EP0906546B1 - Procede et dispositif de protection d'un plan de travail - Google Patents

Procede et dispositif de protection d'un plan de travail Download PDF

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Publication number
EP0906546B1
EP0906546B1 EP97930559A EP97930559A EP0906546B1 EP 0906546 B1 EP0906546 B1 EP 0906546B1 EP 97930559 A EP97930559 A EP 97930559A EP 97930559 A EP97930559 A EP 97930559A EP 0906546 B1 EP0906546 B1 EP 0906546B1
Authority
EP
European Patent Office
Prior art keywords
air
work surface
flow
fact
free side
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
Application number
EP97930559A
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German (de)
English (en)
French (fr)
Other versions
EP0906546A1 (fr
Inventor
Georges Arroyo
Philippe Marchal
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.)
UNIR Ultra Propre Nutrition Industrie Recherche
Original Assignee
UNIR Ultra Propre Nutrition Industrie Recherche
Unir
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 UNIR Ultra Propre Nutrition Industrie Recherche, Unir filed Critical UNIR Ultra Propre Nutrition Industrie Recherche
Publication of EP0906546A1 publication Critical patent/EP0906546A1/fr
Application granted granted Critical
Publication of EP0906546B1 publication Critical patent/EP0906546B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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 present invention relates to close protection of a plane of horizontal work by means of a clean air flow.
  • the invention relates to both a method and a device implementing such a protection.
  • the invention relates more specifically to the protection of a work that is clear, and therefore accessible, both on top and on at least one side, called the free side, of this work plan.
  • a clean room - in which the air is filtered and treated to present a given level of cleanliness.
  • a disadvantage of this solution is the difficulty of maintaining a air quality in a large volume at acceptable economic conditions.
  • a another disadvantage is related to the fact that the personnel must be dressed in a special dress, itself sterile, whose cleanliness is difficult to maintain an and to control, and whose wearing is tedious.
  • the staff and equipment present in the work room can be sources of air pollution.
  • the close protection technique provides a solution to this problem.
  • the work surface is thus protected by a clean air shield which puts the protected from external contamination, although the rest of the room in which finds the work plan contains air likely to be polluted, the personnel assigned to tasks relating to said objects which may therefore be subject to constraints less strict hygienic.
  • This work plan can be a fixed tray, on which are placed items to be processed or subjected to any operation, either manual or automated.
  • It can also consist of a carrier, for example a carpet mobile, which successively brings articles to be treated to the work station, and then evacuated when the operation is complete.
  • a carrier for example a carpet mobile, which successively brings articles to be treated to the work station, and then evacuated when the operation is complete.
  • the articles are for example containers which are transported to the tail leu leu by the moving belt, and which is filled by a dispensing head arranged in the protected area, so that the filling product is free from contamination.
  • the document FR-A-1 257 562 relates to a device for maintaining an atmosphere with specific characteristics in an open room of a side.
  • This room has a floor constituting a work surface horizontal above which flows a clean air flow.
  • the room is open on only one of its sides, accessible to a operator, and this side is traversed by a second stream of clean air, which affects the shape an approximately vertical curtain, directed from top to bottom.
  • Air is drawn in at the front edge (open side of the chamber) of the working surface and is recycled via an atmosphere regeneration device, so that his journey is on a closed circuit.
  • the horizontal air flow which crosses the interior of the chamber, presents almost constant speed distribution over the entire height of the chamber; the value of the speed is independent of the height of the point considered in relation to the work surface.
