EP1981611A2 - Conductive bead for active field polarized media air cleaner - Google Patents
Conductive bead for active field polarized media air cleanerInfo
- Publication number
- EP1981611A2 EP1981611A2 EP06840366A EP06840366A EP1981611A2 EP 1981611 A2 EP1981611 A2 EP 1981611A2 EP 06840366 A EP06840366 A EP 06840366A EP 06840366 A EP06840366 A EP 06840366A EP 1981611 A2 EP1981611 A2 EP 1981611A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- filter
- media
- conductive
- filter media
- pleated
- 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.)
- Withdrawn
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
- B03C3/02—Plant or installations having external electricity supply
- B03C3/04—Plant or installations having external electricity supply dry type
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
- B01D39/10—Filter screens essentially made of metal
- B01D39/12—Filter screens essentially made of metal of wire gauze; of knitted wire; of expanded metal
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
- B01D39/14—Other self-supporting filtering material ; Other filtering material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/0027—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions
- B01D46/0032—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions using electrostatic forces to remove particles, e.g. electret filters
-
- 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
- B03C3/28—Plant or installations without electricity supply, e.g. using electrets
- B03C3/30—Plant or installations without electricity supply, e.g. using electrets in which electrostatic charge is generated by passage of the gases, i.e. tribo-electricity
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
- B01D2239/02—Types of fibres, filaments or particles, self-supporting or supported materials
- B01D2239/0241—Types of fibres, filaments or particles, self-supporting or supported materials comprising electrically conductive fibres or particles
Definitions
- the present invention relates generally to air cleaning systems and is particularly directed to air cleaners of the type that use an electrostatic field to polarize a media and to polarize particles to increase the particle collection efficiency on the media.
- electrostatic attraction has been used for many years to enhance the removal of contaminants from air streams.
- air electrostatic cleaners There are three primary categories of air electrostatic cleaners: electrostatic precipitators, passive electrostatic filters and active field polarized media air cleaners, which are sometimes known under different terms.
- Electrostatic precipitators charge particles and then capture them on oppositely charged and/or grounded collection plates.
- a passive electrostatic filter (also known as an clcctrct) employs a media (or combination of different media) that through some combination of treatment and/or inherent properties has an electrostatic charge. Particles entering the filter media that have an electrostatic charge are attracted to the charged media filter materials that have the opposite electrostatic charge.
- An active field polarized media air cleaner uses an electrostatic field created by a voltage differential between two electrodes. A dielectric filter media is placed in the electrostatic field between the two electrodes. The electrostatic field polarizes both the media fibers and the particles that enter, thereby increasing the efficiency of the media and the air cleaner.
- a dielectric material is an electrical insulator or a substance that is highly resistant to electric current that can also store electrical energy. A dielectric material tends to concentrate an applied electric field within itself and is thus an efficient supporter of electrostatic fields.
- a further electrostatic air filter design is disclosed in Canadian Patent No. 1,272,453, in which a disposable rectangular cartridge is connected to a high voltage power supply.
- the cartridge consists of a conductive inner center screen, which is sandwiched between two layers of a dielectric fibrous material (either plastic or glass).
- the two dielectric layers are, in turn, further sandwiched between two outer screens of conductive material.
- the conductive inner center screen is raised to a high voltage, thereby creating an electrostatic field between the inner center screen and the two conductive outer screens that are kept at an opposite or ground potential.
- the high voltage electrostatic field polarizes the fibers of the two dielectric layers.
- Pleated filters arc also well known.
- a pleated filter is formed from a sheet of filter media folded into a series of pleats.
- One type of pleated filter known as a mini-pleat filter, has smaller more closely spaced pleats.
- the peaks between adjacent pleats of a mini-pleat filter are spaced no more than 20 mm apart and typically range from 5.0 mm to 7.0 mm apart.
- Mini-pleat air filters typically utilize 7/8 to 1 1/4 inch deep pleats with very narrow air spaces (1/8 inch) between, making it possible to pack more filter paper into a standard frame than can be done with traditional deep, corrugated pleats.
- Mini-pleat filters contain almost twice as much filter paper as deeply pleated filters or corrugated separator filters of equal frame size.
