JP5401422B2 - Vacuum heat insulating material and refrigerator using the same - Google Patents

Description

  The present invention relates to a vacuum heat insulating material and a refrigerator using the same.

  As a background art in this technical field, there is JP-A-2008-64323 (Patent Document 1). In this publication, “a heat insulating box body filled with a foam heat insulating material between an outer box and an inner box, a heat radiating pipe arranged on the inner surface side of the outer box, and a core material is covered with an outer packaging material to reduce the inside. And a vacuum heat insulating panel provided with a groove portion into which a heat radiating pipe is fitted, the vacuum heat insulating panel is formed on the back surface of the surface on which the groove portion is formed so as to face the groove portion and is perpendicular to the longitudinal direction than the groove portion. It is characterized by having a wide protrusion. "

JP 2008-64323 A

  In Patent Document 1, a vacuum-insulated panel that has been evacuated is pressed by an upper mold and a lower mold to form grooves and protrusions into which a heat radiating pipe is fitted. When forming a groove part and a convex part by press work, for example, when dust or the like adheres to the mold during press work, the vacuum heat insulating material may be damaged and leak. Moreover, a core material is cut | disconnected by press work and heat insulation performance falls.

  In addition, since the rear surface of the surface on which the groove portion is formed is opposed to the groove portion and has a convex portion that is wider in the longitudinal direction than the groove portion, the outer packaging material is greatly extended at the convex portion, and cracks and the like are generated. It occurs and reliability decreases.

  Then, an object of this invention is to provide the vacuum heat insulating material which has a recess which accommodates a heat radiating pipe etc., suppressing the fall of heat insulation, and a refrigerator using the same.

  In order to solve the above problems, for example, the configuration described in the claims is adopted. As an example, in a vacuum heat insulating material having a core material of a fiber assembly and an outer bag for storing the core material, and the inside of the outer bag is depressurized, the core material includes a first laminate and a second laminate. A third laminated body and a fourth laminated body at predetermined intervals between the bodies, and the first laminated body and the second laminated body fill between the third laminated body and the fourth laminated body. In this way, a recess is formed on the outer surface of each of the first laminate and the second laminate.

  ADVANTAGE OF THE INVENTION According to this invention, the vacuum heat insulating material which has a recessed part which accommodates a heat radiating pipe etc., suppressing the fall of heat insulation, and a refrigerator using this can be provided.

The front view of the refrigerator which concerns on embodiment of this invention. The longitudinal cross-sectional view (AA sectional drawing of FIG. 1) of the refrigerator which concerns on embodiment of this invention. The schematic sectional drawing of the vacuum heat insulating material which concerns on embodiment of this invention. (A) is explanatory drawing regarding the injection | pouring direction of the foam heat insulating material of a refrigerator, (b) is explanatory drawing regarding the foaming direction of the foam heat insulating material of a refrigerator. (A) is a schematic diagram of the core material raw cotton, (b) is an explanatory drawing of the core material arrangement of the vacuum heat insulating material, (c) is a view of FIG. 5 (b) viewed from the arrow C, (d) is a vacuum heat insulating material. Explanatory drawing regarding a manufacturing process, (e) is a schematic cross section of the vacuum heat insulating material of Example 1. FIG. (A) is core material explanatory drawing of the vacuum heat insulating material of Example 2, (b) is a schematic sectional drawing of the vacuum heat insulating material of Example 2. FIG. Explanatory drawing of arrangement | positioning of the heat radiating pipe which concerns on Example 3, and a vacuum heat insulating material. (A) is core material explanatory drawing of the vacuum heat insulating material of Example 3, (b) is schematic sectional drawing of the vacuum heat insulating material of Example 3, (c) is explanatory drawing of arrangement | positioning of the vacuum heat insulating material of Example 3. .

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. FIG. 1 is a front view of a refrigerator according to the present embodiment, and FIG. 2 is a cross-sectional view taken along the line AA in FIG. Moreover, FIG. 3 shows the cross-sectional schematic of the vacuum heat insulating material of this embodiment. FIG. 4 is an explanatory diagram regarding the injection direction and the foaming direction of the foam heat insulating material of the refrigerator.

