| 摘要 |
A cooling fan structure includes a hub, a rotary shaft, a fan seat, and a stator assembly. The fan seat is provided on around a front end corresponding to a rear end of the hub with a forward protruded annular rim portion and a sunken annular groove portion adjoining an inner lower side of the rim portion. The protruded annular rim portion reduces a gap between the hub and the fan seat to reduce the amount of air flowing into the hub via the gap and accordingly prevents external foreign matters from invading the hub via the same gap to adversely damage components inside the hub or cause a stuck hub; and the groove portion provides an additional space for receiving invaded and accumulated foreign matters to thereby reduce the possibility of a stuck hub. With these arrangements, the cooling fan can have prolonged service life. |
