JP2002048312A - Combustion apparatus and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To develop a combustion apparatus which is easy in assembling and which adopts a thick/thin combustion system. SOLUTION: Developed configurations of plate structures 15 to 18 are pressed on one plate. Then, plate structures 16, 17 formed outside are folded to the inside, and the plate structure 16 and the plate structure 15 are joined by caulking. Likewise, the central plate structure 17 and the adjacent outside plate structure 18 are also joined by caulking. Finally, the plate structures 15, 18 are folded therebetween, and 4 members are integrally caulked and are protruded toward the intermediate portion of the central plate structures 16, 17.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a combustion apparatus, and more particularly to a combustion apparatus having a structure in which metal plates are stacked.

[0002]

2. Description of the Related Art As a method of burning fuel gas in a lean state, a lean-burn method is known. Here, the gray-scale combustion method is a combustion method in which a main flame generated from a low-concentration combustion gas is made adjacent to a supplementary flame in which a high-concentration combustion gas is burned. 2. Description of the Related Art As a combustion apparatus of a concentration combustion system used for a water heater or the like, an apparatus in which metal plates are stacked and a gas flow path is formed by these gaps is known. Most of the conventional combustion devices of this type are formed by stacking six metal plates. The two central plates constitute a fresh gas passage through which low-concentration combustion gas passes. Each sheet forms a dense gas flow path through which a high-concentration fuel gas passes. The two center metal plates are joined together by spot welding, and the two side metal plates are also joined together by spot welding. Finally, each of the welded metal plates is overlaid to complete the combustion device.

[0003]

However, in the combustion apparatus employing the lean-burn method, the combustion gas in an incompletely burned state is emitted from the opening for the main flame at the time of ignition, and the gas smells. There was a problem. Therefore, the present inventors made the length of the rich gas flow path shorter than that of the light gas flow path, injected the rich gas first from the flame hole at the time of ignition, stabilized the supplementary flame first, and incompletely A combustion device has been developed to prevent the emission of combustion gas in a combustion state (Japanese Patent Application No. 2000-1970074).
The combustion apparatus of Japanese Patent Application No. 2000-1970074 described above is:
It is a stack of four metal plates, and a light gas flow path is formed by two central metal plates, and a rich gas flow channel is formed by the outer surface of the two central metal plates and the inner surface of the outer metal plate. Are formed. The present inventors have disclosed in Japanese Patent Application No. 2000-19.
The combustion device disclosed in No. 7074 was manufactured by the same process as the conventional one. That is, as shown in FIG. 16, first, four independent plate members 100 to 103 are pressed and formed. Then, the main structural member 105 is manufactured by stacking the two central plate members 101 and 102. Plates 101 and 102 were joined by spot welding. Thereafter, the outer plates 100 and 103 are overlapped, and these are spot-welded to the main component 105.

[0004] However, in this method, four independent plate members are stacked, so that it is difficult to perform positioning and the like. Further, in the above-described method, the step of performing spot welding must be interposed between the pressing step and the bending step of the plate body, and the manufacturing line lacks consistency. Therefore, there was dissatisfaction that assembly took time.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to develop a combustion device which is easy to assemble, focusing on the above-mentioned problems of the prior art.

[0006]

According to a first aspect of the present invention, there is provided a main flame hole for injecting a fuel gas having a low concentration and linearly, and both sides of the main flame hole. In a combustion device having an auxiliary flame hole which is adjacent to the surface and injects a fuel gas having a higher concentration than the fuel gas injected from the main flame hole, a single plate formed in a predetermined shape is divided into four parallel plates. It is composed of four walls that are folded into two. A light gas flow path that supplies fuel gas to the main flame hole is formed between the two central walls, and the two central walls and the The combustion device is characterized in that a concentrated gas flow path for supplying fuel gas to the auxiliary flame hole is formed between adjacent outer wall portions.

According to the combustion apparatus of the present invention, the combustion apparatus of the present invention injects a main flame hole for injecting a low-concentration fuel gas and a fuel gas having a higher concentration than the fuel gas injected from the main flame hole. This is a combustion device having an auxiliary flame hole that realizes rich and light combustion. The combustion device of the present invention is constituted by four wall portions obtained by folding a single plate formed into a predetermined shape into four in parallel, and is provided between two central wall portions. A lean gas flow path for supplying a fuel gas to the main flame hole is formed. A dense gas flow path for supplying fuel gas to the auxiliary flame hole is formed between the two central walls and the outer wall adjacent thereto. As described above, since the combustion device of the present invention is manufactured by folding one plate, positioning is easy.

According to a second aspect of the present invention, there is provided a main flame hole which linearly extends and injects a low-concentration fuel gas, and a fuel gas which is adjacent to both side surfaces of the main flame hole and is injected from the main flame hole. In a combustion device having an auxiliary flame hole for injecting fuel gas having a high concentration, a lean gas composed of four walls and supplying fuel gas to the main flame hole between two central wall portions A flow path is formed, and a concentrated gas flow path for supplying fuel gas to the auxiliary flame hole is formed between the two central walls and the outer wall adjacent thereto, and further, the two central walls are formed. And the adjacent outer wall portion is fitted and connected to each other at a fitting portion.

