Ignitor for fuel burner

Claim 1

AN IGNITOR FOR A FUEL BURNER INCLUDING AN AIR TUBE HAVING A TURBULENT AIR FLOW THEREIN, COMPRISING A MAIN BARREL CLOSED AT ITS FORWARD END AND TERMINATING REARWARDLY IN A PERFORATE CYLINDRICAL ELEMENT FORMING A MAIN FLAME RETENTION NOZZLE TO BE EXPOSED TO SAID TURBULENT AIR FLOW, A PRIMARY GAS SUPPLY PIPE HAVING A DISCHARGE TIP DISPOSED CONCENTRIC WITH SAID BARREL, A MIXING TUBE CONCENTRIC WITH SAID PRIMARY GAS SUPPLY PIPE SPACED RADIALLY FROM SAID GAS SUPPLY PIPE AND INWARDLY FROM SAID BARREL TO PROVIDE SEPARATE INNER AND OUTER ANNULAR AIR PASSAGES AND HAVING MEANS TO CLOSE THE FORWARD END OF SAID INNER AIR PASSAGE, SAID MIXING TUBE HAVING AN OPENING IN ADVANCE OF SAID TIP FOR ADMITTING AIR FROM SAID OUTER ANNULAR PASSAGE TO SAID INNER ANNULAR PASSAGE FOR MIXING WITH THE GAS FROM SAID TIP TO FORM A COMBUSTIBLE MIXTURE, WHEREBY SAID TIP SERVES AS AN INSPIRATOR TO INDUCE AIR FLOW FROM SAID MAIN NOZZLE FORWARDLY THROUGH SAID OUTER ANNULAR PASSAGE AND INTO SAID INNER ANNULAR PASSAGE AND A PERFORATE CYLINDRICAL MEMBER CARRIED BY SAID MIXING TUBE AND EXTENDING REARWARDLY OF SAID TIP TO FORM A PRIMARY FLAME RETENTION NOZZLE WHICH IS SPACED AXIALLY IN ADVANCE OF THE END OF SAID MAIN NOZZLE TO LEAVE A GAS IGNITION ZONE WITHIN SAID MAIN NOZZLE, A MAIN GAS SUPPLY PIPE WITHIN SAID BARREL AND OUTSIDE OF SAID MIXING TUBE AND SAID PERFORATE CYLINDRICAL MEMBER HAVING A TIP DISPOSED TO SUPPLY RAW GAS TO THE ZONE OF SAID MAIN NOZZLE FOR COMBUSTION, AN IGNITION ELECTRODE TERMINATING WITHIN SAID PRIMARY NOZZLE AND ADAPTED TO IGNITE THE GAS WITHIN SAID PRIMARY NOZZLE, AND A FLAME SENSING ELEMENT DISPOSED IN SAID MAIN NOZZLE IN THE PATH OF THE FLAME THEREIN WHEREBY THE PRIMARY IGNITOR FLAME IS FIRST FORMED WITHIN SAID PRIMARY RETENTION NOZZLE AND A MAIN IGNITOR FLAME IS THEN FORMED WITHIN SAID MAIN RETENTION NOZZLE AND IS SENSED BY SAID FLAME-SENSING ELEMENT.