US 12,442,174 B2
Method for operating a wastewater-lifting system
Michael Becker, Frankenthal (DE); Juergen Geinitz, Frankenthal (DE); and Thomas Pensler, Frankenthal (DE)
Assigned to KSB SE & Co. KGaA, Frankenthal (DE)
Appl. No. 17/053,457
Filed by KSB SE & Co. KGaA, Frankenthal (DE)
PCT Filed May 7, 2019, PCT No. PCT/EP2019/061664
§ 371(c)(1), (2) Date Nov. 6, 2020,
PCT Pub. No. WO2019/215138, PCT Pub. Date Nov. 14, 2019.
Claims priority of application No. 10 2018 207 257.4 (DE), filed on May 9, 2018.
Prior Publication US 2021/0246646 A1, Aug. 12, 2021
Int. Cl. E03F 5/22 (2006.01); E03F 5/10 (2006.01); E03F 5/14 (2006.01); F04D 15/02 (2006.01)
CPC E03F 5/22 (2013.01) [E03F 5/14 (2013.01); E03F 5/10 (2013.01); F04D 15/029 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A method for operating a wastewater-lifting system in which wastewater laden with bulky materials, which are materials in the wastewater that are retained by at least one separating screen, is lifted and guided by a pump through a bulky material-collecting tank having the at least one separating screen arranged in the interior of the bulky material-collecting tank, comprising the steps of:
during intake of the wastewater, retaining the bulky materials in the bulky material-collecting tank and feeding pre-cleaned wastewater from which the bulky materials have been removed via a connecting line to a liquid-collecting tank via one or both of the pump and a bypass line connected to the connecting line between the bulky material-collecting tank and the pump,
wherein opposite ends of the connecting line and an end of the bypass line define a flap connector comprising a three-way bolted t-junction within which a pivoting flap is disposed,
during the intake of the wastewater, closing a portion of the connecting line between the bypass line and the pump except for a flushing cross section configured to allow flushing flow around the pivoting flap toward the pump, and opens the bypass line to permit the pre-cleaned wastewater to flow to the liquid-collecting tank, and
during a pumping process, closing the bypass line and opening the portion of the connecting line between the pump and the bypass line to permit the pump to pass the pre-cleaned wastewater from the liquid-collecting tank through the connecting line to the bulky material-collecting tank, wherein
the flushing cross section is at least in part formed by a bulged portion that is defined by an outward curvature in a wall of the connecting line adjacent to the pivoting flap, the outward curvature being located adjacent to a free end of the pivoting flap, and
the flushing cross section is established as an annular space or annular cross section, such that in a closed state of the pivoting flap, the pivoting flap is spaced apart from an inner wall of the flap connector.