JP2020065675A - Heat insulation double container and production method thereof - Google Patents

Abstract

To achieve a correct fitting work between a cylindrical body forming an outer container and a mouth part of an inner container and a weld work with high accuracy without a jig for holding a shape of a tip end side of a folded part, and reduce production cost.SOLUTION: There is provided a heat insulation double container 1 which is configured so that: a heat insulation layer 4 is formed between a metallic inner container 2 with a metal substantially bottomed cylindrical shape and a metallic outer container 3 with a substantially bottomed cylindrical shape; a folded part 312 folded inward is formed on a tip end part 311 of a mouth part 31 of the outer container 3; a suspension part 313 extends downward from a lower end of the folded part 312; a root part 314 is bent outward from the lower end of the suspension part 313; a diameter expansion part 315 extends downward from an outer end of the root part 314; a tip end part 211 of a mouth part 21 of the inner container 2 is fitted to inside of the diameter expansion part 315 so that a tip end edge 2111 of the mouth part 21 of the inner container 2 substantially contacts the root part 314; and the inner container 2 and the outer container 3 are welded at a periphery of the tip end edge 211 of the mouth part 21 of the inner container 2.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a heat-insulating double container such as a portable thermos having a double structure, a tabletop thermos, a mug, a soup cup, and a lunch jar, and a method for manufacturing the same.

  Conventionally, the structure of the vacuum double container of Patent Document 1 is known as the structure of the heat insulating double container. In this vacuum double container, a folded portion bent inward in a U-shaped cross-section is formed at the tip of the mouth portion of the outer container, and a diameter expansion portion is formed at the mouth portion of the inner container, so that the outer container is folded. The tip of the folded portion of the outer container is fitted to the tip of the folded portion of the outer container until the tip edge of the tip of the inner portion comes into contact with the base of the enlarged portion of the inner container. The periphery of the portion where the tip edge and the root of the expanded diameter portion of the inner container contact each other is fixed by laser welding.

JP-A-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 tip of the folded portion having a U-shaped cross section of the outer container. Since the tip of the overlapping folded part tends to spring back inward, in order to manufacture stably, the tip of the folded part should be pushed outward while pressing it with a jig. It is necessary to fit the expanded diameter portion of the inner container to the outside of the above, and laser-weld the periphery of the portion where the tip edge of the folded portion of the outer container and the root of the expanded diameter portion of the inner container contact. That is, in order to maintain the shape of the tip portion of the folded portion in the manufacturing process and perform accurate fitting work and highly accurate welding work, a jig that holds the tip portion of the folded portion is essential. Further, the use of such a jig is a factor that increases the cost of the manufacturing apparatus.

  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 of the outer container, a jig that holds the shape of the tip of the folded portion is provided. Even without, it is possible to perform accurate fitting work of the cylinder of the outer container and the mouth portion of the inner container, high-precision welding work, and to reduce the manufacturing cost, and a heat-insulating double container and its manufacture. The purpose is to provide a method.

The heat-insulating double container of the present invention is provided with a heat-insulating layer between a substantially bottomed cylindrical metal inner container and a substantially bottomed cylindrical metal outer container, and the tip of the mouth of the outer container. A folded portion that is folded back inward is formed in the portion, a hanging portion that extends downward from the lower end of the folded portion, a root portion that bends outward from the lower end of the hanging portion, and a downward portion from the outer end of the root portion. An extended diameter portion that extends is provided, and the tip portion of the mouth portion of the inner container is fitted inside the diameter enlarged portion so that the tip edge of the mouth portion of the inner container substantially abuts on the root portion. It is characterized in that the inner container and the outer container are welded around the tip edge of the mouth of the inner container.
According to this, by providing the hanging portion, the root portion, and the enlarged diameter portion on the tip end side of the folded portion, the shape of the tip end side of the folded portion can be stabilized at a predetermined position, and spring back can be prevented. The shape of the highly stable folded portion on the tip side is such that the tip edge of the mouth portion of the inner container substantially abuts on the base portion of the cylindrical body forming the outer container, even without a jig for holding the shape. Then, the operation of fitting the tip of the mouth of the inner container to the inside of the expanded portion of the cylindrical body forming the outer container, and configuring the inner container and the outer container 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 that holds the shape of the tip end side of the folded portion, it is possible to perform accurate fitting work between the tubular body forming the outer container and the mouth part of the inner container, and highly accurate welding work. In addition, since it is possible to manufacture without using a jig that holds the shape of the tip end side of the folded portion, it is possible to reduce the manufacturing cost.

