An air filter for removing particulate matter from an airstream comprising a casing with a first air guide means for efficiently directing the uncleansed particulate-laden air into an inertial separating means enclosed within said casing, said inertial separating means adapted to remove relatively heavy particles from the airstream; a second air guide means for efficiently directing the airstream from said inertial separation means to the outer surface of the filter media of a filter enclosed within said casing and surrounding said inertial separating means, said filter media removing substantially all of the remaining particulate matter from said airstream; and a third air guide means for efficiently directing the now cleansed airstream out of said air filter.
This application is a continuation of application Ser. No. 335,997, filed Feb. 26, 1973, now abandoned which was a division of application Ser. No. 126,046, filed Mar. 19, 1971 now abandoned.
When work processing equipment and more particularly floor sanding machines have means for drawing off dust, they are also fitted with a device for aspiration of the dust laden air and the collection of the dust. The device in accordance with the invention comprises a filter device, arranged in the flow path of the air, manufactured of an air permeable material retaining the dust so that dust-free air is released into the surroundings. In the flow path upstream from the filter device there is a dust separator, which at the lower side thereof has a dust outlet opening and above the dust outlet opening has an air outlet opening facing the filter device. Underneath the dust outlet opening it is possible for a dust collecting container to be connected with the result that the separated dust drops under the effect of gravity into the container. It is convenient if the filter device delimits a filter chamber with a dust outlet opening on the lower side. The dust collecting container is arranged underneath the dust outlet opening. The connecting passage from the dust outlet opening to the container is provided with a valve device which may be moved between a closed operational position and an open cleaning position.
Apparatus and method for separating particulate from gas produced by combustion of fossil fuel including a main vessel having a lower compartment in which the fuel is burned and an upper compartment in which the separation of particulate takes place. The separation is effected by combining roughing cyclones for separating the larger particulate with modules of cross-flow filters for separating the residual smaller particulate which emerges from the cyclones. The upper compartment includes a plurality of pressure vessels each containing a cyclone and modules of cross-flow filters mounted vertically. In each module the cross-flow filters are divided into an upper cluster, middle cluster and a bottom cluster. In each of the upper and middle clusters the cross-flow filters are arrayed or stacked vertically in columns in T configuration. In the bottom cluster the filters are arrayed in cruciform configuration. Each cluster has a separate pipe for conducting gas processed by the cross-flow filters out and pulses for cleaning the cross-flow filters in. The cleaning gas is conducted in succession through the separate pipes. The middle cluster is rotated about 120.degree. about its vertical axis with respect to the upper cluster to afford clearance for the respective pipes from these clusters. The vertical axes of the pipes from the three clusters are spaced by 120.degree. from each other.
Apparatus for, and the method of, cleaning air, for engines and related uses, including an air cleaner with a body having a vertical axis and including a cylindrical wall, a solid top closure, and a bottom closure including an axial, reentrant, cleaned air outlet conduit defining with the wall a lower annular space, the wall being provided with a lateral scavenge outlet to the annular space below the upper end of the outlet conduit, with a plurality of inwardly formed spirally oriented peripheral ambient air inlet louvers spaced therearound above the upper end of the outlet conduit, and with a bleeder arrangement including a plurality of secondary ambient air inlet ports spaced around the wall above the louvers and adjacent the lid, the arrangement being designed for connection of the outlet conduit to the inlet of an engine, to enable air flow to the engine inwardly through the louvers and the bleeder means, and for connection of the scavenge outlet to aspirating apparatus such as an aspirator actuated by the exhaust of the engine, for causing a scavenging flow of air from the annular space.
A cyclone separator having multiple-vaned gas inlets adapted to guide the gas flow into the interior of the cyclone separator. The total sum of the inlet areas is at least equal to the smallest internal flow area and the cyclone is useful for separating suspended solid particles from internal combustion engine exhaust gases.
A cyclone type personal aerosol sampler has a two-stage operation with a standard cyclone sampler providing a cutoff of particles in the range of 10 microns to a secondary cyclone sampler. The secondary cyclone sampler has the ability to inertially separate out particles below about 0.8 microns from larger particles. The secondary sampler has a readily removable cup for collecting the larger particles, and an easily replaceable filter for collecting the smaller particles for analysis.
