JPS6320129B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a metal container body that has a space formed between an outer cylinder and an inner container, and an opening formed in one of the outer cylinder and the inner container, and a metal container main body that has a space formed between an outer cylinder and an inner container, and a metal container body that has an opening formed in one of the outer cylinder and the inner container, and a The present invention relates to an improved method for manufacturing a metal thermos flask, in which a metal lid is hermetically sealed with a brazing material after the space is evacuated in a vacuum heating furnace.

Conventionally, as shown in Figure 14,
192516), a plurality of solid brazing materials 7 are arranged at large intervals between the container body A and the lid 6,
The space 4 is evacuated by utilizing the large gap C formed between the container body A and the lid 6 due to the brazing material 7, and as the brazing material 7 melts, the container body A
was lowered under its own weight, and the molten brazing material 7 was forced to flow around the entire circumference of the opening 3.

The disadvantages of the above conventional method are as follows. In other words, since the solid brazing material 7 is arranged at large intervals in the circumferential direction of the opening 3, when the molten brazing material 7 is swept away by the weight of the container main body A, the molten brazing material 7 may sometimes fall off the lid. 6 and the opening 3 side, and not much in the circumferential direction of the opening 3, and the airtight connection between the container body A and the lid body 6 by the brazing material 7 is partially incomplete, and the outer cylinder 1 and There were cases where the degree of vacuum in the space 4 between the inner containers 2 decreased.

An object of the present invention is to improve the brazing material arrangement method so that the container body and the lid can be reliably airtightly joined.

The characteristic means of the manufacturing method according to the present invention is that the brazing material is
It is arranged between the container body and the lid over the entire circumference or almost the entire circumference of the opening to the space between the outer cylinder and the inner container, and is then melted and solidified by cooling.

Its action is as follows.

In other words, it was previously thought that a large gap had to be formed between the container body and the lid in order to exhaust air from the space between the outer cylinder and the inner container, but we have broken away from this preconceived idea. Confirmation experiments were conducted by placing the brazing material around the entire circumference or almost the entire circumference of the opening so that there was little or no gap between the container body and the lid.

As a result, they discovered that the space can be sufficiently evacuated and the container body and lid can be hermetically sealed completely and reliably.

The effects of the present invention are as follows.

Since we can ensure an airtight connection between the container body and the lid, we can maintain a sufficient degree of vacuum in the space between the outer cylinder and inner container for a long period of time, making it possible to reliably provide metal thermos flasks with excellent insulation performance. Summer.

Next, examples will be shown.

As shown in Fig. 1, the peripheral wall 1a of the outer cylinder 1 and the inner container 2 are hermetically welded at the mouth _W1 , and the peripheral wall 1a of the outer cylinder 1 and the bottom wall 1b with the opening 3 are hermetically welded at the bottom _W2. Then, a metal container body A in which a space 4 is formed between the outer cylinder 1 and the inner container 2 is manufactured.

Note that the outer surface of the inner container 2 is previously subjected to surface treatment such as copper plating.

Next, as shown in FIG. 2, the container body A is placed in the vacuum heating furnace 5 in an inverted position, and a metal lid 6 is placed between the container body A and the lid 6 to close the opening 3. The positioned brazing material 7 is placed on the container body A. At that time, brazing material 7 is placed all around or almost all around the opening 3, and gator material for removing gas (H ₂ , CO, CO _2, etc.) in the space 4 is placed around the lid 6 and the bottom. The opening 3, such as the inner surface of the wall 1b,
Place it close to.

Next, while exhausting the air from the sealed vacuum heating furnace 5 with the vacuum pump P, the air in the container body A, the lid body 6, and the brazing material 7 is sufficient to vaporize the volatile components of the brazing material 7.
The temperature in the vacuum heating furnace 5 is raised by the heater H to a temperature at which the gas does not melt, and the gas in the space 4 is sufficiently exhausted.

Thereafter, the furnace temperature is raised by the heater H to melt the brazing material 7, and the furnace temperature is further lowered to cool and solidify the brazing material 7, and as shown in FIG. The space 4 is sealed in a high vacuum state by brazing the lid 6.

The method of arranging the brazing material 7 can be selected as appropriate, and examples thereof will be described below.