In the heat-insulating double container of the present invention, the folded portion has a shape in which a small rounded portion is formed at the tip, and an inclined portion that is inclined inward from the inner end of the small rounded portion is formed downward, It is characterized in that the hanging part is provided which is bent from the lower end of the inclined part and extends downward.
According to this, by bending from the lower end of the inclined portion of the folded portion to extend the hanging portion downward, and by providing the root portion and the expanded diameter portion that bend from this hanging portion, the tip side of the folded portion can be made more stable. The shape of can be stabilized at a predetermined position. Therefore, it is possible to further improve the accuracy of the fitting work between the tubular body forming the outer container and the mouth of the inner container and the accuracy of the welding work. In addition, when the heat insulating double container is a container for storing a liquid such as a portable thermos bottle, the small rounded portion can improve the drainage.

In the heat-insulating double container of the present invention, the root portion is formed to extend outward substantially horizontally, and the diameter-enlarged portion is formed to extend substantially vertically 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 brought into contact with the substantially horizontally extending base portion, the outer container or the cylinder forming the outer container and the inner container can be positioned more easily and accurately. You can In addition, by extending the expanded diameter portion downwardly and substantially vertically with an outward opening tendency, the operation of fitting the tip of the mouth portion of the inner container to the inside of the expanded diameter portion of the tubular body forming the outer container is further improved. It can be done smoothly.

The manufacturing method of the heat insulating double container of the present invention is a method of manufacturing the heat insulating double container of the present invention, comprising at least the mouth portion of the outer container, and the folded portion, the hanging portion, and the root portion. , The inner container is inserted from the bottom side into a cylindrical body provided with the expanded diameter portion, and the tip edge of the mouth portion of the inner container is made to substantially abut the root portion of the cylindrical body. A first step of fitting the tip of the mouth portion of the container inside the expanded diameter portion; and a second step of welding the inner container and the tubular 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 end side of the folded-back portion, the cylindrical body forming the outer container and the inner container can be easily positioned at accurate positions and reliably welded.

  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 of the outer container, the outer container is configured without a jig for holding the shape of the tip of the folded portion. It is possible to perform accurate fitting work between the cylindrical body and the mouth portion of the inner container and high-precision welding work, and to reduce the manufacturing cost of the heat insulating double container.

The front view which shows the heat insulation double container of embodiment by this invention. The longitudinal cross-sectional view which shows the heat insulation double container of embodiment. The partially expanded view which shows the circumference | surroundings of the folding | returning part in the heat insulation double container of embodiment. Explanatory drawing explaining the process of inserting an inner container in the cylinder 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.

[Adiabatic Double Container of Embodiment and Manufacturing Method Thereof]
The heat-insulating double container 1 of the embodiment according to the present invention is used as a portable thermos bottle or the like, and as shown in FIGS. 1 to 3, is a substantially bottomed tubular metal inner container 2 and a substantially bottomed container. It has a cylindrical metal outer container 3, and a space is provided between the inner container 2 and the outer container 3, and this space serves as a heat insulating layer 4. Although 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, the space between the inner container 2 and the outer container 3 is A vacuum heat insulating layer provided with a heat insulating material is provided by applying a metal foil such as copper or aluminum to the heat insulating layer of the air layer under atmospheric pressure, or the outer surface of the inner container 2 or the inner surface of the outer container 3. It is also possible. Incidentally, 10 is a lid for closing the mouth of the heat insulating double container 1.

  The inner container 2 includes an opening-side mouth portion 21, a tubular body portion 22, and a bottom portion 23. The tip portion 211 of the mouth portion 21 of the inner container 2 is formed so as to extend substantially vertically upward, and is provided so as to reach the circumferential tip edge 2111. An inner container taper portion 221 having a diameter gradually increasing toward the bottom portion 23 of the inner container 2 is provided below the body portion 22 of the inner container 2.

  The entire inner container 2 is formed of a thin wall material having substantially the same thickness. The inner container 2 of the illustrated example is formed by deforming a thin wall tubular material having a single mouth portion 21 and body portion 22 by pressing or the like. In addition to being formed, the bottom portion 23 is formed by deforming a single thin plate material by pressing or the like, and the lower end edge of the tubular body forming the mouth portion 21 and the body portion 22 has a substantially dish-shaped bottom portion 23. It is formed by being abutted against the upper edge and joined by welding or the like. In addition, the inner container 2 is formed by forming members that respectively constitute the mouth portion 21, the body portion 22, the bottom portion 23 of the inner container 2, or the subdivided portions of these predetermined portions, and joining these by welding or the like. Alternatively, from the viewpoint of reducing the manufacturing cost and improving the manufacturing efficiency, the entire 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 pressing or the like. May be.

