JP2017006598A - Double heat insulation container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress heat conduction at a neck part of an inner bottle while avoiding insufficient strength of the neck part of the inner bottle of a double heat insulation container.SOLUTION: The double heat insulation container includes: the bottomed cylindrical inner bottle 3 formed of a metal material; and an outer bottle 4 for storing the inner bottle 3. The inner bottle 3 includes: an upper end part 8 jointed to an inner periphery of the outer bottle 4; a seal part 10 of which diameter is reduced downward from the upper end part 8; and a thin wall part 11 of which thickness is thinner than those of the upper end part 8 and the seal part 10 between the upper end part 8 and the seal part 10.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a double insulated container used for carrying food and drink.

  In general, this type of double insulated container includes an inner bottle and an outer bottle made of a metal material. The inner bottle is a bottomed cylindrical container for storing the contents. The outer bottle is a container that accommodates the inner bottle. In the inner bottle and the outer bottle, the outer peripheral wall of the upper end portion of the inner bottle and the inner peripheral wall of the outer bottle are joined. The space between the inner bottle and the outer bottle is a space that is used as an air accommodating portion, a vacuum portion, or the like, and has a heat insulating effect. The inner bottle has a seal portion whose diameter is reduced below the upper end portion. When the stopper is attached to the double heat insulating container, the packing provided in the stopper is brought into close contact with the seal portion, and the inner bottle is sealed.

  In this type of double insulated container, conventionally, the thickness of the inner bottle is reduced to suppress heat conduction and to improve the heat insulation performance. In particular, the neck portion which is external to the inner space of the inner bottle sealed with the packing is easily in contact with the outside air, and it is preferable to further reduce the heat conduction by reducing the thickness of the inner bottle neck portion (for example, patent Reference 1).

JP 2001-25441 A (particularly paragraphs 0007 and 0032, FIG. 2)

  However, at present, in order to achieve both weight reduction and heat insulation performance of the double insulated container, it is important to reduce the thickness of the metal material used for the inner bottle as much as possible and to reduce the thickness of the entire inner bottle. . In the future, demands for weight reduction and improvement of heat retention performance will not stop, and it may be required to further reduce the thickness of the material. If the neck portion of the inner bottle becomes thinner by further reducing the thickness of the material, there is a concern that the inner bottle may be damaged due to insufficient strength of the neck portion when the double heat insulating container is dropped.

  Therefore, the problem to be solved by the present invention is to suppress heat conduction at the neck of the inner bottle while avoiding insufficient strength of the neck of the inner bottle.

  In order to solve the above-described problems, the present invention includes a bottomed cylindrical inner bottle formed of a metal material and an outer bottle that accommodates the inner bottle, and the inner bottle is an inner bottle of the outer bottle. In a double heat insulating container having an upper end portion joined to the periphery and a seal portion having a diameter reduced downward from the upper end portion, the inner bottle has the upper end portion and the seal portion between the upper end portion and the seal portion. The structure characterized by having a thin part thinner than the seal part is adopted.

  According to the said structure, the neck part which hits the exterior with respect to the internal space sealed by the packing closely_contact | adhered to the seal part exists above the seal part of an inner bottle. That is, since the neck portion has a thin portion between the upper end portion of the inner bottle and the seal portion, heat conduction at the neck portion can be suppressed. Further, since the neck portion has a thin portion only between the upper end portion and the seal portion, the upper end portion and the seal portion can be made relatively thick. Accordingly, the durability against the radial load applied to the inner bottle can be maintained at the upper end portion, and the durability against the vertical load applied to the inner bottle can be maintained at the seal portion.

More specifically, it is preferable that the inner bottle has a throttle portion that is gradually reduced in diameter downward from the upper end portion, and the thickness of the throttle portion is thicker than that of the thin portion.
If it does in this way, the heat insulation part formed between an inner bottle and an outer bottle can be gradually widened from an upper end part by a throttle part, and heat insulation can be improved. In addition, since the inner bottle is reduced in diameter from the upper end portion to the throttle portion, the size of the cross-sectional area of the thin portion between the throttle portion and the seal portion can be suppressed, and heat conduction can be further suppressed. Further, since the throttle portion is also relatively thick, durability against the vertical load applied to the inner bottle can be maintained.

