Patent ID: 7909903

Claim:
An air filter device, comprising: a main body ( 20 ) having a casing shape, and comprising: an air inlet port ( 22 ) formed in one side of the main body; an air outlet port ( 24 ) formed in an opposite side of the main body; and a guide ring ( 26 ) provided adjacent to an inner wall ( 20 a ) to have a predetermined height, with a hole ( 28 ) being formed in a predetermined portion of the guide ring in such a way as to directly communicate with the air outlet port ( 24 ); a cylindrical filter cartridge ( 30 ) accommodated in an inner space (S 3 ) of the guide ring ( 26 ) while an upper end of the filter cartridge is seated on an upper end of the guide ring ( 26 ) and a lower end of the filter cartridge is spaced apart from a bottom ( 20 b ) of the main body ( 20 ), with a filter material ( 34 ) being horizontally disposed in the filter cartridge; and a cap ( 40 ) fastened to an opening of the main body ( 20 ), and including a spacer ( 44 ) which compresses the upper end of the filter cartridge ( 30 ), wherein the air inlet port ( 22 ), a space (S 1 ) defined between the inner wall ( 20 a ) and the guide ring ( 26 ), an inner space (S 2 ) defined by the spacer ( 44 ), the inner space (S 3 ) defined in the guide ring ( 26 ), the hole ( 28 ), and the air outlet port ( 24 ) sequentially communicate with each other.