Berstorff Gmbh

A-z Formen-und Maschinenbau Gmbh

Vmi-az Extrusion Gmbh

Olaf Skibba

Reinhard Uphus

The invention relates to a gear pump which is suitable for delivering highly viscous materials. The aim of the invention is to provide a gear pump having a low-wear and low-maintenance bearing system, high output and good self-cleaning properties. For this purpose, the gear pump according to the invention comprises a housing, a gear section comprising a sun wheel and a plurality of stationarily mounted planet wheels, an input screw section comprising an input screw shaft linked with the sun wheel in a rotationally fixed manner and an input transfermix area, and an output screw section comprising an output screw shaft linked with the sun wheel in a rotationally fixed manner and an output transfermix area. The screw shafts, in the transfermix areas, have flight depths that decrease toward the gear section. In the housing, flights are configured which extend in an opposite direction relative to the screw shafts, which have increasing diameters towards the gear section and which end each between the planet wheels.

Gear pump having input and output screw shafts with a decreasing flight depth toward a gear section in transfer mix areas

An extruder is provided having a transfer region that, in an extruder sleeve, is provided with ribs between which extend flow channels. Disposed opposite the sleeve flow channels are flow channels formed in the extruder screw, and the sum of the cross-sections of the flow channels, when viewed in the direction of extrusion, is shifted toward the sleeve and then toward the screw. The ribs () of the extrusion sleeve () at the ridges facing the screw () have a width that is at least one third, especially at least one half, and preferably approximately 80 to 100% of the width of the flow channels (). Provided between the ridges of the ribs () of the extruder sleeve () and of the screw () is a gap () of more than 0.5%, in particular of about one percent of the diameter of the screw ().

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Hannover, Germany

Olaf Skibba