[0009] The combustion apparatus of the present invention is also similar to the above-described invention.
This is to realize light and shade combustion. Further, in the combustion device of the present invention, the center two walls and the adjacent outer wall are connected by a fitting structure. That is, since there is a portion in contact with each other between the two central wall portions and the adjacent outer wall portions, they can be fitted by caulking between them. In the combustion device of the present invention, since the plate members are joined by the fitting structure, the welding process is not inserted in the middle of the assembling process. This creates consistency on the production line and speeds up assembly.

[0010] The invention according to claim 3 is the combustion apparatus according to claim 1 or 2, wherein the fitting portion protrudes toward two central wall portions.

[0011] In the combustion device of the present invention, the fitting portion protrudes toward two central wall portions. That is, in the combustion device of the present invention, a protrusion having a fitting structure appears on the lean gas flow path side. As a result, turbulence occurs in the lean gas, which promotes agitation between the fuel gas and the air, and stabilizes the flame.

The invention according to claim 4 is the combustion apparatus according to any one of claims 1 to 3, wherein the fitting portion is provided near the flame hole.

The present invention has the function of preventing deformation near the flame hole. That is, the vicinity of the flame hole is easily exposed to high temperature and easily deformed. Therefore, in the present invention, the fitting portion is provided near the flame hole, and the vicinity of the flame hole is firmly fixed to prevent deformation.

According to a fifth aspect of the present invention, a projection is provided on the outside of the center two walls or on the inside of the outer wall adjacent thereto, and the projection comes into contact with the other wall. A combustion device characterized in that a gap between the wall portions is ensured by using the same.

In the combustion apparatus of the present invention, a projection is provided outside the central two wall portions or inside the outer wall portion adjacent thereto, and the projection is in contact with the other wall portion. Therefore, a gap between the wall portions is reliably ensured, and the supplementary flame is not interrupted.

According to a sixth aspect of the present invention, there is provided a step of forming the four wall portions by pressing, and caulking and fitting a plate portion disposed at the center and a plate portion disposed adjacent to the outside. The method for manufacturing a combustion device according to any one of claims 1 to 5, further comprising a step of joining and joining and a step of joining by overlapping four walls in a state where both are fitted.

The combustion apparatus of the present invention includes a step of caulking and fittingly joining a plate disposed at the center and a plate disposed adjacent to the outside. That is, in the combustion device of the present invention, a part corresponding to the sub-structure is manufactured first, and then a part corresponding to the main structure is manufactured. As described above, there is a portion that is in contact with each other between the central two wall portions and the adjacent outer wall portions, so that they can be fitted by caulking between them. Contrary to the method of the present invention,
If the center plate is joined first, when joining the two center walls and the adjacent outer wall, it will be necessary to place In some cases, a hollow portion is interposed, and the joining operation becomes difficult. In the combustion device of the present invention, since the plate members are joined by the fitting structure, the welding process is not inserted in the middle of the assembling process. This creates consistency in the production line, and assembles it faster. .

[0018]

Embodiments of the present invention will be described below. FIG. 1 is an explanatory diagram showing a combustion device and a manufacturing process thereof according to an embodiment of the present invention. FIG. 2 is an explanatory view showing a combustion apparatus according to another embodiment of the present invention and a manufacturing process thereof.

The combustion apparatus 1 of the present embodiment is composed of four plates 15, 16, 17, and 18, as shown in FIG. Of these, the central plates 16 and 17 constitute a main component, and a light gas passage 28 is formed between the two. A main flame hole (not shown) is provided in the upper opening. on the other hand,
The side plates 15 and 16 are located at the center plates 16 and 1 respectively.
7, the dense gas flow paths 35a and 35b are formed, and the opening at the upper end functions as auxiliary flame holes 29a and 29b.

The side plate members 15 and 18 and the center plate members 16 and 17 are joined by a caulking structure, which will be described later, and fitted together. Protrusion 5 by swaging
2 protrudes toward the center between the plate members 16 and 17.

The manufacturing process of the combustion apparatus 1 is as shown in FIG. 1. Four independent plate members 15 to 18 are press-formed (a), and then the outer plate member adjacent to the central plate member 16 is formed. 1
5 are joined by caulking to form the auxiliary component 53. Here, it is desirable to select a part near the flame hole as a part where both are fitted. Similarly, the center plate 17 and the adjacent outer plate 18 are caulked and joined to form the auxiliary component 54. And finally, the auxiliary component 5
The combustion apparatus is completed by attaching the flame holes (not shown).

Although the above-described example is an example in which the plates 15 to 18 are press-formed in an independent state, they may be pressed into a single plate. FIG. 2 shows a plate 15 to 1 on a single plate.
This is an example of molding No. 8. In FIG. 2, first, the developed shapes of the plate bodies 15 to 18 are press-formed on one plate. In the present embodiment, as shown in FIG. 2A, plate members 16 and 17 forming the main structure 20 are formed at both ends of one plate, and sub-structures 53 and 54 are formed at the center. Plates 15 and 18 to be formed are formed.

In this embodiment, the plates 16 and 17 formed on the outside as shown in FIG. 2B are folded inward. Then, the plate 16 and the plate 15 are joined by caulking, and similarly, the center plate 17 and the adjacent outer plate 18 are also caulked and joined. Finally, the plates 15 and 18 are bent and the four members are crimped together. Also in the present embodiment, the projection 52 formed by swaging is made to protrude between the central plate members 16 and 17.

