KR20230010059A - A refrigerator comprising a vacuum space - Google Patents

Abstract

The present invention relates to a refrigerator including a vacuum space part, and more specifically, to a refrigerator capable of improving the insulation function of the refrigerator by forming a vacuum space part between an outer case and an inner case constituting a main body. The refrigerator including a vacuum space part according to the present invention comprises a main body including a storage space in which predetermined storage items can be accommodated. The main body includes: an inner case having the storage space formed therein; an outer case accommodating the inner case and arranged to be spaced apart from the inner case by a predetermined interval; a vacuum space part provided between the inner case and the outer case, and having the inside thereof sealed tightly to be maintained in a vacuum state, thereby performing an insulating function between the inner case and the outer case; a first supporting plate provided on one of the surfaces of the inner case and the outer case facing each other; and a plurality of spacers arranged and fixed to the first supporting plate and supporting to maintain the interval between the inner case and the outer case.

Description

A refrigerator comprising a vacuum space

The present invention relates to a refrigerator having a vacuum space, and more particularly, to a refrigerator capable of improving the insulation function of the refrigerator by forming a vacuum space between an outer case and an inner case constituting a main body.

A refrigerator is an electrical appliance capable of refrigerating or freezing storage by maintaining the temperature of a storage compartment at a temperature above or below zero using a refrigerant cycle.

Looking at the general configuration of a refrigerator, it includes a main body in which a storage space capable of storing stored objects is formed, and a door that is rotatably disposed or slidably disposed in the main body to open and close the storage space.

The main body includes an inner case in which a storage space is formed and an outer case in which the inner case is accommodated, and a heat insulating material is disposed between the inner case and the outer case.

The influence of the temperature in the storage space by the external temperature is suppressed by this heat insulating material.

Urethane foam is widely used as the heat insulator, and liquid urethane is injected into the space between the inner case and the outer case to be foam molded.

However, in order to realize the insulation effect using the insulation material, the thickness of the insulation material must be secured to a certain extent, which means that the insulation material becomes thicker. It gets bigger.

However, recently, a trend of miniaturization of refrigerators has emerged, and a need for a structure capable of reducing the external size while increasing the volume of the internal storage space has appeared.

US Patent Publication US2000882 (1935.05.07.)

The present invention has been made to solve the above conventional problems, and an object of the present invention is to provide a refrigerator capable of enhancing the insulation effect by forming a vacuum space between an inner case and an outer case, while minimizing the external volume. there is.

In addition, an object of the present invention is to provide a refrigerator having a support structure capable of maintaining a gap between the inner case and the outer case without being deformed by an external impact while a vacuum space is formed between the inner case and the outer case.

A refrigerator having a vacuum space of the present invention for achieving the above object includes a main body having a storage space in which a predetermined storage can be accommodated, and the main body includes an inner case in which the storage space is formed inside. Wow; an outer case which accommodates the inner case and is spaced apart from the inner case by a predetermined distance; a vacuum space part provided between the inner case and the outer case, the inside of which is sealed and maintained in a vacuum state to perform an insulating action between the inner case and the outer case; a first support plate provided on one of the surfaces of the inner case and the outer case facing each other; It is characterized in that it comprises a plurality of spacers fixedly disposed on the first support plate and supporting to maintain a distance between the inner case and the outer case.

The main body preferably further includes a second support plate provided on any other surface of the inner case and the outer case facing each other and disposed to face the first support plate.

Preferably, the second supporting plate includes a plurality of grooves formed on an inner surface of the second support plate so that ends of the plurality of spaces are inserted.

The plurality of spacers are preferably arranged in a plurality of rows vertically and horizontally.

It is preferable that the ends of the plurality of spacers have a convex curved shape.

It is preferable that the plurality of grooves of the second support plate have a concave curved surface shape corresponding to the shape of the plurality of spacers.

Preferably, the spacer, the first support plate, and the second support plate are made of any one of metal, ceramic, and reinforced plastic.

In addition, the main body preferably further includes a metal coating portion for blocking radiative heat transfer on at least one side of an outer surface of the first support plate and an inner surface of the second support plate.

In addition, a plurality of perforations may be formed between the plurality of spacers to the inside of the edge of the first support plate.

In addition, the first support plate includes an edge portion and a perforation formed in a portion surrounded by a plurality of spacers disposed along the edge portion, and a plurality of first holes connecting the plurality of spacers in a first direction at the perforation portion. It may include a rib and a plurality of second ribs formed to cross the plurality of first ribs and connect the plurality of spacers in a second direction in the perforation.

