EP2829808A1 - Extractor hood - Google Patents

Abstract

There is provided an extractor hood (10) with an immovable exhaust duct (11) and a hood part (12) with filter elements (121) and an extract (13), the extract consisting of at least one detachable insert part (133) which alone and / or or in cooperation with a frame part (132) forms a narrow, largely free of pressure-reducing side openings air passage (138) between an edge zone of the insert part (133) with an entrance slit (135) at the front end of the air duct and the immovable hood part (12).

Description

Field of the invention

The present invention relates to an extractor hood with a grease filter and a suction system for applying this grease filter under negative pressure to promote gases to be purified, in particular by cooking fumes contaminated air through this grease filter, and with a suction in front of the grease filter, which by Luftleitvorrichtungen, as in flaps, drawer-like extracts and the like. Is changeable.

background

It is expedient if, in the case of a kitchen extractor hood, which is arranged above a cooking hob, the receiving area of the extractor hood for the cooking fumes at least covers the area of the hob, so that as many as possible of the rising cooking fumes be detected by the extractor hood. Although correspondingly large embodiments of extractor hoods and food are functionally extremely advantageous, but they work in smaller kitchens rather bulky and disturbing for the operation of the hob.

For this reason, extractor hoods have been implemented, such as in the published patent applications EP 0603637 . EP 1624254 or EP 1842008 described, which are in itself smaller in construction and are additionally equipped with louvers, such as plates, drawer-like extracts and the like. To increase the collecting surface of the hood. Moreover, it is known, for example, by drawer-shaped extracts, which are equipped with full-fat filters to increase the intake of the cooker hood.

Although these known extractor hoods with extracts already represent an improvement, extracts are required for modern kitchen equipment that affect the appearance of the stove as little as possible and should therefore be designed as inconspicuous as possible.

Presentation of the invention

According to the present invention, there is provided an extractor hood having an immovable exhaust duct and a hood part with filter elements and an extract, the extract consisting of at least one detachable insert part which alone and / or in cooperation with a frame part has a narrow, pressure-reducing openings and / or Elements largely free air channel between an edge zone of the insert part and the immovable hood part forms with a likewise substantially free entrance gap at the front end of the air duct.

The air duct is preferably bounded by substantially air-impermeable walls, so that the greatest possible negative pressure in the region of the peripheral entrance gap can be generated.

In particular, the peripheral entrance to the air duct and the air duct itself are kept free of filter elements that could cause a significant pressure gradient in the channel. Such filters are e.g. close-meshed, especially multi-layered grease filters or porous filters such as activated carbon filters. Advantageously du4rch the waiver of such elements an effective Randabsaugung can be realized with an extract, which has a very low height. This height of the air duct can be a maximum of 5 cm, more preferably a maximum of 3cm.

The detachable built-in part can in the region of the air duct for the deposition of fat droplets u.ä. coarse filter elements in the form of sieves or gratings, which are oriented transversely or obliquely to the substantially horizontally directed air flow in the air duct in the installed state of the insert part. The coarse filter elements preferably touch at least once the upper and lower boundary surfaces of the air duct. More preferably, the coarse filter elements are wave-shaped so as to contact either the upper or the lower boundary surface or both at least twice at positions separated in the horizontal direction. As a supplement or as an alternative to these coarse filter elements, the mounting part may also have guide surfaces which deflect the air flow behind the entrance slit, but before entering the hood part in the direction of the lower or upper boundary surface of the air duct.

These filter elements and / or baffle are shaped or mounted so that they do not cause significant pressure drop. This is synonymous with the installation of such Elements a large part of the suction effect, which is generated at the hood part facing the end of the air duct, but also at the located at the opposite end of the air duct air inlet gap available.

Preferably, the upper and / or the lower boundary surface of the air duct are parts of the detachable insert part. Thus, the surfaces which define the air gap and the air duct and at which thus deposit more fat residues, can be cleaned with the insert separately from the rest of the hood. For this purpose, the material of the insert is preferably dishwasher safe, e.g. made of stainless steel.

