What does the nominal diameter of impeller mean?
The impeller is usually of a short cylindrical shape and has an open inlet that allows the fluid to flow in and the fluid then flows out of the fluid and pushes the fluid along the radial direction. The center of the impeller is provided with a keyway or threaded hole so as to be connected with the drive shaft.
The nominal diameter of the hydraulic mechanical impeller, such as the diameter of the impeller of the axial flow pump, is the diameter of the runner, and the centrifugal pump is the largest diameter at the outlet of the blade, and the diameter of the impeller of the Francis turbine is the largest diameter at the inlet
Impeller is a rotating device used to increase (or decrease) fluid pressure and speed. The impeller can transfer the energy of the motor into the fluid so that the fluid accelerates away from the center of rotation.
[nominal diameter of impeller] nominal diameter is used in hydraulic calculations and obtained after rounding. They are generally integers, so to speak, they are serialized. In brief, the impeller diameter can be measured, but the nominal diameter is less than the measured impeller diameter.
