EP0332624B1 - An electrostatic precipitator for use in electrofilters - Google Patents
An electrostatic precipitator for use in electrofilters Download PDFInfo
- Publication number
- EP0332624B1 EP0332624B1 EP87907361A EP87907361A EP0332624B1 EP 0332624 B1 EP0332624 B1 EP 0332624B1 EP 87907361 A EP87907361 A EP 87907361A EP 87907361 A EP87907361 A EP 87907361A EP 0332624 B1 EP0332624 B1 EP 0332624B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- electrodes
- terminal
- voltage source
- electrically
- precipitator
- 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
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
- B03C3/66—Applications of electricity supply techniques
- B03C3/70—Applications of electricity supply techniques insulating in electric separators
-
- 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
- B03C3/66—Applications of electricity supply techniques
Definitions
- the present invention relates to an electrostatic precipitator for use in electrostatic filters, so-called electrofilters.
- an electrostatic precipitator comprises a multiple of electrode plates or electrode lamellae which are electrically conductive or semi-conductive and which are arranged in mutually spaced parallel relationship and alternatively connected electrically to a respective terminal of a d.c. voltage source, such as to produce a structural device similar to an air capacitor connected to both terminals of the d.c. voltage source.
- An electrostatic precipitator of this kind is placed in the air flow passage or duct of an electrofilter in a manner such that the electrode plates or lamellae extend transversely across the air duct or air-flow passage in which the filter is placed, with the side surfaces of said plate electrodes parallel with the direction of air flow through the duct.
- the air flow to be cleansed of aerosol contaminants present in the form of solid particles or liquid droplets is driven through the air-flow duct, and therewith through the precipitator, by means of a blower or fan, natural ventilation, forced draught, or with the aid of an electric ion wind (c.f. International Patent Application PCT/SE85/00538, which corresponds to EP-A-0264363).
- the electrofilter incorporates upstream of the electrostatic precipitator means for electrically charging the aerosol contaminants present in the air flow in some suitable known manner, e.g. by means of a corona discharge which generates air ions.
- the purpose of the electrostatic precipitator is therewith to bring the electrically charged contaminants in the air flow passing through the precipitator, between the various plate electrodes thereof, under the influence of the electric field which is generated between adjacent electrodes and which extends essentially at right angles to the direction of air flow, such that the contaminants will migrate to one or the other of said electrodes, depending on the electrical polarity of the contaminants, and fasten on said electrodes, therewith cleansing the air flow from said contaminants.
- an electrostatic precipitator will present a significant capacitance. Consequently, a powerful capacitive discharge current will be released, if the electrodes of the precipitator are touched unintentionally. This current is highly unpleasant and may even be dangerous. Consequently, when electrofilters of this kind are to be used in a human environment, e.g. in domestic environments or working environments, it must be ensured that the electrostatic precipitator cannot be touched unintentionally. This often places on the construction of the electrofilter demands which conflict with other structural desiderata, such as small dimensions, low air-flow resistance, etc.
- the aforementioned highly resistive material conveniently consists of a plastic which is highly resistive, so-called antistatic plastic or a plastic treated to become antistatic, for example a plastic material of the kind used to package semi-conductor components so that said components are protected against the effect of electrostatic voltages.
- anti-static, or anti-static treated, plastic materials are available commercially and normally have a surface resistivity of from 109-1015 ⁇ , normally in the order of 1013 ⁇ .
- this connection of the precipitation electrodes 1, 2 to a respective one of the two terminals of the voltage source 3 is achieved by bringing one side-edge surface of a respective electrode, or at least parts of said one side-edge surface, into pressure contact with one side of a respective sheet-like or strip-like member 4 or 5 which is made of a highly resistive material, such as a so-called antistatic plastic, or a plastic which has been made antistatic.
- a highly resistive material such as a so-called antistatic plastic, or a plastic which has been made antistatic.
