Archimedean Screw Pumps

Archimedean screw pumps (are designed for handling highly polluted liquids, sludge, etc., of temperature
up to 50 °C.

They are of a simple, sturdy design and of a high service reliability, long life, simple operation
and high efficiency.

They are capable of handling liquids with fairly large and even fibrous admixtures, without the necessity of a prior mechanical pre-purification. The Archimedean screw pumps are designed for an inclination of 30° up to 38° and belong to the family of lift pumps.

APPLICATION

Archimedean screw sludge pumps are intended primarily for the handling of sewage systems as well as for all cases where highly polluted liquids and sludge with a content of solid impurities have to be handled.

OPERATION

The Archimedean screw pumps operate by the rotor - rotating in the trough, being immersed at its lower end
in the liquid and scooping the liquid into the closed chambers formed by the walls of the trough and the helical blades.
The liquid is moved from the intake level to the outlet level.

DESIGN

The Archimedean screw pumps consist of a screw rotor, inclined 30°- 38° to the horizontal plane, which is mounted in an upper and a lower bearing and of a semi-cylindrical trough.

Rotor: Double or triple fins are welded to the cylindrical shaft. The upper end of the cylindrical shaft is fixed with a peg for installation into the bearing.
The lower part is also fastened with a pin which has an exchangeable sleeve

Semi-cylindrical trough: With smaller sized pumps, the trough is made of metal sheet with integrated stop-anchors for securing it to the foundation. With large sized pumps, the trough is made of concrete which may be faced with abrasion resistant tiles (basalt, etc.) or stainless steel plates when necessary. The right side of the concrete trough (viewed from the drive end) is protected with a steel angle, and on the left side of the trough a plate is mounted that prevents splashing.

Upper bearing: The bearing takes up the thrust and the radial force. It is an anti-friction bearing, grease lubricated. The lubrication is done according to the directions given in the assembling and operating instructions.

Lower bearing: The bearing is a plain bearing that is lubricated with grease by means of a lubricator accommodated in the engine room. With the YBA 2250 size, the lower bearing is an anti-friction bearing.

MATERIAL OF STANDARD DESIGN
The main parts of the pump are usually made of structural steel or cast steel, the less highly stressed parts of cast iron.
The surface of structural steel can be zinc coated and painted.
The screw, tube, splash plate and trough can be made in special cases of stainless steel.

DRIVE OF THE PUMP
The pumps run clockwise (viewed from the drive end). They are driven by an electric motor through a gear box.
With small pumps, electric gear motors are used. Flexible couplings are inserted between the individual parts of the drive and the pump. The screw pumps are designed individually for each length. A binding dimension drawing is also issued for each length after the order.

DIMENSIONS OF THE PUMPS
The pumps are produced in two dimensional versions: