Patent ID: 7080798
Filing Date: 2006-07-25
Classification: A22C,F04C

Abstract:
1. Screw conveyor for the transport of flowable substances and/or lumps of material, comprising: a rotatable first screw provided with helical windings arranged in a housing with an inlet opening and an outlet opening, said housing including an inlet chamber and a pumping chamber between said inlet and outlet openings; at least in the pumping chamber, a second screw provided with helical windings and arranged for rotation in an opposite direction of the first screw, said first and second screws in said pumping chamber providing a positive displacement pumping function by mutual engagement between the first and second screws when said rotatable first screw is rotated in a first sense of rotation; a cutting device downstream of the pumping chamber and housed within a knife house, said cutting device including an internal channel, where said knife house is connected to said outlet opening; wherein said knife house is provided with second outlet means for receiving at least a portion of said substances and/or materials provided to the knife house from said pumping chamber; and wherein said second outlet means comprises a passage leading from said knife house to a controllable buffer valve which upon activation is able to accommodate said portion of substance and/or material and upon a subsequent activation is able to supply said substance and/or material back to the knife house.