| 摘要 |
The invention concerns a centrifugal pump for pumping polluted liquids. The pump comprises an impeller (6) of a so-called closed type having two cover discs (11) and (12) respectively and vanes (13) therebetween. The inner parts of the vanes (13) cooperate with cutting means (5) within the pump inlet, while the lower cover disc (12) together with a non-rotating insert part (4) in the pump inlet create a radial seal, which prevents medium from entering beside of the impeller (6). |
