CN108700245A - Heat insulating structure body using Vacuumed insulation panel and the heat-insulated container with the heat insulating structure body - Google Patents

Abstract

A kind of heat insulating structure body (20), is used in the environment of being exposed to -40 DEG C of low temperature below, includes at least Vacuumed insulation panel (10) and other component (30).Vacuumed insulation panel (10) includes being cladded with material and to depressurize the core material that air-tight state is sealing into the inside of overcoating material.Using the surface in outside in the surface of overcoating material, as Vacuumed insulation panel (10) as when outer surface, include wetted surface area in outer surface, which, which is endowed, shows the surface state that wetability is more than the intrinsic wetability in surface.Vacuumed insulation panel (10) is configured to adjacent with other component (30) or other Vacuumed insulation panels (10) in wetted surface area across elastic material.

Description

Heat insulating structure using vacuum heat insulating material, and heat insulating structure having the heat insulating structure container

technical field

The present disclosure relates to a heat insulating structure using a vacuum heat insulating material having a structure in which a core material is sealed in a reduced-pressure airtight state, and a heat insulating container including the heat insulating structure.

Background technique

The vacuum heat insulating material has a structure in which a core material is decompressed and hermetically sealed in an outer covering material (outer covering material) having gas barrier properties. Generally, a laminated film obtained by laminating functional layers such as a heat-sealing layer, a surface protective layer, and a gas barrier layer is used as the covering material.

Vacuum heat insulating materials are widely used in household products such as electrification products and housing materials, but in recent years, their use in production products is also being considered. Products for production include, for example, ships such as gas tankers, heat-insulating containers for holding low-temperature fluids such as LNG (liquefied natural gas) tanks, and automobiles (for example, for the insulation of car bodies, engines, transmissions, and batteries).

In a vacuum heat insulating material, it is known to give a resin coating to the surface of a covering material in order to maintain heat insulating performance for a long time.

For example, Patent Document 1 discloses a vacuum heat insulating material having a structure in which a gas barrier layer of an outer covering material is formed as a vapor-deposited layer of metal, metal oxide, or silicon dioxide, and the vapor-deposited layer is coated with Acrylic layer. In this patent document 1, household electrical appliances such as electric water heaters, that is, consumer goods are exemplified as typical applications.

There is a tendency that the characteristics of the thermal insulation performance of the heat insulating structure using the vacuum heat insulating material are required to be stricter in the product for production than in the product for consumer use. For example, in ships such as the above-mentioned gas tanker, it is necessary to keep fluid for a long time at a low temperature significantly lower than normal temperature. Therefore, the heat insulating structure using the vacuum heat insulating material can be used for a long time in a low temperature environment. In addition, since ships may be exposed to temperatures higher than normal during maintenance, thermal insulation structures using vacuum insulation materials are used not only in low-temperature environments but also in environments where very large temperature differences occur. . Furthermore, ships are expected to be used for a longer period of time (for example, several decades) than consumer products, and thus longer-term reliability is required for a heat insulating structure using a vacuum heat insulating material.

In the vacuum heat insulating material disclosed in Patent Document 1, by applying an acrylic resin layer to the vapor deposition layer, it is possible to maintain thermal insulation performance over a long period of time in consumer products. However, in the field of production products, heat insulation performance is higher than that of consumer products, so in the field of production products, heat insulation structures using vacuum heat insulating materials that can achieve good heat insulation performance are required.

prior art literature

patent documents

Patent Document 1: Japanese Patent Laid-Open No. 2005-307995

Contents of the invention

This disclosure relates to a heat insulating structure in which the reliability of heat insulating performance is further optimized so that it can be applied to a product for production among heat insulating structures using vacuum heat insulating materials.

The heat insulating structure of the present disclosure is a heat insulating structure that is used in an environment exposed to a low temperature of -40° C. or lower and includes at least a vacuum heat insulating material and other components. The vacuum heat insulating material includes an outer covering material and a core material sealed inside the outer covering material in a pressure-reduced airtight state.

When the surface of the outer covering material that becomes the outer surface of the vacuum heat insulating material is used as the outer surface, the outer surface includes a wetted surface area, and the wetted surface area is endowed with a wettability greater than that of the surface. wettability of the surface state.

The vacuum insulation is configured to be adjacent to other components or other vacuum insulation in the area of the wetted surface through the elastomeric material.

According to such a structure, the wetted surface area is formed on the outer surface of the vacuum heat insulating material constituting the heat insulating structure, and the vacuum heat insulating material and other members are adjacent to each other in the wetted surface area with the elastic material interposed therebetween, or The vacuum insulations are adjacent to each other with the wetted surface regions interposed between each other by the elastic material.

When the thermal insulation structure is used in an environment exposed to low temperatures below -40°C, the temperature difference from normal temperature is large, so a large thermal stress may occur, but due to the existence of the elastic material, the thermal stress can be alleviated Impact. And since the outer surface of the vacuum heat insulating material which an elastic material contacts closely becomes a wetted surface area, favorable adhesiveness can be ensured between an elastic material and a vacuum heat insulating material. As a result, in the heat insulating structure using the vacuum heat insulating material, the reliability of the heat insulating performance can be optimized so that it can be applied to a product for production.

Moreover, this indication also includes the heat insulation container which has the heat insulation structure of the said structure.

According to the present disclosure, in a heat insulating structure using a vacuum heat insulating material, the reliability of heat insulating performance can be further optimized, and furthermore, it can be applied to a product for production.

Description of drawings

Fig. 1 is a schematic cross-sectional view showing an example of the structure of a vacuum heat insulating material used in a heat insulating structure according to a first embodiment of the present disclosure.

Fig. 2 is a schematic partial cross-sectional view showing an example of the structure of the heat insulating structure of the present disclosure using the vacuum heat insulating material shown in Fig. 1 .

Fig. 3A is a schematic plan view showing an example of the adhesive applied to the back surface of the vacuum heat insulating material in the heat insulating structure shown in Fig. 2 .

Fig. 3B is a schematic plan view showing another example of the adhesive applied to the back surface of the vacuum heat insulating material in the heat insulating structure shown in Fig. 2 .

Fig. 4A is a schematic partial side view showing another example of the heat insulating structure of the present disclosure using the vacuum heat insulating material shown in Fig. 1 .

Fig. 4B is a schematic partial side view showing still another example of the heat insulating structure of the present disclosure using the vacuum heat insulating material shown in Fig. 1 .

5A is a schematic diagram showing a schematic configuration of a spherical independent tank type LNG transport tanker (tanker) having a spherical tank as an example of a heat insulating container according to a second embodiment of the present disclosure to which the heat insulating structure of the present disclosure is applied. .

FIG. 5B is a schematic diagram showing a schematic structure of a spherical tank corresponding to the 5B-5B arrow cross-section in FIG. 5A .

6A is a schematic diagram showing a schematic structure of a membrane system LNG transport tanker having an inboard tank as a heat insulating container according to a third embodiment of the present disclosure to which the heat insulating structure of the present disclosure is applied.

FIG. 6B is a schematic diagram showing a schematic structure of an inboard tank corresponding to the 6B-6B arrow cross section in FIG. 6A .

7 is a schematic partial cross-sectional view showing a typical structure of an above-ground LNG tank as a heat-insulating container according to a fourth embodiment of the present disclosure to which the heat-insulating structure of the present disclosure is applied.

