EP1984675A1 - Filter element for extractor hood - Google Patents

Filter element for extractor hood

Info

Publication number
EP1984675A1
EP1984675A1 EP07703723A EP07703723A EP1984675A1 EP 1984675 A1 EP1984675 A1 EP 1984675A1 EP 07703723 A EP07703723 A EP 07703723A EP 07703723 A EP07703723 A EP 07703723A EP 1984675 A1 EP1984675 A1 EP 1984675A1
Authority
EP
European Patent Office
Prior art keywords
coating
filter element
filter
layers
cover
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.)
Withdrawn
Application number
EP07703723A
Other languages
German (de)
French (fr)
Inventor
Udo Reiff
Volkmar Uebele
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BSH Hausgeraete GmbH
Original Assignee
BSH Bosch und Siemens Hausgeraete GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BSH Bosch und Siemens Hausgeraete GmbH filed Critical BSH Bosch und Siemens Hausgeraete GmbH
Publication of EP1984675A1 publication Critical patent/EP1984675A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/20—Removing cooking fumes
    • F24C15/2035—Arrangement or mounting of filters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/10—Filter screens essentially made of metal
    • B01D39/12—Filter screens essentially made of metal of wire gauze; of knitted wire; of expanded metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/10—Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/04—Additives and treatments of the filtering material
    • B01D2239/0471—Surface coating material
    • B01D2239/0478—Surface coating material on a layer of the filter
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/06—Filter cloth, e.g. knitted, woven non-woven; self-supported material
    • B01D2239/065—More than one layer present in the filtering material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2275/00—Filter media structures for filters specially adapted for separating dispersed particles from gases or vapours
    • B01D2275/10—Multiple layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2275/00—Filter media structures for filters specially adapted for separating dispersed particles from gases or vapours
    • B01D2275/30—Porosity of filtering material
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31786—Of polyester [e.g., alkyd, etc.]

Definitions

  • the present invention relates to a filter element for an extractor hood.
  • filter elements in particular filter cassettes, are used to remove impurities, in particular fat particles, from the vapor which is sucked in by the extractor hood.
  • the filter cassettes are detachably attached to the extractor hood so that they can be separated from the extractor hood for cleaning purposes.
  • JP 05293318A proposes a filter element in which a coating film, for example a silicone resin film, is applied to a filter laminate.
  • the filter laminate in this case consists of a layer of non-woven metal fibers, which is pressed between two expanded metal layers.
  • the disadvantage with this filter element is that in the coating of the laminate, the filter properties of the filter element can be impaired, since the coating is applied both to the expanded metal layers and to the intermediate metal fiber layer.
  • the object of the invention is thus to provide a filter element which is easy to clean and in which the filter property can be adjusted specifically.
  • a filter element for an extractor hood which comprises at least one cover layer and at least one intermediate layer.
  • the filter element is characterized in that a coating is provided on at least one part of at least one surface of at least the cover layers and the at least one intermediate layer is free of this coating.
  • the properties of the intermediate layer are not changed compared with an uncoated filter element and can be adjusted in a known manner, such as the suitable choice of mesh size and the number of intermediate layers.
  • the filter element When the filter element is used, first the side of the filter element facing the point of origin of the vapor and, in particular, the cover layer provided there are flown. At this is thus with the most deposits of impurities can be expected. At this filter layer come to the deposited from the fumes impurities still from the environment on this cover layer impinging impurities, such as dust, added to the fat-laden top layer easily.
  • the coating on at least this cover layer on the one hand, the accumulation of impurities can be reduced and on the other hand, the cleaning of the filter element can be simplified.
  • the possible duration of use of a filter element between two cleaning steps is extended and increases the total possible useful life of the filter element due to the improved cleaning options.
  • the coating is applied to the at least one cover layer prior to assembling the filter layers.
  • an exclusive coating of the cover layer can be ensured in a simple manner. Inadvertent coating of an adjacent intermediate layer can not take place here and the filter properties of the filter element are therefore maintained in a simple manner.
  • the top layer can also be reliably coated on all sides. It is also possible to coat only the side of the cover layer, which is flown by vapors in the installed state, whereby the edges of passages in the cover layer are also coated in order to prevent the adhesion of impurities in the passages or openings.
  • the filter layers of the filter element are preferably expanded metal layers. Expanded metal lends itself to the application of a coating, since in this case the passages are clearly predetermined and can be adjusted in size compared to fiber materials. Furthermore, the cover layer can be clearly defined in expanded metal layers. Finally, expanded metal layers are held together in filter elements usually by pure mechanical connection technology. A pressing or other treatment of the expanded metal layers, which optionally involves treatment at elevated temperatures, does not occur in this case. Thus, the coating can be applied before assembling the filter layers and damage to the coating during assembly of the filter element is not to be feared.
  • the mesh size of the cover layers in the uncoated state is greater than the mesh width of the at least one intermediate layer.
  • the mesh size is the size of the passages or the distance between webs in the respective filter layers. These are determined by the web width and the web distance. Due to a larger mesh size in the cover layers, the layer be taken into account of the coating, which leads to a reduction of the mesh size. Thus, it can be ensured in the filter element after the coating of the cover layers that in all filter layers the same mesh size is present or the mesh size in the cover layer is still greater than the mesh size in the intermediate layers. This dimensioning of the mesh size is of fluidic importance, since it can come to a backlog of Wrasens below the filter element with too small mesh size in the flowing from the vapor cover layer.
  • the mesh size in the top layer may be in a mesh size in the intermediate layer of for example 4mm, in the range of 5 to 6mm.
  • the thickness of the coating can range from 5 ⁇ m up to 1mm. Preferably, however, a small layer thickness of the coating in the range of 8 to 30mm is selected.
  • the filter element has a frame for receiving the edges of the filter layers and the frame is provided with a coating at least on the outside thereof.
