EP0687512A2 - Hotte d'aspiration et de sécurité pour un laboratoire - Google Patents

Hotte d'aspiration et de sécurité pour un laboratoire Download PDF

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Publication number
EP0687512A2
EP0687512A2 EP95108478A EP95108478A EP0687512A2 EP 0687512 A2 EP0687512 A2 EP 0687512A2 EP 95108478 A EP95108478 A EP 95108478A EP 95108478 A EP95108478 A EP 95108478A EP 0687512 A2 EP0687512 A2 EP 0687512A2
Authority
EP
European Patent Office
Prior art keywords
air
sliding window
safety workbench
workbench according
safety
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP95108478A
Other languages
German (de)
English (en)
Other versions
EP0687512A3 (fr
Inventor
Konrad Kreuzer
Jürgen Liebsch
Ulrich Gärtner
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
Application filed by Waldner Laboreinrichtungen GmbH and Co filed Critical Waldner Laboreinrichtungen GmbH and Co
Publication of EP0687512A2 publication Critical patent/EP0687512A2/fr
Publication of EP0687512A3 publication Critical patent/EP0687512A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F9/00—Use of air currents for screening, e.g. air curtains
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
    • F24F3/12—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling
    • F24F3/16—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by purification, e.g. by filtering; by sterilisation; by ozonisation
    • F24F3/163—Clean air work stations, i.e. selected areas within a space which filtered air is passed
    • 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 safety workbench according to the preamble of claim 1.
  • the space between the two panes of the double window at the upper end is open to the interior of the work cabin, so that the air stream flowing at the front part of the work cabin, ie in the region of the sliding window , is formed from air that passes through the main filter into the interior of the work cabin and in two partial flows, namely along the inside of the sliding window and through the space between the two panes of the sliding window goes down through it.
  • this should avoid a vacuum and swirl area below the lower edge of the sliding window.
  • Such a safety cabinet is used to handle dangerous substances or products in the work cabin, both product protection and personal protection for the laboratory technicians should be ensured.
  • such safety workbenches can be operated in recirculation mode, but the exhaust air can also be discharged into a ventilation system.
  • known safety cabinets lie in the fact that the amounts of air converted are very high.
  • the internally circulated air volume is 900 m3 per linear meter with an additional air quantity sucked in and released from the room of approximately 300 m3 per linear meter.
  • known safety cabinets can only be operated safely with a maximum sliding window opening of approximately 200 mm, which has been proven by corresponding DIN measurements according to DIN 12 950.
  • an opening height of approximately 200-250 mm is provided.
  • a further closing of the sliding window is not provided, a full opening of the sliding window is likewise not possible since the air is introduced into the double window below the main filter, so that the opening height is already limited to 400 mm due to these design features.
  • the object on which the invention is based is to design the safety workbench according to the preamble of claim 1 in such a way that it is possible to work with the sliding window fully open and completely closed and the safety workbench manages with a smaller amount of exhaust air.
  • the air flow at the front of the work cabin is therefore not, as in the known safety workbench, formed from two partial flows from the air which has entered the interior of the work cabin through the main filter in order to eliminate disturbances in the flow at the lower edge of the window, but becomes air passed under pressure from the pressure chamber through the space between the two panes of the double window, so that an air curtain is formed which extends from the lower edge of the sliding window to the cabin floor and shields the entire opening in between from the outside.
  • This air curtain holds the contaminated air safely even in the case of larger opening heights, since it generates a flow impulse transversely to the escaping air, which is most effective at the lower edge of the sliding window, i.e.
  • the air curtain draws in targeted air from this area at this endangered location, which supports the air curtain. Contaminated air from the interior of the work cabin is also sucked in by the air curtain and discharged downwards.