[0024]

EXAMPLES Hereinafter, specific examples of the present invention will be described. In the following description, the term “up and down” refers to a state in which the combustion device 1 is installed with the flame hole facing upward.

FIG. 3 is a perspective view of a combustion apparatus according to a specific embodiment of the present invention. FIG. 4 is an exploded perspective view of the combustion device of FIG. FIG. 5 is a plan view, an enlarged view, and an enlarged cross-sectional view of the combustion device of FIG. 1 in a state where a flame hole member is removed. FIG. 6 is an explanatory diagram showing a caulking structure of a plate body. FIG. 7 is a development view of the combustion device of FIG. FIG.
It is explanatory drawing which shows the folding structure of the plate of FIG. FIG.
FIG. 4 is an explanatory diagram showing a flow of a fuel gas on a lean gas flow path side in the combustion device of FIG. 3. FIG. 10 is an explanatory diagram showing the flow of fuel gas on the rich gas flow path side in the combustion device of FIG. FIG. 11 is a sectional view taken along line AA of FIG. FIG.
It is BB sectional drawing and CC sectional drawing of FIG. FIG.
FIG. 4 is a perspective view taken in the direction of arrow D in FIG. 3. FIG. 14 is a view in the direction of arrow D in FIG. FIG. 15 is an explanatory diagram showing the flow of the fuel gas around the mixing section of the combustion device of FIG.

The combustion device 1 according to the present embodiment is used in parallel with a case or used alone, similarly to the combustion device 105 of the prior art. The combustion device 1 according to the present embodiment includes a burner main body 10 and a flame hole member 13. The burner main body 10 is composed of a central main structure 20 and auxiliary structures on both sides thereof. As shown in FIGS. 3, 4, 7, and 13, four metal plates 15, 16, 17, and 18 are stacked. It was made. These metal plates 15, 1
Each of 6, 17, and 18 is provided with an uneven shape by press working, and a flow path of air or fuel gas is formed between the plates. The metal plates 15, 16, 17, and 18 may be formed one by one and stacked. However, in this embodiment, a configuration in which one plate is folded is adopted.

That is, in the present embodiment, as shown in FIG. 7, one plate is divided into four sections and formed into shapes of A, B, C and D. Of the members A, B, C, and D, members A and D at both ends and members B and C adjacent to each other
Between them, there is an opening 41 constituting an auxiliary flame hole, so that both are joined by connecting portions 39 at both ends. Then, as shown in FIG. 8, these portions A and D at both ends are connected to the intermediate portions B and
Fold in between C and further fold B and C in the middle,
As a result, a configuration in which the metal plates 15, 16, 17, 18 are stacked is formed. The work procedure is as follows: first, the parts A and D at both ends are bent and overlapped between the intermediate parts B and C, and in this state, the parts A and B are circularly shaped by a caulking method called toglock caulking, which will be described later. The portion of the concave portion 18g and the portion of the mixing portion 23 are caulked. The fitting portions 60 and 61 (FIG. 1) formed by this caulking protrude inward as described later.

Similarly, the parts D and C are fitted and joined by caulking. Finally, the middle portions B and C are folded, and the periphery is crimped.

Hereinafter, the structure will be described with reference to the superposed state. In the combustion device 1 of the present embodiment, the two central plates 16 and 17 are symmetrical (palm) to each other, and the two are overlapped to form the main component 20. That is, the shape of the main structural body 20 is the plate body 16 serving as a front plate as shown in FIG.
And a plate 17 serving as a symmetrical (palm) -shaped back plate is superimposed on this. The main component 20 has a flat appearance, and the top 21 is open. Except for the top 21, flanges 20a are provided on three sides. However, the flange portion 20a is cut out on the upper side on the air inlet 27 side.

The shape of the notch portion 20c of the flange portion 20a is as shown in FIGS.
7, and is cut upward along the inclination of the venturi part 22. The upper side of the cutout portion 20c extends horizontally, and further has a U-shaped cutout 37 formed in a part thereof. The periphery of the notch 20c is an intermediate wall 38.

The two plates 16, which constitute the main component 20,
Inside the 17, a series of gas flow paths are formed by the two plate bodies 16 and 17. That is, the plate bodies 16 and 1
In a portion where 7 coincides, the metal plates are arranged so as to form a gap, and the gap forms the gas flow path 28. In the combustion device 1 of the present embodiment, the plate 1
Gas flow path 2 of main structure 20 constituted by 6 and 17
8 passes low concentration fuel gas. That is, the gas passage 28 formed in the main structure 20 functions as a lean gas passage.

In the main structure 20 employed in this embodiment, the fresh gas flow path 28 is roughly divided into a venturi section 22, a mixing section 23, a conduction section 24, and a flame hole member arrangement section 25. That is, the fresh gas flow path 28 starts from the air introduction port 27, and sequentially continues to the venturi section 22, the mixing section 23, the conduction section 24, and the flame hole member arrangement section 25. These shapes will be described below from the inlet of the fresh gas flow path 28.
That is, the lower corner of the main structure 20 is shown in FIGS.
, The air inlet 27 is open. Air inlet 2
7 is substantially elliptical. And the back side of the air inlet 27 is
A portion of the same cross-section as the end face of the air introduction port 27 is connected to the end face of the air introduction port 27 by a short length, and a taper 22a is provided at a position slightly entering from the air introduction port 27, and the width of the tapered shape is narrowed to form the venturi 22. . The venturi portion 22 is a portion where the flow path is narrowed inward and the cross-sectional area is sharply reduced.

