EP2522858B1 - Radial fan for suction hood - Google Patents

Radial fan for suction hood Download PDF

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Publication number
EP2522858B1
EP2522858B1 EP12166751.3A EP12166751A EP2522858B1 EP 2522858 B1 EP2522858 B1 EP 2522858B1 EP 12166751 A EP12166751 A EP 12166751A EP 2522858 B1 EP2522858 B1 EP 2522858B1
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EP
European Patent Office
Prior art keywords
delivery unit
radial fan
additional delivery
collar
air
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
EP12166751.3A
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German (de)
French (fr)
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EP2522858A3 (en
EP2522858A2 (en
Inventor
Josef Wurm
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.)
BSH Hausgeraete GmbH
Original Assignee
BSH Hausgeraete GmbH
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Publication date
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Publication of EP2522858A2 publication Critical patent/EP2522858A2/en
Publication of EP2522858A3 publication Critical patent/EP2522858A3/en
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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
    • F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F04D17/08—Centrifugal pumps
    • F04D17/16—Centrifugal pumps for displacing without appreciable compression
    • F04D17/162—Double suction 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
    • F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F04D17/02—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps having non-centrifugal stages, e.g. centripetal
    • F04D17/025—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps having non-centrifugal stages, e.g. centripetal comprising axial flow and radial flow stages
    • 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
    • F04D29/26—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

