JP3509489B2 - Sealing method for vacuum double structure - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for sealing a vacuum double structure such as a thermos, a vacuum double tube, a vacuum heat insulating panel and the like.

[0002]

2. Description of the Related Art Conventionally, as a method for sealing a vacuum double structure, for example, a thermos bottle composed of an inner bottle and an outer bottle made of metal, in Japanese Patent Publication No. 61-1136, an exhaust hole is formed by using a sealing member. A method of venting is provided. In this method, an exhaust hole is provided in the bottom plate of the outer bottle, and a brazing material is arranged around the exhaust hole of the bottom plate on the space side between the inner bottle and the outer bottle, and is sealed on the brazing material. After the stopper member is supported and the inner bottle and the outer bottle are assembled to form a double container, the double container is placed in a vacuum furnace to form a space between the inner bottle and the outer bottle. Exhaust from the exhaust hole. After that, the temperature inside the vacuum furnace is raised to melt the brazing material, so that the sealing member is dropped onto the exhaust hole to seal the exhaust hole.

[0003]

However, in the above-mentioned sealing method, there is no means for restricting the movement of the brazing material or the sealing member, and the brazing material and the sealing member are placed between the inner bottle and the outer bottle. Since it is arranged on the space side, once assembled as a double container, it is not possible to visually confirm the arrangement state of these, and in the state in which this double container is formed, the brazing material and the sealing member are If the outer bottle is dislocated from the bottom plate or if the position of the outer bottle is displaced, a sealing failure may occur, resulting in lack of certainty. Therefore, in the assembled state of the double container, the brazing filler metal and the sealing member are not separated from the mounting position,
Workability was also unfavorable because it had to be handled carefully. Therefore, an object of the present invention is to provide a method for sealing a vacuum double structure, which has good workability and can reliably seal the exhaust hole to ensure stable quality.

[0004]

In order to solve the above-mentioned problems, in the method for sealing a vacuum double structure of the present invention, the space formed by the constituent members is exhausted from the exhaust holes formed in the constituent members. A method of sealing a vacuum double structure, in which the exhaust hole is sealed from the space side with a sealing material through a brazing material, the brazing material or the sealing member not facing the exhaust hole. A ventilation part for communicating the exhaust hole with the space, and the exhaust hole
A guide wall for holding a side portion of the sealing member is provided on the space side of at least one of the component member and the second component member facing the first component member, and an exhaust hole on the space side of the first component member. While positioning the brazing material around the brazing material, disposing the sealing member between the brazing material and the second constituent member, and restricting the horizontal movement of the sealing member by the guide wall. By restricting vertical movement between the first component member and the second component member through the brazing material, exhausting the space through the exhaust hole and the ventilation part, and then melting the brazing material The sealing member is lowered and the exhaust hole is sealed by the sealing member.

According to the above vacuum double structure sealing method,
The sealing member for sealing the exhaust hole and the brazing material are arranged on the space side formed by the constituent members. The brazing material and the sealing member are the first constituent member having the exhaust hole. Since the horizontal movement and the vertical movement are restricted between the first constituent member and the facing second constituent member, they do not deviate from a predetermined arrangement position. As a result, it is possible to improve workability because it is not necessary to handle it relatively carefully before vacuum evacuation. Further, when the exhaust hole is sealed, the brazing material is melted and the sealing member is moved down to ensure the sealing.

The guide wall is composed of an inner wall of a concave portion provided in the first component member so as to project outward from the space side, and the lower portion of the sealing member is arranged in the concave portion so that the sealing is performed. It is preferable to regulate the movement of the stop member. Alternatively, the guide wall is formed of an inner wall of a recess provided in the second component member so as to project outward from the space side, and the sealing is performed by disposing an upper portion of the sealing member in the recess. Movement of members may be restricted. In these cases, it is preferable that the guide wall is provided with a guide convex portion that is close to the outer peripheral portion of the sealing member, and rattling of the sealing member is suppressed before the sealing.

The brazing material may be an integrally molded annular solid brazing material. By fixing the solid brazing material to the sealing member, it is preferable to dispose a sealing member integrated with the brazing material in the first constituent member or the second constituent member. When forming a ventilation part in these solid brazing materials, it is preferable that the ventilation part is formed by a groove provided between the inner peripheral edge and the outer peripheral edge of the annular solid brazing material.

The brazing material may be melted and fixed to the first constituent member or the second constituent member. When forming the ventilation part in the brazing filler metal, it is preferable that the ventilation part be formed by a space between the adjacent brazing filler metals by melting and fixing the brazing filler metal into pieces in a circumferential direction at a predetermined interval.

Further, the sealing member is composed of a bottom plate portion facing the exhaust hole, and a locking wall portion extending from at least a part of an outer edge portion of the bottom plate portion to the second component member side. be able to. In this case, it is preferable that a folding portion is provided at an upper end portion of the locking wall portion of the sealing member and the movement is restricted by positioning the brazing material and the second constituent member in a stable state. Further, it is preferable that the bottom plate portion of the sealing member is provided with a convex portion that is inserted into the exhaust hole when the sealing member descends so that the exhaust hole can be reliably sealed.

When the ventilation member is formed in the sealing member, the ventilation member may be recessed from the bottom plate portion to the locking wall portion. Or, the ventilation part,
A plurality of guide protrusions may be provided on the bottom plate, and a space between the adjacent guide protrusions may be formed. In this case, it is preferable that the guide protrusion is extended to the outer surface of the locking wall, and the guide protrusion on the locking wall side restricts the horizontal movement of the sealing member.

Further, it is preferable that the first component is a member forming a bottom plate in the vacuum double structure.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. (First Embodiment) FIG. 1 shows a vacuum bottle 1 which is a vacuum double structure manufactured by the sealing method of the first embodiment of the present invention. The thermos bottle 1 is a vacuum double container composed of an outer bottle 2 (first component member) made of metal such as stainless steel and an inner bottle 3 (second component member). The outer bottle 2 and the inner bottle 3 are joined to each other by welding or the like at their mouths, and a space S is formed between them.

The bottom plate 2a of the outer bottle 2 which is the first component.
A concave portion 4 that protrudes outward from the space S side is provided at the center of the. The inner diameter of the recess 4 has a sealing member 6A described later.
Has a diameter capable of forming a gap larger than at least the area of the exhaust hole 5 to be described later, and the inner surface thereof has a sealing member 6
It plays the role of a guide wall that regulates the horizontal movement of A.
Here, in order to play the role of the guide wall, the diameter is not made larger than necessary. An exhaust hole 5 is formed at the center of the bottom of the recess 4. The exhaust hole 5 is sealed by fixing a sealing member 6A on the brazing material 7A that is melted and fixed to the concave portion 4 of the bottom plate 2a. The exhaust hole 5 has a diameter of about 3.5 mm or more, and has a diameter or shape such that the molten brazing material 7A flows down. here,
If the thermos is constructed so that the exhaust hole is sealed only by the brazing material, the diameter of the exhaust hole needs to be about 2 mm at the maximum. Compared with this, in this embodiment, it is about 1.5 m.
m or more (175% or more) is also set large.

The sealing member 6A is, as shown in FIG.
From the outer peripheral edge of the disc-shaped bottom plate portion 6a to the cylindrical locking wall portion 6b
It has a cylindrical shape with a bottom. A folding-back portion 6c formed by folding back outward is provided at the upper edge of the locking wall portion 6b. As shown in FIGS. 2 (A) and 2 (B), the sealing member 6A is a brazing material 7A arranged in the recess 4 of the bottom plate 2a.
The second plate facing the bottom plate 2a while being placed on the upper part of the
The height is set to be substantially in contact with the bottom portion 3a of the inner bottle 3 which is a constituent member. In addition, when the clearance in the concave portion 4A is large, the gap with the bottom portion 3a can be set within a range in which the sealing member 6A cannot move laterally from the concave portion 4, but in view of compactness. The above settings are preferred. Further, in the present embodiment, the sealing member 6A has good wettability on the surface of the magnetic metal material, for example, Sn, Pb, Z.
It is formed by plating metal such as n, Ni, Cu.

Next, a method of sealing the thermos bottle 1 will be described. First, before assembling the double container 1 ′, flux or the like is applied to the periphery of the exhaust hole 5 on the space S side of the bottom plate 2 a of the outer bottle 2 so as to be attached thereto.
Instead of the flux, Sn, Pb, Sn / Pb alloy, Zn or Ni having good wetting property is formed on the inner peripheral surface of the recess 4.
You may perform metal plating such as.

Thereafter, the inner bottle 3 is inserted into the body 2b of the outer bottle 2 and the mouth portions of the outer bottle 2 and the inner bottle 3 are fixed to each other by welding or the like.

Next, the brazing material 7A is placed in the recess 4 of the bottom plate 2a. Brazing material 7A used in this embodiment
Is a solid annular brazing filler metal having a thickness smaller than the height of the guide wall of the concave portion 4, and as shown in FIG. 3, grooves are provided in the upper part thereof at a predetermined interval in the circumferential direction, and by the grooves, A ventilation part 8 for communicating the exhaust hole 5 of the first component member 2a with the space S is formed. The size of the ventilation part 8 is such that the brazing material 7A, which will be described later, melts and the sealing member 6A
When the outer bottle 2 and the inner bottle 3 are deformed toward the space S when the bottom plate 2a is closed and the exhaust hole 5 of the bottom plate 2a is closed, the sealing member 6A
Has a capacity such that the upper end thereof does not come into contact with the inner bottle 3 and has a cross-sectional area larger than that of the exhaust hole 5. Further, this brazing filler metal 7A is approximately 200 to 450 ° C. in the present embodiment.
Although a brazing material that melts at a temperature of ° C is used, a brazing material having an arbitrary melting point can be used depending on the manufacturing method. In addition,
The brazing material 7A may be fixed to the bottom surface of the recess 4 via another brazing material that is melted and fixed. Further, it may be fixed to the bottom plate portion 6a of the sealing member 6A. Then, the sealing member 6A is placed on the brazing material 7A from the bottom plate portion 6a side.

Next, the brazing material 7A and the sealing member 6 are thus formed.
The bottom plate 2a on which A and A are arranged is arranged on the bottom opening of the body 2b of the outer bottle 2 and joined by welding or the like to form the double container 1 '. At this time, the brazing material 7A is
Since the solid brazing filler metal thinner than the height of the guide wall of the recess 4 is used, the brazing filler metal 7A does not fall out of the recess 4. Accordingly, the locking wall portion 6b of the sealing member 6A is similarly restricted in movement by the guide wall, and is prevented from easily falling off. As a result, workability can be improved.

In the assembled state of the double container 1 ',
As shown in FIG. 2 (B), the movement of the sealing member 6A in the vertical direction is restricted via the brazing material 7A between the bottom of the recess 4 and the bottom 3a of the inner bottle 3, and the movement in the horizontal direction. Is regulated by the guide wall of the concave portion 4, so that there is no displacement from the attached state. Therefore, even if an external impact or the like is applied in this state, it is possible to reliably prevent the brazing material 7A and the sealing member 6A from being separated from the predetermined mounting positions.

After that, the double container 1'is placed in a well-known heating furnace or the like, and as shown in FIG. 2 (A), it is attached to the surface of the double container 1'by a local exhaust type exhaust device 10. The space S between the outer bottle 2 and the inner bottle 3 is evacuated while removing oil, water and the like and the gas occluded in the metal forming the outer bottle 2 and the inner bottle 3. In addition, you may exhaust with a vacuum heating furnace.

Specifically, first, the mouth of the double container 1'is erected with the mouth thereof facing upward, and the exhaust jig 11 of the exhaust device 10 is installed so that the exhaust opening 11a is the exhaust hole 5 of the outer bottle 2. Place it to cover. As a result, the bottom plate 2a of the outer bottle 2 is held airtight by the seal member 12 attached to the exhaust port 11a.

The inner bottle 3 is heated by a heating means (not shown).
The space S is exhausted through the exhaust hole 5 and the ventilation portion 8 of the brazing material 7A while heating the inner surface of the space at about 450 ° C. As a result, the inside of the space S is exhausted while removing the adhering substances such as oil and water adhering to the outer bottle 2 and the inner bottle 3 and the stored gas. At this time, since the exhaust hole 5 has a diameter larger than that of the conventional exhaust hole by 1.5 mm or more, the exhaust hole 5 can be efficiently exhausted. Since the heat of the inner bottle 3 also affects the portion where the brazing filler metal 7A is arranged via the heat conduction of the outer bottle 2 or the like, a temperature (a In the embodiment, the temperature is maintained at 200 ° C. or lower). Further, the oil, the water, and the occluded gas are pre-heated in a state before the double container 1 ′ is arranged in the exhaust device 10 or in a state before the double container 1 ′ is assembled. You may keep it.

