JP3237281B2 - High temperature radiator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[Object of the invention]

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-temperature radiator, and is used for a combustor of an external combustion engine such as a Stirling engine, and a heater such as a radiant tube of a heating system for an annealing and pickling line of a stainless steel body. You.

[0003]

2. Description of the Related Art Conventionally, as a high-temperature radiator of this kind,
The Nippon Metal ceramics radiant tube shown in "NIKKEI NEW MATERIALS No. 1992.10.26" is known.

This has a cylindrical main body formed of ceramics such as silicon carbide, and a flame outlet formed on the surface of the main body and for blowing out a flame to a body to be heated adjacent to the surface of the main body. In such a case, a burner or the like is arranged at one end of the main body and heated, and the heat is transmitted to the object to be heated.

[0005]

However, in the above-described high-temperature radiator, since the temperature of the main body surface is lowered by natural cooling, it is impossible to rapidly lower the temperature of the main body surface.

Further, since the main body has an elongated shape, it is necessary to make the flame of a burner or the like large (strong) in order to equalize the temperature inside the main body. Therefore, when the flame is increased, the temperature inside the main body becomes too high, so that silicon carbide constituting the main body is easily oxidized, and part of the silicon carbide is oxidized to silicon dioxide. Since this silicon dioxide has poor heat resistance, the strength of the main body is reduced and the life of the high-temperature radiator is shortened.

SUMMARY OF THE INVENTION Accordingly, it is a technical object of the present invention to quickly lower the temperature of the main body surface and to suppress the temperature inside the main body from excessively rising when the flame is increased. .

[0008]

Configuration of the Invention

[0009]

The technical means (first technical means) employed in the first aspect of the present invention for solving the above technical problem has a cylindrical shape, and the inside is heated and the heat is generated. And a body for transmitting to a heated body disposed around the body.
It has an air hole formed in the wall of the main body so as to penetrate in the longitudinal direction of the main body, and an air inlet formed in the middle of the air hole for introducing air at least inside the main body. It is.

[0010] In order to solve the above technical problem, a second aspect is provided.
Technical measures taken in the invention of the above (second technical means)
Has a plurality of divided pieces having a cylindrical shape, and an air hole for flowing air formed in the wall of the divided piece so as to penetrate in the longitudinal direction of the divided piece, a through hole communicating with the air hole, and At least an air inlet for introducing air into the divided pieces is provided, and a connecting pipe for connecting the divided pieces to each other is provided.

[0011]

According to the first technical means, an air hole for flowing air is formed in the wall of the main body so as to penetrate in the longitudinal direction of the main body, and the air introduction for introducing air into at least the inside of the main body. Since the opening is formed in the middle of the air hole, the inside of the main body and the surface of the main body are forcibly cooled by the air flowing through the air hole and the air introduced from the air inlet.

As a result, the temperature of the main body surface drops quickly.

Also, even when a strong flame is applied to the inside of the main body to equalize the temperature inside the main body, the inside of the main body is cooled by the air flowing through the air holes and the air introduced from the air inlet. Therefore, it is possible to suppress the temperature inside the main body from excessively rising. As a result, the material constituting the main body is hardly oxidized, the strength of the main body is secured, and the life of the high-temperature radiator is improved.

[0014] The second technical means has the same function as the first technical means.

[0015]

An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a perspective view of the high-temperature radiator according to the first embodiment, and FIG. 2 is a sectional view of the main body in FIG.

In the high-temperature radiator 10 shown in FIG. 1, the cylindrical main body 11 is formed of a ceramic material having a small heat capacity and a high thermal conductivity, such as silicon carbide.
Are formed with a plurality of flame outlets 12. The radiant heat of the main body 11 is transmitted to a heated body (not shown) such as a heater tube arranged around the main body 11. A heating means (not shown) such as a burner is connected to the left end in the figure of the main body 11 so as to apply a flame to the inside of the main body 11.

As shown in FIG. 1 and FIG.
A plurality of air holes 13 are formed in the wall 11a so as to penetrate in the longitudinal direction of the main body 11, and air is supplied to these air holes 13 from air supply means (not shown) located at the left end in the figure. It is supposed to be. In the middle of the air hole 13, a plurality of air introduction ports 14 are formed so as to open toward the inside of the main body 11, and air is introduced into the inside of the main body 11.

In FIG. 2, the air inlet 14 is open toward the inside of the main body 11, but it is not limited to this. In addition, the air inlet 14 extends toward the outer periphery of the main body 11. You may make it open.

The operation of the high-temperature radiator 10 configured as described above will be described.

