1. Water lubricated bearing support structure. With the support of water lubricated bearing water filling submersible pump motor part of the overall structure and the structure of wells with water filled submersible motor is similar to the structure and material of key parts are basically the same, relevant content can refer to the third section of this chapter.
2. Rolling bearing support structure. The submersible pump rolling bearing grease lubrication, this is a kind of pump type submersible pump. The upper part of the submersible pump to pump parts, including the impeller, pump body, pump cover, pipe fittings and pump seat (Water Festival) and several other parts; lower electric pump for water filling type vertical cage asynchronous motor, the overall structure and the ordinary vertical cage asynchronous motor, comprises a stator, a rotor and upper and the end cover and bearing support structure. Because the motor is filled with water, the stator windings, rotor and bearings must work in the water. Stator winding is generally used SQYN type copper conductor PE insulated nylon sheath waterproof winding wire or SV type solid copper conductor PVC insulation waterproof winding wire made. Rolling bearing is filled with lubricating oil is not easy to hydrolysis, both with rubber seal (or single mechanical seal) sealed to prevent water entering the bearing seal cavity, resulting in the deterioration of lubrication of rolling bearing. The stator lamination and stator core and rotor surface are treated with water resistant coating for corrosion prevention and corrosion protection. The surface of the metal parts is treated with anti rust coating or plating process, in order to prevent the corrosion of the metal.
In a rolling bearing water filling submersible pump has the advantages of simple structure, stator winding insulation wire has excellent insulating properties and water resistance, shaft end seal is mainly to prevent sand impurities in the water into the motor cavity, the shaft extension end sealing requirements are decreased, but the winding wire insulation and corrosion demanding; with the higher requirement on the rust parts and the surface of the rotor in the machine; the length of life of rolling bearing used in the water surrounded by environment directly affects the reliability of the rolling bearing by using water filling submersible pump and service life.
