Refrigerator, insulated casing for refrigerator and method for manufacturing the same, and composite insulation material for refrigerator and method for manufacturing the same

Abstract

To provide a refrigerator that is less prone to surface defects during foamed polyurethane filling and has excellent heat insulation properties, an insulated box that can be used in the refrigerator and a method for manufacturing the same, and a composite insulation material for refrigerators that can be advantageously used in the refrigerator and insulated box and is less prone to damage to the outer packaging material, and a method for manufacturing the same. [Solution] The refrigerator comprises an insulated box body having a storage compartment inside and an opening at the front, and an insulated door that can open and close the opening. The insulated box body comprises an outer box, an inner box disposed inside the outer box, a composite insulation material disposed between the outer box and the inner box, and a heat dissipation pipe disposed in contact with the inner surface of the outer box. The composite insulation material comprises a vacuum insulation material and a foamed insulation material layer covering the vacuum insulation material, with grooves formed on the outer box side surface of the foamed insulation material layer, and at least a portion of the heat dissipation pipe housed in the grooves, the outer box and the composite insulation material being bonded together with an adhesive, and the space between the inner box and the composite insulation material being filled with rigid foamed urethane material.

Description

[Technical Field]

[0001] The present invention relates to a refrigerator, an insulated casing for a refrigerator and a method for manufacturing the same, and a composite insulation material for a refrigerator and a method for manufacturing the same. [Background technology]

[0002] A refrigerator comprises an insulated box body with a storage compartment inside and an opening at the front, and an insulated door that can open and close the opening. The insulated box body has an outer box and an inner box placed inside the outer box. Generally, an insulating material is placed between the inner box and the outer box, and heat dissipation pipes are placed on the inner surface of the outer box. It has been considered to use vacuum insulating material as the insulating material, to form grooves on the surface of the vacuum insulating material on the outer box side, and to house the heat dissipation pipes in these grooves (see, for example, Patent Documents 1 and 2). [Prior art documents] [Patent Documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2015-7526 [Patent Document 2] Japanese Patent Publication No. 2023-73877 [Overview of the project] [Problems that the invention aims to solve]

[0004] Vacuum insulation materials consist of a core material enclosed in a vacuum within an outer casing, and because they have high thermal insulation properties, they are useful as insulation materials for refrigerators. However, the thermal insulation properties of vacuum insulation materials can decrease if the outer casing is damaged and the degree of vacuum inside decreases. In addition, in refrigerators using vacuum insulation materials, it is common to fill the space between the vacuum insulation material and the inner box with polyurethane foam. However, when filling with polyurethane foam, the foaming pressure of the polyurethane can push the vacuum insulation material towards the outer box, pressing the heat dissipation pipes against the refrigerator's outer box, which can leave marks on the outer box and result in an unsightly appearance. Furthermore, if the inner box has irregularities, gaps may form between the vacuum insulation material and the inner box, causing the inner box to deform.

[0005] This invention has been made in view of the above circumstances, and aims to provide a refrigerator that is less prone to surface defects when foamed urethane is filled and has excellent heat insulation properties, a heat-insulating box that can be used in such a refrigerator and a method for manufacturing the same, and a composite heat-insulating material for refrigerators that contains a vacuum heat-insulating material but in which the outer packaging of the vacuum heat-insulating material is less prone to damage and a method for manufacturing the same. [Means for solving the problem]

[0006] To solve the above problems, the inventors of the present invention have found that it is effective to use a composite insulation material comprising a vacuum insulation material and a foamed insulation material layer covering the vacuum insulation material, wherein grooves for accommodating heat dissipation pipes are formed on one surface of the foamed insulation material layer, and have completed the present invention. Accordingly, the present invention provides the following.

[0007] (1) A refrigerator comprising an insulated box body having a storage compartment formed inside and an opening at the front, and an insulated door that can open and close the opening, wherein the insulated box body comprises an outer box, an inner box disposed inside the outer box, a composite insulation material disposed between the outer box and the inner box, and a heat dissipation pipe disposed in contact with the inner surface of the outer box, wherein the composite insulation material comprises a vacuum insulation material and a foamed insulation material layer covering the vacuum insulation material, grooves are formed on the outer box side surface of the foamed insulation material layer, at least a portion of the heat dissipation pipe is housed in the grooves, the outer box and the composite insulation material are bonded together with an adhesive, and the space between the inner box and the composite insulation material is filled with rigid foamed urethane material.

