JPS622485A - Surface heater - 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 Field of Industrial Application The present invention relates to a planar heater used as a heating source in equipment such as space heaters, cookers, and dryers, and particularly to a planar heater using an insulating mica plate. It is.

Conventional technology In recent years, planar heaters have come into the spotlight as heating sources that meet the demands of thinning equipment, uniform heating, and the application of far infrared rays. There are several types of heaters on the market.

(1) A device with a structure in which a heater is wound around an insulating substrate such as a mica board.

(2) A structure in which a conductive pattern is formed on an alumina substrate using a conductive base such as tungsten, and an alumina substrate is further provided on top of the conductive pattern, which is integrally molded.

(3) It has a laminated structure in which a conductive pattern is formed between organic films such as silicone and polyimide.

Among these planar heaters, what is commonly called a mica heater, which has a structure in which the heater is wound around an insulating substrate such as a mica plate shown in (1), which is inexpensive, is often used.

Generally speaking, this mica heater is
As shown in Japanese Patent No. 8225, a conventional heating wire or a ribbon-shaped heating element is wound around an insulating mica plate, and this is integrated into two insulating mica plates in the form of a shisandite. Publication No. 7998/1982 or Utility Model Application No. 58/1983
As shown in Japanese Patent No. 17356, a heating element formed by etching or pressing a metal foil is integrated in a sandwich shape with two insulating mica plates in the same manner as above, and a toaster is produced. It is applied to a variety of products such as pots, heat insulators, etc.

On the other hand, as mentioned above, these mica heaters are used at relatively low temperatures, such as toasters, pots, and warmers, or in locations that are not highly corrosive, or where they cannot be seen by the user. The structure described above is fully practical as a heating source, but it cannot be used as is in a relatively high temperature range, in a highly corrosive environment, or in a place where the user can see it, so one side of the mica heater Or, it is used with metal plates in contact with both sides.

However, when a metal plate is used in contact with a mica heater, the thermal efficiency varies significantly depending on the contact method and the surface condition of the metal plate. In reality, a bulge is provided in the longitudinal direction of the metal plate that is brought into contact with the mica heater to improve adhesion.

Problems to be Solved by the Invention However, in the sheet heater using the conventional mica heater described above, (1) When a conventional heating wire or ribbon-shaped heating element is used as the heating element, three insulation sheets are used. Since it is necessary to use a mica plate, the heat capacity is limited, and as a result, heat transfer to the heated object is delayed.

@) Suppose we use a photo-etched or pressed metal foil as a heating element, and two insulating mica plates.
If the number of sheets is reduced, the heat capacity will be reduced, but in this case, the cost will increase significantly.

(3) Merely bringing a metal plate into contact with the mica heater results in poor thermal efficiency.

The reality is that there are various problems.

The present invention solves these problems, and aims to provide an inexpensive planar heater that can quickly and efficiently transfer heat to an object to be heated.

Means for Solving the Problems In order to solve the above problems, the present invention provides a smooth lath 11.
One side of the heater body is made up of a heater element made of four metal foils placed between two insulating mica plates, one side of which is coated with a far-infrared emitting material, and the other side of which is a metal treated with black. The plate is positioned so that the black treated side of the metal plate is on the side of the heater body, and a reflective plate made of a metal foil with high reflection efficiency and a heat insulating material are sequentially positioned on the other side of the heater body, These are integrated.

Function According to the above configuration, since a heater element made of a smooth lath mesh metal foil body is used as a heating element, it is very inexpensive compared to conventional metal foils made by photo-etching or pressing. In addition, you can get
Since the heater body is constructed by placing the heater element between two insulating mica plates, the heat capacity can be extremely reduced.

In addition, the metal plate integrated into the heater body is black-treated to ensure rapid heat transfer from the heater body, so in addition to heat conduction, sufficient heat transfer is achieved through radiation. Moreover, since the heated side of the metal plate is coated with a far-infrared emitting material, the heat from the heater body can be efficiently transferred to the heated object side by radiation.

On the other hand, on the other side of the heater body, a reflective plate made of metal foil with high reflection efficiency and a heat insulating material are sequentially provided.
Heat from the heater body can be efficiently transferred to the metal plate side, and since a metal foil with a small heat capacity is used as a reflector, the startup speed of the heater will not be slow. , heat can be transferred quickly and efficiently to the object to be heated.

EXAMPLE Hereinafter, an example of the present invention will be described based on FIGS. 1 to 5. In the figure, 1 is the heater body, and the heater element 1b made of a smooth lath mesh metal foil such as 5US430 is placed between two insulating mica plates 1a. The heater element 1b is connected to an electrical output terminal plate 1C made of a metal foil such as 5US430 by spot welding.

2 is a metal plate, one surface of the metal plate 2 is coated with a far-infrared emitting material 2a such as zirconia or alumina, and the other surface is blackened 2b with a high-efficiency radiator such as nickel oxide. Furthermore, on the other side of the heater body 1, there is a reflector plate 3 made of a metal foil body with high reflection efficiency such as aluminum foil, and a heat insulator made of heat-resistant inorganic fiber or the like following this reflector plate 3. The materials 4 are placed in sequence.

These components are fixed and integrated with an inorganic adhesive or screws to form the planar heater of the present invention.

In the planar heater having the above structure, the heater body 1 is heated when electricity is supplied to the heater element 1b through the electrical output terminal plate 1C, and at this time,
Heat is efficiently transmitted in one direction of the metal plate 2 by the action of the reflective plate 3 and the black treatment 2b of the metal plate 2. The heat transferred to the metal plate 2 heats the far-infrared radiation material 2a covering one side of the metal plate 2, and the object to be heated is efficiently heated by the action of this far-infrared radiation. Can be heated.

Effects of the Invention As is clear from the above description, according to the present invention, one side K of the heater body is made of a smooth lath mesh metal foil body and the heater element is positioned between two insulating mica plates. A metal plate coated with a far-infrared emitting material and whose other side is black-treated is positioned so that the black-treated side of the metal plate faces the heater body, and a reflective plate is placed on the other side of the heater body. A reflective plate made of highly efficient metal foil and a heat insulating material are placed in sequence, and these are integrated to form a planar heater, allowing for fast and efficient heat transfer to the heated object. In addition, it can be obtained at a lower cost than conventional metal foils made by photo-etching or pressing.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a planar heater showing an embodiment of the present invention;
Fig. 2 is an enlarged sectional view of the main part of the coplanar heater, Fig. 3 is a perspective view of the metal plate in the coplanar heater, Fig. 4 is a front view of the heater element in the coplanar heater, and Fig. 5 is the same. It is a perspective view of the electrical output terminal board in a heater. 1..-Base body, 1a..- Insulating mica plate, 1b.. Heater element, 2..
・Metal plate, 2a-°°. Far-infrared emitting material, 2b-...black treatment, 3...
...Reflector, 4...Insulation material. 4-11 side 1 smart material 2nd figure fa---Itta Moxibustion Shimaikazaka fb-11 heag element

Claims (1)

[Claims] One side of the heater body is made up of a heater element made of a smooth lath mesh metal foil placed between two insulating mica plates, one side is coated with a far-infrared emitting material, and the other side is treated black. A metal plate is placed so that the black-treated side of the metal plate faces the heater main body, and a reflective plate made of a metal foil with high reflection efficiency and a heat insulating material are sequentially placed on the other side of the heater main body. A planar heater characterized in that these are integrated.