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US 4,251,237 AGranted
Air filter and method of filtering
OwnerRandall E. Smithinventor
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OwnerRandall E. Smithinventor
Estimating the term…
An improved method and apparatus for removing solid contaminants from the air comprising a generally stationary horizontally disposed cylindrical housing having a pair of spaced opposed vertical end walls and a peripherally disposed filter medium wall extending therebetween to define a filter compartment, a reduced air inlet opening in one end wall for introducing air to be filtered into the compartment and initially directing the same in a path of travel to the other end wall for deflection and recirculation through the compartment in a generally circular path before passage through the cylindrical filter medium wall for filtration thereby, and a plurality of contaminant discharge openings spaced about the lower peripheral portion of the other end wall for directly removing contaminants in the air from the compartment before their entrapment on the filter medium of the unit.
An improved self-cleaning filter unit for removing contaminants from air directed therethrough comprising a housing having a pair of spaced walls and a peripherally disposed filter medium extending therebetween to define a filter compartment, an air inlet opening in a portion of one wall of sufficient size for introducing air to be filtered into the compartment and initially directing the same in a path of travel to the other wall before its passage outwardly through said filter medium, movable nozzle means in the filter compartment for traversing the filter medium to remove contaminants collected thereon, conduit means connected to the nozzle means for conveying the removed contaminants from the filter compartment, and one or more discharge openings in a portion of said other wall which lies in the path of the travel of the air directed from said inlet opening to permit direct removal of a portion of the contaminants in the air stream from the compartment before its passage through said filter medium.
An improved self cleaning filter unit for removing solid contaminants from air directed therethrough comprising a stationary, generally cylindrical housing having a pair of spaced vertical end walls and a cylindrical filter medium wall extending therebetween to define a filter compartment, an air inlet opening in the lower portion of one of said end walls and of sufficient size for introducing air to be filtered into the compartment and initially directing the same in a generally horizontal path of travel across the lower portion of the compartment to the other end wall for deflection thereby, a plurality of contaminant discharge openings located in spaced relation about the lower peripheral portion of said other end wall and in the path of travel of air thereto from said inlet opening for direct removal of contaminants entrained in the air from said compartment before entrapment thereof on said filter medium wall, suction nozzle means mounted in said compartment for movement over the inner surface of said filter medium wall to remove contaminants collected thereon, and conduit means connected to said nozzle means for conveying the removed contaminants from the filter compartment.
An improved method of filtering airborne contaminants from air directed through a filtration unit having a pair of spaced walls and a peripherally disposed filter medium extending therebetween to define a filtration compartment, comprising the steps of directing the air into the compartment through an air inlet opening in one wall thereof and in an initial stream across the compartment to the other end wall for deflection thereby in a generally circular path about the compartment before passage through said filter medium, removing an initial portion of the contaminants carried in the air stream from the compartment through one or more discharge openings in said other end wall before its passage through the peripherally disposed filter medium, and removing contaminants collected on the filter medium during passage of air therethrough from the filter compartment to clean the filter medium during filtration.
Dependencies are inferred from the claim text.