JPH0777297A - Heat insulating plate - Google Patents

Abstract

PURPOSE:To provide a heat insulating plate, in which insulating performance is improved without any increase in a thickness dimension or in weight. CONSTITUTION:A heat insulating plate 1 consists of a plate honeycomb material 3, in which multiple through holes 3a... are formed in the vertical direction, film sheets 2, 2, which respectively cover over and under the honeycomb material 3 so as to seal the through holes 3a..., and gas with low thermal conductivity sealed in the through holes 3a.... In this way, the thickness and the weight of the heat insulating plate can be reduced while the predetermined heat insulating performance is secured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat insulating plate which is attached to an opening such as an open showcase and closes the opening.

[0002]

2. Description of the Related Art Conventionally, a heat insulating plate used in a showcase or the like is provided with a large number of through holes in the vertical direction as disclosed in Japanese Patent Publication No. 63-37307 (25D27 / 00) as a heat insulating translucent member. It was composed of a flat plate-shaped honeycomb material formed with and plate materials adhered to the upper and lower surfaces of the honeycomb material.

According to such a heat insulating plate, the inside of each through hole forms an adiabatic air layer, and since the through holes of the honeycomb material are independent of each other and air convection hardly occurs, a relatively lightweight and high heat insulating plate is provided. It can exert its performance.

[0004]

However, even if it is said that each through hole is independent and air convection is unlikely to occur, the substance existing in the through hole is air. The amount of heat transferred between the plates is relatively large. Therefore, in order to improve the heat insulating performance of the heat insulating plate, it is necessary to increase the thickness of the honeycomb in the vertical direction, which causes a problem that the weight increases and handling / management such as attachment / detachment and storage becomes extremely troublesome.

The present invention has been made to solve the above-mentioned conventional technical problems, and provides a heat insulating plate having improved heat insulating performance without increasing the thickness or increasing the weight. The purpose is to do.

[0006]

That is, the heat insulating plate 1 of the present invention
Is a flat plate-shaped honeycomb material 3 in which a large number of through holes 3a ... Are formed in the vertical direction, film sheets 2 that cover the upper and lower sides of the honeycomb material 3 and seal the through holes 3a.
..It is composed of a gas with low thermal conductivity enclosed inside.

[0007]

According to the heat insulating plate of the present invention, the inside is made of the honeycomb material 3
Are divided into a plurality of through-holes 3a ... And these through-holes 3a ... Are sealed by the film sheets 2 and 2, so that gas convection in the heat insulating plate 1 is unlikely to occur. Furthermore,
Since a gas having a low thermal conductivity is filled in the through holes 3a, ..., The amount of heat that conducts the gas in the through holes 3a ,. As a result, the heat insulating property of the heat insulating plate 1 is remarkably improved, so that it is possible to reduce the thickness and reduce the weight while ensuring a predetermined heat insulating performance.

[0008]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a partially cutaway perspective view of a heat insulating plate 1 of the present invention, and FIG. 2 is a showcase S as an embodiment to which the heat insulating plate 1 is attached.
The vertical side view of each is shown. In FIG. 1, a heat insulating plate 1 of the present invention comprises a flat plate-shaped honeycomb material 3 made of resin (for example, vinyl chloride), which has a hexagonal shape and has a large number of through holes 3a ... The honeycomb material 3 is composed of a pair of aluminum film sheets 2 and 2 attached in contact with the upper surface 3b and the lower surface 3c. These film sheets 2 and 2 are adhered to each other at their peripheral edges by an adhesive, for example, or the contact surfaces between the peripheral edges and the upper and lower surfaces 3b and 3c of the honeycomb material 3 are adhered to them so that the through holes 3a. It is sealed from.

Further, for example, sulfur hexafluoride (SF ₆ ) gas, for example, 12.5 kg / cm ³ is introduced into each through hole 3a.
Enclose at the rate of. This sulfur hexafluoride gas has a property that its thermal conductivity is remarkably lower than that of air, and other gases such as Freon R-22 and R-134a are considered. This gas passes through each of the through holes 3a of the honeycomb material 3 ...
Since the through holes 3a ... Are sealed inside by the film sheets 2 and 2 from above and below, gas convection between the film sheets 2 and 2 is hardly performed.
In addition, since the gas has a low thermal conductivity, the amount of heat transferred through the gas in the through holes 3a is also reduced, and as a result, the heat insulating properties of the heat insulating plate 1 of the present invention are similar to those of the conventional heat insulating plate. Is significantly improved.

That is, in the experiment, the heat insulating property of the conventional heat insulating plate was 0.0430 kcal / mh ° C., but in the heat insulating plate 1 of the present invention, it becomes 0.0287 kcal / mh ° C.
The heat insulating property of the heat insulating plate 1 of the present invention is 3 compared with the conventional heat insulating plate.
It improved by about 3%. By improving the heat insulating properties of the heat insulating plate 1 as described above, the thickness of the heat insulating plate 1 can be reduced and the weight thereof can be reduced. Thereby, the handleability of the heat insulating plate 1 such as carrying, attaching / detaching, and storing is significantly improved.

