EP1530682B1 - Fan impeller with integrated precipitation of fat particles, in particular for a cooking device - Google Patents
Fan impeller with integrated precipitation of fat particles, in particular for a cooking device Download PDFInfo
- Publication number
- EP1530682B1 EP1530682B1 EP03790684A EP03790684A EP1530682B1 EP 1530682 B1 EP1530682 B1 EP 1530682B1 EP 03790684 A EP03790684 A EP 03790684A EP 03790684 A EP03790684 A EP 03790684A EP 1530682 B1 EP1530682 B1 EP 1530682B1
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- EP
- European Patent Office
- Prior art keywords
- fan impeller
- elevation
- fan
- regions
- baseplate
- 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.)
- Expired - Lifetime
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Classifications
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- 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
- F04D29/289—Rotors 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D23/00—Other rotary non-positive-displacement pumps
- F04D23/001—Pumps adapted for conveying materials or for handling specific elastic fluids
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- 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
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- 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 fan with a base plate and a plurality of fan blades mounted on the base plate, wherein the fan blades are arranged substantially perpendicular to the base plate and form a substantially radial arrangement, each fan blade one radially outwardly and substantially perpendicular to the base plate arranged front edge, a radially inside and arranged substantially perpendicular to the base plate trailing edge, arranged on the pressure side of the impeller outer surface and arranged on the suction side of the impeller inner surface.
- Fan wheels are well known in the art and typically serve to circulate air. Fan wheels are known in a variety of forms, for example, fan wheels are known with propeller-like wings or with blade-like wings.
- One problem with fan wheels known in the art is that particulates and / or liquid particles present in the recirculated air may deposit on the blades of the fan wheel, resulting in fouling of the fan wheel. It can also come through the known fan wheels to an undesirable distribution of the solid and / or liquid particles.
- the fan wheel is arranged in a cooking appliance mostly in a separate from the cooking chamber via a baffle fan space, sucks air from the cooking chamber and directs them radially to the surrounding walls, so as an air flow within the cooking appliance, from the cooking chamber in the fan room and back to the cooking chamber, to produce.
- Concentric around the fan around a heater or a heat exchanger is often arranged so that circulating air is also passed to this heater or this heat exchanger to be heated.
- fat particles present within the circulated air can be conducted to, for example, the heating device, where they can be burned, which can lead to a reduction in the quality of the food and to an odor nuisance.
- This problem arises in particular when the air within the cooking appliance is permanently circulated through the fan, in which case the solid and / or liquid particles are constantly held in the gas volume by the circulating air flow.
- DE 42 06 846 C2 discloses a device comprising an impingement surface or a separating ring around the impeller, to which or onto which a gas stream prevailing in the gas volume occurs, with the solid and / or liquid particles at least partially separating off on impact and being able to run to a first discharge region.
- a fan with a number of radially arranged blades, which project substantially in parallel to the axis of rotation of the fan from a facing on a housing wall of the cooking chamber supporting disk or base plate, in which at least between some of the blades near the support disk, but at a distance from this, baffles are arranged, the radially outer outer edge substantially aligned with the outer periphery of the fan, the radially inner inner edges spaced from the axis of rotation of the fan and with the support disk and the respective adjacent two blades each form a nozzle device for generating a radially outwardly directed gas flow near the support disk.
- a fan is known in which on the outer surface of at least a portion of the fan blades at least one elevation is arranged, which extends away from the base plate.
- Object of the present invention is therefore to develop the generic fan to the effect that the disadvantages of the prior art are overcome.
- it is intended to prevent solids and / or liquid particles present in a circulating air in a cooking appliance from passing directly through the fan wheel onto a heating device or heat exchanger surrounding the fan wheel, without the efficiency of the fan wheel being significantly reduced.
- the object of the present invention is achieved in that arranged and / or formed on the outer surface of at least a portion of the fan blades at least one elevation which is formed spaced from the base plate and away from the base plate, substantially diagonally from the leading edge to the trailing edge the fan blades extends.
- the increase in the form of a step is formed on and / or in the outer surface.
- the fan blades are formed curved so that the outer surface between the leading edge and the trailing edge curves radially outward.
- At least one increase, at least in some areas, has a height of approximately 1 to 10 mm, preferably 2 to 4 mm.
- At least one increase at least in regions has a width of 1 to 10 mm, preferably 2 to 4 mm.
- the fan according to the invention is preferably characterized in that the distance of at least one increase to the base plate at least partially, in particular in the region of the leading edge, at least about 5 to 25 mm, preferably 10 to 20 mm.
- a support member such as in the form of a bezel, the Lüfterradschaufeln proposed on the opposite side of the base plate of the fan blades.
- At least one elevation is arc-shaped at least in regions, wherein it preferably bends away from the support member from the respective trailing edge to the respective leading edge.
- At least one increase at an angle of 45 ° to 90 ° abuts the leading edge, preferably at an angle of 70 ° to 90 °.
- At least one increase is formed by at least one wire.
- At least one increase is welded at least partially on the outer surface of the Lüfterradschaufel.
- each fan blade at least in regions a pronounced edge, such as in the form of a channel, is formed on the side lying in the direction of rotation of the fan wheel in the mounting region between the respective elevation and the outer surface.
- At least one increase has a profiled cross-section at least in regions, preferably arched, wherein in particular the focal point of the curvature lies on the side of the elevation facing the trailing edge, and / or at least one groove, preferably on the side facing the trailing edge, having.
- At least one increase on the side facing away from the direction of rotation of the impeller is at least partially sealed with the outer surface, preferably with silicone.
- An inventive fan may be arranged in a cooking appliance.
