WO1998020978A1 - Filtre a air electronique ionisant et polarisant - Google Patents

Filtre a air electronique ionisant et polarisant Download PDF

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Publication number
WO1998020978A1
WO1998020978A1 PCT/CA1996/000730 CA9600730W WO9820978A1 WO 1998020978 A1 WO1998020978 A1 WO 1998020978A1 CA 9600730 W CA9600730 W CA 9600730W WO 9820978 A1 WO9820978 A1 WO 9820978A1
Authority
WO
WIPO (PCT)
Prior art keywords
ionizing
pad
fibrous
conducting
grid
Prior art date
Application number
PCT/CA1996/000730
Other languages
English (en)
Inventor
Constantinos J. Joannou
Original Assignee
Joannou Constantinos J
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
Priority to PCT/CA1996/000730 priority Critical patent/WO1998020978A1/fr
Application filed by Joannou Constantinos J filed Critical Joannou Constantinos J
Priority to DE69621163T priority patent/DE69621163D1/de
Priority to JP52196698A priority patent/JP2001503326A/ja
Priority to AU72747/96A priority patent/AU713501C/en
Priority to EP96934280A priority patent/EP0936946B1/fr
Priority to CA002270976A priority patent/CA2270976C/fr
Priority to US08/876,369 priority patent/US6077334A/en
Priority to AU49373/97A priority patent/AU4937397A/en
Priority to EP97911985A priority patent/EP0936947B1/fr
Priority to CA002270979A priority patent/CA2270979C/fr
Priority to PCT/CA1997/000833 priority patent/WO1998020979A1/fr
Priority to DE69712508T priority patent/DE69712508D1/de
Publication of WO1998020978A1 publication Critical patent/WO1998020978A1/fr
Priority to NO992249A priority patent/NO992249L/no

Links

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.
  • an embodiment of the present invention is based upon use of a fibrous filter pad of dielectric material positioned between a charged, active grid and an oppositely charged, preferably grounded, screen.
  • the active grid is positioned adjacent to and in contact with the pad upstream in the air flow in respect to the pad.
  • 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.
  • This combination of charged dust particles and a polarized pad of dielectric fibers achieves high efficiency as an air filter, removing such dust particles from a stream of air more effectively than with either feature used separately.
  • Ionization to effect charging of dust particles may be achieved either by providing the active grid with fine wires which produce ions because of the high potential gradient formed around the fine diameter and sharp curvature of such wires; or by providing the grid with an array of fine, sharp points carried by conductive elements to produce ions by the same effect.
  • the ionizing grid is to be formed by providing an array of very fine wires, if the diameters of such wires is small enough, a high, ionizing field gradient can be formed without the application of exceptionally high external voltages.
  • wires with a diameter of from .03 to .06 millimetres will ionize air with an minimal to moderate production of ozone if charged to a potential of from 5 to 10 kilovolts of positive potential combined with a grounded screen positioned at about 10mm to 30mm from the ionizing wires.
  • Such wires are, however, fragile and expensive to employ.
  • An alternate convenient way of providing an ionizing grid is to render a cord of composite filaments of short fibres, such as cotton, conductive.
  • Each of the short fibres may be of a small enough diameter to effect ionization.
  • each fibre may provide an end that is pointed and has around it a higher field gradient than 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 woven fabric having similar filaments and fiber ends therein. It is desirable in such systems to minimize the production of ozone.
  • the provision of ionization with minimal production of ozone can be effected by a selection of the field gradient condition at the ionizing grid. As well, such grid can be positively charged as a positive electrode has a lesser tendency to create ozone.
  • such grid is preferably carried directly adjacent, and preferably bonded to a dielectric fibrous filter pad.
  • a conducting screen held at differing potential will provide an electrical field gradient across the thickness of the dielectric fibrous filter to polarize the fibres.
  • Electrical coupling means are further provided to ensure that voltage is applied to and between the ionizing grid and screen when the pad is installed in a filter support frame.
  • 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.
  • 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 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: 1) two dielectric fiber pads;
  • An optional second ionizing grid may be fixed on the outside of one screen.
  • Figure 1 shows an exploded, perspective view of the components of a basic filter assembly with fine wires as the ionizing grid.
  • 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 alternate arrangements for the ionizing grid in the configurations of Figures 1 and 2.
  • Figure 7 shows an exploded perspective view of a filter assembly wherein the ionizing grid 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 the central ionizing grid is 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 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 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.
  • Figure 14 is a perspective view of a cartridge filter with an exterior ionizing grid fixed over an exterior screen 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 constituting a cartridge filter based 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.
  • 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. While 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.
  • 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.
  • Figure 5 shows another alternate construction 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.
  • Figure 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 filter assembly shown in Figures 1 and 2.
  • 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
  • ionizing grid voltage from 5KV to 10KV kilovolts depending on the space between the ionizing grid on the grounded screens
  • ionizing grid charged with positive potential conducting element separation or spacing from 10mm to 30mm - grid to screen separation from 10mm to 30mm
  • Figure 8 shows a filter arrangement where 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.
  • 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 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 and grid 4 in the arrangement of Figures 1 and 2. However, 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, similar to but lower in cost than the filter cartridge of Figures 1 and 2.
  • 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 a sealed 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 EBTR0N ⁇ 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.
  • the conducting string 38 ionizes the air in the vicinity of the string by emitting charges 39 via its fine fibre ends. These charges ionize (charge) the dust particles in the space in front of the filter 35. The dust particles are then drawn into the filter 35 by the air flow and are collected by the filter pad 40.
  • the filter's efficiency improves by this arrangement because charged particles of dust are more readily captured by a filter pad 40, especially a polarized filter pad 40, than neutral particles.
  • This arrangement produces results even more favourable than those shown in the graph of Figure 13.
  • the improved results are shown in the graph of Figure 16. While two fibrous pads have been shown throughout as embracing the high voltage grid, only one is essentially required. Two pads are preferred to cover the high voltage grid and prevent inadvertent contact.
  • the symmetrical two pad format also protects the contained ionizing grid when the invention is applied in its preferred, replaceable cartridge with ionizing string format.

