EP0936946B1 - Filtre a air electronique ionisant et polarisant - Google Patents

Filtre a air electronique ionisant et polarisant Download PDF

Info

Publication number
EP0936946B1
EP0936946B1 EP96934280A EP96934280A EP0936946B1 EP 0936946 B1 EP0936946 B1 EP 0936946B1 EP 96934280 A EP96934280 A EP 96934280A EP 96934280 A EP96934280 A EP 96934280A EP 0936946 B1 EP0936946 B1 EP 0936946B1
Authority
EP
European Patent Office
Prior art keywords
ionizing
pad
grid
fibrous
screen
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP96934280A
Other languages
German (de)
English (en)
Other versions
EP0936946A1 (fr
Inventor
Constantinos J. Joannou
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0936946A1 publication Critical patent/EP0936946A1/fr
Application granted granted Critical
Publication of EP0936946B1 publication Critical patent/EP0936946B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • B03C3/34—Constructional details or accessories or operation thereof
    • B03C3/38—Particle charging or ionising stations, e.g. using electric discharge, radioactive radiation or flames
    • 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
    • B03C3/14—Plant or installations having external electricity supply dry type characterised by the additional use of mechanical effects, e.g. gravity
    • B03C3/155—Filtration
    • 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

Definitions

  • This invention relates to gas and air filtration systems. In particular, it relates to the removal of fine particulates like dust from gaseous flows.
  • Precipitating filters while highly efficient, produce large numbers of ions and generate ozone. They also consume distinct quantities of current at high voltage, thereby requiring substantial power supplies.
  • Another type of electronic air filter is the non-ionizing, polarized dielectric media type. This is not as efficient as the precipitator type but it is cheaper and easier to maintain.
  • This filter uses filament pads of non-conducting, dielectric material sandwiched between charged and grounded screens which produce electrostatic fields to polarize these pads. Any particulates passing through the filter also get polarized and they are attracted and collected by the packed filaments within the pads.
  • This type of system produces very few ions, if any at all, no ozone and consumes virtually no current. The power supply required is thus of a low power type.
  • the first patent describes a pair of outer hinged screens for enclosing a pair of glass fibre pads with a central grid located therebetween.
  • the central grid made of coarse wire mesh that is on the order of 0.5 millimetres in diameter, is charged to around 7000 volts and the outer screens are grounded. This combination does not generate ions significantly.
  • the spacing between the charged screens is between two and five centimetres, producing an electric field gradient. This field gradient polarizes the non-conducting glass fibres rendering them active in trapping dust particles, and more effective than non-polarized pads.
  • the precipitator type although it is very efficient when clean, because of the limited surface of the collecting plates, its efficiency drops as the filter loads up with dust.
  • the filter's loading capacity, especially for the larger particles, is very low.
  • Maintenance of the precipitator type filters is very tedious especially in industrial and commercial applications as the plates must be individually wiped to clean them. Also they are expensive both in original investment and operating costs. This is because they have very elaborate construction and have large, high voltage power supplies that consume anywhere from 80 to 150 watts.
  • the polarizing filter systems do not have the disadvantages of the precipitator filters but they lack efficiency.
  • Ozone is offensive to some and can be injurious above certain levels. Any system that relies on ionization should also minimize the production of ozone.
  • a filter for use in an ionizing air filter comprising:
  • an electronic air filter comprising:
  • the invention herein is based on ionizing dust particles to enhance their entrapment by a filter pad.
  • Ionization to effect charging of dust particles is achieved by providing an active ionizing grid in the form of a conductive path having multiple, exposed, ionizing points that, when charged, produce ions because of the high potential gradient formed around such sharp points.
  • the ionizing grid of the invention is located directly adjacent, and preferably bonded to a fibrous filter pad. Located on the opposite side of the pad from the grid, a conducting screen held at differing potential will provide an electrical field gradient across the thickness of the fibrous filter pad to induce ionization. Electrical coupling means are further provided to ensure that voltage is applied to an between the ionizing grid and screen when the pad is installed in a filter support frame.
  • a preferred way of providing an ionizing grid is to render a cord of multi-stranded filaments of short fibres, such as cotton, conductive.
