JP2000245630A - Vacuum double vessel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent heat dissipation by contact by preventing an inner vessel and an outer vessel from being brought into contact by the external force of an impact and vibration, etc., and to provide a more small-sized vacuum double vessel by reducing a clearance between the outer vessel and the inner vessel. SOLUTION: This vacuum double vessel is composed by vacuuming the clearance 4 formed by the inner vessel 1A and the outer container 1B and making the clearance 4 as small as possible. The joined part 1C of prescribed length is formed by joining the upper end of the inner vessel 1A and the upper end of the outer vessel 1B and a rugged part 10 for reducing the clearance 4 between the inner vessel 1A and the outer vessel 1B is formed near the joined part 1C.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a vacuum double container such as a metal thermos or electric pot.

[0002]

2. Description of the Related Art Conventionally, (a) a vacuum double container such as a metal thermos, which is generally used, in which a vacuum is formed between a bottomed cylindrical inner container and a bottomed cylindrical outer container. In this method, the entire periphery of the opening of the inner and outer containers is welded, and the inner container is suspended in the outer container at the welded edge. When the gap between the inner and outer containers, that is, the separation distance, is reduced, the inner container is hung in the outer container and is in an unstable support state as described above. Due to variations in the manufacturing process,
The inner container comes into contact with the outer container. Due to this contact, heat in the container body is released to the outside from the contact portion, so that the heat retaining effect is reduced.

[0003] Therefore, the gap (separation distance) between the inner container and the outer container is, as described above, such that the inner container is configured to be suspended in the outer container, variation in the manufacturing process, impact during use, and the like. In consideration of external force and the like, a relatively large gap (separation distance) of about 4 to 5 mm or more has to be taken so that the inner container and the outer container do not come into contact with each other.

Accordingly, in the vacuum double container of the conventional example (a), as described above, since the relatively large gap is provided between the inner container and the outer container, the diameter of the outer container becomes large, and the vacuum double container becomes large. There is a problem that the overall external dimensions are large and heavy.

[0005] As a vacuum double container which solves such a problem, (b) a vacuum double container described in Japanese Patent Publication No. 6-24497 has been proposed. The above-mentioned Tokuhei 6-24497
In the vacuum double container described in the publication, the gap between the inner bottle (inner container) and the outer bottle (outer container) is set within a range of elastic deformation of the outer bottle (outer container) with respect to a radial load. .
Therefore, according to the vacuum double container described in JP-B-6-24497, the diameter of the outer bottle (outer container) can be made smaller than that of the vacuum double container of (a), and the entire vacuum double container can be reduced. The external dimensions will also be smaller and smaller.

In the vacuum double container described in Japanese Patent Publication No. Hei 6-24497, the gap between the inner bottle and the outer bottle is set within the range of elastic deformation of the outer bottle, so that the shock and vibration during use are reduced. Even if an external force such as that described above is applied, the outer bottle does not undergo plastic deformation, so that there is no contact between the outer bottle and the inner bottle, and the heat retention will be maintained.

[0007]

However, in the vacuum double container described in Japanese Patent Publication No. Hei 6-24497, one of the main causes of the contact between the outer bottle and the inner bottle is that the inner bottle is in contact with the outer bottle. It is suspended in a suspended shape with the rim weld as a fulcrum,
No consideration is given to the inadequate support of the inner and outer bottles at this edge weld. For this reason, in the vacuum double container described in Japanese Patent Publication No. 6-24497, even when the outer bottle is within the range of elastic deformation, the suspended inner bottle is not affected by the application of external force such as shock or vibration during use. There is a problem that the outer bottle and the inner bottle are in contact with each other while an external force is being applied, and the heat is radiated and the heat retaining effect is reduced.

The present invention is intended to solve the problems of the above conventional examples (a) and (b). Even if the outer container is within the range of elastic deformation, the suspended inner container can be welded by the lip. Part and the uneven part or the stepped part as a fulcrum so as not to contact the inner wall of the outer bottle to improve the heat retaining effect, reduce the gap between the outer container and the inner container, and It is intended to provide a vacuum double container.

[0009]

In order to achieve the above object, a first aspect of the present invention is to provide a vacuum pump having a vacuum formed between an inner container and an outer container and having the gap as small as possible. A heavy container, in which the upper end of the inner container and the upper end of the outer container are joined to form a joint having a predetermined length, and a gap between the inner container and the outer container is reduced near the joint. Characterized by the formation of an uneven portion or a step portion.

