JP2001280584A - Structure of vacuum heat insulator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable use of a thin wall material only for a surface material of a vacuum heat insulator and enable an increase in the rate for welding this material for constituting the insulator. SOLUTION: This in a vacuum heat insulator which has a vacuum heat insulation space 15 between a pair of walls 12, 13. An edge of the insulator 15 is formed by a frame member 16, and surface materials 22, 23, 24 constituting the walls 12, 13 are attached to the member 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a structure of a vacuum insulator.

[0002]

2. Description of the Related Art As a vacuum insulator having a vacuum insulation space between a pair of walls, a vacuum insulation panel, a vacuum insulation container, and the like are known. Among these vacuum insulation panels and vacuum insulation containers, those having a backup material have a pair of walls formed of a thin metal plate, and the wall is formed by welding using a thin metal plate similar to these walls. The parts are configured to be joined to each other. That is, by backing up the surface material constituting the wall with the backup material, the surface material does not need to have the strength to withstand the atmospheric pressure, and the surface material can be configured to be thin.

[0003] In this kind of conventional vacuum heat insulator, all the materials constituting the wall portion are determined based on the thickness of the plate material to be used in the place where welding is most difficult among the places where welding is to be performed. Use the same thickness of plate.

[0004]

However, when JIS SUS304 stainless steel is used for the plate, for example, the minimum plate thickness is about 0.5 to 0.8 mm in order to perform reliable vacuum tight welding. Is required, and further thinning is not possible. In addition, as a welding method for plate materials, a butt joint, a butt joint and a lap fillet joint using TIG welding are mainly used, and the welding speed is only about 0.2 to 1.0 m / min. .

Accordingly, the present invention makes it possible to use as thin a plate as possible for the face material of the vacuum heat insulator, and to increase the welding speed when this plate material is welded to form a vacuum heat insulator. The purpose is to be.

[0006]

According to the present invention, there is provided a vacuum heat insulator having a vacuum heat insulating space between a pair of walls, wherein an edge of the vacuum heat insulator is formed by a frame member. The face member constituting the wall is attached to this frame member.

[0007] With such a configuration, since the face member forming the wall is attached to the frame member forming the edge of the vacuum heat insulator, if the face member can be attached to the frame member by welding or the like. For example, a material much thinner than the thickness of the frame member as a face material can be attached to this frame member by laser seam welding or the like, and in that case, it is possible to perform highly reliable vacuum tight welding . In addition, since laser seam welding can be applied, welding can be performed at a high speed.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIGS. 1 to 5, reference numeral 11 denotes a vacuum heat insulating container as a vacuum heat insulating body, which has an inner wall 12 and an outer wall 13 provided at a distance from each other. Each of the inner wall 12 and the outer wall 13 is formed in a rectangular box shape having an open upper end, and the upper ends of the inner wall 12 and the outer wall 13 are connected to each other by the membrane 14, so that the inner wall 12 and the outer wall 13 are surrounded by these members. A vacuum insulation space 15 is formed. Although not shown, the inside of the vacuum heat insulating space 15 is filled with a heat insulating material such as diatomaceous earth.
5 will be evacuated and vacuum sealed.

[0009] The "edge" between the inner wall 12 and the outer wall 13 is constituted by a frame member 16. This frame member 16 is
It is made of an angle material formed of the above-mentioned JIS SUS304 stainless steel material or the like, and has a rectangular bottom portion 17 and a columnar portion 18 projecting upward from four corners of the bottom portion 17 by a welding structure using the angle material. It is comprised so that it may have. Each of the bottom portion 17 and the columnar portion 18 has a configuration in which the angle members are arranged in a predetermined direction so that the corner portions 19 of the angle members constitute the corner portions of the frame member 16. With such a configuration, the outer surface 20 of the angle member is configured to be in the same direction as the outer surfaces of the frame member 16, that is, the outer surfaces of the rectangular box-shaped inner wall 12 and outer wall 13. Each pillar 18
Each of the inner wall 12 and the outer wall 13 has the same height, and the upper end is formed as an edge end 21 inclined toward the inside of the angle member.

Utilizing the outer surface of the angle member constituting the frame member 16, rectangular face plates 22, 23, 2
4 is attached. Specifically, these faceplates
A bottom face plate 22, a pair of short side face plates 23, and a pair of long side face plates 24 are formed.
It is made of IS SUS304 stainless steel.