  The outer container 3 includes an opening-side mouth portion 31, a tubular body portion 32, and a bottom portion 33. The 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, and the folded portion 312 is provided along the entire circumference along the opening edge of the outer container 3. There is. The folded portion 312 of the present embodiment has a shape in which a small rounded portion 3121 is formed at the tip and an inclined portion 3122 that is inclined inward from the inner end of the small rounded portion 3121 toward the lower side is formed. The outer diameter of the small rounded portion 3121 is preferably set to 0.9 mm to 1.2 mm from the viewpoint of improving liquid drainage when the liquid is stored in the heat insulating double container 1.

  In the mouth portion 31 of the outer container 3, a hanging portion 313 that extends downward from the lower end of the folded portion 312, a root portion 314 that bends outward from the lower end of the hanging portion 313, and extends downward from the outer end of the root portion 314. The enlarged diameter portion 315 is provided, and the hanging portion 313, the root portion 314, and the enlarged diameter portion 315 are also provided over the entire circumference similarly to the folded portion 312. The hanging portion 313 in the present embodiment extends downward from the lower end of the folded portion 312 in a substantially vertical direction, the root portion 314 is bent so as to extend outward substantially horizontally from the lower end of the hanging portion 313, and the expanded diameter portion 315 is Although it extends substantially vertically downward from the outer end of the root portion 314, it is more preferable that the expanded diameter portion 315 is formed so as to extend downward and extend substantially vertically with an outward opening tendency. Further, the hanging portion 313 in the present embodiment is formed so as to be bent in a substantially V shape from the lower end of the inclined portion 3122 of the folded portion 312 and extend downward.

  A first outer container taper portion 321 having a diameter gradually decreasing toward the bottom portion 33 of the outer container 3 is provided on the upper part of the body part 32 of the outer container 3, and a lower part of the body part 32 of the outer container 3 is provided on the lower part. A second outer container taper portion 322 having a diameter gradually increasing toward the bottom portion 33 of the outer container 3 is provided. Reinforcing ribs 331 and 332 are provided on the bottom portion 33 of the outer container 3 so as to protrude inward, and the reinforcing ribs 331 and 332 are concentrically spaced apart from each other. ing. Further, the bottom portion 33 is provided with a suction hole 333 used when exhausting from the space between the inner container 2 and the outer container 3 by vacuum suction, and the suction hole 333 of the suction hole 333 is provided on the inner surface side of the bottom portion 33. A getter 334 that absorbs gas in the space between the inner container 2 and the outer container 3 after the sealing is installed.

  The outer container 3 is entirely formed of a thin material having substantially the same thickness. In the illustrated outer container 3, the tubular body forming the mouth portion 31 and the body portion 32 is made of a single thin tubular material. An outer end of a hem portion 316 extending outward from the lower end of the mouth portion 31 is formed by being deformed by processing or the like, and a member forming the bottom portion 33 is formed by deforming a single thin plate material by pressing or the like. The edge and the upper edge of the body 32 are abutted and joined by welding or the like, and the lower edge of the body 32 and the upper edge of the substantially plate-shaped bottom 33 are abutted and joined by welding or the like. The mouth portion 31 and the body portion 32 are formed by deforming a single thin-walled tubular material by pressing or the like, and the bottom portion 33 is formed by deforming a single thin-walled plate material by pressing or the like. It is also possible to form the outer container 3 by abutting the lower end edge of the cylinder forming the body 32 and the upper edge of the bottom 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 disposed inside the expanded diameter portion 315 of the outer container 3 such that the tip end edge 2111 of the mouth portion 21 of the inner container 2 substantially abuts on the root portion 314 of the outer container 3. Is fitted to. Further, the inner container 2 and the outer container 3 are welded and fixed to each other by the welded portion 5 provided around the tip edge 2111 of the mouth 21 of the inner container 2, and in the illustrated example, the mouth 21 of the inner container 2 is fixed. The front edge 2111 is fixed to the root portion 314 of the outer container 3 and the periphery thereof by the welded portion 5 provided circumferentially.

