Why are there any balancing holes on the impeller of the centrifugal pump, while others do not?
When the pump work, back cover and the pump cover filled from the outlet of impeller into the medium, the pressure is approximately equal to the impeller outlet pressure, through a balance hole is that uniform holes,
The back pressure is equal to the inlet pressure, so as to achieve the function of balancing the axial force. As for what the axial force and its production, you can search on the Internet, there are many explanations.
These holes are evenly distributed on the impeller hub generally has several roots, leaves several holes, the impeller inlet and the rear cover Unicom space after
