JP2006204578A - Metallic double container and metallic vacuum double container - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a metallic double container capable of easily sealing an exhaust hole in a simple structure without taking time for exhaust of a gap part, and a metallic vacuum double container using the same. <P>SOLUTION: This metallic double container is characterized in that, in the metallic double container composed of an outer container and an inner container and provided with a gap between the outer container and the inner container, the outer container or the inner container is provided with the plurality of exhaust holes for vacuuming the gap part. The metallic vacuum double container of this invention is characterized in that the exhaust holes of the metallic double container, which is composed of the outer container and the inner container, provided with the gap between the outer container and the inner container, and provided with the plurality of exhaust holes for vacuuming the gap part on the outer container or the inner container, are sealed with a sealing material. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a metal double container and a metal vacuum double container using the same.

  A vacuum double container is used as, for example, a thermos, a lunch jar, or an electric pot because of its excellent heat retention. In the past, it was mainly made of glass, but since it is hard to break and can be made lightweight, vacuum double containers made of metal (stainless steel, etc.) are now widely used.

  A metal vacuum double container is generally produced as follows.

  First, as shown in FIG. 1, the metal inner container 1 and the outer container 2 are overlapped, and the metal double container 4 sealed at the mouth 3 is produced. Note that the inner container 1 and the outer container 2 are not in contact with each other except the mouth part 3, and a gap part 5 exists between the inner container 1 and the outer container 2. The inner container 1 or the outer container 2 is provided with an exhaust hole 6 for exhausting air from the gap 5.

  Next, a sealing material made of glass or metal having a low melting point is placed near the exhaust hole provided in the recess, and the metal double container is put into a vacuum atmosphere to exhaust the air in the gap.

  Subsequently, the temperature of the metal double container is raised to a temperature at which the sealing material softens and flows in a vacuum atmosphere, and the exhaust holes are covered with the softened and fluidized sealing material.

  Finally, by cooling the metal double container in a vacuum atmosphere, the sealing material is solidified and the exhaust hole is sealed, so that a metal vacuum double container in which the gap is kept in vacuum is produced.

  In recent years, the capacity of vacuum double containers has been increased, and along with this, the time required for evacuating the gap between the inner container and the outer container has become longer. On the other hand, in order to improve productivity, it is required to shorten the exhaust time.

  Furthermore, metal vacuum double containers are increasingly used for portable purposes because they are not easily damaged, and are required to be compact while having a large capacity. That is, since the gap is narrowed, the air resistance tends to increase and the exhaust time tends to be longer.

  In order to shorten the exhaust time, a method for increasing the capacity of the exhaust pump and a method for reducing the exhaust resistance at the opening of the exhaust hole have been studied.

  The former can surely shorten the exhaust time, but is not preferable from the economical aspect such as equipment cost and operation cost. In addition, if exhaust is performed in a short time, the wind pressure of the air passing through the exhaust hole increases, and the sealing material placed near the exhaust hole is likely to be blown away by the wind pressure.

  The latter includes a method of reducing the thickness of the exhaust hole and a method of increasing the opening area of the exhaust hole. However, in the metal double container, the thickness of the exhaust hole is 0.4 to 0.5 mm.

  Under these circumstances, methods for increasing the opening area of the exhaust holes have been studied.

  As described above, the exhaust hole is sealed by heating the sealing material to soften and flow and solidifying it in a state of covering the exhaust hole. However, if the exhaust hole is made large (diameter 2 mm or more), the softened sealing material may fall out of the hole or the sealing may be insufficient. Moreover, even if it can be sealed, there is a tendency that it is difficult to obtain a predetermined strength, and there is a possibility that the sealing portion may be damaged when used for a long period of time.

Therefore, a metal double container having a metal mesh-like exhaust hole is proposed so that the exhaust hole is enlarged and the sealing material does not fall out of the hole (see, for example, Patent Document 1). ).
Japanese Patent Laid-Open No. 6-261834

  However, the metal double container described in Patent Document 1 has complicated processing of the mesh-shaped exhaust holes, and when the external force is applied due to the weakness of the mesh portion, the external force is directly applied to the sealing material. There is a problem that the sealing strength is low as compared with the case where the exhaust hole is sealed.

