Which part of a pump is commonly referred to as the eye?

The part of a pump referred to as the "eye" is the impeller. The eye is the central inlet area of the impeller where the fluid first enters as it is being drawn into the pump. The design of the impeller is crucial because it is responsible for converting the mechanical energy from the motor into kinetic energy, which moves the fluid efficiently. The shape and size of the eye impact the flow rate and performance of the pump, making it a critical component in pump design and operation.

In understanding the roles of the other components, the shaft is the part that transfers power from the motor to the impeller, while the casing encases the impeller and helps direct the flow of the fluid. The packing gland serves to contain the fluid and prevent leaks, but it does not play a direct role in the initial fluid intake, which is the function of the eye of the impeller. Thus, recognizing the significance of the eye within the impeller is essential for understanding pump mechanics and operation.