JPH078395A - Metal made vacuum double layer container and the manufacture thereof - Google Patents

Abstract

PURPOSE:To provide easy vacuum sealing at a lower cost in the manufacturing metal made vacuum double layer container, and it is able to reduce the cost manufacturing. CONSTITUTION:The metal made vacuum double layer container has the inner container 1 and the outer container 2, and the gap 5 between those containers used as vacuum insulator, wherein the exhaust hole 8 prepared on the double container A is vacuum sealed by the sealing material 9 from inside the gap between the outer and inner container. By this method, because the container can be heat exhausted in the heated furnace while the mouthpiece of the double container is set upward, the speed of the temp. rise of the inner container and the speed of exhausting can be accelerated considerably. Furthermore, the double container can be set in the vacuum heating furnace in usual upright position, the setting and taking out of the double container can be extremely easy.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal vacuum double container such as a portable thermos, a pot, a jar, etc., in which an exhaust port formed in either an inner container or an outer container is a metal brazing material or a low-temperature melting glass. The present invention relates to one sealed with a sealing material consisting of.

[0002]

2. Description of the Related Art As a method for manufacturing a metal vacuum double container, for example, an outer container is provided with an exhaust port, a metal brazing material is externally provided around the exhaust port, and a sealing member is provided on the exhaust port. A method in which the sealing member is placed so that there is a gap between it and the heating member is heated and evacuated in a vacuum heating furnace, the temperature is raised to the melting temperature of the metal brazing material, the sealing member is brazed, and vacuum sealing is performed ( (JP-A-58-192516), or a small hole or cutout is formed in an outer container, and a metal brazing material is arranged from the outside in the vicinity thereof, and then heated and exhausted in a vacuum heating furnace, and then the brazing material. Method of raising the brazing filler metal to the melting temperature and pouring the brazing filler metal into the small holes or cutouts, and vacuum sealing (Japanese Patent Application No. 1-1.
No. 06925), or small holes or cutouts are made in the inner container and the outer container, and low-temperature molten glass is placed from the outside in the vicinity of this, then heated and evacuated in a vacuum heating furnace, and then melting of the low-temperature molten glass. There is a method in which the temperature is raised to a temperature, the low-temperature molten glass is poured into the small holes or cutouts, and vacuum sealing is performed (Japanese Patent Application No. 4-327048).

[0003]

However, these conventional vacuum sealing methods have the following problems. In the sealing method using a metal brazing material or low-temperature molten glass, when heating and exhausting, the mouth is installed in a vacuum heating furnace with the mouth facing downward, so the mouth is blocked and the inner container is shaded, and heating by radiation is performed. In comparison, the temperature rise rate of the inner container, which is shaded compared to the outer container, is slow and it takes time to exhaust. Further, when the double container is installed with its mouth facing downward, if the container is unstable, a supporting member for supporting the double container is required, resulting in poor workability and poor productivity. Furthermore, in order to fix the sealing material to the outer surface, in most cases, the sealing material is fixed with an adhesive or binder, so it is necessary to completely evaporate the adhesive or binder in a vacuum. There is a problem that it takes longer time. In addition, there is a problem that workability is poor and productivity is not increased.

The present invention has been made in view of the above circumstances, and it is possible to perform a vacuum sealing process in the production of a metal vacuum double container easily and at low cost, and to reduce the production cost. The purpose is to provide heavy containers.

[0005]

A metal vacuum double container according to the present invention comprises a metal inner container and an outer container, and a metal vacuum chamber having a space between these inner and outer containers as a vacuum heat insulating layer. In the heavy container, the exhaust port formed in the double container is vacuum-sealed with a sealing material from the void side of the inner and outer containers. Further, the method for manufacturing a metal vacuum double container according to the present invention, in the vicinity of the exhaust port formed in any of the inner container and the outer container, the sealing material is arranged on the side of the void between the inner and outer containers, The inner container and the outer container are joined together to form a double container, and then the double container is placed in a vacuum heating furnace, and the gap between the inner and outer containers is evacuated and then the sealing material is softened and fluidized to form the inner and outer containers. It is characterized in that the exhaust port is sealed from the space side between them.

