HELICAL GYRATOR HYDRAULIC MACHINE Russian patent published in 2002 - IPC

FIELD: oil industry; hydraulic machinery engineering; helical gyrator hydraulic machines. SUBSTANCE: helical gyrator hydraulic machine includes holder with inner surface made from elastic material ( for example, pipe with rubber coat vulcanized to inner surface) and screw located inside holder which is made from harder material as compared with inner coat (metal, for example). Hydraulic machine is provided with elastic diaphragm (rubberized, for example) located between screw and inner surface of holder for filling with anti-corrosive medium, oil for example. Position of diaphragm does not depend on rotation of screw. During rotation of screw of helical gyrator hydraulic machine, formation fluid passes to cavities between inner surface of diaphragm and holder; diaphragm is not revolving at this but performs oscillatory motions. EFFECT: enhanced durability of working members; reduced expenses for manufacture, maintenance and repair. 1 dwg