JP2734981B2 - Vacuum sealed structure of metal vacuum container - 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 sealing structure for a metal vacuum container such as a stainless steel bottle.

[0002]

2. Description of the Related Art For example, as a vacuum insulation container such as a metal thermos such as a stainless steel bottle, a metal inner bottle and an outer bottle are joined at a mouth to form a double structure, and a gap between the inner and outer metal bottles is formed. What is vacuum-sealed is generally known.

[0003] First, Fig. 49 shows the entire structure of the vacuum insulation container 1 before vacuum sealing. The vacuum insulation container 1 has an inner container 1A made of a metal such as stainless steel and an outer container 1B. The two sides are joined to each other to form a double structure, and the heat insulating structure is realized by vacuum-sealing after evacuating the gap 3 formed therebetween.

The inner container 1A has a bottomed bottle shape as shown in the figure, and is supported by the outer container 1B at the mouth 2 side. Further, the outer container 1B is formed as a bottomed cylindrical body in which the bottom plate 60 is integrally fitted (inwardly fitted) to the inside of the opening edge 50 on the bottom 4 side whose diameter has been reduced by a predetermined dimension.

The bottom plate 60 is formed by bending a peripheral edge portion 60a into a hook shape and bulging outward in a cylindrical shape with a ring-shaped groove portion being left between the central portion and the peripheral edge portion 60a.

Then, on the bottom surface of the bulging portion of the bottom plate 60,
As shown in the figure, a large-diameter concave portion 60b is formed on the inner side in the axial direction by a predetermined depth. A large-diameter exhaust port 60c is formed on the inner bottom surface of the concave portion 60b.

At the time of vacuum sealing, first, the inner container 1A and the inner cavity 3 of the outer container 1B are evacuated in a vacuum chamber, and then the exhaust port 60c is inserted into the illustrated container in an inverted state as shown in the drawing. A sealing plate 61 is placed between the opening edge of the exhaust port 60c via a brazing material, and then heated at a temperature equal to or higher than the melting point of the brazing material, thereby melting the brazing material to form A structure in which the sealing plate 61 and the bottom plate 60 are joined and integrated to perform vacuum sealing (for example,
FIG. 11 of JP-A-267023 or Japanese Utility Model Application Laid-Open No. 4-7026.
No. 5, FIG.

In the case of such a conventional exhaust structure, the diameter of the exhaust port 60c can be made sufficiently large, so that the total conductance at the time of exhaust can be increased. There are issues that need to be addressed. Further, in addition to the difficulty in positioning the sealing plate 61 with respect to the exhaust port 60c and uniformly disposing the brazing material at the opening edge of the exhaust port 60c, the brazing material is used only because the exhaust port 60c itself has a large diameter and a large fusion area. Since it is difficult to secure the fusion accuracy, there is also a problem in the reliability of the sealing accuracy.

Therefore, as shown in FIGS. 50 and 51 to 53, for example, the bulging portion of the bottom plate 60 is formed as a flat surface 60d.
An arc-shaped concave portion 64 or a funnel-shaped concave portion 65 having an extremely small diameter such that the molten brazing material 43 can be stopped by the surface tension at the time of sealing is provided at the center thereof, and exhaust ports 63 are formed at the bottom thereof. After the paste brazing material 43 is placed on the upper opening edge of the exhaust port 63, the paste brazing material 43 is introduced into the exhaust chamber to melt the brazing material 43, so that the exhaust port 63 is melted.
(See FIGS. 1 to 3 of JP-A-3-66332 and FIGS. 1 to 3 of JP-A-4-7026) and, for example, FIGS. 56,
Similarly, as shown in FIGS.
The bulging portion is a flat surface 65d, and a relatively large-diameter hemispherical concave portion 66 or a long groove 67 whose bottom is inclined is provided at the center portion thereof. An exhaust port 63 having such a small diameter that the molten brazing material 43 can be stopped by the surface tension at the time of sealing is formed at the position, and the solder on the paste is formed on the peripheral portion of the semispherical recess 66 or the other end of the long groove 67. After placing the material 43, the material is introduced into the exhaust chamber and melted, and the molten brazing material is guided to the exhaust port 63 portion using the round surface or the inclined surface to securely seal the exhaust port 63. Also, an exhausting structure has been proposed (see, for example, FIGS. 1 to 3 and FIGS. 4 to 5 of JP-A-3-119342).

[0010]

However, in the case of the former configuration, if the carrier frame swings during movement to the exhaust chamber, the brazing material 43 is likely to fall off, and a hemispherical concave portion is formed during melting. There is a possibility that it may flow out from the rim of the opening 66, and there is a drawback that it does not always flow into the exhaust port 63 reliably. In the case of the latter configuration, if the paste-like brazing material 43 is not injected into the other end portion of the narrow narrow groove 67 accurately after the evacuation, the molten brazing material surely enters the minute-diameter exhaust port 63. There is a similar problem of not filling, which has the disadvantage of being difficult to automate.

[0011]

SUMMARY OF THE INVENTION The inventions of the present application have been made to solve the above-mentioned conventional problems, and are provided with the following means for solving the problems.

[0012] That is, the vacuum sealing structure of the metal vacuum container according to the first aspect of the present invention is a metal vacuum container having a metal inner container and an outer container having a double structure through a gap. A solid sealing material is adopted, and a solid sealing material fitting recess for fitting the solid sealing material is formed at a predetermined position on the bottom of the outer container. The solid sealing material fitting recess is formed in the solid sealing material fitting recess. At the same time the sealing material is fitted, another recess having a predetermined depth is further provided at the bottom of the solid sealing material fitting recess into which the solid sealing material is fitted, and an exhaust port is provided at the bottom of the other recess. It is formed and formed.

Further, in the vacuum sealing structure of the metal vacuum heat insulating container according to the second aspect of the present invention, the solid sealing material is formed of a rod-shaped solid sealing material, and the solid sealing material fitting recess is formed of the rod-shaped solid sealing material. It has a long groove portion having a length corresponding to the length of the material.

Further, in the vacuum sealing structure for a metal vacuum heat insulating container according to the third aspect of the present invention, the solid sealing material is formed of a circular shape, and the solid sealing material fitting recess is formed of the circular solid shape. It has a circular groove having an inner diameter corresponding to the outer diameter of the sealing material.

[0015]

Operation and Effect Each invention of the present application has the following operation and effect corresponding to the above configuration.

That is, as described above, in the vacuum sealing structure of the metal vacuum heat insulating container according to the first aspect of the present invention, a solid sealing material is employed as the sealing material, and the solid sealing material is provided at a predetermined position on the outer container bottom plate. Since the solid sealing material fitting concave portion for fitting the solid sealing material corresponding to the solid sealing material is formed, the solid sealing material is securely positioned. On the other hand, by further providing another recess having a predetermined depth at the bottom of the solid sealing material fitting recess and forming an exhaust port at the bottom of the other recess, the molten sealing material can be reliably exhausted. Since the solid sealing material is positioned in the solid sealing material fitting recess, the solid sealing material positioned in the solid sealing material fitting recess is reliably exhausted by another recess after the melting of the solid sealing material fitting recess bottom. It will flow down to the mouth and be stored.

Further, as described above, in the vacuum sealing structure for a metal vacuum heat insulating container according to the second aspect of the present invention, in the structure according to the first aspect of the present invention, in particular, a rod-shaped solid sealing material is used as the sealing material. The solid sealing material fitting recess formed at a predetermined position of the outer container bottom plate is formed corresponding to the length of the rod-shaped solid sealing material, and the rod-shaped solid sealing material is formed by the long groove. Can be reliably positioned.

