JP6535202B2 - Vacuum insulation material and insulation box using the same - Google Patents

Description

  The present invention relates to a vacuum heat insulating material having a heat insulating function and a heat insulating box using the vacuum heat insulating material.

  Energy saving is being promoted in various fields in order to reduce emission of carbon dioxide (CO2) as a social action to prevent global warming. For example, energy saving is also an important issue in home appliances. In particular, even in the case of a refrigerator, which is a household electrical appliance related to cold and heat, a refrigerator with improved heat insulation performance is required from the viewpoint of reducing power consumption.

  In the case of a refrigerator, reducing the amount of heat leakage from inside the refrigerator, which is a heat insulation box, directly leads to power saving. As is well known, a refrigerator is composed of a heat insulation box main body and a heat insulation door (hereinafter both are collectively referred to as a heat insulation box) combining foam polyurethane foam and a vacuum heat insulating material, and having high heat insulation performance while increasing capacity and compactness. Are trying to The heat insulation performance of the vacuum heat insulating material greatly contributes to the power saving of such a refrigerator.

  And in such a vacuum heat insulating material, improvement of the heat insulation performance itself of a vacuum heat insulating material, maintenance of heat insulation performance, and deterioration suppression are important. That is, it is important to improve and maintain the degree of vacuum inside the vacuum heat insulating material, and from such a point of view, remove air, moisture, etc. remaining inside the vacuum heat insulating material after vacuuming or entering from the outside. The function of the adsorbent is important.

  In a vacuum heat insulating material used for a refrigerator, for example, as shown in JP-A-2014-524557 (patent document 1), a core material is enclosed in the inside of the outer packaging material and a non-woven fabric in the core material It has been proposed to arrange an adsorbent which adsorbs the contained water and gas. Furthermore, in order to hold the adsorbent at a predetermined position with respect to the core material, in Patent Document 1, as shown in FIG. 3a, an adsorbent insertion portion consisting of a recess is formed on the opposing surfaces of the two core materials, After disposing the adsorbent in the adsorbent insertion portion, vacuum suction is performed to manufacture a vacuum heat insulating material.

Japanese Patent Application Publication No. 2014-524557

  However, in the vacuum heat insulating material described in Patent Document 1, in order to form the adsorbent insertion portion for arranging the adsorbent, the core material at the position corresponding to the adsorbent insertion portion is reduced to form a concave adsorbent insertion portion Form. For this reason, the amount of the core material for heat insulation decreases near this adsorbent insertion part, and the subject that heat insulation performance falls arises.

  An object of the present invention is to provide a novel vacuum heat insulating material capable of placing an adsorbent at a predetermined position without reducing the amount of core material, and a heat insulating box using the vacuum heat insulating material.

  The present invention is characterized in that at least two sheets of glass fiber assembly are stacked to form a core material, and an adsorbent storage portion is formed in predetermined two opposing areas of at least two sheets. The two sheets are partially joined together, and the adsorbent is housed and disposed in the adsorbent storage portion.

  According to the present invention, since predetermined regions of two opposing sheets of two sheets are partially joined to form an adsorbent storage unit, and the adsorbent is stored and disposed in the adsorbent storage unit, the core material The adsorbent can be placed at a predetermined position without reducing the amount of hydrogen and the decrease in heat insulation performance can be suppressed.

It is a sectional view showing the section of the vacuum heat insulating material which becomes a 1st embodiment of the present invention. It is a top view of the sheet provided with the adsorption material storage part shown in FIG. It is an enlarged view which shows the glass fiber of the vacuum heat insulating material shown in FIG. It is a top view which shows the 1st modification of adsorption agent storage part. It is a top view which shows the 2nd modification of adsorption agent storage part. It is a top view which shows the 3rd modification of an adsorption agent storage part. It is sectional drawing which shows the cross section of the sheet | seat which becomes the 2nd Embodiment of this invention. It is sectional drawing which shows the cross section of the vacuum heat insulating material which becomes the 3rd Embodiment of this invention. It is sectional drawing which shows the cross section of the sheet | seat which becomes the 4th Embodiment of this invention. It is sectional drawing which shows the cross section of the sheet | seat which becomes the 5th Embodiment of this invention. It is sectional drawing which shows the cross section of the sheet | seat which becomes a modification of 5th Embodiment. It is a front view of a refrigerator which uses a vacuum heat insulating material. It is sectional drawing which shows the AA longitudinal cross section of the refrigerator shown in FIG.

