| 摘要 |
The present invention provides a device (10) to be incorporated into a centrifugal pump (20) for processing and pumping a slurry containing solid and semi-solid scale and aggregate. The device (10) is located at the pump suction line (21) upstream of the impeller (22) and is adapted to minimise choking and/or clogging of the impeller. The device (10) includes a grading means (11) preferably comprising a plate member (13) having a plurality of apertures (14), the plate member forming a partition across the suction line (21) to prevent scale and aggregate of greater than a predetermined size from passing to the impeller. The device (10) further includes attrition means (12) which reduces the oversized material which has been prevented from passing to the impeller (22) to a size less than or equal to the predetermined size. The attrition means (12) preferably includes a rotatable member (15) which is adapted to grind or abrade any oversized scale and aggragate to a pumpable size. The rotatable member (15) may be arranged adjacent an upstream side of the plate member (13) to grind or abrade the scale and aggregate thereagainst. |