Then, when the space S of the double container 1'has reached a predetermined vacuum degree by the exhaust operation, the induction heating coil 14 wound around the ferrite core 13 is caused to pass through the inductance adjusting coil 16 from the control device 15. 20 ~
A high frequency current of 50 kHz is applied. Thereby, the electromagnetic wave from the induction heating coil 14 passes through the exhaust jig 11, and the sealing member 6 having magnetism by the electromagnetic induction effect.
A heats up, and the heat melts the brazing material 7A located under the sealing member 6A.

As a result, all the brazing filler metal 7A melts and the vent portion 8 disappears, and the sealing member 6A descends by its own weight, and the sealing member 6A is fixed on the brazing filler metal 7A in the recess 4, The exhaust hole 5 is reliably sealed by the sealing member 6A. In this sealed state, a complete gap is formed between the upper end portion of the sealing member 6A and the bottom portion 3a of the inner bottle 3, and this gap allows the heat applied to the inner bottle 3 to be removed during actual use. There is no direct heat transfer to the bottle 2. In addition, when the space S is evacuated, this gap is formed in the outer bottle 2 and the inner bottle 3.
It is necessary to set it larger than the amount of displacement of the space side.

As described above, according to the first embodiment,
Only by arranging the brazing material 7A and the sealing member 6A in the recess 4 of the bottom plate 2a, it is possible to reliably prevent them from moving and coming off in the assembled state of the double container 1 '. as a result,
The workability in assembling can be improved, and by melting the brazing material 7A, the exhaust hole 5 can be reliably sealed by the sealing member 6A as described above.

(Second Embodiment) FIG. 4A shows a thermos bottle 1 manufactured by the sealing method of the second embodiment. This thermos bottle 1 is different from the first embodiment only in that the concave portion 4 is provided on the bottom plate 2a of the outer bottle 2 in the first embodiment, whereas it is provided on the bottom portion 3a of the inner bottle 3.

In the second embodiment, first, the brazing material 7A having the ventilation portion 8 formed thereon is brazed to the bottom plate portion 6a of the sealing member 6A with another brazing material as in the first embodiment. Stick to it. Then, the body 2b of the outer bottle 2 to which the inner bottle 3 is joined is inverted, and in this state, the sealing member 6A having the brazing material 7A fixed thereto is folded back in the recess 4'of the inner bottle 3 as shown in FIG.
Place from the c side. Then, the bottom plate 2a is arranged at the lower end opening of the body 2b of the outer bottle 2 and these are joined together.
Assemble the double container 1'shown in (B).

The brazing filler metal 7A is fixed to the bottom plate 2a so that the ventilation portion 8 remains around the exhaust hole 5 and the inner bottle 3
After the outer bottle 2 having been joined is inverted and the sealing member 6A is arranged in the recess 4'of the inner bottle 3, the bottom plate 2a may be joined to the body 2b to form the double container 1 '. The exhaust operation of the double container 1'is the same as that of the first embodiment.

(Third Embodiment) FIG. 5A shows a thermos bottle 1 manufactured by the sealing method of the third embodiment. This thermos bottle 1 is provided with the recesses 4 and 4'on either the bottom plate 2a of the outer bottle 2 or the bottom portion 3a of the inner bottle 3 in the above-described embodiments, whereas the bottom plate 2a and the inner bottle 3 of the outer bottle 2 are provided. It differs from each embodiment only in that it is provided on both bottoms 3a.

(Modifications of First to Third Embodiments) The sealing member 6A shown in the first to third embodiments is not limited to the above configuration. For example, in the sealing member 6B shown in FIG. 6 (A), the locking wall portions 6b are provided so as to project in the circumferential direction at a predetermined interval, and each locking wall portion 6b is formed.
The piece of b has elasticity. In the sealing member 6C shown in FIG. 6 (B), the bottom plate portion 6a has a rectangular shape, and an elastic locking wall portion 6b having a folded portion 6c is formed at the upper end from both end edges in the longitudinal direction. . By doing so, even if the upper ends of the locking wall portions 6b of the sealing members 6B and 6C slightly contact the bottom portion 3a of the inner bottle 3 in the assembled state of the double container 1'before vacuum evacuation. Assembling work is not inconvenient, and vertical movement does not occur, so workability is improved. Further, when the brazing material melts and the sealing member descends during sealing, even if the amount of deformation in the direction of the space S of the double container is large and the sealing members 6B and 6C contact the inner bottle 3, Since the contact area is small, it is possible to minimize the decrease in heat retention performance. In addition, the sealing member may be simply configured by a solid rod member or the like. In this case, since the sealing member itself becomes heavy, the sealing member itself is reliably weighted when the brazing material 7A is melted. Can descend and, as a result, exhaust hole 5
Can be reliably sealed.

