JPH0431511Y2 - - Google Patents

Description

[Detailed explanation of the invention] ``Purpose of the invention'' The invention relates to a cooling sheet that utilizes latent heat of vaporization, which can be attached appropriately to the surface of an object to be cooled, and which prevents leakage and scattering of cooling water. To obtain a sheet-like cooling body that can stably continue an efficient cooling effect over time due to latent heat of vaporization, can be advantageously applied to large parts or equipment with a relatively small member, and is easy to handle. This is what we are trying to do.

Industrial applications Cooling sheets used on the surfaces and roofs of automobiles and other equipment, agricultural greenhouses (plastic greenhouses, glass houses), etc.

Conventional technology In order to avoid high temperatures in cars and greenhouses during the summer, etc., it is necessary to use air conditioners, etc., and to avoid indoor temperatures rising due to radiant heat from the roof, water is sprinkled every short period of time. It is common practice to install sunshades and even operate coolers.

In addition, for cooling purposes in such cases,
No. 53-34074 has been published, and a cooling means is known in which a thin plate of hydrophilic polyurethane sponge is formed into a cylindrical shape, with a stretchable sheet material attached to the surface if necessary. This is done by soaking a sponge in water and attaching it to a bottle or the like to cool it down.

Problems that the invention aims to solve However, the conventional general watering method described above is complicated to operate, and the method using an air conditioner lowers the temperature of the roof through the indoor atmospheric temperature. It is indirect and heating by direct sunlight continues even after gradual cooling, so it is not easy to reach the target temperature. This requires a lot of energy and is uneconomical.

According to the above-mentioned Utility Model Application Publication No. 53-34074,
The thin sponge plate absorbs water and is covered with a bottle or the like, and is cooled by the latent heat of evaporation of the occluded water, but in this case, it is difficult to make the structure of the thin sponge plate contain 100% water. In addition, it is inevitable that a large amount of moisture will drip from below, and furthermore, the amount of occluded water will gradually decrease due to evaporation of moisture, resulting in a gradual decline in the cooling effect. However, a stable and desirable cooling effect cannot be maintained over time. Therefore, it requires a large body for the object to be cooled, which inevitably makes it difficult to apply it to large passenger cars, greenhouses, etc., and even if it is used, it has the disadvantage that a desirable cooling effect cannot be obtained.

"Configuration of the Invention" Means to solve the problem A cooling sheet utilizing latent heat of evaporation, characterized in that a heat conductive film is bonded to a non-permeable stretched porous resin membrane via a permeable porous material, the periphery of the sheet-like material is sealed with adhesive to make the permeable porous material part sealed, and a water supply means is provided that opens into the permeable porous material.

Function The sheet-like cooling body made of a water-impermeable stretched porous resin membrane, a water-permeable porous material, and a thermally conductive film has appropriate flexibility and bendability, so it does not disturb the curves or irregularities of the object to be cooled. It is attached with appropriate adhesion.

By adhesively sealing the periphery of the sheet-like material and sealing the water-permeable porous material portion, the water-permeable porous material portion is always kept full of water.

The thermally conductive film effectively transfers and absorbs heat from the object to be cooled, and transfers it to water or other liquid contained in the water-permeable porous material. The liquid to which the amount of heat has been transferred is vaporized by latent heat of vaporization, and this vapor passes through the water-impermeable stretched porous resin membrane and is dissipated to the outside world.

The water in the water-permeable porous material portion, which has been reduced by the vaporization and diffusion, is constantly replenished by the water supply means opened in the water-permeable porous material, so that stable cooling is always achieved.

Therefore, stable and efficient cooling can be accurately obtained over a long period of time with just one setting.

EXAMPLE To explain a specific embodiment of the present invention as shown in the attached drawings, in the present invention, as shown in FIG. 2 is partially adhered in the form of dots or lines with an adhesive 3, and the adhesive 3a is also applied on the inner surface of the water-impermeable stretched porous resin membrane 1 in the form of dots or partially divided lines. A water-permeable (water-containing) porous material 6 such as a non-woven fabric is partially applied and adhered to the back surface of the water-permeable porous material 6. Thermal conductive film 4
We propose a sheet-like material 5 with an adhesive 3b attached thereto, and an adhesive seal 9 around the entire circumference of the sheet-like material 5 to seal the porous material 6 portion. The above-mentioned back reinforcing material 2a is the above-mentioned water permeable porous material 6.
The adhesive 3b may be omitted as appropriate in consideration of the strength characteristics, etc., and the adhesive 3b may be a linear or dotted partial adhesive in addition to the entire adhesive. Note that a back reinforcing material (similar to the front reinforcing material 2) may be appropriately interposed and bonded between the water permeable porous material 6 and the water impermeable stretched porous resin membrane 1. A super absorbent resin (water retaining agent) or the like may be used as a material that retains water.