Here, the joint between the upper end of the inner container and the upper end of the outer container is formed by welding as is generally performed, but other methods may be used if the gap between the inner and outer containers can be evacuated. Good. In addition, the vicinity of the joint portion usually means near the portion where the joint portion (weld portion) is avoided, but in the present invention, the joint portion may be partially included and should be understood in a broad sense.

Further, the concave and convex portions for reducing the gap between the inner container and the outer container include only concave portions, only convex portions, or both concave and convex portions. The specific shape of the concave portion or the convex portion is not particularly limited in the present invention, and examples thereof include the following.

That is, as the convex portion of the concave / convex portion, there is a bead or a screw thread (see claim 3). In this case, the thread is preferably formed by simultaneously threading the inner container and the outer container (see claim 4). By forming a screw thread as the convex part as in the former, the screw thread can also be used as a screw for screwing the stopper or the cup and the outer lid. Also, as in the latter case, the thread is formed by screwing both the inner and outer containers at the same time, so that the tightness of the inner and outer containers is strengthened, the processing dimensions are stable, the strength is improved, and the processing cost is low. Since the size in the vertical direction can be shortened, a compact and lightweight vacuum double container can be provided.

The concave portion of the uneven portion may be a bead, a screw groove, a helicoid, or the like (see claim 5).

In order to reduce the gap between the inner and outer containers, a stepped portion may be used in addition to the above-mentioned uneven portion. The uneven portion or the step portion may be formed at the upper ends of the inner and outer containers in an annular shape such as a ring shape or a spiral shape, or may be formed as a part at one or a plurality of positions, and may be appropriately selected. .

According to a sixth aspect of the present invention, there is provided a vacuum double container wherein the gap formed between the inner container and the outer container is evacuated and the gap is made as small as possible. It is characterized in that the protrusion is a protrusion having a small diameter at the bottom, and a protrusion protruding from the inner surface of the bottom of the outer container is brought close to the outer peripheral wall of the protrusion.

[0016]

According to the vacuum double container of the present invention, since a joining portion for joining the upper end of the inner container and the upper end of the outer container is formed and an uneven portion or a step portion is formed near the joining portion, The inner container is firmly hung from the outer container not only at the portion (welded portion) but also at two places of the uneven portion or the step portion formed near the joint. Therefore, the inner container does not come into contact with the outer container even by an external force such as impact or vibration, and heat radiation due to the contact is prevented. In addition, the gap between the inner and outer containers can be made smaller than before by the concavo-convex portion or the step portion, and the outer shape of the outer container can be made smaller, so that the outer dimensions of the entire vacuum double container can be reduced, so that a compact vacuum double container can be provided. .

Further, according to the present invention, the bottom of the inner container is formed as a projection having a small diameter, and a raised portion projecting from the inner surface of the bottom of the outer container is brought into close proximity to the outer peripheral wall of the projection. Therefore, when an external force such as impact or vibration is applied to the vacuum double container, the protrusion on the bottom of the inner container instantaneously becomes a point or line on the protrusion protruding from the bottom of the outer container. Therefore, heat radiation due to the contact is almost prevented. Moreover, since the bottom of the outer container is also used as a steadying member for the inner container, a dedicated member for steadying is not required.

[0018]

First Embodiment A first embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a longitudinal sectional view of a double container constituting the vacuum double container in the above-described embodiment, and FIG. 2 is an enlarged view near a joint (edge welded portion) between the inner and outer containers.

The vacuum double container 1 has a bottomed cylindrical inner container 1A made of a metal such as stainless steel or iron, and a bottom 2 made of a metal such as stainless steel or iron. And outer container 1B joined by welding
To form a double container, the upper ends (mouth edges) of the inner and outer containers 1A and 1B are joined to each other by welding or the like to form a joint portion (mouth edge welded portion) 1C of a predetermined length, and the inner and outer containers are formed. 1A,
By evacuation of the gap 4 formed between 1B, the gap 4 is used as a vacuum heat insulating space. A plug 6 is fitted into the plug hole 5 at the opening of the vacuum double container 1 as shown in FIG. 3, and a shoulder 7 of the vacuum double container 1 (outer container 1B). As shown in FIG. 3, an outer lid 9 also serving as a cup is screwed into the threaded portion 8 formed in the above. Therefore, in FIG. 1, the illustration of the plug 6 and the outer lid 9 is omitted.