  Next, embodiments of the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to the following embodiments, and various modifications and applications may be made within the technical concept of the present invention. Is included in the range.

  A first embodiment of the present invention will be described using FIGS. 1 and 2. In FIG. 1, a vacuum heat insulating material 40 in the present embodiment is formed by laminating a plurality of sheets 41 made of glass fiber aggregates to form a core material 42, and the core material 42 is a surface protective layer, a first gas barrier layer, a second A state in which the inside of the outer packaging material 43 is evacuated by a vacuum packaging apparatus and vacuumed in a state in which a laminated film consisting of a four-layer configuration of a gas barrier layer and a thermal welding layer is put into a bag The degree of vacuum of the depressurized space is maintained by thermally welding one side of the outer packaging material by heat sealing.

  An adsorbent 46 for adsorbing a gas or liquid such as air or moisture is disposed between two adjacent sheets 41A and 41B of the glass fiber aggregate sheet 41 forming the core material 42. Further, in the present embodiment, the adsorbent storage portion 45 is formed in predetermined regions of two opposing surfaces of at least two sheets 41A and 41B. The predetermined area is an arbitrary position, but is generally formed substantially at the center of the sheet 41.

  As shown in FIG. 2, the adsorbent storage portion 45 is formed to have a size capable of storing the adsorbent 46, and the bonding wire portion 47 having a predetermined width around the position where the adsorbent 46 is located has two sheets 41 A. , 41B are partially joined to form a bag. The bag-like shape is not only annularly bonded as shown in FIG. 2, but also includes various forms. This will be described later with reference to FIGS. 4A to 4C. In addition, the bonding method for forming the adsorbent storage unit 45 may be any of various methods such as stacking two sheets 41A and 41B, stitching, heat-sealing, bonding, or engaging with a needle punch. A bonding method can be adopted.

  Moreover, in the present embodiment, one adsorbent storage unit 45 is provided near the center of the sheet 41, but the arrangement position and the arrangement number thereof are not limited to this, and for example, may be on the outer peripheral side Furthermore, two or more may be provided. Furthermore, the dimensions of the sheet 41 sandwiching the adsorbent do not have to match the dimensions of the other sheets.

  As described above, according to the present embodiment, the two sheets 41 are partially formed at the bonding line portion 47 so that the adsorbent storage portion 45 is formed in the predetermined regions of the two opposing surfaces of the at least two sheets 41. It joins and it is set as the structure which accommodated and arrange | positioned the adsorption agent 46 in this adsorption agent accommodating part 45. FIG. Therefore, the adsorbent 46 can be disposed at a predetermined position without reducing the amount of the core material, and a decrease in the heat insulation performance can be suppressed.

  Also, since only two sheets 41 are overlapped and joined, flexibility can be achieved. That is, the adsorbent storage portion 45 can be formed at any position according to the shape and size of the adsorbent 46.

  In addition, if the adsorbent 46 is simply placed on the sheet 41, positional displacement or spillage of the adsorbent 46 may occur, and the adsorbent 46 may be vacuumed in a state of being in contact with the outer packaging material 43 to generate uneven shape on the surface or There is a risk that a leak may occur. On the other hand, in the present embodiment, two sheets 41 are partially joined to form the adsorbent storage portion 45, and the adsorbent 46 is stored, arranged and vacuumed, so that the vacuum heat insulating material 43 is manufactured. There is no displacement or spillage of the adsorbent 46 during work.

  Furthermore, since the adsorbent 46 can be arranged at a predetermined position, the adsorbent 46 can be easily arranged at the optimum arrangement in design. In addition, the adsorption performance can be maintained for a long time by reducing the surface area by consolidating the adsorbent 46 in a predetermined range. In addition, since the sheet-like fiber assembly is used in the present embodiment, for example, compared to a cotton-like one such as dry glass wool, the formation of a joint portion forming the adsorbent storage portion and the formation to a predetermined position. There is an advantage of easy placement.

