DENSO CORPORATION CLASSIC PLUS 26 - Manual (Page 18)

REFRIGERANT SYSTEM
10
1. Compressor
The compressor used for the unit is hermetically sealed. The compressor and the compressor motor are in
one casing.
B. Compressor Operation
1) Compression in the scroll is created by
the interaction of an orbiting spiral and a
stationary spiral. Gas enters the outer
openings as one of the spirals orbits.
2) The open passages are sealed off as gas
is drawn into the spiral.
3) As the spiral continues to orbit, the gas is
compressed into two increasingly smaller
pockets.
A. Compressor Theory of Operation
The scroll utilizes an involute spiral which, when matched with a mating scroll form, generates a series of
crescent-shaped gas pockets between the two members. During compression, one scroll remains
stationary (fixed scroll) while the other form (orbiting scroll) is allowed to orbit (but not rotate) around the
first form. As this motion occurs, the pockets between the two forms are slowly pushed to the center of
the two scrolls while simultaneously being reduced in volume. When the pocket reaches the center of
the scroll form, the gas, which is now at a high pressure, is discharged out of a port located at the
center. During compression, several pockets are being compressed simultaneously, resulting in a very
smooth process. Both the suction process (outer portion of the scroll members) and the discharge
process (inner portion) are continuous.