JPH0354571B2 - - Google Patents

Description

[Detailed Description of the Invention] (Technical Field of the Invention) The present invention relates to a method for manufacturing a metal vacuum double heat insulation container such as a metal thermos flask, and in particular, a method for manufacturing a metal vacuum double heat insulation container using a chip tube method. .

(Prior Art and its Problems) Conventionally, for example, a tip tube system has been used as one type of metal thermos flask.

In this method, a metal inner container and a metal outer container with a tip tube at the bottom are TIG-welded at their upper edges to form the container body, which is then heated to a high temperature and the tip tube is vacuumed. The space between the inner and outer containers is evacuated by connecting to an exhaust means, and the tip tube is sealed by crimping and cutting with a pinch-off machine.

By the way, this method has various advantages, but since the tip tube protrudes downward from the bottom of the outer container, it is necessary to cover it with a bottom cover.
This poses a problem in that the height of the thermos bottle increases accordingly.

To prevent the tip tube from protruding downward from the bottom of the outer container, use the method shown in FIG.
16039), the bottom 2 of the outer container 1
The tip tube 3 may be positioned in the recess 4 by protruding upward. In addition, 6 is a bottom cover.

In this way, the tip tube 3 does not protrude below the outer container 1, but a predetermined distance l is required between the bottom of the tip tube 3 portion of the outer container 1 and the bottom of the inner container 5. Therefore, the distance L between the outer circumference of the bottom of the outer container 1 and the bottom of the inner container 5 must be increased. Since the shape of the inner container 5 remains the same as before, that is, the amount of protrusion of the conventional tip tube 3 becomes the lower end extension S of the outer container 1, and as a result, the above-mentioned problem cannot be improved. . This is true not only for thermos flasks but also for other metal vacuum double-layer heat-insulating containers.

Furthermore, in the case shown in FIG. 6, the tip tube 3 is cut by inserting a pinch-off machine (not shown) into the narrow recess 4, so the pinch-off machine is a small special device and is expensive. Another problem is that the work efficiency is poor because the cutting work is performed within a narrow recess 4.

The present invention focuses on the fact that, in the conventional device shown in FIG. To provide a method for manufacturing a metal vacuum double heat insulation container that solves the first problem by utilizing dead space a, and also allows tip tubes to be easily cut with a pinch-off machine used in the conventional tip tube method. The purpose is to

(Means to Solve the Problems) In order to achieve the above object, the present invention provides a metal vacuum double heat insulation container comprising a metal inner container and a metal outer container equipped with a tip tube at the bottom. An outer container having a tip tube at the bottom is welded to an inner container having a bottom outer periphery projecting downward, and the tip tube is connected to a vacuum evacuation means to evacuate the space inside the inner and outer containers. The tip tube protruding from the lowest position at the bottom of the outer container is cut to a predetermined length using a conventional pinch-off machine and sealed.Then, the area around the cut tip tube of the outer container is pressed against the inner container side. This is a method of manufacturing a metal vacuum double-wall heat-insulating container, in which a portion of the inner container is located in a recess formed by the protruding portion of the inner container.

(Example) Next, a case where the present invention is applied to a metal thermos flask will be described with reference to the drawings.

FIG. 1 shows a metal thermos flask, which is one of the metal vacuum double heat insulation containers manufactured according to the present invention, and is generally made of a metal plate such as stainless steel, with an inner container 11 welded at the upper end A, and an inner container 11 in the center. Tip tube 16
A container body 10 consisting of an outer container 14 having
A shoulder member 18 made of synthetic resin is attached to the inner and outer surfaces of the upper end of the container body 10 via a packing 17, a plug body 20 is screwed onto the shoulder member 18 with a screw 19, and a stopper member 20 is attached to the outer periphery of the shoulder member 18. It consists of a lid member 22 screwed together with screws 21 and a bottom cover 23 attached to the lower part of the outer container 14.

In addition, 24 is a gasket provided on the plug body 20, and 25
26 is the getter, and 26 is the tip tube 16 when the bottom cover 23 is attached to the bottom of the outer container 14 by fitting or the like.
It is a padskin that protects.

The basic configuration described above is conventionally known.

In the present invention, the bottom of the inner container 11 has a protrusion 12 that protrudes downward at the outer periphery, that is, the center of the lower surface of the bottom is a recess 13, and the bottom of the outer container 14 is formed in this recess 13. The central portion 15 is positioned so as to protrude upward.

Therefore, a part of the tip tube 16 is in the recess 1.
3, the tip tube 16 hardly protrudes from the bottom of the outer container 14, similar to the conventional example.

However, in the conventional example, the bottom of the inner container 11 is located as shown by the dashed line in the figure.
As described above, although the height of the entire thermos flask does not change, in the present invention, the bottom outer circumference of the inner container 11 protrudes downward at the protrusion 12, so the volume of the shaded area substantially increases. , that is, the inner container 11
If the volume is constant, the height can be reduced by an amount corresponding to the volume of the shaded area.

In addition, in the embodiment, the outer container 14 is connected to the body member 14a.
and the bottom member 14b, but these may be integrated.

Next, a method for manufacturing the metal thermos flask will be explained with reference to FIGS. 2 to 4.

First, the bottom of the inner container 11 has a protrusion 12 that protrudes downward on the outer periphery, and a recess 13 in the center of the lower surface of the bottom.
is formed in advance by molding, and its outer surface is plated.

On the other hand, the outer container 14 includes a body member 14a and a bottom member 14.
The bottom member 14b has a dish shape with a concave center, and a tip tube 16 is brazed to the center thereof as in the conventional case. The body member 14a and the bottom member 14b are welded at point B, and the inner container 11 and outer container 14 are welded at point A (see FIG. 1) to be integrated.

Next, the container body 10 consisting of the inner container 11 and the outer container 14 is heated as is conventionally known, and as shown in FIG. The space 27 formed between the containers 11 and 14 is brought to a predetermined degree of vacuum.

Thereafter, as in the prior art, the tip tube 16 is crimped and cut using a pinch-off machine 28 having two rollers 28a under hydraulic operation to seal it (see FIG. 3).
In this case, the chip tube 16 is generally Φ10×
If a Φ8×80L Cu pipe is used, approximately 20mm of the tip tube 16 will remain in order to prevent the brazed portion from peeling off.

Furthermore, as is clear from the above, the tip tube 16 is cut by the pinch-off machine 28 in a state where the tip tube 16 protrudes from the lowest part of the bottom member 14b, that is, in the same state as in the conventional general tip tube method. No special pinch-off machine is required.

After cutting the tip tube 16 in this way, as shown in FIG.
By pressing the outer part of the tip tube 16 of the bottom member 14b, this part is inserted into the recess 13 of the inner container 11.
It is positioned so as to protrude so as to maintain a predetermined distance 1 within the center (see FIG. 1).

In the above embodiment, the outer container has a two-part structure, but it may be an integral structure, and the getter 25 may be attached at the position shown in FIG. 2.

Furthermore, in FIGS. 2 to 4, the outer container 1
Although a step (corner) T is provided at the bottom of 4, it is not necessary to provide a step as shown in FIG. Wrinkles may occur, and these wrinkles may appear on the outer peripheral surface of the outer container 14.

However, if the stepped portion (corner portion) T is provided, work hardening occurs in this portion and the so-called stiffness is increased, so that the sheet can be bent in a smooth curve without wrinkles.

In the above embodiment, a metal thermos flask was described, but it goes without saying that the present invention is applicable not only to thermos flasks but also to various other types of heat insulation containers such as metal vacuum double heat insulation containers.

(Effects of the Invention) As is clear from the above description, according to the present invention, the inner container has a bottom outer peripheral portion that protrudes downward, and
In a method for manufacturing a metal vacuum double heat insulation container comprising an outer container having a tip tube and a bottom center portion protruding upward, when cutting the tip tube, etc., the inner container and the outer container having a bottom center portion protruding downward are removed. Since the tip tube is welded and integrated, that is, cut and sealed with the tip tube protruding from the bottom of the outer container, it can be easily cut with a conventional pinch-off machine.

Furthermore, since the bottom of the outer container is pressed against the inner container after the tip tube is sealed, after the space between the inner and outer containers is evacuated, the pressing force can be small.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a metal thermos flask manufactured by the method of the present invention, Fig. 2 is a partial sectional view showing the inner container and the outer container, and Figs. 3 and 4 show the evacuation of the container body and the tip tube. Explanatory diagram showing the cutting and pressing process, fifth
The figure is an explanatory diagram showing an example of the bottom of the outer container, and FIG. 6 is a sectional view of a conventional metal thermos flask. 10-container body, 11-inner container, 12-projection, 13-recess, 14-outer container, 14a-body member, 14b-bottom member, 16-tip tube, 27-space.

Claims (1)

[Claims] 1. In a metal vacuum double insulation container consisting of a metal inner container and a metal outer container with a tip tube at the bottom, the inner container has a bottom outer periphery protruding downward, and the inner container has a tip tube at the dish-shaped bottom. After welding an outer container having a A method for manufacturing a metal vacuum double heat insulation container, characterized in that the periphery of the chip tube cut part is pressed toward the inner container, and this part is positioned in the recess formed by the protrusion of the inner container. .