Basic structure of centrifugal pump
Time：2017/2/16 Source：Pearl Pump Industry Views：
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 large output. The blades on the impeller play a major role. The impeller must pass a static balance experiment before assembly. The inner and outer surfaces of the impeller are required to be smooth to reduce the friction loss of the water flow.
2. The pump body is also called the pump housing, which is the main body of the water pump. Play a supporting and fixing role, and connect with the bracket for mounting the bearing.
3. The role of the pump shaft is to connect with the motor by means of a coupling, and transmit the torque of the motor to the impeller, so it is the main component that transmits mechanical energy.
4. The bearing is a component that is sleeved on the pump shaft to support the pump shaft. There are two types of rolling bearings and sliding bearings. Rolling bearings use tallow as a lubricant to refuel properly. Generally, 2/3～3/4 of the volume will be too much to generate heat, too little and there will be noise and heat! The sliding bearing centrifugal pump structure uses transparent oil as a lubricant, and the oil is added to the oil level line. Too much oil will seep and drift along the pump shaft, and too little bearing will overheat and burn out, causing accidents! During the operation of the pump, the bearing temperature is as high as 85 degrees and generally runs at about 60 degrees. If it is high, find out the cause (whether there are impurities, whether the oil is black, whether water has entered) and deal with it in time!
5. The sealing ring is also called the leakage reducing ring. The gap between the impeller inlet and the pump casing is too large to cause the water in the high-pressure area of ??the pump to flow to the low-pressure area through this gap, which will affect the water output of the pump and reduce the efficiency! If the clearance is too small, friction between the impeller and the pump casing will cause abrasion. In order to increase the return resistance, reduce internal leakage, and delay the service life of the impeller and the pump casing, a sealing ring is installed at the junction of the inner edge of the pump casing and the external aid of the impeller, and the sealing gap should be kept between 0.25 and 1.10mm.
6. ??The stuffing box is mainly composed of packing, water seal ring, packing tube, packing gland, and water seal pipe. 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 maintain the vacuum in the pump! When the pump shaft and the packing generate heat due to friction, the water seal pipes the water into the water seal ring to cool the packing! Maintain the normal operation of the pump. Therefore, special attention should be paid to the inspection of the stuffing box during the itinerant inspection of the pump operation! The packing should be replaced after 600 hours of operation.
