PREMIXED OXYGEN BURNER

PROBLEM TO BE SOLVED: To ensure a good mixing performance at high capacity by tapering the inner circumferential face at the forward end of a burner port and the outer circumferential face at the forward end of an inner tube to be pointed and tapering the inner circumferential face at the forward end of the inner tube to be enlarged thereby setting back the flat face thereat from the front face of the burner port. SOLUTION: In a plurality of plate members 1, 2 and 3 secured by means of a bolt 8, a fuel chamber 4 serving as a fuel passage is formed between a surface plate member 1 and an intermediate plate 2 while an oxygen chamber 5 serving as an oxygen passage is formed between intermediate plate 2 and a bottom plate 3. A burner port 6 extends from the surface of a block through the fuel chamber 4 and an inner tube 7 extends through the fuel chamber 4 to an oxygen chamber 5. The inner circumferential face at the forward end of the port 6 and the outer circumferential face at the forward end of the tube 7 are tapered to be pointed while the inner circumferential face at the forward end of the tube 7 is tapered to be enlarged. A flat face is formed at the forward end of the tube 7 while being set back slightly from the front face of the port 6, i.e., the surface of a block.