  • Each fibre provides an end that is pointed and has around it a higher field gradient that the fibre itself, thereby creating ions in the region of the steep field gradient.
  • This grid of broken fibre lengths joined in a conductive string may be prepared by applying a conductive material, such as a high carbon ink, to the fibres.
  • a conductive path may similarly be deposited onto a fabric having similar filaments and fiber ends therein.
  • a source of ionization is provided that is substantially less expensive than a system based upon use of a filter support frame that carries a separate, fragile ionizing grid of fine wires. Further, maintenance of the system is facilitated by the ease by which the filter pad and ionizing grid, provided together in cartridge form, may be replaced. In this manner the convenience of a throw-away pad is combined with efficiencies based upon the use of ionization.
  • both polarization and ionization may be combined in one simple design by use of a fibrous filter pad of dielectric material positioned between a charged, active ionizing grid and an oppositely charged, preferably grounded, screen.
  • the active ionizing grid is positioned adjacent to and in contact with the pad upstream in the air flow in respect to the pad.
  • the charged, active grid provides a degree of ionization within the air flow thus charging dust particles passing through the filter and thereby constituting it an "ionizing grid".
  • the closeness of the ionizing grid and screen on opposite sides of the pad form a polarizing field gradient within the dielectric material of the pad that polarizes the dielectric material.
  • pads may be provided on both sides of such grid.
  • An optional, complementary second screen grid may be placed against the outside surface of this additional pad on the upstream side from which the airflow is originating.
  • the upstream pad in such case is advantageously exposed to rapidly diffusing ions which flow upstream against the air flow, charging dust particles present inside the first, upstream filter pad of a two pad unit. This increases the trapping efficiency of the combined assembly.
  • an additional ionizing grid may be placed on the upstream surface of the upstream, second screen of an air filter that has an upstream screen.
  • This additional ionizing grid is separated from and supported on the upstream screen by an insulating layer, such as a polyester film.
  • the convenience of this invention is that the filter pad material may be separately removable from between the ionizing grid and screen to further increase the efficiency of this air filter system.
  • the ionizing grid and filter pad material are bonded together for replacement and disposal as a unit.
  • a replaceable "cartridge” may include:
  • Figure 1 shows an exploded, perspective view of the components of a basic filter assembly with fine wires as the ionizing grid that is not claimed as the invention.
  • Figure 2 shows the construction of the assembled filter of Figure 1 in cross-sectional view.
  • Figure 3 shows a central grid composed of fine, ionizing wires for use in the filter assembly of figures 1 and 2.
  • Figures 4, 5 and 6 show the invention based on an ionizing grid that differs from the configurations of Figures 1 - 3 by the presence multiple, exposed ionizing points that form ions when charged to an ionizing potential.
  • Figure 7 shows an exploded perspective view of a filter assembly wherein the ionizing grid of Figure 4 is attached to one of the fibrous pads.
  • Figure 8 shows a perspective view of a hinged filter arrangement where the two outside screens are hinged together and a central ionizing grid is composed of wires and not claimed as the invention supported with insulating hinges. Power to the central grid is supplied by a high voltage power supply attached to one of the outside screen frames.
  • Figure 9 is a similar embodiment to that of Figure 8 except that the central ionizing grid incorporates the ionizing points of the invention and is attached to and carried by one of the fibrous pads.
  • High voltage to the grid is supplied via a conducting strip connected to a high voltage power supply.
  • Figure 10 is a similar arrangement to Figure 9 except that the ionizing grid is sandwiched between the fibrous pads that are bonded together enclosing a portion of the ionizing grid.
  • the conducting strip is exposed between portions of the pads that are not bonded together.
  • Figure 11 is an arrangement where the ionizing grid of the invention and conducting strip are fully contained between the fibrous pads which are bonded together to enclose the grid and strip.
  • Figure 12 shows how the arrangement of Figure 11 is used in a filter frame.
  • Figure 13 is a graph showing the removal of particles over time from a room using respectively a prior art polarized filter, and a filter according to the invention relying on an ionizing grid of conductive string with multiple ionizing points.