  An object of the present invention is to provide a metal double container capable of easily sealing an exhaust hole having a simple structure, and a metal vacuum double container using the same, which does not take time to exhaust the gap. .

  The present inventor can shorten the exhaust time by providing a plurality of exhaust holes, and reliably and firmly seal the exhaust holes by making the size of the exhaust holes approximately the same diameter of 1 to 1.8 mm. It is found that it can be stopped and is proposed as the present invention.

  That is, the metal double container of the present invention is composed of an outer container and an inner container, and in the metal double container having a gap between the outer container and the inner container, the void portion is vacuumed in the outer container or the inner container. It is characterized in that a plurality of exhaust holes are provided.

  Further, the metal vacuum double container of the present invention comprises an outer container and an inner container, and a space is formed between the outer container and the inner container, and the exhaust for evacuating the space in the outer container or the inner container. The exhaust hole of the metal double container provided with a plurality of holes is sealed with a sealing material.

  The metal double container of the present invention can be reliably sealed because the opening area of each exhaust hole is not large. Further, since a plurality of exhaust holes are provided, the total opening area of the exhaust holes is widened, and the exhaust time can be shortened. Therefore, it is not necessary to process the exhaust hole into a complicated shape.

  Further, by arbitrarily setting the number and positions of the exhaust holes, it is possible to set a load that matches the exhaust schedule in the exhaust process, and therefore it is possible to efficiently perform vacuum exhaust.

  The metal double container of the present invention is provided with an exhaust hole at the shoulder or bottom where the volume of the gap formed between the outer container and the inner container is large (the distance between the outer container and the inner container is wide). It is preferable because air in the gap can be efficiently exhausted.

  The shoulder portion refers to a portion between the mouth portion and the trunk portion (near the center of the side surface) where the outer container and the inner container are sealed.

  The exhaust hole may be formed in the outer container or the inner container.

  The metal double container of the present invention is preferably provided with an exhaust hole in a recess formed in the outer container or the inner container because the sealing material can be easily placed.

  Even if a plurality of exhaust holes are provided in one recess, one exhaust hole may be provided in the recess, and the recess may be formed in a plurality of locations.

  Further, when exhaust holes are provided in the same recess, if the distance between the centers of the exhaust holes is within 10 mm, a plurality of exhaust holes can be sealed simultaneously with one sealing material. preferable. Preferably, it is within 5 mm.

In the metal double container of the present invention, the total area of the openings of the exhaust holes is preferably 3 to 10 mm ² .

If the total area of the openings of the exhaust holes is smaller than 3 mm ^2, less the effect of shortening the evacuation time, if greater than 10 mm ^2, preferably in terms of workability because the number of exhaust holes to be sealed is increased Absent.

  The number of exhaust holes is preferably 5 or less in consideration of workability for sealing.

The size of each exhaust hole is preferably 0.75 to 2.6 mm ² .

When it is larger than 0.75 mm ^2, it is preferable because the exhaust speed is easily increased. When it is smaller than 2.6 mm ^2, it is preferable because it is easily sealed with a sealing material. A preferable size of the exhaust hole is 1.0 to 2.0 mm ² .

  The shape of the exhaust hole may be any shape such as a circle, an ellipse, a spindle, or an egg.

  Glass or an alloy can be used as the sealing material for sealing the exhaust hole.

As the glass, PbO—B ₂ O ₃ glass, Bi ₂ O ₃ —B ₂ O ₃ glass, SnO—P ₂ O ₅ glass, etc. can be used, and if necessary, alumina, cordierite In addition, filler powder such as willemite may be added.

  As the alloy, Sn—Pb solder, Sn—Ag—Cu solder, Ni—Pd—Au solder or the like can be used.

  The sealing material preferably contains substantially no lead from the viewpoint of recent environmental problems.

  The shape of the sealing material may be a spherical shape, a cylindrical shape, a conical shape, a prismatic shape, an oval shape, a lens shape, or a flat shape such as a speculum.

  Hereinafter, it demonstrates in detail using the Example of this invention.

  2-5 shows embodiment of the metal double container in this invention.

