JP2010222048A - Vacuum heat insulation container - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vacuum heat insulation container capable of preventing its shape from being deformed into an indefinite shape even if the container is exposed under a high temperature for a predetermined period of time, wherein its size is compact and a heat insulation performance can remarkably be improved. <P>SOLUTION: There are provided an inner container 11 having a first opening 15 opened at one end, an outer container 12 arranged by a predetermined space from the inner container 11 to enclose it and having a second opening 21 opened at one end and fixed to the outer surface of the first opening 15, a heat-proof core material 37 arranged at either the outer surface of the inner container 11 or the inner surface of the outer container 12 and having a clearance between the inner surface of the outer container 12 or the outer surface of the inner container 11, and a sealing part 28 arranged at either the inner container 11 or the outer container 12, vacuum evacuating an inner space 43 between the inner container 11 and the outer container 12 to make a vacuum space and thereafter sealed. It is possible to prevent the container from being deformed into an indefinite shape even if it is exposed under a high temperature for a prdetermined period of time, its size is compact and it is further possible to improve remarkably its heat insulation performance. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a vacuum heat insulating container.

  Patent Document 1 discloses a vacuum heat insulating container that is composed of a double container including an inner container and an outer container, and in which a space between the inner container and the outer container is evacuated.

  As shown in FIG. 12, the vacuum heat insulating container 110 having such a double container structure is similar to a thermos for storing water, for example, and when exposed to a high temperature such as a fire, the outer container 112 is It is heated and becomes high temperature. If it becomes so, the intensity | strength of the outer side container 112 will fall, and the inner side container 111 will be collapsed at a stretch at a certain time. This is because the outer container of the thermos is generally designed to be thick enough to withstand atmospheric pressure, and the inner container is designed to be thin in order to improve the heat insulation performance. As a result, the thin inner container 111 is crushed into an indeterminate shape, and there is a problem that the contents 114 cannot be taken out from the mouth.

  In order to prevent the deformation, when the strength is increased with the same material, a method of increasing the thickness of the container can be considered. However, when the thickness of each container is increased, the heat conduction increases, which causes a problem that the heat insulating performance is reduced and the weight is increased.

  In addition, the outer container is arranged so as to have a gap around the inner container, and a highly heat-insulating support that connects the inner container and the outer container is provided at a predetermined position between the inner container and the outer container, and the gap is evacuated. A vacuum heat insulating container is disclosed in Patent Document 2.

  When the vacuum heat insulating container has such a structure, the mechanical strength can be secured without increasing the thickness of the container, and even a container other than a simple shape such as a sphere can be formed. There is a merit. On the other hand, even if the support has low thermal conductivity, it cannot be completely insulated, so the heat outside the outer container is transferred to the inner container through the support, and the heat insulation performance of the vacuum insulation container decreases. Occurs. Moreover, this disadvantage is significant when the temperature is high such as a fire.

JP 2005-139678 A JP 2001-128860 A

  An object of the present invention is to provide a vacuum heat insulating container that can be prevented from being deformed indefinitely even when exposed to a high temperature for a certain period of time and that is compact and can significantly improve heat insulating performance.

  As means for solving the above problems, the vacuum heat insulating container of the present invention is disposed so as to surround an inner container having a first opening opened at one end with a predetermined gap from the inner container, An outer container provided at one end with an opened second mouth part fixed to the outer surface of the first mouth part, and disposed on the outer surface of the inner container or the inner surface of the outer container; After the heat-resistant core material having a gap between the outer surface of the inner container and the inner container or the outer container, the inner space between the inner container and the outer container is evacuated to form a vacuum space And a sealed portion that is sealed.

  According to this configuration, by arranging the heat-resistant core material between the inner container and the outer container, the outer container immediately hits the heat-resistant core material even if the outer container is suddenly deformed, so that the shape of the outer container is maintained. In addition, the outer container does not come into direct contact with the inner container, and has a vacuum space in the gap between the heat-resistant core material and the outer surface of the inner container or the inner surface of the outer container. There is no transmission. Therefore, even if the vacuum heat insulating container is exposed to a high temperature for a certain time, the vacuum heat insulating container can be prevented from being deformed into an indefinite shape. In addition, the vacuum insulation container need not be excessively increased in strength than the heat-resistant core material disposed in the inner container or the outer container, and can be made compact, and the heat insulation performance can be remarkably improved.

