Browse Prior Art Database

Air Filter Clog Sensor

IP.com Disclosure Number: IPCOM000050814D
Original Publication Date: 1982-Dec-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 2 page(s) / 50K

Publishing Venue

IBM

Related People

Dunn, RM: AUTHOR [+3]

Abstract

Air-moving devices, such as blowers and fans, have air filters as assembly components. These air filters are necessary to provide clean air, devoid of dust and debris, to the air-moving devices which blow cooling air over electrical and electronic components within the equipment enclosure or housing. In use, dust accumulates on the air filters, inhibiting the air supply to machine components. Failure to replace dirty filters can cause electronic components to heat excessively and may result in total failure of expensive machine parts.

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Air Filter Clog Sensor

Air-moving devices, such as blowers and fans, have air filters as assembly components. These air filters are necessary to provide clean air, devoid of dust and debris, to the air-moving devices which blow cooling air over electrical and electronic components within the equipment enclosure or housing. In use, dust accumulates on the air filters, inhibiting the air supply to machine components. Failure to replace dirty filters can cause electronic components to heat excessively and may result in total failure of expensive machine parts.

Standard practice is to replace these filters on a periodic basis. Savings may be realized if the user is induced to replace the filter when necessary.

It is desirable to have a low cost sensor that will indicate to the equipment operator a clogged filter condition. This description suggests several different arrangements for doing so.

Fig. 1 shows a metal-coated or hollow metal ball 3 contained inside a plastic capsule 5. This capsule may be inserted in a filter 7, as shown in Fig. 2. The full lines show the normal position of ball 3. When the air flow through the air filter in the direction shown by the arrows is diminished due to clogging, more air will flow through the plastic capsule, causing the ball to ride up the ramp to the position shown by a dotted line. In this position, it will contact metal electrodes 9 and 11, connected to leads 13 and 15, thereby completing a circuit and signaling, electrically...