JP2588357B2 - Heat storage and heat dissipation device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat storage / radiation device having a function of preventing dew condensation, freezing, and snow accumulation on a reflector or a sign used outdoors, which is likely to occur in cold weather.

[0002]

2. Description of the Related Art Road reflectors, car side mirrors, signs and the like are traffic safety devices. However, during cold seasons from autumn to spring, mirrors and signs are not useful due to condensation, freezing and snow accretion. Therefore, a solution is strongly desired.

[0003] The main causes of condensation, freezing, and snow accretion on the mirror surface or the sign surface from the night of cold weather to the morning are as follows.
In the period from the evening temperature drop cycle to the early morning temperature rise cycle, the mirror surface and signs become lower than the dew point temperature, causing dew condensation, ice particles, and snow. Therefore, to prevent this, the temperature of the mirror surface or the sign surface may be set to be as high as possible than the ambient temperature.

Japanese Utility Model Application Publication No.
In JP-A-198901 and JP-A-4-97004, it is proposed to form a latent heat storage layer between mirror surfaces of reflectors, but the temperature varies greatly depending on each region and time in the whole country.
Therefore, a device using a latent heat storage layer that generates latent heat only at a specific temperature does not always work well throughout the year. The use of sensible heat storage is more suitable for raising the effect in such a large difference in temperature.

[0005]

Within a certain temperature, even if the heat storage amount is 3 to 4 times the sensible heat storage, about 10% or less of water in other temperature ranges, especially in a temperature range of 0 ° C. or less. Is not suitable as a heat storage agent for reflectors or signs used in various parts of the country. Although it is a good method to form the heat storage layer between the mirror surface and the back plate, the effect is greatly reduced because heat is radiated more than the back surface direction unless a heat insulating material is provided on the back plate side.

In Japanese Patent Application Laid-Open No. 2-204508, a container containing a liquid heat storage agent is installed on the mirror surface side between a road reflection mirror surface plate and a back plate, and a heat insulating material is arranged on the back plate side, so that it can be used during daytime. It has been proposed to collect heat from a mirror surface during a time when the outside air temperature is high, and when the outside air temperature decreases from night to early morning, the mirror surface is warmed more than the heat storage agent and the mirror surface temperature is kept higher than the temperature near the outside air.

The problem with this method is that when the outside air temperature rises early in the morning, the liquid heat storage agent convects, and the temperature of the heat storage agent rises in the upper part and rises considerably later in the lower part. For this reason, even if the outside temperature starts rising at the lower part of the mirror surface, the temperature rise at the lower part of the heat storage agent is delayed because the temperature rise at the lower part of the heat storage agent is delayed, during which time the mirror surface may be lower than the outside temperature and the mirror surface may become cloudy. is there. Furthermore, when the outside air temperature decreases from night to early morning, the internal heat storage agent convects, heat dissipation of the heat storage agent is promoted, and the heat storage effect decreases.

In Japanese Patent Application Laid-Open No. 5-25808, 1-5% of a superabsorbent resin is added to a liquid mixture of water such as polyethylene glycol and water on the back of a signboard of a road sign to form a swelling gel and sponge. It has been proposed to use a heat storage agent impregnated and placed in a container.

In this method, the decrease in efficiency due to the convection of the heat storage agent is eliminated. However, when only heat collection into the heat storage agent and heat conduction of heat radiation from the heat storage agent are performed,
It is not a sufficiently efficient method as long as a liquid heat storage agent having a heat conduction speed one-half lower is used. For this reason, even if the amount of the heat storage agent is increased, the effect stops at a maximum because the conduction speed of heat collection and radiation is low.

[0010] As described above, the techniques proposed in the past have not been sufficiently functional under a wide range of weather conditions.

[0011] The present invention relates to the use of outdoors, mirrors or signs of road mirrors and side mirrors for traffic safety for traffic safety, or dew condensation on the surface temperature of the sign becomes lower than the temperature of the surrounding air due to radiant cooling. I do. An object of the present invention is to provide a side mirror or a sign of such a road reflector vehicle with a function of effectively preventing condensation, freezing and snow accumulation from a cycle of decreasing the temperature to a cycle of increasing the temperature.