However, the flow path in the venturi section 22 has a height that is gradually increased toward the downstream side, and the cross-sectional area is gradually increased toward the back.
The cross-sectional area of the fresh gas flow channel 28 of the venturi section 22 is constant at the point where the total height of the flow channel has reached a certain height. Further, in this embodiment, the parts constituting the venturi portion 22 of the plate bodies 16 and 17 are parallel to each other as shown in FIG.

The ventry portion 22 is a portion in which a part of the fresh gas flow passage 28 is deformed flat, and the surface thereof is flat and has a considerable area. Further, gas introduction openings 31 are provided in the portions of the plate bodies 16 and 17 that constitute the venturi portion 22, as shown in FIG. In the combustion device of the present embodiment, the venturi 22 is flat and has a considerable area as described above, so that a large number of gas introduction openings 31 can be provided. Specifically, in this embodiment, nineteen gas introduction openings 31 are provided in a staggered manner. It is desirable that the gas introduction openings 31 be widely distributed in a plane as in this embodiment, but they may be provided on a horizontal line or a vertical line. Although not recommended, the number of gas introduction openings 31 may be as small as one or two.

A tapered portion 22b is also provided on the downstream side of the venturi portion 22, and the width of the fresh gas flow path 28 is gradually increased by the tapered portion 22b. The mixing section 23 is formed by changing the direction of the fresh gas channel 28 greatly. The mixing section 23 is a portion where the air flow path is largely curved, and is a large curved path. The end of the mixing section 23 is located at the center of the main structure 20, and the portion beyond the end is narrowed again and is connected to the conducting section 24. Conducting part 24
Is about half the width of the mixing section 23 described above, and extends in a triangular shape including the end of the mixing section 23.

The conducting section 24 connects the end of the mixing section 23 and the flame hole member arrangement section 25, is continuous with the end of the mixing section 23, and is about 3 minutes from the air inlet 27 side of the main structure 20. Extends over one length of

The flame hole member arrangement portion 25 is located at the upper end of the main structure 20, and extends over the entire area in the longitudinal direction. Two rows of grooves 25a in the longitudinal direction are provided on the side surface of the flame hole member arrangement portion 25.
Is provided. The groove 25 a is recessed toward the inside of the flame hole member disposing portion 25, and extends over the entire area of the flame hole member disposing portion 25 in the longitudinal direction. This groove 25a
It is provided for the purpose of increasing the rigidity of the flame hole member arrangement portion 25 and for promoting the stirring of the fuel gas and the air.

On the other hand, the plates 15 and 18 which are arranged on the side surface of the main structure 20 and constitute the sub-structure are substantially rectangular in overall shape. Pressed to provide irregularities. The plate members 15 and 18 are symmetrical (palm) shapes with respect to each other, all have a concave shape, and have flange portions 15a and 1 at both ends and a lower portion in the longitudinal direction.
8a are provided. However, for the portion where the air inlet 27 is located, the flange 15
a and 18a are missing.

On the other hand, the portion corresponding to the mixing portion 23 of the main component 20 of the plates 15 and 18 disposed on the side surfaces is recessed inward as compared with the other portions. The shape of the concave portion 18b substantially matches the outer shape of the mixing portion 23. And the recess 1
The upper part of 8b is again extended outward. That is, the upper end 18c of the concave portion 18b is parallel to the upper and lower sides of the plate members 15 and 18, and has a length approximately one third of the total length of the plate members 15 and 18 from the back side to the air inlet 27. Occupy. The portion above the upper end 18c of the concave portion 18b is a bulging portion 18d for forming a dense gas flow path. The side of the dense gas flow path forming bulging portion 18d on the air inlet 27 side is an inclined side 18e. Then, the above-described concentrated gas channel forming bulging portion 18d
And a portion near the air introduction port 27 is communicated by the groove 40.

A groove-like concave portion 18 is provided on the upper part of the plate bodies 15 and 18.
f and a circular recess 18g are provided. Groove-shaped recess 1
8f is divided into six portions, and extends in a line over the entire region in the longitudinal direction of the plate bodies 15, 18. On the other hand, the circular recess 18
g is provided above the cut of the groove-shaped recess 18f. The recesses 18f and 18g are both the burner body 1.
It is concave toward the inside of 0. These recesses 1
8f promotes stirring of the fuel gas and the air. However, the circular recess 18g is provided in the burner body 1
Also acts as a caulking part when combining 0.

Next, the flame hole member 13 will be described. The flame hole member 13 employed in this embodiment is formed by stacking strip-shaped plates having irregularities, and has a quadrangular prism shape as a whole. The flame hole member 13 communicates with the upper and lower sides of the drawing by the gap between the irregularities. The opening at the upper end of the flame hole member 13 is
Functions as main flame hole. The flame hole member 13 includes a main component 20.
Is inserted into the flame hole member disposing portion 25 of FIG.