  • Figure 14 is a perspective view of a cartridge filter with an exterior ionizing grid of conductive string, according to the invention, fixed over an exterior screen by being mounted on insulating tape.
  • Figure 15 is an edge view of Figure 14.
  • Figure 16 is a graph showing the improved performance used by having a second, upstream ionizing grid.
  • Figure 1 shows one example of an assembly of components not incorporating a cartridge filter based on the invention, but instead relying upon use of very fine ionizing wires.
  • Two outside perforated retainers 1 form the outside frames of the filter.
  • Two outside conducting polarizing screens 2 are mounted within the frames 1.
  • Two dielectric fibrous pads 3, preferably made of glass fibres, are placed centrally between the polarizing screens 2.
  • the screens 2 are grounded.
  • Ionizing grid 4 Located centrally between the pads 3 is the ionizing grid 4.
  • Ionizing grid 4 in this embodiment comprises fine wires 5 which ionize the surrounding air when high voltage is applied to them by virtue of a high potential gradient which is present around the wires.
  • the diameter of wires 5 is preferably between 0.030 and 0.06 millimetres causing ionization when charged to a potential of between 5,000 and 10,000 volts, depending on the spacing of the screens 2.
  • the spacing between such wires is preferably from about 1 to 5 centimetres.
  • the spacing between the grid 4 and screens 2 is between one and two and one half centimetres in order to produce the desired polarizing field gradient.
  • the grid 4 charged with positive potential ions as this reduces the production of ozone.
  • Figure 1 depicts a symmetrical cartridge with the ionizing grid 4 carried between and adjacent to two filter pads 3, only one filter pad 3 need be employed. Use of a second filter pad 3 helps shield and protect the charged ionizing grid 4 and provides improved filtration efficiency.
  • FIG 2 shows a cross-sectional view of the cartridge filter shown in Figure 1 when assembled with a high voltage power supply 6 mounted along one side.
  • This power supply is connected to ionizing grid 4 via a high voltage contacting means in the form of a probe 7.
  • Power supply 6 and probe 7 may be mounted in an air filter support frame (not shown) but are preferably detachably attached to one side of the cartridge frame 1. (See U.S. Patent No. 4,828,586).
  • Figure 3 shows a detail of construction of central grid 4 which comprises fine ionizing wires 5.
  • Operation of the filter is as follows: High voltage (about 5 to 10 KV) is applied to central grid 4 which, by virtue of its fine wires, ionizes the air and dust particles in the space between grid 4 and outside screens 2. At the same time, because of the high voltage applied to grid 4, an electrostatic field is also created between grid 4 and grounded screens 2 and thus polarizes the non-conducting, dielectric fibrous pads 3. Dust particles or any particulate matter entering the filter become charged due to ionization and are attracted and collected by the polarized fibrous pads 3. This double action of ionization and polarization makes for a filter of improved efficiency.
  • Figure 4 shows an alternate construction of the central ionizing grid 4 which is the basis of the invention, identified herein.
  • a length of fibrous string 8 such as one made of cotton having broken fibre ends, is treated with a conducting solution, such as colloidal graphite, to render it conducting.
  • String 8 is attached to a conducting frame 9.
  • Fibrous string 8 which has been rendered conducting, because of its composition of fine fibres or filaments with multiple, sharp ends, functions the same way as fine wires in ionizing dust particles but produces more ions and less ozone.
  • Figure 5 shows another alternate construction of the invention where a fabric-based ionizing grid 10 laid over a pad 3 is formed by depositing conducting paint or colloidal graphite on a sheet of gauze 11.
  • Gauze 11 because of its composition of fine fibres and because it is rendered conducting, provides within the conductive material a grid 10 which functions the same way as fine wires 5 in effecting ionization.
  • FIG 6 shows another alternate construction for the central ionizing grid 4.
  • a paper-based grid 12 is formed by painting conducting paint or colloidal graphite on coarse, fibrous paper 13.
  • This paper 13 is perforated with perforations 14 to allow air to pass through.
  • This arrangement also functions the same way as grid 10 in effecting ionization of dust particles because the coarse fibrous paper also has fine fibers which act in the same manner as the fibers in string 8 of Figure 4.
  • Figure 7 shows an alternate construction for a cartridge filter assembly which is similar to the mechanical filter assembly shown in Figures 1 and 2 and an ionizing grid as in Figure 4.
  • the ionizing grid element is based on use of an electrical conductor in the form of a fibrous conductive string 5a composed of fine filaments with multiple filament ends attached to one of the fibrous filter trapping pads 3.