- antistatic, or antistatic treated materials are well known per se and are used, inter alia, to wrap semi-conductor components so as to protect the same against electrostatic voltages during the transportation and storage of such components.
- plastic materials have a surface resistivity of from 109-1015 ⁇ normally of the order of 1013 ⁇ .
- the antistatic material sold by MAGNAB, Nyköping, Sweden under the designation MPAC has been found extremely suitable to the requirements of the present invention.
- the plastic members 4, 5 may have a thickness of e.g. 1-5 mm, and will be slightly resilient or elastic, such as to enable the side edges of the electrodes 1, 2 to be held in firm abutment with one side surface of respective plastic members, with the aid of a suitably adapted pressure.
- the mutually opposing side surfaces of the plastic members 4, 5 have provided thereon respective electrical contact means 6, 7, e.g.
- each of the precipitation electrodes 1, 2 is electrically connected individually to its associated terminal of the d.c. voltage source 3, through a very high resistance formed by the respective antistatic plastic-member 4 and 5.
- this high resistance will also lie mutually between the various electrodes 1, 2 which are connected in common to the same terminal of the voltage cource 3.
- those electrical discharges which are able to occur at the edges of the electrodes 1, 2 will be limited to such an extent as to be totally inaudible and such as to generate no appreciable amounts of ozone.
Abstract
Description
- The present invention relates to an electrostatic precipitator for use in electrostatic filters, so-called electrofilters.
- In principle, an electrostatic precipitator comprises a multiple of electrode plates or electrode lamellae which are electrically conductive or semi-conductive and which are arranged in mutually spaced parallel relationship and alternatively connected electrically to a respective terminal of a d.c. voltage source, such as to produce a structural device similar to an air capacitor connected to both terminals of the d.c. voltage source. An electrostatic precipitator of this kind is placed in the air flow passage or duct of an electrofilter in a manner such that the electrode plates or lamellae extend transversely across the air duct or air-flow passage in which the filter is placed, with the side surfaces of said plate electrodes parallel with the direction of air flow through the duct. The air flow to be cleansed of aerosol contaminants present in the form of solid particles or liquid droplets is driven through the air-flow duct, and therewith through the precipitator, by means of a blower or fan, natural ventilation, forced draught, or with the aid of an electric ion wind (c.f. International Patent Application PCT/SE85/00538, which corresponds to EP-A-0264363). The electrofilter incorporates upstream of the electrostatic precipitator means for electrically charging the aerosol contaminants present in the air flow in some suitable known manner, e.g. by means of a corona discharge which generates air ions. The purpose of the electrostatic precipitator is therewith to bring the electrically charged contaminants in the air flow passing through the precipitator, between the various plate electrodes thereof, under the influence of the electric field which is generated between adjacent electrodes and which extends essentially at right angles to the direction of air flow, such that the contaminants will migrate to one or the other of said electrodes, depending on the electrical polarity of the contaminants, and fasten on said electrodes, therewith cleansing the air flow from said contaminants.
- In order for an electric precipitator of this kind to work with a high degree of efficiency, i.e. to be able to extract a high proportion of the contaminants present in the through-flowing air, it is necessary to generate a high field strength between mutually adjacent electrodes, i.e. small electrode interspacing and a high voltage between mutually adjacent electrodes. These requirements are extremely difficult to achieve, however, with present day electrostatic precipitator constructions. With known electrostatic precipitators, small interspaces and high voltages between mutually adjacent electrodes result in an unacceptable high risk of glow discharge from the electrodes. Such glow discharges occur in particular at the edges of the electrodes, which are normally made of thin sheet metal, and the phenomenon is particularly troublesome when these edges are sharp or irregular, as a result of the method used to manufacture said electrodes, and is heightened still further by the dirt which collects unavoidably on the precipitation electrodes while the precipitator is in use. Such glow discharges give rise to highly disturbing noise levels (crackles and rattles), and also generate ozone in undesirable and at times unacceptable levels. It will also be understood that the precipitation electrodes must be held in position at the required distance apart, in some way or another. When this is achieved with the aid of electrically insulated spacers placed between respective electrodes, the spacers unavoidably become dirty during the use of the precipitator, therewith resulting in the occurrence of creep currents on the dirty surfaces of the spacers. These creep currents gradually destroy the spacer insulation unless a very high quality insulation is used. Consequently, it is normal practice with known electrostatic precipitators of this kind to use relatively complicated, and therewith expensive, constructions in order to avoid, as far as possible the need for electrically insulating spacer elements with short creep current paths.
