Patent ID: 9371834
Filing Date: 2016-06-21
CPC Classification: F04D

Claim Text:
1. A centrifugal pump for pumping a fluid, the centrifugal pump comprising: a casing in which an impeller is arranged, the impeller having a back side facing a back plate of the centrifugal pump, wherein a gap is formed between the back side and the back plate, the impeller having one or more vanes for pumping the fluid; a connector extending from the impeller and through the back plate of the centrifugal pump, for connection of the impeller to a drive mechanism for rotating the impeller; the back side of the impeller comprising a segmented scraper for scraping from the back plate material that has deposited from the fluid, the segmented scraper comprising multiple protrusions on the back side of the impeller; at least some of the multiple protrusions being arranged at different radial distances from a centre of the impeller; each of the multiple protrusions faces the back plate; and an aggregated radial extension of all of the protrusions equals a radius of the impeller within an interval of up to ±25%, the aggregated radial extension of the protrusions being a sum of the extension of all of the protrusions in the radial direction.