  • the fibrous string with its multiple filament ends is again made conductive by coating it with conductive material like colloidal graphite.
  • Conductive string 5a is connected to a high voltage power supply in a similar manner as shown in Figure 2. Operation of this filter is as described above.
  • FIG 8 shows a filter arrangement not claimed as the invention wherein two outer, conducting screens 2 within frames 1 are hinged together to form the outside of a filter cartridge.
  • Replaceable fibrous pads 3 are positioned on either side of central ionizing grid 4 of wires.
  • Grid 4 through its supporting frame, is attached to one of frames 1 by insulating hinges 17.
  • a high voltage power supply 6 is attached to one of the outside frames 1 and connects to grid 4 via electrode probe 7 when the filter assembly is closed. When closed, the grid 4 lies directly adjacent to the fibrous pad 3.
  • a cord 20 is connected to a low voltage power supply for supplying power to high voltage power supply 6. Operation of this filter is the same as described above for the cartridge filter shown in Figures 1 and 2.
  • Figure 9 shows a similar arrangement as that of Figure 8 except that in this case a conducting ionization grid 4a having multiple ionizing points according to the invention is attached on one side of one of the fibrous pads 3. Again, these fibrous pads 3 are removable for easy replacement.
  • Grid 4a is made by attaching fibrous, conducting elements with multiple ionizing ends directly onto the surface of. fibrous pad 3. Thus in Figure 9, the grid 4a is also removable and replaced with the installation of fresh pads.
  • Grid 4a is connected to power supply 6 via a frame-mounted conducting strip 22 and wire 23.
  • Strip 22 is attached to one of the frames 1 by insulating hinges 24.
  • Grid 4a functions the same way as the grid formed by the fibrous string 5a in Figure 7. As it is bonded to a pad 3 and is composed of an inexpensive ionizing structure that provides ionization at multiple pointed ends, it is readily disposable.
  • Figure 10 shows another filter arrangement similar to that of Figure 9.
  • the two filter media pads 3 are bonded together over part of their opposed surfaces as by gluing or stitching but portions of each of the pads 3 are left free so that, when placed collectively in the filter frame 1, metal strip 22 may be inserted between pads 3 to make contact with ionizing grid 5a.
  • the two bonded pads 3 with ionizing grid 4a there between make a convenient package for filter replacement.
  • Figure 11 shows another arrangement where the filter media pads 3 are bonded together over their entire opposed faces. Between the pads 3 ionizing grid 4a is held in place as by stitching or gluing, by friction, or by other suitable means. Metal strip 22 is also held in place between pads 3 to make contact with grid 4a.
  • Figure 12 shows how the arrangement of Figure 11 is used in a filter frame similar to that of Figures 8, 9 and 10.
  • high voltage from power supply 6 is supplied to strip 22 by insulated electrode 31 which connects to the high voltage power supply 6 through frame 1.
  • Electrode 31 is thin and narrow, enabling it to pierce one of pads 3 and touch strip 22 to complete the electrical circuit.
  • Figure 13 shows the results of comparative tests made on a 20" x 20" x 2'' prior art, cartridge-type, polarizing filter and a filter of similar dimensions with conductive fibrous strings to serve as an ionizing grid as ion contemplated by the invention.
  • the high voltage used was 10 KV on both cartridge filters.
  • the tests were made by generating smoke in asealed 570 cubic feet room.
  • a ventilator was used to circulate air through the filters and the level of contamination was measured using a CLIMET INNOVATION (TM) 500 particle counter.
  • the particle counter is capable of counting different particle sizes in the air as the air is drawn through the tube into the instrument.
  • the counts used were for particles down to a .3 micron size, which is the most difficult particle size to capture, and the most numerous.
  • the instrument was set to count the particles in .2 cubic feet of air every minute. All tests were made with 1000 cubic feet per minute (CFM) of air circulating through the filters as measured by an EBTRON (TM) air velocity meter.
  • CFM cubic feet per minute
  • FIG. 14 and 15 Another variant of the invention is shown in Figures 14 and 15.
  • a thin insulating strip of plastic such as polyester 37
  • an outer upstream screen 36 of a cartridge filter assembly 35 in this case in the shape of the letter "H”.
  • a fibrous conducting string 38 is attached on top of strip 37 and along its middle line.
  • a high voltage power supply (not shown in the drawings) is connected between string 38 and grounded screen 36.
  • String 38 is thereby charged to a voltage of between 5 KV and 12KV.
  • a high resistance value limiting resistor (not shown) in the high voltage source ensures that no danger of injurious electric shock can arise from contacting the charged string 38.

Landscapes

  • Electrostatic Separation (AREA)
  • Filtering Materials (AREA)

Claims (15)

  1. Filtre destiné à être utilisé dans un filtre à air ionisant, comprenant :
    (a) un tampon 3 de matériau non conducteur, fibreux ; et
    (b) un trajet conducteur 5a positionné au voisinage du tampon 3,
    caractérisé par le fait que le trajet conducteur 5a comprend une pluralité de filaments conducteurs ayant des points d'ionisation, exposés, multiples, formés aux extrémités des filaments, lesquels, une fois chargés à une tension ionisante, formeront des ions dans l'air environnant.
  2. Tampon selon la revendication 1, caractérisé par le fait que les filaments 5a se présentent sous la forme de longueurs de filaments multi-brins qui sont fixés au tampon 3.
  3. Tampon selon la revendication 1, caractérisé par le fait que les filaments conducteurs sont des parties d'un tissu fibreux poreux 11.
  4. Filtre électronique comprenant :
    (a) un écran conducteur 2 ;
    (b) un tampon fibreux 3 de matériau non-conducteur, positionné au voisinage dudit écran 2 ;
    (c) une grille ionisante 4, située sur le côté du tampon fibreux 3 opposé à l'écran 2 ; et
    (d) un moyen de couplage électrique pour recevoir un potentiel électrique provenant d'une source de haute tension 6 pour fournir un potentiel électrique ionisant entre ledit écran 2 et ladite grille 4,
    caractérisé par le fait que ladite grille ionisante 4 est située au voisinage dudit tampon 3 et espacée dudit écran 2 d'une distance, ladite grille 4 comprenant une pluralité de filaments conducteurs 5a ayant des points d'ionisation multiples formés aux extrémités des filaments pour fournir, une fois connectés à la source de haute tension 6, des ions dans un courant de gaz passant à travers eux, permettant ainsi de charger des composants particulaires présents à l'intérieur dudit courant de gaz pour augmenter le piégeage desdits composants particulaires chargés par ledit tampon 3.
  5. Filtre à air électronique selon la revendication 4, dans lequel le tampon fibreux 3 est fait d'un matériau diélectrique et la grille ionisante 4 est située au voisinage de et en contact avec le tampon fibreux 3, à l'opposé de l'écran 2, caractérisé par le fait que ladite grille ionisante 4 et ledit écran conducteur 2 effectuent une polarisation dudit tampon fibreux 3 lors de la connexion du moyen de couplage électrique 7 à la source de haute tension 6.
  6. Filtre à air électronique selon la revendication 4, caractérisé par le fait que ledit tampon est un premier tampon fibreux 3, ledit filtre ayant un second tampon fibreux 3 de matériau non-conducteur positionné au voisinage de la grille ionisante 4 à l'opposé dudit premier tampon fibreux 3, et dans lequel ledit écran conducteur 2 est un premier écran conducteur 2 et un second écran conducteur 2, qui est connecté électriquement au premier écran conducteur 2 et est positionné au voisinage du second tampon fibreux 3 sur le côté opposé à ladite grille ionisante 4.
  7. Filtre à air électronique selon l'une des revendications 4, 5 ou 6, caractérisé par le fait que lesdits filaments 5a sont fixés audit tampon fibreux 3.
  8. Filtre à air électronique selon l'une des revendications 4, 5 ou 6, caractérisé par le fait que lesdits filaments se présentent sous la forme de brins multiples de filaments.
  9. Filtre à air électronique selon l'une des revendications 4, 5 ou 6, caractérisé par le fait que lesdits filaments 5a se présentent sous la forme d'un tissu fibreux poreux 11.
  10. Filtre à air électronique selon l'une des revendications 4, 5 ou 6, caractérisé par le fait que lesdits filaments 5a se présentent sous la forme d'une feuille de papier perforé 13.
  11. Filtre à air électronique selon l'une des revendications 4, 5 ou 6, caractérisé par le fait que lesdits filaments 5a sont fournis par une feuille de papier fibreux, poreux 13, sur laquelle des parties conductrices sont formées par un dépôt 12 de matériau conducteur.
  12. Filtre à air électronique selon l'une des revendications 4, 5 ou 6, caractérisé par le fait que lesdits filaments 5a sont fournis par une feuille de papier fibreux 13, sur laquelle ledit filament conducteur est formé par un dépôt de matériau conducteur 12.
  13. Filtre à air électronique selon l'une des revendications 4, 5 ou 6, caractérisé par le fait que ladite pluralité de filaments conducteurs 5a comprend une ou plusieurs longueurs de cordon fibreux 5a rendu conducteur par un revêtement conducteur présent sur celui-ci.
  14. Filtre à air électronique selon la revendication 6, comprenant un autre conducteur ionisant 38 positionné sur un support isolant 37 porté par ledit second écran conducteur 26, ledit autre conducteur ionisant 38 fournissant des points d'ionisation exposés multiples pour effectuer, une fois fixé à une source de haute tension, l'ionisation à l'intérieur de l'air arrivant sur le filtre à air électronique pour passage à travers lui, une fois fixé à une source de haute tension.
  15. Filtre à air électronique selon l'une quelconque des revendications 4 à 13, caractérisé par le fait qu'il est en combinaison avec une source de tension 6 qui fournit un potentiel entre l'écran 2 et la grille 4 compris entre 5000 et 10 000 volts.
EP96934280A 1996-11-08 1996-11-08 Filtre a air electronique ionisant et polarisant Expired - Lifetime EP0936946B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CA1996/000730 WO1998020978A1 (fr) 1996-11-08 1996-11-08 Filtre a air electronique ionisant et polarisant

