The explosion-proof pump is composed of important components:
Stator
Internally, the stator is a crucial component, as it is stationary, hence the name "stator." The stator consists of the casing, stator iron core, and stator winding. Three-phase AC power is transmitted through cables to the stator winding, where a rotating magnetic field is generated within the iron core. The casing is typically made by casting, rolling steel plates, and welding, or directly machined from seamless steel pipes. Reinforcing ribs are often set on the casing, and the casing's mating surface must be concentric with the inner circle of the iron core. The stator iron core serves as the magnetizing medium for the motor.
Rotor
The motor in explosion-proof centrifugal pumps is the key to operation. The interaction between the current in the rotor and the rotating magnetic field of the stator generates an electromagnetic torque, causing the motor to rotate. The rotor is composed of components such as the rotor core, balancing washer, and shaft. The rotor core serves as the magnetic guide for the motor, made by stacking silicon steel sheets and mounted on the shaft. The core is fixed in both the axial and circumferential directions to the shaft keys, preventing relative movement.
Air gap
The stator and rotor have a small but uniform air gap in the radial direction. The air gap significantly affects the motor's performance. Using a smaller air gap can increase the excitation current and improve the power factor. However, considering the manufacturing process, the air gap is generally 0.6mm, depending on the power rating. For high-power explosion-proof water pumps, the air gap can reach 1.8mm, depending on the specific situation.
Bearings
The bearings of explosion-proof water pumps bear the weight of the rotor, as well as additional radial and axial forces during pump operation. Once the bearings are damaged, the sealing and impeller mouth rings of the submersible pump quickly fail. Due to the power factor, there is a significant difference in the design philosophy of bearings, but the principle is all to bear radial and axial forces through roller bearings.
Daily maintenance of submersible pumps. Check for any damage to the power cord daily and prohibit submersible pumps from being used if there is a risk of electric leakage. Inspect the pump body for damage daily to ensure the motor operates without leakage. After operation, promptly clean any debris attached to the pump and rinse it thoroughly. To ensure the normal operation of the submersible electric pump, it is mandatory to follow the following requirements. Before using the submersible electric pump, check the motor's insulation resistance with a megohmmeter, and the value should not be less than 50MΩ.