[0008] According to the refrigerator in (1), the composite insulation material used in the insulated box has a vacuum insulation material, thus providing high insulation performance. Furthermore, the foam insulation layer covering the vacuum insulation material has high cushioning properties, making it less likely for the outer packaging of the vacuum insulation material to be damaged by external impacts. In addition, since at least a portion of the heat dissipation pipes are housed in the grooves of the foam insulation layer, the force pressing the heat dissipation pipes against the outer box is reduced when the foam urethane is filled. As a result, cosmetic defects due to the presence of the heat dissipation pipes are less likely to occur. Moreover, since rigid foam urethane material is filled between the inner box and the composite insulation material, the insulation performance between the outer box and the inner box is improved regardless of the shape of the inner box.

[0009] (2) The refrigerator according to (1), wherein the foamed insulation layer is made of a rigid polyurethane foam material.

[0010] According to refrigerator (2), the foamed insulation layer is made of rigid polyurethane foam, which further improves the thermal insulation performance of the composite insulation material.

[0011] (3) The density of the foamed insulation layer is 30 kg / m³ 3 More than 50kg / m 3 A refrigerator as described in (2) below, within the following range.

[0012] According to the refrigerator in (3), the density of the foamed insulation layer, which is made of rigid polyurethane foam, is within the above range and has high hardness, thus improving the strength of the foamed insulation layer.

[0013] (4) The density of the rigid polyurethane foam material is 30 kg / m³ 3 More than 35kg / m 3 A refrigerator that falls within the following range and is listed in any one of (1) to (3).

[0014] According to the refrigerator in (4), since the density of the rigid polyurethane foam material is within the above range, the thermal insulation between the outer and inner boxes is further improved.

[0015] (5) A refrigerator insulated box comprising an outer box, an inner box disposed inside the outer box, a composite insulation material disposed between the outer box and the inner box, and a heat dissipation pipe disposed in contact with the inner surface of the outer box, wherein the composite insulation material comprises a vacuum insulation material and a foamed insulation material layer covering the vacuum insulation material, grooves are formed on the outer box side surface of the foamed insulation material layer, at least a portion of the heat dissipation pipe is housed in the grooves, the outer box and the composite insulation material are bonded together with an adhesive, and the space between the inner box and the composite insulation material is filled with a rigid foamed urethane material.

[0016] According to the insulated refrigerator box of (5), high thermal insulation is achieved because a composite insulation material with vacuum insulation is used. Furthermore, the foam insulation layer covering the vacuum insulation material has high cushioning properties, so damage to the outer packaging of the vacuum insulation material due to external impact is less likely to occur. In addition, since at least a portion of the heat dissipation pipe is housed in the groove of the foam insulation layer, the force pressing the heat dissipation pipe against the outer box is reduced when foam urethane is filled. As a result, cosmetic defects due to traces of the heat dissipation pipe are less likely to occur. Moreover, since rigid foam urethane material is filled between the inner box and the composite insulation material, the thermal insulation between the outer box and the inner box is improved regardless of the shape of the inner box.

[0017] (6) A step of disposing a heat dissipation pipe on the inner surface of the outer box forming member, and on the inner surface of the outer box forming member, a vacuum heat insulating material and a foamed heat insulating material layer covering the vacuum heat insulating material are provided, and a composite heat insulating material having a groove formed on one surface of the foamed heat insulating material layer is overlapped so that at least a part of the heat dissipation pipe is accommodated in the groove, and the composite heat insulating material and the outer box forming member are adhered with an adhesive; and a step of disposing an inner box on the side opposite to the side where the composite heat insulating material is adhered to the outer box forming member and filling a rigid foamed urethane material between the composite heat insulating material and the inner box. A method for manufacturing a heat insulating box body for a refrigerator, including these steps.

[0018] According to the method for manufacturing a heat insulating box body for a refrigerator in (6), since the vacuum heat insulating material is covered with a foamed heat insulating material layer having high cushioning properties, the outer packaging material of the vacuum heat insulating material is less likely to be damaged during manufacturing. Also, since at least a part of the heat dissipation pipe is accommodated in the groove of the foamed heat insulating material layer, in the step of filling the rigid foamed urethane material, the force pressing the outer box of the heat dissipation pipe is reduced. Therefore, appearance defects due to the trace of the heat dissipation pipe are less likely to occur. For this reason, a heat insulating box body for a refrigerator having high heat insulation performance and less likely to cause appearance defects can be industrially advantageously manufactured.

