US 12,313,070 B2
Eccentric screw pump having a stator linking which is simpler to produce
Dominik Sinseder, Dorfen (DE); Philipp Nübl, Gras Bahnhof (DE); Stefan Weigl, Mühldorf (DE); Stefan Voit, Amerang (DE); Stefan Schöberl, Buchbach (DE); and Thomas Schmitt, Lohkirchen (DE)
Assigned to NETZSCH Pumpen & Systeme GmbH, Selb (DE)
Appl. No. 18/712,858
Filed by NETZSCH Pumpen & Systeme GmbH, Selb (DE)
PCT Filed Nov. 18, 2022, PCT No. PCT/EP2022/082400
§ 371(c)(1), (2) Date May 23, 2024,
PCT Pub. No. WO2023/099240, PCT Pub. Date Jun. 8, 2023.
Claims priority of application No. 20 2021 106537.0 (DE), filed on Nov. 30, 2021; and application No. 10 2022 115814.4 (DE), filed on Jun. 24, 2022.
Prior Publication US 2024/0352931 A1, Oct. 24, 2024
Int. Cl. F04C 2/10 (2006.01); F04C 2/107 (2006.01); F04C 2/16 (2006.01)
CPC F04C 2/16 (2013.01) [F04C 2/1075 (2013.01); F04C 2230/20 (2013.01); F04C 2240/10 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An eccentric screw pump comprising:
a rotor forming a screw conveyor, and
a stator forming a screw flight, in which the rotor revolves during a conveying operation,
wherein the stator comprises a stator housing and a stator lining located within the stator housing, wherein the stator lining reproduces the screw flight,
wherein the stator lining is a sleeve having an outer periphery that is supported on the stator housing via a support structure, the support structure having a plurality of cavities and being connected to the sleeve, the support structure having support cells, each of which defines or encloses, respectively, one cavity of said plurality of cavities,
wherein as a function of the location of the connection to the sleeve, the support structure is designed and dimensioned to provide a support effect that is matched to local needs of the sleeve,
wherein a wall thickness of the support cells along a longitudinal axis of the stator lining increases in a flow direction from an entrance side of the support structure through to an exit side of the support structure, the increasing wall thickness providing the support effect that is matched to the local needs of the sleeve.
 
17. A stator lining for an eccentric screw pump having a rotor forming a screw conveyor and a stator forming a screw flight, the rotor being configured to revolve within the stator during conveying operation, the stator including a stator housing, the stator lining configured to be positioned within the stator housing and to reproduce the screw flight, wherein the stator lining comprises a sleeve which has an outer periphery that includes a support structure configured to support the sleeve on the stator housing, the support structure having a plurality of cavities and being connectable to the sleeve, the support structure having support cells, each of which defines or encloses, respectively, one cavity of said plurality of cavities, wherein as a function of the location of the connection to the sleeve, the support structure is designed and dimensioned to provide a support effect that it is matched to local needs of the sleeve,
wherein a wall thickness of the support cells along a longitudinal axis of the stator lining increases in a flow direction from an entrance side of the support structure through to an exit side of the support structure, the increasing wall thickness providing the support effect that is matched to the local needs of the sleeve.
 
18. A method for producing a stator lining, comprising shaping a sleeve by means of additive material application, preferably in an axial direction, from a bottom to a top, which reproduces a screw flight of an eccentric screw pump, wherein an outer peripheral surface of the sleeve merges into support cells integrally forming in cavities, which are shaped by means of additive material application,
wherein the support cells collectively provide a support structure, . wherein a wall thickness of the support cells along a longitudinal axis of the stator lining increases in a flow direction from an entrance side of the support structure through to an exit side of the support structure, the increasing wall thickness providing a support effect that is matched to local needs of the sleeve.