SUBMERSIBLE OIL-FILLED ELECTRIC MOTOR Russian patent published in 2001 - IPC

FIELD: driving submersible pumps for oil extraction engineering. SUBSTANCE: motor has head incorporating stuffing arrangement. The latter has plug whose shroud is attached to head. Pins are connected to cable and to plug socket. The latter incorporates insulating terminal block and sleeves connected to stator winding leads. Terminal block and sleeves are stuffed with packing material. Novelty is that terminal block has axial through hole accommodating transfer valve to provide communication between motor interior and space enclosed between plug and terminal block as well as to isolate motor interior from the latter. Transfer valve is made in the form of spring-loaded rod whose top abuts against plug shroud or in the form of flexible plug. EFFECT: improved motor reliability due to better wiring. 3 cl, 3 dwg