• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a thermosolant vacuum structure (7) and a thermosolant vacuum housing (7), which are excellent in handling and heat insulating capacity. A vacuum heat insulation structure (7) comprises a gas barrier vessel (outer jacket (4)) having an impermeability to air and a core material (5) and a gas absorbent (6), which are enclosed in the outer jacket (4) under reduced pressure at a predetermined vacuum level. A core material 5 has a laminated structure in which a plurality of sheet-like organic fiber assemblies (fiber assemblies) 1 are laminated. The fiber assemblies (1) consist of a plurality of organic fibers (2x ) arranged at a predetermined interval and a plurality of organic fibers (2y) arranged perpendicularly to the aforementioned organic fibers (2x) at a predetermined interval.
    公开号:BE1018383A5
    申请号:E2008/0420
    申请日:2008-07-25
    公开日:2010-10-05
    发明作者:Kyoko Nomura；Syuichi Iwatat；Tsukasa Takagi；Sho Hanaoka；Masanori Tsujihara
    申请人:Mitsubishi Electric Corp；
    IPC主号:
    专利说明:

    Vacuum thermosolant structure and thermosolant housing
    Technical area
    The present invention relates to a thermosolvent structure under vacuum and a thermosolant housing, in particular, a thermosolante structure under vacuum and a thermosolant housing suitable for the constitution of a cooling or heating apparatus. Background technique
    Until now, urethanes have been used as thermosolant material. However, recently, vacuum thermosolvent structures with much better heat insulation capabilities than urethanes have been used in conjunction with existing urethanes. Such vacuum thermosolvent structures are used for cooling or heating apparatus, such as fermentation tank coolers, car air conditioners and hot water suppliers in addition to refrigerators.
    A vacuum heat insulation structure is formed of an outer jacket formed of a gas-barrier (i.e., airtight) aluminum foil, wherein powder, a cellular material, a fibrous material or the like is contained as a core material and the pressure inside the outer jacket is maintained at several Pa.
    An example of factors lowering the heat-insulating ability of the heat-insulating structure to any vacuum is the release of gas from the core material or the existence in the core material of moisture other than the ingress of air or moisture from the outside of the vacuum thermosolvent structure. To adsorb this gas and this moisture, an adsorbent is provided in the outer jacket.
    Examples of the core material of thermosolvent vacuum structures include silica powder, urethane foam and glass fibers. In the present circumstances, the most commonly used core material is a fibrous material having the highest heat insulation capacity.
    Fibrous materials are roughly classified into two types of fibers, i.e., inorganic fibers and organic fibers.
    Inorganic fibers include glass fibers and carbon fibers (e.g., refer to Patent Documents 1 and 8).
    Organic fibers include polypropylene fibers, polylactic fibers, aramid fibers, LCP (liquid crystalline polymer) fibers, poly (ethylene terephthalate) fibers, polyester fibers, polyethylene fibers, and the like. cellulosic fibers (for example, refer to patent documents 2 and 7).
    Examples of the type of fibrous material include a flocculant type configuration and a laminate type configuration (for example, refer to Patent Documents 3 and 4).
    In addition, examples of the type of fibrous material also include sheets which are laminated so that in each of the sheets a direction of orientation of the fibers therein is perpendicular to that of adjacent sheets (refer to the documents patents 5 and 6).
    [Patent Document 1] Unexamined Japanese Patent Application Publication No. 8-028,776 (pages 2 and 3) [Patent Document 2] Unexamined Japanese Patent Application Publication No. 2002-188791 (pages 4 to 6, Fig. 1) [Patent Document 3] Unexamined Japanese Patent Application Publication No. 2005-344,832 (pages 3 and 4, Fig. 1) [Patent Document 4] Unexamined Japanese Patent Application Publication No. 2006-307 924 (pages 5 and 6, Fig. 2) [Patent Document 5] Unexamined Japanese Patent Application Publication No. 2006-017151 (page 3, Fig. 1) [Patent Document 6] Unexamined Japanese Patent Application Publication No. 7-103,955 (page 2, Fig. 2) [Patent Document 7] Unexamined Japanese Patent Application Publication No. 2006-283,817 (pages 7 and 8) [Document Japanese Patent Application Laid-open Publication No. 2005-344 870 (page 7, Fig. 2).
    Disclosure of the invention Problems to be solved by the invention
    In a conventional vacuum heat insulation structure, glass fibers and polyester fibers have been used as the core material.
