EP0807228B1 - Verfahren und vorrichtung zum einschliessen eines gases, insbesondere in einem raum für die behandlung kontinuierlich durchlaufender produkte - Google Patents

Verfahren und vorrichtung zum einschliessen eines gases, insbesondere in einem raum für die behandlung kontinuierlich durchlaufender produkte Download PDF

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Publication number
EP0807228B1
EP0807228B1 EP96902323A EP96902323A EP0807228B1 EP 0807228 B1 EP0807228 B1 EP 0807228B1 EP 96902323 A EP96902323 A EP 96902323A EP 96902323 A EP96902323 A EP 96902323A EP 0807228 B1 EP0807228 B1 EP 0807228B1
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EP
European Patent Office
Prior art keywords
jet
atmosphere
gas
space
confined
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.)
Expired - Lifetime
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EP96902323A
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English (en)
French (fr)
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EP0807228A1 (de
Inventor
Laurent Sohier
François Meline
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Societe Generale pour les Techniques Nouvelles SA SGN
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Societe Generale pour les Techniques Nouvelles SA SGN
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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
    • 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
    • F24F9/00—Use of air currents for screening, e.g. air curtains
    • F24F2009/007—Use of air currents for screening, e.g. air curtains using more than one jet or band in the air curtain

Definitions

  • the subject of the present invention is a method and a device for confinement of an atmosphere in a space communicating with the outside through at least one opening; a gas curtain being generated at said level opening.
  • Such gas curtains have a slow jet, the sting of which ensures the dynamic separation of atmospheres and a fast jet which stabilizes and stiffens said slow jet.
  • suction mouth In contrast to the jet emission nozzles, there is generally a suction mouth which collects the blown gas as well as a fraction of the separate atmospheres which mix with said gas blown into the induction zone.
  • the gases collected by such a suction mouth are generally treated before recycling or release to the environment.
  • the materials and energy lost by the suction flow are considered necessary and / or negligible vis-à-vis of the desired result.
  • the recovery of the double jet by a suction mouth is not however not systematic ...
  • the fast jet and slow jet emission nozzles are supplied with unpolluted gas.
  • the double jet gas curtain is an air curtain.
  • the air injected in the form of slow and fast jets is recirculated or rejected after filtration of suspended particles entrained in the suction mouth.
  • the invention therefore relates to a method for maintain a special atmosphere in a space communicating with the exterior thanks to at least one opening protected by a double gas curtain jet.
  • Said atmosphere is special in that it differs from the atmosphere ambient by at least one element of differentiation which, for example, can consist of a particle concentration, a gas concentration, a temperature ...
  • Said particular atmosphere or differentiated atmosphere is therefore confined in said space.
  • said particular atmosphere is a clean atmosphere or a polluted atmosphere, compared to the atmosphere ambient.
  • the slow jet of the gas curtain is arranged on the side of said atmosphere confined to avoid turbulent transfers due to passing through.
  • the axial plane of the slow jet emission nozzle and that of the jet emission nozzle fast are parallel. Said nozzles can be arranged on any one sides of the opening.
  • a gas curtain to double jet there is therefore a gas curtain to double jet, the slow jet of said curtain being located on the side of the particular atmosphere confined (point a) above) and, opposite the jet injection area, a device, including a suction mouth for the recovery of gas blown under shape of said jets and of a fraction of said confined atmosphere (point b) above). It is also generally used at said mouth of suction, a fraction of the ambient atmosphere. Said jets and mouth are arranged so as to maintain in the confined atmosphere characteristics constant or between precise values. Their particular provision allows, as will be explained below, to minimize material and / or energy losses by the recovery rate and by consequent to minimize the continuous contributions necessary for the maintenance of said special characteristics of the confined atmosphere.
  • a fraction of the slow jet flow is sent into said atmosphere confined (point d) above). Said fraction is taken from the induction zone slow jet, confined space side of course. It is not directly taken back through the suction mouth. It penetrates into said confined atmosphere, generates there turbulence and is at least partly taken up by the slow jet for its induction.
  • the slow jet induction flow is typically according to the invention taken partly from itself (confined space side). Space side confined, said slow jet self-stabilizes. In fact, part of it is "recycled", in the confined space for this purpose. As for the ambient atmosphere, we recall here that said slow jet is stabilized by the rapid jet.
