JP2013242123A - Refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a novel refrigerator capable of reducing as much as possible heat leakage to the outside through a door of the refrigerator.SOLUTION: A vacuum heat insulating material 40 having a planar part 40a and a bending part 40b is embedded in a hard urethane foam 18a constructing a door 18 in such a manner that the bending part 40b is positioned at a guide projection part 38 formed at the door 18 and the planar part 40a is positioned at a planar part of the door 18. The planar part of the vacuum heat insulation material whose heat insulation performance is higher than the hard urethane foam is disposed at the planar part of the door while the bending part is bent to a guide projection part side. Thus transfer of heat from the inside of the door to the outside of the door is suppressed, and transfer of the heat from a packing part to the outside between the door and a box body 24 through the guide projection part is suppressed as well, for reducing as much as possible the heat leakage form the door to the outside of the refrigerator.

Description

  The present invention relates to a refrigerator that stores food, drinking water, and the like by refrigeration or freezing, and particularly relates to a refrigerator that improves the heat insulation performance of a door.

As a social effort to prevent global warming, energy conservation is being promoted in various fields in order to control carbon dioxide (CO ₂ ) emissions. In recent years, refrigerators which are electric appliances in recent years, particularly household appliances related to cooling and heating, have improved heat insulation performance from the viewpoint of reducing power consumption.

  For this purpose, a structure that is highly airtight and does not allow the cool air inside the refrigerator to escape to the outside of the refrigerator is indispensable. Here, the fact that the cold air escapes to the outside means that the cold air inside the refrigerator is transmitted to the outside by heat transfer as well as the cold air itself leaks to the outside.

  Generally, a refrigerator is composed of a box that is a refrigerator main body, and a door that opens and closes a front opening of a storage room provided in the box. In order to prevent the cool air inside the refrigerator from escaping to the outside of the refrigerator, it is possible to prevent heat from moving from the gap between the box and the door, or from the door itself that opens and closes the refrigerator storage chamber. It is necessary to suppress the movement of.

  As a method of suppressing the movement of heat from the door, there is a method of embedding a vacuum heat insulating material in the hard urethane foam constituting the door and suppressing the movement of heat from the door. As typical examples, for example, Japanese Patent Application Laid-Open No. 2004-125394 (Patent Document 1) and Japanese Patent Application Laid-Open No. 2011-69560 (Patent Document 2) propose a specific configuration and installation method of a vacuum heat insulating material. ing.

JP 2004-125394 A JP 2011-69560 A

  By the way, in Patent Document 1, in order to secure a wide heat insulating surface, a vacuum heat insulating material is disposed on the uneven surface on the inner plate side of the door, but no vacuum heat insulating material is disposed on the guide protrusion that guides the door. It was. This is probably because heat transfer from the guide protrusion was not assumed, and there was no request to place a vacuum heat insulating material up to the guide protrusion.

  Therefore, since only the rigid urethane foam is filled in the guide projection portion of the door, there is still room for improvement in suppressing heat leakage because the heat insulation performance is inferior to the vacuum heat insulating material.

  Moreover, in patent document 2, the hard urethane foam is made into the door inner board side and the door outer board side by providing the supporting member which supports a vacuum heat insulating material between the door inner board side of a door, and the door outer board side which consists of an iron plate. It can be filled on both sides. Thereby, the vacuum heat insulating material can be arranged without deteriorating the appearance of the door, and the area of the vacuum heat insulating material can also be arranged on the diagonal line, so that the vacuum heat insulating material can be enlarged. .

  However, as in Patent Document 1, it is hard urethane foam that is filled in the guide projections for fixing the door container, and there is still room for improvement in suppressing heat leakage when the door is closed. Is.

  As described above, in Patent Document 1 and Patent Document 2, a vacuum heat insulating material is embedded in the door to prevent heat from leaking from the refrigerator, but no consideration is given to the guide protrusion, and the refrigerator still remains. There was a problem that heat leaked from the door.

  An object of the present invention is to provide a novel refrigerator that minimizes heat leaking from the door of the refrigerator to the outside.

  The feature of the present invention is that the bent portion of the vacuum heat insulating material having the flat portion and the bent portion is arranged on the guide protrusion formed on the door and the flat portion is arranged on the flat portion of the door, and the vacuum heat insulating material is attached to the door. It is in the place embedded in the rigid urethane foam.

