Abstract: The invention concerns the cleaning of the granulate filter bed material of a gas filter. The granulate material is contained in the spaces between two or more gas-permeable walls. The walls are designed as vertical tubes which may be cylindrical or consist of two cones with their bases together. The crude gas passes transversely through these walls from an outer chamber into an inner chamber from where it is led away as purified gas. A transfer pipe runs from the bottom of the filter bed to the top. A current of conveyor air is forced through the transfer pipe so that it carries the granulate material from the bottom to the top of the filter bed. At the top of the filter bed the conveyor air escapes through a gas-permeable hood while the granulate material falls into the space(s) between the gas-permeable walls, passes down between the walls and eventually reaches the bottom of the filter bed again.

Abstract: Serum-Plasma separator and transfer apparatus comprising a tube and a hollow stopper-like member fitted into the open end of the tube. The top end of the stopper is of a flexible material with a weight positioned thereon. A rigid capillary tube with one end in the hollow stopper and the other end joined with a flexible capillary tube which, in turn, has its other end attached to a weighted filter. The capillary tube has a port in its side wall at the lower end adjacent the filter. As the serum is centrifuged the weighted filter drops into the tube causing the sample liquid to pass through the filter into the upper portion of the tube. At the same time the weight of the filter forces the flexible capillary tube to extend downwardly thereby opening the port in the capillary tube into the liquid sample. As the centrifuging action slows down, the weight on the stopper tend to return to its normal position.

Abstract: Gas bearing particles is cleaned by bringing it together with a friction-electrically charged mist of water droplets, which is formed by the aid of an electrically conducting liquid mist generating nozzle to which water in liquid state which has been de-ionized to a conductivity of at most about 1 .times. 10.sup.-5 ohm.sup.-1 cm.sup.-1, is supplied. From this nozzle the charge of a polarity opposite to that of the mist is continuously conducted away.

Abstract: A process and apparatus is disclosed for the removal of pollutant material including solid or liquid particulate matter and gaseous pollutants from gas streams in which the gas is driven through a mixing tube by forming a jet of a compressible fluid such as steam or air or the whole or a part of the polluted gas itself. In some instances the jet acts as an ejector to induce flow of the polluted gas into the mixing tube but when all of the polluted gas is formed into a jet it is directed into the mixing tube without any ejector action. A mechanically atomized liquid is introduced into the outer region of the jet of compressible fluid emerging from the nozzle in which the jet is formed. The mechanically atomized liquid is further atomized by the shearing action of the jet to form high velocity droplets which are intimately and turbulently mixed with the pollutant-containing gas and retained in the mixing tube for a sufficient time so that the pollutants become entrained with the water droplets.

Abstract: A vortex separator is provided having an annular contaminant chamber for receiving centrifugally separated particles, and a baffle at the entry to or in the annular chamber, to inhibit the whirling of particles retained therein, to prevent abrasion of the walls by the spinning particles, while not interfering with the entry of the particles into the annular chamber.

Abstract: A droplet separator for removing liquid droplets from a gas stream entraining same, comprises a stack of corrugated plates having a given crest-to-crest spacing which can be represented as a wavelength .lambda. and collecting pockets at each crest having inlet slots opening into the oncoming gas stream. Each plate consists of a plurality of plate members whose length, measured parallel to the wavelength measurement, is greater by the distance of the overlap of these plate members at each crest than n .lambda./2 where n is 1/2 or 1.

Abstract: An electrostatic air cleaner includes a casing adapted to be mounted in a ceiling or sidewall between ceiling joists or sidewall studs, the casing having an adjustable outlet, a grille and pre-filter detachably connected to its inlet or room side, and an ionizing and collector cell mounted therein for convenient removal or replacement. The cell is detachably pivoted at one end in the casing so that it may be swung outward when removing it from the casing.

Abstract: Mobile vehicles and the like having enclosed cabs such as tractors, combines and the like, are provided with air inlet means for the comfort of the operator. The air inlet means are provided with a readily removable filter element and means to support the same by an overhanging forward portion of the roof which extends beyond the windshield of the cab. The filter element is supported by a frame and includes means to raise and lower the frame respectively to support the filter element in upper, operative position and lower, removable position, insertion and removal of the same occurring through an opening adjacent one side edge of the roof of the cab and normally closed by a door, the entire removal occurring exteriorly of the interior of the cab.

Abstract: In a device for causing contact between horizontally-flowing gas and vertically-flowing liquid, a stack of corrugated contact plates in face-to-face contact and having their corrugations inclined to the horizontal plane. Alternate plates of the stack are inclined upwardly in the direction of gas flow and the intermediate plates are inclined downwardly at the same angle of inclination. The upwardly-inclined corrugations have a smaller radius of curvature than the downwardly inclined corrugations. The heights of the respective corrugations are preferably equal and the radius of curvature in the upwardly-inclined corrugations is less than the height of said corrugations.

