JPH10294167A - Surface under layer executing heating plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure strength of a heating plate, and radiate far infrared radiation in large quantities from a lump of carbon by forming carbon powder as a densely contacting heating plate by performing pressurizing molding on the carbon powder, embedding current-carrying wires as both electrodes having plural branch wires on it in both end parts, and alternately tangling the branch wires with each other. SOLUTION: One sheet 15 is laid at the bottom of a lower mold, and after carbon powder is filled on it, conductive electric wires 3 and 5 having branch wires 7 and 9 are arranged in the next place, and carbon powder and also the other sheet 15 are laid on it, and are pressed by an upper mold. When its pressurizing force is set to about 50 atmospheric pressure, it is converted into a hard surface under layer executing heating plate P stable in strength. This is arranged on a hardened backing, and connecting terminals 11 and 13 are arranged so as to be connected to each other, and its surface is paved with asphalt or the like. Then, when an electric current is carried at snowfall time, since heat reserving performance of a heating plate is excellent, snow can be efficiently extinguished. Since it is stable in strength, it can easily endure an earthquake and traffic impact.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating plate for underlayer construction, which is laid under a pavement material, a roofing material, or the like to prevent snow accumulation, or laid under a floor as floor heating.

[0002]

2. Description of the Related Art Conventionally, snow melting devices on roads, gardens, etc.
Many are sprinkled. In addition, as a snow melting device and floor heating, by burying a heating tube through which heat medium such as hot water passes,
The thing by burying a heating element by energization is adopted.
In this case, the heating element is a plate-shaped heating element (Japanese Patent Laid-Open No. 62-1987).
No. 291886), a linear heating element (JP-A-7-3316).
No. 05), a sheet-like heating element or the like is used.

[0003] The above-mentioned plate-shaped heating element is made by dispersing carbon fiber or carbon black as a conductive filler in an inorganic material obtained by mixing an aggregate such as silica sand or coal ash with cement. For this purpose, electrode plates are bonded to both end surfaces of the plate. Further, carbon fibers and carbon black are coated with a conductive resin in order to prevent oxidation.

However, even if a conductive filler is dispersed in a coarse cement material having a high electric resistance value, the contact, that is, the conductivity is imperfect, so that it is difficult to practically generate heat. In addition, there is also a problem that when a crack is generated between the two electrodes due to an earthquake or traffic impact, the current is interrupted there.

[0005]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the plate-like heating element, and ensures the conductivity, ensures that cracks are unlikely to occur, and cuts off electricity even if it occurs. The purpose of the present invention was to provide a heating plate for the underlayer construction without any surface.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention is to form a heat generating plate using carbon powder as a main material by applying high pressure to make close contact with the carbon powder. A heating plate for undersurface layer construction, characterized in that conducting wires as both electrodes each having a plurality of branch lines are buried in parallel at both ends, and the branch lines of both electrodes are alternately interleaved and arranged. Is provided.

[0007] Since the heat generating plate for the undersurface layer is constructed as described above, good conductivity can be obtained by the close contact of the carbon powder and the braided wire, and at the same time, the strength of the heat generating plate is ensured. You. Further, since it is a mass of carbon, it emits a large amount of far infrared rays.

[0008] When the connecting material and / or carbon fiber is mixed into the carbon powder, the strength and the conductivity are improved even if the degree of pressurization in molding is small.

Further, when the sheets are bonded to both sides of the heating plate, the carbon powder is prevented from being oxidized, and the strength of the heating plate is stabilized.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION As carbon powder used in the present invention, charcoal and coal powder and powder obtained by steaming household waste are suitable for use because they are inexpensive. Black carbon in a narrow sense, which is obtained by treating a petroleum product or the like at a high temperature of about 1100 ° C., is suitable for use because of its stable conductivity.

The carbon powder is amorphous carbon, but is a single crystal like graphite. The difference from graphite is that the single crystal is extremely small and incomplete. When carbon is heated at a high temperature, the atoms approach a stable graphite crystal arrangement, and a single crystal gradually grows, and the specific gravity, electric resistance, hardness and the like change to approach the value of graphite. Therefore, when carbon powder using charcoal or domestic waste is used, it is desirable to apply high heat simultaneously with pressurization to perform such denaturation.

[0012] Since the deterioration of carbon is promoted by such a high temperature, the pressing force can be reduced by heating the mold to, for example, 300 ° C to 600 ° C. In this case, if the sheet 15 is paper, it burns at a high temperature, so a non-combustible sheet, for example, a woven fabric made of carbon fiber, a heat-resistant resin sheet, or the like is used. Further, after the heating plate 2 is formed, the sheets 15, 15 are formed.
May be pasted.

As the connecting material, epoxy, phenol, urethane, silicone, polyester, polyimide, etc. are suitable for use as synthetic polymers (resins). In some cases, diluents or solvents for changing workability and viscosity are used. Further, additives may be mixed in to improve the dispersibility of the carbon powder.

