EP2848873B1 - Device for protecting an operation area and corresponding method - Google Patents
Device for protecting an operation area and corresponding method Download PDFInfo
- Publication number
- EP2848873B1 EP2848873B1 EP14177330.9A EP14177330A EP2848873B1 EP 2848873 B1 EP2848873 B1 EP 2848873B1 EP 14177330 A EP14177330 A EP 14177330A EP 2848873 B1 EP2848873 B1 EP 2848873B1
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- EP
- European Patent Office
- Prior art keywords
- plate
- stage
- diffusion
- openings
- called
- Prior art date
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- 238000000034 method Methods 0.000 title claims description 4
- 238000009792 diffusion process Methods 0.000 claims description 87
- 239000012530 fluid Substances 0.000 claims description 54
- 239000004698 Polyethylene Substances 0.000 claims description 6
- 239000004033 plastic Substances 0.000 claims description 6
- 229920003023 plastic Polymers 0.000 claims description 6
- -1 polyethylene Polymers 0.000 claims description 6
- 229920000573 polyethylene Polymers 0.000 claims description 6
- 230000001105 regulatory effect Effects 0.000 claims description 6
- 238000011144 upstream manufacturing Methods 0.000 claims description 4
- 238000011045 prefiltration Methods 0.000 claims description 3
- 239000000523 sample Substances 0.000 claims description 3
- 210000004027 cell Anatomy 0.000 claims 3
- 210000003850 cellular structure Anatomy 0.000 claims 1
- 241000264877 Hippospongia communis Species 0.000 description 13
- 238000007664 blowing Methods 0.000 description 9
- 230000004907 flux Effects 0.000 description 9
- 238000000926 separation method Methods 0.000 description 8
- 238000011084 recovery Methods 0.000 description 6
- 238000009423 ventilation Methods 0.000 description 3
- 230000033228 biological regulation Effects 0.000 description 2
- 230000003749 cleanliness Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 239000002759 woven fabric Substances 0.000 description 2
- 239000004952 Polyamide Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920006149 polyester-amide block copolymer Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000010408 sweeping Methods 0.000 description 1
Images
Classifications
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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
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/08—Air-flow control members, e.g. louvres, grilles, flaps or guide plates
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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
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/08—Air-flow control members, e.g. louvres, grilles, flaps or guide plates
- F24F13/082—Grilles, registers or guards
- F24F2013/088—Air-flow straightener
-
- 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 generally relates to the protection of a zone of operation.
- the invention relates more particularly to a device for protecting an operating area, in particular for handling products, and a corresponding handling method.
- a device according to the preamble of claim 1 is known, for example, from the document US-4-3530781 .
- blowing / suction means are located near the handling zone to control the flow of air in order to obtain the stability of the air flow with a low speed and a temperature adapted to the comfort of the operators.
- blowing / suction means close to the operators can be an inconvenience for the user by the physical and / or visual clutter they impose.
- the operator may also be inconvenienced by the airflow when his face is exposed.
- the document US3660956 describes an equipment ventilation grid with a vertical airflow outlet.
- the document US3530781 also describes a ventilation grid of a buried installation.
- the document FR2353808 describes a ventilation box for roofing of a building. None of the installations described above are intended to allow an operator to stand on one side of the plant and handle products at the plant level by protecting the handling area of the products from external pollution.
- the object of the invention is to propose a device for protecting a zone of
- the document EP2522921 discloses a cleaning apparatus having an air outlet direction inclined with respect to the air inlet direction. manipulation, also called operating field, to improve the handling conditions.
- the subject of the invention is a device for protecting an operating zone, in particular for handling products, according to claim 1.
- the rectifying stage makes it possible to straighten the fluid which arrives at the input of the plate, in particular when it arrives substantially parallel to the plate, that is to say substantially parallel to the underside of the plate.
- the orientation stage located above that is to say downstream of the rectifying stage, makes it possible to orient the rectified flow in the desired direction by limiting the losses of charge and the defects of homogeneity. the velocity of the flux at the plateau diffusion surface relative to a configuration in which the flow would not previously be rectified.
- the diffusion screen allows, thanks to its reduced openings, to form a substantially flat work surface, on which objects can be placed with a reduced risk of falling or jamming in the openings of the tray.
- Such a combination makes it possible to direct the flow in an oblique direction relative to the normal to the plate to allow an operator to position himself on the opposite side of the flow in order to limit the exposure of his face to the flow, while limiting the losses. charging the flow and providing a substantially flat handling surface, with a reduced risk of falling object in the openings of the tray.
- the inclined portion of the separation zone extends the parallel portion to the free end or outer edge side of the tray. Such inclination of the portion of the separation zone between the rectifying stage and the orientation stage located on the side of the slice of the plate makes it possible to obtain, in particular on the side where the operator is located, a fluid diffusion with stable aerodynamic characteristics, while maintaining an orientation of the flow in the direction of a gap with respect to the operator.
- Said high point of the inclined portion is closer to the upper face than the lower face and is located on or near the free end side, also called the outer edge, of the plate at which the operator is positioned.
- the separation zone between the two rectifying and orienting stages thus comprises a non-planar surface having a high point close to the side, also called the outer slice, of the plate where the operator stands with respect to the lowest point closer to the center. of the plateau.
- the upper surface of the plate is supplied with air over its entire surface, even on the side of the plate where the operator is located.
- Such an arrangement of the inclined portion thus preserves the side of the plate where the operator stands, perpendicular to the upper and lower faces of the plate, while ensuring air diffusion over the entire upper surface of the plate itself close to the operator and with a reliable tilt effect at the outer edge due to the entrainment of said diffused flux at the end edge, by the flux diffused at the center of the upper surface of the tray.
- the inclined portion is rectilinear.
- the inclined portion is curved, and the center of curvature of the inclined portion is oriented towards the upper face said plateau.
- the inclined portion it is possible for the inclined portion to extend the parallel portion tangentially.
- the thickness of the diffusion screen is smaller than that of the orientation stage or the recovery stage.
- said device comprises a panel, called a working plane, preferably of thickness substantially equal to that of the diffusion plate, which extends the diffusion plate on the side of a slice, called inner slice of the scattering plate, opposed to the slice, said outer slice, at which an operator is able to position himself to manipulate products above the diffusion plate, and said second direction corresponding to the orientation of the openings of the orientation stage is chosen so as to direct the flow of fluid in the upper face of the plate away from the outer edge of the diffusion plate.
- said high point is located on the or near the upper outer edge of the diffusion plate, defined by the junction of the upper face of the plate and said outer edge.
- the orientation stage and / or the recovery stage comprises a honeycomb structure, preferably a honeycomb structure, said cells forming the openings of said stage.
- the cells of the orientation stage are offset with respect to the cells of the recovery stage with which they communicate.
- a honeycomb structure of the orientation stage and / or the floor of straightening makes it possible to contribute to the laminarization of the fluid flow and to guide the flow by limiting the pressure drops, while forming a rigid support for the diffusion screen.
- the honeycomb structure could be replaced by another honeycomb structure, or other apertured structures, while having similar guides to guide the flow, such as curved sipes, or tubes bent.
- the characteristic size of the passage section of each cell for example the diameter of the inscribed circle, is at least three times smaller than its height.
- said diffusion screen is formed by a woven fabric, preferably made of plastic, such as polyethylene.
- said device comprises a box having an air inlet and an air outlet opening on the lower face of the diffusion plate, and a fan arranged, preferably inside the box, for circulating a flow of fluid from the inlet to the outlet of said housing.
- said device comprises means for regulating the speed of the fluid flow, said speed regulating means comprising a speed sensor and a fan control unit according to the speed of flow of the fluid. fluid acquired by the sensor to maintain the speed of the fluid flow at the output of the diffusion plate substantially equal to a set value.