[0006]

In the metal vacuum double container of the present invention, since the exhaust port formed in the double container is vacuum-sealed from the void side of the inner and outer containers with a sealing material, the mouth of the double container faces upward. It can be heated and evacuated in the vacuum heating furnace, the opening of the double container is not blocked, and the radiant light of heating hits the inner container, so the opening of the double container is directed downward. The rate of temperature rise of the inner container is faster than that in the case of evacuation, and the evacuation time can be greatly shortened. Furthermore, the double container can be installed in a vacuum heating furnace in a normally standing state, a support member for supporting the double container is not required, and the double container can be installed and taken out very easily.

[0007]

1 and 2 are for explaining a first example of a method for manufacturing a metal vacuum double container according to the present invention. The metallic vacuum double container manufactured here is formed by integrally joining an inner container 1 made of stainless steel and an outer container 4 made of stainless steel at their mouths. It is a portable thermos with the void 5 of the container 4 as a vacuum heat insulating layer.

The outer container 4 is formed by airtightly joining the outer container bottom member 3 to the lower end of a substantially cylindrical outer container body 2. A convex portion 7 bulging downward in a hemispherical shape is provided at a substantially central portion of the outer container bottom member 3, and a small hole-shaped exhaust port 8 is formed at the center of the convex portion 7. The diameter of this exhaust port 8 is
It is desirable to set it to about 0.1 to 2.0 mm.

In order to manufacture this thermos, the inner container 1 and the outer container main body 2 are airtightly joined at their mouths, and the exhaust port 8 is closed inside the convex portion 7 of the outer container bottom member 3. So that the metal brazing material 9 is fixed with an adhesive or a binder, the getter 13 held by the holder is attached to a position other than the convex portion 7, and the outer container bottom member 3 is airtightly joined to the outer container body 2. The double container A before sealing shown in FIG. 1 is formed. Next, this double container A is transferred to and installed in a vacuum heating furnace with its mouth facing upward, and the inside of the furnace is evacuated and heated to be heated and evacuated. This heated exhaust is
The temperature is such that the metal brazing material 9 does not liquefy. The gas in the gap between the inner container 1 and the outer container 4 is exhausted through the exhaust port 8. After exhausting to a predetermined pressure, the temperature inside the furnace is raised to a temperature equal to or higher than the melting point of the metal brazing material 9 to liquefy the metal brazing material 9 and the exhaust port 8
And, it is dropped directly around it and the exhaust port is sealed. After this vacuum sealing, the container is taken out of the furnace, and as shown in FIG. 2, the exhaust port 8 is sealed from inside by the metal brazing material 9, and vacuum insulation between the inner container 1 and the outer container 4 is performed. Layer 6
A stainless steel thermos bottle (metal vacuum double container) in which is formed is obtained.

In this example, the convex portion and the exhaust port 8 have a double container A.
Since the double container A is vacuum-sealed by being formed at the bottom of the double container A, the double container can be installed in a vacuum heating furnace in a normally standing state, and supports the double container. Since no member is required, it is extremely easy to install and take out the double container. In addition, since the mouth of the double container is not blocked and the radiant light hits the inner container during heating by radiation, the temperature rise rate of the inner container is faster and the exhaust time is significantly longer than that of heating and exhausting with the mouth facing downward. Can be shortened.

FIG. 3 is for explaining a second example of the method for manufacturing a metal vacuum double container according to the present invention. The double container B shown in this figure includes substantially the same components as those shown in FIG. 1, and the same components are designated by the same reference numerals. In the double container B in this example, a hemispherical convex portion 7 is provided at a substantially central portion of the outer container bottom member 3, and
A small hole-shaped exhaust port 8 is formed in the center of the convex portion 7 and
A block-shaped metal brazing material 9 is attached to the inside of the container and fixed by a stopper 12 made of a plate-shaped or foil-shaped material.

Then, as in the previous example, the double container B is transferred to and placed in a vacuum heating furnace with its mouth facing upward, and the inside of the furnace is evacuated and heated to be heated and exhausted. The temperature of the heated exhaust gas is set so that the metal brazing material 9 does not liquefy. The gas in the gap between the inner container 1 and the outer container 4 is exhausted through the exhaust port 8. After exhausting to a predetermined pressure, the inside of the furnace is heated to a temperature equal to or higher than the melting point of the metal brazing material 9 to liquefy the metal brazing material 9 and to drop directly to the exhaust port 8 and its surroundings by its own weight to exhaust port 8 Is sealed from the inside. After this vacuum sealing,
A stainless steel thermos (metal vacuum double container) is obtained by removing the container from the furnace. The shape of the metal brazing material 9 used here is not limited to a lump, and may be a bar or the like and larger than the exhaust port 8.

