JP2019168001A - Vacuum heat insulating material and refrigerator using vacuum heat insulating material - Google Patents

Abstract

To provide a vacuum heat insulating material capable of securing heat insulating performance over a long term with cost increase suppressed, and a refrigerator using the vacuum heat insulating material.SOLUTION: A vacuum heat insulating material 10 comprises a core material 30 and a jacket material 14 that stores the core material 30 and holds the inside in a decompressed state. The core material 30 comprises a pair of first sheet bodies 32 and 33 that are made of a fiber assembly and are arranged so as to face the jacket material 14, and a second sheet body 34 that is made of a fiber assembly and is arranged between the first sheet bodies 32 and 33. The first sheet bodies 32 and 33 are those in which the weight ratio of foreign matters contained in the fiber assembly having a predetermined volume is smaller than that of the second sheet body 34.SELECTED DRAWING: Figure 4

Description

  Embodiments of the present invention relate to a vacuum heat insulating material and a refrigerator using the vacuum heat insulating material.

  In recent years, a refrigerator in which a vacuum heat insulating material is disposed inside a heat insulating wall constituting a heat insulating box is known. For example, Patent Documents 1 and 2 disclose a vacuum heat insulating material that includes a core material and a jacket material that covers the core material, and the inside of the jacket material is sealed under reduced pressure. When a fiber aggregate of an inorganic material is used as the core material, foreign matters such as unfiberized materials and metal pieces larger than the fibers constituting the core material are likely to be mixed.

  When such a foreign material is sealed under reduced pressure inside the jacket material together with the core material, the foreign material may come into close contact with the jacket material and damage the jacket material, so that the heat insulation performance is likely to deteriorate. Although it is conceivable to form the entire core using a fiber assembly from which foreign matters have been removed, it takes time to remove the foreign matters and costs high.

JP 2012-159144 A Japanese Patent Laying-Open No. 2015-40674

  Then, it aims at providing the refrigerator using the vacuum heat insulating material and vacuum heat insulating material which can ensure heat insulation performance over a long term, suppressing cost increase.

  The vacuum heat insulating material of this embodiment is a vacuum heat insulating material provided with a core material and an outer jacket material that houses the core material and holds the inside in a reduced pressure state. A pair of first sheet bodies disposed opposite to the jacket material, and a second sheet body formed of a fiber assembly and disposed between the first sheet bodies, wherein the first sheet body is a predetermined one The weight ratio of the foreign matter contained in the volume fiber assembly is smaller than that of the second sheet body.

  The refrigerator of this embodiment is a refrigerator in which a vacuum heat insulating material is disposed between an outer box and an inner box. The vacuum heat insulating material stores a core material and the core material, and holds the inside in a reduced pressure state. The core material is formed of a fiber assembly and is disposed between the pair of first sheet bodies disposed opposite to the jacket material and the first sheet body. The first sheet body has a smaller weight ratio of foreign matters contained in the fiber assembly having a predetermined volume than the second sheet body.

Sectional drawing of the refrigerator provided with the vacuum heat insulating material which concerns on 1st Embodiment. The top view of the vacuum heat insulating material which concerns on 1st Embodiment. AA sectional drawing of FIG. The principal part enlarged view of FIG. The principal part expanded sectional view of the vacuum heat insulating material which concerns on 2nd Embodiment.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described based on the drawings.

  The present embodiment is a refrigerator in which a vacuum heat insulating material 10 is used in a refrigerator body 1 in which a storage chamber 7 is formed.

  Specifically, as shown in FIG. 1, the refrigerator main body 1 constitutes a housing of the refrigerator, and is a heat insulating space formed between a steel plate outer box 2 and a synthetic resin inner box 3. 4 is provided.

  A vacuum heat insulating material 10 is bonded and fixed to the heat insulating space 4 side of the outer box 2 with a heat radiating pipe P interposed therebetween, and a foam heat insulating material 5 made of polyurethane foam is formed in the gap between the outer box 2 and the inner box 3. In the state where the heat radiating pipe P is disposed on the heat insulating space 4 side of the outer box 2 and the vacuum heat insulating material 10 is disposed on the inner side of the heat radiating pipe P, the outer case 2 is injected. And the inner box 3 is integrated.

