JP7179577B2 - Insulated double container and its manufacturing method - Google Patents

Description

TECHNICAL FIELD The present invention relates to an insulated double container such as a double structure portable thermos bottle, a desk thermos bottle, a mug cup, a soup cup, a lunch jar, etc., and a method for manufacturing the same.

Conventionally, the structure of the vacuum double container disclosed in Patent Document 1 is known as the structure of the heat insulating double container. In this vacuum double container, an inwardly bent folded portion that is U-shaped in cross section is formed at the tip of the mouth portion of the outer container, and an enlarged diameter portion is formed at the mouth portion of the inner container. The distal end portion of the folded portion of the outer container and the enlarged diameter portion of the inner container are fitted to a position where the distal end edge of the distal end portion of the portion abuts the base of the expanded diameter portion of the inner container, and the distal end portion of the folded portion of the outer container is fitted. The periphery of the portion where the tip edge and the root of the expanded diameter portion of the inner container abut is fixed by laser welding.

Japanese Unexamined Patent Application Publication No. 2014-110

By the way, the vacuum double container of Patent Document 1 is manufactured by fitting the enlarged diameter portion of the inner container to the outside of the distal end portion of the U-shaped folded portion of the outer container when viewed in cross section. Since the tip of the folded portion that overlaps tends to spring back inward, in order to stably manufacture, press the tip of the folded portion outward with a jig while pressing the tip of the folded portion. It is necessary to fit the enlarged-diameter portion of the inner container to the outside of the container, and laser-weld the vicinity of the portion where the tip edge of the tip of the folded portion of the outer container and the base of the enlarged-diameter portion of the inner container abut against each other. That is, in order to maintain the shape of the tip of the folded portion in the manufacturing process and to perform accurate fitting and high-precision welding, a jig for holding the tip of the folded portion is essential. In addition, the use of such jigs increases the cost of manufacturing equipment.

The present invention is proposed in view of the above problems, and when manufacturing a heat-insulating double container in which a folded portion is provided at the tip of the mouth portion of the outer container, a jig for holding the shape of the tip of the folded portion is provided. An insulated double container capable of reducing the manufacturing cost and capable of performing accurate fitting work and high-precision welding work between the cylindrical body constituting the outer container and the mouth of the inner container even without it, and its manufacture The purpose is to provide a method.

The heat-insulating double container of the present invention is formed by deforming a thin-walled tubular member, in which a heat-insulating layer is provided between a substantially bottomed cylindrical inner container made of metal and a substantially bottomed cylindrical metal outer container. A folded portion folded inward is formed at the leading end of the mouth portion of the outer container, the hanging portion extending downward from the lower end of the folded portion, and the root portion bending outward from the lower end of the hanging portion. , an enlarged diameter portion extending downward from the outer end of the root portion is provided, the folded portion has a small rounded portion formed at the tip thereof, and an inclined portion inclined inwardly downward from the inner end of the small rounded portion. The inner container is formed in such a shape that the hanging portion is bent from the lower end of the inclined portion and extends downward, and the tip edge of the mouth portion of the inner container is substantially in contact with the root portion. is fitted inside the enlarged diameter portion, and the inner container and the outer container are welded around the leading edge of the mouth of the inner container.
According to this, by providing the drooping portion, the base portion, and the enlarged diameter portion on the tip side of the folded portion, the shape of the tip side of the folded portion can be stabilized at a predetermined position, and springback can be prevented. The shape of the distal end side of the folded portion with high stability is such that the distal edge of the mouth portion of the inner container substantially abuts against the root portion of the cylindrical body constituting the outer container without a jig for retaining the shape. The operation of fitting the tip of the mouth of the inner container to the inside of the enlarged diameter part of the cylindrical body constituting the outer container, and the inner container and the outer container are configured around the tip edge of the mouth of the inner container. Allows the operation of welding the cylinder. That is, even if there is no jig for holding the shape of the tip of the folded portion, it is possible to perform accurate fitting work and high-precision welding work between the cylindrical body constituting the outer container and the opening of the inner container. Moreover, since it is possible to manufacture without using a jig for holding the shape of the distal end of the folded portion, the manufacturing cost can be reduced. In addition, by bending from the lower end of the inclined part of the folded part and extending the drooping part downward, and by providing a root part and an enlarged diameter part that bend from this drooping part, the shape of the tip side of the folded part can be adjusted with higher stability. It can be stabilized in place. Therefore, it is possible to further improve the accuracy of the fitting work and the welding work between the cylinder constituting the outer container and the opening of the inner container. Further, when the heat insulating double container is used as a container for storing liquid such as a portable thermos bottle, the small rounded portion can improve liquid drainage.

