JP2001128861A - Metallic vacuum double container and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a problem from being generated in terms of heat insulation by reducing a gap between inner and outer containers. SOLUTION: By fitting the projecting part 14c or recessed part 14b of a jig 14 to the recessed part 15 or the projecting part 13a successive around an axis Y formed on the bottom part 1c of the inner container 1, positioning it in a radial direction, putting the outer container 2 in an inverted state on the inner container 1 in the supported and positioned state by matching the axis Z with the jig 14, fitting the port part 2a of the outer container 2 to the port part 1a of the inner container 1 and then welding and joining the port parts 1a and 2a fitted together, the inner and outer containers 1 and 2 are integrated and supplied for vacuum evacuation and vacuum sealing thereafter.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum container made of metal and a method for producing the same, and is mainly used for a heat-insulating container for eating and drinking, for example, a portable or stationary or mug-type heat-insulating bottle, an electric pot, and a lunch jar. Metal vacuum double container to be used.

[0002]

2. Description of the Related Art Such vacuum double containers made of metal are required to have heat retention, small size, light weight, durability and the like. For this reason, stainless steel materials that are advantageous in heat insulating properties, have corrosion resistance, and can obtain the required strength even when they are relatively thin are widely used.

It is sufficient that the gap between the inner and outer containers is about 1 mm for vacuum insulation. However, if the inner and outer containers are deformed due to an external force or the like, the gap is narrowed and the inner and outer containers come into contact with each other, the heat retention is impaired.

FIGS. 10 and 11 show a conventional mug-type heat-insulating bottle. The main body a, which is a metal vacuum double container, is easily subjected to an external force when used, but the inner container is also used for cleaning. When washing, it may be subjected to an external force by a washing tool, and a lunch jar is easily affected by an external force because a rice container, a soup container, a vegetable container, etc. are put in.

In order to manufacture the main body a, an upward jig (not shown) enters the inverted inner container b and supports the inner container b by supporting the bottom thereof. The outer container c in an inverted state is covered with the two axes aligned, and the mouth c1 of the outer container c is fitted to the mouth b1 of the inner container b.
After the fitting, the inner and outer containers b and c are integrated by welding and joining the fitted mouth portions b1 and c1, and are subjected to vacuum evacuation and subsequent vacuum sealing.
The outer container c is placed on the inner container b supported by the jig in an inverted state in accordance with the axis of the jig, and the inner container b is positioned in the radial direction with respect to the jig to fit the mouths b1 and c1 together. Sometimes, the outer container c is displaced and interferes with the inner container b to deform each other.

In the stainless steel vacuum double container shown in FIGS. 10 and 11, the inner container b is formed into a shape having a bottom, then plated with Cu and washed, and the outer container does not have a bottom. After being formed into a cylindrical shape, Cu plating and washing are performed, and a bottom d is formed. Next, after the getter g and the sealing material holding member e are attached to the bottom d, the inner and outer containers b and c are combined and TIG welding is performed between their mouths, and the outer container c and the bottom d are TIG welded to each other. And vacuum sealing.

Conventionally, the outer diameter of the main body a was 72 mm, the thickness of the inner container b was 0.8 mm, and the thickness of the outer container c was 0.4 mm. , A gap of about 6 mm is set, and a sufficient result is obtained.

[0008]

However, the heat retention is 1 mm.
By setting the gap that is sufficient to about 6 mm, it is lightweight,
It is desired to further reduce the size and cost in terms of reduction.

SUMMARY OF THE INVENTION An object of the present invention is to provide a metal vacuum double container in which the gap between the inner and outer containers is reduced so that there is no problem in keeping heat, and a method of manufacturing the same.

[0010]

In order to achieve the above object, the metal vacuum double container of the present invention comprises a double combination of a metal inner container and an outer container, and the inner and outer containers. In which the inside of the inner container has a vacuum space formed between the inner and outer containers, the concave portion from the outer surface curved inward at the center at the bottom wall Is one of the features.

In such a configuration, the inwardly curved concave portion at the center of the bottom wall of the inner container is brought closer to the bottom of the outer container than before by the amount of reinforcement that increases the deformation strength of the bottom wall. The gap between them can be reduced, and the concave portion forms an inward convex portion at the bottom of the inner container, and at the stage of manufacturing the metal vacuum double container, the inner container is turned upside down and entered upward. When the bottom is supported by the jig, the inner container can be positioned in the radial direction regardless of the play for the jig to enter the inner container by fitting it into the recess at the upper end of the jig. That the inner and outer containers are not misaligned when fitting the two mouths by covering the inner container supported and positioned by this jig with the axis of the jig, and they will interfere and deform due to each other Preventing, between the body of divided inner and outer containers this deformation can be prevented can be moved closer than ever to reduce the gap.

Further, in the metal vacuum double container of the present invention, the metal inner container and the outer container are double-combined, and the inner and outer containers are integrally joined by an airtight joint at a fitting portion between their mouths. In the case where a vacuum space is formed between the inner and outer containers, both the bottom walls of the inner and outer containers have a concave portion from the outer surface curved inward at the center, and the concave portion of the outer container bottom has a vacuum at the bottom. Another feature is that it has an exhaust hole for exhaust and enters into a recess at the bottom of the inner container leaving a gap in which a vacuum space can be formed, and the exhaust hole is sealed with a sealing material.

In such a configuration, the concave portion curved inward at the center of the bottom wall of the inner and outer containers makes the bottom portions of the inner and outer containers closer to each other than before by the amount of reinforcement that increases the deformation strength of the bottom wall. While the gap between the two can be reduced, the sealing material does not flow out when the concave portion of the outer container is sealed with a sealing material that is hardened after the exhaust hole at the bottom is once melted, Further, even if the sealing material after curing is formed at a depth larger than the gap that can be made small enough to protect from external force in subsequent handling and use, the inwardly projecting portion of the concave portion of the outer container may be formed. Can enter the recess of the inner container and prevent the gap between the bottoms of the inner and outer containers from being reduced, thereby ensuring the evacuation and the formation of the vacuum space in the gap between the two recesses. In addition, the concave part of the inner container forms an inward convex part at the bottom of the inner container, and at the stage of manufacturing a metal vacuum double container, the inner container is inverted and the bottom is supported by an upward jig that has entered it. By fitting the jig into the recess at the upper end of the jig, the inner container can be positioned in the radial direction regardless of the play for the jig to enter the inner container. When the inner and outer containers are covered with the inner container supported and positioned by the leverage jig and the two mouths are fitted together, there is no displacement between the inner and outer containers, and they are prevented from interfering with each other and deforming. Therefore, the gap between the body portions of the inner and outer containers can be made closer to each other than before so that the gap can be reduced.

