What is the function of the impeller on the balance hole?
Due to the leakage of the steam seal of the partition plate, the impeller will still produce a certain pressure difference between the front and rear of the impeller, resulting in an increase of axial thrust. After the impeller is balanced, it can reduce the axial thrust.
The balance hole can balance the axial force generated by the rotation of the impeller, but the balance hole needs to be used together with the back ring of the impeller, otherwise there is no balance
Impeller opening less, mostly in the rotating shaft with a balance block, the purpose is to keep the rotation balance, reduce vibration.
