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Roots Vacuum Pumps and Systems
RUVAC Roots Vacuum Pumps
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Roots vacuum pumps, which are also called
Roots blowers, are rotary plunger type pumps where two symmetrically
shaped impellors rotate in opposite directions inside the pump
housing. In general they are used to improve operating pressure of a
pump system and to increase its pumping speed. |
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Roots Pump Uses
Shifting the Operating Pressure into the
High Vacuum Range - Roots vacuum pumps are
capable of improving the attainable ultimate pressure of a pump system by
a factor of 10. With two Roots vacuum pump stages and a corresponding
backing pump it is possible to attain pressures in the range down to 10-5
mbar (0.75 x 10-5 Torr). Under certain circumstances this will make the
use of additional high vacuum pumps (turbomolecular pumps or diffusion
pumps) unnecessary.
Multiplied Pumping Speed - Due
to the non-contact rotation of the impellers, Roots vacuum pumps are able
to run at higher speeds. Thus a high pumping speed is obtained with a
relatively small size pump. Pumping speeds in excess of 1000 m3/h (589 cfm)
can only be attained with Roots vacuum pumps. When selecting the
right kind of backing pump (sizing) it is possible to pump large
quantities of gas in connection with smaller backing pumps. Energy
consumption of such a pump system is much less compared to a single
backing pump offering the same pumping speed.
Applications
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Semiconductor technology; in etching
processes and in use with dry compressing vacuum pumps. |
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Backing a turbomolecular pump |
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Central Vacuum Supply Systems |
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Chemistry; |
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Laser Systems; continuous circulation
of the gas in order to remove heat from a closed cycle in which
pressure differentials must be maintained |
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Increasing the pumping speed or
ultimate pressure of any pump or pumping system |
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Advantages
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Through an integrated bypass the
pumping speed of the Roots vacuum pump can be used at high pressures
and loads. This reduces the pumpdown time especially for cyclic
operation |
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Canned motors are hermetically sealed and
there are no seals in contact with the atmosphere which might be subject
to wear. This prevents leaks and failures due to oil leaks. These
features are necessary when pumping high-purity or hazardous gases. |
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A service life of over 20000 hours
without maintenance is quite common. |
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Tolerances, quality of balancing,
force-fed lubricated bearings and toothed gears permit high speeds and
the use of frequency converters. Thus it is possible to attain a high
pumping speed while the process is in progress and to reduce the speed
when the process has been stopped or while changing the batch. This
results in a lower consumption of energy and a longer service life with
uncompromised reliability. |
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Conversion from vertical to
horizontal flow is easily implemented and can be performed in-situ.
Thus the pump can be adapted more closely to the
operating conditions of your system. |
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Roots vacuum pumps are capable of
compressing the media in the pump chamber without the addition of any
further media. This avoids interaction between different media in the
pump itself and also in the connected vacuum chamber. The medium which
is pumped is not contaminated with lubricants or sealants; complex
accessories (exhaust filters, separators, etc.) are not needed; the
lubricant in the side chambers is hardly affected, so that service life
is not reduced; backstreaming of oil from the backing pump into the
connected vacuum chamber is prevented. |
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The effective air cooling arrangement
reduces operating costs to a minimum. Cooling water is not required. |
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RUTA Roots Vacuum Pump Systems
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Standard RUTA Systems with Oil-Sealed Pumps
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Standard RUTA Vacuum Systems
Roots vacuum pumps WA, WS and RA or WAU and
WSU with integrated bypass line or RA with external bypass line (RAU) are
combined with oil-sealed backing pumps for conventional vacuum generation.
Single-stage arrangements are capable of delivering pumping speeds of 250 to
16000 m3/h (147.3 to 9424 cfm). Higher pumping speeds can
be attained by paralleling several pumps. The attainable operating pressures
depend on the number of pumping stages. For higher pumping speeds or
lower ultimate pressures, three or multistage pump systems equipped with
single or two-stage backing pumps are available. |
| Dry-Compressing RUTA Vacuum Pump
Systems
Increasing environmental awareness, pumping of
condensable vapors, or strict non-contamination requirements when pumping
high quality media for recycling, often requires the use of universal
pumps where the pump chamber is free of operating agents (dry
pumps). Here Leybold offers two solutions:
- Pump systems consisting of the ScrewLine screw vacuum
pump developed specifically for the process industry in combination
with one or several Roots vacuum pumps.
