JP2001231693A - Thermally insulated vessel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thermally insulated vessel using a metal vacuum double- wall bottle having an opening smaller in inner diameter than its body, which is more excellent in heat retaining property and prevented from corrosion (rust formation) at the inner barrel of the vacuum double-wall bottle. SOLUTION: The thermally insulated vessel additionally comprises an internal container 2 inside a metal vacuum double-wall bottle 1 along the inner barrel 1a thereof. The inner vessel 2 made of a synthetic resin, which is smaller in coefficient of thermal conductivity than the inner barrel, can be formed by blow molding with the inner barrel 1a as a mold. A gap 3 maintained between the inner barrel 1a and the inner vessel 2 can improve the insulating effect since air in the gap 3 serves as an insulating layer. The material constituting the inner vessel can be changed according to its contents.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a metal vacuum double bottle thermal insulation container mainly used as a liquid thermal insulation container such as a vacuum bottle.

[0002]

2. Description of the Related Art Vacuum double bottles made of metal are used not only as liquid heat containers such as portable vacuum bottles, but also as heat containers for various applications because of their excellent strength and excellent heat insulation performance. Have been. Of these insulated containers using vacuum double bottles made of metal, those that mainly contain liquids are:
The inner diameter of the opening is smaller than the inner diameter of the body so that the amount of heat radiation from the opening can be reduced as much as possible. In the conventional metal vacuum double bottle, the inner body of the vacuum double bottle is used as it is as a storage portion of the heat insulation container.

[0003]

As a result of studying the heat radiation mechanism in order to further improve the heat retaining performance of a metal vacuum double bottle, part of the heat of the stored material is transmitted through the inner body by heat conduction and the outer body. It has been found that the heat reaches the upper end, which is a continuous portion with the outer shell, and is dissipated from the opening.

An object of the present invention is to reduce the amount of heat radiation by the above-mentioned mechanism and to provide a heat insulation container having more excellent heat insulation efficiency. Conventionally, the contents are housed in the inner body of the metal vacuum double bottle itself, but depending on the type of the contents, corrosion of the inner body and deterioration of the contents may occur. Another object of the present invention is to realize a structure of a heat insulating container capable of avoiding corrosion of the inner body of the above-described metal vacuum double bottle, and furthermore, generation of perforations (leakage) due to the corrosion and deterioration of the contained material. That is.

[0005]

In order to achieve the above object, according to the present invention, there is provided a heat insulation container using a metal vacuum double bottle 1 in which the inner diameter of an opening is smaller than the inner diameter of a body. , An inner container 2 different from the vacuum double bottle is arranged inside the vacuum double bottle 1 along the inner body 1a. Vacuum double bottle 1
As a specific method of arranging the inner container 2 in the inside, a synthetic resin material having a smaller thermal conductivity than the metal constituting the vacuum double bottle is used, and the inner body 1a of the completed vacuum double bottle is formed as a mold. After being formed by the blow molding method, the opening portion can be finished by performing finishing processing.

When a certain gap 3 is held between the inner cylinder 1a of the vacuum double bottle 1 and the inner container 2, the air in the gap 3 functions as an air insulating layer, and the heat of the contents is transferred to the vacuum double bottle. 1 inner trunk
The amount of heat transmitted to 1a can be reduced. Further, by forming the inner container 2 with a material having excellent corrosion resistance, problems such as corrosion of the inner body 1a of the vacuum double bottle and deterioration of the contents can be solved.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an embodiment of a heat insulating container of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a longitudinal sectional view showing an embodiment in which the present invention is applied to a portable vacuum bottle,
FIG. 2 is a half cross-sectional perspective view of only the upper end of the vacuum double bottle having an inner container formed therein in the portable vacuum bottle of FIG.
4 and 4 are longitudinal sectional views showing an example of the inner structure of the vacuum double bottle and the bottom structure of the inner container, respectively.

In the portable vacuum bottle shown in FIG. 1, a bottom body 5 is attached to the lower end of a vacuum double bottle 1 made of metal, and a shoulder member 6 is attached to an upper end thereof. A stopper 7 for closing the opening of the vacuum double bottle 1 and a cap 8 for covering the outside thereof are detachably screwed to the shoulder member 6 while being supported. The metal vacuum double bottle used for this portable vacuum bottle is formed by joining the inner body 1a and the outer body 1b at the upper end and integrating them to form a vacuum space 4 between the inner body 1a and the outer body 1b.
The inner diameter of the upper end opening of the inner trunk 1a is formed to be smaller than the inner diameter of the trunk of the inner trunk.

