Fläkt med dammtät anordning

摘要

The dust-proof apparatus has a casing (10) with a passage (11). The fan is positioned inside the casing. The cylindrical dust-proof filter is positioned at the entrance (12) of the passage and is integrally coupled on the rotational shaft (91) of the fan (900) to rotate along the blades. The central portion of the dust-proof filter has a blocking portion and has multiple protrusions on its surface. The surface of the dustproof filter is formed as a waveform in the circumferential direction.