Plug-in fans are indispensable equipment in daily applications, and their bearings play a critical role during normal operation. Plug-in fans deliver comfortable ventilation environments and unprecedented development opportunities for numerous industries, while greatly safeguarding occupational safety for workers. Against this background, this paper discusses how to calculate the service life of high-temperature bearings used in plug-in fans.

The key components of a plug-in fan include the impeller, air inlet, air outlet and motor. The motor acts as the power source; its rotation drives the main shaft and impeller to revolve, generating pressure differences to force air circulation and realize ventilation. Among all these components, the service life of the main shaft assembly determines the overall service life of the plug-in fan, as the main shaft transmits rotational speed output throughout the whole unit. Extending the service life of the main shaft effectively prolongs the total service life of the fan, bringing significant benefits to production continuity and equipment longevity. Hence, research on main shaft and bearing life is an essential topic for fan application.

Before reaching the end of its service life, the main shaft can operate stably with steady rotational speed, torque and power transmission output. The theoretical design life of the main shaft bearing is calculated based on the dynamic load rating of the bearing and its design load, adopting the standard bearing life formula. The calculated result can serve as a reference benchmark for users of high-temperature fans. With a clear rated design life, users can fully grasp the service cycle of high-temperature bearings on plug-in fans and arrange scheduled bearing replacement in advance, so as to prevent potential safety incidents in production.