High velocity tuyere with convoluteshaped cooling passageway

Claim 1

IN A BLAST FURNACE TUYERE HAVING AN OUTER WALL, A NOSE END, A HEAD END AND AN INNER WALL FORMING A CENTRAL OPENING ALONG THE LONGITUDINAL AXIS OF SAID TUYERE, A COOLING MEDIUM PASSAGE, DISPOSED BETWEEN SAID CENTRAL OPENING AND THE OUTER SURFACE OF SAID TUYERE, SAID COOLING MEDIUM PASSAGE COMPRISING: A FIRST CONVOLUTE-SHAPED SECTION CURVED ABOUT SAID LONGITUDINAL AXIS IS A SUBSTANTIALLY CYLINDRICAL SHAPE, WHEREBY THE AXIS OF SAID CONVOLUTE-SHAPED SECTION IS SUBSTANTIALLY COAXIAL WITH SAID TUYERE AXIS, SAID CONVOLUTE-SHAPED SECTION HAVING AN INLET END AND AN OUTLET END AND TWO EDGES; SAID CONVOLUTE-SHAPED SECTION EXTENDING BETWEEN SAID HEAD END AND SAID NOSE END OF SAID TUYERE AND INCLUDING MEANS FOR PROGRESSIVELY COOLING FROM SAID HEAD END TOWARD SAID NOSE END OF SAID TUYERE; ONE OF SAID EDGES BEING SPACED FROM SAID REMAINING EDGE; A SECOND INLET SECTION HAVING ONE END INTEGRAL WITH SAID INLET END OF SAID CONVOLUTE-SHAPE SECTION, AND ANOTHER END TERMINATING AT SAID HEAD END OF SAID TUYERE; A THIRD SECTION HAVING ONE END INTEGRAL WITH SAID OUTLET END OF SAID CONVOLUTE-SHAPED SECTION AND EXTENDING FROM SAID NOSE END OF SAID TUYERE REARWARDLY TOWARD SAID HEAD END OF SAID TUYERE BETWEEN SAID EDGES OF SAID CONVOLUTE-SHAPED SECTION; AND A FOURTH OUTLET SECTION HAVING ONE END INTEGRAL WITH THE REMAINING END OF SAID THIRD SECTION AND ANOTHER END TERMINATING AT SAID HEAD END OF SAID TUYERE; SAID COOLING MEDIUM PASSAGE COMPRISING SAID FOUR SECTIONS ALL OF WHICH ARE POSITIONED IN A SUBSTANTIALLY CYLINDRICAL PLANE; THE CROSS SECTIONAL AREA OF SAID PASSAGE, TRANSVERSE TO THE DIRECTION OF FLOW OF A COOLING MEDIUM, BEING SUBSTANTIALLY UNIFORM THROUGHOUT SAID COOLING MEDIUM PASSAGE; WHEREBY SAID COOLING MEDIUM PASSAGE IS ADAPTED TO RECEIVE A COOLING MEDIUM WHICH MOVES PROGRESSIVELY FROM SAID HEAD END TOWARD SAID NOSE END AND PASSES THROUGH SAID INLET SECTION, SAID CONVOLUTE-SHAPED SECTION AND SAID THIRD SECTION PRIOR TO EXITING FROM SAID TUYERE THROUGH SAID OUTLET SECTION.