projections are at a center of the overall extension of the fan wheel blades extend from the radial inside to the radial outside of the fan wheel.
  • an advantageous embodiment of the fan wheel provides that the axial projections within the fan wheel blades extend over at least 10%, more preferably at least 20%, more preferably at least 30% of an overall axial extension of the fan wheel blades, starting from the base disk.
  • the axial extent runs parallel to the axis of rotation. Even a small extension in the axial direction has a positive influence, since the critical transition area from the base disk to the fan wheel blades is reinforced by the reinforcement ring. A longer axial extension of the axial projections strengthens the fan wheel blades in particular and consequently the fan wheel as a whole.
  • the fan wheel is characterized in that the reinforcement ring is designed as a one-piece closed ring. The entire bottom disk is thus reinforced over its entire circumference.
  • a favorable embodiment also provides that the reinforcement ring has a large number of holes in a hole pattern.
  • the holes reduce the amount of material used and thus the weight of the reinforcement ring. This in turn reduces the mass of the fan wheel and the forces acting during operation. In addition, the holes improve the connection to the fan wheel body.
  • a further development of the fan impeller is characterized in that the hole pattern is designed in such a way that radially adjacent holes are offset from one another in the circumferential direction. With round holes, these can be placed closer together. In addition, the weakening of the material produced by the respective hole does not overlap.
  • the reinforcement ring as a whole remains stable despite a large number of holes with such a hole pattern.
  • a hole total cross-sectional area in Reinforcement ring is preferably over 50%, in particular over 75% of the area of the reinforcement ring.
  • An alternative hole shape is characterized by hexagons and the hole pattern in particular by a honeycomb pattern.
  • a further advantageous embodiment of the fan impeller provides that the reinforcing ring has radial expansions that are locally restricted in the circumferential direction. Such radial extensions protrude in a locally limited manner in relation to the annular course of the outer peripheral edge of the fan wheel and locally increase the ring surface by radially increasing the extension of the reinforcement ring.
  • a particularly advantageous embodiment of the fan wheel is characterized in that the respective radial extensions are provided in a region of the reinforcement ring in which the axial projections are formed.
  • the radial extensions and the axial projections lie in a radial plane that runs through the axis of rotation of the fan wheel.
  • the reinforcement ring therefore has an increased area and accumulation of material precisely in the area in which the axial projections are also formed, in order to increase the strength.
  • the axial projections are formed eccentrically in relation to the radial expansion, as seen in the circumferential direction. Due to the rotation of the fan wheel during operation, the load on the blade front edge and the blade rear edge of the fan wheel blades is different. This also results in different loads in the critical area of the transition to the floor pane. The off-centre positioning takes this into account and enables a particularly strong increase in strength, which has a positive effect on the operation, i.e. the rotation of the fan wheel.
  • the radial extensions each have two special designed peripheral edge portions. It is provided that the peripheral edge sections each have different angles with respect to a tangent applied to the outer edge of the reinforcing ring. The different angles also take into account the fact that the load varies depending on the direction of rotation of the fan wheel.
  • a design of the fan wheel in which the angles are adapted to the angle of inclination of the fan wheel blades relative to the axis of rotation is particularly favorable. For example, in the case of backward-curved fan wheel blades, the angle of inclination is adjusted in the same backward direction, so that one of the peripheral edge sections and the fan wheel blades are matched to one another, in particular parallel or essentially parallel, and run out radially outward.
  • the figures 1 and 2 show an example of an embodiment of a fan wheel 1 in sectional views, wherein in figure 1 for a better understanding of the invention, the hidden edges are also shown.
  • the fan wheel 1 is formed from a base disk 2 , a cover disk 3 and a plurality of fan wheel blades 4 which are formed around the axis of rotation RA and which extend in the axial direction between the base disk 2 and the cover disk 3 and in each case form a flow channel between them.
  • the fan wheel blades 4 are shown curved, but can also be formed, for example, in a straight line.
  • the bottom disk 2 merges into a receptacle 5 for connecting a drive for the fan wheel 1 .
  • the cover disk 3, the base disk 2 and the fan wheel blades 4 form the fan wheel body and are made of plastic in one piece using a casting process, in particular an injection molding process.
  • a casting process in particular an injection molding process.
  • the reinforcing ring 6, which is preferably made of metal and is introduced using the casting process, in particular the injection molding process.
  • the reinforcement ring 6 is individually in figure 3 shown. It is designed as a one-piece, closed ring with a flat annular body 77, which has a plurality of radial extensions 8, each of which is of the same shape, distributed in the circumferential direction. In the area of the radial extensions 8, the area of the annular body 77 is locally enlarged. Each of the radial extensions 8 forms two peripheral edge sections 9, 9', in which the overall radius of the reinforcing ring 6 increases. In the embodiment variant shown, the circumferential edge sections 9, 9' each have different angles ⁇ and ⁇ with respect to a tangent applied to the outer edge of the reinforcing ring 6, where ⁇ applies.
  • angles ⁇ and ⁇ are adapted to the respective angle of inclination of the fan wheel blades 4 relative to the axis of rotation RA, ie the angles can be different if the curvature of the wheel blades 4 changes.
  • the course of the radial extensions 8 between the two peripheral edge sections 9, 9' corresponds to that of the rest of the annular body 77 between the radial extensions 8.
  • axial projections 7 extend from the surface of the ring body 77 in the axial direction.
  • the axial projections 7 are curved in the circumferential direction in the same way as the fan wheel blades 4.
  • the axial projections 7 extend in the axial direction Direction into the fan wheel blades 4 inside.
  • figure 2 shows that the geometric shape of the axial projections 7 corresponds to the geometric shape of the fan wheel blades 4 and the fan wheel blades 4 completely enclose the axial projections 7 .
  • the axial projections 7 and the radial extensions 8 are provided in the same circumferential section. Viewed in projection, the respective axial projection 7 overlaps the respective peripheral edge section 9'.
  • the axial projections 7 are therefore formed eccentrically in relation to the radial extensions 8 when viewed in the circumferential direction.
  • Each of the axial projections 7 has at least one nipple 21 which projects in relation to the inner and outer wall surfaces of the respective axial projection 7 and which is in engagement with the fan wheel body of the fan wheel blades 4 .
  • the ring body 77 of the reinforcement ring 6 has a large number of hexagonal holes 10 distributed over the entire circumference, which are positioned in a hole pattern relative to one another such that radially adjacent holes 10 are offset from one another with respect to their respective centers in the circumferential direction. This results in a honeycomb structure of the holes 10. It is also possible and covered by the disclosure for the holes 10 to be arranged partially overlapping one another on the ring body 77, viewed in radial projection. The radial extensions 8 are free of holes 10.
  • the size of the axial projections 7 in relation to the impeller blades 4 is also shown.
  • the axial projections 7 within the fan wheel blades 4 extend over a length L of 60% of the total extension S of the fan wheel blades 4 from the radial inside to a radial outside of the fan wheel 1.
  • the axial projections 7 are positioned centrally within the fan wheel blades 4 and therefore also extend the middle of their total extent, see in particular figure 2 .
  • the axial projections 7 extend inside along the axis of rotation RA the fan wheel blades 4 over at least 15% of the total axial extent H of the fan wheel blades 4, see figure 1 .
  • the invention is not limited in its implementation to the preferred exemplary embodiment given above. Rather, a number of variants are included, which make use of the solution shown even in the case of fundamentally different designs. Even if a large number of the features disclosed are shown in their entirety in the figures, this is for better understanding. However, designs are also included which only take certain of the disclosed features into account, for example a perforation with a specific hole pattern does not necessarily have to be implemented. In addition, the proportions in the specified areas can be adjusted.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP21207483.5A 2020-12-16 2021-11-10 Roue du ventilateur comprenant une bague de renfort Pending EP4015836A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102020133825.2A DE102020133825A1 (de) 2020-12-16 2020-12-16 Lüfterrad mit Verstärkungsring

