Impellers are key components in rotating machinery such as pumps, fans, turbines, etc., and what are their main functions

In the pump: the impeller is the component that transfers the mechanical energy of the prime mover to the liquid.

Impeller is a key component in rotating machinery such as pumps, fans, turbines, etc. Its main functions are as follows:
In the pump: the impeller is the component that transfers the mechanical energy of the prime mover to the liquid. When the impeller rotates at a high speed in the pump casing, the blades will drive the liquid to rotate together, so that the liquid gets centrifugal force. Under the action of centrifugal force, the liquid is thrown from the center of the impeller to the outer edge of the impeller, and the flow rate and pressure are increased, so as to realize the transmission and pressurization of the liquid. For example, the water supply and drainage system in industrial production, fluid transportation in the petrochemical industry, etc., all rely on the impeller of the pump to realize the efficient transmission of liquid.
In fans: the rotation of the impeller pushes the air to flow. The blades do work on the air, so that the air obtains kinetic energy and pressure energy, thus realizing the transportation and pressurization of air. Fans are widely used in ventilation, air conditioning, mine ventilation, boiler induced air, etc. The impeller provides the required air flow and pressure for these systems by continuously rotating.
In a turbine: a high-temperature, high-pressure gas or liquid impinges on the blades of the impeller, causing the impeller to rotate. The impeller converts some of the fluid's energy into mechanical energy, which drives other equipment such as generators and compressors. For example, in a thermal power station, the impeller of a steam turbine rotates under the action of high-temperature and high-pressure steam, driving a generator to generate electricity; in a hydroelectric power station, the impeller of a hydraulic turbine rotates under the impact of water flow, converting water energy into mechanical energy, which is then converted into electrical energy.