JPS61240033A - Cooking apparatus - Google Patents

Abstract

PURPOSE:To provide a cooking apparatus excellent in corrosion resistance and durability and having an infrared ray radiating member of a high radiation efficiency by using as a radiating member an inorganic heat resisting fiber having a property of being immediately heated and changing the opening degree depending on a part to be red-heated and a part out of which an exhaust gas flows. CONSTITUTION:For a cloth 7 of inorganic heat-resisting fiber silicon carbide, alumina, silica, thirano fiber and the like. Since these materials have affluent flexibilities, they can be formed into various shapes. Further, since they are long fibers and fine filaments of approximately 10mum, it is advantageous in that their heat capacities are small and the temperature thereof become 900-1000 deg.C within several seconds after heating. The opening degree of incandescent portions of the radiating members is preferably 15%-60%. At the exhaust air hole parts have the opening degree which is greater than that of the incandescent portion so that the flow of the exhaust gas becomes smooth. A coating material formed by dispersing an infrared radiating material such as a metal oxide, carbide and nitride using as a binder an organic silicon polymer mainly composed of a borosiloxane resin, is employed on the surface of the cloth thereby to apply a coating of a approximately 10-30mu on a part or the entire part of the radiating member and further to improve the infrared ray radiation ratio.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to cooking appliances such as gas staples and gas open cookers that heat and cook food by heating by burning gas and emitting infrared rays.

Conventional technology Conventionally, a burner called a Schwank burner uses a ceramic plate as a burner and has a large number of small holes formed in a honeycomb shape, from which premixed fuel and air are ejected and burns on the surface to generate red heat. There are also burners that use enameled metal plates instead of ceramic plates and burn in the same way, producing red heat.Furthermore, metal is used as the radiator, and wire mesh or lath is used to lower the heat capacity. There is a method of using it as a secondary radiator in the form of a net, punched metal, etc. It is widely used because it is secondarily heated with a burner, becomes red hot, and emits infrared rays.

Problems to be Solved by the Invention Those using Schpunk burner type ceramics and mink plates are easily broken and powdered due to heat shock, are extremely expensive because the ceramic is molded through a complicated process, and cannot be completely predicted. Since it is used for mixing, the combustion amount adjustment is limited to about 10φ, so it is not possible to reduce the firepower too much.
Furthermore, since it is a planar heating element, the radiation distribution is uneven, and there are various problems such as excessive scorching due to the direct flame of the burner.

The type that uses the same method to enamel metal has many problems, such as heating from high temperatures, peeling of the enamel due to the heat shock of cooling, corrosion of the metal substrate, and durability.

Next, secondary radiators that heat metal with a burner and make it red hot are metal, so the surface oxidizes and deteriorates, which is the biggest problem with durability, and it also emits infrared radiation. Problems include poor radiation efficiency due to the low rate, and if the wire diameter is made thinner or thinner in an attempt to achieve rapid heating, the temperature will increase but the strength will decrease, leading to deformation and even lower durability. There is.

The present invention solves the above-mentioned conventional problems, and provides a cooking appliance having an infrared radiator with high radiation efficiency that emits strong infrared rays that are corrosion resistant and durable, and have excellent combustion characteristics. With the goal.

11 Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a burner and a radiator which is placed in the vicinity of the burner and which is secondarily heated by the burner. In a cooking device consisting of a culture chamber with an exhaust hole, the aperture ratio of the red-hot part of the radiator is 15
~60%, and the porosity between the radiators in the part looking into the exhaust hole is the same as that of the open holes in the red-hot part, and one part of the surface of the radiator of this heat-resistant fiber cloth Part or all of the material is coated with a coating material in which an infrared emitting material is dispersed in an organosilicon polymer whose main component is a borosiloxane resin.

Effect: According to the above means, it has excellent heat resistance and corrosion resistance, and the burner flame is cooled by the arrangement of the radiator, and the generation of carbon monoxide etc. caused by incomplete combustion due to damage to the flow of exhaust gas is avoided. In addition, a cooking device having a radiator with high infrared radiation efficiency can be obtained without any abnormalities such as.

