CYCLONE SEPARATION DEVICE

To provide a cyclone separation device that reduces pressure loss in generating a swirl airflow.SOLUTION: A cyclone separation device (ventilation port hood) comprises a plurality of fixed blades 8 for generating a swirl airflow in a housing using air flowing in from an inflow port. The plurality of fixed blades 8 respectively has: a straight shape part 81 of a prescribed thickness, which includes an end 83 of a downstream side and an end 85 on an upstream side, and which is arranged by being inclined to a prescribed angle (angle D1) relative to a straight line L1 connecting a central axis 6 and a midpoint of the end 83 of the downstream side, in a cross-sectional shape of the fixed blade 8 according to a plane view with the central axis 6 of a swirl chamber as the normal line; and a curved shape part 82 which is provided by extending to the upstream side from the straight shape part 81, and in which the end 85 of the upstream side is curved to an external surface S1 side of the fixed blade 8 beyond the straight shape part 81. The plurality of fixed blades 8 are arranged at a prescribed interval along the circumference of a cylinder (cylinder surface A1) with the central axis 6 of the swirl chamber as its center.SELECTED DRAWING: Figure 5 【課題】旋回気流を生じさせる際の圧力損失を低減することが可能なサイクロン分離装置を提供する。【解決手段】サイクロン分離装置（換気口フード）は、流入口から流入する空気によって筐体内に旋回気流を発生させる複数の固定羽根８を備える。複数の固定羽根８のそれぞれは、下流側の端部８３と上流側の端部８５を有しており、旋回室の中心軸６を法線とする平面による固定羽根８の断面形状において、中心軸６と下流側の端部８３の中点とを結ぶ直線Ｌ１に対して所定の角度（角度Ｄ１）に傾斜させて配置された所定の厚みの直線形状部８１と、直線形状部８１から上流側に延伸して設けられ、上流側の端部８５が直線形状部８１よりも固定羽根８の外面Ｓ１側に湾曲している湾曲形状部８２とを有して構成される。複数の固定羽根８は、旋回室の中心軸６を中心とする円筒（円筒面Ａ１）の円周に沿って所定の間隔を空けて配置されている。【選択図】図５