US 11,982,295 B2
Pumping device for pumping liquids, comprising a centrifugal pump with a radially pumping pump wheel with a hollow center
Alexander Heide, Eppstein (DE)
Assigned to FRESENIUS MEDICAL CARE DEUTSCHLAND GMBH, Bad Homburg (DE)
Appl. No. 17/254,374
Filed by Fresenius Medical Care Deutschland GmbH, Bad Homburg (DE)
PCT Filed Aug. 29, 2019, PCT No. PCT/EP2019/073055
§ 371(c)(1), (2) Date Dec. 21, 2020,
PCT Pub. No. WO2020/043811, PCT Pub. Date Mar. 5, 2020.
Claims priority of application No. 10 2018 006 877 (DE), filed on Aug. 30, 2018.
Prior Publication US 2021/0268263 A1, Sep. 2, 2021
Int. Cl. F04D 9/00 (2006.01); A61M 60/232 (2021.01); A61M 60/538 (2021.01); F04D 13/06 (2006.01); F04D 15/00 (2006.01); F04D 29/048 (2006.01)
CPC F04D 9/004 (2013.01) [A61M 60/232 (2021.01); A61M 60/538 (2021.01); F04D 13/06 (2013.01); F04D 15/0027 (2013.01); F04D 15/0066 (2013.01); F04D 29/048 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A pumping device for pumping liquids, comprising
a. a centrifugal pump with a radially pumping pump wheel having a hollow center, wherein the pump is assigned a value of a first operating parameter at any point in time during operation,
b. a detecting device for detecting the first operating parameter,
c. a sensor for measuring a second operating parameter,
d. and a control unit for controlling the centrifugal pump, which is connected to the centrifugal pump, the detecting device for detecting the first operating parameter and to the sensor, is also equipped so that it controls operation of the pump and removes accumulations of gas from the hollow center of the pump during liquid operation of the pump, by
operating the pump in a first step for removal of gas so that at least the first operating parameter of the pump is varied over time (t) so that the first operating parameter assumes a series of different predetermined values one after the other,
and that meanwhile values of the second operating parameter associated with the values of the first operating parameter are recorded,
determining local and/or global extreme values (E) of the previously recorded values of the second operating parameter in a second step for removal of gas,
determining those values of the first operating parameter which are associated with the previously determined extreme values (E) of the second operating parameter in a third step for removal of gas,
operating the pump in a fourth step for removal of gas so that it assumes one of the values of the first operating parameter associated with the extreme values (E) of the second operating parameter for a predetermined period of time (T).