JP2011236986A - Vacuum heat insulating material, mounting structure thereof and house having them - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce deterioration of heat insulating performance while suppressing an increase of manufacturing cost.SOLUTION: A vacuum heat insulating material includes: a core part 110 containing a void and having a heat insulating action; a buffer part 210 containing the void with a void ratio larger than that of the core part 110, arranged adjacent to the core part 110, which maintains a degree of vacuum; and an outer cover part 120 for surrounding and vacuum-sealing the core part 110 and the buffer part 210.

Description

  The present invention relates to a vacuum heat insulating material, its mounting structure, and a house having them.

  When the vacuum degree inside the vacuum heat insulating material is lowered, the heat insulating performance is lowered. The conventional vacuum heat insulating material is provided with an adsorbent in order to maintain the degree of vacuum inside. There exists patent document 1 as a prior art document which disclosed the vacuum heat insulating material provided with adsorbent.

  In the vacuum heat insulating material described in Patent Document 1, activated carbon substituted with a hardly adsorbing gas and a zeolite-based adsorbent are vacuum packaged in a plastic container or a plastic / metal laminate film.

JP-A-61-119894

  In the vacuum heat insulating material provided with the adsorbent, the adsorbent itself is expensive, and the manufacturing conditions for vacuum-sealing the core of the vacuum heat insulating material and the adsorbent become severe. Specifically, the adsorbent and the core must be vacuum-sealed while suppressing adsorption of moisture, oxygen and nitrogen in the air to the adsorbent.

  This invention is made | formed in view of said problem, Comprising: The vacuum heat insulating material which can reduce the fall of heat insulation performance, suppressing the increase in manufacturing cost, its attachment structure, and a house which has them The purpose is to provide.

  The vacuum heat insulating material based on this invention is a buffer part for maintaining the vacuum degree provided including the space | interval which contains the space | gap and has a heat insulation effect | action, and the space | gap of a larger porosity than a core part, and was provided adjacent to the core part And an outer packet part which surrounds the core part and the buffer part and is vacuum-sealed.

Preferably, the average density of the buffer part is smaller than the average density of the core part.
In one form of the vacuum heat insulating material based on this invention, a buffer part has a porous structure.

In one embodiment of the vacuum heat insulating material according to the present invention, the buffer portion has a honeycomb structure.
In one form of the vacuum heat insulating material based on this invention, a buffer part has a hollow body structure.

Preferably, the porosity of the buffer portion is 90% or more.
In the attachment structure of the vacuum heat insulating material for attaching the vacuum heat insulating material according to any one of the above, the attached portion to which the vacuum heat insulating material is attached has a concave portion or a convex portion. The buffer portion has a convex portion having a shape corresponding to the concave portion of the attached portion or a concave portion having a shape corresponding to the convex portion of the attached portion. The concave portion of the attached portion and the convex portion of the buffer portion or the convex portion of the attached portion and the concave portion of the buffer portion are combined and attached with the outer packet portion interposed therebetween.

  ADVANTAGE OF THE INVENTION According to this invention, the fall of the heat insulation performance of a vacuum heat insulating material can be reduced.

It is sectional drawing which shows the structure of the vacuum heat insulating material illustrated in order to demonstrate the vacuum heat insulating material of this invention. It is sectional drawing which shows the structure of the vacuum heat insulating material which concerns on Embodiment 1 of this invention. It is sectional drawing which shows the structure of the vacuum heat insulating material of the 1st modification concerning the embodiment. It is sectional drawing which shows typically the dispersion state of the gas which permeated into the vacuum heat insulating material which concerns on the same embodiment. It is a graph which shows the change of the heat insulation performance with the vacuum heat insulating material which provided the buffer part, and the vacuum heat insulating material which provided the buffer part. It is sectional drawing which shows the structure of the vacuum heat insulating material of the 2nd modification which concerns on this embodiment. It is sectional drawing which shows the structure of the vacuum heat insulating material of the 3rd modification which concerns on this embodiment. It is sectional drawing which shows the structure of the vacuum heat insulating material of the 4th modification which concerns on this embodiment. It is sectional drawing which shows the structure of the vacuum heat insulating material of the 5th modification based on this embodiment. It is a graph which shows the relationship between the porosity of a buffer part, and the pressure inside a vacuum heat insulating material. It is sectional drawing which shows the attachment structure of the vacuum heat insulating material of a 1st comparative example. It is sectional drawing which shows the attachment structure of the vacuum heat insulating material of a 2nd comparative example. It is sectional drawing which shows the attachment structure of the vacuum heat insulating material which concerns on Embodiment 2 of this invention. It is sectional drawing which shows the house which has the vacuum heat insulating material of a 1st comparative example. It is sectional drawing which shows the house which has the vacuum heat insulating material of a 2nd comparative example. It is sectional drawing which shows the house which has the vacuum heat insulating material which concerns on Embodiment 3 of this invention. It is a graph which shows a time-dependent change of the heat insulation performance of the house of said comparative example, and the house of this embodiment.