  According to the present invention, the flat part of the vacuum heat insulating material having a heat insulation performance larger than that of the hard urethane foam is arranged on the flat part of the door and the bent part is arranged on the guide projection part side, thereby arranging the door from the inside of the door. While suppressing the movement of heat toward the outside, it is also possible to suppress the movement of heat from the packing part between the door and the box to the outside via the guide protrusion, and as much heat as possible leaks from the door to the outside of the refrigerator. Can be reduced.

It is a front view of the refrigerator with which this invention is applied. It is the longitudinal cross-sectional view of the refrigerator which cut the refrigerator shown in FIG. 1 by AA. It is an expanded sectional view of the part in which the packing of the freezer compartment door which becomes one Example (1st Embodiment) of this invention was provided. It is sectional drawing of the freezer compartment door shown in FIG. It is sectional drawing after forming the bending part which shows the cross section of the vacuum heat insulating material shown in FIG. It is sectional drawing of the freezer compartment door used as the modification of 1st Embodiment. It is an expanded sectional view of the freezer compartment door used as the other example (second embodiment) of the present invention. It is sectional drawing after forming the bending part which shows the cross section of the vacuum heat insulating material shown in FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to the following embodiments, and various modifications and application examples are included in the technical concept of the present invention. Is also included in the range. First, a basic configuration of the refrigerator will be described based on FIGS. 1 and 2.

  1 and 2, the refrigerator 10 has storage rooms such as a refrigerator room 11, ice storage rooms 12a and 12b, a freezing room 13, and a vegetable room 14 from the top. As shown in FIG. 1, the front opening of each storage room is configured to be openable and closable by a door, and the refrigerator compartment doors 16a and 6b, the ice storage compartment door 17a and the upper freezer compartment that rotate around the hinge 15 and the like from above. A door 17b, a lower freezer compartment door 18, and a vegetable compartment door 19 are arranged. All the doors other than the refrigerator compartment doors 16a and 16b are drawer type doors, and when these drawer type doors 17 to 19 are pulled out, the containers constituting the respective storage chambers are pulled out together with the doors. is there.

  In order to seal the refrigerator main body 10 on the surface of each door 17 to door 19 on the storage chamber side, a packing 20 having a permanent magnet embedded therein is provided, and this packing 20 is provided outside the storage chamber side of each door 17 to door 19. It is attached near the periphery.

  In addition, a partition heat insulation wall 21 is arranged to partition and insulate between the refrigerator compartment 11 and the ice making room 12a and the upper freezing room 12b. The partition heat insulating wall 21 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 (hard urethane foam), vacuum heat insulating material, and the like. .

  Since the control temperature zone is the same between the ice making chamber 12a and the upper freezing chamber 12b and the lower freezing chamber 13, a partition member 22 that forms a receiving surface for the packing 20 is provided instead of a partition heat insulating wall that partitions and insulates. .

  A partition heat insulation wall 23 is provided between the lower freezer compartment 13 and the vegetable compartment 14 for partitioning and heat insulation. Like the partition heat insulation wall 21, it is a heat insulation wall of about 30 to 50 mm, which is also styrofoam or foamed. Made of heat insulating material (rigid urethane foam), vacuum heat insulating material, etc.

  Basically, partition heat insulation walls 21 and 23 are installed in partitions of rooms having different storage temperature zones such as refrigeration and freezing.

  In the box 24 constituting the main body of the refrigerator 10, the refrigerator compartment 11, the ice making compartment 12a and the upper freezer compartment 12b, the lower freezer compartment 13, and the storage compartment for the vegetable compartment 14 are partitioned from above, respectively. The arrangement of each storage room is not particularly limited to this.

  The refrigerator doors 16a and 16b, the ice making door 17a, the upper freezer compartment door 17b, the lower freezer compartment door 18, and the vegetable compartment door 19 are also 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 body 24 constituting the refrigerator body 10 includes an outer box 25 and an inner box 26, and a heat insulating portion 24 a is provided in a space formed by the outer box 25 and the inner box 26, and each storage chamber in the box body 24 is provided. Insulates the outside. Specifically, vacuum heat insulating materials 27a, 27b, and 27d are disposed in a space between the outer box 25 and the inner box 26, and a foam heat insulating material 24a such as rigid urethane foam is provided in a space other than the vacuum heat insulating materials 27a, 27b, and 27d. Is filled.

