JP5331148B2 - Refrigerator and manufacturing method thereof - Google Patents

Description

  The present invention relates to a refrigerator including a vacuum heat insulation panel in a heat insulation box and a method for manufacturing the same.

  Conventional refrigerators are disclosed in Patent Document 1 and Patent Document 2. In these refrigerators, the housing of the main body is constituted by a heat insulating box filled with a foam heat insulating material between the outer box and the inner box. A heat radiating pipe is provided on the inner surface side of the outer box, and a vacuum heat insulating panel is provided in contact with the heat radiating pipe. Thereby, the heat insulation between the cooling chamber divided by the inner box and the heat radiating pipe can be improved.

  Moreover, the groove part by which a heat radiating pipe is fitted is provided in one surface of a vacuum heat insulation panel. Thereby, protrusion of a heat radiating pipe is prevented, the heat insulation wall of a heat insulation box is formed thinly, and size reduction of a refrigerator can be achieved.

JP 2005-233506 A JP 2011-2033 A

  However, according to the conventional refrigerator described above, the vacuum heat insulation panel has a problem that the thickness of the portion provided with the groove is thin and the heat insulation performance of this portion is lowered. Further, if the groove portion is provided small relative to the cross-sectional shape of the heat radiating pipe, a gap is formed between the vacuum heat insulating panel and the outer box, the heat insulating performance is lowered, and the outer box is deformed by shrinkage when filling with the foam heat insulating material. For this reason, although it is necessary to provide a groove part largely with respect to the cross-sectional shape of a thermal radiation pipe, the extra space was formed between the groove part and the thermal radiation pipe, and there existed a problem that heat insulation performance fell in the groove part vicinity.

  An object of this invention is to provide the refrigerator which can prevent generation | occurrence | production of the appearance defect while preventing the fall of heat insulation performance.

  In order to achieve the above-mentioned object, the present invention includes a heat radiating pipe disposed on the inner surface side of the outer box in a heat insulating box filled with a foam heat insulating material between the inner box and the metal outer box, and a plurality of pipes. In a refrigerator in which a core material laminated with a nonwoven fabric is covered with a jacket material and the inside is decompressed and a vacuum heat insulation panel arranged on the inner box side with respect to the heat radiating pipe is disposed, the nonwoven fabric is obtained by a continuous filament method It is formed into a sheet by a wet papermaking method using a glass fiber having a predetermined length, and the vacuum heat insulating panel is pressed against the outer box through the heat radiating pipe and is attached to the heat radiating pipe by bending. It is characterized in that a groove portion in contact with is formed.

  According to this configuration, most of the glass fibers produced by the continuous filament method extend in a direction substantially parallel to the surface of the nonwoven fabric by the wet papermaking method. Thereby, even if a plurality of nonwoven fabrics are laminated, the presence of glass fibers filling between the plurality of glass fibers is small, and the presence of glass fibers entangled between the plurality of glass fibers is also small. Therefore, the core material in which a plurality of nonwoven fabrics are laminated is excellent in flexibility. For this reason, if a heat radiating pipe is pressed in the lamination direction of a nonwoven fabric, and a vacuum heat insulation panel is affixed on an outer box, a core material will bend easily with respect to a compression direction.

  Moreover, the present invention is characterized in that in the refrigerator configured as described above, the outer cover material has a metal foil at least on the side in contact with the outer box. According to this configuration, the heat of the heat radiating pipe is conducted to the metal foil of the jacket material, spreads in the surface direction, and is radiated to the outer box.

  Moreover, the present invention is characterized in that, in the refrigerator configured as described above, the glass fiber has a length of 3 mm to 15 mm.

  Further, in the refrigerator having the above-described configuration, in the heat insulating box filled with the foam heat insulating material between the inner box and the metal outer box, the heat dissipating pipe disposed on the inner surface side of the outer box, and a plurality of In the manufacturing method of a refrigerator in which a core material laminated with a nonwoven fabric is covered with a jacket material and the inside is decompressed and a vacuum heat insulation panel arranged on the inner box side with respect to the heat radiating pipe is disposed, the nonwoven fabric is continuous It is formed into a sheet shape by a wet papermaking method using glass fibers of a predetermined length created by a filament method, and the vacuum heat insulation panel is pressed against the outer box via the heat radiating pipe and attached, and the above by bending A groove portion in contact with the heat radiating pipe is formed in the vacuum heat insulating panel.

