Fuel ignition control arrangement
AssigneeJohnson Service Company
InventorRussell B. Matthews
Life of this patent
Estimating the term…
Abstract
A fuel ignition control arrangement for use in a fuel ignition system includes a control circuit responsive to a thermostatically-controlled circuit element for the fuel ignition system for causing a gaseous fuel to be supplied to burner apparatus of the system, a spark-producing circuit responsive to the thermostatically-controlled element for igniting the fuel supplied to the burner apparatus, a timing circuit responsive to the thermostatically-controlled element for de-energizing the control circuit after a predetermined timing interval, and a flame sensing circuit responsive to the ignition of the fuel supplied to the burner apparatus for maintaining the control circuit in fuel supplying condition.
Claims18
In an automatic fuel ignition system including valve means operable when energized to permit a gaseous fuel to be supplied to burner apparatus in response to a thermostatically-controlled means, an arrangement comprising control means including first timing means responsive to said thermostatically-controlled means for effecting energization of said valve means to permit fuel to be supplied to the burner apparatus, igniting means including spark producing means responsive to energization of said valve means to produce ignition sparks for igniting fuel supplied to the burner apparatus when said valve means is in fuel supplying condition to establish a flame, and second timing means responsive to said thermostatically-controlled means for controlling said first timing means for de-energizing said control means after a predetermined timing interval whenever a flame fails to be established within said timing interval, said control means including flame sensing means responsive to the ignition of the fuel supplied to the burner apparatus to override said second timing means for enabling said control means to maintain said valve means energized, and further flame sensing means responsive to the ignition of the fuel supplied to the burner apparatus for de-energizing said spark producing means.
In an automatic fuel ignition system including valve means operable when energized to permit a gaseous fuel to be supplied to burner apparatus in response to actuation of a thermostatically-controlled means, an arrangement comprising control means including first timing means responsive to said thermostatically-controlled means for effecting energization of said valve means to permit fuel to be supplied to the burner apparatus, fuel igniting means including spark producing means responsive to said thermostatically-controlled means for producing ignition sparks for igniting fuel supplied to the burner apparatus to establish a flame, and second timing means responsive to said thermostatically-controlled means for controlling said first timing means for de-energizing said control means after a predetermined timing interval whenever a flame fails to be established within said timing interval, and flame sensing means responsive to the ignition of the fuel supplied to the burner apparatus to override said second timing means to maintain said valve means energized, said spark producing means including means for de-energizing said spark producing means at a predetermined time after said thermostatically-controlled means is actuated.
In an automatic fuel ignition system including valve means operable when energized to permit a gaseous fuel to be supplied to burner apparatus in response to a thermostatically-controlled means, an arrangement comprising igniting means operable when enabled to produce ignition sparks for igniting fuel supplied to the burner apparatus to establish a flame, control means including a bi-stable switching means operable when enabled to energize said valve means and said igniting means, and pulse generating means including a controlled switching device having an output electrode connected to said bi-stable switching means and first timing means including first timing capacitor means connected to control electrodes of said controlled switching device and responsive to said thermostatically-controlled means connecting a source of power thereto to periodically enable said controlled switching device to provide enabling pulses at said output electrode for said bistable switching means for energizing said valve means to permit fuel to be supplied to the burner apparatus, and second timing means including second timing capacitor means connected to said first timing means for controlling said first timing means to disable said control means after a predetermined timing interval whenever a flame fails to be established within said timing interval, said control means including flame sensing means connected to said second timing means and responsive to the ignition of the fuel supplied to the burner apparatus to override said second timing means for enabling said control means to maintain said valve means energized.
In an automatic fuel ignition system including valve means having a valve actuator coil energizable to operate said valve means to permit a gaseous fuel to be supplied to burner apparatus in response to a thermostatically-controlled means, an arrangement comprising control means including said valve actuator coil and pulse generating means including first timing means responsive to said thermostatically-controlled means for effecting energization of said valve actuator coil to operate said valve means to permit fuel to be supplied to the burner apparatus, igniting means operable in response to energization of said actuator coil to produce ignition sparks for igniting fuel supplied to the burner apparatus to establish a flame, and second timing means responsive to said thermostatically-controlled means for controlling said first timing means for de-energizing said control means after a predetermined timing interval whenever a flame fails to be established within said timing interval, said control means including flame sensing means responsive to the ignition of the fuel supplied to the burner apparatus to override said second timing means for enabling said control means to maintain said valve means energized.
In an automatic fuel ignition system including valve means operable when energized to permit a gaseous fuel to be supplied to burner apparatus in response to a thermostatically-controlled means, an arrangement comprising control means including pulse generating means and first timing means responsive to said thermostatically-controlled means for controlling said pulse generating means to provide pulse outputs at a first level for effecting energization of said valve means to permit fuel to be supplied to the burner apparatus and for maintaining said valve means energized whenever a flame is established, igniting means operable when enabled to produce ignition sparks for igniting fuel supplied to the burner apparatus to establish a flame, and second timing means responsive to said thermostatically-controlled means for controlling said first timing means to disable said pulse generating means for de-energizing said control means after a predetermined timing interval whenever the flame fails to be established within said timing interval, said control means including flame sensing means responsive to the ignition of the fuel supplied to the burner apparatus to override said second timing means for enabling said control means to maintain said valve means energized, said pulse generating means being controlled by said first timing means to provide pulse outputs at a second level whenever the flame is extinguished to de-energize said valve means.
In an automatic fuel ignition system including valve means operable when energized to permit a gaseous fuel to be supplied to burner apparatus in response to a thermostatically-controlled means, an arrangement comprising control means including pulse generating means and flame sensing means, said pulse generating means being responsive to said thermostatically-controlled means for providing periodically recurring pulses at a first level for effecting energization of said valve means to permit fuel to be supplied to the burner apparatus, igniting means operable when enabled to produce ignition sparks for igniting fuel supplied to the burner apparatus to establish a flame, and timing means responsive to said thermostatically controlled means for disabling said pulse generating means after a predetermined timing interval to effect de-energization of said valve means whenever a flame fails to be established within said timing interval, said flame sensing means being responsive to the ignition of the fuel to override said timing means to maintain said pulse generating means enabled to thereby maintain said valve means energized when a flame is established, and said timing means being operable when the flame is extinguished to control said pulse generating means to provide pulses at a second level to thereby permit said valve means to be de-energized.
Dependencies are inferred from the claim text.