Inorganic heat-resistant fibers have a small heat capacity and are excellent in quick heating properties, quickly becoming red hot in the burner flame and emitting strong infrared rays. Organosilicon polymer is mainly composed of borosiloxane, and when heated and cured, it has a skeleton of Si, B, and O, and has excellent heat resistance and thermal shock resistance. It is particularly suitable as a binder because it does not cause any oxidation or peeling. Since the material with excellent infrared radiation is dispersed, the radiation efficiency is further increased.

Placing a material with a large heat capacity, such as a metal, within the burner flame cools the flame and causes incomplete combustion. This leads to the generation of carbon monoxide (CO), etc., but as in the present invention, inorganic heat-resistant fibers with good quick heat properties are used, and the aperture ratio is changed between the red-hot area and the exhaust gas flow area, so this is not a problem. There is no possibility of complete combustion or a decrease in radiation efficiency.
In addition, the red-hot surface is not narrowed to the north more than necessary, and the heating efficiency is not degraded at all, making it suitable as a radiator for cooking appliances.

EXAMPLE An example of the present invention will be described below with reference to the drawings. Fig. 2 shows a perspective view of the gas staple. In the figure, 1 is the grill room used for purposes such as grilling fish.
2 is the stove burner, and a is the ignition knob. FIG. 1 is an enlarged sectional view of the main part.

In the figure, 4 is a top plate, 5 is an exhaust hole cover, 6 is a tray, and 7 is a cloth in which inorganic heat-resistant fibers are braided, in which infrared ray emitting material is dispersed, and an organosilicon material whose main component is borosiloxane. A radiant body 8 is coated with a polymer, and numeral 8 is a cooking grid on which food 9 such as fish to be cooked is placed, and numeral 10 is burned with a Bunsen burner to form a flame 11. The radiator 7 becomes red hot due to combustion in the burner 10 and emits infrared rays. The radiator 7 is placed near the Bunsen burner 10 and a portion thereof is placed within the flame 11.

At this time, the radiator 7 is heated and maintained in a red-hot state, but during cooking, it becomes exposed to a harsh corrosive environment such as salt, water vapor, oil and fat, etc. However, cloth made of inorganic heat-resistant fibers is used. Therefore, there is no problem in corrosion resistance and heat resistance. As the inorganic heat-resistant fiber cloth, silicon carbide, alumina, silica, tyranno fiber, etc. can be used and can be selected arbitrarily. Since these fiber cloths are highly flexible, they can be used in various shapes. Furthermore, since these are long fibers and thin filaments of about 10 μm and have a small heat capacity, they are convenient because they can be heated to a high temperature of 900° C. to 1000° C. within a few seconds after heating.

Weaving methods include plain weave, satin weave, and Moshiya weave, but are not particularly limited to these.

When heating a radiant in a flame near a burner, when the exhaust gas flow is not smooth due to resistance, and especially when used indoors, CO must not be generated due to incomplete combustion. In addition, especially when used as a radiator for secondary heating, the red-hot area is also important. No matter how high the temperature of the red-hot area is, if the red-hot area is narrow, sufficient cooking performance will not be obtained.On the other hand, if you emphasize the red-hot area and make it wider than necessary, the flame will not be formed sufficiently and incomplete combustion as mentioned above will occur. This will cause CO generation. Radiant 1
Due to the above-mentioned reasons, the aperture ratio of the red-hot part is 15% ~
60 inches is appropriate, and in order to ensure smooth flow of exhaust gas in the portion leading into the exhaust hole, it is appropriate to have an aperture ratio greater than that of the red-hot portion. It is desirable that the radiator has such an aperture ratio from the viewpoints of combustibility, red hot area, economical efficiency of the material, and the structure of the radiator. Regarding the infrared emissivity of the inorganic heat-resistant fiber cloth, silicon carbide fibers have a high absorption coefficient on the order of 10 to 10 mm-' for the entire infrared wavelength range. Furthermore, since the scattering coefficient is expected to be on the order of about 10 mm', the infrared radiation behavior consists only of surface reflection for the entire infrared wavelength range. Therefore, the wavelength dispersion of the refractive index is related to the infrared radiation behavior. Since the refractive index is as high as 2.65 in the wavelength range of 10 μm or less, there is surface reflection of about 2011, and the infrared emissivity is about 0.8. Also 10μm
Above that, the refractive index increases and the infrared emissivity decreases. This is a disadvantageous characteristic because the absorption band of most foods is in this far-infrared wavelength region of 10 μm or more.

