EP3045823B1 - Hotte aspirante - Google Patents

Hotte aspirante Download PDF

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Publication number
EP3045823B1
EP3045823B1 EP16150911.2A EP16150911A EP3045823B1 EP 3045823 B1 EP3045823 B1 EP 3045823B1 EP 16150911 A EP16150911 A EP 16150911A EP 3045823 B1 EP3045823 B1 EP 3045823B1
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EP
European Patent Office
Prior art keywords
exhaust air
extractor hood
deposition units
deposition
hood according
Prior art date
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Active
Application number
EP16150911.2A
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German (de)
English (en)
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EP3045823A1 (fr
Inventor
Berthold Scholz
Andreas Howest
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.)
Berbel Ablufttechnik GmbH
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Berbel Ablufttechnik GmbH
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Publication of EP3045823A1 publication Critical patent/EP3045823A1/fr
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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

Definitions

  • the invention relates to an extractor hood.
  • extractor hoods In order to remove exhaust air and odors especially from kitchens, extractor hoods are used, so that the cooking fumes and the associated odors resulting therefrom can be dissipated.
  • Such extractor hoods generally have a separator for separating solid and liquid components of the exhaust air and a blower device for generating an air flow.
  • the deposition of the dirt particles can be effected by means of separation elements, such as, for example, washable grease filters or else by a suitable guidance of the air flow.
  • the separation device removes almost all the solid and liquid components contained in the exhaust air, such as grease droplets, dirt particles and condensed water, before the exhaust air enters the blower device.
  • Such extractor hoods can be divided into two categories.
  • the exhaust air is led out of an exhaust outlet of the extractor hood via a pipe or hose line to the outside and thus removed from the room in which the hob and the extractor hood are located.
  • the exhaust air contaminated with odors is released to the atmosphere outside the building.
  • the abovementioned separating device is provided in the exhaust hoods to keep all subsequently arranged exhaust ducts clean and the blower device functional. With this category of extractor hoods odor nuisance and dirt deposits in the cooking area and in the building as a whole can be avoided. However, the removal of warm air from a room leads to an increased energy demand, since the fresh air, which replaces the extracted exhaust air, must be reheated.
  • the exhaust air is returned to the room.
  • a carbon filter is provided, which must either be exchanged at certain intervals or regenerated. Of the Replacement of the carbon filter must be done the faster, the more fat in the exhaust air after the separator is still included. It is therefore desirable to achieve the highest possible degree of grease separation.
  • an insert in the form of a flat cuboid is provided, the large side surfaces are constructed of perforated plate.
  • the exhaust air is guided past these side surfaces, so that the small fat droplets still contained capillary forces are removed from the exhaust air stream and can collect on the perforated plates of the insert.
  • the WO 2013/183005 A1 describes an inertial filter for filtering out solids contained in a fluid and a method of manufacturing such an inertial filter.
  • the filter 10 includes a pair of opposed baffle plates that include a first baffle plate 12 and a second baffle plate 14 that are disposed in opposing and abutting relationship in substantially parallel planes.
  • Each baffle plate 12, 14 is in the form of a layer grid and includes a first inner filter element 16 and a second outer filter element 18.
  • the EP 2 287 534 A1 describes a flame arrester oil filter in, for example, a kitchen hood.
  • the filter comprises at least two substantially parallel spaced refractory plates.
  • the plates have perforated zones and define at least one channel therebetween, the channel having a portion having a direction opposite to that of the gas flow.
  • the CN 2 867 160 Y describes an oil smoke separation screen for an exhaust smoke fan which is part of an air purification device, in particular an oil smoke separation screen used in kitchens.
  • the Abscheidehold is conical and has an outer surface with through holes and an inner surface with through and blind holes. At the bottom of the Abscheidetoxins a cup for oil is arranged. The outer and inner surfaces form tortuous air ducts, so that the gas flow is swirled and oil particles are separated and collected in the cup.
  • the US 5,679,120 describes a grease filter for separating oil particles with high efficiency despite the use of a low-power fan.
  • the filter has a frame carrying a plurality of baffles spaced apart in rows. Each baffle is V-shaped and has first and second walls forming an acute angle.
  • the acute angles are oppositely disposed to align the first and second walls thereby forming entrance passages between the first walls of adjacent baffles and exit passages between the second walls thereof.
  • the baffles are configured such that the entrance passages have a width that is narrower towards an exit end of the entrance passage than an entrance end of the entrance passage, and that the exit passage has a width that is greater than the width of the entrance passage at its exit end.
  • the NL 1 014 251 C2 describes a filter element for removing grease or paint particles contained in the air.
  • the filter element comprises a ceiling track and a floor track. Air flow channels are formed between the folded ceiling and floor panels which are divided into alternating strips and have rows of inlet and outlet openings disposed on opposite sides of the air flow channels.
  • the top and bottom panels each have top and bottom fold lines that provide zig-zag folding and that form lambda-shaped and elongated flow channels that have a generally zigzag cross-section.
  • the inlet openings formed in bottom track sections are disposed in a bottom channel wall region, and the outlet openings are formed in ceiling track sections, in a ceiling channel wall region located on the other side of a channel axis of symmetry.
