Abstract: A collecting device for collecting particles floating in the atmosphere includes a collecting container; a pump for sucking the atmosphere into the collecting container; a discharge electrode disposed in the collecting container for generating single polarity ions to charge the particles in the collecting container; and a dust-collecting electrode for collecting the charged particles in the collecting container through a potential difference between the discharge electrode and the dust-collecting electrode. The dust on the dust-collecting electrode is measured and analyzed.

Abstract: An air conditioner with a cleaning member having an opening, through which a wire-like electrode passes. The member is moved along the wire to frictionally clean the wire-like electrode when a collector electrode array is moved. A lifting arm is mounted to the collector electrode. The lifting arm can move the member to clean the wire-like electrode as the collector electrode is moved (e.g., removed from the air conditioner for cleaning).

Abstract: An air cleaner electrode assembly includes an elongated collector electrode and a plurality of elongated discharge electrodes arranged around the collector electrode. A fan may move air in a direction parallel to a length of the electrodes. The collector electrode may have a plurality of distinct faces where at least one discharge electrode is associated with a corresponding face. A cleaning shuttle may be configured to ride on and remove debris from the elongated electrodes. A voltage differential across the electrodes and the fan speed may be adjusted independently of each other.

Abstract: An electrostatic precipitator using substantially planar screens of similar charge positioned perpendicular to the gas flow direction. The screens have a similar charge of the same polarity, and particles flowing through the screens are charged, agglomerated and either collected on the screens or fall downwardly into collecting hoppers below the screens. The screens preferably have openings smaller than 3 millimeters and are spaced apart less than 10 millimeters. In an alternative embodiment, the screens have alternating polarities and are spaced about an inch or more apart to prevent sparkover.

Abstract: Fine particles of dust and other pollutants in gas streams are agglomerated to form larger particles which are more easily filtered in downstream processing. In one embodiment, particles in successive portions of the gas stream are charged with opposite polarity, and the gas stream is introduced into an Evasé portion (12) to slow it down. Particles of different sizes have differential deceleration and therefore mix generally in the direction of flow, leading to agglomeration of oppositely-charged particles. In another embodiment, a gas stream is divided into substreams in respective parallel passages, and the particles in adjacent passages are charged to opposite polarity. Deflectors at the downstream end of the passages cause substreams of particles of opposite polarity to mix, with resultant agglomeration of oppositely charged particles.

Abstract: A cleaning mechanism for a wire electrode of an air purifier device includes a base, a post having a first end attached to the base and a second end accessible from a location external the housing, a cleaning plate assembly attached to the base, wherein the cleaning plate assembly frictionally contacts the wire electrode when moved relative to the wire electrode. The cleaning plate assembly is movable within the housing when the second end of the post is moved from a resting configuration to a cleaning configuration.

Abstract: Particles in a fluid flow are concentrated by a combination of electrical charging and focussing and passage through a virtual impact concentrator. The fluid is passed through an electrical charging section and an electrical focussing section and then to a virtual impact concentrator. The majority of charged particles in a selected size range are collected through a minor discharge passage extending axially from the virtual impact concentrator. The invention is particularly suitable for sampling engine exhaust gases and ambient aerosols.

Abstract: A gas particle partitioner (GPP) removes particles from an aerosol with high efficiency and with no or minimum changes to the thermodynamic conditions and chemical composition of the gas phase of the aerosol. A permeable grid electrode surrounds a corona wire and separates an interior corona discharge area from an exterior aerosol charging zone. A particle free fluid washes the corona discharge area to minimize any transport of gas components produced by corona discharge to the aerosol. The charged particles in the aerosol are deflected by an electric field in a fractionator to selectively produce a particle free sample stream, which is then separated by a flow splitter from the aerosol.

Abstract: An electro-kinetic electro-static air conditioner with a bead member having a bore, through which a wire-like electrode passes. The bead is moved along the wire to frictionally clean the wire-like electrode when an electrode array is removed. A bead lifting arm is mounted to the electrode array. The bead lifting arm can move the bead to clean the electrode as electrode array is removed from the air conditioner for cleaning.