In order to compensate for this, the present invention has developed a coating in which infrared emitting materials such as metal oxides, carbides, and nitrides are dispersed on the cloth surface of inorganic heat-resistant fibers, using an organosilicon polymer mainly composed of borosiloxane resin as a binder. The infrared emissivity is further increased by coating part or all of the radiator using a material.

Borosiloxane resin is mainly composed of a polymer having the following structure. At room temperature, it has properties similar to those of organic polymers, making it suitable for use in paints, etc. When heated, it becomes a ceramic with St, B, and O as its skeleton, and is strongly bonded. Coating of inorganic heat-resistant fibers with cloth can be done by spraying, dipping, etc.
A film thickness of about 0 to 30 μm is desirable. The covering portion can be applied to a part or the entire surface depending on the configuration and arrangement method of the radiator. Since the binder itself has a refractive index of about 1.6, many surface reflections occur, making it possible to achieve high radiation north of 0.9. Metal oxides, carbides, and nitrides, specifically zirconia, titania, alumina, SiC%SiN, and Fe, are used to improve the heat resistance of the coating layer and give wavelength selectivity to the radiation characteristics.
Infrared emitting materials such as transition metal oxides such as 1Mn5Cu1Co and Ni, and rare earth element oxides can be used. The compounding ratio is preferably 100 to 600 by weight in the cured product of the borosiloxane resin. As a radiator, silica cloth [Japan Silica (-"Siliglass" (product name)] is used as a cloth made of braided inorganic heat-resistant fibers, and the opening ratio of the red-hot part is 45, while that of the part facing the exhaust hole is 6096. Regarding 100 parts of borosiloxane resin (Showa Electric Cable SMR-32), 40 parts of zirconia, 30 parts of alumina, Fe2O3・MnO
2. Mix 20 parts of CuO and 200 parts of toluene and disperse 20 parts with an attritor to make a paint. Spray it on the area excluding the exhaust hole to a thickness of about 2Sμ (after sintering) and use it as a radiator as a gas staple. The results of a comparison with a conventional example (stainless steel lath mesh) are shown in the table below.

(Note) *1 Pour 100cc of water into 15ml of grill
Rate of weight change before and after heating (a) *2 Time required to obtain the same degree of burntness when baking bread (s
ea) *3 Time required to cook two horse mackerel weighing approximately 120g (
The reason why the red-hot temperature rose in the table is because the heat capacity was small and the light absorption rate of flame radiation increased. Similarly, for reason C, the temperature rises extremely quickly.

Cooking time has also been reduced by about 25 inches. This is due to the higher temperature and the better penetration of heat into the fish meat.
This is because infrared rays of ~2 μm increased.

Effects of the Invention As described above, the cooking device of the present invention has the following advantages: (1) Strong infrared rays are radiated onto the food, and the fire can be quickly and efficiently energized to the inside of the food.

■ Because the red-hot temperature is high, the oil is burned off in the radiator, so less smoke is generated.

1 ■ Excellent heat resistance and corrosion resistance, allowing for improved durability.

■ The coating on the radiator can be applied using the Knupp V-method, making it highly suitable for mass production, requiring no complicated pretreatment, and being inexpensive.
Economical.

It has many effects such as.

[Brief explanation of the drawing]

Figure 1 is an enlarged cross-section of the main part of the gas staple
FIG. 2 is a perspective view of the same. 1...Crill chamber, 2...Convener burner, 3...Ignition knob, 7...Radiator,
8...Cooked food, 1°...Burner. Name of agent: Patent attorney Toshio Nakao and 1 other person11
M1rIA Fig. 2 J/J,)

Claims (1)

[Claims] It consists of a burner and a radiant placed near the burner that is secondarily heated by the burner, and consists of an incubation chamber with an exhaust hole in the upper part, and the porosity of the part of the radiant that becomes red-hot in particular. is 15% to 60%, and the porosity of the radiator in the portion facing the exhaust hole is greater than or equal to the porosity of the red-hot portion, the radiator is A cooking appliance having a radiant body coated on a part or all of its surface with a coating material in which an infrared radiation material is dispersed in an organosilicon polymer mainly composed of a borosiloxane resin.