Mechanical structure and use of submersible pumps

Update: 24-08-2019

Mechanical structure The submersible pump unit consists […]

Mechanical structure
The submersible pump unit consists of four parts: the pump, the submersible motor (including the cable), the water pipe and the control switch. The submersible pump is a single-suction multi-stage vertical centrifugal pump; the submersible motor is a closed water-filled wet and vertical three-phase squirrel cage asynchronous motor, and the motor and water pump are directly connected by a claw type or a single-key cylinder coupling; Three-core cable; the starting equipment is air switch and auto-coupling decompression pneumatics of different capacity grades. The water supply pipe is made of steel pipes of different diameters. It is flanged and the high-lift electric pump is controlled by gate valve.
The upper part of the submersible motor shaft is equipped with a labyrinth sand control device and two returning assembled skeleton oil seals to prevent the flow sand from entering the motor. The submersible motor adopts water-lubricated bearings, and the lower part is equipped with rubber pressure regulating film and pressure regulating spring to form a pressure regulating chamber to adjust the pressure change caused by temperature; the motor winding is made of polyethylene insulation, the nylon household is resistant to water electromagnetic wire, and the cable connection mode is pressed. Cable joint process, the joint insulation is removed from the scraped paint layer, respectively, the welding is firm, and the raw rubber is wound around the layer. Then use 2-3 layers of waterproof adhesive tape, 2-3 layers of waterproof tape on the outer bread or a layer of rubber (bike tire) with water glue to prevent water seepage.
The submersible pump is equipped with a rubber bearing in each of the diversion shells; the impeller is fixed on the pump shaft by a cone sleeve; the diversion shell is integrally formed by 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 the water hammer. The motor is sealed, precision bolts are used, and the cable outlet is sealed with a rubber pad. The upper end of the motor has a water injection hole with a venting hole and a drain hole at the lower part. The lower part of the motor is equipped with upper and lower thrust bearings. The thrust bearing has grooves for cooling, and its stainless steel thrust plate for grinding, which is subjected to the vertical force of the pump.
Mechanical use
The choice of the submersible pump before use is very important. The model of the pump should be selected according to the actual conditions of the water source and the working time and pumping capacity. First, the head should be selected to be larger than the difference between the water intake and the water outlet; secondly, the flow of the pump should meet the requirements of drainage and irrigation.