  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 on 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 taper portion 322 is provided so as to be spaced apart from and substantially follow. The heat insulating double container 1 includes a first outer container taper portion 321 having a diameter gradually decreasing toward the bottom portion 33 of the outer container 3 and a second outer container having a diameter gradually increasing toward the bottom portion 33 of the outer container 3. Due to the tapered portion 322, the diameter of the middle portion of the body portion 32 is small as a whole, and the body portion 32 has a substantially drum-shaped outer shape in which the diameter gradually increases from the middle portion of the body portion 32 to the upper and lower sides.

  When the heat insulating double container 1 of the present embodiment is manufactured, for example, the inner container 2 having a predetermined shape is formed, and at the same time, the mouth portion 31 and the barrel body 34m of the outer container 3 having the predetermined shape are formed. To do. The cylindrical body 34m is provided with a folded portion 312, a hanging portion 313, a root portion 314, and an enlarged diameter portion 315. 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 shown by the thick arrow in FIG. 3, and the tip edge 2111 of the mouth 21 of the inner container 2 is inserted into the cylinder. The tip portion 211 of the mouth portion 21 of the inner container 2 is fitted inside the expanded diameter portion 315 of the cylindrical body 34m so as to be substantially in contact with the base portion 314 of the body 34m. After that, the inner container 2 and the cylindrical body 34m are welded around the tip edge 2111 of the mouth portion 21 of the inner container 2 by forming a welded portion 5 in a circumferential shape by laser welding or the like (see FIGS. 4 to 6). ).

  After that, the upper end edge of the bottom portion 33 formed in a predetermined shape and having the getter 334 attached thereto is butted to the lower end edge of the cylindrical body 34m, and welded by laser welding or the like to obtain the heat insulating double container 1. If laser welding is used to form the welded portion 5, the outer container 3 can be precisely welded and fixed to the inner container 2 with a low distortion, the residual stress of the heat insulating double container 1 can be reduced, and the It is good because it can prevent deformation.

  In the manufacturing process of the heat insulating double container 1, instead of the structure in which the inner container 2 is inserted from the bottom side of the cylindrical body 34m by using the cylindrical body 34m that forms the mouth portion 31 and the body portion 32, the folding portion 312, the hanging portion 312, The inner container 2 is inserted from the bottom side of the tubular body having the portion 313, the root portion 314, and the expanded diameter portion 315 and forming the mouth portion 31, and the mouth portion 21 of the inner container 2 is inserted into the root portion 314 of the tubular body. The tip portion 211 of the mouth portion 21 of the inner container 2 is fitted inside the enlarged diameter portion 315 so that the tip edge 2111 substantially abuts, and a laser beam is generated around the tip edge 2111 of the mouth portion 21 of the inner container 2. It is also possible to use a step of welding the tubular body and the inner container 2 by forming the welded portion 5 in a circumferential shape by welding or the like. In this case, for example, after the inner container 2 is welded to the tubular body constituting the mouth portion 31, the tubular body constituting the mouth portion 31 is provided with the tubular body constituting the body portion 32 and the member constituting the bottom portion 33. The heat-insulating double container 1 is obtained by sequentially welding or by welding the members forming the body 32 and the bottom 33.

  According to the present embodiment, by providing the hanging portion 313, the root portion 314, and the expanded diameter portion 315 on the tip side of the folded portion 312 of the outer container 3, the shape of the folded portion 312 on the tip side is stabilized at a predetermined position, Springback can be prevented. The shape of the highly stable folded portion 312 on the tip side is such that the tip edge 2111 of the mouth portion 21 of the inner container 2 is the cylindrical body 34m constituting the outer container 3 and the like even without a jig for holding this shape. The inner end of the inner container 2 such that the tip portion 211 of the mouth portion 21 of the inner container 2 is fitted substantially inside the expanded portion 315 of the cylindrical body 34m or the like of the outer container 3 or the inner container 2 This enables the operation of welding the cylindrical body 34m and the like forming the inner container 2 and the outer container 3 around the tip edge 2111 of the mouth portion 21. That is, even if there is no jig for holding the shape of the tip end side of the folded portion 312, accurate fitting work of the cylindrical body 34m and the like forming the outer container 3 and the mouth portion 21 of the inner container 2 and highly accurate welding work can be performed. It can be carried out. In addition, since it is possible to manufacture without using a jig that holds the shape of the folded portion 312 on the tip side, it is possible to reduce the manufacturing cost.

