Submersible pumps are vertically submerged pumps driven by electric motors. The motor and pump body are combined into a single unit, making them suitable for conveying liquids with particles. They work by using centrifugal force from an impeller's high rotational speed to convert kinetic energy in the liquid into pressure energy. Axial forces in the pump are absorbed by thrust bearings in the protector and pump. Submersible pumps come in various types depending on the liquid and use vertical, inclined, or horizontal installation positions.

1. The Working Principle of Submersible Pump
Perhaps you usually use submersible pump, you think it is a common thing just like your
cloth. But have you even observed how it works? Do you know the working principle of
submersible deep well pumps? This passage will tell you the answer.
Submersible series pump is vertically submerged under water and driven by electric. It
connects pump body and motor in to a whole one. It is suitable for conveying liquid with
slurry, solid particles of gravel, cinders, tailings and groundwater or hot water extraction for
irrigation, municipal water use, etc. There many kinds of submersible pump for choose
according to different situations for example, some special work may need submersible
sewage pump. Inside the motor line packaged with oil-immersed, water immersion and dry-
type, check the instructions first before use can not go wrong.
According to medium, submersible pump generally divided into four types: submersible clear
water pump; submersible sewage pump; submersible sea water (corrosive water) pump;
submersible sand slurry pump. The installation of submersible pump includes: vertical ----
such as the general wells; inclined ----such as in the mine with inclination; horizontal ---- such
as in the river or lake.
The submersible pumps used in ESP installations are multistage centrifugal pumps operating
in a vertical position. Although their constructional and operational features underwent a
continuous evolution over the years, their basic operational principle remained the same.
Produced liquids, after being subjected to great centrifugal forces caused by the high
rotational speed of the impeller, lose their kinetic energy in the diffuser where a conversion of
kinetic to pressure energy takes place. The pump shaft is connected to the gas separator or
the protector by a mechanical coupling at the bottom of the pump. An optional thrust bearing
takes up part of the axial forces arising in the pump but most of those forces are absorbed by
the protector’s thrust bearing.
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