JP2018017314A - Vacuum heat insulation material and refrigerator using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vacuum heat insulation material that inhibits deviation of irregularity shape of a glass wool sheet after vacuum drawing and has high-dimensional accuracy, and to provide a refrigerator including this vacuum heat insulation material.SOLUTION: A vacuum heat insulation material 50 includes: a core material 51 constituted of a fiber assembly; an adsorption agent for adsorbing a gas; and an exterior covering material 52 for storing the core material 51. The core material 51 includes: a wet type glass wool 61 obtained by a wet type sheet making method; and a dry type glass wool 60 obtained by a dry type method. The wet type glass wool 61 has a dimension that is smaller than a dimension of the dry type glass wool 60. This vacuum heat insulation material 50 is used for a refrigerator.SELECTED DRAWING: 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 product manufacturing processes, energy saving is promoted by promoting recycling of raw materials and reducing fuel and electricity costs in the manufacturing process. . Therefore, in addition to the need for a heat insulating material with higher heat insulating performance, the long-term life required to maintain the performance by breaking the vacuum heat insulating material incorporated in the product for a long period of time is required. There is a demand for an excellent vacuum heat insulating material that has a small space to be incorporated in the heat sink and that can increase the heat insulating area by using a heat insulating material having a shape according to the intended use.

Therefore, in order to arrange a vacuum heat insulating material in a limited heat insulating area, a vacuum heat insulating material having a shape matched to the pasting surface is required. Conventional vacuum heat insulating materials have a basic planar shape, and some of them are bent or curved according to the pasting surface. Also,
In the refrigerator, a vacuum heat insulating material is arranged on the side iron plate surface, and a heat radiating pipe is arranged between the iron plate and the vacuum heat insulating material. In order to avoid a heat radiating pipe, there is a method for manufacturing a vacuum heat insulating material having a shape by pressing the vacuum heat insulating material into a concavo-convex shape and providing a difference in the basis weight of raw cotton.

  Here, in order to make the concavo-convex shape of the vacuum heat insulating material, it can be formed into a concavo-convex shape by pressing after forming the vacuum heat insulating material, but the outer cover material of the vacuum heat insulating material is stretched by the press processing. , Gas barrier properties are reduced.

JP 2012-159144 A JP 2012-82594 A

  In Patent Document 1, dimensional accuracy is improved by sandwiching dry glass wool between glass wool sheets obtained by a wet papermaking method with high dimensional accuracy, and a vacuum heat insulating material having portions with different thicknesses can be obtained. . However, when a dry glass wool sheet is sandwiched between wet glass wool sheets, the dry glass wool sheet is so bulky that when compressed to atmospheric pressure after evacuation, the dry glass wool sheet is compressed by the pressure from the outside. The bulk of the sheet is reduced. Thereby, the position of the end surface of the wet glass wool sheet | seat of an upper surface and the wet glass wool sheet | seat of a lower surface does not match, and there exists a subject that a shift | offset | difference generate | occur | produces.

  In patent document 2, the vacuum heat insulating material which has an uneven | corrugated shape can be obtained by arrange | positioning so that a dry glass wool with a big dimension wraps a glass wool with a small dimension by stacking several dry glass wool with a different dimension. However, dry glass wool with different dimensions is used to make it uneven, but dry glass wool is bulky, so if the width of dry glass wool with small dimensions becomes smaller than a certain width, it will collapse, and the uneven shape after evacuation There has been a problem that the dimensions of are shifted.

  An object of the present invention is to provide a vacuum heat insulating material with high dimensional accuracy by suppressing the deviation of the uneven shape of the glass wool sheet after evacuation.

  In order to achieve the above object, in a vacuum heat insulating material comprising a core material made of a fiber assembly, an adsorbent that adsorbs gas, and a jacket material that houses the core material, the core material is wet. A wet glass wool obtained by a papermaking method and a dry glass wool obtained by a dry method are included, and the dimensions of the wet glass wool are made smaller than the dimensions of the dry glass wool.

  ADVANTAGE OF THE INVENTION According to this invention, the shift | offset | difference of the uneven | corrugated shape of the glass wool sheet | seat after evacuation can be suppressed, and a vacuum heat insulating material with high dimensional accuracy can be provided.

