JPS6233260Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an infrared radiant heater that has excellent thermal stability and electrical properties and is suitable for a panel type. In conventional heating elements such as panel heaters, a heating coating is formed on the surface of heat-resistant glass by spray coating technology, which requires a complicated process and makes it difficult to obtain a heating element with excellent electrical properties. Furthermore, a heat-generating coating formed of a kraft carbon resin sheet is also known, but it lacks heat resistance and cannot withstand use at temperatures of 150° C. or higher. An object of the present invention is to provide an infrared radiant heater having a heating element with excellent thermal stability and electrical properties. Another object of the present invention is to provide an infrared radiant heater in which the heat generating coating is separated into a plurality of coatings each having a predetermined power consumption area, and the separated coatings can be switched and used depending on the purpose. It is in. Embodiments of the present invention will be described below with reference to the accompanying drawings. In the figure, 1 is a heat-resistant non-conductive substrate;
Three radioactive heating coatings 2a, 2b, and 2c each having a predetermined power consumption area (for example, 600W, 300W, and 300W) are separately formed on its surface. This exothermic coating is obtained by applying a mixture of silicone resin, graphite powder, and organic solvent to the non-conductive substrate 1 and then baking it at a temperature of 250°C to 450°C. Furthermore, the electrical resistance value of the heat-generating coating can be adjusted by adding one or more types of insulating powder to the above-mentioned mixture. As is clear from FIG. 4, a conductive plate 5 and divided conductive plates 5a, 5b, 5c are disposed at opposite ends of each heat generating coating 2a, 2b, 2c in the current direction. ing.
The heat generating coating can be selected by operating the changeover switch S, and the desired amount of heat generated can be obtained. In the device of the present invention, in particular, the planar heat-generating coating 2
Good electrical contact is required between the conductive plates 5, 5a, 5b, 5c and special consideration has been given to reducing the contact resistance in this area. As is clear from FIGS. 2 and 3, the structure of the electrode portion is such that the electrode placement portion of the heat-generating coating 2 formed on the surface of the non-conductive substrate 1 is preliminarily coated with a silver base 3.
A carbon felt 4 is placed on top of the carbon felt 4, and a conductive plate 5 to which a lead wire L is fixed is placed on top of the carbon felt 4. The structure of the divided electrode side is the same, but the carbon felt 4 and the conductive plates 5a, 5b, 5c are separated from each other. Reference numeral 6 denotes an insulating board which is pressed from above by a frame 8 via an elastic body 7. That is, the frame body 8 is screwed to the main body frame 9 in such a manner that the electrode portions are brought into sufficient pressure contact with the heat-generating coating 2 . Furthermore, by using the carbon felt 4, the electrical resistance of the contact portion with the heating coating can be significantly reduced, thereby preventing loss. An additional note about the heat-generating coating mentioned above: This coating contains 100 parts by weight of silicone resin (resin only),
A suitable amount of an organic solvent such as benzene or toluene is mixed with a mixture of 80 to 250 parts by weight of graphite powder to form a fluid mixture, which is coated on a heat-resistant non-conductive substrate and heated at 250 to 450 degrees Celsius. It is obtained by firing at a temperature of about 100 mL, and provides the heat-generating coating itself with excellent thermal stability and electrical properties, and also improves the adhesion between the heat-generating coating and the substrate. In addition, this exothermic film is
It emits infrared rays with a wavelength of 9 microns, and infrared rays in this wavelength range have excellent temperature sensitivity to the human body.

[Brief explanation of the drawing]

Fig. 1 is an external view of the heater according to the present invention, Fig. 2 is a partially cutaway explanatory view of the heat generating board portion of the device according to the present invention, Fig. 3 is a sectional view taken along the line A-A in Fig. 2, and Fig. 4 4 is an explanatory diagram of the electrical system of the apparatus according to the present invention, and FIG. 4 is an explanatory diagram of the electrical system of the apparatus according to the present invention. 1...Heat-resistant non-conductive substrate, 2 , 2a, 2b,
2c... Heat generating coating, 3... Silver base, 4... Carbon felt, 5, 5a, 5b, 5c... Conductive plate, 6... Insulating board, 7... Elastic body, 8...
...Frame, 9...Main frame, S...Selector switch, L...Lead wire.

Claims (1)

[Scope of utility model registration request] A heat-resistant non-conductive substrate having a plurality of radioactive heating coatings formed on its surface, each having a predetermined power consumption area and an infrared ray emission area, a pair of electrodes disposed opposite to each other at both ends of each of the coatings, and each of the coatings. Each electrode includes a carbon felt placed on a silver base on the coating, a conductive plate placed on the carbon felt and provided with a lead wire, and a switch for selecting the conductive plate. An infrared radiant heater comprising an insulating board and a frame pressing the insulating board through an elastic body.