EP0088313A1 - Fume hood - Google Patents

Fume hood Download PDF

Info

Publication number
EP0088313A1
EP0088313A1 EP83101890A EP83101890A EP0088313A1 EP 0088313 A1 EP0088313 A1 EP 0088313A1 EP 83101890 A EP83101890 A EP 83101890A EP 83101890 A EP83101890 A EP 83101890A EP 0088313 A1 EP0088313 A1 EP 0088313A1
Authority
EP
European Patent Office
Prior art keywords
nozzle
air
supply air
section
opening
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
EP83101890A
Other languages
German (de)
French (fr)
Other versions
EP0088313B1 (en
EP0088313B2 (en
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(A1) "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/en
Publication of EP0088313A1 publication Critical patent/EP0088313A1/en
Publication of EP0088313B1 publication Critical patent/EP0088313B1/en
Application granted granted Critical
Publication of EP0088313B2 publication Critical patent/EP0088313B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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.
  • Known fume cupboards extract the air that transports the pollutants accumulating on the work surface from the surrounding laboratory space by sucking in the laboratory air in the area of the sash or via the provided access openings or with a closed bypass valve via a suction fan.
  • 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 malicious g as- outbreaks in partly or completely open sash is therefore called for in DIN 12924 at 100 mm open sash an entry velocity of the ambient air of at least 0.7 m / s.
  • 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. *)
  • 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 field inside the fume cupboard so that it is completely removed from the fume cupboard is recorded.
  • the vortex field is generated in a partially open fume cupboard by attaching laminar nozzles arranged vertically on both sides in the area of the sash, the direction of which is directed towards the vertical center line of the sash (see Fig. 1).
  • each vortex is determined by the blow-out direction of the associated nozzle (see FIG. 1 b).
  • 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 can also be located in the base plate of the fume cupboard, preferably if heavy gases are frequently used.
  • the fume cupboard can also be designed in such a way that the swirl fields run horizontally (cf. FIG. 2), the suction openings being provided on one or on the opposite side walls.
  • the nozzle strips 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 by means of only one suction opening in the middle of a side wall in connection with a nozzle bar located horizontally above or below the suction opening, on the axis of which the pollutant transport to the suction opening takes place.
  • the nozzle strips have an approximately rectangular or square cross section (cf. FIG. 3) and are provided on their front side with an outlet opening which corresponds to the entire width of the strip.
  • the outlet opening is z. B. spanned a metal cloth.
  • An improvement in the inflow conditions in the fume cupboard can be achieved by embossing a direction into the fume cupboard in the bottom area of the fume cupboard of the boundary layer formed there. This is done by angling the lower part of the nozzle strip in such a way that the rectangular shape in the upper part changes into a trapezoidal shape (FIG. 4). Since the air exits perpendicularly to the plane of the metal sheet stretched over the bar (FIG. 4 b), this results in a different outflow direction between the upper one and lower part of the nozzle bar. The outflow direction of the lower nozzle part must be directed into the interior of the fume cupboard. This division of the nozzle requires a separate air supply for the upper and lower nozzle part and is achieved through a slot between the rear wall of the nozzle and the sloping plate 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 of the nozzle can be achieved by a rough surface of the plate inclined in the nozzle (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 can be achieved in that a vertical slot with a width of approx. 4 mm and a height of 100 mm is made in the middle of the rear exhaust wall, which is connected to the extraction pipe (cf. claim 8th).
  • the air supply for the nozzle strips 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.
  • 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 mounted using a slide (or wedge).

Landscapes

  • Ventilation (AREA)
  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
  • Prevention Of Fouling (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)
  • Filtering Of Dispersed Particles In Gases (AREA)
  • Air-Flow Control Members (AREA)

Abstract

The hood for the extraction of gases, vapors and suspended matter comprises a hood casing, a supply air feed device and one or more suction outlets. It serves preferably as a laboratory hood. In the vicinity of the front suction inlet is provided at least one nozzle ledge for the supply air, whose outlet port is directed in the plane of the front suction inlet. At least one suction outlet is provided, which extracts in the direction of the axis of the vortex flow. According to a preferred embodiment, there are two suction outlets and two facing nozzle ledges. The nozzle ledges can have a rectangular cross-section, the front side being constructed as an outlet port. There is a constant reduction in the nozzle cross-section.

Description

Die Erfindung betrifft einen Abzug nach dem Oberbegriff des Patentanspruchs 1.The invention relates to a deduction according to the preamble of claim 1.

