JP5401258B2 - refrigerator - Google Patents

Description

  The present invention relates to a refrigerator that employs a vacuum heat insulating material as a part of the heat insulating material.

  In recent years, from the viewpoint of protecting the global environment such as prevention of global warming, attention has been focused on reducing carbon dioxide emissions worldwide. Since refrigerators are used throughout the year, reduction of power consumption is strongly demanded. In addition, due to the trend of couples working together and becoming a nuclear family as a recent social background, the need to increase the capacity of refrigerators is increasing due to an increase in the number of households buying food ingredients on weekends. It is increasing.

  For several years ago, in order to save energy, refrigerators have been put on the market in which heat insulation performance is greatly improved by using vacuum insulation together with rigid urethane foam, which is the insulation material of the refrigerator box (housing). A vacuum heat insulating material has a heat insulation performance 10 times or more of a rigid urethane foam, for example.

  As a conventional technique, vacuum heat insulating materials are generally arranged on a flat part on the outer box side of a refrigerator case, for example, in consideration of workability and the like. In some cases, the original heat insulation performance cannot be sufficiently exhibited due to the heat bridge effect of the material. Here, the heat bridge means that the vacuum heat insulating material installed in the refrigerator outer box made of a member having high thermal conductivity such as a steel plate passes through the outer box from a high temperature outside air, and is further shown in FIG. In urethane foam (rigid urethane foam) without passing through the core through the bent part formed at the end of the outer cover material (for example, a film-like material laminated in a multilayer having a metal layer) This refers to the phenomenon of bridging (reversely, the flow from the inside of the refrigerator to the outside air), and is used in the same meaning in the description of the present invention.

  Moreover, as a prior art shown by patent document 1, a vacuum heat insulating material is arrange | positioned to each surface of both sides | surfaces, a top surface, a back surface, a bottom surface, and a front surface, and the coverage of a vacuum heat insulating material is 50% with respect to the surface area of an outer box. Exceeding 80% or less to improve energy saving effect, vacuum insulation material is embedded in hard urethane foam between the outer box and inner box on the surface where the outer box surface area becomes higher than the outside air temperature, and the vacuum insulation material deteriorates over time The example of the refrigerator which is going to hold down is shown.

  In addition, as a prior art disclosed in Patent Document 2, in a case where a polyurethane foam is foam-filled between an outer box and an inner box and a vacuum heat insulating material is embedded, the heat insulating performance is greatly improved and the storage volume efficiency of the storage chamber is increased. In order to improve the above, a refrigerator in which two or more vacuum heat insulating materials are arranged in a stacked manner is shown.

JP 2003-14368 A Japanese Patent Laid-Open No. 2005-147591

  Generally, the heat insulation thickness of the refrigerator is set to a large heat insulation thickness in the freezer compartment where the difference between the temperature range and the outside air temperature is large. Since the rigid urethane foam flows preferentially in a thick portion, that is, a portion having a large space, a density difference occurs only by filling. For this reason, it is necessary to increase the filling amount of the rigid urethane foam so that the density difference due to the difference in heat insulation thickness cannot be made, and there are problems in terms of material cost and environmental consideration.

  Further, as a measure for improving the box heat insulation performance of the refrigerator, it has been common to increase the area of each vacuum heat insulating material to increase the coverage of the vacuum heat insulating material with respect to the outer surface area of the outer box. However, because the size of the refrigerator box cannot be changed greatly due to housing conditions, etc., it is difficult to further increase the coverage of the vacuum heat insulating material, and improvement in heat insulation performance due to the coverage cannot be expected any more. Therefore, it is a challenge to improve both energy saving performance and capacity in the future.

  Moreover, the conventional refrigerator shown also in patent document 1 arrange | positions a vacuum heat insulating material so that it may become an intermediate | middle position of a hard urethane foam heat insulating material by the urethane-made spacer provided in the outer case side. While the size can be increased, the thickness of the hard urethane foam insulation in the freezer compartment is so thick that the heat insulation thickness becomes non-uniform, and as described above, it is hard to eliminate the density difference of the rigid urethane foam. The amount of use (filling) of urethane foam had to be increased. Moreover, since the vacuum heat insulating material is arranged by the spacer so as to keep a certain distance from the inner surface of the outer box, the amount of use (filling) of the hard urethane foam is further increased because of the flow resistance of the hard urethane foam, There were problems in terms of material costs and environmental considerations.

