WO2008091942B1 - Method and device to prevent dust agglomeration on corona electrodes - Google Patents

Method and device to prevent dust agglomeration on corona electrodes

Info

Publication number
WO2008091942B1
WO2008091942B1 PCT/US2008/051790 US2008051790W WO2008091942B1 WO 2008091942 B1 WO2008091942 B1 WO 2008091942B1 US 2008051790 W US2008051790 W US 2008051790W WO 2008091942 B1 WO2008091942 B1 WO 2008091942B1
Authority
WO
WIPO (PCT)
Prior art keywords
shroud
gas flow
electrode
dust
electrostatic discharge
Prior art date
Application number
PCT/US2008/051790
Other languages
French (fr)
Other versions
WO2008091942A3 (en
WO2008091942A2 (en
Inventor
Daniel Jon Schlitz
Original Assignee
Thorrn Micro Technologies Inc
Daniel Jon Schlitz
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 Thorrn Micro Technologies Inc, Daniel Jon Schlitz filed Critical Thorrn Micro Technologies Inc
Priority to CN200880006931A priority Critical patent/CN101622073A/en
Priority to EP08728129A priority patent/EP2109506A2/en
Priority to KR1020097017460A priority patent/KR20090114407A/en
Priority to JP2009547398A priority patent/JP2010516459A/en
Publication of WO2008091942A2 publication Critical patent/WO2008091942A2/en
Publication of WO2008091942A3 publication Critical patent/WO2008091942A3/en
Publication of WO2008091942B1 publication Critical patent/WO2008091942B1/en

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
    • B03C3/40—Electrode constructions
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/02—Apparatus for electrographic processes using a charge pattern for laying down a uniform charge, e.g. for sensitising; Corona discharge devices
    • G03G15/0258—Apparatus for electrographic processes using a charge pattern for laying down a uniform charge, e.g. for sensitising; Corona discharge devices provided with means for the maintenance of the charging apparatus, e.g. cleaning devices, ozone removing devices G03G15/0225, G03G15/0291 takes precedence
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J19/08—Processes employing the direct application of electric or wave energy, or particle radiation; Apparatus therefor
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/02—Apparatus for electrographic processes using a charge pattern for laying down a uniform charge, e.g. for sensitising; Corona discharge devices
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/02—Apparatus for electrographic processes using a charge pattern for laying down a uniform charge, e.g. for sensitising; Corona discharge devices
    • G03G15/0291—Apparatus for electrographic processes using a charge pattern for laying down a uniform charge, e.g. for sensitising; Corona discharge devices corona discharge devices, e.g. wires, pointed electrodes, means for cleaning the corona discharge device
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/02—Arrangements for laying down a uniform charge
    • G03G2215/026—Arrangements for laying down a uniform charge by coronas
    • G03G2215/027—Arrangements for laying down a uniform charge by coronas using wires

Abstract

The present invention is related to preventing dust agglomeration on a sharp electrode which is used for generating corona. According to certain aspects, the invention includes a dust shroud which decreases or prevents dust accumulation on the sharp electrodes. The dust shroud changes the gas flow path so as to reduce the amount of gas passing near the sharp electrode. An advantage of the shroud is that it prevents dust from building up on the electrodes. The shroud is a simple, passive addition to the electrostatic pump, such that the pump is otherwise able to operate normally throughout its life. In embodiments, the shroud can be used to protect a corona electrode used in heat sink applications especially in electronics cooling. It can also be used in electrostatic precipitators for cleaning dust or chemical or microbe particles from air.

