Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
  • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
  • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
  • B03C3/02—Plant or installations having external electricity supply
  • B03C3/04—Plant or installations having external electricity supply dry type
  • B03C3/08—Plant or installations having external electricity supply dry type characterised by presence of stationary flat electrodes arranged with their flat surfaces parallel to the gas stream
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
  • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
  • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
  • B03C3/02—Plant or installations having external electricity supply
  • B03C3/04—Plant or installations having external electricity supply dry type
  • B03C3/12—Plant or installations having external electricity supply dry type characterised by separation of ionising and collecting stations
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
  • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
  • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
  • B03C3/34—Constructional details or accessories or operation thereof
  • B03C3/40—Electrode constructions
  • B03C3/41—Ionising-electrodes
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
  • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
  • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
  • B03C3/34—Constructional details or accessories or operation thereof
  • B03C3/40—Electrode constructions
  • B03C3/45—Collecting-electrodes
  • B03C3/47—Collecting-electrodes flat, e.g. plates, discs, gratings
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
  • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
  • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
  • B03C3/34—Constructional details or accessories or operation thereof
  • B03C3/40—Electrode constructions
  • B03C3/60—Use of special materials other than liquids
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
  • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
  • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
  • B03C3/34—Constructional details or accessories or operation thereof
  • B03C3/66—Applications of electricity supply techniques
  • B03C3/70—Applications of electricity supply techniques insulating in electric separators
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
  • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
  • B03C2201/00—Details of magnetic or electrostatic separation
  • B03C2201/06—Ionising electrode being a needle

Definitions

• the technical context of the present invention is that of air purification devices, and in particular particle filtering. More particularly, the invention relates to a collector stage of an electronic particle filtration device, as well as such an electronic particle filtration device. These technologies are also known as electrostatic precipitation and electrofiltration.
• Air filtration is a widely used technology in building design.
• double-flow ventilation systems are increasingly used which incorporate mechanical filters in order to retain some of the suspended particles present in the air.
• air handling units comprising one or more filtration chambers formed by mechanical filters.
• FIGURE 1 The principle of operation of known electronic filters is shown in FIGURE 1. It consists of two successive steps taken according to the direction of the air flow in the electronic filter
• Each armature is brought to different electric potentials in order to generate an electric field between them.
• a first known drawback of electronic filters lies in the emission of secondary pollutants, and in particular ozone, which are harmful to health and to ventilation ducts.
• These secondary pollutants are emitted during electrostatic discharges which can occur between the armatures of electronic filters and because of the very high values of electric fields generated between them. Indeed, when these electrostatic discharges occur between the two armatures, by the Corona effect, also called the peak effect, a cold plasma is created and releases ozone.
• a second known drawback of these electronic filters lies in the noise pollution produced by transient electrostatic discharges between the armatures, triggered for example by the presence of dust or by the humidity of the air passing through the electronic filters.
• a third known drawback of these electronic filters lies in their bulk, the electrical insulation distances between elements not being suitable for compact devices.
• the object of the present invention is to provide a novel collector stage of an electronic particle filtration device in order to at least largely meet the above problems and further lead to other advantages.
• Another object of the invention is to limit the emission of pollutants during the operation of such a collector stage. Another object of the invention is to reduce the noise pollution of such a collector stage.
• Another object of the invention is to improve the electrical safety of such a collector stage by avoiding any risk of electrostatic discharge on an individual touching it.
• Another object of the invention is to allow compact shaping, in air passage sections of the order of 10 cm per side or less, by reducing the insulation distances usually used in electrostatic precipitators.
• At least one of the aforementioned objectives is achieved with a collecting stage of an electronic particle filtration device, the collecting stage comprising at least one collection assembly comprising (i) a frame potential and (ii) a collector plate located opposite the potential armature, each collection assembly having a non-zero electric potential difference between the potential armature and the collector plate.
• a central core located opposite the collector frame is covered with an electrical insulator.
• the electronic filtration device is configured to filter particles contained in an air stream.
• the collector stage makes it possible - when it is implemented in such an electronic filtration device - to generate a strong electric field between the plates of the collector stage, resulting from the difference in electric potential between they. In the presence of such an electric field, the particles - previously charged by an ionization stage of the electronic filtration device - which engulf between the frames of the collector stage are deflected in the direction of the collector frame.