It is a front view of the refrigerator in the embodiment and comparative example of the present invention. It is a longitudinal cross-sectional view (AA sectional drawing of FIG. 1) of the refrigerator which shows embodiment of this invention. It is a schematic sectional drawing of the vacuum heat insulating material in Example 1 of this invention. It is an attachment figure of the vacuum heat insulating material in Example 1 of the present invention. It is a schematic sectional drawing of the vacuum heat insulating material in Example 2 of this invention. It is a schematic sectional drawing of the vacuum heat insulating material in Example 3 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 (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, All are drawer-type except the refrigerator compartment doors 6a and 6b and the refrigerator compartment doors 6a and 6b which rotate centering on hinges 10 grade | etc., From the top. The ice storage room door 7a, the upper freezer compartment door 7b, the lower freezer compartment door 8, and the vegetable compartment door 9 are arranged. When these drawer-type doors 6 to 9 are pulled out, the containers constituting each chamber are pulled out together with the doors. Each door 6-9 is provided with packing 11 for sealing with the refrigerator main body 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, it is a heat insulation wall of about 30 to 50 mm, and this is also a styrofoam or foam heat insulation. It is made of materials (rigid urethane foam), vacuum insulation materials, etc. Basically, partition heat insulation walls are installed in partitions of rooms with different storage temperature zones such as refrigeration and freezing.

  In the box 20, storage compartments for the refrigerator compartment 2, the ice making compartment 3a and the upper freezer compartment 3b, the lower freezer compartment 4, and the vegetable compartment 5 are formed from above, respectively. The invention is not particularly limited to this. The refrigerator doors 6a and 6b, the ice making door 7a, the upper freezer compartment door 7b, the lower freezer compartment door 8 and the vegetable compartment door 9 are also particularly limited in terms of opening and closing by rotation, opening and closing by drawer, and the number of divided doors. 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.

  A refrigerator 28 is provided on the back side of the freezer compartments 3a and 4 in order to cool the refrigerator compartment 2, the freezer compartments 3a and 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.

  Insulation partitions 12 and 14 are disposed as the heat insulating materials for partitioning the refrigerator compartment 2, ice making chamber 3a, upper freezer compartment 3b, freezer compartment 4 and vegetable compartment 5, respectively. 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 set it in the range within 10 mm. Along with this, the recess 40 is disposed in a state where only the space for housing the electrical component 41 is recessed on the 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 is composed of a core material 51 and a jacket material 52 having a gas barrier layer covering the core material 51. The covering material 52 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 ridgeline of the same size laminate film. In the present embodiment, the laminate structure of the jacket material 52 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 1, The laminate film is composed of a gas barrier layer 2 and a four-layer structure including a heat-welding layer, 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 an oxygen barrier property. A metal vapor deposition layer is provided on a high resin film, and 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 a film of unstretched polyethylene, polypropylene, or the like.

  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. The surface layer is a protective material for the gas barrier layer 1, but 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. Further, since the resin-based film other than the metal foil normally used for the gas barrier layer 2 deteriorates the gas barrier property by absorbing moisture, the gas barrier property can be obtained 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 52 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.

Example 1
A first embodiment of the present invention will be described with reference to FIGS.
FIG. 3 is a cross-sectional view of the vacuum heat insulating material 50 provided in the refrigerator 1 of the present embodiment. The structure of the vacuum heat insulating material 50 includes a glass wool fiber layer of a fiber assembly forming the core material 51, an adsorbent disposed (not shown) in an intermediate layer of the core material 51, and an outer envelope that wraps the core material 51. Material 52. A vacuum heat insulating material 50 can be obtained by heat-sealing the outer covering material 52 while the core material 51 is evacuated by a vacuum packaging machine with a material having such a configuration.

  As the core material 51, glass wool fibers made of glass wool sheets by a dry method are used. The dry glass wool 60 used for the core material 51 uses glass wool fibers obtained by a flame method or a centrifugal method.

  In this embodiment, fibers having a fiber diameter of 3 to 5 μm are used for the core material 51, but fibers having a fiber diameter of 0.1 to 10 μm may be used. As the fibers become thinner, the space between the fibers increases and the porosity increases, so that the thermal conductivity can be reduced when a vacuum heat insulating material is used. Moreover, since the fabric weight of a fiber can be reduced, so that a fiber diameter is thin, the surface property when it is set as a vacuum heat insulating material can be improved. However, the smaller the fiber diameter, the weaker the entanglement between the fibers and the weaker the strength as a glass wool sheet. Therefore, the fiber diameter of glass wool is preferably 2 to 6 μm, more preferably 3 to 5 μm.

