FIELD: engines and pumps.
SUBSTANCE: invention is designed to be used in pumps to pump liquid, e.g. petroleum, from gravity-feed capacities of collecting leaks. The centrifugal screw pump incorporates a main pump with an intake line and a booster pump arranged on the said pump. The main pump is an, at least, one-stage centrifugal pump incorporating a constant pitch cylindrical screw booster pump. The centrifugal pump is an axial radial pump. The booster pump is constant pitch screw pump incorporating a fixed sleeve with blades directed opposite to the direction of the booster screw blades, the sleeve enveloping the booster pump.
EFFECT: operation of the centrifugal screw pump in pumping out at reduced inlet pressure and simpler design.
2 cl, 7 dwg
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