[0012]

SUMMARY OF THE INVENTION The present invention has been made to solve these problems, and a far-infrared radiator is added to and blended with a mirror surface made of a metal plate or a back surface of a display surface of a sign. A gel-type heat storage agent is installed so that heat can be propagated,
Next, a heat insulating material is disposed in close contact, and the metal plate, the heat storage agent, the reflector, the heat insulating material, and the back plate are integrated with each other, or heat is transmitted to the back surface of the metal plate so that a small amount of leakage is reduced. This is achieved by installing a container containing a heat storage agent, then placing a reflector, and then a heat insulating material in close contact, and further integrating them with a back plate.

The heat storage section is a main part of the present equipment. As the heat storage agent, it stores heat of sensible heat having a uniform specific heat within the operating temperature range, and a gel-like material is used as the property. . Further, a far-infrared radiator is blended into the heat storage agent of the present invention. That is, if the far-infrared radiator is blended, it is possible to store the energy collected by the metal plate in the heat storage agent with little delay in heat propagation. Also, when radiating heat from the heat storage agent to the metal plate, the radiator can efficiently radiate heat by radiating far-infrared rays.
Further, by using the gel-like heat storage agent, the heat storage agent becomes strong against vibration and the convection phenomenon is eliminated, so that the heat release effect of the heat storage agent is improved and the temperature unevenness of each part of the metal plate is reduced.

As the heat storage agent, an aqueous solution of ethylene glycol, propylene glycol, diethylene glycol or the like in a liquid state is used in a wide temperature range from about -50 ° C. to + 50 ° C.

The far-infrared radiator has a high emissivity in the normal temperature range, and the radiation wavelength region is appropriately mixed with ceramics, zirconia, titania, alumina, etc. so as to emit 3 to 10 microns in the absorption wavelength band of the heat storage agent. To use.

The gel heat storage agent containing the far-infrared radiator may be produced by any method. For example, a mixture of a commercially available superabsorbent resin and ceramics may be used to form a gel by using an appropriate amount, or 10% by weight of a water-soluble polymer may be dissolved, and then 0.5% by weight of a crosslinking agent may be added and mixed.

The far-infrared radiating portion may be one obtained by adding far-infrared ceramic powder to polyethylene and integrating it as a film. As the heat-conducting cushioning material, a material obtained by punching a highly foamed polyethylene foam into a net shape is preferable.
As the reflector, a laminate film of plastic and aluminum is preferable. As the heat insulating material, urethane foam, styrene foam, or the like is used.

[0018]

【Example】

Embodiment 1 An embodiment according to the present invention will be described in more detail. FIG.
FIG. 2 is a cross-sectional view when a heat collecting and radiating unit of the present invention is a road reflector. FIG. 2 is a perspective view in which a part of a container for storing a heat storage agent is cut away.

In FIG. 1, 1 is a mirror surface 1A having an appropriate curvature.
A mirror plate as a metal plate collecting and radiating part having a back plate which is integrally joined with a space for accommodating appropriate contents,
Reference numeral 3 denotes an eave provided to protrude above the mirror plate. In the present invention, the far-infrared radiating section 19 is inserted in contact with the inside of the mirror surface of the mirror plate 1. Next, a heat-conducting buffer material 38 is put in close contact with this. The container 4 is housed in close contact with the back, and the container 4
Is filled with a heat storage agent containing a far-infrared radiator, a heat insulating material 6A is provided in close contact with the back of the container 4 containing the heat storing agent, and a heat insulating material 6B is further provided between the heat insulating material 6A and the back plate 2 to reflect the light. The surface of the head plate 1 is configured to prevent condensation, freezing, and snow accumulation.

Reference numeral 7 denotes a mirror back plate fastening portion for integrally connecting the mirror plate 1 and the back plate 2 of the present invention, 8 denotes a support plate mounted on the back of the back plate 2, 9 denotes a connecting piece, and 10 denotes a mounting plate 8. A pivot for pivotally supporting the connecting piece 9; 11 a stopper for positioning between the support plate 8 and the connecting piece 9; 12 an arc-shaped long groove for fitting the stopper;
Is a column supporting the connecting piece 9, and 14 is its fastener. As a heat storage agent, it has a large amount of heat storage per volume over a wide temperature range from about -50 ° C to + 50 ° C, emits far-infrared rays of 3 to 10 microns without freezing and no toxicity at low temperatures, and for a long time. A stable gel heat storage agent is preferred.

It is also necessary to consider the compatibility between the heat storage agent and the container. In the present invention, in consideration of the above conditions, for example, when a mirror having a diameter of 800 mmφ is used, 2.5% of a superabsorbent resin mixed with a ceramic for far-infrared radiation is added to a liquid mixture of ethylene glycol and water, and Inject into 4 and use. The gel-like heat storage agent 5 is placed in the container 4 and attached between the heat-conducting buffer material 18 and the heat insulating material 6A. In the case of an 800 mmφ road reflector, the radius of curvature of the mirror surface is suitably 3000 mm.