  • the device which is the subject of document EP-A-0 375 343 comprises a horizontal work surface which is clear both on the top and on one of its sides.
  • This chamber produces a double flow, namely a horizontal flow passing above the worktop, and a multi-directional flow formed of a plurality of small jets produced by holes formed in the various partitions of the chamber.
  • Cylinder arc shaped guides lining the interior of this chamber ensure the deflection of air from the box to produce the flow horizontal above.
  • this known device has the advantage of its accessibility both by one side of the worktop and from the top, it has the disadvantage that the distribution of the horizontal flow velocities, above the work plane, is constant.
  • the present invention aims to overcome these drawbacks by proposing a method and a device of close protection which, while allowing a good accessibility to the work surface, ensures perfect protection of the items placed on this work plan.
  • the invention also relates to a close protection device a horizontal worktop by means of a clean air flow, in which the worktop work is clear and accessible both on top and on at least one side, called side free.
  • carrier is meant both a single carrier than a group of two or more than two carriers arranged side by side, for example several adjoining carpets.
  • the reference 1 has designated a work surface which, in this case, is a fixed horizontal tray, of rectangular shape, supported by a base 11 placed or fixed to the ground S.
  • the upper face 10 of the work surface is intended to receive articles to be subjected to any manipulation and / or treatment which must operate in a clean atmosphere.
  • transverse edges 10c are in abutment against a pair of transverse partitions 12 which extend upwards at a certain height relative to at work plan level 1.
  • the box 2 is fixed to the plate 1 and / or to the base 11 by members appropriate, not shown.
  • a system 4 for generating an air flow consisting of one or more electric fan (s) able to draw air from the inlet 20 of the box, edge side 10b, to inject it on the other side, on the edge side 10a.
  • the air inlet portion 20 of the box has a smaller section than the main portion 22 which receives the generator 4.
  • This portion 20 constitutes a suction mouth located under the plate 1, just near ledge 10b.
  • the transition between the narrowed portion 20 and the portion main 22 is done via a divergent portion 21.
  • the main portion 22 opens into a semi-cylindrical guide 3, whose radius corresponds to the height of the portion 22, and whose axis of revolution is located at the edge 10a location.
  • Guide 3 the inner wall of which is referenced 30, opens out above of the tray 1, directly above the edge 10a.
  • box 2 and the guide 3 are closed on their sides transverse, by appropriate transverse walls.
  • an air purification or filtration device 5 composed for example of one or several filter pads.
  • the filter elements are of known type, adapted to retain the impurities or particles in the air supplied by the generator 4.
  • composition and porosity of these elements are chosen according to the application, and in particular according to the degree of cleanliness required.
  • FIG. 1 The operation of the device is illustrated in FIG. 1, arrows symbolizing the path of the air intended to protect the bottle A located on the work surface.
  • the length of the different arrows was chosen so that it is approximately proportional to the speed of the air flow at the location considered.
  • the device represented in FIGS. 1 and 2 constitutes a work station for a person (not shown) assigned to a certain task on article A , this person standing on the free side of the device, referenced 100, side which corresponds to the edge 10b.
  • This side 100 will conventionally be called "free side”.
  • the other side, referenced 101, where the guide 3 is located will be called “side upstream”, by reference to the direction of movement of the clean air flow above the plane of job.
  • the spaces 100 and 102 being clear and accessible, the operator can move place without difficulty near the work surface, handle the articles to be treated, and can involve different instruments or materials, for example mobile fillers located in the upper space 102.
  • the generator 4 having been started, it will continuously suck a flow of air through the mouth 20, as symbolized by the arrow a .