Further, the solid type brazing material 7A is not limited to the above construction. For example, the brazing material 7B shown in FIG. 7 (A) has a wire material formed in a continuous wavy shape in an annular shape, and a ventilation part 8 is provided between adjacent curved sides. A brazing filler metal 7C shown in FIG. 7B is composed of a plurality of brazing filler metal pieces 7a arranged at a predetermined interval around the exhaust hole 5 formed in the recess 4, and the adjacent brazing filler metal pieces 7a, 7a are connected to each other. The ventilation part 8 is used.

Further, the recesses 4 and 4'formed on the bottom plate 2a of the outer bottle 2 or the bottom portion 3a of the inner bottle 3 are not limited to the above-mentioned construction. For example, in the concave portion 4 "shown in FIG. 8, the guide convex portion 4a is provided on the inner wall thereof at a predetermined interval (in the figure, 90 degrees) close to the outer peripheral portions of the sealing members 6A, 6B and 6C. The play of the sealing members 6A, 6B, 6C is suppressed by 4a. In the figure, the bottom plate 2a of the outer bottle 2 has a recess 4 ", but the inner bottle 3 Bottom 3a
The same applies to the case of forming.

(Fourth Embodiment) FIG. 9A shows a thermos bottle 1 manufactured by the sealing method of the fourth embodiment. In this thermos bottle 1, in the first to third embodiments, the ventilation member 8 is formed in the brazing material 7A (7B, 7C), whereas the ventilation member 8 ′ is formed in the sealing member 6D. It is different from each of the above-mentioned embodiments. Specifically, FIG. 9 (C),
As shown in (D), the sealing member 6D has an outer peripheral portion that does not face the exhaust hole 5 in the bottom plate portion 6a,
A ventilation part 8'is formed by recessing in an arc shape toward the side locking wall part 6b. Further, these ventilation parts 8 ′ are set such that the inner peripheral ends on the side of the bottom plate 6 a are located inside the internal space of the annular solid brazing material 7 D where the ventilation part 8 is not formed.

In the fourth embodiment, as in the first embodiment, the sealing member 6D and the solid brazing material 7D are used.
Are placed to assemble the double container 1 ′ shown in FIG. 9 (B). In the present embodiment, the brazing material 7D has a ventilation part 8
Since the brazing filler metal 7D does not need to be formed, the brazing filler metal 7D is formed in the recess 4 with the rod member having poor wetting property inserted in the exhaust hole 5.
After the brazing material 7D is melted and fixed inside, the rod member may be removed to form a hole corresponding to the exhaust hole 5.

After that, the space S of the double container 1'is evacuated through the exhaust hole 5 and the ventilation portion 8'of the sealing member 6D, and when the space S reaches a predetermined vacuum degree, about 200-.
By melting the brazing filler metal 7D by heating the double container 1 ′ at a temperature of 450 ° C., the sealing member 6D is lowered along the guide wall of the recess 4 of the outer bottle 2. At this time,
Since the bottom plate portion 6a of the sealing member 6D is provided with the ventilation portion 8 ′ so as to avoid a position facing the exhaust hole 5, the sealing member 6D descends to cause the sealing member 6D to descend.
D allows the exhaust hole 5 to be reliably sealed via the brazing material 7D.

(Fifth Embodiment) FIG. 10A shows a thermos bottle 1 manufactured by the sealing method of the fifth embodiment. In the fourth embodiment, the thermos bottle 1 is formed by recessing the ventilation part 8 ′ in an arc shape from the bottom plate part 6a to the locking wall part 6b. This is different from the fourth embodiment in that guide convex portions 6d are provided at intervals and a ventilation portion 8'is provided between them. Further, in the sealing member 6E of the present embodiment, the guide protrusion 6d (6d-1) is extended over the outer surface of the locking wall 6b, and the portion (6d-2) located on the locking wall 6b is recessed. By making sliding contact with the guide wall of No. 4, it is set so that rattling can be suppressed. Further, a convex portion 6e to be inserted into the exhaust hole 5 is provided at the center of the bottom plate portion 6a.

In the fifth embodiment, similar to the first embodiment, the sealing member 6E and the annular solid brazing material 7E are arranged to form a double container 1'shown in FIG. 10 (B). assemble. As in the case of the fourth embodiment, a rod member having poor wetting property is inserted in the exhaust hole 5 and the brazing material 7E is melted and fixed inside the recess 4 to form a hole corresponding to the exhaust hole 5. You may form so that it may have.

