EP2372163B1 - Fan - Google Patents

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Publication number
EP2372163B1
EP2372163B1 EP10003653.2A EP10003653A EP2372163B1 EP 2372163 B1 EP2372163 B1 EP 2372163B1 EP 10003653 A EP10003653 A EP 10003653A EP 2372163 B1 EP2372163 B1 EP 2372163B1
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EP
European Patent Office
Prior art keywords
fan impeller
fan
further characterized
base plate
reinforcing profiles
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.)
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Application number
EP10003653.2A
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German (de)
French (fr)
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EP2372163A1 (en
Inventor
Lutz Riefenstein
Stan Smits
Günther Wurdinger
Thomas Lang
Rainer Lammerskitten
Andreas Berchtenbreiter
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.)
Welbilt Deutschland GmbH
Original Assignee
Convotherm Elektrogeraete GmbH
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Application filed by Convotherm Elektrogeraete GmbH filed Critical Convotherm Elektrogeraete GmbH
Priority to EP10003653.2A priority Critical patent/EP2372163B1/en
Priority to PCT/EP2011/001513 priority patent/WO2011120659A1/en
Publication of EP2372163A1 publication Critical patent/EP2372163A1/en
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/26Rotors specially for elastic fluids
    • F04D29/28Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/289Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps having provision against erosion or for dust-separation
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/26Rotors specially for elastic fluids
    • F04D29/28Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/281Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers

Definitions

  • the invention relates to a fan according to the preamble of claim 1, which is particularly suitable for a commercial cooking appliance, such as a combi steamer.
  • Such a fan is from the EP 1 530 682 B1 or the priority application for this EP application DE 102 39 246 known.
  • the known fan wheel has fan blades, on the outer surface of which at least one elevation is arranged and / or formed which is spaced from a base plate of the fan wheel and extends away from the base plate, substantially diagonally from a leading edge to a trailing edge of the fan blades.
  • the DE 102 34 214 B4 teaches a cooking appliance with integrated grease separation, including a disc between a rear wall of the cooking chamber and the fan wheel is arranged, which is designed such that the arranged around the fan around heater is covered by the disc substantially completely opposite the rear wall.
  • a fan for a circulating radial fan of a cooking chamber which is provided with at least between some of its blades spaced from a support plate baffles, wherein the baffles with the support disk and the respective adjacent, radially arranged, straight blades a nozzle device for Generating a radially outwardly directed gas flow near the support disk.
  • a device for cooking chamber air conditioning in the form of a fan wheel which has a plurality of blade units, wherein each blade unit consists of at least two blades, which are referred to as a basic blade and cover blade and have a planar and / or spatially curved surface.
  • the primary bucket has at least one collecting profile which has a concave surface for collecting particulate matter in the centrifugal direction.
  • the cover blade can be positioned up to the base blade against the direction of rotation of the fan at a given distance.
  • Another fan which comprises a cover plate and a base plate, between which fan blades extend.
  • the fan blades are attached to the top plate via the plates.
  • the discharge device can fulfill both its basic function according to which it reliably removes impurities in the air conveyed to the heating device, and at the same time reinforces the entire structure of the fan impeller according to the invention, since it is designed as a reinforcing profile.
  • the discharge device or each of the fan blades associated reinforcement profile holds a radial distance to the outer edge of the fan blades, which also the advantageous effect that the reinforcing profiles of the discharge device can be formed as an air guide device, which derives the flow of air flowing from the fan blades and thus at least reduced turbulence of the exhaust air, so that the total air resistance is reduced.
  • This in turn has the advantageous effect that the drive power of the motor of the fan wheel can be reduced without reducing the performance of the fan wheel, which ultimately leads to significant energy savings.
  • the reinforcement profiles can also be used as retrofit parts for existing fan wheels, since the fan blades themselves do not need to be modified because the reinforcement profiles represent an independent part for the fan blades, which can also be subsequently integrated into existing fan wheel designs.
  • these are preferably arranged inclined at an angle to the fan longitudinal axis.
  • the inclination in the direction of the center and the base plate of the impeller that is, inside, made, in a further preferred embodiment, the outer edge of the fan blades parallel to the reinforcing profile, that is inclined at the same angle to the fan longitudinal axis, as the reinforcing profiles.
  • the reinforcing profiles can in principle accommodate different designs, in each case forming a channel whose length is determined by the distance between the base plate and the cover plate, since this channel extends from the base plate to the cover plate.
  • the reinforcing profiles are preferably designed to be favorable in terms of flow and may, in particular, have a teardrop shape or else a shape similar to an aircraft wing. Since all reinforcing profile embodiments are channel-shaped, all have one suitable opening for receiving the impurities flowing from the fan blades.
  • the discharge device is not formed or arranged on the fan blades, can be seen in the fact that they can be straight and preferably flat or can maintain their straight and preferably planar design and thus the Fan wheel reversible, that is operable in both directions of rotation, which is not possible in particular in the ventilation wheel according to the generic state of the art. Because there, as explained above, the discharge device is formed only on one of the two Lüfterradschaufel vom.
  • Fig. 1 From a synopsis of Fig. 1 to 3 initially results in the basic structure of a fan impeller 1 according to the invention for a commercial cooking appliance, in particular a combi steamer, which is not shown in the drawings.
  • the fan 1 has a plurality of fan blades, of which in the Fig. 2 adjacent fan blades with the reference numerals 2 and 3 representative of the other fan blades are identified.
  • the Lüfterradschaufeln 2, 3 are arranged radially around a Lüfterradstoffddling M on a base plate 4 on which they, for example by means of in Fig. 3 visible tabs 19 can be attached.
  • the fan 1 has twelve such fan blades, as is the case Fig. 1 results.
  • Fig. 2 shows that the Lüfterradschaufeln 2, 3 between the base plate 4 and a cover plate or a cover ring 5 are arranged.
  • Each of the fan blades 2, 3 has a first blade surface 6 and a second blade surface 7, which, for example, from the Fig. 1 and 3 results in pointing in opposite directions.
  • the air to be guided from the fan wheel 1 to a heating device impinges on these blade surfaces 6, 7.
  • the Lüfterradschaufeln 2, 3, as can be seen from the figures, are straight and preferably flat and at least substantially at right angles to the base plate 4 and the cover plate 5 are arranged.
  • the Lüfterradschaufeln 2, 3 further comprises an outer edge 8 and an inner edge 9. From the fan center M in the radial direction R (see Fig. 1 ), in this case has the outer edge 8 radially outward, while the inner edge 9 has radially inwardly to the center M.
  • the impeller 1 according to the invention is further provided with a discharge device 10, which serves to deposit impurities contained in the air conveyed by the impeller 1 or its impeller blades 2, 3.
  • These impurities are, in particular, fat or oil particles which emerge from the food during the cooking process and mix with the air conveyed by the fan 1. This can be prevented that these grease or oil particles or other contaminants on the surrounding the fan 1 not shown heater be thrown, said discharge device 10 is provided, which has a plurality of reinforcing profiles 10A, 10B, 10C in the illustrated example case.
  • Each of the fan blades 2, 3 provided is assigned a reinforcing profile 10A, 10B, 10C, so that in the exemplary case of twelve fan blades, twelve such reinforcing profiles are accordingly provided.
  • Fig. 1 shows three different training options for such reinforcing profiles, which are denoted by the backgroundssziffem 10A, 10B and 10C. It should be emphasized that Fig. 1 merely by way of example these three different gain profiles for ease of illustration on a fan 1 shows. In the actual embodiment of the impeller 1 per fan blade 2, 3 only one type of reinforcing profile, ie either the reinforcing profile 10A provided for all fan blades or the reinforcing profile 10B for all fan blades or the reinforcing profile 10C for all fan blades.
  • the reinforcing profile 10A is designed like an arrowhead in plan view.
  • the reinforcing profile 10B is a preferred embodiment in that it has a streamlined design in that the free end regions 12, 13 (see FIG Fig. 1 ) compared to the illustrated embodiment to improve the flow efficiency can still be formed bent towards each other.
  • the embodiment 10B represents, as it were, a representative of aerodynamic profiles, such as drop-shaped or wing-like profiles.
  • the reinforcing profile 10C is U-shaped.
  • All reinforcing profiles form channels, which, like Fig. 2 illustrated, extend from the base plate 4 to the cover plate 5.
  • the respectively supported on the base plate 4 end portion 18 of the reinforcing profiles 10A, 10B and 10C corresponds to recesses 14, 15, 16 and 17, which also exemplifies in Fig. 1 are clarified.
  • These recesses 14 to 17 represent the derivation of the particles collected in the respective reinforcing profile 10A, 10B, 10C, in particular the oil particles, it being ensured by the arrangement of the reinforcing profiles radially outside the outer edge 8 of the fan blades 2, 3 that the collected and derived particles can not impinge on the heater surrounding the fan.
  • the 3 and 4 illustrate here that between the outer edge 8 of each of the fan blades and the associated reinforcing profile, a radial distance A is maintained, which may be different depending on the application, but has a value greater than 0.
  • each of the reinforcing profiles 10A, 10B and 10C, respectively, is inclined at an angle ⁇ to the fan longitudinal center line L, which in FIG Fig. 3 symbolized by the cross L.
  • this longitudinal center line L is moved parallel to the outer region of the fan wheel 1 in order to better illustrate the inclination angle ⁇ .