  It is preferable that a protrusion projecting into the internal space is provided at a predetermined position of the inner container or the outer container. According to this configuration, when the outer container of the vacuum heat insulating container is deformed, the protrusion at a predetermined position of the inner container or the outer container comes into contact with the inner container or the outer container on the side where the protrusion is not provided. Thereby, the vacuum space between the inner container and the outer container in other parts that are not in contact with each other is secured. Thereby, heat insulation performance can be improved markedly. As a result, the vacuum heat insulating container can be prevented from being deformed into an indefinite shape even after the vacuum heat insulating container is exposed to a high temperature.

  It is preferable that the protrusion is provided in the outer container or the inner container in which the heat resistant core material is not disposed.

  It is preferable that a metal foil is disposed on the outer surface or inner surface of the heat resistant core material so as not to contact the inner surface of the outer container or the outer surface of the inner container. According to this structure, a radiant heat can be blocked | prevented and heat insulation performance can be improved significantly. Further, the metal foil does not come into contact with either the inner container or the outer container and does not conduct heat.

  It is preferable that the sealing portion is sealed with a stainless steel tip tube joined to the exhaust hole. According to this configuration, the heat insulating performance can be maintained up to the melting point of stainless steel.

  According to the present invention, by disposing the heat-resistant core material between the inner container and the outer container, even if the outer container is deformed, it immediately hits the heat-resistant core material when it begins to deform. It does not lead to. Therefore, the shape of the outer container is maintained. In addition, the outer container does not come into direct contact with the inner container, and has a vacuum space in the gap between the heat-resistant core material and the outer surface of the inner container or the inner surface of the outer container. Is never transmitted. Therefore, even if the vacuum heat insulating container is exposed to a high temperature for a certain time, the vacuum heat insulating container can be prevented from being deformed into an indefinite shape. In addition, the vacuum insulation container need not be excessively increased in strength than the heat-resistant core material disposed in the inner container or the outer container, and can be made compact, and the heat insulation performance can be remarkably improved. In other words, while the vacuum insulation container can be made compact, the performance without the heat-resistant core material is maintained until the outer container is deformed by heat, and the performance with the heat-resistant core material is maintained even at a temperature at which the outer container is deformed. Insulation performance can be maintained for a long time.

  When the outer container of the vacuum heat insulating container is deformed, the protrusion at a predetermined position of the inner container or the outer container is in contact with the inner container or the outer container on the side where the protrusion is not provided. A vacuum space between the inner container and the outer container in a part is secured. Thereby, heat insulation performance can be improved markedly. As a result, the vacuum heat insulating container can be prevented from being deformed into an indefinite shape even after the vacuum heat insulating container is exposed to a high temperature.

  By disposing the metal foil on the outer surface or inner surface of the heat-resistant core material so as not to come into contact with the inner surface of the outer container or the outer surface of the inner container, radiant heat can be prevented and the heat insulating performance can be significantly improved. The metal foil does not contact either the inner container or the outer container, and does not transfer heat.

  By sealing the sealing portion with a stainless steel chip tube joined to the exhaust hole, the heat insulating performance can be maintained up to the melting point of stainless steel.

Sectional drawing which shows the vacuum heat insulation container of 1st Embodiment of this invention. The figure which shows the standard temperature curve of the standard heating test with respect to the fireproof safe defined by JIS. The figure which shows the relationship between the temperature and intensity | strength of stainless steel. Sectional drawing which shows the vacuum heat insulation container of 1st Embodiment deform | transformed by heat. Sectional drawing which shows the vacuum heat insulation container of 2nd Embodiment of this invention. The figure which shows fixation of the heat-resistant core material and metal foil by the fixing member in the VI-VI line cross section of FIG. Sectional drawing which shows the vacuum heat insulation container of 2nd Embodiment deform | transformed by heat. The figure which shows a vacuum heat insulation container provided with two protrusions in the linear part of an outer container. The figure which shows a vacuum heat insulation container provided with two protrusions in the linear part of an inner container. The figure which shows a vacuum heat insulation container provided with two protrusions in the linear part of the outer container deform | transformed by the heat. The figure which shows a vacuum heat insulation container provided with two protrusions in the linear part of the inner container which deform | transformed by heat. Sectional drawing which shows a vacuum heat insulation container provided with the conventional double container. Sectional drawing which shows the vacuum heat insulation container provided with the conventional double container in which both the outer container and the inner container deform | transformed.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows an example of a vacuum heat insulating container 10 according to a first embodiment of the present invention, which is applied to a fireproof safe. The vacuum heat insulating container 10 includes an inner container 11, an outer container 12 disposed outside the inner container 11, a lid 13, and a lid fixing member 14. A heat-resistant core material 37 and a metal foil 38 are disposed in an internal space 43 between the inner container 11 and the outer container 12. In the following description, the side to which the lid 13 of the vacuum heat insulating container 10 is attached is defined as the upper side.

