WO2018043712A1 - 真空断熱パネル - Google Patents
真空断熱パネル Download PDFInfo
- Publication number
- WO2018043712A1 WO2018043712A1 PCT/JP2017/031619 JP2017031619W WO2018043712A1 WO 2018043712 A1 WO2018043712 A1 WO 2018043712A1 JP 2017031619 W JP2017031619 W JP 2017031619W WO 2018043712 A1 WO2018043712 A1 WO 2018043712A1
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- WO
- WIPO (PCT)
- Prior art keywords
- vacuum
- insulation panel
- core material
- outer packaging
- packaging material
- Prior art date
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- 238000009413 insulation Methods 0.000 title claims abstract description 79
- 239000011162 core material Substances 0.000 claims abstract description 55
- 238000003466 welding Methods 0.000 claims abstract description 41
- 239000005022 packaging material Substances 0.000 claims abstract description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 20
- 230000002093 peripheral effect Effects 0.000 claims abstract description 19
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 17
- 239000010935 stainless steel Substances 0.000 claims abstract description 17
- 230000003746 surface roughness Effects 0.000 claims abstract description 16
- 239000012784 inorganic fiber Substances 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 claims description 11
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 20
- 238000000034 method Methods 0.000 abstract description 18
- 230000008569 process Effects 0.000 description 12
- 238000007789 sealing Methods 0.000 description 8
- 230000008859 change Effects 0.000 description 7
- 230000007613 environmental effect Effects 0.000 description 6
- 239000011888 foil Substances 0.000 description 5
- 239000003463 adsorbent Substances 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- 230000005611 electricity Effects 0.000 description 4
- 239000011491 glass wool Substances 0.000 description 4
- 238000009863 impact test Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 230000037303 wrinkles Effects 0.000 description 3
- 235000013361 beverage Nutrition 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000011835 investigation Methods 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 239000012466 permeate Substances 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 239000011257 shell material Substances 0.000 description 2
- 230000036962 time dependent Effects 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- ZTXONRUJVYXVTJ-UHFFFAOYSA-N chromium copper Chemical compound [Cr][Cu][Cr] ZTXONRUJVYXVTJ-UHFFFAOYSA-N 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000005443 coulometric titration Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 239000002648 laminated material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 238000010943 off-gassing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
- 210000002268 wool Anatomy 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L59/00—Thermal insulation in general
- F16L59/06—Arrangements using an air layer or vacuum
- F16L59/07—Arrangements using an air layer or vacuum the air layer being enclosed by one or more layers of insulation
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
- E04B1/76—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to heat only
- E04B1/78—Heat insulating elements
- E04B1/80—Heat insulating elements slab-shaped
- E04B1/803—Heat insulating elements slab-shaped with vacuum spaces included in the slab
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L59/00—Thermal insulation in general
- F16L59/06—Arrangements using an air layer or vacuum
- F16L59/065—Arrangements using an air layer or vacuum using vacuum
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R13/00—Elements for body-finishing, identifying, or decorating; Arrangements or adaptations for advertising purposes
- B60R13/08—Insulating elements, e.g. for sound insulation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L59/00—Thermal insulation in general
- F16L59/08—Means for preventing radiation, e.g. with metal foil
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/14—Layered products comprising a layer of metal next to a fibrous or filamentary layer
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/18—Layered products comprising a layer of metal comprising iron or steel
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/30—Properties of the layers or laminate having particular thermal properties
- B32B2307/304—Insulating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
- B32B2307/538—Roughness
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/24—Structural elements or technologies for improving thermal insulation
- Y02A30/242—Slab shaped vacuum insulation
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B80/00—Architectural or constructional elements improving the thermal performance of buildings
- Y02B80/10—Insulation, e.g. vacuum or aerogel insulation
Definitions
- the present invention relates to, for example, vacuum insulation panels used for insulation of walls and ceilings and floors of buildings such as houses, vacuum insulation panels used for insulation of interior spaces of vehicles and engine rooms etc., vending machines for beverages
- the present invention relates to a vacuum heat insulation panel used for a heat exchanger such as a refrigerator or a hot water supply device, an electric pot, a copy machine or the like.