  Moreover, the conventional refrigerator shown by patent document 2 has piled up two or more vacuum heat insulating materials in the thickness direction, and has improved the heat insulation performance significantly. Although a material having low thermal conductivity is interposed between the vacuum heat insulating materials and is conscious of suppressing the heat bridge of the jacket material, the examples only describe a gas barrier container using an aluminum foil, and the vacuum heat insulating material. Since the end portions of the materials are arranged so as to overlap each other, it is not sufficient in terms of suppressing the heat bridge, and there is much room for improvement. Moreover, although it is described that two or more vacuum heat insulating materials are stacked on the freezer compartment where the temperature difference from the outside air temperature is large, there is no description about the fluidity and filling properties of the rigid urethane foam, and the rigid urethane foam Consideration about the amount of use, ie reduction of material cost and consideration for the environment were insufficient.

  In the refrigerator using the vacuum heat insulating material, the heat insulation thickness is increased in the refrigerator box for the purpose of providing a refrigerator that further saves energy, reduces material costs, and improves environmental considerations. To improve the thermal insulation performance of the refrigerator box while reducing the dimensional difference in the flow space of rigid urethane foam in the refrigerator compartment, freezer compartment, vegetable compartment, etc. It is possible to reduce the amount of use (filling) of rigid urethane foam.

  In order to solve the above problems, the present invention mainly adopts the following configuration.

The heat insulating part between the outer box and the inner box is provided with a foam heat insulating material and a vacuum heat insulating material, and has at least a refrigerator room, a freezer room, and a vegetable room, and the freezer room is sandwiched between the refrigerator room and the vegetable room. in arranged refrigerator Te, the outer box inside surface of the refrigerator side, the first vacuum heat insulating material extending over the vegetable compartment and the freezer compartment and the refrigerating chamber is arranged, wherein the intumescent based thermal thicker portion of material, In the thickness direction of the first vacuum heat insulating material, a second vacuum heat insulating material is arranged in a stacked manner , the second vacuum heat insulating material forms a polygon, and at least the front wall thickness of the heat insulating portion is thin. The portion is arranged at a position shifted so that the end of the second vacuum heat insulating material does not overlap the end of the first vacuum heat insulating material .

  The first and second vacuum heat insulating materials are at least a jacket material made of a multilayer laminate film having gas barrier properties, and a core material in which a flexible fiber assembly is covered with an inner bag made of a synthetic resin film, And at least one of the first and second vacuum heat insulating materials has a metal foil-less outer covering material.

  In the first and second vacuum heat insulating materials, the outermost layer of the outer jacket material has a surface tension of at least 35 (N / m) or more, and the first and second tapes are hot-melt adhesive or double-sided tape. The vacuum heat insulating material is directly bonded.

  According to the present invention, the heat insulation performance is improved by increasing the thickness of the vacuum insulation material in the thick insulation portion such as the freezer compartment, and the flow of the rigid urethane foam in the refrigerator compartment, the freezer compartment, the vegetable compartment, etc. Since the spatial dimensional difference can be reduced, the rigid urethane foam can flow smoothly and can be filled with a reduced density difference. For this reason, it can prevent using hard urethane foam more than necessary, and can provide the refrigerator in which the heat insulation performance was favorable and considered the environment.

  In addition, by arranging the end of the second vacuum heat insulating material and the end of the first vacuum heat insulating material so as not to overlap, the heat bridge effect of the jacket material can be greatly reduced, so the heat insulation performance is further improved It can be made.

  In addition to the above, since at least one surface of the jacket material is made of no metal foil, the effect of heat bridge is further reduced, and a refrigerator with better heat insulation performance can be realized.

