EP1444057B1 - Fume cupboard - Google Patents

Fume cupboard Download PDF

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Publication number
EP1444057B1
EP1444057B1 EP02754996A EP02754996A EP1444057B1 EP 1444057 B1 EP1444057 B1 EP 1444057B1 EP 02754996 A EP02754996 A EP 02754996A EP 02754996 A EP02754996 A EP 02754996A EP 1444057 B1 EP1444057 B1 EP 1444057B1
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EP
European Patent Office
Prior art keywords
air
fume cupboard
working chamber
cupboard according
side walls
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP02754996A
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German (de)
French (fr)
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EP1444057A1 (en
EP1444057B8 (en
Inventor
Ulrich Gärtner
Jürgen Liebsch
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
Waldner Laboreinrichtungen GmbH and Co KG
Original Assignee
Waldner Laboreinrichtungen GmbH and Co
Waldner Laboreinrichtungen GmbH and Co KG
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Application filed by Waldner Laboreinrichtungen GmbH and Co, Waldner Laboreinrichtungen GmbH and Co KG filed Critical Waldner Laboreinrichtungen GmbH and Co
Publication of EP1444057A1 publication Critical patent/EP1444057A1/en
Publication of EP1444057B1 publication Critical patent/EP1444057B1/en
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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 trigger with a housing in which there is a working space which is open on one side.
  • US 3,747,505 discloses a trigger that outputs compressed air jets in the area of the front edge of the worktop and in the region of the side walls.
  • the air jets emitted in the area of the side walls are free jets that form an air curtain intended to prevent the escape of toxic vapors from the working space due to existing backflow in the area of the side walls.
  • GB 2064100A discloses a generic deduction, in which compressed air jets are issued through an opening in the worktop in the form of directed upward and to the left directional free jets in the deduction interior.
  • US 5,924,920 and GB 2336667A reveal a trigger with a arranged at a distance from the front edge of the worktop baffle and arranged at a distance from the side post baffle. Room air is sucked into the working space through the respectively provided gap.
  • the object underlying the invention is therefore to provide a trigger of the type mentioned in such a way that an accumulation of pollutants on the side walls and the bottom of the working space in the housing is avoided.
  • This object is achieved according to the invention by arranged on the open side of the working space facilities that emit fresh air jets at an acute angle to the inner surface of the housing side walls and the housing bottom surface in the housing interior.
  • the in Fig. 1 shown deduction consists of a housing 1 with a bottom or a table top 2, which encloses the working space 3 of the trigger on all sides except for a closable by a sliding window 9 opening.
  • Baffle 4 extends over the rear wall of the trigger in the working space 3. Between the baffle 4 and housing walls openings 5a, b, c and d are provided and located behind the baffle 4 chamber is sucked off via a collecting channel 6, which is connected to an exhaust system 7 ,
  • the side posts of the housing 1 of the trigger are designed as aerodynamically shaped aluminum posts 8, preferably as aircraft wing-like profile part with forward facing inflow, wherein the sliding window 9 has a correspondingly flow-shaped Einströmprofilteil 10.
  • the front edge of the table top 2 also consists of a flow-shaped inflow profile 11, which may also be an aircraft wing-like profile part with forward facing inflow.
  • a Zu Kunststoffstutzen 12 is arranged, from the supply air in the trigger, that is blown into the working space 3.
  • This supply air can come from the outside or from an on-site supply air network.
  • the amounts of injected air are controlled by a regulator 13, which consists of a differential pressure or flow sensor, a control valve, a motor and a central electronic control unit, blown into a distribution collection channel 14 and introduced through a Zu Kunststoffdüse 15 in the working space 3, the a chamber bounded by the surface portions 16 and 16a.
  • a deflection profiles 17, which direct a free jet 18 inwardly into the working space 3 of the trigger In the lower region of the chamber, which is formed like a nozzle, there are deflection profiles 17, which direct a free jet 18 inwardly into the working space 3 of the trigger.
  • the inflow 11 is formed at the front edge of the table top 2 so that on both sides in each case an air jet 22 is blown obliquely at an acute angle to the bottom surface in the housing interior such that this air jet 22nd is deflected by the incoming air to the table top and along the table top to the opening 5b between the baffle 4 and the back of the trigger along.
  • the profile parts of the side posts 8 are formed so that they output support jets 21 in the housing interior, which are also blown at an acute angle to the inner surfaces of the side walls of the housing.
  • Fig. 2 which is a sectional view of the trigger along the line AA in Fig. 1 shows the course of the air jets 21, 22 in detail. That is, from the tread part forming the side posts 8, air jets 21 emerge at an acute angle to the inner surfaces of the side walls which are applied to the side walls by the inflowing air and pass into the exhaust ports 5d and 5e. In addition, from the leading edge profile 11, a supply air veil formed from a plurality of air jets 22 flows over the table top 2.
