Apparatus and method for maintaining an operating condition for a blower
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United States of America Patent
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app pub date -
Aug 23, 2004
filing date -
Sep 3, 2003
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
An apparatus and method for maintaining a predetermined flow rate in a ventilation system having a motor driven blower. In one embodiment, the blower is a draft inducer. The apparatus contains a module for determining the impedance at the outlet of the blower. The impedance results from the length of pipe through which the blower blows the exhaust from a heating device, such as a hot water heater along with any obstructions. The impedance is determined by using a look-up table to compare the measured rotation rate (RPMs) of the motor shaft to values in the look-up table. The RPMs are measured by a sensor that is coupled to the rotating shaft of the motor. The sensor provides a sensor signal to the impedance module. Once a substantially matching value is found, the corresponding impedance is obtained from the look-up table. The impedance is then passed to a module for setting the motor speed. The motor speed module adjusts the speed of the motor based on the impedance to maintain a constant flow rate.
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