US 12,258,961 B2
Fault rectification method for a progressive cavity pump of a conveyor device for conveying viscous building materials
Thorsten Schnittger, Frickingen (DE); Lam Huu Nguyen, Woodbury, MN (US); Florian Spindler, Ravensburg (DE); and Alfred Göhring, Salem (DE)
Assigned to J. WAGNER GmbH, Markdorf (DE)
Appl. No. 18/043,833
Filed by J. WAGNER GmbH, Markdorf (DE)
PCT Filed Aug. 27, 2021, PCT No. PCT/EP2021/073718
§ 371(c)(1), (2) Date Mar. 2, 2023,
PCT Pub. No. WO2022/048997, PCT Pub. Date Mar. 10, 2022.
Claims priority of application No. 10 2020 123 119.9 (DE), filed on Sep. 4, 2020.
Prior Publication US 2023/0349378 A1, Nov. 2, 2023
Int. Cl. F04C 14/28 (2006.01); F04C 2/107 (2006.01); F04C 14/06 (2006.01)
CPC F04C 14/28 (2013.01) [F04C 2/1071 (2013.01); F04C 14/06 (2013.01); F04C 2240/40 (2013.01); F04C 2240/81 (2013.01); F04C 2270/052 (2013.01); F04C 2270/07 (2013.01); F04C 2270/18 (2013.01); F04C 2270/195 (2013.01); F04C 2270/86 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A conveying apparatus for conveying viscous construction materials, the conveying apparatus comprising:
an eccentric screw pump comprising a rotor/stator unit;
a drive unit comprising an electric motor; and
a control device that is programmatically configured to:
monitor a start of a conveying operation of the eccentric screw pump by way of a characteristic-variable-monitoring program of the control device that acquires characteristic-variable values for one or more characteristic variables; and
execute a working-free program if the characteristic-variable values are stored, alone or in combination with one another, as fault values that indicate jamming of the rotor/stator unit of the eccentric screw pump, and wherein the control device is configured to otherwise begin the conveying operation;
operate the eccentric screw pump in the working-free program in such a way that the electric motor is multiply alternately switched on and switched off, wherein, prior to each restart of the working-free program, the control device is configured to allow a pause time to elapse and/or allow a limit temperature to be reached by cooling, and the working-free program is run through only a fixed number of times and then the control device carries out a complete shutdown of the conveying apparatus.