Bekannte Laborabzüge entnehmen die Luft, die die auf der Arbeitsfläche anfallenden Schadstoffe transportiert, dem umgebenden Laborraum, indem über einen Absaugventilator die Laborluft im Bereich des Frontschiebers bzw. über die vorgesehenen Eingriffsöffnungen oder bei geschlossenem Schieber über einen Bypass angesaugt wird.Known fume cupboards extract the air that transports the pollutants accumulating on the work surface from the surrounding laboratory space by sucking in the laboratory air in the area of the sash or via the provided access openings or with a closed bypass valve via a suction fan.

Es ist auch bekannt, daß Laborabzüge mit einer direkten Zuluftverbindung im Deckenbereich ausgestattet wurden, über die durch das Abluftgebläse Luft angesaugt werden kann. Diese Abzüge unterscheiden sich von herkömmlichen Abzügen ohne Zulufteinrichtung dadurch, daß bei geschlossenem Frontschieber und damit eingeschränkter Luftzuführung aus dem Laborraum auf Grund des Unterdrucks im Abzugs über die Zuluftverbindung Luft angesaugt wird. Bei geöffnetem Frontschieber wird jedoch die Luft weitgehend dem Labor entnommen.It is also known that Laborabzü e g were equipped with a direct supply air in the ceiling area can be sucked in via the exhaust fan through the air. These prints differ from conventional Abzü g s without air device in that when the sash is closed and restricted air supply from the laboratory due to the negative pressure is sucked in the exhaust hood over the air supply air. When the sash is open, however, most of the air is taken from the laboratory.

Bekannt sind auch Laborabzüge, bei denen Zuluft vor der Frontscheibe derart ausgeblasen wird, daß diese bei teilweise oder ganz geöffnetem Frontschieber in den Abzug gesaugt wird.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.

Aus der DE-OS 2659736 ist weiterhin bekannt, eine Luftzuführeinrichtung an der Vorderkante eines Laborabzugs anzuordnen. Dies hat folgende Nachteile. Die Lüftdurchmischung ist relativ gering, die Schadstoffe werden in den vorderen Bereich des Laborabzugs transportiert und Teile der verunreinigten Luft werden umgewälzt.From DE-OS 2659736 it is also known to arrange an air supply device on the front edge of a fume cupboard. This has the following disadvantages. The mixing of the air is relatively low, the pollutants are transported to the front area of the fume cupboard and parts of the contaminated air are circulated.

Der erfoderliche Luftdurchsatz herkömmlicher Laborabzüge ist in DIN 12924 und der VDI-Richtlinie 2051 festgelegt. Um Schadgas- ausbrüche bei teilweise oder ganz geöffnetem Frontschieber zu verhindern, wird deshalb in DIN 12924 bei 100 mm geöffnetem Frontschieber eine Eintrittsgeschwindigkeit der Umgebungsluft von mindestens 0,7 m/s gefordert. Dies bedingt, daß der stündlich abgesaugte Volumenstrom bei handelsüblichen Laborabzügen mindestens 400 m3/l, Luft beträgt. Dieser hohe Luftdurchsatz ist ein beträchtlicher Kostenfaktor für den Betreiber des Abzugs, da diese Luft dem Laborraum entnommen wird und demnach durch eine entsprechende Klimaanlage dem Laborraum wieder zugeführt werden muß. Insbesondere bei mehreren Abzügen innerhalb eines Laborraums treten dadurch hohe Luftwechsel auf (bis zu 20- fachem Luftwechsel pro Stunde), so daß das Laborpersonal ständig Zugerscheinungen ausgesetzt ist. Wird die vom Laborabzug abzusaugende Luft jedoch nicht dem Laborraum entzogen, sondern zusätzlich in den Abzug eingeblasen, kann bei geeigneter Ausbildung des Strömungsfeldes im Abzug sowohl eine Kapselung und Absaugung der Schadstoffe voraenommen werden, als auch Zugerscheingungen im Labor vermieden werden, wodurch die Klimaanlage des Labors eine wesentlich geringere Kapazität aufweisen kann.The required air flow rate of conventional fume cupboards is specified in DIN 12924 and VDI guideline 2051. In order to prevent malicious g as- outbreaks in partly or completely open sash is therefore called for in DIN 12924 at 100 mm open sash an entry velocity of the ambient air of at least 0.7 m / s. This means that the hourly volume flow extracted in commercially available fume cupboards is at least 40 0 m 3 / l, 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. Particularly when there are several fume cupboards within a laboratory room, high air changes occur (up to 20 air changes per hour), so that laboratory personnel are constantly exposed to drafts. If, however, the air to be extracted from the fume cupboard is not extracted from the laboratory room, but is additionally blown into the fume cupboard, with a suitable design of the flow field in the fume cupboard, encapsulation and extraction of the pollutants can be carried out, as well as drafts in the laboratory, thereby avoiding air conditioning in the laboratory can have a significantly lower capacity.