In this example, since the metal brazing material 9 can be fixed by the stoppers 12, it is not necessary to use an adhesive or a binder, and it is not necessary to completely evaporate the adhesive or the binder when heating and exhausting, so that further exhausting is performed. The time can be shortened. In addition, for example, when a product that has not reached a sufficient degree of vacuum due to insufficient sealing of the exhaust port 8 is evacuated again, the metal brazing material is sealed from the gap side between the inner and outer containers. Since the metal brazing material is covered with the stopper 12 and is covered with the stopper 12, even if the metal brazing material is chipped or peeled off when the exhaust port 8 is formed again in the convex portion 7 for exhaust, these are fixed without scattering. Since it is in the state where it is kept, it can be recycled without disposing a new metal brazing material, and the manufacturing cost can be reduced.

FIGS. 4 and 5 are for explaining a third example of the method for manufacturing a metal vacuum double container according to the present invention. The double container C shown in this figure includes substantially the same components as those shown in FIG. 1, and the same components are designated by the same reference numerals. In the double container C shown in FIG. 4, a long groove 10 is formed in the central portion on the inner surface side of the outer container bottom member 3, and a slit-like long hole 11 (exhaust port) is formed in the bottom of the long groove 10.
As shown in FIG. 5, a rod-shaped low-temperature molten glass 14 having a length shorter than the length of the slit-shaped long hole 11 is arranged and pushed into the long groove 10, and the getter 13 is placed at a position other than the long groove 10. It is installed. Then, as in the previous example, the double container C is placed in a vacuum heating furnace in an upright state, and is first exhausted while being heated to a temperature at which the low-temperature molten glass 14 is not softened, and then exhausted to a predetermined pressure, The temperature inside the furnace is raised to a temperature above the softening point of the low temperature molten glass 14,
The slit-shaped long hole 1 by softening and flowing the low-temperature molten glass 14
1 is sealed from the inside to obtain a stainless steel thermos (metal vacuum double container). Low temperature molten glass 14 used here
The shape of is not limited to a rod shape and may be a solid shape.

In this example, the low-temperature molten glass 14 is placed in the long groove 1
By pushing into 0, a stopper for fixing is unnecessary, and the manufacturing process can be simplified. Further, it is not necessary to use an adhesive or a binder, and the exhaust time can be shortened.

FIG. 6 is for explaining a fourth example of the method for manufacturing a metal vacuum double container according to the present invention. The double container D shown in this figure includes substantially the same components as those shown in FIG. 1, and the same components are designated by the same reference numerals. The double container D shown in FIG. 6 is an outer container bottom member 3
Is provided with a hemispherical convex portion 7 at a substantially central portion thereof, and a small hole-shaped exhaust hole 8 is formed at the center of the convex portion 7, and a rod-shaped low-temperature molten glass 14 is provided inside the convex portion 7. Is attached and fixed by the getter 13.
Then, as in the previous example, the double container D is transferred to and installed in a vacuum heating furnace with its mouth facing upward, and the inside of the furnace is evacuated and heated to be heated and exhausted. The temperature of the heated exhaust gas is set to a temperature at which the low temperature molten glass 14 does not soften. The gas in the gap between the inner container 1 and the outer container 4 is exhausted through the exhaust port 8.
After exhausting to a predetermined pressure, low temperature molten glass 14
The temperature is raised to a temperature equal to or higher than the softening point of (1) to soften the low temperature molten glass 14 and directly drop it to the exhaust port 8 and its surroundings by its own weight to seal the exhaust port 8 from the inside. After this vacuum sealing, the container is taken out of the furnace to obtain a stainless steel thermos (metal vacuum double container). The shape of the low temperature molten glass 14 used here is not limited to the rod shape, and may be a lump shape larger than the exhaust port 8.

