| 摘要 |
A screw pump comprising a driving screw (12) and a toothed, rotatable sealing disc (15) meshing therewith, the teeth (20) of the disc meshing with recesses formed between the threads (22) of the screw and seal against these, the teeth (20) of the sealing disc (15) having substantially parallel side edges (22) and triangular gaps (19) between the teeth. The purpose of the present invention is to provide a screw pump, which has a high pump effect, which exerts the sealing disc (15) to a substantially less wearing, which effectively can keep the pump screw clean from adhering substances, which can be manufactured by casting and thus obtains a low weight simultaneously as it is simple from a constructional point of view and thus can be easily disassembled for cleaning, service and repair. These tasks have been solved by the features that the flanges, which form the thread (21) of the screw have a substantially constant or, in the direction towards the top of the flange, tapering thickness with the exception of the threaded part of the screw (12) situated in front of the central part of the sealing disc (15), which threaded part is partially formed as a bead or a ridge, and that the bead or the ridge (18) has a measure in the rotational direction of the screw which substantially corresponds to the shifting distance of the screw (12) in moving the sealing disc (15) from a position at which one tooth seals to a position at which a second, next following tooth seals. |
