JP2018100742A - Vacuum heat insulation material and refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vacuum heat insulation material capable of efficiently radiating heat from a heat radiation pipe to an outer box, and improving heat insulation performance.SOLUTION: A vacuum heat insulation material includes a core material made of inorganic fiber, and a jacket material which covers the core material to seal the inside under reduced pressure, and is such that: the core material is formed by laminating a first laminate, a second laminate and a third laminate; the first laminate has a rectangular first recessed part; the second laminate has a semicircular second recessed part combined with the first recessed part; and the surface part of the third laminate corresponding to the first recessed part or the second recessed part is flat. A refrigerator includes the vacuum heat insulation material, and a radiation pipe disposed to the first recessed part and the second recessed part of the vacuum heat insulation material.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a vacuum heat insulating material and a refrigerator provided with the vacuum heat insulating material.

  Conventionally, a vacuum heat insulating material used for a refrigerator or the like is manufactured by covering a core material such as glass wool with a covering material such as a film having a high gas barrier property and sealing the inside under reduced pressure. For example, there exists a thing of patent document 1. FIG. FIG. 7 is a cross-sectional view showing the side wall of the heat insulating box of the refrigerator described in Patent Document 1. As shown in FIG.

  As shown in FIG. 7, the vacuum heat insulating material 32 is provided in contact with the outer box 3, and the heat radiating pipe 30 is attached in the groove portion 71 of the vacuum heat insulating material 32. Opposite the groove 71, the vacuum heat insulating material 32 has a convex portion 70 that is wider than the groove 71 in the longitudinal direction. In the vacuum heat insulating material 32, the thickness of the vacuum heat insulating material 32 in the vicinity of the groove 71 can be secured. The vacuum heat insulating material 32 encloses the core material 20 and covers the outer side with an outer covering material 72. In the jacket material 72, the jacket material 72b on the convex portion 70 side includes an aluminum foil, and the jacket material 72a on the groove portion 71 side includes a jacket material that does not include the aluminum foil. Further, in the jacket material 72c, the inside is reduced-pressure sealed by heat welding between the jacket material 72a and the jacket material 72b.

  The side wall of the heat insulating box of the refrigerator is composed of an inner box 50, a foam heat insulating material 51, a vacuum heat insulating material 32, a partial heat radiating pipe 30, and an outer box 3 when the left side in FIG. .

  Further, there is a vacuum heat insulating material described in Patent Document 2. FIG. 8 is a schematic cross-sectional view of the vacuum heat insulating material described in Patent Document 2.

  As shown in FIG. 8, the vacuum heat insulating material 32 includes the core material 20, and stores the stacked core material 20 in the inner bag 74 and the outer bag 76, and then compresses and seals the inside thereof under reduced pressure. Thus, two recesses 75 (a recess 75a and a recess 75b) in which a heat radiating pipe or the like is stored are formed.

JP 2008-64323 A JP 2012-62904 A

  However, the vacuum heat insulating material of patent document 1 (FIG. 7) has a convex part with a width | variety perpendicular | vertical to a longitudinal direction wider than the groove part also in the back surface of the surface which provided the groove part in which a heat radiating pipe is fitted. Therefore, although the thickness of a convex part is needed, when arrange | positioning a vacuum heat insulating material in a refrigerator etc., in order to ensure the capacity | capacitance in a refrigerator large recently, the clearance gap between the refrigerator inside and a vacuum heat insulating material is small. . Therefore, there is a problem that the convex portion interferes with the wiring or parts of the refrigerator, or the path of foaming of the hard urethane foam becomes narrow, and the hard urethane foam cannot be poured into every corner.

  Moreover, in the vacuum heat insulating material of patent document 2 (FIG. 8), it has a recess also on the opposite side in the thickness direction with the recess of the surface which arrange | positions a thermal radiation pipe. Therefore, the thickness of the part as a vacuum heat insulating material is twice as thin as the recess compared to the other parts, so that there is a problem that the heat insulating performance is lowered.

  Accordingly, an object of the present invention is to solve the above-described conventional problems, and while reducing the heat insulation performance due to the concave shape of the surface on which the heat radiating pipe is disposed while ensuring the necessary thickness as the vacuum heat insulating material. It is an object of the present invention to provide a vacuum heat insulating material that does not occur and a refrigerator that uses the vacuum heat insulating material.