  According to the present invention, the core material is excellent in flexibility, and when the heat radiating pipe is pressed in the lamination direction of the nonwoven fabric, the core material is bent with respect to the compression direction and a groove is formed in the vacuum heat insulating panel. Thereby, the thickness of the part in which the vacuum insulation panel provided the groove part is hard to become thin. Therefore, it can prevent that the heat insulation performance of this part falls. Further, the groove portion and the heat radiating pipe are in contact with each other, and no extra space is formed between the groove portion and the heat radiating pipe. For this reason, it can prevent that heat insulation performance falls near a groove part.

The disassembled perspective view which shows the refrigerator of embodiment of this invention Schematic sectional view of a vacuum heat insulation panel according to the refrigerator of the embodiment of the present invention Schematic which expands and shows the core material which concerns on the refrigerator of embodiment of this invention Top surface sectional drawing which shows a part of heat insulation box which concerns on the refrigerator of embodiment of this invention

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view showing the refrigerator of this embodiment.

  The heat insulating box 10 of the refrigerator has a box shape with an open front. The outer surface of the heat insulation box 10 is formed by the outer box 11, and the inner surface is formed by the inner box 12. The outer box 11 is formed in a box shape having a front surface opened by a top plate 11a made of a metal plate such as an iron plate, a side plate 11b, a back plate 11c, and a bottom plate 11d. The top plate 11a and the side plate 11b connected to both sides of the top plate 11a can be formed by bending a single metal plate.

  The inner box 12 is made of a resin molded product, and is formed by dividing a plurality of cooling chambers 12a, 12b, 12c, 12d, and 12e whose front surfaces are opened. Between the outer box 11 and the inner box 12, a foam heat insulating material 13 such as urethane foam is filled. A heat radiating pipe 33 is attached to the inner surfaces of the side plate 11b and the back plate 11c with a metal foil adhesive tape having an aluminum foil. The heat radiating pipe 33 extends in the vertical direction, bends at the upper and lower ends, and meanders. A vacuum heat insulation panel 21 is disposed on the inner surface side of the heat radiating pipe 33.

  FIG. 2 is a schematic sectional view of the vacuum heat insulation panel 21. The vacuum heat insulation panel 21 encloses the core material 25 in a bag-like outer covering material 26. The jacket material 26 includes a first laminated film 27 and a second laminated film 28. The core material 25 is formed by laminating a plurality of nonwoven fabrics 25c having a thickness of 8 to 16 mm. The inside of the jacket material 26 is decompressed by vacuuming the core material 25 as a spacer, and the end portion 26a is bonded to seal the inside. At this time, the core material 25 is compressed by the reduced pressure inside the jacket material 26 and contacts so that the nonwoven fabrics 25c are pressed against each other. The core material 25 is formed by laminating a plurality of sheet-like nonwoven fabrics 25c formed by a wet papermaking method using glass fibers 25a and 25b (see FIG. 3) having a certain length.

  Moreover, in order to maintain the initial heat insulation performance and the temporal heat insulation performance of the vacuum heat insulation panel 21, it is preferable to use a getter agent such as a gas adsorbent or a moisture adsorbent in the vacuum heat insulation panel 21.

  FIG. 3 is a schematic view showing the core material 25 in an enlarged manner. By forming the nonwoven fabric 25c into a sheet by a wet papermaking method, the plurality of glass fibers 25a forming the upper layer and the glass fiber 25b forming the lower layer extend in a direction substantially parallel to the surface of the nonwoven fabric 25c. It is distributed in a random direction within the plane forming the surface. For this reason, a plurality of glass fibers dispersed in a random direction are not in close contact with each other and aligned in parallel, and most glass fibers are in point contact.

