FIELD: pump engineering. SUBSTANCE: vortex pump has housing 1 provided with inlet and outlet branch pipes 2,3 arranged symmetrically with respect to the axis of pump, working space made as screw passages, vortex wheel 5 lengthened along the axis of housing 1. Some screw passages are inclined to the rotor axis of the pump at 72 ± 2° and their angle of divergence is equal to 3-5 deg. The passages have alternative depth which increases over the whole length of the housing in the direction to outlet branch pipe 3. EFFECT: enhanced efficiency. 2 cl, 1 dwg
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