Further, as described above, in the vacuum sealing structure of the metal vacuum heat insulating container according to the third aspect of the present invention, in the configuration of the first aspect of the present invention, in particular, a circular solid sealing is used as a sealing material. A porous material is employed, and a solid sealing material fitting concave portion formed at a predetermined position of the outer container bottom plate is formed corresponding to the outer diameter of the circular solid sealing material, and the circular groove portion is used. The circular solid sealing material can be reliably positioned.

[0019]

(Embodiment 1) FIGS. 1 to 3 show a vacuum sealing structure of a metal vacuum insulation container according to Embodiment 1 of the present invention.

FIG. 1 shows the entire structure of the vacuum heat retaining container 1 in a container inverted state before vacuum sealing. The heat retaining container 1 includes an inner container 1A made of metal such as stainless steel and an outer container 1B. At the mouth 2 side, they are joined together to form a double structure,
By vacuum-sealing the gaps 3 formed therebetween, a heat-insulating structure capable of keeping a vacuum inside the inner container 1A is realized.

The inner container 1A has a bottomed bottle shape as shown in the figure, and is supported by the outer container 1B at the mouth 2 side. Further, the outer container 1B integrally fits the bottom plate 6 into the inside of the opening edge 5 on the side of the bottom 4 whose diameter has been reduced by a predetermined dimension.
(Inner fitting) is formed in a cylindrical body with a bottom.

The bottom plate 6 is formed by bending the peripheral edge portion 6a into a hook shape and bulging outward in an inverted trapezoidal shape after leaving a ring-shaped groove 7 between the central portion and the peripheral edge portion 6a. Have been.

At the center of the flat bottom surface 6b of the bottom plate 6, a flat rectangular solid sealing material fitting groove 8 recessed by a predetermined depth toward the inner container 1A as shown in the figure. Is formed. The bottom surfaces of the solid sealing material fitting grooves 8 are tapered surfaces 9a and 9b which gradually descend at predetermined inclination angles from both right and left ends to the exhaust port 10 in the inverted state of the container shown in FIG. Each lower end joins a flat surface portion 8a having an exhaust port 10 formed in the center. The tapered surfaces 9a and 9b are formed such that one side 9a is longer than the other. The exhaust port 10 is
It communicates with the space 3 between the inner container 1A and the outer container 1B.

In the metal vacuum insulation container 1 thus constructed before the vacuum sealing, as shown in FIGS. 2 and 3, for example, the tapered groove 9 is provided on the longer tapered surface 9a. A cylindrical solid brazing material 11 for vacuum sealing as shown in FIG.

Then, as described above, the solid brazing material 11
The metal vacuum insulated container 1 fitted with the is further transferred into a vacuum furnace and first degassed at a predetermined temperature lower than the melting point of the solid brazing material 11 (baking step). It is heated at a temperature higher than the melting point of the brazing material 11 (sealing step). As a result, the solid brazing material 11 melts and flows downward, and is guided by the tapered surface 9a of the solid sealing material fitting groove 8 to reach the exhaust port 10 formed at the center of the flat surface portion 8a. After stopping, the exhaust port 10 is securely filled and sealed as shown in FIG.

That is, in the exhaust structure of the metal vacuum heat insulating container of the present embodiment, the solid sealing material fitting groove 8 having tapered surfaces 9a, 9b descending to each other on the bulging portion bottom surface 6b at the center of the bottom plate 6. And an exhaust port 10 is formed at the center of the flat surface 8a where the tapered surfaces 9a and 9b of the solid sealing material fitting groove 8 merge downward.
The molten brazing material 11 is surely guided to the exhaust port 10 by the tapered surface 9 a of the solid sealing material fitting groove 8. Therefore, simply fitting the solid brazing material 11 having a columnar shape as shown in FIG. 4 into, for example, the one-side tapered surface portion 9a of the solid sealing material fitting groove 8 having a predetermined depth can easily and surely form, for example, a glass sealing material. It is possible to adopt a vacuum sealing method using a low melting point brazing material such as a hole.

As a result, the vacuum sealing operation can be performed at a lower temperature as compared with the conventional vacuum brazing method, the degree of decrease in the tensile strength of the container base material is small, and the container base material is reduced as much as possible. Can be reduced in thickness, and the weight and cost of the product can be reduced.

Moreover, since the brazing material is a solid in the shape of a columnar body and is securely fitted and fixed in the solid sealing material fitting groove 8 before being melted, the carrier frame temporarily shakes during the transfer. Even if it does, there is no danger of falling and the holding state is ensured.

(Embodiment 2) FIGS. 6 to 9 show a vacuum sealing structure of a metal vacuum insulation container according to Embodiment 2 of the present invention.

First, FIG. 6 shows the entire structure of the vacuum insulated container 1 in an inverted state before vacuum sealing. The vacuum insulated container 1 is made of metal such as stainless steel as in the case of the first embodiment. The inner container 1A and the outer container 1B are joined to each other on the side of the mouth 2 to form a double structure, and the space 3 formed therebetween is vacuum-sealed to maintain the vacuum inside the inner container 1A. A possible thermal insulation structure is realized.

The inner container 1A has a bottomed bottle shape as shown in the figure, and is supported by the outer container 1B on the mouth 2 side. Further, the outer container 1B integrally fits the bottom plate 6 into the inside of the opening edge 5 on the side of the bottom 4 whose diameter has been reduced by a predetermined dimension.
(Inner fitting) is formed in a cylindrical body with a bottom.

The bottom plate 6 is formed by bending the peripheral portion 6a into a hook shape and bulging outward in an inverted trapezoidal shape while leaving a ring-shaped groove portion 7 between the central portion and the peripheral portion 6a. Have been.

The flat bulging portion bottom surface 6b of the bottom plate 6 has a flat circular solid brazing material fitting groove 12 which is cylindrically recessed by a predetermined depth toward the inner container 1A as shown in the figure.
Are formed. In the bottom 12a of the solid brazing material fitting groove 12, the diameter is gradually reduced at a predetermined inclination angle from the peripheral end to the lower exhaust port forming flat portion 12c in the inverted state of the container shown in FIG. A funnel portion 12b having a downward tapered surface is formed. Then, a small-diameter exhaust port forming flat portion 12 which is a bottom portion thereof is formed.
A small-diameter exhaust port 10 similar to that described above is formed in the center of c. The diameter of the upper end of the funnel part 12b is smaller than the inner diameter of the bottom part 12a of the solid brazing material fitting groove 12. The exhaust port 10 communicates with the space 3 between the inner container 1A and the outer container 1B of the vacuum heat insulating container 1.

As shown in FIGS. 7 and 8, for example, the solid brazing material fitting groove 12 of the metal vacuum preserving vessel 1 before vacuum sealing is formed between both ends thereof (diameter line portion). )
4, a cylindrical solid brazing material (ingot-shaped brazing material) for vacuum sealing as shown in FIG.
11 is fitted and installed.

Then, as described above, the solid brazing material 11
Is further transferred into a vacuum furnace, and is first degassed through an exhaust port 10 at a predetermined temperature lower than the melting point of the solid brazing material 11 (baking step). Thereafter, the solid brazing material 11 is further heated at a temperature higher than the melting point thereof (sealing step). As a result, the cylindrical solid brazing material 11 melts and flows downward,
Guided by the tapered surface of the funnel portion 12b, it reaches and stops at the exhaust port 10 formed at the center of the flat portion 12c, so that the exhaust port 10 is securely filled and sealed as shown in FIG.