Description

Die Erfindung betrifft ein Lüfterrad gemäß dem Oberbegriff des Anspruches 1, das insbesondere für ein gewerbliches Gargerät, wie einen Heißluftdämpfer, geeignet ist.The invention relates to a fan according to the preamble of claim 1, which is particularly suitable for a commercial cooking appliance, such as a combi steamer.

Ein derartiges Lüfterrad ist aus der EP 1 530 682 B1 bzw. der die Prioritätsanmeldung zu dieser EP-Anmeldung darstellenden DE 102 39 246 bekannt.Such a fan is from the EP 1 530 682 B1 or the priority application for this EP application DE 102 39 246 known.

Das bekannte Lüfterrad weist Lüfterradschaufeln auf, auf deren Außenfläche zumindest eine Erhöhung angeordnet und/oder ausgebildet ist, die von einer Grundplatte des Lüfterrades beabstandet ausgebildet ist und sich von der Grundplatte weg, im Wesentlichen diagonal von einer Vorderkante zu einer Hinterkante der Lüfterradschaufeln erstreckt.The known fan wheel has fan blades, on the outer surface of which at least one elevation is arranged and / or formed which is spaced from a base plate of the fan wheel and extends away from the base plate, substantially diagonally from a leading edge to a trailing edge of the fan blades.

Hierdurch soll es möglich sein, dass in der vom Lüfterrad umgewälzten Luft enthaltene Feststoff- und/oder Flüssigkeitspartikel, insbesondere Fettpartikel, nicht unmittelbar radial durch das Lüfterrad umgelenkt werden. Denn die Erhöhung auf den Außenflächen der Lüfterradschaufeln stoppen die auf sie auftreffenden Feststoff-und/oder Flüssigkeitspartikel, so dass es möglich sein soll, dass unmittelbar radial um das Lüfterrad angeordnete Vorrichtungen, wie insbesondere eine Heizeinrichtung innerhalb eines Gargerätes, nicht von den in der Luft enthaltenen Partikeln verschmutzt werden.This should make it possible that contained in the air circulated by the fan air contained solids and / or liquid particles, in particular fat particles are not deflected directly radially by the fan. Because the increase on the outer surfaces of the Lüfterradschaufeln stop the impinging solid and / or liquid particles, so that it should be possible that immediately radially arranged around the fan devices, such as in particular a heater within a cooking appliance, not from those in the air Contaminated particles are contaminated.