  According to the present invention, since the neck portion has a thin portion between the upper end portion of the inner bottle and the seal portion, the heat conduction at the neck portion can be suppressed. Moreover, since there is a thin portion only between the upper end portion and the seal portion, the upper end portion and the seal portion can be made relatively thick. Accordingly, the durability against the radial load applied to the inner bottle can be maintained at the upper end portion, and the durability against the vertical load applied to the inner bottle can be maintained at the seal portion. Therefore, it is possible to suppress heat conduction at the neck portion of the inner bottle while avoiding insufficient strength of the neck portion of the inner bottle.

The fragmentary longitudinal cross-section which shows the upper end part vicinity of the inner bottle of the double heat insulation container which concerns on embodiment of this invention The longitudinal cross-sectional view which shows the whole structure of the double heat insulation container which concerns on embodiment of this invention

An embodiment as an example of the present invention will be described with reference to the accompanying drawings.
As shown in FIG. 2, the double insulated container of this embodiment includes a bottle 1 and a stopper 2. The bottle 1 is a vacuum double bottle including an inner bottle 3, an outer bottle 4, and a shoulder exterior cover 5.

  The inner bottle 3 is a bottomed cylindrical container made of a metal material. The inner bottle 3 accommodates food and drinks to be carried. The outer bottle 4 is a container formed of a metal material that accommodates the inner bottle 3. Here, the heat insulating portion 6 provided between the inner bottle 3 and the outer bottle 4 is a vacuum sucked space. A getter 7, a reflective foil (not shown), and the like are disposed in the heat insulating portion 6.

  FIG. 1 shows a cross-sectional view in which the inner bottle 3 is cut along a vertical plane and the vicinity of the upper end 8 is enlarged. As shown in the figure, the inner bottle 3 includes an upper end portion 8 joined to the inner periphery of the outer bottle 4, a throttle portion 9 whose diameter is gradually reduced downward from the upper end portion 8, the upper end portion 8 and the throttle portion. A seal portion 10 having a reduced diameter below the portion 9, and a thin portion 11 formed between the seal portion 10 and the throttle portion 9 and having a thickness thinner than that of the upper end portion 8, the throttle portion 9 and the seal portion 10, Have. Here, the wall thickness means a plate thickness in the normal direction to the inner peripheral wall at an arbitrary position of the inner bottle 3.

  The upper end 8 is formed in a cylindrical shape. The upper end 8 has a uniform thickness t1 as a whole.

  The entire narrowed portion 9 has a thickness t2 that is hardly different from the thickness t1.

  The seal part 10 is reduced in diameter from the vicinity below the thin part 11. The seal portion 10 has a wall thickness t3 that is almost the same as the wall thickness t1.

  The thin portion 11 is formed in a cylindrical shape having the same inner diameter as that of the throttle portion 9 and an outer diameter smaller than that of the throttle portion 9 from near the lower portion of the throttle portion 9. The thin portion 11 has a thickness t4 (t1, t2, t3> t4) that is thinner than the thickness t1 of the upper end portion 8, the thickness t2 of the throttle portion 9, and the thickness t3 of the seal portion 10.

  As a material for forming the inner bottle 3, a thin plate of stainless steel is used. The thickness of the material is generally 0.2 mm or less. After the cylindrical body is formed from the material, the upper end portion 8, the drawn portion 9, the seal portion 10, and the thin portion 11 are formed by spinning. The spinning process is a plastic process in which a plate-like or tubular material (blank) is pressed against a rotating mold (mandrel) with a processing roller or spatula. For example, the thin portion 11 is formed by receiving the inner diameter surface with a cylindrical mold and pressing a spatula or the like on the outer diameter surface. Although uneven thickness occurs due to spinning, the thickness t1 of the upper end portion 8, the thickness t2 of the throttle portion 9, and the thickness t3 of the seal portion 10 are each 0.16 to 0.2 mm, and the thickness of the thin portion 11 is set. t4 can be 0.1 mm or less.

  As shown in FIG. 2, the outer bottle 4 has a bottomed cylindrical body by joining the outer periphery of the upper end 8 of the inner bottle 3 to the inner periphery of the upper end of the barrel member, and then joining the bottom member to the lower end of the barrel member. It is said that.

  A shoulder exterior cover 5 is attached to the top of the outer bottle 4.