  • the hygiene can be increased when using the filter element.
  • the frame does not contribute to the actual filtering process, it is exposed to the incoming vapors.
  • the use of a frame makes it possible to assemble several filter layers without having to use a thermal process or a pressing process to connect the filter layers.
  • at least one of the cover layers may be provided with the coating prior to assembly of the filter element and damage to the coating is not to be feared.
  • the coating is preferably an alkali-resistant coating.
  • an alkali-resistant coating in addition to simplifying the removal of adhered impurities, protection against the attack of the surface of the cover layer by alkalis can be created.
  • the filter element is exposed especially when cleaning in a dishwasher.
  • the filter material which is, for example, aluminum, would be attacked by the alkalis in the dishwasher and thereby the visual appearance of the filter element would be deteriorated, at least after repeated cleaning.
  • the filter element is used in an extractor hood so that the coated cover layer faces the incoming vapors. Since, however, when the filter element is removed and cleaned, the side facing away from the vapor is also affected. If, for example, dishwashing agents are exposed, preferably both cover layers are coated.
  • the coating may be a powder coating according to one embodiment.
  • Powder coatings can be applied to filter layers, in which openings are provided for the passage for cleaning vapors, without having to worry about clogging or closing the openings.
  • the powder applied coating can be fixed by heat treatment, for example.
  • the maintenance of the passage opening and the targeted setting of the coating thickness can ensure the setting of a predetermined size of the passage opening in a powder coating.
  • a coated by powder coating coating, such as a paint is also characterized by good adhesion to the surface of the cover layer.
  • the coating material is preferably a lacquer.
  • a lacquer and in particular a hard lacquer the coating can also withstand mechanical attacks, in particular scratch-resistant. These mechanical attacks can occur, for example, during manual cleaning of the filter element.
  • the coating material is an epoxy polyester clearcoat.
  • This lacquer combines the properties required for the purpose achieved according to the invention.
  • the alkali resistance of the coating is ensured and the visual appearance is not affected by the transparency of the paint.
  • the coating achieves a chemical-resistant sealing of the material of the cover layer against oxidation processes that occur due to the attack of strong alkalis, for example in the dishwasher.
  • the paint has a low shovenpolartician and therefore has a very low tendency to fouling.
  • the mechanical and chemical strength values of this paint are sufficient to make the surface of the cover layer resistant to alkalis in the dishwasher.
  • FIG. 1 shows a schematic, perspective top view of a filter element
  • Figure 2 is a schematic, perspective bottom view of a filter element
  • FIG. 3 shows a schematic sectional view through the filter element according to FIG. 1
  • FIG. 4 shows a detailed view of the filter layers.
  • the filter element 1 is a filter cartridge.
  • This filter cassette 1 comprises a frame 2 and filter layers 3 held therein.
  • the filter cassette 1 can be used in an extractor hood (not shown) in the region of the suction surface and act there as a grease filter.
  • latching elements 5 are provided in the illustrated embodiment on the front side 4 of the filter cartridge.
  • the latching elements 5 can be actuated via an actuating mechanism which is provided in a housing 6 provided for this purpose in the region of the filter layers 3.
  • a handle 7 is provided on the underside of the housing 6, via which the actuating mechanism can be operated. In the area of the housing 6, the filter layers 3 are recessed.
  • the filter layers 3 are present.
  • the arrangement of the filter layers 3 is shown schematically in the sectional view in FIG.
  • the filter layers 3 extend in the area defined by the frame 2 and are placed one on top of the other.
  • the upper filter layer and the lower filter layer form cover layers 8, 9.
  • the individual filter layers 3 are made of expanded metal.
  • the filter layers 3 have webs 31 and openings 32 formed between the webs, which are also referred to as meshes.
  • the mesh widths that is to say the width of the openings 32
  • the cover layers 8 and 9 have the construction shown schematically in FIG.
  • the material of the filter layers 3, or the expanded metal is in particular aluminum. This is coated in the cover layers 8 and 9 with a coating 11 of a clearcoat with beading effect.
  • the original mesh size 32 'of the cover layer 8, 9 is therefore greater than the mesh width 32 necessary for the application.
  • the coating 11 is applied to the expanded metal of the cover layers 8, 9 by a powder coating method. In this way, a uniform coating of the webs 31 can be ensured while closing the openings or meshes, 32 are prevented.
  • cover layers 8, 9 can now be taken with uncoated intermediate layers 10 in a frame 2.
  • the frame 2 is coated with a coating 11 prior to assembly of the filter cartridge 1.
  • a filter cartridge 1 is provided in which all outwardly facing sides are coated. Since the cover layers 8, 9 are coated before assembly, the intermediate layers 10 are free of the coating 11 and the suction power of the hood, which can be achieved with the filter element 1 is not affected.
  • the production costs for the filter cartridge 1 by coating only the cover layers 8 and 9 and the frame 2 are lower than in the case of a coating of all filter layers 3.
  • the coating 1 1, as shown in Figure 4, the webs 31 of the cover layer 8 completely surrounded. Here, all sides of the cover layer 8 are coated. But it is also possible that the cover layer 8 is coated exclusively on one side and at the edges of the openings 32. In this case, the part 11 'of the coating 11 located below the dashed line shown in FIG. 4 would be omitted. In this embodiment, the cover layer 8 is integrated into the filter cassette 1 such that the uncoated side faces the intermediate layers 10.
  • the paint which is applied as a coating 1 1 on the at least one cover layer 8, for example, may be a two-component paint, which cures by chemical crosslinking. In particular, it is a paint with reduced surface polarity.
  • An epoxypolyester paint has proven to be particularly suitable. If this is used as a clearcoat, the usual appearance of the filter element 1 can be maintained. In particular, an optical emergence of the filter cassette 1 with respect to the extractor hood screen, which for example consists of stainless steel when eating, is avoided. The filter element blends into the overall visual impression.
