JPH08114296A - Heat insulated box body - Google Patents

Abstract

PURPOSE: To make any buckling so as not to be produced in the inner box even if the inner part is heated in time of using this heat insulated box body. CONSTITUTION: In this heat insulated box body formed with a heat insulating layer in space between an inner box 13 and an outer box 14, a reinforcing member 18 is installed in a part of the inner box 13 along the main direction of a compressive stress to be produced in this inner box 13 at a time when this box 13 is heated in time of application. With this reinforcing member 18 installed like this, a large thermal deformation is produced in the inner box 13 due to the compressive stress and thereby any buckling is surely prevented from occurring.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat insulating box such as a vacuum heat insulating box.

[0002]

2. Description of the Related Art As a vacuum heat insulating box, one having a structure shown in FIG. 14 is known. Here, 1 is a container body, which is composed of a box-shaped body having an opening 2. The box-shaped body has a structure in which a vacuum heat insulating layer 5 is formed between an inner box 3 and an outer box 4. . At the opening 2, the inner box 3 and the outer box 4 are joined to each other by a thin membrane 6. The opening 2 is closed by the lid 7, thereby forming a heat-insulated closed space inside the container body 1. The lid 7 is composed of a normal heat insulator or a vacuum heat insulator similar to the container body 1.

When the inside of the container body 1 is used at a high temperature, the inner box 3, the outer box 4 and the membrane 6 are usually austenite in consideration of heat resistance, weldability, outgassing and the like. System stainless steel is often used. The vacuum heat insulating layer 5 is formed by filling inorganic fibers such as rock wool and glass wool, silica-based fine powder, or the like between the inner box 3 and the outer box 4, and then performing vacuum evacuation. Is common.

[0004]

However, if the inside of the vacuum insulation box body having such a structure is heated when it is used,
Thermal expansion of the inner box 3 is suppressed by the filling in the vacuum heat insulating layer 5 and the outer box 4, and there is a possibility that compressive stress acts on the inner box 3 to cause buckling.

When the inside of the vacuum insulation box body shown in FIG. 14 is heated during use, the inner box 3 thermally expands, causing deformation in the direction in which the outer wall surface of the container body 1 is recessed as shown in FIG. . When the inside temperature is high in this way, the inner box 3
For example, austenitic stainless steel is often used as a material such as, but since this material has a large linear expansion coefficient,
Thermal deformation is also large and the generated stress tends to increase.
When the vacuum heat insulating layer 5 is filled with fibers or powder as described above, in order to support the atmospheric pressure with these filling materials,
A thin plate having a thickness of 2 mm or less is generally used as a plate material forming the inner box 3 and the outer box 4. However, when a thin plate is used in this way, thermal stress during heating causes
There is a possibility that the inner box 3 will buckle as shown in FIG. 8 is the buckling part.

When the inner box 3 buckles in this way,
On the contrary, when the inside temperature is returned to room temperature, a residual deformation that exhibits a convex shape occurs, which causes problems such as difficulty in joining with other parts and deterioration of appearance.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to solve such problems and prevent the inner box from buckling even if the inside is heated during use.

[0008]

To achieve this object, the present invention relates to a heat-insulating box body in which a heat insulating layer is formed between an inner box and an outer box, when the inner box is heated during use. A reinforcing member is provided in the inner box portion along the main direction of the compressive stress generated in the box.

[0009]

According to this structure, since the reinforcing member is provided in the portion of the inner box along the direction parallel to the main direction of the compressive stress generated during heating, the compressive stress causes large thermal deformation of the inner box. Buckling is prevented from occurring.

[0010]

1 to 3 show an embodiment of the present invention. Here, the container body 11 having the opening 12 at one end is an inner box 13 and an outer box.
14, and a vacuum heat insulating layer 15 is formed between the inner box 13 and the outer box 14, and in the opening 12 the inner box 13 and the outer box 14 are joined to each other by a thin membrane 16. However, on the inner surface of the inner box 13, a reinforcing member 18 formed of a recess integrally formed by recessing the inner box 13 is formed.
Are formed in plural.

These reinforcing members 18 are linearly formed along the main direction of the compressive stress generated in the inner box 13 when the inner box 13 is heated when the container body 11 is used. , Are formed at a distance from each other along the direction perpendicular to the main direction of this compressive stress. As shown in FIG. 3, each reinforcing member 18 is formed of a recess having a semicircular cross section or a gently curved shape.

