JP3580325B2 - Surface burner - Google Patents

Description

[0001]
[Industrial applications]
TECHNICAL FIELD The present invention relates to a surface combustion burner used for an upper fire burner or the like of a rear exhaust type combustion apparatus for cooking pottery.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a rear-exhaust-type combustion apparatus for cooking grilled food has been used for cooking grilled fish such as grilled fish, which is generally referred to as a grill. There is known a device in which a surface combustion burner is disposed so as to face the above-mentioned material to be burned.
[0003]
The surface combustion burner 1 is, for example, as shown in FIG. 4, a flat box-shaped gas-mixing pipe 2 that mixes gas ejected from a nozzle (not shown) with primary air to supply a gas mixture. A combustion plate 41 made of a ceramic molded body is attached so as to cover one surface of the gas burner main body 3. As shown in FIG. 5, in the surface combustion burner 1, a gap between the gas burner main body 3 and the combustion plate 41 forms a gas passage 5 for flowing a gas mixture supplied from the gas mixing pipe 2. Since the combustion plate 41 is made of a ceramic molded body and does not transmit gas by itself, a large number of small-diameter flame ports 6 penetrating the combustion plate 41 are provided to eject and burn the gas mixture.
[0004]
In the burning device for cooking pottery, the object to be baked is uniformly baked and cooked with a small amount of heat, and the flame port 6 is made uniform so that the heat distribution on the surface of the combustion plate 41 is uniform so that the object to be baked is not locally heated. It is desired to arrange.
[0005]
In order to make the heat distribution on the surface of the combustion plate 41 uniform, first, it is conceivable to provide the flame port 6 on the entire surface of the combustion plate 41. However, the combustion plate 41 does not permeate the gas itself as described above, and the gas mixture does not burn except at the opening of the flame port 6, so that the gas mixture blows out stably. Therefore, in order to obtain a sufficient amount of heat, it is necessary to arrange such that the adjacent flame ports 6 are heated by mutual combustion heat. Therefore, if the flame port 6 is provided on the entire surface of the combustion plate 41 at intervals at which the gas mixture stably burns, the combustion heat becomes excessive and the material to be burned is easily overheated. It is also conceivable to adjust the heat of combustion by increasing the interval between the flame ports 6 to reduce the total number of flame ports 6 provided on the combustion plate 41. It is difficult to heat, and combustion may be unstable.
[0006]
Therefore, as shown in FIG. 4, a strip-shaped portion 42 in which a plurality of flame ports 6 in which a large number of flame ports 6 are formed at predetermined intervals is disposed on the surface of a combustion plate 41, and the flame ports 6 are formed. It has been attempted to provide a missing part 43. Examples of the pattern of the band-like portion 42 in which the flame port group 7 is disposed include Japanese Patent Publication No. 52-2485, Japanese Patent Publication No. 52-2486, Japanese Patent Application Laid-Open No. 1-123908, and Japanese Patent Application Laid-Open No. 1-123909. Some have been suggested.
[0007]
The patterns described in JP-B-52-2485 and JP-B-52-2486 are formed by vertically and horizontally combining strips parallel to the outer periphery of a combustion plate. The pattern described in JP-A-1-123908 is It comprises a strip portion parallel to the diagonal line of the plate and a strip portion interconnecting the strip portions, and the pattern described in Japanese Patent Application Laid-Open No. 1-123909 is along the flow direction of the combustion exhaust gas of the combustion plate. It consists of a meandering strip.
[0008]
However, when the flame port group 7 is provided on the combustion plate 41 made of a ceramic molded body as described above, combustion is performed only in the band-shaped portion 42 in which the flame port group 7 is provided. Since no combustion is performed in the non-formed portion 43, the temperature difference between the combustion portion and the non-combustion portion is large, and in order to make the heat distribution on the surface of the combustion plate 41 uniform, as described in the above publications. However, there is a disadvantage that various patterns of band portions 42 must be tried.
[0009]
[Problems to be solved by the invention]
