Fan having forward-curved blades

Details Fan having forward-curved blades Fan having forward-curved blades

1977-08-16

1979-08-28

Powell, Jr., Everette A.

Fluid reaction surfaces (i.e., impellers)

Perimetric blading extending axially between annular members

416187, F04D 2930

Patent

active

041659503

ABSTRACT:
A fan having forward-curved blades, such as a sirrocco fan or cross-flow fan, wherein the width of the outlet of an air passage between the adjacent two blades is 0.28 to 0.52 of the pitch of the blades at the inlet of the air passage, and the width of the inlet of the air passage is 0.85 to 1.2 of the width of the outlet thereof. The fan having blades of this construction has improved efficiency and reduced aerodynamic noise level in operation.

REFERENCES:
patent: RE18485 (1932-05-01), Lysholm
patent: 1749528 (1930-03-01), Freudenreich et al.
patent: 2138814 (1938-12-01), Bressler
patent: 2329696 (1943-09-01), Chester
patent: 3140042 (1964-07-01), Fujii
patent: 3394876 (1968-07-01), Eck

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