  • the present invention thus provides a filter element for an extractor hood in which the cover layers are resistant to chemicals and alkalis due to the coating.
  • the use of the filter element in an extractor hood due to the coating, in particular in the case of a coating with reduced surface polarity, can lead to a bead-off effect, as a result of which contamination of the filter element can be minimized.
  • the cleaning of the filter element can be simplified.
  • by the sealing of the surface of the cover layer by the coating to recognize an anti-oxidation effect, by which an oxidation of the material of the cover layer is avoided. Due to the coating Thus, spotting that occurs on uncoated metal filters after multiple cleanings exposing the filter element to chemicals can be prevented.
  • the cover layers can be given a scratch resistance by the coating, which ensures a long durability of the coating and thus protection for the cover layers.

Abstract

The invention relates to a filter element for an extractor hood, comprising at least one covering layer (8, 9) and at least one intermediate layer (10). Said filter element (1) is characterised in that a coating (11) is applied to at least one of the covering layers (8, 9) on at least one part of at least one surface, and the at least one intermediate layer (10) is free of said coating (11). The optical appearance of the inventive filter element remains unaltered even after repeated cleaning.

Description

Filterelement für Dunstabzugshaube Filter element for extractor hood
Die vorliegende Erfindung betrifft ein Filterelement für eine Dunstabzugshaube.The present invention relates to a filter element for an extractor hood.
Bei Dunstabzugshauben werden Filterelemente, insbesondere Filterkassetten, verwendet um aus dem Wrasen, der durch die Dunstabzugshaube angesaugt wird, Verunreinigungen, insbesondere Fettpartikel abzuscheiden. Die Filterkassetten sind an der Dunstabzugshaube lösbar befestigt, so dass diese von der Dunstabzugshaube zu Reinigungszwecken getrennt werden können. Um die Entfernung der an dem Filter abgeschiedenen Verunreinigungen vereinfachen zu können, ist beispielsweise in der JP 05293318A ein Filterelement vorgeschlagen, bei dem auf ein Filterlaminat ein Beschichtungsfilm, beispielsweise ein Silikonharzfilm, aufgebracht wird. Das Filterlaminat besteht hierbei aus einer Schicht aus ungewobenen Metallfasern, die zwischen zwei Streckmetalllagen eingepresst ist.In extractor hoods, filter elements, in particular filter cassettes, are used to remove impurities, in particular fat particles, from the vapor which is sucked in by the extractor hood. The filter cassettes are detachably attached to the extractor hood so that they can be separated from the extractor hood for cleaning purposes. In order to be able to simplify the removal of the impurities deposited on the filter, JP 05293318A, for example, proposes a filter element in which a coating film, for example a silicone resin film, is applied to a filter laminate. The filter laminate in this case consists of a layer of non-woven metal fibers, which is pressed between two expanded metal layers.
Der Nachteil bei diesem Filterelement besteht darin, dass bei der Beschichtung des Laminates die Filtereigenschaften des Filterelementes beeinträchtigt werden können, da die Beschichtung sowohl auf die Streckmetalllagen als auch auf die dazwischen liegende Metallfaserschicht aufgebracht wird.The disadvantage with this filter element is that in the coating of the laminate, the filter properties of the filter element can be impaired, since the coating is applied both to the expanded metal layers and to the intermediate metal fiber layer.
Aufgabe der Erfindung ist es somit ein Filterelement zu schaffen, das einfach zu reinigen ist und bei dem die Filtereigenschaft gezielt eingestellt werden kann.The object of the invention is thus to provide a filter element which is easy to clean and in which the filter property can be adjusted specifically.
Diese Aufgabe wird erfindungsgemäß gelöst durch ein Filterelement für eine Dunstabzugshaube, das zumindest eine Decklage und zumindest eine Zwischenlage umfasst. Das Filterelement zeichnet sich dadurch aus, dass auf zumindest einem Teil zumindest einer Oberfläche mindestens der Decklagen eine Beschichtung vorgesehen ist und die mindestens eine Zwischenlage frei von dieser Beschichtung ist.This object is achieved by a filter element for an extractor hood, which comprises at least one cover layer and at least one intermediate layer. The filter element is characterized in that a coating is provided on at least one part of at least one surface of at least the cover layers and the at least one intermediate layer is free of this coating.
Indem nur die Decklagen mit der Beschichtung versehen werden, wird eine gezielte Einstellung der Filtereigenschaften, insbesondere des Durchlasses an angesaugter Luft, die die Leistungsfähigkeit der Dunstabzugshaube beeinflusst, ermöglicht. Die Eigenschaften der Zwischenlage werden gegenüber einem unbeschichteten Filterelement nicht verändert und können auf bekannte Weise, wie beispielsweise die geeignete Wahl der Maschengröße und der Anzahl der Zwischenlagen eingestellt werden. Beim Einsatz des Filterelementes wird zunächst die dem Entstehungsort des Wrasen zugewandte Seite des Filterelementes und insbesondere die dort vorgesehene Decklage angeströmt. An dieser wird somit mit den meisten Ablagerungen von Verunreinigungen zu rechnen sein. An dieser Filterlage kommen zu den aus dem Wrasen abgeschiedenen Verunreinigungen noch aus der Umgebung auf diese Decklage auftreffende Verunreinigungen, wie Staub, hinzu, die sich an der fettbehafteten Decklage leicht anlagern. Durch das Vorsehen der Beschichtung auf zumindest dieser Decklage kann zum einen das Anlagern der Verunreinigungen reduziert werden und zum anderen die Reinigung des Filterelementes vereinfacht werden. Somit wird die mögliche Einsatzdauer eines Filterelementes zwischen zwei Reinigungsschritten verlängert und die gesamt mögliche Nutzungsdauer des Filterelementes wegen der verbesserten Reinigungsmöglichkeiten erhöht.By providing only the cover layers with the coating, a targeted adjustment of the filter properties, in particular the passage of sucked air, which affects the performance of the hood, allows. The properties of the intermediate layer are not changed compared with an uncoated filter element and can be adjusted in a known manner, such as the suitable choice of mesh size and the number of intermediate layers. When the filter element is used, first the side of the filter element facing the point of origin of the vapor and, in particular, the cover layer provided there are flown. At this is thus with the most deposits of impurities can be expected. At this filter layer come to the deposited from the fumes impurities still from the environment on this cover layer impinging impurities, such as dust, added to the fat-laden top layer easily. By providing the coating on at least this cover layer on the one hand, the accumulation of impurities can be reduced and on the other hand, the cleaning of the filter element can be simplified. Thus, the possible duration of use of a filter element between two cleaning steps is extended and increases the total possible useful life of the filter element due to the improved cleaning options.
