JPH1147005A - Method for sealing vacuum double structural body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve workability and to assure stable quality by surely sealing a discharge hole. SOLUTION: This method for sealing a vacuum double structural body consists in evacuating a space S formed of component members from a discharge hole 5 formed at the component member, then sealing this discharge hole by a sealing member. In such a case, a brazing filler metal 7 is fixed and disposed at the circumference of the discharge hole 5 on the space S side of the first component member (a bottom plate 3 of an outside bottle 2) formed with the discharge hole 5 and the sealing member 6 is positioned and held so as to face the discharge hole 5 on the space S side of the second component member (inside bottle 4) facing the first component member and is so arranged that the discharge hole 5 faces downward. When a prescribed vacuum degrees attained by evacuating the space, the sealing member is heated to the m. p. of the brazing filler metal or above and is dropped, by which the brazing filler metal is melted. The discharge hole 5 is thus sealed by the sealing member 6 via the brazing filler metal.

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 or a vacuum double tube.

[0002]

2. Description of the Related Art Conventionally, as a method of sealing a vacuum double structure, for example, a thermos bottle comprising an inner bottle and an outer bottle made of metal, Japanese Patent Publication No. 61-1136 discloses a method of sealing an exhaust hole using a sealing member. A method for sealing is provided. In this method, an exhaust hole is provided in the bottom plate of the outer bottle, a brazing material is disposed around the exhaust hole of the bottom plate on the space side between the inner bottle and the outer bottle, and a sealing material is placed on the brazing material. A stop member is supported, and after assembling the inner bottle and the outer bottle to form a double container, by disposing the double container in a vacuum furnace, the space between the inner bottle and the outer bottle is reduced. Exhaust through the exhaust hole. Thereafter, the inside of the vacuum furnace is heated to melt the brazing material, so that the sealing member is dropped onto the exhaust hole, and the exhaust hole is sealed.

[0003]

However, in the above-mentioned sealing method, there is no means for positioning and holding the brazing material and the sealing member, and the brazing material and the sealing member are in a space between the inner bottle and the outer bottle. Once assembled as a double container, it is not possible to visually confirm the arrangement of these components, and the brazing material and the sealing member may be removed while the double container is formed. If the bottle comes off from the bottom plate of the bottle or if the bottle is misaligned, poor sealing may occur, and the reliability is lacking. Therefore, with the double container assembled,
Workability was also unfavorable because the brazing material and the sealing member had to be handled carefully so as not to come off from the mounting position.

Accordingly, 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 an exhaust hole to ensure stable quality. .

[0005]

In order to solve the above-mentioned problems, in a method for sealing a vacuum double structure according to the present invention, a space formed by a constituent member is evacuated from an exhaust hole formed in the constituent member. Thereafter, a method of sealing a vacuum double structure in which the exhaust hole is sealed with a sealing member, wherein a brazing material is fixed around the exhaust hole on the space side of the first component member having the exhaust hole. The sealing member is positioned and held on the space side of the second component member facing the first component member so as to face the exhaust hole, and the exhaust hole is positioned below. And the space is evacuated, and when a predetermined degree of vacuum is reached, the sealing member is heated to a temperature equal to or higher than the melting point of the brazing material and dropped so that the brazing material is melted and the exhaust hole is passed through the brazing material. Sealing with a sealing member.

According to the method for sealing a vacuum double structure,
The brazing material and the sealing member are arranged on the space side formed by the constituent members. However, the brazing material is fixedly arranged on the first constituent member, and the sealing member is disposed in the first position. Since the positioning and holding are performed with respect to the two constituent members, in a state where the two members are assembled as a double structure before evacuation,
Even if an impact or the like is applied from the outside, it is possible to prevent the brazing material and the sealing member from separating from the constituent members. Further, when the space reaches a predetermined vacuum degree, the exhaust hole heats the sealing member to a temperature equal to or higher than the melting point of the brazing material and drops the sealing member. Since the sealing member is placed on the sealing member, as a result, the exhaust hole is securely sealed by the sealing member via the brazing material, so that occurrence of a product defect can be suppressed.

In the method for sealing a vacuum double structure, it is preferable that the sealing member is positioned and held on the second component by a bonding material that melts at a temperature of about 200 ° C. to 500 ° C.

In this case, it is preferable to use a brazing material as the joining material. Further, the joining material may be formed in a rivet shape, an attachment member may be provided on the second component, and the attachment member and the sealing member may be fixed by penetrating the rivet-like joining material.

Further, the sealing member is formed of a magnetic material, and about 20 mm is provided on the space side of the second component member.
By fixing a magnetic material having a Curie temperature of 0 ° C. to 500 ° C., the sealing member may be positioned and held on the second component via the magnetic material.

Alternatively, the sealing member is heated at a temperature of about 200 ° C. to 5 ° C.
The sealing member may be positioned and held on the second component via the magnetic material by fixing the second component to a magnetic material having a Curie temperature of 00 ° C. and forming the second component from a magnetic material.

Alternatively, the sealing member is formed of a magnetic material, and about 200
By disposing a magnetic material having a Curie temperature of 500 ° C. to 500 ° C., the sealing member is moved to the second position by the magnetic force of the magnetic material.
The positioning member may be positioned and held.

Alternatively, the sealing member may be formed of a magnetic material and the second component member may be formed of a magnetic material so that the sealing member is positioned and held on the second component member.

Alternatively, the sealing member is positioned on the second component by a holding member for movably inserting the sealing member from the exhaust hole of the first component into the space, and an elevating means for raising and lowering the holding member. May be retained.