8 is a schematic cross-sectional view showing another example of a representative structure of an underground LNG tank as a heat-insulating container according to a fourth embodiment of the present disclosure to which the heat-insulating structure of the present disclosure is applied.

9 is a schematic cross-sectional view showing a typical structure of a hydrogen tank as a heat-insulated container according to a fifth embodiment of the present disclosure to which the heat-insulated structure of the present disclosure is applied.

Detailed ways

The heat insulating structure of the present disclosure is used in an environment exposed to a low temperature of -40°C or lower, and includes at least a vacuum heat insulating material and other components. The vacuum heat insulating material includes an outer covering material and a core material sealed inside the outer covering material in a pressure-reduced airtight state. When the surface of the outer covering material that becomes the outer surface of the vacuum heat insulating material is used as the outer surface, the outer surface includes a wetted surface area, and the wetted surface area is endowed with a wettability greater than that of the surface. wettability of the surface state. The vacuum insulation is configured to be adjacent to other components or other vacuum insulation in the area of the wetted surface through the elastomeric material.

According to such a structure, the wetted surface area is formed on the outer surface of the vacuum heat insulating material constituting the heat insulating structure, and the vacuum heat insulating material and other members are adjacent to each other in the wetted surface area with the elastic material interposed therebetween, or The vacuum insulations are adjacent to each other with the wetted surface regions interposed between each other by the elastic material. When the thermal insulation structure is exposed to a low temperature environment below -40°C, a large thermal stress may occur due to the large temperature difference from normal temperature, but the presence of the elastic material can alleviate the thermal stress. The effect of stress.

And since the outer surface of the vacuum heat insulating material which an elastic material contacts closely becomes a wetted surface area, favorable adhesiveness can be ensured between an elastic material and a vacuum heat insulating material. As a result, in the heat insulating structure using the vacuum heat insulating material, the reliability of the heat insulating performance can be optimized so that it can be applied to a product for production.

Furthermore, in the heat insulating structure of the present disclosure, the wetted surface area may be constituted by surface treatment or resin coating on the outer surface.

According to such a structure, further, by subjecting the surface of the covering material to surface treatment or resin coating, it is possible to appropriately realize a wetted surface area exhibiting wettability greater than that inherent to the surface of the covering material.

In addition, in the heat insulating structure of the present disclosure, the wetted surface area may be given to at least the back surface of the vacuum heat insulating material in the outer surface. In addition, the vacuum heat insulating material may be configured to adhere to other members by partially applying an adhesive that is an elastic material on the back surface.

According to such a structure, furthermore, an elastic material is an adhesive agent, and this adhesive agent is partially applied to the back surface of a vacuum heat insulating material. Therefore, the applied adhesive can be held well on the back surface of the vacuum heat insulating material, and when the adhesive is not completely applied on the back surface, shrinkage due to large thermal stress can be well relieved. Impact.

In addition, in the heat insulating structure of the present disclosure, the adhesive may include a first adhesive having adhesiveness at normal temperature and a second adhesive having higher adhesiveness than the first adhesive at low temperature. Adhesive. In addition, the first adhesive and the second adhesive may be applied to different parts of the back surface, respectively.

According to such a structure, since the first adhesive and the second adhesive are used together as an elastic material, it is possible to realize adhesion superior to the adhesiveness of the first adhesive in a temperature range of normal temperature and its vicinity. state. In addition, in a temperature range of low temperature and its vicinity, an adhesive state superior to the adhesiveness of the second adhesive can be realized. Therefore, since the two kinds of adhesives can exhibit good adhesiveness in temperature ranges different from each other, a good bonded state of the vacuum heat insulating material can be stably realized in a wide temperature range.

In addition, in the heat insulating structure of the present disclosure, the first adhesive and the second adhesive may be alternately applied on the back surface.

According to such a structure, by applying|coating a 1st adhesive agent and a 2nd adhesive agent alternately, the back surface of a vacuum heat insulating material can stably realize a favorable bonding state in a wide temperature range.

In addition, in the heat insulating structure of the present disclosure, the first adhesive and the second adhesive may be applied on the back so that the application area of the first adhesive is larger than the application area of the second adhesive. Coated structure.

According to such a structure, since the application area of the first adhesive is larger than the application area of the second adhesive, it is possible to stably achieve a good bonding state in a wide temperature range on the back side of the vacuum heat insulating material. .

In addition, in the heat insulating structure of the present disclosure, the first adhesive may be a hot-melt adhesive, and the second adhesive may be a reactive adhesive.

According to such a structure, further, by using together a hot-melt adhesive and a reactive adhesive, the back surface of a vacuum heat insulating material can realize a favorable bonding state more stably in a wide temperature range.

In addition, in the heat insulating structure of the present disclosure, a structure in which the peel strength of the adhesive is 13N or more in a width of 25 mm can be employed.

According to such a structure, further, if the lower limit of the peeling strength of an adhesive agent is the said value, a vacuum heat insulating material can be bonded more favorably with respect to the surface of another member.

In addition, in the heat insulating structure of this disclosure, a vacuum heat insulating material includes a plurality of vacuum heat insulating materials, and a wetted surface area may be given to a region of at least an outer side surface of the vacuum heat insulating material among the outer surfaces. Moreover, you may comprise so that the filler which is an elastic material may be filled in at least the outer side of the space|gap formed between the vacuum heat insulating materials arrange|positioned adjacently among some vacuum heat insulating materials.

According to such a structure, further, a filler exists in the abutment part of the side surfaces of some vacuum heat insulating materials, and the side surface of the vacuum heat insulating material which a filler closely contacts becomes a wetted surface area. Therefore, when a filler adheres favorably to the side surface of a vacuum heat insulating material, the high airtightness of the heat insulation layer which consists of a vacuum heat insulating material can be achieved favorably. In addition, the influence of shrinkage due to large thermal stress can be moderated favorably by the filler.

Furthermore, in the heat insulating structure of the present disclosure, the filling material may be composed of a thermosetting resin elastomer material.

In this way, if the filler is made of an elastomer material such as silicone rubber or soft polyurethane, the influence of shrinkage due to large thermal stress can be more favorably alleviated.

Furthermore, in the heat insulating structure of the present disclosure, the surface treatment may be corona treatment, ozone treatment, or plasma treatment, and the resin coating may be urethane coating or silicon coating.

According to such a structure, it is further possible to satisfactorily form a wetted surface area on at least the outer surface area of the surface of the covering material.

Moreover, this indication also includes the heat insulation container which has the heat insulation structure of the said structure.

In any of the above-mentioned configurations, since the above-mentioned vacuum heat insulating material is provided, the reliability of heat-insulating performance can be further optimized in a heat-insulating structure or a heat-insulating container, and furthermore, it can be applied to products for production.

Hereinafter, preferred embodiments of the present disclosure will be described with reference to the drawings. In addition, in the following description, the same reference numerals are assigned to the same or corresponding elements in all the drawings, and overlapping description thereof will be omitted.

(first embodiment)

[Vacuum insulation]

First, a representative example of the vacuum heat insulating material applied to the heat insulating structure of the present disclosure will be specifically described with reference to FIG. 1 .

As shown in FIG. 1 , the vacuum heat insulating material 10 of the present embodiment includes: an outer covering material (outer covering material) 11; 12 ; and the adsorbent 13 sealed inside the cover material 11 together with the core material 12 .

