KR20170046638A - Heat-insulated container and heat insulation structure - Google Patents

Abstract

A heat insulating container for holding a substance lower than the normal temperature by 100 占 폚 or more and comprising a container inner tank 3, a container outer tank 2, a thermal insulating box provided between the inner tank 3 and the container outer tank 2, As shown in Fig. The heat insulating layer has a panel-shaped vacuum insulating material (9) having a sheathing material for vacuum sealing the core and the core, and a heat insulating material made of a material different from that of the vacuum insulating material (9). The vacuum insulator 9 has a heat stress distribution layer and is fixed to the heat insulating box.

Description

[0001] HEAT-INSULATED CONTAINER AND HEAT INSULATION STRUCTURE [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat insulating container and a heat insulating structure such as a low temperature tank for storing cryogenic materials such as Liquefied Natural Gas (LNG).

LNG carriers are typical examples of cryogenic materials such as LNG. LNG carriers include independent tank type and membrane type. The membrane type is composed of a primary sealing wall, a secondary sealing wall and a heat insulating wall. Generally, the heat insulating wall is formed by charging a heat insulating material such as pearlite or glass wool to the upper surface of a veneer or the like. Since the heat insulating wall needs to maintain a very low temperature material such as LNG at about -162 占 폚, the higher the heat insulating property, the better.

Therefore, a low-temperature tank having a vacuum insulating member provided with a heat insulating material such as pearlite between a tank inner tank and a tank outer tank, which is not a heat insulating container for an LNG transporting line, is proposed to improve the heat insulating property of the heat insulating container holding the cryogenic material See, for example, Patent Document 1).

FIG. 10 is a view showing a conventional heat insulating structure of a low temperature tank shown in Patent Document 1. FIG.

As shown in Fig. 10, the heat insulating structure of the low-temperature tank has a tank inner tank 101 and a tank outer tank 102. As shown in Fig. A powdered thermal insulating material 104 such as pearlite filled between the tank inner tank 101 and the tank outer tank 102 and the raw tool 103 filled between the tank inner tank 101 and the tank outer tank 102 have.

With this configuration, a vacuum region can be created in the powder insulating material 104 (among the non-vacuum insulating structure) between the in-tank tank 101 and the tank outer tank 102. Then, the heat insulating performance can be increased by the amount of the vacuum region.

However, in the above-described conventional construction, the heat insulating property is improved by an amount corresponding to the provision of the vacuum region, but the deep tool 103 becomes ultra-low temperature due to extremely low heat such as LNG in the tank inner tank 101. Particularly, since the raw tool 103 on the side of the tank inner tank 101 becomes extremely low temperature, it is necessary to form the raw tool 103 with a metal that can withstand the extremely low temperature, .

It is assumed that this configuration is applied to a heat insulating wall of an LNG carrier, that is, a phase of a veneer board or the like is filled with a thermal insulating material such as pearlite to form a heat insulating wall. In this case, when the cost increase of each heat insulating wall is accumulated by the number of sheets of several thousands of heat insulating walls to be used and totaled, the cost increasing rate becomes extremely high, and it is difficult to realistically realize the structure.

Japanese Patent Application Laid-Open No. 7-190297

The applicant has attempted vacuum insulation using a panel-shaped vacuum insulation material on the market as a general-purpose product instead of the jean tool disclosed in Patent Document 1.

Since this panel-shaped vacuum insulation material is a general-purpose product, it is inexpensive and it is possible to realize the suppression of a significant increase in cost. However, when used for a long period of time, pearlite or the like, which is a heat insulating material filled in the upper surface of the veneer panel, is reduced, and a clearance is formed between the vacuum insulating material and the inner surface of the inner surface of the casing. There is a sign that the vacuum insulator is micro-vibrated due to the vibration of the LNG hull due to the margin of clearance, the outer sheath rubs against the inner surface of the phase itself, scratches, and the vacuum is damaged by the scratches.

In particular, since the cryogenic material of a material such as LNG, which is conducted through a heat insulating material such as pearlite, is leaked from the jacket of the vacuum insulating material, the multilayer laminate film as the jacket material of the vacuum insulating material tends to be brittle at low temperatures. Therefore, research on the method of preparing a vacuum insulator is required.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to provide a heat insulating container and a heat insulating structure which can realize cost saving while ensuring high heat insulating performance over a long period of time.

A heat-insulating container of the present invention is a heat-insulating container for holding a substance lower than normal temperature by 100 ° C or more. The heat-insulating container has a container inner tank, a container outer tank, a heat insulating box provided between the inner tank and the inner tank, . The heat insulating layer has a panel-shaped vacuum insulating material having a sheathing material for vacuum-sealing the core and the core, and a heat insulating material made of a material different from that of the vacuum insulating material. Furthermore, the vacuum insulating material has a heat stress distribution layer and is fixed to the heat insulating box.

Further, the heat insulating structure of the present invention is a heat insulating structure having a container outer tank, a first heat insulating box and a second heat insulating box. The first heat insulating box is unitized by a first box frame body, a first heat insulating material provided in the first box frame body, and a first closing plate for closing the opening side of the first box frame body. A second heat insulation box, the second box frame body and the second box, the frame and the partition member for partitioning the inside second heat insulation box is provided in the body, laying (敷設) The vacuum heat insulating material on the bottom surface of the compartment defined by the partitioning member and, a second insulator, and a second box disposed in the opening of the vacuum heat insulating material Frame 2 for closing the open side It is unitized by the occlusion plate have. The second adiabatic box is disposed on the container outer tub side with respect to the first adiabatic box , and the vacuum insulator has thermal stress Has a dispersion layer, and the second It is fixed to the occlusion plate .

With this configuration, it is possible to secure insulation at low cost by using a panel-shaped vacuum insulation material, which is a general-purpose product, and at the same time, even if a gap is formed between the heat insulation materials in the insulation box, the vacuum insulation material does not vibrate , Deterioration of the heat insulating property due to damage of the sheathing material can be prevented. Therefore, the deterioration of the heat insulating performance due to the damage of the outer surface of the vacuum insulating material can be prevented, and the high heat insulating property can be ensured at low cost over a long period of time.

As described above, according to the present invention, it is possible to provide a heat insulating container and a heat insulating structure which can ensure a low heat insulating performance at low cost over a long period of time.

1 is a cross-sectional view of a heat-insulating container in a first embodiment of the present invention,
2 is a schematic view showing an internal structure of a heat insulating structure used in a heat insulating container according to the first embodiment of the present invention,
3 is a perspective view of a heat insulating structure used in a heat insulating container according to the first embodiment of the present invention,
4 is a cross-sectional view of a vacuum insulator used in a heat insulating structure used in a heat insulating container according to the first embodiment of the present invention,
5 is a plan view of a vacuum insulator used in a heat insulating structure used in a heat insulating container according to the first embodiment of the present invention,
6 is an explanatory diagram showing the result of thermal simulation of the heat insulating container in the first embodiment of the present invention,
7 is a view showing an experimental example in the first embodiment of the present invention,
8 is a sectional view showing a heat insulating structure of a heat insulating container according to a third embodiment of the present invention,
9A is a view showing an example of the configuration of an explosion-proof structure according to the fourth embodiment of the present invention,
FIG. 9B is a view showing another example of the configuration of the explosion-proof structure according to the fourth embodiment of the present invention,
10 is a view showing a conventional heat insulating structure of a low temperature tank shown in Patent Document 1. FIG.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to the embodiments.

