JP3267161B2 - Metal vacuum double bottle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal vacuum double bottle in which a space between an inner container made of a metal such as stainless steel and an outer container has a vacuum heat insulating layer, and more particularly to an outer container. Evacuation holes formed for vacuum evacuation are used as sealing materials (brazing material)
And a metal vacuum double bottle manufactured by vacuum sealing.

[0002]

2. Description of the Related Art Conventionally, as this kind of metal vacuum double bottle, one disclosed in Japanese Utility Model Publication No. 7-19402 has been known. The metal vacuum double bottle described in this publication is shown in FIG.
8 , a metal inner container 100 having a bottomed cylindrical shape,
A metal outer container 101 having a bottomed cylindrical shape and having an exhaust hole 104 formed in the outer container bottom 101a is joined with a mouth 102,
In order to make the space 103 between the inner and outer containers 100 and 101 into a vacuum heat insulating layer, the inside of the space 103 is evacuated and then the exhaust hole 104 is vacuum sealed by melting a sealing material (brazing material) 105. It is made. That is, a substantially cylindrical peripheral wall 106 protruding toward the space 103 is formed around the inside of the exhaust hole 104, and the outer body of the exhaust hole 104 is turned upside down as shown in FIG. A sealing material 105 serving as a brazing material is placed on the periphery.

[0003] As described above, when the container is in an inverted state, the container is mounted on a carrier frame, transferred to an evacuation chamber, and vacuum-sealed while being moved in the evacuation chamber. Vacuum heat treatment is performed by a method of supporting in a vacuum heating furnace, sealing in the vacuum heating furnace, or the like. The vacuum heating operation will be described. First, the space 103 is evacuated to a desired degree of vacuum through the exhaust hole 104 at a temperature lower than the melting point of the sealing material 105. Then,
When the temperature of the sealing material 105 is raised to a temperature equal to or higher than the melting point of the sealing material 105, the sealing material 105 is melted, and the melted sealing material is discharged to the exhaust port 10.
After flowing into the inside of the peripheral wall 106, as shown in FIG.
Is sealed as indicated by reference numeral 105a.

[0004] Further, the above-mentioned substantially cylindrical peripheral wall 106 is formed as shown in FIG.
Speaking of 8 , the projection protrudes into the space 103 by a distance L1 from the base end (outer container bottom 101a) of the peripheral wall 106 to the tip, and air in the space 103 is discharged from the exhaust hole 104. The outer wall 106 is evacuated to evacuate the interior of the space 103 and the impact on the outer container bottom 101a.
In order to prevent the inside from abutting on the inner container 100 and the degree of vacuum in the space 103 from being deteriorated, a gap of a distance L2 between the tip of the peripheral wall 106 and the bottom of the inner container 100 is required. Accordingly, the base end of the peripheral wall 103 (the outer container bottom 10
The distance L0 from 1a) to the bottom of the inner container 100 is equal to the sum of L1 and L2. Therefore, in the above conventional example, the base end of the peripheral wall 103 (the outer container bottom 101a) and the inner container 1
The spacing between the bottoms of 00 requires a length of L0 = L1 + L2.

[0005]

However, in the above-described conventional metal vacuum double bottle, as described above, the peripheral wall 106 protruding around the inside of the exhaust hole 104 formed in the outer container bottom 101a is formed inside and outside. Space part 1 between both containers 100 and 101
Because it protrudes to the 03 side, in addition to the length of the L2,
The length L1 of the peripheral wall 106 is required. Therefore, the surrounding wall 1
There is a disadvantage that the distance between the base end of the inner container 06 (the outer container bottom 101a) and the bottom of the inner container 100 becomes long (L0 = L1 + L2).

Further, in the above-mentioned conventional metal vacuum double bottle, no treatment is taken against external shock to the outer container bottom 101a.

[0007] The present invention has been made in view of the above points, the distance (length) between the bottom of the outer container and the bottom of the inner container can be arbitrarily adjusted, and the overall height of the outer container can be shortened.
An object of the present invention is to provide a metal vacuum double bottle that is resistant to an external impact on the outer container bottom.