Definitions

  • the present invention relates to a radial fan wheel according to the preamble of patent claim 1 and a household appliance according to the preamble of patent claim 7.
  • a cooking appliance has a fan unit which comprises at least one motor arranged in an engine compartment. At least one fan arranged in the cooking chamber can be driven via this with a drive shaft guided through a partition wall.
  • the blower unit has an additional delivery unit for generating a gas pressure that seals the engine compartment against vapor.
  • a two-stage blower for a hand dryer is known.
  • an axially sucking in and radial blowing out drum rotor is combined with an axially conveying impeller.
  • the JP 51 036 111 U shows a radial fan wheel with an upstream pulley, the spokes of which are designed like wings, causing an air flow in the axial direction.
  • the US 2011/079374 A1 discloses a heat dissipation system for electronic components.
  • the system includes a housing which is divided into first and second air ducts by a partition wall.
  • a drive unit is mounted in the first air duct.
  • a rotating axle of the drive unit extends through an opening in the second air duct.
  • a first impeller is mounted in the first air duct and a second impeller is mounted in the second air duct.
  • the invention is based on the object of improving the mode of operation of the radial fan wheel from the prior art.
  • the additional conveyor unit is surrounded by an annular collar, the collar being arranged on the separating plate, and wherein the additional conveyor unit is an axial additional conveyor unit and the air blades of the additional conveyor unit are arranged within the collar.
  • the air blades of the additional delivery unit result in an improved delivery rate, which is also easy to control thanks to the geometric design of the air blades.
  • the entire volume of air sucked in by the additional delivery unit is preferably delivered radially outward via the main delivery unit.
  • the additional conveying unit is surrounded by an annular collar, which, due to the stiffening effect of the collar, creates a stable radial fan wheel that has low-vibration running properties.
  • the collar is arranged on the partition plate. This enables a compact design and also favors the design of the radial fan wheel as a plastic injection-molded part.
  • the air blades of the additional delivery unit generate an air flow along an axis of rotation of the fan wheel.
  • a blow-out area of the additional delivery unit opens in the suction area of the main delivery unit.
  • the air blades of the additional delivery unit are at least partially arranged in an opening in the partition plate. This enables a particularly flat design of the radial fan wheel, especially when the additional delivery unit does not protrude, or only protrudes slightly, over the partition plate. An air throughput of the additional delivery unit can be controlled via the cross section of the opening.
  • the additional delivery unit is arranged within an opening delimited by the collar. This creates a defined, clearly delimited flow channel of the additional delivery unit. This flow channel can easily be coupled to adjacent flow channels with sufficient tightness.
  • the collar has a height of 2 to 10 mm, preferably 3 to 8 mm. This enables a compact design of the radial fan wheel and, moreover, ensures sufficient coverage in the event of the collar dipping into an adjacent air duct. This Covering or overlapping creates a seal and largely prevents the sucking in of defective air.
  • the air blades of the additional delivery unit form a mechanical connection between a drive axle receptacle arranged along the central axis and the partition plate enables material to be saved in the manufacture of the radial fan wheel.
  • the air blades preferably form the sole mechanical connection between the drive axle receptacle and the partition plate.
  • the air blades are arranged in two superposed planes, whereby the air throughput is increased again. In addition, this enables a more stable connection of the drive axle receptacle to the partition plate.
  • the invention also relates to a domestic appliance with a radial fan wheel according to the invention, the collar of which is immersed in an intake duct.
  • Coupling between the radial fan wheel and the intake duct of the household appliance enables a particularly tight interface to be achieved.
  • the separating plate of the radial fan wheel has a certain distortion due to the manufacturing process, or a certain flatness tolerance.
  • the formation of a collar which dips into the suction hole or into the suction channel, prevents such a suction of defective air.
  • the radial fan wheel in Figure 1 has a partition plate 2, in the center of which a drive axle receptacle 4 is arranged. This is designed in the form of a sleeve and serves to accommodate a motor axis of a fan motor (not shown). To accommodate the motor shaft, the drive shaft receptacle 4 has a receptacle opening 5 into which the motor shaft (not shown) is inserted.
  • the drive axle receptacle 4 is connected to the partition plate 2 via four holding webs 6.
  • a main delivery unit 8 in the form of air blades 10 is arranged on the partition plate 2. The air blades 10 of the main conveyor unit 8 extend from an outer circumference of the partition plate 2 radially inward in the direction of the drive axle receptacle 4.
  • the air blades 10 of the main conveyor unit 8 are arcuate and have a height H.
  • the air blades 10 end in front of a circular opening 11, which is arranged in the middle of the partition plate 2 is and in the center of which the drive axle receptacle 4 forms.
  • the opening 11 has an additional delivery unit 12 which is formed by four air blades 14.
  • the air blades 14 are designed in such a way that they cause an air flow in the direction of an axis 18.
  • the axis 18 forms the axis of rotation of the drive axis receptacle or the entire radial fan wheel.
  • Figure 2 shows a collar 16 formed on an underside of the radial fan wheel, the inner diameter of which corresponds to the diameter of the opening 11.
  • the air blades 14 of the additional delivery unit 12 are arranged inside the collar 16. In addition, they are each arranged centrally along an angle bisector in intermediate spaces 17 formed by the holding webs 6. In accordance with the stability requirements, it is also possible in an alternative embodiment (not shown) to also design the retaining webs 6 in the form of air blades 14.
  • the additional delivery unit 12 is thus composed of two rows of air blades 14 which are arranged at a distance from one another in the axial direction with respect to the axis 18.
  • the two rows of air blades 14 are arranged offset from one another in such a way that the resulting gaps between the air blades 14 are of equal size.
  • the air blades 14 of the additional delivery unit 12 are inclined in the direction of the axis 18 in such a way that they cause an air flow along the axis 18.
  • the representation in Figure 3 shows schematically the radial fan wheel built into a cooking appliance.
  • the radial fan wheel serves to generate a cooling air flow LK, which is used to cool a switch area of the cooking appliance (not shown).
  • the radial fan wheel through its additional delivery unit 12, removes vapors from an oven muffle 19 of the cooking appliance, which is surrounded by insulation 23.
  • the extracted vapor is mixed with the cooling air flow LK.
  • the cooling air flow LK is formed via a suction area AH of the main conveyor unit 8 arranged at the top and is conveyed radially outward into a blow-out area A via the main conveyor unit 8.
  • the circular suction area AH of the main conveyor unit 8 is arranged centrally above the main conveyor unit 8.
  • the axis 18 forms the center of the suction area AH.
  • a vapor air flow LW is additionally sucked in via a suction area AZ of the additional delivery unit 12.
  • the vapor air flow LW is conveyed by means of the air blades 14 of the additional conveyor unit 12 to the main conveyor unit 8 arranged above the partition plate 2.
  • the vapor air flow LW from the suction area AZ of the additional conveyor unit 12 and the cooling air flow LK result in a mixed air flow LM which is conveyed via the blow-out area A into a blow-out duct 22.
  • a gap S between the partition plate 2 and a cover plate 20 arranged on the insulation 23 can be chosen generously, since the collar 16 is designed in such a way that it dips into the intake duct 21 and thereby largely prevents the sucking in of defective air via the gap S.

