Centrifugal multiblade fan
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United States of America Patent
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Dec 28, 1999
Grant Date -
N/A
app pub date -
May 16, 1997
filing date -
May 17, 1996
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A centrifugal multiblade fan comprises a plurality of curved blades which are circularly arranged about a common rotation axis at evenly spaced intervals defining a curved air flow passage between every neighboring blades. Each curved blade has concave front and convex rear surfaces which extend longitudinally in parallel with the rotation axis. A lower annular end plate is provided for putting thereon lower ends of the circularly arranged blades. A radially outside part of each curved blade has a radius of curvature which is greater than that of a radially inside part of the blade. A slit extends longitudinally parallel with the rotation axis at a radially inside portion of each blade.
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