With the inventive design of air duct and air gap can thus be generated at the front edge of the drawer a very strong suction, which particularly well prevents the spread of cooking fumes forward in the room.

In addition, the device also has one or more filter elements which cover a lower inlet opening of the hood part during operation. The filter formed by this element or elements primarily serves as a grease separator and is either fixedly mounted on the hood part or movably mounted and coupled to the drawer.

In the case of a stationary mounted on the hood part filter, the filter may be mounted at a height which is below the lower boundary surface of the air channel, so that the extract is in the retracted state above the filter. Alternatively, the filter may be stationarily mounted at a height intermediate the levels of the lower and upper boundary surfaces of the air duct. This pushes the filter when inserted into the air duct, so that the filter is in the inserted state between the ceiling and the bottom of the air duct.

As a third variant, the stationary mounted filter can also be at a level above the upper one Be mounted limiting surface of the air duct. In this variant, it may be advantageous to provide the underside of the air duct with a rising guide surface whose top edge is at least very close to the bottom of the stationary filter. This guide surface thus separates the air duct from the remaining lower entry surface. The air which enters through the air duct is also sucked through part of the stationary filter.

If the filter is movably mounted to the hood part and coupled to the drawer, it can be mounted with hinges or an abutment and edges so that the trailing edge moves when pulling in or out of the drawer in an oblique or vertical direction in the hood. The filter may also be foldable with the folding axis (s) moving in or out of the drawer in an oblique or vertical direction in the hood.

The extractor hood still has in a known manner in the exhaust duct on a blower for generating a negative pressure. Furthermore, it can also have further filters mounted in the exhaust duct, particularly in recirculation mode. In a likewise known manner, the air sucked in at the lower region of the extractor hood and through the front air gap can either be transported outwards through a line or circulated back into the room in recirculating air mode.

Brief description of the drawings

• FIG. 1A eine perspektivische Ansicht einer Dunstabzugshaube gemäss einer Ausführungsform der Erfindung;
• FIG. 1B eine perspektivische Ansicht der Unterseite der Dunstabzugshaube aus FIG. 1A;
• FIG. 2A einen vertikalen Schnitt einer Dunstabzugshaube gemäss einer Ausführungsform der Erfindung mit starr eingebautem Filter;
• FIG. 2B - 2C ein Detail eines vertikalen Schnitts einer Dunstabzugshaube gemäss weiterer Ausführungsformen der Erfindung mit starr eingebautem Filter;
• FIG. 2D -2F vertikale Schnitte einer Dunstabzugshaube gemäss weiterer Ausführungsformen der Erfindung mit starr eingebautem Filter; und
• FIG. 3A - 3B vertikale Schnitte einer Dunstabzugshaube gemäss weiterer Ausführungsformen der Erfindung mit beweglich eingebautem Filter.

Further embodiments, advantages and applications of the invention will become apparent from the dependent claims and from the following description with reference to FIGS. Showing:

• FIG. 1A a perspective view of an extractor hood according to an embodiment of the invention;
• FIG. 1B a perspective view of the underside of the hood FIG. 1A ;
• FIG. 2A a vertical section of an extractor hood according to an embodiment of the invention with a rigid filter built-in;
• FIG. 2B - 2C a detail of a vertical section of a cooker hood according to further embodiments of the invention with a rigid filter built-in;
• FIG. 2D -2F vertical sections of a cooker hood according to further embodiments of the invention with a rigid filter built-in; and
• FIG. 3A-3B vertical sections of a cooker hood according to further embodiments of the invention with movably installed filter.

Ways to carry out the invention

A schematic perspective full view of an extractor hood 10 is in the Figures 1A and 1B shown. The hood consists of a vent or chimney 11, a lower, firmly connected to the outlet shaft 11 hood part 12 and an extract 13, which is mounted in the horizontal direction movable in the manner of a drawer in the hood part 12 and / or on the exhaust duct 11. An extractor hood of this kind is installed, for example, over a stove.