(1) As shown in Fig. 4 A and B, a gel-like (kneaded toothpaste-like or clay-like) brazing material 7 made by kneading powdery brazing material with an organic solvent is uniformly spread over the entire circumference of the opening 3. Moreover, the lid 6 is placed on the applied gel-like brazing material 7 by applying it to the bottom wall 1b at an appropriate distance l from the opening 3 to prevent the melted brazing material 7 from flowing into the space 4, and the container body The airtight connection between A and the lid 6 is ensured completely.

(2) As shown in Fig. 5 A and B, apply the gel-like brazing material 7a to the bottom wall 1b in the same manner as in the method of item (1) above, and apply the gel on the applied gel-like brazing material 7a. The gel-like soldering material 7b is built up at one or more places, the lid body 6 is placed on the built-up gel-like soldering material 7b, and a space is formed by the gap C formed by the built-up gel-like soldering material 7b. 4 is further sufficiently vented, the melted brazing fillers 7a and 7b are prevented from flowing down into the space 4, and the brazing filler filler metal 7b is melted and pushed by the gravity of the lid 6. so that the container body A and the lid 6 are completely airtightly joined. Note that the number and arrangement of the gel-like brazing materials 7b can be changed freely.

(3) As shown in FIGS. 6A and 6B, gel-like brazing material 7 similar to the method described in item (1) above is applied to almost the entire opening 3 with a gap C formed at one or more locations. Around the circumference and at an appropriate distance l from the opening 3
The lid body 6 is placed on the gel-like brazing material 7 which has been applied to the bottom wall 1b at a distance of 100 cm from each other. 4, and the melted brazing material 7 is swept into the gap C by the gravity of the lid 6, so that the container body A and the lid 6 are completely airtightly joined.
Note that the number and arrangement of the gaps C can be changed freely.

(4) In the method of items (1) to (3) above, apply the gel-like brazing material 7 very close to the opening.

(5) As shown in A and B of Figures 7 and 9,
Brazing material 7 molded into an annular shape with an uneven surface
is placed on the bottom wall 1b so as to cover the entire circumference of the opening 3 and at an appropriate distance l from the opening 3,
The lid body 6 is placed on the protrusion 7c of the brazing material 7 to facilitate placement of the brazing material 7, and the space 4 is more fully evacuated due to the effect of the gap C formed by the uneven surface. In addition, the melted brazing material 7 is prevented from flowing down into the space 4, and the protrusion 7c is melted and swept away by the gravity of the lid 6, so that the container body A and the lid 6 are completely airtightly connected. ensure that it is done. Note that the brazing material 7 may be placed so that the uneven surface is on the bottom wall 1b side.
Further, the shape of the uneven surface can be changed freely.

(6) As shown in Fig. 9 A and B, it is annular and has a thin wall portion 7d on the inner circumferential side and a thick wall portion 7d on the outer circumferential side.
The brazing material 7 molded into the shape e is inserted into the opening 3
The lid body 6 is placed on the bottom wall 1b, positioned over the entire circumference of the opening 3, and at an appropriate distance l from the opening 3, and placed on the bottom wall 1b. Place it on the thin part 7d,
The brazing material 7 and the lid body 6 are easily and reliably placed in the predetermined positions, and the melted brazing material 7
To prevent water from flowing down into a space 4, and to completely airtightly connect a container body A and a lid 6.

(7) As shown in Fig. 10 A and B, it is annular and has a thin part 7d on the inner circumferential side and a thick part 7e on the outer circumferential side,
Furthermore, one or more protrusions 7f are attached to the thin wall portion 7.
The brazing material 7 molded into the shape shown in d is
Place it on the bottom wall 1b in the same way as in the method of item (6), and
e, and place the lid 6 on the protrusion 7f, so that the brazing material 7 and the lid 6 are easily and securely placed in the predetermined position, and also by the gap C formed by the protrusion 7f. , the space 4 is sufficiently vented, and the melted brazing material 7 is prevented from flowing down into the space 4, and the protrusion 7f is melted and swept away by the gravity of the lid 6, and the container body is The airtight connection between A and the lid 6 is ensured completely. Note that the number and arrangement of the protrusions 7f can be changed freely.