- heat insulation performance of the internal space is enhanced to reduce the amount of electricity consumed. It has been attempted to improve the heat shielding performance to block heat introduced from the outside by this.
- Patent Document 1 As means for improving the heat insulation performance, using a vacuum heat insulation panel is disclosed in Patent Document 1 below.
- the vacuum insulation panel disclosed in Patent Document 1 is to be fixed to a roof panel, a roof rail, etc. of a car, and a non-woven fabric is housed inside a laminate material case to make it in a vacuum state. It was done in
- Patent Document 2 An example of a vacuum insulation panel is disclosed in Patent Document 2.
- a core material made of inorganic fiber is housed in a case made of a gas barrier film together with a gas adsorbent, vacuum suction is performed inside the case, and the opening is heat sealed with the film. It is manufactured by sealing.
- the present invention has been made in view of such circumstances, and by suppressing the rise of the thermal conductivity within a certain period immediately after the manufacture of the vacuum heat insulation panel, the good heat insulation performance close to the heat insulation performance immediately after the manufacture It is an object of the present invention to provide a vacuum insulation panel capable of maintaining the
- the vacuum heat insulation panel of the present invention is a vacuum heat insulation panel in which a core material made of inorganic fiber is wrapped with a stainless steel steel plate outer package material, and the inner space of the outer package material wrapped in the core material is vacuumed.
- the core material is heated to a moisture content of 0.05% by weight or less, the surface roughness Ra of the surface on the inner space side of the outer packaging material is 0.2 ⁇ m or less, and the core material is The peripheral portion of the outer wrapping material is sealed by welding in a state in which the pressure of the internal space of the outer wrapping material wrapped in the outer wrapping material is 1 Pa or less.
- the performance deterioration of the vacuum heat insulation panel can be achieved by sealing the outer packaging material by welding, so that it is possible to suppress moisture permeation, and also with this, it is possible to suppress the change with time.
- the manufacturing of the vacuum insulation panel of the present invention is to manufacture a vacuum insulation panel in which a core material made of inorganic fiber is wrapped with a stainless steel steel sheet outer shell material and the inner space of the outer shell material is wrapped in vacuum.
- a process of heating the core material to make the amount of water contained in the core material 0.05 wt% or less, a process of wrapping the core material with the outer packaging material, and an outer package wrapping the core material It can carry out by the method of the sealing process which seals the opening part of the said outer packaging material by welding in the state which made the pressure of the internal space of the material 1 Pa or less.
- the possibility of maintaining good thermal insulation performance close to the thermal insulation performance immediately after production can be increased over a long period of time.
- the core material 1 supports the outer packaging material 2 from the inside so that the outer packaging material 2 of the manufactured vacuum insulation panel 10 does not collapse by atmospheric pressure.
- Inorganic fibers are used for the core material 1. Glass wool, a ceramic fiber etc. are illustrated as an inorganic fiber. It is desirable to use a core material 1 that does not contain any binder. If a core material containing a binder is used, outgassing is generated from the core material with time, and the heat insulation performance may be deteriorated with time.
- the outer packaging material 2 is composed of two outer packaging plates 2A and 2B. Stainless steel sheets are used for these outer cover plates 2A and 2B.
- the two outer casing plates 2A and 2B have the same shape and size of the peripheral portion.
- the bulging portion 4 is formed on at least one of the outer cover plates 2B, and the peripheral edge portions of the two outer cover plates 2A and 2B are aligned and superimposed to form a concave side surface of the bulging portion 4 of one outer cover plate 2B.
- An inner space 3 is formed between the other outer cover plate 2A.
- the surface roughness Ra of the surface of the outer cover plate inside the inner space 3 constituted by the outer cover plates 2A and 2B is 0.2 ⁇ m or less, and the core material 1 is accommodated in the inner space 3.
- the two outer casing plates 2A and 2B illustrated in the drawings are rectangular when viewed from the thickness direction.
