JP2004308945A - Thick and thin fuel burner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make stable the combustion of pilot gas in a thick and thin fuel burner. <P>SOLUTION: In a burner port unit 9 storably fixed to the upper part of a thin fuel burner unit 2, a through-hole 32 communicating a second slit 30 forming a thin flame burner port 10 with a clearance part 33 is formed in a second partition plate 18 positioned on the outermost side. A communication hole 24 communicating a first slit 23 with the second slit 30 is formed in a first partition plate 17 on the inside thereof. By this, a part of thin gas jetted from the burner port unit 9 can be supplied to the clearance part 33. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention provides a light flame port to which a lean gas is supplied, and a rich flame port which is disposed on both sides of the light flame port and to which a rich gas is supplied, and is used for a gas burning appliance such as a water heater. Burner (low NOx burner).
[0002]
[Prior art]
In a gas-burning appliance such as a water heater, in order to reduce the emission of NOx (nitrogen oxide), a fuel-lean mixture (lean gas) leaner than the stoichiometric air-fuel ratio is burned at a central light flame port to make the main flame. And a rich burner (low NOx burner) that burns a mixture (rich gas) richer in fuel than the stoichiometric air-fuel ratio at the rich burner ports on both sides of the light burner port to form a sleeve fire may be used. . This light and light burner has a light gas inlet and a gas passage, for example, as shown in Patent Document 1, and a light burner that accommodates a flame port unit having a light flame port formed of a plurality of slits in an upper flame port portion. The unit and a pair of dense gas inlets and gas passages are fixedly assembled from the left and right to the upper part of the light burner unit, and a pair of dense gas inlets and gas passages are formed in the assembled state. Things are known.
[0003]
[Patent Document 1]
JP 2001-182910 A
[Problems to be solved by the invention]
In the above-mentioned light and shade burner, in order to suppress the interference between the main flame formed by the light flame port and the base of the sleeve flame formed by the rich flame port, and to stabilize the base of the main flame, A gap is provided at regular intervals between the mouth and the mouth to form a convection zone. However, the base portion on the light flame port side of the sleeve flame tends to become unstable due to the gap portion, and the sleeve flame may flutter, causing noise or vibration.
[0005]
Therefore, an object of the present invention is to provide a light-and-dark burner capable of effectively reducing noise and vibration by stabilizing combustion of a sleeve fire.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 is characterized in that a supply means for supplying a small amount of a part of the fresh gas supplied to the light flame port is provided at a base end inside the rich flame port. It is assumed that.
According to the second aspect of the present invention, in addition to the object of the first aspect, in the case where a gap is formed at a fixed interval between the light flame port and the rich flame port, the supply is performed using the gap section. In order to simply form the means, the supply means is configured to supply a small amount of a part of the fresh gas to the gap.
According to the third aspect of the present invention, in addition to the object of the second aspect, in order to more easily form the supply means, the supply means is provided on a partition plate formed between the light flame port and the gap. It is a hole.
The invention described in claim 4 has, in addition to the object of claim 2 or 3, a plurality of light flame ports formed between a plurality of partition plates in order to appropriately supply a fresh gas to the gap. In the case of a slit, the upstream side of the outermost slit adjacent to the gap is closed, and a communication hole for communicating the outermost slit and the inner slit is formed in the inner partition plate. Things.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an exploded perspective view showing an example of a light and light burner according to the present invention. A light and light burner 1 is provided with a light burner unit 2 having a light flame port for forming a main flame and a light flame port for forming a sleeve flame. And a dark burner unit 3. The light burner unit 2 is formed by spot welding and caulking two press-formed sheet metals 4 and 4 to each other in a manner to clamp and fix the flame port unit 9 on the upper part. Similarly, the dense burner unit 3 whose upper side is opened except for the connecting pieces 6 and 6 at the upper end is sandwiched from both sides by spot welding by press molding with the sheet metal 5, whereby the both are integrally assembled.
[0008]
In the light burner unit 2, an oval light gas inlet 7 is formed on the lower side edge and a flame port 8 is formed on the upper side edge by the combination of the left and right sheet metals 4 and 4, respectively. A flame port unit 9 is fixed therein, and open at the upper end of the flame port section 8 light flame ports 10, 10... Note that the deep flame outlet 11 of the rich burner unit 3 is an opening formed between the dark burner unit 2 and the light burner unit 2 by assembling the deep burner unit 3, and is located on the left and right sides of the light flame outlets 10, 10,. Each connecting piece 6 is similarly divided into six in the longitudinal direction in accordance with the position of the light flame port 10.
