KR100267950B1 - Broiler - Google Patents

Abstract

PURPOSE: A roaster is provided to have excellent durability while being formed by using inexpensive material. CONSTITUTION: A burning fan(7) is operated to suck air through an intake port(7a). The air passes through a fan casing(8) and an air supplying box(9) is supplied to a main burner(1) through a first air hole(10). Moreover, gas is supplied from a gas pipe(3) and a diverged gas pipe(3a) to the main burner and a pilot burner(5). By igniting the pilot burner, the air and the gas are mixed in the main burner for being injected through a flame hole(1a). In case of misfire in the main burner, a flame detect circuit detects the misfire for blocking a safety governor cork(4). Herein, a heating plate has coefficient of linear expansion similar to coefficient of linear expansion of a metal substrate. Moreover, the heating plate is formed by ceramic while having a protect coating layer with a thickness of 5-30 micrometers.

Description

Roasting

The present invention relates to a roaster for heating a heating plate provided above the gas burner with the gas burner and baking cooked foods such as chicken skewers by radiant heat radiated from the heating plate.

Conventionally, as shown in FIG. 1, the roaster which provided the heating plate 2 above the main burner 1 is known.

In the roaster, combustion air supplied from the gas pipe 3 and combustion air forcedly supplied to the main burner 1 through the primary air hole 10 by the combustion fan 7 are connected to the main burner 1. Mixed in). As shown in FIG. 2, the mixed gas 12 of the combustion air and the combustion gas is blown out of the flame hole 1a to form the flame 13 by primary combustion, thereby providing a heating plate provided above the main burner 1. (2) is heated to a high temperature. As described above, the heating plate 2 is heated by the flame 13 to generate radiant heat 14, and the radiated heat 14 fires a cooked product such as a chicken skewer, which is placed on the upper side of the heating plate 2. can do.

In the roaster, the heating plate 2 is heated to a high temperature continuously for a long time, especially in the case of a work tool. Moreover, when oil, seasoning broth, etc. which generate | occur | produce in cooked goods, such as chicken skewers, fall on the heating plate 2, the heating plate 2 will corrode on the said high temperature conditions. Therefore, the heating plate 2 is required to be corrosion-resistant against corrosion by the oil or seasoning broth under the high temperature conditions together with the heat resistance against the high temperature by the primary combustion of the main burner 1.

In the above-described conventional roaster, a Ni-based super heat-resistant alloy (e.g., Mitsubishi Material Co., Ltd., product name: HA-214, containing about 80% of Ni) as a material having both heat resistance and corrosion resistance is a heating plate ( 2) is used. However, since the Haines alloy is very expensive, the use of an inexpensive material substituted for this is desired.

In view of the above circumstances, an object of the present invention is to provide a roaster which is made of an inexpensive material and has a durable heating plate.

BRIEF DESCRIPTION OF THE DRAWINGS The system block diagram which shows the structural example of the roaster which concerns on this invention.

2 is a cross-sectional view taken along the line II-II of FIG.

3 is an enlarged view illustrating main parts of FIG. 2;

Explanation of symbols for main parts of the drawings

1-gas burner 2-heating plate

14-Radiant heat 15-Metal substrate

16-protective film layer

The roaster according to the present invention for achieving the above object is to bake the heated object by radiant heat radiated from the surface of the heating plate when the heating plate is installed above the gas burner and heated by the gas burner. The heating plate is characterized in that the protective film layer is formed on the surface of the metal substrate in a range of 5 to 30 탆 in thickness, which is made of ceramic having a linear expansion coefficient close to that of the metal substrate.

The metal substrate may be cheaper than the Haines alloy and have sufficient heat resistance as the heating plate. However, the metal substrate may be oil or seasoning broth generated from a cooked product such as a chicken skewer under such high temperature conditions. There is a risk of corrosion. Therefore, in the roaster of the present invention, by forming a protective film layer made of ceramic on the surface of the metal substrate, it is possible to impart corrosion resistance to the oil, seasoning broth, and the like.