Here, the first support plate may further include a plurality of reinforcing ribs connecting the plurality of spacers between the first rib and the second rib.

According to the refrigerator of the present invention described above, a vacuum space, which is not a normal heat insulating material, is formed between the inner case and the outer case, and the heat transfer between the inner case and the outer case is suppressed by the vacuum space, thereby performing an insulating action.

Since the thermal insulation effect in a vacuum state is significantly superior to that of conventional thermal insulators, the refrigerator according to the present invention has an advantage of superior thermal insulation compared to conventional refrigerators.

On the other hand, in the case of the vacuum space, insulation is performed as long as the vacuum state is maintained regardless of its thickness (interval between the inner case and the outer case). An increase in thickness leads to an increase in the size of the refrigerator.

Therefore, compared to conventional refrigerators, the refrigerator according to the present invention can reduce the size of the outer case while maintaining the same storage space, thereby contributing to compactness of the refrigerator.

Further, according to the refrigerator of the present invention, while a vacuum space is formed between the inner case and the outer case, the inner case and the outer case are not deformed by external impact and the distance between them can be maintained.

By providing a structure that can easily assemble the inner case and the outer case and supporting parts therebetween forming the vacuum space, workability is improved.

1 is a perspective view showing an example of a refrigerator according to the present invention.
2 is a partially cut-away perspective view showing an inner case and an outer case and supporting parts therebetween in the refrigerator according to the present invention.
FIG. 3 is a perspective view illustrating assembling the first support plate and the spacer and the second support plate in FIG. 2;
FIG. 4 is a perspective view illustrating a state in which the first support plate, the spacer, and the second support plate are assembled in FIG. 3 .
5 is a perspective view showing another embodiment of the first support plate.
6 is a perspective view showing another embodiment of the first support plate.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 shows an example of a refrigerator according to the present invention. FIG. 2 is a partially cut-away perspective view showing an inner case and an outer case and supporting parts therebetween in the refrigerator according to the present invention.

As shown in FIG. 1, the refrigerator according to the present invention includes a main body 1 in which a storage compartment is formed, a first door 4 rotatably provided on the left side of the main body 1, and the main body 1. It includes a second door 5 rotatably provided on the right side of.

Here, the first door 4 opens and closes the freezing compartment of the storage compartment, and the second door 5 opens and closes the refrigerating compartment of the storage compartment, but the present invention is not limited to the refrigerator having this structure.

That is, the refrigerator of FIG. 1 is a so-called side-by-side type refrigerator in which the freezing compartment is disposed on the left side and the refrigerating compartment is disposed on the right side. Applicable to refrigerators. In addition, it can be applied to a refrigerator having only a refrigerating compartment or a freezing compartment or a refrigerator further including a separate cooling compartment in addition to the refrigerating compartment and the freezing compartment.

Looking at the structure of the main body 1, the inner case 110 in which the storage space is formed to the inside; an outer case 120 accommodating the inner case and spaced apart from the inner case by a predetermined distance; a vacuum space part 130 provided between the inner case and the outer case, the inside of which is sealed and maintained in a vacuum state to perform an insulating action between the inner case and the outer case; a first support plate 160 provided on one of surfaces of the inner case 110 and the outer case 120 facing each other; A plurality of spacers 150 are fixedly disposed on the first support plate to maintain a distance between the inner case 110 and the outer case 120 .

The outer case 120 and the inner case 110 are disposed to be spaced apart from each other, and a separate heat insulating material is not disposed in this space, but only maintained in a vacuum state to perform an insulation function.

That is, as the vacuum space 130 is formed between the outer case 120 and the inner case 110, the medium mediating heat transfer between the inner case 110 and the outer case 120 is removed. keep

By doing so, it is possible to prevent the heat of the hot air outside the outer case 120 from being transferred to the inner case 110 and the inside thereof.

A plurality of spacers for maintaining a gap between the inner case 110 and the outer case 120 in order to maintain the shape of the vacuum space 130 between the inner case 110 and the outer case 120. (spacer) 150 is disposed. The plurality of spacers 150 are arranged and supported so as to maintain a distance between the inner case 110 and the outer case 120 .

A plurality of spacers 150 are to be fixed between the inner case 110 and the outer case 120, and as a structure for fixing them, the plurality of spacers 150 are attached to the first support plate 160. is placed on

The first support plate 160 may be provided to come into contact with any one of surfaces of the inner case 110 and the outer case 120 facing each other.

