횡류팬을 적용한 진공청소기 흡입노즐내 유동 소음 저감에 관한 연구

Reduction of Flow-Induced Noise in Suction Nozzle of a Vacuum Cleaner by Adopting a Cross-Flow Fan

In suction nozzle of a vacuum cleaner, where flow-induced noise is generated mainly by flow resistance, several ideas to reduce noise are investigated. To increase fan performance, blade number is optimized and a centrifugal fan is replaced by a cross-flow fan, In addition, gear ratio of fan to drum brush is changed. It is found that fan performance is increased by adopting these methods. Next, the blade height of the fan is decreased to reduce sound pressure level, which causes inevitably decrease in fan performance. Eventually, flow-induced noise is reduced by 6.3 dBA in its overall level with the fan performance maintained.