LABYRINTH PUMP Russian patent published in 2003 - IPC

FIELD: heating and water supply systems. SUBSTANCE: proposed labyrinth pump contains concentric cylindrical working members in form of rotating screw and fixed bushing with multistart thread cuts of opposite directions. Angles of cuts of bushings are smaller than angle of cuts of screw and compose, in sum with angle of screw cuts, angle of 90^o. profile of screw cuts can be trapezoidal and profile of bushing cuts, isosceles triangle with sizes of cuts two-fold smaller in height and width cuts of screw. Pump can be furnished with bushing built into inner space of screw and made with channels in form of multistart Archimedean spiral with width of channels two times less then their height. EFFECT: enlarged operating capabilities of pump. 3 cl, 4 dwg