EP2979037A1 - Hotte aspirante - Google Patents

Hotte aspirante

Info

Publication number
EP2979037A1
EP2979037A1 EP14703803.8A EP14703803A EP2979037A1 EP 2979037 A1 EP2979037 A1 EP 2979037A1 EP 14703803 A EP14703803 A EP 14703803A EP 2979037 A1 EP2979037 A1 EP 2979037A1
Authority
EP
European Patent Office
Prior art keywords
chamber
air
suction
detection hood
detection
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.)
Granted
Application number
EP14703803.8A
Other languages
German (de)
English (en)
Other versions
EP2979037B1 (fr
Inventor
Sven Rentschler
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.)
Rentschler Reven GmbH
Original Assignee
Rentschler Reven 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 Rentschler Reven GmbH filed Critical Rentschler Reven GmbH
Publication of EP2979037A1 publication Critical patent/EP2979037A1/fr
Application granted granted Critical
Publication of EP2979037B1 publication Critical patent/EP2979037B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • 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
    • 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
    • F24C15/2042—Devices for removing cooking fumes structurally associated with a cooking range e.g. downdraft

Definitions

  • the present invention relates to a detection hood for detecting the exhaust air above cooking zones, production facilities and the like, comprising a fume chamber, a suction chamber and an air supply chamber, which extend horizontally and parallel to each other in a longitudinal direction, the fume chamber is open at the bottom and upwards tapered, the suction chamber is separated by a filter or a separator of the vapor chamber, wherein the filter or the separator forms an inclined boundary of the upwardly tapered vapor chamber, and
  • the air supply chamber tapers downwards and merges at its lower end into a curved deflection region which opens into an exhaust opening which is arranged at the lower end of the vapor chamber opposite the suction chamber so that a supply air which is blown from above into the air supply chamber from the exhaust opening horizontally or obliquely upwards in the direction of the filter or the separator emerges.
  • a detection hood of this type is substantially more efficient at detecting exhaust air rising from a cooking station or production facility than detection hoods of simpler design which have only exhaust ventilation.
  • a preferred field of use relates to commercial kitchens, cooking in this context may be any kitchen equipment in which a detection of the exhaust air is required or desirable, ie stoves, grills, roasters, fryers, etc.
  • the exhaust air to be detected contains here above all water vapor, Oil and fat.
  • the use of such detection hoods is not limited to hotplates, they can, for. B. also at Pro production processes of any kind for detecting exhaust air are used, especially in the food industry or in industrial production.
  • the operating principle of the generic detection hoods is based on the general problem that the range of the suction effect of a suction chamber is relatively limited, so that in detection hoods that work exclusively by suction, always a relatively large proportion of the detected in the extract chamber exhaust air to the suction chamber and the Pass filter or separator and is not sucked off immediately.
  • the thus detected exhaust air lingers in the fume chamber for a very long time and rotates within it in a flow roll until it is caught by the suction chamber and sucked out. Therefore, with the aid of the air supply chamber, a directed air flow is generated, which runs from the exhaust opening to the filter or separator and thereby traverses the vapor chamber, in which the rising exhaust air collects. This air flow captures the exhaust air, so that it flows very effectively through the filter or the separator in the suction chamber and there can be sucked faster than in a conventional detection hood without air supply chamber.
  • the detection hood further includes a vacuum chamber which is disposed between the vapor chamber and the air supply chamber, the vacuum chamber is closed on all sides except for a suction opening at its lower end, in the area the inner radius of the curved deflection region of the air supply chamber opens into the latter, and wherein the vacuum chamber and the air supply chamber are separated from each other by a wall which has a plurality of individual openings along an induction region which adjoins the suction opening or the deflection region, which are arranged consecutively in the longitudinal direction of the detection hood.
  • the mode of operation of the invention is based on the following phenomenon:
  • the supply air which flows through the air supply chamber from top to bottom, is accelerated by the tapered structure and passes through the wall of the induction region with a relatively high flow velocity.
  • the slope of the exiting air flow with the same geometry of the air supply chamber and the deflection can be increased by about 10 ° to 15 ° by the invention, which already leads to a significant increase in the efficiency of the detection hood, if thereby the flow direction receives additional upward component.
  • the width of the suction opening is favorably 20% to 50% of the width of the exhaust opening.
  • the width in each case means the opening width perpendicular to the longitudinal direction of the detection hood, with both the blow-off opening and the suction opening extending in a slot-shaped manner along this longitudinal direction.
  • the information on the geometry of the detection hood refers to a consideration in cross section, unless explicitly stated otherwise.
