| 摘要 |
PURPOSE:To improve compression efficiency over the entire operating range by supplying an impeller with uniform vortex air flow using a plurality of variable angle air guide vanes spaced at regular circumferential intervals upstream of the inlet of a compression impeller. CONSTITUTION:Air introduced from air inlet 11A of duct 11 is led to a scroll section 11B and through annular air passage 11C to air inlet 5B. Guide vanes 12 installed in annular air passage 11C are arranged at regular circumferential intervals. The guide vanes 12 can be swung simultaneously through link mechanism 15A when angle changing member 15 is turned about supporting shaft 16. At low speeds on with low loads, air passage are throttled with the vanes. |