Publications (2)

Publication Number Publication Date
EP0936946A1 EP0936946A1 (fr) 1999-08-25
EP0936946B1 true EP0936946B1 (fr) 2002-05-08

Family

ID=4173178

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96934280A Expired - Lifetime EP0936946B1 (fr) 1996-11-08 1996-11-08 Filtre a air electronique ionisant et polarisant

Country Status (5)

Country Link
EP (1) EP0936946B1 (fr)
JP (1) JP2001503326A (fr)
CA (1) CA2270976C (fr)
DE (1) DE69621163D1 (fr)
WO (1) WO1998020978A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104258998A (zh) * 2014-08-19 2015-01-07 阮海生 获得非均匀电场的方法、装置及形成的尘粒过滤系统

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1985371A4 (fr) * 2006-02-14 2013-05-22 Kagome Kk Procede fongicide par adsorption de conidie utilisant une polarisation dielectrique, appareil permettant d'eliminer des organismes volants et appareil protegeant les plantes
DE202006014800U1 (de) * 2006-09-22 2006-12-21 Langner, Manfred H. Ionisierungsvorrichtung für Luftfilteranlagen
CA2704384A1 (fr) 2010-05-17 2011-11-17 Jeff Chesebrough Filtre a air electronique
KR101243844B1 (ko) 2011-08-29 2013-03-25 주식회사 누리21 전자에어필터
KR101385116B1 (ko) * 2012-05-08 2014-04-15 한국에너지기술연구원 고정식 전극이 적용된 공기정화용 여과장치 및 이를 포함한 공기정화장치
WO2016081680A1 (fr) * 2014-11-20 2016-05-26 Environmental Management Confederation, Inc. Connexion haute tension pour matériau épars
CN109805000B (zh) * 2019-03-29 2024-04-16 福建锦特新材料科技有限公司 一种带电防护网与其生产方法及应用其的帐篷
WO2021226639A2 (fr) * 2020-05-05 2021-11-11 Seegers Graham Neville Ensemble pour attirer et neutraliser des contaminants de l'air
RU201474U1 (ru) * 2020-07-30 2020-12-16 Александр Георгиевич Железнов Антивирусное электронное устройство
DE102021132295A1 (de) 2021-12-08 2023-06-15 RL-Raumlufttechnik und Raumluftqualität Gesellschaft mit beschränkter Haftung Vorrichtung zum Filtern eines mit Partikeln verunreinigten Luftstroms

