JPH0348875Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention is an electric heating device that heats a pot containing food, a pot containing coffee, etc., to keep the food, coffee, etc. warm or to boil it. Regarding.

(Prior art) Conventionally, electric heaters used for keeping food warm or boiling food generally use nichrome wire as a heating element, and the heat generated by the nichrome wire can be used directly or by Cooked foods were kept warm or boiled through a medium.

As a fixing method when attaching a nichrome wire used as a heating element to an electric heater, there is a method of forming a groove with heat-resistant insulator and inserting the nichrome wire into the groove to fix it, or a method of fixing the nichrome wire on the outer periphery of the nichrome wire with heat-resistant insulation. There are ways to surround it with objects, protect it with metal objects, and then secure it in place.

(Problem to be solved by the invention) In order to fix the nichrome wire to the electric heater by the above-mentioned means, considerable man-hours and expenses are required for the process of processing the nichrome wire and the process of attaching it. There were problems in that productivity was low and the nichrome wire was easily broken due to vibration and impact.

Therefore, in order to solve the above problems, the present invention proposes a technology to form a surface heating element by applying a paste-like electrical resistor over the entire surface of the heating area and curing it. This is a major issue.

(Means for Solving the Problems) The technical means for solving the above problems is to generate heat by passing a current through an electric resistor formed in a heating part, and to heat an object to be heated. This method involves coating the entire surface of the heating section with a resistor to form a surface heating element.

(Function) When a voltage is applied to the electrical resistor formed over the entire surface of the heating section by a coating means and a current is passed through the electrical resistor formed over the entire surface of the heating section, the electrical resistor formed over the entire surface of the heating section generates heat, thereby heating the heating section. For example, a heated object placed in contact with the heating section is heated.

(Example) Next, the structure and operation of an example of the present invention will be explained in the first example.
This will be explained with reference to FIGS.

The electric heater 1 shown in FIG. 1 is provided with a heat plate 3 in the center of a base 2 on which a pot, pot, etc. (not shown) is placed and heated. The heat plate 3 is made of metal with enamel treatment,
Alternatively, it may be formed of a mica plate, heat-resistant glass, fine ceramics, etc., and on the back side of the heat plate 3 there is an electric resistor 4 serving as a heating element and another electric resistor for uniformly generating heat from the heat plate 3, i.e. The surface heating elements 4C are applied by a high temperature baking method or the like in a superimposed manner, for example, in the shape shown in FIG. Electrical resistor 4
For example, a silver/palladium paste, a rutinium oxide paste, or the like is used, and a carbon paste is used for the surface heating element 4C, and the shape of the coating is determined depending on the required amount of heat generated.

As shown in the electrical circuit of FIG.
When power is supplied to the power supply ports 4A and 4B from, for example, a 100V commercial power source via the plug 5 and power cord 6, the power indicator lamp 7 lights up, and current flows through the electric resistor 4 and the surface heating element 4C. flows and generates heat. When the electrical resistor 4 and the surface heating element 4C generate heat, the electrical resistor 4 and the surface heating element 4C
Heat is conducted to the heat plate 3 coated with the heat, and heats the pots, pots, etc. placed on the heat plate 3.

an electric resistor 4 formed on the heat plate 3;
The surface heating element 4C is formed in close contact with the heat plate 3 by a coating means, and the heat generated from the electric resistor 4 and the surface heating element 4C is directly conducted to the heat plate 3, so that thermal efficiency is high. . Further, the process of forming the electric resistor 4 and the surface heating element 4C is a coating process, which simplifies the process and increases productivity. Further, since the electric resistor 4 and the surface heating element 4C are formed in a film shape, the space required for forming them is small, and the external dimensions of the electric heater can be reduced in size. Furthermore, since the electrical resistor 4 and the surface heating element 4C are formed by coating means, they are more susceptible to mechanical vibrations and shocks than when nichrome wire is used as the electrical resistor. becomes less.

(Effects of the invention) As described above, according to the invention, when a current is applied to the back surface of the flat heat plate on which the object to be heated is placed, which faces the object to be heated, heat is generated. A paste-like electrical resistor is formed into a linear shape using coating and firing means, and the ratio of the electrical resistor is adjusted so that the electrical resistor is overlapped with the electrical resistor in the area where the linear electrical resistor is formed. By forming a paste-like electrical resistor having a specific resistance greater than the resistor into a planar shape using coating and firing means, the heat plate can be heated to a high temperature capable of being boiled by the linear electrical resistance. The planar heating element has the effect of uniformly heating the heat plate with a temperature distribution.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the structure of an embodiment of the present invention, FIG. 2 is a partial detailed view thereof, and FIG. 3 is an electric circuit diagram of an electric heater. 1... Electric heater, 2... Base, 3... Heat plate, 4... Electric resistor, 4C... Surface heating element, 5
...Plug, 6...Power cord, 7...Power indicator lamp.

Claims (1)

[Scope of utility model registration request] A paste-like electrical resistor that generates heat when an electric current is applied is applied to the back surface of a flat heat plate on which the heated object is placed, which is opposite to the surface on which the heated object is placed, and a wire is formed using a baking means. On the other hand,
A paste-like electrical resistor having a resistivity greater than that of the electrical resistor is coated on the area where the linear electrical resistor is formed so as to be overlapped with the electrical resistor, using a baking means. An electric heater characterized by having a planar shape.