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

Description

Die vorliegende Erfindung betrifft ein Radiallüfterrad gemäß dem Oberbegriff des Patentanspruchs 1 und ein Haushaltsgerät gemäß dem Oberbegriff des Patentanspruchs 7.The present invention relates to a radial fan wheel according to the preamble of patent claim 1 and a household appliance according to the preamble of patent claim 7.

Ein derartiges Radiallüfterrad ist bekannt aus der Druckschrift EP 1 306 623 B1 . Ein Gargerät weist dabei eine Gebläseeinheit auf, die zumindest einen in einem Motorraum angeordneten Motor umfasst. Über diesen ist mit einer durch eine Trennwand geführte Antriebswelle zumindest ein im Garraum angeordneter Lüfter antreibbar. Dabei weist die Gebläseeinheit eine Zusatzfördereinheit zur Erzeugung eines den Motorraum gegen Wrasen abdichtenden Gasdrucks auf.Such a radial fan wheel is known from the document EP 1 306 623 B1 . A cooking appliance has a fan unit which comprises at least one motor arranged in an engine compartment. At least one fan arranged in the cooking chamber can be driven via this with a drive shaft guided through a partition wall. The blower unit has an additional delivery unit for generating a gas pressure that seals the engine compartment against vapor.

Aus der DE 18 05 121 A1 ist ein zweistufiges Gebläse für einen Händetrockner bekannt. Zur Erhöhung der Luftförderleistung des Gebläses wird ein axial ansaugender und radial ausblasender Tromelläufer mit einem axial fördernden Flügelrad kombinert.From the DE 18 05 121 A1 a two-stage blower for a hand dryer is known. To increase the air flow rate of the blower, an axially sucking in and radial blowing out drum rotor is combined with an axially conveying impeller.

Die JP 51 036 111 U zeigt ein Radiallüfterrad mit einer vorgelagerten Riemenscheibe, dessen Speichen flügelartig ausgebildet sind wodurch eine Luftströmung in axialer Richtung bewirkt wird.The JP 51 036 111 U shows a radial fan wheel with an upstream pulley, the spokes of which are designed like wings, causing an air flow in the axial direction.

Die US 2011/079374 A1 offenbart ein System zur Hitzeabführung für elektronische Bauteile. Das System beinhaltet ein Gehäuse, das durch eine Trennwand in einen ersten und einen zweiten Luftkanal unterteilt ist. Ein Antriebsaggregat ist im ersten Luftkanal montiert. Eine rotierende Achse des Antriebsaggregates erstreckt sich durch eine Öffnung in den zweiten Luftkanal. Jeweils gekoppelt mit der rotierenden Achse ist ein erstes Flügelrad im ersten Luftkanal und ein zweites Flügelrad im zweiten Luftkanal montiert. Der Erfindung liegt die Aufgabe zugrunde, das Radiallüfterrad aus dem Stand der Technik in seiner Wirkungsweise zu verbessern.The US 2011/079374 A1 discloses a heat dissipation system for electronic components. The system includes a housing which is divided into first and second air ducts by a partition wall. A drive unit is mounted in the first air duct. A rotating axle of the drive unit extends through an opening in the second air duct. In each case coupled to the rotating axle, a first impeller is mounted in the first air duct and a second impeller is mounted in the second air duct. The invention is based on the object of improving the mode of operation of the radial fan wheel from the prior art.

Diese Aufgabe wird durch ein Radiallüfterrad mit den Merkmalen des Patentanspruchs 1, sowie durch ein Haushaltsgerät mit den Merkmalen des Patentanspruchs 7 gelöst.This object is achieved by a radial fan wheel with the features of claim 1 and by a household appliance with the features of claim 7.

