Return air blocking device for fan-based heat dissipation mechanism

Abstract

A return air blocking device for a fan-based heat dissipation mechanism includes a plurality of rotatable hinged plates provided in a heat-dissipation mechanism having a plurality of fans. The rotatable hinged plates are lifted open or shut due to the presence or absence of airflow kinetic energy. When some of the fans fail, the corresponding rotatable hinged plates are shut to prevent hot exhaust from returning to and being detained in the heat dissipation mechanism.

1 . A return air blocking device for a fan-based heat dissipation mechanism, essentially comprising a plurality of rotatable hinged plates provided at outer sides of a plurality of air outlets of a chassis such that the rotatable hinged plates correspond in position to a plurality of fans mounted in the chassis, wherein when all the fans in the chassis are in normal operation, all the rotatable hinged plates are rotated and thus lifted open by kinetic energy of airflow driven by the fans, wherein when one of the fans fails, at least a corresponding one of the rotatable hinged plates drops automatically due to gravity so as to be shut, thereby preventing external air or hot exhaust discharged via a neighboring said fan from being sucked into the chassis. 
     
     
         2 . The return air blocking device of  claim 1 , wherein at least one of the rotatable hinged plates is provided at an air outlet of a fan frame configured for receiving a blower fan mounted securely in the fan frame, and the fan frame which is mounted securely with the blower fan and whose said air outlet is provided with the at least one rotatable hinged plate is conveniently installed on the chassis.