JP2584553Y2 - Road surface cooling equipment - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for cooling an asphalt-paved road surface through a heat pipe.

[0002]

2. Description of the Related Art A general road on which a vehicle passes has a structure in which a roadbed is formed on a hearth, and asphalt and concrete pavements are further provided thereon. Is normal. This asphalt pavement is composed of a surface layer and a base layer mainly composed of a heated asphalt mixture, the surface layer functions to prevent abrasion and shearing by traffic vehicles, and also functions to prevent penetration of rainwater, and the base layer joins the surface layer It functions to transmit the load evenly to the roadbed.

[0003]

The above-mentioned asphalt pavement is softened by an increase in temperature due to the properties of the material. Therefore, when there is a large amount of solar radiation in the summer, etc., and when the temperature is high, the temperature of the road surface becomes considerably high due to solar heat and heat generated by friction with the wheels. May soften. In such a case, there is a problem that a rut is formed on the road and the road must be repaired frequently.

[0004] The present invention has been made in view of the above circumstances, to prevent the rise of the road surface temperature and to reduce the occurrence of rut,
It is another object of the present invention to provide a road surface cooling system that can extend the life of a road.

[0005]

According to the present invention, in order to achieve the above object, one end of a heat pipe is buried along a running direction of a wheel below a main wheel contact portion of an asphalt-paved road surface. And the other end of the heat pipe is arranged at a cooling position higher than the one end , and the heat pipe is shared with a working fluid.
Variable conductance type with a small amount of non-condensable gas filled in
Characterized in that it is a heat pipe .

[0006]

[Function] The temperature of the asphalt-paved road surface is increased by solar heat or heat due to friction with wheels, and when the temperature is higher than the temperature of the cooling point, the portion of the heat pipe buried under the road surface. Becomes an evaporating section, and an end disposed at a cooling location becomes a condensing section. That is, the working fluid in the heat pipe evaporates in a portion directly below the road surface due to heat transmitted from the road surface, and the steam flows to the end on the cooling point side to radiate and condense. To cool the road. Since the end on the cooling point side where the working fluid condenses is located higher than the end buried below the road surface, the condensed working fluid smoothly returns to the evaporating section side. Therefore, since the rise in the road surface temperature is suppressed, the asphalt pavement hardly becomes soft enough to withstand the weight of the vehicle or the shearing force of the wheels, and the rut hardly occurs . Note that the heat pipes are
Variable condenser that adjusts heat transfer capacity by itself according to temperature difference
Because it is a ductance type heat pipe,
Necessary or excessive cooling does not occur.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the accompanying drawings. FIGS. 1 to 3 are schematic views showing an embodiment configured to be air-cooled. A road surface 3 is formed by asphalt pavement on the road 2, and one end of a heat pipe 5 is embedded in a portion of the road surface 3 where a rut easily occurs, that is, below a main wheel grounding portion 4 . This heat pipe 5
A condensable fluid such as Freon is placed inside the sealed tube
At the same time, a small amount of non-condensable gas such as nitrogen gas
This is a sealed variable conductance type heat pipe. Ma
If necessary, a wick is installed inside the container.
ing. In the lower side of the front SL wheel vertical portion 4 are embedded along the traveling direction of the vehicle as shown in FIG. In addition, as an example, as shown in FIG.
The boundary between the roadbed 7 provided on the hearth 6 and the asphalt pavement 8 is preferable. The other end of the heat pipe 5
It protrudes into the atmosphere at the part of the median strip 1 and protrudes into the atmosphere from the heat pipe 5 and the slope 9 on the opposite side and rises upward, so that these ends are on the road surface 3. It is located at a position higher than the end buried below, and radiates heat to the atmosphere by attaching fins 10. That is, in this embodiment, the atmosphere is the cooling location.

The temperature of the road surface 3 rises due to solar heat or frictional heat with the wheels. If the temperature rises to a certain extent, a temperature difference occurs at both ends of the heat pipe 5, so that the heat pipe 5 carries out heat transport. That is, when the temperature of the wheel contact portion 4 becomes higher than the atmospheric temperature to some extent, one end of the heat pipe 5 buried under the wheel contact portion 4
The fin 10 is heated by the heat from the fin 10 and becomes an evaporator. On the other hand, the end on which the fins 10 in the atmosphere are attached becomes a cooler condenser. When heat is transferred from the road surface 3 to the evaporating section, the working fluid evaporates here, and the vapor flows to the low-pressure condensing section, where it releases heat to the atmosphere and condenses. The condensed working fluid is returned to the evaporator by gravity or the pressure of the wick and the capillary, and is heated again to evaporate. In this manner, the heat pipe 5 carries the heat of the wheel grounding portion 4 into the atmosphere and emits it, so that the wheel grounding portion 4 is substantially forcedly cooled by air, and the temperature rise is suppressed. As a result, according to the above-mentioned cooling equipment, since the wheel grounding portion 4 does not become particularly soft, the occurrence of a rut is prevented . In addition, as a heat pipe 5, a wheel grounding portion
4 (road surface 3) and the heat transfer capacity according to the temperature difference between the atmosphere
Adopts a variable conductance heat pipe that adjusts itself
Of the condensing section until cooling is necessary.
The heat is suppressed, and unnecessary cooling of the wheel contact part 4 (road surface 3) is unnecessary.
Can be prevented.

