JP2002115919A - Vacuum holding vessel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solid, light-weight and easily manufactured vacuum holding vessel having an entire structure capable of completely withstanding atmospheric pressure for a long period. SOLUTION: The cover plate 22 and the base plate 24 of the vacuum holding vessel 12 are entirely horizontally extended. In the side parts of the vessel, an airtight property is maintained by metallic plates 30. Cover peripheral edges 36 and base peripheral edges 42 are supported by side walls 28.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum holding container, and more particularly to a flat vacuum holding container used in a vacuum solar heat collecting apparatus.

[0002]

2. Description of the Related Art Solar heat has attracted attention as an alternative energy such as gas and oil, particularly as a clean and inexhaustible energy that is friendly to the natural environment. As a device using solar thermal energy, a vacuum solar heat collecting device used for a hot water supply device or the like is known. This vacuum solar heat collecting apparatus has a vacuum holding container, and has a heat receiving body (heat absorbing body) that absorbs solar heat inside.

[0003] Conventionally, as a vacuum holding container, a double-tube vacuum holding container in which cylindrical glass tubes having a reasonable shape for receiving atmospheric pressure are arranged in double is known. In such a container, a heat transport medium (for example, water) for transporting solar heat flows inside the inner glass tube, while the gap between the outer glass tube and the inner glass tube is evacuated. In general, in a vacuum solar heat collecting apparatus, heat transfer loss due to air can be ignored, and most of the energy loss is due to infrared rays (secondary radiation) radiated from the surface of the heat receiving body. The radiation loss is proportional to the radiation area for the same radiation efficiency. Therefore, if the heat receiving area for sunlight is the same, the cylindrical heat receiver has a larger radiation loss than the flat heat receiver. So, in terms of energy efficiency,
A solar heat collecting device in which the heat receiving body has a flat plate shape can be said to be ideal.

[0004]

Problems to be Solved by the Invention Japanese Patent Laid-Open No. 2000-055
JP-A-481 and JP-A-11-270912 disclose a solar heat collecting apparatus using a flat heat receiving plate (heat receiving body). The vacuum holding container in these devices is composed of a cover plate made of glass, and a metal base container having a bottom and side walls, and has a flat plate shape as a whole. Is provided with a flat heat receiving plate.

A large atmospheric pressure of, for example, 10 tons / m ² is applied to the cover plate and the base container in such a vacuum holding container. Therefore, the vacuum holding container as a whole needs to have a structure that can sufficiently withstand such atmospheric pressure.

Incidentally, in the vacuum holding container disclosed in the above two publications, as described above, the peripheral portion of the base container constitutes a side wall which rises and bends toward the cover plate side. A seal member is provided between the upper end portion of the side wall and the peripheral edge portion of the base container, whereby the airtightness inside the container is maintained.

In the above-mentioned base container, the side wall is configured to have a sufficient thickness compared to the bottom so as not to buckle.
The side wall and the bottom of the base container are formed integrally,
It takes a great deal of time to form only the side walls with a certain thickness. Therefore, the entire base container can be formed with a thickness, but this is not preferable from the viewpoint of reducing the weight of the container. Further, since stress concentrates on the bent portion of the base container, there is a problem from the viewpoint of strengthening the structure of the container.

An object of the present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a light-weight and easy-to-manufacture container that has a whole structure capable of sufficiently withstanding atmospheric pressure for a long period of time. Another object of the present invention is to provide a simple vacuum holding container.

It is another object of the present invention to provide a vacuum holding container having a high vacuum holding function.

[0010]

In order to achieve the above-mentioned object, a vacuum holding container used in a solar heat collecting apparatus according to the present invention is a transparent member which spreads in a horizontal direction as a whole, and has A cover plate having one joining surface, a base plate having a second joining surface at a peripheral portion, the member being a member arranged to face the cover plate and extending in the horizontal direction as a whole, and joined to the first joining surface. A first end, a second end joined to the second joint surface,
An intermediate portion connecting the first end portion and the second end portion, and provided between the cover plate and the base plate, and a seal member for maintaining airtightness in the container; And a supporting member.

[0011] According to the above configuration, the cover plate and the base plate have a simple structure that extends in the horizontal direction as a whole. Therefore, the cover plate and the base plate are reasonable for accommodating a flat heat-receiving plate, and the structure is simple. Because it is simple, it is easy to manufacture.