- said speed sensor comprises a housing which extends through a wall of the box and in which are formed a fluid inlet on the side of the interior of the box and a fluid outlet on the side. from the outside of the box, said housing housing a probe for acquiring the speed of the flow of fluid flowing between the inlet and the output of the housing, and said sensor is designed to generate a pressure drop, vis-à-vis the fluid passing through it, substantially equal to that generated by the diffusion screen.
- said speed sensor is located between the fan and the air outlet of the box.
- said device comprises a filter, called prefilter, located upstream of the fan, preferably at the inlet of said box, and / or a filter, located downstream of the fan, preferably between the fan and the speed sensor.
- said box is located under the plane passing through the lower face of the diffusion plate.
- the invention also relates to a method of handling products above a plate, called a diffusion plate, characterized in that said diffusion plate is part of a protection device for an operation zone as described herein. above and for which the fluid flow diffused on the upper face is oriented in a direction oblique with respect to the normal to the plate, and in that an operator is positioned on the side of the plate which is opposite to the direction direction of said flow of diffused fluid in the upper face.
- the invention relates to a device for protecting an operating zone 100, in particular for handling products of different types.
- Said device comprises a plate 2, called a diffusion plate, having two opposite faces, one said upper face 202, oriented towards the operating zone 100, and the other, said lower face 200.
- Said diffusion plate 2 comprises a first stage, called a righting stage 20, a second stage, called an orientation stage 21 and a third stage, called a diffusion screen 22.
- Said stages each have openings for the passage of a flow of fluid 7, for example air.
- Said tray is intended to be used in a room.
- Said tray is located at a distance from the ground so that the operator can stand up by handling products above said tray.
- the upper face 202 of said plate is located at a height adapted to the ground, for example between 0.6 and 1.7 meters, to allow an operator, who is standing, to handle the products comfortably. This height is adjusted if the working position differs from the standing position, so that the upper face of the plate remains accessible to the operator.
- the openings 205 of the rectifying stage 20 open on the lower face 200 of the diffusion plate 2 and communicate with the openings 215 of the orientation stage 21.
- Said openings 205 of the rectifying stage 20 are configured to orient the flow of fluid, entering the diffusion plate 2 by its face lower 200, in a first direction, for example vertical.
- the axis of each of the openings of the rectifying stage 20 is thus perpendicular to the lower face 200 of the plate.
- the openings 215 of the orientation stage 21 communicate with the openings of the diffusion screen 22.
- the thickness of the diffusion screen 22 is very small compared to that of the other stages so that the openings of this screen are not shown in the figures.
- Said openings of the orientation stage 21 are configured to orient the flow of fluid 7, leaving the openings of the recovery stage 20, in a second direction oblique with respect to said first direction.
- said axis of each opening of the orientation stage 21 is inclined relative to that of each opening of the 20 up stage, so that the opening passages defined by the openings between the lower face 200 and the upper face 202 of the plate 2 each have a bent direction.
- Each opening of the diffusion screen 22 opens on the upper face 202 of the plate 2 and has a passage section whose surface is smaller than that of each of said openings 215 of the orientation stage 21 as well as that of the openings 205 of the righting stage 20.
- Said plate 2 thus has a plurality of through passages allowing a flow of fluid to pass from one face 200 to the other 202 of said plate 2, that is to say allowing the diffusion of a fluid on the side of the upper face of the tray facing the operating zone 100, while straightening the incoming flow on the side of the lower face, then tilting it to diffuse it through the screen 22 at the level of the area of operation100.
- the diffused stream exits the upper face with the inclination defined by the openings of the orientation stage.
- the diffused flux is thus inclined with respect to the upper face 202 of the plate.
- the inclination is chosen so that the flow exiting the plate is distributed in the direction of a spacing relative to the free end edge of the plate at which the operator is intended to position themselves to manipulate the products.
- Such a plateau design thus makes it possible to limit the risk of diffusion of the flow on the operator's head so that the operating zone above the plateau is protected by the flow diffused with respect to external pollution while maintaining a working comfort for the operator who remains on the side of said free end edge of the tray, can keep his trunk and his head away from the air flow diffused.
- the separation zone 201 of the straightening stage 20 and of the orientation stage 21 has a part 201a substantially parallel to the upper face 202 of the diffusion plate 2, located at the central part of the plate, and an inclined portion 201b from a low point PB in the extension of the parallel portion 201a to a high point PH spaced from the center of the plate relative to the low point and located at the free end edge.
- the diffusion plate has a free end side, also called external edge, at which the operator is positioned to handle products on and / or above said plate 2.
- said high point PH is located on the upper edge of the plate 2 which forms the junction edge between the upper face 202 of the plate and the outer edge 212.
- Said part inclined from a low point PB up to a high point PH separated from the center of the plateau with respect to the low point may be a straight part forming a rectilinear slope as illustrated in FIG. figure 3 .
- said inclined portion 201 may be a curved portion, for example in a circular arc that extends from the low point PB in the extension of the parallel portion 201b to the high point PH with a center of curvature located on the upper face side 22 of the plate 2.
- the flux diffused in the upper face near the outer edge 212 is slightly lower than elsewhere. The speed profile decreases towards said outer edge, which reduces the entrainment of external pollution at the edge.
- the outer edge 212 is perpendicular to the upper and lower faces of the plate.
- the inclined portion of the separation zone extends the parallel portion to the outer edge of the tray. Such inclination of the portion of the separation zone 201 between the rectifying stage 20 and the orientation stage 21 situated on the side of the slice 212 of the plate, makes it possible to obtain a diffusion of fluid at the outlet of the plate 2 even close to the operator while maintaining an orientation of the flow in the direction of a spacing relative to the operator.
- said high point PH is located on the or near the upper outer edge of the diffusion plate 2, defined by the junction of the upper face 202 of the plate and said outer portion 212.
- Said second direction corresponding to the orientation of the openings 215 of the orientation stage 21 is chosen so as to direct the flow of fluid 7 in the upper face 202 of the plate 2 away from the outer edge 212 of the plateau of diffusion 2, to prevent the operator is embarrassed by this flow.
- this orientation is achieved by inclination of the flux through the plate 2 of diffusion with respect to its direction of entry into the plate 2 that impresses the rectification stage 20.
- said device comprises a working plane 1, preferably of thickness substantially equal to that of the plate 2 of diffusion, which extends the diffusion plate 2 at least on the side of the slice 211, called the inner slice, of the diffusion plate 2.
- Said inner slice is defined in contrast to the external slice 212 at which an operator 9 is able to position itself to manipulate products above the plate 2 diffusion.
- the diffusion plate is positioned in a through opening provided at or near an end of the work plane.
- each opening of a stage forms, with the openings of the two other stages with which it communicates, a fluid passage duct.
- the volume VF of the diffusion plate 2 delimited between the inner wafer 211 and the fluid flow passage ducts which open on the upper face 202 in the immediate vicinity of the work plane 1, that is to say on the of the internal slice 211, is closed by the slice 101 of the worktop 1, so that the volume VF is a "dead" volume which can thus be replaced by a solid material without affecting the diffusion of the flow in the upper face of the tray.
- the orientation stage 21 and the rectifying stage 20 each have a honeycomb structure, preferably honeycomb. Said cells then form the openings of said stage. The axis of the cells of the orientation stage 21 is thus inclined with respect to that of the cells of the rectifying stage.
- each honeycomb is such that the cells are contiguous in a regular polygonal pattern.
- circular-based cells are contiguous in a hexagonal pattern.
- the superposition of the two honeycombs can be such that the cells are offset at the junction, and that the vacuum, that is to say the passage of air, honeycomb honeycomb meets the full, that is to say, the partition, the other Honeycomb.
- the rectification stage 20 comprises a honeycomb with cavities of 3 to 6 millimeters in diameter, orthogonal to the upper face 202 of the plate, and that the stage 21 comprises a honeycomb with cells of 3 to 6 millimeters in diameter, at 45 ° oblique direction relative to the upper face 202 of the plate.
- the thickness or height of the diffusion plate is of the order of 50 millimeters.
