Abstract: An electrostatic spray painting apparatus includes an electrically-insulated intermediate reservoir for storing therein conductive paint to which a high voltage is directly applied. In addition, the intermediate reservoir includes a cylinder, a piston reciprocatively and slidably disposed within the cylinder, and a fluid-flow straightening member protrudently formed in a part of a cylinder chamber used to be charged with the paint. The cylinder chamber is defined by the cylinder and the piston. An injection hole is defined near an outer peripheral edge of a cylinder wall so as to be connected to a paint and cleaning fluid feed source. A discharge hole is centrally defined in the cylinder wall so as to be connected to a spray gun, the discharge hole being used to discharge the paint and the cleaning liquid.

Abstract: A radon decay product remover for use in a conventional, residential lamp. The remover screws into the light bulb socket of a lamp and provides a replacement socket for a light bulb. The flow of electric current to the light bulb is controlled by an on-off switch in the radon decay product remover. When used in a table lamp, an ion generator includes electrodes (from which negative and/or positive ions are emitted) that attach to the exterior of the lamp shade.

Abstract: Disclosed herein is a structure for preventing current from leaking out of devices such as a valve, an intermediate reservoir, etc., which are employed in an electrostatic spray coating apparatus for applying a desired voltage to electrically conductive paint so as to electrostatically spray-coat a workpiece therewith. The current-leakage prevention structure basically comprises any one of the devices each made of an electrically-conductive material, a container made of an insulating material, which accommodates the device therein and has a paint passage defined therein capable of communicating with the device, and a cover for externally covering the container. A creepage distance defined by the container and the cover is set to reach a desired creepage length or more capable of preventing current leakage. It is therefore possible to reliably prevent current from leaking even when a high voltage is applied to the devices.

Abstract: In an electrostatic paint spray gun having a built-in high-voltage cascade that is cast into an insulator member together with a transformer, a carrier tube is provided that is composed of a tube section and of an annular flange, whereby the electrical component parts of the high-voltage cascade are arranged and fixed at the outside jacket of the tube section and the output resistors are arranged and fixed at the annular flange. The inside bore of the tube carrier can serve as a receptacle for the high-voltage stranded electrode conductor.

Abstract: In an electrostatic spray gun, particularly a hand spray gun, for coating workpieces with liquid or powdery coating material, the integrated or atached high-voltage cascade comprises a carrier plate of sintered ceramic that is printed with interconnects and capacitor surfaces. The diodes of the high-voltage cascade can also be printed onto a corresponding carrier plate.

Abstract: An electrostatic coating apparatus for coating an electroconductive paint includes an electrostatic coating machine applied with a high voltage, a paint supply pipeline for supplying an electroconductive paint and a reciprocal pump disposed between the electrostatic coating machine and the paint supply pipeline and adapted such that the paint introduced from the input port is discharged at a predetermined flow rate from the output port of the pump and supplied at a predetermined amount to the electrostatic coating machine. The input port of the pump is made detachable from the paint supply pipeline. Electric insulation to paint supply pipelines can be saved. The reciprocal pump may be replaced with a paint charge pipe connected with a cleaning liquid supply pipe for supplying a cleaning liquid at a predetermined flow rate, thereby discharging the paint from the paint charge pipe.

Abstract: An apparatus and method for providing a charged fluid and for creating an electret from a receptor, such as roll mill polymer film, whereby the electret will have the highest possible static electrical charge within the physical limits of the receptor. The apparatus according to the present invention includes, inter alia, a housing, a plurality of equidistantly spaced electrodes, each electrode having optimum geometry, location and electrification voltage so as to provide a maximum, uniform electric field therebetween, the electrodes collectively forming a charger grid within the housing, and a source of flowing gaseous fluid entering into the housing, the flowing gaseous fluid ionizing at the charger grid, resulting in an optimized corona within the housing. The method according to the present invention induces an optimal corona, defined as a maximum possible electric field having a strength that is near the spark over voltage, in a flowing gaseous fluid by passing the gaseous fluid past the charger grid.

Abstract: The present invention constitutes a portable neubulizer capable of producing a finely divided aerosol having uniformly sized droplets. The nebulizer includes a source of fluid such as a capillary tube coupled to a fluid reservoir to which a high voltage is applied in order to generate the aerosol by electrical atomization. The nebulizer further includes a piezoelectric crystal and a mechanism for deforming the crystal so as to generate the required voltage. By using electrical atomization to generate the aerosol and by piezoelectrically generating the voltage required for atomization, a nebulizer is provided which may be of small size so as to be suitable for hand held operations yet is capable of producing measured amounts of finely divided aerosols which are substantially monodispersed.

