Patent ID: 8517721
Filing Date: 2013-08-27
Classification: C03B,Y02P

Abstract:
1. A burner for fabricating an optical fiber perform, comprising: a first tube having a front end configured to define a glass raw material port for ejecting a glass raw material gas; a second tube coaxially arranged outside the first tube and having a front end portion configured to define a sealing gas port for ejecting a sealing gas together with the front end portion of the first tube; a third tube coaxially arranged outside the second tube and provided with a front end portion configured to define a burnable gas port for ejecting a burnable gas together with the front end portion of the second tube; and a plurality of small diameter nozzles arranged in a space formed between the second tube and the third tube; each of the nozzles having a front end arranged on a concentric circle relative to the glass raw material gas port, and configured to define a combustion assisting gas port for ejecting a combustion assisting gas, each of the plurality of the combustion assisting gas ports having the same focal length; wherein the front end portion of the second tube protrudes ahead of the front end portion of the first tube in a gas ejecting direction, and the front end portion of the third tube protrudes ahead of the front end portion of the second tube and the front end portion of each of the nozzles in the gas ejecting direction, wherein the plurality of small diameter nozzles are disposed in an annular channel for the burnable gas which is defined by the second and third tubes.