JPH05192823A - Manufacture of stainless steel vacuum double wall vessel - Google Patents

Abstract

PURPOSE:To prevent an inner bottle from being tilted to contact an outer bottle even when a gap between the inner bottle and the outer bottle is small. CONSTITUTION:An inner bottle 1 is inserted into the shell 2c of an outer bottle 2, and the bottom 1a of the inner bottle 1 is pressed by a press-in jig 4 so as to fit the mouth-part 1b of the inner bottle 1 to the mouth-part 2b of the outer bottle 2 to join the mouth-parts 1b, 2b to each other. In the manufacturing method of a stainless steel vaccum double wall vessel in which a space between the inner bottle 1 and the outer bottle 2 is evacuated, a recessed or projected- shaped engaging part 5 is provided in the middle of the bottom 1a of the inner bottle 1 after the bottom 2a is joined to the shell 2c of the outer bottle 2, and a guide part 8 for engaging the engaging part 5 of the inner bottle 1 is provided on the press-in jig 4 for pressing the bottom 1a of the inner bottle 1 to guide and press the inner bottle 1 by engaging the guide part 8 of the press-in jig 4 with the engaging part 5 of the inner bottle 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a stainless steel vacuum double container used for a thermos bottle or the like.

[0002]

2. Description of the Related Art Conventionally, in the production of a stainless steel vacuum double container, as shown in FIG. 3, the mouth 12b of the outer bottle 12 is fixed to a support 13 and then the barrel 12c of the outer bottle 12 is fixed. Insert the inner bottle 11 into the inside and press the bottom 11a of the inner bottle 11 into the press-fitting jig 14
To press the mouth portion 11b of the inner bottle 11 into the mouth portion 12 of the outer bottle 12.
The method of fitting to b is adopted. After inserting the inner bottle 11 into the outer bottle 12 in this manner, the mouth portions 11b and 12b are joined together, and the body 12 of the outer bottle 12 is joined.
The bottom 12a is joined to c, and the space between the inner bottle 11 and the outer bottle 12 is evacuated to create a vacuum. Although the bottom 11a of the inner bottle 11 is spherical and has a pressure-resistant structure, the press-fitting jig 14 that contacts the bottom 11a of the inner bottle 11 is also spherical.

[0003]

However, in the conventional manufacturing method, even if the inner bottle 11 inserted in the body 12c of the outer bottle 12 is inclined as shown in FIG. Since it is pressed by 14, the inner bottle 11 and the outer bottle 12 may come into contact with each other, which may impair the heat insulating property. For this reason, in the conventional vacuum double container, it is necessary to take a large gap (about 4 mm) between the inner bottle 11 and the outer bottle 12 so that they do not come into contact with each other. Therefore, the conventional vacuum double container lacks compactness because the outer diameter of the outer bottle 12 is large relative to the inner diameter of the inner bottle 11. An object of the present invention is to solve such a problem, and to manufacture a stainless steel vacuum double container in which the inner bottle is inclined and does not come into contact with the outer bottle even if the gap between the inner bottle and the outer bottle is small. It is intended to provide a method.

[0004]

In order to achieve the above object, the present invention inserts the inner bottle into the body of the outer bottle and presses the bottom of the inner bottle with a press-fitting jig so that the mouth of the inner bottle is opened. Fit into the mouth of the outer bottle,
In the manufacturing method of the stainless steel vacuum double container that joins the mouth parts and joins the bottom to the body of the outer bottle and then makes the space between the inner bottle and the outer bottle vacuum, While providing a concave or convex engaging portion on the inner side of the inner bottle, a guide portion that engages with the engaging portion of the inner bottle is provided on the press fitting jig that presses the bottom of the inner bottle, By engaging with the engagement portion of the bottle, the inner bottle was pressed while being guided.

[0005]

According to the present invention, when the bottom of the inner bottle inserted into the body of the outer bottle is pressed by the press-fitting jig, the guide portion of the press-fitting jig engages with the engaging portion of the inner bottle and the inner bottle is engaged. Is guided so that it does not deviate from the center of the outer bottle. Therefore, the inner bottle is pressed without tilting and its mouth is fitted to the mouth of the outer bottle.

[0006]

Embodiments of the present invention will now be described with reference to the drawings. In FIG. 1, 1 is an inner bottle made of stainless steel, 2 is an outer bottle made of stainless steel before joining a bottom 2a (see FIG. 2), 3 is a support, and 4 is a press-fitting jig. Bottom 1a of inner bottle 1
Is formed of a spherical surface that bulges inward, and a circular concave engaging portion 5 that is pressed inward is formed in the center thereof. The outer surface of the inner bottle 1 is covered with a foil 6 made of copper or aluminum for preventing radiation and absorbing a gas liberated after exhaust treatment described later except for the vicinity of the engaging portion 5.