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

  Above the cooler 28, a blower 31 that circulates cold air cooled by the cooler 28 in the refrigerator and maintains a predetermined low temperature is disposed.

  Moreover, the partition heat insulation walls 21 and 22 are arrange | positioned as a heat insulating material which divides the refrigerator compartment 11, the ice making room 12a, the upper stage freezer compartment 12b, and the freezer compartment 13 and the vegetable compartment 14, respectively. The partition heat insulation walls 21 and 22 are made of expanded polystyrene 32 and a vacuum heat insulating material 27C, and the partition heat insulation walls 21 and 22 may be filled with a foam heat insulating material such as rigid urethane foam. It is not limited to thermal insulation.

  A storage recess 34 for storing electrical components 33 such as a substrate for controlling the operation of the refrigerator 10 and a power supply substrate is formed in the rear portion of the top surface of the box 24. A covering cover 35 is provided.

  The height of the cover 35 is arranged so as to be substantially the same height as the top surface of the outer box 25 in consideration of appearance design and securing the internal volume. Although it does not specifically limit, when the height of the cover 35 protrudes from the top | upper surface of an outer case, it is desirable to set it in the range within 10 mm.

  Along with this, the storage recess 34 is disposed in a state where only the space for storing the electrical component 33 is recessed on the heat insulating material 28 side, so that the inner volume is inevitably sacrificed in order to secure the heat insulation thickness. On the other hand, if the internal volume is increased, the thickness of the heat insulating material 28 between the storage concave portion 34 and the inner box 26 becomes thin. Therefore, the heat insulating performance is obtained by arranging the vacuum heat insulating material 27a in the heat insulating material 28 of the storage concave portion 34. Are secured and strengthened.

  In this embodiment, the vacuum heat insulating material 27a is a single vacuum heat insulating material 27a formed in a substantially Z shape so as to straddle the case of the interior lamp and the electrical component 33 described above. The cover 35 is made of a steel plate in consideration of heat resistance. In addition, since the compressor 29 and the condenser 30 arranged at the lower back of the box body 24 are components that generate a large amount of heat, a vacuum is applied to the projection surface on the inner box 26 side in order to prevent heat from entering the interior. A heat insulating material 27d is arranged.

  Next, a first embodiment of the present invention will be described with reference to FIGS.

  FIG. 3 is an enlarged cross-sectional view of a main part of the lower freezer compartment door 18 of the refrigerator 10 according to the first embodiment of the present invention. In order to bring the box 24 and the lower freezer compartment door 18 into close contact, a packing 20 is attached to the surface of the lower freezer compartment door 18 on the storage chamber side. The packing 20 is formed in a substantially rectangular frame in accordance with the shape of the front opening of the storage chamber.

  A slide rail (not shown) is fixed to the inner surface side of the lower freezer compartment door 18 by screws on the surface of the lower freezer compartment door 18 on the storage compartment side, and the lower freezer compartment door 18 slides inside the lower freezer compartment 13 by this slide rail. Is. In addition, a guide protrusion 38 that protrudes toward the lower freezer compartment 13 is formed on the inner surface side of the lower freezer compartment door 18, and this guide protrusion 38 faces the wall surface of the lower freezer compartment 13 through a minute gap. doing. The guide projection 38 is made of a hard urethane foam 18a. The rigid urethane foam 18a is a main base material that forms the lower freezer compartment door 18, and is a basic heat insulating material.

  The packing 20 is disposed in a packing insertion recess 39 provided on the inner peripheral edge of the lower freezer compartment door 18 on the storage chamber side. This recess 39 for packing insertion is formed in the hard urethane foam 18a which comprises the lower freezer compartment door 18. As shown in FIG. The packing insertion recess 39 further includes a packing locking recess 39a, and the packing 20 is locked by a locking piece 20a locked to the packing locking recess 39a.

  As a result, when the box body 24 and the lower freezer compartment door 18 are brought into close contact with each other, the packing 20 is stored in the packing insertion recess 39, and the periphery of the storage portion is filled and foamed in the lower freezer compartment door 18. Since it is covered with a heat insulating material such as foam, the gap between the box 24 and the lower freezer compartment door 18 can be reduced by the height of the packing insertion recess 39.