Abstract: This disclosure relates to a method for deaerating a liquid layer such as a coating solution using electrostatic forces. A flow of charged particles is created above and moved towards a low conductivity liquid layer. The flow of charged particles causes localized thinning of the liquid layer which facilitates the removal of bubbles of entrained gas from the liquid by bringing those bubbles closer to the exposed surface of the liquid and rupturing them at that surface. This electrostatic deaeration technique is combined with other non-electrostatic liquid layer thinning techniques or degassing techniques to further facilitate removal of bubbles from the liquid in preparation of further processing of the liquid. The liquid layer may be stationary or flowing with respect to the application of charge particles.

Abstract: An electro-kinetic electro-static air conditioner includes a mechanism to clean the wire-like electrodes in the first electrode array. A length of flexible Mylar type sheet material projects from the base of the second electrode array towards and beyond the first electrode array. The distal end of each sheet includes a slit that engages a corresponding wire-like electrode. As a user moves the second electrode array up or down within the conditioner housing, friction between slit edges and the wire-like electrode cleans the electrode surface. The sheet material may be biasedly pivotably attached to the base of the second electrode array, and may be urged away from and parallel to the wire-like electrodes when the conditioner is in use. Another embodiment includes a bead-like member having a through opening or channel, through which the wire-like electrode passes.

Abstract: When an ionization section is taken out of a main body housing of a conventional air cleaner in order to wash the ionization section, an ionization line may be cut by being accidentally touched. In order to avoid this problem, a pre-filter (7) is mounted on a front surface of an ionization and dust collection unit (6) so as to be detachable. The pre-filter (7) is slidably guided by guide furrings (23) in a sub-frame (12), and is mounted on a front surface of the sub-frame (12). When the pre-filter (7) is mounted, ionization lines (15) are not exposed, so that the pre-filter (7) protects the ionization lines (15). When the ionization and dust collection unit (6) is detached from the main body housing, therefore, there is no problem that the ionization lines (15) might be cut by being accidentally touched with worker's hands, for example.

Abstract: A sintered stainless steel filter is used as the grounded electrode of a point-to-plane electrostatic precipitator. Particles flow through, rather than parallel to, the collection plate. Particle collection efficiency is empirically shown to increase as the charged particles are drawn closer to the grounded filter. The utilization of stainless steel fiber filter provides (1) low particle penetration (high particle collection efficiency) of different particle range, (2) applicability to all different particulate components, (3) high loading capacity but low pressure drop (less energy and maintenance needed), (5) low electric voltage for operating the system, and (6) low cost and small dimension.

Abstract: An electrostatic precipitator includes an upright hollow body having a lower smoke inlet and an upper smoke outlet, with a pair of spaced horizontal partitions formed in the hollow body between the inlet and outlet. A set of parallel ducts extends vertically between the partitions, and a pair of distributor frames is arranged in the hollow body, with one of the distributor frames disposed over the ducts and the other of the distributor frames disposed under the ducts. Between the distributor frames is stretched a plurality of wires that extend through respective ducts. Furthermore, each of the distributor frames is formed with a plurality of terminals to be electrically connected to one electrode of a DC high-voltage power supply, but the ducts are adapted to be electrically connected to the other electrode of the DC high-voltage power supply.

Abstract: An apparatus for removing particles from a gas in a high purity flowing gas system is provided which includes a flow tube inserted inline in the flowing gas system having an inlet and an outlet, a pressure sealed, electrically insulated feed-through integral to the flow tube, an emitter inserted through the feed-through into the flow tube to create a plasma in the gas to charge particles in the gas, and a collector surface in proximity to the emitter; whereby an electric field between the emitter and the collector surface draws the particles in the gas to the collector surface.

