MovinCool 24HFU Service Manual - Manual (Page 8)

MOVINCOOL 24HFU / 24HFU-1 SERVICE PAGE 8
REFRIGERANT SYSTEM
3-1. Compressor
The compressor used for the unit is hermetically sealed. The compressor and the compressor motor are in
one casing.
3-1-2. 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 increas-
ingly smaller pockets.
3-1-1. 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.