SUMMARY OF THE INVENTION An object of the present invention is to provide a surface combustion burner in which the arrangement of a flame port for making the heat distribution on the surface of a combustion plate uniform can be easily solved by solving such a disadvantage.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, the surface burning burner of the present invention is formed by laminating a heat-resistant fiber as it is or by impregnating a binder with a heat-resistant fiber and laminating it by a papermaking method. and it will be, to the combustion plate is Si-C-O-based silicon carbide fibers heat-resistant fibers coated with silicon carbide, combustion plate flame port number of flame ports through are formed at predetermined intervals A group is provided and mainly burns when gas is blown out from the group of flame ports during combustion, and a gas is blown out from a gap between the fibers during combustion when the group of flame ports is not formed and combustion is performed secondarily. And a part to be provided.
[0011]
In the surface burning burner according to the present invention, the heat-resistant fiber is a Si-CO-based silicon carbide fiber coated with silicon carbide. As such, a flexible continuous filament yarn such as a Si-CO-based silicon carbide fiber having a composition of SiC _1.26 O _0.42 (Nicalon (trademark), manufactured by Nippon Carbon Co., Ltd.) is used. A material coated with silicon carbide by a vapor deposition method (abbreviated as CVD method) or a chemical vapor infiltration method (abbreviated as Chemical Vapor Infiltration, CVI method) is used.
[0012]
The combustion plate is, for example, a Si—C—O-based silicon carbide fiber having a diameter of 9 to 25 μm and a density of 2.0 to 3.0 g / cm ³ as it is or as water, a ceramic adhesive, a synthetic resin adhesive [for example, , Polyvinyl alcohol (PVA)] or the like, and laminated (by a papermaking method), filled into a mold having a predetermined shape, and then pressed to form a molded body. The molded body is carbonized by the CVD method or the CVI method. A SiC coating having a thickness of 0.1 to 0.7 μm is formed on the surface of the fiber by coating silicon. The combustion plate has a thickness in the range of 1.0 to 6.0 mm.
[0013]
In order to provide the flame port in the combustion plate, for example, a method of drilling or punching the molded body, when forming the molded body, a projection of the shape of the flame port in the portion where the flame port is provided And a method of stacking and filling the Si-CO-based silicon carbide fiber in the mold, pressing the mold, and releasing the mold together with the protrusions.
[0014]
Further, in the surface combustion burner according to the present invention, the flame port group is arranged in a band shape on the surface of the combustion plate.
[0015]
[Action]
According to the surface burning burner of the present invention, since the combustion plate is formed by laminating the heat resistant fibers, at the time of combustion, gas is mainly ejected from the flame port group and burned, and the flame port group is formed. In the non-existing portions, gas is ejected from the gaps of the fibers and burns as a secondary part. Therefore, there is no portion that does not burn at all, and the temperature difference between the portion where the flame port group is disposed and the portion where the flame port is not formed is a surface combustion burner using a combustion plate made of a conventional ceramic molded body. Is reduced as compared with
[0016]
Further, in the surface burning burner of the present invention, the flame ports are arranged in the band-shaped portion of the surface of the combustion plate, so that the flame ports are formed in the portion where the flame ports are arranged. Adjustment of the heat distribution with the unexposed parts becomes easy.
[0017]
【Example】
Next, the surface combustion burner of the present invention will be described in more detail with reference to the accompanying drawings. FIG. 1 is a perspective view showing a surface combustion burner of the present embodiment, FIG. 2 is an end view taken along the line II-II of FIG. 1, and FIG. 3 is an explanatory sectional view showing a combustion state in the combustion plate shown in FIG. .
[0018]
As shown in FIG. 1, the surface combustion burner 1 of the present embodiment is a flat box including a gas mixing pipe 2 for mixing a gas ejected from a nozzle (not shown) and primary air to supply a gas mixture. A combustion plate 4 made of a Si-CO-based silicon carbide fiber molded body coated with silicon carbide is attached so as to cover one surface of the mold gas burner main body 3. In the surface combustion burner 1, the longitudinal direction of the surface combustion burner 1 extends from the end of the combustion plate 4 facing the side where the gas mixing pipe 2 is provided toward the side where the gas mixing pipe 2 is provided. The combustion exhaust gas flows along.
[0019]
