EP0088313B1 - Hotte d'aspiration - Google Patents

Hotte d'aspiration Download PDF

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Publication number
EP0088313B1
EP0088313B1 EP83101890A EP83101890A EP0088313B1 EP 0088313 B1 EP0088313 B1 EP 0088313B1 EP 83101890 A EP83101890 A EP 83101890A EP 83101890 A EP83101890 A EP 83101890A EP 0088313 B1 EP0088313 B1 EP 0088313B1
Authority
EP
European Patent Office
Prior art keywords
nozzle
hood
air
opening
section
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
Application number
EP83101890A
Other languages
German (de)
English (en)
Other versions
EP0088313B2 (fr
EP0088313A1 (fr
Inventor
Wolf-Jürgen Dipl.-Ing. Denner
Andreas Dipl.-Ing. Biernacki
Günter Breitschwerdt
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.)
Waldner Laboreinrichtungen GmbH and Co
Original Assignee
Waldner Laboreinrichtungen GmbH and Co
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6157834&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0088313(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Waldner Laboreinrichtungen GmbH and Co filed Critical Waldner Laboreinrichtungen GmbH and Co
Priority to AT83101890T priority Critical patent/ATE16571T1/de
Publication of EP0088313A1 publication Critical patent/EP0088313A1/fr
Publication of EP0088313B1 publication Critical patent/EP0088313B1/fr
Application granted granted Critical
Publication of EP0088313B2 publication Critical patent/EP0088313B2/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B15/00—Preventing escape of dirt or fumes from the area where they are produced; Collecting or removing dirt or fumes from that area
    • B08B15/02—Preventing escape of dirt or fumes from the area where they are produced; Collecting or removing dirt or fumes from that area using chambers or hoods covering the area
    • B08B15/023—Fume cabinets or cupboards, e.g. for laboratories
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B2215/00—Preventing escape of dirt or fumes from the area where they are produced; Collecting or removing dirt or fumes from that area
    • B08B2215/003—Preventing escape of dirt or fumes from the area where they are produced; Collecting or removing dirt or fumes from that area with the assistance of blowing nozzles

