JP2940518B2 - Combustion plate, method for blackening the same, and burner using the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for blackening a combustion plate, and a burner using the same, and more particularly to an infrared burner utilizing radiant heat generated by combustion.

[0002]

2. Description of the Related Art Burners using a conventional blackening method are:
There was one as described in JP-A-8-54107. This burner, as shown in FIG.
Heating an aluminum-plated steel plate provided with a large number of flame ports 52 as a combustion plate 51 to form an infrared radiation film of an alloy layer of Fe and Al on the surface, the blackened combustion plate 51 is used as a burner body. In this configuration, the radiant heat is radiated from the infrared radiating film heated by the surface combustion on the combustion plate.

Another conventional blackening method is disclosed in Japanese Patent Application Laid-Open No. Hei 8-138540. In this blackening treatment method, a metal material is put into a blackening treatment furnace after press molding, the press molding oil is decomposed and removed at 300 to 400 ° C., and then the temperature in the furnace is increased before blackening treatment. Was.

[0004]

However, the conventional blackening method and the burner using the same are characterized in that an aluminum-plated steel sheet is heated to 700 to 800 ° C. to form an infrared radiation film of an alloy layer of Fe and Al on the surface. In general, aluminum-plated steel sheets have the best corrosion resistance in the unheated state, and the Fe-Al alloy layer formed after heating becomes microscopically porous. The steel plate part of the base material is partially exposed on the surface. In particular, when this was used as a burner, the base where the flame port 52 was formed was completely exposed, and the corrosion resistance itself tended to decrease.
Further, not only squeak noise is generated due to thermal expansion due to surface combustion in the combustion plate 51 or shrinkage during fire extinguishing,
The exfoliation of the alloy layer is promoted, and the corrosion resistance as a whole is reduced. When such a burner is used in a baking cooker, the flame 52 may be corroded and clogged by prolonged use. There was a problem that there is.

On the other hand, in other conventional blackening methods,
Under the conditions for decomposing press molding oil in the temperature range of 00 to 400 ° C., there is a tendency that the oil component is relatively easily tarified rather than being decomposed by combustion. Furthermore, after decomposing the press molding oil,
In order to raise the temperature inside the furnace, there was a problem that the blackening treatment was performed in two stages, and so-called batch processing was performed, and the efficiency was reduced.

[0006]

In order to solve the above-mentioned problems, the present invention uses a heat-resistant and corrosion-resistant steel sheet as a raw material, and provides a combustion surface with a flame opening in a fixed pattern, and then deposits oil on the surface. , Heated in the atmosphere at 700 to 900 ° C. to form an oxide film on the surface of the combustion plate.

[0007] Austenitic stainless steel containing 18% or more of Cr and 18% or more of Ni is used as a heat and corrosion resistant steel sheet.

According to the above invention, oil adhering to the surface of the combustion plate is burned in the atmosphere at 700 to 900 ° C., so that CO 2 and CO are mixed in the vicinity of the surface of the combustion plate for a certain period of time, resulting in a low oxygen concentration state. When FeO or Fe3O4 is selectively formed and the oil component is almost completely burned, Fe2
Since O3, Cr2O3, NiO, and the like gradually begin to form, an oxide film having a grayish black color as a whole is formed. At this time, the heating can be performed in a state where the temperature is almost constant at 700 to 900 ° C., so that the blackening process can be performed in one stage, and the above-mentioned temperature zone is the same temperature zone as a normal enamel processing furnace. No dedicated processing facility is required.

Further, the blackened combustion plate has a high C
With r and high Ni, heat resistance and corrosion resistance that can withstand long-term combustion can be secured.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention uses a heat-resistant and corrosion-resistant steel plate as a material of a combustion plate, and provides a flame surface in a fixed pattern on a combustion surface.
Heated in air at a temperature of ° C. to form an oxide film on the surface.

Then, the vicinity of the surface of the combustion plate is brought into a low oxygen concentration state by mixing CO2, CO, etc. by burning oil for a certain period of time to selectively form FeO and Fe3O4, and then to form Fe2O3, Cr2O3, and NiO. Blackening can be realized by the formation of an oxide film that is entirely grayish black. Further, since the temperature is almost constant at 700 to 900 ° C., not only can the blackening process be performed in one step,
Since the above-mentioned temperature zone is the same as that of a normal enamel processing furnace, a dedicated processing facility is not required.

Further, after a heat-resistant and corrosion-resistant steel plate is used as a material for the combustion plate, and a flame surface is provided in a predetermined pattern on a combustion surface, the flame is heated.
It is an oxide film formed on the surface by heating at 0 to 900 [deg.] C. in a constant low oxygen concentration atmosphere from the atmosphere.