  Next, the specific structure of the vacuum heat insulating material in a present Example is demonstrated. The core material 42 of the vacuum heat insulating material in the present embodiment is a glass fiber aggregate obtained by forming glass fibers with an average fiber diameter of 2 to 5 μm obtained by centrifugation in a sheet shape so as to have a predetermined coating weight. The core material 42 is formed by laminating glass fiber aggregates formed in a sheet shape, so that even if the direction of the glass fibers constituting the sheet becomes substantially parallel to the thickness direction of the sheet which is the heat insulation direction, The thermal path to be formed is limited within the range of the thickness of the sheet.

  Moreover, even if it is assumed that fibers substantially parallel to the thickness direction of the sheets are present in each sheet to be laminated, when the sheets are laminated, the fibers substantially parallel to the thickness direction are in contact with each other, The probability of forming a thermal path is low, which is advantageous in terms of thermal insulation performance as a vacuum insulation material.

  Although the glass fiber by the centrifugation method was used in the present Example, it does not specifically limit to this. For example, the glass fiber may be produced by flame method or continuous filament method, and the material may be ceramic fiber or other inorganic fiber such as rock wool, etc., but it is easy to reduce the diameter, the price, and powder fall off etc. From the point of view, glass fiber is desirable. In addition, although it is possible to use an organic fiber, in consideration of outgassing from the core material, the inorganic fiber is more advantageous in heat insulation performance.

  Next, the manufacturing method of the glass fiber aggregate which is a core material used by a present Example is demonstrated. As the core material, glass fibers fiberized by centrifugation are introduced into a dispersion medium, which is an aqueous solution that facilitates dispersion of the fibers, and the glass fibers are divided by mixing and stirring. Then, a predetermined amount of the aqueous solution which has been made into a slurry form by dispersing the glass fibers is scooped up on a mesh conveyor, and after making into paper in a manner of papermaking, a sheet-like glass fiber aggregate is obtained.

  In this embodiment, the aqueous solution in the form of a slurry is allowed to flow substantially perpendicularly to the advancing direction of the mesh conveyor at the time of paper making, and the deviation of the glass fiber direction in the advancing direction of the mesh conveyor is suppressed. It was distributed to In addition, according to the advancing speed of a mesh conveyor, adjustment of the flow direction of slurry-like aqueous solution is required.

  Although the sulfuric acid aqueous solution adjusted to pH 3.0 to 3.5 was used as the aqueous solution of the dispersion medium in the present embodiment, the present invention is not limited to this, and any acidic solution adjusted to PH can be used without any problem in safety It is. Moreover, you may use the solution from which pH differs, and a commercially available fiber dispersing agent. In the present embodiment, by using a sulfuric acid aqueous solution as a dispersion medium, needle crystals containing a sulfur component adhere to a part of the surface of the glass fiber as shown in FIG. The needle crystals reduce the contact area between the glass fibers and suppress the heat conduction along the glass fibers, which is advantageous in heat insulation performance.

  On the other hand, the free thickness of the sheet-like glass fiber assembly becomes thicker compared to the basis weight, and in the case of laminating a plurality of sheets, it is accumulated. For example, in the case of producing a vacuum heat insulating material having a thickness of 18 mm, when the weight per unit area is 120 g / m 2, 30 to 40 sheets of fiber assembly are to be laminated, and the apparent bulk density is increased. Therefore, it may be difficult to store the core material in the outer packaging material. In such a case, it is possible to improve the workability by using an inner bag.

  As the inner bag, for example, a high density polyethylene film in the shape of a three-sided bag can be used, which can be heat-welded, and the core is compressed while the core is stored in the inner bag, and the core is deaerated By heat-sealing the inner bag and maintaining the compressed state of the core material, it is possible to improve the workability of storing in the outer packaging material. After storing in the outer packaging material, the inner bag is opened before evacuation of the inside of the outer packaging material, and after the pressure is reduced including the inside of the core material, the outer packaging material is thermally welded and sealed to obtain a vacuum heat insulating material. .

  The inner bag is not limited to the above-mentioned three-sided bag-like high density polyethylene film, and the material is polypropylene, polyethylene other than high density, polyethylene terephthalate, polyethylene terephthalate, etc., low hygroscopicity, heat welding possible, outgassing It can be used if it has a small amount of compression, and compression is performed in a state where the core material is disposed between two sheets of film even if it is not in the form of a bag, and heat sealing is performed on all sides to seal and hold the compression state. It is also possible.