With such a structure, when the inner box 13 is heated when the container body 11 is used, the buckling is prevented by the action of the reinforcing member 18. In the present embodiment, the reinforcing member 18 is formed on the wider surface of the inner box 13, that is, the surface on which the generated stress becomes higher, and in particular, the bias near the opening 12 where the compressive stress becomes particularly high. It is provided in the position. It is advantageous not only from the viewpoint of buckling prevention but also from the viewpoint of working and cost that the stress is placed only on the portion where the stress is particularly high.

A specific example will be described. First, the inner dimensions are width 1250 mm x depth 1000 mm x height 500 mm, and the insulation thickness is 25 mm.
A vacuum heat insulating box body was prepared by using a 2 mm-thick plate material made of JIS SUS304 material for the outer box and a 1.2-mm thick plate material made of SUS304 material for the inner box. If this vacuum insulation box had the conventional structure shown in Fig. 14, when the inside was heated to 300 ° C, high compressive stress was generated in the width direction of the inner box, and Figs. 16 and 17 The buckling part 8 shown in FIG. Then, when the inside temperature was returned to room temperature, a convex residual deformation with a height of about 5 mm was generated on the outer surface.

However, when the reinforcing member 18 is provided as shown in FIG. 1, no buckling portion is generated in the inner box 13 and no residual deformation of the outer surface remains. The reinforcing member 18 has a semicircular cross section, and has a width of 30 mm, a depth of 5 mm, and a length of 900 mm, and is formed on the widest surface of the inner box 13 at three places each, as shown in FIG. .

The recess 18 has a thickness of 0.8-2 mm in the inner box 13.
When the SUS304 material was used, it was preferable to have a straight line shape or a shape in which vertical and horizontal straight lines were combined, and it was preferable that the cross-sectional shape was a semicircular shape or a gentle curved line shape.
And the width is 10 to 50 mm and the depth is 3 to 15 mm.
It is preferable that the length of the inner box 13 is 1/2 or more of the length of the surface to prevent buckling caused by the action of the compressive principal stress. Also, the cross section 2 of the reinforced portion
It was necessary to make the equivalent plate thickness obtained from the second moment more than twice the plate thickness of the inner box 3. Otherwise, the strain generated when the reinforcing member 18 was provided had an effect, and the reinforcing effect was not observed.

If the width of the concave portion constituting the reinforcing member 18 is too narrow, the depth is too shallow, or the length is too short, the effect of absorbing thermal expansion becomes smaller than the above numerical range. It was Further, if the width is too wide, local deformation occurs inside the reinforcing member 18. Further, if the depth is too deep, problems such as deterioration of heat insulation performance, interference with contents, and difficulty in processing during manufacturing occur.

4 and 5 show another embodiment of the present invention. Here, as the reinforcing member 18, a channel material with a collar, which is separate from the inner box 13, is spot-welded to the surface of the inner box 13 on the side of the vacuum heat insulating layer by utilizing the flange portion. The reinforcing member 18 made of this channel material has a width of 20 mm and a height of 11 mm when the thickness of the inner box 13 is 1.2 mm, for example.
As shown in FIG. 1, by disposing three plates with a thickness of 1.2 mm and a plate thickness of 1.2 mm on the wide side of the inner box 13 and at a biased position near the opening 12, at a pitch of 150 mm, It is possible to give the reinforced portion the strength equal to or higher than that of a plate material having a thickness of 3 mm.

6 to 8 show another embodiment of the present invention.
FIG. 8 shows a detailed cross-sectional structure of the opening 12 of the vacuum heat insulating box according to the present invention. The membrane 16 connecting the inner box 13 and the outer box 14 has heat dissipation from the inner box 13 to the outer box 14. It is formed of a thin plate in order to reduce the number of cross sections and has a U-shaped cross section. 17 is a lid. By using a thin plate for the membrane 16 in this way, when the inner box 13 thermally expands in the depth direction as shown in FIG. 8B, the membrane 16 is deformed correspondingly, Therefore, generally, not much stress is generated in the depth direction of the inner box 13.

However, when a relatively thick material is used for the membrane 16, or when the vacuum insulation box is formed to be extremely long in the depth direction as shown in FIGS. 6 and 7, the depth is also high in this depth direction. There is a risk of compressive stress and buckling. Therefore, in this case, it is effective to provide the reinforcing member 18 extending in the depth direction of the inner box 13 as illustrated.

