JP2011149624A - Refrigerator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a refrigerator reducing heat bridge effects by a vacuum heat insulating material and improving heat insulating performance by suppressing a urethane foam unfilled part. <P>SOLUTION: In the refrigerator, a foamed heat insulating material (23) and the vacuum heat insulating material (50) are provided between an outer casing (21) and an inner casing (22). The vacuum heat insulating material (50) is a composite heat insulating material (70) beforehand covered with a foamed heat insulating material (72), and at least one face of the composite heat insulating material (70) is bonded to the outer casing (21) or the inner casing (22) and is embedded in the foamed heat insulating material (23). <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a refrigerator.

  Conventionally, in order to save energy, refrigerators have been put on the market in which the heat insulation performance is greatly improved by using a vacuum urethane heat insulating material together with a hard urethane foam as a heat insulating material for the refrigerator case. The vacuum heat insulating material has a heat insulating performance 10 times or more that of rigid urethane foam.

  As a conventional technique, the vacuum heat insulating material is generally arranged in a flat part on the outer box side of the 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. Moreover, since high temperature parts, such as a heat radiating pipe, may be installed on the outer box side, a heat bridge of the jacket material is promoted, and a predetermined effect may not be obtained.

  Here, the heat bridge means that the vacuum heat insulating material installed in the refrigerator outer box made of a member having a high thermal conductivity such as a steel plate passes through the outer box from a high temperature outside air, and further, the vacuum heat insulating 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) The phenomenon of bridging (inversely the flow from the inside of the refrigerator to the outside air).

  Moreover, as a prior art shown by patent document 1, a vacuum heat insulating material is arrange | positioned on each surface of both sides | surfaces, a top surface, a back surface, a bottom surface, and a front surface, and a vacuum heat insulating material is used in the surface where an outer box surface area becomes higher than external temperature. There is shown an example of a refrigerator which is embedded in a rigid urethane foam between an outer box and an inner box to suppress deterioration with time of the vacuum heat insulating material.

  Moreover, as a prior art shown by patent document 2, the vacuum heat insulating material supported by the spacer fixed to the outer box side between an outer box and an inner box is arrange | positioned so that it may not contact an outer box and an inner box. In addition, a refrigerator is shown in which hard urethane foam is filled in the gap between the outer box and the vacuum heat insulating material and between the inner box and the vacuum heat insulating material.

JP 2003-14368 A JP-A-2005-55086

  In general, as a characteristic of a vacuum heat insulating material, when used in a high temperature atmosphere, the heat insulating performance tends to be lower than when used in a low temperature atmosphere. Especially when used in contact with high-temperature parts such as heat-dissipating pipes, there is a risk of reducing the heat insulation performance of the vacuum insulation material. There was a possibility of a significant decrease.

  Moreover, in the structure of the conventional refrigerator shown by patent document 1, although arrange | positioning so that a vacuum heat insulating material may become an intermediate position of a hard urethane foam (foaming urethane) with the urethane-made spacer provided in the outer case side, In order to stabilize the posture of the vacuum heat insulating material, a large number of spacers must be arranged one by one, and there is a problem that the number of assembly steps increases. Moreover, when the spacer is too large, it becomes a factor that hinders the flow of the rigid urethane foam, and when it is too small, there is a problem that the foaming pressure cannot be endured.

  In addition, since the urethane spacer is installed only between the outer box and the vacuum heat insulating material, when the hard urethane foam rises in the foaming direction, if it flows a lot between the outer box and the vacuum heat insulating material due to flow resistance etc., The vacuum heat insulating material is peeled off from the spacer by the foaming pressure, and the vacuum heat insulating material may come into contact with the inner box to generate unfilled parts (voids) of urethane foam. There was a problem.

  Moreover, the conventional refrigerator shown by patent document 2 has the spacer installed between the vacuum heat insulating material and an outer box, the bottom part adhere | attached on a vacuum heat insulating material, and the top part further adhere | attached on the outer box became alternate. However, since the spacers are arranged in parallel with the foaming direction, there is an advantage that urethane is easily filled between the vacuum heat insulating material and the outer box. Since the adhesive surface of the outer box is a divided rectangular surface, the adhesive area is not sufficient and is installed only on the outer box side as in Patent Document 1, for example, between the outer box and the vacuum heat insulating material. In the case where the urethane in the middle rises quickly, the vacuum heat insulating material is peeled off by the foaming pressure of the foamed urethane and comes into contact with the inner box, causing an unfilled portion (void) to occur. .

