JP6620315B2 - Insulated container - Google Patents

Description

  The present invention relates to a heat insulating container such as a low temperature tank for storing an ultra-low temperature material such as LNG (liquefied natural gas).

  In general, for low-temperature tanks that store Liquidated Natural Gas (LNG) and the like, efforts have been made to enhance heat insulation using a vacuum heat insulating material in order to reduce evaporation loss during transportation and storage (for example, patent literature) 1).

  FIG. 10 is a diagram showing a heat insulation structure of a conventional low-temperature tank disclosed in Patent Document 1. As shown in FIG.

  As shown in FIG. 10, the heat insulation structure of the low-temperature tank includes a tank outer wall 101 and several thousand heat insulation panels 102 arranged outside the tank outer wall 101. The heat insulating panel 102 includes an inner layer panel 103 made of phenol foam, and an outer layer panel 104 in which a vacuum heat insulating material 104a (a glass wool used as a core material is vacuum packed with a multilayer laminate film) is wrapped with a rigid polyurethane foam 104b. I have. In addition, an additional heat insulation panel 105 disposed so as to cover the seam 106 between the heat insulation panels 102 is provided. As with the outer panel 104, the additional heat insulating panel 105 is configured by wrapping the periphery of the vacuum heat insulating material 105a with a hard polyurethane foam 105b.

  According to such a configuration, the heat flow from the inner wall side of the tank toward the outer wall is applied to the inner layer panel 103 and the rigid polyurethane foam 104b of the outer layer panel 104, and the vacuum heat insulating materials 104a and 105a arranged alternately are provided. It will be blocked. For this reason, the heat insulation performance of the low temperature tank can be remarkably improved.

  However, in such a conventional configuration, although the heat insulation performance is certainly improved, it can be used for a long time due to the difference in the linear expansion coefficient between the vacuum heat insulating materials 104a and 105a and the rigid polyurethane foams 104b and 105b. In the meantime, there is a concern that the multi-layer laminate film as the covering material of the vacuum heat insulating materials 104a and 105a is subjected to heat shrinkage stress accompanying heat shrinkage of the hard polyurethane foams 104b and 105b, and cracks are generated. Therefore, it is difficult to ensure the heat insulating performance of the vacuum heat insulating materials 104a and 105a over a long period of time.

  That is, in the configuration described in Patent Document 1, for example, the vacuum heat insulating material 104a of the outer panel 104 is integrally formed with the rigid polyurethane foam 104b. For this reason, the multilayer laminate film of the vacuum heat insulating material 104a is stretched and stretched by the heat shrinkage of the rigid polyurethane foam 104b. The multilayer laminate film is cracked by the repeated stretching and stretching, and the heat insulation performance of the vacuum heat insulating material 104a may be lowered due to the crack.

  In addition, the outer cover material of the vacuum heat insulating material 104a is cooled to a very low temperature through conduction of the ultra low temperature of a substance such as LNG through the phenol foam and the seam 106 constituting the inner panel 103. As a result, the multilayer laminate film constituting the jacket material tends to become low temperature embrittled. For this reason, the crack by heat shrink becomes easy to generate | occur | produce as a usage time becomes long, and becomes a big subject.

JP 2010-249174 A

  The present invention has been made in view of the above points, and prevents deterioration of the heat insulation performance due to the occurrence of cracks due to the difference in thermal shrinkage of the jacket material of the vacuum heat insulating material, ensuring high heat insulation performance over a long period of time. An insulated container that can be used is provided.

  The heat insulating container of the present invention is a heat insulating container that holds a substance having a temperature of 100 ° C. or lower than room temperature, and is disposed outside the container housing and the container housing, and is disposed at least on the container housing side. And a heat insulating layer. And a vacuum heat insulating material disposed on the outer side of the primary heat insulating layer and having a breathable core material and a jacket material for vacuum-sealing the core material, and between the vacuum heat insulating material and the primary heat insulating layer. And a thermal stress dispersion layer disposed on the surface.

  As a result, even if there is a difference in heat shrinkage between the primary heat insulating layer and the vacuum heat insulating material and the heat shrinking force of the primary heat insulating layer is applied to the jacket material of the vacuum heat insulating material, It is possible to suppress the occurrence of cracks or the like due to the difference in thermal shrinkage of the outer jacket material of the vacuum heat insulating material dispersed by the layers. Thereby, the vacuum heat insulating material can maintain the original high heat insulation performance as it is, and can ensure the heat insulation performance of a heat insulation container favorably over a long period of time.

  According to the present invention, it is possible to suppress a decrease in heat insulation performance due to heat shrinkage cracking of the jacket material of the vacuum heat insulating material, and thus it is possible to ensure high heat insulation performance over a long period of time.

FIG. 1 is a cross-sectional view of a heat insulating container according to the first embodiment of the present invention. FIG. 2 is an enlarged cross-sectional view showing the heat insulating structure of the heat insulating container according to the first embodiment of the present invention. FIG. 3 is a cross-sectional view of a vacuum heat insulating material used in the heat insulating structure of the heat insulating container according to the first embodiment of the present invention. FIG. 4 is a plan view of a vacuum heat insulating material used for the heat insulating structure of the heat insulating container according to the first embodiment of the present invention. FIG. 5 is an explanatory diagram showing a thermal simulation result of the heat insulating container according to the first embodiment of the present invention. FIG. 6 is a diagram showing an experimental example in the first embodiment of the present invention. FIG. 7 is a diagram showing a configuration of a heat insulating structure of a heat insulating container according to the fourth embodiment of the present invention. FIG. 8 is a diagram showing a configuration of a heat insulating structure of a heat insulating container according to the fifth embodiment of the present invention. FIG. 9A is a diagram showing an example of an explosion-proof structure A according to the sixth embodiment of the present invention. FIG. 9B is a diagram showing an example of an explosion-proof structure A in the sixth embodiment of the present invention. FIG. 10 is a diagram showing a heat insulation structure of a conventional low temperature tank.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, this invention is not limited by each embodiment.

(First embodiment)
1-5 has shown the heat insulation container 1 in the 1st Embodiment of this invention.

  FIG. 1 is a cross-sectional view of a heat insulating container 1 according to the first embodiment of the present invention, FIG. 2 is an enlarged cross-sectional view showing a heat insulating structure 2 of the heat insulating container 1, and FIG. FIG. 4 is a cross-sectional view of the vacuum heat insulating material 8 used for the heat insulating structure 2 of the container 1, FIG. 4 is a plan view of the vacuum heat insulating material 8, and FIG. 5 shows the heat insulating container 1 according to the first embodiment. It is explanatory drawing which shows the thermal simulation result.

