JPH041866Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a glass vacuum double bottle used for magic bottles and the like.

BACKGROUND TECHNOLOGY In general, a double vacuum bottle 1 made of glass consists of an inner bottle 2 and an outer bottle 3 made of glass, as shown in FIG. The air in the gap 4 between the inner bottle 2 and outer bottle 3 is exhausted and a vacuum is created. A tip tube 5 is usually welded to the center of the bottom of the outer bottle 3, and after the air in the gap 4 is discharged from the tip tube 5, it is sealed, thereby maintaining the gap 4 in a vacuum. .

In the conventional vacuum double bottle 1, a glass tube with an outer diameter of about 9 mm and a wall thickness of about 1 mm is used as the tip tube 5.

Problems to be Solved by the Invention However, in the conventional vacuum double bottle 1, various problems arise due to the large outer diameter of the tip tube 5.

That is, the tip tube 5 is not attached to the outer bottle 3 at first, and in the manufacturing process of the vacuum double bottle 1, a hole is drilled in the outer bottle 3 and the tip tube 5 is welded thereto. As shown in the figure, since the diameter of the tip tube 5 is large, it is necessary to drill a hole 6 with a large diameter corresponding to the diameter of the tip tube 5 in the bottom of the outer bottle 3, and the glass in the hole 6 is It bulges around the periphery of 6, and a thick portion 7 is formed in that portion.

After welding the tip tube 5 to the periphery of the hole 6, the tip tube 5 is pulled downward to stretch the thick part 7 and to make the thick part 7 thinner, in order to prevent distortion due to changes in wall thickness. Must be equal to outer bottle 3. At this time, as shown in FIG. 3b, the outer bottle 3 around the tip tube 5 protrudes downward, and a large bulge 8 is formed.

Furthermore, when sealing the chip tube 5, as shown in FIG.
As shown in the figure, the chip tube 5 is heated and melted with a burner 9, stretched thin, burned out, and sealed. However, since the chip tube 5 is thick, a large amount of gas is required to melt it. It is necessary to heat the product for a long time, and it is necessary to apply a large amount of heat to the welding part. Therefore, if an attempt is made to seal the tip tube 5 at a position close to the bulge 8, the radiant heat from the burner 9 will cause thermal distortion in the bottom of the outer bottle 3 and the bulge 8, making the outer bottle 3 more likely to break. Therefore, the bulge 8
It is necessary to provide a sufficiently large distance between the burner 9 and the burner 9 to minimize the occurrence of thermal distortion. Therefore, the sealing position of the tip tube 5 is separated from the outer bottle 3, and the length of the sealed tip tube 5 becomes long.

In the magic bottle, a vacuum double bottle 1 is housed in an exterior body, and a liquid is contained in the vacuum double bottle 1, but a tip tube 5 protrudes from the bottom of the vacuum double bottle 1. As a result, the lower part of the magic bottle, which corresponds to the length of the tip tube 5, was not used at all to store the liquid inside, and thus became a meaningless part. Therefore, vacuum double bottle 1
The presence of the tip tube 5 in the bottle is an impediment to making the magic bottle more compact, and it has been desired to make the tip tube 5 as short as possible.

In the conventional vacuum double bottle 1, for the reasons mentioned above, the tip tube 5 is connected from the lowest part of the outer bottle 3.
The protrusion height a to the tip of the
Approximately 24 mm is required, and in the case of continuous mechanical manufacturing, it was virtually impossible to set the thickness to 27 mm or less, taking into account variations during manufacturing.

Attempts have also been made to reduce the height of protrusion from the lowest part of the outer bottle 3 by forming the tip tube 5 at a position away from the center of the bottom of the outer bottle 3.
Even so, it is impossible to prevent the tip of the tip tube 5 from protruding beyond the lowest part of the outer bottle 3, and it is extremely difficult to provide the tip tube 5 at a position away from the center of the outer bottle 3.

The present invention was developed in view of the above circumstances, and the object thereof is to significantly reduce the height of the protrusion from the lowest part of the outer bottle 3 to the tip of the tip tube 5.

Means for solving the problem The present invention consists of an inner bottle and an outer bottle made of glass, the gap between the inner bottle and the outer bottle is made a vacuum, and a part of the outer bottle has an outer diameter of 6 to 8 mm. , wall thickness 0.5~1
This product is characterized by being made by welding a 3.0 mm chip tube and sealing it.

That is, in the present invention, the outer diameter of the tip tube 5 is slightly smaller than that in the conventional vacuum double bottle 1. Although it is expected to some extent that if the diameter of the tip tube 5 is made smaller, the protrusion height after melting will be reduced, the experimental results show that the protrusion height greatly exceeds that prediction. We have discovered that it is possible to reduce the

The chip tube 5 in the present invention has an outer diameter of 6 to 6.
It needs to be 8mm. Although it is possible to further reduce the protrusion height if it is less than 6 mm, it is difficult to inject or drain the plating liquid into the gap 4 between the inner bottle 2 and the outer bottle 3 during the manufacturing process of the vacuum double bottle 1. This is not preferable because it is difficult to evacuate the space 4 and it takes a long time to evacuate the space 4 to create a vacuum. Moreover, if it exceeds 8 mm, the effect of the invention will be reduced.