  In addition, when placing the vacuum heat insulating material on the outer box, it is pressed to stabilize the adhesion, but since the bonding surface of the spacer is an island-shaped rectangular surface, an uneven shape appears on the outer box surface, and the appearance There was a problem with the above appearance.

  Further, as a problem common to Patent Documents 1 and 2, when the thickness of the space between the outer box and the inner box, that is, the so-called heat insulating wall, is reduced by increasing the refrigerator internal volume or the like, a rigid urethane foam (foamed urethane) ), The space between the vacuum heat insulating material and the outer or inner box placed in the middle position becomes narrow, so the flow resistance of the rigid urethane foam increases, and the amount of urethane foam injected exceeds the actual injection volume. There was a problem that it was necessary. In particular, as shown in Patent Document 2, the example in which the heat radiating pipe is disposed between the vacuum heat insulating material and the outer box has a problem that the flow resistance of urethane foam becomes larger.

  In view of the above problems, an object of the present invention is to provide a refrigerator that has an improved heat insulation performance by reducing the heat bridge effect of the vacuum heat insulating material and suppressing an unfilled portion of urethane foam.

  In order to solve the above problems, the present invention provides a refrigerator including a urethane foam heat insulating material and a vacuum heat insulating material between an outer box and an inner box, wherein the vacuum heat insulating material is a composite that is covered with a foam heat insulating material in advance. A heat insulating material is used, and at least one surface of the composite heat insulating material is bonded to the outer box or the inner box and embedded in the urethane foam heat insulating material.

  Further, the composite heat insulating material is arranged in the order of a film-like member or plate-like member, a foam heat insulating material, and a vacuum heat insulating material, and an adhesive is applied to the surface of the film-like member or the plate-like member. Features.

  The film-like member or the plate-like member is a resin material or a metal material having a surface tension of 35 to 70 mN / m.

  Moreover, it has the resin cured layer on the surface of the said foaming type heat insulating material, and apply | coated the adhesive agent to this resin cured layer, It is characterized by the above-mentioned.

  The adhesive is a synthetic rubber-based adhesive and has a coating thickness of 20 to 300 μm.

  Moreover, the said composite heat insulating material has been arrange | positioned ranging over the several surface of the said refrigerator, It is characterized by the above-mentioned.

  Further, in the refrigerator provided with a urethane foam heat insulating material and a vacuum heat insulating material between the outer box and the inner box, and provided with a heat radiating pipe on the inner surface of the outer box, the ridge line of the vacuum heat insulating material is a foam heat insulating material in advance. As a covered composite heat insulating material, a thin plate or thin film heat transfer member is disposed on the surface of the composite heat insulating material to be bonded to the inner surface of the outer box, and the heat transfer member and the heat radiating pipe are in contact with each other. It is characterized by that.

  In addition, the composite heat insulating material has a concave portion in a portion in contact with the heat radiating pipe.

  The vacuum heat insulating material has a jacket material made of a multilayer laminate film having at least 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. The outermost layer film of the material and the inner bag have a surface tension of 35 to 70 mN / m.

  ADVANTAGE OF THE INVENTION According to this invention, the heat bridge influence of a vacuum heat insulating material can be reduced, and the unfilled part of urethane foam can be suppressed, and the refrigerator which heat insulation performance improved can be provided.

It is a front view which shows the external appearance of the refrigerator provided with the vacuum heat insulating material which concerns on the 1st Embodiment of this invention. FIG. 2 is a sectional view taken along line AA in FIG. 1. It is sectional drawing of the composite heat insulating material which concerns on the 1st Embodiment of this invention. It is sectional drawing of the composite heat insulating material which concerns on the 1st Embodiment of this invention. FIG. 3 is a sectional view taken along line XX in FIG. 2. FIG. 3 is a cutaway view taken along line ZZ in FIG. 1. It is sectional drawing of the composite heat insulating material which concerns on the 2nd Embodiment of this invention. It is sectional drawing of the composite heat insulating material which concerns on the 2nd Embodiment of this invention. It is a figure which shows the arrangement structure of the composite heat insulating material which concerns on 2nd Embodiment, and a thermal radiation pipe. It is a figure which shows the comparative example 1. FIG. It is a figure which shows the comparative example 2. FIG.

