US 11,885,332 B2
Operating method for a conveying device with an eccentric screw pump for conveying viscous construction materials
Thorsten Schnittger, Frickingen (DE); and Lam Huu Nguyen, Woodbury, MN (US)
Assigned to J. Wagner GmbH, Markdorf (DE)
Appl. No. 18/043,825
Filed by J. WAGNER GmbH, Markdorf (DE)
PCT Filed Aug. 27, 2021, PCT No. PCT/EP2021/073721
§ 371(c)(1), (2) Date Mar. 2, 2023,
PCT Pub. No. WO2022/048998, PCT Pub. Date Mar. 10, 2022.
Claims priority of application No. 10 2020 123 120.2 (DE), filed on Sep. 4, 2020.
Prior Publication US 2023/0235738 A1, Jul. 27, 2023
Int. Cl. F04C 28/06 (2006.01); F04C 2/16 (2006.01); F04C 28/28 (2006.01)
CPC F04C 28/06 (2013.01) [F04C 2/16 (2013.01); F04C 28/28 (2013.01); F04C 2270/19 (2013.01); F04C 2270/215 (2013.01)] 18 Claims
OG exemplary drawing
 
1. An operating method (BV) for a conveying device with an eccentric screw pump for conveying viscous construction materials (BM) comprising the following steps:
sensing a pressure of the construction materials (BM) at an outlet of the eccentric screw pump when the eccentric screw pump is running and automatically switching off the eccentric screw pump if the pressure exceeds an upper limit value, otherwise continued operation of the eccentric screw pump;
sensing a characteristic variable of the running eccentric screw pump and comparison of the characteristic variable with a first comparison variable, which is characteristic of operation with an open dispensing device, and/or with a second comparison variable, which is characteristic of operation with a closed dispensing device, and switching off the eccentric screw pump if operation with a closed dispensing device is detected, otherwise continued operation of the eccentric screw pump;
if continued operation is undertaken, renewed performance of the aforementioned steps takes place;
if switching off of the eccentric screw pump is undertaken, a pressure prevailing at the outlet of the eccentric screw pump is monitored in such a way that the operation of the eccentric screw pump is started once again and the aforementioned steps are performed once again if
either the pressure prevailing at the outlet of the eccentric screw pump falls by a first pressure difference within a first time interval due to opening of a dispensing device or an open dispensing device
or, for system-related reasons, the pressure prevailing at the outlet of the eccentric screw pump falls more slowly to a lower limit value or by a second pressure difference with a closed dispensing device, the second pressure difference being greater than the first pressure difference.