JPH1075903A - Method for hermetic sealing metallic vacuum double vessels - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the vacuum degree of metallic a vacuum double vessel and to improve the quality of these metallic vacuum double vessel having an excellent heat insulating property by utilizing an indirect melting method for using a guiding implement so as to allow a ceramic brazing filler metal heated in the position upper than a discharge hole to fall at the time of hermetically sealing the discharge hole bored at the outside vessel of the metallic vacuum double vessel by the ceramic brazing filler metal, thereby assuring sufficient vacuum evacuating time for evacuating the space of the metallic vacuum double vessel. SOLUTION: The discharge hole 12 and a groove part 13 arranged concentrically with the discharge hole 12 are formed in the suitable position of the flat part of the base 11 of the outside vessel 20. The guide implement 40 having a discharge port 41 and outflow holes 42 and 43 is placed in the position higher than the discharge hole 12 and, thereafter, the ceramic brazing filler metal 2 is placed in 43 of this guide implement 40 and, in this state, the vessel is vacuum evacuated in a vacuum heating furnace. Simultaneously, the vessel is heated up to a primary heating temp. and the ceramic brazing filler metal is heated up, thereby gases are allowed to flow out. The space part 30 of the metallic vacuum double vessels 100 are vacuum evacuated by a secondary heating temp. and simultaneously, the ceramic brazing filler metal 2 placed in the brazing filler metal mounting port 43 of the guide implement 40 is dropped in the sufficiently stable heated and molten state. The dropped ceramic material 2 well hermetically seals the discharge hole 12 of the outside vessel 20 without spreading on the base 11 by the surface tension of the groove part 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for sealing a metal vacuum double container. More specifically, the present invention relates to a method for sealing a metal vacuum double container so as to increase the degree of vacuum of the metal vacuum double container. At the time of evacuation, the ceramic brazing material is allowed to fall at a predetermined distance from the exhaust hole of the outer container, and a groove is formed concentrically in the exhaust hole, and the ceramic brazing material dropped from the exhaust hole is located on a plane. It does not spread due to the surface tension due to the exhaust hole or the groove on the outer peripheral edge thereof, and does not spread. By sealing the exhaust hole, the degree of vacuum of the metal vacuum double container is increased, the heat storage stability is improved, the quality is improved, and the satisfaction of consumers is improved. The present invention relates to a method for sealing a metal vacuum double structure capable of increasing the pressure.

[0002]

2. Description of the Related Art In general, metal vacuum double containers are most widely used among storage containers for keeping and storing liquid contents. Manufactures a metal vacuum double container by removing air in a vacuum section composed of a metal vacuum double container consisting of an inner container and an outer container to form a heat insulating layer by vacuum.

[0003] In such a method of manufacturing a vacuum double container made of metal, generally, an inner container and an outer container are joined to form a double container, and an inner bottom surface of the inner / outer container and an appropriate bottom surface of the outer container. Equipped with an exhaust port at the position to incinerate oils or foreign substances adhering to the peripheral wall of the metal vacuum double container by heating in the vacuum heating furnace, The air in the space between them is evacuated to a vacuum to produce a metal vacuum double container.

At this time, after evacuation in a vacuum heating furnace, the exhaust hole provided on the bottom surface of the outer container of the double container is inevitably sealed. Maintains vacuum, that is, it directly affects the heat insulation effect of the metal vacuum double container, which affects the performance of the product. It is a very important part of the metal vacuum double container.

[0005] Japanese Patent Application Laid-Open (JP-A) No. 6-169850 is an example of such an exhaust hole sealing method. The method for producing a metal vacuum double container includes an exhaust port on the bottom surface of the double container in which the inner container and the outer container are joined so as to provide an appropriate space and provide a space between the inner container and the outer container. After a solid brazing material that can be welded at a low temperature is placed in the furnace, it is heated in a vacuum heating furnace to evacuate the space, and then the brazing material is melted to seal the exhaust hole.

However, when the brazing material for sealing the exhaust hole of the metal vacuum double container is melted (vapor pressure) by such a sealing method, a chemical action occurs in the brazing material, and in particular, the brazing material is inevitable from the joining material. Gas is generated, and the generation of the gas causes the phenomenon of expansion of the brazing material, and the expansion phenomenon lowers the density due to relaxation of the particle structure of the brazing material, and in extreme cases, loses the airtightness of the sealed part and causes disposal. For example, there is a problem that the defective rate increases due to processing.