- the regulation of the surface roughness Ra of the surface on the inner space 3 side of the outer packaging material 2 relates to the moisture adsorbed on the surface of the outer packaging material 2 on the inner space 3 side. That is, since the actual surface area is larger than the apparent surface area as the surface roughness Ra is larger, the larger the surface roughness of the surface on the inner space 3 side of the outer packaging material 2 is, the more the surface is brought into the inner space of the vacuum heat insulation panel 10 This is because the amount of water increases. The reason for setting the surface roughness Ra to 0.2 ⁇ m or less will be described later.
- the manufacturing of the vacuum heat insulation panel 10 in this embodiment includes a moisture removing step of removing moisture contained in the core 1, a core embedding step of wrapping the core 1 with the outer wrapping 2 and a welding step of welding the outer wrapping 2 And is mainly implemented.
- the core material 1 is subjected to heat treatment to remove the water contained in the core material 1 until the water content becomes 0.05 wt% or less (preferably 0.02 wt% or less).
- the reason for setting the water content of the core material 1 to 0.05% by weight or less (preferably 0.02% by weight or less) will be described in detail later.
- the core material embedding step after the water content of the core material 1 becomes equal to or less than the above value and the temperature of the core material 1 decreases to a predetermined temperature, the core material 1 is concave side of the bulging portion 4 of the outer cover plate 2B. , And the peripheral portions of the two outer casing plates 2A and 2B are aligned and superimposed. As a result, the core 1 is in a state of being wrapped by the outer cover plate 2.
- the welding process will be described with reference to FIG.
- the welding process is performed in a first welding process performed to provide the opening 6 in a part of the peripheral portion of the outer packaging material 2 and in vacuum, and provided in the first welding process while maintaining the internal space 3 in a vacuum state. It divides into the 2nd welding process performed in order to seal an opening.
- the first welding step can be performed in the atmosphere.
- seam welding As a welding method, known welding methods such as seam welding, arc welding, laser welding, electron beam welding can be used.
- the outer casing plates 2A and 2B are thin stainless steel plates, it is preferable to use seam welding. This is because the outer casing plates 2A and 2B are thin stainless steel plates, therefore, when the bulging portion is formed by drawing, wrinkles may occur in the peripheral portion, and the peripheral portion in which the wrinkles are formed is welded Then, it is because there is a high possibility that welding defects will occur in the gap between the two outer cover plates 2A and 2B. As welding defects, melting off etc. are mentioned. Therefore, it is preferable to weld without gaps while crushing wrinkles using seam welding that can be performed while pressing from above and below the outer casing plates 2A and 2B.
- FIG.2 is explanatory drawing of a 1st welding process.
- a plate of the outer cover plate is accommodated by seam welding to the peripheral edge of a state in which the core material 1 is accommodated on the concave side of the bulging portion 4 of the outer cover plate 2B and the peripheral portions of the two outer cover plates 2A and 2B are aligned and overlapped.
- seam welding is performed on each of three sides (7a, 7b, 7c) of the peripheral portions of the four sides of the outer cover plate 2 in a straight line to seal them.
- This first welding step can be performed in the atmosphere.
- the second welding step needs to be performed in vacuum. This is to evacuate the internal space 3 via the opening 6 and bring it into a vacuum state of a pressure of 1 Pa or less. Therefore, by preparing a device in which a seam welding machine is installed in a vacuum chamber and performing seam welding on the opening 6 in vacuum in this device, the sealing portion 7d is formed, the vacuum of the present invention Thermal insulation panels can be manufactured.
- a plurality of vacuum insulation panels are manufactured on a trial basis, each using a core material 1 composed of a plurality of glass wools containing different amounts of moisture, and the thermal conductivity immediately after the trial and the change in thermal conductivity over time almost ceases
- the thermal conductivity of 5 mW / m ⁇ K which is the average level of the thermal conductivity immediately after production, of a high performance vacuum insulator generally used in the world is taken as the upper limit of the permissible thermal conductivity
- the moisture content of the core material 1 is about 0.05% by weight when the thermal conductivity is satisfied.