  In addition, although it is possible to solidify the core material using a binder to improve the storage workability in the outer packaging material, it is desirable to avoid the use as much as possible from the viewpoint of the heat insulation performance of the vacuum heat insulating material. Even when the binder is used, the use amount is as small as possible, and the influence of the decrease in the bending property using the fibrous binder which is more solid than the liquid binder which tends to easily gather at the contact point between fibers by capillary phenomenon and enlarge the contact area. However, care must be taken such as using a small organic binder compared to the inorganic binder.

  Although the fiber diameter is not limited to a specific range, a smaller diameter is better in heat insulation performance from the viewpoint of heat conduction suppression of the gas and a vacuum heat insulating material superior in heat insulation performance is obtained. An average fiber diameter of about 2 to 5 .mu.m is desirable in consideration of becoming lower.

  Next, the outer packaging material 43 will be described. The laminated structure of the outer packaging material may have gas barrier properties and may be capable of heat welding. In the present embodiment, it is a laminate film having a four-layer structure of a surface protective layer, a first gas barrier layer, a second gas barrier layer, and a heat welding layer.

  The surface layer is a resin film having a role of a protective material. The first gas barrier layer is a resin film provided with a metal deposition layer. The second gas barrier layer is obtained by providing a metal deposition layer on a resin film having high oxygen barrier properties. The metal vapor deposition layers of the first gas barrier layer and the second gas barrier layer are bonded to each other.

  The heat welding layer is a low hygroscopic film similar to the surface layer. Specifically, the surface layer is a film of biaxial stretching type polypropylene, polyamide, polyethylene terephthalate, etc., the first gas barrier layer is a biaxial stretching ethylene terephthalate film with aluminum deposition, and the second gas barrier layer is a biaxial with aluminum deposition. A stretched ethylene-vinyl alcohol copolymer resin film, a biaxially stretched polyvinyl alcohol resin film with aluminum deposition, an aluminum foil, and a heat welding layer were used as films of polyethylene, polypropylene and the like.

  The layer configuration and the material of the outer wrapping material 43 are not particularly limited thereto. For example, as the first and second gas barrier layers, a metal foil, a resin-based film provided with a gas barrier film such as an inorganic layered compound, a resin-based gas barrier coating material such as polyacrylic acid, or DLC (diamond like carbon) As the thermal welding layer, a polybutylene terephthalate film or the like having high oxygen barrier properties may be used.

  Although the surface layer is a protective material for the first gas barrier layer, it is desirable to use a resin with low hygroscopicity in order to improve the vacuum evacuation rate in the process of manufacturing the vacuum heat insulating material. In addition, the gas barrier properties of the resin-based film disposed in the second gas barrier layer are significantly deteriorated due to moisture absorption, so a low hygroscopic resin is disposed also in the heat-welded layer to suppress the deterioration of the gas barrier properties and suppress the moisture absorption of the entire laminate film. It is preferable to do.

  In this way, by reducing the carried-in water amount at the time of evacuating the outer packaging material 43, it is possible to improve the evacuating efficiency and to improve the heat insulating performance of the vacuum heat insulating material. Bonding of each film is generally performed by a dry lamination method using a two-component curable urethane adhesive, but the type and bonding method of the adhesive are not limited, and wet lamination, thermal lamination Various methods such as law can be selected.

  Next, the adsorbent 46 will be described. The adsorbent in the present example is a physical adsorption type granular synthetic zeolite, but is not limited thereto. As the adsorbent, if it adsorbs water or gas, activated carbon, activated alumina, silica gel, dawsonite, physically adsorbed adsorbent such as hydrometal is also an alkali metal, alkali earth metal or oxides thereof It is also possible to use chemisorbent-type adsorbents such as sodium hydroxide and the like.

  Next, the shape of the adsorbent storage unit 45 will be described with reference to FIGS. 4A to 4C. In the embodiment shown in FIG. 1, the adsorbent storage portion 45 is formed by the round and square annular bonding line portion 47, but the adsorbent storage portion 45 can adopt various shapes.

  In FIG. 4A, the bonding line portion 47A is formed in an “L” shape in which two sides intersect at about 90 °, and the adsorbent 46 is stored and arranged in the corner of the “L” shape. It is a thing.

