Pumps – Condition responsive control of pump drive motor – Having timer or delay means
Patent
1997-12-01
2000-11-28
Thorpe, Timothy S.
Pumps
Condition responsive control of pump drive motor
Having timer or delay means
417326, 4174231, F04B 4900
Patent
active
061526991
ABSTRACT:
A cooling apparatus for electrical equipment having heat-generating components, air-intake apertures and air-outlet apertures includes a fan, a forward-rotation power control circuit, a reverse-rotation power control circuit, an indicator, a long-term timer and a short-term timer. The forward-rotation power control circuit rotates the fan in a forward direction such that air flows in through the air-intake apertures, over the heat-generating components and away through the air-outlet apertures, in response to a forward-rotation command signal. The reverse-rotation power control circuit rotates the fan in the opposite direction. The long-term timer continuously applies the forward-rotation command signal to the forward-rotation power control circuit during a first predetermined period. The indicator indicates the expiration of the first predetermined period. When the indicator is reset, the short-term timer is enabled to continuously apply the reverse-rotation command signal to the reverse-rotation power control circuit during a second predetermined period shorter than the first predetermined period.
REFERENCES:
patent: 4742430 (1988-05-01), Sawato et al.
patent: 5001463 (1991-03-01), Hamburger
patent: 5750971 (1998-05-01), Taylor
Derwent Abstract Accession No. 94-187497/23, and JP 6-125187, Hitachi Ltd.
Karino Kunio
Okada Toshikatsu
Shikata Kunio
Sansha Electric Manufacturing Company Limited
Thorpe Timothy S.
Tyler Cheryl J.
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