Diese Ausführungsform ist technisch jedoch insofern problematisch, als sie eine Modifizierung der Lüfterradschaufeln durch das Anbringen der genannten Erhöhungen auf der Außenfläche erfordern. Da die Lüfterradschaufeln nur auf der Außenfläche angebracht sind, kann das gattungsgemäße Lüfterrad darüber hinaus mit derselben Wirkung nur in einer Drehrichtung betrieben werden.However, this embodiment is technically problematic in that it requires modification of the fan blades by the attachment of said protrusions on the outer surface. Since the fan blades are mounted only on the outer surface, the generic fan can be operated beyond the same effect only in one direction.

Aus der DE 103 15 341 ist ein Gargerät bekannt, dass ein Radialgebläserad aufweist, auf dessen Schaufeln jeweils ein rotierendes Abscheideelement zum Abscheiden von Partikel aus der Atmosphäre im Garraum vorgesehen ist. Somit ergeben sich ähnliche Probleme, wie beim gattungsgemäßen Stand der Technik.From the DE 103 15 341 a cooking appliance is known that has a radial impeller, on the blades of each of which a rotating separating element is provided for separating particles from the atmosphere in the cooking chamber. Thus, similar problems arise as in the generic state of the art.

Die DE 102 34 214 B4 lehrt ein Gargerät mit integrierter Fettabscheidung, wozu eine Scheibe zwischen einer Rückwand des Garraums und dem Lüfterrad angeordnet ist, die derart ausgebildet ist, dass die um das Lüfterrad herum angeordnete Heizeinrichtung durch die Scheibe im Wesentlichen vollständig gegenüber der Rückwand abgedeckt ist.The DE 102 34 214 B4 teaches a cooking appliance with integrated grease separation, including a disc between a rear wall of the cooking chamber and the fan wheel is arranged, which is designed such that the arranged around the fan around heater is covered by the disc substantially completely opposite the rear wall.

Aus der EP 0 615 069 B1 ist schließlich ein Lüfterrad für ein Umwälz-Radialgebläse eines Garraums bekannt, das mit mindestens zwischen einigen seiner Schaufeln mit Abstand von einer Stützscheibe angeordneten Leitblechen versehen ist, wobei die Leitbleche mit der Stützscheibe und den jeweils benachbarten, radial angeordneten, gerade verlaufenden Schaufeln eine Düseneinrichtung zum Erzeugen einer radial nach außen gerichteten Gasströmung nahe der Stützscheibe bilden.From the EP 0 615 069 B1 Finally, a fan for a circulating radial fan of a cooking chamber is known, which is provided with at least between some of its blades spaced from a support plate baffles, wherein the baffles with the support disk and the respective adjacent, radially arranged, straight blades a nozzle device for Generating a radially outwardly directed gas flow near the support disk.

Aus der DE 10 2005 047 457 A1 ist eine Vorrichtung zur Garraum-Klimareinigung in Form eines Lüfterrades bekannt, das mehrere Schaufeleinheiten aufweist, wobei jede Schaufeleinheit aus mindestens zwei Schaufeln besteht, die als Grundschaufel und Deckschaufel bezeichnet werden und die eine planare und/oder räumlich gekrümmte Fläche haben. Die Grundschaufel hat mindestens ein Sammelprofil, das zum Einsammeln von Stoffpartikeln in der Zentrifugalrichtung eine konkave Fläche aufweist. Die Deckschaufel kann bis zu der Grundschaufel entgegen der Drehrichtung des Lüfterrades in einem gegebenen Abstand positioniert sein.From the DE 10 2005 047 457 A1 a device for cooking chamber air conditioning in the form of a fan wheel is known which has a plurality of blade units, wherein each blade unit consists of at least two blades, which are referred to as a basic blade and cover blade and have a planar and / or spatially curved surface. The primary bucket has at least one collecting profile which has a concave surface for collecting particulate matter in the centrifugal direction. The cover blade can be positioned up to the base blade against the direction of rotation of the fan at a given distance.

Aus der FR 1 058 690 A ist ein weiteres Lüfterrad bekannt, das eine Deckplatte und eine Grundplatte aufweist, zwischen denen sich Lüfterradschaufeln erstrecken. Bei der Ausführungsform gemäß den Fig. 4 und 5 sind die Lüfterradschaufeln über Platten an der Deckplatte bzw. der Grundplatte befestigt.From the FR 1 058 690 A Another fan is known which comprises a cover plate and a base plate, between which fan blades extend. In the embodiment according to the Fig. 4 and 5, the fan blades are attached to the top plate via the plates.

Schließlich ist aus dem DokumentFinally, from the document

http://www.airfanteknik.com/documents/Fan%20Terminology.pdf
eine Zusammenstellung der Terminologie bekannt, die im Bereich der Lüfterradtechnologie Verwendung findet. Im Abs. "Fan Parts" ist hierzu erläutert, dass es grundsätzlich denkbar ist, Abdeckbleche zu verwenden, an denen die Lüfterradschaufeln befestigt werden können.
http://www.airfanteknik.com/documents/Fan%20Terminology.pdf
a compilation of the terminology is known, which is used in the field of fan technology. It is explained in the paragraph "Fan Parts" that it is generally conceivable to use cover plates on which the fan blades can be attached.

Es ist daher Aufgabe der vorliegenden Erfindung, ein Lüfterrad der im Oberbegriff des Anspruches 1 angegebenen Art zu schaffen, dessen Aufbau gegenüber dem gattungsgemäßen Lüfterrad vereinfacht ist und dennoch eine sichere Ableitung von Verunreinigungen zur Vermeidung des Auftreffens auf die Heizeinrichtung eines gewerblichen Gargeräts ermöglicht.It is therefore an object of the present invention to provide a fan of the type specified in the preamble of claim 1, whose construction is simplified compared to the generic fan and still allows safe discharge of impurities to avoid impinging on the heater of a commercial cooking appliance.