Therefore, even if the nonwoven fabric 25c which comprises the core material 25 is laminated | stacked, there exists little presence of the glass fiber which fills between some glass fibers, and the presence of the glass fiber which becomes entangled between several glass fibers also decreases. Thereby, the core material 25 is excellent in a softness | flexibility, and if the thermal radiation pipe 33 is pressed in the lamination direction of the nonwoven fabric 25c, the core material 25 will deform | transform easily with respect to a compression direction. In addition, the compressive strength of the vacuum heat insulation panel 21 with a thickness of 10 mm is about 1.94 MN / m ² or less in an actual measurement value with a compression depth of 5 mm.

  The glass fibers 25a and 25b are formed by cutting glass fibers formed by a continuous filament method. That is, molten glass is drawn out from a number of nozzles by a continuous filament method to form glass fibers that are continuous filaments. Next, hundreds to thousands of filamentous glass fibers having a uniform thickness are bundled and wound into a strand. In addition, a strand means what cut | disconnected the fixed length to predetermined length with the guillotine cutter etc. Next, the glass fiber strands are further sized and cut into fine needles to obtain glass fibers 25a and 25b that are made into glass chopped strands.

  Since the glass fiber obtained by converting into glass chopped strands is obtained by cutting a continuous filament with a predetermined size into a predetermined length, the straightness is extremely high and the rigidity is high. For this reason, it has a substantially uniform fiber diameter and a substantially circular cross section. According to the continuous filament method, a large number of glass fibers with extremely small variations in fiber diameter can be produced.

  In addition, it is preferable that the glass fiber obtained by making glass chopped strand has 99% or more of the structural ratio of the glass fiber of fiber diameter 3-15 micrometers and fiber length 3-15mm. Glass fibers having a fiber diameter of less than 3 μm have low rigidity. For this reason, when the nonwoven fabric 25c is formed by the wet papermaking method, there is a problem that the fibers are bent and the fibers are entangled with each other.

  When the non-woven fabric 25c is produced by the wet papermaking method, the glass fiber having a fiber length of less than 3 mm is obtained by dispersing the glass fiber located in the upper layer of the glass fiber located in the lower layer already dispersed. Is more likely to be supported at a single point on the underlying glass fiber. For example, it is expected that one end of the upper glass fiber hangs down to the lower layer and the other protrudes in the thickness direction. Thus, when a certain glass fiber is in a form that bridges in the thickness direction between a plurality of glass fibers, heat conduction in the length direction of the glass fibers occurs, and the contact area between the glass fibers is To increase. Thereby, the heat conduction of the nonwoven fabric 25c becomes large, and the heat insulation performance of the core material 25 is deteriorated. For this reason, it is more preferable when the fiber length of the glass fiber which forms the nonwoven fabric 25c is 3 mm or more.

  Further, when the core material 25 is formed by laminating a plurality of nonwoven fabrics 25c using glass fibers having a fiber diameter larger than 15 μm, the number of fiber layers in the thickness direction of the core material 25 is reduced, and the heat transfer path in the thickness direction is reduced. It becomes shorter and the pore diameter becomes larger when the nonwoven fabric 25c is formed. Thereby, the heat insulation performance of the core material 25 is reduced under the influence of the thermal conductivity of the gas. For this reason, it is more preferable when the fiber diameter of the glass fiber which forms the nonwoven fabric 25c is 15 micrometers or less.

  In addition, when glass fibers having a fiber length of more than 15 mm are used, the fiber length is increased with respect to the fiber diameter. For this reason, the rigidity of a fiber falls and it becomes easy to bend, the entanglement of fibers generate | occur | produces and the contact area of fibers increases. Thereby, the heat conduction of the nonwoven fabric 25c becomes large, and the heat insulation performance of the core material 25 is reduced. For this reason, it is more preferable when the fiber length of the glass fiber which forms the nonwoven fabric 25c is 15 mm or less.

  In addition, inorganic fibers other than glass fibers can also be used, and examples thereof include alumina fibers, ceramic fibers, rock wool fibers, and the like. However, the glass fiber is used as the inorganic fiber because the fine fibers necessary for constituting the core material 25 are distributed at a relatively low price due to mass production and the thermal conductivity of the material itself is small. Is preferred.