  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 FIGS. 6 and 7. 8 and 9 are diagrams showing a comparative example to be compared with the present embodiment.

“First Embodiment”
A refrigerator provided with a vacuum heat insulating material according to a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a front view showing an appearance of a refrigerator provided with a vacuum heat insulating material according to the first embodiment 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 cross-sectional view taken along line AA of FIG. 3A and 3B are cross-sectional views of a composite heat insulating material in which the vacuum heat insulating material used in the first embodiment is covered with a foam heat insulating material.

  Moreover, FIG. 4 is a longitudinal cross-sectional view of the refrigerator provided with the vacuum heat insulating material which concerns on 1st Embodiment, and is the sectional view of the XX line of FIG. FIG. 5 is a transverse cross-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 ZZ of FIG. 1.

  The refrigerator 1 provided with this embodiment shown in FIG. 1 has the refrigerator compartment 2, the ice making room 3a, the upper freezer compartment 3b, the lower freezer compartment 4, and the vegetable compartment 5 from the top, as shown in FIG. 1 is a door that closes the front opening of each of the above-mentioned chambers, and all are refrigerator doors except the refrigerator doors 6a and 6b that rotate around the hinge 10 and the like from above. 7a, the upper freezer compartment door 7b, the lower freezer compartment door 8, and the vegetable compartment door 9 are arranged. When these pull-out doors are pulled out, the containers constituting each chamber are pulled out together with the doors. Each door is provided with a packing 11 for sealing with the refrigerator 1 main body, and is attached to the indoor peripheral edge of each door.

  In addition, a heat insulating partition 12 is arranged to insulate the compartment 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 composed of a styrofoam, a foam heat insulating material (foamed urethane), a vacuum heat insulating material, or the like. Is provided. 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 for compartmental heat insulation. The heat insulating partition 14 is a heat insulating wall of about 30 to 50 mm, similar to the heat insulating partition 12, and is made of styrofoam, foamed heat insulating material (foamed urethane), vacuum heat insulating material, or the like. That is, a heat insulating partition is installed in a partition of a room having 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 also particularly limited in terms of opening and closing by rotation, opening and closing by drawer, and the number of divided doors. It is not a thing.

  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 disposed in a space between the outer box 21 and the inner box 22, and a space other than the vacuum heat insulating material 50 is filled with a foam heat insulating material 23 such as urethane foam. The vacuum heat insulating material 50 will be described in detail with reference to FIG. 3, but is used as a composite heat insulating material 70 covered with a foam heat insulating material 72 and the like described later.

  Moreover, in order to cool each room of the refrigerator compartment 2, the ice making room 3a, the upper freezing room 3b, the lower freezing room 4, and the vegetable room 5 to predetermined temperature, the ice making room 3a, the upper freezing room 3b, and the lower freezing room 4 A cooler 28 is provided on the back side.

  A compressor 30 is provided at the lower rear of the box 20. A condenser 31 is provided in the space where the compressor 30 is provided. The refrigeration cycle is configured by connecting the cooler 28, the compressor 30, the condenser 31, and a capillary tube (not shown).

  Above the cooler 28, a blower 27 that circulates the cold air cooled by the cooler 28 in the refrigerator 1 and maintains a predetermined low temperature is disposed. Moreover, the heat insulation partitions 12 and 14 provided as the heat insulating material which partitions 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 are comprised with the foamed polystyrene 33 and the vacuum heat insulating material 50c, respectively. Has been. In addition, about the heat insulation partitions 12 and 14, you may fill with the foam heat insulating materials 23, such as foaming urethane, and it does not specifically limit to the foamed polystyrene 33 and the vacuum heat insulating material 50c.

  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 top surface rear part of the box 20. As shown in FIG. In addition, a cover 42 for covering the electrical component 41 is provided at the top. The height of the cover 42 is arranged so as to be substantially the same 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 the outer case 21, it is desirable to set it 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 side of the foam heat insulating material 23, so that the internal volume is inevitably sacrificed in order to ensure the heat insulation thickness. If the internal volume is made larger, the thickness of the foam heat insulating material 23 between the recess 40 and the inner box 22 becomes thin.