Further, since such a sealing method is a low-temperature welding method, there is a cost saving effect of power consumption. However, since the exhaust port is sealed in a state where the degree of vacuum of the metal vacuum double container is low, a thermos bottle is provided. However, there is a problem that the heat insulation effect is reduced, and the performance of the product is also reduced.

As another example of the above-described method of sealing the exhaust hole, there is Japanese Utility Model Laid-Open No. 3-119342. In this metal vacuum double container, a metal inner bottle and a metal outer bottle are joined at an inlet, and a gap between the inner and outer bottles has a vacuum heat insulating layer in a metal vacuum double container. A concave portion is formed in the outer bottle, an exhaust hole for vacuum exhaust is formed in the concave portion, and the exhaust hole is sealed by injecting a brazing material.

However, in such a sealing method, in the process in which the brazing material is heated in a vacuum heating furnace, the gas escapes and generates a boiling phenomenon, and is welded while closing the exhaust port. Since the gas cannot be completely released and the hermetic seal is formed, air bubbles and the like remain, and the hermetic seal is broken even by a small impact, and there is a problem that the vacuum is broken.

In addition, since the space between the exhaust hole and the brazing material is close and the direct melting and sealing method is used, when the brazing material is heated, harmful gases such as organic substances, impurities, and binder mixed therein flow into the vacuum part and have a heat insulating effect. Had the problem of falling.

[0011]

SUMMARY OF THE INVENTION The present invention was devised in order to solve the above-mentioned various problems, and is directed to a method of indirectly melting a ceramic brazing material for sealing an exhaust hole of a metal vacuum double container. By melting using the guide, the volume of the metal vacuum double container can be made larger than before,
In the process of heating the ceramic brazing material on the guide in the indirect melting method, gas is completely released, and the ceramics seals the exhaust holes with surface tension in a sufficiently stable state, so that sufficient vacuum evacuation time is secured. Of course, it is an object of the present invention to provide a method of sealing a metal vacuum double container, which is capable of improving heat insulation and improving the performance of a product by improving the heat insulating property by the good quality sealing.

[0012]

In order to achieve the above-mentioned object, the present invention provides a metal inner / outer container 10,20.
Are connected to each other to form a metal vacuum double container 100 having a space 30, and the space 30 is evacuated to an appropriate position of the outer container 20 of the metal vacuum double container 100. An exhaust hole 12 is formed, and the exhaust hole 12 is disposed at an appropriate position on the bottom surface 11 of the outer container 20 in the method of sealing a metal vacuum double container in which the exhaust hole 12 is sealed with the ceramic brazing material 2 in a vacuum heating furnace. An exhaust hole 12 and a groove 13 concentrically disposed in the exhaust hole 12 are formed.
The outlet 41 and the outlet 42 are provided at appropriate intervals above the
After the guide 40 having the wax mounting port 43 is placed thereon, the ceramic brazing material 2 is placed in the wax mounting port 43 of the guide 40, and the primary heating temperature is reached while evacuating in a vacuum heating furnace. The temperature is raised, the ceramic brazing material 2 is heated and the gas is allowed to flow out. Then, the temperature is further raised to the secondary heating temperature to evacuate the space 30 of the metal vacuum double container 100, and The ceramic brazing material 2 placed in the brazing hole 43 is dropped in a sufficiently stable heating and melting state, and the dropped ceramic brazing material 2 is
And solidifies while preventing it from spreading on the bottom surface by the surface tension of the outer container 20 to seal the exhaust hole 12 of the outer container 20.

The present invention also relates to an inner / outer container 1 made of metal.
The mouths 0 and 20 are joined to each other to form a metal vacuum double container 100 having a space 30, and the space 30 is evacuated to an appropriate position of the outer container 20 of the metal vacuum double container 100. In a method of sealing a metal vacuum double container in which a vacuum exhaust furnace 12 is formed and the exhaust hole 12 is sealed with a ceramic brazing material 2 in a vacuum heating furnace, the bottom surface 11 of the outer container 20 is appropriately sealed. An exhaust hole 12 disposed at a position and a braze receiving portion 50 fixed below the exhaust hole 12 are formed, and an exhaust port 41, an outflow hole 42, and a brazing mount are provided above the exhaust hole 12 at appropriate intervals. After the guide tool 40 having the opening 43 is placed, the wax mounting port 43 of the guide tool 40 is placed.
With the ceramic brazing material 2 placed thereon, the temperature is raised to the primary heating temperature while evacuating in a vacuum heating furnace to heat the ceramic brazing material 2 and allow gas to flow out.
The space 30 of the metal vacuum double container 100 is evacuated by elevating the temperature to the secondary heating temperature and, at the same time, the ceramic brazing material 2 placed in the brazing port 43 of the guide 40 is sufficiently heated and melted. The exhaust hole 12 of the outer container 20 is sealed by dropping the ceramic brazing material 2 in a state and solidifying the dropped ceramic brazing material 2 at the brazing receiving portion 50.