  The inner container 11 is made of stainless steel (SUS304), and includes a first inner container member 16 provided with a first opening 15, a second inner container member 17 located at an intermediate portion, and a first inner container member 16. It is formed by joining the third inner container member 18 located at the opposite end.

  The first inner container member 16 has a thickness of 0.8 mm. The first inner container member 16 is formed of a first cylindrical portion 16a, a curved surface portion 16b, a flat portion 16c, and a second cylindrical portion 16d from the second inner container member 17 side. The curved surface portion 16b is a curved surface that is reduced in diameter so that the diameter gradually decreases in the axial direction upward of the first cylindrical portion 16a, and the one side is the first cylindrical portion 16a and the other side is the axial direction of the first cylindrical portion 16a. Is continuous with a flat portion 16c having a flat surface in a direction orthogonal thereto. The second cylindrical portion 16d is formed so as to protrude in a cylindrical shape from the end surface on the center side of the inner container 11 of the flat portion 16c. And the said 2nd cylindrical part 16d comprises the 1st opening part 15 opened to one end in the inner container 11 of a joining state.

  The second inner container member 17 is a cylindrical member formed to have the same thickness and the same diameter as the first cylindrical portion 16a of the first inner container member 16.

  In the third inner container member 18, a cylindrical portion 18a having the same thickness and the same diameter as the second inner container member 17 and a first closing surface portion 18c facing the first mouth portion 15 are continuous by a curved surface portion 18b. It is formed in a saucer shape. The curved surface portion 18b is a curved surface that is reduced in diameter so that the diameter gradually decreases in the axially downward direction.

  The outer container 12 is made of stainless steel (SUS304) similar to the inner container 11, and includes a first outer container member 22 provided with a second mouth portion 21, a second outer container member 23 positioned at an intermediate portion, The first outer container member 22 is provided with a third outer container member 24 positioned at the opposite end, and these are joined to the outside of the inner container 11 with a predetermined gap therebetween. .

  The first outer container member 22 has a thickness of 1.5 mm. The first outer container member 22 is formed of a first cylindrical portion 22a, a curved surface portion 22b, a flat portion 22c, and a second cylindrical portion 22d from the second outer container member 23 side. The curved surface portion 22b is a curved surface that is reduced in diameter so that the diameter gradually decreases upward in the axial direction of the first cylindrical portion 22a, and the one side is the first cylindrical portion 22a and the other side is the axial direction of the first cylindrical portion 22a. Is continuous with a flat portion 22c having a flat surface in a direction orthogonal thereto. The second cylindrical portion 22d is formed so as to protrude in a cylindrical shape from the end surface on the center side of the outer container 12 of the flat portion 22c. The second cylindrical portion 22d has a diameter with which the inner surface contacts the outer surface of the first mouth portion 15, and is fixed to the outer surface of the first mouth portion 15 at one end of the outer container 12 in the joined outer container 12. The opened second mouth portion 21 is configured. In addition, an exhaust hole (sealing portion) 28 is provided in the first cylindrical portion 22 a of the first outer container member 22.

  A tip pipe 29 that connects the inside and the outside of the outer container 12 is joined to the exhaust hole 28 by welding. The exhaust hole 28 is sealed by sealing the tip tube 29 after evacuating the internal space 43 between the inner container 11 and the outer container 12 to form a vacuum space. The tip tube 29 is made of stainless steel (SUS304). Thereby, heat insulation performance can be maintained to the melting point of stainless steel. The tip tube 29 is provided with a tip tube cover 44 made of stainless steel (SUS304).

