EP0555676B1 - Hotte d'aspiration et procédé pour aspirer de la poussière ou de la vapeur - Google Patents

Hotte d'aspiration et procédé pour aspirer de la poussière ou de la vapeur Download PDF

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Publication number
EP0555676B1
EP0555676B1 EP93101026A EP93101026A EP0555676B1 EP 0555676 B1 EP0555676 B1 EP 0555676B1 EP 93101026 A EP93101026 A EP 93101026A EP 93101026 A EP93101026 A EP 93101026A EP 0555676 B1 EP0555676 B1 EP 0555676B1
Authority
EP
European Patent Office
Prior art keywords
hood
jet
wall
exhaust hood
blast
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP93101026A
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German (de)
English (en)
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EP0555676A1 (fr
Inventor
Hannelore Röhl-Hager
Georg Dr.-Ing. Habil. Koppenwallner
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.)
ROEHL HAGER HANNELORE
Original Assignee
ROEHL HAGER HANNELORE
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Publication of EP0555676A1 publication Critical patent/EP0555676A1/fr
Application granted granted Critical
Publication of EP0555676B1 publication Critical patent/EP0555676B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F24C15/2028—Removing cooking fumes using an air curtain

Definitions

  • the invention relates to an extractor hood according to the preamble of claim 1 and to a method according to the preamble of claim 9.
  • the problem with extractor hoods arises that the during operations, e.g. When cooking, the steam or vapor produced, which has only about half the air density, is greatly accelerated, so that the suction device installed above the work surface must suck in a vertically oriented turbulent free jet or a thermal upward flow.
  • speeds occur that significantly exceed the suction speed of the suction, a large part of the steam or haze breaks out into the environment.
  • blowing jets should either cover the rising steam from top to bottom as a fresh air curtain (e.g. DE-OSen 22 59 670, 19 63 456, 19 24 345, 16 04 293), or by the Blowing the front of the hood inwards either downwards or upwards to direct the steam to the rear suction surface (e.g. US Pat. Nos. 4,153,044, 4,127,106, 4,043,319, 3,513,766, DE-OS 25 31 862).
  • a fresh air curtain e.g. DE-OSen 22 59 670, 19 63 456, 19 24 345, 16 04 293
  • Blowing the front of the hood inwards either downwards or upwards to direct the steam to the rear suction surface
  • the disadvantages of the prior art are that the cooking area is restricted by side wall boundaries, that a high noise level has to be accepted at high blower output, and / or that the hood is only of limited effectiveness if steam escapes in front of the hood, e.g. when handling or with strong steam generation. The blow jet itself is disturbed so far that it remains ineffective over a long period of time.
  • a generic extractor hood is known from DE-OS 37 18 686, which has an additional fan with a blow-out nozzle arranged on the underside of the hood for generating a horizontal air flow, which entrains the air rising from the stove, containing odors and cooking vapor into the filter. Means for generating a helical flow cannot be derived from this.
  • DE-A-3 918 870 describes a method and a device for extracting vapors and vapors.
  • the object of the invention is to remedy these disadvantages and to concentrate the rising steam with the hoods open at the side, and the noise level of the blower by lowering it To reduce blower performance significantly and to hinder the wall blowing jet as little as possible by the rising steam.
  • a helical or helical vortex structure within the blowing jets used is highly inherently stable.
  • this type of flow can not only integrate the individual convective elements, but also reinforce itself.
  • the turbulent friction is lower in such a flow.
  • the individual counter-rotating vortex rollers can be connected via a respectively rotated by 90 o rolling eddy further, so that so that a U-shaped or horseshoe-shaped swirl is formed structure, which can correspond to the respective spatial conditions. This results in an additional stabilization of the connected vortex rollers.
  • a helical or helical flow is achieved in that the free blowing cross section of the nozzle has narrowing and widening across the cross section, for example in the form of a comb gap, through which the free blowing air is blown out from the front blowing nozzle to the rear suction device.
  • the elevations and depressions or corresponding elements of the comb gap are narrowed at regular or almost regular intervals.
  • the optimal case is that the width of the depressions is equal to the width of the elevations and the vortex diameter corresponds to the width of the depressions.
  • a roll vortex is created below the double nozzle, the direction of rotation of which in the sense of air deflection, e.g. runs clockwise. If the gap forming the horizontal jet is made wider than the gap forming the vertical jet within this double-gap nozzle, a horizontally extending jet, in particular a wall-blowing jet, is formed independently of the roll vortex below the nozzle.
  • a deflection or guiding device is used, which is designed, for example, in the form of two triangular plate-like elevations formed at the opposite corner points of the front of the extractor hood. The thickness of the plates is several times the gap thickness.
  • the acute angle of the right-angled triangle of the deflection devices is in the order of magnitude of the free jet angle.
  • the deflecting device directs the jet inwards on both sides and imparts edge vortices to the jet acting as a wall jet.