  In the present embodiment, the height of the packing 20 is set higher than the packing housing recess 39 of the lower freezer compartment door 18. This is because the packing 20 has a function of closely attaching the box 24 and the lower freezer compartment door 18 and a function of absorbing the impact force when the lower freezer compartment door 18 is closed by the packing 20.

  In other words, the contact body 20b of the packing 20 with the box 24 and the packing 20 insertion side end of the packing insertion recess 39 have the same height (the dimensions are determined so as to be substantially the same surface). The gap between 24 and the lower freezer compartment door 18 can be reduced as much as possible. However, the box body 24 and the lower freezer compartment door 18 come into strong contact with each other due to the impact force when the lower freezer compartment door 18 is closed, and there is a risk that damage will occur. Therefore, by making the height of the packing 20 higher than the packing insertion recess 39, the packing 20 contracts due to the impact force when the lower freezer compartment door 18 is closed, and the box 24 and the lower freezer compartment door 18 come into contact with each other. You can reduce the damage when you do.

  In order to strongly adhere the box 24 and the lower freezer compartment door 18, a magnet similar to the shape of the packing 20 is embedded in the packing 20, and the iron plate portion at the periphery of the front opening on the box 24 side By bringing the packing 20 into contact, the iron plate and the packing 20 may be strongly adhered to each other by magnetic force by the magnet of the packing 20.

  In general, since the heat insulation performance of the packing 20 is low, if the gap between the box 24 and the lower freezer compartment door 18 is large, heat is transferred from the packing 20 itself and the heat insulation performance is lowered. By reducing the gap between the box body 24 and the lower freezer compartment door 18 by storing it in the packing insertion recess 39 formed in the foam, heat transfer from the packing 20 itself is reduced and the heat insulation performance is reduced. Can be suppressed.

  Furthermore, by enclosing the periphery of the packing insertion recess 39 with a hard urethane foam 18a which is a heat insulating material for the lower freezer compartment door 18, the lower freezer compartment door 18 with less heat transfer from the packing 20 can be obtained.

  As a more characteristic configuration, in this embodiment, a vacuum heat insulating material 40 having a flat portion and a bent portion is housed in the lower freezer compartment door 18. Specifically, the vacuum heat insulating material 40 is embedded in the hard urethane foam 18a filled between the door inner plate 50 and the door outer plate 51 made of an iron plate constituting the lower freezer compartment door 18. The vacuum heat insulating material 40 has a heat insulating performance superior to that of a basic heat insulating material such as rigid urethane foam, and has a function of high heat insulating effect. As shown in FIGS. 3 and 4, the vacuum heat insulating material 40 has a flat portion 40 a and a bent portion 40 b at one end.

  The lower refrigeration door 18 includes a door inner plate 50, a door outer plate 51, and a rigid urethane foam 18a filled therein. The door inner plate 50 is disposed on the storage chamber side of the box body 24, and the door outer plate 51 is disposed outside the door.

  The door inner plate 50 is obtained by molding a relatively thin synthetic resin plate into an arbitrary shape according to the shape of the door. Similarly, the door outer plate 51 is also formed by molding a relatively thin iron plate into an arbitrary shape according to the shape of the door. The outer shape of the door is obtained by combining the two.

  The bent portion 40 b of the vacuum heat insulating material 40 is disposed in a guide projection 38 formed on the lower freezer compartment door 18, and the flat surface portion 40 a of the vacuum heat insulating material 40 is disposed along the flat surface portion 18 b of the lower freezer compartment door 18. Has been. Here, the length of the flat surface portion 40a is set to a length connecting the pair of guide protrusions 38 formed on the lower freezer compartment door 18.

  Further, in this embodiment, the length of the bent portion 40b of the vacuum heat insulating material 40 should extend to the tip of the guide projection portion 38, but the size thereof can be determined from the relationship between the heat insulating performance and the size of the refrigerator. It ’s good.

  Although not shown in the drawing, the bent portion 40 b of the vacuum heat insulating material 40 is fixed by being supported by the guide protrusion 38. On the other hand, the flat portion 40a side is locked by a locking mechanism provided on the door inner plate 50 or the door outer plate 51, and in this state, the rigid urethane foam 18a is filled to be disposed at a desired position.