Gemäß dem kennzeichnenden Teil des Patentanspruchs 1 ist die Zusatzfördereinheit von einem ringförmigen Kragen umgeben, wobei der Kragen auf der Trennplatte angeordnet ist, und wobei die Zusatzfördereinheit eine axiale Zusatzfördereinheit ist und die Luftschaufeln der Zusatzfördereinheit innerhalb des Kragens angeordnet sind. Die Luftschaufeln der Zusatzfördereinheit bewirken eine verbesserte Förderleistung, die durch die geometrische Auslegung der Luftschaufeln zudem gut steuerbar ist. Dabei wird bevorzugt das gesamte, von der Zusatzfördereinheit angesaugte Luftvolumen über die Hauptfördereinheit radial nach außen gefördert. Die Zusatzfördereinheit ist von einem ringförmigen Kragen umgeben, wodurch aufgrund der versteifenden Wirkung des Kragens ein stabiles Radiallüfterrad geschaffen ist, das schwingungsarme Laufeigenschaften aufweist. Der Kragen ist auf der Trennplatte angeordnet. Dies ermöglicht eine kompakte Bauweise und begünstigt zudem die Ausbildung des Radiallüfterrades als Kunststoffspritzgußteil.According to the characterizing part of claim 1, the additional conveyor unit is surrounded by an annular collar, the collar being arranged on the separating plate, and wherein the additional conveyor unit is an axial additional conveyor unit and the air blades of the additional conveyor unit are arranged within the collar. The air blades of the additional delivery unit result in an improved delivery rate, which is also easy to control thanks to the geometric design of the air blades. In this case, the entire volume of air sucked in by the additional delivery unit is preferably delivered radially outward via the main delivery unit. The additional conveying unit is surrounded by an annular collar, which, due to the stiffening effect of the collar, creates a stable radial fan wheel that has low-vibration running properties. The collar is arranged on the partition plate. This enables a compact design and also favors the design of the radial fan wheel as a plastic injection-molded part.

Bei einer bevorzugten Ausgestaltung erzeugen die Luftschaufeln der Zusatzfördereinheit einen Luftstrom entlang einer Drehachse des Lüfterrades. Dabei mündet ein Ausblasbereich der Zusatzfördereinheit im Ansaugbereich der Hauptfördereinheit.In a preferred embodiment, the air blades of the additional delivery unit generate an air flow along an axis of rotation of the fan wheel. A blow-out area of the additional delivery unit opens in the suction area of the main delivery unit.

In einer weiteren Ausgestaltung wird vorgeschlagen, dass die Luftschaufeln der Zusatzfördereinheit zumindest teilweise in einer Öffnung der Trennplatte angeordnet sind. Dies ermöglicht eine besonders flache Ausbildung des Radiallüfterrades insbesondere dann, wenn die Zusatzfördereinheit nicht, oder nur geringfügig über die Trennplatte hinausragt. Über den Querschnitt der Öffnung ist ein Luftdurchsatz der Zusatzfördereinheit steuerbar.In a further embodiment it is proposed that the air blades of the additional delivery unit are at least partially arranged in an opening in the partition plate. This enables a particularly flat design of the radial fan wheel, especially when the additional delivery unit does not protrude, or only protrudes slightly, over the partition plate. An air throughput of the additional delivery unit can be controlled via the cross section of the opening.

Bevorzugt ist es, wenn die Zusatzfördereinheit innerhalb einer vom Kragen eingegrenzten Öffnung angeordnet ist. Dadurch wird ein definierter, klar abgegrenzter Strömungskanal der Zusatzfördereinheit geschaffen. Dieser Strömungskanal ist mit hinreichender Dichtigkeit einfach an angrenzende Strömungskanäle ankoppelbar.It is preferred if the additional delivery unit is arranged within an opening delimited by the collar. This creates a defined, clearly delimited flow channel of the additional delivery unit. This flow channel can easily be coupled to adjacent flow channels with sufficient tightness.

In einer vorteilhaften Ausgestaltung der Erfindung weist der Kragen eine Höhe von 2 bis 10 mm, bevorzugt von 3 bis 8 mm auf. Dadurch ist eine kompakte Bauweise des Radiallüfterrades ermöglicht und zudem im Falle eines Eintauchens des Kragens in einen angrenzenden Luftkanal eine ausreichende Überdeckung gewährleistet. Diese Überdeckung bzw. Überlappung bewirkt eine Abdichtung und verhindert weitestgehend das Ansaugen von Fehlluft.In an advantageous embodiment of the invention, the collar has a height of 2 to 10 mm, preferably 3 to 8 mm. This enables a compact design of the radial fan wheel and, moreover, ensures sufficient coverage in the event of the collar dipping into an adjacent air duct. This Covering or overlapping creates a seal and largely prevents the sucking in of defective air.

