Abstract: An endless belt-shaped dust collecting electrode is extended around a pair of rollers disposed within a casing, discharge electrodes are disposed within a chamber formed between the upper side portion and lower side portion of the endless belt-shaped dust collecting electrode, end portions of a hanger support for the discharge electrodes project to the outside of the casing through gas communication ports formed in the casing, and these end portions of the hanger support are fixedly supported and electrically insulated from the outside of the casing, whereby insulation between the discharge electrodes and the dust collecting electrode can be improved even when electrically conductive dust is collected.

Abstract: In an electric dust collector including a case having a dust-containing gas inlet and a clean gas outlet; a charging section for electrically charging the dust particles by means of the corona discharge on the side of said dust-containing gas inlet of said case; a collecting section for collection the dust particles passing through said charging section and electrically charged, by means of the Coulomb force; and a d.c. high voltage power source for applying a d.c.

Abstract: In a device for electrically charging particles, a pair of parallel plasma generators are spaced from one another, each of the generators having corona discharge electrodes. A main field forming source of high AC voltage is connected between the plasma generators, to form a main field in the charging space, and intermittently operating corona generating high voltage power sources are coupled to apply high voltages to the respective corona discharge electrodes only when the plasma generators have relative specific polarity, whereby only particles of one polarity are driven into the charging space. The intermittent corona generating high voltage source has a frequency equal to or greater than the frequency of the AC voltage which provides the main AC field.

Abstract: A plurality of wire-shaped electrodes are arrayed at equal intervals within a plane insulator layer, and an electric power source for applying an A.C. voltage between adjacent ones of electrodes is connected to the electrodes via protective resistors so that an electric field in a curtain form is established between respective electrodes. The resistance value of the protective resistors between the electric power source and the electrodes and the resistance of the electrodes themselves are respectively selected higher than a minimum A.C. ignition resistance that is necessary for preventing ignition by spark discharge of powder to be processed by the curtain-like electric field. This prevents powder explosion induced by a spark discharge caused by a fault occurring in one part of the electric field curtain.

Abstract: An improved pulse-charging type electric dust collecting apparatus is described herein, which comprises dust collecting electrodes and high corona-starting-voltage discharge electrodes disposed in opposed relationship to the dust collecting electrodes, both electrodes being arranged within a main body casing having a gas inlet, gas outlet and a dust exhaust port. An adjustable D.C. high voltage power source establishes a principal electric field between the electrodes, and an adjustable varying voltage power source having an adjustable magnitude, waveform width and repetition period is connected in series to the adjustable D.C. high voltage power source. After having intensely charged dust particles floating in a dust-containing gas introduced between the respective electrodes through the gas inlet by bombardment with the ion current under the high principal electric field, the dust particles are subjected to strong Coulomb's forces to be effectively adhered onto the dust collecting electrodes.

Abstract: An electrostatic powder painting apparatus has a cyclone structure for directing powder paint toward a surface which is to be painted. The cyclone structure includes a feed cylinder having an open outlet through which the powder paint is delivered toward the surface to be painted, this feed cylinder having an outlet which is spaced from the outlet and which is adapted to receive air and powder paint suspended therein. The air is given a whirling motion within the feed cylinder so that the powder paint suspended in the air is centrifugally advanced along the inner surface of the feed cylinder from the inlet toward the outlet thereof, a conduit communicating with the inlet to supply thereto air with powder paint suspended therein. An exhaust cylinder, whose diameter is smaller than the feed cylinder, communicates coaxially with the feed cylinder to discharge air from the interior thereof.

Abstract: In a pulse power source for applying a pulse voltage to a capacitive load; a series resonance circuit capable of generating transient oscillation is formed of the capacitive load adapted to be applied with the pulse voltage, an inductance for generating transient oscillation and a power source capacitor; the capacitive load is charged from the power source capacitor by first closing one of two switch elements provided in the midway of the resonance circuit, that is, a load charging switch element to make the voltage across said capacitive load rise up to about twice the voltage across the power source capacitor after a period equal to about 1/2 of a transient oscillation period of said series resonance circuit, to form a rising edge of the desired pulse voltage; then reversely, the power source capacitor is charged from the capacitive load by closing the other switch element, that is, a charge recovering switch element after first said one switch element has been closed to make the voltage across said capacit

Abstract: A particle charging device is herein disclosed in which discharge electrodes and opposite electrodes are disposed in an opposed relationship, third electrodes being provided in the proximity of each said discharge electrode, and there are provided a high voltage source for applying a periodically varying high voltage between said discharge electrodes and said third electrodes, a D.C. voltage source for applying a D.C. bias voltage between the above described electrodes, and a D.C. high voltage source for applying a D.C. high voltage between said third electrodes and said opposite electrodes, whereby during the periods when the periodically varying high voltage is not applied between said discharge electrodes and said third electrodes, D.C. corona discharge originating from said discharge electrodes may be always suppressed. Also an electric dust collecting apparatus making use of said particle charging device is disclosed herein.

