Gas oven fuel control with proof of ignition

F - Mech Eng,Light,Heat,Weapons – 24 – C

Patent

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Details

F24C 3/12 (2006.01) F23N 5/20 (2006.01) F23N 5/24 (2006.01) F23N 5/02 (2006.01) F23N 5/10 (2006.01) F23N 5/14 (2006.01)

Patent

CA 2218968

A gas oven having an electronic controller for directly controlling the gas valve and burner ignition. The controller opens the gas valve and activates the ignitor whenever oven heating is required and then determines whether ignition has occurred, detected by an indicator of ignition, often a conventional oven thermostat, a thermocouple, a resistance temperature device (RTD), or other type of temperature sensor. Positive proof of ignition is given by determining whether the detected temperature is increasing at a particular rate. The gas valve is closed if ignition does not occur within a predetermined time, preferably about 10-15 seconds. Re-ignition may be attempted after a sufficient delay. The controller also closes the gas valve whenever the oven temperature is decreasing at a predetermined rate or is increasing at less than a predetermined rate.

L'invention porte sur un four au gaz équipé d'un contrôleur électronique qui contrôle directement la soupape de gaz et l'allumage du brûleur. Le contrôleur ouvre la soupape de gaz et active l'allumeur chaque fois que l'utilisation du four est nécessaire, puis il détermine si l'allumage a eu lieu. Pour ce faire, il utilise un indicateur d'allumage, souvent un thermostat classique de four, un thermocouple, un détecteur de température à résistance (RTD) ou un autre type de capteur de température. Une preuve positive de l'allumage est obtenue en déterminant si la température détectée augmente à un taux particulier. La soupape de gaz est fermée si l'allumage ne s'est pas produit dans un délai prédéterminé, de préférente entre 10 à 15 secondes. Après un délai suffisant, on peut essayer d'allumer de nouveau le four. Le contrôleur ferme également la soupape de gaz lorsque la température du four diminue à un taux prédéterminé ou augmente en deçà d'un taux prédéterminé.

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