| 摘要 |
PROBLEM TO BE SOLVED: To provide a filter device capable of removing fine particles contained in an exhaust gas, the particles having larger particle size to smaller particle size, in proportion to a speed of the exhaust gas.SOLUTION: The filter device includes: a casing 2 having an inlet 6 and an outlet 8; a diaphragm 3 arranged in the casing 2 so as to have a plurality of spiral parts to form a spiral flow path 11; and a filter member 4 arranged on at least one surface of the diaphragm 3, wherein the flow path width (A) of the spiral part 3a located on the outermost side of the spiral flow path 11 is made wider than the flow path width (B) of the spiral part 3b located on the inner side than the outermost side of the spiral flow path 11, and the fine particles contained in the exhaust gas are made to have a larger linear speed on the spiral part located on the inner side than on the spiral part located on the outer side of the spiral flow path. |
