SCREW FILTER PRESS

摘要

Described is a screw filter press comprising a screw shaft, which has at least one coil turn and two screw shaft ends, the shaft axis of which is oriented parallel to the gravity vector and which is supported on one side via the upper screw shaft end thereof and which is connected to a rotary drive, and which is enclosed coaxially, at least in its lower partial area in a so-called filter area by a cylindrical filter tube, which is provided with openings and at which a filtrate space adjoins radially, to which underpressure can be applied. The invention is characterized in that a sliding tube, which radially surrounds the screw shaft in the direction of the upper screw shaft end in a fluid-tight manner, follows coaxially to the filter tube at the same inner diameter as the filter tube, that provision is made between the at least one coil turn of the screw shaft and the sliding tube for a radial play and that the at last one coil turn of the screw shaft adjoins the filter tube in the area of the filter tube either indirectly or directly at the inner wall.

主权项

1. A screw filter press comprising:
a screw shaft including at least one coil turn and two screw shaft ends for driving a filtrate containing a suspension of solids upward upon rotation, a shaft axis of the screw shaft oriented parallel to a gravity vector and which is supported on one side via an upper screw shaft end which is connected to a rotary drive and which is enclosed coaxially, at least in a lower partial filter area, by a cylindrical filter tube, with openings and at which a filtrate space radially adjoins, to which underpressure is applied by an external source of underpressure below atmospheric pressure; and a sliding tube, radially surrounding the screw shaft in a fluid-tight manner coaxial to the filter tube with an inner diameter equal to an inner diameter of the filter tube; and wherein the sliding tube includes a discharge opening for solid filtrate at the upper screw shaft end, the equal inner diameter of the sliding tube and the filter tube causing the filtrate to flow during operation of the press, discharge of the solid filtrate with a controllable consistency, and the at least one coil turn of the screw shaft ending radially relative to the screw shaft in a flange which revolves helically around the screw shaft and which adjoins the filter tube at an inner wall thereof; the underpressure below atmospheric pressure from the external source is applied to liquid filtrate in the filtrate space for drawing liquid from the liquid filtrate in the filtrate space in a start-up phase and after the start-up phase drawing liquid from the filtrate in a sliding area of the sliding tube.