The cover material 11 is a bag-shaped member having gas barrier properties. In this embodiment, for example, as shown in FIG. 1 , two laminated sheets are opposed to each other and sealed to form a bag shape. The seal part 14 which is a surrounding sealing part does not have the core material 12 inside, and laminated|stacked sheets are in the state which contacted each other, and are formed in the fin shape extended from the main body of the vacuum heat insulating material 10 to the outer periphery.

The specific structure of the laminated sheet is not particularly limited, and examples include a structure in which three layers of a surface protective layer, a gas barrier layer, and a heat-sealing layer are sequentially laminated.

The surface protection layer is a resin layer for protecting the outer surface of the vacuum heat insulating material 10 . For the surface protection layer, a known resin film such as a nylon film, a polyethylene terephthalate film, or a polypropylene film is used, but is not particularly limited thereto. The surface protective layer may be composed of only one type of film, or may be composed of a plurality of films laminated.

The gas barrier layer is a layer for preventing outside air from entering the inside of the vacuum heat insulating material 10 , and a known film having gas barrier properties can be used suitably. Examples of the film having gas barrier properties include metal foils such as aluminum foil, copper foil, or stainless steel foil; a vapor-deposited film in which a metal or metal oxide is deposited on a resin film as a substrate; Coating-treated film, etc., but not particularly limited thereto. Examples of substrates used for vapor deposition include polyethylene terephthalate films and ethylene-vinyl alcohol copolymer films, and examples of metals or metal oxides include aluminum, copper, aluminum oxide, and silicon dioxide. etc., but not particularly limited thereto.

The heat-sealing layer is a layer for bonding laminated sheets to each other, and also functions as a layer for protecting the surface of the gas barrier layer. That is, one surface (outer surface) of the gas barrier layer is protected by the surface protective layer, and the other surface (inner surface) is protected by the heat-sealing layer. Since the core material 12 and the adsorbent 13 are sealed inside the vacuum heat insulating material 10 , the effect on the gas barrier layer due to these internal substances can be prevented or suppressed by the heat-sealing layer. Examples of the heat-sealing layer include films made of thermoplastic resins such as low-density polyethylene, but are not particularly limited thereto.

In addition, the laminated sheet may include layers other than the surface protection layer, the gas barrier layer, and the heat-sealing layer. In addition, the gas barrier layer and the heat-sealing layer may be composed of only one type of film, or may be composed of a plurality of films, as in the case of the surface protection layer. In other words, the specific structure of the laminated sheet used as the outer covering material 11 is not particularly limited as long as it satisfies the following conditions: one of a pair of surfaces (inner surface and outer surface) is a heat-sealing layer; and the multilayer structure has a gas barrier layer (or any layer in the multilayer structure has gas barrier properties).

In addition, as the cover material 11 , any known structure other than a laminated sheet can be employed as long as it can exhibit gas barrier properties.

The core material 12 is not particularly limited as long as it has heat insulating properties. Specifically, known materials such as fiber materials and foam materials can be mentioned. For example, in this embodiment, inorganic fibers are used as the core material 12 . The inorganic fibers may be fibers as long as they are made of inorganic materials, and specific examples thereof include glass fibers, ceramic fibers, slag wool fibers, rock wool fibers, and the like. In addition, since the core material 12 may be used in a plate shape, it may contain at least any one of known binder materials and powders in addition to these inorganic fibers. These materials contribute to improving physical properties such as strength, uniformity, and rigidity of the core material 12 .

The specific shape and the like of the core material 12 are not particularly limited, but a typical example is one in which inorganic fibers such as glass fibers are formed into a plate shape. Specifically, for example, glass fibers are laminated in a flat form, the laminate is placed in a jig, heated in a pressurized state by pressurization, etc., and molded to a density and thickness within a predetermined range to obtain a core. Material 12. The press conditions, heating conditions, etc. of glass fiber are not specifically limited, The well-known conditions in the manufacturing field of the vacuum heat insulating material 10 can be used suitably.

The adsorbent 13 adsorbs and removes the residual gas (including water vapor) released from the fine gaps in the core material 12 and the outside air that enters from the sealing part 14 and the like after the core material 12 is depressurized and sealed to the inside of the cover material 11. (including water vapor). The specific type of the adsorbent 13 is not particularly limited, and a material selected from known materials including zeolite, calcium oxide, and silica gel can be suitably used. Moreover, the vacuum heat insulating material 10 should just include the covering material 11 and the core material 12 at least, and may contain members other than the said covering material 11, the core material 12, and the adsorbent 13.

The specific manufacturing method of the vacuum heat insulating material 10 is not specifically limited, A well-known manufacturing method can be used suitably. In this embodiment, first, the bag body of the covering material 11 is obtained by superimposing two sheets of the covering material 11 and thermally welding the peripheral parts so as to form an opening. Thereafter, the core material 12 and the adsorbent 13 are inserted into the bag body of the cover material 11 from the opening, and the pressure is reduced in a decompression device such as a decompression chamber, for example. Thereby, the inside of the bag body of the covering material 11 is sufficiently depressurized from the opening, and becomes substantially vacuum state. Thereafter, the opening is hermetically sealed by thermal welding similarly to the other peripheral portions, whereby the vacuum heat insulating material 10 is obtained.

In addition, various conditions such as thermal welding and reduced pressure are not particularly limited, and various known conditions can be appropriately adopted. In addition, the bag body of the covering material 11 is not limited to the structure in which the surroundings of two covering materials 11 are thermally welded. For example, the bag body of the covering material 11 having an opening can be obtained by bending one sheet of the covering material 11 in half and thermally welding both side edges. Alternatively, the bag body of the covering material 11 having an opening can be obtained by forming the covering material 11 into a cylindrical shape and sealing one opening.

[Heat insulation structure: make it stick to other parts]

Next, a typical example of the heat insulating structure of this disclosure is demonstrated concretely with reference to FIG. 2, FIG. 3A, FIG. 3B, FIG. 4A, and FIG. 4B.

As shown in FIGS. 2 to 4B , the heat insulating structure 20 of the present disclosure includes at least the vacuum heat insulating material 10 and other members 30 , and is used in an environment exposed to a low temperature of -40°C or lower. As the heat insulating structure 20 used in such a low-temperature environment, for example, an LNG tanker transporting liquefied natural gas (LNG) illustrated in the second embodiment or the third embodiment described later can be mentioned.

LNG is generally a low-temperature fluid at about -162°C, and the LNG tank holding it inside has a heat-insulating structure to prevent heat from entering the inside. The period during which the LNG tanker transports LNG is, for example, about four weeks. During this period, the temperature of the outer surface of the heat insulating structure is about -130°C. In addition, the LNG tanker after transporting LNG does not discharge LNG from the LNG tank to make it completely empty, but keeps a part of the LNG to suppress the temperature change. Therefore, during the voyage of the LNG tanker, the temperature of the outer surface of the heat insulating structure is as low as about -130°C.

On the other hand, LNG tankers receive maintenance at maintenance yards every few years. At this time, the LNG tank may be exposed to a high temperature exceeding normal temperature, for example, the outer surface of the heat insulating structure may be about +80°C. Therefore, it is necessary to assume that the heat insulating structure of the LNG tank is used at a temperature difference of -130°C to +80°C (a temperature difference of Δ210°C).

