| 摘要 |
FIELD: aircraft industry. ^ SUBSTANCE: invention relates to pumping to pumping units designed to transfer liquids with gas and/or vapor inclusions, mainly fuel, in aircraft power plants. Pumping unit contains centrifugal pump and ejector pump installed coaxially before centrifugal pump. Ejector pump has head with great number of nozzles. Channels to supply high-pressure liquid to nozzles of ejector pump is connected directly to channel to let out high-pressure liquid to consumer. Head with nozzles is made in form of cylindrical bushing in which nozzles are arranged over circumference at maximum distance from head axis. Centrifugal pump impeller is made in form of auger with constantly increasing diameter of outer surface of blades from inlet to outlet liquid. ^ EFFECT: increased pressure differential across nozzles of ejector pump at minimum liquid pressure at inlet into pumping unit, increased efficiency of pumping unit in operation at reduction of its overall dimensions. ^ 10 cl, 9 dwg |
