KR101495127B1 - Vacuum heat insulation member and refrigerator using same - Google Patents

Abstract

An object of the present invention is to provide a vacuum heat insulator and a refrigerator having the vacuum insulator which can secure the heat insulating performance over a long term by reducing the load on the core material and the sheath material.
A vacuum insulator comprising a core material and a sheathing material containing the core material and decompressing the inner material, wherein the core material comprises a cutout portion provided on the first material, a second material superimposed on the first material, Is curved toward the cutout portion so as to form a concave portion.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a vacuum insulator and a refrigerator using the vacuum insulator.

The present invention relates to a vacuum insulator and a refrigerator using the vacuum insulator.

BACKGROUND ART [0002] Japanese Patent Application Laid-Open No. 2008-64323 (Patent Document 1) is known as a background art in this technical field. Patent document 1 discloses a heat exchanger comprising a heat insulating casing in which a foamed heat insulating material is filled between an outer case and an inner case, a heat radiating pipe arranged on an inner surface side of the outer case and a core material, Wherein the vacuum thermal insulation panel is formed so as to be opposed to the groove portion on the back surface of the surface on which the groove portion is formed and has a wider convex portion perpendicular to the longitudinal direction than the groove portion Configuration is described.

Japanese Patent Application Laid-Open No. 2008-64323

However, in Patent Document 1, a vacuum insulator is formed, and then a mold is pressed to form a groove in the vacuum insulator. Then, the inorganic fibers of the core material in the processed portion are cut off in the performance of the vacuum insulator. As a result, the heat insulating performance deteriorates. In addition, there has been a problem that the heat insulating performance is deteriorated because the sheath material is stretched by press working to cause cracking and lowering of gas barrier property.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a vacuum insulator and a refrigerator having the vacuum insulator which can secure the heat insulating performance over a long period of time by reducing the load on the core or the sheath material.

In order to solve the above-described problems, for example, the configuration described in claims is adopted. The present invention includes a plurality of means for solving the above-mentioned problems. For example, in the case of a vacuum insulation material having a core material and a sheathing material containing the core material and decompressing the inner material,
Wherein the core material has a cutout in a first material, a second material is superimposed on the first material, and the second material is curved toward the cutout so as to form a recess. do.

It is possible to provide a vacuum heat insulating material capable of securing the heat insulating performance over a long term by reducing the load on the core material or the sheath material and a refrigerator having the same.

1 is a front view of a refrigerator according to an embodiment of the present invention;
2 is a sectional view taken along the line AA of Fig.
3 is a schematic sectional view of a vacuum insulator used in the present invention.
Fig. 4 is an explanatory view of a core constitution of a vacuum insulator showing Embodiment 1 of the present invention. Fig.
Fig. 5 is an explanatory view of the core constitution of a vacuum insulator showing Embodiment 2 of the present invention. Fig.
6 is an explanatory view of a vacuum insulator outer case installation showing a third embodiment of the present invention.
7 is a chart showing the evaluation results of the core material according to the respective embodiments of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to Figs. 1 and 2. Fig. Fig. 1 is a front view of a refrigerator showing the present embodiment, and Fig. 2 is a sectional view taken along the line A-A in Fig.

As shown in Fig. 2, the refrigerator 1 of the present embodiment has a refrigerating chamber 2 at an upper portion and a vegetable chamber 5 at a lower portion thereof. Between the refrigerating compartment 2 and the vegetable compartment 5, a lower freezing compartment 4 is provided. An ice making chamber 3a and an upper freezing chamber 3b are provided side by side between the lower freezing chamber 4 and the refrigerating chamber 2. [

As shown in Fig. 1, doors for opening and closing the front openings are provided in the respective storage rooms. The refrigerator compartment 2 is provided with rotary refrigerator compartment doors 6a and 6b rotating around a hinge 10 or the like.

The freezing chamber door 7a, the upper freezing chamber door 7b, the lower freezing chamber door 8, and the greenhouse chamber 7 are respectively connected to the ice making chamber 3a, the upper freezing chamber 3b, the lower freezing chamber 4, The door 9 is disposed. When these draw-out doors are taken out, the storage containers housed in the respective storage rooms are taken out together.