[0014] In addition to the metal vacuum double container, the bottom wall of the inner container may further have a recess from the inner surface that forms a step facing downward inside the outer peripheral portion with respect to the outside. .

[0015] In such a configuration, furthermore, this step portion is located continuously around the axis of the container at a portion near the outer periphery of the inner container, and in addition to the bottom portion of the inner container, the lower portion of the body portion of the inner container is also provided. Since the reinforcing member is reinforced, the gap can be reduced by bringing the bottom of the inner container and the lower end of the body closer to the bottom of the outer container and the lower end of the body than in the case described above. At the stage of manufacturing the heavy container, the inner container is turned upside down, and when the bottom is supported by the upward jig that has entered the inner container, it is fitted with the convex at the upper end of the jig, so that the jig enters the inner container. Regardless, the inner container can be positioned in the radial direction in a more stable support state by fitting near the outer periphery of the bottom, so that the outer container is aligned with the axis of the jig by this stable support and positioning. This jig There is no displacement between the inner and outer containers when the inner and outer containers are fitted over the supported and positioned inner container so that the two mouths are fitted together, and they are prevented from interfering with each other and being deformed, and this deformation can be prevented. The gap between the body portions of the inner and outer containers can be made smaller than in the above case to reduce the gap.

When the step is inside the minimum inner diameter position of the inner container, the inner container is supported by a jig having a size and a shape that can simply enter and exit the inner container, and a convex portion is fitted to the step. Can be positioned.

In the metal vacuum double container of the present invention, the metal inner container and the outer container are double-combined, and the inner and outer containers are integrally joined by airtight joining at a fitting portion between their mouths, Another feature is that in the case where a vacuum space is formed between the inner and outer containers, the bottom wall of the inner container has a recess from the inner surface which forms a step facing downward inside the outer peripheral portion with respect to the outside. .

In such a configuration, the step portion is located continuously around the axis of the container at a portion near the outer periphery of the inner container,
In addition to the bottom of the inner container, it also reinforces the lower part of the body of the inner container, so that the bottom of the inner container and the lower end of the body are closer to the bottom of the outer container and the lower end of the body than in the above case. The gap can be made small, and the step is the convex part of the upper end of the jig when the inner container is turned upside down and the bottom is supported by the upward jig that has entered it in the stage of manufacturing the metal vacuum double container. By fitting with the inner container, regardless of the play for the jig to enter the inner container, the inner container can be positioned in the radial direction in a more stable support state by fitting near the outer periphery of the bottom, With this stable support and positioning, the outer container is aligned with the axis of the jig and placed over the inner container supported and positioned by this jig. Prevents but such as to deform interfere with each other, between the body of divided inner and outer containers this deformation can be prevented it is possible to reduce the clearance is brought closer than the above case.

In addition to such another feature, the bottom wall of the inner container may have a concave portion from the outer surface curved inward at the center portion. In addition, the concave portion of the inner container can reinforce the bottom portion of the inner container so that the bottom of the inner container is brought closer to the bottom of the outer container, so that the gap between the inner container and the inner container can be made smaller than before. The concave part forms an inward convex part at the bottom of the inner container, and at the stage of manufacturing a metal vacuum double container, when the inner container is inverted and the bottom is supported by the upward jig that has entered it, the jig By fitting with the recess at the upper end, it becomes easier to position the inner container in the radial direction regardless of the play for the jig to enter the inner container.By this positioning, the outer container is aligned with the axis of the jig and supported by this jig. Positioning There is no positional deviation in the inner and outer container to fitting the both of the mouth each other went over the inner vessel,
It is possible to further prevent the deformation of the inner and outer containers by interfering with each other, and to further prevent the deformation, thereby further reducing the gap by making the body portions of the inner and outer containers closer to each other than before.

In addition to each of the inventions according to this one aspect,
Further, the bottom wall of the outer container has a concave portion from the outer surface curved inward at the center portion, and an exhaust hole for vacuum exhaust provided at the bottom portion of the concave portion is vacuum-sealed with a sealing material. It can be.

In this case, the inwardly curved concave portion at the center of the bottom wall of the outer container brings the bottom of the outer container closer to the bottom of the inner container than before by the reinforcement for increasing the deformation strength of the bottom wall. In this way, the gap between the both can be reduced, and the sealing material does not flow out to the outside when sealing with the sealing material that is cured after the exhaust hole at the bottom is once melted, and is also cured. Later seals help to protect against external forces during subsequent handling and use.

In addition to the above inventions, if the gap between the inner and outer containers is 3 mm or less,
The metal vacuum double container can be made slim compared to the conventional one while preventing the inner and outer containers from deforming and coming into contact with each other and impairing the heat insulating property of the vacuum space.

In addition to the above inventions, when the inner and outer vessels are made of stainless steel, the low thermal conductivity of stainless steel has an advantage that the heat retention can be more easily enhanced than when other metals are used. At the same time, since the corrosion resistance is improved, it can be used for a long time and cleanly.

In addition to the above inventions, if the hermetic joint is welding, it is possible to secure airtightness and to sufficiently secure the strength of integration of the inner and outer containers.

[0025] In addition to the above-mentioned invention having a concave portion for vacuum sealing on the bottom wall of the outer container, if the concave portion is further covered with a cover, the sealing material for vacuum-sealing the outer container becomes a metal vacuum. It is possible to prevent the double container from being damaged due to an external force in handling or using the container and the sealing from being damaged.

When the cover is integrally joined to the outer container, the cover for covering the concave portion falls off due to an external force in handling and using the metal vacuum double container, so that the protection of the sealing material is impaired. Can be prevented.

