WELL LIQUID LIFTING PUMP Russian patent published in 1997 - IPC

FIELD: oil producing industry; mechanical engineering; submersible diaphragm electric pumps. SUBSTANCE: compensating diaphragm, its body and casing are installed in upper part of electric motor. Upper endshield of electric motor is arranged in central hole of diaphragm body and is installed for axial displacement. Upper endshield has outer longitudinal slot for accommodating output leads of stator winding. Diaphragm proper is provided with circular beads on ends. Outer bead is made on upper end, and inner bead, on lower end. Diaphragm casing is installed for axial displacement to thrust against bead of diaphragm body by means of sub turned onto lower end of diaphragm body. Flexible or spring ring is installed on cylindrical part of diaphragm for radial compression of diaphragm. EFFECT: enlarged operating capabilities. 1 dwg