Further, the braze receiving portion 50 of the present invention has a concave portion 51, and the flanges 52 formed on both upper sides of the concave portion 51 are spot-welded so as to be located in the space portion 30 of the outer container 20. And an exhaust gap 53 orthogonal to the flange 52 is formed.

The present invention also relates to an inner / outer container 1 made of metal.
The mouths 0 and 20 are joined to each other to form a metal vacuum double container 100 having a space 30, and the space 30 is evacuated to an appropriate position of the outer container 20 of the metal vacuum double container 100. In a method of sealing a metal vacuum double container in which an exhaust hole 12 is formed and the exhaust hole 12 is sealed with a ceramic brazing material 2 in a vacuum heating furnace, a flat position of the bottom surface 11 of the outer container 20 is formed. An exhaust hole 12 is formed in the exhaust hole 1.
At an appropriate interval above the exhaust port 41 and the outlet hole 4
After the guide 40 having the soldering port 2 and the wax mounting port 43 is placed thereon, the primary heating temperature is evacuated in a vacuum heating furnace while the ceramic brazing material 2 is placed in the wax mounting port 43 of the guide 40. And the gas is discharged while heating the ceramic brazing material 2. Then, the temperature is further raised to the secondary heating temperature to evacuate the space 30 of the metal vacuum double container 100, and at the same time, the guide 40 The ceramic brazing material 2 placed in the soldering port 43 is dropped in a sufficiently stable heating and melting state, and the dropped ceramic brazing material 2
And solidifies while preventing it from spreading on the bottom surface by the surface tension of the outer container 20 to seal the exhaust hole 12 of the outer container 20.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

(Embodiment 1) FIG. 1 is a partial sectional view of a metal vacuum double container hermetically sealed according to the present invention.
The metal vacuum double container 100 joins the metal inner container 10 and the metal outer container 20 to each other at their mouths, and a space 30 serving as a vacuum heat insulating layer between the inner and outer containers 10 and 20. Is configured. FIGS. 2 and 3 show a first embodiment of the present invention, showing a state before and after sealing with a ceramic brazing material in an outer container in a metal vacuum double container.

A metal vacuum double container 100 having a space 30 by joining the openings of metal inner and outer containers 10 and 20 to each other.
Is formed, and the outer container 20 of the metal vacuum double container 100 is formed.
An exhaust hole 12 for evacuating the space portion 30 is formed at an appropriate position in the metal vacuum double container in which the exhaust hole 12 is sealed with the ceramic brazing material 2 in a vacuum heating furnace. An appropriate position on the bottom surface 11 of the outer container 20,
For example, an exhaust hole 12 for evacuating the space portion 30 is formed in a plane portion, and a groove 13 formed concentrically in the exhaust hole 12 and an appropriate space above the exhaust hole 12 are provided. After the guide 40 having the exhaust port 41, the outflow hole 42, and the wax mounting port 43 is placed thereon, the guide 4
In a state where the ceramic brazing material 2 is placed in the brazing hole 43, the temperature is raised to the primary heating temperature while evacuating in a vacuum heating furnace to heat the ceramic brazing material 2 and to cause gas to flow out. At the same time, the space 30 of the metal vacuum double container 100 is evacuated by elevating the temperature to the secondary heating temperature, and at the same time, the ceramic brazing material 2 placed in the brazing port 43 of the guide 40 is sufficiently heated and melted. Drop it in a state,
The fallen ceramic brazing material 2 is solidified while preventing it from spreading on the bottom surface due to the surface tension with the groove portion 13, and the outer vessel 2
That is, the zero exhaust hole 12 is sealed.