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

Abstract

Un filtre à air électronique de rendement élevé est constitué d'un matelas fibreux de fibres diélectriques sandwiché entre une grille ionisante chargée électriquement et un écran mis à la terre. La grille ionisante charge les particules de poussière traversant le filtre alors que, simultanément, la grille et l'écran polarisent le matelas fibreux. Les particules chargées sont, de la sorte, attirées et rassemblées sur le matelas fibreux polarisé et ce, avec un rendement amélioré.
PCT/CA1996/000730 1995-01-17 1996-11-08 Filtre a air electronique ionisant et polarisant WO1998020978A1 (fr)

Priority Applications (13)

Application Number Priority Date Filing Date Title
CA002270976A CA2270976C (fr) 1996-11-08 1996-11-08 Filtre a air electronique ionisant et polarisant
DE69621163T DE69621163D1 (de) 1996-11-08 1996-11-08 Ionisierende und polarisierende elektronische luftfilter
JP52196698A JP2001503326A (ja) 1996-11-08 1996-11-08 電子エアーフィルターのためのイオン化装置
AU72747/96A AU713501C (en) 1996-11-08 1996-11-08 Ionizing apparatus for an electronic air filter
EP96934280A EP0936946B1 (fr) 1996-11-08 1996-11-08 Filtre a air electronique ionisant et polarisant
PCT/CA1996/000730 WO1998020978A1 (fr) 1996-11-08 1996-11-08 Filtre a air electronique ionisant et polarisant
US08/876,369 US6077334A (en) 1995-01-17 1997-06-16 Externally ionizing air filter
AU49373/97A AU4937397A (en) 1996-11-08 1997-11-07 Externally ionizing air filter
EP97911985A EP0936947B1 (fr) 1996-11-08 1997-11-07 Filtre a air a fonction ionisante vers l'exterieur
CA002270979A CA2270979C (fr) 1996-11-08 1997-11-07 Filtre a air a fonction ionisante vers l'exterieur
PCT/CA1997/000833 WO1998020979A1 (fr) 1996-11-08 1997-11-07 Filtre a air a fonction ionisante vers l'exterieur
DE69712508T DE69712508D1 (de) 1996-11-08 1997-11-07 Nach aussen ionisierende luftfilter
NO992249A NO992249L (no) 1996-11-08 1999-05-07 Ioniserende apparat for et elektronisk luftfilter

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

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
US08/373,072 Continuation-In-Part US5573577A (en) 1995-01-17 1995-01-17 Ionizing and polarizing electronic air filter

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US08/876,369 Continuation-In-Part US6077334A (en) 1995-01-17 1997-06-16 Externally ionizing air filter

Publications (1)

Publication Number Publication Date
WO1998020978A1 true WO1998020978A1 (fr) 1998-05-22

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ID=4173178

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CA1996/000730 WO1998020978A1 (fr) 1995-01-17 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)

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WO2008034605A1 (fr) * 2006-09-22 2008-03-27 Langner Manfred H dispositif d'ionisation pour installations de filtration d'air
WO2016081680A1 (fr) 2014-11-20 2016-05-26 Environmental Management Confederation, Inc. Connexion haute tension pour matériau épars
CN109805000A (zh) * 2019-03-29 2019-05-28 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
RU201474U1 (ru) * 2020-07-30 2020-12-16 Александр Георгиевич Железнов Антивирусное электронное устройство
WO2021226639A3 (fr) * 2020-05-05 2021-12-23 Seegers Graham Neville Ensemble pour attirer et neutraliser des contaminants de l'air
DE102021132295A1 (de) 2021-12-08 2023-06-15 RL-Raumlufttechnik und Raumluftqualität Gesellschaft mit beschränkter Haftung Vorrichtung zum Filtern eines mit Partikeln verunreinigten Luftstroms

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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
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
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

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FR2124215A1 (fr) * 1971-02-09 1972-09-22 Soltis Charles
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
DE3634538A1 (de) * 1986-10-10 1988-04-14 Hoelter Heinz Verfahren und vorrichtung zur partikeleinbindung in elektrofilter
GB2265556A (en) * 1992-03-10 1993-10-06 Robert William Gibbs An electrostatic filter device
EP0585054A1 (fr) * 1992-08-20 1994-03-02 Colt International Holdings A.G. Filtre d'air électrostatique
US5573577A (en) * 1995-01-17 1996-11-12 Joannou; Constantinos J. Ionizing and polarizing electronic air filter

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Publication number Priority date Publication date Assignee Title
FR2124215A1 (fr) * 1971-02-09 1972-09-22 Soltis Charles
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
DE3634538A1 (de) * 1986-10-10 1988-04-14 Hoelter Heinz Verfahren und vorrichtung zur partikeleinbindung in elektrofilter
GB2265556A (en) * 1992-03-10 1993-10-06 Robert William Gibbs An electrostatic filter device
EP0585054A1 (fr) * 1992-08-20 1994-03-02 Colt International Holdings A.G. Filtre d'air électrostatique
US5573577A (en) * 1995-01-17 1996-11-12 Joannou; Constantinos J. Ionizing and polarizing electronic air filter

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EP0936946B1 (fr) 2002-05-08
JP2001503326A (ja) 2001-03-13
DE69621163D1 (de) 2002-06-13
CA2270976C (fr) 2003-04-29
EP0936946A1 (fr) 1999-08-25
CA2270976A1 (fr) 1998-05-22

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