JP3059267B2 - Radiant tube burner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radiant tube burner used as a heating source for an atmosphere heat treatment furnace or the like.

[0002]

2. Description of the Related Art In a radiant tube burner of this type, an inner tube made of cast steel and provided with a mounting flange of the same material or a different material at a base end thereof, or a cylindrical body and a mounting flange are integrally formed. A ceramic inner tube or the like is used.

[0003] In the radiant tube burner, a portion of the inner tube from a portion around the burner nozzle to a tip thereof is formed with a combustion chamber therein, and is directly exposed to a flame. When the furnace temperature is 900 ° C, the temperature rises until the maximum temperature becomes close to 1100 ° C. However, at the base end portion of the inner tube away from the part around the burner nozzle, 400 ° C
Temperature. Therefore, in the case of a metal inner tube, the distal end portion is quickly damaged and the service life of the entire inner tube is shortened. In the case of a ceramic inner tube, excessive heat resistance is imparted to the proximal end portion of the inner tube, and However, there is a problem that the manufacturing cost is high. An object of the present invention is to solve the above problems.

[0004]

According to the present invention, there is provided a radiant tube burner in which a burner nozzle is inserted into an inner tube inserted into the outer tube with a gap therebetween, and a combustion chamber is formed ahead of the burner nozzle. A first tube body formed of a refractory material and surrounding the combustion chamber; and a second metal tube installed adjacent to a base end of the first tube body. And the two tube bodies are connected so as to be separable.

[0005]

A first tube body formed of a refractory material;
The inner tube is formed by connecting the second tube body made of metal in a separable manner, and the combustion chamber formed at the end of the burner nozzle is surrounded by the first tube body. The durability of the part to be formed is increased, and the two tubes are separated when necessary.

[0006]

Since the present invention is constructed as described above, a first fire-resistant tube is disposed in a portion of the inner tube which needs to be fire-resistant by being exposed to a flame, and A metal second tube body is disposed in a portion that is not exposed and does not require fire resistance, and the inner tube has two heat resistance characteristics each adapted to a partial temperature difference of the inner tube due to combustion of gas fuel. The inner tube can be made of a material, and the heat resistance of the entire inner tube can be balanced to ensure the durability of the inner tube. Further, since the first tube body and the second tube body can be separated from each other, the first tube body and the second tube body can be made compatible with each other. When one of the tubes is damaged, the inner tube can be easily repaired by replacing the damaged tube.

[0007]

Next, one embodiment of the present invention will be described with reference to the drawings. In a single-end type radiant tube burner B applied as a heating source of an atmosphere heat treatment furnace or the like, a burner body 1 has an air inlet 2 connected to an air supply pipe, and an exhaust gas outlet 3 connected to an exhaust gas pipe. Has been established.

A gas inlet 16 is provided at the center of the burner body 1.
A gas pipe 4 communicated with a gas supply pipe through the gas pipe 4 is inserted. A spark plug 5 for ignition is inserted into the center of the gas pipe 4, and the outer diameter of the gas pipe 4 near the tip is enlarged at the tip. The connected stepped cylindrical burner nozzle 6 is connected.

An outer tube receiver 1a formed at the distal end of the burner body 1 has a cylindrical outer tube 7 with a lid whose distal end is closed by a lid 7a via a mounting flange 7b formed at the base end thereof. Installed.

A cylindrical inner tube 8 having a base end portion inserted into the center of the burner body 1 and a burner nozzle 6 inserted therein is inserted into the outer tube 7 with a gap therebetween.

An exhaust gas passage 12 through which exhaust gas flows is formed between the outer tube 7 and the inner tube 8, and an air passage 13 through which air supplied to the burner nozzle 6 flows between the inner tube 8 and the gas pipe 4. Is formed, and a combustion chamber 14 is formed ahead of the burner nozzle 6 in the inner tube 8.