- Single or multi-stage RUTA RAV vacuum pump systems,
consisting of Roots vacuum pumps with preadmission cooling.
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Dry RUTA System with SP630 ScrewLine Dry Pump
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RUTA Pump Systems for the Chemical Industry
In chemical processes
it is often necessary to remove corrosive, condensable and reactive gases
and vapors. Leybold designs and manufactures custom-built pump systems for
specific process applications. Depending on the application, the backing
pump used in such systems may be a rotary vane vacuum pump, a liquid ring
vacuum pump or a combination of an ejector pump and a liquid ring pump. To
ensure dependable monitoring of the system, the following monitoring
devices, among others, may be installed:
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temperature sensors
to monitor the gas temperatures between the pump stages and the pump
body temperature, |
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water flow monitors
for the cooling water supply to pumps and condensers, and |
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differential
pressure indicator with control setpoint to monitor the exhaust
filters of the rotary vane vacuum pump. |
If vacuum systems are used to pump larger
quantities of vapor or vapor-gas mixtures, it is economical to insert
condensers which are cooled with water or a different coolant at a
suitable place within the pumping system. Cooled condensers are themselves
effective partial pumps which condense most of the vapors from the pumped
media. The downstream mechanical pumps will then only need to pump those
gases which have not already condensed. The quantity of vapor present in
each case determines the size of the condenser and the temperature at
which it is operated. The size of the downstream pump is determined by the
quantity of non-condensable gases, the required pressure and the required
pump-down time for the system. All pump systems of the WA/WAU and RA/RAU
series may be equipped with one or several condensers. These are often
used in the chemical industry. Here RUTA vacuum pump systems with
condensers are not only used to generate a vacuum, but they are also often
employed in the recovery of solvents. When installing one or several Roots
pumps upstream of a condenser, low operating pressures and high
condensation pressures can be attained. Thus the condenser may in many
cases be operated with cooling water instead of brine. The vapor
components pumped together with inert gases may be separated once more in
an emission condenser on the exhaust side so that the quality of the
exhaust gas can be maintained within close purity tolerance.
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Evaporation and
Distillation Applications (TVD)
More and more vacuum applications are
finding their way into the areas of environmental protection, recycling
and waste disposal. The combination of vacuum know-how, innovative
engineering and applications know-how is indispensable for the successful
application of vacuum technology in most widely differing applications.
The product is no longer in the foreground, solutions to problems are
demanded instead. Leybold Vacuum has developed some continuously operating
vacuum pump systems for these applications. These systems basically
consist of a rotary vane pump with a condenser unit. Upon request the
condenser arrangement may also be equipped with a cold water set. This
version will then be independent of any cooling water connections and –
being a mobile system – it is well-suited for operation at varying
locations.
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TVD Mobile Pump System with
Control Cabinet
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Three-stage RUTA System with Liquid Ring vacuum pump and Mixing
Condensers |
RUTA Custom Pumping Systems
Most users will be able to select the right pump
system for their application from our range of standard pump systems. In special
cases a custom design may be required for special processes and high pumping
speeds. We are prepared to design and manufacture custom pump systems according
to customers specifications. Besides oil-sealed and dry compressing backing
pumps, we can incorporate liquid ring and ejector pumps as required for your
application.
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RUTA Pump Systems for the Metal Producing and
Processing Industry
In common vacuum furnace processes such as
hardening, annealing, brazing, melting and casting, oil-sealed or dry
compressing standard vacuum pump systems are usually used. The oil sealed
systems consist of a combination of Roots vacuum pumps with a single or
two-stage rotary vane or rotary piston pump. In the dry compressing
systems our screw vacuum pump ScrewLine is used as the backing pump. The
vacuum pumps are mounted in a rugged frame. The design of the pump systems is
service-friendly, modular and can be easily upgraded with additional
equipment. On smaller furnaces RUVAC WAU Roots vacuum pumps are the most
suitable because these may be cut-in at a higher operating pressure, while on
larger furnaces and particularly where short pump-down cycles are required, the
use of RUVAC RA Roots vacuum pumps with suitably sized backing pumps is
advisable. For special processes, e.g. fusion or degassing of molten masses, due
to the high dust content, the additional use of a dust separator is required as
well as equipping the backing pumps with oil filtering units.
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