US3358579A - Fume-chamber ventilating device - Google Patents

Fume-chamber ventilating device Download PDF

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Publication number
US3358579A
US3358579A US532984A US53298466A US3358579A US 3358579 A US3358579 A US 3358579A US 532984 A US532984 A US 532984A US 53298466 A US53298466 A US 53298466A US 3358579 A US3358579 A US 3358579A
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United States
Prior art keywords
chamber
residues
air
fume
casing
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Expired - Lifetime
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US532984A
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English (en)
Inventor
Hauville Francois
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TECLAB
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TECLAB
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Publication of US3358579A publication Critical patent/US3358579A/en
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    • 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
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25H—WORKSHOP EQUIPMENT, e.g. FOR MARKING-OUT WORK; STORAGE MEANS FOR WORKSHOPS
    • B25H1/00—Work benches; Portable stands or supports for positioning portable tools or work to be operated on thereby
    • B25H1/20—Work benches; Portable stands or supports for positioning portable tools or work to be operated on thereby with provision for shielding the work area

Definitions

  • the partition separating the working chamber from the suction chamber comprises a plurality of vents in the form of conduits formed by truncated cones of convergent tubes which accelerate the circulation of air between the two chambers and are located so that such air strikes the internal wall of the suction chamber and the solid residues carried by the air are separated and entrained by the suction so that they strike a sheet of water projected upon the wall of the suction chamber.
  • This invention relates to improvements in ventilating devices for equipping notably the hoods or so called fume-chambers usually provided above working benches, tables and like surfaces in laboratories.
  • Fume-chamber ventilating devices intended for doubleenclosure fume-chambers, i.e. systems comprising an inlet or handling chamber and an exhaust chamber, are already known, the gaseous residues released during the laboratory handling operations being drawn from this exhaust chamber and vented to the outer atmosphere.
  • This two-chamber arrangement of known fume venting devices is obtained by using internal partition means dividing the hood into two chambers communicating with each other through vertically staggered apertures.
  • certain known arrangements comprise means for directing fresh air from the outer atmosphere onto the working surface with a view notably to promote the eduction of residues, notably of gaseous nature, released during these handling operations.
  • the problem consists essentially first in separating from their vehicle (which is normally the air stream introduced into the fume-chamber) all kinds of particles capable of forming in the fume-chamber condensates of agglomerates likely to develop risks of fire and/ or explosion, and second in exhausting the gaseous residues to the outer atmosphere so that they are definitely free of any risk of polluting the atmosphere, and third in enabling the laboratory stall to perform their handling operations under the best possible and safest conditions.
  • these various objects are achieved by providing a communication between the handling chamber and the exhaust chamber by means of duct-like vent passages extending for example horizontally and causing this air on the one hand to flow at a relatively high speed from one chamber to the other, and on the other hand to undergo sudden and sharp changes of direction by causing this air, previously accelerated by said vent passages, to suddenly switch from a horizontal direction to a vertical direction.
  • the particles thus fixed to its surface are trapped, diluted and entrained to exhaust.
  • the duct supplying fresh air from the outer atmosphere comprises means for causing this fresh air to be directed under the working surface of the laboratory table, whereby handling operations can be performed thereon under the best possible conditions while promoting and directing the flow of air streams into the handling chambers with a view to cause them to flow undisturbed into the suction chamber.
  • the fresh-air supply duct comprises one or more orifices providing a communication between this duct and the upper portion of the suction chamber, each one of these orifices being adapted to be closed more or less by a shutter of which the degree of opening is inversely proportional to the opening of the movable register of the hood, whereby the quantity of air introduced into the handling chamber can be varied at will.
  • FIGURE 1 is a perspective view, with parts broken away, showing a fume-chamber equipped with the device of this invention according to a first form of embodiment thereof;
  • FIGURE 2 shows on a slightly larger scale the same device as seen in vertical section and elevation
  • FIGURE 3 is a section showing on a larger scale a duct-shaped vent passage of the device of this invention.
  • FIGURE 4 is a view similar to FIGURE 2 of another form of embodiment of the device according to this invention.
  • the movable register of the hood is surrounded by a casing 16- in which it is adapted to move freely.
  • the hood secured to a'rear Wall 17 having a bracket 13 rigidly fastened or embedded therein is connected through a flexible hose 18 to a suction duct 19 (see FIGURE 4) comprising a suction fan mounted in an exhaust pipe 20.
  • the ventilation device comprises a series of partitions 21, 22, 23 made from a chemically inert material, which constitute on the one hand a so-called handling chamber 24 in which the gas, vapors, smokes, fumes, etc. from the laboratory handling operations performed on the underlying working surface 11 are collected and on the other hand a suction chamber 25, and finally a jacket or lining 26' for apurpo'se to be set forth presently.
  • the innermost partition 21 has. inserted therein, in the vicinity of its upper portion, a perforated tube 33 from which a fine curtain or sheet 34 of water of any other suitable liquid is sprayed onto the inner surface, of partition 23 for trapping the dust particles and thus prevent same from being retained by the walls of the exhaust chamber where the mixing of these particles with the ambient vapors might produce a coating likely, in the long run, to exert a detrimental action on the material, even if inert constituting the walls of the elements concerned;