- the offset between the openings of the straightening and orientation stages, in a direction transverse to the normal to the upper or lower face of the plate, makes it possible to redistribute the fluid flow from the straightening stage to the stage. 21 orientation by breaking the boundary layers of the fluid flow. It is also possible to provide a day between the recovery and orientation stages, height corresponding preferably to 10% maximum of the cumulative height of the recovery stages and orientation. Such a day, that is to say a space in a direction substantially parallel to the normal to the upper or lower face of the plate, improves the redistribution of the flux while substantially maintaining the rectified orientation of the flow output of the righting stage.
- said diffusion screen 22 is formed by a woven fabric, preferably of plastic, such as polyethylene, whose meshes, for example of square shape and 300 micrometers side, form said openings of the screen 22 of diffusion.
- said diffusion screen is formed by a nonwoven web, preferably also plastic, such as polyethylene, pierced to form the openings of said screen.
- plastic can also be polyester or polyamide.
- polyethylene has the advantage of limiting the risk of scratches on objects handled when they are in contact with the screen.
- Said diffusion screen may also be formed by a pierced film, for example plastic, preferably polyethylene, whose holes form said openings of said diffusion screen.
- Said diffusion screen may also be formed by a grid or a porous material.
- said device comprises a box 8 having an air inlet 81 and an air outlet 82 opening on the lower face 200 of the diffusion plate 2.
- a fan 6 is arranged inside the box 8 to circulate a stream fluid from the inlet 81 to the outlet 82 of said box 8 corresponding to the inlet of the diffusion plate defined by its underside 200.
- Said device is equipped with means for regulating the speed of the fluid flow.
- Said speed control means comprise a speed sensor, located between the fan 6 and the air outlet 82 of the box 8, and a control unit 61 of the fan 6 as a function of the fluid flow velocity acquired by the sensor 5 to maintain the speed of the fluid flow at the outlet of the diffusion plate 2 substantially equal to a set value despite possible partial closure of the upper surface by the manipulated object and / or by the operator.
- said sensor 5 is positioned at a point where the total pressure of the fluid, defined as the sum of the static pressure and the dynamic pressure, is close to that of the fluid just at the outlet of the diffusion plate 2.
- Said speed sensor 5 comprises a housing 52 which extends through a wall of the box 8 and in which are provided a fluid inlet 51 on the inside side of the box and an outlet 53 of fluid on the outside side. of the box.
- Said housing 52 houses a probe 50 for acquiring the speed of the flow of fluid flowing between the inlet and the outlet of the housing 52.
- the inlet 51 of the sensor is formed by an opening in the housing 52. covered with a screen of the same type, that is to say which has the same aerodynamic characteristics, in particular in terms of pressure drop generated, as that of the screen 22 of diffusion so as to create a loss of head at the level of the input of the sensor 5 slightly lower than that of the plate 2.
- the pressure drop associated with the plate 2 results not only from the pressure drop associated with the diffusion screen 22 but also from the slight loss of pressure induced. by the other stages 20, 21 of the plate 2.
- Such a design of the sensor 5 makes it possible to reliably measure a speed of the fluid flow corresponding to a speed substantially equal to or slightly greater than that coming from the plate 2.
- Said device comprises a filter, called prefilter 30, located upstream of the fan 6, preferably at the inlet of said box.
- Said device also comprises a filter 31 located downstream of the fan 6, preferably between the fan 6 and the speed sensor 5.
- the filters are adapted to obtain an ISO5 class cleanliness defined in the ISO 14644-1 standard.
- said box 8 is located under the plane passing through the lower face 200 of the plate 2 of diffusion.
- the rear side, opposite to the front side of the plate, delimited by said inner portion 211 of the plate is extended by the work plane 1.
- the upper face 12 of the work plane is flush with the upper face 202 of the diffusion plate.
- a portion of said box is located under the plate 2 of diffusion, the other part being located under the plane 1 of work.
- the disposition of said box to a height less than that of the diffusion plate makes it possible to limit the visual bulk of the operator.
- said device can also be equipped with means of regulation of the temperature of the fluid flow.
- Such a design of the protection device allows the manipulation of objects supporting a breath of air at 0.6m / s, without detachment of the blower surface, in an atmosphere guaranteeing an ISO5 cleanliness level.
- the manipulated objects can thus be small.
- the object manipulation on or above the diffusion plate 2 can be carried out without detachment of the latter from the upper face 202, also called the blowing surface, of the plate, under conditions that are comfortable for the operator, by ensuring surface continuity 202 between the blowing surface of the plate 2 and that of the non-blowing plane 1 of the work plane, so as to obtain an assembly formed of the working plane 1 and the plate 2 of diffusion which is free of projecting portion.
- the device can be easily integrated in an existing workstation with a limited space of the entire device, replacing the portion of the work plane corresponding to the operating field, by the diffusion plate as described above.
- Such a design of the device according to the invention makes it possible to stabilize the speed of the fluid flow at the outlet of the plate.
- the regulation of the speed of the fluid flow makes it possible to obtain a difference of about 15%, or even less, with respect to the set speed, for a closure of the blowing surface of up to 50%, handling the objects on and / or above said blowing surface.
- the target speed can be for example from 0.45m / s to 20 millimeters downstream of the blowing surface.
- the tray described above can also be used as a diffusing ceiling allowing the operator to manipulate objects under said tray used ceiling.
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- General Engineering & Computer Science (AREA)
- Air-Flow Control Members (AREA)
Description
La présente invention concerne de manière générale la protection d'une zone d'opération. L'invention concerne plus particulièrement un dispositif de protection d'une zone d'opération, notamment pour la manipulation de produits, et un procédé de manipulation correspondant. Un dispositif conforme au préambule de la revendication 1 est connu, par exemple, du document
Dans de nombreux domaines industriels, tels que l'agro-alimentaire, la pharmacie, la biologie ou l'électronique, il est nécessaire de protéger la zone de manipulation des produits vis-à-vis des pollutions extérieures.In many industrial fields, such as agribusiness, pharmaceuticals, biology or electronics, it is necessary to protect the product handling area from external pollution.
Il est connu de protéger la zone de manipulation en la balayant par un flux d'air. Usuellement un tel flux d'air est généré par des moyens de soufflage et/ou d'aspiration placés à proximité de ladite zone de manipulation.It is known to protect the handling zone by sweeping it by a flow of air. Usually, such an air flow is generated by blowing and / or suction means placed near said handling zone.
Ces moyens de soufflage/aspiration sont situés à proximité de la zone de manipulation pour maîtriser le flux d'air en vue d'obtenir la stabilité du flux d'air avec une vitesse faible et une température adaptée au confort des opérateurs.These blowing / suction means are located near the handling zone to control the flow of air in order to obtain the stability of the air flow with a low speed and a temperature adapted to the comfort of the operators.
Cependant, la présence de ces moyens de soufflage/aspiration à proximité des opérateurs peut constituer une gêne pour l'utilisateur par l'encombrement physique et/ou visuel qu'ils imposent. L'opérateur peut aussi être incommodé par le flux d'air lorsque son visage est exposé.However, the presence of these blowing / suction means close to the operators can be an inconvenience for the user by the physical and / or visual clutter they impose. The operator may also be inconvenienced by the airflow when his face is exposed.
Le document
Le but de l'invention est de proposer un dispositif de protection d'une zone de Le document
A cet effet, l'invention a pour objet un dispositif de protection d'une zone d'opération, notamment pour la manipulation de produits, conforme à la revendication 1.For this purpose, the subject of the invention is a device for protecting an operating zone, in particular for handling products, according to
L'étage de redressement permet de redresser le fluide qui arrive en entrée du plateau, en particulier lorsque celui-ci arrive sensiblement parallèlement au plateau, c'est-à-dire sensiblement parallèlement à la face de dessous du plateau.The rectifying stage makes it possible to straighten the fluid which arrives at the input of the plate, in particular when it arrives substantially parallel to the plate, that is to say substantially parallel to the underside of the plate.