If a temperature difference as large as Δ210°C occurs in the heat insulating structure, a large thermal stress corresponding to the temperature difference will be generated. In addition, ships such as LNG tankers are expected to be used for a long period of time, for example, over several decades. Therefore, the heat insulating structure is required to be able to withstand large thermal stress and to achieve high reliability over a long period of time even if such thermal stress occurs.

Then, in the heat insulating structure 20 of the present disclosure, at least a part of the surface of the outer covering material 11 serving as the outer surface of the vacuum heat insulating material 10 is provided with high wettability, and the other member 30 is formed through an elastic material. or other vacuum insulation 10 adjacent to the wettability imparted surface. Accordingly, large thermal stress can be relieved by the elastic material. Moreover, since the wettability of the outer surface of the vacuum heat insulating material 10 which an elastic material is in close contact with is large, favorable adhesion between an elastic material and the vacuum heat insulating material 10 can be ensured. As a result, in the heat insulating structure 20 using the vacuum heat insulating material 10, the reliability of heat insulation performance can be optimized more.

The relatively high wettability referred to here means "wettability greater than the wettability inherent to the surface of the covering material 11". In addition, the surface area of the covering material 11 provided with such a surface state exhibiting such a large wettability is referred to as a "wetted surface area". It is sufficient that the wetted surface area is formed on the surface to be the outer surface of the vacuum heat insulating material 10 among the surfaces of the covering material 11 , that is, the "outer surface".

For example, in the heat insulating structure 20 shown in FIG. 2, the vacuum heat insulating material 10 is bonded by the adhesive 15 which is an elastic material in the state bent so that the sealing part 14 may follow one outer surface. Attached to other parts 30. In other words, the adhesive 15 as an elastic material exists between the vacuum heat insulating material 10 and the other member 30 .

Here, the outer surface of the vacuum heat insulating material 10 that faces the other member 30 is referred to as the "back surface 10b", the outer surface that does not face the other member 30 (the outer surface on the opposite side to the back surface 10b) is referred to as the "front surface 10a", and The peripheral outer surface other than the front surface 10a and the back surface 10b is referred to as "side surface 10c". Furthermore, in the structure shown in FIG. 2 , it is sufficient that the wetted surface region is formed at least on the outer surface of the cover material 11 to be the rear surface 10 b.

In addition, the wetted surface area may be formed on the outer surface (at least any one of the front surface 10a and the side surface 10c ) other than the rear surface 10b. In addition, the wetted surface region may be formed over the entire outer surface to be the rear surface 10b (or another outer surface if necessary), or may be formed only locally.

As will be described later, the adhesive 15 which is an elastic material may be partially applied to the back surface 10b, so a wet surface area can be locally provided (formed) on the outer surface to be the back surface 10b. In addition, when the outer surface of the sealing portion 14 bent toward the back surface 10b faces the outer surface of the other member 30, a wetted surface can also be formed on the outer surface of the outer covering material 11 that becomes the outer surface of the sealing portion 14. area.

As described above, the wetted surface region is only a region that exhibits a surface state having a wettability higher than that inherent to the surface of the covering material 11 , and the method for realizing such a surface state is not particularly limited. Typically, surface treatment or resin coating on the outer surface of the cover material 11 can be mentioned. Specific surface treatments include, for example, corona treatment, ozone treatment, or plasma treatment, but are not particularly limited thereto. In addition, although a polyurethane coating or a silicon coating can be mentioned as a specific resin coating, it is not specifically limited to these. Specific types of surface treatment and resin coating can be appropriately selected according to the type, structure, material, and the like of the sheet (laminated sheet, etc.) used as the cover material 11 .

The method of evaluating the wetted surface area, that is, the method of evaluating the wettability imparted to the surface of the covering material 11 that is greater than the wettability inherent to the surface of the covering material 11, is not particularly limited, but in this embodiment, the method based on The judging method of the wetting reagent or the dyne pen method shall be used for evaluation.

In the heat insulating structure 20 shown in FIG. 2, the vacuum heat insulating material 10 is adhere|attached to the outer surface of the other member 30 by apply|coating the adhesive agent 15 which is an elastic material partially to the back surface 10b. Since the wet surface area is formed in the outer surface used as the back surface 10b, the applied adhesive 15 can be held favorably on the back surface 10b of the vacuum heat insulating material 10. In addition, since the adhesive 15 is not applied to the entire surface of the back surface 10b, the influence of shrinkage due to large thermal stress can be moderated favorably.

The specific type of adhesive 15 as an elastic material is not particularly limited, and can be determined according to various conditions such as the type and structure of the vacuum heat insulating material 10, the type and structure of the covering material 11, and the use conditions and applications of the heat insulating structure 20. Choose appropriately.

In this embodiment, as the adhesive 15 , as shown in FIGS. 3A and 3B , a first adhesive 151 and a second adhesive 152 are used in combination. The first adhesive 151 and the second adhesive 152 are partially applied separately on the back surface 10b (applied to different parts).

The first adhesive 151 is not particularly limited as long as it has adhesiveness (or cohesiveness) at room temperature. In addition, it is preferable that the first adhesive 151 can exhibit adhesiveness (stickiness) initially. Thereby, when constructing the heat insulating structure 20, the vacuum heat insulating material 10 can be stuck to a desired position with respect to the other member 30, without using a positioning member etc.

A hot-melt adhesive can be mentioned as a representative 1st adhesive agent 151. As shown in FIG. The hot-melt adhesive is composed of a material that is solid or semi-solid at normal temperature and liquid at high temperature as a main component. The hot melt adhesive basically does not contain a solvent or the like. The hot-melt adhesive is applied after heating to melt and liquefy, and then solidified by cooling to exert an adhesive effect. Therefore, good adhesiveness can be exhibited in normal temperature and its peripheral temperature range.

The specific hot-melt adhesive is not particularly limited, but representative examples include ethylene vinyl acetate (EVA)-based adhesives, polyamide (PA)-based adhesives, and polypropylene (PP)-based adhesives. or rubber adhesives, etc. In addition, these respective adhesives can be combined appropriately and mixed at a predetermined ratio for use.

The second adhesive 152 only needs to have higher adhesiveness (or cohesiveness) than the first adhesive 151 at a low temperature of -40° C. or lower, and a representative example thereof is a reactive adhesive. The reactive adhesive can be one-component (one-component type) or two-component type (two-component type). The specific reactive adhesive is not particularly limited, and examples thereof include polyurethane-based adhesives, epoxy-based adhesives, and nylon-based adhesives.

A reactive adhesive tends to have a low elastic modulus in a high temperature (higher than normal temperature) temperature range, but a higher elastic modulus in a low temperature (lower than normal temperature) temperature range. Materials that exhibit adhesiveness have high cohesion and elasticity, so reactive adhesives can exhibit good adhesiveness even at low temperatures below -40°C. In addition, although hot melt adhesives can exhibit good adhesiveness at room temperature and its vicinity, they cannot exhibit sufficient adhesiveness at low temperatures of -40°C or lower.

In this embodiment, as described above, the first adhesive 151 and the second adhesive 152 are used together as elastic materials. Thus, in a temperature range between room temperature and its vicinity, a good sticking state can be realized by utilizing the adhesiveness (or cohesiveness) of the first adhesive 151 . In addition, in a low temperature range of -40° C. or lower and a temperature range therearound, a good sticking state can be realized by utilizing the adhesiveness (or cohesiveness) of the second adhesive 152 .