  Thus, using the vacuum heat insulating material 40 integrally provided with the flat portion 40a and the bent portion 40b, the bent portion 40b is disposed on the guide protrusion 38 of the lower freezer compartment door 18, and the flat portion 40a is disposed in the lower freezer compartment. Since it is arranged along the flat portion 18b of the door 18, the flat portion 40a can suppress the movement of heat flowing from the storage chamber to the lower freezer compartment door 18, and the heat flowing from the guide projection 38 through the packing 20 can be suppressed. Since the movement can be suppressed, the heat transfer from the lower freezer compartment door 18 can be suppressed as much as possible, and the heat insulation performance can be improved.

  Furthermore, in this embodiment, the flat surface portion 40a of the vacuum heat insulating material 40 is in close contact with the inner surface side of the door inner plate 50 of the lower refrigeration door 18, but if this is done, the bent portion 40b will be as much as there is no hard urethane foam. Since the length can be shortened, the amount of use of the vacuum heat insulating material 40 can be reduced, and the operation and effect of reducing the thickness of the lower freezing door 18 by omitting the hard urethane foam 18a can be expected.

  Since the external dimensions of the refrigerator 10 are mainly disposed in the home, the dimensions determined for each capacity are taken into consideration in consideration of storability and the like. That is, since the installation area of the home where the refrigerator 10 is used is limited, the external dimensions are determined for each capacity of the refrigerator 10, and thus the external dimensions cannot be increased unnecessarily. For this reason, the external dimension of the refrigerator 10 can be made small by the approach which makes the thickness of the lower freezer compartment door 18 thin using the vacuum heat insulating material 40 like a present Example. Alternatively, since the internal volume can be increased by keeping the external dimensions of the refrigerator 10 as it is and expanding the dimensions of the storage chamber, the refrigerator 10 having a large capacity without changing the external dimensions can be provided.

  Next, the vacuum heat insulating material 40 shown in FIG. 4 will be described in more detail with reference to FIG.

  The vacuum heat insulating material 40 covers the two core materials 41a and 41b, the inner packaging material 42 for holding the core materials 41a and 41b in a compressed state, and the core materials 41a and 41b held in a compressed state by the inner packaging material 52. It is comprised from the jacket material 43 which has a gas barrier layer.

  The jacket material 43 is formed in a bag shape in which portions of a certain width are bonded together by thermal welding from the ridge line of the laminate film of the same size so as to form both surfaces of the vacuum heat insulating material 40. In this example, for the core materials 41a and 41b, glass wool having an average fiber diameter of 4 μm was used as a laminated body of fiber aggregates not bonded or bound by a binder or the like.

  About the core material core materials 41a and 41b, generation of outgas can be reduced by using a laminate of inorganic fiber materials, which is advantageous in heat insulation performance. However, it is not particularly limited to this, and for example, a fiber aggregate such as ceramic fiber, rock wool, glass fiber other than glass wool, or the like may be used.

  Moreover, although the inorganic fiber aggregate is used, it is also possible to use an organic resin fiber material. In the case of organic resin fibers, there are no particular restrictions on use as long as the heat resistant temperature is 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 spunbond method, If it is a fiberization method, it will not ask in particular.

  A film made of low-density polyethylene is used as the inner packaging material 42, but polypropylene, polyester, or the like can be used as long as the core material is covered and heat welding is possible, and is not particularly limited.

  The laminate structure of the jacket material 43 is not particularly limited as long as it has gas barrier properties and can be thermally welded. In the present embodiment, the surface protective layer, the first gas barrier layer, the second gas barrier layer, the heat The laminate film is composed of four layers of welding layers.

  The surface layer is a resin film having a role of a protective material, the first gas barrier layer is provided with a metal vapor deposition layer on the resin film, the second gas barrier layer is provided with a metal vapor deposition layer on a resin film having a high oxygen barrier property, and the first gas barrier layer And the second gas barrier layer are bonded 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, polyamide, polyethylene terephthalate film, the first gas barrier layer is a biaxially stretched polyethylene terephthalate film with aluminum vapor deposition, and the second gas barrier layer is aluminum vapor deposited. The biaxially stretched ethylene vinyl alcohol copolymer resin film, the biaxially stretched polyvinyl alcohol resin film with aluminum vapor deposition, or the aluminum foil, and the heat-welded layer were unstretched polyethylene, polypropylene, and other films.

  The layer configuration and materials of these four-layer laminate films are not particularly limited to these. For example, as the first and second gas barrier layers, a metal foil or a resin film provided with a gas barrier film made of an inorganic layered compound, a resin gas barrier coating material such as polyacrylic acid, or DLC (diamond-like carbon) is used. May be.

