The prominent characteristics of a Hydraulic Coupling

A hydrodynamic coupling is a type of hydraulic energy transmission device.

Energy is transmitted through the inertial force of the working fluid. The impeller of the hydrodynamic coupling absorbs mechanical energy from the prime mover, thereby increasing the energy of the working fluid in the circuit. The turbine of the hydrodynamic coupling obtains energy from the working fluid and outputs mechanical energy.

Prominent Features:

1. Low energy loss: Under normal stable operation with minimal slip, the hydrodynamic coupling achieves high transmission efficiency. Energy loss is mainly concentrated on bearing seals and wind resistance, while the core hydrodynamic transmission loss is minimal.

2.Fluid coupling starts smoothly without impact under loaded or unloaded conditions: The motor can start under no-load or minimal load conditions, and the fluid coupling enables smooth, shock-free acceleration of the load.

3. Rapid current decay and low starting current, causing only minor current pulses: Due to the implementation of "soft start" in the fluid coupling,the demand for high torque at direct start is avoided, significantly reducing the starting current.

4. Load compensation for multi-motor drive systems: When two or more motors drive a single load (such as a long belt conveyor or a large scraper conveyor) via hydraulic couplings, even if there are slight differences in motor characteristics, the hydraulic couplings can automatically adjust its internal oil volume or slip to ensure that the load is evenly distributed among the motors, preventing any single motor from being overloaded.

5. Effective vibration isolation system: Fluid coupling can effectively attenuate torsional vibrations transmitted from the motor or the load side, preventing their mutual transmission.

6. Hydraulic couplings can protect against changes in impact, vibration, and load: When the load side suddenly stalls or experiences a significant impact, slip (speed difference) can occur between the driving and driven components of the hydrodynamic coupling. The impact energy is absorbed and cushioned by the flow and friction of the oil, preventing it from being directly transmitted to the motor and upstream transmission system.

7. Hydraulic couplings provide overheat protection by installing fusible plugs, mechanical or electronic switch devices:Fusible plugs are the most commonly used mechanical protection for hydraulic couplings. When the internal oil temperature of the fluid coupling rises to the set value (such as 125 ℃, 140 ℃) due to long-term overload, the alloy of the fusible plug melts, spraying out the working oil in the fluid coupling and cutting off power transmission, thereby protecting the equipment. Hydraulic couplings can also be equipped with mechanical or electronic switch devices, which can send signals or directly cut off the motor power supply when the temperature of the fluid coupling is abnormal, achieving more precise control and protection.