In addition, as described above, as the second adhesive 152, for example, a reactive adhesive is preferably used, but the adhesive strength of the reactive adhesive gradually increases with time. Therefore, when constructing the heat insulating structure 20, in the initial state which attached the vacuum heat insulating material 10 to the other member 30 at normal temperature, adhesive strength will be in a low state. Here, as long as the first adhesive 151 has adhesiveness (or cohesiveness) at normal temperature, even in the initial stage when the adhesive strength of the second adhesive 152 is low, the first adhesive can be used. The adhesive strength of the agent 151 achieves good adhesion.

Further, as mentioned above, as the first adhesive 151, for example, a hot-melt adhesive is preferably used, but the hot-melt adhesive can achieve high adhesive strength near normal temperature, but in a high temperature range, In some cases, sufficient adhesive strength cannot be exhibited in the temperature range around normal temperature.

For example, in commercially available hot melt adhesives, good peel strength can be measured in the temperature range of -20°C to +40°C including the general normal temperature range (20°C ± 15°C), but if it exceeds + At a high temperature of 50°C to +60°C, the peel strength decreases. On the other hand, in the case of reactive adhesives, the adhesive strength is low in the initial state, but when sufficient time passes, good peel strength can be measured even if it exceeds +50°C to +60°C. Therefore, by using the first adhesive 151 and the second adhesive 152 in combination, good adhesive strength can be achieved over a wide temperature range.

In the present embodiment, the method of evaluating the adhesive strength of the adhesive 15 is not particularly limited, but it may be evaluated by peel strength as described above. Specifically, it can be evaluated by, for example, a 180° peel test prescribed in JIS Z0237 or JIS K6854-2. In this embodiment, the peeling speed in the 180° peeling test may be changed from the conditions specified in JIS, for example, a peeling speed of 300 mm/min may be adopted.

In the present disclosure, the peel strength of the adhesive 15 is not particularly limited, but basically, it may be 13N or more for a width of 25 mm. If the lower limit value of the peeling strength of the adhesive agent 15 is the said value, the vacuum heat insulating material 10 can be adhere|attached favorably to the outer surface of the other member 30.

The application method of the adhesive 15 on the back surface 10b of the vacuum heat insulating material 10 is not particularly limited, and as the adhesive 15, when the first adhesive 151 and the second adhesive 152 are used in combination, for example, As shown in FIG. 3A or FIG. 3B , the first adhesive 151 and the second adhesive 152 are alternately applied on the back surface 10 b along a certain direction.

Thereby, the bonded state of the vacuum heat insulating material 10 and the other member 30 can be realized stably in a wide temperature range. In addition, in FIG. 3A , the first adhesive 151 and the second adhesive 152 are applied alternately in a straight line, but for the convenience of explanation, the first adhesive 151 is illustrated with a thick line, and the hollow line is used to illustrate the first adhesive 151. The thick line illustrates the second adhesive 152 .

In addition, in the application method shown in FIG. 3B , the application area of the first adhesive 151 is wider than the application area of the second adhesive 152 . In the example shown in FIG. 3B, the first adhesive 151 is applied in a coil-like drawing manner, and the second adhesive 152 is applied in a linear form as in FIG. 3A (also in FIG. 3B and FIG. 3A, likewise, the second adhesive 152 is shown as a hollow thick line). In this way, the application area of the first adhesive 151 is wider than the application area of the second adhesive 152 , and it is possible to stably realize good thermal insulation on the back surface 10b of the vacuum heat insulating material 10 in a wide temperature range. Paste state.

[Heat insulation structure: Adjacent arrangement of vacuum insulation materials]

Here, when the heat insulating structure 20 includes a plurality of vacuum heat insulating materials 10 , as shown schematically in FIG. 2 , the vacuum heat insulating materials 10 may be adhered to the outer surface of another member 30 side by side. In the example shown in FIG. 2 , one vacuum heat insulating material 10 is indicated by a solid line, and only the ends of two vacuum heat insulating materials 10 arranged adjacent to the vacuum heat insulating material 10 are shown by dotted lines. .

4A and 4B show a state in which end faces (side surfaces 10 c ) of the respective vacuum heat insulating materials 10 face each other when a plurality of vacuum heat insulating materials 10 are adjacently arranged. A gap is formed between the joints of the vacuum heat insulating materials 10 , that is, between the opposing side surfaces 10 c. Most of the gap is filled with a heat insulating material 18, for example, and on the outside of the gap, as an elastic material, a filler material 16 made of silicone rubber (refer to FIG. 4A ) or a filler material 17 made of soft polyurethane (refer to FIG. 4A ) is filled. 4B).

Therefore, in the seam configuration shown in FIG. 4A or FIG. 4B , the wetted surface area is formed in the area of at least the side surface 10c on the outer side (front side 10a side) of the vacuum heat insulating material 10 among the outer surfaces of the covering material 11, That is, the area surrounded by the dotted ellipse in FIGS. 4A and 4B may serve as the outer surface 10d.

In addition, in FIG. 4A and FIG. 4B , for convenience of explanation, the other members 30 are shown by dotted lines, and the adhesive 15 is not shown. In addition, the wetted surface area may be imparted not only to the outer side 10d, but also to the entirety of the side 10c.

In this way, the filling materials 16 and 17 are present at the overlapping portions of the side surfaces 10c of the plurality of vacuum heat insulating materials 10, and the filling materials 16 and 17 can be bonded to the vacuum heat insulating material 10 as long as at least a wetted surface area is formed on the outer surface 10d. The side surface 10c of is well adhered to. As a result, the airtightness of the heat insulation layer comprised by the vacuum heat insulating material 10 can be realized favorably. Moreover, even if shrinkage occurs by a large thermal stress, it can be well relaxed by the filler 16 and 17 which exist in the joint (adjacent part, connection part) of some vacuum heat insulating materials 10 mutually.

The fillers 16 and 17 may be configured as linear members so that the gap between the vacuum heat insulating materials 10 can be filled. The specific structure of the filling material 16 is not particularly limited, and it may be constituted by an elastic material similarly to the above-mentioned adhesive 15 . In the present embodiment, as described above, a linear material made of silicone rubber (filler 16) or a linear material made of soft polyurethane (filler 17) is exemplified, but the fillers 16 and 17 are made of silicone rubber or A thermoplastic resin elastomer material such as soft polyurethane may be used. If such a thermoplastic elastomer material is used, the influence of shrinkage due to large thermal stress can be more favorably alleviated at the joint (adjacent site, connection site) of the vacuum heat insulating materials 10 .

In addition, although the concrete kind of the other member 30 illustrated in FIG. 2, FIG. 4A, and FIG. 4B is not specifically limited, Typically, other heat insulating materials other than the vacuum heat insulating material 10 can be mentioned. Examples of other heat insulating materials include foamed resin-based heat insulating materials such as styrene foam (styrene foam), polyurethane foam, or phenolic foam, or inorganic materials such as glass wool or pearlite filled in a heat insulating frame. class of insulation materials. Of course, it can also be comprised with a well-known heat insulating material other than the above. Furthermore, other insulating materials can also be formed as insulating panels.

Thus, according to the present embodiment, the wetted surface region is formed on the outer surface of the vacuum heat insulating material 10 constituting the heat insulating structure 20, and the vacuum heat insulating material 10 and other members 30 are wetted with the elastic material interposed therebetween. The wetted surface areas are adjacent, and the vacuum heat insulating materials 10 are adjacent to each other with the elastic material interposed between the wetted surface areas.