As shown in detail in FIG.
The vertical dimension and the horizontal dimension correspond to the bottom portion 17 of the frame member 16.
Are configured to be smaller than the vertical dimension and the horizontal dimension. That is, the edge 25 of the bottom face plate 22 is configured to retreat more inward than the corner 19 of the angle material forming the frame member 16. The bottom face plate 22 is welded to the frame member 16 by utilizing the overlapping portion of the bottom face plate 22 and the frame member 16 excluding the retreated portion. Numeral 26 denotes a welded portion. The welded portion 26 is formed by mutually melting the entire portion of the bottom face plate 22 in the thickness direction and a portion of the surface of the frame member 16 by laser seam welding. By performing seam welding and forming the welded portion 26 along the length direction of each side of the bottom face plate 22, vacuum tight welding is performed. With this configuration, at the bottom of the inner wall 12 and the outer wall 13, a portion other than the edge is formed by the bottom face plate 22, and the edge is formed by the frame member 16.

Short side face plate 23 and long side face plate 24
Is as follows. In other words, the short side portion face plate 23 and the long side portion face plate 24 are formed such that the horizontal length is shorter than the vertical length and the horizontal length of the frame member 16. That is, like the bottom face plate 22, the short side face plate 23 and the long side face plate 24
The edge 27 of the side of the frame member 16 is configured to be recessed inward from the corner 19 of the angle material forming the frame member 16. Further, the length of the short side surface plate 23 and the long side surface plate 24 in the vertical direction, that is, the length along the height direction of the frame member 16 is set to be larger than the height of the frame member 16. I have. Then, the short side surface plate 23 and the long side surface plate 2
The lower end edge 28 of the fourth member 4 is configured to be recessed inward, that is, upward from the corner 19 of the angle member forming the frame member 16. On the other hand, the upper end portions 29 of the short side surface plate 23 and the long side surface plate 24 are connected to the columnar portions 18 of the frame member 16.
Is arranged so as to protrude upward from the edge end 21 at the upper end of the.

As a result, the short side face plate 23 and the long side face plate 24 are formed with the edge 27 on the side and the edge 28 on the lower side.
Are inwardly retracted from the corners 19 of the angle members constituting the frame member 16, and by utilizing the overlapping portion of the frame member 16 excluding the retracted portion, the case of the bottom face plate 22 is used. Similarly, the frame member 16 is vacuum-tightly welded to the frame member 16 by a welding portion 26 to which laser seam welding is applied. As a result, similarly, the inner wall 12 and the outer wall 13 have portions other than the edge portions of the short side surface plate 23 and the long side surface plate 2.
4 and the edge portion is formed by the frame member 16.

The upper end of the vacuum insulation container 11 is configured as follows. That is, as shown in detail in FIG.
The edge end 21 at the upper end of the columnar portion 18 of the frame member 16 forming the outer wall 13 is disposed so as to be located higher than the edge end 21 at the upper end of the columnar portion 18 of the frame member 16 forming the inner wall 12. Accordingly, the upper end portions 29 of the face plates 23 and 24 of the outer wall 13 are arranged so as to be located higher than the upper end portions 29 of the face plates 23 and 24 of the inner wall 12. The upper end 29 of the outer wall 13 and the upper end 29 of the inner wall 12 are connected to each other by the membrane 14.
The membrane 14 has a cross section J corresponding to the above positional relationship.
It is formed in the shape of a letter.

The membrane 14 is, for example, a face plate 2
As with 2, 23, and 24, it is preferable to be formed of SUS304 stainless steel material of JIS, and the lower edge 31 corresponding to the inner wall 12 is in contact with the edge end 21 of the columnar portion 18 of the frame member 16 of the inner wall 12. The lower edge 32 corresponding to the outer wall 13 is in contact with the edge end 21 of the columnar portion 18 of the frame member 16 of the outer wall 13 so as to be positioned. Then, in this state, the lower end 33 of the inner wall 12 overlaps the upper ends 29 of the face plates 23 and 24 of the inner wall 12, and the lower end 33 of the outer wall 13 faces the upper ends 29 of the face plates 23 and 24 of the outer wall 13. It is configured to overlap. These overlapped portions are vacuum-tightly welded by a welded portion 34 to which similar laser seam welding is applied. That is, these welds 34 are formed over the entire circumference along the opening at the upper end of the vacuum insulated container 11.

For example, on one short side face plate 23A,
A vacuum exhaust port 36 for forming a vacuum heat insulating space 15 by evacuating the inside of a closed space surrounded by the inner wall 12, the outer wall 13, and the membrane 14 can be formed. Reference numeral 37 denotes a base for forming the vacuum exhaust port 36, which is also formed of JIS SUS304 stainless steel or the like. Reference numeral 38 denotes a lid for closing the evacuation port 36 after evacuation.

