Internal circulation heat dissipation fan

Abstract

This disclosure provides an internal circulation heat dissipation fan having a stator and an impeller. The impeller has a hub and multiple fan blades arranged around the hub, the hub having an inner shell and an outer shell sheathing the inner shell, the stator is accommodated in the inner shell, an internal flow channel is defined between the inner shell and the outer shell, the internal flow channel has a side communicated to a space in the inner shell and another side communicated to outside of the outer shell, multiple heat dissipation blades are arranged in the internal flow channel and annually disposed. Each heat dissipation blade has two opposite edges respectively connected to the inner shell and the outer shell.

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