  The second outer container member 23 has a cylindrical shape formed to have the same thickness and the same diameter as the first cylindrical portion 22 a of the first outer container member 22. Protrusions 30 are provided on the outer peripheral surface of the second outer container member 23 at a central position in the axial direction of the second outer container member 23 with a predetermined interval in the circumferential direction. In the present embodiment, the protrusions 30 are provided to protrude into the internal space 43 at 90 ° intervals in the circumferential direction of the second outer container member 23. The protrusion 30 has a certain length in the circumferential direction of the second outer container member 23. The protrusion 30 is provided so as to be recessed inward in the radial direction so that a cross section viewed from the side forms a semicircular shape. In the present embodiment, it is in the form of being immersed by a press or the like.

  In the third outer container member 24, a cylindrical portion 24a having the same thickness and the same diameter as the second outer container member 23 and a second closing surface portion 24c facing the second mouth portion 21 are continuous by a curved surface portion 24b. It is formed in a saucer shape. The curved surface portion 24b is a curved surface that is reduced in diameter so that the diameter gradually decreases in the axially downward direction.

  In the following description, the first cylindrical portion 22a of the first outer container member 22 of the outer container 12, the cylindrical portion 24a of the second outer container member 23, and the third outer container member 24 are parallel to the axis of the vacuum heat insulating container 10. The portion is referred to as a straight portion 51.

  The lid 13 includes a first cylindrical portion 32 and a second cylindrical portion 33. The first cylindrical portion 32 has a size that fits into the first mouth portion 15 of the inner container 11. The second cylindrical portion 33 has an outer diameter larger than the outer diameter of the first mouth portion 15. The second cylindrical portion 33 is disposed coaxially with the first cylindrical portion 32, and the lid 13 is integrally formed. The second cylindrical portion 33 is positioned in the axial direction of the lid 13 in contact with the upper surface of a mounting member 26 described later in a state where the first cylindrical portion 32 is fitted in the first mouth portion 15 of the inner container 11. Part 34 is provided. The lid 13 is formed from a ceramic board. Although the usable temperature of a ceramic board changes with components, it is 1000-1600 degreeC.

  The lid fixing member 14 is a flat plate made of stainless steel (SUS304) having a surface that comes into contact with the upper end surface of the second cylindrical portion 33 exposed outside the attached state of the lid 13. In the state where the first cylindrical portion 32 of the lid 13 is fitted to the first mouth portion 15 of the vacuum heat insulating container 10 and the lid fixing member 14 is brought into contact with the second cylindrical portion 33, the lid fixing member 14 is vacuumed. A through hole 35 is disposed so as to be in the same position as the nut 27 fixed to the mounting member 26 of the heat insulating container 10.

  The attachment member 26 is provided on the outer surface from the flat portion 22 c to the curved surface portion 22 b of the outer container 12 so that the upper surface thereof is a surface orthogonal to the axis of the vacuum heat insulating container 10. The attachment members 26 are located on both sides of the second mouth portion 21 and are provided one by one so as to have a larger interval than the outer diameter of the second cylindrical portion 33 of the lid 13. A nut 27 is fixed to the upper surface of each mounting member 26. When the vacuum heat insulating container 10 is assembled, the upper surface of each mounting member 26 is positioned such that the top surface of the first mouth portion 15 and the top surface of the second mouth portion 21 are all on the same plane. Three or more nuts 27 fixed to the attachment member 26 may be provided around the second mouth portion 21.

  The heat resistant core material 37 is disposed on the outer surface of the inner container 11 so as to have a gap between the inner surface of the outer container 12. The heat-resistant core material 37 is positioned by positioning an end portion as close as possible to the second cylindrical portion 16 d in the flat portion 16 c of the first inner container member 16. The first inner container member 16, the second inner container member 17, and the third inner container member 18 excluding the second cylindrical portion 16d are covered with a heat-resistant core material 37 without any gap. The heat-resistant core material 37 is made of ceramic wool and has both heat insulation and heat resistance. Although the usable temperature varies depending on the components, it is 1000 to 1600 ° C.

