Filter assembly, vacuum cleaner and cleaning set

A filter assembly, comprising a cyclone separator for primary filtration and a high efficiency particulate air filter (HEPA) assembly for secondary filtration arranged in the cyclone separator;

• wherein,
• the cyclone separator comprises a filter support and a filter screen arranged on the filter support,
• an air guide structure is formed on a side wall of a first end of the filter support, wherein the air guide structure protrudes outwards in a radial direction and spirally extends towards one side of the filter screen, and first air outlet holes are formed in the air guide structure;
• the HEPA assembly comprises a HEPA support and a HEPA body, the HEPA support is fixed at the first end of the filter support provided with the first air outlet holes and second air outlet holes are formed in the HEPA support, the HEPA body is arranged on the HEPA support and comprises folds, and an airflow circulation channel in an axis direction of the cyclone separator is formed between any two adjacent folds;
• and
• the filter assembly has a dust suction state and a dust blowing state when being used in a vacuum cleaner,
• in the dust suction state, a second end of the filter support is closed, and an airflow forms a spiral airflow along an outer contour of the air guide structure, enters the filter support after primary filtration through the filter screen, and is discharged from a top opening of the HEPA body along the airflow circulation channel after the secondary filtration by the HEPA assembly;
• and
• in the dust blowing state, the airflow enters the filter support from the second air outlet holes, a part of the airflow blows into a space between an outer wall of the filter screen and an inner wall of a dust cup body of the vacuum cleaner through the first air outlet holes, the rest of the airflow blows into a space between an inner wall of the filter support and an outer wall of the HEPA body, thus realizing self-cleaning of the cyclone separator, the HEPA assembly and a dust cup.