In FIG. 2 , the first support plate 160 is disposed to contact the outer surface of the inner case 110, but the first support plate 160 may be disposed to contact the inner surface of the outer case 120.

The body 1 further includes a second support plate 170 provided on any other surface of the inner case 110 and the outer case 120 facing each other and disposed to face the first support plate. desirable.

In the embodiment of FIG. 2 , the second support plate 170 is disposed to contact the inner surface of the outer case 120, and the plurality of spacers 150 are fixedly disposed on the first support plate 160 to It is supported to maintain a gap between the first support plate 160 and the second support plate 170.

Since the first support plate 160 is in contact with the outer surface of the inner case 110 and the second support plate 170 is in contact with the inner surface of the outer case 120, the plurality of spacers 150 are After all, it is supported to maintain the distance between the inner case 110 and the outer case 120 .

In the case of the embodiment shown in FIG. 2, the second support plate 170 is provided with a predetermined distance from the first support plate 160, but as shown in FIG. 1, the plurality of spacers 150 are integrally fixed Only the disposed first support plate 160 may be provided between the inner case 110 and the outer case 120 .

In the case where the second supporting plate 170 is not present, ends of the plurality of spacers 150 may be disposed to directly contact the inner surface of the outer case 120 .

Meanwhile, in FIG. 1 , the inner case 110 , the outer case 120 , and the spacer 150 are illustrated with the first support plate 160 and the second support plate 170 omitted for convenience.

Returning to the case where the second support plate 170 is also provided, the second support plate 170 includes a plurality of grooves 175 formed on an inner surface thereof so that the ends of the plurality of spaces 150 are inserted. desirable.

The plurality of grooves 175 formed in the second support plate 170 are provided to the spacers 150 when the second support plate 170 is overlapped with the plurality of spaces 150 integrally formed in the first support plate 160. position relative to it is fixed.

Since the inner case 110 and the outer case 120 constituting the main body 1 must form a vacuum space 130 therebetween, for example, the inner case forming one side of the main body 1 ( 110) and the outer case 120 should be integrally formed to have a size corresponding to the size of one side thereof.

On the other hand, the first support plate 160 and the second support plate 170 produce a unit having a predetermined size smaller than the inner case 110 and the outer case 120, and then the first support plate 160 and the second support plate 160. A plurality of sets in which the two support plates 170 are assembled facing each other with the spacer 150 interposed therebetween may be fabricated and assembled by inserting them between the inner case 110 and the outer case 120 .

Of course, the first support plate 160 and the second support plate 170 may be fabricated and assembled in the same size as the inner case 110 and the outer case 120 .

FIG. 2 shows only a part of the assembly structure between the inner case 110 and the outer case 120 as a laminated structure.

Next, with reference to FIGS. 3 and 4 , the structure and assembly method of the first support plate, the spacer, and the second support plate will be described in more detail.

3 is a perspective view showing assembling the first support plate, the spacer, and the second support plate, and FIG. 4 is a perspective view showing a state in which the first support plate, the spacer, and the second support plate are assembled.

As shown, the plurality of spacers 150 are preferably arranged in a plurality of rows vertically and horizontally.

The plurality of spacers 150 integrally formed and disposed on the first support plate 160 are arranged in rows in the vertical and horizontal directions, as shown in FIGS. 3 and 4 .

By arranging the plurality of spacers 150 in a plurality of rows, not only design and molding are easy, but also assembly work is easy, and the strength to withstand vacuum pressure or external impact within the vacuum space 130 after assembly is high. can get bigger

And, it is preferable that the ends of the plurality of spacers 150 have a convex curved shape.

As shown in the enlarged circle of FIG. 4 , by forming the end of the spacer 150 in a convex curved shape, the end of each spacer 150 fits into the groove 175 formed in the second support plate 170 during assembly. Since it is easily seated, assembly work can be much easier.

In addition, it is more preferable that the plurality of grooves 175 of the second support plate 170 have a concave curved shape corresponding to the shape of the plurality of spacers 150 .

Since the plurality of grooves 175 of the second support plate 170 are formed in a shape corresponding to the shape of the plurality of spacers 150, not only is positioning easy during assembly, but also the second support plate 170 remains stable after assembly. It can be fixed so that it does not move in a direction parallel to its surface.