- the present invention is based on the surprising finding that is avoided by elevations on the outer surfaces of fan blades on a base plate on the one hand that contained in circulating air solids and / or liquid particles, in particular in the form of fat particles are deflected directly radially by the fan , Rather, solid and / or liquid particles that hit the outer surfaces of the Lüfterradschaufeln stopped at the increase and derived by the special geometry of the increase in the direction of the base plate. In the region of the base plate, the solid and / or liquid particles can then be released from the fan blades, without hitting devices that are arranged directly radially around the fan, such as a heater within a cooking appliance.
- the solid and / or liquid particles from the fan blades are not directly on the fan radially surrounding devices, such as a heater dispensed, it prevents in particular fat particles can be burned on the heater, resulting in a reduction in food quality and an odor could lead.
- the fan according to the invention in a surprising manner that the efficiency of the fan is not significantly affected, since no major obstacles in the radial flow of the circulating air are arranged.
- the elevations disposed on the outer sides of the fan blades may provide additional stability of the fan blades themselves.
- FIG. 1 shows a perspective view of a fan according to the invention.
- the figure shows a perspective view of an inventive fan 1, which is installed in a fan room of a cooking appliance partially shown to rotate in the direction of arrow A rotating air in the cooking chamber, which is partially separated from the fan room by a not shown air deflector.
- the fan 1 has a base plate 2, on which a plurality of fan blades 3 are arranged, which are turned to the cooking chamber of the cooking appliance.
- the Lüfterradschaufeln 3 are curved and arranged substantially perpendicular to the base plate 2 to form a substantially radial arrangement on the base plate 2.
- Each fan blade 3 has a trailing edge 5 contacting the air to be circulated first during operation, and an outer surface 6 arranged on the pressure side of the fan wheel 1 during operation.
- an elevation 7 is provided, which extends away from the base plate 2, substantially diagonally from a front edge 4 to the trailing edge 5 of the Lüfterradschaufel 3.
- the elevation 7 is arranged at a distance of 10 to 20 mm from the base plate 2 on the outer surface 6.
- the elevation 7 may extend completely over the entire width of the Lüfterradschaufel 3, or have a distance from the base plate 2 opposite side of the Lüfterradschaufel 3, wherein this distance is preferably 5 to 15 mm.
- a cover ring 8 is provided, which provides additional stabilization of the fan blades 3 within the fan 1.
- the elevation 7 should stand out from the outer surface 6 of the Lüfterradschaufel 3 by 2 to 5 mm and end at the end facing the air flow on the trailing edge 5 of the Lüfterradschaufel 3 with a sharp edge to a gutter for impinging solid and / or liquid particles form, which prevents further flow of the solid and / or liquid particles beyond the elevation 7, but causes a guiding in the direction of the base plate 2.
- a seal may be provided on the side lying in the flow shadow between the outer surface 6 and elevation 7.
- This seal may be made, for example, with silicone, but any other seal may be provided which would be obvious to those skilled in the art.
- the fan 1 is rotated in the fan chamber via an engine, not shown in the figure in the direction of arrow A and thus sucks air from the cooking chamber via a central opening in the air baffle centrally and directs them radially outwards, so that they outside of the fan room passes through the baffle again in the cooking chamber.
- Solid and / or liquid particles in particular fat particles of different sizes, which reach in the area of the fan wheel 1, impact on the outer surfaces 6 of the fan blades 3, on the pressure side of the fan wheel, and are discharged along the elevation 7 in the direction of the base plate 2 , If the solids and / or liquid particles reach the end region of the elevation 7 at the front edge 4 of the fan blade 3 (and finally the base plate 2), then the solid and / or liquid particles then released can not directly contact a device radially surrounding the fan wheel 1, such as in the form of a heater, not shown, or a heat exchanger, not shown, are discharged.
- a device radially surrounding the fan wheel 1 such as in the form of a heater, not shown, or a heat exchanger, not shown
- the impeller according to the invention in a cooking appliance thus prevents solids and / or liquid particles, for example, from being deposited directly on a heating device surrounding the impeller 1, and also ensures that air circulated by the impeller 1 can be diverted substantially completely radially the efficiency of the fan 1 is only slightly reduced by the increase 7.
- the fan 1 is replaced by the elevations 7 itself a higher stability.
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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 Lüfterrad mit einer Grundplatte und einer Vielzahl von auf der Grundplatte befestigten Lüfterradschaufeln, wobei die Lüfterradschaufeln im wesentlichen senkrecht auf der Grundplatte angeordnet sind und eine im wesentlichen radiale Anordnung ausbilden, wobei jede Lüfterradschaufel eine radial außen und im wesentlichen senkrecht zur Grundplatte angeordnete Vorderkante, eine radial innen und im wesentlichen senkrecht zur Grundplatte angeordnete Hinterkante, eine auf der Druckseite des Lüfterrads angeordnete Außenfläche und eine auf der Saugseite des Lüfterrads angeordnete Innenfläche aufweist.The present invention relates to a fan with a base plate and a plurality of fan blades mounted on the base plate, wherein the fan blades are arranged substantially perpendicular to the base plate and form a substantially radial arrangement, each fan blade one radially outwardly and substantially perpendicular to the base plate arranged front edge, a radially inside and arranged substantially perpendicular to the base plate trailing edge, arranged on the pressure side of the impeller outer surface and arranged on the suction side of the impeller inner surface.
