JPS6222369B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a panel heater used for space heating, heating, anti-freezing, etc.

Conventional panel heaters that have been put into practical use have an electric heater built into the bottom of the box, and the box is filled with nonflammable oil and heated by the electric heater, using the box as a panel heat source. What was formed,
There are panels in which cord-shaped heaters are distributed on the inner surface of the box, or sheet heaters are arranged in a panel-shaped heat source, and there are panel heaters that emit infrared radiation from the surface of the box. However, these panel heaters generally use a painted iron plate as a box, and emit infrared radiation at a surface temperature of about 70°C to 90°C, but because heat energy escapes from the surface through convection, the input heat energy is The radiation efficiency is low. Conventionally, as an attempt to improve this radiation efficiency, as shown in Figs. Although attempts have been made to increase the surface area, the heat loss due to convection remains almost unchanged, and the silicic acid particles 6 forming the rough surface 10 tend to peel off due to friction, resulting in severe deterioration over time. This impairs the practical effect.

The present invention aims to improve the drawbacks of the conventional example and increase the efficiency of infrared radiation, and provides an efficient heating method that prevents the aging of the rough infrared radiation surface and reduces heat loss due to convection. The purpose of this invention is to provide a panel heater that achieves this goal.

The panel heater according to the present invention uses a box containing the heat source described above as a panel heat source, has a rough surface formed on the surface of the box using an infrared radiating material with excellent infrared radiation efficiency, and has a surface of the rough surface. The panel heater is constructed by covering the surface with a thin film material, such as by pasting it, in contact with the vertices and convex parts of the rough surface and forming an air layer in the depressions of the rough surface.The thin film material mentioned above has excellent infrared transmittance. In the case of an infrared transmitting material, the material is not necessarily formed into a thin film, but is coated to form a panel heater.

As mentioned above, the panel heater according to the present invention has a rough surface made of an infrared radiating material, so that
It has a wide infrared radiation surface area and excellent infrared radiation efficiency, and the coating is applied to form an air layer in the concave parts of the rough surface, so it can be used for silicic acid particles, zirconium oxide particles, and aluminum oxide that form a rough surface. It protects infrared radiating materials such as particles, titanium oxide particles, transition metal oxide particles, and other infrared absorbing metal oxide particles from peeling off due to friction, and prevents rough surfaces from deteriorating over time, and the air layer is a low thermal conductive layer. This has the effect of improving infrared radiation efficiency by reducing the heat escaping from the panel heater surface through convection. By using a thin film material as this surface coating material, the infrared rays radiated from the rough surface described above are transmitted through without being absorbed. When using an infrared transmitting material with excellent infrared transmittance, by increasing its thickness, the heat insulating performance of the surface coating material contributes in addition to the heat insulating performance of the air layer, and it is possible to emit infrared radiation. It is. In this case, it goes without saying that materials that transmit infrared rays and have low thermal conductivity are more effective.

FIG. 3 shows a sectional view of the heater unit portion of the panel heater of the present invention, and FIG. 4 shows an enlarged sectional view thereof. An embodiment of the present invention will be explained with reference to FIGS. 3 and 4.
A planar heating element 3 is arranged on the inner surface of the box 1 via an insulating coating A2, and covered with an insulating coating B4 and a heat insulating layer 5 to form a panel-shaped heat source section, and zirconium oxide particles 6 are placed on the surface of the box 1. is coated with a silicone resin binder 7, and a silicone resin thin film 8 is further attached to form an air layer 9.

The silicone resin thin film 8 has a smooth surface and is elastic, and protects the zirconium oxide particles 6 from external mechanical forces, especially friction, and prevents them from peeling off.
This has the effect of maintaining the infrared radiation properties of the zirconium oxide particles 6 and preventing the infrared radiation efficiency from decreasing over time due to peeling.

Furthermore, an air layer 9 is formed in the recessed portion of the coating film 10 of the zirconium oxide particles 6 by the silicone resin thin film 8.
Since air has low thermal conductivity, it has the effect of reducing heat loss due to convection, and for the same input power to the heating element 3, the temperature of the zirconium oxide particles 6, which are infrared radiators, is increased. This increases the amount of infrared radiation and reduces the power input to the heating element 3 for the same temperature of the zirconium oxide particles 6, resulting in an energy saving effect. Normally, in the structure of Japanese houses, the airtightness of the room is poor, so even if the temperature of the room is raised by convection, it will be released by natural ventilation and will hardly contribute to warming, but infrared radiation will be directly absorbed by the human body, so the airtightness of the room is poor. Although it can be said to be an efficient method for heating a room with a low temperature, the panel heater of the present invention is effective in realizing a panel heater that has a large ratio of energy emitted by radiation to input energy. This is a means to realize an efficient heating method.

The silicone resin thin film 8 is a material with excellent infrared transmittance, and because it transmits the infrared rays radiated from the zirconium oxide particles 6 without absorbing it, the infrared radiation efficiency is hardly reduced. It is desirable that the coating thickness of the silicone resin binder 7 is as thin as mechanical strength allows, and the air layer 9 is made large to improve the heat insulation effect and to increase the exposed surface area of the zirconium oxide particles 6 against variations in particle size. This is effective in forming a rough surface, and thus contributes to improving infrared radiation efficiency.

In place of the zirconium oxide particles 6, infrared absorbing metal oxide particles such as silicic acid particles, aluminum oxide particles, titanium oxide particles, and transition metal oxide particles can be used.

In place of the silicone resin thin film 8, an infrared transparent material such as a fluororesin such as tetrafluoroethylene resin or a thin film having mechanical strength may be used.

It goes without saying that configuring the air layer 9 so that it does not communicate is effective in terms of heat insulation, and is an implementation method that has the effect of improving the effects of the present invention.
It goes without saying that the panel-shaped heat source can be made into a cylindrical or polygonal shape to form an all-around panel heater.

As mentioned above, the present invention increases infrared radiation efficiency,
This has the effect of making it possible to provide a panel heater that prevents aging of the rough infrared radiation surface and realizes an efficient heating method that reduces heat loss due to convection.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional panel heater unit, FIG. 2 is an enlarged view of the same, FIG. 3 is a sectional view of a panel heater unit of an embodiment of the present invention, and FIG. 4 is an enlarged view of the same. 1... Box, 3... Heating element, 6... Particle, 7...
...Binder, 8...Thin film, 9...Air layer, 10...
…Rough surface.

Claims (1)

[Claims] 1. A panel heater in which a rough surface is formed on the surface of a heat source using an infrared radiating material, the rough surface is coated with an infrared transparent material or a thin film material, and an air layer is formed in the recesses of the rough surface.