Cyclone is widely adopted in the vacuum cleaner and replace the dust bag effectively, because of it's simple structure, high dust collection efficiency and its transparency feature which can be shown to the customer. Usually cyclone performance is represented by collection efficiency, flow rate, pressure drop etc. and developed to satisfy these index only. At recent times the noise problem is getting important as cyclone comes into home-appliances. The major noise sources of vacuum cleaner are not only the centrifugal fan but also the cyclone itself. In this paper, the aeroacoustic characteristics and noise reduction method of a cyclone for a bagless vacuum cleaner were presented. Cyclone's pressure drop and noise is measured at the variation of the cyclone structure and the main peak noise sources of a cyclone is found by experiments and numerical analysis. In addition, the structures for peak noise reduction were suggested for a various cyclones and these were beneficial both pressure drop and noise reduction. Result of our study shows significant reduction, the peak SPL is reduced about 15 dBA. The bagless vacuum cleaner with a noise reduction structure has lower noise level than that of the previous one and the strong tonal sound was dramatically reduced.
展开▼