  • the ejection of water, in the form of a curtain or sheet, towards the rear wall of the exhaust chamber promotes the condensation of thereleased vapors. It is also effective for reducing the aggressiveness of certain acids by diluting same and avoiding the formation of dangerous compounds.
  • the partition 21 Separating the suction chamber 25 from the handling chamber comprises, according to this invention, a plurality of duct-shaped vent passages 21a, as shown more particularly in FIGURE 3.
  • Each vent passage consists in this example of a convergent tube section projecting into the suction chamber 25 and having a length selected as a function of the rate of acceleration which it is desired to impart to the air jets issuing from the handling chamber.
  • vent passages may have any desired and suitable orientation, that is, either uniform throughout the surface area of partition 21 or diiferent according to'their specific position in this area, and their distribution may be regular or not.
  • the tube sections constituting these vent passages have bevelled outlets in order to impart a preferential direction to the air stream issuing therefrom.
  • Their edges are either sharp as shown or slightly rounded as shown at 21.
  • the vent passages according to this invention have a twofold purpose. Their first function consist in accelerating the rate of flow of the air jets materialized by arrows in FIGURE 3, as they pass through the duct passages and thus project by inertia, like a gun tube, onto the surface swept by the water sheet a dripping on the wall 23, the heavier-than-air particles b conveyed by the air stream.
  • vent passages act as a mechanical cooling system. As a consequence of this marked temperature drop is to precipitate, in the form of condensates, the vapors released in the handling chamber as they flow through the vent passages, and
  • the duct-shaped perforations or ducts distributed all over the outer surface of the suction chamber of the fume exhaust system afiord a better distribution of the suctional eifect on the gases and vapors penetrating into the handling chamber.
  • the device is not attended by any ventilation pressure reduction and does not increase the usual sound level, so that it can be mounted directly behind the handling chamber without causing any inconvenience for the operator.
  • the particles and vapors of all kinds released from the handling chamber are from the onset condensed, separated from the air stream, trapped, diluted and subsequently educted, without having to follow any preliminary path likely to enable themto become or constitute a corrosive, detonating or inflammable compound, thus avoiding the presence of foreign substances in the ventilation ducts which, in the long run, are always a cause of reduced efficiency of the ventilation system. Finally, as the ventilation ducts remain in a spotless condition their maintenance is considerably facilitated.
  • the jacket 26 consisting of the space left between partitions 22 and 23 communicates through a passage 38 with a duct 38a receiving fresh air from the external atmosphere by suction.
  • the passage 38 comprises two series of apertures 39, 40 opening the first one into the exhaust chamber and the second one into the space overlying the inclined panel 41 of the fixed hood portion.
  • the above-mentioned first aperture 39 is adapted to be closed by a shutter 42 connected to the movable register 10 of the fume-chamber by controlmeans such that said shutter moves towards the aperture 39 as a function of the upward movement of the movable register of the fume-chamber.
  • jacket means of the ventilation passage 26 comprises an extension beneath the working surface so,
  • the handling chamber 24 and the suction chamber '25 communicate with each other through a series of elonin that the gaseous volumes released above the working surface or table can be evacuated at different and fractional rates; under these conditions, all consequeuts detrimental to the equipment in case of a sudden release of considerable gaseous volumes at the level of the working surface are practically eliminated.
  • properly directed bafile means '30, 31 overlie the orifices 28, 28a.
  • These bafile means are adapted not only to set up a path for the gaseous streams or jets but also to prevent these from following a preferential path towards the walls on which condensation effects might take place.
  • This condensation due to the specific arrangement contemplated herein, take place on the walls of the exhaust chamber.
  • the condensates are collected in troughs 32 overlying the afore-mentioned orifices 28, 28a, in order to prevent their backflow, through these orifices, into the inlet chamber.
  • the nozzles 29 have the same function as the above-mentioned bathe means as far as the upper portion of this chamber is concerned.
  • this invention should not be construed as being limited by the specific form of embodiment described hereinabove and illustrated in the attached drawing.
  • these residues after properly filtering and scrubbing same, may be recycled in the ventilation duct.
  • this duct instead of being connected directly to a device for supplying air under pressure, may be connected to a simple air intake disposed at a proper location.
  • a fume hood particularly for laboratory tables to separate the solid residues and the gaseous residues from the fumes and evacuate them separately comprising a casing, a partition in said casing dividing said easing into a working chamber and an evacuation chamber having an internal wall communicating with one another, evacuation means for the solid residues at the lower portion of said casing, means for ejecting the gaseous residues to the atmosphere at the upper portion of said casing, suction means for establishing a circulation of air between said chambers, a plurality of vents in the form of conduits formed by convergent tubes in said partition projecting into said evacuation chamber and directed towards said internal wall so that air charged with said residues in said working chamber flows at greater speed into said evacuation chamber, said vents strongly projecting the solid residues upon said internal wall, means for projecting a current of descending fluid upon said internal wall to trap and dilute said solid residues and carry them towards said evacuation means While the gaseous residues are ejected to the atmosphere.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Prevention Of Fouling (AREA)
  • Ventilation (AREA)
US532984A 1965-03-12 1966-03-09 Fume-chamber ventilating device Expired - Lifetime US3358579A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8994A FR1438343A (fr) 1965-03-12 1965-03-12 Dispositif de ventilation pour sorbonnes