(First Embodiment)

1 to 5 show the construction of the heat insulating container 1 in the first embodiment.

2 is a schematic diagram showing an internal structure of a heat insulating structure used in the same heat insulating container 1, and Fig. 3 is a schematic view showing the same heat insulating structure Fig. 5 is a plan view of the same vacuum insulator 9. Fig. 6 is a perspective view of the heat insulating container 1 according to the first embodiment. Fig. 4 is a cross- Fig. 7 is an explanatory diagram showing a result of a column simulation of the embodiment.

In the present embodiment, a configuration in the case of a membrane type in which a hull itself such as an LNG carrier is used as the heat insulating container 1 is shown.

As shown in Fig. 1, the heat insulating container 1 is constituted by the hull itself, and internal and external double insulation structures called primary heat radiation and secondary heat radiation are employed inside the container serving as a tank.

2 and 3, the heat insulating container 1 includes a container outer tank 2, a middle tank 4 provided on the inner side of the container outer tank 2, a container inner tank 4 provided through the middle tank 4, (3). The vessel inner tank (3) and the middle tank (4) are all made of a stainless steel membrane or Invar (36% nickel-containing nickel steel) and are resistant to heat shrinkage.

The first heat insulating box 5, which is a heat insulating structure disposed between the vessel inner vessel 3 and the middle vessel 4, is made up of a wooden box frame 6 (first box frame body) such as a veneer with one side opened, , And a powder thermal insulator 7 (first insulator) such as pearlite filled in the box frame body 6. [ The first heat insulator may be made of glass wool or the like instead of pearlite. In the present embodiment, the case where pearlite, which is the powder heat insulator 7, is used as the first heat insulator.

The second heat insulating box 8 disposed between the middle tank 4 and the vessel outer tank 2 is constructed by a box frame 6 of wood having one side open in the same manner as the first heat insulating box 5 A material having a thermal conductivity (?) Lower than that of the powder thermal insulator 7 (in the present embodiment, 0.002 W / (m 占 열) at a temperature of 0 占 폚 and about 20 times lower than that of pearlite (9). In the opening side portion thereof, a powder heat insulator 7 (second insulator) such as pearlite is filled in the same manner as the first heat insulator box 5.

In this embodiment, when the heat insulating box is formed, the interior of the box frame 6 is divided into a plurality of sections by the partition body 6a, the powder heat insulating material 7 is filled in each of the plurality of sections , And closed with a closing plate 10 made of the same material as that of the box frame body 6 to form a unit. The first heat insulating box 5 and the second heat insulating box 8 are constructed by disposing this unit.

Here, the second heat insulating box 8 is arranged so that the vacuum heat insulating material 9 faces the outer side, that is, on the container outer tank 2 side. Therefore, the powder thermal insulators 7 of the first and second heat insulating boxes 5 and 8 constitute the first heat insulating layer on the low temperature side, and the vacuum heat insulator 9 constitutes the second heat insulating layer.

In Fig. 4, a vacuum heat insulator 9 as a second heat insulating layer is shown.

As shown in Fig. 4, the vacuum insulator 9 includes a core material 11 enclosed in a shell material 12, decompresses and hermetically seals it, and is formed in a panel shape. The outer covering member 12 is composed of a first protective layer 13a made of a PET film having a thickness of 12 占 퐉 and a second protective layer 13b made of a nylon film having a thickness of 25 占 퐉, A gas barrier layer 14 made of a metal foil and a thermally welded layer 15 made of a low density polyethylene film having a thickness of 50 탆.

The vacuum insulator 9 is a vacuum insulator having a core member 11 having an average fiber length of 4 占 퐉 formed by firing a glass fiber formed by a centrifugal method and an adsorbent 16 containing calcium oxide as a main raw material, And the welding layers 15 are thermally bonded to each other so as to face each other. The heat-welded portion and the portion outside the heat-welded portion are formed with a sealing pin 17 in which the core member 11 is not present and the shell members 12 are in contact with each other.

Further, in the vacuum insulator 9 of the present embodiment, the thermal stress dispersion layer 18 is laminated on the outer sides of the top and bottom faces of the first protective layer 13a constituting the outer cover 12, have. That is, the outermost layer of the sheath material 12 is constituted by this thermal stress dispersion layer 18. The thermal stress dispersion layer 18 may be integrated with the first protective layer 13a by adhesion.

The thermal stress dispersive layer 18 is formed of a material having a small coefficient of linear expansion so that the thermal shrinkage is small and the resistance to ultra-low temperature and the mechanical strength are high. For example, in this embodiment, the thermal stress dispersion layer 18 is formed by glass cloth having a thickness of about 150 탆.

In this embodiment, the vacuum insulator 9 is provided with a closure for closing the container outer tank 2 side of the second thermal insulation box 8, with the thermal stress distribution layer 18 of the outer cover 12 interposed therebetween. Is adhered and fixed to the inner surface of the plate 10 (second closing plate) by an adhesive such as hot melt.

As the gas adsorbent contained in the adsorbent 16 of the vacuum insulator 9, a sorbent made of ZSM-5 type zeolite is used in the form of a powder having a large surface area. Further, among the ZSM-5 type zeolites, at least 50% or more of the copper sites of the ZSM-5 type zeolite are the copper monovalent sites in order to improve the nitrogen adsorption property at room temperature, At least 50% of the sites can be sorbent materials that are copper monovalent sites with an oxygen triple coordination.

As described above, by using a gas adsorbent having a higher proportion of copper monovalent sites in the three-coordinate system of oxygen, it is possible to significantly improve the adsorption amount of air.

The gas adsorbent used in this embodiment is ZSM-5 type zeolite, and is formed without using a combustible material. Thus, even when a combustible gas enters the vacuum insulator 9 due to aged deterioration or the like when the gas adsorbent is disposed inside the vacuum insulator used in a tank such as a combustible gas such as LNG, So that the vacuum insulator 9 can be constructed in a safe manner.

In addition, the vacuum insulator 9 of the present embodiment further improves the flame retardant structure. That is, by using the inorganic fibers in the core material 11 of the vacuum insulation material 9, the flame retardancy is improved as compared with the heat insulation material using the organic fibers, and as a result, the flame retardancy of the heat insulating container 1 can be improved. In addition, since the inorganic fibers are used, the volume expansion due to moisture in the base is small, and consequently, the formation of the heat insulating container 1 and the later-described explosion resistance can be improved.