Each door is provided with a seal member 11 for airtightly adhering to the body of the refrigerator 1 and attached to the outer periphery of the opening on the storage chamber side of each door. A heat insulating partition 12 is disposed for partitioning the refrigerating compartment 2 and the freezing compartment 3a and the upper freezing compartment 3b. The heat insulating partition 12 is a heat insulating wall having a thickness of about 30 to 50 mm and is provided by using a single type of styrofoam, a foam insulating material (rigid urethane foam), a vacuum insulating material, or a combination of a plurality of heat insulating materials. Similarly, between the lower freezing chamber 4 and the vegetable compartment 5, a heat insulating partition 14 for partitioning is provided.

Since the temperature zone is the same, there is provided a partitioning member 13 that forms the supporting surface of the sealing member 11, not the partitioning wall for partitioning the ice making chamber 3a, the upper freezing chamber 3b and the lower freezing chamber 4 .

Basically, an insulation partition is installed in a compartment of a compartment where the storage temperature of refrigeration, freezing, etc. is different. In the casing 20, the refrigerating compartment 2, the ice making compartment 3a, the upper freezing compartment 3b, the lower freezing compartment 4 and the storage compartment of the vegetable compartment 5 are formed separately from the top. However, Is not particularly limited to this. The refrigerating chamber doors 6a and 6b, the ice making chamber door 7a, the upper freezing chamber door 7b, the lower freezing chamber door 8 and the vegetable chamber door 9 are also opened and closed by rotation, And the number of divisions of the number of divisions.

The casing 20 is provided with an outer case 21 and an inner case 22 and is provided with a heat insulating portion in a space formed by the outer case 21 and the inner case 22, The outside is insulated. A vacuum insulating material is disposed in the space between the outer case 21 and the inner case 22 and a space other than the vacuum insulating material is filled with a foamed heat insulating material 23 such as a hard urethane foam. The vacuum insulator 50 will be described later.

A cooler 28 is provided on the back side of the ice making chamber 3a, the upper freezing chamber 3b and the lower freezing chamber 4 (freezing temperature versus room) in order to cool the respective storage chambers of the refrigerator 1 to a predetermined temperature. . The cooler 28 constitutes a refrigeration cycle by connecting a compressor 30, a condenser 31, and a capillary tube (not shown). A blower 27 for circulating cold air cooled by the cooler 28 into the refrigerator 1 and maintaining a predetermined low temperature is disposed above the cooler 28.

The heat insulating partition walls 12 and 14 partitioning the refrigerating chamber 2 of the refrigerator 1 and the ice making chamber 3a and the upper freezing chamber 3b and the lower freezing chamber 4 and the vegetable compartment 5 are made of foamed polystyrene 33 And a vacuum insulator 50c. The heat insulating partition 12, 14 may be filled with a foamed heat insulator such as a hard urethane foam, and is not particularly limited to the foamed polystyrene 33 and the vacuum heat insulator 50c.

A concave portion 40 for accommodating an electric component 41 such as a board or a power supply board for controlling the operation of the refrigerator 1 is formed in the rear portion of the upper surface of the casing 20. Further, a cover 42 for covering the electric component 41 is provided. The height of the cover 42 is arranged to be substantially the same height as the upper surface 21a of the outer case 21 in consideration of the appearance design and the internal volume. It is preferable that the height of the cover 42 is within 10 mm when the height of the cover 42 protrudes from the upper surface 21a of the outer case 21. [

The concave portion 40 is disposed in the concave state as much as the space for accommodating the electric component 41 on the side of the foamed heat insulating material 23 so that the content is inevitably sacrificed in order to secure the heat insulating thickness. The thickness of the foamed heat insulating material 23 between the concave portion 40 and the inner case 22 is reduced. Therefore, the vacuum heat insulating material 50a is disposed in the foamed heat insulating material 23 of the concave portion 40 so as to secure the heat insulating performance. In this embodiment, the vacuum heat insulator 50a is formed as one piece of the vacuum heat insulator 50a which is formed in a substantially Z shape so as to extend over the lower part of the electric component 41. [ On the other hand, the cover 42 is made of a steel sheet in consideration of heat resistance.

The compressor (30) and the condenser (31) disposed at the lower portion of the rear surface of the casing (20) are parts with large heat generation. Therefore, the vacuum insulator 50d is disposed on the projection surface of the inner case 22 in order to prevent the intrusion of heat into the cabinet. The vacuum insulation material 50b and the like are also disposed on the side surface 21e and the back surface 21b to improve the heat insulating property of the casing 20. [

Next, the vacuum insulator 50 of the present embodiment will be described with reference to Fig. 3. The vacuum insulator 50 includes a core 51 and an inclusion material 52 for holding the core 51 in a compressed state and a core 51 held in a compressed state by the inclusion 52 A shell material 53 having a gas barrier layer, and an adsorbent (not shown).

The outer covering material 53 is disposed outside the vacuum insulating material 50 and has a cylindrical shape in which a portion of a certain width from the ridgeline of a laminate film of the same size is bonded by heat welding. On the other hand, in the present embodiment, the core member 51 is made of a laminate of inorganic fibers having flexibility which is not adhered or bonded with a binder or the like, and a glass wool having an average fiber diameter of 4 탆 is used. With respect to the core material 51, it is advantageous in terms of adiabatic performance because the outgas is reduced by using a laminate of an inorganic fiber material. However, the core material 51 is not particularly limited to this, and examples thereof include ceramic fibers, rock wool, Or inorganic fibers such as glass fibers other than glass wool. Depending on the kind of the core material 51, the encapsulating material 52 may be unnecessary.

As the core material 51, an organic resin fiber material may be used in addition to the inorganic fiber material. In the case of the organic resin fiber, it is not particularly limited in use if it satisfies the heat resistance temperature and the like. Specifically, polystyrene, polyethylene terephthalate, polypropylene, or the like is generally fiberized to have a fiber diameter of about 1 to 30 mu m by a meltblowing method or a spunbond method. However, in the case of an organic resin or a fibrous method capable of forming a fiber, No problem.

The laminate structure of the sheath material 53 is not particularly limited as long as it has gas barrier properties and can be heat-welded. In this embodiment, the laminate structure of the sheath material 53 has a three-layer structure of a surface protective layer, As a laminate film. The surface protective layer is a resin film having a role as a protective material.

The gas barrier layer has a layer in which a metal vapor deposition layer is provided on a resin film and a layer in which a metal vapor deposition layer is provided on a resin film having high oxygen barrier property and is bonded so that the metal vapor deposition layers are opposed to each other.

Like the surface layer, the thermal welding layer uses a film having low hygroscopicity.

Specifically, as the surface protective layer, biaxial stretching type films such as polypropylene, polyamide, and polyethylene terephthalate are used.

As the gas barrier layer, a biaxially oriented polyethylene terephthalate film with aluminum vapor deposition, a biaxially oriented ethylene vinyl alcohol copolymer resin film with aluminum vapor deposition or a biaxially oriented polyvinyl alcohol resin film with aluminum vapor deposition or an aluminum foil use.

As the thermal welding layer, non-stretch type polyethylene, polypropylene, and other films are used.

The layer structure and materials of the three-layer laminate film are not particularly limited to these. For example, the gas barrier layer may be a metal foil or a resin film in which an inorganic layered compound, a resin-based gas barrier coating material such as polyacrylic acid, or a gas barrier film made of DLC (diamond like carbon) A polybutylene terephthalate film having high properties may be used.

Although the surface protection layer is a protective material for the gas barrier layer, it is preferable to arrange a resin with low hygroscopicity, in order to improve the vacuum evacuation efficiency in the manufacturing process of the vacuum insulator 50. [

Further, the resin film other than the metal foil used for the gas barrier layer is remarkably deteriorated in gas barrier property by moisture absorption. Therefore, a resin having low hygroscopicity is also arranged for the thermal welding layer. This suppresses the deterioration of the gas barrier property and suppresses the moisture absorption amount of the entire laminate film. Further, even in the vacuum exhaust process of the vacuum insulator 50, since the moisture content of the encapsulant 53 can be reduced, the vacuum exhaust efficiency is greatly improved, leading to a high performance of the heat insulation performance.

On the other hand, the lamination (adhesion) of each film is generally carried out by a dry lamination method through a two-liquid curing type urethane adhesive. However, the type and the bonding method of the adhesive are not particularly limited to this, and wet lamination, thermal lamination Or by other methods such as a method.

The inclusion material 52 is made of a heat-sealable polyethylene film and the adsorbent is a physical adsorption type synthetic zeolite.

However, the present invention is not limited to these materials, and the inclusion material 52 may be a polypropylene film, a polyethylene terephthalate film, a polybutylene terephthalate film, etc., , Adsorbing moisture or gas to the adsorbent, and either physical adsorption or chemical reaction adsorption.