  In the metal double container 10 of FIG. 2, an inner container 11 and an outer container 12 are welded at a mouth portion 10a. A gap 13 is provided between the inner container 11 and the outer container 12.

  The outer container 12 is provided with concave portions 14 and 15 having a diameter of 10 mm at two locations on the side surface portion, and exhaust holes 14a and 15a having a diameter of 1.5 mm are provided at the centers of the concave portions 14 and 15, respectively. .

  Since the metal double container 10 is provided at the position where the exhaust holes 14a and 15a are separated from each other, and at the shoulder and bottom where the volume of the gap 13 is large, the exhaust time is the same as the case where there is one exhaust hole. It becomes shorter compared.

  The metal double container 20 of FIG. 3 is provided with recesses 22 and 23 having a diameter of 10 mm at the bottom 21a of the outer container 21, and exhaust holes 22a having a diameter of 1.5 mm at the centers of the recesses 22 and 23, respectively. The structure is the same as that of the metal double container 20 except that 23a is provided.

  Since the metal double container 20 is provided at a position where the exhaust holes 22a and 23a are separated from each other, and both are provided at the bottom where the volume of the gap portion is large, the exhaust time is compared with the case where there is only one exhaust hole. Shorter.

  The metal double container 30 of FIG. 4 is provided with a recess 32 having a diameter of 20 mm in the center of the bottom 31a of the outer container 31, and the recess 32 has three exhaust holes 32a, 32a, 32a having a diameter of 1.5 mm. The structure is the same as that of the metal double container 20 except that one is provided.

  Since the metal double container 30 has three exhaust holes 32a, 32a and 32a concentrated, the metal double container 30 operates in the same manner as when the exhaust holes are greatly opened at one place, and the exhaust resistance is small and the exhaust time can be shortened. The sealing material was not blown off during exhaust.

  In addition, since three exhaust holes 32a, 32a, 32a are provided inside one recess 32, all the exhaust holes can be sealed using one sealing material in one sealing process. Excellent workability.

  The metal double container 40 of FIG. 5 is provided with a recess 42 having a diameter of 20 mm in the center of the bottom 41a of the outer container 41. The recess 42 is provided with a concentric annular groove 42a. The groove 42a has the same configuration as that of the metal double container 20 except that three exhaust holes 42aa, 42aa, 42aa having a diameter of 1.5 mm are provided.

  The metal double container 40 is provided with three exhaust holes 42aa, 42aa, 42aa in the annular groove 42a, and the softened sealing material flows along the annular groove 42a. Can be surely sealed.

It is sectional drawing of a partially broken metal double container. 1st embodiment of the metal double container in this invention is shown, (a) is a top view of a side surface, (b) is sectional drawing in an AA line. 2nd embodiment of the metal double container in this invention is shown, (a) is a top view of a side surface, (b) is sectional drawing in a BB line. 3rd embodiment of the metal double container in this invention is shown, (a) is a top view of a bottom face, (b) is sectional drawing of the partial fracture | rupture in CC line. 4th Embodiment of the metal double container in this invention is shown, (a) is a top view of a bottom face, (b) is sectional drawing of the partial fracture | rupture in a DD line.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,11 Inner container 2, 12, 21, 31, 41 Outer container 3, 10a Mouth part 4, 10, 20, 30, 40 Metal double container 5, 13 Cavity part 6, 14a, 15a, 22a, 23a, 32a, 42aa Exhaust hole 14, 15, 22, 23, 32, 42 Recessed part 21a, 31a, 41a Bottom annular groove 42a

Claims (6)

  In a metal double container comprising an outer container and an inner container and having a gap between the outer container and the inner container, the outer container or the inner container is provided with a plurality of exhaust holes for evacuating the gap. A double container made of metal. ^2. The metal double container according to claim 1, wherein a total opening area of the exhaust holes is 3 to 10 mm ² .   The metal double container according to claim 1 or 2, wherein the exhaust hole is provided in a recess formed in the outer container or the inner container.   The metal double container according to claim 1 or 2, wherein a plurality of exhaust holes are provided in the recess.   The metal double container according to claim 1 or 2, wherein one recess is provided in the recess, and the recess is formed at a plurality of locations.   An exhaust hole of the metal double container according to claim 1 is sealed with a sealing material.