JP3709281B2 - Surface combustion burner device - Google Patents

Description

【００１１】
表１に示すように、ガス室Ａ内の圧力損失が１０ｍｍＡｑを越えると笛吹き音が発生しなくなることがわかる。ここで、マットの圧力損失は問題とならない。
【００１２】
尚、上記構成では仕切板５として、マット１と同様な金属細線を絡ませて焼成してなるマットを用いたが、金属製メッシュを積層してなるものでも同様な効果が得られる。
【００１３】
また、上記構成では、仕切板５をマット１と共締めしたが、これに限定されず、整流板７の支持部材８を利用して取り付けても良い。ここで、仕切板５による混合ガスの分散の程度によっては整流板７を省略することもできる。
【００１４】
【発明の効果】
上記した説明により明らかなように、本発明による表面燃焼バーナ装置によれば、金属細線からなる多数の繊維を絡ませて形成されると共に多数の小孔が穿設された燃焼用マットの裏面側空室（ガス室）に於ける混合ガスの圧力損失が、ガス流量を３．５Ｌ／ｍｉｎ／ｃｍ²としたときに１０ｍｍＡｑを越えるように、このマットのガス上流側に通気性の仕切板を設けることで、不快な笛吹き音の発生を容易に、かつ確実に防止でき、表面燃焼バーナ装置の静粛性が向上する。これにより、高負荷燃焼も低騒音で可能となる。
【図面の簡単な説明】
【図１】本発明が適用された好適な実施形態を示す表面燃焼バーナ装置の要部断面図。
【符号の説明】
１ マット
１ａ 小孔
２ ケーシング
２ａ 外向フランジ
３ 混合ガス供給管
４ パッキン
５ 仕切板
６ パッキン
７ 整流板
８ 支持部材
Ａ ガス室（空室）[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a surface combustion burner device used for a domestic water heater, a gas stove, and the like, and more particularly to a surface combustion burner device using a combustion mat formed by entanglement of a large number of fibers made of fine metal wires.
[0002]
[Prior art]
Conventionally, as a burner mat used in a surface combustion burner apparatus such as a domestic water heater or a gas stove, a ceramic plate having a large number of holes is generally used. For example, Japanese Patent Application No. 60-40961 is disclosed. The specification describes a surface combustion burner device using a combustion mat formed by entwining a large number of fibers made of fine metal wires. In addition, attempts have been made to open a large number of small holes in the mat in order to prevent a large amount of gas from flowing for high-load combustion and to prevent the mat from being clogged with dust.
[0003]
[Problems to be solved by the invention]
However, if a large number of holes are provided in the combustion mat, depending on the diameter and gas pressure, a sound that causes the combustion sound to resonate during combustion and blow a whistle (hereinafter referred to as a whistling sound) is generated. In some cases, however, the quietness of the combustion apparatus may be hindered. Incidentally, the resonance frequency of the whistling sound is about 700 Hz to 1200 Hz.
[0004]
The present invention has been made in view of the above-described problems of the prior art, and its main purpose is for combustion in which a large number of fibers made of fine metal wires are entangled and a large number of small holes are perforated. The object is to prevent whistling noise of a surface combustion burner device using a mat with a simple structure.
[0005]
[Means for Solving the Problems]
According to the present invention, the above-described object is achieved by fixing a combustion mat formed by entwining a large number of fibers made of fine metal wires and having a large number of small holes to a casing, A surface combustion burner apparatus in which a mixed gas of combustion gas and air is supplied to the side and combusted on the surface, wherein the pressure loss of the mixed gas in the back side empty space of the mat is a gas flow rate. This is achieved by providing a surface combustion burner device characterized in that a gas-permeable partition plate is provided on the gas upstream side of the mat so as to exceed 10 mmAq when the pressure is 3.5 L / min / cm ^2. The In particular, the partition plate may be a laminate of metal meshes or one formed by entanglement of a large number of fibers made of fine metal wires.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
[0007]
FIG. 1 is a cross-sectional view of an essential part of a surface combustion burner device showing a preferred embodiment to which the present invention is applied. This surface combustion burner device has a mat 1 formed by winding a large number of heat-resistant metal thin wires having a wire diameter of 20 μm to 100 μm and firing, and a casing 2 having a mixed gas supply pipe 3 connected to the rear end. ing. An outward flange 2 a is formed at the front end of the casing 2. A partition plate 5 which will be described later is arranged on the outward flange 2a via a packing 4, and the mat 1 and the partition plate 5 are fixed to the casing 2 by aligning the edges of the mat 1 and fastening them with bolts via the packing 6. are doing. A rectifying plate 7 is provided in a gas chamber (empty chamber) A defined between the casing 2 and the mat 1. The mat 1 is provided with a large number of small holes 1a having a diameter of about 1 mm so that the mixed gas can easily pass therethrough.
[0008]
The partition plate 5 provided on the gas upstream side of the mat 1 is for preventing the whistling sound from being generated, and is constituted by a mat that is fired with the same fine metal wires as the mat 1 entangled. However, no small holes are provided. The density and the like are set so that the pressure loss in the gas chamber A exceeds 10 mmAq when the gas flow rate is 3.5 L / min / cm ² .
[0009]
Table 1 shows whether or not the whistling sound is generated due to the pressure loss in the gas chamber A.
[0010]
[Table 1]

