Cyclone and dust filter vacuum cleaner

A method of filtering dust utilizing two dust removal chambers, comprising the steps of:

• drawing air containing fine and coarse dust into a first dust chamber having a cylinder and a filtering tube disposed within the cylinder, the drawn air containing fine and coarse dust being supplied into a gap disposed between an inner surface of the cylinder and an outer surface of the filtering tube;
• rotating the drawn air containing fine and coarse dust in the first dust chamber to cause the coarse dust to travel outwardly away from the filtering tube and to cause the drawn air and at least some of the fine dust to travel inwardly towards and into the filtering tube;
• supplying the air and fine dust within the filtering tube to a second dust chamber having a funnel-shaped cone, the air and fine dust being supplied within the funnel-shaped cone;
• rotating the air and fine dust within the funnel-shaped cone to cause the fine dust to travel outwardly towards an inner surface of the funnel-shaped cone and to cause the air to travel at a center of the funnel-shaped cone;
• supplying the air travelling at the center of the funnel-shaped cone outside the second dust chamber as filtered air.

A method of filtering dust, comprising the steps of:

• supplying air having dust tangentially along an inside of a funnel-shaped cone;
• rotating the air and dust within the cone to cause the dust to travel outwardly towards an inner surface of the cone and to cause air substantially without dust to travel along a center axis of the cone;
• deflecting the air travelling along the center axis of the cone by a deflecting structure in the form of a cylindrical boss disposed at a center of one end of the cone;
• supplying the deflected air outside the cone as filtered air;
• allowing dust travelling along the inner surface of the cone to pass through a gap disposed between the deflecting structure and the surface of the cone;
• and
• preventing by the cylindrical boss re-entry of dust into the cone that previously passed out of the cone through the gap.

A vacuum cleaner, comprising:

• a vacuum cleaner housing having an inlet for dirty air and an outlet for clean air, said housing having first and second chambers, said first chamber being a coarse dust removal chamber and said second chamber being a fine dust removal chamber;
• a rotary cylinder disposed in an upper part of the coarse dust removal chamber;
• a filtering tube having a cylindrical sidewall disposed within said rotary cylinder, the inlet of said container being disposed above the coarse dust chamber, and at least a portion of the inlet being disposed between said rotary cylinder and said filtering tube;
• a spiral guide blade disposed around an upper part of the filtering tube and adapted to cause air disposed within the rotary cylinder to rotate;
• and
• a guide duct extending from an upper part of said filtering tube to an upper part of said fine dust removal chamber.