By forming a constant low oxygen concentration atmosphere, an oxide film having a stable color tone can be formed on the surface regardless of the presence or absence of oil on the combustion plate.

Further, the heating time is 3 to 10 minutes. Further, a flame port is formed in a heat-resistant and corrosion-resistant steel sheet in a state where an oxide film generated in a rolling step of a material of a combustion plate is left in a range of 10 to 20 μm.

[0015] Since an extremely thin oxide film is left, the influence on the mold at the time of forming the flame port can be reduced, so that it is not necessary to newly blacken the combustion plate, and the cost can be reduced.

The material of the combustion plate is a heat-resistant and corrosion-resistant steel plate made of austenitic stainless steel of 18% or more of Cr and 18% or more of Ni.

[0017] With the composition of high Cr and high Ni, it is possible to obtain a combustion plate capable of securing heat resistance and corrosion resistance that can withstand long-term combustion.

The oxide film is made of FeO, Fe3O4,
It contains a compound selected from metal oxides of Fe2O3, Cr2O3, and NiO.

An oxide film containing these oxides as components can realize an infrared radiation film having good radiation performance.

Further, the burner using the combustion plate comprises a partition plate which slidably sandwiches one end of the combustion plate via a cushioning material, and a burner body, and the combustion plate and the partition plate are fitted to the burner body. A fuel mixing pipe portion is formed between the partition plate and the burner main body, and a fuel premixing gas diffusion portion is formed between the combustion plate and the burner main body.

Since the infrared radiation film is formed on the combustion plate, good heat can be radiated from the combustion surface as radiant heat during combustion, so that excessive red heat due to heat accumulation on the combustion surface can be prevented. Since one end of the combustion plate is slidably sandwiched between the partition members via the cushioning material, gas leakage is prevented, stress due to repeated thermal expansion and contraction is absorbed to ensure durability, and at the same time, squeaking noise Can be reduced.

In the burner using the combustion plate, the combustion plate and the burner main body are fitted to each other, and a mixing pipe portion and a diffusion portion of the fuel premixed gas are formed between the combustion plate and the burner main body. Things.

Since the mixing tube and the diffusion portion are formed adjacently to each other with the two parts of the combustion plate and the burner body, a compact burner with a small number of parts can be obtained.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. (Embodiment 1) FIGS. 1A and 1B are an external view and a cross-sectional view of a main part of a combustion plate according to Embodiment 1 of the present invention.

In the figure, a combustion plate 1 is made of a heat-resistant and corrosion-resistant steel plate 2.
Austenitic stainless steel plates of 20% Cr, 20% Ni, and 2% Mo (for example, N
AR-AH1) as a material, and in the form of a flat plate, punching processing oil (for example, "G619", "G6
No. 210, a one-to-one mixed oil, appearance: a colorless or pale yellow transparent liquid), and a flame 4 is provided in a fixed pattern on the combustion surface 3, and then a press molding oil (for example, Nippon Oil's Nisseki Unicut TB45 ”, appearance: colorless or pale yellow transparent liquid, viscosity (30 ° C.): 47.1 cSt, flash point: 16
(0 ° C.)) and heated in the atmosphere at 700 to 900 ° C. for about 4 minutes while keeping the oil mixed with the above-mentioned punching oil and press forming oil adhered to the surface. This is a blackening method in which an oxide film 5 is formed on the substrate. As the heating furnace, a tunnel furnace for enamel processing of about 8 m is used, and the heating temperature is preferably 810 to 850 ° C.

Next, the operation and the operation will be described.
CO and the like are mixed to form a low oxygen concentration state, and FeO or Fe3O4 is selectively formed on the surface of the combustion plate 1;
2O3, Cr2O3, and NiO are formed, and blackening can be realized by forming an oxide film 5 having a grayish black color as a whole. Further, the oxide film 5 is formed up to the inner surface of the flame outlet 4. At this time, the emissivity of the surface of the combustion plate 1 on which the oxide film 5 is formed becomes 0.5 or more.
Good heat can be dissipated and excessive red heat can be suppressed. Further, the temperature is 700 to 900 ° C (preferably 810 to 850).
℃), so that not only can the blackening process be performed in one step, but also the above-mentioned temperature zone is the temperature zone used in a normal enamel processing furnace, so no special processing facility is required It is.

Embodiment 2 The difference from Embodiment 1 is that the oxygen concentration in the heating atmosphere is adjusted to a low oxygen concentration of about 15 to 10% regardless of the presence or absence of oil on the surface of the combustion plate 1. . The oxygen concentration is adjusted by mixing combustion exhaust gas into the heating atmosphere.