Abstract: A turned-over or inverted section is formed at one end of a flexible, fluid impervious tube by turning the tube inside out and folding it back up on itself. With the turned-over end inserted in a pipe or conduit, the folded over end is secured to the pipe and then a fluid differential is created between the inside of the tube in the pipe and the inside of the pipe ahead of the tube which differential is great enough to cause the turned-over end of the tube to migrate along the pipe from one end to the other by drawing the tube into the pipe from the end which is not attached to the pipe. In this manner, a flexible tube can be installed in a pipe irrespective of the complex configuration into which the pipe is bent or the variations in cross-sectional shape which may exist along the length of the pipe. The disclosure also includes an apparatus providing a pipe engaging means for forming the inverted end of the tube and sealing it to the end of the pipe.

Abstract: An improved electrostatic powder painting apparatus is described herein, in which in the vicinity of a discharge electrode disposed in opposition to a body to be painted there is separately provided a driving electrode, for establishment of a driving electric field. The generation of a mono-polar ion current is achieved by said discharge electrode, so that the driving electric field and the ion current density may be controlled quite independently of each other, whereby generation of inverse ionization can be prevented perfectly, while a maximum amount of electric charge can be given to paint powders and a maximum driving force is acted upon said paint powders.

Abstract: An electric dust collector apparatus is disclosed herein; which comprises an inlet port for dust-containing gas, a main body duct of said electric dust collector, an outlet port for clean gas, and an exhaust port for collected dust; a plurality of channel-shaped collector electrodes disposed at an equal interval and in parallel to each other along a plane transverse of a gas flow within the main body duct with their opening directed to an upstream side; a plurality of channel-shaped driver electrodes disposed upstream of said collector electrodes at an equal interval, along a plane transverse of the gas flow within the main body duct in a staggered relationship to said respective collector electrodes, in parallel to each other and to said collector electrodes and as insulated from said collector electrodes with their openings directed to a downstream side; a plurality of corona discharge electrodes disposed midway between adjacent ones of said driver electrodes in parallel thereto and opposed to inner surface

Abstract: A particle charging device is herein disclosed in which discharge electrodes and opposite electrodes are disposed in an opposed relationship, third electrodes being provided in the proximity of each said discharge electrode, and there are provided a high voltage source for applying a periodically varying high voltage between said discharge electrodes and said third electrodes, a D.C. voltage source for applying a D.C. bias voltage between the above described electrodes, and a D.C. high voltage source for applying a D.C. high voltage between said third electrodes and said opposite electrodes, whereby during the periods when the periodically varying high voltage is not applied between said discharge electrodes and said third electrodes, D.C. corona discharge originating from said discharge electrodes may be always suppressed. Also an electric dust collecting apparatus making use of said particle charging device is disclosed herein.

Abstract: A particle charging device is herein disclosed in which discharge electrodes and opposite electrodes are disposed in an opposed relationship, third electrodes being provided in the proximity of each said discharge electrode, and there are provided a high voltage source for applying a periodically varying high voltage between said discharge electrodes and said third electrodes, a D.C. voltage source for applying a D.C. bias voltage between the above described electrodes, and a D.C. high voltage source for applying a D.C. high voltage between said third electrodes and said opposite electrodes, whereby during the periods when the periodically varying high voltage is not applied between said discharge electrodes and said third electrodes, D.C. corona discharge originating from said discharge electrodes may be always suppressed. Also an electric dust collecting apparatus making use of said particle charging device is disclosed herein.

Abstract: Apparatus for removing dust from a gas stream comprises a duct with an inlet at its top, a hopper spaced beneath the inlet, and a lateral outlet at a level between inlet and hopper. Gas flowing from inlet to outlet must traverse a vertically extending filter comprising elongated parallel electrodes laterally spaced from one another at small intervals. Each electrode is connected with a terminal of an alternating voltage source different from that with which its adjacent electrodes are connected. The constantly varying alternating electric fields at the filter repel particles so that they fall into the hopper.