Further, the support member can receive the atmospheric pressure applied in the vertical direction of the container, and the seal member ensures the airtightness of the container. Therefore, conventionally,
The two functions of the side wall on the side of the container, the function of maintaining the airtightness of the container and the function of supporting the periphery of the cover plate and the periphery of the base plate can be separated.

Since the atmospheric pressure applied to the side of the container is generally weaker than the atmospheric pressure applied in the vertical direction of the container, the structure can be configured to sufficiently receive the atmospheric pressure even if the thickness of the sealing member is relatively thin.

[0014] Preferably, the cover plate is formed as a glass member. The base plate is configured as a metal member or the like. It is desirable that both the peripheral edge of the cover plate and the peripheral edge of the base plate have a flat structure extending in the horizontal direction. By making the peripheral portion flat, the area of the first joint surface and the second joint surface can be sufficiently secured, and the joint region of the seal member can be secured. Here, the term “joining” includes not only direct joining such as adhesives and welding, but also indirect joining such as a thin metal plate or a metal gasket between a sealing member and a joining surface. .

The support member includes a side wall, a support column, and the like.
The shape, the number, or the positions of the side walls or the support columns can be appropriately selected according to the materials and shapes of the cover plate and the base plate. Preferably, the support member includes a side wall that supports the periphery of the cover plate and the periphery of the base plate. In this way, near the periphery of the container,
Atmospheric pressure applied vertically to the container can be received by the side walls.

Preferably, the support member is provided on the atmospheric pressure side in the middle of the seal member. With such a configuration, the seal member can be protected from damage or the like by the support member. Also, the manufacture of the container is easy.

Preferably, the support member includes a cushioning material. In this case, the support member functions as having elasticity.

Preferably, the seal member is formed of a metal plate integrally formed from the first end to the second end. The length of the intermediate portion may be longer than the separation distance between the cover plate and the base plate, and the cross section may be formed in a U-shape, for example. By providing a margin in the length of the intermediate portion, airtightness can be reliably maintained even if the cover plate and the base plate move relative to each other.

In order to achieve the above object, the cover plate has at least one window having a curved portion. Further, the base plate has a bottom portion having at least one curved portion.

According to the above configuration, the transparent window or the bottom can be reinforced by the curved portion, and therefore, the overall rigidity of the vacuum holding container can be increased. Alternatively, since sufficient pressure resistance can be ensured even when the thickness of each member is reduced, the advantage of reducing the weight of the vacuum holding container can be enjoyed.

The curved portion has a shape in which a central portion is curved, and as will be described later, for example, a plate having an arch shape in a transverse direction cross section, or a plate having a shell structure in which a central portion is convexly curved. And the like. By having such a curved shape, the curved portion itself has a structure resistant to bending, twisting, and the like. Further, for example, by disposing a plurality of such curved portions, high rigidity can be exerted as a whole container. Also, since stress tends to concentrate at the ends and boundaries of the curved portion, it is desirable to support the portion with a support member.

Further, an excellent sealing function can be achieved by joining a seal member to the first joint surface or the second joint surface via a gasket member.

[0023]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a top view of a solar heat collecting apparatus 10 having a flat vacuum container according to an embodiment of the present invention. The solar heat collecting apparatus 10 includes a heat receiving unit 12 and a vacuum holding container 14 that houses the heat receiving unit 12.

The heat receiving unit 12 comprises a plurality of heat insulating containers 18 having a heat receiving plate 16 for receiving solar heat, and a pipe 20 connecting them. In the present embodiment,
Although three heat insulating containers 18 are provided, the number may be one. Water 100 is sealed in the heat insulating container 18 as a heat transport medium. In FIG. 1, the water injected by the upper left pipe 20 receives heat from solar energy while flowing through the inside of the heat insulating container 18, and is taken out as high-pressure steam from the lower pipe 20 in the figure (arrow in the figure). reference).

The heat receiving plate 16 is formed in a flat plate shape.
Therefore, heat radiation is small and energy efficiency is good.

The vacuum holding container 14 includes the cover plate 2
2, a vacuum holding container 1 including a base plate 24, a support plate 26, a side wall 28, and a metal plate 30 for sealing.
The inside of 4 is maintained in a vacuum.