  • Fig. 3 shows the table top 2 and the inflow 11 at its front edge in detail.
  • the profile part 11 is formed as a hollow profile and flows through an air port 24 air in the profile part 11. This air escapes through milling 23, for example in the form of slots or nozzles such that einblasender at an acute angle into the interior of the trigger Air jet 22 is formed, which rests against the surface of the table top 2.
  • Fig. 4 shows accordingly a profile of the side posts 8, which is also formed as a hollow chamber profile. Air flowing through an opening or nozzle 26 at an acute angle in the working space 3 of the trigger, then applies to the inner surface of the side part 27 at.
  • the means for generating the additional air jets 21, 22 may be provided at a distance from the Profilanströmseite or directly behind the Profilanströmseite the profile parts 8, 11.
  • Fig. 5 shows the upper area of the trigger and in particular the Zu Kunststoff Surprise. As it is in Fig. 5 is shown, the supply air via a supply fan or another fan, is divided by a pressure chamber 28 and is blown through a nozzle as a free steel 18 in the working space 3 of the trigger, which consists of the sides of the housing and the two parts 16 and 16a of the already mentioned Chamber exists.
  • deflection profiles 17 are provided, which are formed so that the free-steel is first curved by the nozzle and then deflected inwards, so that it flows together with the impulse from the outside. Air at an angle of 45 ° to the vertical flows inward into the working space 3 of the trigger. This supply air combines with the air flowing into the working space 3 from the outside.
  • Fig. ' 6A and 6B show the effect of the air jets 22 in detail. The same applies to the air jets 21st
  • Fig. 6A shows that the incoming air 30 abuts the Einströmprofil at the front edge of the table top 2 but does not approach the table top surface, so that there is a backflow 31, flows into the air from the interior of the working space 3 of the trigger to the tear-off edge and in the This can accumulate pollutants.
  • This training has particular in the work with heavy gases have the advantage that they sink to the surface of the table top and disappear through the backward flow component directly to the lower suction opening 5b of the working space 3.
  • Possible dimensions of the two lateral air jets 21 are such that they make up about 15 to 20 m 3 / h.
  • the lower air jet 22 has an air volume of 10 m 3 / h per 1fd. Meter.
  • the air speed is 2m per second.
  • the deflection angle of the air jets 21, 22 is preferably about 20 °, so that they flow at an acute angle to the inner surfaces in the working space 3.
  • the upper free jet 18 on the deflection profile 17 is not hinged to a wall, but blown in the form of a free jet in front of the room. He therefore requires a much higher air flow of about 100 to 150 m 3 / h per running meter deduction width.
  • a fume hood with a width of 1,500 mm therefore has a free jet of 150 m 3 / h and wall blasting of about 50 to 60 m 3 / h.
  • the training is such that when the sash open the trigger sucks 900 m 3 / h and all wall and support beams are generated.
  • the free jet 18 When closing the sliding window 9, the free jet 18 is switched off at the deflection profile 17, so that the trigger can be lowered with the sliding window closed to about 150 m 3 / h air requirement. It is therefore recommended operate the trigger with a control that measures the position of the vertical sliding window 9. Opens the vertical sliding window 9 by more than 50% then the free jet 18 is turned on the deflection profile 17. The same applies even if the horizontal sliding window of the trigger opens more than 10 to 20 mm. Otherwise the free jet 18 is switched off.
  • the wall jets 21, 22 may be switched off, so that the trigger can be driven depending on the needs always with a small amount of air, which is a clear advantage over a conventional veil trigger.
  • the exhaust air amount is then 100 m 3 / h.
  • the support beams Since the support beams have a significant influence on the function of the trigger, they must be continuously tested and monitored in the course of the required monitoring of the ventilation function of the trigger. This monitoring can be carried out with a differential pressure sensor in the overpressure area of the injection. In case of malfunction, an alarm is issued.
  • the above-described embodiment of the trigger according to the invention shows a high stability with respect to a lateral or oblique flow, in that a dead space area on the take-off surfaces or on the trigger slides is prevented. It is also taken care of for a very good extraction of heavy gases, as these fall to the table top 2 and are blown through the additional air jet 22 in the opening 5b.
  • the free jet 18 on the deflection profile 17 ensures that light gases which form in the working space 3 above above this support jet 18 are reliably held in the upper area of the fume hood and do not contaminate the lower working area can.
  • the inventive construction are generated in the additional air jets 21, 22, 18, with the trigger control be linked so that the trigger can be operated with the least possible amount of air.