In the combustion plate 4, as shown in FIG. 2, a gap between the gas burner main body 3 and the combustion plate 4 serves as a gas passage 5 for flowing a gas mixture supplied from the gas mixing pipe 2, and In order to eject and burn the gas mixture, the plate 4 is provided with a large number of flame ports 6 which penetrate the combustion plate 4 and communicate the inside of the gas passage 5 with the outside. The diameter of the flame port 6 is in the range of 0.8 to 1.2 mm, and is appropriately selected depending on the type of gas used. In addition, a large number of flames are formed at intervals such that the flames 6 are heated by mutual combustion heat between adjacent flames 6 so that a sufficient amount of heat is obtained to stably burn the gas to be ejected. A flame port group 7 in which the ports 6 are arranged is formed.
[0020]
The surface combustion burner 1 of the present embodiment is provided with a band-shaped portion 8 on the surface of which a flame port group 7 is disposed and a portion 9 on which the flame port 6 is not formed. As shown in FIG. 1, it is provided in a substantially rectangular shape along the outer periphery of the combustion plate 4, and the inside thereof is a portion 9 where the flame port 6 is not formed.
[0021]
The combustion plate 4 of the present embodiment has a binder of 14 μm in diameter and 2.55 g / cm ³ in density with a Si—CO—based silicon carbide fiber (Nicalon (trademark) manufactured by Nippon Carbon Co., Ltd.) and polyvinyl alcohol (PVA). After being impregnated and laminated, filled in a mold having a predetermined shape, pressed to form a 2.5 mm-thick molded body, and the molded body was coated with silicon carbide by a CVD method. An SiC film having a thickness of 0.1 to 0.7 μm is formed. Further, when forming the molded body, the combustion plate 4 of the present embodiment uses a mold having a projection having a shape of the flame port 6 at a portion where the flame port 6 is provided, and the mold includes the Si-C- After laminating, filling, and pressing O-based silicon carbide fibers by a papermaking method, the flame port group 7 is formed by a method of releasing the mold together with the protrusions. The flame port group 7 may be formed by coating the formed body with silicon carbide, and then performing drilling, punching, pressing, or the like.
[0022]
As shown in FIG. 3, the combustion plate 4 forms the main combustion flame 10 mainly by the combustion of the gas ejected from the flame group 7 of the strip portion 8, as shown in FIG. The small flame 11 is also formed in the non-formed portion 9 by the secondary combustion of the gas ejected from the gap between the fibers. Accordingly, the temperature difference between the band-shaped portion 8 where the flame port group 7 is disposed and the portion 9 where the flame port 6 is not formed is small, and the flame port 6 which makes the heat distribution on the surface of the combustion plate 4 uniform. Layout design becomes easier.
[0023]
【The invention's effect】
As is clear from the above, according to the surface combustion burner of the present invention, the flame ports can be easily arranged so as to make the heat distribution on the combustion plate surface uniform.
[Brief description of the drawings]
FIG. 1 is a perspective view showing one configuration example of a surface combustion burner of the present invention.
FIG. 2 is an end view taken along the line II-II of the surface combustion burner shown in FIG.
FIG. 3 is an explanatory sectional view showing a combustion state in the surface combustion burner shown in FIG. 1;
FIG. 4 is a perspective view showing a configuration example of a conventional surface combustion burner.
FIG. 5 is a VV end view of the surface combustion burner shown in FIG. 4;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Surface combustion burner, 3 ... Gas burner main body, 4 ... Combustion plate, 6 ... Flame port, 7 ... Flame port group, 8 ... Portion where flame port group is arranged, 9 ... Portion where flame port is not formed .

Claims (2)

A combustion plate attached so as to cover one surface of the gas burner main body is formed by laminating heat-resistant fibers as they are or by impregnating a binder with a papermaking method, and the heat-resistant fibers are coated with silicon carbide. to the combustion plate is -C-O-based silicon carbide fibers, a number of burner ports are disposed is flame hole group formed at a predetermined interval gas mainly the inflammatory port group at the time of combustion through the combustion plate A surface combustion burner comprising: a part which gushes and burns; and a part where the flame group is not formed and a gas gushes from a gap between the fibers during combustion and burns secondarily. . The surface combustion burner according to claim 1, wherein the flame ports are arranged in a band shape on a surface of the combustion plate.

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