JP2737095B2 - Vacuum sealing structure of metal vacuum double 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 double container used as an inner bottle such as a stainless steel bottle.

[0002]

2. Description of the Related Art As a metal vacuum double container used as an inner bottle such as a stainless steel bottle, for example, a vacuum double container obtained by vacuum-sealing a space between inner and outer metal containers is generally well known. ing.

The general structure of the above-mentioned vacuum sealing is shown in FIG.
As shown in FIG. 8, the inner container 1A made of metal (for example, stainless steel) and the outer container 1B are joined to each other on the mouth portion 2 side to form a double container 1, and a space formed between the two. There is a structure in which the exhaust port 12 is sealed with a sealing plate 30 via a brazing material (for example, a metal brazing material) after evacuating the vacuum pump 3 (see, for example, JP-A-3-267623).

[0004]

However, when the above-described conventional vacuum sealing structure is employed, the exhaust port 12 can be enlarged, but a sealing plate 30 for sealing the exhaust port 12 is required. Therefore, in addition to the difficulty in positioning the sealing plate 30 with respect to the exhaust port 12 and uniformly disposing the brazing material at the edge of the exhaust port 12, the brazing filler metal has a large diameter and a large welding area. Therefore, it becomes difficult to secure the welding accuracy due to the above-mentioned problems, and there is also a problem in the reliability of the sealing accuracy.

[0005] Further, since a metal brazing material that melts at a high temperature is used as the brazing material, there is also a drawback that it is necessary to raise the temperature of the vacuum exhaust chamber.

In view of the above problems, the use of a glass solid sealing material that melts at a low temperature has been studied in recent years. In this case, as shown in FIG.
A storage recess 9 having a small-diameter exhaust port 12 is formed at the bottom of the container, a rod-shaped glass sealing material 10 is housed and arranged in the storage recess 9, and the glass sealing material 10 is evacuated in a vacuum exhaust chamber. The exhaust port 12 formed in the storage recess 9 by melting is sealed with molten glass.

However, when the sealing structure as described above is used, the double container 1 is placed in a state where the glass sealing material 10 is placed and housed in the storage recess 9 formed at the bottom of the inverted double container 1. It is mounted on a carrier frame and transferred to an evacuation chamber, and vacuum sealing is performed while moving in the evacuation chamber. At this time, the glass sealing material 10 is moved into the storage recess 9 while the carrier frame is moving. , It may be impossible to perform vacuum sealing.

The present invention has been made in view of the above points, and has as its object to prevent the sealing material from falling off when a low-melting glass sealing material is used.

[0009]

The basic structure of the present invention is as follows.
In a metal vacuum double container comprising a metal inner container and a metal outer container, a storage recess for storing a solid sealing material having a predetermined shape is formed on the bottom surface of the outer container; At the bottom of the storage recess, an exhaust port is formed which is sealed by stagnation of the sealing material that melts and flows down during evacuation, and at the opening of the storage recess, the stored solid sealing material is dropped. The present invention is characterized in that a falling-off preventing member for prevention is provided.

In the basic configuration of the present invention, there are the following preferred embodiments.

In other words, it is preferable that the inside and outside of the storage recess be communicated with each other through a ventilation portion that allows hot air to enter the inside during vacuum evacuation, since the sealing material can be easily melted by the hot air during evacuation. .

[0012] Further, the drop-off preventing member is provided with a regulating means for regulating the movement of the sealing material in the storage recess, so that the movement of the sealing material in the storage recess is controlled and the positioning and positioning of the sealing material are performed. This is preferable in that protection can be obtained.

Further, it is preferable that the sealing material can be stored in the storage recess in a state where the falling-off preventing member is attached, from the viewpoint of improving workability.

[0014]

According to the basic structure of the present invention, the following effects can be obtained by the above means.

That is, even if the carrier frame swings when the carrier is transported while being placed on the carrier frame in a state where the sealing material is stored in the storage recess, the sealing material falls off from the predetermined position due to the presence of the falling-off prevention member. Will not be done.

In the first basic configuration of the present invention, when the inside and outside of the storage recess are communicated through a ventilation portion that allows hot air to enter the inside during vacuum evacuation, the hot air during vacuum evacuation is sealed off. Since it is possible to easily enter the storage recess in which the porous material is stored, the presence of the falling-off preventing member does not hinder the melting of the sealing material.

