SIEMENS
FLENDER Standard Couplings
Fluid Couplings — FLUDEX Series
General information
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Siemens MD 10.1 · 2015
13
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Overview
Coupling suitable for use in potentially explosive
atmospheres.
Complies with the current ATEX Directive for:
II 2 G c T3 IIB -30 °C
≤
T
a
≤
+50 °C
II 2 D T160 °C -30 °C
≤
T
a
≤
+50 °C
I M2
For Ex zones 2 and 22, device category 3 is available upon
request:
II 3 Gc T4 D120 °C II B
FLUDEX couplings marked with Ex are constructed with fusible
safety plugs 110 °C.
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Benefits
FLUDEX couplings are hydrodynamic fluid couplings which op-
erate on the Föttinger principle. The coupling parts on the input
and output sides are not mechanically connected to each other.
Output is transmitted via the oil filling which rotates in the cou-
pling and is conducted over radially arranged blades.
FLUDEX couplings limit starting and maximum torque in the
drive train and, through the property of rotational slip, serve as
an aid to starting the motor, as overload protection in the event
of fault and for isolating torsional vibration.
When large masses are started up, the drive train is accelerated
only at the torque determined by the coupling characteristic. The
starting operation is spread over time, the driven machine
started softly and smoothly.
In the case of special operating conditions, such as overload or
blocking of the driven machine, the FLUDEX coupling limits the
maximum torque load and prevents the inert effect of the rotating
motor mass on the drive train.
The coupling then acts as a load-holding safety clutch until the
drive is shut off by the motor control or coupling monitoring sys-
tem.
The FLUDEX coupling further acts as a means of decoupling
during torsional vibration excitation. Torsional vibration excita-
tion with a frequency of > 5 Hz is virtually absorbed by the cou-
pling.
To compensate for shaft misalignment, the FLUDEX coupling is
combined with a displacement coupling e.g. of the N-EUPEX
type.
All FLUDEX couplings are designed with radial unset blades and
are therefore suitable for rotation in both directions and reversing
operation. They can be fitted horizontally, at an angle or verti-
cally. In the case of FLUDEX couplings with a delay chamber it
must be ensured, when fitting at an angle or vertically, that the
delay chamber is below the working chamber.
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Application
FLUDEX couplings are used in drives for conveyor systems such
as belt conveyors, bucket elevators and chain conveyors. In
heavy industry FLUDEX couplings are used for applications
such as blade wheel drives, crushers, roller presses, mixers,
large ventilators, boiler feed pumps, large compressors, centri-
fuges and auxiliary drives for mills.
Further applications are, for example, pump drives, PTO gener-
ator drives, windpower systems and door and gate drives.
In drives with diesel engine FLUDEX couplings are used on
driven machines with a high mass moment of inertia.
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Design
FLUDEX couplings are constructed of just a few, robust compo-
nents. Internal components include the hollow shaft or solid
shaft (106), to which the blade wheel (105) is connected. The
outer housing comprises the cover (102) and the blade wheel
housing (101). The joint is constructed as a bolted flange joint
and sealed with an O ring. The outer housing and the shaft or
hollow shaft have double bearing support and are sealed off to
the outside with radial shaft seals. The coupling is provided with
two filler plugs (153) with integral overflow protection and with
one or two fusible safety plugs (103) in the coupling housing for
protection against overheating. The fusible safety plug or a
screw plug fitted in the same position also serves as a fluid drain
plug and with the aid of a scale marking on the housing can be
used as a level indicator.
G_MD10_XX_00107
103
105
102
101
153
106
© Siemens AG 2015