Definitions

  • the invention relates to a deduction according to the preamble of claim 1.
  • US-PS 3 021776 is a trigger, in which the side side walls are provided over their entire surface with a plurality of holes through which the supply air is blown into the fume cupboard in such a way that the speed in the area of the suction opening is greatest and falling to the back wall.
  • the aim is to achieve a uniform air flow in order to achieve a static air pressure in the discharge chamber. A swirling does not take place because the single fume cupboard is arranged and designed accordingly. In this way, the vortex field aimed at according to the invention does not arise, from the center of which suction is extracted.
  • fume cupboards were equipped with a direct supply air connection in the ceiling area, through which air can be drawn in through the exhaust air fan. These fume cupboards differ from conventional fume cupboards without a supply air device in that air is sucked in via the supply air connection when the sash is closed and the air supply is restricted due to the vacuum in the fume cupboard. When the sash is open, however, most of the air is taken from the laboratory.
  • Laboratory fume cupboards are also known in which supply air is blown out in front of the windshield in such a way that it is sucked into the fume cupboard when the sash is partially or fully open.
  • the required air flow rate of conventional fume cupboards is specified in DIN 12924 and VDI guideline 2051.
  • DIN 12924 In order to prevent harmful gas outbreaks when the sash is partially or fully open, DIN 12924 requires that the ambient air enter at least 0.7 m / s with the sash open at 100 mm. This means that the volume flow extracted every hour in commercially available fume cupboards is at least 400 m 3 / h of air. This high air throughput is a considerable cost factor for the fume cupboard operator, since this air is taken from the laboratory room and must therefore be returned to the laboratory room by means of an appropriate air conditioning system.
  • the invention is therefore based on the object of specifying a deduction which enables the supply air to be blown in with a substantially higher percentage (approx. 80%) than previously (approx. 40%) without the occurrence of pollutant outbreaks.
  • This object is achieved by the measures contained in the characterizing part of claim 1.
  • the invention is based on the knowledge that a pure displacement flow, which is generated by blowing in supply air at any point in the fume cupboard, leads to outbreaks of harmful gas when the sash is open, since the entry speed of the room air is reduced by the additionally blown air and so z.
  • the air speed in the area of the sash must be increased in the manner of a laminar air curtain, this air curtain being influenced by the generation of a vortex spring inside the fume cupboard so that it is completely absorbed by the fume cupboard becomes.
  • the vortex field is generated in a partially open fume cupboard by attaching vertically arranged nozzle strips (1) on both sides, the blowout direction of which is directed towards the vertical center line of the sash (see Fig. 1).
  • Two suction openings (2) at a distance A from one another in the ceiling area (4) of the fume cupboard produce two vertically directed, counter-rotating tube swirls in connection with the nozzle bars (1) blowing in from the side, the center of which has a speed component (3) pointing vertically upwards , whereby the pollutants accumulating in the work area are transported to the suction openings.
  • each vortex is determined by the blow-out direction of the associated nozzle strip (1) (cf. FIG. 1b).
  • the generation of the vortices avoids a blunt collision of the two air curtains appearing on the side, since they receive a velocity component directed into the fume cupboard due to the superimposed vortex field.
  • the suction openings (2) can also be located in the base plate (5) of the fume cupboard, preferably if heavy gases are frequently used.
  • the trigger can also be designed so that the swirl fields run horizontally (see FIG. 2), the suction openings (2) being provided on one or on the opposite side walls (6).
  • the nozzle strips (1) are then in a horizontal position above and / or the suction opening with the direction of inflation vertically downwards or upwards.
  • the fume cupboard can also be designed so that a single swirl field is generated in the fume cupboard on its axis by only one suction opening (2) in the middle of a side wall (6) in connection with a nozzle bar (1) horizontally above or below the suction opening (3) the pollutant is transported to the suction opening.
  • the nozzle strips (1) have an approximately rectangular or square cross section (cf. FIG. 3) and are provided on their front side with an outlet opening (7, 7 ') which corresponds to the entire width of the strip (1).
  • the outlet opening (7, 7 ') is z. B. spanned a metal cloth.
  • An improvement in the inflow conditions in the fume cupboard can be achieved in that a direction into the fume cupboard is impressed in the bottom region (5) of the fume cupboard of the boundary layer that is formed there. This is done by angling the lower part of the nozzle strip (1) such that the rectangular shape in the upper part changes into a trapezoidal shape (Fig. 4). Since the air exits perpendicular to the plane of the metal sheet stretched over the bar (FIG. 4b), this results in a different outflow direction between the upper and lower part of the nozzle bar (1). The outflow direction of the lower nozzle part must be directed into the interior of the fume cupboard.
  • This division of the nozzle bar (1) requires a separate air supply for the upper and lower nozzle part and is achieved through a slot (11) between the rear wall of the nozzle and the inclined plate (9) located in the upper part of the nozzle.
  • An improvement in the speed distribution in the sense of an equalization over the entire front surface (7, 7 ') of the nozzle bar can be achieved by a rough surface of the plate (9) inclined in the nozzle bar (1) (e.g. felt covering, filter mats). This has an advantageous effect on the formation of the swirl fields.
  • a stabilization of the vortex and an improved extraction of heavy gases in the floor area (5) can be achieved by making a vertical slot (12) with a width of approx. 4 mm and a height of 100 mm in the middle of the rear exhaust wall, which is connected to the suction pipe is connected (cf. claim 8).
  • the air supply for the nozzle strips (1) can be carried out separately for each nozzle body, but can also be carried out through a common line (13) which must have a branch for the left-hand and right-hand nozzle (1).
  • the branching In order to obtain a uniform vortex distribution in the fume cupboard, the branching must be designed in such a way that the amount of air in the opposite nozzle strips can be adjusted when the fume cupboard is installed using a slide (or wedge).

Landscapes

  • Ventilation (AREA)
  • Prevention Of Fouling (AREA)
  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
  • Detergent Compositions (AREA)
  • Gas Separation By Absorption (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Treating Waste Gases (AREA)
  • Devices For Use In Laboratory Experiments (AREA)
  • Air-Flow Control Members (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)

Claims (8)

1. Hotte d'aspiration pour l'évacuation de gaz, de vapeurs et de matières en suspension, hotte de laboratoire en particulier, constituée d'un carter de hotte, d'un dispositif (13) d'alimentation en air amené et d'un ou plusieurs orifices d'évacuation (2), l'air amené étant tiré soit à 100 %, soit seulement partiellement de l'air ambiant, par l'intermédiaire par exemple d'une tubulure reliant le carter de hotte à l'air extérieur, et au moins une buse laminaire (1) pour l'air amené étant prévue au voisinage de l'orifice d'aspiration avant, buse dont l'orifice de sortie est orienté dans le plan de l'orifice d'aspiration avant, caractérisée par le fait qu'au moins un des orifices d'évacuation (2) est disposé dans le carter de manière à ce que le sens d'évacuation s'étende dans le sens de l'axe (3) du courant tourbillonnaire qui s'établit à l'intérieur de la hotte.
2. Hotte d'aspiration selon la revendication 1, caractérisée par le fait que les buses laminaires (1) sont disposées contre l'orifice d'aspiration supérieur et/ou inférieur, et que le ou les orifice(s) d'évacuation (2) est ou sont disposé(s) sur les parois latérales (6).
3. Hotte d'aspiration selon la revendication 1, caractérisée par le fait qu'une buse laminaire (1) s'étendant verticalement est disposée de chaque côté de l'orifice d'aspiration, et que deux orifices d'évacuation (2) sont disposés sur la plaque de couvercle (4), les orifices de sortie des buses laminaires (1) étant tournés les uns vers les autres.
4. Hotte d'aspiration selon la revendication 3, caractérisée par le fait que les orifices d'évacuation (2) sont disposés sur la plaque de fond (5).
5. Hotte d'aspiration selon l'une quelconque des revendications 1 à 4, caractérisée par le fait que la buse laminaire (1) est constituée d'un carter de buse (8) de section sensiblement rectangulaire, que le côté avant (7) est configuré en forme d'orifice de sortie, orifice qui est recouvert d'un élément de résistance à l'écoulement à grande surface, toile métallique par exemple, qu'une plaque (9) est disposée dans le carter de buse (8), plaque qui réduit constamment la section de la buse à partir de l'orifice d'entrée (10) pour l'air amené (voir la figure 3).
6. Hotte d'aspiration selon l'une quelconque des revendications 1 à 4, caractérisée par le fait que la buse laminaire (1) présente dans sa partie supérieure une section sensiblement rectangulaire, que le côté avant (7) est configuré en forme d'orifice de sortie, orifice qui est recouvert d'un élément de résistance à l'écoulement à grande surface, qu'une plaque (9) est disposée dans le carter de buse (8), plaque qui réduit constamment la section de la buse dans la partie supérieure, que la section est de forme trapézoïdale dans la partie inférieure, de façon que l'orifice de sortie (7') forme un angle par rapport à l'orifice de sortie (7), et que l'air amené à l'orifice de sortie (7') est dirigé par une fente (11) située entre la plaque (9) et la paroi arrière de la buse.
7. Hotte d'aspiration selon les revendications 5 et 6, caractérisée par le fait que la plaque (9) présente une surface rugueuse, en étant par exemple revêtue de feutre.
8. Hotte d'aspiration selon l'une quelconque des revendications 1 à 7, caractérisée par le fait qu'il est prévu au milieu de la paroi arrière de la hotte une fente verticale (12) qui se trouve au-dessus de la plaque de fond (5), et qui s'étend sur environ 10 % de la hauteur de la hotte.
EP83101890A 1982-03-10 1983-02-25 Hotte d'aspiration Expired - Lifetime EP0088313B2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83101890T ATE16571T1 (de) 1982-03-10 1983-02-25 Abzug zur absaugung von gasen, daempfen und schwebstoffen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3208622 1982-03-10
DE3208622A DE3208622C1 (de) 1982-03-10 1982-03-10 Abzug zur Absaugung von Gasen,Daempfen und Schwebstoffen

Publications (3)

Publication Number Publication Date
EP0088313A1 EP0088313A1 (fr) 1983-09-14
EP0088313B1 true EP0088313B1 (fr) 1985-11-21
EP0088313B2 EP0088313B2 (fr) 1991-06-19

Family

ID=6157834

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83101890A Expired - Lifetime EP0088313B2 (fr) 1982-03-10 1983-02-25 Hotte d'aspiration

Country Status (7)

Country Link
US (2) US4550650A (fr)
EP (1) EP0088313B2 (fr)
JP (1) JPS58223444A (fr)
AT (1) ATE16571T1 (fr)
DE (1) DE3208622C1 (fr)
DK (1) DK116283A (fr)
NO (1) NO161897C (fr)