  • the air curtain has such a high shielding effectiveness that the total volume flow can be reduced compared to the known safety cabinets.
  • the flow rate can be reduced and the ratio of circulated to extracted air can be increased.
  • the safety workbench shown in FIGS. 1 and 2 has a work cabin consisting of side walls 2, a rear wall 3 and a cabin floor or a table top 4, which enclose a work area 1 which is delimited on its front side by a sliding window 11 which can be moved up and down.
  • the air flowing from top to bottom in the form of a laminar flow in the work space 1 is sucked off at suction devices 8 and 5 on the front and rear of the table top 4.
  • the exhaust air goes from this collecting trough 6 into filter boxes 7, which are arranged below the table top 4.
  • filter boxes 7 are arranged at a lateral distance from one another, on which the air is distributed, so that there is space between the filter boxes 7 for the operator to sit.
  • the filter boxes 7 can also be arranged next to one another or with their front surface parallel to the width of the safety workbench.
  • the filter boxes 7 can be designed so that their filters can be changed with bag changing technology.
  • the contaminated air is cleaned by the filters in the filter boxes 7 and transported upwards via air channels 19 (FIG. 2), which are located in the side walls 2 but can also run on the rear of the safety workbench.
  • An air collection or vacuum space 16 is provided on the top, in which the air streams arriving from below are collected.
  • the air in the vacuum chamber 16 is detected by a fan 17 and blown into a pressure chamber 18 located below.
  • the air quantities are divided in this pressure chamber 18.
  • the main air stream is pressed vertically downwards via a main filter 14 and guided into the working space 1 via an air distribution frame 15.
  • the main filter 14 and the air distribution frame 15 generate a laminar air flow that goes vertically from top to bottom in the work space 1.
  • a smaller partial air flow leaves the safety workbench vertically via a nozzle 13 to the outside.
  • This partial air flow can also be cleaned by a filter, but this does not necessarily have to be the case. It either enters the laboratory room or is extracted via a technical ventilation system.
  • a further partial air flow enters a further chamber or air pocket 12, which is airtight on all sides and only opens downwards into the space between the two panes of a sliding window designed as a double pane window 11.
  • this fan 24 can be arranged in the upper part of the air pocket 12, which in this exemplary embodiment is also sealed off from the pressure chamber 18.
  • the double-pane window 11 moves up and down in the air pocket 12 and is provided with sealing elements 21 (see FIGS. 3 and 4) which prevent false air from flowing out next to the double-pane window 11.
  • the further partial air flow passes through the double-pane window 11 to an outlet opening located at the lower end.
  • a deflection grille 22 which directs the flow inward, for example, by approximately 25 ° to the working space 1.
  • the sliding window is vertically infinitely adjustable in height
  • the safety workbench can be operated safely at any window opening height, since an air curtain is built up in the sliding window opening area by the partial air flow passing through the double pane, which extends from the lower edge of the sliding window to the front of the table top 4 and the contaminated air in the work area 1 is also safe at larger opening heights the work cabin holds.
  • the air curtain generates a flow pulse transversely to the escaping air, which has its greatest effectiveness at the lower edge of the window, ie exactly at the point that is usually in safety workbenches and fume cupboards in the critical danger area. At these points, the air curtain specifically draws in air from the environment that supports the air curtain.
  • Contaminated air from the work space 1 is also sucked in by the air curtain and discharged downward.
  • the effect of the air curtain becomes less due to friction and expansion of the flow.
  • the front suction 8 then takes effect, which detects the contaminated air directly.
  • the optimal interplay of air curtain and suction means that personal protection can be guaranteed even with large opening heights.
  • the safety workbench becomes insensitive to cross-currents from the room, which can arise, for example, from a draft with the laboratory door open. Other indoor air flows also remain ineffective for the flow guidance in the safety workbench. Due to the common suction of air over the entire opening height, no eddies are induced outside, so that a person working on the safety workbench is not exposed to drafts.