L'étage d'orientation situé au-dessus, c'est-à-dire en aval de l'étage de redressement, permet d'orienter le flux redressé dans la direction souhaitée en limitant les pertes de charge et les défauts d'homogénéité de la vitesse du flux au niveau de la surface de diffusion du plateau par rapport à une configuration dans laquelle le flux ne serait pas précédemment redressé.The orientation stage located above, that is to say downstream of the rectifying stage, makes it possible to orient the rectified flow in the desired direction by limiting the losses of charge and the defects of homogeneity. the velocity of the flux at the plateau diffusion surface relative to a configuration in which the flow would not previously be rectified.
L'écran de diffusion permet, grâce à ses ouvertures réduites, de former une surface de travail sensiblement plane, sur laquelle des objets peuvent être posés avec un risque réduit de tomber ou de se coincer dans les ouvertures du plateau.The diffusion screen allows, thanks to its reduced openings, to form a substantially flat work surface, on which objects can be placed with a reduced risk of falling or jamming in the openings of the tray.
Une telle combinaison permet d'orienter le flux suivant une direction oblique par rapport à la normale au plateau pour permettre à un opérateur de se positionner du côté opposé au flux afin de limiter l'exposition de son visage au flux, tout en limitant les pertes de charge du flux et en offrant une surface de manipulation sensiblement plane, avec un risque réduit de chute d'objet dans les ouvertures du plateau.Such a combination makes it possible to direct the flow in an oblique direction relative to the normal to the plate to allow an operator to position himself on the opposite side of the flow in order to limit the exposure of his face to the flow, while limiting the losses. charging the flow and providing a substantially flat handling surface, with a reduced risk of falling object in the openings of the tray.
La partie inclinée de la zone de séparation prolonge la partie parallèle vers le côté d'extrémité libre, ou tranche externe, du plateau. Une telle inclinaison de la partie de la zone de séparation entre l'étage de redressement et l'étage d'orientation située du côté de la tranche du plateau, permet d'obtenir, en particulier du côté où se situe l'opérateur, une diffusion de fluide avec des caractéristique aérodynamiques stables, tout en maintenant une orientation du flux dans le sens d'un écartement par rapport à l'opérateur.The inclined portion of the separation zone extends the parallel portion to the free end or outer edge side of the tray. Such inclination of the portion of the separation zone between the rectifying stage and the orientation stage located on the side of the slice of the plate makes it possible to obtain, in particular on the side where the operator is located, a fluid diffusion with stable aerodynamic characteristics, while maintaining an orientation of the flow in the direction of a gap with respect to the operator.
Ledit point haut de la partie inclinée est plus proche de la face supérieure que de la face inférieure et est situé sur ou proche du côté d'extrémité libre, encore appelé tranche externe, du plateau au niveau de laquelle l'opérateur se positionne.Said high point of the inclined portion is closer to the upper face than the lower face and is located on or near the free end side, also called the outer edge, of the plate at which the operator is positioned.
La zone de séparation entre les deux étages de redressement et d'orientation comprend ainsi une surface non plane présentant un point haut proche du côté, encore appelé tranche externe, du plateau où l'opérateur se tient par rapport au point bas plus proche du centre du plateau. Ainsi la surface supérieure du plateau est alimentée en air sur toute sa surface, même du côté du plateau où se situe l'opérateur. En outre, grâce à une telle inclinaison de la partie de la zone de séparation située à proximité de la tranche externe, avec un point haut situé du côté de ladite tranche externe, l'effet visqueux des lames d'air sortant des ouvertures inclinées issues de la zone la plus épaisse de l'étage de d'orientation définie par la partie parallèle de la zone de séparation, induit l'entraînement des lames d'air qui sortent le plus près de l'opérateur, issues de la zone la moins épaisse de l'étage d'orientation définie par la partie inclinée, en confortant leur l'inclinaison souhaitée. Un tel agencement de la partie inclinée permet ainsi de conserver le côté du plateau où se tient l'opérateur, perpendiculaire aux faces supérieure et inférieure du plateau, tout en assurant une diffusion d'air sur l'ensemble de la surface supérieure du plateau même à proximité de l'opérateur et avec un effet d'inclinaison fiable au niveau de la tranche externe du fait de l'entrainement dudit flux diffusé au niveau du bord d'extrémité, par le flux diffusé au niveau du centre de la surface supérieure du plateau.The separation zone between the two rectifying and orienting stages thus comprises a non-planar surface having a high point close to the side, also called the outer slice, of the plate where the operator stands with respect to the lowest point closer to the center. of the plateau. Thus the upper surface of the plate is supplied with air over its entire surface, even on the side of the plate where the operator is located. In addition, thanks to such inclination of the part of the separation zone located near the outer edge, with a high point located on the side of said outer edge, the viscous effect of the air knives coming out of the inclined apertures of the thickest zone of the orientation stage defined by the parallel part of the separation zone, induces the entrainment of the blades of air which come closest to the operator, coming from the zone less thick of the orientation stage defined by the inclined part, by consolidating their desired inclination. Such an arrangement of the inclined portion thus preserves the side of the plate where the operator stands, perpendicular to the upper and lower faces of the plate, while ensuring air diffusion over the entire upper surface of the plate itself close to the operator and with a reliable tilt effect at the outer edge due to the entrainment of said diffused flux at the end edge, by the flux diffused at the center of the upper surface of the tray.
Selon un mode de réalisation particulier la partie inclinée est rectiligne.According to a particular embodiment, the inclined portion is rectilinear.
Selon un autre mode de réalisation particulier, la partie inclinée est courbe, et le centre de courbure de la partie inclinée est orienté vers la face supérieure dudit plateau. On peut en particulier prévoir que la partie inclinée prolonge la partie parallèle de manière tangentielle.According to another particular embodiment, the inclined portion is curved, and the center of curvature of the inclined portion is oriented towards the upper face said plateau. In particular, it is possible for the inclined portion to extend the parallel portion tangentially.
Selon une caractéristique avantageuse de l'invention, l'épaisseur de l'écran de diffusion est plus faible que celle de l'étage d'orientation ou de l'étage de redressement.According to an advantageous characteristic of the invention, the thickness of the diffusion screen is smaller than that of the orientation stage or the recovery stage.
Selon une caractéristique avantageuse de l'invention, ledit dispositif comprend un panneau, appelé plan de travail, de préférence d'épaisseur sensiblement égale à celle du plateau de diffusion, qui prolonge le plateau de diffusion du côté d'une tranche, dite tranche interne, du plateau de diffusion, opposée à la tranche, dite tranche externe, au niveau de laquelle un opérateur est apte à se positionner en vue de manipuler des produits au dessus du plateau de diffusion, et ladite deuxième direction correspondant à l'orientation des ouvertures de l'étage d'orientation est choisie de manière à diriger le flux de fluide en face supérieure du plateau en l'éloignant de la tranche externe du plateau de diffusion.According to an advantageous characteristic of the invention, said device comprises a panel, called a working plane, preferably of thickness substantially equal to that of the diffusion plate, which extends the diffusion plate on the side of a slice, called inner slice of the scattering plate, opposed to the slice, said outer slice, at which an operator is able to position himself to manipulate products above the diffusion plate, and said second direction corresponding to the orientation of the openings of the orientation stage is chosen so as to direct the flow of fluid in the upper face of the plate away from the outer edge of the diffusion plate.
Selon une caractéristique avantageuse de l'invention, ledit point haut est situé sur le, ou au voisinage du, bord supérieur externe du plateau de diffusion, défini par la jonction de la face supérieure du plateau et de ladite tranche externe.According to an advantageous characteristic of the invention, said high point is located on the or near the upper outer edge of the diffusion plate, defined by the junction of the upper face of the plate and said outer edge.