In the vicinity of a joint 1C where the upper end of the inner container 1A and the upper end of the outer container 1B are joined by welding or the like, the inner container 1
An uneven portion 10 for reducing the gap 4 between A and the outer container 1B is formed.

In the present embodiment, the projections 11 of the projections and depressions 10 are formed by simultaneously beading the interior and exterior containers 1A and 1B below the joining portion 1C of the interior and exterior containers 1A and 1B. A bead 12 is formed. The formation of the bead 12 is performed through the following steps. That is, the inner container 1A is inserted from below the outer container 1B (in a state where the bottom body 3 is not attached) and the inner and outer containers 1A, 1B are inserted.
After temporarily setting B, the lower position near the joint 1C is pressed by a press or the like to form an outward bead 12, and the edges of the inner and outer containers 1A and 1B are welded 13 (see FIG. 2). To form a joint 1C. Alternatively, the inner and outer containers 1A, 1
After temporarily setting B, the edges of the inner and outer containers 1A and 1B are welded 13 to form a joint 1C. Further, as described above, the lower position of the joint 1C is pressed by a press or the like to be directed outward. A bead 12 is formed.

In this embodiment, one bead 12 is formed in an annular shape, but a plurality of beads may be formed, and one or a plurality of partial beads may be formed at the upper ends of the inner and outer containers. You can also.

After the bead forming operation is completed, the bottom 2 of the outer container 1B (the outer container body 1B1) and the bottom 3 of the outer container 1B are welded, and the gap 4 between the inner container 1A and the outer container 1B is welded. The inside of the gap 4 is evacuated to a vacuum, the bottom plate 16 is fixed to the lower portion of the outer container 1B to cover the bottom body 3, and the stopper 6 is inserted into the stopper hole 5 as shown in FIG. By covering the outer lid 9, a vacuum double container is completed.

Reference numeral 17 denotes a sealing material for sealing the exhaust port 18, and reference numeral 19 denotes a getter material for burning the vacuum 4 in the gap 4 between the inner and outer containers 1A and 1B to improve the degree of vacuum.

[0025]

Second Embodiment A second embodiment of the present invention will be described below with reference to FIG. FIG. 3 is a longitudinal sectional view of the entire vacuum double container. The vacuum double container 1 of this embodiment has a bottomed cylindrical inner container 1A made of metal and a bottom 2 made of metal and joined to the bottom 3 by welding or the like, similarly to the above embodiment. A double container is formed with the outer container 1B, and upper ends (edge portions) of the inner and outer containers 1A and 1B are joined to each other by welding or the like to form a joint portion (edge weld portion) 1 having a predetermined length.
C, and the gap 4 formed between the inner and outer containers 1A and 1B is evacuated by vacuum to make the gap 4 a vacuum insulation space. The outer cover 9 is screwed into a screw portion 8 formed on the shoulder portion 7 of the outer container 1B.

The feature of this embodiment is that the protrusions 11 of the concavo-convex portions 10 formed in the vicinity of the joint 1C are formed as threads 22.

The thread 22 is provided between the inner container 1A and the outer container 1
B is preferably formed by screwing at the same time. The method for forming the thread 22 is the same as the method for forming the bead 12. That is, after the inner container 1A is inserted from below the outer container 1B (in a state where the bottom body 3 is not attached) and the inner and outer containers 1A and 1B are temporarily set, the lower position near the joint 1C is set to a screw machine or the like. To form a screw thread 22, and furthermore, weld 13 the edges of the inner and outer containers 1A, 1B to form a joint 1C. Alternatively, after temporarily setting the inner and outer containers 1A and 1B, welding the edges of the inner and outer containers 1A and 1B.
3 to form a joint 1C, and further, as described above, a screw thread 22 is formed below the joint 1C with a screw machine or the like.

