EP0510637B1 - Verfahren und Vorrichtung für die Belüftung eines Behandlungsraumes - Google Patents

Verfahren und Vorrichtung für die Belüftung eines Behandlungsraumes Download PDF

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Publication number
EP0510637B1
EP0510637B1 EP92106942A EP92106942A EP0510637B1 EP 0510637 B1 EP0510637 B1 EP 0510637B1 EP 92106942 A EP92106942 A EP 92106942A EP 92106942 A EP92106942 A EP 92106942A EP 0510637 B1 EP0510637 B1 EP 0510637B1
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EP
European Patent Office
Prior art keywords
processing space
air
supply air
opening
access opening
Prior art date
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Expired - Lifetime
Application number
EP92106942A
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English (en)
French (fr)
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EP0510637A2 (de
EP0510637A3 (en
Inventor
Seppo Leskinen
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Flaekt Woods Oy
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ABB Flaekt Oy
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Publication of EP0510637A2 publication Critical patent/EP0510637A2/de
Publication of EP0510637A3 publication Critical patent/EP0510637A3/en
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Publication of EP0510637B1 publication Critical patent/EP0510637B1/de
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    • 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
    • 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

  • This invention relates to a method of and an equipment for providing ventilation for a production line or other similar processing space which is separated from the surroundings and into which an access opening positioned above the floor level leads from the surroundings, wherein the processing space is separated from the surroundings by blowing treated supply air into the processing space so that an air curtain preventing the entrance of surrounding air is formed in the area of the open access opening of the processing space.
  • German Offenlegungsschrift 2 030 565 discloses a system for controlling the purity of air in laminar cabinets used widely in clean room techniques.
  • the laminar cabinet comprises two zones, one with a vertical flow of air and the other with a horizontal flow of air.
  • One aims at keeping the flow laminar, so that even a minor temperature difference between the cabinet and the surrounding air destroys the flow field completely.
  • Laminar cabinets thus operate appropriately only when the temperature of the supply air and also that of the cabinet is equal to the temperature of air surrounding the cabinet. If the temperature of the supply air and that of the surrounding air differ from each other, convection flows occur due to the density differences of the air and totally change the flows within and around the cabinet.
  • the flow in the laminar cabinet changes substantially even when the supply air of the cabinet is only 2 to 3 degrees colder than the surroundings.
  • the supply air which is thus heavier than the surrounding air, "drops" to the bottom of the cabinet and flows therefrom over the open front edge and drops further to the floor level, where it causes so-called floor draught.
  • warmer room air flows into the cabinet at the upper edge of the access opening, and mixes with the supply air and deteriorates its purity, being less thoroughly filtered.
  • the direction of flow is the opposite, that is, into the cabinet from below and out of the cabinet at the top.
  • Laminar cabinets are unsuitable for air having a temperature clearly above or below the surrounding air temperature.
  • German Offenlegungsschrift 2 245 265 suggests that the air jet providing the air curtain should be divided between two nozzles, which can be directed. Due to induction, the jets, however, join rapidly, whereafter the two jets are no longer of any use. In place of several expected small induction flow turbulences, one large turbulence is created on both sides of the jet. Due to the temperature differences, the air tends to flow outward from the upper portion of the door and inward from its lower portion, so that the system, in fact, increases the influence of convection flows instead of decreasing it.
  • German Offenlegungsschrift 2 359 218 also relates to air curtain blowing. Also in this arrangement the blow strengthens the convection flows.
  • the air in the jet mixes with the outdoor air and is thus colder than the room air, and so it cannot possibly start rising upward under the influence of a mere recess.
  • the cold air flows along the floor into the entire room space, and the warm room air flows out along the ceiling.
  • the described nozzle blowing technique strengthens the convection flow of the warm air.
  • the floor grate should be heated or a strong blow should be directed upward from its inner edge so as to enable the formation of the desired flow field.
  • European Patent Application 0 139 128 describes a laminar cabinet, which, however, does not comprise two zones but an air curtain in which the air is blown downward or sideward in parallel with the laminar flow.
  • the basic idea is that instead of the air circulating in the cabinet and possibly containing poisonous gases, the surrounding air containing no such gases is used in the air jet. In this way, the escape of the gases is prevented.