  • the absolute width of the openings is of course dependent on the dimensions of the detection hood, wherein in a typical embodiment, the exhaust opening z. B. may have a width of about 5 cm, the width of the suction opening would then be correspondingly in the range of about 1 to 2.5 cm.
  • the wall between the air supply chamber and the vacuum chamber in the induction region is preferably oriented substantially vertically. This also applies to the opposite wall of the air supply chamber, which merges further down into the outer radius of the curved deflection region. Thus, the supply air enters vertically down into the deflection.
  • the induction area may be followed by a wall which forms an inclined boundary of the downwardly tapering air supply chamber.
  • the tapering region then ends immediately before the induction region, so that there the maximum flow rate of the supply air is reached.
  • the inclined boundary wall of the air supply chamber separates them from the vacuum chamber, which is arranged between the air supply chamber and the vapor chamber.
  • the individual breakthroughs in the induction region i. E. in the wall between the vacuum chamber and the air supply chamber in this area, may have different shapes, wherein the openings should be optimized in terms of the induction of a negative pressure by the incoming air flowing past.
  • the breakthroughs may in particular have a diameter of 10 to 20 mm.
  • a flow acceleration element is arranged in the air supply chamber above the induction region, which is oriented substantially perpendicular to the flow direction of the incoming air and has a multiplicity of openings.
  • the flow cross section of the air supply chamber is reduced and the flow velocity in the subsequent induction region is increased, whereby the induction of a negative pressure in the vacuum chamber is more effective.
  • the shape of the openings in the flow acceleration element can in principle be selected relatively freely, with round openings being provided in the simplest case.
  • a perforated plate can be used as the flow acceleration element.
  • the Strömungsbeatungselement is oriented substantially perpendicular to the wall in the induction region. Typically, therefore, the Strömungsbeatungselement is horizontal and the wall in the induction region arranged vertically.
  • the curved deflection region in the region of its outer radius has a rounded wall which ends at the discharge opening with a gradient which is at least as great as the desired gradient of the air flow emerging from the discharge opening.
  • the detection hood preferably further comprises a supply air blower, through which the supply air can be injected from above into the air supply chamber.
  • the supply air blower can be arranged at the upper end of the air supply chamber or further connected upstream via a corresponding supply line. It is also conceivable that in larger systems several detection hoods are supplied by a supply air blower.
  • the supply air injected into the air supply chamber is supplied from outside the room in which the detection hood is installed.
  • this is not tempered outside air, as this is energetically cheaper than to use the heated or cooled depending on the season room air, which is indeed at least partially removed via the suction and discharged to the outside.
  • a throttle valve may be arranged in order to limit the amount of supplied air can. Such a limitation can be carried out according to the respective required suction of the detection hood.
  • the detection hood further comprises a suction fan, through which the exhaust air can be sucked from above from the suction chamber.
  • the extracted exhaust air can be discharged to the environment as a rule, since oils and fats, which are typically contained in the form of fine droplets in the exhaust air, and possibly solid particles were largely removed by the filter or the separator.
  • the term "filter” refers to materials with a rather fine-pored structure (eg metal mesh or steel wool), while as a separator, elements with a defined geometry enable targeted separation of oil and fat droplets from the exhaust air flow. Suitable filters and separators for detection hoods are known from the prior art.
  • the fume chamber is open down to the hob and tapers upwards.
  • the boundary of the vapor chamber can be in cross-section in particular substantially triangular or trapezoidal.
  • At the upper, closed end of the vapor chamber can be provided in particular in a trapezoidal shape, a lighting device.
  • the limitation of the vapor chamber to the suction chamber is formed by the filter or the separator.
  • the filter or the separator is inclined at an angle of 40 ° to 70 ° relative to the horizontal.
  • the filter or separator opposite inclined boundary of the vapor chamber is preferably formed by a wall which separates the vapor chamber from the vacuum chamber.
  • This wall may in particular, as well as most other constituents of the detection hood, be formed from a stainless steel sheet.
  • the wall between the vapor chamber and the vacuum chamber comprises an upper portion with a greater inclination and a lower portion with a smaller inclination, the latter substantially corresponding to the desired slope of the airflow exiting the exhaust port.
  • This wall section thus serves as a guide element for the exiting air flow.
  • the lower portion of the wall is inclined at an angle of 15 ° to 30 ° relative to the horizontal.
  • the upper portion of the wall between the vapor chamber and the vacuum chamber (when divided into two sections) or the wall as a whole (with a uniform inclination) is conveniently inclined at an angle of 40 ° to 70 ° relative to the horizontal, that is according to the preferred inclination of the filter or separator. Due to this steeper angle compared to the lower portion of the wall (if provided such is), the vapor chamber is increased and the vacuum chamber is reduced, which is advantageous in the rule.