The heat-insulating double container of the present invention is formed by deforming a thin-walled tubular member, in which a heat-insulating layer is provided between a substantially bottomed cylindrical inner container made of metal and a substantially bottomed cylindrical metal outer container. A substantially U-shaped folded portion folded inward is formed at the leading end of the mouth portion of the outer container, and a hanging portion extending downward from the lower end of the folded portion and bent outward from the lower end of the hanging portion and a diameter-enlarged portion extending downward from the outer end of the root portion. A portion is fitted inside the enlarged diameter portion, and the inner container and the outer container are welded around the tip edge of the mouth portion of the inner container.

The heat-insulating double container of the present invention is characterized in that the root portion is formed to extend substantially horizontally outward, and the enlarged diameter portion is formed to extend substantially vertically downward with a tendency to open outward. and
According to this, since the tip end edge of the mouth portion of the inner container can be substantially abutted against the base portion extending substantially horizontally, the positioning of the outer container or the cylinder constituting the outer container and the inner container can be performed more easily and accurately. can be done. Further, by extending the enlarged-diameter portion substantially vertically downward with a tendency to open outward, the operation of fitting the tip of the mouth portion of the inner container to the inside of the enlarged-diameter portion of the cylindrical body constituting the outer container can be facilitated. It can be done smoothly.

The method for manufacturing the insulated double container of the present invention is a method for manufacturing the insulated double container of the present invention, comprising: The inner container is inserted from the bottom side into the cylindrical body provided with the enlarged diameter portion, and the tip end edge of the mouth portion of the inner container is substantially abutted against the base portion of the cylindrical body. A first step of fitting the tip of the mouth portion of the container inside the enlarged diameter portion, and a second step of welding the inner container and the cylindrical body around the tip edge of the mouth portion of the inner container. It is characterized by
According to this, even if there is no jig for holding the shape of the tip side of the folded portion, the cylindrical body constituting the outer container and the inner container can be easily positioned at accurate positions and welded securely.

According to the present invention, when manufacturing a heat-insulating double container in which a folded portion is provided at the tip of the mouth portion of the outer container, the outer container can be constructed without a jig for holding the shape of the tip of the folded portion. Accurate fitting work and high-precision welding work can be performed between the opening of the cylindrical body and the inner container, and the manufacturing cost of the heat insulating double container can be reduced.

The front view which shows the heat insulation double container of embodiment by this invention. FIG. 2 is a longitudinal sectional view showing the heat insulating double container of the embodiment; The partial enlarged view which shows the periphery of the folding|folding part in the heat insulation double container of embodiment. Explanatory drawing explaining the process of inserting an inner container in the cylindrical body which comprises an outer container in the manufacturing process of the heat insulation double container of embodiment. Explanatory drawing explaining the process of fitting and welding an inner container to the cylinder which comprises an outer container in the manufacturing process of the heat insulation double container of embodiment. FIG. 6 is a partially enlarged explanatory view showing the periphery of the container mouth in FIG. 5;

[Insulated double container of the embodiment and its manufacturing method]
A heat insulating double container 1 according to an embodiment of the present invention is used as a portable thermos bottle or the like, and as shown in FIGS. It has a cylindrical outer container 3 made of metal, a space is provided between the inner container 2 and the outer container 3, and this space serves as a heat insulating layer 4. - 特許庁The heat insulating layer 4 in the first embodiment is a vacuum heat insulating layer in which the space between the inner container 2 and the outer container 3 is in a vacuum state or a reduced pressure state, but the space between the inner container 2 and the outer container 3 is A vacuum insulation layer provided with a heat insulation material is provided by applying a heat insulation layer of an air layer in the state of atmospheric pressure, or by applying metal foil such as copper or aluminum to the outer surface of the inner container 2 or the inner surface of the outer container 3. is also possible. A lid 10 closes the mouth of the heat insulating double container 1 .