That is, in the exhaust structure of the metal vacuum heat insulating container of the present embodiment, the cylindrical solid brazing material 11 capable of securely fitting and fixing the solid brazing material 11 to the bulging portion bottom surface 6b at the center of the bottom plate 6 is provided. And a funnel portion 12b having a tapered surface descending from the bottom portion 12a of the solid brazing material fitting groove 12 so as to gradually reduce the diameter, and a flat portion 12c at the bottom of the funnel portion 12b. An exhaust port 10 is formed at the center, and the molten brazing material 11 is reliably guided to the exhaust port 10 by the tapered surface of the funnel 12b during heating in the sealing step. Therefore, the cylindrical solid brazing material 11 as shown in FIG. 4 is simply fitted and fixed in the cylindrical solid brazing material fitting groove 12 having a predetermined depth, so that the solid brazing material 11 does not fall off even when the carrier frame swings. And surely,
For example, a vacuum sealing method using a low melting point brazing material such as a glass sealing material can be adopted.

As a result, the vacuum sealing operation can be performed at a lower temperature as compared with the conventional vacuum brazing method, the degree of decrease in the tensile strength of the container base material is small, and the container base material is reduced as much as possible. Can be reduced in thickness, and the weight and cost of the product can be reduced.

Moreover, since the brazing material is a solid in the shape of a columnar body, and is securely fitted and fixed in the solid brazing material fitting groove 12 before melting, it is assumed that the carrier frame shakes during the transfer. Also, there is no danger of falling as in the prior art, and the holding state is ensured. Therefore, the product yield is high.

Third Embodiment FIGS. 10 to 12 show a vacuum sealing structure of a metal vacuum heat insulating container according to a third embodiment of the present invention.

Also in this embodiment, the target vacuum insulated container 1 itself is formed by joining an inner container 1A made of metal such as stainless steel and an outer container 1B to each other at the mouth 2 side as shown in FIGS. In this case, a heat insulating structure capable of keeping the inside of the inner container 1A under vacuum is realized by vacuum-sealing the gap 3 formed therebetween.

The inner container 1A has a bottomed bottle shape as shown in the figure, and is supported by the outer container 1B at the mouth 2 side. The outer container 1B is formed in a bottomed cylindrical body in which the bottom plate 6 is integrally fitted (inwardly fitted) to the inside of the opening edge 5 on the side of the bottom 4 whose diameter is reduced by a predetermined dimension.

The bottom plate 6 is formed by bending a peripheral portion 6a into a hook shape and bulging outward in an inverted trapezoidal shape after leaving a ring-shaped groove portion 7 between the central portion and the peripheral portion 6a. Is formed.

On the other hand, as shown in FIGS. 10 to 12, the flat bottom surface 6b of the bottom plate 6 has an elongated hole having a large diameter at the middle portion recessed by a predetermined depth toward the inner container 1A. The solid brazing material fitting groove 13 is formed. At the bottom of the solid brazing material fitting groove 13, a funnel portion 13a having a hemispherical cross section having a tapered surface (R surface) that gradually descends at a predetermined inclined curvature in the inverted state of the container as in FIGS. It is formed at the center part in the left-right direction, and has the same funnel part 13a.
A small-diameter exhaust port 10 similar to the above-described case is formed at the center of the bottom. The exhaust port 10 communicates with the space 3 between the inner container 1A and the outer container 1B.

The solid brazing material fitting groove 13 of the metal vacuum insulated container 1 thus constructed before the vacuum sealing is positioned in the longitudinal direction thereof, for example, as shown in FIGS. A cylindrical solid brazing material 11 for vacuum sealing as shown in FIG.

Then, as described above, the solid brazing material 11
The metal vacuum insulated container 1 fitted with the is further transferred into a vacuum furnace and first degassed at a predetermined temperature lower than the melting point of the solid brazing material 11 (baking step). It is heated at a temperature higher than the melting point of the brazing material 11 (sealing step). As a result, the solid brazing material 11 melts and flows downward, and is guided from the left and right bottom surfaces 14a and 14b of the solid brazing material fitting groove 13 and further guided by the tapered surface (R surface) of the funnel portion 13a. 1 and stops at an exhaust port 10 formed at the center of the bottom of the funnel 13a.
As shown in 2, the exhaust port 10 is reliably filled and sealed.

Therefore, in the structure of the present embodiment, the solid brazing material 11 having a columnar shape is easily fitted into the elongated solid brazing material fitting groove 13 having a predetermined length and depth as in the above embodiment. In addition, it is possible to reliably adopt the vacuum sealing method using the low melting point brazing material.

As a result, the vacuum sealing operation can be performed at a lower temperature as compared with the conventional vacuum brazing method, the degree of decrease in the tensile strength of the container base material is small, and the container base material is reduced as much as possible. Can be reduced in thickness, and the weight and cost of the product can be reduced.

Moreover, since the brazing material is a solid in the shape of a columnar body, and is securely fitted in the solid brazing material fitting groove 13 having a long hole shape before being melted, the carrier frame is temporarily supposed to be moved during the transfer. There is no danger of falling even if it shakes, and the holding state is ensured. As a result, the product yield is also improved.

Fourth Embodiment Next, FIGS. 13 to 15 show a vacuum sealing structure of a metal vacuum heat insulating container according to a fourth embodiment of the present invention.

In the structure of this embodiment, the solid brazing material fitting groove 1 which extends equally long on both the left and right sides at the mouth surface of the funnel portion 13a of the solid brazing material fitting groove 13 in the structure of the third embodiment.
The bottom surfaces 14a, 14b of 3 are not flat structures as described above, but are formed, for example, as round surfaces gradually descending to the funnel portion 13a side where the exhaust port 10 is formed as shown in FIGS. It is characterized by the following.

In this case, basically, the third embodiment is used.
It is apparent from the fact that the same effect as that of the solid brazing material can be obtained.
3, the exhaust port 10 is completely filled without remaining on the bottom surfaces 14a, 14b, and the filling efficiency is further improved.

(Embodiment 5) As shown in FIGS. 16 to 18, the vacuum sealing structure of the vacuum heat insulating container of the present embodiment differs from the structure of Embodiment 4 in that the solid brazing material fitting groove 13 has a central portion. The stepped surface A in the width direction of the upper opening edge portion of the funnel portion 13a is eliminated to form a continuous upper and lower surface so that the brazing material does not remain on the same stepped surface. The same functions and effects as those of the fourth embodiment can be more effectively realized.

Embodiment 6 The structure of Embodiment 4 is, for example, Embodiment 6 shown in FIG.
It can be modified as shown in FIGS.

That is, in the vacuum sealing structure of the vacuum heat insulating container of the present embodiment, the length in the left-right direction of the solid brazing material fitting groove 13 sandwiching the funnel portion 13a in the above-described fourth embodiment is not uniform. The right side is longer. Of course, this may be made longer on the left side.

(Embodiment 7) Further, the structure of the solid brazing material fitting groove 13 in the structure of Embodiment 4 may be changed to a cross shape as shown in FIGS. Can also.

With this configuration, the solid brazing material 11 may be fitted in any of the left, right, front and rear longitudinal directions, and the fitting work of the solid brazing material according to the container locking state with respect to the carrier frame is possible. And the work becomes easier.

In each of the first to seventh embodiments, the solid brazing material 11 is not limited to a long cylindrical body as shown in FIG. 4, but may be a rectangular block as shown in FIG. And a circular block as shown in FIG. 25 can also be used arbitrarily.

Eighth Embodiment FIGS. 26 to 28 show a vacuum sealing structure of a metal vacuum heat insulating container according to an eighth embodiment of the present invention.

Also in this embodiment, the target vacuum insulated container 1 itself is formed by joining an inner container 1A made of metal such as stainless steel and an outer container 1B to each other at the mouth 2 side as shown in FIGS. In this case, a heat insulating structure capable of keeping the inside of the inner container 1A under vacuum is realized by vacuum-sealing the gap 3 formed therebetween.

The inner container 1A has a bottomed bottle shape as shown in the figure, and is supported by the outer container 1B at the mouth 2 side. The outer container 1B is formed in a bottomed cylindrical body in which the bottom plate 6 is integrally fitted (inwardly fitted) to the inside of the opening edge 5 on the side of the bottom 4 whose diameter is reduced by a predetermined dimension.

The bottom plate 6 is formed by bending its peripheral edge 6a into a hook shape and bulging outward in an inverted trapezoidal shape after leaving a ring-shaped groove 7 between its central portion and the peripheral edge 6a. Is formed.

On the other hand, as shown in FIGS. 26 and 27, the inner container 1A is provided on the flat bottom surface 6b of the bottom plate 6 as shown in FIG.
A cylindrical solid brazing material fitting groove 15 recessed by a predetermined depth is formed on the side. The bottom portion 15a of the solid brazing material fitting groove 15 has a funnel portion 15b having a tapered surface that gradually descends at a predetermined inclination angle in a container inverted state similar to FIGS. Is formed,
A small-diameter exhaust port 10 similar to that described above is formed in the center of the bottom portion 15c of the funnel portion 15b. The exhaust port 10 communicates with the space 3 between the inner container 1A and the outer container 1B.

The above-mentioned solid brazing material fitting groove 15 of the metal vacuum insulated container 1 before vacuum sealing having the above-described structure is provided with, for example, a donut shape for vacuum sealing as shown in FIG. The solid brazing material 11 is fitted and installed.

Then, as described above, the solid brazing material 11
The metal vacuum insulated container 1 fitted with the is further transferred into a vacuum furnace and first degassed at a predetermined temperature lower than the melting point of the solid brazing material 11 (baking step). It is heated at a temperature higher than the melting point of the brazing material 11 (sealing step). As a result, the solid brazing material 11 melts and flows downward, and is guided from the bottom 15a surface of the solid brazing material fitting groove 15 by the tapered surface of the funnel portion 15b to the center of the bottom portion 15c of the funnel portion 15b. Then, the gas reaches the exhaust port 10 formed therein and stops, and the exhaust port 10 is reliably filled and sealed.

That is, in the exhaust structure of the metal vacuum heat insulating container of the present embodiment, the solid brazing material capable of securely fitting and fixing the donut-shaped solid brazing material 11 to the bulging portion bottom surface 6b at the center of the bottom plate 6. Fitting groove 15 and solid brazing material fitting groove 1
5 and a funnel portion 15b having a tapered surface descending from the bottom portion 15a so as to gradually reduce the diameter.
An exhaust port 10 is formed in the center of the bottom part 15c of the funnel part 15b,
At the time of heating in the sealing step, the molten brazing material 11 is reliably guided to the exhaust port 10 by the tapered surface of the funnel portion 15b. Therefore, the donut-shaped solid brazing material 1 as shown in FIG.
It is possible to easily and surely adopt a vacuum sealing method using a low melting point brazing material simply by fitting and fixing 1.

As a result, the vacuum sealing operation can be performed at a lower temperature as compared with the conventional vacuum brazing method, the degree of decrease in the tensile strength of the container base material is small, and the container base material is reduced as much as possible. Can be reduced in thickness, and the weight and cost of the product can be reduced.

Moreover, since the brazing material is a donut-shaped solid material and is securely fitted and fixed in the solid brazing material fitting groove 15 before melting, even if the carrier frame shakes during the transfer, There is no danger of falling as in the conventional case, and the holding state is ensured. Therefore, the product yield is high.

(Embodiment 9) The solid brazing material fitting groove 1 in the configuration of Embodiment 8 described above
The structure of the funnel 5 and the funnel portion 15b can be modified as shown in FIG.

That is, in the configuration of FIG. 29, the diameter of the bottom portion 16a of the solid brazing material fitting groove 16 is considerably smaller than that of the eighth embodiment, and the peripheral wall portion 16 of the solid brazing material fitting groove 16 is formed.
d is formed on the funnel portion 16b side as a completely tapered surface that descends while reducing the diameter.

Therefore, according to this configuration, the degree of flow of the molten brazing material 11 to the exhaust port 10 side during the heating is further improved. Reference numeral 16c indicates the bottom of the funnel 16b.

(Embodiment 10) FIGS. 30 to 32 show a vacuum sealing structure of a metal vacuum heat insulating container according to Embodiment 10 of the present invention.

Also in this embodiment, the structure of the vacuum insulated container 1 itself is basically the same as that of FIGS. 1 and 6 described above. For example, the inner container 1A made of metal such as stainless steel and the outer container 1 are used.
B are joined to each other on the side of the mouth 2 to form a double structure, and the gap 3 formed therebetween is vacuum-sealed to realize a heat-insulating structure capable of keeping a vacuum inside the inner container 1A. It has become.

The inner container 1A has a bottomed bottle shape and is supported by the outer container 1B on the mouth 2 side. The outer container 1B is formed in a bottomed cylindrical body in which the bottom plate 6 is integrally fitted (inwardly fitted) to the inside of the opening edge 5 on the side of the bottom 4 whose diameter is reduced by a predetermined dimension.

The bottom plate 6 is formed by bending the peripheral edge 6a into a hook shape and bulging outward in an inverted trapezoidal shape while leaving a ring-shaped groove 7 between the central portion and the peripheral edge 6a. (See FIGS. 1 and 6).

On the other hand, as shown in FIGS. 30 and 31, an inner container 1A is provided on the flat bottom surface 6b of the bottom plate 6 as shown in FIG.
A substantially cylindrical solid brazing material fitting groove 17 recessed by a predetermined depth is formed on the side. The solid brazing material fitting groove 1
7 is a funnel part 17 having a tapered surface which descends downward from the periphery of the opening at a predetermined inclination angle so as to gradually decrease in diameter in the inverted state of the container similar to FIG.
and a different-diameter cylindrical portion 18 formed below the funnel portion 17a. An exhaust port 10 similar to that of the above embodiment is formed at the center of the small-diameter portion-side bottom 19 of the different-diameter cylindrical portion 18. I have. Further, four sets of exhaust grooves 17, b17b,... Are provided on the outer periphery of the funnel portion of the solid brazing material fitting groove 17 at intervals of, for example, 90 degrees.
Are formed to bulge outward in the radial direction, and the exhaust grooves 17, b1 are formed.
The exhaust port 10 can be communicated with the external space above the funnel 17a even when the solid brazing material 11 having a columnar shape is fitted into the solid brazing material fitting groove 17 through 7b. ing. The exhaust port 10 communicates with the space 3 between the inner container 1A and the outer container 1B.

Then, the solid brazing material fitting groove 17 of the metal vacuum insulated container 1 before vacuum sealing configured as described above is
For example, as shown in FIG. 31, a relatively large-diameter cylindrical solid brazing material 11 for vacuum sealing as shown in FIG. Fitted and fixed.

Then, as described above, the solid brazing material 11
The metal vacuum insulated container 1 into which is fitted is further transferred into a vacuum furnace, and firstly, as shown by an arrow in FIG.
After being deaerated (baking step) at a predetermined temperature lower than the melting point of the solid brazing material 11 by using 7, b17b,..., The solid brazing material 11 is further heated at a temperature higher than the melting point of the solid brazing material 11 (sealing). Stop process). As a result, the solid brazing material 11 melts and flows downward, and reaches the exhaust port 10 formed at the center of the small-diameter portion-side bottom portion of the different-diameter cylindrical portion 18 while being guided by the tapered surface of the funnel portion 17a. As a result, the exhaust port 10 is reliably filled and sealed.

Accordingly, even with this configuration, the low-melting brazing material can be easily and reliably formed simply by fitting the solid brazing material 11 having a columnar shape as shown in FIG. Can employ a vacuum sealing method.

As a result, the vacuum sealing operation can be performed at a lower temperature as compared with the conventional vacuum brazing method, and the degree of decrease in the tensile strength of the container base material is small. Can be reduced in thickness, and the weight and cost of the product can be reduced.

Further, since the brazing material is a solid in the shape of a columnar body and is securely fitted and fixed in the solid brazing material fitting groove 17 before being melted, the carrier frame temporarily shakes during the transfer. There is no danger of falling and the holding state is ensured. Therefore, the yield of products is also increased.

The above-described exhaust groove 17b in this configuration
It is needless to say that three sets may be arranged at intervals of 120 degrees from each other.

(Embodiment 11) FIG. 33 shows a vacuum sealing structure of a metal vacuum insulation container according to Embodiment 11 of the present invention.

Also in the present embodiment, the target vacuum insulated container 1 itself has a double structure in which an inner container 1A made of metal such as stainless steel and an outer container 1B are joined to each other at the mouth side as shown in the figure. By vacuum-sealing the gaps 3 formed therebetween, a heat-insulating structure capable of keeping a vacuum inside the inner container 1A is realized.

The inner container 1A has a bottomed bottle shape and is supported by the outer container 1B on the mouth side. Further, the outer container 1B is formed as a bottomed cylindrical body in which a flat bottom plate 6 as a whole is integrally fitted (inwardly fitted) to the inside of the opening edge 5 on the bottom 4 side.

On the other hand, approximately at the center of the bottom plate 6, FIG.
As shown in FIG.
Is provided. The funnel-shaped copper cup member 20 is fitted into the cup member fitting hole 39. The copper cup member 20 is connected to the cup member fitting hole 39.
The silver solder 21, 2
1. Joining edge 20c joined by high frequency heating
A funnel portion 20a having a slidable cross section having a tapered surface that gradually descends at a predetermined inclination angle in the illustrated container inverted state,
The air outlet 10 is formed at the center of the bottom portion 20b of the funnel portion 20a and the same exhaust port 10 as in each case described above. And
The exhaust port 10 communicates with the space 3 between the inner container 1A and the outer container 1B when the copper cup member 20 is fitted and fixed to the bottom plate 6.

The copper cup member 20 of the metal vacuum insulated container 1 thus constructed before vacuum sealing corresponds to the solid brazing material fitting groove of each embodiment described above. As shown in FIG. 4, a cylindrical solid brazing material for vacuum sealing as shown in FIG. 4 (in this case, for example, formed of an Al-based metal brazing material) 11 is inserted and fitted as shown.

Then, as described above, the solid brazing material 11
Is further transferred into a vacuum furnace, and is first degassed (baked) at a predetermined temperature lower than the melting point of the solid brazing material 11, and then further solidified. Heated at a temperature higher than the melting point of material 11
(Sealing step). As a result, the solid brazing material 11 melts and flows downward, and is guided by the tapered surface of the funnel portion 20a of the copper cup member 20, and reaches the exhaust port 10 formed at the center of the bottom 20b of the funnel portion 20a. As a result, the exhaust port 10 is reliably filled and sealed.

That is, in the exhaust structure of the metal vacuum insulation container of the present embodiment, the cup member fitting hole 39 at the center of the bottom plate 6 is provided.
Then, a copper cup member 20 having a funnel portion 20a having a tapered surface descending so as to gradually reduce the diameter is fitted and fixed, and an exhaust port is provided at the center of a bottom portion 20b where the tapered surface of the peripheral wall of the funnel portion 20a descends and merges. 10 is formed, and for example, the metal-based molten brazing material 11 is reliably guided to the exhaust port 10 by the tapered surface of the peripheral wall of the funnel portion 20a. Therefore, only by fitting the solid brazing material 11 having a columnar shape into the solid brazing material fitting groove having a predetermined depth which is a tapered surface inside the copper cup member 20, the vacuum using the low melting point brazing material can be easily and reliably achieved. Adoption of a sealing method can be enabled.

As a result, compared with the conventional vacuum brazing method, the vacuum sealing operation can be performed at a lower temperature, the degree of decrease in the tensile strength of the container base material is small, and the container base material is reduced as much as possible. Can be reduced in thickness, and the weight and cost of the product can be reduced.

Moreover, since the brazing material is a solid in the shape of a columnar body and is securely fitted in the solid brazing material fitting groove of the copper cup member 20 before being melted, the carrier frame is temporarily moved during the transfer. There is no danger of falling even if it shakes, and the holding state is ensured.

Further, the exhaust port 10 is formed at the bottom 20b of the copper cup member 20 as described above.
Since the exhaust port is formed of a brazing material 11 of a metal type such as i, Sn or the like and a copper material having good wettability, the bonding strength of the sealing portion is improved without being affected by the passive film of stainless steel. Reliability is improved.

(Embodiment 12) Next, FIG. 34 shows a vacuum sealing structure of a metal vacuum insulation container according to Embodiment 12 of the present invention.

In the structure of this embodiment, the solid brazing material fitting groove 22 is used when the donut-shaped solid brazing material 11 is used similarly to the solid brazing material fitting groove 15 in the structure of the eighth embodiment. The exhaust port 10 is formed as a flat structure without forming a funnel section at the bottom of the exhaust port. The inside diameter of the solid brazing material fitting groove 22 is slightly smaller than the outside diameter of the donut-shaped solid brazing material 11 to be used so that press-fitting is possible. Therefore, it is very difficult to fall off. Also, the hole in the center of the donut-shaped solid brazing material 11 is made coaxial with the exhaust port 10, and the hole diameter is equal to or slightly larger than the diameter of the exhaust port 10. Try to improve. Reference numeral 23 denotes a getter, and 24 denotes a getter supporting member.

The getter 23 is supported and fixed by spot welding the getter support member 24 to the inside of the bottom plate 6 via a pin member.
Is performed simultaneously with the press-fitting operation of the solid brazing material 11. Therefore, the number of secondary processing personnel on the production line can be reduced.

With such a configuration, basically the same functions and effects as those of the eighth embodiment can be obtained.

(Thirteenth Embodiment) FIGS. 35 and 36 show a vacuum sealing structure of a metal vacuum heat insulating container according to a thirteenth embodiment of the present invention.

Also in the present embodiment, the target vacuum insulation container 1 itself has the same structure as the case of FIG. 33, for example, but differs in the structure of the solid brazing material fitting groove in the bottom plate 6.

That is, in the vacuum sealing structure of the metal vacuum heat insulating container of the present embodiment, the solid brazing material 1 having a columnar shape as shown in FIG.
A solid brazing material fitting groove 25 formed of a funnel part 25a having a slightly larger diameter of the bottom part 25b and having a mortar shape in cross section, which can be securely fitted and fixed in the standing state, is formed. The inner peripheral surface of the funnel portion 25a of the solid brazing material fitting groove 25 is a tapered surface that descends from the upper end so as to gradually reduce the diameter, and has a relatively large diameter at the bottom 25b of the funnel portion 25a. An exhaust port 10 is formed at the center of the flat surface. In addition, a brazing material support fitting 26 is provided above the solid brazing material fitting groove 25.
Are installed in a cross state, and the support fitting 26 has an exhaust port 1
The solid brazing material insertion hole 27 is formed slightly laterally from the position corresponding to 0. Then, the solid brazing material 11 is inserted into the solid brazing material insertion hole 27 of the support fitting 26 as shown in FIG.
Is inserted from above, and the exhaust port 10 at the bottom 25b of the funnel 25a is inserted.
It is supported upright on the side. Then, at the time of heating in the sealing step, the molten brazing material 11 is reliably guided to the exhaust port 10 by the tapered surface of the inner periphery of the funnel portion 25a. Therefore, even in this configuration, the solid brazing material 11 having a columnar shape as shown in FIG. 4 is inserted into the solid brazing material fitting groove 25 having a tapered surface and having a predetermined depth through the solid brazing material insertion hole 27 of the supporting bracket 26. It is possible to easily and surely adopt the vacuum sealing method using the low melting point brazing material simply by fitting.