If the cover is detachably mounted around the bottom of the outer container, the sealing material can be protected without the inconvenience that the cup cannot be used, such as when carrying the product, which is susceptible to external force. When handling a vacuum double container made of metal, care must be taken to place and lift it on a flat part, so external force is not easily applied to the sealing material. It is difficult for the stopper to be damaged by external force.

In addition to the above inventions, if the height of the getter provided on the inner surface of the bottom of the outer container is equal to or less than the normal distance between the bottoms of the inner and outer containers, the metal vacuum double The gap between the inner and outer containers does not become particularly large.

By setting the getter provided on the inner surface at the bottom of the outer container to be lower than the projecting position of the outer container toward the inside of the concave portion, the gap between the inner and outer containers of the metal vacuum double container is obtained by the getter itself. Can be avoided.

The getter provided on the inner surface of the bottom portion of the outer container can be obtained by providing the step of the inner container when the getter is located outside the step in addition to the invention having the step in the inner container. The concave portion and the getter are prevented from overlapping each other to increase the gap between the bottom portions of the inner and outer containers, and do not hinder the slimming of the metal vacuum double container.

In addition to the inventions having a getter on the inner surface of the bottom of the outer container, if the getter is at the lower part of the bottom of the outer container, the gap between the bottom of the outer container and the bottom of the inner container is increased. By locating in the easy part, even if a getter is provided, the metal vacuum double container can be made slimmer,
The space for the getter can be set aside, and the freedom of setting the height of the getter is improved.

In addition to the above inventions, when both the inner container and the outer container are made of one member, the number of manufacturing steps is reduced, and the product cost is reduced. In addition, it is possible to solve the problem that foreign matter enters a detail portion due to a seam or the like of a member and is difficult to remove by washing or the like.

According to the method for manufacturing a metal vacuum double container of the present invention, an upwardly facing jig enters an inverted metal inner container and supports the inner bottom to support the inner container. A joint jig is fitted in a concave or convex portion that is continuous around a certain axis and positioned in the radial direction, and the inner container in this supported and positioned state is covered with the inverted outer container in alignment with the jig, After fitting the mouth portion of the outer container to the mouth portion of the inner container, the inner and outer containers are integrated by welding and joining the fitted mouth portions to each other, followed by vacuum evacuation and subsequent vacuum sealing. And

According to such a configuration, the upward jig enters the inverted metal inner container, supports the inner bottom and supports the inner container. In this state, the inverted outer container is attached to the inner container. After covering the jig with the axis aligned and fitting the mouth of the outer container to the mouth of the inner container, the inner and outer containers are integrated by welding and joining the fitted mouths, and vacuum evacuation, And then subjected to vacuum sealing to produce a metal vacuum double container, in order to support the inner container in an inverted state, the jig of the jig in a concave or convex portion continuous around the axis at the bottom of the inner container Since the protrusions or recesses are fitted and positioned in the radial direction, the recesses and protrusions form inward protrusions and recesses at the bottom of the inner container, and are fitted with the recesses and protrusions at the upper end of the jig. , Play for the jig to enter the inner container Since the inner container can be positioned in the radial direction regardless of the position, the outer container is aligned with the axis of the jig by this positioning, the inner container supported and positioned by this jig is covered, and both mouths are fitted together. In addition, it is possible to prevent the inner and outer containers from interfering with each other without being displaced without being displaced, and to reduce the gap by making the body portions of the inner and outer containers closer to each other than before in order to prevent this deformation. In addition, the concave portion and the convex portion of the bottom wall of the inner container can be made closer to the bottom of the outer container as compared with the related art so as to reduce the gap therebetween by the amount of reinforcement that increases the deformation strength of the bottom wall.

In addition to the present invention, it is preferable that the inner and outer vessels are made of stainless steel as described above.

Further objects and features of the present invention will become apparent from the following detailed description and drawings. Each feature of the present invention can be used alone or in combination in various combinations.

[0037]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings together with the embodiments to provide an understanding of the present invention.

This embodiment is an example in which the present invention is mainly applied to a portable heat-insulating bottle for beverages. However, the present invention is not limited to this, and the present invention is effective when applied to all vacuum double containers made of metal, such as stationary or mug-type heat retaining bottles, electric pots, and lunch jars.

The vacuum double container of the present embodiment is shown in FIGS.
As shown in FIG. 2, a metal inner container 1 and an outer container 2 are double-combined, and a container body 4 having a vacuum heat insulating space 3 therebetween is provided. The inner container 1 and the outer container 2 are both formed of stainless steel or the like, and are welded and joined at the mouth 4a. However, the metal material used for the inner and outer containers 1 and 2 is not limited to this, and can be variously set according to suitability and needs from the use and purpose of use. In FIG. 1, P indicates a welded joint of the mouth 4a, and the inner and outer containers 1 and 2 are integrally connected. However, the mouth 1 of the inner and outer containers 1 and 2
The integration between a and 2a is not limited to welding, and other air-tight joining methods such as brazing and adhesion can be adopted.

As shown in FIG. 2, a screw 6 is formed in the mouth 1a of the inner container 1 to be screwed with the stopper member 5 made of synthetic resin. Forming a shoulder 8 facing the lower end of the outer peripheral skirt wall 5a covering the portion 2a;
The plug member 5 and the body 2b of the outer container 2 are configured to be flush with each other as shown in FIGS. A screw 9 is formed on the inner periphery of the plug member 5 so that the cover plate 7 can be detachably attached. The plug member 5 may have a necessary structure if necessary, and may be made of metal in some cases. The plug member 5 can be screwed onto the outer periphery of the mouth 4a of the container body 4.

Each of the inner and outer containers 1 and 2 is integrally formed so as to have bottoms 1c and 2c from one plate member. As shown in FIGS. 1 and 3, the bottom 2 c of the outer container 2 has an exhaust hole 11 for evacuation, and the vacuum heat insulating space 3 is evacuated through the exhaust hole 11. After the material 12 is melt-filled into the exhaust holes 11 and solidified, the exhaust holes 11 are sealed.