Abstract: At least part of an electrostatic spraying installation for spraying an electrically conductive liquid product such as a coating product is grounded. The installation includes at least one intermediate storage tank that is electrically insulated from ground and at least one electrostatic sprayer device that is supplied from this intermediate storage tank. The electrostatic sprayer device is connected to a variable or switchable high-tension voltage source. The installation includes at least one electrical insulation device which incorporates a section of insulative conduit and a liquid inlet and a liquid outlet at respective ends of this conduit section. A piston movable in the conduit section scrapes its inside wall clean.

Abstract: An installation particularly suited to use in the automobile industry for electrostatic application of conductive coating product is partly at a high-tension voltage and partly grounded, these parts being separated by at least one temporary insulating device. The electrostatic sprayer is fed from a first storage tank insulated from ground and the latter is filled in a very short time period with coating product previously stored in a grounded second storage tank, through a temporary insulating device.

Abstract: A device and method of determining the voltage and current existing at the electrostatic electrode in a electrostatic spray gun, the spray gun containing a self-contained power supply including a turbine generator operating the air supplied to the gun, the power supply producing a low voltage d.c., and a voltage multiplier changing the voltage to a high potential which is applied to the electrode of the spray gun, a sensing and measuring circuit for determining the return current or ground current from the electrode to the power supply and producing a voltage directly related to the ground current and producing a voltage signal which may be measured directly to indicate the ground current; a circuit establishing a base voltage from the power supply for comparison against the ground current voltage signal and obtaining a differential voltage which may be measured and which is directly proportional to the electrode voltage.

Abstract: An electrical insulator device is in the form of a section of pipe for a conductive liquid. The device comprises an insulative casing accommodating a mobile assembly and an expandable pipe part is connected between one end of the casing and this mobile assembly, which carries ano-ring for scraping clean an end surface of a connection mechanism arranged in the vicinity of the second end of the casing, with which it cooperates.

Abstract: An apparatus and method for providing a charged fluid and for creating an electret from a receptor, such as roll mill polymer film, whereby the electret will have the highest possible static electrical charge within the physical limits of the receptor. The apparatus according to the present invention includes, inter alia, a housing, a plurality of equidistantly spaced electrodes, each electrode having optimum geometry, location and electrification voltage so as to provide a maximum, uniform electric field therebetween, the electrodes collectively forming a charger grid within the housing, and a source of flowing gaseous fluid entering into the housing, the flowing gaseous fluid ionizing at the charger grid, resulting in an optimized corona within the housing. The method according to the present invention induces an optimal corona, defined as a maximum possible electric field having a strength that is near the spark over voltage, in a flowing gaseous fluid by passing the gaseous fluid past the charger grid.

Abstract: An electrostatic paint spray gun having built-in high-voltage generator that is cast into insulating material is improved in that the dielectric strength is increased in the region of that face of the insulating member that is adjacent to the charging electrode. In a first solution, the high-voltage cascade is cast such into the plastic member for this purpose that its high-voltage output is situated adjacent the input transformer, whereby a small plug tube for the stranded electrode lead is additionally co-cast into the insulating member parallel to the cascade. In a second solution, an annular gap is left free between the stranded electrode lead and the insulating member, is filled with insulating oil and is sealed with a seal.

Abstract: A multi-jet print head for a continuous ink jet printer has its individual ink jets formed electrostatically instead of using a row of individual nozzles. Ink is supplied continuously through a slot in an electrically conducting body or to an elongated edge portion of such a body, while a strong electrostatic field is applied to draw off the ink as an array of parallel cusps. These break up at their tips to form a stream of ink drops which can then be deflected in known manner. The electrostatic field preferably has a reinforcing secondary field superimposed on it, which is cyclically varied at a suitable ink drop production frequency to synchronize formation of the ink drops at each of the cusp tips. This enables means for deflecting the drops to be synchronized with the moving drops for consistent deflections and corresponding optimum resolution.