As a result, the vacuum sealing operation can be performed at a lower temperature than in the case of the conventional vacuum brazing method, and the degree of decrease in the tensile strength of the container base material is small. Can be reduced in thickness, and the weight and cost of the product can be reduced.

Moreover, the brazing material is a solid in the shape of a columnar body, and is securely fitted and supported in the solid brazing material fitting groove 25 via the support metal fittings 26 in a stable and upright state in particular before being melted. Therefore, even if the carrier frame shakes during the transfer, there is no possibility that the carrier frame will fall as in the related art, and the holding state is further ensured. Therefore, the product yield is further increased.

Further, since there is no need to use a binder, workability is good.

Embodiment 14 FIG. 37 shows a vacuum sealing structure of a metal vacuum heat insulating container according to Embodiment 14 of the present invention.

Also in this embodiment, the target vacuum insulation container 1 itself employs, for example, a flat bottom plate 6 similar to that shown in FIG.

Then, in the center of the bottom plate 6, the thirteenth embodiment
A solid brazing material fitting groove 28 having the same structure as that of FIG.

In the structure of this embodiment, a bridge-shaped lid cover 29 is attached by spot welding at both left and right ends as shown in the drawing, instead of the support fitting 26 as in the structure of the thirteenth embodiment. The solid brazing material 11 fitted in the solid brazing material fitting groove 28 is prevented from falling off. The solid brazing material 11 is fitted in the solid brazing material fitting groove 28 in a bridging state in a horizontal state as shown in the figure, and the lid cover 29 is attached to the solid brazing material 1 in the bridging state.
1 is attached along the state.

According to such a configuration, it is possible to more reliably prevent the solid brazing material 11 from falling off when the carrier frame swings, and the yield of the product is further improved.

Reference numeral 28a denotes a funnel portion of the solid brazing material fitting groove 28, 28b denotes a bottom portion thereof, and 10 denotes an exhaust port formed in the bottom portion 28b. It is exactly the same as in the case.

Fifteenth Embodiment FIGS. 38 to 40 show a vacuum sealing structure of a metal vacuum heat insulating container according to a fifteenth embodiment of the present invention.

Also in this embodiment, the target vacuum insulation container 1 itself employs, for example, a flat bottom plate 6 similar to that shown in FIG.

The structure of the vacuum sealing portion of this embodiment is almost the same as that of the fourteenth embodiment, except that the solid brazing material 11 Are provided so that the solid brazing material 11 is held by the claw members 31a, 31a.

Therefore, in this configuration, the above-described first to first embodiments are used.
4, the solid brazing material 11 is more reliably held, and dropping due to the swing of the carrier frame does not occur first. Therefore, the product yield is greatly improved.

Reference numeral 30 denotes a solid brazing material fitting groove,
a is a funnel part of the solid brazing material fitting groove 30, 30b is a bottom part thereof,
Reference numeral 10 denotes an exhaust port formed in the bottom portion 30b, and the configuration, operation and effect thereof are exactly the same as those of the thirteenth and fourteenth embodiments.

That is, as described above, the lid cover 31
The metal vacuum insulated container 1 in which the solid brazing material 11 is securely held is transferred into a vacuum furnace and first heated at a temperature higher than the melting point of the solid brazing material 11 (sealing step).
As a result, the solid brazing material 11 melts and the claw members 31
a, 31a, flows downward, and is guided by the tapered surface of the inner periphery of the funnel portion 30a.
After reaching the exhaust port 10 formed in the center, the exhaust port 10 stops, and as shown in FIG. 40, the exhaust port 10 is securely filled and sealed.

(Embodiment 16) FIG. 41 shows a vacuum sealing structure of a metal vacuum insulation container according to Embodiment 16 of the present invention. In this embodiment, as shown in the figure, the getter cover 3
In FIG. 28, the donut-shaped solid brazing material 11 is set as shown in FIG.
There is no need to set 1.

Also in this embodiment, the target vacuum insulated container 1 itself is the same as that described above, and the inner container (not shown) made of metal such as stainless steel and the outer container 1B are joined to each other at the mouth side. And a gap between them
By vacuum-sealing (not shown), a heat-insulating structure capable of maintaining a vacuum inside the inner container 1A is realized. Further, the outer container 1B is formed in a bottomed cylindrical body in which the peripheral edge of the bottom plate 6 is integrally fitted (inwardly fitted) to the inside of the bottom side opening edge as shown in the figure.

On the other hand, in the upright state of the container, a rib 33 having a trapezoidal cross section is formed substantially in the center of the bottom plate 6 as shown in FIG. Solid brazing material fitting groove 3 having the same function as
2 are formed. The solid brazing material fitting groove 32
A funnel portion 32a having a slidable cross section having a tapered surface that gradually descends at a predetermined inclination angle in the illustrated container erect state,
The air outlet 10 is formed at the center of the bottom portion 32b of the funnel portion 32a. And
The exhaust port 10 communicates with a space between the inner container and the outer container 1B when the bottom plate 6 is fitted and fixed to the outer container 1B.

On the other hand, a getter 35 is provided on the rib 33, and the upper part thereof is fixedly supported by being covered with a getter cover 36. The getter cover 36 is
One end thereof is fixed to the bottom plate 6 while being fixed, while the other end is extended from above the solid brazing material fitting groove 32 to the upper surface of the lateral rib 33 and joined and fixed to the rib surface.
The solid brazing material 11 is also covered simultaneously with the fixing of the solid brazing material 5.

As described above, before the bottom plate 6 is fitted to the outer container 1B, the solid brazing material fitting grooves 32 are already formed.
Vacuum insulation vessel 1 made of metal with solid brazing material 11 fitted inside
Is further transferred to a vacuum furnace in an erect state in the drawing, and is first degassed at a predetermined temperature lower than the melting point of the solid brazing material 11 (baking step), and then further defrosted to a temperature lower than the melting point of the solid brazing material 11. It is heated at a high temperature (sealing step).
As a result, the solid brazing material 11 melts and flows downward, and is guided by the tapered surface of the inner periphery of the funnel portion 32a of the solid brazing material fitting groove 32 and formed at the center of the bottom 32b of the funnel portion 32a. The exhaust port 10 is stopped and stopped, and the exhaust port 10 is reliably filled and sealed.

According to such a structure, the solid brazing material 11 can be completely prevented from falling off by the getter cover 36 at the same time when the getter 35 is fixed to the bottom plate 66, and the bottom plate 6 can be attached to the outer container 1B. Since it is performed before, there is no fear of falling off after the state in which the attachment of the bottom plate 6 is completed.

Further, according to this configuration, the vacuum evacuation step can be performed in an upright state of the container, which is convenient.

Further, the operation and effect of the configuration of the other portions are basically the same as those of the above-described embodiments.

(Embodiment 17) FIGS. 42 and 43 show a vacuum sealing structure of a metal vacuum heat insulating container according to Embodiment 17 of the present invention, in which an exhaust port has a long hole shape.

The shape of the exhaust port 10 in each of the above embodiments is, for example, a circular one. by the way,
When considering the ease of sealing, it is better for the exhaust port 10 to have a small hole diameter.
There is a problem that exhaust takes time. This embodiment is configured to solve the problem.

Also in this embodiment, the target vacuum insulation container 1 itself has, for example, the same structure as that shown in FIG. 33. For example, the flat bottom plate 6 is provided with the second embodiment.
A solid brazing material fitting groove 12 similar to the above is formed.