  Further, in FIG. 4B, the bonding line portion 47B is formed in a "U" shape in which each of the three sides crosses about 90 °, and the adsorbent 46 is housed and arranged in the "U" shape. It is being done.

  Further, in FIG. 4C, the bonding line portion 47C is formed in a quadrangular shape in which each of the four sides crosses at about 90 °, and the adsorbent 46 is accommodated and disposed in the inside of the quadrangle.

  Furthermore, in addition to this, it is also possible to change each side of FIGS. 4A to 4c into an arc shape, and further, it is also possible to make the shape such as an ellipse or a circle. In any case, the two sheets 41 are partially joined in a predetermined area of the two opposing surfaces of the two sheets 41 so that the adsorbent storage unit 45 is formed. It is good if the adsorbent 46 can be stored.

  As described above, according to the present embodiment, a plurality of sheets made of fiber assembly are stacked and combined to form a core material, and an adsorbent storage portion is provided in predetermined regions of two opposing surfaces of at least two sheets. The two sheets are partially joined to form an adsorbent, and the adsorbent is accommodated and disposed in the adsorbent accommodation portion. According to this, the predetermined regions of the two opposing sheets of two sheets are partially joined to form the adsorbent storage portion, and the adsorbent is stored and disposed in the adsorbent storage portion. The adsorbent can be disposed at a predetermined position without reducing the amount, and the decrease in heat insulation performance can be suppressed.

  Next, a second embodiment of the present invention will be described. In the first embodiment, the adsorbent storage portion 45 is formed between two separate sheets 41A and 41B, but the present embodiment is different in that one sheet is bent and used. Here, since the same reference numerals as in the first embodiment indicate the same components, the description will be omitted.

  In FIG. 5, one sheet 41 is bent at an appropriate portion at a bending portion 48 to form two apparently sheets 41A and 41B. Between the two sheets 41A and 41B, the sheets 41A and 41B are connected to each other at a connection line portion 47. Thus, the adsorbent storage portion 45 is formed, and the adsorbent 46 is accommodated and disposed in the inside.

  Also in the present embodiment, one sheet is bent and partially bonded so that an adsorbent storage unit is formed in predetermined areas on two opposing surfaces, and the adsorbent storage unit stores and arranges the adsorbent. did. According to this, the adsorbent can be disposed at a predetermined position without reducing the amount of the core material, and a decrease in heat insulation performance can be suppressed. In addition, how to bend one sheet is not limited to two-fold, and it is also possible to arrange the adsorbent between the sheets by making three-fold or more.

  Next, a third embodiment of the present invention will be described. In the first embodiment, the core material is formed by laminating a plurality of glass fiber aggregates into a sheet, but in the present embodiment, a core material of another material is used except the sheet for containing the adsorbent. . Here, since the same reference numerals as in the first embodiment indicate the same components, the description will be omitted.

  In FIG. 6, an adsorbent 46 is disposed between two adjacent sheets 41A and 41B of the glass fiber assembly. A core 49 other than the glass fiber aggregate sheet such as glass wool, urethane foam and silica powder is disposed outside the sheets 41A and 41B.

  Also in this embodiment, the adsorbent is accommodated and disposed in the adsorbent accommodating portion formed between the two sheets, and further, the core material other than the sheet of the glass fiber aggregate is disposed outside the sheet. Therefore, the adsorbent can be disposed at a predetermined position without reducing the amount of the core material, and a decrease in heat insulation performance can be suppressed.

  Next, a fourth embodiment of the present invention will be described. In the first embodiment, the adsorbent storage portion 45 is formed between the two sheets 41A and 41B, but the present embodiment is different in that three or more sheets are used. Here, since the same reference numerals as in the first embodiment indicate the same components, the description will be omitted.

  In FIG. 7, an adsorbent 46 is disposed between the sheets 41A and 41B of the glass fiber assembly. Further, the adsorbent 46 is disposed between the sheets 41B and 41C of the glass fiber assembly while shifting the storage position. As described above, the plurality of adsorbents 46 are disposed in the stacking direction of the sheet 41, and the adsorption performance is improved.

  Also in the present embodiment, the adsorbent can be disposed at a predetermined position without reducing the amount of the core material, and a decrease in the heat insulation performance can be suppressed.

