JPH0719423A - Burner - Google Patents

Abstract

PURPOSE:To stabilize burning by providing oppositely at right and left sides and separately under both thin and thick side combustion tubes a throat of the thin side combustion tube having a thin side burner port at an upper surface and a common throat of a pair of the thick side combustion tubes so mounted that thick side burner ports are disposed at both sides of the thin side port. CONSTITUTION:A thin side combustion tube 1 has a throat 3 having an inlet 2 at a lower center and disposed at one side, a thin side passage 4 formed therein, and a thin side burner port 5 provided at an upper surface. Thick side burner ports 10 are disposed at both sides of the port 5, a pair of thick side combustion tubes 5 are provided, a throat 8 having an inlet 7 is provided at a lower center to form a thick side passage 9. The throat 8 of the tube 6 is disposed oppositely to the throat 3 of the tube 1 at the other side. With this structure, the throats 3, 8 can be reduced in width, suction of primary air, flow of mixed gas are improved, mixing of thick and thin gases is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion apparatus of a rich and lean combustion type.

[0002]

2. Description of the Related Art Conventionally, there is a rich / lean combustion method as one of combustion methods designed to reduce NOx. In a burner realized by a combustion tube method of a metal plate, as shown in FIGS. In addition, the combustion pipe 21 has a dense passage 22 inside to accommodate the internal combustion pipe 23, and the inside of the internal combustion pipe 23 has a light passage 24.
And had a double structure. At the inlet 26 of the slot portion 25 of the internal combustion pipe 23, the gas ejected with the nozzle 27 facing is mixed with the primary air at the slot portion 25 to generate a light gas having a high excess air ratio. The light is supplied to the light side flame holes 28 provided on the upper surface. Further, the gas ejected with the nozzle 31 facing the inlet 30 of the slot portion 29 of the combustion pipe 21 and the primary air are mixed in the slot portion 29 to generate a concentrated gas having a low excess air ratio. And is supplied to the dark side flame holes 32 provided on both sides of the light side flame hole 28 on the upper surface. The amount of primary air on the light side and the amount on the dark side are adjusted by mounting the damper 33 and adjusting the hole diameter. In this way, the combustion pipe has a dual structure of the light side passage and the dark side passage to burn the light and shade.

[0003]

As described above, in the conventional burner of the combustion tube system, in which both the dark and light slots are jetted from the respective nozzles to mix them, The entire combustion pipe has a double structure, the structure is complicated and the width of the combustion pipe becomes large, and the outer slot portion 29 makes the inside thereof an ideal venturi-shaped flow path. Therefore, there is a problem in that the introduction of the primary air is hindered and the flow of the mixed gas is disturbed.

It is an object of the present invention to provide a combustion device having a simple structure, good mixing of rich and dark gases, and stable combustion.

[0005]

In order to achieve the above object, the combustion apparatus of the present invention has a slot portion of a light side combustion pipe having a light side flame hole provided on the upper surface thereof, which is arranged on one side below. , The slot part common to the pair of rich side combustion pipes installed so that the dense side flame holes are provided on both sides of the light side flame hole is arranged on the other side facing the slot part of the lean side combustion pipe. However, the light-side and dark-side slot portions are separately provided.

[0006]

Since the slot portions of the light-side combustion tube and the rich-side combustion tube are separately provided facing the left and right below both combustion tubes, the structure is simplified and the assemblability is improved, and the slot portion is provided. Can be narrowed and an ideal venturi-like flow path can be formed, so that the intake of the primary air, the flow of the mixed gas and the mixing of the gas can be improved, and the combustion is stabilized.

[0007]

1 is a perspective view showing an embodiment of the present invention, FIG.
FIG. 4 is an exploded perspective view of a light side combustion pipe and a rich side combustion pipe.

Reference numeral 1 is a light side combustion pipe, and a slot portion 3 having an inlet 2 in the lower central portion is arranged on one side, and a light side passage 4 is provided inside.
And the light side flame holes 5 are provided on the upper surface. Reference numeral 6 denotes a pair of rich side combustion pipes, and a slot portion 8 having an inlet 7 at a lower central portion is arranged on the other side so as to face the slot portion 3 of the lean side combustion pipe 1 and is arranged on the other side. 9 are formed on the both sides of the dark side combustion pipe 6 so as to accommodate the flame hole portion of the light side combustion pipe 1 inside, and the rich side flame hole 10 is provided on the upper surface. Therefore, the slot portion 3 of the light side combustion pipe 1 is provided with the slot portions 8 of the rich side combustion pipe 6 separately separately on the left and right sides, and the rich side combustion pipe 6 forming the rich side passage 9 is provided in It is attached to the outside of the side combustion pipe 1, and a light side flame hole 5 is provided at the center, and rich side flame holes 10 are provided on both sides of the light side flame hole 5 so that the light and dark combustion is performed.

With the above structure, the fresh gas produced in the slot portion 3 of the lean side combustion pipe 1 is supplied to the lean side flame hole 5 on the upper surface and produced in the slot portion 8 of the rich side combustion pipe 6. The rich gas is
It is supplied to the dark side flame hole 10 on the upper surface, and a dark side flame is formed at both sides of the light side flame at the center. Since the dark side and the light side slot portions 3 and 8 are separately provided on the left and right sides, the structure is simple and the assemblability is improved, and the width of the slot portion can be reduced, so that the intake of the primary air, It is possible to improve the flow of the mixed gas, improve the mixing of the gas on both the dark side and the light side, and stabilize the combustion.

[0010]

As described above, according to the present invention, since the slots of the light combustion tube and the rich combustion tube are separately provided so as to face downward and to the left and right, the slot has a double structure. The structure is simplified and the assemblability is improved, and the width of the slot portion can be reduced to improve the intake of primary air, the flow of mixed gas, the mixing of gases, and the stabilization of combustion. .

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is an exploded perspective view of a light side combustion pipe and a rich side combustion pipe of the same example.

FIG. 3 is a perspective view showing a conventional example.

FIG. 4 is a sectional view taken along line AA of the same example.

FIG. 5 is a cross-sectional view of essential parts showing a slot portion of the same example.

[Explanation of symbols]

 1 Light Side Combustion Pipe 3 Slot Section 4 Light Side Passage 5 Light Side Flame Pore 6 Thick Side Combustion Pipe 8 Slot Section 9 Thick Side Passage 10 Thick Side Flame Pore

Claims (1)

[Claims] 1. A pair of light-side combustion tubes having light-side flame holes formed on the upper surface, the slot portion being disposed on one lower side, and having the dark-side flame holes provided on both sides of the light-side flame holes. In this case, the common slot portion of the rich side combustion pipe is arranged on the other side facing the slot portion of the light side combustion tube, and the slow side portion of the light side and that of the rich side are separately provided. Characteristic combustion device.