Abstract: A pleated filter is provided with electrically conductive fibrous material that releases ions to improve trapping efficiency. The edges of folded filter media are rendered emitting as by attaching conductive strings to the edges of the folds. The ends of the fibers in the strings are left exposed and, by applying high voltage on these strings, ions may be produced which charge dust particles to improve the filter's efficiency. Alternately, the pleated medium itself provides ion-emitting fiber ends along folded edges that have been rendered conductive.

Abstract: An air cleaner having a minus ion generator and a positive electrode. The minus ion generator carries a high minus voltage, and the positive electrode carries a high plus voltage. Preferably, the minus ion generator has a heater. The air cleaner may have an absorbing sheet positioned close to the positive electrode. Preferably, the minus ion generator is spaced apart from the positive electrode by a distance not less than a half of the maximum distance between walls of room. Preferably, the high plus voltage is not less than 4,000 Volts, and the absolute value of the high minus voltage is larger than the absolute value of the high plus voltage. Preferably, the air cleaner has a sterilizing function.

Abstract: The invention relates to a device for producing active oxygen ions in the air for improved air quality, comprising at least one air ionizer and an electric transformer producing sufficient electrical high voltage for air ionization. The air ionizer is coupled to a sensor which detects the oxidizable gas content in the air (air pollution sensor). On the basis of the detected content of such oxidizable gases, the electrical energy which is guided to the air ionizer is transformed by an electrical control device in such a way that only low-level ionization occurs at low concentration of oxidizable gases. Said ionization is sensor-controlled and can automatically be increased to a maximum value when the concentration of oxidizable gases rises.

Abstract: A hand-holdable electro-kinetic electro-static ionic air refreshener-conditioner for a pet shelter or litter box includes a self-contained ion generator that provides electro-kinetically moved air with ions and safe amounts of ozone. The ion generator includes a high voltage pulse generator whose output pulses are coupled between first and second electrode arrays. Preferably the first array comprises one or more pin-like electrodes and the second array comprises one more washer-like electrodes. Preferably a ratio between effective area of an electrode in the second array compared to effective area of an electrode in the first array exceeds about 15:1 and preferably is about 20:1. An electric field produced by the high voltage pulses between the arrays produces an electrostatic flow of ionized air containing safe amounts of ozone. Optionally, a sensor detects odor adjacent the refreshener-conditioner causes the ion generator to be activated when sensed odor exceeds a predetermined threshold.

Abstract: An electrostatic precipitator has a high voltage electrode including multiple wire segments that are positioned within a surrounding electrically conductive porous media having a central axis and wherein the electrode assembly extends along the central axis. The electrode assembly has a plurality of wire lengths positioned to extend in a direction along the longitudinal axis of the porous media, and the wire segments being arranged to have a substantially longer total length than the length of extension along the longitudinal axis. An aerosol containing droplets is passed into the interior of the porous media, and across the electrode, which is charged with a high voltage. The porous media is at a substantially lower or different voltage from the high voltage electrodes. Flow of the aerosol containing particles charged by the electrode passes through the porous media to the outlet and the charged particles are precipitated by the porous media.

Abstract: A broom type particle collector has a particle pick-up assembly joined to an elongated handle. The pick-up assembly has a non-electrical conductive foam plastic member accommodating a cathode for imparting negative charges or particles and an anode for collecting the charged particles. An electrical power supply located within the handle provides electric power to the cathode and anode.

Abstract: An electronic dust collector has a discharge line spaced parallel to a dust collector electrode. Discharge line fixing parts at the ends of the discharge line are bent outward to increase the distance from the dust collector electrode, thereby reducing the likelihood of abnormal discharge between the discharge line fixing parts and the dust collector electrode. In another embodiment, the discharge line and the discharge line fixing parts remain in alignment, and the ends of the dust collector electrode facing the line fixing parts are bent outward. The electronic dust collector may be part of an air conditioner. The dust collector electrode has a heater therein for self cleaning.