  In the present embodiment, a heat insulating container 1 of a spherical independent tank type (moss type) used for an LNG tanker or the like is shown.

  In FIG. 1, a heat insulating container 1 holds a substance that is 100 ° C. lower than normal temperature, for example, liquefied natural gas (hereinafter referred to as LNG) at −162 ° C., and insulates the outer surface portion and the inner surface portion. A structure 2 is provided. The support 3 fixes the heat insulating container 1 to the hull 4 and is called a skirt. For example, the support 3 can have a thermal brake structure in which stainless steel having low thermal conductivity is inserted between an aluminum alloy and low-temperature steel to reduce intrusion heat. Further, the outer periphery of the heat insulating structure 2 of the heat insulating container 1 is covered with a cover 5.

  FIG. 2 shows an example of the configuration of the heat insulating structure 2 of the heat insulating container 1. The container housing 6 of the heat insulating container 1 is formed of stainless steel having a thickness of about 5 mm.

  The heat insulation structure 2 is comprised by the primary heat insulation layer 7 by the side of the container housing | casing 6 and the vacuum heat insulating material 8 arrange | positioned on the outer side.

  The primary heat insulation layer 7 is comprised by the 1st heat insulation layer 7a by the side of the container housing | casing 6, and the 2nd heat insulation layer 7b arrange | positioned on the outer side. The 1st heat insulation layer 7a and the 2nd heat insulation layer 7b are each comprised by affixing the thousands heat insulation panel 9 of a square shape.

  In the present embodiment, the heat insulation panel 9 is formed of expanded polystyrene (bead method expanded polystyrene (expanded polystyrene beads by Expandable Polystyrene Beads-EPS)) having a thickness of about 300 mm to 400 mm. It may be constituted by a heat insulating material such as glass wool or pearlite loaded in the container.

  The primary heat insulating layer 7 of the present embodiment is provided with a metal mesh 7c between the first heat insulating layer 7a and the second heat insulating layer 7b and the vacuum heat insulating material 8 in order to ensure strength. ing. The primary heat insulating layer 7 and the vacuum heat insulating material 8 are attached and fixed to the container housing 6 by bolts 10.

  Further, the vacuum heat insulating material 8 disposed on the outer side of the primary heat insulating layer 7 has a thermal conductivity λ of 0.002 W / (m · K) at 0 ° C., and the first heat insulating layer 7a and the second heat insulating layer 7 This is about 15 times lower than the polystyrene foam constituting the heat insulating layer 7b.

  As shown in FIG. 3, the vacuum heat insulating material 8 is configured in a panel shape by enclosing the core material 14 in an outer cover material 15 and sealing it under reduced pressure. The covering material 15 includes a first protective layer 16a made of a PET film having a thickness of 12 μm, a second protective layer 16b made of a nylon film having a thickness of 25 μm, a gas barrier layer 17 made of an aluminum foil having a thickness of 7 μm, and a thickness It is a laminate film in which a heat welding layer 18 made of a low-density polyethylene film having a thickness of 50 μm is laminated.

  The vacuum heat insulating material 8 depressurizes the core material 14 formed by firing glass fibers having an average fiber diameter of 4 μm and produced by centrifugation, and the adsorbent 20 made mainly of calcium oxide, and ends the ends. In FIG. 2, the heat-welded layers 18 are heat-bonded and sealed so as to face each other. And the sealing fin 13 in which the core material 14 does not exist in the inside and the jacket materials 15 are contacting is formed in the heat-welded part and the outer part.

  Furthermore, in the vacuum heat insulating material 8 of the present embodiment, the thermal stress dispersion layer 21 is laminated and integrated on the outer sides of the upper and lower surfaces of the first protective layer 16a constituting the outer cover material 15, respectively. That is, the outermost layer of the jacket material 15 is constituted by the thermal stress dispersion layer 21. The thermal stress dispersion layer 21 may be integrated with the first protective layer 16a by adhesion.

  The thermal stress dispersion layer 21 is formed of a material having a small coefficient of linear expansion and a small thermal shrinkage, and having a resistance to ultra-low temperatures and a high mechanical strength. For example, in the present embodiment, the thermal stress dispersion layer 21 is configured by a glass cloth having a thickness of about 150 μm.

  Further, as the gas adsorbent contained in the adsorbent 20 of the vacuum heat insulating material 8, an adsorbent made of ZSM-5 type zeolite in a powder form having a large surface area is used. In order to improve nitrogen adsorption characteristics at room temperature, among ZSM-5 type zeolite, more preferably, at least 50% or more of the copper sites of ZSM-5 type zeolite are monovalent copper sites. Yes, an adsorbent in which at least 50% or more of the copper monovalent sites are oxygen tricoordinate copper monovalent sites can be used.

  Thus, by using a gas adsorbent with an increased rate of oxygen tricoordinate copper monovalent sites, the amount of air adsorbed can be greatly improved.

  The gas adsorbent used in the present embodiment is ZSM-5 type zeolite, which is formed without using a combustible material. As a result, when a gas adsorbent is disposed inside a vacuum heat insulating material used in a tank of flammable gas such as LNG, the flammable gas has invaded into the vacuum heat insulating material 8 due to aging degradation or the like. Even if it is a case, there is no danger of ignition etc., and the safe vacuum heat insulating material 8 can be comprised.

  In the vacuum heat insulating material 8 of the present embodiment, the flame retardant structure is further improved. That is, by using inorganic fibers for the core material 14 of the vacuum heat insulating material 8, the flame retardancy is improved as compared with the heat insulating material using organic fibers, and as a result, the flame retardance of the heat insulating container 1 can be improved. it can. Moreover, since inorganic fiber is used, there is little volume expansion by the humidity in gas, and as a result, the shape retention property of the heat insulation container 1 and the explosion-proof property mentioned later can also be improved.

  In addition, as shown in FIG. 4, the vacuum heat insulating material 8 is provided with a through portion 8 a through which the bolt 10 for attaching the primary heat insulating layer is inserted at a substantially central portion (including the central portion). The circumference | surroundings of 8a are comprised by the welding layer 15a in which the jacket materials 15 contact | adhered closely.

  In addition, this invention is not limited to the structure using such a volt | bolt 10. FIG. For example, the structure which was not having the penetration part 8a, but was filled with fillers, such as urethane, in the edge part which the vacuum heat insulating materials 8 have faced | matched. In such a configuration, since the vacuum heat insulating materials 8 are fixed to each other by the filler, cracks and the like are likely to occur due to stress strain due to a temperature difference between the upper and lower surfaces. Therefore, a configuration in which the thermal stress distribution layer 21 is provided between the vacuum heat insulating material 8 and the primary heat insulating layer 7 to disperse the thermal stress is particularly effective.

