JP2013002580A - Vacuum thermal insulation material and refrigerator using the same - Google Patents

Abstract

The present invention provides a vacuum heat insulating material with improved heat insulating performance by reducing the influence of a heat bridge, and a refrigerator using the same.
A vacuum heat insulating material (50) having a core material (51) laminated with inorganic fibers, an inner packaging material (52) for housing the core material (51), and an outer jacket material (53) for housing the inner packaging material (52). 51 is composed of a plurality of laminated bodies having different sizes, and a part of the laminated body is arranged up to the vicinity of the end portion of the jacket material 53. Further, the laminated body arranged up to the vicinity of the end portion of the jacket material 53 was arranged between the inner packaging material 52 and the jacket material 53.
[Selection] Figure 3

Description

  The present invention relates to a vacuum heat insulating material and a refrigerator to which the vacuum heat insulating material is applied.

As a social effort to prevent global warming, energy conservation is being promoted in various fields in order to control CO ₂ emissions. In recent years, electric appliances, particularly household appliances related to cooling and heating, mainly use vacuum heat insulating materials to enhance heat insulating performance from the viewpoint of reducing power consumption. In addition, in order to reduce energy consumption from various raw materials to the manufacturing process of products, energy saving is promoted by promoting recycling of raw materials and reducing fuel and electricity costs in the manufacturing process. . Therefore, there is a demand for an excellent vacuum heat insulating material that can increase the heat insulating area by using a heat insulating material with higher heat insulating performance and a heat insulating material having a shape according to the application to be used.

  The core material of the vacuum heat insulating material generally used is an inorganic fiber. In order to use the core material of the vacuum heat insulating material as it is because the bulk is large at atmospheric pressure, the outer material is large considering the bulk of the core material. It must be used, or a binder must be attached to the core and made into a board by a compression press or the like. However, by enlarging the jacket material, the heat around the jacket material increases and the heat insulation performance decreases, and the manufacturing cost also increases. Therefore, in the vacuum heat insulating material shown in Patent Document 1, the glass fiber is plastically deformed to retain its shape by thermally compressing the aggregate of glass fibers serving as the core material. Thereby, the heat insulation board is obtained by making the bulk of the aggregate of glass fibers into a small core material.

  In the vacuum heat insulating material disclosed in Patent Document 2, by compressing a core material made of a fibrous material such as glass wool and storing the core material in an inner packaging material, the bulk of the core material can be reduced by holding it in the inner packaging material. Thereby, since the magnitude | size of an outer bag material can be minimized, the ear | edge of a jacket material can be made small.

Japanese Patent Laid-Open No. 2005-220954 JP-A-4-337195

  In Patent Document 1, a glass fiber that is a core material is heated and pressed to plastically deform the glass fiber to form a core material with a small bulk. However, the glass fiber used for the core material has high heat resistance and plastic deformation. Enormous amount of heat is required to hot press above the temperature. In addition, in order to maintain the shape below the plastic deformation temperature of the glass fiber, it is necessary to use a binder, but by using the binder, the glass fibers serving as the core material are bonded together by the binder, There is a possibility that the heat insulation performance deteriorates when the transmission becomes large and the vacuum heat insulating material is used.

  In the vacuum heat insulating material shown in Patent Document 2, the core material can be stored in the outer bag material by storing and compressing it with the inner packaging material, but the repulsive force of the inorganic fibers is high, and it is stored in the inner packaging material. However, the bulk cannot be reduced beyond a certain level. Therefore, the size of the outer bag material must be increased, and the width dimension of the outer bag material must be increased in order to prevent wrinkles or wrinkles at the final seal portion. Furthermore, since the width of the outer bag material is large, heat is circulated by the heat bridge at the ear portion where the surplus end portion is folded and bonded, and the heat insulation performance is lowered.

  Then, this invention aims at obtaining the vacuum heat insulating material which reduced the influence of the heat bridge, and improved the heat insulation performance, and a refrigerator using the same.

  In order to solve the above problems, for example, the configuration described in the claims is adopted. The present application includes a plurality of means for solving the above problems. To give an example, a core material in which inorganic fibers are laminated, an inner packaging material that houses the core material, and an outer jacket material that houses the inner packaging material The core material is composed of a plurality of laminated bodies having different sizes, and a part of the laminated body is disposed up to the vicinity of the end of the outer jacket material.

  ADVANTAGE OF THE INVENTION According to this invention, the influence of a heat bridge can be reduced and the vacuum heat insulating material which improved the heat insulation performance, and a refrigerator using the same can be obtained.

