Method and apparatus for an end seal for increasing efficiency of a submersible multistage labyrinth-screw pump

A submersible multi-stage labyrinth-screw pump, comprising:

• a rotor shaft;
• an end seal for the rotor shaft;
• an axial unloading unit integrated into the end seal of the rotor shaft;
• a lower radial bearing, wherein the axial unloading unit is located before the lower radial bearing of the rotor;
• a longitudinal channel, which connects a high-pressure zone at an exit for the rotor and a chamber of the axial unloading unit of the shaft, the axial unloading unit comprising a thrust block with a wear-resistant insert, a thrust collar, mated with a segment of the end seal, an end seal housing, a spring, a thrust ring, and a seat sleeve of the end seal, wherein the end seal of the rotor shaft's axial unloading unit operates as follows, when high pressure appears in the chamber of the rotor shaft's axial unloading unit, fluid is kept from unproductive flows by a hermetic contact of a ground insert of a segment and a seat of the end seal, with the contact being maintained by a constant force of the springs when the rotor shaft of the pump rotates, wherein the end seal seals off the chamber of the axial unloading unit is achieved, significantly enhancing its efficiency.