JP4969309B2 - Cooker - Google Patents

Description

  The present invention relates to a cooking device such as a microwave oven or an electric oven.

  In a conventional cooking device, a heater and a rotating dish are provided in a heating chamber, and heat insulating walls formed by combining ceramic plates are attached to upper, lower, left and right inner wall surfaces. The heat insulating wall is fitted inside a metal frame provided at the outermost part of the heating chamber and is fixed by a pressing metal fitting (for example, see Patent Document 1).

Japanese Patent Laid-Open No. 11-118158

  However, in the above-mentioned conventional cooking device, the structure is complicated because the heat insulating wall of the ceramic plate is fixed with the holding metal, and the holding metal is closely exposed in the heat insulating wall (ceramic plate). Since the heat insulating wall is in close contact with the metal frame, it cannot be said that the heat insulating effect is good.

  In addition, when the heater is provided on a plurality of surfaces using the heating cooker, for example, since the ceramic plate exists on the surface having the heater, the radiant heat from the heater is easily absorbed by the ceramic plate. The temperature rise in the room was not good. When a magnetron is used, if a ceramic plate is present on the surface having the magnetron, the microwave is absorbed by the ceramic plate, and the heating efficiency by the microwave is not good.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a cooking device having a simple structure, a high heat insulating effect, and a far-red effect.

A cooking device according to the present invention includes a cooking device body, a heating chamber provided in the cooking device body for storing and cooking food, heating means for heating the cooking material, and an inner wall of the heating chamber. The ceramic plate is provided with a gap formed on at least two surfaces, and the unevenness provided on the surface exposed to the heating chamber of the ceramic plate, and the surface of the ceramic plate is smoothly finished by coating.

In the present invention, since the unevenness is provided on the surface of the ceramic plate exposed in the heating chamber, the surface area of the ceramic plate increases, and thus the amount of radiation of far infrared rays increases . Further, since the surface of the ceramic plate is smoothed by the coating, dirt and the like attached to the ceramic plate can be easily wiped off, and the cleanability in the heating chamber is improved.

Embodiment 1 FIG.
1 is a front sectional view showing a microwave oven of a heating cooker according to Embodiment 1 of the present invention, FIG. 2 is a sectional view showing the shape of a ceramic plate provided in a heating chamber of the microwave oven, and FIG. 3 is a ceramic. It is an expanded sectional view of a board.
In FIG. 1, a heating chamber 2 having an open front surface is provided inside a microwave oven body 1. The heating chamber 2 is divided into a frame 3 whose top surface, back surface, bottom surface, and left and right side surfaces are formed of stainless steel plates, and a door (not shown) that covers the front opening of the frame 3 so as to be openable and closable. Is formed. The left and right side surfaces of the frame 3 are formed with depressions 4 that are recessed in two stages by press molding, and ceramic plates 5 are fixed to the respective depressions 4. A heater 9 that heats the food is installed outside the bottom surface of the heating chamber 2, and a magnetron that supplies microwaves into the heating chamber 2 is provided, although not shown.

The ceramic plate 5 described above has, for example, a thickness of 4 mm and a planar shape of a rectangle or a square, and a shelf 7 for supporting a metal or ceramic cooking dish 8 is formed. The ceramic plate 5 is made of mullite or cordierite ceramic as a material and mainly contains silicon oxide (SiO ₂ ), aluminum oxide (Al ₂ O ₃ ), magnesium oxide (MgO), zirconium oxide (ZrO ₂ ), etc. It is configured. Instead of these materials, pottery, natural stone, crystallized glass, etc. may be used.

  The ceramic plate 5 has an outer peripheral edge portion attached to the left and right side surfaces of the frame body 3 so that the ceramic plate 5 is fitted in the first step portion of the recess 4 formed on the left and right side surfaces of the frame body 3. For example, it is fixed with a silicon adhesive. By installing this ceramic plate 5, a gap portion 6 is formed between the inner side surface, which is the second step portion of the recess 4, with an air layer interposed. The size of the gap 6 is 2 to 6 mm or less in order to obtain a heat insulating layer. If the size of the gap 6 is large, a natural convection in the vertical direction in the sealed air layer occurs due to a temperature difference between the back surface of the ceramic plate 5 and the inner side surface of the recess 4 formed in the frame 3, and heat transfer. It does not become thermal insulation. In general, if it exceeds 6 mm, heat convection occurs, and if the size of the gap 6 is small, heat conduction occurs and heat insulation does not occur.

  Therefore, the gap 6 is set to 2 to 6 mm or less as described above, and the surface exposed to the heating chamber of the ceramic plate 5 (including the shelf 7) as shown in FIGS. 2 and 3 is about 0.5 mm. The unevenness 11 is provided. Due to the unevenness 11, the area of the ceramic plate 5 that comes into contact with the air is larger than that of the ceramic plate whose surface is processed smoothly. Since the amount of far-infrared radiation is proportional to the area, the amount of far-infrared radiation radiated from the ceramic plate 5 can be increased, resulting in a greater far-red effect, and since the surface area is large, the heat insulation effect is also increased.