  As shown in FIG. 2, the refrigerator 1 includes a refrigerator room 2, an ice making room 3 a, an upper freezer room 3 b, a lower freezer room 4, and a vegetable room 5 from the top. Each storage room includes a door that opens and closes the front opening. The refrigerating room 2 includes rotary refrigerating room doors 6 a and 6 b that rotate about the hinge 10. The doors other than the refrigerator doors 6a and 6b are drawer type doors, and an ice making door 7a, an upper freezer compartment door 7b, a lower freezer compartment door 8, and a vegetable compartment door 9 are arranged. When these drawer-type doors are pulled out, the storage container of each storage room is pulled out together with the door. In each door, a packing 11 for sealing with the refrigerator 1 and closing the opening is attached to the outer edge of each door on the storage chamber side.

  In addition, a heat insulating partition 12 is disposed to partition and insulate between the refrigerator compartment 2, the ice making chamber 3a, and the upper freezer compartment 3b. Moreover, between the lower freezer compartment 4 and the vegetable compartment 5, the heat insulation partition 14 for partition heat insulation is provided.

  Since the ice making chamber 3a, the upper freezing chamber 3b, and the lower freezing chamber 4 have the same temperature zone, a partition member 13 having a receiving surface for the packing 11 is provided instead of a partition heat insulating wall for heat insulating partitioning.

  Insulation partitions are basically installed in the partitions of rooms with different storage temperature zones such as refrigeration and freezing.

  In addition, about the arrangement | positioning of each store room, it does not specifically limit to this. Further, the refrigerator doors 6a and 6b, the ice making door 7a, the upper freezer compartment door 7b, the lower freezer compartment door 8 and the vegetable compartment door 9 may be other than the revolving door or the drawer door as long as they can be opened and closed. The number of door divisions is not particularly limited.

  The box 20 includes an outer box 21 and an inner box 22, and a heat insulating portion is provided in a space formed by the outer box 21 and the inner box 22, thereby insulating each storage chamber in the box 20 from the outside. doing. A vacuum heat insulating material 50 (50a, 50b, 50c, 50d) is disposed in the space between the outer box 21 and the inner box 22, and a foam heat insulating material 23 such as rigid urethane foam is provided in a space other than the vacuum heat insulating material 50. Filled.

  In addition, in order to cool each storage chamber of the refrigerator 1 to a predetermined temperature, the refrigerator temperature chamber (the ice making chamber 3a, the upper freezer chamber 3b, the lower freezer chamber 4) is cooled in the cooler storage chamber 28a. A container 28 is provided. Moreover, the machine room 30a is provided behind the vegetable room 5, and the compressor 30 and the condenser 31 are arrange | positioned in the machine room 30a. The refrigeration cycle is configured by connecting the cooler 28, the compressor 30, the condenser 31, and a capillary tube (not shown) with refrigerant piping.

  Above the cooler 28, there is provided a blower 27 that circulates the cool air cooled by the cooler 28 into each storage chamber of the refrigerator 1 and maintains a predetermined temperature.

  Moreover, the heat insulation partitions 12 and 14 which thermally insulate the refrigerator compartment 2, the ice making room 3a, the upper freezer compartment 3b, the freezer compartment 4 and the vegetable compartment 5 of the refrigerator 1, respectively, include a polystyrene foam 33 and a vacuum heat insulating material 50c. In addition, it does not specifically limit to the foamed polystyrene 33, The foam heat insulating material 23 and vacuum heat insulating materials 50c, such as hard urethane foam, may be sufficient.

  Moreover, the recessed part 40 for accommodating electrical components 41, such as a board | substrate for controlling the driving | operation of the refrigerator 1, and a power supply board, is formed in the upper part wall 21a rear part of the box 20. As shown in FIG. Further, the recess 40 is provided with a cover 42 that covers the electrical component 41. The height of the cover 42 is arranged so as to be almost the same height as the upper surface wall 21a of the outer box 21 in consideration of appearance design and securing of the inner volume. Although it does not specifically limit, when the height of the cover 42 protrudes from the upper surface wall 21a of the outer box 21, it is desirable to keep in the range within 10 mm. Accordingly, the recess 40 is arranged in a state where only the space for storing the electrical component 41 is recessed on the foamed heat insulating material 23 side. Therefore, the inner volume is inevitably sacrificed by the heat insulation thickness. On the other hand, if the inner volume is increased, the heat insulation thickness between the recess 40 and the inner box 22 is reduced. Therefore, in the foam heat insulating material 23, a vacuum heat insulating material 50a bent in a substantially Z shape is disposed along the concave portion 40 of the upper surface wall 21a to secure and enhance the heat insulating performance. The cover 42 is made of a steel plate in consideration of heat resistance.