The spacer 150, the first support plate 160, and the second support plate 170 may be made of any one of metal, ceramic, and reinforced plastic.

The spacer 150 is provided in the vacuum space 130 between the inner case 110 and the outer case 120, and the first support plate 160 and the second support plate 170 are provided in the inner case 110. and the outer case 120 are in contact with each other.

Therefore, it is necessary to minimize heat transfer from the outside of the outer case 120 to the inside of the inner case 110. can

Therefore, the spacer 150, the first support plate 160, and the second support plate 170 provided to come into contact between the inner case 110 and the outer case 120 are metal or ceramic materials having low thermal conductivity, respectively. , It is preferable to be made of any one of reinforced plastics.

Among them, since it is preferable to manufacture the spacer, etc. with a material having low thermal conductivity and excellent strength, it is more preferable to manufacture the spacer, etc., with ceramic or reinforced plastic rather than a metal having excellent strength but relatively high thermal conductivity among the materials.

Meanwhile, the main body 1 may further include a metal coating portion for blocking radiative heat transfer on at least one of the outer surface of the first support plate 160 and the inner surface of the second support plate 170 .

Although not shown in the drawing, the metal coating portion is coated with a metal on at least one side of the outer surface of the first support plate 160 and the inner surface of the second support plate 170, and the inner case 110 and the outer case ( 120) to minimize heat transfer by radiation.

Since metal has an excellent property of blocking radiative heat transfer, it is generally coated with a metal to minimize radiative heat transfer despite having relatively high thermal conductivity.

In order to minimize radiative heat transfer, it is preferable that the metal coating is provided on both the outer surface of the first support plate 160 and the inner surface of the second support plate 170 .

Hereinafter, two other embodiments of the first support plate will be described with reference to FIGS. 5 and 6 .

First, FIG. 5 shows a first support plate 260 in which a plurality of spacers 150 are integrally formed and disposed according to the second embodiment of the present invention.

The difference in this embodiment from the first support plate 160 according to the first embodiment described above is that the first support plate 260 has a plurality of perforations 262 between the plurality of spacers 150 toward the inside of the edge thereof. is formed

The reason why the plurality of perforations 262 are formed in the first support plate 260 is because of the vacuum pressure in the first support plate 260 in the vacuum space 130, so that fine atoms are formed on the surface of the first support plate 260. Alternatively, it is to prevent an outgassing phenomenon in which molecules protrude.

In other words, by reducing the surface area of the first support plate 260, the material itself that can cause outgassing is reduced.

Of course, by forming a plurality of perforations 262 in the first support plate 260, not only the material cost for forming the first support plate can be reduced, but also the weight thereof can be reduced.

As shown in FIG. 5 , since the plurality of spacers 150 are arranged in a plurality of rows vertically and horizontally, four vertexes of the plurality of perforations 262 are adjacent to the four spacers 150 . It consists of a rectangular shape positioned to

Of course, the shape of the perforation 262 is not limited to such a rectangular shape, and may be formed in other shapes such as a hexagon, an octagon, or an ellipse.

However, the plurality of perforations 262 are designed so that the first support plate 160 has sufficient strength to support the spacers 150 without interfering with the plurality of spacers 150 in consideration of the positions where the spacers 150 are disposed. will have to form

Also, the plurality of perforations 262 formed in the first support plate 160 are arranged inside the edge portion 261 of the first support plate 160 .

A first rib 263 connecting the two spacers 150 in the horizontal direction and a second rib 264 connecting the two spacers 150 in the vertical direction are formed between the plurality of perforations 262, there is.

As shown in FIG. 5 , the plurality of spacers 150 are disposed at points where the first ribs 263 and the second ribs 264 intersect or where two ribs intersect the edge portion 261. desirable.

The edge portion 261 of the first support plate 160 is preferably formed to have a width greater than that of the first rib 263 and the second rib 264 .

This is because the edge portion 261 forms the entire skeleton of the first support plate 160 and provides basic strength.

Also, the second support plate 170 shown in FIGS. 2 to 4 may also have a plurality of perforations, similar to the first support plate 260 shown in FIG. 5 .

In this case, it is preferable that the second supporting plate 170 has the same shape as that of the first supporting plate 260 . Of course, the plurality of grooves 175 described above may be formed in the second support plate 170 .

Finally, FIG. 6 shows a first support plate 360 in which a plurality of spacers 150 are integrally formed and disposed according to the third embodiment of the present invention.

