EP3483510A1 - Hotte d'aspiration - Google Patents

Hotte d'aspiration Download PDF

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Publication number
EP3483510A1
EP3483510A1 EP18202253.3A EP18202253A EP3483510A1 EP 3483510 A1 EP3483510 A1 EP 3483510A1 EP 18202253 A EP18202253 A EP 18202253A EP 3483510 A1 EP3483510 A1 EP 3483510A1
Authority
EP
European Patent Office
Prior art keywords
chamber
air
suction
detection hood
air supply
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP18202253.3A
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German (de)
English (en)
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 EP3483510A1 publication Critical patent/EP3483510A1/fr
Withdrawn legal-status Critical Current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

  • a detection hood of this kind as for example in the US 3,978,777 is described in the detection of exhaust air, which rises from a cooking place or production facility, much more efficient than detection hoods of simpler design, which have only a suction.
  • 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, roasting, frying, etc.
  • the exhaust air to be detected contains here especially water vapor, oil and grease.
  • the use of such detection hoods is not limited to hotplates, they can be used for example in production processes of any kind for detecting exhaust air, 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 supply air which is blown in such detection hoods in the Zu Kunststoffsch, supplied from outside the building in which the detection hood is installed. So it is needed outside air, which must be transported via appropriate line systems to the detection hood. Depending on the size of the building and the location of the detection hood, this is associated with considerable additional effort in terms of installation technology.
  • the supply of outside air into the building can also be problematic from a health point of view, if a load of pollutants is to be feared, so that possibly additional measures for air purification are required.
  • the invention has the object of developing a generic detection hood so that the above problems can be avoided.
  • the detection hood comprises one or more suction, which are arranged so that ambient air directly from the environment of the detection hood of the air supply chamber can be supplied as supply air.
  • the supply of outside air i.e., air outside the building
  • the detection hood is installed in an indoor space of a building
  • the supplied ambient air is around the room air of the indoor space. This is supplied by the one or more suction directly to the air supply chamber as supply air.
  • the interior is not substantially more air removed than in a detection hood, which has only one suction.
  • a detection hood which has only one suction.
  • these turbulent flows are largely due to a laminar, directional flow, which at the same time ensures that the collection of exhaust air is more efficient and complete.
  • the air balance of the interior remains essentially unaffected.
  • the one or more suction openings are arranged in a region of the detection hood, which lies opposite in cross-section of the suction chamber. In a typical installation situation of the detection hood along a building wall, this corresponds to the front area of the detection hood, which is oriented towards the interior.
  • the suction are then also in the vicinity of the air supply chamber, which is advantageous from a design point of view.
  • the one or more suction ports may be oriented downwardly and / or horizontally outwardly. Downwardly oriented intake openings should be located outside the area from which the exhaust air rises. Typically, the detection hood projects beyond the cooking area or production facility into the interior. As a rule, however, a horizontal arrangement of the intake openings will be preferred in order to be able to reliably avoid an interaction with the exhaust air flow.
  • a plurality of suction openings are provided, which are arranged side by side along the longitudinal direction of the detection hood.
  • suction openings may also be provided on the end faces of the detection hood.
  • the detection hood preferably comprises at least one supply air blower through which the supply air to the intake or the air supply chamber can be fed.
  • one or more supply air fans may be provided along the longitudinal direction of the detection hood.
  • the at least one supply air blower is preferably arranged above the air supply chamber and / or in cross section on the side opposite the suction chamber of the air supply chamber. Due to the upward Rejuvenating vapor chamber is in this area sufficient space available to accommodate the supply fan or in a detection hood with a total rectangular cross-section.
  • the detection hood comprises at least one 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 outside air usually because 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 (for example, metal mesh or steel wool), whereas as a separator, elements with a defined geometry enable targeted separation of, in particular, 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 towards the environment 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 entirely or partially by a wall which separates the vapor chamber from the air supply chamber.
  • This wall may in particular, as well as most other constituents of the detection hood, be formed from a stainless steel sheet.
  • the functional principle of the detection hood according to the invention can be realized all the more effectively, the more the supply air flow from the horizontal can be directed in an obliquely upward direction, since with respect to the exhaust air as far as possible upward flow is to be effected.
  • this can hardly be realized with conventional design measures, since this requires a deflection of the incoming from the top into the curved deflection air supply air must be made at an acute angle.
  • the curved deflection region can be designed with a corresponding geometry, it has been shown in practice that turbulences then occur and the inner radius of the deflection region is largely free of flow, so that the air flow emerging from the blowout opening often has too low a slope or even slight is sloping.
  • the detection hood further comprises a vacuum chamber, which is arranged in the region of the air supply chamber, the vacuum chamber is closed on all sides with the exception of a suction opening at its lower end, in the region of an inner radius of the curved Deflection region of the air supply chamber opens into this, and wherein the vacuum chamber and the air supply chamber along an induction region, which adjoins the suction opening or to the deflection region upwards, are separated by a wall having a plurality of individual openings, which in the longitudinal direction Detection hood are arranged consecutively.