    Glass fibers are hard and fragile and cause the appearance of dust particles that are dispersed during a manufacturing step. As a result, handling and workability are problems because the dispersed dust particles can cause irritation of the skin, mucous membranes, etc. operators. On the other hand, in the context of recycling, for example, when refrigerators are crushed into pieces in a recycling plant, the glass fibers contained in the flakes of urethane, etc. are subject to thermal recycling. These glass fibers disadvantageously have a lower combustion efficiency and remain in the form of residual waste, which leads to a reduction in recyclability.
    On the other hand, organic fibers, such as polyester fibers, are advantageous in terms of handling and recyclability. However, the thermal conductivity, which represents the thermal insulation efficiency of organic fibers, is 0.0030 W / mK (refer to patent document 7), while that of glass fibers is 0.0013 W / mK (refer to patent document 8). This makes the organic fibers disadvantageous in terms of thermal insulation capacity.
    The present invention has been developed to solve the aforementioned problems and provides a vacuum thermosolvent structure having certain advantages in handling and thermal insulation capability by providing a heat insulating casing comprising the vacuum thermosolvent structure.
    Means to solve problems
    The vacuum thermosolvent structure of the present invention is comprised of a gas barrier vessel and a core material received therein wherein the prevailing pressure is maintained at a low level.
    The core material has a laminated structure of organic fiber assemblies each of which is formed in a sheet of organic fibers. Advantages
    As mentioned above, the vacuum thermosolvent structure of the present invention has an advantage in handling and recyclability and an excellent heat-insulating capability in that the vacuum thermosolvent structure of the present invention is comprised of organic fiber assemblies. in the form of rolled sheets.
    BEST METHOD FOR IMPLEMENTING THE INVENTION First embodiment: thermosolvent structure under vacuum
    Figs. 1 to 4 are schematic views of the vacuum thermosolvent structure according to a first embodiment of the present invention. Fig. 1 is a perspective view of laminated layers forming a thin core material. Fig. 2 is a side view of a sheet showing the direction of the fibers. Fig. 3 is a side view of a thick sheet showing the direction of the fibers. Fig. · 4 · is an exploded perspective view showing a configuration of the vacuum thermosolvent structure.
    In FIG. 4, a vacuum thermosolvent structure 7 comprises a gas barrier vessel (hereinafter referred to as an "outer jacket") 4 having an impermeability to air and a core material 5 and a gas adsorbent 6, which are contained in the outer jacket 4. The pressure inside the outer jacket 4 is reduced to a predetermined vacuum level. Laminated structure
    As shown in FIG. 1, the core material 5 has a laminated structure, wherein a plurality of sheet-like organic fiber assemblies (hereinafter referred to as "fiber assemblies") 1 are laminated.
    As shown in FIG. 2, the set of fibers 1 is composed of a plurality of organic fibers 2x arranged at a predetermined interval and a plurality of organic fibers 2y arranged perpendicularly to the organic fibers 2x at a predetermined interval. The organic fibers 2x and the organic fibers 2y are in point contact with each other. Moreover, since the set of fibers 1 is formed to be thin, the amount of fibers arranged in the heat transfer direction is reduced and this leads to a lowering of their thermal conductivity.
    Although, in the case mentioned above, the organic fibers 2x and the organic fibers 2y intersect perpendicularly with each other, the present invention is not limited to this case and these fibers could intersect one another. other at an angle other than a right angle.
    Organic fibers
    In the first embodiment, polyester is used for the organic fibers 2 constituting the core material 5 of the thermosolvent vacuum structure 7. Examples of the material for the organic fibers 2 include polypropylene, polylactic acid , aramids and LCP (liquid crystalline polymers) other than polyester.
    If polypropylene is used, the productivity of the organic fibers can be improved because the propylene has a low hygroscopic property, which results in a reduction of vacuum suction time and drying time and is expected to an improvement in the thermo-insulating capacity of the thermosolvent vacuum structure because the polypropylene has a low thermal conductivity in the solid state.
    If polylactic acid is used, the removed and classified core materials of the products used can be used for soil regeneration because the polylactic acid is biodegradable.
    If an aramid or LCP is used, such as aramid and LCP have a high rigidity, a sufficient holding capacity of a vacuum pack under atmospheric pressure is obtained and a high level can be obtained. vacant spaces of the core material, which can lead to an improvement in the heat-insulating capacity of the thermosolvent structure under vacuum.
    Fiber assembly The fiber assembly (i.e., the set of organic fibers or the set of sheets) 1 constituting the core material 5 is made by removing a molten polyester resin by a method of free falling on a conveyor from a plurality of nozzles aligned on a desired length line, pressing the fallen polyester resin with a roller while moving the conveyor at a predetermined speed and winding the product obtained.