• the potential armature is brought to an electric potential greater than that of the collector armature.
• the potential armature is brought to a positive electric potential while the potential armature is connected to an electric ground, and has an electric potential lower than that of the potential armature, or even zero.
• the potential armature is brought to an electrical potential lower than that of the collector armature.
• the reinforcement potential is brought to a negative electric potential while the potential armature is connected to an electric ground, and has an electric potential greater than that of the potential armature, or even zero.
• the collector armatures and the potential armatures of the collector stage are advantageously flat, possibly curved. Preferably, they are all parallel to each other.
• the heart of the potential armature is the part of the potential plate which is located in front of the collector plate, the heart being formed by at least one surface covering the potential and collector plates.
• at least part of the core of the potential armature is covered with an electrical insulator located on one face of the potential armature located opposite the collector armature.
• the heart of the potential armature can be directly electrically conductive or formed of one or more alternately electrically conductive and insulating layers.
• electrical insulator a material whose dielectric strength is greater than 5 kV / mm.
• a material is considered to be electrically conductive when it allows the circulation of electrons producing an electric current of very low intensity, of the order of a nano-Ampere, without requiring a high electric voltage, that is to say - say less than a few tens of Volts.
• a material is electrically conductive when its electrical resistivity is less than 10 5 Ohms. metre.
• the collector stage in accordance with the first aspect of the invention makes it possible to limit the occurrence of an electric arc between the potential armature and the collector armature, in particular in the presence of air laden with humidity between said armatures.
• this configuration does not adversely affect the filtration efficiency of the collector stage, the filtration efficiency being taken as the rate of capture of particles passing through the collector stage relative to the number of particles entering said collecting stage.
• the collector stage in accordance with the first aspect of the invention advantageously comprises at least one of the improvements below, the technical characteristics forming these improvements being able to be taken alone or in combination: -
• the potential armature and the collector armature each take the form of a plate comprising an electrically conductive foliage.
• the plate forming the potential armature and / or the collector armature may be formed of a stack of alternately electrically conductive and electrically insulating foliage.
• the electrically conductive material is predominantly covered with an electrically insulating material, so that the electrically conductive material is not directly in contact with the air and / or in direct contact with the opposite armature of the collection set.
• the potential armature and / or the collector armature of each collection assembly are each formed of a printed circuit board.
• the plate forming the potential armature and / or the collector armature may be formed of an electrically conductive material, such as for example copper or any type of metal alloy.
• the electrically conductive material is predominantly in direct contact with the air and / or in direct contact with the opposing frame of the collection assembly;
• the heart of the potential armature of each collection set is covered with electrical insulation on a face opposite to the collector armature of said collection set.
• This advantageous configuration improves the operation of the collector stage and improves the electrical insulation of the potential armature.
• the collector stage comprises several collection assemblies
• the electrical insulation of the heart of the potential armature on its two opposite faces makes it possible to place the electrical insulation opposite each air gap formed by two armatures. opposite the collector floor;
• the potential armature of each collection assembly comprises a peripheral margin at the heart, the peripheral margin being covered with the electrical insulator on a face facing the collecting plate of said collection assembly and / or on a face opposite to the collector reinforcement of said set of collection.
• the peripheral margin extends over all or part of the heart.
• the peripheral margin forms a sidewalk which extends around the periphery of all or part of the heart of the potential reinforcement.
• a central zone of the collector armature located opposite the potential armature is covered with an electrical insulator.
• this configuration advantageously improves the efficiency of the collector stage and limits or even prevents the effects of breakdown during its operation.
• the core area of the collector armature is covered with electrical insulation on one face of the collector armature located opposite the potential armature;
• the central area of the collector armature of each collection set is covered with electrical insulation on a face opposite the potential armature of said collection set.
• the collector armature of each collection assembly comprises a zone peripheral to the central zone, the peripheral zone being covered with the electrical insulation on a face facing the potential armature of said collection assembly and / or on one side opposite to the potential armature of said collection set.
• the peripheral zone extends over all or part of the central zone of the collector frame.
