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US 4,188,181 AGranted
Gas burner control system
AssigneeEmerson Electric Co.
InventorsDennis M. Rippelmeyer, Robert L. Baysinger
Life of this patent
Estimating the term…
Abstract
A gas burner control system utilizes an electrical resistance igniter to ignite a main burner. Electronic sensing means is located adjacent the burner and adjacent a portion of the igniter where opposite voltage polarity exists between the igniter and sensing means. Current flows from the igniter to the sensing means when the igniter is heated above ignition temperature. Circuit means is responsive to such current flow to de-energize the igniter and enable gas to flow for a timed trial ignition period, the igniter having sufficient mass to remain at or above ignition temperature for the trial ignition period. When ignition occurs, the circuit means is responsive to current flow through burner flame from the sensing means to the burner to maintain gas flow.
Claims9
In a gas burner control system,
- a burner;
- an electrical resistance igniter for igniting said burner;
- sensing means located in close proximity to said igniter and said burner;
- and
- circuit means connected to said sensing means responsive to absence of current flow between said igniter and said sensing means when said igniter is below ignition temperature for effecting energizing of said igniter, and responsive to presence of current flow between said igniter and said sensing means when said igniter is above ignition temperature for effecting flow of gas to said burner, and responsive to presence of current flow between said sensing means and said burner when burner flame exists for maintaining gas flow to said burner.
2 more elements
In a gas burner control system,
- a burner;
- an electrical resistance igniter for igniting said burner;
- sensing means located in close proximity to said igniter and said burner;
- first circuit means connected to said sensing means responsive to absence of current flow between said igniter and said sensing means when said igniter is below ignition temperature for effecting energizing of said igniter, and responsive to presence of current flow between said igniter and said sensing means when said igniter is above ignition temperature for effecting de-energizing of said igniter;
- and
- second circuit means connected to said sensing means and to said first circuit means responsive to de-energizing of said igniter for enabling gas to flow to said burner, and responsive to presence of current flow between said sensing means and said burner when burner flame exists for maintaining gas flow to said burner.
3 more elements
In a gas burner control system,
- a burner;
- an electrical resistance igniter for igniting said burner having a beginning portion connected to one side of a power source and an end portion connected to an opposite polarity side of said power source, and having sufficient mass to remain above ignition temperature for a timed trial ignition period after being de-energized;
- a sensing probe located in close proximity to said burner and to said beginning portion of said igniter and electrically connected to said opposite polarity side of said power source through electrically operated control means;
- said control means including first circuit means connected to said probe for effecting energizing of said igniter to a temperature above ignition temperature and for effecting de-energizing of said igniter in response to a sufficient current flow between said igniter and said probe which occurs when said igniter is above ignition temperature;
- said control means further including second circuit means connected to said first circuit means and responsive to de-energizing of said igniter for allowing gas to flow to said burner for said trial ignition period;
- and
- said second circuit means also being connected to said probe and responsive to current flow between said probe and said burner through burner flame for allowing gas to continue to flow after said trial ignition period.
4 more elements
In a gas burner control system,
- a burner;
- an A.C. power source;
- an electrical resistance igniter for igniting said burner connected across said A.C. power source through a first switch;
- a sensing probe;
- a voltage step-down transformer having a primary winding connected across said A.C. power source and a secondary winding;
- first circuit means connected to said probe and across a portion of said primary winding;
- said probe being positioned adjacent a beginning portion of said igniter and connected through said first circuit means to an end portion of said igniter so that when said igniter is heated above a temperature sufficient to ignite gas, current flows from said igniter to said probe;
- said first circuit means including a series connected second switch and an electrical winding associated with an electrically operated control means for controlling conduction of said first switch;
- said first circuit means further including means effective in absence of said current flow from said igniter to said probe to cause conduction of said second switch and effective in presence of said current flow to prevent conduction thereof;
- second circuit means connected to said probe and said first circuit means and across said portion of said primary winding;
- said probe being positioned adjacent said burner so that when burner flame is established, current flows from said probe to said burner;
- said second circuit means including a series connected third switch and an electrical winding associated with an electrically operated control means for controlling flow of gas to said burner;
- said second circuit means further including means responsive to conduction of said second switch for preventing conduction of said third switch and responsive to subsequent non-conduction of said second switch for effecting conduction of said third switch, and responsive to said current flow from said probe to said burner for maintaining conduction of said third switch;
- and
- a capacitor connected across said A.C. power source and in parallel with said series connected third switch and electrical winding for effecting flow of gas upon discharge thereof through said series connected third switch and electrical winding.
12 more elements
Dependencies are inferred from the claim text.