Multi-sweep blade with abrupt sweep transition

Details Multi-sweep blade with abrupt sweep transition Multi-sweep blade with abrupt sweep transition

1989-11-16

1991-11-12

Look, Edward K.

Fluid reaction surfaces (i.e., impellers)

Having clutch or brake means

416192, 416DIG5, F04D 2938

Patent

active

050643452

ABSTRACT:
A blade for a fan or blower which has an abrupt transition region between an inner blade region which has a negative leading edge sweep angle, and an outer blade region which is highly forwardly swept. The outer blade region is further characterized by a blade chord that increases with increasing radius. The fan provides a low pitch width and superior noise and efficiency trade-offs.

REFERENCES:
patent: 1146121 (1915-07-01), Amnelius
patent: 1825114 (1931-09-01), Hendrickson
patent: 2212041 (1940-08-01), Pfautsch
patent: 3826591 (1974-07-01), Wilson
patent: 3972646 (1976-08-01), Brown et al.
patent: 4358245 (1982-11-01), Gray
patent: 4459087 (1984-07-01), Barge
patent: 4505641 (1985-03-01), Tsuchikawa et al.
patent: 4569631 (1986-02-01), Gray
patent: 4569632 (1986-02-01), Gray
patent: 4684324 (1987-08-01), Perosino
patent: 4685513 (1987-08-01), Longhouse et al.
patent: 4729714 (1988-03-01), Wrobel
patent: 4840541 (1989-06-01), Sakane et al.

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