Der Erfindung liegt deshalb die Aufgabe zugrunde, einen Abzug anzugeben, der das Einblasen von Zuluft mit einem wesentlich höheren Prozentsatz (ca..80 %) als bisher (ca. 40 %) ermöglicht, ohne daß Schadstoffausbrüche auftreten. *)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. *)

Vorteilhafte Ausgestaltungen der Erfindung sind in den Unteransprüchen angegeben.Advantageous embodiments of the invention are specified in the subclaims.

Die Erfindung beruht auf der Erkenntnis, daß eine reine Verdrängungsströmung, die durch Einblasen von Zuluft an beliebiger Stelle des Laborabzugs erzeugt wird, bei geöffnetem Frontschieber zu Schadgasausbrüchen führt, da die Eintrittsgeschwindigkeit der Raumluft durch die zusätzlich eingeblasene Luft heruntergesetzt wird und so z. B. bei voll geöffnetem Frontschieber mit einer Öffnungsfläche von 1 m2 bei 400 m3/h abgesaugter Luft und 80 % Zuluft nur noch ca.. 0,02 m/s beträgt, so daß selbst kleinste Störungen durch Zugluft oder vorbeigehende Personen zum Ausmischen von Schadgas führen.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. B. with a fully open sash with an opening area of 1 m 2 at 400 m 3 / h of extracted air and 80% supply air is only approx. 0.02 m / s, so that even the smallest disturbances due to drafts or people walking past to A lead mixing of harmful gas.

Um eine Abschirmung der Frontseite des Laborabzugs bei.geöffnetem Frontschieber zu erreichen, muß deshalb die Luftgeschwindigkeit im Bereich des Frontschiebers nach Art eines laminaren Luftschleiers erhöht werden, wobei dieser Luftschleier durch Erzeugung eines innerhalb des Abzuges liegenden Wirbelfeldes so beeinflußt wird, daß er vollständig vom Laborabzug aufgenommen wird.In order to shield the front of the fume cupboard when the sash is open, 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 field inside the fume cupboard so that it is completely removed from the fume cupboard is recorded.

Anhand von Ausführungsbeispielen wird die Erfindung näher erläutert. Es zeigen:

  • Figur 1 a: Schematische Dartstellungen eines Abzuges in der Vorderansicht nach Anspruch 1 und 2.
  • Figur 1 b: Darstellung mit Draufsicht des Wirbelfeldes. *) Diese Aufgabe wird erfindungsgemäß durch die im Kennzeichen des Anspruchs 1 enthaltenen Maßnahmen gelöst.
  • Figur 2 a: Schematische Darstellung eines Abzuges nach Anspruch 4.
  • Figur 2 b: Seitenansicht des Abzugs nach Anspruch 4.
  • Figur 3: Perspektivische Darstellung einer Düsenleiste nach Anspruch 5.
  • Figur 4 a:.Perspektivische Darstellung einer Düsenleiste nach Anspruch 6.
  • Figur 4 b: Schnitt durch den unteren Teil der Düsenleiste.
The invention is explained in more detail using exemplary embodiments. Show it:
  • Figure 1 a: Schematic darts of a trigger in the front view according to claims 1 and 2.
  • Figure 1 b: Top view of the vortex field. *) This object is achieved according to the invention by the measures contained in the characterizing part of claim 1.
  • Figure 2 a: Schematic representation of a trigger according to claim 4.
  • Figure 2 b: side view of the trigger according to claim 4.
  • Figure 3: Perspective view of a nozzle bar according to claim 5.
  • Figure 4 a:. Perspective representation of a nozzle bar according to claim 6.
  • Figure 4 b: section through the lower part of the nozzle bar.

Das Wirbelfeld wird in einem Ausführungsbeispiel in einem teilweise offenen Laborabzug dadurch erzeugt, daß im Bereich des, Frontschiebers beidseitig vertikal angeordnete Laminardüsen angebracht werden, deren Ausblasrichtung zur vertikalen Mittellinie des Frontschiebers gerichtet ist (vgl. Fig. 1). Durch zwei im Abstand A voneinander entfernte Absaugöffnungen im Deckenbereich des Abzuges werden in Verbindung mit den seitlich einblasenden Düsen zwei vertikal gerichtete, gegensinnig rotierende Schlauchwirbel erzeugt, deren Zentrum eine senkrecht nach oben gerichtete Geschwindigkeitskomnonente aufweist, wodurch die im Arbeitsbereich anfallenden Schadstoffe zu den Absaugöffnungen hin transportiert werden.In one embodiment, the vortex field is generated in a partially open fume cupboard by attaching laminar nozzles arranged vertically on both sides in the area of the sash, the direction of which is directed towards the vertical center line of the sash (see Fig. 1). Two suction openings at a distance A from each other in the ceiling area of the fume cupboard, in conjunction with the side-blowing nozzles, create two vertically directed, counter-rotating hose vortices, the center of which has a vertically upward speed component, whereby the pollutants accumulating in the work area are transported to the suction openings will.