  The glass fiber composition is not particularly limited, and C glass, D glass, E glass, and the like can be used, but E glass (aluminoborosilicate glass) is preferably employed because of its availability.

  In the wet papermaking method, by adding an appropriate dispersant, the glass chopped strand is formed into a monofilament and dispersed in a layered manner. Thereby, the nonwoven fabric 25c which consists of a glass fiber with very few binding can be obtained. For this reason, the number of glass fibers arranged in parallel is very small, and most glass fibers 25a and 25b are in contact with each other at points between adjacent fibers. Therefore, in the thickness direction, the nonwoven fabric 25c having a very low thermal conductivity while having a high compressive strength can be formed.

  Since the nonwoven fabric 25c is accommodated in the jacket material 26 as the core material 25, the strength as a cloth is not so required. For this reason, as the paper machine for making the nonwoven fabric 25c, an inclined wire type paper machine capable of making paper with a low inlet concentration is suitable. However, in addition to the inclined wire type paper machine, a known paper machine such as a long net paper machine or a short net paper machine can be used.

  An organic binder is used in the paper making process in order to prevent the glass fibers from falling off in the manufacturing process of the non-woven fabric 25c and in order to prevent mold deformation in the processing process. The binder content in the nonwoven fabric 25c is preferably 0.1 to 1.5% by mass or less. In addition, about a binder, it is also possible to use an inorganic binder. However, when an inorganic binder is used, the flexibility of bending of the nonwoven fabric 25c which is a fiber assembly is inferior. Moreover, the cost when using it as a product becomes expensive compared with the case where an organic binder is used. For this reason, it is preferable to use an organic binder. Further, the amount of the binder is suppressed so as not to increase as much as possible.

  As the organic binder, a liquid, fibrous, or granular binder can be used. In general, a liquid binder such as a resin emulsion or an aqueous resin solution is sprayed by spraying and added to glass fibers. Granular or fibrous organic binder is mixed with glass chopped strands. And the nonwoven fabric 25c is formed by the wet papermaking method.

  Examples of the fibrous organic binder include a fibrous material obtained by fiberizing a thermosetting resin, a fibrous material obtained by fiberizing a thermoplastic resin, and a core-sheath structure fiber using a thermoplastic resin. Examples of the thermosetting resin include PVA (polyvinyl alcohol) fiber, uncured or semi-cured phenol resin, acrylic resin, and epoxy resin. Examples of the thermoplastic resin include polyester, unstretched polyester, polypropylene, polyethylene, and ethylene vinyl alcohol. The core-sheath structure fiber is a fiber having components having different melting points in the inner core and the outer sheath and having a low melting point in the outer sheath.

  Moreover, as a granular organic binder, granular PVA, said thermosetting resin, the powder of a thermoplastic resin, etc. are mentioned.

  The liquid organic binder is likely to gather around a portion where a plurality of glass fibers intersect due to surface tension. For this reason, even if the adjacent glass fibers are in contact with each other at a point, the binder may cover the contact portion. As a result, heat conduction through the binder is expected to occur, so a liquid organic binder is not preferable.

  On the other hand, when a non-woven fabric 25c is produced by a wet papermaking method by dispersing and mixing these into a glass chopped strand using a granular binder or a fibrous binder, most of the binder may bridge between the fibers other than the fiber contact point. Conceivable. However, such bridging is extremely delicate and has very little possibility of generating heat conduction. Thereby, since the outstanding heat insulation characteristic of the core material 25 can be maintained, it is preferable to use a granular binder and a fibrous binder as an organic binder.

  Further, the heat insulation performance can be further improved by removing or reducing the organic binder of the core material 25 before vacuum-sealing the outer cover material 26. When a thermosetting resin such as an acrylic resin is used as the binder, it can be removed by using a method based on thermal decomposition.

  That is, before encapsulating the core material 25 in the jacket material 26, by treating at a temperature higher than the thermal decomposition temperature of the binder and lower than the melting point of the glass fiber, only the binder can be removed by thermal decomposition. In addition, when a water-soluble resin such as PVA is used for the binder, the binder can be removed or reduced by washing with warm water in addition to the above method.