  Moreover, you may use a polybutylene terephthalate film etc. with a high oxygen barrier property etc. for a heat welding layer, for example.

  Furthermore, although the surface layer is a protective material for the first gas barrier layer, 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, since the resin-based film other than the metal foil used for the second gas barrier layer deteriorates the gas barrier property when it absorbs moisture, it is possible to arrange the gas barrier property by arranging a resin having a low hygroscopic property for the heat-welded layer. While suppressing deterioration, the moisture absorption amount of the whole laminate film can be suppressed. As a result, even in the vacuum evacuation process of the vacuum heat insulating material 40 described above, the amount of moisture brought into the jacket material 43 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 lamination method through a two-component curable urethane adhesive, but the type of adhesive and the bonding method are particularly limited to this. It is not necessary to use any other method such as a wet laminating method or a thermal laminating method.

  In the vacuum heat insulating material 40 as described above, in this embodiment, two core materials are used to form the flat surface portion 40a and the bent portion 40b on one side.

  That is, in this embodiment, the basis weight 1155 g / m2 of the fiber aggregate glass wool is used as the core material in two layers, the large core material 41a is 300 mm × 650 mm and the small core material 41b is 300 mm × 530 mm. One layer is used, and the small core material 41b is overlapped at the center of the width of the large core material 41a. This contributes to the successful formation of the bent portion 40b.

  In this embodiment, fiber aggregate glass wool is used, but a plurality of different core materials can be used for the core materials 41a and 41b. For example, it is also possible to use a fiber aggregate made of resin fibers on the small core material 41b, a fiber aggregate glass wool obtained by hot compression molding, or glass wool hardened with a binder.

  However, in the case where glass wool or the like hardened with a binder is used for the large core material 41a, it is difficult to form the bent portion 40b by bending after forming the vacuum heat insulating material 40. However, it is not preferable because the glass wool fiber as the core material 51 is broken and the heat insulating performance is deteriorated.

  The vacuum heat insulating material 40 is flat before evacuation, but is evacuated using a vacuum packaging device or the like, and the outer cover material 43 is heat-sealed by heat sealing in a state where the vacuum is evacuated. The heat insulating material 40 can be used. At this time, since the inside of the vacuum heat insulating material 40 is a vacuum, atmospheric pressure is applied from the outside, and the large core material 41a has a shape along the small core material 41b. A portion of the core material 41a larger than this is bent, and a bent portion 40b can be formed.

  In the present embodiment, by using one layer of the fiber aggregate glass wool weight per unit area of 1155 g / m2 as the core materials 41a and 41b, the thickness can be reduced to 5 mm when the vacuum heat insulating material 40 is vacuumed.

  As the core materials 41a and 41b, when one layer of a large core material 41a having a size of 300 mm × 650 mm and one layer of a small core material 41b having a size of 300 mm × 530 mm are used, the small core material 41b is used as a large core material 41a. If the vacuum heat insulating material is formed near the center, a step (thin wall portion) having a width of about 50 mm can be provided on both sides or the periphery of the vacuum heat insulating material 40. By bending the stepped portion toward the small core member 41b, a bent portion 40b having a width of about 50 mm can be formed.

  When a large core material 41a and a small core material 41b are provided and evacuated, a groove 44 (the groove itself is omitted in the drawing) is formed at the boundary between the large core material 41a and the small core material 41b. By forming the groove 44, the inner corner of the bent portion 40b can be easily formed.

  When the flat vacuum heat insulating material 40 having no groove 44 is bent, the outer cover material made of a laminate film having an aluminum foil or a metal layer contracts on the inner side where the groove is bent, resulting in local wrinkles and damage. May occur, leading to a decrease in gas barrier properties. However, the presence of the groove 44 for bending makes it possible to suppress the generation of wrinkles that occur when bent.

  In this way, the vacuum heat insulating material 40 provided with the bent portion 44b is formed, and when the lower freezer compartment door 4 is formed next, the rigid urethane foam is filled and foamed so that the bent portion 40b is positioned in the guide projection portion 38. If it does, the vacuum heat insulating material 40 comes to be arrange | positioned in a rigid urethane foam with a form as shown in FIG.3 and FIG.4, and it becomes possible to improve a heat insulation performance.