  • the DE 10 2008 047595 A1 describes an extractor hood for extracting exhaust air and separating droplets of fat from exhaust air, comprising an exhaust air inlet, a fan for generating an exhaust air stream and an exhaust air outlet, wherein the exhaust air inlet has an exhaust air duct for a first separation of fat droplets from the exhaust air stream and the exhaust air duct is designed Redirect exhaust air stream progressively, such that in the exhaust air stream contained fat droplets that exceed a certain mass, are deposited due to their inertia on a wall of the exhaust duct, and a second separation of fat droplets from the exhaust air flow in the form of a baffle element.
  • the invention has for its object to further improve a cooker hood and further increase the degree of separation of liquid fat in particular.
  • V-shaped is meant an angular formation of the deposition units, without wishing to fix the formation at a certain angle.
  • the deposition units have a kink along their central longitudinal axis.
  • the partial streams are passed between the deposition units, they are deflected in accordance with the V-shaped configuration of the deposition units. This creates turbulence, which leads to an intimate mixing. However, a remarkable increase in the flow resistance does not result from this measure. Due to the turbulence very small fat droplets, which are still in the exhaust air, meet and store themselves in larger units together. These larger units can be much easier deposited due to the greater inertia in a change in direction of the exhaust gas flow.
  • the deposition units therefore have particularly advantageous perforated plates.
  • Through the openings of the perforated plates only a small part of the exhaust air is forced through, but this is sufficient to disrupt the build-up of a laminar flow at the rear of the depositing unit and to provide further turbulence. But the openings of the perforated plates also develop capillary forces, which cause larger fat droplets are deposited from the passing exhaust air and settle in the openings.
  • the perforated plates are preferably made of stainless steel, so that even fatty acids and other aggressive components of the exhaust air can do no harm.
  • the area ratio of the perforated plates from open to closed areas is greater than 50%. In this way, there are enough areas for the separation of fat droplets available. If the above-mentioned area ratio remains below 55%, it is also ensured that the deposition units have sufficient stability without the need for elaborate supports.
  • the holes in the perforated plates should have a size at which the highest possible capillary forces develop, but in which the holes nevertheless do not clog up quickly. It has been found that the holes of the perforated plates should have a diameter between 1 and 5 mm. This leads to a good separation behavior, but also ensures that liquid fat runs out of the holes before it solidifies. Perforated sheets having a hole diameter of 3 mm have proven particularly suitable.
  • the angle at which the partial flows of the exhaust air are deflected should be designed so that as many turbulences as possible are formed without the flow resistance being increased too much. At an acute angle below 90 °, a congestion zone would form in which increasingly exhaust air passes through the holes of the deposition units, but would also increase the flow resistance.
  • the angle of the V-shaped formation of the deposition units is therefore between 95 and 130 °.
  • a separation module which has a symmetrical arrangement of deposition units, wherein the vertexes of the V-shaped deposition units are directed towards the center.
  • This separation module can be flown on from two sides. In this case, turbulences also form in the middle of the arrangement, since here two partial flows meet one another.
  • the inner deposition units of the assembly have at their apexes a distance which is large enough to form a passage for the two juxtaposed partial flows.
  • the deposition units will become soiled over time so that they lose their full functionality.
  • the separation module must be cleaned.
  • the separation module therefore advantageously has two opposite side parts, between which the deposition units are anchored. In this way, an independent module is formed, which can be removed from the hood and cleaned.
  • a cleaning step with the deposition units according to the invention is primarily intended to separate very small droplets of fat from the exhaust air.
  • this purification stage is not sufficient. It is therefore provided at least one pre-cleaning stage in which particles are pressed by a progressive deflection of the exhaust air flow to the outside and deposited on the wall of an exhaust air duct. This pre-cleaning stage detects all fat droplets that exceed a certain mass, so that after the pre-cleaning only a few fat droplets with very low mass are contained in the exhaust air stream.
  • the exhaust air should be deducted both at the front and on the opposite back.
  • two opposite exhaust air inlets can be provided.
  • the exhaust air from each exhaust air inlet is subjected to a pre-cleaning in a separate pre-purification stage, in which already the larger fat droplets are deposited.
  • at the bottom of the cleaning stage opens on two sides depending on an exhaust air duct from a pre-cleaning stage. In this way, the two exhaust air streams are largely still treated separately, but they influence each other so far that each of the two exhaust air streams contributes to a better turbulence of the other exhaust gas flow.
  • the fat droplets which are deposited on the deposition units from the exhaust air either drop directly from these or run down to the lower edge of the respective deposition unit and drip off therefrom.
  • This dripping fat has to be collected. It is therefore provided a lower shell, which connects the two exhaust air ducts with each other, wherein the lower shell and the exhaust air ducts are arranged so that collected at the Abscheidemodulen and collected by these dripping liquids and collected.
  • the at least one cleaning opening particularly advantageously has a flap with which the cleaning opening can be closed.
  • the flap can be opened so that the separated liquids from the lower shell and the exhaust air ducts can be wiped out.
