| 摘要 |
PROBLEM TO BE SOLVED: To protect an air supply fan against scratching by providing left and right blades with coupling cleats between upper and lower blades and the lower surface of a blowing grille and providing the coupling cleat with protrusions, at a constant interval, in parallel with the left and right blades thereby preventing intrusion of an obstacle into a wind circuit. SOLUTION: A plurality of left and right blades 2 for deflecting the wind direction to the left and right are provided, a coupling cleat 1 is provided at the lower part of the left and right blades 2 and protrusions 6 are projected, at a constant interval, from the coupling cleat 1 in parallel with the left and right blades 2. The protrusions 6 of the coupling cleat 1 is provided with a lever shape at the time of manual operation. According to the structure, an obstacle is prevented from intruding into a wind circuit while suppressing lowering of air supply performance and an air supply fan can be prevented against scratching. Since an extra lever is not required, intrusion of an obstacle into the wind circuit can be prevented while saving the space. |