  In order to achieve the above object, a core material composed of inorganic fibers, and a covering material that covers the core material and seals the inside under reduced pressure, the core material includes the first laminate, the second laminate, A laminated body and a third laminated body are laminated, the first laminated body has a rectangular first concave portion, and the second laminated body has a semicircular second concave portion combined with the first concave portion. And a portion of the surface of the third laminate corresponding to the first recess or the second recess uses a flat vacuum heat insulating material. Moreover, the refrigerator containing the said vacuum heat insulating material and the heat radiating pipe arrange | positioned at the said 1st recessed part and the said 2nd recessed part of the said vacuum heat insulating material is used.

  According to the refrigerator equipped with the vacuum heat insulating material and the vacuum heat insulating material of the present invention, the heat insulating performance as a vacuum heat insulating material is not deteriorated, and the heat from the heat radiating pipe is efficiently radiated to the outer box. Therefore, the heat insulation performance can be improved.

Schematic perspective view of a refrigerator in an embodiment of the present invention The schematic perspective view of the vacuum heat insulating material in embodiment of this invention (A) Partial sectional view of the vacuum heat insulating material in the embodiment of the present invention, (b) Partial sectional enlarged view of the vacuum heat insulating material in the embodiment of the present invention Partial sectional view of conventional vacuum insulation (A) Schematic of core material raw cotton in the embodiment of the present invention, (b) Cross-sectional view after cutting each core material in the embodiment of the present invention (A) Schematic layout diagram after cutting each core material regarding the vacuum heat insulating material manufacturing process in the embodiment of the present invention, (b) Outer material storage state schematic diagram regarding the vacuum heat insulating material manufacturing process in the embodiment of the present invention, (C) Schematic explanatory diagram of vacuum insulation material molding and thermal welding related to the vacuum insulation material manufacturing process in the embodiment of the present invention Sectional drawing which shows the side wall of the heat insulation box of the refrigerator of patent document 1 Schematic sectional view of the vacuum heat insulating material of Patent Document 2

  Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment)
FIG. 1 is a schematic perspective view of a refrigerator in the embodiment of the present invention. FIG. 2 is a schematic perspective view of the vacuum heat insulating material in the embodiment of the present invention.

  As shown in FIG. 1, the refrigerator 1 includes a front door 2 that is a door that opens and closes to enter each storage room.

  The outer box 3 includes a side wall 3A of the outer box in which a U-shaped groove is processed, an upper wall 3B of the outer box, a rear wall 3C of the outer box, a rear upper wall 3D of the outer box, and a bottom surface of the outer box. A wall 3E is provided and is configured in a box shape.

  Although omitted in FIG. 1, there is an inner box inside the outer box 3, a heat insulating portion is provided in the space between the outer box 3 and the inner box, and each storage chamber in the inner box and the outside Is insulated. A vacuum heat insulating material 10 is partially disposed in a space between the outer box 3 and the inner box, and a space other than the vacuum heat insulating material 10 is filled with a foam heat insulating material such as rigid urethane foam.

  The side wall 3A of the outer box 3, the upper wall 3B of the outer box, and the rear wall 3C of the outer box are made of a steel plate metal, and the rear upper wall 3D of the outer box 3 is made of a polystyrene resin molded product or the like. The bottom wall 3E of the outer box 3 is made of steel plate metal or the like.

  The inner box is made of acrylonitrile, butadiene, a styrene copolymer synthetic resin molded article or the like.

  Inside the side wall 3A of the outer box 3, the upper surface wall 3B of the outer box 3, and the back wall 3C of the outer box 3, a heat radiating pipe 30 is disposed, and the side wall 3A of the outer box 3 and the outer box 3 Heat in the heat radiating pipe 30 is released to the outside through a metal plate made of steel that covers the top wall 3B and the back wall 3C of the outer box 3.

<Vacuum insulation 10>
As shown in FIG. 2, a plurality of recesses 11 are arranged in parallel on one surface of the vacuum heat insulating material 10 in the embodiment of the present invention. A heat radiating pipe 30 is fitted into the recess 11. As will be described below, the recess 11 includes a first recess 11a and a second recess 11b.

  FIGS. 3A and 3B are a partial cross-sectional view and a partial cross-sectional enlarged view of the vacuum heat insulating material 10 according to the embodiment of the present invention. 4 (a) and 4 (b) are partial sectional views of a conventional vacuum heat insulating material 10. FIG.

  As shown in FIG. 3A, the vacuum heat insulating material 10 is configured to include a core material 20, a jacket material 13 that covers the core material 20, and a jacket material 14.

