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
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F24—HEATING; RANGES; VENTILATING
  • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
  • F24F7/00—Ventilation
  • F24F7/04—Ventilation with ducting systems, e.g. by double walls; with natural circulation
  • F24F7/06—Ventilation with ducting systems, e.g. by double walls; with natural circulation with forced air circulation, e.g. by fan positioning of a ventilator in or against a conduit
  • F24F7/10—Ventilation with ducting systems, e.g. by double walls; with natural circulation with forced air circulation, e.g. by fan positioning of a ventilator in or against a conduit with air supply, or exhaust, through perforated wall, floor or ceiling
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
  • B01L1/00—Enclosures; Chambers
  • B01L1/04—Dust-free rooms or enclosures
• • 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
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F24—HEATING; RANGES; VENTILATING
  • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
  • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
  • F24F13/02—Ducting arrangements
  • F24F13/06—Outlets for directing or distributing air into rooms or spaces, e.g. ceiling air diffuser
  • F24F13/068—Outlets for directing or distributing air into rooms or spaces, e.g. ceiling air diffuser formed as perforated walls, ceilings or floors
• • 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
  • F24F3/167—Clean rooms, i.e. enclosed spaces in which a uniform flow of filtered air is distributed
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
  • B01L2200/00—Solutions for specific problems relating to chemical or physical laboratory apparatus
  • B01L2200/08—Ergonomic or safety aspects of handling devices
  • B01L2200/082—Handling hazardous material