  For this reason, in this embodiment, the composite heat insulating material 70 in which the vacuum heat insulating material 50a is covered with the foam heat insulating material 72 is disposed in the foam heat insulating material 23 of the recess 40 to secure and enhance the heat insulating performance. In the present embodiment, the vacuum heat insulating material 50a is a single vacuum heat insulating material 50a formed in a substantially Z shape so as to straddle the case 45a of the interior lamp 45 and the electrical component 41. Accordingly, the shape of the composite heat insulating material 70 is also substantially Z-shaped.

  The cover 42 is made of a steel plate in consideration of fire resistance. In addition, the composite heat insulating material 70 may be in direct contact with the upper surface 45b of the recess provided in the case 45a. In this case, the composite heat insulating material 70 is positioned and positional deviation is suppressed.

  Moreover, the compressor 30 and the condenser 31 arrange | positioned at the back lower part of the box 20 are components with big heat_generation | fever. Therefore, a vacuum heat insulating material 50d is disposed on the projection surface toward the inner box 22 in order to prevent heat from entering the interior. The vacuum heat insulating material 50d is also in the form of a composite heat insulating material 70 covered with the foam heat insulating material 72.

  Next, the structure of the vacuum heat insulating material 50 will be described with reference to FIGS. 3A and 3B. The vacuum heat insulating material 50 includes a core material 51, an inner packaging material 52 for holding the core material 51 in a compressed state, and an outer jacket material 53 having a gas barrier layer covering the core material 51 held in a compressed state by the inner packaging material 52. , And an adsorbent 54.

  The jacket material 53 is arranged on both surfaces of the vacuum heat insulating material 50, and is configured in a bag shape in which portions of a certain width are bonded together by thermal welding from the ridge line of the same size laminate film. In the present embodiment, it is assumed that the vacuum heat insulating material 50 is covered with the foam heat insulating material 72 in advance, and a sheet material 74 made of a resin material is disposed on the surface to be bonded to the outer box 21, the inner box 22, or the like. Yes. Here, the foam heat insulating material 72 is urethane foam, styrofoam, phenol foam, or the like, but is not particularly limited thereto. The sheet material 74 is a film or a thin plate material such as polypropylene, polyamide, polyethylene terephthalate, or polyethylene.

  The sheet material 74 may be provided with a vapor deposition film such as inorganic or metal, and may be a multi-layer laminate film combined with a metal foil or the like, and is not particularly limited, but the surface of the sheet material 74 (Double-sided) needs to have good adhesiveness with an adhesive or urethane foam. Specifically, the surface tension of the sheet material 74 is preferably 35 to 70 (mN / m). In order to make the surface tension within this range, polyethylene terephthalate, polyamide (nylon), etc. are within this range. Moreover, even if it is polypropylene, polyethylene, etc. which are materials smaller than this range, surface tension can be enlarged by performing a surface treatment. Methods for increasing surface tension include corona discharge, sand blasting that gives fine irregularities, flame treatment that treats high temperatures, ozone treatment that oxidizes the surface, solvent treatment, chemical treatment, and electron beam irradiation. Although there are laws and the like, it is not particularly limited to these methods. In this embodiment, a corona treatment method is used.

  In the present embodiment, glass wool having an average fiber diameter of 4 μm is used as the core material 51 as a laminate of flexible inorganic fibers that are not bonded or bound with a binder or the like. As for the core material 51, outgas is reduced by using a laminate of inorganic fiber materials (on the other hand, in the case of an organic material, gas is generated during evacuation or over time, and this gas is called outgas. ), Which is advantageous in terms of heat insulation performance, but is not particularly limited thereto, and may be ceramic fibers, rock wool, inorganic fibers such as glass fibers other than glass wool, and the like. Depending on the type of the core material 51, the inner packaging material 52 may be unnecessary.

  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 problems such as outgas and heat-resistant temperature are cleared. 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 spun bond method, If it is a fiberization method, it will not ask in particular.