- It will also be understood that an electrostatic precipitator will present a significant capacitance. Consequently, a powerful capacitive discharge current will be released, if the electrodes of the precipitator are touched unintentionally. This current is highly unpleasant and may even be dangerous. Consequently, when electrofilters of this kind are to be used in a human environment, e.g. in domestic environments or working environments, it must be ensured that the electrostatic precipitator cannot be touched unintentionally. This often places on the construction of the electrofilter demands which conflict with other structural desiderata, such as small dimensions, low air-flow resistance, etc.
- One object of the invention is therefore to provide an electrostatic precipitator of the kind described in the introduction with which the aforesaid problems and difficulties are overcome, such as to enable a higher voltage and a smaller mutual interspacing to be applied between the adjacent electrodes of said precipitator, thereby achieving a more effective separation of the electrically charged aerosol contaminants from the air flowing through the precipitator or filter than can be achieved with known electrofilters of this kind.
- This object is achieved in accordance with the invention in that at least the electrodes connected to one terminal of the d.c. voltage source are connected to said terminal individually, i.e. each per se, instead of being connected directly with one another as with electrostatic precipitators known hitherto. This separate connection of the electrodes or precipitation elements to said one pole is achieved by placing a side-edge part of respective electrodes in pressure contact with one side of an individual sheet-like or strip-like member which is made of a highly resistive material and which is provided at its point of contact with said electrode with a separate electrical contact means which is connected electrically to the relevant terminal of the d.c. voltage source. An advantage is gained when the remaining electrodes are also connected to the other terminal of the voltage source in a like manner. One terminal of the high voltage source is normally earthed, wherewith at least the electrodes connected to the high voltage terminal of the d.c. voltage source are connected individually and each per se to said source in the afore-described manner.
- The aforementioned highly resistive material conveniently consists of a plastic which is highly resistive, so-called antistatic plastic or a plastic treated to become antistatic, for example a plastic material of the kind used to package semi-conductor components so that said components are protected against the effect of electrostatic voltages. Such anti-static, or anti-static treated, plastic materials are available commercially and normally have a surface resistivity of from 10⁹-10¹⁵Ω, normally in the order of 10¹³Ω.
- In accordance with the invention at least the electrodes connected to the one terminal of the d.c. voltage source, namely the non-earthed high voltage terminal of said source, are connected electrically to said terminal and to each other through very high resistances. This means that those currents which are able to occur as a result of electrical discharges from the electrodes or as a result of creep currents along electrically insulating spacer members between adjacent electrodes with differing voltages will be limited to exceedingly small values, e.g. values in the order of 10-100 nA. The aforesaid discharges will therefore be too small and too negligible to generate audible noise or to generate undesirable levels of ozone, while any creep currents that may be generated will be too small to have any deleterious influence on the insulating material. In practice, each electrode of an electrostatic precipitator that is constructed in accordance with the invention will adjust automatically to an individual voltage level in response to extremely moderate discharges and/or extremely low creep currents along the electrically insulating spacer members. Even a direct short circuit between two mutually adjacent electrodes will produce no harmful short-circuit currents, and neither will it affect the voltage level of the remaining electrodes thereby enabling the precipitator to continue to operate practically without interference. The invention also eliminates the possible occurrence of powerful comparitive discharge currents in the event of physical contact with the electrodes, thereby also eliminating the hazards or unpleasantness that such unintentional contact would otherwise cause.
