REDUNDANT ELECTRICALLY DRIVEN PUMP UNIT Russian patent published in 2010 - IPC F04D13/14 

FIELD: engines and pumps.

SUBSTANCE: proposed unit comprises housing 1, two coaxial rotary electrically driven pumps 6, 7. Pumps 6, 7 consist of motors 8, 9 with impeller 10, 11 and hub 12, 13 with volute 14, 15 at their first end face 16, 17. Two-way check valve 26 is arranged between outlets 24, 25 of pumps 6, 7 and made integral with case 1 of baffle 27 separating inlets 22, 23 of pumps 6, 7. Switching element 29 is arranged in through axial channel 28 of said baffle 27. Hole of outlet branch pipe 3 communicates via channel 28 and that inlet branch pipe 2 communicates with hole 30 of baffle 27. Outer surface of every bush 12, 13 has transition groove 32, 33 communicating volute 14, 15 arranged on second end face 20, 21 of bush 12, 13 via diffuser groove 34, 35 with its end communicated with outlet of channel 28 terminating at the wall of baffle 27. Liquid feed hole 18, 19 of every bush 12, 13 communicates with outlet of hole 30 directed towards the wall of baffle 27.

EFFECT: higher anti-cavitation properties along with unchanged sizes and simplified design.

4 dwg