In this case, it is preferable that the sealing member and the holding member are detachably attached to each other, and after the exhaust hole is sealed, the sealing member and the holding member are detached. Or,
The sealing member and the holding member may be formed integrally. In this case, it is preferable to cut off a portion protruding from the exhaust hole as needed.

It is preferable that the elevating means comprises an elevating member having magnetism and to which the holding member is detachably attached, and an electromagnet which forms a magnetic field by applying a current to elevate the elevating member. . Alternatively, the elevating means may include an exhaust device, an elevating member that is housed in the exhaust device in an airtight state, and that detachably attaches the holding member to an upper end protruding from the exhaust device toward the vacuum double structure, A rotating body rotatably screwed to an exhaust device and connected to a lower end of the elevating member may be moved up and down by rotating the rotating body.

Alternatively, the sealing member may be made of a brazing material, and the brazing material may be positioned and held by joining the brazing material to the second component.

When the sealing member is not made of a brazing material, it is preferable that the surface of the sealing member is subjected to metal plating for improving wettability. In each of the methods, it is preferable that the first component is cooled to prevent the brazing material disposed around the exhaust hole from melting before being sealed by the sealing member.

[0018]

Embodiments of the present invention will be described below with reference to the drawings. (First Embodiment) FIG. 1 shows a thermos bottle 1 as a vacuum double structure manufactured by a sealing method according to a first embodiment of the present invention. The thermos bottle 1 is a vacuum double container including a metal outer bottle 2 and an inner bottle 4 made of stainless steel or the like. Outer bottle 2
The inner bottle 4 is joined to the inner bottle 4 by welding or the like at the mouth, and a space S is formed between them.

The outer bottle 2 has an exhaust hole 5 formed at the center of the bottom plate 3 as a first component. The exhaust hole 5 is
Sealing is performed by fixing a sealing member 6 on a brazing material 7 fused and fixed to the bottom plate 3. The exhaust hole 5 has a diameter of about 3.5 mm or more and has a diameter such that the molten brazing material 7 flows down. Here, it is known that a conventional thermos in which the exhaust hole is sealed only with the brazing material has a maximum diameter of the exhaust hole of about 3 mm, and in the present embodiment, the diameter is set to be more than that. ing. The sealing member 6 is made of, for example, S
Metal plating such as n, Pb, Zn, Ni, and Cu is applied. Examples of the brazing material 7 include Sn, Pb, and Sn-Pb-based alloys that melt at about 200 ° C. to 450 ° C., or alloys obtained by adding Ag, Bi, Sb, or In thereto, or glass.

Next, a method of sealing the thermos bottle 1 will be described. First, before assembling the double container 1 ', FIG.
As shown in (B), the space S of the bottom plate 3 of the outer bottle 2 is formed.
A flux or the like is applied to the periphery of the exhaust hole 5 on the side, and the brazing material 7 is melted and fixed from above the flux, and then the excess flux exposed on the surface of the brazing material 7 is washed. To remove. As described above, by melting and fixing the brazing material 7, most of the occluded gas contained in the brazing material 7 can be removed. In addition, the exhaust hole 5 is not formed in the bottom plate 3, but after the brazing material 7 is provided as described above, the exhaust hole 5 is formed by penetrating the brazing material 7 and the bottom plate 3 using a drill or the like. May be. In place of the flux, S
Metal plating such as n, Pb, Sn.Pb alloy, Zn or Ni may be applied.

Next, the positioning metal brazing material 8 which melts at a temperature of about 200 ° C. to 500 ° C., preferably about 400 ° C.
Is used as a bonding material, and the sealing member 6 is brazed and positioned on the bottom 4a of the inner bottle 4 which is the second constituent member facing the bottom plate 3 in the assembled state so as to face the exhaust hole 5. Hold. The joining material may be a glass brazing material or the like instead of the metal brazing material 8, and may be a material that melts at about 200 to 500 ° C. as described above. Either the positioning of the sealing member 6 with respect to the bottom 4 a of the inner bottle 4 or the disposition of the brazing material 7 with respect to the bottom plate 3 of the outer bottle 2 may be performed first.

Next, the components 2, 3, and 4 are assembled to form a double container 1 '. That is, the inner bottle 4 is inserted from the opened bottom of the outer bottle 2 and the mouths of the outer bottle 2 and the inner bottle 4 are fixed to each other by welding or the like. The bottom plate 3 is arranged and similarly fixed by welding or the like. In addition, the bottom plate 3 may be joined to the outer bottle 2 after the sealing member 6 is positioned on the bottom 4a of the inner bottle 4 in a state where the outer bottle 2 and the inner bottle 4 are joined.

As described above, in the double container 1 ', the brazing material 7 is disposed on the bottom plate 3 by melting and fixing, and the sealing member 6 is provided with the positioning metal brazing material 8 on the inner bottle 4.
Therefore, even if an impact or the like is applied from the outside in this state, the brazing material 7 and the sealing member 6 do not easily come off.

Next, the double container 1 ′ is
(A) is disposed in the local exhaust type exhaust device 10 to remove oil and moisture and the like adhering to the surface of the double container 1 ′ and gas absorbed in the metal forming the inner bottle 4 of the outer bottle 2. While
The space S between the outer bottle 2 and the inner bottle 4 is evacuated. In addition,
Needless to say, the gas may be exhausted by a well-known vacuum heating furnace.