    A density of the fiber set 1 is controlled by the amount of molten resin discharge and the speed of the conveyor, so that sets of fibers of various thicknesses can be obtained.
    It should be noted that the set of fibers 1 obtained using the aforementioned method occasionally has a handling problem required to manufacture the vacuum thermosolvent structure because the organic fibers 2 are not bonded together. As a result, the organic fibers 2 are preferably welded to each other by heating them by carrying out a pressing treatment. In this welding step, excessive pressure or overheating can increase a contact area between the organic fibers 2, which leads to an undesirable increase in heat transfer. Accordingly, it is preferred that the contact area be reduced as much as possible and that the ratio of the contact surface to the entire area is preferably reduced to 5% or less.
    Then, the obtained fiber set 1 is cut into A4-size sheets and 25 sheets are laminated to form the core material 5. The number of sheets to be rolled can be freely determined on the basis of the thicknesses of the set of fibers obtained 1 and the desired vacuum thermosolvent structure 7. In the first embodiment, a diameter of the fibers included in the fiber set 1 is adjusted to about 15 pm by changing the diameter of the nozzles used in the forming step . When the heat-insulating capacity is taken into account, the diameter of the fibers is preferably small. Theoretically, the diameter of the fibers is preferably 10 μm or less. Outer shirt
    For the outer jacket 4 of the vacuum heat-sealing structure 7, a gas-barrier plastic laminate film consisting of nylon (6 μm), PET deposited on aluminum (10 μm), aluminum foil (6 μm) and high density polyethylene (50 μm).
    If a laminated film having a structure is used, in which a polypropylene film, a polyvinyl alcohol film and another polypropylene film are laminated without aluminum foil, the reduction of the heat-insulating capacity due to the bridging of heat can be reduced. It should be noted that three of the four sides of the outer jacket are sealed by heating using a sealing packaging machine.
    Manufacturing process
    The vacuum heat insulation structure 7 is made by inserting the core material 5 into the outer jacket 4 as a housing, fixing the housing with one of its open sides and drying the housing in a constant temperature oven of 105 ° C for half a day (about 12 hours) and then inserting the gas adsorbent 6 into the film housing to adsorb the remaining gas after packing under reduced pressure, the gas released from the core material 5 to the over time and the gas that had penetrated through a sealed layer of the outer jacket 4. Using a KASHIWAGI vacuum packaging machine (NPC Inc.; KT-650), the chamber was evacuated to a pressure of about 1 to 10 Pa and the open side of the film casing, which has been placed in the chamber, is sealed by heating to obtain a plate-shaped vacuum heat-sealing structure 7.
    Heat-insulating capacity
    The effects of the thickness of the fiber assembly 1 on the heat-insulating capacity with respect to the fiber assemblies 1 of Examples 1 to 4 of the present invention and a comparative example will now be described.
    For the comparative example, flocculant polyester fibers having the same diameter as that of the fibers (about 15 μm) used in Examples 1 to 4 are used as the core material and a vacuum thermosolvent structure is obtained using the same process. than the one mentioned above.
    The vacuum thermosolvent structures obtained in Examples 1 to 4 and the comparative example are measured with respect to the thermal conductivity, which is between a part having a temperature higher than 37.7 ° C. and a part having a lower temperature of 10.0 ° C. This measurement is made after waiting a day since the evacuation step using a thermal conductivity meter "Auto Λ HC-073 (EKO INSTRUMENTS Co., Ltd.)".
    The thickness of each set of fibers 1 is determined by dividing the thickness of the vacuum thermosolvent structure 7 minus two times the thickness of the outer jacket 4 by the number of sets of laminated fibers 1. The average diameter of the fiber is defined as a mean value of 100 values measured with a microscope. The results, which were calculated by dividing the thickness of a set of fibers measured after evacuation by the average fiber diameter, are shown in Table I.
    Table I
    Fig. 5 is a graph indicating the heat insulating capacity of the vacuum thermosolvent structure according to the first embodiment of the present invention. The abscissas represent values of a thickness of the set of fibers 1 divided by an average fiber diameter, and the ordinates represent a ratio of the heat-insulating capacity. It should be noted that the ratio of the heat-insulating capacity is a value which is calculated by dividing the thermal conductivities of the comparative example by the thermal conductivities of Examples 1 to 4 (i.e. each value is the inverse of the value calculated by dividing the thermal conductivity of one of Examples 1 to 4 by the thermal conductivity of the comparative example).