Lüfterräder sind aus dem Stand der Technik allgemein bekannt und dienen in der Regel dazu, Luft umzuwälzen. Lüfterräder sind in den unterschiedlichsten Formen bekannt, so sind beispielsweise Lüfterräder mit propellerartigen Flügeln oder auch mit schaufelartigen Flügeln bekannt. Ein Problem bei aus dem Stand der Technik bekannten Lüfterrädern ist, daß Feststoff- und/oder Flüssigkeitspartikel, die in der umgewälzten Luft vorhanden sind, sich auf den Flügeln des Lüfterrads abscheiden können, was zu einer Verschmutzung des Lüfterrads führt. Auch kann es durch die bekannten Lüfterräder zu einer unerwünschten Verteilung der Feststoff- und/oder Flüssigkeitspartikel kommen.Fan wheels are well known in the art and typically serve to circulate air. Fan wheels are known in a variety of forms, for example, fan wheels are known with propeller-like wings or with blade-like wings. One problem with fan wheels known in the art is that particulates and / or liquid particles present in the recirculated air may deposit on the blades of the fan wheel, resulting in fouling of the fan wheel. It can also come through the known fan wheels to an undesirable distribution of the solid and / or liquid particles.
Besonders problematisch ist die Umwälzung von Feststoff- und/oder Flüssigkeitspartikeln, insbesondere in Form von Fettpartikeln, wenn das Lüfterrad innerhalb eines Gargeräts angeordnet ist. Das Lüfterrad ist in einem Gargerät zumeist in einem von dem Garraum über ein Luftleitblech getrennten Lüfterraum angeordnet, saugt Luft aus dem Garraum an und leitet diese radial an die Umgebungswände ab, um so eine Luftströmung innerhalb des Gargeräts, vom Garraum in den Lüfterraum und wieder zurück zum Garraum, zu erzeugen. Konzentrisch um das Lüfterrad herum ist häufig eine Heizeinrichtung oder auch ein Wärmetauscher angeordnet, so daß umgewälzte Luft auch an dieser Heizeinrichtung oder diesem Wärmetauscher vorbei geleitet wird, um erwärmt zu werden. Dabei können während eines Garprozeßes auch innerhalb der umgewälzten Luft vorhandene Fettpartikel auf beispielsweise die Heizeinrichtung geleitet werden, wo sie verbrannt werden können, was zu einer Verminderung der Speisenqualität und zu einer Geruchsbelästigung führen kann. Dieses Problem stellt sich insbesondere dann, wenn die Luft innerhalb des Gargeräts permanent durch das Lüfterrad umgewälzt wird, wobei dann die Feststoff- und/oder Flüssigkeitspartikel durch die Umluftströmung ständig in dem Gasvolumen gehalten werden.Particularly problematic is the circulation of solid and / or liquid particles, in particular in the form of fat particles, when the fan is disposed within a cooking appliance. The fan wheel is arranged in a cooking appliance mostly in a separate from the cooking chamber via a baffle fan space, sucks air from the cooking chamber and directs them radially to the surrounding walls, so as an air flow within the cooking appliance, from the cooking chamber in the fan room and back to the cooking chamber, to produce. Concentric around the fan around a heater or a heat exchanger is often arranged so that circulating air is also passed to this heater or this heat exchanger to be heated. In this case, during a cooking process, fat particles present within the circulated air can be conducted to, for example, the heating device, where they can be burned, which can lead to a reduction in the quality of the food and to an odor nuisance. This problem arises in particular when the air within the cooking appliance is permanently circulated through the fan, in which case the solid and / or liquid particles are constantly held in the gas volume by the circulating air flow.
Um das Abscheiden von Feststoff- und/oder Flüssigkeitspartikeln, die durch das Lüfterrad umgewälzt werden, innerhalb eines Gargeräts zu verringern, ist aus der DE 42 06 846 C2 eine Vorrichtung bekannt, die eine Aufprallfläche bzw. einen Abscheidering um das Lüfterrad umfaßt, auf die bzw. auf den ein in dem Gasvolumen herrschender Gasstrom auftritt, wobei sich die Feststoff- und/oder Flüssigkeitspartikel beim Aufprall zumindest teilweise abscheiden und zu einem ersten Ableitbereich laufen können.In order to reduce the deposition of solid and / or liquid particles that are circulated by the fan within a cooking appliance, DE 42 06 846 C2 discloses a device comprising an impingement surface or a separating ring around the impeller, to which or onto which a gas stream prevailing in the gas volume occurs, with the solid and / or liquid particles at least partially separating off on impact and being able to run to a first discharge region.
Ferner ist aus der DE 43 074 05 C2 ein Lüfterrad mit einer Anzahl radial angeordneter Schaufeln, die im wesentlichen im parallelen zur Drehachse des Lüfterrads von einer an einer Gehäusewand des Garraums zugewandten Stützscheibe bzw. Grundplatte vorspringen, bekannt, bei dem mindestens zwischen einigen der Schaufeln nahe der Stützscheibe, jedoch mit Abstand von dieser, Leitbleche angeordnet sind, deren radial äußere Außenkante im wesentlichen mit dem Außenumfang des Lüfterrads fluchten, die radial inneren Innenkanten mit Abstand von der Drehachse des Lüfterrads liegen und die mit der Stützscheibe und den jeweils benachbarten beiden Schaufeln jeweils eine Düseneinrichtung zum Erzeugen einer radial nach außen gerichteten Gasströmung nahe der Stützscheibe bilden.Furthermore, from DE 43 074 05 C2 discloses a fan with a number of radially arranged blades, which project substantially in parallel to the axis of rotation of the fan from a facing on a housing wall of the cooking chamber supporting disk or base plate, in which at least between some of the blades near the support disk, but at a distance from this, baffles are arranged, the radially outer outer edge substantially aligned with the outer periphery of the fan, the radially inner inner edges spaced from the axis of rotation of the fan and with the support disk and the respective adjacent two blades each form a nozzle device for generating a radially outwardly directed gas flow near the support disk.
Aus der US 1,688,345 ist ein Lüfterrad bekannt, bei dem auf der Außenfläche zumindest eines Teils der Lüfterschaufeln zumindest eine Erhöhung angeordnet ist, die sich von der Grundplatte weg erstreckt.From US 1,688,345 a fan is known in which on the outer surface of at least a portion of the fan blades at least one elevation is arranged, which extends away from the base plate.