  • the air curtain has a high effectiveness as a shield for the indoor air in the work area 1 from the laboratory air, so that the total volume flows can be reduced compared to conventional safety cabinets.
  • the laminar flow is preferably 0.28 m / s instead of 0.4, and because of the direct compressed air supply to form the air curtain, the latter reaches an exit speed of approximately 0.65 m / s.
  • the ratio of circulated to extracted air volume can be increased from 3: 1 to 8: 1 with standard safety cabinets.
  • With a width of 1500 mm air volumes of 900 m3 laminar flow, 100 m3 flow in the double disc and approx. 200 m3 exhaust air result. When the sliding window is closed, the exhaust air volume flow can be reduced to approx. 30 m3 without impairing the escape safety.
  • two filter boxes 7 are preferably provided, the filters of which can be changed completely contamination-free using bag changing technology.
  • Various filter combinations can be installed in the safety workbench. When working with suspended matter, suspended matter filters are recommended, when working with solvents or vapors, activated carbon filters are used additionally or exclusively.
  • the filter boxes 7 below the table top 4 the contaminated areas are limited to the short distance between the table top 4 and the filter boxes 7. The air is already cleaned after leaving the filter, so that the air flowing upwards in the channels 19 is already filtered. Since there is a negative pressure in the channels 19 due to the fan 17, this air cannot get into the laboratory room.
  • the air sucked in by the fan 17 is blown into the pressure chamber 18 and fed back to the working chamber 1 via the main filter 14 and the flow straightener 15. It is possible to design the filter 14 as a high-performance particulate filter.
  • the partial air flow, which goes to the exhaust air via the nozzle 13, can also go through a high-performance suspended matter filter, so that the air discharged from the high-performance suspended matter filter leaves the safety workbench as required.
  • the sliding window designed as a double-pane window 11 which is arranged on the front of the working cabin, is shown in detail.
  • the sliding window runs in an air pocket 12, which is supplied with air from the pressure chamber 18.
  • the air pocket 12 is sealed airtight on both sides, forwards, backwards and upwards and has only one opening downwards in which the sliding window runs.
  • the sliding window has sealing elements 21 on both long sides, which consist of soft rubber lips, in particular brushes, and prevent the air from the air pocket 12 from flowing out into areas other than the space between the two panes of the sliding window.
  • the sliding window is designed so that the front part of the double pane is longer than the rear part. This ensures, when the safety cabinet is closed, that splash water and splinter protection is guaranteed. This is achieved in particular in that the table top 4 is pulled up at the front, so that its highest point is higher than the lowest point of the sliding window. This means that the sliding window runs in front of a table top which runs obliquely from the highest point of the table top 4.
  • the deflection elements 22 which direct the air jet inwards.
  • An inward air curtain or free jet emerges at the lower edge of the sliding window, which is stabilized by the intake of room air itself and is additionally stabilized by the deflection.
  • the free jet can be further evened out in that a corresponding distributor 25, for example made of a fabric or a sieve, is provided at the exit of the sliding window.
  • This free jet is sucked in at the bottom, ie at the height of the table top 4, into a special perforated plate which is shown in FIG. 6.
  • the perforation 23 of the perforated plate is preferably specific to the free jet Voted.
  • a stronger suction is preferably provided by means of an increased number of holes or a larger hole diameter.
  • the total width of the perforated plate is approx. 4 - 5 times larger than the exit width of the free steel, which ensures that the entire free jet or air curtain is safely absorbed by the perforated plate.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Devices For Use In Laboratory Experiments (AREA)
EP95108478A 1994-06-01 1995-06-01 Hotte d'aspiration et de sécurité pour un laboratoire Withdrawn EP0687512A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4419268 1994-06-01
DE4419268A DE4419268A1 (de) 1994-06-01 1994-06-01 Sicherheitswerkbank