In particular, in this embodiment, the container body 4 as described above is composed of the metal inner container 1 and the outer container 2.
And the inner surface of the inner and outer containers 1 and 2 are united by airtight joining at the fitting portions of the mouth portions 1a and 2a of the inner and outer containers 1, 2 and the outer surface curved inward at the center at the bottom 1c of the inner container 1. It has a concave portion 13 from above.

As described above, the concave portion 13 which is curved inward at the center of the wall of the bottom 1c of the inner container 1 is different from the prior art by the bottom 2c of the outer container 2 as much as reinforcement for increasing the deformation strength of the wall of the bottom 1c. And the gap between the bottoms 1c and 2c can be reduced.

At the same time, the concave portion 13 forms an inward convex portion 13a on the bottom 1c of the inner container 1, and at the stage of manufacturing the container body 4, the inner container 1 is turned upside down as shown in FIG. When the bottom portion 1c is supported by the jig 14 facing upward, the inner container 1 is fitted in the concave portion 14b of the upper end portion 14a of the jig 14 so that the inner container 1 can be displaced in the radial direction regardless of the play S for the jig 14 to enter the inner container 1. So that it can be positioned.

By positioning the inner container 1 in the radial direction,
The outer container 2 gripped in an inverted state by a device or a jig (not shown) is aligned with the axis Z of the jig 14, and is covered from above on the inner container 1 supported and positioned by the jig 14. As shown in FIG. 5, the inner and outer containers 1 and 2 are prevented from being deformed due to interference between the inner and outer containers 1 and 2 without displacement, and the inner and outer containers 1 and 2 are prevented by this deformation. Between the body portions 1b and 2b can be made closer to each other than in the related art to reduce the gap.

As described above, the metal container body 4 having the vacuum heat insulating space 3 can be made slimmer than the conventional one only by the inner container 1 having the concave portion 13 at the bottom 1c thereof. At the time of handling, it is possible to avoid such a problem that the inner and outer containers 1 and 2 come into contact with each other due to deformation due to an external force during use, thereby impairing the heat insulating property of the vacuum heat insulating space 3.

In the first embodiment shown in FIGS.
On the wall of the bottom portion 1c of the inner container 1, there is provided a concave portion 15 from the inner surface forming a step portion 1c2 facing downward to the outside inside the outer peripheral portion 1c1.

The stepped portion 1c2 is positioned continuously around the axis Y of the container main body 4 at a portion near the outer periphery of the inner container 1, and in addition to the bottom 1c of the inner container 1, the body 1b of the inner container 1 Also reinforce the lower part. As a result, the bottom 1c and the lower part of the body 1b of the inner container 1 are connected to the bottom 2c and the body 2 of the outer container 2.
The gap can be made smaller by bringing it closer to the lower part of b than in the conventional case. At the same time, at the stage of manufacturing the container body 4, as described above, when the inner container 1 is turned upside down as shown in FIG. 5 and the bottom 1 c is supported by the upward jig 14 inserted therein, As shown in FIG. 5, by fitting with the convex portion 14c at the upper end of the jig 14,
Irrespective of the play S for the jig 14 to enter the inner container 1, the inner container 1 can be positioned in the radial direction in a more stable support state by fitting near the outer peripheral portion 1c1 of the bottom 1c.

Therefore, with this stable support and positioning, the outer container 2 can be fitted only with the stepped portion 1c2 and the convex portion 14c of the jig 14 as compared with the case where only the fitted portion is fitted with the concave portion 13 of the inner container 1. Positioning can be performed accurately and stably. The inner container 1 and the outer container 2 are fitted to the inner container 1 supported and positioned by the jig 14 in accordance with the axis Z of the jig 14 so as to fit both mouth portions together. Are prevented from interfering with each other and deforming, and the deformation can be prevented, so that the gap between the body portions of the inner and outer containers can be made closer to each other than in the above case to reduce the gap.

When the stepped portion 1c2 is located inside the position of the minimum inner diameter D of the inner container 1, as shown in FIG. And the convex portion 14c is provided on the step portion 1c2.
Can be positioned by fitting.

The recess 13 and the step 1c2 allow
In order to position the inner container 1 in the radial direction between the jig 14 and the jig 14, only one of them is sufficient, and the trouble that satisfies the accurate fitting at two places can be eliminated. It is preferable that both the step and the step portion 1c2 be provided so that play is provided for fitting with one of the jigs 14 and guiding of fitting is performed on the other. It is more preferable to give priority to the fitting at the step portion 1c2 which is advantageous for stabilizing the positioning and support in the direction. The stepped portion 1c2 may be formed by an annular groove in addition to a mode covering the entire area surrounded by the stepped portion 1c2.

In the embodiment shown in FIGS. 1 to 5, a wall 31 at the bottom 2c of the outer container 2 has a concave portion 31 from the outer surface which is curved inward at the center portion. Exhaust hole 11 is provided, and the exhaust hole 11 is vacuum-sealed by the sealing material 12 in the concave portion 31. The recess 31 allows the bottom 2c of the outer container 2 to be closer to the bottom 1c of the inner container 1 as compared with the conventional case, so that the gap between the bottom 2c and the inner container 1 can be reduced by an amount corresponding to reinforcement that increases the deformation strength of the wall of the bottom 2c. The sealing material 12 does not flow out when sealing with the sealing material 12 which once melts the exhaust hole 11 of the bottom 2c and then hardens, and the hardened sealing material 12 is used for subsequent handling. And help protect from external forces in use.

As described above, when the inner and outer containers 1 and 2 are made of stainless steel, there is an advantage that the heat retention is more easily enhanced than when other metals are used due to the low thermal conductivity of stainless steel. At the same time, since the corrosion resistance is improved, it can be used for a long time and cleanly. Further, if the hermetic joining is welding, it is possible to secure the airtightness and to sufficiently secure the airtightness and the strength of integration of the inner and outer containers 1 and 2.

In the above embodiment, the outer diameter is 72 mm, the inner container b is 0.8 mm in thickness, and the outer container c is 0.4 mm in thickness. The gap is set to 2 mm or less, and the container main body 4 is significantly slim compared to the conventional one while preventing the inner and outer containers 1 and 2 from deforming and coming into contact with each other and impairing the heat insulation by the vacuum heat insulating space 3 in manufacturing and use. Could be transformed. The gap is 3 m
Even if it is less than m, the slimming of the container body 4 is sufficiently effective as compared with the conventional case.

