JP2506781B2 - Pottery - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a pottery for grilling fish, meat, vegetables, etc. on a gas table stove, and more specifically, the gas combustion heat of the gas stove is converted into convective heat and radiant heat. Exchange, cook quickly,
It is about fluffy pottery.

2. Description of the Related Art A pottery having a bottom made of a metal plate, having a large number of small holes in the metal plate, and having an asbestos mesh formed by adhering asbestos to the metal mesh on the top thereof is commercially available. The porcelain furnace heats the metal bottom with a gas stove flame to generate radiant heat, while some combustion gas rises through holes in the bottom metal to heat the asbestos mesh at the top. The heated asbestos mesh generates radiant heat, and this radiant heat cooks the food.

Problems to be Solved by the Invention In the conventional pottery furnace, the combustion heat of the gas stove first heats the bottom plate metal of the pottery, and the asbestos mesh is heated by the radiant heat from the bottom plate metal and a part of the combustion gas passing through the holes. However, it is an indirect heating in which the food is cooked with radiant heat from the heated asbestos mesh. Therefore, the thermal efficiency is low.

As for the bottom plate metal, the high temperature of Yonro flame directly contacts the asbestos,
The asbestos has a flameproof effect to prevent the food from burning due to high temperatures. This effect is best with a perfect plate, but there is a contradiction that the aperture area must be increased in order to transfer the hot airflow to the asbestos mesh above. The current asbestos mesh pottery has a small open area of less than 20% in order to prevent burning due to flames, so combustion gas flows outward along the metal bottom plate and is rarely used for cooking. .

Further, most of the oil, juice, sauce, soy sauce, and food powder that fall from the cooked material is on the asbestos mesh, and partly passes through the asbestos mesh and reaches the metal bottom plate. These materials carbonize due to heat on the asbestos mesh and on the metal bottom plate. As a result, the asbestos mesh is black and dirty, leaving stains. Also, when cooking next time,
The incomplete charcoal of the previous cooking gives off an odor and spoils the flavor of the cooking.

The sauce and soy sauce that fall from the food adhere to the metal bottom plate,
Furthermore, it is exposed to high-temperature gas flames, is prone to oxidation and high temperature corrosion, and has a short life. Further, the asbestos mesh has a reinforcing metal mesh inside. However, the thermal expansion coefficient of metal and that of asbestos are different, and there are drawbacks such as the asbestos falling off from the metal mesh due to thermal cycles, and the effect of asbestos disappears.

Means for Solving the Problems In order to solve the above problems, in the present invention, instead of the conventional metal bottom plate having a flame shielding effect and the asbestos mesh having a heat radiation effect, a ceramic having a large porosity and a large thickness is used. By using a plate, it is possible to provide a porcelain ware having excellent thermal efficiency, self-cleaning dirt, and long life without corrosion.

Action Since the porcelain pottery of the present invention has a combination of a ceramic plate having a large opening ratio and a small ventilation resistance and a tubular body, most of the combustion gas of the gas stove is introduced into the porcelain pottery to improve heat utilization. Can be planned. In addition, the burning of cooked food due to flames and high-temperature combustion gas reduces the combustion gas temperature and equalizes the temperature of the ceramic plate due to the increase in heat exchange due to the large surface area and thickness of the ceramic plate, which results in uniform heating of the cooked product. It helps prevent local burning of cooked food. Further, a large amount of radiant heat is radiated from the large surface area of the ceramic plate, and the radiant heat and the convective heat of the combustion gas described above cause the cooked food to be boiled plumply and deliciously as if it were burned by a charcoal fire. Further, the ceramic plate has a long life without corrosion due to adhesion of soy sauce, oil, salt solution, etc., and without fear of high temperature oxidation due to flame.

If ceramics are made to contain a catalyst such as platinum by impregnation or the like, dirt such as oil falling from the food is oxidatively purified by the oxidizing action of the catalyst during cooking. The reaction formula is Indicated by. That is, in the conventional example, the oil, starch, and protein falling from the food are carbonized on the ceramic plate to become dirt. In the present invention, the carbonized dirt is gradually oxidized to carbon dioxide by the action of the catalyst. . Therefore, the ceramic plate has a self-cleaning action that does not stain. However, even a large amount of fallen objects and dirt that has fallen before the completion of cooking may not be able to be purified by oxidation, no matter how catalytically active ceramics. However, in such a case, after cooking, if the soiled surface is faced down and heated with a stove, the oxidative purification can be carried out in a short time. Further, by disposing the ceramics plate at a position 10 mm or more from the bottom (Gotoku) of the body of the pottery, it is possible to improve the uniform heating property of the ceramics plate and to reduce the heat effect on the body of the gas stove.

As described above, the utilization efficiency of combustion convection heat is increased by using a ceramic plate with a high porosity for the heat radiator of the pottery, and due to the large surface area, the convection heat is converted into radiant heat and added. As a result, the flame shielding effect and the uniform heating property can be brought about, and the effect of uniformly heating the cooked food by convective heat and radiant heat can be obtained. In addition, by providing the ceramic plate with a catalytic function, the ceramic plate has a self-cleaning effect against stains caused by falling objects from the cooked product, which reduces cleaning time.

Examples The figures show a wareware according to the invention. 1 is mulberry material,
It is a cylindrical body made of heat-resistant clay or metal, and has an outer dimension of 200 mm in diameter and a height of 60 mm, the accommodating part of the heat radiation ceramics plate 2 has a diameter of 160 mm, and the lower heat air intake port has a diameter of 140 mm. In this embodiment, 1 and the heat radiating ceramics plate 2 are separated from each other, but this is for conducting various comparative tests. For mullite material, cordierite material, heat-resistant clay, etc., the heat radiating ceramics board is referred to as the main body 1. An integrally molded body is also possible by using the same material.