The present invention, as illustrated in FIGS.
Since the bottom surface 11 of the outer container 20 constituting the metal vacuum double container 100 can be made smooth, the volume of the inner container 10 can be increased, and the molding process can be simplified. And
An exhaust hole 12 for evacuating the space 30 of the metal vacuum double container 100 is formed at an appropriate position on the bottom surface 11, and a groove 13 is formed concentrically in the exhaust hole 12. It is preferable that a part of the ceramic brazing material 2 that is heated and melted and that seals the exhaust hole 12, and the remaining ceramic brazing material 2 be formed so as not to flow due to surface tension with the groove 13.

In the present invention, the guide 40 is used in the vacuum sealing method. The guide 40 is formed in a circular plate shape similar to the bottom surface 11 of the outer container 20 of the metal vacuum double container 100. When placed on the bottom surface 11, the exhaust hole 1
2 so that the gap between the support portion 44 and the support 2 can be appropriately maintained.
It is constituted so that it may have. A brazing hole 43 having an outflow hole 42 formed therein is formed in the center of the guide 40, and the ceramic brazing material 2 as a sealing member is placed here. The ceramic brazing material 2 is melted in a vacuum heating furnace. It is made to fall through the outflow hole 42. On the other hand, when the guide member 40 is placed on the bottom surface 11 of the outer container 20, it is preferable that the exhaust hole 12 of the bottom surface 11 and the outflow hole 42 of the guide member 40 are formed coaxially at a slightly eccentric position. A plurality of exhaust ports 41 are formed outside the mounting port, and are formed so that the gas evacuated from the space 30 of the metal vacuum double container 100 can be exhausted.

FIGS. 2 and 3 are explanatory views of a sealing method illustrating a first embodiment of the present invention. The present invention will be described in detail as follows.

In the present invention, an organic substance such as oils and foreign substances adhered to the periphery of the metal vacuum double container 100 while passing through the metal vacuum double container 100 through a multi-stage electrothermal vacuum heating furnace. Is incinerated and evacuated. This processing step is the same as the existing method.

In the present invention, after passing through the multi-stage vacuum heating furnace as described above, the space 30 of the metal vacuum double container 100 is evacuated in the final stage vacuum furnace, and then the evacuation holes 12 are formed. As shown in FIG. 2, a guide 40 is placed on a bottom surface 11 of a metal vacuum double container 100, and the guide 40 thus placed is soldered. Before the ceramic brazing material 2 placed on the mounting port 43 is heated, the space 3 of the metal vacuum double container 100 is raised while the vacuum heating furnace is raised to a predetermined heating temperature.
0 is evacuated, and the ceramic brazing material 2 placed in the brazing port 43 of the guide 40 is heated to start melting.

At this time, the ceramic brazing material 2 is
In the process of heating on the wax mounting port 43 of the guide 40 located at a position higher than the position of the exhaust hole 12 for evacuating the space 30 on the bottom surface 11 of the vacuum chamber 0, the temperature of the vacuum heating furnace is gradually increased and the primary heating is performed. When the temperature reaches the temperature and the inside of the vacuum heating furnace is heated to the vapor pressure or more, gas is generated from the heated ceramic brazing material 2, and the vacuum evacuation process is performed in such a state to obtain the highest possible degree of vacuum. It is.

After the vacuum heating furnace is maintained at the primary heating temperature and a predetermined time has elapsed, the ceramic brazing material 2
The gas discharge and swelling phenomenon are eliminated. When the ceramic brazing material 2 of the pure component in the gelled state is further heated and reaches the secondary heating temperature, the ceramic brazing material 2 melts and flows out of the brazing hole 43 of the guide 40. It falls from the hole 42 and naturally flows into the exhaust hole 12 formed on the bottom surface 11 of the outer container 20, and the exhaust hole 12 formed on the bottom surface 11 of the outer container 20 as shown in FIG. The exhaust hole 42 formed on the bottom surface 11 of the outer container 20 is sealed by the coaxial line between the outlet hole 42 of the guide 40 and the guide member 40 placed at a fixed interval above the upper surface 11. . Further, the present invention is a sealing method by indirect melting, in which the harmful gas is completely released in the process of heating the ceramic brazing material 2 by the guide 40, and the ceramic brazing material 2 seals the exhaust hole 12 in a sufficiently stable state. By doing so, it is possible not only to secure a sufficient vacuum time, but also to improve the quality with good quality sealing.

As described above, after the vacuum sealing process is performed and the ceramic brazing material 2 is hardened, and the vacuum process of the metal vacuum double container 100 is completed, the guide 40 may be removed, and the guide member 40 is removed. The guide 40 can be continuously reused.