Landscapes

  • Ventilation (AREA)
  • Devices For Use In Laboratory Experiments (AREA)
  • Centrifugal Separators (AREA)
  • Duct Arrangements (AREA)
  • Devices Affording Protection Of Roads Or Walls For Sound Insulation (AREA)
  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
  • Air-Flow Control Members (AREA)

Abstract

The fume cupboard has a housing enclosing working chamber (3) which is open on one side, with air jets (21,22) directing additonal air onto the inner surfaces of the housing base (3) and lateral sides, the air jets following the contour of the inner surfaces. The side posts (8) and the front edge (11) of the working chamber can be provided as flow profiles incorporating air jet devices

Description

Die Erfindung betrifft einen Abzug mit einem Gehäuse, in dem sich ein Arbeitsraum befindet, der an einer Seite offen ist.The invention relates to a trigger with a housing in which there is a working space which is open on one side.

Abzüge dieser Art sind allgemein bekannt und auf dem Markt erhältlich. Sie unterliegen bestimmten Normen bezüglich eines möglichen Schadstoffaustritts.Deductions of this type are well known and available on the market. They are subject to certain standards regarding a possible emission of pollutants.

Hierzu ist es aus der DE 19712975 A1 bekannt, die Ausbruchsicherheit von Abzügen über Luftschleier zu erhöhen, die quer zur Öffnung des Arbeitsraumes insbesondere von der Unterseite nach oben geblasen werden. Hierdurch ist es zwar möglich, die Ausbruchssicherheit gegenüber Störungen von außen zu verbessern, es kann jedoch nicht verhindert werden, daß sich beispielsweise schwere Gase am Boden des Arbeitsraumes oder leichte Gase oberhalb der Öffnung des Arbeitsraumes ansammeln.For this it is from the DE 19712975 A1 known to increase the escape safety of fumes over air curtain, which are blown transversely to the opening of the working space in particular from the bottom up. Although this makes it possible to improve the escape safety against external disturbances, it can not be prevented that, for example, heavy gases at the bottom of the working space or collect light gases above the opening of the working space.

US 3,747,505 offenbart einen Abzug, der Druckluftstrahlen im Bereich der Vorderkante der Arbeitsplatte und im Bereich der Seitenwände ausgibt. Bei den im Bereich der Seitenwände ausgegebenen Luftstrahlen handelt es sich um Freistrahlen, die einen Luftschleier bilden, durch den der Austritt toxischer Dämpfe aus dem Arbeitsraum aufgrund existierender Rückströmungen im Bereich der Seitenwände verhindert werden soll. US 3,747,505 discloses a trigger that outputs compressed air jets in the area of the front edge of the worktop and in the region of the side walls. The air jets emitted in the area of the side walls are free jets that form an air curtain intended to prevent the escape of toxic vapors from the working space due to existing backflow in the area of the side walls.

Der im Prospekt "asecos", Ausgabe April 2001, beschriebene Abzug gibt im Bereich der Vorderkante der Arbeitsplatte und im Bereich der Decke Luftstrahlen aus, die einen Luftschleier bilden, der den Austritt gefährlicher Dämpfe verhindern soll.The trigger described in the brochure "asecos", April 2001 issue, in the area of the front edge of the worktop and in the area of the ceiling, air jets that form an air curtain intended to prevent the escape of dangerous vapors.

GB 2064100A offenbart einen gattungsgemäßen Abzug, bei dem Druckluftstrahlen durch eine Öffnung in der Arbeitsplatte in Form von nach ober und nach linten gerichtete Freistrahlen in den Abzuginnenraum ausgegeben werden. GB 2064100A discloses a generic deduction, in which compressed air jets are issued through an opening in the worktop in the form of directed upward and to the left directional free jets in the deduction interior.

US 5,924,920 und GB 2336667A offenbaren einen Abzug mit einem im Abstand zur Vorderkante der Arbeitsplatte angeordneten Leitblech und einem im Abstand zum Seitenpfosten angeordneten Leitblech. Durch den jeweils vorgesehenen Spalt wird Raumluft in den Arbeitsraum eingesaugt. US 5,924,920 and GB 2336667A reveal a trigger with a arranged at a distance from the front edge of the worktop baffle and arranged at a distance from the side post baffle. Room air is sucked into the working space through the respectively provided gap.

Die der Erfindung zugrunde liegende Aufgabe besteht daher darin, einen Abzug der eingangs genannten Art so auszugestalten, daß eine Ansammlung von Schadstoffen an den Seitenwänden und dem Boden des Arbeitsraumes im Gehäuse vermieden wird.The object underlying the invention is therefore to provide a trigger of the type mentioned in such a way that an accumulation of pollutants on the side walls and the bottom of the working space in the housing is avoided.

Diese Aufgabe wird gemäß der Erfindung durch an der offenen Seite des Arbeitsraumes angeordnete Einrichtungen gelöst, die Frischluftstrahlen unter einem spitzen Winkel zur Innenfläche der Gehäuseseitenwände und der Gehäusebodenfläche in das Gehäuseinnere ausgeben.This object is achieved according to the invention by arranged on the open side of the working space facilities that emit fresh air jets at an acute angle to the inner surface of the housing side walls and the housing bottom surface in the housing interior.

Besonders bevorzugte Weiterbildungen und Ausgestaltungen des erfindungsgemäßen Abzugs sind Gegenstand der Ansprüche 2 bis 14.Particularly preferred developments and refinements of the trigger according to the invention are the subject matter of claims 2 to 14.

Im folgenden wird anhand der zugehörigen Zeichnung ein besonders bevorzugtes Ausführungsbeispiel der Erfindung näher beschrieben. Es zeigen

  • Fig. 1 eine Längsschnittansicht des Ausführungsbeispiels,
  • Fig. 2 eine Querschnittsansicht des in Fig. 1 dargestellten Ausführungsbeispiels längs der Linie A-A,
  • Fig. 3 eine Seitenansicht des Vorderkantenprofils des Ausführungsbeispiels,
  • Fig. 4 eine Seitenansicht des Seitenpfostenprofils des Ausführungsbeispiels,
  • Fig. 5 die Zulufteinrichtung des Ausführungsbeispiels im einzelnen und
  • Fig. 6A und 6B die Wirkung der erfindungsgemäßen Ausbildung hinsichtlich der Verringerung der Gefahr eines Schadstoffausbruchs.
In the following, a particularly preferred embodiment of the invention will be described with reference to the accompanying drawings. Show it
  • Fig. 1 a longitudinal sectional view of the embodiment,
  • Fig. 2 a cross-sectional view of in Fig. 1 illustrated embodiment along the line AA,
  • Fig. 3 a side view of the leading edge profile of the embodiment,
  • Fig. 4 a side view of the side post profile of the embodiment,
  • Fig. 5 the Zulufteinrichtung the embodiment in detail and
  • FIGS. 6A and 6B the effect of the training according to the invention in terms of reducing the risk of pollutant outbreak.