It is a front view which shows the external appearance of the refrigerator provided with the vacuum heat insulating material which concerns on Example 1 of this invention. It is a longitudinal cross-sectional view of the refrigerator provided with the vacuum heat insulating material which concerns on Example 1 of this invention, and is the sectional view of the AA line of FIG. It is BB sectional drawing in FIG. 2 of the refrigerator provided with the vacuum heat insulating material which concerns on Example 1 of this invention. It is ZZ sectional drawing in FIG. 1 of the refrigerator provided with the vacuum heat insulating material which concerns on Example 1 of this invention. It is explanatory drawing of the vacuum heat insulating material which concerns on Example 1 of this invention. It is BB sectional drawing in FIG. 2 of the refrigerator provided with the vacuum heat insulating material which concerns on Example 2 of this invention. It is a figure which shows the comparative example 1 of the reference | standard regarding the heat insulation performance which should be contrasted with the Example of this invention.

  A refrigerator provided with a vacuum heat insulating material according to an embodiment of the present invention will be described in detail below with reference to the drawings. The first embodiment of the present invention will be described with reference to FIGS. 1 to 5 and the second embodiment will be described with reference to FIG. FIG. 7 is a diagram showing a comparative example 1 to be compared with the present embodiment.

Example 1
The refrigerator provided with the vacuum heat insulating material which concerns on Example 1 of this invention is demonstrated referring FIGS. 1-5. FIG. 1 is a front view showing an external appearance of a refrigerator provided with a vacuum heat insulating material according to Embodiment 1 of the present invention. FIG. 2 is a longitudinal sectional view of the refrigerator provided with the vacuum heat insulating material according to the first embodiment, and is a sectional view taken along the line AA of FIG. 3 is a cross-sectional view of the refrigerator including the vacuum heat insulating material according to the first embodiment, taken along the line BB in FIG. 4 is a ZZ cross-sectional view of the refrigerator provided with the vacuum heat insulating material according to the first embodiment of the present invention in FIG. 1, and FIG. 5 is an explanatory diagram of the vacuum heat insulating material according to the first embodiment of the present invention.

  As shown in FIG. 2, the refrigerator 1 having the first embodiment shown in FIG. 1 includes a refrigerator room 2, an ice storage room 3 (and a switching room), an upper freezer room 3 b, a lower freezer room 4, and a vegetable room 5 from the top. Have. 1 is a door that closes the front opening of each of the above-described chambers, and all of the doors except the refrigerator compartment doors 6a and 6b and the refrigerator compartment doors 6a and 6b that rotate around the door hinge 10 and the like are pulled out from above. An ice making room 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 6 to 9 are pulled out, the containers constituting each chamber are pulled out together with the doors. Each door 6-9 is provided with a packing 11 for hermetically sealing the refrigerator 1, and is attached to the indoor peripheral edge of each door 6-9. 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. The heat insulating partition 12 is a heat insulating wall having a thickness of about 30 to 50 mm, and is made of a single material or a combination of a plurality of heat insulating materials such as styrofoam, foam heat insulating material (urethane foam), and vacuum heat insulating material. Since the temperature zone is the same between the ice making chamber 3a and the upper freezing chamber 3b and the lower freezing chamber 4, a partition member 13 having a packing 11 receiving surface is provided instead of a partition heat insulating wall for partition heat insulation. Between the lower freezer compartment 4 and the vegetable compartment 5, a heat insulating partition 14 is provided to insulate the compartment, and similarly to the heat insulating partition 12, a heat insulating wall of about 30 to 50 mm, which is also a styrofoam or a foam heat insulating material ( (Urethane foam), vacuum insulation, etc. Basically, partition insulation walls are installed in the partitions of rooms with different storage temperature zones such as refrigeration and freezing. In addition, although the storage room of the refrigerator compartment 2, the ice-making room 3a, the upper stage freezer compartment 3b, the lower stage freezer compartment 4, and the vegetable compartment 5 is each dividedly formed in the box 20, the arrangement | positioning of each storage room is carried out. The invention is not particularly limited 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 are particularly limited in terms of opening and closing by rotation, opening and closing by drawers, and the number of divided doors. is not.

