The small submersible electric pump is a unique pump with simple operation and compact structure, which is directly connected to the motor and the water pump, and works in the water at the same time. There are three types of submersible pumps: agricultural sewage and sewage submersible pumps (referred to as submersible sewage pumps), well submersible pumps and small submersible pumps.

Advantages of small submersible pumps:

1. Directly connected to the motor. Small submersible electric pumps even install the impeller of the pump directly on the shaft of the motor, commonly known as a conjoined pump. This can save a lot of connecting parts, shorten the axial dimension, reduce metal consumption and reduce weight.

2. There is no need to build a pump house, the installation is convenient, and the capital investment is reduced. And the submersible pump dives directly into the water, which is very convenient to use.

3. Due to the operation under water, the noise of the pump can hardly be heard on the shore. Therefore, it is suitable for water supply and drainage in places with quiet working environment such as schools and homes.

4. Not affected by weather and surrounding environment.

5. Since the well submersible pump is no longer equipped with a long drive shaft, the failure caused by the long shaft is reduced, and the reliability of the equipment is improved.

6. If a hose is used as the outlet pipe of the submersible pump, the depth of the well water can be deepened, and the diameter of the well pipe can be cut smaller.

A small submersible electric pump is a water pump that combines a motor and a water pump to work in a water body. It is characterized by small size, light weight, convenient installation, flexible movement and strong work adaptability, and has a tendency to gradually replace long-axis deep well pumps. Widely used in construction water intake.

The motor structure can be divided into four types: wet type, dry type, semi-dry type and oil-filled type. The motor of the wet submersible pump is filled with air with a certain pressure, and has a reliable sealing device, so that water cannot be immersed in the motor. Due to the complex sealing structure and high manufacturing and installation accuracy, it is not easy to repair after wear. Works better in oil or similar oily liquids.

Semi-dry submersible pump is also called canned submersible pump. A thin sleeve (made of plastic or stainless steel) is installed between the stator and rotor to seal the stator windings so that water cannot touch the stator windings while the rotor is submerged in water. It is characterized by reliable stator winding insulation and not easy to corrode. However, the large gap between the stator and the rotor and the large magnetic resistance limit the diving depth. And complex to manufacture and maintain.

The oil-filled submersible pump fills the inner cavity of the motor with liquids such as transformer oil or stator oil, which play the role of insulation, cooling and lubrication. According to the internal structure of the motor, it is divided into general sealing and pressure. The anti-corrosion requirements of the motors of the two pumps are low, and ordinary enameled wires can be used for the windings. However, the structure is complex, the rotor resistance is large, and it is easy to pollute the well water, so it is not suitable for pumping drinking water.

No matter what kind of submersible pump, the working principle of the pump body is similar, and the impeller is also composed of multiple stages in series, which pump water up step by step to increase the pressure head.