US 12,152,591 B2
Barrel casing pump and method for manufacturing a barrel casing pump
Peter Amann, Birkenheide (DE); and Holger Lutz, Frankenthal (DE)
Assigned to KSB SE & Co. KGaA, Frankenthal (DE)
Appl. No. 17/440,385
Filed by KSB SE & Co. KGaA, Frankenthal (DE)
PCT Filed Mar. 4, 2020, PCT No. PCT/EP2020/055622
§ 371(c)(1), (2) Date Sep. 17, 2021,
PCT Pub. No. WO2020/187562, PCT Pub. Date Sep. 24, 2020.
Claims priority of application No. 10 2019 001 882.6 (DE), filed on Mar. 19, 2019.
Prior Publication US 2022/0163037 A1, May 26, 2022
Int. Cl. F04D 1/06 (2006.01); F04D 29/42 (2006.01); F04D 29/44 (2006.01)
CPC F04D 1/063 (2013.01) [F04D 29/426 (2013.01); F04D 29/445 (2013.01); F05D 2250/52 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A centrifugal pump, comprising:
a barrel casing;
a barrel casing cover configured to close an axial end of the barrel casing; and
at least one stage casing configured to be inserted in the barrel casing, wherein
in a transition region from a last stage casing of the at least one stage casing into a pressure nozzle of the barrel casing, a helical flow space is formed by a contour of the last stage casing, a contour of the barrel casing cover, and an inner contour of the barrel casing, and
the helical flow space, starting from a nose of the pressure nozzle, increases radially along a flow direction from the last stage casing to the pressure nozzle, while having a constant axial width from the last stage casing to the pressure nozzle.