Claims

AMENDED CLAIMS received by the International Bureau on 08 September 200 (08.09.08)
1. (Currently Amended) A device for decreasing or preventing dust accumulation in an electrostatic discharge element, the element creating an electrohydrodynamic gas flow in correspondence with the electrostatic discharge, the device comprising: a dust shroud disposed adjacent to a sharp electrode of the electrostatic discharge element in an upstream location from the sharp electrode with respect to a direction of the gas flow created by the electrostatic discharge element so as to thereby block dust carried by the gas flow from impinging on the sharp electrode.
2. A device according to claim 1, wherein the dust shroud changes the gas flow so as to reduce the amount of gas passing near the sharp electrode.
3. A device according to claim 2, wherein the shroud includes a cavity that partially surrounds the sharp electrode.
4. A device according to claim 2, wherein the shroud is offset from the sharp electrode in the direction of the gas flow.
5. A device according to claim 2, wherein the shroud is in contact with the sharp electrode.
6. A device according to claim 2, wherein the shroud has a first portion with a larger width than a width of the sharp electrode with respect to the direction of the gas flow.
7. A device according to claim 6, wherein the shroud has a second portion with a smaller width than the first portion, the second portion being located upstream from the first portion with respect to the direction of the gas flow.
8. (Currently Amended) A method for decreasing or preventing dust accumulation in an electrostatic discharge element, the element creating an electrohydrodynamic gas flow in correspondence with the electrostatic discharge, the method comprising: disposing a dust shroud adjacent to a sharp electrode of the electrostatic discharge element in an upstream location from the sharp electrode with respect to a direction of the gas flow created by the electrostatic discharge element so as to thereby block dust carried by the gas flow from impinging on the sharp electrode.
9. A method according to claim 8, further comprising: configuring the dust shroud to change the gas flow so as to reduce the amount of gas passing near the sharp electrode.
10. A method according to claim 9, further comprising: providing a cavity in the shroud that partially surrounds the sharp electrode.
11. A method according to claim 9, wherein the disposing step includes providing an offset between the sharp electrode and the shroud in the direction of the gas flow.
12. A method according to claim 9, wherein the disposing step includes providing contact between the sharp electrode and the shroud.
13. A method according to claim 9, wherein the configuring step includes configuring the shroud to have a first portion with a larger width than a width of the sharp electrode with respect to the direction of the gas flow.
14. A method according to claim 13, wherein the configuring step further includes configuring the shroud with a second portion having a smaller width than the first portion, the second portion being located upstream from the first portion with respect to the direction of the gas flow.
15. (Currently Amended) A device comprising: an electrostatic discharge element including a corona electrode for creating an electrohydrodynamic gas flow in correspondence with an electrostatic discharge; and a dust shroud disposed upstream from the corona electrode of the electrostatic discharge element with respect to a direction of the gas flow created by the electrostatic discharge element so as to thereby block dust carried by the gas flow from impinging on the sharp electrode, wherein the corona electrode has a cross-section of less than 100 μm.
16. A device according to claim 15, wherein the corona electrode comprises a wire.
17. A device according to claim 16, wherein the dust shroud comprises a dielectric material.
18. A device according to claim 15, wherein the dust shroud is offset about 10 to 200 μm from the corona electrode.
19. A device according to claim 15, wherein a width of shroud is less than 5 times that of the corona electrode cross-section.
PCT/US2008/051790 2007-01-24 2008-01-23 Method and device to prevent dust agglomeration on corona electrodes WO2008091942A2 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
CN200880006931A CN101622073A (en) 2007-01-24 2008-01-23 Method and device to prevent dust agglomeration on corona electrodes
EP08728129A EP2109506A2 (en) 2007-01-24 2008-01-23 Method and device to prevent dust agglomeration on corona electrodes
KR1020097017460A KR20090114407A (en) 2007-01-24 2008-01-23 Method and device to prevent dust agglomeration on corona electrodes
JP2009547398A JP2010516459A (en) 2007-01-24 2008-01-23 Method and apparatus for preventing dust agglomeration at a corona electrode

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US88649707P 2007-01-24 2007-01-24
US60/886,497 2007-01-24

Publications (3)

Publication Number Publication Date
WO2008091942A2 WO2008091942A2 (en) 2008-07-31
WO2008091942A3 WO2008091942A3 (en) 2008-09-25
WO2008091942B1 true WO2008091942B1 (en) 2008-11-20

Family

ID=39645146

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2008/051790 WO2008091942A2 (en) 2007-01-24 2008-01-23 Method and device to prevent dust agglomeration on corona electrodes

Country Status (7)

Country Link
US (1) US7822355B2 (en)
EP (1) EP2109506A2 (en)
JP (1) JP2010516459A (en)
KR (1) KR20090114407A (en)
CN (1) CN101622073A (en)
TW (1) TW200838625A (en)
WO (1) WO2008091942A2 (en)

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US9380689B2 (en) 2008-06-18 2016-06-28 Illinois Tool Works Inc. Silicon based charge neutralization systems
US20090316325A1 (en) * 2008-06-18 2009-12-24 Mks Instruments Silicon emitters for ionizers with high frequency waveforms
US8466624B2 (en) * 2008-09-03 2013-06-18 Tessera, Inc. Electrohydrodynamic fluid accelerator device with collector electrode exhibiting curved leading edge profile
JP5230681B2 (en) * 2010-04-22 2013-07-10 シャープ株式会社 Charging device and image forming apparatus
US20120000486A1 (en) * 2010-06-30 2012-01-05 Tessera, Inc. Emitter wire cleaning device with wear-tolerant profile
JP5691470B2 (en) * 2010-12-10 2015-04-01 カルソニックカンセイ株式会社 Blower for vehicle
JP5825062B2 (en) * 2011-02-28 2015-12-02 ブラザー工業株式会社 Image forming apparatus
US8492733B1 (en) * 2012-01-06 2013-07-23 Illinois Tool Works Inc. Multi-sectional linear ionizing bar and ionization cell
US9125284B2 (en) 2012-02-06 2015-09-01 Illinois Tool Works Inc. Automatically balanced micro-pulsed ionizing blower
USD743017S1 (en) 2012-02-06 2015-11-10 Illinois Tool Works Inc. Linear ionizing bar
US9918374B2 (en) 2012-02-06 2018-03-13 Illinois Tool Works Inc. Control system of a balanced micro-pulsed ionizer blower
US9167676B2 (en) 2014-02-28 2015-10-20 Illinois Toolworks Inc. Linear ionizing bar with configurable nozzles
US9661725B2 (en) 2014-05-20 2017-05-23 Illinois Tool Works Inc. Wire electrode cleaning in ionizing blowers
US9610589B2 (en) 2015-05-21 2017-04-04 Savannah River Nuclear Solutions, Llc Electrostatic particle collector with improved features for installing and/or removing its collector plates
JP2017009953A (en) * 2015-06-26 2017-01-12 キヤノン株式会社 Image forming apparatus
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Also Published As

Publication number Publication date
TW200838625A (en) 2008-10-01
CN101622073A (en) 2010-01-06
EP2109506A2 (en) 2009-10-21
US20080199208A1 (en) 2008-08-21
KR20090114407A (en) 2009-11-03
US7822355B2 (en) 2010-10-26
WO2008091942A3 (en) 2008-09-25
WO2008091942A2 (en) 2008-07-31
JP2010516459A (en) 2010-05-20

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