  • the air flow leaves the box 2, as symbolized by the arrows b , and is deflected 180 ° inside the semi-cylindrical guide 3.
  • the external vein which becomes the upper vein - or high vein - V 1 , has a speed significantly greater than the rest of the flow.
  • This vein has been materialized by cross-hatching in FIG. 1, while the rest of the flow, or lower vein, is referenced V 0 .
  • vein V 0 there is a gradient of velocities, the latter being very low, or even zero, in the vicinity of the face 10, to gradually increase upward, up to the vein V 1 .
  • the radius of the guide 3, which determines the height of the air flow supplied by the guide above the work surface, is preferably chosen according to the height of the articles A considered, so that these articles are immersed in the lower flow V 0 .
  • the axis of revolution of the semi-cylindrical guide 3 coincides substantially with the edge 10a.
  • This provision is not mandatory.
  • the position of the axis could be shifted, up or down, and the radius modified to adjust the intensity of the speeds of V 0 and V 1 .
  • the high vein V 1 plays the role of a vault-shaped shield which protects all the space above the surface 10, which it shelters from pollution of the ambient air, being in the open upper space 102 and on the open side 100.
  • the air flows from the lower vein V 0 and from the upper vein V 1 are respectively symbolized by the arrows d and e .
  • the air is thus recycled, at least for the most part; like him it is practically clean air, or for the most part clean, the clogging of the elements filtering is done slowly.
  • This air circulation is continuous, as long as there are items to protect on the work surface.
  • the flow of the clean air flow above of the work plan is not disturbed, or is practically not disturbed, when neighborhood of the transverse sides 10c of the work plan.
  • the device illustrated in FIG. 3 comprises a work plan 1 which is constituted not by a fixed plate, but by a transporter, and more precisely by the upper strand - or "go" strand 13 - of a moving endless belt.
  • the return strand extends under the outward strand 13.
  • the upper strand 13 transports objects, for example bottles A.
  • the device according to the invention is therefore installed on the trajectory of the carrier, to ensure the protection of a portion of it.
  • suction mouth 20 at the inlet of the box 2, with its opening directed horizontally, opposite the space located just above the worktop 1.
  • This suction mouth 20 is bent downwards, according to a quarter of cylinder, for connection to a vertical tubular portion 200 extending along the side free 100.
  • the tubing 200 is itself connected to box parts 21 and 22 which are similar to those of the first embodiment, and which are installed below the return belt strand 13 'and its support rollers 14' , near the ground S.
  • the generator 4 is mounted, composed of a or multiple fans.
  • the box 22 Via a right angle bend 23, the box 22 itself opens into a vertical pipe, or chimney 6 arranged on the upstream side 101.
  • tubing 6 is connected, in its upper part, to a guide 7 in shape of quarter cylinder which opens near the work surface 1, upstream side.
  • One or more filter (s) 5 is (are) mounted at the outlet of the fans 4, for example at the base of the chimney 6.
  • the guide 7 which channels the clean air flow at its inlet above the deflected worktop air only on a quarter of circumference (90 °).
  • the velocity gradient is such that there is not a significant difference between the velocities measured in the high vein V 1 and in the rest of the flow V 0 .
  • FIGS. 3, 5 and 6 provision is made a series of three deflectors 60.
  • the internal deflector - that is to say facing towards the plane working -, referenced 60a, in Figures 5 and 6 is a vertical flat plate.
  • the external plate referenced 60c in this same figure is composed a vertical lower zone, of limited height, its main part forming an angle acute with respect to the vertical, direction directed upwards and outwards.
  • the intermediate deflector 60b is a plate also inclined by vertical, in the same direction as the deflector 60c, but with a more angle low.
  • the series of deflectors 60 therefore presents, side view (FIG. 6) the appearance general of the members of a fan which diverges upwards, i.e. downstream if the displacement of the air in the chimney 6 is considered.