Next, the operation and effect of the above-described configuration will be described.

The heat insulating container 1 is composed of a powder thermal insulator 7 in a first heat insulating box 5 disposed on the container inner tank 3 and a powder insulator 7 in a second heat insulating box 8 located on the container outer tank 2 side 7 and the vacuum heat insulator 9 positioned on the outside thereof, and the LNG in the container case is held at a low temperature.

Since the vacuum heat insulating material 9 is a general-purpose panel-shaped product, it can be provided at low cost, and the cost increase rate as a heat insulating structure can be greatly reduced. In addition, since the pearlite powder constituting the first insulating layer is provided at low cost, the above-mentioned heat insulating structure can be realized at low cost.

The vacuum insulator 9 is adhered and fixed to the closing plate 10 of the second heat insulating box 8. As a result, even if the powder thermal insulator 7 located on the inner tank 3 side of the vacuum insulator 9 is reduced by use for a long period of time and the volume is reduced and a clearance gap is formed in the second heat insulating box 8, The heat insulating material 9 does not vibrate in the second heat insulating box 8. Therefore, it is possible to prevent the occurrence of damages such as cracking and cracking of the casing member caused by micro-vibration of the vacuum insulation panel 9 in the second heat insulating box 8, and high heat insulation performance can be ensured over a long period of time.

The vacuum heat insulating material 9 is arranged outside the powder heat insulating material 7 of the second heat insulating box 8. The cryogenic temperature leaking from the cryogenic material in the in-vessel vessel 3 to the vacuum insulator 9 is first reduced by the heat insulating action by the powder insulator 7, thereby suppressing the low temperature embrittlement of the casing material 12 . Therefore, the vacuum insulator 9 can maintain its inherent high heat insulating performance, so that deterioration of the heat insulating performance due to the damage of the encapsulant 12 due to the low temperature embrittlement of the vacuum insulator 9 can be suppressed, High heat insulation can be ensured.

The first heat insulating layer for insulating the vessel inner tank 3 and the vacuum insulating material 9 from the powder thermal insulating material 7 of the first heat insulating box 5 to the powder thermal insulating material 7 of the second heat insulating box 8 So that they are separated from each other. Thereby, the wood of the box frame body 6 and the air layer between the box frame bodies 6 are present between them, and the material continuity (the first and second heat insulating boxes 5 and 8 The continuity in the case where the powder heat insulating material 7 in the container inner tank 3 side is continuous from the container inner tank 3 side to the vacuum insulating material 9) is cut off. As a result, the leakage amount of the heat can be reduced, and the low temperature embrittlement of the jacket material 12 of the vacuum heat insulating material 9 can be suppressed more effectively.

The heat conductivity? Of the vacuum heat insulating material 9 in the heat insulating structure of the present embodiment is smaller than that of the powder heat insulating material 7 in the first heat insulating box 5 and the second heat insulating box 8, It is about 20 times lower. As a result, the adiabatic effect by the vacuum heat insulator 9 is added, so that the heat insulating performance can be greatly improved as compared with the constitution comprising only the powder insulator 7.

Further, the vacuum insulation panel 9 can sufficiently block the outside heat by taking advantage of its high heat insulating performance, and can prevent the inside of the vacuum insulation panel 9, that is, the inside of the first heat insulation box 5 and the second heat insulation box 8, And the temperature of the atmosphere at the portion where the heat exchanger 7 is provided is greatly lowered. As a result, the heat insulating effect of the powder thermal insulating material 7 in the first and second heat insulating boxes 5 and 8 is relatively improved, and the high thermal insulating effect of the vacuum insulating material 9 itself is exerted So that the heat insulating performance can be made extremely high.

Fig. 6 is an explanatory view showing a result of the thermal simulation according to the first embodiment of the present invention. In the broken line A, two first heat-insulating boxes 5 made of conventional pearlite powder heat insulator are superimposed to make 530 mm ≪ / RTI > The one-dot chain line indicated by B shows the same characteristic as the present embodiment, which includes the second heat insulating box 8 having the vacuum heat insulating material 9 on the outer tank side of the first heat insulating box 5 .

6, in the configuration of the present embodiment, the outer surface temperature of the first heat insulating layer made of pearlite powder heat insulator is lowered from A to B by the heat insulating effect by the second heat insulating layer 9 consist of. That is, the vacuum heat insulator 9 lowers the atmospheric temperature of the installation portion of the first heat insulating layer. In addition, since the thermal gradient angle in the first heat insulating layer made of the pearlite powder heat insulator is gentle, the movement of the low heat in the first heat insulating layer itself is reduced, and the heat insulation effect by the first heat insulating layer Is improved.

7 is a diagram showing an experimental example in the first embodiment of the present invention.

In Fig. 7, the comparative example 1 is constituted by only the heat insulating layer, on which the vacuum heat insulating material 9 is not disposed. Experimental Example 1 is a measurement of the change in the heat conduction rate in the constitution in which the thickness of the heat insulating layer is the same as that of Comparative Example 1 and the vacuum heat insulator is provided on the outer wall side as the second heat insulating layer. Experimental Example 2 measures the thickness of the heat insulating layer in the case where the heat conduction rate is the same as that of Experimental Example 1 without the vacuum heat insulating material 9. [

As conditions for measuring these, the temperature in the tank was set to -160 캜 and the outside air temperature was set to 25 캜.

As the first heat insulating layer, a powder heat insulating material 7 such as pearlite is used and a vacuum heat insulating material 9 is used as a second heat insulating layer.

In Experimental Example 1, the thickness of the entire heat insulating layer was measured in the same manner as in Comparative Example 1, and the average heat conduction rate was measured. In this case, the average heat conduction rate was 0.0785 [W / m 2 · K] in Comparative Example 1, 0.0514 [W / m 2 · K] in Experimental Example 1, and the heat insulating performance was improved by 35%.

In Experimental Example 2, in order to obtain the same heat insulating performance as in Experimental Example 1, it is measured to what extent the entire heat insulating layer is thickened.

In this case, as compared with 530 [mm] of Experimental Example 1, Experimental Example 2 becomes 950 [mm], and in the conventional constitution, the heat insulating performance of Experimental Example 1 as in the present embodiment can be improved I could see that I could not get it.

As described above, for example, the use amount of the LNG can be suppressed by using the constitution of the present embodiment as a heat-insulating container (tank) such as an LNG tanker using the boil-off gas of LNG as fuel. Therefore, in the LNG tanker of the type in which the economical efficiency is improved and the boil-off gas of the LNG is re-liquefied, the energy loss for re-liquefaction can be reduced.

On the other hand, the vacuum insulator 9 is adhered and fixed to the inner surface of the second heat insulating box 8, that is, the closing plate 10 so that the vacuum insulator 9 and the second heat insulating box 8, The multilayer laminate film serving as the sheath material 12 of the vacuum insulator 9 can prevent the heat shrinkage stress due to the heat shrinkage of the plugging plate 10 from being affected by the difference in coefficient of linear expansion with the material of the plug 10, It may cause cracks to be generated.

In other words, by integrally adhering the vacuum insulator 9 to the occluding plate 10, the multilayer laminate film of the vacuum insulator 9 is stretched and contracted by heat shrinkage of the occluding plate 10, Cracks are generated by repetition of elongation and shrinkage, and the cracks may lower the heat insulating performance of the vacuum heat insulating material 9 and deteriorate the heat insulating performance thereof.

However, in the present embodiment, the vacuum heat insulating material 9 is adhered and integrated to the occluding plate 10 with the heat stress distribution layer 18 interposed therebetween. Therefore, it is possible to suppress cracks or the like of the shell material 12 due to heat shrinkage of the occluding plate 10.

That is, when the occlusion plate 10 is subjected to heat shrinkage, the tensile stretching force due to the heat shrinkage is applied to the sheath member 12 of the vacuum insulator 9. However, the thermal stress dispersion layer 18 constituting the outermost layer of the sheath material 12 is made of glass cloth, and has a small coefficient of linear expansion, little heat shrinkage, and is resistant to ultra-low temperature and high mechanical strength. As a result, the heat shrinkage force of the occluding plate 10 is hardly shrunk, and the heat shrinkage force is dispersed and absorbed, so that the heat shrinkage hardly occurs.

In other words, the thermal stress dispersion layer 18 is formed by laminating the thermal stress dispersion layer 18 on the gas barrier layer 14 made of an aluminum foil of the sheathing 12, The tensile shrinkage force caused by the tensile shrinkage force is prevented from acting, and the occurrence of cracks is strongly suppressed.

Particularly, the heat-shrinkage cracks tend to occur at the corners of the vacuum heat insulator 9, but the heat stress dispersion layer 18 receives and disperses the heat-shrinkage stress that tends to concentrate at the corner portions, thereby protecting the corner portions from thermal shrinkage stress , Cracks due to concentration of the heat shrinkage stress can be effectively suppressed.

Therefore, it is possible to prevent cracks from occurring in the gas barrier layer 14 of the shell material 12 even when used for a long period of time, to maintain the high heat insulating property of the vacuum heat insulating material 9 for a long period of time, Can be guaranteed.

Further, in this embodiment, glass cloth is used as the thermal stress dispersion layer 18. The glass cloth has a small coefficient of linear expansion, less thermal shrinkage, and is resistant to ultra-low temperature and high mechanical strength, and further has low thermal conductivity and high heat insulation. Thereby, it is possible to suppress the low temperature brittleness of the outer covering material 12 due to the extremely low temperature from the material stored in the inner container 3 of the container. Therefore, it is possible to suppress the occurrence of cracks due to low-temperature embrittlement of the sheath material 12, and it becomes possible to ensure the heat insulating property of the heat insulating container 1 over a longer period of time. Further, flame retardancy, durability, reliability and electrical insulation can be ensured without problems.

In addition, in the present embodiment, the thermal stress dispersion layer 18, which is the outermost layer of the outer cover 12 of the vacuum insulation panel 9, is integrally laminated on the upper and lower surfaces of the outer cover 12, . As a result, the outer covering 12 of the vacuum heat insulating material 9 can be prevented from cracking or cracking on the outer covering 12 due to handling at the time of production, because the outer surface of the outer covering 12 has a high strength. Therefore, the generation rate of defective products in the vacuum heat insulating material 9, which is likely to occur during the assembly process of the heat insulating structure, can be suppressed, and the heat insulating performance can be improved over a long period while suppressing the increase in cost.

The constitution of the present embodiment is also applicable to the structure of the vacuum heat insulating material 9 through the thermal stress dispersing layer 18 because cracks and bursting due to deterioration of the shell material 12 due to heat shrinkage and low temperature are likely to occur. And by carrying out a study of bonding and fixing, these problems are solved. Even if outside air enters the outer cover 12 due to any reason, in the configuration of the present embodiment, since the core 11 made by firing the glass fiber is used, the firing is not performed The dimensional change can be greatly suppressed, and the safety can be enhanced.

For example, when the core member 11 formed by the centrifugal method is used without performing firing, the dimensional deformation becomes twice or more, and the thickness becomes thick to about 5 to 6 times. On the other hand, according to the configuration of the present embodiment, the dimensional deformation can be suppressed to about 1.2 times and not more than 1.5 times, so that it is possible to suppress the damage caused by dimensional deformation in the inner wall and outer wall of the tank.

It is also possible to suppress the deformation of the core material 11 due to this moisture and the deformation of the vacuum insulator 9 itself even if moisture remains in the jacket material 12 of the vacuum insulator 9. [ Therefore, when the maintenance such as hot water washing is performed regularly, such as the LNG heat insulating container, the vacuum heat insulating material 9 is largely expanded and deformed at the time of hot water washing, and the vacuum heat insulating material 9 itself is largely thermally expanded and deformed, It is possible to suppress the damage caused by deforming the inner wall and the outer wall of the tank.

In this embodiment, the core member 11 is formed by a centrifugal method. For example, a core member 11 formed by a papermaking method for dehydrating a core member containing moisture to form paper, May be used.

In the case of using the core material 11 formed by the papermaking method, the fibers are dispersed in water in advance to disperse the fibers, and then dehydrated to form less deformation and smaller thickness in the case of reducing the pressure to atmospheric pressure. Therefore, even in the case of the resonance as described above, it is possible to suppress the damage caused by the dimensional deformation.

(Second Embodiment)

Next, a second embodiment of the present invention will be described.

The constitution of the second embodiment is the same as the constitution shown in Figs. 1 to 5, but the constitution of the first protective layer 13a and the second protective layer 13b of the jacket material 12 of the vacuum insulator 9 , And the material on the side of the first insulating layer is made of a material having a low resistance to low-temperature hardenability, on the side opposite to the material on the side in contact with the container outer tank 2.

For example, the material of the vacuum insulator 9 on the side in contact with the powder thermal insulator 7 is made of a material in which the laminate film is coated with an aluminum foil, and the material on the side opposite to the side of the vacuum insulator 9 in contact with the container outer tank 2 Is a material obtained by aluminum-deposited coating a laminate film. Alternatively, the protective layer on the side of the vacuum insulator 9 on the side in contact with the powder thermal insulator 7 is of a multiple construction, and the protective layer on the side opposite to the protective layer on the side contacting the vessel outer tank 2 has a single structure.

This makes it possible to further enhance the low-temperature curability of the casing member 12 of the vacuum insulation member 9 on the low-temperature side. As a result, the low temperature embrittlement can be efficiently suppressed, and the shell material 12 on the opposite side can be made of a relatively low-cost material or a small amount of material, thereby improving reliability at low cost.

Further, since the aluminum evaporated film located on the outer wall side has a higher heat insulating performance than the aluminum foil, entry of heat from the outside air can be suppressed, and the inside of the tank can be maintained at a lower temperature.