Abstract: An electrostatic air cleaner includes a corona charging section and a precipitation section. The charging section includes a first and a second array of substantially parallel earth wires, each array being disposed in a respective plane substantially perpendicular to the direction of air flow, and a third array of substantially parallel corona wires sandwiched between the first and second arrays. With this design, the spacing between earth wires and the spacing between corona wires can be selected independently to obtain the most favorable corona discharge conditions. The arrangement also enables easy cleaning of the earth wires.

Abstract: An electrostatic precipitator has a high voltage electrode including multiple wire segments that are positioned within a surrounding electrically conductive porous media having a central axis and wherein the electrode assembly extends along the central axis. The electrode assembly has a plurality of wire lengths positioned to extend in a direction along the longitudinal axis of the porous media, and the wire segments being arranged to have a substantially longer total length than the length of extension along the longitudinal axis. An aerosol containing droplets is passed into the interior of the porous media, and across the electrode, which is charged with a high voltage. The porous media is at a substantially lower or different voltage from the high voltage electrodes. Flow of the aerosol containing particles charged by the electrode passes through the porous media to the outlet and the charged particles are precipitated by the porous media.

Abstract: A vacuum cleaner exhaust filter assembly includes a main HEPA exhaust filter, and an ion generation stage to add ions to the air. The ion generation stage preferably is a polypropylene mesh which generates ions through static electric interaction with the moving air as the result of friction. The exhaust filter assembly preferably also includes a pre-filter impregnated with carbon, preferably in the form of activated charcoal, to absorb odors from the exhaust air. The filter components, arranged in the preferred order, are the carbon pre-filter, the main HEPA exhaust filter, and the ion generation mesh.

Abstract: An air conditioner equipped with an air cleaner. In the air conditioner, a dust collector is arranged in an air path located behind a heat exchanger. A dust collecting electrode of the dust collector is combined with a heater for self-cleaning. An opening, which communicates the air path located behind the heat exchanger with the outside, is provided above the dust collector. An open-and-close valve, which is closed during the air conditioning operation and opened in the case where the air cleaning operation is carried out while the air conditioning operation is stopped, is provided at the opening. The dust collector does not interrupt the flow of air during the air conditioning operation and also in the case where the air cleaning operation is carried out while the air conditioning operation is stopped.

Abstract: An electrical dust collector has an ionization section for ionizing dust in air, and a collection section for collecting the ionized dust. The ionization section includes a high voltage wire to which a high voltage is applied, and a grounding member disposed near the high voltage wire so as to be spaced by a predetermined distance. An insulating member is disposed between the high voltage wire and the grounding member. The insulating member electrically insulates the space between the grounding member and at least an end of the high voltage line. An electrical discharge between the high voltage wire and the grounding member is prevented by the insulating member, whereby the operation of the electrical dust collector is stabilized.

Abstract: An air conditioner includes an electric dust collector arranged between an evaporator and a heat shield plate. This electric dust collector includes a discharge electrode and a dust collecting electrode. The discharge electrode is applied with a positive polarity of high direct current voltage from a high voltage power source, while the dust collecting electrode is supplied with a negative polarity of high direct current voltage. Accordingly, the dust charged through plus electric discharge by the discharge electrode is attracted onto the dust collecting electrode or a casing thereof.

Abstract: An electrostatic filter for the separation of particles includes a particle charging unit arranged upstream, including at least one corona wire for the charging of particles and a particle collector unit arranged downstream relative to it. The particles collecting unit includes two groups of plate-like elements (1, 1') arranged essentially parallel between each other and the flow direction through the device at a predetermined distance from each other, wherein a first group of elements (1)is connected to earth (3) and a second group elements (1') is electrically insulated with reference to the device and to the first group of elements (1) and that the elements (1, 1') essentially are made of one or more non-hygroscopic polymer materials with a mass resistivity which preferably lies within the region of 1.times.10.sup.2 .OMEGA.cm to 1.times.10.sup.8 .OMEGA.cm.