  The laminate configuration of the jacket material 53 is not particularly limited as long as it has gas barrier properties and can be thermally welded. In this embodiment, the surface protective layer, the first gas barrier layer, the second gas barrier layer, It is set as the laminated film which consists of a four-layer structure of a heat welding layer. The surface layer is a resin film that serves as a protective material. The first gas barrier layer is provided with a metal vapor deposition film on a resin film. The second gas barrier layer is provided with a metal vapor deposition film on a resin film having a high oxygen barrier property. The first gas barrier layer and the second gas barrier layer are bonded together so that the metal vapor deposition films 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 film of polypropylene, polyamide, polyethylene terephthalate, the first gas barrier layer is a biaxially stretched polyethylene terephthalate film with an aluminum vapor deposition film, and the second gas barrier layer is an aluminum vapor deposition film. The biaxially stretched ethylene vinyl alcohol copolymer resin film, the biaxially stretched polyvinyl alcohol resin film with an aluminum vapor deposition film, or aluminum foil, and the heat-welded layer were unstretched polyethylene, polypropylene, or other films. The layer structure and material of the four-layer laminate film are not particularly limited to these. For example, as a first gas barrier layer or a second gas barrier layer, a metal foil or a resin-based film is provided with a gas-barrier film made of an inorganic layered compound, a resin-based gas barrier coating material such as polyacrylic acid, or DLC (diamond-like carbon). For example, a polybutylene terephthalate film having a high oxygen barrier property or the like may be used for the heat-bonding layer.

  The surface layer is a protective material for the first gas barrier layer, but a resin with low hygroscopicity is preferably disposed in order to improve the vacuum exhaust efficiency in the manufacturing process of the vacuum heat insulating material. In addition, it is desired that the adhesion or adhesion with the foamed heat insulating material 72 or the like is good. In addition, the resin-based film other than the metal foil used for the second gas barrier layer usually has a gas barrier property that is significantly deteriorated by moisture absorption. While suppressing deterioration of gas barrier property, the moisture absorption amount of the whole laminate film is suppressed. As a result, even in the vacuum evacuation process of the vacuum heat insulating material 50 described above, the amount of moisture brought into the jacket material 53 can be reduced, so that the vacuum evacuation efficiency is greatly improved, leading to higher performance of heat insulation performance. . 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 the present embodiment, the encapsulating material 52 is a polyethylene film that can be thermally welded, and the adsorbent 54 is a physical adsorption type synthetic zeolite, but these are not limited to these materials. The inner packaging material 52 may be a polypropylene film, a polyethylene terephthalate film, a polybutylene terephthalate film or the like that has low hygroscopicity and can be heat-welded and has little outgas, and the adsorbent 54 adsorbs moisture and gas. Either adsorption or chemical reaction type adsorption may be used.

  Next, the refrigerator which concerns on 1st Embodiment is demonstrated using FIG.4 and FIG.5. 4 and 5 show the XX cut surface and the ZZ cut surface in FIG. 2 and FIG. 1, respectively. In the refrigerator 1 according to the first embodiment, among the vacuum heat insulating materials 50 used for the box body 20, the vacuum heat insulating material 50 e, the top surface, the back surface, and the bottom surface disposed on the side surface 21 e of the outer box 21 are respectively the outer box 21. In this example, vacuum heat insulating materials 50 a, 50 b, and 50 d are embedded in the top plate 21 a, the rear plate 21 b, and the inner box 22 approximately in the middle of the foam heat insulating material 23. As for the heat insulating partitions 12 and 14, the vacuum heat insulating material 50c is illustrated in FIG. 2, but the vacuum heat insulating material 50c is not used in the first embodiment. As shown in the figure, there is no problem in heat insulating performance even if the vacuum heat insulating material 50c is used.

  In addition, the vacuum heat insulating material 50 used in the present embodiment has a laminate structure of the covering material 53, the surface layer being a biaxially stretched polypropylene film, the first gas barrier layer being a biaxially stretched polyethylene terephthalate film with an aluminum vapor deposition film, The two-gas barrier layer was a biaxially stretched ethylene vinyl alcohol copolymer resin film with an aluminum vapor deposition film, and the heat-welded layer was an unstretched linear low density polyethylene film. For the core material 51, non-binder glass wool, which is an aggregate of glass fibers having an average fiber diameter of 4 μm, which is an inorganic fiber material, was used. Other materials are as described above.

