IMMERSION MULTI-SECTION PUMP UNIT Russian patent published in 2003 - IPC

FIELD: mechanical engineering, in particular, applicable for lifting of liquid from wells or for its injection into the well in seam pressure plants. SUBSTANCE: the unit has successively interconnected pump sections, electric motor and hydroprotection. The section bodies in the point of their joint are made at least with three similar outer bulges uniformly arranged in the circumference of the end part of each body and are interconnected by a coupling, whose end parts are made evenly distributed in the circumference by inner bulges. The profile of the latters repeats the profile of the bulges on the bodies of the sections. The bulge on one end part of the coupling is positioned from the bulge of the other end part at a distance providing for arrangement of the bulges of the joined bodies of the sections between the mentioned bulges. The sections are matched beforehand so that the lower surfaces of the bulges an the body of one section adjoin the upper surfaces of the bulges on the body of the other section. The adjoining bulges of the two bodies of the adjoined sections and the bulges of the coupling are matched in the axial direction, and the bulge spaces form slotted cavities, installed in which inserts preventing displacements of the bulges in the radial direction. EFFECT: enhanced reliability of joint of the unit sections, simplified construction and manufacturing process. 2 cl, 8 dwg