Next, the relationship between the respective members of the combustion apparatus 1 of this embodiment will be described. In the combustion device 1 of the present embodiment,
Sub-structures are formed by disposing plate bodies 15 and 18 on the left and right sides of a main structure 20 formed by the plates 16 and 17. The main component 20 and the plates 15, 1
8 is joined by overlapping the surrounding flange portions 20a, 15a, 18a. A fitting structure by caulking is employed for these joints. That is, the plate bodies are overlapped and hit with a punch-like tool to form a fitting structure as shown in FIG. The fitting by caulking is performed between the center plates 16 and 17 forming the main component 20 and the side plates 15 and 18 forming the sub component. That is, one plate body 16 in the center and the plate body 1 on the side surface portion adjacent thereto.
5 are fitted together by caulking, and the other plate 17 at the center and the plate 18 at the side adjacent to this
Fitting and joining by caulking is also performed between the two.

The central plate body 16, which constitutes the main structure 20,
17 and the side plates 15 and 18 constituting the sub-structure are fitted and joined together with the plates 15 and 18 described above.
Is performed in a circular recess 18g provided on the upper part.
The circular recess 18g is a portion near the main flame hole and the auxiliary flame hole. The reason why the central plate members 16 and 17 and the side plate members 15 and 18 constituting the sub-constituent body are joined at a portion near the main flame hole and the auxiliary flame hole as described above is that the portion is at a high temperature. This is because they are easily exposed to and are easily deformed. Therefore, it is desirable to perform the joining by caulking at a portion as close to the flame hole as possible, and it is recommended that the joint be a portion corresponding to the side surface of the flame hole member. In the present embodiment, the circular recess 18 is used.
Since the fitting joint by caulking is performed at the portion g, the inside of the fitting portion 60 by caulking is mainly located inside the circular recess 18g (the tip of the projection when viewed from the inside) as shown in FIGS. 5B and 5C. A gap is secured between the side surface of the main body 20 and a portion other than the concave portion 18g of the plate bodies 15 and 18 in contact with the side surface of the structure 20. The protrusion 63 at the tip of the fitting portion 60 by caulking protrudes inward as shown in FIG. 5C, and protrudes toward the flame hole member side (leaf gas flow path side).

Further, fitting and joining by caulking are shown in FIGS.
As shown in FIG. 1, the concave portions 18b of the plate members 16 and 17 and the plate member 1
The process is also performed between the mixing units 23 and 6. Also, with regard to the fitting portion 60 formed by the caulking, the protrusion 65 at the tip of the fitting portion 60 protrudes inward as shown in FIG.

Looking at the joining relationship between the main structure 20 and the plates 15 and 18, the main structure 20 and the plates 15 and 18 on the side surfaces are close to the air inlet 27 at the lower end. , Near the mixing section 23 and at the intermediate wall section 38, and the other parts are separated. That is, in the vicinity of the air inlet 27 at the lower end, the side surfaces 27a and 27b and the bottom surfaces 27c and 27d of the air inlet 27 of the main structure 20 are the side plates 15 and 18 as shown in FIGS. And there is no gap at the site.
However, the openings 46 of the plates 15, 18 which are sub-structures are larger than the air inlet 27, and the upper part of the air inlet 27 is not in contact with the openings 46 of the plates 15, 18. Therefore, the lower end of the burner main body 10 has a double-structured opening as shown in FIGS. 3, 13, and 15, and the air inlet of the main component 20 is located above the air inlet 27 of the main component 20. There is an opening formed inside the upper outer wall of the opening 27 and the openings 46 of the plates 15 and 18 serving as sub-structures. The opening functions as a concentrated gas inlet 43. In the present embodiment, the opening has a double structure, and the upper part of the air inlet 27 directly functions as a part of the wall of the dense gas inlet 43. Overall height can be reduced.

In this embodiment, since the dense gas inlet 43 is located above the air inlet 27, the dense gas inlet 43 is located near the main flame hole and the auxiliary flame hole, and the air gas inlet 27 is It is located far from the flares and auxiliary flares.

A space 33 is formed between the periphery of the venturi portion 22 of the main component 20 and the sub component.
The periphery of the ventri part 22 is separated from the sub-structure in three directions except for the bottom part.
It is surrounded by the void 33.

Further, a gap 45 is formed as shown in FIG. 12 so as to be separated from the main component 20 and the bulging portion 18d for forming the dense gas flow channel of the sub component. However, since the width of the conductive portion 24 of the main structure 20 is smaller than that of the other portions, the side surface of the conductive portion 24 has a space larger than other portions. The air gaps 45 are located on both side surfaces of the fresh gas flow passage 28 and extend over the entire length of the main structure 20.

The gap 33 formed on the lower side surface of the main structure 20 and the gap 45 formed on the upper portion are:
As shown in FIG. 12B and FIG. 15, the intermediate wall 3 of the main structure 20 is formed.
8 and the inner surface of the sub-structure are in contact with each other and there is no gap.
3, 45 are shielded. However, as shown in FIG. 12A, the upper and lower gaps 33 and 45 are communicated only by the groove 40 of the sub-structure. That is, a groove 40 is formed in a portion near the dense gas flow path forming bulging portion 18 d of the sub-structure and the air inlet 27, and the groove 40 forms the flow path forming bulging portion 18 d and the air introducing port 27. Are in communication.
On the other hand, since the intermediate wall portion 38 is a flat plate, the stenosis passage 47 is provided between both sides of the intermediate wall portion 38 and the groove 40 of each of the plates 15 and 18.
Is formed. Here, the details of the stenosis passage 47 will be described. The stenosis passage 47 is located in the notch 37 of the intermediate wall portion 38 as shown in FIG. In addition, the boundary between the bulging portions of the plates 15 and 18 near the opening of the sub-structure is shown in FIG.
However, there is no shape corresponding to the notch 37. Therefore, as shown in FIG. 15, the stenosis passage 47 that communicates the space between the upper space 45 and the lower space 33 is integrated at a portion corresponding to the cutout portion 37 of the intermediate wall portion 38, and is formed at an intermediate portion of the stenosis passage 47. It is divided right and left by the intermediate wall part 38

