The centrifugal pump works by rotating the impeller to cause the water to undergo centrifugal motion. Before the pump is started, the pump casing and the suction pipe must be filled with water, and then the motor is started, so that the pump shaft drives the impeller and water to perform high-speed rotation movement, the water is centrifugally moved, and is raked to the outer edge of the impeller, and flows through the volute pump casing. The road flows into the pressurized water line of the pump.
The basic structure of the 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. Its high speed is high, and the blades on the impeller play a major role. The impeller must pass the static balance test before assembly. The inner and outer surfaces of the impeller are required to be smooth to reduce the frictional loss of water flow.
2. The pump body is also called the pump casing, it is the main body of the pump. It acts as a support and is attached to the bracket on which the bearing is mounted.
3. The function of the pump shaft is to connect the coupling to the motor and transmit the torque of the motor to the impeller, so it is the main component that transmits mechanical energy.
4. The sliding bearing uses a transparent oil as a lubricant, refueling to the oil line. Too much oil will ooze along the pump shaft, too few bearings will overheat and burn out, causing accidents! During the operation of the pump, the temperature of the bearing is at most 85 degrees, and generally runs at about 60 degrees.
5. The seal ring is also known as the leak reduction ring.
6. The stuffing box is mainly composed of packing, water sealing ring, packing tube, packing gland and water sealing tube. The function of the stuffing box is mainly to close the gap between the pump casing and the pump shaft, so that the water in the pump does not flow to the outside and the outside air does not enter the pump. Always keep the vacuum inside the pump! When the pump shaft and the packing friction generate heat, the water should be sealed to the water seal ring to cool the packing! Keep the pump running normally. Therefore, the inspection of the stuffing box during the running inspection of the pump is particularly important. The packing should be replaced after about 600 hours of operation.