Der in Fig. 1 dargestellte Abzug besteht aus einem Gehäuse 1 mit einem Boden oder einer Tischplatte 2, das bis auf eine durch ein Schiebefenster 9 verschließbare Öffnung den Arbeitsraum 3 des Abzuges allseits umschließt. EineThe in Fig. 1 shown deduction consists of a housing 1 with a bottom or a table top 2, which encloses the working space 3 of the trigger on all sides except for a closable by a sliding window 9 opening. A

Prallwand 4 verläuft über die Rückwand des Abzuges im Arbeitsraum 3. Zwischen der Prallwand 4 und Gehäusewänden sind Öffnungen 5a, b, c und d vorgesehen und die hinter der Prallwand 4 befindliche Kammer wird über einen Sammelkanal 6 abgesaugt, der an ein Abluftsystem 7 angeschlossen ist.Baffle 4 extends over the rear wall of the trigger in the working space 3. Between the baffle 4 and housing walls openings 5a, b, c and d are provided and located behind the baffle 4 chamber is sucked off via a collecting channel 6, which is connected to an exhaust system 7 ,

Die Seitenpfosten des Gehäuses 1 des Abzuges sind als strömungstechnisch geformte Aluminiumpfosten 8, vorzugsweise als flugzeugtragflächenartiges Profilteil mit nach vorne gerichteter Anströmfläche ausgebildet, wobei das Schiebefenster 9 ein strömungstechnisch entsprechend geformtes Einströmprofilteil 10 aufweist. Die Vorderkante der Tischplatte 2 besteht gleichfalls aus einem strömungstechnisch geformten Einströmprofil 11, das gleichfalls ein flugzeugtragflächenartiges Profilteil mit nach vorne gerichteter Anströmfläche sein kann.The side posts of the housing 1 of the trigger are designed as aerodynamically shaped aluminum posts 8, preferably as aircraft wing-like profile part with forward facing inflow, wherein the sliding window 9 has a correspondingly flow-shaped Einströmprofilteil 10. The front edge of the table top 2 also consists of a flow-shaped inflow profile 11, which may also be an aircraft wing-like profile part with forward facing inflow.

Über dem Abzug ist ein Zuluftstutzen 12 angeordnet, aus dem Zuluft in den Abzug, d. h. in den Arbeitsraum 3 eingeblasen wird. Diese Zuluft kann aus dem Außenraum oder aus einem bauseitigen Zuluftnetz stammen. Die Mengen der eingeblasenen Luft werden über einen Regler 13 geregelt, der aus einem Differenzdruck- oder Strömungssensor, einer Regelklappe, einem Motor und einer zentralen elektronischen Regeleinheit besteht, in einen Verteilungssammelkanal 14 eingeblasen und durch einen Zuluftdüse 15 in den Arbeitsraum 3 eingeführt, der aus einer Kammer besteht, die von den Flächenteilen 16 und 16a begrenzt ist. Im unteren Bereich der Kammer, die düsenartig ausgebildet ist, befinden sich Umlenkprofile 17, die einen Freistrahl 18 nach innen in den Arbeitsraum 3 des Abzugs lenken. Die Ausbildung der Zulufteinrichtung wird später im einzelnen anhand von Fig. 5 beschrieben.About the trigger is a Zuluftstutzen 12 is arranged, from the supply air in the trigger, that is blown into the working space 3. This supply air can come from the outside or from an on-site supply air network. The amounts of injected air are controlled by a regulator 13, which consists of a differential pressure or flow sensor, a control valve, a motor and a central electronic control unit, blown into a distribution collection channel 14 and introduced through a Zuluftdüse 15 in the working space 3, the a chamber bounded by the surface portions 16 and 16a. In the lower region of the chamber, which is formed like a nozzle, there are deflection profiles 17, which direct a free jet 18 inwardly into the working space 3 of the trigger. The formation of the Zulufteinrichtung will be discussed later in detail with reference to Fig. 5 described.

Wie es weiterhin in Fig. 1 dargestellt ist, ist das Einströmprofil 11 an der Vorderkante der Tischplatte 2 so ausgebildet, daß auf beiden Seiten jeweils ein Luftstrahl 22 schräg unter einem spitzen Winkel zur Bodenfläche in das Gehäuseinnere geblasen wird derart, daß dieser Luftstrahl 22 durch die einströmende Luft auf die Tischplatte umgelenkt wird und an der Tischplatte bis zur Öffnung 5b zwischen der Prallwand 4 und der Rückseite des Abzugs entlangstreicht.As it continues in Fig. 1 is shown, the inflow 11 is formed at the front edge of the table top 2 so that on both sides in each case an air jet 22 is blown obliquely at an acute angle to the bottom surface in the housing interior such that this air jet 22nd is deflected by the incoming air to the table top and along the table top to the opening 5b between the baffle 4 and the back of the trigger along.