  • the containment process with double jet gas curtain is indeed implemented according to the invention under conditions such that an effect is observed regulating the extracted confined atmosphere flow, with maintenance of homogeneous conditions in said confined atmosphere.
  • This regularization effect is particularly interesting when the gas curtain delimits a treatment in which a specific reagent must be kept in concentration sufficient in the atmosphere for the duration of the treatment.
  • the curvature curtain caused by overpressure mainly due to injection into the confined space of a fraction of the slow jet flow
  • the turbulence generated inside the treatment chamber (by the injection of a fraction of the slow jet flow within it) homogenizes the distribution of said reagent in the atmosphere of the chamber, reagent advantageously added continuously in said chamber to compensate for losses.
  • the gas curtain is not frozen, stabilized in a fixed position.
  • pressure variation which may be due to a variation in the supply flow to an adequate atmosphere and / or when a large object arrives in the confined space
  • the jets move and a more or less significant fraction of the slow jet flow is sent in the confined atmosphere.
  • the technology of the double gas curtain has been adapted. jet so as to minimize the loss of materials and / or energy from the confined atmosphere, through the suction mouth, while homogenizing the characteristics of said confined atmosphere.
  • the curtain of gas will in this context be generated from the same atmosphere with at least one slow jet thermostatically controlled which will maintain the temperature in the confined space.
  • the process of the invention makes it possible, in this context, to make circulate objects continuously, limiting energy losses and gradients of temperature at the inputs and outputs of said tunnels.
  • Such a processing space includes a gas curtain at the entrance and a gas curtain at the exit; gas curtains generally planes successively crossed by the objects or products to be treated, transported by the conveyor system. If the spaces upstream and downstream of the space of treatment are at the same pressure, the two gas curtains work so symmetrical and the same effect of regulating the suction flow is obtained of confined atmosphere on said two curtains.
  • the expected result is obtained with a plane of the gas curtain, inclined, with respect to the plane of the opening, towards the inside of confined space.
  • Said plane of the gas curtain makes an angle with said plane of the opening, so that the end of the dart of the slow jet faces inward of confined space.
  • Said angle of inclination of the median planes of the gas jets by ratio to the plane of the opening generally remains less than or equal to 30 °.
  • This pressure increase (which generally remains around Pascal) is due to the transformation of the dynamic pressure of the recycled fraction of gas under static pressure. She is depending on the value of said angle of inclination and the shape of the mouth suction.
  • the gas curtain (s) involved in the process the invention may (may) have various geometries.
  • n can be curtains of gases generated by linear, polygonal or circular arc nozzles.
  • the plan of gas curtain will describe, therefore, with possibly tilt mentioned above either a plan, or a portion of polyhedron, or a portion of frustoconical surface.
  • the geometry of the gas curtain is obviously adapted to that of the opening to be covered or that of the confined space.
  • the gas curtain formed by the two jets is generated from nozzles which can be located on a horizontal or vertical side the access opening to the confined space.
  • At least one of the jets of said gas curtain is supplied with thermostated gas.
  • the gases supplying said slow and fast jets can have the same characteristics (for example: nature of said gases, temperature thereof ...) or different characteristics.
  • gas curtain or gas curtains
  • gas curtain (s) return flow control usually consists of a double jet curtain of air.
  • the air is replaced by any other suitable gas, in particular an inert gas in one or more two jets.
  • gases injected of the same or different nature, may have characteristics different in particular of temperature, hygrometry, concentration in suspended liquid or solid particles.
  • the invention relates to a device useful for the implementation of the method described above.
  • Said device comprises the means classics necessary for the generation and operation of a gas curtain double jet at an opening.
  • said means are arranged to ensure the expected effect described above, i.e. the injection of a fraction of the slow jet flow, for its self-induction, in the confined space.
  • said gas suction mouth is positioned relative to said two nozzles so that and has a geometry such that a fraction of the slow jet flow is injected into said confined atmosphere and contributes to the induction flow rate of said slow jet; the importance of said fraction varying with the pressure within said confined space.
  • the two nozzles are oriented so that the plane of the gas curtain is tilted, by relative to the plane of the opening, towards the interior of the confined space.
  • the tilt angle as indicated above is between 0 and 30 °.
  • the position and geometry of the suction mouth must allow normal operation of the gas curtain from start-up and creation a slight overpressure in the confined area.
