[Scroll Compressor]Advantages and Disadvantages of Scroll Compressor

Scroll Compressor: Advantages and Disadvantages

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A scroll compressor operates with a stationary scroll and a moving scroll that performs eccentric orbital movements to form compressible volumes. This compressor works through the engagement of the stationary and moving scrolls, each designed with complex, double-function lines, creating a closed chamber for compressing gas.

Working Process of the Scroll Compressor

During the cycles of suction, compression, and exhaust, the stationary scroll (or disc) remains fixed on the frame. The moving scroll is driven by an eccentric shaft and controlled by an anti-rotation mechanism. This setup allows the moving scroll to rotate in a small-radius orbit around the center of the stationary scroll. As the gas is drawn in through an air filter at the periphery of the stationary scroll, the eccentric shaft’s rotation compresses the gas in crescent-shaped chambers formed between the moving and stationary scrolls. The compressed gas is then discharged through an axial hole at the center of the stationary scroll.

Advantages of Scroll Compressors

1. Simple Structure: With no reciprocating mechanisms, scroll compressors have a simpler design, making them compact, lightweight, and more reliable due to fewer parts, especially fewer wearing parts.
2. Smooth Operation: The compressor’s high balance and small torque variations reduce vibration, ensuring smooth and stable operation, which also facilitates automation.
3. High Efficiency: Scroll compressors are highly efficient within their ideal cooling capacity range.
4. Low Noise: The compressor operates quietly, making it suitable for noise-sensitive environments.

Disadvantages of Scroll Compressors

1. Complex Manufacturing: The curved surfaces of moving parts require specialized processing and inspection, which raises manufacturing costs.
2. Potential Leakage: To maintain a seal, a precise gap is maintained between moving and fixed parts. Gas leakage through this gap can reduce efficiency, limiting scroll compressors’ application primarily to air-conditioning systems.
3. High Sealing Requirements: The complex sealing structure required to maintain compression adds to manufacturing difficulty and maintenance needs.

Working Principle of the Scroll Compressor

In the scroll compressor’s suction, compression, and exhaust phases, the stationary scroll remains affixed to the frame while the moving scroll, driven by an eccentric shaft and controlled by an anti-rotation mechanism, orbits with a small radius around the center of the stationary scroll. As the gas enters through the air filter element, it is compressed in crescent-shaped chambers formed between the two scrolls, then continuously discharged through an outlet at the center of the stationary scroll.