  Moreover, although the fiber length used for the glass wool sheet of a present Example is about 3 mm-50 mm fiber, you may use the glass wool sheet of fiber length 1-300 mm. In the fiber length, the fabric weight variation can be reduced when the fiber length is shorter as the vacuum heat insulating material is used. On the other hand, the shorter the fiber length, the lower the thermal conductivity and the lower the strength of the glass wool sheet. This is because when the fiber length is short, the core material faces in the heat insulation direction when the vacuum heat insulation material is used, and heat is transmitted from the fiber oriented in the heat insulation direction, resulting in a decrease in heat insulation performance. Moreover, when the fiber length is short, the fibers are not entangled and the strength of the glass wool sheet is lowered. Therefore, the fiber length is preferably 5 to 100 mm, and more preferably 10 to 100 mm.

  Next, a wet papermaking method of wet glass wool 61, which is another glass wool used for the core material 51, will be described. In wet papermaking, a sheet-like fiber layer is obtained from the fibers remaining without dropping from the mesh by rolling and stirring the fibers in a dispersion for dispersing the fibers with a mesh-like plate or the like. Moisture is removed by passing the rolled sheet-like fiber layer through a roller press and an aspirator, and a glass wool sheet layer serving as a core material can be obtained. The reason for using the dispersion liquid is that the fiber aggregate glass wool is put in the dispersion liquid and stirred, so that the dispersant contained in the dispersion liquid adheres between the fibers, and the fibers repel each other, so that the fibers are in the solution. Can be dispersed. The dispersion used is a mixture of water and a dispersant, but if the dispersant is not used in the water of the dispersion, the fibers will not be separated and will become ball-shaped if they are sprinkled on a mesh-like plate. Therefore, it is necessary to add a dispersant to the dispersion. The dispersing agent in this example uses sulfuric acid, and the sulfuric acid concentration of the dispersion is adjusted to PH2-3. In addition, although sulfuric acid is used for a dispersing agent, it is not limited to this. Acidic dispersants include nitric acid and lactic acid in addition to sulfuric acid, and the fibers can be dispersed even when these are used as dispersants.

  Since the sulfuric acid used for the dispersion in this example is adjusted to a pH of 2-3, the concentration of sulfuric acid is a very thin concentration of about 0.2 to 0.3 wt%, and safety is ensured. ing. The higher the concentration of sulfuric acid PH is, the higher the concentration, the better the dispersibility when the fiber is added to the dispersion. However, there is a large difference in dispersibility even when PH1 and PH2 of the dispersion containing sulfuric acid are compared. Since it is not seen, it is preferable that the pH of the dispersion is PH2 to 3 in consideration of handleability. Further, since the dispersion liquid has a dispersibility even when PH is 4 or more, it can be used at a lower concentration of sulfuric acid in consideration of safety. As an acidic dispersant considering safety, there is ascorbic acid known as vitamin C. Since ascorbic acid is also used as a vitamin C in foods, it can be used without any problem in safety, and the fiber can be sufficiently dispersed even when ascorbic acid is used as a dispersant.

  Further, it can be dispersed by using an alkaline dispersant, a neutral dispersant, or a resin-based dispersant. For example, sodium hydroxide can be dispersed as an alkaline dispersant, and ethanol can be dispersed as a neutral dispersant. Examples of the resin dispersant include polyvinyl alcohol. The reason for using polyvinyl alcohol for the resin dispersant is that it is hydrophilic and easily dissolved in water. Therefore, there exists an advantage that it is easy to manufacture a dispersion liquid. However, when a resin-based dispersant is used, if the dispersion is stored for a long period of time, microorganisms and molds may be generated and may be spoiled, so it is necessary to add a preservative or a fungicide. Further, since stirring is performed after the fibers are added to the dispersion, foaming may occur during stirring. Therefore, it is preferable to add an antifoaming agent so as not to cause foaming.

  The reason why sulfuric acid is used in the dispersion is that the concentration can be easily controlled. This is because if the fiber is put into the dispersion and the production is continued, the dispersion agent adheres to the glass sheet after the evaporation and spreading of the liquid, and the dispersion concentration of the dispersion changes. Therefore, when sulfuric acid is used, the concentration can be controlled by PH, so that measurement can be easily performed by PH measurement. Similarly, alkaline dispersants can be measured with PH. On the other hand, there are resin-based dispersants whose PH does not change, and management with PH is not possible. Therefore, it is possible to measure the dispersant concentration of the dispersion by using a photometer.