Die Drehrichtung eines jeden Wirbels wird dabei durch die Ausblasrichtung der dazugehörigen Düse bestimmt (vgl. Fig. 1 b). Durch die Erzeugung der Wirbel wird ein stumpfes Aufeinandertreffen der beiden seitlich auftretenden Luftvorhänge vermieden, da diese durch das überlagerte Wirbelfeld eine in den Abzug hineingerichtete Geschwindigkeitskomponente erhalten.The direction of rotation of each vortex is determined by the blow-out direction of the associated nozzle (see FIG. 1 b). 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.

Die Absaugöffnungen können sich auch in der Bodenplatte des Abzugs befinden, vorzugsweise dann, wenn häufig mit schweren Gasen gearbeitet wird.The suction openings can also be located in the base plate of the fume cupboard, preferably if heavy gases are frequently used.

Der Abzug kann weiterhin so gestaltet werden, daß die .Wirbelfelder horizontal verlaufen (vgl. Fig. 2), wobei die Absaugöffnungen auf einer, oder auch auf den jeweils gegenüberliegenden Seitenwänden angebracht sind. Die Düsenleisten befinden sich dann in horizontaler Lage über und/oder der Ansaugöffnung mit Aufblasrichtung senkrecht nach unten oder oben.The fume cupboard can also be designed in such a way that the swirl fields run horizontally (cf. FIG. 2), the suction openings being provided on one or on the opposite side walls. The nozzle strips are then in a horizontal position above and / or the suction opening with the direction of inflation vertically downwards or upwards.

Der Abzug kann auch so gestaltet sein, daß durch lediglich eine Absaugöffnung in der Mitte einer Seitenwand in Verbindung mit einer horizontal über oder unter der Ansaugöffnung gelegenen Düsenleiste ein einzelnes Wirbelfeld im Abzug erzeugt wird, auf dessen Achse der Schadstofftransport zur Absaugöffnung hin stattfindet.The fume cupboard can also be designed so that a single swirl field is generated in the fume cupboard by means of only one suction opening in the middle of a side wall in connection with a nozzle bar located horizontally above or below the suction opening, on the axis of which the pollutant transport to the suction opening takes place.

Die Düsenleisten haben etwa rechteckigen oder quadratischen Querschnitt (vgl. Fig. 3) und sind an ihrer vorderen Seite mit einer Austrittsöffnung versehen, die der ganzen Breite der Leiste entspricht. Die Austrittsöffnung wird durch einen Strömungswiderstand z. B. ein Metalltuch, überspannt. Um eine gleichmäßige Geschwindigkeitsverteilung der aus der Leiste auströmenden Luft zu erhalten, befindet sich im Düsenkörper eine schräg angestellte Platte derart, daß der Düsenquerschnitt stromabwärts für die Zuluft stetig verkleinert wird.The nozzle strips have an approximately rectangular or square cross section (cf. FIG. 3) and are provided on their front side with an outlet opening which corresponds to the entire width of the strip. The outlet opening is z. B. spanned a metal cloth. In order to obtain a uniform speed distribution of the air flowing out of the bar, there is an inclined plate in the nozzle body in such a way that the nozzle cross section downstream for the supply air is steadily reduced.

Eine Verbesserung der Einströmverhältnisse im Abzug läßt sich dadurch erreichen, daß im Bodenbereich des Abzugs der dort entstehenden Grenzschicht eine Richtung in den.Abzug hinein aufgeprägt wird. Dies geschieht durch ein Anwinkeln des unteren Teils der Düsenleiste derart, daß die im oberen Teil rechteckige Form in eine Trapezform übergeht (Fig. 4). Da die Luft senkrecht zur Ebene des über die Leiste gespannten Metalltuchs austritt (Fig. 4 b), ergibt sich somit eine unterschiedliche Auströmrichtung zwischen oberem und unterem Teil der Düsenleiste. Die Ausströmrichtung des unteren Düsenteils muß dabei in den Innenraum des Abzugs gerichtet sein. Diese Aufteilung der Düse fordert eine getrennte Luftzuführung für den oberen und unteren Düsenteil und wird durch einen Schlitz zwischen Düsenrückwand und der im oberen Teil der Düse befindlichen, schräg angestellten Platte erreicht.An improvement in the inflow conditions in the fume cupboard can be achieved by embossing a direction into the fume cupboard in the bottom area of the fume cupboard of the boundary layer formed there. This is done by angling the lower part of the nozzle strip in such a way that the rectangular shape in the upper part changes into a trapezoidal shape (FIG. 4). Since the air exits perpendicularly to the plane of the metal sheet stretched over the bar (FIG. 4 b), this results in a different outflow direction between the upper one and lower part of the nozzle bar. The outflow direction of the lower nozzle part must be directed into the interior of the fume cupboard. This division of the nozzle requires a separate air supply for the upper and lower nozzle part and is achieved through a slot between the rear wall of the nozzle and the sloping plate located in the upper part of the nozzle.