The inner container 2 is composed of a mouth portion 21 on the opening side, a cylindrical body portion 22 and a bottom portion 23 . A tip portion 211 of the mouth portion 21 of the inner container 2 is formed to extend substantially vertically upward and is provided to reach a circumferential tip edge 2111 . An inner container tapered portion 221 whose diameter gradually increases toward the bottom portion 23 of the inner container 2 is provided at the lower portion of the body portion 22 of the inner container 2 .

The entire inner container 2 is made of a thin material having substantially the same thickness. In addition, the bottom portion 23 is formed by deforming a single thin plate material by press working or the like, and the lower end edge of the cylinder constituting the mouth portion 21 and the body portion 22 is the substantially dish-shaped bottom portion 23 . It is formed by butting against the upper edge and joining by welding or the like. In addition, members constituting the mouth portion 21, body portion 22, and bottom portion 23 of the inner container 2 or subdivided portions thereof are formed, and these members are joined by welding or the like to form the inner container 2. Alternatively, from the viewpoint of reducing manufacturing costs and improving manufacturing efficiency, the mouth portion 21, body portion 22, and bottom portion 23 of the inner container 2 are formed by deforming a single thin plate material by press working or the like. may

The outer container 3 is composed of a mouth portion 31 on the opening side, a cylindrical body portion 32 and a bottom portion 33 . A tip portion 311 of the mouth portion 31 of the outer container 3 is formed with a folded portion 312 that is folded back inward. there is The folded portion 312 of the present embodiment has a small rounded portion 3121 formed at the tip, and an inclined portion 3122 that slopes downward and inward from the inner end of the small rounded portion 3121 is formed. The outer diameter of the small rounded portion 3121 is preferably 0.9 mm to 1.2 mm from the viewpoint of good liquid drainage when liquid is contained in the heat insulating double container 1 .

The mouth portion 31 of the outer container 3 includes a hanging portion 313 extending downward from the lower end of the folded portion 312 , a root portion 314 bending outward from the lower end of the hanging portion 313 , and a root portion 314 extending downward from the outer end of the root portion 314 . An enlarged diameter portion 315 is provided, and a drooping portion 313 , a root portion 314 , and an enlarged diameter portion 315 are also provided over the entire circumference in the same manner as the folded portion 312 . The drooping portion 313 in this embodiment extends downward substantially vertically from the lower end of the folded portion 312, the root portion 314 is bent so as to extend substantially horizontally outward from the lower end of the drooping portion 313, and the enlarged diameter portion 315 is Although it extends substantially vertically downward from the outer end of the root portion 314, it is more preferable to form the enlarged diameter portion 315 so as to extend substantially vertically downward with a tendency to open outward. Further, the drooping portion 313 in this embodiment is formed so as to extend downward by bending in a substantially V-shape from the lower end of the inclined portion 3122 of the folded portion 312 .

A first outer container tapered portion 321 whose diameter gradually decreases toward the bottom portion 33 of the outer container 3 is provided at the upper portion of the body portion 32 of the outer container 3 , and the lower portion of the body portion 32 of the outer container 3 , a second outer container tapered portion 322 whose diameter gradually increases toward the bottom portion 33 of the outer container 3 is provided. Reinforcing ribs 331 and 332 are circumferentially provided on the bottom 33 of the outer container 3 so as to protrude inward, and the reinforcing ribs 331 and 332 are concentrically spaced from each other. ing. Furthermore, the bottom portion 33 is provided with a suction hole 333 used when the space between the inner container 2 and the outer container 3 is evacuated by vacuum suction. A getter 334 is provided to absorb gas in the space between the inner container 2 and the outer container 3 after sealing.

