JPS60114679A - Vacuum heat-insulating box body - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to the structure of a heat insulating box incorporating a flat vacuum heat insulating material.

[Background of the invention]

Currently, there are various insulation methods, most of which utilize the low thermal conductivity of the filling material, and the insulation performance of this method is
There are limits of course.

Alternatively, approximately 10-4'['o
There is a vacuum insulation method that creates a high vacuum before and after and prevents convective heat transfer by collisions between gas molecules, but due to the pressure-resistant structure of the vacuum container, thermos flasks with a structure that combines cylindrical or spherical bodies, It is mostly applied to containers with curved structures such as dual bottles.

However, structures such as refrigerators, heating cabinets, furnaces, bathtubs, and houses that require high-performance insulation materials are flat plate-like or box-like structures that combine these. For this purpose, a flat plate-shaped vacuum heat insulating material having a spacer provided therein in consideration of pressure resistance has been considered.

A conventionally known example will be explained with reference to FIGS. 1 and 2. 1 is a flat outer plate, 2 is a U-shaped longitudinal section,
A side plate whose entire surface is shaped like a mouth when viewed from above; 3 is a fixed-shaped spacer made of a porous and continuous material; and 4 is a valve for evacuating the inside of the container to a high vacuum.

In such a flat plate-shaped vacuum insulation material, the spacer 4 is porous and has voids, but the material is continuously formed on eight sides from the A side of the flat outer plate l, and heat conduction is large, and the voids are Even if the degree of vacuum is increased and the convection loss of gas is reduced, the insulation function is insufficient.Compared to non-spacer type vacuum insulation materials such as thermos bottles mentioned above, the heat loss is about an order of magnitude higher in non-vacuum types. The performance was equivalent to that of urethane foam insulation, which is the highest-performance insulation material, but the manufacturing cost was high (and there were some disadvantageous defects).

[Object of the Invention] The present invention has been accomplished in order to improve the above-mentioned defects.

[Summary of the invention] That is, a non-continuous spacer of a non-uniform body that compressively deforms is arranged in a concave part of a drawn outer plate formed in a shallow box shape, and is covered with a flat outer plate, and this outer peripheral part and a flange are arranged. The container is hermetically welded around the entire circumference, the inside of the container is evacuated, and the seal is cut. At this time, the discontinuous spacer is compressed and deformed, resulting in a vacuum insulation material whose flat outer plate is mainly deformed into a concave shape. The back plate of the inner box is brought into close contact with the concave portion of the box, and an outer cover is provided so that the apertured outer plate on the back side is exposed, and the inner cavity of the outer cover is filled with foam foam.

[Embodiments of the invention]

An embodiment of the present invention will be described with reference to FIGS. 3 to 7. 5 is a drawn outer plate that is press-formed into a shallow box shape, and is made of a material that has low thermal conductivity and high corrosion resistance. Use a stainless steel metal material that releases little gas. 5a is the aperture outer plate 5
The flange 5b on the outer periphery of the flange 5b is a throttle hole through which the vacuum pipe is welded, 6 is a flat outer plate made of stainless steel metal, and the outer dimensions are those of the flange 5a.
The external dimensions shall be the same as that of 7 is a discontinuous spacer,
It has an amorphous shape with respect to external pressure, and undergoes compressive deformation when vacuum pressure is applied, and this discontinuous spacer 7 is parallel to the bottom surface of the aperture outer plate 5, that is, in a direction perpendicular to the heat transfer direction. It may be composed of a fibrous material laminated randomly, a fine granular powder material, or a combination of these.
The material must be discontinuous and independent in the direction of heat transfer.

Therefore, when subjected to a vacuum pressure of 1 h/cA, it always undergoes compression deformation and shrinks to a certain size. 8 is a vacuum pipe that is hermetically welded to the throttle hole 5b; 9 is a filter that prevents a part of the discontinuous spacer 7 from flowing into the vacuum vibrator 8; and 10 is a flat plate composed of the above parts. 11 is an outer cover of the cabinet, 12 is an inner box, 12a is a back plate on the back side of the inner box 12, and 13 is an outer cover 11 and an inner box 1.
The foam platform 14a is filled into the gap between the upper door 1 and the foam platform 14a.
4b is the lower door, 15 is the partition, 16 is the backing, 17
is an evaporator, 18 is a compressor, 19 is a blower, 20 is a bell mouth, and 21 is a fan guard.

To construct a vacuum insulation box using these parts, first assemble the flat plate-shaped vacuum insulation material as follows.