Publications (2)

Publication Number Publication Date
EP0687512A2 true EP0687512A2 (fr) 1995-12-20
EP0687512A3 EP0687512A3 (fr) 1996-09-18

Family

ID=6519601

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95108478A Withdrawn EP0687512A3 (fr) 1994-06-01 1995-06-01 Hotte d'aspiration et de sécurité pour un laboratoire

Country Status (2)

Country Link
EP (1) EP0687512A3 (fr)
DE (1) DE4419268A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10015666A1 (de) * 1999-12-14 2001-06-28 Georg Emanuel Koppenwallner Verfahren und Einrichtung zum Erfassen, Trennen und Absaugen von fluiden Medien unter Verwendung von Frontalwirbelgeneratoren
EP1895242A1 (fr) * 2006-08-02 2008-03-05 Ewald Burkart Procédé et dispositif destinés à empêcher l'air chargé de sortir des pièces à l'aide d'un rideau d'air
CN113751453A (zh) * 2021-08-25 2021-12-07 苏州特福佳实验室系统工程有限公司 一种实验室用高精度调平的通风柜

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10146000A1 (de) 2001-09-18 2003-01-16 Waldner Laboreinrichtungen Abzug
US7318771B2 (en) * 2005-07-19 2008-01-15 Institute Of Occupational Safety And Health, Council Of Labor Affairs Air-isolator fume hood
CN101274327A (zh) * 2006-12-28 2008-10-01 亚申科技研发中心（上海）有限公司 通风橱和通风橱的操作方法
DE202011100301U1 (de) * 2011-05-05 2011-10-20 Düperthal Sicherheitstechnik Gmbh & Co. Kg Schrank, insbesondere Sicherheitsschrank oder Gefahrstoffschrank
CN116532458A (zh) * 2023-06-21 2023-08-04 广东中智源实验室装备制造有限公司 一种内补风节能通风柜结构

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3811780C2 (fr) 1988-04-08 1993-07-01 Prettl, Rolf, 7400 Tuebingen, De

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1139972A (en) * 1966-01-18 1969-01-15 Baird & Tatlock Ltd Improvements relating to fume extraction apparatus
FR1486419A (fr) * 1966-05-14 1967-06-30 Commissariat Energie Atomique Perfectionnements aux sorbonnes
DE7025282U (de) * 1969-07-08 1971-01-21 Becton Dickinson Co Geraet zum luftreinigung
DE7907360U1 (de) * 1979-03-16 1979-08-16 Thieme, Juergen, 5300 Bonn Laborabzugsvorrichtung
JPH0649279B2 (ja) * 1983-08-24 1994-06-29 株式会社日立製作所 清浄作業台
JP2505034B2 (ja) * 1988-11-25 1996-06-05 株式会社イトーキクレビオ ドラフトチャンバ
JPH074538B2 (ja) * 1988-11-25 1995-01-25 株式会社イトーキクレビオ ドラフトチャンバ
DE9015801U1 (de) * 1990-11-19 1991-02-21 Waldner Laboreinrichtungen GmbH & Co, 7988 Wangen Abzug mit Einströmprofil
DE4036845C2 (de) * 1990-11-19 1995-01-05 Waldner Laboreinrichtungen Abzug mit Einströmprofil
US5295902A (en) * 1992-05-07 1994-03-22 Forma Scientific, Inc. Biological safety cabinet
DE9209044U1 (de) * 1992-07-06 1992-11-05 Waldner Laboreinrichtungen GmbH & Co, 7988 Wangen Sicherheitswerkbank

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3811780C2 (fr) 1988-04-08 1993-07-01 Prettl, Rolf, 7400 Tuebingen, De

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10015666A1 (de) * 1999-12-14 2001-06-28 Georg Emanuel Koppenwallner Verfahren und Einrichtung zum Erfassen, Trennen und Absaugen von fluiden Medien unter Verwendung von Frontalwirbelgeneratoren
EP1895242A1 (fr) * 2006-08-02 2008-03-05 Ewald Burkart Procédé et dispositif destinés à empêcher l'air chargé de sortir des pièces à l'aide d'un rideau d'air
CN113751453A (zh) * 2021-08-25 2021-12-07 苏州特福佳实验室系统工程有限公司 一种实验室用高精度调平的通风柜

Also Published As

Publication number Publication date
DE4419268A1 (de) 1995-12-07
EP0687512A3 (fr) 1996-09-18

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