(Third Embodiment)

Next, a third embodiment of the present invention will be described.

8 is a cross-sectional view showing a heat insulating structure of a heat insulating container in a third embodiment of the present invention.

The heat insulating structure of the present embodiment is constituted by the heat insulating panels 21 such as foamed styrol, in the first heat insulating box 5 and the powder heat insulating material 7 of the second heat insulating box 8 in the first embodiment.

The heat insulating panel 21 is formed of foamed styrene in the present embodiment, but may be formed of a polyurethane foam, a phenol foam, and a heat insulating material selected from glass wool and pearlite loaded in a heat insulating frame (not shown).

The gap between the heat insulating panels 21 and between the vacuum heat insulating materials 9 is filled with a filling insulating material 22 for ensuring the heat insulating property. The filling heat insulating material 22 is made of a material which is flexible and is rich in elasticity and which is close to the coefficient of linear expansion of microglass wool, soft urethane and container inner tank 3 whose diameter is less than 1 탆, for example, a phenol foam containing a reinforcing material, Polyurethane foam and the like are used.

The vacuum insulator 9 is arranged so as to cover the entire surface of the first heat insulating layer made of the heat insulating panel 21 with its outer periphery facing each other. Further, in this embodiment, the abutting portion of the vacuum heat insulating material 9 is set to be displaced from the abutting portion of the heat insulating panel 21 constituting the first heat insulating layer. Further, the sealing pin 17 formed on the outer periphery of the vacuum heat insulating material 9 is arranged to be cut into the low temperature side, that is, the side of the heat insulating panel 21.

Also in the heat insulating structure of the present embodiment, the vacuum heat insulating material 9 is adhered and fixed to the container outer tank 2 side, and the same operational effects as in the case of the first embodiment can be obtained.

In the case of the present embodiment, the heat insulating layer for inserting the container inner tank 3 and the vacuum heat insulating material 9 is used as the heat insulating panel 21 on the container inner tank 3 side and the heat insulating panel 21, respectively. The intermediate tank 4 is positioned between the heat insulating panel 21 on the container inner tank 3 side and the heat insulating panel 21 on the container outer tank 2 side and the heat insulating panel 21 on the container inner tank 3 side, And the thermal continuity of the heat insulating panel 21 on the container outer tank 2 side (the heat insulating panel 21 on the container inner tank 3 side and the heat insulating panel 21 on the container outer tank 2 side) The continuity in the case of continuity) is cut off. Thereby, it is possible to reduce the leakage amount at a very low temperature, and it is possible to more effectively suppress the low temperature embrittling of the outer cover material 12 of the vacuum insulating material 9.

Further, in the heat insulating structure of the present embodiment, the heat conductivity? Of the vacuum heat insulating material 9 is about 15 times lower than that of the heat insulating panel 21 made of foamed styrol, as described above. Therefore, the heat insulating performance by the vacuum heat insulating material 9 is remarkably improved as compared with the constitution comprising only the heat insulating panel 21.

Further, the vacuum insulation panel 9 cuts off the outside heat by making good use of its high heat-insulating performance, and significantly lowers the atmospheric temperature inside the vacuum insulation panel 9, that is, have. As a result, the heat insulating panel 21 of a plurality of layers has a relatively improved adiabatic effect and can exhibit a high adiabatic effect of the vacuum insulator 9 itself, so that the adiabatic performance thereof can be made extremely high .

In the present embodiment, the vacuum heat insulating material 9 is abutted at a position deviated from the panel abutting portion of the heat insulating panel 21, and is configured to cover substantially the entire outside of the heat insulating panel 21. Thereby, it is possible to prevent the low heat of the LNG from moving to the outside air through the abutting portion of the vacuum insulator 9, through the gap portion of the abutted portion of the heat insulating panel 21. [

Further, the sealing pin 17 of the vacuum heat insulating material 9 is configured to be inserted into the heat insulating panel 21 side. This makes it possible to suppress thermal leakage caused by the sealing pin 17 of the vacuum insulator 9. Therefore, it is possible to efficiently exert the heat insulating effect that fully takes advantage of the heat insulating effect of the vacuum heat insulating material 9 and the effect of reducing the atmospheric temperature of the heat insulating panel 21 mounting portion. Therefore, the heat insulating effect using the vacuum heat insulating material 9 can be sufficiently exhibited, and the heat insulating property can be remarkably improved.

Further, the micro-glass wool of the heat insulating material 22 filled in the abutted portion of the vacuum heat insulating materials 9 is flexible and rich in stretchability. Therefore, even if the vacuum insulator 9 expands and contracts according to the outside temperature, the charge insulator 22 expands and contracts accordingly. As a result, it is possible to prevent cracking of the sheath material 12 and breakage of the tearing caused by restraining the expansion and contraction of the vacuum heat insulating material 9, thereby securing a high heat insulating performance over a long period of time.

In the configuration of the present embodiment, the vacuum insulators 9 are fixed to each other by the filling insulator 22. Therefore, cracks and the like are likely to occur due to the stress deformation caused by the temperature difference between the upper and lower surfaces. Therefore, a structure in which the thermal stress dispersion layer 18 is provided between the vacuum insulation panel 9 and the heat insulating panel 21 to disperse thermal stress is particularly effective.

In addition, the intermediate tank 4 and the in-vessel tank 3 described in each embodiment are formed by a membrane or an inlet. Since these members are resistant to heat shrinkage, the container inner tank 3 and the intermediate tank 4 are subjected to heat shrinkage or overload due to a change in the use environment and the like, and the low temperature material in the container inner tank 3, Can be prevented from leaking out of the container inner tank (3). Therefore, the evaporated gas such as leaked liquefied natural gas does not diffuse to the first heat insulating layer and the second heat insulating layer to deteriorate the heat insulating performance, and a highly reliable heat insulating container can be realized.

(Fourth Embodiment)

Next, a fourth embodiment of the present invention will be described.

In the fourth embodiment, abrupt deformation of the vacuum insulator 9 can be suppressed and prevented more reliably when the residual gas expands inside the envelope 12 of the vacuum insulator 9.

In this embodiment, as shown in Figs. 9A and 9B, when the residual gas expands inside the envelope material 12 of the vacuum insulator 9, when the residual gas becomes a predetermined pressure or more, And the safety of the heat insulating container 1 is prevented by abruptly deforming the vacuum insulating material 9, thereby improving safety.

The constitution and effects of parts other than the explosion-proof structure body A are the same as those of the first to third embodiments, and the same parts as in the first to third embodiments are denoted by the same reference numerals, Omit and explain only the different parts.

The explosion-proof structure A used in the present embodiment is not limited to a specific structure, but typically, for example,

Configuration Example 1: Configuration in which the shell material 12 allows the residual gas to escape to the outside to relieve the expansion, and

Configuration Example 2: The adsorbent 16 enclosed in the casing material 12 together with the core material 11 is a chemisorption type chemically adsorbing the residual gas or non-heat-resistant which does not generate heat by adsorption of the residual gas, Or a chemically adsorbed and non-exothermic composition.

