JP2013002484A - Vacuum thermal insulation material and refrigerator using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve a three-dimensional vacuum thermal insulation material that prevents performance deterioration and has excellent appearance design, and a refrigerator using the same.SOLUTION: The vacuum thermal insulation material 50 has: a core material 51 made of inorganic fibers; an inner packing material 52 for housing the core material 51 therein; and an outer cover material for housing the inner packing material 52 therein. The inner packing material 52 is composed of a heat-sealed resin fiber layer. The resin fiber layer maintains the thickness of the core material 51. The ends of the resin fiber layer of the inner packing material 52 are contracted by heat sealing. Further, the surface of the resin fiber layer of the inner packing material 52 is formed into a concavo-convex shape or a planar shape by heat sealing.

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 shown in Patent Document 2, a core material with a small glass fiber volume can be obtained by sandwiching glass fiber as a core material with a nonwoven fabric and fixing the glass fiber with the nonwoven fabric by needle punching. is there.

  In the vacuum heat insulating material disclosed in Patent Document 3, a core material made of a fibrous material such as glass wool is compressed and stored in an inner packaging material, whereby the bulk of the core material can be reduced by holding the inner packaging material. As a result, the size of the outer bag material can be minimized, and the inner bag material can be stored in the outer bag material, so that the contact resistance at the time of insertion is less than that of the fibrous material, so that the outer bag material can be easily Can be inserted into the material.

Japanese Patent Laid-Open No. 2005-220954 JP 2010-60048 A 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 patent document 2, the glass fiber which is a core material is sandwiched between non-woven fabrics, and the volume of the glass fiber is reduced by needle punching. When it becomes large and it is set as a vacuum heat insulating material, there exists a possibility that heat insulation performance may deteriorate.

  In Patent Document 3, the core material can be stored in the outer bag material by storing and compressing the core material with the inner packaging material. However, it is necessary to provide an opening for discharging air from the inner packaging material before vacuum packaging. However, when air enters the inner packaging material through this opening, the fibrous material such as glass wool returns to the volume in the atmosphere. As a result, the outer bag material must be enlarged in order to prevent wrinkles from being generated or wrinkled at the final seal portion of the outer bag material.

  Then, an object of this invention is to obtain the three-dimensional vacuum heat insulating material with the favorable external appearance design property which suppressed the performance fall, and the 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-described problems. To give an example, an inorganic fiber core material, an inner packaging material that houses the core material, and an outer jacket material that houses the inner packaging material, In the vacuum heat insulating material having the above, the inner packaging material is composed of a thermally welded resin fiber layer, and the resin fiber layer maintains the thickness of the core material.

  ADVANTAGE OF THE INVENTION According to this invention, the solid-state vacuum heat insulating material with the favorable external appearance design property which suppressed the performance fall, and a refrigerator using the same can be obtained.

The front view of the refrigerator in the Example of this invention. The longitudinal cross-sectional view (AA sectional drawing of FIG. 1) of the refrigerator which shows Example 1 of this invention. The schematic sectional drawing of the vacuum heat insulating material used for this invention. BRIEF DESCRIPTION OF THE DRAWINGS Structure explanatory drawing of the resin fiber inclusion material of the vacuum heat insulating material which shows Example 1 of this invention. Structure explanatory drawing of the resin fiber inclusion material recessed part shape of the vacuum heat insulating material which shows Example 2 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 ( Hard urethane foam), vacuum insulation, etc. Basically, partition insulation walls are installed in the partitions of rooms with different storage temperature zones such as refrigeration and freezing. In addition, although the storage room of the refrigerator compartment 2, the ice-making room 3a, the upper stage freezer compartment 3b, the lower stage freezer compartment 4, and the vegetable compartment 5 is each dividedly formed in the box 20, the arrangement | positioning of each storage room is carried out. The invention is not particularly limited to this. Further, the refrigerator doors 6a and 6b, the ice making door 7a, the upper freezer compartment door 7b, the lower freezer compartment door 8, and the vegetable compartment door 9 are particularly limited in terms of opening and closing by rotation, opening and closing by drawers, and the number of divided doors. is not.