[0019] (7) A composite heat insulating material for a refrigerator, comprising a vacuum heat insulating material and a foamed heat insulating material layer covering the vacuum heat insulating material, and having a groove formed on at least one surface of the foamed heat insulating material layer.

[0020] According to the composite heat insulating material for a refrigerator in (7), since it has a vacuum heat insulating material, it has high heat insulation performance. Also, since the foamed heat insulating material layer covering the vacuum heat insulating material has high cushioning properties, damage to the outer packaging material of the vacuum heat insulating material due to an external impact is less likely to occur. Further, when a heat dissipation pipe is accommodated in the groove, expansion and contraction of the heat dissipation pipe can be absorbed by the foamed heat insulating material layer.

[0021] Prepare a molding die having (8) a first die and a second die disposed opposite to the first die, and having convex portions formed on the surface of at least one of the first die and the second die. Then, dispose a vacuum heat insulating material between the first die and the second die, and then inject a foaming material between the vacuum heat insulating material and the first die and between the vacuum heat insulating material and the second die, and foam the foaming material to coat the vacuum heat insulating material with a foamed heat insulating material layer. A method for manufacturing a composite heat insulating material for a refrigerator, including the steps of

[0022] According to the method for manufacturing a composite heat insulating material for a refrigerator of (8), since convex portions are formed on the surface of at least one of the first die and the second die, the vacuum heat insulating material is coated with a foamed heat insulating material layer and grooves are formed in the foamed heat insulating material layer. Therefore, compared with the case where grooves are directly formed in the vacuum heat insulating material, the outer wrapping material of the vacuum heat insulating material is less likely to be damaged during manufacturing. Thus, a composite heat insulating material having high heat insulation performance and being easy to accommodate a heat dissipation pipe can be industrially advantageously manufactured.

Effects of the Invention

[0023] According to the present invention, it is possible to provide a refrigerator in which appearance defects are less likely to occur during filling of foamed urethane and which has excellent heat insulation performance, a heat insulating box body that can be used in the refrigerator and a manufacturing method thereof, and a composite heat insulating material for a refrigerator that includes a vacuum heat insulating material but is less likely to have its outer wrapping material damaged, and a manufacturing method thereof.

Brief Description of the Drawings

[0024] [Figure 1] It is a perspective view showing a refrigerator according to an embodiment of the present invention. [Figure 2] It is a sectional view taken along line II-II of FIG. 1. [Figure 3] It is a perspective view showing a heat insulating box body of a refrigerator according to an embodiment of the present invention. [Figure 4] It is a sectional view taken along line IV-IV of FIG. 3. [Figure 5] It is a perspective view showing a vacuum heat insulating material used in a composite heat insulating material for a refrigerator according to an embodiment of the present invention. [Figure 6]This is a cross-sectional view showing the process of forming a foamed insulation layer on a vacuum insulation material. [Figure 7] This is a perspective view showing a vacuum insulation material covered with a foamed insulation layer. [Figure 8] This is a perspective view showing an outer casing forming member used in a method for manufacturing a refrigerator according to one embodiment of the present invention. [Figure 9] This is a perspective view showing the heat dissipation pipes arranged on the outer casing forming member. [Figure 10] This is a perspective view showing the composite insulation material placed on the outer box forming member. [Modes for carrying out the invention]

[0025] Embodiments of the present invention will be described below with reference to the attached drawings. In the following description, the vertical direction indicates the height direction of the refrigerator 1, the left-right direction indicates the width direction of the refrigerator 1, and the front-back direction indicates the depth direction of the refrigerator 1.

[0026] Figure 1 is a perspective view showing a refrigerator according to one embodiment of the present invention. Figure 2 is a cross-sectional view taken along line II-II of Figure 1. Figure 3 is a perspective view showing the insulated casing of a refrigerator according to one embodiment of the present invention, and Figure 4 is a cross-sectional view taken along line IV-IV of Figure 3.

[0027] The refrigerator 1 comprises an insulated box body 10 having a storage compartment 2 formed inside and an opening at the front, and an insulated door 20 that can open and close the opening of the insulated box body 10. The storage compartment 2 is divided into two levels, an upper storage compartment 2a and a lower storage compartment 2b, by an insulated partition wall 3. For example, the upper storage compartment 2a may be used as the refrigerator and the lower storage compartment 2b as the freezer. The upper storage compartment 2a is closed by the upper insulated door 20a, and the lower storage compartment 2b is closed by the lower insulated door 20b.

[0028] The insulated box 10 comprises an outer box 11, an inner box 12 positioned inside the outer box 11, a composite insulation material 13 positioned between the outer box 11 and the inner box 12, and a heat dissipation pipe 19 positioned in contact with the inner surface of the outer box. The insulated box 10 has a right side portion 10a, a left side portion 10b, a top portion 10c, a rear portion 10d, and a bottom portion 10e. The heat dissipation pipe 19 is positioned in contact with the inner surfaces of the outer box 11 on the right side portion 10a, the left side portion 10b, and the top portion 10c.

[0029] The outer casing 11 is made of a highly thermally conductive material. For example, metal materials such as iron or stainless steel can be used as the highly thermally conductive material.

[0030] The inner box 12 is made of a low thermal conductivity material. As the low thermal conductivity material, a resin material such as ABS can be used.

[0031] The composite insulation material 13 comprises a vacuum insulation material 131 and a foamed insulation material layer 132 covering the vacuum insulation material 131. A groove 133 is formed on the surface of the foamed insulation material layer 132a on the outer box 11 side. A heat dissipation pipe 19 is housed in the groove 133.

[0032] The vacuum insulation material 131 can be one in which a core material is enclosed in a vacuum within an outer packaging material. Since the vacuum insulation material 131 is covered with a foamed insulation material layer 132, the outer packaging material may have thermal conductivity. As the outer packaging material, for example, an aluminum laminate film bag can be used. As the core material, for example, glass wool, silica powder, or aerogel powder can be used. There are no particular restrictions on the thickness of the vacuum insulation material 131, but it may be in the range of 3 mm to 30 mm.

[0033] The foamed insulation layer 132 may be a foamed urethane layer, a foamed styrene layer, a foamed ethylene layer, or a foamed phenol layer. Preferably, the foamed insulation layer 132 is a rigid foamed urethane layer. The density of the rigid foamed urethane layer is, for example, 30 kg / m³. 3 More than 50kg / m 3 It may be within the following range, or 40 kg / m 3Above 50 kg / m 3 It may also be within the following range. The thickness of the foam heat insulating material layer 132 is not particularly limited, and may be, for example, within the range of 1 mm or more and 50 mm or less. The thickness of the foam heat insulating material layer 132 may be within the range of, for example, 0.5 times or more and 2.0 times or less with respect to the thickness of the vacuum heat insulating material 131.

[0034] The heat radiation pipe 19 is composed of a pipe 191 and a refrigerant 192 flowing inside the pipe 191. At least a part of the heat radiation pipe 19 contacts the inner surface of the outer box 11, thereby releasing the heat inside the refrigerator to the outside through the outer box 11.

[0035] The heat radiation pipe 19 and the composite heat insulating material 13 are adhered to the outer box 11 by an adhesive 15. As the adhesive 15, for example, a hot melt adhesive such as ethylene vinyl acetate (EVA) can be used.

[0036] The space between the inner box 12 and the composite heat insulating material 13 is filled with a rigid foam urethane material 17. The density of the rigid foam urethane material 17 is, for example, 30 kg / m 3 Above 35 kg / m 3 It may also be within the following range. The density of the rigid foam urethane material 17 may be lower than the density of the foam heat insulating material layer 132b on the inner box 12 side of the composite heat insulating material 13. The density of the rigid foam urethane material 17 may be within the range of, for example, 0.5 times or more and 0.8 times or less with respect to the density of the foam heat insulating material layer 132b on the inner box 12 side of the composite heat insulating material 13.

