Fluid reaction surfaces (i.e. – impellers) – Specific blade structure – Radial flow devices
Patent
1988-03-11
1989-06-20
Garrett, Robert E.
Fluid reaction surfaces (i.e., impellers)
Specific blade structure
Radial flow devices
415119, 416DIG2, F04D 2938
Patent
active
048405418
ABSTRACT:
A fan apparatus for preventing the occurrence of a burble on a surface of a blade while the resistance to air flow into the fan is increased and the generated noise is kept small. Each fan of the blade has a first area which extends from the bottom portion of the blade to the intermediate portion and a second area from the intermediate portion of the blade to the top portion of the blade. The setting angle of the blade is a first, predetermined angle at the first area of the blade but is increased at the second area of the blade. Further, the chord length of the blade gradually increases from the bottom to the top of the blade. Additionally, a first wing axis of the blade in the first area is not parallel to a second wing axis of the blade at the second area but, rather, the second wing axis is inclined towards the rotational direction of the fan apparatus. Finally, the profile of the blade of the invention is formed so that the profile at the first area is perpendicular to the first wing axis and the profile at the second area is perpendicular to the second wing axis. With such a structure, a pressure distribution along the wing chord is substantially the same at the first area and the pressure distribution along the wing chord at the second area is gradually increased so that the shape of the pressure distribution is similar to that of the first area.
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Sakane Takaaki
Takeuchi Kazuhiro
Garrett Robert E.
Kwon John T.
Nippondenso Co. Ltd.
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