Flender gear units for water and wastewater
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 for water and wastewater 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.
Flender gear units for aerators
Your benefits at a glance
Oil pressure lubrication with flanged-on pump
Reinforced bearings
Dry well design (shaft seal is absolutely oil-tight)
Coupling flange for mounting the aerator
High operational reliability
Low noise level
High efficiencies
Applications
Wastewater treatment
Water screws
Water screws rotate in semicircular concrete channels and are used to raise water in water-treatment plants and drainage systems. The screw works on the Archimedian principle at an inclination angle of approx. 38°.
Water screws can transport very dirty liquids, even when they contain finer solid materials. Usually the conveying height is just a few metres at a relatively fast output-flow rate.
The gear-unit output shaft set at an angle in the helix angle of the screw does not absorb any additional forces and transmits the torque to the screw shaft by means of a flexible coupling. Flender gear units for water and wastewater are configured for such special application. Their use requires of the gear unit an adapted oil level, a suitable shaft sealing, an oil drain and a ventilation device. To prevent the screw from running backwards under the pressure of the water forced back when the motor is stopped, the gear unit can be fitted with a backstop.
Flender gear units for water screw pumps
Your benefits at a glance
Low noise emission
Low vibration
High efficiency
Complete solution
– Mounted on a basic frame
– Backstop (optional)
– Coupling protection by safety hood
Monitoring possible
Splash lubrication
Applications
Municipal wastewater plants
Dewatering
Irrigation systems
Wherever water must be lifted from one level to a higher level
