Abstract: A cyclic or periodic event timing system for use in conjunction with a pressure fluid control circuit includes a cylinder and piston type actuator comprising a differential area piston which is exposed to fluid pressure from a flow conduit on opposite sides of a flow restricting orifice in the conduit or a branch portion thereof. The actuator piston includes a rod portion which is extended in one direction in response to an unbalanced pressure force on the piston. On the extension stroke, the actuator opens a valve to effect flow in the conduit resulting in a reduction in pressure which is sensed in the cylinder chamber exposed to the larger piston fluid area. The actuator piston then returns to an initial retracted position in response to an unbalanced pressure force.

Abstract: A device for filtering dust from air drawn by apparatus from a factory shop or building, for example a steelmaking shop, including a plurality of dust extractors which have a total capacity at least equal to the air throughput of the drawn air. The extractors have regulators by which they can be regulated individually or in groups. Preferably each extractor is associated with an individual dust extractor and also each extractor preferably has its own individual cleaning system. The extractors are preferably of the dry filter bag type.

Abstract: A vertical media bed dust collector in which the media bed of a filter panel is rejuvenated when necessary by interrupting the gas flow through the panel, withdrawing the filter media from the panel, separating the agglomerated dust from the filter media, returning the filter media to the filter panel, and reestablishing the gas flow through the panel. The system further includes apparatus for removing collected dust from the separating and recirculating surfaces of the media handling apparatus and also from the remote face of the filter panels before the cleaned gas is allowed to pass out of the collector so that the cleaned gas is not recontaminated by small amounts of dust adhering to those surfaces.

Abstract: A device for collecting and burning particulates in exhaust gases from an internal combustion engine comprises: a casing having an inlet port and a discharge port for exhaust gases; at least one trapper of porous and heat resistant material disposed within the casing; and a plurality of electric heaters separately disposed a predetermined distance apart from each other on or adjacent to a surface of the trapper which confronts the inlet port and connected to a power source, each of said electric heaters having a predetermined heating area. This device effectively collects and burns particulates in exhaust gases with reduced amount of electric power.

Abstract: An exhaust gas cleaning device for an internal combustion engine comprises a housing provided with an inlet port which is communicated with an exhaust pipe of an internal combustion engine and an outlet port, two particulates collecting members disposed in two independent exhaust gas flowing passages which are communicated with the inlet port through an inlet chamber and with the outlet port through an outlet chamber, a butterfly valve provided in the inlet chamber for alternately directing the exhaust gases into either one of the exhaust gas flowing passages and a heated air supplying means for burning off the particulates collected by the particulates collecting members, which is provided with a heated air outlet port opening into the inlet chamber so as to be opposed to the inlet port with the butterfly valve therebetween.

Abstract: This disclosure relates to a dust control apparatus including mobile drilling rig having a peripheral skirt which collects dust during a drilling operation and delivers the same to a dust collector having a chamber housing and a plurality of filters, each filter being cleaned by a high pressure air line through an appropriate solenoid valve and a sequencing control circuit for operating the solenoid valves to sequentially deliver high pressure air into the filters so that the dust collected thereon can be blown therefrom dropping into the chamber and outwardly therefrom through a discharge opening.

Abstract: A device is described for filtering zinc powder from an airstream which is exhausted from a galvanizing process. The device comprises an enclosed chamber to which the airstream is circulated for removal of zinc powder. The chamber has a horizontally disposed bottom surface in which there is a plurality of circular openings which are equally spaced about a vertical center axis and which lead to vertically disposed bag-type filters. An arm is coupled to a vertical drive shaft which is rotatable about the center axis. The arm is designed to move a circular cover from opening-to-opening to individually seal the openings from the chamber, so that the filters can be cleaned of zinc powder. The cover is freely mounted on the distal end of the arm such that the cover is supported on the bottom surface of the chamber as it moves in an arcuate pathway between the filter openings.

Abstract: A method and apparatus for purging hot flue gases from one or more of the filter compartments in a baghouse installation wherein heated ambient air is admitted to the reverse air system of the installation which directs the ambient air into the compartments to purge the gases from the compartments.

