What category does an air compressor belong to?

Basic Definition and Core Functions of Air Compressors

An air compressor, formally known as an air compression machine, is a device that converts the mechanical energy of a prime mover into the pressure energy of a gas. Its primary function is to compress air or other gases, thereby increasing their pressure and enabling their transport. Due to its wide range of applications, air compressors play an indispensable role in modern industrial production, serving as a fundamental power source in numerous manufacturing and processing operations.

Category classification in national economic and industrial standards

In the national standards and industrial classification system, the categorization of air compressors is very clear:

• General-purpose machinery and equipmentIn the classification of the machinery industry, air compressors fall under the “Pumps, Valves, Compressors, and Similar Machinery” sub‑category within the broader “General Machinery” category.
• Fluid machineryFrom the perspective of operating principles and disciplinary classification, air compressors are classified as gas compression and delivery equipment within the field of fluid machinery.
• Special equipment (in certain cases)When an air compressor is integrated as a complete set with pressure vessels such as air receivers, and the relevant parameters meet specific standards, the associated pressure vessel components must be brought under the regulatory oversight of special equipment.

Categories in e-commerce platforms and procurement catalogs

On B2B e‑commerce platforms, in industrial‑goods procurement catalogs, and within enterprise asset classifications, air compressors are typically categorized at the following levels:

• Primary Category: Mechanical equipment, industrial products, or hardware and electrical machinery.
• Secondary Category: General machinery, power equipment, or pneumatic tools and accessories.
• Third-level classification: Compressor, air compressor, or air supply equipment.

This classification scheme is primarily designed to enable industrial procurement personnel to quickly search for and compare equipment of different specifications.

Major subcategories of air compressors

Based on their operating principles and structural characteristics, air compressors can be further subdivided into several subcategories, with the most common including:

• Positive-displacement compressor: Increasing pressure by reducing the volume of a gas, as in piston-type air compressors, screw-type air compressors, and vane-type air compressors.
• Dynamic compressor: Kinetic energy is converted into pressure energy by a high-speed rotating impeller, as in centrifugal and axial-flow compressors.

Understanding these sub‑categories helps companies select the most suitable equipment type during procurement, based on gas consumption, pressure requirements, and energy‑efficiency criteria.