The difference in this embodiment from the first support plate 260 according to the second embodiment described above is that the first support plate 360 is located inside the perforated part 362 surrounded by a plurality of ribs 363 and 364. It further includes a reinforcing rib 365 connecting two or more spacers 150 .

That is, in the third embodiment, the first support plate 360 includes an edge portion 361, a perforated portion 362 formed in a portion surrounded by a plurality of spacers 150 disposed along the edge portion, and the cloth. A plurality of first ribs 363 connecting the plurality of spacers in a first direction in the hole, and a plurality of first ribs 363 connecting the plurality of spacers in a second direction at the hole and crossing the plurality of first ribs. The second rib 364 may be included, but a plurality of reinforcing ribs 365 connecting the plurality of spacers between the first rib and the second rib may be further included.

For convenience, in the third embodiment, unlike the perforation 262 in the second embodiment, the perforation part 362 is formed in a rectangular area surrounded by a plurality of spacers 150 disposed along the edge part 361. As pointing to a portion, it is defined as pointing to a rectangular portion formed by imaginary outlines excluding the ribs 363, 364, and 365.

However, as a result, it will be understood that the first support plate 360 of the third embodiment has the same shape as the first support plate 260 of the second embodiment except for the reinforcing ribs 365 .

The reinforcing rib 365 may connect two spacers disposed in a diagonal direction among the plurality of spacers 150 . Therefore, the two reinforcing ribs 365 are formed to cross each other in the middle part.

In addition, if the plurality of spacers 150 are integrally formed to reinforce the strength of the first support plate 360, they are connected in a direction parallel to the first rib 363 or the second rib 364. It can be made in other forms, of course.

Since the above-described first support plates 160, 260, and 360 and the second support plate 170 are integrally formed regardless of their shape, they are preferably manufactured by being molded at once in a mold manufactured in a predetermined shape.

According to the refrigerator according to the present invention, it is very easy to assemble by inserting a plurality of spacers into the vacuum space between the inner case and the outer case, and can have a structure that can sufficiently withstand vacuum pressure.

In the above, preferred embodiments of the present invention have been described, but the scope of the present invention is not limited only to such specific embodiments, and those skilled in the art can properly within the scope described in the claims of the present invention. change will be possible.

1: body 4, 5: door
110: inner case (first embodiment) 120: outer case
130: vacuum space 150: spacer
160: first support plate 170: second support plate
175: groove 260: first support plate (second embodiment)
261: edge portion 262: perforation portion
360: first support plate (third embodiment) 361: edge
362: perforation 363: first rib
364: second rib 365: reinforcing rib

Claims (19)

