When the liquid was shaken to the impeller exit, the impeller inlet center to form a low pressure in the suction tank and the impeller at the center of the liquid produced a pressure difference between the suction tank in the liquid under the effect of this pressure, The ground through the suction pipe and pump suction chamber into the impeller. Lanshen pump repair pump the most important attention to detail, whether it is centrifugal pumps or other forms of pumps are the same, I remember once a maintenance of the pump for many years a master because the pump body a small screw did not make the final result Pump failure is completely damaged.
The midline of the impeller exit center line, or the impeller exit width, in the volute pump should be aligned with the volute inlet centerline. So that the impeller in the rotation process, while constantly inhalation of liquid, while constantly to the inhalation of liquid with a certain amount of energy to the liquid discharge, so that centrifugal pump to work continuously. If the missing, it should be in the impeller wheel shaft and shoulder pad by adding additional adjustment. The two center lines should be controlled within the range of 0.5 mm. For a pump with a slightly lesser number of rotations, the effect on the performance of the pump is not significant. For pumps with medium to low specific speed, because the impeller exit is very narrow, for example, the impeller outlet is only 10 mm wide. If the volumetric center line is 1 mm, Of the performance there is a clear impact. It is recommended to adjust the error of the two midline (impeller and volute) within 5% of the impeller exit width.
The same is true for multi-stage pump, is to control the impeller exit center line and guide vane import center line error. Spatial guide vane pump, preferably with the data given in the assembly diagram to determine the position of the impeller in the space guide vanes. If there is no drawing, or empirically, or through the test results to adjust the position of the impeller.