[0009]
A U-shaped gas passage 12 is formed between the lean gas inlet 7 and the flame opening 8 in the lean burner unit 2 in a horizontal direction, and the lower end is located at the lean gas inlet 7 and the upper end is located at the flame opening 8. The connecting portion between the gas passage 12 and the flame opening 8 is formed in a tapered pressure equalizing chamber 13 whose longitudinal dimension becomes longer as going upward. Thus, the air-fuel mixture is supplied to the entirety of the flame outlet 8. Similarly, in the rich burner unit 3, right and left of the light burner unit 2, the rich gas inlets 14, 14 located above the light gas inlet 7 and having a circular shape on the left and right, and the left and right rich gas inlets 14 and the rich flame outlet. Gas passages 15 and 15 are formed to connect the gas passages 11 and 11, respectively.
[0010]
FIG. 2 is an exploded perspective view of the flame port unit 9. The flame port unit 9 includes a core plate 16 located at the center, and a pair of first partition plates 17, 17 disposed on the left and right sides of the core plate 16. Further, the pair of second partition plates 18 and 18 disposed outside thereof are made of five sheet metals having the same height and the same length, and these plates are arranged in a state where the heights are aligned so that the upper edges thereof coincide. It is integrated by spot welding. First, the core plate 16 is a flat plate having no irregularities on its surface, and a band-shaped cutout 19 is formed below the bottom plate except for both front and rear ends.
[0011]
Next, the first partition plates 17, 17 have a band-shaped first bulging portion 20 bulging in a direction away from the core plate 16 at substantially the same height and length as the cutout portion 19 of the core plate 16, and a first bulging portion 20. The first bulging portion 20 is divided into six concave portions 22, 22... Abutting on the core plate 16, and the second bulging portion 21 having a smaller bulging amount than the first bulging portion 20 is formed into a core. The first slit 23 is formed between the first and second bulging portions 20 and 21 and the core plate 16 as shown in FIG. Is done. Further, a plurality of communication holes 24, 24,... Are formed in a row in the longitudinal direction at equal intervals above the first bulging portion 20, and the communication between the first bulging portion 20 and the second bulging portion 21 is established. The boundary portion is a first inclined surface 25 that becomes lower as going outward.
[0012]
Then, the second partition plates 18, 18 have the same length as the first bulging portion 20 except for the closing portion 26 in contact with the first bulging portion 20 of the first partition plate 17 over the entire lower edge. Is divided into six by a third bulging portion 27 formed to bulge into the first bulging portion 27 and five second concave portions 29, 29,... Abutting on the first partition plate 17 above the third bulging portion 27. A fourth bulging portion 28 whose bulging amount is smaller than the bulging portion 27 is press-formed so as to be symmetrical about the core plate 16, and the third and fourth bulging portions 27 and 28 are formed. A second slit 30 whose lower part is closed is formed between the second slit 30 and the first partition plate 17. In addition, the boundary between the third bulging portion 27 and the fourth bulging portion 28 becomes a second inclined surface 31 that becomes lower as going outward, and the fourth bulging portion 28 on the second sloping surface 31 Are formed in a line in the longitudinal direction at equal intervals. Here, the ratio of the total area of the communication holes 24, 24,... And the total area of the through holes 32, 32,.
[0013]
In the light and shade burner 1 configured as described above, when the flame port unit 9 is assembled, the sheet metal of the light burner unit 2 is provided on the outer surface of the third bulging portion 27 of the second partition plate 18 as shown in FIG. Since the portions 4 and 4 are in contact with each other, gaps 33 and 33 are formed on both sides of each of the light flame ports 10 formed by the first and second slits 23 and 30, and the rich flame ports 11 and 11 are located outside thereof. . Therefore, when the density burner 1 is mounted on a mounting frame (not shown) and gas is ejected from the nozzle table fixed to the mounting frame to the light gas inlet 7 and the rich gas inlet 14, the light gas and the combustion air are supplied to the respective gas inlets. The gas is supplied as a rich gas, passes through the gas passages 12 and 15, and is ejected from the light flame port 10 and the rich flame port 11, respectively. Here, when ignited by an unillustrated ignition means such as a discharge electrode, the light flame port 10 burns as the main flame a and the rich flame port 11 burns as the sleeve flame b.
[0014]
At the time of this combustion, the fresh gas passing through the flame port unit 9 is directly ejected upward through the first slits 23 on the left and right sides of the core plate 16, and a part of the fresh gas is, as shown by the arrow, Flow from the communication holes 24, 24,... Formed in the first bulging portion 20 to the outer second slit 30, and squirt upward through the space between the first and second inclined surfaces 25, 31. A part of the fresh gas also flows into the gaps 33, 33 from the through holes 32, 32,... Formed in the second inclined surface 31 as shown by arrows, and flows out upward. Since the fresh gas in 33 comes into contact with the base end of the main flame a and the sleeve flame b on the gap portion 33 side and burns, the base ends of the main flame a and the sleeve flame b are formed near the opening of the gap portion 33. . Therefore, particularly in the case of the sleeve fire b, the combustion speed at the base end on the side is increased, and the combustion is stabilized.