Glass wool fibers obtained by a flame method or a centrifugal method are added to the dispersion thus obtained and stirred. In this embodiment, glass glass wool fibers are used. However, the present invention is not limited to this, and rock wool or resin fibers can also be used. The condition for dispersing the fiber is to add 7 g of glass wool fiber in a 50 L dispersion to bring the basis weight of one layer to 50 g / m ^2, and stir for 15 minutes with a propeller-like stirrer at a rotational speed of 2000 rpm. Can be distributed. The fiber dispersion after stirring varies depending on the shape of the propeller, the stirring speed, the stirring time, the dispersion and the amount of input fibers. In addition, the fiber dispersion can be improved by increasing the stirring time, but the fiber strength after the fibers are divided and sprinkled decreases as the stirring time is increased. By passing the dispersion liquid obtained by dispersing the fibers thus obtained through a net-like plate, the fibers remain on the plate and a glass wool sheet can be obtained.

  The wet glass wool 61 obtained as described above is placed on the dry glass wool 60. At this time, the dimensions of the wet glass wool 61 are smaller than the dimensions of the dry glass wool 60. The vacuum heat insulating material 50 can be produced by covering the dry glass wool 60 and the wet glass wool 61 with an inner bag, putting them in the outer jacket material 52, putting them in a vacuum chamber, and thermally welding the outer jacket material 52 after reducing the pressure in the chamber. . Since the inside of the heat insulating material is kept at a reduced pressure by thermally welding the jacket material 52 after the pressure reduction, the vacuum heat insulating material 50 is pressurized from the outside when the inside of the vacuum chamber is returned to the atmospheric pressure. At this time, in the dry glass wool 60 and the wet glass wool 61 disposed in the vacuum heat insulating material 50, the dry glass wool 60 follows the wet glass wool 61 because it is softer (see FIG. 3). With this effect, the uneven shape can be formed with one vacuum heat insulating material 50, and the shape can be formed according to the unevenness of the arrangement surface on which the vacuum heat insulating material 50 is disposed.

  Specifically, the dry glass wool 60 is formed from a planar shape as shown in FIG. 3 by evacuation in a state where a plurality of convex wet glass wools 61 are arranged on a part of the upper surface of the planar dry glass wool 60. Deforms into a wavy shape. And since the wet glass wool 61 is located inside the convex part 70 formed with this wavy dry glass wool 60, an uneven | corrugated shape can be formed with sufficient dimensional accuracy.

  Here, even if the dry glass wool 60 is disposed inside the convex portion 70, the vacuum heat insulating material 50 can be formed in an uneven shape, but the dimensional accuracy decreases as the width dimension of the dry glass wool 60 disposed in the convex portion 70 decreases. To do. This is because the dry glass wool 60 is bulky and is likely to be displaced when it is cut to a specified size. In addition, even if the dry glass wool 60 can be cut to a predetermined size, when the dry glass wool 60 disposed on the convex portion 70 is higher than the width when disposed on the dry glass wool 60, The dry glass wool will fall down and it will be difficult to place it in the specified position.

  On the other hand, the wet glass wool 61 can be cut with high dimensional accuracy by using the wet glass wool 61 as the glass wool disposed on the convex portion 70. In addition, when the wet glass wool 61 is disposed on the dry glass wool 60, the wet glass wool 61 can be disposed without falling because the wet glass wool 61 is small even if the width of the wet glass wool 61 is small. The ratio of the width dimension and the bulk of the wet glass wool 61 at this time is such that the wet dimension of the wet glass wool 60 is 50 or more, preferably 65 or more when the thickness dimension, which is the bulk of the wet glass wool 61, is 100. Glass wool 61 can be arranged without falling down. Thereby, it becomes easy to obtain the vacuum heat insulating material 50 having a plurality of irregularities. By using the wet glass wool 61 rather than the dry glass wool 60 for the convex portion 70, the convex portion 70 having a small width can be formed, so that the application application can be greatly increased.