Publications (1)

Publication Number Publication Date
US3358579A true US3358579A (en) 1967-12-19

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ID=8573757

Family Applications (1)

Application Number Title Priority Date Filing Date
US532984A Expired - Lifetime US3358579A (en) 1965-03-12 1966-03-09 Fume-chamber ventilating device

Country Status (5)

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US (1) US3358579A (en:Method)
BE (1) BE677577A (en:Method)
CH (1) CH448439A (en:Method)
DE (1) DE1673122A1 (en:Method)
FR (1) FR1438343A (en:Method)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3888556A (en) * 1972-12-11 1975-06-10 British Nuclear Fuels Ltd Glove boxes and similar containments
US3894480A (en) * 1974-05-22 1975-07-15 Warf Inst Inc Laboratory bench assembly
US3986835A (en) * 1971-11-27 1976-10-19 Sinloihi Company Limited Ventilation hood for use in the preparation of labelled compounds
DE2917853A1 (de) * 1979-05-03 1980-11-06 Heinrich Hilbers Gasabzugschrank mit belueftungsschleier und ablufteinrichtung
DE3045299A1 (en) * 1979-05-21 1982-02-18 L Lind A method and device for extracting contaminated air by suction
US4860643A (en) * 1988-07-21 1989-08-29 Santa Clara Plastics Ventilated clean room work station with aerodynamic exhaust baffle
DE3939063A1 (de) * 1989-11-25 1991-05-29 Wolfferts Gmbh & Co Kg J Prozessraum, insbesondere abzug fuer den laborbetrieb
US5042456A (en) * 1988-08-19 1991-08-27 Cameron Cote Air canopy ventilation system
US5251608A (en) * 1988-08-19 1993-10-12 Cameron Cote Air canopy ventilation system
DE29500607U1 (de) * 1995-01-16 1995-02-23 LAMED Laborbau GmbH, 01640 Coswig Tischabzug
US6467112B1 (en) * 1999-10-26 2002-10-22 Veterans General Hospital-Taipei Operating table for animal
US20090215376A1 (en) * 2008-02-25 2009-08-27 A1 Envirosciences Limited Laboratory containment system
US20090264060A1 (en) * 2006-04-18 2009-10-22 Oy Halton Group Ltd. Recirculating exhaust system
JP2010216675A (ja) * 2009-03-13 2010-09-30 Tanico Corp 空気処理装置及び空気処理方法
US10041687B1 (en) 2005-05-17 2018-08-07 Mary Ann Caneba Vent extender method having intake air option for conveying ventilation to close proximity of a fume and odor source

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3430224A1 (de) * 1984-08-17 1986-02-27 Bernhard 8702 Eisingen Hauser Arbeitsplatzschutzvorrichtung zum durchfuehren manueller arbeiten
DE4118495A1 (de) * 1991-06-05 1992-12-10 Waldner Laboreinrichtungen Abzug