The solid brazing material fitting groove 12 is formed by recessing the flat bottom surface of the bottom plate 6 into the inner container 1A side by a predetermined depth at a predetermined depth as shown in FIG. And the bottom 12a is further inserted into the inner container 1A.
When the container is in an inverted state, the flat portion 1 for forming the lowermost exhaust port from the peripheral end in the inverted state of the container.
A funnel portion 12b having a tapered surface descending so as to gradually reduce the diameter at a predetermined inclination angle toward the portion 2c is formed. In the center of the small-diameter exhaust port forming flat portion 12c which is the bottom of the funnel portion 12b, as shown in FIG.
0 is formed. The diameter of the upper end of the funnel part 12b is
The solid brazing material fitting groove 12 is formed smaller than the inner diameter of the cylindrical portion bottom portion 12a. The exhaust port 10 is
It communicates with the inside of the space 3 between the inner container 1A and the outer container 1B of the vacuum heat insulating container 1.

The cylindrical portion of the solid brazing material fitting groove 12 of the metal vacuum preservation container 1 before vacuum sealing having the above-described structure has both ends thereof, for example, as in the case of FIG. 7 and FIG. while
4 (for example, a bar-shaped solid brazing material in a broad sense) or a solid brazing material (ingot-shaped brazing material) for vacuum sealing as shown in FIG. Are fitted and installed.

[0127] The solid brazing material 11
Is further transferred into a vacuum furnace, and is first degassed through an exhaust port 10 at a predetermined temperature lower than the melting point of the solid brazing material 11 (baking step). Thereafter, the solid brazing material 11 is further heated at a temperature higher than the melting point thereof (sealing step). As a result, the cylindrical solid brazing material 11 melts and flows downward,
Guided by the tapered surface of the funnel portion 12b, it reaches the elongate exhaust port 10 formed in the center of the exhaust port forming flat portion 12c and is stored therein, as shown in FIG. 42. Is reliably filled and sealed.

As described above, the larger the diameter of the exhaust port 10 is, the higher the exhaust efficiency is. However, if it is too large, the melted brazing material 11 falls off. Whether or not the brazing material 11 falls off is determined by the relationship between the diameter of the exhaust port 10 and the surface tension of the melted brazing material 11. Therefore, the diameter of the exhaust port 10 is originally limited by the surface tension of the brazing material 11 to be used at the time of melting, and in the case of a circular hole, there is almost no freedom to increase the diameter, and it is difficult to improve the exhaust efficiency. .

However, in this embodiment, as described above, the shape of the exhaust port 10 is a long hole, and
The surface tension of (1) is reduced by reducing its width, while the improvement of exhaust efficiency is addressed by increasing its length. Improvement can be realized together.

The brazing material 11 is not limited to a glass sealing material, for example, but may be a Ni brazing material or a paste-like material other than a solid brazing material.

(Embodiment 18) FIGS. 44 to 47 show a vacuum sealing structure of a metal vacuum heat insulating container according to Embodiment 18 of the present invention.

As in the case of the seventeenth embodiment, for example, FIG.
When the shape of the exhaust port 10 is a long hole as shown in FIGS. 4 and 45, the exhaust port 10 itself can be used for positioning and fixing the solid brazing material 11 as shown in FIGS. 46 and 47, for example. Thus, the molten brazing material 11 can be reliably filled in the exhaust port 10 portion.

That is, in the vacuum sealing structure of the metal vacuum sealing container according to the present embodiment, a cylindrical solid solder as shown in FIGS. 46 and 47 is provided at the center of the flat type bottom plate 6 similar to FIG. Bottom 4 to which material 11 can be fully fitted
A solid brazing material fitting groove 40 having a funnel portion 40a having a mortar-shaped cross section having a diameter 0b larger than the length of the solid brazing material 11 by a predetermined dimension is formed. The inner peripheral surface of the funnel portion 40a of the solid brazing material fitting groove 40 is a tapered surface that descends from the upper end so as to gradually reduce the diameter. Hole shaped exhaust port 1
0 is formed.

[0134] Corresponding to the elongated hole-shaped exhaust port 10, a column shorter than the length of the exhaust port 10 by a predetermined dimension or more and having a diameter larger than the width of the elongated hole-shaped exhaust port 10 by a considerable dimension or more. FIG. 46 and FIG.
As shown in (1), fitting and installation are performed with sufficient exhaust spaces 10a and 10b left at both ends.

The metal vacuum insulated vessel 1 in which the solid brazing material 11 is fitted and installed in the elongated hole-shaped exhaust port 10 as described above is further transferred into a vacuum furnace, and the solid brazing material is first Degassing is performed at a predetermined temperature lower than the melting point of the material 11 (baking step).
Efficient use of the two sets of exhaust spaces 10a and 10b at both ends is provided. Thereafter, the solid brazing material 11 is further heated at a temperature higher than the melting point of the solid brazing material 11 (sealing step). As a result, the solid brazing material 11 melts at the exhaust port 10 and flows downward as it is, thereby securely filling and sealing the exhaust port 10.

Therefore, in the configuration of the present embodiment, the solid brazing material 11 in the form of a column is inserted into the exhaust port 10 in the shape of a long hole that is longer than the length of the solid brazing material 11 in a rod shape and narrower in width than its diameter. The vacuum sealing method using a low-melting brazing material can be easily and reliably adopted simply by fitting in a horizontal state while leaving the exhaust spaces 10a and 10b in the space.

In addition, since the brazing material is a solid in the shape of a columnar body, it is securely fitted and positioned in the elongated exhaust port 10 which functions as a solid brazing material fitting groove before melting. Even if the carrier frame shakes during transfer, there is no danger that the carrier frame will fall, and the installation position will be secure. As a result, the product yield is also improved.

(Embodiment 19) FIG. 48 shows the vacuum sealing structure of a metal vacuum heat insulating container according to Embodiment 19 of the present invention.

According to the structure of this embodiment, for example,
Funnel part 4 of the solid brazing material fitting groove 40 having the same cross-sectional structure as that of FIG.
The bonding layer 4 having good wettability, which is determined by the relationship with the molten brazing material to be used, such as an oxide layer or a metal plating layer, over the entire inner surface of the metal layer 0a
1 is formed.

That is, a passive film, which is an oxide film, is formed on the surface of the bottom plate 6 which is generally made of stainless steel. Good nature. However, since the formation of an oxide film by natural oxidation does not always have a sufficient oxygen content, an oxide layer is more positively formed. Then, the bonding property with the glass sealing material is further improved. On the other hand, the passive film has poor wettability with the brazing metal. Therefore,
When the brazing material to be used is a metal brazing material, a bonding property is improved by forming a metal plating layer having good wettability correspondingly.

In this manner, even in the case of a low melting point brazing material of about 400 ° C. to 600 ° C., such as a glass sealing material and a low melting point brazing material, the molten brazing material has sufficient adhesive strength. It is joined to the exhaust port 10 part, and the joint sealing strength is increased.

The shape and structure of the solid brazing material fitting groove 40 in this configuration are not limited to those shown in the drawings, but may be any of the above-described embodiments. In addition, the exhaust port 10
Any shape such as a circular shape and a long hole shape can be adopted.

The formation of the oxide layer can be easily formed by, for example, baking the inner surface of the funnel portion 40a or wiping it with an acid. The metal plating layer is formed by, for example, a copper plating layer.

The solid brazing material 11 used in the above-mentioned various examples is, for example, a glass-based sealing material such as a lead borosilicate glass sealing material, or a metal-based sealing material such as an Al, Sn, Ni-based brazing material. Various low melting point brazing materials such as brazing materials can be adopted, and either one of the oxide layer and the metal plating layer is appropriately selected as described above corresponding to the brazing material of each series. .