When the concave portion 31 for vacuum sealing provided on the wall of the bottom portion 2c of the outer container 2 is covered with the cover 17 as shown in FIG. In addition, it is possible to prevent the container main body 4 from being damaged due to an external force in handling or using the container main body 4 and the sealing from being damaged.

When the cover 17 is made of the same material as the inner and outer containers 1 and 2 or is made of a metal material which can be welded and joined to the outer container 2 integrally with the spot, the cover 17 covering the concave portion 31 It is possible to prevent the sealing material 12 from falling off due to an external force during handling and use of the sealing material, thereby preventing the sealing material 12 from being damaged.

If the cover 17 is a cup (not shown) in which the cover 17 is screwed around the bottom 2c of the outer container 2 so that it can be attached and detached, the cup can be sealed without inconvenience that the cup cannot be used, such as when carrying easily subjected to external force. The stopper material can be protected, and when the cup is used, when the container body 4 is handled, the container must be carefully handled just by placing it on a flat part or lifting it up. It is difficult for the sealing material 12 to be damaged by an external force even if it is used after being removed.

In the embodiment shown in FIGS. 1 to 5, furthermore, after the sealing material 12 is accommodated in the concave portion 31, a falling-off prevention plate 21 for preventing the sealing material 12 from falling off is attached by a spot welding portion 22 or the like. Even when the sealing material 12 is housed in the recess 31 from the stage before the outer container 2 is combined with the inner container 1 and the work procedure is streamlined, the sealing material 12 is sequentially used for evacuation and vacuum sealing. In addition, it is possible to prevent the sealing material 12 from falling off and being unable to be vacuum-sealed.

The cover 17 is provided in the first recess 33 of the reinforcing flat recesses 33, 34 formed in two steps in the bottom 2c of the outer container 2 so as not to protrude from the outer surface of the bottom 2c. The falling-off prevention plate 21 is provided in the concave portion 34 of the second section so as not to interfere with the cover 17, and the concave portion 31 is formed in the concave portion 34 of the second step. However, the number of steps of the concave portions 33 and 34 for reinforcement can be arbitrarily set.

If the height of the getter 23 provided on the inner surface of the bottom 2c of the outer container 2 together with the mounting bracket 24 thereof is less than the normal distance between the bottoms 1c and 2c of the inner and outer containers 1 and 2, By providing 23, the gap between the inner and outer containers 1 and 2 of the container main body 4 does not become particularly large, and is provided without any space problem at any part between the bottoms 1c and 2c of the inner and outer containers 1 and 2. be able to.

The height of the getter 23 provided on the inner surface of the bottom portion 2c of the outer container 2 or the height of the getter 23 is, as in the embodiment shown in FIGS. And the bottom 1 of the inner and outer containers 1 and 2 of the container body 4 by providing the getter 23.
The inconvenience of having to increase the gap between c and 2c can be avoided.

As described above, when both the inner container 1 and the outer container 2 are made of one member, the manufacturing process is as follows.
After the outer container 2 is formed into a shape having bottoms 1c and 2c, Cu plating and washing are performed respectively. Next, the getter 23 and the sealing material 12 are provided on the bottom 2 c of the outer container 2.
After the falling-off prevention plate 21 is attached and the sealing material 12 is pressed down to prevent the falling-off, the inner and outer containers 1 and 2 are combined, and their mouths 1a and 2a are TIG-welded to be evacuated and vacuum-sealed. Like that. Thereby, the operation of separately forming the bottom 2c of the outer container 2 and the operation of joining the separately formed bottom 2c to the lower end of the outer container 2 can be omitted. Costs are reduced. In addition, it is possible to solve the problem that foreign matter enters a detail portion due to a seam of a member and is difficult to remove by washing or the like.

In the second to fourth embodiments shown in FIGS. 6 to 8, the recesses 13 and 31 from the outer surface curved inward at the center are formed in both the walls of the bottoms 1c and 2c of the inner and outer containers 1 and 2. The recess 31 in the bottom 2c of the outer container 2 has an exhaust hole 11 for evacuation in the bottom 2c and a gap S in which the evacuation can be performed in the recess 13 in the bottom 1c of the inner container 1 to form the vacuum heat insulating space 3.
1 is different from that of the first embodiment in that the exhaust hole 11 is sealed with a sealing material 12 except for the hole 1.

The bottoms 1c, 2 of the inner and outer containers 1, 2
The concave portions 13 and 31 curved inward at the center of the wall of c,
The bottoms 1c and 2c of the inner and outer containers 1 and 2 can be made closer to each other than before so as to reduce the gap between them by the reinforcement that increases the deformation strength of the walls of the bottoms 1c and 2c. At the same time, the sealing material 12 does not flow out to the outside when the recess 31 of the outer container 2 is sealed with the sealing material 12 which is once melted and then hardened after the exhaust hole 11 in the bottom 2c is hardened. Even if the later sealing material 12 is formed at a depth larger than the small gap S1 enough to protect from external force in the subsequent handling and use, the inward convex portion due to the concave portion 31 of the outer container 2 is formed. 31a enters the recess 13 of the inner container 1 to prevent the gap between the bottoms 1c and 2c of the inner and outer containers 1 and 2 from being reduced. The formation of the space 3 can be ensured.

In the second embodiment shown in FIG. 6, the getter 23 provided on the inner surface of the bottom 2c of the outer container 2 is located on the outer peripheral side of the bottom 2c. Thereby, the bottom 1 of the inner container 1
By utilizing the fact that the gap between the bottoms 1c and 2c is increased by the shape such that c is curved upward toward the outer periphery as in the illustrated embodiment, the getter 23 can be easily provided without requiring a special space. Thus, it is possible to contribute to slimming of the container body 4.

The other structure and the operation and effect provided are the same as those of the first embodiment, and the same members are denoted by the same reference numerals, and overlapping illustration and description will be omitted.

The third embodiment shown in FIG.
Are located outside the step 1c2 formed on the bottom 1 of the inner container 1. According to this, the concave portion 15 formed by providing the stepped portion 1c2 of the inner container 1 and the getter 23 overlap vertically, and the bottom portions 1c of the inner and outer containers 1, 2 are removed.
This prevents the gap between 2c from becoming large and does not prevent the container body 4 from being slim.

