VOLUMERIC IMMERSED PUMP WITH ELECTROMOTOR VOLUMERIC IMMERSED PUMP WITH ELECTROMOTOR

This invention relates to the immersed pumps intended for stratal liquid lifting from wells. The volumetric action pump with electric motor has a cylindrical housing, working chamber, suction chamber,spring, inlet and discharge units, working cylinder, piston, shaft, bearing box. The last one comprises of a cup where there are placed radial bearings and the shaft. On the upper flat end of the cup there are balls contacting with the rings. The rings are placed on the shaft and have profile concentric tracks in which the rollers roll. From the above a two-wall cup rests on the rollers with the slant end surfaces. The slants of the ends of the walls of the cup are cut in such a way that those are turned one with respect to another by 1800. In the upper part of the two-wall cup piston is fixed. The cylindrical housing, together with the piston, worm the working chamber. The back spring, through the piston, presses the two-wall cup to the rollers. The suction valve is placed in the piston, the pressure valve is placed in the upper cover. Due to the fact that the piston rests on two rollers, the shaft and the piston are unloaded from radial loads. Slide friction is replaced by rolling friction, this decreases power losses and wear of parts.