  • Figure 1 A perspective view of a detection hood according to the invention
  • FIG. 2 shows a cross-sectional view of the detection hood according to FIG. 1;
  • FIG. 3 shows a perspective view of a part of the detection hood according to FIG. 1.
  • FIG. 1 shows a perspective view of an embodiment of a detection hood according to the invention, which is designated as a whole with 10.
  • the detection hood 10 extends in a longitudinal direction which extends approximately perpendicular to the plane of the drawing. For clarity, only a portion of the detection hood 10 is shown in FIG.
  • the detection hood 10 comprises a centrally located vapor chamber 12, which is open at the bottom and tapers upwards. On both sides of the vapor chamber 12, a suction chamber 14 and an air supply chamber 16 are arranged, wherein the suction chamber 14 is separated by a separator 18 of the vapor chamber 12 and between the vapor chamber 12 and the air supply chamber 16, a vacuum chamber 20 is arranged.
  • the vapor chamber 12, suction chamber 14, air supply chamber 16 and vacuum chamber 20 extend horizontally and parallel to each other in the longitudinal direction.
  • the detection hood 10 is above a cooking point and other device in which an exhaust air to be detected is formed, installed, wherein the exhaust air rises into the vapor chamber 12.
  • the separator 18 removes impurities, especially oil and fat droplets and possibly solid particles from the exhaust air, which fall in the direction of the lower end of the suction chamber 14 and collect there.
  • a supply air is blown from above by means of a supply fan, not shown, which is in particular un-tempered outside air.
  • a throttle valve 24 is disposed at the upper end of the air supply chamber. The supply air flows down in the air supply chamber 16, being accelerated by the tapered shape.
  • the air supply chamber 16 merges at its lower end into a curved deflection region 26, which finally opens into an exhaust opening 28.
  • the deflection region 26 has, in the region of its outer radius, a rounded wall 30 which ends at the discharge opening 28 with a positive gradient.
  • the air flow emerging from the exhaust opening passes through the vapor chamber 12 in the direction of the separator 18, whereby the detection of the exhaust air rising from below and its passage into the suction chamber 14 is substantially improved.
  • the vacuum chamber 20 of the detection hood 10 is closed on all sides with the exception of a suction opening 32, which opens in the region of the inner radius of the curved deflection region 26 (the frontal boundaries of all chambers are not shown in Figure 1). From the air supply chamber 16, the negative pressure chamber 20 is separated by a wall 34, which forms an inclined boundary of the tapered air supply chamber 16.
  • the wall between the vacuum chamber mer 20 and the fume chamber 12 includes an upper portion 36 and a lower portion 38, wherein the lower portion 38 has a lower inclination (with respect to the horizontal), which substantially corresponds to the desired slope of the exiting the exhaust port 28 air flow.
  • the slope of the air flow leaving the exhaust opening 28 is thereby increased by the inventive features of the detection hood 10 by the air flow in the deflection 26 due to the negative pressure in the vacuum chamber 20 in the direction of the suction opening 32 is "pulled up".
  • This negative pressure is formed by an induction region 40, along which induction region 40 the vacuum chamber 20 and the air supply chamber 16 are separated by a wall 42 having a plurality of individual apertures 44 arranged one after the other in the longitudinal direction of the detection hood 10 and a round shape exhibit.
  • the induction region 40 is located immediately above the deflection region 26 and below the tapered region of the air supply chamber 16, so that the flow rate of the supply air in the induction region 40 is greatest.
  • the flow rate of the supply air in the induction region 40 is additionally reinforced by a flow acceleration element 46, which is arranged above the induction region 40.
  • the flow acceleration element 46 has a plurality of openings, which in this example is a perforated plate. In this case, the flow acceleration element is horizontal and the wall 42 is oriented vertically in the induction region 40.
  • FIG. 2 shows the detection hood according to FIG. 1 in a cross-sectional representation.
  • the direction of the air flow emerging from the blow-off opening 28, which is achieved in the embodiment shown, is represented by a solid arrow.
  • the airflow is inclined at an angle of about 6 ° with respect to the horizontal (dotted line) above, and by this upward component of the flow, a very effective detection of the exhaust air is achieved.
  • a dashed arrow indicates the direction of the air flow, which would be achieved without the features of the invention in a corresponding detection hood, ie when z. B. the suction opening 32 and the openings 44 in the wall 42 of the induction region 40 would be closed. In this case, the air flow would even drop slightly from the horizontal.
  • FIG. 3 shows a part of the detection hood 10 from a different perspective, wherein in particular the design of the induction area 40 and the suction opening 32 can be better seen.
  • the suction opening 32 in this embodiment has a width of about 2 cm, wherein the width of the exhaust opening 28 is about 6 cm.
  • the apertures 44 in the wall 42 of the induction region 40 each have a diameter of about 15 mm.
  • the openings in the flow acceleration element 46 have a diameter of about 5 mm. It is understood that these dimensions are merely exemplary and can be adjusted according to the dimensions and design of the detection hood.