Publications (1)

Publication Number Publication Date
EP4015836A1 true EP4015836A1 (fr) 2022-06-22

Family

ID=78598790

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21207483.5A Pending EP4015836A1 (fr) 2020-12-16 2021-11-10 Roue du ventilateur comprenant une bague de renfort

Country Status (3)

Country Link
EP (1) EP4015836A1 (fr)
CN (1) CN114635873A (fr)
DE (1) DE102020133825A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4762465A (en) * 1985-06-29 1988-08-09 Klifa-Fahrzeugteile Gmbh + Co. Water pump impeller
US20050106024A1 (en) * 2001-09-28 2005-05-19 Valeo Equipements Electriques Moteur Alternator fan
WO2020143241A1 (fr) * 2019-01-12 2020-07-16 中山宜必思科技有限公司 Roue de ventilateur centrifuge, et procédé de fabrication pour celle-ci et ventilateur centrifuge l'utilisant

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1397705B1 (it) * 2009-07-15 2013-01-24 Nuovo Pignone Spa Metodo di produzione di uno strato di rivestimento per un componente di una turbomacchina, il componente stesso e la relativa macchina
CN101749270B (zh) * 2010-01-21 2013-05-22 东莞市金鑫智能机械设备有限公司 一种离心风机的叶轮
CN107781213A (zh) 2017-10-19 2018-03-09 卧龙电气集团股份有限公司 一种循环风机及其扇叶结构
CN209687789U (zh) * 2019-01-12 2019-11-26 中山宜必思科技有限公司 一种离心风轮及应用其的离心风机

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4762465A (en) * 1985-06-29 1988-08-09 Klifa-Fahrzeugteile Gmbh + Co. Water pump impeller
US20050106024A1 (en) * 2001-09-28 2005-05-19 Valeo Equipements Electriques Moteur Alternator fan
WO2020143241A1 (fr) * 2019-01-12 2020-07-16 中山宜必思科技有限公司 Roue de ventilateur centrifuge, et procédé de fabrication pour celle-ci et ventilateur centrifuge l'utilisant

Also Published As

Publication number Publication date
CN114635873A (zh) 2022-06-17
DE102020133825A1 (de) 2022-06-23

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