JP2000048935A - Lightweight heating panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lightweight heating panel having a uniform temperature rise on the surface and excellent in thermal efficiency by heat insulating and heat preserving actions by using a composite material of foam body grains formed with a continuous layer of aluminum among grains and/or fibered grains and aluminum as a panel base material, and incorporating a flat heating source on the surface of the composite material. SOLUTION: Foamed grains and/or fibered grains having the specific gravity smaller than that of aluminum are dispersed in the continuous phase of aluminum (including an aluminum alloy) at the ratio of 35-60 vol.% against the continuous phase 40-65 vol.% to obtain a panel base material 1. A presser plate 13 is pressed on the surface of the panel base material 1 via an insulating sheet 12, the presser plate 13 is covered with a cover body 14 via a heat insulating mat 18 as required, and the whole is fixed by set screws 15 and screw holes 5 bored on the panel base material 1 to obtain a lightweight heating panel 10. A guide 22 provided with a temperature control element 21 at the center section of a heater 20 is pinched by upper and lower electrode heat plates 23, 23.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat generating panel used for a surface material of a snow-melting roof or a floor heating device, a heat generating base for a cooking hot plate, and the like. About the panel.

[0002]

2. Description of the Related Art Heating panels used as snow-melting roofs or floor heating devices have conventionally been made by passing a heat medium through a pipe laid inside a structural material or inside the device, or an electrical panel made of carbon fiber or the like as a base material. What laminated | stacked the planar heating element is known. For example, as a snow melting roof,
These techniques are disclosed in JP-A-2399 and JP-A-8-120836.

[0003]

However, since a general roofing material or a flooring material is used as a base material of these conventional heat generating panels, the panels themselves are heavy and have poor heat insulation and heat storage properties, resulting in poor thermal efficiency. not good. In addition, when piping work is involved, there is a problem that the installation becomes large.

[0004] The present invention has been made in view of the above-mentioned drawbacks of the prior art, and has as its object to transmit heat over a wide range, to increase the temperature of the surface uniformly and quickly, and to insulate the heat.
An object of the present invention is to provide a lightweight heat-generating panel which is excellent in thermal efficiency by a heat storage effect.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a panel base material, comprising aluminum and a foam particle and / or fibrous particle in which a continuous phase is formed between the particles and aluminum. The composite material was used, and a planar heat source was incorporated on the surface of the composite material.

[0006] By making the composite material 40 to 65% by volume of foam particles and / or fibrous particles and 35 to 60% by volume of aluminum, a light-weight heat-generating panel with particularly excellent thermal efficiency can be obtained.

[0007]

According to the present invention, since the foam particles and the fibrous particles have the functions of heat insulation and heat storage, the aluminum forming the continuous phase makes use of the excellent thermal conductivity. To quickly transmit heat over a wide area.

Further, since the composite material is made of aluminum and foam particles and / or fibrous particles, the weight of the panel itself can be reduced.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The composite material used in the present invention is prepared by laying a panel of foam particles such as shirasu balloons and glass balloons and fibrous particles such as glass fibers, and injecting aluminum between the particles to form a continuous phase. Is formed. FIG. 1 schematically shows a cross section of a composite material as a panel substrate constituting the present invention.

As shown in FIGS. 1 (a), 1 (b) and 1 (c), a panel substrate 1 is composed of a continuous phase 2 made of aluminum (including an aluminum alloy) and foam particles 3 having a lower specific gravity than aluminum. And / or fibrous particles 4 dispersed therein.

Examples of the foam particles 3 include a shirasu balloon made of calcined shirasu of volcanic ash and made into a fine hollow body, a glass balloon crushed from a used glass bottle and baked and foamed, obsidian, perlite and pine stone. There are balloons that are crushed and fired and foamed. The foam particles 3 may be a single-cell hollow body as shown in FIG. 1A or a hollow body containing a plurality of closed cells as shown in FIG. The particle diameter of the foam particles 3 is 0.1 to 5.0 mm, preferably 0.3 to 5.0 mm.
3.0 mm is preferred. When the particle size is smaller than 0.1 mm, the gap between the particles becomes small, and aluminum hardly penetrates, thereby hindering the formation of a continuous phase. When the particle size is larger than 5.0 mm, the strength of the foam particles becomes weak and aluminum Breaks down during penetration.

The composition of the foam particles 3 and / or the fibrous particles 4 and the aluminum continuous phase 2 is such that the former is 40 to 65% by volume.
The latter is 35 to 60% by volume. If the continuous phase 2 of aluminum is less than 35% by volume, the amount of aluminum may be insufficient and a part of the continuous phase may be interrupted to deteriorate the thermal conductivity. If it exceeds 60% by volume, the effect of weight reduction is reduced. Because.