Abstract: A method and apparatus for isolating one or more of the filter compartments in a baghouse installation wherein an air damper is provided on each of the compartments to admit heated ambient air into each of the isolated compartments to prevent flue gases from seeping into the compartment.

Abstract: Vacuum sweep apparatus in an air-filter system which includes a horizontally disposed plate having an array of openings, a plurality of filter bags mounted on the upper side of the plate and communicating with the openings, and a vacuum sweep arm mounted for rotation below the plate. The apparatus includes a base conduit mounted on the arm, in fluid communication therewith, a head conduit, and a flexible, fluid-tight skirt joining the base and head conduits in sealed fluid communication. The skirt accommodates limited multidirectional movement of the head conduit with respect to the base conduit. The head conduit is biased toward the plate so that, as the sweep arm is rotated, an apertured plate-contact member carried on the head conduit is pressed against the plate to seal the air-flow passages formed by successive registries between openings in the plate and an aperture in the plate-contact member.

Abstract: A method and apparatus for isolating one or more of the filter compartments in a baghouse installation wherein an inlet damper having a pair of spaced closure members is provided in the inlet duct of each of the compartments. When the inlet damper associated with one of the compartments is closed to isolate the compartment, the closure members seal off the inlet duct to form a chamber within the duct which is vented to the atmosphere through an air damper adapted to admit heated ambient air into the chamber to prevent the flue gases from seeping into the compartment.

Abstract: Fibers and lint floating around a spinning machine are aspirated into a system comprising a plurality of filter boxes, each filter box being divided by a screen into a lower raw-air compartment and an upper clean-air compartment, the latter containing a blower serving to circulate incoming air from the screen to a normally open discharge duct. The raw-air compartment has a permanently open intake duct for the aspirated air and is further provided with a normally closed suction duct communicating with a central exhauster common to a group of such filter boxes. From time to time, or when a sensor detects an excessive pressure in the raw-air compartment due to accumulation of solids on the entrance side of the filter screen, the suction duct is opened and the discharge duct is closed whereby the solids are enabled to drop off the screen for removal by the exhauster to a central receptacle.

Abstract: An environmental enclosure or clean room composed of a structural frame which supports a flexible transparent plastic film which defines a sealed chamber or room. Air is introduced into the chamber through a two-stage filter system and is exhausted through a filter duct. Located adjacent the chamber is a small entry compartment, and the entry compartment has sealed doorways leading to the exterior and to the interior of the sealed chamber respectively. To inspect objects in the sealed chamber, the operator enters the entry compartment and puts on a hermetically sealed suit that is normally stored in the compartment. With the operator sealed within the suit, the entry compartment is sterilized and the operator can then enter the main chamber. The suit has a provision for receiving air from the outside and for discharging air from the suit to the exterior of the chamber.

Abstract: The invention relates to filtration apparatus and to a process for a filtration installation comprising several filtration cells equipped with at least one filtering element through which passes a current of dust-laden gas, this process consisting in isolating the filtration cell to be declogged, then in proceeding with declogging the filtering element(s) of this cell, and wherein further, after having isolated the filtration cell and before proceeding with the declogging thereof, it is scavenged by a counter-current of an inert gas, this counter-current scavenging being carried out under conditions such that the inert gas completely renews the atmosphere of this cell, without causing the layer of dust deposited on the upstream face of the filtering element(s) of said cell to be detached.

Abstract: A method of controlling the cleaning process for the cleaning of textile barrier filters, for example bag filters, subsequent to dust precipitation on the filter material. The cleaning is carried out with a cleaning system (14) comprising means (16,17,18) for distributing compressed air pulses to the filter bags (4). The gas flow often shows great variations in flow, temperature and dust content, thereby giving rise to problems in the control of the cleaning process in such a manner, that neither over-cleaning nor under-cleaning occurs. For the control, the filter load v.sub.f is measured which is the ratio of the gas flow (m.sup.3 /s) and the filter area (m.sup.2), as well as the pressure drop p.sub.f over the filter material. In applications with great temperature variations of the gas, also the absolute temperature T is measured. The measuring results are processed in an electronic unit (26) for calculating the filter resistance S, which is the ratio p.sub.f /v.sub.