The protective film layer is formed of a ceramic having a linear expansion coefficient close to that of the metal substrate, thereby preventing peeling from the metal substrate when heated as described above. In addition, the thickness of the protective film layer is in the range of 5 to 30 μm, thereby providing corrosion resistance to the oil and seasoning broth to the metal substrate, and cooking such as chicken skewers when heated as described above. It can generate the radiant heat necessary for the firing of water. When the thickness of the protective film layer is less than 5㎛, the corrosion resistance to the oil or seasoning broth is insufficient, and if it exceeds 30㎛, the radiant heat required for baking the cooked food such as chicken skewers may not be obtained.

In the roaster of the present invention, stainless steel or a heat resistant alloy is preferable as the metal substrate (not only having sufficient heat resistance as a heating plate but also having a low price). As said stainless steel, various stainless steels, such as a martensitic system, a ferrite system, an austenite system, two-phase stainless steel, are mentioned, for example. Moreover, as said heat-resistant alloy, various alloys, such as Hastelloy (Ni-Mo-type age-resistant hydrochloric acid alloy), Inconel (Ni-Cr-type alloy), incoloy, and nimonic, are mentioned.

The ceramic forming the protective film layer needs to have corrosion resistance against the oil, seasoning broth, and the like. In addition, in order to prevent peeling from the metal substrate, it has a linear expansion coefficient close to the linear expansion coefficient of the metal substrate, and the linear expansion coefficient changes linearly close to the linear expansion coefficient of the metal substrate from the room temperature to the use temperature range of the baking. It is desirable to. In addition, the ceramic is preferably chemically stable within the operating temperature range of the roaster in terms of durability, and is preferably rich in raw materials in terms of raw material cost.

In the roaster of the present invention, a stabilized zirconium oxide, partially stabilized zirconium oxide, aluminum oxide, a magnesium oxide-aluminum oxide mixture, a zirconium oxide-aluminum oxide mixture, a zirconium oxide-silicon dioxide mixture as ceramics satisfying the above conditions with respect to the metal substrate. One kind selected from the group consisting of, magnesium oxide, magnesium oxide-silicon dioxide mixture, calcium bromide-zirconium oxide mixture, feldspar and feldspar can be used. Herein, the stabilized zirconium oxide refers to zirconium oxide in which all the oxides such as magnesium oxide, calcium oxide, and rare earth metal oxide are added to complete cubic crystallization, and the partially stabilized zirconium oxide is added to the oxide by several% to partially Refers to zirconium oxide obtained by cubic crystallization.

The magnesium oxide-aluminum oxide mixture has a spinel (MgAl ₂ O ₄ ) crystal structure, and the magnesium oxide-silicon dioxide mixture is a clinenstatite type (Mg ₂ Si ₂ O ₆ ) or goto olivine It has a crystal structure of (forsterite) type (Mg ₂ SiO ₄ ). Moreover, nephrine, leucite, calcilite etc. are mentioned as said quasi-feldspar, As a feldspar, a feldspar, a feldspar, a caliber, etc. are mentioned.

Next, the linear expansion coefficients of the metal material and the ceramic are shown in Table 1.

Stabilized ZrO ₂ A... … … Y ₂ O ₃ : ZrO ₂ = 8: 92 (molar ratio)

Stabilized ZrO ₂ B... … … CaO: ZrO ₂ = 15: 85 (molar ratio)

Partially stabilized ZrO ₂ ... … Y ₂ O ₃ : ZrO ₂ = 4: 96 (molar ratio)

MgO.CaO mixture A... Clino Enstilite Type

MgO.CaO mixture B... Koto Olive Stone Type

In the roaster of the present invention, it is preferable to select a combination in which the expansion coefficient of the metal substrate and the ceramic expansion coefficient are approximate. As is apparent from Table 1, ferrite-based stainless steel and 8 mol% of yttrium oxide are added to the total amount. The combination with the added stabilized zirconium oxide (stabilized zirconium oxide A) is most suitable.

EMBODIMENT OF THE INVENTION Next, embodiment of this invention is described in detail, referring an accompanying drawing. BRIEF DESCRIPTION OF THE DRAWINGS It is a system block diagram which shows the structure of the roaster which concerns on this embodiment, FIG. 2 is sectional drawing II-II of FIG. 1, and FIG. 3 is an enlarged view of the principal part of FIG.