  Although omitted in FIG. 3A, an adsorbent for adsorbing moisture and gas inside the vacuum heat insulating material 10 may be added.

<Coating materials 13, 14>
The outer covering material 13 in which the plurality of first concave portions 11a and second concave portions 11b are formed is composed of at least three layers such as a surface protective layer, a gas barrier layer, and a heat welding layer, and has a thickness of about 0.1 mm. is there.

  The surface protective layer is made of nylon resin, the gas barrier layer is made of aluminum foil, and the heat welding layer is made of polyethylene resin.

  The jacket material 14 is composed of at least four layers such as a surface protective layer, a gas barrier layer, and a heat welding layer, and has a thickness of about 0.1 mm.

  The surface protective layer is made of nylon resin, the gas barrier layer is made of aluminum vapor deposition and polyethylene terephthalate resin or ethylene-vinyl alcohol copolymer resin, and the heat welding layer is made of polyethylene resin.

  Note that the layer configuration and material of the jacket material 14 are not particularly limited thereto. For example, a metal other than aluminum for the gas barrier layer or another coating layer with high thermal conductivity may be used.

<Core material 20>
As the core material 20, glass wool having an average fiber diameter of about 4 μm of a laminate composed of an aggregate of inorganic fibers is used.

  The core material 20 has a configuration in which the first laminated body 21, the second laminated body 22, and the third laminated body 23 are laminated. The thickness T1 of the first laminated body 21 and the thickness of the second laminated body 22 are configured. T2 is the same dimension.

  Here, although demonstrated with the manufacturing method of a heat insulating material later, from the core material 20 with the same thickness cut | disconnected from the core raw material cotton (raw material of the core material 20) manufactured in roll shape, the 1st laminated body 21, the second laminated body 22, and the third laminated body 23 are produced.

  For example, the thickness T1 of the first stacked body 21 is 2 mm, and the thickness T2 of the second stacked body 22 is also 2 mm. The thickness T3 of the third stacked body 23 is thicker than the thickness of the first stacked body 21 and the second stacked body 22. In this example, the thickness T3 of the third laminated body 23 is set to 8 mm by laminating four first laminated bodies 21.

  In addition, it is preferable to use a thinner material and to form the first laminate 21 and the second laminate 22 from one core raw cotton. It is not good from the viewpoint of heat insulation if it is made of a thin core raw cotton and has a plurality of layers.

  Accordingly, the total number of laminated core members 20 is six, and the total thickness is 12 mm. Note that the thickness T3 of the third laminated body 23 may be larger than the thickness of the first laminated body 21 and the second laminated body 22, and is particularly limited as long as the heat insulation performance as the vacuum heat insulating material 10 does not deteriorate. do not do.

  Moreover, the 1st laminated body 21 is carrying out the shape cut | disconnected perpendicularly | vertically with respect to the thickness of the 1st laminated body 21 so that the cross section may become the 1st recessed part 11a with a square shape. The 2nd laminated body 22 has the 2nd recessed part 11b whose cross section is semicircular. This is combined with the first recess 11 a and the second recess 11 b and follows the shape of the heat radiating pipe 30. Note that the third stacked body 23 has no recess corresponding to the first recess 11a and the second recess 11b. That portion of the third laminate 23 is a plane. The 3rd laminated body 23 is a part which ensures thickness in order to ensure heat insulation performance. In addition, it is preferable from a heat insulation viewpoint that the surface facing the 2nd laminated body 22 of the 3rd laminated body 23 is a plane.

  On the other hand, FIG. 4 shows a conventional vacuum heat insulating material 32 in the inner box 50. In the conventional vacuum heat insulating material 32 as shown in FIG. 4, when the concave portion 12 is large, an aluminum tape 31 for efficiently radiating heat from the heat radiating pipe 30 to the outer box 3 is required. However, according to the vacuum heat insulating material 10 in the above embodiment, the outer cover material 13 plays the role, so the aluminum tape 31 is not necessary, and the cost can be reduced.

  Moreover, in the conventional vacuum heat insulating material 32 of FIG. 4, when the recessed part 12 into which the heat radiating pipe 30 is fitted is large, the volume of the vacuum heat insulating material 32 decreases, and further, as the number of the recessed parts 12 increases, the vacuum heat insulating material. The heat insulation performance as 32 falls. However, since the vacuum heat insulating material 10 in the embodiment does not have an extra space between the vacuum heat insulating material 10 and the heat radiating pipe 30, the volume of the vacuum heat insulating material can be increased as compared with the conventional one, and the first recess 11 a, Even if the number of the two concave portions 11b increases, the heat insulating performance as a vacuum heat insulating material is not deteriorated.

