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The Powerex Scroll Base Mounted Compressor System is based on the theory of scroll compression. A scroll is a free standing, intricate spiral bounded on one side by a solid, flat plane or base. A scroll set, the basic compression element of a scroll compressor, is made up of two identical spirals that form right and left hand parts. One of these scroll components is indexed or phased 180° with respect to the other so the scrolls can mesh. Crescent-shaped gas pockets are formed and bounded by the spirals and the base plate of both scrolls. As the moving scroll is orbited around the fixed scroll, the pockets formed by the meshed scrolls follow the spiral toward the center and diminish in size. The moving scroll is prevented from rotating during this process so the 180° phase relationship of the scrolls is maintained. The compressor’s inlet is at the outer boundary of the scrolls. The compressed gas is discharged through the outlet at the center of the fixed scroll so no valves are needed.
The tip seal on the scroll compressor is self-lubricated and allows the unit to operate efficiently without oil. On standard pressure units, the tip seal should be replaced every 10,000 hours of operation. On high pressure units, the tip seal should be replaced every 5,000 hours. The system's rotary design permits a continuous 100% duty cycle. No oil separation, oil filtration, or inlet valves are required on the scroll unit.
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