When the heat insulating structure 20 is exposed to a low temperature environment below -40°C and used, the temperature difference from normal temperature is large, so a large thermal stress may occur, but due to the presence of the elastic material, the thermal stress can be alleviated. The effect of stress. And since the outer surface of the vacuum heat insulating material 10 which an elastic material closely contacts becomes a wetted surface area, favorable adhesiveness can be ensured between an elastic material and the vacuum heat insulating material 10. As a result, in the heat insulating structure 20 using the vacuum heat insulating material 10, the reliability of heat insulation performance can be optimized further, and it can apply to a product for production further.

(second embodiment)

In the above-mentioned first embodiment, a representative structure of the heat insulating structure 20 of the present disclosure was exemplified. As a specific example, the spherical tank 101 for LNG installed in 100 A of LNG transfer tank ships shown to FIG. 5A is taken as an example and demonstrated.

As shown in FIG. 5A , the LNG transportation tank ship 100A of this embodiment is a tank ship of a spherical independent tank type, and has a plurality of spherical tanks 101 (five in total in FIG. 5A ). The plurality of spherical tanks 101 are arranged in a row along the longitudinal direction of the hull 102 .

As shown in FIG. 5B , each spherical tank 101 has a container main body 104 , and the inside of the container main body 104 serves as an internal space (fluid holding space) for storing (or holding) LNG. In addition, most of the spherical tank 101 is externally supported by the hull 102 , and the upper part thereof is covered by a cover 103 .

As shown in FIG. 5B , the container body 104 includes a container case 106 and a heat insulating structure 105 that insulates the outer surface of the container case 106 . The container case 106 is configured to hold a low-temperature substance such as LNG that needs to be stored at a temperature lower than normal temperature, and is made of metal such as stainless steel or aluminum alloy. The temperature of LNG is usually -162° C., so as a specific container case 106 , an aluminum alloy case having a thickness of about 50 mm can be cited. In addition, the container case 106 may be made of stainless steel with a thickness of about 5 mm.

The heat insulating structure 105 may have a structure including the heat insulating structure 20 described above. A typical structural example of the heat insulating structure 105 is a multilayer structure in which a plurality of heat insulating layers are arranged outside the container case 106 . What is necessary is just to use the said vacuum heat insulating material 10 for at least one layer among these several heat insulating layers, and to stick this vacuum heat insulating material 10 to another heat insulating material which is another member 30.

In this embodiment, although the heat insulation structure 20 which made the vacuum heat insulating material 10 bonded to another heat insulation material is comprised as a "heat insulation board", the structure of the heat insulation structure 20 is not limited to this. If the heat insulating layer is composed of square heat insulating plates, thousands of square heat insulating plates are arranged and fixed outside the container case 106 .

The container main body 104 is fixed to the hull 102 by the support body 107 . The support body 107 is generally called a skirt and has a thermal break structure. The heat-resistant structure is, for example, a structure of stainless steel with low thermal conductivity inserted between an aluminum alloy and a low-temperature steel material, thereby enabling reduction of incoming heat.

Thus, in this embodiment, the spherical tank 101 is included as a heat insulating container, and the spherical tank 101 has the heat insulating structure 105 . As this heat insulating structure 105, the heat insulating structure 20 demonstrated in 1st Embodiment was used. Therefore, even if the heat-insulated container is exposed to a low-temperature environment due to holding a low-temperature substance below -40°C such as LNG, and is exposed to a high-temperature environment during maintenance, it can adequately cope with the heat generated by a large temperature difference. stress. Furthermore, the adhesiveness of the vacuum heat insulating material 10 in the heat insulation structure 20 can fully be ensured. Therefore, even in production applications such as holding LNG, the reliability of the thermal insulation performance can be further optimized.

(third embodiment)

In the above-mentioned second embodiment, the spherical tank 101 having the LNG transport tanker 100A shown in FIG. 5A and FIG. The present disclosure is not limited thereto.

In this embodiment, as a heat insulating container to which the heat insulating structure 20 is applied, as shown in FIGS. 6A and 6B , an LNG inboard tank 110 for LNG of a membrane system LNG transport tank ship 100B is exemplified and described.

As shown in FIG. 6A , the LNG transport tank ship 100B in this embodiment is a membrane system tank ship and has a plurality of inboard tanks 110 (four in total in FIG. 6A ). The plurality of inboard tanks 110 are arranged in a row along the longitudinal direction of the hull 111 . As shown in FIG. 6B , each inboard tank 110 serves as an internal space (substance holding space) for storing (holding) LNG. In addition, most of the inboard tanks 110 are externally supported by the hull 111 , and the upper part thereof is sealed by the deck 112 .

On the inner surface of the inboard tank 110 , as shown in FIG. 6B , a primary film 113 , a primary heat shield 114 , a secondary film 115 , and a secondary heat shield 116 are laminated in this order from the inside toward the outside. Thereby, a double "heat insulation tank structure" (or heat-proof structure) is formed on the inner surface of the inboard tank 110 . The "heat-insulating tank structure" as used herein means a structure composed of a layer (heat-insulating layer) of a heat-insulating material (heat-proof material) and a metal film. The inner "heat insulation tank structure" (primary heat protection structure) is formed by the primary film 113 and the primary heat insulation box 114, and the outer "heat insulation tank structure" is formed by the secondary film 115 and the secondary heat insulation box 116 (secondary heat protection structure).

The heat insulating layer is a layer that prevents (or suppresses) entry of heat from the outside of the inboard tank 110 into the interior space, and in this embodiment, the primary heat insulating box 114 and the secondary heat insulating box 116 are used. In other words, in this embodiment, the primary heat insulation box 114 and the secondary heat insulation box 116 function as a heat insulation structure. The primary heat insulation box 114 and the secondary heat insulation box 116 should just be comprised so that a heat insulating material may be accommodated in the inside of a heat insulation box, and the specific structure is not specifically limited. In this embodiment, for example, the primary heat insulation box 114 and the secondary heat insulation box 116 can be comprised as the structure (integrated heat insulation box) which integrated the some heat insulation box which accommodates a heat insulating material.

In each of the primary heat insulation box 114 and the secondary heat insulation box 116, a powder heat insulating material is accommodated, for example. As this powder heat insulating material, pearlite which is an inorganic foaming material is mentioned, for example, but the kind of powder heat insulating material is not limited to pearlite. For example, it may be a heat insulating material made of a foamed resin material such as styrene foam (foamed styrene), polyurethane foam, or phenolic foam, or it may be an inorganic fiber such as glass wool instead of a foamed material, or it may be Known heat insulating materials other than these. In the membrane system LNG transport tanker 100B, foams such as pearlite are generally used as powder heat insulating materials.

Moreover, the vacuum heat insulating material 10 demonstrated in 1st Embodiment is provided in the bottom surface of the secondary heat insulation box 116, although it is not shown in FIG. 6B. The vacuum heat insulating material 10 is a heat insulating material (heat insulating material excellent in heat insulating performance) whose thermal conductivity λ is lower than a powder heat insulating material. Therefore, by providing the vacuum heat insulating material 10 outside the secondary heat insulation box 116 located outside as a heat insulating layer, heat transfer from the outside can be suppressed or prevented, and internal cold and heat (cold air) can also be suppressed or prevented. Leak to the outside.