Hereinafter, the roaster of this embodiment is demonstrated, referring FIGS. 1-3.

The roaster of this embodiment is provided with the heating plate 2 above the main burner 1, as shown in FIG. The main burner 1 has a plurality of flame holes 1a formed on its upper surface facing the heating plate 2, and a gas pipe 3 is connected to the proximal end thereof. The safety governor cock 4 is provided in the middle of the gas pipe 3, and the branch gas pipe 3a is branched in the downstream of this safety governor cock 4. As shown in FIG. The pilot burner 5 and the spark plug 6 are provided in the vicinity of the main burner 1, and the branch gas pipe 3a is connected to the pilot burner 5.

Moreover, the roaster shown in FIG. 1 is equipped with the combustion fan 7, and the combustion air sucked in by the combustion fan 7 is sent from the fan casing 8 to the air supply box 9. The air supply box 9 is formed with a primary air hole 10 communicating with the main burner 1 so that the combustion air is supplied into the main burner 1 through the primary air hole 10. It is. In addition, the code | symbol 11 shown in FIG. 1 is a thermocouple which detects the misfire of the main burner 1. As shown in FIG.

In the roaster shown in Fig. 1, during the ignition operation, the combustion fan 7 first operates to suck the combustion air through the inlet 7a, and passes through the fan casing 8 and the air supply box 9 for combustion. Air is forcibly supplied into the main burner 1 through the primary air hole 10. At the same time, gas is supplied from the gas pipe 3 and the branch gas pipe 3a to the main burner 1 and the pilot burner 5.

When the ignition lamp 6 is sparked to ignite the pilot burner 5, the combustion air forced by the combustion fan 7 and the gas supplied from the gas pipe 3 are supplied to the main burner 1. The main burner 1 is ignited by mixing inside and blowing through the flame hole 1a. At this time, if the main burner 1 is misfired, the flame detection circuit (not shown) by the thermocouple 11 detects misfire and closes the safety governor cock 4 to prevent gas leakage.

When the main burner 1 is ignited, the branch gas pipe 3a is closed and the safety governor cock 4 is proportionally controlled to start normal operation.

In the roaster of the present embodiment having the above-described configuration, as shown in FIG. 2, the combustion air forcedly supplied by the combustion fan 7 and the gas supplied from the gas pipe 3 are in the main burner 1. Mixed gas 12 is blown out from the flame hole 1a of the main burner 1, thereby forming a flame 13 by primary combustion on the back surface side of the heating plate 2 that is semi-circular in cross section. As a result, the heating plate 2 is heated to a high temperature to generate radiant heat 14, and the cooked objects (not shown) such as chicken skewers placed on the upper side of the heating plate 2 can be fired by the radiant heat 14. have.

When the cooked product is baked by baking, oil or seasoning broth is dropped from the cooked product onto the heating plate 2, but the heating plate 2 may be corroded by the oil or seasoning broth under high temperature conditions. Therefore, in the roaster of the present embodiment, as shown in Fig. 3, the protective film layer made of ceramic having a linear expansion coefficient close to the linear expansion coefficient of the metal substrate 15 on both surfaces of the metal substrate 15 ( 16) was formed to a thickness in the range of 5 to 30 µm. In addition, the protective film layer 16 may be formed only on the surface of the metal substrate 15 that faces the workpiece.

In the present embodiment, when the protective film layer 16 made of the ceramic is formed on the surface of the metal substrate 15, first, the surface of the metal substrate 15 is roughened, and then degreased, washed and so on. After drying, it is precipitated for about 15 seconds in the slurry of the ceramic material prepared in advance. Then, the metal substrate 15 is removed from the slurry of the ceramic material, the slurry of the ceramic material attached to the surface of the metal substrate 15 is dried by cold air, and then fired at a temperature of 1100 to 1500 ° C. for 2 hours to form a protective coating layer. 16 is formed.

The surface roughening of the metal substrate 15 can be performed by, for example, finishing with sandpaper of about # 240 along the longitudinal direction of the metal substrate 15. As described above, the metal substrate 15 whose surface is roughened can be degreased and washed by ultrasonic cleaning in acetone for about 3 minutes, and can be dried by leaving it at room temperature for about 10 minutes after washing.

