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The detector is insensitive to all undesirable quantities such as variations in ambient air temperature and supply voltage, while reliably sensing blower operation status.
English (United States)
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Blower Failure Detection Using Pneumo-Optical Device
The detector is insensitive to all undesirable quantities such as variations in
ambient air temperature and supply voltage, while reliably sensing blower
Large air moving devices, such as used for cooling today's computers,
usually employ one or more active thermal switches to sense air moving device
failure. The thermal switches are often of the heated variety which are designed
to respond primarily to large variations in the air flow, i.e., failure of an air moving
device. However, in addition to sensing quantum air flow changes, the switch
assembly, by virtue of its design, is, unfortunately, also sensitive to such
undesirable quantities as heater terminal voltage and ambient air temperature
changes as well.
The arrangement described below provides a means for detecting air moving
device failure which is completely insensitive to the two undesirable quantities
mentioned above. The arrangement takes advantage of a differential pressure,
consisting of a positive component at the discharge opening of a blower scroll
and a negative component at the inlet opening, which exists so long as the
blower is operational. These components have the property that, when their
locations within the scroll are properly selected, both will increase positively at
approximately the same rate with increasing blower load such that the total
differential pressure remains essentially constant over the range of air f...