Here, the exhaust device 10 includes a furnace body 11
And a pallet 12 for arranging double containers 1 '.
The furnace main body 11 is provided with a heating means 13 such as a hot air heater, and the ejection nozzle 14 is arranged so as to penetrate the upper wall of the furnace main body 11 and be inserted into the inner bottle 4 of the double container 1 ′. ing. As shown in FIGS. 3A and 3B, the arrangement pallet 12 is provided with an exhaust pipe 15 and a cooling pipe 16 therein. The exhaust pipe 15 is an exhaust means. The exhaust pipe 15 branches toward the arrangement portion 12a of the double container 1 'formed on the arrangement pallet 12, and a local exhaust cylinder 17 is provided at the end thereof. A seal member 18 for hermetically sealing the space between the outer bottle 2 and the bottom plate 3 is provided at the upper end opening of the cylindrical body 17.
The space between the inner bottle 4 and the inner bottle 4 is evacuated. The cooling pipe 16 is a cooling means, and
The bottom plate 3 of the outer bottle 2 is sequentially piped so as to swing substantially annularly so as to be substantially in contact with the bottom plate 3 of the outer bottle 2 of the double container 1 ′. Have been able to cool down. Note that air may be supplied to the cooling pipe 16 and air may be directly injected to the bottom plate 3 of the outer bottle 2 for cooling by an air cooling method.

When the double container 1 'is evacuated using the exhaust device 10, the double container 1' is first placed on the disposing portion 12 of the disposing pallet 12 so that the opening thereof faces upward.
a, and the bottom plate 3 of the outer bottle 2 is airtightly held by the seal member 18.

Next, the heating means 13, the pump 19 of the exhaust means and the water supply pump 20 of the cooling means are operated. As a result, warm air is blown into the inner bottle 4 of the double container 1 'from the heating means 13 through the jet nozzle 14 so that the high melting metal brazing material 8 for positioning does not melt. Including the material 8 and the sealing member 6, the inner bottle 4 is heated and the outer bottle 2 is heated by hot air leaking from the mouth of the inner bottle 4.

Then, by the heating by the heating means 13,
The components 2, 3, and 4 are heated to discharge oil, moisture, etc., and occluded gas attached to the surface when assembling the double container 1 '. In addition, by the exhaust operation by the exhaust means, not only the air in the space S between the outer bottle 2 and the inner bottle 4 but also oil, moisture, etc. and the occluded gas generated in the space S are exhausted by the exhaust holes 5.
Forcibly exhaust air to the outside.

At this time, the bottom plate 3 of the outer bottle 2 is heated by the heat from the heating means 13 to increase the temperature by heat transfer. In the present embodiment, the operation of the cooling means removes the heat transferred to the bottom plate 3. As a result, the low melting point brazing material 7 is maintained at a temperature at which it does not melt. Therefore, it is possible to prevent the brazing material 7 from melting and flowing down from the exhaust hole 5. Also, the operation of the cooling means can protect the seal member 18 of the exhaust means from heat. Further, the exhaust operation by the exhaust means can be performed efficiently because the exhaust hole 5 having a large diameter is formed in the bottom plate 3.

Next, when the space S of the double container 1 'reaches a predetermined degree of vacuum, the heating temperature of the heating means 13 is reduced to about the temperature at which the positioning metal brazing material 8 positioning the sealing member 6 melts. 200 ° C. to 500 ° C. (for example, about 400
° C), and the sealing member 6 is
After securing the temperature above the melting point of the brazing material 7 provided above,
By melting the brazing material 8, the sealing member 6 positioned on the inner bottle 4 is dropped onto the brazing material 7 provided around the exhaust hole 5. As a result, the brazing material 7 is
The exhaust hole 5 is sealed by the sealing member 6 by melting the sealing member 6 and the bottom plate 3 in an airtight manner.

As described above, according to the sealing method of the present invention, the sealing member 6 for sealing the exhaust hole 5 and the brazing material 7 for hermetically fixing the sealing member 6 are combined with the outer bottle 2. Although it is configured to be disposed on the space S side between the inner bottle 4 and the sealing member 6 and the brazing material 7 as described above, the sealing member 6 and the brazing material 7 can be reliably positioned. Since it can be reliably dropped on the exhaust hole 5, the exhaust hole 5
Can be reliably sealed. In addition, the exhaust hole 5
Is not sealed by the brazing material 7, but by a sealing member 6
Therefore, the amount of the brazing material 7 used may be very small. Therefore, the gas stored in the brazing material 7
It is possible to prevent the degree of vacuum in the space S between the outer bottle 2 and the inner bottle 4 from decreasing.

(Second Embodiment) FIG. 4A shows a thermos bottle 1 manufactured by the sealing method of the second embodiment. This method for sealing the thermos bottle 1 is similar to the method for positioning and holding the sealing member 6 in the inner bottle 4 in place of the positioning brazing material 8 of the first embodiment, as shown in FIGS. As shown,
It differs from the first embodiment in that a rivet-shaped joining material 23 that melts at a temperature of about 200 ° C. to 500 ° C. is used.

More specifically, an L-shaped mounting member 22 is joined to the bottom 4a of the inner bottle 4 as the second component by welding or the like. Thereafter, the sealing member 6 is arranged below the lower end mounting piece 22a of the mounting member 22, and is fixed by being penetrated by the bonding material 23 as shown in FIG.

Thereafter, as shown in FIG. 4 (B), the double container 1 'is assembled and the space S
The inner bottle 4 is heated at a temperature equal to or higher than the melting temperature of the rivet-like joining material 23 after a predetermined degree of vacuum is reached, and the sealing member 6 is heated to a temperature equal to or higher than the melting point of the brazing material 7 on the exhaust hole 5. At the same time, the bonding material 23 is melted, and the sealing member 6 is dropped onto the exhaust hole 5. Thereby, the exhaust hole 5 is sealed by the sealing member 6 via the brazing material 7, and the thermos bottle 1 shown in FIG. 4A is formed.