(Embodiment 2) FIGS. 4 and 5 show a second embodiment of the present invention.
In the embodiment, in a metal vacuum double container, the state before and after sealing with a ceramic brazing material in an outer container is shown, and the same configurations as those in FIGS. 2 and 3 are denoted by the same reference numerals. Description is omitted. Metal vacuum double container 1 having a space 30 by joining the openings of metal inner and outer containers 10 and 20 to each other
00, an exhaust port 12 for evacuating the space 30 is formed at an appropriate position on the outer container 20 of the metal vacuum double container 100, and the exhaust port 12 is connected to a ceramic brazing material by a vacuum heating furnace. In a method of sealing a metal vacuum double container sealed at 2, an exhaust port 12 for evacuating the space portion 30 is formed at an appropriate position of the outer container 20, for example, a plane portion thereof. A solder receiving portion 50 spot-welded at a lower portion of the exhaust port 12 and a guide 40 having an exhaust port 41, an outflow hole 42, and a wax mounting port 43 are placed at an appropriate interval above the exhaust hole 12. After the ceramic brazing material 2 is placed in the brazing hole 43 of the guide 40, the temperature is raised to the primary heating temperature while evacuating in a vacuum heating furnace, and the ceramic brazing material 2 is heated to a gas. Outflow, and further The temperature was raised to the secondary heating temperature space portion 30 of the metallic vacuum double container 100 and at the same time evacuated,
The ceramic brazing material 2 placed in the brazing port 43 of the guide 40 is dropped in a sufficiently stable heated and molten state, and the exhaust hole 12 of the outer container 20 is removed by the braze receiving portion 50 so that the ceramic brazing material 2 can be removed therefrom. Is sealed while stopping it from flowing down.

The braze receiving portion 50 has a concave portion 51, and flanges 5 formed on both upper sides of the concave portion 51 are formed.
2 is spot-welded so as to be located in the space 30 of the outer container 20, and the exhaust gap 5 orthogonal to the flange 52 is formed.
Form 3

The present invention, as illustrated in FIGS.
An exhaust hole 12 for evacuating the space 30 of the metal vacuum double container 100 is formed at an appropriate position on the bottom surface 11 of the outer container 20 of the metal vacuum double container 100. The braze receiving portion 50 having the concave portion 51 is fixed, and the flange 52 of the braze receiving portion 50 is fixed by spot welding so as to be located inside the bottom surface 11 where the exhaust port 12 is opened, that is, in the space 30. At the same time
An exhaust gap 53 orthogonal to the flange 52 is formed. The molten ceramic brazing material 2 that has passed through the exhaust holes 12
The gas accumulates in the concave portion 51 of the braze receiving portion 50, and the exhaust gap 53 and the exhaust hole 12 are sequentially sealed. The exhaust hole 12 preferably has a size that does not generate a surface tension when the ceramic brazing material 2 flows therein, and the exhaust gap 53 preferably has a size that does not flow due to the surface tension.

FIGS. 4 and 5 are views for explaining a sealing method according to a second embodiment of the present invention. The present invention will be described in detail as follows. In the present invention, oils attached to the periphery of the metal vacuum double container 100 while passing through the metal vacuum double container 100 through a multi-stage electric heating furnace,
Perform a process of incinerating and evacuating organic substances such as foreign substances. This processing step is the same as the existing method.

In the present invention, after passing through the multi-stage vacuum heating furnace as described above, the space portion of the metal vacuum double vessel 100 is evacuated in the final stage vacuum furnace, and then the exhaust holes 1 are formed.
2 and a sealing method for sealing the exhaust gap 53. As shown in FIG.
The guide member 40 is placed on the bottom surface 11 of the base material, and the ceramic brazing material 2 placed on the wax mounting port 43 of the guide member 40 thus placed is heated to start melting.

At this time, the ceramic brazing material 2 is
The guide 40 located at a position higher than the position of the exhaust hole 12 and the exhaust gap 53 for evacuating the space 30 on the bottom surface 11
In the process of heating on the brazing port 43, the temperature of the vacuum heating furnace is gradually increased to reach the primary heating temperature, and when the inside of the vacuum heating furnace is heated to a vapor pressure or more, the heated ceramic brazing material is used. Gas is generated from 2 and the vacuum evacuation process is performed in such a state to obtain the highest possible degree of vacuum.

