JP2637346B2 - Metal vacuum double container and manufacturing method thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum double container made of metal, such as a thermos, and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, Japanese Patent Laid-Open Publication No.
No. 103633 and JP-A-59-37914 disclose a method of manufacturing a metal inner container in which mouth portions are connected to each other and a metal vacuum double container in which a space between outer containers is evacuated. A tip tube projects outward from the bottom of the container, and a vacuum exhaust device is connected to the outside of the tip tube to evacuate the space, and then the outside of the tip tube is pressed against and sealed. Is what you do.

[0003]

In the prior art, since the tip tube provided at the bottom of the outer container protrudes outward, the overall height of the metal vacuum double container becomes large. There is a problem. Further, there is a problem that a bottom cover formed deeply must be provided to protect the protruding tip tube.

Further, in the above-mentioned prior art, the outside of the chip tube is sealed by pressing and cutting using a pinch-off machine or the like. Not only is it necessary, but also the sealing often becomes insufficient, the degree of vacuum deteriorates over time,
As a result, there is a possibility that the heat insulation performance is reduced.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a metal vacuum double container in which the overall height can be reduced in a metal vacuum double container in which the space between the inner container and the outer container is evacuated. And

Further, the present invention relates to a method for manufacturing a metal vacuum double container in which the space between the inner container and the outer container in which the mouth portions are connected to each other and the space between the outer containers is evacuated can reduce the overall height and seal the tip tube. It is an object of the present invention to provide a method for manufacturing a metal vacuum double container which can be easily removed from the vacuum.

[0007]

According to the first aspect of the present invention,
A vacuum is applied to the space between the inner container and the outer container where the mouths are connected, and a metal vacuum double container with a vacuum exhaust chip tube provided on the bottom member of the outer container. And a metal vacuum double container in which a tip tube provided with a solidified sealing material is inserted into the bottom member.

According to a second aspect of the present invention, there is provided a method of manufacturing a metal vacuum double container in which a space between an inner container and an outer container is connected to each other and the outer container is evacuated. The tip main pipe communicating the inside and the outside and containing the sealing material at the distal end side is connected by inserting the distal end side into an exhaust hole, then evacuating the tip main pipe and melting the sealing material. A method of manufacturing a metal vacuum double container, in which the tip side of the tip main pipe is sealed and the outer protrusion of the tip main pipe is removed thereafter.

According to a third aspect of the present invention, a cooling device is provided in the chip main pipe, and after the sealing material is evacuated and then melted, the tip side of the chip main pipe is sealed by the cooling device. A method for producing a metal vacuum double container according to claim 2, characterized in that:

[0010]

According to the first aspect of the present invention, the length of the tip tube can be eliminated or extremely shortened, so that the overall height of the metal double container can be reduced.

According to the structure of the second aspect, it is possible to easily seal the chip tube without requiring any special device or skill, and it is possible to prevent the degree of vacuum in the space from deteriorating.

According to the configuration of the third aspect, after the space portion is sufficiently evacuated, the raw material of the sealing member is melted and the sealing can be reliably performed.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. As shown in FIGS. 1 and 2, a metal double container main body 1 is provided with an inner container 2 made of a metal having a bottom, for example, stainless steel, and a space 3 outside the inner container 2. Outer container 4 made of metal such as stainless steel
The inner container 2 and the mouth portions 5 and 6 of the outer container 4 are connected to each other. The outer container 4 includes a cylindrical outer container body 7 having a mouth 6 and an opening at a lower part, and a bottom member 8 fixed to the bottom of the outer container body 7. As shown by the solid line in FIG. 2, a short tubular tip tube 9 for evacuating the space 3 is provided on the bottom member 8 by silver brazing or the like. The tip tube 9 is connected to the bottom member 8.
The front end 10 side is airtightly inserted and faces the space 3, and the front end 10 is formed with a slit-shaped opening 11 having a width W of 0.1 to 2.0 mm. Outside the tip tube 9
Reference numeral 12 is provided on substantially the same surface as the outer surface of the bottom member 8. Further, a sealing material 13 that is melted and solidified is provided so as to cover the opening 11.

Next, the manufacturing method will be described. As shown in FIG. 3, the inner portions 2 and the outer container main body 7 are integrated through the space portion 3 by hermetically connecting the mouth portions 5 and 6. A distal end 10 of a relatively long tip main pipe 9A as shown by a dashed line in FIG. 2 is inserted into an exhaust hole 14 previously drilled substantially at the center so as to communicate between the inside and the outside. A bottom member 8 having a protruding portion 12A protruding outward is fixed to a lower opening of the outer container body 7. The tip main pipe 9A is made of copper or iron, an iron-based alloy, stainless steel, an aluminum alloy, a copper-based alloy, glass, or the like, and its tip 10 is crushed flat as in the prior art. An opening 11 is formed, and the tip 10 is provided so that the protrusion of the tip 10 into the space 3 does not contact the inner container 2.

