| 摘要 |
A new and improved thermal torch or lance and method for boring, cutting, burning and the like of hard base materials which facilitates concentrating and intensifying the thermic reaction thereof. The arrangement includes an elongated hollow inner sleeve or casing generally coextensively received within an elongated hollow outer sleeve or casing with the two casings being dimensioned so that a first gas flow passage is defined therebetween over the cooperative lengths thereof. At least one elongated rod is received within the inner casing in a manner defining at least one second gas flow passage over the cooperative lengths thereof. In operation oxygen is passed under pressure through the first and second passages from the torch inlet end to and outwardly from the torch discharge end. Oxygen passing outwardly from the second passage cooperates in the thermic reaction as is conventional in prior thermal torches. Oxygen passing outwardly from the first passage acts as a gas envelope surrounding the primary thermic reaction to thereby confine and intensify it.
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