The weight of the nonwoven fabric 25c is preferably 50 to 200 g / m ² . When the basis weight of the nonwoven fabric 25c is less than 50 g / m ² , the influence of the thermal conductivity of the gas is increased by increasing the diameter of the voids present in the nonwoven fabric 25c. Thereby, the heat insulation performance of the core material 25 falls. In addition, when the basis weight of the nonwoven fabric 25c is less than 50 g / m ² , the strength of the core material 25 becomes weak. If the non-woven fabric has a basis weight of more than 200 g / m ² , the drying efficiency in producing the nonwoven fabric from the glass fibers is lowered and the productivity is lowered.

  FIG. 4 is a cross-sectional view showing a part of the heat insulating box 10. The jacket material 26 of the vacuum heat insulation panel 21 provided on the inner surface side of the heat radiating pipe 33 is composed of a first laminated film 27 and a second laminated film 28. In the first laminated film 27, a first protective layer 27a and a first adhesive layer 27c are laminated via a first aluminum foil layer 27b. In the second laminated film 28, the second protective layer 28a and the second adhesive layer 28c are laminated via the second aluminum foil layer 28b.

  The first protective layer 27a and the second protective layer 28a are made of nylon or the like, and are arranged on the outermost layer to protect the surface of the jacket material 26. The first adhesive layer 27c and the second adhesive layer 28c are made of polyethylene (HDPE or LLDPE) or the like, and adhere the first laminated film 27 and the second laminated film 28 at the end 26a by heat welding. The first aluminum foil layer 27b and the second aluminum foil layer 28b are made of aluminum foil. The first aluminum foil layer 27b and the second aluminum foil layer 28b may use a metal foil such as a copper foil in addition to the aluminum foil. In addition, the 1st laminated | multilayer film 27 and the 2nd laminated | multilayer film 28 which comprise the jacket material 26 are not limited to 3 layer structure of a protective layer, an aluminum foil layer, and an contact bonding layer. For example, a gas barrier resin (for example, polyethylene terephthalate (PET) or ethylene-vinyl alcohol copolymer (EVOH)) subjected to aluminum vapor deposition may be sandwiched between the first protective layer 27a and the first aluminum foil layer 27b. Thereby, the gas barrier property of the jacket material 26 can be further improved. Moreover, you may provide two layers of gas barrier resin which performed aluminum vapor deposition instead of the aluminum foil layer. Further, the first laminated film 27 and the second laminated film 28 may have a laminated structure of five or more layers.

  The vacuum heat insulating panel 21 is formed with a groove 22 bent along the outer shape of the heat radiating pipe 33 on the first laminated film 27 side. The groove portion 22 extends in the up-down direction, and comes into contact with a heat radiating pipe 33 fitted in the groove portion 22. At this time, the core member 25 is also bent along the outer shape of the heat radiating pipe 33, and the vacuum heat insulating panel 21 is unlikely to have a thin portion where the groove portion 22 is provided. Thereby, the fall of the heat insulation performance by generation | occurrence | production of a thin part can be prevented. The vacuum heat insulation panel 21 contacts the inner surface of the outer box 11 in a region other than the groove portion 22. The first aluminum foil layer 27b has a thickness of 6 μm or more and maintains high gas barrier properties and thermal conductivity. The heat of the heat radiating pipe 33 is thermally conducted from the groove portion 22 to the first aluminum foil layer 27b and spreads in the surface direction of the first aluminum foil layer 27b. Then, heat is conducted from the contact surface between the vacuum heat insulating panel 21 and the outer box 11 to the outer box 11. Thereby, it can prevent that the heat | fever of the heat radiating pipe 33 is locally transmitted to a part of the outer case 11 which adjoins.