  As an example of affixing, the affixing to iron plate surfaces, such as the outer case 21 of the refrigerator 1 as shown in FIG. 4, is mentioned. A heat radiating pipe 80 for cooling the refrigerator 1 is disposed on the iron plate surface of the refrigerator 1. In order to arrange the vacuum heat insulating material 50 on the iron plate surface of the refrigerator 1, it is necessary to avoid the heat radiating pipe 80 or to place it outside the vacuum heat insulating material 50 to which the heat radiating pipe 80 is attached. When the heat radiating pipe 80 is arranged outside the vacuum heat insulating material 50, the heat transfer area of the heat radiating pipe 80 and the iron plate 81 is reduced, so that the heat radiating efficiency is reduced, and as a result, the cooling efficiency of the refrigerator 1 is reduced. turn into. Therefore, it is necessary that the vacuum heat insulating material 50 avoid the heat radiating pipe 80 after the heat radiating pipe 80 is arranged on the iron plate surface. By using the vacuum heat insulating material 50 of the present embodiment, the vacuum heat insulating material 50 can be attached by the uneven shape of the vacuum heat insulating material 50 even after the heat radiating pipe 80 is arranged.

  Moreover, in the inner box 22 of the refrigerator 1, there exists a convex-shaped part for supporting a shelf as another arrangement example. Conventionally, urethane is injected into this convex shape portion, but since the width is small, there is a possibility that an unfilled portion is generated which is difficult to fill with urethane. Therefore, by combining the supporting convex portion for the shelf and the convex portion 70 of the vacuum heat insulating material 50, the refrigerator 1 having higher heat insulating performance can be obtained regardless of the filling property.

(Example 2)
A second embodiment of the present invention will be described with reference to FIG.
The vacuum heat insulating material 50 in FIG. 5 is obtained by vacuum packaging by placing a dry glass wool 60 and a wet glass wool 61 on a core material 51. In the present embodiment, the wet glass wool 61 having a convex shape has a shape in which the end surface 62 of the wet glass wool 61 stacked in a plurality of layers is cut obliquely. Thereby, the end surface 62 of an uneven | corrugated | grooved part can be made into a diagonal shape by arrange | positioning the wet glass wool 61 in the dry glass wool 60, and vacuum-packaging. Thereby, it can be set as the shape along the affixing surface which affixes the vacuum heat insulating material 50. FIG. The shape of the end portion 62 can be easily formed by arranging a shape obtained by obliquely cutting the end surface 62 of the wet glass wool 61 stacked on the inside of the convex portion 70.

  If the glass wool having a convex shape is also formed of dry glass wool, it is difficult to cut the dry glass wool into an arbitrary shape. That is, the dry glass wool 60 is bulky, so that even when trying to cut as it is, the force of the cutting blade escapes and it is difficult to cut. Therefore, it is necessary to cut the cut portion with a cutting blade while compressing the cut portion, and the cut portion can only be cut almost vertically. When dry glass wool is disposed inside the convex portion 70, the end of the convex portion 70 of the vacuum heat insulating material 50 is obtained. The shape of the portion 62 is inevitably almost a right angle.

  On the other hand, when the wet glass wool 61 is disposed on a part of one side surface in the thickness direction of the dry glass wool 60 as the core material to form an uneven shape, the convex portion 70 can be formed into an arbitrary shape. That is, since the wet glass wool 61 is small in volume, when the wet glass wool 61 is cut, the force of the cutting blade does not escape and can be cut to an arbitrary size. Therefore, the end part shape of the convex part 70 can be made diagonal by cutting the end part 62 of the wet glass wool 61 diagonally.

  In the present embodiment, the end 62 of the wet glass wool 61 is cut obliquely to form an oblique shape, but the present invention is not limited to this. By cutting the wet glass wool 61 into a circular shape or a polygonal shape, it is possible to change the shape of the convex portion 70 to an arbitrary shape. Moreover, the vacuum heat insulating material 50 which has the recessed part 71 in the center of the vacuum heat insulating material 50 can also be obtained by cutting the center part of the wet glass wool 61. FIG. As an example of attaching the vacuum heat insulating material 50 having the recess 71 at the center of the vacuum heat insulating material 50, an arrangement can be given on the bottom surface of the refrigerator 1. Since the compressor 30 is provided on the bottom surface of the refrigerator 1 and the compressor 30 is circular, a circular depression is generated on the bottom surface of the refrigerator 1. Therefore, when the vacuum heat insulating material 50 has the shape of the recessed part 71, the loss of the heat insulation thickness of the refrigerator 1 can be decreased, and the refrigerator 1 with thin heat insulation thickness and favorable heat insulation performance can be obtained.