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3763633A (en) * 1971-02-09 1973-10-09 C Soltis Electrostatic air filter
US4098591A (en) * 1975-05-07 1978-07-04 Bronswerk Heat Transfer B.V. Apparatus and method for removing non-conductive particles from a gas stream
DE3634538C2 (de) * 1986-10-10 1994-01-20 Hoelter Heinz Elektrofilter zur Reinhaltung von Luft
GB2265556A (en) * 1992-03-10 1993-10-06 Robert William Gibbs An electrostatic filter device
GB9217666D0 (en) * 1992-08-20 1992-09-30 Filter Design Technology Air filter
US5573577A (en) * 1995-01-17 1996-11-12 Joannou; Constantinos J. Ionizing and polarizing electronic air filter

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104258998A (zh) * 2014-08-19 2015-01-07 阮海生 获得非均匀电场的方法、装置及形成的尘粒过滤系统

Also Published As

Publication number Publication date
WO1998020978A1 (fr) 1998-05-22
CA2270976A1 (fr) 1998-05-22
CA2270976C (fr) 2003-04-29
EP0936946A1 (fr) 1999-08-25
JP2001503326A (ja) 2001-03-13
DE69621163D1 (de) 2002-06-13

Similar Documents

Publication Publication Date Title
US5573577A (en) Ionizing and polarizing electronic air filter
CA2520848C (fr) Systeme de filtre a air plisse auto-ionisant
EP0936947B1 (fr) Filtre a air a fonction ionisante vers l'exterieur
JP5369210B2 (ja) 集塵装置および空調装置
CA2167054C (fr) Electrofiltre
US3798879A (en) Air filter with electrostatic particle collection
AU2006330439B2 (en) Improved filter media for active field polarized media air cleaner
US7708813B2 (en) Filter media for active field polarized media air cleaner
AU2021277606B2 (en) Corrugated Filtration Media for Polarising Air Cleaner
US6790259B2 (en) Method and device for cleaning a gaseous fluid using a conductive grid between charging head and filter
US4133653A (en) Air filtration assembly
US11007537B2 (en) Filter media for active field polarized media air cleaner
WO2002020162A2 (fr) Filtre a cartouche electronique
WO2005035133A1 (fr) Filtre ameliore electriquement profond a faible baisse de pression
EP0936946B1 (fr) Filtre a air electronique ionisant et polarisant
WO2002020163A2 (fr) Filtre a air polarise electronique
AU713501C (en) Ionizing apparatus for an electronic air filter
CA2270979C (fr) Filtre a air a fonction ionisante vers l'exterieur
EP4357025A1 (fr) Dispositif d'épuration d'air de milieu polarisé par champ actif
TW434050B (en) Externally ionizing air filter

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19990519

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): CH DE ES FI FR GB IT LI NL

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

17Q First examination report despatched

Effective date: 20010613

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): CH DE ES FI FR GB IT LI NL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20020508

Ref country code: LI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20020508

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 20020508

Ref country code: FR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20020508

Ref country code: FI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20020508

Ref country code: CH

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20020508

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REF Corresponds to:

Ref document number: 69621163

Country of ref document: DE

Date of ref document: 20020613

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20020809

NLV1 Nl: lapsed or annulled due to failure to fulfill the requirements of art. 29p and 29m of the patents act
REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20021128

EN Fr: translation not filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed

Effective date: 20030211

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20031111

Year of fee payment: 8

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20041108

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20041108