  The metal foil 38 is disposed on the outer surface of the heat-resistant core material 37 so as not to contact the inner surface of the outer container 12. The metal foil 38 is copper foil, aluminum foil or the like. The metal foil 38 in this embodiment is a copper foil. The metal foil 38 has a function of preventing the radiant heat from being transmitted from one side to the other side with respect to the surface forming the metal foil 38. The metal foil 38 covers the heat-resistant core material 37 together with the inner container 11 without a gap. The heat-resistant core material 37 is covered with a metal foil 38 together with the inner container 11, and a wire 39 as a holding means is wound around and attached to the metal foil 38.

  A getter 41 that adsorbs gas is disposed on the inner surface of the flat portion 22 c of the first outer container member 22 via a getter mounting member 42.

  When assembling the vacuum heat insulating container 10 having the above-described configuration, first, the first inner container member 16, the second inner container member 17, and the third inner container member 18 constituting the inner container 11 are joined by welding.

  Next, the metal foil 38 is placed on the flat surface of the work table, and the heat-resistant core material 37 is further placed on the metal foil 38. Then, the inner container 11 is placed so that the first closing surface portion 18c of the third inner container member 18 is positioned near the center of the upper surface of the heat-resistant core material 37, and the axis of the inner container 11 is in the horizontal direction. The inner container 11 is wrapped by folding the heat-resistant core material 37 together with the metal foil 38. Then, the heat-resistant core is wound around the circumferential direction with a wire 39 at two locations on the second inner container member 17 near the first inner container member 16 and on the second inner container member 17 near the third inner container member 18. The material 37 and the metal foil 38 are attached to the inner container 11. Thereafter, the heat-resistant core material 37 and the metal foil 38 are attached to the inner container 11 so as to cover the curved surface portion 16b and the flat portion 16c together with the heat-resistant core material 37 with the metal foil 38. At that time, the metal foil 38 is prevented from contacting the inner container 11 and the outer container 12 to be joined to the inner container 11 later.

  Next, the outer surface of the first mouth portion 15 of the inner container 11 is aligned with the inner surface of the second mouth portion 21 of the first outer container member 22 to which the mounting member 26 is joined, and the top surface and the second mouth of the first mouth portion 15 are aligned. It joins by welding so that the top surface of the part 21 may become the same plane. At that time, a predetermined gap is formed between the first cylindrical portion 16 a of the first inner container member 16 and the first cylindrical portion 22 a of the first outer container member 22. And inside the thing joined by welding the 2nd outer container member 23 and the 3rd outer container member 24 beforehand, the part of inner container 11 of what joined the 1st outer container member 22 to inner container 11 is contents. The first cylindrical portion of the first outer container member 22 is inserted so that a gap having the same gap as the predetermined gap is formed between the container 11 and the second outer container member 23 and the third outer container member 24. The lower end edge of 22a and the upper end edge of the 2nd outer container member 23 are joined by welding. In the present embodiment, the second outer container member 23 is joined to the third outer container member 24 in advance, but is not limited thereto, and may be joined to the first outer container member 22 in advance.

  Next, the exhaust pipe of the exhaust device is connected to the tip pipe 29 of the outer container 12 and evacuated to a predetermined vacuum level. When the specified vacuum degree is reached by evacuation, whether or not there is a leak in the vacuum space 43 formed between the inner container 11 and the outer container 12 by the leak test device while maintaining the vacuum degree. To test. As a result, when it is confirmed that there is no leak, the chip tube 29 is sealed and unnecessary portions are cut. Then, a tip tube cover 44 made of stainless steel (SUS304) is attached to the outer periphery of the remaining tip tube 29.

  Note that the getter 41 disposed in the vacuum space 43 is activated by being heated in a predetermined high temperature atmosphere in the exhaust process. Alternatively, the evacuation step is performed in an atmosphere at a temperature that is not activated or at normal temperature, and after the sealing of the exhaust holes 28 (chip tubes 29 in the present embodiment) is completed, the plurality of vacuum heat insulating containers 10 are collected. It is activated by being placed in a heating furnace and heated at a high temperature.

  The lid 13 of the vacuum heat insulating container 10 is attached by pushing the lid 13 until the positioning portion 34 of the lid 13 comes into contact with the upper surface of the attachment member 26 and inserting the first cylindrical portion 32 of the lid 13 into the first opening 15 of the inner container 11. Then, the lid fixing member 14 is placed on the second cylindrical portion 33 so that the through hole 35 of the lid fixing member 14 matches the position of the nut 27 of the vacuum heat insulating container 10. Thereafter, the cover 13 is fixed to the outer container 12 via the cover fixing member 14 by tightening a screw 45 made of stainless steel (SUS304) into the mounting member 26.

