US 11,841,017 B2
Eccentric-screw pump with concentricity sensor
Julian Harking, Bottrop (DE)
Assigned to SEEPEX GMBH, Bottrop (DE)
Appl. No. 17/619,877
Filed by SEEPEX GMBH, Bottrop (DE)
PCT Filed Oct. 28, 2020, PCT No. PCT/EP2020/080251
§ 371(c)(1), (2) Date Dec. 16, 2021,
PCT Pub. No. WO2021/094087, PCT Pub. Date May 20, 2021.
Claims priority of application No. 102019130981.6 (DE), filed on Nov. 15, 2019.
Prior Publication US 2022/0356877 A1, Nov. 10, 2022
Int. Cl. F03C 2/00 (2006.01); F03C 4/00 (2006.01); F04C 2/00 (2006.01); F04C 18/00 (2006.01); F04C 2/107 (2006.01); F04C 14/28 (2006.01)
CPC F04C 2/107 (2013.01) [F04C 2/1071 (2013.01); F04C 14/28 (2013.01); F04C 2270/86 (2013.01)] 11 Claims
OG exemplary drawing
 
1. An eccentric screw pump comprising:
a stator,
a rotor rotating in the stator,
a drive,
a pump housing connected to the stator and having at least one inlet or outlet opening for a medium to be conveyed,
a connecting shaft driven by the drive and rotating concentrically with an axis on ideal operation of the pump,
a connecting housing connected between the pump housing and the drive and at least partially surrounding the connecting shaft,
a coupling-side shaft seal between the connecting shaft and the connecting housing,
a coupling rod in the pump housing and connected to the connecting shaft at a drive-side end and to the rotor at a rotor-side end thereof and generating eccentric movement of the rotor-side end on concentric rotation of the connecting shaft, and
means including a sensor mounted in or on the connecting housing adjacent the connecting shaft for detecting or measuring deviation from axially concentric rotation thereof for determining a movement profile at a predetermined angular position of the connecting shaft by measuring a distance between an outer surface of the connecting shaft and the sensor.
 
7. A method of operating an eccentric screw pump comprising:
a stator,
a rotor rotating in the stator,
a drive,
a pump housing connected to the stator and having at least one inlet or outlet opening for a medium to be conveyed,
a connecting shaft driven by the drive and rotating concentrically with an axis on ideal operation of the pump,
a connecting housing connected between the pump housing and the drive and at least partially surrounding the connecting shaft,
a coupling-side shaft seal between the connecting shaft and the connecting housing,
a coupling rod in the pump housing and connected to the connecting shaft at a drive-side end and to the rotor at a rotor-side end thereof and generating eccentric movement of the rotor-side end on concentric rotation of the connecting shaft, and
means including a sensor mounted in or on the connecting housing adjacent the connecting shaft for detecting or measuring deviation from axially concentric rotation thereof for determining a movement profile at a predetermined angular position of the connecting shaft by measuring a distance between an outer surface of the connecting shaft and the sensor,
the method comprising the step of the sensor determining the movement profile of the connecting shaft in at least one predetermined angular position of the connecting shaft by measuring a distance of the outer surface of the connecting shaft from the sensor.