Nachteilig bei den aus dem Stand der Technik bekannten Vorrichtungen ist jedoch, daß der Wirkungsgrad des Lüfterrads durch die das Lüfterrad umgebenden oder in dem Lüfterrad angeordnete Zusatzvorrichtungen vermindert wird, da die Zusatzvorrichtungen praktisch ein Strömungshindernis für die umgewälzte Luft darstellen.A disadvantage of the known from the prior art devices, however, that the efficiency of the fan wheel is surrounded by the surrounding the fan or disposed in the fan additional devices, since the additional devices represent a flow obstacle for the circulating air practically.
Aufgabe der vorliegenden Erfindung ist es daher, das gattungsgemäße Lüfterrad dahingehend weiterzubilden, daß die Nachteile des Stands der Technik überwunden werden. Insbesondere soll verhindert werden, daß Feststoff- und/oder Flüssigkeitspartikel, die in einer in einem Gargerät umgewälzten Luft vorhanden sind, durch das Lüfterrad unmittelbar auf eine das Lüfterrad umgebende Heizeinrichtung oder einen Wärmetauscher gelangen, ohne daß der Wirkungsgrad des Lüfterrads signifikant verringert wird.Object of the present invention is therefore to develop the generic fan to the effect that the disadvantages of the prior art are overcome. In particular, it is intended to prevent solids and / or liquid particles present in a circulating air in a cooking appliance from passing directly through the fan wheel onto a heating device or heat exchanger surrounding the fan wheel, without the efficiency of the fan wheel being significantly reduced.
Die Aufgabe der vorliegenden Erfindung wird dadurch gelöst, daß auf der Außenfläche zumindest eines Teils der Lüfterradschaufeln zumindest eine Erhöhung angeordnet und/oder ausgebildet ist, die von der Grundplatte beabstandet ausgebildet ist und sich von der Grundplatte weg, im wesentlichen diagonal von der Vorderkante zur Hinterkante der Lüfterradschaufeln erstreckt.The object of the present invention is achieved in that arranged and / or formed on the outer surface of at least a portion of the fan blades at least one elevation which is formed spaced from the base plate and away from the base plate, substantially diagonally from the leading edge to the trailing edge the fan blades extends.
Dabei ist insbesondere vorgesehen, daß die Erhöhung in Form einer Stufe auf und/oder in der Außenfläche ausgebildet ist.It is provided in particular that the increase in the form of a step is formed on and / or in the outer surface.
Mit der Erfindung wird auch vorgeschlagen, daß die Lüfterradschaufeln so gekrümmt ausgebildet sind, daß sich die Außenfläche zwischen der Vorderkante und der Hinterkante nach radial außen krümmt.With the invention it is also proposed that the fan blades are formed curved so that the outer surface between the leading edge and the trailing edge curves radially outward.
Vorteilhaft ist, daß zumindest eine Erhöhung zumindest bereichsweise eine Höhe von etwa 1 bis 10 mm, bevorzugt 2 bis 4 mm, aufweist.It is advantageous that at least one increase, at least in some areas, has a height of approximately 1 to 10 mm, preferably 2 to 4 mm.
Auch erfindungsgemäß kann vorgesehen sein, daß zumindest eine Erhöhung zumindest bereichsweise eine Breite von 1 bis 10 mm, bevorzugt 2 bis 4 mm, aufweist.Also according to the invention it can be provided that at least one increase at least in regions has a width of 1 to 10 mm, preferably 2 to 4 mm.
Das erfindungsgemäße Lüfterrad zeichnet sich bevorzugt dadurch aus, daß der Abstand zumindest einer Erhöhung zur Grundplatte zumindest bereichsweise, insbesondere im Bereich der Vorderkante, mindestens etwa 5 bis 25 mm, bevorzugt 10 bis 20 mm, beträgt.The fan according to the invention is preferably characterized in that the distance of at least one increase to the base plate at least partially, in particular in the region of the leading edge, at least about 5 to 25 mm, preferably 10 to 20 mm.
Auch wird mit der Erfindung ein Stützglied, wie in Form eines Deckrings, der Lüfterradschaufeln auf der der Grundplatte gegenüberliegenden Seite der Lüfterradschaufeln vorgeschlagen.Also, with the invention, a support member, such as in the form of a bezel, the Lüfterradschaufeln proposed on the opposite side of the base plate of the fan blades.
Erfindungsgemäß ist bevorzugt, daß zumindest eine Erhöhung zumindest bereichsweise bogenförmig ausgebildet ist, wobei sie sich vorzugsweise von der jeweiligen Hinterkante zu der jeweiligen Vorderkante weg von dem Stützglied biegt.According to the invention, it is preferable for at least one elevation to be arc-shaped at least in regions, wherein it preferably bends away from the support member from the respective trailing edge to the respective leading edge.
Auch wird vorgeschlagen, daß zumindest eine Erhöhung mit einem Winkel von 45° bis 90° auf die Vorderkante stößt, vorzugsweise mit einen Winkel von 70° bis 90°.It is also proposed that at least one increase at an angle of 45 ° to 90 ° abuts the leading edge, preferably at an angle of 70 ° to 90 °.
Bevorzugt ist, daß zumindest eine Erhöhung zumindest bereichsweise einen Abstand zum Stützglied, insbesondere im Bereich der Hinterkante, von mindestens etwa 1 bis 10 mm, bevorzugt 5 bis 15 mm, aufweist.It is preferred that at least one increase at least in some areas a distance from the support member, in particular in the region of the trailing edge, of at least about 1 to 10 mm, preferably 5 to 15 mm.