Abstract: An apparatus for ionizing air to remove particulate matter. The apparatus including an ionizer and a bracket for mounting the ionizer and a bracket for mounting the ionizer in a duct or enclosure. The ionizer includes a series of electrodes which span a portion of the duct. The electrodes are energized by a high voltage circuit and an ionic wind is created between the electrode and duct. The ionic wind sweeps particles in the air to the duct which provides a collector electrode. In another embodiment, a ring collector electrode is also provided for spanning the inner portion of the duct. The high voltage circuit includes a DC power supply, a high voltage transformer, a high voltage multiplier stage and a push-pull switching circuit. The DC power supply receives AC power and generates a DC output which is coupled to the primary of the transformer. The push-pull switching circuit produces a controlled and efficient AC output in the transformer by alternately switching the primary winding.

Abstract: An electric discharge wire-holding structure for a wet-type electric dust collector is disclosed. The holding structure is capable of increasing the service life of electric discharge wires by preventing the presence of a minute clearance at the end of the electric discharge wire which is fastened on the electrode bar, thereby providing a continuous path for a flowing current and preventing electric wear due to a potential difference. The holding structure includes a hook provided at the fastened end of an electric discharge wire, and which is fastened on a planar set seat formed on an electrode bar by a set screw.

Abstract: Collection of particles from a gas stream and the separation of dissimilar particles from a gas stream by a field effect auxiliary gas cyclone (FEAGC) is enhanced by providing an inductive field that attracts or repels particles and an auxiliary gas system that complements the field effect by providing an additional independent internal control for particle velocity, particle concentration, and system delta p. The FEAGC has three adjustable operating variables: (1) an auxiliary high pressure air input orifice located in the cyclone input which is used to increase the product velocity while reducing the solids to gas ratio; (2) an electric field between the cone and the vortex that subjects charged particles to either an attractive or repelling field; and (3) an auxiliary air venturi located in the inlet of the vortex to control the delta p and to control the operating temperature of the vortex and insulating materials.

Abstract: An air cleaning apparatus, especially for cleaning of room air, includes an ionizing device (14) having a unipolar ion source formed by a corona discharge electrode, an electrostatic precipitator (12) connected to a high-voltage source (15) and having a flow-through passageway (18) for air to be cleaned and two groups of electrode elements (16, 17) disposed in the flow-through passageway, the electrode elements (16) of one group being interleaved with and spaced from the electrode elements (17) of the other group and arranged to be at a potential different from that of the said other group. The corona discharge electrode (21) is arranged such that the ions generated at the electrode can diffuse essentially freely away from the electrode and thereby diffuse substantially freely throughout the room in which the ionizing device (14) is positioned.

Abstract: A gasification system for solid wastes having a thermal reactor and a mechanical gas cleaner, an indirect heat exchange cooler, and an electrostatic precipitator for cleaning and cooling the produced gas. Feed material is continuously fed to the central section of the thermal reactor above an air introduction manifold and nozzles and in an upward direction, forming a stratified charge. As feed material moves upward and outward from the reactor center it is reduced to ash. An agitator assures contact between the hot particulate product and hot gases resulting in gasification of the feed material and net movement to the sidewall of the thermal reactor, forming ash. The air introduction nozzles serve as a grate. Ash descends along the sidewall to the reactor base for removal. The mechanical cleaner has a high speed rotating brush-like gas separator element and scraper combination which removes condensed tars and particulates from the produced gas stream.

Abstract: A filter apparatus of the present invention includes a filter housing having an inlet and an outlet and a filter device locatable therebetween. The filter device includes a filter medium, an electrically conductive screen or mesh, and a conductor for supplying high voltage power. The conductor abuts the filter medium such that when the conductor is subject to a high voltage, the filter medium is polarized and nothing, apart from air or a support or retention material of dielectric material, is on a side of the filter medium immediately opposite to the conductor and no other charge applying device is located upstream of the conductor.