  • the purpose of the laminar flow in the cabinet in this case as well as in laminar cabinets in general is to keep the particles of the surrounding air away from the cabinet. Thus no circulation flow is created, and one attempts to avoid its creation.
  • Finnish Patent Specification 80778 describes a flow field created in a free space by an air jet technique.
  • the air is blown at an angle of 90° from nozzles positioned in two rows.
  • One does not attempt to affect the convection flows.
  • the object is an even, downwardly directed "air bed", in which mixing with the surrounding air is insignificant.
  • an air flow blown downward drops if the air in the flow is clearly colder than the air contained in the large room space. If it is clearly warmer, the flow remains on the ceiling level, turns 90° on reaching the wall of the room space and passes further along the ceiling in the direction of the room. If the temperature of the air flow is substantially equal to that of the air contained in the room space, the flow is divided into two branches, turns 90° in the horizontal plane already before reaching the wall of the room space and simultaneously turns 90° in the vertical plane. The end result is that the air flow passes downward at the corners of the air supply means.
  • the air distribution device has no noticeable effect on the thermal flows in the large room space.
  • German Offenlegungsschrifts 2 305 101 and 2 359 218 describe methods of providing air curtains in large access openings, such as door openings on the floor level in large production spaces and other similar room spaces to prevent the escape of warm room air. In these methods the air is blown outward from the room space and the blowing and the circulation flow are parallel with the convection flows.
  • DE-B-1 120 104 discloses the separation of a processing space from the surroundings by means of an air curtain which is formed between a blow duct and a suction duct.
  • the air curtain entrains some of the air in the processing space, thus driving a recirculating flow within the space, but also extracting air from the space and lowering the pressure therein.
  • supply air is sucked rather than blown into the space
  • the object of the present invention is to provide a method which avoids the above-mentioned disadvantages and enables a processing space to be separated efficiently by means of an air curtain even when the temperature difference between the supply air and the surroundings is as great as 10° and even more. This object is achieved by means of a method according to claim 1, and equipment according to claim 5.
  • the method according to the invention enables cooled and heated areas to be separated from a large production space, a room or other such space in accordance with the requirements of the production process.
  • the entire production space need not be cooled or heated to a temperature required for a specific work stage, the demand of cooling or heating energy decreases and the investments required for producing the energy are decisively reduced.
  • air within the cooled or heated area can also be kept extremely clean without filtering the entire air flow required for air-conditioning the production space.
  • air impurities possibly formed in the production space are not able to enter the production line.
  • the product hygiene can thus be decisively improved with low costs.
  • the system also eliminates the health hazards of the workers and the working conditions are considerably improved, which improves the productivity of work considerably.
  • the basic idea of the invention is simple. Processing spaces which are colder or warmer than normal are separated as efficiently as possible from the rest of the production space by means of light-structure walls or curtains, which as such is known in the prior art. It is, however, necessary for the work that at least one of the walls is left open or at least provided with large openings, through which the air colder or warmer than the surroundings would escape as a convection flow from within the cabinet if nothing else would be done.
  • Convection flows and leakages of cold/warm air caused by such flows are prevented by creating a circulation flow in the separated processing space, the direction of which is against the convection flows and the flow rate is greater than that of the convection flows.
  • the flow is obtained by shaping the separated space so that a circulation flow is able to develop efficiently and by blowing the supply air into the space through a narrow continuous nozzle having the same width as the opening or wall or through small nozzles or openings positioned close to each other in one or more rows, so that a circulation flow is achieved.
  • the invention also relates to an equipment according to claim 5 for applying the method described above.
  • FIG. 1 illustrates a known ventilation arrangement.
  • a processing space 1 is surrounded by a cabinet 2 having an access opening 3 on one side. Cooled supply air A is blown through nozzles 4 provided at the ceiling of the cabinet in order to form an air curtain 5 within the area of the opening.
  • a desired flow of the supply air at the opening of the processing space is shown by arrows A'' drawn by broken lines.
