EP0106382A1 - Arbeitsplatz mit "Reinraum" durch Laminarluftstrom - Google Patents

Arbeitsplatz mit "Reinraum" durch Laminarluftstrom Download PDF

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Publication number
EP0106382A1
EP0106382A1 EP83201301A EP83201301A EP0106382A1 EP 0106382 A1 EP0106382 A1 EP 0106382A1 EP 83201301 A EP83201301 A EP 83201301A EP 83201301 A EP83201301 A EP 83201301A EP 0106382 A1 EP0106382 A1 EP 0106382A1
Authority
EP
European Patent Office
Prior art keywords
space
filter
working table
flap
duct
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP83201301A
Other languages
English (en)
French (fr)
Other versions
EP0106382B1 (de
Inventor
Rudi Bianchetti
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to AT83201301T priority Critical patent/ATE21165T1/de
Publication of EP0106382A1 publication Critical patent/EP0106382A1/de
Application granted granted Critical
Publication of EP0106382B1 publication Critical patent/EP0106382B1/de
Expired 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
    • 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

Definitions

  • the invention relates to a working table, among others suitable for biological activities, provided with an air circulation system with a first filter for filtering air which from a space upstream of said filter is from above fed to a space downstream of said filter and above the working surface of the working table and with a second filter mounted between the space immediately above said working surface and the suction side of a fan, the pressure side of the fan being connected via a duct with an exhaust and with the said space upstream of said first filter.
  • filters are used with a very high filtering capacity for small particles, it being not unusual to let pass no more than3.10-5 of all particles above 0, ⁇ m.
  • ⁇ m By this high degree of filtering out of these particles not only an almost complete protection against bacteria passing said filter is obtained, but the same holds also for virus, which in practice cannot exist independently but only on a matrix or such like, which may be a bacterium for instance.
  • the invention aims to improve the security of working tables with.a constructively simple means which also can be applied directly to working table that already exist.
  • the invention provides that a duct at the location of its division in a connection to the exhaust and a connection to the space upstream of the first filter is provided with an adjustable flap.
  • the_flap has a pivot which is located at the downstream side of the flap.
  • a location of an air control flap per se is known from the cited Dutch Patent Specification 76.698. With the invention this feature enables an effective possibility to modify the division of the air current without influencing the total flow resistance of the system in a considerable degree.
  • connection to the space upstream of said first filter has a passage obliquely oriented with respect to the portion of the duct which leads toward the division, the pivot of the flap being located near the side of said passage which is directed away from the portion of the duct leading to the division.
  • this feature per se has been shown in the cited Dutch Patent Specification 76.698. Also is this position of the passage per se known in working tables without flap.
  • a further important aspect of the invention is, that in order to increase the safeguarding of the room in which the working table is present, it is desired that the duct and the space upstream of the first filter are hermetically sealed from the space that contains the working table. Because in the duct and the said space upstream of the first filter one has air directly coming from the space above the working surface but having been filtered only once, it is possible that this air contains some infectious germs. Because a slight over pressure has to reign in this space with respect to the space containing the working table a high guarantee is important that this hermetical seal is maintained.
  • the flap has no mechanically movable control members extending outside said hermetically sealable space.
  • the flap is adjusted one time for a determined application of the working table, but of course it is also possible to make the flap controllable, for instance by control means which work through a hermetical wall, such as electrical or magnetical control means.
  • FIG. 1 indicates a work sheet that serves the purpose of working surface and at its edges is provided with vent openings, for instance in the shape of a grid or sieve structure 2, by which the space 3 above the working surface is connected to the space 4 below this working surface.
  • a pre-filter 6 At the lower side of this space 4, which at its right side forms a leakage pan 5 a pre-filter 6 has been mounted the lower side of which is connected to a space 7, which at its lower side is closed.by a so-called absolute filter 8.
  • Such a filter has the capacity to retain particles of 0,3 ⁇ m or larger with a perviousness of 3.10 -5 .
  • the space 9 below the absolute filter 8 is connected to the suction side 9' of a fan 10 with an exit 11 which debouches in a duct 12.
  • This duct has at 13 an enlargement toward the right, which debouches in an obliquely oriented passage opening 14 and at the other side a deviation 15 toward the left, which debouches in a vertical exhaust duct 16 with at the upper side an exhaust 17, which preferably is connected to a non shown exhaust channel which debouches outside the building containing the working table.
  • a flap 18 is pivotable about a pivot 19. With non shown means the flap can be fixed in a certain position. If the flap in figures 1 is swayed toward the left an important part of the air passes through the passage opening 14 and when the flap 18 is swayed toward the right a more important part passes through the exhaust 17.
  • the passage opening 14 debouches into a space 20 (vide fig. 1) which by means of a baffle 21 is separated from the space 3 above the working surface.
  • a baffle 21 At its upper end the baffle 21 is somewhat bent wherewith it debouches with little flow resistance into the space 22 above filter 23. Consequently the air enters the space 3 from above through filter 23 and through the front side 24 of the space 3 from the right above the work sheet 1 and forms therein a constant air down flow, which goes toward the vents 2, wherewith also a continuous air flow through the front side 24 of the space 3 occurs in the direction toward the working table. Both these aire currents prevent that suspended particles in space 3 remain there permanently or go outside.
  • the air sucked in by fan 10 passes through ducts 12 and 16, which latter duct is located in a space 20, which toward the outer side is closed by a shutter 25.
  • This shutter can be mounted air tightly and normally is controlled with respect to its seal by means of soaping.
  • the proportionality between the air current which passes through the filter 23 and the one that is sucked in through the front side 24 can be controlled by adjusting flap 18.
  • the rotational speed of the fan 10 can be adjusted for maintaining certain desired flow velocities. With both these adjustment facilities the possibility exists to adjust the working table to an optimum air flow velocity and air current distribution for a certain use. Then, when small variations occur during use, for instance because filters get a higher flow resistance, by a just choice of the starting condition it can be seen to it that is worked amply inside safe application limits. >
  • the filter which firstly may show a tendency to clog is the pre-filter, in which most of the coarse particles suspended in the air are caught. Naturally this filter will be replaced if this is necessary or desired.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Ventilation (AREA)
  • Accommodation For Nursing Or Treatment Tables (AREA)
  • Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
  • Workshop Equipment, Work Benches, Supports, Or Storage Means (AREA)
EP83201301A 1982-09-10 1983-09-09 Arbeitsplatz mit "Reinraum" durch Laminarluftstrom Expired EP0106382B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83201301T ATE21165T1 (de) 1982-09-10 1983-09-09 Arbeitsplatz mit ''reinraum'' durch laminarluftstrom.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL8203523A NL8203523A (nl) 1982-09-10 1982-09-10 Werkbank met laminaire luchtstroom als beveiliging.
NL8203523 1982-09-10

