Filter device

A filter device for purifying air, comprising:

• a filtering tank having a filter chamber for containing a predetermined volume of filtering solution to filter particles of said air and defining an upper air portion and a lower solution portion, an air inlet formed at said air portion for guiding said air to flow into said filter chamber and an air outlet for said air to exit from said filter chamber after said air passes through said filtering solution;
• a mixing rotor rotatably supported in said filtering tank, wherein said mixing rotor comprises a rotor hub driven to be rotated within said filter chamber and a plurality of air paddles spacedly and radially extended from said rotor hub for striking towards said filtering solution at said solution portion of said filter chamber for drawing said air to mix with said filtering solution, wherein said filtering solution is adapted to filter said air when said air is mixed with said filtering solution, wherein each of said air paddles, which has a zigzag cross section, has at least a solution cavity formed thereon and is arranged in such a manner that when each of said air paddles is rotated at said solution portion of said filtering tank, each of said air paddles is adapted for containing a portion of said filtering solution within said solution cavity for mixing said filtering solution with said air, wherein each of said air paddles has an outer end portion transversely extended therefrom to have a surface curvature substantially the same as a surface curvature of an inner surface of said filtering tank, wherein a radial diameter of said mixing rotor is slightly smaller than a radial diameter of said filtering tank so that when said mixing rotor is rotating, said filtering solution is guided and driven to fill in a gap between said outer end portion of said air paddle and said inner sidewall of said filtering tank for preventing air leakage via said gap;
• a filter housing, which has an air exit, a carbon filter compartment for receiving active carbon therein to filter said air discharged from said filtering tank so as to further purify said air before discharging at said air exit, and an air passageway communicatively extended from said air outlet of said filtering tank to said carbon filter compartment, wherein said air passageway has a zigzag shape for preventing said filtering solution entering into said carbon filter compartment when said air flows thereto, wherein said filtering tank is supported in said filter housing to communicate said carbon filter compartment with said air outlet of said filtering tank;
• and
• a guiding duct extended to said air inlet of said filtering tank for guiding said air to flow into said filtering tank, wherein an outlet diameter of said guiding duct is substantially smaller than an inlet diameter of said guiding duct such that said guiding duct is adapted for increasing a flow rate of said air flowing into said filtering tank towards said air paddles so as to propel said mixing rotor to rotate.