- The invention will now be described in more detail with reference to an exemplifying embodiment of an electrostatic precipitator constructed in accordance with the invention and with reference to the accompanying drawing.
- The single Figure of the accompanying drawing is a schematic view of the inventive electrostatic precipitator as seen in the direction of air flow through the precipitator or the electrofilter. The air duct in which the precipitator is placed has been omitted from the illustration, for the sake of simplicity and clarity.
- The illustrated precipitator is comprised of a plurality of lamellae-like or plate-
like electrodes electrodes electrodes alternate electrode voltage source 3. In the case of the exemplified preferred embodiment of the inventive electrostatic precipitator, this connection of theprecipitation electrodes voltage source 3 is achieved by bringing one side-edge surface of a respective electrode, or at least parts of said one side-edge surface, into pressure contact with one side of a respective sheet-like or strip-like member 4 or 5 which is made of a highly resistive material, such as a so-called antistatic plastic, or a plastic which has been made antistatic. Such antistatic, or antistatic treated materials are well known per se and are used, inter alia, to wrap semi-conductor components so as to protect the same against electrostatic voltages during the transportation and storage of such components. These plastic materials have a surface resistivity of from 10⁹-10¹⁵Ω normally of the order of 10¹³Ω. The antistatic material sold by MAGNAB, Nyköping, Sweden under the designation MPAC has been found extremely suitable to the requirements of the present invention. Theplastic members 4, 5 may have a thickness of e.g. 1-5 mm, and will be slightly resilient or elastic, such as to enable the side edges of theelectrodes plastic members 4, 5 have provided thereon respective electrical contact means 6, 7, e.g. in the form of metal wires, metal-strips, metal plates or the like which are held pressed against the surfaces of respective plastic members and which areconnected electrically to a respective terminal of the d.c.voltage source 3, suitably through a respective high-ohmic resistance plastic members 4, 5 are supported in respectiverigid holders - As a result of the arrangement according to the invention, each of the
precipitation electrodes voltage source 3, through a very high resistance formed by the respective antistatic plastic-member 4 and 5. In addition to lying between theplate electrodes source 3, this high resistance will also lie mutually between thevarious electrodes voltage cource 3. Thus, those electrical discharges which are able to occur at the edges of theelectrodes respective electrodes adjacent electrodes individual electrode - The particular construction of the inventive electrostatic precipitator also ensures that no large, dangerous or unpleasant discharge currents can occur as the result of unintentional physical contact with the
elctrodes - The primary purpose of the high-
ohmic resistances plastic members 4, 5 be short-circuited, e.g., as a result of coming into unintentional contact with water. - Normally, one of the terminals of the d.c.