Selon une caractéristique avantageuse de l'invention, l'étage d'orientation et/ou l'étage de redressement comprend une structure alvéolaire, de préférence en nid d'abeille, lesdites alvéoles formant les ouvertures dudit étage.According to an advantageous characteristic of the invention, the orientation stage and / or the recovery stage comprises a honeycomb structure, preferably a honeycomb structure, said cells forming the openings of said stage.
Selon une caractéristique avantageuse de l'invention, les alvéoles de l'étage d'orientation sont décalées par rapport aux alvéoles de l'étage de redressement avec lesquelles elles communiquent.According to an advantageous characteristic of the invention, the cells of the orientation stage are offset with respect to the cells of the recovery stage with which they communicate.
Une structure en nid d'abeille de l'étage d'orientation et/ou de l'étage de redressement permet de contribuer à la laminarisation du flux de fluide et de guider le flux en limitant les pertes de charge, tout en formant un support rigide pour l'écran de diffusion. En variante, la structure en nid d'abeille pourrait être remplacée par une autre structure à alvéoles, ou d'autres structures à ouvertures, tout en présentant des directrices de même nature pour guider le flux, telles que des lamelles courbées, ou des tubes cintrés. Avantageusement, la taille caractéristique de la section de passage de chaque alvéole, par exemple le diamètre du cercle inscrit, est au moins trois fois inférieure à sa hauteur.A honeycomb structure of the orientation stage and / or the floor of straightening makes it possible to contribute to the laminarization of the fluid flow and to guide the flow by limiting the pressure drops, while forming a rigid support for the diffusion screen. Alternatively, the honeycomb structure could be replaced by another honeycomb structure, or other apertured structures, while having similar guides to guide the flow, such as curved sipes, or tubes bent. Advantageously, the characteristic size of the passage section of each cell, for example the diameter of the inscribed circle, is at least three times smaller than its height.
Selon une caractéristique avantageuse de l'invention, ledit écran de diffusion est formé par une toile tissée, de préférence en plastique, tel que du polyéthylène.According to an advantageous characteristic of the invention, said diffusion screen is formed by a woven fabric, preferably made of plastic, such as polyethylene.
Selon une caractéristique avantageuse de l'invention, ledit dispositif comprend un caisson présentant une entrée d'air et une sortie d'air débouchant sur la face inférieure du plateau de diffusion, et un ventilateur agencé, de préférence à l'intérieur du caisson, pour faire circuler un flux de fluide depuis l'entrée vers la sortie dudit caisson.According to an advantageous characteristic of the invention, said device comprises a box having an air inlet and an air outlet opening on the lower face of the diffusion plate, and a fan arranged, preferably inside the box, for circulating a flow of fluid from the inlet to the outlet of said housing.
Selon une caractéristique avantageuse de l'invention, ledit dispositif comprend des moyens de régulation de la vitesse du flux de fluide, lesdits moyens de régulation de vitesse comprenant un capteur de vitesse et une unité de pilotage du ventilateur en fonction de la vitesse de flux de fluide acquise par le capteur pour maintenir la vitesse du flux de fluide en sortie du plateau de diffusion sensiblement égale à une valeur de consigne.According to an advantageous characteristic of the invention, said device comprises means for regulating the speed of the fluid flow, said speed regulating means comprising a speed sensor and a fan control unit according to the speed of flow of the fluid. fluid acquired by the sensor to maintain the speed of the fluid flow at the output of the diffusion plate substantially equal to a set value.
Selon une caractéristique avantageuse de l'invention, ledit capteur de vitesse comprend un boîtier qui s'étend à travers une paroi du caisson et dans lequel sont ménagées une entrée de fluide du côté de l'intérieur du caisson et une sortie de fluide du côté de l'extérieur du caisson, ledit boîtier logeant une sonde d'acquisition de la vitesse du flux de fluide circulant entre l'entrée et la sortie du boîtier, et ledit capteur est conçu pour générer une perte de charge, vis-à-vis du fluide qui le traverse, sensiblement égale à celle générée par l'écran de diffusion.According to an advantageous characteristic of the invention, said speed sensor comprises a housing which extends through a wall of the box and in which are formed a fluid inlet on the side of the interior of the box and a fluid outlet on the side. from the outside of the box, said housing housing a probe for acquiring the speed of the flow of fluid flowing between the inlet and the output of the housing, and said sensor is designed to generate a pressure drop, vis-à-vis the fluid passing through it, substantially equal to that generated by the diffusion screen.
Selon une caractéristique avantageuse de l'invention, ledit capteur de vitesse est situé entre le ventilateur et la sortie d'air du caisson.According to an advantageous characteristic of the invention, said speed sensor is located between the fan and the air outlet of the box.
Selon une caractéristique avantageuse de l'invention, ledit dispositif comprend un filtre, appelé préfiltre, situé en amont du ventilateur, de préférence à l'entrée dudit caisson, et/ou un filtre, situé en aval du ventilateur, de préférence entre le ventilateur et le capteur de vitesse.According to an advantageous characteristic of the invention, said device comprises a filter, called prefilter, located upstream of the fan, preferably at the inlet of said box, and / or a filter, located downstream of the fan, preferably between the fan and the speed sensor.
Selon une caractéristique avantageuse de l'invention, ledit caisson est situé sous le plan passant par la face inférieure du plateau de diffusion.According to an advantageous characteristic of the invention, said box is located under the plane passing through the lower face of the diffusion plate.
L'invention concerne également un procédé de manipulation de produits au dessus d'un plateau, appelé plateau de diffusion, caractérisé en ce que ledit plateau de diffusion fait partie d'un dispositif de protection d'une zone d'opération tel que décrit ci-dessus et pour lequel le flux de fluide diffusé en face supérieure est orienté suivant une direction oblique par rapport à la normale au plateau, et en ce qu'un opérateur se positionne du côté du plateau qui est opposé au sens de direction dudit flux de fluide diffusé en face supérieure.The invention also relates to a method of handling products above a plate, called a diffusion plate, characterized in that said diffusion plate is part of a protection device for an operation zone as described herein. above and for which the fluid flow diffused on the upper face is oriented in a direction oblique with respect to the normal to the plate, and in that an operator is positioned on the side of the plate which is opposite to the direction direction of said flow of diffused fluid in the upper face.
L'invention sera bien comprise à la lecture de la description suivante d'exemples de réalisation, en référence aux dessins annexés dans lesquels :
- la
figure 1 est une vue en coupe du dispositif selon l'invention montrant le cheminement du flux d'air d'amont en aval du plateau diffuseur; - la
figure 2 est une vue schématique du capteur de vitesse du dispositif selon l'invention ; - la
figure 3 est une vue schématique en coupe du dispositif selon l'invention montrant les trois étages du plateau de diffusion selon un premier mode de réalisation ; - la
figure 4 est une vue schématique en coupe du dispositif selon l'invention montrant les trois étages du plateau de diffusion selon un deuxième mode de réalisation.
- the
figure 1 is a sectional view of the device according to the invention showing the flow of the upstream air flow downstream of the diffuser plate; - the
figure 2 is a schematic view of the speed sensor of the device according to the invention; - the
figure 3 is a schematic sectional view of the device according to the invention showing the three stages of the diffusion plate according to a first embodiment of production ; - the
figure 4 is a schematic sectional view of the device according to the invention showing the three stages of the diffusion plate according to a second embodiment.