  • the air flow at the base of the chimney 6 has been designated by the arrows F.
  • the air flow is deflected more and more towards the outside, as symbolized by the arrows G and H.
  • the guide 7 is also internally lined of a set of three deflectors 70.
  • the internal deflector is assigned the index a , the intermediate deflector of the index b and the external deflector of the index c .
  • deflectors are curved plates, in the shape of a cylinder arc coaxial with guide 7.
  • the deflector 70a is positioned so as to channel the innermost vertical flow F , to give it a horizontal orientation (arrow F ' ).
  • deflectors 70a and 70b are channeled most of the air flow from the space between the deflectors 60a and 60b (arrow G ' ), while the deflectors 70b and 70c channel most of the current d between them. 'air from between deflectors 60b and 60c (arrows H' ).
  • the presence of curved deflectors inside the guide 7 is essential when, as is the case in the second embodiment, the device does not has no transverse partitions delimiting the protected space in the direction longitudinal - as was the case with the partitions 12 of the first embodiment -.
  • the operation of the device which is the subject of the second mode of embodiment of FIG. 3 is entirely similar to that of the first embodiment, the air being mainly recycled after sweeping the worktop, by suction to through the mouth 20, passage in the fan 4 and in the filter 5, deflection and pipe in chimney 6 and guide 7.
  • the generator - for example fan - 41 draws ambient air for the propel after filtration or purification, via a box 8, above work surface 1.
  • the suction mouth 20 is connected, via a conduit 2, to a vacuum cleaner 40 separate from the fan 41.
  • the box 8 is arranged on the upstream side of work plan 1 - which can be either a fixed platform or a conveyor -.
  • the fan 41 is located at the base of the box.
  • the box has a flared portion 81 which opens out upwards in a substantially vertical duct 8a extending by a guide approximately quarter-cylinder 8b.
  • An internal deflector composed of a flat part 800a extending obliquely upward and outward and extending in guide 8b with a arc-shaped portion of cylinder 800b, coaxial with the wall of guide 8b, ensures the correct distribution of speeds above the work surface.
  • the air flow is composed of a high vein V 1 , of high speed, which protects a lower vein of reduced speeds V.
  • V 1 of high speed
  • V 2 of reduced speeds
  • the air flow generated by the fan (s) will of course be directly dependent on these dimensions, as well as the speed of circulation of the flow.
  • the fourth embodiment illustrated in Figures 7 and 8 includes a air blowing system 6, 7 similar to that of FIGS. 5 and 6, and the same references have been used to designate identical or similar elements.
  • the guide 7 which channels the air above the plane of work 1 is extended at the outlet by an overhanging part - or visor 71 - which overhangs the upstream border zone of plane 1 and is slightly inclined downwards with respect to the horizontal.
  • this visor 71 The function of this visor 71 is to slightly fold down the high vein V 1 to orient it towards the top of the suction mouth 20 and to reduce air leaks above this mouth.
  • a partition 24 Inside the suction pipe 200 are mounted a partition 24 and a flow retarder element 25.
  • the partition 24 is disposed in the upper part of the tube 200, near of its outer wall.
  • the shape of the partition 24 is similar to that of the portion of the wall external facing which it is located, these two elements forming a channel whose upper part forms a quarter-circle and whose lower part is rectilinear and vertical.
  • the element 25 is fixed against the internal wall of the tube 200. It comprises, from top to bottom, an upper face 250 forming a converging dihedron with the lower portion of the partition 24, a vertical face 251 substantially in the extension of this portion, and a divergent face 252.
  • Elements 24 and 25 divide the suction mouth 20 into two secondary outlets, one upper and outer 20b of constant section and the other lower and inner 20a of decreasing section up to a throttle located at the level from the mouth exit area 20b.
  • This arrangement has the advantage of creating in the suction tube 200 a vertical distribution of speed homologous to that which was created on the blowing side. Mouth suction 20 is done with a higher air speed in its part high.