Die Lösung dieser Aufgabe erfolgt durch die Merkmale des Anspruches 1.The solution of this object is achieved by the features of claim 1.

Durch die erfindungsgemäße Ausbildung wird zunächst erreicht, dass die Ableitvorrichtung sowohl ihre Basisfunktion erfüllen kann, gemäß der sie Verunreinigungen in der zur Heizeinrichtung geförderten Luft sicher abführt, als auch gleichzeitig den gesamten Aufbau des erfindungsgemäßen Lüfterrades verstärkt, da sie als Verstärkungsprofil ausgebildet ist.As a result of the construction according to the invention, it is initially achieved that the discharge device can fulfill both its basic function according to which it reliably removes impurities in the air conveyed to the heating device, and at the same time reinforces the entire structure of the fan impeller according to the invention, since it is designed as a reinforcing profile.

Ferner wird durch die erfindungsgemäße Ausbildung des Lüfterrades vermieden, dass Änderungen an den Lüfterradschaufeln vorgenommen werden müssen, da die Ableitvorrichtung, nicht wie beim gattungsgemäßen Stand der Technik, auf einer der Flächen der Lüfterradschaufeln, sondern getrennt von den Lüfterradschaufeln zwischen der Grundplatte und der Deckplatte vorgesehen ist. Hierfür hält die Ableitvorrichtung bzw. jedes der den Lüfterradschaufeln zugeordnete Verstärkungsprofil einen Radialabstand zur Außenkante der Lüfterradschaufeln ein, was darüber hinaus den vorteilhaften Effekt hat, dass die Verstärkungsprofile der Ableitvorrichtung als Luftführungseinrichtung ausgebildet werden können, die die von den Lüfterradschaufeln abströmende Luft strömungsgünstig ableitet und damit Verwirbelungen der Abströmluft zumindestens vermindert, so dass insgesamt der Luftwiderstand verringert wird. Dies hat wiederum den vorteilhaften Effekt, dass die Antriebsleistung des Motors des Lüfterrades herabgesetzt werden kann, ohne die Leistung des Lüfterrades zu vermindern, was letztendlich zu erheblichen Energieeinsparungen führt.Furthermore, it is avoided by the inventive design of the fan wheel that changes to the fan blades must be made because the diverter, not as in the generic state of the art, provided on one of the surfaces of the fan blades, but separated from the fan blades between the base plate and the cover plate is. For this purpose, the discharge device or each of the fan blades associated reinforcement profile holds a radial distance to the outer edge of the fan blades, which also the advantageous effect that the reinforcing profiles of the discharge device can be formed as an air guide device, which derives the flow of air flowing from the fan blades and thus at least reduced turbulence of the exhaust air, so that the total air resistance is reduced. This in turn has the advantageous effect that the drive power of the motor of the fan wheel can be reduced without reducing the performance of the fan wheel, which ultimately leads to significant energy savings.

Des Weiteren ergibt sich der Vorteil, dass die Verstärkungsprofile auch als Nachrüstteile für bestehende Lüfterräder verwendet werden können, da die Lüfterradschaufeln selber nicht modifiziert werden müssen, weil die Verstärkungsprofile ein für die Lüfterradschaufeln unabhängiges Zusatzteil darstellen, das auch in bestehende Lüfterradkonstruktionen nachträglich integriert werden kann.Furthermore, there is the advantage that the reinforcement profiles can also be used as retrofit parts for existing fan wheels, since the fan blades themselves do not need to be modified because the reinforcement profiles represent an independent part for the fan blades, which can also be subsequently integrated into existing fan wheel designs.

Die Unteransprüche haben vorteilhafte Weiterbildungen der Erfindung zum Inhalt.The dependent claims have advantageous developments of the invention to the content.

Um die Ableitfunktion der Verstärkungsprofile noch zu verbessern, sind diese vorzugsweise in einem Winkel zur Lüfterradlängsmittelachse geneigt angeordnet. Insbesondere ist die Neigung in Richtung des Mittelpunktes und der Grundplatte des Lüfterrades, also nach Innen, vorgenommen, wobei bei einer weiteren bevorzugten Ausführungsform die Außenkante der Lüfterradschaufeln parallel zum Verstärkungsprofil verläuft, also in demselben Winkel zur Lüfterradlängsachse geneigt ist, wie die Verstärkungsprofile.In order to improve the dissipation function of the reinforcing profiles, these are preferably arranged inclined at an angle to the fan longitudinal axis. In particular, the inclination in the direction of the center and the base plate of the impeller, that is, inside, made, in a further preferred embodiment, the outer edge of the fan blades parallel to the reinforcing profile, that is inclined at the same angle to the fan longitudinal axis, as the reinforcing profiles.

Die Verstärkungsprofile können vom Prinzip her unterschiedliche Gestaltungen aufnehmen, wobei sie in jedem Falle eine Rinne bilden, deren Länge vom Abstand zwischen der Grundplatte und der Deckplatte bestimmt wird, da sich diese Rinne von der Grundplatte bis zur Deckplatte erstreckt.The reinforcing profiles can in principle accommodate different designs, in each case forming a channel whose length is determined by the distance between the base plate and the cover plate, since this channel extends from the base plate to the cover plate.

Wie zuvor bereits erläutert, sind die Verstärkungsprofile vorzugsweise strömungsgünstig ausgebildet und können insbesondere eine Tropfenform oder auch eine einer Flugzeugtragfläche ähnliche Form aufweisen. Da alle Verstärkungsprofilausführungsformen rinnenförmig ausgebildet sind, haben alle eine geeignete Öffnung zur Aufnahme der von den Lüfterradschaufeln abströmenden Verunreinigungen.As already explained above, the reinforcing profiles are preferably designed to be favorable in terms of flow and may, in particular, have a teardrop shape or else a shape similar to an aircraft wing. Since all reinforcing profile embodiments are channel-shaped, all have one suitable opening for receiving the impurities flowing from the fan blades.