Hereinafter, the vacuum heat insulating material in Embodiment 1 based on this invention is demonstrated with reference to figures. In the following description of the embodiments, the same or corresponding parts in the drawings are denoted by the same reference numerals, and the description thereof will not be repeated.
Embodiment 1
FIG. 1 is a cross-sectional view showing a configuration of a vacuum heat insulating material exemplified for explaining the vacuum heat insulating material of the present invention. As shown in FIG. 1, the vacuum heat insulating material 100 includes a core part 110 and an outer packet part 120 that surrounds the core part 110 and is vacuum-sealed. The core part 110 has a space. The outer packet part 120 has confidentiality and suppresses gas such as air from entering the vacuum heat insulating material 100. However, since it is not possible to completely prevent the gas from entering, the gas penetrates the outer packet part 120 with the passage of time and enters the inside of the vacuum heat insulating material 100. As the degree of vacuum in the vacuum heat insulating material 100 decreases, the heat insulating property of the vacuum heat insulating material 100 decreases.

Here, the relationship between the change in the degree of vacuum of the vacuum heat insulating material 100 and the volume of the vacuum heat insulating material 100 will be considered. Let X ₀ (mol) be the number of moles of gas contained in the vacuum heat insulating material 100 immediately after manufacture. Let P ₀ (Torr) be the pressure inside the vacuum heat insulating material 100 immediately after manufacture. Let X ₁ (mol) be the number of moles of gas that has penetrated into the vacuum heat insulating material 100 until one year has passed after the production. Let P ₁ (Torr) be the pressure inside the vacuum heat insulating material 100 after one year has passed since manufacture. The gas constant is R (L · Torr · K ⁻¹ · mol ⁻¹ ), and the temperature inside the vacuum heat insulating material 100 is T (K). Let V (L) be the volume of the voids contained in the vacuum heat insulating material 100.

  In the vacuum heat insulating material 100 immediately after manufacturing, the relationship of the following formula (1) is established.

P ₀ V = X ₀ RT (1)
The relationship of the following formula (2) is established in the vacuum heat insulating material 100 after one year has passed since the manufacture.

P ₁ V = (X ₀ + X ₁ ) RT (2)
From the formulas (1) and (2), P ₁ / P ₀ = (X ₀ + X ₁ ) / X ₀ , and the following formula (3) is derived.

P ₁ = P ₀ + X ₁ RT / V (3)
As can be seen from Equation (3), P ₁ can be reduced by reducing X ₁ / V. The present inventor has found that the pressure increase inside the vacuum heat insulating material can be suppressed by increasing the volume V of the void contained inside the vacuum heat insulating material. In other words, by increasing in a large proportion compared to V to X _1, to reduce the X ₁ / V. As a result, P ₁ can be reduced. The vacuum heat insulating material according to the present embodiment has the following configuration in order to satisfy the above relationship.

  FIG. 2 is a cross-sectional view showing the configuration of the vacuum heat insulating material according to Embodiment 1 of the present invention. As shown in FIG. 2, the vacuum heat insulating material 200 which concerns on Embodiment 1 of this invention has the core part 110 which contains a space | gap and has a heat insulation effect. Adjacent to the upper part of the core part 110, a buffer part 210 is provided for maintaining a degree of vacuum including a void having a larger porosity than the core part 110. The core part 110 and the buffer part 210 are surrounded by the outer packet part 120 and hermetically sealed.