Abstract: An apparatus and method for providing a charged gaseous fluid and for creating an electret from a receptor, such as roll mill polymer film, whereby the electret will have the highest possible static electrical charge within the physical limits of the receptor. The apparatus according to the present invention includes, inter alia, a housing, a plurality of equidistantly spaced electrodes, each electrode having optimum geometry, location and electrification voltage so as to provide a maximum, uniform electric field therebetween, the electrodes collectively forming a charger grid within the housing, and a source of flowing gaseous fluid entering into the housing, the flowing gaseous fluid ionizing at the charger grid, resulting in an optimized corona within the housing.

Abstract: A method in which ionization associated with fine wire or solid electrode systems causes mist droplets to charge and collect on electrode surfaces or at a region of highest electrical stress. The method includes manipulating droplet clouds to reach high stress regions. This process achieves improved electrical strength by depositing a mist in optimum locations before voltage applications.

Abstract: An electrostatic spray gun having an internal alternator-turbine power supply is provided with an air circuit which divides the air passages to the front end of the gun on one hand and to the power supply in the other hand at the trigger valve to prevent paint or solvent leakage into the power supply. The power supply is completely encapsulated or potted such that the only parts of the power supply extending through the containment are heat sinks, electrical connectors and a voltage indicator. Lastly, as C-clip is provided to attach the turbine alternator to the rest of the power supply which utilizes an interior groove on the alternator turbine and an exterior groove on the main body of the power supply.

Abstract: An electrocoating system with multistage voltage application includes an electrocoating bath filled with a coating material and having inlet and outlet sides, a feeding arrangement for supporting and moving an object to be immersed and coated in the electrocoating bath so that the object will serve as an electrode, electrode means including a plurality of voltage-application stages arranged successively from the inlet to outlet sides of the electrocoating bath, each of the stages having at least one electrode arranged along a path of travel of an object as moved by the feeding arrangement, power supply means for applying different independently variable voltages through the stages, respectively, and diode means for preventing the electrodes of the stages from being electrocoated with the coating material, the diode means including diodes which are forward-connected respectively between the power supply means and the electrodes of the stages.

Abstract: A continuous electrical connection between a high voltage power source and a paint charging electrode in an electrostatic spray gun. The electrode is mounted on a valve needle which is reciprocated by a trigger mechanism as the spray gun is operated. A novel spring establishes and maintains the electrical connection from a stationary contact on the gun barrel to the moving valve needle. The spring may be mounted on a spacer tube mounted coaxially about the valve needle. The spacer tube can move in an axial direction to exert a force on a seal between the barrel and the valve needle without affecting the electrical connection.

Abstract: In an electrostatic paint spraying installation or the like, a high-tension voltage generator comprises a voltage rectifier-multiplier in a mobile subsystem and a grounding connection in a fixed subsystem. A conductive wire connects an input terminal of the voltage rectifier-multiplier to the grounding connection. When the high-tension voltage generator operates, a high-frequency alternating current residual signal injected into this conductive wire is sensed and measured. The measured value is compared against a reference value that may be variable. The high-tension voltage generator is disabled if the difference between the measured value and the reference value reaches or crosses a predetermined threshold.

Abstract: A method and apparatus for insulating a spray liquid source from the high tension voltage of an electrostatic spray gun (13) when using an electrically conductive spray liquid. A spray liquid supply line (12) couples the spray liquid source to the spray gun and comprises an insulating device (14) in the form of a closed vessel (16; 26; 36) containing an electrically non-conductive liquid which is not mixable with the spray liquid and which has a density different from that of the spray liquid. A sprinkler nozzle (21; 31; 41) is arranged to disintegrate the spray liquid into separated drops which are transported through the insulating liquid (17; 27; 35) in the closed vessel at least by the influence of the difference in gravity acting on the two liquids. The separated spray liquid drops form a discontinuation of the electrical lead through which the high tension voltage propagates upstream through the supply line.

Abstract: A multiple print head for a continuous ink jet printer has its individual ink jets produced by an electrostatic field as an array of cusps along a straight edge to which the ink is continuously supplied. The straight edge is produced by folding an electrically conductive foil to give a surface less prone to corona discharges.

Abstract: A process for the production of solid particles, characterized by the solidification in flight of an electrically charged spray of fluid droplets of narrow particle size distribution, and an apparatus for that process comprising a sprayhead with a channel for the fluid communicating with an outlet; means for subjecting the fluid to an electrical field such that the fluid will move from the sprayhead under the influence of the field to produce a spray of the fluid, the means including means for applying a first potential to the fluid; an electrode mounted spaced from but adjacent to the sprayhead with means to apply a second potential to that electrode; and a spray chamber, so positioned that in use the sprayhead delivers the spray to the chamber interior, and provided with means to apply a third potential to the chamber, and so dimensioned and arranged that in use the majority of the spray droplets solidify before impinging on any surface of or within the chamber.