Ein weiterer Vorteil, der sich aus dem Umstand ergibt, dass die Ableitvorrichtung nicht auf den Lüfterradschaufeln ausgebildet oder angeordnet ist, ist darin zu sehen, dass diese gerade und vorzugsweise eben ausgebildet werden können bzw. ihre gerade und vorzugsweise ebene Ausbildung beibehalten können und somit das Lüfterrad reversibel, also in beiden Drehrichtungen betreibbar ist, was insbesondere beim Lüftungsrad gemäß dem gattungsgemäßen Stand der Technik nicht möglich ist. Denn dort ist, wie eingangs erläutert, die Ableitvorrichtung nur auf einer der beiden Lüfterradschaufelflächen ausgebildet.Another advantage, which results from the fact that the discharge device is not formed or arranged on the fan blades, can be seen in the fact that they can be straight and preferably flat or can maintain their straight and preferably planar design and thus the Fan wheel reversible, that is operable in both directions of rotation, which is not possible in particular in the ventilation wheel according to the generic state of the art. Because there, as explained above, the discharge device is formed only on one of the two Lüfterradschaufelflächen.

Weitere Einzelheiten, Vorteile und Merkmale der vorliegenden Erfindung ergeben sich aus nachfolgender Beschreibung von Ausführungsbeispielen anhand der Zeichnung. Es zeigt:

Fig. 1
eine geschnittene Draufsicht auf eine Ausführungsform des erfindungsgemäßen Lüfterrades zur Verdeutlichung unterschiedlicher Ausführungsvarianten von Verstärkungsprofilen, wobei aufgrund der Lage des Schnittes eine Deckplatte des Lüfterrades nicht sichtbar ist;
Fig. 2
eine perspektivische Teilansicht des Lüfterrades gemäß Fig. 1;
Fig. 3
eine Draufsicht auf einen Teil des erfindungsgemäßen Lüfterrades gemäß Fig. 1 und 2;
Fig. 4
eine Einzelheit des erfindungsgemäßen Lüfterrades im Bereich einer Außenkante einer Lüfterradschaufel.
Further details, advantages and features of the present invention will become apparent from the following description of exemplary embodiments with reference to the drawing. It shows:
Fig. 1
a sectional plan view of an embodiment of the fan impeller according to the invention to illustrate different embodiments of reinforcement profiles, wherein due to the position of the cut, a cover plate of the fan wheel is not visible;
Fig. 2
a partial perspective view of the fan according to Fig. 1 ;
Fig. 3
a plan view of a part of the fan according to the invention according to Fig. 1 and 2 ;
Fig. 4
a detail of the fan wheel according to the invention in the region of an outer edge of a fan blade.

Aus einer Zusammenschau der Fig. 1 bis 3 ergibt sich zunächst der grundsätzliche Aufbau eines erfindungsgemäßen Lüfterrades 1 für ein gewerbliches Gargerät, insbesondere einen Heißluftdämpfer, der in den Zeichnungen jedoch nicht dargestellt ist. Das Lüfterrad 1 weist eine Mehrzahl von Lüfterradschaufeln auf, von denen in den Fig. 2 benachbarte Lüfterradschaufeln mit den Bezugsziffern 2 und 3 repräsentativ für die anderen Lüfterradschaufeln identifiziert sind. Wie sich aus Fig. 1 ergibt, sind die Lüfterradschaufeln 2, 3 radial um einen Lüfterradmittelpunkt M auf einer Grundplatte 4 angeordnet, auf der sie beispielsweise mittels in Fig. 3 sichtbaren Laschen 19 befestigt werden können. Im Beispielsfalle weist das Lüfterrad 1 zwölf derartige Lüfterradschaufeln auf, wie sich dies aus Fig. 1 ergibt.From a synopsis of Fig. 1 to 3 initially results in the basic structure of a fan impeller 1 according to the invention for a commercial cooking appliance, in particular a combi steamer, which is not shown in the drawings. The fan 1 has a plurality of fan blades, of which in the Fig. 2 adjacent fan blades with the reference numerals 2 and 3 representative of the other fan blades are identified. As it turned out Fig. 1 results, the Lüfterradschaufeln 2, 3 are arranged radially around a Lüfterradmittelpunkt M on a base plate 4 on which they, for example by means of in Fig. 3 visible tabs 19 can be attached. In the example case, the fan 1 has twelve such fan blades, as is the case Fig. 1 results.

Aus der Darstellung der Fig. 2 ergibt sich, dass die Lüfterradschaufeln 2, 3 zwischen der Grundplatte 4 und einer Deckplatte bzw. einem Deckring 5 angeordnet sind.From the representation of Fig. 2 shows that the Lüfterradschaufeln 2, 3 between the base plate 4 and a cover plate or a cover ring 5 are arranged.

Jede der Lüfterradschaufeln 2, 3 weist eine erste Schaufelfläche 6 und eine zweite Schaufelfläche 7 auf, die, wie sich beispielsweise aus den Fig. 1 und 3 ergibt, in entgegengesetzte Richtungen weisen. Auf diese Schaufelflächen 6, 7 trifft beim Betrieb des Lüfterrades 1 die vom Lüfterrad 1 auf eine Heizeinrichtung zu leitende Luft auf. Hierbei ist hervorzuheben, dass die Lüfterradschaufeln 2, 3, wie sich dies aus den Figuren ergibt, gerade und vorzugsweise eben ausgebildet sind und zumindest im Wesentlichen im rechten Winkel zur Grundplatte 4 und zur Deckplatte 5 angeordnet sind. Aufgrund der geraden und vorzugsweise ebenen Ausbildung der Lüfterradschaufeln 2, 3 ist es möglich, das Lüfterrad 1 reversibel, also in entgegengesetzte Drehrichtungen zu betreiben, so dass je nach Drehrichtung die Luft entweder auf die erste oder die zweite Schaufelfläche 6 bzw. 7 auftrifft, und die Luftförderleistung gleich bleibt.Each of the fan blades 2, 3 has a first blade surface 6 and a second blade surface 7, which, for example, from the Fig. 1 and 3 results in pointing in opposite directions. During operation of the fan wheel 1, the air to be guided from the fan wheel 1 to a heating device impinges on these blade surfaces 6, 7. It should be emphasized that the Lüfterradschaufeln 2, 3, as can be seen from the figures, are straight and preferably flat and at least substantially at right angles to the base plate 4 and the cover plate 5 are arranged. Due to the straight and preferably planar design of the fan blades 2, 3, it is possible to operate the fan 1 reversible, ie in opposite directions, so that depending on the direction of rotation, the air impinges on either the first or the second blade surface 6 and 7, and the air flow remains the same.

