JPH02183034A - Expanded heat insulator - Google Patents

Abstract

PURPOSE:To permit a heat-insulating wall to be formed and removed by a simple liquid control method using an expanded heat insulator in which an expandible liquid of a specific expansion ratio is supplied to the space between two light-permeable plates or the liquid after it is supplied and expanded is recovered. CONSTITUTION:A raw liquid in a raw liquid tank is mixed with water in a mixture 3 and expanded to bubbles of an expansion ratio of 100 times or more in an expanding machine 4, and the expanded liquid is injected into the space between the two light-permeable plates of a heat insulator 1. Water, bubbled water, or other solution is spread from a sprinkling nozzle 5 to between the two light-permeable plates to allow a reducing liquid formed by expansion to flow downwards. The reducing liquid is directed from a drainage into a reducing liquid tank 6 for recovery. The light permeation rate can thus be simply controlled by utilizing the transparent heat insulator 1 wall or window which can also be used as effective ornaments or interior.

Description

[Detailed description of the invention] <Industrial application field> The present invention relates to the structure of foam insulation.

<Prior Art> In order to improve the heat insulation properties of walls, a method has been adopted in which the walls are made double and an air layer is provided between them.

<Object of the present invention> An object of the present invention is to provide a structure of a foam heat insulating body that can further improve the heat insulating effect of the wall of such a structure.

A further object of the present invention is to provide a foam heat insulating material whose heat insulating layer can be easily removed when the heat insulating effect is not required.

<Means for Solving the Problems> The principle of the structure of the present invention is as follows: (1) The double wall is made of transparent or semi-transparent material, (2) The heat transfer by air convection between the double walls is This is prevented by finely partitioning the pond with a foam membrane (3) to create a small convection discontinuity inside the pond.

This limits heat transfer between the double-walled bodies and improves thermal insulation.

<Configuration of the present invention> Next, one embodiment of the present invention will be described.

<A> Heat Insulating Member The heat insulating member 1 of the present invention is constituted by two light-transmitting plates, such as glass plates or synthetic resin plates.

That is, the entire structure, such as a greenhouse, or a part of the ceiling, walls, etc., or a window is constructed of two transparent or semi-transparent plates.

<Port> Foaming device The foaming device includes a stock solution tank 2, a water tank 7, a reducing liquid tank 6, a mixer 3, a foaming machine 4, and the like.

The stock solution tank 2 is a tank that stores stock solution of foaming material.

The mixer 3 is a known device that mixes the stock solution and water.

The foaming machine 4 passes the stock solution through a mesh nozzle 41 to a mesh 4.
This is a device that performs foaming by spraying on the foam.

By installing this foaming machine at a high place in the structure, it is configured to inject foam between the two light transmitting plates of the heat insulating member 1 using positional energy.

<C> Defoaming device A defoaming device is a device for extinguishing foam generated in a foaming device.

For this purpose, the defoaming device is constituted by a water spray nozzle 5 which can supply water or other solutions.

<Action of the present invention> Next, the operation of the apparatus of the present invention will be explained.

<A> During foaming, the stock solution in the stock solution tank 2 and water are mixed in a mixer 3 and foamed in a foaming machine 4.

The foaming liquid is injected into the space between the two light transmitting plates of the heat insulating member 1.

If the structure is a greenhouse, the double roof and wall spaces will be filled with foam.

The same applies to other structures.

Foam that has been expanded and filled will naturally break down over time (so you will need to add foam intermittently to fill the product.

<Exposure> When defoaming For example, in a greenhouse in winter, foam is not necessary to let in sunlight during the day.

Therefore, water, a foam aqueous solution, or other solution is sprayed from the water spray nozzle 5 into the gap between the two light transmitting plates of the heat insulating member 1.

The foam then disappears rapidly.

It is also possible to adopt a method of sprinkling water intermittently so as to suppress secondary foaming caused by sprayed water droplets.

In this case, for example, a method of repeating water sprinkling for 3 seconds at 10 second intervals several times is adopted.

The reducing liquid generated by the bubble breakage flows down to the lower part, flows into the reducing liquid tank 6 from the drainage ditch, and is recovered.

In addition, in order to perform more complete defoaming, secondary water sprinkling may be performed to wash away the foam aqueous solution adhering to the inside of the transparent plate.

Since this cleaning liquid has a low concentration, it is not collected into the reducing liquid tank 6 but is drained outside.

<C> Reuse of recovered liquid The reducing liquid that has flowed into the reducing liquid tank 6 is again supplied to the foaming machine 4 and reused.

At this time, it is conceivable that the cleaning liquid may be added by several percent to several tens of percent.

<2> Other Examples Although the method of spraying water for defoaming has been explained, it is also possible to adopt a method of supplying gas to the gap in the insulation member 1 and expelling the foam by blowing air instead of using water. .

The foaming stock solution can be composed of a surfactant.

Foaming can be carried out by mixing gas into the foaming stock solution.

In addition to air, an inert gas or a nonflammable gas can be used as the gas to be mixed during foaming.

<E> Foaming ratio Next, the relationship between foaming ratio and heat insulation properties will be explained.

If the foaming ratio is small (the thermal conductivity cannot be kept low).

Therefore, from the experimental example shown in Figure 2, the foaming ratio was 100 times (
Liquid l: gas 99) or more, the thermal conductivity is 0.05
It was found that it was possible to suppress it to about kcal/mh'C.

Therefore, in order to make the most of the heat insulation properties of double insulation members, it is necessary to inject and fill the space between the double insulation members with foam with a foaming ratio of 100 times or more. For greenhouses and buildings, the heating and cooling load can be reduced.

<Comparative Example> A comparison will be made in the case where the heat insulating member of the present invention is composed of two glass plates with a thickness of 3++ on and a foam layer with a thickness of 100 mm is formed.

The heat transmission coefficient in this case is It will be about 0.46Kcal/J h'C.

The value for one sheet of glass is 5.0 to 5.2 Kcal/J h'C1, and 2.6 to 2.9 Kcal for using glass and double curtains.
l# h°C.

Therefore, it can be seen that the insulation properties are far better than those.

<Effects of the Present Invention> Since the present invention has the above-described structure, the following effects can be achieved.

(a) If the foam insulation of the present invention is used in greenhouses, storage warehouses, and other structures, the formation and removal of insulation walls can be performed with simple liquid control.

<Exposure> By using a transparent heat insulating member as the whole (roof, wall) or part (window) of a structure, it is possible to easily change and control the light transmittance.

<C> By combining a lighting device with a transparent heat insulating member, it can be used as a unique interior by adjusting the light transmittance.

(2) When used as a daylight window, it can be used as a blind with heat insulation performance, and can be used for entrances, atriums, sunrooms, etc. of residences, leisure facilities, restaurants, pavilions, etc.

<E> The amount of daylight can also be adjusted by changing the size of the bubbles filled between the two light transmitting plates.

By coloring the bubbles filled inside, the color of part or all of the wall can change over time, giving the same impression as if the wallpaper had been replaced in a short period of time. It can also be used as an effective decoration and interior decoration.

[Brief explanation of the drawing]

Figure 1.2 An explanatory diagram of the case where the heat insulating member of the present invention is used in a greenhouse.

Claims (2)

[Claims] (1) A foamed heat insulator configured to supply a foaming liquid, an antifoaming liquid, and recover the liquid after defoaming between two light-transmitting plates. (2) A foamed heat insulating material according to claim 1, characterized in that foam having a foaming ratio of 100 times or more is supplied between two light-transmitting plates.