Browse Prior Art Database

Air Filter Clogging Alarm with Automatic System Shutdown

IP.com Disclosure Number: IPCOM000114201D
Original Publication Date: 1994-Nov-01
Included in the Prior Art Database: 2005-Mar-27
Document File: 4 page(s) / 83K

Publishing Venue

IBM

Related People

Rachui, R: AUTHOR [+2]

Abstract

This disclosure describes a method of sensing filter clogging and fan failure that will solve this problem. This is done by installing two air velocity switches that are calibrated to sense a change of air velocity at 80% (1) and 90% (2) filter clogging. The two switches are side by side and located in front of the fan (9) as shown in Figs. 1 and 2. The 80% switch (1) triggers an audio alarm (3) to alert the operator that the filter is clogged and that it needs to be replaced. If this warning is neglected and 90% of the filter clogs, the 90% switch (2) will perform an automatic power shutdown to prevent the system from overheating and avoid costly repairs. If the fan should happen to fail, both the 80% and 90% switches will be activated initiating an automatic power shutdown.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 55% of the total text.

Air Filter Clogging Alarm with Automatic System Shutdown

      This disclosure describes a method of sensing filter clogging
and fan failure that will solve this problem.  This is done by
installing two air velocity switches that are calibrated to sense a
change of air velocity at 80% (1) and 90% (2) filter clogging.  The
two switches are side by side and located in front of the fan (9) as
shown in Figs. 1 and 2.  The 80% switch (1) triggers an audio alarm
(3) to alert the operator that the filter is clogged and that it
needs to be replaced.  If this warning is neglected and 90% of the
filter clogs, the 90% switch (2) will perform an automatic power
shutdown to prevent the system from overheating and avoid costly
repairs.  If the fan should happen to fail, both the 80% and 90%
switches will be activated initiating an automatic power shutdown.

      The sensors are strategically located at the lower left hand
corner of the enclosure.  This location is critical because it is
insensitive to how or where the clogging takes place.  This is an
enhancement since one cannot predict where or how the filter will
clog.  Other locations tested were proven to be clogging location
sensitive.

      Orientation of the switches is also critical.  Repeatable
switch orientation is accomplished by a bracket (4) design that holds
and orients the two switches by way of an extrusion (5) that
interlocks with an adjustment screw (6) cavity available in the
switch.  The audio...