JPS5928933A - Production of metal magic pot - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to a method for manufacturing a metal thermos flask.

In recent years, metal thermos flasks made of metal inner and outer cylinders have been commercialized. This metal thermos is made of a thin plate of about 0.15 to 0.3III11, such as 18-8 stainless steel or 13Cn, which has poor heat conductivity as a metal or alloy. Compared to thermos flasks, which are made of aluminum, they are resistant to shock and have excellent heat retention, have a high volume ratio of internal volume to external volume, and are easy to handle because the mouth can be enlarged and ice etc. can be easily added.
It is excellent in various respects. And this metal 1JI
To manufacture the 11-method bottle, there are methods that use a vacuum heating furnace, methods that use electron beam welding, etc. First, in the case of using a vacuum heating furnace, as shown in FIG.
102 is inverted, and a metal plate 105 is inserted into the opening 103 at the bottom of the outer cylinder 102 through a metal brazing material 104.
is placed in a vacuum heating furnace and subjected to vacuum heating treatment to melt the metal brazing material 104 and weld and lock the metal plate 105 in the opening 103 airtightly, thereby forming the inner cylinder 101 and the outer cylinder 102
The space between the two is a vacuum insulation layer. Further, in the case where electron beam welding, which allows airtight welding to be performed relatively easily, is used, the metal plate 105 that closes the opening 103 in FIG. 1 is welded to the bottom of the outer cylinder 102 by electron beam welding. In both methods, the final processing is performed under vacuum, and the dimensions of the thermos flask must be adjusted to create a vacuum environment.

Considering the shape, a fairly large-scale device is required.

Therefore, although the thermos bottle itself is relatively small, large-scale equipment is required to manufacture it, making it troublesome to manufacture, resulting in an expensive product. In addition, as a manufacturing method, for example, the opening 103 shown in FIG. The opening can also be sealed by welding or other methods, but the process is complicated and time-consuming, and it lacks reliability.

The present invention has been made in view of the above-mentioned conventional circumstances, and includes:
An object of the present invention is to provide a method for manufacturing a metal thermos flask that can be manufactured even without a vacuum environment.

The present invention will be explained below with reference to the illustrated embodiments.

FIG. 2 shows a cross-sectional view of a metal thermos flask 10 manufactured by the manufacturing method of the present invention. The metal thermos flask 10 includes an outer cylinder 1, an inner cylinder 2 disposed inside the outer cylinder 1, and connected to the upper part of the outer cylinder 1 by bending or welding, and a bottom part of the outer cylinder 1. It is composed of a bottom plate 4 which serves as a sealing member of the present invention that closes the opening 3. The outer cylinder 1 and the inner cylinder 2 form a cylindrical gap 5 that serves as a vacuum heat insulating layer. Further, a getter agent 6 is attached to the inside of the cylindrical gap 5 on the inner peripheral wall of the outer cylinder 1 at an appropriate time, such as before the bottom plate 4 is attached by welding. A spring member 41 extending vertically from the bottom plate 4 and a spring member 21 extending horizontally from the inner wall of the inner cylinder 2 are disposed on the bottom surface and bottom side of the inner cylinder 2, and the cylindrical gap 5 serving as a vacuum insulation layer is disposed. The inner cylinder 2 is positioned so that the thickness, that is, the distance between the outer cylinder 1 and the inner cylinder 2, is uniform. The metal III method bottle 10 is constructed as described above, and the manufacturing method of the present invention will now be described in detail.

The processing order according to the manufacturing method of the present invention is as follows.

(1) First, a thermos flask body 10- as shown in FIG. 3 is prepared, in which the outer cylinder 1 and the inner cylinder 2 are integrally molded at the upper part, and the outer cylinder 1 and the inner cylinder 2 are both open at the bottom. Then, the getter agent 6 is fixed in the cylindrical gap between the outer cylinder 1 and the inner cylinder 2 of this thermos bottle body.

■Next, the bottom part 2 has the spring material 21 fixed by welding etc. in advance.
' is hermetically welded to the inner cylinder 2 using a laser beam. The spring material 21 is set so as to come into contact with the inner wall of the outer cylinder 1 when the bottom portion 2' is welded.

■Next, it is released into air at atmospheric pressure or into a gas atmosphere that corresponds to the adsorption gas characteristics of the inserted getter agent 6, or into a reduced pressure of about 10 to 100 mm Ω of these air or gases. Then, the bottom plate 4 that closes the opening 3 at the bottom of the outer cylinder 1 is hermetically welded using a laser beam.

■Heat-treat the structure as described above to obtain getter agent 6.
The cylindrical gap 5 between the outer cylinder 1 and the inner cylinder 2 is created by the adsorption action of
is the vacuum insulation layer.

The getter agent 6 used in the final step is a gas-adsorbing substance that physically adsorbs or chemically absorbs the air existing in the space between the outer tube 1 and the inner tube 2 or the gas in the laser beam welding atmosphere. It functions to capture by adsorption. Substances include magnesium, barium, titanium, aluminum, and zeolite. The amount of gas such as air to be adsorbed here is proportional to the surface area of the getter agent, so it is desirable that the getter agent has a large surface area. It is preferable to install the

Metal thermos flask 1 completed by the steps from ■ to ■ above.
0 can be completed as a product by attaching a lid with excellent sealing properties. Various types of lids can be used, but
For example, as shown in FIG.
Those equipped with this are superior.

Further, in the above embodiment, the bottom part 2- of the inner cylinder 2 is welded to form an integral cylinder, but the inner cylinder 2 may be formed into a cylinder in advance. In general, the opening 3 at the bottom of the outer cylinder 1 may also be a relatively small opening, and the opening may be closed by the bottom plate 4. Furthermore, other steps are not limited to the above embodiments. For example, a deaeration hole such as a small hole 6 or a small bottle mouth is provided at an appropriate position on the outer cylinder 1 or the bottom plate 4, and after laser beam welding, air is removed from this deaeration hole. The getter agent adsorbed gas may be reduced by sealing and post-heating to allow the getter agent to act.

As explained above, in the present invention, a container is manufactured by laser beam welding, and a vacuum heat insulating layer is formed by a getter agent sealed inside. Therefore, there is no need to manufacture it in a vacuum environment as in the conventional technology, and there is no need for the entire device to be as large as a large tree. can do.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a metal thermos flask illustrating a conventional manufacturing method, FIG. 2 is a cross-sectional view of a metal thermos obtained by the manufacturing method of the present invention, and FIG. 3 is a manufacturing method of the metal thermos flask shown in FIG. 2. FIG. 4 is an exploded perspective view for explaining the method, and a sectional view showing an embodiment of the lid of a metal thermos flask. 1... Outer cylinder, 2... Inner cylinder, 3... Frontage, 4... Bottom plate (sealing member), 5... Vacuum heat insulating layer, 6...Getter agent, 10...Metal thermos flask, Applicant: Inoue Japax Research Institute, Patent Attorney Masu 1] Takeo, Figure 2, Figure 3 4th thorn

Claims (1)

[Claims] 1. A method for manufacturing a metal thermos flask comprising a metal inner cylinder and an outer cylinder, wherein a getter is inserted into a space formed by the outer cylinder and the inner cylinder from an opening at the bottom of the outer cylinder. a metal sealing member is welded to the opening at the bottom of the outer cylinder by laser beam welding, and then the outer cylinder is heated to adsorb air or gas in the space to the getter agent; A method for manufacturing a metal thermos flask, characterized in that the space is a vacuum insulation layer.