Comparative analysis of the internal loaded submersible pump and the ordinary submersible pump

A built-in type submersible pump is a type of submersible pump, the fenced in and outside a motor pump shell (motor and pump shell can also be made into a whole, into a ring structure), mounted on the pump outlet cover (or water Festival). The built-in electric submersible pump from the pump, motor, sealing, cooling water jackets, pump motor is located in the upper part of three-phase asynchronous motor.
The built-in submersible pump in the lower part of a multi-stage centrifugal impeller radial diffuser structure; two independent mechanical seal between the pump and motor, seal the mouth of the fixed stop using the "O" shapedrubberringasstatic sealingoil; motor coat with steel cooling water pump work when the water from the water jacket and the gap between the motor through a cooling effect on the motor and the bearing, so the electric pump can work the upper surface. The liquid flows through the annular space between the pump casing and the motor frame upward flow, direct cooling motor base surface, the water outflow cover.
The built-in motor cooling effect of submersible pump, on occasion, large area ground drainage long time good effect and high reliability, and the pump shaft by the hard chrome plating, not easy to wear, corrosion, maintenance and easy dismantling of the impeller. The electric pump has the advantages of compact structure, small volume, convenient movement, high lift, and the like.
Submersible pump is installed inside the motor installed outside the pipe as the water channel, then discharged directly from the liquid pump drainage pipe, not through the motor when the motor is running out of the water surface, poor cooling it. In order to improve the cooling conditions of external mounted electric submersible pump, often large power motor base made of jacket type, will be part of the introduction of a liquid pump outlet cooling motor sleeve clamp. When the surface of the electric motor is exposed, the cooling effect is better, but the cooling effect is less than that of the built-in type submersible pump.
At present, the domestic production of QX submersible pumps and QDX type submersible pumps and most of the QW and WQ type submersible sewage pumps are all belong to the external installation of submersible electric pump.