Fluid Couplings (Models C” ) are basically, 'constant speed, constant filling, hydrodynamic fluid couplings, The basic power transmission is through a stream of 'fluid'-most commonly, oil, circulating between an impeller and a runner. The kinetic energy of oil leaving impeller is taken-up by runner and the oil is returned back to impeller. In Operation, impeller is driven by the prime-mover-generally electric motor, and the runner drives the machine.
When the motor fitted with a fluid coupling, is started the motor accelerate and continues to run at near to its rated speed the torque builds up gradually. During this start-up, the difference of speeds, between impeller and runner-the slip is maximum. Because of this slip, the output-torque is greater then the input torque, due to the multiplied kinetic energy imparted to the oil, by impeller. This increased output torque enables the motor to start and accelerate, machines of higher inertia. Once the machine, is accelerated and is running at constant speed, the input and output torques are equal. But to transmit this torque there is an inherent slip of about 3% to 5% between input and output speeds. This indicates the efficiency of a coupling. So, in normal operations, the input and output torque of a coupling are equal but the speeds are reduced by 3% to 5%.
Agitators, Ball and Tube Mills, Centrifuges, Centrifugal Crushers, Drum Transmission, Construction Machinery, Cement Plants Machinery, Elevators, Fans/Heavy Trucks, Kneaders, Locomotives, Marine Propulsion, Mixers, Pulverisers, Paper Plant Machineries, Rotary Kilns, Rope ways, Steel Rolling Mills Soaps Plodders, Sugar Mills Machinery, Textile Machineries, Tractors, Wire Drawing, Stranding and Cabling Machines. The Fluid couplings are available as : A) In-line type, when machine & motor shafts are in line. B) Pulley type, when machine & motor shafts are parallel & driven by V-belts.