    Referring to FIG. 5, it is found that, if the thickness of the set of fibers 1 becomes less than 18 times the average diameter of the fibers, the heat-insulating capacity is improved in comparison with that of the comparative example, in which flocculent fibers serve as heart material. This is because the smaller the thickness of the set of fibers 1, the easier the fibers can be aligned in the direction parallel to the surface, the direction being perpendicular to a thermally insulating direction. In fact, it is conceivable that since the heat transfer path along the thermally insulating direction can be lengthened in the vacuum thermosolvent structure 7, its heat-insulating capacity can be further improved.
    Furthermore, it can be seen that the thickness of the set of fibers 1 can preferably be from 1 to 18 times the diameter of the fibers of the present application because the thickness of the set of fibers 1 becomes close to average diameter of the fibers, plus the thermosolante capacity improves.
    It should be noted that the thickness of the set of fibers may preferably be from 1 to 8 times the average diameter of the fibers because the heat-insulating capacity improves significantly in the case where the thickness of the set of fibers Fiber 1 becomes 8 times the fiber diameter or less.
    Second embodiment: thermosolvent structure under vacuum
    Figs. 6 and 7 are perspective views schematically showing the method for laminating layers of the core material constituting the vacuum thermosolvent structure of a second embodiment of the present invention.
    As shown in FIG. 6, the core material 5 is composed of a set of fibers having a folded continuous sheet form without being cut to form a rolled structure.
    As shown in FIG. 7, using a first set of 1x fibers having a continuous web form without being cut and a second set of ly fibers having a continuous web form without being cut (subsequently, they are also referred to as "fiber sets 1" ), the assemblies are arranged to intersect each other so that surfaces of the sets divided by the fold lines can be alternately laminated by folding each of the sets so that the other set is positioned between his layers.
    In fact, by folding the fiber assemblies 1 so as to laminate them, a cutting step can be omitted so that the core material 5 or the vacuum heat insulation structure 7 can be efficiently manufactured.
    Since the set of fibers 1 used in the present embodiment is formed by the aforementioned manufacturing method, the organic fibers 2 are oriented along the longitudinal direction. Considering what is explained above, if the sets of fibers 1 are alternately laminated so as to intersect each other, they come in point contact with each other, resulting in a capacitance. thermosolant still improved.
    Third embodiment: refrigerator
    Fig. 8 is a cross-sectional elevational view schematically showing a refrigerator and discloses a heat-insulating casing shown in the third embodiment of the present invention. It should be noted that the same reference notations will be used to denote common components of the first embodiment and the second embodiment, thus avoiding a redundant description.
    As shown in FIG. 8, a refrigerator 100 comprises an outer casing 9, an inner casing 10 housed in the outer casing 9, a vacuum heat-insulating structure 7 and polyurethane foam 11 disposed in a gap between the outer casing 9 and the inner casing 10, and a freezing unit (not shown in the drawings) for providing a source of cold to the inner housing 10. The outer housing 9 and the inner housing 10 have openings on a common face side and a door is provided therein ( the opening and the door are not shown in the drawings).
    In the present embodiment, since the outer jacket 4 of the vacuum heat insulation structure 7 comprises an aluminum foil, this aluminum foil can serve as a heat bridge, in which a thermoconduction occurs. To suppress thermal conduction via heat bridging, the vacuum heat insulation structure 7 is placed in a position opposite to a steel panel coated with the outer housing 9 by interposing a spacer 8 made of molded resin. It should be noted that the spacer 8 may have holes, if necessary, so that the spacer can prevent voids from forming in the polyurethane foam and facilitate the flow of the polyurethane foam to be applied in the process. interval of a thermosolant wall during a step to be performed thereafter.
    In fact, the refrigerator 100 has a thermally insulating wall 12 made up of the thermosolvent vacuum structure 7, the spacer 8 and the polyurethane foam 11. The region where the thermally insulating wall 12 is provided is not limited and may constitute all or part of the gap formed between the outer housing 9 and the inner housing 10 and may also be in the door mentioned above.
    Once the use of the refrigerator 100 is complete, it must be dismantled and recycled in a recycling plant according to the Home Appliance Recycling Law. Since the refrigerator 100 of the present invention has the vacuum thermosolvent structure 7 comprising core material 5 consisting of fiber assembly 1 (formed from organic fibers 2), the refrigerator can be subjected to a grinding treatment without removing the Vacuum thermosolvent structure 7. Accordingly, in thermal recirculation, no reduction in combustion efficiency is produced and no combustion residues are formed. This shows the high recyclability of the refrigerator 100 of the present invention.
    On the other hand, in the case where a refrigerator is provided with a vacuum thermosolvent structure employing an inorganic powder as a core material, the inorganic powder will be dispersed when the panel is fractured. As a result, the refrigerator can not be subjected to grinding treatment without dismantling the thermosolvent vacuum structure of the refrigerator body. This is a difficult operation.