(Third Embodiment) FIG. 5A shows a thermos bottle 1 manufactured by the sealing method of the third embodiment. As shown in FIG. 5B, the sealing method of the thermos bottle 1 is replaced with the positioning metal brazing material 8 and the bonding material 23 which are the positioning means of the sealing member 6 shown in the first and second embodiments. The difference is that the magnetic material 25 is used.

The magnetic material 25 is heated from about 200.degree.
It has a Curie temperature of ° C. Here, the Curie temperature refers to a temperature at which magnetism is transformed. In the present embodiment, the magnetic force is lost when the temperature is increased from about 200 ° C. to 500 ° C., and when the temperature is lowered to a temperature lower than 200 ° C., the magnetic force is reduced. It will return. In this embodiment, the magnetic material 25 having a Curie temperature of about 400 ° C. is used. Also,
The sealing member 6 used in this embodiment is made of a magnetic material, and its surface is plated with a metal having good wettability similarly to the first embodiment.

In the third embodiment, the sealing member 6 is
When positioning the inner bottle 4 as a constituent member, first, the magnetic material 25 is bonded to the bottom 4a of the inner bottle 4 with an adhesive or the like. After that, by disposing the sealing member 6 on the magnetic material 25, the sealing member 6 is attracted by the magnetic force of the magnetic material 25.

Thereafter, as shown in FIG. 5B, the double container 1 'is assembled, the space S is evacuated, and the inner bottle 4 is heated at a temperature of about 400.degree. The magnetic force of the magnetic material 25 is lost, and the sealing member 6 is dropped onto the exhaust hole 5 with a temperature higher than the melting point of the brazing material 7 on the exhaust hole 5 secured. Thus, the exhaust hole 5 is sealed by the sealing member 6 via the brazing material 7, and the thermos bottle 1 shown in FIG. 5A is formed.

(Fourth Embodiment) FIG. 6A shows a thermos bottle 1 manufactured by the sealing method of the fourth embodiment. In the method of sealing the thermos bottle 1, in the third embodiment, the sealing member 6 is adsorbed to the magnetic material 25 fixed to the bottom 4a of the inner bottle 4, as shown in FIG. The third embodiment differs from the third embodiment only in that the sealing member 6 to which the magnetic material 25 is fixed is adsorbed to the bottom 4a of the inner bottle 4. That is, in the fourth embodiment, the inner bottle 4 is formed of a magnetic material, and the sealing member 6 is formed of a predetermined metal material.

In the fourth embodiment, the sealing member 6 is
When positioning on the inner bottle 4 as a constituent member, first, the magnetic material 25 is bonded to the sealing member 6 with an adhesive or the like. Thereafter, the sealing member 6 to which the magnetic material 25 has been bonded is attached.
Is disposed in the bottom 4 a of the inner bottle 4 at a position facing the exhaust hole 5 of the bottom plate 3, so that the sealing member 6 is attracted to the inner bottle 4 by the magnetic force of the magnetic material 25.

Thereafter, as shown in FIG. 6B, the double container 1 'is assembled, the space S is evacuated, and the inner bottle 4 is heated at a temperature of about 400.degree. The magnetic force of the magnetic material 25 is lost, and the sealing member 6 is dropped onto the exhaust hole 5 together with the magnetic material 25. As a result, FIG.
As shown in (2), with the magnetic material 25 fixed to the upper part of the sealing member 6, the exhaust hole 5 is sealed by the sealing member 6 via the brazing material 7, and the thermos 1 is formed.

(Fifth Embodiment) FIG. 7A shows a thermos bottle 1 manufactured by the sealing method of the fifth embodiment. In the third embodiment, the sealing method of the thermos 1
5 is arranged on the space S side, as shown in FIG. 7B, the bottom 4 of the inner bottle 4 which is the outer surface side of the second component member.
The third embodiment is different from the third embodiment in that a magnetic material 25 is provided on the inner surface of a. That is, the sealing member 6 is formed of a magnetic material, and the inner bottle 4 is formed of a metal that does not prevent the magnetic force of the magnetic material 25 from being transmitted to the sealing member 6.

In the fifth embodiment, the sealing member 6 is
When positioning the magnetic material 25 on the inner bottle 4 as a constituent member, first, the magnetic material 25 is placed on the bottom plate 3 on the inner surface side of the bottom 4a of the inner bottle 4.
Is bonded to the position facing the exhaust hole 5 with an adhesive or the like. Thereafter, the sealing member 6 is disposed at a position facing the exhaust hole 5 of the bottom plate 3, so that the sealing member 6 is attracted to the inner bottle 4 by the magnetic force of the magnetic material 25 via the bottom 4 a of the inner bottle 4. Let it. The inner bottle 4 is also formed of a magnetic material,
The magnetic material 25 may be disposed on the bottom 4a of the inner bottle 4 by its magnetic force.

Thereafter, as shown in FIG. 7B, the double container 1 'is assembled, the space S is evacuated, and the inner bottle 4 is heated at a temperature of about 400.degree. As a result, the magnetic force of the magnetic material 25 is lost, and the sealing member 6 is dropped onto the exhaust hole 5. Thus, the exhaust hole 5 is sealed by the sealing member 6 via the brazing material 7, and the thermos 1 shown in FIG. 7A is formed. In the fifth embodiment, the magnetic material 25 disposed in the inner bottle 4 is collected and used for sealing another thermos bottle 1. As described above, since the magnetic material 25 can be reused, the cost can be reduced. The magnetic material 25 may be provided at the tip of an insertion jig (not shown) so that it can be detachably mounted inside the inner bottle 4.

