Pumps – Motor driven – Including means utilizing pump fluid for augmenting cooling,...
Patent
1993-01-26
1994-09-27
Bertsch, Richard A.
Pumps
Motor driven
Including means utilizing pump fluid for augmenting cooling,...
417369, 4174238, 415144, F04B 3906
Patent
active
053502817
ABSTRACT:
A motor driven fan capable of operating continuously in a dead-headed mode resulting from complete blockage of airflow from an outlet of the fan is provided. The fan includes a housing defining both a primary passage for directing a flow of air from an inlet to an outlet of the fan, and a secondary passage for directing a flow of air between the inlet of the fan and ambient air surrounding the housing opposite the primary passage. The secondary passage includes a motor compartment having an inlet passage in fluid communication with the primary passage and an outlet passage in fluid communication with the ambient air surrounding the housing. Impeller means, mounted within the housing, provide the flows of air in the primary and secondary passages. A motor, mounted within the motor compartment and operatively connected to drive the impeller means is continuously cooled by the flow of air through the secondary passage even when the flow of air through the primary passage is reduced to zero by a complete blockage of the outlet of the fan.
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Bertsch Richard A.
Crowe Lawrence E.
Korytnyk Peter
Sundstrand Corporation
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