JP2924851B2 - Vacuum sealing structure of metal vacuum double container - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum sealing structure for a metal vacuum double container used as an inner bottle such as a stainless steel bottle.

[0002]

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

The general structure of the above-mentioned vacuum sealing is shown in FIG.
As shown in FIG. 1, the inner container 1A made of metal (for example, stainless steel) and the outer container 1B are joined to each other on the side of the mouth 2 to form the double container 1, and the space 3 formed between them is formed. After evacuation of the gas, the exhaust port 12 is filled with a brazing material (for example, a metal brazing material).
(See, for example, Japanese Patent Application Laid-Open No. 3-267623).

[0004]

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

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

In view of the above problems, the use of a glass solid sealing material that melts at a low temperature has been studied in recent years. In this case, as shown in FIG. 3, a storage recess 9 having a small-diameter exhaust port 12 is formed at the bottom of the outer container 1B,
A rod-shaped glass sealing material 10 is housed and arranged in the housing recess 9, evacuated in a vacuum evacuation chamber, and the glass sealing material 10 is further melted so that the exhaust port 12 formed in the housing recess 9 is melted glass. Is sealed.

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

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

[0009]

SUMMARY OF THE INVENTION The present invention relates to a metal vacuum container having a metal inner container and a metal outer container. Forming a storage recess having an exhaust port sealed by stagnation of the sealing material that melts during vacuum evacuation,
A paste-like sealing material obtained by kneading a powdery or granular glass sealing material with a peroxide is used as the sealing material.

[0010]

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

That is, the paste-like sealing material obtained by kneading the powdery or granular glass sealing material with a peroxide is accommodated in the accommodating recess, so that the paste-like sealing material adheres to the accommodating recess. Not only can be prevented, but also an oxide film can be formed on the metal surface by the oxidizing action of the nascent oxygen generated from the peroxide when the sealing material is melted (to improve the adhesion with the molten sealing material). Can be

[0012]

According to the present invention, in a metal vacuum double container comprising a metal inner container and a metal outer container,
On the bottom surface of the outer container, a storage recess is formed having an exhaust port that stores the sealing material and is sealed at the bottom by the stagnation of the sealing material that is melted during vacuum evacuation. Alternatively, a paste-like sealing material obtained by kneading a granular glass sealing material with peroxide is used, so that the paste-like sealing material can be prevented from falling off by being in close contact with the storage recess without providing a falling-off preventing member. Is obtained, the handling becomes easy, and an oxide film is formed on the metal surface by the oxidizing action of nascent oxygen generated from the peroxide when the sealing material is melted, so that the adhesion of the molten sealing material is improved. There is an excellent effect of improving.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

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

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

The bottom plate 6 is formed by bending a peripheral portion 6a in a hook shape and bulging outward in a reverse trapezoidal shape in a state where a ring-shaped groove 7 is left between the central portion and the peripheral portion 6a. The shape is such that a bulging portion 8 is formed.

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

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

The sealing material 10 is a paste-like material obtained by kneading a powdery or granular glass sealing material with a peroxide (in the case of this embodiment, hydrogen peroxide solution H ₂ O ₂ ). It is to be attached to the periphery of the bottom 9 a of the storage recess 9.

As described above, the sealing material 10 is
The double container 1 affixed to the bottom 9a is mounted on a carrier frame and transferred to an evacuated chamber. In the process of being transferred through the evacuated chamber, the double container 1 is first evacuated at a temperature lower than the melting point of the sealing material 10. After the air between the inner and outer containers 1A and 1B is degassed (that is, baked) from the port 12, the air is heated at a temperature higher than the melting point of the sealing material 10 (that is, sealed).
As a result, the sealing material 10 melts and flows downward, is guided by the funnel-shaped recess 11, reaches the exhaust port 12, and stays there. As shown by reference numeral 10 ', the exhaust port 12 is securely sealed. Is done.

That is, in the case of this embodiment, since the sealing material 10 is attached to the bottom 9a of the storage recess 9, even when the carrier frame is swung when the carrier frame is transferred on the carrier frame. In addition, the sealing material 10 does not fall off from the predetermined position, which greatly contributes to improvement of sealing accuracy and automation of the sealing operation.

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

When the sealing material 10 is melted during vacuum sealing, the aqueous hydrogen peroxide H ₂ O ₂ is decomposed as shown in the following reaction formula to generate nascent oxygen (O) having extremely strong oxidizing power.

H ₂ O ₂ → H ₂ O + (O) The oxidizing action of the nascent oxygen (O) results in the formation of an oxide film on the metal surface, and the molten sealing material 1 made of glass
The adhesion between 0 'and the metal is improved. In addition, as the peroxide, those other than the hydrogen peroxide solution can be used.

[Brief description of the drawings]

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

FIG. 2 is a longitudinal sectional view of a metal vacuum double container having a conventionally known vacuum sealing structure.

FIG. 3 is an enlarged cross-sectional view of an exhaust port in a conventional metal vacuum double container having a vacuum sealing structure.

[Explanation of symbols]

1 is a double container, 1A is an inner container, 1B is an outer container, 2 is a mouth, 3 is a space, 6 is a bottom plate, 9 is a storage recess, 9a is a bottom, 10 is a sealing material, and 12 is an exhaust port.

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) A47J 41/02 102 B21D 51/18

Claims (1)

(57) [Claims] 1. A metal vacuum container comprising a metal inner container and a metal outer container, wherein a sealing material is accommodated on the bottom surface of the outer container and the bottom is melted during vacuum evacuation. A paste-like sealing material obtained by kneading a powdery or granular glass sealing material with a peroxide is used as the sealing material while forming a storage recess having an exhaust port sealed by the retention of the porous material. A vacuum-sealed structure of a metal vacuum double container.