The impeller is the core part of the water 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 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. The impeller of the pipeline centrifugal pump is directly installed on the long shaft of the motor. The axial size is short, the structure is compact, and the pump and the motor bearing are arranged reasonably, which can effectively balance the radial and axial loads generated by the pump operation, thereby ensuring the smooth operation of the pump , Small vibration and low noise.
When repairing various types of water pumps with impellers, it is often encountered that the pump impeller is damaged by wear or corrosion, so it will involve the need to disassemble the pump impeller, the method of disassembling the pump impeller, and the precautions for disassembling the pump impeller. details as follows:
1. When disassembling the impeller of the water pump, it is necessary to measure the axial and radial runout of the rotor, measure whether the axial runout and radial runout of the rotor are normal, and record it as shown in Figure 1-11. The maximum value minus the minimum value is the amount of runout at that point
2.Then disassemble the impeller back cap, remove the impeller, confirm the rotation direction of the back cap before disassembly, and prohibit the reverse force to damage the back cap, as shown in Figure 1-12. In order to avoid cracking the impeller, as shown in Figure 1-13, there should be no seizure and slippage phenomenon on the impeller back cap after visual inspection, otherwise it should be repaired or replaced.
3.Remove the impeller guide flat key. The appearance inspection of the flat key should have no obvious deformation, defects, etc., and the keyway should meet the requirements. Otherwise, the water pump using the impeller should be repaired or replaced. Usually, there are multi-stage centrifugal pumps and sewage sewage pumps. Or submersible pump products.