According to the first embodiment, the double heat insulating effect of the ceramic plate 5 on which the minute irregularities 11 are formed and the heat insulating layer of the gap 6 reduces energy loss and saves energy. Can be installed in a state where the main body 1 is in contact with the wall, and burn injury can be prevented. Furthermore, since the ambient temperature of the electrical components provided in the vicinity of the outside of the heating chamber 2 is lowered, deterioration of the electrical components due to high temperatures can be prevented, and the lifetime of the microwave oven body 1 can be extended. Further, the heat insulating layer of the gap 6 makes it difficult to cool the heat stored in the ceramic plate 5, and the oven temperature of the heating chamber 2 can be kept high.
Further, since the surface area is increased by the irregularities 11 formed on the surface of the ceramic plate 5, the amount of far infrared rays emitted from the ceramic plate 5 due to the heating of the heater 9 increases, and the heat insulating layer of the gap 6 Since heat radiation to the outside is suppressed, the food in the heating chamber 2 can be cooked uniformly in a state of wrapping the cooked food.

Embodiment 2. FIG.
Next, Embodiment 2 of the present invention will be described with reference to FIG. FIG. 4 is an enlarged cross-sectional view of a ceramic plate provided in the heating chamber of the microwave oven according to the second embodiment. The microwave oven of the present embodiment is the same as that of the first embodiment described with reference to FIG. 1 except for the structure of the ceramic plate.
The ceramic plate 5 in the heating chamber 2 according to the second embodiment has an outer peripheral edge portion of the frame body so that the ceramic plate 5 is fitted in the first step of the recess 4 formed on the left and right side surfaces of the frame body 3. 3 is fixed to the left and right side surfaces of the concave portion 3 with an adhesive 10, and a gap portion 6 is formed with the inner side surface which is the second stepped portion of the recess 4. On the surface (including the shelf 7) exposed in the heating chamber of the ceramic plate 5, minute irregularities 11 of about 0.5 mm are formed, and on the surface excluding the shelf 7, a coating 12 having far-infrared transmittance. Has been applied to create a smooth finish. The coating 12 is mainly made of a glaze such as Lithia, antibacterial paint, and a highly hydrophilic antifouling paint.

  Since the minute irregularities 11 are formed on the surface of the ceramic plate 5 exposed in the heating chamber, the surface area increases and the far-infrared radiation amount increases. Moreover, since the surface is coated 12 and finished smoothly, it becomes easy to wipe off dirt and the like adhering to the ceramic plate 5, and the cleanability in the heating chamber 2 is improved.

Embodiment 3 FIG.
Next, Embodiment 3 of the present invention will be described with reference to FIG. FIG. 5 is an enlarged cross-sectional view of a ceramic plate provided in the heating chamber of the microwave oven according to the third embodiment. The microwave oven of the present embodiment is the same as that of the first embodiment described with reference to FIG. 1 except for the structure of the ceramic plate.
As described above, the ceramic plate 5 in the heating chamber 2 in the third embodiment is fixed to the first step of the recess 4 formed on the left and right side surfaces of the frame 3, and the second step of the recess 4. A gap portion 6 is formed by the inner side surface serving as a stepped portion. On the surface of the ceramic plate 5 exposed in the heating chamber, minute irregularities 11 of about 0.5 mm are formed. Further, the shelf 7 formed on the ceramic plate 5 is coated with a coating 12 on the surface and finished smooth.

  In the third embodiment, the inner surface of the ceramic plate 5 and the recessed portion 4 that is the second stepped portion is formed by the minute unevenness 11 of about 0.5 mm formed on the surface exposed to the heating chamber of the ceramic plate 5. In addition to the effect of increasing the amount of far-infrared radiation and maintaining the temperature in the heating chamber 2 at a high temperature by the gap 6 formed with the side surfaces, the coating 12 applied to the surface of the shelf 12 allows the cooking dish to be taken in and out. There is an effect that sometimes the shelf 7 and the cooking pan 8 are not damaged.

Embodiment 4 FIG.
Next, Embodiment 4 of the present invention will be described with reference to FIG. FIG. 6 is a front sectional view showing the microwave oven of the heating cooker according to the fourth embodiment. In addition, the same code | symbol is attached | subjected to the same or equivalent part as Embodiment 1 demonstrated in FIG. 1, and description is abbreviate | omitted.
In the microwave oven according to the fourth embodiment, the ceramic plate 5 is installed on the bottom surface and the left and right side surfaces in the heating chamber 2, and the heater 9 is installed outside the bottom surface of the heating chamber 2. The ceramic plate 5 installed on the bottom surface in the heating chamber 2 is made of a material such as crystallized glass that is resistant to impact and the like because a container or the like is placed thereon, and its thickness is about 3 mm. The thickness of the ceramic plate 5 installed on the left and right side surfaces is about 4 mm, which is thicker than the ceramic plate 5 on the bottom side.