(Sixth Embodiment) FIG. 8A shows a thermos bottle 1 manufactured by the sealing method of the sixth embodiment. In the method for sealing the thermos bottle 1 in the third to fifth embodiments, the sealing member 6 is separated from the inner bottle 4 by a separate magnetic material 25.
8B, the sealing member 6 is formed of a magnetic material having a Curie temperature of about 200 ° C. to 500 ° C., as shown in FIG. 8B. . The surface of the sealing member 6 is plated with metal having good wettability, and the inner bottle 4 as the second component is formed of a magnetic material.

In the sixth embodiment, the thermos 1 is
When the sealing member 6 is positioned in the inner bottle 4, the sealing member 6 is disposed at a position facing the exhaust hole 5 of the bottom plate 3 at the bottom 4 a of the inner bottle 4, so that the magnetic force of the sealing member 6 itself is obtained. Adsorb. As described above, since the sealing member 6 can be attracted by its own magnetic force only by arranging the sealing member 6 at the predetermined attachment position, workability can be improved.

Thereafter, as shown in FIG. 8B, the double container 1 'is assembled, the space S is evacuated, and the inner bottle 4 is heated at a temperature of about 400 ° C. after a predetermined degree of vacuum is reached. As a result, the magnetic force of the sealing member 6 is lost, and the sealing member 6 is dropped onto the exhaust hole 5. As a result, the exhaust hole 5 is sealed by the sealing member 6 via the brazing material 7, and the thermos 1 shown in FIG. 8A is formed.

(Seventh Embodiment) FIG. 9A shows a thermos bottle 1 manufactured by the sealing method of the seventh embodiment. In the first to sixth embodiments, the method for sealing the thermos 1 is as follows.
As a means for positioning and holding the sealing member 6 on the bottom 4a of the inner bottle 4, the physical properties of the brazing material 8, the bonding material 23, the magnetic material 25, and the like are used, but as shown in FIG. The difference is that the stop member 6 is moved up and down mechanically to be positioned and held.

More specifically, FIGS. 10 (A), (B),
As shown in (C), an exhaust device 30 including an exhaust jig 31 connected to a suction pump (not shown) is provided, and a holding means 32 is provided at a position of the exhaust jig 31 facing the exhaust hole 5. . The holding means 32 is of a so-called magnet type including a holding member 33, an elevating member 34 as a means for elevating and lowering the holding member 33, and an electromagnet 35. In the exhaust device 30, a cooling pipe 16 as a cooling means is provided on the outer peripheral portion of the exhaust jig 31.

The exhaust jig 31 has a concave portion 37 at a position facing the exhaust hole 5 for mounting the elevating member 34 so as to be able to move up and down. In addition, a seal member 38 is provided at an open upper end edge of the exhaust jig 31. The holding member 33 is a rod-shaped member having a diameter smaller than the inner diameter of the exhaust hole 5 formed in the bottom plate 3 of the outer bottle 2. The lifting member 34
Is made of a permanent magnet and is formed in a concave shape in cross section so that the lower end of the holding member 33 is detachably inserted. The lower end is magnetized to, for example, an N pole. Further, a spring 39 is disposed inside the elevating member 34. The electromagnet 35 is disposed on the outer periphery of the concave portion 37 and generates a magnetic field by applying a current so that, for example, the upper end is an S pole and the lower end is an N pole.

Next, a method of sealing the thermos bottle 1 will be described. First, similarly to the first embodiment, the brazing material 7 is placed around the exhaust hole 5 on the space S side of the bottom plate 3 of the outer bottle 2.
Is arranged. Further, the sealing member 6 is joined to one end of the holding member 33 using a brazing material as an attachment means. In addition,
It may be joined by an adhesive instead of the brazing material.

When assembling the components 2, 3 and 4, first, the inner bottle 4 is inserted from the opened bottom of the outer bottle 2, and the mouths of the outer bottle 2 and the inner bottle 4 are connected to each other. It is fixed by welding or the like. Then, the holding member 33 is inserted into the exhaust hole 5 so that the sealing member 6 is located on the side of the brazing material 7 disposed in the exhaust hole 5 of the bottom plate 3. The bottom plate 3 is arranged at the bottom opening of the container and fixed similarly by welding or the like to form a double container 1 'shown in FIG. 9B.

The double container 1 ′ is joined by melting and fixing the brazing material 7 to the bottom plate 3 of the outer bottle 2, and a holding member 33 is formed from the exhaust hole 5 of the bottom plate 3. It protrudes movably. Therefore, the sealing member 6 joined to the holding member 33 is not completely fixed, but does not shift from a predetermined disposition position.

Next, the double container 1 'is connected to the exhaust device 3
Place at 0. That is, as shown in FIG. 10 (A), first, the double container 1 ′ is erected so that the mouth thereof faces upward, and the holding member 33 projecting from the exhaust hole 5 is attached to the exhaust jig 31. The double container 1 ′ is arranged so as to be inserted into the elevating member 34. As a result, the exhaust hole 5 of the bottom plate 3 is covered with the seal member 38 constituting the exhaust port of the exhaust jig 31, and the bottom plate 3 of the outer bottle 2 is kept airtight.

