Patent ID: 7993421
Filing Date: 2011-08-09
Classification: B01D,F02M

Abstract:
1. A gas filtering apparatus comprising: a filter formed to be planar as a whole and including a plurality of folds extending parallel to each other; a pre-filtering chamber and a post-filtering chamber partitioned by the filter; an inlet port which is arranged in the pre-filtering chamber and which draws gas into the pre-filtering chamber; and an outlet port which is arranged in the post-filtering chamber and which discharges gas out of the post-filtering chamber, with the gas in the pre-filtering chamber being circulated to the post-filtering through the filter to filter the gas; wherein the pre-filtering chamber includes a diffusion zone located outward from an end of the filter in a folding direction of the filter and biased toward one side from the center of a filtering surface of the filter in a direction orthogonal to the folding direction of the filter; the inlet port extends in a direction orthogonal to the folding direction of the filter to a position corresponding to the end of the filter in the folding direction along a plane parallel to the filter, opens in the diffusion zone at the one side from the center of the filtering surface of the filter, and further opens toward the filter in the direction orthogonal to the folding direction of the filter; and the outlet port is located at a position biased toward the one side from the center of the filtering surface of the filter in the direction in which the inlet port extends.