Publications (2)

Publication Number Publication Date
EP0106382A1 true EP0106382A1 (de) 1984-04-25
EP0106382B1 EP0106382B1 (de) 1986-07-30

Family

ID=19840256

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83201301A Expired EP0106382B1 (de) 1982-09-10 1983-09-09 Arbeitsplatz mit "Reinraum" durch Laminarluftstrom

Country Status (4)

Country Link
EP (1) EP0106382B1 (de)
AT (1) ATE21165T1 (de)
DE (1) DE3364965D1 (de)
NL (1) NL8203523A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2243800A (en) * 1990-05-07 1991-11-13 Hortotec A safety cabinet.

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL76698C (de) *
NL7215945A (de) * 1972-11-24 1974-05-28
DE2723503A1 (de) * 1977-05-25 1979-01-11 Eberle Hans Klimaanlage fuer ein hochisoliertes gebaeude mit einer belueftungseinrichtung

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL76698C (de) *
NL7215945A (de) * 1972-11-24 1974-05-28
DE2723503A1 (de) * 1977-05-25 1979-01-11 Eberle Hans Klimaanlage fuer ein hochisoliertes gebaeude mit einer belueftungseinrichtung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PROSPECTUS "NOUVELLE GAMME" of the firm SOFILTRA, Courbevoie (FR), Nr. R.C. Seine 67B3072,4-70, Bousquet *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2243800A (en) * 1990-05-07 1991-11-13 Hortotec A safety cabinet.

Also Published As

Publication number Publication date
ATE21165T1 (de) 1986-08-15
DE3364965D1 (en) 1986-09-04
NL8203523A (nl) 1984-04-02
EP0106382B1 (de) 1986-07-30

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