  The box 20 includes an outer box 21 and an inner box 22, and a heat insulating part is provided in a space formed by the outer box 21 and the inner box 22 to insulate each storage chamber in the box 20 from the outside. Yes. A vacuum heat insulating material 50 is arranged on either the outer box 21 side or the inner box 22 side, and a space other than the vacuum heat insulating material 50 is filled with a foam heat insulating material 23 such as hard urethane foam.

  In addition, in order to cool each room such as the refrigerator compartment 2, the upper freezer compartment 3b, the lower freezer compartment 4, and the vegetable compartment 5 to a predetermined temperature, a cooler is provided on the back side of the upper freezer compartment 3b and the lower freezer compartment 4. 28, and the cooler 28, the compressor 30, the condenser 30a, and a capillary tube (not shown) are connected to constitute a refrigeration cycle. Above the cooler 28, a blower 27 that circulates the cool air cooled by the cooler 28 in the refrigerator and maintains a predetermined low temperature is disposed.

  Further, as the heat insulating material for partitioning the refrigerator compartment 2, ice making room 3a and upper freezing room 3b, lower freezing room 4 and vegetable room 5, the heat insulating partitions 12 and 14 are arranged, respectively, and the expanded polystyrene 33 and the vacuum heat insulating material 50 are provided. It consists of The heat insulating partitions 12 and 14 may be filled with a foamable heat insulating material 23 such as rigid urethane foam, and are not particularly limited to the foamed polystyrene 33 and the vacuum heat insulating material 50.

  In addition, an interior light 45 having a case 45a protruding toward the heat insulating material 23 is disposed on a part of the top surface of the inner box 22 so that the interior when the refrigerator door is opened is bright and easy to see. It is. The interior lamp 45 is not particularly limited, such as a light bulb, a fluorescent lamp, a xenon lamp, or an LED (light emitting diode). Since the thickness of the heat insulating material 23 between the case 45a and the outer box 21 becomes thin due to the arrangement of the interior lamp 45, the vacuum heat insulating material 50a is arranged to ensure the heat insulating performance. It is not specified that the interior lamp 45 is arranged in the illustrated position.

  In addition, a concave portion 40 for accommodating an electrical component 41 such as a substrate for controlling the operation of the refrigerator 1 or a power supply substrate is formed in the rear portion of the top surface of the box 20, and a cover 42 that covers the electrical component 41. Is provided. The height of the cover 42 is arranged so as to be substantially the same height as the top surface of the outer box 21 in consideration of appearance design and securing the internal volume. Although it does not specifically limit, when the height of the cover 42 protrudes from the top | upper surface of an outer box, it is desirable to keep in the range within 10 mm. Along with this, the recess 40 is disposed in a state where only the space for housing the electrical component 41 is recessed on the heat insulating material 23 side, so that the internal volume is inevitably sacrificed in order to ensure the heat insulating thickness. If the internal volume is increased, the thickness of the heat insulating material 23 between the recess 40 and the inner box 22 will be reduced. For this reason, the vacuum heat insulating material 50a is arrange | positioned in the surface at the side of the heat insulating material 23 of the recessed part 40, and the heat insulation performance is ensured and strengthened. In Example 1, the vacuum heat insulating material 50a was made into the one vacuum heat insulating material 50a shape | molded by the substantially Z shape so that the case 45a and the electrical component 41 of the above-mentioned interior lamp 45 might be straddled. The cover 42 is made of a steel plate in consideration of a fire from the outside or a case where it is ignited for some reason.

  In addition, since the compressor 30 and the condenser 31 arranged at the lower back of the box 20 are components that generate a large amount of heat, in order to prevent heat from entering the inside of the box, a vacuum insulation is provided on the projection surface toward the inner box 22 side. The material 50b is arranged.

