| 摘要 |
An exemplary heat dissipation device includes a centrifugal fan and a fin assembly. The centrifugal fan includes a fan frame and an impeller mounted in the fan frame. The fan frame includes a base plate, a cover plate and a side wall extending between the base plate and the cover plate. An air outlet is defined in the side wall. The fin assembly is arranged at the air outlet. The cover plate defines an air inlet corresponding to the impeller and forms an air blocking portion near the air outlet. The air blocking portion defines a space therein. A total cross-sectional area of the space of the air blocking portion increases from an inner side of the air blocking portion near the impeller to an outer side of the air blocking portion near the fin assembly, so that the airflow generated by the impeller can be prevented from reflowing back to the impeller from the fin assembly.
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