AXIAL-FLOW VORTEX PUMP Russian patent published in 1994 - IPC

FIELD: power engineering. SUBSTANCE: pump has cylindrical housing 1 where shaft 3 endless screw 4 secured on it and fixed grate 6 with blades whose twisting is opposite to that of blade of endless screw 4 are arranged. Diameter of inlet branch pipe 2 is no less than maximum diameter of blades 7. Circular area occupied by blades of grate 6 in section perpendicular to axis of rotation is 0.5 to 1 of the respective area of blades of endless screw 4. Pitch of blades of endless screw 4 may be equal to or unequal to pitch of blades of grate 6. EFFECT: increased pressure head of pump and avoidance of pressure fluctuation. 2 cl, 3 dwg