Gap Adjustment for Maintenance of Water Pump Stator Components

For the maintenance of water pump stator components, it is necessary to check the radial clearance of each middle section first, and analyze the data to see if it is adjusted. The maintenance personnel first check the size of the middle seam, and analyze whether it is within the normal range. Generally, the normal range is 0.04 mm~0.06 mm. If it exceeds 0.1 mm, it means that there is a problem with the part and should be solved in time. The middle seam plays an important role in the use of the water pump, and its normal operation directly affects the working efficiency of the water pump.

The second is the maintenance of guide vane and pump casing. According to the manufacturing characteristics of the water pump, the guide vane is manufactured by QT technology and then put into use. If the guide vanes are severely scoured in pump applications, the guide vanes should be replaced in time to avoid adverse effects. It should be noted that the newly replaced guide vanes need to be polished and cleaned before installation to ensure their own smoothness and play their own role. Maintenance personnel should pay attention to the gap between the guide vane and the pump casing. If it is 0.04 mm~0.06 mm, it means that this part is operating normally and there is no problem. The guide vane and the pump casing must be compressed to reduce the occurrence of wear. Operations such as backside processing along the circumference, away from the edge position, etc., can achieve their purpose.

Finally, it is the adjustment of the gap between the water pump seal ring and the guide vane sleeve. These parts also affect each other. Install the sealing ring on the pump casing and install the guide vane on the guide vane. It is necessary to pay attention to the materials used to comply with the regulations of the water pump. The hardness requirements of these parts are relatively high, and they will generate greater friction with the impeller during use. If the front and rear navels of the impeller are found to be damaged, it means that the parts have been severely worn. Therefore, it is necessary to adopt different maintenance schemes according to the specific conditions of wear. For example, the MAX clearance after wear should be within the control range, ensure that there is enough space between the guide vane sleeve and the impeller, and skillfully apply the fastening screws and stop screws. .

 

Gap Adjustment for Maintenance of Water Pump Rotor Components

1. The bending of the water pump

During the operation of water pump equipment, the rotor speed is relatively high, resulting in a large load on the central shaft body. Therefore, in order to ensure the overall quality of the components, the shape of the shaft must be strictly required. If the bending is too large, as if it has exceeded the specified 0.02 mm, it needs to be straightened in time. This kind of bending will cause the water pump rotor to jump, and the greater the curvature, the greater the beating range, which will eventually affect the gap between the sealing ring and the guide vane sleeve. If this kind of problem is not dealt with in time, the gap will be enlarged, and even when the pump is in use, obvious vortices will appear, causing vibration.

2. Assembly gap between impeller and pump shaft

In the application process of multi-stage pumps, the impeller and the pump shaft are assembled through a clearance fit in this equipment application, and the range needs to be controlled within 0.04 mm. If the gap is too large or too small, it will increase the difficulty of assembly: if the gap is too large, it will increase the beating range of the pump rotor; if it is too small, it will increase the friction. The increased gap caused by the use of equipment can be repaired by spraying repair method, mainly for the shaft section and the inner hole of the impeller.

3. Small rotor assembly

① Inspection and maintenance personnel before small assembly should check the size of each component of the rotor, which can eliminate the difference in time and effectively control the value of the gap. Under normal circumstances, the runout of each part on the shaft will not exceed 0.03 mm, so all parts on the shaft should be checked for the verticality of the center line to ensure that there is a sufficient distance between the mandrel shaft and each packaged part. within the controllable range. The maintenance personnel turn the set piece by hand, and after one turn, it will show less than 0.015 mm on the dial indicator. To perform a squareness check in the same way, place the kit on a flat plate and measure it. However, it should be noted that this measurement method cannot obtain the vertical error between the flat surface layer and the shaft centerline, but the parallel error between the upper and lower end surfaces, so as to avoid misjudgment.

②Rotor maintenance For the maintenance of rotor parts, it can be realized through small rotor assembly, which is also the main content that affects the assembly quality. This operation is to eliminate the unbalanced moment and couple moment in the rotation of the rotor, thereby reducing the wear caused by the inside of the rotor. Maintenance personnel need to adjust the axial distance between the impellers, align them with the center line of the impellers, and adjust the size accurately. The axial expansion gap of some rotor sleeve components also needs to be paid attention to all the time, which causes the difference of materials. In the thermal state, the expansion data of different components are inconsistent. In general, the expansion degree of the rotor sleeve is greater than that of the pump shaft, so during the installation process, a sufficient expansion gap should be reserved for the rotor sleeve. The expansion gap should also be controlled. If the expansion gap is too large, the rotor sleeve parts cannot be fastened, and if the gap is too small, thermal bending of the rotor may occur, further damaging the equipment.

In addition to the above 2 points, the rotor runout, impeller pitch and rotor string dynamic balance should also be measured, and reasonable adjustments should be made. In the rotor runout measurement, it is necessary to clean the kit, and then install it on the shaft in a certain order, from the low pressure side to the high pressure side, and tighten the nut of the kit for measurement. In the measurement of the impeller pitch, the axial clearance of the impeller pitch of each stage should be measured, and the deviation should be controlled to be less than 0.5 mm. For the dynamic balance of the rotor series, it is necessary to mark the position of the components. After the measurement, they are also disassembled in sequence.