JPH11117215A - Snow-melting panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the same snow-melting effect as the case in which the expensive radiating plate is used, even if it is not used. SOLUTION: On the upper surface of a large base plate 11 having legs 3 on the underside thereof, heating pipes 10 are arranged, and covering the heating pipes 10, a surface layer material 6a of a stone material such as crushed stones is filled up on entire surface of the base plate, and is fixed by injecting an epoxy adhesive 6b. In the snow melting panel P constituted in such a way, since the heating pipes 10 are surrounded all around the enire circumferential surfaces thereof by both stone materials of high specific heat and accordingly high heat accumulating efficiency and an expoxy resin of high heat-insulating efficiency, heat is efficiency conducted to the surface of the panel. On the other hand, in the panel equipped with a heat-radiating plate, the heat-radiating plate is in a line contact state with the heating pipe, and the heat-transfer efficiency is worse so much, so that the panel P of the embodiments, even if it is not equipped with a heat-radiating plate, produces the same snow-molting effect as the panel provided with the heat-radiating plate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a panel used for melting snow, for example, in a parking lot, on a garage side road, or on a sidewalk at an entrance.

[0002]

2. Description of the Related Art Various types of snow melting panels of this kind have been proposed in the past, for example, Japanese Utility Model Laid-Open No. 2-5420, Japanese Utility Model Laid-Open No. 3-54806, and Japanese Patent Laid-Open No. 6-264.
408 and JP-A-7-55167.

Many of the disclosed technologies are described in, for example, FIG.
As shown in FIG. 1, a heat transfer tube 10 through which a heat medium flows is disposed on a plate-like heat insulating material 21 such as urethane foam, and a heat radiating plate 12 is fixed to the surface thereof.

[0004]

What is important in the performance of such a snow melting panel P is how to effectively transfer heat from the heat medium to the radiator plate without absorbing the heat to the ground. It is. Here, heat transfer is radiation (radiation), conduction,
Made by convection, prior art insulation is prima facie in all of them.

[0005] However, even if it is a heat insulating material, it does not mean that there is no heat conduction. At the start of heat transfer, a considerable amount of heat is conducted to the low-temperature side ground due to a temperature difference.

Further, since a heavy load such as a person or a car is applied to the snow-melting panel, strength in the thickness direction (pressure resistance) is required. In order to obtain this strength with a heat insulating material, the heat insulating material is originally an elastic material, and therefore has a small compressive strength and tends to bend, and if bent, the heat insulating property is reduced due to a decrease in thickness. Regarding this point, Japanese Patent Application Laid-Open No. 7-55167 discloses that a heat radiating plate (frame) has strength in a thickness direction.
The plane shape is shown as a lattice, and a heat transfer tube is arranged in the lattice.In this case, the upper surface that performs the snow-melting action contributes only to the upper end surface of the lattice-shaped heat sink. The efficiency of its snow melting action is poor.

[0007] In order to increase the compressive strength, there is an insulating material having elasticity by interposing an elastic chip in the heat insulating material.
The chips make the heat insulating material porous, so that the water from the snow melting easily permeates into the heat insulating material.Water has a high thermal conductivity, which degrades the heat insulating performance of the heat insulating material and reduces the amount of heat radiated to the ground side. More.

Therefore, a snow melting panel with high snow melting efficiency is required. Even if improvements are made in accordance with the demand, the above description relates to a structure on the premise of disposing a heat sink.

[0009] However, as a material having excellent heat dissipation efficiency, for example, copper, copper alloy,
It is necessary to use zinc steel or the like, which is expensive and very expensive to manufacture.

In view of the foregoing, an object of the present invention is to provide a snow melting panel which does not use a heat radiating plate and has the same snow melting efficiency as the case where there is, without a heat radiating plate, in consideration of a reduction in manufacturing cost. I do.

[0011]

According to a first aspect of the present invention, a heating element is provided on an upper surface of a resin substrate having legs formed on a lower surface, and the heating element is covered. It proposes a snow melting panel in which a stone material such as silica sand is filled on the entire upper surface of the substrate, and these are fixed with a resin adhesive.

In the snow melting panel having such a structure, the substrate is made of a resin and thus has heat insulation. The portion surrounded by the legs on the lower surface becomes a space, and the space (air) has a very high heat-shielding property. The heat of the heating element disposed at the bottom is hard to flow to the ground side.

[0013] The surface layer surrounding the heat transfer tube is made of a stone material having a large specific heat, which is solidified with a resin adhesive having a large heat insulating property, so that the heat storage efficiency is high. The heat transfer tube covered over the whole surface,
The heat is efficiently transmitted to the panel surface. On the other hand, a panel having a heat sink, for example, those shown in FIGS.
The heat sink is in line contact with the top surface of the heat transfer tube,
Poor heat transfer efficiency.

