Abstract: The heating process of boiling water cooker is accompanied by uncomfortable noise, especially when heating with high power. Reducing noise is the main research direction of boiling water cooker. By studying and analyzing the causes of noise in different stages of boiling water boiler, three main ways to reduce noise are put forward. How to reduce the bubble size and speed up the bubble separation are selected and studied. The relationship between the bubble size of noise and the shape, contact angle and surface roughness of heating surface is mainly calculated and analyzed. According to the research on the above factors related to the bubble, it is proposed to adopt the annular convex heating structure at the bottom of the cup body, and the test verifies the noise reduction effectiveness of this structure and the heating mask with small surface roughness during high-power heating. This structure has the characteristics of good production process, low cost and high heating efficiency, and has good interchangeability with the steel cup body of existing products.

Key words: Boiling water cooker, Noise, Convex structure