MIXED-FLOW INCLINED ARCHIMEDEAN SCREW PUMP Russian patent published in 1999 - IPC

FIELD: water supply and waste-water systems in petrochemical, atomic and other branches of industry. SUBSTANCE: invention refers to pumping of fluids with high anticavitation and energy properties having increased viscosity and carrying mechanical impurities. Mixed-flow inclined Archimedean screw pump has body including supply and tapping conduits, screw wheel with helical blades and hollow cone-shaped bushing bordering with bigger diameter on body through seal and forming balancing chamber with relief conduits put on shaft and bearing unit. Body of bearing unit is partially placed inside bushing and is sealed on shaft with reference to balancing chamber. Inner surface of supply part is conical and expands towards tapping part and outer surfaces of wheel outlined by blades during its rotation are conical with diameter growing from inlet to outlet, located in opposition to conical surface of supply part and are cylindrical across outlet from wheel. Blades are positioned perpendicular to conical surface of supply part. End face seal is arranged between bushing and body. Drain chamber communicating with its lower part with atmosphere and located between seal on shaft and bearing bordering on seal is made in body of bearing unit. EFFECT: prevented choking up of pump with particles of impurities, decreased wear-out of flow part. 3 cl, 1 dwg