The cover plate 22 has a substantially flat plate shape, and the length of one side is several meters. The base plate 24 has substantially the same size as the cover plate 22 and is provided to face the cover plate 22. The support plate 26 is provided between the cover plate 22 and the base plate 24 and supports them. The side wall 28 and the metal plate 30 are provided along the periphery of the vacuum holding container.

As will be described in detail later, the side walls 28 support the peripheral portions of the cover plate 22 and the base plate 24.
The metal plate 30 is a sealing member that is joined to the cover plate 22 and the base plate 24 and that maintains the airtightness of the inside of the vacuum holding container 14. The heat receiving unit 12
Is provided between the base plate 24 and the cover plate 22. The distance between the base plate 24 and the cover plate 22 is, for example, about 2 to 10 cm.

The support plate 26 has an elongated flat plate shape, and supports the cover plate 22 and the base plate 24 at both long sides. At a location where the pipe 20 intersects, a through hole 32 through which the pipe 20 can pass is provided. Further, the pipe 20 and the through hole 32 are in non-contact or in contact with each other via a heat insulating material, so that a heat insulating measure for the pipe 20 is taken.

FIG. 2 is a sectional view taken along line 2-2 'of FIG. The cover plate 22 includes a window portion 34 that transmits sunlight and a cover peripheral portion 36 provided around the window portion 34. The cover peripheral portion 36 has a flat structure extending in the horizontal direction,
A bonding surface 38 with the metal plate 30 is provided on the lower surface of the cover peripheral portion 36.
Is provided. The base plate 24 includes a bottom portion 40 and a base peripheral portion 42 provided around the bottom portion 40. The base peripheral portion 42 has a flat structure extending in the horizontal direction, and a joining surface 44 with the metal plate 30 is provided on the upper surface of the base peripheral portion.
Is provided.

The metal plate 30 has an upper end portion 46, a lower end portion 48, and an intermediate portion 50 connecting them, which are integrally formed.
The upper end 46 is joined to the joining surface 38 of the cover peripheral edge 36, and the lower end 48 is joined to the joining surface 44 of the base peripheral edge 42. The intermediate portion 50 is longer than the separation distance between the cover plate and the base plate, is formed with slack, and has a substantially U-shaped cross section. Further, the metal plate 30 is easily deformable, and the shape of the intermediate portion 50 can be freely deformed.

The side wall 28 is formed through cushioning members 52 and 54.
Supports the upper end 46 and the lower end 48 of the metal plate 30,
It is provided on the atmospheric pressure side of the intermediate section 50.

The window 34 of the cover plate 22 is made of a transparent member that transmits sunlight, such as glass. The window 34 is connected to a plurality of segments 56 (curved portions) having a curved shape whose central portion is bulged. In the present embodiment, the cross section in the short direction of each segment 56 has an arch shape, and the shape is uniform in the long direction. The boundary portion 58 to which each segment 56 is connected is also a segment 5
6, which are supported on the upper side 60 of the support plate 26.

The arch shape of the segment 56 concentrates stress caused by a vertical load on the cover plate 22 at the boundary portion 58. In this way, even if the thickness of each segment 56 is reduced, it can sufficiently withstand the atmospheric pressure. Further, the boundary portion 58 where the stress is concentrated is supported by the support plate 26. Therefore, the vacuum holding container can be made relatively lightweight as a whole, and its structure can be strengthened.

The base plate 24 is made of metal, glass, or the like to maintain the airtightness inside the vacuum holding container 14.

In this embodiment, the window portion 34 and the cover peripheral portion 36 are formed integrally, but those formed independently of each other are also one aspect of the present invention. Also, the bottom 40
The same applies to the base peripheral portion 42.

Next, the side structure of the vacuum holding container 14 will be described in detail with reference to FIG.

One surface 62 of the upper end 46 of the metal plate 30 is bonded to the bonding surface 38 provided on the lower surface of the cover peripheral portion 36 of the metal plate 30 via an adhesive 64. Also,
One surface 66 of the lower end portion 48 of the metal plate 30 is joined to the joining surface 44 provided on the upper surface of the base peripheral portion 42 via an adhesive 68.

The side wall 28 has a block shape with a large thickness, and has a substantially rectangular cross section. The upper surface 70 and the lower surface 72 of the side wall 28 are provided with cushioning materials 52 and 54, respectively, and the side wall 28 supports both ends 46 and 48 of the metal plate 30 via the cushioning materials 52 and 54. The upper surface 70 of the side wall 28 is joined to the lower surface 76 of the cushioning material 52 via an adhesive 74. Further, the lower surface 72 of the side wall 28 is joined to the upper surface 80 of the cushioning material 54 via an adhesive 78.

