Structure composition of centrifugal pump

The basic structure of a centrifugal pump is composed of six parts: impeller, pump body, pump shaft, bearing, sealing ring, and stuffing box.

1. The impeller is the core part of the centrifugal pump. It has a high speed and a large output. The blades on the impeller play a major role. The impeller must pass a static balance test before assembly. The inner and outer surfaces on the impeller are required to be smooth to reduce the frictional loss of the water flow.

2. The pump body is also called the pump casing, which is the main body of the pump. It plays the role of supporting and fixing, and is connected with the bracket on which the bearing is installed.

3. The function of the pump shaft is to connect the motor with the coupling and transmit 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 lubricant, add oil to the oil level line. Too much oil will seep along the pump shaft, and too few bearings will overheat and burn out, causing an accident! During the operation of the water pump, the maximum temperature of the bearing is 85 degrees, and it generally runs at about 60 degrees.

5. The sealing ring is also called the leakage reducing ring.

6. The stuffing box is mainly composed of stuffing, water seal ring, stuffing cylinder, stuffing gland and water seal tube. The function of the stuffing box is mainly to close the gap between the pump casing and the pump shaft, prevent the water flow in the pump from flowing to the outside, and let the outside air enter the pump, and always maintain the vacuum in the pump. When the friction between the pump shaft and the packing generates heat, the water seal pipe is used to inject water into the water seal ring to cool the packing and maintain the normal operation of the pump. Therefore, special attention should be paid to the inspection of the stuffing box during the patrol inspection of the pump, and the stuffing should be replaced after about 600 hours of operation.