  Since the ceramic plates 5 on the left and right side surfaces are formed thicker than the ceramic plate 5 on the bottom surface side where the heater 9 is installed, the heat insulating effect on the left and right side surfaces is higher than that on the bottom surface side. Since there is no heat source such as the heater 9 on the left and right side surfaces, the temperature rise is slower and the temperature drop is faster than the bottom surface side where the heater 9 is present, but the heat insulating effect is achieved by making the ceramic plates 5 on the left and right side surfaces thicker. However, the temperature difference from the other surfaces becomes smaller, the temperature distribution in the heating chamber 2 becomes uniform, and a good cooking state can be realized.

  Further, since the ceramic plate 5 on the bottom surface side having the heater 9 is formed thin, absorption of radiant heat from the heater 9 by the ceramic plate 5 is small, and the temperature rise in the heating chamber 2 is not greatly deteriorated.

  As described above, according to the fourth embodiment, since the ceramic plates 5 on the left and right side surfaces of the heating chamber 2 are configured to be thicker than the ceramic plate 5 on the bottom surface side where the heater 9 is installed, the heat loss on the bottom surface side is small. The heat insulating effect on the left and right side surfaces is increased, the temperature distribution in the heating chamber 2 is uniform, and a good cooking state can be realized.

Embodiment 5 FIG.
Next, Embodiment 5 of the present invention will be described with reference to FIG. FIG. 7 is a front sectional view showing the microwave oven of the heating cooker according to the fifth embodiment. In addition, the same code | symbol is attached | subjected to the same or equivalent part as Embodiment 1 demonstrated in FIG. 1, and description is abbreviate | omitted.
In the microwave oven according to the fifth embodiment, a magnetron 13 that generates a microwave, a waveguide 13 a that guides the microwave into the heating chamber 2, and a heater 9 are provided outside the bottom surface of the heating chamber 2. . The ceramic plate 5 installed on the bottom surface in the heating chamber 2 is made of a material such as crystallized glass having high microwave permeability. Since the ceramic plate 5 has a small amount of absorbing microwaves and does not greatly deteriorate the heating efficiency during heating, it can also be used as a microwave feeding port.

  Since the ceramic plate 5 installed on the left and right side surfaces of the heating chamber 2 is made of a material having a high far-red emissivity as described above, the ceramic plates 5 on the left and right side surfaces are heated when heated by the heater 9. Due to the far-red effect, the cooked food can be cooked uniformly without unevenness.

  As described above, according to the fifth embodiment, a material having high microwave permeability is used for the ceramic plate 5 on the bottom surface side which is a microwave feeding port, and far infrared radiation is applied to the other ceramic plates 5 on the left and right side surfaces. Since a high material is used, the cooked food can be cooked uniformly and uniformly by the far-red effect of the ceramic plate 5 at the time of heater heating without greatly deteriorating the heating efficiency of microwave heating.

It is front sectional drawing which shows the microwave oven of the heating cooker which concerns on Embodiment 1 of this invention. It is sectional drawing which shows the shape of the ceramic board provided in the heating chamber of the microwave oven. It is an expanded sectional view of a ceramic board. 6 is an enlarged cross-sectional view of a ceramic plate provided in a heating chamber of a microwave oven according to Embodiment 2. FIG. 6 is an enlarged cross-sectional view of a ceramic plate provided in a heating chamber of a microwave oven according to Embodiment 3. FIG. It is sectional drawing of the front which shows the microwave oven of the heating cooker which concerns on Embodiment 4. FIG. It is sectional drawing of the front which shows the microwave oven of a heating cooker based on Embodiment 5. FIG.

Explanation of symbols

1 Microwave Oven Body, 2 Heating Chamber, 3 Frame, 4 Concave, 5 Ceramic Plate,
6 gaps, 7 shelves, 8 cooking dishes, 9 heaters, 10 adhesives, 11 irregularities, 12 coatings, 13 magnetrons, 13a waveguides.

Claims (2)

The cooker body,
A heating chamber provided in the cooker body for storing cooked food and cooking;
Heating means for heating the cooked food,
A ceramic plate provided with a gap formed on at least two surfaces of the inner wall of the heating chamber;
Provided with unevenness provided on the surface exposed to the heating chamber of the ceramic plate ,
A heating cooker characterized in that the surface of the ceramic plate is smoothly finished by coating . The cooker body,
A heating chamber provided in the cooker body for storing cooked food and cooking;
Heating means for heating the cooked food,
A ceramic plate provided with a gap formed on at least two surfaces of the inner wall of the heating chamber;
Provided with unevenness provided on the surface exposed to the heating chamber of the ceramic plate,
The surface exposed to the heating chamber of the ceramic plate, the ledge for cooking dish supporting the unevenness is provided is formed, only the surface of the ledge you characterized by being smoothly finished by coating pressurized heat cooker.

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