JPS61236625A - Pipe material of burner for producing optical glass - Google Patents

Abstract

PURPOSE:To attain the improvement of the working precision of a burner, the assembly strength and the controllability of the burner by connecting both a metallic long pipe for a base end part and a heat resistant short pipe for a tip via a fitting part. CONSTITUTION:The long pipes 15-18 are formed with stainless steel excellent in the heat resistance, the workability and the corrosion resistance and the short pipes 19-22 are formed with ceramics high in the heat resistance and the corrosion resistance. The opposite fitting parts 23-26, 27-30 are formed in the inside and outside peripheral faces of the connection ends of the long pipes 15-18 and the short pipes 19-22 and both the long pipe 15-18 and the short pipes 19-22 are mutually contacted by fitting and fixing these reciprocally. Preferably the fitting faces 35-37 having the broad breadth are formed in the inside peripheries of the base end parts of the long pipes 16-18 and closely fitted to the outside peripheral faces of the pipes of the insides thereof. When presetting properly a number of the pipe material of this structure to be used, a burner having the multiplied pipe structure for producing optical glass can be produced.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a pipe material for constructing a burner for manufacturing optical glass.

(Prior art) V
There is an AD method, and in this VAD method, as is known, a burner with a multi-tube structure is used.

As shown in Fig. 3, the multi-tube structure burner is constructed by concentrically stacking a plurality of pipe materials 1 to 4.
A desired number of channels 5 to 8 are formed between the pipe materials 1 and 4.
The proximal end of ~4 is heat sealed.

Normally, a thin-walled quartz tube is used as the material for the pipe material 1-4 in order to ensure the heat resistance of the burner and to avoid contamination with impurities from the burner.

By the way, in the case of the burner shown in Fig. 3, each pipe material 1 to
4 are fixed to each other by fusion at their base ends, but no means for supporting the pipe materials is taken on the burner tip side to ensure gas flow.

In other words, with the one-end support described above, there is no stability on the burner tip side, and eccentricity of the pipe material phase f tends to occur when assembling the pipe material or when using it in a horizontal or inclined state. The controllability of the flame deteriorates, and the reproducibility needed to produce a high-quality porous glass base material cannot be obtained.

In addition, the burner shown in Fig. 3 must rely on manual labor with low manufacturing efficiency and processing accuracy, and is difficult to handle due to the fragility of being made of glass and the lack of fixing strength of the pipe material.

(Problems to be Solved by the Invention) In view of the above-mentioned problems, the present invention attempts to provide a pipe material for a burner that can improve processing accuracy, assembly strength, controllability, etc. of the burner.

(Means for solving the problem) The pipe material according to the present invention consists of a long metal pipe for the base end and a short heat-resistant non-metallic pipe for the distal end, and is similar to the long pipe. It is characterized in that the pipes are connected in the longitudinal direction through these fitting parts.

(Function) In the case of the pipe material of the present invention, the long pipe for the base end is made of metal, the short pipe for the tip end is made of heat-resistant non-metal, and these pipes are connected in the longitudinal direction. The strength, precision, workability, etc. of the pipe material can be ensured by relying on long metal pipes, and the heat resistance of the tip of the pipe material and prevention of metal ionization can be ensured by using short heat-resistant non-metallic pipes. When multiple pipe materials of different types are overlapped concentrically to form the desired multi-pipe structure, eccentricity can be eliminated by precise fitting in the long metal pipe parts, and because the long pipes are made of metal, The pipe materials can be firmly fixed to each other, and the short pipes, which have drawbacks in strength and workability, can be shortened, so these weak points are alleviated and handling becomes easier.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view showing an example of a multi-tube burner made of the pipe material of the present invention.

In FIG. 1, 11 to 14 are pipe materials, 15 to 18 are long metal pipes that are the base ends of each of the pipe materials 11 to 14, and 19 to 22 are the tip ends of each of the pipe materials 11 to 14. It is a short pipe made of heat-resistant non-metallic material.

More specifically, the long pipes 15 to 18 are made of stainless steel, copper, brass, etc., which have heat resistance, workability, corrosion resistance, etc.
The short pipes 18 to 22 are made of quartz glass, ceramic, etc., which have high heat resistance and corrosion resistance.