• the peripheral zone forms a sidewalk which extends around the periphery of all or part of the central zone of the collecting reinforcement.
• the electrical insulator comprises (i) a first electrical insulator formed by the electrical insulator, the first electrical insulator being in contact with the potential armature and / or the collector armature of each collection assembly, and (ii) a second electrical insulator superimposed on the first electrical insulator.
• this configuration makes it possible to limit the insulation of the central zones of the collector reinforcements and / or of the cores of the potential reinforcements, and thus to avoid excessively reducing the filtration performance of the collector stage in accordance with the first aspect of the invention
• the second electrical insulator covers the peripheral margin of the potential armature and / or the peripheral zone of the collecting armature.
• the electrical insulation of the peripheral margin of the potential reinforcement is reinforced with respect to the electrical insulation of the heart of said reinforcement and / or the electrical insulation of the peripheral zone of the collector reinforcement. is reinforced with respect to the electrical insulation of the central zone of said reinforcement.
• a thickness of the electrical insulator is greater than the level of the peripheral margin of the potential armature, relative to the thickness of the electrical insulator taken at the level of the heart of said armature and / or the thickness of the armature.
• the electrical insulation is greater than the level of the peripheral zone of the collector reinforcement, relative to the thickness of the electrical insulation taken at the level of the central zone of said reinforcement;
• the second electrical insulator covers part of the heart of the potential armature located near the peripheral margin and / or the second electrical insulator covers part of the central zone of the collector armature located at proximity to the peripheral area.
• the second electrical insulator partially covers part of the heart proximal to the peripheral margin of the potential armature, and / or the second electrical insulator partially covers part of the proximal central area of the peripheral area of the collector reinforcement;
• a length of overlap of the second insulator on the part of the core and / or on the part of the central zone is between 0.5 mm and 5 mm .
• the overlap length is equal to 3 mm.
• the overlap length is taken in a direction perpendicular to the edge of the potential reinforcement and / or to the edge of the collector reinforcement, from an outer edge of the core of the potential reinforcement and / or of the central zone of the collecting frame, and in the direction of said core and / or said central zone;
• a thickness of the first and of the second electrical insulator is between 100 nm and 500 ⁇ m;
• the first electrical insulator is identical to the second electrical insulator, or the first electrical insulator is different from the second electrical insulator;
• the first electrical insulator and the second electrical insulator are chosen from electrical insulating varnishes, thermoplastic films, plastic coatings and plastic overmoldings.
• the first electrical insulator and the second electrical insulator may take the form of an anodization produced on the surface of the potential armature and / or of the collector armature. This configuration is particularly advantageous in the case where the potential armature and / or the collector armature is formed from an aluminum plate, since they confer on the plates thus treated a biocidal effect which is sought after for such collecting stages of pressure devices. electronic filtration.
• the first electrical insulator is a sparing varnish
• the second electrical insulator is a tropicalization varnish
• the potential armature of a first collection set is located (i) at a first side, opposite of a collecting frame of the first collection set, and (ii) at a second side opposite the first side, facing a collecting frame of a second collection set.
• the potential plates and the collector plates are all located in alternation from each other, each collector plate being adjacent to a potential armature and vice versa;
• a dimension of the peripheral margin of the potential reinforcement taken between an outer edge of the heart of said potential reinforcement and a free edge of said peripheral margin, and / or a dimension of the peripheral zone of the collector reinforcement, taken between an outer edge of the central zone of said collecting frame and a free edge of said peripheral zone, is between 2 mm and 4 mm.
• this dimension is equal to 3 mm;
• a distance taken between the potential armature and the collector armature is between 2 mm and 4 mm. Preferably, this distance between two consecutive reinforcements is equal to 3 mm.
• an electronic particle filtration device comprising (i) an electrical source, (ii) a collector stage in accordance with the first aspect of the invention or according to the invention. 'any of its improvements, each collection assembly of the collector stage being polarized by the electrical source, (iii) a sheath forming an air stream across which the collector stage extends, (iv) a ionization stage configured to electrically charge particles passing through the air stream.
• the ionization stage is located upstream of the collector stage.
• the electronic filtration device according to the second aspect of the invention thus exhibits higher performance compared to the filtration devices.