  As shown in FIG. 2, the vacuum heat insulating material 10 is formed in a rectangular plate shape having long side portions corresponding to the vertical direction of the refrigerator body 1 according to the shape of the left and right side surfaces of the outer box 2. As shown in FIG. 3, the vacuum heat insulating material 10 includes a core material 30, a jacket material 14 that houses the core material 30 and holds the inside in a reduced pressure state, and a recessed groove that is recessed in the thickness direction of the core material 30. 20 and 22.

  The jacket material 14 is a bag-like member made of a laminated film having a gas barrier property in which a plurality of films are laminated. The covering material 14 is made of, for example, a laminated film having a three-layer structure in which a surface protective layer, a gas barrier layer, and a heat welding layer are laminated in order from the outside toward the inside. The surface protective layer can be formed of a relatively heat-resistant synthetic resin such as polyethylene terephthalate. The gas barrier layer can be formed of, for example, a metal deposit (eg, an aluminum deposit obtained by depositing aluminum on a resin film) or a metal foil (eg, aluminum foil). As a heat welding layer, it can form with the synthetic resin which has heat welding property, such as a high density polyethylene, for example. In addition, the structure of the laminated | multilayer film which comprises the jacket material 14 will not be specifically limited if it has gas barrier property and can be heat-seal | fused. Although the thickness of the jacket material 14 is thinner than the thickness of the core material 30 and the depth dimension of the concave grooves 20 and 22, the thickness of the jacket material 14 in the drawing is easy to understand. Is shown enlarged.

  The concave grooves 20 and 22 are provided on one surface of the vacuum heat insulating material 10, specifically, one surface facing the outer box 2. The concave groove 20 is a concave portion that is recessed in the thickness direction of the vacuum heat insulating material 10 that extends along the long side direction of the vacuum heat insulating material 10. In the present embodiment, two concave grooves 20 are provided at intervals in the left-right direction. . As shown in FIG. 3, the groove 20 has a depth D <b> 1 after evacuation larger than the outer diameter of the heat radiating pipe P, and forms a space in which the heat radiating pipe P is disposed with the outer box 2. The concave groove 22 is a concave portion extending along the peripheral edge of the vacuum heat insulating material 10 and has an L-shaped cross section that opens outward from the vacuum heat insulating material 10. The depth D2 of the recessed groove 22 after evacuation is set to the same depth as the recessed groove 20.

  The core member 30 includes a pair of first sheet bodies 32 and 33 disposed so as to face the jacket material 14 and a second sheet body 34 disposed between the pair of first sheet bodies 32 and 33. . Of the pair of first sheet bodies 32, 33, the thickness T <b> 1 of one first sheet body 32 provided with the recessed grooves 20, 22 and facing the outer box 2 is opposed to the foam heat insulating material 5. The thickness of the other first sheet body 33 arranged in a thicker manner than the thickness T2 is provided.

  The first sheet bodies 32 and 33 and the second sheet body 34 are made of a fiber assembly having flexibility, for example, a fiber assembly in which glass fibers (glass wool) having a fiber diameter of about several μm are formed into a sheet shape. The first sheet bodies 32 and 33 are made of a fiber assembly in which the weight ratio of foreign matters contained in the fiber assembly having a predetermined volume is smaller than that of the fiber assembly constituting the second sheet body 34.

  Here, the foreign matter refers to what is called a shot (non-fibrous granular material) having a large fiber diameter or particle size among fiber aggregates constituting the first sheet bodies 32 and 33 and the second sheet body 34, or fiber aggregates. It is a metal piece mixed in the body. The weight ratio of the foreign matter is a mixer of a test piece obtained by cutting a fiber assembly into a constant volume (for example, a test piece obtained by cutting out the first sheet bodies 32 and 33 and the second sheet body 34 provided at a constant thickness into 100 mm square). It can be measured from the weight ratio of the foreign matter to the test piece, with the crushed piece exceeding 50 μm as a foreign matter.

  In addition, the fiber assembly which comprises the 1st sheet bodies 32 and 33 and the 2nd sheet body 34 other than the above-mentioned glass fiber, various inorganic fibers, such as ceramic fiber and rock wool, polystyrene, polyethylene terephthalate, polypropylene, etc. An organic resin fiber or the like made from the above can be used, and a fiber having a fiber diameter of about 1 to 30 μm can be used.