  The box 20 includes an outer box 21 and an inner box 22, and a heat insulating part is provided in a space formed by the outer box 21 and the inner box 22 to insulate each storage chamber in the box 20 from the outside. Yes. A vacuum heat insulating material 50 is 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 this embodiment, the surface protective layer, the gas barrier layer 1, the gas barrier layer 2, 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 1 is provided with a metal vapor deposition layer on the resin film, and the gas barrier layer 2 is metal vapor deposited on a resin film having a high oxygen barrier property. The gas barrier layer 1 and the gas barrier layer 2 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 film of polypropylene, polyamide, polyethylene terephthalate, the gas barrier layer 1 is a biaxially stretched polyethylene terephthalate film with aluminum vapor deposition, and the gas barrier layer 2 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 1 or 2, 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, 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.

  In addition, since the resin-based film other than the metal foil used for the gas barrier layer 2 deteriorates the gas barrier property due to moisture absorption, the gas barrier property can be reduced by disposing a resin having a low hygroscopic property for the heat welding layer. While suppressing deterioration, 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 lamination method through a two-component curable urethane adhesive, but the type of the 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.

  Although the adsorbent is not shown, a physical adsorption type synthetic zeolite is used in this embodiment. However, neither is limited to these materials.

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 is made up of glass wool fibers, which are inorganic fibers that form the core material 51, and polystyrene fibers, which are organic fibers that are the inclusion material 52. Basis weight 2800 g / m ² inorganic fibers glass wool in this embodiment, it is used the dimensions 300 mm × 300 mm, the inner wrapper 52, the basis weight of 50 g / m ² of fiber diameter 4~15μm polystyrene fibers of the organic fiber Used.

The glass wool fiber aggregate of inorganic fibers of the core material 51 of the vacuum heat insulating material 50 is wrapped with an organic fiber packing material 52, and the four sides around the packing material 52 are heat sealed. Heating is performed in a furnace at 100 ° C. for 30 minutes while applying a load of 0.02 kg / cm ² after heat sealing. By heating, the fibers of the organic fiber polystyrene fibers are welded together, and the shape can be maintained by shrinking. Moreover, since the fibers of polystyrene fibers are welded and contracted by heating, the heat seal part contracts and the ear part also welds and contracts around the four sides around the inner packaging material 52, so that the ear part can be reduced. it can. Thereby, the completed dimension of the vacuum heat insulating material 50 can be close to the dimension of the core material 51, and the error of the completed dimension of the vacuum heat insulating material 50 can be reduced.

  The inner packaging material 52 into which the core material 51 is inserted can be inserted into the outer jacket material 53 to perform vacuum packaging. In the case where the conventional core material is put in the inner packaging material 52, it is necessary to provide an opening immediately before performing vacuum packaging. However, the inner packaging material 52 of the present embodiment allows gas inside the core material to flow between the fibers of the organic fiber. Can be degassed. Thereby, since the gas inside the core material 51 can be deaerated from the entire inner packaging material, a vacuum can be drawn without providing an opening. Further, since the gas inside the core material 51 is degassed by the entire inner packaging material 52 and there is no need to provide an opening, the outside air flows in when the opening is provided using the bag-shaped inner packaging material 52, The core material 51 can be vacuum-packed without being restored to the atmospheric pressure. Further, it is possible to provide an opening in the inner packaging material 52 in order to make the vacuum inside the core material 51 faster. Even in the case where the opening is provided, heating is performed while a load is applied, and the fibers of the polystyrene fibers are welded to each other. Therefore, even if air flows in from the openings, the fibers of the polystyrene fibers are welded to each other to form the core material 51. Therefore, the core material 51 can be vacuum-packed without being restored to the atmospheric pressure.

(Example 2)
A second embodiment of the present invention will be described with reference to FIG. FIG. 5 shows an assembly of inorganic fiber glass wool fibers of a core material 51 of a vacuum heat insulating material 50 wrapped with an organic fiber packing material 52, and heat-sealed four sides of the packing material 52, and the load during heating. What was subjected to temperature was vacuum packaged. In the heating step, the sample was heated in a furnace at 100 ° C. for 10 minutes while applying a load of 0.02 kg / cm ² .

  Moreover, in the load, by heating using a 110 degreeC hotplate, the polystyrene fiber of the organic fiber of the inner packaging material 52 which is contacting with the hotplate welds more than a 100 degreeC weld part, load The inner packaging material welded portion 54 can be provided on the surface which is a contact surface with the hot plate. Since the fibers are welded to each other, the inner packaging material welded portion 54 is less compressed in the thickness direction after vacuum packaging than the glass wool fiber aggregate of inorganic fibers, and is less affected by unevenness due to the difference in basis weight. Thereby, the surface unevenness | corrugation of the vacuum heat insulating material 50 after vacuum packaging can be suppressed. By solidifying only the contact surface with the hot plate, it is possible to degas the gas inside the core material from multiple surfaces by curing only one surface, and to draw a vacuum without providing an opening.