Next, the holding means 32 is operated to position and hold the sealing member 6 on the bottom 4a side of the inner bottle 4. That is, a current is applied to the electromagnet 35, for example,
By generating a magnetic field such that the upper end of the electromagnet 35 is an S pole and the lower end is an N pole, as shown in FIG.
The elevating member 34 is repelled and raised by magnetic force. As a result, the sealing member 6 moves up together with the holding member 33, and is positioned in contact with the bottom 4a of the inner bottle 4. At this time, in this embodiment, since the spring 39 is disposed inside the elevating member 34, the positioning is performed in a stable state by the urging force of the spring 39.
Note that the spring 39 may not be provided and may be urged only by the lifting force of the lifting member 34 due to the magnetic force.

Thereafter, by operating a heating means, an exhaust means and a cooling means (not shown), the sealing member 6 is operated.
The temperature is raised to a temperature at which the brazing material joining the metal and the holding member 33 does not melt to discharge the deposits such as oil and moisture and the occluded gas on the surface of the double container 1 ′, and the space S containing these. The air inside is forcibly exhausted. Further, by allowing the cooling water of the cooling pipe 16 to flow through the cooling means, the brazing material 7 disposed on the bottom plate 3 is prevented from being melted.

Next, when the space S of the double container 1 'reaches a predetermined degree of vacuum by the exhaust means, the temperature is raised to a temperature at which the brazing material joining the sealing member 6 and the holding member 33 is melted. , So that they can be detached. In this embodiment, since the sealing member 6 can be brought into contact with the bottom portion 4a of the inner bottle 4 and positioned and held by the holding member 33 of the holding means 32, the temperature may be raised only once by the heating means.

Next, the power supply to the electromagnet 35 of the holding means 32 is stopped. As a result, the rebound of the elevating member 34 is released, and the elevating member 34 is
7, the holding member 33 and the sealing member 6 held by the elevating member 34 also fall. When the sealing member 6 falls on the brazing material 7 disposed on the bottom plate 3, the joining between the sealing member 6 and the holding member 33 is released. As shown, only the holding member 33 falls into the exhaust jig 31 together with the elevating member 34. On the other hand, the sealing member 6 melts the brazing material 7 by the absorbed heat, similarly to the above-described embodiments. Thereby, the sealing member 6 is interposed through the brazing material 7.
The exhaust hole 5 is sealed with the thermos 1 shown in FIG.
Is formed.

(Eighth Embodiment) FIG. 11 shows an exhaust device 40 for implementing the sealing method of the eighth embodiment. The thermos 1 formed by the exhaust device 40 is the same as the thermos 1 of the seventh embodiment shown in FIG. The exhaust device 40 includes:
The seventh embodiment differs from the seventh embodiment only in that a screw type holding means 41 is provided instead of the magnet type holding means 32 of the seventh embodiment.
This is different from the embodiment.

Specifically, the holding means 41 is generally
A holding member 33 similar to the seventh embodiment, an exterior body 43,
It comprises a lifting member 44 and a rotating body 45. The exterior body 4
3 has a flange portion 43a at one end thereof for fixing to the exhaust jig 31, and a screw hole 43b on a lower end closed surface. A bellows 46 for completely shutting off the vacuum side and the atmosphere side is provided inside the exterior body 43. The elevating member 44 is connected to the exhaust jig 31.
It has a rod shape smaller in diameter than the insertion hole 31a formed therein, and a coupling 47 is provided at an upper end thereof for detachably attaching the holding member 33, and a connecting portion 48 is provided at the lower end.
Is provided. The rotating body 45 includes the exterior body 43.
A screw shaft 49 screwed into a screw hole 43b of the exterior body 43 is provided at a center portion thereof, and has a substantially concave shape in cross section fitted to a lower end portion of the housing 43 and is rotated in a circumferential direction by a driving means (not shown). The screw shaft 49 is provided and the upper end of the screw shaft 49 is connected to the connecting portion 48 of the elevating member 44.

Next, a method for sealing the thermos 1 using the exhaust device 40 will be described. First, after forming the double container 1 'as in the seventh embodiment, the double container 1'
Is disposed on the exhaust jig 31 of the exhaust device 40. That is,
As shown in FIG. 11, first, the lower end of the holding member 33 projecting from the exhaust hole 5 of the double container 1 ′ is inserted into the exhaust jig 31 so as to be inserted into the coupling 47 of the elevating member 44. Place the container 1 '.

Next, the screw shaft 4 is driven by driving means.
The elevating member 44 and the sealing member 6 are raised by rotating the rotating body 45 in the direction in which the 9 enters the exterior body 43, and the sealing member 6 is brought into contact with the bottom 4 a of the inner bottle 4. Hold the positioning. In addition, similarly to the seventh embodiment,
A spring may be provided inside the coupling 47.

Thereafter, by operating a heating means and an exhaust means (not shown), the sealing member 6 and the holding member 33 are operated.
Is heated at a temperature at which the brazing filler metal that has been joined to the melting point does not melt to discharge deposits such as oil and moisture and occluded gas on the surface of the double container 1 ′, and forcibly remove air in the space S containing these. Exhaust.

When the space S reaches a predetermined degree of vacuum, the temperature of the brazing material joining the sealing member 6 and the holding member 33 is raised to a temperature at which the brazing material is melted, so that these members can be separated from each other. The lifting member 44 is lowered by rotating the rotating body 45 in the reverse direction by the means. This allows
Similarly to the seventh embodiment, when the sealing member 6 is positioned on the brazing material 7 disposed on the bottom plate 4, the sealing member 6 and the holding member 3
3, the holding member 33 descends together with the elevating member 44, while the sealing member 6 is fixed by melting the brazing material 7.