Vorzugsweise wird die Beschichtung vor dem Zusammensetzen der Filterlagen auf die mindestens eine Decklage aufgebracht. Durch diese Herstellungsart kann eine ausschließliche Beschichtung der Decklage auf einfache Weise gewährleistet werden. Eine versehentliche Beschichtung einer benachbarten Zwischenlage kann hierbei nicht erfolgen und die Filtereigenschaften des Filterelementes werden daher auf einfache Weise aufrechterhalten. Zudem kann die Decklage hierbei auch zuverlässig auf allen Seiten beschichtet werden. Auch eine Beschichtung nur der Seite der Decklage, die im Einbauzustand von Wrasen angeströmt wird, ist möglich, wobei auch die Ränder von Durchlässen in der Decklage, beschichtet werden, um ein Anhaften von Verunreinigungen in den Durchlässen beziehungsweise Öffnungen zu verhindern.Preferably, the coating is applied to the at least one cover layer prior to assembling the filter layers. By this production, an exclusive coating of the cover layer can be ensured in a simple manner. Inadvertent coating of an adjacent intermediate layer can not take place here and the filter properties of the filter element are therefore maintained in a simple manner. In addition, the top layer can also be reliably coated on all sides. It is also possible to coat only the side of the cover layer, which is flown by vapors in the installed state, whereby the edges of passages in the cover layer are also coated in order to prevent the adhesion of impurities in the passages or openings.
Die Filterlagen des Filterelementes stellen vorzugsweise Streckmetalllagen dar. Streckmetall bietet sich zur Aufbringung einer Beschichtung an, da hierbei im Vergleich zu Fasermaterialien die Durchlässe klar vorgegeben sind und in ihrer Größe eingestellt werden können. Weiterhin lässt sich bei Streckmetalllagen die Decklage klar definieren. Schließlich werden Streckmetalllagen in Filterelementen in der Regel durch reine mechanische Verbindungstechnik zusammen gehalten. Ein Verpressen oder eine andere Behandlung der Streckmetalllagen, die gegebenenfalls eine Behandlung bei erhöhten Temperaturen mit sich bringt, tritt hierbei nicht auf. Somit kann die Beschichtung vor dem Zusammenstellen der Filterlagen aufgebracht werden und eine Beschädigung der Beschichtung beim Zusammenbau des Filterelementes ist nicht zu befürchten.The filter layers of the filter element are preferably expanded metal layers. Expanded metal lends itself to the application of a coating, since in this case the passages are clearly predetermined and can be adjusted in size compared to fiber materials. Furthermore, the cover layer can be clearly defined in expanded metal layers. Finally, expanded metal layers are held together in filter elements usually by pure mechanical connection technology. A pressing or other treatment of the expanded metal layers, which optionally involves treatment at elevated temperatures, does not occur in this case. Thus, the coating can be applied before assembling the filter layers and damage to the coating during assembly of the filter element is not to be feared.
Gemäß einer bevorzugten Ausführungsform ist die Maschenweite der Decklagen im unbeschichteten Zustand größer als die Maschenweite der mindestens einen Zwischenlage. Als Maschenweite wird die Größe der Durchlässe beziehungsweise der Abstand zwischen Stegen in den jeweiligen Filterlagen bezeichnet. Diese bestimmen sich durch die Stegbreite und den Stegabstand. Durch eine größere Maschenweite in den Decklagen kann die Schichtdi- cke der Beschichtung berücksichtigt werden, die zu einer Verringerung der Maschenweite führt. Somit kann bei dem Filterelement nach der Beschichtung der Decklagen sichergestellt werden, dass in allen Filterlagen die gleiche Maschengröße vorliegt oder die Maschengröße in der Decklage weiterhin größer als die Maschengröße in den Zwischenlagen ist. Diese Dimensionierung der Maschengröße ist von strömungstechnischer Bedeutung, da es bei einer zu geringen Maschengröße in der vom Wrasen angeströmten Decklage zu einem Aufstau des Wrasens unterhalb des Filterelementes kommen kann.According to a preferred embodiment, the mesh size of the cover layers in the uncoated state is greater than the mesh width of the at least one intermediate layer. The mesh size is the size of the passages or the distance between webs in the respective filter layers. These are determined by the web width and the web distance. Due to a larger mesh size in the cover layers, the layer be taken into account of the coating, which leads to a reduction of the mesh size. Thus, it can be ensured in the filter element after the coating of the cover layers that in all filter layers the same mesh size is present or the mesh size in the cover layer is still greater than the mesh size in the intermediate layers. This dimensioning of the mesh size is of fluidic importance, since it can come to a backlog of Wrasens below the filter element with too small mesh size in the flowing from the vapor cover layer.