[0008]

Means for Solving the Problems The present invention is formed so as to surround the metal of the inner container, a metal outer container having an exhaust hole in the bottom, the exhaust pores hole edge near the exhaust hole a cylindrical body that is formed between the hole edge portion of the cylindrical body and the exhaust hole
Sealing a housing space for housing the sealing member, and a bottom cover for covering the bottom portion including a cylindrical body of the outer container, the space portion between the front Symbol inner and outer container was evacuated, the exhaust hole Te In a metal vacuum double bottle that is vacuum sealed by melting the pore material,
The tubular body is formed integrally with the bottom of the substantially flat outer container.
To the upper surface of the bottom of the outer container
And an annular raised projection projecting from
The lower end of the ring-shaped protruding projection and the exhaust hole are almost in the same horizontal plane
It is characterized in that it is formed in a shape .

Here, the term "sealing material" means a brazing material such as a soft solder or a hard brazing material such as a solder, and the shape thereof may be an arbitrary shape such as a rod shape or a granular material shape. Also,
Preferably, the solid state is better. The tubular body that stores the sealing material before vacuum sealing is in an inverted state of the container,
It can be appropriately selected from a cylindrical shape, an inverted trapezoidal cross-section, and a cylindrical shape with a part inclined.

[0010] The cylindrical body is separated from the bottom of the outer container so that the storage space has an inverted trapezoidal cross section in a substantially inverted state at the center of the bottom of the substantially flat outer container. It can also be fixed by fixing means such as welding or an adhesive. However, it is preferable to form the cylindrical body integrally with the bottom of the outer container because the fixing means such as welding or an adhesive as described above is unnecessary.

As the cylindrical body, an exhaust hole is formed substantially at the center of the bottom of the substantially flat outer container, and on the outer peripheral side of the exhaust hole, a steeply inclined surface having a steep slope on one side and a gentle slope on the other side are provided. An annular upright projection having a gentle slope is formed integrally, and a storage space is formed between the inside of the annular uplift projection and the hole edge of the exhaust hole. It is preferable that the sealing member be accommodated on the surface side. According to such a configuration, the sealing material that has been melted when the sealing material is melted flows down the gentle slope smoothly, thereby reliably sealing the exhaust hole.

[0012] and the metal of the inner container, a metal outer container having an exhaust hole in the bottom, a cylindrical body which is formed so as to surround the exhaust pores hole edge near the exhaust hole, the tubular body and interior storage space of the formed sealing material for a housing, and a bottom cover for covering the bottom portion including a cylindrical body of the outer container, the space portion between the front Symbol inner and outer containers after evacuation, In a metal vacuum double bottle in which the exhaust hole is vacuum-sealed by melting a sealing material, the cylindrical body is an outer container in an inverted state of a body.
The bottom plate is fixed to the upper surface of the bottom and upward from the bottom of the outer container.
An inverted trapezoidal shape of the container shape that protrudes may be employed a material obtained by forming a communication hole communicating with the exhaust hole in the bottom plate. According to such a configuration, the bottomed bottom plate protects against external shock to the body.

[0013] and the metal of the inner container, a metal outer container having an exhaust hole in the bottom, a cylindrical body which is formed so as to surround the exhaust pores hole edge near the exhaust hole, the tubular body and interior storage space of the formed sealing material for a housing, and a bottom cover for covering the bottom portion including a cylindrical body of the outer container, the space portion between the front Symbol inner and outer containers after evacuation, in metallic vacuum double bottle comprising vacuum sealed by melting the sealing material and the exhaust hole, the cylindrical body is in the inverted state of the device body, the outer container
The bottom plate is fixed to the upper surface of the bottom and upward from the bottom of the outer container.
With protruding, the stepped shape of the container having an open top to form a communication hole communicating with the exhaust hole in the bottom plate to form a small diameter of the storage space the diameter of the storage space at the bottom to the top,
A sealing material is supported on the stepped portion of the large-diameter storage space , and a pair of engaging claws are provided on the upper opening edge of the cylindrical body so as to project inward along a diameter line. An ingrown nail can also be used as a fall-off prevention piece. Even in this case,
The drop-off preventing piece made of the engaging claw can prevent the sealing material from dropping out of the storage space during the vacuum heating process.