  • Deposition module 1 shown has two side parts 2, which are interconnected via tie rods 3. On the inner sides of the side parts 2 holders 6 are mounted, between which the deposition units 7 are inserted.
  • the deposition units 7 consist of a rectangular perforated plate, which is bent about a central longitudinal axis. The angle between the two legs is 105 °.
  • the respective free edges are provided with an envelope 8. In addition to improving stability, but also increases security because sharp edges are avoided by which a person could injure when removing the separation module 1.
  • three parallel-aligned deposition units are arranged so that their vertices are directed towards the center of the side parts 2 and the deposition units 7 have the shape of two oppositely directed triple arrows in cross-section.
  • Each side part 2 additionally has an opening formed as a handle 5, on which the separating module 1 can be gripped for removal from the extractor hood.
  • the separation module 1 is held by two leaf springs 4 attached to the side parts 2, which can be released by actuating the unlocking device 9. A removal of the separation module 1 for cleaning purposes is readily possible.
  • the deposition units 7 are made of a perforated plate 10, as it is as a cutout in Fig. 4 is shown.
  • the holes 11 have a diameter of 3 mm, the distance between the centers of two holes is 4 mm in each case, so that the centers of three adjacent holes each form an equilateral triangle with a side length of 4 mm. In this way, the area ratio of the holes to the closed areas is 51.02%.
  • This perforated plate has proved to be particularly advantageous for use in the separation module 1. Without forming a large flow resistance, the guiding function is nevertheless sufficient to achieve the intended purpose.
  • Fig. 3 shows the basic structure of an extractor hood according to the invention with the housing 19.
  • the exhaust air is sucked through the two slit-shaped exhaust air inlets 18 of the extractor hood.
  • the reference numeral 20 denotes a flap or cover which can be opened for cleaning purposes. In this way, the separated liquid and solid components can be very easily wipe out of the exhaust air ducts 13.
  • the exhaust air From the exhaust air ducts 13 with the pre-purification stages, the exhaust air enters the separation module 1, in which the post-purification is carried out. This process will be explained in detail later. Via the outflow channels 15, the exhaust air now freed from virtually all solid and liquid components leaves the separation module 1 and reaches the blower 14. From here, the exhaust air is still forced through the carbon filter 16. The aromatic components of the exhaust air, such as. B. odors adsorbed and thus removed from the exhaust air. The cleaned exhaust air is then released through the exhaust outlet back to the room air.
  • the speed of the exhaust air stream slows down.
  • the exhaust air flow is divided by the deposition units 7 into four partial streams.
  • the remaining partial streams flow at least initially along the parallel aligned entry legs of the deposition units 7 of the separation module 1. This relatively laminar flow continues up to the apex of the deposition units 7. Here, the partial streams are now deflected by the exit legs of the deposition units 7. In this case, turbulences are again generated, which in turn lead to the aggregation of small particles and the frequent impact of particles on the deposition units 7.
  • the respectively central V-shaped deposition unit has a larger angle than the two adjacent deposition units. This means that the partial channel between the inner and the middle deposition unit expands to the apex, while the partial channel between the middle and the outer deposition unit tapers accordingly. As a result, the pressure in the one partial channel rises to the apex and drops off in the adjacent partial channel. These differences in pressure mean that even before the apex, certain proportions of the partial streams pass through the holes of the deposition units and cause turbulence.
  • each partial flow will not participate in the deflection, but pass through the holes 11 of the deposition unit 7 in the impact area.
  • the turbulences in the respective adjacent partial flow are intensified.
  • the particles stored together are thrown outward by the vortices and deposited on the deposition units 7.
  • the next deflection of the partial flows takes place during the outflow of partial streams from the separation module 1 in the outflow channels 15 through the upper boundary. Again, the particles stored together can not participate in the deflection due to their increased mass and settle on the upper wall of the discharge channels 15.
  • the liquid components drip onto the deposition units 7, together with the deposits present there form larger drops or a film, and run down on the deposition units 7. From the lower edges of the deposition units 7, they finally drip into the lower shell 12 or the exhaust air ducts 13.
  • By opening the cleaning flap 20 (FIG. Fig. 3 ), they can be easily removed from the hood, z. B. be wiped.
  • the size of the holes 11 and the distance between the holes of the deposition units 7 are selected so that the holes 11 do not become clogged with deposited particles. But it is also ensured that the adhesion forces are large enough to hold particles which come into contact with the deposition units 7, regardless of whether they are solid or liquid particles.
  • the entrance and the exit legs of the deposition units 7 meet at their vertices at an angle of 105 ° to each other. This angle is chosen so that turbulence is formed during the deflection of the partial streams. Likewise, however, particles deposited together near the vertex are deposited at the exit legs, since they can not participate in the strong deflection of the partial streams.
  • the angle is also chosen so that the flow resistance remains low.
  • compared with fat filters used in other extractor hoods here results in a much lower flow resistance. This leads to a lower volume of the hood and to an increased suction power, without the need for a stronger blower. In this way, an energy saving can be achieved.
  • the principle of the post-cleaning shown in the embodiment shown is of course not only applicable to circulating hoods.
  • the cleaning stage with the separation module 1 can also be used in exhaust hoods.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Separating Particles In Gases By Inertia (AREA)