The other surface 82 of the upper end 46 of the metal plate 30 is joined to the upper surface 84 of the cushioning material 52 via an adhesive 86. The other surface 88 of the lower end 48 of the metal plate 30 is joined to the lower surface 90 of the cushioning member 54 via an adhesive 92.

The cover peripheral portion 36 and the base peripheral portion 42 both extend in the horizontal direction and are formed substantially flat, so that the areas of the joint surfaces 38 and 44 with the metal plate 30 can be secured, and the Over a vacuum. A thin metal plate 30 is sufficient. Generally, the cover plate 22 and the base plate 2
Since the distance between them is smaller than that of the size 4, the load due to the atmospheric pressure per unit length applied to the side is small, and the above-mentioned load is applied to the metal plate 30 via an adhesive. Plate 22, base plate 24,
This is because they are dispersed by members such as the side wall 28 and the like.

The side wall 28 is subjected to the atmospheric pressure applied in the vertical direction of the container, but since it is generally a very large force, it is desirable that the side wall 28 be formed of a hard member, for example, metal, plastic, or the like.

When the material of the side wall 28 and the material of the cover plate 22 or the material of the base plate 24 are different, a distortion of the thermal expansion coefficient occurs due to the difference in the material. Since the metal plate 30 has a small thickness and is easily deformed, the metal plate 30 can absorb the strain in accordance with the expansion and contraction of the material, so that no extra load is applied to the adhesive. Therefore, the vacuum holding container enables long-term use.

The cushioning material 5 is provided on the upper surface 70 and the lower surface 72 of the side wall 28.
By providing the two and 54, respectively, it is possible to provide the side wall 28 with an elastic action. In this way, vertical and horizontal strains due to, for example, external force and thermal expansion can be absorbed by the elastic action. Generally, the cover plate 22
Is often made of a glass member that is vulnerable to impact, and the side wall 28 is often made of a hard member. Therefore, by providing the cushioning members 52 and 54, the impact between the cover plate 22 and the side wall 28 can be reduced, and the cover plate 22 can be protected.

The side walls 28 provided with the cushioning members 52 and 54 support both end portions 46 and 48 of the metal plate 30, and the cover peripheral portion 36 and the base peripheral portion 42 are pressed by the atmospheric pressure. Therefore, the close contact state between the cover peripheral portion 38 and the upper end portion 46 of the metal plate 30 and between the base peripheral portion 42 and the lower end portion 48 of the metal plate 30 increase due to the action of the side wall 28.

If a gasket member is provided between the metal plate 30 and the cover plate 22 as described later, the airtightness of the vacuum holding container is further improved.

Further, even if there are minute irregularities existing between the thin metal plate 30 and the peripheral edge of the cover plate 22, the cushioning members 52 and 54 can uniformly press both of them without any gap.

The intermediate portion 50 connected to both ends 46 and 48 of the metal plate 30 has a substantially U-shaped cross section and is formed to swell inside the vacuum holding container. Since the metal plate 30 is easily deformed, the relative displacement between the cover plate 22 and the base plate 24 in the vertical and horizontal directions can be absorbed by the slackness of the intermediate portion 50. For example, the plates move relatively. However, the vacuum can be reliably maintained.

A hard material is preferable as the material of the side wall 28. However, a soft material to some extent, for example, a metal such as lead or tin, a non-hard material such as plastic, or a rubber may be used. Then, the above-described protection of the cover plate 22 or the function of airtightness of the container can be enjoyed, so that there is no need to particularly provide the cushioning members 52 and 54.

In this embodiment, the side wall 28 is formed integrally, but instead, a plurality of support members may be provided on the periphery of the container. This is because the airtightness of the container is held by the metal plate.

FIGS. 4 and 5 are views showing another shape of the side wall. Except for the side wall, the configuration is almost the same as that shown in FIG.

When the side wall is made of a hard material such as a metal, the inside of the side wall 96 may be hollow as shown in FIG. Further, as shown in FIG. 5, the side wall 98 may be formed so that the cross section becomes substantially I-shaped. In this case, the weight of the entire container can be reduced.