  With the above configuration, the volume V of the voids included in the vacuum heat insulating material 200 can be increased. On the other hand, the amount of gas that penetrates into the vacuum heat insulating material 200 increases as the surface area of the outer packet part 120 increases, but the rate of increase in gas penetration is very small compared to the rate of increase in the volume V of the air gap. .

  For example, when the outer packet part 120 is formed of a laminated film having a two-layer structure of polyethylene and aluminum foil, the seal part 240 of the outer packet part 120 shown in FIG. 2 is welded with polyethylene, and the polyethylene is exposed to the outside. ing. The outer surface of the outer packet part 120 other than the seal part 240 is covered with aluminum foil. Since the moisture permeation coefficient of moisture, oxygen, and nitrogen is extremely small for aluminum foil as compared with polyethylene, the penetration of gas into the vacuum heat insulating material 200 is predominantly due to gas permeation from the seal portion 240. Become.

Therefore, even when the surface area of the outer packet part 120 is increased by increasing the volume V of the voids included in the vacuum heat insulating material 200, the gas that enters the outer packet part 120 is gas that has permeated the seal part 240. However, the amount of gas penetration hardly increases. Thus, by increasing the volume of the voids included in the vacuum heat insulating material 200, the above-mentioned X ₁ / V can be reduced, so that P ₁ can be reduced.

  FIG. 3 is a cross-sectional view showing the configuration of the vacuum heat insulating material of the first modification according to the present embodiment. As shown in FIG. 3, in the vacuum heat insulating material 220 of the first modified example, the buffer part 210 is provided adjacent to the end part of the core part 110. About another structure, it is the same as that of the vacuum heat insulating material 200. FIG. The arrangement of the buffer unit 210 is not particularly limited as long as it is connected to the core unit 110.

  FIG. 4 is a cross-sectional view schematically showing a dispersed state of the gas that has entered the vacuum heat insulating material according to the present embodiment. As shown in FIG. 4, the gas 230 that has entered the inside of the vacuum heat insulating material 200 is dispersed in both the core part 110 and the buffer part 210. As described above, since the core 110 has the heat insulating performance of the vacuum heat insulating material 200, when the gas 230 enters the core 110, the degree of vacuum inside the vacuum heat insulating material 200 decreases due to the pressure of the gas 230. As a result, the heat insulation performance decreases.

  In the vacuum heat insulating material 200 of the present embodiment, the gas 230 that has entered the inside is dispersed in both the buffer part 210 and the core part 110, so that the pressure of the gas 230 in the core part 110 can be reduced. Therefore, it is possible to suppress a decrease in the heat insulating performance of the vacuum heat insulating material 200.

  FIG. 5 is a graph showing a change in heat insulation performance between a vacuum heat insulating material not provided with a buffer part and a vacuum heat insulating material provided with a buffer part. In FIG. 5, the vertical axis represents the thermal conductivity of the vacuum heat insulating material, and the horizontal axis represents the pressure inside the vacuum heat insulating material. Moreover, in FIG. 5, the data of the vacuum heat insulating material which concerns on this embodiment with the continuous line, and the data of the vacuum heat insulating material which does not provide the buffer part with the dotted line are shown.

  As shown in FIG. 5, the pressure inside the vacuum heat insulating material immediately after manufacture is 0.1 (Torr) for both the vacuum heat insulating material not provided with the buffer part and the vacuum heat insulating material of this embodiment, and the thermal conductivity. Is equivalent.

  In the pressure inside the vacuum heat insulating material after the elapse of a predetermined period after manufacture, the vacuum heat insulating material not provided with the buffer portion is 10 times or more larger than the vacuum heat insulating material of the present embodiment. In terms of thermal conductivity, the vacuum heat insulating material not provided with the buffer portion is increased by about twice as compared with the vacuum heat insulating material of the present embodiment.

  As can be seen from the above results, the vacuum heat insulating material according to the present embodiment is provided with a buffer portion, so that a decrease in the degree of vacuum is suppressed compared to a vacuum heat insulating material without a buffer portion. Yes. As a result, in the vacuum heat insulating material according to the present embodiment, a decrease in heat insulating performance is suppressed as compared with a vacuum heat insulating material in which a buffer part is not provided.

