JPH0249450Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention consists of a part of the material such as the combustion ring housed inside the combustion burner made of a material with a low coefficient of thermal expansion such as ceramic, and has a mounting structure that does not cause damage. This is related to.

[Conventional technology]

The combustion ring and other materials housed inside the combustion burner are usually made of metal (mainly heat-resistant stainless steel), and the mounting structure is mostly spot welded.

[Problem that the invention attempts to solve]

The inside of a combustion burner is in a high-temperature atmosphere of 900℃ to 1000℃, so the combustion ring, etc. stored inside this burner is constantly exposed to high temperatures. The condition is such that thermal deformation is likely to occur, and once thermal deformation occurs, it does not return to its old shape, resulting in a problem of poor combustion performance.

[Structure of the idea]

To explain the configuration with reference to the actual drawings, 1 is a combustion burner, 2 is a combustion ring that is housed in the combustion burner 1 and improves the balance of combustion, and the material of the combustion ring 2 is a ceramic material 2' with a low coefficient of thermal expansion. It is formed by The ceramic material 2' is sandwiched between upper and lower plates 3 and 4 made of a metal material having a higher coefficient of thermal expansion than the ceramic material 2'. And the upper plate 3 has a vertical piece 3'
and a horizontal surface 3'', and the lower plate 4 is a flat plate and forms an upward rib 4'. 2'' is an inclined part provided on the lower end surface of the ceramic material 2', and the lower plate 4 is a flat plate and forms an upward rib 4'. When the ceramic material 2' is tightly attached, the inclined portion 2'' is in contact with the rib 4' of the lower plate 4. In the figure, 5 is an ignition heater that is visible at the bottom of the combustion burner 1, and 6 is the same. a fuel supply pipe that sends fuel into the combustion burner 1;
Reference numeral 7 designates an outer shell surrounding the outside of the combustion burner 1, and reference numeral 8 designates an air passage that sends air necessary for combustion to the combustion burner 1.

[Effect of invention]

In the present invention having the above configuration, when fuel and combustion air are supplied into the combustion burner 1, combustion is performed continuously in the combustion burner 1, and the combustion ring 2 improves the mixing balance of the fuel and air. This is to ensure stable combustion. In the present invention, the combustion ring 2 is formed of a ceramic material 2', and the ceramic material 2' is held by the upper and lower plates 3 and 4 made of metal materials. Otherwise, metal materials have a high coefficient of thermal expansion, so the upper plate 3 will extend in the y direction (vertical direction), and the lower plate 4 will extend in the x direction (horizontal direction).
However, in the present invention, a sloped portion 2'' is provided on the lower end surface of the ceramic material 2', and the sloped portion 2'' is connected to the rib of the lower plate 4. 4', when the lower plate 4 extends in the x direction, the ribs 4' slightly lift the inclined portion 2'' of the ceramic material 2', while the upper plate 3 extends in the y direction, so the ceramic material 2' Even if the ceramic material 2' is lifted, the stress in the upper and lower plates 3 and 4
It falls short of that.

[Effect of idea]

In order to hold the ceramic material 2', it is necessary to use a metal material with good workability, but since the coefficient of thermal expansion is different between the ceramic material and the metal material, the stress of the material with a large coefficient of expansion acts on the ceramic material. Ceramic materials tend to crack.

In the present invention, the upper plate 3 made of a metal material is provided with a vertical piece 3', so the direction in which it expands due to heat is the y direction.
Since the lower plate 4 is a flat plate, it has the characteristic of extending in the x direction, and the lower end surface of one ceramic material 2' is provided with an inclined part 2'', so that when the lower plate 4 extends in the x direction, the ribs of the lower plate 4 4' lifts the ceramic material 2' in the y-direction and the upper plate 3 extends in the y-direction, so even if the ceramic material 2' is lifted, it will absorb the lifting amount and cause the ceramic material 2' to be distorted. Never.

In other words, the present invention does not cause any damage due to thermal distortion even when dissimilar materials are bonded together at high temperatures, so it is ideal for using ceramic materials with high heat resistance as parts.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the main part of the product of the present invention, and FIG. 2 is a diagram showing the main part in use. 1... Combustion burner, 2... Combustion ring, 2'...
...ceramic material, 2''...slanted part, 3...top plate,
3'...Vertical piece, 3''...Horizontal surface, 4...Lower plate,
4'...Rib.

Claims (1)

[Scope of utility model registration request] The combustion ring 2 housed in the combustion burner 1 is made of a ceramic material 2' with a low coefficient of thermal expansion, and the ceramic material 2' is sandwiched between upper and lower plates 3 and 4 made of metal materials with a high coefficient of thermal expansion. The upper plate 3 is a vertical piece 3'
and a horizontal surface 3'', the lower plate 4 is a flat plate and forms an upward rib 4', while the upper and lower plates 3, 4
A mounting structure for a combustion ring made of a material with a low thermal expansion coefficient is provided with an inclined portion 2'' on the lower end surface of the ceramic material 2' which comes into contact with the rib 4' when the ceramic material 2' is tightly attached.