| 摘要 |
A heat dissipation device for a computer case is positioned over a hole of the computer case. The heat dissipation device includes a fan, two motors, two plates, and a controller. The fan is fixed in the computer case, and covers the hole. The two motors are positioned at two opposite sides of the fan. Each motor has a motor shaft parallel to a fan shaft of the fan. The two plates are respectively fixed on the two motor shafts. A distance between the two plates along the direction parallel to the motor rotor is greater than or equal to the thickness of the board. A controller is electrically connected to the fan and the two motors. The controller controls the two motors rotate the two boards for exposing or blocking the hole as the fan is on or off.
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