Page 5
The scroll is a simple compression concept centered around
the unique spiral shape of the scroll and its inherent properties.
Figure 5 shows the basic scroll form. Two identical scrolls are
mated together forming concentric spiral shapes (figure 6). One
scroll remains stationary, while the other is allowed to "orbit" (fig-
ure 7). Note that the orbiting scroll does not rotate or turn but
merely orbits the stationary scroll.
NOTE − During operation, the head of a scroll compressor may
be hot since it is in constant contact with discharge gas.
FIGURE 5
SCROLL FORM
FIGURE 6
STATIONARY SCROLL
ORBITING SCROLL
DISCHARGE
SUCTION
CROSS−SECTION OF SCROLLS
TIPS SEALED BY
DISCHARGE PRESSURE
DISCHARGE
PRESSURE
1
2
3
4
SUCTION
POCKET
SUCTION
ORBITING SCROLL
STATIONARY SCROLL
SUCTION
SUCTION
DISCHARGE
POCKET
SUCTION
INTERMEDIATE PRESSURE
GAS
CRESCENT
SHAPED
GAS POCKET
HIGH PRESSURE GAS
FLANKS SEALED
BY CENTRIFUGAL
FORCE
MOVEMENT OF ORBIT
FIGURE 7
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