Die Maschengröße in der Decklage kann bei einer Maschengröße in der Zwischenlage von beispielsweise 4mm, im Bereich von 5 bis 6mm liegen. Die Dicke der Beschichtung kann im Bereich von 5μm bis zu 1 mm liegen. Vorzugsweise wird aber eine geringe Schichtdicke der Beschichtung im Bereich von 8 bis 30mm gewählt.The mesh size in the top layer may be in a mesh size in the intermediate layer of for example 4mm, in the range of 5 to 6mm. The thickness of the coating can range from 5μm up to 1mm. Preferably, however, a small layer thickness of the coating in the range of 8 to 30mm is selected.
Gemäß einer Ausführungsform weist das Filterelement einen Rahmen zur Aufnahme der Kanten der Filterlagen auf und der Rahmen ist zumindest an dessen Außenseite mit einer Beschichtung versehen. Hierdurch kann die Hygiene bei der Verwendung des Filterelementes gesteigert werden. Obwohl der Rahmen als solcher nicht zum eigentlichen Filtervorgang beiträgt, ist dieser den anströmenden Wrasen ausgesetzt. Zudem erlaubt, wie bereits erwähnt die Verwendung eines Rahmens, das Zusammenfügen mehrerer Filterlagen, ohne ein thermisches Verfahren oder ein Pressverfahren zum Verbinden der Filterlagen einsetzen zu müssen. Somit kann zumindest eine der Decklagen vor dem Zusammenbau des Filterelementes mit der Beschichtung versehen sein und eine Beschädigung der Beschichtung ist nicht zu befürchten.According to one embodiment, the filter element has a frame for receiving the edges of the filter layers and the frame is provided with a coating at least on the outside thereof. As a result, the hygiene can be increased when using the filter element. Although the frame as such does not contribute to the actual filtering process, it is exposed to the incoming vapors. In addition, as already mentioned, the use of a frame makes it possible to assemble several filter layers without having to use a thermal process or a pressing process to connect the filter layers. Thus, at least one of the cover layers may be provided with the coating prior to assembly of the filter element and damage to the coating is not to be feared.
Die Beschichtung ist vorzugsweise eine alkalibeständige Beschichtung. Durch die Verwendung einer alkalibeständigen Beschichtung kann neben der Vereinfachung des Entfernens von angehafteten Verunreinigungen, auch ein Schutz gegen den Angriff der Oberfläche der Decklage durch Alkalien geschaffen werden. Einem solchen Angriff ist das Filterelement insbesondere bei Reinigung in einer Spülmaschine ausgesetzt. Ohne die Beschichtung würde das Filtermaterial, das beispielsweise Aluminium ist, von den Laugen in der Spülmaschine angegriffen und dadurch würde das optische Erscheinungsbild des Filterelementes zumindest nach mehrmaliger Reinigung verschlechtert werden.The coating is preferably an alkali-resistant coating. Through the use of an alkali-resistant coating, in addition to simplifying the removal of adhered impurities, protection against the attack of the surface of the cover layer by alkalis can be created. Such an attack, the filter element is exposed especially when cleaning in a dishwasher. Without the coating, the filter material, which is, for example, aluminum, would be attacked by the alkalis in the dishwasher and thereby the visual appearance of the filter element would be deteriorated, at least after repeated cleaning.
Es ist erfindungsgemäß möglich nur eine der Decklagen in dem Filterelement zu beschichten. Hierbei wird das Filterelement so in einer Dunstabzugshaube verwendet, dass die beschichtete Decklage dem anströmenden Wrasen zugewandt ist. Da aber bei einer Entnahme des Filterelementes und Reinigung desselben auch die dem Wrasen abgewandte Seite Mit- teln, wie beispielsweise Spülmittel ausgesetzt wird, werden vorzugsweise beide Decklagen beschichtet.It is possible according to the invention to coat only one of the cover layers in the filter element. In this case, the filter element is used in an extractor hood so that the coated cover layer faces the incoming vapors. Since, however, when the filter element is removed and cleaned, the side facing away from the vapor is also affected. If, for example, dishwashing agents are exposed, preferably both cover layers are coated.
Indem nur die Decklagen und nicht auch die Zwischenlagen des Filterelementes beschichtet werden, sind die Herstellungskosten des Filterelementes verringert.By coating only the cover layers and not also the intermediate layers of the filter element, the manufacturing costs of the filter element are reduced.
Die Beschichtung kann gemäß einer Ausführungsform eine Pulverbeschichtung sein. Pulverbeschichtungen lassen sich auf Filterlagen, in denen Öffnungen für den Durchlass zur Reinigung von Wrasen vorgesehen sind, aufbringen ohne ein Verstopfen beziehungsweise Verschließen der Öffnungen befürchten zu müssen. Die In Pulverform aufgebrachte Beschichtung kann beispielsweise durch Wärmebehandlung fixiert werden. Anders als bei einem Tauchbeschichtungsverfahren, bei dem die Öffnungen gegebenenfalls durch das Be- schichtungsmaterial verschlossen werden, kann bei einer Pulverbeschichtung die Aufrechterhaltung der Durchlassöffnung und durch ein gezieltes Einstellen der Beschichtungsdicke die Einstellung einer vorgegebenen Größe der Durchlassöffnung gewährleistet werden. Eine durch Pulverbeschichtung aufgebrachte Beschichtung, beispielsweise ein Lack, zeichnet sich zudem durch eine gute Haftung an der Oberfläche der Decklage aus.The coating may be a powder coating according to one embodiment. Powder coatings can be applied to filter layers, in which openings are provided for the passage for cleaning vapors, without having to worry about clogging or closing the openings. The powder applied coating can be fixed by heat treatment, for example. In contrast to a dip-coating method in which the openings are optionally closed by the coating material, the maintenance of the passage opening and the targeted setting of the coating thickness can ensure the setting of a predetermined size of the passage opening in a powder coating. A coated by powder coating coating, such as a paint, is also characterized by good adhesion to the surface of the cover layer.
