Scroll Compressor

Scroll Compressor Points : scroll compressor, definition, working of scroll compressor Scroll compressor consists of two identical spiral scroll mated face to face. Each scroll is bound on one side to a flat plate. The upper scroll is stationary & contains the discharge port. The lower one moves in an orbit around the shaft center of the motor at an amplitude equal to the orbit radius. The two scrolls are fitted together to for vapor pockets b/w their respective base plates & lines of contacts of their Vane walls. During suction, vapor refrigerant enters the space b/w the two scrolls through the lateral openings. The openings are then sealed off to form trapped vapor pockets, thus completing The intake process.

During the successive revolutions of the motor shaft, the volume of the trapped vapor pockets is reduced, & the compression process is complete when the gaseous refrigerant is compressed to its maximum pressure & just before the compressed gaseous pocket is opened to the discharge port. During discharge, the trapped gas pockets open to the discharge port. All compressed hot gas is discharged through the discharge port to the discharge line. The volume of the gas pockets is reduced the zero. The sequence, of intake, compression & discharge occurs simultaneously in the two trapped gas pockets.

The water absorbent returns to the absorber and the pressurized ammonia vapor flow to the condenser. As heat is removed for the ammonia vapor due to the air blowing across the condenser coil, the vapor is cooled & returns to a liquid form while still under pressure. The liquid ammonia then flow through a metering device & flashed into the low pressure chamber. The ammonia refrigerant is again a vapor & the cycle beings again.