[0011]
As shown in Table 1, it can be seen that when the pressure loss in the gas chamber A exceeds 10 mmAq, no whistling sound is generated. Here, the pressure loss of the mat is not a problem.
[0012]
In the above configuration, the partition plate 5 is a mat formed by tangling and firing the same fine metal wires as the mat 1, but the same effect can be obtained by stacking metal meshes.
[0013]
Moreover, in the said structure, although the partition plate 5 was fastened together with the mat 1, it is not limited to this, You may attach using the supporting member 8 of the baffle plate 7. FIG. Here, the rectifying plate 7 may be omitted depending on the degree of dispersion of the mixed gas by the partition plate 5.
[0014]
【The invention's effect】
As is apparent from the above description, according to the surface combustion burner device according to the present invention, the space on the back side of the combustion mat formed by entwining a large number of fibers made of fine metal wires and having a large number of small holes formed therein. A gas-permeable partition plate is provided on the gas upstream side of the mat so that the pressure loss of the mixed gas in the chamber (gas chamber) exceeds 10 mmAq when the gas flow rate is 3.5 L / min / cm ^2. As a result, unpleasant whistling noise can be easily and reliably prevented, and the quietness of the surface combustion burner device is improved. As a result, high load combustion is also possible with low noise.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an essential part of a surface combustion burner device showing a preferred embodiment to which the present invention is applied.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Mat 1a Small hole 2 Casing 2a Outward flange 3 Mixed gas supply pipe 4 Packing 5 Partition plate 6 Packing 7 Current plate 8 Support member A Gas chamber (vacant)

Claims (4)

A combustion mat, which is formed by entwining a large number of fibers made of fine metal wires and has a large number of small holes, is fixed to the casing, and a mixed gas of combustion gas and air is supplied from the backside space to the front side. A surface combustion burner device for burning it on the surface,
A breathable partition plate on the gas upstream side of the mat so that the pressure loss of the mixed gas in the back side empty space of the mat exceeds 10 mmAq when the gas flow rate is 3.5 L / min / cm ^2. The surface combustion burner apparatus characterized by providing. The surface combustion burner device according to claim 1, wherein the small hole of the mat has a diameter of about 1 mm. The surface combustion burner device according to claim 1 or 2, wherein the partition plate is formed by entwining a large number of fibers made of fine metal wires. The surface combustion burner device according to claim 1 or 2, wherein the partition plate is formed by laminating metal meshes.

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