With such a configuration, the vacuum insulated container 1
Since the face plates 22, 23, and 24 forming the inner wall 12 and the outer wall 13 are attached to the frame member 16 forming the edge portion by a welded portion 26 by laser seam welding or the like, these face plates 22, 23, and 24 are formed. As long as it can be welded to the frame member 16 in this manner, these face plates 22,
It is not necessary to form the vacuum insulated container 11 by assembling 23 and 24 with each other by vacuum tight welding. For this reason, the frame members 16 as the face plates 22, 23, 24
Even if a material much thinner than the thickness of the angle material is used, welding can be performed without any problem, and the vacuum insulated container 11 can be configured. For example, when the SUS304 stainless material having a thickness of 3 mm is used as the angle material of the frame member 16 and the SUS304 stainless material is similarly used as the face plates 22, 23, and 24, the thickness of the face plates 22, 23, and 24 is reduced. Even if it is as thin as about 0.3 mm, sufficiently tight vacuum tight welding can be performed. In this case, even in this case, the membrane 14
It is appropriate to set the thickness to about 0.5 mm in view of its strength.

Further, since the outer surface 20 of the angle member of the frame member 16 is configured to be in the same direction as the outer surface of the frame member 16, that is, the outer surfaces of the rectangular box-like inner wall 12 and outer wall 13, the angle member Can be welded with the face plate 22, 23, 24 placed thereon after the outer surface 20 of the is placed upward. In this way, these face plates 2 are welded on a flat surface and downward.
Since 2, 23 and 24 can be welded to the frame member 16, this also makes it possible to perform highly reliable vacuum tight welding.

In addition, since laser seam welding can be applied, when the above-described material is used, the welding speed can be set to, for example, 1.5 m / min or more, and high-speed welding can be performed. For this reason, manufacturing costs can be reduced. In addition to the laser seam welding, fillet welding and the like can be applied.

The edge 25 of the bottom face plate 22 and the side edge 27 and the lower edge 28 of the short side face plate 23 and the long side face plate 24 all constitute the frame member 16. Since it is configured to be recessed inward from the corner portion 19 of the material, that is, the edges 25, 27, and 28 of the face plates 22, 23, and 24 all constitute the edge portion of the vacuum heat insulating container 11. Since the edge portions are formed by the corner portions 19 of the angle members of the frame member 16 assembled in advance, even if the dimensional accuracy of these face plates 22, 23, 24 is low, there is no problem, and The vacuum heat insulating container 11 can be configured with required dimensional accuracy.

A vacuum exhaust port 3 is provided on one short side surface plate 23A.
When attaching a base 37 for forming the TIG 6, it is appropriate to perform TIG welding instead of laser seam welding.
It can be made of a material that is thicker than the other face plates so that welding is possible. The same applies to the case where other components other than the base 37 are attached. That is, the thickness of each face plate can be arbitrarily selected according to the application, and thus a highly reliable and high-quality vacuum heat insulator can be manufactured.

FIG. 7 shows another structure of the membrane 14.
That is, in the above-described example, the membrane has a J-shaped cross section, but in the example of FIG. 7, the membrane has a Z-shaped cross section. Also in this case, the membrane 14 and the inner wall 12
And the face plates 23 and 24 of the outer wall 13 are joined to each other at a welded portion 34 by laser seam welding. The same applies to the point that the membrane 14 is positioned by the edge end 21 of the frame member 16.

FIG. 8 shows another example of a welded portion by laser seam welding. That is, in the above example, the welded portion 26,
34 was constituted by one straight line,
Here, a pair of corrugated welding portions 38a and 38b are configured to cross each other. In this way, by forming the welded portions 38a and 38b that are multiple and cross each other,
The vacuum tightness can be further improved.

[0024]

As described above, according to the present invention, in a vacuum heat insulator having a vacuum heat insulating space between a pair of walls, an edge portion of the vacuum heat insulator is formed by a frame member. Since the face material constituting the wall is attached, it is sufficient that the face material can be attached to the frame member by welding or the like. For example, a material that is much thinner than the thickness of the frame member as a face material by laser seam welding or the like is used. In this case, highly reliable vacuum-tight welding can be performed. In addition, since laser seam welding can be applied, welding can be performed at a high speed.

[Brief description of the drawings]

FIG. 1 is a front sectional view showing a structure of a vacuum heat insulator according to an embodiment of the present invention.

FIG. 2 is a sectional view of a portion shown in FIG. 1 in a plan view.

FIG. 3 is a perspective view of a frame member in FIGS. 1 and 2;

FIG. 4 is a front view of the vacuum heat insulator shown in FIG. 1;

FIG. 5 is a bottom view of the vacuum insulator.

FIG. 6 is a perspective view of a main part of the vacuum heat insulator.

FIG. 7 is a view showing another example of the membrane in the vacuum heat insulator.

FIG. 8 is a view showing another example of a welded portion in the vacuum heat insulator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 12 Inner wall 13 Outer wall 15 Vacuum insulation space 16 Frame member 22 Bottom face plate 23 Short side face plate 24 Long side face plate 26 Welded part

Claims (1)

[Claims] 1. A vacuum heat insulator in which a space between a pair of wall portions is a vacuum heat insulating space, an edge portion of the vacuum heat insulator is formed by a frame member, and a face member constituting the wall portion is attached to the frame member. The structure of a vacuum heat insulator characterized by that.