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The pump consists of two figure “8” shaped rotors and two
semicircular pump houses. The rotors rotate synchronously in
opposite directions and high speeding. The pump cannot be used
singly; it must be used as boosters combined with a backing
pump such as a rotary piston or a rotary vane vacuum pump, or a
liquid ring vacuum pump. These vacuum systems can get higher
vacuum, a stable, fairly high pumping speed can be gained in
effective pressure range. The backing pump decides the ultimate
pressure of roots pump. The data of the list is lowest ultimate
pressure with the standard equipment (equipped double stage oil
machine vacuum pump).
The Roots pumps are widely used in vacuum moulding, vacuum
smelting, vacuum gas pumping, vacuum coating industry, vacuum
distilling and vacuum
drying of chemical and pharmaceutical industry etc. The pump is
insensitive to a little dust.
1. The lack of reciprocating parts allows a perfect dynamic
balancing, because the rotors is processed by numerical control
machine tool and balanced carefully.
It has perfect geometry symmetry. There is certain clearance
between the two rotors. The pump house and end
cover is processed by especial machine tool. It has high precision.
So the pump own feature of stable operation, low noise, low
vibration and high ultimate pressure.
2. The robust drive of ump and operating parts balanced carefully
permit that the pump be stably operated continuously under the
condition of high different pressure.
3.They can be started quickly, and in short time ultimate pressure
4. Lubrication is unnecessary as there is no contact between
rotors, rotor and house, that avoid oil vapor from polluting vacuum
5. Good reliability characteristic. Their inherent overflow valve
play auto-protective role.
6. Compact structure, low footprint design. There are three gas
outlet ports that are in left, right and under pump house. It is
convenient for consumer installing.
maximum permissible different pressure