When the foam particles and / or fibrous particles are completely covered with aluminum so as not to be exposed to the outer surface, the panel surface is less likely to be damaged, and the durability can be improved.

Next, an embodiment of the structure of the lightweight heat generating panel of the present invention will be described with reference to an exploded view shown in FIG.

FIG. 4 is an enlarged view of the heat generating portion of the example shown in FIG.

The lightweight heat-generating panel 10 is a panel base 1
A heater 20 is placed on the surface of the heater through an insulating sheet 12, and the heater 20 is pressed by a pressing plate 13 via the insulating sheet 12, and the upper part of the pressing plate 13 is covered with a heat insulating material 18 if necessary. It is covered with a body 14 and has a structure in which the whole is fixed by a set screw 15 and a screw hole 5 drilled in the panel substrate 1. In the figure, reference numeral 16 is a washer,
Reference numeral 17 denotes a sleeve spacer.

The heater 20 comprises a guide plate 22 provided with a temperature control element 21 at the center and upper and lower electrode heating plates 2.
The structure is sandwiched between 3, 23. The shape of the electrode plate may be a rectangular shape as shown or a circular shape. 24 is a conductive wire, 25 is a coating tube. A through hole is formed in the center of the guide plate 22, and the temperature control element 21 is installed in the opening. The temperature of the hot plate of the electrode hot plate 23 is automatically maintained at the set temperature by the temperature control element 21.

As a heat source, conventional heaters, such as a wire heater and a plane heater, which are arranged in a plane, are used.

The shape of the panel substrate 1 is not limited to a flat plate, but may be arbitrarily designed, for example, it may be bent into a mountain shape or a wavy shape, or its thickness may be changed.

Examples and comparative examples will be described below.

[0021]

Example 1 A specific gravity of 0.4 and a particle size of 0.
A glass balloon of 3 to 0.84 mm is filled, then molten aluminum is poured into a mold, and aluminum is allowed to penetrate into the gap between the glass balloons as a continuous phase, and a flat panel substrate is used so that the glass balloon is not exposed on the surface. Was prepared. The shape of the above panel is thickness 6mm, 400m
At m-square, the ratio of glass balloon to aluminum was 62%: 38% by volume. The specific gravity of the obtained panel is 1.3, the tensile strength is 0.69 kg / mm ² ,
The bending strength was 2.11 kg / mm ² . This is enough strength as a roofing material.

On one side of this panel substrate, a diameter of 25 mm
Are arranged at the positions of the heater yellow and the heater red in FIG. 5 and have a thickness of 6 mm and a thickness of 400 mm.
A light-weight heat-generating panel of mm square was manufactured. The temperature rise on the surface opposite to the surface on which the heater of the lightweight heat-generating panel was provided was measured, and the results are shown in FIGS. 7 and 8. The set temperature of the heater was set to 110 ° C., and the measurement was performed as shown in FIG.
The test was performed at five positions. The unit of the measured value is ° C. The power was turned on and turned off 90 minutes later.

No. 1, No. 10, and No. 11 in FIG.
These are the measurement results at the positions indicated by (1), (10) and (11) in FIG. From FIG. 7, it can be seen that despite the presence of two heaters on a 400 mm square panel, a sufficient temperature rise is quickly observed even at the position farthest from the heat source, and that the normal state is quickly restored when the heat source is opened. Moreover,
As is clear from FIG. 8, the temperature rise and the reached temperature are slightly higher immediately near the heater, but are almost uniform over the entire 400 mm square panel.

[0024]

[Comparative Example 1] A base material panel was made of an aluminum plate (6 mm × 4
A heat-generating panel was produced in the same manner as in Example 1 except that the heat-generating panel was formed in the same manner as in Example 1, and the same temperature rise as in Example 1 was measured. FIG. 9 shows the result. Note that the measurement method in FIG. 9 was performed in the same manner as in FIG.

FIG. 9 shows that a sufficient temperature rise cannot be obtained in the case of aluminum. This is because aluminum has good heat conduction and radiates heat faster than storing heat.
FIG. 9 shows that the temperature rise occurs uniformly on the entire surface of the panel, but the ultimate temperature is not sufficient.

[0026]

Example 2 A flat panel was produced in the same manner as in Example 1 except that the ratio of the glass balloon having a specific gravity of 0.3 and a particle diameter of 0.84 to 1.2 mm was 42% by volume of aluminum and 58% by volume of aluminum. The specific gravity of the obtained panel is 1.7, the tensile strength is 2.5 kg / mm ² , and the bending strength is 4.8 kg / mm.
^{Was 2} .