  • the flow configuration due to the helical flow, the roll vortex and the edge vortex can be used individually or in combination. If a hotplate is between two walls, e.g. in a kitchen unit of a large kitchen, a blow jet is combined with the roll vortex as a leading edge vortex, which limits the vapor outlet at the front. This vortex acts as a border vortex.
  • a corresponding comb-blowing nozzle with two lateral deflection devices generates a leading edge vortex and two lateral vertebrae, that is to say a circumferential border vortex, and inner vertebrae.
  • the wall-blowing jet can be oriented horizontally or somewhat inclined. It is delimited at the top by the extractor hood and has a helical structure consisting of several vortex rollers, each rotating against each other. The flow is particularly stable due to this helicity and the double U-vortex structure.
  • the extractor hood has two fans, one of which is intended for suction and the other for blowing, the ratio of suction volume flow to blowing volume flow being approximately 5: 1.
  • FIG. 1 shows four flows arranged in parallel next to one another and directed helically from right to left, each of which two adjacent flows have different directions of rotation; this basic illustration is shown in connection with a coordinate cross xyz.
  • the four parallel flows are designated 1, 2, 3 and 4.
  • the blowing nozzle 8 is shown in cross section.
  • the upper limit 9 of the blow nozzle is drawn in a meandering shape with depressions 10 and elevations 11 which merge into one another and alternate with one another.
  • the opposite limitation of the gap of the blowing nozzle 8 is designated 12.
  • the helical flow 2-4 is designed in the manner shown in FIG. 1.
  • the axis 13 of the respective vortices running parallel to one another lies in the direction of the axis 13 of the blowing jet or in the blowing direction.
  • the free blowing cross section of the nozzle is designated 14.
  • the depressions 10 have a width d s
  • the elevations 11 have a width d b (applies to the two-dimensional case as the optimum)
  • d w d s applies to the vortex diameter.
  • FIG. 4 shows an embodiment of the front section of the extractor hood with a double slit nozzle 15.
  • 16 denotes the front boundary wall of the extractor hood, 17 the top of the hood, 18 the boundary wall (together with 17) of the air duct, 19, 20 the bottom wall and 21 a deflection wall for the supply air flow to the double-gap nozzle 15.
  • the horizontal gap 22 of the nozzle 15 has between the bottom wall 20 and wall 23 running parallel thereto, a gap spacing s x , while the vertical gap 24 with the gap spacing s z is formed by the end face of the wall 23 and the inside of the front boundary wall 16.
  • Arrow 25 indicates the direction of the supply air
  • arrow 26 the direction of the wall jet
  • arrow 27 the exit direction of the air flow which forms the roll vortex 28.
  • the wall blowing jet 26 flows along the outer surface of the hood bottom wall 20 at an angle ⁇ backward to the suction surface, while the roll vortex 28 prevents the escape of haze and the air flow of the roll vortex introduces the rising haze in the direction of the wall jet into the latter.
  • the arrangement of the deflection device and the formation of the edge vortices when the air flow is detached from the deflection device is shown schematically in a top view in FIG. 5.
  • the vertical front wall 29 of the hood has deflection elements 30, 31 arranged at the two corners in the blowing direction, which are wedge-shaped and whose hypotenuses are directed obliquely inwards.
  • the wall-blowing jet 32 is deflected inward by the surfaces of the deflection elements 30 and 31 in the direction of the arrow 33, then detaches itself from the elements 30 and 31 and forms a left and a right edge vortex as the vortex jet 34.
  • the deflection elements 30, 31 are shown in more detail in FIGS. 6 and 7, FIG. 6 showing the top view and FIG.
  • FIG. 8 The formation of the leading edge vortex 37 and its influence on the flow rising from the steam source and removed by the suction device is shown in FIG. 8.
  • the suction is carried out with the help of the wall-blowing jet and the front edge vortex between two lateral boundaries, which are formed by the side vortex.
  • the extractor hood is indicated by 38 in a schematic, perspective representation.
  • 39, 40 represent the comb splitting tines and 41, 42 the deflection devices.
  • the helical flows 43, 44, 45, 46 run in the direction of the wall-blowing jet from the front of the hood 47 to the rear of the hood 48.
  • the helical vortices are indicated by arrows, two adjacent vortices each having a different direction of rotation.
  • the helical flows 43 to 46 are coupled to one another by crossflow vortices 49, so that the helical vortices 43 and 46 limit the lateral limitation of the vapor flow and the transverse vortices 49 limit the front side of the vapor flow.
  • FIG. 10 An embodiment of the extractor hood according to the invention is shown in section in FIG. 10 at 50.
  • the hood part housing 51 receives a radial fan 52 that one Extraction filter 53 is assigned to the bottom of the hood 50.
  • the second hood part housing 54 has a cross-flow fan 55, which supplies air flow in the direction of the arrow through the channel 56 to the blowing nozzle 57 at the front, lower hood end.
  • the inflow gap of this blowing nozzle with the gap distance S1 is designated 58, the wall-blowing jet gap with the gap distance S3 with 59 and the roll vortex gap with the gap distance S2 with 60.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Ventilation (AREA)