• known electronic filtration Indeed, the electrical insulation of the reinforcements forming its collector stage - as presented above - makes it possible to limit the appearance of tracing effects, reducing both the noise pollution of such an electronic filtration device and the production of harmful secondary pollutants, such as ozone.
• the electronic filtration device advantageously comprises at least one of the improvements below, the technical characteristics forming these improvements can be taken alone or in combination:
• the electrical source is advantageously of the type of a high voltage source.
• the electrical source is of the type of a continuous supply.
• the electrical source is of the type of an AC source;
• the potential plates and the collector plates are elliptical, circular or polygonal shapes
• the potential frames and the collector frames of all collection sets extend from one inner side of the cladding to the other.
• a ventilation system comprising an electronic filtration device in accordance with the second aspect of the invention or according to any one of its improvements and a member generating a non-zero air flow. through the air stream.
• the member generating the air flow is fluidly coupled to the air stream.
• the member generating the air flow is configured to blow air through the sheath.
• the member generating the air flow is configured to suck air through the air duct.
• it may be a turbine generating a vacuum or a pump.
• FIG. 1 illustrates a schematic side and top view of a first embodiment of the collector stage according to the first aspect of the invention
• FIG.2 illustrates a schematic side and top view of a second embodiment of the collector stage according to the first aspect of the invention
• FIG.3 illustrates a schematic side and top view of a third embodiment of the collector stage according to the first aspect of the invention
• FIG. 4 illustrates a schematic view of the electronic filtration device according to the second aspect of the invention
• FIG.5 illustrates a transverse view of the air stream of the electronic filtration device according to a first embodiment
• FIG.6 illustrates a transverse view of the air stream of the electronic filtration device according to a first exemplary embodiment
• FIG.7 illustrates a transverse view of the air stream of the electronic filtration device according to a first exemplary embodiment.
• the characteristics, the variants and the different embodiments of the invention can be associated with one another, in various combinations, insofar as they are not incompatible or mutually exclusive. It is in particular possible to imagine variants of the invention comprising only a selection of characteristics described below in isolation from the other characteristics described, if this selection of characteristics is sufficient to confer a technical advantage or to differentiate the invention from in the state of the prior art. In particular, all the variants and all the embodiments described can be combined with one another if there is nothing to prevent this combination from a technical point of view.
• FIGURES 1 to 3 illustrate schematic views of three embodiments of the collector stage 10 according to the first aspect of the invention.
• such a collector stage 10 comprises a plurality of collection assembly 1, each collection assembly 1 comprising a potential armature 11;
• each collection assembly 1 having a non-zero electric potential difference between the potential armature 11 and the collector plate 12;
• the potential armature 11 is aligned laterally with respect to the collector armature, so that a lateral edge 2 of the collector armature 12 is aligned with the edge side 2 of the potential armature 11.
• an electrical insulator 13 covers at least a central core 111 of the potential armature 11 and located opposite the collector armature 12. More particularly, for a given collection set 1, the potential armature 11 comprises an active face 112 directly facing an active surface 122 of the collector armature 12, and the part of the core 111 systematically covered with the electrical insulator is located on the side of the active face 112 of the potential armature 11.
• FIGURES 1 to 3 the surfaces of the reinforcements covered by the electrical insulator 13 are represented by hatched surfaces.
• the heart 111 is located at the level of a middle zone of the potential armature 11, so that the entire surface of the heart 111 is located directly opposite a part of the plate. collector 12. In the embodiment illustrated in FIGURE 1, only the heart 111 of the potential armature 11 is covered, in whole or in part, by the electrical insulator 13.
• the potential armature 11 and the collector armature 12 of the collector assemblies 1 each take the form of a plate.
• the plate is at least partly electrically conductive:
• the collector plate 12 and the potential plate 11 are simply formed of a conductive plate 3 made of an electrically conductive material, such as for example copper;
• the collector armature 12 and the potential armature 11 are formed from a stack of alternately electrically conductive and electrically insulating foliage. More particularly, in the examples illustrated in FIGURES 2 and 3, the collector plate 12 and the potential plate 11 each comprise a substrate 4 housed between two conductive plates 3. By way of example, such plates 11, 12 can be formed from a printed circuit board.