After that, the space S of the double container 1'is evacuated through the exhaust hole 5 and the ventilation portion 8'on the outer surface side of the sealing member 6E, and when the space S reaches a predetermined vacuum degree, The brazing filler metal 7E is melted by heating the double container 1'at a temperature of about 200 to 450 ° C. As a result, the sealing member 6E descends along the guide wall of the concave portion 4 of the outer bottle 2, and the convex portion 6e of the bottom plate portion 6a is inserted into the exhaust hole 5. At this time, in the present embodiment, the guide protrusion 6d is extended to the outer peripheral portion of the locking wall 6b to suppress rattling, so that the protrusion 6e is reliably guided into the exhaust hole 5. As a result, the space of the exhaust hole 5 has a convex portion 6 of the sealing member 6E.
Since it is substantially closed by e, the exhaust hole 5 is closed by the sealing member 6E.
It can be surely sealed.

In the fourth and fifth embodiments, the recess may be provided on the bottom 3a side of the inner bottle 3 as in the second embodiment, or as in the third embodiment. Alternatively, it may be provided on both the bottom plate 2a of the outer bottle 2 and the bottom portion 3a of the inner bottle 3. Further, the guide protrusion 4a may be provided inside the recess 4.

(Sixth Embodiment) FIG. 11A shows a thermos bottle 1 manufactured by the sealing method of the sixth embodiment. In the thermos bottle 1 of the second embodiment, a bottomed cylindrical sealing member 6B is used and a circular recess 4'is formed in the bottom 3a of the inner bottle 3, whereas a spherical sealing member is used. Using 6F,
It differs from the second embodiment in that a hemispherical recess 4'is formed in the bottom 3a of the inner bottle 3. In addition, as shown in FIG. 11C, the brazing filler metal 7F of the present embodiment has an upper surface closed and a ventilation portion 8 formed below the upper surface.

In the sixth embodiment, the sealing member 6F is used.
When arranging the brazing filler metal 7F, as in the second embodiment,
First, the sealing member 6F is fixed to the closed upper surface of the brazing material 7F. Then, the body 2b of the outer bottle 2 to which the inner bottle 3 is joined is inverted, and in this state, the sealing member 6F is arranged in the recess 4'of the inner bottle 3 so that the brazing material 7F is located above.

Then, the bottom plate 2a is placed in the opening of the body 2b of the outer bottle 2 and joined together, and the double container 1'shown in FIG. 4 (B) is assembled to form the space of the double container 1 '. After evacuating S and causing the space S to reach a predetermined vacuum degree, about 200
Heat the double vessel 1'at a temperature of ~ 450 ° C. As a result, the brazing material 7F is melted, and the sealing member 6
F is lowered, and the exhaust hole 5 is sealed by the sealing member 6F.

(Modification of Sixth Embodiment) The sixth embodiment
In the embodiment, the sealing member 6F and the brazing material 7F are connected to the inner bottle 3
Although they are fixed to each other when they are arranged in the concave portion 4 ′, they are not necessarily fixed. In this case,
As shown in FIG. 2 (C), an annular brazing material 7F ′ having a ventilation part 8 formed in the lower part is used. In addition, FIG. 12 (A), (B)
As shown in Fig. 3, the bottom plate 2a of the outer bottle 2 has a brazing material 7F.
The concave portion 4 is provided for positioning. The recess 4 formed in the bottom plate 2a may be circular as shown in the drawing,
Further, it may be hemispherical as in the inner bottle 2 side.

The method for sealing the vacuum double structure of the present invention is not limited to the above construction. For example, the sealing members 6A to 6D shown in the first to fourth embodiments.
On the other hand, the convex portion 6e formed on the sealing member 6E shown in the fifth embodiment may be provided, and in this case, the exhaust hole 5 can be surely sealed as in the fifth embodiment. Further, in the present embodiment, the exhaust hole 5 has the outer bottle 2 (first component member).
Although it is formed on the bottom plate 2a, it may be formed on the body 2b.