Landscapes

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

Abstract

La présente invention concerne une hotte aspirante destinée à capter l'air évacué au-dessus d'emplacements de cuisson, de dispositifs de production et analogues. Ladite hotte aspirante comporte une chambre à buées, une chambre d'aspiration et une chambre d'amenée d'air qui s'étendent horizontalement et parallèlement l'une à l'autre dans une direction longitudinale. La chambre à buées est ouverte vers le bas et se rétrécit vers le haut. La chambre d'aspiration est séparée de la chambre à buées par un filtre ou un séparateur. Le filtre ou le séparateur forme une délimitation inclinée de la chambre à buées se rétrécissant vers le haut. La chambre d'amenée d'air se rétrécit vers le bas et se raccorde à son extrémité inférieure à une zone de déviation incurvée qui débouche dans une bouche de sortie. La bouche de sortie est disposée à l'extrémité inférieure de la chambre à buées par rapport à la chambre d'évacuation de sorte que l'air amené, qui est soufflé par le haut dans la chambre d'amenée d'air, sort par la bouche de sortie horizontalement ou obliquement vers le haut en direction du filtre ou du séparateur. La hotte aspirante comprend en outre une chambre à dépression qui est disposée entre la chambre à buées et la chambre d'amenée d'air. La chambre à dépression est fermée de tous les côtés à l'exception d'un orifice d'aspiration ménagé à son extrémité inférieure et débouchant dans la chambre d'amenée d'air au niveau du rayon intérieur de la zone de déviation incurvée de celle-ci. La chambre à dépression et la chambre d'amenée d'air sont séparées l'une de l'autre par une paroi le long d'une zone d'admission reliée vers le haut à l'orifice d'aspiration ou à la zone de déviation. La paroi comporte une pluralité de passages individuels qui sont disposés successivement dans la direction longitudinale de la hotte aspirante.
EP14703803.8A 2013-03-27 2014-02-05 Hotte aspirante Active EP2979037B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102013103124.2A DE102013103124B4 (de) 2013-03-27 2013-03-27 Erfassungshaube
PCT/EP2014/052181 WO2014154384A1 (fr) 2013-03-27 2014-02-05 Hotte aspirante