• the potential plates 11 and the collector plates 12 are advantageously all parallel to each other, so as to form an air gap between them, taken in pairs.
• the potential plates 11 and the collector plates 12 are preferably all planar, or possibly all curves.
• the potential plates 11 and the collector plates 12 all have the same geometric conformation that the air gap is of substantially constant length between them.
• the potential armature 11 of each collection set 1 comprises a peripheral margin 113 located on the periphery of the heart 111 of the potential armature 11. More particularly, the peripheral margin 113 forms a sidewalk which encircles the heart 111 of the potential armature 11. In a particularly clever manner, the peripheral margin 113 is formed of the substrate 4 of the potential armature 11.
• the collecting frame 12 of each collection assembly 1 comprises a peripheral zone 123 located on the periphery of a central zone 121 of said collecting armature 12 - analogous to the heart 111 of the potential armature 11. More particularly, the peripheral zone 123 forms a sidewalk which encircles the central zone 121 of the collecting armature 12. In a particularly clever manner, the peripheral zone 123 is formed of the substrate 4 of the collector frame 12.
• the embodiments illustrated in FIGURES 2 and 3 illustrate complementary overlaps of the potential & 1 and collector 12 armatures by the electrical insulator 13. More particularly, the collector armature 12 and the potential armature 11 are entirely covered there by the electrical insulator 13. In in other words, the electrical insulator 13 completely surrounds the potential plates 11 and the collector plates 12, each surface of the plates being covered by a non-zero thickness of the electrical insulator 13.
• the collector frame 12 is covered with the electrical insulation 13 at the level:
• the electrical insulator 13 is of constant thickness all around the collector plate 12 on the one hand, and the potential armature 11 on the other hand.
• the electrical insulation is reinforced at the level of the peripheral margin 113 of the potential armature 11 and at the level of the peripheral zone 123 of the collector plate 12.
• the 'electrical insulator 13 comprises:
• the second electrical insulator 132 covers the peripheral margin 113 of the potential armature 11, and the second electrical insulator 132 covers the peripheral zone 123 of the collector armature 12.
• This configuration thus allows to reinforce the electrical insulation of the peripheral margin 113 of the potential armature 11 on the one hand and of the peripheral zone 123 of the collector plate 12 on the other hand, respectively with respect to the electrical insulation of the core 111 of the potential armature 11 and to the electrical insulation of the central zone 121 of the collector plate 12.
• a thickness of the electrical insulator 13 is greater than the level of the peripheral margin 113 and of the peripheral zone 123, relative to the thickness of the electrical insulator 13 taken respectively at the level of the heart 111 and central zone 121.
• the second electrical insulator 132 covers part of the core 111 of the potential armature 11 located near the peripheral margin 113 of said potential armature 11. In other words, the second electrical insulator 132 covers partially a part of the heart 111 proximal to the peripheral margin 113 of the potential reinforcement. Thus, the second insulator 132 protrudes from the peripheral margin 113 onto the part of the core 111 located directly near the peripheral margin 113; and or
• the second electrical insulator 132 covers part of the central zone 121 of the collector plate 12 located near the peripheral zone 123 of said collector plate 12. In other words, the second electrical insulator 132 partially covers part of the central zone 121 proximal to the peripheral zone 123 of the collecting frame 12. Thus, the second insulator 132 overflows from the peripheral zone 123 onto the part of the central zone 121 situated directly close to the peripheral zone 123.
• a length of overlap of the second insulator 132 on the part of the core 111 and / or on the part of the central zone 121 as described above is of the order of a length of the air gap between the collector armature 12 and the potential armature 11 of a given collection set 1.
• the length of the second insulator 132 covering the part of the core 111 and / or the part of the central zone 121 is between 0.5 mm and 5 mm, preferably equal to 3 mm.
• the overlap length is taken in a direction perpendicular to the edge 21 of the potential armature 11 and / or to the edge 22 of the collector armature 12, respectively from an outer edge of the core 111 of the voltage armature. potential 11 and / or of the central zone 121 of the collecting frame 12, and in the direction of said core 111 and / or of said central zone 121.
• the first electrical insulator 131 and the second electrical insulator 132 have a dielectric strength greater than 5 kV / mm.