Abstract: An electrostatically aided coating dispensing system in which the high distributed capacitance of a high voltage cable for connecting the high voltage supply to dispensing device is entirely eliminated.

Abstract: Electrostatic spraying of a liquid from an applicator on to a substrate. Of primary importance for spraying ink from hand-held devices or in computer graphic work. The spraying is controlled by variation of a control electrode between an operative and an inoperative state; the control electrode, e.g. a needle, being positioned so as to affect the electrostatic field when activated and prevent spraying.

Abstract: An electronic safety device to prevent electrical arcing in electrostatic sprayer apparatus for spraying material such as paint comprises a device for generating a very low voltage AC signal in a fixed supply and control unit and a voltage step-up device in a mobile sprayer. A device sensitive to variations in the alternating current flowing in the conductors linking the generating device to the step-up device is connected to a disabling device capable, for example, of blocking the generating device when too sudden a current variation is measured, since such a current variation may precede electrical arcing.

Abstract: An electrode for use in a fluid-jet marking apparatus includes a flexible and tensionable electrode member mounted in confronting, substantially parallel alignment to a linear array of fluid droplet streams. The mounting of the flexible and tensionable electrode member is accomplished by a pair of mounting arms in spaced-apart relationship, one of the arms being pivotal while the other arm is immovable. The one pivotal arm is thus displaced relative to the other immovable arm so as to responsively tension the electrode member therebetween.In order to increase the vibrational frequency of the flexible and tensionable electrode member and/or to substantially decrease the vibrational amplitude thereof, at least one intermediate arm having a terminal end in operative contact with the electrode member is provided.

Abstract: According to the invention, the dipolar orientation of an object made of material adapted to present piezoelectric properties is obtained by exposing at least one of the faces of the object to a jet of charged microparticles in order to create therein a sufficient electrical field to obtain the said orientation, and in a variant of the invention, a direct polarization is carried out by displacing a film in front of at least one generator of charged microparticles, this invention applying in particular to the production of film in a piezoelectric polymer or copolymer.

Abstract: Control of high voltage is effected using apparatus having a high impedance generator, the output being connected to a first member of low radius of curvature and a second member. The two members are spaced apart by a gas gap so that when the voltage between them exceeds a threshold value corona discharge across the gas can occur. Such apparatus is particularly useful in controlling voltage and hence the size and size distribution of liquid droplets in electrostatic spraying apparatus.

Abstract: The invention is an electrostatic device which removes pollutants from an environment, by providing a spray of electrically charged liquid droplets. The device produces the charged droplets by directing the spray through an electrostatic charging head. The charging head includes two generally concentric rings having different resistivities. The resistivity of the outer ring is preferably at least ten times greater than that of the inner ring. The inner ring is connected to a power supply, and acts as the electrode for inductively charging the droplets. Because of its comparatively low resistivity, the inner ring can conduct some electric current, and can thus act as an electrode for inducing a charge on the droplets. The outer ring, having the higher resistivity, shields the inner ring, and reduces the risk of short circuits when the material has absorbed substantial amounts of moisture.

Abstract: In order to separate the dispersed phase from a continuous background fluid phase together forming a phase mixture (for example, contaminant particles from a continuous liquid phase), charge is injected into the mixture with a charge injection device (1) which issues charged mixture into a separation vessel (6) through a gas or vapor space (11). The injected charge induces an electric field within the liquid mixture in the vessel (6) which causes migration of contaminants towards the walls of the vessel (6) and precipitation on the wall surfaces. The clarified liquid is discharged from the vessel through outlet (7).The contaminant separation technique is effective and simple to achieve technically, and has the added advantage of operating effectively even with extremely small contaminant particle sizes, for example of the order of sub-micron or micron size.

Abstract: An electrostatic spray gun having an electrode for applying an electrostatic charge to coating material. A lever is provided for controlling both the flow of material from the spray gun as well as the position of a first magnet. The first magnet, in turn, controls a first magnetically actuatable electric switch for connecting and disconnecting a high voltage to the electrode. A second magnetically actuatable electric switch, controlled by the position of a second magnet, is electrically connected in series with the first switch, so that the high voltage can be disconnected from the electrode regardless of the position of the actuating lever. The spray gun can therefore be operated with or without the application of an electrostatic charge to the coating material.