  The vacuum heat insulating material 8 configured as described above is affixed to the primary heat insulating layer 7 and fixed to the container housing 6.

  In the present embodiment, first, on the entire surface of the thermal stress dispersion layer 21 that constitutes the outermost layer of the jacket material 15 of the vacuum heat insulating material 8, the surface facing the primary heat insulating layer 7 (second heat insulating layer 7 b), An adhesive 22 made of hot melt or the like is applied, and the vacuum heat insulating material 8 is bonded and integrated to the outer surface of the heat insulating panel 9 constituting the primary heat insulating layer 7.

  Next, the heat insulating panel 9 in which the vacuum heat insulating material 8 is integrated in this way is fixed to the container housing 6 by a known method, and the vacuum heat insulating material 8 is attached. For example, as shown in FIG. 2, from the upper part of the vacuum heat insulating material 8, the bolt 10 penetrating through the penetrating portion 8 a and the heat insulating panel 9 is fastened to a nut 6 a fixed by welding or the like, and is attached to the container housing 6. Can be fixed. At this time, in the present embodiment, the vacuum heat insulating material 8 is further fixed to the heat insulating panel 9 so that the head flange 11 of the bolt 10 presses the welded layer 15a around the through portion 8a of the vacuum heat insulating material 8. Has been.

  Moreover, the filling heat insulating material 12 may be provided between the butting surfaces of the vacuum heat insulating material 8 and between the butting surfaces of the primary heat insulating layer 7 in order to ensure heat insulation. As this filling heat insulating material 12, for example, micro glass wool having a fiber diameter of less than 1 μm, which is flexible and highly stretchable, is used. The filling heat insulating material 12 may be made of soft urethane or a material close to the linear expansion coefficient of the container housing 6 such as phenol foam or polyurethane foam with a reinforcing material, as long as it is flexible and rich in elasticity. Good.

  Moreover, in this Embodiment, the butting part of the vacuum heat insulating material 8 and the butting part of the heat insulation panel 9 which comprises the primary heat insulation layer 7 are set so that it may mutually shift.

  Further, the sealing fin 13 formed on the outer peripheral edge of the vacuum heat insulating material 8 is arranged to be folded on the low temperature side, that is, the primary heat insulating layer 7 side.

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

  The heat insulating container 1 is thermally insulated by a primary heat insulating layer 7 disposed outside the container housing 6 and a vacuum heat insulating material 8 disposed on the outer side of the primary heat insulating layer 7. LNG is kept at a low temperature.

  Here, in the heat insulation container 1, the whole surface of the vacuum heat insulating material 8 is bonded and integrated with the adhesive 22 to the outer surface of the primary heat insulating layer 7 (second heat insulating layer 7b). Therefore, when thermal contraction occurs in the primary heat insulating layer 7 (second heat insulating layer 7 b), the tensile expansion / contraction force due to this is applied to the jacket material 15 of the vacuum heat insulating material 8.

  The tensile expansion / contraction force due to the thermal contraction of the primary heat insulating layer 7 (second heat insulating layer 7b) applied to the outer cover material 15 of the vacuum heat insulating material 8 constitutes the outermost layer of the outer cover material 15 of the vacuum heat insulating material 8. Applied to the thermal stress dispersion layer 21.

  In this embodiment, the thermal stress dispersion layer 21 is made of glass cloth, has a small coefficient of linear expansion, little thermal shrinkage, and high resistance to ultra-low temperatures and high mechanical strength. Thereby, the thermal stress dispersion layer 21 disperses and absorbs the thermal contraction force with almost no thermal contraction against the thermal contraction of the primary thermal insulation layer 7 (second thermal insulation layer 7b), and the thermal contraction is almost not. Does not occur.

  As a result, it is possible to strongly suppress the occurrence of cracks in the gas barrier layer 17 made of an aluminum foil of the jacket material 15 laminated and integrated with the thermal stress dispersion layer 21. In particular, heat shrink cracks tend to occur at the corners. However, the thermal contraction stress that tends to concentrate on the corner is received and dispersed by the thermal stress dispersion layer 21, so that the corner is protected from the thermal contraction stress, and cracks due to the concentration of the thermal contraction stress are efficiently suppressed. be able to.

  Therefore, even if it has been used for a long time, it is possible to prevent the gas barrier layer 17 of the jacket material 15 from cracking, and to maintain the high heat insulating property of the vacuum heat insulating material 8 over a long period of time. Can ensure gender.

  In the present embodiment, a glass cloth is used as the thermal stress dispersion layer 21. Glass cloth has a small coefficient of linear expansion, low thermal shrinkage, and high resistance to ultra-low temperatures and high mechanical strength. Furthermore, the glass cloth has low heat conductivity and high heat insulation. Thereby, it can suppress that the vacuum heat insulating material 8 becomes low temperature embrittlement by the ultra low temperature from the substance preserve | saved in the container housing | casing 6. FIG. Therefore, the occurrence of cracks due to low temperature embrittlement of the jacket material 15 can be suppressed, and the heat insulating property of the heat insulating container 1 can be ensured for a long period of time.

  Further, in the present embodiment, the thermal stress distribution layer 21 that is the outermost layer of the vacuum jacket 15 is laminated and integrated on both the upper and lower surfaces of the jacket 15. Therefore, the outer covering material 15 of the vacuum heat insulating material 8 has high strength on the entire outer surface, and the outer covering material 15 can be prevented from being cracked or torn by handling during production. . Therefore, the defective product rate of the vacuum heat insulating material 8 that is likely to occur in the assembly process of the heat insulating structure 2 is suppressed, and the heat insulating performance of the heat insulating container 1 is improved over a long period of time while suppressing the cost increase. be able to.

  Moreover, in this Embodiment, in addition to the integration by the adhesive agent 22, the vacuum heat insulating material 8 is further made to insert the volt | bolt 10 in the penetration part 8a provided in the approximate center part, and the penetration part 8a. The periphery is mechanically fixed to the primary heat insulating layer 7. Thereby, even if the adhesion by the adhesive 22 is deteriorated due to deterioration over time, and the vacuum heat insulating material 8 is likely to fall due to its own weight, the fall can be prevented. Therefore, it is possible to realize a safe and reliable configuration in which the vacuum heat insulating material 8 is not peeled off.

  Further, the above-described mechanical fixing is performed by pressing the welding layer 15a around the through-hole 8a, in which the jacket materials 15 are in close contact, with the head flange 11 of the bolt 10. Accordingly, the vacuum heat insulating material 8 can be fixed without damaging the outer cover material 15 of the core material 14 portion of the vacuum heat insulating material 8, the heat insulating performance is deteriorated due to the damage of the outer cover material 15, and the outer cover material. It is possible to prevent the deterioration of 15 and to ensure the heat insulation performance over a long period of time.

