US 6,152,699 AGranted

Cooling apparatus for electrical equipment

AssigneeSansha Electric Manufacturing Company, Limited

InventorsKunio Shikata, Kunio Karino, Toshikatsu Okada

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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.

Claims2

Dependent claims

A cooling apparatus for electrical equipment having a component which generates heat when operating, said cooling apparatus comprising:

a fan for cooling said component;
a fan driving unit responsive to a forward-rotation command signal for rotating said fan in a forward direction such that air is drawn in through an air-intake aperture of the electrical equipment, flows over said component and flows out through an air-outlet aperture of the electrical equipment, said fan driving unit being also responsive to a reverse-rotation command signal for rotating said fan in a reverse direction opposite to said forward direction such that air is blown out through the air-intake aperture;
a first timer means for supplying the forward-rotation command signal to said fan driving unit during a first period and stopping providing the forward-rotation command signal in response to an expiration of said first period;
an indicator means responsive to the expiration of said first period for indicating the expiration of said first period and supplying said forward-rotation command signal to said fan driving unit, said indicator being also responsive to an indicator reset signal externally, manually applied thereto for stopping providing said forward-rotation command signal and developing a second timer enabling signal;
and
a second timer means for supplying the reverse-rotation command signal during a second period which starts from a time point when the second timer enabling signal is applied thereto, said second period being shorter than said first period.

3 more elements

Dependencies are inferred from the claim text.