Claims (12)

  1. Hotte d'aspiration destinée à être utilisée au-dessus d'un lieu de cuisson, d'une source de poussière ou de vapeur, pourvue d'un ventilateur d'aspiration, d'un dispositif de filtrage, de conduites d'aération ainsi que d'un ventilateur supplémentaire présentant une tuyère de sortie disposée sur la face inférieure de la hotte et destinée à produire un jet de soufflage mural horizontal dirigé à partir du bord avant de la hotte vers la surface d'aspiration ou vers le filtre, aspirant le flux de vapeur et entraînant celui-ci vers la surface d'aspiration, caractérisée en ce que des dispositifs de soufflage (8, 10, 11, 12, 16-23; 30, 31; 41, 42; 60) sont prévus dans la zone de la tuyère de sortie (15; 57) qui, dans le jet de soufflage mural, produisent des tourbillons de courant hélicoidaux qui sont soufflés parallèlement les uns aux autres de façon rotative alternativement dans un sens ou dans le sens opposé en direction du jet de soufflage mural jusqu'au dispositif d'aspiration.
  2. Hotte d'aspiration selon la revendication 1, caractérisée en ce que le ventilateur supplémentaire (55) constitue un ventilateur à courant transversal situé à l'entrée d'un conduit de ventilation (56) à la sortie duquel est disposée la tuyère de sortie (57).
  3. Hotte d'aspiration selon l'une ou l'autre des revendications 1 ou 2, caractérisée en ce que la tuyère de sortie (57) sur le bord (59) avant inférieur de la hotte qui transforme l'air de soufflage en jet mural est conçue comme une fente dentée (8) qui produit des tourbillons de courant hélicoïdaux en direction du jet mural.
  4. Hotte d'aspiration selon la revendication 3, caractérisée en ce que la fente dentée (8) est conçue sur une face (10) plane et sur la surface (9) opposée constituant la fente telle un méandre (11, 12), la configuration en forme de méandre (11, 12) étant prévue sur la face inférieure du fond (20) de la hotte d'aspiration.
  5. Hotte d'aspiration selon l'une ou l'autre des revendications 1 à 4, caractérisée en ce que un dispositif (15; 57, 58, 60) destiné à créer un tourbillon en forme de rouleau (28) sur l'arête avant de la hotte d'aspiration est conçu comme une tuyère à fente jumelée (15; 57).
  6. Hotte d'aspiration selon la revendication 5, caractérisée en ce que la tuyère à fente jumelée présente une fente plus grande (S3) parallèlement au fond de la hotte d'aspiration et une fente plus petite (S2) perpendiculaire à cette direction et située dans le sens vertical.
  7. Hotte d'aspiration selon l'une ou l'autre des revendications 1 à 6, caractérisée en ce que un dispositif (41, 42) destiné à limiter le bord latéral du jet de soufflage mural est prévu, qui se compose de deux éléments de guidage (41, 42) situés l'un en face de l'autre sur les deux tuyères latérales, lesdits éléments pouvant être inclinés, sur les côtés tournés l'un vers l'autre, vers l'intérieur et situés vers l'arrière dans la hotte d'aspiration.
