What are the two main categories of air compressors?

The main categories of air compressors are classified as dynamic and positive displacement.

Dynamic compressors operate by imparting velocity to the air and then converting that velocity into pressure. They typically use rotating blades or impellers to achieve this, making them suitable for high-flow applications where continuous air supply is needed. Examples of dynamic compressors include centrifugal and axial types.

Positive displacement compressors, on the other hand, work by trapping a volume of air and then reducing that volume to increase its pressure. This category includes reciprocating and rotary screw compressors, which are commonly used for applications requiring high pressure and relatively low flow rates.

Understanding these two primary categories helps in selecting the right type of compressor for specific applications based on factors such as required pressure, flow rate, and the nature of the work environment.