  • the gas suction mouth is arranged opposite, generally in line with the curtain's gas supply. She actually understands a gas receiving cavity which communicates with a discharge pipe from these. Said cavity is advantageously secured to at least one of the walls material which demarcate the opening.
  • the receiving cavity gas is advantageously secured to the base, to the floor of the confined area.
  • the nozzles are arranged in the upper part of the opening and said cavity is located below the level of the base of the area confined (floor of said area). It is advantageously delimited, on the side of the slow jet, by an edge with a concave curvilinear profile, connected to said base of the zone confined. Said edge does not present any edge likely to generate turbulence. Its profile is concave, so that it "accompanies" the deformation of the end of the stinger under the effect of overpressure.
  • the position and geometry of said cavity must allow a normal operation of the gas curtain, in the absence of significant overpressure in the confined area.
  • the end thinned dart of the slow jet arrives at the limit of the curvilinear edge of the cavity. Under the effect of a substantial overpressure, said end will deform and release the along said curvilinear edge a passage for the confined atmosphere (atmosphere, in diluted in gas taken from the slow jet).
  • the confined space is delimited by a ceiling, a floor and at least two side walls.
  • the injection nozzles of the gas curtain (s) are generally located at the level of the ceiling of the opening (openings), the (s) gas curtain (s) is (are) substantially vertical (vertical) and the intake opening is integrated into the floor.
  • the gas receiving cavity associated with said suction mouth is located below the level of said floor and is delimited in width through the walls of the confined space.
  • the confined space is bounded by a circular ceiling, a circular floor and a gas curtain cylindrical or frustoconical.
  • the cavity of the suction mouth, opposite the circular gas injection nozzles constitutes a ditch around said base.
  • the confined space is bounded by a polygonal ceiling, a polygonal floor and a gas curtain polyhedral.
  • the cavity of the suction mouth, opposite the polygonal gas injection nozzles constitutes a ditch around said base.
  • FIG. 1 The confinement according to said FIG. 1 is shown in section. the invention, from the atmosphere B of a chamber 4 for continuous treatment of a product P, by a reagent R injected through the tubing 8.
  • Product P is transported by the conveying system 11.
  • Chamber 4 is delimited by a horizontal ceiling, a horizontal floor, two vertical walls not shown and two curtains of vertical planes.
  • the products P to be treated arrive from atmosphere A (ambient atmosphere, for example), successively cross the air curtain inlet and outlet air curtain and are found in said atmosphere A.
  • Each of said air curtains has a slow jet 2, located on the side of the chamber 4, whose dart 3 is inclined towards the inside of said chamber 4 as well as a jet rapid 1, located on the outside (atmosphere A).
  • the suction system of the gas blown in and a fraction of the confined atmosphere B is placed directly above the injection nozzles 9 and 10.
  • Said suction system includes the cavity of reception of the gases 6 and the discharge conduit 7 of said aspirated gases.
  • Said cavity 6 is delimited on the side of the slow jet 2 by an edge 5 with a concave curvilinear profile which joined the floor of bedroom 4.
  • the gas receiving cavity 6 has a geometry and a positioning compared to nozzles 9 and 10 such as in stationary regime and in the absence of disturbance, the dart 3 of the slow jet 2 is in the equilibrium position, between the atmospheres A and B, shown in solid lines in Figure 1.
  • the gas flow driven by the slow jet 9 in its cross section located at distance L from its origin is divided on the curvilinear edge 5 of the cavity 6 constituting the return mouth of the double throw 1 + 2.
  • a chamber 4 for continuous sterilization of pharmaceutical products P is confined by means of two air curtains. Sterilization is obtained by contact of said products P with a sterilizing gas or nebulized liquid (H 2 O 2 ) at a temperature optimal. To reach and maintain said optimum temperature, two slow thermostatically controlled jets are used. The two air curtains prevent any leakage of H 2 O 2 to the adjacent areas (atmosphere A).
  • a sterilizing gas or nebulized liquid H 2 O 2
  • the inclination of the darts 3 of the slow jets 2 towards the interior of the chamber 4 allows training towards the sterilizing treatment zone (atmosphere B), at the entrance as at the outlet, the contaminating particles which accompany the P products.
  • the depletion effect of sterilizing reagent in the vicinity of the passage exhaust limits losses in said reagent and maintains its concentration at level required for the duration of the treatment by optimizing its consumption.
  • Said containment process is carried out under the conditions below.
  • Room 4 is a 0.5 x 0.5 m section tunnel. An atmosphere of H 2 O 2 at 15 g / m 3 is maintained there.
  • ns are injected through nozzles 9 with a length of 50 cm (length of the tunnel opening) and a width (slit) of 10 cm.
  • the scope of the dart 3 of said slow jets 2 is 60 cm.
  • the return flow corresponds the sum of the speed of the fast jet 1, the slow jet 2, the reagent supply sterilant (variable flow), and possibly from the ambient atmosphere (A) aspirated (variable flow).