  Moreover, it can suppress that a wrinkle generate | occur | produces in this part by bend | folding the vacuum heat insulating material 40 by making the groove | channel 44 formed with the big core material 41a and the small core material 41b into the starting point. For this reason, when the vacuum heat insulating material 40 is disposed in close contact with the door inner plate 50, the occurrence of a gap between the door inner plate 50 and the vacuum heat insulating material 40 can be reduced, and the appearance is deteriorated. Can be prevented.

  In this embodiment, the bent portions 40b of the vacuum heat insulating material 50 are arranged on the guide projections 38 on one side. However, by providing the bent portions 40b of the vacuum heat insulating material 50 on both sides of the flat surface portion 40a, the guide raising on both sides is performed. The bent portion 40 b of the vacuum heat insulating material 50 can also be disposed in the portion 38. This will be described in the second embodiment.

  In this embodiment, the bent portion 40b of the vacuum heat insulating material 40 is disposed and fixed to the guide protrusion 38 on the side surface of the refrigerator, but the vacuum heat insulating material 40 is attached to the guide protrusion provided on the vertical side of the refrigerator. It is also possible to arrange the bent portion 40b.

  Next, a modification of the present embodiment will be described with reference to FIG. In this modification, a bent portion 40b is provided at one end of the vacuum heat insulating material 40, and the bent portion 40b is disposed in the guide projection portion 38 on one side, and the door outer plate is formed substantially diagonally from the guide projection portion 38 side. Inclined toward 51.

  Therefore, the flat surface portion 40a of the vacuum heat insulating material 40 has a shape extending diagonally through the lower refrigeration door 18, and the flat surface portion 40a is longer than the embodiment shown in FIG. Furthermore, it is different from FIG. 3 in that the hard urethane foam 18a is filled on both sides of the flat portion 40A.

  As described above, the bent portion 40b of the vacuum heat insulating material 40 is disposed in the guide protrusion 38 on one side, and the flat portion 40a extending diagonally is supported by the door outer plate 51. The vacuum heat insulating material 40 can be installed between the door inner plate 501 and the door outer plate 51 without providing a fixing support member.

  Moreover, in order to arrange the vacuum heat insulating material 40 so as to be inclined on the diagonal line of the lower freezer compartment door 18, the vacuum heat insulating material 40 is disposed in parallel with the door in close contact with either the door inner plate 50 or the door outer plate 51. Instead, the area of the vacuum heat insulating material 40 can be increased, and the heat insulating performance can be improved. That is, it is possible to reduce the degree of heat transfer in the left guide protrusion 38 compared to FIG.

  Furthermore, the bent portion 40b of the vacuum heat insulating material 40 is arranged on one side of the guide projection 38, and the vacuum heat insulating material 40 is arranged diagonally in the space formed by the door inner plate 50 and the door outer plate 51. The rigid urethane foam 18a can be filled between the flat surface portion 40a and the door inner plate 50, and between the flat surface portion 40a and the door outer plate 51, and the lower stage without reducing the appearance design of the door inner plate 50 and the door outer plate 51. The freezer compartment door 18 can be obtained.

  Next, a second embodiment of the present invention will be described with reference to FIGS.

  In FIG. 7, a pair of bent portions 40b are provided at both side ends of the flat surface portion 40a of the vacuum heat insulating material 40, the pair of bent portions 40b are disposed in the pair of guide projections 38, and the flat surface portion 40a is disposed on the door inner plate. 50 and the door outer plate 51 are arranged with a gap between them. As shown in FIG. 8, the vacuum heat insulating material 40 includes bent portions 40b formed at both side ends of the flat surface portion 40a, and has substantially the same configuration as the vacuum heat insulating material 40 shown in FIG. In short, the vacuum heat insulating material 40 in FIG. 5 has the bent portions 40b formed only on one side, but the vacuum heat insulating material 40 shown in FIG. 8 has the bent portions 40b formed on both sides. Accordingly, the configuration, material, manufacturing method, and the like of the vacuum heat insulating material 40 are substantially the same.