Publications (2)

Publication Number Publication Date
EP2979037A1 true EP2979037A1 (fr) 2016-02-03
EP2979037B1 EP2979037B1 (fr) 2016-09-07

Family

ID=50073160

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14703803.8A Active EP2979037B1 (fr) 2013-03-27 2014-02-05 Hotte aspirante

Country Status (6)

Country Link
US (1) US10132506B2 (fr)
EP (1) EP2979037B1 (fr)
CN (1) CN105102895B (fr)
DE (1) DE102013103124B4 (fr)
HK (1) HK1212008A1 (fr)
WO (1) WO2014154384A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017126076A1 (de) * 2017-11-08 2019-05-09 Rentschler Reven Gmbh Erfassungshaube

Family Cites Families (14)

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Publication number Priority date Publication date Assignee Title
US4047519A (en) * 1975-02-24 1977-09-13 Nett Louis A Ventilating apparatus
US3978777A (en) * 1975-02-24 1976-09-07 Nett Louis A Ventilating apparatus
GB1512785A (en) * 1975-07-24 1978-06-01 Brauer F Ltd Ejectors
US4346692A (en) * 1980-11-26 1982-08-31 Mccauley Lewis C Make-up air device for range hood
US4586486A (en) * 1984-07-06 1986-05-06 National Air Systems, Inc. Multilevel air distribution panel for air ventilation hood
US4552059A (en) * 1984-09-18 1985-11-12 Cambridge Engineering, Inc. Flow measurement for exhaust-type canopy and ventilating hood
FI71831C (fi) * 1985-04-12 1987-02-09 Halton Oy Fraonluftsanordning.
DE8531520U1 (de) * 1985-11-08 1986-01-02 Rentschler, Peter, 7126 Sersheim Lüftungsdecke zur Absaugung verbrauchter Luft aus einem Raum
FR2590813A1 (fr) * 1985-11-29 1987-06-05 Caffon Michel Dispositif pour regler l'angle de diffusion d'un air neuf a l'interieur d'une hotte d'extraction cuisine
FR2635579B1 (fr) * 1988-08-12 1990-11-09 Air Controle Sarl Ste Normande Ensemble de ventilation notamment des cuisines
FR2746174B1 (fr) * 1996-03-18 1998-06-12 Dispositif d'evacuation d'air, notamment pour cuisine professionnelle
JP2001174037A (ja) * 1999-07-01 2001-06-29 Daikin Ind Ltd トルネード型吸気・送風装置
DE19950817A1 (de) * 1999-10-21 2001-04-26 Bsh Bosch Siemens Hausgeraete Dunstabzugsvorrichtung
CN102080840A (zh) * 2009-11-30 2011-06-01 博西华电器（江苏）有限公司 一种吸油烟机

Non-Patent Citations (1)

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Title
See references of WO2014154384A1 *

Also Published As

Publication number Publication date
CN105102895B (zh) 2016-12-21
EP2979037B1 (fr) 2016-09-07
WO2014154384A1 (fr) 2014-10-02
US10132506B2 (en) 2018-11-20
CN105102895A (zh) 2015-11-25
DE102013103124B4 (de) 2015-04-02
HK1212008A1 (en) 2016-06-03
US20160097544A1 (en) 2016-04-07
DE102013103124A1 (de) 2014-10-02

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