Stoves and furnaces – Liquid heater – Fluid fuel burner for other than top-accessible vessel
Patent
1994-05-27
1997-05-20
Price, Carl D.
Stoves and furnaces
Liquid heater
Fluid fuel burner for other than top-accessible vessel
431 90, 431 12, 431 18, 431 75, 431 80, F24H 110
Patent
active
056304080
ABSTRACT:
The invention relates to a gas/air ratio control apparatus for a temperature control loop for household gas appliances, in particular for domestic/direct hot water units and combined direct hot water/central heating units, for temperature control of domestic and/or heating water. The invention is particularly suitable for household appliances up to 120 KW. The gas/air ratio control apparatus comprises a controllable fan (3) for supplying a predetermined air stream (2-2) to a burner (4) in dependence on the detected actual temperature (T.sub.Actual) and the desired target temperature (T.sub.Target) of the heating and/or domestic hot water; and a pressure-controllable valve (8) for controlling the supply of a specified fuel quantity (1) to the burner (4) in dependency exclusively on the absolute pressure of the air stream (2-2) produced by the controllable fan (3). The inventive temperature control apparatus operates in an air/fuel regulating range of 20% to 100%, the controllable valve (8) supplying a fuel quantity (1) to the burner (4) having a pressure at a ratio of 1:1 to the absolute pressure of the air stream (2-2) produced by the controllable fan (3). The system uses only one pressure sensing line (11) and can always be brought into a safe condition when faults appear in the burner (4).
REFERENCES:
patent: 3299940 (1967-01-01), Phillips et al.
patent: 4104016 (1978-08-01), Baysinger
patent: 4436506 (1984-03-01), Berkhof
patent: 4913128 (1990-04-01), Adachi
EPO Search Report (No Date).
Translations of EPO Patent Appln. Nos. 0 108 349 and 0 450 173 A1 (No Date).
"SIT 828 Novamix" Product Brochure, SIT Group, pp. 1-8 (No Date).
"Gas-Air Ratio Control System for Optimum Boiler Efficiency" Publication, Honeywell Combustion Controls Center, pp. 1-4. (No date).
"Gas Air Ratio Module" Product Brochure, Honeywell Combustion Controls Center, pp. 1-6 (No Date).
Price Carl D.
Ranco Incorporated of Delaware
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