Wie vor allem die Fig. 1 und 3 zeigen, weisen die Lüfterradschaufeln 2, 3 ferner eine Außenkante 8 und eine Innenkante 9 auf. Vom Lüfterradmittelpunkt M in Radialrichtung R (siehe Fig. 1) gesehen, weist hierbei die Außenkante 8 radial nach außen, während die Innenkante 9 radial nach innen zum Mittelpunkt M weist.As especially the Fig. 1 and 3 show, the Lüfterradschaufeln 2, 3 further comprises an outer edge 8 and an inner edge 9. From the fan center M in the radial direction R (see Fig. 1 ), in this case has the outer edge 8 radially outward, while the inner edge 9 has radially inwardly to the center M.

Das erfindungsgemäße Lüfterrad 1 ist ferner mit einer Ableitvorrichtung 10 versehen, die dazu dient, in der vom Lüfterrad 1 bzw. dessen Lüfterradschaufeln 2, 3 geförderten Luft enthaltene Verunreinigungen abzuscheiden. Bei diesen Verunreinigungen handelt es sich insbesondere um Fett- oder Ölpartikel, die während des Garvorganges aus dem Gargut austreten und sich mit der vom Lüfterrad 1 geförderten Luft mischen. Damit verhindert werden kann, dass diese Fett- oder Ölpartikel oder sonstigen Verunreinigungen auf die das Lüfterrad 1 umgebende nicht dargestellte Heizeinrichtung geschleudert werden, ist die besagte Ableitvorrichtung 10 vorgesehen, die im dargestellten Beispielsfall eine Mehrzahl von Verstärkungsprofilen 10A, 10B, 10C aufweist. Jeder der vorgesehenen Lüfterradschaufeln 2, 3 ist ein Verstärkungsprofil 10A, 10B, 10C zugeordnet, so dass im Beispielsfalle von zwölf Lüfterradschaufeln dementsprechend zwölf derartige Verstärkungsprofile vorgesehen sind.The impeller 1 according to the invention is further provided with a discharge device 10, which serves to deposit impurities contained in the air conveyed by the impeller 1 or its impeller blades 2, 3. These impurities are, in particular, fat or oil particles which emerge from the food during the cooking process and mix with the air conveyed by the fan 1. This can be prevented that these grease or oil particles or other contaminants on the surrounding the fan 1 not shown heater be thrown, said discharge device 10 is provided, which has a plurality of reinforcing profiles 10A, 10B, 10C in the illustrated example case. Each of the fan blades 2, 3 provided is assigned a reinforcing profile 10A, 10B, 10C, so that in the exemplary case of twelve fan blades, twelve such reinforcing profiles are accordingly provided.

Fig. 1 zeigt drei verschiedene Ausbildungsmöglichkeiten für derartige Verstärkungsprofile, die mit den Bezugsziffem 10A, 10B bzw. 10C gekennzeichnet sind. Hierbei ist zu betonen, dass Fig. 1 lediglich beispielhaft diese drei verschiedenen Verstärkungsprofile zur Vereinfachung der Darstellung an einem Lüfterrad 1 zeigt. Bei der tatsächlichen Ausführung des Lüfterrades 1 ist pro Lüfterradschaufel 2, 3 jeweils nur eine einzige Art von Verstärkungsprofil, also entweder das Verstärkungsprofil 10A bei allen Lüfterradschaufeln oder das Verstärkungsprofil 10B bei allen Lüfterradschaufeln bzw. das Verstärkungsprofil 10C bei allen Lüfterradschaufeln vorgesehen. Fig. 1 shows three different training options for such reinforcing profiles, which are denoted by the Bezugsziffem 10A, 10B and 10C. It should be emphasized that Fig. 1 merely by way of example these three different gain profiles for ease of illustration on a fan 1 shows. In the actual embodiment of the impeller 1 per fan blade 2, 3 only one type of reinforcing profile, ie either the reinforcing profile 10A provided for all fan blades or the reinforcing profile 10B for all fan blades or the reinforcing profile 10C for all fan blades.

Das Verstärkungsprofil 10A ist hierbei in Draufsicht gesehen pfeilspitzenartig ausgebildet. Das Verstärkungsprofil 10B ist insofern eine bevorzugte Ausführungsform, als es eine strömungsgünstige Ausbildung aufweist, wobei die freien Endbereiche 12, 13 (siehe Fig. 1) gegenüber der dargestellten Ausführungsform zur Verbesserung der Strömungsgünstigkeit noch aufeinander zugebogen ausgebildet sein können. Die Ausführungsform 10B stellt sozusagen einen Repräsentanten für strömungsgünstige Profile, wie beispielsweise Tropfenform oder auch tragflächenähnliche Profile dar.In this case, the reinforcing profile 10A is designed like an arrowhead in plan view. The reinforcing profile 10B is a preferred embodiment in that it has a streamlined design in that the free end regions 12, 13 (see FIG Fig. 1 ) compared to the illustrated embodiment to improve the flow efficiency can still be formed bent towards each other. The embodiment 10B represents, as it were, a representative of aerodynamic profiles, such as drop-shaped or wing-like profiles.