  Here, as an example of the dimensions of the vacuum heat insulating material 10, the depth D1 of the concave groove 20 is 4 to 8 mm, the depth D2 of the concave groove 22 is 4 to 8 mm, and the concave groove 20 is provided after evacuation. The thickness T1 of one first sheet body 32 is 6 to 14 mm, the thickness T2 of the other first sheet body 33 arranged opposite to the foamed heat insulating material 5 is 4 to 12 mm, the recessed groove 20 and the recessed groove 22. The thickness T3 of the first sheet body 32 at the bottom of the sheet can be 2 to 6 mm. In addition, it is preferable that the thickness of the 1st sheet | seat body 32 is at least 2 mm or more in any position after evacuation.

  As shown in FIG. 4, the vacuum heat insulating material 10 having such a configuration has one first sheet body 32 provided thicker than the other first sheet body 33, with the outer cover material 14 interposed therebetween. An adhesive is applied to the surface of the outer cover material 14 that is disposed so as to face the box 2 and faces one of the first sheet bodies 32, and is bonded and fixed to the outer box 2.

  Next, the manufacturing method of the above-described vacuum heat insulating material 10 will be described.

  First, glass fibers are formed into a predetermined sheet shape corresponding to the shape of the vacuum heat insulating material 10 to produce the first sheet bodies 32 and 33 and the second sheet body 34.

  Specifically, the first sheet bodies 32 and 33 are produced using glass fibers from which foreign substances have been removed by performing a step of removing foreign substances on glass fibers manufactured by, for example, a centrifugal method or a flame method. . The second sheet body 34 is manufactured using glass fibers that have been manufactured by, for example, a centrifugal method or a flame method and have not been subjected to a step of removing foreign matter.

  In addition, the method of removing a foreign material from the manufactured glass fiber is not specifically limited, For example, it can carry out by isolate | separating the foreign material with larger specific gravity than glass fiber by stirring glass fiber in water.

  Next, the second sheet body 34 is disposed between the obtained pair of first sheet bodies 32 and 33 to form the core material 30. The first sheet bodies 32 and 33 and the second sheet body 34 may be fixed by fixing means such as needling.

  Next, the obtained core material 30 is accommodated in the bag-shaped outer covering material 14. Since the pair of first sheet bodies 32, 33 constitute the outer surface of the core material 30, the first sheet bodies 32, 33 face the jacket material 14 when the core material 30 is stored in the jacket material 14. Be placed.

  Then, the inside of the jacket material 14 is evacuated and decompressed by a decompression pump or the like, and the jacket material 14 is sealed by heat welding or the like while maintaining the reduced pressure state. Thereby, the flat vacuum heat insulating material 10 in which the concave grooves 20 and 22 are not formed is obtained.

  Next, the vacuum heat insulating material 10 sealed in a state where the inside is decompressed is compressed from the outer surface of the jacket material 14 by a pressing device (not shown), so that one first sheet of the pair of first sheet bodies 32 and 33 is formed. The grooves 20 and 22 are formed in the body 32 to obtain the vacuum heat insulating material 10. In addition to the compression by a press apparatus, the concave grooves 20 and 22 may manufacture the vacuum heat insulating material 10 provided with the concave grooves 20 and 22 by compressing the core material 30 with a pressing roller, for example.

  In the vacuum heat insulating material 10 according to the present embodiment as described above, the pair of first sheet bodies 32 and 33 arranged to face the jacket material 14 is a fiber assembly having a predetermined volume compared to the second sheet body 34. Since the weight ratio of the foreign matter contained in is small, damage to the jacket material 14 due to the foreign matter can be suppressed, and heat insulation performance can be maintained by maintaining the vacuum state inside the jacket material 14 for a long period of time.

  Moreover, since the glass fiber which has not performed the process which removes a foreign material can be used for the 2nd sheet | seat body 34 distribute | arranged between a pair of 1st sheet | seat bodies 32 and 33, it can manufacture cheaply. .

  Further, in the first sheet bodies 32 and 33, the fibers are dispersed in the step of removing the foreign matter, the surface thereof becomes smooth, and the surface of the jacket material 14 constituting the outer surface of the vacuum heat insulating material 10 becomes smooth. Therefore, the wettability of the outer surface of the vacuum heat insulating material 10 is increased, and the adhesive strength of the vacuum heat insulating material 10 can be increased.