The means for attaching the holding member 33 and the sealing member 6 shown in the seventh and eighth embodiments is not limited to the brazing with the brazing material or the fixing with the adhesive.
As shown in FIG. 12A, a screw hole 6 is formed in the sealing member 6.
a may be recessed, and a screw shaft portion 33a may be formed at the upper end of the rod-shaped holding member 33, and may be detachably attached by screwing or the like. Further, instead of the detachable mounting means, the sealing member 6 and the holding member 33 are integrally formed, and when the portion of the holding member 33 protruding from the exhaust hole 5 is large, cutting is performed. You may. In this case, as shown in FIG. 12 (B), it is preferable to form a cut groove 33b just in a portion protruding from the exhaust hole 5 to improve the workability of the removing operation.

(Ninth Embodiment) FIG. 13A shows a thermos bottle 1 manufactured by the sealing method of the ninth embodiment. The thermos bottle 1 is different from the thermos bottle 1 in that the sealing member 6 is replaced by a brazing material 50 that melts at a temperature of about 200 ° C. to 500 ° C., preferably about 400 ° C. Further, in the present embodiment, the exhaust holes 5 formed in the bottom plate 3 are formed with a slightly smaller diameter than those of the above embodiments so that the high melting point brazing material 50 does not flow down.

In the ninth embodiment, first, FIG.
As shown in (B), similar to the first embodiment, the first
The brazing material 7 is disposed on the bottom plate 3 as a constituent member. Further, the exhaust hole 5 in the bottom 4a of the inner bottle 4 as the second component member is provided.
A brazing material 50 similar to the above is formed in a thickness that becomes spherical at the time of melting and falling, which will be described later, and is melt-fixed.

Thereafter, as shown in FIG. 13 (B), the double container 1 'is assembled so that the space S is formed in the exhaust device 10 shown in FIG.
Evacuated to about 400 ° C.
By heating the inner bottle 4 at the temperature shown in FIG.
As shown by the broken line, the high melting point brazing material 50 is melted,
It becomes spherical by its own weight and drops onto the exhaust hole 5 to seal the exhaust hole 5. At this time, since the low melting point brazing material 7 is disposed on the bottom plate 3, the brazing material 7
It plays a role of improving the wetting property between the zero and the bottom plate 3, and the exhaust hole 5 can be reliably sealed by the high melting point brazing material 50.

(Other Embodiments) The method for sealing a vacuum double structure of the present invention is not limited to the above-described structure. For example, in each of the above embodiments, as shown in FIG. 14, a recess 52 for disposing the brazing material 7 is formed at a position where the exhaust hole 5 is formed, and workability when the brazing material 7 is melted and fixed. It is preferred that the brazing material 7 can be reliably prevented from being detached after the arrangement. Also,
Although the sealing member 6 shown in the first to eighth embodiments is formed in a plate shape, it may be formed in a spherical shape as shown in FIGS. In this case, the spherical sealing member 6 ′ may be held on the bottom 4 a of the inner bottle 4 by any means from the first embodiment and the second embodiment. 3 is preferably formed with a recess 52 '.

Further, the place where the exhaust hole 5 is formed is the outer bottle 2
It goes without saying that the present invention is not limited to the bottom plate 3 and may be formed on the body of the outer bottle 3 or the like. Further, the vacuum double structure manufactured by the sealing method can obtain the same operation and effect even when applied to a vacuum double tube or the like.

[0071]

As is apparent from the above description, in the method for sealing a vacuum double structure according to the present invention, a brazing material is provided on the outer peripheral portion of the exhaust hole of the first constituent member, and Since each component is assembled in a state where the sealing member is positioned and held on the second component facing the component, the brazing material and the sealing member may come off in the assembly state of the component. Can be reliably prevented, so that the workability such as handling can be improved. In addition, when the space formed by the constituent members reaches a predetermined degree of vacuum, the sealing member can drop onto the exhaust hole and securely seal, so that a defectively sealed product occurs. Can be suppressed. Furthermore, since the exhaust hole of the first component is sealed by a sealing member,
Even if the diameter is formed to be relatively large, the sealing can be reliably performed, so that the time required for exhausting the space can be reduced, and as a result, the working time required for manufacturing can be reduced. be able to.

[Brief description of the drawings]

FIG. 1A is a cross-sectional view of a principal part showing a thermos that is a vacuum double structure manufactured by a sealing method according to a first embodiment of the present invention, and FIG. 1B is a partially enlarged cross-sectional view of FIG. It is.

2A is a cross-sectional view illustrating an exhaust device used for manufacturing the thermos of FIG. 1, and FIG. 2B is an enlarged cross-sectional view of a main part of the double container of FIG.

3A and 3B show an arrangement pallet of the exhaust device of FIG. 2A, wherein FIG. 3A is a plan view and FIG.

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

FIG. 5A is a cross-sectional view of a main part showing a thermos bottle manufactured by a sealing method according to a third embodiment, and FIG. 5B is a cross-sectional view of a main part of a double container before sealing.

FIG. 6A is a cross-sectional view of a main part showing a thermos bottle manufactured by a sealing method according to a fourth embodiment, and FIG. 6B is a cross-sectional view of a main part of a double container before sealing.

FIG. 7A is a sectional view of a principal part showing a thermos bottle manufactured by the sealing method of the fifth embodiment, and FIG. 7B is a sectional view of a principal part of a double container before sealing.

FIG. 8A is a cross-sectional view of a main part showing a thermos bottle manufactured by the sealing method of the sixth embodiment, and FIG. 8B is a cross-sectional view of a main part of a double container before sealing.

9A is a cross-sectional view of a main part showing a thermos bottle manufactured by the sealing method according to the seventh embodiment, and FIG. 9B is a cross-sectional view of a main part of a double container before sealing.