voltage source 3 is earthed, as illustrated in the drawing. In the case of an electrostatic precipitator constructed in accordance with the invention it is conceivable to connect this earthed terminal of the d.c.voltage source 3 directly to correspondingprecipitation electrodes 2 in a conventional manner. However, it is preferred even in cases such as these to connect the earthed terminal of thevoltage source 3 to associatedelectrodes 2 through a high-resistive antistatic or antistatic-treatedplastic member 5, as illustrated in the drawing. - It is beneficial to arrange the
precipitation electrodes electrodes 2 that are not connected to said member is greater than the mutual distance between mutuallyadjacent electrodes plastic member 5 and theelectrodes 1 is greater than the mutual distance between mutuallyadjacent electrodes electrodes 2 and the plastic member 4, and between theelectrodes 1 and theplastic member 5. - The
electrodes precipitation electrodes - Since the
precipitation electrodes electrodes
Claims (7)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT87907361T ATE70997T1 (en) | 1986-10-30 | 1987-10-29 | ELECTROSTATIC PRECIPITATION DEVICE FOR USE WITH ELECTRIC FILTERS. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE8604634A SE455170B (en) | 1986-10-30 | 1986-10-30 | ELECTROFILTER Condenser Separator |
SE8604634 | 1986-10-30 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0332624A1 EP0332624A1 (en) | 1989-09-20 |
EP0332624B1 true EP0332624B1 (en) | 1992-01-02 |
Family
ID=20366124
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP87907361A Expired - Lifetime EP0332624B1 (en) | 1986-10-30 | 1987-10-29 | An electrostatic precipitator for use in electrofilters |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP0332624B1 (en) |
JP (1) | JPH0773685B2 (en) |
AT (1) | ATE70997T1 (en) |
AU (1) | AU8230287A (en) |
DE (1) | DE3775779D1 (en) |
SE (1) | SE455170B (en) |
WO (1) | WO1988003057A1 (en) |
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7662348B2 (en) | 1998-11-05 | 2010-02-16 | Sharper Image Acquistion LLC | Air conditioner devices |
US7724492B2 (en) | 2003-09-05 | 2010-05-25 | Tessera, Inc. | Emitter electrode having a strip shape |
US7767165B2 (en) | 1998-11-05 | 2010-08-03 | Sharper Image Acquisition Llc | Personal electro-kinetic air transporter-conditioner |
US7767169B2 (en) | 2003-12-11 | 2010-08-03 | Sharper Image Acquisition Llc | Electro-kinetic air transporter-conditioner system and method to oxidize volatile organic compounds |
US7833322B2 (en) | 2006-02-28 | 2010-11-16 | Sharper Image Acquisition Llc | Air treatment apparatus having a voltage control device responsive to current sensing |
US7897118B2 (en) | 2004-07-23 | 2011-03-01 | Sharper Image Acquisition Llc | Air conditioner device with removable driver electrodes |
US7906080B1 (en) | 2003-09-05 | 2011-03-15 | Sharper Image Acquisition Llc | Air treatment apparatus having a liquid holder and a bipolar ionization device |
US7959869B2 (en) | 1998-11-05 | 2011-06-14 | Sharper Image Acquisition Llc | Air treatment apparatus with a circuit operable to sense arcing |
US8043573B2 (en) | 2004-02-18 | 2011-10-25 | Tessera, Inc. | Electro-kinetic air transporter with mechanism for emitter electrode travel past cleaning member |
US10792673B2 (en) | 2018-12-13 | 2020-10-06 | Agentis Air Llc | Electrostatic air cleaner |
US10828646B2 (en) | 2016-07-18 | 2020-11-10 | Agentis Air Llc | Electrostatic air filter |
US10875034B2 (en) | 2018-12-13 | 2020-12-29 | Agentis Air Llc | Electrostatic precipitator |
US10882053B2 (en) | 2016-06-14 | 2021-01-05 | Agentis Air Llc | Electrostatic air filter |
US10960407B2 (en) | 2016-06-14 | 2021-03-30 | Agentis Air Llc | Collecting electrode |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0522044U (en) * | 1991-09-06 | 1993-03-23 | 山武ハネウエル株式会社 | Dust collection cell |
SE469466B (en) * | 1992-02-20 | 1993-07-12 | Tl Vent Ab | DOUBLE STEP ELECTROFILTER |
