1. Leakage loss of the sealing ring When the quality rubber impeller is working, because there is a pressure difference on both sides of the sealing ring, there will always be a part of the liquid leaking from the outlet of the quality rubber impeller to the impeller mouth. The energy of the leaking liquid is all used to overcome the resistance of the sealing ring.

2. Leakage loss of balance structure In many vertical multi-layer quality rubber impellers, there are structures to balance axial thrust, such as balance holes, balance tubes, balance discs, etc. Moreover, the Shanghai Naiang quality rubber impeller found that due to the pressure difference on both sides of the balance structure, a part of the liquid leaked from the area to the low pressure area.

3. Leakage loss between stages In the volute type multi-layer quality rubber impeller, the pressure on both sides of the stage partition plate is not equal, so there is also leakage loss.

4. Quality rubber impeller loss The quality rubber impeller loss includes the friction loss between the quality rubber impeller shaft and the bearing and the sealing device, and the friction loss between the outer surface of the front and rear cover plates of the quality rubber impeller and the liquid, and the quality rubber impeller loss has nothing to do with the flow rate.