초록 ▼

An axial flow fan having auxiliary blades comprises a hub member rotatably supported and driven by a drive source, a plurality of main blades having a predetermined angle with respect to the rotational direction thereof and a predetermined width and height, the main blades being radially provided on

An axial flow fan having auxiliary blades comprises a hub member rotatably supported and driven by a drive source, a plurality of main blades having a predetermined angle with respect to the rotational direction thereof and a predetermined width and height, the main blades being radially provided on the hub member, at least one auxiliary blade formed on at least one of a suction surface and a pressure surface of each main fan blade and having a predetermined length in the width direction of the main fan blade, a leading edge of the auxiliary blade being positioned closer to the axis of the main fan blade than a trailing edge of the auxiliary blade, a shroud comprising a thin hollow member having a large opening and a small throttled opening at opposite ends thereof, and the main fan blade being inserted within the shroud from the small throttled opening toward the large opening of the shroud. An axial inserted width L of the main fan blade, which is defined by a point of minimum opening of the small throttled opening and an inserted end portion of the inserted main fan blade in the axial direction, and an axial entire width W of the main fan blade are maintained in the following relation: 0≤L≤W.

대표청구항 ▼

An axial flow fan having auxiliary blades comprising: a hub member rotatably supported and driven by a drive source; a plurality of main blades having a predetermined angle with respect to the rotational direction thereof and a predetermined width and height, said blades being radially provided on s

An axial flow fan having auxiliary blades comprising: a hub member rotatably supported and driven by a drive source; a plurality of main blades having a predetermined angle with respect to the rotational direction thereof and a predetermined width and height, said blades being radially provided on said hub member; at least one auxiliary blade formed on at least one of a suction surface and a pressure surface of each of said main fan blades and having a predetermined length in a width of said main fan blades, a leading edge of each of said auxiliary blades being positioned closer to the axis of rotation of the respective one of said main fan blades than a trailing edge thereof; and a shroud comprising a thin hollow member having a large opening and a small throttled opening at opposite ends thereof, said fan blade being inserted within said shroud from said small throttled opening toward said large opening of said shroud, and an axial inserted width L of said main fan blade, which is defined by a point of minimum opening of said small throttled opening and an inserted end portion of said inserted fan blade in the axial direction, and an axial entire width W of said fan blade being maintained in the following relation 0≤L≤W.