Using this panel, the state of temperature rise was examined in the same manner as in Example 1. As a result, the results were almost the same as in Example 1.

[0028]

Example 3 A flat panel was produced in the same manner as in Example 1 at a ratio of 70% by volume of a glass balloon and 30% by volume of aluminum having a specific gravity of 0.4 and a particle size of 0.3 to 0.84 mm. The specific gravity of the obtained panel is 1.1, the tensile strength is 0.3 kg / mm ² , and the bending strength is 0.8 kg / m.
m ² .

When the temperature rise was examined using this panel in the same manner as in Example 1, there were some places where the temperature rise hardly occurred. This is because the amount of aluminum was rather small, and there were some portions where the continuous phase of aluminum was interrupted.

[0030]

Example 4 A flat panel was produced in the same manner as in Example 1 except that the ratio of the glass balloon having a specific gravity of 0.3 and a particle diameter of 0.84 to 1.2 mm was 37% by volume and aluminum was 63% by volume. The specific gravity of the obtained panel is 1.8, the tensile strength is 2.4 kg / mm ² , and the bending strength is 4.7 kg / mm.
^{Was 2} .

Using this panel, the temperature rise was examined in the same manner as in Example 1. As a result, the temperature reached on the panel surface was slightly lower than that in Example 1.

Next, in order to examine the amount of heat transferred from the surface of the lightweight heat-generating panel of the present invention to the outside, aluminum containing 300 cc of tap water was placed on the other side of each heat-generating panel used in Example 1 and Comparative Example 1. Was placed, the panel was heated, and the water temperature was measured. The results were as follows. Example 1 (composite material) Comparative Example 1 (aluminum plate) Water temperature (° C) Water temperature (° C) Start 17.9 16.8 After 10 minutes 24.8 20.3 20 31.0 22.7 30 34.5 23 0.760 39.7 27.6 90 40.6 28.7 120 41.4 29.5 Calculation of the amount of heat given to water In the case of the composite material of Example 1, 300 × (41.4-17.9) = 7050 cal / 2
Time In the case of the aluminum plate of Comparative Example 1 300 × (29.5-16.8) = 3810 cal / 2
Time, ie, the composite material is aluminum plate, 7050/3810 =
This means that 1.85 times the amount of heat was given to water.

[0033]

According to the present invention, since the panel substrate is made of a composite material of foam particles and / or fibrous particles and aluminum, it is lightweight and easy to handle, and the foam particles and / or fibrous particles are easy to handle. Both the heat insulating properties of the particles and the thermal conductivity of aluminum are moderately exhibited, and the surface temperature rises uniformly and quickly over a wide range.
A lightweight heat-generating panel with good thermal efficiency and low energy consumption can be obtained by the heat storage function.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an example of a panel base material.

FIG. 2 is a cross-sectional view illustrating an example of a foam.

FIG. 3 is an exploded perspective view showing an example of a heating panel.

FIG. 4 is an enlarged cross-sectional view showing a heat generating portion of the above.

FIG. 5 is a plan view showing an arrangement of a heating panel and a heater according to the embodiment.

FIG. 6 is a plan view showing a temperature measurement position of the heating panel of the embodiment.

FIG. 7 is a graph showing temperature measurement results.

FIG. 8 is a table showing temperature measurement results.

FIG. 9 is a table showing temperature measurement results of a comparative example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Panel base material 2 Aluminum continuous phase 3 Foam particles 4 Fibrous particles 5 Screw hole 10 Heat generation panel 12 Insulation sheet 13 Press plate 14 Cover 15 Set screw 16 Washer 17 Sleeve spacer 18 Heat insulation mat 20 Heater 21 Temperature control element 22 Guide 23 Electrode heating plate 24 Conductive wire 25 Coated tube

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shoichi Makimoto 3-6-8 Kutaro-cho, Chuo-ku, Osaka-shi Toyo Aluminum Co., Ltd. F-term (reference) 3K092 PP03 PP20 QA05 QB03 QB18 QB31 QC03 QC26 RF03 RF09 RF26 SS14 TT07 VV04 VV16 VV22 VV33

Claims (2)

[Claims] 1. A composite comprising aluminum and at least one of foam particles and fibrous particles having a specific gravity smaller than aluminum, wherein the aluminum is the foam particles or fibrous particles, or foam particles and fibers. A lightweight heat-generating panel comprising: a panel substrate forming a continuous phase between the particle-shaped particles; and a heat source provided at an appropriate position on at least one surface of the panel substrate. 2. The lightweight heat-generating panel according to claim 1, wherein the composite material comprises 40 to 65% by volume of at least one of foam particles and fibrous particles and 35 to 60% by volume of aluminum.