[0037] As shown in FIG. 2, a machine room 31 is provided at the lower rear of the lower storage chamber 2b of the refrigerator 1. A compressor 32 is housed in the machine room 31. A cooling chamber 33 is partitioned above the machine room 31, and an evaporator 34 is housed in the cooling chamber 33. The evaporator 34 and the compressor 32 are connected to an expansion means and a condenser (not shown) to form a vapor compression refrigeration cycle. Each component device constituting the vapor compression refrigeration cycle is connected to each other through the heat radiation pipe 19. The cooling chamber 33 takes in the air inside the lower storage chamber 2b and cools the taken-in air with the evaporator 34.

[0038] A blower 35 is located at the top of the cooling chamber 33. The blower 35 blows the air cooled by the evaporator 34 (cold air) to the upper storage chamber 2a and the lower storage chamber 2b via the cold air space path 36. A damper (not shown) is located in the cold air space path 36. The control device (not shown) of the refrigerator 1 controls the opening and closing of the damper based on the internal temperature measured by the internal temperature sensor (not shown). This adjusts the flow rate of cold air and maintains a constant internal temperature. The arrows in Figure 2 indicate the flow of cold air. The cold air that has cooled the upper storage chamber 2a is sent to the cooling chamber 33 via the cold air piping (not shown). Below the evaporator 34, a defrost heater 37 is located to melt frost on the evaporator 34.

[0039] In this embodiment of the refrigerator 1, which has the above configuration, the composite insulation material 13 used in the insulated box 10 has a vacuum insulation material 131, thus providing high insulation performance. Furthermore, the foamed insulation layer 132 covering the vacuum insulation material 131 has high cushioning properties, making it difficult for the outer packaging of the vacuum insulation material 131 to be damaged by external impacts. In addition, since at least a portion of the heat dissipation pipe 19 is housed in the groove of the foamed insulation layer 132, the force pressing the heat dissipation pipe against the outer box is reduced when the foamed urethane is filled. As a result, cosmetic defects due to traces of the heat dissipation pipe are less likely to occur. Moreover, since rigid foamed urethane material 17 is filled between the inner box 12 and the composite insulation material 13, the insulation performance between the outer box 11 and the inner box 12 is improved regardless of the shape of the inner box 12.

[0040] In the refrigerator 1 of this embodiment, if the foamed insulation layer 132 is a rigid polyurethane foam layer, the thermal insulation performance of the composite insulation material 13 is further improved. If the density of the rigid polyurethane foam layer, which is the foamed insulation layer 132, is within the above range, the hardness is high, and the strength of the foamed insulation layer 132 is improved. Therefore, damage to the outer packaging of the vacuum insulation material 131 due to external impact is less likely to occur.

[0041] In the refrigerator 1 of this embodiment, if the density of the rigid polyurethane foam material 17 is within the above range, the thermal insulation between the outer box 11 and the inner box 12 is further improved.

[0042] The manufacturing method of the composite insulation material 13 will be explained using Figures 5 to 7. Figure 5 is a perspective view showing a vacuum insulation material used in a composite insulation material for a refrigerator according to one embodiment of the present invention. Figure 6 is a cross-sectional view showing the process of forming a foamed insulation layer on the vacuum insulation material. Figure 7 is a perspective view showing the vacuum insulation material covered with a foamed insulation layer.

[0043] The composite insulation material 13 used in refrigerator 1 can be manufactured by first preparing a plate-shaped vacuum insulation material 131, as shown in Figure 5, and then forming a foamed insulation material layer on the surface of this vacuum insulation material 131. The foamed insulation material layer can be formed, for example, by a method that includes a preparation step of preparing a predetermined molding die and a coating step of covering the vacuum insulation material with the foamed insulation material layer using the molding die.

[0044] As shown in Figure 6, the molding die 100 prepared in the preparation step has a first die 101 and a second die 102 positioned opposite the first die. A protrusion 103 is formed on the surface of the first die 101 facing the second die 102. The protrusion 103 has a shape that corresponds to a groove 133 formed on the surface of the foamed insulation layer 132a of the composite insulation material 13.

[0045] In the coating process, as shown in Figure 6, the vacuum insulation material 131 is placed between the first mold 101 and the second mold 102. The vacuum insulation material 131 is supported by a support base 104 placed on the second mold 102. Foaming material 135 is injected between the vacuum insulation material 131 and the first mold 101 and between the vacuum insulation material 131 and the second mold 102. A foamed insulation layer is formed by foaming the foaming material 135. The first mold 101 and the second mold 102 have exhaust gas holes (not shown) for releasing the foaming gas generated from the foaming material 135 to the outside. Grooves are formed in the foamed insulation layer formed on the first mold 101 side by protrusions 103.

