Patent ID: 7587914
Filing Date: 2009-09-15
Classification: C03B,F23D,F23L

Abstract:
1. A burner for manufacturing an optical fibre preform said burner comprising: a plurality of coaxial tubes with a common vertical axis, each two adjacent coaxial tubes defining an annular channel between themselves, wherein there are at least two annular channels; a gas distribution chamber at one extremity of each of said annular channels, wherein each distribution chamber is vertically displaced by the other distribution chambers; and a plurality of gas-feeding ducts, each gas-feeding duct opening into a corresponding one of said distribution chambers for feeding a gas therein, wherein each of said gas-feeding ducts has a longitudinal axis and is positioned such that said longitudinal axis does not intersect said vertical axis and lies on a plane transversal thereto, and wherein said gas-feeding ducts are angularly displaced with respect to one another.