  Further, since only the contact surface with the hot plate is solidified, it can have the same dimensions as the glass wool fiber aggregate of the inorganic fibers of the core material 51, and the layer with the glass wool fiber aggregate of the inorganic fibers of the core material 51. Without the occurrence of deviation, a vacuum heat insulating material with little dimensional error can be obtained when the vacuum heat insulating material 50 is used.

(Example 3)
In the vacuum heat insulating material 50 of the present embodiment, a convex is provided on the hot plate in the heating step and a load is applied to provide a concave on the polystyrene fiber of the organic fiber of the inner packaging material 52. By providing a convex on the hot plate of the load in the heating process, the polystyrene fibers of the organic fibers of the inner packaging material 52 are welded to the hot plate along the concave and convex shape, so that the concave shape 55 can be provided after packaging the inner packaging material. .

  Thereby, the glass wool fiber aggregate of inorganic fibers of the core material 51 is held in the concave shape 55 of the inner packaging material 52 even after vacuum packaging, and a concave portion can be provided on the surface of the vacuum heat insulating material 50.

  According to each of the above embodiments, in the vacuum heat insulating material having the core material of the inorganic fiber, the inner packaging material that accommodates the core material, and the outer jacket material that accommodates the inner packaging material, the inner packaging material is thermally welded. The resin fiber layer maintains the thickness of the core material.

  Moreover, the edge part of the said resin fiber layer of the said inner packaging material shrink | contracts by heat welding.

  Moreover, the surface of the resin fiber layer of the inner packaging material was formed into an uneven shape or a planar shape by heat welding.

  Moreover, the one side surface of the inner packaging material was heat-welded to form the uneven shape or the planar shape.

  Further, after the inside of the jacket material is opened to the atmosphere, the inner packaging material retains the uneven shape or the planar shape.

  Further, in the refrigerator in which a vacuum heat insulating material is disposed on the outer box surface or the inner box surface, the vacuum heat insulating material includes an inorganic fiber core material, an inner packaging material that stores the core material, and an outer jacket that stores the inner packaging material. The inner packaging material is composed of a thermally welded resin fiber layer, and the resin fiber layer maintains the thickness of the core material, and the outer box surface or the inner box Arranged to contact the surface.

  Thus, the bulk of the core material can be reduced by encapsulating the inorganic fiber core material of the vacuum heat insulating material in the resin fiber as the encapsulating material and thermally welding the resin fiber. Thereby, a performance fall can be suppressed by eliminating a binder and the fiber to a vertical direction in an inorganic fiber. Moreover, the vacuum heat insulating material which formed the recessed part in the core material can be provided by providing uneven | corrugated shape in the resin fiber.

DESCRIPTION OF SYMBOLS 1 Refrigerator 50 Vacuum heat insulating material 51 Core material 52 Inner material 53 Outer material 54 Inner material welding part 55 Concave shape

Claims (6)

  In a vacuum heat insulating material having an inorganic fiber core material, an inner packaging material that houses the core material, and an outer jacket material that houses the inner packaging material, the inner packaging material is composed of a thermally welded resin fiber layer, The vacuum heat insulating material, wherein the resin fiber layer maintains the thickness of the core material.   2. The vacuum heat insulating material according to claim 1, wherein an end portion of the resin fiber layer of the inner packaging material is contracted by heat welding.   3. The vacuum heat insulating material according to claim 1, wherein the surface of the resin fiber layer of the inner packaging material has an uneven shape or a planar shape by heat welding.   The vacuum heat insulating material according to claim 3, wherein the uneven shape or the planar shape is formed by thermally welding one side surface of the inner packaging material.   5. The vacuum heat insulating material according to claim 1, wherein the inner packaging material retains the concavo-convex shape or the planar shape after the inside of the jacket material is opened to the atmosphere. 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 an inorganic fiber core material, an inner packaging material for housing the core material, and an outer jacket material for housing the inner packaging material, and the inner packaging material is heat-welded. A refrigerator comprising a resin fiber layer, the resin fiber layer being disposed so as to contact the outer box surface or the inner box surface while maintaining the thickness of the core material.