Further, the guide walls of the sealing members 6A to 6D are provided with the concave portions 4, 4 ', of the first constituent member or the second constituent member.
The outer bottle 2 or the inner bottle 3 is provided so as to be positioned on the outer peripheral portion of the sealing member (the sealing member 6A in the figure) as shown in FIG. 13 (A). The plate-shaped guide wall 20 may be provided in a protruding manner, or the guide wall 20 ′ may be provided in a protruding manner by joining another plate member by welding or the like, as shown in FIG. Furthermore, the vacuum double structure using the above sealing method is not limited to the thermos bottle 1, and the same action and effect can be obtained even when applied to a vacuum double tube, a vacuum heat insulating panel, or the like.

[0046]

As is apparent from the above description, in the vacuum double structure sealing method of the present invention, the brazing material is positioned around the exhaust hole of the first component, and A sealing member is provided between the second component member and the guide member in the state before sealing the sealing member to restrict movement in the horizontal direction and the vertical direction to prevent the positional displacement. Therefore, workability such as handling can be improved. Specifically, as a means for restricting the movement of the sealing member, a recess is provided in the first constituent member or the second constituent member, and the solid brazing material and the sealing member are arranged in the recess, and each constituent member is arranged. As described above, the movement of the brazing material and the sealing member can be regulated only by assembling, so that the workability in assembling can be improved.

When the exhaust hole is sealed, the brazing material is melted so that the sealing member is guided by the recesses of the first component member or the second component member, or is guided by both recesses. As a result, the exhaust hole is reliably lowered by its own weight and the exhaust hole is sealed by the sealing member via the brazing material, so that the sealing is highly reliable and the stable quality of the product can be secured. Further, since the exhaust hole is sealed by the sealing member, the diameter of the exhaust hole can be increased, and as a result, the exhaust efficiency can be improved.

[Brief description of drawings]

FIG. 1 is a partial sectional view showing a thermos bottle manufactured by a sealing method according to a first embodiment of the present invention.

2A is a cross-sectional view showing a state of the double container before sealing, and FIG. 2B is an enlarged cross-sectional view of a main part of FIG.

FIG. 3 is an exploded perspective view showing a recess, a brazing material, and a sealing member.

4A is a cross-sectional view of a thermos bottle manufactured by the sealing method of the second embodiment, and FIG. 4B is a cross-sectional view showing a state of the double container before sealing in FIG.

5A is a cross-sectional view of a thermos bottle manufactured by the sealing method of the third embodiment, and FIG. 5B is a cross-sectional view showing a state of the double container before sealing in FIG.

6A and 6B are perspective views showing modified examples of the sealing member in the first to third embodiments.

7A and 7B are perspective views showing modified examples of the brazing filler metal according to the first to third embodiments.

FIG. 8 is a perspective view showing a modified example of a recess in the first to third embodiments.

9A is a sectional view of a thermos bottle manufactured by the sealing method of the fourth embodiment, FIG. 9B is a sectional view showing a state of a double container before sealing of FIG. 9A, and FIG. FIG. 3B is an enlarged view of a main part of FIG. 3B, and FIG. 3D is a cross-sectional view of the main part of FIG.

10A is a cross-sectional view of a thermos manufactured by the sealing method of the fifth embodiment, FIG. 10B is a cross-sectional view showing a state of a double container before sealing in FIG. 10A, and FIG. The perspective view of a sealing member, (D) is sectional drawing which cut | disconnected (C) by the AA line part.

11A is a cross-sectional view of a thermos bottle manufactured by the sealing method according to the sixth embodiment, FIG. 11B is a cross-sectional view showing the state of the double container before sealing in FIG. 11A, and FIG. It is a perspective view which shows the brazing material of (B).

12A is a cross-sectional view of a thermos bottle manufactured by a modification of the sealing method of the sixth embodiment, FIG. 12B is a cross-sectional view showing the state of the double container before sealing in FIG. (C) is a perspective view showing the brazing material of (B).

13 (A) and 13 (B) are cross-sectional views showing a modified example of the guide wall that regulates the sealing member.

[Explanation of symbols]

1 ... Thermos bottle, 2 ... Outer bottle (first component member), 2a ... Bottom plate,
2b ... body, 3 ... inner bottle (second component member), 3a ... bottom,
4, 4 '... concave part, 4a ... guide convex part, 5 ... exhaust hole, 6A
6F ... Sealing member, 6a ... Bottom plate part, 6b ... Locking wall part, 6
c ... folding part, 6d ... guide convex part, 6e ... convex part, 7A to 7
F ... brazing material, 8, 8 '... ventilation part, S ... space.

