Fluid Couplings
Hydrokinetic fluid couplings
SELECTION OF TRACTION TYPE FLUID COUPLINGS AS A FUNCTION OF POWER TRANSMITTED AND INPUT SPEED
When the fluid coupling is filled with oil the appropriate level and the motor is switched on, oil in the passages between the vanes off the impeller is accelerated radialy outwards gaining energy all the time until it reaches the maximum cicuit diameter. The oil then passes from the impeller to the running in which is forced to move inwards between runner and output shaft . Because the oil passes directly from the impeller to the runner ,(there is no reaction member, as in torque converter), the efficiency is high, with full load slips of between 2 and 5% being achieved in practice and depending on application and size selection.
Windage and oil circulation losses are negligible therefore efficiency equals 100% slip % . Should an overload occur the fluid couping will stall, i.e slip 100 % at a torque value determined by the initial oil filling level . Thus motor and machine are both protected . ELECON hydrokinetic constant filling fluid couplings have the following advantages
PERFORMANCE
The level of performance achieved by Fluid coupling is governed mailny by the design of this working circuit which includes the shape of the circuit, number of vanes in the circuit ,the vanes placement etc . The working circuit developed by Elecon is out of number of years of experience in the field and is vital in the performance of the fluid coupling. Elecon fluid coupling are very rugged in construction, simple in design and reliable in operation .
REDUCED STARTING CURRENT
When Elecon fluid coupling is connected to the drive system it allows the motor to start practically at no load . This results in reduced starting current enabling quick start and accelebration of the drive motor .
SOFT START
It gives gradual start to driven equipment and thus provides smooth and shockless transmission .
LOW MAINTENANCE COST
Driving and driven equipments suffer less wear and tear and thus there is reduction in electrical and mechanical maintenance cost .
PROTECTION TO MOTOR AND MACHINE
In case of overload , accidental jamming, the transmission torque is limited by the fluid coupling and thereby providing protection to the electric motor and the connected machine. In case of extended jamming period, fusible plug blow off will empty the fluid coupling thereby disconnecting the output from the input, and protecting to both driving and driven equipment . To prevent the loss of oil and to have an additional safety device, thermal trig switch can be provided when demandedin addition to the fusible plug .
