| 摘要 |
Sound attenuators used in ventilation, and in particular, for positioning adjacent ventilation fans that produce noise and vibration in such industrial areas as mines or factories. Known sound attenuators for such purposes are normally constructed of bulky and heavy material such as perforated metal and solid metal thereby tending to be easily dented and damaged and susceptible to corrosion. These attenuators also use sound absorbing material that if wetted renders the attenuator substantially useless wherein the attenuator must be replaced. Considering such problems as noted, a sound attenuator is provided suitable for use in reducing noise produced by axial flow fans used in industrial environs such as mines and factories. The sound attenuator comprising concentric inner and outer tubular members (10, 12) having sound absorbing material (14) positioned therebetween. The inner tubular member comprises a lattice (20) of reinforcing strand material (22) coated with solidified resin (24) wherein the strand material is formed in opposed generally helical patterns to provide the lattice. |