  When accommodating the contents in the vacuum heat insulating container 10, the fixing of the lid fixing member 14 to the outer container 12 is released by loosening the screw 45. Then, the lid 13 is removed, and the contents are inserted and accommodated from the first mouth portion 15 of the inner container 11. Thereafter, the lid 13 is fixed to the outer container 12 as described above.

  Here, the fireproof safe refers to a material that has passed the standard in a standard heating test set assuming fire based on JIS (Japanese Industrial Standards). The test method of the standard heating test is as follows. The safe is placed in the furnace, heated for a specified time according to the standard temperature curve defined by JIS, and after the heating, it is allowed to cool naturally in the furnace, and the judgment is made according to the subsequent state. A safe that has passed the standard is one that does not rupture, maintains a locked state, and is readable by newspapers placed in the safe.

  In FIG. 2, the standard temperature curve of the standard heating test with respect to the fireproof safe defined by JIS is shown. Standard heating test includes 30 minute standard heating test (maximum temperature reached 843 ° C), 1 hour standard heating test (maximum temperature reached 927 ° C), 2 hour standard heating test (maximum temperature reached 1010 ° C), 3 hour standard heating test (Maximum temperature reached 1052 ° C.) A 4-hour standard heating test (maximum temperature reached 1093 ° C.) is set. In this embodiment, the inner container 11, the outer container 12, the lid fixing member 14 and the screw 45 of the vacuum heat insulating container 10 are made of stainless steel (SUS304), and the melting point of SUS304 is 1400 to 1450 ° C. so that it does not melt. . Moreover, it is not limited only to stainless steel (SUS304). Further, the usable temperature of the lid 13 varies depending on the components and is 1000 to 1600 ° C., but one that can withstand the standard heating test is used.

  This inventor experimented in order to confirm an effect whether the vacuum heat insulation container 10 concerning this invention can endure the said standard heating test.

  When heating of the vacuum heat insulating container 10 in the furnace is started, first, the temperature of the outer container 12 in contact with the space in the furnace starts to rise.

  As shown in FIG. 3, when the temperature of stainless steel (SUS304) rises, the longitudinal elastic modulus decreases and the rigidity decreases. As a result, deformation due to atmospheric pressure cannot be avoided.

  As a result of the experiment by the inventors of the present application, the vacuum heat insulating container 10 started to deform at 1050 ° C. in the body of the outer container 12.

  Since the inner space 43 of the vacuum heat insulating container 10 is in a vacuum, the outer container 12 whose rigidity has been lowered is deformed to the inner space 43 side, particularly the linear portion 51. As shown in FIG. 4, due to the deformation, the tip 55 of the protrusion 30 of the second outer container member 23, which is the straight portion 51, comes into contact with the inner container 11 through the metal foil 38 and the heat-resistant core material 37. As a result, a vacuum space is secured in the internal space 43 in a range other than the tip 55 of the projecting portion 30 in contact. Since the tip 55 of the protrusion 30 of the outer container 12 and the inner container 11 are in contact with each other at a point, heat transfer from the outside to the inner container 11 occurs, but is extremely small enough to withstand a fire resistance test of up to 4 hours. It is. As long as there is a vacuum space 43 between the outer container 12 and the inner container 11, there is no heat transfer from the outside to the inner container 11 through the vacuum space 43. 11 does not cause an increase in temperature, and the inner container 11 is not deformed.