FIGS. 10A, 10B, and 10C are cross-sectional views showing a sealing operation by an exhaust device to which a sealing method according to a seventh embodiment is applied.

FIG. 11 is a sectional view showing an exhaust device to which a sealing method according to an eighth embodiment is applied.

FIGS. 12A and 12B show a seventh embodiment and an eighth embodiment;
It is sectional drawing which shows the modification of the sealing method of embodiment.

FIG. 13A is a cross-sectional view of a main part showing a thermos bottle manufactured by the sealing method according to the ninth embodiment, and FIG. 13B is a cross-sectional view of a main part of a double container before sealing.

FIG. 14 is a cross-sectional view showing a thermos manufactured by a modified example of the sealing method of each embodiment.

FIGS. 15A and 15B are cross-sectional views showing a thermos manufactured by a modified example of the sealing method of the first to eighth embodiments.

[Explanation of symbols]

1 ... thermos (vacuum double structure), 1 '... double container, 2 ...
Outer bottle, 3 ... Bottom plate (first component), 4 ... Inner bottle (second component), 4a ... Bottom, 5 ... Exhaust hole, 6 ... Seal member, 7 ...
Brazing material, 8: metal brazing material for positioning, 10: exhaust device,
11 furnace body, 12 placement pallet, 12a placement part,
13 ... heating means, 14 ... ejection nozzle, 15 ... exhaust pipe (exhaust means), 16 ... cooling pipe (cooling means).

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Shinya Yasuda 1-20-5 Tenma, Kita-ku, Osaka-shi, Osaka

Claims (16)

[Claims] 1. A method for sealing a vacuum double structure, wherein a space formed by a constituent member is evacuated from an exhaust hole formed in the constituent member, and the exhaust hole is sealed by a sealing member. A brazing material is fixedly provided around the exhaust hole on the space side of the first component member having the exhaust hole formed therein, and the brazing material is disposed on the space side of the second component member facing the first component member. The sealing member is positioned and held so as to face the exhaust hole, and the space is exhausted by arranging the exhaust hole so that the exhaust hole is located below. A method for sealing a vacuum double structure, characterized in that the brazing material is melted by heating to a temperature equal to or higher than the melting point of the molten material, and the exhaust hole is sealed with a sealing member via the brazing material. 2. The method according to claim 1, further comprising:
The method for sealing a vacuum double structure according to claim 1, wherein the second structural member is positioned and held by a bonding material that melts at a temperature of ° C. 3. The method for sealing a vacuum double structure according to claim 2, wherein a brazing material is used as the bonding material. 4. The method according to claim 4, wherein the joining material is formed in a rivet shape, an attachment member is provided on the second component, and the attachment member and the sealing member are fixed by penetrating the rivet-like joining material. The method for sealing a vacuum double structure according to claim 2 or 3, wherein the sealing method comprises the steps of: 5. The sealing member is formed of a magnetic material, and a temperature of about 200 ° C. is set on the space side of the second component member.
2. The vacuum double structure according to claim 1, wherein a magnetic material having a Curie temperature of from 500 to 500 ° C. is fixed, so that the sealing member is positioned and held on the second component via the magnetic material. Sealing method. 6. The method according to claim 1, wherein the sealing member is formed at a temperature of about 200 ° C. to 500 ° C.
By fixing to the magnetic material having a Curie temperature of, and forming the second component member from a magnetic material,
2. The method according to claim 1, wherein the sealing member is positioned and held on the second component via the magnetic material. 7. A magnetic material having a Curie temperature of about 200.degree. C. to 500.degree. C. on an outer surface of the second component member, wherein the sealing member is formed of a magnetic material. 2. The method according to claim 1, wherein the sealing member is positioned and held on the second component by magnetic force. 8. The sealing member is formed of a magnetic material, and the second component is formed of a magnetic material, whereby the sealing member is positioned and held on the second component. 2. The method for sealing a vacuum double structure according to 1. 9. A holding member for movably inserting the sealing member from the exhaust hole of the first component member into the space,
The method for sealing a vacuum double structure according to claim 1, wherein the holding member is positioned and held on the second constituent member by means of a lifting means for lifting and lowering the holding member. 10. The vacuum according to claim 9, wherein the sealing member and the holding member are detachably attached to each other, and after the exhaust hole is sealed, the sealing member and the holding member are separated from each other. Double structure sealing method. 11. The method for sealing a vacuum double structure according to claim 9, wherein the sealing member and the holding member are integrally formed. 12. The elevating means comprises an elevating member having magnetism, to which the holding member is detachably attached, and an electromagnet which forms a magnetic field by applying a current to elevate the elevating member. The method for sealing a vacuum double structure according to any one of claims 9 to 11. 13. The elevating means includes an evacuation device, and an elevating member that is housed in the evacuation device in an airtight state and detachably attaches the holding member to an upper end protruding from the evacuation device toward the vacuum double structure. And a rotating body rotatably screwed to the exhaust device and connected to a lower end of the elevating member, wherein the elevating member is moved up and down by rotating the rotating body. A method for sealing a vacuum double structure according to claim 11. 14. The vacuum double structure according to claim 1, wherein the sealing member is made of a brazing material, and the brazing material is positioned and held by joining the brazing material to the second component. Sealing method. 15. The method according to claim 1, wherein a metal plating for improving wettability is applied to a surface of the sealing member.
A method for sealing a vacuum double structure according to any one of claims 13 to 13. 16. The cooling device according to claim 1, wherein the first component member is cooled to prevent a brazing material disposed around the exhaust hole from melting before being sealed by a sealing member. A method for sealing a vacuum double structure according to claim 15.