Gas borne particle filtering apparatus
AssigneeJames M. Hammond
InventorJames Long
Life of this patent
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Abstract
A gas borne particle filtering apparatus having a filter medium (13) with inlet and outlet openings (11, 12) in a staggered sawtooth cross-sectional configuration (140, 141) in a casing (10) for the filter medium positioned such that the gas passes along and between the sawteeth on both sides of the filter medium is described. A screened belt or support (14) for the filter medium is described. The apparatus is particularly suited to cleaning heated or cooled air in a confined work space in a factory containing small micron sized particles so that the air can be recycled.
Claims14
In a gas borne particle filtering apparatus including a non-metallic filter medium (13) having first and second surfaces (13a and 13b) and a depth (d) between the surfaces, an outer casing (10) having an inlet and an outlet opening (11, 12), an endless moveable feed belt (14) in the casing defining rounded tip (15) multiple sawtoothed cross-sectioned projections alternately pointed in two opposite first and second directions (16 and 16a) which feed belt is located between the inlet and outlet openings, rollers (18) mounted on the casing at the tips of the projections and moveably supporting the filter medium and belt with the first surface of the filter medium adjacent the inlet opening and the second surface of the filter medium in contact with the belt, wherein the inlet and the outlet openings are separated by the filter medium in the casing for filtration and including means for moving the feed belt to remove the filter medium and means for collecting the removed filter medium, the improvement which comprises:
- (a) closing the projections pointing in the first direction (16a) with a first side of the casing (10) such that the projections pointing in the second direction (16) define inlet openings;
- and
- (b) closing the projections pointing in the second direction (16) with a second side of the casing (10) opposite to the first side such that the projections pointing in the first direction (16a) define outlet openings;
- and
- (c) a small mesh, non-metallic screen as the feed belt (14);
- wherein in use gas flow with the particles is along the first surface (13a) of the filter medium towards the sawtoothed projections which are closed in the second direction (16) on the second side of the casing, then at an angle from the gas flow along the first surface through the filter medium, then through the feed belt and then along the second surface (13b) of the filter medium and the belt away from the projections closed in the first direction (16a) on the first side of the casing and then out the outlet opening.
In a gas borne particle filtering apparatus including a filter medium (13) having first and second surfaces (13a and 13b) and a depth (d) between the surfaces, an outer casing (10) having an inlet and an outlet opening (11,12), an endless moveable feed belt (14) in the casing defining rounded tip (15) multiple sawtoothed cross-sectioned projections alternately pointed in two opposite first and second directions (16 and 16a) which is located between the inlet and outlet openings, rollers (18) mounted on the casing at the tips of the projections and moveably supporting the filter medium and belt with the first surface of the filter medium adjacent the inlet opening and the second surface of the filter medium in contact with the belt, wherein the inlet and the outlet openings are separated by the filter medium in the casing for filtration and including means for moving the feed belt to remove the filter medium and means for collecting the removed filter medium, the improvement which comprises:
- (a) closing the projections pointing in the first direction (16a) with a first side of the casing (10) such that the projections pointing in the second direction (16) define inlet openings;
- (b) closing the projections pointing in the second direction (16) with a second side of the casing (10) opposite to the first side such that the projections pointing in the first direction (16a) define outlet openings;
- wherein in use gas flow with the particles is along the first surface (13a) of the filter medium towards the sawtoothed projections closed in the second direction (16) on the second side of the casing, then at an angle from the gas flow along the first surface through the filter medium, then through the feed belt and then along the second surface (13b) of the filter medium and the belt away from the projections closed in the first direction (16a) on the first side of the casing and then out the outlet opening.
Dependencies are inferred from the claim text.