Nozzle mixing burner assembly

Claim 1

A GAS BURNER ASSEMBLY FOR THE INTERIOR FIRING OF AN OPEN-ENDED RADIANT TUBE, SAID ASSEMBLY COMPRISING, IN COMBINATION, A BURNER CASING HAVING A REAR WALL PROVIDED WITH AN AIR DISCHARGE OPENING THEREIN DESIGNED FOR REGISTER WITH ONE OPEN END OF THE RADIANT TUBE TO BE FIRED, SAID CASING HAVING ANOTHER WALL PROVIDED WITH AN AIR INLET OPENING THEREIN, MEANS CONSTRAINING AIR INTRODUCED INTO THE CASING THE FLOW IN AN INVOLUTE PATH AND BECOME DISCHARGED FROM SAID AIR DISCHARGE OPENING IN A REARWARD DIRECTION WITH A SWIRLING MOTION AND AT A LOWER VELOCITY, AN ELONGATED TUBULAR GAS NIPPLE SUPPORTED AT ITS FRONT END BY SAID CASING AND PROJECTING COAXIALLY THROUGH SAID AIR DISCHARGE OPENING, A GENERALLY CLYINDRICAL GAS NOZZLE MOUNTED ON THE REAR END OF SAID GAS NIPPLE IN COAXIAL RELATIONSHIP WITH THE NIPPLE AND PROVIDING AN INTERNAL GAS CHAMBER IN COMMUNICATION WITH SAID GAS NIPPLE, SAID NOZZLE AND NIPPLE BEING ADAPTED FOR PROJECTION INTO SAID TUBE THROUGH SAID ONE REAR OPEN END THEREOF, MEANS PROVIDING A SERIES OF CIRCUMFERENTIALLY SPACED RADIAL PORTS IN COMMUNICATION WITH SAID INTERNAL GAS CHAMBER, MEANS FOR REGULABLY SUPPLYING GAS TO SAID GAS NIPPLE, AND MEANS FOR SUPPLYING AIR TO SAID CASING THROUGH SAID AIR INLET OPENING.