As the reinforcing member 18, a member protruding to the inner surface side of the inner box 13 may be integrally formed as shown in FIG. 9A, or an uneven portion may be integrally formed. Further, as shown in FIG. 9B, a reinforcing member 18 made of another channel-shaped member may be welded so as to project to the inner surface of the inner box 13. Further, as shown in FIG. 10, the reinforcing member 18 which is a separate member can be formed of an angle member, which can be used as a vacuum heat insulating layer 15 as shown in FIG. 10A or as shown in FIG. It can be welded to the inner surface side of the inner box 13. Similarly, as shown in FIG. 11, the reinforcing member 18, which is a separate member, can be formed of a member having a Z-shaped cross section.

When the reinforcing member 18 is provided on the vacuum heat insulating layer 15 side, the heat insulating performance is slightly deteriorated, and the reinforcing member 18 is provided in the inner box.
If it is provided on the inner surface side of 13, there will be a slight obstruction during storage, but which is to be provided should be decided in consideration of the thermal insulation performance and the positional relationship with the items stored in the vacuum insulation box. You can

Further, when the stresses in the width direction and the depth direction are almost equal and there is a possibility that buckling may occur in either direction, the reinforcing member 18 should be extended in a square shape as shown in FIG. Alternatively, it may be formed to have a cross shape as shown in FIG.

[0023]

As described above, according to the present invention, since the reinforcing member is provided in the inner box portion along the main direction of the compressive stress generated in the inner box when the inner box is heated during use,
It is possible to effectively prevent buckling due to large thermal deformation of the inner box due to the compressive stress, and since the reinforcing member is provided in the inner box in this way, the rigidity of the plate material constituting the inner box is increased. It is possible to improve the manufacturing dimensional accuracy of the heat insulation box.

[Brief description of drawings]

FIG. 1 is a perspective view of a heat insulation box body according to an embodiment of the present invention.

FIG. 2 is a perspective view of an inner box in the heat insulating box.

FIG. 3 is a cross-sectional view of a main part of the heat insulating box.

FIG. 4 is a perspective view of a heat insulation box body according to another embodiment of the present invention.

FIG. 5 is a sectional view of a main part of the heat insulating box.

FIG. 6 is a perspective view of a heat insulation box body according to still another embodiment of the present invention.

FIG. 7 is a perspective view of an inner box in the heat insulating box.

FIG. 8 is a cross-sectional view of an opening of the heat insulating box and the vicinity thereof.

FIG. 9 is a cross-sectional view of a main part of a heat insulation box body according to still another embodiment of the present invention.

FIG. 10 is a cross-sectional view of a main part of a heat insulation box body according to still another embodiment of the present invention.

FIG. 11 is a cross-sectional view of a main part of a heat insulation box body according to still another embodiment of the present invention.

FIG. 12 is a perspective view of an inner box of a heat insulating box body according to still another embodiment of the present invention.

FIG. 13 is a perspective view of an inner box of a heat insulating box body according to still another embodiment of the present invention.

FIG. 14 is a longitudinal sectional view and a transverse sectional view of a conventional heat insulating box.

15 is a vertical cross-sectional view and a horizontal cross-sectional view showing a state when the inside of the heat insulating box of FIG. 14 is heated to a high temperature.

16A and 16B are a vertical cross-sectional view and a horizontal cross-sectional view showing a state where a buckling portion is generated in the inner box in the state of FIG.

FIG. 17 is a perspective view of the heat insulating box of FIG.

[Explanation of symbols]

 13 Inner box 14 Outer box 15 Vacuum insulation layer 18 Reinforcement member

Claims (5)

[Claims] 1. A heat-insulating box body having a heat-insulating layer formed between an inner box and an outer box, wherein the inner box extends along the main direction of compressive stress generated in the inner box when the inner box is heated during use. A heat-insulating box body characterized in that a reinforcing member is provided on the box portion. 2. The heat insulating box body according to claim 1, wherein the reinforcing member is any one of a concave portion, a convex portion, and a concave and convex portion formed on the inner surface of the inner box. 3. The reinforcing member is a member different from the inner box and is attached to the inner box.
Insulated box body described. 4. The heat insulating box body according to claim 1, wherein the reinforcing member has a linear shape or a shape in which vertical and horizontal straight lines are combined. 5. The reinforcing member has a length of 1 / of the length of the surface of the inner box for preventing buckling caused by the action of the compressive principal stress.
The cross section 2 of the reinforced portion having a length of 2 or more
The heat insulating box body according to any one of claims 1 to 4, wherein the equivalent plate thickness obtained from the second moment is configured to be twice or more the plate thickness of the inner box.