In this example, when the low temperature molten glass 14 is fixed, it is fixed by the getter 13, so that no stopper is required and the manufacturing process can be simplified. Further, it is not necessary to use an adhesive or a binder, and the exhaust time can be shortened. Further, when the product that has not reached a sufficient degree of vacuum is evacuated again, it can be regenerated without disposing a new low temperature molten glass, and the manufacturing cost can be reduced. The getter 13 used in this example is not limited to the getter held by the holder, and a getter or the like applied to a ribbon-shaped base metal may be used.

[0018]

As described above, since the metallic vacuum double container of the present invention has the exhaust port formed in the double container vacuum-sealed with the sealing material from the void side of the inner and outer containers, The dual container can be heated and exhausted in a vacuum heating furnace with the mouth of the double container facing upward, the mouth of the double container is not blocked, and the radiant light of heating hits the inner container, so the double container The temperature rise rate of the inner container is higher than that in the case of heating and evacuating with the mouth portion facing downward, and the evacuation time can be greatly shortened. Furthermore, the double container can be installed in a vacuum heating furnace in a normally standing state, a support member for supporting the double container is not required, and the double container can be installed and taken out very easily.

Further, when the sealing material is fixed by pushing it into the stopper or the long groove, it is not necessary to use an adhesive or a binder for fixing the sealing material, and it is not necessary to completely evaporate the adhesive or the binder. The exhaust time can be shortened. Furthermore, when the sealant is fixed with a stopper, when the product that has not reached a sufficient vacuum degree is evacuated again, the sealant is sealed from the gap side between the inner and outer containers and the exhaust port is exposed. Also, since the gap side is covered with the stopper, even if the exhaust port is formed again on the convex part, the sealing material is fixed without chipping or peeling and scattering. It can be regenerated without arranging the encapsulant, and the manufacturing cost can be reduced. Also,
When fixing the sealing material, it is also possible to fix it with a getter, and it is not necessary to use a stopper, an adhesive, or a binder, and the process can be simplified.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a double container for explaining a first example of a manufacturing method according to the present invention.

FIG. 2 is a sectional view of an essential part showing an example of a metal vacuum double container of the present invention.

FIG. 3 is a cross-sectional view of a double container for explaining a second example of the manufacturing method according to the present invention.

FIG. 4 is a sectional view of a double container for explaining a third example of the manufacturing method according to the present invention.

5 is a plan view of the bottom of the double container shown in FIG. 4. FIG.

FIG. 6 is a cross-sectional view of a double container for explaining a fourth example of the manufacturing method according to the present invention.

[Explanation of symbols]

1 ... inner container, 2 ... outer container body, 3 ... outer container bottom member, 4 ... outer container, 5 ... void, 6 ... vacuum heat insulating layer,
7 ... Convex part, 8 ... Exhaust port, 9 ... Metal brazing material (sealing material), 10 ... Long groove, 11 ... Slit-shaped long hole (exhaust port), 12 ... Stopper, 13 ... Getter, 14 ... Low temperature molten glass, A, B, C, D ... Double container.

Front page continuation (72) Inventor Seiichi Ito 1-16-7 Nishishimbashi, Minato-ku, Tokyo Inside Nihon Oxygen Co., Ltd.

Claims (4)

[Claims] 1. A metal vacuum double container comprising a metal inner container and an outer container, wherein a space between the inner and outer containers is a vacuum heat insulating layer, wherein an exhaust port formed in the double container is inside and outside. A metal vacuum double container characterized in that it is vacuum-sealed with a sealing material from the void side of the container. 2. A method of manufacturing a metal vacuum double container comprising a metal inner container and an outer container, wherein a space between the inner and outer containers is a vacuum heat insulating layer, wherein either the inner container or the outer container is used. In the vicinity of the exhaust port formed in the crab, a sealing material is arranged on the side of the gap between the inner and outer containers, the inner container and the outer container are joined to form a double container, and then the double container is vacuumed. A metal vacuum double container characterized by being placed in a heating furnace and vacuum-evacuating the gap between the inner and outer containers, and then softening and flowing the sealing material to seal the exhaust port from the gap side between the inner and outer containers. Manufacturing method. 3. The method for producing a metal vacuum double container according to claim 2, wherein the sealing material is fixed in the double container with a stopper. 4. The method for manufacturing a metal vacuum double container according to claim 3, wherein the stopper for fixing the sealing material is a getter or a getter holder.