  Here, arrangement | positioning of the vacuum heat insulating materials 50e and 60e in Example 1 is demonstrated with FIG.3 and FIG.4. 3 is a cross-sectional view taken along the line BB in FIG. 2, and FIG. 4 is a cross-sectional view taken along the line ZZ in FIG. In the form of Example 1, as shown in FIG. 3, the vacuum heat insulating material 50 e is provided on the inner surface of the side surface portion of the outer box 21 so as to straddle the refrigerator compartment 2, the ice making compartment 3 a, the upper freezer compartment 3 b, the lower freezer compartment 4, and the vegetable compartment 5. Has been placed. At this time, the space between the ice making chamber 3a, the upper freezing chamber 3b or 4 and the vacuum heat insulating material 50e (the size 23b between the freezer box and the vacuum heat insulating material) is the space of the refrigerating room 2 or the vegetable room 5 (the freezer box). -It is larger than the dimension 23a between vacuum heat insulating materials and the dimension 23c between vegetable indoor boxes and vacuum heat insulating materials. In the present embodiment, the vacuum heat insulating material 60e was directly attached to this portion using a double-sided tape on the vacuum heat insulating material 50e. The attachment of the vacuum heat insulating material 60e may be a hot melt type adhesive or the like instead of a double-sided tape, and is not particularly limited thereto. As for the arrangement of the vacuum heat insulating material 60e, as shown in FIG. 4A, the end portions of the vacuum heat insulating materials 50e and 60e are bonded to each other at a portion where the wall thickness on the front side is thin. As a result, a sufficient flow space of the rigid urethane foam can be secured, and the influence of the heat bridge of the jacket materials 53 and 63 can be reduced. When the end portions of the vacuum heat insulating materials 50e and 60e are overlapped, amplification is caused by overlapping portions where the influence of the heat bridge is large, particularly in the portion where the heat insulation thickness is thin. The heat insulation performance as a box will deteriorate. In this embodiment, since the heat insulation thickness is thick on the back side, the end portions are arranged together, but preferably the end portions of the vacuum heat insulating materials 50e and 60e are arranged as shown in the X and Y portions of FIG. It is better to shift. The influence of the heat insulation of the vacuum heat insulating material depends on the size of the vacuum heat insulating material.

  Next, the structure of the vacuum heat insulating materials 50 and 60 used in Example 1 will be described with reference to FIG. The vacuum heat insulating materials 50 and 60 include core materials 51 and 61, inner packaging materials 52 and 62 for holding the core materials 51 and 61 in a compressed state, and a core material 51 held in a compressed state by the inner packaging materials 52 and 62. , 61 and the outer cover materials 53, 63 having the gas barrier layer and the adsorbents 54, 64. The covering materials 53 and 63 are arranged on both surfaces of the vacuum heat insulating materials 50 and 60, and are configured in a bag shape in which portions of a certain width are bonded together by thermal welding from the ridgeline of the same size laminate film. In Example 1, glass wool having an average fiber diameter of 4 μm was used for the core materials 51 and 61 as a laminate of inorganic fibers not bonded or bound with a binder or the like. The core materials 51 and 61 are advantageous in terms of heat insulation performance because the outgas is reduced by using a laminate of inorganic fiber materials. However, the core materials 51 and 61 are not particularly limited thereto. Inorganic fibers such as glass fibers other than wool and glass wool may be used. Moreover, it does not specifically limit about using an organic fiber. Depending on the type of the core materials 51 and 61, the inner packaging materials 52 and 62 may be unnecessary. The laminate structure of the jacket materials 53 and 63 is not particularly limited as long as it has gas barrier properties and can be thermally welded. In Example 1, the surface layer, the first gas barrier layer, and the second gas barrier layer are used. , A laminated film consisting of four layers of heat-welded layers, the surface layer is a low hygroscopic resin film, the first gas barrier layer is a resin film provided with a metal vapor deposition layer, and the second gas barrier layer is a high oxygen barrier property A metal vapor deposition layer is provided on the resin film, and the first and second gas barrier layers are bonded together so that the metal vapor deposition layers face each other. For the heat-welded layer, a film having low hygroscopicity was used as in the surface layer. Specifically, the surface layer is a biaxially stretched polypropylene, the first gas barrier layer is polyethylene terephthalate with aluminum vapor deposition, the second gas barrier layer is a biaxially stretched ethylene vinyl alcohol copolymer resin film with aluminum vapor deposition, The welding layer was a linear low density polyethylene film. The covering materials 53 and 63 are not particularly limited to this configuration. The surface layer may be polyamide (nylon), polyethylene terephthalate or the like, and the first and second gas barrier layers may be a metal foil or a resin film provided with a gas barrier film such as an inorganic layered compound or a resin gas barrier coating material. . For example, a polybutylene terephthalate film having a high oxygen barrier property, a polypropylene film having a high versatility, a polyethylene film having a high density, a medium density, a low density, or the like may be used for the heat welding layer. Further, the film configuration may be different between the outer box side and the inner box side of each of the vacuum heat insulating materials 50 and 60. For example, there is no problem even if the second gas barrier layer is a combination of an aluminum vapor deposition film on one side and an aluminum foil on the other side. Each layer is bonded by a dry laminating method through a two-component curable urethane adhesive, but the adhesive and the bonding method are not particularly limited thereto.

