Gas ballast version with ball valve:
The gas ballast line can be closed partially or completely by means of a
ball valve.
In order to improve the operating characteristics the outlet of the
pump chamber is equipped with a spring loaded valve (q, 159).
Oil Circulation
The vacuum pump requires oil to seal the gaps, to lubricate the vanes
(r, 22) and to carry away compression heat.
The oil reservoir is located on the pressure side of the vacuum pump
(i.e. high pressure) at the bottom of the bottom chamber of the oil
separator (o, 75).
The feed openings are located on the suction side of the vacuum pump
(i.e. low pressure).
Forced by the pressure difference between pressure side and suction
side oil is being drawn from the oil separator (o, 75) through the oil
supply lines (210) and injected on the suction side.
Together with the sucked gas the injected oil gets conveyed through
the vacuum pump and ejected into the oil separator (o, 75) as oil mist.
Oil that separates before the exhaust filter (p, 122) accumulates at the
bottom of the bottom chamber of the oil separator (o, 75).
Oil that is separated by the exhaust filter (p, 122) accumulates at the
bottom of the upper chamber of the oil separator (o, 75).
The flow resistance of the exhaust filters (p, 122) causes the inside of
the exhaust filters (which is connected to the bottom chamber of the
oil separator) to be on a higher pressure level than the outside of the
exhaust filters (i.e. the upper chamber of the oil separator). Because of
the higher pressure in the bottom chamber it is not possible to let oil
that drips off the exhaust filters simply flow down to the bottom
chamber.
Version with float valve and oil return line to the suction connection (j,
200):
Therefore the oil that accumulates in the upper chamber is sucked
through the float valve (j, 200) and the oil return line (j, 195) to the
suction connection (250).
Version with oil return valve (f, 280):
At continuous operation this would cause the entire supply of oil to ac-
cumulate at the bottom of the upper chamber, expel oil droplets
through the gas discharge/pressure connection and let the pump run
dry. Therefore the vacuum pump must be shut down at the latest after
10 hours of continuous operation, depending on the operating condi
-
tions even after a shorter period, for at least approx. 15 minutes (Ú In
-
stallation and Commissioning à Operating Notes). After turning off
the vacuum pump the pressure difference between the inside and the
outside of the exhaust filter(s) (p, 122) collapses, hence the two cham
-
bers of the oil separator assume an equal pressure level, the oil return
valve (f, 280) between the two chambers opens and the accumulated
oil in the upper chamber can run down to the bottom chamber.
Cooling
The vacuum pump is cooled by
–
radiation of heat from the surface of the vacuum pump incl. oil
separator (o, 75)
–
the air flow from the fan wheel of the drive motor (400)
–
the process gas
–
the air flow from the fan wheel (e, 321) on the shaft of the
vacuum pump
On/off Switch
The vacuum pump comes without on/off switch. The control of the
vacuum pump is to be provided in the course of installation.
Safety
Intended Use
Definition: For the purpose of these instructions, “handling” the
vacuum pump means the transport, storage, installation, commission
-
ing, influence on operating conditions, maintenance, troubleshooting
and overhaul of the vacuum pump.
The vacuum pump is intended for industrial use. It shall be handled
only by qualified personnel.
The allowed media and operational limits (Ú Product Description)
and the installation prerequisites (Ú Installation and Commissioning
à Installation Prerequisites) of the vacuum pump shall be observed
both by the manufacturer of the machinery into which the vacuum
pump is to be incorporated and by the operator.
The maintenance instructions shall be observed.
Prior to handling the vacuum pump these operating instructions shall
be read and understood. If anything remains to be clarified please
contact your Busch representative!
Safety Notes
The vacuum pump has been designed and manufactured according to
the state-of-the-art. Nevertheless, residual risks may remain. These op
-
erating instructions inform about potential hazards where appropriate.
Safety notes are tagged with one of the keywords DANGER,
WARNING and CAUTION as follows:
DANGER_a
Disregard of this safety note will always lead to accidents with fa
-
tal or serious injuries.
WARNING_a
Disregard of this safety note may lead to accidents with fatal or se-
rious injuries.
CAUTION_a
Disregard of this safety note may lead to accidents with minor inju
-
ries or property damage.
Emission of Oil Mist
CAUTION_a
The non-OEM spares market offers exhaust filters that are geomet
-
rically compatible with Busch-vacuum pumps, but do not feature
the high retention capacity of genuine Busch-exhaust filters.
Increased risk of damage to health.
In order to keep the emission on the lowest possible level only gen
-
uine Busch-exhaust filters shall be used.
The oil in the process gas is separated to the greatest possible extent,
but not perfectly.
CAUTION_a
The gas conveyed by the vacuum pump contains remainders of oil.
Aspiration of process gas over extended periods can be harmful.
The room into which the process gas is discharged must be suffi
-
ciently vented.
Note: The possibly sensible smell is not caused by droplets of oil,
though, but either by gaseous process components or by readily vola
-
tile and thus gaseous components of the oil (particularly additives).
Safety RA 0025 - 0040 F
page 4 0870139077 / 051214
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