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1. (WO1991007593) MULTI-SWEEP BLADE WITH ABRUPT SWEEP TRANSITION
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1991/007593 International Application No.: PCT/US1990/006743
Publication Date: 30.05.1991 International Filing Date: 16.11.1990
Chapter 2 Demand Filed: 17.06.1991
IPC:
F04D 29/38 (2006.01)
F MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
04
POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
D
NON-POSITIVE-DISPLACEMENT PUMPS
29
Details, component parts, or accessories
26
Rotors specially adapted for elastic fluids
32
for axial-flow pumps
38
Blades
Applicants:
AIRFLOW RESEARCH AND MANUFACTURING CORPORATION [US/US]; 304 Pleasant Street Watertown, MA 02172, US
Inventors:
KIMBALL, Richard; US
Agent:
FRENCH, Timothy, A.; Fish & Richardson 225 Franklin Street Boston, MA 02110-2804, US
Priority Data:
438,77416.11.1989US
Title (EN) MULTI-SWEEP BLADE WITH ABRUPT SWEEP TRANSITION
(FR) PALE A COURBURES MULTIPLES A TRANSITION ABRUPTE ENTRE LES COURBURES
Abstract:
(EN) A blade (14) for a fan or blower (10) 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.
(FR) Une pale (14) pour un ventilateur ou souffleur (10) comprend une région de transition abrupte entre une zone intérieure de la pale qui a un bord d'attaque qui forme un angle négatif de courbure et une zone extérieure de la pale qui a une courbure marquée en avant. La région extérieure de la pale se caractérise en outre par une corde qui augmente à mesure que le rayon augmente. Le ventilateur a un pas de largeur réduite, de même que des avantages importants en ce qui concerne le bruit et l'efficacité.
Designated States: JP
European Patent Office (AT, BE, CH, DE, DK, ES, FR, GB, GR, IT, LU, NL, SE)
Publication Language: English (EN)
Filing Language: English (EN)
Also published as:
EP0500782