Nuovo Pignone Holding S.p.a.

Corrado Palarchi

Vasco Mezzedimi

Gianpietro Ferrari Aggradi

A screw-type pumping unit ( ) for treatment of fluids in several phases comprises a case ( ) which contains a pumping chamber ( ), inside which there are accommodated at least two screws ( ), one of which ( ) is a drive screw, and supports at one of its ends a first gear ( ), which engages with a second gear ( ), which in turn is supported at one end of a driven screw ( ). The first and the second gear ( ) are contained in a casing ( ) which is fitted onto them, and is provided with at least two through holes ( ) produced in two substantially opposite portions, through one of which oil can be admitted into the casing ( ), and wherein the oil can be discharged through the other through hole ( ), such that the casing ( ), together with the gears ( ), forms a gear pump which can keep the lubrication oil of the pumping unit ( ) circulating.

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Florence, Italy

Corrado Palarchi