- the coulometric titration type Karl Fischer moisture meter made from Kyoto Electronics Industrial Co., Ltd. was used.
- the vacuum heat insulation panel 10 capable of maintaining good heat insulation performance for a long time can be manufactured by removing the water content of the core material 1 made of glass wool to 0.02% by weight. .
- 0.05 wt% is the upper limit as the moisture content of core material 1 which can be expected to be finally confined to 5 mW / m ⁇ K or less. It can be seen that it is. From this, in the present embodiment, the water content of the core material 1 is set to 0.05% by weight or less (preferably 0.02% by weight or less).
- Example 1 Hereinafter, specific examples of the vacuum heat insulation panel 10 will be described.
- the stainless steel foil (SUS304) was prepared with five types of surface roughness Ra of 0.05 ⁇ m, 0.10 ⁇ m, 0.20 ⁇ m, 0.30 ⁇ m, and 0.40 ⁇ m, respectively.
- the bulging part 4 of 190 mm x 190 mm x height 5.0 mm was provided in one outer cover plate 2B by the drawing process of press molding.
- glass wool of about 1200 g / m 2 was used for the core material 1. Then, this glass wool is inserted in advance into an electric furnace in the air atmosphere, heat-treated at a temperature of 200 ° C. for 3 hours, taken out of the furnace, and promptly used in a desiccator with room temperature (20 ° C.) and relative humidity of 30%. It was transferred and subjected to cooling treatment for 30 minutes.
- the conditions of the heat treatment and the cooling treatment are conditions determined by preliminary experiments to determine that the amount of water contained in the core material 1 is 0.03 to 0.04% by weight.
- the core material 1 after the cooling treatment was taken out from the desiccator, and the outer cover plate 2A, the core member 1, and the outer cover plate 2B were stacked in this order.
- the core material 1 was accommodated in the bulging portion 4 provided on the outer cover plate 2B so as to be filled without any gap.
- the peripheral edge of the outer cover plate 2A and the peripheral edge of the outer cover plate 2B were welded and joined while being pressurized by seam welding in the atmosphere.
- the seam welding was divided into three times along the outer periphery of the three sides of the rectangular outer cover plates 2A and 2B, and they were each linearly welded, and the remaining one side was left as an opening.
- the seam welding machine used was a single-phase alternating current type, the upper electrode was a disk having a diameter of 100 mm and a thickness of 4 mm, and the curvature of the electrode tip was 20R.
- the lower electrode is a block of 4 mm in thickness.
- the upper and lower electrodes are both made of chromium copper.
- the welding conditions were: applied pressure: 150 N, welding speed: 1 m / min, welding current: 1.6 kA, and on / off ratio of energization time was 3 ms / 2 ms.
- the workpiece to be welded on the three sides and the seam welder were brought into a vacuum chamber, and the vacuum chamber was connected to a vacuum pump and evacuated until the pressure in the outer packaging plates 2A and 2B was 1 Pa or less. After that, the opening was welded and sealed as it was in vacuum.
- Thermal conductivity was evaluated as performance evaluation of the manufactured vacuum insulation panel. It carried out by measuring the time-dependent change of the heat conductivity in the following environment. First, the thermal conductivity of the vacuum insulation panel immediately after production was measured, and then the vacuum insulation panel was subjected to an environmental load test in which both a high temperature environment and a low temperature environment were repeated. Specifically, the vacuum insulation panel is maintained at a temperature environment of 80 ° C. for 12 hours, then held at a temperature environment of ⁇ 15 ° C. for 12 hours, and thereafter, these temperature environments are alternately repeated every 12 hours to form a temperature cycle. did. 60 days after the start of the environmental impact test, the vacuum insulation panel was taken out and the thermal conductivity was measured. After the measurement of the thermal conductivity, the above environmental impact test was continued again. After that, the vacuum insulation panel was taken out similarly every 60 days, the thermal conductivity was measured, and the environmental impact test was continued.