Abstract: A discharge electrode for electrostatic precipitators has a support composed of an electrically non-conductive material, a fabric composed of crossed and twisted threads and disposed on an exterior of the support, the support having an upper end and a lower end, and further comprising an additional layer of a synthetic elastomer which covers at least one of the ends over a length of 400-600 mm. Also, an electrostatic precipitator for treatment of exhaust gasses containing SO.sub.2, SO.sub.3, HF or HCL is proposed with the new discharge electrode.

Abstract: In electric filters with a negative corona, an aerosol is formed in the entrance area if ammonia is present in the flue gas, reducing the separation performance of the filter. To avoid this, spray electrodes and separation electrodes provided in the entrance area of the filter are wired so that a positive corona forms there. In sections downstream in the flow direction of the gas, spray electrodes and separation electrodes are wired such that a negative corona forms there.

Abstract: An electrostatically enhanced separator (EES) which provides mechanical separation and electrostatic separation to yield a compact and highly efficient separation system. The EES (10) may be incorporated in a collection system as well using a conventional collection device such as a cyclone collector (32), bag filter (37) or electrostatic precipitator (38). The EES (10) includes a cylindrical-walled separation chamber (11) with an inlet passage (13), a clean flow outlet (21), and a particle outlet passage (15). The inlet passage (13) and particle outlet passage (15) are both thin elongated slits which open tangentially to the cylindrical wall of the chamber for providing a substantially flush incoming flow path dispersed lengthwise along the wall.

Abstract: An air ionization device for use in industrial, commercial or residential settings which includes a core section shaped to provide internal venturi action in order to force air outwardly from an ozone manifold. Air fins are provided at the front of the cabinet to prevent turbulence of air as it exits the cabinet. The device further includes electronics for providing controlled negative ozone and ionization output, and a 12 VDC power supply for operating system fans and relays. The device can operate as a master unit to control up to four slave units (i.e. up to five units on one system) for providing even distribution of ions and ozone over large industrial areas. In addition, various features are provided to allow for facile servicing of the device, including a purging hose mounted inside the core, removably replaceable ionization needles, and ozone relief holes positioned directly behind the ionization needles for constantly purging the needles and keeping them clean.

Abstract: A corona-assisted electrostatic filtration apparatus which includes a cathode, an anode filter element, and a means of establishing a nonalternating potential difference between the cathode and the anode which is sufficient to maintain a corona field of ionized gas between the cathode and the anode filter element. The anode filter element includes a porous fibrous sheet material having pores in a range of from about 0.1 to about 100 micrometers, with at least a portion of the fibers thereof being uniformly coated with a metal. Also provided is a method of utilizing such apparatus to remove particulate matter from a gaseous medium.

Abstract: An apparatus for ionizing air to remove particulate matter. The apparatus including an ionizer and a bracket for mounting the ionizer in a duct or enclosure. The ionizer includes a series of electrodes which span a portion of the duct. The electrodes are energized by a high voltage circuit and an ionic wind is created between the electrode and duct. The ionic wind sweeps particles in the air to the duct which provides a collector electrode. In another embodiment, a ring collector electrode is also provided for spanning the inner portion of the duct. The high voltage circuit includes a DC power supply, a high voltage transformer, a high voltage multiplier stage and a push-pull switching circuit. The DC power supply receives AC power and generates a DC output which is coupled to the primary of the transformer. The push-pull switching circuit produces a controlled and efficient AC output in the transformer by alternately switching the primary winding.

Abstract: A high efficiency electronic air filter is disclosed in which pads of dielectric fibres are sandwiched between electrically charged, ionizing elements and grounded screens. The ionizing elements charge the dust particles passing through the filter and at the same time polarize the fibrous pads. In this way, the charged particles are attracted and collected on the fibrous pads with improved efficiency.