  Further, by bending the lower end of the inclined portion 3122 of the folded-back portion 312 to extend the hanging portion 313 downward, and providing the root portion 314 and the expanded diameter portion 315 that bend from the hanging portion 313, the folded-back portion 312 can be more highly stable. The shape of the tip side of the can be stabilized at a predetermined position. Therefore, it is possible to further improve the accuracy of the fitting work between the cylindrical body 34m and the like that form the outer container 3 and the mouth portion 21 of the inner container 2, and the accuracy of the welding work. Further, when the heat insulating double container 1 is a container such as a portable thermos for storing a liquid, the small rounded portion 3121 can make the liquid run out well.

  Further, since the tip edge 2111 of the mouth portion 21 of the inner container 2 can be substantially brought into contact with the base portion 314 extending substantially horizontally, the outer container 3 or the cylindrical body 34m or the like forming the outer container 3 and the inner container 2 can be positioned more easily. It can be done easily and accurately. Further, when the expanded diameter portion 315 is extended downward and substantially vertically with a tendency to open outward, the distal end portion 211 of the mouth portion 21 of the inner container 2 is expanded to the expanded diameter portion 315 of the cylindrical body 34 m or the like forming the outer container 3. It is possible to smoothly perform the operation of fitting the inside of the.

  Further, according to the above-described manufacturing process example for manufacturing the heat-insulating double container 1 of the present embodiment, even if there is no jig for holding the shape of the tip end side of the folded portion 312, the outer container 3 and the cylindrical body 34m are configured. The inner container 2 can be easily positioned at an accurate position and can be reliably welded.

[Inclusive Scope of Invention Disclosed in the Present Specification]
The invention disclosed in this specification includes, in addition to the inventions, embodiments, and modifications thereof listed as inventions, the partial contents thereof are changed to other contents disclosed in this specification within an applicable range. What is specified, or what is specified by adding other contents of the present disclosure to these contents, or these partial contents are deleted as a superordinate concept by deleting partial effects. Includes those specified. The invention disclosed in the present specification includes the following modifications and added contents.

  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 inclines inward downward from the inner end of the small rounded portion 3121. Although the inclined portion 3122 is formed in the shape, the shape of the folded portion of the mouth portion of the outer container is substantially U-shaped, and the shape of the folded portion of the mouth portion of the outer container is other shape. include.

  For example, the shape and configuration of the heat-insulating double container of the present invention is not limited to the above-described embodiment, is appropriate within the scope of the present invention, and has a folded portion, a hanging portion, a root portion, and a diameter-enlarged portion. The tip of the mouth of the inner container is fitted inside the expanded portion so that the tip of the mouth of the container almost abuts the root, and the inner container is connected to the inner container around the tip of the mouth of the inner container. Any suitable insulated double container in which the outer container is welded is included in the present invention. Further, the present invention can be applied to an appropriate heat insulating double container such as a portable thermos having a double structure, a tabletop thermos, a mug, a soup cup, and a lunch jar.

  INDUSTRIAL APPLICABILITY The present invention can be applied to, for example, a heat-insulating double container such as a portable thermos having a double structure, a tabletop thermos, a mug, a soup cup, and a lunch jar.

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

Claims (4)

A heat insulating layer is provided between a metal container having a substantially bottomed tubular shape and a metal outer container having a substantially bottomed tubular shape,
A folded-back portion that is folded back inward is formed at the tip of the mouth portion of the outer container,
A hanging portion that extends downward from the lower end of the folded portion, a root portion that bends outward from the lower end of the hanging portion, and an enlarged diameter portion that extends downward from the outer end of the root portion are provided.
The tip portion of the mouth portion of the inner container is fitted to the inside of the expanded diameter portion so that the tip edge of the mouth portion of the inner container substantially abuts the root portion,
A heat-insulating double container, wherein the inner container and the outer container are welded around the leading edge of the mouth of the inner container. The folded-back portion has a shape in which a small rounded portion is formed at the tip, and an inclined portion that is inclined inward from the inner end of the small rounded portion is formed,
The heat insulating double container according to claim 1, wherein the hanging portion is provided which is bent from a lower end of the inclined portion and extends downward. The root portion is formed to extend outward substantially horizontally,
The heat-insulating double container according to claim 1 or 2, wherein the expanded diameter portion is formed so as to extend downward and extend substantially vertically with an outward opening tendency. A method for producing the heat insulating double container according to any one of claims 1 to 3,
The inner container is inserted from the bottom side into a tubular 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 expanded diameter portion, A first step of fitting the tip of the mouth of the inner container to the inside of the expanded diameter portion so that the tip edge of the mouth substantially contacts the root of the tubular body;
The manufacturing method of the heat insulation double container characterized by including the 2nd process of welding the said inner container and the said cylinder in the periphery of the front-end | tip edge of the said inner container.

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