  • the operation of this arrangement 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.
  • a negative pressure in the adjacent vacuum chamber is induced via the openings in this wall, which in turn causes a suction effect in the deflection region into which the suction opening flows via the suction opening.
  • This mouth is located at the inner radius, ie above of the deflected in an approximately horizontal direction airflow. Because of the suction opening, this air flow is thus somewhat “pulled upwards", so that it emerges from the outlet opening at a greater gradient than would be the case without the inventive air supply chamber with the induction area and the suction opening.
  • 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 °, 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 orifices depends on the dimensions of the detection hood, and in a typical embodiment, the orifice is e.g. 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 individual openings in the induction region ie in the wall between the vacuum chamber and the air supply chamber in this area, can have different shapes, wherein the openings should be optimized with regard to 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 supply air and has a plurality of openings.
  • 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 vapor chamber is separated from the vacuum chamber by a wall which forms an inclined boundary of the vapor chamber opposite the filter or separator (or a portion of this boundary).
  • the inclination of this wall substantially corresponds to the desired slope of the air flow emerging from the exhaust opening.
  • the wall between the vapor chamber and the vacuum chamber may be inclined at an angle of 15 ° to 30 ° relative to the horizontal.
  • FIG. 1 shows a cross-sectional 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 is perpendicular to the plane of the drawing. For the sake of clarity are in the FIG. 1 only the essential elements of the detection hood 10 are shown.
  • the detection hood 10 includes a centrally located vapor chamber 12 which is open towards the environment and tapers upwardly.
  • a suction chamber 14 and an air supply chamber 16 are arranged, wherein the suction chamber 14 through a separator 18 in fluid communication with the vapor chamber 12, and wherein the separator 18 forms an inclined boundary of the vapor chamber 12.
  • the vapor chamber 12 is separated in an upper region by a wall 36 of the air supply chamber 16, while in a lower region, a vacuum chamber 20 between the vapor chamber 12 and the air supply chamber 16 is arranged.
  • the vacuum chamber 20 is separated from the vapor chamber 12 by a wall 38 which is less inclined relative to the horizontal than the wall 36th
  • 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. At the two end faces of the detection hood 10, all chambers are bounded in each case by an end wall 22 whose lower edge in the FIG. 1 is shown.
  • the detection hood 10 is above a cooking position and other means in which an exhaust air to be detected is formed, installed, wherein the exhaust air rises into the vapor chamber 12. From there it passes through the separator 18 into the suction chamber 14 and is removed by means of a suction fan, which is not shown in the figure, through the arranged at the upper end of the suction chamber 14 suction opening 24.
  • 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 by means of a Zu Kunststoffgebläses 48 and flows in this downward.
  • the supply air blower 48 is disposed above and to the right of the air supply chamber 16, wherein the air supply chamber 16 has an angled cross-sectional shape.
  • the lower, horizontally extending portion of the air supply chamber 16 is tapered with respect to the upper, approximately vertically extending portion.
  • a plurality of supply air fans 48 it is also possible for a plurality of supply air fans 48 to be arranged along the longitudinal direction.
  • the supply air is drawn from the supply air blower 48 through a plurality of suction ports 50, directly from the vicinity of the detection hood 10, i. from the indoor air of the interior in which the detection hood 10 is installed.
  • suction openings 50 are arranged in a region of the detection hood 10 opposite the suction chamber 18, ie in a forwardly oriented area, when the detection hood 10 is typically installed with the suction chamber 14 along a wall of the interior space.
  • the suction ports 50 are juxtaposed along the longitudinal direction of the detection hood 10, in which example a part of the suction ports 50a is oriented downwardly and a part of the suction ports 50b horizontally outward.
  • a plurality of suction openings 50a and 50b it is also possible to provide in each case a single, longitudinally extending suction opening.
  • 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 into the inner radius of the curved deflection region 26 in this (compare the above-mentioned boundaries of all chambers).
  • the negative pressure chamber 20 is separated by a wall 34, which forms a boundary of the tapered lower portion of the air supply chamber 16.
  • the wall 38 between the vacuum chamber 20 and the vapor chamber 12 has a slope which is substantially the desired Slope of emerging from the exhaust port 28 air flow corresponds.
  • FIG. 1 The course of the air flow from the intake ports 50 to the supply air blower 48, through the air supply chamber 16 and the curved deflection region 26 to the exhaust port 28, and through the suction chamber 14 in the direction of the separator 18 is in the FIG. 1 represented by arrows.
  • the slope of the air flow leaving the blow-off opening 28 is increased by virtue of the fact that the air flow in the deflection region 26 is "pulled upwards" in the direction of the suction opening 32 due to the negative pressure in the vacuum chamber 20.
  • 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 respectively.
  • the induction region 40 is arranged directly 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 is relatively large.
  • 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 Strömungsbevantungselement 46 has a plurality of openings, which is a perforated plate in this example. In this case, the Strömungsbevantungselement is horizontal and the wall 42 in the induction region 40 vertically oriented.
  • FIG. 2 shows a part of the detection hood 10 in a perspective view, wherein in particular the design of the induction region 40 and the suction opening 32 can be seen better.
  • the suction opening 32 in this embodiment has a width of about 2 cm, 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.