Das Beschichtungsmaterial ist vorzugsweise ein Lack. Durch Verwendung eines Lackes und insbesondere eines Hartlackes, kann die Beschichtung auch mechanischen Angriffen standhalten, insbesondere kratzfest sein. Diese mechanischen Angriffe können beispielsweise bei der manuellen Reinigung des Filterelementes auftreten.The coating material is preferably a lacquer. By using a lacquer and in particular a hard lacquer, the coating can also withstand mechanical attacks, in particular scratch-resistant. These mechanical attacks can occur, for example, during manual cleaning of the filter element.
Gemäß einer Ausführungsform ist das Beschichtungsmaterial ein Epoxypolyesterklarlack. Dieser Lack vereint die für den erfindungsgemäß erzielten Zweck benötigten Eigenschaften. Insbesondere wird die Alkalibeständigkeit der Beschichtung gewährleistet und das optische Erscheinungsbild aufgrund der Transparenz des Lackes nicht beeinflusst. Zudem wird durch die Beschichtung eine chemikalienbeständige Versiegelung des Materials der Decklage gegen Oxidationsprozesse erzielt, die durch den Angriff starker Alkalien, wie beispielsweise in der Spülmaschine, auftreten. Weiterhin weist der Lack eine geringe Oberflächenpolarität auf und hat daher eine sehr geringe Verschmutzungsneigung. Schließlich sind auch die mechanischen und chemischen Festigkeitswerte dieses Lackes ausreichend um die Oberfläche der Decklage gegen Alkalien in der Spülmaschine resistent zu machen.In one embodiment, the coating material is an epoxy polyester clearcoat. This lacquer combines the properties required for the purpose achieved according to the invention. In particular, the alkali resistance of the coating is ensured and the visual appearance is not affected by the transparency of the paint. In addition, the coating achieves a chemical-resistant sealing of the material of the cover layer against oxidation processes that occur due to the attack of strong alkalis, for example in the dishwasher. Furthermore, the paint has a low Oberflächenpolarität and therefore has a very low tendency to fouling. Finally, the mechanical and chemical strength values of this paint are sufficient to make the surface of the cover layer resistant to alkalis in the dishwasher.
Die Erfindung wird im Folgenden erneut unter Bezugnahme auf die beiliegenden Zeichnungen beschrieben. Es zeigen: Figur 1 : eine schematische, perspektivische Draufsicht auf ein Filterelement; Figur 2: eine schematische, perspektivische Unteransicht eines Filterelementes; Figur 3: eine schematische Schnittansicht durch das Filterelement nach Figur 1 ; und Figur 4: eine Detailansicht der Filterlagen.The invention will be described again below with reference to the accompanying drawings. Show it: FIG. 1 shows a schematic, perspective top view of a filter element; Figure 2 is a schematic, perspective bottom view of a filter element; FIG. 3 shows a schematic sectional view through the filter element according to FIG. 1; and FIG. 4 shows a detailed view of the filter layers.
In der in Figur 1 dargestellten Ausführungsform ist das Filterelement 1 eine Filterkassette. Diese Filterkassette 1 umfasst einen Rahmen 2 und darin gehaltene Filterlagen 3. Die Filterkassette 1 kann in einer Dunstabzugshaube (nicht dargestellt) im Bereich der Ansaugfläche eingesetzt werden und dort als Fettfilter fungieren. Zur Befestigung der Filterkassette 1 an der Dunstabzugshaube sind in der dargestellten Ausführungsform an der Vorderseite 4 der Filterkassette 1 Einrastelemente 5 vorgesehen. Die Einrastelemente 5 können über einen Betätigungsmechanismus, der in einem dafür im Bereich der Filterlagen 3 vorgesehenen Gehäuse 6 vorgesehen ist, betätigt werden. Wie sich aus Figur 2 entnehmen lässt, ist an der Unterseite des Gehäuses 6 ein Griff 7 vorgesehen, über den der Betätigungsmechanismus bedient werden kann. Im Bereich des Gehäuses 6 sind die Filterlagen 3 ausgespart.In the embodiment shown in Figure 1, the filter element 1 is a filter cartridge. This filter cassette 1 comprises a frame 2 and filter layers 3 held therein. The filter cassette 1 can be used in an extractor hood (not shown) in the region of the suction surface and act there as a grease filter. For fastening the filter cartridge 1 to the extractor hood 1 latching elements 5 are provided in the illustrated embodiment on the front side 4 of the filter cartridge. The latching elements 5 can be actuated via an actuating mechanism which is provided in a housing 6 provided for this purpose in the region of the filter layers 3. As can be seen from Figure 2, a handle 7 is provided on the underside of the housing 6, via which the actuating mechanism can be operated. In the area of the housing 6, the filter layers 3 are recessed.
Im übrigen Bereich des Rahmens 2 liegen die Filterlagen 3 vor. Die Anordnung der Filterlagen 3 ist schematisch in der Schnittansicht in Figur 3 gezeigt. Die Filterlagen 3 erstrecken sich in der durch den Rahmen 2 definierten Fläche und sind aufeinander gelegt. Hierbei bilden die obere Filterlage und die untere Filterlage Decklagen 8, 9.In the remaining area of the frame 2, the filter layers 3 are present. The arrangement of the filter layers 3 is shown schematically in the sectional view in FIG. The filter layers 3 extend in the area defined by the frame 2 and are placed one on top of the other. In this case, the upper filter layer and the lower filter layer form cover layers 8, 9.
Die einzelnen Filterlagen 3 bestehen aus Streckmetall. Somit besitzen die Filterlagen 3 Stege 31 und zwischen den Stegen gebildete Öffnungen 32, die auch als Maschen bezeichnet werden.The individual filter layers 3 are made of expanded metal. Thus, the filter layers 3 have webs 31 and openings 32 formed between the webs, which are also referred to as meshes.
