FLENDER Standard Couplings Fluid Couplings — FLUDEX Series © Siemens AG 2015 General information ■ 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. ■ Benefits FLUDEX couplings are hydrodynamic fluid couplings which op- erate on the Fцttinger 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. 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. 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.
To compensate for shaft misalignment, the FLUDEX coupling is combined with a displacement coupling e.g. of the N-EUPEX type. 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. 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. 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. ■ 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. ■ 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.
13 103 105 101 102 153 106 G_MD10_XX_00107 13/2 Siemens MD 10.1 · 2015