• the first electrical insulator 131 and the second electrical insulator 132 are configured to prevent breakdown between a potential armature 11 and a collector armature 12 in humid air up to 100% relative humidity.
• the first electrical insulator 131 and the second 132 are chosen from among electrical insulating varnishes, thermoplastic films, plastic coatings and plastic overmoldings.
• the first electrical insulator 131 is of the type of a varnish saving ; and the second electrical insulator 132 is of the type of a tropicalization varnish.
• an electronic filtration device 30 comprising:
• an electrical source 32 preferably of the type of a high voltage source
• an ionization stage 31 configured to electrically charge particles passing through the air stream 35.
• FIGURE 4 illustrates a schematic side view of the electronic filtration device 30 according to the second aspect of the invention
• FIGURES 4 to 7 illustrate 3 different embodiments of the air stream 35 formed by the sheath 33, seen in a cross section of said electronic filtration device 30.
• FIGURE 4 an air flow passing through the electronic filter device 30 is illustrated by the arrows F: such an air flow passes through the electronic filter device 30 from the left to the right of FIGURE 4.
• the air stream 35 propagates across the entire electronic filtration device 30, that is to say both across the ionization stage 31 and across the collector stage 10.
• the ionization stage 31 is located upstream of the collector stage 10.
• each collection assembly 1 of the collector stage 10 is biased by the electrical source 32. More particularly, the electrical source 32 is electrically connected to each potential armature 11 and each collector armature 12 of the collector stage 10, in order to create an electric field across the air stream 35 taken at the level of the collector stage 10, and more particularly between two reinforcements 11, 12 directly facing each other .
• the potential armatures 11 and the collector plates 12 of all the collection sets 1 are supported by rails 34 integral with the sheath 33, respectively at their peripheral margin 113 and their peripheral zone 123.
• the potential plates 11 and the collector plates 12 of the collector stage 10 are connected to the electric source 32 so as to be alternately brought to a different electric potential.
• This configuration allows the potential difference between two consecutive plates 11, 12 to induce a Coulomb force which drives the particles, electrically charged by the ionization stage 31, towards the collecting plates 12.
• the potential difference between the plates 11 , 12 induces an electric field close to, or greater than, the value of the disruptive field in humid air, ie approximately 10 6 V / m.
• the potential plates 11 and the collector plates 12 of all the collection assemblies 1 extend on either side of the sheath 33, across the air stream 35, so that, in a plane transverse to the air flow F shown in FIGURE 4, the potential plates 11 and the collector plates collectively take the form of the sheath 33.
• the collector stage 10 has a transverse profile in the shape of a square: the potential plates 11 and the collector plates 12 have dimensions and are arranged in such a way that 'they match the square section of the sheath 33.
• the collector stage 10 has a transverse profile in the shape of a circle: the potential plates 11 and the collector plates 12 have dimensions and are arranged in such a way that 'they match the circular section of the sheath 33.
• the collector stage 10 has a transverse profile in the form of an annular arc: the potential plates 11 and the collector plates 12 have dimensions and are arranged in a curved manner. , so that they match the annular section of the sheath 33.
• the invention relates to a collector stage 10 of an electronic filtration device 30 in which the potential plates 11 and / or the plates manifold 12 are at least partially covered with an electrical insulator 13 at the level of the air gap in order to limit the appearance of peak effects during the operation of the electronic filtration device 30.

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• Electrostatic Separation (AREA)
• Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

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• 2020
  • 2020-10-15 CA CA3151194A patent/CA3151194A1/fr active Pending
  • 2020-10-15 JP JP2022519286A patent/JP2022552113A/ja active Pending
  • 2020-10-15 EP EP20800236.0A patent/EP4045170A1/fr active Pending
  • 2020-10-15 BR BR112022005456A patent/BR112022005456A2/pt not_active Application Discontinuation
  • 2020-10-15 WO PCT/FR2020/051840 patent/WO2021074534A1/fr unknown
  • 2020-10-15 KR KR1020227010851A patent/KR20220078590A/ko unknown
  • 2020-10-15 CN CN202080069194.4A patent/CN114466701A/zh active Pending

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