Reference numeral 2 is a heat radiation honeycomb ceramics plate, but in this embodiment, it was made by trial using lime aluminate and heat resistant clay. As for lime aluminate type, silicon oxide and titanium oxide are added as additives, various thickening agents are added, and the cross-sectional area of a square hole is 0.25 mm ²
(0.5 mm × 0.5 mm) to 25 mm ² (5 mm × 5 mm) with a porosity of 80% were prototyped. The open area was adjusted by filling the holes of the highest open area with the same material.

The heat radiation body is molded by kneading each material powder and water, and performing extrusion molding or cast molding. In this embodiment,
It was molded by an extrusion molding method, air-dried, and then heated and baked at 500 ° C and 1000 ° C. The molded product has a diameter of 160 mm and a thickness of 3 to 25 mm. Furthermore, a platinum catalyst was supported on the molded body.
As the supporting method, the molded body was immersed in an aqueous solution of chloroplatinic acid to impregnate and carry chloroplatinic acid. The amount of supported chloroplatinic acid is 1
The amount per sheet was 0.1 g. Samples impregnated with chloroplatinic acid
It was heated at 600 ° C for 2 hours to have a catalytic function.

3 is a grill, 4 is a gas stove main body, 5 is Gotoku on the gas stove, 6 is a burner of the gas stove, and 7 is an object to be cooked.

Example 1 A heating test of the pottery of this example was performed on a commercially available gas stove. At this time, all the hot air of the stove burner 6 enters the inside of the main body 1 of this embodiment. If not all flow in, it will flow out along the outer surface of the body. Therefore, if the temperature on the lateral side is measured, the utilization efficiency of the hot air of the gas burner can be known.

Regarding the cross-sectional area of the holes in the ceramic plate, at 0.25 mm ² (0.5 mm × 0.5 mm) and 0.5 mm ² (0.7 mm × 0.7 mm), the temperature on the outer side 20 mm of the pottery body exceeded 300 ° C and the burner It was found that the hot air was not fully utilized. On the other hand, it was found that most of the burner heat was used below 300 ° C above 1 mm ² .

Regarding the porosity of the ceramic plate, zero (no hole), 10%, 20%, the temperature of the outer area of the body exceeds 300 ℃, and it can be seen that hot air is leaking. From the above, the cross-sectional area of the hole must be 1 mm ² or more, and if it is 25 mm ² or more, the flame blocking effect of the flame of the gas stove is lost, which is not preferable. A porosity of 30% or more is required.

Next, the installation height of the ceramic board (corresponding to h in the figure)
The heating test was performed by changing the temperature. As a result, at 0 mm and 5 mm, the temperature on the lateral side of the body exceeded 300 ° C, indicating that the combustion gas was leaking. In order to fully utilize the combustion gas, it must be at least 10 mm away from Gotoku.

Also, as a result of performing the same test by changing the thickness of the ceramic plate, a flame is not seen at a thickness of 2 mm, and a flame can be seen above the ceramic plate. A ceramic plate having a thickness of at least 5 mm must be used in order to exhibit a flame shielding effect and have uniform heating property.

Example 2 A heating test was performed using a ceramic plate a to which a platinum catalyst was attached and a ceramic plate b to which platinum was not attached. The surface temperature of both a and b was 400-450 ℃. Salad oil was placed in a syringe and dropped on samples a and b.
Part of the dropped oil turns into smoke and part turns black. When the heating was continued as it was, almost no trace was observed after 20 minutes in the case of a. However, in b, a trace was observed after 60 minutes. Separately, the carbonized samples were replaced with each other, and heating was continued. After about 10 minutes, almost no trace was observed after a, but after 30 minutes after b, a trace was observed.

In this way, the ceramic plate has a catalytic function, so that the stain is small, and even if the stain is dirty, the stain can be burned out by baking after cooking.

EFFECTS OF THE INVENTION Since a porous ceramic plate is used for the heat radiator according to the present invention, most of the combustion energy of the gas stove is given to the cooked food by convective heat and radiant heat, and thermal efficiency can be improved. Further, by imparting a catalytic function to the ceramic plate, a self-cleaning action can be exhibited. In addition, it is resistant to heat, acid, alkali, etc. and has a long life.

[Brief description of drawings]

The drawing is a vertical cross-sectional view showing a state in which a pottery according to the present invention is placed on a gas stove. 1 ... ware body, 2 ... ceramics plate, 3 ... grill, 4 ... stove body, 5 ... Gotoku, 6 ... stove burner, 7 ... cooked food.

Front page continued (72) Inventor Koichiro Seyama 1006 Kadoma, Kadoma-shi, Matsushita Electric Industrial Co., Ltd. (72) Inventor Meiji Katsura, 1006 Kadoma, Kadoma, Matsushita Electric Industrial Co., Ltd.

Claims (2)

(57) [Claims] 1. A large number of small holes having a porosity of 30 are formed in a hot air flow path of a cylindrical porcelain pot having a hot air intake port at the bottom and an exhaust hole at the top so as to intersect with the hot air passage direction. %, And a plate-like ceramic having a thickness of at least 5 mm and having a heat exchange function and a heat radiation function is installed. 2. The pottery ware according to claim 1, wherein the plate-shaped ceramic has an oxidation catalyst.