COMBINED MULTISTAGE RADIAL-FLOW PUMP Russian patent published in 2012 - IPC F04D1/06 

FIELD: engines and pumps.

SUBSTANCE: proposed pump comprises housing made up of three parts 1, 2, 3. Said components have annular joints 4, 5 jointed together by studs 6, 7. Housing parts 1, 3 have suction and pressure branch pipes 8, 9. Two independent shafts 10, 11 are arranged along housing axis. Impellers 12-15 of different stages are fitted on shaft 10 to make high-pressure pump with guides 16 and sections 17. Topping impeller 18 and impeller 19 are fitted on shaft 11 to make low-pressure pump with guide 20. Housing medium part 2 has internal radial ledge 21 with opening made at its center. Ledge 21 is arranged between high- and low-pressure pumps. Guide vane has axial ledge 23 with flat base. Shaft 10 is fitted downstream of opening 22. Bulged and round end of said end is located at tip 24. Shaft end tip 24 is directed toward opening 20. Impellers 12-15 and 18, 19 are directed in one direction. Both shafts 10, 11 have one drive end 25, 26. Shaft 11 is provided with turbine 27.

EFFECT: improved design, higher operating performances, longer life.

4 cl, 1 dwg