초록 ▼

The system (1) for controlling the combustion ( 7) of a cooking oven burner (2), comprises in combination a thermostat valve (3) with a rotary hand knob (4) and a non-electric temperature sensor (6) for modulating the burner flame (7), and an electromagnetic safety valve kept open for ignition, and

The system (1) for controlling the combustion ( 7) of a cooking oven burner (2), comprises in combination a thermostat valve (3) with a rotary hand knob (4) and a non-electric temperature sensor (6) for modulating the burner flame (7), and an electromagnetic safety valve kept open for ignition, and a electronic module (10) supplying in a first moment a DC power supply to the safety valve (8), which is then maintained open by a thermocouple (9) heated by the main flame (7). A common electrode (18) is provided both for electronic flame detection and ignition. During the burner pre-ignition step, the absence of flame detection signal (If) permits the gas flow (G) to be cut off after a short timed interval, irrespective of the thermocouple response. In the event of the AC power supply being cut off, the thermocouple ( 9) and the thermostat valve (3) keep the burner modulated independently.

대표청구항 ▼

What is claimed is: 1. A combustion control system having at least one gas burner with a main flame adapted to a domestic bake oven, comprising: a thermostat valve provided with a regulator valve member and a valve body with a gas inlet and at least one gas flow outlet to be supplied to the burner,

What is claimed is: 1. A combustion control system having at least one gas burner with a main flame adapted to a domestic bake oven, comprising: a thermostat valve provided with a regulator valve member and a valve body with a gas inlet and at least one gas flow outlet to be supplied to the burner, wherein the gas flow has been modulated by a temperature sensor of a hydraulic type in cooperation with mechanical means for actuating on the regulator valve member; said thermostat valve having a built-in safety valve housed in said gas inlet, whose actuator electromagnet is kept energized by a thermocouple heated by the main flame after the end of an initial heating time period, and a rotary hand knob which actuates the safety valve mechanically opening it; an electric microswitch operated by means of the thermostat valve hand knob; an electronic module for controlling the burner which connected to the AC voltage supply by way of said microswitch, comprising a spark igniter with an ignition electrode activated during a pre-ignition step with a preset time of short duration, a flame detection circuit connected to a flame current rectification electrode, a circuit supplying a DC voltage to said electromagnet, for the maintenance of the safety valve open, and a timer circuit for a temporary connection of said DC voltage supply circuit to the electromagnet; wherein during said pre-ignition step initiated by the microswitch, the flame detection circuit is connected to said AC voltage supply in combination with the timer circuit for supplying the DC voltage to the safety valve electromagnet, and temporary maintenance of the gas flow without the manual assistance of the rotary knob; and the timer circuit enabling the DC supply circuit for an interval of time, the interval of time depending on a result obtained from the flame rectification detector during the preset short time within the pre-ignition step, to maintain the energization of the safety valve if a flame is detected. 2. The combustion control system according to claim 1, wherein the activation of the igniter and the DC voltage supply circuit is timed for the interval of time, the interval being shorter than said thermocouple energizing time for maintenance of the safety valve, being the gas flow shut off at the end of said preset time for the pre-ignition step, in the event of detecting no flame rectification current, and when a flame current is detected, the detection circuit enables the timer circuit for the connection of the DC voltage supply circuit to the safety valve during an interval following the pre-ignition step, for a length of time that exceeds the duration of said thermocouple heating time. 3. The combustion control system according to claim 1, wherein during the regulation of the gas flow supplied to the burner, and being said detected flame rectification accidentally extinguished, the electronic module activates the igniter during a re-ignition step of short duration for the re-establishment of the main flame, while the gas flow in the burner is maintained by way of the safety valve energized by the flame thermocouple. 4. The combustion control system according to claim 1, wherein being the thermostat valve regulating the gas flow to the burner by means of said hydraulic temperature sensor and said mechanical means, in the event of a AC power shutdown disabling the electronic module, the gas flow to the burner is maintained by way of the safety valve energized by the thermocouple.