  Next, a fifth embodiment of the present invention will be described. In the first embodiment, the adsorbent storage portion 45 is formed between the two sheets 41A and 41B, but the present embodiment is different in that a concave portion for storing the adsorption portion is formed between the two sheets. Here, since the same reference numerals as in the first embodiment indicate the same components, the description will be omitted.

  In FIG. 8A, an auxiliary sheet 41C is interposed between two sheets 41A and 41B, and the auxiliary sheet 41C is cut off by the cutout 51 in order to form a recess 20 for containing the adsorbent 46. ing. Further, the cut-off shape is a shape adapted to the shape of the adsorbent 46. Since the recess 50 for storing the adsorbent 46 is formed in the cutout portion 51, positioning of the adsorbent 46 is further facilitated. In this case, three or more sheets are stacked, but two sheets 11 can be used by folding one sheet 1 in half. Further, three sheets 41A, 41B and 41C are simultaneously joined.

  FIG. 8B shows a modification of the fifth embodiment. In FIG. 8B, an auxiliary sheet 41C is interposed between the two sheets 41A and 41B, and the auxiliary sheet 41C is cut at the cutout 51 to form a recess 50 for storing the adsorbent 46. It is cut off. Further, the cut-off shape is a shape adapted to the shape of the adsorbent 46. Furthermore, the auxiliary sheet 41C is cut before reaching the bonding line 17. Therefore, the auxiliary sheet 41C is a small sheet for forming a recess for accommodating the adsorbing material 46 between the sheets 41A and 41B. Since the recessed part 50 for accommodating the adsorption agent 46 is formed in the cut-out part 51 formed in this auxiliary sheet 41C, positioning of the adsorption agent 46 becomes easier. In this case, three or more sheets are stacked before reaching the bonding line portion 47. However, in the bonding line portion 47, the two sheets 41A and 41B are bonded. .

  Also in the present embodiment, the adsorbent can be disposed at a predetermined position without reducing the amount of the core material, and a decrease in the heat insulation performance can be suppressed.

  Next, the configuration of the refrigerator to which the present invention is applied will be described with reference to FIG. 9 and FIG. FIG. 9 is a front view of a refrigerator to which the present embodiment is applied, and FIG. 10 shows an AA cross section of FIG.

  In FIG. 9 and FIG. 10, the refrigerator 10 has storage compartments such as a refrigerator compartment 11, an ice storage compartment 12a, an upper freezer compartment 12b, a freezer compartment 13, a vegetable compartment 14 and the like from the top. As shown in FIG. 1, the front opening of each storage room is configured to be openable and closable by a door, and the cold storage room doors 16a and 6b, the ice storage room door 17a and the upper stage freezing room rotate around the hinges 15 from above. The door 17b, the lower freezer compartment door 18, and the vegetable compartment door 19 are disposed. It should be noted that all the drawers except the cold storage doors 16a and 16b are drawer-type doors, and these drawer-type doors 17 to 19 are configured such that when the doors are pulled out, the containers constituting the respective storage compartments are pulled out together with the doors. is there. In order to seal the refrigerator body 10 on the storage chamber side surface of each door 17 to 19, a packing 20 in which a permanent magnet is embedded is provided, and the packing 20 is provided outside the storage chamber side of each door 17 to 19. It is attached near the periphery.

  Further, a partition heat insulating wall 21 is disposed to partition and insulate between the cold storage room 11 and the ice making room 12a and the upper freezing room 12b. The partition heat insulation wall 21 is a heat insulation wall having a thickness of about 30 to 50 mm, and is made of styrofoam, foam heat insulation material (hard urethane foam), vacuum heat insulation material or the like individually or in combination.

  Since the control temperature zone is the same between the ice making chamber 12a and the upper freezing chamber 12b and the lower freezing chamber 13, the partition member 22 forming the receiving surface of the packing 20 is provided instead of the partition and heat insulating wall to be insulated. .

  A partition and heat insulation wall 23 is provided between the lower freezer compartment 13 and the vegetable compartment 14 to separate and insulate heat, and it is a heat insulation wall of about 30 to 50 mm like the partition heat insulation wall 21. It is made of heat insulating material (hard urethane foam), vacuum heat insulating material, etc. Basically, partition heat insulating walls 21 and 23 are installed at the partitions of rooms having different storage temperature zones such as refrigeration and freezing.