The entire outer container 3 is made of a thin material having substantially the same thickness. In the illustrated outer container 3, the cylinders constituting the mouth portion 31 and the body portion 32 are each pressed from a single thin cylinder. The member forming the bottom portion 33 is formed by deforming a single thin plate material by press working or the like. The edge and the upper edge of the body portion 32 are contacted and joined by welding or the like, and the lower edge of the body portion 32 and the upper edge of the substantially dish-shaped bottom portion 33 are butted and joined by welding or the like. The mouth portion 31 and the body portion 32 are formed by deforming a single thin tubular material by press working or the like, and the bottom portion 33 is formed by deforming a single thin plate material by press working or the like. It is also possible to form the outer container 3 by abutting the lower edge of the cylindrical body constituting the trunk portion 32 and the upper edge of the bottom portion 33 and joining them by welding or the like.

The tip end portion 211 of the mouth portion 21 of the inner container 2 is positioned inside the enlarged diameter portion 315 of the outer container 3 so that the tip end edge 2111 of the mouth portion 21 of the inner container 2 is substantially in contact with the base portion 314 of the outer container 3 . is mated to Further, the inner container 2 and the outer container 3 are welded and fixed by the welding portion 5 provided around the tip edge 2111 of the mouth portion 21 of the inner container 2. In the illustrated example, the mouth portion 21 of the inner container 2 is fixed. The leading end edge 2111 is fixed to the base portion 314 of the outer container 3 and its surroundings by the welding portion 5 provided in a circumferential shape.

In the heat insulating double container 1 in which the inner container 2 and the outer container 3 are joined in a predetermined arrangement, the inner container taper portion 221 formed in the body portion 22 of the inner container 2 and the body portion 32 of the outer container 3 are formed. The second outer container tapered portion 322 is spaced apart and provided so as to substantially follow. The heat insulating double container 1 has a first outer container tapered portion 321 whose diameter gradually decreases toward the bottom portion 33 of the outer container 3 and a second outer container tapered portion 321 whose diameter gradually increases toward the bottom portion 33 of the outer container 3. Due to the tapered portion 322, the diameter of the intermediate portion of the body portion 32 is small as a whole, and the diameter gradually increases upward and downward from the intermediate portion of the body portion 32, thereby presenting a substantially drum-shaped outer shape.

When manufacturing the heat insulating double container 1 of the present embodiment, for example, the inner container 2 having a predetermined shape is formed, and the cylindrical body 34m constituting the mouth portion 31 and body portion 32 of the outer container 3 having a predetermined shape is formed. do. A folded portion 312, a drooping portion 313, a base portion 314, and an enlarged diameter portion 315 are provided on the tubular body 34m. Then, the inner container 2 held by the jig 62 is inserted into the cylindrical body 34m held by the jig 61 from the bottom side as indicated by the thick line arrow in FIG. The tip portion 211 of the mouth portion 21 of the inner container 2 is fitted inside the enlarged diameter portion 315 of the cylindrical body 34m so as to substantially abut on the root portion 314 of the body 34m. After that, the inner container 2 and the cylindrical body 34m are welded by laser welding or the like so as to form a circumferential welded portion 5 around the tip edge 2111 of the mouth portion 21 of the inner container 2 (see FIGS. 4 to 6). ).

After that, the upper edge of the bottom portion 33 formed in a predetermined shape and having the getter 334 attached thereto is brought into contact with the lower edge of the cylindrical body 34m and welded by laser welding or the like to obtain the heat insulating double container 1. In addition, if laser welding is used to form the welded portion 5, the outer container 3 can be welded and fixed to the inner container 2 precisely with low distortion. It is good because deformation can be prevented.