  Here, the vacuum heat insulating material 32 of FIG. 4 will be described. As shown in FIG. 4, the conventional vacuum heat insulating material 32 has the structure which has the core material 20, the jacket material 13 and the jacket material 14 which coat | cover the core material 20, and is the structure similar to embodiment. is there. Conventionally, the recess 12 is pressure-molded with a pressure jig having a convex shape along the recess 12 after the inside of the vacuum heat insulating material 32 is sealed under reduced pressure.

  As in the conventional vacuum heat insulating material 32 as shown in FIG. 4, the reason why the concave portion 12 must be large is that the outer covering material 13 is stretch-molded by pressure molding, so that the concave portion 12 has a small shape. This is because there are problems such as tearing.

  Further, the vacuum heat insulating material 32 manufactured as described above is provided in contact with the outer box 3, and an aluminum tape is provided in the recess 12 of the vacuum heat insulating material 32 so that the heat radiating pipe 30 improves the heat dissipation of the refrigerant. 31 is attached to the outer box 3. The space between the outer box 3, the above-described vacuum heat insulating material 32, and the inner box 50 is filled with a foam heat insulating material 51.

<Other features>
Here, in addition, the characteristic features of the embodiment will be described with reference to FIGS. 3 (a) and 3 (b).

  As described above, as shown in FIG. 3A, the core member 20 has a configuration including the first laminate 21, the second laminate 22, and the third laminate 23. The first laminate The thickness T1 of 21 and the thickness T2 of the second laminated body 22 have the same dimensions.

 For example, the thickness T1 of the first laminated body 21 is 2 mm, and the thickness T2 of the second laminated body 22 is also 2 mm. Each core material raw cotton (raw material of the core material 20) as shown in FIG. As in the manufacturing method, the first laminate 21 and the third laminate 23 are cut perpendicular to the thickness, while the second laminate 22 is cut at an angle of 45 ° with respect to the thickness.

 That is, it does not become a semicircular shape along the shape of the heat radiating pipe 30 as shown in FIGS. 3 (a) and 3 (b). However, as shown in FIG. 6C, which will be described later, an oblique 45 ° portion is formed in a semicircular shape as in the vacuum heat insulating material manufacturing method. In addition, the shaping | molding part 24 (periphery of the 2nd recessed part 11b) of the 2nd laminated body 22 may be shape | molded separately after cut | disconnecting the 2nd laminated body 22 besides shaping | molding in the case of a vacuum heat insulating material manufacturing method. .

The molded portion 24 of the second laminated body is different in density from the other unmolded first laminated body 21, second laminated body 22, and third laminated body 23. Specifically, in the case where the diameter of the heat radiating pipe 30 is 4 mm and the thickness of the second laminated body 22 is 2 mm, the case is oblique 45 ° before the molding of the molded portion 24 of the second laminated body 22 in FIG. sectional area of is a 2 mm ^2, the cross-sectional area of the final semicircular ^becomes 2mm ² -1.14mm ² = 0.86mm ^2.

  Therefore, the molded part 24 of the molded second laminate is compression-molded as compared with the other unmolded first laminate 21, second laminate 22, and third laminate 23. Only the portion 24 has a density that is 57% higher. However, the conventional vacuum heat insulating material 32 as shown in FIG. 4 is compression-molded in a larger shape as shown in the recess 12 as described above. Therefore, the vacuum heat insulating material 10 in the embodiment of the present invention can further improve the heat insulating performance as compared with a conventional vacuum heat insulating material or the like.

<Method for manufacturing heat insulating material>
Fig.5 (a) is the schematic of the core raw material cotton in embodiment, FIG.5 (b) is sectional drawing after each core material cutting | disconnection in embodiment of this invention.

  FIG. 6 (a) is a schematic layout diagram after cutting each core material regarding the vacuum heat insulating material manufacturing process in the embodiment of the present invention, and FIG. 6 (b) is a vacuum heat insulating material manufacturing process in the embodiment of the present invention. FIG. 6 (c) is a schematic explanatory diagram of vacuum heat insulating material forming and heat welding related to the vacuum heat insulating material manufacturing process in the embodiment of the present invention.