- the present invention is embodied in a filter media in which conductive beads arc used to support and/or hold together the media and generate an electrostatic field within the media.
- the present invention is further embodied in a pleated filter media in which conductive beads or members are used to support the media, space the pleated surfaces apart, add -A-
- an electrostatic field is created within the media by applying a high voltage differential between adjacent conductive beads, thereby increasing the efficiency of the filter.
- Figure 1 is a mini-pleat filter containing conductive beads in accordance with the present invention.
- Figure 2A is an isometric drawing, partially in schematic form, of a mini-pleat filter containing conductive beads in accordance with the present invention.
- Figure 2B is an isometric drawing, partially in schematic form, of a non-pleated filter containing conductive beads in accordance with the present invention.
- Figure 3 is a cross-sectional view of the filter media and conductive beads of the filter shown in figure 2B in accordance with the present invention.
- Figure 4 illustrates a first embodiment for applying an electrostatic field to a filter media in accordance with the present invention.
- Figure 5 illustrates a second embodiment for applying an electrostatic field to a filter media in accordance with the present invention.
- Figure 6 illustrates a third embodiment for applying an electrostatic field to a filter media in accordance with the present invention.
- Figure 7 is a cross-sectional view of the filter media and conductive beads of the filter shown in figure 2A in accordance with the present invention.
- a pleated filter 10 shown in figure 1 includes a rigid frame 12 of typically plastic or metal that encloses pleated filter material 14.
- the filter illustrated is a mini-pleat filter with parallel conductive beads holding the pleats of the mini-pleat filter in place.
- substantially parallel conductive beads 16 and 18 are illustrated in figure 1.
- pleated filter media 14 is held in place by a top conductive bead 16A and a bottom conductive bead 16B that arc respectively above and below the pleated filter media 14.
- Parallel to conductive beads 16A and 16B is an adjacent pair of rows of conductive beads, namely top conductive bead 18A and bottom conducted bead 18B.
- parallel rows of conductive beads are spaced one half to three quarters of an inch apart on each side of the filter media 14.
- a cross-sectional view of the filter media and conductive beads from figure 2A is shown in figure 7.
- the filter media 14 is sandwiched between the top and bottom conductive beads 16A and 16B. Specifically, the filter media 14 is held in place by the top conductive bead 16A. Additionally, the filter media 14 is held in place by the bottom conductive bead 16B.
- one terminal of a high voltage power supply 108 is coupled to conductive beads 16A and 16B on the top of the media filter 14.
- the other terminal of the high voltage power supply 108 is coupled to conductive beads 18A and 18B on the bottom of the media filter 14.
- the high voltage applied to the conductive beads provides for an electrostatic field ranging from 3-30 kv/cm in the filter material 14.
- the spacing between conductive beads and the voltage applied thereto may be selected appropriately so as to generate the desired field strength for the particular filter media. It has been found that when conductive beads were applied to a nominal MERV 11 pleated media and an electrostatic field was established, filter efficiency at 0.3-micron particle size went from 31% to 59% (a 90% increase).
- Conductive beads of the present invention may also be applied to filters of different form factors such as a bag or stock filter. Furthermore, the conductive beads of the present invention may also be applied to filters of different filter media.
- the filter media 14 can be composed the fibers from different portions of the triboelectric scale (electret). The filter media 14 may be essentially of one filter material or layers of different filter materials.
- bead means any material such as glue, thread, ribbon, tape, strips, or continuous piece of glass, foam, metal or plastic or any other material that adheres to the surface of the filter media or is made to adhere to the surface of the filter media upon which it rests and provides some mechanical support to such filter media.
- FIG. 2B and figure 3 provide an illustration of the use of conductive beads of the present invention in substantially flat filter media 20.
- a top conductive bead 22A and a bottom conductive bead 22B that are above and below the flat filter media 20 support flat filter media 20.
- Parallel to conductive beads 22A and 22B is an adjacent pair of rows of conductive beads, namely a top conductive bead 24A and a bottom conductive bead 24B that also support flat filter media 20.
- One terminal of a high voltage power supply 108 is coupled to conductive beads 22A and 22B on the top of the media filter 20.
- the other terminal of the high voltage power supply 108 is coupled to conductive beads 24A and 24B on the bottom of the media filter 20.