Claims (11)

  1. Hotte aspirante pour aspirer l'air sortant et extraire des gouttelettes de graisse de l'air sortant, comprenant
    au moins une admission d'air sortant (18), un ventilateur (14) pour produire un courant d'air sortant, et au moins une sortie d'air sortant (17),
    dans laquelle la au moins une admission d'air sortant (18) présente un canal de guidage de l'air sortant (13) pour une première extraction de gouttelettes de graisse du courant d'air sortant et le canal de guidage de l'air sortant (13) est configuré pour changer progressivement de direction le courant d'air sortant, de manière telle que des gouttelettes de graisse contenues dans le courant d'air sortant, qui dépassent une certaine masse, sont extraites en raison de leur inertie de masse sur une paroi du canal de guidage de l'air sortant (13);
    caractérisée en ce que la hotte aspirante comprend, en outre,
    une pluralité d'unités de dépôt (7) pour une deuxième extraction de gouttelettes de graisse du courant d'air sortant,
    dans laquelle chaque unité de dépôt (7) de la pluralité d'unités de dépôt (7) est conçue en forme de V et la pluralité d'unités de dépôt (7) est disposée de manière telle que le courant d'air sortant est divisé en plusieurs courants partiels et est conduit entre les unités de dépôt (7), et par la configuration en forme de V des unités de dépôt (7) se forment des tourbillons dans les courants partiels qui entraînent une conglomération des gouttelettes de graisse encore contenues dans le courant d'air sortant.
  2. Hotte aspirante selon la revendication 1, dans laquelle les unités de dépôt (7) présentent à chaque fois des tôles perforées (10).
  3. Hotte aspirante selon la revendication 2, dans laquelle le rapport de surface des tôles perforées (10) des zones ouvertes aux zones fermées est supérieur à 50 %.
  4. Hotte aspirante selon l'une des revendications 1 à 3, dans laquelle les trous (11) des tôles perforées (10) présentent un diamètre entre 1 et 5 mm.
  5. Hotte aspirante selon l'une des revendications 1 à 4, dans laquelle l'angle de la configuration en forme de V des unités de dépôt (7) se situe entre 95 et 130°.
  6. Hotte aspirante selon l'une des revendications 1 à 5, dans laquelle les unités de dépôt (7) sont conçues comme un module d'extraction (1) qui présente une disposition symétrique des unités de dépôt (7) et dans laquelle les sommets des unités de dépôt en forme de V (7) sont dirigés à chaque fois vers le milieu de la hotte aspirante.
  7. Hotte aspirante selon la revendication 6, dans laquelle le module d'extraction (1) présente deux parties latérales opposées (2), entre lesquelles sont ancrées les unités de dépôt (7).
  8. Hotte aspirante selon la revendication 7, dans laquelle sont prévus sur les parties latérales (2) des ressorts à lames (4) qui interagissent avec des contre-pièces correspondantes de la hotte aspirante.
  9. Hotte aspirante selon la revendication 1, dans laquelle la hotte aspirante présente deux admissions d'air sortant (18) et chaque admission d'air sortant (18) un canal de guidage de l'air sortant (13).
  10. Hotte aspirante selon la revendication 9, dans laquelle la hotte aspirante présente une coque inférieure (12), qui relie ensemble les deux canaux de guidage de l'air sortant (13) et la coque inférieure (12) et les canaux de guidage de l'air sortant (13) sont disposés de manière telle que sur les unités de dépôt (7) sont interceptées et collectées des gouttelettes de graisse extraites et s'égouttant de celles-ci.
  11. Hotte aspirante selon la revendication 10, dans laquelle au moins une ouverture de nettoyage est prévue pour la coque inférieure (12) et les canaux de guidage de l'air sortant (13).
EP16150911.2A 2015-01-16 2016-01-12 Hotte aspirante Active EP3045823B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102015200641.7A DE102015200641A1 (de) 2015-01-16 2015-01-16 Dunstabzugshaube

