Patent ID: 8202070

Claim:
A positive displacement rotary machine comprising: a body with a spherical working surface having bypass and discharge parts; a rotor with a rotor working surface rotatably mounted in the body; a ring working cavity formed by the spherical working surface and the rotor working surface; a separator embodied in the form of a washer, fastened in the body at an angle to the plane of the rotor rotation and dividing the ring working cavity into two parts; the separator is conditionally divided into an ascending area and a descending area, located at the bypass and the discharge parts of the body accordingly; and working medium inlet and outlet openings are located on the opposite sides of the ascending area of the separator; the rotor working surface is provided with at least one slot along its geometrical axis of rotation; and a piston, capable of closing off (sealing off) the ring working cavity and performing rotational oscillations in a plane of the at least one slot, is mounted in each of the at least one slot; the piston is made at least in the form of a part of a disk and there is at least one sealing through-slot for a separator passage in the piston; and also at least one through-pass for a working medium flow, from one separator side to the other is made in the descending area of the separator.