Further, when the drop-off preventing member is provided with a restricting means for restricting the movement of the sealing material in the storage recess, the movement of the sealing material in the storage recess is restricted. The material can be properly positioned, and the protection can be reliably obtained even when a glass material that is easily damaged is used as the sealing material.

Further, in the first basic configuration of the present invention, when the sealing material can be stored in the storage recess in a state where the falling-off preventing member is attached, the sealing material is sealed before being mounted on the carrier frame. The hole material can be stored, and workability is significantly improved.

[0019]

According to the basic structure of the present invention, in a metal vacuum double container composed of a metal inner container and a metal outer container, a solid solid material having a predetermined shape is provided on the bottom surface of the outer container. An accommodating recess for accommodating the sealing material is formed, and at the bottom of the accommodating recess, an exhaust port that is sealed by stagnation of the sealing material that melts and flows down during evacuation is formed, and an opening of the accommodating recess is formed. Is provided with a falling-off preventing member for preventing the stored solid sealing material from falling off, so that the double container is placed in an inverted state, and the sealing material is stored in the storage recess and placed on the carrier frame for transfer. In this case, even if the carrier frame swings, the presence of the falling-off preventing member prevents the sealing material from dropping from the predetermined position, and greatly contributes to improvement of sealing accuracy and automation of the sealing operation. effective

Further, since the sealing material can be stored before being mounted on the carrier frame, there is also an effect that the working efficiency is improved.

Furthermore, when a sealing material having a low melting point is employed, vacuum sealing at a lower temperature can be performed as compared with the conventional vacuum brazing method requiring a high temperature operation (ie, a joining method using a brazing metal). Thus, the degree of decrease in tensile strength of the container base material is small, the thickness of the container base material can be reduced as much as possible, and there is also an effect that the product can be reduced in weight and cost.

[0022]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

First Embodiment FIGS. 1 to 3 show a vacuum sealing structure of a metal vacuum double container according to a first embodiment of the present invention.

FIG. 1 shows the entire structure of an inverted state of a metal vacuum double container before vacuum sealing, and the metal vacuum double container has a metal (for example, stainless steel) inner container. 1A and the outer container 1B are connected to each other on the side of the mouth portion 2 to form a double container 1;
The heat insulating structure having a vacuum heat insulating space is realized by evacuating the space 3 formed between 1B.

The inner container 1A has a bottomed bottle shape, and is supported on the mouth 2 side by joining with the outer container 1B. Further, the outer container 1B is a bottomed cylindrical body obtained by integrally fitting the bottom plate 6 to the opening edge 5 on the side of the bottom portion 4 having a reduced diameter by a predetermined dimension.

The bottom plate 6 is formed by bending a peripheral edge portion 6a into a hook shape and bulging outward at a central portion in an inverted trapezoidal shape with a ring-shaped groove 7 being left between the peripheral edge portion 6a and the peripheral edge portion 6a. The shape is such that a bulging portion 8 is formed.

At the center of the flat bottom surface 8a of the bulging portion 8 of the bottom plate 6, a storage recess 9 is formed which is cylindrically recessed by a predetermined depth toward the inner container 1A. The storage recess 9 is provided with a sealing material 10 for vacuum sealing described later.
Is to be stored and arranged.

At the bottom 9a of the storage recess 9, a downwardly facing funnel-shaped recess 11 is formed in an inverted state of the container shown in the figure, and the bottom of the funnel-shaped recess 11 has a small-diameter exhaust port 1.
2 are formed. The upper end diameter of the funnel-shaped recess 11 is formed smaller than the inner diameter of the bottom 9 a of the storage recess 9. In addition, the exhaust port 12 communicates with the space 3 of the double container 1.

The sealing material 10 is formed by molding a solid brazing material made of glass into a cylindrical shape, and melts at a relatively low temperature. In addition, as the sealing material 10, Ni brazing material etc. other than glass brazing material can also be adopted.

Thus, the sealing material 10 is accommodated in the accommodating recess 9 so as to be located on the bottom 9a and straddle the upper end opening of the funnel-shaped recess 11.

Further, a rectangular flat plate-shaped drop-off is provided at the opening of the storage recess 9 by spot welding one end to the bottom plate 6 and the other end extending above the storage recess 9 and supported by a cantilever. A prevention member 13 is provided.

The falling-off preventing member 13 functions to prevent the sealing material 10 housed in the housing recess 9 from falling off, and as shown in FIG. A ventilation portion 14 that connects the inside of the storage recess 9 with the outside is formed. The ventilation portion 14 allows the hot air at the time of vacuum evacuation to enter the storage recess 9, so that the sealing material 10 stored in the storage recess 9 can be heated and melted. Has become. In the case of the present embodiment, storage of the sealing material 10 is performed by lifting the free end of the falling-off preventing member 13 after the falling-off preventing member 13 is fixed.

As described above, the sealing material 10 is
The double container 1 housed in the inside is mounted on a carrier frame and transferred into an evacuated chamber, and in the process of being transferred through the evacuated chamber, first the exhaust port 12 is heated at a temperature lower than the melting point of the sealing material 10. After the air between the inner and outer containers 1A and 1B is degassed (that is, baked), the air is heated at a temperature higher than the melting point of the sealing material 10 (that is, sealed). As a result, the sealing material 10 melts and flows downward, is guided by the funnel-shaped recess 11, reaches the exhaust port 12, and stays there.
As shown by reference numeral 10 'in FIG. 3, the exhaust port 12 is securely sealed.

That is, in the case of the present embodiment, even when the carrier frame is rocked when the carrier is transported on the carrier frame in a state where the sealing material 10 is housed in the housing recess 9,
The presence of the falling-off prevention member 13 prevents the sealing material 10 from falling off from a predetermined position, which greatly contributes to improvement of sealing accuracy and automation of the sealing operation. In addition, the presence of the ventilation portion 14 allows hot air at the time of evacuation to easily enter the storage recess 9 in which the sealing material 10 is stored, so that the presence of the falling-off preventing member 13 hinders the melting of the sealing material 10. Never.

Further, since the sealing material 10 can be stored before being mounted on the carrier frame, the working efficiency is greatly improved.

Further, since the sealing material 10 having a low melting point is employed, the vacuum sealing at a lower temperature can be performed as compared with the conventional vacuum brazing method requiring a high temperature operation (ie, a joining method using a brazing metal). This makes it possible to perform the stopping operation, the degree of decrease in the tensile strength of the container base material is small, the thickness of the container base material can be reduced as much as possible, and the weight and cost of the product can be reduced.

In this embodiment, the sealing member 10 is stored after the falling-off preventing member 13 is fixed. However, the sealing member 10 may be fixed after the sealing member 10 is stored. is there.

Second Embodiment FIGS. 4 and 5 show a vacuum sealing structure of a metal vacuum double container according to a second embodiment of the present invention.

In the case of the present embodiment, the falling-off preventing member 13 is formed in a substantially elliptical shape having a width increasing from the cantilever fixed end side (that is, the joining portion side) toward the free end side. Is formed with a hole serving as a ventilation portion 14. That is, in the case of the present embodiment, the ventilation portions 14 are formed on the peripheral side and the free end side of the falling-off preventing member 13. In this case, the concave portion 9 for storing hot air during evacuation is used.
Since the intrusion into the inside is more effective than in the first embodiment, the sealing material 10 can be more reliably melted. The other configuration and operation and effect are the same as those of the first embodiment, and the description is omitted to avoid duplication.

Third Embodiment FIGS. 6 and 7 show a vacuum sealing structure of a metal vacuum double container according to a third embodiment of the present invention.

In the case of this embodiment, the sealing material 10 in the storage recess 9 is attached to the falling-off prevention member 13 having the same shape as that of the first embodiment.
Downward projection 1 acting as a regulating means for regulating the movement of
5 are provided. Moreover, in the case of the present embodiment, the falling-off preventing member 13 can be deformed from an upward state (that is, a state shown by a chain line) to a horizontal state (that is, a state shown by a solid line) starting from the fixed end side. That is, in the case of the present embodiment, the falling-off preventing member 13 is set in the state shown by the dashed line, and
After the sealing material 10 is housed and arranged in the inside,
To the state shown by the solid line. In this way, the sealing material 10 can be prevented from falling off, and the movement of the sealing material 10 in the storage recess 9 can be regulated, so that the positioning of the sealing material 10 can be properly obtained. Even if a glass material that is easily broken is used as the sealing material 10, the protection can be reliably obtained.
The other configuration and operation and effect are the same as those of the first embodiment, and the description is omitted to avoid duplication.

Fourth Embodiment FIGS. 8 and 9 show a vacuum sealing structure of a metal vacuum double container according to a fourth embodiment of the present invention.