  Thus, by disposing the heat-resistant core material 37 between the inner container 11 and the outer container 12, the outer container 12 maintains its shape even when the outer container 12 is suddenly deformed. There is no direct contact, and since the vacuum space 43 is provided in the gap between the heat-resistant core material 37 and the outer surface of the inner container 11 or the inner surface of the outer container 12, heat is transmitted from the outer container 12 to the inner container 11. Is never transmitted. Therefore, even if the vacuum heat insulating container 10 is exposed to a high temperature for a certain time, the vacuum heat insulating container 10 can be prevented from being deformed into an indefinite shape. Further, by disposing the heat-resistant core material 37 in the inner container 11 or the outer container 12, it is possible to make the vacuum insulating container 10 compact without having to increase the strength of the vacuum insulating container 10 excessively, and the heat insulating performance can be remarkably improved. In other words, while the vacuum insulation container can be made compact, the performance without the heat-resistant core material is maintained until the outer container is deformed by heat, and the performance with the heat-resistant core material is maintained even at a temperature at which the outer container is deformed. Insulation performance can be maintained for a long time. In addition, by disposing metal foil on the outer surface or inner surface of the heat-resistant core material so as not to contact the inner surface of the outer container or the outer surface of the inner container, it is possible to prevent radiant heat and significantly improve the heat insulation performance. it can. The metal foil does not contact either the inner container or the outer container, and does not transfer heat.

  FIG. 5 shows the vacuum heat insulating container 10 of the second embodiment. In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  The protrusions 30 are provided on the outer peripheral surface of the second inner container member 17 at a center position in the axial direction of the second inner container member 17 with a predetermined interval in the circumferential direction. In the present embodiment, the protrusions 30 are provided to protrude into the internal space 43 at 90 ° intervals in the circumferential direction of the second inner container member 17. The protrusion 30 has a certain length in the circumferential direction of the second inner container member 17. The protrusion 30 is provided so as to be recessed radially outward so that a cross section viewed from the side forms a semicircular shape. In the present embodiment, it is in the form of being immersed by a press or the like.

  The heat-resistant core material 37 is disposed on the inner surface of the outer container 12 so as to have a gap between the outer surface of the inner container 11.

  The metal foil 38 is disposed on the inner surface of the heat-resistant core material 37 so as not to contact the outer surface of the inner container 11. The inner surface of the outer container 12 other than the second cylindrical portion 22 d is covered with the heat-resistant core material 37 without gaps by the metal foil 38. As shown in FIG. 6, the heat-resistant core material 37 and the metal foil 38 are fixed to the inner surface of the outer container 12 by expanding a spring-like fixing member 59. With respect to the entire inner surface of the outer container 12, the heat-resistant core material 37 and the metal foil 38 are securely fixed by a plurality of spring-like fixing members 59 as holding means. When it is difficult to fix the heat-resistant core material 37 and the metal foil 38 inside the curved surface portion 22 b and the flat portion 22 c of the outer container 12, the ends of the heat-resistant core material 37 and the metal foil 38 are connected to the upper ends of the straight portions 51. It may be up to.

  A getter 41 that adsorbs gas is disposed on the outer surface of the flat portion 16 c of the first inner container member 16 via a getter mounting member 42.

  When the heat-resistant core material 37 is made of ceramic wool and the internal space 43 can be vacuum sucked through the exhaust hole 28, the heat-resistant core material 37 is made of ceramic board and the second opening 21 side of the heat-resistant core material 37. When the vacuum suction can be performed from the gap in the vicinity of the end portion, or when the heat-resistant core material 37 is not disposed only at the position of the exhaust hole 28, it may be disposed in the outer container 12. Further, the exhaust hole 28 may be disposed in the inner container 11 without being disposed in the outer container 12.

  Also in this embodiment, the point that the straight portion 51 of the outer container 12 is deformed to the inner space 43 side due to the temperature rise of the outer container 12 is the same as that of the first embodiment. However, as shown in FIG. The 12 straight portions 51 are different in that they contact the tip 55 of the protrusion 30 of the inner container 11 through the heat-resistant core material 37 and the metal foil 38. Also in this case, as in the first embodiment, the vacuum space 43 is ensured in the internal space 43 in a range other than the tip 55 of the projecting portion 30 in contact. As long as there is a vacuum space 43 between the outer container 12 and the inner container 11, there is no heat transfer from the outside to the inner container 11 through the vacuum space 43, so there is no significant temperature rise and no deformation occurs in the inner container 11. In addition, since the tip 55 of the protrusion 30 of the outer container 12 and the inner container 11 are in point contact via the heat-resistant core material 37 and the metal foil 38, heat transfer from the outside to the inner container 11 occurs. However, it is very small enough to withstand a fire resistance test of up to 4 hours.

