POSITIVE-DISPLACEMENT PUMP Russian patent published in 1994 - IPC

FIELD: pumps. SUBSTANCE: drive drum is mounted in a sealed chamber with pressure and suction manifolds, and a working agent feed system. A displacement device in the form of a hose is wound on the drum, the end of the hose is fastened in the chamber. One of the sides of the displacement device is made from polytetrafluoroethylene fibers, its wrong side - from polyvinylalcohol fibers and is connected with the face side through two pattern repeats. The fibers of both sides have from four to twelve folds. The space between the fibers is filled with a polyurethane mass. EFFECT: improved structure. 2 dwg