- the thermal conductivity is evaluated using a thermal conductivity measuring device HC-074 / 200 manufactured by Eko Seiki Co., Ltd., under the condition that the average temperature at the center of the vacuum insulation panel is 25 ° C., the surface roughness Ra of the stainless steel foil is Thermal conductivity was measured for different vacuum insulation panels.
- required the average value about three vacuum heat insulation panels with the same, and it was set as the heat conductivity for every surface roughness Ra of stainless steel foil.
- Table 1 shows the measurement results of thermal conductivity at every 60 days of the environmental impact test immediately after the production of the vacuum insulation panel.
- the vacuum thermal insulation panel shown by No. A in Table 1 having the smallest surface roughness Ra of the stainless steel plate (the one shown in Table 1) has a thermal conductivity after 180 days as compared with the thermal conductivity immediately after production. In the point of deterioration of the insulation performance, it was a vacuum insulation panel which was extremely excellent.
- Vacuum insulation panels other than the 0.05 ⁇ m vacuum insulation panel (the one indicated by No. A in Table 1) with the smallest surface roughness Ra of the stainless steel sheet have thermal conductivity of between 180 days after immediately after production. Although an increase is observed, the thermal conductivity of any vacuum insulation panel is greatly increased from immediately after production until 60 days after that, and the change after that is small and the thermal conductivity is stable. This means that most of the water adsorbed and brought into the surface of the stainless steel plate used for the outer packaging material by 60 days after production immediately becomes gas molecules due to the temperature increase of the vacuum insulation panel, It is because it was released into the inner space.
- the increase in thermal conductivity is very small after 60 days from immediately after production.
- the vacuum insulation panel of the present invention was joined by seam welding instead of using heat seal for joining the peripheral parts of the outer packaging materials 2A and 2B, so that water did not enter the interior of the vacuum insulation panel from the peripheral part I understand. That is, the welded structure is effective to maintain the insulation performance of the vacuum insulation panel over a long period of time.
- the surface roughness Ra of the surface on the inner space 3 side of the outer packaging material 2 is an index of 0.2 ⁇ m or less, considering that the change in the thermal conductivity is small. .
- the vacuum insulation panel manufactured by practicing the present invention is suitably used for insulation of walls and ceilings and floors of buildings such as houses, and suitably used for insulation of interior spaces of vehicles, engine rooms, etc. Moreover, it is suitably used for drinks vending machines and refrigerators, heat exchangers such as water heaters, electric pots, electric machines such as copying machines.