- FIG. 5 Alternate ways of connecting the high voltage power supply 108 to the conductive beads on top and bottom of the filter media are shown in figures 5 and 6.
- one terminal of the high voltage power supply 108 is connected to a first conductive bead 16B below the filter media 14.
- the other terminal of the high voltage power supply 108 is connected to a second conductive bead 18A above the filter media 14.
- Applying a high voltage potential to conductors on alternate sides of the filter media 14 forces the electrostatic field to pass through the filter media 14 and may provide a stronger electrostatic field within the interior of the filter media 14.
- the one terminal of the high voltage power supply 108 is connected to a first conductive bead 16A.
- the other terminal of the high voltage power supply 108 is connected to a second conductive bead 18 A, which is on the same side of the filter media 14 as the first conductive bead 16A. Applying a high voltage potential to conductors on the same side of filter media 14 may provide easier connections to the power supply 108.
- one terminal of the high voltage power supply 108 could be connected to conductors on top and bottom of filter media 14 and the other terminal of the high voltage power supply 108 connected to a single conductor, either on top or on bottom of filter media 14.
- conductive beads of present invention could be applied to either flat or pleated media, it is particularly advantageous as an integral part of the mini-pleat filter configuration with conductive glue beads.
- the invention(s) disclosed above could be used in variety of ways, including, but not limited to, use in HVAC systems, self-contained filter/fan units, and industrial air cleaning systems, and dust collectors. While the above embodiments primarily describe flat filter configurations, the inventions could be adapted to other configurations as well: including but not limited to V-bank groupings of multiple flat panels, interconnected groupings of panel and V-Bank units, cylindrical filters for dust collection systems, etc. Further, any and all of these could be coupled with ionizing or polarizing arrays upstream or downstream of the device to improve efficiency.
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US75477105P | 2005-12-29 | 2005-12-29 | |
US75480505P | 2005-12-29 | 2005-12-29 | |
PCT/US2006/062765 WO2007076553A2 (en) | 2005-12-29 | 2006-12-29 | Conductive bead for active field polarized media air cleaner |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1981611A2 true EP1981611A2 (en) | 2008-10-22 |
EP1981611A4 EP1981611A4 (en) | 2012-04-25 |
Family
ID=38218897
Family Applications (3)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06846879.2A Active EP1993735B1 (en) | 2005-12-29 | 2006-12-29 | Improved active field polarized media air cleaner |
EP06840365.8A Active EP1981610B1 (en) | 2005-12-29 | 2006-12-29 | Improved filter media for active field polarized media air cleaner |
EP06840366A Withdrawn EP1981611A4 (en) | 2005-12-29 | 2006-12-29 | Conductive bead for active field polarized media air cleaner |
Family Applications Before (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06846879.2A Active EP1993735B1 (en) | 2005-12-29 | 2006-12-29 | Improved active field polarized media air cleaner |
EP06840365.8A Active EP1981610B1 (en) | 2005-12-29 | 2006-12-29 | Improved filter media for active field polarized media air cleaner |
Country Status (14)
Country | Link |
---|---|
EP (3) | EP1993735B1 (en) |
JP (5) | JP2009522498A (en) |
KR (11) | KR20140012775A (en) |
CN (4) | CN102500166B (en) |
AU (5) | AU2006330440B2 (en) |
CA (5) | CA2635729C (en) |
DK (2) | DK1981610T3 (en) |
ES (2) | ES2555660T3 (en) |
GB (1) | GB2446763B (en) |
HK (2) | HK1126711A1 (en) |
MX (4) | MX2008008463A (en) |
RU (3) | RU2386469C1 (en) |
SG (4) | SG175662A1 (en) |
WO (4) | WO2007076551A2 (en) |