(Example 1)

Next, a first embodiment of the present invention will be described with reference to Fig.

Fig. 4 is an explanatory diagram of a core constitution of a vacuum insulator showing Embodiment 1. Fig. The core material of the vacuum insulator 50 is provided with a cutout portion 51c in the first material 51b. The second material 51a having a density lower than that of the first material 51b and having a large deformation rate in the thickness direction is overlaid on the first material 51b so that the second material 51a forms the concave portion 54 And curved toward the cutout portion 51c.

The second material 51a is a low-density material having large deformation in the thickness direction, and is made of a glass wool fiber aggregate which is inorganic fibers.

The first material 51b is a dense material having a small deformation in the thickness direction, and uses a polystyrene fiber aggregate that is organic fiber.

The first material 51b and the second material 51a are combined and vacuum packaged with the encapsulating material 52 and the sheathing material 53 so that the inside becomes negative pressure so that the core 51 receives pressure uniformly from the outside. At this time, the first material 51b is provided with the cutout portion 51c, so that the second material 51a having a density lower than that of the first material 51b is pressed so that the shape of the cutout portion 51c do. On the other hand, by making the first material 51b smaller than the second material 51a, one end or both ends of the second material 51a may be curved to form a recess.

In addition, the maximum depth of the cutout portion is made substantially equal to the thickness of the first material 51b after compression and deformation. In this case, the portion curved to form the concave portion 54 of the second material 51a is substantially flush with one side of the first material 51b, Can be suppressed.

Next, the examination results of the first material 51b and the second material 51a, i.e., the high-density material and the low-density material in this embodiment are shown in Fig.

7, in No. 1, a high-density material was an ABS resin plate having a density of 1050 kg / m 3, and a low density material was a glass wool fiber aggregate having a density of 11.5 kg / m 3.

In No. 2, a high-density material was a polystyrene fiber aggregate having a density of 88 kg / m 3, and a low-density material was a glass wool fiber aggregate having a density of 11.5 kg / m 3.

In No. 3, a high-density material was a polystyrene fiber aggregate having a density of 44 kg / m 3, and a low-density material was a glass wool fiber aggregate having a density of 11.5 kg / m 3.

In No. 4, a foamed urethane in which a high density material was connected (communicated) at a density of 25 kg / m 3, and a low density material was made of a glass wool fiber aggregate having a density of 11.5 kg / m 3.

In No. 5, a high-density material was made of a polystyrene fiber aggregate having a density of 44 kg / m 3 and a low-density material was pressed into a press-compressed glass wool fiber aggregate having a density of 23 kg / m 3.

In No. 6, a high-density material was a polystyrene fiber aggregate having a density of 16 kg / m 3, and a low-density material was a glass wool fiber aggregate having a density of 11.5 kg / m 3.

In No. 7, a high-density material and a low-density material were made into a glass wool fiber aggregate having a density of 11.5 kg / m 3.

As a result of these studies, it is possible to form a concave shape even if the density ratio of the low-density material to the high-density material is 1% as in No. 1. [ However, when the density of the high-density material is high, the heat transfer becomes high when the vacuum insulator is used, and the thermal conductivity is deteriorated.

On the other hand, if the density ratio of the low-density material to the high-density material is 100% as in No. 7, the concave shape can not be stably formed.

Accordingly, when the density ratio of the low-density material to the high-density material is 13 to 72% (Nos. 2 to 6), the moldability of the concave shape is good and the value of the thermal conductivity is good. In addition, by preferably setting the density ratio of the low density material to 26 to 52% (No.3 to No.5) with respect to the high density material, a vacuum heat insulator having better moldability and thermal conductivity can be obtained.

On the other hand, although a polystyrene fiber aggregate is used as the high-density material of this embodiment, it is also possible to use polyethylene terephthalate, polyethylene, polypropylene, polycarbonate, polyamide, polyvinyl alcohol fiber aggregate, foamed urethane, polystyrene and the like.

As the low-density material, even a fiber aggregate of the same kind as the fiber aggregate can be formed into a concave shape by using a material having a different density such as a binder or a glass wool sheet.