  The purpose of placing a resin with low hygroscopicity on the surface layer and the heat-welded layer is that the above gas barrier layer film with high oxygen barrier property deteriorates due to moisture absorption. It suppresses the amount of moisture absorption of the entire film. Thereby, also in the vacuum evacuation process of the vacuum heat insulating materials 50 and 60, since the amount of moisture brought in by the jacket materials 53 and 63 is small, the vacuum evacuation efficiency is greatly improved, leading to high performance.

  Moreover, although the polyethylene film which can be heat-welded in Example 1 and the physical adsorption type synthetic zeolite were used for the adsorbents 54 and 64 in the first embodiment, the inner packaging materials 52 and 62 are not limited to these materials. The inner packaging materials 52, 62 may be polypropylene film, polyethylene terephthalate film, polybutylene terephthalate film, etc., as long as they have low hygroscopicity and can be heat-welded and have little outgas, and the adsorbents 54, 64 adsorb moisture and gas. Either physical adsorption or chemical reaction type adsorption may be used.

As the vacuum heat insulating materials 50 and 60 in Example 1 having the above-described configuration, those in which the thickness of the core materials 51 and 61 is set to 15 mm and the density of the core materials 51 and 61 is set to about 250 (kg / m ³ ) are used. As a result, the vacuum heat insulating material 60e is arranged in the thick heat insulation area around the ice making chamber 3a, the upper freezing chamber 3b, and the lower freezing chamber 4, so that the refrigerating chamber 2, the ice making chamber 3a, the upper freezing chamber 3b, the lower freezing When the dimensional difference between the chamber 4 and the vegetable chamber 5 and the vacuum heat insulating material 50e or 60e is reduced, the rigid urethane foam smoothly flows, and the predetermined volume for filling the rigid urethane foam is 100, the actual usage amount is 103. About this, the comparative example 1 mentioned later is compared as a conventional refrigerator. Further, the heat insulating performance of the box body was improved by Example 1, and an energy saving effect of about 2% was obtained compared to the power consumption of Comparative Example 1 described later.

(Comparative Example 1)
The refrigerator of Comparative Example 1 shown in FIG. 7 has a conventional structure without the vacuum heat insulating material 60e in Example 1, and is otherwise the same as Example 1.

  The amount of rigid urethane foam used in Comparative Example 1 was 108 when the predetermined volume was 100. Further, in the present invention, the effects of the respective examples are compared with the power consumption in the present comparative example 1 as the reference value (100).

(Example 2)
The refrigerator of Example 2 shown in FIG. 6 is obtained by partially increasing the thickness of the vacuum heat insulating material 50e in place of the vacuum heat insulating material 60e in Example 1, and otherwise the same as in Example 1. . In Example 2, the amount of rigid urethane foam used was 103, which was the same as Example 1 when the predetermined volume was 100. The box thermal insulation performance was less effective than Example 1, but an energy saving effect of about 1% was obtained with respect to Comparative Example 1.

  The cases where the first and second embodiments of the present invention described above are compared with the comparative example 1 are summarized as follows. Looking at the power consumption of this embodiment and the comparative example, as a result of measuring the power consumption of these refrigerators, when Comparative Example 1 is 100 (index), Example 1 is 98 and Example 2 is 99. It was. In any of the examples, the usage amount of the rigid urethane foam is 103 when the predetermined volume is 100, and the comparative example 1 is 108, so the ratio of using more than the predetermined volume is reduced. Therefore, it was confirmed that the present invention has an energy saving effect and an effect of reducing the amount of rigid urethane foam used, and has a sufficient environmental consideration effect.

