Abstract: The problem of secondary pollution caused by dirt and bacteria between the inner and outer cylinders of washing machines has always been a pain point for the industry and users. Starting from the application background of the technology of no hole inner cylinder, this paper comprehensively introduces the key technologies such as water inlet mode, drainage mode, air pressure balance, positioning detection, etc. in the pollution-free washing machine, and summarizes and analyzes them, so as to provide reference for the development of the healthy pollution-free technology of the washing machine.

Key words: Inner drum without hole, Secondary pollution, Healthy and pollution free