The support base 3 is formed with a fitting hole 7 into which the mouth portion 2b of the outer bottle 2 is fitted. The press-fitting jig 4 can be moved up and down by a drive device (not shown), and a circular convex guide portion 8 that engages with the engaging portion 5 of the inner bottle 1 is formed on the pressing surface. If the inner diameter of the engaging portion 5 is too large, the capacity loss is large, and the bottom 1a is a thin plate, so that deformation is likely to occur. On the other hand, if it is too small, the amount of wear of the guide portion 8 that engages with the engaging portion 5 increases, resulting in poor durability. Therefore, a small diameter of about 20 mm is suitable for the engaging portion 5.

In the manufacturing method according to this embodiment, first, as shown in FIG.
As shown in FIG. 3, the outer bottle 2 is turned upside down and its mouth 2 b is fitted into the fitting hole 7 of the support base 3. Next, the inner bottle 1 is turned upside down and inserted into the body 2c of the outer bottle 2, and the mouth portion 1b thereof is inserted into the outer bottle 2c.
It is brought into contact with the inner part of the mouth portion 2b of the. Then, the press-fitting jig 4 is lowered to press the bottom 1a of the inner bottle 1. At this time, even if the inner bottle 1 is slightly tilted, the guide portion 8 of the press-fitting jig 4 is engaged with the engaging portion 5 of the bottom 1a of the inner bottle 1 and the barrel 2c.
It is returned to the center of and becomes upright. Further, the inner bottle 1 is guided by the guide portion 8 so as not to be displaced from the center of the body 2c of the outer bottle 2 while being pressed by the press-fitting jig 4, so that the inner bottle 1 is pressed straight and its mouth portion 1b is exposed. Fit into the mouth 2b of the bottle 2.

Therefore, even if the gap between the inner bottle 1 and the outer bottle 2 is small, the inner bottle 1 and the outer bottle 2 are integrated while maintaining the gap. Therefore, it is possible to easily assemble even a compact container in which the gap between the inner bottle 1 and the outer bottle 2 is smaller than the conventional 4 mm, for example, about 2 mm. After the inner bottle 1 and the outer bottle 2 are integrated in this way, the bottom 2a to which the tip tube 9 is connected is expanded while the outer bottle 2 is bulged outward as shown by the chain double-dashed line in FIG. After fitting to the end of the body 2c, the mouth portion 1b of the inner bottle 1 and the mouth portion 2b of the outer bottle 2 are welded, and the body 2c of the outer bottle 2 and the bottom 2a are welded. Then, the air in the space between the inner bottle 1 and the outer bottle 2 is exhausted through the tip tube 9, the tip tube 9 is crushed and sealed in a vacuum state, and finally the bottom 2a of the outer bottle 2 is closed. Push inward as shown by the solid line.

In the above embodiment, the engaging portion 5 of the bottom 1a of the inner bottle 1 is formed into a circular concave shape, and the guide portion 8 of the press-fitting jig 4 is formed into a circular convex shape. The engaging portion 5 may be convex and the guide portion 8 of the press-fitting jig 4 may be concave so that the engaging portion 5 is engaged. The shapes of the engaging portion 5 and the guide portion 8 may be conical or spherical. Further, the manufacturing method according to the present invention is not limited to the one in which the inner bottle 1 has the spherical bottom 1a that bulges inward as in the above-described embodiment, but the spherical or planar bottom that bulges outward. It goes without saying that the present invention can also be applied to those having 1a.

[0011]

As is apparent from the above description, according to the present invention, the inner bottle is guided by the guide portion of the press-fitting jig so that the mouth portion fits into the mouth portion of the outer bottle without tilting. Therefore, the stainless steel vacuum double container having a small gap between the inner bottle and the outer bottle is easily manufactured. That is, it is possible to manufacture a compact container having the same inner diameter as the conventional one but a smaller outer diameter, or the same outer diameter as the conventional one but having a larger inner diameter and a shorter height.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing one step of a method for manufacturing a stainless steel vacuum double container according to the present invention.

FIG. 2 is a cross-sectional view of a stainless steel vacuum double container manufactured by the method according to the present invention.

FIG. 3 is a cross-sectional view showing one step of a method for manufacturing a conventional stainless steel vacuum double container.

[Explanation of symbols]

1 ... inner bottle, 1a ... inner bottle bottom, 1b ... inner bottle mouth part, 2 ... outer bottle,
2a ... Outer bottle bottom, 2b ... Outer bottle mouth part, 2c ... Outer bottle body, 4 ... Press-fitting jig, 5 ... Engagement part, 8 ... Guide part.

Claims (1)

[Claims] 1. An inner bottle is inserted into the body of the outer bottle, and the bottom of the inner bottle is pressed by a press-fitting jig to fit the mouth portion of the inner bottle into the mouth portion of the outer bottle.
In the method of manufacturing a stainless steel vacuum double container that joins those mouths and joins the bottom to the body of the outer bottle, and then makes the space between the inner bottle and the outer bottle vacuum, While the concave or convex engaging portion is provided on the inner side of the inner bottle, a guide portion that engages with the engaging portion of the inner bottle is provided on the press fitting jig that presses the bottom of the inner bottle, A method for manufacturing a stainless steel vacuum double container, characterized in that the inner bottle is pressed while being guided by being engaged with an engaging portion of the bottle.