Fan

Abstract

Abstract PURPOSE:To raise the static pressure efficiency of a fan, by employing such an arrangement that centripetal acceleration is caused at the front half of a blade and axial-flow or mixed-flow acceleration is caused at the rear-half of the blade so that a high static pressure can be obtained without stator blades. CONSTITUTION:Blades 3 are fixed to the outer circumferential surface of a hub 2 of an impeller 1 whose surface is shaped substantially in hyperboloid of one sheet, and the part of the leading edge 3a of the blade 3 located on the tip side 3a1 is tilted to extend in more parallel to the fluid flow than the part of the leading edge 3a located on the hub side 3a2. The outer circumferential surface of the hub 2 is composed of a front curved surface 6a where centripetal acceleration directed obliquely toward the inside is produced and a rear curved surface 6b where axial-flow acceleration in the axial direction or mixed-flow acceleration directed obliquely toward the outside is produced. Thus, since the centripetal acceleration is produced at the front half of the blade and the axial-flow acceleration or mixed-flow acceleration is produced at the rear half of the blade, a high static pressure can be obtained without stator blades. Therefore, it is enabled to increase the chord length of the blade, to make a fluid flow through fluid passages between the blades substantially at a uniform speed, to reduce the internal loss of a fan and to raise the static pressure efficiency.

Inventors

• 👤 Kanjiro Kinoshita
• 👤 歓治郎 木下

Bibliographic Details