Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1994-12-21
1998-04-21
LaBalle, Clayton E.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 63, 416 44, 416135, H02K 904, H02K 906, B63H 300, B63H 106
Patent
active
057421072
ABSTRACT:
A rotary fan includes a rotatable base plate, a plurality of fan blades mounted rotatably on the base plate at a peripheral portion thereof by means of supporting studs, and a blade angle adjusting mechanism mounted in association with each of the fan blades for allowing the fan blade to rotate pivotally about the supporting stud under a centrifugal force acting on the fan blade such that the rate of increase of the air quantity produced by the fan blade decreases as a rotation number of the rotatable base plate increases within a predetermined high-speed rotation range of the rotatable base plate, while in other rotation speed range outside of the high-speed rotation range, the blade angle adjusting mechanism acts to suppress the rotation of the fan blade around the supporting stud. Noise generated by the rotary fan can significantly be reduced while ensuring a sufficient quantity of air flow.
REFERENCES:
patent: 2601495 (1952-06-01), Bell
patent: 2719000 (1955-09-01), Thevenaz
patent: 3358773 (1967-12-01), Oldberg
patent: 3373930 (1968-03-01), Rom
patent: 4464594 (1984-08-01), Matsumoto et al.
patent: 5118978 (1992-06-01), Matsumoto et al.
Adachi Katsumi
Asao Yoshihito
LaBalle Clayton E.
Mitsubishi Denki & Kabushiki Kaisha
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