En référence aux figures et comme rappelé ci-dessus, l'invention concerne un dispositif de protection d'une zone d'opération 100, notamment pour la manipulation de produits de différents types.With reference to the figures and as recalled above, the invention relates to a device for protecting an
Ledit dispositif comprend un plateau 2, appelé plateau de diffusion, présentant deux faces opposées, l'une dite face supérieure 202, orientée vers la zone d'opération 100, et l'autre, dite face inférieure 200.Said device comprises a
Ledit plateau de diffusion 2 comprend un premier étage, appelé étage de redressement 20, un deuxième étage, appelé étage d'orientation 21 et un troisième étage, appelé écran de diffusion 22. Lesdits étages présentent chacun des ouvertures de passage d'un flux de fluide 7, par exemple de l'air. Ledit plateau est destiné à être utilisé dans un local. Ledit plateau est situé à écartement du sol pour que l'opérateur puisse se tenir debout en manipulant des produits au dessus dudit plateau. Avantageusement, la face supérieure 202 dudit plateau est située à une hauteur adaptée par rapport au sol, par exemple comprise entre 0.6 et 1.7 mètres, pour permettre à un opérateur, qui se tient debout, de manipuler les produits de manière confortable. Cette hauteur est ajustée si la position de travail diffère de la position debout, de sorte que la face supérieure du plateau reste accessible à l'opérateur.Said
Comme illustré à la
Lesdites ouvertures 205 de l'étage de redressement 20 sont configurées pour orienter le flux de fluide, entrant dans le plateau de diffusion 2 par sa face inférieure 200, selon une première direction, par exemple verticale. Dans l'exemple illustré aux figures, l'axe de chacune des ouvertures de l'étage de redressement 20 est ainsi perpendiculaire à la face inférieure 200 du plateau.Said
Les ouvertures 215 de l'étage d'orientation 21 communiquent avec les ouvertures de l'écran de diffusion 22. Préférentiellement, l'épaisseur de l'écran de diffusion 22 est très faible par comparaison à celle des autres étages de sorte que les ouvertures de cet écran ne sont pas représentées aux figures. Lesdites ouvertures de l'étage d'orientation 21 sont configurées pour orienter le flux de fluide 7, sortant des ouvertures de l'étage de redressement 20, selon une deuxième direction oblique par rapport à ladite première direction.The
Ainsi, pour diriger le flux diffusé par le plateau de diffusion à écartement de l'opérateur afin de ne pas le gêner, ledit axe de chaque ouverture de l'étage 21 d'orientation est incliné par rapport à celui de chaque ouverture de l'étage 20 de redressement, de sorte que les passages d'ouverture définis par les ouvertures entre la face inférieure 200 et la face supérieure 202 du plateau 2 présentent chacun une directrice coudée.Thus, to direct the flux diffused by the spreading plate spaced from the operator so as not to interfere, said axis of each opening of the
Chaque ouverture de l'écran de diffusion 22 débouche sur la face supérieure 202 du plateau 2 et présente une section de passage dont la surface est plus petite que celle de chacune desdites ouvertures 215 de l'étage d'orientation 21 ainsi que celle des ouvertures 205 de l'étage de redressement 20. On entend par section de passage, la section transversale à l'axe de l'ouverture. L'axe de l'ouverture correspond à la direction principale du flux circulant à travers ladite ouverture.Each opening of the
Ledit plateau 2 présente ainsi une pluralité de passages traversants permettant à un flux de fluide de passer d'une face 200 à l'autre 202 dudit plateau 2, c'est-à-dire permettant la diffusion d'un fluide du côté de la face supérieure du plateau orientée vers la zone d'opération 100, tout en redressant le flux entrant du côté de la face inférieure, puis en l'inclinant pour le diffuser à travers l'écran 22 de diffusion au niveau de la zone d'opération100. Le flux diffusé sort de la face supérieure avec l'inclinaison définie par les ouvertures de l'étage d'orientation. Le flux diffusé est ainsi incliné par rapport à la face supérieure 202 du plateau. En particulier l'inclinaison est choisie de sorte que le flux sortant du plateau est diffusé dans le sens d'un écartement par rapport au bord d'extrémité libre du plateau au niveau duquel l'opérateur est destiné à se positionner pour manipuler les produits. Une telle conception du plateau permet ainsi de limiter le risque de diffusion du flux sur la tête de l'opérateur de sorte la zone d'opération au dessus du plateau est protégée par le flux diffusé vis-à-vis des pollutions extérieures tout en maintenant un confort de travail pour l'opérateur qui en restant du côté dudit bord d'extrémité libre du plateau, peut conserver son tronc et sa tête à l'abri du flux d'air diffusé.Said
La zone de séparation 201 de l'étage de redressement 20 et de l'étage d'orientation 21 présente une partie 201 a sensiblement parallèle à la face supérieure 202 du plateau 2 de diffusion, située au niveau de la partie centrale du plateau, et une partie inclinée 201b depuis un point bas PB dans le prolongement de la partie parallèle 201 a jusqu'à un point haut PH écarté du centre du plateau par rapport au point bas et situé au niveau du bord d'extrémité libre. Comme rappelé ci-dessus, le plateau de diffusion présente un côté d'extrémité libre, encore appelé tranche externe, au niveau duquel l'opérateur se positionne pour pouvoir manipuler des produits sur et/ou au-dessus dudit plateau 2. En particulier, ledit point haut PH est situé sur le bord supérieur du plateau 2 qui forme le bord de jonction entre la face supérieure 202 du plateau et la tranche externe 212.The
Ladite partie inclinée depuis un point bas PB jusqu'à un point haut PH écarté du centre du plateau par rapport au point bas peut être une partie droite formant une pente rectiligne comme illustré à la
Selon un autre mode de réalisation illustré à la
Selon les modes de réalisation des
La partie inclinée de la zone de séparation prolonge la partie parallèle vers la tranche externe du plateau. Une telle inclinaison de la partie de la zone de séparation 201 entre l'étage 20 de redressement et l'étage 21 d'orientation située du côté de la tranche 212 du plateau, permet d'obtenir une diffusion de fluide en sortie du plateau 2 même à proximité de l'opérateur tout en maintenant une orientation du flux dans le sens d'un écartement par rapport à l'opérateur.The inclined portion of the separation zone extends the parallel portion to the outer edge of the tray. Such inclination of the portion of the
Comme illustré à la
Ladite deuxième direction qui correspond à l'orientation des ouvertures 215 de l'étage d'orientation 21 est choisie de manière à diriger le flux de fluide 7 en face supérieure 202 du plateau 2 en l'éloignant de la tranche externe 212 du plateau de diffusion 2, afin d'éviter que l'opérateur ne soit gêné par ce flux. Comme rappelé ci-dessus, cette orientation est réalisée par inclinaison du flux à travers le plateau 2 de diffusion par rapport à sa direction d'entrée dans le plateau 2 que lui imprime l'étage 20 de redressement.Said second direction corresponding to the orientation of the
Comme illustré à la
Comme on peut l'observer à la
Avantageusement, l'étage d'orientation 21 et l'étage de redressement 20 présentent chacun une structure alvéolaire, de préférence en nid d'abeille. Lesdites alvéoles forment alors les ouvertures dudit étage. L'axe des alvéoles de l'étage 21 d'orientation est ainsi incliné par rapport à celui des alvéoles de l'étage 20 de redressement.Advantageously, the
On peut prévoir que les alvéoles de l'étage d'orientation 21 soient décalées par rapport aux alvéoles de l'étage 20 de redressement avec lesquelles elles communiquent de manière à diriger le flux de fluide du côté de la tranche interne 211 du plateau par opposition à la tranche externe 212. Avantageusement, la structure de chaque nid d'abeille est telle que les alvéoles sont accolées selon un schéma polygonal régulier. Par exemple, des cellules à base circulaire sont accolées selon un schéma hexagonal. La superposition des deux nids d'abeille peut être telle que les cellules soient décalées à la jonction, et que le vide, c'est-à-dire le passage d'air, de l'alvéole du nid d'abeille rencontre le plein, c'est-à-dire la cloison, de l'autre nid d'abeille.It is possible for the cells of the
Ainsi dans l'exemple illustré à la
Le décalage entre les ouvertures des étages de redressement et d'orientation, suivant une direction transversale par rapport à la normale à la face supérieure ou inférieure du plateau, permet de redistribuer le flux de fluide de l'étage 20 de redressement à l'étage 21 d'orientation en brisant les couches limites du flux de fluide. On peut aussi prévoir de ménager un jour entre les étages de redressement et d'orientation, de hauteur correspondant de préférence à 10% maximum de la hauteur cumulée des étages de redressement et d'orientation. Un tel jour, c'est-à-dire un espace suivant une direction sensiblement parallèle à la normale à la face supérieure ou inférieure du plateau, améliore la redistribution du flux tout en conservant sensiblement l'orientation redressée du flux en sortie de l'étage de redressement.The offset between the openings of the straightening and orientation stages, in a direction transverse to the normal to the upper or lower face of the plate, makes it possible to redistribute the fluid flow from the straightening stage to the stage. 21 orientation by breaking the boundary layers of the fluid flow. It is also possible to provide a day between the recovery and orientation stages, height corresponding preferably to 10% maximum of the cumulative height of the recovery stages and orientation. Such a day, that is to say a space in a direction substantially parallel to the normal to the upper or lower face of the plate, improves the redistribution of the flux while substantially maintaining the rectified orientation of the flow output of the righting stage.