After the vacuum heating furnace is maintained at the primary heating temperature and a predetermined time has elapsed, the discharge of the gas and the expansion of the ceramic brazing material 2 are eliminated. Then, when the ceramic brazing material 2 of the pure component in the heated and gelled state is further heated to reach the secondary heating temperature, the ceramic brazing material 2 is melted and the solder mounting port 4 of the guide 40 is formed.
3, flows naturally into the exhaust hole 12 formed in the bottom surface 11 of the outer container 20 through the outflow hole 42, and the exhaust hole 12 formed in the bottom surface 11 of the outer container 20 and the bottom surface as shown in FIG. 11 and the outflow hole 42 of the guide 40 which is placed at a certain interval on the coaxial line,
The ceramic brazing material 2 that has fallen into the exhaust hole 12 formed in the bottom surface 11 of the outer container 20 and has fallen through the exhaust hole 12 again and accumulates in the concave portion 51 of the braze receiving portion 50. Thus, the exhaust gap 53 is sealed. In addition, the present invention is a sealing method by indirect melting, in which the harmful gas is completely released in the process of heating the ceramic brazing material 2 by the guide member 40, and the ceramic brazing material 2 is evacuated to the exhaust hole 12 and exhausted in a sufficiently stable state. Gap 5
By sealing 3, sufficient vacuum time can be ensured, and of course, quality can be improved by high-quality sealing.

(Embodiment 3) FIGS. 6 and 7 show a third embodiment of the present invention.
In the embodiment, in a metal vacuum double container, a state before and after sealing with a ceramic brazing material in an outer container is shown, and the same configurations as in FIGS. 2 and 3 are denoted by the same reference numerals. The description is omitted. The bottom surface 11 of the outer container 20 constituting the metal vacuum double container 100 is formed flat, and
The exhaust hole 12 is opened at an appropriate position.

That is, since the bottom surface 11 of the outer container 20 constituting the metal vacuum double container 100 can be flattened,
Can be increased, and the molding process can be simplified. An exhaust hole 12 for evacuating the space portion 30 of the metal vacuum double container 100 is formed at an appropriate position on the bottom surface 11, and a guide 40 mounted at a predetermined interval in the exhaust hole 12 is brazed. The ceramic brazing material 2 is placed in the opening 43, and the exhaust hole 12 is sealed with the ceramic brazing material 2 that is heated and dropped in a sufficiently stable molten state on a vacuum heating furnace, and the surface of the ceramic brazing material 2 that falls. It is formed to a size that does not flow due to tension.

[0036]

As described above, according to the present invention, when an exhaust hole formed in an outer container of a metal vacuum double container is sealed with a ceramic brazing material, the ceramic brazing material heated above the position of the exhaust hole. By using an indirect melting method that uses a guide so that the metal can fall, the vacuum level of the metal vacuum double container can be ensured by ensuring sufficient vacuum evacuation time to evacuate the space of the metal vacuum double container. The effect is that the heat retention is excellent and the quality of the metal vacuum double container can be improved. Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and can be modified within the scope described in the claims.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view of a metal vacuum double container sealed according to the present invention.

FIG. 2 is a cross-sectional view showing a first embodiment of the present invention and showing a state before sealing of the metal vacuum double container according to the present invention.

FIG. 3 is a cross-sectional view showing the first embodiment of the present invention and showing a state after sealing of the metal vacuum double container according to the present invention.

FIG. 4 is a cross-sectional view showing a second embodiment of the present invention and showing a state before the metal vacuum double container according to the present invention is sealed.

FIG. 5 is a cross-sectional view showing a second embodiment of the present invention and showing a state after the metal vacuum double container according to the present invention is sealed.

FIG. 6 is a cross-sectional view showing a third embodiment of the present invention, in which a metal vacuum double container according to the present invention is in a state before sealing.