  Thus, using the vacuum heat insulating material 40 integrally provided with the flat surface portion 40a and the pair of bent portions 40b, the pair of bent portions 40b are disposed on the pair of guide protrusions 38 of the lower freezer compartment door 18, and Since the portion 40a is arranged along the flat portion 18b of the lower freezer compartment door 18, the flat portion 40a can suppress the movement of heat flowing from the storage chamber to the lower freezer compartment door 18, and the guide protrusion 38 can be used to seal the packing 20. It becomes possible to suppress the movement of heat flowing through the heat exchanger, to suppress the movement of heat from the lower freezer compartment door 18 as much as possible, and to improve the heat insulation performance.

  Moreover, since the vacuum heat insulating material 40 can be supported and fixed by disposing the pair of bent portions 40b provided in the vacuum heat insulating material 40 in the pair of guide protrusions 38, the vacuum heat insulating material 40 is provided without providing a fixing support member. Can be installed between the door inner plate 50 and the door outer plate 51.

  Further, the bent portion 40b of the vacuum heat insulating material 40 is disposed in the pair of guide protrusions 38, and the flat surface portion 40a of the vacuum heat insulating material 40 is disposed between the door inner plate 50 and the door outer plate 51, so that it is hard. The urethane foam 18a can be filled on both sides of the flat surface portion 40a and the door inner plate 50, and the flat surface portion 40a and the door outer plate 51, and the lower refrigeration is performed without reducing the appearance design of the door inner plate 50 and the door outer plate 51. The door 18 can be obtained.

  In this embodiment, the bent portions 40b are formed on both side ends of the vacuum heat insulating material 40 and arranged on the lower freezer compartment door 18, but the present invention can also be applied to doors of other storage rooms.

  Further, in the present embodiment, the description has been given using the refrigerator. However, as long as the structure has a heat-insulating box, a door for opening and closing the box, and a packing that closely contacts the box and the door, the same as in the present embodiment. The effect of can be obtained.

  DESCRIPTION OF SYMBOLS 10 ... Refrigerator, 11 ... Cold room, 12a ... Ice making room, 12b ... Upper stage freezer room, 13 ... Lower stage freezer room, 14 ... Vegetable room, 15 ... Door hinge, 16a ... Cold room door, 16b ... Cold room door, 17a ... Ice making room door, 17b ... Upper freezing room door, 18 ... Lower freezing room door, 18a ... Rigid urethane foam, 18b ... Flat surface part, 19 ... Vegetable room door, 20 ... Packing, 21, 23 ... Partition heat insulation wall, 22 ... Partition member, 24 ... box, 24a ... heat insulating material, 25 ... outer box, 26 ... inner box, 28 ... cooler, 29 ... compressor, 30 ... condenser, 31 ... blower, 32 ... expanded polystyrene, 33 ... electricity Parts 34, recesses 35, cover 38, guide projections 39, recesses for inserting packings 40 vacuum insulating material 40 a flat surfaces 40 b bent portions 41 a large core materials 41 b small core materials , 42 ... inner packaging material, 43 ... outer jacket , 50 ... door inner plate, 51 ... door skin.

Claims (4)

A box having a heat insulating function;
A door provided with a guide projection for opening and closing an opening provided in the box;
A refrigeration cycle for supplying cold air to the box;
A packing that is interposed on the surface of the door on the side that opens and closes the opening of the box, and that is located outside the guide projection and cooperates with the box to prevent leakage of cold air;
A refrigerator comprising: a flat portion housed in the door and extending along a surface of the door; and a vacuum heat insulating material formed with a bent portion that bends toward the guide projection. The refrigerator according to claim 1,
The door is formed with a door inner plate, a door outer plate, and a basic heat insulating material having a lower heat insulating performance than the vacuum heat insulating material filled therebetween, and the vacuum heat insulating material is embedded in the basic heat insulating material. A refrigerator characterized by. The refrigerator according to claim 2,
The bent portion formed on one of the flat portions of the vacuum heat insulating material is disposed in the guide projection, and the flat portion of the vacuum heat insulating material is disposed on a diagonal line of the space formed by the door inner plate and the door outer plate. The refrigerator is characterized in that the rigid urethane foam is filled between the flat portion of the vacuum heat insulating material and the inner plate of the door and between the flat portion of the vacuum heat insulating material and the door outer plate. The refrigerator according to claim 2,
The vacuum heat insulating material is composed of a core material composed of a plurality of fiber assemblies having different sizes, an inner packaging material that houses the core material, and an outer jacket material that houses the inner packaging material, and a small core material. A refrigerator characterized in that a core material having a large size is bent on the side.

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