  In the vacuum heat insulating material according to the present embodiment, a woven fabric made of glass fiber is used as the core portion 110. As the core part 110, for example, a non-woven fabric made of glass fiber, a continuous urethane foam, or a structure having voids such as a metal, resin, or inorganic honeycomb structure can be used.

  Further, as the buffer unit 210, various structures including voids can be used. Preferably, the average density of the buffer part 210 is smaller than the average density of the core part 110. By doing in this way, weight reduction of the vacuum heat insulating material 200 can be achieved. Preferably, the porosity of the buffer unit 210 is 90% or more. By doing in this way, the volume of the buffer part 210 whole can be made small, ensuring the volume of a space | gap. Therefore, the vacuum heat insulating material 200 can be made compact.

In this embodiment, the buffer part 210 was formed using the communication urethane foam. The density of the glass fiber forming the core part 110 is 210 kg / m ³ , whereas the density of the continuous urethane foam used is 60 kg / m ³ . When the density of the continuous urethane foam is less than 60 kg / m ³ , the buffer unit 210 is deformed by an external force due to atmospheric pressure, which is not preferable.

Further, since the true specific gravity of the resin constituting the continuous urethane foam is about 1000 kg / m ³ , the porosity of the continuous urethane foam having a density of 60 kg / m ³ is about 94%. Therefore, the buffer part 210 using the communication urethane foam satisfies the above-mentioned conditions as a preferable buffer part.

  FIG. 6 is a cross-sectional view showing the configuration of the vacuum heat insulating material of the second modified example according to the present embodiment. As shown in FIG. 6, in the vacuum heat insulating material 300 of the second modified example, the buffer portion 310 is formed of a honeycomb structure. About another structure, it is the same as that of the vacuum heat insulating material 200. FIG.

  As a material for the honeycomb structure, a metal, a resin, or an inorganic substance can be used. In the buffer part 310 made of the honeycomb structure, the porosity can be increased as the strength material is used. This is because, in a material having low strength, the thickness of the hexagonal portion of the honeycomb structure is increased in order to ensure the strength, so that the volume occupied by the voids is reduced.

  However, when the honeycomb structure is used as the buffer part 310, a protective part made of metal or the like is provided between the buffer part 310 and the outer packet part 120 so that the end of the honeycomb structure does not damage the outer packet part 120. It is preferable to provide it.

  FIG. 7 is a cross-sectional view showing the configuration of the vacuum heat insulating material of the third modified example according to the present embodiment. As shown in FIG. 7, in the vacuum heat insulating material 320 of the third modified example, the buffer part 330 is formed of a porous structure. About another structure, it is the same as that of the vacuum heat insulating material 200. FIG.

As a material of the buffer part 330 made of a porous structure, an organic substance or an inorganic substance can be used. When a porous structure is formed using an organic material, a relatively lightweight structure can be formed, but heat resistance is relatively low. On the other hand, when a porous structure is formed using an inorganic material, the heat resistance of the structure is increased, but handling becomes difficult when the inorganic material is a powder. For example, the density of the buffer unit 330 made of an inorganic powder such as Aerosil (registered trademark) is 210 kg / m ³ and the porosity is 90%.

For example, the density of the buffer part 330 made of an organic substance such as a polystyrene porous body or a polyethylene porous body is 210 kg / m ³ or less, and the porosity is 90% or more. Therefore, the buffer part 330 made of these organic substances satisfies the above-mentioned conditions as a preferable buffer part.

The porosity of the organic porous material can be calculated from the following equation.
Porosity = 1- Apparent specific gravity (specific gravity of porous body) / true specific gravity (specific gravity of resin part of porous body)
The true specific gravity of the polystyrene resin part was 1.04, and the true specific gravity of the polyethylene resin part was 0.96.

  FIG. 8 is a cross-sectional view showing the configuration of the vacuum heat insulating material of the fourth modified example according to the present embodiment. As shown in FIG. 8, in the vacuum heat insulating material 340 of the fourth modified example, the buffer unit 350 is formed of a hollow body structure. About another structure, it is the same as that of the vacuum heat insulating material 200. FIG.