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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)
EP18202253.3A 2017-11-08 2018-10-24 Hotte d'aspiration Withdrawn EP3483510A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102017126076.5A DE102017126076A1 (de) 2017-11-08 2017-11-08 Erfassungshaube

Publications (1)

Publication Number Publication Date
EP3483510A1 true EP3483510A1 (fr) 2019-05-15

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ID=63965476

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18202253.3A Withdrawn EP3483510A1 (fr) 2017-11-08 2018-10-24 Hotte d'aspiration

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EP (1) EP3483510A1 (fr)
DE (1) DE102017126076A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111425903B (zh) * 2020-04-15 2022-05-17 宁波方太厨具有限公司 一种吸油烟机

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2034646A1 (de) * 1970-07-13 1972-01-20 Emw Betrieb Schaumstoff Kg Emm Absauggerat für Arbeitsplatze
US3978777A (en) 1975-02-24 1976-09-07 Nett Louis A Ventilating apparatus
JPS5956030A (ja) * 1982-09-27 1984-03-31 陳　重宗 排気方法及び装置
DE8531520U1 (de) * 1985-11-08 1986-01-02 Rentschler, Peter, 7126 Sersheim Lüftungsdecke zur Absaugung verbrauchter Luft aus einem Raum
JP2005098618A (ja) * 2003-09-25 2005-04-14 Fuji Industrial Co Ltd Ｉｈクッキングヒータ用のレンジフード
DE102013103124A1 (de) * 2013-03-27 2014-10-02 Rentschler Reven Gmbh Erfassungshaube
WO2015057072A1 (fr) * 2013-10-17 2015-04-23 Randolph Beleggingen B.V. Hotte d'extraction d'air de cuisine ayant une cavité ayant une paroi de délimitation permettant le guidage et l'orientation d'air

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2034646A1 (de) * 1970-07-13 1972-01-20 Emw Betrieb Schaumstoff Kg Emm Absauggerat für Arbeitsplatze
US3978777A (en) 1975-02-24 1976-09-07 Nett Louis A Ventilating apparatus
JPS5956030A (ja) * 1982-09-27 1984-03-31 陳　重宗 排気方法及び装置
DE8531520U1 (de) * 1985-11-08 1986-01-02 Rentschler, Peter, 7126 Sersheim Lüftungsdecke zur Absaugung verbrauchter Luft aus einem Raum
JP2005098618A (ja) * 2003-09-25 2005-04-14 Fuji Industrial Co Ltd Ｉｈクッキングヒータ用のレンジフード
DE102013103124A1 (de) * 2013-03-27 2014-10-02 Rentschler Reven Gmbh Erfassungshaube
WO2015057072A1 (fr) * 2013-10-17 2015-04-23 Randolph Beleggingen B.V. Hotte d'extraction d'air de cuisine ayant une cavité ayant une paroi de délimitation permettant le guidage et l'orientation d'air

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Publication number Publication date
DE102017126076A1 (de) 2019-05-09

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