FIGS. 4 and 5 are schematic views showing another embodiment of the present invention, in which the side groove 11 provided along the roadway 2 is used as a cooling point. That is, one end of the heat pipe 5 is buried under the wheel contact portion 4 of the road 2, and the other end is disposed in the side groove 11 at a position higher than the one end. . There is always running water in this gutter 11 or it is shaded by a lid. Therefore, as the heat pipe 5, a portion buried under the wheel grounding portion 4 is an evaporating portion that receives heat from the road surface 3 side. The end on the side of the side groove 11 is a condensing portion that is cooled by water or air.

In the example shown in FIGS. 4 and 5, when the temperature of the road surface 3 rises in summer or the like, the temperature in the side groove 11 is relatively low. As a result, the wheel contact portion 4 of the road surface 3 is cooled and its softening is prevented. Also, the working fluid condensed at the end of the heat pipe 5 on the side of the side groove 11 smoothly returns to the other end, which is the evaporator, because this end is at a high position.

FIG. 6 is a system diagram showing still another embodiment of the present invention. The embodiment shown here is configured to perform forced water cooling. That is, the other end of the heat pipe 5 having one end buried under the wheel grounding portion 4 is inserted into a U-shaped portion of a U-shaped header tube 12 connected in series with each other. The U-shaped header tube 12 is connected to a chilled water circulation path 15 in which a circulation pump 13 and a radiator 14 are interposed. The radiator 14 may be of a type that dissipates heat into the atmosphere by means of a large number of fins, a cooling tower type that disperses water in an air flow, or a type that cools down as another refrigerant. Can be. The U-shaped header tube 12 is provided at a position higher than the end of the heat pipe 5 buried under the road surface 3.

Therefore, in the example shown in FIG. 6, if cold water is allowed to flow through the U-shaped header tube 12 when the temperature of the road surface 3 rises, the U-shaped header tube 12 becomes a cooling point and the heat pipe 5 heats the road surface 3. To cold water, and as a result, the road surface 3 is cooled. In this case, if the cold water cooled by the radiator 14 is continuously supplied to the U-shaped header pipe 12 by the circulation pump 13, the road surface 3 can be continuously cooled, and if the circulation of the cold water is stopped, Since the cooling of the road surface 3 stops,
The cooling of the road surface 3 can be selectively performed. Also in the example shown in FIG. 6, the working fluid condensed on the U-shaped header tube 12 side is smoothly returned to the evaporating section side because this portion is high.

[0013]

In each of the above embodiments, the heat pipes are buried in a row for each of the wheel grounding portions 4. However, since the wheel grounding portions 4 have a certain width, the heat pipes may be buried in a plurality of rows. Good. If necessary, one end of the heat pipe may be buried under another portion of the road surface 3.

[0015]

[Effect of the Invention] As is clear from the above description, according to the road surface cooling system of the present invention, the main wheel ground contact portion can be changed by the variable control.
Was cooled through a conductance type human Topaipu, it is possible to suppress the temperature rise, the occurrence of ruts by asphalt pavement of the road surface is not softened is prevented, achieving a cost reduction of maintenance costs and long rehabilitation period and thus the road be able to.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing an embodiment of the present invention.

FIG. 2 is a schematic plan view thereof.

FIG. 3 is a cross-sectional view showing the state of burying a heat pipe.

FIG. 4 is a schematic plan view showing another embodiment of the present invention.

FIG. 5 is a sectional view thereof.

FIG. 6 is a system diagram showing still another embodiment of the present invention.

[Explanation of symbols]

2: Roadway, 3: Road surface, 4: Wheel contact part, 5: Heat pipe, 11: Gutter, 12: U-shaped header tube.

Claims (1)

(57) [Scope of request for utility model registration] An end of a heat pipe is buried along a running direction of a wheel below a main wheel ground contact portion of an asphalt-paved road surface, and the other end of the heat pipe is connected to the one end. Located at a higher cooling point , and wherein the heat pipe is
Variable conductance type filled with a small amount of non-condensable gas
Road surface cooling equipment characterized by a heat pipe .