When the inner container and the outer container joined by the mouth are in an inverted state as shown in FIG. 1, a cylindrical body surrounding the exhaust hole is provided near the hole edge of the exhaust hole formed in the outer container bottom. of
A sealing material is provided protruding upward from the upper surface, and is disposed in a storage space formed between the cylindrical body and the edge of the exhaust hole. next,
For example, by performing a vacuum heating process at a melting temperature of the sealing material or lower in a vacuum heating furnace, air in the space between the inner and outer containers is exhausted from the exhaust hole, and the space is evacuated. Further, the temperature of the sealing material is raised to a temperature equal to or higher than the melting temperature of the sealing material to melt the sealing material, and the entire sealing hole and a part or all of the storage space of the cylindrical body are vacuum-sealed by the melted sealing material. . Through such an operation, the space between the inner container and the outer container is evacuated, and the heat insulating effect is achieved by the space. Then, a metal vacuum double jar is manufactured by covering the bottom of the outer container including the cylindrical body with a bottom lid.

[0015]

Embodiment 1 Embodiment 1 of the present invention is shown in FIGS.
This will be described below with reference to FIG. 1 is a partial sectional view showing the entire metal vacuum double bottle before vacuum sealing and in an inverted state, FIG. 2 is an enlarged sectional view of the bottom part of FIG. 1 , and FIG. FIG. 4 is an enlarged sectional view of the vicinity of the cylindrical body of FIG.
FIG. 2 is an enlarged cross-sectional view of the vicinity of the cylindrical body in FIG. 1 after vacuum sealing.

FIG. 1 shows the overall structure of a metal vacuum double bottle in an inverted state before vacuum sealing. The metal vacuum double bottle is made of metal such as stainless steel and has a bottomed cylinder. An inner container 1 formed into a shape and an outer container 2 also made of a metal such as stainless steel and having a bottomed cylindrical shape and a bottom portion formed in a substantially flat plate shape.
a, a double container 3 joined on the side of 2a, and the inside of a space 4 formed between the inner container 1 and the outer container 2 is evacuated through an exhaust hole 5 formed in the bottom 2B of the outer container. After that, the exhaust hole 5 is vacuum-sealed (see FIG. 4) by melting a sealing material (brazing material) 20 so that the space portion 4 becomes a vacuum heat insulating layer.

The inner container 1 has a bottomed bottle shape and the mouth 1a side is smaller in diameter than the body 1b. The outer container 2 includes a cylindrical outer container body 2A having a reduced diameter on the mouth side, and the outer container body 2A.
And a substantially flat outer container bottom 2B which is fitted inside and joined to the bottom opening edge 2A1. The outer container bottom 2B
An exhaust hole 5 for evacuation of a small hole is formed at the center of the hole. The exhaust holes 5 are for evacuating the air in the space 4 to evacuate the space 4.

[0018] In the inverted state of the device body on the exhaust hole 5
In the vicinity of the peripheral edge of the side, a cylindrical body 10 having an inverted trapezoidal cross section having a large diameter at the front end and a small diameter at the base end is formed integrally with the outer container bottom 2B , surrounding the exhaust hole 5. The inverted body
Projecting upward on the upper surface of the outer container bottom 2B in the state
It is formed . The cylindrical body 10 has a substantially flat outer container bottom.
Pressing the center of the part 2B (not limited to the center)
Are integrally formed. That is, as shown in FIG.
The cylindrical body 10 is pressed to the center by pressing or the like.
The exhaust hole 5 is pierced, and an annular protrusion is formed on the outer peripheral side of the exhaust hole
The protrusion 13 is integrally formed, and the annular protrusion
Storage space with an inverted trapezoidal cross section between the side and the hole edge of the exhaust hole 5
A space 11 is formed, and a space other than the exhaust hole 5 of the storage space 11 is formed.
The sealing material 20 is stored in the storage device. Storage space 1
The base end side of 1 communicates with the space 4 through the exhaust hole 5
I have. Further, the lower end 13a of the annular protruding projection 13
Is formed so as to be substantially flush with the exhaust hole 5.
You.

As described above, the cylindrical body 10 is connected to the outer container bottom 2B.
When formed integrally with, welding welding point is not required can be omitted.

