Rotary piston pump with C-shaped pump chamber

摘要

A C-shaped, annular, rotary piston (6), is fitted in chamber (2), gripping a strap (5). The piston form sickle-shaped work chambers of variable vol. The end sections of the pump chamber contain inlet (9) and outlet apertures (10), with at least one radially enlarged towards the chamber strap. The enlargement of the apertures prep. is formed by an instant widening (14). A groove (13) may lead from the strap into the pump chamber.