In the case of this embodiment, the falling-off preventing member 13 is made of a plate material joined to the bottom plate 6 by spot welding in a double-supported state so as to straddle the upper end opening of the storage recess 9 and its longitudinal direction. The middle portion has a curved portion 16 that is directed upward when the container is in an inverted state. In addition,
In the case of the present embodiment, the ventilation portions 14 are formed on both sides of the falling-off prevention member 13. With this configuration, the openings 17 into which the sealing material 10 can be easily inserted on both sides of the curved portion 16.
Is formed, and the storage of the sealing material 10 is facilitated. The other configuration and operation and effect are the same as those of the first embodiment, and the description is omitted to avoid duplication.

Fifth Embodiment FIGS. 10 and 11 show a vacuum sealing structure of a metal vacuum double container according to a fifth embodiment of the present invention.

In this embodiment, the falling-off preventing member 13 is made of a plate material joined in a double-supported state as in the case of the fourth embodiment. The curved deforming portion 18 acting as a restricting means for restricting the movement of the sealing material 10 housed in the housing recess 9 by deforming from a state (shown by a dashed line) to a downwardly convex state (a state shown by a solid line). Is provided. When the curved deformation portion 18 is in the state shown by the dashed line, openings 19 are formed on both sides thereof so that the sealing material 10 can be easily inserted, and the storage of the sealing material 10 becomes easy. Then, if the curved deformation portion 17 is deformed as shown by the solid line after the storage of the sealing material 10, the movement of the sealing material 10 in the storage recess 9 can be restricted. Note that also in the case of the present embodiment, the ventilation portions 14 are formed on both sides of the falling-off prevention member 13. The other configuration and operation and effect are the same as those of the first embodiment, and the description is omitted to avoid duplication.

Sixth Embodiment FIGS. 12 and 13 show a vacuum sealing structure of a metal vacuum double container according to a sixth embodiment of the present invention.

In the case of this embodiment, the falling-off preventing member 13 is made of a plate material joined in a double-supported state as in the case of the fourth embodiment. A rectangular hole 20 having a slightly larger vertical and horizontal dimension than that of the rectangular hole 20 is formed. With this configuration, the sealing material 10 is housed in the housing recess 9 through the rectangular hole 20, and the sealing material 10 in the housed state has the rectangular hole 20 as described above. There is no risk of falling off from the rectangular hole 20.
In the case of the present embodiment, the rectangular hole 20 also functions as a ventilation part. The other configuration and operation and effect are the same as those of the first embodiment, and the description is omitted to avoid duplication.

Seventh Embodiment FIGS. 14 and 15 show a vacuum sealing structure of a metal vacuum double container according to a seventh embodiment of the present invention.

In the case of this embodiment, the falling-off preventing member 13 is made of a plate material which is in a double-supported state and is joined so as to cover the opening at the upper end of the storage recess 9 as in the case of the fourth embodiment. In the inverted state of the container, a rectangular trapezoidal protruding portion 21 which is convex upward is formed integrally, and a bottom surface 21a of the protruding portion 21 is also used as an insertion hole of the sealing material 10 and a ventilation portion. A rectangular hole 22 is cut out. Moreover,
An inwardly inclined tongue-shaped piece 23 which is left at the time of forming the cutout of the square hole 22 is formed integrally with the longitudinal side edge of the square hole 22. With this configuration, the sealing material 1
0 is inserted into the storage recess 9 from the square hole 22 while pushing the tongue 23 down, but after the tongue 23 is inserted,
Will be prevented from falling off. The other configuration and operation and effect are the same as those of the first embodiment, and the description is omitted to avoid duplication.

Eighth Embodiment FIGS. 16 and 17 show a vacuum sealing structure of a metal vacuum double container according to an eighth embodiment of the present invention.

In this embodiment, the falling-off preventing member 13 is made of a plate material joined in a double-supported state as in the case of the fourth embodiment. A protruding portion 24 having a truncated cone shape is formed integrally, and a circular hole 25 that serves both as an insertion hole for the sealing material 10 and a ventilation portion is cut out on the bottom surface 24 a of the protruding portion 24. In addition, an inward tapered piece 26 which is left at the time of forming the cutout of the circular hole 25 is formed integrally with the edge of the circular hole 25. With this configuration, the sealing material 10 is inserted into the storage recess 9 from the circular hole 25 while expanding the tapered piece 26, but after the insertion, the sealing material 10 is prevented from falling off due to the presence of the tapered piece 26. The Rukoto. In the case of the present embodiment, the sealing material 10 is stored in a vertically placed state in which one end is located in the funnel-shaped recess 11 in the storage recess 9. The other configuration and operation and effect are the same as those of the first embodiment, and the description is omitted to avoid duplication.