Indem die Luftschaufeln der Zusatzfördereinheit eine mechanische Verbindung zwischen einer entlang der Mittelachse angeordneten Antriebsachsenaufnahme und der Trennplatte bilden, ist eine Materialeinsparung bei der Herstellung des Radiallüfterrades ermöglicht. Bevorzugt bilden die Luftschaufeln die alleinige mechanische Verbindung zwischen der Antriebsachsenaufnahme und der Trennplatte. In einer vorteilhaften Weiterbildung sind die Luftschaufeln dabei in zwei übereinanderliegenden Ebenen angeordnet, wodurch der Luftdurchsatz nochmals gesteigert wird. Zudem ist dadurch eine stabilere Anbindung der Antriebsachsenaufnahme an die Trennplatte ermöglicht.The fact that the air blades of the additional delivery unit form a mechanical connection between a drive axle receptacle arranged along the central axis and the partition plate enables material to be saved in the manufacture of the radial fan wheel. The air blades preferably form the sole mechanical connection between the drive axle receptacle and the partition plate. In an advantageous further development, the air blades are arranged in two superposed planes, whereby the air throughput is increased again. In addition, this enables a more stable connection of the drive axle receptacle to the partition plate.

Des Weiteren betrifft die Erfindung ein Haushaltsgerät mit einem erfindungsgemäßen Radiallüfterrad, wobei dessen Kragen in einen Ansaugkanal eintaucht. Durch eine derartigeThe invention also relates to a domestic appliance with a radial fan wheel according to the invention, the collar of which is immersed in an intake duct. By such a

Ankopplung zwischen Radiallüfterrad und dem Ansaugkanal des Haushaltsgerätes kann eine besonders dichte Schnittstelle erreicht werden. Die Trennplatte des Radiallüfterrades weist herstellungsbedingt einen gewissen Verzug, bzw. eine bestimmte Ebenheitstoleranz auf. Dadurch ist es erforderlich, einen gewissen Mindestabstand der Trennplatte gegenüber beispielsweise einer Fläche, die ein Ansaugloch des Haushaltsgerätes umgibt, einzuhalten. Dieser erforderliche Mindestabstand bewirkt jedoch ein Ansaugen von Fehlluft durch einen Spalt, der sich zwischen der das Ansaugloch umgebenden Fläche und der Trennplatte ergibt. Durch die Ausbildung eines Kragens, der in das Ansaugloch, bzw. in den Ansaugkanal eintaucht, wird ein derartiges Ansaugen von Fehlluft verhindert.Coupling between the radial fan wheel and the intake duct of the household appliance enables a particularly tight interface to be achieved. The separating plate of the radial fan wheel has a certain distortion due to the manufacturing process, or a certain flatness tolerance. As a result, it is necessary to maintain a certain minimum distance between the partition plate and, for example, a surface that surrounds a suction hole of the household appliance. This required minimum distance, however, causes defective air to be sucked in through a gap that results between the surface surrounding the suction hole and the partition plate. The formation of a collar, which dips into the suction hole or into the suction channel, prevents such a suction of defective air.

Weitere Merkmale und Vorteile der Erfindung ergeben sich aus der nachfolgenden Beschreibung eines Ausführungsbeispiels unter Bezugnahme auf die beigefügten Figuren.Further features and advantages of the invention emerge from the following description of an exemplary embodiment with reference to the accompanying figures.

Es zeigen:

Figur 1
das erfindungsgemäße Radiallüfterrad in einer räumlichen Darstellung von oben;
Figur 2
das Radiallüfterrad in einer räumlichen Darstellung von unten und
Figur 3
eine Prinzipdarstellung des in ein Gargerät eingebauten Radiallüfterrades.
Show it:
Figure 1
the radial fan wheel according to the invention in a spatial representation from above;
Figure 2
the radial fan wheel in a spatial representation from below and
Figure 3
a schematic diagram of the radial fan wheel built into a cooking appliance.