When a flame is applied to the inside of the main body 11 by a heating means, radiant heat is transmitted to the object to be heated via the surface of the main body 11. Here, in order to equalize the temperature inside the main body 11, it is necessary to apply a strong flame to the inside of the main body 11.
When a strong flame is applied to 1, air is supplied to the air holes 13 and the air flowing through the air holes 13 mainly cools the surface of the main body 11 and the vicinity of the inner peripheral surface of the wall 11 a. The air flowing through the air holes 13 is supplied to the main body 11 through the air inlet 14.
The inside of the main body 11 is cooled by the air. As a result, it is possible to suppress the temperature inside the main body 11 from excessively rising, it is difficult for silicon carbide constituting the main body 11 to be oxidized, the strength of the main body 11 is secured, and the life of the high-temperature radiator 10 is improved. On the other hand, when the heating of the inside of the main body 11 is completed, a large amount of air is supplied to the air holes 13, and a part of the air is introduced into the inside of the main body 11 through the air inlet 14. As a result, the inside of the main body 11 and the surface of the main body 11 are forcibly cooled by the air flowing through the air holes 13 and the air introduced from the air inlet 14. Therefore, the temperature of the surface of the main body 11 drops quickly.

FIG. 3 is a sectional view of a high-temperature radiator according to the second embodiment.

In the high-temperature radiator 20 shown in FIG. 3, a main body 21 is formed by connecting a plurality of (four in FIG. 3) cylindrical divided pieces 22 having the same outer diameter. Split piece 2
Numeral 2 is formed from ceramics such as silicon carbide, and a plurality of flame outlets (not shown) are formed on the surface of divided piece 22. The radiant heat of the split piece 22 is transmitted to a heated body (not shown) such as a heater tube arranged around the split piece 22.

As shown in FIG. 3 and FIG.
A plurality of air holes 23 are formed in the second wall so as to penetrate in the left-right direction in the figure, and correspond to the air holes 23 of the adjacent divided pieces 22.

As shown in FIG. 3, a plurality of divided pieces 22
Are connected via a T-shaped tube (connecting tube) 24, and the T-shaped tube 24 is formed of ceramics such as silicon carbide. As shown in FIG. 5, the T-tube 24 is inserted between the adjacent air holes 23 and the adjacent air holes 2 are sintered.
Three comrades are united together. Here, before sintering, T-tube 2
4 and the air holes 23 of the split pieces 22 are coated with a ceramic paste of the same material, or the density of the compact of the T-tube 24 is slightly increased from the density of the compact of the split pieces 22. It is preferable to make the contraction rate of the T-tube 24 smaller than the contraction rate of the divided piece 22. This allows
During sintering, the T-tube 24 and the split pieces 22 are firmly connected, and the adjacent split pieces 22 are firmly connected.

As shown in FIG. 5, a through-hole 24a communicating with the air hole 23 is formed in the T-tube 24, and is opened in the middle of the through-hole 24 toward the inside of the main body 21. Is formed with an air inlet 24b. Air is introduced into the main body 21 by the air introduction port 24b.

In this embodiment, the T-shaped tube 24 is used. However, the present invention is not limited to this.
A cross tube or the like may be used.

In FIG. 3, the air inlet 24b is opened toward the inside of the main body 21. However, the air inlet 24b is not limited to this. It may be opened.

The operation of the high-temperature radiator 20 configured as described above is basically the same as the operation of the high-temperature radiator 10 of the first embodiment, and a description thereof will be omitted.

[0030]

The present invention has the following effects.

The temperature of the main body surface of the high-temperature radiator can be rapidly lowered.

Further, the temperature inside the main body can be prevented from rising too much, the material constituting the main body is hardly oxidized, the strength of the main body is secured, and the life of the high-temperature radiator is improved.

[Brief description of the drawings]

FIG. 1 is a perspective view of a high-temperature radiator according to a first embodiment.

FIG. 2 is a sectional view of a main body in FIG.

FIG. 3 is a sectional view of a high-temperature radiator according to a second embodiment.

FIG. 4 is a sectional view of a divided piece.

FIG. 5 is an enlarged view of a portion A in FIG. 3;

[Explanation of symbols]

 10, 20 High-temperature radiator 11, 21 Main body 11a Main body wall 13, 23 Air hole 14 Air inlet 22 Split piece 24 T-shaped tube (connecting pipe) 24a Through hole 24b Air inlet

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Junichi Mita 2-1-1 Asahimachi, Kariya City, Aichi Prefecture Aisin Seiki Co., Ltd. Examiner Katsuyuki Higashi (56) References JP-A-5-39909 (JP, A) JP-A-61-140711 (JP, A) JP-A 50-23746 (JP, U) JP-A 37-6896 (JP, Y1) (58) Fields investigated (Int. Cl. ⁷ , DB name) ) F23D 14/12 F23C 3/00 301

Claims (2)

(57) [Claims] 1. A main body having a cylindrical shape, the inside of which is heated and which transmits the heat to an object to be heated disposed around the main body, and formed on a wall of the main body so as to penetrate in a longitudinal direction of the main body. A high-temperature radiator, comprising: an air hole for flowing air; and an air inlet formed in the middle of the air hole for introducing air into at least the inside of the main body. 2. A plurality of divided pieces having a cylindrical shape and divided; an air hole formed in a wall of the divided piece so as to penetrate in a longitudinal direction of the divided pieces; and an air hole; A high-temperature radiator comprising: a through-hole communicating with a hole; and an air inlet for introducing air into at least the inside of the divided pieces, and a connecting pipe connecting the divided pieces to each other.