Fluid reaction surfaces (i.e. – impellers) – Specific blade structure – Irregular – flanged or channel forming blade surface
Patent
1978-11-21
1981-05-05
Powell, Jr., Everette A.
Fluid reaction surfaces (i.e., impellers)
Specific blade structure
Irregular, flanged or channel forming blade surface
416175, F04D 2938, F04D 2958
Patent
active
042655960
ABSTRACT:
An axial flow fan having auxiliary blades which includes a hub rotatably supported and driven by a drive source, a plurality of fan blades extending radially outwardly from the hub and at least one auxiliary blade projecting from an outer part on a suction and/or pressure surface of the fan blade and extending in the chord-length direction in such a manner that the leading region of the auxiliary blade is located nearer to the central axis of the fan than the trailing region thereof. A supplementary angle .theta..sub.0 of an angle formed between a chord line connecting to a leading edge and a trailing edge of the outer auxiliary blade and a reference line decided by the shape or operation of the fan blade has the relation; 5.degree..ltoreq..theta..sub.0 .ltoreq.40.degree.. A supplementary angle .theta..sub.N of an angle formed between a chord line connecting to a leading edge and a trailing edge of the inner auxiliary blade and a reference line decided by the shape or operation of the fan blade also has the relation; 18.degree..ltoreq..theta..sub.n .ltoreq.50.degree.. The axial flow fan serves to produce a strong radial flow by auxiliary blades of the optimum positional relation as described and improves the aerodynamic performances of the fan such as the air flow rate, efficiency and noise level.
REFERENCES:
patent: 1066988 (1913-07-01), Boutwell
patent: 1834888 (1931-12-01), Baughn
patent: 2010094 (1935-08-01), Leinweber
patent: 3193185 (1965-07-01), Erwin et al.
patent: 4108573 (1978-08-01), Wagner
patent: 4128363 (1978-12-01), Fujikake et al.
Fujikake Kenji
Katagiri Haruo
Yamada Katsuhito
Kabushiki Kaisha Toyota Chuo Kenkyusho
Powell Jr. Everette A.
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