In the following description, "up" or "down" refers to directions parallel to the vertical axis of the duct, "front" refers to the side with the pullout, and "rear" refers to the opposite side of the hood. The "depth" is considered as the distance from front to back and as "width" the extension perpendicular to the vertical axis and the Depth. If necessary, these definitions should be transferred analogously to terms equivalent to the terms thus defined. The terms "separable,""employable," and "clean," and equivalent terms, are to be understood as being solvable and cleanable by ordinary means common in a household. Furthermore, a material is considered to be dishwasher safe when it has no significant discoloration or shape changes after at least 100 normal cleanings in a commercial dishwasher.

Typically, the exhaust duct 11 terminates in a port 111, which either opens into a pipeline or in air outlets (not shown), through which filtered air can be circulated back into the space with the cooking hob. In the exhaust duct 11 and the fans or fans can be accommodated, suck the air from the bottom of the hood 10 and transport through the exhaust duct upwards.

On the firmly connected hood part 12, primarily grease filters 121 are mounted, which close off the hood part 12 at least for the substantial part of its base area downwards. As shown, the grease filter may consist of one part or of several parallel part filters. The filter 121 is detachably mounted in the rigid hood part 12 and can be solved without tools for cleaning the hood part 12 and used again. The hood part may also have other operating and lighting elements 122, as partially in FIG FIG. 1B ande indicated.

The drawer 13 consists essentially of a grip edge 131, a frame 132 and an insert 133 releasably secured in the frame. The insert 133 can be removed from the frame without tools by loosening an anchor 134 and cleaned as a separate part and again without tools be used. This insert is preferably designed as dishwasher-safe, eg completely made of stainless steel. It comprises essentially all parts of the drawer, where the haze or vapors are conducted past.

The insert 133 forms at its front edge a gap 135 through which air is sucked in operation of the fan. This gap has substantially the same length as the insert 133. To prevent a pressure loss at this gap, the gap 135 is largely free of lattice or sieve-shaped elements. Thereby and through one to possibly coarse grease filters as below with reference to FIG. 2B and 2C also described largely free air duct in the extract can be a strong extractor through the gap 135 reach even at a low overall height of the extract.

The total height of the extension is 25 mm for extracts with a width of up to 50 cm, 55 cm or 60 cm and 30 mm for extracts from 60 to 90 cm or even up to 120 cm. The height of the drawer is determined in an area which excludes the front edge 131 with the handle. In order not to take into account local structures and shapes of the drawer 13, the height of the drawer 13 may be determined, for example, as an average value along the entire width of the insert 133 at about half the depth of the insert or a line parallel to that line.

The inner structure of the extract will be in the other Figures 2 and 3 shown, which are described below. In this case, the variants described differ essentially by the arrangement of the grease filter 121 with respect to the statement 13. As far as possible, the same reference numerals are used as in the Figures 1A and 1B , Wherein dashed arrows indicate air flows, as they may occur during operation of the hood. Double arrows with solid lines indicate movements of the elements of the hood during operation.

In the cross section of FIG. 2A again a discharge shaft 11, a fixed hood part 12 and an extract 13 are shown. In the exhaust duct itself filter elements 112 are attached with activated carbon to allow recirculation mode. In the example shown, the filter elements are arranged vertically and form in the exhaust duct 11 smaller shafts, which are alternately closed at the bottom or top by plates, so that the air sucked from below flows transversely through the filter elements 112 to continue to rise in the chimney. Instead of the illustrated filter elements 112 also horizontally arranged or transversely arranged filter plates can be used.

The exhaust duct 11 goes down into the wider, but also stationary mounted hood part 12, whose underside represents a vent opening, which is covered by a grease filter 121 during operation. This filter 121 is detachably but rigidly connected to a bottom plate of the hood part 12. The bottom plate also serves as a support for lamp sockets 122 and the stationary part of the suspension for the drawer 13th

The drawer has a handle edge 131 at the front. This completes the frame 132 from the front. The removable insert 133 consists of a ceiling portion 136 and a bottom portion 137, which constitute the upper and lower boundary surfaces for an air passage 138. In the example shown, both the ceiling part 136 and the bottom part 137 have no further openings, so that in the region of the air channel 138 itself no air can enter the channel.

The ceiling part 136 has in the front part a downwardly bent front guide surface 136-1, the vertically rising air into the horizontal air passage 138 passes. The distance between the leading edges of the baffle 136-1 and the leading edge of the bottom portion 137 defines a downwardly open air gap 135 for the rim suction function of the hood 10.

The bottom part 137 has at its trailing edge an obliquely upward rear guide surface 137-1. This improves the suction through the air duct 138 by means of the above the filter elements 112 mounted (and not shown) fan. With the design and surface of this rear guide surface 137-1 can be adjusted at least in an approximate mass, which part of the total suction generated by the suction motor in the exhaust duct 11 the air duct 138 and thus the air gap 135 in the extract 13 and for the intake through the grease filter 121 of the hood part 12 is provided.

The distance between the ceiling part 136 and the bottom part 137 essentially defines the height of the air duct 138 or, with the restrictions already mentioned above, the height of the drawer 13.

In the example below FIG. 2A the extract is stored and dimensioned so that the bottom part 137 is pushed during insertion over the grease filter 121 and the extract 13 is thus in the inserted state thus substantially between the grease filter 121 and the chimney 11.

As in the example of FIG. 2A shown, the air passage 138 may be free of obstacles such as filter elements, which cause an additional pressure drop. In this case, the air duct has at least no extended structures between the bottom part 137 and the ceiling part 136, but is formed as smooth as possible.

In the example of a modified drawer 13, the in FIG. 2 B is shown enlarged, however, in the region of the air channel 138, a lattice-shaped expanded metal 139 between the front edge of the ceiling portion 136 and the rear edge of the bottom portion 137 is clamped transversely to the air duct. This grid 139 serves to improve the grease separation and can be removed from the frame 132 with the entire insert 133 for cleaning become. Ideally, the grid 139 is formed and mounted so that it restricts the air flow through the air duct 138 only slightly, for example, as expanded metal or simple single-layer perforated plate.

In the in FIG. 2C In the example shown, the grid 139 is an expanded metal in wave form, which touches the ceiling part 136 with the wave crests and the bottom part 137 in the deepest part of the wave troughs.

The grid 139 may be fixedly connected to the ceiling portion 136 and / or the floor portion 137, e.g. held by a weld or a screwed connection or by elastic action of the grid itself in the air duct.

The grid may be continuous throughout the width of the drawer 13 or may be divided into segments, e.g. in parallel but staggered orientation or phase-shifted used strips which are parallel to the flow direction of the air in the air passage 138.

Instead of a grid-shaped Abscheidevlechs that spans the entire height (and width) of the air duct at least once, the ceiling portion 136 and / or the bottom portion 137 may also include baffles, which extend only into the air passage 138 without completely bridge it. These baffles change the flow direction of the air sucked through the air duct 138 and thus lead to an improved separation of fat droplets from the intake air. In FIG. 2D the ceiling part 136 is provided with such an additional air guide plate 136-2, which extends obliquely into the air duct 138 and thus directs the air flowing substantially horizontally along the channel downwards in the direction of the bottom part 137.

The additional air baffle 136-2 need not continuously span the entire width of the insert 133 and the air duct 138, but can also be shorter, for example, in the width and in the Depth staggered arranged Teilleitflächen are formed, which taken together, the width at least substantially span, so that no part of the air flow without the desired deflection can pass through the zone with the baffles. The shorter in width sections may also be mounted, for example alternately on the ceiling part 136 and the bottom part 137.

In the variant that in FIG. 2E illustrated, is the bottom portion 137 of the insert 133 below the grease filter 121. In this arrangement, the grease filter 121 slides during insertion of the drawer 13 in the air passage 138. The bottom part 137 is formed substantially as a smooth surface without a guide surface.

In the variant of FIG. 2F the grease filter 121 is mounted on a level which is above the extract 13. In the example, the level is selected so that the rearward guide surface 137-1, which extends obliquely upwards, abuts against the rear edge of the bottom part 137 with its upper edge on the underside of the grease filter 121. In this variant of the invention, the air sucked in through the air duct 138 passes on the way into the exhaust duct 11 a part of the grease filter 121 and is thus further cleaned of grease residues. The grease filter is not connected in this case with the bottom plate of the hood part 12, but mounted centrally or at the upper end of the hood part 12.

In the previous variants and examples of the invention, the extract 13 and the grease filter 121 are not coupled, ie the grease filter remains stationary or fixed, even if the extract is moved. In the following embodiments of the invention, illustrated in Figures 3A and 3B, the grease filter is coupled either directly or indirectly to the drawer so that movement of the drape translates into movement of the filter or at least a portion of the filter.

In the course of this movement, the grease filter is preferably moved so that it covers the lower opening of the hood in the mass in which it releases the extract during extension and insertion.

In the embodiment as in FIG. 3A shown, the grease filter 121 is designed foldable. The filter 121 folds up during insertion of the drawer 13, in which the folding axis moves upwards along the middle of the filter. At the front edge of the filter 121 is pivotally connected to the drawer 13. At the rear edge of the filter 121 is connected in just such a manner with the bottom plate of the hood part 12.

In the in FIG. 3B In the embodiment shown, the grease filter 121 moves as a rigid unit when inserting the drawer 13 upwards in the hood part 12 and in the exhaust duct 11. At the front edge of the filter 121 is in turn hinged to the drawer 13. The trailing edge of the filter 121 moves upwardly along a path that may be defined by guide rails 123, for example.

It should be understood that the above statements about the movement, design and attachment of the grease filter can generally also be applied to a frame in which the actual filter or its filter elements are releasably attached.

Likewise, elements of the examples shown above can also be combined. For example, the additional elements shown in the air duct, such as the grid 139, can be made FIG. 2B or 2C or the additional baffles 136-2 FIG. 2D , find application in all variants of the invention. It is therefore to be understood that the invention is not limited to the examples shown and may be practiced otherwise within the scope of the following claims.

Claims (12)

Extractor hood (10) with immovable exhaust duct (11) and hood part (12) with filter elements (121) and an extract (13), wherein the extract (13) from at least one for cleaning the extractor hood (10) separable and reusable insert part (133) which alone and / or in cooperation with a frame part (132) of the drawer (13) has a narrow air duct (138) between an air inlet gap (135) along the front end of the drawer (13) and the fixed hood part (12) ) and exhaust duct (11) and wherein the air duct (138) is substantially free of lateral openings, so that in operation air is sucked in substantially only through the air inlet gap (135) in the air duct (138). An extractor hood (10) according to claim 1, wherein the air duct (138) has a height of less than 50 mm. An extractor hood (10) according to claim 1, wherein the air duct (138) has a height of less than 30 mm. Extractor hood (10) according to one of claims 1 to 3, wherein the air inlet gap (135) to the air duct (138) is kept free of filter elements or grids. Extractor hood (10) according to one of claims 1 to 4, wherein in the air duct (138) a grease separator (136-2,139) is mounted. Extractor hood (10) according to claim 5, wherein the grease separator sieve or grid elements (139). An extractor hood (10) according to claim 6, wherein the screen or grid elements (139) along the air passage (138) at least once in contact with a ceiling part (136) and a bottom part (137) of the air duct (138). Extractor hood (10) according to claim 5, wherein the grease separator at least one in the air passage (138) projecting guide surface (139) which influences the direction of the air flow in the air duct (138). Extractor hood (10) according to one of claims 1 to 8, wherein the cleaning of the extractor hood (10) separable and reusable insert part (133) consists of dishwasher-safe material. An extractor hood (10) as claimed in claim 9, wherein ceiling and floor portions (136, 137) forming most of the inner boundary surfaces of the air duct (138) are integral with the insert portion (133). An extractor hood (10) according to any one of claims 1 to 10, comprising one or more filter elements (121) which are releasable for cleaning and which form a grease separator for covering a lower inlet opening of the hood part (12). An extractor hood (10) according to any one of claims 1 to 11, wherein the one or more filter elements (121) are movably mounted and coupled to the drawer (13) such that the one or more filter elements (121) upon insertion of the drawer (13). are moved upward in the direction of the withdrawal shaft (11).

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