Bollfilter, Type-6.48: Functional description of the automatic filter
The automatic filter is
used to filter particles from media in order to protect the downstream parts of
the plant such as bearings, journals and shafts in the motor from damaging
impurities in the oil.
The automatic filter is
suitable for filtering liquid media (oils) with an operating pressure of at
least 3 bar.
It works with permanent
medium backflushing. The backflushed liquid is fed back into the circulation
tank or oil tank.
Filtration
stage
Figure: Filtration Stage |
1 Filter candle inlet- N1
2 Connecting pipe outlet-
N2
3 Protective sieve
4 Turbine
The medium being
filtered passes through the inlet flange and turbine to the bottom end of the
filter candles. A partial current is fed via the connecting pipe to the top end
of the filter candles.
This means that the
medium flows through the filter candles at both ends, from the inside to the
outside, and in the process larger particles of dirt are held back on the
inside of the filter candles.
The filtered medium
then proceeds to the filter outlet through the protective sieve.
Backflushing
stage
Figure: Backflushing Stage |
1 Rotary indicator
|
7
Bottom sieve plate
|
2 Inspection glass
|
8 Cog wheel
|
3 Top flushing arm
|
9 Worm gear pair
|
4 Top sieve plate
|
10 Turbine
|
5 Coupling pipe
|
11 Bottom flushing
arm N1 Filter inlet
|
6 Filter candle N2
Filter outlet
|
N3 Flushing oil outlet
|
The flow energy drives
the turbine which is integrated in the inlet flange. The worm gear pair and cog
wheel reduce high speed turbine speed to low speed to rotate the flushing arm.
The individual filter
candles are connected alternately to the atmosphere and the flushing bush and
nozzle (optional) by the continuously rotating flushing arms.
By this a pressure
gradient, which has a particularly efficient cleaning effect on the filter
candles, is produced. This connection is established alternately by the bottom
and top flushing arm. In each case, the opposite side of the filter candles is
closed at the same time. This also changes the direction of flow of the medium through
the filter candle which in turn increases the cleaning effect.
The turbulent flow
created in the longitudinal direction of the filter candle (cross flow
backflushing) and the counterflow backflushing through the filter material lead
to a particularly enduring backflushing effect.
The combination of cross-flow backflushing and counterflow backflushing causes the pressure loss in the filter to remain constant.
The combination of cross-flow backflushing and counterflow backflushing causes the pressure loss in the filter to remain constant.
Overflow
valves
Figure: Overflow Valves |
1 Filter candle N1 Filter inlet
2 Overflow valve N2 Filter outlet
3 Differential pressure monitoring
N3 Flushing oil outlet
4 Protective sieve
If, for any reasons,
the filter candles are no longer sufficiently cleaned (i.e. dirty), the
overflow valves open automatically from a defined differential pressure level
and the medium is partly filtered through the protective sieve only (emergency
mode).
However, before this
status occurs, a differential pressure signal (first contact) is issued by the
optional differential pressure monitoring systems. The cause must then be localized
and remedied.
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