9A and 9B, an example of the explosion-proof structural body A of the structural example 1 will be described.

9A and 9B are diagrams showing an example of the configuration of the explosion-proof structure A in the fourth embodiment of the present invention.

As an example of the explosion-proof structure (A) of the configuration example 1, a check valve 24 and a strength reduction part 26 as shown in Figs. 9A and 9B, respectively, are exemplified.

Fig. 9A shows an example of the explosion-proof structure A constituted by the check valve 24. The check valve 24 has a configuration in the form of a cap for closing the valve hole 25 provided in a part of the shell material 12. The valve hole 25 is provided so as to pass through the inside and outside of the shell material 12, and the cap-shaped check valve 24 is made of an elastic material such as rubber.

Normally, since the valve hole 25 is closed by the check valve 24, it is substantially prevented that the outside air enters the inside of the shell material 12. Even if the outer shell 12 shrinks due to the ambient temperature change and accordingly the inner diameter of the valve hole 25 changes, the check valve 24 is made of an elastic material, . If the residual gas expands inside the shell member 12, the check valve 24 is easily disengaged from the valve hole 25 in accordance with the rise of the internal pressure, and the residual gas escapes to the outside.

Fig. 9B shows an example of the explosion-proof structure A constructed by providing the strength-lowering portion 26. Fig. The strength-decreasing portion 26 is formed by a portion 26a where a part of the welding area is made small at the welding portion between the sealing pins 17.

In the example of the strength reducing portion 26, the inner side (on the core 11 side) of the welding portion 26a of the sealing pin 17 is not welded. Therefore, if the residual gas is expanded inside the shell material 12, it is possible to prevent the increase of the internal pressure due to the rise of the internal pressure The pressure is likely to concentrate on the depressed portion 26. Then, the portion 26a where the welded area of the thermal welding layer 15 is made small is peeled off, and the residual gas escapes to the outside.

Further, the strength-lowered portion 26 is not limited to the structure for partially reducing the welded area shown in Fig. 9B, and the welded strength may be partially lowered even if the welded area is the same. For example, when the sealing pin 17 is heat-welded, the heat applied to only a part of the sealing pin 17 may be made small to weaken the degree of fusion of the welded portion. Alternatively, the strength-lowering portion 26 may be provided in a portion other than the welded portion of the sealing pin 17. For example, a portion in which the lamination strength is partially lowered may be formed between the thermal welding layer 15 and the gas barrier layer 14 constituting the shell material 12 to form the strength lowering portion 26.

Further, the portion of the material of the thermal welding layer 15 may be made of a material having a low welding strength in comparison with other portions, so that the strength-lowering portion 26 may be formed. For example, as described above, low-density polyethylene can be preferably used as the thermal welding layer 15, but it is possible to use a high-density polyethylene, an ethylene-vinyl alcohol copolymer, or an amorphous polyethylene Terephthalate or the like may be used. Since these polymer materials have a lower welding strength than that of low density polyethylene, they can be suitably used for forming the strength-lowering portions 26. [

As a method for forming the strength-lowering portion 26, there is a configuration in which the thickness of the welded portion of the thermal welding layer 15 is partially reduced, a structure in which the bonding strength of a portion of the welded portion of the heat- A configuration in which a small adhesive is interposed and a configuration in which the thermal welding layer 15 is partly peeled off and the gas barrier layers 14 are thermally welded directly to each other in a region where the sealing pin 17 of the shell material 12 becomes Can be adopted.

If an accident or the like occurs, the vacuum insulator 9 may be exposed to a harsh environment. However, in the case of the present embodiment, when the vacuum insulator 9 is exposed to a harsh environment and the internal residual gas expands or the like, the check valve 24 is disengaged from the valve hole 25, The excessive expansion pressure is dissipated to the outside, so that deformation of the vacuum insulator 9 can be effectively avoided. Therefore, the explosion resistance of the vacuum insulator 9 can be improved, and the safety of the heat insulator 1 can be enhanced.

9A and 9B showing the construction of the present embodiment, the thermal stress dispersion layer 18 provided in the vacuum insulator 9 is not shown, but the explosion-proof structure A is highlighted.

On the other hand, as the explosion-proof structure (A) of the second structural example, an adsorbent composed of the ZSM-5 type zeolite already described can be exemplified. The ZSM-5 type zeolite constituting the adsorbent is a gas adsorbent having a chemisorption action. Therefore, even when various environmental factors such as a temperature rise occur, it is substantially prevented that the once adsorbed gas is released again. Therefore, when the combustible fuel or the like is handled, even if the adsorbent 16 adsorbs the combustible gas under any influence, the gas will not be re-released owing to the influence of the subsequent temperature rise or the like. As a result, the explosion resistance of the vacuum insulator 9 can be further improved.

Further, since the ZSM-5 type zeolite is a non-combustible gas adsorbent, the adsorbent 16 in the present embodiment is composed substantially of a non-combustible material. Therefore, the core member 11 is also included, and the explosion resistance can be further improved without using a flammable material in the inside of the vacuum insulator 9.

As described above, when the adsorbent 16 is a chemisorption type, compared with the physically adsorption type, the adsorbed residual gas does not readily escape, so that the degree of vacuum inside the vacuum insulator 9 can be satisfactorily maintained. In addition, since the residual gas does not escape, it is possible to effectively prevent the residual gas from expanding inside the sheath member 12 and deforming the vacuum insulator 9. Therefore, the explosion resistance and the stability of the vacuum insulator 9 can be improved.

In addition, if the adsorbent 16 is a non-heat-generating material, a noncombustible material, or both, it is possible to prevent the adsorbent 16 from being heated or burned Can be avoided. Therefore, the explosion resistance and the stability of the vacuum insulator 9 can be further improved.

INDUSTRIAL APPLICABILITY As described above, the heat insulating container 1 according to the embodiment of the present invention can achieve high heat insulating performance over a long period of time while realizing cost reduction. However, it goes without saying that the configuration can be variously changed within the scope of achieving the object of the present invention.

For example, the heat stress dispersive layer 18 is provided on both sides of the vacuum heat insulator 9, but it may be provided at least on one side serving as an adhering face of a heat insulating box or the like. In this case, the strength of both the upper and lower surfaces of the vacuum insulator 9 is improved, and the effect of preventing the quality defect from being reduced can not be expected. However, it is sufficient to achieve the purpose of preventing cracks or the like against the heat shrinkage stress of the vacuum insulator 9 Do.

Although glass cloth is exemplified as the thermal stress dispersion layer 18, any material may be used as long as it can disperse the tensile shrinkage force due to heat shrinkage of the heat insulating box or the like. For example, in addition to glass fibers, those selected from carbon fibers, alumina fibers, silicon carbide fibers, aramid fibers, polyamide fibers and polyimide fibers having a small linear expansion coefficient and relatively high strength can be used.