  The vacuum heat insulating container 10 of the present invention is not limited to the configuration of the above embodiment, and various modifications can be made.

  For example, when the outer container 12 is constituted by the first outer container member 57 and the second outer container member 58, and both the first outer container member 57 and the second outer container member 58 have linear portions 57a, 58a. In some cases, as shown in FIG. 8, one protrusion 30 may be provided in each of the straight portions 57a and 58a of the outer container 12, or as shown in FIG. 9, the straight portion 57a of the outer container 12 is provided. , 58a may be provided with one protrusion 30 on the inner container 11 at a position corresponding to the center in the axial direction. Even in such a structure, as shown in FIGS. 10 and 11, the tip 55 of one protrusion 30 of the outer container 12 and the inner container 11 has the other, the heat-resistant core material 37 and the metal foil 38. It is the same as the vacuum heat insulation container 10 of 1st Embodiment and 2nd Embodiment that the vacuum space is ensured in the internal space 43 of the range other than the front-end | tip 55 of the protrusion 30 contacted | abutted through. is there.

  The heat-resistant core material 37 may be provided on both the outer surface of the inner container 11 and the inner surface of the outer container 12. At that time, a gap is provided between one heat-resistant core material and the other heat-resistant core material.

  In the first embodiment and the second embodiment, the protrusion 30 is provided integrally with the inner container 11 or the outer container 12, but is arranged separately on the outer surface of the inner container 11 and the inner surface of the outer container 12. You may set up.

  In addition, the heat-resistant core material 37 is not disposed between the inner container 11 and the outer container 12, and the distance between the inner container 11 and the outer container 12 is prevented from contacting the inner container 11 even when the outer container 12 is thermally expanded. It is conceivable that more vacuum spaces 43 are provided by expanding the inner space, but this is not preferable because the capacity of the inner container 11 is reduced or the outer shape of the outer container 12 is increased.

  In the above-described embodiment, the fireproof safe has been described as an example. However, the present invention is not limited to the fireproof safe and can be applied to a container such as a thermos.

DESCRIPTION OF SYMBOLS 10 Vacuum heat insulation container 11 Inner container 12 Outer container 13 Lid 14 Lid fixing member 15 1st opening part 16 1st inner container member 16a, 22a 1st cylindrical part 16b, 22b Curved part 16c, 22c Flat part 16d, 22d 2nd cylinder Part 17 Second inner container member 18 Third inner container member 18a, 24a Cylindrical part 18b, 24b Curved surface part 18c First closing surface part 21 Second port 22 First outer container member 23 Second outer container member 24 Third outer container Member 24c Second closing surface portion 26 Mounting member 27 Nut 28 Exhaust hole (sealing portion)
29 Tip tube 30 Protruding portion 32 First cylindrical portion 33 Second cylindrical portion 34 Positioning portion 35 Through hole 37 Heat-resistant core material 38 Metal foil 39 Wire (holding means)
41 Getter 42 Getter mounting member 43 Internal space (vacuum space)
44 Tip tube cover 45 Screw 51 Linear portion 55 Tip 57 First outer container member 57a Linear portion 58 Second outer container member 58a Linear portion 59 Fixing member (holding means)

Claims (5)

An inner container having a first mouth opening at one end;
An outer container that is disposed so as to surround the inner container with a predetermined gap and is provided with an opened second mouth part fixed to the outer surface of the first mouth part at one end;
A heat-resistant core material disposed on the outer surface of the inner container or the inner surface of the outer container, and having a gap between the inner surface of the outer container or the outer surface of the inner container;
A vacuum provided in the inner container or the outer container and sealed after the inner space between the inner container and the outer container is evacuated to form a vacuum space. Insulated container.   The vacuum heat insulating container according to claim 1, wherein a protrusion protruding into the inner space is provided at a predetermined position of the inner container or the outer container.   The vacuum insulation container according to claim 1 or 2, wherein the protrusion is provided in the outer container or the inner container in which the heat-resistant core material is not disposed.   The metal foil is disposed on the outer surface or inner surface of the heat-resistant core material so as not to contact the inner surface of the outer container or the outer surface of the inner container. The vacuum insulation container according to claim 1.   The vacuum insulation container according to any one of claims 1 to 4, wherein the sealing portion is sealed by a stainless steel tip tube joined to the exhaust hole.

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