Patent ID: 8475119

Claim:
An airflow shielding device configured for being secured to a fan, the airflow shielding device comprising: a first member defining a first through opening; a second member defining a second through opening corresponding to the first through opening; and a plurality of shielding pieces rotatably secured between the first member and the second member, the plurality of shielding pieces can rotate between a closed position, where the plurality of shielding pieces cover the first through opening, and an open position, where the plurality of shielding pieces are located so that air can flow through the first and second through openings; the first member defines a plurality of gaps; a shaft is disposed on each shielding piece; and the shafts are rotatably received in the plurality of gaps; the first member defines a plurality of grooves respectively adjacent to the plurality of gaps; each shielding piece comprises a blocking portion; and the blocking portions are rotated in the plurality of grooves when the plurality of shielding pieces are rotated between the open and closed positions; and a positioning block is located in each groove; and the blocking portions of the plurality of shielding pieces abut the positioning blocks when the plurality of shielding pieces are in the open position.