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a metal vacuum insulation container according to Embodiment 1 of the present invention.

FIG. 2 is a plan view of the same bottom.

FIG. 3 is a cross-sectional view of an exhaust port portion of the main part.

FIG. 4 is a perspective view showing a shape of a solid brazing material (first example) used for vacuum sealing of an exhaust port in the embodiment.

FIG. 5 is a cross-sectional view of the exhaust port of FIG. 3 sealed using the solid brazing material of FIG. 4;

FIG. 6 is a cross-sectional view of a metal vacuum insulated container according to Embodiment 2 of the present invention.

FIG. 7 is a plan view of the same bottom.

FIG. 8 is a sectional view of an exhaust port portion of the main part.

9 is a cross-sectional view of the exhaust port of FIG. 8 sealed using the same solid brazing material as in FIG. 4;

FIG. 10 is a plan view of a bottom portion of a metal vacuum insulation container according to a third embodiment of the present invention.

FIG. 11 is a sectional view of an exhaust port portion of the essential part.

FIG. 12 is a cross-sectional view of the exhaust port of FIG. 8 sealed using the same solid brazing material as in FIG. 4;

FIG. 13 is a plan view of the bottom of a metal vacuum insulated container according to Embodiment 4 of the present invention.

FIG. 14 is a sectional view of an exhaust port portion of the essential part.

FIG. 15 is a cross-sectional view of the exhaust port of FIG. 14 sealed using the same solid brazing material as in FIG. 4;

FIG. 16 is a plan view of the bottom of a metal vacuum insulated container according to Embodiment 5 of the present invention.

FIG. 17 is a cross-sectional view of an exhaust port portion of the main part.

FIG. 18 is a cross-sectional view of the exhaust port of FIG. 17 sealed with the same solid brazing material as in FIG. 4;

FIG. 19 is a plan view of the bottom of a metal vacuum insulated container according to Embodiment 6 of the present invention.

FIG. 20 is a sectional view of an exhaust port portion of the main part.

FIG. 21 is a cross-sectional view of the exhaust port of FIG. 20 sealed using the same solid brazing material as in FIG. 4;

FIG. 22 is a plan view of a main part of a metal vacuum insulated container according to a seventh embodiment of the present invention.

FIG. 23 is a sectional view of an exhaust port portion of the essential part.

FIG. 24 is a perspective view showing a second example of the shape of the solid brazing material that can be employed for vacuum sealing of the exhaust port in Examples 1 to 7.

FIG. 25 is a perspective view showing a third example of the shape of the solid brazing material that can be employed for vacuum sealing of the exhaust port in the first to seventh embodiments.

FIG. 26 is a plan view of a bottom portion of a metal vacuum insulation container according to Embodiment 8 of the present invention.

FIG. 27 is a sectional view of the exhaust port at the bottom.

FIG. 28 is a perspective view showing a shape of a solid brazing material used for vacuum sealing of an exhaust port in the embodiment.

FIG. 29 is a cross-sectional view of an exhaust port at the bottom of a metal vacuum insulated container according to Embodiment 9 of the present invention.

FIG. 30 is a plan view of the bottom of a metal vacuum insulated container according to Embodiment 10 of the present invention.

FIG. 31 is a sectional view of the exhaust port.

FIG. 32 is a perspective view showing a shape of a solid brazing material used for vacuum sealing of an exhaust port in the embodiment.

FIG. 33 is a cross-sectional view of the bottom of a metal vacuum insulated container according to Embodiment 11 of the present invention.

FIG. 34 is a cross-sectional view of the bottom of a metal vacuum insulated container according to Embodiment 12 of the present invention.

FIG. 35 is a cross-sectional view of the bottom of a metal vacuum insulated container according to Embodiment 13 of the present invention.

FIG. 36 is a perspective view of an exhaust port at the bottom.

FIG. 37 is a cross-sectional view of a bottom portion of a metal vacuum insulated container according to Embodiment 14 of the present invention.

FIG. 38 is a cross-sectional view of a bottom portion of a metal vacuum insulated container according to Embodiment 15 of the present invention.

FIG. 39 is a perspective view of the essential part.

FIG. 40 is a cross-sectional view of the relevant part at the time of filling the brazing filler metal.

FIG. 41 is a cross-sectional view of a bottom portion of a metal vacuum insulated container according to Embodiment 16 of the present invention.

FIG. 42 is a cross-sectional view of an exhaust port at the bottom of a metal vacuum insulated container according to Example 17 of the present invention.

FIG. 43 is a plan view of an essential part of the exhaust port.

FIG. 44 is a cross-sectional view of an exhaust port at the bottom of a metal vacuum insulated container according to Embodiment 18 of the present invention.

FIG. 45 is a plan view of a main part of the exhaust port.

FIG. 46 is an enlarged cross-sectional view of a state where a solid brazing material is fitted and installed in the exhaust port of FIG. 45;

FIG. 47 is a plan view of an exhaust port in a solid brazing material fitting installation state similar to FIG. 46;

FIG. 48 is a cross-sectional view of an exhaust port at the bottom of a metal vacuum insulated container according to Example 19 of the present invention.

FIG. 49 is a sectional view showing an exhaust structure of a metal vacuum heat insulating container according to a first conventional example.

FIG. 50 is a sectional view showing an exhaust structure of a metal vacuum heat insulating container according to a second conventional example.

FIG. 51 is a cross-sectional view showing an exhaust structure of a metal vacuum heat insulating container according to a third conventional example.

FIG. 52 is a plan view of the exhaust port.

FIG. 53 is a cross-sectional view of the exhaust port.

FIG. 54 is a cross-sectional view showing an exhaust structure of a metal vacuum insulated container according to a fourth conventional example.

FIG. 55 is a plan view showing a configuration of an exhaust port at the bottom of the metal vacuum heat insulating container.

FIG. 56 is a sectional view of the exhaust port.

FIG. 57 is a cross-sectional view showing an exhaust structure of a metal vacuum heat insulating container according to a fifth conventional example.

FIG. 58 is a plan view showing a configuration of an exhaust port at the bottom of the metal vacuum insulation container.

FIG. 59 is a cross-sectional view of the exhaust port.

[Explanation of symbols]

1 is a vacuum container made of metal, 2 is a mouth, 3 is a gap, 4 is a bottom, 6 is a bottom plate, 6b is a bottom, 7 is a groove, 8, 12, 13, 1
5, 16, 17, 22, 25, 28, 30, and 32 are solid brazing material fitting grooves, 10 is an exhaust port, and 11 is a solid brazing material.

Claims (3)

(57) [Claims] 1. A metal vacuum container in which a metal inner container and an outer container are formed in a double structure with a gap therebetween through a gap, wherein a solid sealing material is employed, and a predetermined position on the bottom of the outer container is provided. A solid sealing material fitting recess for fitting the solid sealing material is formed, and the solid sealing material is fitted to the solid sealing material fitting recess, and the solid sealing material fitted with the solid sealing material is formed. A vacuum sealing structure for a metal vacuum heat insulating container, characterized in that another recess having a predetermined depth is further provided at the bottom of the sealing material fitting recess, and an exhaust port is formed at the bottom of the other recess. 2. The solid sealing material comprises a rod-shaped solid sealing material, and the solid sealing material fitting recess has a long groove portion having a length corresponding to the length of the rod-shaped solid sealing material. 2. The vacuum sealing structure for a metal vacuum insulation container according to claim 1, wherein: 3. The solid sealing material has a circular shape, and the solid sealing material fitting recess has a circular groove having an inner diameter corresponding to the outer diameter of the circular solid sealing material. The vacuum sealing structure for a metal vacuum heat insulating container according to claim 1, wherein: