JP2013002485A - Vacuum thermal insulation material, and refrigerator using the same - Google Patents

Abstract

A vacuum heat insulating material with improved surface smoothness and high heat insulating performance and a refrigerator with high heat insulating performance provided with the same.
A glass wool layer 52b, an inner bag material 53 for storing the glass wool layer 52b, an outer jacket material 54 for storing the inner bag material 53, and an inner bag material 53 and an outer jacket material 54. And the resin fiber layer 52a. The vacuum heat insulating material 50 provided with the resin fiber layer 52a has a fusion part in which fibers are fused to the surface of the resin fiber layer 52a on the outer covering material 54 side, and the fusion part is a glass wool layer. It is smaller than the width of 52b, and has a concave shape, a convex shape, a curved shape, or a combination thereof.
[Selection] Figure 6

Description

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

2. Description of the Related Art In recent years, electrical 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 and CO ₂ emission. In addition, in order to suppress all energy consumption from various raw materials to the product manufacturing process, energy saving is promoted by promoting recycling of raw materials and reducing fuel costs and electricity costs in the manufacturing process. .

  Patent Document 1 describes that, in a vacuum heat insulating material, surface smoothness of the vacuum heat insulating material is obtained by providing a sheet-like material between a core material in which glass fibers are laminated and an outer bag.

JP 2006-125631 A

  Conventionally, when the core material is wrapped with an outer bag material and the inside is decompressed, the irregularities of the core material appear as they are as the surface shape of the vacuum heat insulating material due to the pressure from the outside air. If it does so, when the surface of the vacuum heat insulating material was affixed on the box with the uneven state, there existed a problem that a clearance gap produced and heat insulation performance fell. Further, if the unevenness is too large, the sticking force is weakened, and there is a possibility that the position shift occurs.

  In the vacuum heat insulating material described in Patent Document 1, there is a problem that a stacking error occurs between the glass fiber and the sheet-like material and a step is generated on the surface.

  Further, in the case where the sheet-like material is positioned above and below the glass fiber, the end of the sheet-like material may hit the outer bag and damage the outer bag.

  Further, when the sheet-like material is disposed, there is a problem that the positioning means is troublesome because the positioning means is not provided, and the cost is increased.

  Then, in view of the said subject, this invention aims at providing the vacuum heat insulating material which improves surface smoothness, and has high heat insulation performance, and a refrigerator with high heat insulation performance provided with this.

  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-mentioned problems. To give an example, a glass wool layer, an inner bag material for storing the glass wool layer, an outer jacket material for storing the inner bag material, In a vacuum heat insulating material provided with an inner bag material and a resin fiber layer accommodated between the jacket material, a fusion part in which fibers are fused to the surface of the resin fiber layer on the jacket material side The fused portion is smaller than the width of the glass wool layer, and has a concave shape, a convex shape, a curved shape, or a combination thereof.

  ADVANTAGE OF THE INVENTION According to this invention, the surface smoothness can be improved and a vacuum heat insulating material with high heat insulation performance and a refrigerator with high heat insulation performance provided with this can be provided.

It is a block diagram which shows the vacuum heat insulating material which concerns on one Embodiment of this invention. It is a figure which shows the usage example of the vacuum heat insulating material which concerns on one Embodiment of this invention. It is a front view of the refrigerator to which the vacuum heat insulating material which concerns on one Embodiment of this invention is applied. FIG. 4 is a sectional view taken along line AA in FIG. 3. It is a figure which shows the example of application of the vacuum heat insulating material which concerns on one Embodiment of this invention different from FIG. It is a figure which shows the application example of the vacuum heat insulating material which concerns on one Embodiment of this invention different from FIG. It is a perspective view of the vacuum heat insulating material single-piece | unit which concerns on another embodiment of this invention. It is a BB sectional view of the vacuum heat insulating material shown in FIG. It is a figure which shows the example of application to the refrigerator door part of the vacuum heat insulating material shown in FIG.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. FIG. 1 is a configuration diagram illustrating a vacuum heat insulating material according to an embodiment of the present invention. FIG. 2 is a diagram illustrating a usage example of the vacuum heat insulating material according to the embodiment of the present invention. FIG. 3 is a front view of a refrigerator to which a vacuum heat insulating material according to an embodiment of the present invention is applied. 4 is a cross-sectional view taken along line AA in FIG. Furthermore, FIG. 5 is a figure which shows the example of application of the vacuum heat insulating material which concerns on one Embodiment of this invention different from FIG. FIG. 6 is a diagram showing an application example of a vacuum heat insulating material according to an embodiment of the present invention different from FIG.

  The structure of the vacuum heat insulating material 50 is such that a resin fiber layer 52a which is an organic fiber aggregate serving as a core material 51, a glass wool layer 52b which is an inorganic fiber aggregate and an adsorbent (not shown) are wrapped in an inner bag material 53, and gas barrier properties are obtained. It is vacuum-packed with a jacket material 54 having In this embodiment, polystyrene fibers are used as the resin fiber layer 52a of the core material 51. However, resin fibers such as polypropylene and polyethylene terephthalate can also be used.

  For the inner bag material 53, a polyethylene film is used, but a polypropylene film, a polyethylene terephthalate film, a polybutylene terephthalate film, or the like that has low hygroscopicity and can be heat-welded and has little outgas can also be used. As the adsorbent, a physical adsorption type synthetic zeolite is used, but any adsorbent that adsorbs moisture or gas may be used, and a chemical reaction type adsorbent such as silica gel, calcium oxide, calcium chloride, strontium oxide or the like can also be used.

  For the jacket material 54, a polypropylene film having low hygroscopicity is provided as a surface layer, an aluminum vapor deposition layer is provided on a polyethylene terephthalate film as a moisture barrier layer, and a gas barrier layer is provided with an aluminum vapor deposition layer on an ethylene vinyl alcohol copolymer film. The layers were laminated so as to face the aluminum vapor deposition layer. The laminate structure of the jacket material 54 is a four-layer structure of the above material, but is not limited to the above structure as long as it is a polyamide film or a polyethylene terephthalate film having equivalent gas barrier properties, heat resistance, and piercing strength. .

  The vacuum heat insulating material 50 is obtained by providing a fused portion to the fiber on the surface of the resin fiber layer 52a that becomes the core material 51. Polystyrene resin is melted at 290 ° C. and fiberized by the melt blown method. When the fiber is formed, a resin fiber provided with a fusion part can be manufactured by adjusting the extrusion amount of the resin. The fiber diameter of the resin fiber is 5 to 30 μm, preferably 5 to 10 μm, and the fusion part between the fibers is 10 to 200 μm, preferably 20 to 40 μm. In addition, when the fusion | melting part of a resin fiber increases and a fiber diameter is too thick, when it is set as a vacuum heat insulating material, when a contact part of a fiber increases too much, thermal conductivity will become high and performance will deteriorate. On the other hand, if the fusion part is 200 μm or more, the resin is excessively fused, and the resin cannot be stretched during spinning and cannot be fiberized. Further, if the fiber diameter is too thin, it becomes impossible to make a fused part by being cooled immediately after spinning, so that the fiber aggregate is laminated.

By providing the resin fiber with a bundle-like fusion part with fibers of 10 μm to 200 μm, the rigidity of the fusion part increases when it is used as a vacuum heat insulating material, so that the surface smoothness can be improved even when contracted. . Further, as a method of providing the fusion part, in addition to adjusting the extrusion amount at the time of fiberization, the fusion part can be provided in the middle of the fiber assembly by increasing the basis weight of the fiber assembly to be laminated. Specifically, when the basis weight is 200 to 800 g / m ² , heat is accumulated without being released when the resin fibers are laminated, and a fusion part can be provided at the center of the layer. More preferably, the basis weight is 300 to 400 g / m ² . This is because when the basis weight is too large, heat is accumulated too much, and when a vacuum heat insulating material is used, the contact portion of the fibers increases and the thermal conductivity increases. Further, if the basis weight is too small, stacking deviation occurs.

  As a method of providing a fused portion on the surface of the resin fiber, heat compression can be performed. By heating and compressing one side with a hot plate set to a temperature higher than the softening temperature of the resin fibers, the surface resin fibers can be melted to improve surface smoothness when used as a vacuum heat insulating material. If the heating temperature is too high, there will be too many fusion parts, and when the vacuum heat insulating material is used, the contact parts of the fibers will increase, and the thermal conductivity will increase. Therefore, in order to prevent the resin fibers from melting and shrinking, the heating temperature is preferably 20 to 50 ° C. higher than the softening temperature of the resin fibers.

Example 1
FIG. 2 is a diagram illustrating a usage example of the vacuum heat insulating material according to the embodiment of the present invention. The fiber of the resin fiber layer 52a which becomes the core material 51 of the vacuum heat insulating material 50 is provided with a fused portion. The fiber of the resin fiber layer 52a is obtained by melting a polystyrene resin at 290 ° C. and fiberizing it by a melt blown method. At the time of this fiberization, the resin fiber which provided the melt | fusion part can be manufactured by adjusting the extrusion amount of resin. The amount of extrusion at this time was 5 kg / h and the fiber diameter was 8 to 10 μm, so that the fused part was 22 to 128 μm.

  With these configurations, the resin fiber layer 52a, the glass wool layer 52b, and the adsorbent are wrapped in the inner bag material 53, set in a vacuum packaging machine with the outer jacket material 54 having gas barrier properties, and the pressure is reduced to 2.2 Pa. After holding for a certain time at 2.2 Pa or less, the envelope material 54 was sealed to obtain a vacuum heat insulating material. When the heat conductivity of the vacuum heat insulating material obtained by this was measured with Eihiro Seiki's heat conductivity measuring machine Auto λHC-074, it was 2.1 to 2.4 mw / m · k, and the surface smoothness was also good. Good values were obtained.

(Example 2)
Next, Example 2 will be described. In the second embodiment, similarly to the first embodiment, a fusion part is provided in the fiber of the resin fiber layer 52a that becomes the core material 51 of the vacuum heat insulating material 50. The fiber of the resin fiber layer 52a is obtained by melting a polystyrene resin at 290 ° C. and fiberizing it by a melt blown method. When this fiber is formed, a resin fiber provided with a fused portion can be produced by adjusting the basis weight. The extrusion amount at this time is 5 kg / h, the fiber diameter of the fiber layer is 8 to 12 μm, the fusion part is 16 to 30 μm, and the basis weight is 350 to 400, so that the fusion part is provided in the middle of the fiber layer. be able to.

  With these configurations, the resin fiber layer 52a, the glass wool layer 52b, and the adsorbent, which become the core material 51, are wrapped in the inner bag material 53, and set in a vacuum packaging machine with the outer jacket material 54 having gas barrier properties, so that the degree of vacuum is 2.2 Pa. The pressure was reduced and the outer bag material 54 was sealed after holding at a degree of vacuum of 2.2 Pa or less for a certain time to obtain a vacuum heat insulating material. The heat conductivity of the vacuum heat insulating material obtained in this way was measured with a heat conductivity measuring device Auto λHC-074 manufactured by Eihiro Seiki Co., Ltd. and found to be 1.9 to 2.1 mw / m · k, and the surface smoothness was also good. A good value was obtained.

(Example 3)
Next, Example 3 will be described. In Example 3, as in Example 1, a fusion part is provided in the fiber of the resin fiber layer 52a that becomes the core material 51 of the vacuum heat insulating material 50. The fiber of the resin fiber layer 52a is obtained by melting a polystyrene resin at 290 ° C. and fiberizing it by a melt blown method. When this fiber is formed, a resin fiber provided with a fused portion can be produced by adjusting the extrusion amount of the resin. The extrusion rate at this time is 5 kg / h, and the surface of the resin fiber layer is fused by applying pressure at a temperature higher than the softening temperature to one surface of the resin fiber layer having a fiberized fiber diameter of 8 to 12 μm. Can be provided. In this embodiment, a fusion plate was provided by applying a pressure of 10 N / cm ² with a hot plate heated to 150 ° C. Thereby, a melt | fusion part can be 20-80 micrometers. With these configurations, the resin fiber layer 52a, the glass wool layer 52b, and the adsorbent, which become the core material 51, are wrapped in the inner bag material 53, and set in a vacuum packaging machine with the outer jacket material 54 having gas barrier properties, so that the degree of vacuum is 2.2 Pa. The pressure was reduced and the outer bag material 54 was sealed after holding at a degree of vacuum of 2.2 Pa or less for a certain time to obtain a vacuum heat insulating material. The heat conductivity of the vacuum heat insulating material obtained in this way was measured with a heat conductivity measuring device Auto λHC-074 manufactured by Eihiro Seiki Co., Ltd. and found to be 2.2 to 2.5 mw / m · k and good surface smoothness. A good value was obtained.

(Comparative Example 1)
Next, Comparative Example 1 will be described. In Comparative Example 1, a resin fiber layer having a fiber diameter of 7 to 11 μm without providing a fusion part in the core material is used, and the resin fiber layer, the glass wool layer, and the adsorbent that are core materials in this configuration are wrapped with an inner bag material, and a gas barrier is formed. The outer cover material was set in a vacuum packaging machine with a pressure characteristic, and the pressure was reduced to 2.2 Pa. After holding at a vacuum degree of 2.2 Pa or less for a certain period of time, the cover material was sealed to obtain a vacuum heat insulating material. When the heat conductivity of the vacuum heat insulating material obtained by this was measured by Eihiro Seiki Co., Ltd. thermal conductivity measuring machine Auto λHC-074, a good value of 1.8 to 2.0 mw / m · k was obtained. However, unevenness was observed in the surface smoothness.

(Application example)
Next, an application example in which the vacuum heat insulating material according to the embodiment of the present invention is applied to a refrigerator will be described with reference to FIGS. 3 and 4.

  The vacuum heat insulating material 50 is affixed to the outer box 21 made of steel plate, and the foam heat insulating material 23 of hard urethane foam is filled between the vacuum heat insulating material 50 and the inner box 22 of the refrigerator. If there are irregularities on the surface of the vacuum heat insulating material 50, there will be a gap between the outer box 21 and heat leakage will occur, or if there are irregularities, the adhesive strength with the outer box 21 will be weakened, It also causes peeling.

  As shown in FIG. 4, the refrigerator 1 shown in FIG. 3 includes a refrigerator room 2, an ice making room 3 a, an upper freezer room 3 b, a lower freezer room 4, and a vegetable room 5 from the top. In the following description, the ice making chamber 3 a, the upper freezing chamber 3 b, and the lower freezing chamber 4 may be collectively referred to as the freezing temperature zone 3.

  In FIG. 3, each storage chamber has a front opening, and a door for closing the front opening is provided. The refrigerator compartment 2 is provided with refrigerator compartment doors 6a and 6b that rotate around the hinge 10 and the like. Except for the refrigerator compartment doors 6a and 6b, they are drawer type doors, and an ice making compartment door 7a, an upper freezer compartment door 7b, a lower freezer compartment door 8, and a vegetable compartment door 9 are arranged. When these drawer doors are pulled out, the storage containers provided in the respective storage chambers are pulled out together. Moreover, the packing 11 for closely adhering to a refrigerator main body and sealing a front opening is attached to the indoor side outer periphery of each door.

  In addition, a heat insulating partition 12 is disposed to insulate the compartment between the refrigerator compartment 2, the ice making chamber 3a, and the upper freezer compartment 3b. This heat insulating partition 12 is a heat insulating wall having a thickness of about 30 to 50 mm, and is made of foamed polystyrene, foam heat insulating material (foamed urethane), vacuum heat insulating material, etc., each of which is used alone or in combination with a plurality of heat insulating materials. Is provided. Since the temperature zones are the same between the ice making chamber 3a and the upper freezing chamber 3b and the lower freezing chamber 4, a partition member 13 having a packing 11 receiving surface is provided instead of a partition heat insulating wall for partition heat insulation. Between the lower freezer compartment 4 and the vegetable compartment 5, a heat insulating partition 14 is provided to insulate the compartment, and similarly to the heat insulating partition 12, a heat insulating wall of about 30 to 50 mm, and similarly foamed polystyrene or foam heat insulating material. (Urethane foam), vacuum insulation, etc. That is, the partition heat insulation wall is installed in the partition 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 also particularly limited in terms of opening and closing by rotation, opening and closing by drawer, and the number of divided doors. It is not a thing.

  Next, the box 20 includes an outer box 21 and an inner box 22. In a space formed by the outer box 21 and the inner box 22, a heat insulating portion is provided to insulate each storage chamber in the box 20 from the outside. A vacuum heat insulating material 50 is arranged between the outer box 21 and the inner box 22, and a space other than the vacuum heat insulating material 50 is filled with the foam heat insulating material 23. The vacuum heat insulating material 50 is arrange | positioned so that the resin fiber layer 52a may be located in the affixing surface side to the outer box 21 or the inner box 22. FIG. Thereby, since a surface with high planar smoothness contacts outer box 21 or inner box 22, appearance design nature can be improved. Further, the sticking property is improved, and the reliability can be improved.

  In addition, a cooler 28 is provided on the back side of the freezing temperature zone 3 in order to cool each room such as the refrigerator compartment 2, the freezing temperature zone 3, and the vegetable room 5 of the refrigerator 1 to a predetermined temperature. . A refrigeration cycle is configured by connecting the cooler 28, the compressor 30, the condenser 31, and a capillary tube (not shown). Above the cooler 28, a blower 27 that circulates the cool air cooled by the cooler 28 in the refrigerator 1 and maintains a predetermined low temperature is disposed. Moreover, the heat insulation partitions 12 and 14 are each arrange | positioned as a heat insulating material which divides the refrigerator compartment 2, the freezing temperature zone room 3, the freezing temperature zone room 3, and the vegetable compartment 5 of the refrigerator 1. The heat insulation partitions 12 and 14 are the structures by which the expanded polystyrene 33 and the vacuum heat insulating material 50 are arrange | positioned inside. The heat insulating partitions 12 and 14 may be filled with a foamed heat insulating material 23 of urethane foam as long as the desired heat insulating performance is exhibited, and is not particularly limited to the foamed polystyrene 33 and the vacuum heat insulating material 50. .

  In addition, an interior lamp 45 having a case 45a protruding toward the foam insulation 23 is arranged on a part of the top surface of the inner box 22 so that the interior when the refrigerator door is opened is bright and easy to see. It is. The interior lamp 45 is not particularly limited, such as a light bulb, a fluorescent lamp, a xenon lamp, or an LED. Since the thickness of the foam heat insulating material 23 between the case 45a and the outer box 21 is reduced due to the arrangement of the interior lamp 45, the vacuum heat insulating material 50 is provided to ensure the heat insulating performance. The interior light 45 is not particularly specified to be disposed at the illustrated position, and includes, for example, the case where it is provided at an arbitrary position such as the left and right side walls, the back wall, and the bottom wall in the storage chamber.

  Further, although not shown in FIG. 4, a heat radiating pipe is attached to the lower surface of the outer box 21 on the top surface side of the box 20. Then, in consideration of the space occupied by the interior lamp case 45a described above, the space occupied by the heat radiating pipe disposed on the lower surface of the outer box 21 on the top surface, and the effect of heat release, the case 45a and the top surface side of the outer box 21 A heat insulating performance is secured by placing a vacuum heat insulating material between them.

  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 side of the foam heat insulating material 23, so that the internal volume is inevitably sacrificed in order to ensure the heat insulation thickness. If the internal volume is made larger, the thickness of the foam heat insulating material 23 between the recess 40 and the inner box 22 becomes thin. For this reason, the vacuum heat insulating material 50 is arrange | positioned in the surface at the side of the foam heat insulating material 23 of the recessed part 40, and heat insulation performance is ensured and strengthened.

  In the application example shown in FIG. 4, the vacuum heat insulating material 50 is a single vacuum heat insulating material 50 formed in a substantially Z shape so as to straddle the case 45 a of the interior lamp 45 and the electrical component 41. The cover 42 is made of a steel plate in consideration of heat resistance.

  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 50 is arranged.

  As the vacuum heat insulating material 50 in this application example, the vacuum heat insulating material 50 of Example 1 described above was used. In this application example, the resin fiber layer 52a is disposed on the high-temperature portion side such as the concave portion 40 in which the heat-dissipating pipe (not shown) and the electrical component 41 are disposed and the urethane heat insulating side so as not to be affected by heat. did.

  The arrangement portion is not particularly limited to this, and in order to suppress the heat generated from the compressor 30 and the condenser 31 from entering the interior, the compressor 30 and the condenser 31 toward the inner box 22 side. A vacuum heat insulating material 50 can also be disposed on the projection surface. In order to increase the covering area of the vacuum heat insulating material 50, it is possible to form a three-dimensional shape integrally formed from the bottom surface of the inner box 22 to between the compressor 30 and the cooler 28. In addition, about the shape of the vacuum heat insulating material 50 located between the compressor 30 and the cooler 28, the notch for escaping the drain pipe which is not shown in figure was provided. The presence or absence of a notch or its shape is not particularly limited.

As the vacuum heat insulating material 50 in this application example, the core material 51 having an overall thickness of 10 mm and a density of about 250 (kg / m ³ ) was used. By arranging the vacuum heat insulating material 50 on the top surface portion, it is possible to reduce the heat intrusion into the cabinet by the electric component 41 and the heat radiating pipe, further improve the heat radiation characteristics of the heat radiating pipe, and by arranging the vacuum heat insulating material 50 on the bottom surface. Since the heat generated from the compressor 30 and the condenser 31 can be prevented from entering the storage, the heat insulation performance can be improved without increasing the wall thickness.

  Next, an example different from the above embodiment will be described with reference to FIGS. 5 is a view showing an application example of the vacuum heat insulating material according to the embodiment of the present invention different from FIG. 2, and FIG. 6 is an application example of the vacuum heat insulating material according to the embodiment of the present invention different from FIG. FIG. In the figure, 21 is an outer box, 22 is an inner box, 23 is a foam heat insulating material, 50 is a vacuum heat insulating material, 52a resin fiber layer, 52b is a glass wool layer, 53 is an inner bag material, and 54 is a jacket material. These are members equivalent to the members described in FIGS.

  5 and 6 differ from FIGS. 1 to 4 above, the resin fiber layer 52a is the outside of the inner bag material 53, that is, the inner bag material, out of the resin fiber layer 52a and the glass wool layer 52b, which are organic fiber aggregates. 53 and the outer covering material 54. In other words, in this embodiment, the resin fiber layer 52 a shown in FIGS. 5 and 6 is positioned and disposed on the surface of the inner bag material 53. By doing so, it is possible to prevent the occurrence of a level difference due to the misalignment between the resin fiber layer 52a and the glass wool layer 52b, the damage of the jacket material 54 due to the resin fiber layer 52a, and the high cost by preventing the position shift. It is a thing.

  In FIG. 5, the resin fiber layer 52a shown in the figure is provided with a fusion part M on the organic fiber on the surface of the resin fiber layer 52a. As described with reference to FIGS. 1 to 4, the fused portion M has rigidity when the vacuum heat insulating material 50 is used, and has a function of smoothing the surface. And when the vacuum heat insulating material 50 is attached, it arrange | positions so that the fusion | fusion part M side may face the outer box 21 or the inner box 22, and the external appearance design property is improved.

  Further, the resin fiber layer 52 a is fixed to the surface side of the inner bag material 53 with an adhesive material 55. Further, the resin fiber layer 52a is formed with the fusion part M by adjusting the amount of resin extrusion so that the surface thereof becomes the fusion part M, or by heat compression with a hot plate. Further, the resin fiber layer 52a has a thin plate shape (board shape), the plate thickness is, for example, 1.0 to 5.0 mm, and the smoothness of the surface fused portion M is 1 mm or less. Here, the smoothness is the roughness of the surface of the fused part M, and the unevenness of the surface of the fused part M is formed to be 1 mm or less on average.

  Further, the resin fiber layer 52 a is made smaller than the outer dimensions of the glass wool layer 52 b in the inner bag material 53. Therefore, when the resin fiber layer 52a and the glass wool layer 52b are stacked, the outer periphery of the resin fiber layer 52a is smaller than the width of the outer periphery of the glass wool layer 52b, and does not protrude outward.

  Further, the P portion of the resin fiber layer 52a that is in direct contact with the jacket material 54 is chamfered or rounded so that the jacket material 54 is not damaged by burrs of the fused core material (resin fiber layer 52a). ing.

  In addition, the resin fiber layer 52a in this embodiment is formed in a thin plate shape in advance, and is inserted into the inner bag material 53. And the resin fiber layer 52a is affixed on the upper surface (the surface of the inner bag material 53) of the glass wool layer 52b, and after putting in the outer covering material 54, it is pressure-reduced including the inside of the inner bag material 53, and is a vacuum heat insulating material. 50.

  Further, in the configuration of FIG. 6, in order to position the resin fiber layer 52a which is an organic fiber, a recess is made on the inner bag material 53 side in which the glass wool layer 52b is put, and the resin fiber layer 52a is embedded in the recess. It is what I did. Thereby, the end surface P part of the resin fiber layer 52a is not in direct contact with the jacket material 54, and the jacket material 54 is not damaged. Further, the positioning of the resin fiber layer 52a can be performed reliably. In the case of the configuration of FIG. 6, the adhesive material 55 used in FIG. 5 may not be used.

Example 4
Next, still another embodiment will be described with reference to FIGS. 7 is a perspective view of the vacuum heat insulating material alone according to the embodiment of the present invention, FIG. 8 is a cross-sectional view of the vacuum heat insulating material shown in FIG. 7 taken along the line BB, and FIG. 9 is a vacuum shown in FIG. It is a figure which shows the example of application to the refrigerator door part of a heat insulating material.

  In the figure, 6a is a refrigerator compartment door, 23 is a foam heat insulating material, 50 is a vacuum heat insulating material, 52a is a resin fiber layer, 52b is a glass wool layer, 53 is an inner bag material, and 54 is a jacket material. These are members equivalent to the members described in FIGS. Moreover, although the vacuum heat insulating material 50 shown to this embodiment has shown the example applied to the refrigerator compartment door 6a, it is not restricted to this. For example, you may arrange | position along uneven | corrugated shaped parts, such as a machine room, a board | substrate storage part, and an illumination storage part.

  First, in FIG. 9, 6a is a refrigerator compartment door. The refrigerator compartment door 6a includes a door outer plate 61, a door inner plate 62, a vacuum heat insulating material 50, a foam heat insulating material 23 made of urethane foam or the like by in-situ foaming, and the like.

  Here, since the door outer plate 61 and the door inner plate 62 become design parts that can be visually recognized by the user, they are devised so that the outer appearance is not distorted when the foam heat insulating material 23 is filled. However, when the vacuum heat insulating material 50 is attached to the door outer plate 61 and the door inner plate 62, the influence of distortion may appear on the appearance. The present embodiment improves the appearance design.

  The vacuum heat insulating material 50 is attached to the door outer plate 61 and the door inner plate 62 in the same manner as the outer box 21 or the inner box 22 (see FIG. 4).

  Reference numeral 63 denotes a pocket portion formed between the rising portion 65 and the door inner plate 62. As shown in FIG. 9, bottles and foods in tubes are stored in the pocket portion 63. Reference numeral 64 denotes an escape portion provided at the rear portion of the pocket portion 63. The escape portion 64 is configured so that the stored food in the bottle can be pulled down without being pulled out.

  50 is a vacuum heat insulating material. 5 and 6, the vacuum heat insulating material 50 has a resin fiber layer 52a disposed outside the inner bag material 53, that is, between the inner bag material 53 and the jacket material 54. Yes. In other words, the resin fiber layer 52 a shown in FIGS. 5 and 6 is positioned and disposed on the surface of the inner bag material 53.

  By doing so, it is possible to prevent the occurrence of a step due to the stacking deviation between the resin fiber layer 52a and the glass wool layer 52b, and to prevent the outer covering material 54 from being damaged or misaligned by the resin fiber layer 52a.

  7 and 8, the resin fiber layer 52a shown in the figure is one in which a fusion part M is provided on the fiber on the surface of the resin fiber layer 52a. Note that, as described with reference to FIGS. 1 to 6, the fusion part M increases the rigidity of the vacuum heat insulating material 50 and smoothes the surface. And when the fusion | melting part M side attaches the vacuum heat insulating material 50, it arrange | positions so that the door outer plate 61 or the door inner plate 62 may be faced.

  The resin fiber layer 52 a is fixed to the surface side of the inner bag material 53 with an adhesive (not shown). Further, the resin fiber layer 52a is formed with the fusion part M by adjusting the amount of resin extrusion so that the surface thereof becomes the fusion part M, or by heat compression with a hot plate. Further, the resin fiber layer 52a has a thin plate shape (board shape), the plate thickness is, for example, 1.0 to 5.0 mm, and the smoothness of the surface fused portion M is 1 mm or less.

  Further, the resin fiber layer 52 a is made smaller than the outer dimensions of the glass wool layer 52 b in the inner bag material 53.

  Accordingly, when both are projected as shown in the figure, the outer periphery of the resin fiber layer 52a does not protrude beyond the outer periphery of the glass wool layer 52b.

  Furthermore, the P portion of the resin fiber layer 52a that is in direct contact with the jacket material 54 is chamfered or rounded so that the jacket material 54 is not damaged by burrs or the like of the fused core material (resin fiber layer 52a). ing. In addition, the resin fiber layer 52a in this embodiment has the convex-concave part which accepts the uneven | corrugated | grooved part provided in the door inner plate 62 or the door outer plate 61. FIG. That is, the vacuum heat insulating material 50 is provided with a concave portion, a convex portion, a curved shape and the like corresponding to a convex portion, a concave portion, a curved shape and the like of the door inner plate 62 or the door outer plate 61, respectively. Moreover, this convex-concave part is formed in the melt | fusion part M of the resin fiber layer 52a.

  The resin fiber layer 52 a having these configurations is formed in advance in a thin plate shape, and is provided on the surface of the inner bag material 53, that is, between the inner bag material 53 and the jacket material 54.

  Further, when the resin fiber layer 52 is placed in the outer cover material 54 together with the inner bag material 53, the inside of the outer cover material 54 is decompressed to form the vacuum heat insulating material 50, including the inner bag material 53. is there.

  Reference numeral 66 denotes a convex portion provided on the vacuum heat insulating material 50. The convex portion 66 has a shape that meets a relief portion 64 formed at the rear portion of the pocket portion 63. When the vacuum heat insulating material 50 is attached to the door inner plate 62, the projection 66 formed in advance in the shape of the relief portion 64 provided on the door inner plate 62 side is attached as shown in FIG. It is. After the attachment, the foam heat insulating material 23 is filled between the door inner plate 62 and the door outer plate 61.

  The convex portion 66 is formed by the fused portion M previously formed on the resin fiber layer 52a. By forming the convex portion 66 in the fused portion M, the glass wool layer 52b is flexibly deformed in accordance with the convex portion 66 when the convex portion 66 is put together with the glass wool layer 52b. In other words, the resin fiber layer 52a having the fused part M functions as a shape holding part when the three-dimensional vacuum heat insulating material 50 is obtained. Furthermore, even when the foam heat insulating material is filled, the shape of the convex portion 66 is strong enough to withstand the foaming pressure.

  The outline of the embodiment of the present invention is summarized as follows.

  First, a glass wool layer, an inner bag material that stores the glass wool layer, an outer jacket material that stores the inner bag material, and a resin fiber layer that is stored between the inner bag material and the outer jacket material And in the vacuum heat insulating material provided with a fusion part in which fibers are fused to the surface of the jacket material side of the resin fiber layer, the fusion part is smaller than the width of the glass wool layer, The shape is any one of a concave shape, a convex shape, a curved shape, or a combination thereof.

  In other words, by providing a fiber fusion part in the organic fiber layer, the rigidity of the fiber is increased when used as a vacuum heat insulating material, surface irregularities are reduced, surface smoothness is improved, and the vacuum heat insulating material is bonded to the application surface. In addition, the gap between the vacuum heat insulating material and the pasting portion can be reduced, heat leakage can be reduced, and a refrigerator having high heat insulating performance can be provided.

  Further, it is possible to prevent the inner bag material from being damaged by the heat-cured fused portion.

  Moreover, since the end surface of the fusion | melting part provided in the organic fiber layer is covered with the glass wool layer, it can prevent further damaging an inner bag material.

  Furthermore, in order to form the unevenness that conforms to the inner box shape, it is not necessary to use a conventional molding press or the like, and only three-dimensional molding of the resin fiber layer is sufficient. Moreover, workability | operativity and the damage of a jacket material can be reduced by providing the installation position of a resin fiber layer in the outer side of an inner bag material.

  Further, the resin fiber layer is a thin plate shape, and the smoothness of the fused portion is 1 mm or less. Therefore, when the vacuum heat insulating material is attached to the outer box or the inner box surface of the refrigerator, the outer box or the inner box does not pick up the irregularities on the surface of the vacuum heat insulating material and imitate the appearance accordingly.

  The diameter of the fiber of the resin fiber layer is 5 μm to 30 μm, and the fusion part is a bundle of 10 μm to 200 μm by fusing the fibers together. Thereby, when the contact part of a fiber increases and it is set as a vacuum heat insulating material, heat conductive performance will not deteriorate.

  The resin fiber layer is positioned by a depression on the glass wool layer side. Thereby, it can prevent damaging an inner bag material.

  Further, in the refrigerator in which a vacuum heat insulating material is disposed between the inner box and the outer box, the vacuum heat insulating material includes a glass wool layer, an inner bag material that stores the glass wool layer, and an outer bag that stores the inner bag material. A fused portion in which fibers are fused to a surface of the resin fiber layer on the outer jacket material side, and a resin fiber layer housed between the inner bag material and the outer jacket material The fused portion is smaller than the width of the glass wool layer, and the fused portion corresponds to any one of the convex shape, concave shape or curved shape of the inner box or the outer box, or a combination thereof. As described above, any one of a concave shape, a convex shape, a curved shape, or a combination thereof is provided, and is disposed so as to be in contact with the inner box or the outer box.

  This increases the rigidity of the fiber when used as a vacuum heat insulating material, reduces surface irregularities, improves surface smoothness, and when the vacuum heat insulating material is bonded to the application surface, the gap between the vacuum heat insulating material and the application part Can be provided, a heat leak can be reduced, and a refrigerator having high heat insulation performance can be provided.

  Furthermore, without the need for a conventional molding press or the like for forming uneven portions on the entire vacuum heat insulating material, the unevenness of the resin fiber layer alone is used as a reference for the unevenness of the resin fiber layer core. Since the uneven shape and the curved shape formed on the plate (or inner box surface) side and the door outer plate (or outer box surface) side can be covered with the vacuum heat insulating material, the cover ratio is improved.

DESCRIPTION OF SYMBOLS 1 Refrigerator 2 Refrigeration room 3a Ice making room 3b Upper freezing room 4 Lower freezing room 5 Vegetable room 12, 14 Heat insulation partition 20 Box 21 Outer box 22 Inner box 23 Foam heat insulating material 50 Vacuum heat insulating material 51 Core material 52a Resin fiber layer 52b Glass wool Layer 53 Inner bag material 54 Cover material 55 Adhesive material 61 Door outer plate 62 Door inner plate 63 Pocket portion 64 Escape portion 66 Convex portion

Claims (5)

A glass wool layer, an inner bag material that stores the glass wool layer, an outer jacket material that stores the inner bag material, and a resin fiber layer that is stored between the inner bag material and the outer jacket material. In vacuum insulation,
The surface of the resin fiber layer on the jacket material side has a fusion part where fibers are fused together, and the fusion part is smaller than the width of the glass wool layer and has any of a concave shape, a convex shape or a curved shape. A vacuum heat insulating material characterized by having a shape of one or a combination thereof.   2. The vacuum heat insulating material according to claim 1, wherein the resin fiber layer has a thin plate shape, and the smoothness of the fused portion is 1 mm or less.   The diameter of the fiber of the resin fiber layer is 5 μm to 30 μm, and the fusion part is a bundle of 10 μm to 200 μm by fusing the fibers together. Vacuum insulation.   The vacuum heat insulating material according to any one of claims 1 to 3, wherein the resin fiber layer is positioned by a depression on the glass wool layer side. In the refrigerator where the vacuum heat insulating material is arranged between the inner box and the outer box,
The vacuum heat insulating material includes a glass wool layer, an inner bag material that stores the glass wool layer, an outer jacket material that stores the inner bag material, and a resin that is stored between the inner bag material and the outer jacket material. A fiber layer,
The resin fiber layer has a fusion part in which fibers are fused to the surface of the jacket material side, the fusion part is smaller than the width of the glass wool layer, and the fusion part is the inner box or the The outer box has a concave shape, a convex shape, a curved shape, or a combination thereof, corresponding to any one of the convex shape, concave shape or curved shape of the outer box, or a combination thereof. A refrigerator characterized by being placed in contact with an inner box or the outer box.