Scroll pumps are one of the few that have historically been used in low and medium vacuum systems but are now widely used as fore pumps in high and ultra-high vacuum systems, holding an advantageous position in the world of vacuum systems. They must be made aware of their intolerance for particles and the possibility of particle formation owing to tip seal deterioration.
Operating procedures for scroll pumps
● Two co-wound spiral-shaped scrolls housed in a vacuum housing, with an exit valve in the middle, make up the essential functioning components of a scroll pump.
● One spiral is fixed, and the other, known as the "orbiter," moves eccentrically in opposition to it without revolving.
●As one of the spirals orbits, gas enters the (outside) open end of the spirals and is "squeezed and carried" between the two rings, where it is caught between the scrolls and transported towards the center.
The volume that this limited "slug" of gas occupies reduces as it advances towards the center, which causes it to be constantly compressed until it is released at pressure through a non-return valve at the housing's center. All of the moving elements in the chamber are self-lubricating. However, the PTFE tip seals are prone to wear and eventually need to be replaced.
Scroll vacuum pumps' performance characteristics vary based on various variables, such as the size of the unit, the rate at which it operates, the surrounding temperature, and the properties of the gas or vapor being pumped. Some of the most critical performance qualities are shown in the following (typical) listings:
The pump's leak tightness is less than 10-6 l.s-1, its pumping speed ranges from 3 to 60 m3/hr, and its noise level is less than 55.4 +/- 2.5 dB(A), and an exhaust valve protects against suck-back. The ultimate pressure is approximately 10-2 mbar.
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