Is a scroll compressor the same as a turbo compressor?

Core conclusion: The two are not the same concept.

In the field of compressor technology,Scroll compressorwithTurbocompressorAlthough their names are similar, they differ fundamentally in their core operating principles, mechanical structures, and application scenarios. The two must not be confused under any circumstances.

Working Principle and Characteristics of the Scroll Compressor

The scroll compressor belongs toPositive displacement compressorIts core components are two spirally‑shaped scrolls that are identical in geometry but offset by 180 degrees from one another. One scroll is fixed in place, while the other performs an orbital‑rotational motion around it. During this orbit, multiple crescent‑shaped sealed volumes are formed between the two scrolls. As the moving scroll orbits, these sealed volumes progressively migrate toward the center and decrease in size, thereby achieving continuous gas compression.

Its main features include:

• It runs smoothly, with extremely low noise and vibration.
• It has no suction and discharge valves, resulting in high volumetric efficiency.
• Compact structure, few components, and high reliability.

Working Principle and Characteristics of Turbo Compressors

A turbo compressor (typically a centrifugal compressor or a high-speed turbocompressor) belongs toVelocity-type compressorIt relies on a high-speed rotating impeller to do work on the gas, imparting extremely high kinetic energy; the gas is then decelerated in the diffuser, where the kinetic energy is converted into pressure energy, thereby achieving gas compression.

Its main features include:

• Large displacement, suitable for handling high-flow gases.
• It operates at extremely high rotational speeds and typically requires a sophisticated speed-increasing gearbox or a magnetic‑levitation bearing system.
• The airflow is continuous, with no pulsation.

Comparison of the Core Technologies of the Two

To better understand the differences between the two, a technical comparison can be conducted across the following dimensions:

• Compressor mechanism type: A scroll compressor is a positive‑displacement type that increases pressure by reducing the working volume; a centrifugal compressor is a dynamic‑type machine that converts kinetic energy into pressure energy.
• Applicable flow rate and pressure ratioScroll compressors are suitable for medium- and small‑capacity applications with relatively high pressure ratios; centrifugal compressors are ideal for large‑capacity operations, offering a lower pressure ratio per stage, though multistage series connections can increase the overall pressure ratio.
• Application fieldsScroll compressors are widely used in small and medium-sized refrigeration equipment, including residential and commercial air conditioners, heat pump water heaters, and automotive air conditioning systems; centrifugal compressors, on the other hand, are predominantly employed in large‑scale central air‑conditioning chillers, process gas compression in the petrochemical industry, and large industrial refrigeration systems.

Selection Recommendations

In practical engineering applications, the choice of compressor depends on the specific operating conditions. For medium- and small‑capacity cooling applications with stringent requirements for noise levels and energy efficiency, scroll compressors are the ideal solution; whereas for industrial or large‑scale commercial applications involving high cooling capacities and substantial refrigerant flow rates, centrifugal compressors offer distinct advantages. Clearly defining the technical boundaries between these two types helps ensure more rational equipment selection.