As described above, in the present embodiment, the cover plate 22 and the base plate 24 have a substantially flat plate-type structure, so that it is reasonable to accommodate the flat-type heat receiving plate 16 and to have a structure. Is simple, so that it is easy to manufacture.

Further, on the side of the vacuum holding container 14, the function of maintaining the airtightness of the vacuum holding container 14 and the function of supporting the peripheral portions of the cover plate peripheral portion 36 and the base plate 42 are separated, and the former is attached to the metal plate 30. The latter was placed on the side wall 28. By doing so, the structure can be strengthened and the vacuum holding function can be accumulated, so that a vacuum holding container that can withstand long-term use can be configured.

Next, a method for maintaining a vacuum using gasket means will be described with reference to FIGS.

FIG. 6 is a top view of the vacuum holding container 14 when a metal gasket is used as a means for increasing the vacuum holding.

A linear metal gasket 102 is provided along the periphery of the vacuum holding container 14 between the upper end 46 of the metal plate 30 and the cover periphery 36.

FIG. 7 is a partial sectional view of FIG. Except for the metal gasket 102, the configuration is substantially the same as that shown in FIG.

[0060] The metal gasket 102 is
6 is provided between the joining surface 38 and the upper end 46 of the metal plate 30. Here, the metal gasket 102 is formed of, for example, lead or the like, which is easily deformed to maintain airtightness. The upper end portion 46 of the metal plate 30 is supported from below by a supporting column, and a large pressure due to atmospheric pressure is applied to the cover peripheral portion 36 from above. Therefore, the metal gasket 102 is pressed and easily deformed, so that the inside of the vacuum holding container 14 can be kept airtight. Moreover,
Since the metal gasket is naturally pressed by the atmospheric pressure, the inside of the vacuum holding container 14 can be kept airtight for a long period with a simple configuration.

In this embodiment, the metal gasket is used between the cover plate 22 and the metal plate 30, but may be used between the base plate 24 and the metal plate 30.

The cover plate 22 of the vacuum holding container
Is a portion (curved portion) 10 having a curved shape as shown in FIG.
3 may be singular. The illustrated cover plate 22 has substantially the same arch shape as the segment shown in FIG. In addition, the curved shape is not limited to the above-described cross section in the specific direction having an arch shape. For example, it may have a dome shape or the like.

FIGS. 9 to 13 show another embodiment of the base plate and the cover plate.

FIG. 9 is a top view of a vacuum holding container 104 according to another embodiment of the present invention.

The cover plate 106 has a window 108 formed of a transparent material and a cover peripheral portion 110 surrounding the window 108.
It is composed of Although not shown, the base plate 112 includes a bottom portion 114 and a base peripheral portion 116.

The window 108 and the bottom 114 have a plurality of hexagonal segments 118 having a shell structure. The segments 118 are interconnected in a pattern that is two-dimensionally arranged without gaps.

FIG. 10 is a perspective view of the segment 118, and FIG. 11 is a sectional view of the segment 118. The segment 118 has a substantially hexagonal shape, and has a shell structure in which a central portion is expanded.

The shell structure is also referred to as a structure, and generally has a form in which a central portion has a convexly curved shape. Each segment (curved portion) having such a curved shape is more resistant to bending or load than a plate-shaped segment. When they are connected to each other and arranged as shown in FIG. 9, they exhibit high rigidity as a whole.

The shape of the shell structure is preferably a shape such as a quadrangle, a rhombus, a hexagon, etc., which can be interconnected and arranged without gaps.

FIG. 12 shows the vacuum holding container 104 shown in FIG.
FIG. In the structure of the vacuum holding container 104, the structure other than the cover plate 104 and the base plate 112 is substantially the same as the structure of FIG. 2, and the corresponding members are denoted by the same reference numerals and description thereof is omitted. Further, the heat receiving unit 12 is not shown in the drawing.

The window 108 of the cover plate 106 has a structure in which the shell structure swells outside the container. The bottom 114 of the base plate 112 also has a structure in which the shell structure swells outside the container.

The structure of the vacuum holding container 104 can be strengthened by supporting the boundary 120 between the segments in the window 108 where the stress is concentrated and the boundary 122 between the segments in the bottom 112 with the support columns 124.

In general, the shell structure at the window and the bottom,
Although the arrangement pattern of the segments may be different, by providing the arrangement pattern symmetrically, it is possible to enjoy the advantage that the boundary portion between the window and the bottom is symmetrically arranged, and the support pillar can be efficiently arranged. .

