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LOW COST PORTABLE ROOM AIR CLEANER

  • US 3,812,370 A
  • Filed: 09/07/1971
  • Issued: 05/21/1974
  • Est. Priority Date: 09/07/1971
  • Status: Expired due to Term
First Claim
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1. In a compact, readily transportable, low cost, efficient room air filter for cleaning the room air of homes, offices and the like the improvement comprising a housing having at least a base, a backwall and two spaced-apart sidewalls, a high volume air fan supported within the housing, relatively high pressure plenum chamber means formed in part by the two spaced-apart sidewalls and with the high volume fan being disposed with its outlet discharging directly into said relatively high pressure plenum chamber means, means connected to the intake of the high volume fan to provide a suction inlet air passageway from exterior of the housing to the intake of the high volume fan, a coarse large particle prefilter disposed in the inlet air passageway, a relatively low cost, fine small particle filter, mounting means for mounting said fine small particle filter in the housing in a position transversely across and comprising at least part of one of tHe remaining walls of the high pressure plenum chamber means, and outlet means defined in part by said spaced-apart sidewalls for forming an air outlet passageway from said high pressure plenum chamber means through said fine small particle filter for directing the diffuse filtered discharge from the fine small particle filter to exterior of the housing, said relatively low cost fine small particle filter comprising a readily replaceable small particle filter assembly including an outer peripheral support member that defines the intake area of the fine small particle filter, said outer peripheral support member being mounted on said mounting means adjacent the high pressure plenum chamber means and comprising at least part of one side thereof, fine small particle filter media shaped in the form of a multiplicity of adjacent wedge-shaped pockets joined to each other and secured on the support member with the pockets extending out in the direction of airflow and away from the high pressure plenum chamber means, and coarse supporting means that impose little or no pressure drop secured to the wedge-shaped pockets and confining the configuration of a substantial portion of the respective pockets whereby adjacent pockets do not blow out to an extent sufficient to contact one another in a manner that otherwise would result in a restriction of airflow through any of the pockets, and a substantially even pressure gradient is maintained across all of the sides of all of the pockets to assure maximum utilization of the filtering surfaces of the fine small particle filter media and maintenance of steady large volume diffuse airflow caused by suction of the room air through the large particle prefilter into the fan and the discharge of the fan into the relatively high pressure plenum chamber means and through the fine small particle filter to result in diffuse circulation and removal of a substantial portion of all particles usually found in room air which are larger than 0.005 microns in size.

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