The other structure and the operation and effect provided are the same as those of the first embodiment, and the same members are denoted by the same reference numerals, and overlapping illustration and description are omitted.

In the fourth embodiment shown in FIG. 8, the getter 23 is provided at a lower portion of the bottom portion 2c by using reinforcing recesses 33 to 35 formed in three steps in the bottom portion 2c of the outer container 2. Accordingly, by locating the bottom 2c of the outer container 2 in a portion where the gap between the bottom 2c of the inner container 1 and the bottom 1c of the inner container 1 is easily increased, the container body 4 can be made slim even when the getter 23 is provided, and at the same time, The installation space can be afforded, and the freedom of setting the height of the getter 23 is improved. In this sense, the getter 23 is preferably provided at the lowest position of the bottom 2c.

The other structure and the function and effect to be achieved are the same as those of the first embodiment, and the same members are denoted by the same reference numerals and overlapping illustration and description are omitted.

The fifth embodiment shown in FIG. 9 is an example of a lunch jar in which the container body 4 contains a juice container 41 made of synthetic resin, a rice container 42, and two vegetable containers 43, 44. A mouth member 45 made of synthetic resin is forcibly fitted and attached to the mouth portion 4a of the container body 4, and the thread 45a of the mouth member 45 is attached.
A relatively high synthetic resin cup 46 is screwed on and attached so as to be detachable, so that an accommodation space nearly twice the capacity of the container body 4 is formed between the cup 46 and the container body 4. Thus, the juice container 41, the rice container 42, and the two vegetable containers 43 and 44 can be accommodated in a stacked manner higher than the container body 4.

The juice container 41, the rice container 42, and the two vegetable containers 43 and 44 are all provided with lids.
It is not particularly limited to this. On a part of the outer periphery of the mouth member 45, a holding portion 48 for inserting and holding the chopstick box 47 so as to be detachable is provided. However, this is not essential and may be provided in any manner. A small cup 49 having a capacity of approximately half is screwed to a screw 46a outside the upper half part of the cup 46 having a slightly smaller diameter so as to be detachable. This small cup 49 can be screwed so that it can be directly attached to and detached from the mouth member 45 instead of the cup 46, so that the container body 4 can be used as a small-capacity lunch jar.

The recess 13 provided at the center of the bottom 1c of the inner container 1 has a larger diameter and shallower than that of the first embodiment, so that it can be commonly used for positioning the accommodated juice container 41 and reinforcing its load. It is.

The other structure and the operation and effect provided are the same as those of the first embodiment, and the same members are denoted by the same reference numerals and overlapping illustration and description will be omitted.

[0075]

According to one aspect of the present invention, the inwardly curved concave portion at the center of the bottom wall of the inner container has the same strength as that of the bottom of the outer container, which is reinforced by increasing the deformation strength of the bottom wall. Can also be reduced to reduce the gap between the two, the concave portion forms an inward convex portion at the bottom of the inner container, and in the stage of manufacturing a metal vacuum double container, the inner container is turned upside down. When supporting the bottom with an upward jig that has entered into it, by fitting it into the recess at the upper end of the jig, the inner container can be positioned in the radial direction regardless of the play for the jig to enter the inner container, By this positioning, the outer container is aligned with the axis of the jig and covered with the inner container supported and positioned by this jig, and there is no displacement between the inner and outer containers to fit both mouths, and they interfere with each other I'll transform Prevents such, between the body of divided inner and outer containers this deformation can be prevented can be moved closer than ever to reduce the gap.

According to another aspect of the present invention, the inwardly curved concave portion at the center of the bottom wall of the inner and outer containers has a structure in which the bottom portions of the inner and outer containers are connected to each other by the amount of reinforcement for increasing the deformation strength of the bottom wall. The gap between the two can be made smaller and the gap between the two can be made smaller. Does not flow out, and even if the cured sealing material is formed at a depth larger than the small gap that is sufficient to protect from external force in subsequent handling and use, The evacuation and the formation of the vacuum space can be ensured by the gap between the two concave portions without the inwardly protruding portion entering the concave portion of the inner container and preventing the gap between the bottom portions of the inner and outer containers from being reduced. . In addition, the concave part of the inner container forms an inward convex part at the bottom of the inner container, and at the stage of manufacturing a metal vacuum double container, the inner container is inverted and the bottom is supported by an upward jig that has entered it. By fitting the jig into the recess at the upper end of the jig, the inner container can be positioned in the radial direction regardless of the play for the jig to enter the inner container. When the inner and outer containers are covered with the inner container supported and positioned by the leverage jig and the two mouths are fitted together, there is no displacement between the inner and outer containers, and they are prevented from interfering with each other and deforming. Therefore, the gap between the body portions of the inner and outer containers can be made closer to each other than before so that the gap can be reduced.

In addition to these inventions, if the bottom wall of the inner container further has a recess from the inner surface forming a step facing downward on the inner side of the outer peripheral portion with respect to the outer side, the stepped portion of the inner container It is located continuously around the axis of the container near the outer periphery, and in addition to the bottom of the inner container, it also reinforces the lower part of the body of the inner container, so the bottom of the inner container and the lower end of the body are attached to the bottom of the outer container. And the gap can be made smaller by bringing it closer to the lower end of the body than in the above case, and the stepped part is inserted into the inner container in an inverted state at the stage of manufacturing a metal vacuum double container. By supporting the bottom part with the upward jig and fitting it with the convex part at the upper end of the jig, the inner container can be fitted near the outer periphery of the bottom part regardless of the play for the jig to enter the inner container. Radial direction with stable support Since the positioning can be performed, this stable support and positioning aligns the outer container with the axis of the jig, covers the inner container supported and positioned by this jig, and fits both mouths into the inner and outer containers. Since there is no displacement, they can be prevented from interfering with each other and being deformed, and the deformation can be prevented.

When the step is inside the minimum inner diameter position of the inner container, the inner container is supported by a jig having a size and a shape that can easily enter and exit the inner container, and a convex portion is fitted to the step. Can be positioned.

