Centrifugal multiblade fan

Details Centrifugal multiblade fan Centrifugal multiblade fan

1997-05-16

1999-12-28

Verdier, Christopher

Fluid reaction surfaces (i.e., impellers)

Perimetric blading extending axially between annular members

416183, 416186R, 416187, 416223B, 416231B, F04D 2918

Patent

active

060073004

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.

REFERENCES:
patent: 45755 (1865-01-01), Sandford
patent: 2266180 (1941-12-01), Emerick
patent: 3140042 (1964-07-01), Fujii
patent: 3394876 (1968-07-01), Eck
Patent Abstracts of Japan, Matsushita Seiko Co., Ltd., vol. 010, No. 231, (M506), Aug. 12, 1986.

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