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Attention: The pump needs regular maintenance; otherwise there will be damage, or even
reduction of its life. Cut down circuit before check and repair, and only operate when power is off.
Attention: The temperature of operation environment should be 5°C- 40°C to prevent the pump
from damaging and shortening the life of use.
Attention: The pump should be put at safe places with proper ventilation, solid and flat base, and
clean floor, without corrosive gas. Otherwise, the pump will be damaged and the life of use will be
shortened.
Attention: In cold area, the coolant jacket must be drained after car stopped. Otherwise the
coolant may freeze and thus damage the pump shell.
2. Survey
2.1 Introduction
Roots pump have Vortex series and Vortex B series. As the input pressure is between 6.5-65 Pa,
the pumping speed is no less than 250m3/h, 500m3/h, 1000m3/h, 2000m3/h, 5000m3/h,
6000m3/h and 9000m3/h. It is a kind of roots vacuum pump in which a couple of lobed rotors turn
like 8- shape in high speed synchronously. Two rotors rotate
and produce aspiration and exhaust which principle is just like a
roots blower. As it works in a lower pressure, the free flow
distance of gas molecule is longer and the resistance of gas
passing a small gap is much large. Thus, a bigger compression
ratio can be gained so that it can also be used as a blower
pump. But it cannot discharge the gas to atmosphere directly
and requires to be used with a vacuum pump in series
connection.
Then the sucked gas is discharged to atmosphere through the
vacuum pump (as Diagram 1).
2.2 Features
(1) There are definite gaps between rotor and pump’s cavity, rotor and rotor which are not in
contact. As a result:
a. No friction, lower power consumption that is compared with an oil sealed mechanical vacuum
pump of the same pumping speed.
b. No Oil-sealing and lubrication so as to avoid being polluted to the vacuum pump by oil steam.
c. It is ok for pumping the gas with a little dust.
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