The specific structure of the water-impermeable stretched porous resin membrane 1 described above is as shown in some representative examples in FIGS. 3 and 4. For example, by stretching a polytetrafluoroethylene membrane, a large number of Micro nodule 1
It is obtained as a web-like structure in which countless microfibers 12 are formed between the fibers 12, and the porosity is at least
75% or more, it has sufficient air and moisture permeability, and as mentioned above, the fine pores between the fibers are micrometers.
In some cases, it can adequately capture ultrafine particles as small as 0.02 μm, and together with the water repellency of the resin itself, it has appropriate waterproofness, that is, water permeability. , FIG. 3 shows stretching in one direction, and FIG. 4 shows stretching in multiple directions. As an example, the sheet-like material 5 described above is cut into a rectangular plate shape as shown in FIG. was inserted, and the four sides of the tube 8 were high-frequency welded and bonded 9, leaving the insertion portion of the tube 8, to seal the water-permeable porous material 6, and the insertion port 8a of the tube was sealed using an adhesive.

To attach this item to the car body, use double-sided tape to fix it to the roof of the car, then tube 8
The sheet material 5 of the present invention is filled with water by connecting it to the discharge port of the washer fluid discharge pump of the car, and putting tap water into the washer fluid tank and operating the pump. That is, at this time, the air previously contained in the porous materials 1, 6 or the reinforcing material 2a is immediately discharged to the outside air via the water-impermeable porous membrane 1, and the water-filled state is always maintained. However, when a passenger car equipped with such a bag-like body 5a having an area of 1 m ² was left under sunlight for 2 hours on a clear day, the temperature inside the car was 47°C. The temperature of a normal car not equipped with heat treatment under the same conditions was 62 degrees Celsius. or,
When a car with a 1 m ² of this invention installed was driven under the scorching sun, the temperature reached a comfortable 23 to 27 degrees Celsius, enough to drive without having to open the windows.

In addition, as mentioned above, film 4 with excellent thermal conductivity
In addition, the present invention, which can always reinforce water against the water-permeable porous material 6, does not need to cover the whole area as described above when used for roofs, etc., and can be attached to a part. A favorable effect can be obtained even by just doing this, and this is of great practical significance.

"Effects of the Invention" According to the invention as explained above, a water-impermeable stretched porous resin membrane 1 is used, and a thermally conductive film 4 and a surface reinforcing material 2 are attached to this through a water-permeable porous material 6.
Since the periphery is adhesive-sealed, it has appropriate flexibility and can be effectively attached to the roof of the vehicle or other parts of the vehicle. The water-permeable porous material 6 effectively conducts and absorbs the amount of heat in
The moisture contained in the membrane is diffused and the latent heat of vaporization effectively cools it, but at this time, the vaporized vapor is released into the atmosphere through the structure of the stretched porous resin membrane, which is impermeable to water. , Moreover, the amount of water reduced due to such vaporization and release is successively replenished into the porous material 6 by a water supply means, so that the porous material 6 is always kept full of water,
The advantageous cooling effect that utilizes the latent heat of vaporization and does not particularly require energy for cooling can be maintained at 100% of the time. It is a device that achieves an appropriate cooling effect even for passenger cars and houses, etc. with a small unit, and it is extremely easy to handle as it can maintain this effect for a long time simply by setting it up. This is a device that has great practical effects.

[Brief explanation of the drawing]

The drawings show embodiments of the invention,
Figure 1 is an enlarged cross-sectional view of the sheet-like material used in the present invention, Figure 2 is a perspective view showing an example of the cooling body according to the present invention, and Figures 3 and 4 are the non-water permeable materials used in the present invention. FIG. 2 is a tissue diagram showing an example of a stretched porous resin membrane. In these drawings, 1 is a water-impermeable stretched porous resin membrane, 2 is a front reinforcing material, 2a is a back reinforcing material, 3, 3a and 3b are adhesive parts, 4 is a thermally conductive film, and 5 is a sheet-like material. , 6 is a water-permeable porous material, 8 is a water supply means such as a tube, 8 a is an insertion port thereof, 9 is an adhesive seal portion, 11 is a micro nodule portion, and 12 is a fine fiber.

Claims (1)

[Scope of utility model registration request] The periphery of a sheet-like material in which a thermally conductive film is adhered to a water-impermeable stretched porous resin membrane via a water-permeable porous material is adhesively sealed to seal the water-permeable porous material portion, and the water-permeable A cooling sheet using latent heat of vaporization, characterized by having a water supply means opened in a porous material.