(Example 2)

Next, a second embodiment will be described with reference to FIG. 5 shows that a part of the first material 51b (polystyrene fiber aggregate) is smaller than the size of the second material 51a (glass wool fiber aggregate). That is, the gap between the second material 51a and the first material 51b, which is superimposed, is provided at a predetermined interval. Alternatively, a cutout portion having substantially the same thickness as the thickness of the first material 51b after compression and deformation is provided on the layer of the second material 51a and the first material 51b superimposed on the second material 51a.

The size of the concave portion 54 of the second material 51a is determined according to the thickness of the first material 51b so that the thickness of the layer of the first material 51b is made small, Can be changed. Accordingly, in the layer of the second material 51a, a small concave portion 54 which is difficult to be formed by spring back can be formed in the press working or the like.

(Example 3)

Next, a third embodiment will be described with reference to Fig. 6 is a sectional view when a vacuum insulator 50 is provided between the outer case 21 and the inner case 22 of the refrigerator. And a vacuum insulator 50 is provided between the outer case 21 and the inner case 22. [ A heat dissipating pipe 60 for dissipating the coolant is disposed between the outer case 21 and the vacuum insulator 50 so as to contact the outer case 21 made of steel. As a result, the heat from the heat radiation pipe 60 is radiated to the outside through the outer case 21 made of a steel sheet, so that the heat can be prevented from being affected by the heat.

Further, the heat-radiating pipe (60) is provided in the recess (54).

Accordingly, the heat-radiating pipe 60 can be disposed in the planar outer case 21, and the vacuum insulator 50 can be provided to cover the heat-radiating pipe 60. Further, the vacuum insulator 50 can be provided from above the heat-radiating pipe 60 without performing grooving or the like on the outer case 21. Accordingly, it is possible to provide the refrigerator 1 in which the vacuum insulator 50 can be arranged at a large outer diameter along the outer case 21, thereby increasing the coverage by the vacuum insulator 50 and improving the heat insulating performance with little leakage of heat .

As described above, according to the embodiment of the present invention, a core material is provided with a cut-out portion in a first material, and a second material having a density lower than that of the first material and having a large deformation rate in the thickness direction is superposed on the first material, Is curved toward the cutout portion to form a concave portion. That is, the second material having a large deformation in the thickness direction becomes a shape along the cut-out portion of the first material due to the pressure from the outside air when vacuum-packed, so that the concave portion can be provided.

Accordingly, there is no need to perform press working after forming the vacuum insulator. Therefore, it is possible to prevent the deterioration of the heat insulating performance, such as the cutting of the inorganic fibers of the core material, the cracking of the casing material by press working, and the degradation of gas barrier properties. In addition, by using the vacuum heat insulator whose heat insulating performance is maintained for a long time, the energy saving of the refrigerator can be improved.

1 - Refrigerator
20 - casing
21 - outer case
22 - Inner case
23 - foam insulation
40, 54 - concave portion
50, 50a, 50b, 50c, 50d - Vacuum insulation
51 - Core
51a - Second material (glass wool fiber aggregate)
51b-First material (polystyrene fiber aggregate)
51c - cutout portion
52 - Nesting material
53 -
60 - Heat pipe
61 - Aluminum tape
62 - Foamed urethane

Claims (6)

A vacuum insulator comprising a core material and a sheathing material for containing the core material and decompressing the inside,
Wherein the core material is provided with a cutout in a first material and a second material is superimposed on the first material and the second material is curved toward the cutout side to form a concave portion, 2 < / RTI > material is received in the cutout portion of the first material. The method according to claim 1,
Wherein the second material has a density lower than that of the first material and has a large strain rate in the thickness direction. The method according to claim 1,
Characterized in that a resin fiber aggregate or foamed urethane is used as the first material. 4. The method according to any one of claims 1 to 3,
Wherein the density ratio of the second material to the first material is 13 to 72%. 4. The method according to any one of claims 1 to 3,
And the maximum depth of the cutout portion becomes equal to the thickness of the first material after compression and deformation. A vacuum insulator is provided between the outer case and the inner case,
A refrigerator having a heat-radiating pipe for radiating a refrigerant disposed between an outer case and a vacuum insulation member,
Wherein the vacuum insulator comprises a core material, and a sheathing material for containing the core material and decompressing the inside of the core material,
Wherein the core material is provided with a cutout portion in a first material, and a second material is superposed on the first material, and the second material is curved toward the cutout portion so as to form a concave portion so that at least a part of the second material A second material accommodated in the cutout portion of the first material,
And the heat radiating pipe is located in the recess.

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