JPS60198081A - Far infrared 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 The present invention is a method of transferring thermal energy to an object by directly absorbing electromagnetic liquid emitted from a heat source into an object to be heated without any medium, thereby transmitting heat due to molecular vibration within the object. This relates to far-infrared heaters that emit infrared rays in the wavelength range of 3P to 20P, which are easily absorbed by many substances and are heat radiation that can heat efficiently and quickly in a short period of time. □ A far-infrared radiation plate is laminated on the front side of the heating element which is sandwiched between inorganic flat plates and integrated by pressure, and a reflecting plate is laminated on the back side of the heating element and these are integrated with excellent electrical insulation properties. Regarding a far infrared heater.

As mentioned above, this type of far-infrared heater has strong radiation properties, and can directly and efficiently heat the object to be heated without heating the air in between. It can be used to heat a wide range of substances, has a high heat transfer rate and can sufficiently transmit heat to the inside of the substance, and has a soft temperature effect on the human body.
It has many advantages such as being non-polluting, easy to downsize equipment, and easy to control temperature, and is effectively used for heating and drying in various fields of grain production.

The first important condition for a far-infrared heater configured as described above is that the emissivity of the radiation plate is high and that a sufficiently large amount of radiation can be obtained at a low surface temperature.

In order to meet this demand, our authors have discovered that certain types of ceramics, such as alumina porcelain, graphite, silica, and zirconia, emit far-infrared rays when heated to red, and that highly pure alumina porcelain is particularly efficient. We realized that it has the property of emitting far-infrared rays over long wavelengths,
Taking advantage of this, we have developed a radiation plate that aims to increase the emissivity.

Is it a very humid non-oxidizing heat source ranging from 5.0006C to 7.000C? In this case, the molten powder is accelerated by a plasma jet through a thermal spray gun and sprayed onto the surface of a heat-resistant insulating plate such as mica to form an alumina porcelain film. Not only does it require aluminum evaporation as a base for thermal spraying on the surface of the plate, but it also requires very high energy and kinetic energy, resulting in a significant increase in processing costs.Moreover, the plasma sprayed coating is easily broken, making it difficult to use for -dimensional sheet heaters. However, there are still many difficulties in practical terms.

In view of the above circumstances, an object of the present invention is to provide a far-infrared heater that utilizes an infrared emitting ceramic material such as Filmina porcelain, and which can significantly reduce processing costs and expand the range of uses in terms of form. .

In the far-infrared heater according to the present invention developed to achieve the above object, the far-infrared radiation plate is composed of a heat-resistant insulating inorganic powder material and a far-infrared radiation emitting powder material. It is characterized by its composition in which it is formed by mixing it with the following and forming it into a plate shape under high temperature and pressure, and as a result, the following special effects can be expected.

In other words, when using a ceramic material that emits far infrared rays by red heat to increase the emissivity from a radiation plate, instead of heating and melting the ceramic powder material to a very high temperature that allows spraying, mica powder etc. Originally, when a heat-resistant insulating inorganic powder material is press-molded into a plate shape by pressing a powder material, the ceramic powder material is mixed with an appropriate amount of binder and the material is hot-pressed into a plate under high temperature and high pressure. Since it is molded into a shape, there is no need for separate processes such as thermal spraying, high thermal energy to melt the ceramic powder material and high kinetic energy accelerated by plasma jet, and aluminum vapor deposition etc. Due to the synergistic effect of eliminating the need for a catarizer, processing costs and, ultimately, product costs can be significantly reduced. Moreover, unlike surface spray coatings, the ceramic powder material is dispersed within the thickness of the reflector, making it strong and flexible against mechanical stress such as bending, and curved surfaces can be processed without causing cracks. Therefore, it is easy to manufacture not only flat heaters but also two-dimensional and three-dimensional curved heaters corresponding to various uses, and the range of uses of this type of heater can be further expanded.

An embodiment of the present invention will be described below in detail with reference to the drawings.