  Since the hollow body structure has a hollow shell structure, the hollow body structure needs to have a thickness that does not deform due to an external force due to atmospheric pressure, but has a porosity of 90% or more. The shell structure portion has air permeability between the hollow portion inside and the outside. As a material of the buffer part 350 made of a hollow body structure, a metal, a resin, an inorganic substance, or the like can be used.

  FIG. 9 is a cross-sectional view showing the configuration of the vacuum heat insulating material of the fifth modified example according to the present embodiment. As shown in FIG. 9, in the vacuum heat insulating material 400 of the fifth modified example, space supports 410 are provided on the peripheral side and the bottom in the vacuum heat insulating material 400. The core part 110 is arrange | positioned so that it may be surrounded by the space support body 410. FIG. Since the thickness of the core part 110 is lower than the thickness of the space support 410 arranged on the peripheral side part, a space is formed between the outer packet part 120 and the core part 110. The outer packet part 120 in contact with the space by an external force due to atmospheric pressure is deformed to the inside of the vacuum heat insulating material 400. The space formed using the space support 410 has a function of maintaining the degree of vacuum of the core 110 as the buffer 420.

  FIG. 10 is a graph showing the relationship between the porosity of the buffer portion and the pressure inside the vacuum heat insulating material. In FIG. 10, the vertical axis represents the pressure inside the vacuum heat insulating material, and the horizontal axis represents the permeation amount of gas (gas) penetrating into the vacuum heat insulating material. In addition, data with a porosity of 94% is a solid line, data with a porosity of 90% is a small dotted line, data with a porosity of 70% is a one-dot chain line, data with a porosity of 50% is a two-dot chain line, and data with a porosity of 0% is large. Shown with dotted lines. Further, the dimensions of the core part were 182 cm in length, 91 cm in width, and 1 cm in thickness, and the dimensions of the buffer part were 182 cm in length, 91 cm in width, and 2 cm in thickness.

  As shown in FIG. 10, as the porosity of the buffer portion increases, the slope of the straight line decreases. This indicates that the rate of increase in pressure inside the vacuum heat insulating material with respect to the amount of gas permeated into the vacuum heat insulating material decreases as the porosity of the buffer portion increases. In other words, it shows that the degree of vacuum of the vacuum heat insulating material is maintained as the porosity of the buffer portion increases.

  As described above, in the vacuum heat insulating material provided with the buffer portion, by increasing the volume of the voids included in the vacuum heat insulating material, the pressure increase in the vacuum heat insulating material is suppressed, and the heat insulating performance is changed over time. Reduction can be suppressed.

Hereinafter, the attachment structure of the vacuum heat insulating material in Embodiment 2 based on this invention is demonstrated with reference to figures.
Embodiment 2
FIG. 11 is a cross-sectional view showing the attachment structure of the vacuum heat insulating material of the first comparative example. As shown in FIG. 11, a recessed portion 510 is formed in the attached portion 500 to which the vacuum heat insulating material 100 is attached. In this case, if the external shape of the vacuum heat insulating material 100 does not correspond to the shape of the recess 510, the vacuum heat insulating material 100 could not be stably attached to the attached portion 500.

  FIG. 12 is a cross-sectional view showing a vacuum heat insulating material mounting structure of a second comparative example. As shown in FIG. 12, in the vacuum heat insulating material mounting structure of the second comparative example, when the recessed portion 510 is formed in the mounted portion 500, the mounting member 530 corresponding to the shape of the recessed portion 510 is used. The vacuum heat insulating material 100 is attached.

  Specifically, a convex portion corresponding to the concave portion 510 is formed on one surface of the attachment member 530, and an adhesive member 520 is applied to the convex portion to attach the attached portion 500 and the attachment member 530. Yes. Further, the adhesive member 540 is applied to the other surface of the attachment member 530 to attach the vacuum heat insulating material 100 and the attachment member 530. As a result, the to-be-attached part 500 and the vacuum heat insulating material 100 are attached.

  FIG. 13: is sectional drawing which shows the attachment structure of the vacuum heat insulating material which concerns on Embodiment 2 of this invention. As shown in FIG. 13, in the attachment structure of the vacuum heat insulating material according to Embodiment 2 of the present invention, a recessed portion 510 is formed in the attached portion 500 to which the vacuum heat insulating material 600 is attached.

