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TRG-TRC004-EN 9
period one
Compressor Types
notes
During the first full revolution of the shaft, or the intake phase, the edges of
the scrolls separate, allowing the refrigerant vapor to enter the space between
the two scrolls. By the completion of first revolution, the edges of the scrolls
meet again, forming two closed pockets of refrigerant.
During the second full revolution, or the compression phase, the volume of
each pocket is progressively reduced, increasing the pressure of the trapped
refrigerant vapor. Completion of the second revolution produces near-
maximum compression.
During the third full revolution, or the discharge phase, the interior edges of
the scrolls separate, releasing the compressed refrigerant through the
discharge port. At the completion of the revolution, the volume of each pocket
is reduced to zero, forcing the remaining refrigerant vapor out of the scrolls.
Looking at the complete cycle, notice that these three phases—intake,
compression, and discharge—occur simultaneously in an ongoing sequence.
While one pair of these pockets is being formed, another pair is being
compressed and a third pair is being discharged.
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Figure 13