Eine Verbesserung der Geschwindigkeitsverteilung im Sinne einer Vergleichmäßigung über die gesamte Frontfläche der Düse, läßt sich durch eine rauhe Oberfläche der in der Düse schräg angestellten Platte erzielen (z. B. Filzbelag, Filtermatten). Dies wirkt sich vorteilhaft auf die Ausbildung der Wirbelfelder aus.An improvement in the speed distribution in the sense of an equalization over the entire front surface of the nozzle can be achieved by a rough surface of the plate inclined in the nozzle (e.g. felt covering, filter mats). This has an advantageous effect on the formation of the swirl fields.

Eine Stabilisierung der Wirbel sowie eine verbesserte Absaugung schwerer Gase im Bodenbereich kann dadurch erreicht werden, daß in der Mitte der rückwärtigen Abzugswand ein vertikaler Schlitz mit ca. 4 mm Breite und 100 mm Höhe angebracht wird, der mit dem Absaugrohr verbunden ist (vgl. Anspruch 8).A stabilization of the vortex and an improved extraction of heavy gases in the floor area can be achieved in that a vertical slot with a width of approx. 4 mm and a height of 100 mm is made in the middle of the rear exhaust wall, which is connected to the extraction pipe (cf. claim 8th).

Die Luftzuführung für die Düsenleisten kann für jeden Düsenkörper getrennt, aber auch durch eine gemeinsame Leitung (13) durchgeführt werden, die eine Verzweigung für die links-und rechtsseitige Düse haben muß. Um eine gleichmäßige Wirbelverteilung im Abzug zu erhalten, muß die Verzweigung so gestaltet werden, daß durch einen Schieber (oder Keil) die Luftmengen der gegenüberliegenden Düsenleisten bei Montage des Abzuges eingestellt werden können.The air supply for the nozzle strips 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. 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 mounted using a slide (or wedge).

Claims (7)

