| 摘要 |
602549 A centrifugal pump that comprises a casing in which an impeller (1) is arranged. The impeller has a back side (2) that faces a back plate of the centrifugal pump, and one or more vanes (51-55) for pumping the fluid. The back side of the impeller comprises a segmented scraper (3) for scraping from the back plate material that has been deposited from the fluid. The segmented scraper comprises multiple protrusions (101-118), wherein each protrusion of the multiple protrusions is facing the back plate, at least two (104, 105) of the multiple protrusions are arranged at various radial distances from a centre of the impeller, and an aggregated radial extension of the protrusions equals a radius of the impeller within an interval of ± 10%, ± 25% or even up to ± 40%. |