[0046] The foaming material 135 is a material that forms a foamed insulation layer by foaming. For example, when forming a foamed urethane layer as the foamed insulation layer 132, a liquid composition containing a polyisocyanate compound, a polyol, and a foaming agent can be used as the foaming material 135.

[0047] As shown in Figure 7, the composite insulation material 13 manufactured in the manner described above comprises a vacuum insulation material 131 and a foamed insulation material layer 132 covering the vacuum insulation material 131. Grooves 133 are formed in the foamed insulation material layer 132a formed by the first mold 101 by the protrusions 103.

[0048] According to the manufacturing method of the composite insulation material 13 of this embodiment, which has the above configuration, since the protrusions 103 are formed on the surface of the first mold 101, the vacuum insulation material 131 is covered with a foamed insulation material layer and grooves are formed in the foamed insulation material layer. For this reason, compared to the case in which grooves are formed directly in the vacuum insulation material, the outer packaging material of the vacuum insulation material 131 is less likely to be damaged during manufacturing. Thus, a composite insulation material 13 with high heat insulation properties and easy to accommodate heat dissipation pipes can be manufactured industrially advantageously.

[0049] However, the method for manufacturing the composite insulation material 13 is not limited to the method described above. For example, a flat foamed insulation material layer without grooves may be formed on the surface of the composite insulation material 13, and then grooves may be formed in the formed foamed insulation material layer.

[0050] The manufacturing method of the insulated box 10 of the refrigerator 1 of this embodiment will be explained with reference to Figures 8 and 9. Figure 8 is a perspective view showing an outer casing forming member used in a refrigerator manufacturing method according to one embodiment of the present invention. Figure 9 is a perspective view showing a state in which heat dissipation pipes are arranged on the outer casing forming member, and Figure 10 is a perspective view showing a state in which grooves are formed in the foamed insulation layer.

[0051] The insulated box 10 can be manufactured, for example, as follows.

[0052] First, the outer box forming member is prepared. As shown in Figure 8, the outer box forming member 110 is a plate-like body bent into a U-shape. The outer box forming member 110 forms the right side portion 10a, the left side portion 10b, and the top portion 10c.

[0053] Next, as shown in Figure 9, the heat dissipation pipe 19 is placed on the inner surface of the outer box forming member 110. The heat dissipation pipe 19 may be fixed to the inner surface of the outer box forming member 110 with adhesive or adhesive tape.

[0054] Next, as shown in Figure 10, the composite insulation material 13 is placed on top of the inner surface of the outer box forming member 110. The composite insulation material 13 is placed on top of the inner surface of the outer box forming member 110 so that the heat dissipation pipes are housed in the grooves 133. The composite insulation material 13 and the outer box forming member 110 are bonded together with adhesive 15.

[0055] Next, the outer box forming member 110 is joined to the outer box forming member 110, the outer box rear panel which forms the rear surface portion 10d of the outer box, and the outer box bottom panel which forms the bottom surface portion of the outer box. The composite insulation material 13 is pre-bonded to the inner surfaces of the outer box rear panel and the outer box bottom panel.

[0056] Next, the inner box 12 is placed inside the outer box 11, and the rigid polyurethane foam raw material liquid is poured between the inner box 12 and the composite insulation material 13, causing the rigid polyurethane foam raw material liquid to react and produce the rigid polyurethane foam material 17. In this way, the insulated box body 10 is obtained.

[0057] According to the manufacturing method of the insulated box 10 of this embodiment, which has the above configuration, the vacuum insulation material 131 is covered with a foamed insulation material layer 132 with high cushioning properties, so the outer packaging of the vacuum insulation material 131 is less likely to be damaged during manufacturing. Also, since at least a portion of the heat dissipation pipe 19 is housed in the groove 133 of the foamed insulation material layer, the force with which the heat dissipation pipe 19 presses against the outer box 11 is reduced during the process of filling with rigid foamed urethane material 17. As a result, defects in appearance due to the presence of the heat dissipation pipe 19 are less likely to occur. Therefore, an insulated box 10 with high heat insulation properties and low likelihood of defects in appearance can be manufactured industrially advantageously.