Das Verstärkungsprofil 10C ist U-förmig ausgebildet.The reinforcing profile 10C is U-shaped.

Alle Verstärkungsprofile bilden Rinnen, die sich, wie Fig. 2 verdeutlicht, von der Grundplatte 4 bis zur Deckplatte 5 erstrecken. Der sich jeweils auf der Grundplatte 4 abstützende Endbereich 18 der Verstärkungsprofile 10A, 10B bzw. 10C korrespondiert mit Ausnehmungen 14, 15, 16 bzw. 17, die ebenfalls beispielhaft in Fig. 1 verdeutlicht sind. Diese Ausnehmungen 14 bis 17 stellen die Ableitung der in dem jeweiligen Verstärkungsprofil 10A, 10B, 10C gesammelten Partikel, insbesondere der Ölpartikel, dar, wobei aufgrund der Anordnung der Verstärkungsprofile radial außerhalb der Außenkante 8 der Lüfterradschaufeln 2, 3 sichergestellt ist, dass die gesammelten und abgeleiteten Partikel nicht auf die Heizeinrichtung, die das Lüfterrad umgibt, auftreffen können.All reinforcing profiles form channels, which, like Fig. 2 illustrated, extend from the base plate 4 to the cover plate 5. The respectively supported on the base plate 4 end portion 18 of the reinforcing profiles 10A, 10B and 10C corresponds to recesses 14, 15, 16 and 17, which also exemplifies in Fig. 1 are clarified. These recesses 14 to 17 represent the derivation of the particles collected in the respective reinforcing profile 10A, 10B, 10C, in particular the oil particles, it being ensured by the arrangement of the reinforcing profiles radially outside the outer edge 8 of the fan blades 2, 3 that the collected and derived particles can not impinge on the heater surrounding the fan.

Die Fig. 3 und 4 verdeutlichen hierbei, dass zwischen der Außenkante 8 jeder der Lüfterradschaufeln und dem zugeordneten Verstärkungsprofil ein Radialabstand A eingehalten ist, der je nach Anwendungsfall verschieden sein kann, jedoch einen Wert von größer 0 aufweist.The 3 and 4 illustrate here that between the outer edge 8 of each of the fan blades and the associated reinforcing profile, a radial distance A is maintained, which may be different depending on the application, but has a value greater than 0.

Ferner ist jedes der Verstärkungsprofile 10A, 10B bzw. 10C um einen Winkel α geneigt zur Lüfterradlängsmittellinie L ausgebildet, die in Fig. 3 durch das Kreuz L symbolisiert ist. In Fig. 4 ist diese Längsmittellinie L in den Außenbereich des Lüfterrades 1 parallel verschoben, um den Neigungswinkel α besser verdeutlichen zu können.Further, each of the reinforcing profiles 10A, 10B and 10C, respectively, is inclined at an angle α to the fan longitudinal center line L, which in FIG Fig. 3 symbolized by the cross L. In Fig. 4 this longitudinal center line L is moved parallel to the outer region of the fan wheel 1 in order to better illustrate the inclination angle α.

Wie sich aus Fig. 4 erschließt, verläuft die Außenkante 8 der Lüfterradschaufeln 2, 3 bevorzugter Weise parallel zum jeweiligen zugeordneten Verstärkungsprofil 10A, 10B bzw. 10C, so dass diese Außenkante 8 um den gleichen Winkel α zur Längsmittellinie L geneigt ist.As it turned out Fig. 4 opens, the outer edge 8 of the Lüfterradschaufeln 2, 3 preferably parallel to the respective associated reinforcing profile 10A, 10B and 10C, so that this outer edge 8 is inclined by the same angle α to the longitudinal center line L.

Wie eingangs bereits erläutert, ergibt sich durch die Ausbildung des erfindungsgemäßen Lüfterrades 1 der Vorteil, dass die Lüfterradschaufeln 2, 3 nicht verändert werden müssen, da die Ableitvorrichtung 10, die von der Mehrzahl der den Lüfterradschaufeln 2, 3 zugeordneten Verstärkungsprofile gebildet wird, nicht auf den Lüfterradschaufeln, sondern auf der Grundplatte 4 angeordnet und auf dieser befestigt sind, so dass die Gestaltung der Lüfterradschaufeln 2, 3 gänzlich unbeeinflusst von der Anordnung der Ableitvorrichtung 10 bleibt.As already explained, resulting from the design of the fan impeller 1 according to the invention the advantage that the fan blades 2, 3 need not be changed, since the discharge device 10, which is formed by the majority of the fan blades 2, 3 associated reinforcement profiles, not on the Lüfterradschaufeln, but are arranged on the base plate 4 and secured thereto, so that the design of the fan blades 2, 3 completely unaffected by the arrangement of the discharge device 10 remains.

Neben der voranstehenden schriftlichen Offenbarung der Erfindung wird hiermit explizit auf deren zeichnerische Darstellung in den Fig. 1 bis 4 Bezug genommen.In addition to the above written disclosure of the invention is hereby explicitly on their graphic representation in the Fig. 1 to 4 Referenced.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Lüfterradfan
2, 32, 3
Lüfterradschaufelnfan blades
44
Grundplattebaseplate
55
Deckplatte/DeckringTop panel / cover ring
6, 76, 7
erste und zweite Schaufelflächenfirst and second blade surfaces
88th
Außenkanteouter edge
99
Innenkanteinner edge
1010
Ableitvorrichtungdiverter
10A,10B,10C10A, 10B, 10C
Verstärkungsprofilereinforcing profiles
1111
Außenkante des VerstärkungsprofilsOutside edge of the reinforcement profile
12, 1312, 13
freie Endbereichefree end areas
14, 15, 16, 1714, 15, 16, 17
Ausnehmungenrecesses
1818
auf der Grundplatte 4 aufsitzender Endbereich der Verstärkungsprofileseated on the base plate 4 end portion of the reinforcing profiles
1919
Lascheflap
MM
LüfterradmittelpunktLüfterradmittelpunkt
LL
LüfterradlängsmittellinieLüfterradlängsmittellinie
AA
Radialabstandradial distance
αα
Neigungswinkeltilt angle