Since both the window 108 and the bottom 114 have a structure bulging outside the container, the cover plate 1
If the base plate and the base plate are made of, for example, a glass member that is more resistant to compressive stress than tensile stress, the vacuum holding container can be made strong.

FIG. 13 is a view showing another embodiment of a vacuum holding container having a shell structure.

The cover plate 106 includes a window portion 108 and a cover peripheral portion 110. The base plate 126 includes a bottom portion 128 and a base peripheral portion 130.

The cover plate 106 has a structure in which the shell structure swells outside the container. Also, the base plate 126
Is a structure in which the shell structure swells inside the container.

The bottom 128 has a structure swelling inside the container. Therefore, if the base plate 126 is made of a material such as metal, which is more resistant to tensile stress than compressive stress, the structure of the container can be strengthened.

In the above embodiment, the window portion and the peripheral portion of the cover are formed integrally, but it is also possible to form them independently. The same applies to the bottom and the periphery of the base.

[Related Art] For reference, glass may be generally used as a material of the side wall. In that case, the base plate and the side wall are integrally formed. Further, since the cover plate and the side wall can be directly and air-tightly joined, a metal plate is unnecessary in this case.

[0081]

As described above, according to the vacuum holding container of the present invention, the vacuum holding container is robust, lightweight and easy to manufacture, having a whole structure capable of sufficiently withstanding the atmospheric pressure for a long period of time. Can be provided. Further, a vacuum holding container having a high vacuum holding function can be provided.

[Brief description of the drawings]

FIG. 1 is a diagram showing a solar heat collecting apparatus including a vacuum holding container according to an embodiment of the present invention.

FIG. 2 is a perspective view of a cross section taken along line 2-2 ′ of the vacuum holding container.

FIG. 3 is a side sectional view of a vacuum holding container.

FIG. 4 is a side sectional view of a vacuum holding container when a side wall is hollow.

FIG. 5 is a side sectional view of a vacuum holding container in a case where a side wall has an I-shaped cross section.

FIG. 6 is a diagram showing a solar heat collecting device when a metal gasket is used.

FIG. 7 is a side sectional view of a vacuum holding container when a metal gasket is used.

FIG. 8 is a diagram showing a vacuum holding container provided with only one curved portion.

FIG. 9 is a view showing a vacuum holding container having a shell structure.

FIG. 10 is a diagram showing a segment having a shell structure.

FIG. 11 is a sectional view of a segment having a shell structure.

FIG. 12 is a sectional view of a vacuum holding container having a shell structure.

FIG. 13 is a cross-sectional view of a vacuum holding container having a shell structure.

[Explanation of symbols]

22 cover plate, 24 base plate, 26
Support pillar, 28 side wall, 30 metal plate, 34 window, 36
Cover periphery, 40 bottom, 42 base periphery, 4
6 upper end, 48 lower end, 50 middle, 52, 54
Cushioning material, 56,118 segments, 102 metal gasket, 103 bend.

Claims (8)

[Claims] 1. A vacuum holding container used for a solar heat collecting device, comprising: a cover member having a first joining surface on a peripheral portion, the cover member being a transparent member that is generally spread in a horizontal direction, and facing the cover plate. A base plate having a second joining surface at a peripheral edge thereof, a first end joined to the first joining surface, and a member joined to the second joining surface. A second end portion, an intermediate portion connecting the first end portion and the second end portion, and a sealing member for maintaining airtightness in the container; and between the cover plate and the base plate. And a supporting member for supporting them. 2. The vacuum holding container according to claim 1, wherein the support member is a side wall provided between a peripheral edge of the cover plate and a peripheral edge of the base plate. 3. The vacuum holding container according to claim 2, wherein the support member is provided on an atmospheric pressure side of the intermediate portion. 4. The vacuum holding container according to claim 1, wherein the support member includes a buffer member. 5. The vacuum holding container according to claim 1, wherein the sealing member is a thin metal plate integrally formed from the first end to the second end. 6. The vacuum holding container according to claim 1, wherein the cover plate has a window having at least one curved portion. 7. The vacuum holding container according to claim 1, wherein the base plate has a bottom portion having at least one curved portion. 8. The vacuum holding container according to claim 1, wherein at least one of between the first joint surface and the first end or between the second joint surface and the second end. A vacuum holding container comprising a gasket member provided between the two.