  The heat insulation box 24 which comprises the refrigerator main body 10 is provided with the outer case 25 and the inner case 26, provides the heat insulation part in the space formed by the outer case 25 and the inner case 26, and each storage room in the heat insulation box 24 And heat insulation from the outside. Specifically, the vacuum heat insulating materials 27a, 27b and 27d are disposed in the space between the outer case 25 and the inner case 26, and the foam heat insulating material 24a such as hard urethane foam is provided in the space other than the vacuum heat insulating materials 27a, 27b and 27d. Is filled.

  In addition, a cooler 28 is provided on the back side of the lower freezer compartment 13 to cool each of the refrigerator compartment 11, the freezer compartments 12a and 12b, the lower freezer compartment 13 and the vegetable compartment 14 to a predetermined temperature. The cooler 28 is connected to the compressor 29, the condenser 30, and a capillary tube (not shown) to constitute a refrigeration cycle.

  Above the cooler 28, a blower 31 for circulating the cold air cooled by the cooler 28 into the refrigerator to maintain a predetermined low temperature is disposed.

  Further, partition heat insulating walls 21 and 22 are disposed as heat insulating materials for partitioning the refrigerator compartment 11, the icemaker 12a and the upper freezer compartment 12b, and the freezer compartment 13 and the vegetable compartment 14, respectively. The partition heat insulating walls 21 and 22 are composed of expanded polystyrene 32 and a vacuum heat insulating material 27 C, and the partition heat insulating walls 21 and 22 may be filled with a foamed heat insulating material such as hard urethane foam. It is not limited to the heat insulating material.

  Further, a storage recess 34 for storing an electric component 33 such as a substrate for controlling the operation of the refrigerator 10 and a power supply substrate is formed in a rear portion of the top surface of the heat insulation box 24. A cover 35 is provided to cover the

  The height of the cover 35 is arranged to be substantially the same height as the top surface of the outer box 25 in consideration of the appearance design and the internal volume. Although not particularly limited, when the height of the cover 35 protrudes beyond the top surface of the outer box, it is desirable to be within the range of 10 mm or less.

  Along with this, the storage recess 34 is disposed on the side of the heat insulating material 24 a in a recessed state only by the space for storing the electric component 33, so the internal volume is inevitably sacrificed to secure the heat insulation thickness. Conversely, if the internal volume is made larger, the thickness of the heat insulating material 24a between the housing recess 34 and the inner box 26 becomes thinner, so the vacuum heat insulating material 27a is disposed in the heat insulating material 24a of the housing recess 34 for heat insulation performance. Secure and strengthen.

  Here, the vacuum heat insulating material used in the refrigerator of the present embodiment has the same configuration as that described in the first embodiment, and a plurality of sheets 41 made of fiber aggregates are stacked to form a core material 42 and at least The two sheets 41 are partially joined so that an adsorbent storage unit 45 is formed in predetermined regions on two opposing sides of the two sheets 41, and the adsorbent 46 is stored in the adsorbent storage unit 45. , As arranged configuration. For this reason, the predetermined regions of the two opposing surfaces of the two sheets 41 are partially joined to form the adsorbent storage unit 45, and the adsorbent 46 is stored and disposed in the adsorbent storage unit 45. The adsorbent 46 can be disposed at a predetermined position without reducing the amount of the material 42, and a decrease in heat insulation performance can be suppressed.

  In addition, as described above, the glass fibers constituting the sheet-like glass fiber aggregate are bent due to the random fiber direction and the contact with other fibers due to the presence of needle crystals on the surface. There is a feature that it is easy to process.

  When there is a tendency to be biased in a specific direction in the fiber direction of the glass fiber, it is difficult to bend in an arbitrary direction because a direction which is easy to bend and a direction which is hard to bend are generated. In the absence of needle crystals, the area of contact between the glass fibers is increased to reduce the movable range of the fibers at the time of bending, causing the fibers to break due to bending, deteriorating the heat insulation performance of the vacuum heat insulating material, There is a possibility that the gas barrier property may be deteriorated, leak and the like.