With respect to this curvature of the mirror surface, it is desirable that the container 4 in which the heat storage agent 5 is placed is in close contact with the inner side 1B of the mirror plate 1 via the heat conduction buffer 18 and the far-infrared radiating portion 19.
It is desirable that the volume of the heat storage agent per unit area of the central portion and the outer peripheral portion of the mirror plate 1 be substantially the same. Further, as described above, since the operating temperature is between -50 ° C. and + 50 ° C., it is necessary that the container 4 is not damaged even when the heat storage agent 5 expands in volume, and the heat storage agent 5 does not dissipate outside. It is.
Further, the far-infrared ray radiated through the far-infrared radiating section by the thermal energy taken in from the heat collecting section is coupled to the heat storage agent with good heat propagation, so that the heat is efficiently stored without delay.

Considering these conditions, in the present invention, the container 4 is a round container using, for example, a three-layer film in which a polyethylene low-temperature sealing film, a polyethylene film and a polypropylene film are laminated.
However, the present invention is not limited to this. A container 4 for storing the heat storage agent is provided with a uniform liquid amount seal 1 on the film 2 at regular intervals so that the gel heat storage agent 5 has substantially the same volume over the entire mirror surface.
5. It is configured to suppress the see-through loss together with the outer peripheral seal 16. The container 4 is provided with an inlet 17 for receiving the heat storage agent 5.

A reflector 20 made of an aluminum laminated film is arranged on the back of the heat storage agent container. This reflector reflects far infrared rays. Insulation materials 6A and 6B are inserted between the reflector 20 and the back plate 2. The heat insulating materials 6A and 6B are, for example, 40
The two pieces of 800 mmφ and 200 mm × 400 mmφ bonded together are placed in a polyethylene film bag and waterproofed. During the daytime when the outside air temperature is high, more heat is collected from the mirror surface, transferred to the heat storage agent 5, and stored. When the outside temperature decreases from night to early morning, the far infrared rays emitted from the heat storage agent 5 are absorbed by the far infrared radiating portion behind the mirror surface,
The heat is transferred to the mirror surface plate 1 to warm the mirror surface 1A from the inside and keep the temperature higher than the ambient temperature of the outside air. In addition, by making the heat storage agent gel, the stored heat energy is released over a long period of time.

The sponge used as a heat insulating material is configured so that the heat storage agent container 4 is brought into close contact with the inside of the mirror surface 1B via the heat conductive buffer material by using the elasticity thereof, thereby serving as a buffer material.

FIG. 3 shows the result of a comparative test of the road reflector A according to the present invention and the road reflector B without the conventional anti-fog device.

As shown in FIG. 3, the observation for 10 days is 6
This is a graph in which the mirror surface temperature and its surrounding temperature are recorded at 1:30 and are graphed. The mirror surface temperature (A) of the present invention is the same as the conventional mirror surface temperature without the prevention function over the entire observation period. B) higher than ambient temperature (C). The conventional product (B) shows the same temperature as the ambient temperature (C).

Next, a road reflector according to the present invention will be described.
FIG. 4 shows the results of a comparative test of a road reflector with a fogging prevention device of the type proposed in JP-A-204508, hereinafter referred to as a conventional product (D).

FIG. 4 is a graph obtained by recording the temperature of the mirror surface and its surroundings for 24 hours, and plotting the temperature of the mirror surface according to the present invention.
It shows a high temperature at 10 o'clock. This is an effect due to the use of a gel-type heat storage agent containing a far-infrared radiator. During the time when the temperature rises, the heat energy of the outside air is taken in from the mirror surface of the reflector and transferred to the far-infrared radiating section behind the mirror surface. After the heat, it emits far-infrared rays, and is heat-transferred and stored in the heat storage agent via the heat-conducting buffer material. During the time when the temperature decreases, the far-infrared rays emitted from the heat storage agent are transferred to the far-infrared radiating section behind the mirror surface through the heat conduction buffer in a heat-propagating manner, and are further conducted to the mirror surface to heat the mirror surface. I do. By gelling the heat storage agent, the convection phenomenon is eliminated, and the use efficiency of the heat storage energy is improved. Further, the temperature difference between the upper and lower portions of the mirror surface is reduced. The mirror surface and the heat storage agent conduct heat transfer not by heat conduction but by far-infrared rays, so that a delay in heat transfer time can be eliminated, and a delay in temperature rise of the mirror surface when the temperature rises in the early morning can be eliminated. From the above comparative test results, the reflector according to the present invention shows an extremely effective fogging prevention effect.

