Multi-air-duct structure and method for collecting and detecting food smell of refrigerating chamber of refrigerator

The invention provides a multi-air-duct structure and method for collecting and detecting food smell of a refrigerating chamber of a refrigerator. The multi-air-duct structure comprises an inner air duct and an outer air duct cover plate which are arranged in refrigerating equipment, wherein one end of the inner air duct communicates with a smell analysis chamber, and the other end of the inner air duct communicates with different parts of the refrigerating chamber of the refrigerator through N air outlets which are formed in the pipe wall of the inner air duct at intervals in the radial direction; the outer air duct cover plate is attached to the outer wall of the inner air duct; N air inlets matched with the air outlets are formed in the plate wall of the outer air duct cover plate in the radial direction; the air outlets are formed at a certain angle in the axial direction, or the air inlets are formed at a certain angle in the axial direction; and when the inner air duct rotates in the axial direction or