─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Mamoru Fujiyama 1-20-5 Tenma, Kita-ku, Osaka City, Osaka Prefecture Zojirushi Mahobin Co., Ltd. (72) Toyohiko Takatsuki 1-20, Tenma, Kita-ku, Osaka City, Osaka Prefecture No. 5 within Zojirushi Mahobin Co., Ltd. (56) Reference JP-A-2-189116 (JP, A) JP-A-1-317413 (JP, A) JP-A-60-222017 (JP, A) JP-A-58- 124415 (JP, A) Actual Kaihei 1-59542 (JP, U) (58) Fields surveyed (Int.Cl. ⁷ , DB name) A47J 41/02 102

Claims (16)

(57) [Claims] 1. A vacuum double structure in which a space formed by a constituent member is exhausted from an exhaust hole formed in the constituent member, and then the exhaust hole is sealed from the space side by a sealing member via a brazing material. A method of sealing a structure, wherein a ventilation part for communicating the exhaust hole and the space is provided at a position not facing the exhaust hole of the brazing material or the sealing member,
A guide wall for holding a side portion of the sealing member is provided on the space side of at least one of the first component member having the exhaust hole and the second component member facing the first component member, and the first configuration is provided. The brazing material is positioned around the exhaust hole on the space side of the member, and the brazing material and the second
The sealing member is disposed between the component member, the horizontal movement of the sealing member is restricted by the guide wall, and the vertical movement is between the first component member and the second component member. After the brazing material is regulated and the space is evacuated through the exhaust hole and the ventilation part, the brazing material is melted to lower the sealing member and the sealing member seals the exhaust hole. A method for sealing a vacuum double structure, which comprises stopping. 2. The guide wall is formed by an inner wall of a recess provided in the first component member so as to project outward from the space side, and a lower portion of the sealing member is disposed in the recess. The method for sealing a vacuum double structure according to claim 1, wherein movement of the sealing member is restricted. 3. The guide wall comprises an inner wall of a recess provided in the second component member so as to project outward from the space side, and by disposing the upper portion of the sealing member in the recess. The method for sealing a vacuum double structure according to claim 1, wherein movement of the sealing member is restricted. 4. The vacuum double structure according to any one of claims 1 to 3, wherein the guide wall is provided with a guide convex portion that is close to an outer peripheral portion of the sealing member. Body sealing method. 5. The method for sealing a vacuum double structure according to claim 1, wherein the brazing material is an integrally molded annular solid brazing material. . 6. The sealing member integrated with the brazing material is disposed on the first constituent member or the second constituent member by fixing the solid brazing material to the sealing member. Item 6. A method for sealing a vacuum double structure according to item 5. 7. The vacuum double structure according to claim 5, wherein the ventilation part is formed by a groove provided between an inner peripheral edge and an outer peripheral edge of the annular solid brazing material. Body sealing method. 8. The brazing material is the first constituent member or the second constituent member.
The method for sealing a vacuum double structure according to any one of claims 1 to 4, wherein the method is melted and fixed to a constituent member. 9. The ventilation part is formed by melting and fixing the brazing filler metal into pieces in a circumferential direction at predetermined intervals.
9. The vacuum double structure sealing method according to claim 8, wherein the vacuum double structure is formed by a space between adjacent brazing materials. 10. The sealing member includes a bottom plate portion facing the exhaust hole, and a locking wall portion extending from at least a part of an outer edge portion of the bottom plate portion to the second component member side. The method for sealing a vacuum double structure according to any one of claims 1 to 9. 11. The method for sealing a vacuum double structure according to claim 10, wherein a folding portion is provided at an upper end portion of the locking wall portion of the sealing member. 12. The bottom plate portion of the sealing member is provided with a convex portion that is inserted into the exhaust hole when the sealing member descends. Method for sealing a vacuum double structure of. 13. The vacuum double structure according to claim 10, wherein the ventilation portion is formed so as to be recessed from the bottom plate portion to the locking wall portion. Sealing method. 14. The ventilation part is provided with a plurality of guide protrusions on the bottom plate portion, and is constituted by a space between the adjacent guide protrusions. The method for sealing a vacuum double structure according to item 1. 15. The guide convex portion is extended to an outer surface of the locking wall portion, and the guide convex portion on the locking wall portion side restricts the horizontal movement of the sealing member. The method for sealing a vacuum double structure according to claim 14. 16. The vacuum double structure according to claim 1, wherein the first component is a member forming a bottom plate of the vacuum double structure. Sealing method.