BOREHOLE LINEAR MOTOR Russian patent published in 2015 - IPC F04B47/06 H02K41/02 

FIELD: engines and pumps.

SUBSTANCE: motor comprises sealed stator with two cores with coils, current lead-in and head for coupling with pump. Sais stator accommodates moving rod including connecting threaded bar for coupling with pump plunger and active sealed slider connected by thread joint with rod made in coupling. Slider comprises axially magnetized magnets and poles made of structural steel fitted on the pipe. Magnets and poles are divided into working stacks interconnected by couplings. Said rod is arranged in inner pipe made of stainless steel with honed surface to make the clearance between the latter and rod surface. Said head is coupled with stator body by thread joint via sealed spacers provided with channels. Compensator with resilient diaphragm is secured to stator bed. Said diaphragm is composed of a bubble with mid diameter larger than that of its each ends. Note here that one end of said diaphragm is coupled with stator bed while its opposite end is jointed with coupling connecting the motor with pump.

EFFECT: higher reliability of operation in bed fluid at increased temperature.

3 dwg