JPH06313519A - Combustion device - Google Patents

Abstract

PURPOSE:To prevent red heat of a thin side flame hole constituting body, in a combustion device of a thick/thin combustion system. CONSTITUTION:In a combustion pipe wherein a mixing chamber 2 is formed in the center area, thick gas chambers 3 are formed on both sides thereof, thin gas flame holes 5 are provided on the upper part of the mixing chamber by a thin side flame hole consituting body 4, thick flame holes 6 are provided on the upper part of the thick gas chamber, and a mixture supplying pipe 7 for supplying thick gas into the mixing chamber and the thick gas chamber and an air port 12 for taking air into the mixing chamber are provided, the upper part of the mixture supplying pipe is formed into a board shape so as to form a heat transfering part 13 extended to the thin side flame hole. Accordingly, red heat of the thin side flame hole constituting body 4 is prevented by the heat transfering part 13 so as not to back, thereby the combustion is stabilized, and the mixing is made good by partitioning the mixing chamber inside, moreover flames are stabilized by making the flow of thin gas good, so that the oscillating combustion is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rich / lean combustion type combustion device in which combustion is stabilized.

[0002]

2. Description of the Related Art As one of the conventional combustion systems, there is a rich-lean combustion system, which is effective for eliminating the local high temperature part of the flame and stabilizing the flame to reduce Nox. A combustion method in which this is composed of a metal plate has been proposed as a combustion device that can be manufactured at low cost and can be applied to various appliances. For example, as shown in FIGS. 3 and 4, the combustion pipe 21 has a mixing chamber 22 formed at the center and a rich gas chamber 23 formed on both sides thereof.
2 is provided with a light gas flame port 25 formed by the light side flame port structure 24, a rich gas flame port 26 is provided above the rich gas chamber 23, and the mixing chamber 22 and the rich gas chamber 23 are mixed with a high gas concentration. An air-fuel mixture supply pipe 27 for supplying air and an air port 28 for taking in air to the mixing chamber 22 are provided, and a light-side flame formed in the central portion is provided with a flame-holding effect of a rich-side flame formed on both sides. As a result, the light flame can be held and the combustion can be stabilized.

[0003]

However, since the heat transfer of the light-side flame mouth forming body forming the light-side flame mouth is poor, the light-side flame mouth constituting body becomes red-heated when burned for a long time, and it tends to back. Had a problem. In this case, as shown in FIG. 4, it may be possible to accelerate the cooling by increasing the dimension A of the light-side flame mouth structure, but this increase in size hinders the compactness of the combustion device and increases the cost. Is also connected.

According to the present invention, the upper part of the air-fuel mixture supply pipe is formed into a plate shape and extended to the light side flame opening, and the light side flame opening structure is divided into two parts so that the light side flame opening is cooled. An object of the present invention is to provide a combustion device in which combustion is stabilized by preventing red heat of the light-side flame nozzle structure.

[0005]

In order to achieve the above-mentioned object, the combustion apparatus of the present invention has a mixing chamber in the center and a rich gas chamber on both sides of the mixing chamber. The body has a light gas flame port and a rich gas flame port at the top of the rich gas chamber, and a mixture gas supply pipe for supplying rich gas to the mixing chamber and the rich gas chamber, and an air port for introducing air into the mixing chamber. In the combustion tube, the upper part of the air-fuel mixture supply tube is formed into a plate shape to form a heat transfer section extending to the light side flame mouth, and
It is something that is divided.

[0006]

[Operation] At the time of combustion, a light-side flame is formed by the light gas flame mouth at the center of the combustion tube, and a rich-side flame is formed by the rich gas flame mouth at both sides.
Due to this rich-lean combustion, the local high temperature part of the flame is eliminated to reduce the generation of Nox, and the lean-side flame stabilizes the combustion with the rich-side flames on both sides.

The light-side flame mouth structure is constructed such that the upper part of the air-fuel mixture supply pipe is formed into a plate shape and is divided into two parts by the heat transfer portion extending to the light-side flame mouth. Heat is transferred to the air-fuel mixture supply pipe and escapes, the light-side flame mouth component is cooled, and red heat is prevented.

Therefore, backing due to red heat is prevented and combustion is stabilized. Further, the mixing chamber can be partitioned so that the left and right are well mixed, and the flow of the light side gas is improved, which is effective in stabilizing the flame and preventing oscillating combustion.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a perspective view of a cross section of an essential part showing an embodiment of the present invention, and FIG. 2 is a cross sectional view of the essential part.