  As shown to Fig.5 (a), the core raw material cotton 60 (raw material of the core material 20) of thickness 2mm of roll shape is cut | disconnected to the aggregate | assembly of an inorganic fiber, and a some laminated body is manufactured. As shown in FIG. 5B, the first laminate 21 is cut perpendicular to the thickness. Similarly, the second laminated body 22 is cut at an angle of 45 ° with respect to the thickness (the vertical axis may be an object of 45 °). Further, the third laminated body 23 is cut perpendicularly to the thickness in the same manner as the first laminated body 21.

  Next, as shown to Fig.6 (a), the 3rd laminated body 23 is laminated | stacked on 4 sheets, and the 2nd laminated body 22 is laminated | stacked 1 sheet | seat so that a cut surface may become object, and 1st laminated | stacked on it The body 21 is laminated so that the concave portions can be formed.

  As shown in FIG. 6 (b), in order to maintain the above-described arrangement configuration, the product is stored in a bag composed of the jacket material 13 and the jacket material 14 while using a jig or the like.

  As shown in FIG. 6C, the first laminated body 21, the second laminated body 22, and the third laminated body 23 housed in a bag composed of the jacket material 13 and the jacket material 14 are subjected to pressure treatment. While applying pressure with the tool 61, the pressure is reduced. Next, the entire opening of the bag formed of the jacket material 13 and the jacket material 14 is thermally welded and sealed by the heat welding machine 62, and the vacuum heat insulating material 10 is manufactured.

<Effect>
From the above results, by providing the vacuum heat insulating material of the present embodiment, the heat insulating performance as a vacuum heat insulating material is not lowered, and the heat from the heat radiating pipe can be efficiently radiated to the outer box, and the heat insulating performance is improved. It can be improved further.

The vacuum heat insulating material of the present invention can be widely used as a refrigerator, a jar pot, a heat insulating wall for construction, and the like that further improve the heat insulating performance.

DESCRIPTION OF SYMBOLS 1 Refrigerator 2 Front door 3 Outer box 3A Side wall 3B Top wall 3C Rear wall 3D Rear upper wall 3E Bottom wall 10 Vacuum heat insulating material 11 Recess 11a 1st recessed part 11b 2nd recessed part 12 Recessed part 13 Cover material 14 Cover material 20 Core Material 21 1st laminated body 22 2nd laminated body 23 3rd laminated body 24 Molding part 30 Radiation pipe 31 Aluminum tape 32 Vacuum heat insulating material 50 Inner box 51 Foam heat insulating material 60 Core material raw cotton 61 Pressure jig 62 Thermal welding machine 70 Convex part 71 Groove parts 72, 72a, 72b, 72c Outer covering material 74 Inner bag 75, 75a, 75b Recess 76 Outer bag

Claims (9)

A core composed of inorganic fibers;
Covering the core material, and covering the inner material under reduced pressure,
The core material is laminated with a first laminate, a second laminate, and a third laminate,
The first laminate has a first rectangular recess.
The second laminate has a semicircular second recess combined with the first recess,
A part of the surface of the third laminate corresponding to the first recess or the second recess is a vacuum heat insulating material that is a flat surface. The first laminate, the second laminate, and the third laminate are laminated in this order,
The vacuum heat insulating material according to claim 1, wherein a surface of the third stacked body facing the second stacked body is a flat surface. The thickness of the said 3rd laminated body is a vacuum heat insulating material of Claim 1 or 2 thicker than the thickness of said 1st laminated body and said 2nd laminated body. The vacuum heat insulating material according to any one of claims 1 to 3, wherein the first laminated body and the second laminated body have the same thickness. The vacuum heat insulating material according to any one of claims 1 to 4, wherein a density around the second concave portion of the second laminated body is higher than that of other portions of the second laminated body. The vacuum heat insulating material according to any one of claims 1 to 5, wherein a density of a peripheral portion of the second recess of the second stacked body is different from a density of the first stacked body and the third stacked body. The jacket material on the first laminated body and the second laminated body side among the jacket materials is a metal layer composed of a gas barrier layer and a heat fusion layer. The vacuum heat insulating material described in 1. The vacuum heat insulating material according to claim 7, wherein the metal layer is made of an aluminum foil. The vacuum heat insulating material according to any one of claims 1 to 8,
The refrigerator containing the heat radiating pipe arrange | positioned at the said 1st recessed part and the said 2nd recessed part of the said vacuum heat insulating material.

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