Patent Application
20070224557
1. Field of the Invention
The present invention is related to a controller for re-ignition, and especially to such a controller for re-igniting used on a combustion device to afford ignition, flame detecting and re-igniting fire after extinguishment.
2. Description of the Prior Art
Generally, safety designs for extinguishing fire in a burner for gas combustion mostly only are designs to interrupt supplying gas for combustion when fire is extinguished. For instance: a flame probe is provided on the burner, when the flame probe detects the flame on the burner is interrupted, a related control unit provided on a combustion device stops supplying combustion gas for the burner for the purpose of preventing incurrence of combustion gas leakage.
However, interruption of a flame on the burner often affects the expected effect of operation of combustion gas, for example, many household cooking gas stoves are advanced and are controlled to be in timing or presetting modes, and even are electronically and digitally controlled, in the timing cooking processes of these gas stoves, if interruption of supplying combustion gas occurs for the sake of safety when flames on the burners are blown out by strong wind, it is very probable that a result that cooked foods are unable to get their expected effect of cooking is incurred, and even the foods may decay by virtue that they are placed in room temperatures too long.
In view of the above technical defects, the inventor of the present invention provides a controller for re-ignition, the controller for re-ignition is connected with each of a plurality of ignition and flame detecting probes of burners provided on a combustion device, and is communicated with each of a plurality of igniting switches provided on the combustion device; the amount of ignition and flame detecting probes and the igniting switches surely can correspond to the amount of the burners. The object of the present invention can be a combustion device with a single burner or with a plurality of burners.
The controller for re-ignition at least is provided in a control box with:
An ignition control unit having a rectifying voltage stabilizer for rectifying and stabilizing electric current to DC12V, a relay connected to the rear end of the rectifying voltage stabilizer, a controller for switching the state of operating of the relay and an idling protecting device;
an ignition activating unit having a voltage multiplier for voltage multiplying on output electric power provided by the relay, a diode D1 connected to the rear end of the voltage multiplier, a resistant R1 connected to the rear end of the diode D1, an electric storage and discharge device connected to the rear end of the resistant R1 and a voltage supercharger connected to the rear end of the electric storage and discharge device and connected with the ignition and flame detecting probes;
a flame detecting unit integrating therein a flame detecting and ignition control circuit, and connecting respectively with an ignition and flame detecting probe and a ignition control unit; wherein a flame detecting circuit is for coupling of the electric supply through a capacitor C6 to provide voltage for the ignition and flame detecting probe via a resistant R8, a grounding end is provided between the resistant R8 and the ignition and flame detecting probe for detecting whether a flame on a burner exists; one end of the ignition control circuit is connected with the above mentioned controller, its other end is connected with an igniting switch.
By cooperation of the above members, when the igniting switch is turned on, and a flame does not exist on the burner, the ignition control unit drives the ignition activating unit for operation, thus the ignition and flame detecting probe starts to discharge with high voltage for ignition; when the ignition and flame detecting probe detects a flame, the ignition control unit stops driving the ignition activating unit; if extinguishment occurs during the process of burning on the burner, by detecting of the ignition and flame detecting probe, the ignition control unit once more drives the ignition activating unit for operation, and the ignition and flame detecting probe once more discharges with high voltage for ignition.
The present invention will be apparent in its technical measures after reading the detailed description of the preferred embodiment thereof in reference to the accompanying drawings.
Referring to
The control box 10 can be provided with a plurality of ignition and flame detecting connecting ports 51 to connect the controller for re-ignition with an ignition and flame detecting probe 100 on each of a plurality of burners, the control box 10 is provided on its other end with electronic connecting ports 52 to communicate the controller for re-ignition with each igniting switch 101 of a gas combustion device, the electronic connecting ports 52 further communicate and integrate the controller for re-ignition with the power supply 60 or other electronic devices.
Further referring to
an ignition control unit 20 has a rectifying voltage stabilizer for rectifying and stabilizing electric current on an AC-L end to DC12V, a relay 22 connected to the rear end of the rectifying voltage stabilizer 21, a controller 23 for switching the state of operating of the relay 22 and an idling protecting device 24; wherein the rectifying voltage stabilizer 21 is composed of a capacitor C2, a diode D2, a diode D3, a resistant R3, a Zener diode ZD1 and a capacitor C3; the controller 23 is composed of an NPN transistor Q2 and an NPN transistor Q3; a base B of the NPN transistor Q3 is connected with a flame detecting unit 40; the ignition control unit 20 has therein a resistant R5, a resistant R6 and a capacitor C5 for controlling the time delay between extinguishing and ignition as well as ignition and ceasing ignition of the B electrode of the NPN transistor Q2; the ignition control unit 20 has therein a resistant R7, a resistant R9, a capacitor C8 and a Zener diode ZD3 for controlling the time delay between ignition and ceasing ignition of the base B of the NPN transistor Q3;
an idling protecting device 24 is composed of a resistant R2, a resistant R4 and an NPN transistor Q1, the idling protecting device 24 is used to prevent the Zener diode ZD1 from damage by bearing overlarge electric current when in an idle state.