Therefore, a series of gas flow paths 35a, 35b connecting the lower gap 33 and the upper gap 45 via the narrow passage 47 are formed between the main structure 20 and the plates 15, 18. ing. The gas flow paths 35a and 35b are both open to the top surface. In the combustion device 1 of the present embodiment, the open surface functions as the auxiliary flame holes 29a and 29b. In the combustion device 1 of the present embodiment, the main flame holes are linear, and the auxiliary flame holes 29a,
29 b are located on both sides of the main flame hole 36 along the main flame hole 36. The gas flow paths 35a and 35b are provided with the auxiliary flame holes 29.
It functions as a rich gas flow path for supplying a rich mixed gas to the a and 29b.

More specifically, there is a gap between the plate body 16 constituting the main structure 20 and the plate body 15 adjacent thereto, and this gap is formed through a stenosis passage 47 from the vicinity of the lower end to the upper part of both. Communicating. The gap functions as the dense gas flow path 35a as described above. on the other hand,
There is also a gap between the plate 17 constituting the main structure 20 and the plate 18 adjacent thereto, and this gap communicates from the vicinity of the lower ends of both of them to the upper part, and functions as a dense gas flow path 35b. Then, the respective concentrated gas flow paths 35a, 35
b has an open upper part and auxiliary flame holes 29a and 29b are formed.

The shape of the side surface of the burner main body 10, more specifically, the shape of the side surface on the side of the air inlet 27 is as described above.
18 are in contact with each other. However, air inlet 2
At the upper part of 7, a part of the plate bodies 16 and 17 is missing, the rich mixed gas introduction port 43 is opened, and the above-mentioned rich gas flow paths 35a and 35b communicate with the outside. Further, a cutout portion 20c is provided in the main structure 20 of the relevant portion. Therefore, a relatively wide gap 30 is provided above the air inlet 27 and is open to the outside.

The venturi section 22 of the main structure 20
Is narrower than the other parts.
As shown in FIGS. 13 and 14, there is a relatively large gap 33 between the plate 2 and the plates 15 and 18 on both sides. The gap 33 functions as a branch for the fuel gas. In addition, the aforementioned gap 3
The gap 33 on the side of the zero and the venturi part 22 also functions as a mixing part 48 of the fuel gas and the air.

The main structure 20 functions as a lean gas flow path, and the gap 33 is a part of the rich gas flow paths 35a and 35b. It is surrounded by a mixing section 48 which is a part of 35a and 35b.

The ignition device 3 is provided as an accessory of the combustion device 1.
4 are provided. The ignition device 34 is provided with the auxiliary flame hole 29.
a, 29b and near the upper part of the air inlet 27.

Next, the flow of fuel gas and air in the combustion device 1 of this embodiment will be described. Combustion device 1 of the present embodiment
Then, the fuel gas nozzle 11 is inserted into the dense gas inlet 43 above the air inlet 27 of the burner body 10 described above. A blower (not shown) is provided on the upstream side of the burner main body 10, and air is supplied to both the concentrated gas inlet 43 and the air inlet 27. That is, the insertion state of the fuel gas nozzle 11 is the same as that of a normal Bunsen-type combustion burner, and there is a gap or an opening between the rich gas inlet 43 and the gas nozzle 11. At the same time, air is mixed. The mixing ratio of air to fuel gas is about 40% of the theoretical air amount, and the fuel gas concentration is high. On the other hand, from the air inlet 27,
Only air is introduced.

The fuel gas entering from the above-described concentrated gas inlet 43 is mixed with air in the mixing section 48.
Here, the mixing section 48 is a combination of the gap sections 30 and 33 and is a gap section having a certain size, so that the fuel gas and the air are smoothly mixed to produce a rich mixed gas.
A part of the rich mixed gas enters the upper space 45 through the narrow passage 47 as shown in FIGS. And FIG.
The auxiliary flame holes 29a and 29b in the upper part spread over the whole area as shown in FIG.
From the outside. That is, a part of the fuel gas flows upward along the side surfaces of the main component 20 in the dense gas flow paths 35a and 35b as shown in FIG. 12, and the auxiliary flame holes 29a and 29b provided on both sides of the main component 20. From the outside. Auxiliary flame holes 29a, 2 via dense gas passages 35a, 35b
As described above, the mixed gas injected from 9b contains only about 40% of the theoretical amount of air, and has a high fuel gas concentration.

In the combustion apparatus 1 of this embodiment, the fuel gas and the air flow through the narrow flow path (narrow passage 47) immediately before entering the gap 45 on the upper side of the rich mixed gas flow paths 35a and 35b. Mixing is further promoted. In this embodiment,
The stenosis passage 47 is common to the left and right at the entrance,
The passage is divided into right and left by an intermediate wall portion 38 at an intermediate portion. Therefore, the opening cross-sectional area of the left and right passages is determined only by the cross-sectional area of the middle portion of the narrowed passage 47. Here, the constriction passage 47 is the groove 40 formed by pressing the plate body, and the inside thereof and the middle portion have the highest molding accuracy. For this reason, in the combustion device 1 of the present embodiment, the rich mixed gas mixed in the mixing section 48 is evenly distributed between the left and right rich gas passages 35a and 35b.
Divided into a good balance of left and right supplementary flame.