Publications (2)

Publication Number Publication Date
EP3045823A1 EP3045823A1 (fr) 2016-07-20
EP3045823B1 true EP3045823B1 (fr) 2017-12-27

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP16150911.2A Active EP3045823B1 (fr) 2015-01-16 2016-01-12 Hotte aspirante

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EP (1) EP3045823B1 (fr)
DE (1) DE102015200641A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108253489B (zh) * 2018-03-07 2023-01-03 佛山市云米电器科技有限公司 一种具有多重油烟分离功能的吸油烟机

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008047595A1 (de) * 2008-09-17 2010-03-25 Berbel Ablufttechnik Gmbh Dunstabzugshaube

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5679120A (en) * 1995-08-15 1997-10-21 Kuraco Limited Grease filter
NL1014251C2 (nl) * 2000-02-01 2001-08-02 Holdingmij Rupofil B V Filterelement.
CN2867160Y (zh) * 2005-09-23 2007-02-07 成都艾玛工业设计有限公司 抽油烟机油烟分离罩
EP2287534B1 (fr) * 2009-08-20 2017-04-19 Grease Capture Inc. Filtre à graisse pare-flammes
WO2013183005A1 (fr) * 2012-06-08 2013-12-12 Oosthuizen Petrus Marthinus Filtre à inertie

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008047595A1 (de) * 2008-09-17 2010-03-25 Berbel Ablufttechnik Gmbh Dunstabzugshaube

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Publication number Publication date
EP3045823A1 (fr) 2016-07-20
DE102015200641A1 (de) 2016-07-21

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