In den Decklagen 8, 9 und den Zwischenlagen 10 sind in der dargestellten Ausführungsform die Maschenweiten, das heißt die Breite der Öffnungen 32, gleich groß. Allerdings besitzen die Decklagen 8 und 9 den in Figur 4 schematisch gezeigten Aufbau. Das Material der Filterlagen 3, beziehungsweise des Streckmetalls, ist insbesondere Aluminium. Diese ist bei den Decklagen 8 und 9 mit einer Beschichtung 11 aus einem Klarlack mit Abperleffekt überzogen. Die ursprüngliche Maschenweite 32' der Decklage 8, 9 ist daher größer als die für den Einsatz notwendige Maschenweite 32. Die Beschichtung 1 1 wird auf das Streckmetall der Decklagen 8, 9 durch ein Pulverbeschichtungsverfahren aufgebracht. Hierdurch kann eine gleichmäßige Beschichtung der Stege 31 gewährleistet werden und gleichzeitig ein Verschließen der Öffnungen beziehungsweise Maschen, 32 verhindert werden. Die so beschichteten Decklagen 8, 9 können nun mit unbeschichteten Zwischenlagen 10 in einen Rahmen 2 gefasst werden. Vorzugsweise ist auch der Rahmen 2 vor dem Zusammenbau der Filterkassette 1 mit einer Beschichtung 11 überzogen. Auf diese Weise wird eine Filterkassette 1 geschaffen, bei der alle nach außen gewandten Seiten beschichtet sind. Da die Decklagen 8, 9 vor dem Zusammenbau beschichtet werden, sind die Zwischenlagen 10 frei von der Beschichtung 11 und die Saugleistung der Dunstabzugshaube, die mit dem Filterelement 1 erzielt werden kann, wird nicht beeinträchtigt. Zudem sind die Herstellungskosten für die Filterkassette 1 durch die Beschichtung nur der Decklagen 8 und 9 und des Rahmens 2 geringer als bei einer Beschichtung aller Filterlagen 3.In the cover layers 8, 9 and the intermediate layers 10, the mesh widths, that is to say the width of the openings 32, are the same in the illustrated embodiment. However, the cover layers 8 and 9 have the construction shown schematically in FIG. The material of the filter layers 3, or the expanded metal, is in particular aluminum. This is coated in the cover layers 8 and 9 with a coating 11 of a clearcoat with beading effect. The original mesh size 32 'of the cover layer 8, 9 is therefore greater than the mesh width 32 necessary for the application. The coating 11 is applied to the expanded metal of the cover layers 8, 9 by a powder coating method. In this way, a uniform coating of the webs 31 can be ensured while closing the openings or meshes, 32 are prevented. The thus coated cover layers 8, 9 can now be taken with uncoated intermediate layers 10 in a frame 2. Preferably, the frame 2 is coated with a coating 11 prior to assembly of the filter cartridge 1. In this way, a filter cartridge 1 is provided in which all outwardly facing sides are coated. Since the cover layers 8, 9 are coated before assembly, the intermediate layers 10 are free of the coating 11 and the suction power of the hood, which can be achieved with the filter element 1 is not affected. In addition, the production costs for the filter cartridge 1 by coating only the cover layers 8 and 9 and the frame 2 are lower than in the case of a coating of all filter layers 3.
Die Beschichtung 1 1 kann, wie in Figur 4 gezeigt, die Stege 31 der Decklage 8 vollständig umgeben. Hierbei sind alle Seiten der Decklage 8 beschichtet. Es ist aber auch möglich, dass die Decklage 8 ausschließlich an einer Seite und an den Rändern der Öffnungen 32 beschichtet ist. In diesem Fall würde der unterhalb der in Figur 4 gezeigten gestrichelten Linie befindliche Teil 11 ' der Beschichtung 1 1 entfallen. Bei dieser Ausführungsform wird die Decklage 8 so in die Filterkassette 1 integriert, dass die unbeschichtete Seite den Zwischenlagen 10 zugewandt ist.The coating 1 1, as shown in Figure 4, the webs 31 of the cover layer 8 completely surrounded. Here, all sides of the cover layer 8 are coated. But it is also possible that the cover layer 8 is coated exclusively on one side and at the edges of the openings 32. In this case, the part 11 'of the coating 11 located below the dashed line shown in FIG. 4 would be omitted. In this embodiment, the cover layer 8 is integrated into the filter cassette 1 such that the uncoated side faces the intermediate layers 10.
Der Lack, der als Beschichtung 1 1 auf die mindestens eine Decklage 8 aufgebracht wird, kann beispielsweise ein Zwei-Komponenten-Lack sein, der durch chemische Vernetzung aushärtet. Insbesondere handelt es sich um einen Lack mit verringerter Oberflächenpolarität. Als besonders geeignet hat sich ein Epoxypolyesterlack erwiesen. Wird dieser als Klarlack verwendet, kann das übliche Erscheinungsbild des Filterelementes 1 beibehalten werden. Insbesondere wird ein optisches Hervortreten der Filterkassette 1 gegenüber dem Dunstab- zugshaubenschirm, der bei Essen beispielsweise aus Edelstahl besteht, vermieden werden. Das Filterelement fügt sich vielmehr in den gesamten optischen Eindruck ein.The paint, which is applied as a coating 1 1 on the at least one cover layer 8, for example, may be a two-component paint, which cures by chemical crosslinking. In particular, it is a paint with reduced surface polarity. An epoxypolyester paint has proven to be particularly suitable. If this is used as a clearcoat, the usual appearance of the filter element 1 can be maintained. In particular, an optical emergence of the filter cassette 1 with respect to the extractor hood screen, which for example consists of stainless steel when eating, is avoided. The filter element blends into the overall visual impression.
