| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To form a blower impeller for air conditioning of two blades from the viewpoint of improvement in fan efficiency, and to reduce rotation noise generated by the blades. <P>SOLUTION: A mixed flow fan 1 is provided with a plurality of blades 2 on a substantially truncated cone-like hub 4, and the main blade 2 has two blades. An outer peripheral chord length of the main blade 2 is longer than a hub side chord length, a triangular blade 10 is provided in a form that a side of the triangle is abutted to an outer peripheral side front edge of the main blade 2, a radius of the blade is identical, an auxiliary blade 3 approximately in a fan shape and having two blades as a whole is provided between the main blades 2, a radial direction length L<SB>2</SB>of the auxiliary blade 3 is shorter than a radial direction length L<SB>1</SB>of the main blade 2, an outer peripheral side blade height H<SB>2</SB>of the auxiliary blade 3 is higher than a blade height H<SB>1</SB>of the main blade of the same circumference, and a rear edge 3a of the auxiliary blade 3 on the meridian plane is placed in the windward of a rear edge 6 of the main blade 2 on the meridian plane. <P>COPYRIGHT: (C)2006,JPO&NCIPI</p> |