  Next, the arrangement between the outer box 21 and the inner box 22 in the vacuum heat insulating material according to the first embodiment will be described with reference to FIGS. 4 and 5. When the vacuum heat insulating material 50 shown in FIG. 3 has a rectangular shape (which may be a square or a polygonal shape) when viewed from the thin direction (the vertical direction in the drawing in the example of FIG. 3), 4 consisting of pairs of short sides and long sides. If the edge part of the side is floating from the outer box 21 or the inner box 22, the influence of the heat bridge via the edge part can be avoided. That is, if the end portions on the four sides of the vacuum heat insulating material 50 are in contact with the outer box 21 or the inner box 22, heat conduction through the end portions, so-called heat bridges, occurs and the heat insulating performance decreases. The vacuum heat insulating material 50 needs to be disposed at a substantially intermediate position between the outer box 21 and the inner box 22.

  Therefore, as shown in FIG. 4, FIG. 5 and FIG. 6A, a synthetic rubber-based adhesive hot melt adhesive (not shown) is applied to the sheet material 74, which is the bonding surface of the composite heat insulating materials 70a, 70b, 70e. Adhere to the inner surface of 21a, rear plate 21b, and side surface 21e. At this time, since the vacuum heat insulating material 50 is disposed in a state of being floated from the outer box 21 by the foam heat insulating material 72, the influence of the heat bridge can be suppressed. Similarly, the composite heat insulating material 70d is also disposed in the inner box 22.

  By incorporating the composite heat insulating material 70 in which the vacuum heat insulating material 50 described above is embedded in the refrigerator, the vacuum heat insulating material is installed in a state where the foamed heat insulating material is interposed between the outer box 21 and the inner box 22. As a result, it is possible to avoid the deterioration of the heat insulation performance due to the heat bridge due to the vacuum heat insulating material, and to secure a sufficient flow space of the foamed urethane, so that the generation of unfilled (voids) without impeding the flow of the urethane. Can be prevented.

  As a result of injecting urethane foam after the vacuum heat insulating material has been assembled, the spaces between the composite heat insulating materials 70a, 70b, 70e and the inner box 22 and the spaces between the composite heat insulating material 70d and the outer box 21 are not filled. (Void) part was not confirmed but it confirmed that the foam heat insulating material 23 was filled uniformly.

  As a result of measuring the heat insulation performance of the refrigerator according to the first embodiment, when Comparative Example 1 described later (a configuration example serving as a reference for comparison) is 100 (index), 96 (the smaller the numerical value, the higher the heat insulation performance). It was confirmed that the heat insulation performance was improved by about 4% by disposing the vacuum heat insulating material 50e substantially in the middle of the foam heat insulating material 23.

"Comparative Example 1"
A reference comparative example 1 regarding the heat insulation performance to be compared with the first embodiment will be described with reference to FIG. FIG. 8 is a diagram showing a comparative example 1 of a standard regarding the heat insulation performance to be compared with the embodiment of the present invention, and is a sectional view taken along line XX.

  In the refrigerator shown in Comparative Example 1, in the first embodiment of the present invention, the vacuum heat insulating material 50e on the side surface 21e of the outer box 21 is directly attached to the inner surface of the outer box 21 with a hot melt adhesive as in the conventional technique. The structure was attached. All other specifications are the same as in the first embodiment.

  As a result of filling urethane foam with the above specifications, no unfilled part (void) part was confirmed between the vacuum heat insulating material 50e and the inner box 22, and it was confirmed that the urethane foam was uniformly filled. Although there is no problem in the filling portion effect, the heat insulation performance of the refrigerator of Comparative Example 1 is 100 (index) as described above, which is inferior to the heat insulation performance of the first embodiment.