  Furthermore, in this Embodiment, the primary heat insulation layer 7 provided in the container housing | casing 6 outer surface of the heat insulation container 1 is arrange | positioned by overlapping the 2nd heat insulation layer 7b in addition to the 1st heat insulation layer 7a. It is constituted by. Therefore, it is possible to greatly reduce conduction leakage of ultra-low temperature from the substance stored in the container housing 6 to the vacuum heat insulating material 8 by the first heat insulating layer 7a and the second heat insulating layer 7b. As a result, it is possible to effectively suppress the low-temperature embrittlement of the jacket material 15 of the vacuum heat insulating material 8. Thereby, the vacuum heat insulating material 8 can maintain the original high heat insulation performance, and can also ensure high heat insulation over a long period of time.

  By providing a primary heat insulating layer 7 that insulates between the container housing 6 and the vacuum heat insulating material 8 separately from the first heat insulating layer 7a and the second heat insulating layer 7b, between them, An air layer is formed. Accordingly, material continuity (the first heat insulating layer 7a and the second heat insulating layer 7b are integrated, and the material constituting the first heat insulating layer 7a and the second heat insulating layer 7b, for example, styrene foam). However, the leakage of ultra-low temperature can be reduced, and the outer cover material 15 of the vacuum heat insulating material 8 can be reduced. Low temperature embrittlement can be more effectively suppressed.

  Moreover, as already stated, the heat conductivity λ of the vacuum heat insulating material 8 in the heat insulating structure 2 of the present embodiment is such that the first heat insulating layer 7a and the second heat insulating layer 7b of the primary heat insulating layer 7 are the same. It is about 15 times lower than the thermal conductivity λ of the expanded polystyrene. Thereby, since the heat insulation by the vacuum heat insulating material 8 is added, the heat insulation performance can be greatly improved as compared with the structure composed only of the first heat insulation layer 7a and the second heat insulation layer 7b.

  Furthermore, the vacuum heat insulating material 8 fully utilizes the high heat insulating performance to block outside air heat, and greatly reduces the ambient temperature inside the vacuum heat insulating material 8, that is, the portion where the primary heat insulating layer 7 is provided. . Thereby, the primary heat insulation layer 7 can improve the heat insulation effect which itself has relatively, and the heat insulation performance is extremely high in combination with the high heat insulation effect of the vacuum heat insulating material 8 itself. can do.

  Moreover, the 1st heat insulation layer 7a and the 2nd heat insulation layer 7b of the primary heat insulation layer 7 are comprised only by the polystyrene foam. Thereby, the ultra-low temperature conduction from the substance such as LNG, that is, the ultra-low temperature leakage amount becomes substantially equal over the entire region. As a result, the temperature distribution of the surface in contact with the vacuum heat insulating material 8 of the primary heat insulating layer 7 (second heat insulating layer 7b) becomes substantially equal. Therefore, the vacuum heat insulating material 8 in contact with the primary heat insulating layer 7 (second heat insulating layer 7b) also includes substantially the same temperature distribution including the adjacent vacuum heat insulating material 8. Thereby, in the vacuum heat insulating material 8, since the thermal expansion / contraction variation of the jacket material 15 due to uneven temperature distribution can be suppressed and the crack due to the thermal expansion / contraction variation of the jacket material 15 itself can be prevented, high thermal insulation can be achieved for a longer period of time. Can ensure gender.

  In other words, since the vacuum heat insulating material 8 is disposed on the outer surface of the primary heat insulating layer 7, the distance from the substance such as LNG to the vacuum heat insulating material 8 is substantially the same over the entire region. Therefore, the ultra-low temperature conduction from the substance such as LNG to the vacuum heat insulating material 8, that is, the ultra-low temperature leakage amount is substantially equal over the entire region. Also from this point, the temperature distribution of the surface of the vacuum heat insulating material 8 in contact with the primary heat insulating layer 7 (second heat insulating layer 7b) becomes substantially equal. Therefore, temperature distribution unevenness of the jacket material 15 of the vacuum heat insulating material 8 can be suppressed, variation in the degree of expansion / contraction of the jacket material 15 can be suppressed, and the degree of crack generation can be greatly reduced.

  Further, in the present embodiment, since the outer side of the primary heat insulating layer 7 is covered with the vacuum heat insulating material 8, the surface temperature of the primary heat insulating layer 7 can be suppressed from varying depending on the environmental conditions, and is in contact with the primary heat insulating layer 7. Moreover, the crack of the jacket material 15 of the vacuum heat insulating material 8 can be further suppressed.

  Moreover, the filling heat insulating material 12 with which the butt | matching part of the vacuum heat insulating materials 8 was filled is comprised with the micro glass wool, and is flexible and rich in a stretching property. Thereby, even if slight expansion / contraction occurs in the vacuum heat insulating material 8 according to the temperature of the outside air, the filling heat insulating material 12 expands / contracts accordingly, so that the expansion / contraction of the vacuum heat insulating material 8 is restricted. Cracks and the like of the material 15 are prevented, and higher heat insulation performance can be ensured over a long period of time.

  The vacuum heat insulating material 8 is formed by vacuum-sealing a breathable core material 14 with a jacket material 15 made of a laminate film, and the sealing fin 13 is formed as a primary heat insulating layer 7 (second heat insulating layer). 7b) is folded and configured. Thereby, the heat leak which arises through the sealing fin 13 of the vacuum heat insulating material 8 can be suppressed. Therefore, it is possible to efficiently exhibit the heat insulating effect that fully utilizes the heat insulating effect of the vacuum heat insulating material 8 and the effect of lowering the ambient temperature of the portion where the primary heat insulating layer 7 is installed. Therefore, the heat insulation effect using the vacuum heat insulating material 8 can be fully exhibited, and the heat insulation can be dramatically improved.

  FIG. 5 is an explanatory view showing a thermal simulation result in the first embodiment of the present invention, and a broken line indicates that the conventional heat insulation panel is arranged up to the position of the vacuum heat insulating material in the figure, and the low temperature by LNG Shows the characteristics of the conventional type in which heat is transferred to the outside air, and the alternate long and short dash line indicates the characteristics of the configuration of the present embodiment.

  As apparent from FIG. 5, in the configuration of the present embodiment, the outer surface temperature of the primary heat insulating layer 7 can be lowered from A to B by the heat insulating effect by the vacuum heat insulating material 8. That is, due to the vacuum heat insulating material 8, the ambient temperature of the installation portion of the primary heat insulating layer 7 is lowered from A to B. Moreover, since the thermal gradient angle in the primary heat insulation layer 7 is gentle, the movement of low heat in the primary heat insulation layer 7 itself is reduced, and the heat insulation effect by the primary heat insulation layer 7 due to the decrease in the ambient temperature is improved. I understand that.