  The vacuum heat insulating material 600 includes a gap 110 and a core portion 110 having a heat insulating action. Adjacent to the upper portion of the core portion 110, a buffer portion 610 for maintaining a degree of vacuum including a void having a larger porosity than the core portion 110 is provided. The buffer portion 610 has a convex portion 630 having a shape corresponding to the concave portion 510 of the attached portion 500. An outer packet part 620 surrounds the core part 110 and the buffer part 610 and is vacuum-sealed.

  A convex portion 640 that follows the convex portion 630 is formed on the outer packet portion 620 that is in contact with the convex portion 630. The convex portion 640 and the concave portion 510 are joined by an adhesive member 520 applied to the attached portion 500. As a result, the concave portion 510 of the attached portion 500 and the convex portion 630 of the buffer portion 610 are assembled and attached with the outer packet portion 620 interposed therebetween.

  In addition, in this embodiment, although the recessed part 510 is formed in the to-be-attached part 500, the convex part may be formed. In this case, a concave portion corresponding to the convex portion is formed in the buffer portion 610. And the convex part of the to-be-attached part 500 and the recessed part of the buffer part 610 are combined and attached on both sides of the outer packet part 620.

  With the above configuration, the vacuum heat insulating material can be stably attached regardless of the shape of the attached member. Further, since no mounting member as in the comparative example is used, the number of parts and the number of mounting work steps can be reduced, and the cost can be reduced.

  For example, when the buffer portion 610 is formed using a foamed resin, the shape processing of the buffer portion 610 is easy, which is suitable for application of the present embodiment. The other configuration of the vacuum heat insulating material is the same as that of the first embodiment, and therefore description thereof will not be repeated.

Hereinafter, the vacuum heat insulating material in Embodiment 3 based on this invention and the house which has the attachment structure are demonstrated with reference to figures.
Embodiment 3
FIG. 14 is a cross-sectional view showing a house having the vacuum heat insulating material of the first comparative example. As shown in FIG. 14, in the house having the vacuum heat insulating material of the first comparative example, the vacuum heat insulating material 100 is arranged on the wall portion 710 of the house 700.

In the vacuum heat insulating material 100, the density of the core 110 was 210 kg / m ³ , the length was 182 cm, the width was 91 cm, and the thickness was 1 cm. The thickness of the vacuum heat insulating material 100 was L _1. At this time, the weight of the vacuum heat insulating material was 3.48 kg / tatami size.

  In a house having the above-described vacuum heat insulating material 100, since the time-dependent change in the heat insulating performance of the vacuum heat insulating material is large, the heat loss (heat loss) of the house increases with time.

  FIG. 15: is sectional drawing which shows the house which has the vacuum heat insulating material of a 2nd comparative example. As shown in FIG. 15, in the house having the vacuum heat insulating material of the second comparative example, the vacuum heat insulating material 130 is arranged on the wall portion 710 of the house 700.

In the vacuum heat insulating material 130, the density of the core 110 was 210 kg / m ³ , the length was 182 cm, the width was 91 cm, and the thickness was 3 cm. The thickness of the vacuum heat insulating material 130 is L _2, a L _2> L _1. At this time, the weight of the vacuum heat insulating material was 10.4 kg / tatami size.

  In the house having the above-described vacuum heat insulating material 130, since the thickness of the vacuum heat insulating material is increased in anticipation of the temporal change of the heat insulating performance of the vacuum heat insulating material, as compared with the house of the first comparative example, The heat loss can be reduced.

  However, since the weight of the vacuum heat insulating material 130 is greatly increased, it is necessary to increase the strength of a structure such as a frame of a house, which increases the cost of parts and the burden of assembly work.

  FIG. 16: is sectional drawing which shows the house which has the vacuum heat insulating material which concerns on Embodiment 3 of this invention. As shown in FIG. 16, in the house having the vacuum heat insulating material according to Embodiment 3 of the present invention, the vacuum heat insulating material 800 is arranged on the wall portion 710 of the house 700.