Bevorzugt ist ferner, daß zumindest eine Erhöhung durch zumindest einen Draht ausgebildet ist.It is further preferred that at least one increase is formed by at least one wire.
Es wird mit der Erfindung auch vorgeschlagen, daß zumindest eine Erhöhung zumindest bereichsweise auf der Außenfläche der Lüfterradschaufel aufgeschweißt ist.It is also proposed with the invention that at least one increase is welded at least partially on the outer surface of the Lüfterradschaufel.
Erfindungsgemäß kann insbesondere vorgesehen sein, daß auf der Außenfläche zumindest einer Lüfterradschaufel, vorzugsweise jeder Lüfterradschaufel, im Befestigungsbereich zwischen der jeweiligen Erhöhung und der Außenfläche zumindest bereichsweise eine ausgeprägte Kante, wie in Form einer Rinne, auf der in Drehrichtung des Lüfterrades liegenden Seite ausgebildet ist.According to the invention can be provided in particular that on the outer surface of at least one Lüfterradschaufel, preferably each fan blade, at least in regions a pronounced edge, such as in the form of a channel, is formed on the side lying in the direction of rotation of the fan wheel in the mounting region between the respective elevation and the outer surface.
Vorteilhafterweise ist vorgesehen, daß zumindest eine Erhöhung zumindest bereichsweise einen profilierten Querschnitt aufweist, vorzugsweise gewölbt ist, wobei insbesondere der Brennpunkt der Wölbung auf der der Hinterkante zugewandten Seite der Erhöhung liegt, und/oder zumindest eine Nut, vorzugsweise auf der der Hinterkante zugewandten Seite, aufweist.Advantageously, it is provided that at least one increase has a profiled cross-section at least in regions, preferably arched, wherein in particular the focal point of the curvature lies on the side of the elevation facing the trailing edge, and / or at least one groove, preferably on the side facing the trailing edge, having.
Bevorzugt ist ferner, daß zumindest eine Erhöhung auf der der Drehrichtung des Lüfterrads abgewandten Seite zumindest bereichsweise mit der Außenfläche dicht verfugt ist, vorzugsweise mit Silikon.It is further preferred that at least one increase on the side facing away from the direction of rotation of the impeller is at least partially sealed with the outer surface, preferably with silicone.
Ein erfindungsgemäßes Lüfterrad kann in einem Gargerät angeordnet sein.An inventive fan may be arranged in a cooking appliance.
Der vorliegenden Erfindung liegt die überraschende Erkenntnis zugrunde, daß durch Erhöhungen auf den Außenflächen von Lüfterradschaufeln auf einer Grundplatte zum einen vermieden wird, daß in umgewälzter Luft enthaltene Feststoff- und/oder Flüssigkeitspartikel, insbesondere in Form von Fettpartikeln, unmittelbar radial durch das Lüfterrad umgelenkt werden. Vielmehr werden Feststoff- und/oder Flüssigkeitspartikel, die auf die Außenflächen der Lüfterradschaufeln treffen, an der Erhöhung gestoppt und durch die besondere Geometrie der Erhöhung in Richtung der Grundplatte abgeleitet. Im Bereich der Grundplatte können die Feststoff- und/oder Flüssigkeitspartikel dann von den Lüfterradschaufeln abgegeben werden, ohne Vorrichtungen zu treffen, die unmittelbar radial um das Lüfterrad angeordnet sind, wie beispielsweise eine Heizeinrichtung innerhalb eines Gargeräts.The present invention is based on the surprising finding that is avoided by elevations on the outer surfaces of fan blades on a base plate on the one hand that contained in circulating air solids and / or liquid particles, in particular in the form of fat particles are deflected directly radially by the fan , Rather, solid and / or liquid particles that hit the outer surfaces of the Lüfterradschaufeln stopped at the increase and derived by the special geometry of the increase in the direction of the base plate. In the region of the base plate, the solid and / or liquid particles can then be released from the fan blades, without hitting devices that are arranged directly radially around the fan, such as a heater within a cooking appliance.
Da die Feststoff- und/oder Flüssigkeitspartikel von den Lüfterradschaufeln nicht unmittelbar auf das Lüfterrad radial umgebende Vorrichtungen, wie eine Heizeinrichtung, abgegeben werden, wird verhindert, daß insbesondere Fettpartikel auf der Heizeinrichtung verbrannt werden können, was zu einer Verminderung der Speisenqualität und zu einer Geruchsbelästigung führen könnte.Since the solid and / or liquid particles from the fan blades are not directly on the fan radially surrounding devices, such as a heater dispensed, it prevents in particular fat particles can be burned on the heater, resulting in a reduction in food quality and an odor could lead.
Zum anderen wird durch das erfindungsgemäße Lüfterrad auf überraschende Weise erreicht, daß der Wirkungsgrad des Lüfterrads nicht signifikant beeinträchtigt wird, da keine großen Hindernisse im radialen Strömungsverlauf der umgewälzten Luft angeordnet sind. Ferner können die auf den Außenseiten der Lüfterradsschaufeln angeordneten Erhöhungen für eine zusätzliche Stabilität der Lüfterradschaufeln selbst sorgen.On the other hand is achieved by the fan according to the invention in a surprising manner that the efficiency of the fan is not significantly affected, since no major obstacles in the radial flow of the circulating air are arranged. Further For example, the elevations disposed on the outer sides of the fan blades may provide additional stability of the fan blades themselves.
Weitere Merkmale und Vorteile der Erfindung ergeben sich aus der nachfolgenden Beschreibung, in der ein Ausführungsbeispiel der Erfindung anhand einer aus einer einzigen Figur bestehende Zeichnung im Einzelnen erläutert ist. Dabei zeigt die Figur eine perspektivische Ansicht eines erfindungsgemäßen Lüfterrads.Further features and advantages of the invention will become apparent from the following description in which an embodiment of the invention with reference to a single figure figure is explained in detail. The figure shows a perspective view of a fan according to the invention.