Mit der vorliegenden Erfindung kann somit ein Filterelement für eine Dunstabzugshaube geschaffen werden, bei dem die Decklagen aufgrund der Beschichtung Chemikalien- und alkalienbeständig sind. Beim Einsatz des Filterelementes in einer Dunstabzugshaube kann es aufgrund der Beschichtung, insbesondere bei einer Beschichtung mit verringerter Oberflächenpolarität, zu einem Abperleffekt, wodurch eine Verunreinigung des Filterelementes minimiert werden kann. Weiterhin kann aufgrund der Beständigkeit der Beschichtung das Reinigen des Filterelementes vereinfacht werden. Zudem ist durch die Versiegelung der Oberfläche der Decklage durch die Beschichtung ein Antioxidationseffekt zu erkennen, durch den ein Oxidieren des Materials der Decklage vermieden wird. Aufgrund der Beschichtung kann somit eine Fleckenbildung, die bei unbeschichteten Metallfiltern nach mehrfacher Reinigung auftritt, bei der das Filterelement Chemikalien ausgesetzt wird, verhindert werden. Zudem kann den Decklagen durch die Beschichtung eine Kratzfestigkeit verliehen werden, die eine lange Beständigkeit der Beschichtung und dadurch des Schutzes für die Decklagen gewährleistet. The present invention thus provides a filter element for an extractor hood in which the cover layers are resistant to chemicals and alkalis due to the coating. The use of the filter element in an extractor hood, due to the coating, in particular in the case of a coating with reduced surface polarity, can lead to a bead-off effect, as a result of which contamination of the filter element can be minimized. Furthermore, due to the durability of the coating, the cleaning of the filter element can be simplified. In addition, by the sealing of the surface of the cover layer by the coating to recognize an anti-oxidation effect, by which an oxidation of the material of the cover layer is avoided. Due to the coating Thus, spotting that occurs on uncoated metal filters after multiple cleanings exposing the filter element to chemicals can be prevented. In addition, the cover layers can be given a scratch resistance by the coating, which ensures a long durability of the coating and thus protection for the cover layers.

Claims

Patentansprüche claims
1. Filterelement für eine Dunstabzugshaube, das zumindest eine Decklage (8, 9) und zumindest eine Zwischenlage (10) umfasst, dadurch gekennzeichnet, dass zumindest auf einer der Decklagen (8, 9) auf zumindest einem Teil zumindest einer Oberfläche eine Beschichtung (11 ) vorgesehen ist und die mindestens eine Zwischenlage (10) frei von dieser Beschichtung (1 1 ) ist.1. Filter element for an extractor hood, comprising at least one cover layer (8, 9) and at least one intermediate layer (10), characterized in that at least on one of the cover layers (8, 9) on at least a part of at least one surface, a coating (11 ) is provided and the at least one intermediate layer (10) is free of this coating (1 1).
2. Filterelement nach Anspruch 1 , dadurch gekennzeichnet, dass die Beschichtung (1 1 ) vor dem Zusammensetzen der Filterlagen (3, 8, 9, 10) auf die mindestens eine Decklage (8, 9) aufgebracht wird.2. Filter element according to claim 1, characterized in that the coating (1 1) prior to assembly of the filter layers (3, 8, 9, 10) on the at least one cover layer (8, 9) is applied.
3. Filterelement nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, dass die Filterlagen (3, 8, 9, 10) Streckmetalllagen sind.3. Filter element according to one of claims 1 or 2, characterized in that the filter layers (3, 8, 9, 10) are expanded metal layers.
4. Filterelement nach Anspruch 3, dadurch gekennzeichnet, dass die Maschenweite (32') der Decklagen (8, 9) im unbeschichteten Zustand größer als die Maschenweite (32) an den Zwischenlagen (10) ist.4. Filter element according to claim 3, characterized in that the mesh width (32 ') of the cover layers (8, 9) in the uncoated state is greater than the mesh width (32) on the intermediate layers (10).
5. Filterelement nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass das Filterelement (1 ) einen Rahmen (2) zur Aufnahme der Kanten der Filterlagen (3, 8, 9, 10) aufweist und der Rahmen (2) zumindest an dessen Außenseite mit einer Beschichtung (11 ) versehen ist.5. Filter element according to one of claims 1 to 4, characterized in that the filter element (1) has a frame (2) for receiving the edges of the filter layers (3, 8, 9, 10) and the frame (2) at least at its Outside is provided with a coating (11).
6. Filterelement nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass die Beschichtung (11 ) eine alkalibeständige Beschichtung ist.6. Filter element according to one of claims 1 to 5, characterized in that the coating (11) is an alkali-resistant coating.
7. Filterelement nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass die Beschichtung (11 ) eine Pulverbeschichtung ist.7. Filter element according to one of claims 1 to 6, characterized in that the coating (11) is a powder coating.
8. Filterelement nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass das Beschichtungsmaterial ein Lack ist.8. Filter element according to one of claims 1 to 7, characterized in that the coating material is a paint.
9. Filterelement nach Anspruch 8, dadurch gekennzeichnet, dass das Beschichtungsmaterial ein Epoxypolyesterklarlack ist. 9. Filter element according to claim 8, characterized in that the coating material is a Epoxypolyesterklarlack.
EP07703723A 2006-02-08 2007-01-09 Filter element for extractor hood Withdrawn EP1984675A1 (en)

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Also Published As

Publication number Publication date
CN101379349B (en) 2015-10-21
US8197568B2 (en) 2012-06-12
US20090053543A1 (en) 2009-02-26
CN101379349A (en) 2009-03-04
WO2007090700A1 (en) 2007-08-16
DE102006005807A1 (en) 2007-08-16

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