SE9400110L (en) * | 1994-01-17 | 1995-07-18 | Tl Vent Ab | air cleaning apparatus |
CN1911526B (en) * | 2005-08-10 | 2010-08-18 | 金烈水 | High efficiency electrostatic dust separator |
JP2010063964A (en) * | 2008-09-09 | 2010-03-25 | Panasonic Corp | Dust collecting apparatus |
US9005347B2 (en) | 2011-09-09 | 2015-04-14 | Fka Distributing Co., Llc | Air purifier |
JP7015596B1 (en) * | 2021-06-18 | 2022-02-03 | エステアール株式会社 | Transparent electrostatic adsorption partition and transparent electrostatic adsorption partition system |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AT377204B (en) * | 1980-11-05 | 1985-02-25 | Hans Oppitz | ELECTRODE FOR PREFERRED ELECTROSTATIC APPLICATIONS |
US4477268A (en) * | 1981-03-26 | 1984-10-16 | Kalt Charles G | Multi-layered electrostatic particle collector electrodes |
-
1986
- 1986-10-30 SE SE8604634A patent/SE455170B/en not_active IP Right Cessation
-
1987
- 1987-10-29 EP EP87907361A patent/EP0332624B1/en not_active Expired - Lifetime
- 1987-10-29 AU AU82302/87A patent/AU8230287A/en not_active Abandoned
- 1987-10-29 AT AT87907361T patent/ATE70997T1/en not_active IP Right Cessation
- 1987-10-29 WO PCT/SE1987/000509 patent/WO1988003057A1/en active IP Right Grant
- 1987-10-29 JP JP62506846A patent/JPH0773685B2/en not_active Expired - Fee Related
- 1987-10-29 DE DE8787907361T patent/DE3775779D1/en not_active Expired - Fee Related
Cited By (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7959869B2 (en) | 1998-11-05 | 2011-06-14 | Sharper Image Acquisition Llc | Air treatment apparatus with a circuit operable to sense arcing |
USRE41812E1 (en) | 1998-11-05 | 2010-10-12 | Sharper Image Acquisition Llc | Electro-kinetic air transporter-conditioner |
US7767165B2 (en) | 1998-11-05 | 2010-08-03 | Sharper Image Acquisition Llc | Personal electro-kinetic air transporter-conditioner |
US7662348B2 (en) | 1998-11-05 | 2010-02-16 | Sharper Image Acquistion LLC | Air conditioner devices |
US7724492B2 (en) | 2003-09-05 | 2010-05-25 | Tessera, Inc. | Emitter electrode having a strip shape |
US7906080B1 (en) | 2003-09-05 | 2011-03-15 | Sharper Image Acquisition Llc | Air treatment apparatus having a liquid holder and a bipolar ionization device |
US7767169B2 (en) | 2003-12-11 | 2010-08-03 | Sharper Image Acquisition Llc | Electro-kinetic air transporter-conditioner system and method to oxidize volatile organic compounds |
US8043573B2 (en) | 2004-02-18 | 2011-10-25 | Tessera, Inc. | Electro-kinetic air transporter with mechanism for emitter electrode travel past cleaning member |
US7897118B2 (en) | 2004-07-23 | 2011-03-01 | Sharper Image Acquisition Llc | Air conditioner device with removable driver electrodes |
US7833322B2 (en) | 2006-02-28 | 2010-11-16 | Sharper Image Acquisition Llc | Air treatment apparatus having a voltage control device responsive to current sensing |
US10882053B2 (en) | 2016-06-14 | 2021-01-05 | Agentis Air Llc | Electrostatic air filter |
US10960407B2 (en) | 2016-06-14 | 2021-03-30 | Agentis Air Llc | Collecting electrode |
US10828646B2 (en) | 2016-07-18 | 2020-11-10 | Agentis Air Llc | Electrostatic air filter |
US10792673B2 (en) | 2018-12-13 | 2020-10-06 | Agentis Air Llc | Electrostatic air cleaner |
US10875034B2 (en) | 2018-12-13 | 2020-12-29 | Agentis Air Llc | Electrostatic precipitator |
US11123750B2 (en) | 2018-12-13 | 2021-09-21 | Agentis Air Llc | Electrode array air cleaner |
Also Published As
Publication number | Publication date |
---|---|
SE455170B (en) | 1988-06-27 |
DE3775779D1 (en) | 1992-02-13 |
JPH02500727A (en) | 1990-03-15 |
SE8604634D0 (en) | 1986-10-30 |
JPH0773685B2 (en) | 1995-08-09 |
WO1988003057A1 (en) | 1988-05-05 |
ATE70997T1 (en) | 1992-01-15 |
SE8604634L (en) | 1988-05-01 |
AU8230287A (en) | 1988-05-25 |
EP0332624A1 (en) | 1989-09-20 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP0332624B1 (en) | An electrostatic precipitator for use in electrofilters | |