(8) As shown in FIGS. 11A and 11B, the brazing material 7 having a shape in which a gap C is formed in the brazing material used in the above item (6) is placed at the bottom in the same manner as in the method of the above item (6). The brazing material 7 is placed on the wall 1b and the lid 6 is placed on it in the same manner as in the method (6) above, so that the brazing material 7 and the lid 6 are easily and reliably placed in a predetermined position, and the space 4 is The exhaust of the soldering material is made more sufficient through the gap C, and the melted brazing material 7 is prevented from flowing down into the space 4, and furthermore, the melted brazing material 7 is swept into the gap C by the gravity of the lid body 6. , so that the container body A and the lid 6 are completely airtightly joined.

(9) As shown in Figure 12 A and B, two pieces of brazing material 7 are formed into semicircular arc shapes with grooves 8 on their inner peripheral surfaces, and the edges are fitted into the grooves 8. The lid body 6 is placed on the bottom wall 1b, and both brazing materials 7 are placed around the entire circumference or almost the entire circumference of the opening 3, and are spaced from the opening 3 by an appropriate distance l, and are positioned by the bottom wall 1b, The brazing material 7 and the lid 6 are easily and reliably placed in the predetermined positions, and the lifting of the lid 6 due to exhaust from the space 4 is suppressed by the brazing materials 7. The brazing material 7 is prevented from flowing down into the space 4, and furthermore, the melted brazing material 7 between the ends of both brazing materials 7 is swept away by the gravity of the lid 6, and the container body A and the lid 6 are tightly sealed. ensure that it is carried out completely. Note that three or more brazing materials 7 may be arranged in a ring shape.

(10) As shown in FIGS. 13A and 13B, a brazing material 7 formed into a shape with a gap C formed in a part of the annular body and a protruding portion 7g that covers the gap C from the outside is inserted into the opening. 3 and placed on the bottom wall 1b at an appropriate distance l from the opening 3, and place the lid 6 on the brazing material 7 so that the brazing material 7 can be easily placed. The gap C allows the space 4 to be sufficiently exhausted, prevents the melted brazing material 7 from flowing down into the space 4, and further prevents the melted brazing material 7 from flowing into the gap C due to the gravity of the lid body 6. washed away,
The brazing material flows into the gap C from the molten protruding portion 7g, so that the container body A and the lid 6 are completely airtightly joined.

The outer cylinder 1 and the inner container 2 have different shapes, dimensions, materials,
Other changes can be made as appropriate, and
Similarly, the opening 3 and the lid 6 can be freely changed in shape, size, material, etc. Also,
The position of the opening 3 can be changed as appropriate, such as forming it in the inner container 2.

The material of the brazing material 7 can be appropriately selected from nickel, aluminum, silver, palladium, copper, and others. The material of the brazing material 7 can be any of gel-like, solid, powdery, and other amorphous materials. In this case, it may be applied, placed, arranged, or any other method. In addition, different types of materials may be appropriately combined in part or all of their materials, properties, and arrangement methods.

The container body A may be arranged above the lid 6, and the molten brazing material 7 may be swept away by the weight of the container body A, thereby airtightly joining the container body A and the lid 6.

Various changes can be made to the specific configuration of the vacuum heating furnace 5 in terms of exhaust configuration, heating configuration, and others.

[Brief explanation of the drawing]

1 to 13 show examples of the present invention, FIG. 1 is a longitudinal sectional view of the container body, FIG. 2 is a schematic diagram showing the processing state in a vacuum heating furnace, and FIG. 3 is a container body 4 to 13 show different arrangements of the brazing material, and in each figure, A is a plan view;
B is a sectional view. FIG. 14 is an explanatory diagram of a conventional example. 1...Outer cylinder, 2...Inner container, 3...Opening, 4...
...Space, 5...Vacuum heating furnace, 6...Lid, 7...
Raw material, A...container body.

Claims (1)

[Claims] 1. A metal container body A with a space 4 formed between an outer cylinder 1 and an inner container 2 and an opening 3 formed in one of the outer cylinder 1 and the inner container 2, and a metal container body A for closing the opening 3. A method in which the lid body 6 is airtightly joined with a brazing material 7 in a vacuum heating furnace 5 after the space 4 is evacuated, and the brazing material 7 is
The opening 3 is located between the container body A and the lid 6.
A method of manufacturing a metal thermos flask that is placed around the entire circumference or almost the entire circumference of the flask, and then melted, cooled, and solidified.