JP2006204577A - Metallic double container and metallic vacuum double container - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a metallic double container capable of effectively shortening exhaust time without obstructing exhaust by a sealing material while being a simple structure, and a metallic vacuum double container using the same. <P>SOLUTION: In the metallic double container for which an exhaust hole for exhausting the air of a gap part between the outer container and inner container of the metallic double container is formed inside a recessed part on the surface of the outer container or the inner container, the exhaust hole is formed by providing a notch inside the recessed part, raising one side of the notch, and opening the notch part, and the exhaust hole is sealed with the 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 sealed at the mouth 3 to produce a metal double container 4. 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. Further, the inner container 1 or the outer container 2 is provided with an exhaust hole 6 for exhausting air from the gap 5 in the recess.

  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 holes are 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, and if it is made thinner than this, it is not preferable from the viewpoint of strength.

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

  As described above, the exhaust hole covers the exhaust hole when the sealing material is heated and softened and flows, and is cooled and solidified in that state to be sealed. However, if the exhaust hole is made large (diameter 2 mm or more), the softened sealing material may fall out of the exhaust 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.

  Also, depending on the shape of the exhaust hole, when the air is exhausted from the metal double container, the sealing material is disposed in the recess having the exhaust hole, so the sealing material may block the exhaust hole, This contributes to a reduction in exhaust efficiency.

In order to solve such problems, a protrusion or groove is provided around the exhaust hole (see Patent Document 1), or a sealing material is fixed so as not to block the exhaust hole in the vicinity of the exhaust hole. A method of providing pins (see Patent Document 2) has been proposed.
JP 2002-345655 A JP 2000-166777 A

  However, the metal double containers described in Patent Documents 1 and 2 have a problem in that the structure is complicated, and thus production takes time and cost.

  Furthermore, the metal double container described in Patent Document 2 also has a problem that it takes time to arrange the sealing material.

  An object of the present invention is to provide a metal double container and a metal vacuum double container using the same, which have a simple structure but are not hindered by the sealing material and can effectively shorten the exhaust time. That is.

  The present inventor has provided a notch inside the concave portion and raised one side of the notch to form the exhaust hole, so that the exhaust hole is not blocked by the sealing material while being a simple structure. It can be effectively shortened and can be reliably sealed, and is proposed as the present invention.

  That is, the metal double container of the present invention comprises an outer container and an inner container, and has an air gap between the outer container and the inner container, and an exhaust hole for exhausting air in the air gap. Alternatively, in the metal double container formed in the recess on the surface of the inner container, the exhaust hole is formed by providing a notch in the recess and then raising one side of the notch to open the notch. It is characterized by being made.

  The metal vacuum double container of the present invention comprises an outer container and an inner container, and has a gap between the outer container and the inner container, and an exhaust hole for exhausting the air in the gap. In a metal vacuum double container formed in a recess on the surface of a container or an inner container, and the exhaust hole is sealed with a sealing material, the exhaust hole is provided with a cut in the recess, The exhaust hole of the metal double container formed by raising one side of the cut and opening the cut portion is sealed with a sealing material.

  Although the metal double container of the present invention has a simple structure, the exhaust is not hindered by the sealing material, the exhaust time can be effectively shortened, and the exhaust hole can be reliably sealed.

  In the metal double container of the present invention, an exhaust hole is formed at the edge of the notch by raising one side of the notch. Such an exhaust hole is preferable because it can be easily pressed. In particular, the bottom portion of the outer container is preferable because it is easy to mold.

  The notch (opening width of the exhaust hole) is preferably about 2 to 3 mm, and the distance between the raised portion and the bottom of the recess (opening height of the exhaust hole) is preferably about 0.5 to 1.5 mm. If any numerical value is smaller than that value, the exhaust time tends to be difficult to shorten, and if it is larger than the numerical value, there is a possibility that the sealing material cannot be surely sealed. In particular, since the opening height of the exhaust hole can be adjusted by the press load, it can be set to match the exhaust schedule in the exhaust process.