Embodiment 2 Another embodiment of the present invention will be described in more detail.
FIG. 5 is a sectional view of a road sign according to the present invention. In FIG. 5, reference numeral 21 denotes a sign plate made of a metal plate having an appropriate thickness and an appropriate flat sign surface, and reference numeral 25 denotes a back plate integrally joined with a space for accommodating appropriate contents.

In the present invention, an external far-infrared radiator 36 is provided on the front of the sign board 21, a reflection sheet 35 is attached to the table, and an internal far-infrared radiator 37 is installed on the back of the sign board 21. A heat buffer material 38 is provided on the back, a container 23 for storing a heat storage agent is stored on the back, a heat storage agent 22 is filled in the container, and a reflector 34 is installed on the back of the heat storage agent-containing container 23, and the reflection is performed. Container 34
A heat insulating material 24 is provided between the
A is configured to prevent condensation, freezing, and snow accumulation on A.

Numeral 26 denotes a support fitting for connecting and supporting the sign board of the present invention to the connecting fitting 27, and its positioning alignment connection in the horizontal direction is performed.
This is performed by a positioning stopper 28. In order to install the sign board 21 on the upper part of the road, an arm fitting 29 protruding laterally from the pillar 30 is connected to a connecting fitting 27 of the sign board 21 by a fastener 31. The heat storage agent preferably has a large specific heat and a large amount of heat storage in a wide temperature range from about −50 ° C. to + 50 ° C., is liquid, emits far-infrared rays, is nontoxic, and has little deterioration over a long period of time. Also, it is necessary to sufficiently consider the compatibility between the heat storage agent and the container.

In the present invention, in consideration of the above conditions, for example, when a sign of 1.5 m × 2.0 m is used, the ceramic powder is added to the container 23 containing the heat storage agent in a liquid mixture of ethylene glycol and water. 1% to 5% of the added water-absorbing resin is added. When this resin is added, the mixed solution of ethylene glycol and water is absorbed and swells to form a gel.

The front of the sign board 21 has an external far-infrared radiator made by kneading ceramic powder into a polyethylene film.
36, and a high-brightness reflective sheet 35 of aluminum foil or the like is cut and pasted into a picture as a sign display character on the table.

On the back of the sign board 21, an internal far-infrared radiator 37 into which ceramic powder has been kneaded, a heat buffer material 38 is provided on the back thereof, and a container 23 for storing a heat storage agent is provided on the back thereof. A heat insulating material 24 is disposed on the back plate 25, and is combined with the back plate 25, and is housed in the housing by the support fitting 26.

The container 23 for storing the heat storage agent shown in FIG.
33 will be provided. A heat buffer material 38 is inserted between the sign board 21 and the container 23 for storing the heat storage agent 22. The thermal buffer 38 is, for example, 0.5 t
The foamed polyethylene is installed in a net shape. Insulation material 24 placed between the container 23 containing the heat storage agent 22 and the back plate 25 is to waterproof the polyester polyurethane foam of 40 t,
Store in polyethylene foam bag. During the daytime when the outside air temperature is high, more heat is collected from the sign board 21 and transferred to the heat storage agent 22 for heat storage. When the outside air temperature decreases from night to early morning, the sign plate 21 is heated by radiating heat only from the heat storage agent 22 from the sign plate 21 side, and the temperature is kept higher than the ambient temperature around the outside air.

Conventionally, when the outside temperature rises in the morning, the signboard 21
When heat is collected and transferred to the heat storage agent 22, the temperature of the heat storage agent does not rise immediately due to its large heat capacity, and the temperature gradually rises several hours later than the temperature rise of the outside air temperature. For this reason, the sign surface sometimes became cloudy when the outside air temperature rose in the morning. In the present invention, a heat buffer material 38 is provided to solve this problem, so that when the outside air temperature rises, the temperature rise of the sign board 21 is not delayed, and when the outside air temperature falls, the rapid heat release is buffered. It is composed.

Further, the heat insulating material 24 inserted between the container 23 for storing the heat storage agent and the back plate 25 prevents heat radiation from the back plate 25 side. In addition, the container 23 for storing the heat storage agent is provided with a heat buffer material 38.
And the sign board 21 by using elasticity.