As described above, the cylindrical body 10 is
Without facing inside , the outer container bottom 2B
Since it protrudes upward, the distance L between the outer container bottom 2B and the bottom 1C of the inner container 1 can be any distance (length) as long as the space 4 exists. Therefore, apart from the width between the outermost bottom 1C of the outer container bottom portion 2B and the inner container 1 can be reduced. For example, the width may be equal to or smaller than the width of the body portion between the inner and outer containers 1 and 2 in FIG.
This makes it possible to reduce the overall height of the container, that is, the double container 3, and to reduce the size of the metal vacuum double bottle.

The sealing material 20 may be a solid brazing material made of glass and formed into a cylindrical shape, or other metal brazing material. The shape of the sealing material is not limited, and may be appropriately selected.

As shown in FIG. 1, when the double container 3, which is a vessel, is turned upside down with its mouth facing downward, the cylindrical
Double container 3 in which sealing material 20 is arranged in storage space 11
Is mounted on a carrier frame and transferred to an evacuation chamber, for example. In the process of being transferred in the vacuum evacuation chamber, first, air in the space 4 between the inner and outer containers 1 and 2 is degassed from the evacuation hole 5 at a temperature lower than the melting point of the sealing material 20, When heated at a temperature higher than the melting point of the sealing material 20 after the degree of vacuum is reached, the sealing material 20 is melted and flows downward in the inverted state of FIG. Then, the gas flows into the exhaust hole 5, and the exhaust hole 5 is securely sealed as shown in FIG.

After the vacuum heating operation of the double container 3 is performed as described above, the bottom 2B of the outer container including the cylindrical body 10 is covered with the bottom cover 30. That is, the bottom cover 30
Is made of metal or synthetic resin, and the opening edge 31 of the bottom lid 30 is externally fitted to the outer peripheral surface of the bottom opening edge 2A1 of the outer container body 2A and press-fitted.

For this reason, since the cylindrical body 10 is provided inside the bottom cover 30 so as to be opposed to the bottom cover 30, even if the bottom cover 30 is subjected to an external impact due to an accidental dropping of the container body or the like. The cylindrical body 10 provided on the outer container bottom 2B absorbs the external impact, so that the outer container bottom 2B and the bottom cover 30 are prevented from being dented. In other words, the cylindrical body 10 is connected to the outer container bottom 2.
B and bottom cover 30.

[0025]

The form state 2 of the present invention a second embodiment of the invention Figure 5 -
It will be described below with reference to FIG. 5 is a partial cross-sectional view of the bottom portion of the metal vacuum double bottle before vacuum sealing and in an inverted state, FIG. 6 is an enlarged cross-sectional view of the vicinity of the cylindrical body of FIG. 5 before vacuum sealing, and FIG. FIG. 6 is an enlarged cross-sectional view of the vicinity of the cylindrical body in FIG. 5 after sealing.

The second embodiment is different from the shape state first embodiment,
The tubular body 10 is integrally formed at the center (not limited to the center) of the metal-made substantially flat outer container bottom 2B by pressing or the like, and faces upward on the upper surface of the outer container bottom when the container is in an inverted state.
Although they are common in that they protrude ,
0 is different, and the other configuration is the same.

That is, as shown in FIG. 5 , the cylindrical body 10 in this case has an exhaust hole 5 formed at the center by press working or the like, and the outer peripheral side of the exhaust hole 5 has a steep slope on one side. An annular raised projection 14 having a steeply inclined surface 14a formed on the other side and a gentle inclined surface 14b is formed integrally with the outer container bottom 2B, and the annular raised projection 14 is formed. An accommodating space 11 is formed between the inside of 14 and the hole edge of the exhaust hole 5, and the sealing material 20 is accommodated in the gently inclined surface 14 b side of the accommodating space 11.

As described above, if the sealing material 20 is stored in the storage space 11 on the side of the gentle slope 14b, the sealing material 20 melted during vacuum sealing along the gentle slope 14b. It flows smoothly and reliably seals the exhaust hole 5.

In this case as well, the operation of the vacuum heat treatment, the other constructions and the effects are the same as in the first embodiment, so that the description will be omitted.

[0030]

The form state 3 of the present invention according to the third embodiment of the invention 8 to
It will be described below with reference to FIG. 8 is a partial cross-sectional view of the bottom portion of the metal vacuum double bottle before vacuum sealing and in an inverted state, and FIG . 9 is an enlarged cross-sectional view of the vicinity of the cylindrical body of FIG. 8 after vacuum sealing.

The form state 3 of this embodiment is different from the first embodiment,
With the tubular member 10 is bonded to the upper surface of the outer container bottom portion 2B in and welding 12 or the like separate from the outer container bottom portion 2B, different shape of the tubular body 10, other configurations are made as similar Things.

That is, as shown in FIG. 8 , when the container body (double container 3) is in an inverted state before vacuum sealing, as shown in FIG. It has a container shape which is gradually reduced in diameter and has a bottomed shape and an inverted trapezoidal cross section. The bottom plate 15 communicates with the exhaust hole 5 formed in the outer container bottom 2 </ b> B and the storage space 11 of the cylindrical body 10. A communication hole 15a is formed. This cylindrical body 10 is shown in FIG.
As described above, in a state where the communication hole 15a communicates with the exhaust hole 5, the outer container bottom 2B is joined to the outer container bottom 2B by projecting upward from the outer container bottom 2B by welding 12 or the like.

According to the third embodiment, the first embodiment
The bottom plate portion 15 has an advantage that the bottom plate portion 15 can further serve as a reinforcing member against an external impact since it has the bottom plate portion 15 as compared with the cylindrical body 10. Any form state 3 of this embodiment, vacuum heat treatment operations, other configurations and operational effects are the same as in the first embodiment, the description thereof is omitted to avoid duplication.

[0034]

The form state 4 of the present invention a fourth embodiment of the invention FIG. 10
This will be described below with reference to FIG . 10 is a partial cross-sectional view of a bottom portion of the metal vacuum double bottle before vacuum sealing and in an inverted state, and FIG . 11 is an enlarged cross-sectional view of the vicinity of the cylindrical body of FIG. 10 before vacuum sealing . It shows a state before the falling-off prevention piece formed in the shape is bent. FIG. 12 is a diagram.
10 , and FIG. 13 is an enlarged cross-sectional view of the vicinity of the cylindrical body after vacuum sealing in FIG.

The form state 4 of this embodiment is a same container shape cylindrical body 10 and <br/> shaped state to the third embodiment, the welding 12 or the like in the bottom plate portion 17 the outer container bottom portion 2B, FIG. 10 in the point that joining protrudes toward the upper side of the outer container bottom portion 2B, a communicating hole 17a which communicates with the housing space 11 of the exhaust hole 5 and the cylindrical body 10 which is formed on the outer container bottom portion 2B to the bottom plate portion 17 in that it is formed in common with the shape state 3 of the embodiment. However, the specific shape of the tubular body 10 is different between the two embodiments.

[0036] That is, the tubular body 1 in the form state to the third embodiment
Numeral 0 denotes an inverted state of the vessel, and its cross section is inverted trapezoidal. In contrast, the cylindrical body 10 in the form status fourth embodiment, FIG an inverted state of the device body
As shown in FIG. 11 , it has a stepped container shape with an open upper part, a large-diameter storage space 11a is formed at the upper part, a small-diameter storage space 11b is formed at the lower part, and a rod-shaped sealing material is formed in the large-diameter storage space 11a. The sealing material 20 is supported by the step portion 11C.

[0037] In addition, in the form state 4 of this embodiment, Fuanazai 20
Before storing in the large-diameter storage space 11a,
As shown by the solid line, the falling-off prevention piece 16 is extended outwardly and horizontally from the upper end of the opening of the cylindrical body 10 (the large-diameter storage space 11a) in a flange shape. The Fuanazai 20 space portion 4 is accommodated in the large diameter of the storage space 11a when the vacuum heat treatment, falling-off preventing piece 16 in FIG. 11 by bending the chain line state from the solid line state by utilizing the elasticity of the stainless steel The sealing material 20 is prevented from falling out of the storage space 11. That is, at the stage of performing the latter vacuum heating process, the falling-off prevention piece 16 is horizontally bent to the upper part of the storage space 11 as shown by the chain line in FIG . 11 and the solid line in FIGS. When the fall-off preventing piece 16 is in such a state, a ventilation portion 18 that connects the storage space 11 to the outside is formed on the peripheral side of the fall-off prevention piece 16,
The ventilation portion 18 allows hot air to enter the storage space 11 at the time of evacuation, so that the sealing material 20 stored in the storage space 11 can be heated and melted.

The provision of such a drop-preventing piece 16 can prevent the sealing material 20 from dropping out of the storage space 11 during the vacuum heating treatment operation, thereby improving the sealing accuracy and improving the sealing work. Automation can be reliably achieved.

Also in the fourth embodiment, the operation of the vacuum heat treatment, other structures and the effects are the same as those of the first embodiment.
4 and 4, and the description is omitted to avoid duplication.

[0040]

Fifth Embodiment FIG. 14 shows a fifth embodiment of the present invention .
17 will be described below. 14 is a partial cross-sectional view of the bottom portion of the metal vacuum double bottle before vacuum sealing and in an inverted state, FIG. 15 is an enlarged cross-sectional view of the vicinity of the cylindrical body of FIG. 14 before vacuum sealing, and FIG . 14 is a plan view of the cylindrical body and the sealing material, and FIG . 17 is an enlarged sectional view of the vicinity of the cylindrical body after vacuum sealing in FIG.

[0041] In the form state 5 in this embodiment, the tubular body 10, differ in shedding of structure that prevents ones and Fuanazai 20 in the form status fourth embodiments, the container tubular body 10 is stepped a shape, such as to support the sealing member 20 at the stepped portion 11C, other structures are those with the same as the form states fourth embodiment.

The cylindrical body 10 in this case, as falling-off prevention structure Fuanazai 20, without providing the captive piece 16 which is freely bent as in the form status fourth embodiments, made of stainless steel sheet or synthetic resin A pair of engaging claws 19a and 19b are provided on the upper opening edge inwardly on the diameter line in the inverted state of FIG. 19. In order to store the sealing material 20 in the storage space 11, in FIG. 16 , the sealing material 20 is stored in the storage space 11 at, for example, a chain line position avoiding the drop-off preventing pieces 19, 19, and then turned in the direction of the arrow. Lumber 2
The upper end of each of the zeros is restricted by falling-off preventing pieces 19 and 19.

Incidentally, the engaging claws 19a, 19b serving as drop-off prevention piece 19 and 19, by giving the elastic utilizing the material of the tubular body 10, Fuanazai as shown in FIG. 15 and FIG. 16 2
0 is the drop prevention pieces 19, 19 and the step 11 of the storage space 11.
It is also possible to make it sandwich with C.

[0044] By providing such a drop-off prevention member 19, the same advantages as the form status fourth embodiments. Any form state 5 in this embodiment, vacuum heat treatment operations, other configurations and operational effects are the same as in the first及beauty fourth embodiments, the description thereof is omitted to avoid duplication.

[0045]

(1) According to the first aspect of the present invention, an exhaust hole is formed in the bottom of the outer container, and a cylindrical body surrounding the exhaust hole is provided near the edge of the exhaust hole. , Almost flat
The outer container bottom portion and formed integrally, the device body in the inverted state odor
Ring protruding upward on the upper surface of the bottom of the outer container
Beneath the ring-shaped raised protrusion
The end and the exhaust hole are formed substantially in the same horizontal plane, and a sealing material is stored in a storage space formed between the cylindrical body and the hole edge of the exhaust hole, and the sealing material is melted. Since the exhaust hole is sealed, the distance (length) between the bottom of the outer container and the bottom of the inner container can be adjusted arbitrarily, the overall height of the outer container is shortened, and it is compact as a metal vacuum double bottle. Can be achieved.

(2) According to the first aspect of the present invention, in addition to the above configuration, the bottom of the outer container including the tubular body is covered with a bottom cover, and the tubular body is turned upside down. State in outer container
Even if the bottom lid receives an external impact, such as accidentally dropping the container body, since it is configured to protrude upward from the upper surface of the bottom, the cylindrical body provided upward at the bottom of the outer container is By absorbing the external impact, the bottom of the outer container and the bottom lid are prevented from being dented. In other words, the tubular body reinforces the outer container bottom and the bottom lid.

(3) Further, according to the first aspect of the present invention, as a cylindrical body, substantially at the center of the bottom of the substantially flat outer container,
Since the storage space is formed integrally with the bottom of the outer container so that the storage space has an inverted trapezoidal cross section when the container is in an inverted state, the cylindrical body is separated from the bottom of the outer container to fix welding, adhesive, or the like. As compared with the method of fixing by means, the above-mentioned fixing means such as welding and adhesive, and welding work are not required.

(4) According to the second aspect of the present invention, as the cylindrical body, an exhaust hole is formed substantially at the center of the bottom of the substantially flat outer container, and the outer peripheral side of the exhaust hole is inclined to one side. A steeply inclined surface is formed on the other side with an annular upsetting projection formed with a gentle slope at the other side, and between the inside of the annular uprising projection and the hole edge of the exhaust hole. Since the storage space is formed and the sealing material is stored on the side of the gentle slope of the storage space, the sealing material melted during vacuum sealing smoothly along the gentle slope. And the exhaust hole can be reliably sealed.

(5) According to claim 3 of the present invention,
In addition to the effect of claim 1, the tubular body is in an inverted state, the outer volume
The bottom plate is fixed to the upper surface of the bottom of the container, and is upward from the bottom of the outer container.
The container inverted trapezoidal shape protruding come, because communication hole communicating with the exhaust hole in the bottom plate portion is formed, the stronger reinforcing member the bottom plate portion is protected from external impact.

(6) According to claim 4 of the present invention,
In addition to the effect of item 1 , in the inverted state, the cylindrical body has a stepped container shape with an open upper part, a communication hole communicating with an exhaust hole is formed in the bottom plate part, and a large-diameter storage space is formed in an upper part. A storage space having a small diameter is formed at a lower portion, and a sealing material is supported at a step portion of the storage space having a large diameter. Further, a pair of engagement claws on a diameter line are provided at an upper opening edge of the cylindrical body. projecting the inwardly prevented since the engagement claw is a drop-off prevention piece, a pair of engagement claws serving disengagement prevention piece, coming off the sealing material from the storage space into a vacuum heat treatment operations Therefore, improvement of sealing accuracy and automation of sealing operation can be reliably achieved.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view showing the entirety of a metal vacuum double bottle before vacuum sealing and in an inverted state according to Embodiment 1 of the present invention.

FIG. 2 is an enlarged sectional view of a bottom portion of FIG.

FIG. 3 is an enlarged cross-sectional view of the vicinity of a cylindrical body in FIG. 1 before vacuum sealing.

FIG. 4 is an enlarged cross-sectional view of the vicinity of the cylindrical body of FIG. 1 after vacuum sealing.

FIG. 5 is a partial sectional view of a bottom portion of a metal vacuum double bottle before vacuum sealing and in an inverted state according to a second embodiment of the present invention.

6 is an enlarged cross-sectional view of the vicinity of the cylindrical body in FIG. 5 before vacuum sealing.

FIG. 7 is an enlarged cross-sectional view of the vicinity of the cylindrical body of FIG. 5 after vacuum sealing.

FIG. 8 is a partial sectional view of a bottom portion of a metal vacuum double bottle before vacuum sealing and in an inverted state according to a third embodiment of the present invention.

9 is an enlarged cross-sectional view of the vicinity of the cylindrical body in FIG. 8 before vacuum sealing.

10 is a partial cross-sectional view of a bottom portion of the metallic vacuum double bottle in and the inverted state before vacuum sealing form state 4 of the present invention.

11 is an enlarged cross-sectional view of the vicinity of the cylindrical body in FIG. 10 before vacuum sealing, and shows a state before bending a falling-off preventing piece formed in the cylindrical body.

FIG. 12 is a plan view of the vicinity of the cylindrical body in FIG. 10 ;

[Figure 13] shows an enlarged cross-sectional view in the vicinity of the tubular member after the vacuum sealing in FIG.