Next, the operation and function will be described. Even if the combustion plate 1 is manufactured without using the punching oil and the press molding oil, the surface can be stabilized by forming the low oxygen concentration atmosphere. An oxide film 5 having a desired color tone can be formed. At this time, the emissivity of the surface of the combustion plate 1 can be secured to 0.5 or more, which is almost the same as that of the first embodiment.

(Embodiment 3) FIGS. 2A and 2B are a block diagram of a method for blackening a combustion plate according to a third embodiment of the present invention and a sectional view of a main part of the combustion plate.

The components having the same reference numerals as in the first embodiment have the same structure, and the description is omitted. In the figure, after cold rolling the raw steel in Example 1 at 1050-1100 ° C, 3
A heat treatment is performed for one minute to form an oxide film 6 having a thickness of about 10 to 20 μm and then coiled to form a heat-resistant and corrosion-resistant steel plate 7, and a flame plate 4 to form a combustion plate 8.

Next, the operation and action will be described. The thickness of the oxide film 6 is as thin as about 10 to 20 μm, and even if the punching process for forming the flame port 4 is performed, the effect on the punching die is small. it can. The usual rolling steps are cold rolling, heat treatment at 1050 to 1100 ° C., pickling, skin purse rolling, and coiling. In the case of the present embodiment, the steps of pickling and skin purse rolling can be omitted. In addition, since the heat treatment after the formation of the flame port 4 becomes unnecessary, the manufacturing process of the combustion plate 8 can be shortened and the manufacturing cost can be reduced.

(Embodiment 4) FIGS. 3A and 3B are an external view and a sectional view of a main part of a burner A according to Embodiment 4 of the present invention.

The components having the same reference numerals as in the first embodiment have the same structure, and the description is omitted. In the figure, burner A is
The burner body 11 includes a partition body 10 that sandwiches one end of the combustion plate 1 in Example 1 via a cushioning member 9 made of a compressible ceramic fiber molded body, and the burner body 11. Mating, partition body 10
And a burner main body 11, a mixing pipe portion 12 of the fuel premixed air is formed, and a fuel premixed air diffusion portion 13 is formed between the combustion plate and the burner main body.

Next, the operation and function will be described. Since the oxide film 5 is formed on the combustion plate 1 as an infrared radiating film, good heat can be radiated from the combustion surface 3 as radiant heat during combustion. 3 can prevent excessive red heat, and furthermore, since one end of the combustion plate 1 is slidably sandwiched between the partition members 10 via the cushioning material 9, gas leakage is prevented, and thermal expansion and contraction occur. Even in the repetition of the above, prevent gas leakage, absorb heat stress and ensure durability,
At the same time, squeak noise can be reduced.

(Embodiment 5) FIGS. 4A and 4B are an external view and a sectional view of a main part of a burner B according to Embodiment 5 of the present invention.

In the figure, the difference from the fifth embodiment is that the same heat-resistant and corrosion-resistant steel plate 2 as in the first embodiment is used, and the combustion plate 14 and the burner main body 11 on which the oxide film 5 is formed by the same blackening treatment method as in the first embodiment. The fuel mixing tube 12 and the diffusing portion 13 of the fuel pre-mixture are formed adjacent to each other between the combustion plate 14 and the burner main body 11.

The components having the same reference numerals as those in the first embodiment have the same structure, and a description thereof will be omitted. Next, the operation and action will be described. A compact burner having a small number of parts can be obtained by being composed of two parts, the combustion plate 14 and the burner main body 11, and by forming the mixing pipe part 12 and the diffusion part 13 adjacent to each other. .

[0038]

As described above, according to the present invention, the following effects can be obtained.

That is, according to the first aspect of the present invention, a heat-resistant and corrosion-resistant steel plate is used as a material for a combustion plate, a flame surface is provided in a fixed pattern on a combustion surface, and oil is adhered to the surface. By heating in the air at 700 to 900 ° C. to form an oxide film on the surface, not only can the blackening treatment be performed in one step, but also the above-mentioned temperature zone is at a temperature similar to that of a normal enamel processing furnace. Since it is a belt, a dedicated processing facility is not required.

According to the second aspect of the present invention, there is provided
By heating in an atmosphere at a constant low oxygen concentration at a temperature of 00 to 900 ° C. and lower than the atmosphere, an oxide film was formed on the surface,
By forming a constant low oxygen concentration atmosphere, an oxide film having a stable color tone can be formed on the surface regardless of whether or not oil has adhered to the combustion plate.

According to the fourth aspect of the present invention, the oxide film generated in the rolling step of the raw material of the combustion plate has a thickness of 10 mm.
By forming a flame port on the heat-resistant and corrosion-resistant steel sheet in a state where it remains in a range of up to 20 μm, it is possible to reduce the influence on the mold when forming the flame port by leaving a very thin oxide film, There is no need to newly blacken the combustion plate, thereby shortening the manufacturing process and reducing costs.