The heat insulating plate 1 is used as a night cover of a showcase S as shown in FIG. 2, for example.
The structure of the showcase S will be described with reference to FIG. 2. The showcase S is illustrated with the heat-insulating wall 11 having a substantially U-shaped cross-section open to the upper surface and both sides, and the heat-insulating wall 11 attached so as to close the left and right sides. Side plate and the transparent glass plate 1 erected on the upper ends of the side walls 11A and 11A of the heat insulating wall 11
2, 12 and the handrails 13, 13 that are attached to the upper ends of the glass plates 12, 12 across the left and right sides, thereby forming the main body, and thus the heat insulating wall 11 has an opening 14 on the upper surface. The inside 16 is formed.

In the interior 16, partition plates 17 having a substantially U-shaped cross section are arranged in parallel with each other at a distance from the inner surface of the heat insulating wall 11. The partition plates 17 and 17 are opposed to each other at a central portion of the interior 16 with a space therebetween, and a cold air discharge member 18 located in the opening 14 and extending to the left and right is provided at the upper end of the facing vertical wall. It is installed. Further, guards 19 and 19 facing each other inside the glass plates 12 and 12 with a gap are attached to the upper ends of the vertical walls on the opposite sides of the partition plates 17 and 17, respectively.

A cold air passage 21 is formed between the partition plates 17, 17 and the heat insulating wall 11, and the cold air passage 21 is
Cold air discharge port 2 formed on the front and rear surfaces of cold air discharge member 18
2, 22 and guards 19, 19 and glass plates 12, 12
It communicates with the cold air suction ports 23, 23 formed therebetween. In the cold air passage 21, a cooling device (not shown) including a cooler and a blower is installed. Cool air from the cooling device is discharged from both cold air discharge ports 22 and 22 as shown by arrows in the figure, and the partition plate 17, After being circulated above 17, the air is sucked into the cold air passage 21 through the cold air suction ports 23, 23.

Frozen food G, for example, is stored on both partition plates 17, 17 of the interior 16 of the showcase S, and is cooled and maintained at a predetermined freezing temperature by the cold air circulated as described above. In this way, when the showcase S is opened,
The product G is displayed in the warehouse 16 while being cooled. Then, the customer selects the product G from the opening 14, takes out the product G, and purchases it. However, since cold air inevitably leaks from the opening 14, the power consumption corresponding to that is wasted. Therefore, when the store is closed and it is not necessary to deliver the product G, it is advantageous to keep the opening 14 closed.

Then, when the store is closed, the showcase S
The heat insulating plate 1 of the present invention is placed on the opening 14 to close the opening 14. In this case, a plurality of heat insulating plates 1 are installed between the top surface of the cool air discharge member 18 and the handrails 13, 13 to open and close the openings 14 in the front and rear of the cool air discharge member 18. At this time, since the heat insulating plate 1 has the high heat insulating property as described above, heat invasion into the interior 16 is effectively prevented. Therefore, it is possible to significantly improve the cooling efficiency of the showcase S while the store is closed and save energy. Further, as described above, since the heat insulating plate 1 can be made thin and light,
The work is remarkably easy when attaching to and detaching from the showcase S.

In the embodiment, two film sheets 2,
Although the honeycomb material 3 is sandwiched between the two, the present invention is not limited to this, and one film sheet may be bent and adhered to the upper and lower sides of the honeycomb material 3. Further, the heat insulating plate 1 of the present invention is not limited to the above-mentioned showcase and is effective for heat insulating of various devices.

[0017]

As described above in detail, according to the present invention, the inside of the heat insulating plate is divided into a plurality of through holes by the honeycomb material, and the through holes are sealed by the film sheet. The convection of the gas becomes difficult to occur. In addition, since the gas with low thermal conductivity is enclosed in this through hole, the amount of heat that conducts and moves the gas in the through hole is significantly reduced, which significantly improves the heat insulating properties of the heat insulating plate. It Therefore, since it is possible to reduce the thickness and weight of the heat insulating plate while ensuring a predetermined heat insulating performance, handling and management are significantly facilitated.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view of a heat insulating plate of the present invention.

FIG. 2 is a vertical sectional side view of a showcase.

[Explanation of symbols]

 1 Heat insulating plate 2 Film sheet 3 Honeycomb material

Claims (1)

[Claims] 1. A flat plate-shaped honeycomb material having a large number of through holes formed in the vertical direction, a film sheet for covering the upper and lower sides of the honeycomb material to seal the through holes, and a low thermal conductivity enclosed in the through holes. A heat insulating plate characterized by being composed of a gas of a certain rate.