  A foam heat insulating material 13 is disposed on the inner box 12 side of the vacuum heat insulating panel 21. Thereby, the heat radiation of the heat radiating pipe 33 is insulated by the vacuum heat insulating panel 21 and the foam heat insulating material 13, and the heat leakage to the inner box 12 is suppressed. Although an aluminum vapor deposition layer may be provided instead of the second aluminum foil layer 28b, it is preferable to use an aluminum foil of 6 μm or more from the viewpoint of preventing vacuum leakage. Further, the first laminated film 27 and the second laminated film 28 are formed as an integral sheet, and the sheet is bent into a bag shape to form the jacket material 26, thereby reducing the cost of the vacuum heat insulating panel 21. Can do.

  The vacuum heat insulating panel 21 is pressed against the inner surface of the outer box 11 through the heat radiating pipe 33 and pasted. At this time, a pressing pressure is applied to the entire surface of the second laminated film 28 while pressing against the inner surface of the outer box 11. As a result, the vacuum heat insulating panel 21 is bent along the outer peripheral shape of the heat radiating pipe 33 to form the groove 22 that contacts the heat radiating pipe 33. Since no extra space is formed between the vacuum heat insulating panel 21 and the heat radiating pipe 33, the groove 22 can be formed to the minimum with respect to the outer peripheral shape of the heat radiating pipe 33. Thereby, the heat of the heat radiating pipe 33 is efficiently conducted to the vacuum heat insulating panel 21.

  Further, by forming the heat radiation pipe 33 to the minimum with respect to the outer peripheral shape, the contact area between the vacuum heat insulation panel 21 and the outer box 11 is increased. Thereby, the heat dissipation effect from the vacuum heat insulation panel 21 to the outer box 11 improves.

  By applying a hot melt adhesive to the inner surface of the outer box 11 or one surface of the vacuum heat insulating panel 21, the vacuum heat insulating panel 21 can be pressed and adhered to the inner surface of the outer box 11. At this time, by using the core material 25 excellent in flexibility, it is possible to prevent the vacuum heat insulation panel 21 from damaging the outer box 11 due to the press pressure and causing the appearance defect on the outer surface of the outer box 11.

  According to this embodiment, most of the glass fibers produced by the continuous filament method extend in a direction substantially parallel to the surface of the nonwoven fabric 25c by the wet papermaking method. Thereby, even if it laminates | stacks the some nonwoven fabric 25c, there is little presence of the glass fiber which fills between several glass fibers, and there is also little presence of the glass fiber entangled between several glass fibers. Therefore, the core material 25 in which the plurality of nonwoven fabrics 25c are laminated is excellent in flexibility. For this reason, when the heat radiating pipe 33 is pressed in the stacking direction of the nonwoven fabric 25 c, the core material 25 is bent with respect to the compression direction, and the groove 22 is formed in the vacuum heat insulating panel 21. Thereby, the thickness of the part in which the vacuum insulation panel 21 provided the groove part 22 is hard to become thin. Therefore, it can prevent that the heat insulation performance of a thin part falls. Further, the groove 22 and the heat radiating pipe 33 are in contact with each other, and no extra space is formed between the groove 22 and the heat radiating pipe 33. For this reason, it can prevent that the heat insulation performance falls in the groove part 22 vicinity.

  Further, since the jacket material 26 has an aluminum foil layer 27b, which is a metal foil, on at least the first laminated film 27 that is in contact with the outer box 11, the heat of the heat radiating pipe 33 is thermally conducted to the first aluminum foil layer 27b. 1 It spreads in the surface direction of the aluminum foil layer 27b. The heat conducted to the first aluminum foil layer 27 b is conducted from the contact surface between the vacuum heat insulating panel 21 and the outer box 11 to the outer box 11. Thereby, the heat of the heat radiating pipe 33 can be transmitted in the surface direction from the first aluminum foil layer 27 b to the outer box 11. Therefore, it is possible to prevent the heat of the heat radiating pipe 33 from being locally transmitted to a part of the adjacent outer box 11 and to improve the heat insulating property of the refrigerator while reducing the cost by reducing the thickness of the outer box.

  In addition, since no extra space is formed between the groove 22 and the heat radiating pipe 33, the contact area between the vacuum heat insulating panel 21 and the outer box 11 increases. Thereby, the heat dissipation effect from the vacuum heat insulation panel 21 to the outer box 11 improves.