The cross-sectional shape of these pipes is circular or polygonal (for example, quadrangular).

The connecting ends of the long pipes 15 to 18 and the short pipes 18 to 22 have fitting portions 23 to 28, 27 to 27 relative to the inner and outer circumferential surfaces thereof.
30 are formed respectively, and these fitting parts 23 to 2
6. Long pipes 15 to 18.27 to 30 are tightly fitted and fixed. Short pipes 18-22 are interconnected.

The long pipes 15 to 18 have connection ports 31 to 34 for connecting gas supply pipes on their base ends, respectively, and among these, the connection port 31 of the long pipe 15 is connected to the long pipe I5.
The end portions of the pipes protrude in the axial direction, and the connection ports 32 to 34 of the other long pipes 16 to 18 protrude in the radial direction of the pipes.

Regarding long pipes, other long pipes 1 except long pipe 15
Wide fitting surfaces 35 to 37 are formed on the inner periphery of the base end portions 6 to 18, and each fitting portion 35 to 37 is in contact with the outer circumferential surface of the pipe on the inside when the pipes are in the overlapping state as shown in the figure. It is designed to fit tightly.

Each of the above-mentioned pipe materials 11-14 is arranged with the smallest diameter in the center, and the pipes with larger diameters are stacked on the outer periphery of the pipe, thereby forming a quadruple pipe structure having flow passages 38 to 41 as shown in Fig. 1. In this case, the fitting surfaces 35' to 37 of the long pipes 16 to 18 are welded or bonded with an adhesive to the outer peripheral surfaces of the long pipes inscribed therein.

FIG. 2 showing another embodiment of the present invention shows the above-mentioned fitting surface 35.
~37 is made larger so that the pipe materials can be fixed to each other by tape winding means.The relationship between the radially adjacent pipe materials is explained by the pipe materials 11 and 12.The long pipe 1B located on the outside A thin annular portion 42 is provided protruding from the base end side of the annular portion 42, and the fitting surface 35 is expanded by the inner circumferential surface of the annular portion 42.

In this embodiment, when the pipe materials 11.12 phase η are overlapped, an adhesive tape 43 is wrapped around the outer periphery of the annular portion 42 and the outer periphery of the long pipe 15, so that the pipe materials 11.12 fixed to each other.

Incidentally, an annular portion similar to that described above is also provided on the proximal end side of the long pipes 17 and 18, the explanation of which is omitted.

It is desirable that the longitudinal dimension of the fitting surfaces 35 to 37 in each of the long pipes 16 to 18 be approximately the same as or -1- larger than the outer diameter (diameter) of these pipes.

By appropriately setting the number of pipe materials to be used, it is possible to create an eight-seater having a multi-pipe structure.

The multi-tube structure burner constructed from the pipe material of the present invention is used by connecting predetermined gas supply pipes to the connection ports 31 to 34 of each of the pipe materials 11 to 14, as in the conventional burner.

(Effects of the Invention) As explained above, the pipe material according to the present invention has a long pipe for the base end made of metal and a short pipe for the tip end made of heat-resistant non-metal. Since the tubes are connected together, a multi-tube burner that satisfies centering accuracy, strength, workability, and ease of handling can be easily produced.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of one embodiment of the pipe material according to the present invention, FIG. 2 is a cross-sectional view of another embodiment of the same pipe material, and FIG. 3 is a cross-sectional view of a conventional example. 11-14...Pipe material 15-18e...Long pipe 18-22...Fist/short pipe 23-30...Fitting part 35-37...Fitting surface agent Patent attorney Yoshio Saifuji Figure J Figure 2 Figure 3

Claims (4)

[Claims] (1) Consisting of a long metal pipe for the proximal end and a short heat-resistant non-metallic pipe for the distal end, the long pipe and the short pipe extend in the longitudinal direction through their fitting parts. A pipe material for a burner for manufacturing optical glass, characterized by being connected. (2) A pipe material for a burner for producing optical glass according to claim 1, wherein the long pipe is made of stainless steel, copper, or brass. (3) A pipe material for a burner for producing optical glass, in which the short pipe is made of either quartz glass or ceramic. (4) A pipe material for a burner for manufacturing optical glass according to claim 1, wherein a wide fitting surface is formed on the inner periphery of the base end of the long pipe.