Das Radiallüfterrad in Figur 1 weist eine Trennplatte 2 auf, in dessen Zentrum eine Antriebsachsenaufnahme 4 angeordnet ist. Diese ist hülsenförmig ausgebildet und dient zur Aufnahme einer Motorachse eines Lüftermotors (nicht gezeigt). Zur Aufnahme der Motorachse weist die Antriebsachsenaufnahme 4 eine Aufnahmeöffnung 5 auf, in die die Motorachse (nicht gezeigt) gesteckt ist. Die Antriebsachsenaufnahme 4 ist über vier Haltestege 6 mit der Trennplatte 2 verbunden. Auf der Trennplatte 2 ist eine Hauptfördereinheit 8 in Form von Luftschaufeln 10 angeordnet. Die Luftschaufeln 10 der Hauptfördereinheit 8 erstrecken sich dabei von einem Außenumfang der Trennplatte 2 radial nach innen in Richtung der Antriebsachsenaufnahme 4. Die Luftschaufeln 10 der Hauptfördereinheit 8 sind dabei bogenförmig ausgebildet und weisen eine Höhe H auf. Die Luftschaufeln 10 enden vor einer kreisförmigen Öffnung 11, die in der Mitte der Trennplatte 2 angeordnet ist und in dessen Zentrum die Antriebsachsenaufnahme 4 bildet. Die Öffnung 11 weist eine Zusatzfördereinheit 12 auf, die durch vier Luftschaufeln 14 gebildet wird. Die Luftschaufeln 14 sind dabei derart ausgestaltet, dass sie einen Luftstrom in Richtung einer Achse 18 bewirken. Die Achse 18 bildet dabei die Rotationsachse der Antriebsachsenaufnahme, bzw. des gesamten Radiallüfterrades.The radial fan wheel in Figure 1 has a partition plate 2, in the center of which a drive axle receptacle 4 is arranged. This is designed in the form of a sleeve and serves to accommodate a motor axis of a fan motor (not shown). To accommodate the motor shaft, the drive shaft receptacle 4 has a receptacle opening 5 into which the motor shaft (not shown) is inserted. The drive axle receptacle 4 is connected to the partition plate 2 via four holding webs 6. A main delivery unit 8 in the form of air blades 10 is arranged on the partition plate 2. The air blades 10 of the main conveyor unit 8 extend from an outer circumference of the partition plate 2 radially inward in the direction of the drive axle receptacle 4. The air blades 10 of the main conveyor unit 8 are arcuate and have a height H. The air blades 10 end in front of a circular opening 11, which is arranged in the middle of the partition plate 2 is and in the center of which the drive axle receptacle 4 forms. The opening 11 has an additional delivery unit 12 which is formed by four air blades 14. The air blades 14 are designed in such a way that they cause an air flow in the direction of an axis 18. The axis 18 forms the axis of rotation of the drive axis receptacle or the entire radial fan wheel.

Figur 2 zeigt einen an einer Unterseite des Radiallüfterrades ausgebildeten Kragen 16, dessen Innendurchmesser dem Durchmesser der Öffnung 11 entspricht. Die Luftschaufeln 14 der Zusatzfördereinheit 12 sind dabei innerhalb des Kragens 16 angeordnet. Zudem sind sie jeweils mittig entlang einer Winkelhalbierenden in von den Haltestegen 6 gebildeten Zwischenräumen 17 angeordnet. Entsprechend den Anforderungen an die Stabilität ist es in einer alternativen Ausgestaltung (nicht gezeigt) auch möglich, die Haltestege 6 ebenfalls in Form von Luftschaufeln 14 auszubilden. Damit setzt sich die Zusatzfördereinheit 12 aus zwei Reihen von Luftschaufeln 14 zusammen, die bezüglich der Achse 18 in Achsrichtung beabstandet voneinander angeordnet sind. Bei einer Blickrichtung in Richtung der Achse 18 sind die beiden Reihen an Luftschaufeln 14 dabei derart zueinander versetzt angeordnet, dass die sich ergebenden Lücken zwischen den Luftschaufeln 14 gleich groß sind. Die Luftschaufeln 14 der Zusatzfördereinheit 12 sind dabei in beiden Ausgestaltungen derart in Richtung der Achse 18 geneigt, dass sie einen Luftstrom entlang der Achse 18 bewirken. Figure 2 shows a collar 16 formed on an underside of the radial fan wheel, the inner diameter of which corresponds to the diameter of the opening 11. The air blades 14 of the additional delivery unit 12 are arranged inside the collar 16. In addition, they are each arranged centrally along an angle bisector in intermediate spaces 17 formed by the holding webs 6. In accordance with the stability requirements, it is also possible in an alternative embodiment (not shown) to also design the retaining webs 6 in the form of air blades 14. The additional delivery unit 12 is thus composed of two rows of air blades 14 which are arranged at a distance from one another in the axial direction with respect to the axis 18. When looking in the direction of the axis 18, the two rows of air blades 14 are arranged offset from one another in such a way that the resulting gaps between the air blades 14 are of equal size. In both configurations, the air blades 14 of the additional delivery unit 12 are inclined in the direction of the axis 18 in such a way that they cause an air flow along the axis 18.

