JPH08336469A - Vacuum double vessel - Google Patents

Abstract

PURPOSE: To provide a vacuum double vessel which can take a larger volume with the same external shape by setting a gap between the inner bottle and the outer bottle within the elastic deformation limit of the outer vessel against the load in the radial direction and as small as possible so as not to touch. CONSTITUTION: An inner bottom 15 with a protrusion part 16 and a dent part 17 is inserted into a step part 14 formed by expanding the diameter of the lower end of an inner barrel 13 and welded to bond both. A groove part 19 in the inside of the outer periphery protruding downward is formed on an outer bottom of an outer bottle 12, two of step parts 20a and 20b are formed on the sidewall of the groove part 19 toward the center, and a protruding part 21a protruding from the step part 20b outward to the center is formed. The outer periphery circumference of the outer bottom 18 is inserted into the lower end of the outer barrel 22 and welded to join both, a gap between the inner bottle 11 and the outer bottle 12 is set within the range of the elastic deformation of the outer bottle 12 as small as possible to the extent that the inner bottle 11 and the outer bottle 12 are not brought in contact with each other.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a portable vacuum double container.

[0002]

2. Description of the Prior Art In a vacuum double container in which a vacuum is applied between the inner bottle and the outer bottle, when the inner bottle comes into contact with the outer bottle, heat flows out from the contact portion, so that there is a gap between the inner bottle and the outer bottle. There is a constant gap. Conventionally, the gap between the inner bottle and the outer bottle has been empirically determined. For example, in order not to contact the inner bottle and the outer bottle in the manufacturing process, or to prevent the outer bottle from contacting the inner bottle even if the outer bottle is normally dented during use, for example, in a thermos bottle having an outer diameter of about 80 mm, the inner bottle is The gap between the outer bottle and the outer bottle is about 4 to 5 mm.

[0003]

As described above, since the conventional vacuum double container has a relatively large gap between the inner bottle and the outer bottle, the diameter of the outer bottle becomes large, which is larger than the outer size. Therefore, there is a problem that the capacity is small, the external dimensions are large even with the same capacity, and the capacity is heavy for the capacity. An object of the present invention is to solve such a problem, and an object thereof is to provide a compact vacuum double container in which the gap between the inner bottle and the outer bottle is as small as possible.

[0004]

Means for Solving the Problems As a result of intensive studies conducted by the present inventors, the contact between the inner bottle and the outer bottle caused in the manufacturing process can be solved by improving the manufacturing technique. , The gap between the inner bottle and the outer bottle is determined so that the outer bottle does not plastically deform and come into contact with the inner bottle due to external force such as shock or vibration that can occur when the vacuum double container is used. Guessed it should be done. Therefore, the inventors of the present invention carried out a pressing test in which a vacuum double container 1 placed horizontally is pressed by a wedge-shaped press 2 in a radial direction as shown in FIG. A test was conducted to measure the deformed state of the container.

The dashed-dotted line in FIG. 3 shows a change curve of the load and the deformation amount obtained by the pressing experiment of the conventional vacuum double container 1. According to this figure, the vacuum double container 1 is pressed from the point O.
As the outer bottle is deformed, the load increases, and the load abruptly increases from the point A ′ where the outer bottle contacts the inner bottle. When the pressure applied by the press is removed from the point B ', the deformation hardly recovers even if the load sharply decreases, and the amount of plastic deformation indicated by OC' remains. This plastic deformation causes the outer bottle to have a dent 3 as shown in FIG. 2 and to be in contact with the inner bottle. On the other hand, according to the drop test, it was confirmed that in the conventional vacuum double container 1, the outer bottle was plastically deformed to have an elliptical cross section and contacted with the inner bottle.

According to the present invention, the above-mentioned test is repeated by changing the gap between the inner bottle and the outer bottle and the wall thickness of the outer bottle, and the condition that the outer bottle is not dented or deformed in an elliptical shape as described above is obtained. It was recollected as a result of examination. That is, in the present invention, in a portable vacuum double container in which a vacuum is applied between the inner bottle and the outer bottle, the gap between the inner bottle and the outer bottle is within the range of elastic deformation of the outer bottle against a radial load. In addition, it is made as small as possible without touching. The gap between the inner bottle and the outer bottle is preferably 2 mm.

[0007]

In this way, when the vacuum double container having the gap between the inner bottle and the outer bottle within the elastic deformation range of the outer bottle is pressed by the above-mentioned press, the solid line in FIG. As indicated by the load-deformation amount curve indicated by, the outer bottle contacts the inner bottle at point A within the elastic deformation range. After that, since the strength of the container is about doubled, the deformation is reduced and remains within the elastic deformation range even under the normal load at the point B. Therefore, when the pressing force from the point B is removed, the outer bottle separates from the inner bottle at point C and recovers to point D near the origin O.

Here, a small amount of OD of plastic deformation remains, which is considered to be local plastic deformation due to a sharp wedge-shaped press, and the vacuum double container is used in a normal state. It doesn't happen. Thus, in the vacuum double container according to the present invention, even if an external force that may occur during use such as impact or vibration is applied, the outer bottle does not undergo plastic deformation, so that there is no contact between the outer bottle and the inner bottle. , The heat retention is maintained.

[0009]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 4 shows a thermos bottle 10 according to the present invention, in which 11 is an inner bottle and 12 is an outer bottle, both of which are made of stainless steel. The inner bottle 11 is obtained by fitting an inner bottom 15 to a step portion 14 formed by expanding the lower end of the inner body 13 and welding and joining it. The inner bottom 15 has a protrusion 1 that is pushed outward.
6 and a recess 17 in which the central portion of the protrusion 16 is pushed inward.

On the outer bottom 18 of the outer bottle 12, a groove portion 19 is formed inside the outer peripheral edge projecting downward. Further, two steps 20a and 20b are formed from the side wall of the groove 19 toward the center of the outer bottom 18, and the step 20 is formed.
Initially, a projecting portion 21a projecting outwardly from b toward the center is formed as shown by a chain double-dashed line. The outer peripheral edge of the outer bottom 18 is fitted and welded to the lower end of the outer case 22. The inner bottle 11 is the outer bottom 18 of the outer bottle 12.
Is welded to the outer case 22 before being welded to the outer case 22,
The mouth portion 23 is welded to the mouth portion 24 of the outer bottle.

A ring-shaped steady metal fitting 25 is fitted to the protruding portion 16 of the inner bottom 15 of the inner bottle 11, and the lower end of the steady metal fitting 25 is close to the inner surface of the side wall of the groove portion 19 of the outer bottle 12. The joint portion of the mouth portions 23 and 24 is protected against the shake of the inner bottle 11. In addition, the steady rest 25 includes the mouth portion 23,
It may be omitted if the strength of the joint portion of 24 is sufficiently secured. A space between the inner bottle 11 and the outer bottle 12 is vacuum-exhausted through a tip tube 26 attached to the protruding portion 21a, and the tip tube 26 is closed to be vacuum-sealed. The protruding portion 21 a of the outer bottom 18 is pushed inward after the tip tube 26 is closed to form a concave portion 21. In addition, 2
Reference numeral 7 is an aluminum foil that blocks radiant heat from the inner bottle 11.

The elasticity of the outer bottle 12 with respect to the radial load is determined by the wall thickness t, the outer diameter D, the height H and the material of the outer case 22. The gap C between the inner bottle 11 and the outer bottle 12 is
Within the range of elastic deformation of the outer bottle 12, it is set as small as possible so that the inner bottle 11 and the outer bottle 12 do not come into contact with each other. Table 1 shows a preferred embodiment in which the roundness of the inner bottle 11 and the outer bottle 12 at the time of manufacture and distortion at the time of welding are taken into consideration.

[Table 1] Gap C (mm) Thickness t (mm) Outer diameter D (mm) Height H (mm) 2 0.3 82 132.5 3 0.4 0.4 100 200.0

In the thermos bottle of this embodiment, even if an external force that may normally occur acts in the radial direction, as described above, the outer bottle 12
After contacting the inner bottle 11 within the elastic deformation range, the strength is approximately doubled and the deformation is suppressed within the elastic range, so that the initial state is restored without causing plastic deformation. Also,
For example, in a thermos bottle having an outer diameter D of 82 mm, the gap C between the inner bottle 11 and the outer bottle 12 is 2 mm, which is half that of the conventional thermos bottle of the same size which is 4 mm. Therefore, it has a small outer diameter D and is compact and lightweight even with the same capacity as the conventional one.

The outer bottle 12 of the above-mentioned embodiment is formed by welding and joining the outer bottom 18 to the outer body 22 which is integrally formed with the shoulder portion. It may be joined to the body made of.

[0015]

As is apparent from the above description, according to the present invention, since the gap between the inner bottle and the outer bottle is within the elastic deformation range of the outer bottle, it is as small as possible. Can be made large, and conversely, even with the same capacity, the external shape can be made small or the height can be made small to make it compact. Further, the outer bottle is elastically deformed by the load in the radial direction and comes into contact with the inner bottle, and the outer bottle and the inner bottle can oppose the load, and thus the strength of the container is much higher than that of the conventional one. Have

[Brief description of drawings]

FIG. 1 is a front view showing a state of a pressing test.

FIG. 2 is a perspective view showing a plastically deformed state of the outer bottle.

FIG. 3 is a diagram showing a load-deformation amount curve in a pressure test of a vacuum double container according to the related art and the present invention.

FIG. 4 is a sectional view of a vacuum double container according to the present invention.

[Explanation of symbols]

 10 ... Thermos bottle, 11 ... Inner bottle, 12 ... Outer bottle, C ... Gap.

Claims (2)

[Claims] 1. In a portable vacuum double container in which a vacuum is applied between the inner bottle and the outer bottle, a gap between the inner bottle and the outer bottle is set within a range of elastic deformation of the outer bottle against a radial load. ,And,
A portable vacuum double container characterized by being made as small as possible without contact. 2. A portable vacuum double container characterized in that the gap between the inner bottle and the outer bottle is 2 mm.