1. Mechanical loss :
Friction loss in the outer surface of the front and back cover of the liquid and the impeller and the friction loss of the pump cavity (also called disc loss).
The proportion of disc loss is larger, and even 30% of the effective power is achieved. Test results show that the disc loss and speed of the three square is proportional to, and the impeller diameter of the five square is proportional to. Therefore, the greater the diameter of the impeller, the greater the loss of the disc. Although the three party disk loss and speed is proportional to, but in a given lift, along with speed increasing, the impeller diameter reduced accordingly (can be considered to improve pump speed is doubled, the outer diameter of the impeller is reduced by half), five party disk loss ratio decreased, so, with the increase of rotational speed, the disk is not loss increased, decreased, which is one of the reasons for the development of high speed pump.
2.Volume loss :
Impeller part of the liquid through the impeller sealing ring clearance leakage back to the impeller can not be effectively used to form a loss. Therefore, the clearance of the sealing ring should be as small as possible, but due to the processing and assembly and other reasons, too small clearance may cause partial grinding or die, the national standard for various types of pump clearance made a special provision.
3.Hydraulic loss :
The flow of the pump part (from the inlet to the outlet) of the fluid must have a change in the size and direction of the loss caused by loss, which is the two part of the hydraulic loss. To reduce the loss of this part, in addition to improving the flow components of finish givers, try to use the advanced hydraulic model.