  • the vein V 1 of high speed is stabilized and its tendency to rise under the effect of external disturbances (drafts), or to fall back towards the work plan, is reduced.
  • the upper secondary mouth 20b in which the air flow is direct (without pressure drop) captures almost all of the upper vein V 1 .
  • the slowing of the flow in the mouth 20a forms an air mattress which prevents the high vein V 1 from falling back down.
  • This embodiment is particularly recommended when there is no transverse partitions (referenced 12 in Figures 1 and 2) bordering the sides (referenced 10c) of the work plan.
  • Figure 9 shows, by way of example, a possible distribution of speeds above the work plane in the central zone of the latter, within a flow clean air having a height of 0.30 m.
  • the outside air is assumed to be stationary.
  • the curve in FIG. 9 represents the distance (height) X , in meters, from the measurement point in relation to the upper face of the work plane.
  • This range corresponds to the low speed vein V 0 .
  • the increase in speed is then smaller; we reach a level and the air speed is almost constant, of a value close to 0.8 m / s, in the area of height between 0.18 and 0.25 m.
  • the speed then drops sharply, becoming close to zero to one 0.30 m high, where the polluted ambient air is found.
  • FIG. 10 shows an installation for depositing topping products on a base which is moved continuously by means of a mat carrier 13.
  • the advance of the conveyor is referenced D 1 , while the covering removal tool is referenced 90.
  • the conveyor 13 has a width of 1.5 m and a speed 5 to 10 m / min in advance.
  • the transporter passes inside a protected area by means of a device according to the invention, the outline of which is shown diagrammatically by a broken line, and which is designated D.
  • the installation illustrated in FIG. 11 comprises a conveyor belt 13, the advance of which is done step by step, as symbolized by the arrow D 2 .
  • the mat 13 transports thermoformed trays B intended to receive a product, for example a food product, which is supplied by dosing or manual filling tools 91.
  • Each tool 91 is assigned to a tray, the latter being transported in adjacent rows by the mat 13.
  • the close protection device D is installed at the level of tools 91.
  • FIGS. 12 to 14 relate to modeled flows, calculated by computer.
  • the air enters the guide according to a uniform distribution of the speeds, the value of the speed being E.
  • white arrows are represented, whose length is proportional to the speed intensity.
  • the speed distribution is represented by a gradation of gray, going from lighter to darker in the direction of increasing speed.
  • the speed value is given by the scale shown in the drawing.
  • FIG. 12 corresponds to a similar configuration to that of the first embodiment, using a semi-cylindrical guide.
  • the height of the flow leaving the guide is 0.30 m; the width of the plane work 1 is 0.60 m; the thickness of the worktop is 6 cm; mouth height suction is 9 cm.
  • the drawing shows the existence of an almost static space (light gray) above the work plan and visualize the high vein, high speed (very dark gray) which forms a shield overhanging the worktop and surrounding the edge free up to the suction mouth.
  • Figures 13 and 14 relate to devices similar to the second embodiment ( Figure 3).
  • the width of the work plan is 0.60 m whereas in that of Figure 14 it is 1.20 m.
  • the device according to the invention is not necessarily associated with a processing operation for articles supported or transported by the work surface.
  • the invention can also be implemented to equip a simple transfer facility, from one place to another, of sensitive products, so that the products transported are protected from the external environment, possibly polluted.
EP97930559A 1996-06-21 1997-06-20 Procede et dispositif de protection d'un plan de travail Expired - Lifetime EP0906546B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9607961A FR2750199B1 (fr) 1996-06-21 1996-06-21 Procede et dispositif de protection rapprochee d'un plan de travail au moyen d'un flux d'air propre
FR9607961 1996-06-21
PCT/FR1997/001106 WO1997049955A1 (fr) 1996-06-21 1997-06-20 Procede et dispositif de protection d'un plan de travail

