JPH018831Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a combustion tube with improved turndown characteristics.

(Prior art) In the past, combustion pipes were, for example,
It is known in No.

However, the combustion tube shown in this publication does not use an outer plate that does not come into contact with the flame and allows secondary air to flow sufficiently toward the base of the flame.

(Problems to be Solved by the Invention) The present invention solves the above-mentioned conventional problems and provides a combustion tube that is durable and has an outer plate to allow sufficient flow of secondary air toward the base of the flame. purpose.

(Means for Solving the Problems) In order to achieve the above object, the present invention includes a fuel passage connected to a fuel supply source and opening at a flame hole at the top of the main body, and an inner plate attached to the side wall of the main body. , an outer plate whose upper end is positioned downward to the extent that it does not contact the flame on the outside of the inner plate, and whose upper part is bent toward the base of the flame, and an outer plate formed between the outer plate and the inner plate and located downward. an air passage that opens on the side of the main body and opens upward toward the flame hole; a decompression chamber formed between the inner plate and the side wall of the main body and opens upward toward the flame hole; and the reduced pressure A combustion tube is proposed consisting of a hole in the body which communicates the chamber with the fuel passage.

(Function) The combustion tube of the present invention has the structure described in the claims for utility model registration, and in particular, the air is formed between the outer plate and the inner plate attached to the side wall of the main body and opens toward the flame hole. Since the combustion flame has a passage, sufficient secondary air is supplied to the combustion flame, and as a result, it is possible to reduce the amount of primary air during low combustion and achieve stable combustion (good turndown characteristics).The combustion tube of the present invention has the same configuration as above, and in particular, secondary air is supplied to the flame hole through the air passage, and tertiary air is supplied from the surroundings, that is, air is supplied in stages, so that the combustion noise is quiet.

The combustion tube of the present invention has the same structure as above, and in particular, the outer plate has durability because the upper end of the outer plate is positioned downward to such an extent that it does not come into contact with the flame.

The combustion tube of the present invention has the same structure as above, and in particular, the upper part of the outer plate is bent toward the base of the flame, so that sufficient secondary air flows toward the base of the flame, resulting in improved turndown characteristics. Ru.

(Example) The combustion tube of the present invention will be described below according to an example shown in the drawings.

1 and 2 show a combustion tube of the present invention, which is connected to a fuel supply source 3 such as gas, and is connected to a main body 1.
It has a fuel passage 2 formed therein.

The fuel passage 2 opens at a flame hole 4 at the top of the body 1.

Next, an outer plate 5 and an inner plate 6 are attached to the side wall of the main body 1, with an air passage 7 formed therebetween (in the illustrated embodiment, the outer plate 5 is attached to the side wall of the main body 1 at the bent piece 5a). welded).

The upper end of the outer plate 5 is positioned below to the extent that it does not come into contact with the flame.

Further, the upper part of the outer plate 5 is bent toward the base of the flame so that secondary air can flow sufficiently toward the flame.

The air passage 7 opens to the side of the main body 1 at the bottom and opens toward the flame hole 4 at the top.

Next, a decompression chamber 8 is provided between the inner plate 6 and the side wall of the main body 1.
The decompression chamber 8 communicates with the fuel passage 2 through a hole 9 in the main body 1 and opens upward toward the flame hole 4.

The operation of the combustion tube of the present invention shown in the above embodiments will be described below.

That is, fuel such as gas is mixed with primary air and supplied to the fuel path 2 from the fuel supply source 3 .

The fuel is ejected from the flame hole 4, ignited, and combusted to form a main flame 12.

Further, the fuel passes through the hole 9 and the decompression chamber 8, and is also ejected from the upper opening to form a flare 13.

On the other hand, secondary air is sucked in from below the air passage 7, flows upward, and is supplied toward the flame hole 4.

Therefore, sufficient secondary air is supplied to the fuel flame, making it possible to reduce the amount of primary air.

In other words, stable combustion can be achieved by reducing the amount of primary air during low combustion.

(Effects of the invention) The embodiments of the combustion tube of the invention are as described above, and the effects thereof are listed below.

(1) The combustion tube of the present invention has the configuration described in the claims for utility model registration, and in particular, the air is formed between the outer plate and the inner plate attached to the side wall of the main body and opens toward the flame hole. Since the combustion flame has a passage, sufficient secondary air is supplied to the combustion flame, and as a result, the amount of primary air can be reduced during low combustion to achieve stable combustion (good turndown characteristics). (2) This invention The combustion tube has the same configuration as above, especially 2
Secondary air is supplied to the flame hole through the air passage, and tertiary air is supplied from the surrounding area, that is, air is supplied in stages, so combustion noise is quiet.

(3) The combustion tube of the present invention has the same structure as above, and in particular, the outer plate has durability because the upper end of the outer plate is positioned downward to the extent that it does not come into contact with the flame.

(4) The combustion tube of the present invention has the same structure as above, and in particular, the upper part of the outer plate is bent toward the base of the flame, so that sufficient secondary air flows toward the base of the flame, resulting in poor turndown characteristics. More improved.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the combustion tube of the present invention, and FIG. 2 is a sectional view of FIG. 1. 1: Main body, 2: Fuel path, 3: Fuel supply source, 4:
Flame hole, 5: outer plate, 5a: bent piece, 6: inner plate, 7: air passage, 8: decompression chamber, 9: hole, 12: main flame, 13: side flame.

Claims (1)

[Scope of utility model registration request] a fuel passage connected to a fuel supply source and opening at a flame hole at the top of the main body; an inner plate attached to a side wall of the main body; An outer plate whose upper part is bent toward the base of the flame, and an air passage formed between the outer plate and the inner plate and which opens to the side of the main body at the bottom and opens toward the flame hole at the top. a combustion tube comprising: a decompression chamber formed between the inner plate and the side wall of the main body and opening upward toward the flame hole; and a hole in the main body that communicates the decompression chamber with the fuel passage.