Inside the vacuum double bottle 1, an inner container 2 having a shape along the inner surface of the inner body 1a is arranged. The upper end of the inner container 2 protrudes from the upper end of the vacuum double bottle, and the protruding portion is bent outward to form an outer flange-shaped bent portion 2a to cover the upper end of the vacuum double bottle. A packing 9 having a substantially U-shaped cross section is provided on the portion 2a.
Is installed. As shown in FIG. 1, the bent portion 2a of the inner container 2
The lower surface is supported by the upper end of the vacuum double bottle 1 via the packing 9, and the upper surface of the bent portion 2 a is pressed and supported by the shoulder member 6 via the packing 9. In other words, the bent portion 2a of the inner container 2 to which the packing 9 is attached is firmly fixed by being sandwiched between the upper end of the vacuum double bottle and the shoulder member 6.

The shoulder member 6 is fixed to the outer barrel 1b of the vacuum double bottle 1 by fitting the concave and convex of the locking portion 10, and the lower end of the outer barrel 1b of the vacuum double bottle 1 is The bottom body 5 is fixed by the concave-convex fitting. A stopper 7 is detachably screwed into the upper end opening of the shoulder member 6 so that the packing 12 attached to the outer peripheral portion of the distal end of the stopper 7 comes into contact with the constricted portion 2b of the inner container 2 and can be sealed. Further, the inside of the stopper 7 is filled with a heat insulating material so that the heat retaining effect as a vacuum bottle does not deteriorate.

The inner container 2 can be arranged inside the vacuum double bottle 1 by molding inside the inner body having a narrowed opening. The molding method is not particularly limited. For example, it is conceivable that a split mold is inserted into the inner barrel 1a, a molding material is injected between the split mold and the inner barrel 1a, or a synthetic resin material is injected. However, the present inventors propose a method of molding an inner container by a blow molding method using the inner barrel 1a as a mold as the most effective method.

That is, a parison is inserted into the inner cylinder 1a of the completed vacuum double bottle and expanded by compressed air to complete the inner container 2 having a shape along the inner surface of the inner cylinder 1a. The synthetic resin material used for molding the inner container 2 is as follows.
A material having a thermal conductivity smaller than that of at least the metal constituting the vacuum double bottle 1 is used. For example, it is preferable to mold with a polypropylene resin, a polyethylene resin, a pet resin, or the like.

The inner container 2 disposed inside the inner body 1a may be molded without any gaps on the inner surface of the inner body 1a. However, it is preferable to form a small gap 3 between the inner body 1a and the inner surface of the inner body 1a. preferable.
By forming this gap, the air in the gap functions as a heat insulating layer, and the amount of heat transmitted to the inner body 1a can be reduced as much as possible. In order to form a gap between the inner body 1a and the inner container 2, the inner container 2 is shrunk by blowing and cooling the inner container at a certain high temperature, and the gap is naturally formed as a whole. The gap between the inner body 1a and the inner container 2 does not need to be large, and is, for example, 1 mm or less. The upper end of the inner container 2 is made to protrude from the upper end of the vacuum double bottle 1, and after forming the inner container, the diameter is expanded outward to form a bent portion 2a having an outer flange shape.

The material of the inner container arranged inside the inner container is as follows.
By being formed of a material with excellent corrosion resistance such as acid resistance and alkali resistance, it is no longer limited to what is stored in the thermal insulation container, for example, when used as a thermal insulation container for beverages like a portable vacuum bottle Even if a beverage such as juice, soup, or miso soup is stored, there is no possibility that the inner barrel 1a of the vacuum double bottle is corroded. Of course, the present invention can be applied to a container for storing things other than beverages as a heat retaining container, and to a container for storing not only liquids but also powders and granules as contents.

FIGS. 3 and 4 are longitudinal sectional views showing an example of the bottom shape of the inner cylinder 1a and the inner container 2 of the vacuum double bottle. FIG.
The embodiment shown in FIG. 4 has a flat bottom surface, and FIG. 4 shows a curved surface bulging from bottom to top. By using the bottom shape shown in FIG. 3 or FIG. 4, a large internal pressure is applied to the inner container 2 as shown by arrows in FIG. 3 (b) and FIG. 4 (b).
Is deformed, a part of the bottom surface of the inner container 2 comes into contact with the bottom surface of the inner body 1a, and damage to the inner container can be avoided. As a situation in which a large internal pressure acts on the inner container, for example, a case in which a portable magic drop is performed may be considered.