The present invention is not limited to the configuration of each of the above embodiments, and it is needless to say that the design can be changed as appropriate without departing from the gist of the invention.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a metal vacuum double container having a vacuum sealing structure according to a first embodiment of the present invention.

FIG. 2 is a plan view of a bottom portion of the metal vacuum double container having the vacuum sealing structure according to the first embodiment of the present invention.

FIG. 3 is an enlarged cross-sectional view of an exhaust port in a metal vacuum double container having a vacuum sealing structure according to the first embodiment of the present invention.

FIG. 4 is a plan view of a bottom portion of a metal vacuum double container having a vacuum sealing structure according to a second embodiment of the present invention.

FIG. 5 is an enlarged sectional view of an exhaust port in a metal vacuum double container having a vacuum sealing structure according to a second embodiment of the present invention.

FIG. 6 is a plan view of a bottom portion of a metal vacuum double container having a vacuum sealing structure according to a third embodiment of the present invention.

FIG. 7 is an enlarged cross-sectional view of an exhaust port in a metal vacuum double container having a vacuum sealing structure according to a third embodiment of the present invention.

FIG. 8 is a plan view of a bottom of a metal vacuum double container having a vacuum sealing structure according to Example 4 of the present invention.

FIG. 9 is an enlarged sectional view of an exhaust port in a metal vacuum double container having a vacuum sealing structure according to a fourth embodiment of the present invention.

FIG. 10 is a plan view of a bottom portion of a metal vacuum double container having a vacuum sealing structure according to a fifth embodiment of the present invention.

FIG. 11 is an enlarged sectional view of an exhaust port in a metal vacuum double container having a vacuum sealing structure according to a fifth embodiment of the present invention.

FIG. 12 is a plan view of a bottom portion of a metal vacuum double container having a vacuum sealing structure according to a sixth embodiment of the present invention.

FIG. 13 is an enlarged sectional view of an exhaust port in a metal vacuum double container having a vacuum sealing structure according to a sixth embodiment of the present invention.

FIG. 14 is a plan view of the bottom of a metal vacuum double container having a vacuum sealing structure according to Example 7 of the present invention.

FIG. 15 is an enlarged sectional view of an exhaust port in a metal vacuum double container having a vacuum sealing structure according to a seventh embodiment of the present invention.

FIG. 16 is a plan view of a bottom of a metal vacuum double container having a vacuum sealing structure according to Example 8 of the present invention.

FIG. 17 is an enlarged cross-sectional view of an exhaust port in a metal vacuum double container having a vacuum sealing structure according to Example 8 of the present invention.

FIG. 18 is a longitudinal sectional view of a metal vacuum double container having a conventionally known vacuum sealing structure.

FIG. 19 is an enlarged cross-sectional view of an exhaust port in a conventional metal vacuum double container having a vacuum sealing structure.

[Explanation of symbols]

1 is a double container, 1A is an inner container, 1B is an outer container, 2 is a mouth portion, 3 is a space portion, 6 is a bottom plate, 9 is a storage recess, 10 is a sealing material, 12 is an exhaust port, and 13 is a fall prevention. A member, 14 is a ventilation part, 15 is a regulating means (convex part), and 18 is a regulating means (curved deformation part).

Claims (4)

(57) [Claims] 1. A metal vacuum double container comprising a metal inner container and a metal outer container, wherein a bottom surface of the outer container is provided with a solid sealing material having a predetermined shape. An accommodating recess is formed, and at the bottom of the accommodating recess, an exhaust port is formed which is sealed by stagnation of a sealing material that melts down during vacuum evacuation. A vacuum sealing structure for a metal vacuum double container, comprising a falling-off preventing member for preventing a shape of a sealing material from falling off. 2. The metal vacuum double container according to claim 1, wherein the inside and outside of the storage recess are communicated via a ventilation portion that allows hot air to enter the inside during vacuum evacuation. Vacuum sealing structure. 3. The drop-off preventing member according to claim 1, further comprising a restricting means for restricting a movement of the sealing material in the storage recess. Vacuum sealed structure of metal vacuum double container. 4. The storage device according to claim 1, wherein the storage of the sealing material in the storage recess can be performed in a state where the falling-off preventing member is attached. The vacuum sealing structure of the metal vacuum double container according to the above.