An inner case having a storage space formed therein;
an outer case which accommodates the inner case and is spaced apart from the inner case by a predetermined distance;
a vacuum space part provided between the inner case and the outer case, the inside of which is sealed and maintained in a vacuum state to perform an insulating action between the inner case and the outer case; And
A support structure that maintains a gap between the inner case and the outer case without being deformed by vacuum pressure or external shock while a vacuum space is formed between the inner case and the outer case,
The inner case or the outer case includes a first portion extending in a first direction,
The support structure includes a first support plate including a portion extending in the first direction,
The first support plate is provided as a unit body having a predetermined size, and at least two unit bodies are provided, and the unit body extends to have a normal line in the same direction as the normal line of the inner case or the normal line of the outer case. The method of claim 1, wherein the inner case or the outer case includes a second portion extending in a second direction, which is a direction different from the first direction, and a corner portion formed by meeting the first portion and the second portion, ,
The unit body may include a first unit body including a portion extending in the first direction and the first unit body including a portion extending in the first direction. Including a second unit comprising a portion extending in the direction,
The unit body includes a third unit body including a portion extending in the second direction and a fourth unit body including a portion extending in the second direction. The refrigerator according to claim 1, wherein the first support plate is provided by assembling the at least two units or supported by each other. According to claim 1,
The refrigerator, characterized in that the unit body is smaller than at least one of the inner case and the outer case. According to claim 1,
At least two of the unit bodies are inserted between the inner case and the outer case. According to claim 1,
At least two of the unit bodies are assembled between the inner case and the outer case. An inner case having a storage space formed therein;
an outer case which accommodates the inner case and is spaced apart from the inner case by a predetermined distance;
a vacuum space part provided between the inner case and the outer case, the inside of which is sealed and maintained in a vacuum state to perform an insulating action between the inner case and the outer case; And
A support structure that maintains a gap between the inner case and the outer case without being deformed by vacuum pressure or external shock while a vacuum space is formed between the inner case and the outer case,
The inner case or the outer case includes a first portion extending in a first direction,
The support structure includes a first support plate including a portion extending in the first direction and a second support plate including a portion extending in the first direction,
The first support plate is disposed in the vicinity of the inner case to support the inner case, and the second support plate is disposed in the vicinity of the outer case to support the outer case;
The second support plate is provided as a unit body having a predetermined size, and at least two units are provided to include a first unit body and a second unit body, and the first unit body and the second unit body face the first support plate, respectively. Refrigerator placed. According to claim 7,
The refrigerator, characterized in that the second support plate is smaller than at least one of the inner case and the outer case. According to claim 7,
The second support plate is provided by assembling the at least two units or provided to support each other. An inner case having a storage space formed therein;
an outer case which accommodates the inner case and is spaced apart from the inner case by a predetermined distance;
a vacuum space part provided between the inner case and the outer case, the inside of which is sealed and maintained in a vacuum state to perform an insulating action between the inner case and the outer case; And
A support structure that maintains a gap between the inner case and the outer case without being deformed by vacuum pressure or external shock while a vacuum space is formed between the inner case and the outer case,
The inner case or the outer case includes a first portion extending in a first direction,
The support structure includes a first support plate including a portion extending in the first direction and a spacer including a portion extending in a second direction different from the first direction,
The first support plate is provided as a unit of a predetermined size, and the unit is provided in at least two pieces,
The support structure includes at least two sets of the at least two units assembled with the spacer, respectively, or
The unit body includes a portion provided as a flat surface having a predetermined thickness, and the spacer includes a portion extending in a thickness direction of the unit body. According to claim 10,
The first support plate is a refrigerator in which at least two units support each other. According to claim 10,
The refrigerator, characterized in that the unit body is smaller than at least one of the inner case and the outer case. According to claim 10,
A refrigerator provided so that the at least two sets are mutually supported. According to claim 10,
In the support structure, at least two sets are disposed on the same plane. An inner case having a storage space formed therein;
an outer case which accommodates the inner case and is spaced apart from the inner case by a predetermined distance;
a vacuum space part provided between the inner case and the outer case, the inside of which is sealed and maintained in a vacuum state to perform an insulating action between the inner case and the outer case; And
A support structure that maintains a gap between the inner case and the outer case without being deformed by vacuum pressure or external shock while a vacuum space is formed between the inner case and the outer case,
The inner case or the outer case includes a first portion extending in a first direction,
The support structure includes a first support plate including a portion extending in the first direction,
The first support plate is provided as a unit of a predetermined size, and the unit is provided in at least two pieces,
The inner case or the outer case has a predetermined thickness in the thickness direction of the vacuum space and is provided to include a surface extending in a first direction different from the thickness direction,
The unit body includes a portion having a predetermined thickness in the thickness direction of the vacuum space, and is provided to include a surface extending in a second direction different from the thickness direction,
The second direction in which the unit body extends includes the same portion as the first direction in which the inner case or the outer case extends, or
The surface of the unit body is arranged to face the surface of the inner case or the surface of the outer case,
The surface of the unit unit is placed parallel to the surface of the inner case or the surface of the outer case. According to claim 15,
The refrigerator, characterized in that the unit body is smaller than at least one of the inner case and the outer case. An inner case having a storage space formed therein;
an outer case which accommodates the inner case and is spaced apart from the inner case by a predetermined distance;
a vacuum space part provided between the inner case and the outer case, the inside of which is sealed and maintained in a vacuum state to perform an insulating action between the inner case and the outer case; And
A support structure that maintains a gap between the inner case and the outer case without being deformed by vacuum pressure or external shock while a vacuum space is formed between the inner case and the outer case,
The inner case or the outer case includes a first portion extending in a first direction,
The support structure includes a first support plate including a portion extending in the first direction and a spacer including a portion extending in a second direction different from the first direction,
The first support plate is provided as a unit of a predetermined size, and the unit is provided in at least two pieces,
In the support structure, after the unit body is manufactured, at least two of the unit units are assembled to the spacer and disposed between the inner case and the outer case. 18. The method of claim 17,
The plurality of spacers are formed in a shape protruding from one surface of the first support plate. 18. The method of claim 17,
The plurality of spacers are integrally provided with the first support plate.

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