JPH11118158A - Heating cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent heat from being radiated outside, obtain uniform temperature distribution in the heating chamber and heat a heating object uniformly by constituting four internal wall faces of a heating chamber of ceramic. SOLUTION: An oven range 1 as a heating cooker has a control panel 3 on an exterior member 2 thereof and a heater 5 and a rotary plate 6 are disposed within a heating chamber 4 opened in a front face of the exterior member 2 and top, bottom, left and right inner wall faces are lined with ceramic plates 7. Crystallized glass or the like is used for the ceramic plates 7. Various ceramics made by sintering alumina and the like can be used and porous ceramics are preferred for thermal insulation. Inside faces of the heating chamber is constituted of ceramics and have a lower thermal conductivity than metals so that less heat is emitted outside. Because the ceramic has a larger heat capacity, infrared rays are radiated in the heating chamber when the ceramic is heated so that an interior of the heating chamber is uniformized and a heating object is heated as if the object is enveloped wholly.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooking device such as an electric oven or a microwave oven.

[0002]

2. Description of the Related Art A conventional heating cooker has a box-shaped metal exterior body on the outside, and a metal heating chamber is formed inside the exterior body. For ease of use, heat-resistant paint and fluorine coating are applied.

[0003]

However, in such a cooking device, a metal is used in the heating chamber, so that the heat conduction is good and the temperature distribution in the heating chamber tends to be uniform. Heat dissipation to the heat is large, and energy loss is likely to occur. Moreover, the temperature of the exterior body increases due to heat radiation from the heating chamber, which is dangerous.

Japanese Utility Model Application Laid-Open No. 5-79305 discloses that an air-insulating layer is formed by providing a heat-insulating molded body between an exterior body and a heating chamber. Can be suppressed, but the temperature distribution in the heating chamber tends to be non-uniform, and heating cannot be performed so as to enclose the object to be heated.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and it is possible to prevent heat radiation from the heating chamber to the outside, to make the temperature distribution in the heating chamber uniform, and to uniformly heat the object to be heated. It is an object of the present invention to provide a heating cooker that can perform cooking.

[0006]

According to the present invention, at least four surfaces of the inner wall of the heating chamber are made of ceramic.

In the present invention, the outermost part of the heating chamber is made of a metal plate, and a heat insulating wall made of a ceramic plate is formed inside the heating plate, and the heat insulating wall is fixed to the metal plate with a holding metal from the inside. It is preferable that a part of the holding metal is exposed in the heating chamber.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a microwave oven 1 as a heating cooker according to the present invention, in which a control panel 3 is formed on the front surface of an exterior body 2,
A heater 5 and a rotating plate 6 are provided in a heating chamber 4 opened on the front surface of the exterior body 2, and a ceramic plate 7 is adhered to inner wall surfaces on the upper, lower, left and right sides.

As the ceramic plate 7, crystallized glass or the like can be used. In addition, various ceramics obtained by sintering alumina or the like can be used, and a porous material is preferable for heat insulation.

FIG. 2 shows a structure for attaching a ceramic plate 7 to the heating chamber 4. A frame 8 made of a metal plate is provided at the outermost part of the heating chamber 4, and is attached to the inside of the exterior body 2. I have. A heat insulating wall 9 formed by combining a ceramic plate 7 is fitted inside the frame 8, and the heat insulating wall 9 is fixed to the frame 8 from the inside by a holding metal 10.
A part of the holding metal fitting 10 is exposed in the heating chamber 4.

[0011]

According to the present invention, the inner surface of the heating chamber is made of ceramic, and the thermal conductivity of ceramic is smaller than that of metal. And the temperature of the exterior body does not become excessively high, which is safe. Further, since it is not necessary to separately install a heat insulating material, the structure is simple and the manufacturing process is also simple.

Also, since ceramic has a large heat capacity,
When heated, infrared rays are radiated into the heating chamber, so that the temperature distribution in the heating chamber is made uniform and heating can be performed so as to enclose the object to be heated entirely.

Further, by exposing a part of the holding member to the heating chamber as in claim 2, the heating chamber can be heated more uniformly by the emission of infrared rays from the ceramic and the reflection by the holding member. .

[0014]

As described above, according to the present invention, since the heat insulating property of the ceramic causes little energy loss and the exterior body does not become excessively hot, it does not cause injury such as burns and is safe.

Further, since the ceramics accumulate heat and radiate infrared rays, uniform heating and cooking can be performed so as to enclose the object to be heated in the heating chamber.

[0016]

EXAMPLE A crystallized glass plate as a ceramic (plate thickness 4 m)
The state at the time of heating was measured with and without setting m).

1. Inside and outside surface temperature The inside of the microwave oven was set at 250 ° C. and heated, and when the equilibrium state was reached, the inner surface temperature of the heating chamber and the outer surface temperature of the outer package were measured at the upper, lower and side portions of the microwave oven. .

2. Power consumption The temperature inside the oven was set to 250 ° C and 180 ° C, heating was performed, and the power consumption when the temperature was adjusted for 1 hour was measured.

3. Rise of Temperature When the microwave oven was set at 250 ° C. and 180 ° C. and heating was started from room temperature, the time required for the internal temperature to reach the set temperature was measured.

Table 1 shows the measurement results.

[0021]

[Table 1]

As is clear from Table 1, according to the present invention, as compared with the case where no ceramic is provided, in the heating equilibrium state, the outer surface temperature is lower despite the inner surface temperature of the heating chamber being higher, and the heat insulating property is lower. It can be seen that it has. Also, the power consumption of the present invention is smaller, and there is an energy saving effect.

However, since the heat capacity of the ceramic is large, the time required for the temperature to rise is slightly longer, but the degree is small and is sufficiently compensated for by the reduction in power consumption in the heating state.

[Brief description of the drawings]

FIG. 1 is a front view of a microwave oven as an example of the present invention.

FIG. 2 is an exploded perspective view of a heating chamber of the microwave oven of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Microwave oven 4 Heating room 7 Ceramic plate 9 Insulation wall 10 Holding metal

Claims (2)

[Claims] 1. A cooking device characterized in that at least four surfaces of the inner wall of the heating chamber (4) are made of ceramic (7). 2. An outermost portion of the heating chamber (4) is made of a metal plate, and a heat insulating wall (9) formed of a ceramic (7) plate is formed inside the heating chamber (4). The cooking device according to claim 1, characterized in that the metal holding plate (10) is fixed to the metal plate from the inside, and a part of the metal holding member (10) is exposed in the heating chamber (4).