  FIG. 6 is a diagram showing an experimental example in the first embodiment of the present invention.

  In FIG. 6, the comparative example 1 is the structure formed only by the heat insulation layer in which the vacuum heat insulating material is not arrange | positioned. Experimental Example 1 is a measurement of a change in the heat transmissivity in a configuration in which a vacuum heat insulating material is provided on the outer wall side with the same heat insulating layer thickness as that of the comparative example. Experimental Example 2 measures the thickness of the heat insulating layer when a vacuum heat insulating material is provided on the outer wall side and the thermal conductivity is the same as that of Comparative Example 1.

  As conditions for measuring these, the temperature in the tank was −160 ° C., and the outside air temperature was 25 ° C.

  Moreover, as the primary heat insulation layer 7, a polystyrene foam is used.

  In Experimental Example 1, the average heat transmissivity is measured in the same manner as in Comparative Example 1 in the thickness of the entire heat insulating layer. In this case, compared with the comparative example 1, the heat insulation performance is improved by 28%.

  In Experimental Example 2, when the same heat insulating performance as in Comparative Example 1 is to be obtained, the degree to which the entire heat insulating layer becomes thin is measured. In this case, it can be seen that the thickness can be reduced by 37% compared to Comparative Example 1.

  Thus, according to the structure of this Embodiment, the total thickness width of the primary heat insulation layer 7 which consists of the 1st heat insulation layer 7a and the 2nd heat insulation layer 7b can be made small significantly. For example, if the panel thickness of the vacuum heat insulating material 8 is 20 mm, the total thickness of the first heat insulating layer 7a and the second heat insulating layer 7b can be reduced by 170 mm, and the volume of the heat insulating container 1 is increased accordingly. be able to.

  For example, by using the configuration of the present embodiment as a heat insulating container (tank) such as an LNG tanker that uses LNG boil-off gas as fuel, the amount of LNG used can be suppressed. Therefore, economic efficiency is improved, and in the type of LNG tanker that reliquefies the LNG boil-off gas, energy loss for the reliquefaction can be reduced.

  In addition, by using inorganic fibers as the core material 14 of the vacuum heat insulating material 8, it is possible to make the heat insulating material flame-retardant with respect to similar burning to the heat insulating container 1 caused by a fire from the outside. Furthermore, even if moisture remains in the jacket material 15 of the vacuum heat insulating material 8, it is possible to prevent the core material 14 from expanding due to the moisture and deforming the vacuum heat insulating material 8 itself. Thereby, like the LNG insulation container etc., when maintenance such as hot water cleaning is performed periodically, the vacuum heat insulating material 8 is greatly expanded and deformed at the time of the hot water cleaning, and due to the large thermal expansion deformation of the vacuum heat insulating material 8 itself, It is possible to prevent the outer cover material 15 from being cracked, and to ensure the heat insulating property of the heat insulating container 1 more reliably.

  Moreover, since the glass fiber is baked and used as the core material 14, a dimensional change can be significantly suppressed compared with the case where it is not baked.

  For example, when the core material 14 formed by the centrifugal method is used without firing, the dimensional deformation becomes twice or more, and the thickness increases 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 at most 1.5 times or less, so the dimensional deformation can be prevented between the inner wall and the outer wall of the tank. It is possible to suppress harmful effects caused by waking up.

  In the present embodiment, the core material 14 is formed by the centrifugal method. However, for example, the core material 14 formed by a papermaking method that dehydrates the water-containing core material is used so as to spread paper. It is also possible.

  In the case of using the core material 14 formed by the papermaking method, the fiber is dispersed in advance by dissolving in water, and then dehydrated, so that there is little dimensional deformation when the pressure is reduced with respect to atmospheric pressure, and the thickness is reduced. To form. For this reason, even when the bag is broken due to a crack or the like, it is possible to suppress adverse effects caused by dimensional deformation.

  Moreover, according to this Embodiment, since the vacuum heat insulating material 8 is arrange | positioned in 1 row at the outermost wall side of the heat insulation container 1, 2 rows of heat insulation panels are arrange | positioned like the past, and the vacuum heat insulating material 8 is provided. As in the case of superposing most of them, a large amount of vacuum heat insulating material 8 is not required, and a large amount of material and cost required for this purpose can be reduced.

(Second Embodiment)
Next, a second embodiment of the present invention will be described.

  Although the structure of 2nd Embodiment is the same as that of the structure shown by FIGS. 1-4, the 1st heat insulation layer 7a and the 2nd heat insulation layer 7b which comprise the primary heat insulation layer 7 are mutually different materials. Even if they are the same foamed polystyrene, the foaming densities are different from each other, and the heat insulation performance of the second heat insulation layer 7b is equal to or higher than the heat insulation performance of the first heat insulation layer 7a. It differs in a certain point as composition.

  For example, the structure which forms the 1st heat insulation layer 7a with the expanded polystyrene by EPS similar to 1st Embodiment, and forms the 2nd heat insulation layer 7b with a urethane foam is mentioned.

  Thereby, the atmospheric temperature of the 1st heat insulation layer 7a installation part by the side of the container housing | casing 6 can be restrained low with the 2nd heat insulation layer 7b located in the outer side with high heat insulation performance. Therefore, the heat insulating effect of the first heat insulating layer 7a is improved, and accordingly, heat leakage to the vacuum heat insulating material 8 is suppressed, and low temperature embrittlement of the temperature of the outer cover material 15 is suppressed, thereby further improving the reliability. it can.

  Furthermore, the heat insulation performance of the second heat insulation layer 7b can be improved by providing the vacuum heat insulating material 8 having a heat insulation performance higher than that of the second heat insulation layer 7b on the outer wall side. It is also possible to improve the heat insulating performance of one heat insulating layer 7a.

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

  The configuration of the third embodiment is the same as the configuration shown in FIGS. 1 to 4, but of the first protective layer 16 a and the second protective layer 16 b of the outer cover material 15 of the vacuum heat insulating material 8. The structure in which the heat insulation layer 7b is in contact with the heat insulation layer 7b on the opposite side is more highly resistant to low temperature embrittlement than that in contact with the outside air.

  For example, the material on the side of the vacuum heat insulating material 8 that is in contact with the second heat insulating layer 7b is a material obtained by coating a laminated film inside the thermal stress dispersion layer 21 with an aluminum foil. The material on the opposite side, which is in contact with the outside air, is a material obtained by coating the laminate film inside the thermal stress dispersion layer 21 with aluminum vapor deposition.

  Alternatively, the laminated film inside the thermal stress dispersion layer 21 of the outer cover material 15 on the side in contact with the second heat insulating layer 7b of the vacuum heat insulating material 8 has a multiple structure. And the laminate film inside the thermal stress dispersion layer 21 of the jacket material 15 on the opposite side to the outside air is made into a single structure.

  Thereby, the jacket material 15 on the low temperature side of the vacuum heat insulating material 8 can further improve the low temperature embrittlement resistance, and can efficiently suppress the low temperature embrittlement. The outer covering material 15 on the opposite side can be made of a relatively inexpensive material or the same material with a small amount, and the reliability can be improved at a low cost.

  In addition, the aluminum vapor deposition film located on the outer wall side has higher heat insulation performance than aluminum foil, so it is possible to suppress the ingress of heat from the outside air, and to maintain the inside of the tank at a lower temperature. Become.

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

  FIG. 7 is a diagram showing the configuration of the heat insulating structure 102 of the heat insulating container 1 according to the fourth embodiment of the present invention.

  In the fourth embodiment, a tertiary heat insulating layer 23 is provided on the outer side of the vacuum heat insulating material 8 in the first to third embodiments. The tertiary heat insulating layer 23 may be formed of the same material as the first heat insulating layer 7a and the second heat insulating layer 7b of the primary heat insulating layer 7, or may be formed of a different material.

  According to the structure of 4th Embodiment, the heat insulation effect of the tertiary heat insulation layer 23 is added, the temperature of the outside air side of the vacuum heat insulating material 8 can be reduced, and the heat leak through the jacket material 15 is further reduced. The heat insulation performance can be further increased by reducing the temperature.

(Fifth embodiment)
Next, a fifth embodiment of the present invention will be described.

  FIG. 8 is a diagram showing a configuration of the heat insulating structure 202 of the heat insulating container 1 according to the fifth embodiment of the present invention.

  In the present embodiment, the vacuum heat insulating materials 8 in the first to fourth embodiments are arranged in a double manner, and the outer peripheral edges are arranged so as to overlap each other.

  By adopting such a configuration, the gap generated at the abutting portion between the vacuum heat insulating materials 8 is eliminated, and the heat insulating loss generated at this portion is greatly reduced. At the same time, the vacuum heat insulating material 8 and the container housing 6 The sealing degree between can be increased. Therefore, the effect of lowering the ambient temperature of the portion where the primary heat insulating layer 7 (the first heat insulating layer 7a and the second heat insulating layer 7b) on the container housing 6 side can be further improved, The heat insulating property can be further enhanced.

  In addition, in this Embodiment, although the vacuum heat insulating material 8 shall be provided double, for example, by comprising the edge part shape of the outer periphery of the vacuum heat insulating material 8 in steps, of the adjacent vacuum heat insulating material 8 Similar to the butt portion shown in FIG. 8, the butt portion can have different shapes at the outer peripheral edge. Thus, even if it is the single vacuum heat insulating material 8, it becomes possible to suppress the heat transfer from a butt | matching part.

(Sixth embodiment)
Next, a sixth embodiment of the present invention will be described.

  In the sixth embodiment, when the residual gas expands inside the jacket 15 of the vacuum heat insulating material 8, it is possible to more reliably suppress and prevent the sudden deformation of the vacuum heat insulating material 8. Like that. That is, in this embodiment, as shown in FIGS. 9A and 9B, when the residual gas expands inside the jacket material 15, the residual gas is released to the outside when the residual gas exceeds a predetermined pressure. An explosion-proof structure A is provided to increase safety.

  The configuration and effects of the parts other than the explosion-proof structure A are the same as those in the first to fifth embodiments, and are the same as the configurations in the first to fifth embodiments. The same reference numerals are given to the parts, description thereof is omitted, and only different parts are described.

The explosion-proof structure A used in the present embodiment is not limited to a specific configuration, but typically, for example,
Configuration Example 1: A configuration in which the jacket material 15 releases residual gas to the outside and relaxes expansion, and
Configuration Example 2: The adsorbent 20 enclosed with the core material 14 in the outer cover material 15 is a chemical adsorption type that chemically adsorbs the residual gas, or is non-exothermic that does not generate heat due to the adsorption of the residual gas. Or a chemisorption and non-pyrogenic composition,
Etc. are exemplified.

  An example of the explosion-proof structure A of Configuration Example 1 will be described with reference to FIGS. 9A and 9B.

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

  The explosion-proof structure A of Configuration Example 1 typically includes a check valve 24 and a strength reduction portion 26 as shown in FIGS. 9A and 9B, respectively.

  FIG. 9A shows an example of an explosion-proof structure A constituted by the check valve 24. The check valve 24 has a cap-like configuration that closes a valve hole 25 provided in a part of the jacket material 15. The valve hole 25 is provided so as to penetrate the inside and outside of the jacket material 15, and the cap-shaped check valve 24 is made of an elastic material such as rubber.

  Normally, the valve hole 25 is closed by the check valve 24, so that outside air can be substantially prevented from entering the jacket material 15. Even if the jacket material 15 contracts due to a change in ambient temperature, and the inner diameter of the valve hole 25 changes accordingly, the check valve 24 is made of an elastic material. Can be closed. In the unlikely event that the residual gas expands inside the jacket material 15, the check valve 24 is easily removed from the valve hole 25 as the internal pressure rises, and the residual gas is released to the outside.

  FIG. 9B shows an example of the explosion-proof structure A configured by providing the strength reduction portion 26. The strength reduction portion 26 is configured by a portion 26a in which a part of the welding area is reduced in the welding portion between the sealing fins 13.

  In the example of the strength reduction part 26, the inner side (core material 14 side) of the welding part 26a of the sealing fin 13 is not welded. For this reason, the welding area in the site | part 26a is smaller than the welding site | part of the other sealing fin 13, and by any chance, when residual gas expand | swells inside the jacket material 15, the pressure by a raise of an internal pressure is set. It becomes easy to concentrate on the reduced strength portion 26. And the part 26a which made the welding area of the welding layer 15a small peels, and residual gas is escaped outside.

  The strength reduction portion 26 is not limited to the configuration shown in FIG. 9B in which the welding area is partially reduced, and may have a configuration in which the welding strength is partially reduced even if the welding area is the same. For example, when the sealing fin 13 is heat-welded, only a part of the heat may be applied to reduce the degree of welding at the welding site. Or you may provide the intensity | strength fall site | part 26 other than the welding location of the sealing fin 13. FIG. For example, a portion where the lamination strength is partially reduced may be formed between the heat welding layer 18 and the gas barrier layer 17 constituting the outer cover material 15 to form the strength reduction portion 26.