Therefore, the panel in which the heat transfer tubes are surrounded by the surface layer has the same heat transfer effect as the panel provided with the heat radiator even without the heat radiator (see the graph of FIG. 9).

In the above structure, a plurality of holes may be formed in the substrate so as to penetrate the substrate in the thickness direction (claim 2). Since the liquid flows downward from the hole through the internal gap and below the substrate, drainage of the panel is improved.

[0016]

1 and 2 show a unit substrate 1 constituting a snow melting panel according to this embodiment. The substrate 1 is square, for example, 300 mm in length and width, and has a plurality of diamond-shaped holes 4 formed in the plate surface. A plurality of cylindrical projections 2 for fixing the heat transfer tubes are provided at a predetermined pitch on the upper surface of the substrate 1, and each projection 2 is formed with a bolt hole 2 a having a predetermined depth from the upper surface. Also,
On the lower surface of the substrate 1, cylindrical legs 3 are provided at a predetermined pitch.

The substrate 1 formed integrally with the projections 2 and the legs 3 is a resin molded product such as polypropylene (PP) or polyethylene (PE), and a fiber reinforced plastic such as FRP may be employed.

The substrate 1 of such a unit is, for example, as shown in FIG.
As shown in the figure, a total of 18 horizontal 3 rows and 6 vertical rows are combined to form a large-sized substrate 11 of 900 mm × 1800 mm. On the upper surface of the large substrate 11, sewing is performed between the protrusions 2, for example, As shown by the dashed line, a heat transfer tube 10 made of copper is provided. As shown in FIG. 4, a holding plate 5 for fixing the heat transfer tube 10 to the large substrate 11 is mounted on the upper surface of the heat transfer tube 10, and the holding plate 5 is provided with a screw hole 2a of the protrusion 2 near the holding plate. And the heat transfer tube 10 is fixed by screws (screw 16b).

Then, as shown in FIG. 4, the pressing plate 5 and the heat transfer tube 10 are covered, and the entire upper surface of the large substrate 11 is filled with a granular stone material such as recycled stone or crushed stone as a surface layer material 6a. 6b, for example, an epoxy-based adhesive is injected and fixed to form the surface layer 6, and a large-area snow melting panel P
To form The filling of the surface layer material 6a and the injection of the adhesive 6b are performed both before placing the holding plate 5 of the heat transfer tube 10 and after placing and fixing.

In FIG. 4, the surface layer 6 is manufactured at a position indicated by a dashed line in the horizontal direction, that is, a layered portion up to the upper surface of the holding plate 5 of the heat transfer tube 10 at a factory. The upper surface layer 6 (indicated by an arrow pointing upward from the one-dot chain line in the figure) is used for the laying work (connection between the large substrates 11 and heat transfer tubes 10) at the site where the panel P is laid.
At the same time. At that time, in order to make the appearance of the surface layer 6 look natural, natural stone is mixed as the stone material of the surface layer material 6a in addition to the recycled stone and the crushed stone.

As shown in FIG. 5, hot water is sent from the hot water boiler Q to the heat transfer tube 10 via the header D, and radiated from the surface layer 6 to melt snow. The snowmelt flows on the surface of the surface layer 6, but when the surface is constructed so as to have a downward gradient toward the edge of the laying surface, the flow becomes smooth. Also, in this embodiment, as shown in FIG. 1, the substrate 1 has a plurality of holes 4, 4,.
, Flows downward from the hole 4 to the lower side of the substrate 1, and the drainage of the panel P is good. In FIG. 4, since the surface layer 6 is schematically drawn, it seems that the surface layer 6 is densely packed, but there are actually gaps.

The snowmelt water forms a discharge groove around the laying area of the panel P, and is guided to the underground drain pipe through the groove as shown by a chain line in FIG. Since the resin expands and contracts due to the supply of hot water, a gap is preferably formed between the substrates 1 to absorb the expansion and contraction.

The configuration of the snow melting panel P of this embodiment has been described above. Next, the snow melting panel P without such a heat sink will be described.
Shows that there is an equivalent snow melting effect as compared with a snow melting panel having a heat sink. Therefore, first, the configuration of a snow melting panel of a comparative example having the heat radiating plate will be described with reference to the drawings.

As shown in FIG. 6, a substrate 51 is provided with a grid-like rib 14 running vertically and horizontally in a rectangular holding frame 13. Has strength in the thickness direction. A screw base 16 for fixing the heat radiating plate 12 is provided on a side wall of some of the ribs 14. The substrate 51 is a resin molded product such as polypropylene (PP) or polyethylene (PE), similarly to the large substrate 11 of the embodiment.