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Abstract
Description
外包材2の内部空間3側となる面の表面粗さRaを規制するのは、外包材2の内部空間3側の表面に吸着する水分に関連する。つまり、表面粗さRaが大きい表面ほど、見掛け表面積よりも実際の表面積は大きいから、外包材2の内部空間3側の面の表面粗さが大きいほど、真空断熱パネル10の内部空間に持ち込まれる水分量は増えるためである。表面粗さRaを0.2μm以下とする理由については後述する。
図2(a)は、第一溶接工程の説明図である。芯材1を外包板2Bの膨出部4の凹側に収容し、2枚の外包板2A,2Bの周縁部を揃えて重ね合わせた状態の周縁部に対し、シーム溶接により外包板の板厚方向に加圧しながら、外包板2の4辺の周縁部のうち3辺(7a、7b、7c)に対し、それぞれに直線状にシーム溶接を行って封止する。その結果、周縁部の1辺が開口部6として残ることになる。この第一溶接工程は、大気中で行うことができる。
つぎに、芯材1が含有する水分量を0.05重量%以下とする理由について説明する。
図3に、芯材1が含有する水分量をどの程度まで除去すれば、ある程度の断熱性能を維持することができるかを調査した結果示す。この図は、含有する水分量が異なる複数のグラスウールからなる芯材1をそれぞれ使用した真空断熱パネルを複数試作し、試作直後の熱伝導率と、熱伝導率の経時変化が概ね止まる3ヶ月後の熱伝導率とを調査した結果を示している。一般的に世の中で使用されている高性能な真空断熱材の、製造直後の熱伝導率の平均的なレベルである熱伝導率5mW/m・Kを許容熱伝導率の上限とした場合、この熱伝導率を満足するものは、芯材1の含有する水分量が0.05重量%程度であることがこの調査結果からわかる。なお、芯材1が含有する水分量の測定には、京都電子工業株式会社製の電量滴定式カールフィッシャー水分計を使用した。
以下、真空断熱パネル10の具体的な実施例について説明する。芯材1を包み込む外包材2を構成する外包板2A,2Bには、寸法が220mm×220mm×厚さ100μmのステンレス箔(SUS304)を用いた。ステンレス箔(SUS304)は、表面粗さRaが、それぞれ0.05μm、0.10μm、0.20μm、0.30μm、0.40μmの5種類のものを準備した。また、一方の外包板2Bには、プレス成形の絞り加工により、190mm×190mm×高さ5.0mmの膨出部4を設けた。
まず、製造直後の真空断熱パネルの熱伝導率を測定し、そのあと、真空断熱パネルを、高温環境と低温環境の両方を繰り返す環境負荷試験に供した。詳しくは、真空断熱パネルを80℃の温度環境で12時間保持したあと、-15℃の温度環境で12時間保持し、その後は、これらの温度環境を12時間毎に交互に繰り返す温度サイクルを形成した。この環境負荷試験を開始して60日経過した時点で真空断熱パネルを取り出し、熱伝導率を測定した。熱伝導率の測定後には、再び、上記環境負荷試験を継続した。その後も60日経過ごとに同様に真空断熱パネルを取り出し、熱伝導率を測定し、環境負荷試験を継続した。
2 外包材
3 内部空間
4 膨出部
6 開口部
10 真空断熱パネル
Claims (1)
- 無機繊維からなる芯材をステンレス鋼板製の外包材で包み込み、その芯材を包み込んだ外包材の内部空間が真空状態とされた真空断熱パネルであって、
前記芯材が含有する水分量が0.05重量%以下で、
前記外包材の内部空間側となる面の表面粗さRaが0.2μm以下であり、
前記芯材を包み込んだ外包材の内部空間の圧力が1Pa以下であり、
外包材の周縁部を溶接により封止した、真空断熱パネル。
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SI201731150T SI3508771T1 (sl) | 2016-09-02 | 2017-09-01 | Vakuumska izolacijska plošča |
CA3035326A CA3035326A1 (en) | 2016-09-02 | 2017-09-01 | Vacuum insulation panel |
CN201780053401.5A CN109844392B (zh) | 2016-09-02 | 2017-09-01 | 真空绝热板 |
US16/329,851 US20190242120A1 (en) | 2016-09-02 | 2017-09-01 | Vacuum insulation panel |
KR1020197009478A KR102356138B1 (ko) | 2016-09-02 | 2017-09-01 | 진공 단열 패널 |
EP17846715.5A EP3508771B1 (en) | 2016-09-02 | 2017-09-01 | Vacuum insulation panel |
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JP2016171879A JP2018035923A (ja) | 2016-09-02 | 2016-09-02 | 自動車用真空断熱パネル |
JP2016-171879 | 2016-09-02 | ||
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JP2016171880A JP2018035924A (ja) | 2016-09-02 | 2016-09-02 | 電気機器用真空断熱パネル |
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DE202021107040U1 (de) | 2021-12-23 | 2022-01-13 | Va-Q-Tec Ag | Vakuumisolationselement |
EP3960948A1 (de) | 2020-08-27 | 2022-03-02 | va-Q-tec AG | Temperaturstabiles vakuumisolationselement |
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CN109844392A (zh) | 2019-06-04 |
CA3035326A1 (en) | 2018-03-08 |
KR102356138B1 (ko) | 2022-01-26 |
US20190242120A1 (en) | 2019-08-08 |
EP3508771A1 (en) | 2019-07-10 |
CN109844392B (zh) | 2021-05-28 |
SI3508771T1 (sl) | 2022-07-29 |
EP3508771A4 (en) | 2020-03-18 |
EP3508771B1 (en) | 2022-03-16 |
KR20190042087A (ko) | 2019-04-23 |
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