Die Figur zeigt perspektivisch eine Ansicht auf ein erfindungsgemäßes Lüfterrad 1, das in einem Lüfterraum eines teilweise dargestellten Gargeräts einbaubar ist, um in Richtung des Pfeils A drehend Luft im Garraum, der vom Lüfterraum durch ein nicht dargestelltes Luftleitblech bereichsweise abgeteilt ist, zu zirkulieren. Das Lüfterrad 1 weist eine Grundplatte 2 auf, auf der eine Vielzahl von Lüfterradschaufeln 3 angeordnet sind, die zum Garraum des Gargeräts gewandt sind. Die Lüfterradschaufeln 3 sind gekrümmt ausgebildet und im wesentlichen senkrecht auf der Grundplatte 2 angeordnet, um eine im wesentlichen radiale Anordnung auf der Grundplatte 2 auszubilden. Jede Lüfterradschaufel 3 weist eine im Betrieb die zu zirkulierende Luft zuerst kontaktierende Hinterkante 5, und eine im Betrieb auf der Druckseite des Lüferrads 1 angeordnete Außenfläche 6 auf. Auf der Außenfläche 6 einer Lüfterradschaufel 3 ist zudem eine Erhöhung 7 vorgesehen, die sich von der Grundplatte 2 weg, im wesentlichen diagonal von einer Vorderkante 4 zur Hinterkante 5 der Lüfterradschaufel 3, erstreckt. Dabei ist die Erhöhung 7 mit einem Abstand von 10 bis 20 mm von der Grundplatte 2 auf der Außenfläche 6 angeordnet. Die Erhöhung 7 kann sich vollständig über die gesamte Breite der Lüfterradschaufel 3 erstrecken, oder einen Abstand zu der der Grundplatte 2 gegenüberliegenden Seite der Lüfterradschaufel 3 aufweisen, wobei dieser Abstand vorzugsweise 5 bis 15 mm beträgt. Auf der der Grundplatte 2 gegenüberliegenden Seite des Lüfterrads 1 ist ein Deckring 8 vorgesehen, der für eine zusätzliche Stabilisierung der Lüfterradschaufeln 3 innerhalb des Lüfterrads 1 sorgt. Die Erhöhung 7 sollte sich von der Außenfläche 6 der Lüfterradschaufel 3 um 2 bis 5 mm abheben und an dem der Luftströmung zugewandten Ende auf der Hinterkante 5 der Lüfterradschaufel 3 mit einer scharfen Kante enden, um eine Ablaufrinne für auftreffende Feststoff- und/oder Flüssigkeitspartikel zu bilden, die ein Weiterströmen der Feststoff- und/oder Flüssigkeitspartikel, über die Erhöhung 7 hinaus, verhindert, sondern ein Führen in Richtung der Grundplatte 2 bewirkt. Überdies kann eine Abdichtung auf der im Strömungsschatten liegenden Seite zwischen Außenfläche 6 und Erhöhung 7 vorgesehen sein.The figure shows a perspective view of an
Diese Abdichtung kann beispielsweise mit Silikon erfolgen, jedoch kann jede andere Abdichtung vorgesehen sein, die sich für einen Fachmann auf diesem Gebiet in naheliegender Weise ergibt.This seal may be made, for example, with silicone, but any other seal may be provided which would be obvious to those skilled in the art.
Die Funktionsweise des erfindungsgemäßen Lüfterrads 1 ist im Anschluß beschrieben.The operation of the
Das Lüfterrad 1 wird im Lüfterraum über einen nicht gezeigten Motor in der Figur in Richtung des Pfeils A gedreht und saugt somit Luft aus dem Garraum über eine mittige Öffnung im Luftleitblech zentral an und leitet diese radial nach außen ab, so daß sie aus dem Lüfterraum außen an Luftleitblechen vorbei wieder in dem Garraum gelangt. Feststoff- und/oder Flüssigkeitspartikel, insbesondere Fettpartikel unterschiedlicher Größe, welche in dem Bereich des Lüfterrads 1 gelangen, prallen dabei auf die Außenflächen 6 der Lüfterradsschaufeln 3, auf der Druckseite des Lüfterrads, und werden entlang der Erhöhung 7 in Richtung auf die Grundplatte 2 abgeleitet. Erreichen die Feststoff- und/oder Flüssigkeitspartikel den Endbereich der Erhöhung 7 an der Vorderkante 4 der Lüfterradschaufel 3 (und schließlich die Grundplatte 2), so können die dann abgegebenen Feststoff- und/oder Flüssigkeitspartikel nicht direkt an eine das Lüfterrad 1 radial umgebende Vorrichtung, wie beispielsweise in Form einer nicht dargestellten Heizvorrichtung oder eines nicht dargestellten Wärmetauschers, abgegeben werden. Durch dieses "Vorbeiführen" der Feststoff- und/oder Flüssigkeitspartikeln an einer Heizvorrichtung und/oder einem Wärmetauscher wird ein Verbrennen derselben vermieden, was zu einer Geruchsbelästigung und zu einer negativen Beeinflussung eines Garergebnisses führen kann. Statt dessen können die abgeschiedenen Feststoff- und/oder Flüssigkeitspartikel entsorgt werden.The
Das erfindungsgemäße Lüfterrad in einem Gargerät verhindert somit, daß Feststoff- und/oder Flüssigkeitspartikel beispielsweise direkt auf einer das Lüfterrad 1 umgebende Heizeinrichtung abgeschieden werden können, und sorgt ferner dafür, daß von dem Lüfterrad 1 umgewälzte Luft im wesentlichen vollständig radial umgeleitet werden kann, da der Wirkungsgrad des Lüfterrads 1 durch die Erhöhung 7 nur unwesentlich verringert wird. Das Lüfterrad 1 erhält durch die Erhöhungen 7 selbst eine höhere Stabilität.The impeller according to the invention in a cooking appliance thus prevents solids and / or liquid particles, for example, from being deposited directly on a heating device surrounding the
- 11
- Lüfterradfan
- 22
- Grundplattebaseplate
- 33
- Lüfterradschaufelfan impeller blade
- 44
- Vorderkanteleading edge
- 55
- Hinterkantetrailing edge
- 66
- Außenflächeouter surface
- 77
- Erhöhungincrease
- 88th
- Deckringcover ring
- AA
- Drehrichtungdirection of rotation
Claims (16)
- Fan impeller (1) having a baseplate (2) and a multiplicity of fan impeller blades (3) secured to the baseplate (2), the fan impeller blades (3) being arranged substantially perpendicularly on the baseplate (2) and forming a substantially radial arrangement, each fan impeller blade (3) having a radially outer front edge (4) arranged substantially perpendicular to the baseplate (2), a radially inner rear edge (5) arranged substantially perpendicular to the baseplate (2), an outer face (6) arranged on the pressure side of the fan impeller (1) and an inner face arranged on the suction side of the fan impeller (1), characterized in that at least one elevation (7) is arranged and/or formed on the outer face (6) of at least some of the fan impeller blades (3), which elevation (7) is formed at a distance from the baseplate (2) and extends away from the baseplate (2), substantially diagonally from the front edge (4) to the rear edge (5) of the fan impeller blades (3).
