Circular rotor 1 rotates about fixed axis A, eccentrically located with respect to the geometric axis of housing 4. Rotor 1 has a slot in which vanes 2 and 2' slide freely. Vanes 2 and 2' are connected by turning pairs C and C' to annular sectors 3 and 3' which slide around a slot inside housing 4. The suction and discharge chambers are formed between vanes 2 and 2', housing 4 and rotor 1.
$3821$LHP,RP$