In FIG. 3, the stopper 6 pushes down the pressing plate 24 to open the valve, and then tilts the container body, so that the content liquid is discharged from the spout 26 through the liquid passage 25. I have. Reference numeral 27 denotes a valve body which is seated on a valve seat 28 to be in a closed state, and 29 denotes a packing. In FIG. 3, the dimension L between the bottom outer peripheral wall of the inner container 1A and the upwardly protruding portion 30 formed near the outer periphery of the bottom body 3 of the outer container 1B is determined by the following formula.
The dimension M is substantially equal to or larger than the dimension M between the outer peripheral surface of A and the inner peripheral surface of the outer container 1B. By doing this,
Since the dimension M can be reduced, the vessel can be reduced in the radial direction, and a smaller vacuum double container can be provided.

[0029]

Third Embodiment A third embodiment of the present invention will be described below with reference to FIGS. FIG. 4 is a vertical sectional view of the entire vacuum double container, and FIG. 5 is a perspective view of the necks of the inner and outer containers. The vacuum double container 1 of this embodiment is formed of a bottomed cylindrical inner container 1A and an outer container 1B in which the bottom 2 is joined to the bottom 3 by welding or the like, as in FIG. 1
The upper ends of A and 1B are joined to each other by welding or the like to form a joint (mouth edge weld) 1C of a predetermined length.
The gap 4 between A and 1B is evacuated to make the gap 4
Is a vacuum heat insulating space, and the stopper 6, the outer lid 9, the bottom plate 16 and the like are provided. However, since the configuration is the same as that of FIG. For details, refer to the description of the second embodiment.

The feature of the embodiment of the present invention resides in that a bead 15 is formed inwardly in an annular shape as the concave portion 14 of the concavo-convex portion 10 formed near the joint 1C. Also in this case, the gap 4 between the inner container 1A and the outer container 1B is smaller than in the conventional case.

The method for forming the bead 15 is formed according to the method for forming the bead 12 of the second example of the embodiment. The difference between the formation methods of the beads 15 and 12 is that the beads 12 project outward while the beads 12 project outward.

As shown in FIG. 5, one bead 15 is formed in an annular shape, but a plurality of beads may be formed. Further, as shown in FIG. 6, a plurality of partial beads 15 can be formed near the joint 1C between the inner and outer containers 1A, 1B, or one partial bead can be formed. In addition, although not shown, a thread groove or a helicoid may be used, and may be appropriately selected.

[0033]

Fourth Embodiment A fourth embodiment of the present invention will be described below with reference to FIG. FIG. 7 is a longitudinal sectional view of the double container constituting the vacuum double container. In this embodiment, a step 40 is formed near the joint 1C where the upper end of the inner container 1A and the upper end of the outer container 1B are joined to reduce the gap 4 between the inner and outer containers 1A and 1B. The other configuration is the same as that of FIG.

That is, the upper edges of the inner and outer containers 1A and 1B are joined by welding 13 to form a joint 1C, and a substantially vertical portion 43 having a smaller diameter than the joint 1C below the lower end of the joint 1C. The step portion 40 is formed between the lower end of the joining portion 1C and the upper end of the substantially vertical portion 43. The step portion 40 may be formed by superposing the upper ends of the inner and outer containers 1A and 1B and pressing the upper end with, for example, a press. Therefore, the step portion 40 includes the step portion 41 of the inner container and the step portion 42 of the outer container.

[0035]

Fifth Embodiment A fifth embodiment of the present invention will be described below with reference to FIG. FIG. 8 is a vertical sectional view of the entire vacuum double container.

As shown in FIG. 3, the vacuum double container 1 of this embodiment has a bottomed cylindrical inner container 1A made of metal.
And the outer container 1B, which is also made of metal and the bottom portion 2 is joined to the bottom body 3 by welding or the like, to form a double container, and the upper ends (mouth edges) of the inner and outer containers 1A and 1B are joined by welding or the like. To form a joint (mouth edge weld) 1C of a predetermined length,
By evacuation of the gap 4 formed between the inner and outer containers 1A and 1B, the gap 4 is used as a vacuum heat insulating space, and a plug 6 is inserted into a plug hole 5 at the opening of the vacuum dual container 1. ,
An outer lid 9 also serving as a cup is screwed into a screw portion 8 formed on the shoulder portion 7 of the outer container 1B.

The feature of this embodiment is that a screw portion 23 is formed as the convex portion 11 of the concave and convex portion 10 formed near the joint portion 1C, and the outer lid 9 also serving as a cup is provided outside the screw portion 23 and the inside thereof. The plugs 6 are screwed together so that the screw portion 23 can be screwed to the outer lid 9 and the plug 6, and the screw portion 8 to which the outer lid 9 is screwed in FIG. The omitted structure is adopted. Moreover, the gap 4 between the inner container 1A and the outer container 1B is made smaller than in the prior art.