The slurry of the ceramic material was wet-mixed with a water mill and a powder of the ceramic material together with water and a dispersant for 16 hours by a ball mill, followed by further wet mixing with a ball mill for 10 minutes with a predetermined amount of 10% polyvinyl alcohol as a binder, and 10 ^-3 It can prepare by standing still for 15 minutes under reduced pressure of about Thor, and removing a bubble. At this time, the thickness of the protective film layer 16 formed by adding or subtracting the addition amount of water can be adjusted. As described above, in order to set the thickness of the protective film layer 16 to 5 to 30 μm, the powder of the ceramic material is 45 to Add about 60% by weight of water.

In addition, when the protective film layer 16 is formed only on the surface of the metal substrate 15 that faces the workpiece, the metal substrate 15 is precipitated in the slurry of the ceramic material, removed from the slurry, and then adhered to the opposite surface. What is necessary is just to wash off the slurry of the said ceramic material.

(Example)

In this embodiment, after the high temperature oxidation resistant ferritic stainless steel (manufactured by Ilshin Steel Co., Ltd., product name: NCA-1) is used as the metal substrate 15, the surface is roughened with sandpaper of # 240 along the longitudinal direction thereof. It was degreased and washed by ultrasonic washing in acetone for 3 minutes. After washing, the mixture was left to stand at room temperature for 10 minutes and dried.

Subsequently, a ball mill was added for 16 hours with 56% by weight of water and 2% by weight of a dispersant to the yttrium-stabilized zirconium oxide powder (manufactured by Dong-Soo Co., Ltd., yttrium oxide: zirconium oxide = 8:92, molar ratio) having an average particle diameter of 0.5 µm. Wet mixing. Then, 10% polyvinyl alcohol was added to the yttrium-stabilized zirconium oxide powder by 20% by weight, and the mixture was further wet mixed for 10 minutes by a ball mill. Then, a slurry of ceramic material was prepared by standing still for 15 minutes under a reduced pressure of 10 ^-3 Torr to remove bubbles.

As described above, the surface roughened metal substrate 15 is precipitated in the slurry for 15 seconds, taken out of the slurry and dried in cold air, and then fired at a temperature of 1150 ° C. for 2 hours, thereby allowing the metal substrate 15 to be placed on both surfaces of the metal substrate 15. It was set as the heating plate 2 which forms the protective film layer 16 of thickness about 12 micrometers which consists of yttrium stabilized zirconium oxide.

When the heating plate 2 was mounted on the apparatus shown in FIG. 1 and burned, the chicken skewers could be cooked under the condition of a surface temperature of 895 ° C. of the heating plate 2 and an emissivity of 88% of the heating plate 2. At this time, even if the oil or seasoning broth fell from the chicken skewers on the heating plate 2, white lead did not occur, and the marks such as oil or seasoning broth were formed on the protective film layer 16 of the heating plate 2. The heating plate 2 was not corroded by the oil or the seasoning broth.

Moreover, since the heating plate 2 of a present Example can be used for 3700 hours (equivalent to 1 year and 3 months using 8 hours a day) under the said conditions, it is clear that it is excellent in durability.

As described in detail above, according to the present invention, it is possible to provide a roaster comprising a heating plate made of an inexpensive material and having excellent durability.

Claims (1)

A heating plate is provided above the gas burner, and when the heating plate is heated by the gas burner, the heating plate is baked by the radiant heat radiated from the surface of the heating plate, wherein the heating plate is formed on the surface of the metal substrate. It has a coefficient of linear expansion that is close to the coefficient of linear expansion of a metal substrate, and is stabilized zirconium oxide, partially stabilized zirconium oxide, aluminum oxide, magnesium oxide-aluminum oxide composite, zirconium oxide-aluminum oxide composite, zirconium oxide-silicon dioxide composite, magnesium oxide, magnesium oxide It is composed of one type of ceramic selected from the group consisting of silicon dioxide composite, calcium bromide-zirconium oxide composite, quasi-feldspar and feldspar, and has a protective film layer in the range of 5 to 30 μm in thickness. Grilling.

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