US 12,458,977 B2
Cutting ring for solids-loaded fluid of a pump
Johannes Reuschel, Dortmund (DE); Benjamin Wegner, Dortmund (DE); Andreas Zeiss, Dortmund (DE); and Thomas Keil, Dortmund (DE)
Assigned to WILO SE, Dortmund (DE)
Filed by WILO SE, Dortmund (DE)
Filed on Jan. 25, 2024, as Appl. No. 18/422,900.
Application 18/422,900 is a division of application No. 17/960,034, filed on Oct. 4, 2022, granted, now 12,083,527.
Prior Publication US 2024/0157370 A1, May 16, 2024
Int. Cl. B02C 18/18 (2006.01); B02C 23/36 (2006.01); F04D 7/04 (2006.01); F04D 29/22 (2006.01); F04D 29/70 (2006.01)
CPC B02C 18/18 (2013.01) [B02C 23/36 (2013.01); F04D 29/708 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A pump for liquid loaded with solids comprising an impeller and a cutting head for interaction with a cutting ring, wherein
the cutting head has a cutting head base body which is assigned to the impeller of the pump, wherein a plurality of protrusions are provided on a circumferential surface of the cutting head base body, the plurality of protrusions each have axially extending cutting head cutting edges for comminuting the solids, the plurality of protrusions each extend radially away from the cutting head base body and the plurality of protrusions each extend from a fluid inlet side of the cutting head arranged opposite the impeller axially in a direction of the impeller,
the cutting head cutting edges of one of the plurality of protrusions extends from the fluid inlet side over an entire axial extension of the cutting head and the cutting head cutting edges of a second one of the plurality of protrusions extends from the fluid inlet side only over a part of the entire axial extension of the cutting head, and
the second one of the plurality of protrusions tapers in another part of the axial extension towards a side of the cutting head facing the impeller.