JPS6362663B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application High-frequency heating devices used in household cooking devices have the disadvantage that food does not brown because the food itself absorbs high-frequency power and generates heat on its own. They are also not very good at baking bread, pastries such as kutsky, and other oven dishes and are not suitable for them. In order to improve this problem, the present invention relates to a high-frequency heating device in which an electric heater is provided in a high-frequency heating chamber.

BACKGROUND ART FIG. 1 shows a conventional example of a high-frequency heating device equipped with an electric heater to achieve effective browning and oven cooking. As shown in the figure, the general configuration is such that an upper electric heater 2 is provided on the inner upper surface of a heating chamber 1 and a lower electric heater 3 is provided on the inner bottom surface, and a sheathed heater is used as the electric heater. The upper electric heater 2, which is a sheathed heater, is designed to have a complicated shape as shown in the figure so that the food placed in the heating chamber 1 is heated uniformly on a plane. Similarly, the lower electric heater 3 is also constituted by a sheathed heater, and has a shape designed to uniformly heat the oven tray on which the food is placed.

Problems to be Solved by the Invention However, when an electric heater is provided in the heating chamber 1, whether it is a sheathed heater or another infrared heater, the influence of thermal radiation cannot be avoided. Although the upper electric heater 2 has been devised to have a complicated shape for uniform heating, it has its limitations, and it is inevitable that the area immediately below the sheathed heater will be strongly scorched. The same can be said for the lower electric heater, and it is unavoidable that the surface of the oven tray directly above the sheathed heater will be strongly heated. There are drawbacks such as the influence of thermal radiation and the fact that it is impossible to uniformly heat the entire atmosphere within the heating chamber 1 with the lengths of the upper and lower electric heaters.

On the other hand, the high-frequency heating device used in household cooking equipment is
It is overwhelmingly used for high-frequency cooking using high-frequency power. In this case, the electric heater is not used, and it is a nuisance when taking food in and out, and the space in the heating chamber 1 is also narrowed. Also, the inside of the heating chamber 1 gets dirty during cooking. The electric heater also has the disadvantage that it is very inconvenient for cleaning the inside of the heating chamber 1.

In order to obtain uniform browning and effective oven cooking, it is desirable that the influence of heat radiation is small and the ambient temperature of the heating chamber is uniform throughout. Furthermore, it is desired that the high-frequency heating device has a smooth structure that is easy to clean and has no appendages in the heating chamber. Therefore, in order to achieve this, the present invention aims to provide a high-frequency heating device that allows effective oven cooking without installing an electric heater such as a sheathed heater in the heating chamber and that has a clean heating chamber. .

Means for Solving the Problems The present invention has a structure in which the inner surface of the heating chamber wall made of metal is coated with enamel, a sheet-shaped heater wire is provided on the inner surface of the heating chamber wall, and the inner surface of the heating chamber wall is further coated with enamel. That is.

Function By applying a enamel coating to the sheet-shaped heater wire integrally with the heating chamber wall surface, there are no protrusions inside the heating chamber, and even if the heating chamber has a simple configuration, heating can be performed using an electric heater, making it ideal for cooking in the oven and for browning. You will get the means.

Example An embodiment of the present invention will be described below with reference to the drawings.

In Fig. 2, numeral 4 is a heating chamber in which food is placed and subjected to high-frequency heating or electric heater heating, 5 is a magnetron that is a high-frequency oscillation source that supplies high-frequency power to the heating chamber 4, and 6 is a heating chamber in which high-frequency waves oscillated from the magnetron 5 are supplied to the heating chamber. This is a waveguide that transmits power to 4. In a high-frequency heating device constructed of such a device, one in which the four walls of the heating chamber are integrally formed with an electric surface heater as shown in the structure shown in FIG. 3, which is an enlarged sectional view of part A in FIG. This is an example.