US4351648A (en) | Electrostatic precipitator having dual polarity ionizing cell | |
JP3424754B2 (en) | Two-stage electrostatic filter | |
KR102336514B1 (en) | Electrical precipitator and manufacturing method for precipitation unit | |
WO1995014534A1 (en) | A precipitator for an electrostatic filter | |
GB1564171A (en) | Electrostatic precipitators | |
US6096119A (en) | Apparatus for using ferrite spacers to suppress arc noise in electrostatic precipitators | |
EP0848648A1 (en) | Precipitator for cleaning of air from electrically charged aerosols | |
KR920003529B1 (en) | Air cleaner | |
US4049400A (en) | Air purifying apparatus | |
US2908347A (en) | Electrostatic precipitators | |
US3849090A (en) | Electrostatic precipitator | |
KR102466261B1 (en) | Racks for electrostatic filters and filter plates of electrostatic filters | |
US11813617B2 (en) | Electrode elements of high resistivity for two-step electrofilter | |
JP2001062343A (en) | Electric dust collector element | |
JPH0231155Y2 (en) | ||
JP7127250B2 (en) | Electrostatic precipitator | |
GB904137A (en) | Improvements in or relating to electrostatic precipitators | |
JPH0231157Y2 (en) | ||
JPH0889844A (en) | Collector of air cleaner | |
RU2020137501A (en) | ELECTRODE ELEMENTS WITH HIGH SPECIFIC RESISTANCE FOR A TWO-STAGE ELECTRIC FILTER | |
JPH0636878B2 (en) | Structure of paper dust collecting electrode | |
JPS641006Y2 (en) | ||
JPH06233946A (en) | Electric dust collecting element | |
GB790274A (en) | Improvements in or relating to electrostatic precipitators |
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: 19890411 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE CH DE FR GB IT LI NL |
|
17Q | First examination report despatched |
Effective date: 19910125 |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): AT BE CH DE FR GB IT LI NL |
|
REF | Corresponds to: |
Ref document number: 70997 Country of ref document: AT Date of ref document: 19920115 Kind code of ref document: T |
|
REF | Corresponds to: |
Ref document number: 3775779 Country of ref document: DE Date of ref document: 19920213 |
|
ET | Fr: translation filed | ||
ITF | It: translation for a ep patent filed |
Owner name: UFFICIO BREVETTI CALCIATI S.R.L. |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 19921005 Year of fee payment: 6 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: AT Payment date: 19921014 Year of fee payment: 6 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: CH Payment date: 19921026 Year of fee payment: 6 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: NL Payment date: 19921031 Year of fee payment: 6 |
|
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 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: BE Payment date: 19921116 Year of fee payment: 6 |
|
26N | No opposition filed | ||
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: AT Effective date: 19931029 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LI Effective date: 19931031 Ref country code: CH Effective date: 19931031 Ref country code: BE Effective date: 19931031 |
|
BERE | Be: lapsed |
Owner name: ASTRAVENT A.B. Effective date: 19931031 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: NL Effective date: 19940501 |
|
NLV4 | Nl: lapsed or anulled due to non-payment of the annual fee | ||
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Effective date: 19940630 |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: PL |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 19951020 Year of fee payment: 9 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Effective date: 19961029 |
|
GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 19961029 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 20031103 Year of fee payment: 17 |
|
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 NON-PAYMENT OF DUE FEES Effective date: 20050503 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;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: 20051029 |