  • surrounding warmer room air flows into the cabinet at the upper edge of the opening as convection flows B, and mixes with the supply air, the flow of which is shown by arrows A' drawn by solid lines. This air flows along the bottom of the cabinet and over the open front edge and further down to the floor level.
  • the known arrangements usually comprise a perforated top plate or a filter cell or some other similar planar air distribution device, through which air flows at a low rate so as to obtain a laminar flow.
  • the object is to achieve an even, slow flow over the entire cross-sectional area of the opening.
  • the air flow rate is low, e.g. 0.05 to 0.4 m/s.
  • a supply duct 6 is provided adjacent to a lower edge 2a of the opening 3 of the cabinet.
  • the duct 6 is provided with nozzles 7 directed in parallel with a bottom 2b of the cabinet. Cooled supply air A is blown into the processing space through the nozzles at a high rate.
  • a supply air flow A' passes from below via a back wall 2c of the cabinet up to a ceiling 2d and along it to a front wall 2e and further downward across the opening of the cabinet as a natural flow (cold air flows downward).
  • the initial flow rate of the supply air is so high that the circulation flow described above remains in the cabinet, and no warmer room air enters the cabinet as a convection flow B at the upper edge of the opening, unlike in Figure 1.
  • the height of the cabinet and the opening should not be considerably greater than the width, as otherwise two superimposed circulation flows easily result, of which the upper flow is open so that warm air flows into the cabinet at the upper edge of the opening while cold air flows out in the middle.
  • This can be prevented by means of a duct 8 positioned at the upper edge of the opening and having nozzles 9 through which air is blown downward, as shown in Figure 3. In this way, it is possible to control even relatively high openings.
  • the air blown through the nozzles 9 is circulation air C sucked into a duct 10 provided at the back 2c of the cabinet and returned through the duct 8 into the circulation flow A'.
  • a relatively reliable way of preventing the splitting of the circulation flow A' into two is to position a duct 11 at the top of the cabinet, as shown in Figure 4, and introduce supply air through small nozzles 12 positioned in several rows.
  • a double turbulence A', A'' is thus formed within the cabinet, as shown in Figure 4, in which air flows downward on both sides and upward in the middle.
  • the circulation flow can be ensured by blowing air in parallel with the bottom of the cabinet while taking circulation air C through the duct 10. Neither one of the last-mentioned functions is needed in all cases.
  • This way of ventilation as well as that shown in Figure 5 is especially suitable for use when both side walls of the cabinet or production line are open.
  • the nozzles 6 thereby blow against each other from the opposite sides of the cabinet or the production line, and the duct 10 is positioned in the middle of the cabinet or production line.
  • Figure 5 shows an embodiment in which supply air is blown through the duct 11 provided at the top of the cabinet in two directions through nozzles 12 positioned in several rows.
  • This arrangement is particularly suitable for use in large processing spaces, since the jets remain strong on the surface of the cabinet for a long time due to the so-called Coanda phenomenon.
  • Figure 3A is an enlarged view of an alternative structure for the air supply arrangement shown in Figure 2.
  • Figure 3A the same reference numerals as in Figure 2 are used.
  • Figure 3B is an enlarged view of an alternative structure for the additional air circulation arrangement shown in Figure 2.
  • Figure 3B the same reference numerals as in Figure 2 are used.
  • guide plates 2g to 2m for guiding the flow may be provided in the processing space 1.
  • the guide plates 2g to 2m can be positioned close to the walls of the processing space. They may also be formed by portions of the walls or the ducts.
  • the cabinet of the processing space may comprise plates or other means accelerating or directing the circulation flow of supply air and directing or preventing the convection flow of surrounding air at points where the convection flow tends to enter the circulation flow. It is also possible to provide nozzle blows at various points of the cabinet; in Figure 3, for instance, the duct 8 can thus be positioned at the top of the cabinet, so that the nozzles 9 blow along the front wall 2e. In the embodiment of Figure 2, a further duct having nozzles blowing upward along the wall 2c can be provided in the lower portion of the back wall 2c.
  • the duct 8 shown in Figure 3 can be added, or a duct having nozzles blowing upward can be provided centrally below the duct 11, etc.
  • a stationary processing space such as a laboratory cabinet
  • the opening(s) to be closed by an air curtain may be the access opening(s) of a moving conveyor.
  • the supply air can be kept colder, warmer, cleaner or in a condition otherwise deviating from the surrounding air, and blown as a circulation flow according to the invention.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Ventilation (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
  • Cooling Or The Like Of Electrical Apparatus (AREA)
  • Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Devices For Use In Laboratory Experiments (AREA)
  • Air-Flow Control Members (AREA)