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Food Preservation Except Freezing, Refrigeration, And Drying (AREA)
  • Accommodation For Nursing Or Treatment Tables (AREA)
  • Container, Conveyance, Adherence, Positioning, Of Wafer (AREA)
  • Treatments Of Macromolecular Shaped Articles (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Control And Other Processes For Unpacking Of Materials (AREA)
  • Vacuum Packaging (AREA)

Claims (10)

  1. Verfahren zur Einschließung eines Gases (B) in einem Raum (4), der mit dem Äußeren durch mindestens eine Öffnung verbunden ist, ein Verfahren, bei dem in Höhe dieser Öffnung ein Gasvorhang (1+2) erzeugt wird; ein Verfahren, das dadurch gekennzeichnet ist,
    daß der Gasvorhang (1+2) umfaßt:
    einen ersten, sogenannten langsamen Strahl (2), der sich auf der Seite des eingeschlossenen Gases (B) befindet; wobei der langsame Strahl (2) einen Kern (3) einer Reichweite (L) und eines Umfangs aufweist, die ausreichen, um die Öffnung zu bedecken;
    einen zweiten, sogenannten schnellen Strahl (1), der sich auf der Außenseite befindet und die gleiche Richtung hat wie der langsame Strahl (2), und dessen Axialebene parallel zu der des langsamen Strahls (2) verläuft; welcher schnelle Strahl (1) beim Kontakt mit dem langsamen Strahl (2) einen von seiner Innenseite induzierten Durchsatz aufweist, der kleiner als der langsame Strahl (2) oder gleich dem Durchsatz des langsamen Strahls (2) in einem Abstand (L) von seiner Einspeisung ist, der gleich der Reichweite des langsamen Strahls (2) ist;
    mindestens ein Teil des in Form der Strahlen (1+2) eingeblasenen Gases sowie ein Teil des eingeschlossenen Gases (B) in Höhe der genannten Öffnung gegenüber dem Einblasbereich der Strahlen (1+2) aufgenommen werden;
    vorteilhafterweise eine Versorgung des Raums (4) mit geeignetem Gas vorgesehen ist, um zumindest den Teil des aufgenommenen eingeschlossenen Gases (B) zu kompensieren; und
    ein Teil des Durchsatzes des langsamen Gases (2) in das eingeschlossene Gas (B) geblasen wird und zu dem Induktionsdurchsatz des langsamen Strahls (2) beiträgt; wobei der Umfang dieses Teils mit dem Druck im Inneren des Raums (4) schwankt.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß der Raum (4) ein Raum zur kontinuierlichen Behandlung durchlaufender Produkte (P) ist, der vorteilhafterweise in eine Förderstrecke (11) integriert ist.
  3. Verfahren nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, daß die Ebene des Gasvorhangs (1+2) bezüglich der Ebene der Öffnung zum Inneren des eingeschlossenen Raums (4) hin geneigt ist.
  4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß der von einer Seite der Öffnung aus erzeugte Gasvorhang (1+2) eine ebene Form hat.
  5. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß der Gasvorhang (1+2) eine zylindrische, kegelstumpfförmige oder polyedrische Fläche beschreibt.