  In addition, in the vacuum heat insulating material 10 of the present embodiment, the thickness T1 of one first sheet body 32 of the pair of first sheet bodies 32 and 33 disposed to face the outer cover material 14 is the other first sheet. The body 33 is thicker than the thickness T2. Since the surface of one first sheet body 32 provided with a wall thickness is less affected by the surface state of the second sheet body 34 and becomes a smoother surface than the surface of the other first sheet body 33, The vacuum heat insulating material 10 can be firmly bonded and fixed.

  Moreover, in the vacuum heat insulating material 10 of this embodiment, since the recessed grooves 20 and 22 are provided in the one 1st sheet body 32 provided in thickness, it is the 1st in the bottom part of the recessed groove 20 and the recessed groove 22. It is possible to secure the thickness of the sheet body 32 and suppress damage to the jacket material 14.

(Second Embodiment)
Next, a second embodiment will be described with reference to FIG. In addition, the same code | symbol is attached | subjected about the thing of the same structure as 1st Embodiment, and description of the structure is abbreviate | omitted.

  In the vacuum heat insulating material 110 of this embodiment, a part of one first sheet body 132 is thinned out, and concave grooves 20 and 22 that are recessed in the thickness direction of the core material 30 are provided.

  Specifically, as shown in FIG. 5, one first sheet body 132 of the first sheet bodies 132 and 33 constituting the core member 30 of the vacuum heat insulating material 110 is the entire one surface of the second sheet body 34. And a plurality of land portions 132b protruding from the base portion 132a, and the grooves 20 and 22 are defined between the plurality of land portions 132b.

  In the vacuum heat insulating material 110 of the present embodiment, one of the first sheet bodies 132 is thinned out at the positions of the concave grooves 20 and 22, and therefore the vacuum heat insulating material 10 necessary for forming the concave grooves 20 and 22 is provided. The pressure to compress can be suppressed, and damage to the jacket material 14 can be suppressed.

(Other embodiments)
As mentioned above, although embodiment of this invention was described, these embodiment was shown as an example and is not intending limiting the range of invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and modifications thereof are included in the invention described in the claims and equivalents thereof as well as included in the scope and gist of the invention.

DESCRIPTION OF SYMBOLS 1 ... Refrigerator main body, 2 ... Outer box, 3 ... Inner box, 4 ... Heat insulation space, 5 ... Foam heat insulation material, 10 ... Vacuum heat insulation material, 14 ... Cover material, 20 ... Concave groove, 22 ... Concave groove, 30 ... Core material 32... First sheet body 33. First sheet body 34. Second sheet body P P. Radiating pipe

Claims (5)

In a vacuum heat insulating material provided with a core material and a jacket material that stores the core material and holds the inside in a reduced pressure state,
The core material is a pair of first sheet bodies made of a fiber assembly and disposed opposite to the jacket material, and a second sheet body made of a fiber assembly and disposed between the first sheet bodies. The first sheet body is a vacuum heat insulating material in which the weight ratio of the foreign matter contained in the fiber assembly having a predetermined volume is smaller than that of the second sheet body.   A pair of said 1st sheet | seat bodies are vacuum heat insulating materials of Claim 1 from which thickness differs.   The one of a pair of said 1st sheet | seat body is provided with the ditch | groove recessed in the thickness direction from the contact surface with the said jacket material, and thickness is thick compared with the said other 1st sheet | seat body. Vacuum insulation material. In the refrigerator in which a vacuum heat insulating material is disposed between the outer box and the inner box,
The vacuum heat insulating material includes a core material, and a jacket material that stores the core material and holds the inside in a reduced pressure state,
The core material is a pair of first sheet bodies made of a fiber assembly and disposed opposite to the jacket material, and a second sheet body made of a fiber assembly and disposed between the first sheet bodies. The first sheet body is a refrigerator in which the weight ratio of foreign substances contained in a fiber assembly having a predetermined volume is smaller than that of the second sheet body. The vacuum heat insulating material is bonded and fixed to the outer box,
The refrigerator according to claim 4, wherein one of the first sheet bodies facing the outer box is thicker than the other first sheet body.

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