The heat transfer tube 10 is provided in the holding frame 13 so as to be restrained by the rib 14. That is, as shown in FIG. 6, the ribs 14 at the positions where the heat transfer tubes 10 intersect have the wall surfaces thereof cut out, and
5, the heat transfer tube 10 is fitted in the groove 15 as shown in FIG. 7, and when the heat radiating plate 12 is placed on the upper surface of the holding frame, the holding frame is closed. 13. At this time, the depth of the disposition groove 15 is set to be slightly shallower than the outer diameter of the heat transfer tube 10 as shown in FIG.
In a state where the heat transfer tube 10 is simply provided in the groove 15, the upper surface of the heat transfer tube 10 is slightly raised from the upper surface of the rib 14 or the holding frame 13, and the heat radiating plate 12 is moved to the holding frame 13 (rib 14). When the heat transfer tube 10 is fixed on the upper surface by screwing a bolt 16 b into a screw stand 16 on the rib side wall and fixing the heat sink 12 to the heat sink 12, the heat transfer tube 10 and the groove 15 are pressed against each other. It has become. The tube shape (outer diameter, wall thickness) of the heat transfer tube 10 is the same as that of the embodiment of the present invention, and the material is the same copper. The heat radiating plate 12 is formed of a zinc steel plate, and a surface material 17 such as rubber is adhered to the upper surface of the heat radiating plate 12 through an adhesive as shown by a dashed line in FIG. 17a is a ridge for preventing slippage.

The snow melting panel Pc with such a heat sink
And the snow melting panel P without a heat sink of the embodiment has the same area on the upper surface of the large substrate 11 (for example, 9
The heat transfer tubes 10 were arranged in the same place at the same time and at the same time, and their snow melting effects were observed. The result is shown in FIG.
Is shown in the graph.

In the graph of the figure, the horizontal axis indicates elapsed time, and the vertical axis indicates temperature. In the graph, the temperature of the panel surface and the temperature of the ground surface of the panel according to the embodiment of the present invention, respectively, are as follows. The temperature on the panel surface and the temperature on the ground surface of the panel in the comparative example respectively indicate the temperature of the outside air.

The graph shows the difference between the panel surface temperature of the embodiment shown by the graph, the panel surface temperature of the comparative example shown by the graph, and the panel ground surface temperature of the comparative example shown by the graph. It can be understood that the same snow melting effect can be obtained without the heat sink 12.

This means that the stone is contained in the surface layer 6, and the stone has a large specific heat and therefore a large heat storage effect. Therefore, such a stone is transferred together with the epoxy resin adhesive 16b having a high heat insulating property. Since the heat pipe 10 is densely surrounded over the entire peripheral surface, heat is efficiently transmitted to the panel surface, and the heat radiating plate 12 of the panel Pc of the comparative example emits heat positively. Since the heat transfer tube 10 is in line contact with the heat transfer tube 10 and the heat transfer efficiency from the heat transfer tube 10 is correspondingly poor, the panel Pc of the comparative example having such a configuration is used.
The panel P of this embodiment having the surface layer 6 formed as described above has the same area as the upper surface of the substrate and the same overall length of the heat transfer tube 10 to provide the same heat insulating performance. Become.

In this embodiment, a large-area snow melting panel P is formed by combining a large number of substrates 1, but a small-area combined substrate is formed by reducing the number of substrates 1 to be combined, and the above-mentioned If a small-area snow-melting panel Ue provided with a small-sized electric heating tube 10e is formed instead of the heat-transfer tube 10 for a large-area snow-melting panel, for example, FIG.
It may be installed in a narrow place such as the stairs S as shown in FIG.

[0031]

According to the present invention, as described above, it is possible to obtain a panel having excellent heat insulating properties, energy saving and a smooth snow melting action without using an expensive heat sink.

[Brief description of the drawings]

FIG. 1 is a plan view of a unit substrate constituting an embodiment.

FIG. 2 is a side view of a unit substrate constituting the embodiment;

FIG. 3 is a plan view of a large substrate having a heat transfer tube disposed on an upper surface.

FIG. 4 is a side view showing a fixed specification of the heat transfer tube.

FIG. 5 is a piping diagram of laying snow melting panels.

FIG. 6 is a partial perspective view of a comparative example.

FIG. 7 is a partial perspective view of a comparative example.

FIG. 8 is a sectional view of a main part of a comparative example.

FIG. 9 is a thermal insulation characteristic diagram.

FIG. 10 is a diagram showing an application example of the embodiment;

FIG. 11 is a sectional view of a main part of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Substrate 2 Protrusion 3 Leg 4 Hole 5 Holding plate 6 Surface layer 6a Surface layer material 6b Adhesive 10 Heat transfer tube 11 Large substrate 12 Heat sink 13 Holding frame 14 Rib 15 Arrangement groove

Claims (2)

[Claims] 1. A heating element is disposed on an upper surface of a resin substrate having legs formed on a lower surface, and a stone material such as silica sand is filled over the entire upper surface of the substrate so as to cover the heating element, and these are bonded by resin. A snowmelt panel fixed with an agent. 2. The snow melting panel according to claim 1, wherein a plurality of holes are opened in the substrate in a thickness direction thereof.