Accurate control system for domestic gas cooker burner, comprises electronically controlled geared electric motor rotating gas tap to position imposed by user's manual setting control
Parallel plates (15,16), mounted in the cooker hob or casing, support the motor (4) and house the gear-train (6,7,8,9), giving typically 100:1 reduction, whose input wheel (6) is fixed on the motor drive-shaft, the output wheel (9) being fixed on the spindle (5) of the gas tap (1). The spindle is al...
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Zusammenfassung: | Parallel plates (15,16), mounted in the cooker hob or casing, support the motor (4) and house the gear-train (6,7,8,9), giving typically 100:1 reduction, whose input wheel (6) is fixed on the motor drive-shaft, the output wheel (9) being fixed on the spindle (5) of the gas tap (1). The spindle is aligned with and fixed to the operating shaft (11) of a potentiometer (10), also supported by the gear-train frame, whose output accurately represents the angular position of the tap. This output and a setting for the tap opening imposed by the user through a manually operated device (13), e.g. a knob or a capacitance effect touch control, are input to a comparator (12). The error signal (E) is processed by an electronic control unit (14) which operates so as to reduce the signal to zero, to this end driving the motor via a power interface based e.g. on an amplifier and transistor or thyristor. The reversible, typically DC, motor requires only a 20 g.cm torque rating. Using electronic type user controls, digital circuitry can be employed. Automatic gas shut-off, initiated by a flame-out detector on the burner, can be incorporated as a safety measure.
La présente invention concerne un dispositif de commande d'un brûleur à gaz.Le dispositif comporte un robinet à gaz (1), connecté en amont à un circuit d'arrivée de gaz et fournissant en aval le gaz au brûleur, un moteur (4) d'entraînement en rotation de l'axe d'ouverture du robinet, des moyens (10, 11) de mesure de la position angulaire de l'axe d'ouverture (5) du robinet, l'ouverture et la fermeture de ce dernier étant fonction de cette position angulaire, et des moyens d'asservissement (12, 14) de la position angulaire de l'axe d'ouverture (5) du robinet qui agissent sur la commande du moteur (4). L'asservissement est fonction d'une information fournie par des moyens de consigne (13) et de la mesure fournie par les moyens de mesure de position angulaire.L'invention s'applique notamment pour des appareils de cuisson à gaz domestique. |
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