Abstract: This invention relates to the fabrication of an improved electrode for an electrostatic atomizing device. The electrode consists of metal oxide-metal composite fragments dispersed and bonded in a metallic matrix. The composite fragments contain submicron metallic fibers uniformally arrayed in a nonconducting (insulating) matrix. The electrostatic atomizing device includes a cell having a chamber disposed therein, a discharge spray means in communication with the cell, at least two electrodes disposed in the chamber and being in liquid contact with the liquid in the chamber, the liquid in the chamber being transported to the discharge spray means and atomized into droplets, and a mechanism for generating by means of the electrodes, a charge through the liquid within the chamber, wherein the charge enamating from the improved electrode is sufficient to generate free excess charge in the liquid within the chamber, and the liquid is atomized into droplets.

Abstract: Electrostatic spraying apparatus wherein the liquid supply to the spray nozzle 20 is via a mechanical valve operated by an actuating member 12. Actuating member 12 is connected to a remote operating lever 3, which is preferably electrically conductive, via a connecting member 41 including an elastically extensible portion, e.g. a spring 39. Connecting member 41 is electrically conductive thus providing an electrical connection from lever 3 to the spray head.

Abstract: A spray gun for airless atomization and electrostatic deposition of a coating material upon a substrate, including a gun nozzle tip element serving to prevent arcing from the gun nozzle tip to an adjacent electrical ground. As disclosed, the airless spray gun includes a metallic nozzle tip from which atomized liquid coating material is emitted, and the thus-emitted coating material is charged by an electrode mounted on the nozzle which is electrically isolated from the metallic tip. During use of the spray gun, the metallic tip becomes charged via electrical charge conduction through the emitted atomized coating material. To prevent arcing from the charged tip to an electrical ground, a pair of resistive threads are secured in bores in the spray gun nozzle, each having a first end electrically connected to the conductive tip and a second end extending slightly beyond the nozzle.

Abstract: There is described an array of charging electrodes such as are used in ink jet printers. At least portions of the exposed surfaces of such electrodes, used to charge passing ink drops, are overcoated with a continuous coating substantially free of cracks of a semiconductive material doped to have a resistance, at room temperature, when measured transverse to the electrode, of between 10.sup.8 and 10.sup.11 ohms, such material being essentially insoluble in the ink.

Abstract: This invention relates to an electrostatic atomizing device and a process thereof for the formation of electrostatically charged droplets having an average diameter of less than about 1 millimeter for a liquid having a low conductivity wherein the device includes a cell having a chamber disposed therein, a discharge spray means in communication with the cell, the liquid in the chamber being transported to the discharge spray means and atomized into droplets, and a mechanism for passing a charge through the liquid within the chamber, wherein the charge is sufficient to generate free excess charge in the liquid within the chamber.

Abstract: Portable electrostatic spraying apparatus having a low stored energy wherein the capacitor of the high voltage circuit is formed by the capacitance between a lead connecting the high voltage generator output to the spray nozzle and a lead connected to the other side of the generator output.

Abstract: Electrostatic spraying apparatus e.g. for graphic work, having a hand or finger held body carrying a nozzle to which the atomizing potential is applied from a high voltage generator. The nozzle is of the non-drip type, e.g. a capillary bore or a felt- or fibre-tip so that no liquid is dispensed therefrom in the absence of the atomizing potential. The nozzle and liquid reservoir may be a cartridge, e.g. a felt-tip graphic marker. The generator may be within the body so as to provide a self-contained unit which can be "earthed" via the user's hand.

Abstract: An electrostatic spray coating device in which a coating material passes through a tube in a body and is electrostatically charged by electrodes as it exits the body. In the body is mounted a bar transformer for providing a high voltage to the electrodes. A magnetic conductor bar, such as a ferrite core, is also mounted in the body outside the bar transformer for conducting magnetic flux between its ends, thus providing a flux circuit within the body. If more than one conductor bar is used, the bars are spaced to facilitate heat discharge. A multiplying and rectifying circuit such as a Greinacher circuit may also be mounted in the body between the transformer and the electrodes, with its components distributed around the tube.

Abstract: A pneumatic system is disclosed for regulating the acceleration and running speed of an air turbine and alternator used in electrostatic spray apparatus having a self-contained electrical power supply. The air turbine includes a rotor which is arranged to be biased in a first direction of rotation by a flow of impinging drive air and in a second opposite direction by a flow of impinging brake air. The flows of air cooperatively result in rotation of the turbine in a desired direction of operation and enable a minimized period of acceleration for a predetermined running speed.