Claims (11)

  1. Verfahren zum Bereitstellen von Luftzufuhr für eine Produktionslinie oder ähnlichen Bearbeitungsraum (1) der von der Umgebung getrennt ist und in den eine Zugriffsöffnung (3), die über der Bodenebene angeordnet ist, von der Umgebung führt, wobei der Bearbeitungsraum von der Umgebung durch Einblasen behandelter Versorgungsluft (A) in den Bearbeitungsraum getrennt ist, so daß ein Luftvorhang (5), der den Eintritt von Umgebungsluft verhindert, in dem Gebiet der offnen Zugriffsöffnung des Bearbeitungsraumes gebildet wird, dadurch gekennzeichnet, daß die Versorgungsluft (A) in den Bearbeitungsraum (1) geblasen wird, so daß sie entlang einer geschlossenen Wand des Bearbeitungsraumes strömt, und so daß eine freie Zirkulationsströmung (A') in dem Bearbeitungsraum erzeugt wird, die die Versorgungsluft aufweist; wobei die Richtung der freien Zirkulationsströmung (A') an der Zugriffsöffnung (3) im wesentlichen von einem Oberabschnitt zu einem Unterabschnitt der Zugriffsöffnung (3) ist und im wesentlichen entgegengesetzt zu der Richtung der Konvektionsströmungen (B) der Umgebungsluft ist, die durch eine Temperaturdifferenz zwischen der eingeführten Versorgungsluft und der Umgebungsluft erzeugt wird, und wobei die Strömungsgeschwindigkeit der Zirkulationsströmung (A') größer ist als die Strömungsgeschwindigkeit der Konvektionsströmung an der Zugriffsöffnung.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Versorgungsluft (A) in den Bearbeitungsraum (1) an einer Vorderkante (2a) seiner Zugriffsöffnung (3) parallel zu dem Boden (2b) des Bearbeitungsraumes eingeblasen wird und dann entlang der Rückseite (2c) des Bearbeitungsraumes zu dessen Oberabschnitt (2d) und weiter abwärts von einer oberen Kante (2f) der Zugriffsöffnung dem Boden des Bearbeitungsraumes entgegen verläuft.
  3. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Versorgungsluft in dem Bearbeitungsraum in dem Gebiet der Zirkulationsströmung und im wesentlichen in einer Richtung parallel zu der Zirkulationsströmung eingeblasen wird.
  4. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß zusätzliche Versorgungsluft (C) in den Bearbeitungsraum (1) an dessen Oberabschnitt eingeblasen wird, so daß sie abwärts von der oberen Kante (2f) der Zugriffsöffnung (3) dem Boden (2b) des Bearbeitungsraumes entgegen und weiter zu dem Oberabschnitt des Bearbeitungsraumes läuft.
  5. Vorrichtung zum Bereitstellen von Luftzufuhr für eine Produktionslinie oder anderen ähnlichen Bearbeitungsraum (1), der von der Umgebung getrennt ist und in den eine Zugriffsönffnung (3), die über der Bodenebene angeordnet ist, von der Umgebung führt, wobei die Vorrichtung Einrichtungen (6,7; 11, 12) zum Einblasen behandelter Versorgungsluft (A) in den Bearbeitungsraum aufweist, so daß die Versorgungsluft einen Luftvorhang (5) bildet, der das Eintreten von Umgebungsluft an der Zugriffsöffnung (3) des Bearbeitungsraumes verhindert dadurch gekennzeichnet, daß die Einrichtungen (6, 7; 11, 12) zum Einführen der Versorgungsluft (A) in den Bearbeitungsraum (1) derart angeordnet sind, daß die Versorgungsluft in den Bearbeitungsraum eingeblasen wird, so daß sie entlang einer geschlossenen Wand dieses strömt und dann in den Bearbeitungsraum als eine frei zirkulierende Strömung (A'; A', A''), die an der Zugriffsöffnung (3) eine Richtung im wesentlichen von einem Oberabschnitt zu einem Unterabschnitt der Zugriffsöffnung (3) aufweist, und im wesentlichen entgegen der Richtung der Konvektionsströmungen (B) der Umgebungsluft strömt, die durch Temperaturdifferenzen zwischen der Versorgungsluft und der Umgebungsluft verursacht werden, und die eine Strömungsgeschwindigkeit aufweist, die größer ist als die Strömungsgeschwindigkeit der Konvektionsströmungen der Umgebungsluft an einer niedrigeren Kante der Zugriffsöffnung.