On the other hand, the remainder of the fuel gas entering from the mixing section 48 (the gaps 30 and 33) reaches the vicinity of the ventry section 22 as shown in FIG. It flows into the gap 33 (branch) surrounding the 22.
The remainder of the fuel gas enters the main structure 20 through the gas introduction opening 31 provided in the venturi unit 22. That is, the fuel gas enters the fresh gas passage 28 via the gas introduction opening 31. Here, in the present embodiment, the gas introduction opening 31 is provided at a portion where the main structural body 20 has a partially reduced cross-sectional area. Therefore, the flow velocity is high in the part, and the inside has a negative pressure tendency. On the other hand, the periphery of the venturi part 22 is surrounded by a part of the concentrated gas flow paths 35a and 35b, and around the venturi part 22, the rich mixed gas is sufficiently present. Therefore, the rich mixed gas around the venturi section 22 is sucked by the negative pressure of the main component 20, and the fuel gas enters in a direction perpendicular to the flow of the air and flows through the main component (the light gas passage 28). It is mixed with the flowing air.

The mixing of the fuel gas is further promoted in the mixing section 23. In particular, in the combustion device 1 of the present embodiment, FIG.
Since the protrusion 65 of the fitting portion 61 formed by caulking protrudes inside the mixing portion 23 as in 1, the airflow collides with the protrusion 61 and the mixing is promoted. Then, the light mixed gas reaches the flame hole member arrangement portion 25 via the conduction portion 24. Further, in the combustion device 1 of the present embodiment, the flame hole member
Since the protrusion 63 of the fitting portion 60 by crimping protrudes as shown in c, the air current collides with the protrusion 63 and the mixing is promoted. Then, the light mixed gas enters the flame hole member 13 and is injected outside from the main flame hole 36.

In the combustion device 1 of this embodiment, the fuel gas is
Following the above-described paths, the main flame hole 3 of the flame hole member 13
6 emits a light mixed gas, and the auxiliary flame holes 29a and 29b located on the side surfaces inject a rich mixed gas. However, focusing on the distance to the two flame holes, there is a considerable difference between the two. That is, the flow path of both fuel gases is common up to the above-described space 33 (branch portion). However, the concentrated gas inlet 43 is located closer to the main flame hole and the auxiliary flame hole than the air inlet 27, and
The dense gas flow paths 35a and 35b reaching 9a and 29b extend directly upward from the vicinity of the gap 33 (branch).
Therefore, the rich mixed gas rises directly upward from the vicinity of the gap 33 (branch) and is injected from the auxiliary flame holes 29a and 29b.

On the other hand, the light mixed gas injected from the main flame hole 36 once flows from the gap portion 30 to the lower space 33 (branch portion) and enters the light gas flow passage 28 in the main structure 20. After passing through the mixing section 23, which is a large curved portion, the deflector largely detours and reaches the main flame hole 36. Therefore, when an electromagnetic valve (not shown) is opened and fuel gas is introduced from the fuel gas nozzle 11, there is a time difference between the fuel gas injection from the two flame holes, and the fuel gas is first injected from the auxiliary flame holes 29a and 29b, Supplementation occurs. The fuel gas injected from the auxiliary flame holes 29a and 29b has a high concentration and immediately ignites the fuel gas. In particular, the auxiliary flame holes 29a, 29b
Immediately after the fuel gas has been injected from the fuel gas, the low-concentration fuel gas has not been injected from the main flame hole 36 yet, so that it is not fueled by the low-concentration fuel gas. Therefore, ignition of the fuel gas injected from the auxiliary flame hole is reliable.

Subsequently, the gap 3 from the gap 30 to the lower gap 3
The fuel gas of a low concentration is injected from the main flame hole 36 by delaying the injection of the fuel gas from the auxiliary flame holes 29a and 29b via the mixing portion 23 which is a detour to the third flame portion (branch portion). However, when the low-concentration fuel gas is injected, the supplementary flame has already been burned in a stable state, the fire shifts from the supplementary flame, and the low-concentration fuel gas ignites immediately, generating a main flame. In addition, since there is a stable supplementary flame at the root of the main flame, the supplementary flame holds the base end of the main flame, and the occurrence of a fire blow is small immediately after the ignition of the main flame. Therefore, in the combustion apparatus of the present embodiment, unburned components are not discharged to the outside, and discomfort or anxiety due to gas odor is not caused.

Although the combustion apparatus of the present invention has been completed in the course of developing a lean-burn combustion apparatus, the present invention can be applied to combustion apparatuses other than the lean-burn combustion apparatus.

[0065]

As described above, since the combustion device according to the first aspect is manufactured by folding one plate, positioning is easy. Therefore, the present invention has an effect that manufacturing is easy.

In the combustion apparatus according to the second aspect and the method for manufacturing the combustion apparatus according to the sixth aspect, since the plates are joined by the fitting structure, the welding step is not interposed during the assembly step. This has the effect of simplifying the configuration of the manufacturing line.