  Moreover, it can prevent that the contact area of glass fibers increases by making the length of glass fiber 3 mm or more. Thereby, the heat conduction of the nonwoven fabric 25c does not increase, and the heat insulating performance of the core material 25 can be maintained. Moreover, the rigidity of glass fiber falls and it does not become easy to bend by making the length of glass fiber 15 mm or less. For this reason, it can prevent that the entanglement of fibers generate | occur | produces and it can prevent that the contact area of fibers increases. Thereby, the heat conduction of the nonwoven fabric 25c does not increase, and the heat insulating performance of the core material 25 can be maintained.

  Further, the nonwoven fabric 25c is formed into a sheet by a wet papermaking method using glass fibers having a predetermined length prepared by a continuous filament method, and the heat insulating pipe 33 is formed on the vacuum insulation panel 21 having the core material 25 on which the nonwoven fabric 25c is laminated. The groove 21 in contact with the heat radiating pipe 33 can be easily formed in the vacuum heat insulating panel 21 by being pressed against and attached to the outer box 11.

  According to this invention, it can utilize for the refrigerator provided with the vacuum heat insulation panel in the heat insulation box.

DESCRIPTION OF SYMBOLS 10 Heat insulation box 11 Outer box 12 Inner box 13 Foam heat insulation material 21 Vacuum heat insulation panel 22 Groove part 25 Core material 25a Glass fiber 25b Glass fiber 25c Nonwoven fabric 26 Jacket material 27 1st laminated film 27a 1st protective layer 27b 1st aluminum foil Layer 27c first adhesive layer 28 second laminated film 28a second protective layer 28b second aluminum foil layer 28c second adhesive layer 33 heat dissipation pipe

Claims (3)

In the heat insulation box filled with foam heat insulating material between the inner box and the metal outer box, a heat radiation pipe arranged on the inner surface side of the outer box and a core material in which a plurality of non-woven fabrics are laminated with a jacket material In the refrigerator in which the inside is decompressed and the vacuum heat insulating panel disposed on the inner box side with respect to the heat radiating pipe is disposed, the nonwoven fabric has a fiber diameter of 3 to 15 μm and a fiber length created by a continuous filament method It is formed into a sheet by a wet papermaking method using 3 to 15 mm glass fibers, and most of the plurality of glass fibers forming the upper layer and most of the plurality of glass fibers forming the lower layer are substantially the same as the surface of the nonwoven fabric. Extending in parallel directions and in close contact with each other and not aligned in parallel directions, adjacent glass fibers are point-contacted and dispersed in a random direction within the plane forming the surface of the nonwoven fabric Do Has urchin sequence, the vacuum insulation panel is attached by pressing to the outer box through said radiating pipe, opposite the groove with groove in contact with the radiating pipe by bending of the core material is formed A refrigerator characterized in that a protrusion is formed in the region.   The refrigerator according to claim 1, wherein the outer cover material has a metal foil at least on a side in contact with the outer box. In the heat insulation box filled with foam heat insulating material between the inner box and the metal outer box, a heat radiation pipe arranged on the inner surface side of the outer box and a core material in which a plurality of non-woven fabrics are laminated with a jacket material in the refrigerator of the manufacturing method of arranging a vacuum insulation panel disposed within said box side with respect to the radiating pipe with inside is depressurized over a fiber diameter that created the nonwoven fabric by a continuous filament process is 3~15μm The glass fiber having a fiber length of 3 to 15 mm is formed into a sheet by a wet papermaking method, and a plurality of glass fibers forming the upper layer and a plurality of glass fibers forming the lower layer are formed on the surface of the nonwoven fabric. The glass fibers adjacent to each other are not in alignment with each other in close contact with each other, the adjacent glass fibers are in point contact with each other, and are oriented in a random direction within a plane forming the surface of the nonwoven fabric. Minutes And arranged to, against paste press the vacuum insulation panel to said outer box through said radiating pipe, a projecting portion in a region opposed to the the groove in contact with the radiating pipe groove by bending of the core A method of manufacturing a refrigerator, characterized in that the refrigerator is formed on the vacuum insulation panel.

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