- Fan impeller according to Claim 1, characterized in that the elevation (7) is produced in the form of a step on and/or in the outer face (6).
- Fan impeller according to Claim 1 or 2, characterized in that the fan impeller blades (3) are curved in such a way that the outer face (6) curves radially outwards between the front edge (4) and the rear edge (5).
- Fan impeller according to one of the preceding claims, characterized in that at least one elevation (7), at least in regions, has a height of approximately 1 to 10 mm, preferably 2 to 4 mm.
- Fan impeller according to one of the preceding claims, characterized in that at least one elevation (7), at least in regions, has a width from 1 to 10 mm, preferably 2 to 4 mm.
- Fan impeller according to one of the preceding claims, characterized in that the distance from at least one elevation (7) to the baseplate (2), at least in regions, in particular in the region of the front edge (4), is at least approximately 5 to 25 mm, preferably 10 to 20 mm.
- Fan impeller according to one of the preceding claims, characterized by a support member (8), for example in the form of a covering ring, for the fan impeller blades (3) on the opposite side of the fan impeller blades (3) from the baseplate (2).
- Fan impeller according to Claim 7, characterized in that at least one elevation (7), at least in regions, is arcuate in form, preferably bending away from the support member (8) from the respective rear edge (5) to the respective front edge (4).
- Fan impeller according to one of the preceding claims, characterized in that at least one elevation (7) meets the front edge (4) at an angle of from 45° to 90°, preferably at an angle of from 70° to 90°.
- Fan impeller according to one of Claims 7 to 9, characterized in that at least one elevation (7), at least in regions, is at a distance from the support member (8), in particular in the region of the rear edge (5), of at least approximately 1 to 10 mm, preferably 5 to 15 mm.
- Fan impeller according to one of the preceding claims, characterized in that at least one elevation (7) is formed by at least one wire.
- Fan impeller according to one of the preceding claims, characterized in that at least one elevation (7), at least in regions, is welded to the outer face (6) of the fan impeller blade (3).
- Fan impeller according to one of the preceding claims, characterized in that on the outer face (6) of at least one fan impeller blade (3), preferably each fan impeller blade (3), in the securing region between the respective elevation (7) and the outer face (6), a pronounced edge, for example in the form of a channel, is formed at least in regions on the side which lies in the direction of rotation of the fan impeller.
- Fan impeller according to one of the preceding claims, characterized in that at least one elevation (7), at least in regions, has a profiled cross section, preferably is convex, with in particular the focal point of the convexity lying on that side of the elevation (7) which faces the rear edge (5), and/or having at least one groove, preferably on the side which faces the rear edge (5).
- Fan impeller according to one of the preceding claims, characterized in that at least one elevation (7), at least in regions, is joined in a sealed manner to the outer surface (6), preferably using silicone, on the side which faces away from the direction of rotation of the fan impeller (1).