According to another aspect of the present invention, the step portion is located continuously around the axis of the container near the outer periphery of the inner container, and in addition to the bottom portion of the inner container, the lower portion of the body of the inner container is formed. Also, the gap can be reduced by bringing the bottom of the inner container and the lower end of the body closer to the bottom of the outer container and the lower end of the body than in the above case, and the step can be made of metal vacuum. At the stage of manufacturing the double container, the inner container is turned upside down, and when the bottom is supported by the upward jig that has entered the inner container, the inner container is fitted with the protrusion at the upper end of the jig to allow the jig to enter the inner container. Regardless of the inner container, it can be positioned in the radial direction with a more stable support state by fitting near the outer periphery of the bottom, so that the outer container is aligned with the axis of the jig by this stable support and positioning. Lever with jig The inner and outer containers are not misaligned when they are fitted over the positioned inner container and the two mouths are fitted to each other to prevent them from interfering with each other and deforming. The gap between the body portions of the containers can be made smaller than in the above case to reduce the gap.

In particular, when the bottom wall of the inner container has a concave portion from the outer surface curved inward at the center, the concave portion of the inner container further reinforces the bottom of the inner container. The gap between both can be made smaller than before by bringing the bottom part closer to the bottom part of the outer container, and the concave part at the bottom part of this inner container forms a convex part inward at the bottom part of the inner container, and the metal vacuum double At the stage of manufacturing the container, the inner container is turned upside down, and when the bottom is supported by the upward jig inserted into it, it is fitted with the recess at the upper end of the jig, regardless of the play for the jig to enter the inner container Since the inner container is easily positioned in the radial direction, the outer container is aligned with the axis of the jig by this positioning, and the inner container supported and positioned by the jig is covered with the inner container. There is no misalignment, and it is possible to prevent them from interfering with each other and being deformed, and to further prevent the deformation, so that the gap between the body portions of the inner and outer containers can be made closer than before so that the gap can be further reduced. .

In addition to each of the inventions according to this one feature,
Further, the bottom wall of the outer container has a concave portion from the outer surface curved inward at the center portion, and an exhaust hole for vacuum exhaust provided at the bottom portion of the concave portion is vacuum-sealed with a sealing material. It can be.

In this case, the inwardly curved concave portion at the center of the bottom wall of the outer container makes the bottom of the outer container closer to the bottom of the inner container than before by the amount of reinforcement that increases the deformation strength of the bottom wall. In this way, the gap between the both can be reduced, and the sealing material does not flow out to the outside when sealing with the sealing material that is cured after the exhaust hole at the bottom is once melted, and is also cured. Later seals help to protect against external forces during subsequent handling and use.

In addition to the above-mentioned inventions, if the gap between the inner and outer containers is 3 mm or less, it is difficult to manufacture and use.
The metal vacuum double container can be made slim compared to the conventional one while preventing the inner and outer containers from deforming and coming into contact with each other and impairing the heat insulating property of the vacuum space.

In addition to the above inventions, when the inner and outer containers are made of stainless steel, the low thermal conductivity of stainless steel has an advantage that the heat retention can be more easily improved than when other metals are used. At the same time, since the corrosion resistance is improved, it can be used for a long time and cleanly.

In addition to the above inventions, when the hermetic joint is welding, it is possible to secure airtightness and to sufficiently secure the strength of integration of the inner and outer containers.

In addition to the invention in which the outer wall has a concave portion for vacuum sealing on the bottom wall, if the concave portion is further covered with a cover, the sealing material in which the outer container is vacuum-sealed becomes a metal vacuum. It is possible to prevent the double container from being damaged due to an external force in handling or using the container and the sealing from being damaged.

When the cover is integrally joined to the outer container, the cover for covering the concave portion falls off due to an external force in handling and using the metal vacuum double container, so that the protection of the sealing material is impaired. Can be prevented.

If the cover is detachably covered around the bottom of the outer container, the sealing material can be protected without the inconvenience that the cup cannot be used, such as during carrying, which is easily affected by external force. When handling a vacuum double container made of metal, care must be taken to place and lift it on a flat part, so external force is not easily applied to the sealing material. It is difficult for the stopper to be damaged by external force.

In addition to the above inventions, if the height of the getter provided on the inner surface of the bottom of the outer container is less than the normal interval between the bottoms of the inner and outer containers, the metal vacuum double The gap between the inner and outer containers does not become particularly large.

By setting the getter provided on the inner surface at the bottom of the outer container to be lower than the projecting position of the outer container toward the inside of the concave portion, the gap between the inner and outer containers of the metal vacuum double container is obtained by the getter itself. Can be avoided.

The getter provided on the inner surface of the bottom of the outer container can be obtained by providing the step of the inner container when the getter is outside the step in addition to the invention having the step in the inner container. The concave portion and the getter are prevented from overlapping each other to increase the gap between the bottom portions of the inner and outer containers, and do not hinder the slimming of the metal vacuum double container.

In addition to the inventions having a getter on the inner surface of the bottom of the outer container, if the getter is located at the lower portion of the bottom of the outer container, the gap between the bottom of the outer container and the bottom of the inner container is increased. By locating in the easy part, even if a getter is provided, the metal vacuum double container can be made slimmer,
The space for the getter can be set aside, and the freedom of setting the height of the getter is improved.

In addition to the above inventions, when both the inner container and the outer container are made of one member, the number of manufacturing steps is reduced, and the product cost is reduced. In addition, it is possible to solve the problem that foreign matter enters a detail portion due to a seam or the like of a member and is difficult to remove by washing or the like.

