| 摘要 |
PROBLEM TO BE SOLVED: To reduce a noise by forming a fan finger guard low in fluid efficiency and an asymmetric, eccentric and non-coaxial finger guard. SOLUTION: An asymmetric, eccentric and non-coaxial finger guard shape A has a noise level of 47dBA, and shapes B to D have a noise level of only 44dBA. Therefore, the finger guard shapes A to D can be improved up to 90% (10dBA) on a noise level as compared with a conventional finger guard. The noise level is reduced by using a randomly arranged finger guard support member including a support member 8 of the finger guard shape A, a support member 10 of the shape B, a support member 12 of the shape C and a support member 16 of the shape D formed by an opposite method of a bend of a fan blade on a fan for which a finger guard is used. |