  The plug 2 is detachably attached to the shoulder exterior cover 5. The stopper 2 includes a packing 12, and the inner bottle 3 is sealed when the packing 12 comes into close contact with the seal portion 10. The neck portion that is the outside of the inner space 13 of the inner bottle 3 sealed with the packing 12 is an inner portion formed by a seal portion 10 (most part), a thin portion 11, a throttle portion 9, and an upper end portion 8 in order from the bottom. It has a peripheral surface and is in contact with the outside air that has entered the gap 14 between the plug 2.

  The double heat insulating container of the embodiment is as described above, and has the thin wall portion 11 between the seal portion 10 of the inner bottle 3 and the upper end portion 8 of the inner bottle, so that the heat conduction at the neck portion is performed. Can be suppressed.

  Moreover, since the double heat insulation container of embodiment has the thin part 11 only between the upper end part 8 and the seal | sticker part 10, the thickness t1 of the upper end part 8 and the thickness t3 of the seal part 10 are made into the thin part 11. It becomes possible to make it relatively thick with respect to the wall thickness t4. As a result, the durability against the radial load applied to the inner bottle 3 can be maintained at the upper end 8, and the durability against the vertical load applied to the inner bottle can be maintained at the seal portion 10. .

  Moreover, the double heat insulation container of embodiment can make the heat insulation part 6 between the outer bottle 4 and the inner bottle 3 gradually wide from the upper end part 8 by the throttle part 9, and can improve heat insulation.

  In the double heat insulating container of the embodiment, the inner bottle 3 is reduced in diameter from the upper end portion 8 to the throttle portion 9, so that the size of the cross-sectional area of the thin portion between the throttle portion 9 and the seal portion 10 is suppressed. Heat conduction can be further suppressed.

  In the double heat insulating container of the embodiment, the wall thickness t2 of the throttle portion 9 is also relatively thick with respect to the wall thickness t4 of the thin portion 11, so that the durability against the vertical load applied to the inner bottle 3 is increased. Can be maintained.

  In addition, when the inner bottle 3 has contents, the lower side of the double insulated container is heavy, and when the double insulated container is accidentally dropped, it often collides with the ground from the lower side, and the collision load in that case is It works mainly in the vertical direction. Since the double insulated container according to the embodiment does not have to reduce the durability in the vertical direction by the seal part 10 or the throttle part 9, even if the inner bottle 3 is made thin, the reduced seal part 10 or It is possible to prevent excessive deformation of the throttle portion 9 and to prevent the inner bottle 3 from being broken.

  In addition, when the inner bottle 3 is empty, the double insulated container may fall sideways and collide with the ground from the upper side. In this case, the collision load is on the upper side of the double insulated container. Acts mainly in the radial direction. Since the double insulated container according to the embodiment can maintain the radial durability of the upper end portion 8, even if the material of the inner bottle 3 is made thinner, the upper end portion 8 of the inner bottle 3 and the outer bottle 4 can be joined. It is possible to prevent excessive radial deformation of the portion and to prevent joint breakage.

  In the present embodiment, the case where the inner bottle 3 is formed from a metal plate has been described. However, the inner bottle 3 may be formed by other processing methods.

  Moreover, in this embodiment, although the case where the double heat insulation container is heat-insulated with a vacuum was demonstrated, the thing by a vacuum or other heat insulation members may be used.

  Further, in the present embodiment, the case has been described in which the aperture portion is continuously disposed from the upper end portion, but the upper end portion and the aperture portion may not be continuously disposed.

  It should be thought that embodiment disclosed this time is an illustration and restrictive at no points. Accordingly, the scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

DESCRIPTION OF SYMBOLS 1 Bottle 2 Plug 3 Inner bottle 4 Outer bottle 6 Heat insulation part 8 Upper end part 9 Restriction part 10 Seal part 11 Thin part 12 Packing 13 Internal space 14 Crevice

Claims (2)

A bottomed cylindrical inner bottle formed of a metal material, and an outer bottle that accommodates the inner bottle, wherein the inner bottle is joined to the inner periphery of the outer bottle, and the upper end part. In a double heat insulating container having a seal portion reduced in diameter from below,
The inner bottle has a thin-walled portion that is thinner than the upper end portion and the seal portion between the upper end portion and the seal portion.   2. The double insulated container according to claim 1, wherein the inner bottle has a throttle portion gradually reduced in diameter downward from the upper end portion, and the thickness of the throttle portion is thicker than that of the thin portion.

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