Auch die Profilteile der Seitenpfosten 8 sind so ausgebildet, daß sie Stützstrahlen 21 in das Gehäuseinnere ausgeben, die gleichfalls unter einem spitzen Winkel zu den Innenflächen der Seitenwände des Gehäuses ausgeblasen werden.The profile parts of the side posts 8 are formed so that they output support jets 21 in the housing interior, which are also blown at an acute angle to the inner surfaces of the side walls of the housing.

Aus Fig. 2, die eine Schnittansicht des Abzuges längs der Linie A-A in Fig. 1 zeigt, ist der Verlauf der Luftstrahlen 21, 22 im einzelnen ersichtlich. Das heißt, daß aus dem Profilteil, das die Seitenpfosten 8 bildet, Luftstrahlen 21 unter einem spitzen Winkel zu den Innenflächen der Seitenwände austreten, die durch die nachströmende Luft an die Seitenwände angelegt werden und in die Abzugsöffnungen 5d und 5e gehen. Zusätzlich strömt aus dem Vorderkantenprofil 11 ein aus mehreren Luftstrahlen 22 gebildeter Zuluftschleier über die Tischplatte 2.Out Fig. 2 which is a sectional view of the trigger along the line AA in Fig. 1 shows the course of the air jets 21, 22 in detail. That is, from the tread part forming the side posts 8, air jets 21 emerge at an acute angle to the inner surfaces of the side walls which are applied to the side walls by the inflowing air and pass into the exhaust ports 5d and 5e. In addition, from the leading edge profile 11, a supply air veil formed from a plurality of air jets 22 flows over the table top 2.

Fig. 3 zeigt die Tischplatte 2 und das Einströmprofil 11 an ihrer Vorderkante im einzelnen. Bei dem dargestellten Ausführungsbeispiel ist das Profilteil 11 als Hohlprofil ausgebildet und strömt über einen Luftanschluß 24 Luft in das Profilteil 11. Diese Luft entweicht durch Fräsungen 23, beispielsweise in Form von Schlitzen oder Düsen derart, daß ein im spitzen Winkel in das Innere des Abzug einblasender Luftstrahl 22 entsteht, der sich an die Oberfläche der Tischplatte 2 anlegt. Fig. 3 shows the table top 2 and the inflow 11 at its front edge in detail. In the illustrated embodiment, the profile part 11 is formed as a hollow profile and flows through an air port 24 air in the profile part 11. This air escapes through milling 23, for example in the form of slots or nozzles such that einblasender at an acute angle into the interior of the trigger Air jet 22 is formed, which rests against the surface of the table top 2.

Fig. 4 zeigt dementsprechend ein Profil der Seitenpfosten 8, das gleichfalls als Hohlkammerprofil ausgebildet ist. Luft, die durch eine Öffnung oder Düse 26 im spitzen Winkel in den Arbeitsraum 3 des Abzugs einströmt, legt sich dann an die Innenfläche des Seitenteils 27 an. Fig. 4 shows accordingly a profile of the side posts 8, which is also formed as a hollow chamber profile. Air flowing through an opening or nozzle 26 at an acute angle in the working space 3 of the trigger, then applies to the inner surface of the side part 27 at.

Die Einrichtungen zur Erzeugung der zusätzlichen Luftstrahlen 21, 22 können im Abstand von der Profilanströmseite oder direkt hinter der Profilanströmseite der Profilteile 8, 11 vorgesehen sein.The means for generating the additional air jets 21, 22 may be provided at a distance from the Profilanströmseite or directly behind the Profilanströmseite the profile parts 8, 11.

Fig. 5 zeigt den oberen Bereich des Abzuges und hier insbesondere die Zulufteinrichtung. Wie es in Fig. 5 dargestellt ist, kommt die Zuluft über einen Zuluftventilator oder einen anderen Ventilator, teilt sich über eine Druckkammer 28 und wird über eine Düse als Freistahl 18 in den Arbeitsraum 3 des Abzugs geblasen, die aus den Gehäuseseiten und den beiden Teilen 16 und 16a der bereits erwähnten Kammer besteht. Fig. 5 shows the upper area of the trigger and in particular the Zulufteinrichtung. As it is in Fig. 5 is shown, the supply air via a supply fan or another fan, is divided by a pressure chamber 28 and is blown through a nozzle as a free steel 18 in the working space 3 of the trigger, which consists of the sides of the housing and the two parts 16 and 16a of the already mentioned Chamber exists.

Im unteren Bereich dieser Kammer, d. h. im unteren Bereich der Teile 16 und 16a sind Umlenkprofile 17 vorgesehen, die so ausgebildet sind, daß der Freistahl von der Düse zunächst gekrümmt und dann nach innen umgelenkt wird, so daß er zusammen mit dem Impuls der von außen einströmenden. Luft in einem Winkel von 45° zur Vertikalen nach innen in den Arbeitsraum 3 des Abzugs einströmt. Diese Zuluft vereint sich mit der Luft, die von außen in den Arbeitsraum 3 einströmt.In the lower part of this chamber, d. H. In the lower part of the parts 16 and 16a deflection profiles 17 are provided, which are formed so that the free-steel is first curved by the nozzle and then deflected inwards, so that it flows together with the impulse from the outside. Air at an angle of 45 ° to the vertical flows inward into the working space 3 of the trigger. This supply air combines with the air flowing into the working space 3 from the outside.