[0015]
As described above, according to the dense burner 1 of the above-described embodiment, the supply means for supplying a small amount of a part of the fresh gas supplied to the light flame port 10 is provided at the base end inside the rich flame port 11, so The combustion of b is stabilized, and noise and vibration are effectively reduced.
In addition, since the supply means is configured to supply a small amount of a part of the light gas to the gap 33 between the light flame port 10 and the rich flame port 11, the supply means is easily formed using the gap 33. It is possible.
Further, since the through holes 32 are employed as the supply means, the supply means can be formed more easily.
In particular, in the flame port unit 9 formed by a plurality of partition plates, the downstream side of the outermost second slit 30 communicating with the gap 33 is closed by the through hole 32, and the second slit 30 is positioned inside the second slit 30. Since the communication hole 24 of the first partition plate 17 communicates with the first slit 23, the flow rate of the lean gas gradually decreases toward the gap 33, and the supply of the lean gas to the gap 33 is performed. Adjustment of the amount becomes easy, and appropriate supply for stabilizing the sleeve flame can be performed within a range that does not affect the combustion of the main flame.
[0016]
In addition, the through-hole serving as a means for supplying the fresh gas to the gap may be an ellipse or a slit in the vertical or horizontal direction, and the number and shape may be changed as appropriate. It is good. This change is similarly possible in the communication hole.
On the other hand, the present invention can be adopted even if the burner is a light and shade burner which is not divided in the longitudinal direction, and is not necessarily limited to the structure using the partition plate in which the bulging portion is press-molded, and is flat without the bulging portion. The present invention can be applied to a case in which various partition plates are arranged at predetermined intervals. In this case, the through hole serving as the supply means may be provided in the outermost partition plate adjacent to the gap.
[0017]
【The invention's effect】
According to the first aspect of the present invention, the supply means for supplying a small amount of a part of the fresh gas supplied to the light flame port is provided at the base end inside the flame hole, so that the sleeve from the flame port is provided. Fire combustion is stabilized, and noise and vibration are effectively reduced.
According to the second aspect of the present invention, in addition to the effect of the first aspect, a gap is formed at a fixed interval between the light flame port and the rich flame port, and the supply means is provided with the gap section. By providing a configuration in which a small amount of the lean gas is supplied, the supply means can be easily formed using the gap.
According to the third aspect of the present invention, in addition to the effect of the second aspect, the supply means is a through hole formed in the partition plate between the light flame port and the gap, so that the supply means is provided. It can be formed more easily.
According to the invention described in claim 4, in addition to the effect of claim 2 or 3, the light flame port is formed of a plurality of slits formed between the plurality of partition plates, and is adjacent to the gap. By closing the upstream side of the outermost slit and forming a communication hole that connects the outermost slit and the inner slit to the inner partition plate, the supply of the fresh gas to the gap is appropriately performed. It can be carried out.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of a shade burner.
FIG. 2 is an exploded perspective view of a flame port unit.
FIG. 3 is an enlarged cross-sectional view of an upper end portion of the density burner.
[Explanation of symbols]
1. Light and light burner, 2 and light burner unit, 3 and light burner unit, 7 and light gas inlet, 9 and flame outlet unit, 10 and light flame outlet, 11 and rich flame outlet and 12, 15 gas passage, 14 concentrated gas inlet, 16 core plate, 17 first partition plate, 18 second partition plate, 23 first slit, 24 communication hole, 30 A second slit, 32, a through hole, 33, a gap;

Claims (4)

A light flame port to which a light gas mixed with gas and combustion air is supplied, and a rich flame port which is arranged on both sides of the light flame port and to which a concentrated gas mixed with gas and combustion air is supplied. Light and shade burner with
A light-and-dark burner, characterized in that a supply means for supplying a small amount of a part of the fresh gas supplied to the lightly-heated hole is provided at a base end inside the densely-flamed hole. 2. The apparatus according to claim 1, wherein the supply unit is configured to supply a small amount of a part of the light gas to the gap portion, wherein the gap portion is formed at a fixed interval between the light flame port and the rich flame port. 3. Light and dark burner. The light and shade burner according to claim 2, wherein the supply means is a through hole formed in a partition plate between the light flame port and the gap. In the case where the light flame port is composed of a plurality of slits formed between the plurality of partition plates, the upstream side of the outermost slit adjacent to the gap is closed, and the outermost slit is closed by the innermost partition plate. The shade burner according to claim 2 or 3, wherein a communication hole for communicating the slit with the slit inside the slit is formed.

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