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2627220A (en) * 1950-11-04 1953-02-03 Sheldon & Co E H Fume hood
US2649727A (en) * 1951-01-04 1953-08-25 Donald L Snow Chemical fume hood
US2704973A (en) * 1950-05-22 1955-03-29 Phillips Petroleum Co Ventilating system
US3011492A (en) * 1958-06-13 1961-12-05 Reuben J Humbert Ventilators for cooking ranges
US3055285A (en) * 1959-11-03 1962-09-25 Gaylord Ind Kitchen ventilating system
DE1154920B (de) * 1960-11-26 1963-09-26 Svenska Flaektfabriken Ab Vorrichtung an Abzuegen, Rauchgasabzuegen und aehnlichen geschlossenen, mit eigenem Lueftungssystem versehenen Raeumen in Laboratorien und aehnlichen Arbeitsraeumen
US3218953A (en) * 1963-02-21 1965-11-23 Hamilton Mfg Co Fume hood construction

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2704973A (en) * 1950-05-22 1955-03-29 Phillips Petroleum Co Ventilating system
US2627220A (en) * 1950-11-04 1953-02-03 Sheldon & Co E H Fume hood
US2649727A (en) * 1951-01-04 1953-08-25 Donald L Snow Chemical fume hood
US3011492A (en) * 1958-06-13 1961-12-05 Reuben J Humbert Ventilators for cooking ranges
US3055285A (en) * 1959-11-03 1962-09-25 Gaylord Ind Kitchen ventilating system
DE1154920B (de) * 1960-11-26 1963-09-26 Svenska Flaektfabriken Ab Vorrichtung an Abzuegen, Rauchgasabzuegen und aehnlichen geschlossenen, mit eigenem Lueftungssystem versehenen Raeumen in Laboratorien und aehnlichen Arbeitsraeumen
US3218953A (en) * 1963-02-21 1965-11-23 Hamilton Mfg Co Fume hood construction

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3986835A (en) * 1971-11-27 1976-10-19 Sinloihi Company Limited Ventilation hood for use in the preparation of labelled compounds
US3888556A (en) * 1972-12-11 1975-06-10 British Nuclear Fuels Ltd Glove boxes and similar containments
US3894480A (en) * 1974-05-22 1975-07-15 Warf Inst Inc Laboratory bench assembly
DE2917853A1 (de) * 1979-05-03 1980-11-06 Heinrich Hilbers Gasabzugschrank mit belueftungsschleier und ablufteinrichtung
DE3045299A1 (en) * 1979-05-21 1982-02-18 L Lind A method and device for extracting contaminated air by suction
US4860643A (en) * 1988-07-21 1989-08-29 Santa Clara Plastics Ventilated clean room work station with aerodynamic exhaust baffle
US5042456A (en) * 1988-08-19 1991-08-27 Cameron Cote Air canopy ventilation system
US5251608A (en) * 1988-08-19 1993-10-12 Cameron Cote Air canopy ventilation system
DE3939063A1 (de) * 1989-11-25 1991-05-29 Wolfferts Gmbh & Co Kg J Prozessraum, insbesondere abzug fuer den laborbetrieb
DE29500607U1 (de) * 1995-01-16 1995-02-23 LAMED Laborbau GmbH, 01640 Coswig Tischabzug
US6467112B1 (en) * 1999-10-26 2002-10-22 Veterans General Hospital-Taipei Operating table for animal
US10041687B1 (en) 2005-05-17 2018-08-07 Mary Ann Caneba Vent extender method having intake air option for conveying ventilation to close proximity of a fume and odor source
US20090264060A1 (en) * 2006-04-18 2009-10-22 Oy Halton Group Ltd. Recirculating exhaust system
US10473336B2 (en) * 2006-04-18 2019-11-12 Oy Halton Group Ltd. Recirculating exhaust system
US10634365B2 (en) 2006-04-18 2020-04-28 Oy Halton Group Ltd. Modular services supply arrangement
US11384941B2 (en) 2006-04-18 2022-07-12 Oy Halton Group Ltd. Exhaust hood
US20090215376A1 (en) * 2008-02-25 2009-08-27 A1 Envirosciences Limited Laboratory containment system
EP2103351A1 (en) * 2008-02-25 2009-09-23 A1 Envirosciences Limited Laboratory containment system
GB2457546B (en) * 2008-02-25 2012-09-19 A1 Envirosciences Ltd Laboratory containment system
US8628388B2 (en) 2008-02-25 2014-01-14 A1 Envirosciences Limited Laboratory containment system
JP2010216675A (ja) * 2009-03-13 2010-09-30 Tanico Corp 空気処理装置及び空気処理方法

Also Published As

Publication number Publication date
BE677577A (en:Method) 1966-08-01
FR1438343A (fr) 1966-05-13
CH448439A (fr) 1967-12-15
DE1673122A1 (de) 1970-08-13

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