Préférentiellement, ledit écran 22 de diffusion est formé par une toile tissée, de préférence en plastique, tel que du polyéthylène, dont les mailles, par exemple de forme carrée et de côté 300 micromètres, forment lesdites ouvertures de l'écran 22 de diffusion.Preferably, said
En variante, on peut prévoir que ledit écran de diffusion soit formé par une toile non tissée, de préférence aussi en plastique, tel que du polyéthylène, percée pour former les ouvertures dudit écran. Ledit plastique peut aussi être du polyester ou polyamide. Le polyéthylène présente cependant l'avantage de limiter les risques de rayures au niveau des objets manipulés lorsque ceux-ci sont en contact avec l'écran. Ledit écran de diffusion peut aussi être formé par un film percé, par exemple en plastique, de préférence en polyéthylène, dont les perçages forment lesdites ouvertures dudit écran de diffusion. Ledit écran de diffusion peut aussi être formé par une grille ou un matériau poreux.Alternatively, it can be provided that said diffusion screen is formed by a nonwoven web, preferably also plastic, such as polyethylene, pierced to form the openings of said screen. Said plastic can also be polyester or polyamide. However, polyethylene has the advantage of limiting the risk of scratches on objects handled when they are in contact with the screen. Said diffusion screen may also be formed by a pierced film, for example plastic, preferably polyethylene, whose holes form said openings of said diffusion screen. Said diffusion screen may also be formed by a grid or a porous material.
Comme illustré à la
Ledit dispositif est équipé de moyens de régulation de la vitesse du flux de fluide. Lesdits moyens de régulation de vitesse comprennent un capteur 5 de vitesse, situé entre le ventilateur 6 et la sortie d'air 82 du caisson 8, et une unité de pilotage 61 du ventilateur 6 en fonction de la vitesse de flux de fluide acquise par le capteur 5 pour maintenir la vitesse du flux de fluide en sortie du plateau 2 de diffusion sensiblement égale à une valeur de consigne malgré une éventuelle obturation partielle de la surface supérieure par l'objet manipulé et/ou par l'opérateur. En outre, ledit capteur 5 est positionné en un point où la pression totale du fluide, définie comme la somme de la pression statique et de la pression dynamique, est proche de celle du fluide juste en sortie du plateau 2 de diffusion.Said device is equipped with means for regulating the speed of the fluid flow. Said speed control means comprise a speed sensor, located between the
Ledit capteur 5 de vitesse comprend un boîtier 52 qui s'étend à travers une paroi du caisson 8 et dans lequel sont ménagées une entrée 51 de fluide du côté de l'intérieur du caisson et une sortie 53 de fluide du côté de l'extérieur du caisson. Ledit boîtier 52 loge une sonde 50 d'acquisition de la vitesse du flux de fluide circulant entre l'entrée et la sortie du boîtier 52. Avantageusement, l'entrée 51 du capteur est formée par une ouverture dans le boîtier 52 recouverte d'un écran de même type, c'est-à-dire qui présente les mêmes caractéristiques aérodynamiques, en particulier en terme de perte de charge générée, que celui de l'écran 22 de diffusion de manière à créer une perte de charge au niveau de l'entrée du capteur 5 légèrement inférieure à celle du plateau 2. La perte de charge liée au plateau 2 résulte non seulement de la perte de charge associée à l'écran 22 de diffusion mais aussi de la légère perte de charge induite par les autres étages 20, 21 du plateau 2. Une telle conception du capteur 5 permet de mesurer de manière fiable une vitesse du flux de fluide correspondant à une vitesse sensiblement égale, voire légèrement supérieure, à celle sortant du plateau 2.
Ledit dispositif comprend un filtre, appelé préfiltre 30, situé en amont du ventilateur 6, de préférence à l'entrée dudit caisson. Ledit dispositif comprend aussi un filtre 31, situé en aval du ventilateur 6, de préférence entre le ventilateur 6 et le capteur 5 de vitesse. Avantageusement, les filtres sont adaptés pour obtenir une propreté de classe ISO5 définie dans la norme ISO 14644-1.Said device comprises a filter, called
Avantageusement, ledit caisson 8 est situé sous le plan passant par la face inférieure 200 du plateau 2 de diffusion.Advantageously, said
Le côté arrière, opposé au côté avant, du plateau, délimité par ladite tranche 211 interne du plateau est prolongé par le plan de travail 1. Préférentiellement, la face supérieure 12 du plan de travail affleure la face supérieure 202 du plateau de diffusion.The rear side, opposite to the front side of the plate, delimited by said
Dans l'exemple illustré aux figures, une partie dudit caisson est située sous le plateau 2 de diffusion, l'autre partie étant située sous le plan 1 de travail. La disposition dudit caisson à une hauteur inférieure à celle du plateau de diffusion permet de limiter l'encombrement visuel de l'opérateur.In the example illustrated in the figures, a portion of said box is located under the
De manière optionnelle, ledit dispositif peut aussi être équipé de moyens de régulation de la température du flux de fluide.Optionally, said device can also be equipped with means of regulation of the temperature of the fluid flow.
Une telle conception du dispositif de protection permet la manipulation d'objets supportant un souffle d'air à 0.6m/s, sans décollement de la surface soufflante, sous une atmosphère garantissant un niveau de propreté ISO5.Such a design of the protection device allows the manipulation of objects supporting a breath of air at 0.6m / s, without detachment of the blower surface, in an atmosphere guaranteeing an ISO5 cleanliness level.
Les objets manipulés peuvent ainsi être de petite taille. La manipulation d'objet sur ou au-dessus du plateau 2 de diffusion peut s'effectuer sans décollement de ces derniers de la face 202 supérieure, encore appelée surface soufflante, du plateau, dans des conditions confortables pour l'opérateur, en assurant une continuité de surface 202 entre la surface soufflante du plateau 2 et celle 12 non soufflante du plan 1 de travail, de façon à obtenir un ensemble formé du plan 1 de travail et du plateau 2 de diffusion qui soit exempt de partie saillante.The manipulated objects can thus be small. The object manipulation on or above the
Le dispositif peut être intégré aisément dans un poste de travail existant grâce à un encombrement limité de l'ensemble du dispositif, en remplaçant la portion du plan de travail correspondant au champ opératoire, par le plateau de diffusion tel que décrit ci-dessus.The device can be easily integrated in an existing workstation with a limited space of the entire device, replacing the portion of the work plane corresponding to the operating field, by the diffusion plate as described above.
Une telle conception du dispositif selon l'invention, et en particulier dans le cas d'utilisation de moyens de régulation tels que décrits ci-dessus, permet de stabiliser la vitesse du flux de fluide en sortie du plateau. La régulation de la vitesse du flux de fluide permet d'obtenir un écart de l'ordre de 15%, voire inférieur, par rapport à la vitesse de consigne, pour une obturation de la surface soufflante pouvant aller jusqu'à 50% du fait de la manipulation des objets sur et/ou au-dessus de ladite surface soufflante. La vitesse de consigne peut être par exemple de 0.45m/s à 20 millimètres en aval de la surface soufflante.Such a design of the device according to the invention, and in particular in the case of using regulating means as described above, makes it possible to stabilize the speed of the fluid flow at the outlet of the plate. The regulation of the speed of the fluid flow makes it possible to obtain a difference of about 15%, or even less, with respect to the set speed, for a closure of the blowing surface of up to 50%, handling the objects on and / or above said blowing surface. The target speed can be for example from 0.45m / s to 20 millimeters downstream of the blowing surface.
