Constant-fill fluid couplings are self-contained drive components mainly used for soft start, torque limitation and dampening of torsional vibrations within the drive line. The different models vary in type and design of volumetric chambers, this determines the start-up behaviour.
Types as follow:
T- basic version
The type T fluid coupling is the basic version of a constant-filled coupling, consisting of pump wheel, turbine wheel and outer shell. These couplings are particularly suitable if overload protection and vibration damping are required. Your drive equipment is then protected with the added benefit of increasing system productivity. This fluid coupling is also available with two work circuits (type DT). The parallel acting circuits double the power transmission. Additionally, Voith also offers fluid couplings with water as the operating medium (type TW). This is critical when operations are located in potentially explosive atmospheres. Furthermore, spheroidal cast iron outer casings (type TU) are available and meet the required material specifications.
TV – with delay chamber
The type TV fluid coupling is comparable to the type T fluid coupling, however enhanced with a delay chamber. When starting up, torque is reduced, enabling the driven machine to start gently. This fluid coupling is also available with two coaxially arranged work circuits (type DTV); the parallel acting circuits double the power transmission. Additionally, Voith offers fluid couplings with water as the operating medium (type TWV). This is critical when operations are located in potentially explosive atmospheres. Furthermore, spheroidal cast iron outer casings (type TUV) are available and meet the required material specifications.
TVV – with enlarged delay chamber
The type TVV fluid coupling is comparable to the type TV fluid coupling; however, it is enhanced with an enlarged delay chamber. When starting up, there is much less operating fluid in the working circuit. The driven machine starts up more gently, and the torque limitation behaviour is significantly stronger during the start-up. This fluid coupling is also available with two working circuits (type DTVV); the parallel acting circuits double the power transmission. Furthermore, Voith offers fluid couplings with water as the operating medium (type TWVV). This is critical when operations are located in potentially explosive atmospheres. Furthermore, spheroidal cast iron outer casings (type TUVV) are available and meet relevant material requirements.
TVS – with delay chamber and annular chamber
The type TVS fluid coupling is comparable to the fluid coupling type TV, however enhanced with an annular chamber. This results in more operating fluid in the coupling. Additionally, Voith offers fluid couplings with water as the operating medium (type TWVS). This is critical when operations are located in potentially explosive atmospheres. Furthermore, spheroidal cast iron outer casings (type TUVS) are available and meet the required material specifications.
TVVS – with enlarged delay chamber and annular chamber
The type TVVS fluid coupling is comparable to the type TVV fluid coupling, although enhanced with an annular chamber. When idling, the fluid levels in the delay chamber, working circuit and annular chamber are identical. The driven machine starts up extremely gently, and the increase in torque is dependent upon the load. Additionally, Voith offers fluid couplings with water as the operating medium (type TWVVS). This is critical when operations are located in potentially explosive atmospheres. Furthermore, spheroidal cast iron outer casings (type TUVVS) are available and meet the required material specifications.
TV..F – with centrifugal valves
Centrifugal valves control the filling and draining of the working circuit of the coupling and thus the power transmission. The motor starts up almost load-free, even in the event of a voltage drop. The coupling torque is released shock-free and continuously, until the required breakaway torque of the system is built up. This permits overloaded driven machines to be started up. Additionally, Voith offers fluid couplings with water as the operating medium (type TWV..F).This is critical when operations are located in potentially explosive atmospheres. Furthermore, spheroidal cast iron outer casings (type TUV..F) are available and meet the required material specifications.
TV..Y – with refilling holes
Thanks to the dynamic re-filling, the operating fluid is guided from the working circuit into the delay chamber during start-up, depending on the slippage. This ensures an almost time-independent torque limitation and is thus suitable for longer start-up times. This fluid coupling is available with two coaxially arranged work circuits (type DTV..Y); these parallel circuits double the power transmission. Additionally, Voith offers fluid couplings with water as the operating medium (type TWV..Y). This is critical when operations are located in potentially explosive atmospheres. Furthermore, spheroidal cast iron outer casings (type TUV..Y) are available and meet the required material specifications.
Thermal Monitoring and Switching Devices
BTM (non-contact thermal monitoring device)
Continuously determines the temperature of the operating medium in the fluid coupling and provides an active analog signal that can be continuously monitored for safety. It can also be used for process control. Typically used on belt conveyors with long and frequent start-up procedures, as well as crusher and shredder applications.
BTS (non-contact thermal switching device)
Monitors the coupling temperature contact-free. When reaching the activation temperature, the BTS switches the motor off or triggers an alarm signal. This system is particularly suitable for applications with long start-up procedures or frequently occurring overloads. Typical fields of application for the BTS are, for example, medium and long belt conveyors, crushers, hammer mills and bucket wheel excavators. The BTS Ex is available for use in potentially explosive.
MTS (mechanical thermal switching device)
Monitors the temperature of the coupling. When reaching the activation temperature, it switches the motor off or triggers an alarm signal. The MTS is particularly suitable for applications where thermal overloading is not very common, e.g., where start-up procedures are short and occur infrequently. The MTS is predominantly used for mixers, short belt conveyors and bucket conveyors. It is also suitable for use in potentially explosive atmospheres.