Fig.' 6A und 6B zeigen die Wirkung der Luftstrahlen 22 im einzelnen. Entsprechendes gilt auch für die Luftstrahlen 21.Fig. ' 6A and 6B show the effect of the air jets 22 in detail. The same applies to the air jets 21st

Fig. 6A zeigt, daß sich die einströmende Luft 30 an das Einströmprofil an der Vorderkante der Tischplatte 2 anlegt aber nicht an die Tischplattenoberfläche herankommt, so daß sich ein Rückstromgebiet 31 ergibt, in das Luft vom Inneren des Arbeitsraumes 3 des Abzuges bis zur Abrißkante strömt und in dem sich dadurch Schadstoffe ansammeln können. Fig. 6A shows that the incoming air 30 abuts the Einströmprofil at the front edge of the table top 2 but does not approach the table top surface, so that there is a backflow 31, flows into the air from the interior of the working space 3 of the trigger to the tear-off edge and in the This can accumulate pollutants.

Wie es in Fig. 6b dargestellt ist, lehnt sich der zusätzliche Luftstrahl 22 aufgrund der Kraft der in den Abzug einströmenden Luft 30 direkt an die Oberfläche der Tischplatte 2 an bis er in den Öffnungen 5d und 5e verschwindet.As it is in Fig. 6b is shown, the additional air jet 22 leans directly on the surface of the table top 2 due to the force of the incoming air into the hood 30 until it disappears into the openings 5d and 5e.

Bei eingeschalteter Ausblasung der Luftstrahlen an der Tischplatte und an beiden Seiten kann dadurch eine Wandreibung weitgehenst ausgeschaltet werden, so daß die Luft über die gesamte Fläche des Arbeitsraumes 3 nach innen strömt und hinter der Prallwand 4 verschwindet.When the blow-out of the air jets on the table top and on both sides, a wall friction weitgehenst can be turned off, so that the air flows over the entire surface of the working space 3 inwards and disappears behind the baffle 4.

Diese Ausbildung hat insbesondere bei dem Arbeiten mit schweren Gasen den Vorteil, daß diese zur Oberfläche der Tischplatte absinken und durch den nach hinten gerichteten Strömungsanteil direkt an der unteren Absaugöffnung 5b des Arbeitsraumes 3 verschwinden.This training has particular in the work with heavy gases have the advantage that they sink to the surface of the table top and disappear through the backward flow component directly to the lower suction opening 5b of the working space 3.

Durch die Einströmung der Zusatzluft als Freistrahl 18 im oberen Bereich des Abzuges am Umlenkteil 17 wird auch der Bereich des Profils des Schiebefensters 9 von Frischluft umströmt, so daß auch an der Oberkante des Schiebefensters 9 keine Luft austreten kann.Due to the inflow of additional air as a free jet 18 in the upper region of the trigger on the deflector 17 and the area of the profile of the sliding window 9 is surrounded by fresh air, so that even at the top of the sliding window 9 no air can escape.

Die Kombination aus dem Freistrahl 18 und den Wand- bzw. Bodenstrahlen 21, 22 erzeugt daher ein ideales Strömungsbild im Abzug.The combination of the free jet 18 and the wall or ground beams 21, 22 therefore produces an ideal flow pattern in the trigger.

Mögliche Bemessungen der beiden seitlichen Luftstrahlen 21 sind derart, daß diese etwa 15 bis 20 m3/h ausmachen. Der untere Luftstrahl 22 hat eine Luftmenge von 10 m3/h pro 1fd. Meter. Die Luftgeschwindigkeit beträgt 2m pro Sekunde. Der Auslenkwinkel der Luftstrahlen 21, 22 liegt vorzugsweise bei etwa 20°, so daß diese unter einem spitzen Winkel zu den Innenflächen im Arbeitsraum 3 ausströmen. Der obere Freistrahl 18 am Umlenkprofil 17 wird nicht an eine Wand angelenkt, sondern in Form eines Freistrahles vor den Raum geblasen. Er benötigt daher eine wesentlich höhere Luftmenge von ca. 100 bis 150 m3/h pro lfd. Meter Abzugsbreite. Ein Abzug mit einer Breite von 1.500 mm kommt daher mit einem Freistrahl von 150 m3/h und mit Wandstrahlen von ca. 50 bis 60 m3/h aus.Possible dimensions of the two lateral air jets 21 are such that they make up about 15 to 20 m 3 / h. The lower air jet 22 has an air volume of 10 m 3 / h per 1fd. Meter. The air speed is 2m per second. The deflection angle of the air jets 21, 22 is preferably about 20 °, so that they flow at an acute angle to the inner surfaces in the working space 3. The upper free jet 18 on the deflection profile 17 is not hinged to a wall, but blown in the form of a free jet in front of the room. He therefore requires a much higher air flow of about 100 to 150 m 3 / h per running meter deduction width. A fume hood with a width of 1,500 mm therefore has a free jet of 150 m 3 / h and wall blasting of about 50 to 60 m 3 / h.

Da ein derartiger Abzug mit einer Luftregelung betrieben werden kann, benötigt er bei geschlossenem Schiebefenster 150 m3/h. Vorzugsweise ist die Ausbildung derart, daß bei geöffnetem Schiebefenster der Abzug 900 m3/h absaugt und alle Wand- und Stützstrahlen erzeugt werden.Since such a trigger can be operated with an air control, it requires 150 m 3 / h with the sliding window closed. Preferably, the training is such that when the sash open the trigger sucks 900 m 3 / h and all wall and support beams are generated.