Claims (12)

  1. A fan impeller (1)
    - with a plurality of fan impeller blades (2, 3),
    • which are arranged between a base plate (4) and a cover plate (5) radially around a fan impeller midpoint (M),
    • which have first and second blade faces (6, 7) that point in opposite directions, and
    • which have a radially outward directed outer edge (8) and a radially inward directed inner edge (9), as viewed from the fan impeller midpoint (M) in the radial direction (R), and
    - with a deflecting device (10) for contaminants present in the air conveyed by the fan impeller blades (2, 3), such as, in particular, oil particles,
    - wherein the deflecting device (10) is designed as a reinforcing profile (10A, 10B, 10C), which is associated with each fan impeller blade (2, 3) and is arranged between the base plate (4) and the cover plate (5) so as to maintain a radial distance (A) with respect to the outer edge (8) of the fan impeller blades (2, 3), as viewed from the fan impeller midpoint (M) in the radial direction (R), and
    - wherein the reinforcing profiles (10A, 10B, 10C) are fastened to the base plate (4) and/or the cover plate (5), and
    - wherein the reinforcing profiles (10A, 10B, 10C) are formed as grooves, which extend from the base plate (4) to the cover plate (5).
  2. The fan impeller according to claim 1, further characterized in that the reinforcing profiles (10A, 10B, 10C) are arranged tilted at an angle (α) with respect to the longitudinal midline (L) of the fan impeller.
  3. The fan impeller according to claim 2, further characterized in that the reinforcing profiles (10A, 10B, 10C) are tilted inward in the direction toward the fan impeller midpoint (M) and the base plate (4).
  4. The fan impeller according to claim 2 or 3, further characterized in that the outer edges (8) are tilted at the same angle (α) with respect to the longitudinal midline (L) of the fan impeller.
  5. The fan impeller according to one of claims 1 to 4, further characterized in that the reinforcing profiles (10A, 10B, 10C) are formed with a favorable flow.
  6. The fan impeller according to one of claims 1 to 5, further characterized in that, seen in plan view, the reinforcing profiles (10A) are formed with an arrowhead shape.
  7. The fan impeller according to one of claims 1 to 5, further characterized in that, seen in plan view, the reinforcing profiles (10B) are formed with a droplet shape or shape similar to supporting beams, wherein the free end regions (12, 13) of the droplet-shaped reinforcing profiles (10B) are formed so as to face one another.
  8. The fan impeller according to one of claims 1 to 5, further characterized in that the reinforcing profiles (10C) are formed in a U-shape.
  9. The fan impeller according to one of claims 1 to 8, further characterized in that outlet recesses (14, 15, 16, 17) that correspond to an end region (18) of the reinforcing profiles (10A, 10B, 10C) resting on the base plate (4) are arranged in the base plate (4).
  10. The fan impeller according to one of claims 1 to 9, further characterized in that the fan impeller blades (2, 3) are planar shaped.
  11. The fan impeller according to one of claims 1 to 10, further characterized in that the fan impeller blades (2, 3) are formed in a truncated cone shape.
  12. The fan impeller according to one of claims 1 to 11, further characterized in that the fan impeller blades (2, 3) are fastened onto the base plate (4) via a bracket (19).
EP10003653.2A 2010-04-01 2010-04-01 Fan Active EP2372163B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP10003653.2A EP2372163B1 (en) 2010-04-01 2010-04-01 Fan
PCT/EP2011/001513 WO2011120659A1 (en) 2010-04-01 2011-03-25 Fan wheel with deflecting means for impurities

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP10003653.2A EP2372163B1 (en) 2010-04-01 2010-04-01 Fan

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EP2372163A1 EP2372163A1 (en) 2011-10-05
EP2372163B1 true EP2372163B1 (en) 2014-10-08

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018158226A1 (en) * 2017-03-03 2018-09-07 Convotherm-Elektrogeräte Gmbh Fan wheel
DE102017203539A1 (en) * 2017-03-03 2018-09-06 Convotherm-Elektrogeräte Gmbh fan
DE102017203526A1 (en) 2017-03-03 2018-09-06 Convotherm-Elektrogeräte Gmbh fan
CN111550436B (en) * 2019-02-12 2022-08-12 日本电产株式会社 Impeller and centrifugal fan with same

Citations (1)

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Publication number Priority date Publication date Assignee Title
FR1058690A (en) * 1951-07-21 1954-03-18 Babcock & Wilcox France Wheel for radial blower machine

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Publication number Priority date Publication date Assignee Title
FR1058628A (en) * 1951-07-21 1954-03-17 Babcock & Wilcox France Blowing machine for gaseous fluids loaded with dust
DE4307405C1 (en) 1993-03-09 1994-11-17 Rational Gmbh Fan wheel
DE10234214B4 (en) 2002-07-22 2006-02-23 Markus Salamon A method of providing information on a mobile electronic device
DE10239246C1 (en) 2002-08-22 2003-08-21 Rational Ag Fan wheel for cooking appliance has projection extending diagonally across outer surface of each fan blade for preventing deposition of fat on heating or heat exchange device at rear of fan wheel
DE10315341C5 (en) 2003-04-03 2009-07-30 Mkn Maschinenfabrik Kurt Neubauer Gmbh & Co. Cooking device with a blower with radial impeller and separator
DE102005047457A1 (en) * 2004-10-01 2006-04-13 Wss Gmbh Device, for cleaning cooking area climate, in form of fan in a steam or hot air steam or hot air or microwave device for cooking food on baking tray has fan with several blade units whereby each blade unit comprises of two blades

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1058690A (en) * 1951-07-21 1954-03-18 Babcock & Wilcox France Wheel for radial blower machine

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WO2011120659A1 (en) 2011-10-06

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