Abstract: An air cleaner of the oil-bath type, in which dust-laden air at high velocity in a stream entering the unit is first mixed with an oil spray and then impinged on an oil washed deflector for directing the mixture outwardly and upwardly through a filter bed to wet the filter bed with oil for catching dust carried by the air, surplus oil being drawn by venturi action from the filter bed and sprayed back into the entry stream for recirculation into the filter bed, and the air cleaner having a dual-chamber oil reservoir and dust collecting means, a novel venturi means, and a mechanical agitator in the air inlet to prevent the accumulation of dust therein.

Abstract: Holder for an annular filter includes a support frame or basket with a flared portion at its upper end which cooperates with the inner leg of an inverted U-shaped sealing ring to clamp the upper end of the filter. The sealing ring has its outer leg seated on a sealing gasket positioned on top of a support plate surrounding an aperture through which the filter is lowered during operation of a particle collection apparatus. The holder is replaceably sealed in position by screwing a pair of threaded rings together to force the flared portion downwardly. The diameters of the various parts are larger than the aperture to prevent them from being dropped through the aperture and the overall design is such that the filters can be replaced from the upper clean side of the collection apparatus rather than the lower dirty side.

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 improved air cleaner having a filter specially adapted for ready insertion and removal without tools, and for improvement of the seal against direct air flow between the inlet and outlet of the cleaner.

Abstract: A gas filtering device of the type having a pleated filter media for filtering a gas stream passing through the media from the upstream side to the downstream side of the filter device, a peripheral frame surrounding and attached to the margin of the pleated filter media, a filter media reinforcing device comprised of an elongated rigid beam disposed within a pleat of the pleated filter media and extending the entire length of the pleat, and filter media retaining means attached to the rigid beam and extending across the downstream side of the filter media.

Abstract: An air cleaner is provided having an inlet and a concentric outlet passage. Means is provided for imparting a whirling motion to the air as the air enters the inlet. Provision is made for varying the size of the inlet so that the velocity of the air may be adjusted for different engine speeds. Turbine vanes are driven by the whirling air and drive blower vanes which assist centrifugal force in directing dust particles toward a particle outlet in the chamber wall.

Abstract: A hydrocyclone separator has a tangential inlet comprising an inlet nozzle that accepts a mixture to be separated and a diluting liquid. The inlet is at one end of the hydrocyclone and a heavy fraction outlet is at the other end. The inlet nozzle introduces the diluted mixture into the hydrocyclone with a flow component directed toward the heavy fraction outlet. The hydrocyclone has a light fraction outlet at the same end as the inlet.

Abstract: A method and apparatus for fractionation with hydrocyclones for providing the relative sharp separation between separate meshes being divided, by cumulating a slurry-fill as a regulative bulk measured variable below a lower reject nozzle, and adjusting the clearance between the surface of the slurry-fill and the lower edge of an overflow adjusted to a predetermined length which is reversely proportional to a desired separation mesh by means for changing or retaining constant the fill level of the slurry fill.

Abstract: The foam cleaning system for an electrostatic precipitator includes a source of a suitable detergent and means for introducing it into a foamer, a source of supply water which is piped through a water pressure reducing valve if necessary and then through a pressure gauge and solenoid valve control and through a suitable filter into the foamer, and a supply of compressed air which passes by suitable conduit through an air pressure regulator and solenoid valve control into the foamer. The detergent, water and air are suitably combined in the foamer and discharged therefrom as a foam into a manifold which will carry the foam to the electrostatic precipitators to be cleaned. The foam is introduced into a space provided at the top of the precipitator above the ionizer and collecting cell plates, between the inlet and outlet filters, and between the side wall of the precipitator. A drain is provided adjacent the precipitator.

Abstract: To capture fine particulate matter in a gas such as air, a dielectric fluid is directed to the center of whichever face of a rotating disc is exposed to the air flow. The disc is comprised of two or more segments which bear opposite electrostatic potentials. As the dielectric fluid is centrifuged towards the periphery of the rotating disc, the fluid becomes charged to the same potential as the segment over which it is passing. Particulate matter is attracted to the charged segment and is captured by the fluid. The fluid then carries the captured particulate matter to a collection device such as a toroidal container disposed around the periphery of the disc. A grounded electrically-conductive ring may be disposed at the outer periphery of the disc to neutralize the captured particles and the fluid before they enter the container.

Abstract: A scrubber for blast furnace gas has a primary purifying unit and a secondary purifying and pressure adjusting unit in series with the primary unit. The primary purifying unit includes venturi having a divergent-constant diameter-convergent core in which the gas experiences a pressure loss and is subjected to a first washing with water. The secondary purifying unit comprises a multi-stage venturi including a first stage having a constant-diameter annular passage, followed by a diffuser section and at least one adjustable stage in series with the first stage which defines an annular passage of variable size.