JPH06203947A - Ceramic heater - Google Patents

Abstract

PURPOSE:To provide a mounting method of a ceramic heater mainly consisting of conductive carbon. CONSTITUTION:A ceramic heater is formed by modularizing and combining a heat transfer part consisting of a conductive ceramic material of a desired form in which the surface layer part is perfectly or partially covered with a heat non-conductor, and the inner part is formed by dispersing conductive fine particles in a ceramic medium at a desired concentration; and a power source part having conductive carbon as a resistant heating element. By giving molding property to the heat transfer part, the modularization is facilitated, and the heat transfer part of a required optional form can be integrated with the power source part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ceramic heater, and more particularly to a ceramic heater whose surface layer is completely covered with a heat-defective conductor and which has a desired shape in which conductive particles are dispersed in a ceramic medium at a desired concentration. The present invention relates to a ceramic heater in which a heat transfer section made of a conductive ceramic material and a power supply section having a conductive carbon as a resistance heating element are modularized and combined.

[0002]

2. Description of the Related Art Conventionally, an outdoor electric heater such as an electric heater for snow melting or an indoor electric heater for floor heating has a slow heating rate because a metal plate or plywood is laid as a floor material on the heat generating portion. It usually takes more than 40 minutes to raise from ℃ to 30 ℃, and the mechanical strength of the heating element itself is weak, so the moldability is poor, and the heating element cannot be directly waterproofed. There is a problem in that combustible materials such as plastic and wood must be used for the modularized parts because they are modularized by secondary processing in order to improve the insulation. For this reason, it is well known that conventional commercial products are not satisfactory in terms of temperature characteristics, safety and processability, and their applications are extremely limited.

[0003]

DISCLOSURE OF THE INVENTION The present invention has a remarkably excellent heat generation rate and heat capacity as compared with conventional electric heaters used for snow melting, floor heating, etc., and uses any combustible material. The purpose of the present invention is to provide a safe and novel ceramic heater, and by making it possible to manufacture an electrothermal heater having extremely excellent moldability, which is a fatal drawback of the conventional heater, The object of the present invention is to provide an electrothermal ceramic heater that can be applied to all shapes required for a product and can also be colored and designed on its surface.

[0004]

The present inventors have solved the conventional problems by using a conductive ceramic material in which conductive fine particles are dispersed in a ceramic medium at a desired concentration. That is, the present invention relates to a ceramic heater, and in particular, the surface layer is completely or partially covered with a heat-defective conductor, and the inside has a desired shape of conductive particles dispersed in a ceramic medium at a desired concentration. The present invention relates to a ceramic heater, characterized in that a heat transfer section made of a ceramic material and a power supply section using a conductive carbon as a resistance heating element are modularized and combined, and a moldability is given to the heat transfer section. This makes it easy to modularize and allows integration of the heat transfer part and the power supply part of any desired shape, and it is possible to obtain a product with free coloring and design on the surface of the molded product. It is something that has been trained.

The conductive material used in the present invention is obtained by uniformly dispersing carbon fine particles, stainless wool, etc. as conductive fine particles in a ceramic medium at an arbitrary concentration, and therefore, the required heat generation rate and heat generation are required. The capacity only needs to be adjusted by adjusting the type and concentration of the conductive particles, and especially when the electric heating part and the power supply part are made of the same heat-generating material, the heating rate can be significantly increased compared to the conventional product. ,
A power supply unit having an excellent high heat generation capacity can be attached very easily, and a product having a shape required because the heat transfer unit has moldability can be easily obtained. Furthermore, by combining with recent new fields such as road heating, agricultural and horticultural house heating, and runway heaters, the development of new cold-resistant products, which have hitherto been unknown, can be expected.

The ceramic heater of the present invention is generally used by a method of heating a part of the surface layer portion in combination with a power source portion after molding the ceramic composite material of the heat transfer portion into a module or a product. It should be understood that the heating is not limited to only heating, but may include heating of the entire surface.

[0007]

EXAMPLES Examples according to the present invention will be shown below, but it should be understood that these examples are merely for facilitating the understanding of the present invention and do not limit the present invention in any way.

Example 1 A conductive composite material composed of 20 g of carbon, 160 g of clay, and 40 g of wollastonite was 100 mm × 100.
The ceramic heater according to the present invention was obtained by molding into a size of 10 mm × 10 mm and firing. The thus-obtained material showed changes in the surface temperature shown in Table 1 below when electricity was applied.

[0009]

[Table 1]

Example 2 A conductive composite material composed of 26 g of carbon, 160 g of clay and 40 g of wollastonite was prepared as 100 mm × 100.
The ceramic heater according to the present invention was obtained by molding into a size of 10 mm × 10 mm and firing. The thus-obtained material showed changes in the surface temperature shown in Table 2 below when electricity was applied.

[0011]

[Table 2]

Example 3 An inverse square with an angle of 45 ° such that the area of the ground surface is the largest (square with a side of 700 mm), the area becomes smaller toward the lower part, and the area becomes the smallest at the bottom (200 mm on a side). The ground is dug into a frustum shape, and a square with a conductive carbon as a heat source at the bottom of 350 mm from the ground surface (250 m side)
m) flat ceramic heater is arranged, and 5 to 10% of conductive crystalline carbon and 1% of wollastonite are added to the crushed stone layer (1 part of cement, 3 parts of sand, 5 parts of stone). , And the conductive ceramic layer was formed. As a result, the temperature of this central part is 6
The temperature rose to 30 ° C. in 10 hours and 32 ° C. after 10 hours (outside air temperature 5 to 8 ° C.). Further, when the outside air temperature was 17 ° C., the temperature lowering rate required 5 hours to lower from 40 ° C. to 25 ° C.

[0013]

As is apparent from the above embodiments, according to the present invention, not only the control of the heat generation capacity is significantly facilitated by separating the power source part from the heat transfer part into a module, but also the surface layer. Insulation and insulation characteristics of the part make the heat retention time remarkably extended, and because the material is a ceramic-based granular mixture, it has molding characteristics and various designs can be freely applied, and conventional sheet heating elements etc. can be applied. Various fields that did not exist, such as snow melting roads, snow melting pipes, snow melting roof tiles, steam or hot water circulation type outdoor molded products for snowy areas, railway signal lights in cold snowy areas, greenhouse heating, livestock barn heating, water pipe freeze prevention Molded products, indoor containers such as drinking containers, bathtubs, toilets, oil heaters, indoor decorations for heating, road heating, runway heaters, agricultural and horticultural house heating, and other industrial materials. It is possible to.

Claims (5)

[Claims] 1. A heat transfer part made of a conductive ceramic material having a desired shape in which a surface layer part is covered with a poorly heat-conductive conductor and conductive particles are dispersed in a ceramic medium at a desired concentration, and conductive carbon. An electrothermic ceramic heater, characterized in that a power source section serving as a resistance heating element is modularized and combined. 2. The heater according to claim 1, which is of a buried type. 3. The heater according to claim 1, wherein the heater has an inverted quadrangular truncated pyramid shape. 4. The heater of claim 1 wherein the ceramic medium is a particulate ceramic mixture. 5. The minimum area is obtained by digging the ground in an inverted quadrangular pyramid at an inclination angle so that the area of the ground surface is the largest, the area gradually decreases toward the lower part, and the area becomes the minimum at the bottom surface. A method for heating the ground surface, characterized in that a resistance heating power source is arranged at the bottom of the power source, and a conductive granular ceramic mixture containing conductive crystalline carbon is filled on the bottom until reaching the ground surface, and then current is supplied.