KIRLOSKAR CHILLERS PRIVATE LIMITED
A Kirloskar Group Company IOM-KAC-ENG - Page 19
3.3.1. Hermetic Type Scroll Compressor
In a Performer scroll compressor, the compression is performed by two scroll elements located in
the upper part of the compressor.
Suction gas enters the compressor at the suction connection. As all of the gas flows around and
through the electrical motor, thus ensuring complete motor cooling in all applications, oil
droplets separate and fall into the oil sump. After exiting the electrical motor, the gas enters the
scroll elements where compression takes place. Ultimately, the discharge gas leaves the
compressor at the discharge connection.
The figure below illustrates the entire compression process. The center of the orbiting scroll (in
grey) traces a circular path around the center of the fixed scroll (in black). This movement
creates symmetrical compression pockets between the two scroll elements. Low-pressure suction
gas is trapped within each crescent-shaped pocket as it gets formed; continuous motion of the
orbiting scroll serves to seal the pocket, which decreases in volume as the pocket moves towards
the center of the scroll set increasing the gas pressure. Maximum compression is achieved once a
pocket reaches the center where the discharge port is located; this stage occurs after three
complete orbits. Compression is a continuous process: the scroll movement is suction,
compression and discharge all at the same time.
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