Die Darstellung in Figur 3 zeigt schematisch das in ein Gargerät eingebaute Radiallüfterrad. Das Radiallüfterrad dient dabei zur Erzeugung eines Kühlluftstromes LK, der zur Kühlung eines Schalterraumes des Gargerätes (nicht gezeigt) verwendet wird. Zudem bewirkt das Radiallüfterrad durch seine Zusatzfördereinheit 12 eine Abfuhr eines Wrasens aus einer, mit einer Isolierung 23 umgebenen Backofenmuffel 19 des Gargerätes. Der abgeführte Wrasen wird dabei mit dem Kühlluftstrom LK vermischt. Über einen oben angeordneten Ansaugbereich AH der Hauptfördereinheit 8 bildet sich im Betrieb der Kühlluftstrom LK aus, der über die Hauptfördereinheit 8 radial nach außen in einen Ausblasbereich A gefördert wird. Der kreisförmige ausgebildete Ansaugbereich AH der Hauptfördereinheit 8 ist dabei mittig oberhalb der Hauptfördereinheit 8 angeordnet. Die Achse 18 bildet dabei das Zentrum des Ansaugbereiches AH. Über einen Ansaugkanal 21 wird gegenüberliegend zum Ansaugbereich AH der Hauptfördereinheit 8 zusätzlich über einen Ansaugbereich AZ der Zusatzfördereinheit 12 ein Wrasenluftstrom LW angesaugt. Durch die Öffnung 11 wird der Wrasenluftstrom LW mittels der Luftschaufeln 14 der Zusatzfördereinheit 12 zur oberhalb der Trennplatte 2 angeordneten Hauptfördereinheit 8 gefördert. Der Wrasenluftstrom LW aus dem Ansaugbereich AZ der Zusatzfördereinheit 12 und der Kühlluftstrom LK ergeben dabei einen Mischluftstrom LM, der über den Ausblasbereich A in einen Ausblaskanal 22 gefördert wird. Ein Spalt S zwischen der Trennplatte 2 und einem auf der Isolierung 23 angeordneten Abdeckblech 20 kann dabei großzügig gewählt werden, da der Kragen 16 derart ausgebildet ist, dass er in den Ansaugkanal 21 eintaucht und dadurch das Ansaugen einer Fehlluft über den Spalt S weitgehend verhindert.The representation in Figure 3 shows schematically the radial fan wheel built into a cooking appliance. The radial fan wheel serves to generate a cooling air flow LK, which is used to cool a switch area of the cooking appliance (not shown). In addition, the radial fan wheel, through its additional delivery unit 12, removes vapors from an oven muffle 19 of the cooking appliance, which is surrounded by insulation 23. The extracted vapor is mixed with the cooling air flow LK. During operation, the cooling air flow LK is formed via a suction area AH of the main conveyor unit 8 arranged at the top and is conveyed radially outward into a blow-out area A via the main conveyor unit 8. The circular suction area AH of the main conveyor unit 8 is arranged centrally above the main conveyor unit 8. The axis 18 forms the center of the suction area AH. Via a suction channel 21, opposite to the suction area AH of the main delivery unit 8, a vapor air flow LW is additionally sucked in via a suction area AZ of the additional delivery unit 12. Through the opening 11, the vapor air flow LW is conveyed by means of the air blades 14 of the additional conveyor unit 12 to the main conveyor unit 8 arranged above the partition plate 2. The vapor air flow LW from the suction area AZ of the additional conveyor unit 12 and the cooling air flow LK result in a mixed air flow LM which is conveyed via the blow-out area A into a blow-out duct 22. A gap S between the partition plate 2 and a cover plate 20 arranged on the insulation 23 can be chosen generously, since the collar 16 is designed in such a way that it dips into the intake duct 21 and thereby largely prevents the sucking in of defective air via the gap S.

