Patent ID: 6478163
Filing Date: 2002-11-12
Classification: B04B

Abstract:
A decanter centrifuge comprising:a bowl; a screw conveyer provided in said bowl so as to rotate relatively to said bowl; said bowl comprising a cylindrical large diameter section into which slurry is supplied, a tapered section having the diameter decreasing from said large diameter section, and a small diameter section connected to the side of said tapered section having a smaller diameter; said small diameter section having fine filtrate discharging holes formed on a part or all over the circumferential wall thereof and cake discharging ports formed at an end opposite from said large diameter section; said small diameter section is provided with washing fluid supply means for supplying washing fluid to cake transported from said large diameter section through said tapered section; wherein said screw conveyor includes a plurality of flights for transporting said cake to said cake discharging ports in said small diameter section; said plurality of flights include a small clearance portion defining a small clearance and a large clearance portion defining a large clearance between the tip of said plurality of flights and the inner peripheral surface of said small diameter section respectively; the whole region of said large clearance portion of said plurality of flights overlaps with said small clearance portion of another flight located at the same axial position of said screw conveyer.