  8. Hotte d'aspiration selon l'une ou l'autre des revendications 3 et 5 ou selon une des revendications suivantes, caractérisée en ce que il est prévu que, dans la hotte d'aspiration, le courant hélicoïdal, en raison de la fente dentée (8), et le tourbillon en forme de rouleau soient combinés au jet mural en raison de la tuyère à fente jumelée (15; 57), le courant hélicoïdal sur base de la fente dentée (8), le tourbillon en forme de rouleau et le jet mural sur base de la tuyère à fente jumelée (15; 57) et le tourbillon marginal sur base du coudage (41, 42) étant combinés l'un à l'autre.
  9. Dispositif destiné à aspirer la poussière ou la vapeur au moyen d'une hotte d'aspiration disposée au-dessus d'un lieu de cuisson, d'une source de poussière ou de vapeur, dans le cas duquel l'air, au moyen d'un ventilateur d'aspiration, est conduit à travers une conduite d'aération à l'intérieur de la hotte jusqu'au bord avant inférieur de celle-ci, passant ensuite par une tuyère de sortie située à cet endroit tel un jet de soufflage mural sur le fond de la hotte jusqu'au dispositif d'aspiration, caractérisé en ce que dans la zone de la tuyère de sortie sont produits des tourbillons de courant hélicoïdaux qui sont soufflés parallèlement les uns aux autres de façon rotative alternativement dans un sens ou dans le sens opposé en direction du jet de soufflage mural jusqu'au dispositif d'aspiration.
  10. Dispositif selon la revendication 9, caractérisé en ce que deux tourbillons de courant hélicoïdaux voisins sont combinés sur le bord avant inférieur de la hotte par l'intermédiaire d'un courant tourbillonnaire transversal en un tourbillon de courant en forme de U, plus particulièrement en forme de fer à cheval.
  11. Dispositif selon l'une ou l'autre des revendications 9 et 10, caractérisé en ce que, sur le bord avant inférieur de la hotte, sont produits par la tuyère de sortie des tourbillons en forme de rouleaux, plus particulièrement des tourbillons de l'arête avant, dirigés vers le bas et vers l'intérieur sur toute la largeur de la hotte.
  12. Dispositif selon l'une ou l'autre des revendications 9, 10 et 11, caractérisé en ce que sont produits, sous la face latérale de la hotte, des tourbillons latéraux qui limitent les autres tourbillons existant à l'intérieur, en ce que lesdits tourbillons latéraux sont produits par le fait que le jet de soufflage mural sur l'extrémité avant inférieure de la hotte est incliné vers l'intérieur sur une courte distance, et en ce que les tourbillons latéraux sont formés par le détachement de l'écoulement d'air de ces conduites.
EP93101026A 1992-02-11 1993-01-23 Hotte d'aspiration et procédé pour aspirer de la poussière ou de la vapeur Expired - Lifetime EP0555676B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4203916 1992-02-11
DE4203916A DE4203916C1 (fr) 1992-02-11 1992-02-11