The powder heat insulation material accommodated in the secondary heat insulation box 116 can be used as the heat insulation board shape|molded in plate shape, not powder form as it is. According to this structure, the vacuum heat insulating material 10 can be attached to the outer surface of the heat insulation panel of a powder heat insulating material. Therefore, the heat insulation structure 20 demonstrated in 1st Embodiment can be applied to the secondary heat insulation box 116. FIG. Therefore, in this embodiment, the heat insulation structure 20 can be applied to the secondary heat insulation box 116 of the primary heat insulation box 114 and the secondary heat insulation box 116 which comprise a heat insulation structure.

The membrane functions as a "tank" for keeping LNG from leaking out in the internal space, and is used by covering it with a heat insulating material. In the present embodiment, the primary film 113 wrapped on (inside) the primary heat insulating box 114 and the secondary film 115 wrapped on (inside) the secondary heat insulating box 116 are used.

The primary film 113 constitutes the inner tank of the heat-insulating container, the secondary film 115 constitutes the middle tank of the heat-insulating container, and the hull 111 constitutes the outer tank of the heat-insulating container. The specific structures of the primary film 113 and the secondary film 115 are not particularly limited, but typical examples thereof include metal films such as stainless steel and Invar (nickel steel containing 36% nickel).

In addition, both the primary membrane 113 and the secondary membrane 115 are members that prevent LNG from leaking out, but do not have the strength to maintain the structural body of the inboard tank 110 . The structural body of the inboard tank 110 is supported by the hull 111 (and deck 112). In other words, leakage of LNG from the inboard tank 110 is prevented by the primary membrane 113 and the secondary membrane 115 , and the load of LNG is supported by the hull 111 via the primary heat shield box 114 and the secondary heat shield box 116 . Therefore, when the inboard tank 110 is regarded as a heat-insulating container, the hull 111 also becomes a "container shell" while being an outer tank.

Thus, in this embodiment, the inboard tank 110 is provided as a heat insulation container, and the inboard tank 110 has the heat insulation structure which consists of the primary heat insulation box 114 and the secondary heat insulation box 116. As shown in FIG. Among these heat insulating structures, the heat insulating structure 20 described in the first embodiment can be applied to the secondary heat insulating box 116 .

Therefore, even if the heat-insulated container is exposed to a low-temperature environment due to holding a low-temperature substance below -40°C such as LNG, and is exposed to a high-temperature environment during maintenance, it can adequately cope with the heat generated by a large temperature difference. stress, and can sufficiently secure the adhesiveness of the vacuum heat insulating material 10 in the heat insulating structure 20 . Therefore, even in production applications such as holding LNG, the reliability of the thermal insulation performance can be further optimized.

(fourth embodiment)

The heat-insulating container of the second embodiment or the third embodiment is the spherical tank 101 installed on the LNG transportation tanker 100A or the inboard tank 110 installed on the LNG transportation tanker 100B, but the present disclosure is not limited thereto. For example, It is an LNG tank installed on land. In this embodiment, such an LNG tank will be described with reference to FIGS. 7 and 8 .

In FIG. 7 , an above-ground LNG tank 120 is shown. The above-ground LNG tank 120 has a spherical container body 124 as the tank body similarly to the spherical tank 101 of the second embodiment, and the container body 124 is supported on the ground surface 50 by the support structure part 121 .

The support structure part 121 is comprised by the several support|pillar 122 provided in the vertical direction, and the brace 123 provided between the support|pillar 122 on the ground 50, but it is not specifically limited to this.

The container body 124 includes a container case 126 for holding a low-temperature substance, and a heat insulating structure 125 provided outside the container case 126 . The specific structures of the container case 126 and the heat insulating structure 125 are as described in the second embodiment or the third embodiment, and the heat insulating structure described in the first embodiment can be applied to the heat insulating structure 125 in particular. 20.

FIG. 8 illustrates an underground LNG tank 130 . The underground LNG tank 130 is provided with a cylindrical container body 134 inside a concrete structure 131 buried in the ground 50 . The container body 134 includes a container case 136 for holding a low-temperature substance, and a heat insulating structure 135 provided outside the container case 136 . The concrete structure 131 is made of, for example, prestressed concrete, and is installed in the ground so that most of it is located below the ground 50 . The concrete structure 131 is a structural support for supporting the tank body of the underground LNG tank 130 , and functions as a barrier to prevent leakage of LNG in case the tank body is damaged.

Moreover, the roof part 132 separate from the container main body 134 is provided in the upper opening of the container main body 134. As shown in FIG.

As an example, the upper surface of the roof part 132 is a convex curved surface, and the lower surface is a flat surface. On the outer side of the roof part 132, similarly to the container main body 134, the heat insulating structure 135 is provided, and the fibrous heat insulating material 133 is provided in the inside. As this fibrous heat insulating material 133, the inorganic fiber used as the core material 12 of the vacuum heat insulating material 10 is mentioned, for example.

The specific structures of the container case 136 and the heat insulating structure 135 are as described in the second embodiment or the third embodiment, and the heat insulating structure 20 described in the first embodiment can be applied to the heat insulating structure 135 .

As such, in this embodiment, the heat insulating container is the above-ground LNG tank 120 or the underground LNG tank 130, and these above-ground LNG tank 120 and the underground LNG tank 130 have heat-insulating structures 125 and 135, respectively. The heat insulating structure 20 described in the first embodiment can be applied to the thermal structures 125 and 135 .

Therefore, even if the heat-insulated container is exposed to low temperatures due to low-temperature substances below -40°C such as LNG, and exposed to high-temperature environments during maintenance, it can sufficiently cope with thermal stress caused by large temperature differences. Furthermore, the adhesiveness of the vacuum heat insulating material 10 in the heat insulation structure 20 can fully be ensured. Therefore, even in production applications such as holding LNG, the reliability of the thermal insulation performance can be further optimized.

(fifth embodiment)

In any of the second to fourth embodiments, the low-temperature substance held in the heat-insulating container is LNG, but the present disclosure is not limited thereto. As long as the heat-insulating structure 20 is exposed to temperatures below -40°C Only components used in low-temperature environments can be used.

For example, the thermally insulated container may be a container for holding a substance lower than LNG. In this embodiment, hydrogen gas is exemplified as such a lower temperature substance. An example of a hydrogen tank that liquefies and holds hydrogen gas will be specifically described with reference to FIG. 9 .

As shown in FIG. 9 , the hydrogen tank 140 of this embodiment is a container type, and basically has the same structure as the spherical tank 101 described in the second embodiment or the above-ground LNG tank 120 described in the fourth embodiment. .

The hydrogen tank 140 is provided with a container body 144 as a tank body inside a frame-shaped support body 141 . The container main body 144 includes a container case 146 for holding a low-temperature substance, and a heat insulating structure 145 provided outside the container case 146 .

The specific structures of the container case 146 and the heat insulating structure 145 are as described in the second to fourth embodiments, and the heat insulating structure 20 described in the first embodiment can be applied to the heat insulating structure 145 .

In general, liquefied hydrogen (liquid hydrogen) is an extremely low-temperature liquid at -253° C., and is about 10 times easier to vaporize than LNG. Therefore, for liquefied hydrogen, in order to obtain the same level of evaporation loss as LNG, it is necessary to further improve the heat insulating performance of the heat insulating material (low thermal conductivity).