A vacuum pipe 8 is hermetically welded to the aperture outer plate 5, and a filter 9 is attached to the opening of the vacuum pipe 8 inside the aperture outer plate 5.
Then, a discontinuous spacer 7 is placed inside the aperture outer plate 5.
After that, it is covered with a flat outer plate 6, and the flange 5a is closed.
Then, the outer periphery of the flat outer plate 6 is hermetically welded to form the structure as shown in FIGS. 4 and 5. After this, a vacuum pump (not shown) is connected to one end of the vacuum pipe 8, and the entire Vacuum baking is performed in a furnace. At this time, the discontinuum spacer 7 is
It is pressurized by l Kid by evacuation, and the flat outer plate 6 is mainly deformed by a certain amount in the C direction. That is, the aperture outer plate 5
Compared to the flat plate-like outer plate 6, deformation is small due to material work hardening due to drawing processing and increased rigidity due to the three-dimensional structure,
The flat outer body 6 is mainly deformed into a concave shape according to the discontinuous spacer 7. At this point, exhaust the air sufficiently and vacuum the pipe 8.
A part of the vacuum insulation material 11' is cut under pressure, and the cut portion is simultaneously sealed to seal the sole, thereby completing a flat vacuum insulation material 11' as shown in FIG.

Next, the structure of the box will be described. The back plate 12a of the inner box 12 is attached tightly to the recess of the flat outer plate 6 of the vacuum heat insulating material 11. Therefore, the size of the back plate 12a needs to be smaller than the recess of the flat outer plate 6. This is attached to the outer panel 11, and the void formed by the outer cover 11, inner box 12, and vacuum insulation material 10 is filled with foam foam 13 to form a box body. 14b is attached to form a cabinet having a sealed space, and refrigeration equipment such as an evaporator 17, a compressor 18, and a blower 19 are attached to complete the refrigeration pressure.

〔Effect of the invention〕

Vacuum insulation material 11 to be incorporated into the vacuum insulation box configured as above
By filling the discontinuous spacer 7 in the form of fibers or powder, a large number of contact thermal resistances exist in the heat transfer direction, and the apparent thermal conductivity of the discontinuous spacer 7 is ``very small. Even compared to urethane foam material, it is more than one order of magnitude lower and can be ignored. Further, the void portion of the discontinuous spacer 7 has a small representative gap and can prevent convective heat transfer even if the molecular free path is small. That is, even if the degree of vacuum is slightly poor, the insulation function is sufficiently improved. Therefore, even if the vacuum heat insulating material 10 has a built-in spacer, it has the effect of having a heat insulating ability equal to or higher than that of a thermos flask.

In this case, the discontinuous spacer 7 undergoes compression deformation, but
The flat outer plate 6 side is mainly deformed, and the back plate 12a of the inner box 12 is attached in close contact with the recess formed on this side.
It eliminates the dead space associated with the concave structure and allows for thinner insulation materials.

In addition, the vacuum insulation material 10 of the present invention has no rigidity because it is composed of an extremely thin drawn outer panel 5, a flat outer panel 6, and a discontinuous spacer 7 in order to prevent heat conduction loss in the outer panel. Since the cover 11 and the foam foam 13 are fixed together, the strength is greatly improved.

Furthermore, since the vacuum insulation material 10 has an outer plate made of a thin stainless steel metal material, the inside of the box body is completely protected by the back plate 12a of the inner box 12 in order to prevent vacuum deterioration due to this damage. On the other hand, since the outside part is used close to a wall surface in most applications, there is no damage to this part, and there is no problem even if the aperture outer plate 5 is left exposed.

As described above, the vacuum insulation box of the present invention exhibits a high insulation function due to the vacuum insulation material containing the discontinuous spacer. The effect of thinning the insulation material is enormous.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a conventional embodiment, Fig. 2 is a vertical sectional view of Fig. 1, Fig. 3 is a perspective view of the aperture outer plate of the present invention, and Fig. 4 is a vacuum insulation 5 is a vertical sectional view of FIG. 4, FIG. 6 is a vertical sectional view after sealing is cut, and FIG. 7 is a sectional view of the heat insulating box. 5... Diaphragm outer plate, 5a... Flange, 5b... Hole, 6... Flat outer plate, 7... Discontinuous spacer, 8
...Vacuum pipe, 9...Filter, 1o...
・Vacuum insulation material, 11...outer cover, 12...inner box,
12a... Back plate, 13... Foaming platform, 14a.
...Upper door, 14b...Lower door, 15...Inner partition, 1
6...Backing, 17...Evaporator, 18...Compressor, 19...Blower, 2o...Bell mouth, 21
...Fan guard. Half 4 - Figure '$5 Figure 6 Figure 6

Claims (1)

[Claims] 1. A non-continuous spacer (7) of a non-regular shape that is compressively deformed is disposed in a concave portion of a drawn outer plate (5) formed in a shallow box shape, and a flat plate-shaped outer plate (6) is arranged. Cover this outer periphery with the flange (5a
) is hermetically welded around the entire circumference, and the inside of this container is evacuated and sealed. At this time, the discontinuous spacer (7) is compressed and deformed, and as a result, the flat outer plate (6) is mainly formed into a concave shape. The back plate (12a) of the inner box (12) is brought into close contact with the recess of the vacuum insulation material (10) that has been transformed into
A vacuum insulated box body characterized in that an outer cover (11) is provided so as to be exposed, and the inner cavity of the outer cover (11) is filled with foam foam (13). 2. Furthermore, a cabinet having a closed space with doors (14a) and (14b) is configured, and refrigeration equipment such as an evaporator (17), a compressor (18), and a blower (19) are arranged in this cabinet. A vacuum insulation box according to claim 1, characterized in that: