Fluid reaction surfaces (i.e. – impellers) – Specific blade structure – Tined or irregular periphery
Patent
1995-11-08
1997-02-18
Look, Edward K.
Fluid reaction surfaces (i.e., impellers)
Specific blade structure
Tined or irregular periphery
416236R, 415119, F04D 2938
Patent
active
056036078
ABSTRACT:
The present invention provides a propeller fan having a blade trailing edge of a sawtooth shape, in which the flows on the negative pressure side and the pressure side of a blade join gradually, so that the velocity loss is decreased in the vicinity of the trailing edge. As a result, the velocity gradient decreases and the generation of turbulence is reduced as compared with the conventional propeller fan, so that the noise is reduced and the fan efficiency is enhanced.
REFERENCES:
patent: 4089618 (1978-05-01), Patel
patent: 4318669 (1982-03-01), Wennerstrom
patent: 4441857 (1984-04-01), Jackson et al.
patent: 4640668 (1987-02-01), Yang
Hayashi Masateru
Ito Akihiro
Kondo Fumio
Taniguchi Masami
Look Edward K.
Mitsubishi Jukogyo Kabushiki Kaisha
Verdier Christopher
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