Further, the thermal stress dispersion layer 18 is laminated on the sheath 12 of the vacuum heat insulator 9 to form the outermost layer of the sheath material 12, It may be bonded and integrated to both the vacuum insulation panel 9 and the second heat insulating box 8 by an adhesive.

Although the heat insulating container 1 is used as a tank for an LNG transporting line or the like in the embodiment, the present invention is not limited to this example, and the heat insulating container such as a LNG tank installed on the land, Or a low-temperature storage container to be used. The material to be preserved may be any material as long as it is not LNG but liquid hydrogen, such as liquid hydrogen, which is lower than the normal temperature by 100 ° C or more.

As described above, the heat-insulating container of the embodiment of the present invention is a heat-insulating container for holding a substance lower than the normal temperature by 100 占 폚 or more. The container is provided with the container inner tank 3, the container outer tank 2, And heat insulating layers 7 and 9 provided inside the heat insulating boxes 5 and 8. The heat insulating layers 7 and 9 are provided between the heat insulating boxes 2 and 5, The heat insulating layer has a panel-shaped vacuum insulating material 9 having a core material 11 and a shell material 12 for vacuum-sealing the core material 11 and a heat insulating material 7 made of a material different from that of the vacuum insulating material 9 . The vacuum insulation material has a thermal stress distribution layer 18 and is fixed to the heat insulating box.

As a result, the panel-shaped vacuum heat insulator can be used at low cost to secure the heat insulating property, and even if the thermal insulator in the heat insulating box is reduced and the clearance gap is formed, the vacuum heat insulator does not vibrate in the heat insulating box, The deterioration of the heat insulating property due to the damage of the sheath material can be prevented. Therefore, the deterioration of the heat insulating performance due to the damage of the outer surface of the vacuum insulating material can be prevented, and the high heat insulating property can be ensured at low cost over a long period of time.

The heat insulating material may be disposed on the container inner side of the heat insulating box and the vacuum heat insulating material may be disposed on the outer side of the container outside the heat insulating material of the heat insulating box.

According to such a configuration, the cryogenic temperature leaking from the cryogenic material to the vacuum insulating material is reduced by the heat insulating action by the heat insulating material, and the low temperature curing of the covering material can be suppressed. Therefore, the deterioration of the heat insulating performance due to the damaging of the casing material due to the low temperature embrittlement of the vacuum insulating material can be suppressed, and the high heat insulating property can be ensured over a longer period of time.

The vacuum heat insulating material may be integrally bonded and fixed to the inner surface of the heat insulating box via the thermal stress dispersion layer.

According to such a configuration, the thermal expansion coefficient of the heat insulating box and the sheath material of the vacuum insulating material is different, so that there is a difference in heat shrinkage between the heat insulating box and the sheathing material of the vacuum insulating material, and heat shrinkage force of the primary heat insulating layer is applied to the sheathing material of the vacuum insulating material Also, this heat contracting force is dispersed by the thermal stress dispersion layer. Further, the jacket material of the vacuum insulation material is suppressed from being cracked due to the difference in heat shrinkage. Thus, even when the vacuum insulating material is fixed to the heat insulating box, the inherent high heat insulating performance can be maintained as it is, and the heat insulating performance of the heat insulating container can be satisfactorily guaranteed over a long period of time.

The thermal stress dispersion layer may be composed of glass cloth.

According to such a constitution, the heat insulation performance of the glass cloth is also added, so that heat shrinkage cracking of the sheath material can be prevented, heat insulating property of the sheath material itself can be improved, and low temperature embrittlement of the sheath material itself can be suppressed. Therefore, reliability can be enhanced, and furthermore, high heat insulation can be ensured over a long period of time.

The vacuum thermal insulator may have a structure in which the thermal stress dispersion layer is integrally laminated on at least a surface of the sheathing material which is in contact with the inner surface of the heat insulating box.

According to such a configuration, it is possible to suppress the amount of use of the glass cloth, which is a factor of cost increase, by making only one surface of the inner surface of the heat insulating box. Therefore, the insulation performance can be satisfactorily guaranteed over a long period of time while suppressing an increase in cost.

The vacuum insulator may be configured such that the heat stress distribution layer is integrally laminated on both the upper and lower surfaces of the sheathing member so that the outermost layer of the sheathing member is formed.

According to such a constitution, since the outermost layers of the upper and lower surfaces of the vacuum heat insulator are heat stress dispersive layers having high strength, it is possible to prevent cracks from being generated or broken in the casing material by handling during production. Therefore, it is possible to suppress the generation rate of defective products in the vacuum insulating material, and to suppress the increase in cost, and to secure the heat insulating performance of the heat insulating container over a long period of time.

Further, an inorganic fiber may be used as the core material of the vacuum insulator.

According to this constitution, even if moisture remains in the jacket material of the vacuum thermal insulating material, it is possible to suppress the deformation of the vacuum thermal insulating material itself due to the expansion of the core material by the moisture. For example, when maintenance such as hot water washing is performed periodically, such as a heat insulating container for LNG carriers, even if some moisture remains in the sheath material, the vacuum heat insulating material is prevented from being expanded and deformed, It is possible to prevent the occurrence of cracks in the sheathing member. Therefore, it is possible to more reliably realize the adiabatic performance guarantee.

Further, the vacuum insulator may have an explosion-proof structure.

According to this structure, even if some moisture or air remains in the vacuum insulating material and the expansion occurs due to the moisture or air, when the expansion pressure becomes a predetermined value or more, the expansion pressure is released from the explosion- Can be discharged. Therefore, it is possible to prevent the explosion from continuing to expand as it is and to secure safety.

The heat insulating box has a first heat insulating box 5 having a heat insulating material 7 and a heat insulating material 7 disposed on the container inner side and a vacuum heat insulating material 9 on the outer side of the container outside the heat insulating material 7 And a second heat insulating box (8) disposed therein. The first adiabatic box may be disposed on the container inner tank side, and the second adiabatic box may be arranged so that the vacuum thermal insulator is positioned on the container outer tub side.

According to this configuration, the cryogenic temperature leaking from the material stored in the in-vessel tank to the vacuum insulating material is reduced by the heat insulating action of the heat insulating material of the first adiabatic box and the double heat insulating material of the second adiabatic box, Can be suppressed more strongly. As a result, the vacuum insulator can more reliably prevent deterioration of the heat insulating performance by, for example, cracking of the casing material. Therefore, it is possible to ensure high thermal insulation over a longer period of time.

The heat insulating box disposed on the container outer tub side has a box frame body with one side opened, and a partition member which is provided in the box frame and which divides the inside of the heat insulating box. The vacuum insulator may be unitized by a vacuum insulator attached to the bottom of the compartment partitioned by the partition, a heat insulating material disposed on the opening side of the vacuum insulator, and a closing plate closing the opening side of the box frame.