Publications (2)

Publication Number Publication Date
EP0906546A1 EP0906546A1 (fr) 1999-04-07
EP0906546B1 true EP0906546B1 (fr) 2000-04-26

Family

ID=9493450

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97930559A Expired - Lifetime EP0906546B1 (fr) 1996-06-21 1997-06-20 Procede et dispositif de protection d'un plan de travail

Country Status (12)

Country Link
US (1) US6095918A (da)
EP (1) EP0906546B1 (da)
JP (1) JP2000512730A (da)
AT (1) ATE192228T1 (da)
CA (1) CA2259455C (da)
DE (1) DE69701803T2 (da)
DK (1) DK0906546T3 (da)
ES (1) ES2146108T3 (da)
FR (1) FR2750199B1 (da)
GR (1) GR3033981T3 (da)
PT (1) PT906546E (da)
WO (1) WO1997049955A1 (da)

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US6312328B1 (en) * 1998-07-08 2001-11-06 Nippon Sanso Corporation System and method for producing and supplying highly clean dry air
FR2785040B1 (fr) * 1998-10-22 2001-01-19 U N I R Ultra Propre Nutrition Dispositif et procede pour la protection rapprochee de produits ou objets sensibles a des agents contaminants vehicules par l'air ambiant
US6623352B2 (en) * 1999-05-21 2003-09-23 Vortex Holding Company Vortex air barrier
DE102004026883B4 (de) * 2004-05-27 2014-12-24 Inova Pharma Systems Gmbh Anordnung zum sterilen Abfüllen
US8522770B2 (en) * 2008-08-26 2013-09-03 Sa Vent, Llc Recirculating, self-contained ventilation system
ES2488716T3 (es) * 2011-04-29 2014-08-28 H.Opdam Management B.V. Una cortina de aire, y un vehículo provisto de dicha cortina de aire
US8978683B1 (en) * 2011-10-06 2015-03-17 Zeeland Wood Turning Works, Inc. Method of reducing downward flow of air currents on the lee side of exterior structures
RU2497048C1 (ru) * 2012-07-03 2013-10-27 Открытое акционерное общество "ЦНИИПромзданий" Воздухораспределительное устройство для рабочего стола
US9822532B2 (en) * 2014-11-25 2017-11-21 George John Sherry Gable vent that blocks fire, rain and water
JP6238918B2 (ja) * 2015-02-05 2017-11-29 株式会社ケイズベルテック 異物付着防止方法及び装置
US10274224B2 (en) * 2015-11-04 2019-04-30 Modine Manufacturing Company Discharge plenum for packaged HVAC unit
US10174961B2 (en) 2015-12-16 2019-01-08 Harley Ellis Devereaux Corporation Open fume capture and exhaust ventilated work station
FR3065177B1 (fr) * 2017-04-18 2021-12-03 Osmose Dispositif d'extraction de vapeurs ou poudres toxiques et procede de mise en oeuvre
DE102019125845A1 (de) * 2019-09-25 2021-03-25 Krones Aktiengesellschaft Vorbehandlungsmaschine und Vorbehandlungsverfahren für Behälter
US20220010994A1 (en) * 2020-07-08 2022-01-13 Michael M. Kurmlavage Cashier Station Vertical Air Curtain Attachment

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US2119282A (en) * 1936-08-24 1938-05-31 Vilbiss Company Inc De Spray booth
US4696226A (en) * 1986-08-28 1987-09-29 Witmer Warner H Fluid barrier curtain system
GB8829845D0 (en) * 1988-12-21 1989-02-15 Howorth Frederick H Sterile air trolley
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.
FI88541C (fi) * 1991-04-23 1993-05-25 Ilmateollisuus Oy Foerfarande och anordning foer att aostadkomma en luftvaexling foer ett behandlingsrum
JPH06213488A (ja) * 1993-01-18 1994-08-02 Nippon Muki Co Ltd コンベア用空気清浄装置
JPH06221639A (ja) * 1993-01-21 1994-08-12 Takasago Thermal Eng Co Ltd クリーンブース

Also Published As

Publication number Publication date
EP0906546A1 (fr) 1999-04-07
US6095918A (en) 2000-08-01
DK0906546T3 (da) 2000-09-11
CA2259455A1 (fr) 1997-12-31
PT906546E (pt) 2000-09-29
ES2146108T3 (es) 2000-07-16
GR3033981T3 (en) 2000-11-30
DE69701803T2 (de) 2000-10-19
FR2750199A1 (fr) 1997-12-26
ATE192228T1 (de) 2000-05-15
WO1997049955A1 (fr) 1997-12-31
JP2000512730A (ja) 2000-09-26
FR2750199B1 (fr) 1998-09-11
DE69701803D1 (de) 2000-05-31
CA2259455C (fr) 2004-10-26

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