- Fan impeller according to one of the preceding claims in a cooking device.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10239246A DE10239246C1 (en) | 2002-08-22 | 2002-08-22 | 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 |
| DE10239246 | 2002-08-22 | ||
| PCT/DE2003/002640 WO2004020837A1 (en) | 2002-08-22 | 2003-08-06 | Fan impeller with integrated precipitation of fat particles, in particular for a cooking device |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP1530682A1 EP1530682A1 (en) | 2005-05-18 |
| EP1530682B1 true EP1530682B1 (en) | 2006-05-31 |
| EP1530682B2 EP1530682B2 (en) | 2015-04-15 |
Family
ID=27618865
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP20030790684 Expired - Lifetime EP1530682B2 (en) | 2002-08-22 | 2003-08-06 | Fan impeller with integrated precipitation of fat particles, in particular for a cooking device |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US7165942B2 (en) |
| EP (1) | EP1530682B2 (en) |
| JP (1) | JP4255912B2 (en) |
| DE (2) | DE10239246C1 (en) |
| WO (1) | WO2004020837A1 (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1961970A1 (en) | 2007-02-26 | 2008-08-27 | Josip Pavetic | Radial fan and radial blower fitter with locking protection and radial fan |
| EP1961967A1 (en) * | 2007-02-26 | 2008-08-27 | Josip Pavetic | Radial fan wheel and radial fan incorporating the same |
| EP1961969A2 (en) | 2007-02-26 | 2008-08-27 | Josip Pavetic | Radial fan wheel |
| EP2143958A1 (en) | 2008-07-07 | 2010-01-13 | Josip Pavetic | Ventilator integrated into a tube |
| EP2372163A1 (en) | 2010-04-01 | 2011-10-05 | Convotherm Elektrogeräte GmbH | Fan |
| WO2018158226A1 (en) | 2017-03-03 | 2018-09-07 | Convotherm-Elektrogeräte Gmbh | Fan wheel |
| WO2018158260A1 (en) | 2017-03-03 | 2018-09-07 | Convotherm-Elektrogeräte Gmbh | Fan wheel |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| US7112043B2 (en) * | 2003-08-29 | 2006-09-26 | General Motors Corporation | Compressor impeller thickness profile with localized thick spot |
| EP1961966A1 (en) * | 2007-02-26 | 2008-08-27 | Josip Pavetic | Radial fan impeller |
| EP2284401B1 (en) | 2009-08-11 | 2013-01-30 | Rational AG | Ventilator wheel and cooking device |
| US9689263B2 (en) | 2009-10-27 | 2017-06-27 | General Electric Company | Droplet catcher for centrifugal compressor |
| ITUB20152807A1 (en) * | 2015-08-03 | 2017-02-03 | Ma Ti Ka S R L | FAN FOR OVENS FOR COOKING FOOD |
| DE102016212162A1 (en) * | 2016-07-04 | 2018-01-04 | Convotherm-Elektrogeräte Gmbh | Commercial cooking appliance |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US262642A (en) * | 1882-08-15 | Fan-blower | ||
| US168345A (en) * | 1875-10-05 | Improvement in car-couplings | ||
| US1688345A (en) * | 1927-08-16 | 1928-10-23 | Buffalo Hammer Mill Corp | Centrifugal fan |
| DE729947C (en) * | 1937-02-09 | 1943-01-05 | Danneberg & Quandt Alleiniger | Fan impeller |
| US2616764A (en) * | 1948-05-22 | 1952-11-04 | Earl M Parrish | Wear resistant blower surface |
| FR2588925A1 (en) * | 1985-10-23 | 1987-04-24 | Etri Sa | FAN EQUIPPED WITH MEANS TO REDUCE THE NOISE GENERATED BY THE ROTATION OF ITS BLADES |
| FR2606465B1 (en) * | 1986-11-06 | 1989-01-13 | Ducellier & Cie | ROTATING ELECTRIC MACHINE FAN |
| DE3814721A1 (en) † | 1988-04-30 | 1989-11-09 | Asea Brown Boveri | RADIAL FAN WITH INTEGRATED DIRT SEPARATOR |
| DE4206846C2 (en) * | 1992-03-04 | 1995-11-16 | Rational Gmbh | Device for separating solid and / or liquid particles from a gas volume |
| DE4220960A1 (en) * | 1992-06-25 | 1994-01-05 | Turbowerke Meisen Ventilatoren | Blades for axial and radial flow machines - use series of segments and connecting elements to create variable flow contour |
| DE4307405C1 (en) | 1993-03-09 | 1994-11-17 | Rational Gmbh | Fan wheel |
| 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 |
-
2002
- 2002-08-22 DE DE10239246A patent/DE10239246C1/en not_active Expired - Fee Related
-
2003
- 2003-08-06 EP EP20030790684 patent/EP1530682B2/en not_active Expired - Lifetime
- 2003-08-06 WO PCT/DE2003/002640 patent/WO2004020837A1/en active IP Right Grant
- 2003-08-06 US US10/525,192 patent/US7165942B2/en not_active Expired - Lifetime
- 2003-08-06 JP JP2004531451A patent/JP4255912B2/en not_active Expired - Lifetime
- 2003-08-06 DE DE50303600T patent/DE50303600D1/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1961970A1 (en) | 2007-02-26 | 2008-08-27 | Josip Pavetic | Radial fan and radial blower fitter with locking protection and radial fan |
| EP1961967A1 (en) * | 2007-02-26 | 2008-08-27 | Josip Pavetic | Radial fan wheel and radial fan incorporating the same |
| EP1961969A2 (en) | 2007-02-26 | 2008-08-27 | Josip Pavetic | Radial fan wheel |
| EP2143958A1 (en) | 2008-07-07 | 2010-01-13 | Josip Pavetic | Ventilator integrated into a tube |
| EP2372163A1 (en) | 2010-04-01 | 2011-10-05 | Convotherm Elektrogeräte GmbH | Fan |
| WO2011120659A1 (en) | 2010-04-01 | 2011-10-06 | Convotherm-Elektrogeräte Gmbh | Fan wheel with deflecting means for impurities |
| WO2018158226A1 (en) | 2017-03-03 | 2018-09-07 | Convotherm-Elektrogeräte Gmbh | Fan wheel |
| WO2018158260A1 (en) | 2017-03-03 | 2018-09-07 | Convotherm-Elektrogeräte Gmbh | Fan wheel |
Also Published As
| Publication number | Publication date |
|---|---|
| DE50303600D1 (en) | 2006-07-06 |
| DE10239246C1 (en) | 2003-08-21 |
| US7165942B2 (en) | 2007-01-23 |
| JP2005536683A (en) | 2005-12-02 |
| WO2004020837A1 (en) | 2004-03-11 |
| EP1530682A1 (en) | 2005-05-18 |
| US20060165528A1 (en) | 2006-07-27 |
| JP4255912B2 (en) | 2009-04-22 |
| EP1530682B2 (en) | 2015-04-15 |
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