The screw portion 23 is preferably formed by, for example, polymerizing the upper end of the inner container 1A and the upper end of the outer container 1B and then pressing the upper end with a press or the like to form a screw. The method of forming the screw portion 23 may be the same as that of the second embodiment, and a detailed description thereof will be omitted. The upper portion of the vacuum double container is covered with the outer cover 9 by screwing the female screw portion 9a of the outer cover 9 to the outer screw portion 23a of the screw portion 23, and the inner screw portion 23b of the screw portion 23 is plugged. By screwing the male screw portion 6a of the body 6, the stopper hole 5 of the vacuum double container is covered.

As described above, the vacuum double container according to the fifth embodiment has a single screw portion for screwing the outer lid 9 serving also as a cup and the plug 6 near the edge joint of the inner and outer containers. 23, the following advantages are provided.

That is, the structure of the mouth portion of this type of vacuum double container currently used is, for example, as shown in FIG.
When viewed from the outside, the outer container 1B, the screw portion 8 for screwing the outer lid 9 of the outer container 1B, the screw portion for screwing the plug 6 of the outer container 1B (corresponding to 22 in FIG. 3), and the opening of the inner container 1A are closed. Valve seat 28
However, there is a problem that the dimension from the inner diameter of the vacuum double container to the neck (shoulder) of the outer container is increased due to the restriction in the radial direction.

On the other hand, according to the vacuum double container of the fifth embodiment, the size from the inner diameter of the vacuum double container to the neck (shoulder) of the outer container can be reduced as compared with the conventional product.
Since the outer diameter of the neck and the like of the outer container can be reduced, a small vacuum double container can be provided. In other words, the inner diameter of the inner container can be made larger than before in comparison with the outer diameter of the outer container. Further, according to the present embodiment, since the screw portion (8 in FIG. 3) for screwing the outer cover 9 of the outer container 1B is not required, the number of manufacturing steps is reduced and the production cost is reduced. Further, the size from the inner diameter of the double container to the neck (shoulder) of the outer container can be reduced, so that the outer lid 9 can be downsized.

[0042]

Sixth Embodiment A sixth embodiment of the present invention will be described below with reference to FIG. FIG. 9 is a longitudinal sectional view of a main part of the vacuum double container, and the upper half is omitted as it is configured as shown in FIG.

In the vacuum double container of the sixth embodiment, the bottom body 3 of the outer container 1B is used also as the steadying member 50. That is, the bottom of the inner container 1A is formed as a protrusion 1D having a small diameter, and an annular or partial protrusion 51 is protruded from the inner surface of the bottom body 3 so as to surround the outer peripheral wall 1D1 of the protrusion 1D. The raised portion 51 is connected to the inner container 1A.
In the vicinity of the outer peripheral wall 1D1. The outer peripheral wall 1D1 of the protruding portion 1D and the inner peripheral wall 51 of the raised portion 51 which is a steady member.
The dimension L1 between “a” is equal to or smaller than the dimension M1 between the outer peripheral surface of the inner container 1A and the inner peripheral surface of the outer container 1B.
Thereby, the vessel can be made smaller in the radial direction, and a smaller vacuum double container can be provided. Also, since the bottom body 3 is also used as a steady rest member without a dedicated member for steady rest,
Production costs are reduced.

As a method of reducing the gap 4 between the inner container 1A and the outer container 1B, as shown in FIG.
There is also a method of considerably lengthening a welding margin N of a joining portion (edge welding portion) 1C for welding the upper ends of the inner and outer containers 1A and 1B to each other. This also prevents the inner and outer containers 1A and 1B from contacting each other when external force such as impact or vibration is applied to the body, and achieves the desired effects such as providing a small vacuum double container. can do.

[0045]

According to the vacuum double container of the first aspect, a joining portion for joining the upper end of the inner container and the upper end of the outer container is formed,
Since the uneven portion or the step portion is formed in the vicinity of the joint portion, the inner container is connected to the outer container at the two portions of the uneven portion or the step portion formed near the joint portion to level only the joint portion (welded portion). On the other hand, it is firmly suspended. Therefore, the inner container does not come into contact with the outer container even by an external force such as impact or vibration, and heat radiation due to the contact is prevented. In addition, the gap between the inner and outer containers can be made smaller than before by the concavo-convex portion or the step portion, and the outer shape of the outer container can be reduced, so that the outer dimensions of the entire vacuum double container can be reduced, so that a small vacuum double container can be provided. .

