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EP0229857A1 - Filtre d'air électrostatique - Google Patents

Filtre d'air électrostatique Download PDF

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Publication number
EP0229857A1
EP0229857A1 EP85307976A EP85307976A EP0229857A1 EP 0229857 A1 EP0229857 A1 EP 0229857A1 EP 85307976 A EP85307976 A EP 85307976A EP 85307976 A EP85307976 A EP 85307976A EP 0229857 A1 EP0229857 A1 EP 0229857A1
Authority
EP
European Patent Office
Prior art keywords
high voltage
filter according
filter
outside
frames
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Withdrawn
Application number
EP85307976A
Other languages
German (de)
English (en)
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.)
Engineering Dynamics Ltd
Original Assignee
Engineering Dynamics Ltd
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 Engineering Dynamics Ltd filed Critical Engineering Dynamics Ltd
Priority to EP85307976A priority Critical patent/EP0229857A1/fr
Publication of EP0229857A1 publication Critical patent/EP0229857A1/fr
Withdrawn legal-status Critical Current

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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
    • B03C3/72—Emergency control systems
    • 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
    • B03C3/32—Transportable units, e.g. for cleaning room air

Definitions

  • the invention relates to electronic air filters in which dust is collected on a charged medium or screen.
  • a filter can well be installed in a furnace or air conditioner, for example.
  • Patent Specification CA 1175754 discloses a filter of this kind comprising outside frame supporting screens attached to each other by hinges, an inside frame supporting a third metallic screen, a high voltage supply unit attached to one of the outside frames, and removable fibrous pads between the screens.
  • the outside frames comprise hollow members held together by fitting rigid right angled corner members therein. This makes it possible to construct frames of various size from standard components without a change of tooling.
  • a metal box 5 contains high voltage power supply electronic components as shown in Figure 6.
  • Latches 6 and 7 hold the frames 1, 2 together in a closed position at one side while metal hinges (not shown) secure the frames together at the opposite side.
  • an electrical socket 8 and plug 9 connect a low voltage cable 10 to a low voltage power supply 11 having prongs 12 which can be plugged into a conventional mains outlet.
  • the socket 8 is connected inside the box 5 to the high voltage supply components.
  • An inside screen 13 ( Figure 1) is supported on a centre frame 14. Insulators 22 are attached to the corners of the frame 14 to centre it and the screen 13 between the screens 3, 4. Strips 15 of flexible insulating material function as hinges and attach the centre frame 14 to the outside frame 2.
  • Fibrous pads 16 function as dust collection medium.
  • the pads 16 are made of high quality insulating material such as glass fibre. They are located between the screens 3, 4 and the screen 13 which is attached to an output 18 of the high voltage supply box 5.
  • a cylindrical metallic terminal 19 ( Figures 4, 5) is attached to an end of an electrode 17 to increase the diameter of the electrode 17 and prevent high voltage corona.
  • a flexible spring wire 20 is attached to the box 5 and has a cylindrical terminal 21 to prevent high voltage corona between the electrode 17 and the wire 20 which is at ground potential since it is attached to the box 5 and the frames 1, 2.
  • the spring wire 20 is shaped in such a way that when frames 1, 2 are closed together, the wire 20 is pushed by the frame 1 away from the electrode 17. When the frames 1, 2 are slightly separated, the wire 20 springs back, and the terminal 21 touches the terminal 19 and connects the electrode 17 to ground. When the filter is closed and frames 1, 2 are together, the centre frame 14 comes into contact with the terminal 19 and thus high voltage is applied to the screen 13.
  • the outside frames 1,2 comprise hollow members 1A which are held together by fitting rigid corner members 23 ( Figure 3) therein.
  • the members 1A have grooves 25 in which the screens 3 and 4 are fixed by squeezing the edges of the screens into the grooves 25 with a resilient cord 24. (See also Figures 4, 5).
  • filters of different size can be manufactured by simply cutting appropriate lengths for members 1A.
  • the voltage supply outlet 18 is long and slender so as to fit at the end of the filter and be part of the unit (see Figure 6).
  • the electronic part of the power supply in Figure 6 consists of an electronic oscillator A which drives a transformer B.
  • the transformer B produces about one tenth of the output high voltage.
  • a voltage multiplier C boosts the output of the transformer B to the final high voltage required.
  • the arrangement has high impedance to prevent excessive current flow under high humidity conditions.
  • the voltage is gradually built up to the high voltage required to drive the filter.
  • the supply box 5 contains a long, narrow printed circuit board.
  • Low voltage power supply 11 is plugged into a mains outlet via the prongs 12 and provides low voltage such as 9V to the high voltage power supply via the cable 10, plug 9 and socket 8.
  • the high voltage power supply transforms this low voltage to high voltage such as 6 kilovolts, and this is connected to the screen 13 via the electrode 17, terminal 19 and centre frame 14.
  • the return connection of the high voltage power supply is through the box 5.
  • This provides a high voltage potential between the screen 13 and the outside screens 1, and 2. This potential polarizes the fibrous pads 16 and thus positive and negative electric charges form at the surfaces of each fibre. Dust particles passing between the screens also become polarized and are attracted to the fibres.

