Automatic temperature and humidity regulation – Furnace controlled – Furnace controlled responsive to combustion products...
Patent
1985-03-18
1986-04-29
Tanner, Harry
Automatic temperature and humidity regulation
Furnace controlled
Furnace controlled responsive to combustion products...
13710119, 431 12, F23N 100
Patent
active
045851611
ABSTRACT:
An air fuel ratio control system comprises a first valve provided in a fuel pipe through which a fuel is supplied to a burner, a second valve provided in an air pipe through which air is supplied to the burner, a varying circuit for varying responsive to a preset flow rate of fuel a valve opening degree of each of the first and second valves while maintaining a constant ratio between the valve opening degrees of the first and second valves, so that an air fuel ratio of a flow rate of fuel flowing through the first valve and a flow rate of air flowing through the second valve assumes a value greater than a theoretical air fuel ratio, a first sensor for detecting a flow rate of fuel flowing through the fuel pipe, a second sensor for detecting a flow rate of air flowing through the air pipe, a fuel bypass pipe provided in the fuel pipe for bypassing the first valve, a third valve provided in the fuel bypass pipe, and a control circuit supplied with output signals of the first and second sensors for controlling a valve opening ratio of the third valve, so that the air fuel ratio assumes a predetermined air fuel ratio.
REFERENCES:
patent: 3076605 (1963-02-01), Holden
patent: 3137341 (1964-06-01), Ruffing
patent: 3722811 (1973-03-01), Osburn
patent: 4406611 (1983-09-01), Michel
patent: 4421473 (1983-12-01), Londerville
Amemori Hiroyuki
Iwamoto Tetsuo
Kusama Akio
Miyata Yasuji
Nakamachi Ichiro
Tanner Harry
Tokico Ltd.
Tokyo Gas Company Ltd.
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