What defines a scroll compressor's structure?

• A. It has rotating blades and a cylinder
• B. It consists of one fixed and one oscillating scroll
• C. It uses multiple pistons for compression
• D. It operates solely with liquid refrigerant

Answer: (B)

A scroll compressor is defined by its structure that includes one fixed scroll and one oscillating scroll. This design allows for the continuous compression of refrigerant gas in a highly efficient manner. The fixed scroll remains stationary, while the oscillating scroll moves in a circular motion, creating pockets of varying volume between the two scrolls. As the oscillating scroll moves, it traps and compresses the refrigerant gas, pushing it towards the discharge port without the use of valves, which aids in increasing the efficiency of the compression process.

This unique configuration of a fixed and an oscillating scroll is what distinguishes scroll compressors from other types of compressors, such as those that employ rotating blades, cylinders, or multiple pistons. In other systems, depending on a different compression mechanism, they may not attain the same level of efficiency and noise reduction that a scroll compressor provides. The design also leads to fewer moving parts, which generally results in less wear and tear and longer lifespans for these compressors.