  Further, a compressor 30 and a condenser 31 that are components that generate large amounts of heat are disposed in the machine room 30a located below the back wall 21b of the box 20. Therefore, in order to prevent heat from entering the storage chamber, a vacuum heat insulating material 50d bent along the shape of the machine chamber 30a is disposed on the bottom wall 21d side.

  Moreover, the vacuum heat insulating material 50b is each arrange | positioned also to the back wall 21b and side wall (not shown) of the box 20, and the heat insulation performance is improved. Furthermore, if the vacuum heat insulating material 50e is arranged on each door together with the foam heat insulating material, the heat insulating performance is further improved.

  Next, the basic structure of the vacuum heat insulating material 50 will be described with reference to FIG. The vacuum heat insulating material 50 includes a core material 51, an inner bag 52 for holding the core material 51 in a compressed state, an outer bag 53 having a gas barrier layer covering the core material 51 held in a compressed state by the inner bag 52, and The configuration includes the adsorbent 54.

  The outer bag 53 is disposed as an outer shell of the vacuum heat insulating material 50, and is configured in a bag shape in which portions having a certain width are bonded together by thermal welding from the ridge line of the same size laminate film.

  As the core material 51, glass wool having an average fiber diameter of 4 μm was used as a laminate of flexible inorganic fibers not bonded or bound with a binder or the like. In addition, since outgas is reduced by using a laminated body of inorganic fiber materials for the core material 51, it is advantageous in terms of heat insulation performance, but is not particularly limited thereto. For example, inorganic fibers such as ceramic fibers, rock wool, and glass fibers other than glass wool may be used. Note that the inner bag 52 may be unnecessary depending on the type of the core material 51.

  Moreover, about the core material 51, an organic resin fiber material other than an inorganic fiber material can be used. In the case of organic resin fibers, there are no particular restrictions on use as long as the use conditions such as the heat-resistant temperature are satisfied. Specifically, it is common to fiberize polystyrene, polyethylene terephthalate, polypropylene, etc. to a fiber diameter of about 1 to 30 μm by a melt blown method or a spunbond method. There is no particular question if it is a conversion method.

  The laminated structure of the outer bag 53 is not particularly limited as long as it has gas barrier properties and can be thermally welded. In this embodiment, at least three layers of a surface protective layer, a gas barrier layer, and a heat welded layer are included. It has a laminated film.

  The surface protective layer is a resin film having a role of protecting the reduced pressure state from an external impact such as piercing.

  The gas barrier layer is formed by providing a metal vapor deposition layer on a resin film, and further providing a metal vapor deposition layer on a resin film having a high oxygen barrier property so as to face each other.

  A film having a low hygroscopic property is used for the heat-welding layer in the same manner as the surface protective layer.

  More specifically, the surface protective layer is a biaxially stretched film of polypropylene, polyamide, polyethylene terephthalate, or the like.

  The gas barrier layer is a biaxially stretched polyethylene terephthalate film with aluminum vapor deposition, a biaxially stretched ethylene vinyl alcohol copolymer resin film with aluminum vapor deposition, a biaxially stretched polyvinyl alcohol resin film with aluminum vapor deposition, or an aluminum foil.

  The heat welding layer is made of unstretched polyethylene or polypropylene.

  Note that the layer structure and materials of the film are not particularly limited to these. For example, as a gas barrier layer, a metal foil or a resin film provided with a gas barrier film made of an inorganic layered compound, a resin gas barrier coating material such as polyacrylic acid, DLC (diamond-like carbon), etc., as a heat welding layer, A polybutylene terephthalate film having a high oxygen barrier property may be used.

  The surface protective layer has a function of protecting the gas barrier layer, but in order to increase the vacuum exhaust efficiency in the manufacturing process of the vacuum heat insulating material, it is preferable to dispose a resin having a low hygroscopic property.

