US 12,188,475 B2
Centrifugal pump and a pump housing
Alexander Schmid, Hausen am Albis (CH); and Marcel Stettler, Lenzburg (CH)
Assigned to LEVITRONIX GMBH, Zurich (CH)
Filed by Levitronix GmbH, Zurich (CH)
Filed on Aug. 24, 2020, as Appl. No. 17/000,458.
Claims priority of application No. 19198087 (EP), filed on Sep. 18, 2019.
Prior Publication US 2021/0079922 A1, Mar. 18, 2021
Int. Cl. F04D 17/16 (2006.01); F04D 1/00 (2006.01); F04D 13/02 (2006.01); F04D 13/06 (2006.01); F04D 25/02 (2006.01); F04D 29/048 (2006.01); F04D 29/18 (2006.01); F04D 29/22 (2006.01); F04D 29/42 (2006.01)
CPC F04D 17/161 (2013.01) [F04D 1/00 (2013.01); F04D 13/024 (2013.01); F04D 13/026 (2013.01); F04D 13/06 (2013.01); F04D 17/16 (2013.01); F04D 25/026 (2013.01); F04D 29/048 (2013.01); F04D 29/186 (2013.01); F04D 29/2266 (2013.01); F04D 29/4206 (2013.01); F05D 2240/30 (2013.01); F05D 2240/515 (2013.01); F05D 2300/43 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A centrifugal pump for conveying a fluid, comprising:
a pump housing;
a rotor configured to convey the fluid disposed within the housing; and
a stator which, together with the rotor, forms an electromagnetic rotary drive configured to rotate the rotor about an axial direction,
the stator being a bearing and drive stator with which the rotor is capable of being magnetically driven without contact and magnetically levitated without contact with respect to the stator,
the rotor being passively magnetically levitated in the axial direction, and actively magnetically levitated in a radial plane perpendicular to the axial direction,
the pump housing comprising a bottom and a cover, and the rotor being arranged in the pump housing between the bottom and the cover with respect to the axial direction, a plurality of indentations disposed in the bottom or in the cover and each of the plurality of indentations is located closer to in a radially outer edge region of the pump housing than to a center of the housing, the plurality of indentations being configured to generate a local turbulence and cause a geometrical influence on the flow conditions inside the pump housing to reduce the forces acting on the impeller.