What is the primary function of the impeller in a pump?

The primary function of the impeller in a pump is to convert rotational energy into fluid motion. When the impeller spins, it imparts kinetic energy to the fluid, causing it to move through the pump and into the discharge line. This process is essential for the functioning of centrifugal pumps, which rely on the rotational motion of the impeller to achieve fluid flow. By accelerating the fluid, the impeller enables the system to effectively transport liquids at various pressures and flow rates.

Other functions mentioned, like absorbing energy, creating a vacuum, or increasing temperature, do not align with the core role of the impeller. The impeller specifically enhances the movement of the fluid rather than directly absorbing energy from it, creating a vacuum, or impacting temperature. Its design and operation are central to achieving the desired pumping action and ensuring efficient performance in fluid transfer applications.