Next, the bottom member 8 is turned upside down,
Thereafter, the sealing member raw material 13A is inserted into the chip main pipe 9A from the outer protrusion 12A. The sealing member raw material 13A is 200 to
It is made of a material having a relatively low melting point of 600 ° C., for example, aluminum alloy, tin (melting point: 232 ° C.), silver tin alloy, lead, lead tin alloy, and low-temperature molten glass. In addition, inner container 2, outer container 4
If the material is stainless steel, the sealing material 13A is 400 ° C
It is desirable that the material be melted to a degree. The material 13A of the sealing member is shaped and sized so that it does not spill out of the slit-shaped opening 11 into the space 3 and passes through the chip tube 9A without clogging and accumulates on the tip 10 side. And one or more are inserted into a spherical, granular or irregular shape. Further, when the raw material 13A for the sealing member is melted, it does not drip from the opening 11 into the space 3.

Next, a vacuum exhaust device (not shown) is connected to the chip main pipe 9A while the metal double container 1 is inverted, and the space 3 is evacuated through the chip main pipe 9A. At the same time, the metal double container 1 is heated using a heater or a heating furnace (not shown) in a temperature range of, for example, 200 to 600 ° C. to a temperature at which the sealing member raw material 13A does not melt. Then, the space portion 3 is, for example, 1 × ¹⁰⁻² To
After evacuating to a pressure of rr or less, the material is heated to a temperature at which the sealing member raw material 13A melts in a temperature range of 200 to 600 ° C. As a result of this heating, as shown in FIG. 4, the sealing member raw material 13A melts and closes the opening 11 of the tip 10.

Thereafter, by cooling the closed metal double container 1, the molten sealing member raw material 13A is solidified to form the sealing material 13. And after it reaches room temperature,
As shown in (5), the outer protruding portion 12A of the tip main pipe 9A is cut. This cutting is performed so that the outer side 12 of the tip tube 9 is provided on substantially the same surface as the outer side surface of the bottom member 8, just before the joint between the bottom member 8 and the chip main pipe 9 </ b> A. (Not shown).

As described above, in the above embodiment, the space 3 between the inner container 3 and the outer container 4 where the mouth portions 5 and 6 are connected to each other.
Was vacuumized, and a molten and solidified sealing material 13 was provided on the tip 10 side in a metal vacuum double container in which a tip tube 9 for vacuum evacuation was provided on the bottom member 8 of the outer container 4. The tip tube 9 is inserted into the bottom member 8 and the outer side 12 of the tip tube 9 is provided on substantially the same plane as the bottom member 8, so that the projecting length of the tip tube 9 is eliminated or extremely reduced. It is possible to reduce the overall height of the metal double container 1, thereby providing a compact metal double container 1 even with the same capacity, and at the same time, to provide Even if a separate bottom cover (not shown) is provided in the, the bottom cover can be made shallower.

Further, a chip main pipe 9A containing a sealing material 13A is connected to the tip 10 side of the inside and outside of the outer container 4 and evacuated by the chip main pipe 9A. 13A is melted and the tip of the tip main tube 9A is melted.
By sealing the 10 side, it is possible to easily seal the chip tube 9 without requiring any special device or skill, so that the cost can be reduced and the degree of vacuum of the space 3 can be reduced. Deterioration can be eliminated. Furthermore, by removing the outer protruding portion 12A side of the chip main pipe 9 after the sealing, the extra protruding portion of the chip main pipe 9A is eliminated, so that the overall height of the metal double container 1 can be reduced. .

FIG. 6 shows a second embodiment of the present invention.
The same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted. In the second embodiment, as in the first embodiment, with the metal double container 1 inverted, the sealing member raw material 13A is inserted into the chip main tube 9A from the outer protruding portion 12A, and at the same time, the copper chip main tube is made. A water-cooled cooling device 21 composed of a pipe or a jacket is detachably fitted to the projecting portion of 9A. 22 and 23 are cooling water inlets of the cooling device 21;
Exit. Then, a vacuum exhaust device (not shown) is connected to the chip main pipe 9A to exhaust the gas. At the same time double metal container 1
Using a heater or a heating furnace (not shown), for example, 2
The material is heated to a temperature at which the sealing member raw material 13A melts in a temperature range of 00 to 600 ° C. Space portion 3 by the vacuum exhaust device when this, by flowing cooling water to the cooling device 21 to be evacuated for example up to a pressure of less than 1 × 10 ^{over 2} Torr, chips present as the sealing member material 13A does not ToruToru The tip 10 of the tube 9A is kept cool. After the space 3 is evacuated to a predetermined pressure, the supply of the cooling water of the cooling device 21 is stopped, so that the sealing member raw material 13A is heated by heat conduction from the metal double container 1, the heater or the heating furnace. The temperature is raised to melt and the sealing is performed. After that, the sealed metal double container 1 is cooled and cooled to room temperature, and then the tip main tube 9A is cooled.
Is cut on the side of the outer protruding portion 12A in the same manner as in the first embodiment.

