Stationary drum filtration device and method

Claim 1

A filtration device for removing particulate matter entrained in a gas stream comprising: a housing defining a generally cylindrical filtration chamber therein of a first prescribed diameter having a central axis and a main gas inlet to said filtration chamber through which the gas stream enters said housing chamber; a support drum mounted in said filtration chamber and including an annular perforated side wall concentric about said central axis with a second prescribed diameter smaller than said first prescribed diameter to define an annular inlet subchamber in said filtration chamber between said drum and said housing; a suction head rotatably mounted on said housing within said support drum for rotation about said central axis, said suction head including a suction head gas inlet adjacent the inside of said support drum and movable around said drum as said suction head is rotated and including a suction head gas outlet about said central axis extending out of said housing, said suction head further including sealing means about said suction head gas inlet for forming a substantially gas tight seal between said suction head gas inlet and said perforated drum side wall as said suction head is rotated so that the gas stream entering said housing can only pass out of said housing through that portion of said perforated drum side wall in registration with said suction head gas inlet, said suction head gas inlet, and said suction head gas outlet; filter media removably positioned on said perforated side wall of said support drum within said inlet subchamber so that the gas stream passing from said inlet subchamber into said suction head must pass through that portion of said filter media in registration with said suction head gas inlet; and, fan means operatively connected to said suction head gas outlet to cause the gas stream entering said main gas inlet to be drawn into said inlet subchamber, then through that portion of said filter media and said perforated side wall of said support drum aligned with said gas inlet to said suction head, then into said suction head gas inlet and finally out said suction head gas outlet whereby the particulate matter is separated from the gas stream by that portion of said filter media in registration with said suction head gas inlet.

Claim 12

A method of removing particulate matter entrained in a gas stream comprising the steps of: a. positioning a filter media with a prescribed surface area so that one side thereof is in communication with the gas stream with the particulate matter entrained therein; b. positioning a suction head defining a suction inlet therein with a second prescribed cross-sectional area smaller than said first prescribed surface area of said filter media on that side of said filter media opposite the side in communication with the gas stream so that the gas stream is drawn into the suction inlet of said suction head through said filter media to separate the particulate matter from the gas stream; and c. moving said suction head along the length of said filter media so that substantially all of the filter media is eventually used.

Claim 13

A method of removing particulate matter entrained in a gas stream comprising the steps of: a. positioning a filter media with a prescribed surface area so that one side thereof is in communication with the gas stream with the particulate matter entrained therein; b. positioning a suction head defining a suction inlet therein with a second prescribed cross-sectional area smaller than said first prescribed surface area of said filter media on that side of said filter media opposite the side in communication with the gas stream so that the gas stream is drawn into the suction inlet of said suction head through said filter media to separate the particulate matter from the gas stream; and c. moving said suction head along the length of said filter media so that substantially all of the filter media is eventually used.