ROTARY MACHINE Russian patent published in 1994 - IPC

FIELD: pumps. SUBSTANCE: stop ring with a profile inner surface is positioned in a casing. A rotor with slots is concentrically mounted on a shaft in the ring. Partitions are movably positioned in slots to form working chambers. A hollow is made in an end cover in the zone of each bleed channel. A discharge valve is made in the form of a seat fastened in the hollow, a restricting bush with radial slots mounted on the seat, and a cylindrical cavity located on the side of the seat. A plate is freely located in the cavity. The inner cavity of the bush communicates with the cylindrical cavity of the bush by radial slots. The cavity height is determined from a specified equation. EFFECT: improved structure. 4 dwg