Patent ID: 6406281
Filing Date: 2002-06-18
Classification: F04C

Abstract:
Screw-type pumping unit for treatment of fluids in several phases, comprising a pumping chamber, inside which there are accommodated at least two screws, wherein one of the said screws is a drive screw, and supports at one of its ends at least one first gear, which engages with at least one second gear, which is associated with a driven screw, wherein the connection to one another of the said screws permits pumping of a mixture of liquid and gas from at least one intake mouth to at least one outlet mouth, said first and second gears being contained in a casing which is fitted onto them, and is provided. with at least one first through hole, through which oil is admitted into the said casing, and at least one second through hole, through which the lubrication oil can be discharged, such that the said casing, together with the said gears, forms a gear pump which can keep the lubrication oil of the said pumping unit circulating, said pumping chamber further comprising an outer case, which accommodates an inner case, which is connected to the said outer case by means of flanges between the said inner case and the said outer case, at least one supply chamber being formed, into which the said mixture can enter via said at least one intake mouth, the said at least one supply chamber being connected to the said pumping chamber inside the said inner case, the latter being connected in turn by means of at least one through hole to at least one delivery chamber, which is provided with said at least one outlet mouth through which, after having been treated by the said pumping unit, the said mixture is conveyed to a delivery pipe.