  6. Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß mindestens einer der Strahlen (1, 2) des Gasvorhangs (1+2) mit thermostabilisiertem Gas versorgt wird.
  7. Verfahren nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß die Gase, welche den langsamen und den schnellen Strahl versorgen, die gleichen oder unterschiedliche Merkmale aufweisen.
  8. Verfahren nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß der Gasvorhang (1+2) ein Luftvorhang ist.
  9. Vorrichtung zur Ausführung des Verfahrens nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß es umfaßt:
    zwei Düsen (9,10), die nebeneinander auf einer Seite der Öffnung angeordnet und mit Vorrichtungen zu ihrer Versorgung mit Gas versehen sind; wobei die Länge dieser Düsen (9,10) mindestens gleich der Länge der Öffnung ist und die Breite der Düsen (9, 10) in Abhängigkeit von der Geschwindigkeit der Strahlen (1, 2) und der Reichweite des zu erreichenden Vorhangs (1+2) bestimmt wird; wobei die Düse, die auf der Seite des eingeschlossenen Gases (B) angeordnet ist, für die Ausgabe des langsamen Strahls (2) und die andere für die Ausgabe des schnellen Strahls (1) geeignet ist;
    eine Ansaugöffnung (6) für mindestens einen Teil des in Form von Strahlen (1, 2) eingeblasenen Gases und einen Teil des eingeschlossenen Gases (B), welche Ansaugöffnung (6) mit einem Ansaugsystem verbunden ist und in Höhe der genannten Öffnung gegenüber den beiden Düsen (9, 10) angeordnet ist;
    vorteilhafterweise ein System zur Versorgung des Raums (4) mit einem geeigneten Gas;
    welche Gasansaugöffnung (6) bezüglich den beiden Düsen (9, 10) positioniert ist und eine solche Geometrie aufweist, daß ein Teil des Durchsatzes des langsamen Strahls (2) in das eingeschlossene Gas (B) eingeblasen wird und zu dem Induktionsdurchsatz des langsamen Strahls (2) beiträgt; wobei der Umfang dieses Teils mit dem Durck im Inneren des Raums (4) schwankt.
  10. Vorrichtung nach Anspruch 9, dadurch gekennzeichnet, daß die beiden Düsen (9, 10) so ausgerichtet sind, daß die Ebene des Gasvorhangs (1+2) bezüglich der Ebene der Öffnung zum Inneren des eingeschlossenen Raums (4) hin geneigt ist.
EP96902323A 1995-02-02 1996-02-01 Verfahren und vorrichtung zum einschliessen eines gases, insbesondere in einem raum für die behandlung kontinuierlich durchlaufender produkte Expired - Lifetime EP0807228B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9501211A FR2730297B1 (fr) 1995-02-02 1995-02-02 Procede et dispositif de confinement, notamment d'une atmosphere particuliere dans un espace de traitement en continu de produits traversants
FR9501211 1995-02-02
PCT/FR1996/000170 WO1996024011A1 (fr) 1995-02-02 1996-02-01 Procede et dispositif de confinement, notamment d'une atmosphere particuliere dans un espace de traitement en continu de produits traversants

Publications (2)

Publication Number Publication Date
EP0807228A1 EP0807228A1 (de) 1997-11-19
EP0807228B1 true EP0807228B1 (de) 1998-11-04

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Country Status (8)

Country Link
US (1) US5934992A (de)
EP (1) EP0807228B1 (de)
AT (1) ATE173078T1 (de)
AU (1) AU4667896A (de)
DE (1) DE69600921T2 (de)
DK (1) DK0807228T3 (de)
FR (1) FR2730297B1 (de)
WO (1) WO1996024011A1 (de)

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FR2756910B1 (fr) * 1996-12-10 1999-01-08 Commissariat Energie Atomique Procede de separation dynamique de deux zones par un rideau d'air propre
FR2757933B1 (fr) * 1996-12-27 1999-01-22 Commissariat Energie Atomique Dispositif de separation dynamique de deux zones par au moins une zone tampon et deux rideaux d'air propre
FR2760199B1 (fr) * 1997-03-03 1999-05-21 Unir Ultra Propre Nutrition In Dispositif de separation de deux zones a ambiances differentes
FR2770330B1 (fr) * 1997-10-24 2000-01-14 Cogema Procede et dispositif de confinement par stratification thermique
US6390755B1 (en) * 2000-04-06 2002-05-21 Motorola, Inc. Exhaust device for use in a clean room, cleanroom, and method
CN1193193C (zh) * 2000-12-21 2005-03-16 松下电器产业株式会社 净化室及半导体装置的制造方法
DE10244463B4 (de) * 2002-09-24 2004-11-18 Siemens Ag Verfahren zum Abrechnen einer kostenpflichtigen Nutzung von durch einen Dienstanbieter angebotenen Diensten
FI20065541A7 (fi) * 2006-09-01 2008-03-02 Sah Ko Oy Menetelmä lämmön siirtymisen rajoittamiseksi seinässä olevan aukon läpi ja ilma verho
BRPI1011893A2 (pt) * 2009-07-03 2016-04-12 Tetra Laval Holdings & Finance método para manter uma barreira de fluxo de gás entre dois volumes de um canal em uma máquina de enchimento, e, dispositivo para manutenção de uma barreira de fluxo de gás entre dois volumes de um canal em uma máquina de enchimento
ITPI20110138A1 (it) * 2011-12-06 2013-06-07 A R I A Engineering S R L Metodo e apparecchiatura per realizzare ambienti delimitati da pareti dâ''aria
FR3032391B1 (fr) * 2015-02-06 2018-09-21 Alstom Transport Technologies Dispositif de generation de rideau d'air, notamment destine a equiper un vehicule ferroviaire
CN106288126A (zh) * 2016-10-26 2017-01-04 广东绿岛风室内空气系统科技有限公司 一种双出风口风幕机

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Publication number Priority date Publication date Assignee Title
FR2530163B1 (fr) * 1982-07-15 1986-08-29 Commissariat Energie Atomique Procede de confinement de la pollution d'un local a l'aide d'une veine gazeuse
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.
FR2659782B1 (fr) * 1990-03-14 1992-06-12 Sgn Soc Gen Tech Nouvelle Procede et dispositif de separation dynamique de deux zones.
US5195888A (en) * 1991-08-19 1993-03-23 Praxair Technology, Inc. Multi-layer fluid curtains for furnace openings
GB2268975B (en) * 1992-07-14 1996-04-24 Northampton Refrigeration Comp Fan assembly for refrigerated display case

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Publication number Publication date
US5934992A (en) 1999-08-10
WO1996024011A1 (fr) 1996-08-08
ATE173078T1 (de) 1998-11-15
DK0807228T3 (da) 1999-07-19
FR2730297A1 (fr) 1996-08-09
FR2730297B1 (fr) 1997-05-09
AU4667896A (en) 1996-08-21
EP0807228A1 (de) 1997-11-19
DE69600921D1 (de) 1998-12-10
DE69600921T2 (de) 1999-05-27

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