Centrifugal Fan Coupling

In a direct-drive centrifugal fan, the coupling is the only mechanical connection between the motor shaft and the fan shaft. If the wrong flexible coupling is selected, even slight shaft misalignment, start-up torque jerks or general vibration can flow directly through the motor and fan bearings. As a result, both of these parts wear out very quickly together. Among the most common and most expensive reasons of unplanned shutdowns in industrial fan operation are uncontrolled misalignment and vibration failure of the bearings. However, if a Centrifugal Fan Coupling is used correctly in the fan. It completely blocks this danger. It easily handles any angular, parallel and axial misalignment of the parts, absorbs shock and vibration between the motor and the driven part and continues to deliver full rated torque without any slip.

The coupling type is selected according to the torque, speed and misalignment profile of the application. Jaw couplings or spider couplings are the standard choice for general and HVAC fans. Because it requires no lubrication, it has a fail-safe design and its elastomeric spider can be replaced without removing any machine. Tyre couplings are specified in heavy industrial fans, ID fans, FD fans, where 2~4° angular misalignment tolerance and improved shock absorption are required. Disc couplings are used in fan drives with speeds greater than 3,000 RPM. It's used where torsional rigidity and zero-backlash motion transfer are most important. Grid couplings and gear couplings are available for extremely high-torque heavy industrial applications. You can get its hub bores as pilot bores, which have to be machined to the size of the shaft. Or you can also opt for a taper lock configuration for quick, hassle-free mounting and opening. To find the design torque, multiply (motor kW × 9,550 ÷ RPM) by (service factor 1.0~1.25) for the smooth load of the fan. Then, a Centrifugal Fan Coupling of such a size is selected whose rated torque is always greater than this calculation.