Further, the wall thickness of the chip tube 5 may be approximately the same as that of the conventional one, but it is desirable that it be slightly thinner. However, if it is less than 0.5 mm, the tip tube 5
strength is insufficient.

Operation FIG. 2 shows the process of welding the tip tube 5 to the outer bottle 3 and the process of sealing the tip tube 5 in the present invention.

In the present invention, since the diameter of the tip tube 5 is small, the diameter of the hole 6 formed in the bottom of the outer bottle 3 for welding the tip tube 5 can be small.
Therefore, since the amount of glass in the hole 6 is small and the amount of glass gathered around the hole 6 is small, the second
As shown in Figure a, the thickness of the thick portion 7 formed around the hole 6 does not become excessively thick unlike the conventional one.

In addition, since the thickness of the thick wall portion 7 is not excessively thick, the wall thickness of the thick wall portion 7 can be made uniform by simply pulling down the tip tube 5 slightly after welding the tip tube 5 there. As a result, the bulge 8 formed in the outer bottle 3 has a small diameter and height, as shown in FIG. 2b.

Furthermore, since the tip tube 5 is thin, the tip tube 5
The amount of heat required to melt is smaller than that of conventional methods. Therefore, the chip tube 5 can be melted and sealed by applying a small amount of gas for a short time, and the thermal radiation of the burner 9 has little thermal influence on the outer bottle 3 and the bulging portion 8. Therefore, the burner 9 can be positioned closer to the outer bottle 3 than in the conventional case, and the length of the tip tube 5 can be significantly shortened.

Effects of the invention According to the invention, the height of the swollen portion 8 is low, the length from the swollen portion 8 to the welding position of the tip tube 5 can be shortened, and furthermore, the tip tube is Since it is thin, the length of the sealed portion can be shortened accordingly, so the protruding height from the lowest position of the bottom of the outer bottle 3 to the tip of the tip tube 5 can be made much shorter. . As a result of experiments, the protruding height a of the tip tube 5 can be set to about 15 to 16 mm, and even in the case of mechanically manufacturing a vacuum double bottle, it can be set to 17 mm or less. In particular, according to the present invention, the thick portion 7 is thin and the bulging portion 8 can be made small.
There is little variation in the protrusion height. Therefore, even in the case of mechanization, the tip tube 5 can be sealed at a position sufficiently close to the bulge 8.

As described above, according to the present invention, even when the tip tube 5 is provided in the center of the outer bottle 3, it is possible to reduce the protruding height of the tip tube 5 by 10 mm or more,
Even with the same capacity, the magic bottle can be made much more compact. Furthermore, if the tip tube 5 is provided near the edge of the bottom of the outer bottle 3 away from the center, it is possible to prevent it from protruding from the lowest part of the outer bottle 3, resulting in an extremely compact magic bottle. be able to.

Furthermore, the silver plating on the inner surface of the tip tube 5 of the vacuum double bottle is peeled off when it is heated during melting, which reduces the insulation effect of the vacuum double bottle, even if only slightly, but according to the present invention, the tip tube 5 Because it is thin, the area where the silver plating peels off is small, and the insulation effect is improved.

In general, if the glass tube becomes thinner, the fused portion can be made smaller, and it was expected that the protruding height of the tip tube 5 could be reduced by about 1 to 2 mm, but the experimental results showed that However, it was possible to make it much wider and shorter, and it was extremely effective in making compact magic bottles.

[Brief explanation of drawings]

FIG. 1 is a central vertical sectional view of the vacuum double bottle.
FIG. 2 is an enlarged central vertical cross-sectional view of the main parts of the vacuum double bottle of the present invention showing the steps of welding the tip tube 5 to the outer bottle 3 and the step of melting the tip tube 5, and FIG. The process of welding the tip tube 5 to the outer bottle 3 and the tip tube 5 in a conventional vacuum double bottle
FIG. 3 is an enlarged central vertical cross-sectional view of the main part showing the process of melting the . 1...Vacuum double bottle, 2...Inner bottle, 3...Outer bottle, 4...Gap, 5...Tip tube.

Claims (1)

[Scope of utility model registration request] It consists of an inner bottle 2 and an outer bottle 3 made of glass, the gap 4 between the inner bottle 2 and the outer bottle 3 is made a vacuum, and a part of the outer bottle 3 has an outer diameter of 6 to 8 mm and a wall thickness of 0.5 to 1 mm. A glass vacuum double bottle characterized in that a chip tube 5 is welded and then sealed.