1) Abzug zur Absaugung von Gasen, Dämpfen und Schwebstoffen, insbesondere Laborabzug, bestehend aus einem Abzugsgehäuse, einer Einrichtung zur Versorgung mit Zuluft, einer oder mehrerer Absaugöffnungen, wobei die Zuluft entweder zu 100 % oder nur teilweise aus der Raumluft genommen wird z. B. durch eine Rohrverbindung des Abzugsgehäuses mit der Außenluft, dadurch gekennzeichnet, daß im Bereich der vorderen Ansaugöffnung mindestens eine Düsenleiste (1) für Zuluft vorgesehen ist, deren Austrittsöffnung in der Ebene der vorderen Ansaugöffnung ausgerichtet ist, daß mindestens eine Absaugöffnung (2) .vorgesehen ist, die derart im Abzugsgehäuse angeordnet ist, daß sie in Richtung der Achse (3) der sich einstellenden Wirbelströmung absaugt.1) Deduction for the extraction of gases, vapors and suspended matter, in particular laboratory fume cupboard, consisting of a fume cupboard, a device for supplying supply air, one or more suction openings, with the supply air either being taken 100% or only partially from the room air, e.g. B. by a pipe connection of the fume cupboard with the outside air, characterized in that at least one nozzle strip (1) for supply air is provided in the region of the front intake opening, the outlet opening of which is aligned in the plane of the front intake opening, that at least one exhaust opening (2). is provided, which is arranged in the trigger housing so that it sucks in the direction of the axis (3) of the vortex flow. 2) Abzug nach Anspruch 1, dadurch gekennzeichnet, daß zwei Absaugöffnungen (2) an der Deckplatte (4) angeordnet sind, daß zwei vertikal an den Seitenwänden angeordnete Düsenleisten (1) vorgesehen und die Austrittsöffnungen der Düsenleisten (1) gegeneinander gerichtet sind.2) Trigger according to claim 1, characterized in that two suction openings (2) are arranged on the cover plate (4), that two vertically arranged nozzle strips (1) are provided and the outlet openings of the nozzle strips (1) are directed towards each other. 3) Abzug nach Anspruch 1, dadurch gekennzeichnet, daß die Absaugöffnungen (2) an der Bodenplatte (5) angeordnet sind.3) Trigger according to claim 1, characterized in that the suction openings (2) are arranged on the base plate (5). 4) Abzug nach Anspruch 1, dadurch gekennzeichnet, daß die Absaugöffnungen (2) an den Seitenwänden (6) angeordnet sind, und daß Düsenleisten (1) an der oberen und/oder unteren Frontöffnung angeordnet sind (Fig. 2).4) trigger according to claim 1, characterized in that the suction openings (2) are arranged on the side walls (6), and that nozzle strips (1) are arranged at the upper and / or lower front opening (Fig. 2). 5) Abzug nach Anspruch 1 bis 4, dadurch gekennzeichnet, daß die Düsenleiste (1) aus einem Düsengehäuse (8) mit etwa rechteckigem Querschnitt besteht, daß die vordere Seite (7) als Austrittsöffnung ausgebildet ist, die mit einem großflächigen Strömungswiderstand, z. B. einem Drahtgewe- be abgedeckt ist, daß im Düsengehäuse (8) eine Platte (9) angeordnet ist, die den Düsenquerschnitt, beginnend bei der Eintrittsöffnung (10) für die Zuluft stetig verkleinert (Fig. 3). 6) Abzug nach Anspruch 1 bis 4, dadurch gekennzeichnet, daß die Düsenleiste (1) im oberen Bereich einen etwa rechteckigen Querschnitt aufweist, daß die vordere Seite (7) als Austrittsöffnung ausgebildet ist, die mit einem großflächigen Strömungwiderstand abgedeckt ist, daß im Düsengehäuse (8) eine Platte (9).angeordnet ist, die den Düsenquerschitt im oberen Bereich stetig verkleinert, daß im unteren Bereich der Quer--schnitt trapezförmig ist, derart, daß die Austrittsöffnung (7') einen Winkel gegenüber der Austrittsöffnung (7) aufweist, und daß die Zuluft für die Austrittsöffnung (7') durch einen Schlitz (11) zwischen Platte (9) und Düsenrückwand geleitet wird.5) Trigger according to claim 1 to 4, characterized in that the nozzle bar (1) consists of a nozzle housing (8) with an approximately rectangular cross-section, that the front side (7) is designed as an outlet opening with a large flow resistance, for. B. a wire g EWE be covered, that in the nozzle housing (8) comprises a plate (9) is arranged, which continuously reduces the nozzle cross-section, starting at the inlet opening (10) for the supply air (FIG. 3). 6) Trigger according to claim 1 to 4, characterized in that the nozzle bar (1) has an approximately rectangular cross-section in the upper region, that the front side (7) is designed as an outlet opening, which is covered with a large-area flow resistance, that in the nozzle housing (8) a plate (9) is arranged which steadily reduces the nozzle cross section in the upper area so that the cross section is trapezoidal in the lower area, in such a way that the outlet opening (7 ') forms an angle with respect to the outlet opening (7) and that the supply air for the outlet opening (7 ') is passed through a slot (11) between the plate (9) and the rear wall of the nozzle. 7) Abzug nach Anspruch 5 und 6, dadurch gekennzeichnet, daß die Platte (9) eine rauhe Oberfläche, z. B. einen Filzbelag, aufweist.7) trigger according to claim 5 and 6, characterized in that the plate (9) has a rough surface, for. B. has a felt covering. 8) Abzug nach Anspruch 1 bis 7, dadurch gekennzeichnet; daß in der Mitte der rückwärtigen Abzugswand ein vertikaler Schlitz (12) vorgesehen ist, der sich über der Bodenplatte (5) befindet und sich über ca. 10 % der Abzugshöhe erstreckt.8) Deduction according to claim 1 to 7, characterized; that a vertical slot (12) is provided in the middle of the rear exhaust wall, which is located above the base plate (5) and extends over approximately 10% of the trigger height.
EP83101890A 1982-03-10 1983-02-25 Fume hood Expired - Lifetime EP0088313B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83101890T ATE16571T1 (en) 1982-03-10 1983-02-25 VENTILATION FOR EXTRACTION OF GASES, FUMES AND PARTICULATE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3208622A DE3208622C1 (en) 1982-03-10 1982-03-10 Deduction for extracting gases, vapors and suspended matter
DE3208622 1982-03-10

Publications (3)

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

Family

ID=6157834

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83101890A Expired - Lifetime EP0088313B2 (en) 1982-03-10 1983-02-25 Fume hood

Country Status (7)

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

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2619733A1 (en) * 1987-08-27 1989-03-03 Rhone Poulenc Ind Working fume cupboard, especially for laboratories
EP2277635A3 (en) * 2009-07-20 2012-12-26 Kjellberg Finsterwalde Plasma und Maschinen GmbH Suction method and device

Families Citing this family (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3232203C2 (en) * 1982-08-30 1985-04-18 Heinrich Dipl.-Ing. 5205 St Augustin Hilbers Method and device for the suction and removal of pollutants in laboratories or the like.
DE3431669A1 (en) * 1984-08-29 1986-03-13 Müller, Johannes, 5202 Hennef Laboratory extractor (fume cupboard) and extraction process with supply air feed
DE3604422A1 (en) * 1986-02-13 1987-08-20 Kessler & Luch Gmbh DEVICE FOR CLEANING CONTAMINATED SURFACES BY MEANS OF FLOWING AIR
JPH0248770Y2 (en) * 1986-05-29 1990-12-20
JPH0665935B2 (en) * 1987-07-10 1994-08-24 日本エアーカーテン株式会社 Double tornado air conditioning ventilation system
JPH01137136A (en) * 1987-11-25 1989-05-30 Nippon Air Curtain Kk Artificial tornado air conditioning and ventilation mechanism
JPH01300145A (en) * 1988-05-26 1989-12-04 Japan Air Curtain Corp Local discharging device of artificial tornado type
DK312288D0 (en) * 1988-06-08 1988-06-08 Hansen & Raagaard Aps PROCEDURE AND EQUIPMENT FOR MECHANICAL ITEM EXTENSION
JPH02208435A (en) * 1989-02-07 1990-08-20 Japan Air Curtain Corp Artificial tornado producing mechanism and its device
WO1990011009A1 (en) * 1989-03-29 1990-10-04 Airchitect I Söderhamn Ab Air conditioning unit for laboratory animals
US5059079A (en) * 1989-05-16 1991-10-22 Proconics International, Inc. Particle-free storage for articles
JPH0331242U (en) * 1989-07-31 1991-03-27
DE9418235U1 (en) * 1994-11-14 1995-01-05 MMM Medcenter Einrichtungen GmbH, 82152 Planegg Device, in particular an oven
US6089970A (en) * 1997-11-24 2000-07-18 The Regents Of The University Of California Energy efficient laboratory fume hood
AU5962000A (en) * 1999-05-19 2000-12-05 Georg Emanuel Koppenwallner Method and device for localising, detecting and suctioning liquid media
DE19957962B4 (en) * 1999-05-19 2009-01-29 Röhl-Hager, Hannelore Method and apparatus for confining, capturing and exhausting fluid media
WO2001044724A1 (en) 1999-12-14 2001-06-21 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 (en) 2006-07-27 2008-01-28 Electrolux Professional Spa SUCTION HOOD WITH PERFECT VENTILATION
TWI426220B (en) * 2011-03-22 2014-02-11 Univ Nat Taiwan Science Tech An exhaust device with a flap plate
KR101934457B1 (en) * 2011-11-17 2019-01-04 삼성전자주식회사 Ventilation apparatus and ventilation system having the same
US9541296B2 (en) * 2014-05-22 2017-01-10 National Taiwan University Of Science And Technology Soot-exhausting device
DE202017002012U1 (en) * 2016-05-17 2017-08-21 Brand Gmbh + Co Kg Housing for a laboratory device

Citations (2)

* 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
DE2659736A1 (en) * 1976-01-02 1977-07-07 Eakes Co M L EXTRACTION DEVICES FOR MACHINERY

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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 (en) * 1964-11-07 1969-02-27 Siemens Elektrogeraete Gmbh Device for extracting air with undesired admixtures
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 (en) * 1967-03-11 1967-10-31 Krantz H Fa Chapel for chemistry laboratories
US3747505A (en) * 1972-02-18 1973-07-24 American Hospital Supply Corp Air flow system for fume hood
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

Patent Citations (2)

* 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
DE2659736A1 (en) * 1976-01-02 1977-07-07 Eakes Co M L EXTRACTION DEVICES FOR MACHINERY

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2619733A1 (en) * 1987-08-27 1989-03-03 Rhone Poulenc Ind Working fume cupboard, especially for laboratories
EP2277635A3 (en) * 2009-07-20 2012-12-26 Kjellberg Finsterwalde Plasma und Maschinen GmbH Suction method and device