Landscapes

  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Electrostatic Separation (AREA)
EP85307976A 1985-11-04 1985-11-04 Filtre d'air électrostatique Withdrawn EP0229857A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP85307976A EP0229857A1 (fr) 1985-11-04 1985-11-04 Filtre d'air électrostatique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP85307976A EP0229857A1 (fr) 1985-11-04 1985-11-04 Filtre d'air électrostatique

Publications (1)

Publication Number Publication Date
EP0229857A1 true EP0229857A1 (fr) 1987-07-29

Family

ID=8194426

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85307976A Withdrawn EP0229857A1 (fr) 1985-11-04 1985-11-04 Filtre d'air électrostatique

Country Status (1)

Country Link
EP (1) EP0229857A1 (fr)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0337017A1 (fr) * 1985-11-13 1989-10-18 Constantinos J. Joannou Filtre d'air électrostatique à cassettes
EP0475493A2 (fr) * 1990-08-29 1992-03-18 C.H. De Jong B.V. Installation pour la purification de l'air
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
US8070861B2 (en) * 2005-12-29 2011-12-06 Environmental Management Confederation, Inc. Active field polarized media air cleaner
US8252097B2 (en) 2005-12-29 2012-08-28 Environmental Management Confederation, Inc. Distributed air cleaner system for enclosed electronic devices
US8252095B2 (en) 2005-12-29 2012-08-28 Environmental Management Confederation, Inc. Filter media for active field polarized media air cleaner
US8795601B2 (en) 2005-12-29 2014-08-05 Environmental Management Confederation, Inc. Filter media for active field polarized media air cleaner
US8814994B2 (en) 2005-12-29 2014-08-26 Environmental Management Confederation, Inc. Active field polarized media air cleaner
US9789494B2 (en) 2005-12-29 2017-10-17 Environmental Management Confederation, Inc. Active field polarized media air cleaner
US11452960B2 (en) 2015-04-14 2022-09-27 Environmental Management Confederation, Inc. Corrugated filtration media for polarizing air cleaner

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3073094A (en) * 1960-05-23 1963-01-15 Trion Inc Electrostatic filter panel
US3509696A (en) * 1967-10-18 1970-05-05 Carrier Corp Collector assembly for electrostatic air precipitators
DE2028153A1 (en) * 1970-04-02 1971-10-14 Inst Za Aerodinamicka I Termod Electronic air filter
CA1175754A (fr) * 1983-01-04 1984-10-09 Constantinos J. Joannou Filtre d'air electronique

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3073094A (en) * 1960-05-23 1963-01-15 Trion Inc Electrostatic filter panel
US3509696A (en) * 1967-10-18 1970-05-05 Carrier Corp Collector assembly for electrostatic air precipitators
DE2028153A1 (en) * 1970-04-02 1971-10-14 Inst Za Aerodinamicka I Termod Electronic air filter
CA1175754A (fr) * 1983-01-04 1984-10-09 Constantinos J. Joannou Filtre d'air electronique

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0337017A1 (fr) * 1985-11-13 1989-10-18 Constantinos J. Joannou Filtre d'air électrostatique à cassettes
EP0475493A2 (fr) * 1990-08-29 1992-03-18 C.H. De Jong B.V. Installation pour la purification de l'air
EP0475493A3 (en) * 1990-08-29 1992-04-29 C.H. De Jong B.V. System for purifying air
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
US8070861B2 (en) * 2005-12-29 2011-12-06 Environmental Management Confederation, Inc. Active field polarized media air cleaner
US8252097B2 (en) 2005-12-29 2012-08-28 Environmental Management Confederation, Inc. Distributed air cleaner system for enclosed electronic devices
US8252095B2 (en) 2005-12-29 2012-08-28 Environmental Management Confederation, Inc. Filter media for active field polarized media air cleaner
US8795601B2 (en) 2005-12-29 2014-08-05 Environmental Management Confederation, Inc. Filter media for active field polarized media air cleaner
US8814994B2 (en) 2005-12-29 2014-08-26 Environmental Management Confederation, Inc. Active field polarized media air cleaner
US9764331B2 (en) 2005-12-29 2017-09-19 Environmental Management Confederation, Inc. Filter media for active field polarized media air cleaner
US9789494B2 (en) 2005-12-29 2017-10-17 Environmental Management Confederation, Inc. Active field polarized media air cleaner
US11007537B2 (en) 2005-12-29 2021-05-18 Environmental Management Confederation, Inc. Filter media for active field polarized media air cleaner
US11452960B2 (en) 2015-04-14 2022-09-27 Environmental Management Confederation, Inc. Corrugated filtration media for polarizing air cleaner

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Inventor name: JOANNOU, CONSTANTINOS J.