Beim Schließen des Schiebefensters 9 wird der Freistrahl 18 an dem Umlenkprofil 17 abgeschaltet, so daß der Abzug bei geschlossenem Schiebefenster auf ca. 150 m3/h Luftbedarf abgesenkt werden kann. Es empfiehlt sich daher den Abzug mit einer Regelung zu betreiben, die die Stellung des vertikalen Schiebefensters 9 mißt. Öffnet das vertikale Schiebefenster 9 um mehr als 50 % dann wird der Freistrahl 18 an dem Umlenkprofil 17 eingeschaltet. Das gleiche gilt auch dann, wenn sich das horizontale Schiebefenster des Abzuges um mehr als 10 bis 20 mm öffnet. Ansonsten ist der Freistrahl 18 abgeschaltet.When closing the sliding window 9, the free jet 18 is switched off at the deflection profile 17, so that the trigger can be lowered with the sliding window closed to about 150 m 3 / h air requirement. It is therefore recommended operate the trigger with a control that measures the position of the vertical sliding window 9. Opens the vertical sliding window 9 by more than 50% then the free jet 18 is turned on the deflection profile 17. The same applies even if the horizontal sliding window of the trigger opens more than 10 to 20 mm. Otherwise the free jet 18 is switched off.

Bei einem Abzug im Nachtbetrieb können auch die Wandstrahlen 21, 22 abgeschaltet sein, so daß der Abzug je nach Bedarfssituation immer mit einer geringen Luftmenge gefahren werden kann, was einen deutlichen Vorteil gegenüber einem herkömmlichen Schleierabzug darstellt. Die Abluftmenge beträgt dann 100 m3/h.In a deduction in night mode, the wall jets 21, 22 may be switched off, so that the trigger can be driven depending on the needs always with a small amount of air, which is a clear advantage over a conventional veil trigger. The exhaust air amount is then 100 m 3 / h.

Da die Stützstrahlen einen wesentlichen Einfluß auf die Funktion des Abzuges haben, müssen sie im Zuge der geforderten Überwachung der lufttechnischen Funktion des Abzuges laufend geprüft und überwacht werden. Diese Überwachung kann mit einem Differenzdrucksensor im Überdruckbereich der Einblasung ausgeführt werden. Bei Fehlfunktion erfolgt eine Alarmierung.Since the support beams have a significant influence on the function of the trigger, they must be continuously tested and monitored in the course of the required monitoring of the ventilation function of the trigger. This monitoring can be carried out with a differential pressure sensor in the overpressure area of the injection. In case of malfunction, an alarm is issued.

Das oben beschriebene Ausführungsbeispiel des erfindungsgemäßen Abzuges zeigt eine hohe Stabilität gegenüber einer Seiten- oder Schrägströmung, indem ein Totraumgebiet an den Abzugsflächen oder an den Abzugsschiebern verhindert wird. Es ist weiterhin für eine sehr gute Absaugung von schweren Gasen gesorgt, da diese zur Tischplatte 2 absinken und durch den Zusatzluftstrahl 22 in die Öffnung 5b eingeblasen werden. Wird im Abzug mit leichen Gasen gearbeitet, so sorgt der Freistrahl 18 an dem Umlenkprofil 17 dafür, daß leichte Gase, die sich im Arbeitsraum 3 oben oberhalb dieses Stützstrahles 18 bilden, zuverlässig in dem oberen Bereich des Abzuges festgehalten werden und den unteren Arbeitsbereich nicht kontaminieren können.The above-described embodiment of the trigger according to the invention shows a high stability with respect to a lateral or oblique flow, in that a dead space area on the take-off surfaces or on the trigger slides is prevented. It is also taken care of for a very good extraction of heavy gases, as these fall to the table top 2 and are blown through the additional air jet 22 in the opening 5b. When working in the fume hood with gasses, the free jet 18 on the deflection profile 17 ensures that light gases which form in the working space 3 above above this support jet 18 are reliably held in the upper area of the fume hood and do not contaminate the lower working area can.

Die erfindungsgemäße Ausbildung, bei der zusätzliche Luftstrahlen 21, 22, 18 erzeugt werden, kann mit der Abzugregelung so verknüpft werden, daß der Abzug mit einer möglichst geringen Luftmenge betrieben werden kann.The inventive construction, are generated in the additional air jets 21, 22, 18, with the trigger control be linked so that the trigger can be operated with the least possible amount of air.

Claims (13)