Le plateau décrit ci-dessus peut aussi être utilisé en tant que plafond diffusant permettant à l'opérateur de manipuler des objets sous ledit plateau utilisé en plafond.The tray described above can also be used as a diffusing ceiling allowing the operator to manipulate objects under said tray used ceiling.
La présente invention n'est nullement limitée aux modes de réalisation décrits et représentés, mais l'homme du métier saura y apporter toute variante dans la limite des revendications.The present invention is not limited to the embodiments described and shown, but the skilled person will be able to make any variant within the scope of the claims.
Claims (16)
- A protection device for an operating zone (100), in particular for handling products, said device comprising a plate (2), called diffusion plate, having two opposite faces, one called upper face (202), oriented toward the operating zone (100), and the other called lower face (200),
said diffusion plate (2) comprising a first stage, called rectifier stage (20), a second stage, called orientation stage (21), and a third stage, called diffusion screen (22), said stages each having passage openings for a fluid stream (7),
the openings (205) of the rectifier stage (20) emerging on the lower face (200) of the diffusion plate (2) and communicating with the openings (215) of the orientation stage (21), said openings (205) of the rectifier stage (20) being configured to orient the fluid stream, entering the diffusion plate (2) by its lower face (200), in a first direction, for example vertical,
the openings (215) of the orientation stage (21) communicating with the openings of the diffusion screen (22), said openings of the orientation stage (21) being configured to orient the fluid stream (7), leaving from the openings of the rectifier stage (20), in a second oblique direction relative to said first direction and relative to said upper face (202) of the plate (2),
each opening of the diffusion screen (22) emerging on the upper face (202) of the plate (2) and having a passage section whereof the surface is smaller than that of each of said openings (215) of the orientation stage (21),
characterized in that the separating zone (201) of the rectifier stage (20) and the orientation stage (21) has a part (201 a), called parallel part, substantially parallel to the upper face (202) of the diffusion plate and a part (201 b), called inclined part, inclined relative to the upper face (202), said inclined part (201 b) extending between said parallel part (201 a) and a free end side (212) of the plate (2) at which an operator can position himself,
and in that said inclined part (201 b) extends from a low point (PB) situated at the parallel part (201 a) to a high point (PH) situated at said free end of the plate. - The device according to claim 1, characterized in that the inclined part (201 b) is rectilinear.
- The device according to claim 1, characterized in that the inclined part (201 b) is curved, and the curve center of the inclined part (201 b) is oriented toward the upper face (22) of said plate (2).
- The device according to one of the preceding claims, characterized in that the thickness of the diffusion screen (22) is smaller than that of the orientation stage (21) or the rectifier stage (20).
- The device according to one of the preceding claims, characterized in that said device comprises a panel, called work plane (1), preferably with a thickness substantially equal to that of the diffusion plate (2), which extends the diffusion plate (2) from the side of one edge (211), called inner edge, of the diffusion plate (2), opposite the edge (212), called outer edge, at which operator (9) can position himself to manipulate products above the diffusion plate (2),
and in that said second direction corresponding to the orientation of the openings (215) of the orientation stage (21) is chosen so as to orient the fluid stream (7) on the upper face (202) of the plate (2) while moving away from the outer edge (212) of the diffusion plate (2). - The device according to one of the preceding claims, characterized in that said high point (PH) is situated on, or near, the outer upper edge of the diffusion plate (2), defined by the junction of the upper face (202) of the plate and said outer edge (212).
- The device according to one of the preceding claims, characterized in that the orientation stage (21) and/or the rectifier stage (20) comprises a cellular structure, preferably a honeycomb, said cells forming the openings of said stage.
- The device according to claim 7, characterized in that the cells of the orientation stage (21) are offset relative to the cells of the rectifier stage (20) with which they communicate.
- The device according to one of the preceding claims, characterized in that said diffusion screen (22) is formed by a woven canvas, preferably made from plastic, such as polyethylene.
- The device according to one of the preceding claims, characterized in that said device comprises a box (8) having an air inlet (81) and an air outlet (82) emerging on the lower face (200) of the diffusion plate (2), and a fan (6) arranged, preferably inside the box (8), to circulate a fluid stream (7) from the inlet toward the outlet of said box (8).
- The device according to claim 10, characterized in that said device comprises means for regulating the speed of the fluid stream, said speed regulating means comprising a speed sensor (5) and a unit (61) for steering the fan (6) as a function of the fluid stream speed acquired by the sensor (5) to keep the speed of the fluid stream at the outlet of the diffusion plate (2) substantially equal to a setpoint value.
- The device according to claim 11, characterized in that said speed sensor comprises a housing (52) that extends through a wall of the box (8) and in which a fluid inlet (51) is arranged on the inner side of the box and a fluid outlet (53) is arranged on the outer side of the box, said housing (52) accommodating a probe (50) for acquiring the speed of the fluid stream circulating between the inlet and the outlet of the housing (52),
and in that said sensor (5) is designed to generate a pressure loss, with respect to the fluid traversing it, substantially equal to that generated by the diffusion screen (22). - The device according to one of claims 11 and 12, characterized in that said speed sensor (5) is situated between the fan (6) and the air outlet (82) of the box (8).
- The device according to one of claims 10 to 13, characterized in that said device comprises a filter, called pre-filter (30), situated upstream from the fan (6), preferably at the inlet of said box, and/or a filter (31), situated downstream from the fan (6), preferably between the fan (6) and the speed sensor (5).
- The device according to one of claims 10 to 14, characterized in that said box (8) is situated below the plane passing through the lower face (200) of the diffusion plate (2).
- A method for handling products above a plate, called diffusion plate, characterized in that said diffusion plate is part of a protection device for an operating zone (100) according to one of the preceding claims and for which the fluid stream diffused on the upper face is oriented in an oblique direction relative to the normal to the plate,
and in that an operator positions himself on the side of the plate that is opposite the direction of said fluid stream diffused on the upper face.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1357048A FR3008782B1 (en) | 2013-07-18 | 2013-07-18 | DEVICE FOR PROTECTING AN OPERATION AREA AND CORRESPONDING METHOD |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2848873A1 EP2848873A1 (en) | 2015-03-18 |
EP2848873B1 true EP2848873B1 (en) | 2016-09-07 |
Family
ID=49546542
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP14177330.9A Active EP2848873B1 (en) | 2013-07-18 | 2014-07-16 | Device for protecting an operation area and corresponding method |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP2848873B1 (en) |
FR (1) | FR3008782B1 (en) |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3530781A (en) * | 1968-04-11 | 1970-09-29 | Lundberg Concrete Pipe Co Inc | Transformer housing and vented cover assembly |
US3660956A (en) * | 1970-06-29 | 1972-05-09 | Brooks Products Inc | Grating construction |
GB1583995A (en) * | 1976-06-05 | 1981-02-04 | Colt Int Ltd | Ventilators |
JP5389194B2 (en) * | 2010-02-15 | 2014-01-15 | 興研株式会社 | Local clean zone forming device |
-
2013
- 2013-07-18 FR FR1357048A patent/FR3008782B1/en not_active Expired - Fee Related
-
2014
- 2014-07-16 EP EP14177330.9A patent/EP2848873B1/en active Active
Also Published As
Publication number | Publication date |
---|---|
EP2848873A1 (en) | 2015-03-18 |
FR3008782B1 (en) | 2017-12-29 |
FR3008782A1 (en) | 2015-01-23 |
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