In the vacuum heat insulating material 800, the density of the core portion 110 was 210 kg / m ³ , the length was 182 cm, the width was 91 cm, and the thickness was 1 cm. Further, in the vacuum heat insulating material 800, the density of the buffer portion 810 was 60 kg / m ³ , the length was 182 cm, the width was 91 cm, and the thickness was 2 cm. The thickness of the vacuum heat insulating material 800 is L _3, a _{L 2> L 3> L 1} . At this time, the weight of the vacuum heat insulating material was about 5.47 kg / tatami size.

  In a house having the vacuum heat insulating material 800 described above, it is possible to suppress a decrease in heat insulation performance with time while suppressing an increase in the weight of the vacuum heat insulating material, thereby reducing heat loss as a house.

  FIG. 17 is a graph showing temporal changes in the heat insulation performance of the house of the comparative example and the house of the present embodiment. In FIG. 17, the vertical axis indicates the heat insulation performance of the house, and the horizontal axis indicates the elapsed time. Moreover, the data of the house which concerns on this embodiment are shown as the continuous line, the data of the house of the 1st comparative example are shown with a dotted line, and the data of the 2nd comparative example are shown with the dashed-two dotted line.

  As shown in FIG. 17, immediately after the assembly of the house, the heat insulation performance of the house of this embodiment is equivalent to that of the first comparative example, and the heat insulation performance of the second comparative example is the highest. After a predetermined time has elapsed, the heat insulation performance of the house of this embodiment and the house of the second comparative example are substantially equal, and the heat insulation performance of the house of the first comparative example is greatly reduced.

  As described above, the heat insulation performance of the house having the vacuum heat insulating material of the present embodiment or the mounting structure of the vacuum heat insulating material is suppressed from decreasing with time. Therefore, heat loss as a house can be suppressed for a relatively long time.

  In the house which concerns on this embodiment, although the vacuum heat insulating material has been arrange | positioned in the wall part 710 of the house 700, you may arrange | position on the floor part of a house, or a ceiling top. Since the other structure of the vacuum heat insulating material 800 is the same as that of the first or second embodiment, the description thereof will not be repeated.

  In addition, the said embodiment disclosed this time is an illustration in all the points, Comprising: It does not become a basis of limited interpretation. Therefore, the technical scope of the present invention is not interpreted only by the above-described embodiments, but is defined based on the description of the scope of claims. Further, all modifications within the meaning and scope equivalent to the scope of the claims are included.

  100, 130, 200, 220, 300, 320, 340, 400, 600, 800 Vacuum heat insulating material, 110 core portion, 120, 620 outer packaging portion, 210, 310, 330, 350, 420, 610, 810 buffer portion, 230 Gas, 240 Sealing part, 410 Spatial support, 500 Mounting part, 510 Recessed part, 520,540 Adhesive member, 530 Mounting member, 630,640 Convex part, 700 House, 710 Wall part.

Claims (9)

A core portion including a void and having a heat insulating action;
A buffer part for maintaining the degree of vacuum provided adjacent to the core part, including a void having a larger porosity than the core part;
A vacuum heat insulating material, comprising: an outer envelope portion that surrounds the core portion and the buffer portion and is vacuum-sealed.   The vacuum heat insulating material according to claim 1, wherein an average density of the buffer portion is smaller than an average density of the core portion.   The vacuum heat insulating material according to claim 1, wherein the buffer portion has a porous structure.   The vacuum heat insulating material according to claim 1, wherein the buffer portion has a honeycomb structure.   The vacuum heat insulating material according to claim 1, wherein the buffer portion has a hollow body structure.   The vacuum heat insulating material in any one of Claim 1 to 5 whose porosity of the said buffer part is 90% or more. A vacuum heat insulating material mounting structure for mounting the vacuum heat insulating material according to claim 1,
The attached portion to which the vacuum heat insulating material is attached has a concave portion or a convex portion,
The buffer portion has a convex portion having a shape corresponding to the concave portion of the attached portion, or a concave portion having a shape corresponding to the convex portion of the attached portion,
The concave portion of the attached portion and the convex portion of the buffer portion, or the convex portion of the attached portion and the concave portion of the buffer portion are combined and attached with the outer packet portion interposed therebetween, Vacuum insulation mounting structure.   The house provided with the vacuum heat insulating material in any one of Claim 1 to 6.   The house which has the attachment structure of the vacuum heat insulating material of Claim 7.

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