| 摘要 |
PROBLEM TO BE SOLVED: To provide a multiblade blower that can improve blowing performance and lower noise by arranging multiple kinds of blades inside and outside. SOLUTION: Air flows along positive pressure surfaces 371c and negative pressure surfaces 371d of main blades 371 of an inner blade group 37 by the rotation of an impeller 32. When the air passes the inner blade group, the air flowing along the negative pressure surfaces 371d of the main blades 371 tends to separate from the negative pressure surfaces 371d, and shearing flows tend to be formed behind outer diameter end portions 371b of the main blades 371. Here, auxiliary blades 381 of an outer blade group are placed inside the air flows passing between the main blades 371 of the inner blade group, and therefore the auxiliary blades 381 restrain the separation of air flows and the shearing flows. COPYRIGHT: (C)2004,JPO
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