FIG. 7 is a cross-sectional view showing a third embodiment of the present invention, in which a metal vacuum double container according to the present invention has been sealed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 100 Vacuum double container 10 Inner container 20 Outer container 30 Space 2 Ceramic brazing material 11 Bottom surface 12 Exhaust hole 13 Groove 40 Guide 41 Exhaust port 42 Outflow hole 43 Brazing mounting port 50 Brazing stopper 51 Depression 52 Flange 53 Exhaust Gap

Claims (4)

[Claims] 1. A metal vacuum double container 10 having a space 30 by joining the openings of metal inner and outer containers 10 and 20 to each other.
0, and the outer container 2 of this metal vacuum double container 100
In a method for sealing a metal vacuum double container, an exhaust hole 12 for evacuating the space portion 30 is formed at an appropriate position in the vacuum heating furnace, and the exhaust hole 12 is sealed with the ceramic brazing material 2 in a vacuum heating furnace. An exhaust hole 12 disposed at an appropriate position on the bottom surface 11 of the outer container 20 and a groove 13 disposed concentrically in the exhaust hole 12 are formed, and at an appropriate interval above the exhaust hole 12, After the guide 40 having the exhaust port 41, the outflow hole 42, and the wax mounting port 43 is placed, and the ceramic brazing material 2 is placed in the wax mounting port 43 of the guide 40, a vacuum is applied in a vacuum heating furnace. The temperature is raised to the primary heating temperature while evacuating, heating the ceramic brazing material 2 and causing gas to flow out. Then, the temperature is further raised to the secondary heating temperature to evacuate the space 30 of the metal vacuum double container 100. At the same time, guide 4 The ceramic brazing material 2 placed in the soldering port 43 is dropped in a sufficiently stable heating and melting state, and solidified while preventing the dropped ceramic brazing material 2 from spreading on the bottom surface due to surface tension with the groove 13. And sealing the exhaust hole 12 of the outer container 20. 2. A metal vacuum double container 10 having a space 30 by joining the openings of metal inner and outer containers 10 and 20 to each other.
0, and the outer container 2 of this metal vacuum double container 100
A method of sealing a metal vacuum double container in which an exhaust hole 12 for evacuating the space 30 is formed at an appropriate position of the vacuum vessel and the exhaust hole 12 is sealed with the ceramic brazing material 2 in a vacuum heating furnace. In the above, an exhaust hole 12 disposed at an appropriate position on the bottom surface 11 of the outer container 20 and a brazing stopper 50 fixed below the exhaust hole 12 are formed.
The outlet 41 and the outlet 42 are provided at appropriate intervals above the
After the guide 40 having the solder mounting port 43 and the ceramic brazing material 2 is mounted on the wax mounting port 43 of the guide 40, the primary heating temperature is set while evacuation is performed in a vacuum heating furnace. To heat the ceramic brazing material 2 and allow the gas to flow out. Then, the temperature is raised to the secondary heating temperature to evacuate the space 30 of the metal vacuum double container 100, and The ceramic brazing material 2 placed in the brazing hole 43 is dropped in a sufficiently stable heat-melting state, and the dropped ceramic brazing material 2 is solidified by the braze receiving portion 50, so that the exhaust hole 12 of the outer container 20 is formed.
A method for sealing a metal vacuum double container, characterized in that the container is sealed. 3. The solder receiving portion 50 has a concave portion 51, and flanges 5 formed on both upper sides of the concave portion 51 are provided.
3. The metal according to claim 2, wherein said second metal is spot-welded and fixed so as to be located in the space portion of said outer container, and an exhaust gap perpendicular to said flange is formed. Sealing method for vacuum double containers. 4. A metal vacuum double container 10 having a space 30 by joining the openings of metal inner and outer containers 10 and 20 to each other.
0, and the outer container 2 of this metal vacuum double container 100
In a method for sealing a metal vacuum double container, an exhaust hole 12 for evacuating the space portion 30 is formed at an appropriate position in the vacuum heating furnace, and the exhaust hole 12 is sealed with the ceramic brazing material 2 in a vacuum heating furnace. An exhaust hole 12 is formed at a flat position on the bottom surface 11 of the outer container 20, and a guide 40 having an exhaust port 41, an outlet hole 42, and a wax mounting port 43 is provided above the exhaust hole 12 at appropriate intervals. After being placed, the guide 4
In the state where the ceramic brazing material 2 is placed in the brazing hole 43, the temperature is raised to the primary heating temperature while evacuating in a vacuum heating furnace, and the ceramic brazing material 2 is heated and gas is discharged. The space 30 of the metal vacuum double container 100 is evacuated by elevating the temperature to the secondary heating temperature and, at the same time, the ceramic brazing material 2 placed in the brazing port 43 of the guide 40 is sufficiently heated and melted. Drop it in a state,
The fallen ceramic brazing material 2 solidifies while preventing the ceramic brazing material 2 from spreading on the bottom surface due to the surface tension with the bottom surface 11.
A method for sealing a metal vacuum double container, wherein the exhaust hole 12 is sealed.