14 is a partial cross-sectional view of a bottom portion of the metallic vacuum double bottle in and the inverted state before vacuum seal in the form status fifth embodiment of the present invention.

FIG. 15 is an enlarged sectional view of the vicinity of the cylindrical body of FIG. 14 before vacuum sealing.

16 is a plan view of the tubular member and the sealing member in FIG. 14.

Is an enlarged sectional view of the tubular body near the after vacuum sealing in [17] FIG.

FIG. 18 is a partial cross-sectional view showing the entirety of a conventional metal vacuum double bottle in an inverted state.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Inner container 1a mouth 1c bottom most 2 outer container 2a mouth 2B outer container bottom 3 double container 4 space 5 exhaust hole 10 cylindrical body 11 storage space 13 annular upsetting projection 14 annular upsetting projection 16 Fall Prevention Piece 17 Bottom Plate 19 Fall Prevention Piece 20 Sealing Material 30 Bottom Cover L Distance between bottom of outer container and bottom of inner container

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) A47J 41/02 102

Claims (4)

(57) [Claims] And 1. A metallic inner container, a metallic outer container having an exhaust hole in the bottom, a cylindrical body which is formed so as to surround the exhaust pores hole edge near the exhaust hole, the cylindrical a housing space for housing the sealing member is formed between the hole edge portion of the Jo body and the exhaust hole, a bottom cover for covering a bottom portion including a cylindrical body of the outer container
The provided, the space portion between the front Symbol inner and outer container was evacuated, the metallic vacuum double bottle comprising vacuum sealed by melting the sealing material and the exhaust hole, the tubular body is substantially flat Formed integrally with the bottom of the outer container
To the upper surface of the bottom of the outer container
And an annular raised projection projecting from
The lower end of the ring-shaped protruding projection and the exhaust hole are almost in the same horizontal plane
A metal vacuum double jar, characterized in that it is formed into a shape . 2. An exhaust hole is formed substantially at the center of the bottom of a substantially flat outer container as a cylindrical body, and a steeply inclined surface having a steep slope on one side is formed on the outer peripheral side of the exhaust hole on the other side. An annular upright projection having a gentle slope is formed integrally, and a storage space is formed between the inside of the annular upright projection and the hole edge of the exhaust hole. 2. The metal vacuum double bottle according to claim 1, wherein a sealing material is accommodated on the gentle slope side. 3. A metallic inner container, a metallic outer container having an exhaust hole in the bottom, a cylindrical body which is formed so as to surround the exhaust pores hole edge near the exhaust hole, the cylindrical and formed inside the receiving space for the sealing material housing of Jo body, and a bottom cover covering the base portion including a <br/> tubular body of said outer container, the space portion between the front Symbol inner and outer containers the after evacuation, the metallic vacuum double bottle comprising vacuum sealed by melting the sealing material and the exhaust hole, the cylindrical body is in the inverted state of the device body, of the outer container bottom portion
The bottom plate is fixed to the upper surface and projects upward from the bottom of the outer container
A metal vacuum double bottle having an inverted trapezoidal container shape, wherein a communication hole communicating with an exhaust hole is formed in the bottom plate portion. 4. A metallic inner container, a metallic outer container having an exhaust hole in the bottom, a cylindrical body which is formed so as to surround the exhaust pores hole edge near the exhaust hole, the cylindrical and formed inside the receiving space for the sealing material housing of Jo body, and a bottom cover covering the base portion including a <br/> tubular body of said outer container, the space portion between the front Symbol inner and outer containers the after evacuation, the metallic vacuum double bottle comprising vacuum sealed by melting the sealing material and the exhaust hole, the cylindrical body is in the inverted state of the device body, of the outer container bottom portion
The bottom plate is fixed to the upper surface and projects upward from the bottom of the outer container
And a stepped container with an open top,
A communication hole communicating with the exhaust hole is formed in the bottom plate portion, a large-diameter storage space is formed in an upper portion, a small-diameter storage space is formed in a lower portion, and a sealing material is supported on a step portion of the large-diameter storage space. Yes in the further projecting inward a pair of engaging claws on diametrical line on the top opening edge of the tubular body, a metallic vacuum two, characterized in that the engagement claw is a falling-off preventing piece Heavy bottle.