Also Published As

Publication number Publication date
NO830828L (en) 1983-09-12
DK116283D0 (en) 1983-03-10
EP0088313B1 (en) 1985-11-21
NO161897B (en) 1989-07-03
ATE16571T1 (en) 1985-12-15
EP0088313B2 (en) 1991-06-19
US4622888A (en) 1986-11-18
JPS58223444A (en) 1983-12-26
US4550650A (en) 1985-11-05
DK116283A (en) 1983-09-11
NO161897C (en) 1989-10-11
JPH035852B2 (en) 1991-01-28
DE3208622C1 (en) 1983-12-15

Similar Documents

Publication Publication Date Title
EP0088313B1 (en) Fume hood
EP0042597A2 (en) Air distributing arrangement
DE4332050A1 (en) Ventilation device and ventilation method
DE3404775C1 (en) Bench extractor cabinet for operations involving pollutants and for energy-saving ventilation
DE2758348C2 (en) Ventilation device for a fume cupboard on laboratory tables
DE69207056T2 (en) Method and device for ventilation of a treatment room
DE69108015T2 (en) PORTABLE HIGH PRESSURE CLEANER.
EP0687512A2 (en) Safety laboratory hood cupboard
EP0337469A2 (en) Clean room cupboard
DE202018105102U1 (en) fume hood
DE2214889A1 (en) Ventilation system
DE8206658U1 (en) Fume hood for the extraction of gases, vapors and suspended matter
AT408482B (en) DEVICE FOR PREVENTING THE MIXING OF TWO AIR FLOWS
EP1846699A1 (en) Kitchen vapor aspiration device
DE3242918C2 (en)
DE3127680A1 (en) Self-aerated extractor
EP0070870A1 (en) Device for sucking a paint mist.
DE20008641U1 (en) Device for air conditioning a room
DE2900575A1 (en) Laboratory ventilation system - with one branch along extn. cabinet panel and other down the centre line
DE3832915A1 (en) Clean room
AT207088B (en) Screening of room openings with an air curtain
DE19801762B4 (en) vacuum cleaner
DE3323319C2 (en)
DE3711376A1 (en) Air-outflow channel of a dedusting device of a textile machine
DE3626393C2 (en) Air filtering arrangement for motor vehicles

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): AT BE CH FR GB IT LI LU NL SE

17P Request for examination filed

Effective date: 19831007

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Designated state(s): AT BE CH FR GB IT LI LU NL SE

REF Corresponds to:

Ref document number: 16571

Country of ref document: AT

Date of ref document: 19851215

Kind code of ref document: T

ITF It: translation for a ep patent filed

Owner name: STUDIO TORTA SOCIETA' SEMPLICE

ET Fr: translation filed
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19860228

PLBI Opposition filed

Free format text: ORIGINAL CODE: 0009260

26 Opposition filed

Opponent name: AB BAHCO VENTILATION

Effective date: 19860820

NLR1 Nl: opposition has been filed with the epo

Opponent name: AB BAHCO VENTILATION

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: LU

Payment date: 19900228

Year of fee payment: 8

PUAH Patent maintained in amended form

Free format text: ORIGINAL CODE: 0009272

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: PATENT MAINTAINED AS AMENDED

27A Patent maintained in amended form

Effective date: 19910619

AK Designated contracting states

Kind code of ref document: B2

Designated state(s): AT BE CH FR GB IT LI LU NL SE

REG Reference to a national code

Ref country code: CH

Ref legal event code: AEN

ET3 Fr: translation filed ** decision concerning opposition
NLR2 Nl: decision of opposition
ITF It: translation for a ep patent filed

Owner name: STUDIO TORTA SOCIETA' SEMPLICE

NLR3 Nl: receipt of modified translations in the netherlands language after an opposition procedure
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 19930226

Year of fee payment: 11

Ref country code: FR

Payment date: 19930226

Year of fee payment: 11

ITTA It: last paid annual fee
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19940226

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Effective date: 19941031

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

EUG Se: european patent has lapsed

Ref document number: 83101890.8

Effective date: 19940910

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: BE

Payment date: 19950314

Year of fee payment: 13

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 19950327

Year of fee payment: 13

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19960126

Year of fee payment: 14

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: AT

Payment date: 19960227

Year of fee payment: 14

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19960228

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19960228

Ref country code: BE

Effective date: 19960228

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 19960229

Year of fee payment: 14

BERE Be: lapsed

Owner name: WALDNER LABOREINRICHTUNGEN G.M.B.H & CO.

Effective date: 19960228

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19970225

Ref country code: AT

Effective date: 19970225

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Effective date: 19970901

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19970225

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee

Effective date: 19970901