Abstract: A heat-dissipating fan includes a casing having an air outlet, a base mounted in the air outlet, an impeller being mounted on the base and having a plurality of blades, a plurality of ribs each extending between the base and the casing along a radial direction of the base, and at least two air-guiding ring fixedly mounted to the ribs. The air-guiding rings vary in inclinations along a longitudinal direction of the casing. The air-guiding ring guides airflow in various directions, and divides airflow passing through the air outlet when the impeller is turning.

Abstract: A heatsink device includes a base board provided with multiple fins and multiple channels formed between any two adjacent fins. Each of the channels has a first end formed with an air inlet and a second end formed with an air outlet. The base board is provided with a mounting portion. An impeller is combined on the mounting portion of the base board, and a cover plate is combined on a top of the base board. The impeller includes a power member to drive a blast type vane to rotate. The vane is aligned with the channels formed between the multiple fins, to drive an air flow from the air inlet at one side of the base board to the air outlet at the other side of the base board.