  6. Vorrichtung nach Anspruch 5, bei der der Bearbeitungsraum (1) durch einen Schrank, der eine Zugriffsöffnung (3) an einer Seite aufweist, gebildet wird, dadurch gekennzeichnet, daß die Einrichtungen (6, 7) zum Einführen der Versorgungsluft (A) an der unteren Kante (2a) der Öffnung (3) montiert sind, und daß die Einrichtungen die Versorgungsluft in eine Richtung parallel zu dem Boden (2b) des Schrankes der Rückseite (2c) des Schrankes entgegen einblasen, so daß die Versorgungsluft entlang der Rückseite und der Decke (2d) läuft und dann einen Luftvorhang (5) an der Öffnung formt.
  7. Vorrichtung nach Anspruch 6, dadurch gekennzeichnet, daß Einrichtungen (8, 9) an der oberen Kante (2f) der Öffnung (3) des Schrankes (2) zum Einblasen zusätzlicher Luft (C) in eine Richtung parallel zu der Öffnung entgegen der unteren Kante (2a) montiert sind.
  8. Vorrichtung nach Anspruch 7 dadurch gekennzeichnet, daß die Einrichtungen (8, 9) zum Einblasen zusätzlicher Luft (C) mit dem Bearbeitungsraum (1) zum Ansaugen zusätzlicher Luft von der Zirkulationsströmung (A') der Versorgungsluft (A) verbunden sind.
  9. Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, daß die Einrichtungen (11, 12) zum Einführen von Versorgungsluft (A) an dem oberen Ende des Bearbeitungsraumes zum Einblasen der Versorgungsluft entgegen und entlang der Decke (2d) des Bearbeitungsraumes derart montiert sind, daß die Versorgungsluft in zwei divergierenden Zirkulaitonströmungen (A', A'') strömt, wobei eine (A') abwärts parallel zu der Öffnung (3) strömt und die andere (A'') abwärts entlang der Rückseite (2c) des Bearbeitungsraumes strömt, und beide (A', A'') in der Mitte des Bearbeitungsraumes aufwärts strömen.
  10. Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, daß die Einrichtungen (11, 12) zum Einführen von Versorungsluft (A) an dem oberen Ende des Bearbeitungsraumes (1) jeweils zum Einblasen von Versorgungsluft in entgegengesetzter Richtung, gegen die Öffnung (3) und gegen die Rückseite (2c) des Bearbeitungsraumes montiert sind, so daß die Versorgungsluft in zwei Zirkulationsströmungen (A', A'') strömt, wobei eine (A') abwärts parallel zu der Öffnung (3) und die andere (A'') abwärts entlang der Rückseite (2d) des Bearbeitungsraumes und beide (A', A'') in der Mitte des Bearbeitungsraumes aufwärts.
  11. Vorrichtung nach Anspruch 9 oder 10, dadurch gekennzeichnet, daß Führungsplatten (2g bis 2m) in oder nahe bei den Wänden des Bearbeitungsraumes (1) zum Führen der Luftströmung und zum Fördern der Zirkulationsströmung (A', A'') vorgesehen sind.
EP92106942A 1991-04-23 1992-04-23 Verfahren und Vorrichtung für die Belüftung eines Behandlungsraumes Expired - Lifetime EP0510637B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI911968 1991-04-23
FI911968A FI88541C (fi) 1991-04-23 1991-04-23 Foerfarande och anordning foer att aostadkomma en luftvaexling foer ett behandlingsrum