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CN102489404B (en) * | 2011-12-13 | 2015-01-14 | 冯耀忠 | Electret polypropylene thermoplastic bar electrostatic precipitation filter |
WO2014082213A1 (en) * | 2012-11-28 | 2014-06-05 | Esd Technology Consulting & Licensing Co.,Ltd | Moist air controller and system for static charge reduction |
JP2014113532A (en) * | 2012-12-07 | 2014-06-26 | Nitto Denko Corp | Filter medium and method for producing filter medium |
JP2014198312A (en) * | 2013-03-29 | 2014-10-23 | 日東電工株式会社 | Filter medium and method of manufacturing filter medium |
CN105665135B (en) * | 2014-11-18 | 2019-01-08 | 华为技术有限公司 | Dust-extraction unit |
AU2015349900B2 (en) * | 2014-11-20 | 2018-11-29 | Environmental Management Confederation, Inc. | High voltage connection for sparse material |
KR102541787B1 (en) | 2015-04-14 | 2023-06-08 | 인바이런멘탈 메니지먼트 컨피더레이션, 인크. | Corrugated Filtration Media for Polarizing Air Purifiers |
CN107149981B (en) * | 2016-03-02 | 2019-02-22 | 北京纳米能源与系统研究所 | A kind of sports type rubs electric gas dust-removing device, dust pelletizing system and dust removal method |
KR102087722B1 (en) * | 2017-09-14 | 2020-04-24 | 한국기계연구원 | Filter module for fine dust removal and air cleaning system for fine dust removal |
CN109967256A (en) * | 2017-12-27 | 2019-07-05 | 宁波方太厨具有限公司 | A kind of microparticle collection device |
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KR102127839B1 (en) * | 2018-11-01 | 2020-06-29 | 엘지전자 주식회사 | Electric dust collector |
US11266939B2 (en) | 2018-12-11 | 2022-03-08 | Johnson Controls Technology Company | Adjustable filter assemblies for HVAC systems |
CN110227309A (en) * | 2019-05-17 | 2019-09-13 | 美埃(中国)环境净化有限公司 | A kind of interchangeable V-type air filter of filter core |
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KR102370630B1 (en) | 2019-11-18 | 2022-03-04 | 엘지전자 주식회사 | Air cleaning filter and air cleaning apparatus having this |
KR20220007358A (en) * | 2020-07-10 | 2022-01-18 | 엘지전자 주식회사 | Electric dust collector and manufacturing method the same |
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2006
- 2006-12-29 AU AU2006330440A patent/AU2006330440B2/en active Active
- 2006-12-29 CA CA2635729A patent/CA2635729C/en active Active
- 2006-12-29 CA CA2635648A patent/CA2635648C/en active Active
- 2006-12-29 JP JP2008548878A patent/JP2009522498A/en active Pending
- 2006-12-29 CA CA2635804A patent/CA2635804C/en active Active
- 2006-12-29 WO PCT/US2006/062763 patent/WO2007076551A2/en active Application Filing
- 2006-12-29 WO PCT/US2006/062764 patent/WO2007076552A2/en active Application Filing
- 2006-12-29 EP EP06846879.2A patent/EP1993735B1/en active Active
- 2006-12-29 WO PCT/US2006/062766 patent/WO2007076554A2/en active Application Filing
- 2006-12-29 KR KR1020147001075A patent/KR20140012775A/en active Search and Examination
- 2006-12-29 ES ES06846879.2T patent/ES2555660T3/en active Active
- 2006-12-29 KR KR1020087018748A patent/KR100991188B1/en active IP Right Grant
- 2006-12-29 KR KR1020167016917A patent/KR20160079915A/en active Search and Examination
- 2006-12-29 RU RU2008131285/15A patent/RU2386469C1/en active
- 2006-12-29 CA CA2635630A patent/CA2635630C/en active Active
- 2006-12-29 SG SG2011076916A patent/SG175662A1/en unknown
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DE3339828A1 (en) * | 1983-11-01 | 1985-05-09 | Delbag-Luftfilter Gmbh, 1000 Berlin | Electrostatically supported filter element consisting of fibre material, for the separation of particles from gaseous media |
GB2160447A (en) * | 1984-06-22 | 1985-12-24 | Midori Anzen Kogyo | Electrostatic filter dust collector |
WO2004028698A2 (en) * | 2001-04-04 | 2004-04-08 | Joannou Constantinos J | Self ionizing pleated air filter system |
US6514324B1 (en) * | 2001-08-10 | 2003-02-04 | Rick L. Chapman | High efficiency active electrostatic air filter and method of manufacture |
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