FIELD: rotary pumps. SUBSTANCE: mounted in hollow stator is cylindrical rotor for rotation and forming varying clearance between inner surface of stator and outer surface of rotor. Dividing members are mechanically linked with rotor and are received by clearance. Clearance has one minimum and one maximum magnitudes within angle 2π. Dividing members are made in form of flexible cavity-containing structure secured on rotor for change of its volume. EFFECT: enhanced reliability. 7 cl, 6 dwg
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