Reference numeral 1 denotes a combustion tube, which has a mixing chamber 2 formed at the center thereof and a rich gas chamber 3 formed on both sides thereof, and a light gas flame port 5 formed by a light side flame port structure 4 at the upper portion of the mixing chamber 2 and a rich gas chamber 3. A rich gas flame opening 6 is provided above the gas chamber 3.

Reference numeral 7 denotes a mixture gas supply pipe for supplying a mixture gas having a high gas concentration to the mixing chamber 2 and the rich gas chamber 3, and connecting the side wall with a projecting portion 8 projectingly formed at the lower portion of the side wall of the rich gas chamber 3 to form a rich side. The gas ejection hole 9 allows rapid communication with the rich gas chamber 3, and the projection 8
The concentrated gas is supplied to the air passage 10 formed between the two by the light side gas ejection holes 11 and mixed with the air flowing from the air inlet 12 for taking in the air through the air passage 10 into the mixing chamber 2,
It is designed to produce light gas.

Reference numeral 13 denotes a heat transfer section formed by extending the mixture gas supply pipe 7 to the light side flame port 5 by making the upper part thereof plate-like, and divides the light side flame port structure 4 into two parts.

With the above construction, the mixture gas supply pipe 7 is used during combustion.
The rich gas ejected from the light-side gas ejection holes 11 of No. 1 is mixed with the air flowing through the air passage 10 to generate a fresh gas having a high excess air ratio in the mixing chamber 2, and ejected and burned from the fresh gas flame port 5. A light flame is formed in the central part. Further, the rich gas having a low excess air ratio supplied to the rich gas chamber 3 from the rich gas outlet 9 is
The rich gas flame outlet 6 burns to form rich flames on both sides, and the flame holding effect stabilizes the light flames. Due to this light and dark combustion, the occurrence of local high temperature parts is eliminated and low Nox
Turn into.

Further, since the plate-shaped heat transfer portion 13 formed on the upper portion of the air-fuel mixture supply pipe 7 is extended to the light side flame opening 5, the light side flame opening structure 4 is divided into two parts. The heat of the light flame side 5 is transferred to the air-fuel mixture supply pipe 7 and escapes, the light flame side structure 4 is cooled, red heat is prevented, and back due to red heat is prevented to stabilize combustion.

Further, the mixing chamber 2 is partitioned by the heat transfer section 13, and the mixing action is performed in each of the left and right mixing chambers 2 to improve the mixing. Further, the flow of the light gas becomes smooth, and the flame can be stabilized and the oscillatory combustion can be prevented.

[0016]

As described above, according to the present invention, the upper portion of the air-fuel mixture supply pipe is formed into a plate shape to form the heat transfer section extending to the light side flame opening, and the light side flame opening structure is divided into two parts. Since it is cooled by cooling, red heat of the light-side flame mouth structure is prevented, the back can be eliminated, and combustion is stabilized.

Further, the heat transfer section can partition the mixing chamber,
It improves mixing and improves the flow of light gas, which is effective for flame stabilization and oscillatory combustion.

[Brief description of drawings]

FIG. 1 is a cross-sectional perspective view of an essential part showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view of main parts of the same example.

FIG. 3 is a cross-sectional perspective view of a main part showing a conventional example.

FIG. 4 is a cross-sectional view of main parts of the same example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Combustion pipe 2 Mixing chamber 3 Rich gas chamber 4 Light side flame mouth structure 5 Light gas flame mouth 6 Rich gas flame mouth 7 Mixture supply pipe 12 Air port 13 Heat transfer part

Claims (1)

[Claims] 1. A mixing chamber is formed in the center, and a rich gas chamber is formed on both sides of the mixing chamber. A light gas flame port is provided at the upper part of the mixing chamber by a light side flame port structure, and a rich gas flame port is provided at the upper part of the rich gas chamber. Together with a gas mixture supply pipe for supplying a rich gas to the mixing chamber and the rich gas chamber,
In the combustion tube provided with an air port for taking air into the mixing chamber, the upper part of the air-fuel mixture supply tube is formed into a plate shape to form a heat transfer section extending to the light side flame opening, and the light side flame opening structure is divided into two parts. Combustion device characterized in that