Patent ID: 8811010

Claim:
An electronic device comprising: a hollow container; an electronic component received in the container; a fan assembly received in the container and comprising a centrifugal fan and a fin group thermally contacting the electronic component, an outlet defined at a lateral side of the centrifugal fan, and a top inlet and a bottom inlet defined at a central portion of the centrifugal fan and respectively extending through a top end and a bottom end of the centrifugal fan, the fin group comprising a plurality of fins, an air passage defined between each adjacent fins of the plurality of fins, an inner side of the fin group being mounted on the outlet of the centrifugal fan, a bottom surface of the fin group and an inner surface of the container cooperatively defining a first channel therebetween; and a duct received in the container and located at an outer end of the fan assembly, the duct comprising an inlet and a first outlet, the first outlet aligned with an outer end of the first channel; wherein the centrifugal fan guides airflow located at an outside of the electronic device into the duct from the inlet of the duct, then the airflow in the duct flows through the first channel to cool a bottom end of the fin group, then flows out of the first channel and is absorbed into the centrifugal fan through the bottom inlet of the centrifugal fan, and then flow through the air passages of the fin group to cool a central portion the fin group and is exhausted from the electronic device.