In a conventional vacuum double bottle without an inner container, the heat of the contents is directly transmitted to the inner cylinder 1a, and the heat is transmitted from the continuous portion at the upper end to the outer cylinder 1b to be radiated outside the container. Further, since the upper end portion of the inner body often comes into contact with the outside air, heat is also radiated from here. On the other hand, in the heat retaining container of the present invention, the heat of the contents needs to be transmitted to the inner body via the inner container, and the amount of heat released outside the container can be reduced. In particular, if the inner container is made of a synthetic resin material with low thermal conductivity, the amount of heat transfer will decrease accordingly, and the inner body 1a
When a gap is held between the inner container 2 and the inner container 2, the air in the gap functions as a heat insulating layer. Further, heat is hardly transmitted to the upper end portion of the inner container which is likely to come into contact with the outside air, the amount of heat radiated from this portion can be reduced, and the heat retaining effect can be improved as a whole.

The material of the inner container is not particularly limited. However, if the inner container is formed of a synthetic resin material having excellent corrosion resistance, even an acidic or alkaline strongly corrosive material can be accommodated. The present invention can also be applied to an insulated container for storing, for example, a chemical substance other than a beverage in an inner container. In this case, the material of the inner container may be selected according to the substance to be contained.

[0018]

According to the thermal insulation container of the present invention, the inner container is disposed inside the inner body of the metal vacuum double bottle, so that the heat transferred from the inner body to the outer body is reduced. And the heat retention effect can be improved. In addition, the material of the inner container can be selected in accordance with the properties of the one contained in the heat retaining container.

According to the second aspect of the present invention, the inner container is made of a synthetic resin material while using a metal vacuum double bottle in which the inner diameter of the opening is smaller than the inner diameter of the body. It can be easily formed. Then, by molding the inner container using a synthetic resin material having a small thermal conductivity, it is possible to achieve a higher heat retaining effect.

According to the third aspect of the present invention, by maintaining a gap between the inner cylinder and the inner container of the vacuum double bottle,
The air in the gap functions as a heat insulating layer, and can have a higher heat retaining effect.

According to the fourth aspect of the present invention, the inner container is formed of a synthetic resin material having excellent corrosion resistance, so that the inner container can be housed in a heat insulating container using a conventional vacuum double bottle made of metal. In addition to being able to store what could not be done, when used as an insulated container for beverages, it prevents adverse effects such as deterioration of the contents due to corrosion of the inner container and protects the inner body of the metal vacuum double bottle There is also an effect that can be.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment in which a heat retaining container of the present invention is applied to a portable vacuum bottle.

FIG. 2 is a half cross-sectional perspective view of only the upper end of the vacuum double bottle with an inner container disposed therein, according to the embodiment shown in FIG. 1;

FIG. 3 is a cross-sectional view showing an example of the inner barrel of a vacuum double bottle and the bottom of an inner container.

FIG. 4 is a cross-sectional view illustrating another bottom shape of the inner body and the inner container of the vacuum double bottle.

[Explanation of symbols]

1 ... vacuum double bottle, 1a ... inner body, 1b ... outer body, 2 ...
Inner container, 2a… bending part, 2b… constriction part, 3… gap,
4 ... vacuum space, 5 ... bottom, 6 ... shoulder member, 7 ... plug,
8 ... Cap, 9 ... Packing, 10 ... Locking part, 11 ...
Locking part, 12 ... packing.

Claims (4)

[Claims] In a heat insulation container using a metal vacuum double bottle in which the inner diameter of the opening is smaller than the inner diameter of the body, the vacuum double bottle is provided inside the vacuum double bottle along the inner body. An insulated container characterized by having an inner container separate from the bottle. 2. An inner container arranged inside a vacuum double bottle,
2. The thermal insulation container according to claim 1, wherein a synthetic resin material having a lower thermal conductivity than the metal constituting the vacuum double bottle is used, and the inner body of the vacuum double bottle is molded by a blow molding method as a mold. 3. The thermal insulation container according to claim 1, wherein a gap is held between an inner body of the vacuum double bottle and an inner container arranged inside the vacuum double bottle. 4. The thermal insulation container according to claim 1, wherein the inner container disposed inside the vacuum double bottle is formed of a material having excellent corrosion resistance.