The inner tube 8 is formed of a ceramic material (refractory material) into a cylindrical shape, forms a portion of the inner tube 8 extending from a tip portion thereof to a portion around the burner nozzle 6, and surrounds the combustion chamber 14. A first tube body 9 to be formed and a cylindrical shape with a flange made of a metal material such as cast steel to form a portion of the inner nozzle 8 extending from a portion around the burner tube 6 to a base end thereof, and the first tube A second tube body 10, which is installed adjacent to the base end of the body 9 in abutting manner and surrounds the air passage 13.
And is divided into:

At the base end of the second tube body 10, a mounting flange 10a bolted to the burner body 1 is formed so as to protrude therefrom. A cylindrical tube support 11 tightly fitted into the tube support 11 is integrally fixed in a step-like manner, and the vicinity of the base end of the first tube body 9 is closely fitted to a front portion inside the tube support 11. It is fitted and fixed.

The first tube body 9 is a tube support 1
The first tube body 9 is detachably coupled to the tube support 11 by an appropriate number of setscrews 15 which are screwed into the screw holes of the first tube body 9 and fitted into the holes of the first tube body 9. The 9 and the second tube bodies 10 are connected via a tube support 11 so as to be separable in an abutting state, and the gap between the first tube body 9 and the tube support 11 is sealed by a sealing material.

Next, the operation and effect of the embodiment having the above configuration will be described. In the present embodiment, the inner tube 8 is formed of a ceramic material into a cylindrical shape and forms a portion extending from a tip portion of the inner tube 8 to a portion around the burner nozzle 6 and surrounds the combustion chamber 14. 9 and a second metal tube body 1 attached to the burner body by a mounting flange 10 formed at the base end portion and installed adjacent to the base end portion of the first tube body 9.
The two tube bodies 9 and 10 are separated and connected to each other by a tube support 11 fixed to the tip of the second tube body 10.

For this reason, a portion of the inner tube 8 which needs to be fire-resistant when exposed to a flame is made of a ceramic first material.
And a metal second tube body 10 is disposed at a portion where the inner tube 8 is not exposed to a flame and does not need to have fire resistance. The inner tube 8 can be made of two materials having heat resistance characteristics adapted to the temperature difference, and the heat resistance of the entire inner tube 8 can be balanced to ensure the durability of the inner tube 8.

Further, since the first tube body 9 is formed of a ceramic material into a cylindrical shape and the second tube body 10 is formed of a metal material, a flanged tube body is formed of a ceramic material. In comparison, the manufacturing cost of the tube body can be reduced.

Further, a second fastener fastened to the burner body 1
Since the mounting flange 10a of the tube body 10 is formed of a metal material, the shape of the mounting flange 10a is easily changed in accordance with the shape of the burner body 1 so that the inner tube 8 is firmly attached to the burner body 1 of each shape. Can be installed stably.

Further, since the first tube member 9 and the second tube member 10 can be separated from each other, the first tube member 9 and the second tube member 10 can be made compatible with each other. When one of the tubes 9 and 10 is damaged, the inner tube 8 can be easily repaired by replacing the damaged tube body.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a main part showing one embodiment of the present invention.

FIG. 2 is a half sectional view of a radiant tube burner.

[Explanation of symbols]

 Reference Signs List 6 burner nozzle 7 outer tube 8 inner tube 9 first tube body 10 second tube body 11 tube support 14 combustion chamber

────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masatoshi Kamikachi 2-1-1821 Yawatadai, Seto City, Aichi Prefecture (56) References JP-A-2-279907 (JP, A) JP-A-1-285703 ( JP, A) JP-A 4-73715 (JP, U) JP-A 2-115555 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F23D 14/12 F23C 3/00 301 C21D 1/34

Claims (1)

(57) [Claims] 1. A radiant tube burner in which a burner nozzle is inserted into an inner tube inserted into the outer tube with a gap therebetween, and a combustion chamber is formed in front of the burner nozzle. A first material formed of a conductive material and surrounding the combustion chamber.
And a metal second tube placed adjacent to the base end of the first tube, and the two tubes are detachably connected to each other. Radiant tube burner.