Families Citing this family (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3232203C2 (de) * 1982-08-30 1985-04-18 Heinrich Dipl.-Ing. 5205 St Augustin Hilbers Verfahren und Vorrichtung zum Absaugen und Abführen von Schadstoffen in Laboratorien oder dgl.
DE3431669A1 (de) * 1984-08-29 1986-03-13 Müller, Johannes, 5202 Hennef Laborabzug und absaugverfahren mit zulufteinleitung
DE3604422A1 (de) * 1986-02-13 1987-08-20 Kessler & Luch Gmbh Vorrichtung zum saeubern kontaminierter oberflaechen mittels stroemender luft
JPH0248770Y2 (fr) * 1986-05-29 1990-12-20
JPH0665935B2 (ja) * 1987-07-10 1994-08-24 日本エアーカーテン株式会社 二連竜巻式空調換気機構
FR2619733B1 (fr) * 1987-08-27 1991-11-22 Rhone Poulenc Ind Hotte de travail, notamment pour laboratoires
JPH01137136A (ja) * 1987-11-25 1989-05-30 Nippon Air Curtain Kk 人工竜巻式空調換気機構
JPH01300145A (ja) * 1988-05-26 1989-12-04 Japan Air Curtain Corp 人工竜巻式の局所排気装置
DK312288D0 (da) * 1988-06-08 1988-06-08 Hansen & Raagaard Aps Fremgangsmaade og anlaeg til mekanisk punktudsugning
JPH02208435A (ja) * 1989-02-07 1990-08-20 Japan Air Curtain Corp 人工竜巻発生機構及びその装置
EP0465553A1 (fr) * 1989-03-29 1992-01-15 Airchitect I Söderhamn Ab Unite de conditionnement d'air pour animaux de laboratoire
US5059079A (en) * 1989-05-16 1991-10-22 Proconics International, Inc. Particle-free storage for articles
JPH0331242U (fr) * 1989-07-31 1991-03-27
DE9418235U1 (de) * 1994-11-14 1995-01-05 MMM Medcenter Einrichtungen GmbH, 82152 Planegg Vorrichtung, insbesondere Wärmeschrank
US6089970A (en) * 1997-11-24 2000-07-18 The Regents Of The University Of California Energy efficient laboratory fume hood
DE19957962B4 (de) * 1999-05-19 2009-01-29 Röhl-Hager, Hannelore Verfahren und Einrichtung zum Eingrenzen, Erfassen und Absaugen von fluiden Medien
AU5962000A (en) * 1999-05-19 2000-12-05 Georg Emanuel Koppenwallner Method and device for localising, detecting and suctioning liquid media
AU2351401A (en) 1999-12-14 2001-06-25 Georg Emanuel Koppenwallner Method and device for capturing, separating and aspirating fluids using frontal turbulence generators
US6302786B1 (en) 2000-02-29 2001-10-16 Case Systems, Inc. Vented cabinet
US6428408B1 (en) 2000-05-18 2002-08-06 The Regents Of The University Of California Low flow fume hood
GB2390151B (en) * 2002-06-28 2006-05-10 Tornex Inc Enclosure-based suction apparatus
ITPN20060058A1 (it) 2006-07-27 2008-01-28 Electrolux Professional Spa Cappa di aspirazione a ventilazione perfezionata
DE102009034342A1 (de) * 2009-07-20 2011-03-03 Fachhochschule Lausitz Vorrichtung und Verfahren zur Absaugung
TWI426220B (zh) * 2011-03-22 2014-02-11 Univ Nat Taiwan Science Tech An exhaust device with a flap plate
KR101934457B1 (ko) * 2011-11-17 2019-01-04 삼성전자주식회사 환기 장치와 이를 포함한 환기 시스템
US9541296B2 (en) * 2014-05-22 2017-01-10 National Taiwan University Of Science And Technology Soot-exhausting device
DE202017002012U1 (de) * 2016-05-17 2017-08-21 Brand Gmbh + Co Kg Gehäuse für ein Laborgerät

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3021776A (en) * 1958-02-19 1962-02-20 Barber Colman Co Method and apparatus for ventilating laboratory fume hoods
US3023688A (en) * 1958-05-16 1962-03-06 Jr Fred A Kramer Air barrier
GB1002297A (en) * 1960-06-14 1965-08-25 Henry George Frederick Jenning Improvements in or relating to fume cupboards
DE1289974B (de) * 1964-11-07 1969-02-27 Siemens Elektrogeraete Gmbh Einrichtung zum Absaugen von mit unerwuenschten Beimengungen versetzter Luft
US3254588A (en) * 1965-05-24 1966-06-07 Truhan Andrew Laboratory fume hood
US3408914A (en) * 1967-02-06 1968-11-05 Bayern Joseph Fumehood with auxiliary air supply and by-pass conduit means
CH445784A (de) * 1967-03-11 1967-10-31 Krantz H Fa Kapelle für Chemielabors
US3747505A (en) * 1972-02-18 1973-07-24 American Hospital Supply Corp Air flow system for fume hood
US4050368A (en) * 1976-01-02 1977-09-27 Marion L. Eakes Co. Exhaust system for industrial processes
US4339248A (en) * 1976-11-08 1982-07-13 Grow Group, Inc. Process for the purification of gaseous effluent from industrial processes
US4123967A (en) * 1977-06-08 1978-11-07 Shanis Arnold A Air barrier device using pressurized swirls

Also Published As

Publication number Publication date
DK116283D0 (da) 1983-03-10
US4550650A (en) 1985-11-05
JPH035852B2 (fr) 1991-01-28
JPS58223444A (ja) 1983-12-26
NO161897C (no) 1989-10-11
ATE16571T1 (de) 1985-12-15
DK116283A (da) 1983-09-11
NO161897B (no) 1989-07-03
EP0088313B2 (fr) 1991-06-19
EP0088313A1 (fr) 1983-09-14
NO830828L (no) 1983-09-12
DE3208622C1 (de) 1983-12-15
US4622888A (en) 1986-11-18

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