    In the case where the vacuum thermosolvent panel has glass fibers as a core material, the refrigerator may be subjected to a grinding treatment without disassembly operation. However, when mixed glass fibers are crushed to ground polyurethane fragments and subjected to thermal recycling, the crushed glass fibers reduce the combustion efficiency or remain as residues after combustion, so that recyclability of the refrigerator is lowered.
    It should be noted that the embodiment / supra shows an example of a refrigerator as a thermosolant housing. However, the present invention is not limited to this example. The present invention can be used for cooling or heating apparatus, such as cooling devices for fermentation tanks, car air conditioners, hot water suppliers and, moreover, heat-insulating sachets (containers thermoisolants) comprising external sachets and transformable internal sachets instead of thermosetting casings having a predetermined shape.
    Industrial applicability
    As mentioned above, since the vacuum heat insulation structure and the heat-insulating casing of the present invention have a certain advantage in terms of handling, heat-insulating capacity and recyclability, they can be widely used as a vacuum thermosolvent structure in various instruments and as thermosolant housing or thermosolant bag in various applications.
    Brief description of the drawings
    Fig. 1 is a perspective view showing a core material laminated in thin layers to provide a vacuum thermosolvent structure of the first embodiment of the present invention.
    Fig. 2 is a side view showing the direction of the fibers in a sheet of a vacuum thermosolvent structure shown in FIG. 1.
    Fig. 3 is a side view showing the direction of the fibers in a thick sheet of a vacuum thermosolvent structure shown in FIG. 1.
    Fig. 4 is an exploded perspective view showing a configuration of a thermally insulating structure under vacuum.
    Fig. 5 is a graph indicating the heat-insulating capacity of the vacuum thermosolvent structure according to the first embodiment.
    Fig. 6 is a perspective view which schematically shows the method of rolling the core material constituting the vacuum thermosolvent structure of a second embodiment of the present invention.
    Fig. 7 is a perspective view which schematically shows the method of rolling the core material constituting the vacuum thermosolvent structure of the second embodiment of the present invention.
    Fig. 8 is a cross-sectional view schematically showing a thermosolant package (refrigerator) of a third embodiment of the present invention.
    Reference Notations 1: fiber set (set of organic fibers in sheet form) 2: organic fiber 2x: organic fiber 2y: organic fiber 3: gap 4: outer jacket 5: core material 6: gas adsorbent 7: structure thermosolvent under vacuum, 8: spacer 9: outer casing 10: inner casing 11: polyurethane foam 12: heat-insulating wall 100: refrigerator.
    权利要求:
    Claims (7)
    [1]
    A vacuum thermosolant structure, comprising: a gas barrier vessel comprising a core material received therein, wherein the pressure in the gas barrier vessel (4) is kept low, and the core material ( 5) has a laminated structure of sets of organic fibers (1), each of which is formed in a sheet composed of organic fibers, wherein the thickness of the set of organic fibers (1) received in the gas barrier container (4) under the low pressure is 1 to 18 times the diameter of the organic fibers.
    [2]
    Vacuum thermosetting structure (7) according to claim 1, wherein the set of organic fibers (1) is formed into a sheet by compression and welding of organic fibers (2) together.
    [3]
    Vacuum thermosetting structure (7) according to any one of claims 1 to 2, wherein the core material (5) has the laminated structure comprising the sets of organic fibers (1) which are folded, so as to constitute the laminated structure.
    [4]
    Vacuum thermosetting structure (7) according to claim 3, wherein the core material (5) is composed of a first set of organic fibers (1) folded to form the laminated structure and a second set organic fibers (1) folded to form the laminated structure, and the first set of organic fibers (1) and the second set of organic fibers (1) are laminated so as to cross each other.
    [5]
    A thermosolant housing, comprising: (a) an outer housing (9); (b) an inner housing (10) housed in the outer housing; and (c) a vacuum thermosolvent structure (7) according to any one of claims 1 to 4 disposed in all or part of an interval formed between the outer casing (9) and the inner casing / (10) .
    [6]
    6. heat insulating housing according to claim 5, wherein a thermosolant material is disposed between the outer casing (9) and the vacuum thermosolante structure and / or between the inner casing (10) and the vacuum thermosolante structure (7).
    [7]
    The thermosolant housing of claim 5 or 6, further comprising temperature control means for controlling the temperature within the inner housing (10).
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    JP2007204400|2007-08-06|
    JP2007204400A|JP4789886B2|2007-08-06|2007-08-06|Vacuum insulation and insulation box|
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