Abstract: Powder collectors for the automatic collection and recycling of powders such as in a powder coating booth are disclosed. The collectors utilize a rollaway collection assembly having one or more cartridge filters therein so as to allow the quick change of vector assemblies on the coating booth for color change convenience. The cartridges themselves may also be readily changed as they preferably are not rigidly mounted to the collection assembly but instead merely sole positioned therein as to become functional upon turning on the air flow for the collection system. Continuous operation is provided by periodic blow-down of the cartridges with a fluidized bed providing automatic recycling (or disposal in the case of dust collection systems) of the collected powder. Various embodiments are disclosed including one embodiment utilizing envelope filters with an automatic blow-down provision.

Abstract: A self-regenerating diesel engine exhaust particulate filter comprising, in a preferred embodiment, porous ceramic walls defining filter surfaces between adjacent inlet and outlet passages and having electric heating wires in the inlet passages to periodically initiate incineration of collected particulates therein. A movable shield is preferably provided to restrict gas flow through the various passages during their respective periods of incineration so as to provide periodic regeneration with a minimum expenditure of external energy.

Abstract: A cleaning arm for a cylindrical baghouse pivoting centrally of the clean air plenum with a cam controlled valve to provide backflushing air to successive concentric rings of filter bags with each full revolution of the cleaning arm.

Abstract: A dust separator which has an inlet enclosure having an inlet for dust-laden gas, an outlet enclosure having side walls and connected to a pipe for discharging the dust-freed gas, a separating wall separating the inlet and outlet enclosures, several elongated filtering elements disposed in the inlet enclosure, each element having a longitudinal axis and an opening at the end emerging into the outlet enclosure, and at least one nozzle having an orifice which has an axis for blowing counter flow declogging gas into the outlet enclosure and into the filtering elements. The axis of the nozzle orifice is directed transversely to the axes of the filtering elements and obliquely to the surface of one of the side walls of the outlet enclosure.

Abstract: Apparatus for filtering a gas stream including a common manifold to which, in use, gas to be filtered is passed, a plurality of gas outlets from said manifold, a plurality of particle separators adapted to remove particles from said gas stream prior to exiting from said gas outlets and wherein said particle separators are adapted to deliver particles separated from said gas stream to said manifold, and a particle outlet from said manifold.

Abstract: In an air cleaner device for removing dust or other particles from air, and including a filter system of a circular line of filter bags through the walls of which the air is forced into the interior of the bags, an apparatus for removing accumlations of filtered-out particles adhering to the outer surfaces of the filter bags by introducing a flow of cleaning air in the reverse direction into the interior of the filter bags. The particle removing apparatus includes a circular line of tubes connected to a source of cleaning air and spaced from and registering with the top ends of the filter bags. The open ends of the tubes are closed off and sealed by a sealing plate which is motor driven for slow rotation.

Abstract: A filtering separator, in particular a pocket or tube filter, of the kind in which smoke-laden gas containing dust particles of particularly great adhesiveness is fed into a dust collecting trough of a filter housing at the bottom and upwards towards filter elements and in which the filter elements are cleaned periodically by counter-current scavenging and/or joggling. A proportion of the settling dust agglomerated in the filter which corresponds to the amount of dust in the incoming smoke laden gas and which cannot be carried back to the filter surfaces by the smoke-laden gas is removed from said dust collecting trough.A lower part of the dust collecting trough is occupied by a longitudinally extending, rotatably mounted, perforated or sieve-like drum which is arranged to be filled with heavy bodies such as balls. The upper part of the drum is exposed and acts as a dust-collecting store or reservoir to which the smoke-laden gas is fed in order to flow transversely through the drum and its contents.