(Example 3)
A third embodiment of the present invention will be described with reference to FIG.
Also in the vacuum heat insulating material 50 of FIG. 6, the dry glass wool 60 and the wet glass wool 61 are used for the core material 51. In the present embodiment, the wet glass wool 61 disposed inside the convex portion 70 is bent along the shape of the concave portion 71. That is, by cutting the end portion 62 of the wet glass wool 61 obliquely, the shape of the dry glass wool 60 becomes an oblique shape along the wet glass wool 61. Thereby, the vacuum heat insulating material 50 can be shape | molded by circular shape by bending to the dry-type glass wool side along the shape of the dry-type glass wool 60. FIG.

  As a product using this embodiment, it can be placed in a tank of a water heater. The tank shape of the water heater includes a quadrangular prism shape and a cylindrical shape. When the vacuum heat insulating material 50 is attached to the cylindrical tank, it is necessary to bend it. In the general square vacuum heat insulating material 50, if it is bent along the circular shape of the tank, wrinkles are generated inside the vacuum heat insulating material 50. Therefore, when pasted on a circular tank, a gap is generated between the vacuum heat insulating material 50 and the tank.

  Therefore, by using the vacuum heat insulating material 50 as shown in FIG. 6, the tank and the vacuum heat insulating material 50 can be attached without a gap, and a water heater having high heat insulating performance can be obtained. A heating pipe is installed in the tank of the water heater. The dry glass wool 60 and the wet glass wool 61 of the core material 51 of the vacuum heat insulating material 50 have a concavo-convex shape. However, by removing a part of the wet glass wool 61, the circular vacuum heat insulating material 50 may have a groove shape. It is possible to provide a gap in the heating pipe of the water heater.

DESCRIPTION OF SYMBOLS 1 Refrigerator 2 Refrigerating room 3a Ice making room 3b Upper freezing room 4 Lower freezing room 5 Vegetable room 6a Refrigerating room door 6b Refrigerating room door 7a Ice making room door 7b Upper freezing room door 8 Lower freezing room door 9 Vegetable room door 10 Door hinge 11 Packing
12, 14 Heat insulation partition 13 Partition member 20 Box body 21 Outer box 21a Top plate 21b Rear plate 21d Bottom plate 21e Side surface 21f Front surface 22 Inner box 23 Heat insulating material 23a Injection direction 23b Foaming direction 25 Injection hole 27 Blower 28 Cooler 30 Compressor 31 Condenser 33 Polystyrene foam 40 Concave part 41 Electrical component 42 Cover 50 Vacuum heat insulating material 51 Core material 52 Cover material 60 Dry glass wool 61 Wet glass wool 62 End part 70 Convex part 71 Concave part 80 Radiation pipe 81 Iron plate

Claims (5)

  In a vacuum heat insulating material comprising a core material composed of a fiber assembly, an adsorbent that adsorbs gas, and a jacket material that houses the core material, the core material is wet glass wool obtained by a wet papermaking method And a dry glass wool obtained by a dry method, wherein the wet glass wool has a size smaller than that of the dry glass wool.   In a vacuum heat insulating material comprising a core material composed of a fiber assembly, an adsorbent that adsorbs gas, and a jacket material that houses the core material, the core material is wet glass wool obtained by a wet papermaking method And a dry glass wool obtained by a dry method, wherein the dry glass wool has a convex portion, and the wet glass wool is located inside the convex portion. .   3. The vacuum heat insulating material according to claim 1, wherein the wet glass wool is disposed on one side surface in the thickness direction of the core material.   The vacuum heat insulating material according to any one of claims 1 to 3, wherein a ratio of a width dimension to a thickness dimension at atmospheric pressure of the wet glass wool is 50 or more with respect to a thickness dimension 100. Insulation.   In a refrigerator provided with a vacuum heat insulating material provided with a core material composed of a fiber assembly, an adsorbent that adsorbs gas, and a jacket material that houses the core material, the core material is obtained by a wet papermaking method. A wet glass wool obtained by a dry method, the wet glass wool having a size smaller than the dry glass wool, and the wet glass wool is installed on one side of the dry glass wool The refrigerator is characterized in that the surface where the vacuum heat insulating material is attached to the outer box of the refrigerator is the side opposite to the installation surface of the wet glass wool.

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