Publications (2)

Publication Number Publication Date
EP0555676A1 EP0555676A1 (fr) 1993-08-18
EP0555676B1 true EP0555676B1 (fr) 1996-07-10

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EP93101026A Expired - Lifetime EP0555676B1 (fr) 1992-02-11 1993-01-23 Hotte d'aspiration et procédé pour aspirer de la poussière ou de la vapeur

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EP (1) EP0555676B1 (fr)
DE (2) DE4203916C1 (fr)
ES (1) ES2092143T3 (fr)

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DE19613513A1 (de) * 1996-04-04 1997-10-09 Roehl Hager Hannelore Verfahren zum Eingrenzen, Erfassen und Absaugen von Dunst, Staub oder dergleichen sowie Einrichtung zur Durchführung des Verfahrens
DE19911850B4 (de) * 1999-03-17 2010-04-08 Röhl-Hager, Hannelore Verfahren und Vorrichtung zum Eingrenzen, Erfassen und Absaugen von Schadstoffen, insbesondere bei Dunstabzugshauben
WO2001044724A1 (fr) 1999-12-14 2001-06-21 Georg Emanuel Koppenwallner Procede et dispositif pour separer et aspirer des fluides au moyen de generateurs de turbulences frontales
DE10015666A1 (de) * 1999-12-14 2001-06-28 Georg Emanuel Koppenwallner Verfahren und Einrichtung zum Erfassen, Trennen und Absaugen von fluiden Medien unter Verwendung von Frontalwirbelgeneratoren
DE10039881A1 (de) * 2000-08-16 2002-03-07 Electrolux Ag Zuerich Dunstabzugshaube
EP1778418B2 (fr) 2004-07-23 2013-11-06 OY Halton Group, Ltd. Regulation amelioree de systemes d'echappement
KR100595573B1 (ko) * 2004-09-20 2006-07-03 엘지전자 주식회사 주방용 배기장치
KR100644837B1 (ko) * 2004-11-10 2006-11-10 엘지전자 주식회사 배기후드
KR100608704B1 (ko) * 2004-12-20 2006-08-08 엘지전자 주식회사 주방용 후드의 월제트 배기장치
DE102005019118A1 (de) * 2005-04-25 2006-10-26 BSH Bosch und Siemens Hausgeräte GmbH Dunstabzugshaube
KR100664068B1 (ko) * 2005-08-22 2007-01-03 엘지전자 주식회사 배기 후드
US20080274683A1 (en) 2007-05-04 2008-11-06 Current Energy Controls, Lp Autonomous Ventilation System
ITMC20070118A1 (it) * 2007-06-06 2008-12-07 Veljko Martic Cappa aspirante per cucine di innovativa concezione.
US20090061752A1 (en) 2007-08-28 2009-03-05 Current Energy Controls, Lp Autonomous Ventilation System
WO2009129539A1 (fr) 2008-04-18 2009-10-22 Oy Halton Group, Ltd. Appareil d’échappement, système et procédé pour capture et confinement améliorés
SG171458A1 (en) 2008-12-03 2011-07-28 Halton Group Ltd Oy Exhaust flow control system and method
DE102012012551A1 (de) * 2012-06-23 2013-12-24 Heinrich Wagener Lüftungsanordnung mit einer Dunstabzugshaube
WO2017012630A1 (fr) * 2015-07-23 2017-01-26 Diehl Ako Stiftung & Co. Kg Hotte aspirante et procédé pour faire fonctionner une hotte aspirante

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DE3918870C2 (de) * 1989-06-09 1995-06-29 Roehl Hager Hannelore Verfahren und Einrichtung zum Absaugen von Dämpfen und Dunststoffen

Also Published As

Publication number Publication date
ES2092143T3 (es) 1996-11-16
EP0555676A1 (fr) 1993-08-18
DE4203916C1 (fr) 1993-04-29
DE59303165D1 (de) 1996-08-14

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