Abstract: The air filter and vacuum cleaning system includes an air filter unit having partitions and filtering material arranged to define a plurality of air channels between the air entrance and exit ends of the filter. The filter material itself is in the form of a cloth strip of fibrous material such as glass fibers and is wound back and forth about the ends of the partitions adjacent the entrance and exit openings of the filter to provide folds. A vacuum cleaning head is mounted for movement across the entrance end of the filter, the head having a vacuum slot cooperating with the air channels and folds of the filter material to result in high velocity air which will pick up and move slugs of accumulated impurities on the inner folds of the filter material adjacent the air exit end.

Abstract: A cleaning system for sleeve-type air filters featuring top removal of sleeves of the filtering media and increased filtering capacity, using sharply pulsed backflushing air of short duration from a single source for cleaning the sleeves which requires substantially less power and simpler mechanical structure than conventional filters of similar capacity. Filter sleeves depend from clean air outlet ports which are arrayed in concentric rings in a porting plate in closely-spaced relation one from the next at uniform circular and radial pitches allowing more sleeves to be packed in the porting plate which separates the clean air section from the dusty air section of said filter and more capacity from the same size filter than was heretofore possible. A tank is repetitively charged with air to a set pressure by a pump and the pressurized air is released by a pulse generating valve for distribution of the air to said sleeves for backflushing at essentially random frequency.

Abstract: An apparatus for the separation of particles from a gas of the type which has filter elements disposed around a drum located in the center of a housing with a shutter mechanism. The improvement of the present invention also relates to an apparatus which allows separation and emptying of filter elements by the shutter mechanism and particle separation without venting of particles to the atmosphere. The apparatus is particularly useful for instance, for asphalt mixing plants, stone quarry or foundry dust separation and collection.

Abstract: A bag type air cleaning apparatus is described for collecting particulate sediment from a source of pressurized air. The apparatus is adapted for connection to the pressurized air source and receives the pressurized air within a cylindrical plenum. A plurality of upright pervious bags are openly associated with the plenum for receiving the pressurized air. The air and particulate sediment is forced upwardly into the bags and against the bag interior surfaces where the sediment will collect as the air escapes through the pervious material. The bags are mounted on upright frames that are collapsible for storage purposes. A sliding duct is provided in communication with a blower mechanism in order to successively clean the inside surfaces of the bags. The sliding duct includes a manifold that comes into contact with successive openings of the bags while being pivoted about within the plenum.

Abstract: A cleaning purge head for a baghouse traveling centrally of the clean air plenum to isolate and back flush with high pressure air successive compartments of filter bags arranged in two parallel banks of filters. Through a depressible seal, the purge head communicates with a pressure chamber supplying cleaning air. A cam activated valve regulates the bursts of cleaning air supplied to successive filter bag compartments as a delivery conduit registers therewith such that the purge head alternates in cleaning the two banks of filters on successive passes through the baghouse.

Abstract: A device and method for collecting selected components of a fluid mixture such as ambient air are disclosed. A chamber formed by wall members and having an open end contains a layer of collecting material on the bottom thereof and a porous layer covering the open end. After this device has been exposed to the fluid mixture for the prescribed time, a solid cap is placed over the open end of the chamber which facilitates introduction and removal of a elutant for subsequent analysis.

Abstract: A filtering device is disclosed for removing particulate solids from a continuously flowing gas stream and which comprises a filter chamber that contains filter bags from which filtered gas is discharged into a plurality of plenum chambers arranged in a radial pattern around the axial center line of the filter. A pressure blower for a cleaning gas is located centrally with respect to the plenum chambers, and the casing of the blower is intermittently revolvable and has an outlet which sequentially falls into alignment with outlets in the plenum chambers through which filtered gas normally flows outward, but through which the cleaning gas is injected inwardly when aligned with the outlet of the blower casing, thereby providing means for intermittently reversing the gas flow in the filter bags and momentarily generating a pressure therein which is greater than exists in the filter chamber.

Abstract: Apparatus for purifying an air or gas flow of combustible vaporous or gaseous impurities by passing the air or gas through an adsorption filter and charging the filter to a predetermined level. After the filter is so charged, the air or gas flow is interrupted and the filter is desorbed by passing a heated inert gas generated by stoichiometric burning of hydrocarbons through the filter.