  In this embodiment, the vacuum heat insulating material disposed on the top surface, the bottom surface, and the back surface is bent and formed along the shape of the refrigerator, and the vacuum heat insulating material disposed on the side surface is a refrigerant pipe laid inside the side steel plate. Recesses were provided so as to cover without gaps and were used respectively.

  As described above, by sticking so as not to create a gap between the sticking surface and the vacuum heat insulating material, it is possible to improve the urethane fluidity at the time of urethane foaming, to prevent peeling due to urethane intrusion into the gap, and Improved thermal insulation performance by suppressing the transfer of heat into the refrigerator, reduction in adhesive usage due to increased adhesion efficiency by enhancing the surface shape adhesion between the steel plate and the vacuum thermal insulation material and pressing It also leads to the effect of cost reduction in thinning of the steel plate by lowering the strength.

  As described above, according to the present invention, two or more sheets of glass fiber aggregate are stacked and combined to form a core material, and an adsorbent storage portion is formed in predetermined areas of two opposing surfaces of at least two sheets. The two sheets were partially joined so as to be formed, and the adsorbent was housed and disposed in the adsorbent housing portion.

  According to this, the predetermined regions of the two opposing sheets of two sheets are partially joined to form the adsorbent storage portion, and the adsorbent is stored and disposed in the adsorbent storage portion. The adsorbent can be disposed at a predetermined position without reducing the amount, and the decrease in heat insulation performance can be suppressed.

  The present invention is not limited to the embodiments described above, but includes various modifications. For example, the embodiments described above are described in detail in order to explain the present invention in an easy-to-understand manner, and are not necessarily limited to those having all the configurations described. Also, part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. In addition, with respect to a part of the configuration of each embodiment, it is possible to add, delete, and replace other configurations.

  DESCRIPTION OF SYMBOLS 10 ... Refrigerator, 11 ... Refrigerator room, 12a ... Ice room, 12b ... Upper freezer room, 13 ... Lower freezer room, 14 ... Vegetable room, 15 ... Hinge for door, 16a ... Cold room door, 16b ... Cold room door, 17a ... ice room door, 17b ... upper freezer compartment door, 18 ... lower freezer compartment door, 19 ... vegetable compartment door, 20 ... packing, 21, 23 ... partition insulation wall, 22 ... partition member, 24 ... box, 24a ... insulation Material, 25: Outer box, 26: Inner box, 28: Cooler, 29: Compressor, 30: Condenser, 31: Blower, 40: Vacuum insulation material, 41: Sheet, 42: Core material, 43: Outer packaging material 45: Adsorbent storage part 46: Adsorbent 47: Bonding line part.

Claims (5)

In a vacuum heat insulating material comprising at least a core material made of a glass fiber aggregate and an outer packaging material having a small gas permeability for containing the core material,
Wherein together with glass fiber aggregate sheet formed from the combined superimposed least two or more and the core material, in a predetermined area of the two opposing surfaces of the two sheets from the outer peripheral edge inside said seat, adsorption The adsorbent storage portion is formed in a size that can store the agent, and in the periphery where the adsorbent is located, the two sheets are partially joined at a joining line portion having a predetermined width to form a bag. It is formed, accommodating the adsorbent to the adsorbent housing unit, the vacuum heat insulating material, characterized in that disposed. In the vacuum heat insulating material according to claim 1,
A vacuum heat insulating material characterized in that the core material is formed of a sheet formed entirely of the glass fiber aggregate, or formed of another heat insulating material other than the two sheets. In the vacuum heat insulating material according to claim 2,
The vacuum heat insulating material is characterized in that the adsorbent storage unit is bonded by any of a method of sewing, heat-sealing, bonding, or engaging by needle punching of the two sheets. . The vacuum heat insulating material according to any one of claims 1 to 3.
Between the two sheets, an auxiliary sheet having a cutout for forming a recess for containing the adsorbent is interposed, and is the auxiliary sheet joined together with the two sheets? Alternatively, the auxiliary sheet is cut at the adsorbent side from the joint portion of the two sheets. In a thermal insulation box provided with a foam insulation filled in a space formed by an outer case and an inner case,
The vacuum heat insulating material according to any one of claims 1 to 4 is disposed in the inside of the heat insulating box, and the vacuum heat insulating material is covered with the foam heat insulating material. Insulation box.

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