Next, FIG. 6 shows a comparison test between the road sign (E) of the present invention, a road sign composed of only an aluminum plate without a fogging prevention function (hereinafter referred to as a conventional product (F)) and an ambient temperature (G). Shown in

FIG. 6 is a graph obtained by recording the temperatures of the sign surface and its surroundings for 24 hours and plotting them in a graph. The temperature of the sign surface of the present invention is higher than that of the conventional product (F) from night to early morning. Shows a high temperature. This is because the sign surface is heated by the heat storage energy released from the heat storage agent after the surrounding temperature starts to decrease in the evening. From the above comparative test results, the label of the present invention shows an extremely effective fogging prevention effect.

[0041]

The present invention relates to the improvement of road reflectors, car side mirrors, road signs, and the like provided at intersections of roads or places with poor visibility. It has a remarkable effect of preventing dew condensation, freezing, and snow accretion on the mirror surface of the reflector and the sign surface of the road sign on a sunny day and a snowy day, and can enhance the safety of road traffic.

As a conventional countermeasure for preventing dew condensation, freezing, and snow accumulation, there is a method of incorporating an electric heater. However, electric work for drawing in electricity is troublesome, and there are problems such as a life of the heater and electricity cost. There is a method using a heat storage agent, but there is no sufficient effect due to a delay in the heat storage time, a shortage of the heat storage holding time, and the like, and there is a problem in traffic safety. In the present invention, the heat storage and the heat radiation of the heat storage device are eliminated by the heat propagation by the far-infrared rays, and the effect can be greatly increased.

[Brief description of the drawings]

FIG. 1 is a partially cut-away cross-sectional view of an essential part showing an example of an embodiment of the present invention.

FIG. 2 is a partially cutaway perspective view showing an example of a container for storing a heat storage agent.

FIG. 3 is a graph showing the behavior of a temperature change measured by comparing the performance of the road reflector (A) of the present invention with the conventional products (B) and (D).

FIG. 4 is a graph showing a behavior of a temperature change measured by comparing the performance of the road reflector (A) of the present invention with the conventional products (B) and (C).

FIG. 5 is a partially cut-away cross-sectional view of an essential part showing an example of an embodiment of the present invention.

FIG. 6 shows a road sign (E) of the present invention and a conventional product (F).
6 is a graph showing the behavior of a temperature change measured by comparing the performances of FIG.

FIG. 7 is a partially cutaway sectional view showing an example of a container for storing a heat storage agent.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 mirror surface plate 1A mirror surface 1B mirror surface inside 2 back plate 3 eaves plate 4 container for storing heat storage agent containing far-infrared radiator 5 heat storage agent containing far-infrared radiator 6A heat insulating material 6B heat insulating material 7 mirror surface back plate fastening portion 8 support plate 9 Connecting piece 10 Axis 11 Positioning stopper 12 Long groove 13 Column 14 Clamp 15 Equivalent fluid seal 16 Outer peripheral seal 17 Injection 18 Heat conduction buffer 19 Far-infrared radiator 20 Reflector 21 Marker plate 21A Marker surface 22 Heat storage agent 23 Container for storing heat storage agent 24 Insulating agent 25 Back plate 26 Support fitting 27 Connecting fitting 28 Positioning stopper 29 Arm fitting 30 Column 31 Clamp 33 Injection 34 Reflector 35 Reflective sheet 36 External far-infrared radiator 37 Internal far-infrared radiation Container 38 Thermal buffer

Claims (5)

(57) [Claims] 1. A far-infrared ray radiating section is installed on the back side of a metal plate collecting and radiating section, and a gel heat storage agent having a melting point of −50 ° C. to 0 ° C. is placed in a heat-propagating container and installed on the back side. A heat storage and heat radiating device, wherein a reflector is installed on the back surface, a heat insulating material is further installed on the back surface, and a back plate is provided on the back surface to be integrated. 2. A heat storage and heat radiating device according to claim 1, wherein a far infrared radiator of 3 to 30% of the heat storage material is blended in the gel heat storing material on the back side of the metal plate heat collecting and radiating portion. . 3. The method according to claim 1, wherein the far-infrared radiating portion and the gel-like heat storage agent are connected to each other through an air layer with good heat propagation or as a heat conductive buffer. The heat storage / radiation device according to any one of the above. 4. The heat storage / radiation device according to claim 1, wherein the metal plate collector / radiator has a mirror surface. 5. The heat storage / radiation device according to claim 1, wherein the metal plate collector / radiator is a sign plate.