Disk-shaped fan impeller structure

A disk-shaped fan impeller structure comprising:

• a hub having a top wall and a circumferential wall perpendicularly extending from an outer circumference of the top wall, the top wall corresponding to a wind inlet of a fan frame;
• a plate body having an inner rim and an outer rim, the inner rim surrounding and facing the circumferential wall of the hub, the outer rim radially extending in a direction away from the hub, a top face and a bottom face being defined between the inner rim and the outer rim, multiple upper boss bodies being arranged on the top face between the inner rim and the outer rim at intervals, a first gap being defined around each upper boss body;
• and
• multiple connection members disposed between the circumferential wall of the hub and the inner rim of the plate body, the connection members being arranged at intervals in a radial form to radially extend, each connection member having an inner end and an outer end, the inner end being connected with the circumferential wall of the hub, the outer end being connected with the inner rim of the plate body.