BezugszeichenlisteList of reference symbols

22
TrennplattePartition plate
44th
AntriebsachsenaufnahmeDrive axle mount
55
AufnahmeöffnungReceiving opening
66th
HaltestegeHolding bars
88th
HauptfördereinheitMain conveyor unit
1010
Luftschaufeln der HauptfördereinheitMain conveyor unit air vanes
1111
Öffnungopening
1212
ZusatzfördereinheitAdditional delivery unit
1414th
Luftschaufeln der ZusatzfördereinheitAir vanes of the auxiliary conveyor unit
1616
Kragencollar
1717th
ZwischenraumSpace
1818th
Achseaxis
1919th
MuffelGrouch
2020th
AbdeckblechCover plate
2121st
AnsaugkanalIntake duct
2222nd
AusblaskanalExhaust duct
2323
Isolierunginsulation
AA.
AusblasbereichDischarge area
AHAH
Ansaugbereich HauptfördereinheitMain delivery unit suction area
AZAZ
Ansaugbereich ZusatzfördereinheitSuction area additional delivery unit
HH
Höheheight
LMLM
MischluftstromMixed air flow
LKLK
KühlluftstromCooling air flow
LWLW
WrasenluftstromVapor air flow
SS.
Spaltgap

Claims (8)

  1. Radial fan for a household appliance, in particular for a cooking appliance, with a main delivery unit (8) and an additional delivery unit (12), which have intake areas (AH, AZ) which are spatially separated from one another by a baffle plate (2) in each case, and in which the main delivery unit (8) is provided to deliver the air taken in from the intake areas (AH, AZ) radially outward, wherein the additional delivery unit (12) has rotor blades (14), characterised in that the additional delivery unit (12) is surrounded by a ring-shaped collar (16) and the collar (16) is arranged on the baffle plate (2), wherein the additional delivery unit (12) is an axial additional delivery unit and the rotor blades (14) of the additional delivery unit (12) are arranged within the collar (16).
  2. Radial fan according to claim 1, characterised in that the rotor blades (14) of the additional delivery unit (12) generate a flow of air (LW) along an axis of rotation (18) of the fan.
  3. Radial fan according to claim 1 or 2, characterised in that the rotor blades (14) of the additional delivery unit (12) are arranged at least partially in an opening (11) in the baffle plate (2).
  4. Radial fan according to one of the preceding claims, characterised in that the additional delivery unit (12) is arranged within an opening (11) bounded by the collar (16).
  5. Radial fan according to one of the preceding claims, characterised in that the collar (16) has a height of 2 to 10 mm, preferably of 3 to 8 mm.
  6. Radial fan according to one of the preceding claims, characterised in that the rotor blades (14) of the additional delivery unit (12) form a mechanical connection between a drive axle receptacle (4) and the baffle plate (2) arranged along a central axis (18).
  7. Household appliance, in particular cooking appliance, with a radial fan according to one of the preceding claims.
  8. Household appliance, in particular cooking appliance, according to claim 7, with a radial fan according to claim 4, characterised in that the collar (16) submerges into an intake duct (21).
EP12166751.3A 2011-05-11 2012-05-04 Radial fan for suction hood Active EP2522858B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102011075628A DE102011075628A1 (en) 2011-05-11 2011-05-11 Radial fan and home appliance with a radial fan

Publications (3)

Publication Number Publication Date
EP2522858A2 EP2522858A2 (en) 2012-11-14
EP2522858A3 EP2522858A3 (en) 2017-07-19
EP2522858B1 true EP2522858B1 (en) 2020-10-21

Family

ID=46177230

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12166751.3A Active EP2522858B1 (en) 2011-05-11 2012-05-04 Radial fan for suction hood

Country Status (2)

Country Link
EP (1) EP2522858B1 (en)
DE (1) DE102011075628A1 (en)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1805121A1 (en) * 1968-10-25 1970-05-21 Siemens Ag Two-stage fan
JPS5136111U (en) * 1974-09-11 1976-03-17
DE10152733A1 (en) 2001-10-25 2003-05-08 Bsh Bosch Siemens Hausgeraete Cooking appliance with a blower unit
US8821227B2 (en) * 2009-10-07 2014-09-02 Sunonwealth Electric Machine Industry Co., Ltd. Heat dissipating system

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
EP2522858A3 (en) 2017-07-19
DE102011075628A1 (en) 2012-11-15
EP2522858A2 (en) 2012-11-14

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