According to this configuration, it is also possible to easily load the heat insulating material and the vacuum heat insulating material between the in-vessel tank and the container outer tank only by loading the heat insulating box. Therefore, the transportability is improved and the productivity of the tank is improved, whereby the low temperature embrittlement of the vacuum insulator can be prevented with a simple structure, and the high heat insulating property can be ensured over a long period of time.

Further, the heat insulating material may be constituted by a powder thermal insulating material or a heat insulating panel.

According to such a configuration, for example, pearlite, a heat insulating panel such as foamed styrene or foamed urethane, and a panel-shaped vacuum insulating material are distributed as general-purpose parts, so that they can be obtained at low cost. In the case of the heat insulating panel, since it is in the form of a panel like the vacuum insulating material, it can be easily installed only by laying it. In addition, when powder insulator is not used, it is not necessary to provide a facility for preventing the powder from rising, and the low temperature embrittlement of the vacuum insulator can be prevented with a simple structure, and high heat insulation can be ensured over a long period of time.

The vacuum insulator may have a sealing pin of a shell material, and the sealing pin may be formed by being inserted into the heat insulator side.

According to this configuration, it is also possible to prevent the sealing pin, which is peculiar to the vacuum insulating material in the form of a panel, from coming into contact with the container outer tank and being thermally moved through the outer cover material such as a laminate film. Therefore, high heat insulating performance can be maintained.

Further, the heat insulating structure of the embodiment of the present invention is a heat insulating structure having a container outer tank, a first heat insulating box and a second heat insulating box. The first heat insulating box is unitized by a first box frame, a first heat insulator provided in the first box frame, and a first closing plate for closing the opening side of the first box frame. The second heat insulating box comprises a second box frame, a partition provided in the second box frame for partitioning the interior of the second adiabatic box, a vacuum insulator provided on the bottom of the partition partitioned by the partition, A second heat insulating material disposed on the opening side of the vacuum insulating material, and a second closing plate closing the opening side of the second box frame. The second adiabatic box is disposed on the container outer tub side with respect to the first adiabatic box, and the vacuum insulator has the heat stress distribution layer and is fixed to the second occlusion plate.

As a result, the panel-shaped vacuum insulation material can be used at low cost to secure the heat insulation property, and even if the thermal insulation material in the heat insulation box is reduced and the clearance gap is formed, the vacuum insulation material does not vibrate in the heat insulation box, The deterioration of the heat insulating property due to the damage of the sheath material can be prevented. Therefore, the deterioration of the heat insulating performance due to the damage of the outer surface of the vacuum insulating material can be prevented, and the high heat insulating property can be ensured at low cost over a long period of time.

Industrial Applicability As described above, the present invention can be applied to a wide range of insulation containers for storing and transporting cryogenic materials starting from LNG, because they can provide low insulation performance at low cost over a long period of time.

1: Insulated container 2: Container trough
3: vessel inner tank 4: middle tank
5: first insulation box 6: box frame
7: powder insulation (first insulation layer) 8: second insulation box
9: vacuum insulator (second insulating layer) 10:
11: core material 12: sheath material
13a: first protective layer 13b: second protective layer
14: gas barrier layer 15: thermal welding layer
16: adsorbent 17: sealing pin
18: thermal stress distribution layer 21:
22: charge insulation 24: check valve
25: valve hole 26: strength lowered portion
A: Explosion-

Claims (13)

In a heat insulating container holding a substance lower than the normal temperature by 100 占 폚 or more,
The vessel inner tank,
The container overtaking,
A heat insulating box provided between the inner tank and the outer tank,
And a heat insulating layer provided inside the heat insulating box,
Wherein the heat insulating layer has a panel-shaped vacuum insulating material having a core material and a shell material for vacuum-sealing the core material, and a heat insulating material made of a material different from that of the vacuum insulating material,
Wherein the vacuum insulation material has a thermal stress distribution layer, and the vacuum insulation material
Insulation container. The method according to claim 1,
Wherein the heat insulating material is disposed on the container inner side of the heat insulating box,
The vacuum insulator is disposed on the outer side of the container outer side of the heat insulating material of the heat insulating box
Insulation container. 3. The method according to claim 1 or 2,
The vacuum insulation material is integrally adhered and fixed to the inner surface of the heat insulating box through the thermal stress dispersion layer
Insulation container. The method of claim 3,
The thermal stress dispersion layer is composed of glass cloth
Insulation container. The method according to claim 3 or 4,
Wherein the thermal insulation material is formed by laminating the thermal stress dispersion layer integrally on the surface of the sheathing material which is in contact with at least the inner surface of the heat insulating box
Insulation container. 6. The method according to any one of claims 3 to 5,
The vacuum thermal insulator is formed by laminating the thermal stress dispersion layer integrally on both upper and lower surfaces of the envelope material to form an outermost layer of the envelope material
Insulation container. 7. The method according to any one of claims 1 to 6,
Wherein inorganic fibers are used as the core material of the vacuum insulator
Insulation container. 8. The method according to any one of claims 1 to 7,
The vacuum insulator has a structure having an explosion-proof structure
Insulation container. 9. The method according to any one of claims 1 to 8,
The heat insulating box includes:
A first heat insulating box having the heat insulating material,
And a second heat insulating box in which the heat insulating material is disposed on the container inner side and the vacuum heat insulating material is disposed on the outer side of the container outer side of the heat insulating material,
The first adiabatic box is disposed on the container inner side, and the second adiabatic box is disposed so that the vacuum adiabatic material is positioned on the container outer tub side
Insulation container. 9. The method according to any one of claims 1 to 8,
And the heat insulating box disposed on the container outer tub side,
A box frame body having one side open,
And a partition provided in the box frame for partitioning the inside of the heat insulating box,
The vacuum insulator disposed on the bottom of the compartment partitioned by the partition, the heat insulator disposed on the opening side of the vacuum insulator, and the closing plate closing the opening side of the box frame, The
Insulation container. 11. The method according to any one of claims 1 to 10,
The heat insulating material is composed of a powder insulating material or an insulating panel
Insulation container. 12. The method according to any one of claims 1 to 11,
Wherein the vacuum insulator has a sealing pin of the envelope material,
The sealing pin is inserted into the heat insulating material
Insulation container. 1. A heat insulating structure comprising a container outer tank, a first heat insulating box and a second heat insulating box,
The first heat insulating box is unitized by a first box frame body, a first heat insulating material provided in the first box frame body, and a first closing plate for closing an opening side of the first box frame body,
The second adiabatic box includes a second box frame, a partition provided in the second box frame for partitioning the inside of the second adiabatic box, and a partition wall provided on the bottom of the partition partitioned by the partition A second heat insulating material disposed on an opening side of the vacuum insulating material, and a second closing plate closing the opening side of the second box frame,
The second heat insulating box is disposed closer to the container outer tank than the first heat insulating box,
Wherein the vacuum insulator has a thermal stress dispersion layer,
Insulating structure.

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