The front view of the refrigerator in the Example of this invention. The AA longitudinal cross-sectional view of the refrigerator of FIG. The schematic sectional drawing of the vacuum heat insulating material in the Example of this invention. Structure explanatory drawing of the resin fiber inclusion material of the vacuum heat insulating material in the Example of this invention.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a front view of a refrigerator showing the present embodiment, and FIG. 2 is a cross-sectional view taken along line AA of FIG.

  The refrigerator 1 provided with this embodiment shown in FIG. 1 has the refrigerator compartment 2, the ice storage compartment 3 (and switching room), the freezer compartment 4, and the vegetable compartment 5 from the top, as shown in FIG. The code | symbol of FIG. 1 is a door which obstruct | occludes the front-surface opening part of each said chamber, refrigeration room doors 6a and 6b, ice storage room door 7a and upper stage freezer compartment door 7b, lower stage freezer compartment door 8, vegetable compartment door 9 from the top. Place. When these drawer-type doors 6 to 9 are pulled out, the containers constituting each chamber are pulled out together with the doors.

  The refrigerator compartment doors 6a and 6b are rotary doors that rotate around a hinge 10 and the like. The ice storage compartment door 7a, the upper freezer compartment door 7b, the lower freezer compartment door 8, and the vegetable compartment door 9 are drawer-type doors. It is.

  Each door 6-9 is provided with packing 11 for sealing with the refrigerator 1, and is attached to the indoor side outer periphery of each door 6-9. Moreover, the partition heat insulation wall 12 is arrange | positioned in order to carry out the partition heat insulation between the refrigerator compartment 2, the ice-making room 3a, and the upper stage freezer compartment 3b. The partition heat insulating wall 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 (hard urethane foam), vacuum heat insulating material, and the like. .

  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. A partition heat insulation wall 14 is provided between the lower freezer compartment 4 and the vegetable compartment 5 to insulate the partition. Like the partition heat insulation wall 12, the heat insulation wall is about 30 to 50 mm, and is made of styrofoam or foam insulation ( Rigid 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 door 7b, the lower freezer door 8, and the vegetable door 9 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 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 rigid urethane foam. Although the vacuum heat insulating material 50 is demonstrated in FIG. 3, it is fixedly supported by the fixing member 70, the supporting member 80, etc. which are mentioned later.

  In addition, a refrigerator 28 is provided on the back side of the freezer compartments 3a, 4 in order to cool the refrigerator compartment 2, the freezer compartments 3a, 4 and the vegetable compartment 5 to a predetermined temperature. The refrigeration cycle is configured by connecting the cooler 28, the compressor 30, the condenser 30a, and a capillary tube (not shown). 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.

  Moreover, as the heat insulating material which divides 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, the heat insulating partitions 12 and 14 are arranged respectively, and the expanded polystyrene 33 and the vacuum heat insulating material 50c are used. It is configured. The heat insulating partitions 12 and 14 may be filled with a foam 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 50c.

  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 heat insulating material 23 of the recessed part 40, and the heat insulation performance is ensured and strengthened. 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 and the electrical component 41 of the interior lamp 45 described above. 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 50d is arranged.

  Here, the configuration of the vacuum heat insulating material 50 will be described with reference to FIG. The vacuum heat insulating material 50 includes a core material 51, an inner 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. It is configured. The covering material 53 is disposed 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 laminate film having the same size. In the present embodiment, as the core material 51, glass wool having an average fiber diameter of 4 μm was used as a laminate of inorganic fibers not bonded or bound with a binder or the like.

  The core material 51 is advantageous in terms of heat insulation performance because the outgas is reduced by using a laminate of inorganic fiber materials. However, the core material 51 is not limited to this. For example, ceramic fibers, rock wool, glass wool, etc. Other inorganic fibers such as glass fibers may be used.

  The laminate structure of the jacket material 53 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 gas barrier layer a, the gas barrier layer b, and the heat welded layer are used. The laminate film is composed of the following four layers, the surface layer is a resin film serving as a protective material, the gas barrier layer a is provided with a metal vapor deposition layer on the resin film, and the gas barrier layer b is vapor deposited on a resin film having a high oxygen barrier property A layer is provided, and the gas barrier layer a and the gas barrier layer b are bonded so that the metal 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 film of polypropylene, polyamide, polyethylene terephthalate, the gas barrier layer a is a biaxially stretched polyethylene terephthalate film with aluminum vapor deposition, and the gas barrier layer b is biaxially stretched with aluminum vapor deposition. An ethylene vinyl alcohol copolymer resin film, a biaxially stretched polyvinyl alcohol resin film with aluminum vapor deposition, or an aluminum foil was used, and the heat-welded layer was an unstretched polyethylene, polypropylene, or other film. The layer structure and material of the four-layer laminate film are not particularly limited to these. For example, as a gas barrier layer a or b, a metal foil or a resin film provided with a gas barrier film made of an inorganic layer compound, a resin gas barrier coating material such as polyacrylic acid, DLC (diamond-like carbon), or the like, or heat-sealed For example, a polybutylene terephthalate film having a high oxygen barrier property may be used for the layer.