  As in the prior art, the heat insulation performance of the box is improved by stacking two or more vacuum heat insulating materials in the thickness direction, but the ends of the vacuum heat insulating materials are overlapped, or the jacket material There were many cases where the heat insulation effect per vacuum heat insulating material could not be sufficiently exhibited, such as the influence of heat bridge. In addition, since there is a difference in the fluidity of the rigid urethane foam between the freezer compartment portion where the heat insulation thickness of the box is thick and other portions, a density difference has conventionally occurred. The present invention not only improves the heat insulating performance by overlapping the vacuum heat insulating material in the heat insulating thickness direction or partially changing the thickness of the vacuum heat insulating material itself, but also the spatial difference in which the rigid urethane foam flows. Since it can be reduced, the density difference of urethane is less likely to occur, and flow rectification can be achieved. In addition, with regard to the superposition of the vacuum heat insulating materials, by preventing the end portions from overlapping each other, it is possible to reduce the heat bridge effect peculiar to the vacuum heat insulating materials, improve the heat insulating performance, and improve the energy saving refrigerator. It can be provided. About the form shown in the present Example, it can apply widely not only to a refrigerator but to the vehicle field | areas, such as a product, apparatus, a house and building which require a heat insulating material, and a motor vehicle or a train.

DESCRIPTION OF SYMBOLS 1 Refrigerator 2 Refrigerating room 3a Ice making room 3b Upper freezing room 4 Lower freezing room 5 Vegetable room 6a, 6b Refrigerating room door 7a Ice making room door 7b Upper freezing room door 8 Lower freezing room door 9 Vegetable room door 10 Door hinge 11 Packing 12 , 14 Heat insulation partition 13 Partition member 20 Box body 21 Outer box 21a Top plate 21b Rear plate 21d Bottom plate 21e Side face 21f Front face 22 Inner box 23 Heat insulation material 23a Refrigeration room box-vacuum heat insulation material dimension 23b Between freezer compartment box and vacuum heat insulation material Dimension 23c Vegetable indoor box-vacuum insulation dimension 27 Blower 28 Cooler 30 Compressor 31 Condenser 33 Expanded polystyrene 40 Recess 41 Electrical component 42 Cover 50, 50a, 50b, 50c, 50d, 50e, 60, 60e Vacuum insulation 51, 61 Core materials 52, 62 Enclosure materials 53, 63 Cover materials 54, 64 Adsorbent

Claims (3)

The insulating section between the outer box and the inner box and a foam-based insulation and the vacuum heat insulating material has at least the refrigerating compartment and the freezing compartment and the vegetable compartment, the freezing compartment is sandwiched between the vegetable compartment and the refrigerating chamber in arranged refrigerator Te, the outer box inside surface of the refrigerator side, the first vacuum heat insulating material extending over the vegetable compartment and the freezer compartment and the refrigerating chamber is arranged, wherein the intumescent based thermal thick portion of the material In the thickness direction of the first vacuum heat insulating material, the second vacuum heat insulating material is arranged in a stacked manner, the second vacuum heat insulating material forms a polygon, and at least the wall thickness on the front side of the heat insulating portion is The thin portion is arranged at a position shifted so that the end of the second vacuum heat insulating material does not overlap the end of the first vacuum heat insulating material . The first and second vacuum heat insulating materials comprise at least a jacket material made of a multilayer laminate film having gas barrier properties, and a core material in which a flexible fiber assembly is covered with an inner bag made of a synthetic resin film. 2. The refrigerator according to claim 1 , wherein at least one of the first and second vacuum heat insulating materials is made of a metal foil-free outer cover material . The first and second vacuum heat insulating materials have a surface tension of at least 35 N / m or more, and the first and second vacuum heat insulating materials are made of hot melt adhesive or two-sided tape. The refrigerator according to claim 1 or 2, wherein the refrigerator is directly bonded .

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