Submersible pump is the pump and motor closely integrated into one common diving operation of the unit. Usually based on the relative position of the pump and the motor can be divided into submersible pump on the pump and pump the two main structures. (A) on the pump submersible pump structure Pump above, the motor below. This structure is conducive to reducing the radial size of the pump, it is mostly used in well submersible pumps and small submersible pump. In the pump submersible pump structure, usually using wet submersible motor. Motor cavity filled with water, transformer oil or spindle oil, the stator coil with reinforced insulation oil, water resistant enameled wire wound. Fixed rotor immersed in liquid operation, the motor outside was flooded, cooling conditions are good. Wet motor bearings can be used plastic bearings or rolling bearings. The shaft extension and bearing seal with a skeleton oil seal or mechanical seal, the seal only from sediment and dirty water, the structure is simple. Wet submersible pump more thoroughly solve the electromagnetic part and the bearing part of the sealing problem, promote the application earlier. However, the water friction loss of the stator and stator in the wet motor is larger and proportional to the fifth power of the rotor outer diameter. So usually made of slender type to reduce friction loss, improve motor efficiency. (B) under the pump submersible pump Pump located below the motor called the pump submersible pump, usually it can be divided into two types of built-in and external. Built-in pump submersible pump delivers the liquid first through the motor surrounded by the annular flow, so that the cooling motor and then out of the pump pressure outlet. This pump even in the case of drained suction sump, but also do not have to worry about motor heating, so the scope of application is expanding. The submersible pump submersible pump discharges liquid directly from the pressure chamber behind the impeller or at the outlet of the guide vane. The motor is also cooled by the pumped liquid. As the pump structure can work in the lighter liquid, it is often used in submersible electric pump, especially it is the main structure of large-diameter submersible pump. For sub-pump submersible pump, because it can be used in the process of mass production of ordinary dry three-phase asynchronous motor, the seal on the reverse motor housing mating surface with "O" rubber seal closed, the output The shaft extends from the lower end. The shaft extension is provided with a mechanical seal rotating in the sealing liquid, usually one to three single-end or double-end mechanical seals to strictly prevent the transported liquid from entering the motor cavity along the shaft. In the early days have also used a gasketed seal structure, the lower end of the motor has a gas sealed chamber, which is connected to the outside world by several channels, the pump sneaked into the suction liquid pool, the air inside the sealed chamber formed under the action of liquid pressure outside the body Air cushion to prevent liquid from entering the motor cavity. Under the pump submersible pump mechanical seal is located in the outlet flow high pressure zone, the higher the head, here the higher the water pressure, so the mechanical seal performance by the lift control.
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