According to the fifth aspect of the present invention, the material of the combustion plate is a heat-resistant and corrosion-resistant steel plate having a Cr content of 18% or more.
By using an austenitic stainless steel of 18% or more of Ni, a combustion plate capable of securing heat resistance and corrosion resistance that can withstand long-term combustion due to the composition of high Cr and high Ni can be obtained.

According to the invention of claim 7, the burner using the combustion plate is composed of a partition plate which sandwiches one end of the combustion plate via a buffer, and a burner main body. The partition plate is fitted to the burner body, a mixing pipe portion of the fuel premix is formed between the partition plate and the burner body, and a diffusion portion of the fuel premix is formed between the combustion plate and the burner body. As a result, since the infrared radiation film of the oxide film is formed on the combustion plate, good heat can be radiated from the combustion surface, and further, one end of the combustion plate is slidably sandwiched between the partition members via the cushioning material. Therefore, gas leakage can be prevented, durability against repeated thermal expansion and contraction can be secured, and at the same time, squealing noise can be reduced.

According to the eighth aspect of the present invention, a burner using the combustion plate is provided by fitting the combustion plate and the burner body, and mixing the fuel premixed gas between the combustion plate and the burner body. By forming the pipe portion and the diffusion portion adjacent to each other, it is possible to obtain a compact burner with a small number of components composed of the combustion plate and the burner body.

[Brief description of the drawings]

FIG. 1A is a plan view of a combustion plate using a blackening method according to a first embodiment of the present invention. FIG.

2A is a block diagram of a blackening method according to a third embodiment of the present invention. FIG. 2B is a sectional view of a main part of a combustion plate using the blackening method.

FIG. 3A is a plan view of a burner according to a fourth embodiment of the present invention. FIG.

FIG. 4A is a plan view of a burner according to a fifth embodiment of the present invention. FIG.

FIG. 5 is a plan view of a burner using a conventional blackening method.

[Explanation of symbols]

 A, B Burner 1, 8, 14 Combustion plate 2, 7 Heat-resistant and corrosion-resistant steel plate 3 Combustion surface 4 Flame 5, 6 Oxide film 9 Buffer material 10 Partition body 11 Burner main body 12 Mixing pipe section 13 Diffusion section

────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Kenji Matsui 1006 Kazuma Kadoma, Kadoma City, Osaka Inside Matsushita Electric Industrial Co., Ltd. (56) References JP-A-9-229562 (JP, A) JP-A-9- 41086 (JP, A) JP-A-8-54107 (JP, A) JP-A-8-138540 (JP, A) JP-A-52-52240 (JP, A) Japanese Utility Model Application No. Sho 61-175721 (JP, U) JP-B-58-17368 (JP, B2) (58) Field surveyed (Int. Cl. ⁶ , DB name) F23D 14/12-14/18 F24C 15/24

Claims (8)

(57) [Claims] 1. A heat-resistant and corrosion-resistant steel plate is used as a material, and a flame surface is provided in a fixed pattern on a combustion surface. Then, the surface is heated in an atmosphere of 700 to 900 ° C. with oil adhered to the surface. A method for blackening a combustion plate having an oxide film formed thereon. 2. A heat-resistant and corrosion-resistant steel plate is used as a raw material, and a flame surface is provided in a predetermined pattern on a combustion surface, and then heated at 700 to 900 ° C. in an atmosphere having a constant low oxygen concentration than the atmosphere to form an oxide film on the surface. A blackening method for a combustion plate formed with the above. 3. The method according to claim 1, wherein the heating time is 3 to 10 minutes. 4. An oxide film generated in the rolling step has a thickness of 10 mm.
A blackening treatment method for a combustion plate in which a flame port is formed in a heat-resistant and corrosion-resistant steel plate in a state of remaining in a range of up to 20 μm. 5. The heat-resistant and corrosion-resistant steel sheet according to claim 1, wherein Cr is 18% or more.
5. The combustion plate according to claim 1, wherein austenitic stainless steel of 18% or more of Ni is used. 6. An oxide film comprising FeO, Fe3O4, Fe2
The combustion plate according to any one of claims 1 to 5, comprising a compound selected from metal oxides of O3, Cr2O3, and NiO. 7. A combustion plate according to claim 1, comprising a combustion plate, a partition plate sandwiching one end of the combustion plate slidably through a heat insulating material, and a burner body. A burner in which a fuel premixed gas mixing pipe portion is formed between the partition plate and the burner main body, and a fuel premixed gas diffusion portion is formed between the combustion plate and the burner main body. 8. A burner comprising the combustion plate according to claim 1 and a burner main body, wherein a mixing pipe portion and a diffusion portion of a fuel premixture are formed between the combustion plate and the burner main body.