Definitions

• the present invention relates to a fame room with a perforated wall according to the introductory portion of the independent claim.
• a fume room is an arrangement similar to a fume hood or a fume cabinet, but so large that an operator may work inside the fume room.
• Fume rooms are used when handling dangerous, infectious or irritable substances that emit gases or particles that have to be removed from the operator. Inside the fume room air continuously moves towards an exhaust in order to remove gases or particles.
• the removal process is efficient for elements with the same density as air, but less efficient for elements with a higher or lower density than air, as these rise or fall on their way towards the exhaust.
• particles may have time to fall down on the floor or on a work surface and get stuck there, such that they are not being sucked out.
• An object of the invention is therefore to provide a fume room with a perforated wall which is able to suck out contaminations that are heavier or lighter than air with an improved efficiency.
• the invention relates to a fume room 1 with at least one wall 8 with perforations 5, 5a-b for air suction out of the fame room.
• the perforated wall is divided into at least two sections by at least one section delimiter 7, 11-13, typically a work table or a shelf.
• the perforations do, over a main portion of the perforated wall 8, cover a first percentage per unit of area of the wall surface, and the percentage is typically homogeneously distributed over this main portion of the wall surface.
• the perforation on at least a first of the sections, at least at the upper part of the segment covers a second percentage per unit of area of the wall surface, where the second percentage is larger than the first percentage, and/or the perforation on at least a second of the sections, at least in the lower part of the segment covers a third percentage per unit of area of the wall surface, where the third portion is larger than the first percentage.
• the fume room according to the invention is advantageously able to particularly effectively remove powder particles or volatile vapours with a higher density than air, that are emitted on or above the upper surfaces of the section delimiters.
• the fume room according to the invention is advantageously able to particularly effectively remove volatile vapours with a lower density than air, that are emitted on or above the upper surfaces of the section delimiters.
• the perforations in at least one of the sections both covers a second percentage per unit of area of the wall surface in the upper part of the section and further covers a third percentage per unit of area of the wall surface in the lower part of the section, where the second and third percentages are larger than the first percentage.
• the perforations in all of the sections covers a second percentage per unit of area of the wall surface in the upper part of the sections or covers a third percentage per unit of area of the wall surface in the lower part of the sections, where the second and third percentages are larger than the first percentage.
• Fig. 1 shows a fume room according to prior art in cross section seen from the side
• Fig. 2 shows a fume room according to the invention in cross section seen from the side
• Fig. 3 shows an inner wall according to a first embodiment of the invention seen from the front
• Fig. 4 shows an inner wall according to a second embodiment of the invention seen from the front
• Fig. 5 shows an inner wall according to a third embodiment of the invention seen from the front
• a fume room 1 is an arrangement similar to a fume hood or a fume cabinet, but so large that an operator may work inside the fume room. Fume rooms are used when handling dangerous, infectious or irritable substances that emit gases or particles that have to be removed from the operator. The operator normally sits or stands inside the fume room and works with the dangerous substance on a work table 7.
• Fig. 1 shows a fume room according to prior art in cross section seen from the side.
• the fume room is constituted by a rectilinear volume delineated by four outer walls, a floor 13 and a ceiling 12, and it further comprises an inner wall 8.
• the fume room is divided into two sections by the inner wall 8, where the larger section constitutes an operator space 2 and the smaller section is a fan and filter space 3.
• a fan and a filter is often arranged inside the fan and filter space 3, where the fan draws air through perforations 5 in the inner wall, through a filter and the purified air is then emitted through a rear wall 9 that is provided with perforations too.
• the perforations 5 in the inner wall are evenly sized and evenly distributed across the inner wall, giving an even distribution of suction area per wall area.
• Air is drawn through a perforated front outer wall 10 into the operator space and the air then moves through the operator space towards the inner wall, such that a steady exchange of air and continuous air movement takes place in the space.
• the purpose of this is that potentially contaminated air rapidly is replaced and sucked away from the operator.
• a set of shelves 11 for storage are arranged on the inner wall 8 of the fume room.
• the substance in the form of vapour or particles will be emitted from containers filled with the substance.
• Substances in powder form tend to emit particles that are heavier than air and these are driven by the air current through the fume room towards the inner wall, but they may due to their own weight fall down onto the work table 7 or onto the shelves 11. Once on the work table the particles get stuck and the air current may be insufficient to dislodge them.
• the vapour quickly spread out into the surroundings, faster than the movement of the air current. If the vapours are lighter than air, they preferentially tend to rise upwards.
• Fig. 2 shows a fume room according to the invention in cross section seen from the side. It is embodied as a fume room according to known art, except that the perforations 5, 5a-b through the inner wall 8 are unevenly sized, giving an uneven suction area per wall area.
• the perforations 5 through the inner wall 8, some distance from the ceiling, floor, the work table and the shelves of the fume room, are evenly sized with a first size and evenly distributed to generate an even distribution of suction area per wall area.
• the perforations 5b through the inner wall 8 immediately below the ceiling, the underside of the work table 7 and the underside of the shelves 11 of the fume room have a second size, larger than the first size.
• the perforations 5a through the inner wall 8 immediately above the floor, the upper side of the work table 7 and the upper side of the shelves 11 of the fume room have a third size, larger than the first size.
• the second and third sizes are equal, but generally this does not have to be the case.
• Fig. 3 shows an inner wall according to a first embodiment of the invention as seen from the front side.
• the inner wall is divided into a number of sections delimited by the fiime room ceiling 13, floor 12, the work table 7 and the shelves 1 1, which constitute segment delimiters 7, 11-13.
• the perforations are evenly sized with a first size and evenly spaced such that they generate a first homogenous suction area per wall area.
• the perforations are evenly sized with a second size and evenly spaced such that they generate a homogenous suction area per wall area, which is larger than the first.
• the first embodiment is particularly adapted for work with substances in powder form and efficiently sucks away powder particles that are emitted from or immediately above the upper surfaces of the section delimiters, thus where an operator would typically handle the substances.
• the first embodiment is also particularly adapted for work with substances that emit volatile vapours with a density higher than air, and efficiently sucks away such heavy, volatile vapours that are emitted on or above the upper surfaces of the section delimiters.
• Fig. 4 shows an inner wall according to a second embodiment of the invention as seen from the front side.
• the perforations are evenly sized with a first size and evenly spaced such that they generate a first homogenous suction area per wall area.
• the perforations are evenly sized with a third size and evenly spaced such that they generate a third homogenous suction area per wall area, which is larger than the first.
• the second embodiment is particularly adapted for work with substances that emit volatile vapours with a density lower than air, and efficiently suck away such lightweight, volatile vapours that are emitted on or above the upper surfaces of the section delimiters.
• Fig. 5 shows an inner wall according to a third embodiment of the invention as seen from the front side.
• the perforations are evenly sized with a first size and evenly spaced such that they generate a first homogenous suction area per wall area.
• the perforations are evenly sized with a second size and evenly spaced such that they generate a second homogenous suction area per wall area, which is larger than the first.
• the third embodiment is adapted for work both with substances that emit volatile vapours with a density lower than air and for work with substances in powder form. In the third embodiment, both lightweight, volatile vapours and powder particles are efficiently sucked away.
• the perforations of the first sizes are all equally sized, identically shaped and evenly spaced. Obviously, they do not have to be precisely equally sized, identically shaped and evenly spaced, but the average suction area per wall area over these regions has to have an essentially homogenous first level. Potentially, they may therefore be of significantly different sizes, if they also are correspondingly densely distributed, such that the average suction area per wall area over these surfaces still is at an essentially homogenous first level
• the perforations of the second and third sizes are all equally sized, identically shaped and evenly spaced. These too may be allowed to be of different sizes, differently shaped and unevenly spaced, as long as the suction area per wall area over these regions sits at another level than the first, and this second level is higher than the first. This second level does not necessarily be homogenous, but this may be advantageous.
• the perforations are described as being situated immediately by the section delimiters in a single row, but obviously they may be distributed over several rows or be randomly distributed or distributed in some other fashion and they do not have to reach the section delimiters.
• the fume room is split into two parts by an inner wall with perforations.
• the fume room may obviously be differently designed, so the perforations do not necessarily have to be distributed over such an inner wall, even though this is a common and suitable solution.

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• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Health & Medical Sciences (AREA)
• Clinical Laboratory Science (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Ventilation (AREA)
• Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
• Filtering Of Dispersed Particles In Gases (AREA)

Applications Claiming Priority (2)

Publications (2)

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Family Applications (1)

Country Status (4)

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• 2014
  • 2014-10-23 SE SE1400509A patent/SE539939C2/sv unknown
• 2015
  • 2015-10-23 JP JP2017519609A patent/JP2017534829A/ja active Pending
  • 2015-10-23 WO PCT/SE2015/000061 patent/WO2016064321A1/en not_active Ceased
  • 2015-10-23 EP EP15852323.3A patent/EP3209946A4/de not_active Withdrawn

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