Publications (3)

Publication Number Publication Date
EP0510637A2 EP0510637A2 (de) 1992-10-28
EP0510637A3 EP0510637A3 (en) 1993-06-30
EP0510637B1 true EP0510637B1 (de) 1995-12-27

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EP (1) EP0510637B1 (de)
AT (1) ATE132244T1 (de)
DE (1) DE69207056T2 (de)
DK (1) DK0510637T3 (de)
FI (1) FI88541C (de)
NO (1) NO175226C (de)

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CN103608626A (zh) * 2011-04-06 2014-02-26 阿桑勒公司 温控分层气流装置

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FI96239C (fi) * 1992-02-18 1996-05-27 Suomen Puhallintehdas Oy Menetelmä ja laitteisto kiertoilmavirtauksen aikaansaamiseksi käsittelytilaan
FR2733036B1 (fr) * 1995-04-14 1997-07-04 Unir Dispositif de protection anti-contamination rapprochee
FR2750199B1 (fr) * 1996-06-21 1998-09-11 Cemagref Centre National Du Ma Procede et dispositif de protection rapprochee d'un plan de travail au moyen d'un flux d'air propre
DE19712975A1 (de) * 1997-03-27 1998-10-01 Gwe Ges Fuer Wasseraufbereitun Verfahren zur Optimierung der Luftführung in einer Reinluft-Kabine
DE10145921A1 (de) 2001-09-18 2003-04-03 Volkswagen Ag Vorrichtung zum Bearbeiten eines Werkstücks
JP6735498B2 (ja) * 2016-03-09 2020-08-05 パナソニックＩｐマネジメント株式会社 空調システム
DE102016125891A1 (de) * 2016-12-29 2018-07-05 Waldner Laboreinrichtungen Gmbh & Co. Kg Laborabzug mit geführten Wandstrahlen
DE102016125890A1 (de) * 2016-12-29 2018-07-05 Waldner Laboreinrichtungen Gmbh & Co. Kg Laborabzug mit Wandstrahlen

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US3251177A (en) * 1963-05-15 1966-05-17 Arthur K Baker Dust-free bench
DE2305101A1 (de) * 1973-02-02 1974-08-08 Buettner Schilde Haas Ag Abschirmung eines raumes durch einen luftschleier
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FR2652520B1 (fr) * 1989-10-02 1992-02-07 Sgn Soc Gen Tech Nouvelle Procede et dispositif pour maintenir une atmosphere propre a temperature regulee sur un poste de travail.

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103608626A (zh) * 2011-04-06 2014-02-26 阿桑勒公司 温控分层气流装置

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NO175226C (no) 1994-09-14
NO921557L (no) 1992-10-26
NO175226B (de) 1994-06-06
FI88541C (fi) 1993-05-25
EP0510637A2 (de) 1992-10-28
NO921557D0 (no) 1992-04-22
EP0510637A3 (en) 1993-06-30
FI911968A0 (fi) 1991-04-23
ATE132244T1 (de) 1996-01-15
DE69207056D1 (de) 1996-02-08
FI88541B (fi) 1993-02-15
DE69207056T2 (de) 1996-06-05
FI911968A (fi) 1992-10-24
DK0510637T3 (da) 1996-01-29

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