  The surface layer is a protective material for the gas barrier layer a. However, in order to improve the vacuum exhaust efficiency in the manufacturing process of the vacuum heat insulating material, it is preferable to dispose a resin having a low hygroscopic property. Moreover, since the resin-based film other than the metal foil normally used for the gas barrier layer b deteriorates the gas barrier property due to moisture absorption, it is possible to arrange the gas barrier property by arranging a resin having a low hygroscopic property for the heat-welded layer. This suppresses the moisture absorption of the entire laminate film. 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 lamination method via a two-component curable urethane adhesive, but the type of adhesive and the bonding method are particularly limited to this. However, it may be any other method such as a wet laminating method or a thermal laminating method.

  In addition, as for the inner packaging material 52, a polyethylene film and an adsorbent that can be thermally welded are not shown in this embodiment, but a physical adsorption type synthetic zeolite is used in this embodiment. However, these are not limited to these materials, and the inner packaging material 52 may be a polypropylene film, a polyethylene terephthalate film, a polybutylene terephthalate film, etc., as long as it has low hygroscopicity and can be thermally welded and has a small outgas. The agent adsorbs moisture and gas and may be either physical adsorption or chemical reaction type adsorption.

Example 1
Embodiment 1 of the present invention will be described with reference to FIG. FIG. 4 is a cross-sectional view of the vacuum heat insulating material 50 provided in the outer box 21 of the refrigerator 1 according to the embodiment of the present invention. The configuration of the vacuum heat insulating material 50 includes glass wool of inorganic fibers that form the core material 51 and polystyrene fibers of organic fibers that are the inner packaging material 52. In this embodiment, the basis weight of inorganic fiber glass wool is 2800 g / m ² and the dimensions are 300 mm × 300 mm. The inorganic fiber glass wool has a bulk of 300 to 400 mm at atmospheric pressure, but it can be degassed by wrapping in the inner packaging material 52 and compression-pressing with an iron plate, and the inner packaging material 52 is compressed and pressed. Heat seal around 4 sides. Thereby, the bulk can be made 30-50 mm by holding the glass wool of the inorganic fiber of the core material 51 with the inner packaging material 52.

Since the core material 51 wrapped with the inner packaging material 52 has a bulk of 30 to 50 mm, it can be inserted into the jacket material more easily than glass wool made of inorganic fibers at atmospheric pressure. However, the dimensions of the jacket material are dimensions in consideration of the dimensions of the core material 51 and the bulk of the core material wrapped with the inner packaging material 52, and further need to be +20 to 30 mm in consideration of insertability. Thereby, the thickness when it is set as a vacuum heat insulating material will be 10-13 mm in the fabric weight 2800g / m < ² > of the inorganic fiber glass wool used by this invention. Therefore, since the bulk of the core material 51 wrapped with the inner packaging material 52 is 30 to 50 mm, it is necessary to increase the size of the 40 mm jacket material. A 70 mm ear will be generated. Therefore, a low bulky wide core material 54 thinner than the thickness of the core material 51 when it is used as a vacuum heat insulating material is disposed between the inner packaging material 52 that wraps the core material 51 and the outer jacket material 53 into which the core material 51 is inserted. Thereby, when it is set as a vacuum heat insulating material, a core material can be arrange | positioned to an edge part. In addition, since the low bulky wide core material 54 is disposed up to the end of the jacket material 53, it can be disposed without misalignment when a vacuum heat insulating material is used.

  A vacuum heat insulating material is provided by inserting a core material 51, an inner packing material 52 and a low bulky wide core material 54 into the outer jacket material 53, and providing a final seal portion for depressurizing the inside and thermally welding the outer jacket material 53. However, when the jacket material 53 is heat-welded, the width of the outer bag material must be increased in order not to cause wrinkles due to twisting of the jacket material.

  By providing the core material 51 and the final seal portion with the low bulky wide core material 54, the core material can be arranged up to the end. By arranging the vacuum heat insulating material 50 obtained as described above in the refrigerator as a heat insulating material, the heat bridge can be reduced.

In this embodiment, a polystyrene resin fiber having a basis weight of 110 g / m ^{2 and a} thickness of 1 mm is used as the low bulky wide core material 54. By using the low bulky wide core material 54 as a resin fiber, the glass wool used for the core material 51 is hot pressed at a temperature equal to or higher than the plastic deformation temperature and the glass fibers are bonded to each other. can do. Moreover, since the low bulky wide core material 54 is made of resin fiber, it can be bent because it is softer than glass fiber, and the low bulky wide core material 54 larger than the core material 51 can be folded. In addition, it is possible to fold the low-bulk wide core material 54 using glass wool, but once bent, the fiber breaks and cannot be reused with glass wool. However, the resin fiber breaks the fiber. Therefore, once used fibers can be reused for recycling.

  In this example, polystyrene resin was used as the resin fiber, but it is common to fiberize polyethylene terephthalate, polypropylene or the like so as to have a fiber diameter of about 1 to 30 μm by the melt blown method or the spun bond method. Any organic resin or fiberizing method that can be made into fibers can be used.

(Example 2)
A second embodiment of the present invention will be described. In the vacuum heat insulating material 50 of the present embodiment, the flatness is improved by performing hot plate pressing on the low bulky wide core material 54 in the heating step. A surface layer of polystyrene resin fibers can be welded by pressing a hot plate at 110 ° C. for 5 minutes onto polystyrene resin fibers. By disposing the polystyrene resin fibers between the inner packaging material 52 and the jacket material 53 of the vacuum heat insulating material 50, a vacuum heat insulating material having smoothness better than glass wool of inorganic fibers can be obtained. Moreover, since only the surface layer of the resin fiber is welded, it is also possible to fold the low bulky wide core material 54 larger than the core material 51.

  According to each of the above embodiments, in the vacuum heat insulating material having a core material in which inorganic fibers are laminated, an inner packaging material that houses the core material, and an outer jacket material that houses the inner packaging material, the core material is It was composed of a plurality of laminated bodies having different sizes, and a part of the laminated body was arranged up to the vicinity of the end portion of the jacket material.

  Moreover, the laminated body arrange | positioned to the said jacket material edge part vicinity was arrange | positioned between the said inner packaging material and the said jacket material.

  Moreover, the laminated body arrange | positioned to the said jacket material edge part vicinity was bent with the said jacket material.

  Moreover, the thickness at atmospheric pressure of the laminated body arranged up to the vicinity of the end portion of the jacket material is 5 mm or less.

  Moreover, the laminated body arrange | positioned to the said jacket material edge part vicinity is a resin fiber.

  Further, in the refrigerator in which the vacuum heat insulating material is arranged on the outer box surface or the inner box surface, the vacuum heat insulating material stores a core material in which inorganic fibers are laminated, an inner packaging material that stores the core material, and the inner packaging material. A vacuum heat insulating material having a jacket material, wherein the core material is composed of a plurality of laminated bodies having different sizes, and a part of the laminated body is disposed up to the vicinity of an end portion of the jacket material, And it provided in the side which touches the said outer box surface or the said inner box surface.

  Thereby, the influence of a heat bridge can be reduced and the vacuum heat insulating material which improved the heat insulation performance, and a refrigerator using the same can be obtained.

DESCRIPTION OF SYMBOLS 1 Refrigerator 50 Vacuum heat insulating material 51 Core material 52 Inner packaging material 53 Outer material 54 Low bulk width wide core material

Claims (7)

  In a vacuum heat insulating material having a core material in which inorganic fibers are laminated, an inner packaging material that houses the core material, and an outer jacket material that houses the inner material, the core material is a plurality of laminated bodies having different sizes. It is comprised, The vacuum heat insulating material characterized by including a part of this laminated body arrange | positioned to the said jacket material edge part vicinity.   2. The vacuum heat insulating material according to claim 1, wherein the laminate disposed up to the vicinity of the end portion of the outer jacket material is disposed between the inner packaging material and the outer jacket material.   The vacuum heat insulating material according to claim 1 or 2, wherein the laminated body disposed up to the vicinity of the end portion of the outer cover material is bent together with the outer cover material.   The vacuum heat insulating material according to any one of claims 1 to 3, wherein a thickness of the laminated body arranged up to the vicinity of the end portion of the jacket material is 5 mm or less.   The vacuum heat insulating material according to any one of claims 1 to 4, wherein a shrinkage after vacuum packaging of the laminated body arranged up to the vicinity of the end portion of the jacket material is 0 to 50%. .   The vacuum heat insulating material according to any one of claims 1 to 5, wherein the laminate disposed up to the vicinity of the end portion of the jacket material is a resin fiber. In the refrigerator in which the vacuum heat insulating material is arranged on the outer box surface or the inner box surface,
The vacuum heat insulating material is a vacuum heat insulating material having a core material in which inorganic fibers are laminated, an inner packaging material that houses the core material, and an outer jacket material that houses the inner packaging material, and the core material is large. It is composed of a plurality of laminated bodies having different thicknesses, and a part of the laminated body is arranged up to the vicinity of the end portion of the outer jacket material and provided on the side contacting the outer box surface or the inner box surface. Refrigerator.