Submersible Pump Mechanical Structure

The submersible electric pump unit consists of four parts: water pump, submersible motor (including cables), water pipe and control switch. The submersible pump is a single-suction multi-stage vertical centrifugal pump; the submersible motor is a closed water-filled wet type, vertical three-phase squirrel-cage asynchronous motor, and the motor and the pump are directly connected through a claw-type or single-key barrel coupling; equipped with different specifications Three-core cable; the starting equipment is an air switch of different capacity levels and an auto-coupling decompression pneumatic device; the water delivery pipe is made of steel pipes of different diameters, connected by flanges; the high-lift electric pump is controlled by a gate valve.
The upper part of the submersible motor shaft is equipped with a labyrinth sand control device and two skeleton oil seals assembled in reverse to prevent quicksand from entering the motor. The submersible motor adopts water-lubricated bearings, and the lower part is equipped with a rubber pressure-regulating film and a pressure-regulating spring to form a pressure-regulating chamber to adjust the pressure change caused by temperature; the motor winding is insulated with polyethylene, and the nylon household is covered with water-resistant electromagnetic wires. The cable connection method is according to In the cable joint process, remove the insulation of the joints and scrape off the paint layer, connect them separately, weld them firmly, and wrap a layer with raw rubber. Then wrap 2-3 layers with waterproof adhesive tape, and wrap 2-3 layers of waterproof tape on the outside or wrap a layer of rubber (bicycle inner tire) with water glue to prevent water seepage.
A rubber bearing is installed in each diversion shell of the submersible pump; the impeller is fixed on the pump shaft with a cone sleeve; the diversion shell is connected into one body with threads or bolts. The upper part of the high-lift submersible pump is equipped with a check valve to avoid damage to the unit caused by water hammer during shutdown. The motor is airtight, and the precision seam bolts are used, and the cable outlet is sealed with a rubber pad. There is a water injection hole at the upper end of the motor, an air discharge hole, and a water discharge hole at the bottom. The lower part of the motor is equipped with upper and lower thrust bearings. There are grooves on the thrust bearings for cooling, and the stainless steel thrust discs it grinds against, bear the upper and lower axial forces of the water pump.