JPS62287587A - Electric heating unit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention Field of Industrial Application The present invention relates to an electric heating unit used mainly for cooking in ordinary households.

Conventional technology Conventionally, electric heating units for cooking used in general households have been made into units by winding electric stoves and sheathed heaters with spirally wound heating wires on ceramics. There is an electric range.

In addition to these, in Europe and the United States, there is a method called smooth top, in which a spirally wound heating wire is placed in a groove in the insulation material, a ceramic glass plate is placed on top of this, and this ceramic glass plate is used as the heating surface. Electric heating units are widely used.

However, in Japan, electric stoves made of ceramic are still in strong demand because they are inexpensive and have superior thermal efficiency compared to electric heating units such as smooth tops.

However, electric stoves that use traditional ceramics are dangerous because their heating wires are directly exposed to the outside, and the contents of the food being cooked can boil over, significantly shortening the lifespan of the heating wires. There were various problems. Furthermore, since ceramics have a large heat capacity, they are heavy and difficult to cool down, making them difficult to use, such as being able to be moved or stored immediately after use.

For this reason, various improvements are being made, especially in terms of the disconnection life of heating wires, such as providing a surface protective layer made of an inorganic fiber sheet-like material and a vitrified coating on the surface layer of heating wires (Jikkosho). 56-2378).

Problems to be Solved by the Invention However, in the above method, the vitrified film is destroyed during use, and the contents of the food to be cooked enter through this destroyed portion, and these are difficult to remove by evaporation, etc. This is not a very good method as it may have a more adverse effect than not doing so.

Furthermore, in terms of usability, which will be described later, the reality is that there has been little improvement.

For these reasons, there has been a desire for an electric heating unit that is not only easy to use but also stable in terms of quality.

The present invention solves the above-mentioned problems, and aims to provide an electric heating unit that is inexpensive, easy to use, and has excellent quality.

Means for Solving the Problems In order to solve the above problems, the present invention includes a top plate made of a metal plate, a spirally wound heating wire, and a groove in which the heating wire is arranged in a meandering manner. It has a heat insulating base mainly composed of silica fibers and alumina fibers, and a storage case made of a metal plate that houses this heat insulating base, with a radiation layer on the side of the object to be heated of the top plate, and a radiation layer on the side of the heating wire. Insulating layers are formed respectively, and a slight gap is provided between the top plate and a heat insulating base on which heating wires are arranged, so that these are integrated.

Function In the present invention, since the top plate is used, it is possible to prevent the heating wires from being exposed to the outside, and as a result, it is possible to eliminate the danger, and also to prevent the heating wires from being exposed to the outside due to the contents of the food being cooked. The decrease in disconnection life can be significantly suppressed.

However, in general, when a top plate or the like is placed on top of the heating wires, the heat transfer from the heating wires is blocked by the top plate and can be considered to be significantly reduced. Significant improvements can be made by using a metal plate such as a high-quality iron plate and by coating it with a material with excellent radiation properties to form a radiation layer to increase heat radiation from the top plate to the heated object. can.

In addition, since a metal plate is used as the top plate, it is necessary to ensure electrical insulation for the heating wires. This was made possible by creating a slight gap between the top plate and the heat insulating base on which the heating wires were placed.

Furthermore, by using a heat insulating base mainly composed of silica or alumina fibers instead of the ceramic used in conventional electric stoves, it is extremely lightweight, making it easier to carry. It has a smaller heat capacity and cools down quickly even after use, so it can be moved or stored quickly, making it much more convenient to use than conventional electric stoves.

In addition, by using a heat insulating board instead of conventional ceramics, heat would be transferred to the metal case housing the ceramics, which would reduce thermal efficiency and be dangerous. In the present invention, all of the heat is transferred to the top plate, so the above-mentioned problems are solved and significant effects can be expected.

For the above reasons, the electric heating unit of the present invention is excellent in ease of use and quality.

In addition, in the electric heating unit of the present invention, the heating wires only need to be placed in the grooves provided in the heat insulating base in advance.1. In addition, since it is only necessary to integrate the top plate, insulation base, and storage case, the cost is slightly higher than that of an electric stove, but it is possible to use a smooth top using ceramic or glass or an electric stove using a sheathed heater. It is cheaper compared to microwaves etc.

EXAMPLES Hereinafter, specific examples of the present invention will be described based on FIGS. 1 and 2. In the figure, 1 is a top plate made of 5PCC, and on the side of the heated object side of this top plate 1 is a radiation layer 1a made of a far-infrared material with excellent radiation characteristics, and on the opposite side,
Each insulating layer 1b is formed of a heat-resistant hollow material containing ceramic fibers having excellent heat resistance and thermal shock resistance. Reference numeral 2 denotes a heat insulating base made of vacuum-formed heat insulating material with a heat resistance temperature of 1200"C or higher, which is mainly composed of silica and alumina fibers. This heat insulating base 2 has meandering grooves 2a.
is provided.

3 is a spirally wound heating wire, and this heating wire 3 is disposed in a groove 2a provided in the heat insulating base 2. Reference numeral 4 denotes a storage case made of 5PCC for storing the heat insulating base 2 on which the heating wire 3 is arranged. There is. Further, the top plate 1 and the heat insulating base 2 are integrated with a slight gap. 6 is an insulator, and 6 is an electrical outlet terminal, which are provided on the lower side of the storage case 4.

In the electric heating unit of the present invention having such a configuration, the heating wire 3 generates heat through the electric outlet terminal 6, and the heat is transmitted through the top plate 1 to the food placed directly on the top plate 1, or to a trivet. It is transmitted indirectly through conduction and radiation when the food is placed on the table.

Furthermore, even if the contents boil over during cooking, it will drip onto the lower side of the storage case 4 through the top plate 1, so it will not come directly onto the heating wire 3. Furthermore, the heat of the heating wire 3 is transmitted toward the top plate 1, and hardly transmitted toward the heat insulating base 2 or the storage case 4. Therefore, food can be heated efficiently, and since the heat capacity of the top plate 1 alone is small, it cools down in a relatively short time when the power is turned off, making it possible to quickly move the electric heating unit. It can be stored and is very convenient to use.

Effects of the Invention As is clear from the above description, the present invention has a top plate made of a metal plate, a spirally wound heating wire, and a silica or It has a heat insulating base mainly composed of alumina fibers and a storage case made of a metal plate that houses the heat insulating base, and has a radiation layer on the side of the object to be heated and an insulating layer on the heating wire side of the top plate. At the same time, a slight gap is created between the top plate and the heat insulating base on which the heating wires are arranged, so that they are integrated, making it inexpensive and easy to use. It is possible to provide an electric heating unit with excellent quality.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an electric heating unit showing an embodiment of the present invention, and FIG. 2 is a sectional view of a top plate of the electric heating unit. 1...Top plate, 1a...Radiation layer, 1b.
...Insulating layer, 2...Insulating base, 2a...
...Groove, 3...Heating wire, 4...Storage case. Name of agent: Patent attorney Toshio Nakao and one other person (-
-Ichitomo handling 3-・4L Sanskrit i-bari 4- Storage case-7゜Figure 2

Claims (1)

[Claims] A top plate made of a metal plate, a spirally wound heating wire, a heat insulating base mainly made of silica or alumina fiber having a groove in which the heating wire is arranged in a meandering manner, and a heat insulating base that houses the heat insulating base. It has a storage case made of a metal plate, a radiation layer is formed on the side of the object to be heated of the top plate, and an insulating layer is formed on the side of the heating wire, and the top plate and a heat insulating base on which the heating wire is arranged. An electric heating unit characterized in that these are integrated with a slight gap between them.