In the manufacturing process of the heat insulating double container 1, instead of inserting the inner container 2 from the bottom side of the cylindrical body 34m using the cylindrical body 34m that constitutes the mouth portion 31 and the body portion 32, the folded portion 312 and the hanging portion The inner container 2 is inserted from the bottom side of a cylindrical body that has a portion 313, a root portion 314, and an enlarged diameter portion 315 and constitutes the mouth portion 31, and the mouth portion 21 of the inner container 2 is inserted into the root portion 314 of the cylindrical body. The tip end portion 211 of the mouth portion 21 of the inner container 2 is fitted inside the enlarged diameter portion 315 so that the tip end edge 2111 is substantially abutted, and around the tip end edge 2111 of the mouth portion 21 of the inner container 2, the laser is applied. It is also possible to use a process of forming a welded portion 5 in a circumferential shape by welding or the like and welding the cylinder and the inner container 2 together. In this case, for example, after welding the inner container 2 to the cylinder constituting the mouth portion 31, the cylinder constituting the trunk portion 32 and the member constituting the bottom portion 33 are attached to the cylinder constituting the mouth portion 31. The heat-insulating double container 1 is obtained by sequentially welding or by welding the members constituting the body portion 32 and the bottom portion 33 .

According to this embodiment, by providing the drooping portion 313, the root portion 314, and the enlarged diameter portion 315 on the tip side of the folded portion 312 of the outer container 3, the shape of the tip side of the folded portion 312 is stabilized at a predetermined position, Springback can be prevented. The shape of the distal end side of the folded portion 312 with high stability is such that the distal end edge 2111 of the mouth portion 21 of the inner container 2 can be aligned with the cylindrical body 34m or the like constituting the outer container 3 without a jig for holding this shape. The operation of fitting the tip portion 211 of the mouth portion 21 of the inner container 2 to the inside of the enlarged diameter portion 315 such as the cylindrical body 34m constituting the outer container 3 so as to substantially abut on the root portion 314 of the inner container 2 It is possible to weld the tubular body 34m and the like constituting the inner container 2 and the outer container 3 around the tip end edge 2111 of the mouth portion 21 of the container. That is, even if there is no jig for holding the shape of the tip side of the folded portion 312, the cylindrical body 34m or the like constituting the outer container 3 and the mouth portion 21 of the inner container 2 can be accurately fitted and welded with high accuracy. It can be carried out. Moreover, since it is possible to manufacture without using a jig for holding the shape of the distal end side of the folded portion 312, the manufacturing cost can be reduced.

In addition, by bending from the lower end of the inclined portion 3122 of the folded portion 312 to extend the drooping portion 313 downward, and by providing the root portion 314 and the enlarged diameter portion 315 that are bent from the drooping portion 313, the folded portion 312 can be bent with higher stability. can be stabilized at a predetermined position. Therefore, it is possible to further improve the accuracy of the fitting work and welding work between the cylindrical body 34m and the like constituting the outer container 3 and the mouth portion 21 of the inner container 2 . Further, when the heat insulating double container 1 is used as a container for storing liquid such as a portable thermos flask, the small rounded portion 3121 can improve liquid drainage.

Further, since the tip end edge 2111 of the mouth portion 21 of the inner container 2 can be substantially abutted on the root portion 314 extending substantially horizontally, the positioning of the outer container 3 or the cylindrical body 34m constituting the outer container 3 and the inner container 2 can be made more accurate. It can be done easily and accurately. Further, when the enlarged diameter portion 315 is extended downwardly and substantially vertically with a tendency to open outward, the leading end portion 211 of the mouth portion 21 of the inner container 2 may be attached to the enlarged diameter portion 315 of the cylindrical body 34m constituting the outer container 3 or the like. It is possible to perform the operation of fitting inside the more smoothly.

Further, according to the manufacturing process example for manufacturing the heat-insulated double container 1 of the present embodiment, even without a jig for holding the shape of the distal end side of the folded portion 312, the cylindrical body 34m and the like constituting the outer container 3 The inner container 2 can be easily positioned at an accurate position and welded securely.

[Scope of invention disclosed in this specification]
In addition to the inventions, embodiments, and modifications thereof listed as inventions, the invention disclosed in this specification can be changed to other contents disclosed in this specification to the extent applicable. What is specified, what is specified by adding other content disclosed in this specification to these contents, or these partial contents are deleted to the extent that partial effects can be obtained and general concepts Include what you specify. The invention disclosed in this specification also includes the following modifications and additional content.