  In addition, the resin barrier film other than the metal foil used for the gas barrier layer is significantly deteriorated in gas barrier properties due to moisture absorption. Therefore, by arranging a resin having low hygroscopicity for the heat-welded layer, it is possible to suppress the deterioration of gas barrier properties and to suppress the hygroscopic amount of the entire laminate film. Thereby, also in the evacuation process of the vacuum heat insulating material 50, since the amount of moisture brought into the outer bag 53 can be reduced, the evacuation efficiency is greatly improved, and the heat insulation performance is improved.

  In addition, the lamination (bonding) of each film is generally performed by a dry laminating method via a two-component curable urethane adhesive, but the type of adhesive and the bonding method are particularly limited to this. It may be based on other methods such as a wet laminating method and a thermal laminating method.

  Further, in this embodiment, the inner bag 52 is a heat-weldable polyethylene film, and the adsorbent 54 is a physical adsorption type synthetic zeolite, but these are not limited to these materials. As an example, the inner bag 52 may be a polypropylene film, a polyethylene terephthalate film, a polybutylene terephthalate film, etc., as long as it has a low hygroscopic property and can be heat-welded and has a low outgas. Thus, either physical adsorption or chemical reaction type adsorption may be used.

  Next, a method for foaming the rigid urethane foam will be described with reference to FIG. As shown in FIG. 4A, hard urethane foam (foam insulation 23) is injected from the urethane injection hole 25 provided in the back wall 21b of the outer box 21 into the outer box front face 21f as in the injection direction 23a. Thereafter, as shown in FIG. 4 (b), the rigid urethane foam starts to foam and fills the outer box 21 as it rises in the foaming direction 23b on the back wall 21b side.

  Here, Example 1 of the present invention will be described with reference to FIG. FIG. 5 is a diagram for explaining the vacuum heat insulating material of this embodiment and the manufacturing process thereof. FIG. 5 (a) is a schematic view of the core material raw cotton, and shows the core material raw cotton wound in a roll shape cut at a broken line portion to have a predetermined dimension. FIG.5 (b) is core material explanatory drawing of a vacuum heat insulating material, Comprising: It is side surface sectional drawing which shows the state which accommodated the several core material cut | disconnected by Fig.5 (a) in the inner bag. FIG. 5C is a view of FIG. FIG.5 (d) is explanatory drawing regarding the manufacturing process of a vacuum heat insulating material, Comprising: It is a figure explaining a welding process. FIG.5 (e) is a schematic sectional drawing of a vacuum heat insulating material.

  First, as shown to Fig.5 (a), the laminated body of the inorganic fiber created beforehand by roll shape in thickness 100mm-150mm is cut, and it is set as the some core material 51a-51d. In this embodiment, the core material 51a and the core material 51d are used as the outermost layers, and the core material 51b and the core material 51c are arranged at an interval of 50 mm in the intermediate layer and stored in the inner bag 53a. The inner bag 53a is a polyethylene synthetic resin film having a thickness of about 20 μm.

  At this time, the core material 51b (third laminated body) having an area smaller than the core materials 51a and 51d between the core material 51a (first laminated body) and the core material 51d (second laminated body) of the outermost layer. ) And the core material 51c (fourth laminated body). The core members 51b and 51c are arranged between the core members 51a and 51d with a predetermined interval.

  That is, since the intermediate layer core materials 51b and 51c are sandwiched between the outermost layer core materials 51a and 51d when stored in the inner bag 52a, the position of the core material 51 is not shifted, and the interval between the core materials 51b and 51c. Can be stored in the inner bag 52a while maintaining a predetermined interval of 50 mm. At this time, in order to keep a constant interval, a jig may be used to store in the inner bag 52a.

  The core materials 51a to 51d accommodated in the inner bag 52a decompress the inner bag 52a while being compressed by the press machine 55. Next, the entire opening of the inner bag 52a is thermally welded and sealed by the heat welding machine 56, and the core members 51a to 51d stored in the inner bag 52a are positioned so as not to be displaced. Thus, the core material is temporarily compressed. In this state, the core material 51 can be temporarily stored.