  Further, the strength reduction portion 26 may be formed by using a material having a part of the heat welding layer 18 having a lower welding strength than other portions. For example, as described above, low-density polyethylene can be suitably used as the heat-welding layer 18, but high-density polyethylene, ethylene-vinyl alcohol copolymer, or amorphous polyethylene is used as a part of the heat-welding layer 18. Terephthalate or the like may be used. Since these polymer materials have lower welding strength than low-density polyethylene, they can be suitably used for forming the strength-decreasing portion 26.

  Moreover, as a formation method of the strength reduction site | part 26, the structure which makes the thickness of the welding site | part of the heat welding layers 18 partly small, the adhesive agent with small adhesive strength in a part of area | region used as the welding site | part of the heat welding layer 18 In addition, a configuration in which the heat-welding layer 18 is partially peeled and the gas barrier layers 17 are directly heat-welded to each other in the region that becomes the sealing fin 13 of the jacket material 15 can be employed. .

  If an accident or the like occurs, the vacuum heat insulating material 8 may be exposed to a harsh environment. However, in the case of the present embodiment, when the vacuum heat insulating material 8 is exposed to a harsh environment and the residual gas inside expands, the check valve 24 comes off from the valve hole 25 or excessively expands from the strength lowering portion 26. It is possible to effectively avoid the deformation of the vacuum heat insulating material 8 by the pressure being dissipated to the outside. Therefore, the explosion-proof property of the vacuum heat insulating material 8 can be improved, and the safety of the heat insulating container 1 can be enhanced.

  In FIG. 9A and FIG. 9B showing the configuration of the present embodiment, the explosion-proof structure A is highlighted without showing the thermal stress dispersion layer 21 provided on the vacuum heat insulating material 8.

  On the other hand, as the explosion-proof structure A of Structural Example 2, an adsorbent composed of the ZSM-5 type zeolite described above can be used. ZSM-5 type zeolite constituting the adsorbent is a gas adsorbent having a chemical adsorption action. Therefore, for example, even if various environmental factors such as a temperature rise occur, the once adsorbed gas is substantially prevented from being released again. Therefore, even when the adsorbent 20 adsorbs the combustible gas due to some influence when handling the combustible fuel or the like, the gas is not re-released due to the influence of the subsequent temperature rise or the like. As a result, the explosion-proof property of the vacuum heat insulating material 8 can be further improved.

  Moreover, since ZSM-5 type zeolite is a nonflammable gas adsorbent, the adsorbent 20 in the present embodiment is substantially composed of only a nonflammable material. Therefore, the explosion-proof property can be further improved without using a combustible material inside the vacuum heat insulating material 8 including the core material 14.

  As described above, if the adsorbent 20 is a chemical adsorption type, the adsorbed residual gas is not easily separated as compared with the physical adsorption type, so that the degree of vacuum inside the vacuum heat insulating material 8 can be favorably maintained. it can. Moreover, since the residual gas is not desorbed, it is possible to effectively prevent the residual gas from expanding inside the jacket material 15 and deforming the vacuum heat insulating material 8. Therefore, the explosion-proof property and stability of the vacuum heat insulating material 8 can be improved.

  Further, if the adsorbent 20 is a non-heat-generating material, a non-flammable material, or a material satisfying both, foreign matter may enter the interior due to damage to the outer covering material 15 or the like. In addition, it is possible to avoid the possibility that the adsorbent 20 generates heat or burns. Therefore, the explosion-proof property and stability of the vacuum heat insulating material 8 can be further improved.

  As described above, the heat insulating container 1 according to the embodiment of the present invention improves the heat insulating property by using the vacuum heat insulating material 8 and also has the heat insulating property due to the heat shrinkage crack of the jacket material 15 of the vacuum heat insulating material 8. By suppressing the decrease, high thermal insulation can be ensured over a long period of time. 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, although the vacuum heat insulating material 8 illustrated what was adhere | attached with the adhesive agent 22 with respect to the primary heat insulation layer 7, and was fixed integrally, this is the time of the shaping | molding of the heat insulation panel 9 which comprises the primary heat insulation layer 7, The vacuum heat insulating material 8 may be integrally molded and fixed.

  Further, in the embodiment, the configuration in which the vacuum heat insulating material 8 is fixed and integrated with the primary heat insulating layer 7 together with bonding with the adhesive 22 and mechanical fixing with the head flange 11 of the bolt 10 is exemplified. However, this mechanical fixing is not necessarily required, and may be applied as needed.

  Furthermore, although the thermal stress dispersion layer 21 of the vacuum heat insulating material 8 has been illustrated as being provided on both surfaces of the vacuum heat insulating material 8, it may be provided at least on the fixed surface side to the primary heat insulating layer 7. In this case, although the effect of reducing the quality defect by improving the strength of the upper and lower surfaces of the vacuum heat insulating material 8 cannot be expected, it is sufficient to achieve the intended purpose of the present invention.

  Moreover, although the glass cloth was illustrated as the thermal stress dispersion | distribution layer 21, as long as the tensile shrinkage force by the thermal contraction of the primary heat insulation layer 7 can be disperse | distributed, what kind of thing may be sufficient as it. 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.

  Furthermore, although the thermal stress dispersion layer 21 is laminated on the outer jacket material 15 of the vacuum heat insulating material 8 to illustrate the outermost layer of the outer jacket material 15, the thermal stress dispersion layer 21 is an independent component. The adhesive 22 may be bonded and integrated with both the vacuum heat insulating material 8 and the primary heat insulating layer 7.

  In the embodiment, the example in which the heat insulating container 1 is used as a tank such as an LNG tanker is shown. However, the present invention is not limited to this example, and the heat insulating container such as a land-installed LNG tank or medical use is used. Also, a heat insulating container such as a cryogenic storage container used for industrial use may be used. The substance to be stored is not LNG, but may be any substance as long as it is 100 ° C. lower than room temperature, such as liquid hydrogen.

  As described above, the heat insulating container according to the embodiment of the present invention is a heat insulating container that holds a substance having a temperature that is 100 ° C. or lower than normal temperature, and is disposed outside the container housing and And a primary heat insulating layer disposed at least on the container housing side. And a vacuum heat insulating material disposed on the outer side of the primary heat insulating layer and having a breathable core material and a jacket material for vacuum-sealing the core material, and between the vacuum heat insulating material and the primary heat insulating layer. And a thermal stress dispersion layer disposed on the surface.