“Second Embodiment”
Next, a related structure and arrangement structure of the composite heat insulating material and the heat radiating pipe according to the second embodiment will be described with reference to FIGS. 6 and 7. As shown in FIGS. 6A and 6B, the composite heat insulating material 170 used in the second embodiment is obtained by replacing the sheet material 74 of the composite heat insulating material 70 of the first embodiment with a high thermal conductivity material 174. The material having good thermal conductivity is preferably aluminum or copper thin plate or foil, but is not particularly limited thereto. The vacuum heat insulating material 50 used here is the same as in the first embodiment. As shown in FIG. 6A and FIG. 6B, the end portion of the outer covering material 53 of the vacuum heat insulating material 50 may be bent or not bent. As shown in FIG. 7, in order to dispose the composite heat insulating material 170 on the heat radiating pipe 90 affixed to the outer box 21 with the aluminum tape 94, it is necessary to provide a groove 178 in the composite heat insulating material 170. The groove 178 is set according to the diameter of the heat radiating pipe 90. At this time, since the heat of the heat radiating pipe 90 is diffused by the high thermal conductivity material 174 through the aluminum tape 94, the heat intrusion into the cabinet can be suppressed. In 2nd Embodiment, it was set as the same specification as 1st Embodiment except having arrange | positioned the thermal radiation pipe 90 inside the side surface 21e of the outer case 21 of the refrigerator 1, and arrange | positioned the composite heat insulating material 170 in this part. .

  As a result of filling urethane foam with the above specifications, unfilled portions (voids) are confirmed in the spaces between the composite heat insulating materials 70a, 70b, 70e and the inner box 22 and between the composite heat insulating material 70d and the outer box 21. It was confirmed that the foam insulation 23 was uniformly filled.

  As a result of measuring the heat insulation performance of the refrigerator of the second embodiment, it was 96 when Comparative Example 1 was set to 100 (index), and the same effect as Example 1 was obtained.

"Comparative Example 2"
Comparative Example 2 relating to the heat insulation performance to be compared with the above-described second embodiment of the present invention will be described with reference to FIG. In Comparative Example 2, the composite heat insulating material 170 is directly disposed on the heat radiating pipe 90 by providing the composite heat insulating material 170 with the groove 58 in the vacuum heat insulating material 50. The other specifications are the same as those in the first embodiment.

  As a result of filling urethane foam with the above specifications, there are unfilled portions (voids) between the outer box 21 and the vacuum heat insulating material 50, between the inner box 22 and the vacuum heat insulating material 50, and around the heat radiating pipe 90. It was not confirmed, and it confirmed that foaming urethane was filled uniformly. As a result of measuring the heat insulation performance of the refrigerator of Comparative Example 2, it was the same as Comparative Example 1. Moreover, as a result of measuring the heat insulation performance after the passage of one year, an index 107 was shown.

  The case where the first and second embodiments of the present invention described above and the comparative example 1 are compared is summarized as follows. As for the power consumption of this embodiment and the comparative example, as a result of measuring the power consumption of these refrigerators, when the comparative example 1 is 100 (index), the first embodiment is 90, the third embodiment Was 85. About 2nd Embodiment, as a result of arrange | positioning the heat radiating pipe 90, it has confirmed that the amount of power consumption reduced by the effect which heat dissipation improved, and is superior in energy-saving property. Moreover, from the heat insulation performance after 1 year equivalent of 2nd Embodiment and the comparative example 2, when a vacuum heat insulating material and a heat radiating pipe are arrange | positioned adjacently, a heat insulating performance is a vacuum heat insulating material by the heat influence of a heat radiating pipe. Although there is a tendency to get worse, heat insulation is maintained because the degree of thermal influence on the vacuum heat insulating material is reduced by maintaining a certain distance as in the second embodiment and insulating the heat radiating pipe with urethane foam. It can be said that the deterioration with time of performance is suppressed.

  As in the conventional technology, when the spacer is installed only in the outer box and the vacuum heat insulating material is disposed, the vacuum heat insulating material is peeled off by the foaming pressure of the urethane foam, causing problems such as generation of unfilled parts (voids) of urethane. Whereas the frequency of occurrence is high, the refrigerator according to the present embodiment covers the vacuum heat insulating material in advance with a foam-based heat insulating material, and the adhesive is applied to a portion that becomes an adhesive surface with the outer box or the inner box. By placing a film with good adhesiveness with foam and urethane foam, it is possible to arrange by adhesion, and by placing the vacuum insulation away from the outer box and inner box, the heat bridge effect unique to vacuum insulation Therefore, it is possible to provide a refrigerator with good heat insulation performance and high energy saving performance.

