There are three types of power loss in a centrifugal pump: hydraulic loss, volume loss, mechanical loss
1) hydraulic loss
When the fluid flows in the pump body if the flow path is smooth, the resistance will be smaller, and if the flow path is rough, the resistance will be greater. The above two losses are called hydraulic losses.
2) Volume loss
The impeller is rotating, and the pump body is stationary. A small part of the fluid in the gap between the impeller and the pump body returns to the inlet of the impeller; in addition, a part of the fluid flows back from the balance hole to the inlet of the impeller, or leaks from the shaft seal. damage. If it is a multi-stage pump, part of it will also leak from the balance plate. These losses are called volume losses;
3) Mechanical loss
When the shaft rotates, it will rub against bearings, fillers, etc. The impeller rotates in the pump body, and the front and rear cover plates of the impeller will rub against the fluid, which will consume part of the power. These losses caused by mechanical friction will always become mechanical losses.