[0058] However, the method for manufacturing the insulated box 10 is not limited to the method described above. For example, the heat dissipation pipe 19 may be housed in the groove 133 of the composite insulation material 13, and the heat dissipation pipe 19 and the composite insulation material 13 may be bonded together to the outer box forming member 110.

[0059] Although embodiments of the present invention have been described in detail above, the present invention is not limited to the embodiments described above. [Explanation of Symbols]

[0060] 1...Refrigerator, 2...Storage room, 3...Insulated partition wall, 10...Insulated box body, 11...Outer box, 12...Inner box, 13...Composite insulation material, 131...Vacuum insulation material, 132, 132a, 132b...Foam insulation layer, 133...Groove, 135...Foam material, 15...Adhesive, 17...Rigid polyurethane foam material, 19...Heat dissipation pipe, 191...Piping, 192...Refrigerant, 20...Insulated door, 31...Machine room, 32...Compressor, 33...Cooling room, 34...Evaporator, 35...Blower, 36...Cold air space path, 37...Defrost heater, 100...Molding die, 101...First die, 102...Second die, 103...Protrusion, 104...Support base, 110...Outer box forming member

Claims

1. It comprises an insulated box body having a storage compartment inside and an opening at the front, and an insulated door that can open and close the opening, The insulated box comprises an outer box, an inner box disposed inside the outer box, a composite insulation material disposed between the outer box and the inner box, and a heat dissipation pipe positioned in contact with the inner surface of the outer box. The composite insulation material comprises a vacuum insulation material and a foamed insulation material layer covering the vacuum insulation material. A groove is formed on the outer box side surface of the foamed insulation layer, and at least a portion of the heat dissipation pipe is housed in the groove. The outer box and the composite insulation material are bonded together with an adhesive. A refrigerator in which rigid polyurethane foam material is filled between the inner box and the composite insulation material.

2. The refrigerator according to claim 1, wherein the foamed insulation layer is made of rigid polyurethane foam.

3. The density of the aforementioned foamed insulation layer is 40 kg / m³. ３ More than 50kg / m ３ The refrigerator according to claim 2, which is within the following range.

4. The density of the aforementioned rigid polyurethane foam material is 30 kg / m³. ３ More than 35kg / m ３ A refrigerator according to claim 1 or 2, which is within the following range.

5. It comprises an outer box, an inner box disposed inside the outer box, a composite insulation material disposed between the outer box and the inner box, and a heat dissipation pipe positioned in contact with the inner surface of the outer box. The composite insulation material comprises a vacuum insulation material and a foamed insulation material layer covering the vacuum insulation material. A groove is formed on the outer box side surface of the foamed insulation layer, and at least a portion of the heat dissipation pipe is housed in the groove. The outer box and the composite insulation material are bonded together with an adhesive. A refrigerator insulated box in which rigid polyurethane foam material is filled between the inner box and the composite insulation material.

6. A step of arranging heat dissipation pipes on the inner surface of the outer box forming member, The process involves overlapping a composite insulation material, which comprises a vacuum insulation material and a foamed insulation material layer covering the vacuum insulation material, with grooves formed on one surface of the foamed insulation material layer, so that the heat dissipation pipes are housed in the grooves, and bonding the composite insulation material and the outer box forming member with an adhesive, on the inner surface of the outer box forming member, A method for manufacturing a refrigerator insulated box, comprising the steps of: arranging an inner box on the side of the composite insulation material opposite to the side to which the outer box forming member is bonded, and filling the space between the composite insulation material and the inner box with a rigid foamed urethane material.

7. The system comprises a vacuum insulation material and a foamed insulation material layer covering the vacuum insulation material. A composite insulation material for refrigerators, wherein grooves are formed on at least one surface of the foam insulation layer.

8. A step of preparing a molding die having a first mold and a second mold positioned opposite the first mold, wherein a protrusion is formed on at least one surface of the first mold and the second mold, A method for manufacturing a composite insulation material for a refrigerator, comprising the steps of: placing a vacuum insulation material between a first mold and a second mold; then injecting a foaming material between the vacuum insulation material and the first mold and between the vacuum insulation material and the second mold; foaming the foaming material to cover the vacuum insulation material with a foamed insulation material layer.

Images