When pressed, the connecting material hardens and shrinks, and the carbon powder comes into contact with the material, thereby providing conductivity. If the degree of pressurization is small, conductivity cannot be obtained. Ensuring conductivity is affected by the type and properties of the carbon powder, the degree of pressurization, and the like. When a conductive adhesive is used for the connecting material, conductivity can be easily obtained even with a small degree of pressure. When carbon fibers are mixed, the strength and conductivity are improved.

The conductive adhesive comprises a conductive filler, a synthetic resin, a curing agent, an additive and the like. As the synthetic resin, the above-mentioned epoxy resin, phenol resin or the like is used. In addition, as the conductive filler, gold, platinum, silver,
Metal powders such as copper and nickel, zinc oxide, indium oxide,
Powders of metal oxides such as tin oxide, carbon black and graphite are used.

Sheets 15 and 1 attached to both sides of heating plate 2
Numeral 5 functions to improve the strength of the heat generating plate 2, prevent oxidation of the carbon powder, and waterproof. The material is selected depending on which of these functions is to be emphasized and on the difference in the manufacturing method. As the material, paper, non-woven fabric, woven fabric, synthetic resin sheet and the like are used.

In the heating plate 2, the branch lines 7 and 9 of the conducting wires 3 and 5 are alternately inserted and, so to speak, are hardened, so that the strength is also improved and a crack is temporarily formed in the heating plate 2. Even if it enters, conductivity is ensured. Any material may be used for these wires as long as they have conductivity, but copper wires are most suitable.

[0018]

As described above, according to the heating plate for undersurface layer construction of the present invention, the conductivity is ensured reliably and cracks are unlikely to occur. It is easy to use and can be stably used for a long time in snow melting equipment and floor heating, etc. In addition, since it is a lump of carbon, there is an excellent effect that it has the effect of snow removal and heating by far infrared rays.

[0019]

FIG. 1 is an exploded view of a heat generating plate P for undersurface layer construction according to the present invention. A heat generating plate 2 made of carbon powder has a rectangular plate shape (1,500 mm long, 1,500 mm wide). , 150 mm thick), and energized wires 3, 5 of the two poles are buried in parallel at both left and right ends, and each of the energized wires 3, 5 has a plurality toward the other side, in this case two by two. Branch lines 7, 9 are alternately extended. At both ends, connection terminals 11 and 13 of the conducting wires 3 and 5 are protruded. Further, sheets 15, 15 are attached to both surfaces of the heating plate 2.

For production, one sheet 15 is laid on the bottom of a lower die assembled in a box shape, and about half the amount of charcoal powder is filled thereon as a carbon powder. The electric wires 3 and 5 are arranged, and then the remaining carbon powder is filled. Then, the other sheet 15 is laid thereon and pressed with an upper die. By changing the pressure to about 50 atm, the plate was transformed into a hard plate that was stable in strength. Energizing wires 3, 5 and branch wires 7,
Copper wire was used for 9 and paper was used for sheets 15 and 15.

In another embodiment, about 5% of a powder of polyester or the like is mixed into carbon powder, and once melted by heat generated by pressurization or heating of a mold, the powder acts as a connecting material. I let it. At this time, by mixing about 1% of carbon fibers, the strength of the heat generating plate 2 can be further increased.

In the case of pavement, the foundation 17 made of a mixture of gravel and silica sand is hardened, and the heating plates P, P,.
, And connecting the connection terminals 11 and 13,
A thermostat is partially provided, and the pavement 20 is formed by asphalt or the like on the arrangement of the heat generating plates P for underlayer construction. Thus, when electricity is turned on during snowfall, the heat retention of the heat generating plate 2 is good, so that the snow is efficiently removed. In addition, since the strength is stable, it is easy to withstand earthquakes and traffic shocks.
The ability of snow removal is adjusted by the voltage.

[Brief description of the drawings]

FIG. 1 is a cutaway perspective view showing a heat generating plate for undersurface layer construction according to the present invention.

FIG. 2 is a cross-sectional perspective view of pavement showing an example of use of the same lower layer construction heating plate.

[Explanation of symbols]

 Heating plate for P-layer lower layer construction 2 Heating plate 3,5 Conducting wire 7,9 Branch wire 15 Sheet

Claims (3)

[Claims] 1. A heating plate which is made of carbon powder as a main material and which is in close contact with carbon powder by applying a high pressure is formed. A heat generating plate for undersurface layer construction, wherein the heat generating plate is buried in parallel to the substrate and arranged such that branch lines of both electrodes are alternately interwoven. 2. The heating plate for undersurface layer construction according to claim 1, wherein a connecting material and / or carbon fiber is mixed in the carbon powder. 3. The heat generating plate for under-layer construction according to claim 1, wherein sheets are bonded to both surfaces of the heat generating plate.