The configuration will be explained below with reference to FIG. In FIG. 3, reference numeral 7 denotes an iron plate constituting the wall surface of the heating chamber 4, and a steel plate for enamel is used for coating with enamel, which will be described later. 8 is an enamel coated with an iron plate 7, and recently, a low melting point enamel has been developed and used. It is also possible to use a conventional general enamel coating. 9 is a sheet-shaped heater wire that is insulated with enamel 8 and bonded to the iron plate 7 that is the wall of the heating chamber 4, as shown in FIG. 3b.
Resistance wires are used by punching out stainless steel plates with a diameter of 0.1 mm or less and forming them into wires. The sheet-like heater wire 9 is bonded to the side of the iron plate 7 that forms the inner surface of the heating chamber 4 . The structure of the wall surface of the heating chamber 4 shown in FIG. The heating chamber 4 is coated with an enamel coating, and the iron plate 7 is coated with an insulating coating against the human body from inside the heating chamber 4. Reference numeral 10 in FIGS. 2 and 3 is an aluminum foil provided on the outer surface of the heating chamber 4 to prevent heat radiation to the outside. The sheet-like heater wire 9 is provided over the entire surface of the heating chamber 4.

With the above configuration, during high-frequency heating, the high-frequency waves are confined inside the heating chamber 4 having an enameled iron plate structure, and the high-frequency power supply from the magnetron 5 performs high-frequency heating. Sheet-shaped heater wire 9
When the heating chamber 4 is energized, the inner surface of the heating chamber 4 becomes a planar heating element, and uniform heat generation is obtained over the entire surface. As a result, the influence of radiation is small, and the inside of the heating chamber 4 maintains a soft and uniform temperature. The sheet-like heater wire 9 is located on the inner surface of the heating chamber 4 to increase the internal temperature, and the aluminum foil prevents heat radiation to the outside, thereby providing a highly efficient heating system.

Note that although the explanation has been made with a configuration in which the sheet-shaped heater wire 9 is bonded to the inner surface of the heating chamber 4, the same effect can be obtained even if the sheet-shaped heater wire 9 is bonded to the outer surface of the heating chamber 4 wall because the heat conduction of the iron plate 7 is good. .

Effects of the Invention The high-frequency heating device of the present invention configured as described above has no protrusions such as a sheathed heater inside the heating chamber, has the same structure as a simple high-frequency heating device, can perform heating with an electric heater, and has the same structure as a simple high-frequency heating device. You can get cooking and browning tools. Therefore, it is easy to clean.
In addition, since the entire surface is heated by a surface heating element rather than a centralized heater, the inside of the heating chamber is heated to a uniform atmospheric temperature and good results can be obtained. There is no effect of radiation from electric heaters, and defects such as severe burns on some parts of the surface are eliminated.

Since the heater is integrally formed on the wall surface of the heating chamber with a hollow insulating coating, the heat insulating layer is thin and the wall surface itself acts as a surface heater, resulting in high thermal efficiency.

Furthermore, since it is coated with enamel insulation, it is safe from electric shock. In particular, there is no path for the human body to come into direct contact with the heater surface from inside the heating chamber, making it extremely safe.

[Brief explanation of drawings]

Figure 1 is a perspective view of the main parts of a conventional high-frequency heating device.
Fig. 2 is a vertical cross-sectional view of the main part of a high-frequency heating device according to an embodiment of the present invention, Fig. 3a is an enlarged view of the main part of the heating chamber wall, and Fig. 3b is a main part of the sheet-like heater wire. It is an external perspective view. 1...Heating chamber, 2...Upper electric heater, 9...Sheet-shaped heater wire.

Claims (1)

[Claims] 1 A metal comprising a heating chamber to which high frequency power is supplied and a magnetron which is a high frequency oscillation source which supplies high frequency power to the heating chamber, and the entire surface of the heating chamber is coated with wire-free enamel in which a sheet-shaped heater wire is embedded. A high-frequency heating device made of a plate.