  Since the opening of the exhaust hole is substantially in the shape of a leaf, it is preferable that the exhaust hole is less likely to be blocked by the sealing material and less likely to inhibit exhaust.

  In the metal double container of the present invention, when a plurality of exhaust holes are formed, the total opening area of the exhaust holes becomes large, which is preferable because the exhaust speed can be increased. It is preferable that a plurality of exhaust holes be formed in one recess since the opening area can be increased and sealing can be performed at one time. Further, since the number and positions of the exhaust holes can be arbitrarily set so as to meet the exhaust schedule in the exhaust process, it is possible to efficiently perform vacuum exhaust.

  Further, it is preferable that the exhaust holes are formed at positions apart from each other because the exhaust time can be shortened. In particular, it is preferable that the air gap is formed near the shoulder and the bottom of the side or the bottom of the side where the volume of the gap is large, so that the air can be efficiently exhausted.

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

  2-4 shows embodiment of the metal double container in this invention.

  A metal double container 10 according to the first embodiment is formed by overlapping a metal inner container and an outer container and sealing them at the mouth like the metal double container 4 shown in FIG. Yes.

  As shown in FIG. 2, a recess 13 is formed in the center of the bottom 12 of the outer container 11. A semicircular raised portion 14 is formed in the recessed portion 13, and an exhaust hole 15 surrounded by the edge 13 a of the recessed portion 13 and the edge 14 a of the raised portion 14 is formed.

  Incidentally, the exhaust hole 15 was produced as follows.

  First, the recessed part 13 was formed by pressing a metal plate.

  Next, a 3 mm straight cut was provided at the center of the recess 13.

  Finally, pressing was performed so that one side of the cut (the right side in FIG. 2) was raised to form a leaf-shaped exhaust hole 15 having an opening width of 3 mm and an opening height of 1 mm.

  As a second embodiment, as shown in FIG. 3, the metal double container 20 is formed in the recess 21 so that two semicircular ridges 22, 22 face each other. The two exhaust holes 23, 23 surrounded by the edge 21 a and the edge 22 a of the raised portion 22 are formed. The other portions are formed in the same manner as the metal double container 10.

  As a third embodiment, as shown in FIG. 4, the metal double container 30 has a single band-like ridge 32 formed in the recess 31, and the edges 31 a and 31 a of the recess 31 and the ridge Exhaust holes 33, 33 surrounded by 32 edges 32a, 32a are formed. The other portions are formed in the same manner as the metal double container 10.

It is sectional drawing of a partial fracture | rupture which shows a metal double container. 1st embodiment of a metal double container is shown, (a) is a top view of a bottom face, (b) is sectional drawing of the partially broken line of AA. 2nd embodiment of a metal double container is shown, (a) is a top view of a bottom face, (b) is sectional drawing of the partially broken line of BB. 3rd embodiment of a metal double container is shown, (a) is a top view of a bottom face, (b) is sectional drawing of the partially broken line of CC.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Inner container 2, 11 Outer container 3 Mouth part 4, 10, 20, 30 Metal double container 5 Cavity part 6, 15, 23, 33 Exhaust hole 12 Bottom part 13, 21, 31 Recessed part 13a, 14a, 21a, 22a , 31a, 32a Rim 14, 22, 32 Bump

Claims (3)

  It consists of an outer container and an inner container, and has an air gap between the outer container and the inner container, and an exhaust hole for exhausting air in the air gap is formed in a recess on the surface of the outer container or the inner container. In the metal double container, the exhaust hole is formed by providing a cut in the recess, and then raising one side of the cut to open the cut portion. container.   The metal double container according to claim 1, wherein a plurality of exhaust holes are formed.   An exhaust hole of the metal double container according to claim 1 or 2 is sealed with a sealing material.