An aerator is an impeller in the biological part of a sewage treatment plant. It swirls the surface of the water so that it is enriched with oxygen. This activates the bacteria, so that the biodegradable constituents are removed from the sludge.
The impeller is fixed to the gear unit output shaft, which is extended vertically downward, a certain distance from the gear unit. To prevent the clarified water from becoming contaminated with gear oil, FLENDER gear units are designed with an output shaft featuring an oil retaining tube and a non-contacting, non-wearing shaft seal.
The axial and lateral loads resulting from the process are absorbed by extra-heavy-duty output shafts and output bearings.
Helical and bevel helical gear units
2- and 3-stage
up to 3,600 kW
i = 6.3 to 112
10.5 to 173 kNm
Oil pressure lubrication with flanged-on pump
Dry well design (shaft seal is absolutely oil-tight)
Coupling flange for mounting the aerator
High operational reliability
Low noise level