SU142531A1 - Electric submersible pump - Google Patents

Description

Known are electric high-immersion submersible pumps consisting of a multistage pump unit with unloaded impellers connected to a wet-type electric motor.

A distinctive feature of the described pump is that it uses a hydromechanical thrust bearing consisting of a tapered heel with a conical bolster and a discharge disc, which with a RING and a motor cover form a hydraulic discharge chamber filled with fluid supplied under pressure through a mechanical cleaner and hollow pump motor shafts.

In the submersible pasos of this design, the axial pressure arising during the operation of the pump unit with unloaded impellers is perceived by the hydromechanical thrust bearing.

In addition, a centrifugal wheel for mechanical water purification is used in the pump, which is used for hydraulic unloading and cooling of the electric motor's field, as well as sealing of the lamp motor, which, when installed at the ends of the hydraulic shafts, eliminates leakage of water from them.

The drawing shows schematically the described submersible pump in the section.

A pump unit driven by an electric motor includes a rotor made in the form of a hollow shaft / with fixed centrifugal impellers 2 and a centrifugal wheel 3 for mechanical purification of water supplied for the hydraulic unloading of the pump unit and cooling of the electric motor. A centrifugal wheel for mechanical cleaning of water and. Has radial blades and ring-D1: afrag., Which, after installation on the shaft, forms a chamber. There are holes in the ring for the passage of water. The hollow shaft of the rotor in the area of the chamber of the ring also has holes 5 (drilling) for the passage of water into its central cavity. In the lower part of the shaft, on the front side, a rubber cuff 6 (seal) of a type is installed in the undercut, eliminating water leakage at the junction of the pump rotor shaft with the shaft 7 of the upper rotor of the electric motor. The axial pressure arising from the operation of the pump is perceived by the hydromechanical thrust bearing of the electric motor, including the stator 8, the upper and lower rotors 9 and 10, located in the bearings //, 12 and 13. The hydromechanical thrust bearing consisting of . Bushing 14 with heel 15 and discharge disc 16. Radial grooves with bevels in the direction of rotation of the heel are provided for water circulation and cooling of the bolster and heel in the discharge disc. The discharge disc mounted on the shaft of the bottom pt, with the bottom cover 17 located on the housing 18, forms a hydraulic discharge chamber. A bronze ring 19 is pressed into the housing cover, in which there is a recess for the annular protrusion of the disk, which forms a labyrinth seal. The gap between the bronze ring and the disk depends on the mode of operation of the pump and, due to the limitation of water flow by the clamp 20, is automatically set. Inside the shaft of the upper rotor of the electric motor and in the bearing housing 21, spring-loaded ball valves 22 and 23 are installed. When the electric motor is switched on, the shaft begins to rotate with pump impellers that suck water through the inlets 24 in the housing and pump it through the lifting pipes to the ground surface. Under the action of the pressure developed by the pump, part of the water pumped out by the pump, overcoming the centrifugal force generated by the centrifugal mechanical cleaning wheel, flows through the hollow shafts into the discharge chamber of the electric motor, and the mechanical impurities are carried away by the flow of pumped water.

The amount of water entering the discharge chamber is regulated by the cross section of Iputser 20 and the mode of operation of the pump. Under the action of water pressure, the discharge disk is raised, and the water continuously flowing into the discharge chamber flows through the gap between the disk and the ring into the cavity of the electric motor, cooling and lubricating the latter.

Water is discharged from the engine cavity through check valves 22. The installation in the pump of the discharge valve allows the use of non-loaded impellers, which are less susceptible to wear by abrasive particles.

The proposed submersible electric pump can be used for tubular wells with sand-bored wells, which are particularly common in agriculture and in geological surveys.

The subject is invented and

Claims (2)

1. A self-driving electric pump consisting of a multi-stage pump assembly equipped with unloaded impellers and connected to a wet-type electric motor, characterized in that, in order to perceive the axial pressure arising during the operation of the pump assembly, a hydromechanical thrust a support, consisting of a conical heel with a conical bolster and a discharge disk, forming a hydraulic unloading chamber with a ring and a motor cover, the liquid into which is supplied under pressure, developing emym pump through a mechanical cleaner and hollow shafts of the pump motor. 2. Pump according to claim 1, characterized in that, in order to deactivate the constant mechanical purification of water supplied to the guide