  1. Fume cupboard comprising a housing (1) having a working chamber (3) located therein which is open on one side and confined on the floor side by a table plate (2) and at the sides by side walls (27), and devices (8, 11) arranged at the front edge of the table plate (2) and the side walls (27) which emit air jets (21, 22) into the working chamber (3) in such a way that the air jets (21, 22) flow into the working chamber (3) at an acute angle to the internal surfaces of the table plate (2) and the side walls (27), characterized in that the devices are configured as hollow flow profile parts (8, 11) with a leading surface directed forwards from the working chamber (3) and with openings through which the air jets (21, 22) are emitted into the working chamber (3), and that the interior of the flow profile parts (8, 11) is connected to an air supply and the air jets (21, 22) consisting of compressed air are emitted in the form of floor and wall jets, which sweep along the floor and the side walls, through which the accumulation of harmful substances on the internal surfaces of the table plate (2) and the side walls (27) inside the working chamber (3) is avoided.
  2. Fume cupboard according to claim 1, characterized in that the flow profile parts (8, 11) are provided over the whole length of the front edge of the table plate (2) and the side walls (27), over which the working chamber (3) is open.
  3. Fume cupboard according to claim 1 or 2, characterized in that the openings are configured as nozzles.
  4. Fume cupboard according to claim 1 or 2, characterized in that the openings are configured as slits.
  5. Fume cupboard according to one of the previous claims, characterized in that the acute angle is about 20°.
  6. Fume cupboard according to one of the previous claims, characterized in that on the open side a vertical sliding window (9) is provided and a free jet device (12) is provided, which produces a free jet (18), which is guided over a guide profile (17) into the interior of the working chamber.
  7. Fume cupboard according to claim 6, characterized in that a flow profile (10) is provided at the bottom edge of the sliding window (9).
  8. Fume cupboard according to claim 6 or 7, characterized in that the free jet (18) can be switched on and off depending on the position of the sliding window (9).
  9. Fume cupboard according to one of the previous claims, characterized in that the air jets (21, 22) are produced through a common fan with an amount of air equal to 10 to 15 m3/h.
  10. Fume cupboard according to one of the previous claims, characterized by a baffle wall (4), which extends in front of the back wall of the fume cupboard inside the working chamber and is configured such that the air jets (21, 22), which flow along the side walls (27) and the table plate (2), are taken in directly between the baffle wall (4) and the surrounding side walls (27) and the table plate (2).
  11. Fume cupboard according to claim 6, characterized in that the free jet is made of air from a supply air network or ambient air by means of a fan.
  12. Fume cupboard according to one of the precious claims, characterized by an air regulation, which includes all air jets.
  13. Fume cupboard according to one of the previous claims, characterized by a monitoring device, which monitors the supply of air via the air jets.
EP02754996A 2001-09-18 2002-08-14 Fume cupboard Expired - Lifetime EP1444057B8 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10146000A DE10146000A1 (en) 2001-09-18 2001-09-18 Fume cupboard for chemical laboratory uses additional air directed across its inner surfaces for preventing escape of fumes
DE10146000 2001-09-18
PCT/EP2002/009141 WO2003024631A1 (en) 2001-09-18 2002-08-14 Fume cupboard

Publications (3)

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EP1444057A1 EP1444057A1 (en) 2004-08-11
EP1444057B1 true EP1444057B1 (en) 2011-07-06
EP1444057B8 EP1444057B8 (en) 2011-11-23

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EP02754996A Expired - Lifetime EP1444057B8 (en) 2001-09-18 2002-08-14 Fume cupboard

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US (1) US9266154B2 (en)
EP (1) EP1444057B8 (en)
JP (2) JP4189318B2 (en)
CN (1) CN1287914C (en)
AT (1) ATE515333T1 (en)
AU (1) AU2002321305B2 (en)
CA (1) CA2454280C (en)
DE (1) DE10146000A1 (en)
DK (1) DK1444057T3 (en)
ES (1) ES2364748T3 (en)
HK (1) HK1072394A1 (en)
MX (1) MXPA04002463A (en)
PT (1) PT1444057E (en)
WO (1) WO2003024631A1 (en)

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DE102012105132A1 (en) 2012-06-13 2013-12-19 Waldner Laboreinrichtungen Gmbh & Co. Kg Trigger for high thermal loads
DE102013215667A1 (en) 2013-08-08 2015-02-12 Konrad Kreuzer suction
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WO2018122304A1 (en) 2016-12-29 2018-07-05 Waldner Laboreinrichtungen Gmbh & Co. Kg Laboratory fume hood having guided wall jets
DE102016125890A1 (en) 2016-12-29 2018-07-05 Waldner Laboreinrichtungen Gmbh & Co. Kg Fume hood with wall jets
DE102016125891A1 (en) 2016-12-29 2018-07-05 Waldner Laboreinrichtungen Gmbh & Co. Kg Fume hood with guided wall jets
WO2018122302A1 (en) 2016-12-29 2018-07-05 Waldner Laboreinrichtungen Gmbh & Co. Kg Laboratory fume hood having wall jets
DE102020132826B3 (en) 2020-12-09 2022-05-25 Waldner Laboreinrichtungen Gmbh & Co. Kg Laboratory fume hood with flow noise reduction

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AU2002321305B2 (en) 2007-10-04
ES2364748T3 (en) 2011-09-13
US20040242143A1 (en) 2004-12-02
JP2007212132A (en) 2007-08-23
PT1444057E (en) 2011-09-13
CA2454280A1 (en) 2003-03-27
MXPA04002463A (en) 2005-04-08
DE10146000A1 (en) 2003-01-16
WO2003024631A1 (en) 2003-03-27
CA2454280C (en) 2010-10-19
CN1555296A (en) 2004-12-15
JP2005502856A (en) 2005-01-27
EP1444057A1 (en) 2004-08-11
CN1287914C (en) 2006-12-06
US9266154B2 (en) 2016-02-23
DK1444057T3 (en) 2011-10-24
EP1444057B8 (en) 2011-11-23
ATE515333T1 (en) 2011-07-15
HK1072394A1 (en) 2005-08-26
JP4189318B2 (en) 2008-12-03

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