According to the method for manufacturing a metal vacuum double container of the present invention, the upward jig enters the inverted metal inner container to support the bottom portion and support the inner container. The outer container in an inverted state is covered with the jig so that the axis of the outer container is aligned with the jig, and the mouth of the outer container is fitted to the mouth of the inner container. The container is integrated, evacuated, and then subjected to vacuum sealing to produce a metal vacuum double container,
In order to support the inner container in an inverted state, the protrusion or the concave portion of the jig is positioned in the radial direction by fitting the convex portion or the concave portion of the jig into the concave portion or the convex portion continuous around the axis at the bottom of the inner container,
The recesses and protrusions form inward protrusions and recesses at the bottom of the inner container, and are fitted with the recesses and protrusions at the upper end of the jig, so that the inner container can enter the inner container regardless of play. Since the outer container can be positioned in the radial direction, the outer container is aligned with the axis of the jig by this positioning, and the inner container supported and positioned by this jig is covered. Without displacement
It is possible to prevent them from interfering with each other and being deformed, and to reduce the gap by making the body portions of the inner and outer containers closer to each other than before in order to prevent this deformation. In addition, the concave portion and the convex portion of the bottom wall of the inner container can be made closer to the bottom of the outer container as compared with the related art so as to reduce the gap therebetween by the amount of reinforcement that increases the deformation strength of the bottom wall.

In addition to the above invention, it is preferable to use stainless steel for the inner and outer containers as described above.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a container body which is a vacuum double container of a first example according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a mug-type heat retaining bottle configured using the container body of FIG.

FIG. 3 is a sectional view of a bottom portion of the container main body of FIGS. 1 and 2;

FIG. 4 is an external side view of the heat retaining bottle of FIG. 2;

FIG. 5 is an explanatory view showing one step in a manufacturing stage of the container body of FIG. 1;

FIG. 6 is a cross-sectional view of a container body showing a second embodiment.

FIG. 7 is a sectional view of a bottom portion of a container body showing a third embodiment.

FIG. 8 is a sectional view of a bottom portion of a container body showing a fourth embodiment.

FIG. 9 is a sectional view of a container body showing a fifth embodiment.

FIG. 10 is a side view showing a conventional heat-insulating bottle and showing a half of the bottle in cross section.

FIG. 11 is a sectional view of the bottom of the container body of FIG. 10;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Inner container 1a, 2a, 4a Mouth 1b, 2b Trunk 1c, 2c Bottom 1c1 Outer periphery 1c2 Step 2 Outer container 3 Vacuum insulation space 4 Container main body 11 Exhaust hole 12 Sealing material 13, 15, 31 Recess 14 Jig 14a Upper end portion 14b Concave portion 14c Convex portion D Minimum inner diameter S1 Gap X, Y axis

Claims (20)

[Claims] 1. An inner container made of metal and an outer container are double-assembled, and they are united by hermetic joining at a fitting portion between the mouths of the inner and outer containers to form a vacuum space between the inner and outer containers. A metal vacuum double container, characterized in that the bottom wall of the inner container has a concave portion from the outer surface curved inward at the center portion. 2. An inner container made of metal and an outer container are combined in a double manner, and they are united by air-tight joining at a fitting portion between the mouths of the inner and outer containers to form a vacuum space between the inner and outer containers. In the metal vacuum double container, the bottom wall of both the inner and outer containers has a recess from the outer surface curved inward at the center, and the recess at the bottom of the outer container has an exhaust hole for vacuum exhaust at the bottom. A vacuum double container made of metal, characterized in that it has a space in which a vacuum space can be formed by evacuating and forming a vacuum space at the bottom of the inner container, and the exhaust hole is sealed with a sealing material. 3. The metal vacuum container according to claim 1, wherein the bottom wall of the inner container has a concave portion from the inner surface forming a step portion facing downward on the inner side of the outer peripheral portion. Heavy container. 4. The metal vacuum double container according to claim 3, wherein the step is inside the minimum inner diameter position of the inner container. 5. An inner container and an outer container made of metal are combined in a double manner, and they are united by hermetic joining at a fitting portion between the mouths of the inner and outer containers to form a vacuum space between the inner and outer containers. A metal vacuum double container comprising: a bottom wall of an inner container having a recess from an inner surface forming a downward step inside the outer peripheral portion with respect to the outside. 6. The metal vacuum double container according to claim 5, wherein the bottom wall of the inner and outer containers has a concave portion from an outer surface curved inward at a central portion. 7. A bottom wall of the outer container has a concave portion from an outer surface curved inward at a central portion, and a vacuum exhaust hole provided at the bottom of the concave portion is vacuum sealed by a sealing material. The metal vacuum double container according to any one of claims 5 and 6, wherein: 8. The metal vacuum double container according to claim 1, wherein a gap between the inner and outer containers is 3 mm or less. 9. The metal vacuum double container according to claim 1, wherein the inner and outer containers are made of stainless steel. 10. The metal vacuum double container according to claim 1, wherein the hermetic joining is welding. 11. The metal vacuum double container according to claim 1, wherein the concave portion of the bottom wall of the outer container is covered with a cover. 12. The metal vacuum double container according to claim 11, wherein the cover is integrally joined to the outer container. 13. The metal vacuum double container according to claim 11, wherein the cover is a cup which is detachably mounted around the bottom of the outer container. 14. The metal vacuum duplexer according to claim 1, wherein the height of the getter provided on the inner surface of the bottom of the outer container is less than or equal to the normal distance between the bottoms of the inner and outer containers. container. 15. The metal vacuum double container according to claim 1, wherein the getter provided on the inner surface of the bottom portion of the outer container is lower than a position where the getter projects inside the concave portion of the outer container. 16. The getter provided on the inner surface of the bottom of the outer container is located outside the step of the inner container.
The vacuum double container made of metal according to any one of the above. 17. The getter provided on the inner surface of the bottom of the outer container is located at a lower portion of the bottom of the outer container.
4. The vacuum double container made of metal according to any one of items 3. 18. The metal vacuum double container according to claim 1, wherein both the inner container and the outer container are formed of one member. 19. An upwardly directed jig is inserted into an inverted metal inner container to support the inner container and support the inner container, and is joined to a concave portion or a convex portion continuous around an axis at the bottom of the inner container. Fit the convex or concave part of the jig and position it in the radial direction, cover the inner container in this supported and positioned state with the inverted outer container aligned with the axis of the jig, and cover the mouth of the outer container. After fitting into the mouth of the container, the inner and outer containers are integrated by welding and joining the fitted mouths, and the metal vacuum double is characterized by being subjected to vacuum evacuation and subsequent vacuum sealing. Container manufacturing method. 20. The method according to claim 19, wherein the inner and outer containers are made of stainless steel.