In this embodiment, the heat insulation structure 145 which has the heat insulation structure 20 which can cope with a wide temperature range is used similarly to the structure demonstrated in 2nd - 4th embodiment. Therefore, with respect to the hydrogen tank 140 , it is possible to achieve more high heat insulation and further optimize the reliability of the heat insulation performance.

In addition, if the hydrogen tank 140 is a container type, it is conceivable that it will be placed in a place exposed to wind and rain, or transported in an environment exposed to wind and rain. In addition, the transport means is not limited to road transport means such as trucks and railways, but sea transport means such as ships are also conceivable. Therefore, the hydrogen tank 140 may be used in an environment exposed not only to rainwater but also to seawater.

Thus, in the present embodiment, the heat insulating container is the hydrogen tank 140 , and the hydrogen tank 140 has the heat insulating structure 145 , and the heat insulating structure 20 described in the first embodiment can be applied to the heat insulating structure 145 .

Therefore, even if the heat-insulated container is exposed to low temperature due to a low-temperature substance below -100°C such as liquefied hydrogen, and is exposed to a high-temperature environment during maintenance, it can sufficiently cope with thermal stress due to a large temperature difference . And the adhesiveness of the vacuum heat insulating material 10 in the heat insulation structure 20 can fully be ensured. Therefore, it is possible to further optimize the reliability of the thermal insulation performance in production applications such as holding liquefied hydrogen.

In addition, in the present disclosure, the low-temperature substance kept in the heat-insulated container is not limited to LNG or liquefied hydrogen, as long as it is a substance stored at a temperature lower than normal temperature (preferably having fluidity at a temperature lower than normal temperature by 100°C or higher). Sexual fluid) can be.

Taking the fluid as an example, fluids other than LNG and hydrogen include liquefied petroleum gas (LPG), other hydrocarbon gases, and combustible gases including these. Alternatively, among various compounds transported on a chemical tanker or the like, it may be a compound that needs to be stored at a temperature lower than normal temperature. Furthermore, the thermally insulated container to which the present disclosure can be applied may be a medical or industrial cryopreservation container or the like.

In addition, in the present disclosure, the normal temperature may be within the range of 20°C±5°C (within the range of 15°C to 25°C).

In addition, in the second embodiment to the fifth embodiment of the present disclosure, the heat insulating structure 20 of the present disclosure was described as an example of a heat insulating container holding a low-temperature substance below -40°C, but the present disclosure is not only applicable to It can be widely and suitably applied to a heat-insulating structure used in an environment exposed to a low temperature of -40° C. or lower as a heat-insulating container for holding a low-temperature substance.

In addition, the present disclosure is not limited to the description of each embodiment, and various changes can be made within the range shown in the scope of claims, and it is an implementation obtained by appropriately combining technical solutions disclosed in different embodiments and a plurality of modified examples. The method is also included in the technical scope of the present disclosure.

Industrial Utilization Possibility

As mentioned above, according to this indication, in order to be applicable to the product for production, in the heat insulation structure using a vacuum heat insulating material, the outstanding effect of making the reliability of heat insulation performance more suitable can be exhibited. Therefore, it can be widely and suitably used in fields such as a heat insulating structure used in an environment exposed to a low temperature of -40° C. or lower, and a heat insulating container using the heat insulating structure, and has practicality.

Explanation of reference signs

10 vacuum insulation

10a front

10b back

10c side

10d Outer side

11 Covering material

12 core material

13 Adsorbent

14 Sealing part

15 adhesive

16, 17 Filling material

18 fill insulation

20 Insulation structure

30 other parts

50 ground

100A LNG transfer tanker

100B LNG transfer tanker

101 spherical tank

102 Hull

103 cover

104 container body

105 Insulation structure

106 container shell

107 support body

110 Inboard tanks

111 Hull

112 decks

113 primary film

114 primary insulation box

115 secondary film

116 secondary insulation box

120 above ground LNG tank

121 Support structure body

122 pillars

123 Supports

124 container body

125 Insulation structure

126 container shell

130 underground LNG tank

131 Concrete structures

132 roof section

133 Fibrous insulation

134 container body

135 Insulation structure

136 Container shell

140 hydrogen tank

141 support body

144 container body

145 Insulation structure

146 Container shell

151 First adhesive

152 Second adhesive.

Claims (12)

1. a kind of heat insulating structure body can be used in the environment of being exposed to -40 DEG C of low temperature below, vacuum is included at least Thermal insulation barriers and other component, the heat insulating structure body are characterized in that:

The Vacuumed insulation panel includes overcoating material and to depressurize the core material that air-tight state is sealing into the inside of the overcoating material,

When using the surface in outside in the surface of the overcoating material, as the Vacuumed insulation panel as when outer surface, The outer surface includes wetted surface area, and the wetted surface area, which has been assigned, shows wetability more than the surface The surface state of intrinsic wetability,

The Vacuumed insulation panel is configured to the wetted surface area is across elastic material and the other component or other are true Empty thermal insulation barriers are adjacent.

2. heat insulating structure body as described in claim 1, it is characterised in that:

The wetted surface area is constituted by implementing surface treatment or resinous coat to the outer surface.

3. heat insulating structure body as claimed in claim 1 or 2, it is characterised in that:

The wetted surface area be endowed in the outer surface, described Vacuumed insulation panel at least as the area at the back side Domain,

The Vacuumed insulation panel be configured to by locally applying the bonding agent as the elastic material at the back side with The other component is pasted together.

4. heat insulating structure body as claimed in claim 3, it is characterised in that:

The bonding agent include at normal temperatures the first bonding agents with adhesiveness and under the low temperature with higher than described the The second bonding agents of the adhesiveness of one bonding agent,

The first bonding agents and the second bonding agents are respectively applied at the back side in mutually different part.

5. heat insulating structure body as claimed in claim 4, it is characterised in that:

The first bonding agents and the second bonding agents are alternately coated on the back side.

6. heat insulating structure body as described in claim 4 or 5, it is characterised in that:

The first bonding agents and the second bonding agents are more than institute at the back side with the area of application of the first bonding agents The big mode of the area of application for stating second bonding agents applies.

7. the heat insulating structure body as described in any one of claim 4~6, it is characterised in that:

The first bonding agents are hot-melt adhesive, and the second bonding agents are response type bonding agent.

8. the heat insulating structure body as described in any one of claim 3~7, it is characterised in that:

The peel strength of the bonding agent is 25mm wide 13N or more.

9. the heat insulating structure body as described in any one of claim 3~8, it is characterised in that:

The Vacuumed insulation panel includes multiple Vacuumed insulation panels,

The wetted surface area be formed in the outer surface, described Vacuumed insulation panel at least as the side surface in outside Region,

Gap in the multiple Vacuumed insulation panel, between be formed in the Vacuumed insulation panel being adjacent to it is at least outer Side, filled with the packing material as the elastic material.

10. heat insulating structure body as claimed in claim 9, it is characterised in that:

The packing material is made of heat-curing resin elastomeric material.

11. heat insulating structure body as claimed in claim 2, it is characterised in that:

It is described surface treatment be sided corona treatment, ozone treatment or corona treatment,

The resinous coat is polyurethane coating or silicon coating.

12. a kind of heat-insulated container, it is characterised in that:

Including the heat insulating structure body described in any one of claim 1~11.