Further, in the combustion device according to the third aspect, in the combustion device of the present invention, since the fitting portion protrudes toward the two walls in the center, the agitation of the fuel gas and the air is promoted, This has the effect of stabilizing the flame.

The combustion device according to the fourth aspect has the effect of reinforcing the vicinity of the flame hole exposed to high temperature, and can prevent a change in the combustion state due to deformation.

In the combustion apparatus according to the fifth aspect, the gap between the walls is reliably secured by the projection, the dense gas flow path is not blocked, and the supplementary flame is not interrupted.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a combustion device and a manufacturing process thereof according to an embodiment of the present invention.

FIG. 2 is an explanatory view showing a combustion apparatus according to another embodiment of the present invention and a manufacturing process thereof.

FIG. 3 is a perspective view of a combustion device according to a specific embodiment of the present invention.

FIG. 4 is an exploded perspective view of the combustion device of FIG.

FIG. 5 is a plan view, an enlarged view, and an enlarged sectional view of the combustion device of FIG. 1 in a state where a flame hole member is removed.

FIG. 6 is an explanatory view showing a caulking structure of a plate body.

FIG. 7 is a development view of the combustion device of FIG. 3;

FIG. 8 is an explanatory view showing a folded structure of the plate body of FIG. 7;

FIG. 9 is an explanatory diagram showing a flow of a fuel gas on a lean gas flow path side in the combustion device of FIG. 3;

FIG. 10 is an explanatory diagram showing a flow of a fuel gas on a rich gas flow path side in the combustion device of FIG. 3;

FIG. 11 is a sectional view taken along the line AA of FIG. 3;

FIG. 12 is a cross-sectional view taken along line BB and a line CC of FIG. 3;

FIG. 13 is a perspective view as viewed in the direction of arrow D in FIG. 3;

FIG. 14 is a view in the direction of arrow D in FIG. 3;

FIG. 15 is an explanatory diagram showing a flow of fuel gas around a mixing section of the combustion device of FIG. 3;

FIG. 16 is an explanatory view showing a conventional combustion device and its manufacturing process.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Combustion apparatus 10 Burner main body 11 Fuel gas nozzle 13 Flame hole member 15, 16, 17, 18 Plate body 20 Main structure 22 Ventery part 23 Mixing part 25 Flame hole member arrangement part 27 Air inlet 28 Light gas flow path 29a, 29b Auxiliary flame hole 31 Gas introduction opening 35a, 35b Gas flow path (rich gas flow path) 36 Main flame hole 43 Rich gas introduction port 52 Projection 60, 61 Fitting portion by caulking 63, 65 Projection

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Yasuhiko Sato 93rd Edocho, Chuo-ku, Kobe City, Hyogo Pref. (72) Inventor: Hidenori Hata 93, Edo-cho, Chuo-ku, Kobe, Hyogo Prefecture Inside Noritz Co., Ltd. Shingo Kimura 93 Edocho, Chuo-ku, Kobe City, Hyogo Prefecture Inside Noritz Co., Ltd. (72) Inventor Masahiro Iguchi 93 Edocho, Chuo-ku, Kobe City, Hyogo Prefecture Inside Noritz Co., Ltd. 93, Edo-cho, Chuo-ku, Yokohama-shi (72) Inventor Shunichi Miki 93, Edo-cho, Chuo-ku, Kobe, Hyogo Pref. The internal F-term (reference) 3K017 AA01 AB02 AD01 AD03 AD11 3K065 TA04 TA14 TA15 TD05 TH04 TP08

Claims (6)

[Claims] 1. A main flame hole for linearly extending and injecting a low-concentration fuel gas, and a fuel gas adjacent to both side surfaces of the main flame hole and having a higher concentration than the fuel gas injected from the main flame hole. In a combustion device having an auxiliary flame hole to be formed, a single plate formed into a predetermined shape is constituted by four walls which are folded in four in parallel, and a space between two central walls is formed. A lean gas flow path for supplying fuel gas to the main flame hole is formed, and a rich gas flow path for supplying fuel gas to the auxiliary flame hole between the two central walls and the outer wall adjacent thereto. A combustion device characterized by comprising: 2. A main flame hole for injecting a fuel gas having a low concentration in a straight line, and a fuel gas having a higher concentration than fuel gas which is adjacent to both side surfaces of the main flame hole and is injected from the main flame hole. In a combustion device having an auxiliary flame hole, a light gas flow path for supplying fuel gas to the main flame hole is formed between the two wall portions at the center, A dense gas flow path for supplying fuel gas to the auxiliary flame hole is formed between the two wall portions and the outer wall portion adjacent thereto, and furthermore, the two central wall portions and the adjacent outer wall portions are formed. A combustion device characterized by being fitted and connected to each other at a fitting portion. 3. The combustion device according to claim 1, wherein the fitting portion protrudes toward two central wall portions. 4. The combustion device according to claim 1, wherein the fitting portion is provided near the flame hole. 5. A projection is provided on the outside of the central two walls or on the inside of the outer wall adjacent thereto, and the projection comes into contact with the other wall to secure a gap between the walls. A combustion device characterized in that: 6. A step of forming the four walls by pressing, a step of caulking a plate disposed at the center and a plate disposed outside adjacent thereto and fittingly joining them. The method for manufacturing a combustion device according to any one of claims 1 to 5, further comprising a step of overlapping and joining the four walls in the fitted state.