An ignition activating unit 30 has therein a voltage multiplier 31 for voltage multiplying on an output electric power provided by the relay 22, a diode D1 connected to the rear end of the voltage multiplier 31, a resistant R1 connected to the rear end of the diode D1, an electric storage and discharge device 32 connected to the rear end of the resistant R1 and a voltage supercharger 33 connected to the rear end of the electric storage and discharge device 32 and connected with the ignition and flame detecting probe 100; the voltage multiplier 31 is composed of a capacitor C1 and a diode D5, the electric storage and discharge device 32 is composed of a capacitor C4 and a fast thyrister SDIAC;
a flame detecting unit 40, integrates therein a flame detecting and ignition control circuit, and connects respectively with the ignition and flame detecting probe 100 and the ignition control unit 20; wherein the flame detecting circuit is for coupling of the electric supply 60 through the capacitor C6 to provide voltage for the ignition and flame detecting probe 100 via the resistant R8, a grounding end is provided between the resistant R8 and the ignition and flame detecting probe 100 for detecting whether a flame exists on a burner; one end of the ignition control circuit is connected with the above mentioned controller 23, its other end is connected with the igniting switch 101.
Wherein the ignition control circuit further includes a resistant R14 connecting to a gate G of a field effect transistor Q4, an source S of the field effect transistor Q4 is connected to an AC-N end of the electric supply 60 via the igniting switch 101. When the source S is connected to the AC-N end of the electric supply 60, and at this time, the ignition and flame detecting probe 100 is unable to detect whether a flame exists on a burner; a positive half wave of the AC voltage turns on a DS (drain and source) of the field effect transistor Q4, the DS (drain and source) of the field effect transistor Q4 is cut off at an AC negative half wave, so that an ignition voltage transformer VCC charges and discharges to the capacitor C8 via the resistant R9, the voltage for charging the capacitor C8 is lower than 2.2 V; when the voltage of the base B of the NPN transistor Q3 is zero, a CE (collector and emitter) of the NPN transistor Q3 is cut off, and the CE (collector and emitter) of the NPN transistor Q2 is turned on, so that the relay 22 is closed, the ignition control unit 20 drives the ignition activating unit 30 to do the action of igniting.
When the ignition and flame detecting probe 100 detects a flame and induces bias moving to make the potential of the gate G of a field effect transistor Q4 lower than that of the AC-N end of the electric supply 60, the DS (drain and source of the field effect transistor Q4 is cut off, and the CE (collector and emitter) of the NPN transistor Q2 is turned on, the CE (collector and emitter) of the NPN transistor Q2 is cut off, so that the relay 22 is opened, the ignition control unit 20 stops driving the ignition activating unit 30 for the action of igniting.
And if the ignition and flame detecting probe 100 detects that the burner in operation has the situation of extinguishing in the middle of operation, the gate G of a field effect transistor Q4 restore its potential, the ignition control unit 20 again drives the ignition activating unit 30 to do the action of igniting.
By cooperation of the above members, when the igniting switch 101 is turned on, while there is no flame on the burner, the ignition control unit 20 drives the ignition activating unit 30 to render the ignition and flame detecting probe 100, thus the ignition and flame detecting probe 100 starts to discharge with high voltage for ignition; when the ignition and flame detecting probe 100 detects a flame, the ignition control unit 20 stops driving the ignition activating unit 30; if extinguishment occurs during the process of burning on the burner, by detecting of the ignition and flame detecting probe 100, the ignition control unit 20 once more drives the ignition activating unit 30 for operation, and the ignition and flame detecting probe 100 once more discharges with high voltage for ignition.
Additionally, the present invention can further cooperate with a grounding discharging end 200 in practicing, the grounding discharging end 200 keeps the space between the portion so called as a secondary portion of a high voltage pack and a grounding line very short, in order that the high voltage is released toward a grounding line to avoid the high voltage affecting related loops.
As shown in
The preferred embodiment shown and described is only for illustrating the present invention, and not for giving any limitation to the scope of the present invention; it will be apparent to those skilled in this art that various modifications or changes without departing from the spirit of this invention shall also fall within the scope of the appended claims.