Abstract: Ionization apparatus including a housing, a high voltage source having a high voltage terminal and a ground return terminal, an ionization electrode inside the housing electrically connected to the high voltage terminal and a grounding wire mounted to the exterior surface of the housing and electrically connected to the ground return terminal.

Abstract: A two-stage electrostatic filter is provided for air recirculation units. The filter includes at least one ionization stage (100) formed by parallel facing walls, in which a high-potential electrode (50) is located, and at least one precipitation stage (200) formed by parallel walls of negative potential in relation to the ionization stage. The ionization and precipitation stages-include at least one inverted U-shaped cathode (10), the opposite ends of which are mechanically and electrically integral with a transverse supporting section (20) and within which is provided at least one baffle (10b) extending parallel to outer arms (10a) of the U-shaped cathode, but with a height lower than that of the arms. The cathode (10) cooperates with a U-shaped anode (30; 1030) counterposed thereto and rendered mechanically integral by insulated supports (40). There are also provided further cathodes (110b; 2110b) for the modular expansion of the filter in the direction of its width.

Abstract: An air purifier has discharge electrodes which generate a corona emission. These discharge electrodes are disposed within a flow passage provided in the air purifier along with a blower. Also included in the air purifier is a filter which scavenges contaminant particles in the air charged by the discharge electrodes. A control unit detects a discharge current of the discharge electrodes to control a rotational speed of the blower in accordance with the detected emission current.

Abstract: A high voltage electrostatic filter has alternating oppositely charged plates with an ionizing wire affixed directly to alternate plates so as to be included in a removable charged assembly unit which may also include the high voltage source and deflection of the direction of air flow by the charged plates brings airborne particulate into contact with the plates.

Abstract: An electrostatically stimulated air filter and process, contemplates a housing having an fluid intake and a fluid exhaust; a upstream electrode, disposed downstream of the fluid intake, for carrying a ground potential; a filter, disposed downstream of the prefilter, for filtering out contaminants in the fluid; an ionizing electrode, disposed between the filter and the prefilter, for carrying a second potential; and a downstream electrode, disposed downstream of the filter, for carrying a ground potential; and a fan, downstream of the filter, for driving air through the prefilter and the filter. Ionization of incoming fluid occurs as a result of electric fields generated by the downstream electrode, the ionizing electrode, and the upstream electrode. The filter comprises an upstream dielectric layer and a downstream conductive layer, usually fibers coated with activated carbon powder.

Abstract: A first recess for detachably mounting an ionizer therethrough is formed to oppose a dust-collecting air suction side of a precipitator machine body. The ionizer includes an ionizing wire unit having an ionizing wire, and a counterelectrode plate, which can be detachably assembled. A second recess for detachably mounting a dust collector therethrough is formed to oppose a dust-collecting air discharge side of the precipitator body. The dust collector captures and collects dust particles, charged by the ionizer, with a Coulomb force. The ionizer and dust collector are simultaneously electrically connected to the body when they are mounted on the corresponding recesses.

Abstract: Method and apparatus for removing radon decay products wherein a fan directs air through a conductive cylinder that is grounded. Positioned axially within the cylinder is one or more cylindrical brushes, each having a shaft and radially extending conductive bristles with distal ends spaced from the cylinder. The shaft is connected to the fan so that the bristles rotate. Also, a static electric potential is applied to the bristles. The relative motion of the air and bristles is particularly effective at enhancing molecular diffusion to cause small unattached radon decay products to plate out on the bristles. In contrast, the electrostatic charging of the bristles and the resulting diffusion charging is particularly effective at exerting a force on larger particles to which radon decay products are attached thus causing the particles to migrate and plate out on the cylinder.

Abstract: A dust collector includes a front case and a rear case. A discharging electrode plate and an electrical charge plate are arranged zig-zag along guide elements formed in the front case, the guide elements extending in a front-to-rear direction. A dust collecting part is installed under the discharging electrode plate and the electrical charge electrode plate. An active carbon filter is installed in the rear case in order to deodorize the air.