Abstract: In this article, the noise of three kinds water purifiers sold in local markets were choose to compare noise level. Furthermore, the mainstream water purifier of A company with new and used filter elements were also being studied. The results show that the noise of water purifier is composed of magnet valve with air in the system and the noise of stabilized pressure pump body. To solve this problem, programs optimization, structure noise-insulation and a new schema of noise intelligent detecting are presented.

Key words: Noise of water purifier, Flushing, Magnet valve, Stabilized pressure pump