In Figures 1 and 2, (1) is a heating element, made of stainless steel, Niracle, Nichrome, etc. several hundred thick, and shaped into any shape, such as the pattern shown in Figure 3, depending on the electrical capacity. The heating element (IA) is etched or stamped using a press die, and is sandwiched between two inorganic thin flat plates (113) and (IB) made of asbestos, mica, etc., which have excellent heat resistance and electrical insulation properties. They are sandwiched and crimped together under high temperature and pressure. (2) is a far-infrared radiation plate stacked on the surface side of the heating element +11, and 7'1. Mica powder material (2A), which is a typical example of a heat-resistant insulating inorganic powder material, and alumina porcelain, which is a typical example of a far-infrared emitting ceramic material, or a combination of these materials may be used) are mixed with a suitable adhesive and hot bonded. It is formed into a plate shape with a thickness of 0.3 to several scales using a press under high temperature and high pressure to form a cross-section frp Qi structure as shown in Figure 4s4.
G5. It's something new.

(3) is a reflective plate superimposed on the back side of the heating element +11, and as shown in Fig. 5, I″L is an aluminum Foil (
3B)k It is laminated to prevent peeling even under high temperatures.

The above heating element (1), the radiating plate (2) and the reflecting plate +31 with superimposed positions on the front and back sides of the heating element (1) are attached to an aluminum or iron case frame (6) with a U-shaped t-1 cross section. It is integrated and integrated.

Although such a far-infrared heater can be used as a one-dimensional planar heater, for example, as shown in Figure 6 (a) and (b), the surface of the radiation plate (2) is concave or curved. It can also be used as a two-dimensional or three-dimensional surface heater by processing the surface into a convex shape to perform local heat collection and diffuse radiation.

The following embodiments will be described.

IJ) The case shown in Fig. 7 is constructed using a toothed case frame that completely forms an air layer (6) on the back side of the reflector (3) as the case frame (5). This has the advantage of suppressing heat dissipation due to heat conduction to the back side and further increasing forward radiation efficiency.

(II) The one shown in Figure 8 has a heat insulating material (7) sandwiched between the back of the reflector (3) and the bottom of the case frame (5) to suppress heat loss to the back side. This is slightly lower than the one shown in Figure ff17, but it is effective in increasing radiation efficiency.

[Brief explanation of the drawing]

Fig. 1 is a schematic perspective view showing an example of the present invention, Fig. 2 is a partially cutaway longitudinal sectional view, Fig. 3 is an enlarged perspective view of a heating element, and Fig. 4 is an enlarged longitudinal sectional view of a radiation plate. FIGS. 6A and 6B are enlarged perspective views of the reflector, FIGS. 6A and 6B are schematic views of usage examples, and FIGS. 7 and 8 are enlarged longitudinal sectional views showing different embodiments, respectively. +11... Heating element, (IA)... Heater element, (1 average... Inorganic flat plate, (2
)... Radiation plate, C2θ... Inorganic powder material 1., (2B)... Ceramic powder material, (
3)...Reflector plate, (3A)...Body heat insulating plate, (3υ...Aluminum foil. Figure 1)

Claims (1)

[Claims] ■ Heater element αA) t- Far infrared rays are emitted on the surface side of the heating element +11, which is sandwiched between inorganic flat plates (1 wholesale, 0B) with excellent heat resistance and electrical insulation properties and integrated by pressure. Board (2
), and a reflector plate (3) is fully laminated on the back side of the heating element +11 and these are integrated, the far-infrared heater comprising a heat-resistant A far-infrared heater characterized in that the insulating inorganic powder material (G2A) is completely mixed with the far-infrared emitting ceramic powder and the powder material (2B) and formed into a plate shape under high humidity and high pressure. (2) The far-infrared heater according to claim 0, wherein the ceramic powder material (2B) constituting the radiation plate (211) is an alumina porcelain powder. (2) The heater elements α to (1) are formed into an etched or pressed mold. The far infrared heater O according to claim 0, which is made of The far-infrared heater according to claim 0. ■ Claim 0, wherein the heat-resistant insulating powder material (2A) and the heat-resistant insulating plate (3A) are mica, or The far-infrared heater according to item 0.