According to the vacuum double container of the second aspect, the concave and convex portions or the step portions have advantages such as high strength when they are formed annularly at the upper ends of the inner and outer containers. Has the advantage that the material cost is lower than the former.

According to the vacuum double container of the third aspect, when a bead is used as the convex part of the concave and convex part, it is firmly fixed as the convex part and easy to manufacture. Further, by forming a screw thread as the convex part, the screw thread can be also used as a screw for screwing the stopper and the cup and the outer lid.

According to the vacuum double container of the fourth aspect, the thread as the convex portion of the concave and convex portion is formed by simultaneously screwing the inner and outer containers, whereby the inner and outer containers are in close contact with each other, and the processing is performed. The dimensions are stable, the strength is improved, the processing cost is low, and the vertical dimension can be shortened, so that a small and lightweight vacuum double container can be provided.

According to the vacuum double container of claim 5, there is an advantage that these beads, screw grooves and helicoids are easily formed as concave portions.

According to the vacuum double container of the sixth aspect, when an external force such as an impact or vibration is applied to the vacuum double container, the protrusion at the bottom of the inner container projects from the bottom of the outer container. It only momentarily contacts the raised portion in a point or linear manner, and heat radiation due to the contact is almost prevented. Moreover, since the bottom of the outer container is also used as a steadying member for the inner container, a dedicated member for steadying is not required.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view of a double container constituting a vacuum double container according to a first embodiment of the present invention.

FIG. 2 is an enlarged view of the vicinity of a joint (edge weld) of the inner and outer containers.

FIG. 3 is an overall vertical sectional view of a vacuum double container according to a second embodiment of the present invention.

FIG. 4 is an overall vertical sectional view of a vacuum double container according to a third embodiment of the present invention.

FIG. 5 is a perspective view of the necks of the inner and outer containers.

FIG. 6 is a perspective view of neck portions of both inner and outer containers showing a modification of the third embodiment of the present invention.

FIG. 7 is a vertical sectional view of a double container constituting a vacuum double container according to a fourth embodiment of the present invention.

FIG. 8 is an overall vertical sectional view of a vacuum double container according to a fifth embodiment of the present invention.

FIG. 9 is a longitudinal sectional view of a main part of a vacuum double container according to a sixth embodiment of the present invention.

FIG. 10 is a vertical sectional view of a main part showing another modified example for reducing the gap between the inner and outer containers.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vacuum double container 1A Inner container 1B Outer container 1C Joining part (mouth welding part) 3 Bottom body 4 Gap 6 Plug body 10 Irregularity part 11 Convex part 12 Bead 14 Concave part 15 Bead 16 Bottom plate 22 Thread 23 Screw part 30 Uplift Part 40 step part 50 steady rest member 51 raised part

Claims (6)

[Claims] 1. A vacuum double container wherein a gap formed between an inner container and an outer container is evacuated and the gap is made as small as possible, wherein an upper end of the inner container and an upper end of the outer container are connected to each other. A vacuum double container comprising: a joint having a predetermined length formed by joining; and a concavo-convex portion or a step portion for reducing a gap between the inner container and the outer container in the vicinity of the joint. . 2. The vacuum double container according to claim 1, wherein the concave / convex portion or the step portion is formed annularly or partially at the upper ends of the inner and outer containers. 3. The vacuum double container according to claim 2, wherein the convex portion of the concave / convex portion is a bead or a screw thread. 4. The vacuum double container according to claim 3, wherein the thread as a convex portion of the concave and convex portion is formed by simultaneously screwing the inner container and the outer container. 5. The vacuum double container according to claim 1, wherein the concave portion of the concave / convex portion is a bead, a screw groove, or a helicoid. 6. A vacuum double container in which a gap formed between an inner container and an outer container is evacuated and the gap is made as small as possible, wherein the bottom portion of the inner container has a reduced diameter. And
A vacuum double container wherein a raised portion protruding from the inner surface of the bottom of the outer container is brought close to the outer peripheral wall of the projecting portion.