  Next, the core material 51 in a temporarily compressed state is stored in the inner bag 52a in the outer bag 53a. Since the core material 51 is compressed, it can be smoothly inserted into the outer bag 53a without damaging the outer bag 53a. Thereafter, when a part of the thermal welding of the inner bag 52a is opened, the core material 51 is released from the compression and spreads outside in the outer bag 53a. In this state, the inside of the outer bag 53a and the inner bag 52a is decompressed, and the openings of the outer bag 53a and the inner bag 52a are welded and sealed, whereby the vacuum heat insulating material 50f is manufactured.

  Thus, the recesses 58a and 58b are formed in the thickness direction of the vacuum heat insulating material 50f through the compression-decompression-welding sealing step. About the structure, the schematic sectional drawing of the vacuum heat insulating material 50f is shown in FIG.5 (c). In the decompression step, the outer bag 53a and the inner bag 52a compress the core material 51 from the outside. At this time, in this embodiment, the core material 51a (first laminated body) and the core material 51d (second laminated body) are compressed from the outside, and the core material 51b (third laminated body) and the core material are compressed. It deform | transforms so that it may enter into the part between 51c (4th laminated body).

  That is, a third laminate (and a fourth laminate) having a smaller area than the first laminate (and the second laminate) is overlapped between the first laminate and the second laminate. When the inside of the jacket material is stored and the inside is decompressed, the first laminate and the second laminate are compressed and deformed so as to fill the space 60a.

  At the time of decompression, the core member 51 is restricted from elastic deformation to spread outward by the outer bag 53a (and the inner bag 52a). And when pressure reduction progresses, the clearance gap which exists between the fibers of the core material 51 reduces gradually, and compresses and deforms from the outer side to the inner side.

  If the core material 51 is a laminated body having substantially the same thickness, the pressure is evenly applied by the reduced pressure, so that the formed vacuum heat insulating material has a flat plate shape.

  On the other hand, in the case of a laminate in which a space 60a exists between the core material 51b and the core material 51c, as shown in FIG. 5C, recesses 58a and 58b are formed on both outer surfaces.

  The recesses 58a and 58b are formed as follows. In a state where the core material 51 is covered with the outer bag 53a and placed in the decompression chamber and decompressed, the pressure inside and outside the outer bag 53a is almost the same, so the thickness of the core material 51 does not change immediately. Thereafter, when the decompression is completed, the opening of the outer bag 53a is welded and sealed, and the inside of the decompression chamber is returned to the atmospheric pressure, the thickness of the core material 51 is compressed due to the pressure difference between the inside and the outside of the outer bag 53a.

  When the entire thickness of the core material 51 is reduced, the fibers are curved so that the layer of the core material 51a and the core material 51d is drawn into the space 60a so as to fill the space 60a between the core material 51b and the core material 51c. It deforms into a shape.

  More specifically, first, pressure is evenly applied by decompression to the core material 51a and the core material 51d that are vertically stacked so as to straddle the core material 51b and the core material 51c arranged at predetermined intervals. Then, compression progresses so that the core material 51a and the core material 51d may fill the gap between the laminated fibers.

  Here, the portion overlapping the core material 51b and the core material 51c is restricted from deformation, but the portion not overlapping the core material 51b and the core material 51c (above and below the space 60a) restricts deformation. There is no state. Then, the core material 51a and the core material 51d enter the space 60a, and fill the space 60a to achieve a stable vacuum state. That is, the deformation of the core material 51a and the core material 51d that have entered the space 60a is restricted by the outer bag 53a and the inner bag 52a, and the internal gas gradually decreases, so that the core material 51a and the core material 51d enter the space 60a. The pressure reduction ends with the entry. Thereby, recesses 58a and 58b are formed in the upper and lower surfaces of the space 60a in the vacuum heat insulating material 50f, respectively.

  In further explanation, the inner bag 52a compresses the core materials 51a to 51d from the outer periphery in a decompression step. At this time, by arranging the core material 51b and the core material 51c with a space 60a of a predetermined interval (about 50 mm) in the intermediate layer, the recesses 58a and 58b are formed on the two outermost layers. More specifically, when the thicknesses of the three layers of the laminated core materials 51a to 51d are arranged to be equal to 100 mm, the total thickness is 300 mm in the laminated state. In the compression-decompression step, compression is performed to a thickness of about 1/20 from 300 mm to 15 mm. Then, recesses 58a and 58b having a depth of approximately 2.5 mm are formed on the outermost layer 2 surface.

  The inner bag 52a has a thickness of about 20 μm, and is thin enough not to form a tent-tensioned space, that is, thin enough to have flexibility and easily deform along the shape.

  In addition, when the core material 51a and the core material 51d try to fill the space 60a by arranging the core material 51b and the core material 51c of the intermediate layer so as to have an inclination on a part or the entire surface of the opposite surfaces, the core Since it becomes easy to follow along the inclination of the material 51b and the core material 51c, the recess can be formed stably.

  Moreover, if the recesses 58a and 58b are located in the vicinity of the injection hole 25 of the foam heat insulating material shown in FIG. 4, the flow of the foam heat insulating material is not hindered. Therefore, it can arrange | position in the state which a vacuum heat insulating material does not become an obstruction in the injection | pouring direction 23a and the foaming direction 23b, and can improve the fluidity | liquidity of a foam heat insulating material.

  Next, Example 2 will be described with reference to FIG. FIG. 6A is an explanatory diagram illustrating the arrangement of the core material of the vacuum heat insulating material according to the second embodiment. FIG. 6B is a schematic cross-sectional view of the vacuum heat insulating material of Example 2.

  Example 2 differs from Example 1 in that the two outermost layers of the core material have different thicknesses. First, the arrangement of the core material will be described.

  In FIG. 6A, the core material 51e, which is the outermost layer, has a thickness of 100 mm, the core material 51h has a thickness of 200 mm, and the intermediate layer core material 51f and the core material 51g are laminated as 100 mm. And the laminated | stacked core material 51 is accommodated in the inner bag 52b. Thereafter, through the compression-decompression-welding sealing step, the recesses 58c, 58d having different depths are formed according to the thickness of the core material of the outermost layer.

  In this embodiment, a recess 58c with a depth of about 1.7 mm is formed on the outer surface of the core material 51e, and a recess 58d with a depth of about 3.3 mm is formed on the outer surface of the core material 51h. Note that the compression-decompression-welding sealing step is the same as that in Example 1, and a description thereof is omitted.

  In the present embodiment, the thickness of the core material 51h is 200 mm. However, two core materials having a thickness of 100 mm may be stacked.

  Recesses 58c and 58d having different depths are formed on the outer surface (upper surface and lower surface) of the vacuum heat insulating material 50g. Here, when the width dimensions of the recesses 58c and 58d are the same, the outer bag is stretched and a greater stress is applied as the depth dimension of the recesses 58c and 58d is larger. Therefore, in the present embodiment, the outer bag 53b on the outer surface of the core material 51h has a larger shrinkage rate than the outer bag 53b on the outer surface of the core material 51e on the other surface (a core material having a smaller thickness than the core material 51h). The outer bag 53b is applied. That is, the outer bag 53b on the side of the recess 58d having a large depth dimension has a larger shrinkage rate than the outer bag 53b on the side of the recess 58c having a small depth dimension, thereby improving the reliability of the outer bag against deformation. Can be secured.

  In addition, the outer bag (in this embodiment, the outer bag 53b on the outer surface of the core material 51h) in which a recess having a large depth dimension is formed and stretched is long, in order to ensure reliability. Thickness may be made thicker than the outer bag 53b on the outer surface of the core material 51e on the surface (the core material that is thinner than the core material 51h and on which the recess having a small depth dimension is formed). .

  It should be noted that the depth dimension ratio of the recesses formed on the two surfaces of the vacuum heat insulating material can be changed by changing the ratio of the thicknesses of the two layers of the core material respectively positioned in the outermost layer. Further, as means for changing the depth of the recess of only one surface, it is only necessary to cut out at least one part of the core material 51e or the core material 51h and adjust the dimension of the space 60b. Further, in order to make the recesses on the two surfaces shallow simultaneously, the thickness of the core material 51f and the core material 51g of the intermediate layer may be reduced.

  Furthermore, since the strength of the core material 51 is increased by increasing the hardness of the core material 51, it is possible to suppress the deformation amount of the core material 51 and reduce the depth of the recess. Further, by increasing the slipperiness of the surface of the core material 51 and reducing the sliding resistance between the outer bag 53b and the inner bag 52b and the core material 51, the deformation amount of the core material 51 is increased and the recess is deepened. Can do.

  Further, the width of the recess can be controlled by adjusting the interval at which the core material 51f and the core material 51g of the intermediate layer are arranged.

  Next, the example which has arrange | positioned the vacuum heat insulating material in which the recess was formed in the refrigerator is shown in FIG. FIG. 7 shows that the vacuum heat insulating material 50b disposed on the back wall 21b of the outer box 21 and the vacuum heat insulating material 50g disposed on the side wall 21e of the vacuum heat insulating material 50 used in the box 20 are contained in the foam heat insulating material 23. It is an example embedded in

  A heat radiating pipe 90 is disposed on the inner surface of the outer box 21e in order to improve the heat dissipation of the refrigerant. The heat radiating pipe 90 is attached to the inner surface of the outer box 21 with an aluminum tape 91. In this embodiment, a heat radiating pipe 90 having a diameter of 4 mm is disposed in a recess having a depth of 4 mm formed in the vacuum heat insulating material 50g.

  As described above, according to the present embodiment, the core material is not cut by press working and the heat insulation performance is not deteriorated. Moreover, it is hard to form a convex part in the back surface of a recess, and it can suppress that a jacket material is extended by a convex part and a crack etc. generate | occur | produce. Therefore, it becomes a vacuum heat insulating material which has a recessed part which accommodates a heat radiating pipe etc., suppressing the fall of heat insulation performance.

  Moreover, if the recess 58c is located in the vicinity of the injection hole 25 of the foam heat insulating material shown in FIG. 4, the flow of the foam heat insulating material is not hindered. Therefore, it can arrange | position in the state which a vacuum heat insulating material does not become an obstruction in the injection | pouring direction 23a and the foaming direction 23b, and can improve the fluidity | liquidity of a foam heat insulating material.

  Next, Example 3 will be described with reference to FIG. FIG. 8A is an explanatory diagram of the core material arrangement of the vacuum heat insulating material according to the third embodiment. FIG. 8B is a schematic cross-sectional view of the vacuum heat insulating material of Example 3. FIG. 8C is an explanatory diagram of the arrangement of the vacuum heat insulating material according to the third embodiment.

  Example 3 differs from Example 1 and Example 2 in that a curved surface is formed at the end of the vacuum heat insulating material. As shown to Fig.8 (a), the core materials 51i-51k are arrange | positioned and the vacuum heat insulating material 50h is manufactured. Since the manufacturing process is as described in the first embodiment, the description thereof is omitted.

  As shown in FIG. 8B, the two layers of the core material 51i (first stacked body) and the core material 51k (second stacked body) located in the outermost layer have different thicknesses. Also, the shape of the end portion is asymmetric at both ends, and the length of the intermediate layer core material 51j (third laminated body) is longer than the two layers of the core material 51i and the core material 51k located in the outermost layer. One end has a short configuration.

  A space 60c is formed in a portion surrounded by the core materials 51i, 51j, and 51k. When the core material 51 is housed in the inner bag 52c in this state and further inserted into the outer bag 53c and decompressed, a curved surface is formed at the end. That is, a curved surface is formed on the outer surface on the core material 51k side by bending the core material 51k so as to be drawn toward the space 60c.

  As described with reference to FIG. 4A, the foam heat insulating material 23 is injected from the injection hole 25 provided in the back wall 21b of the outer box 21 toward the outer box front face 21f as in the injection direction 23a. Thereafter, as shown in FIG. 4B, the foam heat insulating material starts to foam in the foaming direction 23b, rises to the back wall 21b side, and is filled in the outer box 21.

  As shown in FIG. 8 (c), the vacuum heat insulating material 50h is arranged with a tip having a curved shape in consideration of the foaming direction 23b. Therefore, the distance from the inner box 22 is ensured, and the fluidity of the foam heat insulating material can be kept good.

  In the decompression step, the core member is subjected to a pressing force so as to be compressed from the inner bag and the outer bag.

  In this case, when the pressure reduction progresses and the frictional resistance between the core material and the inner bag and between the inner bag and the outer bag increases, it becomes difficult for the core material, the inner bag and the outer bag to slide. Then, tensile stress or compressive stress is applied to the outer bag, and a crack may occur in the gas barrier layer such as a metal vapor deposition layer.

  Therefore, before the decompression process or immediately after the start of decompression, until the middle of decompression, before the frictional resistance between the core material, the inner bag and the outer bag increases, the position where the recess is formed from the outside of the outer bag with a mold or the like. To partially extrude. Thereby, before the frictional resistance is increased, the outer bag is positioned so as to slide in the vicinity of the recess, so that generation of cracks in the gas barrier layer can be suppressed.

  As described above, the refrigerator according to the embodiment of the present invention can form the groove according to the purpose without substantially performing the press forming process using the mold on the vacuum heat insulating material. For this reason, it is possible to provide a refrigerator with good heat insulation performance by suppressing leakage due to foreign matters generated during press molding and deterioration of heat insulation performance due to cutting of the core material. In addition, as in the embodiment of the present invention, by effectively expanding the area of the vacuum heat insulating material, the heat insulating performance can be improved, which contributes to energy saving.

DESCRIPTION OF SYMBOLS 1 Refrigerator 20 Box 21 Outer box 21a Upper surface wall 21b Rear wall 21d Bottom wall 21e Side wall 22 Inner box 23 Foam heat insulating material 23a Injection direction 23b Foaming direction 25 Injection hole 50, 50a-50h Vacuum heat insulating material 51 Core material 51a, 51e , 51i Core material (first laminate)
51b, 51h, 51j Core material (third laminated body)
51c, 51f Core material (fourth laminate)
51d, 51g, 51k Core material (second laminate)
52, 52a to 52c Inner bag 53, 53a to 53c Outer bag 54 Adsorbent 55 Press machine 56 Heat welding machine 58, 58a to 58d Recess 60, 60a to 60c Space 90 Radiation pipe

Claims (7)

In a vacuum heat insulating material having a core material of a fiber assembly and an outer bag for storing the core material, the inside of the outer bag being decompressed,
The core includes a third laminate and a fourth laminate at a predetermined interval between the first laminate and the second laminate,
The first laminated body and the second laminated body are bent so as to fill a space between the third laminated body and the fourth laminated body, and are respectively formed on outer surfaces of the first laminated body and the second laminated body. A vacuum heat insulating material characterized in that a recess is formed.   The second laminate has a thickness dimension larger than that of the first laminate, and the recess formed on the second laminate side is deeper than the recess formed on the first laminate side. The vacuum heat insulating material according to claim 1, wherein the size is large.   The vacuum heat insulating material according to claim 2, wherein the outer bag on the second laminate side has a shrinkage rate larger than that of the outer bag on the first laminate side.   The vacuum heat insulating material according to claim 2, wherein the outer bag on the second laminated body side is thicker than the outer bag on the first laminated body side. In a vacuum heat insulating material having a core material of a fiber assembly and an outer bag for storing the core material, the inside of the outer bag being decompressed,
The core material includes a third laminate between the first laminate and the second laminate,
The third laminated body is shorter in length than the first laminated body and the second laminated body, the second laminated body is bent toward the first laminated body, and the outer surface of the second laminated body A vacuum heat insulating material characterized in that a curved surface is formed. In a refrigerator comprising a vacuum heat insulating material disposed inside an outer box, and a heat radiating pipe disposed between the vacuum heat insulating material and the outer box,
The vacuum heat insulating material has a core material of a fiber assembly, and an outer bag for storing the core material, and depressurizes the inside of the outer bag,
The core includes a third laminate and a fourth laminate at a predetermined interval between the first laminate and the second laminate,
The first laminated body and the second laminated body are bent so as to fill a space between the third laminated body and the fourth laminated body, and are respectively formed on outer surfaces of the first laminated body and the second laminated body. A refrigerator , wherein a recess is formed, and the heat radiating pipe is disposed in any one of the recesses . In a refrigerator comprising a vacuum heat insulating material disposed inside an outer box, and an injection hole for foam heat insulating material provided in the outer box ,
The vacuum heat insulating material has a core material of a fiber assembly, and an outer bag for storing the core material, and depressurizes the inside of the outer bag,
The core member comprises a third laminate between the first laminate and the second laminate,
The third laminated body is shorter in length than the first laminated body and the second laminated body, the second laminated body is bent toward the first laminated body, and the outer surface of the second laminated body A curved surface is formed,
The refrigerator, wherein the curved surface is located in the vicinity of the injection hole .

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