  According to such a configuration, even if there is a difference in heat shrinkage between the primary heat insulating layer and the vacuum heat insulating material and the heat shrinking force of the primary heat insulating layer is applied to the outer cover material of the vacuum heat insulating material, Is dispersed by the thermal stress dispersion layer, and it is possible to suppress the occurrence of cracks or the like due to the difference in thermal shrinkage in the jacket material of the vacuum heat insulating material. Thereby, the vacuum heat insulating material can maintain the original high heat insulating performance as it is, and can ensure the heat insulating performance of the heat insulating container well over a long period of time.

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

  According to such a configuration, in addition to the heat insulation performance of the glass cloth, it is possible to prevent cracks due to thermal contraction of the jacket material, and to improve the heat insulation of the jacket material itself, Low-temperature embrittlement can also be suppressed, reliability can be improved, and high heat insulation can be ensured for a longer period of time.

  Moreover, the vacuum heat insulating material may be comprised by laminating | stacking a thermal-stress distribution layer integrally on the surface at the side which touches at least a primary heat insulation layer of a jacket material.

  According to such a configuration, it is possible to further reduce the amount of use of the glass cloth that causes a cost increase only on one side in contact with the primary heat insulating layer. Therefore, it is possible to satisfactorily ensure the heat insulating performance of the heat insulating container over a long period while suppressing an increase in cost.

  The vacuum heat insulating material may be configured to be the outermost layer of the jacket material by integrally laminating the thermal stress dispersion layer on the upper and lower surfaces of the jacket material.

  According to such a configuration, in the vacuum heat insulating material, the outermost layers on both the upper and lower surfaces are heat stress dispersion layers having high strength. Therefore, it is possible to prevent the jacket material from being cracked or torn by handling during production, suppressing the defective product generation rate of the vacuum insulation material, and suppressing the cost increase, and the heat insulation performance of the heat insulation container Can be ensured well over a long period of time.

  Moreover, it is good also as a structure by which the inorganic fiber was used as a core material of a vacuum heat insulating material.

  According to such a configuration, even if moisture remains in the jacket material of the vacuum heat insulating material, it is possible to suppress the core material from expanding due to the moisture and preventing the vacuum heat insulating material itself from being deformed. it can. For example, when maintenance such as hot water cleaning is performed regularly, such as an LNG insulation container, the vacuum insulation is prevented from expanding and deforming even if some moisture remains in the jacket. In addition, it is possible to prevent cracking of the jacket material due to thermal expansion deformation of the vacuum heat insulating material itself. Therefore, it is possible to more reliably realize the heat insulating property of the heat insulating container.

  Moreover, the vacuum heat insulating material may be configured to have an explosion-proof structure.

  According to such a configuration, even if some moisture and air remain in the vacuum heat insulating material and expansion may occur due to the moisture or air, the expansion pressure becomes a predetermined value or more. Then, the expansion pressure can be discharged to the outside from the explosion-proof structure portion. Therefore, it is possible to prevent the explosion as it continues to expand as it is, and to ensure the safety as a heat insulating container.

  Further, the vacuum heat insulating material may have a penetrating portion, and may be configured to be mechanically fixed to the primary heat insulating layer via the penetrating portion.

  According to such a configuration, the vacuum heat insulating material is further integrated with the primary heat insulating layer in a form added with mechanical fixation. Therefore, even if the fixing force to the primary heat insulating layer of the vacuum heat insulating material becomes weak due to aging, the vacuum heat insulating material can be reliably prevented from being peeled off, and a highly reliable material can be realized.

  Further, a bolt having a flange portion is further provided, and a weld layer in which the jacket materials are in close contact with each other is formed around the through portion, and the weld layer is pressed by the flange portion of the bolt, whereby the vacuum heat insulating material is primarily insulated. The structure fixed to a layer may be sufficient.

  According to such a configuration, the vacuum heat insulating material can be further fixed without damaging the jacket material of the core material portion. Therefore, it is possible to prevent the deterioration of the heat insulating performance due to the damage of the outer cover material and the deterioration of the outer cover material, and further ensure the heat insulating performance for a long period of time.

  As described above, according to the present invention, it is possible to obtain a special effect that it is possible to suppress a decrease in heat insulation performance due to thermal shrinkage cracking of the jacket material of the vacuum heat insulating material. Therefore, the present invention can be widely applied and useful as a storage container for cryogenic substances such as LNG, and a heat insulating container for transportation.

DESCRIPTION OF SYMBOLS 1 Heat insulation container 2,102,202 Heat insulation structure 3 Support body 4 Hull 5 Cover 6 Container housing 6a Nut 7 Primary heat insulation layer 7a 1st heat insulation layer 7b 2nd heat insulation layer 7c Metal mesh 8 Vacuum heat insulation material 8a Penetrating part DESCRIPTION OF SYMBOLS 9 Heat insulation panel 10 Bolt 11 Head flange 12 Filling heat insulating material 13 Sealing fin 14 Core material 15 Cover material 15a Welding layer 16a 1st protective layer 16b 2nd protective layer 17 Gas barrier layer 18 Heat welding layer 20 Adsorbent 21 Thermal stress Dispersion layer 22 Adhesive 23 Tertiary heat insulation layer 24 Check valve 25 Valve hole 26 Reduced strength part 26a Part A Explosion-proof structure

Claims (7)

A heat insulating container for holding a substance having a temperature lower than room temperature by 100 ° C. or more,
A container housing;
A primary heat insulating layer disposed on the outer side of the container housing, disposed at least on the container housing side, disposed on the outer side of the primary heat insulating layer, and a breathable core member; and the core member A vacuum heat insulating material having a jacket material to be vacuum-sealed;
A thermal stress dispersion layer that is disposed between the vacuum heat insulating material and the primary heat insulating layer and is made of glass cloth ;
Insulated container with. 2. The heat insulating container according to claim 1, wherein the vacuum heat insulating material is configured by integrally laminating the thermal stress dispersion layer on at least a surface of the jacket material that is in contact with the primary heat insulating layer. The heat insulation container according to claim 1 or 2 , wherein the vacuum heat insulating material becomes an outermost layer of the jacket material by integrally laminating the thermal stress dispersion layer on both upper and lower surfaces of the jacket material. The heat insulation container according to any one of claims 1 to 3 , wherein inorganic fibers are used as the core material of the vacuum heat insulating material. The heat insulation container according to any one of claims 1 to 4 , wherein the vacuum heat insulating material has an explosion-proof structure. The heat insulation container according to any one of claims 1 to 5, wherein the vacuum heat insulating material has a through portion, and is further mechanically fixed to the primary heat insulating layer through the through portion. A bolt having a flange portion;
Around the penetrating portion, a weld layer in which the jacket materials are in close contact with each other is configured,
The heat insulation container according to claim 6 , wherein the vacuum heat insulating material is fixed to the primary heat insulating layer by pressing the welding layer by the flange portion of the bolt.

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