As described above, by providing the cooling device 21 at the protruding portion of the chip main pipe 9A, during the exhaust of the space 3, the cooling device 21 keeps the sealing member material 13A at a low temperature so as not to melt. The sealing member material 13A is melted after the space portion 3 reaches a predetermined pressure, so that the sealing member material 13A melts after the space portion 3 is sufficiently evacuated. Sealing can be performed reliably.

The present invention is not limited to the above-described embodiment. For example, in the above-described embodiment, the tip of the tip main pipe is formed in a slit shape. Various modifications are possible, such as the formation of one or more.

[0023]

According to the first aspect of the present invention, the space between the inner container and the outer container in which the mouth portions are connected to each other is evacuated, and a tip tube for evacuating is provided on the bottom member of the outer container. In a metal vacuum double container, a tip tube provided with a melted and solidified sealing material on the tip side is inserted into the bottom member, and the outside of the tip tube is provided on substantially the same plane as the bottom member. It eliminates the protruding length of the tip tube,
Alternatively, it is possible to provide a metal vacuum double container that can be made extremely short, thereby reducing the overall height of the metal double container.

According to a second aspect of the present invention, there is provided a method of manufacturing a metal vacuum double container in which the space between the inner container and the outer container is connected to each other and the inner container is connected to the outer container. A tip main pipe containing a sealing material is connected to the tip side, and after evacuating the tip main pipe, the sealing material is melted to seal the tip side of the tip main pipe. By removing the outer protruding portion side of the chip main tube, it is possible to provide a method of manufacturing a metal vacuum double container that can reduce the overall height, can easily seal the chip tube, and can eliminate deterioration in the degree of vacuum.

According to a third aspect of the present invention, there is provided the chip main pipe, wherein a cooling device is provided in the chip main pipe, and the tip end side of the chip main pipe is sealed by evacuating and evacuation of the sealing material. This is a method for manufacturing a metal vacuum double container, in which the total height can be reduced, the tip tube can be easily sealed, and deterioration of the degree of vacuum can be reliably prevented.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view showing a first embodiment of the present invention.

FIG. 2 is a perspective view of a tip tube showing a first embodiment of the present invention.

FIG. 3 is a partially cutaway front view of an exhaust process showing the first embodiment of the present invention.

FIG. 4 is a partially cutaway front view showing a molten state of the sealing member according to the first embodiment of the present invention.

FIG. 5 is a partially cutaway front view of the main chip removal showing the first embodiment of the present invention.

FIG. 6 is a partially cutaway front view showing a second embodiment of the present invention.

[Explanation of symbols]

 2 inner container 3 space portion 4 outer container 5 6 mouth 8 bottom member 9 tip tube 9A tip main tube 10 tip 11 opening 12 outside 12A outside protrusion 13 sealing material 13A sealing member raw material 14 exhaust hole 21 cooling device

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Eiji Otsuka, Inventor 1-16-17 Nishi-Shimbashi, Minato-ku, Tokyo Inside Japan Oxygen Co., Ltd. (72) Inventor Jun Yamaki 1-1-16-7, Nishi-Shimbashi, Minato-ku, Tokyo (56) References JP-A-63-158027 (JP, A) JP-A-2-286111 (JP, A) JP-A-59-37914 (JP, A) JP-A-63-130737 (JP, A) JP, A)

Claims (3)

(57) [Claims] 1. A metal vacuum double container in which a space between an inner container and an outer container connected to each other in a mouth is evacuated and a tip tube for evacuating is provided on a bottom member of the outer container. A metal vacuum double container wherein a tip tube provided with a melted and solidified sealing material at an insertion tip side is inserted into the bottom member. 2. A method for manufacturing a metal vacuum double container in which a space between an inner container and an outer container with their mouths connected to each other is evacuated. The tip main pipe containing the sealing material on the side is connected by inserting the distal end side into an exhaust hole, and then evacuating the chip main pipe, melting the sealing material and melting the sealing raw material. A method for manufacturing a metal vacuum double container, comprising sealing a distal end side, and thereafter removing an outer protruding portion of the tip main pipe. 3. A cooling device is provided in the chip main pipe, and after the sealing material is melted after evacuation, the tip side of the chip main pipe is cooled and sealed by the cooling device. The method for producing a metal vacuum double container according to claim 2.