| 摘要 |
<P>PROBLEM TO BE SOLVED: To ensure a smooth rectifying function in a ventilation passage A of a highway tunnel, and also to improve a sound absorbing function in the same. <P>SOLUTION: There is provided a rectifier with the sound absorbing function, which is arranged at a bent area B of the ventilation passage A of the highway tunnel. The entire length of the bent area is divided into a plurality of parallel ducts C<SB>1</SB>to C<SB>8</SB>having the same flowage area. The dividing work is carried out by fitting rectifying units 10 each having the sound absorbing function, to thereby impart the sound absorbing function to an inner surface of each duct. By virtue of guide of airflow over the entire length of the bent area, the degree of bending can be eased, and therefore pressure loss at the bent area is relatively small. Further by dividing the single ventilation passage into the plurality of ducts and arranging a sound absorbing material on each divided duct inner surface, a sound absorbing surface with which sound makes contact is expanded, to thereby further improve sound absorbing effect. Accordingly the load imposed on a ventilation blower can be reduced, and a quiet ventilation passage is implemented. <P>COPYRIGHT: (C)2007,JPO&INPIT |
