Furnaces – Draft regulators – Fan exhaust
Patent
1995-06-09
1996-06-11
Macy, Marguerite
Furnaces
Draft regulators
Fan exhaust
110185, 110159, 236 491, G05D 706
Patent
active
055245560
ABSTRACT:
A gas fired furnace system (10) has a controller (14) controlling the supply of gas through a gas valve (12) and air for combustion by means of an induced air draft fan (28), ignition of the gas by means of ignitor (22), the delivery of heated air from a heat exchanger (20) by means of an air blower (34) in response to signals from a thermostat (42). A selected constant flow of air for combustion is provided by controlling the speed of the motor driving the induced motor fan (28) despite changes which may occur in back pressure. Induced draft fan motor parameters proportional to motor torque and motor speed are read on an ongoing basis and inputted to controller (14) which computes a desired voltage and compares that with referenced data stored in the controller memory and makes corrections to the speed of the induced draft fan motor to maintain the constant air flow. The motor speed and motor torque are also monitored to ensure that they are within selected limits indicative of safe operation and responsive to this input energization of a relay (KM1) is controlled to deenergize the gas valve and ignition.
REFERENCES:
patent: 3924605 (1975-12-01), Weinman et al.
patent: 4185685 (1980-01-01), Giberson
patent: 4204832 (1980-05-01), Miller
patent: 4205631 (1980-06-01), Parker
patent: 4402303 (1983-09-01), Koenneman
patent: 4485746 (1984-12-01), Erlandsson
patent: 4487137 (1984-12-01), Horvat et al.
patent: 4638233 (1987-01-01), Erdman
patent: 4648551 (1987-03-01), Thompson et al.
patent: 4688547 (1987-08-01), Ballard et al.
patent: 4703747 (1987-11-01), Thompson et al.
patent: 4789330 (1988-12-01), Ballard et al.
patent: 4829703 (1989-05-01), Watson et al.
patent: 4860231 (1989-08-01), Ballard et al.
patent: 4907737 (1990-03-01), Williams
patent: 5272427 (1993-12-01), Nold et al.
patent: 5279234 (1994-01-01), Bender et al.
patent: 5331944 (1994-07-01), Kujawa et al.
Article Entitled: Controlling A DC Motor With A Low-End Micro-Controller By J. Nicolai & T. Castagnet (Intelligent Motion--Jun. 1993 Proceedings).
Bailey Walter H.
Garnett Ronald E.
Rowlette Mitchell R.
Ting Youn H.
Baumann Russell E.
Donaldson Richard L.
Grossman Rene E.
Macy Marguerite
Texas Instruments Incorporated
LandOfFree
Induced draft fan control for use with gas furnaces does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Induced draft fan control for use with gas furnaces, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Induced draft fan control for use with gas furnaces will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-346851