It consists of six parts: impeller, pump body, pump shaft, bearing, sealing ring, and packing box.

1. The impeller is the core part of a centrifugal pump, with high rotational speed and high output. The blades on the impeller play a major role, and the impeller needs to undergo static balance experiments before assembly. The inner and outer surfaces of the impeller should be smooth to reduce friction losses caused by water flow. According to its mechanical structure, it can be divided into three types: closed, semi closed, and open. Closed impeller is suitable for conveying clean liquids; Half closed and open impellers are suitable for conveying suspensions containing solid particles, and these pumps have low efficiency

2. The pump body, also known as the pump casing, is the main body of the water pump. It plays a supporting and fixing role and is connected to the bracket for installing bearings.

3. The function of the pump shaft is to connect the coupling with the motor, transmitting the torque of the motor to the impeller, so it is the main component for transmitting mechanical energy.

4. The sliding bearing uses transparent oil as a lubricant and is filled to the oil level line. Too much oil will seep out along the pump shaft, and too little bearing will overheat and burn out, causing accidents! During the operation of the water pump, the maximum temperature of the bearing is 85 degrees, and it is generally around 60 degrees.

5. Sealing ring, also known as leak reducing ring.

6. The packing box mainly consists of packing, water seal ring, packing cylinder, packing gland, and water seal pipe. The main function of the packing box is to seal the gap between the pump casing and the pump shaft, preventing the water flow inside the pump from flowing outside and preventing external air from entering the pump. Always maintain a vacuum inside the water pump! When the friction between the pump shaft and the packing generates heat, the water seal pipe needs to hold the water inside the water seal ring to cool the packing! Maintain the normal operation of the water pump. So during the operation inspection of the water pump, special attention should be paid to the inspection of the packing box! The packing needs to be replaced after about 600 hours of operation.