  As in this embodiment, by covering the vacuum heat insulating material with the foam heat insulating material in advance, the workability at the time of assembling is drastically improved, and the effect of reducing the cost by reducing the man-hour required for assembling is exhibited. Specifically, when placing a vacuum insulation material as in the conventional example, in the arrangement of spacers and the handling of the vacuum insulation material itself, there was a high rate of occurrence of defects such as scratches and perforations in the vacuum insulation material. By making the vacuum heat insulating material into a composite heat insulating material as in the embodiment of the present invention, the probability of scratching or perforation is greatly reduced, so that the adhesive application work and the pasting work are facilitated.

  In addition, even if a heat radiating pipe is arranged in the projection surface of the vacuum heat insulating material, the heat dissipation characteristics are improved by adopting a spacer with a relief groove that can secure a distance that does not cause the heat insulating performance to deteriorate due to heat. It is possible to provide a refrigerator that can greatly improve energy saving. This embodiment can be widely applied not only to refrigerators but also to products, equipment, houses / buildings, and vehicle fields such as automobiles and trains that require heat insulating materials.

  As described above, the heat insulation effect of the vacuum heat insulating material can be reduced by arranging the vacuum heat insulating material with the foam heat insulating material in advance, and the composite heat insulating material is arranged on the outer box side or the inner box side. Thus, it is possible to provide a refrigerator that can secure a flow space for urethane foam, suppress an increase in the amount of urethane foam used, and reduce the number of work steps during assembly.

DESCRIPTION OF SYMBOLS 1 Refrigerator 12, 14 Heat insulation partition 20 Box 21 Outer box 21a Top plate 21b Rear plate 21d Bottom plate 21e Side surface 21f Front surface 22 Inner box 23 Foam insulation 33 Foam polystyrene 40 Recesses 50, 50a, 50b, 50c, 50d, 50e Vacuum insulation Material 51 Core material 52 Enclosure material 53 Cover material 54 Adsorbent 58, 178 Groove parts 70, 70a, 70b, 70c, 70d, 70e, 170 Composite heat insulating material 72 Foamed heat insulating material 74 Sheet material 90 Heat radiation pipe 94 Aluminum tape 174 High heat Conductive material

Claims (9)

In the refrigerator provided with a urethane foam heat insulating material and a vacuum heat insulating material between the outer box and the inner box,
The vacuum heat insulating material is a composite heat insulating material previously covered with a foam heat insulating material, and at least one surface of the composite heat insulating material is bonded to the outer box or the inner box and embedded in the foamed urethane heat insulating material. Refrigerator.   The composite heat insulating material is arranged in the order of a film-like member or plate-like member, a foam heat-insulating material, and a vacuum heat-insulating material, and an adhesive is applied to the surface of the film-like member or the plate-like member. The refrigerator according to claim 1.   The refrigerator according to claim 1 or 2, wherein the film member or the plate member is a resin material or a metal material having a surface tension of 35 to 70 mN / m.   The refrigerator according to claim 1, further comprising a cured resin layer on a surface of the foamed heat insulating material, and an adhesive applied to the cured resin layer.   The refrigerator according to claim 2 or 4, wherein the adhesive is a synthetic rubber-based adhesive and has a coating thickness of 20 to 300 µm.   The refrigerator according to any one of claims 1 to 5, wherein the composite heat insulating material is disposed across a plurality of surfaces of the refrigerator. In the refrigerator provided with a urethane foam heat insulating material and a vacuum heat insulating material between the outer box and the inner box, and provided with a heat radiating pipe on the inner surface of the outer box,
The vacuum heat insulating material is a composite heat insulating material whose ridgeline is previously covered with a foam heat insulating material, and a thin plate or thin film heat transfer member is disposed on the surface of the composite heat insulating material to be bonded to the inner surface of the outer box, The refrigerator characterized by arrange | positioning so that this heat-transfer member and the said heat radiating pipe may contact.   The refrigerator according to claim 7, wherein the composite heat insulating material has a concave portion in a portion in contact with the heat radiating pipe.   The vacuum heat insulating material has a jacket material made of a multilayer laminate film having at least a gas barrier property, and a core material in which a flexible fiber assembly is covered with an inner bag made of a synthetic resin film. The refrigerator according to any one of claims 1 to 8, wherein the outermost layer film and the inner bag have a surface tension of 35 to 70 mN / m.

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