Abstract: Electrostatic spraying for pesticides comprises an electrically conducting or semi-conducting surface; means for supplying liquid adjacent the surface; and a field intensifying member in close proximity to the surface. A process for the ultra-low volume application of concentrated pesticidal formulations by means of the apparatus is also described.

Abstract: A method and system for the abatement of fog in a designated air space over an aircraft approach zone and runway, consisting of gapped air jets laden with electrically charged droplets of low mobility, a ground corona guard in the form of a shallow water-and-oil basin, and a charged-collector-drops emitting device on the ground, arranged in such a manner that the low-mobility charged droplets blown aloft by the air jets form a virtual electrode suspended at appropriate height above the ground, toward which the oppositely charged high-mobility collector drops move, thereby collecting the neutral fog drops in their paths. The perforation ratio of the gapped air jet array is chosen such that the wind flux which penetrates the jet array is substantially equal to the entrainment flux at the lee side of the jets, thereby providing for a virtual canopy over the spatial region in which the fog is to be abated.

Abstract: An agricultural chemical sprayer is disclosed using special pre-coded machine-readable chemical containers which, when attached for use, become an integral part of an automatic spray control system. The pre-coded data derived from a given container effectively prevents unauthorized and unsafe container refilling operations and, at the same time, automatically provides optimum control over the spray application rate (pump operation and/or electrostatic voltage), prevents mixing of incompatible spray solutions, prescribes proper spray system flushing procedures, and at all times after filling maintains an irreversible account of the available liquid remaining in the container. Provisions are made for monitoring the condition and/or operation of each spray nozzle and special connectors are provided for effecting optimum liquid and electrical circuit connections in such a system.

Abstract: In a supersonic nozzle, a current of compressed air charged with humidity is expanded to produce an aerosol of ice micro-particles. A corona discharge is maintained at the neck of the nozzle at the tip of a tapered electrode by a high alternating current voltage supply connected between the electrode and the nozzle body. The alternately positive and negative ions produced by the discharge are trapped by the ice micro-particles and ejected by an orifice at the front of the nozzle out of the enclosure in the direction of a space zone the concentration in charges of different signs of which it is desired to raise. The electric supply comprises a capacitor in the circuit between the electrode and a conductive guard ring which is embedded in the body of the nozzle behind the insulating surface thereof. Thus fluxes of positive and negative particles which are overall balanced are obtained at the exit of the nozzle. The apparatus is well adapted to the elimination of static charges of electrified bodies.

Abstract: A liquid container adapted to form part of an electrostatic spraying apparatus and having attached to it a high voltage generator to supply the voltage required for the electrostatic spraying. The container and apparatus also include the electrical contacts necessary to connect the generator to an electrical power supply and to the electrostatic spraying apparatus.

Abstract: A holder for receiving a container which contains a liquid suitable for electrostatic spraying and which has a spray orifice comprises a body having a high voltage generator; a power source therefor; a field-intensifying electrode; electrical connections for connecting the electrode to an output terminal of the high voltage generator and for connecting the output terminal and the field-intensifying electrode to earth; a mounting device complementary to a mounting device on the container for locating the container on the holder with the spray orifice adjacent the electrode, the complementary mounting device having an electrical contact complementary to one on the container; and electrical connections for connecting the contact to the other output terminal of the high voltage generator.

Abstract: A system for separating solid particles from the combustion products of coal in which high temperature, high pressure flue gas containing the particles is directed tangentially into a cyclone separator so that the relatively large particles are driven by centrifugal forces to the inner wall of the separator. Electrical charges generated at ambient temperature are blown into the cyclone separator via aerosol charge-carriers which charge the relatively small particles in a manner so that the small charged particles are attracted to the wall, which is of an opposite polarity, and are scrubbed off the wall by the larger particles. A double-cone flow regulator is positioned in the path of the aerosol charge carriers and the particles to direct the carriers and particles toward the inner wall. An outlet is provided at the lower portion of the cyclone separator for discharging the separated particles and an additional outlet is provided for discharging the clean gas.

Abstract: A method and apparatus for creating electrostatic field by forming a high resistive anodic-oxidized film on an electrostatic electrode and applying thereto a high voltage direct current including high frequency component resonatable with inherent resistance and capacitance in the high resistive film.