For example, the folded portion 312 of the mouth portion 31 of the outer container 3 in the heat insulating double container 1 of the above-described embodiment has a small rounded portion 3121 formed at the tip, and the inner end of the small rounded portion 3121 slopes downward and inward. Although the inclined portion 3122 is formed in the shape, the shape of the folded portion of the opening of the outer container may be other shapes, such as a substantially U-shaped folded portion of the opening of the outer container. include.

For example, the shape and configuration of the heat-insulating double container of the present invention are not limited to the above embodiments, and are appropriate within the scope of the present invention. The tip of the mouth of the inner container is fitted inside the enlarged diameter part so that the tip of the mouth of the container is substantially in contact with the root, and the tip of the mouth of the inner container is fitted around the tip of the mouth of the inner container. Any suitable insulated double container having a welded outer container is encompassed by the present invention. In addition, the present invention can be applied to appropriate heat-insulated double containers such as double-structured portable thermos flasks, desktop thermos flasks, mug cups, soup cups, and lunch jars.

INDUSTRIAL APPLICABILITY The present invention can be used, for example, for heat-insulating double containers such as double-structured portable thermos flasks, desktop thermos flasks, mug cups, soup cups, and lunch jars.

DESCRIPTION OF SYMBOLS 1... Thermal insulation double container 2... Inner container 21... Mouth part 211... Tip part 2111... Tip edge part 22... Body part 221... Inner container taper part 23... Bottom part 3... Outer container 31... Mouth part 311... Tip part 312... Folding Portion 3121 Small rounded portion 3122 Inclined portion 313 Drooping portion 314 Root portion 315 Expanded diameter portion 316 Bottom portion 32 Body portion 321 First outer container taper portion 322 Second outer container taper portion 33 Bottom part 331, 332 Reinforcing rib 333 Suction hole 334 Getter 34 m Cylindrical body 4 Thermal insulation layer 5 Welded part 61, 62 Jig 10 Lid

Claims (4)

A heat insulating layer is provided between a substantially bottomed cylindrical inner container made of metal and a substantially bottomed cylindrical metal outer container,
A folded portion folded inward is formed at the leading end of the mouth portion of the outer container formed by deforming a thin tubular member,
A hanging portion extending downward from the lower end of the folded portion, a root portion bending outward from the lower end of the hanging portion, and an enlarged diameter portion extending downward from the outer end of the root portion are provided,
The folded portion has a shape in which a small rounded portion is formed at the tip, and an inclined portion that slopes downward from the inner end of the small rounded portion is formed. is provided with the hanging portion extending to
The tip end of the mouth of the inner container is fitted inside the enlarged diameter portion such that the tip edge of the mouth of the inner container is substantially in contact with the root,
A heat-insulating double container, wherein the inner container and the outer container are welded together around the leading edge of the mouth of the inner container. A heat insulating layer is provided between a substantially bottomed cylindrical inner container made of metal and a substantially bottomed cylindrical metal outer container,
A substantially U-shaped folded portion folded inward is formed at the leading end of the mouth portion of the outer container formed by deforming a thin cylindrical member,
A hanging portion extending downward from the lower end of the folded portion, a root portion bending outward from the lower end of the hanging portion, and an enlarged diameter portion extending downward from the outer end of the root portion are provided,
The tip end of the mouth of the inner container is fitted inside the enlarged diameter portion such that the tip edge of the mouth of the inner container is substantially in contact with the root,
A heat-insulating double container , wherein the inner container and the outer container are welded together around the leading edge of the mouth of the inner container . The root portion is formed to extend outward substantially horizontally,
3. The insulated double container according to claim 1, wherein said enlarged diameter portion is formed so as to extend substantially vertically downward with a tendency to open outward. A method for manufacturing the insulated double container according to any one of claims 1 to 3,
The inner container is inserted from the bottom side into a cylindrical body that constitutes at least the mouth portion of the outer container and is provided with the folded portion, the hanging portion, the root portion, and the enlarged diameter portion, a first step of fitting the tip portion of the mouth portion of the inner container to the inner side of the enlarged diameter portion such that the tip edge of the mouth portion is substantially in contact with the base portion of the tubular body;
A method for manufacturing an insulated double container, comprising a second step of welding the inner container and the cylindrical body around the leading edge of the mouth portion of the inner container.

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