| 摘要 |
The invention concerns an anti-fog device comprising: a duct (1, 101, 102) having a top orifice and a bottom orifice facing a base or the ground; a member (3, 106, 107) for generating an air stream in the duct (1, 101, 102) between said orifices; means (4, 100) protecting a base or ground part, said means being associated with a system (4A, 109, 110) providing a minimum distance (ha) between the means (4, 100) and a base or ground part, so as to form between the means and said base at least an air passage communicating with the duct (1, 101, 102), wherein the top orifice has a passage section perpendicular to the mean direction of the air stream in the proximity of the top orifice, whereas the means protecting a base part has a protection section perpendicular to the mean direction of the air stream in the proximity of the bottom orifice, the ratio of protection section over the top orifice passage section ranging between 1,5 and 20. |
